Piping assembly, device comprising same and heating and ventilation system

Abstract

The utility model discloses a piping assembly, a device comprising the piping assembly and a heating and ventilation system, the piping assembly comprises a first piping, a copper connecting pipe and a second piping, the first piping made of steel is provided with a main pipe wall and an inserting hole formed by flanging in the side direction of the main pipe wall, and the main pipe wall forms part of a refrigerant circulation loop; the axial length of the inner hole wall of the insertion hole is greater than that of the outer hole wall; a first port of the transition connecting pipe is in insertion fit with the insertion hole, and main component materials of the transition connecting pipe and the first piping are different; the second piping is provided with a connecting pipe wall matched with the second port in an inserted mode, and the connecting pipe wall and the transition connecting pipe are made of the same main component material. According to the pipe assembly, the insertion hole formed by the flanging is formed in the wall of the main pipe, the connection contact area between the transition connection pipe and the first pipe is increased, the connection reliability of the transition connection pipe and the first pipe is improved, the preparation material of the pipe assembly is limited and improved, the connection strength of the pipe assembly is improved, and the leakage risk of the pipe assembly is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner accessories, in particular to a pipe assembly, a heat exchange device, a charging device, a pressure relief device, a sensor device, a pressure switch device and a heating and ventilation system comprising the pipe assembly. BACKGROUND

[0002] In the heating and ventilation system, the pipeline of the compressor needs to be connected through multiple pipes to form a loop for the circulation of heat exchange medium. Different pipes can be connected by pipe joints or pipe connection structures during assembly and arrangement. In order to avoid leakage of the heat exchange medium in the pipes, the connection between the pipes needs to ensure good sealing performance.

[0003] In the related art, in order to control the cost of raw materials, some large-diameter pipes can be made of stainless steel. However, due to the material of the stainless steel pipe, the corrosion resistance of the connection between the stainless steel pipes at the pipe turning position is low, and leakage is prone to occur. CONTENT OF THE INVENTION

[0004] The present application provides a pipe assembly, a heat exchange device, a charging device, a pressure relief device, a sensor device, a pressure switch device and a heating and ventilation system comprising the pipe assembly, which can reduce the probability of leakage of the pipe assembly.

[0005] In a first aspect, the present application provides a pipe assembly, comprising:

[0006] A first pipe formed of steel, the first pipe being configured as part of the refrigerant circulation loop, the first pipe forming a main pipe wall of the part of the refrigerant circulation loop and a plug-in hole formed by a lateral flange from the main pipe wall, the plug-in hole forming an inner hole wall and an outer hole wall, an axial length of the inner hole wall being greater than an axial length of the outer hole wall, the inner hole wall being connected to an inner wall surface of the main pipe wall, the outer hole wall being connected to an outer wall surface of the main pipe wall, and the main component material of the inner hole wall and the outer hole wall being the same as the main component material of the first pipe;

[0007] A transition pipe, the pipe diameter of the transition pipe being smaller than the pipe diameter of the main pipe wall, opposite ends of the transition pipe being defined as a first port and a second port, respectively, the first port being plug-in matched with the inner hole wall or the outer hole wall and being in communication with the part of the refrigerant circulation loop formed by the first pipe, and the main component material of the transition pipe being different from the main component material of the inner hole wall and the outer hole wall;

[0008] A second pipe having a pipe diameter smaller than a pipe diameter of the main pipe wall, the second pipe having a connecting pipe wall that is insertedly fitted to the second port, the second pipe being in communication with the refrigerant circulation circuit via the transition pipe forming part of the first pipe, a main component material of the connecting pipe wall being the same as a main component material of the transition pipe.

[0009] In some embodiments of the present application, the second pipe includes a connecting sub-pipe and an extending sub-pipe, the connecting sub-pipe being integrally connected to or separately connected to the extending sub-pipe, and an inner pipe wall or an outer pipe wall of the connecting sub-pipe being configured as the connecting pipe wall, an end of the extending sub-pipe away from the connecting sub-pipe being connected to a third pipe, a main component material of the third pipe being one of stainless steel, copper, copper alloy, aluminum, or aluminum alloy.

[0010] In some embodiments of the present application, the connecting sub-pipe and the extending sub-pipe are integrally provided, and the connecting sub-pipe and the extending sub-pipe are arranged along an extending direction of the second pipe, and an end of the connecting sub-pipe is connected to an end of the extending sub-pipe.

[0011] In some embodiments of the present application, the connecting sub-pipe and the extending sub-pipe are separately provided, one end of the extending sub-pipe being inserted into the connecting sub-pipe, and an outer wall of the extending sub-pipe being connected to an inner wall of the connecting sub-pipe.

[0012] In some embodiments of the present application, a first positioning portion is provided on the extending sub-pipe, the first positioning portion being in abutment with the end of the connecting sub-pipe.

[0013] In some embodiments of the present application, the extending sub-pipe includes a first straight section and a second straight section, the first straight section being inserted into and connected to the connecting sub-pipe, and a diameter of the second straight section being greater than a diameter of the first straight section; wherein the first positioning portion includes a first variable-diameter inclined surface, the first variable-diameter inclined surface being located between the first straight section and the second straight section, and being connected to the first straight section and the second straight section.

[0014] In some embodiments of the present application, a second positioning portion is provided on the connecting sub-pipe, the second positioning portion being in abutment with the second port of the transition pipe.

[0015] In some embodiments of the present application, the second positioning portion includes a first protruding portion, the first protruding portion being provided on an outer peripheral side wall of the connecting sub-pipe, and the first protruding portion being protrudingly provided away from a pipe axis direction of the connecting sub-pipe.

[0016] In some embodiments of the present application, a third positioning portion is provided on the transition pipe, the third positioning portion being provided close to the first port, and being in abutment with an end of the insertion hole away from the main pipe wall.

[0017] In some embodiments of the application, the transition connector includes a third straight section and a fourth straight section, the third straight section is connected with the inner hole wall or the outer hole wall, the fourth straight section is located at a side of the insertion hole away from the first pipe, and a diameter of the fourth straight section is greater than a diameter of the third straight section; the third positioning part includes a second variable-diameter slope, the second variable-diameter slope is located between the third straight section and the fourth straight section, and is connected with the third straight section and the fourth straight section.

[0018] In some embodiments of the application, the third positioning part includes a second protrusion, the second protrusion is annularly arranged on an outer circumferential wall of the transition connector, and the second protrusion is protrudingly arranged away from a pipe axis of the transition connector.

[0019] In some embodiments of the application, the transition connector further includes a fourth positioning part, the fourth positioning part is arranged at an interval from the third positioning part, and the fourth positioning part is in abutment with an end of the second pipe.

[0020] In some embodiments of the application, the transition connector further includes a fifth straight section, the fifth straight section is connected with the fourth straight section, and the fifth straight section is connected with the connection pipe wall, and a diameter of the fifth straight section is greater than a diameter of the fourth straight section; the fourth positioning part includes a third variable-diameter slope, the third variable-diameter slope is located between the fourth straight section and the fifth straight section, and is connected with the fourth straight section and the fifth straight section.

[0021] In some embodiments of the application, the fourth positioning part includes a third protrusion, the third protrusion is arranged on an inner circumferential wall of the transition connector, and the third protrusion is protrudingly arranged towards the pipe axis of the transition connector.

[0022] In some embodiments of the application, an axial length of the outer hole wall is L1, and 0.5mm

[0023] In some embodiments of the application, the first port is inserted into the insertion hole, and a distance between an end of the first port and the main pipe wall along a hole axis of the insertion hole is L2, and 1mm

[0024] In some embodiments of the application, a depth of insertion of the end of the second pipe into the second port is L3, and 5mm

[0025] In some embodiments of the application, a distance between the second port and an end of the insertion hole away from the main pipe wall is L4, and 5mm

[0026] In some embodiments of the present application, the end of the second pipe is inserted into the transition connector and is arranged in overlap with the inner hole wall, and the distance between the end of the second pipe and the end of the main pipe wall away from the insertion hole is L5, wherein 0mm < L5 < 10mm.

[0027] In a second aspect, the embodiments of the present application also provide a heat exchange device, comprising a heat exchange main body, a compressor, and the pipe assembly as described in any of the above embodiments, the compressor being connected with the heat exchange main body, the first pipe being configured as a header pipe and being connected with the exhaust side of the compressor, a plurality of insertion holes being formed by flanging the side of the main pipe wall of the first pipe, and the plurality of insertion holes being arranged in a row along the axial direction of the first pipe.

[0028] The pipe assembly comprises a plurality of transition connectors and a plurality of second pipes, the plurality of transition connectors and the plurality of insertion holes being one-to-one correspondingly inserted and matched, the plurality of second pipes and the plurality of transition connectors being one-to-one correspondingly inserted and matched, and the plurality of second pipes being configured as heat exchange pipes of the heat exchange main body and being used for heat exchange with external heat sources.

[0029] In a third aspect, the embodiments of the present application also provide a charging device, comprising a charging valve and the pipe assembly as described in any of the above embodiments, the end of the second pipe away from the transition connector being connected with the charging valve, the charging valve in an open state being used for receiving external refrigerant charging, the first pipe being configured as an outdoor unit low-pressure side outlet pipe in a refrigerant circulation loop, one axial end port of the outdoor unit low-pressure side outlet pipe being connected with a low-pressure side stop valve of an outdoor unit in the refrigerant circulation loop, and the other axial end port of the outdoor unit low-pressure side outlet pipe being connected with a four-way reversing valve of the outdoor unit in the refrigerant circulation loop.

[0030] In a fourth aspect, the embodiments of the present application also provide a pressure relief device, characterized in that the device comprises the pipe assembly as described in any of the above embodiments, the first pipe being configured as an exhaust pipe, one axial end port of the exhaust pipe being connected with an exhaust port of a compressor in a refrigerant circulation loop, and the other axial end port of the exhaust pipe being connected with a four-way reversing valve of an outdoor unit in the refrigerant circulation loop.

[0031] The second pipe is configured as a pressure relief branch pipe, one axial end port of the pressure relief branch pipe being inserted and matched with the transition connector, and the other axial end port of the pressure relief branch pipe being connected with a low-pressure tank in the refrigerant circulation loop.

[0032] The pressure relief branch pipe is provided with a pressure relief valve, and the pressure relief valve has a preset pressure relief threshold value. When the pressure in the exhaust pipe exceeds the pressure relief threshold value, the pressure relief valve is opened, and the pressure relief branch pipe guides the flow of the refrigerant to the low-pressure tank in the refrigerant circulation loop.

[0033] In some embodiments of the present application, the pressure relief branch pipe comprises a capillary tube part and a pressure relief valve pipe part. One end of the capillary tube part is connected to the exhaust pipe, the other end of the capillary tube part is connected to one end of the pressure relief valve pipe part, and the other end of the pressure relief valve pipe part is connected to the low-pressure tank.

[0034] In a fifth aspect, the embodiments of the present application further provide a sensor device, characterized in that the sensor device comprises a sensor and the pipe assembly as described in any of the above embodiments. One end of the second pipe is connected to the transition pipe, and the other end of the second pipe is connected to the sensor. The sensor is one of a temperature sensor and a pressure sensor.

[0035] In a sixth aspect, the embodiments of the present application further provide a pressure switch device, characterized in that the pressure switch device comprises a pressure switch and the pipe assembly as described in any of the above embodiments. One end of the second pipe is connected to the transition pipe, and the other end of the second pipe is connected to the pressure switch.

[0036] In a seventh aspect, the embodiments of the present application further provide a heating and ventilation system, characterized in that the heating and ventilation system comprises an outdoor unit, an indoor unit, a gas pipe, a liquid pipe, and the pipe assembly as described in any of the above embodiments. The gas pipe and the liquid pipe are connected to the indoor unit and the outdoor unit. The indoor unit, the outdoor unit, the gas pipe, the liquid pipe, and the pipe assembly form the refrigerant circulation loop. The pipe assembly is arranged in the outdoor unit or in the indoor unit.

[0037] Based on the pipe assembly, the heat exchange device, the charging device, the pressure relief device, the sensor device, the pressure switch device, and the heating and ventilation system comprising the pipe assembly, the embodiments of the present application increase the connection contact area between the transition pipe and the first pipe by arranging the plug-in hole formed by the flange on the main pipe wall of the first pipe and connecting the plug-in hole of the flange and the second pipe through the transition pipe. The hole wall of the plug-in hole is in contact with the transition pipe, thereby improving the connection reliability of the transition pipe and the first pipe. Meanwhile, the connection surface of the second pipe and the transition pipe is made of one of copper, copper alloy, aluminum, and aluminum alloy, thereby further improving the connection strength and reliability of the pipe assembly and reducing the leakage risk of the pipe assembly. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0039] Figure 1 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0040] Figure 2 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0041] Figure 3 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0042] Figure 4 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0043] Figure 5 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0044] Figure 6 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0045] Figure 7 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0046] Figure 8 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0047] Figure 9 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0048] Figure 10 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0049] Figure 11 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0050] Figure 12 Structure schematic diagram of a pipe assembly in an embodiment of the present application; Figure 11 Enlarged structure schematic diagram of A in the above figure;

[0051] Figure 13 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0052] Figure 14 Structure schematic diagram of a pipe assembly in an embodiment of the present application;

[0053] Figure 15 Fig. 1 is a schematic view of a structure of a sensor device and a pressure switch device according to an embodiment of the present application.

[0054] Reference signs:

[0055] 1, pipe assembly; 10, first pipe; 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 straight section; 24, fourth straight section; 25, fifth straight section; 30, second pipe; 31, connection branch pipe; 32, extension branch pipe; 321, first straight section; 322, second straight section; 33, connection pipe wall; 41, first positioning portion; 42, second positioning portion; 43, third positioning portion; 44, fourth positioning portion; 2, heat exchange device; 201, heat exchange main body; 202, four-way reversing valve; 3, charging device; 301, charging valve; 4, pressure relief device; 401, pressure relief valve; 5, sensor device; 501, sensor; 6, pressure switch device; 601, pressure switch. DETAILED DESCRIPTION

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0057] In the related art, in order to control the raw material cost, some pipe assemblies with large pipe diameters in air conditioners can be made of stainless steel material. However, due to the material of the steel pipe, the corrosion resistance of the connection between the pipe assemblies at the pipe turning position is low, and leakage phenomenon is prone to occur.

[0058] In view of the above situation, in a first aspect, referring to Figures 1-3 , the present application provides a pipe assembly 1 comprising a first pipe 10, a transition pipe 20 and a second pipe 30.

[0059] As shown in Figure 3 , the first pipe 10 is configured as part of a refrigerant circulation loop, so the first pipe 10 can be used to provide a circulation flow path for the refrigerant, the first pipe 10 forms a main pipe wall 11 of part of the refrigerant circulation loop, and an insertion hole 12 formed by flanging laterally from the main pipe wall 11, a flange structure is provided at the side of the main pipe wall 11, so that the end of the transition pipe 20 can be better connected with the main pipe wall 11, reducing the gap generated when the transition pipe 20 is connected with the main pipe wall 11.

[0060] The plug hole 12 is formed with an inner hole wall 121 and an outer hole wall 122, and the axial length of the inner hole wall 121 is greater than the axial length of the outer hole wall 122, wherein 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, and the other end of the inner hole wall 121 is flush with the other end of the outer hole wall 122, so 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.

[0061] like Figure 2 As shown, the opposite ends of the transition pipe 20 are defined as a first port 21 and a second port 22, respectively. The first port 21 is plugged into the plug hole 12 and is connected to a portion of the refrigerant circulation loop formed by the first pipe 10, wherein the first port 21 can be connected to the inner hole wall 121 or the outer hole wall 122. Preferably, 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 second pipe 30 has a connecting pipe wall 33, and the second port 22 is plugged into the connecting pipe wall 33. The second pipe 30 is connected to a portion of the refrigerant circulation loop formed by the first pipe 10 via the transition pipe 20.

[0062] Among them, the first piping 10 is formed of steel, which can reduce the production cost of the piping assembly 1. The main component material of the inner hole wall 121 and the outer hole wall 122 is the same as the main component material of the first piping 10, that is, the main component material of the inner hole wall 121 and the outer hole wall 122 are both steel; the main component material of the transition pipe 20 is different from the main component material of the inner hole wall 121 and the outer hole wall 122, that is, the main component material of the transition pipe 20 is not steel, and 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 the main component material of the transition pipe 20, and the main component material of the connecting pipe wall 33 and the transition pipe 20 is 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 piping 30 is made of copper, thereby improving the reliability of the connection between the second piping 30 and the transition pipe 20 and reducing the probability of leakage of the piping assembly 1; the other parts of the second piping 30 except the connecting pipe wall 33 can be made of stainless steel.

[0063] Specifically, the second pipe 30 can be used as a service port for installing functional components such as pressure sensors, valves, etc., and can also be used for filling refrigerant. Therefore, the pipe diameter of the transition pipe 20 and the pipe diameter of the second pipe 30 are both smaller than the pipe diameter of the main pipe wall 11, so as to control the flow rate of the refrigerant flowing in the main pipe wall 11 into the transition pipe 20 and the second pipe 30, and to enable the second pipe 30 to be better connected with external functional components, reduce the contact area at the connection, and reduce the probability of leakage in the pipe assembly 1. By reducing the contact area at the connection and reducing the probability of leakage in the pipe assembly 1.

[0064] It should be noted that the transition pipe 20 is made of one of copper, copper alloy, aluminum or aluminum alloy, so the connection between the transition pipe 20 and the first pipe 10 and the second pipe 30 is more reliable, and the probability of leakage of the pipe assembly 1 can be reduced. In the embodiment, the plug-in hole 12 is formed by the flange on the main pipe wall 11 of the first pipe 10, and the plug-in hole 12 and the second pipe 30 are connected by the transition pipe 20. The inner hole wall 121 of the plug-in hole 12 is in contact with the transition pipe 20, thereby increasing the connection contact area between the transition pipe 20 and the first pipe 10, improving the connection reliability of the transition pipe 20 and the first pipe 10. At the same time, the connection surface between the second pipe 30 and the transition pipe 20 is made of one of copper, copper alloy, aluminum or aluminum alloy, further improving the connection strength and reliability of the pipe assembly 1 and reducing the risk of leakage of the pipe assembly 1.

[0065] In some embodiments, the first port 21 is inserted into the plug-in hole 12, that is, the first port 21 is connected with the inner hole wall 121 of the plug-in hole 12. The wall surface of the plug-in hole 12 extends outward along the hole axis direction of 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-in hole 12 more convenient, and reducing the length of the transition pipe 20 inserted into the inside of the main pipe wall 11, thereby reducing the noise emitted by the pipe assembly 1 during operation.

[0066] Please refer to Figure 2 In some embodiments of the present application, the axial length of the outer hole wall 122 is L1, and L1 satisfies 0.5mm < L1 < 2mm, for example, L1 can be 1.3mm. Therefore, the outer hole wall 122 has sufficient height for connection with the transition pipe 20, and can ensure that the transition pipe 20 and the outer hole wall 122 have sufficient welding strength and reliability, thereby reducing the risk of leakage when the transition pipe 20 is connected with the outer hole wall 122.

[0067] As Figure 2As shown, the first port 21 of the transition pipe 20 is inserted into the insertion hole 12, and the distance between the end of the first port 21 and the main pipe wall 11 along the hole axis direction of the insertion hole 12 is L2, that is, the insertion depth of the transition pipe 20 into the insertion hole 12 is L2, and L2 satisfies 1mm < L1 < 10mm, for example, L2 can be 5mm. When the insertion depth L2 of the transition pipe 20 is less than 1mm, the insertion depth of the transition pipe is insufficient, which is easy to cause the insufficient penetration between the transition pipe 20 and the insertion hole 12, thereby affecting the reliability of the connection of the pipe assembly 1; when the insertion depth L2 of the transition pipe 12 is greater than 10mm, the noise of the pipe assembly 1 will be too large.

[0068] The inner hole 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, and the first solder is placed between the outer wall of the first port 21 and the inner hole wall 121. After the first solder is melted in the furnace and cooled, the outer wall of the first port 21 and the inner hole wall 121 can be welded together, and the peripheral side wall of the first port 21 is welded to the inner hole wall 121 by the first solder, so as to ensure the reliability of the welding.

[0069] As shown in the figure, Figure 2 The end of the second pipe 30 is inserted into the second port 22 to a depth of L3, and L3 satisfies 5mm < L3 < 20mm, for example, L3 can be 7mm. In this way, the second pipe 30 and the transition pipe 20 have sufficient welding strength and reliability, and the risk of leakage when the second pipe 30 is connected to the transition pipe 20 is reduced.

[0070] The second pipe 30 can be connected to the transition pipe 20 by manual brazing, because the second pipe 30 is used as a service port and can be used to install functional components such as pressure sensors and valve bodies, and can be used to fill refrigerant. Similarly, before welding, the end of the second pipe 30 is inserted into the second port 22, the outer diameter of the second pipe 30 can be smaller than the inner diameter of the second port 22, and the second solder is placed between the outer wall of the second pipe 30 and the inner wall of the second port 22. After the second solder is melted by manual flame and cooled, the outer wall of the second pipe 30 and the inner wall of the second port 22 can be welded together, and the peripheral side wall of the second pipe 30 is welded to the inner side wall of the second port 22 by the second solder, so as to ensure the reliability of the welding. In the embodiment, the transition pipe 20 is connected to the first pipe 10 by furnace brazing, and the second pipe 30 is connected to the transition pipe 20 by manual brazing, so that the strength of the second pipe 30 can be prevented from being reduced due to annealing caused by furnace brazing.

[0071] It should be noted that the melting point temperature of the first solder is greater than the melting point temperature 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 welding. At this time, the first solder between the transition pipe 20 and the inner hole wall 121 of the insertion hole 12 does not reach the melting point and remains in a non-melted state, that is, the transition pipe 20 and the inner hole wall 121 of the insertion hole 12 are in a welded fixed state.

[0072] As shown in Figure 2 , the distance between the second port 22 and the end of the insertion hole 12 away from the main pipe wall 11 is L4, that is, the length of the transition pipe 20 exposed to the insertion hole 12 is L4, and L4 satisfies 5mm < L4 < 300mm, for example, L4 can be 15mm, 100mm or 200mm. Thus, the transition pipe 20 has sufficient length to connect the first pipe 10 and the second pipe 30, ensuring that the transition pipe 20 has sufficient length to reduce the probability of cracking during welding with the inner hole wall 121 of the insertion hole 12, and facilitating the operation of welding.

[0073] As shown in Figure 4 , the end of the second pipe 30 is inserted into the transition pipe 20 and overlaps with the inner hole wall 121, and 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.

[0074] It can be understood that the second pipe 30 overlaps with part or all of the inner hole wall 121, and the second pipe 30 and the part of the transition pipe 20 exposed to the insertion hole 12 are both overlapped, which can increase the welding area between the second pipe 30 and the transition pipe 20, thereby improving the welding reliability of the second pipe 30. At the same time, when L5 is greater than 10mm, the noise in the pipe assembly 1 will be too large.

[0075] Please refer to Figures 5-6 , in some embodiments of the present application, the second pipe 30 includes a connecting pipe 31 and an extension pipe 32, the connecting pipe 31 and the extension pipe 32 are integrated or connected separately, and the inner pipe wall or the outer pipe wall of the connecting pipe 31 is configured as a connecting pipe wall 33. For example, the connecting pipe 31 can be a copper pipe, so that the connection between the connecting pipe 31 and the transition pipe 20 is more reliable, reducing the risk of leakage at the connection between the second pipe 30 and the transition pipe 20. Specifically, the material and installation scheme of the second pipe 30 can be selected according to the actual application scene, for example, the connecting pipe 31 is a copper pipe, the extension pipe 32 can be a copper pipe, and the extension pipe 32 can also be a steel pipe; at the same time, the connection form between the connecting pipe 31 and the extension pipe 32 is described in detail below.

[0076] The end of the extension branch pipe 32 away from the connecting branch pipe 31 is connected with a third pipe, and 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 with some functional components. The first pipe 10, the transition pipe 20, the second pipe 30 and the third pipe can jointly constitute part of a refrigerant circulation loop.

[0077] In some embodiments, as shown in Figure 5 , the connecting branch pipe 31 and the extension branch pipe 32 are integrally arranged, and the connecting branch pipe 31 and the extension branch pipe 32 are arranged along the extension direction of the second pipe 30. The end of the connecting branch pipe 31 is connected with the end of the extension branch pipe 32. For example, the second pipe 30 extends vertically, and the connecting branch pipe 31 and the extension branch pipe 32 are also arranged vertically. The connecting branch pipe 31 can be located below the extension 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 and the bottom end of the extension branch pipe 32 are fixed by welding.

[0078] Alternatively, as shown in Figure 6 , the extension branch pipe 32 and the connecting branch pipe 31 are separately arranged. One end of the extension branch pipe 32 is inserted into the connecting branch pipe 31 and connected with the connecting branch pipe 31. The outer wall of the extension branch pipe 32 and the inner wall of the connecting branch pipe 31 are fixed by welding.

[0079] Further, please refer to Figure 6 , in some embodiments of the present application, when one end of the extension branch pipe 32 is inserted into the connecting branch pipe 31 and connected with the connecting branch pipe 31, a first positioning part 41 is arranged on the extension branch pipe 32, and the first positioning part 41 abuts against the end of the connecting branch pipe 31. It can be understood that the first positioning part 41 can determine the relative position between the connecting branch pipe 31 and the extension branch pipe 32, ensure the depth of the extension branch pipe 32 inserted into the connecting branch pipe 31 when the second pipe 30 is installed, and prevent the extension branch pipe 32 from being continuously inserted after the extension branch pipe 32 is inserted to a sufficient depth. The first positioning part 41 provides positioning and limiting functions for the connecting branch pipe 31.

[0080] Further, as shown in Figure 6 , the extension branch pipe 32 includes a first straight section 321 and a second straight section 322. The first straight section 321 is inserted into the connecting branch pipe 31 and connected with the connecting branch pipe 31. The diameter of the second straight section 322 is greater than that of the first straight section 321. The first positioning part 41 includes a first variable-diameter inclined surface (e.g., reference numeral 41 in Figure 6 ). The first variable-diameter inclined surface is located between the first straight section 321 and the second straight section 322, and is connected from the first straight section 321 to the second straight section 322.

[0081] Specifically, the first tapering slope is annular, i.e. the first tapering slope is arranged around the peripheral side of the extension pipe 32, and the first tapering slope is connected from the first straight section 321 to the second straight section 322, i.e. the first tapering slope is inclined from the first straight section 321 to the second straight section 322, and the diameter of the first tapering slope gradually increases in the direction from the first straight section 321 to the second straight section 322, so that the first straight section 321 is inserted into the connection pipe 31 until the first tapering slope abuts against the pipe opening of the connection pipe 31, and the outer diameter of the first tapering slope is greater than the inner diameter of the connection pipe 31, so that the extension pipe 32 cannot continue to be inserted into the connection pipe 31, thereby fixing the relative position between the extension pipe 32 and the connection pipe 31.

[0082] It should be noted that, as Figure 7 (a) shown, the first straight section 321 is inserted into the connection pipe 31, and the first straight section 321 can partially overlap the transition pipe 20, wherein the connection pipe 31 is always located between the first straight section 321 and the transition pipe 20. When the end of the connection pipe 31 is inserted into the transition pipe 20 and overlaps the flange structure 12, at this time the first straight section 321 is inserted into the connection pipe 31, and can also overlap the inner hole wall 121 of the insertion hole 12, of course, as Figure 7 (b) shown, the first straight section 321 can also not overlap the inner hole wall 121 of the insertion hole 12, which can be selected according to actual conditions.

[0083] Please refer to Figures 7-8 In some embodiments of the present application, the connection pipe 31 is provided with a second positioning portion 42, and the second positioning portion 42 abuts against the second port 22 of the transition pipe 20. It can be understood that the second positioning portion 42 can determine the relative position between the transition pipe 20 and the connection pipe 31, ensure the depth of the connection pipe 31 when being inserted into the transition pipe 20 during installation, and prevent the connection pipe 31 from being continuously inserted after the connection pipe 31 is inserted to a sufficient depth, and the second positioning portion 42 provides positioning and limiting functions for the connection pipe 31.

[0084] Further, as Figures 7-8 shown, the second positioning portion 42 includes a first protruding portion (such as Figure 8 marked as 42 in the figure), which is arranged on the outer peripheral wall of the connection pipe 31 and protrudes away from the pipe axis of the connection pipe 31, and when the connection pipe 31 is inserted into the transition pipe 20 until the protruding portion of the first protruding portion abuts against the second port 22 of the transition pipe 20, the connection pipe 31 cannot continue to be inserted into the transition pipe 20, thereby fixing the relative position between the connection pipe 31 and the transition pipe 20.

[0085] Please refer to Figures 8-9In some embodiments of the present application, the transition connector 20 is provided with a third positioning portion 43 which abuts against the end of the flange structure 12. It can be understood that the third positioning portion 43 can determine the relative position between the transition connector 20 and the inner hole wall 121 of the insertion hole 12, guarantee the depth of the transition connector 20 when it is inserted into the insertion hole 12, and after the transition connector 20 is inserted to a sufficient depth, the third positioning portion 43 can also prevent the transition connector 20 from being continuously inserted, and the third positioning portion 43 provides positioning and limiting functions for the transition connector 20. The structure of the third positioning portion 43 can be the same as or different from that of the second positioning portion 42, which will be described below.

[0086] Further, as shown in Figure 9 (a), the transition connector 20 includes a third straight section 21 and a fourth straight section 22, the third straight section 21 is connected to the inner hole wall 121 of the insertion hole 12, and the fourth straight section 22 is located on the side of the insertion hole 12 away from the first pipe 10, and the diameter of the fourth straight section 22 is greater than that of the third straight section 21; the third positioning portion 43 includes a second variable-diameter inclined surface (such as Figure 9 the reference number 43 in (a)), which is located between the third straight section 21 and the fourth straight section 22 and is connected from the third straight section 21 to the fourth straight section 22.

[0087] Specifically, the second variable-diameter inclined surface is annular, that is, it is arranged around the circumferential side of the transition connector 20, and it is connected from the third straight section 21 to the fourth straight section 22, that is, it is inclined from the third straight section 21 to the fourth straight section 22, and the diameter of the second variable-diameter inclined surface increases in the direction from the third straight section 21 to the fourth straight section 22, thereby enabling the third straight section 21 to be inserted into the insertion hole 12 until the second variable-diameter inclined surface abuts against the end of the flange structure 12, and the outer diameter of the second variable-diameter inclined surface is greater than the hole diameter of the insertion hole 12, so that the transition connector 20 cannot be continuously inserted into the first pipe 10, thereby fixing the relative position between the transition connector 20 and the first pipe 10.

[0088] Alternatively, as shown in Figure 8 and Figure 9 (b), the third positioning portion 43 includes a second protrusion (such as Figure 8 the reference number 43 in (b)), which is annular, so it is annularly arranged on the outer circumferential wall of the transition connector 20, and it is protrudingly arranged away from the pipe axis of the transition connector 20, when the first port 21 of the transition connector 20 is inserted into the insertion hole 12 until the protruding part of the second protrusion abuts against the end of the inner hole wall, the transition connector 20 cannot be continuously inserted into the insertion hole 12, thereby fixing the relative position between the transition connector 20 and the main pipe wall 11.

[0089] Please refer to Figure 9In some embodiments of the present application, the transition pipe 20 is further provided with a fourth positioning portion 44, which is spaced apart from the third positioning portion 43 and abuts against the end of the second pipe 30. It is understood that the fourth positioning portion 44 can determine the relative position between the transition pipe 20 and the second pipe 30, ensuring the insertion depth of the second pipe 30 into the transition pipe 20 during installation. Furthermore, once the second pipe 30 has been inserted to a sufficient depth, the fourth positioning portion 44 can prevent further insertion of the second pipe 30, thereby providing positioning and limiting functions for the second pipe 30.

[0090] Similarly, the structure of the fourth positioning portion 44 can be the same as or different from the structure of the third positioning portion 43. Figure 9 As shown in (a), the transition pipe 20 further includes a fifth DC section 23, which is connected to the fourth DC section 22 and is also connected to the second pipe 30. The diameter of the fifth DC section 23 is greater than the diameter of the fourth DC section 22; the fourth positioning portion 44 includes a third diameter-changing slope (such as Figure 9 (a) (label 44), the third diameter-changing inclined surface is located between the fourth DC segment 22 and the fifth DC segment 23, and is connected to the fifth DC segment 23 by the fourth DC segment 22.

[0091] Specifically, the third reducing slope is annular, that is, the third reducing slope is arranged around the circumference of the transition pipe 20, and the third reducing slope is connected to the fifth DC section 23 by the fourth DC section 22, that is, the third reducing slope is inclined from the fourth DC section 22 to the fifth DC section 23, and the diameter of the third reducing slope increases successively from the fourth DC section 22 toward the fifth DC section 23, thereby allowing the second pipe 30 to be inserted into the transition pipe 20 until the end of the second pipe 30 abuts against the third reducing slope. The inner diameter of the third reducing slope is smaller than the diameter of the second pipe 30, so the second pipe 30 cannot continue to be inserted into the transition pipe 20, thereby fixing the relative position between the second pipe 30 and the transition pipe 20.

[0092] Or, as Figure 9 As shown in (b), the fourth positioning portion 44 includes a third protrusion (such as Figure 9 (b) In the figure, the third protrusion is provided on the inner peripheral side wall of the transition pipe 20, and the third protrusion is provided to protrude in the pipe axis direction close to 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.

[0093] In some embodiments, as Figure 9As shown, the transition pipe 20 can simultaneously include the third positioning portion 43 and the fourth positioning portion 44, the third positioning portion 43 and the fourth positioning portion 44 are arranged at intervals on the transition pipe 20, the third positioning portion 43 abuts against the end of the flange structure 12, and the fourth positioning portion 44 abuts against the end of the second pipe 30, thereby fixing the relative installation positions among the first pipe 10, the transition pipe 20, and the second pipe 30.

[0094] As described above, the second positioning portion 42 has the same effect as the fourth positioning portion 44, and in other embodiments, as shown in Figure 8 the second positioning portion 42 is arranged on the connection pipe 31 alone to provide positioning and limiting effects for the connection pipe 31, and in this case, the second positioning portion 42 does not need to be arranged on the transition pipe 20; or, as shown in Figure 10 the fourth positioning portion 44 can also be arranged on the transition pipe 20 alone to provide positioning and limiting effects for the second pipe 30 (the connection pipe 31), and in this case, the second positioning portion 42 does not need to be arranged on the connection pipe 31.

[0095] It should be noted that in any of the above embodiments, the pipe assembly 1 can not be installed with the positioning portion, and only the external tool is used to position and install each pipe; or the pipe assembly 1 can be installed and positioned at any one of the first positioning portion 41, the second positioning portion 42 (the fourth positioning portion 44), and the third positioning portion 43; or the pipe assembly 1 can be installed and positioned in cooperation at any two of the first positioning portion 41, the second positioning portion 42 (the fourth positioning portion 44), and the third positioning portion 43; or the pipe assembly 1 can be installed and positioned in cooperation at all of the first positioning portion 41, the second positioning portion 42 (the fourth positioning portion 44), and the third positioning portion 43.

[0096] In a second aspect, referring to Figures 11-12 The embodiment of the present application also provides a heat exchange device 2, which comprises a heat exchange main body 201, a compressor (not shown in the figure), and the pipe assembly 1 as described in any of the above embodiments, the compressor is connected with the heat exchange main body 201, the first pipe 10 is configured as a manifold, the manifold is connected with the exhaust side of the compressor, the plurality of plug-in holes 12 are formed by flanging the side of the main pipe wall 11 of the first pipe 10, and the plurality of plug-in holes 12 are arranged in a row along the axial direction of the first pipe 10. Wherein, the pipe assembly 1 comprises a plurality of transition pipes 20 and a plurality of second pipes 30, the plurality of transition pipes 20 and the plurality of plug-in holes 12 are one-to-one plug-in cooperation, the plurality of second pipes 30 and the plurality of transition pipes 20 are one-to-one plug-in cooperation, and the plurality of second pipes 30 are configured as heat exchange pipes of the heat exchange main body 201 to exchange heat with an external heat source.

[0097] Specifically, the outdoor unit includes a four-way reversing valve 202, which can be used to switch the flow path of the refrigerant, and the four-way reversing valve 202 includes a valve body and four interfaces in communication with the valve body. The valve body is made of steel material, and the four interfaces are each provided with a copper connecting part. At least one copper connecting part is in communication with the first pipe 10 in one pipe assembly 1. For example, three interfaces in the four-way reversing valve 202 are in communication with three pipe assemblies 1, that is, three copper connecting parts are in communication with three first pipes 10, respectively. The fourth interface can be in communication with a separate copper pipe for the passage of refrigerant.

[0098] In a third aspect, referring to Figure 13 The embodiment of the present application also provides a charging device 3, which includes a charging valve 301 and the pipe assembly 1 as described in any of the above embodiments. The second pipe 30 is connected to the charging valve 301 at an end away from the transition pipe 20. The charging valve 301 in the open state can be used to accept external refrigerant charging. The first pipe 10 is configured as an outdoor unit low-pressure side outlet pipe in a refrigerant circulation loop. One axial port of the outdoor unit low-pressure side outlet pipe is connected to a low-pressure side stop valve of the outdoor unit in the refrigerant circulation loop. The other axial port of the outdoor unit low-pressure side outlet pipe is connected to the four-way reversing valve 202 of the outdoor unit in the refrigerant circulation loop.

[0099] Specifically, the second pipe 30 can be used as a service pipe. The end of the second pipe 30 away from the transition pipe 20 is a service port. The service port is blind when not in use. When needed, the blind end can be removed to facilitate vacuum pumping or refrigerant charging operations from the service port.

[0100] In a fourth aspect, referring to Figure 14 The embodiment of the present application also provides a pressure relief device 4, which includes the pipe assembly 1 as described in any of the above embodiments. The first pipe 10 is configured as an exhaust pipe. One axial port of the exhaust pipe is connected to an exhaust port of a compressor in a refrigerant circulation loop. The other axial port of the exhaust pipe is connected to the four-way reversing valve 202 of the outdoor unit in the refrigerant circulation loop. The second pipe 30 is configured as a pressure relief branch pipe. One axial port of the pressure relief branch pipe is in plug-in cooperation with the transition pipe 20. The other axial port of the pressure relief branch pipe is connected to a low-pressure tank in the refrigerant circulation loop.

[0101] The pressure relief branch pipe is provided with a pressure relief valve 401, which has a preset pressure relief threshold. When the pressure in the exhaust pipe exceeds the preset pressure relief threshold, the pressure relief valve 401 is opened, so that the pressure relief branch pipe can guide part of the refrigerant to the low-pressure tank in the refrigerant circulation loop.

[0102] Specifically, one of the axial ports of the pressure relief branch pipe is in communication with a return pipe on the compressor, one end of the return pipe is in communication with the four-way reversing valve 202 of the outdoor unit, and the other end of the return pipe is in communication with a low-pressure tank in the refrigerant circulation loop, so that the refrigerant pressure inside the pressure relief branch pipe can be discharged to the low-pressure tank and the four-way reversing valve 202 through the return pipe of the compressor.

[0103] In some embodiments of the present application, the pressure relief branch pipe comprises a capillary tube portion and a pressure relief valve pipe portion, one end of the capillary tube portion is connected to the exhaust pipe, the other end of the capillary tube portion is connected to one end of the pressure relief valve pipe portion, and the other end of the pressure relief valve pipe portion is connected to the low-pressure tank.

[0104] In a fifth aspect, referring to Figure 15 The embodiments of the present application also provide a sensor device 5, which comprises a sensor 501 and the pipe assembly 1 as described in any of the above embodiments, one end of the second pipe 30 is connected to the transition pipe 20, and the other end of the second pipe 30 is connected to the sensor 501, and the sensor 501 is one of a temperature sensor and a pressure sensor.

[0105] In a sixth aspect, referring to Figure 15 The embodiments of the present application also provide a pressure switch device 6, which comprises a pressure switch 601 and the pipe assembly 1 as described in any of the above embodiments, one end of the second pipe 30 is connected to the transition pipe 20, and the other end of the second pipe 30 is connected to the pressure switch 601.

[0106] In a seventh aspect, the embodiments of the present application also provide a heating and ventilation system, which comprises an outdoor unit, an indoor unit, a gas pipe, a liquid pipe, and the pipe assembly 1 as described in any of the above embodiments, the gas pipe and the liquid pipe are in common communication with the indoor unit and the outdoor unit, the indoor unit, the outdoor unit, the gas pipe, the liquid pipe, and the pipe assembly 1 jointly form a refrigerant circulation loop, and the pipe assembly 1 is arranged in the outdoor unit or in the outdoor unit. Wherein, the outdoor unit and the indoor unit are in communication through the gas pipe and the liquid pipe, the refrigerant flows in the refrigerant circulation loop, and the flow direction of the refrigerant in the loop is changed by the on-off of the gas pipe and the liquid pipe, thereby realizing the normal work of the heating and ventilation system. Wherein, the heating and ventilation system includes but is not limited to an air conditioner, a multi-connected machine, a heat pump, and other systems for heating or refrigeration, and the embodiments of the present application do not limit this.

[0107] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it is understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0108] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A piping assembly for a refrigerant circulation loop of a heating, ventilation, and air conditioning system, characterized by, The application relates to a refrigerant circulation system, which comprises: a first pipe formed of steel material, the first pipe being configured as a partial circuit of the refrigerant circulation circuit, the first pipe forming a main pipe wall of the refrigerant circulation circuit and a plug-in hole formed by flanging a side of the main pipe wall, the plug-in hole being formed with an inner hole wall and an outer hole wall, an axial length of the inner hole wall being greater than an axial length of the outer hole wall, the inner hole wall being connected with an inner wall of the main pipe wall, the outer hole wall being connected with an outer wall of the main pipe wall, and main component materials of the inner hole wall and the outer hole wall being the same as a main component material of the first pipe; a transition connecting pipe, the transition connecting pipe having a pipe diameter smaller than a pipe diameter of the main pipe wall, opposite ends of the transition connecting pipe being defined as a first port and a second port respectively, the first port being in plug-in cooperation with the inner hole wall or the outer hole wall and being in communication with the refrigerant circulation circuit formed by the first pipe, and a main component material of the transition connecting pipe being different from main component materials of the inner hole wall and the outer hole wall; a second pipe, the second pipe having a pipe diameter smaller than the pipe diameter of the main pipe wall, the second pipe having a connecting pipe wall in plug-in cooperation with the second port, the second pipe being in communication with the refrigerant circulation circuit formed by the first pipe via the transition connecting pipe, and a main component material of the connecting pipe wall being the same as a main component material of the transition connecting pipe.

2. The pipe assembly according to claim 1, wherein The second pipe comprises a connecting branch pipe and an extending branch pipe, the connecting branch pipe being integrally connected with or separately connected with the extending branch pipe, an inner pipe wall or an outer pipe wall of the connecting branch pipe being configured as the connecting pipe wall, and an end of the extending branch pipe away from the connecting branch pipe being connected with a third pipe, the third pipe being made of one of stainless steel, copper, copper alloy, aluminum and aluminum alloy.

3. The pipe assembly of claim 2, wherein, The connecting branch pipe and the extending branch pipe are integrally arranged, and the connecting branch pipe and the extending branch pipe are arranged along an extending direction of the second pipe, and an end of the connecting branch pipe is connected with an end of the extending branch pipe.

4. The pipe assembly according to claim 2, wherein The connecting branch pipe and the extending branch pipe are separately arranged, one end of the extending branch pipe being inserted into the connecting branch pipe, and an outer wall of the extending branch pipe is connected with an inner wall of the connecting branch pipe.

5. The pipe assembly of claim 4, wherein, The extending branch pipe is provided with a first positioning part, and the first positioning part abuts against the end of the connecting branch pipe.

6. The pipe assembly of claim 5, wherein, The extending branch pipe comprises a first straight-through section and a second straight-through section, the first straight-through section being inserted into and connected with the connecting branch pipe, and a diameter of the second straight-through section being greater than a diameter of the first straight-through section. The first positioning part comprises a first variable-diameter inclined surface, the first variable-diameter inclined surface being located between the first straight-through section and the second straight-through section and being connected with the first straight-through section and the second straight-through section.

7. The pipe assembly of claim 2, wherein, The connecting branch pipe is provided with a second positioning part, and the second positioning part abuts against the second port of the transition connecting pipe.

8. The pipe assembly of claim 7, wherein, The second positioning part comprises a first convex part, the first convex part being arranged on an outer circumferential side wall of the connecting branch pipe, and the first convex part being arranged to protrude away from a pipe axis direction of the connecting branch pipe.

9. The pipe assembly of claim 1, wherein, The third positioning part is arranged on the transition pipe, and is arranged close to the first port and abuts against the end of the insertion hole away from the main pipe wall.

10. The pipe assembly of claim 9, wherein, The transition pipe comprises a third straight section and a fourth straight section, the third straight section is connected with the inner hole wall or the outer hole wall, the fourth straight section is located on the side of the insertion hole away from the main pipe wall, and the diameter of the fourth straight section is greater than that of the third straight section. The third positioning part comprises a second variable-diameter inclined surface, which is located between the third straight section and the fourth straight section and connected with both the third straight section and the fourth straight section.

11. The pipe assembly of claim 9, wherein, The third positioning part comprises a second convex part, which is annularly arranged on the outer circumferential wall of the transition pipe, and the second convex part is arranged to protrude away from the pipe axis of the transition pipe.

12. The pipe assembly of claim 10, wherein, The transition pipe further comprises a fourth positioning part, which is arranged at intervals with the third positioning part and abuts against the end of the second pipe.

13. The pipe assembly of claim 12, wherein, The transition pipe further comprises a fifth straight section, which is connected with the fourth straight section and connected with the connecting pipe wall, and the diameter of the fifth straight section is greater than that of the fourth straight section. The fourth positioning part comprises a third variable-diameter inclined surface, which is located between the fourth straight section and the fifth straight section and connected with both the fourth straight section and the fifth straight section.

14. The pipe assembly of claim 12, wherein, The fourth positioning part comprises a third convex part, which is arranged on the inner circumferential wall of the transition pipe and arranged to protrude towards the pipe axis of the transition pipe.

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

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

17. The pipe assembly of claim 1, wherein, The depth of the end of the second pipe inserted into the second port is L3, wherein 5mm < L3 < 20mm.

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

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

20. A heat exchange device, characterized by The heat exchange main body, the compressor and the pipe assembly according to any one of claims 1 to 19 are provided, the compressor is connected with the heat exchange main body, the first pipe is configured as a header and connected with the exhaust side of the compressor, a plurality of insertion holes are formed by flanging the side of the main pipe wall of the first pipe, and the plurality of insertion holes are arranged in a row along the axial direction of the first pipe. The pipe assembly includes a plurality of the transition connectors and a plurality of the second pipes, the plurality of the transition connectors are inserted into the plurality of the insertion holes one by one, the plurality of the second pipes are inserted into the plurality of the transition connectors one by one, and the plurality of the second pipes are configured as heat exchange pipes of the heat exchange main body for heat exchange with an external heat source.

21. A charging device characterized by comprising: The pipe assembly includes a charging valve, the end of the second pipe away from the transition connector is connected to the charging valve, the charging valve is used for receiving external refrigerant charging in an open state, the first pipe is configured as an outdoor unit low-pressure side outlet pipe in a refrigerant circulation loop, one axial end of the outdoor unit low-pressure side outlet pipe is connected to a low-pressure side stop valve of an outdoor unit in the refrigerant circulation loop, and the other axial end of the outdoor unit low-pressure side outlet pipe is connected to a four-way reversing valve of the outdoor unit in the refrigerant circulation loop.

22. A pressure relief device characterized by, The pipe assembly includes a charging valve, the end of the second pipe away from the transition connector is connected to the charging valve, the charging valve is used for receiving external refrigerant charging in an open state, the first pipe is configured as an outdoor unit low-pressure side outlet pipe in a refrigerant circulation loop, one axial end of the outdoor unit low-pressure side outlet pipe is connected to a low-pressure side stop valve of an outdoor unit in the refrigerant circulation loop, and the other axial end of the outdoor unit low-pressure side outlet pipe is connected to a four-way reversing valve of the outdoor unit in the refrigerant circulation loop. The second pipe is configured as a pressure relief branch pipe, one axial end of the pressure relief branch pipe is inserted into the transition connector, and the other axial end of the pressure relief branch pipe is connected to a low-pressure tank in the refrigerant circulation loop. The pressure relief branch pipe is provided with a pressure relief valve, the pressure relief valve has a preset pressure relief threshold, when the pressure in the exhaust pipe exceeds the pressure relief threshold, the pressure relief valve is opened, 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 of claim 22, wherein The pressure relief branch pipe includes a capillary tube part and a pressure relief valve pipe part, one end of the capillary tube part is connected to the exhaust pipe, the other end of the capillary tube part is connected to one end of the pressure relief valve pipe part, and the other end of the pressure relief valve pipe part is connected to the low-pressure tank.

24. A sensor device, characterized by The pipe assembly includes a sensor, one end of the second pipe is connected to the transition connector, and the other end of the second pipe is connected to the sensor, the sensor is one of a temperature sensor and a pressure sensor.

25. A pressure switch device, characterized by The pipe assembly includes a pressure switch, one end of the second pipe is connected to the transition connector, and the other end of the second pipe is connected to the pressure switch.

26. A heating and ventilation system, characterised in that The pipe assembly includes an outdoor unit, an indoor unit, a gas pipe, a liquid pipe, and the pipe assembly, the gas pipe and the liquid pipe are connected to the indoor unit and the outdoor unit, the indoor unit, the outdoor unit, the gas pipe, the liquid pipe, and the pipe assembly jointly form the refrigerant circulation loop, and the pipe assembly is arranged in the outdoor unit or in the outdoor unit.

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