Heat exchange type ventilation device

Abstract

The invention provides a heat exchange type ventilation device which improves the efficiency of operation of each of a plurality of operation modes of the heat exchange type ventilation device. In a heat exchange type ventilation device, an air supply air path conveys air supply flow in which air sucked from outside passes through a main body housing and is blown into a room. The exhaust air path conveys an exhaust flow in which air sucked from the inside of the room passes through the inside of the main body housing and is blown out of the room. The return air path conveys return air flow which is obtained by blowing air sucked from the interior of a room into the interior of the room again through the interior of the main body shell. The first heat exchanger performs heat exchange between the supply flow and the exhaust flow. The first temperature adjustment unit cools or heats the supply air flow passing through the first heat exchanger on the basis of the operation mode. The second heat exchanger performs heat exchange between the supply air flow and the return air flow passing through the first temperature adjusting part. The second temperature adjustment unit cools or heats the supply air flow passing through the second heat exchanger on the basis of the operation mode.

Description

Technical Field

[0001] The present invention relates to a heat exchange type ventilator. Background Art

[0002] Conventionally, there is known a heat exchange type ventilator that performs heat exchange between a supply airflow and an exhaust airflow during ventilation (for example, refer to Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-94771 Summary of the invention

[0006] When such a heat exchange type ventilator has a plurality of operation modes, it is desired to improve the efficiency of the operation in each operation mode.

[0007] The present invention solves the above-mentioned problems and provides a technique for improving the efficiency of each of the plurality of operation modes provided in a heat exchange type ventilator.

[0008] A heat exchange type ventilation device according to one embodiment of the present invention has a refrigeration cycle and can set a plurality of operation modes, the heat exchange type ventilation device comprising: an operation mode acquisition unit, which acquires a set operation mode among a plurality of operation modes; a shell, which has an air supply inlet for sucking air from the outside, an air supply outlet for blowing air into the room, an exhaust inlet for sucking air from the room, an exhaust outlet for blowing air to the outside, a return air inlet for sucking air from the room, and a return air outlet for blowing air into the room; an air supply duct, which connects the air supply inlet with the air supply outlet and conveys a supply flow of air sucked from the outside through the shell and blown into the room; an exhaust duct, which connects the exhaust inlet with the exhaust outlet and conveys air sucked from the room to the inside of the shell. an exhaust flow in which the air passes through the shell and is blown outside; a return air duct, which connects the return air intake port with the return air blowout port, and conveys the return air flow in which the air sucked from the room passes through the shell and is blown into the room again; a first heat exchanger, which performs heat exchange between the supply air flow and the exhaust air flow; a first temperature regulating unit, which belongs to the refrigeration cycle, and based on the operation mode obtained by the operation mode acquisition unit, cools or heats the supply air flow after passing through the first heat exchanger; a second heat exchanger, which performs heat exchange between the supply air flow after passing through the first temperature regulating unit and the return air flow; and a second temperature regulating unit, which belongs to the refrigeration cycle, and based on the operation mode obtained by the operation mode acquisition unit, cools or heats the supply air flow after passing through the second heat exchanger.

[0009] It should be noted that arbitrary combinations of the above-described constituting elements and embodiments in which the expressions of the present invention are converted into methods, apparatuses, systems, recording media, computer programs, and the like are also additionally effective as embodiments of the present invention.

[0010] According to the present invention, it is possible to improve the efficiency of the operation in each of the plurality of operation modes included in a heat exchange type ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1A This is a diagram showing a configuration in a dehumidification operation mode in the heat exchange ventilator according to the embodiment of the present invention.

[0012] Figure 1B This is a diagram showing an outline of the operation in the dehumidification operation mode in the heat exchange ventilator according to the embodiment of the present invention.

[0013] Figure 2A This is a diagram showing a configuration in a cooling operation mode in the heat exchange ventilator according to the embodiment of the present invention.

[0014] Figure 2B This is a diagram showing an outline of the operation in the cooling operation mode of the heat exchange ventilator according to the embodiment of the present invention.

[0015] Figure 3A It is a diagram showing a configuration in a heating operation mode in the heat exchange type ventilator according to the embodiment of the present invention.

[0016] Figure 3B It is a diagram showing an outline of the operation in the heating operation mode of the heat exchange type ventilator according to the embodiment of the present invention.

[0017] Figure 4 This is a flowchart showing the operation process of the heat exchange ventilator according to the embodiment of the present invention.

[0018] Figure 5A This is a diagram showing an outline of the operation in the dehumidification operation mode of the heat exchange type ventilator according to Modification 1 of the embodiment of the present invention.

[0019] Figure 5B This is a diagram showing an outline of the operation of the heat exchange ventilator in the cooling operation mode according to Modification 1 of the embodiment of the present invention.

[0020] Figure 5C This is a diagram showing an outline of the operation of the heat exchange type ventilator in the heating operation mode according to Modification 1 of the embodiment of the present invention.

[0021] Figure 6 This is a flowchart showing the operation process of the heat exchange ventilator according to Modification 1 of the embodiment of the present invention.

[0022] Figure 7 It is a diagram showing an outline of the operation of the heat exchange type ventilator according to Modification 2 of the embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 1 Heat exchange type ventilation device

[0025] 2 Exhaust flow

[0026] 3 Supply air flow

[0027] 4 Return air flow

[0028] 6 Exhaust air duct

[0029] 7 Air supply duct

[0030] 8 Return air duct

[0031] 10 Indoor unit

[0032] 11 Main body shell

[0033] 12. First heat exchanger

[0034] 14 Exhaust Inlet

[0035] 15 Exhaust outlet

[0036] 17 Air supply inlet

[0037] 18 Air supply outlet

[0038] 20 Control device

[0039] 30 Refrigeration cycle

[0040] 31 Compressor

[0041] 32 Outdoor unit

[0042] 33 Expander

[0043] 33a First expander

[0044] 33b Second expander

[0045] 34. First temperature adjustment unit

[0046] 34a First evaporator

[0047] 34b First condenser

[0048] 35 Second heat exchanger

[0049] 38 Second temperature adjustment unit

[0050] 38a Second evaporator

[0051] 38b Second condenser

[0052] 39 Outdoor unit temperature control unit

[0053] 39a Outdoor evaporator

[0054] 39b Outdoor condenser

[0055] 41 Four-way valve

[0056] 50 Supply air temperature sensor

[0057] 52 Indoor temperature sensor

[0058] 60 Return air inlet

[0059] 62 Return air outlet

[0060] 64 Return air inhalation switch

[0061] 70 Return air duct switching unit

[0062] 72 Heat exchange return air duct

[0063] 74 Bypass return air duct

[0064] 80 Confluence Road

[0065] 82 Branch Location

[0066] 84 confluence position

[0067] Steps S10 to S70. DETAILED DESCRIPTION

[0068] Hereinafter, embodiments and variations of the present invention will be described with reference to the accompanying drawings. The embodiments and variations described below all illustrate a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, configuration positions and connection methods of constituent elements, steps (processes) and the order of steps shown in the following embodiments and variations are examples and are not intended to limit the present invention. Therefore, the constituent elements of the following embodiments and variations that are not recorded in the independent technical solutions representing the highest concept of the present invention are described as arbitrary constituent elements. In addition, in each figure, substantially the same structure is marked with the same figure mark, and repeated descriptions are omitted or simplified.

[0069] Figure 1A This is a diagram showing a configuration in a dehumidification operation mode in the heat exchange ventilator 1 according to the embodiment of the present invention.

[0070] Figure 1AThe structure of the heat exchange type ventilator 1 is shown. The heat exchange type ventilator 1 includes an indoor unit 10 and an outdoor unit 32 .

[0071] The outdoor unit 32 is a device that compresses and expands the refrigerant. The outdoor unit 32 is installed outdoors. The outdoor (outside the house) is the outside of the building, and the indoor (inside the house) is the inside of the building. The outdoor unit 32 forms a refrigeration cycle 30 that circulates the refrigerant between the indoor unit 10 and the outdoor unit 32.

[0072] Here, in the refrigeration cycle 30, for example, a freon substitute (HFC134a) is used as a refrigerant. In addition, in the connection of each device constituting the refrigeration cycle 30, for example, a welding method using a copper pipe is adopted. The outdoor unit 32 includes a compressor 31, a first expander 33a constituting an expander 33, an outdoor unit temperature adjustment unit 39 (outdoor evaporator 39a, outdoor condenser 39b), and a four-way valve 41. In addition, in the refrigeration cycle 30, a second expander 33b constituting the expander 33 is provided on the indoor unit 10 side.

[0073] The compressor 31 belongs to the refrigeration cycle 30 and is a device that pressurizes the refrigerant to increase the temperature of the refrigerant. The compressor 31 circulates the refrigerant in the refrigeration cycle 30 by pressurizing the refrigerant.

[0074] The first expander 33a belongs to the refrigeration cycle 30 and is a device for reducing the temperature of the refrigerant by decompressing the refrigerant. The first expander 33a can switch between an expansion state in which the refrigerant is expanded by decompressing the refrigerant and an open state in which the refrigerant is allowed to pass without decompressing the refrigerant.

[0075] The second expander 33b belongs to the refrigeration cycle 30 and is a device for reducing the temperature of the refrigerant by decompressing the refrigerant. The second expander 33b can switch between an expansion state in which the refrigerant is decompressed to expand the refrigerant and an open state in which the refrigerant is not decompressed.

[0076] The outdoor unit temperature adjustment unit 39 uses the external air to cool or heat the refrigerant passing through. The outdoor unit temperature adjustment unit 39 functions as an outdoor evaporator 39a and an outdoor condenser 39b. The outdoor unit temperature adjustment unit 39 is arranged in the internal flow path of the outdoor unit 32 and is arranged between the expander 33 (first expander 33a) and the four-way valve 41 described later in the refrigeration cycle 30. When the outdoor unit temperature adjustment unit 39 functions as the outdoor evaporator 39a, the expanded low-temperature refrigerant is introduced and the cold air is released to the outside (external air), thereby heating the refrigerant. On the other hand, when the outdoor unit temperature adjustment unit 39 functions as the outdoor condenser 39b, the condensed high-temperature refrigerant is introduced and the heat is released to the outside, thereby cooling the refrigerant.

[0077] The four-way valve 41 belongs to the refrigeration cycle 30 and is a member for switching the flow path of the refrigerant sent from the compressor 31. The four-way valve 41 can switch the flow path of the compressed refrigerant to the first temperature adjustment unit 34 described later and the flow path of the compressed refrigerant to the outdoor unit temperature adjustment unit 39.

[0078] When the compressed refrigerant is caused to flow to the first temperature regulating part 34, the four-way valve 41 guides the refrigerant flowing from the outdoor unit temperature regulating part 39 into the four-way valve 41 to the compressor 31, and guides the refrigerant flowing from the compressor 31 into the four-way valve 41 to the first temperature regulating part 34. On the other hand, when the compressed refrigerant is caused to flow to the outdoor unit temperature regulating part 39, the four-way valve 41 guides the refrigerant flowing from the first temperature regulating part 34 into the four-way valve 41 to the compressor 31, and guides the refrigerant flowing from the compressor 31 into the four-way valve 41 to the outdoor unit temperature regulating part 39.

[0079] The indoor unit 10 exhausts air to the outside and supplies air to the inside. The indoor unit 10 includes a main body casing 11, an exhaust air inlet 14, an exhaust air outlet 15, an exhaust air duct 6, a supply air inlet 17, a supply air outlet 18, a supply air duct 7, a return air inlet 60, a return air outlet 62, a return air duct 8, a first heat exchanger 12, a second heat exchanger 35, a first temperature adjustment unit 34, a second temperature adjustment unit 38, a second expander 33b, and a control device 20. In addition, the indoor unit 10 also includes an exhaust fan, a supply air fan, and a return air fan, which are not shown.

[0080] The main body casing 11 is an outer frame (casing) of the indoor unit 10. The main body casing 11 is formed in a hollow box shape, for example.

[0081] The exhaust air inlet 14 is an inlet for sucking the exhaust air flow 2 (air) from the room into the indoor unit 10. The exhaust air inlet 14 is provided in a circular shape, for example, and a duct is connected to the exhaust air inlet 14.

[0082] The exhaust outlet 15 is an outlet for blowing the exhaust air 2 (air) from the indoor unit 10 to the outside. The exhaust outlet 15 is provided in a circular shape, for example, and a duct is connected to the exhaust outlet 15 .

[0083] The exhaust air passage 6 is an air supply passage that connects the exhaust air inlet 14 and the exhaust air outlet 15. Therefore, the exhaust air passage 6 conveys the exhaust air flow 2 that flows from the inside of the house to the outside of the house.

[0084] The exhaust fan (not shown) is a blower that guides the exhaust flow 2 sucked from the exhaust suction port 14 to the exhaust blowout port 15. The exhaust fan is constituted by, for example, a sirocco fan.

[0085] The supply air inlet 17 is an inlet for sucking the supply air flow 3 (air) from the outside into the indoor unit 10. The supply air inlet 17 is provided in a circular shape, for example, and a duct is connected to the supply air inlet 17.

[0086] The supply air outlet 18 is an outlet for blowing the supply air flow 3 (air) from the indoor unit 10 to each room in the house. The supply air outlet 18 is provided in a circular shape, for example, and a duct is connected to the supply air outlet 18 .

[0087] The air supply passage 7 is an air supply passage that connects the air supply inlet 17 with the air supply outlet 18. Therefore, the air supply passage 7 conveys the air supply flow 3 from the outside to the inside of the room.

[0088] The air supply fan (not shown) is a blower that guides the supply air flow 3 sucked from the air supply inlet 17 to the air supply outlet 18. The air supply fan is constituted by, for example, a sirocco fan.

[0089] The return air inlet 60 is an inlet for sucking the return air flow 4 (air) from the room into the indoor unit 10. The return air inlet 60 is provided in a circular shape, for example, and a duct is connected to the return air inlet 60.

[0090] The return air outlet 62 is an outlet for blowing the return air flow 4 (air) from the indoor unit 10 to each room in the house. The return air outlet 62 is provided in a circular shape, for example, and a duct is connected to the return air outlet 62 .

[0091] The return air passage 8 is an air supply passage that connects the return air inlet 60 with the return air outlet 62. Therefore, the return air passage 8 conveys the return air flow 4 that is sucked in from the room, passes through the main body casing 11, and is blown out again into the room.

[0092] The return air fan (not shown) is a blower that guides the return air flow 4 sucked from the return air suction port 60 to the return air outlet 62. The return air fan is constituted by, for example, a Sirocco fan.

[0093] The first heat exchanger 12 performs heat exchange between the exhaust gas flow 2 and the supply gas flow 3 .

[0094] The first temperature regulating part 34 is connected to the first heat exchanger 12 and belongs to the refrigeration cycle 30. The first temperature regulating part 34 functions as a first evaporator 34a and a first condenser 34b. When the first temperature regulating part 34 functions as the first evaporator 34a, the expanded low-temperature refrigerant is introduced to cool the supply air flow 3 after passing through the first heat exchanger 12. On the other hand, when the first temperature regulating part 34 functions as the first condenser 34b, the condensed high-temperature refrigerant is introduced to heat the supply air flow 3 after passing through the first heat exchanger 12.

[0095] The second heat exchanger 35 is connected to the first temperature regulating part 34. The second heat exchanger 35 performs heat exchange between the supply airflow 3 and the return airflow 4 after passing through the first temperature regulating part 34 and before passing through the second temperature regulating part 38. The second heat exchanger 35 is, for example, a plate heat exchanger.

[0096] The second temperature regulating section 38 is connected to the second heat exchanger 35 and belongs to the refrigeration cycle 30. The second temperature regulating section 38 functions as a second evaporator 38a and a second condenser 38b. When the second temperature regulating section 38 functions as the second evaporator 38a, the expanded low-temperature refrigerant is introduced to cool the supply air flow 3 after passing through the first temperature regulating section 34 (second heat exchanger 35). On the other hand, when the second temperature regulating section 38 functions as the second condenser 38b, the condensed high-temperature refrigerant is introduced to heat the supply air flow 3 after passing through the first temperature regulating section 34 (second heat exchanger 35).

[0097] Heat exchange ventilator 1 can realize a plurality of operation modes by controlling first temperature adjustment unit 34 and second temperature adjustment unit 38 of refrigeration cycle 30. The plurality of operation modes include, for example, a cooling operation mode, a heating operation mode, and a dehumidification operation mode.

[0098] The control device 20 controls the compressor 31, the first expander 33a, and the second expander 33b independently. In other words, the control device 20 controls the heating or cooling in the first temperature regulating unit 34 and the heating or cooling in the second temperature regulating unit 38 belonging to the refrigeration cycle 30 independently. In addition, the control device 20 can control the four-way valve 41 to switch the direction of the circulation in the refrigeration cycle 30. In this way, the control device 20 controls multiple operation modes. It should be noted that in the present embodiment, the control device 20 is built into the indoor unit 10, but can also be arranged outside the indoor unit 10.

[0099] Furthermore, the main body casing 11 is also provided with an inclined bottom surface and a water receiving portion (not shown).

[0100] The inclined bottom surface is a portion of the bottom surface of the main body casing 11, and is inclined so that moisture generated inside the indoor unit 10 flows toward a side surface (not shown) of the main body casing 11. The inclined bottom surface is provided vertically below the second heat exchanger 35, the first temperature adjustment unit 34, and the second temperature adjustment unit 38.

[0101] The water receiving part is a member for collecting the water guided to one side surface by the inclined bottom surface. The water receiving part is provided on one side surface of the main body casing 11. The water receiving part is connected to a discharge hose, for example, so that the collected water can be discharged to the outside.

[0102] First, the operation of the heat exchange type ventilator 1 in the dehumidification operation mode among the plurality of operation modes will be described. When the set operation mode is the dehumidification operation mode, in the refrigeration cycle 30, the refrigerant circulates in the order of the compressor 31, the four-way valve 41, the outdoor unit temperature adjustment unit 39, the first expander 33a, the second temperature adjustment unit 38, the second expander 33b, the first temperature adjustment unit 34, the four-way valve 41, and the compressor 31. In addition, in the dehumidification operation mode, the first expander 33a is in an open state where the refrigerant is not depressurized, and the second expander 33b is in an expanded state where the refrigerant is depressurized.

[0103] Here, the outdoor unit temperature control unit 39 imports the refrigerant compressed by the compressor 31 to function as a condenser (outdoor condenser 39b). In addition, the first temperature control unit 34 imports the refrigerant compressed by the second expander 33b to function as an evaporator (first evaporator 34a). In addition, the second temperature control unit 38 imports the refrigerant compressed by the compressor 31 to function as a condenser (second condenser 38b).

[0104] As a result, the structure inside the main housing 11 is as follows Figure 1B shown.

[0105] Figure 1B 1 is a diagram showing an outline of the operation of the heat exchange ventilator 1 in the dehumidification operation mode.

[0106] The elements are arranged in the order of the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35 and the second condenser 38b from the supply air intake port 17 toward the supply air outlet 18. The supply air passage 7 is connected to the supply air outlet 18 from the supply air intake port 17 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35 and the second condenser 38b. In addition, the exhaust air passage 6 is connected to the exhaust air outlet 15 from the exhaust air intake port 14 via the first heat exchanger 12. Moreover, the return air passage 8 is connected to the return air outlet 62 from the return air intake port 60 via the second heat exchanger 35. It should be noted that the return air passage 8 can also pass through the second condenser 38b (the second temperature regulating unit 38).

[0107] Here, a return air inlet 60 of the return air duct 8 is provided with a return air inlet switch 64. The return air inlet switch 64 is an openable and closable cover, and switches the return air inlet 60 between open and closed.

[0108] The supply air flow temperature sensor 50 detects the temperature of the supply air flow 3 after passing through the first temperature adjustment unit 34 (first evaporator 34a) and before passing through the second heat exchanger 35. The supply air flow temperature sensor 50 has a communication function and transmits the detected temperature of the supply air flow 3 to the control device 20 (see Figure 1A )send.

[0109] The indoor temperature sensor 52 detects the indoor temperature. The indoor temperature sensor 52 may also detect the temperature of the return air flow 4 near the return air inlet 60 in the return air duct 8 as the indoor temperature. The indoor temperature sensor 52 has a communication function and transmits the detected indoor temperature to the control device 20 (see Figure 1A )send.

[0110] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50 , and receives the indoor temperature from the indoor temperature sensor 52 .

[0111] In addition, the control device 20 includes an operation mode acquisition unit (not shown), which acquires the operation mode in the setting. It should be noted that the operation mode is any mode of the dehumidification operation mode, the cooling operation mode and the heating operation mode, but is not limited to these. In addition, the operation mode is set by the user, for example.

[0112] When the operation mode acquired by the operation mode acquisition unit is the dehumidification operation mode, the control device 20 operates the first temperature adjustment unit 34 as the first evaporator 34a, operates the second temperature adjustment unit 38 as the second condenser 38b, and operates the outdoor unit temperature adjustment unit 39 as the outdoor condenser 39b as described above.

[0113] When the operation mode acquired by the operation mode acquisition unit is the dehumidification operation mode, the control device 20 selects the open state of the return air inlet 60 and does not select the closed state regardless of the detection results of the supply air flow temperature sensor 50 and the indoor temperature sensor 52. The control device 20 sends the selection result to the return air inlet switching unit 64. The return air inlet switching unit 64 has a communication function, and sets the return air inlet 60 to the open state based on the selection result received from the control device 20. In this way, the return air inlet switching unit 64 switches the opening and closing of the return air inlet 60 based on the operation mode acquired by the operation mode acquisition unit.

[0114] The supply air flow 3 sucked from the supply air inlet 17 is cooled (precooled) in the first heat exchanger 12 by heat exchange with the exhaust air flow 2. The supply air flow 3 from the first heat exchanger 12 is cooled by the first evaporator 34a. As a result, the temperature of the supply air flow 3 becomes below the dew point temperature, and the supply air flow 3 condenses, so that the moisture of the supply air flow 3 is removed. That is, by causing the supply air flow 3 to flow to the first evaporator 34a, dehumidification of the supply air flow 3 is performed. The moisture generated by the first evaporator 34a inside the indoor unit 10 is collected by the water receiving portion and discharged to the outside.

[0115] The supply air flow 3 from the first evaporator 34a performs heat exchange with the return air flow 4 in the second heat exchanger 35. Thus, the supply air flow 3 is heated. The supply air flow 3 from the second heat exchanger 35 is heated by the second condenser 38b, thereby suppressing an excessive temperature drop caused by dehumidification.

[0116] On the other hand, the exhaust gas flow 2 sucked from the exhaust gas suction port 14 performs heat exchange with the supply gas flow 3 in the first heat exchanger 12. Thus, the exhaust gas flow 2 is heated.

[0117] The return air flow 4 sucked from the return air inlet 60 performs heat exchange with the supply air flow 3 in the first heat exchanger 12, and the heat-exchanged return air flow 4 returns to the room from the return air outlet 62. In this way, part of the indoor air blown out from the heat exchange type ventilator 1 is circulated, thereby improving the dehumidification efficiency.

[0118] Next, a description will be given of a case where heat exchange ventilator 1 operates in a cooling operation mode among a plurality of operation modes.

[0119] Figure 2A The configuration of heat exchange ventilator 1 in a cooling operation mode is shown. Figure 2A The structure of the heat exchange type ventilator 1 is shown.

[0120] When the set operation mode is the cooling operation mode, in the refrigeration cycle 30, the refrigerant circulates in the order of the compressor 31, the four-way valve 41, the outdoor unit temperature adjustment unit 39, the first expander 33a, the second temperature adjustment unit 38, the second expander 33b, the first temperature adjustment unit 34, the four-way valve 41, and the compressor 31. In the cooling operation mode, the first expander 33a and the second expander 33b are in an expansion state in which the refrigerant is decompressed.

[0121] Here, the outdoor unit temperature control unit 39 imports the refrigerant compressed by the compressor 31 and functions as a condenser (outdoor condenser 39b). In addition, the first temperature control unit 34 imports the refrigerant expanded by the second expander 33b and functions as an evaporator (first evaporator 34a). In addition, the second temperature control unit 38 imports the refrigerant expanded by the first expander 33a and functions as an evaporator (second evaporator 38a).

[0122] As a result, the structure inside the main housing 11 is as follows Figure 2B shown.

[0123] Figure 2B 1 is a diagram showing an outline of the operation of heat exchange ventilator 1 in the cooling operation mode.

[0124] The elements are arranged in the order of the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a from the supply air intake port 17 toward the supply air outlet 18. The supply air passage 7 is connected to the supply air outlet 18 from the supply air intake port 17 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a. In addition, the exhaust air passage 6 is connected to the exhaust air outlet 15 from the exhaust air intake port 14 via the first heat exchanger 12. Moreover, the return air passage 8 is connected to the return air outlet 62 from the return air intake port 60 via the second heat exchanger 35.

[0125] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50, and receives the indoor temperature from the indoor temperature sensor 52. In addition, when the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, the control device 20 operates the first temperature adjustment unit 34 as the first evaporator 34a, operates the second temperature adjustment unit 38 as the second evaporator 38a, and operates the outdoor unit temperature adjustment unit 39 as the outdoor condenser 39b as described above.

[0126] When the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, the control device 20 selects the open state of the return air inlet 60 if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, and selects the closed state of the return air inlet 60 if the temperature of the supply air flow 3 is lower than the temperature of the air in the room. The control device 20 sends the selection result to the return air inlet switching unit 64.

[0127] The return air intake switch 64 selects the open state or the closed state of the return air intake port 60 based on the selection result received from the control device 20. That is, if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the return air intake switch 64 opens the return air intake port 60. As a result, the return air flow 4 flows in the second heat exchanger 35. On the other hand, if the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the return air intake switch 64 closes the return air intake port 60. As a result, the return air flow 4 does not flow in the second heat exchanger 35.

[0128] It should be noted that the control device 20 may also determine the opening of the return air intake switch 64 to be, for example, "0.5" (50%) based on the temperature of the supply air flow 3 and the temperature in the room. The return air outlet 62 may also adjust the opening of the return air intake port 60 based on the information on the opening received from the control device 20.

[0129] Thus, the return air intake switch 64 switches the opening and closing of the return air intake port 60 based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow 3 acquired by the supply air flow temperature sensor 50 , and the temperature of the indoor air acquired by the indoor temperature sensor 52 .

[0130] The supply air flow 3 sucked from the supply air intake port 17 is cooled (precooled) in the first heat exchanger 12 by heat exchange with the exhaust air flow 2. The supply air flow 3 from the first heat exchanger 12 is cooled by the first evaporator 34a. When the temperature of the supply air flow 3 is higher than the temperature in the room, the supply air flow 3 from the first evaporator 34a performs heat exchange with the return air flow 4 in the second heat exchanger 35. Thus, the supply air flow 3 is cooled. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature in the room, the heat exchange in the second heat exchanger 35 is not performed. Furthermore, the supply air flow 3 is also cooled by the second evaporator 38a.

[0131] On the other hand, the exhaust gas flow 2 sucked in from the exhaust gas suction port 14 performs heat exchange with the supply gas flow 3 in the first heat exchanger 12. As a result, the exhaust gas flow 2 is heated. When the temperature of the supply gas flow 3 is higher than the temperature in the room, the return gas flow 4 sucked in from the return gas suction port 60 performs heat exchange with the supply gas flow 3 in the second heat exchanger 35, and the return gas flow 4 that has performed heat exchange returns to the room from the return gas outlet 62. On the other hand, when the temperature of the supply gas flow 3 is lower than the temperature in the room, the return gas flow 4 is not sucked in from the return gas suction port 60. In this way, the supply gas flow 3 is cooled using the return gas flow 4, so the cooling efficiency is improved.

[0132] Next, a description will be given of a case where heat exchange ventilator 1 operates in a heating operation mode among a plurality of operation modes.

[0133] Figure 3A 1 is a diagram showing a configuration of heat exchange ventilator 1 in a heating operation mode. Figure 3A The structure of the heat exchange type ventilator 1 is shown.

[0134] When the set operation mode is the heating operation mode, the refrigerant circulates in the refrigeration cycle 30 in the order of the compressor 31, the four-way valve 41, the first temperature adjustment unit 34, the second expander 33b, the second temperature adjustment unit 38, the first expander 33a, the outdoor unit temperature adjustment unit 39, the four-way valve 41, and the compressor 31. In the case of the heating operation mode, the first expander 33a is in an expansion state in which the refrigerant is depressurized, and the second expander 33b is in an open state in which the refrigerant is not depressurized.

[0135] Here, the outdoor unit temperature control unit 39 imports the refrigerant expanded by the first expander 33a to function as an evaporator (outdoor evaporator 39a). In addition, the first temperature control unit 34 imports the refrigerant compressed by the compressor 31 to function as a condenser (first condenser 34b). In addition, the second temperature control unit 38 also imports the refrigerant compressed by the compressor 31 to function as a condenser (second condenser 38b).

[0136] As a result, the structure inside the main housing 11 is as follows Figure 3B shown.

[0137] Figure 3B 1 is a diagram showing an outline of the operation of heat exchange ventilator 1 in the heating operation mode.

[0138] The elements are arranged in the order of the first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b from the supply air intake port 17 toward the supply air outlet 18. The supply air passage 7 is connected to the supply air outlet 18 from the supply air intake port 17 via the first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b. In addition, the exhaust air passage 6 is connected to the exhaust air outlet 15 from the exhaust air intake port 14 via the first heat exchanger 12. Moreover, the return air passage 8 is connected to the return air outlet 62 from the return air intake port 60 via the second heat exchanger 35.

[0139] The control device 20 receives the temperature of the supply air flow 3 from the supply air flow temperature sensor 50, and receives the indoor temperature from the indoor temperature sensor 52. In addition, when the operation mode acquired by the operation mode acquisition unit is the heating operation mode, the control device 20 operates the first temperature adjustment unit 34 as the first condenser 34b, operates the second temperature adjustment unit 38 as the second condenser 38b, and operates the outdoor unit temperature adjustment unit 39 as the outdoor evaporator 39a as described above.

[0140] When the operation mode acquired by the operation mode acquisition unit is the heating operation mode, the control device 20 selects the closed state of the return air inlet 60 if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, and selects the open state of the return air inlet 60 if the temperature of the supply air flow 3 is lower than the temperature of the air in the room. The control device 20 sends the selection result to the return air inlet switching unit 64.

[0141] The return air intake switch 64 selects the open state or the closed state of the return air intake port 60 based on the selection result received from the control device 20. That is, if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the return air intake switch 64 closes the return air intake port 60. As a result, the return air flow 4 does not flow in the second heat exchanger 35. On the other hand, if the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the return air intake switch 64 opens the return air intake port 60. As a result, the return air flow 4 flows in the second heat exchanger 35.

[0142] It should be noted that the control device 20 may also determine the opening of the return air intake switch 64 to be, for example, "0.5" (50%) according to the temperature of the supply air flow 3 and the temperature in the room. The return air outlet 62 may also adjust the opening of the return air intake port 60 based on the information on the opening received from the control device 20.

[0143] Thus, the return air intake switch 64 switches the opening and closing of the return air intake port 60 based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow 3 acquired by the supply air flow temperature sensor 50 , and the temperature of the indoor air acquired by the indoor temperature sensor 52 .

[0144] The supply air flow 3 sucked from the supply air intake port 17 is heated in the first heat exchanger 12 by heat exchange with the exhaust air flow 2. The supply air flow 3 from the first heat exchanger 12 is heated by the first condenser 34b. When the temperature of the supply air flow 3 is higher than the temperature in the room, the heat exchange in the second heat exchanger 35 is not performed. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature in the room, the supply air flow 3 from the first evaporator 34a performs heat exchange with the return air flow 4 in the second heat exchanger 35. As a result, the supply air flow 3 is heated. Furthermore, the supply air flow 3 is also heated by the second condenser 38b.

[0145] On the other hand, the exhaust gas flow 2 sucked in from the exhaust gas suction port 14 performs heat exchange with the supply gas flow 3 in the first heat exchanger 12. As a result, the exhaust gas flow 2 is cooled. When the temperature of the supply gas flow 3 is higher than the temperature in the room, the return gas flow 4 is not sucked in from the return air suction port 60. On the other hand, when the temperature of the supply gas flow 3 is lower than the temperature in the room, the return gas flow 4 sucked in from the return air suction port 60 performs heat exchange with the supply gas flow 3 in the second heat exchanger 35, and the return gas flow 4 that has performed heat exchange returns to the room from the return air outlet 62. In this way, the supply gas flow 3 is heated using the return gas flow 4, so the heating efficiency is improved.

[0146] Figure 4 It is a flowchart showing the operation process of the heat exchange ventilator 1 according to the embodiment of the present invention.

[0147] When the operation of heat exchange ventilator 1 starts ( S10 ), the operation mode acquisition unit acquires the set operation mode ( S12 ).

[0148] When the operation mode is the dehumidification operation mode (S14: Yes), the return air intake switch 64 opens the return air intake port 60 (S16). On the other hand, when the operation mode is not the dehumidification operation mode (S14: No) but the cooling operation mode (S18: Yes), if the temperature of the supply air flow 3 is not higher than the indoor temperature (S20: No), the return air intake switch 64 closes the return air intake port 60 (S22).

[0149] On the other hand, if the temperature of the supply air flow 3 is equal to or higher than the indoor temperature in step S20 (YES in S20 ), the return air intake switch 64 opens the return air intake port 60 ( S24 ).

[0150] In addition, when the operation mode is not the cooling operation mode in step S18 (No in S18), if the temperature of the supply air flow 3 is not lower than the indoor temperature (No in S26), the return air intake switch 64 closes the return air intake port 60 (S28). On the other hand, if the temperature of the supply air flow 3 is lower than the indoor temperature in step S26 (Yes in S26), the return air intake switch 64 opens the return air intake port 60 (S30).

[0151] (Variant 1)

[0152] Next, a modification 1 of the embodiment of the present invention will be described. Figure 1B , Figure 2B as well as Figure 3B In the illustrated example, the return air intake switch 64 controls the flow of the return air flow 4 into the return air duct 8 , thereby controlling whether or not to perform heat exchange between the supply air flow 3 and the return air flow 4 .

[0153] On the other hand, in the first modification, the return air duct 8 includes the heat exchange return air duct 72 and the bypass return air duct 74 , and the heat exchange return air duct 72 and the bypass return air duct 74 are switched to control whether heat exchange is performed between the supply airflow 3 and the return airflow 4 .

[0154] Figure 5A to Figure 5C Each of these is a diagram showing an outline of the operation of the heat exchange ventilator 1 in the first modification.

[0155] Figure 5A This is a diagram showing an outline of the operation in the dehumidification operation mode in Modification 1.

[0156] As before, the elements are arranged in the order of the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b from the air supply inlet 17 toward the air supply outlet 18. The air supply duct 7 is connected to the air supply outlet 18 from the air supply inlet 17 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second condenser 38b. In addition, the exhaust duct 6 is connected to the exhaust outlet 15 from the exhaust inlet 14 via the first heat exchanger 12.

[0157] A return air passage switch 70 is provided in the return air passage 8 from the return air outlet 62 at a position before passing through the second heat exchanger 35. The return air passage 8 is branched into a heat exchange return air passage 72 and a bypass return air passage 74 at the return air passage switch 70. The heat exchange return air passage 72 is a passage for allowing the return air flow 4 to pass through the second heat exchanger 35, and the bypass return air passage 74 is a passage for allowing the return air flow 4 to bypass the second heat exchanger 35. Moreover, the heat exchange return air passage 72 and the bypass return air passage 74 are connected at a position where the return air flow 4 passes through the second heat exchanger 35.

[0158] When the operation mode acquired by the operation mode acquisition unit is the dehumidification operation mode, the control device 20 selects the heat exchange return air duct 72 and does not select the bypass return air duct 74 regardless of the detection results of the supply air flow temperature sensor 50 and the indoor temperature sensor 52. The control device 20 sends the selection result to the return air duct switching unit 70.

[0159] The return air duct switching unit 70 has a communication function, and selects the heat exchange return air duct 72 based on the selection result received from the control device 20, and causes the heat exchange return air duct 72 to convey the return air flow 4. In this way, the return air duct switching unit 70 switches the heat exchange return air duct 72 and the bypass return air duct 74 based on the operation mode acquired by the operation mode acquisition unit.

[0160] The supply air flow 3 sucked from the supply air intake port 17 , the exhaust air flow 2 sucked from the exhaust air intake port 14 , and the return air flow 4 sucked from the return air intake port 60 are transported in the same manner as described above, and thus description thereof is omitted here.

[0161] Figure 5B This is a diagram showing an outline of the operation in the cooling operation mode according to Modification 1.

[0162] As before, the elements are arranged in the order of the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a from the air supply inlet 17 toward the air supply outlet 18. The air supply duct 7 is connected to the air supply outlet 18 from the air supply inlet 17 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35, and the second evaporator 38a. In addition, the exhaust duct 6 is connected to the exhaust outlet 15 from the exhaust inlet 14 via the first heat exchanger 12.

[0163] When the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the control device 20 selects the heat exchange return air duct 72. On the other hand, when the operation mode acquired by the operation mode acquisition unit is the cooling operation mode, if the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the control device 20 selects the bypass return air duct 74. The control device 20 sends the selection result to the return air duct switching unit 70.

[0164] The return air passage switch 70 switches the heat exchange return air passage 72 and the bypass return air passage 74 based on the selection result received from the control device 20. That is, when the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the return air passage switch 70 opens the heat exchange return air passage 72 and closes the bypass return air passage 74. Thus, the heat exchange return air passage 72 conveys the return air flow 4. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the return air passage switch 70 closes the heat exchange return air passage 72 and opens the bypass return air passage 74. Thus, the bypass return air passage 74 conveys the return air flow 4.

[0165] In this way, the return air duct switching unit 70 switches the heat exchange return air duct 72 and the bypass return air duct 74 based on the operation mode obtained by the operation mode acquisition unit, the temperature of the supply air flow 3 obtained by the supply air flow temperature sensor 50 and the temperature of the indoor air obtained by the indoor temperature sensor 52.

[0166] The supply air flow 3 sucked from the supply air intake port 17 and the exhaust air flow 2 sucked from the exhaust air intake port 14 are delivered in the same manner as described above, and thus description thereof will be omitted here.

[0167] In addition, when the temperature of the supply air flow 3 is higher than the temperature in the room, the return air flow 4 sucked from the return air inlet 60 passes through the heat exchange return air passage 72, thereby performing heat exchange with the supply air flow 3 in the second heat exchanger 35. The return air flow 4 that has performed heat exchange returns to the room from the return air outlet 62. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature in the room, the return air flow 4 sucked from the return air inlet 60 passes through the bypass return air passage 74, thereby not performing heat exchange with the supply air flow 3 in the second heat exchanger 35. The return air flow 4 that has not performed heat exchange returns to the room from the return air outlet 62.

[0168] Figure 5C 1 is a diagram showing an outline of the operation in the heating operation mode according to Modification 1. FIG.

[0169] As before, the elements are arranged in the order of the first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b from the air supply inlet 17 toward the air supply outlet 18. The air supply duct 7 is connected to the air supply outlet 18 from the air supply inlet 17 via the first heat exchanger 12, the first condenser 34b, the second heat exchanger 35, and the second condenser 38b. In addition, the exhaust duct 6 is connected to the exhaust outlet 15 from the exhaust inlet 14 via the first heat exchanger 12.

[0170] When the operation mode acquired by the operation mode acquisition unit is the heating operation mode, if the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the control device 20 selects the bypass return air duct 74. On the other hand, when the operation mode acquired by the operation mode acquisition unit is the heating operation mode, if the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the control device 20 selects the heat exchange return air duct 72. The control device 20 sends the selection result to the return air duct switching unit 70.

[0171] The return air duct switching unit 70 switches the heat exchange return air duct 72 and the bypass return air duct 74 based on the selection result received from the control device 20. That is, when the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the return air duct switching unit 70 opens the bypass return air duct 74 and closes the heat exchange return air duct 72. Thus, the bypass return air duct 74 conveys the return air flow 4. On the other hand, when the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the bypass return air duct 74 is closed and the heat exchange return air duct 72 is opened. Thus, the heat exchange return air duct 72 conveys the return air flow 4.

[0172] Thus, the return air duct switching unit 70 switches the heat exchange return air duct 72 and the bypass return air duct 74 based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow 3 acquired by the supply air flow temperature sensor 50 , and the temperature of the indoor air acquired by the indoor temperature sensor 52 .

[0173] The supply air flow 3 sucked from the supply air intake port 17 and the exhaust air flow 2 sucked from the exhaust air intake port 14 are delivered in the same manner as described above, and thus description thereof will be omitted here.

[0174] When the temperature of the supply air flow 3 is lower than the temperature in the room, the return air flow 4 sucked from the return air inlet 60 passes through the heat exchange return air passage 72, thereby performing heat exchange with the supply air flow 3 in the second heat exchanger 35. The return air flow 4 that has performed heat exchange returns to the room from the return air outlet 62. On the other hand, when the temperature of the supply air flow 3 is higher than the temperature in the room, the return air flow 4 sucked from the return air inlet 60 passes through the bypass return air passage 74, thereby not performing heat exchange with the supply air flow 3 in the second heat exchanger 35. The return air flow 4 that has not performed heat exchange returns to the room from the return air outlet 62.

[0175] Figure 6 This is a flowchart showing the operation process of heat exchange ventilator 1 according to Modification 1.

[0176] When the operation of heat exchange ventilator 1 starts ( S50 ), the operation mode acquisition unit acquires the operation mode ( S52 ).

[0177] When the operation mode is the dehumidification operation mode (Yes in S54), the return air flow 4 is delivered by the heat exchange return air duct 72 (S56). On the other hand, when the operation mode is not the dehumidification operation mode (No in S54) but the cooling operation mode (Yes in S58) in step S54, if the temperature of the supply air flow 3 is not higher than the indoor temperature (No in S60), the return air flow 4 is delivered by the bypass return air duct 74 (S62).

[0178] On the other hand, if the temperature of the supply air flow 3 is equal to or higher than the indoor temperature in step S60 (Yes in S60 ), the return air flow 4 is sent by the heat exchange return air duct 72 ( S64 ).

[0179] In addition, when the operation mode is not the cooling operation mode in step S58 (No in S58), if the temperature of the supply air flow 3 is not lower than the indoor temperature (No in S66), the return air flow 4 is delivered by the bypass return air duct 74 (S68). On the other hand, if the temperature of the supply air flow 3 is lower than the indoor temperature in step S66 (Yes in S66), the return air flow 4 is delivered by the heat exchange return air duct 72 (S70).

[0180] (Variant 2)

[0181] Next, a second modification of the embodiment of the present invention will be described. In the second embodiment, the exhaust air duct 6 and the return air duct 8 communicate with each other via a merging air duct 80 .

[0182] Figure 7 It is a diagram showing an outline of the operation of the heat exchange ventilator 1 in the second modification of the embodiment of the present invention.

[0183] Here, the dehumidification operation mode is shown as an example. As before, the elements are arranged in the order of the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35 and the second condenser 38b from the air supply inlet 17 to the air supply outlet 18. The air supply duct 7 is connected to the air supply outlet 18 from the air supply inlet 17 via the first heat exchanger 12, the first evaporator 34a, the second heat exchanger 35 and the second condenser 38b.

[0184] In the return air duct 8, a converging air duct 80 is branched from a branching position 82 after the return air flow 4 passes through the second heat exchanger 35. The converging air duct 80 is connected to the exhaust air duct 6 at a converging position 84. The converging position 84 is a position before the exhaust flow 2 in the exhaust air duct 6 passes through the first heat exchanger 12. That is, the converging air duct 80 connects the exhaust air duct 6 with the return air duct 8, so that the return air flow 4 after passing through the second heat exchanger 35 merges with the exhaust flow 2 before passing through the first heat exchanger 12. When a part of the return air flow 4 cooled in the second heat exchanger 35 is merged with the exhaust flow 2, the temperature of the exhaust flow 2 decreases and the temperature difference between the exhaust flow 2 and the supply air flow 3 in the first heat exchanger 12 becomes larger, so the heat exchange amount increases. As a result, the temperature of the supply air flow 3 flowing into the first evaporator 34a becomes lower, so the dehumidification efficiency is improved.

[0185] It should be noted that the main body of the device, system, or method in the present invention has a computer. The computer executes the program to realize the function of the main body of the device, system, or method in the present invention. The computer has a processor that acts according to the program as the main hardware structure. The processor does not matter what its type is as long as it can realize the function by executing the program. The processor is composed of one or more circuits including a semiconductor integrated circuit (IC) or LSI (Large Scale Integration). Multiple circuits can be integrated into one chip or provided in multiple chips. Multiple chips can also be concentrated in one device or equipped in multiple devices. The program is recorded in a non-temporary recording medium such as a ROM (Read Only Memory), an optical disk, or a hard disk drive that can be read by the computer. The program can be stored in the recording medium in advance, or it can be supplied to the recording medium via a wide area communication network including the Internet.

[0186] As described above, according to this embodiment, heat exchange is performed between the supply air flow 3 and the exhaust air flow 2 in the first heat exchanger 12, and heat exchange is performed between the supply air flow 3 and the return air flow 4 in the second heat exchanger 35, thereby improving the efficiency of the actions of the various operating modes of the heat exchange type ventilation device 1.

[0187] In addition, according to the present embodiment, when the operation mode is the dehumidification operation mode, the return air inlet 60 is set to the open state regardless of the detection results of the supply air flow temperature sensor 50 and the indoor temperature sensor 52, so that heat exchange is performed between the supply air flow 3 and the return air flow 4 in the second heat exchanger 35. In addition, since heat exchange is performed between the supply air flow 3 and the return air flow 4 in the second heat exchanger 35, the return air flow 4 can be dehumidified. In addition, since the return air flow 4 is dehumidified, the dehumidification efficiency can be improved.

[0188] In addition, according to the present embodiment, when the operation mode is the cooling operation mode and the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the return air inlet 60 is set to an open state, so that the supply air flow 3 can be cooled by heat exchange in the second heat exchanger 35. In addition, since the supply air flow 3 is cooled by heat exchange in the second heat exchanger 35, the efficiency of cooling can be improved.

[0189] In addition, according to the present embodiment, when the operation mode is the heating operation mode and the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the return air inlet 60 is set to an open state, so that the supply air flow 3 can be heated by heat exchange in the second heat exchanger 35. In addition, since the supply air flow 3 is heated by heat exchange in the second heat exchanger 35, the heating efficiency can be improved.

[0190] In addition, according to variant example 1 of the present embodiment, when the operation mode is the dehumidification operation mode, regardless of the detection results of the supply air flow temperature sensor 50 and the indoor temperature sensor 52, the heat exchange return air duct 72 transports the return air flow 4, so that heat exchange is performed between the supply air flow 3 and the return air flow 4 in the second heat exchanger 35.

[0191] In addition, according to variant example 1 of the present embodiment, when the operation mode is the cooling operation mode and the temperature of the supply air flow 3 is higher than the temperature of the air in the room, the heat exchange return air duct 72 transports the return air flow 4, thereby being able to cool the supply air flow 3 through heat exchange in the second heat exchanger 35.

[0192] In addition, according to variation example 1 of the present embodiment, when the operation mode is the heating operation mode and the temperature of the supply air flow 3 is lower than the temperature of the air in the room, the heat exchange return air duct 72 transports the return air flow 4, so that the supply air flow 3 can be heated by heat exchange in the second heat exchanger 35.

[0193] In addition, according to the second modification of the present embodiment, the return airflow 4 after passing through the second heat exchanger 35 is merged with the exhaust airflow 2 before passing through the first heat exchanger 12, so that the temperature difference between the supply airflow 3 and the exhaust airflow 2 in the first heat exchanger 12 can be increased. In addition, since the temperature difference between the supply airflow 3 and the exhaust airflow 2 in the first heat exchanger 12 is increased, the heat exchange amount in the first heat exchanger 12 can be increased. In addition, since the heat exchange amount is increased, the efficiency of heat exchange in the heat exchange type ventilator 1 can be improved.

[0194] An outline of one aspect of the present invention is as follows.

[0195] (Item 1)

[0196] A heat exchange type ventilation device (1), wherein:

[0197] The heat exchange type ventilator (1) has a refrigeration cycle (30) and can set a plurality of operation modes.

[0198] The heat exchange type ventilation device (1) comprises:

[0199] an operation mode acquisition unit that acquires a set operation mode among the plurality of operation modes;

[0200] A housing (11) having an air supply inlet (17) for sucking air from outside the room, an air supply outlet (18) for blowing air into the room, an exhaust inlet (14) for sucking air from the room, an exhaust outlet (15) for blowing air out of the room, a return air inlet (60) for sucking air from the room, and a return air outlet (62) for blowing air into the room;

[0201] An air supply passage (7) which connects the air supply inlet (17) with the air supply outlet (18) and conveys the air supply flow (3) sucked from the outside through the shell (11) and blown into the room;

[0202] An exhaust air passage (6) which connects the exhaust air intake port (14) with the exhaust air outlet (15) and conveys an exhaust air flow (2) which is air sucked from the room and passes through the housing (11) and is blown to the outside of the room;

[0203] a return air passage (8) which connects the return air inlet (60) with the return air outlet (62) and conveys a return air flow (4) of air sucked from the room through the housing (11) and then blown out again into the room;

[0204] a first heat exchanger (12) for performing heat exchange between the supply air flow (3) and the exhaust air flow (2);

[0205] a first temperature regulating unit (34) which belongs to the refrigeration cycle (30) and cools or heats the supply air flow (3) after passing through the first heat exchanger (12) based on the operation mode acquired by the operation mode acquisition unit;

[0206] a second heat exchanger (35) for performing heat exchange between the supply air flow (3) and the return air flow (4) after passing through the first temperature adjustment portion (34); and

[0207] The second temperature adjustment unit (38) belongs to the refrigeration cycle (30) and cools or heats the supply air flow (3) after passing through the second heat exchanger (35) based on the operation mode acquired by the operation mode acquisition unit.

[0208] (Item 2)

[0209] The heat exchange type ventilator (1) according to item 1, wherein:

[0210] The heat exchange type ventilation device (1) further comprises:

[0211] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35);

[0212] an indoor temperature sensor (52) for detecting the temperature of the air in the room; and

[0213] a return air intake switching unit (64) for switching the opening and closing of the return air intake port (60) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0214] When the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, the return air intake switching unit (64) sets the return air intake port (60) to an open state regardless of the detection results of the supply air flow temperature sensor (50) and the indoor temperature sensor (52).

[0215] (Item 3)

[0216] The heat exchange type ventilator (1) according to item 1, wherein:

[0217] The heat exchange type ventilation device (1) further comprises:

[0218] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35);

[0219] an indoor temperature sensor (52) for detecting the temperature of the air in the room; and

[0220] a return air intake switching unit (64) for switching the opening and closing of the return air intake port (60) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0221] The return air intake switching unit (64) sets the return air intake port (60) to an open state when the operation mode acquired by the operation mode acquisition unit is a cooling mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is higher than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0222] The return air intake switching unit (64) sets the return air intake port (60) to a closed state when the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0223] (Item 4)

[0224] The heat exchange type ventilator (1) according to item 1, wherein:

[0225] The heat exchange type ventilation device (1) further comprises:

[0226] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35);

[0227] an indoor temperature sensor (52) for detecting the temperature of the air in the room; and

[0228] a return air intake switching unit (64) for switching the opening and closing of the return air intake port (60) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0229] The return air intake switching unit (64) sets the return air intake port (60) to a closed state when the operation mode acquired by the operation mode acquisition unit is a heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is higher than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0230] The return air intake switching unit (64) sets the return air intake port (60) to an open state when the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0231] (Item 5)

[0232] The heat exchange type ventilator (1) according to item 1, wherein:

[0233] The heat exchange type ventilation device (1) further comprises:

[0234] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35); and

[0235] an indoor temperature sensor (52) for detecting the temperature of the air in the room,

[0236] The return air duct (8) comprises:

[0237] a heat exchange return air path (72) for allowing the return air flow (4) to pass through the second heat exchanger (35);

[0238] a bypass return air passage (74) that enables the return air flow (4) to bypass the second heat exchanger (35); and

[0239] a return air duct switching unit (70) for switching between the heat exchange return air duct (72) and the bypass return air duct (74) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0240] When the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, the return air duct switching unit (70) causes the heat exchange return air duct (72) to transport the return air flow (4) regardless of the detection results of the supply air flow temperature sensor (50) and the indoor temperature sensor (52).

[0241] (Item 6)

[0242] The heat exchange type ventilator (1) according to item 1, wherein:

[0243] The heat exchange type ventilation device (1) further comprises:

[0244] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35); and

[0245] an indoor temperature sensor (52) for detecting the temperature of the air in the room,

[0246] The return air duct (8) comprises:

[0247] a heat exchange return air path (72) for allowing the return air flow (4) to pass through the second heat exchanger (35);

[0248] a bypass return air passage (74) that enables the return air flow (4) to bypass the second heat exchanger (35); and

[0249] a return air duct switching unit (70) for switching between the heat exchange return air duct (72) and the bypass return air duct (74) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0250] The return air duct switching unit (70) causes the heat exchange return air duct (72) to convey the return air duct (4) when the operation mode acquired by the operation mode acquisition unit is a cooling mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is greater than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0251] The return air duct switching unit (70) causes the bypass return air duct (74) to transport the return air flow (4) when the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0252] (Item 7)

[0253] The heat exchange type ventilator (1) according to item 1, wherein:

[0254] The heat exchange type ventilation device (1) further comprises:

[0255] a supply air flow temperature sensor (50) for detecting the temperature of the supply air flow (3) after passing through the first temperature adjustment portion (34) and before passing through the second heat exchanger (35); and

[0256] an indoor temperature sensor (52) for detecting the temperature of the air in the room,

[0257] The return air duct (8) comprises:

[0258] a heat exchange return air path (72) for allowing the return air flow (4) to pass through the second heat exchanger (35);

[0259] a bypass return air passage (74) that enables the return air flow (4) to bypass the second heat exchanger (35); and

[0260] a return air duct switching unit (70) for switching between the heat exchange return air duct (72) and the bypass return air duct (74) based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50), and the temperature of the indoor air acquired by the indoor temperature sensor (52);

[0261] The return air duct switching unit (70) causes the bypass return air duct (74) to convey the return air flow (4) when the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is higher than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0262] The return air duct switching unit (70) causes the heat exchange return air duct (72) to transport the return air flow (4) when the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow (3) acquired by the supply air flow temperature sensor (50) is lower than the temperature of the indoor air acquired by the indoor temperature sensor (52).

[0263] (Item 8)

[0264] The heat exchange type ventilator (1) according to item 1, wherein:

[0265] The heat exchange type ventilation device (1) further comprises a merging air passage (80) which connects the exhaust air passage (6) with the return air passage (8), thereby merging the return air flow (4) after passing through the second heat exchanger (35) with the exhaust air flow (2) before passing through the first heat exchanger (12).

[0266] As mentioned above, although the present invention has been described based on the embodiment and the modified example, the present invention is not limited to the above-mentioned embodiment and the modified example at all, and it can be easily estimated that various improvements and modifications can be made within the scope not departing from the gist of the present invention.

Claims

1. A heat exchange type ventilation device, wherein: The heat exchange type ventilator has a refrigeration cycle and can be set to a plurality of operation modes. The heat exchange type ventilation device comprises: an operation mode acquisition unit that acquires a set operation mode among the plurality of operation modes; A housing having an air supply inlet for sucking air from outside the room, an air supply outlet for blowing air into the room, an exhaust inlet for sucking air from the room, an exhaust outlet for blowing air out of the room, a return air inlet for sucking air from the room, and a return air outlet for blowing air into the room; an air supply duct, which connects the air supply inlet with the air supply outlet and conveys the air supply flow sucked from the outside through the shell and blown into the room; an exhaust air passage, which connects the exhaust inlet with the exhaust outlet and conveys an exhaust flow of air sucked from the room through the housing and blown to the outside of the room; a return air duct, which connects the return air inlet with the return air outlet and conveys a return airflow that is air inhaled from the room and passes through the housing and is blown out again into the room; a first heat exchanger that performs heat exchange between the supply air flow and the exhaust air flow; a first temperature adjustment unit, which belongs to the refrigeration cycle and cools or heats the supply air flow after passing through the first heat exchanger based on the operation mode acquired by the operation mode acquisition unit; a second heat exchanger for performing heat exchange between the supply air flow and the return air flow after passing through the first temperature adjustment part; as well as The second temperature adjustment unit belongs to the refrigeration cycle and cools or heats the supply air flow after passing through the second heat exchanger based on the operation mode acquired by the operation mode acquisition unit.

2. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment part and before passing through the second heat exchanger; An indoor temperature sensor, which detects the temperature of the air in the room; as well as a return air intake switching unit for switching the opening and closing of the return air intake port based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, When the operation mode acquired by the operation mode acquisition unit is a dehumidification mode, the return air intake switch sets the return air intake port to an open state regardless of detection results of the supply air flow temperature sensor and the indoor temperature sensor.

3. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment part and before passing through the second heat exchanger; An indoor temperature sensor, which detects the temperature of the air in the room; as well as a return air intake switching unit for switching the opening and closing of the return air intake port based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, The return air intake switch sets the return air intake port to an open state when the operation mode acquired by the operation mode acquisition unit is a cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is higher than the temperature of the indoor air acquired by the indoor temperature sensor. The return air intake switcher sets the return air intake port to a closed state when the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the indoor air acquired by the indoor temperature sensor.

4. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment part and before passing through the second heat exchanger; An indoor temperature sensor, which detects the temperature of the air in the room; as well as a return air intake switching unit for switching the opening and closing of the return air intake port based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, The return air intake switching unit sets the return air intake port to a closed state when the operation mode acquired by the operation mode acquisition unit is a heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is equal to or higher than the temperature of the indoor air acquired by the indoor temperature sensor. The return air intake switch opens the return air intake port when the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the indoor air acquired by the indoor temperature sensor.

5. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment portion and before passing through the second heat exchanger; and an indoor temperature sensor, which detects the temperature of the air in the room, The return air duct has: a heat exchange return air passage, which allows the return air flow to pass through the second heat exchanger; A bypass return air passage, which enables the return air flow to bypass the second heat exchanger; and a return air duct switching unit for switching the heat exchange return air duct and the bypass return air duct based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, When the operation mode acquired by the operation mode acquisition unit is the dehumidification mode, the return air duct switching unit causes the heat exchange return air duct to convey the return air flow regardless of detection results of the supply air flow temperature sensor and the indoor temperature sensor.

6. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment portion and before passing through the second heat exchanger; and an indoor temperature sensor, which detects the temperature of the air in the room, The return air duct has: a heat exchange return air passage, which allows the return air flow to pass through the second heat exchanger; A bypass return air passage, which enables the return air flow to bypass the second heat exchanger; and a return air duct switching unit for switching the heat exchange return air duct and the bypass return air duct based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, The return air duct switching unit causes the heat exchange return air duct to convey the return air flow when the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is greater than the temperature of the indoor air acquired by the indoor temperature sensor. The return air duct switching unit causes the bypass return air duct to convey the return air flow when the operation mode acquired by the operation mode acquisition unit is the cooling mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the indoor air acquired by the indoor temperature sensor.

7. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilation device further comprises: a supply air flow temperature sensor for detecting a temperature of the supply air flow after passing through the first temperature adjustment portion and before passing through the second heat exchanger; and an indoor temperature sensor, which detects the temperature of the air in the room, The return air duct has: a heat exchange return air passage, which allows the return air flow to pass through the second heat exchanger; A bypass return air passage, which enables the return air flow to bypass the second heat exchanger; and a return air duct switching unit for switching the heat exchange return air duct and the bypass return air duct based on the operation mode acquired by the operation mode acquisition unit, the temperature of the supply air flow acquired by the supply air flow temperature sensor, and the temperature of the indoor air acquired by the indoor temperature sensor, The return air duct switching unit causes the bypass return air duct to convey the return air flow when the operation mode acquired by the operation mode acquisition unit is a heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is greater than the temperature of the indoor air acquired by the indoor temperature sensor. The return air duct switching unit causes the heat exchange return air duct to convey the return air flow when the operation mode acquired by the operation mode acquisition unit is the heating mode and the temperature of the supply air flow acquired by the supply air flow temperature sensor is lower than the temperature of the indoor air acquired by the indoor temperature sensor.

8. The heat exchange type ventilator according to claim 1, wherein: The heat exchange type ventilator further includes a merging air passage that connects the exhaust air passage and the return air passage so as to merge the return air flow after passing through the second heat exchanger with the exhaust air flow before passing through the first heat exchanger.

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