Piping assembly, device containing piping assembly, and heating, ventilation and air conditioning system

Abstract

Disclosed in the present application are a piping assembly, a device containing the piping assembly, and a heating, ventilation and air conditioning system. The piping assembly comprises a first piping, a copper pipe fitting and a second piping, wherein the first piping made of steel has a main piping wall and an insertion hole formed by lateral flanging from the main piping wall, the main piping wall forms part of a refrigerant circulation loop, and the axial length of an inner hole wall of the insertion hole is greater than the axial length of an outer hole wall; a first port of a transition pipe fitting is in insertion fit with the insertion hole, and the main component materials of the transition pipe fitting and the first piping are different; and the second piping has a connecting piping wall in insertion fit with a second port, and the main component materials of the connecting piping wall and the transition pipe fitting are the same.

Description

Piping assemblies, installations containing such piping assemblies, and HVAC systems

[0001] Related applications

[0002] This application claims priority to the following Chinese patent applications:

[0003] Application No. 202411808321.4, filed on December 9, 2024, entitled “Pipe Assembly, Installation Containing the Pipe Assembly and Heating, Ventilation and Air Conditioning System”; and Application No. 202423034308.6, filed on December 9, 2024, entitled “Pipe Assembly, Installation Containing the Pipe Assembly and Heating, Ventilation and Air Conditioning System”;

[0004] The full text of the aforementioned patent is incorporated herein by reference. Technical Field

[0005] This application relates to the field of air conditioning accessories technology, and in particular to a piping assembly, a heat exchange device containing the piping assembly, a charging device, a pressure relief device, a sensor device, a pressure switch device, and a heating, ventilation, and air conditioning system. Background Technology

[0006] In HVAC systems, compressor piping needs to be connected through multiple pipes to form a loop for the circulation and flow of heat exchange media. Different pipes can be connected using pipe joints or pipe connection structures during assembly and layout. To prevent leakage of heat exchange media in the pipes, the connection between pipes needs to ensure good sealing performance.

[0007] In related technologies, stainless steel can be used to manufacture some large-diameter pipes in order to control raw material costs. However, due to the material limitations of stainless steel pipes, the corrosion resistance of the joints between stainless steel pipes is low at the pipe bends, which can easily lead to leaks. Summary of the Invention

[0008] This application provides a piping assembly, a heat exchange device containing the piping assembly, a filling device, a pressure relief device, a sensor device, a pressure switch device, and a heating and ventilation system, which can reduce the probability of leakage in the piping assembly.

[0009] In a first aspect, embodiments of this application provide a piping assembly, including:

[0010] The first piping is formed of steel and is configured as a partial loop of the refrigerant circulation loop. The first piping forms a main pipe wall of the partial refrigerant circulation loop and a plug hole formed by a side flange of the main pipe wall. The plug hole has an inner wall and an outer wall. The axial length of the inner wall is greater than the axial length of the outer wall. The inner wall is connected to the inner wall surface of the main pipe wall, and the outer wall is connected to the outer wall surface of the main pipe wall. The main component material of the inner wall and the outer wall is the same as the main component material of the first piping.

[0011] A transition connector, wherein the diameter of the transition connector is smaller than the diameter of the main pipe wall, and the two opposite ends of the transition connector are defined as a first port and a second port, respectively. The first port is inserted into the inner wall or the outer wall and is connected to a portion of the refrigerant circulation loop formed by the first piping. The main component material of the transition connector is different from the main component material of the inner wall and the outer wall.

[0012] The second piping has a diameter smaller than that of the main pipe wall. The second piping has a connecting pipe wall that is plugged into the second port. The second piping is connected to the refrigerant circulation loop of the first piping via the transition pipe. The main component material of the connecting pipe wall is the same as that of the transition pipe.

[0013] In some embodiments of this application, the second conduit includes a connecting branch and an extension branch. The connecting branch and the extension branch are integrally or separately connected, and the inner or outer wall of the connecting branch is configured as the connecting wall. The end of the extension branch away from the connecting branch is connected to a third conduit. The main component material of the third conduit is one of stainless steel, copper, copper alloy, aluminum, or aluminum alloy.

[0014] In some embodiments of this application, the connecting branch pipe and the extending branch pipe are integrally formed, and the connecting branch pipe and the extending branch pipe are arranged along the extension direction of the second piping, and the end of the connecting branch pipe is connected to the end of the extending branch pipe.

[0015] In some embodiments of this application, the connecting branch pipe and the extension branch pipe are separately configured, with one end of the extension branch pipe inserted into the connecting branch pipe, and the outer wall of the extension branch pipe connected to the inner wall of the connecting branch pipe.

[0016] In some embodiments of this application, the extension branch is provided with a first positioning part, which abuts against the end of the connecting branch.

[0017] In some embodiments of this application, the extension branch includes a first DC section and a second DC section, the first DC section is inserted into the connecting branch and connected to the connecting branch, and the diameter of the second DC section is larger than the diameter of the first DC section; wherein, the first positioning part includes a first variable diameter inclined surface, the first variable diameter inclined surface is located between the first DC section and the second DC section, and is connected to both the first DC section and the second DC section.

[0018] In some embodiments of this application, a second positioning part is provided on the connecting branch pipe, and the second positioning part abuts against the second port of the transition pipe.

[0019] In some embodiments of this application, the second positioning part includes a first protrusion, which is disposed on the outer peripheral sidewall of the connecting branch pipe, and the first protrusion protrudes in a direction away from the pipe axis of the connecting branch pipe.

[0020] In some embodiments of this application, the transition pipe is provided with a third positioning part, which is located near the first port and abuts against the end of the insertion hole away from the main pipe wall.

[0021] In some embodiments of this application, the transition connector includes a third DC section and a fourth DC section. The third DC section is connected to the inner wall or the outer wall. The fourth DC section is located on the side of the insertion hole away from the first pipe. The diameter of the fourth DC section is larger than the diameter of the third DC section. The third positioning part includes a second diameter-changing inclined surface. The second diameter-changing inclined surface is located between the third DC section and the fourth DC section and is connected to both the third DC section and the fourth DC section.

[0022] In some embodiments of this application, the third positioning part includes a second protrusion, which is circumferentially disposed on the outer peripheral sidewall of the transition pipe and protrudes in a direction away from the pipe axis of the transition pipe.

[0023] In some embodiments of this application, the transition pipe is further provided with a fourth positioning part, which is spaced apart from the third positioning part, and the fourth positioning part abuts against the end of the second pipe.

[0024] In some embodiments of this application, the transition connector further includes a fifth DC section, which is connected to the fourth DC section and connected to the connecting pipe wall. The diameter of the fifth DC section is larger than that of the fourth DC section. The fourth positioning part includes a third variable diameter inclined surface, which is located between the fourth DC section and the fifth DC section and is connected to both the fourth DC section and the fifth DC section.

[0025] In some embodiments of this application, the fourth positioning part includes a third protrusion, which is disposed on the inner peripheral sidewall of the transition pipe and protrudes toward the pipe axis of the transition pipe.

[0026] In some embodiments of this application, the axial length of the outer hole wall is L1, wherein 0.5mm < L1 < 2mm.

[0027] In some embodiments of this application, the first port is inserted into the plug hole, and the distance between the end of the first port and the main pipe wall along the hole axis direction of the plug hole is L2, wherein 1mm < L2 < 10mm.

[0028] In some embodiments of this application, the depth to which the end of the second pipe is inserted into the second port is L3, wherein 5mm < L3 < 20mm.

[0029] In some embodiments of this application, the distance between the second port and the end of the plug hole away from the main pipe wall is L4, where 5mm < L4 < 300mm.

[0030] In some embodiments of this application, the end of the second pipe is inserted into the transition pipe and overlaps with the inner wall of the hole. The distance between the end of the second pipe and the end of the insertion hole away from the main pipe wall is L5, where 0mm < L5 < 10mm.

[0031] Secondly, this application also provides a heat exchange device, including a heat exchange body, a compressor, and a piping assembly as described in any of the above embodiments. The compressor is connected to the heat exchange body, and the first piping is configured as a manifold and connected to the exhaust side of the compressor. A plurality of insertion holes are formed by flanged flanges from the main wall side of the first piping, and the plurality of insertion holes are arranged in a row along the axial direction of the first piping.

[0032] The piping assembly includes multiple transition pipes and multiple second pipes. The multiple transition pipes are inserted into the multiple insertion holes in a one-to-one correspondence. The multiple second pipes are inserted into the multiple transition pipes in a one-to-one correspondence. The multiple second pipes are configured as heat exchange tubes of the heat exchange body for heat exchange with an external heat source.

[0033] Thirdly, embodiments of this application also provide a charging device, including a charging valve and a piping assembly as described in any of the above embodiments. The end of the second piping away from the transition pipe is connected to the charging valve. The charging valve is used to receive external refrigerant charging in the open state. The first piping is configured as the low-pressure side outlet pipe of the outdoor unit in the refrigerant circulation loop. One axial port of the low-pressure side outlet pipe of the outdoor unit is connected to the low-pressure side shut-off valve of the outdoor unit in the refrigerant circulation loop, and the other axial port of the low-pressure side outlet pipe of the outdoor unit is connected to the four-way reversing valve of the outdoor unit in the refrigerant circulation loop.

[0034] Fourthly, embodiments of this application also provide a pressure relief device, including a piping assembly as described in any of the above embodiments, wherein the first piping is configured as an exhaust pipe, one axial port of the exhaust pipe is connected to the exhaust port of the compressor in the refrigerant circulation loop, and the other axial port of the exhaust pipe is connected to the four-way reversing valve of the outdoor unit in the refrigerant circulation loop.

[0035] The second piping is configured as a pressure relief branch pipe, one of the axial ports of which is plugged into the transition pipe, and the other axial port of which is connected to the low-pressure tank in the refrigerant circulation loop;

[0036] The pressure relief branch pipe is equipped with a pressure relief valve, which has a preset pressure relief threshold. When the pressure in the exhaust pipe exceeds the pressure relief threshold, the pressure relief valve opens, and the pressure relief branch pipe guides part of the refrigerant to the low-pressure tank in the refrigerant circulation loop.

[0037] In some embodiments of this application, the pressure relief branch pipe includes a capillary section and a pressure relief valve section. One end of the capillary section is connected to the exhaust pipe, and the other end of the capillary section is connected to one end of the pressure relief valve section. The other end of the pressure relief valve section is connected to the low-pressure tank.

[0038] Fifthly, embodiments of this application also provide a sensor device, including a sensor and a piping assembly as described in any of the above embodiments, wherein one end of the second piping is connected to the transition pipe and the other end of the second piping is connected to the sensor, and the sensor is one of a temperature sensor and a pressure sensor.

[0039] Sixthly, embodiments of this application also provide a pressure switch and a piping assembly as described in any of the above embodiments, wherein one end of the second piping is connected to the transition pipe and the other end of the second piping is connected to the pressure switch.

[0040] In a seventh aspect, embodiments of this application also provide a heating, ventilation, and air conditioning system, including an outdoor unit, an indoor unit, a gas pipe, a liquid pipe, and a piping assembly as described in any of the above embodiments. The gas pipe and the liquid pipe jointly connect the indoor unit and the outdoor unit. The indoor unit, the outdoor unit, the gas pipe, the liquid pipe, and the piping assembly together form the refrigerant circulation loop. The piping assembly is disposed in the outdoor unit or inside the outdoor unit.

[0041] Based on the piping assembly and the heat exchange device, filling device, pressure relief device, sensor device, pressure switch device, and HVAC system containing the piping assembly in this application embodiment, this embodiment provides a flanged insertion hole on the main wall of the first piping, and connects the flanged insertion hole to the second piping through a transition pipe. The wall of the insertion hole contacts the transition pipe, thereby increasing the connection contact area between the transition pipe and the first piping and improving the connection reliability between the transition pipe and the first piping. At the same time, the connection surface between the second piping and the transition pipe is made of copper, copper alloy, aluminum, or aluminum alloy, which further improves the connection strength and reliability of the piping assembly and reduces the leakage risk of the piping assembly. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 is a schematic diagram of the piping assembly in one embodiment of this application;

[0044] Figure 2 is a cross-sectional structural diagram of a portion of the piping assembly in one embodiment of this application;

[0045] Figure 3 is a cross-sectional view of the first piping in one embodiment of this application;

[0046] Figure 4 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0047] Figure 5 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0048] Figure 6 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0049] Figure 7 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0050] Figure 8 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0051] Figure 9 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0052] Figure 10 is a cross-sectional structural diagram of a portion of the piping assembly in another embodiment of this application;

[0053] Figure 11 is a schematic diagram of the heat exchange device in one embodiment of this application;

[0054] Figure 12 is an enlarged structural diagram of point A in Figure 11;

[0055] Figure 13 is a schematic diagram of the filling device in one embodiment of this application;

[0056] Figure 14 is a schematic diagram of the pressure relief device in one embodiment of this application;

[0057] Figure 15 is a schematic diagram of the sensor device and pressure switch device in one embodiment of this application.

[0058] Reference numerals: 1. Piping assembly; 10. First piping; 11. Main pipe wall; 12. Insertion hole; 121. Inner hole wall; 122. Outer hole wall; 20. Transition pipe; 21. First port; 22. Second port; 23. Third DC section; 24. Fourth DC section; 25. Fifth DC section; 30. Second piping; 31. Connecting branch pipe; 32. Extension branch pipe; 321. First DC section; 322. Second DC section; 33. Connecting pipe wall; 41. First positioning part; 42. Second positioning part; 43. Third positioning part; 44. Fourth positioning part; 2. Heat exchanger; 201. Heat exchanger body; 202. Four-way reversing valve; 3. Filling device; 301. Filling valve; 4. Pressure relief device; 401. Pressure relief valve; 5. Sensor device; 501. Sensor; 6. Pressure switch device; 601. Pressure switch. Detailed Implementation

[0059] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, a clear and complete description will be provided below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0060] In related technologies, in order to control raw material costs, stainless steel can be used to make some large-diameter pipes in air conditioning. However, due to the material of the steel pipe, the corrosion resistance of the pipe connections is low at the pipe bends, which can easily lead to leaks.

[0061] In view of the above situation, firstly, please refer to Figures 1-3. This application proposes a piping assembly 1, including a first piping 10, a transition connector 20, and a second piping 30.

[0062] As shown in Figure 3, the first pipe 10 is constructed as a partial loop of the refrigerant circulation loop, so the first pipe 10 can be used to provide a circulation path for the refrigerant. The first pipe 10 forms the main pipe wall 11 of the partial refrigerant circulation loop and the insertion hole 12 formed by the side flange of the main pipe wall 11. The flange structure is provided on the side of the main pipe wall 11 so that the end of the transition pipe 20 can be better connected to the main pipe wall 11, reducing the gaps generated when the transition pipe 20 and the main pipe wall 11 are connected.

[0063] The insertion hole 12 has an inner hole wall 121 and an outer hole wall 122. The axial length of the inner hole wall 121 is greater than the axial length of the outer hole wall 122. One end of the inner hole wall 121 is connected to the inner wall surface of the main pipe wall 11, and one end of the outer hole wall 122 is connected to the outer wall surface of the main pipe wall 11. The other end of the inner hole wall 121 is flush with the other end of the outer hole wall 122. Therefore, the distance between the axial length of the inner hole wall 121 and the axial length of the outer hole wall 122 is the wall thickness of the main pipe wall 11.

[0064] As shown in Figure 2, the two opposite ends of the transition connector 20 are defined as the first port 21 and the second port 22, respectively. The first port 21 is inserted into the insertion hole 12 and is connected to a portion of the refrigerant circulation loop formed by the first pipe 10. The first port 21 can be connected to the inner wall 121 or the outer wall 122. Preferably, the first port 21 is inserted into the insertion hole 12, that is, the first port 21 is connected to the inner wall 121. The second pipe 30 has a connecting pipe wall 33, and the second port 22 is inserted into the connecting pipe wall 33. The second pipe 30 is connected to the portion of the refrigerant circulation loop formed by the first pipe 10 via the transition connector 20.

[0065] The first conduit 10 is made of steel, which can reduce the production cost of the conduit assembly 1. The main component materials of the inner wall 121 and the outer wall 122 are the same as those of the first conduit 10, that is, the main component materials of the inner wall 121 and the outer wall 122 are both steel. The main component material of the transition pipe 20 is different from that of the inner wall 121 and the outer wall 122, that is, the main component material of the transition pipe 20 is not steel. The main component material of the transition pipe 20 can be one of copper, copper alloy, aluminum or aluminum alloy. The main component material of the connecting pipe wall 33 is the same as that of the transition pipe 20. The main component materials of the connecting pipe wall 33 and the transition pipe 20 are one of copper, copper alloy, aluminum or aluminum alloy. For example, the transition pipe 20 is a copper pipe, and the connecting pipe wall 33 of the second pipe 30 is made of copper, thereby improving the reliability of the connection between the second pipe 30 and the transition pipe 20 and reducing the probability of leakage of the piping assembly 1; the other parts of the second pipe 30 except for the connecting pipe wall 33 can be made of stainless steel.

[0066] Specifically, the second piping 30 can serve as a service port for installing functional components such as pressure sensors and valve bodies. It can also be used to fill refrigerant. Therefore, the diameters of both the transition pipe 20 and the second piping 30 are smaller than the diameter of the main pipe wall 11. This facilitates control of the refrigerant flow rate within the main pipe wall 11 into the transition pipe 20 and the second piping 30, and allows the second piping 30 to connect more easily to external functional components, reducing the contact area at the connection points and lowering the probability of leakage in the piping assembly 1.

[0067] It should be noted that the transition connector 20 is made of one of the following materials: copper, copper alloy, aluminum, or aluminum alloy. Therefore, the connection between the transition connector 20 and the first pipe 10 and the second pipe 30 is more reliable, which can reduce the probability of leakage in the piping assembly 1. In this embodiment, a flanged insertion hole 12 is provided on the main pipe wall 11 of the first pipe 10, and the flanged insertion hole 12 is connected to the second pipe 30 through the transition connector 20. The inner wall 121 of the insertion hole 12 contacts the transition connector 20, thereby increasing the connection contact area between the transition connector 20 and the first pipe 10 and improving the connection reliability between the transition connector 20 and the first pipe 10. At the same time, the connection surface between the second pipe 30 and the transition connector 20 is made of one of the following materials: copper, copper alloy, aluminum, or aluminum alloy, which further improves the connection strength and reliability of the piping assembly 1 and reduces the leakage risk of the piping assembly 1.

[0068] In some embodiments, the first port 21 is inserted into the plug hole 12, that is, the first port 21 is connected to the inner hole wall 121. The wall surface of the plug hole 12 extends outward along its hole axis direction towards the main pipe wall 11, thereby making the connection between the first port 21 of the transition pipe 20 and the inner hole wall 121 of the plug hole 12 more convenient and reducing the length of the transition pipe 20 inserted into the main pipe wall 11, thereby reducing the noise emitted by the piping assembly 1 during operation.

[0069] Referring to Figure 2, in some embodiments of this application, the axial length of the outer bore wall 122 is L1, where L1 satisfies 0.5mm < L1 < 2mm, for example, L1 can be 1.3mm. This ensures that the outer bore wall 122 has sufficient height to connect with the transition pipe 20, and guarantees sufficient welding strength and reliability between the transition pipe 20 and the outer bore wall 122, reducing the risk of leakage when the transition pipe 20 is subsequently connected to the outer bore wall 122.

[0070] As shown in Figure 2, the first port 21 of the transition connector 20 is inserted into the insertion hole 12. Along the axial direction of the insertion hole 12, the distance between the end of the first port 21 and the main pipe wall 11 is L2, that is, the depth to which the transition connector 20 is inserted into the insertion hole 12 is L2. L2 satisfies 1mm < L1 < 10mm, for example, L2 can be 5mm. When the insertion depth L2 of the transition connector 20 is less than 1mm, the insertion depth of the transition connector is insufficient, which may easily lead to insufficient fusion depth between the transition connector 20 and the insertion hole 12, thereby affecting the reliability of the connection of the piping assembly 1. When the insertion depth L2 of the transition connector 12 is greater than 10mm, it will cause excessive noise in the piping assembly 1.

[0071] The inner wall 121 of the insertion hole 12 and the transition pipe 20 can be connected by furnace brazing. Before welding, the first port 21 of the transition pipe 20 is inserted into the insertion hole 12. The outer diameter of the first port 21 can be smaller than the inner diameter of the insertion hole 12. The first solder is placed between the outer wall of the first port 21 and the inner wall 121. After the first solder melts and cools in the furnace, the outer wall of the first port 21 and the inner wall 121 can be welded together. The peripheral sidewalls of the first port 21 are all welded to the inner wall 121 by the first solder, which can ensure the reliability of the welding.

[0072] As shown in Figure 2, the depth to which the end of the second conduit 30 is inserted into the second port 22 is L3, where L3 satisfies 5mm < L3 < 20mm, for example, L3 can be 7mm. This ensures sufficient welding strength and reliability between the second conduit 30 and the transition pipe 20, reducing the risk of leakage when the second conduit 30 is subsequently connected to the transition pipe 20.

[0073] Since the second piping 30 serves as a service port, it can be used to install functional components such as pressure sensors and valve bodies, and can also be used to fill refrigerant. Therefore, the second piping 30 and the transition pipe 20 can be connected by manual brazing. Similarly, before welding, the end of the second piping 30 is inserted into the second port 22. The outer diameter of the second piping 30 can be smaller than the inner diameter of the second port 22. The second solder is placed between the outer wall of the second piping 30 and the inner wall of the second port 22. After the second solder is melted by a manual flame and cooled, the outer wall of the second piping 30 and the inner wall of the second port 22 can be welded together. Furthermore, the peripheral walls of the second piping 30 are all welded to the inner wall of the second port 22 by the second solder to ensure the reliability of the weld. In this embodiment, the transition pipe 20 is only connected to the first piping 10 by furnace brazing, while the second piping 30 is connected to the transition pipe 20 by manual brazing. Therefore, the strength of the second piping 30 can be prevented from decreasing due to the annealing of the furnace brazing.

[0074] It should be noted that the melting point of the first solder is greater than that of the second solder. When the second pipe 30 and the transition pipe 20 are welded, the second solder will melt and adhere to achieve the weld. At this time, the first solder between the transition pipe 20 and the inner wall 121 of the insertion hole 12 has not reached its melting point and will remain unmelted, that is, the transition pipe 20 and the inner wall 121 of the insertion hole 12 are kept in a welded and fixed state.

[0075] As shown in Figure 2, the distance between the second port 22 and the end of the insertion hole 12 furthest from the main pipe wall 11 is L4, which is the length of the transition pipe 20 exposed outside the insertion hole 12 is L4. L4 satisfies 5mm < L4 < 300mm, for example, L4 can be 15mm, 100mm, or 200mm. This ensures that the transition pipe 20 has sufficient length to connect the first pipe 10 and the second pipe 30. Ensuring sufficient length of the transition pipe 20 reduces the probability of cracking during welding with the inner wall 121 of the insertion hole 12 and facilitates the welding operation.

[0076] As shown in Figure 4, the end of the second pipe 30 is inserted into the transition pipe 20 and overlaps with the inner wall 121. The distance between the end of the second pipe 30 and the end of the insertion hole 12 away from the main pipe wall 11 is L5, and L5 satisfies 0mm < L5 < 10mm. For example, L5 can be 1mm.

[0077] It is understandable that the second conduit 30 overlaps with part or all of the inner wall 121, and the second conduit 30 and the portion of the transition pipe 20 exposed in the insertion hole 12 also overlap. This can increase the welding area between the second conduit 30 and the transition pipe 20, thereby improving the welding reliability of the second conduit 30. At the same time, when L5 is greater than 10mm, it will cause excessive noise in the conduit assembly 1.

[0078] Please refer to Figures 5-6. In some embodiments of this application, the second conduit 30 includes a connecting branch pipe 31 and an extension branch pipe 32. The connecting branch pipe 31 and the extension branch pipe 32 are connected integrally or separately, and the inner or outer wall of the connecting branch pipe 31 is configured as a connecting wall 33. For example, the connecting branch pipe 31 can be a copper pipe, thus improving the reliability of the connection between the connecting branch pipe 31 and the transition pipe 20 and reducing the risk of leakage at the connection between the second conduit 30 and the transition pipe 20. Specifically, the material and installation scheme of the second conduit 30 can be selected according to the actual application scenario. For example, the connecting branch pipe 31 can be a copper pipe, and the extension branch pipe 32 can also be a copper pipe or a steel pipe; the connection form between the connecting branch pipe 31 and the extension branch pipe 32 will be detailed below.

[0079] Among them, the end of the extension pipe 32 away from the connecting pipe 31 is connected to the third pipe. The main component material of the third pipe is one of stainless steel, copper, copper alloy, aluminum or aluminum alloy. The third pipe can be a pipe connected to some functional components. The first pipe 10, the transition pipe 20, the second pipe 30 and the third pipe can jointly form part of the refrigerant circulation loop.

[0080] In some embodiments, as shown in FIG5, the connecting branch pipe 31 and the extending branch pipe 32 are integrally disposed and arranged along the extension direction of the second piping 30, and the end of the connecting branch pipe 31 is connected to the end of the extending branch pipe 32. For example, if the second piping 30 extends vertically, the connecting branch pipe 31 and the extending branch pipe 32 are also arranged vertically. The connecting branch pipe 31 may be located below the extending branch pipe 32. The bottom end of the connecting branch pipe 31 is inserted into the second port 22 of the transition pipe 20, and the top end of the connecting branch pipe 31 is fixed to the bottom end of the extending branch pipe 32 by welding.

[0081] Alternatively, as shown in Figure 6, the extension pipe 32 and the connecting pipe 31 are set separately. One end of the extension pipe 32 is inserted into the connecting pipe 31 and connected to the connecting pipe 31. The outer wall of the extension pipe 32 and the inner wall of the connecting pipe 31 are fixed by welding.

[0082] Further, referring to Figure 6, in some embodiments of this application, when one end of the extension pipe 32 is inserted into and connected to the connecting pipe 31, a first positioning part 41 is provided on the extension pipe 32, and the first positioning part 41 abuts against the end of the connecting pipe 31. It can be understood that the first positioning part 41 can determine the relative position between the connecting pipe 31 and the extension pipe 32, ensuring the depth to which the extension pipe 32 is inserted into the connecting pipe 31 during the installation of the second piping 30. Furthermore, after the extension pipe 32 has been inserted to a sufficient depth, the first positioning part 41 can prevent further insertion of the extension pipe 32. The first positioning part 41 provides positioning and limiting functions for the connecting pipe 31.

[0083] Furthermore, as shown in Figure 6, the extension branch pipe 32 includes a first DC section 321 and a second DC section 322. The first DC section 321 is inserted into and connected to the connecting branch pipe 31. The diameter of the second DC section 322 is larger than the diameter of the first DC section 321. The first positioning part 41 includes a first variable diameter inclined surface (labeled 41 in Figure 6). The first variable diameter inclined surface is located between the first DC section 321 and the second DC section 322, and is connected to the second DC section 322 by the first DC section 321.

[0084] Specifically, the first variable diameter inclined surface is annular, that is, the first variable diameter inclined surface is arranged around the periphery of the extension branch pipe 32. The first variable diameter inclined surface is connected from the first DC section 321 to the second DC section 322. That is, the first variable diameter inclined surface is inclined from the first DC section 321 to the second DC section 322. The diameter of the first variable diameter inclined surface increases sequentially along the direction from the first DC section 321 to the second DC section 322. This allows the first DC section 321 to be inserted into the connecting branch pipe 31 until the first variable diameter inclined surface abuts against the opening of the connecting branch pipe 31. The outer diameter of the first variable diameter inclined surface is larger than the inner diameter of the connecting branch pipe 31, so the extension branch pipe 32 cannot be further inserted into the connecting branch pipe 31, thereby fixing the relative position between the extension branch pipe 32 and the connecting branch pipe 31.

[0085] It should be noted that, as shown in Figure 7(a), when the first DC segment 321 is inserted into the connecting pipe 31, the first DC segment 321 may partially overlap with the transition pipe 20. The connecting pipe 31 is always located between the first DC segment 321 and the transition pipe 20. When the end of the connecting pipe 31 is inserted into the transition pipe 20 and overlaps with the flange structure 12, the first DC segment 321, after being inserted into the connecting pipe 31, may also have a portion overlapping with the inner wall 121 of the insertion hole 12. Of course, as shown in Figure 7(b), the first DC segment 321 may also have no overlapping portion with the inner wall 121 of the insertion hole 12. This can be selected according to the actual situation.

[0086] Please refer to Figures 7-8. In some embodiments of this application, a second positioning part 42 is provided on the connecting branch pipe 31, and the second positioning part 42 abuts against the second port 22 of the transition pipe 20. It can be understood that the second positioning part 42 can determine the relative position between the transition pipe 20 and the connecting branch pipe 31, ensuring the depth to which the connecting branch pipe 31 is inserted into the transition pipe 20 during installation. Moreover, after the connecting branch pipe 31 is inserted to a sufficient depth, the second positioning part 42 can also prevent the connecting branch pipe 31 from being inserted further. The second positioning part 42 provides positioning and limiting functions for the connecting branch pipe 31.

[0087] Furthermore, as shown in Figures 7 and 8, the second positioning part 42 includes a first protrusion (labeled 42 in Figure 8). The first protrusion is disposed on the outer peripheral sidewall of the connecting branch pipe 31, and the first protrusion protrudes in a direction away from the pipe axis of the connecting branch pipe 31. When the connecting branch pipe 31 is inserted into the transition pipe 20, until the protruding part of the first protrusion abuts against the second port 22 of the transition pipe 20, the connecting branch pipe 31 can no longer be inserted into the transition pipe 20, thereby fixing the relative position between the connecting branch pipe 31 and the transition pipe 20.

[0088] Please refer to Figures 8-9. In some embodiments of this application, the transition connector 20 is provided with a third positioning part 43, which abuts against the end of the flange structure 12. It is understood that the third positioning part 43 can determine the relative position between the transition connector 20 and the inner wall 121 of the insertion hole 12, ensuring the depth to which the transition connector 20 is inserted into the insertion hole 12 during installation. Furthermore, after the transition connector 20 has been inserted to a sufficient depth, the third positioning part 43 can also prevent further insertion of the transition connector 20. The third positioning part 43 provides positioning and limiting functions for the transition connector 20. The structure of the third positioning part 43 may be the same as or different from the structure of the second positioning part 42, as described below.

[0089] Furthermore, as shown in FIG9(a), the transition connector 20 includes a third DC section 21 and a fourth DC section 22. The third DC section 21 is connected to the inner wall 121 of the plug hole 12, and the fourth DC section 22 is located on the side of the plug hole 12 away from the first pipe 10. The diameter of the fourth DC section 22 is larger than the diameter of the third DC section 21. The third positioning part 43 includes a second diameter-changing inclined surface (reference numeral 43 in FIG9(a)). The second diameter-changing inclined surface is located between the third DC section 21 and the fourth DC section 22, and is connected to the fourth DC section 22 by the third DC section 21.

[0090] Specifically, the second diameter-changing inclined surface is annular, that is, the second diameter-changing inclined surface is arranged around the periphery of the transition connector 20. The second diameter-changing inclined surface is connected from the third DC section 21 to the fourth DC section 22. That is, the second diameter-changing inclined surface is inclined from the third DC section 21 to the fourth DC section 22. The diameter of the second diameter-changing inclined surface increases sequentially along the direction from the third DC section 21 to the fourth DC section 22. This allows the third DC section 21 to be inserted into the insertion hole 12 until the second diameter-changing inclined surface abuts against the end of the flange structure 12. The outer diameter of the second diameter-changing inclined surface is larger than the diameter of the insertion hole 12, so the transition connector 20 cannot be further inserted into the first pipe 10, thereby fixing the relative position between the transition connector 20 and the first pipe 10.

[0091] Alternatively, as shown in Figures 8 and 9(b), the third positioning part 43 includes a second protrusion (reference numeral 43 in Figure 8). The second protrusion is annular, so it is arranged around the outer peripheral sidewall of the transition pipe 20. The second protrusion protrudes away from the pipe axis of the transition pipe 20. When the first port 21 of the transition pipe 20 is inserted into the insertion hole 12, the transition pipe 20 can no longer be inserted into the insertion hole 12 until the protruding part of the second protrusion abuts against the end of the inner hole wall, thereby fixing the relative position between the transition pipe 20 and the main pipe wall 11.

[0092] Referring to Figure 9, in some embodiments of this application, the transition connector 20 is further provided with a fourth positioning part 44, which is spaced apart from the third positioning part 43, and abuts against the end of the second pipe 30. It is understood that the fourth positioning part 44 can determine the relative position between the transition connector 20 and the second pipe 30, ensuring the depth to which the second pipe 30 is inserted into the transition connector 20 during installation. Furthermore, once the second pipe 30 has been inserted to a sufficient depth, the fourth positioning part 44 can also prevent further insertion of the second pipe 30. The fourth positioning part 44 provides positioning and limiting functions for the second pipe 30.

[0093] Similarly, the structure of the fourth positioning part 44 can be the same as or different from the structure of the third positioning part 43. As shown in Figure 9(a), the transition pipe 20 also includes a fifth DC section 23, which is connected to the fourth DC section 22 and connected to the second piping 30. The diameter of the fifth DC section 23 is larger than the diameter of the fourth DC section 22. The fourth positioning part 44 includes a third variable diameter inclined surface (labeled 44 in Figure 9(a)). The third variable diameter inclined surface is located between the fourth DC section 22 and the fifth DC section 23 and is connected to the fifth DC section 23 by the fourth DC section 22.

[0094] Specifically, the third diameter-changing inclined surface is annular, meaning it surrounds the periphery of the transition connector 20. The third diameter-changing inclined surface connects the fourth DC section 22 to the fifth DC section 23, meaning it slopes from the fourth DC section 22 to the fifth DC section 23. The diameter of the third diameter-changing inclined surface increases sequentially along the direction from the fourth DC section 22 to the fifth DC section 23. This allows the second pipe 30 to be inserted into the transition connector 20 until its end abuts against the third diameter-changing inclined surface. Since the inner diameter of the third diameter-changing inclined surface is smaller than the diameter of the second pipe 30, the second pipe 30 cannot be further inserted into the transition connector 20, thus fixing the relative position between the second pipe 30 and the transition connector 20.

[0095] Alternatively, as shown in Figure 9(b), the fourth positioning part 44 includes a third protrusion (reference numeral 44 in Figure 9(b)). The third protrusion is disposed on the inner peripheral sidewall of the transition pipe 20 and protrudes towards the pipe axis of the transition pipe 20. When the second pipe 30 is inserted into the transition pipe 20, the second pipe 30 cannot be further inserted into the transition pipe 20 until the third protrusion on the inner wall of the transition pipe 20 abuts against the end of the second pipe 30, thereby fixing the relative position between the second pipe 30 and the transition pipe 20.

[0096] In some embodiments, as shown in FIG9, the transition pipe 20 may simultaneously include a third positioning part 43 and a fourth positioning part 44, which are spaced apart from each other in the transition pipe 20. The third positioning part 43 abuts against the end of the flange structure 12, and the fourth positioning part 44 abuts against the end of the second pipe 30, thereby fixing the relative installation position between the first pipe 10, the transition pipe 20 and the second pipe 30.

[0097] In summary, the function of the second positioning part 42 is the same as that of the fourth positioning part 44. In some other embodiments, as shown in FIG8, the second positioning part 42 is separately provided on the connecting branch pipe 31 to provide positioning and limiting function for the connecting branch pipe 31. In this case, the second positioning part 42 is not required on the transition pipe 20. Alternatively, as shown in FIG10, the fourth positioning part 44 can also be separately provided on the transition pipe 20 to provide positioning and limiting function for the second piping 30 (connecting branch pipe 31). In this case, the second positioning part 42 is not required on the connecting branch pipe 31.

[0098] It should be noted that, in any of the above embodiments, the piping assembly 1 may not have a positioning part installed, and each pipe may be positioned and installed only by external tooling; or, the piping assembly 1 may be installed and positioned by selecting any one of the first positioning part 41, the second positioning part 42 (fourth positioning part 44), and the third positioning part 43; or, the piping assembly 1 may be installed and positioned by selecting any two of the first positioning part 41, the second positioning part 42 (fourth positioning part 44), and the third positioning part 43; or, the piping assembly 1 may be installed and positioned by selecting any three of the first positioning part 41, the second positioning part 42 (fourth positioning part 44), and the third positioning part 43.

[0099] Secondly, referring to Figures 11-12, this application embodiment also provides a heat exchange device 2, including a heat exchange body 201, a compressor (not shown in the figures), and a piping assembly 1 as described in any of the above embodiments. The compressor is connected to the heat exchange body 201. A first piping 10 is configured as a manifold, which is connected to the exhaust side of the compressor. A plurality of insertion holes 12 are formed by flanging from the main pipe wall 11 of the first piping 10, and the plurality of insertion holes 12 are arranged in a row along the axial direction of the first piping 10. The piping assembly 1 includes a plurality of transition pipes 20 and a plurality of second piping 30. The plurality of transition pipes 20 are inserted into the plurality of insertion holes 12 in a one-to-one correspondence, and the plurality of second piping 30 are inserted into the plurality of transition pipes 20 in a one-to-one correspondence. The plurality of second piping 30 are configured as heat exchange tubes of the heat exchange body 201 for heat exchange with an external heat source.

[0100] Specifically, the outdoor unit includes a four-way reversing valve 202, which can be used to switch the refrigerant flow path. The four-way reversing valve 202 includes a valve body and four ports communicating with the valve body. The valve body is made of steel, and each of the four ports is provided with a copper connection part, and at least one copper connection part is connected to the first pipe 10 in a piping assembly 1. For example, three ports in the four-way reversing valve 202 are respectively connected to three piping assemblies 1, that is, the three copper connection parts are respectively connected to three first pipes 10, and the fourth port can be connected to a separate copper pipe for introducing refrigerant.

[0101] Thirdly, referring to Figure 13, this application embodiment also provides a charging device 3, including a charging valve 301 and a piping assembly 1 as described in any of the above embodiments. The end of the second piping 30 away from the transition pipe 20 is connected to the charging valve 301. The charging valve 301 can be used to accept external refrigerant charging when it is open. The first piping 10 is configured as the low-pressure side outlet pipe of the outdoor unit in the refrigerant circulation loop. One axial port of the low-pressure side outlet pipe of the outdoor unit is connected to the low-pressure side shut-off valve of the outdoor unit in the refrigerant circulation loop, and the other axial port of the low-pressure side outlet pipe of the outdoor unit is connected to the four-way reversing valve 202 of the outdoor unit in the refrigerant circulation loop.

[0102] Specifically, the second piping 30 can serve as a service piping. The end of the second piping 30 furthest from the transition pipe 20 is the service port. When not in use, the service port is a blind end. When needed, the blind end can be removed to facilitate operations such as vacuuming or refrigerant charging from the service port.

[0103] Fourthly, referring to Figure 14, this application embodiment also provides a pressure relief device 4, including a piping assembly 1 as described in any of the above embodiments. The first piping 10 is configured as an exhaust pipe, one axial port of which is connected to the exhaust port of the compressor in the refrigerant circulation loop, and the other axial port of which is connected to the four-way reversing valve 202 of the outdoor unit in the refrigerant circulation loop. The second piping 30 is configured as a pressure relief branch pipe, one axial port of which is inserted into the transition pipe 20, and the other axial port of which is connected to the low-pressure tank in the refrigerant circulation loop.

[0104] The pressure relief branch pipe is equipped with a pressure relief valve 401. The pressure relief valve 401 has a preset pressure relief threshold. When the pressure in the exhaust pipe exceeds the preset pressure relief threshold, the pressure relief valve 401 opens, allowing the pressure relief branch pipe to guide part of the refrigerant to the low-pressure tank in the refrigerant circulation loop.

[0105] Specifically, one axial port of the pressure relief branch pipe is connected to the return pipe on the compressor. One end of the return pipe is connected to the four-way reversing valve 202 of the outdoor unit, and the other end of the return pipe is connected to the low-pressure tank in the refrigerant circulation loop. This allows the refrigerant pressure inside the pressure relief branch pipe to be discharged to the low-pressure tank and the four-way reversing valve 202 through the return pipe of the compressor.

[0106] In some embodiments of this application, the pressure relief branch pipe includes a capillary section and a pressure relief valve section. One end of the capillary section is connected to the exhaust pipe, and the other end of the capillary section is connected to one end of the pressure relief valve section. The other end of the pressure relief valve section is connected to the low-pressure tank.

[0107] Fifthly, please refer to Figure 15. This application embodiment also provides a sensor device 5, including a sensor 501 and a piping assembly 1 as described in any of the above embodiments. One end of the second piping 30 is connected to the transition pipe 20, and the other end of the second piping 30 is connected to the sensor 501. The sensor 501 is one of a temperature sensor and a pressure sensor.

[0108] Sixthly, please refer to Figure 15. This application embodiment also provides a pressure switch device 6, including a pressure switch 601 and a piping assembly 1 as described in any of the above embodiments. One end of the second piping 30 is connected to the transition pipe 20, and the other end of the second piping 30 is connected to the pressure switch 601.

[0109] Seventhly, this application also provides a heating, ventilation, and air conditioning (HVAC) system, including an outdoor unit, an indoor unit, gas pipes, liquid pipes, and a piping assembly 1 as described in any of the above embodiments. The gas pipes and liquid pipes connect the indoor unit and the outdoor unit. The indoor unit, outdoor unit, gas pipes, liquid pipes, and piping assembly 1 together form a refrigerant circulation loop. The piping assembly 1 is installed in or inside the outdoor unit. The outdoor unit and indoor unit are connected via gas pipes and liquid pipes. Refrigerant flows in the refrigerant circulation loop. The flow direction of the refrigerant in the loop is changed by opening and closing the gas pipes and liquid pipes, thereby enabling the normal operation of the HVAC system. The HVAC system includes, but is not limited to, air conditioning, multi-split systems, heat pumps, and other systems used for heating or cooling; this application does not limit this type of system.

Claims

1. A piping assembly configured as a refrigerant circulation loop in a heating, ventilation, and air conditioning (HVAC) system, wherein, include: The first piping is formed of steel and is configured as a partial loop of the refrigerant circulation loop. The first piping forms a main pipe wall of the partial refrigerant circulation loop and a plug hole formed by a side flange of the main pipe wall. The plug hole has an inner wall and an outer wall. The axial length of the inner wall is greater than the axial length of the outer wall. The inner wall is connected to the inner wall of the main pipe wall, and the outer wall is connected to the outer wall of the main pipe wall. The main component material of the inner wall and the outer wall is the same as the main component material of the first piping. A transition connector, wherein the diameter of the transition connector is smaller than the diameter of the main pipe wall, and the opposite ends of the transition connector are defined as a first port and a second port, respectively. The first port is inserted into the inner wall or the outer wall and is connected to a portion of the refrigerant circulation loop formed by the first piping. The main component material of the transition connector is different from the main component material of the inner wall and the outer wall; and, The second piping has a diameter smaller than that of the main pipe wall. The second piping has a connecting pipe wall that is plugged into the second port. The second piping is connected to the refrigerant circulation loop of the first piping via the transition pipe. The main component material of the connecting pipe wall is the same as that of the transition pipe.

2. The piping assembly according to claim 1, wherein, The second piping includes a connecting branch pipe and an extension branch pipe. The connecting branch pipe and the extension branch pipe are connected integrally or separately. The inner or outer wall of the connecting branch pipe is constructed as the connecting pipe wall. The end of the extension branch pipe away from the connecting branch pipe is connected to a third piping. The main component material of the third piping is one of stainless steel, copper, copper alloy, aluminum, or aluminum alloy.

3. The piping assembly according to claim 2, wherein, The connecting branch pipe and the extending branch pipe are integrally formed, and the connecting branch pipe and the extending branch pipe are arranged along the extension direction of the second piping. The end of the connecting branch pipe is connected to the end of the extending branch pipe.

4. The piping assembly according to claim 2, wherein, The connecting branch pipe and the extension branch pipe are separate components. One end of the extension branch pipe is inserted into the connecting branch pipe, and the outer wall of the extension branch pipe is connected to the inner wall of the connecting branch pipe.

5. The piping assembly according to claim 4, wherein, The extension branch is provided with a first positioning part, which abuts against the end of the connecting branch.

6. The piping assembly according to claim 5, wherein, The extension pipe includes a first DC section and a second DC section. The first DC section is inserted into the connecting pipe and connected to the connecting pipe. The diameter of the second part is larger than the diameter of the first DC section. The first positioning part includes a first variable diameter inclined surface, which is located between the first DC segment and the second DC segment, and is connected to both the first DC segment and the second DC segment.

7. The piping assembly according to claim 2, wherein, The connecting pipe is provided with a second positioning part, which abuts against the second port of the transition pipe.

8. The piping assembly according to claim 7, wherein, The second positioning part includes a first protrusion, which is disposed on the outer peripheral sidewall of the connecting branch pipe and protrudes in a direction away from the pipe axis of the connecting branch pipe.

9. The piping assembly according to claim 1, wherein, The transition connector is provided with a third positioning part, which is located near the first port and abuts against the end of the insertion hole away from the main pipe wall.

10. The piping assembly according to claim 9, wherein, The transition connector includes a third DC section and a fourth DC section. The third DC section is connected to the inner hole wall or the outer hole wall. The fourth DC section is located on the side of the insertion hole away from the main pipe wall. The diameter of the fourth DC section is larger than the diameter of the third DC section. The third positioning part includes a second variable diameter inclined surface, which is located between the third DC segment and the fourth DC segment, and is connected to both the third DC segment and the fourth DC segment.

11. The piping assembly according to claim 9, wherein, The third positioning part includes a second protrusion, which is circumferentially disposed on the outer peripheral sidewall of the transition pipe and protrudes in a direction away from the pipe axis of the transition pipe.

12. The piping assembly of claim 10, wherein, The transition pipe is also provided with a fourth positioning part, which is spaced apart from the third positioning part, and the fourth positioning part abuts against the end of the second pipe.

13. The piping assembly according to claim 12, wherein, The transition connector further includes a fifth DC section, which is connected to the fourth DC section and is connected to the connecting pipe wall. The diameter of the fifth DC section is larger than that of the fourth DC section. The fourth positioning part includes a third variable diameter inclined surface, which is located between the fourth DC segment and the fifth DC segment, and is connected to both the fourth DC segment and the fifth DC segment.

14. The piping assembly of claim 12, wherein, The fourth positioning part includes a third protrusion, which is disposed on the inner peripheral sidewall of the transition pipe and protrudes towards the pipe axis of the transition pipe.

15. The piping assembly according to claim 1, wherein, The axial length of the outer hole wall is L1, where 0.5mm < L1 < 2mm.

16. The piping assembly according to claim 1, wherein, The first port is inserted into the plug hole, and the distance between the end of the first port and the main pipe wall along the hole axis direction is L2, where 1mm < L2 < 10mm.

17. The piping assembly according to claim 1, wherein, The depth to which the end of the second conduit is inserted into the second port is L3, where 5mm < L3 < 20mm.

18. The piping assembly according to claim 1, wherein, The distance between the second port and the end of the plug hole away from the main pipe wall is L4, where 5mm < L4 < 300mm.

19. The piping assembly according to claim 1, wherein, The end of the second conduit is inserted into the transition pipe and overlaps with the inner wall of the conduit. The distance between the end of the second conduit and the end of the insertion hole away from the main pipe wall is L5, where 0mm < L5 < 10mm.

20. A heat exchange device, wherein, The device includes a heat exchanger body, a compressor, and a piping assembly as described in any one of claims 1 to 19, wherein the compressor is connected to the heat exchanger body, the first piping is configured as a manifold and connected to the exhaust side of the compressor, and a plurality of insertion holes are formed by flanges from the main wall side of the first piping, and the plurality of insertion holes are arranged in a row along the axial direction of the first piping. The piping assembly includes multiple transition pipes and multiple second pipes. The multiple transition pipes are inserted into the multiple insertion holes in a one-to-one correspondence. The multiple second pipes are inserted into the multiple transition pipes in a one-to-one correspondence. The multiple second pipes are constructed as heat exchange tubes of the heat exchange body and are configured to exchange heat with an external heat source.

21. A filling device, wherein, The system includes a charging valve and a piping assembly as described in any one of claims 1 to 19, wherein the end of the second piping away from the transition connector is connected to the charging valve, the charging valve being configured to accept external refrigerant charging in the open state, the first piping being configured as an outdoor unit low-pressure side outlet in the refrigerant circulation loop, one axial port of the outdoor unit low-pressure side outlet being connected to a low-pressure side shut-off valve of the outdoor unit in the refrigerant circulation loop, and the other axial port of the outdoor unit low-pressure side outlet being connected to a four-way reversing valve of the outdoor unit in the refrigerant circulation loop.

22. A pressure relief device, wherein, Includes the piping assembly as described in any one of claims 1 to 19, wherein the first piping is configured as an exhaust pipe, one axial port of the exhaust pipe is connected to the exhaust port of the compressor in the refrigerant circulation loop, and the other axial port of the exhaust pipe is connected to a four-way reversing valve of the outdoor unit in the refrigerant circulation loop. The second piping is configured as a pressure relief branch pipe, one of the axial ports of which is plugged into the transition pipe, and the other axial port of which is connected to the low-pressure tank in the refrigerant circulation loop; The pressure relief branch pipe is equipped with a pressure relief valve, which has a preset pressure relief threshold. When the pressure in the exhaust pipe exceeds the pressure relief threshold, the pressure relief valve opens, and the pressure relief branch pipe guides part of the refrigerant to the low-pressure tank in the refrigerant circulation loop.

23. The pressure relief device according to claim 22, wherein, The pressure relief branch pipe includes a capillary section and a pressure relief valve section. One end of the capillary section is connected to the exhaust pipe, and the other end of the capillary section is connected to one end of the pressure relief valve section. The other end of the pressure relief valve section is connected to the low-pressure tank.

24. A sensor device, wherein, Includes a sensor and a piping assembly as described in any one of claims 1 to 19, wherein one end of the second piping is connected to the transition connector and the other end of the second piping is connected to the sensor, wherein the sensor is one of a temperature sensor and a pressure sensor.

25. A pressure switch device, wherein, Includes a pressure switch and a piping assembly as described in any one of claims 1 to 19, wherein one end of the second piping is connected to the transition pipe and the other end of the second piping is connected to the pressure switch.

26. A heating, ventilation, and air conditioning system, wherein, It includes an outdoor unit, an indoor unit, a gas pipe, a liquid pipe, and a piping assembly as described in any one of claims 1 to 19, wherein the gas pipe and the liquid pipe together connect the indoor unit and the outdoor unit, and the indoor unit, the outdoor unit, the gas pipe, the liquid pipe, and the piping assembly together form the refrigerant circulation loop, and the piping assembly is disposed in the outdoor unit or inside the outdoor unit.

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