JP2003161698A - Device of adjusting sensitivity of floating dust detector and method for adjusting sensitivity using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device of adjusting sensitivity of a floating dust detector employed in a relatively small-sized circulation tank, which can adjust the sensitivity with a little variation without exchanging a density detecting means for the maintenance over a long period, and to provide a method for adjusting sensitivity using the device. <P>SOLUTION: The device of adjusting sensitivity of floating dust detector 1 carries out adjusting the sensitivity of a photoelectric smoke detector 7 having a means for generating floating particle 3 which is disposed in the circulation tank 2 and a density detecting means which detects the density of floating particles inside the circulation tank 2. The density detecting means is composed of a first density detecting means 4 which carries out controlling generation so that the concentration of the floating particles generated by the means for generating floating particle 3 is kept to a prescribed value of the floating particle density, and a second density detecting means 5 which is used for adjusting the sensitivity and arranged in a channel for transmitting floating particle A heading toward the photoelectric smoke detector 7 being an object to be adjusted inside the circulation tank 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to adjusting the sensitivity of a suspended dust detector provided with a means for producing suspended particles provided in a circulating tank and a means for detecting the concentration of suspended particles in the circulating tank. The present invention relates to a floating dust detector sensitivity adjusting device and a sensitivity adjusting method using the same.

[0002]

2. Description of the Related Art As a floating dust detector sensitivity adjusting device as described above, as shown in FIG. 6, a photoelectric type device for producing an oil mist 102 as a floating particle producing device and an analog voltage output as a concentration detecting device has been conventionally used. Smoke detector 103
There is a smoke sensor sensitivity adjustment device 100 that includes and.

The smoke sensor sensitivity adjusting device 100 is installed in a manufacturing process of a photoelectric or ion type smoke detector used in an automatic fire alarm system, and is provided in a substantially closed circulation tank 101. At the oil mist generator 10
In order to make the concentration of the paraffin mist generated from 2 uniform, the oil mist generator 102, the fan, etc. are set on the basis of the output signal from the photoelectric smoke detector 103 corresponding to the concentration detection means, which is the concentration detection result. Air flow generating unit 10
4 and 4 are sequentially controlled. Then, the smoke sensor 106 that is the work (adjustment target) is installed in the circulation tank 101.
It is mounted at a predetermined position in the tank from the work mounting portion 105 on the upper part, and sensitivity adjustment or sensitivity inspection for operating the smoke detector 106 is performed.

By the way, in the smoke sensor sensitivity adjusting device as described above, according to the original standard based on the specifications of the fire-fighting test facility, the suspended particulate generating means is heated to detect the suspended particulate concentration while heating the tape-shaped paper. It is preferable to use an extinction ratio densitometer as the concentration detecting means. However, with such a configuration, it is difficult to continuously generate smoke, that is, suspended particulates for a long time, and the detection distance is limited by the circulation tank 10 due to the performance of the extinction ratio densitometer.
Compared with a width of 300 mm, the required detection distance is 50
While it is 0 mm, in the case of the above configuration,
The circulation tank can be made relatively small, and further, the light emitted by the dimming rate densitometer does not approach the test work,
It does not affect the sensitivity adjustment result of the smoke sensor 106.

[0005]

However, in the case of the above-mentioned conventional technique, the photoelectric smoke detector 103, which is used as a substitute for the extinction ratio densitometer and has an analog voltage output, is installed in the circulation tank. The smoke sensor 10 cannot be accurately detected when the dirt becomes terrible due to the adhesion of oil mist after a long period of use.
There was a concern that the variation in the sensitivity adjustment value of 6 would increase. For this reason, in order to accurately adjust the sensitivity of the smoke sensor 106, maintenance of the concentration detecting means is replaced at regular intervals. Further, since the photoelectric smoke detector 103 is arranged so as to project inside the circulation tank 101, turbulence of the air flow occurs inside. Therefore,
There is a problem that it is relatively difficult to detect the density equivalent to that of the work because the installation position of the density detecting means is restricted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a small variation in a relatively small circulation tank without maintenance replacement of the concentration detecting means for a long period of time. An object of the present invention is to provide a floating dust detector sensitivity adjusting device capable of sensitivity adjustment and a sensitivity adjusting method using the same.

[0007]

In order to achieve the above object, in a floating dust detector sensitivity adjusting device of the present invention,
A floating dust detector sensitivity adjustment device for adjusting the sensitivity of a floating dust detector, comprising: a suspended particle generation means provided in a circulation tank; and a concentration detection means for detecting the concentration of floating particles in the circulation tank. As the concentration detecting means, the generation control is performed so that the suspended particles produced by the suspended particle producing means have a predetermined suspended particle concentration.
And a second concentration detector for sensitivity adjustment, which is arranged in the passage of suspended particulates to the suspended dust detector to be adjusted in the circulation tank. .

With this structure, the concentration of suspended particulates in the circulation tank is detected by the first concentration detector so that the suspended particulates generated by the suspended particulates generating means provided in the circulation tank have a predetermined suspended particulate concentration. The concentration of the suspended particulates is detected by the second concentration detector for sensitivity adjustment, which is disposed in the suspended particulates passage to the suspended dust detector to be adjusted and whose generation is controlled, and the sensitivity of the suspended dust detector is detected. Adjusted.

Then, the second concentration detector is made to project from a light projecting section which emits a beam of light having a predetermined width and which is arranged so as to be substantially orthogonal to the suspended particle passing path, and is incident from the light projecting section. It is preferable to provide an optical length measurement sensor device having a light-shielding width of the light-shielding body and a light-receiving unit that outputs an analog signal corresponding to the light-shielding width. In this case, the optical length measuring sensor device serving as the second density detector for sensitivity adjustment is formed by a light projecting unit that emits a beam of light having a predetermined width and a light shield for the light incident from the light projecting unit. The light-receiving part that outputs an analog signal corresponding to the light-shielding width is arranged so as to be substantially orthogonal to the passage of suspended particulates to the suspended dust detector to be adjusted, and the concentration of suspended particulates is detected. The sensitivity of the detector is adjusted.

Also, in the sensitivity adjusting method using the floating dust detector sensitivity adjusting device of the present invention, the concentration value of the suspended particulates inside the circulation tank is adjusted in correspondence with the output value of the second concentration detector. It is characterized in that the correction is performed and the sensitivity for operating the floating dust detector is adjusted for the corrected corrected concentration value.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 to FIG. 5 show an embodiment corresponding to all claims 1 to 3 of the present invention.
FIG. 2 is a schematic configuration diagram showing a floating dust detector sensitivity adjusting apparatus according to an embodiment of the present invention. FIG. 2 is a first concentration detector of concentration detecting means used in the floating dust detector sensitivity adjusting apparatus, and a second concentration detector. FIG. 3 is another explanatory view showing the second concentration detector used in the floating dust detector sensitivity adjusting device, and FIG. 4 is showing the floating dust detector sensitivity adjusting device. FIG. 5 is an explanatory diagram showing the operation of the second concentration detector used, and FIG. 5 is an explanatory diagram of a sensitivity adjusting method using the floating dust detector sensitivity adjusting device.

The floating dust detector sensitivity adjusting apparatus of this embodiment is provided with a suspended particle generating means 3 provided in the circulation tank 2.
And a floating dust detector sensitivity adjusting device 1 for adjusting the sensitivity of a photoelectric smoke detector (floating dust detector) 7 having a concentration detecting means for detecting the concentration of suspended particulates inside the circulation tank 2. As the concentration detecting means, a first concentration detector 4 for controlling the generation of the suspended particles by the suspended particle generating means 3 so that the suspended particles have a predetermined suspended particle concentration.
And a second concentration detector 5 for sensitivity adjustment, which is arranged in the suspended particle passage A to the photoelectric smoke detector 7 to be adjusted in the circulation tank 2.

Further, in the suspended dust detector sensitivity adjusting apparatus 1 of the embodiment, the second concentration detector 5 has a predetermined width which is arranged so as to be substantially orthogonal to the suspended particle passing path A. As an optical length measuring sensor device 5 having a light projecting section 51 for emitting the beam light B and a light receiving section 52 for outputting an analog signal corresponding to the light blocking width of the light entering from the light projecting section 51 by the light blocking member. There is also.

More specifically, this floating dust detector sensitivity adjusting device 1 is used in the manufacturing process of the photoelectric smoke detector 7 which is one of the floating dust detectors described in the section of the prior art. Sensitivity adjustment is performed by the circulation tank 2, the suspended particle generation means 3, the photoelectric smoke sensor 4 which is the first concentration detector of the concentration detection means, and the photoelectric type which is the adjustment target inside the circulation tank 2. An optical length measuring sensor device 5 serving as a second concentration detector for sensitivity adjustment, which is disposed in the passage A for passing suspended particles to the smoke sensor 7, and a blower or the like for generating a circulating air flow in the tank. The air flow generation means 6 formed is provided. The floating dust detector sensitivity adjusting device 1 of the present invention is not limited to the device for adjusting the sensitivity of the photoelectric smoke detector 7 or performing the sensitivity inspection, and is also a floating dust detecting device mounted on an air cleaner or the like, and an atmospheric air. It can also be applied to a device that performs sensitivity adjustment or sensitivity inspection, such as a dust meter that measures the amount of suspended dust inside.

In the circulation tank 2, a curved portion 22 having a plurality of semi-circularly curved straightening projections 23 of a predetermined height for straightening the circulating air flow inside an outer case 21 made of FRP material, wood material or the like. , 22 on both sides, and the curved portion 2
The photoelectric smoke sensor 7 of the inspection work is provided on the upper intermediate portion of the connecting portion 24 of the Nos. 2 and 22, and the generation of the suspended particles by the suspended particle generating means 3 described later is controlled so as to have a predetermined suspended particle concentration. A smoke sensor 4 and an optical length measuring sensor device 5 for sensitivity adjustment are provided, and a suspended particle producing means 3 and an air flow producing means 6 are provided in the lower middle portion. A stirring protrusion 25 is provided on the inner surface of the connecting portion 24 between the curved portion 22 at the upper middle portion and the photoelectric smoke detector 7 so as to appropriately agitate the circulating air flow to make the concentration of suspended particulates more uniform. Further, an opening / closing lid 26 for disposing the photoelectric smoke detector 7 inside the circulation tank 2 is arranged on the upper surface of the intermediate upper part.

In this case, the suspended particulate generation means 3 is the oil mist generator described in the section of the prior art, and outputs a fixed amount of paraffin oil supplied from the oil supply section from the photoelectric smoke detector 4. It is electrically heated by a heating heater that is controlled to a predetermined temperature based on the signal, and its generation is controlled so that the concentration of suspended particulates by the paraffin mist becomes substantially constant. That is, when the photoelectric smoke detector 7 of the inspection work is installed inside the circulation tank 2, the paraffin mist that flows out to the outside of the tank or slightly adheres inside the circulation tank 2 and decreases is detected by the photoelectric smoke sensor for control. The heater is controlled so that the paraffin mist concentration inside the circulation tank 2 becomes uniform by appropriately replenishing it based on the output signal from the vessel 4. In addition to the oil mist generating device, the suspended particle generating means 3 may be a device that heats a tape-shaped paper or the like to generate smoke.

The photoelectric smoke detector 4 is a first concentration detector for controlling the production of the suspended particulates in the circulation tank 2 by the suspended particulate producing means 3 so that the suspended particulates have a predetermined suspended particulate concentration. As shown in FIG. 2, the power source of the heating heater provided in the oil mist generator, which is provided substantially directly below the photoelectric smoke detector 7 serving as the inspection work,
It is designed to be controlled by the output of the photoelectric smoke detector 4. The photoelectric smoke detector 4 is of a well-known analog output type, and has a DC voltage of 1 to 5 V corresponding to the concentration of suspended particulates in a predetermined range measured by the smoke detector (sensor head). Is output.

The optical length measuring sensor device 5 is a concentration detecting means for sensitivity adjustment, and in this case, it is arranged in the suspended particle passage A to the photoelectric smoke sensor 7 to be adjusted in the circulation tank 2. Then, the paraffin mist concentration in the circulation tank 2 is detected. As shown in FIG. 3, the optical length measuring sensor device 5 emits a laser beam light B of single-wavelength infrared light having a wavelength of 780 nm and a width of 15 mm in the vertical direction.
It is provided with a light projecting section 51 which emits light from the light receiving section 52 and which receives the laser beam light B from an entrance window (not shown).

The light projecting portion 51 and the light receiving portion 52 are located substantially in front of the photoelectric smoke detector 7 in the suspended particle passage A (see FIG. 2) through the transparent windows 53, 53 made of a transparent acrylic resin plate or the like. Then, a predetermined outside surface of the circulation tank 2 is set so that the laser beam light B inside the circulation tank is substantially orthogonal to the passage A at a position in front of the smoke detection portion provided below the photoelectric smoke detector 7. It is stuck in position. In many cases, the light used to detect smoke in the photoelectric smoke detector 7 is limited to a wavelength in the infrared region (about 950 nm),
By using the laser beam light B of the infrared light which is out of the range in the optical length measuring sensor device 5, the influence on the adjustment of the photoelectric smoke sensor 7 can be reduced. That is, since the laser beam B has a single wavelength of visible light and has a beam shape, even if the light projecting unit 51 and the light receiving unit 52 are arranged close to the photoelectric smoke detector 7, the photoelectric smoke detector 7 is arranged. Does not affect the detection performance of.

In the case of this optical length measuring sensor device 5, FIG.
As shown in FIG. 5, a voltage signal of 5 V is generated when the laser beam B is fully incident on a light receiving window (not shown) provided in the light receiving unit 52, and a voltage signal of 1 V is received when the light is completely blocked.
Then, an analog signal output corresponding to the length of the light-shielding object is output. Therefore, the light projecting section 51 and the light receiving section 5
When floating particles are present between 2 and 1, a voltage signal of 1 V or more is output corresponding to the concentration of the floating particles.

In the above floating dust detector sensitivity adjusting device 1, first, power is supplied to the heater of the oil mist generating device and the fan of the blower that serves as the air flow generating means 6 to generate paraffin mist. And the circulation tank 2
The oil mist generator and the air flow generator 6 are provided so that the concentration of paraffin mist in the circulating air flow having a predetermined flow velocity, that is, the concentration detection result when the output voltage of the photoelectric smoke detector 4 is a predetermined value is constant. Is controlled. Then, when the concentration detection result becomes constant, the opening / closing lid 26
The photoelectric smoke sensor 7 of the inspection work installed from the position is adjusted by detecting the concentration of suspended particulates by the optical length measuring sensor device 5 for sensitivity adjustment without changing the air flow in the circulation tank 2. .

That is, in the method for adjusting the sensitivity of the suspended dust detector of the present invention, the suspended particles in the circulation tank 2 are made to correspond to the output value of the optical length measuring sensor device 5 serving as the second concentration detector. The density value is corrected, and the sensitivity at which the photoelectric smoke detector 7 operates is adjusted for the corrected corrected density value.

Specifically, inside the circulation tank 2 whose concentration is controlled by the photoelectric smoke detector 4 for controlling the generation of suspended particles, photoelectric smoke is passed through the suspended particle passage A as shown in FIG. A slight error is detected immediately before the detector 4 (A1) and immediately before the photoelectric smoke detector 7 of the work (A2), and this error is detected as shown in FIG. % / M) and the output voltage (unit: V) are reflected in the conversion formula for sensitivity adjustment that defines the sensitivity of the photoelectric smoke detector 7.

As a result, in the conventional sensitivity adjusting method, as shown in FIG. 5 (b), when there is a variation in the concentration of suspended particulates in the range indicated by diagonal lines in the sensitivity adjusting conversion formula L1, for example, Even if adjustment is made to operate at the target airborne dust concentration of 10% / m, 8.
While an adjustment variation S of about 3 (P1) to 12.2 (P2)% / m occurs, according to the sensitivity adjustment method of the present invention,
As shown in FIG. 5 (a), even when there is an error with respect to the target airborne dust concentration of 10% / m, the optical conversion sensor L1 becomes the adjustment conversion formula L1 which is the target output sensitivity. Substituting the airborne dust concentration obtained by the device 5 to match the substantially true value thereof, 8.3% / m (P3) or 12.
Adjustment is performed so that the output voltage is 1.9 V or 3.6 V with a floating particle concentration of 2% / m (P4).
As a result, the sensitivity can be adjusted with a small variation.

Therefore, according to the floating dust detector sensitivity adjusting device 1 and the sensitivity adjusting method using the same, the photoelectric smoke detector 4 detects the concentration of suspended particulates in the circulation tank 2, and the circulation tank is detected. The suspended particulates are generated and controlled by the suspended particulates generating means 3 provided inside 2 to have a predetermined suspended particulate concentration, and the sensitivity is provided in the suspended particulate passage A to the photoelectric smoke sensor 7 to be adjusted. Since the concentration of suspended particulates is detected by the adjustment optical length measuring sensor device 5 and the sensitivity of the photoelectric smoke detector 7 is adjusted, the concentration detecting means is maintained over a long period in the relatively small circulation tank 2. Without exchanging
Sensitivity can be adjusted with little variation.

Then, the optical length measuring sensor device 5 serving as the second density detector for sensitivity adjustment emits the beam light B having a predetermined width and the incident light from the light projecting portion 51. The light receiving portion 52 that outputs an analog signal corresponding to the light blocking width of the light blocking member that is provided is disposed so as to be substantially orthogonal to the floating particle passing path A to the photoelectric smoke sensor 7 to be adjusted and floating. Since the particle concentration is detected and the sensitivity of the floating dust detector is adjusted, the average value of the floating particle concentration over a wide range in the cross section of the floating particle passage A inside the circulation tank 2 is within the circulation tank 2. The sensitivity is adjusted without changing the air flow, and thus the sensitivity can be adjusted with less variation.

[0027]

The present invention is implemented as described above, and the floating dust detector sensitivity adjusting apparatus and the sensitivity adjusting method using the same according to claims 1 and 3 are provided in a relatively small circulation tank. The sensitivity can be adjusted with a small variation without maintenance replacement of the concentration detecting means for a long period of time.

In addition, in the floating dust detector sensitivity adjusting device according to the second aspect, the beam light having a predetermined width of the optical length measuring sensor device serving as the second concentration detector for sensitivity adjustment is generated. The light emitting unit that emits light and the light receiving unit that outputs an analog signal corresponding to the light blocking width of the light entering from the light emitting unit by the light blocking body are provided in the floating particle passage to the floating dust detector to be adjusted. The airborne particle concentration is detected in a substantially orthogonal arrangement, and the sensitivity of the airborne dust detector is adjusted.Therefore, the average value of airborne particle concentration over a wide range in the cross section of the airborne particle passage inside the circulation tank Is detected and the sensitivity is adjusted, so that the sensitivity can be adjusted with less variation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a floating dust detector sensitivity adjusting device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a first concentration detector and a second concentration detector of a concentration detecting means used in the floating dust detector sensitivity adjusting device.

[Fig. 3] Second used in the sensitivity adjusting device for the same floating dust detector
5 is another explanatory diagram showing the concentration detector of FIG.

[Fig. 4] Second No. used in the sensitivity adjusting device for the floating dust detector
It is explanatory drawing which shows the effect | action of the concentration detector of FIG.

FIG. 5 is an explanatory diagram of a sensitivity adjusting method using the floating dust detector sensitivity adjusting device.

FIG. 6 is a schematic configuration diagram showing a floating dust detector inspection apparatus that is a conventional example of the present invention.

[Explanation of symbols]

1 Floating dust detector sensitivity adjustment device 2 circulation tanks 3 Floating particle generation means 4 First concentration detector (photoelectric smoke detector) 5 Second concentration detector (optical length measurement sensor device) 51 Projector 52 Light receiving part 7 Photoelectric smoke detector (floating dust detector) A suspended particle passage B beam light

Claims (3)

[Claims] 1. Sensitivity of a suspended dust detector for adjusting the sensitivity of a suspended dust detector provided with a suspended particulate generation means provided in a circulation tank and a concentration detection means for detecting the concentration of suspended particulates inside the circulation tank. An adjusting device, wherein, as the concentration detecting means, a first concentration detector that controls the generation of the suspended particulates by the suspended particulate generating means so that the suspended particulates have a predetermined suspended particulate concentration, and an object to be adjusted inside the circulation tank. And a second concentration detector for sensitivity adjustment, which is arranged in the passage of suspended particulates to the suspended dust detector, which is a floating dust detector sensitivity adjusting device. 2. A light projecting section, which emits a beam of light having a predetermined width and is arranged so as to be substantially orthogonal to the suspended particle passing path, and the second concentration detector is incident from the light projecting section. The floating dust detector sensitivity adjusting device according to claim 1, wherein the optical dust measuring sensor device has an optical length measuring sensor device having a light-shielding width of a light-shielding body and a light-receiving portion for outputting an analog signal corresponding thereto. 3. The suspended particulate concentration value in the circulation tank is corrected in accordance with the output value of the second concentration detector according to claim 1 or 2 to adjust the sensitivity at which the floating dust detector operates. A method for adjusting the sensitivity of a floating dust detector, which is performed on the corrected corrected concentration value.