Air conditioning system

Abstract

The present application discloses an air conditioning system, which includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a compressor, and a throttling device. The first heat exchanger is used to heat up or cool down the working medium in the air conditioning system. The second heat exchanger is used to heat up or cool down the working medium in the air conditioning system. The third heat exchanger is used to heat up or cool down the working medium in the air conditioning system. The compressor is used to compress the working medium in the air conditioning system. The throttling device is used to control the flow rate of the working medium in the air conditioning system; the first heat exchanger, the compressor, the second heat exchanger, the throttling device, and the third heat exchanger are connected in sequence. The advantage of the present application is to provide an air conditioning system that can take into account both heating and dehumidification.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and more particularly, to an air conditioning system. Background Art

[0002] Independent control of temperature and humidity is an effective way to reduce the energy consumption of air conditioners and improve the indoor human comfort. The fresh air air conditioning system mainly includes two devices: a chilled (hot) water unit and a fresh air dehumidification (humidification) machine. It separately controls the indoor temperature and humidity through separate refrigeration units. Due to the existing pipeline design, it is difficult for this system to meet the demand of heating and dehumidifying simultaneously in low-temperature and high-humidity weather.

[0003] In the related art, for example, Chinese Patent Document CN103868171A provides a fresh air system with a dehumidification function. This fresh air system can operate a refrigeration cycle in summer to cool and dehumidify fresh air and send it into the room; in winter, it operates a heating cycle to heat and humidify fresh air and send it into the room. However, it cannot achieve heating and dehumidifying simultaneously when the temperature is relatively low but the humidity is relatively high.

[0004] As can be seen from the above, the related art does not give any technical inspiration on how to simultaneously achieve the functions of heating and dehumidifying in a fresh air system. Summary of the Invention

[0005] The content part of this application is used to briefly introduce the concepts, which will be described in detail in the following detailed implementation part. The content part of this application is not intended to identify the key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] To solve the technical problems mentioned in the above background art part, some embodiments of this application provide an air conditioning system, which includes a first heat exchanger, a second heat exchanger, a third heat exchanger, a compressor, and a throttling device. The first heat exchanger is used to heat or cool the working medium in the air conditioning system. The second heat exchanger is used to heat or cool the working medium in the air conditioning system. The third heat exchanger is used to heat or cool the working medium in the air conditioning system. The compressor is used to compress the working medium in the air conditioning system. The throttling device is used to control the flow rate of the working medium in the air conditioning system; the first heat exchanger, the compressor, the second heat exchanger, the throttling device, and the third heat exchanger are connected in sequence.

[0007] Furthermore, the air conditioning system further includes a switching valve device, which is connected between the compressor and the second heat exchanger and / or the third heat exchanger; wherein, the switching valve device has a first switching state and a second switching state, so that when the switching valve device is in the first switching state, the compressor, the second heat exchanger, and the third heat exchanger are connected in sequence, and when the switching valve device is in the second switching state, the compressor is respectively connected to the second heat exchanger and the third heat exchanger.

[0008] Further, the switching valve device includes a three-way valve, which specifically has a first valve port, a second valve port, and a third valve port. The first valve port is connected to the first heat exchanger, the second valve port is connected to the compressor, and the third valve port is connected to the third heat exchanger. Wherein, when the switching valve device is in the first switching state, the first valve port communicates with the third valve port and the second valve port is closed; when the switching valve device is in the second switching state, the second valve port communicates with the third valve port and the first valve port is closed.

[0009] Further, the switching valve device includes a first switching valve, a second switching valve, and a third switching valve. The first switching valve is connected between the compressor and the third heat exchanger, the second switching valve is connected between the second heat exchanger and the third heat exchanger, and the third switching valve is connected between the second heat exchanger and the first heat exchanger.

[0010] Further, the air-conditioning system further includes a liquid storage tank, which is connected between the first interface of the third heat exchanger and the first interface of the first heat exchanger.

[0011] Further, the air-conditioning system further includes a flow path switching device, which has a first flow path state and a second flow path state such that when the flow path switching device is in the first flow path state, the working medium flows from the first interface of the flow path switching device to the second interface, and when the flow path switching device is in the second flow path state, the working medium flows from the second interface of the flow path switching device to the first interface.

[0012] Further, the flow path switching device includes a first flow path switching device, a second flow path switching device, and a third flow path switching device. The first flow path switching device is connected between the liquid storage tank and the first heat exchanger; the second flow path switching device is connected to the side of the second heat exchanger away from the compressor; the third flow path switching device is connected between the third heat exchanger and the second flow path switching device.

[0013] Further, the first flow path switching device includes a first check valve and a first electronic expansion valve, the second flow path switching device includes a second check valve and a second electronic expansion valve, the third flow path switching device includes a third check valve and a throttling device, and the throttling device includes a third expansion valve. Wherein, the first check valve and the first electronic expansion valve are in parallel, the second check valve and the second electronic expansion valve are in parallel, and the third check valve and the third electronic expansion valve are in parallel.

[0014] Further, the orientations of the first check valve and the third check valve are different.

[0015] Further, when the switching valve device is in the first switching state, the orientations of the second check valve and the third check valve are different.

[0016] The beneficial effect of the present application is that it provides an air-conditioning system that can balance heating and dehumidification.

[0017] More specifically, some embodiments of the present application may produce the following specific beneficial effects:

[0018] The switching valve device enables the air-conditioning system to switch between the heating and dehumidifying mode and the heating hot air mode, thus meeting multiple requirements simultaneously.

[0019] The switching valve device is a three-way valve, which reduces the pipeline design of the air-conditioning system and simplifies the position setting, making the implementation of the air-conditioning system convenient for construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application, making other features, objects, and advantages of the present application more obvious. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation of the present application.

[0021] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the elements and components are not necessarily drawn to scale.

[0022] In the drawings:

[0023] Figure 1 is a schematic diagram of the working medium flow direction of the air-conditioning system according to an embodiment of the present application in the first working state;

[0024] Figure 2 is Figure 1 another schematic diagram of the switching valve device of the air-conditioning system shown in;

[0025] Figure 3 is Figure 1 a schematic diagram of the working medium flow direction of the air-conditioning system shown in the second working state;

[0026] Figure 4 is an overall schematic diagram of the air-conditioning system according to an embodiment of the present application;

[0027] Figure 5 is a schematic diagram of the working medium flow direction in the single dehumidification case of the air-conditioning system according to an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of the working medium flow direction in the single hot air case of the air-conditioning system according to an embodiment of the present application;

[0029] Figure 7 is a schematic diagram of the working medium flow direction in the refrigeration and dehumidification case of the air-conditioning system according to an embodiment of the present application;

[0030] Figure 8 is a schematic diagram of the working medium flow direction in the first flow path state of the air-conditioning system according to an embodiment of the present application;

[0031] Figure 9 It is a schematic diagram of the working fluid flow direction of the second flow path state in the air conditioning system according to an embodiment of the present application.

[0032] Meanings of the reference numerals:

[0033] 100, air conditioning system;

[0034] 110, first heat exchanger;

[0035] 120, second heat exchanger;

[0036] 130, third heat exchanger;

[0037] 140, compressor;

[0038] 150, throttling device;

[0039] 160, switching valve device; 160a, first valve port; 160b, second valve port; 160c, third valve port; 161, first switching valve; 16s2, second switching valve; 163, third switching valve;

[0040] 170, liquid storage tank;

[0041] 180, flow path switching device; 181, first flow path switching device; 181a, first check valve; 181b, first electronic expansion valve; 182, second flow path switching device; 182a, second check valve; 182b, second electronic expansion valve; 183, third flow path switching device; 183a, third check valve; 183b, third electronic expansion valve;

[0042] Side1, first interface of the first switching device of the interface;

[0043] Side3, first interface of the third switching device;

[0044] Side3, first interface of the flow path switching device;

[0045] Side4, second interface of the flow path switching device. Detailed implementation manners

[0046] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the accompanying drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0047] In addition, it should be noted that for the convenience of description, only the parts related to the present application are shown in the drawings. Without conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other.

[0048] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used, they are only for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0049] In addition, in the description of the present application, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0050] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0051] It should be noted that the modifications of "one" and "multiple" mentioned in the present application are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0052] The present disclosure will be described in detail below with reference to the drawings and in combination with embodiments.

[0053] Such as Figures 1 to 4As shown in the figure, an air conditioning system 100 of the present application includes a first heat exchanger 110, a second heat exchanger 120, a third heat exchanger 130, a compressor 140, and a throttling device 150. The first heat exchanger 110 is used to heat up or cool down the working medium in the air conditioning system 100. The second heat exchanger 120 is used to heat up or cool down the working medium in the air conditioning system 100. The third heat exchanger 130 is used to heat up or cool down the working medium in the air conditioning system 100. The compressor 140 is used to compress the working medium in the air conditioning system 100. The throttling device 150 is used to control the flow rate of the working medium in the air conditioning system 100; the first heat exchanger 110, the compressor 140, the second heat exchanger 120, the throttling device 150, and the third heat exchanger 130 are connected in sequence.

[0054] Specifically, the compressor 140 compresses the working medium, so that the working medium flowing out of the compressor 140 is a high-temperature and high-pressure gaseous working medium. The compressor 140 is connected to the second heat exchanger 120. The second heat exchanger 120 is a water-side heat exchanger, that is, the second heat exchanger 120 heats the water in the capillary network passing through it. The hot water in the capillary network raises the lower indoor temperature. The capillary network described here is one of the forms at the end of the second heat exchanger 120, and it can also be a fan coil or a floor heating coil, etc. The capillary network described later can be replaced with a fan coil or a floor heating coil, etc., and will not be elaborated. The working medium passing through the second heat exchanger 120 becomes a high-temperature and high-pressure liquid. The high-temperature and high-pressure liquid working medium is further decompressed by the throttling device 150. Specifically, the throttling device 150 is an electronic expansion valve, which can more accurately control the flow rate of the working medium in the pipeline. At this time, the electronic expansion valve further cools the working medium so that the working medium becomes a low-temperature and low-pressure gas-liquid two-phase state. The low-temperature and low-pressure gas-liquid two-phase state working medium then passes through the third heat exchanger 130 to dehumidify the indoor circulating air. Therefore, this connection state can raise the indoor temperature and dehumidify the indoor at the same time, meeting the scenario where the indoor temperature is low and the indoor humidity is high.

[0055] More specifically, the air conditioning system 100 further includes a switching valve device 160, which is connected between the compressor 140, the second heat exchanger 120, and the third heat exchanger 130. The switching valve device 160 is connected between the compressor 140 and the second heat exchanger 120. The switching valve device 160 is connected between the compressor 140 and the third heat exchanger 130. Among them, the switching valve device 160 has a first switching state and a second switching state, so that when the switching valve device 160 is in the first switching state, the compressor 140, the second heat exchanger 120, and the third heat exchanger 130 are connected in sequence, and when the switching valve device 160 is in the second switching state, the compressor 140 is respectively connected to the second heat exchanger 120 and the third heat exchanger 130. The switching valve device 160 can quickly adjust the usage state of the air conditioning system 100, and saves the number of pipelines during the installation of the air conditioning system 100, reducing the design difficulty of the pipeline position.

[0056] More specifically, the switching valve device 160 includes a three-way valve having a first valve port 160a, a second valve port 160b, and a third valve port 160c. The first valve port 160a is connected to the first heat exchanger 110, the second valve port 160b is connected to the compressor 140, and the third valve port 160c is connected to the third heat exchanger 130. When the switching valve device 160 is in the first switching state, the first valve port 160a is connected to the third valve port 160c and the second valve port 160b is closed. When the switching valve device 160 is in the second switching state, the second valve port 160b is connected to the third valve port 160c and the first valve port 160a is closed.

[0057] More specifically, when the switching valve device 160 is in the first switching state, the compressor 140, the second heat exchanger 120, and the third heat exchanger 130 are connected in sequence. At this time, the compressor 140 compresses the working fluid, so that the working fluid flowing out of the compressor 140 is a high-temperature and high-pressure gaseous working fluid. The compressor 140 is connected to the second heat exchanger 120. The second heat exchanger 120 is a water-side heat exchanger, that is, the second heat exchanger 120 heats the water in the capillary network passing through it. The hot water in the capillary network raises the lower indoor temperature. The working fluid passing through the second heat exchanger 120 becomes a low-temperature and low-pressure gas phase. The low-temperature and low-pressure gas-phase working fluid is further throttled by the throttling device 150. Specifically, the throttling device 150 is an electronic expansion valve. At this time, the electronic expansion valve further cools the working fluid so that the working fluid becomes a low-temperature and low-pressure gas-liquid two-phase state. The low-temperature and low-pressure gas-liquid two-phase state then passes through the third heat exchanger 130 to dehumidify the indoor circulating air. Then the working fluid flows through the first heat exchanger 110. At this time, the air conditioning system 100 raises the indoor temperature and dehumidifies the indoor air at the same time, meeting the scenario where the indoor temperature is low and the indoor humidity is high.

[0058] When the switching valve device 160 is in the second switching state, the compressor 140 is connected to the second heat exchanger 120 and the third heat exchanger 130 respectively. At this time, the compressor 140 compresses the working fluid, so that the working fluid flowing out of the compressor 140 is a high-temperature and high-pressure gaseous working fluid. The high-temperature and high-pressure gaseous working fluid is divided into two parts. One part flows through the second heat exchanger 120. The second heat exchanger 120 is a water-side heat exchanger, that is, the second heat exchanger 120 heats the water in the capillary network passing through it. The hot water in the capillary network raises the lower indoor temperature. The other part of the working fluid flows through the third heat exchanger 130. The third heat exchanger 130 further heats the indoor circulating air. The heated circulating air and the capillary network together heat the indoor space. This state is applicable when the indoor temperature is low and the outdoor temperature is also low.

[0059] In one embodiment, the air conditioning system 100 further includes a liquid storage tank 170, which is connected between the first interface side2 of the third heat exchanger 130 and the first interface side1 of the first heat exchanger 110. The liquid storage tank 170 can store the excess working fluid in the air conditioning system 100 to cope with various working conditions that require different amounts of working fluid.

[0060] As Figure 8 and Figure 9 shown, specifically, the air conditioning system 100 further includes a flow path switching device 180, which has a first flow path state and a second flow path state such that when the flow path switching device 180 is in the first flow path state, the working fluid flows from the first interface side3 of the flow path switching device 180 to the second interface side4, and when the flow path switching device 180 is in the second flow path state, the working fluid flows from the second interface side4 of the flow path switching device 180 to the first interface side3. The flow path switching device 180 can change the flow direction of the working fluid by controlling its own flow path state to meet different usage scenarios of the air conditioning system 100.

[0061] More specifically, the flow path switching device 180 includes a first flow path switching device 181, a second flow path switching device 182, and a third flow path switching device 183. The first flow path switching device 181 is connected between the liquid storage tank 170 and the first heat exchanger 110; the second flow path switching device 182 is connected to the side of the second heat exchanger 120 away from the compressor 140; the third flow path switching device 183 is connected between the third heat exchanger 130 and the second flow path switching device 182.

[0062] More specifically, the first flow path switching device 181 includes a first check valve 181a and a first electronic expansion valve 181b, the second flow path switching device 182 includes a second check valve 182a and a second electronic expansion valve 182b, the third flow path switching device 183 includes a third check valve 183a and a throttling device 150, and the throttling device 150 includes a third expansion valve; wherein, the first check valve 181a and the first electronic expansion valve 181b are connected in parallel, the second check valve 182a and the second electronic expansion valve 182b are connected in parallel, and the third check valve 183a and the third electronic expansion valve 183b are connected in parallel. Among them, the orientations of the first check valve 181a and the third check valve 183a are different. When the switching valve device 160 is in the first switching state, the orientations of the second check valve 182a and the third check valve 183a are different.

[0063] When the flow path switching device 180 is in the first flow path state, the working medium flows from the first interface side3 of the flow path switching device to the second interface side4, that is, the working medium flows through the check valve side of the flow path switching device 180. In other words, when the first flow path switching device 181 is in the first flow path state, the working medium flows through the first check valve 181a; when the second flow path switching device 182 is in the first flow path state, the working medium flows through the second check valve 182a; when the third flow path switching device 183 is in the first flow path state, the working medium flows through the third check valve 183a.

[0064] When the flow path switching device 180 is in the second flow path state, the working medium flows from the second interface side4 of the flow path switching device 180 to the first interface side3, that is, the working medium flows through the electronic expansion valve side of the flow path switching device 180. In other words, when the first flow path switching device 181 is in the second flow path state, the working medium flows through the first electronic expansion valve 181b, and at this time; when the second flow path switching device 182 is in the second flow path state, the working medium flows through the second electronic expansion valve 182b; when the third flow path switching device 183 is in the second flow path state, the working medium flows through the third electronic expansion valve 183b.

[0065] In another embodiment, as Figure 2 shown, the switching valve device 160 includes a first switching valve 161, a second switching valve 162, and a third switching valve 163. The first switching valve 161 is disposed between the compressor 140 and the third heat exchanger 130, the second switching valve 162 is disposed between the second heat exchanger 120 and the third heat exchanger 130, and the third switching valve 163 is disposed between the second heat exchanger 120 and the first heat exchanger 110.

[0066] When the indoor temperature is relatively low and the humidity is relatively high, the second switching valve 162 is opened, and the first switching valve 161 and the third switching valve 163 are closed. That is, the high-temperature and high-pressure gas working medium flowing out of the compressor 140 flows through the second heat exchanger 120 to heat the water in the capillary network inside it so that the circulating water in the capillary network warms up the room. The low-temperature and low-pressure gas-phase working medium flowing out of the second heat exchanger 120 is further throttled by the throttling device 150. Specifically, the throttling device 150 is an electronic expansion valve. At this time, the electronic expansion valve further cools the working medium so that the working medium becomes a low-temperature and low-pressure gas-liquid two-phase state. The low-temperature and low-pressure gas-liquid two-phase state then passes through the third heat exchanger 130 to dehumidify the circulating air in the room. Therefore, this connection state can increase the indoor temperature and dehumidify the room at the same time.

[0067] More specifically, when the indoor temperature is low and the outdoor temperature is also low, the first switching valve 161 and the third switching valve 163 are opened, and the second switching valve 162 is closed. At this time, a separate pipeline needs to be introduced on one side of the throttling device 150 so that the high-temperature and high-pressure gaseous working medium flowing out of the compressor 140 does not pass through the throttling device 150, thereby heating the circulating air flowing through the third heat exchanger 130. Compared with the previous embodiment, this embodiment requires adding three separate valves and a new pipeline, which increases the workload during the construction and layout of the air-conditioning system 100. Moreover, according to the on-site construction environment, the additional valves also increase the difficulty of the overall design.

[0068] Therefore, according to the cooperation between the switching valve device 160 and the flow path switching device 180, the air-conditioning system 100 has multiple operating conditions. The following are relatively common operating conditions:

[0069] As Figure 5 shown, in the single dehumidification mode, the compressor 140, the first heat exchanger 110, the liquid storage tank 170, the third electronic expansion valve 183b, and the third heat exchanger 130 are connected in sequence. At this time, the high-temperature and high-pressure gaseous working medium flowing out of the compressor 140 exchanges heat through the first heat exchanger 110, and the working medium becomes high-temperature and high-pressure liquid. Then, it passes through the third electronic expansion valve 183b for further flow restriction to become a low-temperature and low-pressure gas-liquid two-phase state. The low-temperature and low-pressure liquid working medium flows through the third heat exchanger 130, and the third heat exchanger 130 performs low-temperature dehumidification on the indoor circulating air, reducing the indoor air humidity. This mode is suitable for the situation where the indoor temperature is appropriate but the indoor humidity is relatively high.

[0070] As Figure 6 shown, in the single hot air mode, the compressor 140, the third heat exchanger 130, the liquid storage tank 170, the first electronic expansion valve 181b, and the first heat exchanger 110 are connected in sequence. At this time, the high-temperature and high-pressure gaseous working medium produced by the compressor 140 passes through the third heat exchanger 130, and the third heat exchanger 130 heats the indoor circulating air. The high-temperature and high-pressure liquid-phase working medium flowing out of the third heat exchanger 130 is restricted by the first electronic expansion valve 181b and then becomes a low-temperature and low-pressure gas-liquid two-phase state working medium. Then, it exchanges heat with the outside through the first heat exchanger 110, further absorbing heat from the outdoor air and becoming a gaseous working medium to enter the compressor 140 to start the next cycle, which is suitable for the application scenario when the indoor temperature is relatively low.

[0071] As Figure 7As shown, in the refrigeration and dehumidification mode, the compressor 140 is connected to the first heat exchanger 110. The first heat exchanger 110 converts the high-temperature and high-pressure gaseous working medium flowing out of the compressor 140 into a high-temperature and high-pressure liquid working medium. The high-temperature and high-pressure liquid working medium is divided into two paths. One path passes through the third electronic expansion valve 183b to be depressurized and becomes a low-temperature and low-pressure gas-liquid two-phase state and enters the third heat exchanger 130 to dehumidify the circulating air in the room. The other path of the high-temperature and high-pressure liquid working medium passes through the second electronic expansion valve 182b to be depressurized and then becomes a low-temperature and low-pressure gas-liquid two-phase state and enters the second heat exchanger 120 to cool the capillary network circulating water in the second heat exchanger 120. Then, the circulating water cools the room. After the working media passing through the third heat exchanger 130 and the second heat exchanger 120 become gaseous, they enter the compressor 140 to start the next cycle. At this time, the air-conditioning system 100 is suitable for the usage scenario where the indoor temperature is relatively high and the humidity is relatively high, and it cools the room while dehumidifying the room.

[0072] As Figure 3 As shown, in the heating hot air mode, the high-temperature and high-pressure gaseous working medium coming out of the compressor 140 is divided into two paths. One path passes through the second heat exchanger 120 to heat the circulating water in the capillary network, and the capillary network heats the indoor air; the other path passes through the third heat exchanger 130 to heat the indoor circulating water, heating the indoor air doubly. After passing through the second heat exchanger 120 and the third heat exchanger 130, the working medium becomes a high-temperature and high-pressure gas-liquid two-phase state, and then passes through the electronic expansion valve to be depressurized and enters the first heat exchanger 110 to evaporate and absorb heat, becoming a gas, and at the same time absorbing the heat of the outdoor air, becoming a gaseous working medium and entering the compressor 140 to start the next cycle. At this time, the air-conditioning system 100 is applicable to the usage scenario where the indoor temperature is relatively low and the outdoor temperature is also relatively low.

[0073] The above description is only some preferred embodiments of the present disclosure and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. An air conditioning system, comprising: A first heat exchanger for heating or cooling the working medium in the air conditioning system; A second heat exchanger for heating or cooling the working medium in the air conditioning system; A third heat exchanger for heating or cooling the working medium in the air conditioning system; A compressor for compressing the working medium in the air conditioning system; A throttling device for controlling the flow rate of the working medium in the air conditioning system; Characterized in that: the first heat exchanger, the compressor, the second heat exchanger, the throttling device, and the third heat exchanger are connected in sequence; The air conditioning system further comprises: A switching valve device connected between the compressor and the second heat exchanger and / or the third heat exchanger; wherein, the switching valve device has a first switching state and a second switching state. When the switching valve device is in the first switching state, the compressor, the second heat exchanger, and the third heat exchanger are connected in sequence, the second heat exchanger heats the water in the capillary network passing through it, and the third heat exchanger dehumidifies the indoor circulating air; when the switching valve device is in the second switching state, the compressor is respectively connected to the second heat exchanger and the third heat exchanger, the second heat exchanger heats the water in the capillary network passing through it, and the third heat exchanger further heats the indoor circulating air.

2. The air conditioning system according to claim 1, characterized in that: The switching valve device includes a three-way valve, and the three-way valve specifically has a first valve port, a second valve port, and a third valve port. The first valve port is connected to the first heat exchanger, the second valve port is connected to the compressor, and the third valve port is connected to the third heat exchanger; Wherein, when the switching valve device is in the first switching state, the first valve port is connected to the third valve port and the second valve port is closed, and when the switching valve device is in the second switching state, the second valve port is connected to the third valve port and the first valve port is closed.

3. The air conditioning system according to claim 1, wherein: The switching valve device includes a first switching valve, a second switching valve, and a third switching valve. The first switching valve is connected between the compressor and the third heat exchanger, the second switching valve is connected between the second heat exchanger and the third heat exchanger, and the third switching valve is connected between the second heat exchanger and the first heat exchanger.

4. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a liquid storage tank, and the liquid storage tank is connected between the first interface of the third heat exchanger and the first interface of the first heat exchanger.

5. The air conditioning system according to any one of claims 1 to 4, characterized in that: The air conditioning system further comprises a flow path switching device, and the flow path switching device has a first flow path state and a second flow path state such that when the flow path switching device is in the first flow path state, the working medium flows from the first interface of the flow path switching device to the second interface, and when the flow path switching device is in the second flow path state, the working medium flows from the second interface of the flow path switching device to the first interface.

6. The air-conditioning system according to claim 5, characterized in that: The flow path switching device includes a first flow path switching device, a second flow path switching device, and a third flow path switching device. The first flow path switching device is connected between the liquid storage tank and the first heat exchanger; the second flow path switching device is connected to the side of the second heat exchanger away from the compressor; the third flow path switching device is connected between the third heat exchanger and the second flow path switching device.

7. The air conditioning system according to claim 6, characterized in that: The first flow path switching device includes a first check valve and a first electronic expansion valve. The second flow path switching device includes a second check valve and a second electronic expansion valve. The third flow path switching device includes a third check valve and the throttling device, and the throttling device includes a third electronic expansion valve; Among them, the first check valve and the first electronic expansion valve are in parallel, the second check valve and the second electronic expansion valve are in parallel, and the third check valve and the third electronic expansion valve are in parallel.

8. The air-conditioning system according to claim 7, characterized in that: The orientations of the first check valve and the third check valve are different.

9. The air conditioning system according to claim 8, characterized in that: When the switching valve device is in the first switching state, the orientations of the second check valve and the third check valve are different.

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