JPH0748019B2 - Heat exchange ventilation air conditioner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange ventilation air conditioner that simultaneously performs ventilation of a building and air conditioning for heating and cooling.

2. Description of the Related Art In recent years, a ventilation air conditioner with a small heat loss that introduces exhaust heat into a supply airflow by passing the exhaust airflow and the supply airflow through a heat exchanger has become mainstream.

The structure of a conventional heat exchange ventilation air conditioner of this type will be described with reference to FIG. As shown in the figure, the main body 1 of the heat exchange ventilation air conditioning unit has an indoor return air duct 2 inside.
To the indoor air supply duct 4 from the branch pipe 3 through the duct 2a
To the indoor air supply duct 4 from the outdoor air supply duct 6, and an exhaust passage from the indoor return air duct 2 to the outdoor exhaust duct 8 through the duct 2b by the branch pipe 3. 9 is divided into sections, a heat exchanger 10 is provided at the intersection of the air supply passage 7 and the exhaust passage 9, and the air supply passage 7 has a downstream side of the heat exchanger 10, that is, a downstream side of the circulation passage 5. Indoor blower 11 and heat exchange coil 12 for heating and cooling
And an exhaust blower 13 is provided in the exhaust passage 9 upstream of the heat exchanger 10. And one of the many rooms 14
The indoor air supply duct 4 and the indoor return air duct 2 are communicated with each other to perform ventilation and cooling / heating, and the toilet 15 which is the other room is provided with an exhaust blower 16 to communicate with the outside through the exhaust duct 8a. The bathroom 17 has an exhaust blower 18 and an exhaust duct.
8b, washroom 19 is equipped with exhaust blower 20 and exhaust duct 8c
Is in communication with. These exhaust ducts 8a, 8b and 8c are connected to the collective exhaust duct 8d by a connecting portion 21a. The collective exhaust duct 8d is connected to the outdoor exhaust duct 8 by the connecting portion 21b together with the exhaust passage 9 of the heat exchange ventilation air conditioning unit. Further, a backflow prevention shutter 22b is provided on the upstream side of the collective exhaust duct 8d on one upstream side of the connecting portion 21b,
A backflow prevention shutter 22a is also provided on the other upstream side of the exhaust passage 9.

Next, the operation will be described. When the exhaust blower 13 is operated, the indoor air RA is exhausted from the indoor return air duct 2 through the branch pipe 3 through the duct 2b, the heat exchanger 10 and the outdoor exhaust duct 8 to the outside as shown by the arrow. When the indoor blower 11 is operated, the outdoor air OA exchanges heat with the indoor air RA by passing through the heat exchanger 10 from the outdoor air supply duct 6 as shown by the arrow, and passes through the duct 2a into the main body 1. After being mixed with the indoor air RA that has entered, it is heated or cooled by the heat exchange coil 12 and then heated by the indoor air supply duct 4 to the room 14
To be charged. The exhaust blower 16 exhausts and ventilates the air in the toilet 15 from the connecting portion 21a to the collective exhaust duct 8d by the exhaust duct 8a and to the outdoor by the outdoor exhaust duct 8. Similarly, the exhaust blower 18 exhausts the air in the bathroom 17 from the exhaust duct 8b to the outside through the connecting portion 21a, the collective exhaust duct 8d, and the outdoor exhaust duct 8 to ventilate the air. In addition, the exhaust blower 20 is
The air inside 19 is exhausted from the exhaust duct 8c to the outside by the collective exhaust duct 8d from the connecting portion 21a and the outdoor exhaust duct 8 for ventilation.

Further, during the operation of the exhaust blower, the backflow prevention shutter 22a of the exhaust passage 9 of the main body 1 is closed, so that the exhaust containing the odor from the toilet 15 does not flow into the room 14. On the contrary, when the exhaust blowers 16, 18, 20 in each small room are stopped, the backflow prevention shutter 22b of the collective exhaust duct 8d is closed, and the exhaust air from the main body 1 does not flow back. Further, when the heat exchange ventilation air conditioning unit and the exhaust blower are stopped, the backflow prevention shutter 22a and the backflow prevention shutter 22b are closed, so that the backflow of outside air, humidity and odor can be prevented.

Problems to be Solved by the Invention In such a configuration of the conventional heat exchange ventilation air conditioning system, the heat exchange ventilation air conditioning unit and the exhaust blowers 16, 18, 20 are operated in the outdoor exhaust duct 8 regardless of the operating states. The flow of air can be prevented, but when the heat exchange ventilation air conditioning unit is operating and the exhaust blowers 16, 18, 20 are stopped, the air flow from the toilet 15, washroom 19 and bathroom 17 to the other room 14 Will be easier to migrate. This is the other room 14 but the toilet 1
This is because the negative pressure is higher than that of the washroom 19 and the bathroom 17, which causes the transfer of odors and humidity, which poses a sanitary problem. Also heat exchange ventilation air conditioning unit and exhaust blower 1
When 6,18,20 are operating, the balance of air supply and exhaust is disturbed by the amount of exhaust air from exhaust blowers 16,18,20, and the indoor becomes negative pressure compared to the outdoor, so that the draft air intrudes from the outdoor. However, there was a problem in comfort and energy saving.

The present invention solves the above problems and prevents migration of moisture and odor to other rooms. Another object of the present invention is to provide a heat exchange ventilation air conditioner that maintains a comfortable indoor living environment by preventing the entry of drafts.

Means for Solving the Problems In order to solve this problem, the present invention provides an air supply passage from an outdoor air supply duct to a room through a heat exchanger, an indoor blower and a heat exchange coil, and an indoor return air duct to the outside. An outdoor exhaust duct of a heat exchange ventilation air conditioning unit having an exhaust passage extending from the exhaust blower and the heat exchanger to an outdoor exhaust duct, and a circulation passage extending from the indoor return air duct to the indoor blower; A connecting portion A for collectively connecting the exhaust ducts of the exhaust blowers provided in each of the rooms, and the connecting portion A
From the exhaust pipe, a connecting portion B connecting the exhaust passage and the collective exhaust duct to join the outdoor exhaust duct, and the heat exchange ventilation air conditioning unit in the exhaust passage upstream of the connecting portion B. Is provided with a backflow prevention shutter A that closes the exhaust passage, and the collective exhaust duct is provided with a backflow prevention shutter B that closes the collective exhaust duct when the exhaust blower is stopped. The blower is configured to include control means for increasing the air volume of the indoor blower of the heat exchange ventilation air conditioning unit, in addition to the circuit that operates in conjunction, the first means is the The heat exchange ventilation air conditioning unit is provided with a differential pressure detecting means for detecting a pressure difference from the outdoor pressure, and the differential pressure obtained by the pressure detecting means is always large on the indoor side with a constant pressure difference. Is obtained by a configuration in which a control means for increasing the air volume of internal use blower.

The second means is provided with an indoor pressure detecting means for detecting the pressure in the room and a small room pressure detecting means for detecting the pressure of each of the plurality of small chambers, and the pressure between the indoor pressure and the small room pressure is provided. The heat exchange ventilation air conditioning system is provided with a calculating means for calculating a difference, and the calculating means always keeps the indoor pressure higher than the respective pressures of the plurality of small chambers regardless of whether or not the exhaust blower is operated. The configuration is provided with control means for increasing the air volume of the indoor blower of the unit.

A third means is provided with a human body detecting means for detecting the presence or absence of a person in each room, and a calculating means for calculating the number of persons in the room by the human body detecting means, and further calculating a circulating air volume. The configuration is provided with control means for changing the air volume of the indoor blower and the air volume of the exhaust blower of the exchange ventilation air conditioning unit.

A fourth means calculates a human body detecting means for detecting the presence or absence of a person in each room in the room, and the number of personnel present in each room in the room by the human body detecting means, and supplies the total circulating air volume and the air supply to each room. Control means for changing the air volume of the indoor blower of the heat exchange ventilation air conditioning unit and the air volume of the exhaust blower by the calculation means, and a damper is provided in each indoor air supply duct. The control means for controlling the change of the supply air volume is provided.

A fifth means is provided with an odor detecting means for detecting an odor in one of the plurality of small rooms and a detecting means for detecting humidity in two of the other small rooms. When a odor of a certain amount or more is detected by the above, or when a humidity of a certain amount or more is detected by the humidity detecting means, in addition to operating the exhaust blowers of the plurality of small rooms in conjunction, The configuration is provided with a control unit that increases the air volume of the blower.

By the configuration of the first means, when the heat exchange ventilation air conditioning unit and the exhaust blower are operating, the balance between supply and exhaust is deviated by the exhaust air volume of the exhaust blower, and the indoor pressure and the outdoor pressure The differential pressure detection means for detecting the pressure difference between the indoor and outdoor sides detects that the indoor pressure becomes lower than the outdoor pressure, and the control means increases the air volume of the indoor blower of the heat exchange ventilation air conditioning unit by the input signal. It is possible to prevent the inflow of draft air from the outside by controlling the differential pressure of (1) so that the inside is always large with a constant pressure difference.

With the configuration of the second means, when the heat exchange ventilation air conditioning unit is operating and the exhaust blower is stopped, the pressure in the room having the air supply and exhaust ports of the heat exchange ventilation air conditioning unit and the exhaust air The pressure in a small room having a blower exhaust port, for example, a small room such as a toilet, a washroom, or a bathroom, is detected by the indoor pressure detection means and the small room pressure detection means, and the indoor pressure is calculated by the calculation means. By calculating the difference with the pressure for the small room, the room becomes a negative pressure compared to the pressure of the small room, the control means increases the air volume of the indoor blower of the heat exchange ventilation air conditioning unit based on the input signal, It is possible to prevent the transfer of odor and humidity from the toilet, washroom and bathroom to other rooms (indoors) by controlling the indoor and outdoor differential pressures so that the indoor side is always large with a constant pressure difference. .

With the configuration of the third means, when the heat exchange ventilation air conditioning unit is operating, the human body detecting means provided in each room in the room for detecting the presence or absence of the person detects the person, and the calculating means detects the number of persons in the room. By calculating the ventilation volume and the circulating air volume, the control means changes the air volume of the indoor air blower and the air volume of the exhaust air blower of the heat exchange ventilation air conditioning unit based on the input signal to control the indoor ventilation and air conditioning. By using the optimum supply air volume, it is possible to prevent useless energy.

According to the configuration of the fourth means, when the heat exchange ventilation air conditioning unit is operating, the human body detecting means provided in each room in the room for detecting the presence or absence of the person detects the person, and the calculating means exists in each room. By calculating the number of people in the room and further calculating the ventilation volume and the circulating air volume, the control means changes the air volume of the indoor blower and the air volume of the exhaust blower of the heat exchange ventilation air conditioning unit based on the input signal. By adjusting the opening degree of the damper installed in each room air supply duct, the air volume of the air supply suitable for the personnel in each room can be supplied to each room, thereby providing ventilation and air conditioning in the room. It is possible to improve the comfort and prevent the use of wasted energy by performing the air conditioning with the optimum air supply amount according to the personnel.

With the configuration of the fifth means, when the heat exchange ventilation air conditioning unit is operating, and the odor detection means installed in a small room having an intake port of an exhaust blower, for example, a toilet, detects an odor of a certain concentration or more, or When the humidity detecting means installed in the washroom or bathroom detects humidity above a certain level, the control means operates the blower for exhaust of the toilet, washroom and bathroom in conjunction with the input signal, and the heat exchange ventilation air conditioning unit Control to increase the air volume of the indoor blower,
This will prevent the entry of drafts from the outside.

Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIG. The same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, a differential pressure sensor 23a, 23b for detecting the differential pressure between the indoor and outdoor is installed, the pressure inside the room is larger than the outdoor by a constant pressure difference based on the input signals of these differential pressure sensors 23a and 23b. Therefore, the control means 24 for increasing the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 is provided.

The operation of the above structure will be described. The indoor air RA is supplied from the indoor return air duct 2 by the exhaust blower 13 to the indoor exhaust air duct 8 via the branch pipe 3 via the duct 2b and the heat exchanger 10 as shown by the arrow. Exhausted to the outside. When the indoor blower 11 is operated, the outdoor air OA exchanges heat with the indoor air RA by passing through the heat exchanger 10 from the outdoor air supply duct 6 as shown by the arrow, and passes through the duct 2a into the main body 1. After mixing with the incoming room air RA, the heat exchange coil
It is heated or cooled by 12 and is supplied to the room 14 by the indoor air supply duct 4. The exhaust blower 16 exhausts the air in the toilet 15 from the outdoor exhaust duct 8a to the outdoor by the collective exhaust duct 8d from the connecting portion 21a and the outdoor exhaust duct 8. Similarly, the exhaust blower 18 exhausts the air in the bathroom 17 from the exhaust duct 8b to the outside through the connecting portion 21a, the collective exhaust duct 8d, and the outdoor exhaust duct 8 to ventilate the air. Exhaust blower 20
The air in the washroom 19 is exhausted from the exhaust duct 8c through the connecting portion 21a to the collective exhaust duct 8d and the outdoor exhaust duct 8 to ventilate the room. At this time, the backflow prevention shutter 22b of the exhaust duct 8d on the upstream side of the connecting portion 21b and the backflow prevention shutter 22a of the exhaust passage 9 of the main body 1 are closed, so that exhaust gas containing odor from the toilet 15 flows into the room 14. To prevent. On the contrary, when the exhaust blowers 16, 18, 20 in each small room are not in operation, the backflow prevention shutter 22a of the collective exhaust duct 8d is closed, and the backflow of exhaust air from the main body 1 is also prevented. Further, when the heat exchange ventilation air conditioning unit 1 and the exhaust blower 13 are operating, the balance between supply and exhaust is deviated by the exhaust air volume of the exhaust blower 13, and the pressure difference between the indoor pressure and the outdoor pressure is detected. The differential pressure sensors 23a and 23b detect that the indoor pressure is lower than the outdoor pressure, and based on the input signals of the differential pressure sensors 23a and 23b, the control means 24 controls the indoor pressure to be a constant pressure difference compared to the outdoor pressure. The control is performed so as to increase the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 so as to increase.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals,
Detailed description thereof will be omitted. In the heat exchange ventilation air conditioner, the indoor pressure sensor 25 that detects the indoor pressure and the toilet
15, a pressure sensor 26a, 26b and 26c for small rooms that detect the pressure of each of the bathroom 17, 17 and toilet 19, and calculate the pressure difference between the room pressure and the pressure of the toilet 15, bathroom 17, and toilet 19 A means 27 is provided, and the calculation means 27 ensures that the room pressure is always 15, regardless of whether or not the exhaust blower is operating.
A control means 28 is provided for increasing the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 so that the pressures become larger than the respective pressures in the bathroom 17 and the washroom 19.

The operation in the above configuration will be described. When the heat exchange ventilation air conditioning unit 1 is operating and the exhaust blower 13 is stopped, the pressure in the room having air supply and exhaust ports of the heat exchange ventilation air conditioning unit 1 is reduced. And the room pressure sensor 25 for the pressure in any one of the toilet 15, washroom 17 and bathroom 19.
And the small room pressure sensors 26a, 26b and 26c, and the calculation means 27 calculates the differential pressure between the room pressure and one of the small room pressures to determine whether the room is at a negative pressure compared to the small room pressure. For example, the control means 28 controls on the basis of the input signal so as to increase the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1.

Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, a human body detection sensor 29 that detects the presence or absence of a person by infrared rays in each room, and a calculation means that calculates the number of people in the room by the human body detection sensor 29 and further calculates the ventilation air volume and the circulating air volume.
The calculation means 30 is provided with a control means 31 for changing the air volumes of the indoor blower 11 and the exhaust blower 13 of the heat exchange ventilation air conditioning unit 1.

The operation of the above configuration will be described. When the heat exchange ventilation air conditioning unit 1 is operating, the human body detection sensor 29 that detects the presence or absence of a person in each room in the room detects the person, and the calculation means 30 determines whether the person in the room is in the room. Calculate personnel. It is assumed that the human body detection sensor 29 detects that there are currently five people living in the room. Assuming that the required ventilation volume per person is 20 m ³ / h, the ventilation air volume is
Determine 100 m ³ / h. Calculate the circulating air flow rate as 5 times the intake amount of outside air and determine 500 m ³ / h. The control means 31 is an indoor blower of the heat exchange ventilation air conditioning unit 1 based on the input signal.
The air volume of 11 is controlled to 500 m ³ / h and the air volume of the exhaust blower 13 is controlled to 100 m ³ / h.

Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the third embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, a human body detection sensor 29 for detecting the presence or absence of a person in each room,
The human body detection sensor 29 is used to calculate the number of personnel present in each room, and the calculation means 32 is provided for calculating the ventilation volume, the total circulating air volume, and the air volume supplied to each room. Control for changing the air volume of the exhaust blower 13 of the ventilation air conditioning unit 1 and the air volume of the indoor blower 11, and for controlling the damper 33 provided in each indoor air supply duct to change the air supply air volume Means 34 are provided.

The operation of the above configuration will be described. When the heat exchange ventilation air conditioning unit 1 is operating, the human body detection sensor 29 that detects the presence or absence of a person in each room in the room detects the person, and the calculation means 32 causes each room to be detected. Calculate the number of people in the room and calculate the ventilation volume and total circulating air volume. Further, by calculating the supply air volume of each room, the control means 34 changes the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 based on the input signal, and the damper provided in each indoor air supply duct. The opening degree of 33 is adjusted to control the amount of air supplied to each room. Next, a fifth embodiment of the present invention will be described.
Description will be given with reference to the drawings. The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, the toilet 15 is equipped with an odor detection sensor 35 for detecting odors, the toilet 17 and the bathroom 19 are equipped with a humidity detection sensor 36 for detecting humidity, and the odor detection sensor 35 provides a certain odor, for example, methyl. Merccaptan threshold is 0.10.
When 4 ppb or more, or when the ammonia detects a threshold value of 149 ppb or more, or when the humidity detection sensor 36 detects a certain level of humidity, for example, a relative humidity of 60% or more,
In addition to operating the exhaust blowers 16, 18 and 20 in an interlocking manner, a control means 37 for increasing the air volume of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 is provided.

To explain the operation in the above configuration, the heat exchange ventilation air conditioning unit is operating, and the odor detection sensor in the toilet 15
When 35 detects an odor of a certain concentration or higher, or when the humidity detecting sensor 36 of the washroom 17 and the bathroom 19 detects a humidity of a certain amount or more, the control means 37 uses the input signal of the exhaust blowers 16, 18 and In addition to the interlocking operation of 20, the air exchange of the indoor blower 11 of the heat exchange ventilation air conditioning unit 1 is controlled to be increased.

As described above, according to the heat exchange ventilation air conditioner of the embodiment of the present invention, the pressure difference sensor detects the pressure difference between the indoor pressure and the outdoor pressure.
By detecting by 23a and 23b, it is detected that the indoor becomes negative pressure as compared with the outdoor, and based on this input signal, the heat exchange ventilation air conditioning unit 1 so that the indoor pressure becomes larger than the outdoor with a constant pressure difference. The control means 24 controls so as to increase the air volume of the indoor blower 11 to prevent drafts from the outside.

When the heat exchange ventilation air conditioning unit 1 is operating and the exhaust blower 13 is stopped, the pressure in the room having the air supply and exhaust ports of the heat exchange ventilation air conditioning unit 1 is measured by the indoor pressure sensor 25 and the toilet 15 , Pressure sensor 26a, 26b and 2 for small rooms
6c, indoors, toilet 15, washroom 17 and bathroom
The differential pressure in one of the rooms 19 is controlled by the control means 28 so that the indoor side is always large with a constant pressure difference, and the toilet 15,
It is possible to prevent the transfer of odor and humidity from the washroom 17 and the bathroom 19 to another room (room).

When the heat exchange ventilation air conditioning unit is operating, the human body detection sensor 29 that detects the presence or absence of a person in each room in the room detects the person, and the calculation means 30 calculates the ventilation volume and the circulating air volume from the indoor personnel. By doing so, the control means 31 changes the air volume of the indoor blower 11 and the air volume of the exhaust blower 13 of the heat exchange ventilation air conditioning unit 1 based on the input signal, and adjusts the ventilation and air conditioning of the room to the number of people living. By doing so with the optimum air volume, it is possible to prevent the use of wasted energy.

In addition, when the heat exchange ventilation air conditioning unit is operating, the human body detection sensor 29 that detects the presence or absence of a person in each room in the room detects the person, and the calculation means 32 calculates the number of people present in each room. Then, by calculating the total ventilation amount and the total circulation air amount, the control means 34 based on the input signal, the air amount of the exhaust blower 13 and the indoor blower 11 of the heat exchange ventilation air conditioning unit 1.
By adjusting the opening of the damper 33 installed in each room air supply duct while changing the air flow rate of each room, it is possible to supply each room with a supply air volume suitable for the personnel in each room. By doing so, ventilation and air conditioning in the room can be performed with the optimum air supply volume according to the personnel living in each room, thereby further improving comfort and preventing wasteful energy consumption. Is.

Also, when the heat exchange ventilation air conditioning unit 1 is operating and the odor detection sensor 35 installed in a small room having the exhaust ports of the exhaust blowers 16, 18, and 20, for example, the odor detection sensor 35 installed in the toilet 15, detects an odor of a certain concentration or more. Alternatively, when the humidity detection sensor 36 installed in the washroom or bathroom detects humidity above a certain level, the control means 37 causes the exhaust blower to respond to the input signal.
In addition to the interlocking operation of 16, 18 and 20, the indoor air blower 11 of the heat exchange ventilation air conditioning unit 1 is controlled so as to increase its air volume, thereby preventing the entry of draft air from the outside.

EFFECTS OF THE INVENTION As is clear from the above embodiments, according to the present invention, it is possible to prevent the odor generated from the toilet and the humidity generated from the bathroom from being transferred to the room that becomes the living space, and the draft air can enter. Since this can be prevented, it is possible to provide a heat exchange ventilation air conditioner capable of maintaining a comfortable indoor living environment.

[Brief description of drawings]

FIG. 1 is a block diagram of the heat exchange ventilation air conditioner of the first embodiment of the present invention, FIG. 2 is a block diagram of the heat exchange ventilation air conditioner of the same second embodiment, and FIG. FIG. 4 is a block diagram of the heat exchange ventilation air conditioner, FIG. 4 is a block diagram of the heat exchange ventilation air conditioner of the fourth embodiment, and FIG. 5 is a block diagram of the heat exchange ventilation air conditioner of the fifth embodiment. FIG. 4 is a configuration diagram of a conventional heat exchange ventilation air conditioning system. 1 ... Main body, 2 ... Indoor return air duct, 8 ... Outdoor exhaust duct, 8d ... Common exhaust duct, 9 ... Exhaust passage, 10 ...
Heat exchanger, 11 ... indoor blower, 12 ... heat exchange coil,
13,16,18,20 …… Blower for exhaust, 21a, 21b …… Connecting part, 22
a, 22b …… Backflow prevention shutter, 23a, 23b …… Differential pressure sensor, 24,28,31,34,37 …… Control means, 25 …… Indoor pressure sensor, 26a, 26b, 26c …… Small room pressure Sensor, 27,30,3
2 …… Calculation means, 29 …… Human body detection sensor, 33 …… Damper, 35 …… Odor detection sensor, 36 …… Humidity detection sensor.

Claims (6)

[Claims] 1. An air supply passage extending from an outdoor air supply duct to a room through a heat exchanger, an indoor blower and a heat exchange coil, and an outdoor exhaust air duct from an indoor return air duct and the heat exchanger to an outdoor exhaust duct. And an outdoor exhaust duct of a heat exchange ventilation air conditioning unit provided with a circulation passage from the indoor return air duct to the indoor blower, and an exhaust duct of an exhaust blower provided in each of a plurality of small rooms. A connecting part A for collective connection, a collective exhaust duct extending from the connecting part A, a connecting part B for connecting the exhaust passage and the collective exhaust duct to join the outdoor exhaust duct, and the connecting part B.
A backflow prevention shutter A that closes the exhaust passage when the heat exchange ventilation air conditioning unit is stopped is provided in the exhaust passage on the upstream side of the exhaust duct, and the collective exhaust duct includes the collective exhaust duct when the exhaust blower is stopped. A heat exchange ventilation provided with a backflow prevention shutter B for closing the air conditioner, and a control means for increasing the air volume of the indoor air blower of the heat exchange ventilation air conditioning unit, in addition to the circuit in which the plurality of exhaust air blowers operate in conjunction with each other. Air conditioner. 2. A differential pressure detecting means for detecting a pressure difference between the pressure inside the room and the pressure outside the room, so that the differential pressure obtained by the pressure detecting means is always large on the indoor side with a constant pressure difference. The heat exchange ventilation air conditioner according to claim 1, further comprising control means for increasing the air volume of the indoor blower of the heat exchange ventilation air conditioning unit. 3. A pressure difference between the room pressure and the small room pressure, provided with an indoor pressure detecting means for detecting the pressure in the room and a small room pressure detecting means for detecting the pressure of each of the plurality of small rooms. The heat exchange ventilation air conditioning unit indoors such that the indoor pressure is always higher than the respective pressures of the plurality of small chambers regardless of whether the exhaust blower is operated by the calculating means. The heat exchange ventilation air conditioner according to claim 1, further comprising control means for increasing the air flow rate of the blower for air. 4. A human body detecting means for detecting the presence / absence of a person in each room, and a calculating means for calculating the number of persons in the room by the human body detecting means and further calculating a circulating air volume, the heat exchanging by the calculating means. The heat exchange ventilation air conditioner according to claim 1, further comprising control means for changing the air flow rate of the indoor blower of the ventilation air conditioning unit and the air flow rate of the outdoor exhaust blower. 5. A human body detecting means for detecting the presence or absence of a person in each room, and the number of persons present in each room in the room are calculated by this human body detecting means, and the total circulating air volume and air supply to each room are calculated. A control means for changing the air flow rate of the indoor blower of the heat exchange ventilation air conditioning unit and the air flow rate of the outdoor exhaust blower of the heat exchange ventilation air conditioning unit, and a damper are provided in each indoor air supply duct. The heat exchange ventilation air conditioner according to claim 1, further comprising a control unit for controlling the damper for changing the supply air volume. 6. An odor detecting means for detecting odor in one of the plurality of small rooms, and a humidity detecting means for detecting humidity in two of the other small rooms. When a odor above a certain level is detected by the above, or when a humidity above a certain level is detected by the humidity detecting means, the plurality of exhaust blowers provided in the small room are operated in conjunction with each other, and the heat exchange ventilation air conditioning unit is used for indoor use. The heat exchange ventilation air conditioner according to claim 1, further comprising control means for increasing the air volume of the blower.