JP5787860B2 - Heat exchange ventilator - Google Patents

Description

  The present invention relates to a heat exchange ventilator.

  Conventionally, in order to perform planned ventilation of a house, an air supply air passage for supplying outdoor air to the room and an exhaust air air passage for exhausting the indoor air to the outside have been formed. There was a heat exchange ventilator installed behind the ceiling that ventilates while exchanging heat.

  By arranging a heat exchanger and an air supply blower and an exhaust blower located downstream of the heat exchanger in such a heat exchange ventilator, the air velocity distribution of the heat exchanger is improved. Further, by installing a filter on the upstream side of the heat exchanger, the air supply blower and the exhaust blower are made difficult to get dirty.

  By the way, when heat exchange ventilation is performed in winter and the outside air temperature is lowered, the indoor air is cooled by exchanging heat with the air from the outside, and the drain water generated thereby may flow out of the heat exchanger. . The drain water is discharged from the drain pipe connection port. However, since the drain pipe connection portion is at a negative pressure by the exhaust fan, the drain water is hardly discharged by the air resistance in the drain pipe.

  At this time, depending on the length and gradient of the drain pipe, the drain water may stay in the drain pipe due to the drainage of drain water and the suction pressure generated by the exhaust fan. As a result, abnormal sounds such as popping sounds are generated and the user is uncomfortable, and sleep can be disturbed particularly at night.

  In particular, when air exhausted from the room is introduced from the bathroom, even if the outside air temperature is relatively high, drain water is likely to be generated due to the high absolute humidity of the air exhausted from the room. Since the state in which sound is likely to be generated at the subsequent bedtime overlaps, there is a high possibility that the user will feel uncomfortable.

  Also, if the pressure loss from the indoor exhaust grill to the main unit is large, or if the exhaust filter is clogged with dust, it is difficult to suck wind from the exhaust air passage, and sucks more air from the drain pipe. become. For this reason, the suction pressure in the drain pipe is increased, and abnormal noise such as unevenness is likely to occur.

  In response to the above problems, the pressure loss of the drain pipe is increased by reducing the diameter of the drain pipe or increasing the length of the drain pipe when constructing the heat exchange ventilator, and the suction pressure in the drain pipe. The retention of drain water was aimed at by making small. Moreover, the drain water retention was suppressed by increasing the drain piping gradient and increasing the drain water drainage power.

  In addition, when the heat exchange ventilator is used, the supply air fan and the exhaust air fan are temporarily stopped or weakly operated to reduce the suction pressure in the drain pipe, thereby suppressing the retention of drain water. It was. In addition, the exhaust side filter is frequently cleaned to reduce the pressure loss in the exhaust air passage, and the suction pressure in the drain pipe is reduced to suppress the retention of drain water.

  In addition, when drain water generated by an air conditioner or the like is discharged to the outside, abnormal noise such as popping may occur when a ventilation fan in a dwelling unit is operated or a strong wind blows in a high-rise apartment or the like. To solve this problem, a drain treatment device equipped with a check valve made of a conical soft rubber with a cruciform space slit at the tip is installed at the tip of the drain hose to generate abnormal noise such as (For example, Patent Document 1).

Japanese Patent No. 3898154 ([0014], FIG. 2)

  However, at the time of construction of the heat exchange ventilator, there is a problem that if the length of the drain pipe is increased, the cost is increased and it is difficult to remove the gradient. Moreover, when the length of the drain pipe is increased, there is a problem that a sufficient gradient cannot be secured due to restrictions on the installation location (such as the ceiling behind) of the heat exchange ventilator.

  Further, when the heat exchange ventilator is used, if the air supply fan and the exhaust fan are stopped or weakly operated, there is a problem that the normal operation must be returned after a certain time. In addition, when using the heat exchange ventilator, the filter is mounted inside the main body installed in a space such as the ceiling, so there is a problem that elderly people and the handicapped cannot easily clean. It was.

  Moreover, when the drain processing apparatus of patent document 1 is used for the drain piping of a heat exchange ventilator, (i) the diameter of the drain piping does not match, (ii) a pop sound was generated in an installed unit such as an apartment house. In this case, there is a possibility that the drain treatment apparatus cannot be installed later, and (iii) the drain slit overflows from the heat exchange ventilator because the space slit is clogged with dust and the drain water cannot be drained.

  The present invention has been made against the background of the above-described problems, and an object thereof is to provide a heat exchange ventilator that suppresses the occurrence of abnormal noise.

The present invention includes an outdoor suction port, an indoor air outlet, an indoor air inlet, and a main body formed with an outdoor air outlet, a heat exchanger provided inside the main body, and the outdoor air inlet through the heat exchanger. On the air supply air passage leading to the indoor air outlet and on the downstream side of the heat exchanger, and the exhaust air communicating from the indoor air inlet to the outdoor air outlet via the heat exchanger An exhaust blower provided on the downstream side of the heat exchanger on the air path, an outside air temperature detecting means for detecting the outside air temperature, and the exhaust air blower based on the detected temperature of the outside air temperature detecting means. Control means for controlling, when the temperature detected by the outside air temperature detection means is equal to or lower than a threshold temperature, to stop the exhaust blower or reduce the air flow of the exhaust blower , Air supply blower It is intended to continue the rotation.

  According to the present invention, since the suction pressure in the drain pipe is reduced and the drain water is reliably drained, the occurrence of abnormal noise can be suppressed.

It is a plane block diagram of the heat exchange ventilation apparatus which concerns on Embodiment 1 of this invention. It is a control flowchart of the control means of the heat exchange ventilation apparatus which concerns on Embodiment 1 of this invention. It is a block diagram of the control means of the heat exchange ventilation apparatus which concerns on Embodiment 2 of this invention. It is a control flowchart of the control means of the heat exchange ventilation apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a plan configuration diagram of a heat exchange ventilator 100 according to Embodiment 1 of the present invention.
As shown in FIG. 1, a heat exchange ventilator 100 includes a main body 1, a heat exchanger 2, an air supply fan 3, an exhaust fan 4, and a drain pipe connection port 5 for discharging drain water. And an outside air temperature detection means 6 and a control means 7.

  The main body 1 is for supplying fresh air, which is taken into the main body 1 from the outdoor suction port 1a and the outdoor suction port 1a for taking outside air into the main body 1, and is heat-exchanged by the heat exchanger 2. The indoor air outlet 1b, the indoor air inlet 1c for taking indoor air into the main body 1, and the air taken into the main body 1 from the indoor air inlet 1c and heat-exchanged by the heat exchanger 2 are discharged outside the room. For this purpose, an outdoor outlet 1d is formed.

  The heat exchanger 2 is provided in the main body 1, and a large number of corrugated plates (not shown) that secure an air passage and a large number of heat conductive plates (not shown) are alternately stacked, and the corrugated plates are alternately arranged. Is formed in a prismatic shape by inserting the waveform forming direction by changing by 90 °.

  The air supply blower 3 is provided in the main body 1 and starts operation, thereby generating an air supply air A from the outdoor suction port 1a through the heat exchanger 2 to the indoor air outlet 1b. Is formed. The air supply blower 3 is provided on the supply air path and on the downstream side of the heat exchanger 2.

  The exhaust blower 4 is provided in the main body 1, and when the operation is started, the exhaust blower 4 generates an exhaust flow B from the indoor suction port 1c through the heat exchanger 2 to the outdoor outlet 1d. It is formed. The exhaust blower 4 is provided on the exhaust air passage and on the downstream side of the heat exchanger 2.

  The outside air temperature detecting means 6 is for detecting the outside air temperature taken into the main body 1. The control means 7 controls the operation of the air supply blower 3 and the exhaust blower 4 based on input information from the outside air temperature detection means 6 and the like.

Next, prior to describing the operation of the first embodiment, the normal operation of the heat exchange ventilator 100 will be described.
When the user requests operation by an operation changeover switch (not shown), the control means 7 starts operation of the air supply blower 3 and the exhaust air blower 4, and a supply airflow A and an exhaust flow B are generated. The supply air flow A and the exhaust air flow B are circulated through a corrugated plate constituting the heat exchanger 2 and a flat plate having good heat conductivity, and are ventilated while recovering heat. Thereby, heat loss during cooling and heating is reduced, fresh air is taken into the room, and dirty air in the room is discharged outside the room. And when a user requests | requires a stop of driving | operation with a driving | operation changeover switch, the control means 7 will stop the air supply fan 3 and the exhaust air fan 4. FIG.

FIG. 2 is a control flowchart of the control means 7 of the heat exchange ventilator 100 according to Embodiment 1 of the present invention.
Hereinafter, the control of the control means 7 of the first embodiment will be described with reference to FIG. The program of this flowchart is stored in a ROM or the like (not shown) of the microcomputer of the control means 7 (the same applies to the second embodiment described later).

(Steps S1, S2)
In step S1, when the user requests an operation with an operation changeover switch (not shown), the control means 7 starts the operation of the air supply blower 3 and the exhaust blower 4, and proceeds to step S2.
In step S2, the control means 7 counts the elapsed time from the start of operation, and when Ta minutes (for example, 55 minutes) have elapsed, the control means 7 proceeds to step S3.

(Steps S3 and S4)
In step S3, when the outside air temperature is lower than the threshold temperature (for example, 10 ° C.) (Yes in step S3), the control unit 7 proceeds to step S4. In step S4, the control means 7 stops the exhaust blower 4 for Tb (for example, 5 minutes) or switches to a weak operation and switches to a normal operation after a lapse of Tb, and shifts to step S2.
On the other hand, when the outside air temperature is higher than a threshold temperature (for example, 10 ° C.) (No in step S3), the control unit 7 switches to normal operation and moves to step S2.
Note that the above-described threshold temperature is determined in advance.

  As described above, in the heat exchange ventilator 100 according to the first embodiment, the control unit 7 stops the exhaust blower 4 or the exhaust blower when the temperature detected by the outside air temperature detection unit 6 is equal to or lower than the threshold temperature. 4 is operated with the air volume reduced. For this reason, since the suction pressure in the drain pipe is lowered and the drain water is reliably drained, the generation of abnormal noise can be suppressed.

  Moreover, it is not necessary to reduce the diameter of the drain pipe or lengthen the length of the drain pipe when constructing the heat exchanging ventilator 100, and it is possible to suppress the cost during construction by providing the drain pipe at the shortest distance. It becomes easy to secure a gradient.

  Moreover, since the control means 7 is controlling the exhaust fan 4 at the time of use of the heat exchange ventilator 100, after operating the exhaust fan 4 to stop or reducing the air volume of the exhaust fan 4, There is no need for the user to consider returning to normal operation. In addition, since the pressure loss in the exhaust air passage is reduced, the burden of cleaning the exhaust-side filter is reduced.

  Moreover, in the property where the construction of the heat exchanging ventilator 100 has been completed, it is possible to cope with the case where the drain treatment device or the like as described above cannot be installed after the construction. Further, a drain treatment device is installed in the middle of the drain pipe, and dust or the like is clogged and blocked in the space slit, so that there is no possibility that the drain water overflows from the heat exchange ventilator 100.

  Further, since the control means 7 controls the exhaust fan 4 based on the outside air temperature, the second type ventilation (supply: mechanical ventilation, exhaust: natural) is unnecessarily performed in the summer season when drain water is not generated. 1st type ventilation (supply: mechanical ventilation, exhaust: mechanical ventilation) can be continued more reliably without shifting to (ventilation), and ventilation in the house can be performed more reliably it can.

  In the heat exchanging ventilator 100, control for stopping the air supply blower 3 for a predetermined time is incorporated in the control means 7 in order to suppress clogging due to icing in the heat exchanger 2 according to the outside air temperature. There may be.

Embodiment 2. FIG.
FIG. 3 is a configuration diagram of the control means 7 of the heat exchange ventilator 100 according to Embodiment 2 of the present invention.
As shown in FIG. 3, the control means 7 includes a threshold temperature setting means 8 that changes the threshold temperature, and a drain wastewater treatment setting means 9 that sets whether to control the exhaust fan 4. The threshold temperature setting means 8 is constituted by a volume switch, for example. The drain wastewater treatment setting means 9 is constituted by a slide switch or a dip switch, for example.

FIG. 4 is a control flowchart of the control means 7 of the heat exchange ventilator 100 according to Embodiment 2 of the present invention.
Hereinafter, the control of the control means 7 of the second embodiment will be described with reference to FIG.

(Steps S11 to S12)
In step S11, when the user requests operation by an operation changeover switch (not shown), the control means 7 starts operation of the air supply blower 3 and the exhaust blower 4, and proceeds to step S12.
In step S12, the control means 7 counts the elapsed time from the start of operation, and when Ta minutes (for example, 55 minutes) have elapsed, the control means 7 proceeds to step S13.

(Step S13)
In step S13, when the outside air temperature is lower than a threshold temperature (for example, 10 ° C.) (Yes in step S13), the control unit 7 proceeds to step S14.
On the other hand, when the outside air temperature is higher than the threshold temperature (for example, 10 ° C.) (No in Step S13), the control unit 7 again counts the elapsed time in Step S12. Note that the above-described threshold temperature can be changed by operating the threshold temperature setting means 8.

(Steps S14 to S15)
In step S14, the control means 7 determines whether or not the air supply fan 3 is operating.
If the control means 7 determines that the air supply blower 3 is in operation (Yes in step S14), the control means 7 proceeds to step S15. In step S15, the control means 7 stops the exhaust blower 4 for Tb (for example, 5 minutes) or switches to a weak operation and switches to a normal operation after the elapse of Tb, and shifts to step S12.
On the other hand, if the control means 7 determines that the operation of the air supply fan 3 is stopped (No in step S14), the control means 7 repeats step S14 until the operation of the air supply fan 3 is started.

  When the drain wastewater treatment setting unit 9 is set to be effective, the control of FIG. 4 is performed, but when the drainage wastewater treatment setting unit 9 is set to be invalid, the above-described control is performed. Since normal control is not performed, normal operation is continued.

  As described above, the heat exchange ventilator 100 according to the second embodiment is configured to supply air when the control unit 7 is operating with the exhaust blower 4 stopped or the exhaust blower 4 having a reduced air volume. The operation of the blower 3 is continued. For this reason, it is possible to continue the ventilation by switching the first type ventilation to the second type ventilation without stopping the ventilation of the house.

  The heat exchange ventilator 100 according to the second embodiment includes a threshold temperature setting unit 8 that changes the threshold temperature. For this reason, when the intake air from the room is taken from the bathroom, the amount of absolute humidity contained in the air increases, the outside air temperature becomes relatively high, and it is possible to cope with the case where drain water is generated. .

Further, the heat exchange ventilator 100 according to the second embodiment includes a drain wastewater treatment setting unit 9 that sets whether to control the exhaust fan 4. For this reason, it is possible to set the validity and invalidity of the function itself of stopping the exhaust blower 4 for a predetermined time or switching to a weak operation, and it is possible to operate this function more limitedly when necessary.
Therefore, for example, when draining water is not generated, such as when using in a warm area or when exchanging heat without taking in the room from the bathroom, the drainage treatment setting means 9 is disabled at the time of product shipment. The abnormal drainage can be improved by setting the drain drainage treatment setting means 9 only for use in cold districts or for the property where abnormal noise due to drain water is generated by taking in the room from the bathroom. It becomes possible.

  The threshold temperature setting means 8 and the drain wastewater treatment setting means 9 may be provided separately from the control means 7.

  DESCRIPTION OF SYMBOLS 1 Main body, 1a Outdoor air inlet, 1b Indoor air outlet, 1c Indoor air inlet, 1d Outdoor air outlet, 2 Heat exchanger, 3 Air supply fan, 4 Air exhaust fan, 5 Drain pipe connection port, 6 Outside air temperature detection means 7, control means, 8 threshold temperature setting means, 9 drainage treatment setting means, 100 heat exchange ventilator.

Claims (3)

A main body formed with an outdoor air inlet, an indoor air outlet, an indoor air inlet, and an outdoor air outlet;
A heat exchanger provided inside the body;
An air supply blower provided on a downstream side of the heat exchanger on the air supply air passage leading from the outdoor suction port to the indoor outlet through the heat exchanger;
An exhaust fan provided on the downstream side of the heat exchanger on the exhaust air passage from the indoor suction port to the outdoor air outlet through the heat exchanger;
An outside air temperature detecting means for detecting the outside air temperature;
Control means for controlling the exhaust fan based on the detected temperature of the outside air temperature detecting means,
The control means includes
When the temperature detected by the outside air temperature detection means is equal to or lower than a threshold temperature, the exhaust fan is stopped or operated with the air volume of the exhaust fan being reduced, and the operation of the supply fan is continued. Heat exchanging ventilator. Heat exchange ventilator according to claim 1 Symbol mounting characterized by comprising a threshold temperature setting means for changing the threshold temperature. The heat exchange ventilator according to claim 1 or 2, further comprising a drain wastewater treatment setting unit configured to set whether or not to control the exhaust fan.

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