Simple fixing shaft structure for straight stroke

Abstract

The utility model relates to a simple fixing shaft structure for straight stroke, which comprises an external thread limiting piece, an internal thread fixing seat and a stroke shaft, the external thread limiting piece and the internal thread fixing seat are connected through threads, and the stroke shaft penetrates through the external thread limiting piece and extends into a shaft hole of the internal thread fixing seat. The internal thread fixing base is provided with a wedging face, the external thread limiting piece is provided with a pressing face, a fixing groove is formed in the stroke shaft, a circular check ring is arranged in the fixing groove, and the circular check ring is pressed and fixed to the connecting position of the external thread limiting piece, the internal thread fixing base and the stroke shaft through the fixing groove, the pressing face and the wedging face. The utility model has the beneficial effects of simple structure, convenience in processing, reliability in fixed connection, good sealing performance, low cost and wide applicability, and is suitable for all environments and various types of valve body structures.

Description

Technical Field

[0001] The utility model relates to the technical field of linear travel shaft fixing, in particular to a simple linear travel fixed shaft structure. Background Art

[0002] During the movement of the air valve, the stroke shaft connecting the valve plate moves linearly in the stroke cavity. The traditional stroke shaft is connected to the limit piece in the stroke cavity by a threaded connection. The thread needs to be processed on the stroke shaft and the shaft is made into a stepped shaft for easy positioning. The threaded connection is affected by the movement of the stroke shaft and often becomes disengaged and loses the connection performance. The stepped shaft weakens the strength of the shaft, which is prone to production accidents such as broken shaft. In addition, the sealing performance between the stroke shaft and the limit piece fixed by the threaded connection is not good, and dust is easily introduced into the stroke cavity, affecting the connection between the stroke shaft and the limit piece, affecting the smooth reciprocating motion of the stroke shaft, affecting the operation of the air valve, and severely limiting the use range of the air valve. Summary of the invention

[0003] In order to solve the technical problem of difficulty in fixing and sealing the stroke shaft and the limit piece, the utility model provides a simple fixed shaft structure for straight stroke, by arranging a fixing groove on the stroke shaft, the fixing groove cooperates with the pressing surface of the external thread limit piece and the wedging surface of the internal thread fixed seat to press the circular retaining ring into the fixing groove, the circular retaining ring and the threaded connection cooperate to fix the stroke shaft, the external thread limit piece and the internal thread fixed seat to achieve fixation between the stroke shaft and the limit piece, the elastic deformation of the circular retaining ring and the sealing ring cooperate to achieve sealing of the fixed shaft structure to prevent foreign matter from entering the stroke cavity, the structure is simple in structure, easy to process, reliable in fixing and connection, good in sealing, low in cost, suitable for all environments and various types of valve body structures, and has wide applicability.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A simple fixed shaft structure for straight travel comprises an external thread limiter, an internal thread fixed seat and a travel shaft, wherein the external thread limiter and the internal thread fixed seat are connected by threads, and the travel shaft passes through the internal thread fixed seat and extends into the axial hole of the external thread limiter, a wedging surface is provided at the bottom of the internal thread hole of the internal thread fixed seat, a pressing surface is provided at the axial hole position of the external thread limiter, a fixing groove is provided on the travel shaft, a circular retaining ring is provided in the fixing groove, and the circular retaining ring is pressed and fixed at the connection position of the external thread limiter, the internal thread fixed seat and the travel shaft by the fixing groove, the pressing surface and the wedging surface, a limiting plate is provided at the top of the external thread limiter with a limiting space, and the internal thread fixed seat is connected to an elastic plate.

[0006] Furthermore, a sealing ring is arranged between the internal thread fixing seat and the elastic plate.

[0007] Furthermore, a boss is provided on the top of the external thread limiter.

[0008] Furthermore, an anti-collision sheet is provided on one side of the limiting plate close to the external thread limiting member.

[0009] Furthermore, the circular retaining ring is an elastic steel ring with elastic deformation.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] 1. The circular retaining ring is pressed into the fixed groove of the stroke shaft through the wedging surface and the pressing surface. The circular retaining ring and the threaded connection are used to fix the stroke shaft, the external thread limiter and the internal thread fixing seat together. The circular retaining ring is elastically deformed during the pressing process, and prestress is generated during the fixed connection process. The fixed connection is tighter and the connection reliability is high. The stroke shaft does not need to be processed into a stepped shaft and an external thread. The strength of the stroke shaft is improved, the range of the stroke shaft output force is wider, the applicability is wider, the processing is simple and convenient, and the processing cost is reduced.

[0012] 2. The circular retaining ring elastically deforms and blocks the connection position between the stroke shaft, the external thread limiter and the internal thread fixed seat, playing a sealing role. It cooperates with the sealing ring set at the bottom of the internal thread fixed seat to seal. The connection position of the stroke shaft is completely sealed under double sealing, with good sealing performance, preventing dust from entering the stroke cavity, and ensuring smooth reciprocating motion of the stroke shaft.

[0013] 3. The external thread limiter, the internal thread fixed seat and the stroke shaft are all detachably connected. The external thread limiter can be replaced freely and is suitable for stroke valves with different valve plate stroke lengths. The fixed shaft structure has a wide range of applications and strong practicality, and is not restricted by site and environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of a simple fixed shaft structure for linear travel.

[0015] Figure 2 It is a schematic diagram of the circular retaining ring assembly structure described in the utility model.

[0016] In the figure: 1. External thread limiter; 2. Internal thread fixing seat; 3. Circular retaining ring; 4. Travel shaft; 5. Sealing ring; 6. Elastic plate; 7. Wedging surface; 8. Fixing groove; 9. Pressing surface; 10. Threaded connection; 11. Boss; 12. Limiting space; 13. Anti-collision sheet; 14. Limiting plate. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0018] like Figure 1-Figure 2As shown, the working principle of a simple fixed shaft structure for straight stroke is as follows: the external thread limiter 1 and the internal thread fixed seat 2 are matched with the threaded connection 10, the external thread limiter 1 is rotated downward, the wedging surface 7 at the bottom of the threaded hole of the internal thread fixed seat 2 and the pressing surface 9 at the axial hole opening position of the external thread limiter 1 are matched to press the circular retaining ring 3 into the fixed groove 8 of the stroke shaft 4 to play a fixed connection role, the threaded connection 10 and the circular retaining ring 3 are matched to connect the external thread limiter 1, the internal thread fixed seat 2 and the stroke shaft 4 together, the connection is firm and reliable, the deformation seal of the circular retaining ring 3 and the double matching seal of the sealing ring 5 seal the entire fixed shaft structure with good sealing performance, the structure is simple to connect, convenient to process, low in cost and wide in adaptability.

[0019] like Figure 1-Figure 2 As shown, a simple fixed shaft structure for linear travel includes an external thread limiter 1, an internal thread fixed seat 2 and a travel shaft 4. The external thread limiter 1 and the internal thread fixed seat 2 are connected by a thread 10. The external thread limiter 1 is installed in the threaded hole of the internal thread fixed seat 2 through the threaded connection 10. The travel shaft 4 passes through the internal thread fixed seat 2 and extends into the shaft hole of the external thread limiter 1. The bottom of the internal thread hole of the internal thread fixed seat 2 is provided with a wedging surface 7. The shaft hole position of the external thread limiter 1 is provided with a pressure relief. Tight surface 9, a fixing groove 8 is provided on the stroke shaft 4, a circular retaining ring 3 is arranged in the fixing groove 8, and the circular retaining ring 3 is pressed and fixed by the fixing groove 8, the pressing surface 9 and the wedging surface 7 at the connection position of the external thread limiter 1, the internal thread fixing seat 2 and the stroke shaft 4. There is a connection space for the three connections between the stroke shaft 4, the internal thread fixing seat 2 and the external thread limiter 1, and the circular retaining ring 3 is arranged in this connection space. Before the circular retaining ring 3 is pressed into the fixing groove 8 of the stroke shaft 4, the stroke shaft 4 can move freely. Under the force of the threaded fit and tightening of the external threaded stopper 1 and the internal threaded fixing seat 2, the distance between the wedging surface 7 and the pressing surface 8 is reduced, and the circular retaining ring 3 arranged at the position of the fixed groove 8 is compressed. Under the guiding action of the wedging surface 7 and the pressing surface 9, the circular retaining ring 3 is pressed into the fixed groove 8 of the stroke shaft 4, and the circular retaining ring 3 is compressed and deformed, a part of which is fixedly connected in the fixed groove 8, and a part of which is sealed in the connecting space between the external threaded stopper 1, the internal threaded fixing seat 2 and the stroke shaft 4, that is, it plays a fixing role in connecting the three, and also plays a sealing role. The top of the external threaded stopper 1 is separated by a limiting space 12 to set a limiting plate 14, and the internal threaded fixing seat 2 is connected to the elastic plate 6. The limiting space 12 between the limiting plate 14 and the top of the external threaded stopper 1 is the maximum stroke of the valve allowing the stroke shaft 4 to run in a straight line. When the stroke shaft 4 runs upward, it drives the external threaded stopper 1, the internal threaded fixing seat 2 and the elastic plate 6 to be lifted upward together. When the valve plate falls, the elastic pre-tightening force of the elastic plate 6 pulls the fixed shaft structure downward as a whole and falls back quickly.

[0020] like Figure 1As shown, further, a sealing ring 5 is arranged between the internal thread fixing seat 2 and the elastic plate 6, and the sealing ring 5 and the elastically deformed circular retaining ring 3 together seal the entire fixed shaft structure, and the sealing performance is good.

[0021] like Figure 1 As shown, further, a boss 11 is arranged on the top of the external thread limiter 1, and the boss 11 is used to connect the disassembly tool, so that the disassembly and installation are convenient and quick. The external thread limiters 1 with different heights are suitable for air valves with different stroke lengths, and the fixed shaft structure has a wide range of applications.

[0022] like Figure 1 As shown, further, an anti-collision sheet 13 is provided on one side of the limiting plate 14 close to the external thread limiting member 1 .

[0023] Furthermore, the circular retaining ring 3 is an elastic steel ring with elastic deformation. The elastic steel ring can be deformed when the circular retaining ring 3 is subjected to force, and a pre-tightening force is generated during the deformation process, so that the fixed connection is better, and the elastic deformation also makes the sealing of the connection position better.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A simple fixed shaft structure for linear travel, characterized in that: It includes an external thread limiter, an internal thread fixing seat and a travel shaft, the external thread limiter and the internal thread fixing seat are connected by threads, the travel shaft passes through the internal thread fixing seat and extends into the axial hole of the external thread limiter, a wedging surface is provided at the bottom of the internal thread hole of the internal thread fixing seat, a pressing surface is provided at the axial hole position of the external thread limiter, a fixing groove is provided on the travel shaft, a circular retaining ring is provided in the fixing groove, the circular retaining ring is pressed and fixed at the connection position of the external thread limiter, the internal thread fixing seat and the travel shaft by the fixing groove, the pressing surface and the wedging surface, a limiting plate is provided at the top of the external thread limiter with a limiting space, and the internal thread fixing seat is connected to the elastic plate.

2. A simple fixed shaft structure for linear travel according to claim 1, characterized in that: A sealing ring is arranged between the internal thread fixing seat and the elastic plate.

3. A simple fixed shaft structure for linear travel according to claim 1, characterized in that: A boss is arranged on the top of the external thread limiter.

4. A simple fixed shaft structure for linear travel according to claim 1, characterized in that: An anti-collision sheet is arranged on one side of the limiting plate close to the external thread limiting piece.

5. The simple fixed shaft structure for linear travel according to claim 1, characterized in that: The circular retaining ring is an elastic steel ring with elastic deformation.

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