Valve stem bearing assembly
Patent Information
- Application Number
- CN202522786875.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-29
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-12-29
AI Technical Summary
通常情况下，需要在阀杆与支撑件之间设置轴承来降低摩擦系数，目前行业中使用较多为不锈钢喷涂PTEE的自润滑滑动轴承；这种轴承能够降低阀杆与支撑件接触处的摩擦系数，但这种不锈钢喷涂PTEE的自润滑滑动轴承因轴承表面的PTEE无法承受过大的轴向力且在阀杆开启或关闭阀门的过程中会逐渐磨损，最终会导致阀杆直接与不锈钢表面接触，摩擦系数随着PTEE的磨损会逐渐增大，从而使阀门开关扭矩急剧变大，甚至导致阀门无法正常工作，只能停机维修或更换阀门；如果在非正常检修期间或紧急情况下出现阀门无法动作的情况，将产生重大的经济损失甚至发生重大安全事故
[0012] The beneficial effects of this invention are as follows: By setting an oil storage structure on the inner surface of the sliding bearing, this invention stores sealing grease, ensuring that a layer of lubricating oil film is always maintained on the contact surface between the sliding bearing and the valve stem to reduce the coefficient of friction between them, thereby reducing the frictional torque of the valve. Combined with the wear-resistant layer covering the contact surface between the sliding bearing and the valve stem, the wear of the sliding bearing is significantly reduced. Furthermore, by optimizing the oil storage structure, the dimensions of the oil storage structure correspond to the rotation of the valve stem. During the rotation of the valve stem, a larger amount of grease can be pushed to other parts from the initial rotation position, improving the utilization rate of the grease, making the lubricating oil film formed between the sliding bearing and the valve stem more uniform, and reducing grease loss, thereby extending the service life of the grease.
Smart Images
Figure CN224859903U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve assembly structure technology, and in particular to a valve stem bearing assembly. Background Technology
[0002] In valve manufacturing, the magnitude of the valve switching torque directly determines the selection and size of the actuator or the force required to manually open the valve; and in actual valve applications, the magnitude of the valve switching torque directly determines the valve's manufacturing cost, the time required for valve switching action, and the labor intensity of operating the valve.
[0003] As the pressure-controlling rotating part of a valve, the valve stem rotates 90° or 360° under the drive of the actuator during valve opening and closing. During this rotation, the valve stem only needs to overcome the friction between itself and supporting components such as the valve body support or the support plate. Typically, a bearing is installed between the valve stem and the supporting components to reduce the coefficient of friction. Currently, the industry commonly uses self-lubricating sliding bearings made of stainless steel coated with PTFE. While these bearings reduce the coefficient of friction at the contact point between the valve stem and the supporting components, the PTFE on the bearing surface cannot withstand excessive axial force and gradually wears down during valve opening and closing. Eventually, the valve stem will directly contact the stainless steel surface, and the coefficient of friction will gradually increase with the wear of the PTFE. This leads to a sharp increase in the valve's opening and closing torque, potentially causing the valve to malfunction and requiring shutdown for maintenance or replacement. If the valve fails to operate during abnormal maintenance or in an emergency, it will result in significant economic losses or even a major safety accident. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a valve stem bearing assembly that can effectively reduce the wear of sliding bearings during use and improve the service life of sliding bearings.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a valve stem bearing assembly, including a support member, a valve stem, and a sliding bearing sleeved and installed on the valve stem. The support member is fixed outside the sliding bearing, and the sliding bearing slides with the valve stem. The inner surface of the sliding bearing is provided with a recessed oil storage structure, which includes an opening on the inner surface of the sliding bearing and an oil storage portion inside the sliding bearing. The portion of the inner surface of the sliding bearing without the oil storage structure is covered with a first wear-resistant layer, and the portion of the outer circumference of the valve stem that mates with the sliding bearing is covered with a second wear-resistant layer. The oil storage structure extends along the rotation direction of the valve stem on the inner surface of the sliding bearing, and the size of the oil storage structure gradually decreases from the end closer to the starting point of valve stem rotation to the end farther away from the starting point of valve stem rotation.
[0006] As an improvement to the above solution: the oil storage structure is a strip-shaped oil storage tank, which extends in multiple annular or spiral shapes on the inner surface of the sliding bearing along the rotation direction of the valve stem; the width of the oil storage tank gradually decreases from the end near the starting point of valve stem rotation to the end away from the starting point of valve stem rotation.
[0007] As an improvement to the above solution: the oil storage structure consists of multiple oil storage holes, one end of which is located on the inner surface of the sliding bearing and is an oil outlet, and the other end of which is located inside the sliding bearing is connected in sequence through an oil delivery pipe; the multiple oil storage holes are evenly distributed at intervals on the inner surface of the sliding bearing along the rotation direction of the valve stem; the diameter of the oil storage holes gradually decreases from the point closer to the starting point of valve stem rotation to the point farther away from the starting point of valve stem rotation.
[0008] As an improvement to the above scheme: the sliding bearing consists of at least three arc-shaped units cut along the axial direction, with the edges of adjacent arc-shaped units abutting each other; the oil storage structure is segmented and set on each arc-shaped unit.
[0009] As an improvement to the above solution: the length of the second wear-resistant layer along the valve stem axial direction is greater than the length of the first wear-resistant layer along the sliding bearing axial direction, and the thickness of the second wear-resistant layer is equal to the thickness of the first wear-resistant layer.
[0010] As an improvement to the above scheme: the roughness of the inner surface of the first wear-resistant layer is greater than Ra0.6, and the roughness of the outer surface of the second wear-resistant layer is greater than Ra0.2; the materials of the first wear-resistant layer and the second wear-resistant layer are both wear-resistant alloy materials, the hardness of the first wear-resistant layer is greater than HRC50, and the hardness of the second wear-resistant layer is greater than HRC55.
[0011] As an improvement to the above solution: the opening of the oil storage structure is a flared structure, and the opening of the oil storage structure and the first wear-resistant layer are in a rounded transition.
[0012] The beneficial effects of this invention are as follows: By setting an oil storage structure on the inner surface of the sliding bearing, this invention stores sealing grease, ensuring that a layer of lubricating oil film is always maintained on the contact surface between the sliding bearing and the valve stem to reduce the coefficient of friction between them, thereby reducing the frictional torque of the valve. Combined with the wear-resistant layer covering the contact surface between the sliding bearing and the valve stem, the wear of the sliding bearing is significantly reduced. Furthermore, by optimizing the oil storage structure, the dimensions of the oil storage structure correspond to the rotation of the valve stem. During the rotation of the valve stem, a larger amount of grease can be pushed to other parts from the initial rotation position, improving the utilization rate of the grease, making the lubricating oil film formed between the sliding bearing and the valve stem more uniform, and reducing grease loss, thereby extending the service life of the grease. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of one embodiment of the oil storage structure on the sliding bearing in this utility model; Figure 3 This is a schematic diagram of another embodiment of the oil storage structure on the sliding bearing in this utility model; Figure 4 This is a top view of the sliding bearing in this utility model when it adopts a split structure.
[0014] The diagram is labeled as follows: 100-valve stem, 110-second wear-resistant layer, 200-sliding bearing, 210-first wear-resistant layer, 300-oil reservoir structure. Detailed Implementation
[0015] To facilitate understanding of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.
[0016] In the description of this utility model, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0017] like Figure 1 As shown, the valve stem bearing assembly of the valve disclosed in this utility model consists of a support member, a valve stem 100, and a sliding bearing 200; the sliding bearing 200 is sleeved on the valve stem 100, and the sliding bearing 200 and the valve stem 100 form a sliding fit so that the valve stem 100 can rotate within the sliding bearing 200; the support member is used to fix the sliding bearing 200, and the support member is fixedly connected to the outside of the sliding bearing 200.
[0018] like Figures 1 to 3As shown, in order to reduce the coefficient of friction between the sliding bearing 200 and the valve stem 100 and reduce the frictional torque of the valve, this invention provides an oil storage structure 300 on the inner surface of the sliding bearing 200, i.e., the surface of the sliding bearing 200 that contacts the valve stem 100. The oil storage structure 300 is recessed on the sliding bearing 200, and the depth of the oil storage structure 300 is 0.5-0.8 mm. The oil storage structure 300 includes an opening on the inner surface of the sliding bearing 200 and an oil storage portion recessed inside the sliding bearing 200. The oil storage portion of the oil storage structure 300 stores grease for sealing, and the opening portion of the oil storage structure 300 is used to discharge the grease. This invention stores grease for sealing through the oil storage structure and provides grease to the gap between the contact surfaces of the sliding bearing 200 and the valve stem 100, so that the grease forms a lubricating oil film on the contact surfaces of the sliding bearing 200 and the valve stem 100. In order to improve the utilization rate of lubricating grease, the present invention further optimizes the specific structure of the oil storage structure 300, so that the oil storage structure 300 extends along the rotation direction of the valve stem 100 on the inner surface of the sliding bearing 200, and the size of the oil storage structure 300 gradually decreases from the end closer to the starting point of the rotation of the valve stem 100 toward the end farther away from the starting point of the rotation of the valve stem 100. Through the above-described structural optimization of the oil reservoir 300, the oil output of the oil reservoir 300 is maximized at the end closer to the starting point of valve stem 100 rotation, and minimized at the end farther from the starting point of valve stem 100 rotation. During the initial rotation of valve stem 100, valve stem 100 pushes the grease with the larger output at the starting point, causing the grease to spread along the rotation direction of valve stem 100. As valve stem 100 rotates, the oil output of oil reservoir 300 gradually decreases, while valve stem 100 replenishes the grease at the starting point. This results in a more uniform grease coverage on the contact surface between sliding bearing 200 and valve stem 100, improving lubrication while reducing grease usage. Consequently, the valve's frictional torque is reduced, the oil replenishment cycle is extended, and the valve's operating cost is lowered.
[0019] Furthermore, in order to enable the grease stored in the oil storage structure 300 to flow out of the oil storage structure 300 as quickly as possible, the present invention sets the opening of the oil storage structure 300 as a flared structure, and rounds the corners of the contact area between the opening of the oil storage structure 300 and the contact area of the first wear-resistant layer 210, so that an arc transition is formed between the opening of the oil storage structure 300 and the contact area of the first wear-resistant layer 210.
[0020] Specifically, such as Figure 1As shown, this invention provides a first wear-resistant layer 210 on the sliding bearing 200 and a second wear-resistant layer 110 on the valve stem 100. The first wear-resistant layer 210 covers the portion of the inner surface of the sliding bearing 200 where the oil storage structure 300 is not provided, and the second wear-resistant layer 110 covers the portion of the outer circumference of the valve stem 100 that mates with the sliding bearing 200. Both the first wear-resistant layer 210 and the second wear-resistant layer 110 are made of high-hardness wear-resistant alloy material. The hardness of the first wear-resistant layer 210 is greater than HRC50, and the hardness of the second wear-resistant layer 110 is greater than HRC55. The roughness of the inner surface of the first wear-resistant layer 210 is greater than Ra0.6, and the roughness of the outer surface of the second wear-resistant layer 110 is greater than Ra0.2. This invention, by setting a first wear-resistant layer 210 and a second wear-resistant layer 110, and grinding the contact surfaces of the first wear-resistant layer 210 and the second wear-resistant layer 110 to make the surfaces smooth, forms a wear-resistant hard surface contact between the sliding bearing 200 and the valve stem 100. This ensures that the wear of the sealing surface of the sliding bearing 200 is significantly reduced under long-term use conditions, effectively improving the service life of the sliding bearing 200. To ensure the mating area between the first wear-resistant layer 210 and the second wear-resistant layer 110, the length of the second wear-resistant layer 110 along the axial direction of the valve stem 100 is greater than the length of the first wear-resistant layer 210 along the axial direction of the sliding bearing 200; and the thickness of the second wear-resistant layer 110 is limited to be equal to the thickness of the first wear-resistant layer 210, so that the first wear-resistant layer 210 and the second wear-resistant layer 110 maintain a consistent degree of wear over a long working cycle.
[0021] The oil storage structure 300 used in this utility model has multiple embodiments. In one embodiment, the oil storage structure 300 is a strip-shaped oil storage groove. The oil storage groove extends in multiple annular or spiral segments along the rotation direction of the valve stem 100 on the inner surface of the sliding bearing 200. The multiple annular structure of the oil storage groove is as follows: Figure 3 As shown, the width of the oil reservoir gradually decreases from the end closest to the starting point of the valve stem 100's rotation towards the end furthest from the starting point of the valve stem 100's rotation. In another embodiment of the oil reservoir structure 300, the oil reservoir structure 300 consists of multiple oil reservoir holes. One end of the oil reservoir hole located on the inner surface of the sliding bearing 200 is an oil outlet hole, and the other end of the oil reservoir hole located inside the sliding bearing 200 is connected sequentially through an oil delivery pipe. The multiple oil reservoir holes are evenly distributed at intervals along the rotation direction of the valve stem 100 on the inner surface of the sliding bearing 200. The diameter of the oil reservoir holes gradually decreases from the end closest to the starting point of the valve stem 100's rotation towards the end furthest from the starting point of the valve stem 100's rotation.
[0022] To reduce the machining difficulty of the oil reservoir structure 300 on the sliding bearing 200, such as Figure 4As shown, the sliding bearing 200 can adopt a split structure. Before processing the oil reservoir structure 300, the sliding bearing 200 is first cut into several equal parts by wire cutting, so that the sliding bearing 200 is composed of at least three arc-shaped units cut along the axial direction. After the sliding bearing 200 is cut into equal parts, the oil reservoir structure 300 is processed on the inner surface of the sliding bearing 200 by a laser additive-subtractive composite machine. When assembling the sliding bearing 200, the edges of adjacent arc-shaped units are brought into contact. When the sliding bearing 200 adopts a split structure, the oil reservoir structure 300 is segmented and set on each arc-shaped unit that makes up the sliding bearing 200.
Claims
1. A valve stem bearing assembly, comprising a support member, a valve stem (100), and a sliding bearing (200) sleeved and mounted on the valve stem (100), wherein the support member is fixed outside the sliding bearing (200), and the sliding bearing (200) slides with the valve stem (100), characterized in that: The inner surface of the sliding bearing (200) is provided with a recessed oil storage structure (300). The oil storage structure (300) includes an opening on the inner surface of the sliding bearing (200) and an oil storage portion inside the sliding bearing (200). The portion of the inner surface of the sliding bearing (200) without the oil storage structure (300) is covered with a first wear-resistant layer (210), and the portion of the outer circumference of the valve stem (100) that mates with the sliding bearing (200) is covered with a second wear-resistant layer (110). The oil storage structure (300) extends along the rotation direction of the valve stem (100) on the inner surface of the sliding bearing (200), and the size of the oil storage structure (300) gradually decreases from the end near the starting point of the rotation of the valve stem (100) toward the end away from the starting point of the rotation of the valve stem (100).
2. The valve stem bearing assembly of the valve as described in claim 1, characterized in that: The oil storage structure (300) is a strip-shaped oil storage tank. The oil storage tank extends in multiple annular or spiral shapes on the inner surface of the sliding bearing (200) along the rotation direction of the valve stem (100). The width of the oil storage tank gradually decreases from the end near the starting point of the valve stem (100) to the end away from the starting point of the valve stem (100).
3. The valve stem bearing assembly of the valve as described in claim 1, characterized in that: The oil storage structure (300) consists of multiple oil storage holes. One end of the oil storage hole located on the inner surface of the sliding bearing (200) is the oil outlet. The other end of the oil storage hole located inside the sliding bearing (200) is connected in sequence through an oil supply pipe. Multiple oil storage holes are evenly distributed in sequence on the inner surface of the sliding bearing (200) along the rotation direction of the valve stem (100). The diameter of the oil storage holes gradually decreases from the starting point of rotation near the valve stem (100) toward the starting point of rotation away from the valve stem (100).
4. The valve stem bearing assembly of the valve as described in claim 1, characterized in that: The sliding bearing (200) consists of at least three arc-shaped units cut along the axial direction, with the edges of adjacent arc-shaped units abutting each other; the oil storage structure (300) is segmented and arranged on each arc-shaped unit.
5. The valve stem bearing assembly of the valve as described in claim 1, characterized in that: The length of the second wear-resistant layer (110) along the axial direction of the valve stem (100) is greater than the length of the first wear-resistant layer (210) along the axial direction of the sliding bearing (200), and the thickness of the second wear-resistant layer (110) is equal to the thickness of the first wear-resistant layer (210).
6. The valve stem bearing assembly of the valve as described in claim 5, characterized in that: The roughness of the inner surface of the first wear-resistant layer (210) is greater than Ra0.6, and the roughness of the outer surface of the second wear-resistant layer (110) is greater than Ra0.2; the materials of the first wear-resistant layer (210) and the second wear-resistant layer (110) are both wear-resistant alloy materials, the hardness of the first wear-resistant layer (210) is greater than HRC50, and the hardness of the second wear-resistant layer (110) is greater than HRC55.
7. The valve stem bearing assembly of the valve as described in claim 1, characterized in that: The opening of the oil storage structure (300) is an flared structure, and the opening of the oil storage structure (300) and the first wear-resistant layer (210) are in a rounded transition.