Air conditioning unit

Abstract

The invention provides an air conditioning unit. The air conditioning unit comprises a compressor, an air side heat exchanger, a user side heat exchanger, a throttling device, a first switching device and a second switching device. When the air conditioning unit is in a refrigeration mode, the gaseous refrigerant leaving from the compressor passes through the air side heat exchanger and then flows through the second switching device in the form of the liquid refrigerant, and after flowing through the throttling device, the refrigerant enters the user side heat exchanger and then flows out of an outlet of the user side heat exchanger. When the air conditioning unit is in a heating mode, the gaseous refrigerant leaving from the compressor enters the user side heat exchanger and then becomes a liquid refrigerant to flow out of an outlet of the user side heat exchanger, and the liquid refrigerant flows through the second switching device. The heat exchange efficiency of the user side heat exchanger of the air conditioning unit is high, the valve body of the second switching device of the air conditioning unit is small in size, the pipeline and the connector in the second switching device are small in size, and the pipeline and the connector connected with the second switching device are also small in size.

Description

Technical Field

[0001] This application relates to the field of air conditioning units. Background Technology

[0002] Air conditioning units are used to provide cooling or heating to users. However, existing user-side heat exchangers and / or air-side heat exchangers have poor heat exchange efficiency. Summary of the Invention

[0003] Exemplary embodiments of this application can solve at least some of the above-mentioned problems.

[0004] This application provides an air conditioning unit, which includes a compressor, an air-side heat exchanger, a user-side heat exchanger, a throttling device, a first switching device, and a second switching device. The compressor has a compressor outlet and a compressor inlet. The air-side heat exchanger has a first air-side heat exchanger port and a second air-side heat exchanger port. The user-side heat exchanger has a user-side heat exchanger inlet and a user-side heat exchanger outlet. The throttling device has a throttling device inlet and a throttling device outlet. The first switching device has a first switching device port, a second switching device port, a third switching device port, a fourth switching device port, and a fifth switching device port. The first switching device port is connected to the compressor outlet, the second switching device port is connected to the compressor inlet, the third switching device port is connected to the user-side heat exchanger inlet, the fourth switching device port is connected to the user-side heat exchanger outlet, and the fifth switching device port is connected to the first air-side heat exchanger port. The second switching device has a first port, a second port, a third port, a fourth port, and a fifth port. The first port is connected to the inlet of the throttling device, the second port is connected to the outlet of the throttling device, the third port is connected to the inlet of the user-side heat exchanger, the fourth port is connected to the outlet of the user-side heat exchanger, and the fifth port is connected to the second port of the air-side heat exchanger. The air conditioning unit has a cooling mode and a heating mode. The first switching device has a first state and a second state, and the second switching device has a first state and a second state. When the air conditioning unit is in the cooling mode, the first switching device is in the first switching device first state and the second switching device is in the second switching device first state. The gaseous refrigerant leaving the compressor passes through the air-side heat exchanger and then flows as liquid refrigerant through the second switching device. After passing through the throttling device, the refrigerant enters the user-side heat exchanger from the inlet and exits from the outlet. When the air conditioning unit is in the heating mode, the first switching device is in the first switching device second state and the second switching device is in the second switching device second state. The gaseous refrigerant leaving the compressor enters the user-side heat exchanger from the inlet and becomes liquid refrigerant, exiting from the outlet. The liquid refrigerant then flows through the second switching device.

[0005] According to the aforementioned air conditioning unit, when the first switching device is in the first switching device first state, the first switching device connects the first port of the first switching device with the fifth port of the first switching device, and connects the second port of the first switching device with the fourth port of the first switching device. When the first switching device is in the first switching device second state, the first switching device connects the first port of the first switching device with the third port of the first switching device, and connects the second port of the first switching device with the fifth port of the first switching device. When the second switching device is in the second switching device first state, the second switching device connects the first port of the second switching device with the fifth port of the second switching device, and connects the second port of the second switching device with the third port of the second switching device. When the second switching device is in the second switching device second state, the second switching device connects the first port of the second switching device with the fourth port of the second switching device, and connects the second port of the second switching device with the fifth port of the second switching device.

[0006] According to the aforementioned air conditioning unit, the air conditioning unit further includes a first outlet pipe for the user-side heat exchanger, a second outlet pipe for the user-side heat exchanger, a first inlet pipe for the user-side heat exchanger, and a second inlet pipe for the user-side heat exchanger. The first outlet pipe for the user-side heat exchanger connects the fourth port of the second switching device to the outlet of the user-side heat exchanger. One end of the second outlet pipe for the user-side heat exchanger connects to the fourth port of the first switching device, and the other end connects to the first outlet pipe for the user-side heat exchanger, thereby enabling communication between the fourth port of the first switching device and the outlet of the user-side heat exchanger. The first inlet pipe for the user-side heat exchanger connects the third port of the second switching device to the inlet of the user-side heat exchanger. One end of the second inlet pipe for the user-side heat exchanger connects to the third port of the first switching device, and the other end connects to the first inlet pipe for the user-side heat exchanger, thereby enabling communication between the third port of the first switching device and the inlet of the user-side heat exchanger.

[0007] According to the above-mentioned air conditioning unit, the first switching device and the second switching device are five-way valves.

[0008] According to the aforementioned air conditioning unit, the first switching device is a five-way valve. The second switching device includes a first valve line, a second valve line, a third valve line, and a fourth valve line. The first valve line is configured to allow refrigerant to flow unidirectionally from the fifth port of the second switching device to the first port of the second switching device; the second valve line is configured to allow refrigerant to flow unidirectionally from the second port of the second switching device to the third port of the second switching device; the third valve line is configured to allow refrigerant to flow unidirectionally from the second port of the second switching device to the fifth port of the second switching device; and the fourth valve line is configured to allow refrigerant to flow unidirectionally from the fourth port of the second switching device to the first port of the second switching device.

[0009] According to the aforementioned air conditioning unit, the first switching device further has a sixth port, which is connected to the second port of the air-side heat exchanger. The second switching device further has a sixth port, which is connected to the first port of the air-side heat exchanger. When the first switching device is in the first switching device first state, the first switching device connects the first port to the fifth port and the second port to the fourth port. When the first switching device is in the first switching device second state, the first switching device connects the first port to the third port and the second port to the sixth port. When the second switching device is in the second switching device first state, the second switching device connects the first port to the fifth port and the second port to the third port. When the second switching device is in the second switching device second state, the second switching device connects the first port to the fourth port and the second port to the sixth port.

[0010] According to the aforementioned air conditioning unit, the air conditioning unit further includes a first air-side heat exchanger pipe, an additional first air-side heat exchanger pipe, a second air-side heat exchanger pipe, and an additional second air-side heat exchanger pipe. The first air-side heat exchanger pipe connects the fifth port of the first switching device to the first port of the air-side heat exchanger. One end of the additional first air-side heat exchanger pipe connects to the sixth port of the second switching device, and the other end of the additional first air-side heat exchanger pipe connects to the first air-side heat exchanger pipe, thereby enabling communication between the sixth port of the second switching device and the first port of the air-side heat exchanger. The second air-side heat exchanger pipe connects the second port of the air-side heat exchanger to the fifth port of the second switching device. One end of the additional second air-side heat exchanger pipe connects to the sixth port of the first switching device, and the other end of the additional second air-side heat exchanger pipe connects to the second air-side heat exchanger pipe, thereby enabling communication between the second port of the air-side heat exchanger and the sixth port of the first switching device.

[0011] According to the above-mentioned air conditioning unit, the first switching device and the second switching device are six-way valves.

[0012] According to the aforementioned air conditioning unit, the first switching device is a six-way valve. The second switching device includes a fifth valve line, a sixth valve line, a seventh valve line, and an eighth valve line. The fifth valve line is configured to allow refrigerant to flow unidirectionally from the fifth port of the second switching device to the first port of the second switching device; the sixth valve line is configured to allow refrigerant to flow unidirectionally from the second port of the second switching device to the third port of the second switching device; the seventh valve line is configured to allow refrigerant to flow unidirectionally from the second port of the second switching device to the sixth port of the second switching device; and the eighth valve line is configured to allow refrigerant to flow unidirectionally from the fourth port of the second switching device to the first port of the second switching device.

[0013] According to the aforementioned air conditioning unit, the first switching device and the second switching device are configured to switch synchronously.

[0014] The user-side heat exchanger of the air conditioning unit in this application has high heat exchange efficiency because, regardless of whether it is in cooling or heating mode, the flow direction of the fluid on the user side is opposite to the flow direction of the refrigerant in the air conditioning unit, thus forming a counterflow. The counterflowing user-side fluid and refrigerant can exchange heat more fully, thereby achieving high heat exchange efficiency without changing the internal structure of the heat exchanger.

[0015] Furthermore, the valve body of the second switching device of the air conditioning unit of this application is small, and the pipes and interfaces within the second switching device are also small, as are the pipes and interfaces connected to it. Specifically, regardless of whether it is in cooling or heating mode, the refrigerant flowing through the second switching device of the air conditioning unit of this application is a liquid refrigerant or a two-phase refrigerant with low dryness (i.e., a mixture of gaseous and liquid refrigerant, but with a smaller proportion of gaseous refrigerant). Since the density of liquid refrigerant or two-phase refrigerant with low dryness is greater than that of pure gaseous refrigerant, the flow area of ​​the second switching device of the air conditioning unit of this application is smaller when the air conditioning unit is under the same load (i.e., the same flow requirement). Therefore, the size of the valve body, pipes, and interfaces of the second switching device is smaller than that of a switching device that requires pure gaseous refrigerant to flow through (e.g., a switching device directly connected to the inlet or outlet of the compressor). Attached Figure Description

[0016] The features and advantages of this application can be better understood by reading the following detailed description with reference to the accompanying drawings, in which the same reference numerals denote the same parts, wherein: Figure 1 This is a system diagram of the air conditioning unit according to the first embodiment of this application; Figure 2A yes Figure 1 The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 2B yes Figure 1 The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 3A This is a fluid flow diagram of the air conditioning unit in cooling mode according to the second embodiment of this application; Figure 3B yes Figure 3A The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 4A This is a system diagram of an air conditioning unit according to the third embodiment of this application; Figure 4B yes Figure 4A The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 4C yes Figure 4A The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 5 This is a system diagram of the air conditioning unit according to the fourth embodiment of this application; Figure 6A This is a fluid flow diagram of the air conditioning unit in cooling mode according to the fifth embodiment of this application; Figure 6B yes Figure 6AThe diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 7A This is a system diagram of the air conditioning unit according to the sixth embodiment of this application; Figure 7B yes Figure 7A The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 7C yes Figure 7A The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Detailed Implementation

[0017] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that in the following drawings, the same components are referred to by the same reference numerals.

[0018] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although terms indicating direction, such as "upper," "lower," "left," "right," "inner," and "outer," are used herein to describe various exemplary structural portions and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed herein can be arranged in different orientations, these terms indicating direction are illustrative only and should not be considered limiting.

[0019] Figure 1 This is a system diagram of the air conditioning unit according to the first embodiment of this application. Figure 1As shown, the air conditioning unit includes a compressor 102, an air-side heat exchanger 106, a user-side heat exchanger 108, a throttling device 130, a first switching device 110, and a second switching device 120. The compressor 102 has a compressor outlet 1021 and a compressor inlet 1022. The air-side heat exchanger 106 has an air-side heat exchanger first port 1061 and an air-side heat exchanger second port 1062. The user-side heat exchanger 108 has a user-side heat exchanger inlet 1081 and a user-side heat exchanger outlet 1082. The throttling device 130 has a throttling device inlet 1301 and a throttling device outlet 1302. The first switching device 110 has a first switching device first port 1101, a first switching device second port 1102, a first switching device third port 1103, a first switching device fourth port 1104, and a first switching device fifth port 1105. The second switching device 120 has a first switching device port 1201, a second switching device port 1202, a third switching device port 1203, a fourth switching device port 1204, and a fifth switching device port 1205. The first switching device port 1101 is connected to the compressor outlet 1021. The second switching device port 1102 is connected to the compressor inlet 1022. The third switching device port 1103 is connected to the user-side heat exchanger inlet 1081. The fourth switching device port 1104 is connected to the user-side heat exchanger outlet 1082. The fifth switching device port 1105 is connected to the air-side heat exchanger first port 1061. The second switching device port 1201 is connected to the throttling device inlet 1301. The second switching device port 1202 is connected to the throttling device outlet 1302. The third switching device port 1203 is connected to the user-side heat exchanger inlet 1081. The fourth switching device port 1204 is connected to the user-side heat exchanger outlet 1082. The fifth port 1205 of the second switching device is connected to the second port 1062 of the air-side heat exchanger.

[0020] like Figure 1 As shown, the air conditioning unit also includes multiple pipes. The various components are connected via these pipes, as detailed below. Figure 1 Introduction: The compressor outlet 1021 is connected to the first port 1101 of the first switching device via the first pipe 161. The compressor inlet 1022 is connected to the second port 1102 of the first switching device via the second pipe 162. The first port 1061 of the air-side heat exchanger is connected to the fifth port 1105 of the first switching device via the third pipe (i.e., the first pipe 163 of the air-side heat exchanger). The second port 1062 of the air-side heat exchanger is connected to the fifth port 1205 of the second switching device via the fourth pipe (i.e., the second pipe 164 of the air-side heat exchanger). The inlet 1301 of the throttling device is connected to the first port 1201 of the second switching device via the fifth pipe 165. The outlet 1302 of the throttling device is connected to the second port 1202 of the second switching device via the sixth pipe 166. The outlet 1082 of the user-side heat exchanger is connected to the fourth port 1204 of the second switching device via the first pipe 141 of the user-side heat exchanger outlet. The user-side heat exchanger inlet 1081 is connected to the third port 1203 of the second switching device via the user-side heat exchanger inlet first pipe 143. The fourth port 1104 of the first switching device is connected to the user-side heat exchanger outlet 1082 via the user-side heat exchanger outlet second pipe 142 and the user-side heat exchanger outlet first pipe 141. Specifically, one end of the user-side heat exchanger outlet second pipe 142 is connected to the first switching device fourth port 1104, and the other end of the user-side heat exchanger outlet second pipe 142 is connected to the user-side heat exchanger outlet first pipe 141, thereby enabling the first switching device fourth port 1104 to communicate with the user-side heat exchanger outlet 1082. The third port 1103 of the first switching device is connected to the user-side heat exchanger inlet 1081 via the user-side heat exchanger inlet second pipe 144. Specifically, one end of the second inlet pipe 144 of the user-side heat exchanger is connected to the third port 1103 of the first switching device, and the other end of the second inlet pipe 144 of the user-side heat exchanger is connected to the first inlet pipe 143 of the user-side heat exchanger, thereby enabling the third port 1103 of the first switching device to communicate with the inlet 1081 of the user-side heat exchanger.

[0021] In embodiments of this application, the user-side heat exchanger 108 further includes a user inlet pipe 171 and a user outlet pipe 172. Fluid on the user side can enter the user-side heat exchanger 108 through the user inlet pipe 171, exchange heat with the refrigerant in the air conditioning unit in the user-side heat exchanger 108 to become a lower-temperature fluid, and then flow out of the user-side heat exchanger 108 through the user outlet pipe 172.

[0022] The first switching device 110 has a first switching device first state and a first switching device second state. When the first switching device 110 is in the first switching device first state, the first switching device 1101 is connected to the first switching device fifth port 1105, and the first switching device second port 1102 is connected to the first switching device fourth port 1104. When the first switching device 110 is in the first switching device second state, the first switching device 1101 is connected to the first switching device third port 1103, and the first switching device second port 1102 is connected to the first switching device fifth port 1105. The second switching device 120 has a second switching device first state and a second switching device second state. When the second switching device 120 is in the second switching device first state, the second switching device 1201 is connected to the second switching device fifth port 1205, and the second switching device second port 1202 is connected to the second switching device third port 1203. When the second switching device 120 is in the second switching device second state, the second switching device 120 connects the first port 1201 of the second switching device with the fourth port 1204 of the second switching device, and connects the second port 1202 of the second switching device with the fifth port 1205 of the second switching device.

[0023] The air conditioning unit of this application has a cooling mode and a heating mode. When the air conditioning unit is in cooling mode, the first switching device 110 is in the first switching device first state and the second switching device 120 is in the second switching device first state. When the air conditioning unit is in heating mode, the first switching device 110 is in the first switching device second state and the second switching device 120 is in the second switching device second state.

[0024] Figure 2A yes Figure 1 The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 2AAs shown, the refrigerant is compressed into a high-temperature, high-pressure refrigerant in compressor 102. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flowing out of compressor outlet 1021 flows through first pipe 161, enters first switching device 110 through first port 1101, and flows out from first switching device fifth port 1105. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flows through first pipe 163 of air-side heat exchanger and enters air-side heat exchanger 106 through first port 1061. In air-side heat exchanger 106, the high-temperature, high-pressure refrigerant exchanges heat with a lower-temperature fluid on the air side, thereby becoming a high-temperature, high-pressure refrigerant (i.e., liquid refrigerant). Subsequently, the liquid refrigerant flows through second pipe 164 of air-side heat exchanger and enters second switching device 120 through second switching device fifth port 1205, and flows out from second switching device first port 1201. Liquid refrigerant, after passing through throttling device 130, becomes low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness). It then flows through sixth pipe 166 and enters second switching device 120 through second port 1202, exiting from third port 1203. Subsequently, the two-phase refrigerant with low dryness enters user-side heat exchanger 108 through user-side heat exchanger inlet first pipe 143. In user-side heat exchanger 108, the low-temperature, low-pressure refrigerant exchanges heat with the user-side fluid at a higher temperature, thereby lowering the temperature of the user-side fluid to provide the user with a lower-temperature fluid (e.g., for providing chilled water for air conditioning). After exchanging heat with the user-side fluid in user-side heat exchanger 108, the low-temperature, low-pressure refrigerant becomes low-temperature, low-pressure gaseous refrigerant. The gaseous refrigerant flowing from the user-side heat exchanger outlet 1082 flows through a portion of the user-side heat exchanger outlet first pipe 141 and the user-side heat exchanger outlet second pipe 142, then enters the first switching device 110 via the fourth port 1104 and exits from the first switching device second port 1102. Subsequently, the gaseous refrigerant re-enters the compressor 102 via the second pipe 162 and the compressor inlet 1022. This completes the refrigeration cycle.

[0025] like Figure 2A As shown, when the air conditioning unit is in cooling mode, the fluid on the user side of the user-side heat exchanger 108 flows in from the user inlet pipe 171 and out from the user outlet pipe 172. The refrigerant in the air conditioning unit flows in from the user-side heat exchanger inlet 1081 and out from the user-side heat exchanger outlet 1082. In the user-side heat exchanger 108, the flow direction of the fluid on the user side is opposite to the flow direction of the refrigerant in the air conditioning unit, thus forming a counter-flow.

[0026] Figure 2B yes Figure 1 The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 2BAs shown, the refrigerant is compressed into a high-temperature, high-pressure refrigerant in compressor 102. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flowing from compressor outlet 1021 flows through first pipe 161, enters first switching device 110 through first port 1101, and exits from first switching device third port 1103. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flows through a portion of user-side heat exchanger inlet second pipe 144 and user-side heat exchanger inlet first pipe 143, and then enters user-side heat exchanger 108 through user-side heat exchanger inlet 1081. In user-side heat exchanger 108, the high-temperature, high-pressure refrigerant exchanges heat with a lower-temperature fluid on the user side, thereby raising the temperature of the user-side fluid to provide the user with a higher-temperature fluid (e.g., for providing hot water for air conditioning). After exchanging heat with the user-side fluid in user-side heat exchanger 108, the high-temperature, high-pressure refrigerant becomes a high-temperature, high-pressure refrigerant (i.e., liquid refrigerant). Subsequently, the liquid refrigerant flows out from the user-side heat exchanger outlet 1082, flows through the first pipe 141 of the user-side heat exchanger outlet, enters the second switching device 120 through the fourth port 1204, and flows out from the first port 1201 of the second switching device. After passing through the throttling device 130, the liquid refrigerant becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness), flows through the sixth pipe 166, enters the second switching device 120 through the second port 1202, and flows out from the fifth port 1205 of the second switching device. Subsequently, the two-phase refrigerant with low dryness enters the air-side heat exchanger 106 through the second port 1062. After exchanging heat with the higher-temperature fluid on the air side in the air-side heat exchanger 106, the low-temperature, low-pressure refrigerant becomes a low-temperature, low-pressure gaseous refrigerant. Subsequently, the gaseous refrigerant enters the fifth port 1105 of the first switching device through the first pipe 163 of the air-side heat exchanger and flows out from the second port 1102 of the first switching device. Then, the gaseous refrigerant re-enters the compressor 102 through the second pipe 162 and the compressor inlet 1022. This completes the heating cycle.

[0027] like Figure 2B As shown, when the air conditioning unit is in heating mode, the fluid on the user side of the user-side heat exchanger 108 flows in from the user inlet pipe 171 and out from the user outlet pipe 172. The refrigerant in the air conditioning unit flows in from the user-side heat exchanger inlet 1081 and out from the user-side heat exchanger outlet 1082. In the user-side heat exchanger 108, the flow direction of the fluid on the user side is opposite to the flow direction of the refrigerant in the air conditioning unit, thus forming a counter-flow.

[0028] The applicant of this application has discovered that, in the prior art, the poor heat exchange efficiency of the user-side heat exchanger of the air conditioning unit is due to the fact that the flow direction of the fluid on the user side in the user-side heat exchanger is the same as the flow direction of the refrigerant in the air conditioning unit, thus forming a co-current flow.

[0029] The user-side heat exchanger of the air conditioning unit in this application has high heat exchange efficiency because, regardless of whether it is in cooling or heating mode, the flow direction of the fluid on the user side is opposite to the flow direction of the refrigerant in the air conditioning unit, thus forming a counterflow. The counterflowing user-side fluid and refrigerant can exchange heat more fully, thereby achieving high heat exchange efficiency without changing the internal structure of the heat exchanger.

[0030] Furthermore, the valve body of the second switching device 120 of the air conditioning unit of this application is small, and the pipes and interfaces inside the second switching device 120 are also small in size, as are the pipes and interfaces connected to it. Specifically, in both cooling and heating modes, the compressor outlet 1021 and compressor inlet 1022 through which the pure gaseous refrigerant flows are connected to the first switching device via pipelines, and the refrigerant flowing through the second switching device 120 is either liquid or a two-phase refrigerant with low dryness. Since the density of liquid refrigerant or the density of two-phase refrigerant with low dryness is greater than that of pure gaseous refrigerant, the flow area of ​​the second switching device 120 of the air conditioning unit of this application is smaller under the same load (i.e., the same flow requirement). Therefore, the size of the valve body, pipes, and interfaces of the second switching device 120 is smaller than that of switching devices that require the flow of pure gaseous refrigerant (e.g., switching devices directly connected to the compressor inlet or outlet).

[0031] Figure 3A This is a fluid flow diagram of the air conditioning unit in cooling mode according to the second embodiment of this application. Figure 3B yes Figure 3A The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figures 3A-3B As shown, in the air conditioning unit of the second embodiment of this application, the first switching device 110 and the second switching device 120 are five-way valves. The connection of the five ports of the five-way valve is the same as that of the first switching device 110 and the second switching device 120 in the first embodiment of this application, and will not be described again here.

[0032] Therefore, the air conditioning unit of the second embodiment of this application can also achieve a high heat exchange efficiency of the user-side heat exchanger, and the valve body of the second switching device 120, which is a five-way valve, has a small volume, a small interface size, and a small size of the pipe and interface connected to the second switching device 120.

[0033] Figure 4A This is a system diagram of an air conditioning unit according to the third embodiment of this application. Figure 4AThe first switching device 110 in the air conditioning unit of the third embodiment shown is a five-way valve. The connection of the five ports of the five-way valve is the same as that of the first switching device 110 in the second embodiment of this application, and will not be described again here. The second switching device 120 includes several pipes and valves, which are referred to below. Figure 4A Introduction: like Figure 4A As shown, the second switching device 120 includes a first valve line 401, a second valve line 402, a third valve line 403, and a fourth valve line 404. The first valve line 401 is configured to allow refrigerant to flow unidirectionally from the fifth port 1205 of the second switching device to the first port 1201. The second valve line 402 is configured to allow refrigerant to flow unidirectionally from the second port 1202 of the second switching device to the third port 1203. The third valve line 403 is configured to allow refrigerant to flow unidirectionally from the second port 1202 of the second switching device to the fifth port 1205. The fourth valve line 404 is configured to allow refrigerant to flow unidirectionally from the fourth port 1204 of the second switching device to the first port 1201. More specifically, the fourth valve line 404 connects the first port 1201 and the fourth port 1204 of the second switching device. The second valve pipe 402 connects to the second port 1202 and the third port 1203 of the second switching device. One end of the third valve pipe 403 is connected to the fifth port 1205 of the second switching device, and the other end of the third valve pipe 403 is connected to the second valve pipe 402, thereby enabling communication between the second port 1202 and the fifth port 1205 of the second switching device. One end of the first valve pipe 401 is connected to the third valve pipe 403, and the other end of the first valve pipe 401 is connected to the fourth valve pipe 404, thereby enabling communication between the fifth port 1205 and the first port 1201 of the second switching device.

[0034] In the third embodiment of this application, the second switching device 120 further includes a first one-way valve 411, a second one-way valve 412, a third one-way valve 413, and a fourth one-way valve 414. The first one-way valve 411 is disposed on the first valve line 401 and configured to allow fluid in the first valve line 401 to flow unidirectionally from the fifth port 1205 of the second switching device to the first port 1201 of the second switching device. The second one-way valve 412 is disposed on the second valve line 402 and configured to allow fluid in the second valve line 402 to flow unidirectionally from the second port 1202 of the second switching device to the third port 1203 of the second switching device. The third one-way valve 413 is disposed on the third valve line 403 and configured to allow fluid in the third valve line 403 to flow unidirectionally from the second port 1202 of the second switching device to the fifth port 1205 of the second switching device. The fourth one-way valve 414 is provided on the fourth valve pipeline 404 and is configured to allow the fluid in the fourth valve pipeline 404 to flow unidirectionally from the fourth port 1204 of the second switching device to the first port 1201 of the second switching device.

[0035] Figure 4B yes Figure 4A The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 4B The direction of refrigerant flow and Figure 2A The same flow direction of the refrigerant in the middle section will not be described again. For example... Figure 4B As shown, the gaseous refrigerant exchanges heat with a cooler fluid on the air side in the air-side heat exchanger 106, thus becoming a high-temperature, high-pressure refrigerant (i.e., a liquid refrigerant). Subsequently, the liquid refrigerant flows through the second pipe 164 of the air-side heat exchanger and enters the second switching device 120 through the fifth port 1205. In the second switching device 120, the liquid refrigerant flows through a portion of the third valve pipe 403 and then into the first valve pipe 401. After passing through the first check valve 411 on the first valve pipe 401, it passes through a portion of the fourth valve pipe 404 and then flows out from the first port 1201 of the second switching device. The liquid refrigerant flowing out from the first port 1201 of the second switching device flows through the throttling device 130 and becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness), then enters the second switching device 120 through the second port 1202. In the second switching device 120, the liquid refrigerant flows through the second valve line 402, and after passing through the second one-way valve 412 on the second valve line 402, it flows out of the second switching device 120 from the third port 1203.

[0036] It should be noted that, since the pressure at point A where the third valve line 403 connects to the first valve line 401 is higher than the pressure at point B where the third valve line 403 connects to the second valve line 402, the refrigerant will not flow from point B where the third valve line 403 connects to the second valve line 402 through the third check valve 413 to point A where the third valve line 403 connects to the first valve line 401.

[0037] It should also be noted that, since the pressure at the connection point C between the first valve line 401 and the fourth valve line 404 is higher than the pressure at the connection point D between the first outlet line 141 and the second outlet line 142 of the user-side heat exchanger, the refrigerant will not flow from the connection point D between the first outlet line 141 and the second outlet line 142 of the user-side heat exchanger to the connection point C between the first valve line 401 and the fourth valve line 404.

[0038] Figure 4C yes Figure 4A The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 4C The direction of refrigerant flow and Figure 2B The same flow direction of the refrigerant in the middle section will not be described again. For example... Figure 4C As shown, the gaseous refrigerant exchanges heat with a lower-temperature fluid on the user side in the user-side heat exchanger 108, becoming a high-temperature, high-pressure refrigerant (i.e., a liquid refrigerant). Subsequently, the liquid refrigerant flows out from the user-side heat exchanger outlet 1082, passes through the user-side heat exchanger outlet first pipe 141, and enters the second switching device 120 through the fourth port 1204. In the second switching device 120, the liquid refrigerant flows through the fourth valve pipe 404, passes through the fourth check valve 414 on the fourth valve pipe 404, and then flows out from the second switching device first port 1201. The liquid refrigerant flowing out from the second switching device first port 1201 flows through the throttling device 130 and becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness), then enters the second switching device 120 through the second port 1202. In the second switching device 120, the liquid refrigerant flows through a portion of the second valve line 402 and then enters the third valve line 403. After passing through the third check valve 413 on the third valve line 403, it flows out of the second switching device 120 from the fifth port 1205.

[0039] It should be noted that, since the pressure at the connection point C between the first valve line 401 and the fourth valve line 404 is higher than the pressure at the connection point A between the third valve line 403 and the first valve line 401, the refrigerant will not flow from the connection point A between the third valve line 403 and the first valve line 401 to the connection point C between the first valve line 401 and the fourth valve line 404.

[0040] It should also be noted that, since the pressure at the connection point E between the user-side heat exchanger inlet first pipe 143 and the user-side heat exchanger inlet second pipe 144 is higher than the pressure at the connection point B between the third valve pipe 403 and the second valve pipe 402, the refrigerant will not flow from the connection point E between the user-side heat exchanger inlet first pipe 143 and the user-side heat exchanger inlet second pipe 144 to the connection point B between the third valve pipe 403 and the second valve pipe 402.

[0041] Therefore, the air conditioning unit of the third embodiment of this application can also achieve high heat exchange efficiency of the user-side heat exchanger, and the pipe diameter of the pipe in the second switching device 120, which includes pipes and one-way valves, is small, as is the valve volume. In addition, the pipes and interfaces connected to the second switching device 120 are also small in size.

[0042] Figure 5 This is a system diagram of the air conditioning unit according to the fourth embodiment of this application. The similarities between the air conditioning unit of the fourth embodiment and the air conditioning unit of the first embodiment will not be repeated. The main difference between the air conditioning unit of the fourth embodiment and the air conditioning unit of the first embodiment is that the first switching device 110 of the air conditioning unit of the fourth embodiment further has a first switching device sixth port 501, and the second switching device 120 further has a second switching device sixth port 502.

[0043] like Figure 5 As shown, the sixth port 501 of the first switching device 110 is connected to the second port 1062 of the air-side heat exchanger, and the sixth port 502 of the second switching device is connected to the first port 1061 of the air-side heat exchanger. When the first switching device 110 is in the first switching device first state, the first switching device 1101 connects to the fifth port 1105, and the second port 1102 connects to the fourth port 1104. When the first switching device 110 is in the second switching device state, the first switching device 1101 connects to the third port 1103, and the second port 1102 connects to the sixth port 501. When the second switching device 120 is in the first state, it connects the first port 1201 to the fifth port 1205 and the second port 1202 to the third port 1203. When the second switching device 120 is in the second state, it connects the first port 1201 to the fourth port 1204 and the second port 1202 to the sixth port 502.

[0044] Specifically, the air conditioning unit of the fourth embodiment of this application further includes an additional first air-side heat exchanger pipe 512 and an additional second air-side heat exchanger pipe 514. The first air-side heat exchanger pipe 163 connects the fifth port 1105 of the first switching device to the first port 1061 of the air-side heat exchanger. One end of the additional first air-side heat exchanger pipe 512 is connected to the sixth port 502 of the second switching device, and the other end of the additional first air-side heat exchanger pipe 512 is connected to the first air-side heat exchanger pipe 163, thereby enabling communication between the sixth port 502 of the second switching device and the first port 1061 of the air-side heat exchanger. The second air-side heat exchanger pipe 164 connects the second port 1062 of the air-side heat exchanger to the fifth port 1205 of the second switching device. One end of the second additional pipe 514 of the air-side heat exchanger is connected to the sixth port 501 of the first switching device, and the other end of the second additional pipe 514 of the air-side heat exchanger is connected to the second pipe 164 of the air-side heat exchanger, thereby enabling the second port 1062 of the air-side heat exchanger to communicate with the sixth port 501 of the first switching device.

[0045] The user-side and air-side heat exchangers of the air conditioning unit disclosed in this application have high heat exchange efficiency because, regardless of whether it is in cooling or heating mode, the flow direction of the fluid on the user side is opposite to the flow direction of the refrigerant in the air conditioning unit, and the flow direction of the fluid (e.g., air) on the air side is also opposite to the flow direction of the refrigerant in the air conditioning unit, thus forming a counter-current flow. The counter-current user-side fluid and refrigerant can exchange heat more fully, and the counter-current air-side fluid and refrigerant can exchange heat more fully, thereby achieving high heat exchange efficiency without changing the internal structure of the heat exchangers.

[0046] Furthermore, the valve body of the second switching device 120 of the air conditioning unit of this application is small, and the pipes and interfaces are also small in size. Specifically, regardless of whether the air conditioning unit is in cooling mode or heating mode, the refrigerant flowing through the second switching device 120 of this application is liquid refrigerant. Since the density of liquid refrigerant is greater than that of gaseous refrigerant, the flow area of ​​the second switching device 120 of the air conditioning unit of this application is smaller when the air conditioning unit is under the same load (i.e., the same flow requirement). Therefore, the size of the valve body, pipes, and interfaces of the second switching device 120 is smaller than the volume and / or pipe diameter of the switching device that requires gaseous refrigerant to flow through.

[0047] The countercurrent flow between the user-side heat exchanger and the air-side heat exchanger of the air conditioning unit in the fourth embodiment of this application will refer to... Figures 6A-6B The air conditioning unit described herein is in conjunction with the fifth embodiment of this application.

[0048] Figure 6A This is a fluid flow diagram of the air conditioning unit in cooling mode according to the fifth embodiment of this application. Figure 6BThis is a fluid flow diagram of the air conditioning unit in heating mode according to the fifth embodiment of this application. Figures 6A-6B As shown, in the air conditioning unit of the fifth embodiment of this application, the first switching device 110 and the second switching device 120 are six-way valves. The connection of the six ports of the six-way valve is the same as that of the first switching device 110 and the second switching device 120 in the fourth embodiment of this application, and will not be described again here.

[0049] like Figure 6A As shown, the refrigerant is compressed into a high-temperature, high-pressure refrigerant in compressor 102. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flowing out of compressor outlet 1021 flows through first pipe 161, enters first switching device 110 through first port 1101, and flows out from first switching device fifth port 1105. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flows through first pipe 163 of air-side heat exchanger and enters air-side heat exchanger 106 through first port 1061. In air-side heat exchanger 106, the high-temperature, high-pressure refrigerant exchanges heat with a lower-temperature fluid on the air side, thereby becoming a high-temperature, high-pressure refrigerant (i.e., liquid refrigerant). Subsequently, the liquid refrigerant flows through second port 1062 of air-side heat exchanger, through second pipe 164 of air-side heat exchanger, enters second switching device 120 through second switching device fifth port 1205, and flows out from second switching device first port 1201. Liquid refrigerant, after passing through throttling device 130, becomes low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness). It then flows through sixth pipe 166 and enters second switching device 120 through second port 1202, exiting from third port 1203. Subsequently, the two-phase refrigerant with low dryness enters user-side heat exchanger 108 through user-side heat exchanger inlet first pipe 143. In user-side heat exchanger 108, the low-temperature, low-pressure refrigerant exchanges heat with the user-side fluid at a higher temperature, thereby lowering the temperature of the user-side fluid to provide the user with a lower-temperature fluid (e.g., for providing chilled water for air conditioning). After exchanging heat with the user-side fluid in user-side heat exchanger 108, the low-temperature, low-pressure refrigerant becomes low-temperature, low-pressure gaseous refrigerant. The gaseous refrigerant flowing from the user-side heat exchanger outlet 1082 flows through a portion of the user-side heat exchanger outlet first pipe 141 and the user-side heat exchanger outlet second pipe 142, then enters the first switching device 110 via the fourth port 1104 and exits from the first switching device second port 1102. Subsequently, the gaseous refrigerant re-enters the compressor 102 via the second pipe 162 and the compressor inlet 1022. This completes the refrigeration cycle.

[0050] like Figure 6BAs shown, the refrigerant is compressed into a high-temperature, high-pressure refrigerant in compressor 102. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flowing from compressor outlet 1021 flows through first pipe 161, enters first switching device 110 through first port 1101, and exits from first switching device third port 1103. The high-temperature, high-pressure refrigerant (i.e., gaseous refrigerant) flows through a portion of user-side heat exchanger inlet second pipe 144 and user-side heat exchanger inlet first pipe 143, and then enters user-side heat exchanger 108 through user-side heat exchanger inlet 1081. In user-side heat exchanger 108, the high-temperature, high-pressure refrigerant exchanges heat with a lower-temperature fluid on the user side, thereby raising the temperature of the user-side fluid to provide the user with a higher-temperature fluid (e.g., for providing hot water for air conditioning). After exchanging heat with the user-side fluid in user-side heat exchanger 108, the high-temperature, high-pressure refrigerant becomes a high-temperature, high-pressure refrigerant (i.e., liquid refrigerant). Subsequently, the liquid refrigerant flows out from the user-side heat exchanger outlet 1082, flows through the user-side heat exchanger outlet first pipe 141, enters the second switching device 120 through the second switching device fourth port 1204, and flows out from the second switching device first port 1201. After passing through the throttling device 130, the liquid refrigerant becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant with low dryness), flows through the sixth pipe 166, enters the second switching device 120 through the second switching device second port 1202, and flows out from the second switching device sixth port 502. Subsequently, the two-phase refrigerant with low dryness passes through the air-side heat exchanger additional first pipe 512 and a portion of the air-side heat exchanger first pipe 163, and enters the air-side heat exchanger 106 through the air-side heat exchanger first port 1061. After exchanging heat with the higher-temperature fluid on the air side in the air-side heat exchanger 106, the low-temperature, low-pressure refrigerant becomes a low-temperature, low-pressure gaseous refrigerant. Subsequently, the gaseous refrigerant passes through the second port 1062 of the air-side heat exchanger, flows through a portion of the second pipe 164 of the air-side heat exchanger and the additional second pipe 514 of the air-side heat exchanger, and then enters the first switching device 110 through the sixth port 501 of the first switching device, and exits from the second port 1102 of the first switching device. Then, the gaseous refrigerant re-enters the compressor 102 through the second pipe 162 and the compressor inlet 1022. This completes the heating cycle.

[0051] The air conditioning unit of the fifth embodiment of this application can also achieve high heat exchange efficiency of the user-side heat exchanger and the air-side heat exchanger. Furthermore, the valve body of the second switching device 120, which is a six-way valve, has a small volume, the interface size of the six-way valve is small, and the pipes and interfaces connected to the second switching device 120 are also small in size.

[0052] Figure 7A This is a system diagram of an air conditioning unit according to the sixth embodiment of this application. Figure 7AThe first switching device 110 in the air conditioning unit of the sixth embodiment shown is a six-way valve. The connection of the six ports of the six-way valve is the same as that of the first switching device 110 in the fifth embodiment of this application, and will not be described again here. The second switching device 120 includes several pipes and valves, which are referred to below. Figure 7A Introduction: like Figure 7A As shown, the second switching device 120 includes a fifth valve line 701, a sixth valve line 702, a seventh valve line 703, and an eighth valve line 704. The fifth valve line 701 is configured to allow refrigerant to flow unidirectionally from the fifth port 1205 of the second switching device to the first port 1201 of the second switching device. The sixth valve line 702 is configured to allow refrigerant to flow unidirectionally from the second port 1202 of the second switching device to the third port 1203 of the second switching device. The seventh valve line 703 is configured to allow refrigerant to flow unidirectionally from the second port 1202 of the second switching device to the sixth port 502 of the second switching device. The eighth valve line 704 is configured to allow refrigerant to flow unidirectionally from the fourth port 1204 of the second switching device to the first port 1201 of the second switching device. More specifically, the eighth valve line 704 connects the first port 1201 of the second switching device and the fourth port 1204 of the second switching device. The sixth valve pipe 702 connects to the second port 1202 and the third port 1203 of the second switching device. One end of the seventh valve pipe 703 connects to the sixth port 502 of the second switching device, and the other end of the seventh valve pipe 703 connects to the sixth valve pipe 702, thereby connecting the second port 1202 and the sixth port 502 of the second switching device. One end of the fifth valve pipe 701 connects to the fifth port 1205 of the second switching device, and the other end of the fifth valve pipe 701 connects to the eighth valve pipe 704, thereby connecting the fifth port 1205 and the first port 1201 of the second switching device.

[0053] In the sixth embodiment of this application, the second switching device 120 further includes a fifth one-way valve 711, a sixth one-way valve 712, a seventh one-way valve 713, and an eighth one-way valve 714. The fifth one-way valve 711 is disposed on the fifth valve line 701 and configured to allow fluid in the fifth valve line 701 to flow unidirectionally from the fifth port 1205 of the second switching device to the first port 1201 of the second switching device. The sixth one-way valve 712 is disposed on the sixth valve line 702 and configured to allow fluid in the sixth valve line 702 to flow unidirectionally from the second port 1202 of the second switching device to the third port 1203 of the second switching device. The seventh one-way valve 713 is disposed on the seventh valve line 703 and configured to allow fluid in the seventh valve line 703 to flow unidirectionally from the second port 1202 of the second switching device to the sixth port 502 of the second switching device. The eighth check valve 714 is installed on the eighth valve line 704 and is configured to allow the fluid in the eighth valve line 704 to flow unidirectionally from the fourth port 1204 of the second switching device to the first port 1201 of the second switching device.

[0054] Figure 7B yes Figure 7A The diagram shows the fluid flow direction of the air conditioning unit in cooling mode. Figure 7B The direction of refrigerant flow and Figure 6A The same flow direction of the refrigerant in the middle section will not be described again. For example... Figure 7B As shown, the gaseous refrigerant exchanges heat with a cooler fluid on the air side in the air-side heat exchanger 106, thus becoming a high-temperature, high-pressure refrigerant (i.e., a liquid refrigerant). Subsequently, the liquid refrigerant flows through the second pipe 164 of the air-side heat exchanger and enters the second switching device 120 through the fifth port 1205. In the second switching device 120, the liquid refrigerant enters the fifth valve pipe 701, passes through the fifth check valve 711 on the fifth valve pipe 701, then passes through a portion of the eighth valve pipe 704, and subsequently flows out from the first port 1201 of the second switching device. The liquid refrigerant flowing out from the first port 1201 of the second switching device flows through the throttling device 130 and becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant), then enters the second switching device 120 through the second port 1202. In the second switching device 120, the two-phase refrigerant with a lower dryness flows through the sixth valve line 702, and after passing through the sixth one-way valve 712 on the sixth valve line 702, it flows out of the second switching device 120 from the third port 1203.

[0055] It should be noted that, since the pressure at the connection point C between the fifth valve line 701 and the eighth valve line 704 is higher than the pressure at the connection point D between the user-side heat exchanger outlet first line 141 and the user-side heat exchanger outlet second line 142, the refrigerant will not flow from the connection point D between the user-side heat exchanger outlet first line 141 and the user-side heat exchanger outlet second line 142 to the connection point C between the fifth valve line 701 and the eighth valve line 704.

[0056] It should also be noted that, since the pressure at the connection point M between the first air-side heat exchanger pipe 163 and the additional first air-side heat exchanger pipe 512 is higher than the pressure at the connection point B between the sixth valve pipe 702 and the seventh valve pipe 703, the refrigerant will not flow from the connection point B between the sixth valve pipe 702 and the seventh valve pipe 703 to the connection point M between the first air-side heat exchanger pipe 163 and the additional first air-side heat exchanger pipe 512.

[0057] Figure 7C yes Figure 7A The diagram shows the fluid flow direction of the air conditioning unit in heating mode. Figure 4C The direction of refrigerant flow and Figure 6B The same flow direction of the refrigerant in the middle section will not be described again. For example... Figure 7C As shown, the gaseous refrigerant exchanges heat with a lower-temperature fluid on the user side in the user-side heat exchanger 108, transforming into a high-temperature, high-pressure refrigerant (i.e., a liquid refrigerant). Subsequently, the liquid refrigerant flows out from the user-side heat exchanger outlet 1082, passes through the user-side heat exchanger outlet first pipe 141, and enters the second switching device 120 through the fourth port 1204. In the second switching device 120, the liquid refrigerant flows through the eighth valve pipe 704, passes through the eighth check valve 714 on the eighth valve pipe 704, and exits from the first port of the second switching device. 1201 Outflow. The liquid refrigerant flowing out of the first port 1201 of the second switching device flows through the throttling device 130 and becomes a low-temperature, low-pressure refrigerant (i.e., a two-phase refrigerant), and then enters the second switching device 120 through the second port 1202. In the second switching device 120, the two-phase refrigerant with lower dryness flows through a portion of the sixth valve line 702 and then enters the seventh valve line 703. After passing through the seventh one-way valve 713 on the seventh valve line 703, it flows out of the second switching device 120 through the sixth port 502.

[0058] It should be noted that, since the pressure at the connection point E between the user-side heat exchanger inlet first pipe 143 and the user-side heat exchanger inlet second pipe 144 is higher than the pressure at the connection point B between the sixth valve pipe 702 and the seventh valve pipe 703, the refrigerant will not flow from the connection point B between the sixth valve pipe 702 and the seventh valve pipe 703 to the connection point E between the user-side heat exchanger inlet first pipe 143 and the user-side heat exchanger inlet second pipe 144.

[0059] It should also be noted that, since the pressure at the connection point C between the fifth valve line 701 and the eighth valve line 704 is higher than the pressure at the connection point N between the air-side heat exchanger auxiliary second line 514 and the air-side heat exchanger second line 164, the refrigerant will not flow from the connection point N between the air-side heat exchanger auxiliary second line 514 and the air-side heat exchanger second line 164 to the connection point C between the fifth valve line 701 and the eighth valve line 704.

[0060] Therefore, the air conditioning unit of the sixth embodiment of this application can also achieve high heat exchange efficiency of the user-side heat exchanger and the air-side heat exchanger, and the pipe diameter of the pipe in the second switching device 120, which includes pipes and one-way valves, is small, and the valve volume is small. In addition, the pipes and interfaces connected to the second switching device 120 are also small in size.

[0061] It should be noted that, in this application, one embodiment of the second switching device 120 includes a pipeline and a check valve. Those skilled in the art will understand that, in other embodiments, the second switching device 120 can also be implemented by valves and pipelines such as solenoid valves and switching valves.

[0062] In this application, the first switching device 110 and the second switching device 120 are configured to switch synchronously. For example, the first switching device 110 and the second switching device 120, both including a five-way valve / six-way valve, include a housing and a rotatable valve body. The first switching device 110 and the second switching device 120 can achieve synchronous switching by driving the valve body to rotate via a coaxial motor. As another example, the first switching device 110 and the second switching device 120, both including a five-way valve / six-way valve, include a housing and a slidable valve body. The first switching device 110 and the second switching device 120 can achieve synchronous switching by driving the valve body to slide pneumatically (i.e., by the pressure difference of the gas on both sides of the valve body). Furthermore, both the first switching device 110 and the second switching device 120 can be communicatively connected to a control device. The control device controls the state switching of the first switching device 110 and the second switching device 120 by sending signals.

[0063] Although this disclosure has been described in conjunction with examples of the embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary and not limiting; therefore, the disclosures herein may be used to solve other technical problems and have other technical effects and / or can solve other technical problems. Accordingly, the examples of embodiments of this disclosure as set forth above are intended to be illustrative and not limiting. Various changes may be made without departing from the spirit or scope of this disclosure. Therefore, this disclosure is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents.

Claims

1. An air conditioning unit, characterized in that, The air conditioning unit includes: The compressor (102) has a compressor outlet (1021) and a compressor inlet (1022). An air-side heat exchanger (106) has an air-side heat exchanger first port (1061) and an air-side heat exchanger second port (1062). User-side heat exchanger (108), the user-side heat exchanger (108) having a user-side heat exchanger inlet (1081) and a user-side heat exchanger outlet (1082). A throttling device (130) having a throttling device inlet (1301) and a throttling device outlet (1302). A first switching device (110) has a first switching device first port (1101), a first switching device second port (1102), a first switching device third port (1103), a first switching device fourth port (1104), and a first switching device fifth port (1105). The first switching device first port (1101) is connected to the compressor outlet (1021), the first switching device second port (1102) is connected to the compressor inlet (1022), the first switching device third port (1103) is connected to the user-side heat exchanger inlet (1081), the first switching device fourth port (1104) is connected to the user-side heat exchanger outlet (1082), and the first switching device fifth port (1105) is connected to the air-side heat exchanger first port (1061). The second switching device (120) has a first port (1201), a second port (1202), a third port (1203), a fourth port (1204), and a fifth port (1205). The first port (1201) is connected to the inlet (1301) of the throttling device, the second port (1202) is connected to the outlet (1302) of the throttling device, the third port (1203) is connected to the inlet (1081) of the user-side heat exchanger, the fourth port (1204) is connected to the outlet (1082) of the user-side heat exchanger, and the fifth port (1205) is connected to the second port (1062) of the air-side heat exchanger. The air conditioning unit has a cooling mode and a heating mode. The first switching device (110) has a first switching device first state and a first switching device second state. The second switching device (120) has a second switching device first state and a second switching device second state. When the air conditioning unit is in the cooling mode, the first switching device (110) is in the first switching device first state and the second switching device (120) is in the second switching device first state. The gaseous refrigerant leaving the compressor (102) flows as liquid refrigerant through the air-side heat exchanger (106) and then through the second switching device (120). After flowing through the throttling device (130), the refrigerant enters the user-side heat exchanger (108) from the user-side heat exchanger inlet (1081) and then flows out from the user-side heat exchanger outlet (1082). When the air conditioning unit is in the heating mode, the first switching device (110) is in the first switching device second state and the second switching device (120) is in the second switching device second state. The gaseous refrigerant leaving the compressor (102) enters the user-side heat exchanger (108) through the user-side heat exchanger inlet (1081) and becomes liquid refrigerant, which flows out from the user-side heat exchanger outlet (1082). The liquid refrigerant flows through the second switching device (120).

2. The air conditioning unit according to claim 1, characterized in that: When the first switching device (110) is in the first switching device first state, the first switching device (110) connects the first port (1101) of the first switching device with the fifth port (1105) of the first switching device, and connects the second port (1102) of the first switching device with the fourth port (1104) of the first switching device. When the first switching device (110) is in the second state of the first switching device, the first switching device (110) connects the first port (1101) of the first switching device to the third port (1103) of the first switching device, and connects the second port (1102) of the first switching device to the fifth port (1105) of the first switching device. When the second switching device (120) is in the first state, the second switching device (120) connects the first port (1201) of the second switching device to the fifth port (1205) of the second switching device, and connects the second port (1202) of the second switching device to the third port (1203) of the second switching device; and When the second switching device (120) is in the second switching device second state, the second switching device (120) connects the first port (1201) of the second switching device with the fourth port (1204) of the second switching device, and connects the second port (1202) of the second switching device with the fifth port (1205) of the second switching device.

3. The air conditioning unit according to claim 1, characterized in that, The air conditioning unit also includes: The first outlet pipe (141) of the user-side heat exchanger is connected to the fourth port (1204) of the second switching device and the outlet (1082) of the user-side heat exchanger. The second outlet pipe (142) of the user-side heat exchanger is connected at one end to the fourth port (1104) of the first switching device, and at the other end to the first outlet pipe (141) of the user-side heat exchanger, thereby enabling the fourth port (1104) of the first switching device to communicate with the outlet (1082) of the user-side heat exchanger. The user-side heat exchanger inlet first pipe (143) is connected to the second switching device third port (1203) and the user-side heat exchanger inlet (1081); and The second inlet pipe (144) of the user-side heat exchanger is connected at one end to the third port (1103) of the first switching device, and at the other end to the first inlet pipe (143) of the user-side heat exchanger, thereby enabling the third port (1103) of the first switching device to communicate with the inlet (1081) of the user-side heat exchanger.

4. The air conditioning unit according to claim 3, characterized in that: The first switching device (110) and the second switching device (120) are five-way valves.

5. The air conditioning unit according to claim 3, characterized in that: The first switching device (110) is a five-way valve; The second switching device (120) includes a first valve line (401), a second valve line (402), a third valve line (403) and a fourth valve line (404). The first valve line (401) is configured to allow refrigerant to flow unidirectionally from the fifth port (1205) of the second switching device to the first port (1201) of the second switching device, the second valve line (402) is configured to allow refrigerant to flow unidirectionally from the second port (1202) of the second switching device to the third port (1203) of the second switching device, the third valve line (403) is configured to allow refrigerant to flow unidirectionally from the second port (1202) of the second switching device to the fifth port (1205) of the second switching device, and the fourth valve line (404) is configured to allow refrigerant to flow unidirectionally from the fourth port (1204) of the second switching device to the first port (1201) of the second switching device.

6. The air conditioning unit according to claim 3, characterized in that: The first switching device (110) also has a sixth port (501) of the first switching device, which is connected to the second port (1062) of the air-side heat exchanger; The second switching device (120) also has a second switching device sixth port (502), which is connected to the first port (1061) of the air-side heat exchanger; When the first switching device (110) is in the first switching device first state, the first switching device (110) connects the first port (1101) of the first switching device with the fifth port (1105) of the first switching device, and connects the second port (1102) of the first switching device with the fourth port (1104) of the first switching device. When the first switching device (110) is in the second state of the first switching device, the first switching device (110) connects the first port (1101) of the first switching device to the third port (1103) of the first switching device, and connects the second port (1102) of the first switching device to the sixth port (501) of the first switching device; When the second switching device (120) is in the first state of the second switching device, the second switching device (120) connects the first port (1201) of the second switching device with the fifth port (1205) of the second switching device, and connects the second port (1202) of the second switching device with the third port (1203) of the second switching device; When the second switching device (120) is in the second switching device second state, the second switching device (120) connects the first port (1201) of the second switching device with the fourth port (1204) of the second switching device, and connects the second port (1202) of the second switching device with the sixth port (502) of the second switching device.

7. The air conditioning unit according to claim 6, characterized in that, The air conditioning unit also includes: The first air-side heat exchanger pipeline (163) is connected to the fifth port (1105) of the first switching device and the first port (1061) of the air-side heat exchanger. An air-side heat exchanger is provided with an additional first pipe (512), one end of which is connected to the sixth port (502) of the second switching device, and the other end of which is connected to the first pipe (163) of the air-side heat exchanger, thereby enabling the sixth port (502) of the second switching device to communicate with the first port (1061) of the air-side heat exchanger. The second air-side heat exchanger pipe (164) connects the second port (1062) of the air-side heat exchanger to the fifth port (1205) of the second switching device; and An additional second pipe (514) is provided for the air-side heat exchanger. One end of the additional second pipe (514) is connected to the sixth port (501) of the first switching device, and the other end is connected to the second pipe (164) of the air-side heat exchanger, thereby enabling the second port (1062) of the air-side heat exchanger to communicate with the sixth port (501) of the first switching device.

8. The air conditioning unit according to claim 7, characterized in that: The first switching device (110) and the second switching device (120) are six-way valves.

9. The air conditioning unit according to claim 7, characterized in that: The first switching device (110) is a six-way valve; The second switching device (120) includes a fifth valve line (701), a sixth valve line (702), a seventh valve line (703) and an eighth valve line (704). The fifth valve line (701) is configured to allow refrigerant to flow unidirectionally from the fifth port (1205) of the second switching device to the first port (1201) of the second switching device. The sixth valve line (702) is configured to allow refrigerant to flow unidirectionally from the second port (1202) of the second switching device to the third port (1203) of the second switching device. The seventh valve line (703) is configured to allow refrigerant to flow unidirectionally from the second port (1202) of the second switching device to the sixth port (502) of the second switching device. The eighth valve line (704) is configured to allow refrigerant to flow unidirectionally from the fourth port (1204) of the second switching device to the first port (1201) of the second switching device.

10. The air conditioning unit according to claim 1, characterized in that: The first switching device (110) and the second switching device (120) are configured to switch synchronously.

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