Refrigerant switching assembly and heating, ventilation and air conditioning device

Abstract

The present application discloses a refrigerant switching assembly and a heating, ventilation and air conditioning device. The refrigerant switching assembly provided in the present application comprises a four-way valve and system piping. The four-way valve comprises a valve body and four valve connecting pipes, wherein the valve body comprises four valve ports, the four valve connecting pipes are arranged in one-to-one correspondence to the four valve ports, and the valve connecting pipes are connected to the valve body. At least one valve connecting pipe comprises a connecting pipe body, a first copper sleeve, and an extension pipe which are connected in sequence, wherein the connecting pipe body is connected to the valve body, the extension pipe is connected to the system piping, the connecting pipe body is made of stainless steel, and the extension pipe is made of copper; and the system piping is made of copper, or the system piping is made of stainless steel, a second copper sleeve is provided on the system piping, and the second copper sleeve is connected to the extension pipe.

Description

Refrigerant switching components and HVAC equipment

[0001] This application claims priority to Chinese Patent Application No. 202510013094.4, filed on January 3, 2025, entitled "Refrigerant Switching Component and HVAC Equipment", and to Chinese Patent Application No. 202520016960.0, entitled "Refrigerant Switching Component and HVAC Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of air conditioning technology, and in particular to a refrigerant switching component and a heating, ventilation and air conditioning (HVAC) device using the refrigerant switching component. Background Technology

[0003] The main function of the four-way valve in an air conditioning system is to switch the direction of refrigerant flow so that the air conditioning system can operate in different modes.

[0004] In related technologies, during the welding process between the refrigerant transfer pipe and the four-way valve, the electrical components of the four-way valve (such as the pilot valve) are exposed to high ambient temperatures. Furthermore, welding sparks may splatter onto these electrical components. This can affect the performance of the four-way valve, and consequently, the operation of the air conditioning system. Summary of the Invention

[0005] The main objective of this application is to provide a refrigerant switching component and HVAC equipment that can improve the performance of a four-way valve, thereby enhancing the operational stability of the air conditioning system.

[0006] On one hand, this application provides a refrigerant switching component, including a four-way valve and system piping; the four-way valve includes a valve body and four valve connectors, the valve body has four valve ports, the four valve connectors are configured one-to-one with the four valve ports, and the valve connectors are connected to the valve body; wherein, at least one valve connector includes a connector body, a first copper sleeve and an extension pipe connected in sequence, the connector body is connected to the valve body, the extension pipe is connected to the system piping, the connector body is made of stainless steel, and the extension pipe is made of copper; the system piping is made of copper, or the system piping is made of stainless steel, and the system piping is equipped with a second copper sleeve, the second copper sleeve being connected to the extension pipe.

[0007] As an optional implementation, the extension pipe has a first mating end and a second mating end that are disposed opposite to each other; a first copper sleeve is fitted on the outside of the first mating end and connected to the first mating end, and the second mating end is connected to the system piping.

[0008] As an alternative implementation, the system piping is made of copper.

[0009] As an optional implementation, the second mating end is sleeved on the outside of the system piping and connected to the system piping.

[0010] As an alternative implementation, the system piping is made of stainless steel and is equipped with a second copper sleeve.

[0011] As an optional implementation, the second copper sleeve is fitted onto the outside of the second mating end and connected to the second mating end.

[0012] As an optional implementation, the pipe body has a first connector end and a second connector end that are disposed opposite to each other, and the first connector end is connected to the valve body.

[0013] As an optional implementation, the first copper sleeve is fitted onto the outside of the second connector end and connected to the second connector end.

[0014] As an optional implementation, the second connector end is sleeved on the outside of the first copper sleeve and connected to the first copper sleeve.

[0015] As an optional implementation, the connector body is a straight pipe.

[0016] As an optional implementation, the pipe body includes a first straight pipe section, a first transition pipe section and a second straight pipe section connected in sequence. The first straight pipe section has a first connector end and the second straight pipe section has a second connector end. The inner diameter of the first straight pipe section is greater than or less than the inner diameter of the second straight pipe section.

[0017] As an alternative implementation, the extension tube is a one-piece structure.

[0018] As an optional implementation, the extension tube is a straight tube.

[0019] As an optional implementation, the extension pipe includes a third straight pipe section, a second transition pipe section, and a fourth straight pipe section connected in sequence, wherein the inner diameter of the third straight pipe section is greater than or less than the inner diameter of the fourth straight pipe section.

[0020] As an optional implementation, the end of the third straight pipe section away from the second transition pipe section forms a first mating end, which is connected to the first copper sleeve.

[0021] As an optional implementation, the end of the fourth straight pipe section furthest from the second transition pipe section forms a second docking end, which is connected to the system piping.

[0022] As an optional implementation, the extension pipe includes a first connecting pipe and a second connecting pipe connected together; the first end of the first connecting pipe forms a first mating end, which is connected to a first copper sleeve; the first end of the second connecting pipe forms a second mating end, which is connected to the system piping; and the second end of the first connecting pipe and the second end of the second connecting pipe are inserted into each other.

[0023] As an optional implementation, the first connecting pipe is a straight pipe.

[0024] As an optional implementation, the first connecting pipe includes a first DC connecting pipe segment, a first transition connecting pipe segment, and a second DC connecting pipe segment connected in sequence. The inner diameter of the first DC connecting pipe segment is greater than or less than the inner diameter of the second DC connecting pipe segment. The end of the first DC connecting pipe segment away from the first transition connecting pipe segment is formed as a first mating end, and the end of the second DC connecting pipe segment away from the first transition connecting pipe segment is inserted into the second end of the second connecting pipe.

[0025] As an optional implementation, the second connecting pipe is a straight pipe.

[0026] As an optional implementation, the second connecting pipe includes a third DC connecting pipe segment, a second transition connecting pipe segment, and a fourth DC connecting pipe segment connected in sequence. The inner diameter of the third DC connecting pipe segment is greater than or less than the inner diameter of the fourth DC connecting pipe segment. The end of the third DC connecting pipe segment away from the second transition connecting pipe segment is inserted into the second end of the first connecting pipe, and the end of the fourth DC connecting pipe segment away from the second transition connecting pipe segment forms a second mating end.

[0027] As an optional implementation, the extension tube has a first mating end and a second mating end that are disposed opposite to each other; the first mating end is welded to the first copper sleeve by a first solder, and the second mating end is welded to the system piping by a second solder.

[0028] As an optional implementation, the melting point of the first solder is greater than or equal to the melting point of the second solder.

[0029] As an alternative implementation, the system piping is made of stainless steel and is equipped with a second copper sleeve.

[0030] As an optional implementation, the extension tube includes a first connecting tube and a second connecting tube, the first end of the first connecting tube forming a first mating end, the first end of the second connecting tube forming a second mating end, and the second end of the first connecting tube being inserted into the second end of the second connecting tube.

[0031] As an optional implementation, the second end of the first connecting tube is welded to the second end of the second connecting tube by a third solder, wherein the melting point of the first solder and the melting point of the second solder are both greater than the melting point of the third solder.

[0032] As an alternative implementation, the third solder is formed by melting a solder ring embedded in the first or second connecting tube.

[0033] As an optional implementation, a first radial gap is provided between the first mating end and the first copper sleeve in the radial direction of the first mating end for allowing the first solder to flow in.

[0034] As an optional implementation, the first mating end or the first copper sleeve is provided with a textured structure located in the first radial gap.

[0035] As an optional implementation, a second radial gap is provided between the second mating end and the system piping for the flow of the second solder in the radial direction of the second mating end.

[0036] As an optional implementation, the second mating end or system piping is provided with a textured structure located in the second radial gap.

[0037] As an alternative implementation, the extension tube is welded to the first copper sleeve using an in-furnace welding process or a high-frequency welding process.

[0038] As an optional implementation, the insertion length between the extension pipe and the system piping is L, where 15 mm ≤ L ≤ 20 mm.

[0039] As an optional implementation, the four-way valve also includes a connector; one end of the connector is inserted into the corresponding valve port and connected to the valve body, and the second end of the connector is welded to the valve connecting pipe.

[0040] As an alternative implementation, the connector and valve fitting are made of the same material.

[0041] As an optional implementation, the second end of the connector is plugged into or docked with the valve connector.

[0042] On the other hand, this application provides a heating and ventilation equipment, including a gas-liquid separator, a shut-off valve, an outdoor unit heat exchanger, and the aforementioned refrigerant switching assembly; wherein, the four valve connections include a first valve connection, a second valve connection, and a third valve connection arranged side by side, the first valve connection being connected to the gas-liquid separator through a first system piping, the second valve connection being connected to the shut-off valve through a second system piping, and the third valve connection being connected to the outdoor unit heat exchanger through a third system piping.

[0043] In the refrigerant switching assembly and HVAC equipment of this application embodiment, by setting an extension pipe on the valve connector of the four-way valve so that the extension pipe is connected to the system piping, on the one hand, the distance between the welding position between the extension pipe and the system piping and the electrical components is increased. In this way, compared with related technologies, the ambient temperature at the location of the electrical components can be reduced, the performance of the electrical components can be improved, and thus the performance of the four-way valve can be improved. On the other hand, by setting the extension pipe, the sparks during the welding process can be prevented from splashing onto the electrical components to a certain extent, which can also improve the performance of the electrical components and further improve the performance of the four-way valve. Attached Figure Description

[0044] Figure 1 is a schematic diagram of the first partial structure of the HVAC equipment provided in an embodiment of this application;

[0045] Figure 2 is a magnified schematic diagram of the local structure at point A in Figure 1;

[0046] Figure 3 is a schematic diagram of the first structure of the valve pipe connection and system piping in the refrigerant switching component provided in the embodiment of this application;

[0047] Figure 4 is a schematic diagram of the second structure of the valve pipe connection and system piping in the refrigerant switching component provided in the embodiment of this application;

[0048] Figure 5 is a schematic diagram of the third structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0049] Figure 6 is a schematic diagram of the fourth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0050] Figure 7 is a schematic diagram of the fifth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0051] Figure 8 is a schematic diagram of the sixth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0052] Figure 9 is a schematic diagram of the seventh structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0053] Figure 10 is a schematic diagram of the eighth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0054] Figure 11 is a schematic diagram of the ninth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0055] Figure 12 is a schematic diagram of the tenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0056] Figure 13 is a schematic diagram of the eleventh structural connection between the valve pipe and the system piping in the refrigerant switching assembly provided in the embodiment of this application;

[0057] Figure 14 is a schematic diagram of the twelfth structural connection between the valve pipe and the system piping in the refrigerant switching assembly provided in the embodiment of this application;

[0058] Figure 15 is a schematic diagram of the thirteenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0059] Figure 16 is a schematic diagram of the fourteenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0060] Figure 17 is a schematic diagram of the fifteenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0061] Figure 18 is a schematic diagram of the sixteenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in the embodiment of this application;

[0062] Figure 19 is a schematic diagram of the seventeenth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment;

[0063] Figure 20 is a partial structural schematic diagram of the four-way valve in the refrigerant switching assembly provided in the embodiment of this application;

[0064] Figure 21 is a schematic diagram of the second partial structure of the HVAC equipment provided in the embodiment of this application;

[0065] Figure 22 is a structural schematic diagram of the HVAC equipment provided in an embodiment of this application;

[0066] Figure 23 is a diagram showing the refrigerant flow direction of the HVAC equipment provided in the embodiment of this application during cooling;

[0067] Figure 24 is a diagram showing the refrigerant flow direction of the heating and ventilation equipment provided in the embodiment of this application during heating.

[0068] Explanation of reference numerals in the attached drawings: 1. Four-way valve; 2. System piping; 3. Second copper sleeve; 4. First solder; 5. Second solder; 6. Third solder; 7. Weld ring; 8. First radial clearance; 9. First textured structure; 11. Valve body; 12. Valve connector; 13. Joint; 2a. First system piping; 2b. Second system piping; 2c. Third system piping; 2d. Fourth system piping; 10. Second radial clearance; 20. Compressor; 30. Oil separator; 40. Gas-liquid separator; 60. Outdoor unit heat exchanger; 70. Filter; 80. Electronic expansion valve; 90. Refrigerant heat dissipation device; 111. Valve port; 12a. First valve connector; 12b. Second valve connector; 12c. Third valve connector; 12d. Fourth valve connector; 121. Connector body; 122. First copper sleeve; 123. Extension pipe; 100. Indoor unit; 110. Electrical components; 1211, First connector end; 1212, Second connector end; 1213, First straight pipe section; 1214, First transition pipe section; 1215, Second straight pipe section; 1231, First mating end; 1232, Second mating end; 1233, Third straight pipe section; 1234, Second transition pipe section; 1235, Fourth straight pipe section; 1236, First connecting pipe; 1237, Second connecting pipe; 1238, First DC connecting pipe section; 1239, First transition connecting pipe section; 1240, Second DC connecting pipe section; 1241, Third DC connecting pipe section; 1242, Second transition connecting pipe section; 1243, Fourth DC connecting pipe section. Detailed Implementation

[0069] In related technologies, the refrigerant transfer pipe is welded to the valve connector of the four-way valve. The welding position is close to the electrical components inside the four-way valve. At this time, during the welding process, on the one hand, the ambient temperature of the electrical components (pilot valve, etc.) of the four-way valve is high, and on the other hand, welding sparks may splash onto the electrical components.

[0070] Understandably, higher surface temperatures of electrical components can lead to problems such as increased refrigerant temperature, malfunctioning four-way valves, and system pressure fluctuations. This not only directly affects the performance and lifespan of the electrical components themselves, thus impacting the performance and lifespan of the four-way valve, but also indirectly affects the overall performance and reliability of the air conditioning system through increased refrigerant temperature and malfunctioning four-way valves.

[0071] Therefore, this application provides a refrigerant switching component and HVAC equipment. When welding the transmission pipe and the valve connecting pipe of the four-way valve, on the one hand, it can avoid the high temperature of the electrical components to a certain extent, and on the other hand, it can avoid welding sparks from splashing onto the electrical components to a certain extent.

[0072] The embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation details.

[0073] Please refer to Figures 1 to 4. Figure 1 is a schematic diagram of the first partial structure of the HVAC equipment provided in the embodiment of this application. Figure 2 is an enlarged schematic diagram of the partial structure at point A in Figure 1. Figure 3 is a schematic diagram of the first structure of the valve pipe connection and system piping in the refrigerant switching assembly provided in the embodiment of this application. Figure 4 is a schematic diagram of the second structure of the valve pipe connection and system piping in the refrigerant switching assembly provided in the embodiment of this application. As shown in the figure, this embodiment provides a refrigerant switching component, including a four-way valve 1 and a system piping 2. The four-way valve 1 includes a valve body 11 and four valve connectors 12. The valve body 11 has four valve ports 111, and the four valve connectors 12 are arranged one-to-one with the four valve ports 111, and the valve connectors 12 are connected to the valve body 11. At least one valve connector 12 includes a connector body 121, a first copper sleeve 122, and an extension pipe 123. The connector body 121, the first copper sleeve 122, and the extension pipe 123 are connected in sequence. The connector body 121 is connected to the valve body 11, and the extension pipe 123 is connected to the system piping 2. The connector body 121 is made of stainless steel, and the extension pipe 123 is made of copper.

[0074] It should be noted that, in this embodiment, the pipe body 121 and the valve body 11, the pipe body 121 and the first copper sleeve 122, the first copper sleeve 122 and the extension pipe 123, and the extension pipe 123 and the system piping 2 can all be connected together by welding.

[0075] The system piping 2 can be made of two materials: copper or stainless steel. As mentioned above, the extension pipe 123 is made of copper. Since the extension pipe 123 needs to be connected to the system piping, the structure of the system piping 2 connected to the extension pipe 123 should also be made of copper. This is to reduce the welding difficulty between the extension pipe 123 and the system piping 2, and to increase the strength of the connection between the extension pipe 123 and the system piping 2.

[0076] Therefore, in some embodiments, when the system piping 2 is made of stainless steel, a second copper sleeve 3 can be fitted onto the system piping 2, and the second copper sleeve 3 is connected to the extension pipe 123. In this way, since the extension pipe 123 is made of copper, the material of the structure on the system piping 2 welded to the extension pipe 123 is also copper, namely the second copper sleeve 3. This reduces the welding process while increasing the structural strength of the weld between the extension pipe 123 and the system piping 2.

[0077] In the refrigerant switching assembly provided in this embodiment, the distance between the welding position of the extension pipe 123 and the system piping 2 and the electrical component 110 is increased by setting an extension pipe 123. This reduces the ambient temperature at the location of the electrical component 110 compared to related technologies, improving its performance and extending its service life, thereby improving the performance and service life of the four-way valve 1. Furthermore, the extension pipe 123 helps to prevent sparks from the welding process from splashing onto the electrical component 110. This also improves the performance of the electrical component 110, further enhancing the performance of the four-way valve 1.

[0078] It should be noted that the electrical component 110 here can be a mover.

[0079] In some specific embodiments, to achieve the connection between the extension pipe 123 and the first copper sleeve 122, and the connection between the extension pipe 123 and the system piping 2, the extension pipe 123 has a first mating end 1231 and a second mating end 1232, which are arranged opposite to each other; the first copper sleeve 122 is sleeved on the outside of the first mating end 1231 and connected to the first mating end 1231, and the second mating end 1232 is connected to the system piping 2. The specific connection method between the second mating end 1232 and the system piping 2 can be one of the following two, determined based on the material of the system piping 2.

[0080] As shown in Figure 3, in some embodiments, the system piping 2 is made of copper; the second mating end 1232 is sleeved on the outside of the system piping 2 and connected to the system piping 2. Of course, in some other embodiments, the system piping 2 may also be sleeved on the outside of the second mating end 1232 and connected to the second mating end 1232.

[0081] As shown in Figure 4, in some embodiments, the system piping 2 is made of stainless steel and is equipped with a second copper sleeve 3; the second copper sleeve 3 is fitted over the outside of the second mating end 1232 and is connected to the second mating end 1232. Of course, in some other embodiments, the second mating end 1232 may also be fitted over the outside of the second copper sleeve 3 and is connected to the second copper sleeve 3.

[0082] It should be noted that the connection method between system piping 2 and the second copper sleeve 3 can be either that system piping 2 is fitted onto the outside of the second copper sleeve 3, or that the second copper sleeve 3 is fitted onto the outside of system piping 2. No specific restrictions are placed on the connection method between system piping 2 and the second copper sleeve 3.

[0083] Furthermore, the pipe body 121 has a first connector end 1211 and a second connector end 1212, which are arranged opposite to each other. The first connector end 1211 is connected to the valve body 11, and the second connector end 1212 is connected to the first copper sleeve 122.

[0084] The connection between the second connector end 1212 and the first copper sleeve 122 can be one of the following two methods.

[0085] Specifically, as shown in Figure 3, in some embodiments, the second connector end 1212 is sleeved on the outside of the first copper sleeve 122, and the second connector end 1212 is connected to the first copper sleeve 122. As shown in Figure 4, in other embodiments, the first copper sleeve 122 is sleeved on the outside of the second connector end 1212, and the first copper sleeve 122 is connected to the second connector end 1212. Here, the connection method between the second connector end 1212 and the first copper sleeve 122 is not specifically limited.

[0086] In addition, the shape of the connector body 121 can be one of the following three types.

[0087] Specifically, in some embodiments, the connector body 121 is a straight tube. That is, the inner diameter and outer diameter of the connector body 121 are equal everywhere, and the connector body 121 extends in a straight line.

[0088] Please refer to Figures 5 and 6. Figure 5 is a schematic diagram of the third structure of the valve connection and system piping connection in the refrigerant switching component provided in this application embodiment. Figure 6 is a schematic diagram of the fourth structure of the valve connection and system piping connection in the refrigerant switching component provided in this application embodiment.

[0089] As shown in Figures 5 and 6, in some embodiments, the connector body 121 includes a first straight pipe section 1213, a first transition pipe section 1214, and a second straight pipe section 1215, which are connected sequentially. The first straight pipe section 1213 has a first connector end 1211, and the second straight pipe section 1215 has a second connector end 1212. The inner diameter of the first straight pipe section 1213 is smaller than the inner diameter of the second straight pipe section 1215. The inner and outer diameters of the first straight pipe section 1213 are equal everywhere, as are the inner and outer diameters of the second straight pipe section 1215. The inner and outer diameters of the first transition pipe section 1214 gradually increase in the direction from the first straight pipe section 1213 to the second straight pipe section 1215.

[0090] Please refer to Figures 7 and 8. Figure 7 is a schematic diagram of the fifth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment. Figure 8 is a schematic diagram of the sixth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment.

[0091] As shown in Figures 7 and 8, in some embodiments, the connector body 121 includes a first straight pipe section 1213, a first transition pipe section 1214, and a second straight pipe section 1215, which are connected sequentially. The first straight pipe section 1213 has a first connector end 1211, and the second straight pipe section 1215 has a second connector end 1212. The inner diameter of the first straight pipe section 1213 is larger than the inner diameter of the second straight pipe section 1215. The inner and outer diameters of the first straight pipe section 1213 are equal everywhere, the inner and outer diameters of the second straight pipe section 1215 are equal everywhere, and the inner and outer diameters of the first transition pipe section 1214 gradually decrease in the direction from the first straight pipe section 1213 to the second straight pipe section 1215.

[0092] The shape of the extension tube 123 can also be one of the following three types.

[0093] As shown in Figures 5 and 6, in some embodiments, the extension tube 123 is a straight tube.

[0094] As shown in Figures 3 and 4, the extension pipe 123 includes a third straight pipe section 1233, a second transition pipe section 1234, and a fourth straight pipe section 1235, which are connected sequentially. The inner diameter of the third straight pipe section 1233 is smaller than that of the fourth straight pipe section 1235. The end of the third straight pipe section 1233 away from the second transition pipe section 1234 forms a first mating end 1231, which is connected to the first copper sleeve 122. The end of the fourth straight pipe section 1235 away from the second transition pipe section 1234 forms a second mating end 1232, which is connected to the system piping 2. Among them, the inner and outer diameters of the third straight pipe section 1233 are equal everywhere, the inner and outer diameters of the fourth straight pipe section 1235 are equal everywhere, and the inner and outer diameters of the second transition pipe section 1234 gradually increase in the direction from the third straight pipe section 1233 to the fourth straight pipe section 1235.

[0095] As shown in Figures 7 and 8, the extension pipe 123 includes a third straight pipe section 1233, a second transition pipe section 1234, and a fourth straight pipe section 1235, which are connected sequentially. The inner diameter of the third straight pipe section 1233 is larger than that of the fourth straight pipe section 1235. The end of the third straight pipe section 1233 away from the second transition pipe section 1234 forms a first mating end 1231, which is connected to the first copper sleeve 122. The end of the fourth straight pipe section 1235 away from the second transition pipe section 1234 forms a second mating end 1232, which is connected to the system piping 2. Among them, the inner and outer diameters of the third straight pipe section 1233 are equal everywhere, the inner and outer diameters of the fourth straight pipe section 1235 are equal everywhere, and the inner and outer diameters of the second transition pipe section 1234 gradually decrease in the direction from the third straight pipe section 1233 to the fourth straight pipe section 1235.

[0096] To enhance the structural strength of the extension pipe 123, in some optional embodiments, the extension pipe 123 is a one-piece structure. That is, regardless of whether the extension pipe 123 is a straight pipe, or whether it comprises a third straight pipe section 1233, a second transition pipe section 1234, and a fourth straight pipe section 1235, with these sections connected sequentially, the extension pipe 123 is formed from a single piece of tubing, with no seams on its surface. Thus, by maintaining the overall integrity of the extension pipe 123, its overall structural strength is enhanced.

[0097] Please refer to Figures 9 and 10. Figure 9 is a schematic diagram of the seventh structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment, and Figure 10 is a schematic diagram of the eighth structure for connecting the valve pipe to the system piping in the refrigerant switching assembly provided in this application embodiment. It is understood that if the required length of the extension pipe 123 is large, it cannot be formed from a single piece of pipe. Therefore, when the extension pipe 123 is long, it includes a first connecting pipe 1236 and a second connecting pipe 1237, which are connected together. The first end of the first connecting pipe 1236 forms a first mating end 1231, which is connected to the first copper sleeve 122. The first end of the second connecting pipe 1237 forms a second mating end 1232, which is connected to the system piping 2. The second end of the first connecting pipe 1236 and the second end of the second connecting pipe 1237 are inserted into each other.

[0098] There are three possible shapes for the first connecting pipe 1236 and the second connecting pipe 1237.

[0099] Specifically, as shown in Figures 9 and 10, both the first connecting pipe 1236 and the second connecting pipe 1237 are straight pipes.

[0100] Please refer to Figures 11 and 12. Figure 11 is a ninth structural diagram of the connection between the valve pipe and the system piping in the refrigerant switching assembly provided in this application embodiment, and Figure 12 is a tenth structural diagram of the connection between the valve pipe and the system piping in the refrigerant switching assembly provided in this application embodiment.

[0101] As shown in Figures 11 and 12, the first connecting pipe 1236 includes a first DC connecting pipe section 1238, a first transition connecting pipe section 1239, and a second DC connecting pipe section 1240. These sections are connected sequentially. The inner diameter of the first DC connecting pipe section 1238 is larger than the inner diameter of the second DC connecting pipe section 1240. The end of the first DC connecting pipe section 1238 furthest from the first transition connecting pipe section 1239 forms a first mating end 1231. The end of the second DC connecting pipe section 1240 furthest from the first transition connecting pipe section 1239 is inserted into the second end of the second connecting pipe 1237. The second connecting pipe 1237 is a straight pipe. The inner and outer diameters of the first DC connection pipe section 1238 are equal everywhere, the inner and outer diameters of the second DC connection pipe section 1240 are equal everywhere, and the inner and outer diameters of the first transition connection pipe section 1239 gradually decrease in the direction from the first DC connection pipe section 1238 to the second DC connection pipe section 1240.

[0102] Please refer to Figures 13 and 14. Figure 13 is an eleventh structural diagram of the connection between the valve pipe and the system piping in the refrigerant switching assembly provided in this application embodiment, and Figure 14 is a twelfth structural diagram of the connection between the valve pipe and the system piping in the refrigerant switching assembly provided in this application embodiment.

[0103] As shown in Figures 13 and 14, the first connecting pipe 1236 includes a first DC connecting pipe section 1238, a first transition connecting pipe section 1239, and a second DC connecting pipe section 1240. These sections are connected sequentially. The inner diameter of the first DC connecting pipe section 1238 is smaller than the inner diameter of the second DC connecting pipe section 1240. The end of the first DC connecting pipe section 1238 furthest from the first transition connecting pipe section 1239 forms a first mating end 1231. The end of the second DC connecting pipe section 1240 furthest from the first transition connecting pipe section 1239 is inserted into the second end of the second connecting pipe 1237. The second connecting pipe 1237 is a straight pipe. The inner and outer diameters of the first DC connection pipe section 1238 are equal everywhere, the inner and outer diameters of the second DC connection pipe section 1240 are equal everywhere, and the inner and outer diameters of the first transition connection pipe section 1239 gradually increase in the direction from the first DC connection pipe section 1238 to the second DC connection pipe section 1240.

[0104] Please refer to Figures 15 and 16. Figure 15 is a schematic diagram of the thirteenth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment. Figure 16 is a schematic diagram of the fourteenth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment.

[0105] As shown in Figures 15 and 16, the first connecting pipe 1236 is a straight pipe, and the second connecting pipe 1237 includes a third DC connecting pipe section 1241, a second transition connecting pipe section 1242, and a fourth DC connecting pipe section 1243. The third DC connecting pipe section 1241, the second transition connecting pipe section 1242, and the fourth DC connecting pipe section 1243 are connected in sequence. The inner diameter of the third DC connecting pipe section 1241 is larger than the inner diameter of the fourth DC connecting pipe section 1243. The end of the third DC connecting pipe section 1241 that is away from the second transition connecting pipe section 1242 is inserted into the second end of the first connecting pipe 1236, and the end of the fourth DC connecting pipe section 1243 that is away from the second transition connecting pipe section 1242 forms the second mating end 1232. Among them, the inner and outer diameters of the third DC connection pipe section 1241 are equal everywhere, the inner and outer diameters of the fourth DC connection pipe section 1243 are equal everywhere, and the inner and outer diameters of the second transition connection pipe section 1242 gradually decrease in the direction from the third DC connection pipe section 1241 to the fourth DC connection pipe section 1243.

[0106] Please refer to Figures 17 and 18. Figure 17 is a schematic diagram of the fifteenth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment. Figure 18 is a schematic diagram of the sixteenth structure of the valve connection and system piping connection in the refrigerant switching assembly provided in this application embodiment.

[0107] As shown in Figures 17 and 18, the first connecting pipe 1236 is a straight pipe, and the second connecting pipe 1237 includes a third DC connecting pipe section 1241, a second transition connecting pipe section 1242, and a fourth DC connecting pipe section 1243. The third DC connecting pipe section 1241, the second transition connecting pipe section 1242, and the fourth DC connecting pipe section 1243 are connected in sequence. The inner diameter of the third DC connecting pipe section 1241 is smaller than the inner diameter of the fourth DC connecting pipe section 1243. The end of the third DC connecting pipe section 1241 that is away from the second transition connecting pipe section 1242 is inserted into the second end of the first connecting pipe 1236, and the end of the fourth DC connecting pipe section 1243 that is away from the second transition connecting pipe section 1242 forms the second mating end 1232. Among them, the inner and outer diameters of the third DC connection pipe section 1241 are equal everywhere, the inner and outer diameters of the fourth DC connection pipe section 1243 are equal everywhere, and the inner and outer diameters of the second transition connection pipe section 1242 gradually increase in the direction from the third DC connection pipe section 1241 to the fourth DC connection pipe section 1243.

[0108] As described above, the extension pipe 123 is connected to the first copper sleeve 122 by welding, and the extension pipe 123 is also connected to the system piping 2 by welding. When manufacturing the refrigerant switching assembly provided in this embodiment, the extension pipe 123 can be welded to the first copper sleeve 122 first, and then the extension pipe 123 can be welded to the system piping 2. Specifically, the first mating end 1231 is welded to the first copper sleeve 122 using first solder 4, and the second mating end 1232 is welded to the system piping 2 using second solder 5.

[0109] It is understandable that if the melting point of the first solder 4 is lower than that of the second solder 5, then when the extension tube 123 is welded together with the system piping 2, the molten second solder 5 may fall to the location of the first solder 4, causing the first solder 4 to melt. This would affect the connection between the extension tube 123 and the first copper sleeve 122.

[0110] Therefore, in this embodiment, the melting point of the first solder 4 is greater than or equal to the melting point of the second solder 5. Thus, during the welding process between the extension pipe 123 and the system piping 2, the melting of the weld seam formed by the first solder 4 can be avoided to a certain extent. This improves the connection strength between the extension pipe 123 and the first copper sleeve 122.

[0111] It should be noted that the first solder 4 mentioned above can be a copper solder with a high melting point, and the second solder 5 mentioned above can be an inexpensive phosphor bronze solder or a tin copper solder with a low melting point, etc. Here, there are no specific restrictions on the types of the first solder 4 and the second solder 5.

[0112] Further, as shown in Figures 10, 12, 14, 16, and 18, the system piping 2 is made of stainless steel and is equipped with a second copper sleeve 3; the extension pipe 123 includes a first connecting pipe 1236 and a second connecting pipe 1237. The first end of the first connecting pipe 1236 forms a first mating end 1231, and the first end of the second connecting pipe 1237 forms a second mating end 1232. The second end of the first connecting pipe 1236 is inserted into the second end of the second connecting pipe 1237. In this structure, when manufacturing the refrigerant switching assembly provided in this embodiment, the first connecting pipe 1236 needs to be welded to the first copper sleeve 122 first, then the second connecting pipe 1237 needs to be welded to the second copper sleeve 3, and finally, the first connecting pipe 1236 needs to be welded to the second copper sleeve 3.

[0113] To prevent the welds at the joints of the first connecting pipe 1236 and the first copper sleeve 122, and the second connecting pipe 1237 and the second copper sleeve 3, from melting, in some embodiments, the second ends of the first connecting pipe 1236 and the second ends of the second connecting pipe 1237 are welded together using a third solder 6. The melting points of the first solder 4 and the second solder 5 are both greater than the melting point of the third solder 6. This prevents the molten third solder 6 from falling onto the locations of the first solder 4 and the second solder 5 during welding, thus avoiding melting of the welds at the locations of the first solder 4 and the second solder 5. This improves the connection reliability between the first connecting pipe 1236 and the first copper sleeve 122, and between the second connecting pipe 1237 and the second copper sleeve 3.

[0114] Of course, if the welding efficiency between the first connecting pipe 1236 and the second connecting pipe 1237 is high, the manufacturing efficiency of the refrigerant switching assembly provided in this embodiment can be improved. Therefore, as shown in Figures 13 and 14, in some optional embodiments, in order to improve the welding convenience between the first connecting pipe 1236 and the second connecting pipe 1237, the third solder 6 can be formed by melting a welding ring 7 built into the first connecting pipe 1236 or the second connecting pipe 1237.

[0115] Understandably, before welding the first connecting pipe 1236 to the second connecting pipe 1237, a welding ring 7 is first inserted into the second end of either the first connecting pipe 1236 or the second end of the second connecting pipe 1237. Then, the second end of both the first and second connecting pipes is heated. Once the welding ring 7 reaches its melting point, it melts to form a third solder 6. The weld formed after the third solder 6 cools welds the second end of the first connecting pipe 1236 and the second end of the second connecting pipe 1237 together. This improves the ease of welding the first connecting pipe 1236 to the second connecting pipe 1237.

[0116] It should be noted that in some other embodiments, the first solder 4 may be formed by melting a solder ring embedded in the first mating end 1231 or the first copper sleeve 122, and the second solder 5 may be formed by melting a solder ring embedded in the second mating end 1232, the system piping 2, or the second copper sleeve 3. No specific limitations are imposed here.

[0117] To improve the connection reliability between the extension tube 123 and the first copper sleeve 122, in some specific embodiments, a first radial gap 8 is provided between the first mating end 1231 and the first copper sleeve 122 in the radial direction of the first mating end 1231. The first radial gap 8 is used to allow the first solder 4 to flow in. The first radial gap 8 can provide flow space for the molten first solder 4, which can increase the spreading length of the first solder 4, thereby improving the welding reliability between the first mating end 1231 and the first copper sleeve 122.

[0118] Please refer to Figure 19, which is a schematic diagram of the seventeenth structure for the connection between the valve connector and the system piping in the refrigerant switching assembly provided in this application embodiment. As shown in the figure, in order to further improve the welding reliability between the extension pipe 123 and the first copper sleeve 122, the first mating end 1231 or the first copper sleeve 122 is provided with a first textured structure 9 located in the first radial gap 8. The first textured structure 9 can be formed on the outer wall surface of the first mating end 1231 or on the inner wall surface of the first copper sleeve 122.

[0119] By setting the first textured structure 9, the roughness of the connection surface between the first mating end 1231 and the first copper sleeve 122 can be improved, thereby providing a capillary effect for the first solder 4, allowing the first solder 4 to flow along the first textured structure 9, thereby further increasing the spreading length of the first solder 4, and thus improving the welding reliability between the extension tube 123 and the first copper sleeve 122.

[0120] The first texture structure 9 can be a brushed structure or a knurled structure, or a structure that can improve surface roughness. No specific restrictions are placed on the form of the first texture structure 9.

[0121] Similarly, a second radial gap 10 is provided between the second mating end 1232 and the system piping 2 in the radial direction of the second mating end 1232, and the second radial gap 10 is used for the flow of the second solder 5. The second mating end 1232 or the system piping 2 is provided with a second textured structure (not shown in the figure), and the second textured structure (not shown in the figure) is located within the second radial gap 10.

[0122] It should be noted that the second texture structure can have the same function and form as the first texture structure 9 mentioned above. The second texture structure will not be described in detail here.

[0123] In some embodiments, the extension tube 123 and the first copper sleeve 122 can be welded together using either furnace welding or high-frequency welding. Furnace welding refers to the welding process performed in a dedicated welding furnace, where the temperature, atmosphere, and pressure are controlled to achieve the desired welding standards. High-frequency welding is a welding technique that uses the heat generated by high-frequency current to melt and join metals or other materials. Furnace welding and high-frequency welding processes will not be specifically explained here. Of course, in other embodiments, the extension tube 123 and the first copper sleeve 122 can also be connected using other welding methods, which are not specifically limited here.

[0124] In order to improve the reliability of the connection between the extension pipe 123 and the system piping 2, the laying length of the second solder 5 can be increased. The laying length of the second solder 5 is the insertion length L between the extension pipe 123 and the system piping 2. Therefore, in this embodiment, the insertion length L is limited accordingly.

[0125] Specifically, 15 mm ≤ L ≤ 20 mm. In this way, the laying length of the second solder 5 is greater than or equal to 15 mm and less than or equal to 20 mm. The larger laying length of the second solder 5 can improve the welding reliability between the extension pipe 123 and the system piping 2.

[0126] For example, L can take values ​​of 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, etc. Here, no specific limitation is made on the value of L.

[0127] Please refer to Figure 20, which is a partial structural schematic diagram of the four-way valve in the refrigerant switching assembly provided in this application embodiment. Of course, the four-way valve 1 also includes a connector 13; one end of the connector 13 is inserted into the corresponding valve port 111 and connected to the valve body 11, and the second end of the connector 13 is welded to the connecting body 121 of the valve connecting pipe 12.

[0128] The connector 13 and the valve body 121 are made of the same material, and the second end of the connector 13 is inserted into or connected to the valve body 12. That is to say, the connector 13 is also made of stainless steel.

[0129] Please refer to Figures 21 to 24. Figure 21 is a schematic diagram of the second partial structure of the HVAC equipment provided in the embodiment of this application. Figure 22 is a schematic diagram of the structure of the HVAC equipment provided in the embodiment of this application. Figure 23 is a diagram of the refrigerant flow direction of the HVAC equipment provided in the embodiment of this application during cooling. Figure 24 is a diagram of the refrigerant flow direction of the HVAC equipment provided in the embodiment of this application during heating. As shown in Figures 1 and 21 to 24, this embodiment also provides a heating, ventilation, and air conditioning (HVAC) device, including an indoor unit 100, an outdoor unit heat exchanger 60, an oil separator 30, a gas-liquid separator 40, and the refrigerant switching component described in the above embodiments. The four valve connectors 12 include a first valve connector 12a, a second valve connector 12b, a third valve connector 12c, and a fourth valve connector 12d, arranged side-by-side. The first valve connector 12a is connected to the outdoor unit heat exchanger 60 via a first system piping 2a; the second valve connector 12b is connected to the oil separator 30 via a second system piping 2b; and the third valve connector 12c is connected to the indoor unit 100 via a third system piping 2c. The fourth valve connector 12d is connected to an extension pipe 123 and to a first copper sleeve 122, which in turn is connected to the extension pipe 123. The extension pipe 123 is connected to the gas-liquid separator 40 via the fourth system piping 2d.

[0130] Furthermore, the HVAC equipment provided in this embodiment should also include a compressor 20, a filter 70, an electronic expansion valve 80, and a refrigerant heat dissipation device 90. The compressor 20 is connected to the gas-liquid separator 40, the filter 70 is connected to the outdoor unit heat exchanger 60, the electronic expansion valve 80 is connected to the filter 70, and the refrigerant heat dissipation device 90 is connected to the electronic expansion valve 80.

[0131] It should be noted that the HVAC equipment provided in this embodiment can be a multi-split air conditioning system, that is, there can be multiple indoor units 100. Here, there is no specific limitation on the number of indoor units 100.

[0132] The HVAC system shown in Figures 23 and 24 has two compressors 20 and three indoor units 100. The following description of the refrigerant flow will be based on one compressor 20 and one indoor unit 100. The refrigerant flow in the other compressor 20 and other indoor units 100 can be referred to this description.

[0133] Specifically, as shown in Figure 23, when the HVAC equipment is in cooling mode, the refrigerant flow direction is as follows: compressor 20 → oil separator 30 → four-way valve 1 → outdoor unit heat exchanger 60 → filter 70 → electronic expansion valve 80 → refrigerant heat dissipation device 90 → indoor unit 100 → four-way valve 1 → gas-liquid separator 40 → compressor 20.

[0134] It should be noted that in cooling mode, when the refrigerant flows downstream of the refrigerant heat dissipation device 90, some refrigerant will be diverted. At this time, if it is necessary to replenish the compressor 20 with gas, the direction of this part of the refrigerant should be refrigerant heat dissipation device 90 → compressor 20; if it is not necessary to replenish the compressor 20 with gas, the direction of this part of the refrigerant should be refrigerant heat dissipation device 90 → gas-liquid separator 40 → compressor 20.

[0135] As shown in Figure 24, when the HVAC equipment is in heating mode, the refrigerant flow direction is: compressor 20 → oil separator 30 → four-way valve 1 → indoor unit 100 → refrigerant heat dissipation device 90 → electronic expansion valve 80 → filter 70 → outdoor unit heat exchanger 60 → gas-liquid separator 40 → compressor 20.

[0136] It should be noted that in heating mode, when the refrigerant flows upstream of the refrigerant heat dissipation device 90, some refrigerant will be diverted. At this time, if it is necessary to replenish the compressor 20 with gas, the direction of this part of the refrigerant should be indoor unit 100 → compressor 20; if it is not necessary to replenish the compressor 20 with gas, the direction of this part of the refrigerant should be indoor unit 100 → gas-liquid separator 40 → compressor 20.

[0137] The HVAC equipment provided in this embodiment, by adopting the aforementioned refrigerant switching component, exhibits better performance and a longer service life.

Claims

1. A refrigerant switching component, wherein, Including four-way valves and system piping; The four-way valve includes a valve body and four valve connectors. The valve body has four valve ports, and the four valve connectors are configured to correspond one-to-one with the four valve ports, and the valve connectors are connected to the valve body. Wherein, at least one of the valve connectors includes a connector body, a first copper sleeve and an extension pipe connected in sequence, the connector body is connected to the valve body, the extension pipe is connected to the system piping, the connector body is made of stainless steel and the extension pipe is made of copper; The system piping is made of copper, or the system piping is made of stainless steel, and the system piping is equipped with a second copper sleeve, which is connected to the extension pipe.

2. The refrigerant switching component as described in claim 1, wherein, The extension tube has a first mating end and a second mating end that are disposed opposite to each other; The first copper sleeve is fitted on the outside of the first mating end and connected to the first mating end, and the second mating end is connected to the system piping.

3. The refrigerant switching component as described in claim 2, wherein, The system piping is made of copper; The second mating end is sleeved on the outside of the system piping and connected to the system piping.

4. The refrigerant switching component as described in claim 2, wherein, The system piping is made of stainless steel and is equipped with a second copper sleeve. The second copper sleeve is fitted onto the outside of the second mating end and connected to the second mating end.

5. The refrigerant switching component as described in claim 1, wherein, The pipe body has a first connector end and a second connector end that are disposed opposite to each other, and the first connector end is connected to the valve body. The first copper sleeve is fitted onto the outside of the second connector end and connected to the second connector end, or the second connector end is fitted onto the outside of the first copper sleeve and connected to the first copper sleeve.

6. The refrigerant switching component as described in claim 5, wherein, The connector body is a straight pipe; or, The connector body includes a first straight pipe section, a first transition pipe section, and a second straight pipe section connected in sequence. The first straight pipe section has the first connector end, and the second straight pipe section has the second connector end. The inner diameter of the first straight pipe section is greater than or less than the inner diameter of the second straight pipe section.

7. The refrigerant switching component as described in claim 1, wherein, The extension tube is a one-piece structure.

8. The refrigerant switching component as described in claim 7, wherein, The extension tube is a straight tube; or, The extension pipe includes a third straight pipe section, a second transition pipe section, and a fourth straight pipe section connected in sequence, wherein the inner diameter of the third straight pipe section is greater than or less than the inner diameter of the fourth straight pipe section; The end of the third straight pipe section furthest from the second transition pipe section forms a first mating end, which is connected to the first copper sleeve; the end of the fourth straight pipe section furthest from the second transition pipe section forms a second mating end, which is connected to the system piping.

9. The refrigerant switching component as described in claim 1, wherein, The extension tube includes a first connecting tube and a second connecting tube connected together; The first end of the first connecting pipe forms a first mating end, which is connected to the first copper sleeve; the first end of the second connecting pipe forms a second mating end, which is connected to the system piping. The second end of the first connecting tube is inserted into and engaged with the second end of the second connecting tube.

10. The refrigerant switching component as claimed in claim 9, wherein, The first connecting pipe is a straight pipe; or, The first connecting pipe includes a first DC connecting pipe segment, a first transition connecting pipe segment, and a second DC connecting pipe segment connected in sequence. The inner diameter of the first DC connecting pipe segment is greater than or less than the inner diameter of the second DC connecting pipe segment. The end of the first DC connecting pipe segment furthest from the first transition connecting pipe segment is formed as the first mating end, and the end of the second DC connecting pipe segment furthest from the first transition connecting pipe segment is inserted into the second end of the second connecting pipe.

11. The refrigerant switching component as claimed in claim 9, wherein, The second connecting pipe is a straight pipe; or, The second connecting pipe includes a third DC connecting pipe section, a second transition connecting pipe section, and a fourth DC connecting pipe section connected in sequence, wherein the inner diameter of the third DC connecting pipe section is greater than or less than the inner diameter of the fourth DC connecting pipe section; The end of the third DC connection pipe segment furthest from the second transition connection pipe segment is inserted into the second end of the first connection pipe, and the end of the fourth DC connection pipe segment furthest from the second transition connection pipe segment forms the second mating end.

12. The refrigerant switching component as claimed in claim 1, wherein, The extension tube has a first mating end and a second mating end that are disposed opposite to each other; The first mating end is welded to the first copper sleeve using a first solder, and the second mating end is welded to the system piping using a second solder; The melting point of the first solder is greater than or equal to the melting point of the second solder.

13. The refrigerant switching component as described in claim 12, wherein, The system piping is made of stainless steel and is equipped with a second copper sleeve. The extension tube includes a first connecting tube and a second connecting tube. The first end of the first connecting tube forms a first mating end, and the first end of the second connecting tube forms a second mating end. The second end of the first connecting tube is inserted into the second end of the second connecting tube. The second end of the first connecting pipe is welded to the second end of the second connecting pipe by a third solder, wherein the melting point of the first solder and the melting point of the second solder are both greater than the melting point of the third solder.

14. The refrigerant switching component as described in claim 13, wherein, The third solder is formed by melting a welding ring embedded in the first or second connecting pipe.

15. The refrigerant switching component as claimed in claim 13, wherein, In the radial direction of the first mating end, a first radial gap is provided between the first mating end and the first copper sleeve for allowing the first solder to flow in.

16. The refrigerant switching component as claimed in claim 15, wherein, The first mating end or the first copper sleeve is provided with a first textured structure located in the first radial gap.

17. The refrigerant switching component as claimed in claim 13, wherein, In the radial direction of the second mating end, a second radial gap is provided between the second mating end and the system piping for the flow of the second solder.

18. The refrigerant switching assembly as claimed in claim 17, wherein, The second mating end or the system piping is provided with a second textured structure located in the second radial gap.

19. The refrigerant switching component as claimed in claim 1, wherein, The extension tube is welded to the first copper sleeve using an in-furnace welding process or a high-frequency welding process.

20. The refrigerant switching component as claimed in claim 1, wherein, The insertion length between the extension pipe and the system piping is L, where 15 mm ≤ L ≤ 20 mm.

21. The refrigerant switching component as claimed in claim 1, wherein, The four-way valve also includes a connector; One end of the connector is inserted into the corresponding valve port and connected to the valve body, and the second end of the connector is welded to the valve connecting pipe; The connector and the valve fitting are made of the same material.

22. The refrigerant switching component as claimed in claim 21, wherein, The second end of the connector is plugged into or docked with the valve connector.

23. A heating, ventilation, and air conditioning (HVAC) device, wherein, Includes an indoor unit, an outdoor unit heat exchanger, an oil separator, a gas-liquid separator, and a refrigerant switching assembly as described in any one of claims 1 to 22; The four valve connectors include a first valve connector, a second valve connector, a third valve connector, and a fourth valve connector, with the first valve connector, the second valve connector, and the third valve connector arranged side by side. The first valve connector is connected to the outdoor unit heat exchanger through the first system piping, the second valve connector is connected to the oil separator through the second system piping, and the third valve connector is connected to the indoor unit through the third system piping. The fourth valve connector is connected to the first copper sleeve, the first copper sleeve is connected to the extension pipe, and the extension pipe is connected to the gas-liquid separator through the fourth system piping.

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