Connection pipe assembly and assembling method thereof, stainless steel four-way valve, and air conditioning pipeline system

Abstract

A first connecting pipe (10) having a first connecting segment (11), a second connecting pipe (20) having a second connecting segment (21) and made of a material different from that of the first connecting pipe (10), and a connecting pipe sleeve (30) including a first pipe segment (31) and a second pipe segment (32), the first pipe segment (31) and the first connecting segment (11) being nested together, and the second pipe segment (32) and the second connecting segment (21) being nested together. ), wherein a first weld bead (33) is formed between the first connection segment (11) and the first pipe segment (31), and a second weld bead (34) is formed between the second connection segment (21) and the second pipe segment (32), the first weld bead (33) is used to accommodate a first welding material, the second weld bead (34) is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material. Such a connection pipe assembly can solve the problem of high welding difficulty in the related art. The present invention further relates to a method for assembling the connection pipe assembly, a stainless steel four-way valve, and an air conditioning pipeline system.

Description

[Technical Field]

[0001] This application claims priority from the following patent applications: 1. Priority of the patent application filed with the State Intellectual Property Office of China on March 29, 2021, bearing application number 202120628057.1 and titled "Connecting pipe assembly and air conditioning pipeline system having the same." 2. Priority of the patent application filed with the State Intellectual Property Office of China on April 13, 2021, bearing application number 202110395764.5 and titled "Connecting pipe assembly, assembling method for connecting pipe assembly, and stainless steel four-way valve." 3. Priority of the patent application filed with the State Intellectual Property Office of China on April 13, 2021, bearing application number 202120751147.X and titled "Connecting pipe assembly and stainless steel four-way valve having the same."

[0002] The present application relates to the technical field of air conditioners, and particularly to a connecting pipe assembly and an assembling method thereof, a stainless steel four-way valve, and an air conditioning pipeline system. [Background technology]

[0003] Currently, the air conditioner and the valve member need to be connected by a connecting pipe: the valve member has a first connecting pipe, the air conditioner has a second connecting pipe, and the first connecting pipe and the second connecting pipe are connected to realize the connection between the air conditioner and the valve member.

[0004] In the related technology, the first connecting pipe and the second connecting pipe are made of different materials, and it is necessary to use a high-silver brazing material to weld the first connecting pipe and the second connecting pipe together, which makes welding very difficult. Summary of the Invention

[0005] The present application provides a connecting pipe assembly and an assembling method thereof, a stainless steel four-way valve, and an air conditioning pipeline system, which solve the problem of high welding difficulty in the related art.

[0006] According to one aspect of the present application, there is provided a connection pipe assembly including: a first connection pipe having a first connection segment; a second connection pipe having a second connection segment, the second connection pipe being made of a different material than the first connection pipe; and a connection pipe sleeve including a first pipe segment and a second pipe segment, the first pipe segment and the first connection segment being nested within each other and the second pipe segment and the second connection segment being nested within each other, wherein a first weld bead is formed between the first connection segment and the first pipe segment and a second weld bead is formed between the second connection segment and the second pipe segment, the first weld bead is used to contain a first weld material and the second weld bead is used to contain a second weld material, and the melting point of the first weld material is higher than the melting point of the second weld material.

[0007] According to the technical aspects of the present application, the connection pipe assembly includes a first connection pipe, a second connection pipe, and a connection pipe sleeve. The first pipe segment and the first connection segment are nested together, and the second pipe segment and the second connection segment are nested together. A first weld bead between the first connection segment and the first pipe segment accommodates a first welding material, which connects the first connection pipe to the connection pipe sleeve. A second weld bead between the second connection segment and the second pipe segment accommodates a second welding material, which connects the second connection pipe to the connection pipe sleeve, and finally connects the first connection pipe to the second connection pipe. Furthermore, because the melting point of the first welding material is higher than that of the second welding material, the first welding material is not melted when the second connection pipe is welded to the connection pipe sleeve, ensuring a strong connection between the first connection pipe and the connection pipe sleeve.

[0008] Furthermore, the material of the connecting pipe sleeve and the material of the second connecting pipe are the same, so welding the connecting pipe sleeve and the second connecting pipe is relatively simple and easy to perform.

[0009] Furthermore, the first connecting pipe is made of stainless steel, and the second connecting pipe and connecting pipe sleeve are both made of copper. By using the connecting pipe sleeve for transition, the first connecting pipe and the second connecting pipe can be easily connected.

[0010] Furthermore, the first pipe segment is fitted to the outside of the first connection segment or the first pipe segment is inserted into the inside of the first connection segment, and the second pipe segment is fitted to the outside of the second connection segment, thereby realizing a connection between the first connection pipe and the second connection pipe.

[0011] Furthermore, the inner diameter of the first connecting pipe is equal to or greater than the inner diameter of the second connecting pipe, so that when the refrigerant flows through the first connecting pipe and the second connecting pipe, the flow resistance of the refrigerant is relatively small.

[0012] Furthermore, the overlap length between the first connection segment and the first pipe segment is 3 mm or more, ensuring that the first connection segment and the first pipe segment have a sufficiently long overlap length to ensure the connection strength between them.

[0013] Furthermore, the end of the first connecting segment and the end of the second connecting segment abut against each other. When the refrigerant flows through the first connecting pipe and the second connecting pipe, the flow state of the refrigerant is stable.

[0014] Furthermore, the length of the first connecting pipe is shorter than the length of the second connecting pipe, which makes it easier to connect the first connecting pipe and the second connecting pipe.

[0015] Furthermore, the length of the first pipe segment is shorter than the length of the second pipe segment, so that when the valve body is shipped, the first connecting pipe and the connecting pipe sleeve are first welded together, and then the customer only needs to weld the second connecting pipe and the connecting pipe sleeve to complete the connection between the first connecting pipe and the second connecting pipe, which makes it easier for the customer to operate.

[0016] Furthermore, a weld material flow groove is provided in the first weld bead, and the weld material flow groove is provided in the first connecting segment and / or the first pipe segment. After the weld ring melts, it fills the weld material flow groove, thereby realizing a weld connection between the first connecting segment and the first pipe segment.

[0017] Furthermore, the first connecting segment and the first pipe segment are welded together using brazing, which has the advantages of low cost and simple operation.

[0018] Furthermore, the connecting pipe sleeve further includes a reduced diameter segment, and the reduced diameter segment is located between the first pipe segment and the second pipe segment. When the connecting pipe sleeve is fitted onto the outside of the first connecting pipe or the second connecting pipe, the reduced diameter segment can be used to provide a restriction, ensuring assembly accuracy.

[0019]

[0006] The first and second pipe segments are located at opposite ends of the connecting pipe sleeve, respectively, the first pipe segment being insertable into the first connecting segment and welded to it, and the second pipe segment being located outside the first connecting pipe and used for welding to the second connecting pipe. The connecting pipe sleeve further includes a retaining segment located between the first and second pipe segments, with opposite ends of the retaining segment connected to the first and second pipe segments, respectively, and located outside the first connecting pipe so that an adhesion area is formed between the second pipe segment and the first connecting pipe when the first pipe segment is inserted into the first connecting segment.

[0007] The installation of the retaining segment allows the welding material to overflow toward the first connecting pipe and adhere to the upper surface first, thereby preventing the welding material from flowing into the first connecting pipe and preventing the welding material from entering the directional control valve, which could cause a fatal risk and seriously affect the normal operation of the directional control valve.

[0020] Furthermore, the length of the reserved segment along the axial direction of the connecting pipe sleeve is H1, and H1 satisfies the following relationship: H1≧2 mm. By limiting the length of the reserved segment to H1≧2 mm, it is possible to prevent the welding material from flowing into the directional control valve toward the first connecting pipe during welding between the second pipe segment and other connecting pipes in the cooling system, which could pose a fatal risk, thereby improving the reliability of the welding.

[0021] Furthermore, the length of the first pipe segment along the axial direction of the connecting pipe sleeve is H2, and the length of the second pipe segment is H3, and H1, H2, and H3 satisfy the following relationship: H1+H3>H2. Normally, the welding length H2 of the first pipe segment is relatively short, and if H1+H3 is smaller than H2, the structural strength cannot be ensured when welding the second pipe segment to other connecting pipes in the cooling system, and the welding becomes inconvenient.

[0022] Furthermore, if the wall thickness of the first pipe segment is defined as T1 and the wall thickness of the second pipe segment is defined as T2, T1 and T2 satisfy the following relationship: T1≧T2. If T1≧T2 is satisfied, when other connecting pipes in the cooling system are engaged with the connecting pipe sleeve, it is possible to restrict the other connecting pipes in the cooling system, and it is also easy to install the connecting pipe sleeve and other connecting pipes in the cooling system.

[0023] Furthermore, the connecting pipe sleeve is provided with a limiting structure, which is provided between the second pipe segment and the retaining segment and is used to limit the second connecting pipe engaged with the second pipe segment, to prevent other connecting pipes in the cooling system from being inserted too deeply into the connecting pipe sleeve, thereby destroying the strength of the structure.

[0024] Furthermore, the restricting structure includes a protrusion, which is provided on the inner wall of the second pipe segment or the retention segment, and which protrudes from the inner wall of the second pipe segment or the retention segment along the radial direction of the connecting pipe sleeve.

[0025] The restriction structure further includes a restriction ring, the restriction ring being attached to the inner wall of the second pipe segment or retention segment, and a portion of the restriction ring protruding from the inner wall of the second pipe segment or retention segment.

[0026] Furthermore, the restriction structure includes an expanded diameter segment, the maximum inner diameter of which is equal to or less than the inner diameter of the second pipe segment, such that a first restriction step is formed between the expanded diameter segment and the second pipe segment, and the second connecting pipe is inserted into the second pipe segment and abuts against the first restriction step.

[0027] Further, the restriction structure includes a counterbore, the counterbore is formed in the inner wall of the second pipe segment, and the hole diameter of the counterbore is larger than the inner diameter of the retaining segment so that a second restriction step is formed between the retaining segment and the second pipe segment, and the second connecting pipe is inserted into the second pipe segment and abuts against the second restriction step.

[0028] According to another aspect of the present application, there is provided a method for assembling the connecting pipe assembly provided above, the method including: step S10: nesting a first pipe segment of the connecting pipe sleeve and a first connection segment of the first connecting pipe together to obtain a first overlap length, and filling a section of the first overlap length with a first welding material; step S20: brazing the first connection segment to the first pipe segment at a first temperature; step S30: fitting a second pipe segment of the connecting pipe sleeve over the second connection segment of the second connecting pipe to obtain a second overlap length, and filling a section of the second overlap length with a second welding material; and step S40: welding the second connection segment to the second pipe segment at a second temperature, wherein the first overlap length is shorter than the second overlap length, and the first temperature is higher than the second temperature. When the valve body is shipped, the connecting pipe sleeve and the first connecting pipe are welded together, and the customer only needs to weld the second connecting pipe and the connecting pipe sleeve. Since the connecting pipe sleeve is used for transition, welding is easy. Furthermore, since the melting point of the first welding material is higher than that of the second welding material, the first welding material does not melt when welding the second connecting pipe and the connecting pipe sleeve, ensuring a strong connection between the first connecting pipe and the connecting pipe sleeve.

[0029] According to yet another aspect of the present application, there is provided a stainless steel four-way valve including the connecting pipe assembly provided above, which includes a cylindrical main valve body and a first connecting pipe fixedly connected to the main valve body, the main valve body and the first connecting pipe being made of the same material, and the hardness of the main valve body and the first connecting pipe being greater than the hardness of the second connecting pipe. Therefore, this stainless steel four-way valve is also easy to assemble and can ensure the strength of the connection between the first connecting pipe and the connecting pipe sleeve.

[0030] According to yet another aspect of the present application, there is provided an air conditioning pipeline system including a pipeline and the connecting pipe assembly provided above, wherein one end of the connecting pipe assembly is connected to a valve and the other end is welded to the pipeline. [Brief explanation of the drawings]

[0031] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0032] [Figure 1] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 1 according to the present application. [Figure 2] 1 shows a cross-sectional view of a first connecting pipe, a second connecting pipe and a connecting pipe sleeve of the connecting pipe assembly provided in Example 1 according to the present application. [Figure 3] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 1 according to the present application. [Figure 4] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 1 according to the present application. [Figure 5] 1 shows a cross-sectional view of a first connecting pipe and a connecting pipe sleeve of the connecting pipe assembly provided in Example 1 according to the present application. [Figure 6] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 2 according to the present application. [Figure 7] 1 shows a structural schematic diagram of a directional control valve provided in Example 3 of the present application. [Figure 8] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 3 according to the present application. [Figure 9] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 3 according to the present application. [Figure 10] 1 shows a structural schematic diagram of the connecting pipe assembly provided in Example 3 according to the present application.

[0033] Here, the above-mentioned drawings include the following reference numerals: 10 first connecting pipe, 11 first connecting segment, 20 second connecting pipe, 21 second connecting segment, 30 connecting pipe sleeve, 31 first pipe segment, 32 second pipe segment, 33 first weld bead, 34 second weld bead, 35 reduced diameter segment, 36 retaining segment, 37 limiting structure, 371 protrusion, 372 expanded diameter segment, 3721 first limiting step, 373 counterbore, 3731 third limiting step, 40 main valve body, 100 connecting pipe assembly, 101 directional control valve, L1 first overlap length, L2 second overlap length, T1 first pipe segment wall thickness, T2 second pipe segment wall thickness, H1 retaining segment length, H2 first pipe segment length, H3 second pipe segment length. DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, the technical aspects of the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application. However, it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The description of at least one exemplary embodiment below is merely explanatory in nature and does not impose any restrictions on the present application and its application or use. Based on the embodiments of the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present application.

[0035] 1 to 5, Example 1 of the present application provides a connecting pipe assembly including a first connecting pipe 10, a second connecting pipe 20, and a connecting pipe sleeve 30, where the first connecting pipe 10 and the second connecting pipe 20 are made of different materials. The first connecting pipe 10 has a first connecting segment 11, the second connecting pipe 20 has a second connecting segment 21, and the connecting pipe sleeve 30 includes a first pipe segment 31 and a second pipe segment 32, where the first pipe segment 31 and the first connecting segment 11 are nested together, and the second pipe segment 32 and the second connecting segment 21 are nested together. Here, there is a first weld bead 33 between the first connection segment 11 and the first pipe segment 31, and a second weld bead 34 between the second connection segment 21 and the second pipe segment 32, the first weld bead 33 is used to accommodate a first welding material, and the second weld bead 34 is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material.

[0036] When the connecting pipe assembly provided in this embodiment is applied to connect the first connecting pipe 10 and the second connecting pipe 20, the first pipe segment 31 of the connecting pipe sleeve 30 and the first connecting segment 11 of the first connecting pipe 10 are first nested together, and a first welding material is used to connect the first connecting pipe 10 and the connecting pipe sleeve 30. Then, the second pipe segment 32 of the connecting pipe sleeve 30 and the second connecting segment 21 of the second connecting pipe 20 are nested together, and a second welding material is used to connect the second connecting pipe 20 and the connecting pipe sleeve 30. Finally, the first connecting pipe 10 and the second connecting pipe 20 are connected. When the second connecting pipe 20 and the connecting pipe sleeve 30 are welded together, the melting point of the first welding material is higher than that of the second welding material, so the first welding material is not melted, ensuring a strong connection between the first connecting pipe 10 and the connecting pipe sleeve 30.

[0037] The first welding material refers to the welding material in the first weld bead 33 after completing the welding between the first connecting pipe 10 and the connecting pipe sleeve 30. Similarly, the second welding material refers to the welding material in the second weld bead 34 after completing the welding between the second connecting pipe 20 and the connecting pipe sleeve 30.

[0038] In this embodiment, when welding the first connecting pipe 10 and the connecting pipe sleeve 30, a weld ring is placed on the end of the first connecting segment 11, and the weld ring is heated to become liquid and fill the first weld bead 33, thereby realizing welding between the first connecting pipe 10 and the connecting pipe sleeve 30.

[0039] Here, the material of the connecting pipe sleeve 30 is the same as that of the second connecting pipe 20. Welding the connecting pipe sleeve 30 and the second connecting pipe 20 together is relatively simple and easy to perform.

[0040] In this embodiment, the first connecting pipe 10 is made of stainless steel, and the second connecting pipe 20 and connecting pipe sleeve 30 are both made of copper. The use of the connecting pipe sleeve 30 facilitates the connection between the first connecting pipe 10 and the second connecting pipe 20. Specifically, the second connecting pipe 20 and connecting pipe sleeve 30 are both made of red copper. Because red copper is welded to red copper, the welding is easy and straightforward.

[0041] Specifically, the first pipe segment 31 is fitted to the outside of the first connection segment 11 or the first pipe segment 31 is inserted inside the first connection segment 11, and the second pipe segment 32 is fitted to the outside of the second connection segment 21.

[0042] In this embodiment, the connecting pipe sleeve 30 is fitted onto the outside of the first connecting pipe 10 and the second connecting pipe 20, which does not require expanding the diameter of the first connecting pipe 10 or machining the pipe member, and simplifies the manufacturing process. The transition of the inner diameter of the first connecting pipe 10 and the second connecting pipe 20 is smooth, ensuring that the refrigerant has less flow resistance when flowing through the first connecting pipe 10 and the second connecting pipe 20.

[0043] In this embodiment, the inner diameter of the first connecting pipe 10 is equal to or greater than the inner diameter of the second connecting pipe 20. When the refrigerant flows through the first connecting pipe 10 and the second connecting pipe 20, the flow resistance of the refrigerant is relatively small.

[0044] In this embodiment, the overlap length between the first connecting segment 11 and the first pipe segment 31 is 3 mm or more, ensuring a sufficiently long overlap length between the first connecting segment 11 and the first pipe segment 31 and ensuring the strength of the connection between them. If the overlap length between the first connecting segment 11 and the first pipe segment 31 is less than 3 mm, the strength of the connection between the first connecting segment 11 and the first pipe segment 31 cannot be ensured.

[0045] Specifically, the overlap length between the first connecting segment 11 and the first pipe segment 31 includes, but is not limited to, 4 mm, 5 mm, 6 mm, 7 mm, and 8 mm.

[0046] The overlap length between the first connection segment 11 and the first pipe segment 31 refers to the overlap length between the first connection segment 11 and the first pipe segment 31 in the axial direction of the connection pipe sleeve 30.

[0047] 2, the end of the first connecting segment 11 and the end of the second connecting segment 21 abut against each other. When the refrigerant flows through the first connecting pipe 10 and the second connecting pipe 20, the refrigerant flows stably.

[0048] In this embodiment, the length of the first connecting pipe 10 is shorter than the length of the second connecting pipe 20, which makes it easier to connect the first connecting pipe 10 and the second connecting pipe 20 together.

[0049] 2, the length of the first pipe segment 31 is shorter than the length of the second pipe segment 32. When the valve body is shipped, the first connecting pipe 10 and the connecting pipe sleeve 30 are first welded together, and then the customer only needs to weld the second connecting pipe 20 and the connecting pipe sleeve 30 together to complete the connection between the first connecting pipe 10 and the second connecting pipe 20, which makes the customer's operation easier.

[0050] Here, a welding material flow groove is provided in the first weld bead 33, and the welding material flow groove is provided in the outer wall of the first connection segment 11 and / or the inner wall of the first pipe segment 31. After the weld ring melts, it fills the welding material flow groove, thereby realizing a welded connection between the first connection segment 11 and the first pipe segment 31.

[0051] In this embodiment, the welding material flow grooves are provided on the outer wall of the first connection segment 11, which is easy to process. In other embodiments, the welding material flow grooves are provided on the inner wall of the first pipe segment 31, or welding material flow grooves may be provided on both the outer wall of the first connection segment 11 and the inner wall of the first pipe segment 31.

[0052] In this embodiment, the first connecting segment 11 and the first pipe segment 31 are welded together using brazing, which has the advantages of low cost and simple operation.

[0053] Here, the second connecting segment 21 and the second pipe segment 32 are welded together using the flame welding method.

[0054] In this embodiment, the first connecting pipe 10 is a connecting pipe of a four-way valve.

[0055] In this embodiment, the melting temperature of the first welding material is between 900°C and 1020°C. Specifically, the melting temperature of the first welding material is between 930°C and 1000°C, and the melting temperature of the second welding material is between 700°C and 830°C.

[0056] As shown in Fig. 6, Example 2 of the present application provides a connecting pipe assembly, and the difference between Example 2 and Example 1 is that in Example 2, the connecting pipe sleeve 30 further includes a reduced diameter segment 35, and the reduced diameter segment 35 is located between the first pipe segment 31 and the second pipe segment 32. When fitting the connecting pipe sleeve 30 onto the outside of the first connecting pipe 10 or the second connecting pipe 20, the reduced diameter segment 35 can be used to provide a restriction, ensuring assembly accuracy.

[0057] In this embodiment, the reduced diameter segment 35 is used to restrict the second connecting pipe 20. Since the second connecting pipes 20 have various sizes, when the connecting pipe sleeve 30 is fitted onto the outside of second connecting pipes 20 with different outer diameters, when the second connecting segment 21 reaches a predetermined depth, the end of the second connecting segment 21 and the reduced diameter segment 35 come into contact with each other, indicating to the user that the assembly has been completed correctly. The provision of the reduced diameter segment 35 allows the connecting pipe sleeve 30 to be adapted to second connecting pipes 20 with various sizes, improving the applicability of the connecting pipe assembly.

[0058] 7 to 10, a third embodiment of the present application provides a connecting pipe assembly 100 that is applied to an air conditioning system and is used to connect a valve of the air conditioning system to a pipeline in the air conditioning system. Here, the valve may be a directional control valve, an expansion valve, etc. Of course, the connecting pipe assembly 100 may be used as an intermediate member between two pipelines to connect two pipelines in the air conditioning system.

[0059] Specifically, the connecting pipe assembly 100 includes a first connecting pipe 10 and a connecting pipe sleeve 30, the first connecting pipe 10 includes a first connecting segment 11, the connecting pipe sleeve 30 includes a first pipe segment 31 and a second pipe segment 32, the first pipe segment 31 and the second pipe segment 32 are respectively located at both ends of the connecting pipe sleeve 30, the first pipe segment 31 can be inserted into the first connecting segment 11 and is welded to the first connecting segment 11 by an outer wall, and the second pipe segment 32 is located outside the first connecting pipe 10. and is used for welding to the second connecting pipe 20, the connecting pipe sleeve 30 further includes a retaining segment 36, the retaining segment 36 is located between the first pipe segment 31 and the second pipe segment 32, both ends of the retaining segment 36 are connected to the first pipe segment 31 and the second pipe segment 32, and the retaining segment 36 is located outside the first connecting pipe 10 so that when the first pipe segment 31 is inserted into the first connecting segment 11, an adhesion area is formed between the second pipe segment 32 and the first connecting pipe 10.

[0060] Furthermore, when welding conventional pipelines and components, there is a risk that welding material and welding slag may flow from the connecting pipes of the directional control valve, expansion valve, etc. into the interior of the products, causing the products to malfunction and even resulting in breakdowns. In the technical embodiment disclosed in the present application, by installing the retention segment 36, if excess welding material overflows toward the first connecting pipe 10 when welding the second connecting pipe 20 to the second pipe segment 32, the excess welding material can first overflow to the retention segment 36 and adhere to its upper surface, and in particular, the inner wall of the first pipe segment 31 may also be used as an adhesion area. In other words, the adhesive area is located inside the connecting pipe sleeve 30, and any part other than the second pipe segment 32 can be the adhesive area, including but not limited to the inner wall of the retaining segment 36, and the adhesive area serves to prevent the above-mentioned excess welding material from flowing into the first connecting pipe 10, thereby preventing the welding material from entering the interior of products such as directional control valves, expansion valves, etc., which could cause fatal risks and seriously affect the normal operation of products such as directional control valves, expansion valves, etc.

[0061] It should be noted that in this application, the connecting pipe assembly 100 is described using the directional control valve 101 as an example.

[0062] 7, this directional switching valve 101 includes a main valve element 40 and a connecting pipe assembly 100, and the connecting pipe assembly 100 is attached to the main valve element 40. The directional switching valve 101 further includes a slider (not shown), and has a valve chamber (not shown) within the main valve element 40. The slider is provided within the valve chamber and is slidable within the valve chamber, thereby realizing directional switching of the directional switching valve 101.

[0063] As shown in Figures 8 to 10, the first connecting pipe 10 is preferably made of stainless steel, and the connecting pipe sleeve 30 is preferably made of copper. Since the other connecting pipes in the cooling system are all made of copper, if the first connecting pipe 10 made of stainless steel is directly welded to the other connecting pipes made of copper, cracks will easily occur in the weld bead and fusion zone. However, if the connecting pipe sleeve 30, which is also a copper connecting pipe, is provided as a transition section between the stainless steel connecting pipe and the copper connecting pipe, the problem of cracks easily occurring in the weld bead and fusion zone can be solved, and the welding performance and reliability can be improved.

[0064] The first pipe segment 31 and the first connecting segment 11 are welded using a vacuum high-temperature brazing method, and the second pipe segment 32 and the second connecting pipe 20 are welded using a torch brazing method. The melting point of vacuum high-temperature brazing is usually 1200°C to 1300°C, while the melting point of torch brazing is 200°C to 450°C. Since the melting point of torch brazing is lower than that of vacuum high-temperature brazing, in this embodiment, the first pipe segment 31 and the first connecting segment 11 are first welded, and then the second pipe segment 32 and the second connecting pipe 20 are welded. Therefore, the temperature required to weld the second pipe segment 32 and the second connecting pipe 20 does not reach the melting point of the weld between the first pipe segment 31 and the first connecting segment 11. This does not affect the weld strength between the first pipe segment 31 and the first connecting segment 11, ensuring the reliability of the weld.

[0065] It should be noted that the welding between the first pipe segment 31 and the first connecting segment 11 is achieved by melting itself, but a weld bead is provided between the second pipe segment 32 and the second connecting pipe 20 to place the welding material, and the welding between the second pipe segment 32 and the second connecting pipe 20 is achieved by melting the welding material. Therefore, when welding the second pipe segment 32 and the second connecting pipe 20, the welding material may overflow toward the first connecting pipe 10, but this problem does not occur when welding the first pipe segment 31 and the first connecting segment 11. Furthermore, in terms of process, the first pipe segment 31 and the first connecting segment 11 are usually welded together, and then the first connecting pipe 10 and the connecting pipe sleeve 30 are delivered to the customer as a whole product, and the customer may weld the second pipe segment 32 and the second connecting pipe 20 themselves. This welding method also aims to make welding more convenient for customers.

[0066] Furthermore, the length of the retained segment 36 along the axial direction of the connecting pipe sleeve 30 is H1, and H1 satisfies the relation H1≧2 mm. If the length of the retained segment 36 is too short, it will not be effective in adhering the welding material. Therefore, it is necessary to limit the minimum length of the retained segment 36. This prevents the welding material from flowing into the directional control valve 101 toward the first connecting pipe 10 during welding between the second pipe segment 32 and the second connecting pipe 20, posing a fatal risk, thereby improving the reliability of the welding.

[0067] Furthermore, the length of the first pipe segment 31 along the axial direction of the connecting pipe sleeve 30 is H2, and the length of the second pipe segment 32 is H3, where H1, H2, and H3 satisfy the relationship H1+H3>H2. Generally, in the connecting pipe of a conventional directional control valve 101, the welding length H2 of the first pipe segment 31 is generally relatively short. If H1+H3 is smaller than H2, the structural strength cannot be ensured when welding the second pipe segment 32 to the second connecting pipe 20, the welding length will be too short, and the welding will be inconvenient.

[0068] Furthermore, if the wall thickness of the first pipe segment 31 is defined as T1 and the wall thickness of the second pipe segment 32 is defined as T2, T1 and T2 satisfy the following relationship: T1 ≥ T2. If the wall thickness T2 of the second pipe segment 32 is smaller than the wall thickness T1 of the first pipe segment 31, a step can be formed between the first pipe segment 31 and the second pipe segment 32 to restrict the second connecting pipe 20, and the connecting pipe sleeve 30 and the second connecting pipe 20 can be easily installed.

[0069] Furthermore, the connecting pipe sleeve 30 is provided with a limiting structure 37, which is provided between the retaining segment 36 and the second pipe segment 32 and serves to limit the second connecting pipe 20 engaged with the second pipe segment 32. The installation of the limiting structure 37 is used to prevent the second connecting pipe 20 from being inserted too deeply into the connecting pipe sleeve 30, thereby destroying the strength of the structure.

[0070] The restricting structure 37 is preferably provided at the connection point between the second pipe segment 32 and the retaining segment 36. The installation of the restricting structure 37 not only serves to restrict the second connecting pipe 20, but also serves as a presentation to the customer, to prevent the customer from welding the second connecting pipe 20 to the retaining segment 36, thereby nullifying the adhesion effect of the welding material of the retaining segment 36 and thereby affecting the normal operation of the directional control valve 101.

[0071] It should be noted that the restricting structure 37 may be provided in the retaining segment 36 or the second pipe segment 32, and regardless of whether it is provided in the retaining segment 36 or the second pipe segment 32, it is still necessary to ensure that the length H of the retaining segment 36 remaining in the direction towards the first connecting pipe 10 of the restricting structure 37 satisfies the condition H≧2 mm.

[0072] 8 , in one embodiment, the limiting structure 37 includes a protrusion 371, which is provided on the inner wall of the second pipe segment 32 or the retaining segment 36, and protrudes inward from the inner wall of the second pipe segment 32 or the retaining segment 36 along the radial direction of the connecting pipe sleeve 30. When the second connecting pipe 20 is inserted into the connecting pipe sleeve 30 and welded to the second pipe segment 32, the end face of the second connecting pipe 20 abuts against the protrusion 371, and the protrusion 371 plays a role in restricting the second connecting pipe 20 and preventing the second connecting pipe 20 from being inserted too deeply into the connecting pipe sleeve 30.

[0073] Of course, when the second connecting pipe 20 is fitted to the outer wall of the second pipe segment 32, the protrusion 371 may be provided to protrude toward the outside of the connecting pipe sleeve 30 and used to abut and restrict the second connecting pipe 20.

[0074] Alternatively, in this embodiment, the number of protrusions 371 may be one, two, three or more, and the protrusions 371 may be configured as a restricting ring, which is configured between the first pipe segment 31 and the second pipe segment 32, and which protrudes toward the inside / outside of the connecting pipe sleeve 30, can also achieve the purpose of restricting the second connecting pipe 20, and this is not intended to be excessively limited.

[0075] As shown in FIG. 9 , in another embodiment, the limiting structure 37 includes an enlarged diameter segment 372, and the maximum inner diameter of the enlarged diameter segment 372 is equal to or smaller than the inner diameter of the second pipe segment 32, so that a first limiting step 3721 is formed between the enlarged diameter segment 372 and the second pipe segment 32, and the second connecting pipe 20 is inserted into the second pipe segment 32 and abuts against the first limiting step 3721.

[0076] Similarly, the limiting structure 37 may be provided as a reduced diameter segment (not shown), and a second limiting step (not shown) is formed between the reduced diameter segment and the first pipe segment 31, and the second connecting pipe 20 is fitted onto the outside of the connecting pipe sleeve 30 and is in close contact with the outer wall of the second pipe segment 32 and abuts against the second limiting step, and the second limiting step is used to limit the second connecting pipe 20.

[0077] As shown in FIG. 10 , in yet another embodiment, the restriction structure 37 includes a counterbore 373, which is formed in the inner wall of the second pipe segment 32, and the diameter of the counterbore 373 is larger than the inner diameter of the retaining segment 36, so that a third restriction step 373 is formed between the retaining segment 36 and the second pipe segment 32, and the second connecting pipe 20 is inserted into the second pipe segment 32 and abuts against the third restriction step 3731.

[0078] The counterbore 373 is formed by cutting the inner wall of the second pipe segment 32, and a portion of the wall thickness of the second pipe segment 32 is removed. When the wall thickness of the second pipe segment 32 is smaller than that of the first pipe segment 31 and the retaining segment 36, a third limiting step 3731 is formed between the retaining segment 36 and the second pipe segment 32, and when the second connecting pipe 20 enters from inside the connecting pipe sleeve 30, it abuts against the third limiting step 3731. This realizes restriction while also eliminating the need for processing processes.

[0079] Embodiment 4 of the present application is a method for assembling the connecting pipe assembly provided above, comprising: Step S10: nesting the first pipe segment 31 of the connecting pipe sleeve 30 and the first connecting segment 11 of the first connecting pipe 10 to each other to obtain a first overlap length, and filling the first overlap length L1 with a first welding material; Step S20: brazing the first connection segment 11 and the first pipe segment 31 together at a first temperature; Step S30: fitting the second pipe segment 32 of the connecting pipe sleeve 30 onto the outside of the second connecting segment 21 of the second connecting pipe 20 to obtain a second overlap length L2, and filling the second overlap length L2 with a second welding material; Step S40: welding the second connection segment 21 and the second pipe segment 32 together at a second temperature; A method for assembling a connecting pipe assembly is provided. Here, the first overlap length L1 is smaller than the second overlap length L2, and the first temperature is higher than the second temperature.

[0080] Example 5 of the present application provides a stainless steel four-way valve including the connecting pipe assembly provided above, which includes a cylindrical main valve body 40 and a first connecting pipe 10 fixedly connected to the main valve body 40, where the main valve body 40 and the first connecting pipe 10 are made of the same material and the hardness of the main valve body 40 and the first connecting pipe 10 is greater than the hardness of the second connecting pipe 20.

[0081] In the device provided in the embodiment, the stainless steel directional control valve needs to be welded to the copper pipe (second connecting pipe 20) of the air conditioning system after delivery to the customer. However, because welding the stainless steel connecting pipe (first connecting pipe 10) to the copper pipe is difficult, a copper sleeve (connecting pipe sleeve 30) is placed over the end of the stainless steel connecting pipe before shipping so that the customer only needs to face the copper pipe and weld it. In addition, because the melting point of the first welding material is higher than that of the second welding material, the first welding material does not melt when welding the copper pipe and the copper sleeve, ensuring a strong connection between the stainless steel connecting pipe and the copper sleeve.

[0082] Example 6 of the present application provides an air conditioning pipeline system (not shown) that includes a pipeline (not shown) and a connecting pipe assembly 100, one end of the connecting pipe assembly 100 being connected to a valve and the other end being welded to the pipeline.

[0083] This air conditioning pipeline system also has the advantages of the connecting pipe assembly 100 described above.

[0084] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall within the scope of protection of the present application.

Claims

1. a first connecting pipe (10) having a first connecting segment (11); a second connecting pipe (20) having a second connecting segment (21) and made of a material different from that of the first connecting pipe (10); a connecting pipe sleeve (30) including a first pipe segment (31) and a second pipe segment (32), wherein the first pipe segment (31) and the first connecting segment (11) are nested together, and the second pipe segment (32) and the second connecting segment (21) are nested together; Including, wherein a first weld bead (33) is formed between the first connection segment (11) and the first pipe segment (31), and a second weld bead (34) is formed between the second connection segment (21) and the second pipe segment (32), the first weld bead (33) is used to accommodate a first welding material, and the second weld bead (34) is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material; A connecting pipe assembly, wherein an end of the first connecting segment (11) and an end of the second connecting segment (21) abut each other.

2. 2. The connecting pipe assembly according to claim 1, wherein the connecting pipe sleeve (30) and the second connecting pipe (20) are made of the same material.

3. 2. The connecting pipe assembly according to claim 1, wherein the first connecting pipe (10) is made of stainless steel, and the second connecting pipe (20) and the connecting pipe sleeve (30) are both made of copper.

4. 2. The connecting pipe assembly according to claim 1, wherein the first pipe segment (31) is fitted to the outside of the first connecting segment (11), and the second pipe segment (32) is fitted to the outside of the second connecting segment (21).

5. 2. The connecting pipe assembly according to claim 1, wherein the inner diameter of the first connecting pipe (10) is equal to or greater than the inner diameter of the second connecting pipe (20).

6. 2. The connecting pipe assembly according to claim 1, wherein the overlap length between the first connecting segment (11) and the first pipe segment (31) is 3 mm or more.

7. 2. The connecting pipe assembly according to claim 1, wherein the length of the first connecting pipe (10) is less than the length of the second connecting pipe (20).

8. 2. The connecting pipe assembly of claim 1, wherein the length of the first pipe segment (31) is less than the length of the second pipe segment (32).

9. 2. The connection pipe assembly according to claim 1, wherein a weld material flow groove is provided in the first weld bead (33), and the weld material flow groove is provided in the first connection segment (11) and / or the first pipe segment (31).

10. 2. The connecting pipe assembly according to claim 1, wherein the first connecting segment (11) and the first pipe segment (31) are welded together using brazing.

11. 2. The connecting pipe assembly of claim 1, wherein the connecting pipe sleeve (30) further comprises a reduced diameter segment (35), the reduced diameter segment (35) being located between the first pipe segment (31) and the second pipe segment (32).

12. a first connecting pipe (10) having a first connecting segment (11); a second connecting pipe (20) having a second connecting segment (21) and made of a material different from that of the first connecting pipe (10); a connecting pipe sleeve (30) including a first pipe segment (31) and a second pipe segment (32), wherein the first pipe segment (31) and the first connecting segment (11) are nested together, and the second pipe segment (32) and the second connecting segment (21) are nested together; Including, wherein a first weld bead (33) is formed between the first connection segment (11) and the first pipe segment (31), and a second weld bead (34) is formed between the second connection segment (21) and the second pipe segment (32), the first weld bead (33) is used to accommodate a first welding material, and the second weld bead (34) is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material; The first pipe segment (31) and the second pipe segment (32) are located at both ends of the connecting pipe sleeve (30), respectively, the first pipe segment (31) can be inserted into the first connecting segment (11) and is welded to the first connecting segment (11), the second pipe segment (32) is located outside the first connecting pipe (10) and is used to weld to the second connecting pipe (20), the connecting pipe sleeve (30) further includes a retaining segment (36), and the retaining segment a retaining segment (36) located between the first pipe segment (31) and the second pipe segment (32), both ends of the retaining segment (36) connected to the first pipe segment (31) and the second pipe segment (32), respectively, and located outside the first connecting pipe (10) so that an adhesion area is formed between the second pipe segment (32) and the first connecting pipe (10) when the first pipe segment (31) is inserted into the first connecting segment (11); The connecting pipe sleeve (30) is provided with a limiting structure (37), which is provided between the second pipe segment (32) and the retaining segment (36) to limit the second connecting pipe (20) engaged with the second pipe segment (32); A connecting pipe assembly, wherein the restricting structure (37) includes a protrusion (371), the protrusion (371) is provided on the inner wall of the second pipe segment (32) or the retaining segment (36), and the protrusion (371) protrudes from the inner wall of the second pipe segment (32) or the retaining segment (36) along the radial direction of the connecting pipe sleeve (30).

13. a first connecting pipe (10) having a first connecting segment (11); a second connecting pipe (20) having a second connecting segment (21) and made of a material different from that of the first connecting pipe (10); a connecting pipe sleeve (30) including a first pipe segment (31) and a second pipe segment (32), wherein the first pipe segment (31) and the first connecting segment (11) are nested together, and the second pipe segment (32) and the second connecting segment (21) are nested together; Including, wherein a first weld bead (33) is formed between the first connection segment (11) and the first pipe segment (31), and a second weld bead (34) is formed between the second connection segment (21) and the second pipe segment (32), the first weld bead (33) is used to accommodate a first welding material, and the second weld bead (34) is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material; The first pipe segment (31) and the second pipe segment (32) are located at both ends of the connecting pipe sleeve (30), respectively, the first pipe segment (31) can be inserted into the first connecting segment (11) and is welded to the first connecting segment (11), the second pipe segment (32) is located outside the first connecting pipe (10) and is used to weld to the second connecting pipe (20), the connecting pipe sleeve (30) further includes a retaining segment (36), and the retaining segment a retaining segment (36) located between the first pipe segment (31) and the second pipe segment (32), both ends of the retaining segment (36) connected to the first pipe segment (31) and the second pipe segment (32), respectively, and located outside the first connecting pipe (10) so that an adhesion area is formed between the second pipe segment (32) and the first connecting pipe (10) when the first pipe segment (31) is inserted into the first connecting segment (11); The connecting pipe sleeve (30) is provided with a limiting structure (37), which is provided between the second pipe segment (32) and the retaining segment (36) to limit the second connecting pipe (20) engaged with the second pipe segment (32); The restricting structure (37) includes a restricting ring, the restricting ring being attached to the inner wall of the second pipe segment (32) or the retaining segment (36), and a portion of the restricting ring protruding from the inner wall of the second pipe segment (32) or the retaining segment (36).

14. a first connecting pipe (10) having a first connecting segment (11); a second connecting pipe (20) having a second connecting segment (21) and made of a material different from that of the first connecting pipe (10); a connecting pipe sleeve (30) including a first pipe segment (31) and a second pipe segment (32), wherein the first pipe segment (31) and the first connecting segment (11) are nested together, and the second pipe segment (32) and the second connecting segment (21) are nested together; Including, wherein a first weld bead (33) is formed between the first connection segment (11) and the first pipe segment (31), and a second weld bead (34) is formed between the second connection segment (21) and the second pipe segment (32), the first weld bead (33) is used to accommodate a first welding material, and the second weld bead (34) is used to accommodate a second welding material, and the melting point of the first welding material is higher than the melting point of the second welding material; The first pipe segment (31) and the second pipe segment (32) are located at both ends of the connecting pipe sleeve (30), respectively, the first pipe segment (31) can be inserted into the first connecting segment (11) and is welded to the first connecting segment (11), the second pipe segment (32) is located outside the first connecting pipe (10) and is used to weld to the second connecting pipe (20), the connecting pipe sleeve (30) further includes a retaining segment (36), and the retaining segment a retaining segment (36) located between the first pipe segment (31) and the second pipe segment (32), both ends of the retaining segment (36) connected to the first pipe segment (31) and the second pipe segment (32), respectively, and located outside the first connecting pipe (10) so that an adhesion area is formed between the second pipe segment (32) and the first connecting pipe (10) when the first pipe segment (31) is inserted into the first connecting segment (11); The connecting pipe sleeve (30) is provided with a limiting structure (37), which is provided between the second pipe segment (32) and the retaining segment (36) to limit the second connecting pipe (20) engaged with the second pipe segment (32); the restriction structure (37) includes a counterbore (373), the counterbore (373) is formed in the inner wall of the second pipe segment (32), and the diameter of the counterbore (373) is larger than the inner diameter of the retention segment (36) so that a second restriction step (3731) is formed between the retention segment (36) and the second pipe segment (32); A connecting pipe assembly, wherein the second connecting pipe (20) is inserted into the second pipe segment (32) and abuts against the second limit step (3731).

15. The length of the retaining segment (36) along the axial direction of the connecting pipe sleeve (30) is H １ and H １ is expressed by the following relation H １ 15. A connecting pipe assembly according to any one of claims 12 to 14, which satisfies ≥ 2 mm.

16. The length of the first pipe segment (31) along the axial direction of the connecting pipe sleeve (30) is H ２ and the length of the second pipe segment (32) is H ３ and H １ , H ２ and H ３ is expressed by the following relation H １ +H ３ >H ２ The connection pipe assembly according to claim 15, wherein

17. The wall thickness of the first pipe segment (31) is T １ and the wall thickness of the second pipe segment (32) is defined as T ２ When defined as １ and T ２ is expressed by the following relation T １ ≧T ２ The connection pipe assembly according to any one of claims 12 to 14, which satisfies the above.

18. A method for assembling a connecting pipe assembly according to any one of claims 1 to 11, comprising the steps of: Step S10: nesting the first pipe segment (31) of the connecting pipe sleeve (30) and the first connecting segment (11) of the first connecting pipe (10) with each other to obtain a first overlap length, and filling the first overlap length with a first welding material; Step S20: brazing the first connection segment (11) and the first pipe segment (31) together at a first temperature; Step S30: fitting the second pipe segment (32) of the connecting pipe sleeve (30) onto the outside of the second connecting segment (21) of the second connecting pipe (20) to obtain a second overlap length, and filling the second overlap length with a second welding material; Step S40: welding the second connection segment (21) and the second pipe segment (32) together at a second temperature; Including, wherein the first overlap length is smaller than the second overlap length, and the first temperature is higher than the second temperature.

19. 12. A stainless steel four-way valve including the connecting pipe assembly according to any one of claims 1 to 11, comprising a cylindrical main valve body (40) and a first connecting pipe (10) fixedly connected to the main valve body (40), wherein the main valve body (40) and the first connecting pipe (10) are made of the same material, and the hardness of the main valve body (40) and the first connecting pipe (10) is greater than the hardness of the second connecting pipe (20).

20. 18. An air conditioning pipeline system comprising a pipeline and a connecting pipe assembly according to any one of claims 1 to 17, wherein one end of the connecting pipe assembly is connected to a valve and the other end is welded to the pipeline.

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