Anti-vibration spool coupling structure

Abstract

The utility model provides a kind of anti-vibration valve core connecting structure, belong to valve anti-vibration technical field.The purpose is to solve the problems of valve core loosening, adjustment failure, valve core falling off in prior art.In the utility model, valve stem is inserted into valve body through valve cover, valve stem is fixed with valve cover by pressing plate, valve cover is fixed in the upper end of valve body by screw, and pressing sleeve, packing, upper bearing, spacer ring and lower bearing are sequentially arranged coaxially from top to bottom between valve stem and valve cover; boss is arranged at the end of valve stem and coaxially connected with valve core, and is fixed radially by self-tightening screw, and self-tightening screw plug is further arranged between valve stem and valve core; support sleeve is installed in the opening of lower end of valve body, valve seat is hollowly installed in support sleeve, and valve seat is coaxial with valve core; valve body bottom is fixedly connected with outlet flange, and flow guide sleeve is coaxial with valve seat and installed in outlet flange.The utility model solves the problems of valve core loosening, adjustment failure, valve core falling off in prior art, and overcomes the deflection force caused by fluid impact.

Description

Technical Field

[0001] This utility model belongs to the field of valve vibration resistance technology, and in particular relates to a vibration-resistant valve core connection structure. Background Technology

[0002] In the structural design of valve equipment, the stability of the connection between the valve stem and the valve core directly determines the valve's adjustment accuracy, operational reliability, and service life, making it a core and critical element in ensuring the normal operation of the fluid control system. In existing technologies, traditional valve stem and valve core connections commonly employ threaded connections or a simple assembly method where the valve core is directly pressed onto the valve stem end using a single screw plug. These connection structures are widely used in low-pressure, low-flow-rate, mild fluid media, and stable operating conditions due to their simple design, low processing difficulty, and low manufacturing cost.

[0003] However, as industrial production moves towards higher pressure and higher parameters, valve equipment is increasingly used in harsh operating conditions with high pressure differentials and strong fluid impacts. The fluid medium flows through the valve channel at extremely high velocities, forming strong impact loads and pulsating pressures. These loads continuously act on the valve core and are transmitted to the valve stem through the connection between the valve core and the valve stem. At the same time, the huge pressure difference formed at both ends of the valve core under high pressure differential conditions further exacerbates the stress complexity of the connection, causing the connection structure to be subjected to periodic alternating loads for a long time.

[0004] The aforementioned harsh operating conditions pose a severe challenge to the stability of traditional connection structures, significantly amplifying the inherent defects of traditional connection methods and frequently causing various failures. On the one hand, for threaded connection structures, continuous alternating loads easily lead to fatigue wear of the threaded pair, resulting in thread loosening. This increases the transmission clearance between the valve stem and valve core, directly affecting the valve's regulation accuracy and causing fluid flow control deviations to exceed allowable ranges, failing to meet the process requirements of industrial production. On the other hand, for connection structures that are only tightened by a screw plug, their connection reliability depends entirely on the preload of the screw plug. Under strong fluid impact, the screw plug is prone to loosening or even falling off, leading to the valve core losing its restraint, resulting in valve core loosening, displacement deviation, and in severe cases, valve core detachment accidents. Valve core detachment not only causes the valve to completely lose its regulating function, paralyzing the fluid control system, but may also cause equipment damage, media leakage, and other safety hazards due to the valve core impacting the valve body or pipeline at high speed under fluid impact, resulting in significant economic losses to industrial production and even threatening the personal safety of on-site operators.

[0005] In summary, there is an urgent need to design an anti-vibration valve core connection structure to solve the problems of valve core loosening, adjustment failure, and valve core detachment in the existing technology. Utility Model Content

[0006] A brief overview of the present invention is given below to provide a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the present invention. It is not intended to identify key or essential parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0007] In view of this, in order to solve the problems of valve core loosening, adjustment failure and valve core falling off in the prior art, this utility model provides an anti-vibration valve core connection structure.

[0008] An anti-vibration valve core connection structure includes a valve stem, pressure plate, pressure sleeve, packing, upper bearing, spacer ring, valve cover, valve body, lower bearing, self-tightening screw, self-tightening plug, valve core, valve seat, support sleeve, outlet flange, and flow guide sleeve. The valve stem passes through the valve cover and is inserted into the valve body. The valve stem is fixed to the valve cover by a pressure plate. The valve cover is fixed to the upper end of the valve body by screws. A pressure sleeve, packing, upper bearing, spacer ring and lower bearing are arranged coaxially between the valve stem and the valve cover from top to bottom. The valve stem end is provided with a boss that is coaxially connected to the valve core and radially fixed by a self-tightening screw. A self-tightening plug is also provided between the valve stem and the valve core. A support sleeve is installed in the lower opening of the valve body, and the valve seat is hollow inside and installed in the support sleeve. The valve seat is coaxial with the valve core. The bottom of the valve body is fixedly connected to the outlet flange, and the flow guide sleeve is installed inside the outlet flange and is coaxial with the valve seat.

[0009] Furthermore, the guide sleeve is provided with a first bushing and a second bushing, which are coaxially arranged inside.

[0010] Furthermore, a second packing gasket is installed between the valve cover and the valve body.

[0011] Furthermore, a first packing pad is installed between the packing and the upper bearing.

[0012] Furthermore, the self-tightening screw is welded and fixed to the valve stem after installation.

[0013] The present invention has the following advantages over the prior art: 1. This utility model adopts a boss alignment positioning structure to achieve precise coaxial positioning of the valve core and valve stem. Combined with the axial pressing effect of the self-tightening screw plug, it forms a dual constraint of "positioning + pressing", which effectively avoids the valve core movement problem caused by positioning deviation and insufficient axial constraint force in traditional connections. 2. This utility model uses a self-tightening screw to fix the valve stem and the self-tightening plug, constructing a dual anti-loosening structure of "plug clamping + screw locking". This not only resists the high-frequency vibration caused by the high pressure difference and prevents the pre-tightening force of the plug from decaying, but also effectively balances the radial bias force generated by fluid impact, avoids radial displacement of the valve core, and ensures that the valve core and valve stem always maintain a stable connection state, thus completely solving the problem of adjustment failure caused by vibration and bias force in traditional connections. 3. The self-tightening screw of this utility model adopts a one-time design. After fixing, it is welded to the valve stem to form an integral structure, which completely prevents the possibility of the screw loosening or falling off. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a structural diagram of an anti-vibration valve core connection structure, with the arrows indicating the direction of fluid movement. Figure 2 This is a schematic diagram of the valve core when closed. Figure 3 A schematic diagram showing the structure when the valve core is open.

[0015] In the diagram: 1-valve stem, 2-pressure plate, 3-pressure sleeve, 4-packing, 5-first packing gasket, 6-upper bearing, 7-spacer ring, 8-second packing gasket, 9-valve cover, 10-valve body, 11-lower bearing, 12-self-tightening screw, 13-self-tightening plug, 14-valve core, 15-valve seat, 16-support sleeve, 17-outlet flange, 18-first bushing, 19-guide sleeve, 20-second bushing. Detailed Implementation

[0016] To make the technical solutions and advantages of the embodiments of this utility model clearer, the exemplary embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0017] Examples, References Figures 1-3 This embodiment describes an anti-vibration valve core connection structure, including a valve stem 1, a pressure plate 2, a pressure sleeve 3, a packing 4, an upper bearing 6, a spacer ring 7, a valve cover 9, a valve body 10, a lower bearing 11, a self-tightening screw 12, a self-tightening plug 13, a valve core 14, a valve seat 15, a support sleeve 16, an outlet flange 17, and a flow guide sleeve 19. The valve stem 1 passes through the valve cover 9 and is inserted into the valve body 10. The valve stem 1 is fixed to the valve cover 9 by the pressure plate 2. The valve cover 9 is fixed to the upper end of the valve body 10 by screws. The valve stem 1 and the valve cover 9 are coaxially arranged from top to bottom with a pressure sleeve 3, a packing 4, an upper bearing 6, a spacer ring 7 and a lower bearing 11. The valve stem 1 has a boss at its end that is coaxially connected to the valve core 14 and radially fixed by a self-tightening screw 12. A self-tightening plug 13 is also provided between the valve stem 1 and the valve core 14. A support sleeve 16 is installed in the lower opening of the valve body 10, and the valve seat 15 is hollow inside and installed in the support sleeve 16. The valve seat 15 is coaxial with the valve core 14. The bottom of the valve body 10 is fixedly connected to the outlet flange 17, and the guide sleeve 19 is installed inside the outlet flange 17 and is coaxial with the valve seat 15.

[0018] Furthermore, the guide sleeve 19 has a first bushing 18 and a second bushing 20 coaxially arranged inside.

[0019] Furthermore, a second packing gasket 8 is installed between the valve cover 9 and the valve body 10.

[0020] Furthermore, a first packing pad 5 is installed between the packing 4 and the upper bearing 6.

[0021] Furthermore, after the self-tightening screw 12 is installed, it is welded and fixed to the valve stem 1.

[0022] This invention utilizes a boss-aligned positioning structure to achieve precise coaxial positioning of the valve core and valve stem. Combined with the axial clamping effect of the self-tightening plug, a dual constraint of "positioning + clamping" is formed, effectively avoiding the valve core movement problem caused by positioning deviation and insufficient axial constraint force in traditional connections. At the same time, the valve stem and self-tightening plug are fixed by a self-tightening screw, constructing a dual anti-loosening structure of "plug clamping + screw locking". This not only resists high-frequency vibration caused by high pressure difference and prevents the preload of the plug from decaying, but also effectively balances the radial bias force generated by fluid impact, preventing radial displacement of the valve core and ensuring that the valve core and valve stem always maintain a stable connection state, completely solving the adjustment failure problem caused by vibration and bias force in traditional connections.

[0023] In this invention, the self-tightening screw is designed for one-time use. After being fixed, it is welded to the valve stem to form an integral structure, completely preventing the possibility of the screw loosening or falling off.

[0024] Although the present invention has been described with reference to a limited number of embodiments, those skilled in the art will understand from the foregoing description that other embodiments are conceivable within the scope of the present invention described herein. Furthermore, it should be noted that the language used in this specification has been chosen primarily for readability and edibility purposes, and not for interpreting or limiting the subject matter of the invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. Regarding the scope of the invention, the disclosure made is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A vibration-resistant valve core connection structure, characterized in that, It includes valve stem (1), pressure plate (2), pressure sleeve (3), packing (4), upper bearing (6), spacer ring (7), valve cover (9), valve body (10), lower bearing (11), self-tightening screw (12), self-tightening plug (13), valve core (14), valve seat (15), support sleeve (16), outlet flange (17) and guide sleeve (19); The valve stem (1) passes through the valve cover (9) and is inserted into the valve body (10). The valve stem (1) is fixed to the valve cover (9) by the pressure plate (2). The valve cover (9) is fixed to the upper end of the valve body (10) by screws. The valve stem (1) and the valve cover (9) are coaxially arranged from top to bottom with a pressure sleeve (3), packing (4), upper bearing (6), spacer ring (7) and lower bearing (11). The valve stem (1) has a boss at the end that is coaxially connected to the valve core (14) and radially fixed by a self-tightening screw (12). A self-tightening plug (13) is also provided between the valve stem (1) and the valve core (14). A support sleeve (16) is installed in the lower opening of the valve body (10), and the valve seat (15) is hollow inside and installed in the support sleeve (16). The valve seat (15) and the valve core (14) are coaxial. The bottom of the valve body (10) is fixedly connected to the outlet flange (17), and the guide sleeve (19) is installed inside the outlet flange (17) and coaxial with the valve seat (15).

2. The anti-vibration valve core connection structure according to claim 1, characterized in that, The guide sleeve (19) has a first bushing (18) and a second bushing (20) coaxially arranged inside.

3. The anti-vibration valve core connection structure according to claim 1, characterized in that, A second packing gasket (8) is installed between the valve cover (9) and the valve body (10).

4. The anti-vibration valve core connection structure according to claim 1, characterized in that, A first packing pad (5) is installed between the packing (4) and the upper bearing (6).

5. The anti-vibration valve core connection structure according to claim 1, characterized in that, After the self-tightening screw (12) is installed, it is welded and fixed to the valve stem (1).

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