Low-temperature pneumatic stop valve element assembly convenient to machine

Abstract

The utility model provides a low-temperature pneumatic stop valve element assembly convenient to machine, and aims to solve the technical problems that in the prior art, in the machining process, the coaxiality deviation of a valve rod and a connecting pipe is increased, and large machining errors are generated. The low-temperature pneumatic stop valve element assembly convenient to machine comprises a valve rod; the interior of the connecting pipe is of a hollow structure, the valve rod is sleeved with the connecting pipe, the valve rod and the connecting pipe are coaxially arranged, and the inner diameter of the connecting pipe is larger than that of the connecting pipe; a through hole is formed in the supporting piece, the supporting piece is arranged on the connecting pipe, and the outer side face of the supporting piece is connected with the inner wall of the connecting pipe; through holes with the same size as the valve rod are formed in the positioning pieces, the two ends of the valve rod are sleeved with the positioning pieces correspondingly, and the outer side faces of the positioning pieces abut against the two ends of the inner wall of the connecting pipe correspondingly. The detachable positioning pieces are arranged at the two ends of the valve rod, so that the purpose of maintaining the relative positions of the valve rod and the two connecting pipes is achieved, the coaxiality error is prevented from being increased, and the valve rod has the advantage that it is guaranteed that the machining precision is within the allowable range.

Description

Technical Field

[0001] This utility model relates to the technical field of processing valve core assemblies for shut-off valves, and specifically to a low-temperature pneumatic shut-off valve core assembly that is easy to process. Background Technology

[0002] During the manufacturing process of existing cryogenic pneumatic shut-off valves, the valve stem and the two connecting pipes have relatively few connection points. This can easily lead to an increase in the coaxiality deviation of the valve stem and the two connecting pipes, resulting in a large manufacturing error in the entire valve stem assembly and affecting the overall quality of the cryogenic pneumatic shut-off valve. Utility Model Content

[0003] To address the technical problem in existing technologies where the coaxiality deviation between the valve stem and connecting pipe increases during processing, resulting in significant processing errors, this utility model provides a low-temperature pneumatic shut-off valve core assembly that is easy to process. By setting detachable positioning components at both ends of the valve stem, the relative positions of the valve stem and the two connecting pipes are maintained, thereby avoiding increased coaxiality errors during processing and ensuring that the processing accuracy is within the allowable range.

[0004] The technical solution of this utility model is:

[0005] A low-temperature pneumatic shut-off valve core assembly that is easy to manufacture includes:

[0006] Valve stem;

[0007] The connecting pipe has a hollow internal structure and is fitted onto the valve stem. The valve stem and the connecting pipe are coaxially arranged, and the inner diameter of the connecting pipe is larger than the inner diameter of the valve stem.

[0008] A support member having a through hole inside and being disposed on the connecting pipe, wherein the outer side of the support member is connected to the inner wall of the connecting pipe;

[0009] The positioning element has a through hole of the same size as the valve stem. The positioning element is respectively sleeved on both ends of the valve stem, and the outer side of the positioning element abuts against both ends of the inner wall of the connecting pipe.

[0010] Optionally, a support member is provided at each end of the connecting pipe, the support member is connected to the end of the connecting pipe, and the support member is connected to the positioning member.

[0011] Optionally, the support member is located in the middle of the pipe.

[0012] Optionally, one end of the connecting pipe is connected to the support member, and the other end of the connecting pipe is provided with a support ring, with the outer side of the positioning member abutting against the inner wall of the support ring.

[0013] Optionally, the positioning member has a structure that protrudes to its side in the middle.

[0014] Optionally, the positioning member has a protrusion structure A and a protrusion structure B on both sides of the middle portion, and the protrusion height of the protrusion structure A is greater than or equal to twice the protrusion height of the protrusion structure B.

[0015] Optionally, one end of the connector is inserted into the through hole, and the depth of insertion of the connector is less than the depth of the through hole;

[0016] The positioning member has a boss structure on one side of its middle section, and the boss structure is inserted into the through hole.

[0017] Optionally, a protrusion C is provided on the other side of the middle part of the positioning member, and the size of the protrusion C is smaller than the size of the boss structure.

[0018] Optionally, the positioning elements have equal widths.

[0019] Optionally, the width of the contact surface between the positioning element and the connecting pipe is greater than or equal to 40% of its overall width.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] By placing the valve stem inside two connecting pipes and connecting the two pipes with a support, and then placing a positioning element at each end of the valve stem, the relative position between the two connecting pipes and the valve stem is made more stable. This avoids increasing the coaxiality error during the valve core machining process, thereby ensuring the quality of the entire cryogenic pneumatic shut-off valve. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is an enlarged schematic diagram of one end of the present invention;

[0025] Figure 3 This is a structural schematic diagram of one of the positioning components;

[0026] Figure 4 This is a structural diagram of another positioning component. Detailed Implementation

[0027] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0028] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Example

[0030] See Figure 1 , Figure 2 and Figure 3 This embodiment discloses a low-temperature pneumatic shut-off valve core assembly that is easy to process, including a valve stem 10, connecting pipes 21 and 22, a support member 31, and positioning members 41 and 42. The valve stem 10 is a straight circular shaft, and the two connecting pipes 21 and 22 are hollow cylindrical structures. The inner diameter of the connecting pipe 21 is smaller than the outer diameter of the connecting pipe 22. The connecting pipe 21 is sleeved on the valve stem 10, and the connecting pipe 22 is sleeved on the outside of the connecting pipe 21. There is a gap between the inner wall of the connecting pipe 22 and the inner wall of the connecting pipe 21. The support member 31 is provided within this gap. The support member 31 has a through hole 321 in its middle and is disposed on the connecting pipe 21. The valve stem passes through the middle of the support member 31, and the outside of the support member 31 is connected to the connecting pipe 22.

[0031] Specifically, positioning elements 41 and 42 are provided at both ends of the connecting pipe 22, that is, positioning elements 41 and 42 are located at both ends of the connecting pipe 22, and the outer walls of positioning elements 41 and 42 abut against both ends of the connecting pipe 22. The interior of positioning elements 41 and 42 each has a through hole for the valve stem 10 to pass through, and the diameter of the through hole inside positioning elements 41 and 42 is equal to the outer diameter of the valve stem 10.

[0032] Additionally, positioning elements 41 and 42 can be removed from between valve stem 10 and pipe 22.

[0033] During the processing of the valve core assembly, positioning elements 41 and 42 are respectively set at both ends of the valve stem 10, making the relative position between the connecting pipes 21 and 22 and the valve stem 10 more stable. This avoids increasing the coaxiality error during the processing of the valve core assembly, thereby ensuring the quality of the entire cryogenic pneumatic shut-off valve.

[0034] After the valve core assembly is machined, the positioning parts 41 and 42 are detached from the valve stem 10 and the connecting pipes 21 and 22 by taking advantage of their detachable nature. This yields a valve core assembly whose coaxiality is not affected. The positioning parts 41 and 42 can also be reused when machining another valve core assembly.

[0035] In one specific embodiment:

[0036] Each end of the connector 21 is provided with a support member 31 and 32. One end of the connector 21 is located in the middle of the connector 22, and the support member 31 is connected to this end of the connector 21. The support member 32 is connected to the other end of the connector 22, and both this end of the connector 21 and the support member 32 are aligned with one end of the connector 22. The support member 32 is connected to the positioning member 41.

[0037] In this embodiment, by providing support members 31 and 32 at both ends of the connecting pipe 21, the relative positions of the connecting pipes 21 and 22 are made more stable.

[0038] Since the inner diameter of the connecting pipe 21 is larger than the outer diameter of the valve stem 10, and other parts are installed in the gap between the connecting pipe 21 and the valve stem 10, the positioning component 41 is designed to assist the connection between the valve stem 10 and the connecting pipes 21 and 22, thereby improving the stability of the relative position between the valve stem 10 and the connecting pipes 21 and 22.

[0039] In another specific embodiment:

[0040] One end of the connecting pipe 22 is connected to the support member 32, and the other end of the connecting pipe 22 is provided with a support ring 50. The outer side of the positioning member 42 abuts against the inner wall of the support ring 50. In this embodiment, the support ring 50 on the valve core assembly can be connected to other components in the valve body. Generally, it can be processed together with the valve core assembly. By abutting the outer side of the support member 32 against the support ring 50, the position of the support ring 50 is restricted, without affecting the positioning of the connecting pipe 22.

[0041] In another specific embodiment:

[0042] The positioning members 41 and 42 have a structure that protrudes to their sides in the middle. This protrusion increases the contact area between the positioning members 41 and 42 and the valve stem 10, thereby improving stability.

[0043] Specifically, the positioning member 42 has protrusions A421 and B422 on both sides of its middle portion, and the protrusion height of protrusion A421 is greater than or equal to twice the protrusion height of protrusion B422. During installation, protrusion A421 is located on the outside of the connector 22, and protrusion B422 is located on the inside of the connector 22.

[0044] One end of the connector 21 is inserted into the through hole 321, and the insertion depth of the connector 21 is less than the depth of the through hole 321. This design improves the strength of the connection between the connector 21 and the support member 32. One side of the middle part of the positioning member 41 has a boss structure 411, which is also inserted into the through hole 321, so that the positioning member 41 can also limit the axial position of the connector 21.

[0045] In another specific embodiment:

[0046] On the other side of the middle part of the positioning member 41, there is a protrusion structure C412. The size of the protrusion structure C412 is smaller than the size of the boss structure 411. In this embodiment, the protrusion structure C412 has the same function as the aforementioned protrusion structures A421 and 422, which is to increase the contact area between the positioning member 41 and the valve stem 10.

[0047] In another specific embodiment:

[0048] To facilitate the selection of blanks for positioning parts 41 and 42, the widths of positioning parts 41 and 42 are designed to be equal.

[0049] In another specific embodiment:

[0050] The contact surface width between the positioning element 42 and the connecting pipe 22 is greater than or equal to 40% of its overall width. Since the wall thickness of the connecting pipe 22 is relatively thin, this design can avoid the problem of structural deformation of the connecting pipe 22 caused by the small contact area between the connecting pipe 22 and the positioning element 41.

[0051] The embodiments described above merely illustrate specific implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A valve core assembly for a cryogenic pneumatic shut-off valve that is easy to process, characterized in that, include: Valve stem (10); Connectors (21, 22) have a hollow internal structure and are fitted onto the valve stem (10). The valve stem (10) and the connectors (21, 22) are coaxially arranged. The inner diameter of the connector (22) is larger than the inner diameter of the connector (21). A support member (31) has a through hole (321) inside and is provided on the pipe (21). The outer side of the support member (31) is connected to the inner wall of the pipe (22). Positioning elements (41, 42) have through holes of the same size as the valve stem (10) inside. The positioning elements (41, 42) are respectively sleeved on both ends of the valve stem (10), and the outer surfaces of the positioning elements (41, 42) abut against both ends of the inner wall of the connecting pipe (22).

2. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 1, characterized in that, The connector (21) has a support member (31, 32) at each end. The support member (32) is connected to the end of the connector (22) and the support member (32) is connected to the positioning member (41).

3. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 2, characterized in that, The support member (31) is located in the middle of the connecting pipe (22).

4. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 2, characterized in that, One end of the connector (22) is connected to the support member (32), and a support ring (50) is provided on the other end of the connector (22). The outer side of the positioning member (42) abuts against the inner wall of the support ring (50).

5. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 1, characterized in that, The positioning element (41, 42) has a structure that protrudes to its side in the middle.

6. The easily manufacturable cryogenic pneumatic shut-off valve core assembly according to any one of claims 1-5, characterized in that, The positioning member (42) has a protruding structure A (421) and a protruding structure B (422) on both sides of the middle part, and the protrusion height of the protruding structure A (421) is greater than or equal to twice the protrusion height of the protruding structure B (422).

7. The easily manufacturable cryogenic pneumatic shut-off valve core assembly according to any one of claims 1-5, characterized in that: One end of the connector (21) is inserted into the through hole (321), and the depth of insertion of the connector (21) is less than the depth of the through hole (321); The positioning member (41) has a boss structure (411) on one side of the middle part, and the boss structure (411) is inserted into the through hole (321).

8. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 7, characterized in that, The positioning member (41) has a protruding structure C (412) on the other side of the middle part, and the size of the protruding structure C (412) is smaller than the size of the boss structure (411).

9. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 1, characterized in that, The positioning elements (41, 42) have equal widths.

10. The easily processed cryogenic pneumatic shut-off valve core assembly according to claim 1, characterized in that, The contact surface width between the positioning element (42) and the connecting pipe (22) is greater than or equal to 40% of its overall width.

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