Stop valve assembly
By using steel connecting pipes and steel pipe components for fusion welding in the refrigeration system, combined with copper solder filling and optimized welding design, the problem of easy cracking in steel pipe welding was solved, the welding strength and reliability were improved, and the production cost was reduced.
Patent Information
- Application Number
- CN202422637447.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-10-31
AI Technical Summary
When steel pipes are used instead of copper pipes in a refrigeration system, cracks and weaknesses are more likely to appear at the welded joints, resulting in lower connection strength and affecting the reliability of the refrigeration components.
The steel pipe fittings and steel pipe joints are connected by fusion welding, combined with brazing or argon welding, and filled with copper solder to improve the welding strength. The welding quality is ensured by adjusting the design of the connection surface and weld seam.
It improves the connection strength and reliability of the welded parts, reduces the production cost of the refrigeration components, and maintains the smoothness and aesthetics of fluid flow.
Smart Images
Figure CN223483549U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of refrigeration technology, and specifically relates to a shut-off valve assembly. Background Technology
[0002] In related technologies, copper pipes are mostly used in the piping of refrigeration systems. Copper pipes are expensive. In order to reduce the cost pressure on air conditioner manufacturers, steel pipes are used instead of copper pipes. However, when stainless steel materials are flame-brazed, cracks and weaknesses are easily generated, resulting in low connection strength at the welded parts. How to improve the connection strength of the connection parts of refrigeration components is an urgent problem to be solved. Utility Model Content
[0003] Therefore, it is necessary to address the above problems by providing a shut-off valve assembly with high connection strength at the connection point. The specific solution is as follows:
[0004] The shut-off valve assembly includes a shut-off valve and a steel pipe fitting. The shut-off valve includes a valve body and a steel pipe fitting. One end of the steel pipe fitting is welded to the valve body, and the other end of the steel pipe fitting is welded to the steel pipe fitting.
[0005] The gate valve assembly provided in this application is prone to cracks and weaknesses when the stainless steel material is welded, resulting in low connection strength at the welded parts. By using fusion welding to connect the steel pipe and the steel pipe fitting, the welding strength at the welded parts can be improved, thereby improving the reliability of the gate valve assembly. Attached Figure Description
[0006] Figure 1 Exploded view of the shut-off valve assembly;
[0007] Figure 2 This is a sectional view of a shut-off valve.
[0008] Figure 3 This is a three-dimensional schematic diagram of the shut-off valve assembly;
[0009] Figure 4 This is a schematic diagram of the projected structure of the shut-off valve assembly.
[0010] Figure 5 for Figure 4 A magnified view of a portion of the image;
[0011] Figure 6 This is a cross-sectional view of the shut-off valve assembly;
[0012] Figure 7 for Figure 6 A magnified view of a portion of the image;
[0013] 100. Gate valve assembly; 10. Gate valve; 1. Valve body; 11. Connecting part; 2. Steel connecting pipe; 3. Steel pipe fitting; 21. First end; 22. Second end; 220. Connecting surface; 31. Third end; 32. Fourth end; 310. Connecting mating surface; 4. Welded part; 5. Copper adapter; 12. Sealing ring; 14. Valve stem head; 13. Valve stem; Detailed Implementation
[0014] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0015] In related technologies, copper pipes are mostly used for piping components in refrigeration systems, but copper pipes are relatively expensive. To alleviate cost pressures on air conditioner manufacturers, steel pipes are used instead of copper pipes. However, steel materials are prone to cracks and weaknesses during welding, resulting in lower weld strength at the welded joints. Therefore, improving the connection strength of the connection joints of refrigeration system components is an urgent problem that needs to be solved.
[0016] See appendix Figure 1-7 To address the aforementioned technical problems, this application provides a gate valve assembly 100, which includes a gate valve 10 and a steel pipe fitting 3. The gate valve 10 includes a valve body 1 and a steel connecting pipe 2. One end of the steel connecting pipe 2 is welded to the valve body 1, and the other end of the steel connecting pipe 2 is fusion-welded to the steel pipe fitting 3. The gate valve is equipped with a steel connecting pipe 2, which facilitates welding to the steel pipe fitting 3. Stainless steel is prone to cracking and weaknesses during welding, resulting in low connection strength at the welded joint. Welding the steel connecting pipe and the steel pipe fitting together improves the weld strength at the welded joint, thereby enhancing the reliability of the gate valve assembly.
[0017] Furthermore, both the valve body 1 and the steel connecting pipe 2 of the gate valve 10 are made of steel, preferably stainless steel. Compared with existing copper gate valves, stainless steel gate valves have the following advantages:
[0018] 1. Stainless steel has high strength, so the required wall thickness can be thin, resulting in less material used in the overall product and lighter weight;
[0019] 2. Stainless steel materials are relatively inexpensive;
[0020] 3. Stainless steel has better corrosion resistance than copper;
[0021] 4. Stainless steel has relatively poor thermal conductivity, resulting in relatively less heat loss;
[0022] 5. Longer product lifespan: Stainless steel has higher yield strength and tensile strength than copper; at the same time, its coefficient of thermal expansion is relatively lower than that of copper, making it less susceptible to damage from thermal expansion and contraction.
[0023] The following explains the manufacturing process of the gate valve assembly 100, explaining why the gate valve 10's steel connecting pipe 2 facilitates connection with the steel pipe fitting 3: The valve body 1 includes a connecting part 11. Normally, the steel pipe fitting 3 and the connecting part 11 can be directly welded together. However, since the valve body 1 includes a sealing ring 12, which is typically made of rubber and is prone to heat deformation, if the sealing ring 12 is installed first, and then the connecting part 11 and the steel pipe fitting 3 are connected, regardless of the welding method used, the welding temperature will be transferred into the valve body. This would cause the sealing ring 12 to deform due to heat melting. If the connecting part 11 and the steel pipe component 3 are welded first, the steel pipe component 3 in the refrigeration system has a complex and diverse layout to meet the needs of the main unit customer, and its large size makes it inconvenient to weld in a tunnel furnace. Moreover, it is not easy to pre-fix it before welding. In addition, the complex and diverse layout of the steel pipe component 3 will also affect the installation space, path and installation accuracy of the components inside the valve body 1. In addition to the sealing ring 12, the valve body 1 is also equipped with components such as valve stem 13 and valve stem head 14, which need to be installed along the axial direction of the valve body 1. Therefore, in order to solve the above technical problems, the gate valve 10 is equipped with a steel pipe 2. The connecting part 11 and the steel pipe 2 can be connected by brazing or argon welding. Brazing can be carried out by tunnel furnace brazing, flame brazing and high frequency brazing, with tunnel furnace welding being preferred. Copper solder is used to fill the space between the connecting part 11 and the steel pipe 2, preferably red copper solder. Red copper solder has strong fluidity, and the welding environment of tunnel furnace welding is better, which helps to improve the welding quality and welding strength between the connecting part 11 and the steel pipe 2.
[0024] Since the steel connecting pipe 2 is relatively small, the valve body 1 can be welded to the steel connecting pipe 2 via the connecting part 11 first, and then the components inside the valve body 1 can be installed to obtain the gate valve 10. The gate valve 10 is welded to the steel pipe fitting 3 via the steel connecting pipe 2. The welding method can be flame brazing, high-frequency welding, or fusion welding. Due to the welding characteristics of stainless steel, flame brazing is prone to cracking and weaknesses. Since the steel connecting pipe 2 and the steel pipe fitting 3 are made of the same material, it is preferable that the steel connecting pipe 2 and the steel pipe fitting 3 are welded by fusion welding. Fusion welding refers to the process of bringing the weld joint to a molten state under the action of high temperature, etc. Since the workpieces being welded are closely attached, under the action of temperature field, gravity, etc., without pressure, the molten liquid of the two workpieces will mix. After the temperature drops, the molten part solidifies, and the two workpieces are firmly welded together, completing the welding method. Fusion welding can improve the welding strength of the steel connecting pipe 2 and the steel pipe fitting 3.
[0025] Specifically, the steel pipe connector 2 includes a first end 21 and a second end 22. The first end 21 is welded to the valve body 1. The end face of the second end 22 includes a connecting surface 220. The steel pipe fitting 3 includes a third end 31. The second end 22 and the third end 31 are coaxially arranged. The end face of the third end 31 includes a connecting mating surface 310. The shape of the connecting surface 220 matches the shape of the connecting mating surface 310. The connecting surface 220 and the connecting mating surface 310 are fitted together and welded to connect and communicate the steel pipe connector 2 and the steel pipe fitting 3. Due to the influence of processing errors and processing accuracy, the connecting surface 220 and the connecting mating surface 310 will not be completely fitted together. There may be a gap L between part of the connecting surface 220 and the connecting mating surface, which needs to meet the requirement of 0≤L≤0.2mm. If the gap is too large, the gap cannot be filled by the self-fluxing material of the pipe fitting during welding, which will affect the welding strength. The steel pipe 2 and the steel pipe fitting 3 are fused and welded, that is, the connecting surface 220 and the connecting mating surface 310 can melt at the same temperature, and the steel pipe 2 and the steel pipe fitting 3 have the same properties, which facilitates the mutual fusion of the connecting surface 11 and the connecting mating surface 21 to form an integral structure, which is beneficial to improving the welding effect. Moreover, the butt weld with the surfaces touching has a sufficient welding area, which is beneficial to ensuring the connection strength between the steel pipe 2 and the steel pipe fitting 3.
[0026] The outer diameter D of the second end 22 is equal to the outer diameter D1 of the third end 31, meaning the outer walls of the second end 22 and the third end 31 are flush. When the second end 22 and the third end 31 are butt-welded together, it facilitates the hot-melt filling of the base material to form a weld. This not only ensures the aesthetics of the weld but also improves its quality and strength. Furthermore, the inner diameter d of the second end 22 is equal to the inner diameter d1 of the third end 31, meaning the inner walls of the second end 22 and the third end 31 are flush. This not only facilitates the hot-melt filling of the base material to form a weld with good quality and strength but also ensures smooth fluid flow, reduces fluid resistance, and facilitates fluid circulation.
[0027] Furthermore, in order to facilitate the processing of the connecting surface 220 and the connecting mating surface 310, and to facilitate the mating of the two surfaces, the connecting surface 220 can be set to be perpendicular to the axis of the second end 22, and / or the connecting mating surface 310 can be set to be perpendicular to the axis of the third end 31. Due to the influence of processing errors and processing accuracy, the connecting surface 220 may not be completely perpendicular to the axis of the second end 22, and the connecting mating surface 310 may not be completely perpendicular to the axis of the third end 31, but they can be approximately perpendicular.
[0028] When welding steel pipe connector 2 and steel pipe fitting 3, if the wall thickness is too thick, it may not be able to penetrate completely, affecting the welding strength. Therefore, the wall thickness of the pipe fitting to be welded should be moderate. The wall thickness of the second end 22 is defined as h, satisfying: 0.4mm≤h≤3mm; and the wall thickness of the third end 31 is defined as h1, satisfying: 0.4mm≤h1≤3mm.
[0029] The second end 22 and the third end 31 are joined by fusion welding. The shut-off valve assembly 100 also includes a weld portion 4, which is formed by mixing at least a portion of the self-melting molten liquid from the second end 22 and at least a portion of the third end 31. After the temperature decreases, the molten portion solidifies, and the second end 22 and the third end 31 are firmly welded together. The material of the weld portion 4 is the same as that of the steel pipe 2; or, the material of the weld portion 4 is the same as that of the steel pipe fitting 3.
[0030] The weld portion 4 extends along the axial direction of the second end 22; or, the weld portion 4 extends along the axial direction of the third end 31. In the axial direction of the second end 22, or in the axial direction of the third end 31, the width W of the weld portion 4 satisfies: 2mm ≤ W ≤ 8mm. If the width of the weld portion 4 is too small, it may affect the welding strength of the second end 22 and the third end 31. If the width of the weld portion 4 is too large, more heat input is required, resulting in energy waste, and the welding current is too high, making it easy to burn through.
[0031] In the radial direction of the second end 22, the dimension W1 of the weld portion 4 protruding or retracting from the outer wall of the second end 22 satisfies: W1 ≤ 0.5 mm; preferably, W1 equals 0. Alternatively, in the radial direction of the third end 31, the dimension W1 of the weld portion 4 protruding or retracting from the outer wall of the third end 31 satisfies: W1 ≤ 0.5 mm; preferably, W1 equals 0. In summary, if the dimension W1 is too large, it not only affects the aesthetics of the weld portion 4 and increases energy waste, but also affects the weld quality. If the retracted dimension is too large, it may lead to burn-through.
[0032] Furthermore, in the radial direction of the second end 22, the dimension W2 of the weld portion 4 protruding or retracting from the inner wall of the second end 22 satisfies: W2 ≤ 0.5 mm; preferably, W2 equals 0. Alternatively, in the radial direction of the third end 31, the dimension W2 of the weld portion 4 protruding or retracting from the inner wall of the third end 31 satisfies: W2 ≤ 0.5 mm. Preferably, W2 equals 0. If the dimension W2 is too large, it will not only affect the weld quality and waste energy, but also affect the smoothness of the flow path, increase fluid resistance, and hinder fluid flow.
[0033] The shut-off valve assembly 100 includes a copper adapter 5, and the steel pipe assembly 3 includes a fourth end 32, which is further away from the third end 31 than the steel pipe assembly 2. The fourth end 32 is welded to the copper adapter 5. The copper adapter 5 is provided to facilitate connection with the host customer's system copper pipe assembly.
[0034] Furthermore, the refrigeration system may also need to be equipped with a filter to filter impurities within the refrigeration cycle system, protecting the lifespan of components. Additionally, a silencer can be installed to eliminate or reduce noise generated by the flow of the working fluid. Furthermore, multi-way connectors can be configured to form multi-pipe connections. Therefore, steel pipe fitting 3 can be a filter, silencer, multi-way connector, distributor, etc.
[0035] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications without departing from the concept of this application, and these modifications all fall within the protection scope of this application.
Claims
1. A shut-off valve assembly, characterized in that, The shut-off valve assembly (100) includes a shut-off valve (10) and a steel pipe fitting (3). The shut-off valve (10) includes a valve body (1) and a steel pipe fitting (2). One end of the steel pipe fitting (2) is welded to the valve body (1), and the other end of the steel pipe fitting (2) is welded to the steel pipe fitting (3) by fusion welding.
2. The shut-off valve assembly according to claim 1, characterized in that, The steel pipe (2) includes a first end (21) and a second end (22). The first end (21) is welded to the valve body (1). The end face of the second end (22) includes a connecting surface (220). The steel pipe fitting (3) includes a third end (31). The second end (22) and the third end (31) are coaxially arranged. The end face of the third end (31) includes a connecting mating surface (310). The shape of the connecting surface (220) is adapted to the shape of the connecting mating surface (310). The connecting surface (220) and the connecting mating surface (310) are fitted together and welded to connect and communicate the steel pipe (2) and the steel pipe fitting (3).
3. The shut-off valve assembly according to claim 2, characterized in that, The outer diameter D of the second end (22) is equal to the outer diameter D1 of the third end (31); and / or, the inner diameter d of the second end (22) is equal to the inner diameter d1 of the third end (31).
4. The shut-off valve assembly according to claim 3, characterized in that, The connecting surface (220) is perpendicular to the axis of the second end (22), and / or the connecting mating surface (310) is perpendicular to the axis of the third end (31).
5. The shut-off valve assembly according to claim 4, characterized in that, The wall thickness of the second end (22) is defined as h, satisfying: 0.4mm≤h≤3mm; and the wall thickness of the third end (31) is defined as h1, satisfying: 0.4mm≤h1≤3mm.
6. The shut-off valve assembly according to any one of claims 2-5, characterized in that, The second end (22) and the third end (31) are fusion welded together. The shut-off valve assembly (100) also includes a weld portion (4), which is formed by the self-fusion of at least a portion of the second end (22) and at least a portion of the third end (31). The material of the weld portion (4) is the same as that of the steel pipe (2); or, the material of the weld portion (4) is the same as that of the steel pipe fitting (3).
7. The shut-off valve assembly according to claim 6, characterized in that, The weld portion (4) extends along the axial direction of the second end (22); or, it extends along the axial direction of the third end (31); In the axial direction of the second end (22), or in the axial direction of the third end (31), the width W of the weld portion (4) satisfies: 2mm≤W≤8mm.
8. The shut-off valve assembly according to claim 7, characterized in that, In the radial direction of the second end (22), the weld portion (4) protruding or recessing from the outer wall of the second end (22) by a dimension W1 satisfies: W1≤0.5mm; or, in the radial direction of the third end (31), the weld portion (4) protruding or recessing from the outer wall of the third end (31) by a dimension W1 satisfies: W1≤0.5mm.
9. The shut-off valve assembly according to claim 8, characterized in that, In the radial direction of the second end (22), the dimension W2 of the weld portion (4) protruding or recessing from the inner wall of the second end (22) satisfies: W2≤0.5mm; or, in the radial direction of the third end (31), the dimension W2 of the weld portion (4) protruding or recessing from the inner wall of the third end (31) satisfies: W2≤0.5mm.
10. The shut-off valve assembly according to any one of claims 7-9, characterized in that: The valve body (1) is made of the same material as the steel pipe (2). The valve body (1) includes a connecting part (11), and the connecting part (11) and the steel pipe (2) are connected by brazing or argon welding.
11. The shut-off valve assembly according to claim 6, characterized in that, In the radial direction of the second end (22), the weld portion (4) protruding or recessing from the outer wall of the second end (22) by a dimension W1 that satisfies: W1≤0.5mm; and / or, in the radial direction of the third end (31), the weld portion (4) protruding or recessing from the outer wall of the third end (31) by a dimension W1 that satisfies: W1≤0.5mm.
12. The shut-off valve assembly according to claim 6, characterized in that, In the radial direction of the second end (22), the dimension W2 of the weld portion (4) protruding or recessing from the inner wall of the second end (22) satisfies: W2≤0.5mm; or, in the radial direction of the third end (31), the dimension W2 of the weld portion (4) protruding or recessing from the inner wall of the third end (31) satisfies: W2≤0.5mm.
13. The shut-off valve assembly according to claim 7, characterized in that, In the radial direction of the second end (22), the dimension W2 of the weld portion (4) protruding or retracting from the inner wall of the second end (22) satisfies: W2 ≤ 0.5 mm; or, in the radial direction of the third end (31), the dimension W2 of the weld portion (4) protruding or retracting from the inner wall of the third end (31) satisfies: W2≤0.5mm.