JP2011220561A - Heat exchanger ventilator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger ventilator which maintains air ventilation even if outside air is highly humid, and prevents a heat exchanger from getting wet in order to prevent deterioration in heat exchanging performance.SOLUTION: The heat exchanger ventilator includes a humidity sensor disposed in an air supply passage, a bypass passage which is disposed parallel to the air supply passage and bypasses a heat exchanger, and a damper which conducts switching the air supply passage to the bypass passage and vice versa. When the humidity of outside air measured with a humidity sensor is equal to or higher than a given reference value Ra in a heat exchange ventilation operation mode in which the damper closes the bypass passage and opens the air supply passage, the heat exchanger ventilator switches over to a normal ventilation operation mode in which the damper closes the air supply passage and opens the bypass passage.

Description

The present invention relates to a heat exchange ventilator that is mainly used in the field of ventilation and performs heat exchange between supply air and exhaust gas via a heat exchanger while performing simultaneous supply / exhaust ventilation.

In a conventional heat exchange ventilator, for example, as disclosed in Japanese Patent Application Laid-Open No. 2008-309381, a box body in which a pair of an inlet and an outlet is provided on each of an indoor side and an outdoor side, The air supply air blower built in the interior sucks outdoor air from the outdoor intake port, supplies the air from the indoor air outlet to the room through the air supply passage of the heat exchanger, and the exhaust air blower from the indoor air intake port to the room. Heat exchange is performed between the supply air flow and the exhaust flow provided at the intersection of the intake passage and the exhaust passage, and an exhaust passage that sucks air and exhausts it from the outdoor outlet through the exhaust passage of the heat exchanger. A heat exchanger, a bypass air passage that is provided alongside the exhaust passage or the air supply passage and bypasses the heat exchanger, and a damper that can switch the air passage through the heat exchanger and the bypass air passage , Outdoor suction port, indoor suction port A temperature sensor and a humidity sensor are installed in each, the outdoor absolute humidity calculated from the outdoor, indoor temperature sensor and outdoor, and indoor humidity sensors can be compared with the indoor absolute humidity, and the indoor humidity can be lowered. There is a heat exchange ventilator that can switch the air volume and air path so that the temperature does not drop too much.

JP 2008-309281 A

In conventional heat exchange ventilators, in areas where fog and haze often occur in the morning and evening, high-humidity air such as haze and haze is ventilated by the ventilation along with the recent needs for 24-hour ventilation (always ventilation). There is a high possibility that air is supplied from the suction port. In the conventional heat exchange ventilator, regardless of the relative humidity of the outdoor air, if the outdoor air is higher than the absolute humidity of the indoor air, the air volume of the heat exchange ventilator is 20% or less in the heat exchange ventilation operation. Although it was possible to switch to a weak air volume and prevent dew condensation in the room due to ventilation, if a lot of mist or soot was generated over a long period of time, high-humidity air containing inhaled mist or soot was generated inside the heat exchange ventilator. The heat exchanger sometimes agglomerates or condenses and gets wet with water. Since heat exchangers that can exchange total heat are generally made of paper, there is a problem that the heat exchange performance of the heat exchanger decreases due to repeated wetting with water. .

The present invention has been made in order to solve the above-described problems. When the humidity of the outdoor air is equal to or higher than a predetermined reference value even during the heat exchange ventilation operation, the outdoor air is not automatically supplied to the heat exchanger. In order to switch to the ventilation operation, the heat exchanger is prevented from getting wet with water, and the object is to prevent the heat exchange performance of the heat exchanger from deteriorating.

  In the heat exchanging ventilator according to the present invention, the air supply is stored in the casing, sucks outdoor air from the outdoor intake port by the air supply blower, and supplies air into the room from the indoor side outlet through the air supply passage of the heat exchanger And an exhaust passage that sucks room air from the indoor air inlet through the exhaust air blower and exhausts the air from the outdoor air outlet to the outside through the exhaust passage of the heat exchanger, and an air supply passage upstream of the heat exchanger. Controls humidity sensor that measures the humidity of outdoor air, bypass passage that is arranged in parallel with the air supply passage and bypasses the heat exchanger, damper that switches between the air supply passage and the bypass passage, and the air supply and exhaust blowers and damper And the control device is configured such that the humidity of the outdoor air measured by the humidity sensor when the damper is in a heat exchange ventilation operation state in which the damper is closed and the air supply passage is opened is a predetermined reference value. In the case of more than a is for switching to the normal ventilation operation which damper opens the bypass passage side closing said air supply passage.

According to the present invention, when the outdoor air has a high humidity exceeding a predetermined reference value, the outdoor air is switched to normal ventilation that does not pass through the heat exchanger. Accumulation can be suppressed and the heat exchanger can be prevented from getting wet and the heat exchange performance being lowered.

It is a see-through | perspective perspective view of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. 1 is a perspective plan view of a heat exchange ventilator showing a first embodiment of the present invention. It is a see-through | perspective side view of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. It is a flowchart figure showing operation | movement of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. It is an air volume notch table | surface of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. It is an air volume notch table | surface of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. It is a perspective top view of the heat exchange ventilation apparatus which shows Embodiment 2 of this invention. It is a see-through | perspective side view of the heat exchange ventilation apparatus which shows Embodiment 2 of this invention. It is a see-through | perspective side view of the bypass channel | path of the heat exchange ventilation apparatus which shows Embodiment 2 of this invention. It is an external view of the external controller of the heat exchange ventilation apparatus which shows Embodiment 2 of this invention. It is a flowchart figure showing operation | movement of the heat exchange ventilation apparatus which shows Embodiment 2 of this invention. It is a see-through | perspective side view of the bypass channel of the heat exchange ventilation apparatus which shows Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a heat exchange ventilator showing Embodiment 1 of the present invention, FIG. 2 is a perspective plan view of the heat exchange ventilator showing Embodiment 1 of the present invention, and FIG. It is a see-through | perspective side view of the heat exchange ventilation apparatus which shows Embodiment 1 of invention, and FIG. 4 is a flowchart figure showing operation | movement of the heat exchange ventilation apparatus which shows Embodiment 1 of this invention. As shown in FIGS. 1 to 3, in the heat exchange ventilator 100, a heat exchanger 1 for exchanging heat between outdoor air and room air is installed in a main body casing 2 formed in a rectangular parallelepiped box shape. Ventilate the room while exchanging heat by supplying and exhausting air.

In the main body casing 2, outdoor air is sucked from the outdoor air inlet 11 by the air supply blower 3, and supplied to the room through the air supply passage 1 a (see FIG. 3) of the heat exchanger 1 from the indoor air outlet 12. An air passage 5 and an exhaust passage 6 that sucks room air from the indoor air inlet 13 by the exhaust fan 4 and exhausts the air from the outdoor air outlet 14 to the outside through the exhaust passage 1b (see FIG. 3) of the heat exchanger 1. Is formed.

Further, the heat exchanger 1, the air supply fan 3, and the exhaust air fan 4 are assembled in the main body casing 2, and the air supply path component 7, the exhaust path component 8, the air supply side inlet part 9, and the exhaust side inlet part 10 are mounted. Thus, an air supply path 5 and an exhaust path 6 are formed. The supply air blower 3 is provided with a motor 3a, and the exhaust blower 4 is provided with a motor 4a.

The air supply path 5 uses the opening of the main body casing 2 corresponding to the air supply side inlet component 9 as an outdoor suction port 11, and the heat exchanger 1 from the upper surface of the heat exchanger 1 through the air supply side inlet component 9. The air supply passage 1a is passed through the air supply blower 3 to the outlet portion 7a of the air supply path component 7, and the opening of the main casing 2 corresponding to the opening of the outlet portion 7a is formed as an air outlet 12 for the indoor side outlet 12. Is done.

On the other hand, the exhaust path 6 uses the opening of the main casing 2 corresponding to the exhaust side inlet part 10 as an indoor suction port 13, and exhausts the heat exchanger 1 from the exhaust side inlet part 10 to the upper surface of the heat exchanger 1. The exhaust fan 4 is connected to the outlet portion 8a of the exhaust passage component 8 through the passage 1b, and is formed as a ventilation passage having the opening of the main casing 2 corresponding to the opening of the outlet portion 8a as the outdoor outlet 14.

The bypass passage 15 is closed by the bypass damper 16 in front of the heat exchanger 1 upstream of the air supply path 5 and the bypass passage 15 side is opened by opening the bypass passage 15 side. The outdoor air is routed from the outlet portion 7a of the air supply path component 7 to the indoor outlet 12 via the supply air blower 3 through the bypass passage 15 by bypassing the heat exchanger 1 from the air supply side inlet component 9 from 11 It is formed as a ventilation path for supplying air.

On the outer side surface of the main casing 2, a duct connection cylinder 17 is attached to the outdoor inlet 11 and the indoor outlet 12 of the air supply passage 5 and the indoor inlet 13 and the outdoor outlet 14 of the exhaust passage 6. ing.

The heat exchange ventilator 100 configured in this manner supplies outdoor air through the heat exchanger 1 through the air supply path 5 into the room, and simultaneously exhausts indoor air through the heat exchanger 1 through the exhaust path 6. The heat exchanger 1 can perform heat exchange ventilation operation by simultaneous supply and exhaust while performing heat exchange between the supply and exhaust in the heat exchanger 1.

Further, by switching to the bypass passage 15 by the bypass damper 16, outdoor air can be supplied indoors without passing through the heat exchanger 1 by the air supply blower 3, and normal ventilation operation without heat exchange is performed. be able to.

In FIG. 2, the bypass passage 15 is provided near the side surface of the main casing 2, but may be provided at any position, near the other side surface, or on the upper surface side or lower surface side.

In the above embodiment, the bypass passage 15 is provided on the air supply passage 5 side. However, a bypass passage is also provided on the exhaust passage 6 side in accordance with the air supply side, and from the indoor inlet 13 of the exhaust passage 6. After passing through the exhaust side inlet part 10, the bypass damper may be switched to a bypass passage to bypass the heat exchanger 1, and the indoor air may be exhausted from the outlet part 8 a of the exhaust path part 8 to the outdoor outlet 14.

  The main body casing 2 is provided with a humidity sensor 18 capable of detecting the humidity of the outdoor air at the outdoor suction port 11, and the heat exchange ventilator 100 receives a detection signal from the humidity sensor 18 and an air supply blower 3 and a control device 19 for controlling the operation of the exhaust blower 4 and the bypass damper 16 are provided, and an external controller 20 such as a remote controller is connected to the control device 19 and controlled.

  Next, the operation will be described. The heat exchange ventilator 100 can be arbitrarily selected by the external controller 20 to turn on / off the ventilation operation (ON-OFF), the magnitude (strong / weak) of the ventilation air flow, and the type of ventilation (heat exchange ventilation operation or normal ventilation operation). It has become. When an operation switch (not shown) of the external controller 20 is turned ON, the air supply blower 3 and the exhaust blower 4 operate simultaneously, and the indoor air is sucked from the indoor side intake port 13, passes through the exhaust path 6, and is exhausted. The blower 4 blows out from the outdoor air outlet 14 and exhausts it to the outside of the room.

  In addition, outdoor air is sucked in from the outdoor suction port 11, passes through the air supply path 5, and is blown out from the indoor side air outlet 12 by the air supply blower 3 to be supplied into the room. At this time, heat exchange is performed between the supply air passing through the supply passage 1a and the exhaust passage 1b of the heat exchanger 1 and the exhaust air, and the total heat of the exhaust air is recovered into the supply air. Thus, by bringing the supply air close to the temperature of the exhaust air, the change in the total heat of the indoor air due to ventilation can be reduced, and the heating and cooling load can be reduced.

Next, an outline of the control will be described. The case where the heat exchange ventilation operation is selected by the external controller 20 will be described below.

FIG. 4 is a flowchart showing the control during the heat exchange ventilation operation. When the operation of the heat exchange ventilator 100 is started, the ventilation operation is performed based on the ventilation type (heat exchange ventilation operation or normal ventilation operation) and the air volume selected by the external controller 20 in step S1. In step S2, it is determined whether the ventilation type is heat exchange ventilation operation. If the ventilation type is heat exchange ventilation operation, the process proceeds to step S3. If the ventilation type is normal ventilation operation, the process returns to step S2. In step S3, it is determined whether or not the humidity R% of the outdoor air detected by the humidity sensor 18 is equal to or higher than a preset reference value Ra% (R ≧ Ra). In the present embodiment, Ra = 90% is set as a reference value Ra for determining whether the outdoor air has high humidity such as fog or haze. Therefore, if the outdoor air humidity R ≧ 90%, the process proceeds to step S4. If the outdoor air humidity R <90%, the process returns to step S3. In step S4, the timer 1 starts and proceeds to step S5. In step S5, it is determined whether the preset time Ta has elapsed. In this embodiment, Ta = 2 hours is set. Therefore, if two hours or more have elapsed, the process proceeds to step S6, and if less than two hours, the process proceeds to step S7.

In step S6, the bypass damper 16 is operated to close the passage to the heat exchanger 1 in the supply passage 5 and open the bypass passage 15 to change from the heat exchange ventilation operation to the normal ventilation operation, and at the same time, the supply blower 3 and the exhaust blower. 4 is rotated at a low speed to reduce the air volume to 20 to 80% of the air volume selected by the external controller 20, and the process proceeds to step S8. In step S8, it is determined whether the humidity R% of the outdoor air detected by the humidity sensor 18 is equal to or less than the reference value Rb = Ra-5% (R% <Rb (= Ra-5%)). By judging Ra-5%, if the outdoor air humidity R fluctuates around 90%, a 5% humidity difference will prevent frequent switching between heat exchange ventilation operation and normal ventilation operation. Is provided. Since Ra = 90% is set in this embodiment, the process proceeds to step S9 if R% <85%, and returns to the determination in step S8 if R% ≧ 85%. In step S9, the timer 2 is started, and the process proceeds to step S10. In step S10, it is determined whether or not the timer 2 has passed a preset time Tb. In this embodiment, Tb = 2 hours. Accordingly, if two hours or more have elapsed, the process proceeds to step S11, and if less than two hours, the process returns to the determination in step S10.

In step S11, the bypass damper 16 is operated again, the bypass passage 15 is closed, the passage to the heat exchanger 1 of the air supply passage 5 is opened, the normal ventilation operation is returned to the heat exchange ventilation operation, and the supply air blower 3 and the exhaust air blower 4 , And the air volume selected by the external controller 20 is returned. And it returns to determination of step S2. In step S7, it is determined whether or not the humidity R% of the outdoor air detected by the humidity sensor 18 is below the reference value Rb = Ra-5% (R% <Rb (= Ra-5%)). In this embodiment, Ra is set to 90%, so if R% <85%, the process returns to step S3, and if R% ≧ 85%, the process returns to step S5.

In the present embodiment, the supply air blower 3 and the exhaust air blower 4 are rotated at a low speed in step S5, and the supply air amount and the exhaust air amount are simultaneously reduced to 20 to 80% of the air amount selected by the external controller 20. Alternatively, only the supply air flow rate may be reduced by reducing only the supply air blower 3 at a low speed.

Further, although the air volume is reduced to 20 to 80% of the air volume selected by the external controller 20, the air volume notch selected by the external controller 20 among the air volume notches selectable by the external controller 20 as shown in FIG. One step less airflow notch (if notch is selected, medium notch is selected, and if medium notch is selected, weak notch is selected. The weakest notch is the smallest airflow notch of selectable airflow notches. If it is selected, it may be reduced to a weak notch), and as shown in FIG. 6, the minimum air volume notch that can be selected by the external controller 20 (from a strong notch to a weak notch, from a weak notch). The weak notch may be reduced to the weak notch), and the airflow notch has three steps of strong notch, medium notch and weak notch in this embodiment, but there are multiple steps. Well to the number of stages is not limited.

With the above-described configuration and operation, when the heat exchange ventilator 100 is in the heat exchange ventilation operation, even if the outdoor air is in a high humidity state, such as when a lot of fog or haze is generated, the humidity sensor 18 controls the humidity of the outdoor air. When it is determined that the value Ra is equal to or greater than the value Ra, the bypass damper 16 is automatically operated to switch to the normal ventilation operation in which the air supply path 5 does not pass through the heat exchanger 1 so that high humidity outdoor air does not pass through the heat exchanger 1. Therefore, moisture does not aggregate or condense in the heat exchanger section 1 and the heat exchanger 1 does not get wet with water, and it is possible to prevent the heat exchange performance of the heat exchanger 1 based on paper from being deteriorated. it can. At this time, since the ventilation is continuously performed only by switching from the heat exchange ventilation operation to the normal ventilation operation, it can be used even in a use environment that requires constant ventilation such as 24-hour ventilation.

Further, when the humidity sensor 18 determines that the humidity of the outdoor air is equal to or higher than the reference value Ra, the heat exchange ventilation operation is automatically switched to the normal ventilation operation, and the rotation speed of the supply air blower is reduced to reduce the supply air volume. Further, it is possible to continuously ventilate without stopping the ventilation itself while suppressing the inflow of high-humidity air into the room to some extent and suppressing an increase in humidity in the room.

In addition, when the outdoor air is automatically in a normal ventilation operation because the outdoor air has high humidity as described above, the humidity of the outdoor air decreases with time and the humidity of the outdoor air becomes less than the reference value Rb. Before automatically switching from normal ventilation operation to heat exchange ventilation operation, the rotation of the air supply and exhaust fans that had been reduced in normal ventilation operation is restored, and the air volume of supply and exhaust air can be switched to normal ventilation operation. Since the air volume at the time of the heat exchange ventilation operation (the air volume selected by the external controller 20) is restored, it is possible to automatically switch between the heat exchange ventilation operation and the ventilation ventilation operation according to the humidity of the outdoor air. This saves the trouble of managing the operation of the ventilator. In addition, since the reference value Rb = reference value Ra−5%, when the outdoor air humidity fluctuates in the vicinity of the reference value Ra, switching between the heat exchange ventilation operation and the normal ventilation operation is frequently performed according to a slight change. Therefore, it is possible to obtain a heat exchange ventilator that is easy to use.

Embodiment 2. FIG.
7 is a perspective plan view of a heat exchange ventilator showing a second embodiment of the present invention, FIG. 8 is a perspective side view of the heat exchange ventilator showing a second embodiment of the present invention, and FIG. It is a see-through | perspective side view of the bypass passage 15 of the heat exchange ventilation apparatus which shows Embodiment 2 of invention. As shown in FIG. 8, non-woven materials and air-permeable materials such as mesh are used on the supply air inlet side of the heat exchanger 1 in the air supply path 5 and on the exhaust air inlet side of the heat exchanger 1 in the exhaust path 6. As shown in FIG. 7, the bypass passage 15 is also provided with a dust removal filter 22 made of a breathable material such as a non-woven material or mesh over the entire cross section of each passage. Thus, dust and the like in the air passing through the air supply passage 5 and the bypass passage 15 are removed. Further, as shown in FIGS. 7 and 9, a dish-shaped drain container 23 capable of storing water is provided vertically below the dust removal filter 22 provided in the bypass passage 15, and the dust removal filter 22 and the drain container are provided. 23 can be easily cleaned and replaced from a maintenance port (not shown) provided in the main casing 2. The drain container 23 is provided with a water detection sensor 24 for detecting water accumulated in the drain container 23 at a certain level or higher. FIG. 10 is an external view of the external controller 20 connected to the outside of the heat exchange ventilator. In FIG. 10, the water level of the drain vessel 23 is placed in the vicinity of a switch that can arbitrarily select the on / off of the ventilation operation (ON-OFF), the magnitude (strong / weak) of the ventilation airflow, and the ventilation type (heat exchange ventilation operation or normal ventilation operation). A display unit 25 that indicates the situation is provided.

  FIG. 11 is a flowchart showing the operation control of the heat exchange ventilator by the water detection sensor 24. In FIG. 11, steps S1 to S6 are the same control as in the first embodiment, and thus the description thereof is omitted. In step S6, the bypass damper 16 is operated to change from the heat exchange ventilation operation to the normal ventilation operation. At the same time, the low-speed operation in which the supply air blower 3 and the exhaust blower 4 are rotated at a low speed is performed, and then the process proceeds to step S12. When the outdoor air is in a high humidity and normal ventilation operation, the high humidity outdoor air passes through the dust removal filter 22, so that moisture in the high humidity aggregates in the dust removal filter 22 and the dust removal filter 22 gets wet with water. . In the case of continuing for a long time, when water aggregation continues and exceeds the water retention capacity of the dust removal filter 22, water droplets drip from the dust removal filter 22 into the drain container 23. In step S12, when water accumulates in the drain container 23 and water accumulates above a certain level, the water detection sensor 24 detects water and proceeds to step S13. If no water is detected, the process proceeds to step S8.

In step S13, the detection signal of the water detection sensor 24 is input to the control device 19, and the operation of the supply air blower 3 and the exhaust air blower 4 is forcibly stopped to stop ventilation, and the external controller 20 recognizes the full water. The display unit 25 is turned on, a warning display for recognizing that the forced stop has occurred due to full water is performed, and the process proceeds to step S14. In step S14, it is determined whether or not the water detection sensor 24 has not detected water. If water has not been detected, the process proceeds to step S15. If water has been detected, the process proceeds to step S16. In step S15, the forced stop of the operation of the air supply blower 3 and the exhaust blower 4 is canceled and the operation is restarted, and the display unit 25 is turned off to stop the warning display, and the process proceeds to step S8. In step S16, it is determined whether the humidity R% of the outdoor air is equal to or less than the reference value Rb (= Ra-5%) (85% or less in the present embodiment), and is below the reference value Rb (85% or less in the present embodiment). If there is, the process proceeds to step S17, and if it exceeds the reference value Rb (in the present embodiment, exceeds 85%), the process returns to step S14.

In step S17, the forced stop of the operation of the air supply blower 3 and the exhaust blower 4 is released and the operation is restarted, and the lit display unit 25 is flashed and the forced stop is released, but it is full. A notice to that effect is displayed, and the process proceeds to step S18. In step S18, it is determined whether or not the detection sensor 24 has not detected water. If water has not been detected, the process proceeds to step S19. If water has been detected, the process returns to the determination in step S18. In step S19, the blinking display unit 25 is turned off to cancel the caution display, and the process proceeds to step S19.

In step S8, it is determined whether the humidity R% of the outdoor air detected by the humidity sensor 18 is equal to or less than a reference value Rb (= Ra-5%). Since Ra = 90% is set in this embodiment, the process proceeds to step S9 if R% <85%, and returns to the determination in step S12 if R% ≧ 85%. Steps 9 to 11 are the same as in the first embodiment. That is, in step S9, the timer 2 is started and the process proceeds to step S10. In step S10, it is determined whether or not the timer 2 has passed a preset time Tb. In this embodiment, Tb = 2 hours. Accordingly, if two hours or more have elapsed, the process proceeds to step S11, and if less than two hours, the process returns to the determination in step S10. In step S11, the bypass damper 16 is operated again, the bypass passage 15 is closed, the passage to the heat exchanger 1 of the air supply passage 4 is opened, and the normal ventilation operation is returned to the heat exchange ventilation operation. The rotation of the blower 5 is increased and the air volume selected by the external controller 20 is returned. And it returns to determination of step S2. Other configurations and operations are the same as those in the first embodiment.
In the above embodiment, the display unit 25 is turned on to indicate a warning display, and the display unit 25 blinks to indicate a caution display. However, the warning display and the caution display are separately displayed. A portion may be provided to light up.

  According to the configuration and operation described above, the same effects as in the first embodiment can be obtained, and clean ventilation air can be supplied into the room by the dust removal filter 22 even during normal ventilation operation, and the outdoor air has high humidity. In this case, even if water aggregates on the dust removal filter 22 and drops of water drip from the dust removal filter 22, the water can be stored in the drain container 23. Since the detection sensor 24 detects full water and stops the operation of the supply air blower 3 and the exhaust air blower 4 to forcibly stop the operation of the heat exchange ventilator, water overflows from the drain container 23 and the heat exchange ventilator No water leaks outside. Further, even if high humidity outdoor air such as mist or haze is supplied, the water can be removed to some extent by agglomerating with the dust removal filter 22 to suppress the increase in indoor humidity. be able to.

At that time, a warning is displayed on the external controller 20 to indicate that the operation has been stopped forcibly because there is a risk of overflowing the water when the drain container 23 is full and the operation is continued. The user can know the reason why the ventilator is shut down forcibly, and there is no misunderstanding that the ventilator is shut down due to a malfunction.

Further, when the water level of the drain container 23 falls and the water detection sensor 24 stops detecting water, or when the humidity of the outdoor air decreases and the humidity becomes less than the reference value Rb, the air is agglomerated by the dust removal filter 22 by supplying air. Since water is no longer generated and dripped, there is no fear of water overflowing from the drain container 23, and the forced operation stop of the heat exchange ventilator is automatically canceled and the operation is resumed. There is no need for a person to bother driving again.

Further, since the water detection sensor 24 detects water and stops the operation of the supply blower 3 and the exhaust blower 4, the humidity of the outdoor air is less than the predetermined reference value Rb while the water detection sensor 24 detects water. Then, the forced operation stop of the air supply blower 3 and the exhaust blower 4 is canceled, and the normal ventilation operation is restarted for a certain time or until the water detection sensor 24 detects no water. When the detection sensor 24 stops detecting water, the normal ventilation operation is returned to the heat exchange ventilation operation. Therefore, the water in the drain container 23 can be forcibly evaporated by ventilation, and the drain container 23 can be evaporated in a short time. Reduce water and get out of a dangerous full condition.

Even if it is not step S13, if drain water accumulates in the drain container 23 regardless of the step and the water detection sensor 24 detects water, a caution display that the drain container 23 is full is displayed on the external controller 20. By doing so, the user can voluntarily adjust or stop the operation of the heat exchange ventilator 100.

Further, the heat exchanger 1 is provided with a very large cross-sectional area in the air supply path 5 in order to increase heat exchange efficiency and reduce pressure loss. In order to suppress the pressure loss of the entire air supply path 5 as much as possible, the dust removal filter 21 is not provided in the outdoor suction port 11 and is disposed in the vicinity of the heat exchanger 1 having the largest cross-sectional area of the passage. It is necessary to suppress the increase in pressure loss due to the filter 21 as much as possible. In that case, in the normal ventilation operation through the bypass passage 15, the dust removal filter 21 is not passed, so the dust removal filter 22 is provided in the bypass passage 15. Even if the dust removal filter 22 in the bypass passage 15 is smaller in size than the dust removal filter 21 and increases the pressure loss by a corresponding amount, the heat exchanger 1 has a large pressure loss in normal ventilation operation. Since it does not pass, it can be suppressed as a pressure loss of the entire air supply path 5. Therefore, it is possible to remove and clean the outside air in the heat exchange ventilation operation and the normal ventilation operation without increasing the cross-sectional area of the outdoor suction port 11 and the bypass passage 15, and in the heat exchange ventilation operation and the normal ventilation operation. The pressure loss of the entire air supply path at the time can be made closer to each other, and the difference in the air supply air volume during heat exchange ventilation operation and normal ventilation operation can also be reduced.

Embodiment 3 FIG.
FIG. 12 is a transparent side view of the bypass passage 15 of the heat exchange ventilation apparatus 100 showing Embodiment 3 of the present invention. A drain pipe 26 for draining the water in the drain container 23 to the outside of the heat exchange ventilator is connected to the drain container 23, and the other end of the drain pipe 26 is provided to the outside of the main body casing 2. The other end of the drain pipe 26 is connected to a drain pipe (not shown) provided in the building when the heat exchange ventilator 100 is installed. Except for the above, the configuration and operation are the same as those of the second embodiment.

  According to the above configuration and operation, the same effect as in the first and second embodiments is obtained, and the water in the drain container 23 is automatically drained, so that the outside air is in a high humidity state for a long time. Even if it continues, the occurrence of a situation where the drain container 23 becomes full and must be forcibly stopped can be eliminated, and the ventilation can be maintained continuously, so it can be used even in an environment where constant ventilation is required. it can.

  There is a possibility of industrial use in a simultaneous air supply and exhaust type heat exchange ventilator that performs ventilation by exchanging indoor and outdoor air.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 1a Supply passage 1b Exhaust passage 2 Main body casing 3 Supply blower 4 Exhaust blower 3a Motor 4a Motor 5 Supply passage 6 Exhaust passage 7 Supply passage component 8 Exhaust passage component 7a Exit portion 8a Exit portion 9 Supply air Side inlet part 10 Exhaust side inlet part 11 Outdoor air inlet 12 Indoor air outlet 13 Indoor air inlet 14 Outdoor air outlet 15 Bypass passage 16 Bypass damper 17 Duct connection cylinder 18 Humidity sensor 19 Controller 20 External controller 21 For dust removal Filter 22 Dust removal filter 23 Drain container 24 Water detection sensor 25 Display unit 26 Drain pipe 100 Heat exchange ventilator

Claims (9)

An air supply passage that is housed in the casing, sucks outdoor air from the outdoor suction port by the air supply blower, and supplies the air from the indoor air outlet to the room through the air supply passage of the heat exchanger, and from the indoor air intake port by the exhaust air blower. Humidity that sucks indoor air and exhausts it from the outdoor outlet through the exhaust passage of the heat exchanger to the outside of the room, and humidity that measures the humidity of the outdoor air that is installed in the air supply passage upstream of the heat exchanger A sensor, a bypass passage that is arranged in parallel with the air supply passage, bypasses the heat exchanger, a damper that switches between the air supply passage and the bypass passage, and the air supply blower, the exhaust blower, and the damper are controlled. A control device, and the control device is configured to measure the humidity of outdoor air measured by the humidity sensor when the damper is in a heat exchange ventilation operation state in which the bypass passage is closed and the air supply passage is opened. There predetermined to not less than the reference value Ra, the heat exchange ventilator, characterized in that switching to ordinary ventilation operation in which the damper is open the bypass passage side closing said air supply passage. When the humidity of the outdoor air measured by the humidity sensor in the state of heat exchange ventilation operation is equal to or higher than the predetermined reference value Ra, the normal ventilation operation in which the damper closes the air supply passage and opens the bypass passage side. When the outdoor air humidity measured by the humidity sensor becomes lower than a predetermined reference value Rb during the normal ventilation operation, the damper closes the bypass passage and opens the air supply passage to perform normal ventilation. The heat exchange ventilator according to claim 1, wherein the heat exchange ventilator operation is returned from the operation. When the humidity of the outdoor air measured by the humidity sensor in the state of heat exchange ventilation operation is equal to or higher than the predetermined reference value Ra, the normal ventilation operation in which the damper closes the air supply passage and opens the bypass passage side. 2. The heat exchange ventilator according to claim 1, wherein the air supply blower is lowered to reduce the air volume of the supply air. When the humidity of the outdoor air measured by the humidity sensor in the state of heat exchange ventilation operation is equal to or higher than the predetermined reference value Ra, the normal ventilation operation in which the damper closes the air supply passage and opens the bypass passage side. When the humidity of the outdoor air measured by the humidity sensor during the normal ventilation operation is less than a predetermined reference value Rb, the rotation of the supply air blower is further reduced to reduce the air volume of the supply air. The damper closes the bypass passage and opens the air supply passage to return to the heat exchange ventilation operation, and at the time of the heat exchange ventilation operation before raising the rotation of the air supply blower and switching the air volume of the air supply to the normal ventilation operation. The heat exchange ventilator according to claim 1, wherein the air volume is returned to the air volume. A heat exchange ventilation comprising a filter provided in the bypass passage, a drain container provided at a lower portion of the filter, and a water detection sensor for detecting water in the drain container provided in the drain container. When the humidity of the outdoor air measured by the humidity sensor in the operation state is equal to or higher than the predetermined reference value Ra, the damper is switched to the normal ventilation operation in which the air supply passage is closed and the bypass passage is opened. The heat exchange ventilator according to any one of claims 1 to 4, wherein when the water detection sensor detects water during the normal ventilation operation, the operation of the air supply blower is stopped. When the water detection sensor detects water and stops the operation of the supply air blower, if the water detection sensor stops detecting water, the operation of the supply air blower is canceled and restarted. The heat exchange ventilator according to claim 5, wherein When the water detection sensor detects water and stops the operation of the air supply blower, if the humidity of the outdoor air measured by the humidity sensor becomes less than a predetermined reference value Rb, the operation of the air supply blower is stopped. The heat exchange ventilation according to any one of claims 5 to 6, wherein the suspension is released and the operation is restarted, and the damper closes the bypass passage and opens the air supply passage to return to the heat exchange ventilation operation. apparatus. When the water detection sensor detects water and stops the operation of the air supply blower, if the humidity of the outdoor air measured by the humidity sensor becomes less than a predetermined reference value Rb, the operation of the air supply blower is stopped. The suspension is released and normal ventilation operation is resumed for a certain period of time or until the water detection sensor no longer detects water, and after a certain period of time or when the water detection sensor stops detecting water, the damper is The heat exchange ventilator according to any one of claims 5 to 6, wherein the air supply passage is opened and the normal ventilation operation is returned to the heat exchange ventilation operation. An external controller for controlling the operation of the heat exchange ventilator, a water level detection sensor provided in the drain pan or the drain tank, and when the water level detection sensor detects that water has accumulated above a predetermined water level, the external controller The heat exchange ventilator according to any one of claims 5 to 8, wherein the controller is provided with a display unit that informs the user of the accumulated water by voice or display.

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