JP2010255960A - Heat exchange ventilator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a heat exchange ventilation device providing a healthy, comfortable and safe living environment by informing an occupant of shortage of ventilation. <P>SOLUTION: The heat exchange ventilation device 1 for making a heat exchanger 2 exchange heat between a supply air current passing through an air supply air course and an exhaust air current passing through an air exhaust air course includes: a detection part 6 for detecting rotational frequency of at least one of an air supply air blower 3 and an air exhaust air blower 4; a determination part 6 for determining shortage of ventilation based on the rotational frequency detected by the detection part 6; and an informing part 10 for informing warning when the shortage of ventilation is determined by the determination part 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat exchange ventilator that performs ventilation while exchanging heat between outdoor air and indoor air using a heat exchanger.

  2. Description of the Related Art Conventionally, an exhaust passage for exhausting indoor air to the outside and an air supply passage for supplying outdoor air to the room are provided, and an exhaust flow flowing through the exhaust passage and an air supply flow flowing through the supply passage are There is a heat exchange ventilator that ventilates while exchanging heat between them. In such a heat exchange device, an air supply filter that removes dust and pollen in the outside air contained in the air flow and an exhaust filter that removes cotton dust and the like generated from clothing contained in the exhaust flow are provided. There is.

  These filters remove dust and the like from the supply airflow and exhaust flow by entrapping the dust and the like. Residents are required to perform maintenance such as cleaning and replacement regularly so that the filter is not clogged with tangled dust. If the resident forgets to perform maintenance, the filter may become clogged, resulting in insufficient ventilation (oxygen deficiency). Insufficient ventilation due to filter clogging caused problems such as health damage and accelerated aging of buildings.

  Thus, for example, Patent Document 1 discloses a technique for urging a resident to maintain a filter by turning on a lamp when the accumulated operation time of the heat exchange ventilator reaches a predetermined set time.

Japanese Patent Application No. 2005-187243

  However, according to the above-described conventional technology, the maintenance is only promoted based on the accumulated operation time of the heat exchange ventilator. Therefore, for example, when the amount of dust contained in the outside air is large and clogging occurs earlier than the set time, there is a problem that the state of insufficient ventilation continues until the accumulated operation time reaches the set time. It was.

  In addition, even when ventilation is insufficient due to factors other than clogging of the filter, the conventional technique cannot notify that ventilation is insufficient, and the state of insufficient ventilation continues. For example, if a fire damper installed in the middle of a duct connecting the exterior of a building and a heat exchange ventilator is closed due to a malfunction of a thermal fuse, the flow of supply air or exhaust air is obstructed and the filter Ventilation may be due to factors other than clogging.

  This invention is made in view of the above, Comprising: It aims at obtaining the heat exchange ventilator which can provide a healthy, comfortable, and safe living environment by alerting a resident of insufficient ventilation. To do.

  In order to solve the above-described problems and achieve the object, the present invention provides a main body casing, a heat exchanger provided in the main body casing, and a heat exchanger formed in the main body casing from the outdoor suction port via the heat exchanger. An air supply air passage that leads to the indoor air outlet, an exhaust air passage that is formed in the main body casing and leads from the indoor air inlet to the outdoor air outlet via the heat exchanger, and an air supply fan provided in the air supply air passage An exhaust fan provided in the exhaust air passage, and a filter provided in at least one of the air supply air passage and the exhaust air passage, and the air supply air passage and the exhaust air passage passing through the air supply air passage in the heat exchanger A heat exchange ventilator for exchanging heat with an exhaust flow passing therethrough, based on the number of rotations detected by the detection unit that detects the number of rotations of at least one of the air supply blower and the exhaust blower, and the detection unit Air supply or A determination unit for determining a ventilation insufficient exhaust flow is insufficient, characterized by having a a notification unit that performs a warning notification when it is judged that insufficient ventilation by discriminating unit.

  According to the present invention, since the lack of ventilation is determined and notified based on the rotation speed of the blower, the resident can be informed early of the state of insufficient ventilation. This makes it easier for residents to perform appropriate maintenance according to the state of the heat exchange ventilator, and prevents the heat exchange ventilator from being operated with insufficient ventilation, resulting in a healthy, comfortable and secure residence. There is an effect that the environment can be provided to the residents.

FIG. 1 is a plan configuration diagram of a heat exchange ventilator according to Embodiment 1 of the present invention. FIG. 2 is a characteristic diagram showing the relationship between the static pressure of the heat exchange ventilator, the rotational speed of the blower, and the air volume. FIG. 3 is a control flowchart showing a flow of blinking the LED lamp 10 when ventilation is insufficient. FIG. 4 is a diagram for explaining a method of canceling the notification of the maintenance time and the warning notification of insufficient ventilation. FIG. 5 is a connection diagram of the control device of the heat exchange ventilator and the switch unit. FIG. 6 is a circuit diagram illustrating a configuration example of the control circuit. FIG. 7 is a detailed view of a time setting switch provided in the heat exchange ventilator according to the first modification of the first embodiment. FIG. 8 is an operation time setting table switched by the time setting switch.

  Embodiments of a heat exchange ventilator according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a plan configuration diagram of a heat exchange ventilator according to Embodiment 1 of the present invention. The heat exchange ventilator 1 includes a main body casing 27, a heat exchanger 2, an air supply fan 3, an exhaust fan 4, a control device (detection unit) (discrimination unit) 6, and a switch unit (operation unit) 7. It is roughly structured. The main body casing 27 is formed with an outdoor inlet 1a, an indoor outlet 1b, an indoor inlet 1c, and an outdoor outlet 1d. The outdoor suction port 1 a is for taking outside air into the main body casing 27. The indoor outlet 1b is for supplying fresh air taken in from the outdoor inlet 1a and subjected to heat exchange into the room. The indoor suction port 1 c is for taking indoor air into the main body casing 27. The outdoor outlet 1d is for discharging the air taken in from the indoor inlet 1c and heat-exchanged to the outside.

  The heat exchanger 2 is accommodated in the main body casing 27. The heat exchanger 2 has a rectangular column shape in which a large number of corrugated plates that secure an air passage and a large number of flat plates having heat conductivity are alternately stacked. In the heat exchanger 2, two types of air paths perpendicular to the inside are formed by alternately interposing the corrugated plate while changing the corrugation direction by 90 °. In these two types of air passages, the heat exchanger 2 is accommodated in the main body casing 27, so that one air passage becomes a part of the supply air passage and the other air passage becomes a part of the exhaust air passage. .

  In the main body casing 27, an air supply air passage is formed from the outdoor suction port 1a to the indoor outlet 1b. Further, an exhaust air passage extending from the indoor suction port 1c to the outdoor air outlet 1d is formed in the main body casing 27. The supply air blower 3 is provided in the supply air passage and generates a supply air flow A during operation. The exhaust blower 4 is provided in the exhaust air passage and generates an exhaust flow B during operation.

  An air supply filter 8a is provided on the upstream side of the heat exchanger 2 in the air supply air path to remove dust and pollen from outside air contained in the air supply airflow. On the upstream side of the heat exchanger 2 in the exhaust air passage, an exhaust filter 8c is provided to remove cotton dust and the like generated from clothes included in the exhaust flow.

  The control device 6 controls the air supply fan 3 and the exhaust fan 4. The switch unit 7 includes a ventilation operation switch (switch) 7a for operating the heat exchange ventilator 1, and a strength changeover switch (switch) 7b for switching the ventilation air volume (also FIG. 4). reference.). The switch unit 7 is provided, for example, on a wall surface in the room so that a resident can easily operate it. The ventilation operation switch 7a is for turning on and off the operation of the heat exchange ventilator 1. An LED is built in the ventilation operation switch 7a, and this LED is lit when the operation of the heat exchange ventilator 1 is “ON”. The strength change switch 7b is for switching between strong operation with a large ventilation air volume and weak operation with a small ventilation air volume.

  The control device 6 includes a control circuit 6a for adjusting the output voltages to the air supply blower 3 and the exhaust blower 4, respectively, and for operating the air supply blower 3 and the exhaust blower 4. The control circuit 6a adjusts the output voltage to the air supply blower 3 and the exhaust blower 4 based on the operation of the strong / weak switch 7b, respectively, so that the strong operation with a large ventilation air flow and the weak operation with a small ventilation air flow are performed. Switch. The control device 6 detects the rotational speed of each of the blowers 3 and 4.

  The control device 6 has a function of integrating the operation time of the exhaust fan 4 or the air supply fan 3. When the integrated operation time of the exhaust fan 4 or the supply fan 3 reaches a predetermined set time, the control device 6 causes the LED lamp 10 to blink at predetermined intervals. Since the LED lamp 10 is “lighted” in the normal operation state, the periodical maintenance time of the air supply filter 8a and the exhaust filter 8c is notified to the resident by “flashing at predetermined intervals”. Can do. That is, the LED lamp 10 notifies the maintenance time by showing a lighting mode (flashing) different from that during normal operation. Note that the predetermined blinking interval is arbitrary, for example, it may be turned on for 2 seconds and turned off for 2 seconds. In addition, heat exchange ventilators are not limited to those equipped with both an air supply filter and an exhaust filter. If either one of the filters is installed, the effect of being able to notify the regular maintenance time of the filter can be achieved. Obtainable.

  FIG. 2 is a characteristic diagram showing the relationship between the static pressure of the heat exchange ventilator 1 and the rotational speed of the blower and the air volume. As described above, the control device 6 detects the rotational speed of each of the blowers 3 and 4. The control device 6 detects and notifies an abnormality of the heat exchange ventilator 1 based on the detected rotational speed.

  In FIG. 2, a characteristic curve 11 represents the relationship between air volume and static pressure. The heat exchange ventilator 1 has a ventilation performance indicated by a characteristic curve 11. The duct total pressure loss 12 represents the relationship between the air volume and the static pressure in the initial stage when the duct pipe connected to the heat exchange ventilator 1, the outdoor hood, and the fire damper is installed. The intersection A between the characteristic curve 11 and the duct total pressure loss 12 is the ventilation air volume by the heat exchange ventilator 1, and the rotational speed of the blowers 3 and 4 at that air volume is C.

  If the ventilation operation is continued (for example, continuous operation for 24 hours), the air supply filter 8a and the exhaust filter 8c are clogged due to adhesion of cotton dust or outside air dust. When the filters 8a and 8c are clogged, the duct total pressure loss 12 rises in the direction of the arrow. The total pressure loss 13 of the duct is when the filters 8a and 8c are clogged so that the air hardly passes or when the duct pipe is fully closed due to a failure of the temperature fuse of the fire damper. , Rising up to duct total pressure loss 13.

  In this case, the intersection B between the characteristic curve 11 and the duct total pressure loss 13 becomes the ventilation air volume by the heat exchange ventilator 1, and the rotational speed of the blowers 3 and 4 at that air volume becomes D. Compared with the intersection A, the air volume is remarkably reduced, and even if the blowers 3 and 4 are rotating, the ventilation is hardly performed. In addition, the rotational speed of the blowers 3 and 4 is significantly increased from the C position to the D position, the driving sound is also increased, and there is a problem that unpleasantness is given to the occupants.

  When the rotational speed of the blowers 3 and 4 exceeds the threshold value 14 and becomes D, the control device 6 determines that ventilation is insufficient and causes the LED lamp 10 to blink. FIG. 3 is a control flowchart showing a flow of blinking the LED lamp 10 when ventilation is insufficient. The control device 6 reads the rotational speeds of the blowers 3 and 4 during normal operation (step S1). When the rotational speed of the exhaust fan 4 is smaller than the threshold 14 (step S2, Yes) and the rotational speed of the air supply fan 3 is smaller than the threshold 14 (step S3, Yes), special control is performed. Read the rotation speed again. When the rotational speed of the exhaust fan 4 is greater than or equal to the threshold value 14 (step S2, No), or when the rotational speed of the air supply fan 3 is greater than or equal to the threshold value 14 (step S3, No), the LED lamp 10 is blinked ( Step S4).

  As a result, it is possible to perform a warning notification (abnormal display) that easily informs the occupant of insufficient ventilation due to clogging of the filter or malfunction of the fire damper. That is, the warning is given by the LED lamp 10 showing a lighting mode (flashing) different from that during normal operation. In addition, by making the blinking interval of the LED lamp 10 different from the case of informing the regular maintenance time, it is possible to make the resident know more reliably that there is insufficient ventilation such that ventilation is hardly performed. it can. For example, it is good also as blinking of the short cycle which repeats 0.5 second lighting and 0.5 second light extinction. In this way, the LED lamp 10 blinks to notify the regular maintenance time and lack of ventilation, so that even if a switch unit that is commercially available without using a special switch unit is used, the ventilation is insufficient. It is possible to configure the switch unit 7 that can notify the above.

  FIG. 4 is a diagram for explaining a method of canceling the notification of the maintenance time and the warning notification of insufficient ventilation. As shown in FIG. 4, switching such that the notch of the strong / weak switch 7b is changed from “weak” → “strong” → “weak” or “strong” → “weak” → “strong” is continuously performed within a predetermined time. As a result, the control device 6 receives a signal from the switch unit 7 and returns the LED lamp 10 to a lighting state indicating normal operation. Thereby, the state where the LED lamp 10 is blinking can be easily canceled in order to notify the maintenance time or to notify the lack of ventilation. In addition, you may comprise so that warning alert | report may be cancelled | released by operating the ventilation operation switch 7a continuously.

  Next, the operation control of the heat exchange ventilator 1 will be described. FIG. 5 is a connection diagram of the control device 6 and the switch unit 7 of the heat exchange ventilator 1. As shown in FIG. 5, the input terminals of the terminal blocks I to V are provided, and the control circuit 6a is activated by supplying power to the terminal blocks I and II. Further, by connecting the ventilation operation switch 7a and the terminal block III and turning the ventilation operation switch 7a to “ON”, the heat exchanging ventilator 1 becomes a strong operation. Furthermore, by connecting the strength changeover switch 7b and the terminal block IV and turning the strength changeover switch 7b to “ON”, the heat exchange ventilator 1 becomes weakly operated.

  Next, blinking control of the LED lamp 10 provided in the ventilation operation switch 7a for notifying the maintenance time of the filters 8a and 8c will be described. In FIG. 5, the ventilation operation switch 7a incorporates an LED lamp 10 that is turned on when AC 100V is input and a current flows.

  FIG. 6 is a circuit diagram showing a configuration example of the control circuit 6a. The control circuit 6 a is always supplied with commercial power (AC 100 V) 15, and the power circuit 16 generates power to operate the microcomputer 17. The control circuit 6a includes an input circuit block and an output circuit block. The input circuit block includes current limiting resistors 19a and 19b, a rectifying diode 22, and an input photocoupler 24. The microcomputer 17 detects an on / off input 26 of the ventilation operation switch 7a.

  The output circuit block includes a bleeder resistor 20, a diode bridge 23, a current limiting resistor 21, and an output photocoupler 25 connected in parallel with the input circuit block. The microcomputer 17 controls the lighting / extinguishing control 28 of the LED lamp 10. .

  When the LED lamp 10 is turned on, the output photocoupler 25 is turned on to short-circuit the current limiting resistor 21, and a current is passed through the LED lamp 10 via the bleeder resistor 20. When the LED lamp 10 is turned off, the output photocoupler 25 is turned off. Since a current flows through the current limiting resistor 21, the LED lamp 10 is turned off. When the LED lamp 10 is blinked, the output photocoupler 25 is repeatedly turned ON / OFF at an arbitrary interval. In addition, since the electric current which flows into an input circuit block is very small, it does not result in lighting of the LED lamp 10. When the microcomputer 17 performs the above control based on a command from the control device 6, the LED lamp 10 is “lit”, “off”, and “flashing” according to the state of the heat exchange ventilator 1.

  As described above, in addition to the periodic maintenance time notification, the actual clogging state of each filter 8a, 8c, the state of the fire damper, etc. are detected based on the rotation speed of the blowers 3, 4. If the filters 8a and 8c are clogged earlier than the set time, or if the fire damper is fully closed due to a thermal fuse failure However, it is possible to inform residents of these conditions early. This makes it easier for residents to perform appropriate maintenance according to the state of the heat exchange ventilator 1, and prevents the heat exchange ventilator 1 from being operated with insufficient ventilation, which is healthy, comfortable and secure. A comfortable living environment can be provided to residents.

  FIG. 7 is a detailed view of a time setting switch provided in the heat exchange ventilator according to the first modification of the first embodiment. In the first modification, the set time that is a reference for notifying the regular maintenance time can be changed. In addition, a reset button for releasing the blinking of the LED lamp 10 is provided.

  The time setting switch 9 is provided in the control device 6, for example. The time setting switch 9 is provided with an operation time setting switch 9a and a reset switch 9b for resetting the integration of the operation time. The operation time setting switch 9a can be slid to switch the notch in four stages from 1 to 4.

  FIG. 8 is a setting table of operation times switched by the time setting switch 9. For example, when the notch of the operation time setting switch 9a is 2, when the operation integration time is 4300 hours (6 months as a guide) or more, the LED lamp 10 blinks and a regular maintenance time is set. Informed. Further, the accumulated operation time is reset by pressing the reset switch 9b, and the LED lamp 10 is switched from “flashing” to “lighting”. The setting of the operation time in each notch described in FIG. 8 is an example, and is not limited to this. According to the first modification, it is possible to select the operation time during which the maintenance time is notified in accordance with the environment in which the heat exchange ventilator 1 is used and the use needs of the resident.

  The time setting switch 9 may be provided in the switch unit 7. Since the switch unit 7 is often installed in a place where the resident can easily operate, the resident can easily change the setting of the operation time for which the maintenance time is notified.

  As described above, the heat exchange ventilator according to the present invention is useful for a heat exchange ventilator provided with a filter, and is particularly suitable for a heat exchange ventilator that performs notification of maintenance time and the like.

DESCRIPTION OF SYMBOLS 1 Heat exchange ventilator 1a Outdoor inlet 1b Indoor outlet 1c Indoor inlet 1d Outdoor outlet 2 Heat exchanger 3 Blower for supply of air 4 Blower for exhaust 6 Control device 6a Control circuit 7 Switch unit 7a Ventilation operation switch 7b Intensity switching Switch 8a Air supply filter 8c Exhaust filter 9 Time setting switch 9a Operation time setting switch 9b Reset switch 10 LED lamp (notification unit)
DESCRIPTION OF SYMBOLS 11 Characteristic curve 12 Duct total pressure loss 13 Duct total pressure loss 14 Threshold value 16 Power supply circuit 17 Microcomputer 19a, 19b Current limiting resistor 20 Bleeder resistance 21 Current limiting resistor 22 Rectifier diode 23 Diode bridge 24 Input photocoupler 25 Output photocoupler 27 Main body casing

Claims (5)

A main body casing, a heat exchanger provided in the main body casing, an air supply air passage formed in the main body casing and leading from an outdoor suction port to an indoor outlet through the heat exchanger, and in the main body casing An exhaust air passage that is formed in the indoor air inlet and communicates with the outdoor air outlet through the heat exchanger, an air supply fan provided in the air supply air passage, and an exhaust air fan provided in the exhaust air passage And a filter provided in at least one of the supply air passage and the exhaust air passage, and in the heat exchanger, a supply air flow passing through the supply air passage and an exhaust flow passing through the exhaust air passage It is a heat exchange ventilator that ventilates while exchanging heat between,
A detection unit for detecting the rotational speed of at least one of the air supply fan and the exhaust air fan;
A discriminator for discriminating insufficient ventilation based on the number of revolutions detected by the detector;
A heat exchange ventilator, comprising: a notification unit that issues a warning notification when the determination unit determines that ventilation is insufficient.   The heat exchanging ventilator according to claim 1, wherein the discriminating unit discriminates that the ventilation is insufficient when the number of revolutions detected by the detecting unit exceeds a predetermined threshold. And further comprising an operation unit capable of operating the heat exchange ventilator,
The notification unit is a lamp provided in the operation unit,
The heat exchange ventilator according to claim 1 or 2, wherein the warning notification is performed by the lamp showing a lighting mode different from that during normal operation of the heat exchange ventilator. The operation unit includes a switch for switching the operation of the heat exchange ventilator,
The heat exchange ventilator according to any one of claims 1 to 3, wherein the warning notification can be canceled by repeating the switching operation by the switch. The notification unit performs the warning notification when the accumulated operation time of the heat exchange ventilator is equal to or longer than a predetermined set time,
The heat exchange ventilator according to any one of claims 1 to 4, further comprising a setting changing unit that allows the setting time to be changed.

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