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 Applications) This application claims priority to a Chinese patent application filed on October 26, 2022, bearing application number 202222837892.3 and entitled "Needle Valve Connection Structure," the entire text of which is incorporated herein by reference.

[0002] The present application relates to the technical field of valves, and in particular to a needle valve connection structure. [Background technology]

[0003] Needle valves are commonly used in pipeline systems to open and close pipeline passages. They include a valve seat and a valve pipe built into the valve seat. When a spindle is applied to a pipeline system, the valve pipe is typically welded to a connecting pipe in the pipeline system. However, because the valve pipe is relatively long and has a relatively small diameter, the hardness of the valve pipe may be reduced after welding, reducing the connection strength between the needle valve and the connecting pipe. Summary of the Invention

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

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

[0006] Here, the axial length of the connecting 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, a portion of the valve seat is located within the connecting sleeve along the axial direction of the connecting sleeve, and the portion of the valve seat located within 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 communicating pipe is defined, and a projection of the pipe portion onto the plane and a projection of the hole wall of the flange hole onto the plane overlap along the axial direction of the communicating pipe.

[0010] In one embodiment, the end face of the tube portion is flush with the lower end face of the connection sleeve along the axial direction of the connection sleeve.

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

[0012] In one embodiment, the valve seat is located above the pipe section and has a stepped surface that can abut against the connecting sleeve to restrict the valve seat to the connecting sleeve in the axial direction.

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

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

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

[0016] The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the application will become apparent from the description, drawings, and claims. [Brief explanation of the drawings]

[0017] In order to more clearly explain the technical aspects of the embodiments of the present application or related art, drawings necessary for use in the description of the embodiments or related art are briefly introduced below. However, the drawings in the following description are only some of the embodiments of the present application, and it is clear that a person skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] [Figure 1] FIG. 1 is a schematic diagram of a needle valve connection structure provided in the present application. [Figure 2] FIG. 10 is a schematic diagram of another embodiment of a needle valve connection structure provided in the present application;

[0019] 100 needle valve connection structure, 10 needle valve, 11 valve seat, 111 pipe section, 1111 end face, 12 step surface, 20 connection sleeve, 21 first welding point, 22 second welding point, 23 lower end surface, 30 communicating pipe, 31 flange hole, 311 hole wall, 101 flat surface, 102 axis, 103 specified gap. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to make the above-mentioned objects, features, and advantages of the present application clearer and easier to understand, specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, various specific details are described to facilitate a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without going against the content of the present application, so the present application is not limited by the specific examples disclosed below.

[0021] It should be understood that when an assembly is referred to as being "fixed" or "mounted" to another assembly, it may be directly fixed to the other assembly, or there may be an intervening assembly present. When an assembly is referred to as being "connected" to another assembly, it may be directly connected to the other assembly, or there may be an intervening assembly present as well. The terms "vertical," "horizontal," "top," "bottom," "left," "right," and similar expressions used in the specification of this application are for descriptive purposes only and do not represent the only embodiments.

[0022] Furthermore, the terms "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying relative importance or as implicitly designating the number of technical features indicated. Thus, a feature qualified by "first" or "second" can explicitly or implicitly include at least one of that feature. In the description of this application, "plurality" means at least two, e.g., two, three, etc., unless explicitly and specifically limited.

[0023] In this application, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact with each other, or that the first and second features are in indirect contact with each other via an intermediate medium. Furthermore, a first feature being "above," "above," or "upper side" of 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 higher than that of the second feature. A first feature being "below," "below," or "below" 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 have the same meaning as commonly understood by those skilled in the art of this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the application. The term "and / or" used in the specification of this application includes one or more of any and all combinations of the associated listed items.

[0025] 1, the present application provides a needle valve connection structure 100, which includes a needle valve 10, a connecting sleeve 20, and a communicating pipe 30, the communicating 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 the 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. With this design, the axial length of the connecting sleeve 20 is relatively short, which increases the breaking torque and further improves the connection strength between the needle valve 10 and the communicating pipe 30.

[0026] In one embodiment, the needle valve 10 is a brass needle valve, the connecting sleeve 20 is a pure copper sleeve, and the connecting pipe 30 is a stainless steel pipe. Because the melting point of brass is less than 900°C and the welding temperature of typical stainless steel pipes is above 1000°C, using a pure copper sleeve with a relatively high melting point for the connecting sleeve 20 reduces the material cost of the pipeline system and is compatible with the welding temperature of the connecting pipe 30, allowing the brass needle valve to be welded to the stainless steel pipe via the pure copper sleeve. Of course, in other embodiments, the needle valve 10 can be made of other materials such as pure copper or copper alloy, the connecting sleeve 20 can be made of other materials such as stainless steel that allow the needle valve 10 and the connecting pipe 30 to be welded simultaneously, and the connecting pipe 30 can be made of other materials such as pure copper, and these can be selected according to actual circumstances.

[0027] In one embodiment, the axial length of the connecting sleeve 20 is less than 10 mm. The connecting sleeve 20 has a generally cylindrical shape so that the connecting sleeve 20 can be lap-jointed to the needle valve 10 and the connecting pipe 30 after installation. This shortens the distance between the needle valve 10 and the connecting pipe 30, increases the breaking torque of the connecting sleeve 20, makes it easier to meet the strength requirements during use, and is less likely to break, i.e., improves the connection stability between the needle valve 10 and the connecting pipe 30. Specifically, the axial length of the connecting sleeve 20 can be 7 mm, 8 mm, 9 mm, etc. Of course, the connecting sleeve 20 may have other shapes, such as a rectangular cylindrical shape, that can be connected to the needle valve 10 and the connecting pipe 30 depending on the specific situation.

[0028] 1, the needle valve 10 has a valve seat 11, a portion of which is located within the connecting sleeve 20 along the axial direction of the connecting sleeve 20, and the portion of the valve seat 11 located within the connecting sleeve 20 forms a pipe section 111 which is welded to the connecting sleeve 20. That is, by fitting the connecting sleeve 20 onto the outer wall of the pipe section 111, the connecting sleeve 20 is provided with a larger diameter than when it is inscribed within the inner wall of the pipe section 111. Furthermore, the breaking torque of the connecting sleeve 20 can be increased, making it less likely to break and more vibration-resistant.

[0029] The valve seat 11 has a stepped surface 12, which is located above the pipe section 111. When assembling the valve seat 11 and the connecting sleeve 20, the connecting sleeve 20 abuts against the stepped surface 12, thereby restricting the valve seat 11 along the axial direction of the connecting sleeve 20, making it easier to assemble and weld the valve seat 11 and the connecting sleeve 20 together.

[0030] The inner wall of the connecting sleeve 20 and the outer wall of the pipe portion 111 of the valve seat 11 are brought into close contact with each other, forming a first weld 21 at the contact point, which has a generally cylindrical surface shape. By setting the axial length of the first weld 21 to be greater than 4 mm, a 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 weld 21 may be 5 mm, 6 mm, 7 mm, etc.

[0031] The other end of the connection sleeve 20 is lapped into a flange hole 31 drilled in the wall of the communicating pipe 30. The flange hole 31 has a generally cylindrical shape so that it can be fitted into the cylindrical structure of the connection sleeve 20 for attachment. The outer wall of the connection sleeve 20 and the inner wall of the flange hole 31 are partially intimately attached to each other, forming a second weld 22. The second weld 22 has a cylindrical surface and an axial length greater than 2 mm. Specifically, the axial length of the second weld 22 can be 3 mm, 4 mm, 5 mm, etc. By setting the axial length of the second weld 22 between the connection sleeve 20 and the flange hole 31 to a predetermined value, the weld strength between the connection sleeve 20 and the communicating pipe 30 meets the required usage requirements.

[0032] Furthermore, to allow the first welding point 21 and the second welding point 22 to be adapted to different welding methods, the melting point of the welding material at the first welding point 21 is lower than the melting point of the welding material at the second welding point 22. Furnace brazing is performed at the second welding point 22 to weld and fix the inner wall of the flange hole 31 to the outer wall of the connection sleeve 20, and then flame welding is performed at the first welding point 21 to weld and fix the outer wall of the pipe portion 111 to the inner wall of the connection sleeve 20, thereby making it possible to fix the connection sleeve 20 between the needle valve 10 and the communicating pipe 30 by a lap joint.

[0033] 1 , in one embodiment, a plane 101 is defined, which is perpendicular to the axis 102 of the connecting pipe 30. The projection of the pipe wall of the pipe section 111 of 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 are aligned along the axial direction of the connecting pipe 30. That is, the pipe wall of the pipe section 111 and the hole wall 311 of the flange hole 31 are aligned along the axial direction of the connecting sleeve 20, and the pipe opening edge of the pipe section 111 is lower than the opening edge of the flange hole 31. The increased thickness of the entire overlapping portion increases the breaking torque, improves the overall connection strength of the connecting sleeve 20, and makes the needle valve 10 less susceptible to being twisted off.

[0034] 2 , in other embodiments, the projection of the pipe wall of the pipe portion 111 and the projection of the hole wall 311 may not overlap. In one embodiment, a plane 101 is defined, perpendicular to the axis 102 of the connecting pipe 30. A predetermined gap 103 is formed along the axial direction of the connecting pipe 30 between the projection of the pipe rim of the pipe portion 111 onto the plane 101 and the projection of the hole rim of the flange hole 31 onto the plane 101. The distance of the predetermined gap 103 is 3 mm or less. That is, the pipe rim of the pipe portion 111 is set to be no more than 3 mm from the hole rim of the flange hole 31 along the axial direction of the connecting sleeve 20 to prevent breakage due to insufficient strength of the connecting sleeve 20. Specifically, the distance of the predetermined gap 103 may be 1 mm, 2 mm, 3 mm, etc.

[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, and along the axial direction of the connecting sleeve 20, the bottom end face 1111 (i.e., the free end face) of the pipe portion 111 is flush with the lower end face of the connecting sleeve 20. By arranging them to be flush, the depth of the lap joint between the connecting sleeve 20 and the needle valve 10 becomes deeper, and the connection stability between the needle valve 10 and the connecting sleeve 20 is improved.

[0036] As described above, the needle valve connection structure 100 claimed for protection in this application is an improvement over the valve pipe connection structure commonly used in conventional pipeline systems. The connection sleeve 20 is lap-spliced ​​between the needle valve 10 and the connecting pipe 30, thereby shortening the axial length of the connection sleeve 20 and increasing its diameter, thereby increasing the connection strength between the needle valve 10 and the connecting pipe 30, increasing the breaking torque of the connection sleeve 20, and making the needle valve 10 less likely to be twisted off. Even when the compressor is running, the connection sleeve 20 is less likely to break and is more resistant to vibration.

[0037] The technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but as long as there is no contradiction in the combination of these technical features, any combination should be considered to be within the scope described in this specification.

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

Claims

1. a needle valve, a connection sleeve, and a communication pipe, the communication pipe having a flange hole formed therein, the connection sleeve being fixed to the communication pipe by welding a hole wall of the flange hole to the connection sleeve, and one end of the connection sleeve remote from the flange hole being fixed to the needle valve by welding; Here, the axial length of the connecting sleeve is less than 25 mm.

2. 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 communicating pipe is a stainless steel pipe, and the axial length of the connecting sleeve is less than 10 mm.

3. 3. The needle valve connection structure according to claim 1, 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 to the connecting sleeve.

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

5. The needle valve connection structure according to claim 4 , wherein an end face of the tubular portion is flush with a lower end face of the connection sleeve along the axial direction of the connection sleeve.

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

7. 4. 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 abuts against the connection sleeve to restrict the valve seat to the connection sleeve in the axial direction.

8. 4. The needle valve connection structure according to claim 3, wherein a first welded portion is formed between the connection sleeve and the valve seat, and the axial length of the first welded portion is greater than 4 mm.

9. The needle valve connection structure according to claim 8 , wherein a second welded portion is formed between the connection sleeve and the hole wall of the flange hole, and the axial length of the second welded portion is greater than 2 mm.

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

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