Damping lubricated valve stem

Abstract

The utility model discloses a shock absorption lubrication valve stem, it includes valve stem body, and the contraction portion is equipped with in valve stem body middle section, and the contraction portion is equipped with the shock absorption lubrication subassembly that is composed of the upper circular platform and lower circular platform of the upper and lower interval arrangement on the sleeve. The through hole of the interference fit with the contraction portion is set up in the center of upper and lower circular platform, and the first spiral oil storage groove filled with the lubricating grease and the second spiral oil storage groove are respectively screwed on the conical side surface. The big bottom surface of upper and lower circular platform is opposite, and the first arc convex and the second arc convex that are staggered distribution are respectively equipped on it. The utility model discloses through spiral oil storage groove realizes self -lubricating, through arc convex and circular platform combination form multiple shock absorption heat preservation air gap, and through the friction reducing convex point reduces the contact area, and the wear resistance, the impact resistance and the sealing member anti -icing effect of valve stem are comprehensively promoted, especially suitable for the low temperature working condition of limited space.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to a shock-absorbing and lubricating valve stem. Background Technology

[0002] In cryogenic piping systems, valve stems are prone to freezing and jamming due to the low temperature of the medium. To address this issue, an extended valve stem (such as a long-necked bonnet) is often used to create a temperature buffer zone in the valve stem sealing area. However, in situations where installation space is limited, the valve stem length is compressed, resulting in a decrease in its thermal insulation effect.

[0003] Chinese invention patent CN114508626B discloses an insulated valve stem and its usage method, which sets an elastic insulation structure (such as upper and lower frustums) in the constricted part of the valve stem to form an insulation area. However, this structure has the following shortcomings: First, the elastic insulation structure has dry friction with the inner wall of the valve body, which is prone to wear when the valve stem is frequently opened and closed or the system vibrates, affecting its service life; second, this structure mainly focuses on insulation, and its shock absorption capacity is limited for the impact and vibration that the valve stem may be subjected to during movement, which may affect the sealing performance with long-term use.

[0004] Therefore, there is an urgent need for a valve stem structure that can effectively insulate heat within a limited space while also possessing good wear resistance and shock absorption properties. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a shock-absorbing and lubricating valve stem that integrates heat preservation, shock absorption, and self-lubrication.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: A shock-absorbing and lubricating valve stem includes a valve stem body. The middle section of the valve stem body has a contraction portion with a diameter smaller than that at both ends. A shock-absorbing and lubricating assembly is sleeved on the contraction portion. The shock-absorbing and lubricating assembly includes an upper truncated cone and a lower truncated cone arranged at intervals from top to bottom. The center of each of the upper and lower truncated cones has a through hole that is interference-fitted with the contraction portion. The conical side surface of the upper truncated cone has a first spiral oil reservoir spirally formed along its circumference, and the conical side surface of the lower truncated cone has a second spiral oil reservoir spirally formed along its circumference. The first and second spiral oil reservoirs are filled with grease. The large bottom surface of the upper truncated cone and the large bottom surface of the lower truncated cone are arranged opposite each other. The large bottom surface of the upper truncated cone has a plurality of downwardly protruding first arc-shaped protrusions, and the large bottom surface of the lower truncated cone has a plurality of upwardly protruding second arc-shaped protrusions. The first and second arc-shaped protrusions are distributed alternately.

[0007] As an improvement of this utility model, the conical side surface of the upper truncated cone is further provided with a number of upper anti-friction protrusions that contact the inner wall of the valve body, and the conical side surface of the lower truncated cone is further provided with a number of lower anti-friction protrusions that contact the inner wall of the valve body.

[0008] As an improvement of this utility model, the tops of the upper and lower anti-friction protrusions are spherical.

[0009] As an improvement of this utility model, the inner walls of the through holes of the upper and lower truncated cones are recessed inward to form an annular deformation cavity.

[0010] As an improvement of this utility model, an upper adjusting washer is placed between the upper truncated cone and the stepped surface of the valve stem body, and a lower adjusting washer is placed between the lower truncated cone and the stepped surface of the valve stem body.

[0011] The shock-absorbing and lubricating valve stem of this utility model has the following beneficial effects: This invention incorporates a spiral oil reservoir on the side wall of the insulated frustum. When the valve stem is inserted into the valve body, the frustum undergoes elastic deformation under pressure, causing the grease in the spiral reservoir to be continuously and evenly squeezed out to the contact interface between the frustum and the inner wall of the valve body, forming a lubricating film. This fundamentally transforms the original dry friction into boundary lubrication, significantly reducing the coefficient of friction and wear rate. When the valve stem experiences minor vibrations due to temperature or pressure changes, the pumping effect of the spiral reservoir further promotes the redistribution of the grease, achieving long-term self-lubrication and greatly improving the durability of the valve stem under frequent opening and closing conditions.

[0012] This invention constructs a highly efficient multi-level shock-absorbing and heat-insulating layer by setting staggered arc-shaped protrusions on the large base surfaces of the upper and lower frustums. These arc-shaped protrusions replace traditional surface contact with point contact, which not only reduces solid-to-solid heat transfer between the frustums but also forms irregular air gaps between them. These air gaps are excellent thermal insulators, effectively blocking the transmission of low temperature from the lower part of the valve stem to the sealing area. At the same time, when the valve stem is subjected to axial impact, the arc-shaped protrusions and the frustum elastic body work together to absorb the impact energy through their own elastic deformation, providing a good buffering effect and protecting the valve stem and valve seat sealing surfaces.

[0013] This invention comprehensively optimizes the mechanical properties of the component by incorporating anti-friction protrusions, a deformation cavity, and an adjusting washer. The anti-friction protrusions on the top spherical surface further reduce the contact area with the valve body's inner wall, making sliding smoother. The deformation cavity provides a pre-defined deformation area for the frustum, preventing uncontrollable plastic deformation or stress concentration under pressure, ensuring the stability of the self-lubricating function and the long-term reliability of the structure. The adjusting washer facilitates installation and adjustment, ensuring that the shock-absorbing lubrication component is in the optimal working position. These structures work together to enable this invention to maintain stable performance even under complex operating conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the upper truncated cone structure.

[0015] List of identifiers in attached diagrams: 1. Valve stem body; 2. Contraction section; 3. Upper truncated cone; 3a. First spiral oil reservoir; 3b. First arc-shaped protrusion; 3c. Upper anti-friction protrusion; 4. Lower truncated cone; 4b. Second arc-shaped protrusion; 4c. Lower anti-friction protrusion; 5. Deformation cavity; 6. Upper adjusting washer; 7. Lower adjusting washer. Detailed Implementation

[0016] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0017] Furthermore, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] As shown in the figure, the shock-absorbing lubrication valve stem of this embodiment mainly includes a valve stem body 1 and a shock-absorbing lubrication assembly.

[0019] The valve stem body 1 is a metal round rod, with a constricted section 2 formed by machining a section with a smaller diameter in its middle section. A shock-absorbing and lubricating assembly is fitted onto the constricted section 2 and consists of an upper frustum 3, a lower frustum 4, an upper adjusting washer 6, and a lower adjusting washer 7. The upper frustum 3 and lower frustum 4 are integrally molded from a low-temperature resistant, highly elastic rubber material. The upper frustum 3 is interference-fitted onto the upper part of the constricted section 2 through a central through-hole, and its small base rests against the stepped surface of the upper part of the valve stem body 1 via an upper adjusting washer 6. Similarly, the lower frustum 4 is interference-fitted onto the lower part of the constricted section 2 through a central through-hole, and its small base rests against the stepped surface of the lower part of the valve stem body 1 via a lower adjusting washer 7. The large base surfaces of the upper frustum 3 and lower frustum 4 face each other, with a gap between them.

[0020] On the conical side surface of the upper frustum 3, a continuous first spiral oil reservoir 3a is spirally engraved, filled with low-temperature resistant grease. Similarly, on the conical side surface of the lower frustum 4, a second spiral oil reservoir is also spirally engraved and filled with grease. Furthermore, multiple upper anti-friction protrusions 3c and lower anti-friction protrusions 4c with spherical tops are molded on the sides of both the upper and lower frustums 3 and 4. On the large bottom surface of the upper frustum 3, three downwardly protruding first arc-shaped protrusions 3b are molded, evenly distributed circumferentially. On the large bottom surface of the lower frustum 4, three upwardly protruding second arc-shaped protrusions 4b are molded, interspersed with the first arc-shaped protrusions 3b. An annular deformation cavity 5 is also machined into the inner wall of the through hole of the upper frustum 3.

[0021] Specifically, the working principle of this utility model is as follows: After the valve stem is installed into the valve body, the upper truncated cone 3 and the lower truncated cone 4 undergo elastic deformation due to the radial constraint of the inner wall of the valve body. This deformation squeezes the first and second spiral oil reservoirs, causing the grease inside to be squeezed out and coated between the side of the truncated cone and the inner wall of the valve body, forming a lubricating layer.

[0022] During operation, the low temperature from the pipeline medium is mainly conducted through the valve stem body 1. Since the upper and lower truncated cones (3, 4) are poor conductors of heat, and the air insulation layer formed by the first and second arc-shaped protrusions (3b, 4b) effectively blocks the transfer of cold energy to the sealing area 200. When pressure fluctuations occur in the system or the valve stem experiences rapid axial impact, the impact force is first transmitted through the arc-shaped protrusion of the lower truncated cone 4, where its elastic deformation absorbs some of the energy. The remaining energy is further buffered by the air gap and the upper truncated cone 3, greatly reducing the impact force transmitted to the upper part of the valve stem. During valve stem movement, the anti-friction protrusions (3c, 4c) achieve low-friction sliding with the inner wall of the valve body 100 under the action of grease. The deformation cavity 5 ensures that the truncated cones can undergo sufficient and controllable deformation, guaranteeing effective grease supply and buffering effect.

[0023] The accompanying drawings merely illustrate the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, various improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. A shock-absorbing lubricated valve stem comprising a valve stem body (1), the middle section of which is provided with a constriction (2) having a smaller diameter than the two ends, characterized in that: The contraction part (2) is fitted with a shock-absorbing and lubricating assembly. The shock-absorbing and lubricating assembly includes an upper truncated cone (3) and a lower truncated cone (4) arranged at intervals from top to bottom. The center of the upper truncated cone (3) and the lower truncated cone (4) is provided with a through hole that is interference fit with the contraction part (2). The conical side of the upper truncated cone (3) is spirally provided with a first spiral oil storage groove (3a) along its circumference. The conical side of the lower truncated cone (4) is spirally provided with a second spiral oil storage groove along its circumference. The first spiral oil storage groove (3a) and the second spiral oil storage groove are filled with grease. The large bottom surface of the upper truncated cone (3) and the large bottom surface of the lower truncated cone (4) are arranged opposite to each other. The large bottom surface of the upper truncated cone (3) is provided with a number of downward protruding first arc-shaped protrusions (3b). The large bottom surface of the lower truncated cone (4) is provided with a number of upward protruding second arc-shaped protrusions (4b). The first arc-shaped protrusions (3b) and the second arc-shaped protrusions (4b) are staggered.

2. The shock-absorbing and lubricating valve stem according to claim 1, characterized in that: The upper truncated cone (3) is provided with several upper anti-friction protrusions (3c) that contact the inner wall of the valve body, and the lower truncated cone (4) is provided with several lower anti-friction protrusions (4c) that contact the inner wall of the valve body.

3. The shock-absorbing and lubricating valve stem according to claim 2, characterized in that: The tops of the upper anti-friction protrusion (3c) and the lower anti-friction protrusion (4c) are spherical.

4. The shock-absorbing lubrication valve stem according to claim 1, characterized in that: The inner walls of the through holes of the upper truncated cone (3) and the lower truncated cone (4) are recessed inward to form an annular deformation cavity (5).

5. The shock-absorbing lubrication valve stem according to claim 1, characterized in that: An upper adjusting washer (6) is placed between the upper truncated cone (3) and the stepped surface of the valve stem body (1), and a lower adjusting washer (7) is placed between the lower truncated cone (4) and the stepped surface of the valve stem body (1).

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