Air treatment system

Abstract

The utility model discloses an air treatment system, and belongs to the technical field of air treatment. The air processing system comprises a compressor which is a double-air-suction compressor with a first air suction port and a second air suction port; an outdoor heat exchanger, an indoor unit heat exchanger and a first fresh air heat exchanger; a connector of the first four-way valve is connected with the first air suction port, and the first four-way valve can selectively guide a refrigerant compressed by the compressor to the outdoor heat exchanger or the first fresh air heat exchanger; a connector of the second four-way valve is connected with the second air suction port, and the second four-way valve selectively guides the refrigerant compressed in the compressor to the outdoor heat exchanger or the indoor unit heat exchanger; the first electronic expansion valve is connected between the outdoor heat exchanger and the first fresh air heat exchanger in series; the second electronic expansion valve is connected between the outdoor heat exchanger and the indoor unit heat exchanger in series. According to the air treatment system, the refrigerating system with the double air suction compressors is adopted to achieve two evaporation temperatures, and cost is reduced.

Description

Technical Field

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

[0002] As people's requirements for indoor air quality increase, they are no longer satisfied with the indoor temperature alone. Therefore, more and more air conditioners and fresh air blowers are used at the same time. Air conditioners are mainly used to adjust the indoor temperature, while fresh air blowers can adjust the humidity of the air while sending fresh air from outside into the room.

[0003] Due to the difference in evaporation temperatures required for sensible heat and latent heat treatment, the air conditioner and the fresh air fan each have a refrigeration system, and the two refrigeration systems bring about the problem of high costs. Utility Model Content

[0004] The present application provides an air handling system, which uses a refrigeration system with a double suction compressor to create two evaporation temperatures to achieve dehumidification and cooling for different needs while reducing costs.

[0005] In one aspect of the present application, an air handling system includes: a compressor for compressing a refrigerant, the compressor being a double suction compressor having a first suction port and a second suction port;

[0006] an outdoor heat exchanger for performing heat exchange between outdoor air and refrigerant;

[0007] The indoor heat exchanger is arranged in the indoor unit and is used to perform heat exchange between indoor air and refrigerant;

[0008] A first fresh air heat exchanger is provided in the fresh air fan and is used to perform heat exchange between outdoor fresh air and refrigerant;

[0009] a first four-way valve, one interface of which is connected to the first air intake port, the first four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the first fresh air heat exchanger according to whether the air handling system is in a cooling mode or a heating mode;

[0010] a second four-way valve, one interface of which is connected to the second air intake port, the second four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the indoor heat exchanger according to whether the air handling system is in a cooling mode or a heating mode;

[0011] A first electronic expansion valve, which is connected in series between the outdoor heat exchanger and the first fresh air heat exchanger;

[0012] The second electronic expansion valve is connected in series between the outdoor heat exchanger and the indoor heat exchanger.

[0013] In some embodiments, the fresh air fan includes: a second fresh air heat exchanger, which is arranged on the air outlet side of the first fresh air heat exchanger; in the refrigeration system, the second fresh air heat exchanger is connected in series with the indoor heat exchanger.

[0014] In some embodiments, the second electronic expansion valve, the second fresh air heat exchanger and the indoor heat exchanger are connected in series, and a third electronic expansion valve is connected in series between the second fresh air heat exchanger and the indoor heat exchanger.

[0015] In some embodiments, the third electronic expansion valve may be disposed in the fresh air fan or in the indoor unit.

[0016] In some embodiments, the first air intake port is connected to a low-pressure chamber of the compressor, and the second air intake port is connected to a medium-pressure chamber of the compressor.

[0017] In some embodiments, the fresh air fan includes a second fresh air heat exchanger, which is arranged on the air outlet side of the first fresh air heat exchanger; in the refrigeration system, the second fresh air heat exchanger is connected in parallel with the indoor heat exchanger.

[0018] In some embodiments, it also includes:

[0019] A fourth electronic expansion valve is connected in series to the branch where the second fresh air heat exchanger is located, and is used to adjust the refrigerant flow at the second fresh air heat exchanger;

[0020] The fifth electronic expansion valve is connected in series to the branch where the indoor heat exchanger is located, and is used to adjust the refrigerant flow at the indoor heat exchanger.

[0021] In some embodiments, the opening ratio of the fourth electronic expansion valve and the fifth electronic expansion valve = (area of ​​the second fresh air heat exchanger * air volume of the fresh air fan): (area of ​​the indoor unit heat exchanger * air volume of the indoor unit).

[0022] In some embodiments, the fourth electronic expansion valve is disposed in the fresh air fan, and in the refrigeration system the fourth electronic expansion valve is connected in series between the second fresh air heat exchanger and the second four-way valve;

[0023] The fifth electronic expansion valve is arranged in the indoor unit; in the refrigeration system, the fifth electronic expansion valve is connected in series between the indoor unit heat exchanger and the second four-way valve.

[0024] In another aspect of the present application, an air handling system includes: a compressor for compressing a refrigerant, the compressor being a double suction compressor having a first suction port and a second suction port;

[0025] an outdoor heat exchanger for performing heat exchange between outdoor air and refrigerant;

[0026] The indoor heat exchanger is arranged in the indoor unit and is used to perform heat exchange between indoor air and refrigerant;

[0027] A first fresh air heat exchanger is provided in the fresh air fan and is used to perform heat exchange between outdoor fresh air and refrigerant;

[0028] a first four-way valve, one interface of which is connected to the first air intake port, the first four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the first fresh air heat exchanger according to whether the air handling system is in a cooling mode or a heating mode;

[0029] a second four-way valve, one interface of which is connected to the second air intake port, the second four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the indoor heat exchanger according to whether the air handling system is in a cooling mode or a heating mode;

[0030] A first electronic expansion valve, which is connected in series between the outdoor heat exchanger and the first fresh air heat exchanger;

[0031] A second electronic expansion valve is connected in series between the outdoor heat exchanger and the indoor heat exchanger;

[0032] In cooling mode, the fresh air is cooled and dehumidified by the fresh air fan and then sent into the room; the indoor unit cools the indoor air and circulates it into the room. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 shows a schematic diagram of an air handling system according to some embodiments;

[0034] Figure 2 A schematic diagram showing a refrigeration system of an air handling system according to some embodiments;

[0035] Figure 3 A schematic diagram showing a refrigeration system of an air handling system according to some other embodiments;

[0036] Figure 4 A schematic diagram showing a refrigeration system of an air handling system according to yet other embodiments;

[0037] Figure 5 A schematic diagram of a refrigeration system of an air handling system according to still further embodiments is shown.

[0038] In the above figures, 100, air handling system;

[0039] 110, outdoor unit; 111, compressor; 1111, first air inlet; 1112, second air inlet; 112, outdoor heat exchanger; 1131, first four-way valve; 1132, second four-way valve; 114, outdoor fan; 115, second electronic expansion valve; 116, first electronic expansion valve; 117, third electronic expansion valve; 118, fourth electronic expansion valve; 119, fifth electronic expansion valve;

[0040] 120, indoor unit; 121, indoor unit heat exchanger; 122, indoor fan; 123, return air temperature and humidity sensor;

[0041] 130. Fresh air fan; 131. First fresh air heat exchanger; 132. Second fresh air heat exchanger; 133. Fresh air fan; 134. Fresh air temperature and humidity sensor. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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. Thus, 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.

[0045] 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.

[0046] Reference Figure 1 and Figure 2 The air treatment system 100 of the embodiment of the present application includes an outdoor unit 110, an indoor unit 120 and a fresh air fan 130.

[0047] The outdoor unit 110 is located in the outdoor space and is used to perform heat exchange between the refrigerant and the outdoor air. The indoor unit 120 is located in the indoor space and is used to perform heat exchange between the refrigerant and the indoor air. The outdoor unit 110 and the indoor unit 120 are two parts of the air conditioner.

[0048] The air handling system has a refrigeration system formed by connecting an outdoor unit 110 and an indoor unit 120 using an air pipe and a liquid pipe.

[0049] The outdoor unit 110 includes an outdoor unit casing 1101 which forms an appearance of the outdoor unit 110 .

[0050] The outdoor unit 110 includes a compressor 111 for sucking and compressing the refrigerant to make it a high-temperature and high-pressure state. A four-way valve for switching the refrigerant flow path in the cooling mode and the refrigerant flow path in the heating mode. An outdoor heat exchanger 112 for performing heat exchange between outdoor air and the refrigerant. The outdoor heat exchanger 112 condenses the refrigerant compressed by the compressor 111 in the cooling mode and evaporates the refrigerant reduced in pressure by the indoor unit 120 in the heating mode.

[0051] The outdoor unit 110 includes an outdoor fan 114 for blowing outdoor air to the outdoor heat exchanger 112 .

[0052] The outdoor unit 110 includes a second electronic expansion valve 115 for reducing the pressure of the refrigerant. In other embodiments, the second electronic expansion valve 115 may be disposed in the indoor unit 120.

[0053] The indoor unit 120 includes an indoor unit casing 1201 which forms the appearance of the indoor unit 120 .

[0054] The indoor unit 120 includes an indoor unit heat exchanger 121, which is disposed in an indoor unit housing 1201. The indoor unit heat exchanger 121 is used to perform heat exchange between the refrigerant and the indoor air. The indoor unit heat exchanger 121 evaporates the low-pressure liquid refrigerant in the cooling mode and condenses the high-pressure gaseous refrigerant in the heating mode.

[0055] The indoor unit 120 further includes an indoor fan 122 for blowing the air that has exchanged heat with the refrigerant through the indoor heat exchanger 121 into the indoor space.

[0056] The compressor 111, the four-way valve, the outdoor heat exchanger 112, the second electronic expansion valve 115, and the indoor heat exchanger 121 are connected to form a refrigeration system through a refrigerant pipeline. It should be noted that the gas-liquid separator, the oil separator, etc. in the refrigeration system are omitted in this application to simplify the description of this application.

[0057] The fresh air fan 130 is a device that can send outdoor air into the room.

[0058] In one embodiment of the fresh air fan 130 , the fresh air fan 130 includes a fresh air fan housing 1301 , which forms the appearance of the fresh air fan 130 .

[0059] The fresh air fan 130 includes a fresh air fan 133, which is arranged in a fresh air fan housing 1301 and is used to blow outdoor fresh air into the room.

[0060] The fresh air fan of the present application is combined with a refrigeration system to cool, dehumidify or heat the fresh air.

[0061] The fresh air fan 130 includes a first fresh air heat exchanger 131, which is located on the flow path of the fresh air. The first fresh air heat exchanger 131 can cool and dehumidify the fresh air when used as an evaporator. The first fresh air heat exchanger 131 can heat the fresh air when used as a condenser.

[0062] In other embodiments of the fresh air fan, the fresh air fan can discharge indoor polluted air to the outside while delivering outdoor air into the room, that is, the fresh air fan has a fresh air duct and an exhaust air duct.

[0063] In the prior art, the air conditioner and the fresh air blower 130 each have a refrigeration system, and two refrigeration systems will bring about the problem of high cost.

[0064] In order to solve this problem, in the air handling system of the present application, the fresh air blower 130 and the air conditioner share a refrigeration system to avoid the high cost problem caused by using two refrigeration systems.

[0065] In the refrigeration system of the present application, the compressor 111 is a double suction compressor having a first suction port 1111 and a second suction port 1112. The first suction port 1111 can be connected to the low pressure chamber of the compressor 111, and the second suction port 1112 can be connected to the medium pressure chamber of the compressor 111.

[0066] The four-way valve 113 has two valves, namely, a first four-way valve 1131 and a second four-way valve 1132. The first four-way valve 1131 is used to guide the refrigerant compressed by the compressor to the outdoor heat exchanger 112 in the cooling mode, and to guide the refrigerant compressed by the compressor to the first fresh air heat exchanger 131 in the heating mode. The second four-way valve 1132 is used to guide the refrigerant compressed by the compressor to the outdoor heat exchanger 112 in the cooling mode, and to guide the refrigerant compressed by the compressor to the indoor heat exchanger 121 in the heating mode.

[0067] According to an embodiment of the present application, in the refrigeration system, the exhaust port of the compressor 111 is connected to the d-pipe of the first four-way valve 1131. The s-pipe of the first four-way valve 1131 is connected to the first suction port 1111 of the compressor 111.

[0068] The e-tube of the first four-way valve 1131 is connected to one end of the outdoor heat exchanger 112, and the other end of the outdoor heat exchanger 112 is connected in series with the first electronic expansion valve 116, the first fresh air heat exchanger 131, and the c-tube of the first four-way valve 1131.

[0069] The exhaust port of the compressor 111 is connected to the d-pipe of the second four-way valve 1132 . The s-pipe of the second four-way valve 1132 is connected to the second intake port 1112 of the compressor 111 .

[0070] The e-tube of the second four-way valve 1132 is connected to one end of the outdoor heat exchanger 112, and the other end of the outdoor heat exchanger 112 is connected in series with the second electronic expansion valve 115, the indoor heat exchanger 121, and the c-tube of the second four-way valve 1132.

[0071] The following takes summer operation as an example to introduce the flow direction of the refrigeration system:

[0072] The high-temperature and high-pressure refrigerant is discharged from the exhaust port of the compressor 111, and then divided into two paths: one path flows to the first four-way valve 1131 to reach the outdoor heat exchanger 112; the other path flows to the second four-way valve 1132 to reach the outdoor heat exchanger 112; the refrigerant transfers heat to the outdoor air at the outdoor heat exchanger 112, and then becomes a low-temperature and high-pressure two-phase refrigerant, and then is divided into two paths:

[0073] Route 1: After throttling and reducing the pressure by the first electronic expansion valve 116, it becomes a low-temperature and low-pressure two-phase refrigerant, flows to the first fresh air heat exchanger 131, and then exchanges heat with the fresh air to become a high-temperature and low-pressure gaseous refrigerant, and then flows to the first four-way valve 1131, and returns to the low-pressure chamber of the compressor 111 through the first air intake port 1111.

[0074] Route 2: After throttling and reducing the pressure through the second electronic expansion valve 115, it becomes a low-temperature and low-pressure two-phase refrigerant, flows to the indoor heat exchanger 121, exchanges heat with the indoor air, absorbs the heat of the indoor air and becomes a high-temperature and low-pressure gaseous refrigerant, then flows to the second four-way valve 1132, and returns to the medium-pressure chamber of the compressor through the second air intake port 1112.

[0075] The refrigerant in the low-pressure chamber and the medium-pressure chamber is compressed into high-temperature and high-pressure refrigerant gas inside the compressor.

[0076] In the fresh air blower 130, the outdoor fresh air is sent to the room after being cooled and dehumidified by the first fresh air heat exchanger 131. In the indoor unit 120, the indoor air is sent to the room after being cooled by the indoor unit heat exchanger 121.

[0077] The air treatment system provided in the embodiment of the present application uses a double suction compressor 111, so that the refrigerant in the circuit where the first fresh air heat exchanger 131 of the fresh air blower 130 is located flows back to the low-pressure chamber of the compressor 111, and the refrigerant in the circuit where the indoor heat exchanger 121 of the indoor unit 120 is located flows back to the medium-pressure chamber of the compressor 111, and a refrigeration system can be used to achieve dual evaporation temperatures, thereby avoiding the problems of complex system design and high cost caused by using two refrigeration systems. In addition, the present application can realize separate processing of sensible heat and latent heat, that is, the high-temperature evaporator of the indoor unit 120 processes sensible heat, and the low-temperature evaporator of the fresh air blower 130 processes latent heat, which can improve the energy efficiency of the system.

[0078] In some embodiments, reference Figure 3 The fresh air fan 130 may include a second fresh air heat exchanger 132, which may be disposed at the air outlet side of the first fresh air heat exchanger 132. The second fresh air heat exchanger 132 may cool the fresh air when used as an evaporator. The second fresh air heat exchanger 132 may heat the fresh air when used as a condenser.

[0079] In the refrigeration system, the second fresh air heat exchanger 132 can be connected in series with the indoor heat exchanger 121.

[0080] In this embodiment, the refrigerant flow direction in summer operation is:

[0081] Route 1: After throttling and reducing the pressure by the first electronic expansion valve 116, it becomes a low-temperature and low-pressure two-phase refrigerant, flows to the first fresh air heat exchanger 131, and then exchanges heat with the fresh air to become a high-temperature and low-pressure gaseous refrigerant, and then flows to the first four-way valve 1131, and returns to the low-pressure chamber of the compressor 111 through the first air intake port 1111.

[0082] Route 2: After throttling and reducing the pressure through the second electronic expansion valve 115, it becomes a low-temperature and low-pressure two-phase refrigerant, flows to the second fresh air heat exchanger 132, and then exchanges heat with the fresh air to become a high-temperature and low-pressure gaseous refrigerant, and then flows into the indoor heat exchanger 121, exchanges heat with the indoor air, absorbs the heat of the indoor air to become a high-temperature and low-pressure gaseous refrigerant, and then flows to the second four-way valve 1132, and returns to the medium-pressure chamber of the compressor through the second air intake port 1112.

[0083] In the fresh air fan 130 , the outdoor fresh air is cooled and dehumidified by the first fresh air heat exchanger 131 , and then cooled by the second fresh air heat exchanger 132 before being sent to the room.

[0084] In some embodiments, reference Figure 4 The air treatment system further includes a third electronic expansion valve 117. The third electronic expansion valve 117 may be disposed in the fresh air blower 130, or the third electronic expansion valve 117 may be disposed in the indoor unit.

[0085] The second electronic expansion valve 115 , the second fresh air heat exchanger 132 , the third electronic expansion valve 117 and the indoor heat exchanger 121 are connected in series in sequence between the outdoor heat exchanger 112 and the c-tube of the second four-way valve 1132 .

[0086] In this embodiment, the refrigerant flow direction in summer operation is:

[0087] Route 1: After throttling and reducing the pressure by the first electronic expansion valve 116, it becomes a low-temperature and low-pressure two-phase refrigerant, flows to the first fresh air heat exchanger 131, and then exchanges heat with the fresh air to become a high-temperature and low-pressure gaseous refrigerant, and then flows to the first four-way valve 1131, and returns to the low-pressure chamber of the compressor 111 through the first air intake port 1111.

[0088] Route 2: Flows to the second fresh air heat exchanger 132 through the second electronic expansion valve 115 (fully open), exchanges heat with the fresh air to become a high-temperature, low-pressure liquid refrigerant, then reaches the third electronic expansion valve 117, is throttled and reduced in pressure by the third electronic expansion valve 117 to become a low-temperature, low-pressure liquid refrigerant, flows into the indoor heat exchanger 121, exchanges heat with the indoor air, absorbs the heat of the indoor air to become a high-temperature, low-pressure gaseous refrigerant, then flows to the second four-way valve 1132, and returns to the medium-pressure chamber of the compressor through the second air intake port 1112.

[0089] In the fresh air fan 130 , the outdoor fresh air is cooled and dehumidified by the first fresh air heat exchanger 131 , and is heated by the second fresh air heat exchanger 132 before being sent to the room.

[0090] Since the second electronic expansion valve 115 is fully open and does not play a throttling and pressure-reducing role, the second fresh air heat exchanger 132 is used as a condenser to heat the fresh air.

[0091] In order to prevent the temperature of the fresh air from being too low after being cooled and dehumidified by the first fresh air heat exchanger 131, the heating function of the second fresh air heat exchanger 132 can be realized by fully opening the second electronic expansion valve 115 to achieve the purpose of dehumidifying and reheating the fresh air.

[0092] In the embodiment provided in the present application, a third electronic expansion valve 117 is connected in series between the second fresh air heat exchanger 132 and the indoor unit heat exchanger 121, and the second electronic expansion valve 115 is controlled to be fully opened and the third electronic expansion valve 117 is throttled and pressure-reduced, thereby achieving dehumidification and reheating of the fresh air without affecting the refrigeration function of the indoor unit 120.

[0093] In some embodiments, reference Figure 5 In the refrigeration system, the second fresh air heat exchanger 132 and the indoor heat exchanger 121 are arranged in parallel, and both are connected in parallel between the second electronic expansion valve 115 and the c tube of the second four-way valve 1132.

[0094] The air handling system may include a first flow valve, and the first flow valve may be disposed in the fresh air fan 130 .

[0095] The first flow valve may be a solenoid valve or an electronic expansion valve. In this embodiment, the first flow valve is taken as the fourth electronic expansion valve 118 as an example for description.

[0096] The fourth electronic expansion valve 118 is connected in series to the branch where the second fresh air heat exchanger 132 is located, and is used to adjust the refrigerant flow at the second fresh air heat exchanger 132 .

[0097] The air handling system may include a second flow valve, and the second flow valve may be provided in the indoor unit 120 .

[0098] The second flow valve may be a solenoid valve or an electronic expansion valve. In this embodiment, the second flow valve is taken as the fifth electronic expansion valve 119 as an example for description.

[0099] The fifth electronic expansion valve 119 is connected in series to the branch where the indoor heat exchanger 121 is located, and is used to adjust the refrigerant flow at the indoor heat exchanger 121.

[0100] In the embodiment provided in the present application, by connecting the second fresh air heat exchanger 132 and the indoor heat exchanger 121 in parallel, and controlling the flow of the corresponding branches through the fourth electronic expansion valve 118 and the fifth electronic expansion valve 119, the refrigerant flow corresponds to the actual air volume, thereby improving the efficiency of the system.

[0101] According to an embodiment of the present application, the air treatment system may include a fresh air temperature and humidity sensor 134. The fresh air temperature and humidity sensor 134 may be disposed on the windward side of the first fresh air heat exchanger 131 to detect the temperature and humidity of the fresh air on the windward side of the first fresh air heat exchanger 131.

[0102] The air handling system may include a return air temperature and humidity sensor 123. The return air temperature and humidity sensor 123 is disposed on the windward side of the indoor heat exchanger 121 and is used to detect the temperature and humidity of the indoor air.

[0103] The fresh air dew point temperature TL1 can be calculated from the detection value of the fresh air temperature and humidity sensor 134, and the temperature of the first fresh air heat exchanger 131 = TL1 - ΔT. ΔT is a constant.

[0104] Since the first fresh air heat exchanger 131 needs to dehumidify the fresh air, the temperature of the first fresh air heat exchanger 131 cannot be lower than the fresh air dew point temperature TL1.

[0105] The indoor air dew point temperature TL2 can be calculated from the detection value of the return air temperature and humidity sensor 123, and the minimum temperature of the indoor heat exchanger 121 = TL2 + ΔT.

[0106] Since the indoor heat exchanger 121 is used only for processing sensible heat, the temperature of the indoor heat exchanger 121 cannot be lower than the indoor air dew point temperature TL2.

[0107] The opening ratio of the first electronic expansion valve 116 and the second electronic expansion valve 115 ≥

[0108] In some embodiments, the opening ratio of the fourth electronic expansion valve 118 and the fifth electronic expansion valve 119 = (area of ​​the second fresh air heat exchanger * air volume of the fresh air fan): (area of ​​the indoor unit heat exchanger * air volume of the indoor unit), thereby making the refrigerant flow rate of the parallel branch adapt to the air volume.

[0109] In the present application, by using a double-suction compressor 111, the refrigerant in the circuit where the first fresh air heat exchanger 131 of the fresh air fan 130 is located flows back to the low-pressure chamber of the compressor 111, and the refrigerant in the circuit where the indoor unit heat exchanger 121 of the indoor unit 120 is located flows back to the medium-pressure chamber of the compressor 111. Dual evaporation temperatures can be achieved by using one refrigeration system, avoiding the problems of complex system design and high cost caused by using two refrigeration systems.

[0110] In the present application, by using a double-suction compressor 111, the refrigerant in the circuit where the first fresh air heat exchanger 131 of the fresh air fan 130 is located flows back to the low-pressure chamber of the compressor 111, and the refrigerant in the circuit where the indoor unit heat exchanger 121 of the indoor unit 120 is located flows back to the medium-pressure chamber of the compressor 111. A single refrigeration system can be used to achieve dual evaporation temperatures. The evaporator of the indoor unit 120 processes sensible heat, and the evaporator of the fresh air fan 130 processes latent heat, thereby improving the energy efficiency of the system.

[0111] In the present application, by connecting a third electronic expansion valve 117 in series between the second fresh air heat exchanger 132 and the indoor unit heat exchanger 121, and by controlling the second electronic expansion valve 115 to be fully open and the third electronic expansion valve 117 to throttle and reduce the pressure, dehumidification and reheating of the fresh air is achieved without affecting the refrigeration function of the indoor unit 120.

[0112] In the present application, by connecting the second fresh air heat exchanger 132 and the indoor heat exchanger 121 in parallel, and controlling the flow of the corresponding branches through the fourth electronic expansion valve 118 and the fifth electronic expansion valve 119, the refrigerant flow corresponds to the actual air volume, thereby improving the efficiency of the system.

[0113] 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.

[0114] 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. An air treatment system, characterized in that: include: A compressor, used for compressing a refrigerant, wherein the compressor is a double-suction compressor having a first suction port and a second suction port; an outdoor heat exchanger for performing heat exchange between outdoor air and the refrigerant; An indoor heat exchanger is arranged in the indoor unit and is used to perform heat exchange between indoor air and the refrigerant; A first fresh air heat exchanger is provided in the fresh air fan and is used to perform heat exchange between outdoor fresh air and the refrigerant; a first four-way valve, one interface of which is connected to the first air intake port, the first four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the first fresh air heat exchanger according to whether the air handling system is in a cooling mode or a heating mode; a second four-way valve, one interface of which is connected to the second air intake port, the second four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the indoor heat exchanger according to whether the air handling system is in a cooling mode or a heating mode; A first electronic expansion valve, which is connected in series between the outdoor heat exchanger and the first fresh air heat exchanger; A second electronic expansion valve is connected in series between the outdoor heat exchanger and the indoor heat exchanger.

2. The air treatment system according to claim 1, characterized in that The new air blower comprises: A second fresh air heat exchanger is provided on the air outlet side of the first fresh air heat exchanger; In the refrigeration system, the second fresh air heat exchanger is connected in series with the indoor heat exchanger.

3. The air treatment system according to claim 2, characterized in that: The second electronic expansion valve, the second fresh air heat exchanger and the indoor heat exchanger are connected in series in sequence, and a third electronic expansion valve is connected in series between the second fresh air heat exchanger and the indoor heat exchanger.

4. The air treatment system according to claim 3, characterized in that: The third electronic expansion valve may be disposed in the fresh air fan or in the indoor unit.

5. The air treatment system according to claim 1, characterized in that The first air intake port is connected to a low-pressure chamber of the compressor, and the second air intake port is connected to a medium-pressure chamber of the compressor.

6. The air treatment system according to claim 1, characterized in that: The new air blower comprises: A second fresh air heat exchanger is provided on the air outlet side of the first fresh air heat exchanger; In the refrigeration system, the second fresh air heat exchanger is connected in parallel with the indoor heat exchanger.

7. The air treatment system according to claim 6, characterized in that Also includes: a fourth electronic expansion valve, connected in series to the branch where the second fresh air heat exchanger is located, and used for adjusting the refrigerant flow at the second fresh air heat exchanger; The fifth electronic expansion valve is connected in series to the branch where the indoor heat exchanger is located, and is used to adjust the refrigerant flow at the indoor heat exchanger.

8. The air treatment system according to claim 7, characterized in that: The opening ratio of the fourth electronic expansion valve and the fifth electronic expansion valve=(area of ​​the second fresh air heat exchanger*air volume of the fresh air fan):(area of ​​the indoor unit heat exchanger*air volume of the indoor unit).

9. The air treatment system according to claim 7, characterized in that: The fourth electronic expansion valve is arranged in the fresh air fan, and in the refrigeration system the fourth electronic expansion valve is connected in series between the second fresh air heat exchanger and the second four-way valve; The fifth electronic expansion valve is arranged in the indoor unit; in the refrigeration system, the fifth electronic expansion valve is connected in series between the indoor unit heat exchanger and the second four-way valve.

10. An air treatment system, characterized in that: include: A compressor, used for compressing a refrigerant, wherein the compressor is a double-suction compressor having a first suction port and a second suction port; an outdoor heat exchanger for performing heat exchange between outdoor air and the refrigerant; An indoor heat exchanger is arranged in the indoor unit and is used to perform heat exchange between indoor air and the refrigerant; A first fresh air heat exchanger is provided in the fresh air fan and is used to perform heat exchange between outdoor fresh air and the refrigerant; a first four-way valve, one interface of which is connected to the first air intake port, the first four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the first fresh air heat exchanger according to whether the air handling system is in a cooling mode or a heating mode; a second four-way valve, one interface of which is connected to the second air intake port, the second four-way valve being used to guide the refrigerant compressed in the compressor to the outdoor heat exchanger or the indoor heat exchanger according to whether the air handling system is in a cooling mode or a heating mode; A first electronic expansion valve, which is connected in series between the outdoor heat exchanger and the first fresh air heat exchanger; A second electronic expansion valve connected in series between the outdoor heat exchanger and the indoor heat exchanger; In cooling mode, the fresh air fan cools and dehumidifies the fresh air before sending it into the room; The indoor unit cools the indoor air and circulates it into the room.

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