Fresh air machine

Abstract

The utility model discloses a fresh air ventilator, and belongs to the technical field of air treatment. The fresh air machine comprises an air duct, a total heat exchange core body and a refrigerating system. The total heat exchange core body is provided with a first channel and a second channel, the first channel communicates with the fresh air channel, and the second channel communicates with the exhaust air channel; the refrigerating system comprises a first fresh air side heat exchanger which is arranged in the fresh air duct and located on the windward side of the total heat exchange core body; the air exhaust side heat exchanger is arranged in the air exhaust duct and located on the air outlet side of the total heat exchange core body; during refrigeration, the first fresh air side heat exchanger is used as an evaporator, the exhaust side heat exchanger is used as a condenser, and the fresh air ventilator enables outdoor air to flow to the total heat exchange core body after being cooled by the evaporator; during heating, the first fresh air side heat exchanger is used as a condenser, the exhaust side heat exchanger is used as an evaporator, and the fresh air ventilator enables outdoor air to flow to the total heat exchange core body after being heated by the condenser. According to the fresh air machine, the risks of condensation and ice blockage in the total heat exchange core body can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the technical field of air treatment, and in particular to a new air blower. Background Art

[0002] A fresh air fan is a device that can bring outdoor air into the room and exhaust indoor air to the outside. Most fresh air fans use a full heat exchange core to recover the heat of the indoor air.

[0003] When there is a large temperature difference between indoor and outdoor, condensation is likely to occur at the heat exchange core; or, in extreme low temperature conditions, ice blockage is likely to occur at the heat exchange core. Some products use optional electric heating to solve this problem, but optional electric heating may pose a fire hazard when installed indoors. Utility Model Content

[0004] The present application provides a new air fan that can effectively avoid the risks of condensation and ice blockage inside the full heat exchange core.

[0005] In one aspect of the present application, a fresh air blower comprises: an air duct, a full heat exchange core and a refrigeration system; the air duct comprises a fresh air duct and an exhaust air duct; the full heat exchange core comprises a first channel and a second channel, the first channel is connected to the fresh air duct, and the second channel is connected to the exhaust air duct;

[0006] The refrigeration system comprises: a first fresh air side heat exchanger, which is arranged in the fresh air duct and located on the windward side of the full heat exchange core; an exhaust air side heat exchanger, which is arranged in the exhaust air duct and located on the air outlet side of the full heat exchange core;

[0007] During cooling, the first fresh air side heat exchanger is used as an evaporator, and the exhaust air side heat exchanger is used as a condenser; the fresh air fan can make the outdoor air flow to the full heat exchange core after being cooled by the evaporator; during heating, the first fresh air side heat exchanger is used as a condenser, and the exhaust air side heat exchanger is used as an evaporator; the fresh air fan can make the outdoor air flow to the full heat exchange core after being heated by the condenser.

[0008] On the other hand of the present application, a fresh air fan includes a refrigeration system, which includes: a first fresh air side heat exchanger, a second fresh air side heat exchanger and a third fresh air side heat exchanger, which are arranged in the fresh air duct in sequence according to the flow direction of outdoor air, the first fresh air side heat exchanger is located on the windward side of the full heat exchange core, and the second fresh air side heat exchanger and the third fresh air side heat exchanger are located on the outlet side of the full heat exchange core.

[0009] In some embodiments, the refrigeration system also includes: a compressor for compressing the refrigerant; a first four-way valve for selectively guiding the refrigerant compressed by the compressor to the first fresh air side heat exchanger or the third fresh air side heat exchanger; a second four-way valve for selectively guiding the refrigerant compressed by the compressor to the second fresh air side heat exchanger or the exhaust air side heat exchanger; a first throttle valve connected in series between the first fresh air side heat exchanger and the third fresh air side heat exchanger; a second throttle valve connected in series between the second fresh air side heat exchanger and the exhaust air side heat exchanger; a first branch, a first end of which is connected between the first four-way valve and the third fresh air side heat exchanger, a second end of the first branch is connected between the second four-way valve and the exhaust air side heat exchanger, and a first on-off valve is connected in series on the first branch; a second branch, a first end of which is connected between the third fresh air side heat exchanger and the first end of the first branch, a second end of the second branch is connected between the second throttle valve and the second fresh air side heat exchanger, and the third throttle valve is connected in series on the second branch; a second on-off valve is connected in series between the first end of the first branch and the first end of the second branch.

[0010] In some embodiments, the refrigeration system also includes: a compressor for compressing the refrigerant; a first four-way valve for selectively guiding the refrigerant compressed by the compressor to the second fresh air side heat exchanger or the third fresh air side heat exchanger; a second four-way valve for selectively guiding the refrigerant compressed by the compressor to the first fresh air side heat exchanger or the exhaust air side heat exchanger; a first throttle valve connected in series between the second fresh air side heat exchanger and the third fresh air side heat exchanger; a second throttle valve connected in series between the first fresh air side heat exchanger and the exhaust air side heat exchanger; a first branch, a first end of which is connected between the first four-way valve and the third fresh air side heat exchanger, a second end of the first branch is connected between the second four-way valve and the exhaust air side heat exchanger, and a first on-off valve is connected in series on the first branch; a second branch, a first end of which is connected between the third fresh air side heat exchanger and the first end of the first branch, a second end of the second branch is connected between the second throttle valve and the first fresh air side heat exchanger, and a third throttle valve is connected in series on the second branch; a second on-off valve is connected in series between the first end of the first branch and the first end of the second branch.

[0011] In some embodiments, the first on-off valve and the second on-off valve are replaced by a three-way valve, a first end of the three-way valve is connected to the first four-way valve, a second end of the three-way valve is connected to the first end of the second branch, and a third end of the three-way valve is connected to the first end of the first branch.

[0012] In some embodiments, the compressor has a first suction port, a second suction port, a first exhaust port, and a second exhaust port; the first suction port and the first exhaust port are respectively connected to a first four-way valve; the second suction port and the second exhaust port are respectively connected to a second four-way valve.

[0013] In some embodiments, a third on-off valve is connected in series to the second branch to control the on-off of the second branch.

[0014] In some embodiments, the second on-off valve and the third on-off valve can be replaced by a three-way valve, the first end of the three-way valve is connected to the third fresh air side heat exchanger, the second end of the three-way valve is connected to the first end of the first branch, and the third end of the three-way valve is connected to the first end of the second branch.

[0015] In some embodiments, during dehumidification operation, the first branch and the second branch are disconnected, and the third fresh air side heat exchanger is used as a condenser;

[0016] During cooling or heating operation, the first branch is connected to the second branch, the second on-off valve is disconnected, and the third fresh air side heat exchanger is used as an evaporator during cooling and as a condenser during heating.

[0017] In some embodiments, a shell is included; a refrigeration system is disposed in the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 shows a schematic diagram of a new air blower according to some embodiments;

[0019] Figure 2 shows a schematic diagram of a fresh air blower according to some other embodiments;

[0020] Figure 3 A refrigerant circuit diagram of a fresh air blower in cooling mode according to some other embodiments is shown;

[0021] Figure 4 shows a refrigerant circuit diagram of a fresh air fan in a heating mode according to other embodiments;

[0022] Figure 5 A refrigerant circuit diagram of a fresh air fan in a dehumidification mode according to some other embodiments is shown;

[0023] Figure 6 The refrigerant circuit of the fresh air blower according to some other embodiments is shown. Figure 1 ;

[0024] Figure 7 The refrigerant circuit of the fresh air blower according to some other embodiments is shown. Figure 2 ;

[0025] Figure 8 The refrigerant circuit of the fresh air blower according to some other embodiments is shown. Figure 3 ;

[0026] In the above figures, 10, shell; 20, full heat exchange core; 31, exhaust fan; 32, supply fan; 41, first fresh air side heat exchanger; 42, second fresh air side heat exchanger; 43, third fresh air side heat exchanger; 44, exhaust side heat exchanger; 45, compressor; 46, four-way valve; 461, first four-way valve; 462, second four-way valve; 47, throttle valve; 471, first throttle valve; 472, second throttle valve; 473, third throttle valve; 481, first branch; 482, second branch; 491, first on-off valve; 492, second on-off valve; 493, third on-off valve; 494, three-way valve. DETAILED DESCRIPTION

[0027] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0028] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The implementation scheme of the new air fan of the present application is described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1In the figure, the solid arrows indicate the flow path of outdoor air, and the dashed arrows indicate the flow path of indoor air. The fresh air fan according to the embodiment of the present application includes a shell 10.

[0033] The housing 10 forms the general appearance of the fresh air machine, and is roughly in the shape of a rectangular parallelepiped, and can be formed by welding or screwing a plurality of sheet metals. The housing 10 is provided with a fresh air inlet OA, an air supply inlet SA, a return air inlet RA, and an air exhaust inlet EA.

[0034] A fresh air duct and an exhaust air duct are formed in the shell 10. The fresh air duct connects the fresh air outlet OA and the air supply outlet SA for circulating outdoor air; the exhaust air duct connects the return air outlet RA and the exhaust air outlet EA for circulating indoor air.

[0035] The fresh air blower comprises a full heat exchange core 20. The full heat exchange core 20 is arranged in the housing 10 and is used to realize heat exchange between indoor air and outdoor air.

[0036] The fresh air duct and the exhaust air duct are respectively communicated with the total heat exchange core 20. Specifically, the total heat exchange core 20 has a first channel and a second channel, the first channel is communicated with the fresh air duct, and the second channel is communicated with the exhaust air duct.

[0037] The fresh air fan includes a supply fan 32 and an exhaust fan 31. The supply fan 32 is arranged in the fresh air duct corresponding to the supply air outlet SA to force outdoor air to flow; the exhaust fan 31 is arranged in the exhaust air duct corresponding to the exhaust air outlet EA to force indoor air to flow.

[0038] When the fresh air fan 130 is working, under the action of the supply fan 32 and the exhaust fan 31, the indoor air from the return air outlet RA flows through the full heat exchange core 20 in the exhaust air duct, and the outdoor fresh air from the fresh air outlet OA flows through the full heat exchange core 20 in the fresh air duct. The two air streams exchange heat at the full heat exchange core 20, and the indoor air after heat exchange is blown to the exhaust outlet EA, and the outdoor air after heat exchange is blown to the supply air outlet SA.

[0039] For example, when the fresh air fan is running in the summer cooling period, the outdoor fresh air obtains coldness from the indoor air, causing the temperature to drop; when the fresh air fan is running in the winter heating period, the outdoor fresh air obtains heat from the indoor air, causing the temperature to rise.

[0040] In some application scenarios of the fresh air fan, the supply air outlet SA and the return air outlet RA are connected to the indoor through air ducts, and the exhaust air outlet EA and the fresh air outlet OA are connected to the outdoors through air ducts.

[0041] When the temperature difference between indoor and outdoor is large, for example, in the cooling period in summer, the indoor air temperature is relatively low during air conditioning, while the outdoor temperature is relatively high. When the indoor and outdoor air with a large temperature difference pass through the full heat exchange core 20, a large amount of condensation will be generated inside the core; or, in extremely low temperature weather, the full heat exchange core 20 is prone to ice blockage.

[0042] In order to solve the above problems, the present application applies the refrigeration system of the air conditioner to the fresh air fan, and realizes cooling or heating of the outdoor air through the refrigeration system.

[0043] In the embodiment provided in the present application, the fresh air machine includes a refrigeration system. The refrigeration system includes a first fresh air side heat exchanger 41, which is arranged in the fresh air duct and located on the windward side of the total heat exchange core 20, and is used to reduce the temperature of the indoor air during cooling and increase the temperature of the outdoor air during heating.

[0044] The refrigeration system includes an exhaust side heat exchanger 44 , which is arranged in the exhaust air duct and located on the air outlet side of the total heat exchange core 20 .

[0045] During cooling, the first fresh air side heat exchanger 41 is used as an evaporator to reduce the temperature of the outdoor air; the exhaust air side heat exchanger 44 is used as a condenser. During heating, the first fresh air side heat exchanger 41 is used as a condenser to increase the temperature of the outdoor air; the exhaust air side heat exchanger 44 is used as an evaporator.

[0046] In the implementation manner provided in the present application, a first fresh air side heat exchanger 41 is arranged between the fresh air inlet OA and the full heat exchange core 20, and the first fresh air side heat exchanger 41 performs a heat exchange on the introduced outdoor air to reduce the temperature difference between the outdoor air and the indoor air. Then the outdoor air flows into the full heat exchange core 20 again, which effectively solves the problem of a large amount of condensation inside the core when the temperature difference between the indoor air and the outdoor air is too large, and avoids the phenomenon of water blowing out of the core outlet.

[0047] In the implementation manner provided in the present application, a first fresh air side heat exchanger 41 is arranged between the fresh air inlet OA and the full heat exchange core 20. In extremely low temperature weather, the supercooled outdoor air is first preheated by the first fresh air side heat exchanger 41, and then flows into the full heat exchange core 20, thereby effectively avoiding the problem of ice blockage of the full heat exchange core 20 causing a large attenuation of the air volume and damage to the full heat exchange core 20.

[0048] The refrigeration system includes a compressor 45 for sucking and compressing the refrigerant to make it a high-temperature and high-pressure state; a four-way valve 46 for switching the refrigerant flow path in the cooling mode and the refrigerant flow path in the heating mode; and a throttle valve 47 for reducing the refrigerant.

[0049] In the refrigeration system, the exhaust end of the compressor 45 is connected to the d pipe of the four-way valve 46, the c pipe and the e pipe of the four-way valve 46 are respectively connected to the exhaust side heat exchanger 44 and the first fresh air side heat exchanger 41, and the s pipe of the four-way valve 46 is connected to the suction end of the compressor 45. The exhaust side heat exchanger 44, the throttle valve 47 and the first fresh air side heat exchanger 41 are connected in series in sequence.

[0050] The four-way valve 46 guides the refrigerant compressed by the compressor 45 to the exhaust-air side heat exchanger 44 in the cooling mode, and guides the refrigerant compressed by the compressor 45 to the first fresh air side heat exchanger 41 in the heating mode.

[0051] The following introduces the working mode of the fresh air fan in combination with the refrigeration system:

[0052] Refrigeration mode: The compressor 45 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow to the exhaust side heat exchanger 44 through the four-way valve 46. The exhaust side heat exchanger 44 condenses the refrigerant into liquid. The liquid refrigerant passes through the throttle valve 47. After the throttle valve 47 reduces the pressure and temperature of the liquid refrigerant, the first fresh air side heat exchanger 41 evaporates the reduced pressure and temperature liquid refrigerant into gas. The gaseous refrigerant returns to the compressor 45 via the four-way valve 46.

[0053] In the above cooling mode, the first fresh air side heat exchanger 41 acts as an evaporator, and the refrigerant therein exchanges heat with the indoor air, so that the indoor air is cooled.

[0054] Heating mode: The compressor 45 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow to the first fresh air side heat exchanger 41 through the four-way valve 46. The first fresh air side heat exchanger 41 condenses the refrigerant into a liquid state and then flows to the throttle valve 47. The throttle valve 47 reduces the pressure and temperature of the liquid refrigerant, and the exhaust side heat exchanger 44 evaporates the reduced pressure and temperature liquid refrigerant into a gaseous state. The gaseous refrigerant returns to the compressor 45 through the four-way valve 46.

[0055] In the above heating mode, the first fresh air side heat exchanger 41 acts as a condenser, and the refrigerant therein exchanges heat with the indoor air, so that the indoor air is heated.

[0056] In some embodiments, the compressor 45, the four-way valve 46, the throttle valve 47, etc. in the refrigeration system are all located in the housing 10, that is, the refrigeration system is located in the housing 10, and the fresh air blower has no outdoor unit, which reduces the overall cost of the unit. When the indoor cooling and heating loads are low, the refrigeration system can be turned off and only ventilation can be turned on to save energy.

[0057] In other embodiments, the compressor 45, four-way valve 46, throttle valve 47, etc. in the refrigeration system can be arranged in the outdoor unit. In this case, the exhaust side heat exchanger 44 is not in the outdoor unit but in the shell 10, which can reduce the volume of the outdoor unit.

[0058] In some embodiments, reference Figures 2 to 5 The refrigeration system includes a second fresh air side heat exchanger 42, which is arranged in the fresh air duct and located on the air outlet side of the total heat exchange core 20. The second fresh air side heat exchanger 42 can adjust the temperature of the outdoor air so that the outdoor air is sent into the room at a suitable temperature. Specifically, the second fresh air side heat exchanger 42 is used as an evaporator in cooling and can continue to reduce the temperature of the outdoor air; it is used as a condenser in heating and can continue to heat the temperature of the outdoor air.

[0059] The refrigeration system includes a third fresh air heat exchanger 43, which is arranged in the fresh air duct and located at the outlet side of the second fresh air side heat exchanger 42. The third fresh air side heat exchanger 43 can adjust the temperature of the outdoor air so that the outdoor air is delivered into the room at a suitable temperature.

[0060] Specifically, the third fresh air side heat exchanger 43 is used as an evaporator in cooling to continue to reduce the temperature of the outdoor air; and is used as a condenser in heating to continue to heat the temperature of the outdoor air. In addition, the third fresh air side heat exchanger 43 can also be used as a condenser in dehumidification to heat the temperature of the outdoor air to prevent the temperature of the outdoor air from being too low.

[0061] In some embodiments, the refrigeration system includes a first four-way valve 461 , a second four-way valve 462 , a first throttle valve 471 , and a second throttle valve 472 .

[0062] The d pipe of the first four-way valve 461 is connected to the exhaust end of the compressor 45, and the s pipe of the first four-way valve 461 is connected to the suction end of the compressor 45. The e pipe and the c pipe of the first four-way valve 461 are connected to the first end of the first fresh air side heat exchanger 41 and the first end of the third fresh air side heat exchanger 43, respectively.

[0063] The second end of the first fresh air side heat exchanger 41 and the second end of the third fresh air side heat exchanger 43 are connected in series via a first throttle valve 471 .

[0064] A refrigerant circuit is formed between the compressor 45 , the first four-way valve 461 , the first fresh air side heat exchanger 41 , the first throttle valve 471 , and the third fresh air side heat exchanger 43 .

[0065] The d pipe of the second four-way valve 462 is connected to the exhaust end of the compressor 45, and the s pipe of the second four-way valve 462 is connected to the suction end of the compressor 45. The e pipe and the c pipe of the second four-way valve 462 are connected to the first end of the second fresh air side heat exchanger 42 and the first end of the exhaust air side heat exchanger 44, respectively.

[0066] The second end of the second fresh air side heat exchanger 42 and the second end of the exhaust air side heat exchanger 44 are connected in series via a second throttle valve 472 .

[0067] A refrigerant circuit is formed between the compressor 45 , the second four-way valve 462 , the second fresh air side heat exchanger 42 , the first throttle valve 471 , and the exhaust air side heat exchanger 44 .

[0068] The refrigeration system includes a first branch 481. The first end of the first branch 481 is connected between the c tube of the first four-way valve 461 and the third fresh air side heat exchanger 43, and the second end of the first branch 481 is connected between the c tube of the second four-way valve 462 and the exhaust air side heat exchanger 44.

[0069] The refrigeration system further includes a first on-off valve 491 for controlling the on-off of the first branch 481. Exemplarily, the first on-off valve 491 may be a solenoid valve or a stop valve connected in series to the first branch 481. When the first on-off valve 491 is opened, the first branch 481 is connected, and when the first on-off valve 491 is closed, the first branch 481 is disconnected.

[0070] The refrigeration system includes a second branch 482 . A first end of the second branch 482 is connected between a first end of the first branch 481 and the third fresh air side heat exchanger 43 , and a second end of the second branch 482 is connected between the second throttle valve 472 and the second fresh air side heat exchanger 42 .

[0071] The third throttle valve 473 is connected in series to the second branch 482 for reducing the pressure of the refrigerant on the second branch 482 or for controlling the on-off of the second branch 482 .

[0072] The refrigeration system includes a second on-off valve 492 connected in series between a first end of the first branch 481 and a first end of the second branch 482 .

[0073] In the cooling mode, the first on-off valve 491 is opened, the second on-off valve 492 is closed, the second throttle valve 472 mainly plays a throttling role, the first throttle valve 471 and the third throttle valve 473 are fully opened or auxiliary throttling, so that the first fresh air side heat exchanger 41, the second fresh air side heat exchanger 42, and the third fresh air side heat exchanger 43 are used as evaporators, and the exhaust air side heat exchanger 44 is used as a condenser.

[0074] In the heating mode, the first on-off valve 491 is opened, the second on-off valve 492 is closed, the second throttle valve 472 mainly plays a throttling role, the third throttle valve 473 assists in throttling or is fully open, and the first throttle valve 471 is fully open, so that the first fresh air side heat exchanger 41, the second fresh air side heat exchanger 42, and the third fresh air side heat exchanger 43 are used as condensers, and the exhaust air side heat exchanger 44 is used as an evaporator.

[0075] In the dehumidification mode, the first on-off valve 491 is disconnected, the second on-off valve 492 is opened, and the third throttle valve 473 is completely closed. The first throttle valve 471 and the second throttle valve 472 play a throttling role, so that the first fresh air side heat exchanger 41 and the second fresh air side heat exchanger 42 are used as evaporators, the third fresh air side heat exchanger 43 is used as a condenser, and the exhaust air side heat exchanger 44 is used as a condenser.

[0076] In some embodiments, the compressor 45 may adopt a double-inlet and double-outlet structure, that is, the compressor 45 includes a first air intake port, a first air exhaust port, a second air intake port, and a second air exhaust port.

[0077] The first four-way valve 461 connects the first air intake port and the first air discharge port of the compressor 45 ; the second four-way valve 462 connects the second air intake port and the second air discharge port of the compressor 45 .

[0078] In some embodiments, a third on-off valve 493 may be connected in series to the second branch 482 to control the on-off of the second branch 482 , thereby avoiding the problem of frequent starting and stopping of the third throttle valve 473 when used to control the on-off of the second branch 482 .

[0079] <Cooling Mode>

[0080] Reference Figure 3 , the arrows in the figure indicate the flow direction of the refrigerant. The high-temperature and high-pressure refrigerant ejected from the first exhaust port of the compressor 45 passes through the first four-way valve 461, flows through the first on-off valve 491 (opened), and then mixes with the refrigerant ejected from the second exhaust port to the second four-way valve 462, and flows through the exhaust side heat exchanger 44 (used as a condenser) to release heat. After the refrigerant flowing out of the exhaust side heat exchanger 44 is throttled by the second throttle valve 472, a part of it flows through the second fresh air side heat exchanger 42 (used as an evaporator) to absorb heat, and then returns to the second air intake port of the compressor 45 through the second four-way valve 462 to complete the cycle; a part of it passes through the third throttle valve 473, flows through the third fresh air side heat exchanger 43 (used as an evaporator) and the first fresh air side heat exchanger 41 (used as an evaporator) to absorb heat, and then returns to the first air intake port of the compressor 45 through the first four-way valve 461 to complete the cycle.

[0081] In this process, the second throttle valve 472 mainly plays a throttling role, and the first throttle valve 471 and the third throttle valve 473 assist in throttling or are fully open.

[0082] Duct system: Outdoor air is introduced into the fresh air duct through the air supply fan 32, and after being cooled by the first fresh air side heat exchanger 41, it exchanges heat with the indoor air introduced into the total heat exchange core 20 through the exhaust fan 31. The outdoor air coming out of the total heat exchange core 20 continues to be cooled by the second fresh air side heat exchanger 42 and the third fresh air side heat exchanger 43, and then is sent to the room.

[0083] The indoor air coming out of the full heat exchange core 20 is still lower than the outdoor temperature, and can take away more heat through the exhaust side heat exchanger 44 and discharge it to the outdoors, thereby reducing the heat load of the air conditioning system again.

[0084] <Heating Mode>

[0085] Reference Figure 4 , the arrows in the figure indicate the flow direction of the refrigerant. The high-temperature and high-pressure refrigerant compressed by the compressor 45 is ejected from the first exhaust port and flows through the first four-way valve 461 through the first fresh air side heat exchanger 41 (used as a condenser), the first throttle valve 471 (fully open, no throttling), and the third fresh air side heat exchanger 43 (used as a condenser) to release heat, and then flows to the third throttle valve 473; the refrigerant ejected from the second exhaust port passes through the second four-way valve 462, flows through the second fresh air side heat exchanger 42 (used as a condenser) to release heat, and then mixes with the refrigerant from the third throttle valve 473. The mixed refrigerant continues to be throttled by the second throttle valve 472, flows through the exhaust side heat exchanger 43 to absorb heat, and then is divided into two paths, one path passes through the first on-off valve 491 and the first four-way valve 461 to return to the first suction port of the compressor 45 to complete the cycle; the other path passes through the second four-way valve 462 to return to the second suction port of the compressor 45 to complete the cycle.

[0086] During this process, the second throttle valve 472 mainly plays a throttling role, the third throttle valve 473 assists in throttling or is fully opened, and the first throttle valve 471 is fully opened.

[0087] Duct system: Outdoor air is introduced into the fresh air duct through the air supply fan 32, and after being heated by the first fresh air side heat exchanger 41, it exchanges heat with the indoor air introduced into the total heat exchange core 20 through the exhaust fan 31. The outdoor air coming out of the total heat exchange core 20 continues to be heated by the second fresh air side heat exchanger 42 and the third fresh air side heat exchanger 43 before being sent to the room.

[0088] The indoor air coming out of the full heat exchange core 20 is still higher in temperature than the outdoor temperature, and can be discharged to the outdoors after exchanging heat through the exhaust side heat exchanger 44, thereby further reducing the heat load of the air conditioning system.

[0089] <Dehumidification Mode>

[0090] Reference Figure 5 , the arrows in the figure indicate the flow direction of the refrigerant. After a part of the high-temperature and high-pressure refrigerant compressed by the compressor 45 is ejected from the first exhaust port, it passes through the first four-way valve 461 and flows through the third fresh air side heat exchanger 43 (used as a condenser) to release heat, then passes through the first throttle valve 471 to throttle and flows through the first fresh air side heat exchanger 41 (used as an evaporator) to absorb heat, and then continues to pass through the first four-way valve 461 to return to the first air intake port of the compressor 45 to complete the cycle;

[0091] After the other part of the high-temperature and high-pressure refrigerant compressed by the compressor 45 is ejected from the second exhaust port, it passes through the exhaust side heat exchanger 44 (used as a condenser) through the second four-way valve 462 to release heat, and then after throttling by the second throttle valve 472, it flows through the second fresh air side heat exchanger 42 (used as an evaporator) to absorb heat, and then returns to the second intake port of the compressor 45 through the second four-way valve 462 to complete the cycle.

[0092] Duct system: Outdoor air is introduced into the fresh air duct through the air supply fan 32, and after being cooled and dehumidified by the first fresh air side heat exchanger 41, it exchanges heat with the indoor air introduced into the full heat exchange core 20 through the exhaust fan 31. The outdoor air coming out of the full heat exchange core 20 continues to be further dehumidified by the second fresh air side heat exchanger 42, and then is reheated by the third fresh air side heat exchanger 43 and sent to the room, thereby achieving the effect of dehumidification without cooling.

[0093] In some embodiments, different from the above embodiments, in the refrigerant circuit, the first fresh air side heat exchanger 41 and the second fresh air side heat exchanger 42 are swapped.

[0094] Specifically, refer to Figure 6 , the e-tube and c-tube of the first four-way valve 461 are respectively connected to the first end of the second fresh air side heat exchanger 42 and the first end of the third fresh air side heat exchanger 43. The second end of the second fresh air side heat exchanger 42 and the second end of the third fresh air side heat exchanger 43 are connected in series through the first throttle valve 471. A refrigerant circuit is formed between the compressor 45, the first four-way valve 461, the second fresh air side heat exchanger 42, the first throttle valve 471, and the third fresh air exhaust side heat exchanger 43.

[0095] The e-tube and c-tube of the second four-way valve 462 are respectively connected to the first end of the first fresh air side heat exchanger 41 and the first end of the exhaust air side heat exchanger 44. The second end of the first fresh air side heat exchanger 41 and the second end of the exhaust air side heat exchanger 44 are connected in series through the second throttle valve 472. A refrigerant circuit is formed between the compressor 45, the second four-way valve 462, the first fresh air side heat exchanger 41, the second throttle valve 472, and the exhaust air side heat exchanger 44.

[0096] The second end of the second branch 482 is connected between the second throttle valve 472 and the first fresh air side heat exchanger 41 .

[0097] In some embodiments, different from the above embodiments, reference Figure 7 , the first on-off valve 491 and the second on-off valve 492 can be replaced by a three-way valve 494 .

[0098] A first end of the three-way valve 494 is connected to the c tube of the first four-way valve, a second end of the three-way valve 494 is connected to a first end of the second branch 482 , and a third end of the three-way valve 494 is connected to a first end of the first branch 481 .

[0099] In cooling / heating mode, the first and second ends of the three-way valve 494 are disconnected, and the first and third ends of the three-way valve 494 are connected. In dehumidification mode, the first and second ends of the three-way valve 494 are connected, and the first and third ends of the three-way valve 494 are disconnected.

[0100] In some embodiments, different from the above embodiments, reference Figure 8 , the second on-off valve 492 and the third on-off valve 493 can be replaced by a three-way valve 494.

[0101] A first end of the three-way valve 494 is connected to the third fresh air side heat exchanger 43 , a second end of the three-way valve 494 is connected to a first end of the first branch 481 , and a third end of the three-way valve 494 is connected to a first end of the second branch 482 .

[0102] In cooling / heating mode, the first and second ends of the three-way valve 494 are disconnected, and the first and third ends of the three-way valve 494 are connected. In dehumidification mode, the first and second ends of the three-way valve 494 are connected, and the first and third ends of the three-way valve 494 are disconnected.

[0103] In the present application, by setting a first fresh air side heat exchanger 41 in the fresh air duct on the windward side of the full heat exchange core 20, the first fresh air side heat exchanger 41 can adjust the temperature of the outdoor air on the inlet side of the full heat exchange core 20, thereby solving the problem of a large amount of condensation generated inside the core when the temperature difference between indoor and outdoor is too large.

[0104] In the present application, by setting a first fresh air side heat exchanger 41 in the fresh air duct on the windward side of the full heat exchange core 20, in extremely low temperature weather, the first fresh air side heat exchanger 41 can preheat the outdoor air on the inlet side of the full heat exchange core 20, thereby avoiding the problem of ice blockage of the full heat exchange core 20.

[0105] In the present application, by arranging the exhaust-side heat exchanger 44 serving as an outdoor heat exchanger in the exhaust air duct, the volume of the outdoor unit can be reduced compared to when the outdoor heat exchanger is arranged in the outdoor unit.

[0106] In the present application, by setting a second fresh air side heat exchanger 42 in the fresh air duct on the air outlet side of the full heat exchange core 20, the second fresh air side heat exchanger 42 can adjust the supply air temperature of the fresh air fan so that the supply air temperature meets user needs.

[0107] In the present application, a second fresh air side heat exchanger 42 and a third fresh air side heat exchanger 43 are arranged in the fresh air duct on the air outlet side of the full heat exchange core 20. The third fresh air side heat exchanger 43 can be used as a condenser during dehumidification to achieve dehumidification reheating / dehumidification without cooling, thereby avoiding the problem of too low supply air temperature during dehumidification.

[0108] In the present application, the dehumidification mode is operated during defrosting to avoid the problem of cold air blowing during defrosting.

[0109] In the present application, by setting up two four-way valves to form a refrigerant circuit between two heat exchangers, the heat exchanger can be switched between the evaporator and the condenser, maximizing multiple heat exchanges of the outdoor air, effectively improving the comprehensive heat recovery efficiency of the fresh air fan while greatly improving the capacity of the unit.

[0110] In the present application, the refrigeration system is arranged in the shell 10, and the outdoor unit can be omitted, which reduces the overall cost of the unit and realizes the independent operation of the fresh air fan and the air-conditioning system. When the indoor cold and hot loads are low, the refrigerant system is turned off and only the ventilation mode is turned on, thereby reducing the energy consumption of the house.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0112] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A new air blower, characterized in that: include: Air duct, full heat exchange core and refrigeration system; The air duct includes a fresh air duct and an exhaust air duct; The total heat exchange core has a first channel and a second channel, the first channel is connected to the fresh air duct, and the second channel is connected to the exhaust air duct; The refrigeration system comprises: The first fresh air side heat exchanger, the second fresh air side heat exchanger and the third fresh air side heat exchanger are sequentially arranged in the fresh air duct according to the flow direction of the outdoor air, the first fresh air side heat exchanger is located on the windward side of the total heat exchange core, and the second fresh air side heat exchanger and the third fresh air side heat exchanger are located on the outlet side of the total heat exchange core; An exhaust side heat exchanger is arranged in the exhaust air duct and located at the air outlet side of the total heat exchange core; During cooling, the fresh air fan can allow the outdoor air to be cooled by the first fresh air side heat exchanger and then flow to the full heat exchange core; during heating, the fresh air fan can allow the outdoor air to be heated by the first fresh air side heat exchanger and then flow to the full heat exchange core.

2. The fresh air blower according to claim 1, characterized in that: The refrigeration system further comprises: A compressor, used to compress the refrigerant; a first four-way valve, used for selectively guiding the refrigerant compressed by the compressor to the first fresh air side heat exchanger or the third fresh air side heat exchanger; a second four-way valve, used for selectively directing the refrigerant compressed by the compressor to the second fresh air side heat exchanger or the exhaust air side heat exchanger; A first throttle valve is connected in series between the first fresh air side heat exchanger and the third fresh air side heat exchanger; A second throttle valve is connected in series between the second fresh air side heat exchanger and the exhaust air side heat exchanger; A first branch, a first end of which is connected between the first four-way valve and the third fresh air side heat exchanger, a second end of which is connected between the second four-way valve and the exhaust air side heat exchanger, and a first on-off valve is connected in series to the first branch; a second branch, a first end of which is connected between the third fresh air side heat exchanger and the first end of the first branch, a second end of which is connected between the second throttle valve and the second fresh air side heat exchanger, and a third throttle valve is connected in series to the second branch; The second on-off valve is connected in series between the first end of the first branch and the first end of the second branch.

3. The fresh air blower according to claim 1, characterized in that: The refrigeration system further comprises: A compressor, used to compress the refrigerant; a first four-way valve, used for selectively guiding the refrigerant compressed by the compressor to the second fresh air side heat exchanger or the third fresh air side heat exchanger; a second four-way valve, used for selectively directing the refrigerant compressed by the compressor to the first fresh air side heat exchanger or the exhaust air side heat exchanger; A first throttle valve is connected in series between the second fresh air side heat exchanger and the third fresh air side heat exchanger; A second throttle valve is connected in series between the first fresh air side heat exchanger and the exhaust air side heat exchanger; A first branch, a first end of which is connected between the first four-way valve and the third fresh air side heat exchanger, a second end of which is connected between the second four-way valve and the exhaust air side heat exchanger, and a first on-off valve is connected in series to the first branch; a second branch, a first end of which is connected between the third fresh air side heat exchanger and the first end of the first branch, a second end of which is connected between the second throttle valve and the first fresh air side heat exchanger, and a third throttle valve is connected in series to the second branch; The second on-off valve is connected in series between the first end of the first branch and the first end of the second branch.

4. The fresh air blower according to claim 2 or 3, characterized in that: The first on-off valve and the second on-off valve are replaced by a three-way valve, a first end of the three-way valve is connected to the first four-way valve, a second end of the three-way valve is connected to the first end of the second branch, and a third end of the three-way valve is connected to the first end of the first branch.

5. The fresh air blower according to claim 2 or 3, characterized in that: The compressor has a first air intake port, a second air intake port, a first air discharge port, and a second air discharge port; The first air intake port and the first air exhaust port are connected to the first four-way valve respectively; the second air intake port and the second air exhaust port are connected to the second four-way valve respectively.

6. The fresh air blower according to claim 2 or 3, characterized in that: A third on-off valve is connected in series to the second branch for controlling the on-off of the second branch.

7. The fresh air blower according to claim 6, characterized in that: The second on-off valve and the third on-off valve can be replaced by a three-way valve, the first end of the three-way valve is connected to the third fresh air side heat exchanger, the second end of the three-way valve is connected to the first end of the first branch, and the third end of the three-way valve is connected to the first end of the second branch.

8. The fresh air blower according to claim 2 or 3, characterized in that: During dehumidification operation, the first branch and the second branch are disconnected, and the third fresh air side heat exchanger is used as a condenser; During cooling or heating operation, the first branch is connected to the second branch, the second on-off valve is disconnected, and the third fresh air side heat exchanger is used as an evaporator during cooling and as a condenser during heating.

9. The fresh air blower according to claim 2, characterized in that: It comprises a shell; the refrigeration system is arranged in the shell.

10. A new air blower, characterized in that: include: Air duct, full heat exchange core and refrigeration system; The air duct includes a fresh air duct and an exhaust air duct; The total heat exchange core has a first channel and a second channel, the first channel is connected to the fresh air duct, and the second channel is connected to the exhaust air duct; The refrigeration system comprises: A first fresh air side heat exchanger is arranged in the fresh air duct and located on the windward side of the total heat exchange core; An exhaust side heat exchanger is arranged in the exhaust air duct and located at the air outlet side of the total heat exchange core; During cooling, the first fresh air side heat exchanger is used as an evaporator, and the exhaust air side heat exchanger is used as a condenser; the fresh air fan can cool the outdoor air by the evaporator and then flow to the full heat exchange core; During heating, the first fresh air side heat exchanger is used as a condenser, and the exhaust air side heat exchanger is used as an evaporator; the fresh air fan can make the outdoor air be heated by the condenser and then flow to the full heat exchange core.

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