Needle valve connection structure

Abstract

A needle valve connection structure 100 includes a needle valve 10, a connecting sleeve 20, and a communicating pipe 30, the connecting pipe 30 having a flange hole 31 formed therein, the connecting sleeve 20 being fixed to the communicating pipe 30 by welding the hole wall 311 of the flange hole 31 to the connecting sleeve 20, and one end of the connecting sleeve 20 remote from the flange hole 31 being welded to the needle valve 10, the axial length of the connecting sleeve 20 being less than 25 mm. In this needle valve structure, the connecting sleeve is lap-spliced ​​between the needle valve and the communicating pipe, thereby shortening the axial length of the connecting sleeve and increasing its diameter, thereby increasing the connection strength between the needle valve and the communicating pipe, increasing the breaking torque of the connecting sleeve, making the needle valve less susceptible to twisting, and making the connecting sleeve less susceptible to breakage and more resistant to vibration even when the compressor is operating.

Description

Technical Field

[0001] (Related Application) This application claims the priority of a Chinese patent application with the application number 202222837892.3 and the title "Needle Valve Connection Structure", which was filed on October 26, 2, 2022, and the full text thereof is incorporated herein by reference.

[0002] This application relates to the technical field of valves, particularly to a needle valve connection structure.

Background Art

[0003] [[ID=I8]]Needle valves are often used in pipeline systems and play a role in opening and closing pipeline passages. A needle valve includes a valve seat and a valve pipe built into the valve seat. When a spindle is applied to a pipeline system, it is generally welded and connected to a communicating pipe in the pipeline system through the valve pipe. However, due to the relatively long length and relatively small diameter of the valve pipe, after welding, the hardness of the valve pipe may decrease, and the connection strength between the needle valve and the communicating pipe may decrease.

Summary of the Invention

[0004] According to various embodiments of the present application, a needle valve connection structure is provided.

[0005] This application provides a needle valve connection structure, which includes a needle valve, a connection sleeve, and a communicating pipe. A flange hole is drilled in the communicating pipe. The connection sleeve is fixed to the communicating pipe by welding the hole wall of the flange hole and the connection sleeve. One end of the connection sleeve away from the flange hole is welded and fixed to the needle valve.

[0006] Here, the axial length of the connection sleeve is less than 25 mm. )]]

[0007] In one embodiment, the needle valve is a brass needle valve, the connecting sleeve is a pure copper sleeve, the connecting pipe is a stainless steel pipe, and the axial length of the connecting sleeve is less than 10 mm.

[0008] In one embodiment, the needle valve has a valve seat, and along the axial direction of the connecting sleeve, a portion of the valve seat is located inside the connecting sleeve, and the portion of the valve seat located inside the connecting sleeve forms a tubular portion, which is welded and fixed to the connecting sleeve.

[0009] In one embodiment, a plane perpendicular to the axis of the connecting pipe is defined and provided along the axial direction of the connecting pipe such that the projection of the pipe portion onto the plane and the projection of the flange hole wall onto the plane coincide.

[0010] In one embodiment, the end face of the tubular portion is provided so as to be flush with the lower end face of the connecting sleeve, along the axial direction of the connecting sleeve.

[0011] In one embodiment, a plane perpendicular to the axis of the connecting pipe is defined, and a predetermined gap is formed along the axial direction of the connecting pipe between the projection of the pipe edge of the pipe section onto the plane and the projection of the hole edge of the flange hole onto the plane, with the distance of the predetermined gap being 3 mm or less.

[0012] In one embodiment, the valve seat is located above the pipe section and has a stepped surface that, by contacting the connecting sleeve, restricts the valve seat to the connecting sleeve along the axial direction.

[0013] In one embodiment, a first welding point is formed between the connecting sleeve and the valve seat, and the axial length of the first welding point is greater than 4 mm.

[0014] In one embodiment, a second welding point is formed between the connecting sleeve and the hole wall of the flange hole, and the axial length of the second welding point is greater than 2 mm.

[0015] In one embodiment, the melting point of the welding material at the first welding location is lower than the melting point of the welding material at the second welding location.

[0016] Details of one or more embodiments of this application are described in the accompanying drawings and the following description. Other features, purposes and advantages of this application will become apparent from the specification, drawings and claims. [Brief explanation of the drawing]

[0017] To more clearly describe the technical aspects of the embodiments or related technologies of this application, the drawings necessary for use in describing the embodiments or related technologies are briefly introduced below. However, the drawings in the following description represent only some embodiments of this application, and it is clear that those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] [Figure 1] This is a schematic diagram of the needle valve connection structure provided in this application. [Figure 2] This is a schematic diagram of another embodiment of the needle valve connection structure provided in this application.

[0019] 100 Needle valve connection structure, 10 Needle valve, 11 Valve seat, 111 Pipe section, 1111 End face, 12 Stepped surface, 20 Connecting sleeve, 21 First welding point, 22 Second welding point, 23 Lower end face, 30 Connecting pipe, 31 Flange hole, 311 Hole wall, 101 Plane, 102 Axis, 103 Predetermined gap. [Modes for carrying out the invention]

[0020] To make the above-mentioned objectives, features, and advantages of this application clearer and easier to understand, specific embodiments of this application will be described in detail below with reference to the drawings. In the following description, various specific details will be explained in order to make this application easier to understand. However, this application can be carried out in many other forms different from those described herein, and those skilled in the art can make similar improvements as long as they do not contradict the content of this application, and are therefore not limited by the specific embodiments disclosed below.

[0021] It should be noted that when an assembly is described as being "fixed" or "attached" to another assembly, it may be directly fixed to the other assembly, or there may be an intervening assembly. When an assembly is described as being "connected" to another assembly, it may be directly connected to the other assembly, or there may be an intervening assembly simultaneously. The terms “vertical,” “horizontal,” “up,” “down,” “left,” and “right” and similar expressions used in this specification are for illustrative purposes only and do not indicate that they represent only one embodiment.

[0022] Furthermore, the terms “first” and “second” are for descriptive purposes only and should not be understood as indicating or implying relative importance, or implicitly specifying the number of technical features described. Thus, features limited by “first” and “second” may either explicitly or implicitly include at least one of those features. In the description of this application, “multiple” means at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0023] In this application, unless otherwise explicitly stated or limited, the presence of a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or that they are indirectly in contact through an intermediate medium. Furthermore, the presence of a first feature "above," "above," and "upper side" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is greater than that of the second feature. The presence of a first feature "below," "below," and "below side" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than that of the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in the specification of this application shall have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more of the related listed items.

[0025] Referring to FIG. 1, this application includes a needle valve 10, a connection sleeve 20, and a communication pipe 30. A flange hole 31 is formed in the communication pipe 30. By welding the hole wall 311 of the flange hole 31 and the connection sleeve 20, the connection sleeve 20 is fixed to the communication pipe 30. One end of the connection sleeve 20 away from the flange hole 31 is welded and fixed to the needle valve 10. Here, the axial length of the connection sleeve 20 is less than 25 mm, providing a needle valve connection structure 100. Designed in this way, the axial length of the connection sleeve 20 is relatively short, the breaking torque is large, and furthermore, the connection strength between the needle valve 10 and the communication pipe 30 can be enhanced.

[0026] In one embodiment, the needle valve 10 is a brass needle valve, the connection sleeve 20 is a pure copper sleeve, and the communication pipe 30 is a stainless steel pipe. Since the melting point of brass is <900°C and the welding temperature of a normal stainless steel pipe is 1000°C or higher, using a pure copper sleeve with a relatively high melting point as the connection sleeve 20 can reduce the material cost of the pipeline system. At the same time, it can correspond to the welding temperature of the communication pipe 30, and the brass needle valve can be welded to the stainless steel pipe through the pure copper sleeve. Of course, in other embodiments, the needle valve 10 may be made of other materials such as pure copper or copper alloy, the connection sleeve 20 may be made of other materials such as stainless steel that can weld the needle valve 10 and the communication pipe 30 simultaneously, and the communication pipe 30 may be made of other materials such as pure copper, which can be selected according to the actual situation.

[0027] In one embodiment, the axial length of the connection sleeve 20 is less than 10 mm. The connection sleeve 20 has a substantially cylindrical shape such that after installation, the connection sleeve 20 is stacked and joined to the needle valve 10 and the communication pipe 30. Thereby, the distance between the needle valve 10 and the communication pipe 30 becomes shorter, the breaking torque of the connection sleeve 20 becomes larger, it becomes easier to meet the strength requirements during use, it is difficult to break, that is, the connection stability between the needle valve 10 and the communication pipe 30 becomes better. Specifically, the axial length of the connection sleeve 20 can take values such as 7 mm, 8 mm, 9 mm, etc. Of course, the connection sleeve 20 may be in other shapes that can be connected to the needle valve 10 and the communication pipe 30, such as a rectangular cylindrical shape, according to specific situations.

[0028] As shown in FIG. 1, the needle valve 10 has a valve seat 11. Along the axial direction of the connection sleeve 20, a part of the valve seat 11 is located inside the connection sleeve 20, and the part of the valve seat 11 located inside the connection sleeve 20 forms a pipe portion 111, and the pipe portion 111 is fixed to the connection sleeve 20 by welding. That is, by fitting the connection sleeve 20 to the outer wall of the pipe portion 111, the connection sleeve 20 is provided with a larger diameter than when it is inscribed in the inner wall of the pipe portion 111. Furthermore, the breaking torque of the connection sleeve 20 can be increased, it is difficult to fracture, and the vibration resistance performance becomes better.

[0029] The valve seat 11 is provided with a stepped surface 12. The stepped surface 12 is located above the pipe portion 111. When assembling the valve seat 11 and the connection sleeve 20, the connection sleeve 20 abuts against the stepped surface 12, so that the valve seat 11 can be restricted along the axial direction of the connection sleeve 20, and the assembly and welding of the valve seat 11 and the connection sleeve 20 become easier.

[0030] The inner wall of the connecting sleeve 20 and the outer wall of the pipe portion 111 of the valve seat 11 are in close contact with each other, forming a first welded joint 21 at the point of contact, which has a substantially cylindrical surface shape. By setting the axial length of the first welded joint 21 to be greater than 4 mm, sufficient welding depth is ensured, the connecting sleeve 20 and the pipe portion 111 are stably connected, and the welding strength between the needle valve 10 and the connecting sleeve 20 meets the usage requirements. Specifically, the axial length of the first welded joint 21 may be 5 mm, 6 mm, 7 mm, etc.

[0031] The other end of the connecting sleeve 20 is overlapped and joined to a flange hole 31 drilled in the wall of the connecting pipe 30. The flange hole 31 is substantially cylindrical in shape so that it engages with the cylindrical structure of the connecting sleeve 20 for attachment. The outer wall of the connecting sleeve 20 and the inner wall of the flange hole 31 are in close contact with each other in part, forming a second welded joint 22. The second welded joint 22 has a cylindrical surface shape and an axial length greater than 2 mm. Specifically, the axial length of the second welded joint 22 can be 3 mm, 4 mm, 5 mm, etc. By setting the axial length of the second welded joint 22 between the connecting sleeve 20 and the flange hole 31 to meet the set value, the weld strength between the connecting sleeve 20 and the connecting pipe 30 will meet the usage requirements.

[0032] Furthermore, in order to accommodate different welding methods at the first welding location 21 and the second welding location 22, the melting point of the welding material at the first welding location 21 is set lower than the melting point of the welding material at the second welding location 22. By performing furnace brazing at the second welding location 22 to weld and fix the inner wall of the flange hole 31 to the outer wall of the connecting sleeve 20, and then performing flame welding at the first welding location 21 to weld and fix the outer wall of the pipe section 111 to the inner wall of the connecting sleeve 20, it becomes possible to fix the connecting sleeve 20 between the needle valve 10 and the connecting pipe 30 by overlapping.

[0033] Referring to Figure 1, in one embodiment, a plane 101 is defined, which is perpendicular to the axis 102 of the connecting pipe 30, and is positioned such that the projection of the pipe wall of the pipe section 111 on the valve seat 11 onto the plane 101 and the projection of the hole wall 311 of the flange hole 31 onto the plane 101 overlap along the axial direction of the connecting pipe 30. That is, along the axial direction of the connecting sleeve 20, the pipe edge of the pipe section 111 is lower than the hole edge of the flange hole 31, so that the pipe wall of the pipe section 111 and the hole wall 311 of the flange hole 31 overlap on both sides of the connecting sleeve 20. By increasing the wall thickness of the entire overlapping portion, the breaking torque can be increased, the overall connection strength of the connecting sleeve 20 is increased, and the needle valve 10 becomes less likely to break.

[0034] Referring to Figure 2, naturally, in other embodiments, the pipe section 111 may be provided so that the projection of the pipe wall and the projection of the hole wall 311 do not overlap. In one embodiment, a plane 101 is defined, and this plane 101 is perpendicular to the axis 102 of the connecting pipe 30. Along the axial direction of the connecting pipe 30, a predetermined gap 103 is formed between the projection of the pipe edge of the pipe section 111 onto the plane 101 and the projection of the hole edge of the flange hole 31 onto the plane 101, and the distance of the predetermined gap 103 is 3 mm or less. That is, along the axial direction of the connecting sleeve 20, the pipe edge of the pipe section 111 does not exceed 3 mm from the hole edge of the flange hole 31, thereby avoiding breakage due to insufficient strength of the connecting sleeve 20. Specifically, the distance of the predetermined gap 103 can be values ​​such as 1 mm, 2 mm, or 3 mm.

[0035] Along the axial direction of the connecting sleeve 20, the end face of the connecting sleeve 20 away from the needle valve 10 is defined as the lower end face 23. Along the axial direction of the connecting sleeve 20, the bottom end face 1111 (i.e., the free end face) of the pipe section 111 is flush with the lower end face of the connecting sleeve 20. By providing it to be flush, the depth of the overlap joint between the connecting sleeve 20 and the needle valve 10 is increased, improving the connection stability between the needle valve 10 and the connecting sleeve 20.

[0036] Based on the above, the needle valve connection structure 100 for which protection is sought in this application is an improvement over the valve pipe connection structure commonly used in conventional pipeline systems. By providing the connection sleeve 20 in an overlapping configuration between the needle valve 10 and the connecting pipe 30, the axial length of the connection sleeve 20 is shortened and the diameter is increased, the connection strength between the needle valve 10 and the connecting pipe 30 is increased, the breaking torque of the connection sleeve 20 is higher, the needle valve 10 is less likely to break, and the connection sleeve 20 is less likely to rupture even when the compressor is operating, making it more resistant to vibration.

[0037] Each of the technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of each technical feature in the above embodiments are described. However, as long as these combinations of technical features are not contradictory, they should all be considered to be within the scope described herein.

[0038] The above embodiments merely illustrate some of the embodiments of this application, and although their descriptions are relatively specific and detailed, they should not be understood as limiting the scope of the claims of this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the spirit of this application, and all of these are included within the scope of protection of this application. Therefore, the scope of protection of the patent of this application should be in accordance with the attached claims.

Claims

1. The assembly includes a needle valve, a connecting sleeve, and a connecting pipe, the connecting pipe having a flange hole, the connecting sleeve being fixed to the connecting pipe by welding the overlapping portion in the axial direction of the connecting sleeve between the inner circumferential surface of the cylindrical hole wall of the flange hole and the outer circumferential surface of the connecting sleeve inserted into the flange hole, and one end of the connecting sleeve away from the flange hole being welded to the needle valve. Herein, the axial length of the connecting sleeve is 7 mm or more and less than 25 mm, in a needle valve connection structure.

2. The needle valve connection structure according to claim 1, wherein the needle valve is a brass needle valve, the connecting sleeve is a pure copper sleeve, the connecting pipe is a stainless steel pipe, and the axial length of the connecting sleeve is 7 mm or more and less than 10 mm.

3. The needle valve connection structure according to claim 1 or 2, wherein the needle valve has a valve seat, a portion of the valve seat is located within the connecting sleeve along the axial direction of the connecting sleeve, the portion of the valve seat located within the connecting sleeve forms a tubular portion, and the tubular portion is welded and fixed to the connecting sleeve.

4. The needle valve connection structure according to claim 3, wherein a plane perpendicular to the axis of the connecting pipe is defined, and the structure is provided such that the projection of the pipe portion onto the plane and the projection of the hole wall of the flange hole onto the plane overlap along the axial direction of the connecting pipe.

5. The needle valve connection structure according to claim 4, wherein the end face of the pipe portion is provided along the axial direction of the connecting sleeve so as to be flush with the lower end face of the connecting sleeve.

6. The needle valve connection structure according to claim 3, wherein a plane perpendicular to the axis of the connecting pipe is defined, and a predetermined gap is formed along the axial direction of the connecting pipe between the projection of the pipe opening edge of the pipe section onto the plane and the projection of the hole opening edge of the flange hole onto the plane, and the distance of the predetermined gap is 1 mm or more and 3 mm or less.

7. The needle valve connection structure according to claim 3, wherein the valve seat is located above the pipe portion and has a stepped surface that, by contacting the connecting sleeve, can restrict the valve seat to the connecting sleeve along the axial direction.

8. The needle valve connection structure according to claim 3, wherein a first welding point is formed between the connecting sleeve and the valve seat, and the axial length of the first welding point is greater than 4 mm and less than or equal to 7 mm.

9. The needle valve connection structure according to claim 8, wherein a second welding location is formed between the connecting sleeve and the hole wall of the flange hole, and the axial length of the second welding location is greater than 2 mm and less than or equal to 5 mm.

10. The needle valve connection structure according to claim 9, wherein the melting point of the welding material at the first welding location is lower than the melting point of the welding material at the second welding location.

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