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WO2017043263A1 - Gas concentration detection device - Google Patents

Gas concentration detection device Download PDF

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Publication number
WO2017043263A1
WO2017043263A1 PCT/JP2016/073874 JP2016073874W WO2017043263A1 WO 2017043263 A1 WO2017043263 A1 WO 2017043263A1 JP 2016073874 W JP2016073874 W JP 2016073874W WO 2017043263 A1 WO2017043263 A1 WO 2017043263A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas concentration
gas
housing
optical path
wind direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/073874
Other languages
French (fr)
Japanese (ja)
Inventor
雅章 安田
直輝 大串
堀内　秀哉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to CN201680051142.8A priority Critical patent/CN107923848B/en
Priority to JP2017539084A priority patent/JP6481764B2/en
Publication of WO2017043263A1 publication Critical patent/WO2017043263A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/61—Non-dispersive gas analysers

Definitions

  • the present invention relates to a gas concentration detection device.
  • Patent Document 1 JP-A-2002-350380 (Patent Document 1) is an example of a document that discloses a gas concentration detection device that can measure the concentration of a specific gas contained in a flowing measurement target gas.
  • the gas concentration detection device disclosed in Patent Document 1 includes a gas detection unit that houses a circuit board on which a gas sensor is mounted, and an introduction pipe unit that is connected to the gas detection unit.
  • the gas sensor is arranged so that the introduction pipe portion faces a connection hole connected to the gas detection portion.
  • the periphery of the gas sensor is surrounded by a cylindrical heat insulating seal rubber that communicates with the introduction pipe.
  • a non-woven fabric is provided in the vicinity of the opening portion of the heat insulating seal rubber located on the introduction tube portion side.
  • a partition plate is provided inside the introduction pipe portion.
  • the measurement target gas is divided into two by the partition plate even when the flow velocity of the measurement target gas flowing in a predetermined direction is increased in front of the introduction pipe portion. Since it is introduced, an increase in the flow velocity of the measurement target gas in the vicinity of the gas sensor can be suppressed, and a change in detection sensitivity of the gas sensor can be suppressed.
  • the wind improving flow side becomes positive pressure as viewed from the introduction pipe part
  • the wind direction downstream side becomes negative pressure as seen from the introduction pipe part.
  • one end of the partition plate in the axial direction of the introduction tube portion is located on the same plane as the opening surface passing through the tip of the introduction tube portion, and the shaft of the introduction tube portion
  • the other end of the partition plate in the direction is located inside the opening surface passing through the root of the introduction pipe.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a gas concentration detection device that can efficiently circulate a measurement target gas in a housing.
  • a gas concentration detection device based on the present invention measures a concentration of a specific gas contained in the measurement target gas by taking a flowing measurement target gas, and a gas concentration detector for measuring the concentration of the specific gas;
  • a housing for accommodating the gas concentration detector therein; and a housing protruding from the bottom of the housing to the outside, introducing the measurement object gas into the housing from the outside, and from the housing
  • a wind direction guide plate portion for leading the measurement target gas to the outside, and the housing includes an introduction hole into which the measurement target gas is introduced and a lead-out hole from which the measurement target gas is led out.
  • the introduction hole and the lead-out hole are provided at the bottom of the housing so as to sandwich the wind direction guide plate part, and the gas concentration detector is at least partially It is arranged at a predetermined distance from the bottom part of the housing so as to face the wind direction guide plate part and to face the bottom part of the housing, and between the gas concentration detector and the bottom part of the housing.
  • a partition for partitioning the formed space into the space on the introduction hole side and the space on the lead-out hole side is provided.
  • the partition portion may be provided so as to continuously extend from the wind direction guide plate portion.
  • the partition may be in contact with the gas concentration detector.
  • the gas concentration detector may have a protruding portion that protrudes toward the wind direction guide plate portion, and the partition portion includes the protruding portion. May be included.
  • the gas concentration detection device may further include a tubular member that communicates with the introduction hole and the lead-out hole and projects outward from the bottom of the housing.
  • the wind direction guide plate portion is provided so as to protrude outward from one end of the tubular member located on the opposite side to the side where the housing is located through the inside of the tubular member. It is preferable.
  • the wind direction guide plate portion may be fixed to the tubular member.
  • the tubular member is detachably connected to the housing.
  • the gas concentration detector includes an optical path member having an infrared optical path therein and a communication portion for communicating the optical path with an external space; and An infrared irradiation element installed in the optical path; and an infrared light receiving element, wherein the measurement target gas introduced into the optical path through the communication portion is irradiated with infrared rays using the infrared irradiation element, and the measurement target
  • the gas detector is a non-dispersive infrared absorption type gas concentration detector that detects the concentration of the specific gas contained in the measurement target gas by receiving infrared rays irradiated on the gas with the infrared light receiving element.
  • the gas concentration detector may further include a substrate portion on which the optical path member is mounted, and the gas concentration detector is included in the substrate portion.
  • the main surface on the side where the optical path member is not mounted may be disposed so as to face the bottom portion of the housing.
  • the gas concentration detector may further include a substrate portion on which the optical path member is mounted, and the gas concentration detector is included in the substrate portion.
  • the main surface on the side where the optical path member is mounted may be disposed so as to face the bottom portion of the housing.
  • a gas concentration detection device capable of efficiently circulating a measurement target gas in a housing.
  • FIG. 1 is an exploded perspective view of a gas concentration detection device according to Embodiment 1.
  • FIG. It is a schematic sectional drawing which shows the installation state which installed the gas concentration detection apparatus which concerns on Embodiment 1 in the duct.
  • 1 is a schematic diagram of a gas concentration detector according to Embodiment 1.
  • FIG. 2 is a circuit configuration diagram of a gas concentration detector according to Embodiment 1.
  • FIG. It is the perspective view which looked at the wind direction guide plate part and tubular member which concern on Embodiment 1 from the front end side. It is the perspective view which looked at the wind direction guide plate part and tubular member which concern on Embodiment 1 from the root side.
  • FIG. 1 is an exploded perspective view of a gas concentration detection device according to the present embodiment.
  • FIG. 2 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 1 and FIG. 2, the gas concentration detection apparatus 1 which concerns on this Embodiment is demonstrated.
  • the gas concentration detection device 1 is a device that takes in a flowing measurement target gas and measures the concentration of a specific gas contained in the measurement target gas.
  • the gas concentration detection device 1 controls the ventilation amount based on the carbon dioxide concentration in BEMS (Building Energy Management System), or controls the indoor carbon dioxide concentration within a predetermined range in a plant cultivation facility or the like. Used for.
  • the gas concentration detection device 1 includes a housing 30, a gas concentration detector 40, a tubular member 80, a wind direction guide plate portion 91, and a partition portion 92.
  • the housing 30 includes a first housing and a second housing 20.
  • the gas concentration detector 40 is accommodated inside.
  • the housing 30 is provided with an introduction port 15 into which a measurement target gas is introduced from the outside.
  • a tubular member 80 is connected to the introduction port 15.
  • the first housing 10 has a box shape in which one main surface located on the one end 10a side is opened.
  • the first housing 10 includes a bottom portion 11, a peripheral wall portion 12 connected to the periphery of the bottom portion 11, an opening portion 13, and a first engagement portion 14 that protrudes outward from the peripheral wall portion 12.
  • the second housing 20 closes the opening 13 so that it can be opened and closed.
  • the 2nd housing 20 has the main-body part 21 and the 2nd engaging part 23 provided in the said main-body part.
  • the second engaging portion 23 is detachably engaged with the first engaging portion 14 of the first housing 10. When the second engaging portion 23 engages with the first engaging portion 14, the inside of the first housing 10 is sealed with the second housing 20.
  • the gas concentration detector 40 is a non-dispersive infrared absorption method (NDIR method) gas concentration detector.
  • the gas whose concentration is detected by the gas concentration detector 40 is, for example, carbon dioxide.
  • the gas concentration detector 40 has an optical path member 44 that has an infrared optical path inside and is provided with a communication portion 46 that communicates the optical path with an external space, and a light source 50 (FIG. 3) as an infrared irradiation element installed in the optical path. And a pyroelectric sensor 54 (see FIG. 3) as an infrared light receiving element.
  • the measurement target gas introduced into the optical path via the communication portion 46 is irradiated with infrared rays using the light source 50, and the measurement target gas is irradiated.
  • the pyroelectric sensor 54 receives the emitted infrared light to detect the concentration of the specific gas included in the measurement target gas.
  • the gas concentration detector 40 further includes a circuit board 42 as a board part.
  • the circuit board 42 has a plate shape and includes a main surface 42b on the side where the optical path member 44 is mounted and a main surface 42a on the side where the optical path member 44 is not mounted.
  • the gas concentration detector 40 is arranged such that the main surface 42 a on the circuit board 42 on which the optical path member 44 is not mounted faces the bottom 11 of the first housing 10.
  • the gas concentration detector 40 is disposed at a predetermined distance from the bottom 11 of the first housing 10. A detailed configuration of the gas concentration detector 40 will be described later with reference to FIGS. 3 and 4.
  • the tubular member 80 has a cylindrical shape including one end 80a and the other end 80b.
  • the tubular member 80 connects the duct 100 and the housing 30.
  • the tubular member 80 is detachably attached to the duct 100 and is detachably attached to the housing 30.
  • the tubular member 80 may be formed integrally with the housing 30 by injection molding or the like.
  • the one end 80 a side of the tubular member 80 is connected to the through hole 101 of the duct 100.
  • One end 80 a of the tubular member 80 may protrude toward the inside of the duct 100 when connected to the duct 100.
  • the other end 80 b side of the tubular member 80 is connected to the introduction port 15 of the housing 30.
  • the tubular member 80 protrudes outward from the bottom 11 of the first housing 10 in a state where it is connected to the housing 30.
  • the other end 80 b of the tubular member 80 may protrude toward the inside of the housing 30 while being connected to the housing 30.
  • the tubular member 80 has a flange portion 81 protruding outward in the radial direction.
  • the flange portion 81 is provided on the one end 80 a side of the tubular member 80.
  • the flange portion 81 contacts the outer peripheral surface of the duct 100 in a state where the tubular member 80 is connected to the duct 100.
  • the wind direction guide plate portion 91 has, for example, a plate shape.
  • the wind direction guide plate portion 91 extends along the tube axis direction of the tubular member 80.
  • the wind direction guide plate portion 91 is provided so as to protrude from the bottom portion 11 of the first housing 10 through the inside of the tubular member 80 toward the outside rather than the one end 80 a of the tubular member 80.
  • the wind direction guide plate portion 91 is a part for introducing the measurement target gas into the housing 30 from the outside and leading out the measurement target gas from the inside of the housing 30 to the outside.
  • the tip of the wind direction guide plate portion 91 on the side protruding outward from one end 80 a of the tubular member 80 is located inside the duct 100.
  • the wind improving flow side becomes a positive pressure as viewed from the wind direction guide plate portion 91, and the wind direction as viewed from the wind direction guide plate portion 91.
  • the downstream side becomes negative pressure.
  • the wind direction guide plate portion 91 is provided so as to intersect the flow direction of the measurement target gas.
  • the wind direction guide plate portion 91 introduces the measurement target gas into the inside of the tubular member 80 and the housing 30. And a lead-out portion 83 for leading the measurement target gas to the outside of the housing 30.
  • the wind direction guide plate portion 91 divides the introduction port 15 into an introduction hole 16 through which the measurement target gas is introduced and a lead-out hole 17 through which the measurement target gas is derived.
  • the introduction hole 16 and the lead-out hole 17 are provided in the bottom part 11 of the first housing 10 (the bottom part of the housing 30) so as to sandwich the wind direction guide plate part 91 therebetween.
  • the introduction hole 16 communicates with the above-described introduction part 82
  • the lead-out hole 17 communicates with the above-described lead-out part 83.
  • the partition 92 substantially partitions the space formed between the gas concentration detector 40 and the bottom 11 of the housing 30 into a space on the introduction hole 16 side and a space on the lead-out hole 17 side.
  • the partition part 92 is provided so as to continuously extend from the wind direction guide plate part 91.
  • the partition 92 is preferably provided so as to be close to the main surface 42a of the circuit board 42, and more preferably provided so as to be in contact with the main surface 42a of the circuit board 42.
  • a part of the measurement target gas flowing on the wind improving flow side when viewed from the wind direction guide plate portion 91 is drawn into the introduction portion of the tubular member 80 by the differential pressure.
  • the measurement target gas drawn into the introduction portion of the tubular member 80 is introduced into the housing 30 through the introduction hole 16.
  • the measurement target gas introduced into the housing 30 enters the optical path member 44 through the communication portion 46 provided in the optical path member 44 when circulating in the housing 30.
  • the measurement target gas that has entered the optical path member 44 is discharged into the housing 30 through the communication portion 46.
  • the measurement target gas that has entered the optical path member 44 passes through the communication part 46 and the other communication part in the housing 30. To be released. Then, the lead is led into the duct 100 through the lead-out hole 17 and the lead-out portion 83 of the tubular member 80 in order.
  • FIG. 3 is a schematic diagram of the gas concentration detector according to the present embodiment. With reference to FIG. 3, the gas concentration detector 40 according to the present embodiment will be described.
  • the gas concentration detector 40 includes a concentration detector 60 (see FIG. 4) that performs a gas concentration detection operation, a thermistor 58 that is a temperature detector that detects the temperature of the gas, and a circuit board. 42.
  • the optical path member 44 is provided at a predetermined position on one surface of the circuit board 42.
  • the components of the concentration detector 60 and the thermistor 58 are provided at predetermined positions inside the optical path member 44.
  • the concentration detection unit 60 includes a light source 50, a pyroelectric sensor 54, and a switching device 62 that switches a plurality of types of filters.
  • the light source 50 is a filament lamp.
  • the light source 50 may be a light source that emits infrared rays, such as an LED (Light Emitting Diode), as long as it emits wavelengths including at least infrared rays.
  • the light source 50 is controlled to blink at a predetermined cycle.
  • the light source 50 is held by a holding base that is a part of the optical path member 44.
  • the light source 50 is provided at a position separated from the pyroelectric sensor 54 by a predetermined distance.
  • the light source 50 emits infrared rays toward the pyroelectric sensor 54.
  • An optical path portion 48 is formed between the light source 50 and the pyroelectric sensor 54 when the light source 50 emits infrared rays.
  • the optical path portion 48 is formed by reflecting the infrared rays emitted from the light source 50 by the inner wall surface of the optical path member 44.
  • the cross-sectional shape of the holding table is a semi-elliptical shape opened to the pyroelectric sensor 54 side.
  • the inside of the semi-elliptical shape is a mirror surface. That is, the holding table is a part of the elliptical mirror.
  • the light source 50 is provided at the focal point of the semi-elliptical shape of the holding table.
  • a part of the elliptical mirror is also formed on the optical path member 44. As shown in FIG. 3, the light source 50 and the pyroelectric sensor 54 are not facing each other but facing each other in a positional relationship shifted in the vertical direction on the paper surface of FIG.
  • the inner wall surface of the optical path member 44 is made of a highly reflective member.
  • the direction (angle) of the inner wall surface of the optical path member 44 is determined in advance so that an optical path portion 48 in which infrared rays emitted from the light source 50 are directed to the pyroelectric sensor 54 is formed. Therefore, infrared rays emitted from the light source 50 pass through the optical path portion 48 and enter the pyroelectric sensor 54, or after reflecting off the mirror surface on which the holding base is formed, pass through the optical path portion 48 and pyroelectric. Or enter the sensor 54.
  • the pyroelectric sensor 54 is a pyroelectric infrared sensor using bulk ceramics.
  • the pyroelectric sensor 54 is provided with an incident window 56, which is a portion that receives infrared rays emitted from the light source 50, facing the light source 50.
  • the switching device 62 is provided between the light source 50 and the pyroelectric sensor 54.
  • the switching device 62 uses a first bandpass filter (not shown) or a second bandpass filter (not shown) as light between the light source 50 and the pyroelectric sensor based on a control signal from a switching drive circuit 78 described later. Place on the road.
  • the switching device 62 is, for example, an actuator such as a motor, and switches between a first bandpass filter and a second bandpass filter.
  • the first band-pass filter is a filter that passes infrared light in the first wavelength band including the vicinity of 4.26 ⁇ m, which is a wavelength having a high carbon dioxide absorption rate.
  • the pyroelectric sensor 54 receives infrared rays in the first wavelength band among infrared rays emitted from the light source 50 when the first band pass filter is arranged on the optical path by the switching device 62. Then, the output value of the pyroelectric sensor 54 is converted into the concentration of carbon dioxide.
  • the second band-pass filter 66 has a wavelength band different from the first wavelength band, and an infrared ray in the second wavelength band including a wavelength (for example, 3.9 ⁇ m) having a low absorption rate of a gas whose concentration is to be detected. It is a filter that passes through.
  • the second band pass filter 66 is arranged on the optical path by the switching device 62, the pyroelectric sensor 54 receives infrared light in the second wavelength band among infrared light emitted from the light source 50.
  • the thermistor 58 is provided in the vicinity of the pyroelectric sensor 54 and is fixed to the circuit board 42. In the thermistor 58, a constant current flows when a voltage is applied from the drive circuit 70, and a voltage generated when the constant current flows is detected in the drive circuit 70 as an output voltage.
  • the optical path member 44 is provided so as to cover the components of the concentration detector 60 and the thermistor 58 and is fixed to the circuit board 42.
  • the optical path member 44 is provided with a communication portion 46 for taking in gas from the outside of the optical path member 44 and discharging gas inside the optical path member 44.
  • the communication part 46 is provided with an air filter.
  • the detection of the concentration of carbon dioxide by the gas concentration detector 40 is performed in a state where gas is taken into the optical path member 44 from the communication portion 46.
  • the pyroelectric sensor 54 When infrared rays are emitted from the light source 50 toward the pyroelectric sensor 54, the emitted infrared rays are received by the pyroelectric sensor 54.
  • the pyroelectric sensor 54 outputs a voltage in response to infrared light reception.
  • the voltage output from the pyroelectric sensor 54 varies depending on the concentration of carbon dioxide in the optical path section 48. This is because, among infrared rays radiated from the light source 50, infrared rays in the first wavelength band that pass through the first bandpass filter are absorbed by carbon dioxide on the optical path portion 48. This is because the amount of infrared rays that reach the pyroelectric sensor 54 via the one-band pass filter also changes (Lambert-Beer's law).
  • the voltage output from the pyroelectric sensor 54 does not change according to the concentration of carbon dioxide in the optical path section 48. This is because the infrared of the second wavelength band that passes through the second bandpass filter among the infrared rays radiated from the light source 50 is hardly absorbed by carbon dioxide or other gases.
  • the voltage output from the pyroelectric sensor 54 has a characteristic that changes according to the temperature. Have.
  • FIG. 4 is a circuit configuration diagram of the gas concentration detector according to the present embodiment. With reference to FIG. 4, the circuit configuration of the gas concentration detector 40 according to the present embodiment will be described.
  • the drive circuit 70 formed on the circuit board 40 includes an amplification circuit 72, an AD conversion circuit 74, a density conversion processing circuit 76, and a switching drive circuit 78.
  • the circuit configuration of the gas concentration detector 40 shown in FIG. 4 is an example, and is not limited to the circuit configuration shown in FIG.
  • the amplification circuit 72 is constituted by, for example, an amplifier, and amplifies the signal intensity of the concentration detection signal (output voltage) of the concentration detection unit 60.
  • the AD conversion circuit 74 converts the analog signal whose signal strength is amplified in the amplification circuit 72 into a digital signal.
  • a well-known technique may be used for amplification of signal intensity and conversion from an analog signal to a digital signal.
  • the concentration conversion processing circuit 76 calculates the concentration of carbon dioxide contained in the gas taken into the optical path member 44 by performing a predetermined process on the digital signal converted by the AD conversion circuit 74.
  • the density conversion processing circuit 76 is realized by, for example, a CPU (Central Processing Unit).
  • the CPU executes predetermined arithmetic processing and control processing by executing a program stored in a storage unit (not shown).
  • the CPU for example, in addition to the calculation process for calculating the concentration of carbon dioxide, the control process for turning on the light source 50, the control process for applying a voltage to the thermistor 58, and the switching device 62 are operated to operate the first bandpass filter or A control process for arranging the second band pass filter on the optical path between the light source 50 and the pyroelectric sensor 54 is executed.
  • the CPU outputs a drive command to the switching drive circuit 78 when operating the switching device 62.
  • the switching drive circuit 78 generates a control signal in accordance with the drive command received from the CPU and outputs the control signal to the switching device 62.
  • the temperature detection signal is acquired from the thermistor 58 and the output value of the pyroelectric sensor 54 is acquired.
  • Predetermined signal processing such as noise removal, amplification processing, and digital data conversion processing is executed on the acquired output value of the pyroelectric sensor 54.
  • the concentration of carbon dioxide is calculated from the thermistor temperature calculated based on the temperature detection signal from the thermistor and the output value of the pyroelectric sensor 54.
  • the gas concentration detector 40 calculates the concentration of carbon dioxide based on the output value V of the pyroelectric sensor 54 and the first and second calibration curves acquired in advance.
  • the first calibration curve shows the relationship between the concentration of carbon dioxide at a predetermined reference temperature and the value (V / V 0 ) obtained by normalizing the output value V of the pyroelectric sensor 54 with the reference output value V 0 .
  • the reference output value V 0 is an output value of the pyroelectric sensor 54 corresponding to the thermistor temperature Th when the concentration of carbon dioxide is a predetermined reference concentration (for example, 0 ppm).
  • the second calibration curve shows the relationship between the thermistor temperature Th and the reference output value V 0 at a predetermined reference concentration (for example, 0 ppm).
  • the data relating to the first calibration curve and the data relating to the second calibration curve are acquired in advance at the time of manufacturing the gas concentration detector 40 and stored in a storage medium such as a memory provided in the drive circuit 70.
  • the thermistor temperature Th is calculated, the reference output value V 0 is calculated based on the second calibration curve, and the calculated reference output value V 0 , the output value V of the pyroelectric sensor 54 and the first calibration curve are calculated.
  • the concentration of the specific gas (carbon dioxide) can be calculated.
  • Wind direction guide plate, reinforcement and partition 5 and 6 are perspective views of the wind direction guide plate portion and the tubular member according to the present embodiment as viewed from the distal end side and the root side. With reference to FIG. 5 and FIG. 6, the structure around the wind direction guide plate portion 91 and the wind direction guide plate portion 91 according to the present embodiment will be described.
  • the tip of the wind direction guide plate portion 91 protrudes outward from one end 80 a of the tubular member 80.
  • both side surface portions of the wind direction guide plate portion 91 are connected to the inner wall of the tubular member 80.
  • a portion of the wind direction guide plate portion 91 that protrudes outward from one end 80 a of the tubular member 80 is firmly fixed to the tubular member 80 by a pair of reinforcing portions 93.
  • the pair of reinforcing portions 93 are provided so as to sandwich both side portions of the wind direction guide plate portion 91.
  • the pair of reinforcing portions 93 are provided so as to protrude from the one end 80a of the tubular member 80 toward the outside.
  • Each of the pair of reinforcing portions 93 has a plate shape.
  • the pair of reinforcing portions 93 are provided so as to be substantially orthogonal to the wind direction guide plate portion 91. When viewed from the extending direction of the wind direction guide plate portion 91 (in the tube axis direction of the tubular member 80), the pair of reinforcing portions 93 and the wind direction guide plate portion 91 have an H shape.
  • the other end 80b of the tubular member 80 has an annular shape and is located on the same plane.
  • the partition portion 92 is provided so as to protrude from the opening surface of the tubular member 80 passing through the other end 80b toward the main surface 42a (not shown in FIG. 6) of the circuit board 42.
  • the partition part 92 has a plate shape.
  • the partition portion 92 is formed integrally with the wind direction guide plate portion 91, for example, by injection molding or the like.
  • the partition portion is parallel to the main surface 42a, and the portion of the other end 80b that is farthest from the main surface 42a of the circuit board 42 is the same. It is provided so as to protrude from the passing plane toward the main surface 42a.
  • FIG. 7 is a diagram illustrating a state in which the measurement target gas is introduced into the gas concentration detection apparatus according to the present embodiment and a state in which the measurement target gas is derived from the gas concentration detection apparatus.
  • FIG. 7 is a diagram obtained by calculating the flow velocity by simulation. In FIG. 7, the flow velocity decreases in the order from the region R1 to the region R5.
  • the gas to be measured introduced into the tubular member 80 has a flow velocity that decreases toward the circuit board 42 side.
  • the partition portion 92 since the partition portion 92 is provided, the measurement target gas introduced into the housing 30 through the introduction hole 16 passes through the inside of the housing 30 as indicated by an arrow AR1 in the figure. Move to go around.
  • the gas to be measured that has circulated inside the housing 30 and has reached the vicinity of the outlet hole 17 has a negative pressure on the downstream side of the air flow at the one end 80a of the tubular member 80. Therefore, as shown by an arrow AR2 in the figure, the outlet hole 17 Then, the air is taken in from the pipe, passes through the lead-out portion in the tubular member 80, and is led out to the duct 100.
  • FIG. 8 is a diagram illustrating a state in which the measurement target gas is introduced into the gas concentration detection device in the comparative example and a state in which the measurement target gas is derived from the gas concentration detection device.
  • the gas concentration detection device 1X in the comparative example is different from the gas concentration detection device 1 according to the first embodiment in that no partition is provided. Other configurations are almost the same.
  • FIG. 8 is a diagram obtained by calculating the flow velocity by simulation. In FIG. 8 as well, the flow velocity decreases in the order from the region R1 to the region R5.
  • the gas to be measured introduced into the tubular member 80 has a flow velocity that decreases toward the circuit board 42 side.
  • the space formed between the gas concentration detector 40 and the bottom 11 of the housing 30 is partitioned from the space on the introduction hole 16 side and the space on the lead-out hole 17 side.
  • the measurement target gas introduced into the housing 30 from the introduction hole 16 from going directly to the outlet hole 17 without circulating around the housing 30.
  • the time until the inside of the housing 30 is replaced with the newly introduced target gas is shortened. Therefore, the measurement target gas can be efficiently circulated in the housing.
  • FIG. 9 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 9, a gas concentration detection apparatus 1A according to the present embodiment will be described.
  • the gas concentration detection device 1A according to the present embodiment is different from the gas concentration detection device 1 according to the first embodiment in the configuration of the partition portion 92A. Other configurations are almost the same.
  • the gas concentration detector 40 has a protruding portion 49A protruding toward the wind direction guide plate portion 91, and the partition portion 92A in the present embodiment is configured by the protruding portion 49A.
  • the protrusion 49A has a plate shape. 49 A of protrusion parts are comprised by the resin member, for example. The protrusion 49A is provided on the main surface 42a of the circuit board 42 on the side where the optical path member 44 is not mounted. 49 A of protrusion parts are provided so that it may extend in the normal line direction of the main surface 42a.
  • the protrusion 49A is provided to face the wind direction guide plate 91.
  • the tip of the protrusion 49 ⁇ / b> A is preferably close to the root of the wind direction guide plate 91, and is preferably in contact with the root of the wind direction guide plate 91.
  • the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.
  • FIG. 10 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 10, the gas concentration detection apparatus 1B according to the present embodiment will be described.
  • the gas concentration detection device 1B according to the present embodiment is different from the gas concentration detection device 1 according to the first embodiment in the configuration of the partition portion 92B. Other configurations are almost the same.
  • the partition portion 92 includes a portion 95 provided so as to continuously extend from the wind direction guide plate portion 91, and a protruding portion 49 ⁇ / b> A provided in the gas concentration detector 40 and protruding toward the wind direction guide plate portion 91. It is comprised so that it may contain.
  • the protrusion 49A has a plate shape. 49 A of protrusion parts are comprised by the resin member, for example. The protrusion 49A is provided on the main surface 42a of the circuit board 42 on the side where the optical path member 44 is not mounted. 49 A of protrusion parts are provided so that it may extend in the normal line direction of the main surface 42a.
  • a portion 95 provided so as to continuously extend from the wind direction guide plate portion 91 has a configuration substantially similar to that of the partition portion 92 according to the first embodiment. In this case, it is preferable that the portion 95 provided so as to continuously extend from the wind direction guide plate portion 91 and the protruding portion 49A are close to each other, and more preferably abut.
  • the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.
  • FIG. 11 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 11, a gas concentration detection apparatus 1C according to the present embodiment will be described.
  • the gas concentration detection device 1 ⁇ / b> C according to the present embodiment has a gas concentration detector 40 accommodated in the housing 30 as compared with the gas concentration detection device 1 according to the first embodiment.
  • the direction is different.
  • Other configurations are almost the same.
  • the gas concentration detector 40 is arranged such that the main surface 42b of the circuit board 42 on which the optical path member 44 is mounted faces the bottom 11 of the first housing 10.
  • the gas concentration detector 40 is disposed so that the optical path member 44 faces the partition portion 92.
  • the partition 92 is preferably provided so as to be close to the optical path member 44, and more preferably provided so as to be in contact with the optical path member 44.
  • the gas concentration detector 40 may be arranged such that the main surface 42 b of the circuit board 42 exposed from the optical path member 44 faces the partition portion 92.
  • the partition 92 is preferably close to the main surface 42b of the circuit board 42, and preferably abuts on the main surface 42b of the circuit board 42.
  • the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.
  • FIG. 12 is a diagram showing conditions and results of a verification experiment performed to verify the effect of the present invention.
  • FIG. 12 shows calculation results obtained by simulation.
  • the gas concentration detection device according to Comparative Example 1 and Comparative Example 2 and the gas concentration detection device according to Example 1 are arranged, and the time until the inside of the housing 30 is replaced with a new measurement target gas (gas replacement time), The flow rate of the measurement target gas introduced into the housing 30 was calculated. The flow velocity of the measurement target gas was calculated at a position near the introduction hole 16.
  • the concentration of carbon dioxide in the housing 30 is set to 0 ppm, and the measurement target gas is introduced into the housing 30.
  • the flow velocity of the measurement target gas flowing in the duct 100 was 1.3 m / s, and the concentration of carbon dioxide contained in the measurement target gas was 550 ppm.
  • the time until the inside of the housing 30 is replaced with a new measurement target gas is the concentration of carbon dioxide in the measurement target gas after the measurement target gas is introduced into the housing 30.
  • the length of the wind direction guide plate portion 91 at the portion protruding from the one end 80a of the tubular member 80 into the duct 100 was set to 50 mm.
  • the length of the wind direction guide plate portion 91 that protrudes from the one end 80a of the tubular member 80 into the duct 100 is 200 mm.
  • the gas concentration detection device in Example 1 has the same configuration as the gas concentration detection device according to Embodiment 1.
  • the length of the wind direction guide plate portion 91 at the portion protruding from the one end 80a of the tubular member 80 into the duct 100 is 50 mm.
  • Comparative Example 2 the flow rate of the measurement target gas introduced into the housing 30 was 0.98 m / s, and the time for replacing the measurement target gas (gas replacement time) was 75 s. In Comparative Example 2, a better result than Comparative Example 1 was obtained. This is because the flow velocity flowing into the housing 30 is increased because the length of the wind direction guide plate portion 91 is increased.
  • Example 1 the flow rate of the measurement target gas introduced into the housing 30 was 0.80 m / s, and the time for replacing the measurement target gas (gas replacement time) was 30 s. The time for replacing the measurement target gas was short, and good results were obtained.
  • Comparative Example 1 and Comparative Example 2 are not provided with a partition, and therefore, most of the measurement target gas introduced from the introduction hole does not circulate around the housing 30 from the lead-out hole. Therefore, it can be said that the measurement target gas that circulates inside the housing 30 is small, and the time for which the measurement target gas is replaced is increased.
  • the partition portion 92 it was possible to shorten the time for the measurement target gas to be replaced without increasing the length of the wind direction guide plate portion 91. Thereby, since the length of the wind direction guide board part 91 can be shortened, it can be said that the gas concentration detection apparatus 1 can be comprised compactly.
  • the gas concentration detection device 1 in a state before installation can be made compact.
  • the gas (specific gas) whose concentration is detected by the gas concentration detector is carbon dioxide, but the gas that is the detection target is not particularly limited to carbon dioxide. Absent.
  • a gas such as carbon monoxide, CH 4, or NO x may be used.
  • the concentration detection target is a gas other than carbon dioxide
  • the first wavelength band has a wavelength corresponding to the type of gas that is the concentration detection target (that is, the absorption rate of the gas that is the concentration detection target is A wavelength band based on (high wavelength) is selected.
  • the switching device arranges the first band-pass filter or the second band-pass filter on the optical path between the light source and the pyroelectric sensor based on the control signal from the switching drive circuit.
  • the filter was switched.
  • the filter includes, on the optical path, a first wavelength band in which infrared rays are absorbed higher than other wavelength bands by a gas to be detected, and a second wavelength band in which infrared rays are absorbed less than the first wavelength band.
  • Any filter may be used as long as it is a filter that allows one of the filters to be passed through, and is not limited to one that selects two filters.
  • a Fabry-Perot filter may be disposed on the optical path between the light source and the pyroelectric sensor, and the filter may be switched electrically.
  • 1, 1A, 1B, 1C, 1X gas concentration detection device 10 1st housing, 11 bottom part, 12 peripheral wall part, 13 opening part, 14 1st engaging part, 15 inlet, 16 inlet hole, 17 outlet hole, 20 second housing, 21 body part, 23 second engaging part, 30 housing, 40 gas concentration detector, 42 circuit board, 44 optical path member, 46 communication part, 48 optical path part, 49A protruding part, 50 light source, 54 Pyroelectric sensor, 56 entrance window, 58 thermistor, 60 concentration detector, 62 switching device, 70 drive circuit, 72 amplifier circuit, 74 conversion circuit, 76 concentration conversion processing circuit, 78 switch drive circuit, 80 tubular member, 81 flange , 82 introduction part, 83 lead-out part, 91, 91A wind direction guide plate part, 92, 92A, 92B partition part, 93 reinforcement part, 00 Duct, 101 through hole, 911 a first plate-shaped portion, 912 a second plate-shaped portion.

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Abstract

A gas concentration detection device (1) is provided with a gas concentration detector (40), a housing (30), and a wind direction guide plate (91) disposed in such a manner as to protrude outward from a base section (11) of the housing (30), wherein: the housing (30) includes an inlet hole (16) and an outlet hole (17); the inlet hole (16) and the outlet hole (17) are disposed in the base section (11) of the housing in such a manner as to sandwich the wind direction guide plate (91); and the gas concentration detector (40) is disposed at a prescribed distance from the base section (11) of the housing (30) such that at least a portion thereof faces the wind direction guide plate (91) and so as to face the base section (11) of the housing. The gas concentration detection device (1) is further provided with a partition (92) that divides a space formed between the gas concentration detector (40) and the base section (11) of the housing (30) into a space at the inlet hole (16) side and a space at the outlet hole (17) side.

Description

ガス濃度検出装置Gas concentration detector

　本発明は、ガス濃度検出装置に関する。 The present invention relates to a gas concentration detection device.

　流動する測定対象ガスに含まれる特定ガスの濃度を測定可能なガス濃度検出装置が開示された文献として、たとえば特開２００２－３５０３８０号公報（特許文献１）が挙げられる。 JP-A-2002-350380 (Patent Document 1) is an example of a document that discloses a gas concentration detection device that can measure the concentration of a specific gas contained in a flowing measurement target gas.

　特許文献１に開示のガス濃度検出装置は、ガスセンサを搭載する回路基板を収容するガス検知部と、これに接続される導入管部とを備える。ガスセンサは、導入管部がガス検知部に接続される接続孔に対向するように配置される。ガス検知部内において、ガスセンサの周囲は、導入管部に連通する筒状の断熱シールゴムによって囲まれている。導入管部側に位置する断熱シールゴムの開口部近傍には、不織布が設けられている。導入管部の内部には、仕切板が設けられている。 The gas concentration detection device disclosed in Patent Document 1 includes a gas detection unit that houses a circuit board on which a gas sensor is mounted, and an introduction pipe unit that is connected to the gas detection unit. The gas sensor is arranged so that the introduction pipe portion faces a connection hole connected to the gas detection portion. In the gas detector, the periphery of the gas sensor is surrounded by a cylindrical heat insulating seal rubber that communicates with the introduction pipe. A non-woven fabric is provided in the vicinity of the opening portion of the heat insulating seal rubber located on the introduction tube portion side. A partition plate is provided inside the introduction pipe portion.

　仕切板によって導入管内を２分割することにより、所定の方向に流動する測定対象ガスの流速が導入管部の前方で速くなった場合であっても、仕切板で測定対象ガスが２分されて導入されるため、ガスセンサ近傍での測定対象ガスの流速の増加を抑制し、ガスセンサの検出感度の変化を抑制することができる。 By dividing the inside of the introduction pipe by the partition plate, the measurement target gas is divided into two by the partition plate even when the flow velocity of the measurement target gas flowing in a predetermined direction is increased in front of the introduction pipe portion. Since it is introduced, an increase in the flow velocity of the measurement target gas in the vicinity of the gas sensor can be suppressed, and a change in detection sensitivity of the gas sensor can be suppressed.

特開２００２－３５０３８０号公報JP 2002-350380 A

　所定の方向に測定対象ガスが流動する環境下に導入管部を設置した場合には、導入管部から見て風向上流側が正圧となり、導入管部から見て風向下流側が負圧となる。このように、導入管部の風向上流側と風向下流側にて差圧が生じるため、導入管部の内部を仕切板にて２分割した場合には、２分された導入管部のうち風向上流側に近い一方側から測定対象ガスが導入され、２分された導入管部のうち風向下流側に近い他方側から測定対象ガスが導出される。 When the introduction pipe part is installed in an environment in which the measurement target gas flows in a predetermined direction, the wind improving flow side becomes positive pressure as viewed from the introduction pipe part, and the wind direction downstream side becomes negative pressure as seen from the introduction pipe part. As described above, since a differential pressure is generated between the wind improving flow side and the wind direction downstream side of the introduction pipe portion, when the inside of the introduction pipe portion is divided into two by the partition plate, the wind direction of the divided introduction pipe portion is divided into two. The measurement target gas is introduced from one side close to the upstream side, and the measurement target gas is led out from the other side close to the wind direction downstream side of the bifurcated introduction pipe portion.

　特許文献１に開示のガス濃度検出装置にあっては、導入管部の軸方向における仕切板の一端は、導入管部の先端を通る開口面と同一平面上に位置し、導入管部の軸方向における仕切板の他端は、導入管の根元を通る開口面よりも内側に位置する。このため、仕切部の他端とガスセンサとの間には、相当程度広い空間が形成され、この空間を介して２分された導入管部のうちの一方側から導入された測定対象ガスの大部分が、２分された導入管部のうちの他方側に流れて込んでしまう。 In the gas concentration detection device disclosed in Patent Document 1, one end of the partition plate in the axial direction of the introduction tube portion is located on the same plane as the opening surface passing through the tip of the introduction tube portion, and the shaft of the introduction tube portion The other end of the partition plate in the direction is located inside the opening surface passing through the root of the introduction pipe. For this reason, a considerably wide space is formed between the other end of the partition part and the gas sensor, and a large amount of measurement target gas introduced from one side of the introduction pipe part divided into two through this space. The portion flows into the other side of the bisected introduction pipe portion.

　これにより、ガス検知部に導入された測定対象ガスをガス検知部内にまんべんなく周回させることが困難となり、測定対象ガスに含まれる特定ガスの正確な濃度を測定することが困難であった。 This makes it difficult to circulate the measurement target gas introduced into the gas detection unit evenly in the gas detection unit, and it is difficult to measure the exact concentration of the specific gas contained in the measurement target gas.

　本発明は、上記のような問題に鑑みてなされたものであり、本発明の目的は、ハウジング内において測定対象ガスを効率よく周回させることができるガス濃度検出装置を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a gas concentration detection device that can efficiently circulate a measurement target gas in a housing.

　本発明に基づくガス濃度検出装置は、流動する測定対象ガスを取り込んで上記測定対象ガスに含まれる特定ガスの濃度を測定するものであって、上記特定ガスの濃度を測定するガス濃度検出器と、上記ガス濃度検出器を内部に収容するハウジングと、上記ハウジングの底部から外部に向けて突出するように設けられ、外部から上記ハウジングの内部に上記測定対象ガスを導入し、かつ、上記ハウジングから外部に向けて上記測定対象ガスを導出するための風向案内板部と、を備え、上記ハウジングは、上記測定対象ガスが導入される導入孔と、上記測定対象ガスが導出される導出孔とを含み、上記導入孔および上記導出孔は、上記風向案内板部を挟み込むように上記ハウジングの底部に設けられ、上記ガス濃度検出器は、少なくとも一部が上記風向案内板部に対向するとともに、上記ハウジングの上記底部に対向するように上記ハウジングの上記底部から所定の距離を持って配置され、上記ガス濃度検出器と上記ハウジングの上記底部との間に形成される空間を、上記導入孔側の空間と上記導出孔側の空間とに仕切る仕切部が設けられている。 A gas concentration detection device based on the present invention measures a concentration of a specific gas contained in the measurement target gas by taking a flowing measurement target gas, and a gas concentration detector for measuring the concentration of the specific gas; A housing for accommodating the gas concentration detector therein; and a housing protruding from the bottom of the housing to the outside, introducing the measurement object gas into the housing from the outside, and from the housing A wind direction guide plate portion for leading the measurement target gas to the outside, and the housing includes an introduction hole into which the measurement target gas is introduced and a lead-out hole from which the measurement target gas is led out. The introduction hole and the lead-out hole are provided at the bottom of the housing so as to sandwich the wind direction guide plate part, and the gas concentration detector is at least partially It is arranged at a predetermined distance from the bottom part of the housing so as to face the wind direction guide plate part and to face the bottom part of the housing, and between the gas concentration detector and the bottom part of the housing. A partition for partitioning the formed space into the space on the introduction hole side and the space on the lead-out hole side is provided.

　上記本発明に基づくガス濃度検出装置にあっては、上記仕切部は、上記風向案内板部から連続して延在するように設けられていてもよい。 In the gas concentration detection device according to the present invention, the partition portion may be provided so as to continuously extend from the wind direction guide plate portion.

　上記本発明に基づくガス濃度検出装置にあっては、上記仕切部は、上記ガス濃度検出器に当接していてもよい。 In the gas concentration detection device according to the present invention, the partition may be in contact with the gas concentration detector.

　上記本発明に基づくガス濃度検出装置にあっては、上記ガス濃度検出器は、上記風向案内板部に向けて突出する突出部を有していてもよく、上記仕切部は、上記突出部を含んでいてもよい。 In the gas concentration detector according to the present invention, the gas concentration detector may have a protruding portion that protrudes toward the wind direction guide plate portion, and the partition portion includes the protruding portion. May be included.

　上記本発明に基づくガス濃度検出装置は、上記導入孔および上記導出孔に連通するとともに、上記ハウジングの上記底部から外部に向けて突出する管状部材をさらに備えていてもよい。この場合には、上記風向案内板部は、管状部材の内部を通じ、上記ハウジングが位置する側とは反対側に位置する上記管状部材の一端よりも外部に向けて突出するように設けられていることが好ましい。 The gas concentration detection device according to the present invention may further include a tubular member that communicates with the introduction hole and the lead-out hole and projects outward from the bottom of the housing. In this case, the wind direction guide plate portion is provided so as to protrude outward from one end of the tubular member located on the opposite side to the side where the housing is located through the inside of the tubular member. It is preferable.

　上記本発明に基づくガス濃度検出装置にあっては、上記風向案内板部は、上記管状部材に固定されていてもよい。この場合には、上記管状部材は、上記ハウジングに着脱可能に接続されることが好ましい。 In the gas concentration detection device according to the present invention, the wind direction guide plate portion may be fixed to the tubular member. In this case, it is preferable that the tubular member is detachably connected to the housing.

　上記本発明に基づくガス濃度検出装置にあっては、上記ガス濃度検出器は、内部に赤外線の光路を有するとともに上記光路と外部の空間とを連通させる連通部が設けられた光路部材と、上記光路に設置された赤外線照射素子と、赤外線受光素子と、を含み、上記連通部を介して上記光路に導入された上記測定対象ガスに上記赤外線照射素子を用いて赤外線を照射し、上記測定対象ガスに照射された赤外線を上記赤外線受光素子にて受光することにより、上記測定対象ガスに含まれる上記特定ガスの濃度を検出する非分散型赤外線吸収式のガス濃度検出器であることが好ましい。 In the gas concentration detection device according to the present invention, the gas concentration detector includes an optical path member having an infrared optical path therein and a communication portion for communicating the optical path with an external space; and An infrared irradiation element installed in the optical path; and an infrared light receiving element, wherein the measurement target gas introduced into the optical path through the communication portion is irradiated with infrared rays using the infrared irradiation element, and the measurement target It is preferable that the gas detector is a non-dispersive infrared absorption type gas concentration detector that detects the concentration of the specific gas contained in the measurement target gas by receiving infrared rays irradiated on the gas with the infrared light receiving element.

　上記本発明に基づくガス濃度検出装置にあっては、上記ガス濃度検出器は、上記光路部材が搭載されている基板部をさらに含んでいてもよく、上記ガス濃度検出器は、上記基板部における上記光路部材が搭載されていない側の主面が、上記ハウジングの上記底部に対向するように配置されていてもよい。 In the gas concentration detection device according to the present invention, the gas concentration detector may further include a substrate portion on which the optical path member is mounted, and the gas concentration detector is included in the substrate portion. The main surface on the side where the optical path member is not mounted may be disposed so as to face the bottom portion of the housing.

　上記本発明に基づくガス濃度検出装置にあっては、上記ガス濃度検出器は、上記光路部材が搭載されている基板部をさらに含んでいてもよく、上記ガス濃度検出器は、上記基板部における上記光路部材が搭載されている側の主面が、上記ハウジングの上記底部に対向するように配置されていてもよい。 In the gas concentration detection device according to the present invention, the gas concentration detector may further include a substrate portion on which the optical path member is mounted, and the gas concentration detector is included in the substrate portion. The main surface on the side where the optical path member is mounted may be disposed so as to face the bottom portion of the housing.

　本発明によれば、ハウジング内において測定対象ガスを効率よく周回させることができるガス濃度検出装置を提供することができる。 According to the present invention, it is possible to provide a gas concentration detection device capable of efficiently circulating a measurement target gas in a housing.

実施の形態１に係るガス濃度検出装置の分解斜視図である。1 is an exploded perspective view of a gas concentration detection device according to Embodiment 1. FIG. 実施の形態１に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。It is a schematic sectional drawing which shows the installation state which installed the gas concentration detection apparatus which concerns on Embodiment 1 in the duct. 実施の形態１に係るガス濃度検出器の概略図である。1 is a schematic diagram of a gas concentration detector according to Embodiment 1. FIG. 実施の形態１に係るガス濃度検出器の回路構成図である。2 is a circuit configuration diagram of a gas concentration detector according to Embodiment 1. FIG. 実施の形態１に係る風向案内板部および管状部材を先端側から見た斜視図である。It is the perspective view which looked at the wind direction guide plate part and tubular member which concern on Embodiment 1 from the front end side. 実施の形態１に係る風向案内板部および管状部材を根元側から見た斜視図である。It is the perspective view which looked at the wind direction guide plate part and tubular member which concern on Embodiment 1 from the root side. 実施の形態１に係るガス濃度検出装置に測定対象ガスが導入される様子およびガス濃度検出装置から測定対象ガスが導出される様子を示す図である。It is a figure which shows a mode that measurement object gas is introduce | transduced into the gas concentration detection apparatus which concerns on Embodiment 1, and a measurement object gas is derived | led-out from a gas concentration detection apparatus. 比較例におけるガス濃度検出装置に測定対象ガスが導入される様子およびガス濃度検出装置から測定対象ガスが導出される様子を示す図である。It is a figure which shows a mode that measurement object gas is introduced into the gas concentration detection apparatus in a comparative example, and a measurement object gas is derived | led-out from a gas concentration detection apparatus. 実施の形態２に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。It is a schematic sectional drawing which shows the installation state which installed the gas concentration detection apparatus which concerns on Embodiment 2 in the duct. 実施の形態３に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。It is a schematic sectional drawing which shows the installation state which installed the gas concentration detection apparatus which concerns on Embodiment 3 in the duct. 実施の形態４に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。It is a schematic sectional drawing which shows the installation state which installed the gas concentration detection apparatus which concerns on Embodiment 4 in the duct. 本発明の効果を検証するために行なった検証実験の条件および結果を示す図である。It is a figure which shows the conditions and result of a verification experiment performed in order to verify the effect of this invention.

　以下、本発明の実施の形態について、図を参照して詳細に説明する。なお、以下に示す実施の形態においては、同一のまたは共通する部分について図中同一の符号を付し、その説明は繰り返さない。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, the same or common parts are denoted by the same reference numerals in the drawings, and description thereof will not be repeated.

　（実施の形態１）
　（ガス濃度検出装置）
　図１は、本実施の形態に係るガス濃度検出装置の分解斜視図である。図２は、本実施の形態に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。図１および図２を参照して、本実施の形態に係るガス濃度検出装置１について説明する。 (Embodiment 1)
(Gas concentration detector)
FIG. 1 is an exploded perspective view of a gas concentration detection device according to the present embodiment. FIG. 2 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 1 and FIG. 2, the gas concentration detection apparatus 1 which concerns on this Embodiment is demonstrated.

　図１および図２に示すように、ガス濃度検出装置１は、流動する測定対象ガスを取り込んで測定対象ガスに含まれる特定ガスの濃度を測定する装置である。ガス濃度検出装置１は、たとえば、ＢＥＭＳ（Ｂｕｉｌｄｉｎｇ　Ｅｎｅｒｇｙ　Ｍａｎａｇｅｍｅｎｔ　Ｓｙｓｔｅｍ）において二酸化炭素の濃度に基づく換気量の制御や、植物の栽培施設等において屋内の二酸化炭素の濃度を所定の範囲内に収める制御等に用いられる。 As shown in FIGS. 1 and 2, the gas concentration detection device 1 is a device that takes in a flowing measurement target gas and measures the concentration of a specific gas contained in the measurement target gas. For example, the gas concentration detection device 1 controls the ventilation amount based on the carbon dioxide concentration in BEMS (Building Energy Management System), or controls the indoor carbon dioxide concentration within a predetermined range in a plant cultivation facility or the like. Used for.

　ガス濃度検出装置１は、ハウジング３０、ガス濃度検出器４０、管状部材８０、風向案内板部９１、および仕切部９２を備える。 The gas concentration detection device 1 includes a housing 30, a gas concentration detector 40, a tubular member 80, a wind direction guide plate portion 91, and a partition portion 92.

　ハウジング３０は、第１ハウジングおよび第２ハウジング２０を含む。ガス濃度検出器４０を内部に収容する。ハウジング３０には、外部から測定対象ガスが導入される導入口１５が設けられている。当該導入口１５には、管状部材８０が接続される。 The housing 30 includes a first housing and a second housing 20. The gas concentration detector 40 is accommodated inside. The housing 30 is provided with an introduction port 15 into which a measurement target gas is introduced from the outside. A tubular member 80 is connected to the introduction port 15.

　第１ハウジング１０は、一端１０ａ側に位置するひとつの主面が開口した箱形状を有する。第１ハウジング１０は、底部１１と、底部１１の周縁に接続される周壁部１２と、開口部１３と、周壁部１２から外側に向けて突出する第１の係合部１４を有する。 The first housing 10 has a box shape in which one main surface located on the one end 10a side is opened. The first housing 10 includes a bottom portion 11, a peripheral wall portion 12 connected to the periphery of the bottom portion 11, an opening portion 13, and a first engagement portion 14 that protrudes outward from the peripheral wall portion 12.

　第２ハウジング２０は、開口部１３を開閉可能に閉塞する。第２ハウジング２０は、本体部２１と、当該本体部に設けられた第２の係合部２３とを有する。 The second housing 20 closes the opening 13 so that it can be opened and closed. The 2nd housing 20 has the main-body part 21 and the 2nd engaging part 23 provided in the said main-body part.

　第２の係合部２３は、着脱自在に第１ハウジング１０の第１の係合部１４に係合する。第２の係合部２３が第１の係合部１４に係合することにより、第１ハウジング１０内が第２ハウジング２０に密閉される。 The second engaging portion 23 is detachably engaged with the first engaging portion 14 of the first housing 10. When the second engaging portion 23 engages with the first engaging portion 14, the inside of the first housing 10 is sealed with the second housing 20.

　ガス濃度検出器４０は、非分散型赤外線吸収方式（ＮＤＩＲ方式）のガス濃度検出器である。ガス濃度検出器４０による濃度の検出対象となる気体は、たとえば二酸化炭素である。 The gas concentration detector 40 is a non-dispersive infrared absorption method (NDIR method) gas concentration detector. The gas whose concentration is detected by the gas concentration detector 40 is, for example, carbon dioxide.

　ガス濃度検出器４０は、内部に赤外線の光路を有するとともに光路と外部の空間と連通させる連通部４６が設けられた光路部材４４と、光路に設置された赤外線照射素子としての光源５０（図３参照）および赤外線受光素子として焦電センサ５４（図３参照）とを備え、連通部４６を介して光路に導入された測定対象ガスに光源５０を用いて赤外線を照射し、測定対象ガスに照射された赤外線を焦電センサ５４にて受光することにより、測定対象ガスに含まれる特定ガスの濃度を検出する。 The gas concentration detector 40 has an optical path member 44 that has an infrared optical path inside and is provided with a communication portion 46 that communicates the optical path with an external space, and a light source 50 (FIG. 3) as an infrared irradiation element installed in the optical path. And a pyroelectric sensor 54 (see FIG. 3) as an infrared light receiving element. The measurement target gas introduced into the optical path via the communication portion 46 is irradiated with infrared rays using the light source 50, and the measurement target gas is irradiated. The pyroelectric sensor 54 receives the emitted infrared light to detect the concentration of the specific gas included in the measurement target gas.

　ガス濃度検出器４０は、基板部としての回路基板４２をさらに含む。回路基板４２は板状であり、光路部材４４が搭載されている側の主面４２ｂと、光路部材４４が搭載されていない側の主面４２ａとを備える。ガス濃度検出器４０は、回路基板４２における光路部材４４が搭載されていない側の主面４２ａが、第１ハウジング１０の底部１１に対向するように配置されている。ガス濃度検出器４０は、第１ハウジング１０の底部１１から所定の距離を持って配置されている。なお、ガス濃度検出器４０の詳細な構成については、図３および図４を用いて後述する。 The gas concentration detector 40 further includes a circuit board 42 as a board part. The circuit board 42 has a plate shape and includes a main surface 42b on the side where the optical path member 44 is mounted and a main surface 42a on the side where the optical path member 44 is not mounted. The gas concentration detector 40 is arranged such that the main surface 42 a on the circuit board 42 on which the optical path member 44 is not mounted faces the bottom 11 of the first housing 10. The gas concentration detector 40 is disposed at a predetermined distance from the bottom 11 of the first housing 10. A detailed configuration of the gas concentration detector 40 will be described later with reference to FIGS. 3 and 4.

　管状部材８０は、一端８０ａと他端８０ｂとを備える筒状形状を有する。管状部材８０は、ダクト１００とハウジング３０とを接続する。管状部材８０は、着脱自在にダクト１００に取り付けられるとともに、着脱自在にハウジング３０に取り付けられる。なお、管状部材８０は、射出成形等によりハウジング３０と一体に成形されていてもよい。 The tubular member 80 has a cylindrical shape including one end 80a and the other end 80b. The tubular member 80 connects the duct 100 and the housing 30. The tubular member 80 is detachably attached to the duct 100 and is detachably attached to the housing 30. The tubular member 80 may be formed integrally with the housing 30 by injection molding or the like.

　管状部材８０の一端８０ａ側は、ダクト１００の貫通孔１０１に接続される。管状部材８０の一端８０ａは、ダクト１００に接続された状態において、ダクト１００の内部に向けて突出していてもよい。 The one end 80 a side of the tubular member 80 is connected to the through hole 101 of the duct 100. One end 80 a of the tubular member 80 may protrude toward the inside of the duct 100 when connected to the duct 100.

　管状部材８０の他端８０ｂ側は、ハウジング３０の導入口１５に接続される。管状部材８０は、ハウジング３０に接続された状態において、第１ハウジング１０の底部１１から外部に向けて突出する。管状部材８０の他端８０ｂは、ハウジング３０に接続された状態において、ハウジング３０の内部に向けて突出していてもよい。 The other end 80 b side of the tubular member 80 is connected to the introduction port 15 of the housing 30. The tubular member 80 protrudes outward from the bottom 11 of the first housing 10 in a state where it is connected to the housing 30. The other end 80 b of the tubular member 80 may protrude toward the inside of the housing 30 while being connected to the housing 30.

　管状部材８０は、径方向外側に向かって突出するフランジ部８１を有する。フランジ部８１は、管状部材８０の一端８０ａ側に設けられている。フランジ部８１は、管状部材８０がダクト１００に接続された状態において、ダクト１００の外周面に当接する。 The tubular member 80 has a flange portion 81 protruding outward in the radial direction. The flange portion 81 is provided on the one end 80 a side of the tubular member 80. The flange portion 81 contacts the outer peripheral surface of the duct 100 in a state where the tubular member 80 is connected to the duct 100.

　風向案内板部９１は、たとえば、板状形状を有する。風向案内板部９１は、管状部材８０の筒軸方向に沿って延在する。風向案内板部９１は、第１ハウジング１０の底部１１から、管状部材８０の内部を通じ、管状部材８０の一端８０ａよりも外部に向けて突出するように設けられている。風向案内板部９１は、外部からハウジング３０の内部に測定対象ガスを導入し、かつ、ハウジング３０の内部から外部に向けて測定対象ガスを導出するための部位である。 The wind direction guide plate portion 91 has, for example, a plate shape. The wind direction guide plate portion 91 extends along the tube axis direction of the tubular member 80. The wind direction guide plate portion 91 is provided so as to protrude from the bottom portion 11 of the first housing 10 through the inside of the tubular member 80 toward the outside rather than the one end 80 a of the tubular member 80. The wind direction guide plate portion 91 is a part for introducing the measurement target gas into the housing 30 from the outside and leading out the measurement target gas from the inside of the housing 30 to the outside.

　風向案内板部９１における管状部材８０の一端８０ａから外部に向けて突出している側の先端は、ダクト１００の内部に位置する。 The tip of the wind direction guide plate portion 91 on the side protruding outward from one end 80 a of the tubular member 80 is located inside the duct 100.

　所定の方向に測定対象ガスが流動する環境下に、風向案内板部９１を配置した場合には、風向案内板部９１から見て風向上流側が正圧となり、風向案内板部９１から見て風向下流側が負圧となる。風向案内板部９１は、測定対象ガスの流動方向と交差するように設けられている。風向案内板部９１から見て、風向上流側と風向下流側にて差圧が生じることにより、風向案内板部９１は、管状部材８０の内部を、測定対象ガスをハウジング３０の内部に導入するための導入部８２と、測定対象ガスをハウジング３０の外部に導出するための導出部８３とに区画する。 When the wind direction guide plate portion 91 is disposed in an environment in which the measurement target gas flows in a predetermined direction, the wind improving flow side becomes a positive pressure as viewed from the wind direction guide plate portion 91, and the wind direction as viewed from the wind direction guide plate portion 91. The downstream side becomes negative pressure. The wind direction guide plate portion 91 is provided so as to intersect the flow direction of the measurement target gas. When the differential pressure is generated between the wind improving flow side and the wind direction downstream side when viewed from the wind direction guide plate portion 91, the wind direction guide plate portion 91 introduces the measurement target gas into the inside of the tubular member 80 and the housing 30. And a lead-out portion 83 for leading the measurement target gas to the outside of the housing 30.

　また、風向案内板部９１は、導入口１５を、測定対象ガスが導入される導入孔１６と、測定対象ガスが導出される導出孔１７とに区画する。導入孔１６および導出孔１７は、風向案内板部９１を挟み込むように第１ハウジング１０の底部１１（ハウジング３０の底部）に設けられる。導入孔１６は、上述の導入部８２に連通し、導出孔１７は、上述の導出部８３に連通する。 Further, the wind direction guide plate portion 91 divides the introduction port 15 into an introduction hole 16 through which the measurement target gas is introduced and a lead-out hole 17 through which the measurement target gas is derived. The introduction hole 16 and the lead-out hole 17 are provided in the bottom part 11 of the first housing 10 (the bottom part of the housing 30) so as to sandwich the wind direction guide plate part 91 therebetween. The introduction hole 16 communicates with the above-described introduction part 82, and the lead-out hole 17 communicates with the above-described lead-out part 83.

　仕切部９２は、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間を、導入孔１６側の空間と導出孔１７側の空間とに実質的に仕切る。仕切部９２は、風向案内板部９１から連続して延在するように設けられている。仕切部９２は、回路基板４２の主面４２ａに近接するように設けられることが好ましく、回路基板４２の主面４２ａに当接するように設けられることがより好ましい。 The partition 92 substantially partitions the space formed between the gas concentration detector 40 and the bottom 11 of the housing 30 into a space on the introduction hole 16 side and a space on the lead-out hole 17 side. The partition part 92 is provided so as to continuously extend from the wind direction guide plate part 91. The partition 92 is preferably provided so as to be close to the main surface 42a of the circuit board 42, and more preferably provided so as to be in contact with the main surface 42a of the circuit board 42.

　風向案内板部９１から見て風向上流側を流動する測定対象ガスの一部は、上記差圧によって管状部材８０の導入部に引き込まれる。管状部材８０の導入部に引き込まれた測定対象ガスは、導入孔１６を通ってハウジング３０内に導入される。ハウジング３０内に導入された測定対象ガスは、ハウジング３０内を周回する際に、光路部材４４に設けられた連通部４６を通って光路部材４４内に侵入する。当該光路部材４４内に侵入した測定対象ガスは、上記連通部４６を通ってハウジング３０内に放出される。なお、連通部４６以外に光路部材４４に他の連通部が設けられている場合には、光路部材４４内に侵入した測定対象ガスは、連通部４６および他の連通部を通ってハウジング３０内に放出される。そして、導出孔１７および管状部材８０の導出部８３を順に通って、ダクト１００内に導出される。 A part of the measurement target gas flowing on the wind improving flow side when viewed from the wind direction guide plate portion 91 is drawn into the introduction portion of the tubular member 80 by the differential pressure. The measurement target gas drawn into the introduction portion of the tubular member 80 is introduced into the housing 30 through the introduction hole 16. The measurement target gas introduced into the housing 30 enters the optical path member 44 through the communication portion 46 provided in the optical path member 44 when circulating in the housing 30. The measurement target gas that has entered the optical path member 44 is discharged into the housing 30 through the communication portion 46. In addition, in the case where the optical path member 44 is provided with another communication part other than the communication part 46, the measurement target gas that has entered the optical path member 44 passes through the communication part 46 and the other communication part in the housing 30. To be released. Then, the lead is led into the duct 100 through the lead-out hole 17 and the lead-out portion 83 of the tubular member 80 in order.

　（ガス濃度検出器）
　図３は、本実施の形態に係るガス濃度検出器の概略図である。図３を参照して、本実施の形態に係るガス濃度検出器４０について説明する。 (Gas concentration detector)
FIG. 3 is a schematic diagram of the gas concentration detector according to the present embodiment. With reference to FIG. 3, the gas concentration detector 40 according to the present embodiment will be described.

　図３に示すように、ガス濃度検出器４０は、ガスの濃度の検出動作を行う濃度検出部６０（図４参照）と、ガスの温度を検出する温度検出部であるサーミスタ５８と、回路基板４２とを含む。光路部材４４は、回路基板４２の一方の面上の所定の位置に設けられる。濃度検出部６０の構成部品およびサーミスタ５８は、光路部材４４の内部の所定の位置に設けられる。 As shown in FIG. 3, the gas concentration detector 40 includes a concentration detector 60 (see FIG. 4) that performs a gas concentration detection operation, a thermistor 58 that is a temperature detector that detects the temperature of the gas, and a circuit board. 42. The optical path member 44 is provided at a predetermined position on one surface of the circuit board 42. The components of the concentration detector 60 and the thermistor 58 are provided at predetermined positions inside the optical path member 44.

　濃度検出部６０は、光源５０と、焦電センサ５４と、複数種類のフィルタを切り替える切替装置６２とを含む。 The concentration detection unit 60 includes a light source 50, a pyroelectric sensor 54, and a switching device 62 that switches a plurality of types of filters.

　光源５０は、フィラメントランプである。しかしながら、光源５０は、少なくとも赤外線を含む波長を放射する光源であれば、たとえばＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）等の赤外線を放射する光源であってもよい。光源５０は、所定の周期で点滅するように制御される。光源５０は、光路部材４４の一部である保持台によって保持される。光源５０は、焦電センサ５４と所定の距離だけ離間した位置に設けられる。光源５０は、焦電センサ５４に向けて赤外線を放射する。光源５０が赤外線を放射することによって光源５０と焦電センサ５４との間には光路部４８が形成される。具体的には、光路部４８は、光路部材４４の内壁面が光源５０から放射された赤外線を反射することによって形成される。 The light source 50 is a filament lamp. However, the light source 50 may be a light source that emits infrared rays, such as an LED (Light Emitting Diode), as long as it emits wavelengths including at least infrared rays. The light source 50 is controlled to blink at a predetermined cycle. The light source 50 is held by a holding base that is a part of the optical path member 44. The light source 50 is provided at a position separated from the pyroelectric sensor 54 by a predetermined distance. The light source 50 emits infrared rays toward the pyroelectric sensor 54. An optical path portion 48 is formed between the light source 50 and the pyroelectric sensor 54 when the light source 50 emits infrared rays. Specifically, the optical path portion 48 is formed by reflecting the infrared rays emitted from the light source 50 by the inner wall surface of the optical path member 44.

　保持台の断面形状は、焦電センサ５４側に開いた半楕円形状である。半楕円形状の内側は、鏡面とされる。すなわち、保持台は、楕円ミラーの一部である。光源５０は、保持台の半楕円形状の焦点位置に設けられる。また、光路部材４４にも楕円ミラーの一部が形成される。図３に示すように、光源５０と焦電センサ５４とは対向した位置関係ではなく、図３の紙面上下方向にずれた位置関係で向き合っている。光路部材４４の内壁面は反射率の高い部材からなる。光路部材４４の内壁面は、光源５０から放射された赤外線が焦電センサ５４に向かう光路部４８が形成されるように予め向き（角度）が定められる。そのため、光源５０から放射された赤外線は、光路部４８を通過して焦電センサ５４に入射したり、あるいは、保持台の形成される鏡面を反射した後、光路部４８を通過して焦電センサ５４に入射したりする。 The cross-sectional shape of the holding table is a semi-elliptical shape opened to the pyroelectric sensor 54 side. The inside of the semi-elliptical shape is a mirror surface. That is, the holding table is a part of the elliptical mirror. The light source 50 is provided at the focal point of the semi-elliptical shape of the holding table. A part of the elliptical mirror is also formed on the optical path member 44. As shown in FIG. 3, the light source 50 and the pyroelectric sensor 54 are not facing each other but facing each other in a positional relationship shifted in the vertical direction on the paper surface of FIG. The inner wall surface of the optical path member 44 is made of a highly reflective member. The direction (angle) of the inner wall surface of the optical path member 44 is determined in advance so that an optical path portion 48 in which infrared rays emitted from the light source 50 are directed to the pyroelectric sensor 54 is formed. Therefore, infrared rays emitted from the light source 50 pass through the optical path portion 48 and enter the pyroelectric sensor 54, or after reflecting off the mirror surface on which the holding base is formed, pass through the optical path portion 48 and pyroelectric. Or enter the sensor 54.

　焦電センサ５４は、バルクセラミックスを用いた焦電型赤外線センサである。焦電センサ５４には、光源５０から放射される赤外線を受光する部分である入射窓５６が光源５０に向けて設けられている。 The pyroelectric sensor 54 is a pyroelectric infrared sensor using bulk ceramics. The pyroelectric sensor 54 is provided with an incident window 56, which is a portion that receives infrared rays emitted from the light source 50, facing the light source 50.

　切替装置６２は、光源５０と焦電センサ５４との間に設けられる。切替装置６２は、後述する切替駆動回路７８からの制御信号に基づいて第１バンドパスフィルタ（不図示）または、第２バンドパスフィルタ（不図示）を光源５０と焦電センサとの間の光路上に配置する。切替装置６２は、たとえば、モータ等のアクチュエータであって、第１バンドパスフィルタと第２バンドパスフィルタとを切り替える。 The switching device 62 is provided between the light source 50 and the pyroelectric sensor 54. The switching device 62 uses a first bandpass filter (not shown) or a second bandpass filter (not shown) as light between the light source 50 and the pyroelectric sensor based on a control signal from a switching drive circuit 78 described later. Place on the road. The switching device 62 is, for example, an actuator such as a motor, and switches between a first bandpass filter and a second bandpass filter.

　第１バンドパスフィルタは、二酸化炭素の吸収率が高い波長である、４．２６μｍの近傍を含む第１波長帯の赤外線を通過させるフィルタである。焦電センサ５４は、切替装置６２によって第１バンドパスフィルタが光路上に配置されている場合には、光源５０から放射された赤外線のうち第１波長帯の赤外線を受光する。そして、焦電センサ５４の出力値から二酸化炭素の濃度に換算する。 The first band-pass filter is a filter that passes infrared light in the first wavelength band including the vicinity of 4.26 μm, which is a wavelength having a high carbon dioxide absorption rate. The pyroelectric sensor 54 receives infrared rays in the first wavelength band among infrared rays emitted from the light source 50 when the first band pass filter is arranged on the optical path by the switching device 62. Then, the output value of the pyroelectric sensor 54 is converted into the concentration of carbon dioxide.

　第２バンドパスフィルタ６６は、第１波長帯と異なる波長帯であって、かつ、濃度の検出対象となる気体の吸収率が低い波長（たとえば、３．９μｍ）を含む第２波長帯の赤外線を通過させるフィルタである。焦電センサ５４は、切替装置６２によって第２バンドパスフィルタ６６が光路上に配置されている場合には、光源５０から放射された赤外線のうち第２波長帯の赤外線を受光する。 The second band-pass filter 66 has a wavelength band different from the first wavelength band, and an infrared ray in the second wavelength band including a wavelength (for example, 3.9 μm) having a low absorption rate of a gas whose concentration is to be detected. It is a filter that passes through. When the second band pass filter 66 is arranged on the optical path by the switching device 62, the pyroelectric sensor 54 receives infrared light in the second wavelength band among infrared light emitted from the light source 50.

　サーミスタ５８は、焦電センサ５４の近傍に設けられ、回路基板４２に固定される。サーミスタ５８においては、駆動回路７０から電圧が印加されることにより定電流が流れ、定電流が流れたときに生じる電圧が出力電圧として駆動回路７０において検出される。 The thermistor 58 is provided in the vicinity of the pyroelectric sensor 54 and is fixed to the circuit board 42. In the thermistor 58, a constant current flows when a voltage is applied from the drive circuit 70, and a voltage generated when the constant current flows is detected in the drive circuit 70 as an output voltage.

　光路部材４４は、濃度検出部６０の構成部品およびサーミスタ５８を覆うように設けられ、回路基板４２に固定される。光路部材４４には、光路部材４４の外部からガスを取り入れたり、光路部材４４の内部のガスを排出したりするための連通部４６が設けられる。連通部４６には、エアフィルタが設けられる。 The optical path member 44 is provided so as to cover the components of the concentration detector 60 and the thermistor 58 and is fixed to the circuit board 42. The optical path member 44 is provided with a communication portion 46 for taking in gas from the outside of the optical path member 44 and discharging gas inside the optical path member 44. The communication part 46 is provided with an air filter.

　ガス濃度検出器４０による二酸化炭素の濃度の検出は、連通部４６から光路部材４４の内部に気体が取り入れられた状態で行われる。光源５０から焦電センサ５４に向けて赤外線が放射されると、放射された赤外線は、焦電センサ５４において受光される。焦電センサ５４は、赤外線の受光に応じて電圧を出力する。 The detection of the concentration of carbon dioxide by the gas concentration detector 40 is performed in a state where gas is taken into the optical path member 44 from the communication portion 46. When infrared rays are emitted from the light source 50 toward the pyroelectric sensor 54, the emitted infrared rays are received by the pyroelectric sensor 54. The pyroelectric sensor 54 outputs a voltage in response to infrared light reception.

　第１バンドパスフィルタが光路上に配置されている場合、焦電センサ５４から出力される電圧は、光路部４８における二酸化炭素の濃度によって異なる。これは、光源５０から放射される赤外線のうち第１バンドパスフィルタを通過する第１波長帯の赤外線が光路部４８上の二酸化炭素により吸収されるため、二酸化炭素の濃度により、光源５０から第１バンドパスフィルタを経由して焦電センサ５４に到達する赤外線の量も変化するためである（Ｌａｍｂｅｒｔ－Ｂｅｅｒの法則）。 When the first bandpass filter is disposed on the optical path, the voltage output from the pyroelectric sensor 54 varies depending on the concentration of carbon dioxide in the optical path section 48. This is because, among infrared rays radiated from the light source 50, infrared rays in the first wavelength band that pass through the first bandpass filter are absorbed by carbon dioxide on the optical path portion 48. This is because the amount of infrared rays that reach the pyroelectric sensor 54 via the one-band pass filter also changes (Lambert-Beer's law).

　第２バンドパスフィルタが光路上に配置されている場合、焦電センサ５４から出力される電圧は、光路部４８における二酸化炭素の濃度に応じて変化することはない。これは、光源５０から放射される赤外線のうち第２バンドパスフィルタを通過する第２波長帯の赤外線が二酸化炭素やその他の気体によりほとんど吸収されないためである。 When the second bandpass filter is disposed on the optical path, the voltage output from the pyroelectric sensor 54 does not change according to the concentration of carbon dioxide in the optical path section 48. This is because the infrared of the second wavelength band that passes through the second bandpass filter among the infrared rays radiated from the light source 50 is hardly absorbed by carbon dioxide or other gases.

　一方、光路上に配置されているフィルタが第１バンドパスフィルタであるか第２バンドパスフィルタであるかに関わらず、焦電センサ５４から出力される電圧は、温度に応じて変化する特性を有する。 On the other hand, regardless of whether the filter arranged on the optical path is the first bandpass filter or the second bandpass filter, the voltage output from the pyroelectric sensor 54 has a characteristic that changes according to the temperature. Have.

　図４は、本実施の形態に係るガス濃度検出器の回路構成図である。図４を参照して、本実施の形態に係るガス濃度検出器４０の回路構成について説明する。 FIG. 4 is a circuit configuration diagram of the gas concentration detector according to the present embodiment. With reference to FIG. 4, the circuit configuration of the gas concentration detector 40 according to the present embodiment will be described.

　図４に示すように、回路基板４０に形成された駆動回路７０は、増幅回路７２と、ＡＤ変換回路７４と、濃度変換処理回路７６と、切替駆動回路７８とを含む。なお、図４に示すガス濃度検出器４０の回路構成は、一例であり、図４に示される回路構成に限定されるものではない。 As shown in FIG. 4, the drive circuit 70 formed on the circuit board 40 includes an amplification circuit 72, an AD conversion circuit 74, a density conversion processing circuit 76, and a switching drive circuit 78. The circuit configuration of the gas concentration detector 40 shown in FIG. 4 is an example, and is not limited to the circuit configuration shown in FIG.

　増幅回路７２は、たとえば、アンプ等によって構成され、濃度検出部６０の濃度検出信号（出力電圧）の信号強度を増幅する。 The amplification circuit 72 is constituted by, for example, an amplifier, and amplifies the signal intensity of the concentration detection signal (output voltage) of the concentration detection unit 60.

　ＡＤ変換回路７４は、増幅回路７２において信号強度が増幅されたアナログ信号をデジタル信号に変換する。なお、信号強度の増幅やアナログ信号からデジタル信号への変換は、周知の技術を用いればよい。 The AD conversion circuit 74 converts the analog signal whose signal strength is amplified in the amplification circuit 72 into a digital signal. A well-known technique may be used for amplification of signal intensity and conversion from an analog signal to a digital signal.

　濃度変換処理回路７６は、ＡＤ変換回路７４において変換されたデジタル信号に対して所定の処理を実施することによって光路部材４４の内部に取り入れられた気体に含まれる二酸化炭素の濃度を算出する。なお、本実施の形態において、濃度変換処理回路７６は、たとえば、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）によって実現される。 The concentration conversion processing circuit 76 calculates the concentration of carbon dioxide contained in the gas taken into the optical path member 44 by performing a predetermined process on the digital signal converted by the AD conversion circuit 74. In the present embodiment, the density conversion processing circuit 76 is realized by, for example, a CPU (Central Processing Unit).

　ＣＰＵは、図示しない記憶部に記憶されたプログラムを実行することによって、所定の演算処理や制御処理を実行する。ＣＰＵは、たとえば、二酸化炭素の濃度を算出する演算処理に加えて、光源５０を点灯させる制御処理やサーミスタ５８に電圧を印加する制御処理と、切替装置６２を動作させて第１バンドパスフィルタまたは第２バンドパスフィルタを光源５０と焦電センサ５４との間の光路上に配置する制御処理とを実行する。 The CPU executes predetermined arithmetic processing and control processing by executing a program stored in a storage unit (not shown). The CPU, for example, in addition to the calculation process for calculating the concentration of carbon dioxide, the control process for turning on the light source 50, the control process for applying a voltage to the thermistor 58, and the switching device 62 are operated to operate the first bandpass filter or A control process for arranging the second band pass filter on the optical path between the light source 50 and the pyroelectric sensor 54 is executed.

　ＣＰＵは、切替装置６２を動作させる場合に駆動指令を切替駆動回路７８に出力する。切替駆動回路７８は、ＣＰＵから受信した駆動指令に従って制御信号を生成し、切替装置６２に出力する。 The CPU outputs a drive command to the switching drive circuit 78 when operating the switching device 62. The switching drive circuit 78 generates a control signal in accordance with the drive command received from the CPU and outputs the control signal to the switching device 62.

　ガス濃度検出器４０にて特定ガス（二酸化炭素）の濃度を検出するに際して、サーミスタ５８から温度検出信号を取得するとともに、焦電センサ５４の出力値を取得する。取得された焦電センサ５４の出力値に対して、ノイズ除去、増幅処理、およびデジタルデータ変換処理といった所定の信号処理を実行する。サーミスタからの温度検出信号に基づいて算出されたサーミスタ温度と焦電センサ５４の出力値とから二酸化炭素の濃度を算出する。 When detecting the concentration of the specific gas (carbon dioxide) with the gas concentration detector 40, the temperature detection signal is acquired from the thermistor 58 and the output value of the pyroelectric sensor 54 is acquired. Predetermined signal processing such as noise removal, amplification processing, and digital data conversion processing is executed on the acquired output value of the pyroelectric sensor 54. The concentration of carbon dioxide is calculated from the thermistor temperature calculated based on the temperature detection signal from the thermistor and the output value of the pyroelectric sensor 54.

　具体的には、ガス濃度検出器４０は、焦電センサ５４の出力値Ｖと予め取得された第１検量線と第２検量線とに基づいて二酸化炭素の濃度を算出する。 Specifically, the gas concentration detector 40 calculates the concentration of carbon dioxide based on the output value V of the pyroelectric sensor 54 and the first and second calibration curves acquired in advance.

　第１検量線は、予め定められた基準温度における二酸化炭素の濃度と焦電センサ５４の出力値Ｖを基準出力値Ｖ０で規格化した値（Ｖ／Ｖ０）との関係を示す。基準出力値Ｖ０は、二酸化炭素の濃度が予め定められた基準濃度（たとえば、０ｐｐｍ）である場合における、サーミスタ温度Ｔｈに対応した焦電センサ５４の出力値である。第２検量線は、予め定められた基準濃度（たとえば、０ｐｐｍ）におけるサーミスタ温度Ｔｈと基準出力値Ｖ０との関係を示す。 The first calibration curve shows the relationship between the concentration of carbon dioxide at a predetermined reference temperature and the value (V / V 0 ) obtained by normalizing the output value V of the pyroelectric sensor 54 with the reference output value V 0 . The reference output value V 0 is an output value of the pyroelectric sensor 54 corresponding to the thermistor temperature Th when the concentration of carbon dioxide is a predetermined reference concentration (for example, 0 ppm). The second calibration curve shows the relationship between the thermistor temperature Th and the reference output value V 0 at a predetermined reference concentration (for example, 0 ppm).

　なお、第１検量線に関するデータおよび第２検量線に関するデータは、ガス濃度検出器４０の製造時において予め取得されて、駆動回路７０に設けられるメモリ等の記憶媒体に記憶される。 Note that the data relating to the first calibration curve and the data relating to the second calibration curve are acquired in advance at the time of manufacturing the gas concentration detector 40 and stored in a storage medium such as a memory provided in the drive circuit 70.

　サーミスタ温度Ｔｈを算出して、第２検量線に基づいて、基準出力値Ｖ０を算出し、算出された基準出力値Ｖ０と焦電センサ５４の出力値Ｖと第１検量線とに基づいて、特定ガス（二酸化炭素）の濃度を算出することができる。 The thermistor temperature Th is calculated, the reference output value V 0 is calculated based on the second calibration curve, and the calculated reference output value V 0 , the output value V of the pyroelectric sensor 54 and the first calibration curve are calculated. Thus, the concentration of the specific gas (carbon dioxide) can be calculated.

　（風向案内板部、補強部および仕切部）
　図５および図６は、本実施の形態に係る風向案内板部および管状部材を先端側ならびに根元側から見た斜視図である。図５および図６を参照して、本実施の形態に係る風向案内板部９１および風向案内板部９１の周囲の構成について説明する。 (Wind direction guide plate, reinforcement and partition)
5 and 6 are perspective views of the wind direction guide plate portion and the tubular member according to the present embodiment as viewed from the distal end side and the root side. With reference to FIG. 5 and FIG. 6, the structure around the wind direction guide plate portion 91 and the wind direction guide plate portion 91 according to the present embodiment will be described.

　図５に示すように、風向案内板部９１の先端は、管状部材８０の一端８０ａから外部に向けて突出している。管状部材８０内において、風向案内板部９１の両側面部は、管状部材８０の内壁に接続されている。風向案内板部９１の管状部材８０の一端８０ａから外部に向けて突出している部分は、一対の補強部９３によって強固に管状部材８０に固定されている。 As shown in FIG. 5, the tip of the wind direction guide plate portion 91 protrudes outward from one end 80 a of the tubular member 80. In the tubular member 80, both side surface portions of the wind direction guide plate portion 91 are connected to the inner wall of the tubular member 80. A portion of the wind direction guide plate portion 91 that protrudes outward from one end 80 a of the tubular member 80 is firmly fixed to the tubular member 80 by a pair of reinforcing portions 93.

　一対の補強部９３は、風向案内板部９１の両側面部を挟み込むように設けられている。一対の補強部９３は、管状部材８０の一端８０ａから外部に向けて突出するように設けられている。一対の補強部９３のそれぞれは、板状形状を有する。一対の補強部９３は、風向案内板部９１に対して略直交するように設けられている。風向案内板部９１の延在方向（管状部材８０の筒軸方向）から見た場合に、一対の補強部９３および風向案内板部９１は、Ｈ型形状を有する。 The pair of reinforcing portions 93 are provided so as to sandwich both side portions of the wind direction guide plate portion 91. The pair of reinforcing portions 93 are provided so as to protrude from the one end 80a of the tubular member 80 toward the outside. Each of the pair of reinforcing portions 93 has a plate shape. The pair of reinforcing portions 93 are provided so as to be substantially orthogonal to the wind direction guide plate portion 91. When viewed from the extending direction of the wind direction guide plate portion 91 (in the tube axis direction of the tubular member 80), the pair of reinforcing portions 93 and the wind direction guide plate portion 91 have an H shape.

　図６に示すように、管状部材８０の他端８０ｂは、円環形状を有し、同一平面上に位置する。仕切部９２は、当該他端８０ｂを通る管状部材８０の開口面から回路基板４２の主面４２ａ（図６において不図示）に向けて突出するように設けられている。仕切部９２は、板状形状を有する。仕切部９２は、たとえば射出成形等により風向案内板部９１と一体に成形されている。 As shown in FIG. 6, the other end 80b of the tubular member 80 has an annular shape and is located on the same plane. The partition portion 92 is provided so as to protrude from the opening surface of the tubular member 80 passing through the other end 80b toward the main surface 42a (not shown in FIG. 6) of the circuit board 42. The partition part 92 has a plate shape. The partition portion 92 is formed integrally with the wind direction guide plate portion 91, for example, by injection molding or the like.

　なお、管状部材８０の他端８０ｂが曲面上にある場合には、仕切部は、主面４２ａに平行であり、かつ、他端８０ｂのうち回路基板４２の主面４２ａから最も離れた部分を通過する平面から、当該主面４２ａに向けて突出するように設けられる。 When the other end 80b of the tubular member 80 is on a curved surface, the partition portion is parallel to the main surface 42a, and the portion of the other end 80b that is farthest from the main surface 42a of the circuit board 42 is the same. It is provided so as to protrude from the passing plane toward the main surface 42a.

　（測定対象ガスの流れ）
　図７は、本実施の形態に係るガス濃度検出装置に測定対象ガスが導入される様子およびガス濃度検出装置から測定対象ガスが導出される様子を示す図である。 (Measurement gas flow)
FIG. 7 is a diagram illustrating a state in which the measurement target gas is introduced into the gas concentration detection apparatus according to the present embodiment and a state in which the measurement target gas is derived from the gas concentration detection apparatus.

　図７は、シミュレーションによって流速を算出して得られた図である。図７においては、領域Ｒ１から領域Ｒ５の順に流速が遅くなっている。 FIG. 7 is a diagram obtained by calculating the flow velocity by simulation. In FIG. 7, the flow velocity decreases in the order from the region R1 to the region R5.

　管状部材８０に導入された測定対象ガスは、回路基板４２側に向かうにつれて流速が低下していく。本実施の形態においては、仕切部９２が設けられていることにより、導入孔１６を通過してハウジング３０内に導入された測定対象ガスは、図中矢印ＡＲ１に示すように、ハウジング３０内部を周回するように移動する。 The gas to be measured introduced into the tubular member 80 has a flow velocity that decreases toward the circuit board 42 side. In the present embodiment, since the partition portion 92 is provided, the measurement target gas introduced into the housing 30 through the introduction hole 16 passes through the inside of the housing 30 as indicated by an arrow AR1 in the figure. Move to go around.

　ハウジング３０内部を周回して導出孔１７近傍に到達した測定対象ガスは、管状部材８０の一端８０ａにおける送風下流側が負圧になっていることから、図中矢印ＡＲ２に示すように、導出孔１７から吸気され、管状部材８０内の導出部を通過して、ダクト１００に導出される。 The gas to be measured that has circulated inside the housing 30 and has reached the vicinity of the outlet hole 17 has a negative pressure on the downstream side of the air flow at the one end 80a of the tubular member 80. Therefore, as shown by an arrow AR2 in the figure, the outlet hole 17 Then, the air is taken in from the pipe, passes through the lead-out portion in the tubular member 80, and is led out to the duct 100.

　（比較例における測定対象ガスの流れ）
　図８は、比較例におけるガス濃度検出装置に測定対象ガスが導入される様子およびガス濃度検出装置から測定対象ガスが導出される様子を示す図である。 (Measurement gas flow in the comparative example)
FIG. 8 is a diagram illustrating a state in which the measurement target gas is introduced into the gas concentration detection device in the comparative example and a state in which the measurement target gas is derived from the gas concentration detection device.

　比較例におけるガス濃度検出装置１Ｘは、実施の形態１に係るガス濃度検出装置１と比較して仕切部が設けられていない点において相違する。その他の構成については、ほぼ同様である。 The gas concentration detection device 1X in the comparative example is different from the gas concentration detection device 1 according to the first embodiment in that no partition is provided. Other configurations are almost the same.

　図８は、シミュレーションによって流速を算出して得られた図である。図８においても、領域Ｒ１から領域Ｒ５の順に流速が遅くなっている。 FIG. 8 is a diagram obtained by calculating the flow velocity by simulation. In FIG. 8 as well, the flow velocity decreases in the order from the region R1 to the region R5.

　管状部材８０に導入された測定対象ガスは、回路基板４２側に向かうにつれて流速が低下していく。比較例においては、仕切部が設けられていないため、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間が導入孔１６側の空間と導出孔１７側の空間と仕切られていない。 The gas to be measured introduced into the tubular member 80 has a flow velocity that decreases toward the circuit board 42 side. In the comparative example, since no partition is provided, the space formed between the gas concentration detector 40 and the bottom 11 of the housing 30 is partitioned from the space on the introduction hole 16 side and the space on the lead-out hole 17 side. Not.

　このため、導入孔１６を通過してハウジング３０内に導入された測定対象ガスの大部分は、風向案内板部９１の先端側において生じる風向上流側と風向下流側との圧力差の影響を大きく受ける。 For this reason, most of the measurement target gas introduced into the housing 30 through the introduction hole 16 greatly affects the pressure difference between the wind improving flow side and the wind direction downstream side generated on the tip side of the wind direction guide plate portion 91. receive.

　導入孔１６を通過してハウジング３０内に導入された測定対象ガスの大部分は、図中矢印ＡＲ３に示すように、ハウジング３０内部を周回することなく、直接導出孔１７に向けて移動する。 Most of the measurement target gas introduced into the housing 30 through the introduction hole 16 moves directly toward the lead-out hole 17 without going around the inside of the housing 30 as indicated by an arrow AR3 in the figure.

　（比較例と比較した実施の形態の効果）
　本実施の形態のように、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間を、導入孔１６側の空間と導出孔１７側の空間とに実質的に仕切る仕切部９２を設けることにより、導入口１５近傍において、風向案内板部９１の先端側において生じる風向上流側と風向下流側との圧力差の影響を軽減することができる。 (Effect of embodiment compared with comparative example)
As in the present embodiment, a partition that substantially divides the space formed between the gas concentration detector 40 and the bottom 11 of the housing 30 into a space on the introduction hole 16 side and a space on the lead-out hole 17 side. By providing 92, in the vicinity of the introduction port 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the front end side of the wind direction guide plate portion 91.

　これにより、導入孔１６からハウジング３０内に導入された測定対象ガスが、ハウジング３０内を周回することなく、直接的に導出孔１７に向かうことを抑制できる。この結果、ハウジング３０内が新たに導入された対象ガスに置換されるまでの時間が短くなる。したがって、ハウジング内において測定対象ガスを効率よく周回させることができる。 Thereby, it is possible to suppress the measurement target gas introduced into the housing 30 from the introduction hole 16 from going directly to the outlet hole 17 without circulating around the housing 30. As a result, the time until the inside of the housing 30 is replaced with the newly introduced target gas is shortened. Therefore, the measurement target gas can be efficiently circulated in the housing.

　（実施の形態２）
　（ガス濃度検出装置）
　図９は、本実施の形態に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。図９を参照して、本実施の形態に係るガス濃度検出装置１Ａについて説明する。 (Embodiment 2)
(Gas concentration detector)
FIG. 9 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 9, a gas concentration detection apparatus 1A according to the present embodiment will be described.

　図９に示すように、本実施の形態に係るガス濃度検出装置１Ａは、実施の形態１に係るガス濃度検出装置１と比較して、仕切部９２Ａの構成が相違する。その他の構成については、ほぼ同様である。 As shown in FIG. 9, the gas concentration detection device 1A according to the present embodiment is different from the gas concentration detection device 1 according to the first embodiment in the configuration of the partition portion 92A. Other configurations are almost the same.

　ガス濃度検出器４０は、風向案内板部９１に向けて突出する突出部４９Ａを有し、本実施の形態における仕切部９２Ａは、この突出部４９Ａによって構成されている。 The gas concentration detector 40 has a protruding portion 49A protruding toward the wind direction guide plate portion 91, and the partition portion 92A in the present embodiment is configured by the protruding portion 49A.

　突出部４９Ａは、板状形状を有する。突出部４９Ａは、たとえば樹脂部材によって構成されている。突出部４９Ａは、回路基板４２の光路部材４４が搭載されていない側の主面４２ａに設けられている。突出部４９Ａは、主面４２ａの法線方向に延在するように設けられている。 The protrusion 49A has a plate shape. 49 A of protrusion parts are comprised by the resin member, for example. The protrusion 49A is provided on the main surface 42a of the circuit board 42 on the side where the optical path member 44 is not mounted. 49 A of protrusion parts are provided so that it may extend in the normal line direction of the main surface 42a.

　突出部４９Ａは、風向案内板部９１に対向するように設けられている。突出部４９Ａの先端は、風向案内板部９１の根元に近接することが好ましく、風向案内板部９１の根元に当接することが好ましい。 The protrusion 49A is provided to face the wind direction guide plate 91. The tip of the protrusion 49 </ b> A is preferably close to the root of the wind direction guide plate 91, and is preferably in contact with the root of the wind direction guide plate 91.

　このような構成を有する場合であっても、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間を、導入孔１６側の空間と導出孔１７側の空間とに実質的に仕切ることができる。これにより、導入口１５近傍において、風向案内板部９１の先端側において生じる風向上流側と風向下流側との圧力差の影響を軽減することができる。 Even in such a configuration, the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.

　このため、導入孔１６からハウジング３０内に導入された測定対象ガスが、ハウジング３０内を周回することなく直接的に導出孔１７に向かうことを抑制でき、この結果、ハウジング内において測定対象ガスを効率よく周回させることができる。 For this reason, it can suppress that the measurement object gas introduced into the housing 30 from the introduction hole 16 goes directly to the lead-out hole 17 without circulating in the housing 30, and as a result, the measurement object gas is reduced in the housing. It can be circulated efficiently.

　（実施の形態３）
　（ガス濃度検出装置）
　図１０は、本実施の形態に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。図１０を参照して、本実施の形態に係るガス濃度検出装置１Ｂについて説明する。 (Embodiment 3)
(Gas concentration detector)
FIG. 10 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 10, the gas concentration detection apparatus 1B according to the present embodiment will be described.

　図１０に示すように、本実施の形態に係るガス濃度検出装置１Ｂは、実施の形態１に係るガス濃度検出装置１と比較して、仕切部９２Ｂの構成が相違する。その他の構成については、ほぼ同様である。 As shown in FIG. 10, the gas concentration detection device 1B according to the present embodiment is different from the gas concentration detection device 1 according to the first embodiment in the configuration of the partition portion 92B. Other configurations are almost the same.

　仕切部９２は、風向案内板部９１から連続して延在するように設けられている部分９５と、ガス濃度検出器４０に設けられ、風向案内板部９１に向けて突出する突出部４９Ａとを含むように構成されている。 The partition portion 92 includes a portion 95 provided so as to continuously extend from the wind direction guide plate portion 91, and a protruding portion 49 </ b> A provided in the gas concentration detector 40 and protruding toward the wind direction guide plate portion 91. It is comprised so that it may contain.

　突出部４９Ａは、板状形状を有する。突出部４９Ａは、たとえば樹脂部材によって構成されている。突出部４９Ａは、回路基板４２の光路部材４４が搭載されていない側の主面４２ａに設けられている。突出部４９Ａは、主面４２ａの法線方向に延在するように設けられている。 The protrusion 49A has a plate shape. 49 A of protrusion parts are comprised by the resin member, for example. The protrusion 49A is provided on the main surface 42a of the circuit board 42 on the side where the optical path member 44 is not mounted. 49 A of protrusion parts are provided so that it may extend in the normal line direction of the main surface 42a.

　風向案内板部９１から連続して延在するように設けられている部分９５は、実施の形態１に係る仕切部９２とほぼ同様の構成を有する。この場合において、風向案内板部９１から連続して延在するように設けられている部分９５と、突出部４９Ａとは近接することが好ましく、当接することがより好ましい。 A portion 95 provided so as to continuously extend from the wind direction guide plate portion 91 has a configuration substantially similar to that of the partition portion 92 according to the first embodiment. In this case, it is preferable that the portion 95 provided so as to continuously extend from the wind direction guide plate portion 91 and the protruding portion 49A are close to each other, and more preferably abut.

　このような構成を有する場合であっても、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間を、導入孔１６側の空間と導出孔１７側の空間とに実質的に仕切ることができる。これにより、導入口１５近傍において、風向案内板部９１の先端側において生じる風向上流側と風向下流側との圧力差の影響を軽減することができる。 Even in such a configuration, the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.

　このため、導入孔１６からハウジング３０内に導入された測定対象ガスが、ハウジング３０内を周回することなく直接的に導出孔１７に向かうことを抑制でき、この結果、ハウジング内において測定対象ガスを効率よく周回させることができる。 For this reason, it can suppress that the measurement object gas introduced into the housing 30 from the introduction hole 16 goes directly to the lead-out hole 17 without circulating in the housing 30, and as a result, the measurement object gas is reduced in the housing. It can be circulated efficiently.

　（実施の形態４）
　（ガス濃度検出装置）
　図１１は、本実施の形態に係るガス濃度検出装置をダクトに設置した設置状態を示す概略断面図である。図１１を参照して、本実施の形態に係るガス濃度検出装置１Ｃについて説明する。 (Embodiment 4)
(Gas concentration detector)
FIG. 11 is a schematic cross-sectional view showing an installation state in which the gas concentration detection device according to the present embodiment is installed in a duct. With reference to FIG. 11, a gas concentration detection apparatus 1C according to the present embodiment will be described.

　図１１に示すように、本実施の形態に係るガス濃度検出装置１Ｃは、実施の形態１に係るガス濃度検出装置１と比較して、ハウジング３０内に収容されているガス濃度検出器４０の向きが相違する。その他の構成については、ほぼ同様である。 As shown in FIG. 11, the gas concentration detection device 1 </ b> C according to the present embodiment has a gas concentration detector 40 accommodated in the housing 30 as compared with the gas concentration detection device 1 according to the first embodiment. The direction is different. Other configurations are almost the same.

　ガス濃度検出器４０は、回路基板４２の光路部材４４が搭載されている側の主面４２ｂが、第１ハウジング１０の底部１１に対向するように配置されている。ガス濃度検出器４０は、光路部材４４が仕切部９２に対向するように配置されている。仕切部９２は、光路部材４４に近接するように設けられることが好ましく、光路部材４４に当接するように設けられることがより好ましい。 The gas concentration detector 40 is arranged such that the main surface 42b of the circuit board 42 on which the optical path member 44 is mounted faces the bottom 11 of the first housing 10. The gas concentration detector 40 is disposed so that the optical path member 44 faces the partition portion 92. The partition 92 is preferably provided so as to be close to the optical path member 44, and more preferably provided so as to be in contact with the optical path member 44.

　なお、ガス濃度検出器４０は、光路部材４４から露出する回路基板４２の主面４２ｂが仕切部９２に対向するように配置されていてもよい。この場合には、仕切部９２は、回路基板４２の主面４２ｂに近接することが好ましく、回路基板４２の主面４２ｂに当接することが好ましい。 The gas concentration detector 40 may be arranged such that the main surface 42 b of the circuit board 42 exposed from the optical path member 44 faces the partition portion 92. In this case, the partition 92 is preferably close to the main surface 42b of the circuit board 42, and preferably abuts on the main surface 42b of the circuit board 42.

　このような構成を有する場合であっても、ガス濃度検出器４０とハウジング３０の底部１１との間に形成される空間を、導入孔１６側の空間と導出孔１７側の空間とに実質的に仕切ることができる。これにより、導入口１５近傍において、風向案内板部９１の先端側において生じる風向上流側と風向下流側との圧力差の影響を軽減することができる。 Even in such a configuration, the space formed between the gas concentration detector 40 and the bottom portion 11 of the housing 30 is substantially divided into a space on the introduction hole 16 side and a space on the outlet hole 17 side. Can be partitioned. Thereby, in the vicinity of the inlet 15, it is possible to reduce the influence of the pressure difference between the wind improving flow side and the wind direction downstream side that occurs on the tip side of the wind direction guide plate portion 91.

　このため、導入孔１６からハウジング３０内に導入された測定対象ガスが、ハウジング３０内を周回することなく直接的に導出孔１７に向かうことを抑制でき、この結果、ハウジング内において測定対象ガスを効率よく周回させることができる。 For this reason, it can suppress that the measurement object gas introduced into the housing 30 from the introduction hole 16 goes directly to the lead-out hole 17 without circulating in the housing 30, and as a result, the measurement object gas is reduced in the housing. It can be circulated efficiently.

　（検証実験）
　図１２は、本発明の効果を検証するために行なった検証実験の条件および結果を示す図である。 (Verification experiment)
FIG. 12 is a diagram showing conditions and results of a verification experiment performed to verify the effect of the present invention.

　図１２は、シミュレーションによって得られた算出結果である。比較例１、比較例２におけるガス濃度検出装置および実施例１に係るガス濃度検出装置を配置して、ハウジング３０内が新たな測定対象ガスに置換されるまでの時間（ガス入替り時間）、およびハウジング３０内に導入される測定対象ガスの流速を算出した。測定対象ガスの流速は、導入孔１６近傍の位置にて算出した。 FIG. 12 shows calculation results obtained by simulation. The gas concentration detection device according to Comparative Example 1 and Comparative Example 2 and the gas concentration detection device according to Example 1 are arranged, and the time until the inside of the housing 30 is replaced with a new measurement target gas (gas replacement time), The flow rate of the measurement target gas introduced into the housing 30 was calculated. The flow velocity of the measurement target gas was calculated at a position near the introduction hole 16.

　ハウジング３０内が新たな測定対象ガスに置換されるまでの時間を測定するに際しては、ハウジング３０内における二酸化炭素の濃度を０ｐｐｍにして、このハウジング３０内に、測定対象ガスを導入した。この際、ダクト１００内を流れる測定対象ガスの流速を１．３ｍ／ｓとし、測定対象ガスに含まれる二酸化炭素の濃度を５５０ｐｐｍとした。 When measuring the time until the inside of the housing 30 is replaced with a new measurement target gas, the concentration of carbon dioxide in the housing 30 is set to 0 ppm, and the measurement target gas is introduced into the housing 30. At this time, the flow velocity of the measurement target gas flowing in the duct 100 was 1.3 m / s, and the concentration of carbon dioxide contained in the measurement target gas was 550 ppm.

　ハウジング３０内が新たな測定対象ガスに置換されるまでの時間としては、測定対象ガスがハウジング３０内に導入されてから、ハウジング３０内の二酸化炭素の濃度が測定対象ガスに含まれる二酸化炭素の濃度の９０％である４９５ｐｐｍに到達するまでの時間を算出した。 The time until the inside of the housing 30 is replaced with a new measurement target gas is the concentration of carbon dioxide in the measurement target gas after the measurement target gas is introduced into the housing 30. The time to reach 495 ppm, which is 90% of the concentration, was calculated.

　比較例１におけるガス濃度検出装置としては、実施の形態１に係るガス濃度検出装置１と比較して仕切部が設けられていないものとした。比較例１におけるガス濃度検出装置において、管状部材８０の一端８０ａからダクト１００内へ突出する部分の風向案内板部９１の長さを５０ｍｍとした。 As the gas concentration detection device in Comparative Example 1, it is assumed that no partition is provided as compared with the gas concentration detection device 1 according to Embodiment 1. In the gas concentration detection apparatus in Comparative Example 1, the length of the wind direction guide plate portion 91 at the portion protruding from the one end 80a of the tubular member 80 into the duct 100 was set to 50 mm.

　比較例２におけるガス濃度検出装置としては、実施の形態１に係るガス濃度検出装置１と比較して仕切部が設けられていないものとした。比較例１におけるガス濃度検出装置において、管状部材８０の一端８０ａからダクト１００内へ突出する部分の風向案内板部９１の長さを２００ｍｍとした。 As the gas concentration detection device in Comparative Example 2, it is assumed that no partition is provided as compared with the gas concentration detection device 1 according to Embodiment 1. In the gas concentration detection apparatus in Comparative Example 1, the length of the wind direction guide plate portion 91 that protrudes from the one end 80a of the tubular member 80 into the duct 100 is 200 mm.

　実施例１におけるガス濃度検出装置としては、実施の形態１に係るガス濃度検出装置と同様の構成を有するものとした。実施例１に係るガス濃度検出装置において、管状部材８０の一端８０ａからダクト１００内へ突出する部分の風向案内板部９１の長さを５０ｍｍとした。 The gas concentration detection device in Example 1 has the same configuration as the gas concentration detection device according to Embodiment 1. In the gas concentration detection apparatus according to the first embodiment, the length of the wind direction guide plate portion 91 at the portion protruding from the one end 80a of the tubular member 80 into the duct 100 is 50 mm.

　比較例１においては、ハウジング３０内に導入される測定対象ガスの流速は、０．８２ｍ／ｓであり、測定対象ガスが置換される時間（ガス入替り時間）は、９５ｓであった。 In Comparative Example 1, the flow rate of the measurement target gas introduced into the housing 30 was 0.82 m / s, and the time for replacing the measurement target gas (gas replacement time) was 95 seconds.

　比較例２においては、ハウジング３０内に導入される測定対象ガスの流速は、０．９８ｍ／ｓであり、測定対象ガスが置換される時間（ガス入替り時間）は、７５ｓであった。比較例２においては、比較例１よりも良好な結果が得られた。これは、風向案内板部９１の長さを長くしたため、ハウジング３０内に流れ込む流速が速くなったためである。 In Comparative Example 2, the flow rate of the measurement target gas introduced into the housing 30 was 0.98 m / s, and the time for replacing the measurement target gas (gas replacement time) was 75 s. In Comparative Example 2, a better result than Comparative Example 1 was obtained. This is because the flow velocity flowing into the housing 30 is increased because the length of the wind direction guide plate portion 91 is increased.

　実施例１においては、ハウジング３０内に導入される測定対象ガスの流速は、０．８０ｍ／ｓであり、測定対象ガスが置換される時間（ガス入替り時間）は、３０ｓであった。測定対象ガスが置換される時間が短く、良好な結果が得られた。 In Example 1, the flow rate of the measurement target gas introduced into the housing 30 was 0.80 m / s, and the time for replacing the measurement target gas (gas replacement time) was 30 s. The time for replacing the measurement target gas was short, and good results were obtained.

　以上のようなシミュレーション結果から、比較例１と比較例２とを比較して、管状部材８０の一端８０ａからダクト１００内へ突出する部分の風向案内板部９１の長さを長くすることにより、ハウジング３０内に導入される測定対象ガスの流速を速くすることが可能となることが言える。 From the simulation results as described above, by comparing the comparative example 1 and the comparative example 2, by increasing the length of the wind direction guide plate portion 91 of the portion protruding from the one end 80a of the tubular member 80 into the duct 100, It can be said that the flow velocity of the measurement target gas introduced into the housing 30 can be increased.

　比較例１および比較例２は、実施例１と比較して、仕切部が設けられていないことから、導入孔から導入された測定対象ガスの大部分がハウジング３０を周回せずに導出孔から導出されるため、ハウジング３０内部を周回する測定対象ガスが少なく、測定対象ガスが置換される時間が長くなったと言える。 Compared with Example 1, Comparative Example 1 and Comparative Example 2 are not provided with a partition, and therefore, most of the measurement target gas introduced from the introduction hole does not circulate around the housing 30 from the lead-out hole. Therefore, it can be said that the measurement target gas that circulates inside the housing 30 is small, and the time for which the measurement target gas is replaced is increased.

　以上のように、仕切部９２を設けることにより、測定対象ガスを効率よくハウジング内を周回させることができることが可能になると言える。 As described above, it can be said that by providing the partition portion 92, it is possible to efficiently circulate the measurement target gas in the housing.

　また、仕切部９２を設けることにより、風向案内板部９１の長さを長くすることなく、測定対象ガスが置換させる時間を短縮することができた。これにより、風向案内板部９１の長さを短くできるため、ガス濃度検出装置１をコンパクトに構成することができると言える。 Further, by providing the partition portion 92, it was possible to shorten the time for the measurement target gas to be replaced without increasing the length of the wind direction guide plate portion 91. Thereby, since the length of the wind direction guide board part 91 can be shortened, it can be said that the gas concentration detection apparatus 1 can be comprised compactly.

　さらに、風向案内板部９１を固定した管状部材８０を、ハウジング３０に対して着脱可能に接続できる構成とすることにより、設置前の状態におけるガス濃度検出装置１をコンパクトにすることができる。 Furthermore, by adopting a configuration in which the tubular member 80 to which the wind direction guide plate portion 91 is fixed can be detachably connected to the housing 30, the gas concentration detection device 1 in a state before installation can be made compact.

　なお、上述の実施の形態では、ガス濃度検出装置による濃度の検出対象となる気体（特定ガス）は、二酸化炭素であったが、検出対象となる気体は、二酸化炭素に特に限定されるものではない。たとえば、一酸化炭素やＣＨ４やＮＯｘ等のガスであってもよい。また、濃度検出対象が二酸化炭素以外の気体である場合には、第１波長帯は、濃度の検出対象となる気体の種類に応じた波長（すなわち、濃度の検出対象となる気体の吸収率が高い波長）を基準とした波長帯が選択される。 In the above-described embodiment, the gas (specific gas) whose concentration is detected by the gas concentration detector is carbon dioxide, but the gas that is the detection target is not particularly limited to carbon dioxide. Absent. For example, a gas such as carbon monoxide, CH 4, or NO x may be used. When the concentration detection target is a gas other than carbon dioxide, the first wavelength band has a wavelength corresponding to the type of gas that is the concentration detection target (that is, the absorption rate of the gas that is the concentration detection target is A wavelength band based on (high wavelength) is selected.

　なお、上述の実施の形態では、切替装置が切替駆動回路からの制御信号に基づいて第１バンドパスフィルタまたは第２バンドパスフィルタを光源と焦電センサとの間の光路上に配置し、機械的にフィルタの切り替えを行なっていた。フィルタは、光路上に、検出対象のガスによって他の波長帯よりも赤外線が吸収される程度が高い第１波長帯と、第１波長帯よりも赤外線が吸収される程度が低い第２波長帯とのうちのいずれか一方を選択して通過させるフィルタであればよく、２つのフィルタを選択するものに限定されるものではない。第１バンドパスフィルタおよび第２バンドパスフィルタに代えて、例えばファブリペローフィルタを光源と焦電センサとの間の光路上に配置し、電気的にフィルタの切り替えを行なってもよい。 In the above-described embodiment, the switching device arranges the first band-pass filter or the second band-pass filter on the optical path between the light source and the pyroelectric sensor based on the control signal from the switching drive circuit. The filter was switched. The filter includes, on the optical path, a first wavelength band in which infrared rays are absorbed higher than other wavelength bands by a gas to be detected, and a second wavelength band in which infrared rays are absorbed less than the first wavelength band. Any filter may be used as long as it is a filter that allows one of the filters to be passed through, and is not limited to one that selects two filters. Instead of the first bandpass filter and the second bandpass filter, for example, a Fabry-Perot filter may be disposed on the optical path between the light source and the pyroelectric sensor, and the filter may be switched electrically.

　以上、本発明の実施の形態について説明したが、今回開示された実施の形態はすべての点で例示であって制限的なものではない。本発明の範囲は請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 As mentioned above, although embodiment of this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all changes within the scope.

　１，１Ａ，１Ｂ，１Ｃ，１Ｘ　ガス濃度検出装置、１０　第１ハウジング、１１　底部、１２　周壁部、１３　開口部、１４　第１の係合部、１５　導入口、１６　導入孔、１７　導出孔、２０　第２ハウジング、２１　本体部、２３　第２の係合部、３０　ハウジング、４０　ガス濃度検出器、４２　回路基板、４４　光路部材、４６　連通部、４８　光路部、４９Ａ　突出部、５０　光源、５４　焦電センサ、５６　入射窓、５８　サーミスタ、６０　濃度検出部、６２　切替装置、７０　駆動回路、７２　増幅回路、７４　変換回路、７６　濃度変換処理回路、７８　切替駆動回路、８０　管状部材、８１　フランジ部、８２　導入部、８３　導出部、９１，９１Ａ　風向案内板部、９２，９２Ａ，９２Ｂ　仕切部、９３　補強部、１００　ダクト、１０１　貫通孔、９１１　第１板状部、９１２　第２板状部。 1, 1A, 1B, 1C, 1X gas concentration detection device, 10 1st housing, 11 bottom part, 12 peripheral wall part, 13 opening part, 14 1st engaging part, 15 inlet, 16 inlet hole, 17 outlet hole, 20 second housing, 21 body part, 23 second engaging part, 30 housing, 40 gas concentration detector, 42 circuit board, 44 optical path member, 46 communication part, 48 optical path part, 49A protruding part, 50 light source, 54 Pyroelectric sensor, 56 entrance window, 58 thermistor, 60 concentration detector, 62 switching device, 70 drive circuit, 72 amplifier circuit, 74 conversion circuit, 76 concentration conversion processing circuit, 78 switch drive circuit, 80 tubular member, 81 flange , 82 introduction part, 83 lead-out part, 91, 91A wind direction guide plate part, 92, 92A, 92B partition part, 93 reinforcement part, 00 Duct, 101 through hole, 911 a first plate-shaped portion, 912 a second plate-shaped portion.

Claims (9)

　流動する測定対象ガスを取り込んで前記測定対象ガスに含まれる特定ガスの濃度を測定するガス濃度検出装置であって、
　前記特定ガスの濃度を測定するガス濃度検出器と、
　前記ガス濃度検出器を内部に収容するハウジングと、
　前記ハウジングの底部から外部に向けて突出するように設けられ、外部から前記ハウジングの内部に前記測定対象ガスを導入し、かつ、前記ハウジングの内部から外部に向けて前記測定対象ガスを導出するための風向案内板部と、を備え、
　前記ハウジングは、前記測定対象ガスが導入される導入孔と、前記測定対象ガスが導出される導出孔とを含み、
　前記導入孔および前記導出孔は、前記風向案内板部を挟み込むように前記ハウジングの底部に設けられ、
　前記ガス濃度検出器は、少なくとも一部が前記風向案内板部に対向するとともに、前記ハウジングの前記底部に対向するように前記ハウジングの前記底部から所定の距離を持って配置され、
　前記ガス濃度検出器と前記ハウジングの前記底部との間に形成される空間を、前記導入孔側の空間と前記導出孔側の空間とに仕切る仕切部が設けられている、ガス濃度検出装置。 A gas concentration detection device that takes in a flowing measurement object gas and measures the concentration of a specific gas contained in the measurement object gas,
A gas concentration detector for measuring the concentration of the specific gas;
A housing that houses the gas concentration detector therein;
Provided so as to protrude outward from the bottom of the housing, for introducing the measurement object gas into the housing from the outside, and for deriving the measurement object gas from the inside to the outside of the housing And a wind direction guide plate part,
The housing includes an introduction hole into which the measurement target gas is introduced, and a lead-out hole from which the measurement target gas is led out,
The introduction hole and the lead-out hole are provided at the bottom of the housing so as to sandwich the wind direction guide plate part,
The gas concentration detector is disposed with a predetermined distance from the bottom portion of the housing so as to face at least a part of the wind direction guide plate portion and the bottom portion of the housing,
A gas concentration detection apparatus, comprising: a partition that partitions a space formed between the gas concentration detector and the bottom of the housing into a space on the introduction hole side and a space on the lead-out hole side. 　前記仕切部は、前記風向案内板部から連続して延在するように設けられている、請求項１に記載のガス濃度検出装置。 The gas concentration detection device according to claim 1, wherein the partition portion is provided so as to continuously extend from the wind direction guide plate portion. 　前記仕切部は、前記ガス濃度検出器に当接する、請求項２に記載のガス濃度検出装置。 The gas concentration detection device according to claim 2, wherein the partitioning portion is in contact with the gas concentration detector. 　前記ガス濃度検出器は、前記風向案内板部に向けて突出する突出部を有し、
　前記仕切部は、前記突出部を含む、請求項１から３のいずれかに記載のガス濃度検出装置。 The gas concentration detector has a protrusion that protrudes toward the wind direction guide plate,
The gas concentration detection device according to claim 1, wherein the partition portion includes the protruding portion. 　前記導入孔および前記導出孔に連通するとともに、前記ハウジングの前記底部から外部に向けて突出する管状部材をさらに備え、
　前記風向案内板部は、前記管状部材の内部を通じ、前記ハウジングが位置する側とは反対側に位置する前記管状部材の一端よりも外部に向けて突出するように設けられている、請求項１から４のいずれか１項に記載のガス濃度検出装置。 A tubular member communicating with the introduction hole and the lead-out hole and protruding outward from the bottom of the housing;
The said wind direction guide plate part is provided so that it may protrude outside rather than the end of the said tubular member located in the opposite side to the side in which the said housing is located through the inside of the said tubular member. 5. The gas concentration detection device according to any one of items 1 to 4. 　前記風向案内板部は、前記管状部材に固定され、
　前記管状部材は、前記ハウジングに着脱可能に接続される、請求項５に記載のガス濃度検出装置。 The wind direction guide plate portion is fixed to the tubular member,
The gas concentration detection device according to claim 5, wherein the tubular member is detachably connected to the housing. 　前記ガス濃度検出器は、内部に赤外線の光路を有するとともに前記光路と外部の空間とを連通させる連通部が設けられた光路部材と、前記光路に設置された赤外線照射素子と、赤外線受光素子と、を含み、前記連通部を介して前記光路に導入された前記測定対象ガスに前記赤外線照射素子を用いて赤外線を照射し、前記測定対象ガスに照射された赤外線を前記赤外線受光素子にて受光することにより、前記測定対象ガスに含まれる前記特定ガスの濃度を検出する非分散型赤外線吸収式のガス濃度検出器である、請求項１から６のいずれか１項に記載のガス濃度検出装置。 The gas concentration detector includes an optical path member having an infrared optical path inside and provided with a communication portion that communicates the optical path with an external space, an infrared irradiation element installed in the optical path, and an infrared light receiving element. Irradiating the measurement target gas introduced into the optical path through the communication portion with infrared rays using the infrared irradiation element, and receiving the infrared rays irradiated on the measurement target gas with the infrared light receiving element. The gas concentration detection device according to claim 1, wherein the gas concentration detection device is a non-dispersive infrared absorption type gas concentration detector that detects a concentration of the specific gas contained in the measurement target gas. . 　前記ガス濃度検出器は、前記光路部材が搭載されている基板部をさらに含み、
　前記ガス濃度検出器は、前記基板部における前記光路部材が搭載されていない側の主面が、前記ハウジングの前記底部に対向するように配置されている、請求項７に記載のガス濃度検出装置。 The gas concentration detector further includes a substrate portion on which the optical path member is mounted,
The gas concentration detector according to claim 7, wherein the gas concentration detector is disposed such that a main surface of the substrate portion on which the optical path member is not mounted is opposed to the bottom portion of the housing. . 　前記ガス濃度検出器は、前記光路部材が搭載されている基板部をさらに含み、
　前記ガス濃度検出器は、前記基板部における前記光路部材が搭載されている側の主面が、前記ハウジングの前記底部に対向するように配置されている、請求項７に記載のガス濃度検出装置。 The gas concentration detector further includes a substrate portion on which the optical path member is mounted,
The gas concentration detector according to claim 7, wherein the gas concentration detector is disposed such that a main surface of the substrate portion on which the optical path member is mounted is opposed to the bottom portion of the housing. .
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