Heat exchange system and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and discloses a heat exchange system which comprises a compressor, a four-way valve, an outdoor heat exchanger and a first indoor heat exchanger and further comprises a second indoor heat exchanger. The first indoor communicating pipeline is arranged between the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor communicating pipeline is provided with a first indoor expansion valve; the compressor comprises a first air suction port and a second air suction port, the first air suction port is communicated with the four-way valve, and the three-way valve is communicated with the second indoor heat exchanger, an air outlet of the compressor and the second air suction port. The heat exchange system forms a first refrigerant circulation flow path formed by connecting an air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the three-way valve and the second air suction port. According to the heat exchange system, reheating dehumidification can be achieved. The invention further discloses the air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, for example, to a heat exchange system and an air conditioner. Background Art

[0002] Air conditioners are essential electrical appliances for family life or work, which can adjust the user's indoor environment temperature, humidity, etc. to improve the user's living comfort. Among them, the operation modes of air conditioners usually include cooling mode, heating mode, dehumidification mode, etc.

[0003] When the existing air conditioner is running in dehumidification mode, in order to meet the dehumidification demand, it is usually necessary to reduce the evaporation temperature to a temperature lower than the return air dew point temperature and the temperature difference between the two is relatively large.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] When the user's indoor environment humidity is high, the air conditioner is usually controlled to operate in dehumidification mode to adjust the user's indoor environment humidity. However, when the air conditioner operates in dehumidification mode, the indoor heat exchanger of the air conditioner acts as an evaporator, that is, while dehumidifying, the user's indoor environment temperature is lowered, and the temperature and humidity cannot be controlled separately.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] An embodiment of the present disclosure provides a heat exchange system, including a compressor, a four-way valve, an outdoor heat exchanger and a first indoor heat exchanger, and also includes: a second indoor heat exchanger; a first indoor connecting pipeline, which is arranged between the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor connecting pipeline is provided with a first indoor expansion valve; and a three-way valve, wherein the compressor includes a first air intake port and a second air intake port, the first air intake port is connected to the four-way valve, and the three-way valve is respectively connected to the second indoor heat exchanger, the air outlet of the compressor, and the second air intake port, so that the heat exchange system forms a first refrigerant circulation flow path connected by the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the three-way valve, and the second air intake port.

[0009] In some optional embodiments, the first indoor heat exchanger is disposed adjacent to the second indoor heat exchanger.

[0010] In some optional embodiments, the first indoor expansion valve is arranged close to the first indoor heat exchanger, and the heat exchange system further includes: a second indoor expansion valve, which is arranged in the first indoor connecting pipeline and close to the second indoor heat exchanger.

[0011] In some optional embodiments, the heat exchange system also includes: an indoor and outdoor connecting pipeline, a first port connected to the outdoor heat exchanger, a second port connected to the pipeline between the first indoor expansion valve and the second indoor expansion valve, and the indoor and outdoor connecting pipeline is provided with a first electronic expansion valve, so that the heat exchange system forms a second refrigerant circulation flow path connected by the compressor outlet, the first indoor heat exchanger, the first electronic expansion valve, the outdoor heat exchanger, and the first air intake port.

[0012] In some optional embodiments, the heat exchange system also includes: a third indoor heat exchanger and a fourth indoor heat exchanger arranged adjacent to each other, wherein a second indoor connecting pipe is arranged between the third indoor heat exchanger and the fourth indoor heat exchanger, and the second indoor connecting pipe is provided with a third indoor expansion valve close to the third indoor heat exchanger, and a fourth indoor expansion valve close to the fourth indoor heat exchanger.

[0013] In some optional embodiments, the heat exchange system also includes: a four-way connecting pipe for connecting the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger, wherein the four-way connecting pipe is provided with a first refrigerant port and a second refrigerant port respectively connected to the first indoor heat exchanger and the third indoor heat exchanger.

[0014] In some optional embodiments, the first refrigerant port is a T-shaped connecting port respectively connected to the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger; or, the second refrigerant port is a T-shaped connecting port respectively connected to the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger.

[0015] In some optional embodiments, the heat exchange system also includes: a three-way connecting pipe for connecting the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger, wherein the three-way connecting pipe is provided with a third refrigerant port and a fourth refrigerant port respectively connected to the second indoor heat exchanger and the fourth indoor heat exchanger.

[0016] In some optional embodiments, the third refrigerant port is a T-shaped connecting port respectively connected to the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger; or, the fourth refrigerant port is a T-shaped connecting port respectively connected to the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger.

[0017] In some optional embodiments, the heat exchange system further includes: a third indoor connecting pipeline connected between the first indoor connecting pipeline and the second indoor connecting pipeline, and the third indoor connecting pipeline is connected to the indoor and outdoor connecting pipelines.

[0018] In some optional embodiments, the heat exchange system also includes a liquid storage branch, wherein the liquid storage branch includes: a liquid storage tank, provided with a liquid storage inlet and a liquid storage outlet; a liquid storage inlet pipeline, one end of which is connected to the liquid storage inlet, and the other end is connected between the outdoor heat exchanger and the first indoor heat exchanger; and, a liquid storage outlet pipeline, one end of which is connected to the liquid storage outlet, and the other end is connected to the first suction port or the second suction port of the compressor.

[0019] In some optional embodiments, the liquid storage branch further includes: a first liquid storage expansion valve, disposed at the liquid storage inlet; and a second liquid storage expansion valve, disposed at the liquid storage outlet.

[0020] In some optional embodiments, the heat exchange system further includes: a subcooling branch including a subcooling heat exchanger for subcooling a pipeline between the outdoor heat exchanger and the first indoor heat exchanger.

[0021] In some optional embodiments, the subcooling branch also includes: a subcooling inlet pipeline, one end of which is connected to the inlet of the subcooling heat exchanger, and the other end is connected to the pipeline between the first electronic expansion valve and the first indoor heat exchanger, and the subcooling inlet pipeline is provided with a subcooling expansion valve; and, a subcooling outlet pipeline, one end of which is connected to the outlet of the subcooling heat exchanger, and the other end is connected to the first suction port or the second suction port of the compressor.

[0022] The disclosed embodiment also provides an air conditioner, comprising the aforementioned heat exchange system.

[0023] The heat exchange system and air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0024] The heat exchange system provided by the embodiment of the present disclosure includes a compressor, a four-way valve, an outdoor heat exchanger and a first indoor heat exchanger, and further includes a second indoor heat exchanger, a three-way valve, and a first indoor connecting pipeline connecting the first indoor heat exchanger and the second indoor heat exchanger, and the compressor is a double-intake compressor, including a first intake port and a second intake port. Among them, the three-way valve is respectively connected to the second indoor heat exchanger, the air outlet of the compressor, and the second intake port. The heat exchange system provided by the embodiment of the present disclosure can form a first refrigerant circulation flow path connected by the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the three-way valve, and the second intake port.

[0025] When the first indoor heat exchanger and the second indoor heat exchanger are in the same room or the same indoor unit, the second indoor heat exchanger in the first refrigerant circulation flow path can be used as an evaporator to perform a dehumidification function. At this time, the first indoor heat exchanger acts as a condenser to compensate for the temperature reduction of the second indoor heat exchanger during dehumidification, that is, the air that has been dehumidified by the second indoor heat exchanger and has a lowered temperature is reheated, thereby achieving reheat dehumidification.

[0026] The first refrigerant circulation flow path provided in the embodiment of the present disclosure can realize reheat dehumidification, that is, while dehumidifying the indoor environment, it does not affect the temperature of the indoor environment, thereby realizing independent regulation of indoor temperature and humidity.

[0027] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0029] Figure 1 is a structural schematic diagram of a heat exchange system provided by an embodiment of the present disclosure;

[0030] Figure 2 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0031] Figure 3 It is a schematic diagram of a refrigerant flow path of a heat exchange system operating in a reheat dehumidification mode provided by an embodiment of the present disclosure;

[0032] Figure 4 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0033] Figure 5 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0034] Figure 6 is a structural schematic diagram of another heat exchange system provided by an embodiment of the present disclosure;

[0035] Figure 7 It is a schematic diagram of a refrigerant flow path of a heat exchange system in full operation of a cooling mode provided by an embodiment of the present disclosure;

[0036] Figure 8 is a schematic diagram of a refrigerant flow path of a heat exchange system in full operation heating mode provided by an embodiment of the present disclosure;

[0037] Fig. 9is a schematic diagram of a refrigerant flow path of another heat exchange system provided by an embodiment of the present disclosure operating in a reheat dehumidification mode;

[0038] Fig.10 It is a schematic diagram of a refrigerant flow path of a heat exchange system provided by an embodiment of the present disclosure for cooling part of the rooms and heating part of the rooms;

[0039] Fig.11 It is a schematic diagram of a refrigerant flow path of a heat exchange system provided by an embodiment of the present disclosure for cooling part of the rooms and reheating and dehumidifying part of the rooms;

[0040] Fig.12 It is a schematic diagram of a refrigerant flow path of a heat exchange system provided by an embodiment of the present disclosure for heating some rooms and reheating and dehumidifying some rooms;

[0041] Fig.13 It is a schematic diagram of the refrigerant flow path of a heat exchange system for non-stop defrosting provided by an embodiment of the present disclosure.

[0042] Reference numerals:

[0043] 1: compressor; 11: first air intake; 12: second air intake; 13: air outlet;

[0044] 2: four-way valve; 21: four-way connecting pipeline; 201: first refrigerant port; 202: second refrigerant port;

[0045] 3: outdoor heat exchanger; 301: indoor and outdoor connecting pipeline; 31: first electronic expansion valve;

[0046] 41: first indoor heat exchanger; 411: first indoor expansion valve; 42: second indoor heat exchanger; 421: second indoor expansion valve; 43: third indoor heat exchanger; 431: third indoor expansion valve; 44: fourth indoor heat exchanger; 441: fourth indoor expansion valve; 401: first indoor connecting pipeline; 402: second indoor connecting pipeline; 403: third indoor connecting pipeline;

[0047] 5: three-way valve; 51: three-way connecting pipeline; 501: third refrigerant port; 502: fourth refrigerant port;

[0048] 6: liquid storage tank; 61: first liquid storage expansion valve; 62: second liquid storage expansion valve;

[0049] 7: Subcooling heat exchanger; 71: Subcooling expansion valve. DETAILED DESCRIPTION

[0050] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0051] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0052] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0053] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0054] Unless otherwise stated, the term "plurality" means two or more.

[0055] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0056] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0057] An embodiment of the present disclosure provides a heat exchange system.

[0058] The heat exchange system provided by the embodiment of the present disclosure includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3 and a first indoor heat exchanger 41, and also includes a second indoor heat exchanger 42, a first indoor connecting pipeline 401 and a three-way valve 5. The first indoor connecting pipeline 401 is arranged between the first indoor heat exchanger 41 and the second indoor heat exchanger 42, and the first indoor connecting pipeline 401 is provided with a first indoor expansion valve 411. Among them, the compressor 1 includes a first air intake port 11 and a second air intake port 12, the first air intake port 11 is connected to the four-way valve 2, and the three-way valve 5 is respectively connected to the second indoor heat exchanger 42, the air outlet 13 of the compressor, and the second air intake port 12, so that the heat exchange system forms a first refrigerant circulation flow path connected by the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first indoor expansion valve 411, the second indoor heat exchanger 42, the three-way valve 5, and the second air intake port 12.

[0059] like Figures 1 to 3 As shown, the heat exchange system provided by the embodiment of the present disclosure includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3 and a first indoor heat exchanger 41, and the compressor 1 is a double-intake compressor, that is, including a first intake port 11 and a second intake port 12. The first intake port 11 of the compressor is connected to the four-way valve 2. The three interconnected channels of the three-way valve 5 are respectively connected to the second indoor heat exchanger 42, the air outlet 13 of the compressor, and the second air intake port 12, so that the heat exchange system forms a first refrigerant circulation flow path connected by the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first indoor expansion valve 411, the second indoor heat exchanger 42, the three-way valve 5, and the second air intake port 12.

[0060] Optionally, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 are arranged adjacent to each other, for example, the first indoor heat exchanger 41 and the second indoor heat exchanger 42 are arranged in the first indoor unit, and the first indoor heat exchanger 41 is close to the air outlet of the first indoor unit, and the second indoor heat exchanger 42 is close to the air inlet of the first indoor unit. The arrangement of the first refrigerant circulation flow path in the heat exchange system provided in the embodiment of the present disclosure can enable the heat exchange system to operate in a reheat dehumidification mode. Figure 3 The refrigerant flow route of the heat exchange system provided by the embodiment of the present disclosure in the reheat dehumidification mode is as follows:

[0061] When the heat exchange system is in reheat dehumidification operation, the four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube. The high-temperature and high-pressure gaseous refrigerant discharged from the air outlet 13 of the compressor enters the first indoor heat exchanger 41 through the four-way valve 2. The high-temperature and high-pressure refrigerant is cooled in the first indoor heat exchanger 41 and is divided into two paths. One path enters the second indoor heat exchanger 42 after throttling by the first indoor expansion valve 411 for evaporation and heat absorption, and then returns to the second air intake port 12 of the compressor, that is, the first refrigerant circulation flow path; the other path enters the outdoor heat exchanger 3, exchanges heat, and then returns to the first air intake port 11 of the compressor.

[0062] In the first refrigerant circulation flow path, the second indoor heat exchanger 42 serves as an evaporator and is close to the air inlet of the first indoor unit, and the first indoor heat exchanger 41 serves as a condenser and is close to the air outlet of the first indoor unit. After the high-humidity air in the user's room enters from the air inlet of the first indoor unit, it first passes through the second indoor heat exchanger 42 as an evaporator for cooling and dehumidification, and the cooled and dehumidified air then passes through the first indoor heat exchanger 41 as a condenser or reheater for reheating and heating. That is, reheat dehumidification is achieved.

[0063] It is understandable that if Figures 4 to 6 As shown, when the heat exchange system further includes a third indoor heat exchanger 43 and a fourth indoor heat exchanger 44, the refrigerant flow direction in the third indoor heat exchanger 43 is the same as that in the first indoor heat exchanger 41, and the refrigerant flow direction in the fourth indoor heat exchanger 44 is the same as that in the second indoor heat exchanger 42. That is, like the first indoor heat exchanger 41 and the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 can also perform reheating and dehumidification on the user's indoor environment.

[0064] Optionally, the first indoor expansion valve 411 is disposed close to the first indoor heat exchanger 41. The heat exchange system further includes a second indoor expansion valve 421. The second indoor expansion valve 421 is disposed in the first indoor communication pipeline 401 and close to the second indoor heat exchanger 42.

[0065] In the aforementioned first refrigerant circulation flow path capable of reheating and dehumidifying, the refrigerant flow and pressure of the first indoor heat exchanger 41 as a reheater can be adjusted by controlling the opening of the first indoor expansion valve 411, thereby controlling the reheat amount of the air after cooling and dehumidification. Furthermore, the refrigerant flow and pressure of the second indoor heat exchanger 42 as an evaporator can be adjusted by controlling the opening of the second indoor expansion valve 421, thereby controlling the dehumidification amount of the high-humidity air in the room. That is, the heat exchange system provided in the embodiment of the present disclosure realizes independent control of temperature and humidity, and can meet the user's needs for heating dehumidification, constant temperature dehumidification or cooling dehumidification by adjusting the opening of the first indoor expansion valve 411 and the second indoor expansion valve 421.

[0066] The heat exchange system provided by the embodiment of the present disclosure also includes an indoor-outdoor connecting pipeline 301. The first port of the indoor connecting pipeline is connected to the outdoor heat exchanger 3, and the second port is connected to the pipeline between the first indoor expansion valve 411 and the second indoor expansion valve 421. In addition, the indoor-outdoor connecting pipeline 301 is provided with a first electronic expansion valve 31, so that the heat exchange system forms a second refrigerant circulation flow path connected by the air outlet 13 of the compressor, the first indoor heat exchanger 41, the first electronic expansion valve 31, the outdoor heat exchanger 3, and the first air intake port 11.

[0067] As mentioned above, when the heat exchange system operates in the reheat dehumidification mode, the four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube, and the high-temperature and high-pressure refrigerant is cooled in the first indoor heat exchanger 41 and divided into two paths. One path enters the second indoor heat exchanger 42 after throttling by the first indoor expansion valve 411 for reheat dehumidification, that is, the first refrigerant circulation flow path; the other path enters the outdoor heat exchanger 3 for heat exchange and returns to the first air intake port 11 of the compressor, that is, the second refrigerant circulation flow path. In this way, the amount of refrigerant entering the first refrigerant circulation flow path can be controlled to adjust the amount of reheat dehumidification. For example, when constant temperature dehumidification is required, the amount of refrigerant required for the first refrigerant circulation flow path is small. At this time, other refrigerants can return to the compressor 1 through the second refrigerant circulation flow path.

[0068] The heat exchange system provided by the embodiment of the present disclosure further includes a third indoor heat exchanger 43 and a fourth indoor heat exchanger 44 which are arranged adjacent to each other, wherein a second indoor connecting pipe 402 is arranged between the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44, and the second indoor connecting pipe 402 is provided with a third indoor expansion valve 431 close to the third indoor heat exchanger 43, and a fourth indoor expansion valve 441 close to the fourth indoor heat exchanger 44. The heat exchange system further includes a third indoor connecting pipe 403 which is connected between the first indoor connecting pipe 401 and the second indoor connecting pipe 402, and the third indoor connecting pipe 403 is connected to the indoor and outdoor connecting pipe 301.

[0069] Optionally, the third indoor heat exchanger 43 is connected to the four-way valve 2, and the fourth indoor heat exchanger 44 is connected to the three-way valve 5. Optionally, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 are arranged in the second indoor unit, for example, the first indoor unit can be arranged in the first room of the user, and the second indoor unit can be arranged in the second room of the user.

[0070] Combination Fig. 9 When the heat exchange system provided by the embodiment of the present disclosure includes a first indoor heat exchanger 41 and a second indoor heat exchanger 42 located in the first room, and a third indoor heat exchanger 43 and a fourth indoor heat exchanger 44 located in the second room, the refrigerant flow route of the heat exchange system in the reheat dehumidification mode is as follows:

[0071] When the heat exchange system is in reheat dehumidification operation, the four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube. The high-temperature and high-pressure gaseous refrigerant discharged from the air outlet 13 of the compressor enters the first indoor heat exchanger 41 and the third indoor heat exchanger 43 through the four-way valve 2. The high-temperature and high-pressure refrigerant is cooled in the first indoor heat exchanger 41 and the third indoor heat exchanger 43 and is divided into two paths. One path enters the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 for evaporation and heat absorption, and then returns to the second air intake port 12 of the compressor, that is, the first refrigerant circulation flow path; the other path enters the outdoor heat exchanger 3, exchanges heat, and then returns to the first air intake port 11 of the compressor.

[0072] In the first refrigerant circulation flow path, the second indoor heat exchanger 42 serves as an evaporator and is close to the air inlet of the first indoor unit located in the first room, and the first indoor heat exchanger 41 serves as a condenser and is close to the air outlet of the first indoor unit located in the first room. After the high-humidity air in the user's room enters from the air inlet of the first indoor unit, it first passes through the second indoor heat exchanger 42 as an evaporator for cooling and dehumidification, and the cooled and dehumidified air then passes through the first indoor heat exchanger 41 as a condenser or reheater for reheating and heating. That is, reheating and dehumidification of the user's first room is achieved.

[0073] Similarly, in the first refrigerant circulation flow path, the fourth indoor heat exchanger 44 serves as an evaporator and is close to the air inlet of the second indoor unit in the second room, and the third indoor heat exchanger 43 serves as a condenser and is close to the air outlet of the second indoor unit in the second room. After the high-humidity air in the user's room enters from the air inlet of the second indoor unit, it first passes through the fourth indoor heat exchanger 44 as an evaporator for cooling and dehumidification, and the cooled and dehumidified air then passes through the third indoor heat exchanger 43 as a condenser or reheater for reheating and heating. That is, reheating and dehumidification of the user's second room is achieved.

[0074] Optionally, the heat exchange system further includes a four-way connecting pipeline 21, such as Figure 6 shown.

[0075] The four-way connecting pipe 21 is used to connect the four-way valve 2, the first indoor heat exchanger 41 and the third indoor heat exchanger 43, wherein the four-way connecting pipe 21 is provided with a first refrigerant port 201 and a second refrigerant port 202 respectively connected to the first indoor heat exchanger 41 and the third indoor heat exchanger 43.

[0076] In this way, the high-temperature and high-pressure refrigerant discharged from the compressor 1 can flow into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively through the four-way valve 2, or the refrigerant flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 can flow back to the compressor 1 after passing through the four-way valve 2.

[0077] For example, in the operation mode of heating all rooms at the same time, the four-way connecting pipe 21 can allow the high-temperature and high-pressure refrigerant discharged from the compressor 1 to flow into the first indoor heat exchanger 41 through the first refrigerant port 201 and into the third indoor heat exchanger 43 through the second refrigerant port 202 after passing through the four-way valve 2. Figure 8 or, in the mode of cooling all rooms at the same time, the refrigerant flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 flows back to the compressor 1 through the first refrigerant port 201 and the second refrigerant port 202, respectively, Figure 7 shown.

[0078] Optionally, the first refrigerant port 201 is a T-shaped connecting port connected to the four-way valve 2, the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively. Figure 6 shown.

[0079] In this way, the T-shaped first refrigerant port 201 can be used as a liquid separation port to flow the refrigerant flowing out of the four-way valve 2 into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively; similarly, the T-shaped first refrigerant port 201 can also be used as a confluence port to merge the refrigerant flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 and then flow back to the compressor 1 through the four-way valve 2.

[0080] Similarly, the second refrigerant port 202 is a T-shaped communication port respectively connected to the four-way valve 2, the first indoor heat exchanger 41 and the third indoor heat exchanger 43.

[0081] In this way, the T-shaped second refrigerant port 202 can be used as a liquid separation port to flow the refrigerant flowing out of the four-way valve 2 into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively; similarly, the T-shaped second refrigerant port 202 can also be used as a confluence port to merge the refrigerant flowing out of the first indoor heat exchanger 41 and the third indoor heat exchanger 43 and then flow back to the compressor 1 through the four-way valve 2.

[0082] Optionally, the heat exchange system further includes a three-way connecting pipeline 51, such as Figure 6 shown.

[0083] The three-way connecting pipe 51 is used to connect the three-way valve 5, the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44. The three-way connecting pipe 51 is provided with a third refrigerant port 501 and a fourth refrigerant port 502 connected to the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 respectively.

[0084] In this way, the high-temperature and high-pressure refrigerant discharged from the compressor 1 can flow into the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 respectively through the three-way valve 5, or the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 can flow back to the second intake port 12 of the compressor after passing through the three-way valve 5.

[0085] For example, in the operation mode of heating all rooms at the same time, the three-way connecting pipe 51 can allow the high-temperature and high-pressure refrigerant discharged from the compressor 1 to flow into the second indoor heat exchanger 42 through the third refrigerant port 501 and into the fourth indoor heat exchanger 45 through the fourth refrigerant port 502 after passing through the three-way valve 5. Figure 8 or, in the mode of cooling all rooms at the same time, the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 flows back to the second air intake port 12 of the compressor through the third refrigerant port 501 and the fourth refrigerant port 502, respectively. Figure 7 shown.

[0086] Optionally, the third refrigerant port 501 is a T-shaped communication port respectively connected to the three-way valve 5 , the second indoor heat exchanger 42 , and the fourth indoor heat exchanger 44 .

[0087] In this way, the T-shaped third refrigerant port 501 can be used as a liquid separation port to flow the refrigerant flowing out of the three-way valve 5 into the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 respectively; similarly, the T-shaped third refrigerant port 501 can also be used as a confluence port to merge the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 and then flow back to the second suction port 12 of the compressor through the three-way valve 5.

[0088] Similarly, the fourth refrigerant port 502 is a T-shaped communication port connected to the three-way valve 5, the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 respectively.

[0089] In this way, the T-shaped fourth refrigerant port 502 can be used as a liquid separation port to flow the refrigerant flowing out of the three-way valve 5 into the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 respectively; similarly, the T-shaped fourth refrigerant port 502 can also be used as a confluence port to merge the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 and then flow back to the second suction port 12 of the compressor through the three-way valve 5.

[0090] The heat exchange system provided in the embodiment of the present disclosure can operate in a mode where the first room and the second room are cooled simultaneously, such as Figure 7 shown.

[0091] The four-way valve 2 is switched to a state where the D tube is connected to the C tube, and the E tube is connected to the S tube. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor outlet 13 enters the outdoor heat exchanger 3 through the four-way valve 2. The first electronic expansion valve 31 is adjusted to an appropriate opening. After throttling, the refrigerant flows into the first indoor heat exchanger 41, the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 respectively. The openings of the first indoor expansion valve 411, the second indoor expansion valve 421, the third indoor expansion valve 431 and the fourth indoor expansion valve 441 can be controlled to adjust the refrigerant entering the first indoor heat exchanger 41, the second indoor heat exchanger 421, the third indoor expansion valve 431 and the fourth indoor expansion valve 441. The amount and pressure of refrigerant in the heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 are adjusted to further adjust the cooling effect of the first indoor heat exchanger 41, the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44. After that, the refrigerant in the first indoor heat exchanger 41 and the third indoor heat exchanger 43 flows back to the first air intake port 11 of the compressor through the four-way valve 2, and the refrigerant in the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 flows back to the second air intake port 12 of the compressor through the three-way valve 5. At this point, the refrigeration cycle is completed.

[0092] The heat exchange system provided in the embodiment of the present disclosure can operate in a mode of heating the first room and the second room at the same time, such as Figure 8 shown.

[0093] The four-way valve 2 is switched to a state where the D tube is connected to the E tube, and the C tube is connected to the S tube. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor outlet 13 is divided into two paths, one path enters the first indoor heat exchanger 41 and the third indoor heat exchanger 43 through the four-way valve 2, and the other path enters the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 through the three-way valve 5. At this time, the first indoor heat exchanger 41, the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 all act as condensers to play a heating role. Among them, the openings of the first indoor expansion valve 411, the second indoor expansion valve 421, the third indoor expansion valve 431 and the fourth indoor expansion valve 441 can be controlled respectively to adjust the amount and pressure of refrigerant entering the first indoor heat exchanger 41, the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44, thereby adjusting the heating effects of the first indoor heat exchanger 41, the second indoor heat exchanger 42, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44. After that, the refrigerant flows into the outdoor heat exchanger 3 through the first electronic expansion valve 31 for heat exchange, and then flows back to the first suction port 11 of the compressor, and the heating cycle is completed.

[0094] The heat exchange system provided in the embodiment of the present disclosure can operate in a mode of cooling some rooms and heating some rooms, for example, cooling the first room and heating the second room. Fig.10 shown.

[0095] When the heat exchange system is running for cooling and heating at the same time, the four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube, and the first indoor heat exchanger 41 and the fourth indoor heat exchanger 44 are controlled to be in a closed state. The high-temperature and high-pressure gaseous refrigerant discharged from the air outlet 13 of the compressor enters the third indoor heat exchanger 43 through the four-way valve 2. At this time, the third indoor heat exchanger 43 acts as a condenser to heat the second room. After that, the refrigerant is divided into two paths after throttling by the third indoor expansion valve 431. One path enters the second indoor heat exchanger 42 for heat exchange. At this time, the second indoor heat exchanger 42 acts as an evaporator to cool the first room, and then flows back to the second air intake port 12 of the compressor through the three-way valve 5; the other path enters the outdoor heat exchanger 3 for heat exchange, and then flows back to the first air intake port 11 of the compressor through the four-way valve 2. That is, the heat exchange system realizes the function of cooling some rooms and heating some rooms.

[0096] The heat exchange system provided in the embodiment of the present disclosure can operate in a mode of cooling some rooms and reheating and dehumidifying some rooms, for example, cooling the first room and reheating and dehumidifying the second room. Fig.11 shown.

[0097] The four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube, and the first indoor heat exchanger 41 is controlled to be in a closed state. The high-temperature and high-pressure refrigerant discharged from the air outlet 13 of the compressor enters the third indoor heat exchanger 43 through the four-way valve 2, and is divided into two paths after the heat exchange is completed and throttled by the third indoor expansion valve 431. One path of refrigerant enters the second indoor heat exchanger 42 located in the first room and the fourth indoor heat exchanger 44 located in the second room after being divided. At this time, the second indoor heat exchanger 42 plays a cooling function for the first room as an evaporator, and the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 play a reheating and dehumidifying function for the second room. After that, the refrigerant flowing out of the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 flows back to the second air intake port 12 of the compressor through the three-way valve 5; the other path enters the outdoor heat exchanger 3 for heat exchange, and then flows back to the first air intake port 11 of the compressor through the four-way valve 2. That is, the heat exchange system realizes the functions of cooling some rooms and reheating and dehumidifying some rooms.

[0098] The heat exchange system provided in the embodiment of the present disclosure can operate in a mode of heating some rooms and reheating and dehumidifying some rooms, for example, heating the first room and reheating and dehumidifying the second room. Fig.12 shown.

[0099] The four-way valve 2 is switched to the state where the D tube is connected to the E tube, and the C tube is connected to the S tube, and the second indoor heat exchanger 42 is controlled to be in a closed state. The high-temperature and high-pressure refrigerant discharged from the air outlet 13 of the compressor flows into the first indoor heat exchanger 41 located in the first room and the third indoor heat exchanger 43 located in the second room through the four-way valve 2. At this time, since the second indoor heat exchanger 42 in the first room is in a closed state, the first indoor heat exchanger 41 acts as a condenser to heat the first room; then, the refrigerant is divided into two paths, one of which flows into the fourth indoor heat exchanger 44 for heat exchange, and then flows back to the second air intake port 12 of the compressor through the three-way valve 5. At this time, the third indoor heat exchanger 43 and the fourth indoor heat exchanger 44 reheat and dehumidify the second room, and the other path flows into the outdoor heat exchanger 3 for heat exchange, and then flows back to the first air intake port 11 of the compressor through the four-way valve 2. That is, the heat exchange system realizes the function of heating some rooms and reheating and dehumidifying some rooms.

[0100] The heat exchange system provided in the embodiment of the present disclosure can operate in a non-stop defrosting mode, such as Fig.13 shown.

[0101] The four-way valve 2 is switched to a state where the C tube is connected to the D tube, and the S tube is connected to the E tube. The high-temperature and high-pressure refrigerant discharged from the air outlet 13 of the compressor is divided into two paths. One path enters the outdoor heat exchanger 3 through the four-way valve 2 for heat exchange, and then flows into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively after being throttled by the first electronic expansion valve 31; the other path enters the second indoor heat exchanger 42 and the fourth indoor heat exchanger 44 through the three-way valve 5 for heat exchange, and then flows into the first indoor heat exchanger 41 and the third indoor heat exchanger 43 respectively. Afterwards, the refrigerant in the first indoor heat exchanger 41 and the third indoor heat exchanger 43 flows back to the first air intake port 11 of the compressor through the four-way valve 2.

[0102] In this way, when the outdoor heat exchanger 3 is defrosted, the first indoor heat exchanger 41 of the first room serves as an evaporator, and at the same time, the second indoor heat exchanger 42 serves as a condenser, and the two compensate each other, that is, the temperature of the first room is not lowered during defrosting; similarly, the third indoor heat exchanger 43 of the second room serves as an evaporator, and at the same time, the fourth indoor heat exchanger 44 serves as a condenser, and the two compensate each other, that is, the temperature of the second room is not lowered during defrosting.

[0103] Optionally, the heat exchange system provided by the embodiment of the present disclosure further includes a liquid storage branch, wherein the liquid storage branch includes a liquid storage tank 6, a liquid storage inlet pipeline and a liquid storage outlet pipeline. The liquid storage tank 6 is provided with a liquid storage inlet and a liquid storage outlet; one end of the liquid storage inlet pipeline is connected to the liquid storage inlet, and the other end is connected between the outdoor heat exchanger 3 and the first indoor heat exchanger 41; one end of the liquid storage outlet pipeline is connected to the liquid storage outlet, and the other end is connected to the first air intake port 11 or the second air intake port 12 of the compressor. Optionally, the liquid storage branch further includes a first liquid storage expansion valve 61 provided at the liquid storage inlet and a second liquid storage expansion valve 62 provided at the liquid storage outlet.

[0104] The setting of the liquid storage branch can adjust the amount of refrigerant circulating in the heat exchange system. For example, in the low-load operation mode of low-temperature refrigeration, the refrigerant flowing out of the outdoor heat exchanger 3 includes liquid refrigerant. At this time, the first liquid storage expansion valve 61 arranged at the liquid storage inlet of the liquid storage tank 6 can be opened to allow part of the refrigerant flowing out of the outdoor heat exchanger 3 to enter the liquid storage tank 6 for storage.

[0105] It can be understood that the low-load operation mode is not limited to low-temperature refrigeration. In the aforementioned operation modes such as simultaneous cooling of the first room and the second room, simultaneous heating of the first room and the second room, cooling some rooms and heating some rooms, reheat dehumidification, cooling some rooms and reheating dehumidification of some rooms, heating some rooms and reheating dehumidification of some rooms, the amount of refrigerant circulating in the heat exchange system can be adjusted by the liquid storage tank 6.

[0106] Optionally, the other end of the liquid storage inlet pipeline can be arranged between the outdoor heat exchanger 3 and the first electronic expansion valve 31, or between the first electronic expansion valve 31 and the indoor heat exchanger, where the indoor heat exchanger can be the first indoor heat exchanger 41 or the third indoor heat exchanger 43.

[0107] Optionally, the heat exchange system provided by the embodiment of the present disclosure also includes a subcooling branch. The subcooling branch includes a subcooling heat exchanger 7 for subcooling the pipeline between the outdoor heat exchanger 3 and the first indoor heat exchanger 41, and the subcooling branch also includes a subcooling inlet pipeline and a subcooling outlet pipeline, wherein one end of the subcooling inlet pipeline is connected to the inlet of the subcooling heat exchanger 7, and the other end is connected to the pipeline between the first electronic expansion valve 31 and the first indoor heat exchanger 41, and the subcooling inlet pipeline is provided with a subcooling expansion valve 71; one end of the subcooling outlet pipeline is connected to the outlet of the subcooling heat exchanger 7, and the other end is connected to the first air intake port 11 or the second air intake port 12 of the compressor.

[0108] The refrigerant in the subcooling branch is a part separated from the second refrigerant circulation flow path. After throttling by the subcooling expansion valve 71, it becomes a low-temperature and low-pressure two-phase state, which further subcools the refrigerant flowing out of the outdoor heat exchanger 3, thereby increasing the subcooling degree of the refrigerant flowing out of the outdoor heat exchanger 3, thereby improving the energy efficiency of the heat exchange system.

[0109] It can be understood that in the aforementioned operating modes such as simultaneous cooling of the first room and the second room, simultaneous heating of the first room and the second room, cooling some rooms and heating some rooms, reheat dehumidification, cooling some rooms and reheating some rooms, heating some rooms and reheating some rooms, the subcooling degree of the refrigerant in the second refrigerant circulation flow path can be adjusted by the subcooling branch.

[0110] The present application also provides an air conditioner comprising any of the aforementioned heat exchange systems.

[0111] It is understandable that the aforementioned heat exchange system may be a refrigerant circulation heat exchange system in an air conditioner. The air conditioner provided in the embodiment of the present disclosure includes a heat exchange system of the aforementioned refrigerant circulation system, and may also include an indoor unit housing, and an indoor fan disposed in the indoor unit housing; an outdoor unit housing, and an outdoor fan disposed in the outdoor unit housing, and other structural components in the air conditioner.

[0112] The air conditioner provided by the embodiment of the present disclosure and including the aforementioned heat exchange system can meet different needs of users respectively, such as: cooling all rooms at the same time, heating all rooms at the same time, cooling some rooms and heating some rooms, reheat dehumidification, cooling some rooms and reheating and dehumidifying some rooms, heating some rooms and reheating and dehumidifying some rooms, and non-stop defrosting and other operating modes, thereby meeting the diversified needs of users for air conditioners.

[0113] Furthermore, it can be understood that the air conditioner provided in the embodiment of the present disclosure can realize reheat dehumidification, that is, the temperature and humidity are independently controlled, and heating dehumidification, cooling dehumidification, constant temperature dehumidification, etc. can be realized during the dehumidification process. At the same time, the adjustment amount of humidity can also be controlled, thereby improving the user's comfort during the use of the air conditioner.

[0114] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A heat exchange system, comprising a compressor, a four-way valve, an outdoor heat exchanger and a first indoor heat exchanger, characterized in that: Also includes: a second indoor heat exchanger; A first indoor communication pipeline is provided between the first indoor heat exchanger and the second indoor heat exchanger, and the first indoor communication pipeline is provided with a first indoor expansion valve; and, Three-way valve, Among them, the compressor includes a first air intake port and a second air intake port, the first air intake port is connected to the four-way valve, and the three-way valve is respectively connected to the second indoor heat exchanger, the air outlet of the compressor, and the second air intake port, so that the heat exchange system forms a first refrigerant circulation flow path connected by the air outlet of the compressor, the first indoor heat exchanger, the first indoor expansion valve, the second indoor heat exchanger, the three-way valve, and the second air intake port.

2. The heat exchange system according to claim 1, characterized in that: The first indoor heat exchanger is disposed adjacent to the second indoor heat exchanger.

3. The heat exchange system according to claim 2, characterized in that: The first indoor expansion valve is arranged close to the first indoor heat exchanger. The heat exchange system also includes: The second indoor expansion valve is arranged in the first indoor communicating pipeline and is arranged close to the second indoor heat exchanger.

4. The heat exchange system according to claim 3, characterized in that: Also includes: The indoor and outdoor communicating pipeline has a first port connected to the outdoor heat exchanger, a second port connected to the pipeline between the first indoor expansion valve and the second indoor expansion valve, and, The indoor and outdoor connecting pipeline is provided with a first electronic expansion valve so that the heat exchange system forms a second refrigerant circulation flow path connected by the air outlet of the compressor, the first indoor heat exchanger, the first electronic expansion valve, the outdoor heat exchanger, and the first air intake port.

5. The heat exchange system according to claim 3, characterized in that: Also includes: The third indoor heat exchanger and the fourth indoor heat exchanger are arranged adjacent to each other, wherein: A second indoor communication pipeline is provided between the third indoor heat exchanger and the fourth indoor heat exchanger, and the second indoor communication pipeline is provided with a third indoor expansion valve close to the third indoor heat exchanger and a fourth indoor expansion valve close to the fourth indoor heat exchanger.

6. The heat exchange system according to claim 5, characterized in that: Also includes: The four-way connecting pipeline is used to connect the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger. The four-way connecting pipeline is provided with a first refrigerant port and a second refrigerant port respectively connected to the first indoor heat exchanger and the third indoor heat exchanger.

7. The heat exchange system according to claim 6, characterized in that: The first refrigerant port is a T-shaped communication port connected to the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger respectively; or, The second refrigerant port is a T-shaped communication port respectively connected to the four-way valve, the first indoor heat exchanger and the third indoor heat exchanger.

8. The heat exchange system according to claim 5, characterized in that: Also includes: The three-way connecting pipeline is used to connect the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger. The three-way connecting pipeline is provided with a third refrigerant port and a fourth refrigerant port respectively connected to the second indoor heat exchanger and the fourth indoor heat exchanger.

9. The heat exchange system according to claim 8, characterized in that: The third refrigerant port is a T-shaped communication port connected to the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger respectively; or, The fourth refrigerant port is a T-shaped communication port respectively connected to the three-way valve, the second indoor heat exchanger and the fourth indoor heat exchanger.

10. The heat exchange system according to claim 5, characterized in that: Also includes: The third indoor communication pipeline is connected between the first indoor communication pipeline and the second indoor communication pipeline, and the third indoor communication pipeline is connected with the indoor and outdoor communication pipelines.

11. The heat exchange system according to claim 1, characterized in that: It also includes a liquid storage branch, wherein the liquid storage branch includes: A liquid storage tank is provided with a liquid storage inlet and a liquid storage outlet; a liquid storage inlet pipeline, one end of which is connected to the liquid storage inlet and the other end of which is connected between the outdoor heat exchanger and the first indoor heat exchanger; and, The liquid storage outlet pipeline has one end connected to the liquid storage outlet and the other end connected to the first air intake port or the second air intake port of the compressor.

12. The heat exchange system according to claim 11, characterized in that: The liquid storage branch also includes: A first liquid storage expansion valve is disposed at the liquid storage inlet; and The second liquid storage expansion valve is arranged at the liquid storage outlet.

13. The heat exchange system according to any one of claims 1 to 12, characterized in that: Also includes: The subcooling branch includes a subcooling heat exchanger for subcooling the pipeline between the outdoor heat exchanger and the first indoor heat exchanger.

14. The heat exchange system according to claim 13, characterized in that: The subcooling branch also includes: A subcooling inlet pipeline, one end of which is connected to the inlet of the subcooling heat exchanger, and the other end of which is connected to the pipeline between the first electronic expansion valve and the first indoor heat exchanger, and the subcooling inlet pipeline is provided with a subcooling expansion valve; and, The subcooling outlet pipeline has one end connected to the outlet of the subcooling heat exchanger and the other end connected to the first air intake port or the second air intake port of the compressor.

15. An air conditioner, characterized in that: Comprising the heat exchange system according to any one of claims 1 to 14.

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