Plug assembly, shut-off valve assembly having the same, and heating and ventilation device

Abstract

This utility model provides a plug assembly and a shut-off valve assembly and HVAC device having the same, used to seal one end of a first connecting pipe. The plug assembly includes: a first pipe adapted to connect to the first connecting pipe; and a second pipe, one end of which is closed, and the other end connected to the end of the first pipe opposite to the first connecting pipe; wherein at least one of the first pipe and the second pipe is made of flexible stainless steel. According to the plug assembly of this utility model, by setting one of the first pipe and the second pipe as a flexible stainless steel component, the installation difficulty between the first pipe and the second pipe can be reduced, thereby reducing the assembly time of the HVAC device and lowering production costs; simultaneously, it can also reduce the risk of vibration cracking at the connection between the first pipe and the second pipe, thereby improving the reliability of the HVAC device.

Description

Technical Field

[0001] This utility model relates to the field of HVAC manufacturing technology, and in particular to a plug assembly and a shut-off valve assembly and HVAC device having the plug assembly. Background Technology

[0002] In existing solutions, the plug assembly is usually formed by welding the first pipe and the second pipe together. Due to the limitations of the plug assembly material, when the refrigerant flows inside the plug assembly, the refrigerant will impact the plug assembly. In addition, when the HVAC system is working, the compressor will vibrate, which will reduce the connection reliability at the connection point of the first pipe and the second pipe, and thus affect the reliability of the entire HVAC system. Utility Model Content

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a plug assembly that can reduce the reliability of existing plug assemblies.

[0004] This utility model also proposes a shut-off valve assembly having the above-mentioned plug component.

[0005] This utility model also proposes a heating and ventilation device having the above-mentioned shut-off valve assembly.

[0006] According to an embodiment of the present invention, a plug assembly is used to seal one end of a first connecting pipe. The plug assembly includes: a first pipe adapted to be connected to the first connecting pipe; and a second pipe, one end of which is closed and the other end is connected to the end of the first pipe opposite to the first connecting pipe; wherein at least one of the first pipe and the second pipe is a flexible stainless steel component.

[0007] According to the plug assembly of this utility model, by setting one of the first pipe and the second pipe as a flexible stainless steel component, the installation difficulty between the first pipe and the second pipe can be reduced, thereby reducing the assembly time of the HVAC system and lowering production costs; at the same time, it can also reduce the risk of vibration cracking at the connection between the first pipe and the second pipe, thereby improving the reliability of the HVAC system.

[0008] According to some embodiments of the present invention, the first pipe includes a main pipe and a connecting pipe. One end of the main pipe is adapted to be connected to the first connecting pipe, and the other end of the main pipe has a connecting hole. One end of the connecting pipe is connected to the periphery of the connecting hole, and the other end of the connecting pipe is connected to the second pipe.

[0009] According to some optional embodiments of the present invention, the cross-sectional dimensions of the main pipe are the same in the direction from the main pipe to the connecting pipe, or the cross-sectional dimensions of at least a portion of the main pipe gradually decrease.

[0010] According to some optional embodiments of the present invention, the main pipe section includes: a first straight pipe section and a first tapered pipe section connected in sequence. The first straight pipe section is a circular pipe with a uniform cross-section. The first straight pipe section is adapted to be connected to the first connecting pipe section. In the direction from the first straight pipe section to the first tapered pipe section, the cross-sectional size of the first tapered pipe section gradually decreases. The first tapered pipe section is connected to the connecting pipe section.

[0011] According to some embodiments of the present invention, the first pipe is an integral piece, wherein the first pipe is a flexible stainless steel material piece, and / or the first pipe is a copper piece.

[0012] According to some embodiments of the present invention, the first piping includes: a first pipe and an end cap, the first pipe is a straight pipe, one end of the first pipe is used to connect to a first connecting pipe, the end cap is disposed on the other end of the first pipe, and the connecting pipe portion is formed in the end cap.

[0013] According to some optional embodiments of the present invention, the first tube is a flexible stainless steel material, and / or the end cap is a copper material.

[0014] According to some embodiments of the present invention, the second pipe is an integral piece, and the second pipe is a flexible stainless steel material or a copper material.

[0015] According to some embodiments of the present invention, the second conduit includes: a first branch pipe and a second branch pipe, the first branch pipe being connected to the first conduit, the second branch pipe being connected to the end of the first branch pipe away from the first conduit, and the end of the second branch pipe away from the first branch pipe being closed.

[0016] According to some optional embodiments of the present invention, the first branch pipe is a flexible stainless steel component, and / or the second branch pipe is a copper component.

[0017] According to some embodiments of the present invention, the yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the flexible stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 100-120 Hv.

[0018] According to some embodiments of this utility model, the Md30 of the flexible stainless steel is -50℃ to -80℃.

[0019] According to some embodiments of the present invention, the flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

[0020] According to some embodiments of this utility model, the wall thickness of the flexible stainless steel tube is 1.2mm to 1.5mm.

[0021] According to some embodiments of the present invention, the second conduit is plugged into the second conduit, and the insertion depth of the second conduit is 5mm-20mm.

[0022] According to some embodiments of the present invention, the first pipe and the second pipe are connected by an insertion connection, and the fitting gap between the second pipe and the first pipe is 0.1mm-0.2mm.

[0023] A shut-off valve assembly according to a second aspect of the present invention includes: a shut-off valve having a first interface; a first connecting pipe having one end connected to the first interface of the shut-off valve; and a plug assembly according to a first aspect of the present invention, wherein the first piping is connected to the other end of the first connecting pipe.

[0024] According to the shut-off valve assembly of this utility model, by setting the plug assembly of the first aspect embodiment above, and by setting one of the first pipe and the second pipe as a flexible stainless steel material, the installation difficulty between the first pipe and the second pipe can be reduced, thereby reducing the assembly time of the HVAC system and reducing production costs; at the same time, it can also reduce the risk of cracking at the connection between the first pipe and the second pipe due to vibration, thereby improving the reliability of the HVAC system.

[0025] The HVAC device according to a third aspect of the present invention includes a shut-off valve assembly according to a second aspect of the present invention.

[0026] According to the HVAC device of this utility model, by setting the shut-off valve assembly of the second aspect embodiment above, and setting a plug assembly on the shut-off valve assembly, and by setting one of the first pipe and the second pipe as a flexible stainless steel material, the installation difficulty between the first pipe and the second pipe can be reduced, thereby reducing the assembly time of the HVAC device and reducing production costs; at the same time, it can also reduce the risk of cracking due to vibration at the connection between the first pipe and the second pipe, thereby improving the reliability of the HVAC device.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a shut-off valve assembly according to an embodiment of the present utility model;

[0029] Figure 2 It is along Figure 1 Sectional view of line AA in the middle;

[0030] Figure 3 yes Figure 1 A schematic diagram of a first embodiment of the plug assembly shown;

[0031] Figure 4 This is a schematic diagram of a plug assembly according to a second embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of a plug assembly according to a third embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the plug assembly according to the fourth embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the plug assembly according to the fifth embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram of the welding of the plug assembly;

[0036] Figure 9 for Figure 8 A magnified view of a section at point B.

[0037] Figure label:

[0038] 100. End cap assembly;

[0039] 10. First piping section; 11. Main pipe section; 111. First straight pipe section; 112. First tapered pipe section; 113. Second straight pipe section; 114. Second tapered pipe section; 12. Connecting pipe section;

[0040] 101. First tube; 102. End cap;

[0041] 20. Second branch pipe; 21. First branch pipe; 22. Second branch pipe;

[0042] 200. Stop valve;

[0043] 300. First takeover;

[0044] 1000. Gate valve assembly. Detailed Implementation

[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0046] The following is a reference appendix. Figure 1-9 Description of a plug assembly 100 according to an embodiment of the present utility model.

[0047] Reference Figure 1 , Figure 2 and Figure 3 According to an embodiment of the present invention, the plug assembly 100 is used to seal one end of the first connecting pipe 300 (e.g., Figure 1 The lower end of the first connecting pipe 300 shown includes: a first pipe 10 and a second pipe 20.

[0048] Specifically, the first conduit 10 is adapted to be connected to the first connecting pipe 300; one end of the second conduit 20 (e.g., Figure 3 The lower end of the second pipe 20 shown is closed, and the other end (as shown) is closed. Figure 3 The upper end of the second conduit 20 shown is connected to the end of the first conduit 10 away from the first connecting pipe 300 (e.g., Figure 3 (The lower end of the first pipe 10 shown); wherein at least one of the first pipe 10 and the second pipe 20 is a flexible stainless steel component.

[0049] For example, such as Figure 1 , Figure 2 and Figure 3 As shown, the plug assembly 100 seals the lower end of the first connecting pipe 300, the upper end of the first piping 10 is connected to the lower end of the first connecting pipe 300, and the upper end of the second piping 20 is connected to the lower end of the first piping 10. The first piping 10 and the second piping 20 seal the first connecting pipe 300. Preferably, the first connecting pipe 300 is welded to the first piping 10, and the second piping 20 is welded to the first piping 10. This ensures the connection strength between the first connecting pipe 300 and the first piping 10, and the connection strength between the second piping 20 and the first piping 10.

[0050] Preferably, the flexible stainless steel is a stainless steel material with a copper content of 2-4%. It is understood that stainless steel not only maintains the structural strength of conventional stainless steel, but also has high ductility that conventional stainless steel does not have. This allows the first pipe 10 to fit well even when space is limited or a specific angle is required to connect with the second pipe 20. This reduces the installation difficulty between the first pipe 10 and the second pipe 20, thereby reducing the assembly time and cost of the HVAC system. At the same time, the cost of flexible stainless steel components is lower than that of copper components, thereby reducing the production cost of the plug assembly 100.

[0051] It should be noted that in this embodiment, the stainless steel pipe is composed of the following components and their mass percentages: C: 0%–0.02%, Si: 0%–1%, Mn: 1%–2%, Cr: 16%–18%, Ni: 9%–11%, Cu: 2%–4%, Mo: 0%–0.03%, P: 0%–0.03%, and S: 0%–0.03%. The addition of Cu reduces the yield strength of the stainless steel pipe to 140 MPa–180 MPa, the tensile strength to 400 MPa–600 MPa, increases the elongation to 50%–80%, the yield strength ratio to less than 0.4, and the hardness to 100 Hv–120 Hv. The addition of Cr and Ni gives the stainless steel pipe a lower pitting corrosion potential, lower pitting corrosion weight loss, and a lower martensitic transformation temperature, making it more difficult for the stainless steel pipe to undergo martensitic phase transformation during processing, thereby achieving stronger resistance to pitting corrosion and stress corrosion.

[0052] It should be further explained that the stainless steel pipe involved in this utility model has a lower C element content, which makes it more difficult for it to pass through the material sensitization range during hot working and welding, effectively controlling the formation of M23C6, thereby achieving stronger resistance to intergranular corrosion and effectively reducing welding defects.

[0053] When the plug assembly 100 is connected to the first connecting pipe 300, the second pipe 20 is first welded to the first pipe 10 using the second solder, forming a first weld between the first pipe 10 and the second pipe 20. Then, the first pipe 10 is welded to the first connecting pipe 300 using the first solder, forming a second weld between the first connecting pipe 300 and the first pipe 10. At this point, the plug assembly 100 is complete in sealing the first connecting pipe 300.

[0054] According to the embodiment of the present invention, the plug assembly 100, by setting one of the first pipe 10 and the second pipe 20 as a flexible stainless steel material, can reduce the installation difficulty between the first pipe 10 and the second pipe 20, thereby reducing the assembly time of the HVAC system and reducing production costs; at the same time, it can also reduce the risk of vibration cracking at the connection between the first pipe 10 and the second pipe 20, thereby improving the reliability of the HVAC system.

[0055] According to some embodiments of this utility model, refer to Figure 1 , Figure 2 and Figure 3 The first piping 10 includes: a main pipe section 11 and a connecting pipe section 12, one end of the main pipe section 11 (e.g., Figure 3 The upper end of the main control section 11 shown is adapted to connect to the first connecting pipe 300, and the other end of the main control section 11 (as shown) Figure 3 The lower end of the main pipe 11 shown has a connecting hole, and one end of the connecting pipe 12 (such as...) Figure 3 The upper end of the connecting part 12 shown is connected to the periphery of the connecting hole, and the other end of the connecting part 12 (as shown) Figure 3 The lower end of the connecting pipe 12 shown is connected to the second pipe 20.

[0056] In this way, the main pipe 11 is connected to the first connecting pipe 300, which facilitates the connection of the plug assembly 100 to the first connecting pipe 300. The connecting pipe 12 facilitates the connection of the second piping 20 to the first connecting pipe 300, thereby facilitating the assembly of the second piping 20 and the first piping 10.

[0057] For example, such as Figure 1 , Figure 2 and Figure 3 As shown, the main pipe 11 is vertically arranged in the up-down direction. The upper end of the main pipe 11 is connected to the first connecting pipe 300, and the lower end of the main pipe 11 forms a connecting hole. The upper end of the connecting pipe 12 is connected to the connecting hole, and the lower end of the connecting pipe 12 is connected to the second piping 20.

[0058] According to some optional embodiments of the present invention, refer to Figure 1 , Figure 2 and Figure 3 In the direction from the main section 11 to the connecting section 12, the cross-sectional dimensions of the main section 11 are the same. Therefore, the main section 11 has a structure with a constant cross-section, which facilitates processing and can improve the processing efficiency of the main section 11.

[0059] Furthermore, such as Figure 1 and Figure 5As shown, in the direction from the main pipe 11 to the connecting pipe 12, at least a portion of the cross-sectional dimension of the main pipe 11 gradually decreases; that is, either a portion of the main pipe 11 or the entire main pipe 11 gradually decreases in cross-sectional dimension. This gradual decrease in the cross-sectional dimension of the main pipe 11 facilitates the flow of liquids such as refrigerant from the shut-off valve 200 into the connecting pipe 12, effectively preventing liquid from remaining on the surface of the main pipe 11. Simultaneously, the second pipe 20 is connected to the connecting pipe 12, thus reducing the cross-sectional dimension of the second pipe 20 and further lowering the production cost of the plug assembly 100.

[0060] According to some embodiments of this utility model, refer to Figure 1 and Figure 5 The main pipe section 11 includes a first straight pipe section 111 and a first tapered pipe section 112 connected in sequence. The first straight pipe section 111 is a circular pipe with a uniform cross-section. The first straight pipe section 111 is adapted to be connected to the first connecting pipe 300. In the direction from the first straight pipe section 111 to the first tapered pipe section 112, the cross-sectional size of the first tapered pipe section 112 gradually decreases. The first tapered pipe section 112 is connected to the connecting pipe section 12.

[0061] In this way, the first straight pipe section 111 facilitates the connection between the main pipe section 11 and the first connecting pipe 300, thereby ensuring the sealing of the connection between the plug assembly 100 and the first connecting pipe 300. The first tapered pipe section 112 can reduce the material used in the main pipe section 11, thereby reducing the production cost of the plug assembly 100. At the same time, processing the first straight pipe section 111 and the first tapered pipe section 112 separately can reduce the processing difficulty of the main pipe section 11, thereby improving the processing efficiency of the main pipe section 11.

[0062] For example, such as Figure 1 and Figure 5 As shown, the first straight pipe section 111 is located on the upper side of the first tapered pipe section 112. The upper end of the first straight pipe section 111 is connected to the lower side of the first connecting pipe 300. The upper end of the first tapered pipe section 112 is connected to the lower end of the first straight pipe section 111. The lower end of the first tapered pipe section 112 is connected to the connecting pipe section 12.

[0063] Furthermore, such as Figure 1 and Figure 6 As shown, the main pipe section 11 also includes: a second straight pipe section 113 and a second tapered pipe section 114 connected in sequence. The second straight pipe section 113 is a circular pipe with a uniform cross-section. The second straight pipe section 113 is connected to the first tapered pipe section 112. In the direction from the first straight pipe section 111 to the second tapered pipe section 114, the cross-sectional size of the second tapered pipe section 114 gradually decreases. The second tapered pipe section 114 is connected to the connecting pipe section 12.

[0064] In this way, the second straight pipe section 113 can be easily connected to the first tapered pipe section 112. The cross-sectional dimensions of the second straight pipe section 113 are the same as the lower cross-sectional dimensions of the first tapered pipe section 112, thereby ensuring the sealing of the main pipe section 11. The second tapered pipe section 114 can reduce the material used in the main pipe section 11, thereby reducing the production cost of the plug assembly 100. At the same time, processing the second straight pipe section 113 and the second tapered pipe section 114 separately can reduce the processing difficulty of the main pipe section 11, thereby improving the processing efficiency of the main pipe section 11. Furthermore, setting the first tapered pipe section 112 and the second tapered pipe section 114 as having gradually decreasing cross-sectional dimensions can minimize the material used in the main pipe section 11, thereby reducing the production cost of the plug assembly 100.

[0065] For example, such as Figure 1 and Figure 6 As shown, the second straight pipe section 113 is located below the first tapered pipe section 112, and the second straight pipe section 113 is located above the second tapered pipe section 114. The upper end of the second straight pipe section 113 is connected to the lower end of the first tapered pipe section 112, the upper end of the second tapered pipe section 114 is connected to the lower end of the second straight pipe section 113, and the lower end of the second tapered pipe section 114 is connected to the connecting pipe section 12.

[0066] According to some embodiments of this utility model, refer to Figure 1 and Figure 4 The first pipe 10 is a single piece, and it is made of flexible stainless steel. Therefore, the low cost of stainless steel reduces the amount of copper used in the plug assembly 100, further reducing its production cost. Simultaneously, the flexible stainless steel material ensures the strength of the first pipe 10, preventing damage. Furthermore, as... Figure 1 and Figure 4 As shown, the first conduit 10 is made of copper. This facilitates the connection between the first conduit 10 and the first connecting pipe 300, and allows the use of a first solder with a lower melting point to weld the first conduit 10 and the first connecting pipe 300 together.

[0067] According to some embodiments of this utility model, refer to Figure 1 and Figure 7 The first conduit 10 includes: a first pipe 101 and an end cap 102. The first pipe 101 is a straight pipe, and one end of the first pipe 101 (e.g., Figure 7 The upper end of the first tube 101 shown is used to connect to the first connecting pipe 300, and the end cap 102 is placed on the other end of the first tube 101 (e.g., Figure 7The lower end of the first pipe 101 shown has a connecting part 12 formed on the end cap 102. Thus, the first pipe 101 can be easily connected to the first piping 10 and the first connecting part 300. The end cap 102 cooperates with the first pipe 101 to allow the refrigerant flowing into the first pipe 101 to flow into the connecting part 12 through the end cap 102, thereby ensuring the normal flow of refrigerant in the first piping 10.

[0068] For example, such as Figure 1 and Figure 7 As shown, the first pipe 101 is a straight pipe extending in the vertical direction. The upper end of the first pipe 101 is connected to the lower end of the first connecting pipe 300. The end cap 102 is placed on the lower end of the first pipe 101, and the connecting pipe part 12 is formed inside the end cap 102.

[0069] According to some optional embodiments of the present invention, refer to Figure 7 The first tube 101 is made of flexible stainless steel. Therefore, the low cost of stainless steel reduces the amount of copper used in the plug assembly 100, further lowering its production cost. Simultaneously, the flexible stainless steel material ensures the strength of the first tube 101, preventing damage.

[0070] Furthermore, such as Figure 7 As shown, the end cap 102 is made of copper. Copper has good ductility, which facilitates the machining of the end cap 102 and improves its machining efficiency.

[0071] According to some embodiments of this utility model, refer to Figure 1 The second conduit 20 is a single piece, made of flexible stainless steel or copper. This single-piece construction ensures the strength of the second conduit 20 and effectively prevents damage. When the second conduit 20 is made of flexible stainless steel, the low cost of stainless steel reduces production costs. When it is made of copper, its good ductility facilitates processing and improves processing efficiency.

[0072] According to some embodiments of this utility model, refer to Figure 1 , Figure 3 and Figure 5 The second conduit 20 includes: a first branch conduit 21 and a second branch conduit 22. The first branch conduit 21 is connected to the first conduit 10, and the second branch conduit 22 is connected to the end of the first branch conduit 21 that is away from the first conduit 10 (e.g., ...). Figure 3 The lower end of the first branch pipe 21 shown is connected to the second branch pipe 22, the end of which is furthest from the first branch pipe 21 (as shown in the diagram). Figure 3 The lower end of the second branch pipe 22 shown is closed.

[0073] In this way, the second piping 20 and the first piping 10 are set up separately, which reduces the processing difficulty of the second piping 20 and makes the processing of the second piping 20 easier. At the same time, one end of the second branch pipe 22 is closed, which can seal the refrigerant and other liquids flowing from the shut-off valve 200 to the plug assembly 100 inside the plug assembly 100, thereby effectively preventing the refrigerant from leaking from the plug assembly 100.

[0074] For example, such as Figure 1 , Figure 3 and Figure 5 As shown, the upper end of the first branch pipe 21 is connected to the connecting pipe 12, the upper end of the second branch pipe 22 is connected to the lower end of the first branch pipe 21, and the lower end of the second branch pipe 22 is closed.

[0075] According to some optional embodiments of the present invention, refer to Figure 1 , Figure 4 and Figure 5 The first branch pipe 21 is made of flexible stainless steel. Therefore, stainless steel is inexpensive, which further reduces the production cost of the plug assembly 100. At the same time, the flexible stainless steel material ensures the strength of the first branch pipe 21, thus preventing damage to it.

[0076] Furthermore, such as Figure 1 , Figure 3 and Figure 5 As shown, the second branch pipe 22 is made of copper. Copper has good ductility, which facilitates the processing of the second branch pipe 22 and thus improves its processing efficiency.

[0077] According to some embodiments of this utility model, the Md30 of stainless steel is -50℃ to -80℃. In the field of stainless steel materials, "Md30" refers to the critical temperature for martensitic transformation. Specifically, "Md30" is the temperature at which 50% martensite is generated when the deformation is 30%. This parameter is very important for predicting the behavior of stainless steel during processing because the formation of martensite affects the hardness and magnetism of the material. Generally speaking, the lower the "Md30" value, the more difficult it is for the material to form martensite under the same deformation conditions. Therefore, the material has stronger resistance to aging cracking, i.e., it is less prone to cracking. Conversely, if the "Md30" value is high, the material is more likely to generate martensite during processing, which may lead to cracking. Therefore, by ensuring that the critical temperature for the martensitic transformation of stainless steel meets the above conditions, the filter assembly 100 can operate well in low-temperature environments with good stability.

[0078] According to some embodiments of this utility model, the stainless steel is austenitic stainless steel with an average grain size of 20μm to 40μm. Therefore, austenitic stainless steel with a grain size of 20μm to 40μm not only maintains the inherent good corrosion resistance and processability of austenitic stainless steel, but also achieves superior mechanical properties and a potentially longer service life due to grain refinement.

[0079] According to some embodiments of this utility model, the wall thickness of the stainless steel pipe is 1.2mm to 1.5mm, which ensures that the wall thickness is not too small, thus guaranteeing the mechanical strength and compressive strength of the stainless steel pipe. At the same time, it also ensures the ductility of the stainless steel pipe, enabling it to adapt to complex shape changes and bending requirements. Furthermore, it also ensures that the wall thickness is not too large, thereby reducing the cost of the stainless steel pipe and thus reducing the production cost of the entire filter assembly 100.

[0080] According to some embodiments of this utility model, such as Figure 3 As shown, the second conduit 20 is plugged into the first conduit 10, with the insertion depth of the second conduit 20 being 5mm-20mm. This ensures that the insertion depth of the second conduit 20 and the first conduit 10 is not too shallow, which helps to increase the contact area between the two conduits. At the same time, it also ensures that the insertion depth of the second conduit 20 and the first conduit 10 is not too deep, thereby reducing material usage and unnecessary stress concentration, and thus increasing the service life of the filter assembly 100.

[0081] For example, the insertion depth of the second pipe 20 can be 5mm, 10mm, 15mm or 20mm.

[0082] According to some embodiments of this utility model, such as Figure 3 As shown, the second conduit 20 is plugged into the first conduit 10, and the mating clearance between the second conduit 20 and the first conduit 10 is 0.1mm-0.2mm. This ensures that the mating clearance between the second conduit 20 and the first conduit 10 is not too small, thus guaranteeing a smooth and efficient assembly process; at the same time, it also ensures that the mating clearance between the second conduit 20 and the first conduit 10 is not too large, which helps to reduce the material required for sealing the second conduit 20 and the first conduit 10.

[0083] For example, the fitting clearance between the second pipe 20 and the first pipe 10 can be 0.1mm, 0.15mm or 0.2mm.

[0084] According to some embodiments of this utility model, refer to Figure 1 and Figure 2The first conduit 10 and the second conduit 20 are connected by welding with a first solder or a second solder. Therefore, welding the first conduit 10 to the first connecting pipe 300 does not affect the weld between the first conduit 10 and the second conduit 20, thus ensuring the reliability of the welded connection between the first conduit 10 and the second conduit 20. Simultaneously, it ensures the weld strength between the first conduit 10 and the first connecting pipe 300, effectively preventing separation of the first conduit 10 and the first connecting pipe 300. Furthermore, it ensures the weld strength between the first branch conduit 21 and the second branch conduit 22, effectively preventing separation of the first branch conduit 21 and the second branch conduit 22.

[0085] Optionally, when the materials of the first pipe 10 and the second pipe 20 are different, the solder required for welding the first pipe 10 and the second pipe will also be different. For example, when the second pipe 20 is a copper pipe or a copper alloy pipe, a first solder is used when welding the first pipe 10 and the second pipe 20. The composition and mass percentage of the first solder are: Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder being Zn; melting temperature range 880℃-890℃, recommended brazing temperature 920℃-930℃. The composition and percentage of the flux are: boric acid: 60%-80%, fluoride: 5%-15%, potassium borate: 10%-20%.

[0086] For example, when the second pipe 20 is a stainless steel pipe, a second solder is used when welding the first pipe 10 to the second pipe 20. The composition and mass percentage of the second solder are as follows: Cu: 46%-50%, Ni: 9%-11%, Si: 0.04%-0.25%, with the remainder being Zn and unavoidable impurities; melting temperature range 910℃-935℃, recommended brazing temperature 950℃-975℃. The composition and mass percentage of the flux are as follows: boric acid: 60%-80%, fluoride: 5%-15%, potassium borate: 10%-20%.

[0087] According to the second aspect embodiment of the present utility model, a shut-off valve assembly 1000 is provided, referring to... Figure 1 and Figure 2 It includes: a shut-off valve 200, a first connecting pipe 300, and a plug assembly 100 of the first aspect of this embodiment. The shut-off valve 200 has a first interface; one end of the first connecting pipe 300 (e.g., Figure 1 The upper end of the first connecting pipe 300 (as shown) is connected to the first interface of the shut-off valve 200; the other end of the first piping 10 is connected to the other end of the first connecting pipe 300 (as shown). Figure 1 The lower end of the first connector 300 shown is connected.

[0088] For example, such as Figure 1 and Figure 2As shown, the lower end of the shut-off valve 200 is provided with a first interface, the first connecting pipe 300 is vertically arranged in the up-down direction, the upper end of the first connecting pipe 300 is connected to the first interface, and the lower end of the first connecting pipe 300 is connected to the first pipe 10 of the plug assembly 100.

[0089] According to the embodiments of the present invention, the shut-off valve assembly 1000, by setting the plug assembly 100 of the first aspect embodiment above and using a first solder with a lower melting point than the second solder, can prevent the weld between the second pipe 20 and the first pipe 10 from being affected when the first pipe 10 and the first connecting pipe 300 are welded, thereby ensuring the reliability of the connection between the first pipe and the second pipe 20. At the same time, it can reduce the material used in the first pipe 10, thereby reducing the production cost of the plug assembly 100.

[0090] According to a second aspect embodiment of the present invention, the heating and ventilation device is described below. Figure 1 This includes the shut-off valve assembly 1000 of the second aspect of this embodiment.

[0091] According to the embodiments of the present invention, the shut-off valve assembly 1000, by providing the shut-off valve 200 assembly of the second aspect embodiment described above, and by providing a plug assembly 100 on the shut-off valve 200 assembly, and by making one of the first pipe 10 and the second pipe 20 a flexible stainless steel component on the plug assembly 100, can reduce the installation difficulty between the first pipe 10 and the second pipe 20, thereby reducing the assembly time of the HVAC system and lowering production costs; at the same time, it can also reduce the risk of cracking at the connection between the first pipe 10 and the second pipe 20 due to vibration, thereby improving the reliability of the HVAC system.

[0092] The following is for reference. Figures 1-9 This invention describes a heating, ventilation, and air conditioning (HVAC) device according to five embodiments of the present invention.

[0093] Example 1,

[0094] The heating and ventilation device according to the embodiments of this utility model, such as Figure 1 As shown, the HVAC system includes a shut-off valve assembly 1000, which includes a plug assembly 100, a shut-off valve 200, and a first connecting pipe 300. The shut-off valve 200 is provided with a first interface, the upper end of the first connecting pipe 300 is connected to the first interface, and the lower end of the first connecting pipe 300 is connected to the plug assembly 100.

[0095] The plug assembly 100 includes a first conduit 10 and a second conduit 20. The first conduit 10 is located above the second conduit 20. The upper end of the first conduit 10 is connected to a first connecting pipe 300, and the lower end of the first conduit 10 is connected to the upper end of the second conduit 20. The lower end of the second conduit 20 is closed. Specifically, the first conduit 10 includes a main pipe section 11 and a connecting pipe section 12. The upper end of the main pipe section 11 is connected to the first connecting pipe 300, and the lower end of the main pipe section 11 forms a connecting hole. The upper end of the connecting pipe section 12 is connected to the periphery of the connecting hole, and the lower end of the connecting pipe section 12 is connected to the second conduit 20.

[0096] like Figure 3 As shown, the first pipe 10 is a single piece made of flexible stainless steel, and the second pipe 20 is a single piece made of copper or flexible stainless steel.

[0097] When connecting the plug assembly 100 to the first connecting pipe 300, the first pipe 10 and the second pipe 20 are first connected by soldering with tin bronze solder, and the assembly of the plug assembly 100 is completed. Then, the first pipe 10 and the first connecting pipe 300 are connected by soldering with silver copper solder. At this time, the connection between the plug assembly 100 and the first connecting pipe 300 is completed.

[0098] Stainless steel is composed of the following components by weight percentage: C: less than 0.02%, Si: 0.5%–1%, Mn: 1–2%, Cr: 16–18%, Ni: 9–11%, Cu: 2–4%, Mo: 0–0.02%, P: less than 0.03%, S: less than 0.03%, with the remainder consisting of Fe and unavoidable impurities. The Md30 grade of stainless steel has a temperature range of -50℃ to -80℃. The yield strength of stainless steel is 140–180 MPa; the tensile strength decreases to 400–600 MPa; the elongation is 50–80%; the yield strength ratio is less than 0.4; and the hardness is 100–120 Hv. The wall thickness of stainless steel pipes is 1.2 mm–1.5 mm.

[0099] Additionally, when both the first conduit 10 and the second conduit 20 are made of flexible stainless steel, they are welded together using a first solder, such as... Figure 8 and Figure 9As shown, X represents the first pipe 10, Y represents the second pipe 20, and Z represents the first solder. The first solder contains, by weight (wt%), Cu: 46%–50%, Ni: 9%–11%, Si: 0.04%–0.25%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the first solder contains, by weight (wt%), 60%–80% boric acid, 5%–15% fluoride, and 10%–20% potassium borate. The melting temperature t1 when using the first solder satisfies: 910℃ ≤ t1 ≤ 935℃. The brazing temperature t2 when using the first solder satisfies: 950℃ ≤ t2 ≤ 975℃.

[0100] When the first conduit 10 is made of flexible stainless steel and the second conduit 20 is made of copper, the first conduit 10 and the second conduit 20 are welded together using a second solder. Figure 8 and Figure 9 As shown, X represents the first pipe 10, Y represents the second pipe 20, and Z represents the second solder. The second solder contains, by weight (wt%), Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the second solder contains, by weight (wt%), 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder satisfies: 920℃≤t2≤930℃.

[0101] In this embodiment, the plug assembly 100 reduces the installation difficulty between the first pipe 10 and the second pipe 20 by setting one of the first pipe 10 and the second pipe 20 as a flexible stainless steel component, thereby reducing the assembly time of the HVAC system and lowering production costs. At the same time, it also reduces the risk of vibration cracking at the connection between the first pipe 10 and the second pipe 20, thereby improving the reliability of the HVAC system.

[0102] Example 2,

[0103] like Figure 5 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the main pipe 11 in Embodiment 1 is an integral part, while the main pipe 11 of the first pipe 10 in this embodiment is a separate part.

[0104] The main pipe section 11 includes a first straight pipe section 111 and a first tapered pipe section 112 connected in sequence. The first straight pipe section 111 is a circular pipe with a uniform cross-section. The upper end of the first straight pipe section 111 is connected to the first connecting pipe 300. The cross-sectional dimensions of the first tapered pipe section 112 gradually decrease from top to bottom. The lower end of the first tapered pipe section 112 is connected to the connecting pipe section 12. The first straight pipe section 111 and the first tapered pipe section 112 are made of flexible stainless steel.

[0105] Compared with the plug assembly 100 in Embodiment 1, the plug assembly 100 of this embodiment has an inclined flow channel formed in the main pipe section 11, which facilitates the flow of refrigerant in the main pipe and effectively prevents refrigerant from remaining in the main pipe section 11.

[0106] Example 3,

[0107] like Figure 6 As shown, the structure of this embodiment is roughly the same as that of embodiment two, with the same components using the same reference numerals. The only difference is that the main pipe section 11 in embodiment two includes a first straight pipe section 111 and a first tapered pipe section 112, while the main pipe section 11 in this embodiment includes a first straight pipe section 111, a first tapered pipe section 112, a second straight pipe section 113, and a second tapered pipe section 114.

[0108] The first straight pipe section 111, the first tapered pipe section 112, the second straight pipe section 113, and the second tapered pipe section 114 are sequentially and sealed together. The upper end of the second straight pipe section 113 is connected to the lower end of the first tapered pipe section 112, and the lower end of the second straight pipe section 113 is connected to the second tapered pipe section 114. The lower end of the second tapered pipe section 114 is connected to a connecting hole. The cross-sectional dimensions of the second tapered pipe section 114 gradually decrease from top to bottom. The first straight pipe section 111, the first tapered pipe section 112, the second straight pipe section 113, and the second tapered pipe section 114 are made of flexible stainless steel.

[0109] Compared with the plug assembly 100 in Embodiment 2, the plug assembly 100 of this embodiment has a more inclined flow channel formed in the main pipe section 11, which can further effectively prevent refrigerant from remaining in the main pipe section 11.

[0110] Example 4,

[0111] like Figure 7 As shown, the structure of this embodiment is roughly the same as that of embodiment three, with the same components using the same reference numerals. The only difference is that the main pipe section 11 of the first pipe 10 in embodiment three includes a first straight pipe section 111, a first tapered pipe section 112, a second straight pipe section 113, and a second tapered pipe section 114. In this embodiment, the first pipe 10 includes a first pipe 101 and an end cap 102.

[0112] The first tube 101 is a straight tube, and its upper end is used to connect to the first connecting pipe 300. The end cap 102 is installed on the lower end of the first tube 101, and the connecting pipe portion 12 is formed on the end cap 102. The first tube 101 is made of copper, and the end cap 102 is made of flexible stainless steel.

[0113] Compared with the plug assembly 100 in Embodiment 3, the plug assembly 100 in this embodiment has an end cap 102 covering the lower end of the first tube 101, which can effectively prevent the liquid flowing out of the shut-off valve 200 from leaking from the connection between the end cap 102 and the first tube 101, thereby ensuring the sealing effect between the end cap 102 and the first tube 101.

[0114] Example 5,

[0115] like Figure 4 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same components using the same reference numerals. The only difference is that the second pipe 20 in Embodiment 1 is an integral part, while the second pipe 20 in this embodiment is a separate part.

[0116] The second conduit 20 includes a first branch pipe 21 and a second branch pipe 22. The upper end of the first branch pipe 21 is connected to the first conduit 10, and the upper end of the second branch pipe 22 is connected to the lower end of the first conduit 10. The lower end of the second branch pipe 22 is closed. The first branch pipe 21 is made of flexible stainless steel, and the second branch pipe 22 is made of copper.

[0117] The first branch pipe 21 and the second branch pipe 22 are welded together using a second solder, such as Figure 8 and Figure 9 As shown, X represents the first branch pipe 21, Y represents the second branch pipe 22, and Z represents the second solder. The second solder contains, by weight (wt%), Cu: 57%-61%, Sn: 1.0%-1.5%, Si: 0.05%-0.2%, with the remainder consisting of Zn and unavoidable impurities. The flux used when using the second solder contains, by weight (wt%), 60%-80% boric acid, 5%-15% fluoride, and 10%-20% potassium borate. The melting temperature t1 when using the second solder satisfies: 880℃≤t1≤890℃. The brazing temperature t2 when using the second solder satisfies: 920℃≤t2≤930℃.

[0118] Compared with the plug assembly 100 in Embodiment 1, the plug assembly 100 of this embodiment can reduce the amount of copper used in the second piping 20, thereby further reducing the production cost of the plug assembly 100.

[0119] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0120] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0121] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0123] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A plug assembly (100) for sealing one end of a first connecting pipe (300), characterized in that, include: A first conduit (10) is adapted to be connected to the first connecting pipe (300); The second pipe (20) has one end closed and the other end connected to the end of the first pipe (10) away from the first connecting pipe (300); At least one of the first pipe (10) and the second pipe (20) is made of flexible stainless steel.

2. The plug assembly (100) according to claim 1, characterized in that, The first conduit (10) includes a main pipe (11) and a connecting pipe (12). One end of the main pipe (11) is adapted to be connected to the first connecting pipe (300). The other end of the main pipe (11) has a connecting hole. One end of the connecting pipe (12) is connected to the periphery of the connecting hole. The other end of the connecting pipe (12) is connected to the second conduit (20).

3. The plug assembly (100) according to claim 2, characterized in that, In the direction from the main pipe (11) to the connecting pipe (12), the cross-sectional dimensions of the main pipe (11) are the same, or the cross-sectional dimensions of at least a portion of the main pipe (11) gradually decrease.

4. The plug assembly (100) according to claim 3, characterized in that, The main pipe section (11) includes a first straight pipe section (111) and a first tapered pipe section (112) connected in sequence. The first straight pipe section (111) is a circular pipe with a uniform cross-section. The first straight pipe section (111) is adapted to be connected to the first connecting pipe (300). In the direction from the first straight pipe section (111) to the first tapered pipe section (112), the cross-sectional size of the first tapered pipe section (112) gradually decreases. The first tapered pipe section (112) is connected to the connecting pipe section (12).

5. The plug assembly (100) according to claim 2, characterized in that, The first pipe (10) is an integral piece, wherein the first pipe (10) is a flexible stainless steel material piece, and / or the first pipe (10) is a copper piece.

6. The plug assembly (100) according to claim 2, characterized in that, The first piping (10) includes: a first pipe (101) and an end cap (102). The first pipe (101) is a straight pipe. One end of the first pipe (101) is used to connect to a first connecting pipe (300). The end cap (102) is placed on the other end of the first pipe (101). The connecting pipe portion (12) is formed on the end cap (102).

7. The plug assembly (100) according to claim 6, characterized in that, The first tube (101) is made of flexible stainless steel, and / or the end cap (102) is made of copper.

8. The plug assembly (100) according to any one of claims 1-7, characterized in that, The second pipe (20) is an integral piece, and the second pipe (20) is a flexible stainless steel material or a copper material.

9. The plug assembly (100) according to any one of claims 1-7, characterized in that, The second pipe (20) includes: a first branch pipe (21) and a second branch pipe (22), the first branch pipe (21) is connected to the first pipe (10), the second branch pipe (22) is connected to the end of the first branch pipe (21) away from the first pipe (10), and the end of the second branch pipe (22) away from the first branch pipe (21) is closed.

10. The plug assembly (100) according to claim 9, characterized in that, The first branch pipe (21) is made of flexible stainless steel, and / or the second branch pipe (22) is made of copper.

11. The plug assembly (100) according to claim 10, characterized in that, The yield strength of the flexible stainless steel is 140-180 MPa; and / or, the tensile strength of the flexible stainless steel is reduced to 400-600 MPa; and / or, the elongation of the flexible stainless steel is 50-80%; and / or, the yield strength ratio of the flexible stainless steel is less than 0.4; and / or, the hardness of the flexible stainless steel material is 100-120 Hv.

12. The plug assembly (100) according to claim 10, characterized in that, The Md30 of the flexible stainless steel is -50℃ to -80℃.

13. The plug assembly (100) according to claim 10, characterized in that, The flexible stainless steel is austenitic stainless steel, and the average grain size of the flexible stainless steel is 20μm to 40μm.

14. The plug assembly (100) according to claim 10, characterized in that, The wall thickness of the flexible stainless steel pipe is 1.2mm to 1.5mm.

15. The plug assembly (100) according to claim 1, characterized in that, The second conduit (20) is plugged into the second conduit (20), and the insertion depth of the second conduit (20) is 5mm-20mm.

16. The plug assembly (100) according to claim 1, characterized in that, The first pipe (10) is plugged into the second pipe (20), and the fitting gap between the second pipe (20) and the first pipe (10) is 0.1mm-0.2mm.

17. A shut-off valve assembly (1000), characterized in that, include: A shut-off valve (200) having a first port; A first connecting pipe (300) is connected at one end to the first interface of the shut-off valve (200); The plug assembly (100) according to any one of claims 1-16 is connected to the other end of the first conduit (10) and the first connecting pipe (300).

18. A heating, ventilation, and air conditioning (HVAC) device, characterized in that, Includes the shut-off valve assembly (1000) according to claim 17.

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