JP6781560B2 - Ventilator - Google Patents

Description

The present invention includes a supply air blower and an exhaust blower, and can connect a duct that supplies air indoors from a location where the outside air temperature can be raised, and heat exchange using a refrigerant that can utilize the temperature difference between the room temperature and the outside air temperature. It relates to a ventilation system having a vessel inside.

As a conventional example, the one described in Patent Document 1 is known, in which outdoor air heated by sunlight is taken indoors and used for indoor heating, or outdoor air heated by sunlight is heat exchanged. It was used to heat water with a coil and was called a handling unit.

Japanese Unexamined Patent Publication No. 2014-238227

In the handling unit in Patent Document 1, when the outdoor air heated by sunlight is used for indoor heating, the heated indoor is premised on a highly airtight house, and the sent outdoor air is discharged. It was necessary to provide a separate exhaust port for this purpose, but there was a problem that the outdoor air discharged from the exhaust port and the indoor air having a temperature difference could not be used.

Regarding the handling unit in Patent Document 1, the outdoor air heated by sunlight is only used for indoor heating and heating of hot water. Therefore, if it is not possible to heat with sunlight at night or due to bad weather, it is not possible to heat it, and it was not possible to cope with cooling in the summer, so if you try to correspond to this, it is a separate heating and cooling facility. It was necessary to provide. In order to install a separate air conditioner, an installation location is required separately from the handling unit, and in order to manage the indoor temperature, it is necessary to integrate and manage the handling unit and another air conditioner. Performing the two managements in parallel has a problem of complexity.

Further, when the handling unit in Patent Document 1 is attached to a roof or ceiling, the presence of a heat exchange coil in which water circulates may cause water leakage due to poor construction or deterioration over time, and indoors. There was a problem that there was a risk of water leakage. Further, regarding heat exchange between air and water, there is a problem that heat exchange is difficult to be performed unless the temperature difference between air and water is large, and heat recovery is inefficient when the temperature difference is small.

Further, in the house to which the handling unit in Patent Document 1 is attached, a flow path (means for heating outdoor air) for heating outdoor air with sunlight is provided on the roof, but only for heating outdoor air. , There was a problem that it was not available.

In order to solve the above problems, the following technical measures are taken in the present invention.

The ventilation device of the first invention includes an air supply blower that supplies outside air indoors, an air supply side refrigerant heat exchanger that exchanges heat between the outside air and a refrigerant, and an exhaust blower that exhausts indoor air from the indoors. An exhaust side refrigerant heat exchanger for heat exchange between indoor air and refrigerant is provided, and the refrigerant passes only through the exhaust side refrigerant heat exchanger, or both the air supply side refrigerant heat exchanger and the exhaust side refrigerant heat exchanger. A refrigeration cycle is formed by a water heating heat exchanger, a compressor, and an expansion valve that exchange heat between the refrigerant and water.

The ventilation device of the second invention includes an air supply blower that supplies outside air indoors, an air supply side refrigerant heat exchanger that exchanges heat between the outside air and a refrigerant, and an exhaust blower that exhausts indoor air from the room. An exhaust side refrigerant heat exchanger for heat exchange between indoor air and refrigerant is provided, and the refrigerant passes only through the exhaust side refrigerant heat exchanger, or both the air supply side refrigerant heat exchanger and the exhaust side refrigerant heat exchanger. A refrigeration cycle is formed by a water heating heat exchanger, an outdoor refrigerant heat exchanger, a compressor, a four-way valve, and an expansion valve that exchange heat between the refrigerant and water.

In the invention according to claim 1 or 2 , the ventilation device of the third invention is provided with a plurality of outside air ports and return air ports to which ducts are attached on the upstream side of the air supply blower, and the plurality of outside air ports are provided. An on-off valve is provided at the return port.

In the invention according to claim 1 to 3 , the ventilation device of the fourth invention is provided with a plurality of exhaust ports to which an exhaust duct is attached on the downstream side of the exhaust blower, and an on-off valve is provided at the plurality of exhaust ports. Is provided.

In the invention according to claim 1 to 4 , the ventilation device of the fifth invention is provided with one or more air supply ports to which an air supply duct is attached on the downstream side of the air supply blower, and the one or more air supply ports are provided. An on-off valve is provided at the mouth.

The ventilation device of the sixth invention is one in the case where the plurality of outside air ports and return air ports, the plurality of exhaust ports, and the one or more air supply ports are provided in the invention according to claim 5. It is provided on the outer surface of the housing.

Having the above technical means has the following effects.

According to the first invention , the ventilation device includes an air supply blower that supplies outside air indoors, an air supply side refrigerant heat exchanger that exchanges heat between the outside air and the refrigerant, and an exhaust blower that exhausts indoor air from the indoors. An exhaust-side refrigerant heat exchanger that exchanges heat between the indoor air and the refrigerant is provided, and the refrigerant passes only through the exhaust-side refrigerant heat exchanger, or the air supply-side refrigerant heat exchanger and the exhaust-side refrigerant heat exchange. Refrigerant passes through both vessels,
Since a refrigeration cycle is formed by a water heating heat exchanger, a compressor, and an expansion valve that exchange heat between the refrigerant and water, the air supply side refrigerant heat exchanger recovers the heat energy of the outside air at the time of air supply. At the same time, the waste heat of the indoor air can be recovered by the exhaust side refrigerant heat exchanger at the time of exhaust, and the efficiency of the refrigeration cycle can be increased. In addition, since hot water is not used and the refrigerant is used, there is no concern about water leakage and installation work is easy.

According to the second invention , the ventilation device includes an air supply blower that supplies outside air indoors, an air supply side refrigerant heat exchanger that exchanges heat between the outside air and the refrigerant, and an exhaust blower that exhausts indoor air from the indoors. An exhaust-side refrigerant heat exchanger that exchanges heat between the indoor air and the refrigerant is provided, and the refrigerant passes only through the exhaust-side refrigerant heat exchanger, or the air supply-side refrigerant heat exchanger and the exhaust-side refrigerant heat exchange. Refrigerant passes through both vessels,
Since the refrigeration cycle is formed by the water heating heat exchanger that exchanges heat between the refrigerant and water, the outdoor refrigerant heat exchanger, the compressor, the four-way valve, and the expansion valve, the air supply side refrigerant heat exchange occurs during air supply. The outside air is cooled or heated by the device, and at the time of exhaust, the temperature of the refrigerant is lowered by the indoor air cooled by the exhaust side refrigerant heat exchanger, or the waste heat is recovered to increase the efficiency of the refrigeration cycle. Can be done. In addition, since hot water is not used and the refrigerant is used, there is no concern about water leakage and installation work is easy.

According to the third invention , utilizing the first invention or the second invention , the ventilation device is provided with a plurality of outside air ports and return air ports to which ducts are attached on the upstream side of the air supply blower, and the plurality of ventilation ports are provided. Since the outside air port and the return air port are provided with on-off valves, it is possible to provide an air passage for warming the outside air with sunlight on the roof, and it is possible to select the outside air that passes through it and the outside air that does not pass through, so it is warmed up. It is possible to select heating that also serves as ventilation with the outside air that has been warmed up, or ventilation with the outside air that has not been warmed up.

Further, since the return air port is provided, it is possible to mix indoor air with the above-mentioned warmed outside air and unheated outside air, so that the temperature of the air sucked into the air supply blower can be adjusted. Ventilation is possible. Further, when the air supply side refrigerant heat exchanger is used, the passing temperature can be adjusted according to the state of the refrigerant.

According to the fourth invention , utilizing the first to third inventions , the ventilation device is provided with a plurality of exhaust ports to which an exhaust duct is attached on the downstream side of the exhaust blower, and the plurality of exhaust ports are provided with a plurality of exhaust ports. Since the on-off valve is provided, it is possible to select the place to exhaust when the outside temperature and solar radiation conditions are different in winter and summer, and in summer, if the cold indoor air can be discharged to the roof side, the roof It is possible to suppress the heat transferred from the roof and increase the cooling efficiency indoors. In addition, when a photovoltaic power generation panel is installed, the power generation efficiency can be increased.

According to the fifth invention, according to the first to fourth inventions , one or more air supply ports to which an air supply duct is attached are provided on the downstream side of the air supply blower, and the one or more air supply ports are provided. Since the on-off valve is provided, for example, if the place to supply air is narrow, one can sufficiently cool and heat. Further, even if the place to supply air is wide, the place to send air can be selected according to the blowing temperature of the air supply blower. For example, in the case of air colder than room temperature, the ceiling portion is warmed above room temperature. The air is under the floor. Furthermore, it is possible to send them individually to a plurality of rooms.

According to the sixth invention , when the fifth invention is used and the ventilation device is provided with the plurality of outside air ports and return air ports, the plurality of exhaust ports, and the one or more air supply ports , any of the ventilation devices is provided. Is provided on the outer surface of one housing, which facilitates selection of the installation location of the ventilation fan itself, installation work, and repair work. Also, if the place where the outside air is taken in and the place where the outside air is exhausted are the same, one duct can be branched and connected to the outside air port and the exhaust port, so the installation space of the duct can be small. Duct construction becomes easier.

It is a perspective view which shows the appearance of the ventilation apparatus which concerns on Example 1 of this invention. It is a perspective view explaining the inside of the ventilation apparatus which concerns on Example 1 of this invention. It is a schematic diagram which installs the ventilation apparatus which concerns on Example 1 of this invention indoors, and explains the relationship with a refrigeration cycle. It is explanatory drawing explaining the 1st refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is explanatory drawing explaining another example of the 1st refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is explanatory drawing explaining the 2nd refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is explanatory drawing explaining the 3rd refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is explanatory drawing explaining the 4th refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is explanatory drawing explaining the 5th refrigeration cycle of the ventilation apparatus which concerns on Example 1 of this invention. It is a perspective view which shows the appearance of the ventilation apparatus which concerns on Example 2 of this invention. It is a perspective view explaining the inside of the ventilation apparatus which concerns on Example 2 of this invention. It is explanatory drawing explaining the 6th refrigeration cycle of the ventilation apparatus which concerns on Example 2 of this invention.

The embodiment of the invention will be specifically described with reference to the drawings.

The appearance of the ventilation device 1 of the present invention will be described with reference to FIG. The ventilator 1 has an appearance provided with a substantially rectangular parallelepiped housing, and can be roughly divided into a configuration in which a heat exchanger chamber 11, a filter chamber 12, an air supply blower chamber 13 and an exhaust blower chamber 14 are combined. There is.

The heat exchanger chamber 11, the filter chamber 12, the air supply blower chamber 13 and the exhaust blower chamber 14 are substantially square at the points where they are connected to each other, and the heat exchanger chamber 11, the filter chamber 12, the air supply blower chamber 13, The points where the exhaust blower chambers 14 are connected to each other are substantially square, and can be rotated by 90 degrees for installation.

A first outside air port 21 and a second outside air port 22 are provided on the upper surface of the heat exchanger chamber 11. Further, a first return air port 28 and a second return air port 31 are provided on the front side surface of the heat exchanger chamber 11. Further, a first air supply port 26 and a second air supply port 27 are provided on the upper surface of the air supply blower room 13, and a first exhaust port 36 and a second exhaust port 37 are provided on the upper surface side of the exhaust blower room 14. Has been done.

Ventilation devices 1 are provided in the first outside air port 21, the second outside air port 22, the first return air port 28, the first air supply port 26, the second air supply port 27, the first exhaust port 36 and the second exhaust port 37. A damper 41 driven by a motor or a servomotor having a mechanism capable of detecting the position of the opening degree of a valve mounted inside the cylinder portion is provided so that the cylinder portion protrudes from the outer surface of the cylinder portion by a predetermined length. ing.
Further, the first outside air port 21, the second outside air port 22, the first return air port 28, the first air supply port 26, the second air supply port 27, the first exhaust port 36, the second exhaust port 37, and the second return port. A round duct can be attached to the tip of the air opening 31. In this embodiment, the cross-sectional shape of the duct is round, but the cross-sectional shape of the duct may be square or elliptical.

The arrangement of parts inside the ventilation device 1 will be described with reference to FIG. FIG. 2 shows the first outside air port 21, the second outside air port 22, the first return air port 28, the first air supply port 26, the second air supply port 27, the first exhaust port 36, and the second exhaust port 37 from FIG. It is the figure which showed the state which removed the 2nd return air opening 31 and removed the exterior other than the bottom plate of the ventilation system 1. The shape of the removed portion is represented by a broken line.

An air supply side refrigerant heat exchanger 23 and an exhaust side refrigerant heat exchanger 32 are attached to a portion of the heat exchanger chamber 11, and between the air supply side refrigerant heat exchanger 23 and the exhaust side refrigerant heat exchanger 32. Is provided with a heat exchanger chamber partition plate 16 that divides the heat exchanger chamber 11. A filter 24 is attached to a portion of the filter chamber 12. Further, an air supply blower 25 is attached to the air supply blower room 13, and an exhaust blower 35 is attached to the exhaust blower room 14.

The air supply side refrigerant heat exchanger 23 is either outdoor air taken in from the first outside air port 21 and the second outside air port 22 or indoor air taken in from the first return air port 28 in the heat exchanger chamber 11. Alternatively, the heat exchanger chamber 11 is provided diagonally across the cross section so as to block the cross section through which both pass. In FIG. 2, the air and refrigerant in the air supply side refrigerant heat exchanger 23 are provided at an angle rather than at right angles to the cross-sectional direction of the heat exchanger chamber 11. This is because the size of the heat exchanger chamber 11 and the ventilation device 1 itself can be reduced without narrowing the area where heat can be exchanged with.

The air supply side refrigerant heat exchanger 23 is composed of a metal tube such as copper having good thermal conductivity through which the refrigerant circulates, and metal fins such as aluminum for expanding the heat conduction area of the metal tube. When heating the air passing through the air supply side refrigerant heat exchanger 23, the refrigeration cycle is configured so that the air supply side refrigerant heat exchanger 23 acts as a condenser, and the outer surfaces of the metal pipe and the metal fin are covered. Heat is transferred from the high-temperature and high-pressure gaseous refrigerant to either or both of the flowing outdoor air and indoor air, and the refrigerant is liquefied. The heat of condensation at this time causes the air to pass through the air supply-side refrigerant heat exchanger 23. To heat. When cooling the air passing through the air supply side refrigerant heat exchanger 23, the refrigeration cycle is configured so that the air supply side refrigerant heat exchanger 23 acts as an evaporator, and when the low temperature and low pressure refrigerant evaporates. The heat of evaporation removes heat from either or both of the outdoor air and the indoor air passing through the air supply side refrigerant heat exchanger 23.

The exhaust side refrigerant heat exchanger 32 is provided diagonally across the cross section of the heat exchanger chamber 11 so as to block the cross section through which the indoor air taken in from the second return air port 31 passes into the heat exchanger chamber 11. There is. In FIG. 2, the exhaust side refrigerant heat exchanger 32 is not provided at right angles to the cross-sectional direction of the heat exchanger chamber 11 but at an angle, as in the air supply side refrigerant heat exchanger 23. This is because the size of the ventilation device 1 itself can be reduced without impairing the performance as a vessel.

The exhaust-side refrigerant heat exchanger 32 is composed of a metal tube such as copper having good thermal conductivity through which the refrigerant circulates, and metal fins such as aluminum for expanding the heat conduction area of the metal tube. When the exhaust side refrigerant heat exchanger 32 recovers the exhaust heat of the indoor air that is warmer than the outdoor air, the refrigerating cycle is configured so that the exhaust side refrigerant heat exchanger 32 becomes an evaporator and warmed. By evaporating the refrigerant with the indoor air, the efficiency of the refrigeration cycle is increased and the heating capacity on the condenser side is improved.

When the exhaust side refrigerant heat exchanger 32 utilizes the temperature difference of the indoor air that is cooled more than the outdoor air, the refrigerating cycle is configured so that the exhaust side refrigerant heat exchanger 32 becomes a condenser to cool the air. By condensing the refrigerant with the indoor air, the efficiency of the refrigeration cycle is increased and the cooling capacity of the evaporator is improved.

The filter 24 is attached so as to cross the cross section of the filter chamber 12, and is an air filter material processed into a thin plate such as natural fiber or synthetic fiber that can remove dust from the outside air and indoor air passing through the filter chamber 12. Is. The structure is such that the filter 24 can be attached and detached by inserting the filter 24 from the outer side surface of the ventilation device 1 so that the filter 24 can be attached and detached from the outer surface of the filter chamber 12. This is to facilitate cleaning and replacement of the filter 24.

The air supply blower 25 is extended to a predetermined length in the pressure loss caused by the air supply side refrigerant heat exchanger 23 and the filter 24, and in the first outside air port 21, the second outside air port 22, and the first air supply port 26. A blower that can obtain a sufficient air volume is selected assuming that a duct will be installed. Similarly, with respect to the exhaust blower 35, it is assumed that the pressure loss due to the exhaust side refrigerant heat exchanger 32 and the ducts extended to a predetermined length are attached to the first exhaust port 36 and the second exhaust port 37. A blower that can obtain a sufficient air volume has been selected.

In this embodiment, the air supply blower 25 and the exhaust blower 35 are carried out by a sirocco fan, but other types of blowers may be used as long as the above-mentioned blowing capacity can be obtained.

Air supply blower 25, exhaust blower 35, first outside air port 21, second outside air port 22, first return air port 28, first air supply port 26, second air supply port 27, first exhaust port 36 and second The drive unit for the damper 41 provided in each of the exhaust ports 37 is driven by the supply of electricity, and the operating condition set by the remote control device (not shown) installed at an appropriate place indoors. It is controlled by a control board (not shown) so as to match. As will be described later, an expansion valve 67 and a solenoid valve 76 are provided in the vicinity of the air supply side refrigerant heat exchanger 23 and the exhaust side refrigerant heat exchanger 32, and similarly, a control board (not shown). Is controlled by.

An example of using the ventilation device 1 in combination with a refrigeration cycle will be described with reference to the schematic diagram of FIG. The ventilation device 1 is installed in the vicinity of the ceiling 7 of the indoor 6 surrounded by the roof 91, the foundation 92 and the wall 93. Considering that the living space of the indoor 6 can be effectively used and the installation work of the duct, if there is no problem with these, the other space of the indoor 6 or the outdoor or the roof 91 may be used.

In the ventilation device 1, a portion through which air flows by driving the air supply blower 25 (hereinafter, abbreviated as an air supply unit of the ventilation device 1) will be described. A first outside air duct 51 is attached to the first outside air port 21 (OA1), and the first outside air duct 51 is connected to a roof air passage 9 installed on the roof 91. The roof 91 may be a solar cell, a pneumatic heat collector, or the like, and the roof air passage 9 may be an air passage that passes under the solar cell or an air passage inside the pneumatic heat collector. The roof air passage 9 is provided on the south side of the roof 91 to receive sunlight, and has a predetermined length so that the heat from the outer surface can be easily transferred to the outside air by heating the outer surface by sunlight. It is a wind path. When the outside air is sucked into the ventilation device 1 from the roof air passage 9, the outside air is taken into the ventilation device 1 in a warmed state when there is sunlight.

A second outside air duct 52 is attached to the second outside air port 22 (OA2), and the second outside air duct 52 takes in outside air that is not easily affected by sunlight into the ventilation device 1 in the vicinity of the wall 93 on the north side. be able to. The first return air port 28 (RA1) can take indoor air in the vicinity of the ventilation device 1 into the ventilation device 1 for air supply.

An air supply duct 53 is attached to the first air supply port 26 (SA1), and the end of the air supply duct 53 is open inside the underfloor 8. As a result, the outside air and indoor air taken in by the ventilation device 1 can be sent to the underfloor 8. The end of the air supply duct 53 may be opened not only under the floor 8 but also in the vicinity thereof. Regarding the second air supply port 27 (SA2), the outside air and indoor air taken in by the ventilation device 1 can be sent out to the vicinity of the ventilation device 1. Further, even when there is no flow path leading to the underfloor and the place where the air supply is sent is narrow, the second air supply port 27 or the first air supply port 26 alone can sufficiently cool and heat.

In the ventilation device 1, a portion through which air flows by driving the exhaust blower 35 (hereinafter, abbreviated as the exhaust portion of the ventilation device 1) will be described. The second return port 31 (RA2) can take indoor air in the vicinity of the ventilation device 1 into the ventilation device 1 for exhaust. A first exhaust duct 56 is attached to the first exhaust port 36 (EA1), and the end of the first exhaust duct 56 is open to the outside.

A second exhaust duct 57 is attached to the second exhaust port 37 (EA2), and the second exhaust duct 57 is connected to the roof air passage 9 installed on the roof 91. As a result, indoor air can be exhausted to the roof air passage 9, and when the roof air passage 9 has a high temperature, the temperature of the roof 91 connected to the roof air passage 9 can be lowered.

The first outside air duct 51 and the second exhaust duct 57 are installed so as to merge in the middle because the installation work is easy. The damper 41 is not provided only for the second return port 31. This is because the flow path can be selected by opening and closing with the damper 41 of the first exhaust port 36 and the second exhaust port 37, and it is not necessary to close the second return air port 31 in this embodiment.

Refrigerant pipes are connected to the air supply side refrigerant heat exchanger 23 and the exhaust side refrigerant heat exchanger 32 provided inside the ventilation device 1, and a refrigeration cycle is formed. The refrigeration cycle is a substance that carries heat energy to the inside, and is formed by circulating a refrigerant that can take advantage of the property of taking away heat from the surroundings when the liquid vaporizes, and is a typical refrigerant. Examples include propane, methane, chlorofluorocarbons, carbon dioxide and ammonia.

The following members are provided outside the ventilation device 1 and usually outdoors to form this refrigeration cycle. Heat exchanger 61 for water heating, compressor 62, outdoor refrigerant heat exchanger 63, four-way valves 65 and 66, expansion valves 67 to 69, solenoid valves 71 to 76 and check valves 78, each of which is connected by a refrigerant pipe. Has been done.

The water heating heat exchanger 61 has two flow paths inside, and the heat energy of the refrigerant circulating in one flow path is circulated by the circulation pump 81 in the other flow path. It is moved to a heat medium (for example, a liquid obtained by adding an antifreeze agent to an antifreeze liquid such as propylene glycol) to heat the water stored inside the hot water storage tank 82. In the embodiment, the heat exchanger 83 is provided inside the hot water storage tank 82 to indirectly heat the water inside the hot water storage tank 82, but the water inside the hot water storage tank 81 is not provided without the heat exchanger 83. Water may be heated directly.

Further, the hot water heated in the hot water storage tank 82 requires hot water such as a bathtub 87 from the hot water supply pipe 85 connected to the upper part of the hot water storage tank 82 by the water pressure applied to the water supply pipe 84 connected to the lower part of the hot water storage tank 82. It is sent to the hot water tap 86 of the place and used.

The compressor 62 is electrically driven to compress the refrigerant that has become a gas by a method such as a rotary type (rotary type) or a reciprocating type (reciprocating type), and makes it a high-temperature and high-pressure gas to facilitate liquefaction of the refrigerant. There is. It should be noted that the compressor 62 preferably supports so-called inverter control that can change the capacity, so that fine capacity control becomes possible.

The outdoor refrigerant heat exchanger 63 is composed of a metal tube such as copper having good thermal conductivity through which the refrigerant circulates, and metal fins such as aluminum for expanding the heat conduction area of the metal tube. A blower 64 is attached to the outdoor refrigerant heat exchanger 63 in the vicinity, and when the air supply side refrigerant heat exchanger 23, the exhaust side refrigerant heat exchanger 32 and the water heating heat exchanger 61 perform condensation or evaporation. It is provided as an aid to eliminate the insufficient condensation and insufficient evaporation of. When it is necessary to circulate the refrigerant in the outdoor refrigerant heat exchanger 63, the blower 64 is electrically driven to circulate the outside air in the outdoor refrigerant heat exchanger 63 to operate as a condenser or an evaporator. ing.

The four-way valves 65 and 66 are devices for switching the flow path of the refrigeration cycle, and have four connection ports. By electrically driving, the combination of the four connection ports that communicate internally is changed, and the two flow paths are switched.

The expansion valves 67 to 69 reduce the pressure of the liquefied refrigerant in the middle of the refrigerant piping to facilitate vaporization, and the flow rate of the passing refrigerant can be adjusted by electrically driving the expansion valves 67 to 69. By adjusting the flow rate of the refrigerant, the passage of the refrigerant can be blocked.

The solenoid valves 71 to 76 are valves that can shut off the flow path in the middle of the refrigerant pipe, and are used for switching the flow path of the refrigeration cycle.

The check valve 78 is a valve for preventing the backflow of the refrigerant in the middle of the refrigerant piping. The check valve 78 operates mechanically rather than being controlled from the outside.

The schematic diagram of the refrigeration cycle of FIG. 3 is an example of a refrigeration cycle capable of supporting a plurality of seasonal changes and required functions, and if one function is to be supported, one of the expansion valves 67 to 69 is used. Alternatively, the four-way valves 65 and 66, the electromagnetic 71-76, and the check valve 78 can be omitted.

Further, the expansion valve 67, the solenoid valve 71 and the check valve 78 may be provided outside the ventilation device 1, but in this embodiment, they are provided inside the housing of the ventilation device 1. This is because it can be protected from the outside and the installation work becomes easier.

In the schematic view of FIG. 3, the first refrigeration cycle in which the compressor 62, the four-way valves 65 and 66, the expansion valves 67 to 69 and the solenoid valves 71 to 76 are driven to form one refrigeration cycle will be described with reference to FIG. To do.

The configuration of the first refrigeration cycle of FIG. 4 is that the exhaust side refrigerant heat exchanger 32 recovers the heat energy from the indoor air and stores the water in the hot water storage tank 82 via the water heating heat exchanger 61. This is the case for heating. A assumed state is a case where water is heated in the daytime heating and the hot water storage tank 82 in winter.

In the air supply section of the ventilation device 1, the air supply blower 25 is driven, only the damper 41 of the first outside air port 21 and the first air supply port 26 is opened, and in the exhaust section, the exhaust blower 35 is driven. Only the damper 41 of one exhaust port 36 is open. As a result, the outside air warmed by the roof air passage 9 is sent to the underfloor 8 and the air in the indoor 6 is convected to heat the entire indoor 6 and heat energy is higher than the outside air from the first exhaust duct 56. The air of the indoor 6 having the above is discharged.

Since the warmed outside air is sent into the indoor 6 from the first air supply port 26, the indoor air is normally discharged from the gap in the indoor 6 without driving the exhaust blower 35. However, the amount of air supply cannot be increased unless the static pressure of the air supply blower 25 is increased. However, in the exhaust section, the damper 41 of the first exhaust port 36 is opened and the exhaust blower 35 is also driven. It is not necessary to increase the capacity of the air blower 25 and the exhaust blower 35 such as static pressure and air volume.

Next, the state in which the first refrigeration cycle of FIG. 4 is driven will be described. Solenoid valves 73, 74, 75 and expansion valve 67 shut off the flow path of the refrigerant pipe. When the compressor 62 is driven, the flow path switched by the four-way valves 65 and 66 allows the high-temperature (for example, 70 degrees Celsius) and high-pressure gas refrigerant to be used in the water heating heat exchanger 61 from the discharge side of the compressor 62. Flow to. The water heat exchanger 61 exchanges heat with water to lower the temperature (for example, 35 degrees Celsius), which becomes a liquid refrigerant, and the refrigerant decompressed by the expansion valve 68 is evaporated by the exhaust side refrigerant heat exchanger 32. It becomes a gaseous refrigerant whose temperature has been further lowered (for example, 15 degrees Celsius), and returns to the suction side of the compressor 62 by the flow path switched by the four-way valve 65.

In the exhaust side refrigerant heat exchanger 32, the temperature of the refrigerant that has become a gas is raised from the warmed air (for example, 20 degrees Celsius) in the indoor 6 so that the high temperature and high pressure gas in the compressor 62 can be generated with a small amount of electric power. It can be compressed into a refrigerant, which improves efficiency in the refrigeration cycle, resulting in recovery of exhaust heat from the warmed air in the indoor 6.

If the damper 41 of the first air supply port 26 is closed and the damper 41 of the second air supply port 27 is opened by using the first refrigeration cycle as shown in FIG. 5, it is indoors. Since the outside air warmed by the roof air passage 9 is sent to the upper part of 6, the indoor 6 is not heated, and the outside air warmed by the roof air passage 9 almost lowers the temperature from the second return port 31. Since it is sent to the exhaust side refrigerant heat exchanger 32 without any heat, the heat energy from the outside air warmed by the roof air passage 9 is directly recovered and stored in the hot water storage tank 82 via the water heating heat exchanger 61. Can also be heated.

In the schematic view of FIG. 3, a second refrigeration cycle in which the compressor 62, the four-way valves 65 and 66, the expansion valves 67 to 69 and the solenoid valves 71 to 76 are driven to form one refrigeration cycle will be described with reference to FIG. To do.

In the second refrigeration cycle configuration of FIG. 6, the air supply side refrigerant heat exchanger 23 recovers the heat energy from the outside air, and the exhaust side refrigerant heat exchanger 32 recovers the heat energy from the indoor air to obtain water. This is a case where the water stored in the hot water storage tank 82 is heated via the heat exchanger 61 for heating. A assumed state is a case where the water is heated in the hot water storage tank 82 in the daytime in the intermediate period when the ventilation device 1 does not perform heating and cooling.

In the air supply section of the ventilation device 1, the air supply blower 25 is driven, only the dampers 41 of the first outside air port 21 and the second air supply port 27 are opened, and in the exhaust section, the exhaust blower 35 is driven. Only the damper 41 of one exhaust port 36 is open. As a result, the outside air warmed by the roof air passage 9 is sent to the second return air port 31 only in the vicinity of the ceiling 7 without heating the indoor 6, and is sent from the first exhaust duct 56 to the outside air more than the outside air. Warm air with thermal energy is being exhausted.

Next, the state in which the second refrigeration cycle of FIG. 6 is driven will be described. Solenoid valves 71, 73, 74, and 75 block the flow path of the refrigerant pipe. When the compressor 62 is driven, the flow path switched by the four-way valves 65 and 66 allows the high-temperature (for example, 70 degrees Celsius) and high-pressure gas refrigerant to be used in the water heating heat exchanger 61 from the discharge side of the compressor 62. Flow to. The water heat exchanger 61 exchanges heat with water to lower the temperature (for example, 35 degrees Celsius), which becomes a liquid refrigerant, and the refrigerant decompressed by the expansion valve 68 is used as the exhaust side refrigerant heat exchanger 32 and the air supply side refrigerant. It is evaporated by the heat exchanger 23 to become a refrigerant of a gas whose temperature is further lowered (for example, 15 degrees Celsius), and returns to the suction side of the compressor 62 by the flow path switched by the four-way valve 65.

In the exhaust side refrigerant heat exchanger 32, the temperature of the gasified refrigerant is raised by warmed air near the ceiling 7 (for example, 20 degrees Celsius), and in the air supply side refrigerant heat exchanger 23, the roof. Since the temperature of the gaseous refrigerant is raised by the outside air warmed by the air passage 9 (for example, 30 degrees Celsius), it is possible to compress the refrigerant into a high-temperature, high-pressure gaseous refrigerant by the compressor 62 with a small amount of power. As a result, the efficiency in the refrigeration cycle is improved, and as a result, the exhaust heat from the warmed air in the indoor 6 is recovered.

In the schematic view of FIG. 3, FIG. 7 shows a third refrigeration cycle in which the compressor 62, the blower 64, the four-way valves 65 and 66, the expansion valves 67 to 69 and the solenoid valves 71 to 76 are driven into one refrigeration cycle. It will be described using.

The third refrigeration cycle configuration of FIG. 7 is a case where the exhaust side refrigerant heat exchanger 32 uses the cooled indoor air and the air supply side refrigerant heat exchanger 23 cools the air. The assumed state is the case where the ventilation device 1 is used for cooling in the summer.

In the air supply part of the ventilation device 1, the air supply blower 25 is driven to open only the damper 41 of the second outside air port 22, the second air supply port 27 and the first return air port 28, and the exhaust part exhausts. The blower 35 is driven, and only the damper 41 of the second exhaust port 37 is opened. The indoor 6 is cooled by the indoor air from the first return port 28 and the outside air from the outside, and the ventilation device 1 installed near the ceiling 7 is cooled by the air supply side refrigerant heat exchanger 23. Since air lower than the temperature of the air is blown out, the air cooled inside the indoor 6 is convected to cool the entire indoor 6. It is explained that the damper 41 of the first return port 28 of the air supply unit is opened, but when it is necessary to increase the ventilation volume or when the indoor temperature is higher than the outside air temperature. In the case of, the damper 41 of the first return air port 28 may be closed, or the opening degree may be adjusted in the closing direction.

In the summer, not only during the daytime, the roof 91 has heat accumulated by the sunlight, which hinders the cooling in the indoor 6. Therefore, with respect to the air discharged from the indoor 6, the damper 41 of the second exhaust port 37 is opened with the first exhaust port 36 closed, and the air is flowed from the second exhaust duct 57 to the roof air passage 9. It is possible to cool the roof 91 and improve the cooling effect of the indoor 6.

Next, the state in which the third refrigeration cycle of FIG. 7 is driven will be described. Solenoid valves 71, 74, 75 and expansion valve 68 block the flow path of the refrigerant pipe. When the compressor 62 is driven, a high-temperature (for example, 70 degrees Celsius) / high-pressure gas refrigerant is sent to the outdoor refrigerant heat exchanger 63 from the discharge side of the compressor 62 by the flow path switched by the four-way valves 65 and 66. It flows. The outdoor refrigerant heat exchanger 63 exchanges heat with the outside air by the blower 64 to lower the temperature of the refrigerant, and the exhaust side refrigerant heat exchanger 32 further lowers the temperature (for example, 35 degrees Celsius) to become a liquid refrigerant that expands. The refrigerant decompressed by the valve 67 is evaporated by the air supply side refrigerant heat exchanger 23 to become a gas, so that the air supply side refrigerant heat exchanger 23 is cooled. After that, it returns to the suction side of the compressor 62 by the flow path switched by the four-way valve 65.

In the exhaust side refrigerant heat exchanger 32, since the temperature of the liquid refrigerant can be lowered by the cooled air (for example, 27 degrees Celsius) of the indoor 6, the compressor 62 can be operated with a small amount of energy. As a result, the efficiency of the refrigeration cycle is improved, and as a result, the energy using the cooled air in the indoor 6 can be reduced.

In the schematic view of FIG. 3, FIG. 8 shows a fourth refrigeration cycle in which the compressor 62, the blower 64, the four-way valves 65 and 66, the expansion valves 67 to 69 and the solenoid valves 71 to 76 are driven into one refrigeration cycle. It will be described using.

In the fourth refrigeration cycle configuration of FIG. 8, indoor air cooled by the exhaust side refrigerant heat exchanger 32 is used and cooled by the air supply side refrigerant heat exchanger 23, and at the same time, the water heating heat exchanger 61 is used. This is a case where the water stored in the hot water storage tank 82 is heated through the hot water storage tank 82. The assumed state is a case where the water in the hot water storage tank 82 is heated at the same time as the cooling is performed by the ventilation device 1 in the summer.

In the case of the fourth refrigeration cycle, even if the refrigerant circulates in the water heating heat exchanger 61, if the circulation pump 81 is not circulated, water is discharged from the refrigerant in the water heating heat exchanger 61. There is no heat exchange to, in this case only cooling.

In the air supply section of the ventilation device 1, the air supply blower 25 is driven to open the second outside air port 22, the second air supply port 27 and the damper 41 of the first return air port 28, and in the exhaust section, the exhaust blower 35 is driven, and only the damper 41 of the second exhaust port 37 is opened. The indoor air 6 is cooled by the indoor air from the first return port 28 and the outside air from the outside, and the air lower than the temperature of the indoor air is blown out from the ventilation device 1 installed near the ceiling 7. Air is convected in the indoor 6 to cool the entire indoor 6. It is explained that the damper 41 of the first return port 28 of the air supply unit is opened, but when it is necessary to increase the ventilation volume or when the indoor temperature is higher than the outside air temperature. In the case of, the damper 41 of the first return air port 28 may be closed, or the opening degree may be adjusted in the closing direction.

In the summer, not only during the daytime, the roof 91 has heat accumulated by the sunlight, which hinders the cooling in the indoor 6. Therefore, with respect to the air discharged from the indoor 6, the damper 41 of the second exhaust port 37 is opened with the first exhaust port 36 closed, and the air is flowed from the second exhaust duct 57 to the roof air passage 9. It is possible to cool the roof 91 and improve the cooling effect of the indoor 6.

Next, the state in which the fourth refrigeration cycle of FIG. 8 is driven will be described. The solenoid valves 71, 73, 75 and the expansion valve 68 block the flow path of the refrigerant pipe. When the compressor 62 is driven, the flow path switched by the four-way valves 65 and 66 allows the high-temperature (for example, 70 degrees Celsius) and high-pressure gas refrigerant to be used in the water heating heat exchanger 61 from the discharge side of the compressor 62. Flow to. The water heating heat exchanger 61 exchanges heat with water to lower the temperature (for example, 45 degrees Celsius), which becomes a liquid refrigerant and flows to the outdoor refrigerant heat exchanger 63.

The outdoor refrigerant heat exchanger 63 exchanges heat with the outside air by the blower 64 to lower the temperature of the refrigerant, and the exhaust side refrigerant heat exchanger 32 further lowers the temperature (for example, 35 degrees Celsius) to become a liquid refrigerant that expands. The refrigerant decompressed by the valve 67 is evaporated by the air supply side refrigerant heat exchanger 23 to become a gas, so that the air supply side refrigerant heat exchanger 23 is cooled. After that, it returns to the suction side of the compressor 62 by the flow path switched by the four-way valve 65.

In the exhaust side refrigerant heat exchanger 32, since the temperature of the liquid refrigerant can be lowered by the cooled air (for example, 27 degrees Celsius) of the indoor 6, the compressor 62 can be operated with a small amount of energy. As a result, the efficiency of the refrigeration cycle is improved, and as a result, the energy used by utilizing the chilled air in the indoor 6 can be reduced.

In the schematic view of FIG. 3, FIG. 9 shows FIG. 9 for a fifth refrigeration cycle in which a compressor 62, a blower 64, four-way valves 65 and 66, expansion valves 67 to 69 and solenoid valves 71 to 76 are driven into one refrigeration cycle. It will be described using.

In the configuration of the fifth refrigeration cycle of FIG. 9, the exhaust side refrigerant heat exchanger 32 recovers the heat energy from the indoor air, and the air supply side refrigerant heat exchanger 23 heats the heat, and at the same time, heat exchange for water heating. This is a case where the water stored in the hot water storage tank 82 is heated via the vessel 61. The assumed state is a case where the water in the hot water storage tank 82 is also heated at the same time as the ventilation device 1 is heated in winter.

In the case of the fifth refrigeration cycle, even if the refrigerant circulates in the water heating heat exchanger 61, if the circulation pump 81 is not circulated, water is discharged from the refrigerant in the water heating heat exchanger 61. There is no heat exchange to, in this case only heating.

In the air supply part of the ventilation device 1, the air supply blower 25 is driven to open only the damper 41 of the first outside air port 21, the first air supply port 26 and the first return air port 28, and the exhaust part exhausts. The blower 35 is driven, and only the damper 41 of the first exhaust port 36 is opened. The outside air warmed by the roof air passage 9 is sent to the underfloor 8 and the air in the indoor 6 is convected to heat the entire indoor 6.

Since it is winter, it is often not possible to sufficiently heat the roof air passage 9, so the air supply side refrigerant heat exchanger 23 is operated in the refrigeration cycle described later to compensate for the insufficient heating amount. There is. Further, the damper 41 of the first return port 28 of the air supply unit can be adjusted by opening the damper 41 when the temperature of the outside air warmed by the roof air passage 9 is too high, but the ventilation volume can be adjusted. When it is necessary to increase the temperature, or when the indoor temperature is lower than the outside air temperature, the damper 41 of the first return air port 28 may be closed or the opening degree may be adjusted in the closing direction.

Next, the state in which the fifth refrigeration cycle of FIG. 9 is driven will be described. The solenoid valves 71, 74, 76 and the expansion valve 68 block the flow path of the refrigerant pipe. When the compressor 62 is driven, the flow path switched by the four-way valves 65 and 66 allows the high-temperature (for example, 70 degrees Celsius) and high-pressure gas refrigerant to be used in the water heating heat exchanger 61 from the discharge side of the compressor 62. Flow to. The water heating heat exchanger 61 exchanges heat with water to lower the temperature (for example, 45 degrees Celsius), becomes a liquid refrigerant, and is further sent to the air supply side refrigerant heat exchanger 23, where the air supply side refrigerant is used. Heating is performed by the heat exchanger 23 and the air supply blower 25.

The liquid refrigerant discharged from the air supply side refrigerant heat exchanger 23 is depressurized by the expansion valve 67, and evaporates while exchanging heat with the indoor air (for example, 20 degrees Celsius) warmed by the exhaust side refrigerant heat exchanger 32. Then it becomes a gaseous refrigerant (for example, 15 degrees Celsius). Further, the outdoor refrigerant heat exchanger 63 exchanges heat with the outside air by the blower 64 to eliminate the insufficient evaporation of the refrigerant, and the flow path switched by the four-way valve 65 returns to the suction side of the compressor 62.

In the exhaust side refrigerant heat exchanger 32, the temperature of the gasified refrigerant is raised by the warmed air (for example, 20 degrees Celsius) of the indoor 6, so that the compressor 62 can be operated with a small amount of energy. The efficiency of the refrigeration cycle is improved, and as a result, energy can be reduced by utilizing the warm air of the indoor 6.

The appearance of the ventilation device 2 of the present invention will be described with reference to FIG. The difference from the ventilation device 1 of the first embodiment is that the second return port 31a is provided with the damper 41, and the other parts are the same as those of the first embodiment, so the same reference numerals are given. The explanation will be omitted.

The arrangement of parts inside the ventilation device 2 will be described with reference to FIG. FIG. 11 shows from FIG. 10 the first outside air port 21, the second outside air port 22, the first return air port 28, the first air supply port 26, the second air supply port 27, the first exhaust port 36, and the second exhaust port 37. It is the figure which showed the state which removed the 2nd return air opening 31a and removed the exterior other than the bottom plate of the ventilation system 2. The shape of the removed portion is represented by a broken line.

An air supply side refrigerant heat exchanger 23 and an exhaust side refrigerant heat exchanger 32 are attached to a portion of the heat exchanger chamber 11, and between the air supply side refrigerant heat exchanger 23 and the exhaust side refrigerant heat exchanger 32. Is provided with a heat exchanger chamber partition plate 16 that divides the heat exchanger chamber 11. A filter 24 is attached to a portion of the filter chamber 12. Further, an air supply blower 25 is attached to the air supply blower room 13, and an exhaust blower 35 is attached to the exhaust blower room 14.

The air supply side refrigerant heat exchanger 23 and the exhaust side refrigerant heat exchanger 32 in the heat exchanger room 11, the filter 24 in the filter room 12, the air supply blower 25 in the air supply blower room 13, and the exhaust blower 35 in the exhaust blower room 14. Is the same as that of the first embodiment, and thus the description thereof will be omitted.

In the second embodiment, the heat exchanger chamber partition plate 16 that divides the heat exchanger chamber 11 is provided with an internal vent 17 provided with a damper 41. When the damper 41 of the second return port 31a is opened and the damper 41 of the internal ventilation port 17 is closed, the state is the same as that of the ventilation device 1, and the same function can be exhibited. Since the same implementation can be performed for the first refrigeration cycle to the fifth refrigeration cycle in Example 1, the description thereof will be omitted, and what can be done only in Example 2 will be described.

The relationship between the ventilation device 2 and the refrigeration cycle in the second embodiment will be described with reference to FIG. The sixth refrigeration cycle configuration of FIG. 12 is an exhaust side refrigerant heat exchanger 32 for water heating by directly recovering heat energy from the outside air warmed by the roof air passage 9 inside the ventilation fan device 2. This is a case where the water stored in the hot water storage tank 82 is heated via the heat exchanger 61. The assumed state is the case where the water inside the hot water storage tank 82 is heated when heating and cooling is not required.

In the air supply unit of the ventilation device 2, only the first outside air port 21 and the damper 41 of the internal ventilation port 17 are opened without driving the air supply blower 25, and in the exhaust unit, the exhaust blower 35 is driven. Only the damper 41 of one exhaust port 36 is open. As a result, the outside air warmed by the roof air passage 9 is sent directly to the exhaust side refrigerant heat exchanger 32, and is sent indoors 6 to directly recover the heat energy from the outside air without dissipating heat, and heat exchange for water heating. The water stored in the hot water storage tank 82 can also be heated via the vessel 61.

Next, the state in which the sixth refrigeration cycle of FIG. 12 is driven will be described. Solenoid valves 73, 74, 75 and expansion valve 67 shut off the flow path of the refrigerant pipe. When the compressor 62 is driven, the flow path switched by the four-way valves 65 and 66 allows the high-temperature (for example, 70 degrees Celsius) and high-pressure gas refrigerant to be used in the water heating heat exchanger 61 from the discharge side of the compressor 62. Flow to. The water heat exchanger 61 exchanges heat with water to lower the temperature (for example, 35 degrees Celsius), which becomes a liquid refrigerant, and the refrigerant decompressed by the expansion valve 68 is evaporated by the exhaust side refrigerant heat exchanger 32. It becomes a gaseous refrigerant whose temperature has been further lowered (for example, 15 degrees Celsius), and returns to the suction side of the compressor 62 by the flow path switched by the four-way valve 65.

In the exhaust side refrigerant heat exchanger 32, the refrigerant can recover heat from the outside air (for example, 30 degrees Celsius) warmed by the roof air passage 9, so that the high temperature and high pressure gas produced by the compressor 62 can be recovered with less power. It can be used as a refrigerant, which improves the efficiency in the refrigeration cycle, and as a result, it is possible to reduce the energy using the outside air warmed by the roof air passage 9.

The numerical values described in the above-mentioned examples are examples, and the numerical values are not limited to these numerical values, and the illustrated temperature changes depending on the type and performance of the members used. It is also possible to switch the refrigerant circuit by using a plurality of solenoid valves instead of using the four-way valves 65 and 66.

1, 2: Ventilator 6: Indoor 7: Ceiling 8: Underfloor 9: Roof air passage 11: Heat exchanger room 12: Filter room 13: Air supply blower room 14: Exhaust blower room 16: Heat exchanger room partition plate 17 : Internal vent 21: First outside air port 22: Second outside air port 23: Air supply side refrigerant heat exchanger 24: Filter 25: Air supply blower 26: First air supply port 27: Second air supply port 28: No. 1st return air port 31, 31a: 2nd return air port 32: Exhaust side refrigerant heat exchanger 35: Exhaust blower 36: 1st exhaust port 37: 2nd exhaust port 41: Damper 51: 1st outside air duct 52: 2nd Outside air duct 53: Air supply duct 56: First exhaust duct 57: Second exhaust duct 61: Heat exchanger for water heating 62: Compressor 63: Outdoor refrigerant heat exchanger 64: Blower 65, 66: Four-way valve 67, 68 , 69: Expansion valve 71-76: Electromagnetic valve 78: Check valve 81: Circulation pump 82: Hot water storage tank 83: Heat exchanger 84: Water supply pipe 85: Hot water supply pipe 86: Hot water tap 87: Bathtub 91: Roof 92: Foundation 93: Wall

Claims (6)

An air supply blower that supplies outside air indoors,
The air supply side refrigerant heat exchanger that exchanges heat between the outside air and the refrigerant,
An exhaust blower that exhausts indoor air from indoors,
An exhaust side refrigerant heat exchanger that exchanges heat between the indoor air and the refrigerant is provided.
The refrigerant passes only through the exhaust side refrigerant heat exchanger, or the refrigerant passes through both the air supply side refrigerant heat exchanger and the exhaust side refrigerant heat exchanger.
A ventilation device in which a refrigeration cycle is formed by a water heating heat exchanger, a compressor, and an expansion valve that exchange heat between refrigerant and water. An air supply blower that supplies outside air indoors,
The air supply side refrigerant heat exchanger that exchanges heat between the outside air and the refrigerant,
An exhaust blower that exhausts indoor air from indoors,
An exhaust side refrigerant heat exchanger that exchanges heat between the indoor air and the refrigerant is provided.
The refrigerant passes only through the exhaust side refrigerant heat exchanger, or the refrigerant passes through both the air supply side refrigerant heat exchanger and the exhaust side refrigerant heat exchanger.
The refrigeration cycle is performed by the water heating heat exchanger, the outdoor refrigerant heat exchanger, the compressor, the four-way valve, and the expansion valve in which the air supply side refrigerant heat exchanger and the exhaust side refrigerant heat exchanger exchange heat between the refrigerant and water. Ventilation device formed. Claim 1 or claim 2 in which a plurality of outside air ports and return air ports to which ducts are attached are provided on the upstream side of the air supply blower, and on-off valves are provided in the plurality of outside air ports and return air ports. The ventilator described. The ventilation device according to claim 1 to 3 , wherein a plurality of exhaust ports to which an exhaust duct is attached are provided on the downstream side of the exhaust blower, and an on-off valve is provided at the plurality of exhaust ports. The ventilation according to claim 1 to 4 , wherein one or more air supply ports to which an air supply duct is attached are provided on the downstream side of the air supply blower, and an on-off valve is provided in the one or more air supply ports. apparatus. The ventilation device according to claim 5, wherein the plurality of outside air ports and return air ports, the plurality of exhaust ports, and the one or more air supply ports are all provided on the outer surface of one housing. ..

Images