Connecting structure of valve element and valve rod

Abstract

The invention relates to the technical field of valves, and discloses a connecting structure of a valve element and a valve rod. According to the connecting structure of the valve element and the valve rod, an anti-rotation connecting piece is arranged in a connecting base of the valve element, a limiting hole is formed in the anti-rotation connecting piece, and the mounting end of the valve rod penetrates through and extends out of the limiting hole; the valve rod is fixedly connected with the mounting end part through the fastening assembly, so that the valve rod is axially limited and is prevented from rotating relative to the valve core, the looseness or separation caused by the rotation of the valve rod can be effectively prevented, and the structural stability is ensured; the valve rod is matched with the anti-rotation connecting piece through the detachable fastening assembly, the structure is simple, the valve rod or the valve element can be conveniently and independently disassembled or replaced in the later period, and maintenance convenience is improved; through the structural design, reliable connection can be achieved without too high matching precision between the valve rod and the valve element, and the technical requirement in the assembling process is effectively lowered; and the valve body structure is suitable for various types of valve body structures, and has good universality and engineering application prospects.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a connection structure between a valve core and a valve stem. Background Technology

[0002] In the structural design of sleeve control valves, the connection method between the valve core and the valve stem directly affects the valve's opening and closing performance and reliability. To avoid relative rotation between the valve stem and the valve core, existing technologies typically employ a connection structure combining a locating pin and a thread. This connection method involves setting a locating pin hole on one side of the valve core or valve stem, inserting a locating pin to restrict the rotational freedom between the two, and then fixing them together with threads.

[0003] However, in practical applications, the valve core / valve spool structure has certain technical drawbacks. Firstly, because the valve core / valve spool manufacturing process requires high assembly precision, even slight deviations can easily lead to axial misalignment between the valve stem and valve core, affecting the stability of valve opening and closing and its sealing performance. Secondly, when either the valve core or valve stem is damaged, the valve core / valve spool structure is typically non-removable, making it difficult to replace either valve core or valve stem individually, resulting in low maintenance efficiency and increased repair costs. Summary of the Invention

[0004] This invention provides a connection structure for valve core and valve stem to solve the problem that the valve core and valve stem have high requirements for fit and connection, and the replacement of parts is difficult, which leads to increased maintenance costs in the prior art.

[0005] This invention provides a connection structure for a valve core and a valve stem, comprising: a valve stem, a valve core, an anti-rotation connector, and a fastening assembly; the valve stem has an installation end; the valve core's connecting seat has an installation through hole, the installation end passing through the installation through hole and extending to the inner surface of the connecting seat; the anti-rotation connector is disposed inside the valve core and located on one side of the inner surface of the connecting seat, the anti-rotation connector being fixedly connected to the connecting seat, the anti-rotation connector having a limiting hole, the installation end passing through and extending out of the limiting hole, the limiting hole being adapted to restrict the rotation of the valve stem relative to the valve core; the fastening assembly is fixedly connected to the installation end extending out of the limiting hole, the fastening assembly being adapted to axially limit the valve stem.

[0006] Beneficial effects: This invention provides a connection structure for a valve core and valve stem. By incorporating an anti-rotation connector within the valve core's connecting seat, and this connector having a limiting hole, the valve stem's mounting end passes through and extends beyond the limiting hole. It is then fixedly connected to the mounting end via a fastening assembly. This achieves axial limiting of the valve stem and prevents its rotation relative to the valve core, effectively preventing loosening or detachment caused by valve stem rotation and ensuring structural stability. The valve stem engages with the anti-rotation connector via a detachable fastening assembly, resulting in a simple structure that facilitates individual disassembly or replacement of the valve stem or valve core, improving maintenance convenience. The structural design of this invention allows for a reliable connection between the valve stem and valve core without requiring excessively high fitting precision, effectively reducing the technical requirements during assembly. It is applicable to various types of valve body structures, demonstrating good versatility and promising engineering applications.

[0007] According to some embodiments of the present invention, one end of the mounting end that extends out of the inner surface of the connector is a protruding section, the length of which is greater than the axial thickness of the anti-rotation connector.

[0008] According to some embodiments of the present invention, the limiting hole is an oblong hole, the protruding section forms mounting planes on opposite sides that can cooperate with the oblong hole, and the protruding section is provided with external threads on its circumference other than the mounting planes.

[0009] According to some embodiments of the present invention, the fastening assembly includes a first nut and a second nut, which are sequentially threaded to the protruding section along the axial direction of the valve stem and are mutually abutted.

[0010] According to some embodiments of the present invention, the connection structure between the valve core and the valve stem further includes a pin for connecting the valve stem and the anti-rotation connector; or for connecting the valve stem and the valve core to prevent the valve stem from rotating relative to the valve core.

[0011] According to some embodiments of the present invention, the connection structure between the valve core and the valve stem further includes a locking member, the anti-rotation connector is provided with a first connection hole, the valve core is provided with a second connection hole, and the locking member passes through the first connection hole and the second connection hole to be adapted to fasten the anti-rotation connector to the valve core.

[0012] According to some embodiments of the present invention, the limiting hole is located in the axial direction of the anti-rotation connector, and multiple first connecting holes are provided. The multiple first connecting holes are arranged in a circumferential array with the axis of the limiting hole as the center. The number of the locking member, the first connecting hole, and the second connecting hole are the same.

[0013] According to some embodiments of the present invention, the locking element is a screw.

[0014] According to some embodiments of the present invention, the anti-rotation connector and the inner surface of the connector are fixedly connected by spot welding.

[0015] According to some embodiments of the present invention, the outer surface of the connecting seat is provided with a guide boss; or the outer surface of the connecting seat is flush with the end face of the valve core, and a guide groove is provided axially from the outer surface of the connecting seat. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connection structure between the valve core and the valve stem in some embodiments of the present invention; Figure 2 This is a schematic diagram of the anti-rotation connector in some embodiments of the present invention; Explanation of reference numerals in the attached figures: 1. Valve stem; 11. Connecting end; 111. Extended section; 2. Valve core; 21. Connecting seat; 211. Guide boss; 3. Anti-rotation connector; 31. Limiting hole; 32. First connecting hole; 4. Fastening assembly; 5. Locking component; 6. Pin. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figure 1 and Figure 2As shown, the present invention provides a connection structure between a valve core 2 and a valve stem 1, comprising: a valve stem 1, a valve core 2, an anti-rotation connector 3, and a fastening assembly 4; the valve stem 1 is provided with an installation end; the connecting seat 21 of the valve core 2 is provided with an installation through hole, the installation end passing through the installation through hole and extending to the inner surface of the connecting seat 21; the anti-rotation connector 3 is disposed inside the valve core 2 and located on one side of the inner surface of the connecting seat 21, the anti-rotation connector 3 is fixedly connected to the connecting seat 21, the anti-rotation connector 3 is provided with a limiting hole 31, the installation end passing through and extending out of the limiting hole 31, the limiting hole 31 is suitable for restricting the rotation of the valve stem 1 relative to the valve core 2; the fastening assembly 4 is fixedly connected to the installation end extending out of the limiting hole 31, the fastening assembly 4 is suitable for axially limiting the valve stem 1.

[0020] Specifically, by providing an anti-rotation connector 3 within the connecting seat 21 of the valve core 2, and the anti-rotation connector 3 having a limiting hole 31, the mounting end of the valve stem 1 passes through and extends out of the limiting hole 31, and is fixedly connected to the mounting end by a fastening assembly 4, thereby achieving axial limiting of the valve stem 1 and preventing its rotation relative to the valve core 2. This effectively prevents loosening or detachment caused by the rotation of the valve stem 1, ensuring structural stability. The valve stem 1 cooperates with the anti-rotation connector 3 through the detachable fastening assembly 4, resulting in a simple structure that facilitates the separate disassembly or replacement of the valve stem 1 or valve core 2 in the future, improving maintenance convenience. Through structural design, this invention enables a reliable connection between the valve stem 1 and the valve core 2 without requiring excessively high fitting precision, effectively reducing the technical requirements during assembly. It is applicable to various types of valve body structures and has good versatility and engineering application prospects.

[0021] In some embodiments of the present invention, one end of the mounting end extending from the inner surface of the connector 21 is a protruding section 111, and the length of the protruding section 111 is greater than the axial thickness of the anti-rotation connector 3.

[0022] Specifically, by setting the length of the protruding section 111 to be greater than the axial thickness of the anti-rotation connector 3, sufficient space is provided for the installation of the fastening assembly 4. The protruding section 111 exceeding the thickness of the anti-rotation connector 3 ensures that the fastening assembly 4 can fully engage the installation end, enhancing the reliability of the fastening connection and avoiding the risk of loosening or falling off. Furthermore, the longer protruding section 111 allows for a certain distance between the fastening assembly 4 and the anti-rotation connector 3, helping to disperse stress concentration and improve the mechanical stability of the entire connection structure. By setting up a protruding section 111 with a margin, it is possible to adapt to fastening components 4 of different sizes or forms, thereby improving the modular design capability and applicability of the overall structure.

[0023] In some embodiments of the present invention, the limiting hole 31 is an oblong hole, and the protruding section 111 forms mounting planes on opposite sides that can cooperate with the oblong hole. The protruding section 111 has external threads on its circumference other than the mounting plane.

[0024] Specifically, the oblong hole and the mounting plane of the protruding section 111 cooperate with each other to form a surface-to-surface contact relationship. Compared with the traditional round hole and cylindrical fit, this can more effectively restrict the rotation of the valve stem 1 relative to the valve core 2 and improve the anti-rotation effect. The setting of the mounting plane ensures that the valve stem 1 is automatically positioned after being inserted into the limiting hole 31, avoiding rotational misalignment and improving the overall assembly accuracy. By setting external threads on the circumference of the protruding section 111 other than the mounting plane, it is easy to fasten the fastening component 4 with its threads, thereby achieving axial limiting of the valve stem 1 and making the connection more secure and reliable.

[0025] In some embodiments of the present invention, the fastening assembly 4 includes a first nut and a second nut, which are sequentially threaded to the protruding section 111 along the axial direction of the valve stem 1 and are mutually tightened.

[0026] Specifically, the first nut and the second nut are tightened together to form a double-nut anti-loosening structure, which can effectively prevent the single nut from loosening due to vibration or pressure fluctuations during valve operation, improve the long-term stability of the connection structure, and the double-nut structure can provide greater axial clamping force, further enhancing the fixing ability of valve stem 1 in the axial direction and preventing it from axial displacement due to external force or medium pressure.

[0027] By adjusting the fastening position between the two nuts, the axial preload can be finely adjusted to meet the assembly requirements under different working conditions. At the same time, it is not easy to loosen after locking, which improves the structural reliability. Since the double nut structure has good anti-loosening performance, it can significantly reduce the risk of structural failure caused by loosening, thereby reducing maintenance frequency and maintenance costs.

[0028] In some embodiments of the present invention, the connection structure between the valve core 2 and the valve stem 1 further includes a pin 6, which is used to connect the valve stem 1 and the anti-rotation connector 3; or to connect the valve stem 1 and the valve core 2 to prevent the valve stem 1 from rotating relative to the valve core 2.

[0029] Specifically, the valve stem 1 is mechanically connected to the anti-rotation connector 3 or the valve core 2 by the pin 6, forming an additional anti-rotation path. This can further enhance the anti-rotation effect on the basis of the original limit hole 31 and the plane fit, and avoid the slight rotation caused by component wear or gaps. With the anti-rotation function already achieved in the existing structure, the addition of the pin 6 realizes a double or multiple anti-rotation protection mechanism, which significantly improves the stability and safety of the overall structure under complex working conditions.

[0030] In some embodiments of the present invention, the connection structure between the valve core 2 and the valve stem 1 further includes a locking member 5, the anti-rotation connector 3 is provided with a first connection hole 32, the valve core 2 is provided with a second connection hole, and the locking member 5 passes through the first connection hole 32 and the second connection hole to be suitable for fastening the anti-rotation connector 3 and the valve core 2.

[0031] Specifically, by directly connecting the anti-rotation connector 3 and the valve core 2 with the locking component 5 to form an integral structure, the fixing strength between the two can be significantly improved, preventing the anti-rotation connector 3 from shifting or loosening during long-term use. The locking component 5 provides a stable mechanical connection, effectively ensuring the continuous effectiveness of the anti-rotation function, thereby indirectly improving the connection stability between the valve stem 1 and the valve core 2.

[0032] Locking component 5 can be a conventional fastener, such as screws, rivets or pins, which is easy to install, suitable for mass assembly production, and convenient for later maintenance and disassembly, which is conducive to the standardization of the structure and the improvement of maintainability. In some embodiments of the present invention, the limiting hole 31 is located in the axial direction of the anti-rotation connector 3, and multiple first connecting holes 32 are provided. The multiple first connecting holes 32 are arranged in a circumferential array with the axis of the limiting hole 31 as the center. The number of locking member 5, first connecting holes 32 and second connecting holes are the same.

[0033] Specifically, multiple locking components 5 are distributed circumferentially along the axis of the limiting hole 31, so that the anti-rotation connector 3 and the valve core 2 are subjected to uniform force in the circumferential direction, which can effectively offset the structural deformation caused by off-center load or uneven torque, and improve the stability of the overall connection. The multi-point locking structure of the circumferential array can effectively suppress the risk of loosening caused by vibration or fatigue of single-point connection, and significantly improve the anti-loosening reliability of the structure during long-term operation.

[0034] By having multiple sets of locking parts 5 jointly bear the connection load, stress concentration can be dispersed, and the anti-rotation connection part 3 can be enhanced in the axial and circumferential directions to resist shear and torsion, ensuring the long-term effectiveness of the anti-rotation function. Multiple locking points are symmetrically arranged around the axis of the limiting hole 31, which is conducive to automatic positioning and alignment during the assembly process. It can compensate for dimensional errors in the manufacturing and assembly process to a certain extent and improve assembly accuracy.

[0035] In some embodiments of the present invention, the anti-rotation connector 3 and the inner surface of the connector 21 are fixedly connected by spot welding.

[0036] Specifically, based on the original locking component 5 connection, spot welding is used to achieve a local metallurgical bond between the anti-rotation connector 3 and the valve core 2 connecting seat 21, constructing a more robust integrated connection structure, enhancing shear and tensile strength. The spot welding connection can effectively prevent the anti-rotation connector 3 from loosening or slightly moving due to long-term vibration, thermal expansion and contraction, or hydraulic shock, which is conducive to maintaining the long-term stability of the valve stem 1's anti-rotation function.

[0037] Spot welding is used as a secondary fixing method, which, together with mechanical fasteners, forms a dual connection path. Even if the locking part 5 fails or comes loose, it can still maintain the basic positioning function of the anti-rotation connector 3, thereby improving the safety and reliability of the overall structure.

[0038] In some embodiments of the present invention, the outer surface of the connecting seat 21 is provided with a guide boss 211; or the outer surface of the connecting seat 21 is flush with the end face of the valve core 2, and a guide groove is provided axially from the outer surface of the connecting seat 21.

[0039] Specifically, the guide boss 211 or guide groove structure can play a guiding and limiting role during installation, effectively assisting the valve core 2 or its related components in quick and accurate positioning, and reducing assembly errors. When the outer surface of the connecting seat 21 is flush with the end face of the valve core 2 and an axial guide groove is provided, the structure of the connecting area can be more compact and unified, which helps to make the product shape regular and control the size, and improve the overall engineering aesthetics and modular integration of the structure.

[0040] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A connection structure between a valve core and a valve stem, characterized in that, include: The valve stem (1) is provided with an installation end; The valve core (2) has a mounting through hole in its connecting seat (21), and the mounting end passes through the mounting through hole and extends to the inner surface of the connecting seat (21). Anti-rotation connector (3), the anti-rotation connector (3) is disposed inside the valve core (2) and located on one side of the inner surface of the connecting seat (21), the anti-rotation connector (3) is fixedly connected to the connecting seat (21), the anti-rotation connector (3) is provided with a limiting hole (31), the mounting end passes through and extends out of the limiting hole (31), the limiting hole (31) is adapted to restrict the rotation of the valve stem (1) relative to the valve core (2); Fastening assembly (4) is fixedly connected to the mounting end extending from the limiting hole (31), and the fastening assembly (4) is adapted to axially limit the valve stem (1).

2. The connection structure between the valve core and the valve stem according to claim 1, characterized in that, One end of the mounting end that extends out of the inner surface of the connector (21) is a protruding section (111), the length of which is greater than the axial thickness of the anti-rotation connector (3).

3. The connection structure between the valve core and the valve stem according to claim 2, characterized in that, The limiting hole (31) is an oblong hole, and the protruding section (111) forms an mounting plane on opposite sides that can cooperate with the oblong hole. The protruding section (111) has external threads on its circumference other than the mounting plane.

4. The connection structure between the valve core and the valve stem according to claim 3, characterized in that, The fastening assembly (4) includes a first nut and a second nut, which are sequentially threaded to the protruding section (111) along the axial direction of the valve stem (1) and are pressed against each other.

5. The connection structure between the valve core and the valve stem according to any one of claims 1-4, characterized in that, It also includes a pin (6) for connecting the valve stem (1) and the anti-rotation connector (3); or connecting the valve stem (1) and the valve core (2) to prevent the valve stem (1) from rotating relative to the valve core (2).

6. The connection structure between the valve core and the valve stem according to any one of claims 1-4, characterized in that, It also includes a locking member (5), the anti-rotation connector (3) is provided with a first connecting hole (32), the valve core (2) is provided with a second connecting hole, and the locking member (5) passes through the first connecting hole (32) and the second connecting hole to be adapted to fasten the anti-rotation connector (3) to the valve core (2).

7. The connection structure between the valve core and the valve stem according to claim 6, characterized in that, The limiting hole (31) is located on the axial direction of the anti-rotation connector (3). There are multiple first connecting holes (32). The multiple first connecting holes (32) are arranged in a circumferential array with the axis of the limiting hole (31) as the center. The number of the locking member (5), the first connecting hole (32), and the second connecting hole are the same.

8. The connection structure between the valve core and the valve stem according to claim 6, characterized in that, The locking element (5) is a screw.

9. The connection structure between the valve core and the valve stem according to claim 6, characterized in that, The anti-rotation connector (3) and the inner surface of the connector (21) are fixedly connected by spot welding.

10. The connection structure between the valve core and the valve stem according to claim 1, characterized in that, The outer surface of the connecting seat (21) is provided with a guide boss (211); or the outer surface of the connecting seat (21) is flush with the end face of the valve core (2), and a guide groove is provided along the axial direction from the outer surface of the connecting seat (21).

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