A thrust ball bearing rotary gate valve

Abstract

The utility model belongs to valve technical field, especially push force ball bearing rotary gate valve, including valve body, valve rod, gate and hand wheel, still include: valve rod nut, its cooperation with valve rod through the thread, at least a set of push force ball bearing assembly, the sleeve is installed in the valve rod periphery, and sets up between valve rod nut and valve's fixed part, push force ball bearing assembly includes bearing cover, and the dynamic ring, static ring, rolling body and retainer that contain in bearing cover, bearing cover has the opening of axial, circumference wall part and is used for preventing dynamic ring and static ring to prevent the anti -runout structure that gets out, wherein, dynamic ring is fixedly connected with valve rod nut and rotates with it in unison, and static ring is contacted through bearing cover and valve's fixed part, the utility model discloses through setting the sleeve that is installed in the valve rod periphery between valve rod nut and valve fixed part push force ball bearing assembly, converts the sliding friction between two into the rolling friction, reduces the operating torque, makes the valve opening and closing smooth.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically refers to a thrust ball bearing rotary gate valve. Background Technology

[0002] Rotary gate valves are commonly used control devices in industrial production and fluid transportation. They are mainly used to connect or disconnect liquids, gases and other media in pipelines. With their compact structure and reliable sealing, they are widely used in pipeline systems in many industries such as petroleum, chemical and power.

[0003] In existing rotary gate valves, the valve stem nut and the valve's fixed components are mostly in direct contact through sliding friction. This friction not only results in enormous operating torque but also easily leads to adhesive wear under high-pressure conditions, accelerating the wear of the valve stem nut and packing gland, ultimately affecting the valve's sealing performance and service life. Therefore, there is an urgent need for a rotary gate valve that can reduce friction between the valve stem nut and the fixed components, lower operating torque, and ensure smooth opening and closing. Utility Model Content

[0004] This invention provides a thrust ball bearing assembly fitted around the valve stem between the valve stem nut and the valve fixing component, converting the sliding friction between them into rolling friction, reducing operating torque, and ensuring smooth valve opening and closing, thereby solving the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved as follows: a thrust ball bearing rotary gate valve includes a valve body, a valve stem, a gate plate, and a handwheel, and further includes:

[0006] A valve stem nut, which is threadedly engaged with the valve stem;

[0007] At least one thrust ball bearing assembly is fitted around the valve stem and positioned between the valve stem nut and the valve's fixing components;

[0008] The thrust ball bearing assembly includes a bearing housing, and a moving ring, a stationary ring, rolling elements, and a cage housed within the bearing housing. The bearing housing has an axial opening, a peripheral wall portion, and an anti-disengagement structure for preventing the moving ring and stationary ring from disengaging.

[0009] The moving ring is fixedly connected to the valve stem nut and rotates synchronously with it, while the stationary ring contacts the fixed component of the valve through the bearing housing.

[0010] The present invention is further configured such that the anti-detachment structure includes:

[0011] A limiting constriction is formed at one end of the peripheral wall of the bearing housing to axially limit the moving ring;

[0012] An annular retaining plate is formed at the other end of the peripheral wall of the bearing housing and is used to axially limit the stationary ring.

[0013] The present invention is further configured such that the limiting constriction and the annular locking platform are both annular flanges that surround the peripheral wall portion as a whole.

[0014] The present invention is further configured such that the bearing housing is an integral structure made of synthetic resin.

[0015] The present invention is further configured such that the synthetic resin is poly(adipamide) or poly(adipamide).

[0016] The present invention is further configured such that there are two sets of thrust ball bearing assemblies, which are respectively located at both ends of the valve stem nut in the axial direction.

[0017] The present invention is further configured such that the moving ring and the stationary ring have track surfaces that contact the rolling elements, and the track surfaces are treated with an oil-repellent coating.

[0018] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0019] 1. By using a thrust ball bearing assembly, the sliding friction between the valve stem nut and the valve fixing parts is converted into rolling friction, reducing operating resistance and improving the smoothness of valve opening and closing.

[0020] 2. By utilizing the anti-detachment structure of the bearing housing and the properties of the synthetic resin material, combined with the oleophobic treatment of the moving and stationary rings, component wear is reduced, and the service life of the valve is improved.

[0021] 3. By symmetrically arranging and precisely matching two sets of thrust ball bearing assemblies, axial movement of the valve stem nut is suppressed, ensuring smooth operation and improving the reliability of valve operation. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the rotary gate valve of this utility model;

[0023] Figure 2 This is a utility model Figure 1 A magnified structural diagram of part A;

[0024] Figure 3 This is a three-dimensional structural schematic diagram of the thrust ball bearing assembly of this utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the bearing housing of this utility model.

[0026] The reference numerals in the figure are as follows: 1. Valve body; 2. Valve stem; 3. Gate; 4. Handwheel; 5. Valve stem nut; 6. Thrust ball bearing assembly; 60. Bearing housing; 600. Opening; 601. Peripheral wall; 602. Anti-detachment structure; 6020. Limiting constriction; 6021. Annular clamping platform; 61. Moving ring; 62. Stationary ring; 63. Rolling element; 64. Cage; 7. Track surface. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :

[0028] Example 1:

[0029] This embodiment provides a thrust ball bearing rotary gate valve, including a valve body 1, a valve stem 2, a gate 3, and a handwheel 4, and also includes:

[0030] Valve stem nut 5, which is threadedly engaged with the valve stem 2;

[0031] At least one thrust ball bearing assembly 6 is fitted around the valve stem 2 and positioned between the valve stem nut 5 and the valve's fixing component;

[0032] The thrust ball bearing assembly 6 includes a bearing housing 60, and a moving ring 61, a stationary ring 62, a rolling element 63, and a cage 64 housed within the bearing housing 60. The bearing housing 60 has an axial opening 600, a peripheral wall portion 601, and an anti-disengagement structure 602 for preventing the moving ring 61 and the stationary ring 62 from disengaging.

[0033] The moving ring 61 is fixedly connected to the valve stem nut 5 and rotates synchronously with it, while the stationary ring 62 contacts the fixed component of the valve through the bearing cover 60.

[0034] The valve stem nut 5 is used to convert its own rotational motion into the axial linear motion of the valve stem 2. It is usually a cylindrical or block-shaped structure with internal threads. Through the internal thread and the external thread of the valve stem 2, it receives the rotational force transmitted by the handwheel 4 and drives the valve stem 2 to rise and fall through the threaded engagement, thereby driving the gate 3 to move.

[0035] The thrust ball bearing assembly 6 converts the sliding friction between the valve stem nut 5 and the valve fixing component into rolling friction. Its structure is a combination of bearing housing 60, moving ring 61, stationary ring 62, rolling element 63 and cage 64. It is fitted around the valve stem 2 and sandwiched between the valve stem nut 5 and the valve fixing component. The moving ring 61 can be fixed to the valve stem nut 5 by key connection, and the stationary ring 62 is in contact with the valve fixing component, thereby reducing the resistance when the valve stem nut 5 rotates and ensuring smooth valve opening and closing.

[0036] The bearing housing 60 is used to accommodate and fix the moving ring 61, the stationary ring 62, the rolling element 63, and the cage 64. It is constructed as an annular housing structure with an axial opening 600, a peripheral wall portion 601, and an anti-detachment structure 602. It is positioned around the outside of the moving ring 61 and the stationary ring 62. The anti-detachment structure 602 limits the movement of the moving ring 61 and the stationary ring 62 inside, thereby preventing the internal components from coming out and ensuring the overall stability of the bearing assembly.

[0037] The moving ring 61 is used to rotate synchronously with the valve stem nut 5 and drive the rolling element 63 to move. It has a ring structure and a track surface 7 on its surface that contacts the rolling element 63. Its shape is adapted to the inside of the bearing housing 60 and the rolling element 63. It is located inside the bearing housing 60 on the side close to the valve stem nut 5. It moves synchronously with the valve stem nut 5 through a key connection, thereby transmitting the rotational force of the valve stem nut 5 to the rolling element 63 and realizing the conversion of the friction mode.

[0038] The stationary ring 62 provides a stable rolling track for the rolling element 63. It has a ring structure and a track surface 7 that contacts the rolling element 63. Its shape is adapted to the moving ring 61, the rolling element 63 and the bearing housing 60. It is located inside the bearing housing 60 on the side away from the valve stem nut 5. It contacts the valve fixing component through the bearing housing 60 and remains stationary relative to the bearing housing 60 and the fixing component. It cooperates with the moving ring 61 and the rolling element 63 to achieve rolling friction, bear the axial thrust and transmit it to the fixing component.

[0039] The rolling element 63 rolls between the moving ring 61 and the stationary ring 62, reducing the frictional resistance between them. It is constructed as a spherical or cylindrical rollable structure, and its shape is adapted to the track surface 7 of the moving ring 61 and the stationary ring 62. It is located between the track surface 7 of the moving ring 61 and the stationary ring 62 and is evenly separated by the cage 64. It makes rolling contact with the track surface 7 of the moving ring 61 and the stationary ring 62, and is used to convert the rotational motion of the moving ring 61 into its own rolling motion, so that the sliding friction becomes rolling friction and the overall running resistance is reduced.

[0040] The anti-detachment structure 602 is used to prevent the moving ring 61 and the stationary ring 62 from detaching from the bearing housing 60. It corresponds to the outer axial direction of the moving ring 61 and the stationary ring 62, respectively. Through its own structure, it forms an axial block on the moving ring 61 and the stationary ring 62, thereby constraining the moving ring 61, the stationary ring 62, the rolling element 63 and the cage 64 into a whole, and preventing the components from falling apart and affecting the use.

[0041] The valve's fixing component is an annular structure fixed relative to the valve body 1 or valve cover, used to provide axial support. Specifically, it can be an annular shoulder machined into the inner hole of the valve cover, or it can be an independent pressure ring or pressure nut fixedly installed inside the valve cover.

[0042] During operation, the user rotates handwheel 4, which drives the valve stem nut 5 connected to it to rotate synchronously. Since the valve stem nut 5 is threaded to the valve stem 2, and the valve stem 2 is constrained by the gate 3 and cannot rotate, the rotational motion of the valve stem nut 5 is converted into the axial linear motion of the valve stem 2 through the threaded pair, thereby driving the gate 3 to rise and fall, realizing the opening and closing of the valve. During this process, the rotation of the valve stem nut 5 generates axial thrust, and the thrust ball bearing assembly 6, which is fitted around the valve stem 2, begins to function. In the thrust ball bearing assembly 6, the moving ring 61, which is fixedly connected to the valve stem nut 5, rotates synchronously with it. The rotation of the moving ring 61 is transmitted through the rolling of the rolling elements 63 on the track surface 7 of the stationary ring 62. The stationary ring 62 is kept relatively stationary with the fixed parts of the valve through the bearing housing 60, converting the original sliding friction between the valve stem nut 5 and the fixed parts into rolling friction, effectively reducing rotational resistance, ensuring the smooth rotation of the valve stem nut 5, and thus ensuring the smooth movement of the valve stem 2 and the gate 3.

[0043] The anti-detachment structure 602 includes a limiting constriction 6020 and an annular retaining plate 6021. The limiting constriction 6020 is formed at one end of the peripheral wall portion 601 of the bearing housing 60 and is used to axially limit the moving ring 61. The annular retaining plate 6021 is formed at the other end of the peripheral wall portion 601 of the bearing housing 60 and is used to axially limit the stationary ring 62. The purpose of this design is to achieve reliable axial positioning of the moving ring 61 and the stationary ring 62 by setting specific structures at both ends of the peripheral wall 601 of the bearing housing 60. The limiting constriction 6020 is an annular protrusion formed by the inward contraction of one end of the peripheral wall 601, and the annular retaining platform 6021 is an annular shoulder formed by the inward extension of the other end of the peripheral wall 601. Both are integrally formed with the bearing housing 60. Through their own structures, they form a barrier from the axial outside of the moving ring 61 and the stationary ring 62, respectively, constraining the moving ring 61, the stationary ring 62, the rolling element 63 and the cage 64 within the bearing housing 60. This prevents the components from axially shifting or coming off during valve operation, ensuring the overall integrity and operational stability of the thrust ball bearing assembly 6.

[0044] The bearing housing 60 is a one-piece structure made of synthetic resin, specifically poly(adipamide) or poly(hexamethylene adipamide). The purpose of this design is to utilize these two synthetic resins, poly(adipamide) or poly(hexamethylene adipamide), and combine them with a one-piece structure to create the bearing housing 60. This leverages the inherent good mechanical strength, wear resistance, heat resistance, and chemical resistance of these resins to meet the operational requirements of the valve. Simultaneously, the self-lubricating properties of the resin reduce friction with other components. The one-piece structure can be injection molded in one step, seamlessly integrating the anti-detachment structures 602, such as the limiting neck 6020 and the annular locking platform 6021, with the housing body without additional assembly steps, simplifying the production and assembly process. This ensures both the structural integrity of the housing and the reliability of the limiting of internal components, while also achieving lightweight design. Furthermore, the resin material is rust-resistant and avoids corrosion by the media, thus protecting the internal bearing components and maintaining their stable operation.

[0045] Two sets of thrust ball bearing assemblies 6 are respectively located at both axial ends of the valve stem nut 5. The purpose of this design is to form a symmetrical bidirectional support structure by setting one set of thrust ball bearing assemblies 6 at each axial end of the valve stem nut 5. The moving rings 61 of the two sets of thrust ball bearing assemblies 6 are fixedly connected to both ends of the valve stem nut 5, and each contacts the fixed parts of the valve through the bearing housing 60. This allows them to simultaneously withstand the bidirectional axial force generated during the opening and closing of the valve, effectively suppressing the axial movement of the valve stem nut 5 during rotation, limiting its axial displacement, providing stable support for the valve stem nut 5, ensuring the smoothness of the rotational movement of the valve stem nut 5, distributing the load borne by individual components, reducing component wear, and maintaining the stable operation of the entire transmission system.

[0046] The moving ring 61 and stationary ring 62 have a track surface 7 that contacts the rolling element 63, and the track surface 7 is treated with an oil-repellent coating. The purpose of this design is to treat the track surface 7 of the moving ring 61 and stationary ring 62 that contacts the rolling element 63 with an oil-repellent coating. This treatment is achieved by coating the cleaned track surface 7 with a fluorinated oil-repellent agent and allowing it to cure, forming a thin oil-repellent film. Utilizing the properties of the oil-repellent layer, a limited amount of lubricant is confined to the contact area between the track surface 7 and the rolling element 63, preventing the lubricant from detaching from the contact surface due to centrifugal force and other factors, thus preventing lubrication failure. Simultaneously, it reduces the agitation resistance of the lubricant, reduces frictional loss between the track surface 7 and the rolling element 63, and ensures the stable operation of the thrust ball bearing assembly 6.

[0047] The above design uses a rotating handwheel 4 to drive the valve stem nut 5 to rotate. The valve stem nut 5 drives the valve stem 2 to move axially in a linear motion through a threaded connection, thereby driving the gate 3 to open and close the valve. A thrust ball bearing assembly 6 is installed at each of the axial ends of the valve stem nut 5. The moving ring 61, which is fixedly connected to the valve stem nut 5 in the thrust ball bearing assembly 6, rotates synchronously with it. The moving ring 61 rolls with the stationary ring 62, which is in contact with the valve fixing component through the bearing housing 60, via rolling elements 63 separated by a cage 64, converting the original sliding friction into rolling friction. The bearing housing 60 is an integral structure made of poly(hexamethylene adipamide) or poly(hexamethylene adipamide) synthetic resin, with its peripheral wall 601 at both ends... The limiting constriction 6020 and the annular clamp 6021 respectively limit the axial movement of the moving ring 61 and the stationary ring 62. The track surfaces 7 of the moving ring 61 and the stationary ring 62 are cleaned and then treated with oil-repellent coating, coating or film bonding and curing to ensure that the lubricant remains in the contact area. The two sets of symmetrically arranged bearing assemblies can withstand bidirectional axial forces and suppress the axial movement of the valve stem nut 5. The integrated synthetic resin cover simplifies assembly and ensures the integrity of the structure. The oil-repellent treatment and rolling friction reduce component wear. The anti-detachment structure 602 prevents the components from falling apart. Overall, the valve opening and closing process is smoother, the components run more stably, the service life of the valve is extended, and it is suitable for various working conditions.

[0048] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A thrust ball bearing rotary gate valve, comprising a valve body (1), a valve stem (2), a gate (3), and a handwheel (4), characterized in that, Also includes: Valve stem nut (5), which is threadedly engaged with the valve stem (2); At least one thrust ball bearing assembly (6) is fitted around the valve stem (2) and positioned between the valve stem nut (5) and the valve's fixing component; The thrust ball bearing assembly (6) includes a bearing housing (60), and a moving ring (61), a stationary ring (62), rolling elements (63), and a cage (64) housed within the bearing housing (60). The bearing housing (60) has an axial opening (600), a peripheral wall portion (601), and an anti-disengagement structure (602) for preventing the moving ring (61) and the stationary ring (62) from disengaging. The moving ring (61) is fixedly connected to the valve stem nut (5) and rotates synchronously with it, while the stationary ring (62) contacts the fixed component of the valve through the bearing housing (60).

2. A thrust ball bearing rotary gate valve according to claim 1, characterized in that, The anti-detachment structure (602) includes: A limiting constriction (6020) is formed at one end of the peripheral wall portion (601) of the bearing housing (60) for axially limiting the moving ring (61); An annular retaining plate (6021) is formed at the other end of the peripheral wall portion (601) of the bearing housing (60) and is used to axially limit the stationary ring (62).

3. A thrust ball bearing rotary gate valve according to claim 2, characterized in that, The limiting constriction (6020) and the annular mounting plate (6021) are both annular flanges that surround the peripheral wall portion (601).

4. A thrust ball bearing rotary gate valve according to claim 1, characterized in that, The bearing housing (60) is a one-piece structure made of synthetic resin.

5. A thrust ball bearing rotary gate valve according to claim 4, characterized in that, The synthetic resin is poly(adipamide) or poly(adipamide).

6. A thrust ball bearing rotary gate valve according to claim 1, characterized in that, The number of thrust ball bearing assemblies (6) is two sets, which are respectively located at both ends of the valve stem nut (5) in the axial direction.

7. A thrust ball bearing rotary gate valve according to claim 1, characterized in that, The moving ring (61) and the stationary ring (62) have a track surface (7) that contacts the rolling element (63), and the track surface (7) is treated with oleophobic coating.

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