A high-sealing high-frequency ball valve

Abstract

This utility model belongs to the field of valve technology, and particularly relates to a high-sealing high-frequency ball valve, comprising: a valve body, in which a flow channel and a valve core cavity communicating with the flow channel are provided; a valve seat, which is disposed at the connection between the valve core cavity and the flow channel; a ball valve core, which is disposed in the valve core cavity and opens and closes the flow channel by cooperating with the valve seat; a valve stem, which is disposed on the valve body for controlling the rotation of the ball valve core; and further comprising: a self-aligning bearing unit, which is disposed in the valve body and sleeved on the outside of the valve stem; wherein, the self-aligning bearing unit can evenly distribute the radial load and eliminate eccentric force when the valve stem is tilted. Compared with the prior art, this utility model, through the setting of the self-aligning bearing unit, can evenly distribute the radial load and eliminate eccentric force when the valve stem is tilted, avoiding the wear problem of traditional bushing bearings caused by eccentric load and valve stem tilt, reducing the bearing replacement frequency, and thus extending the service life of the high-frequency ball valve.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a high-sealing high-frequency ball valve. Background Technology

[0002] A ball valve is a type of valve in which the opening and closing element (ball) is driven by a valve stem and rotates around the valve axis. It can also be used for fluid regulation and control. For example, a high-sealing, high-frequency ball valve disclosed in patent application number CN202020567030.1 includes a valve body formed by a left valve body and a right valve body fixedly connected together. A ball core is installed in the cavity of the valve body, and a valve stem is circumferentially fixed to the ball core. Valve seats are respectively provided in the cavities of the left and right valve bodies. Spring seats are respectively fitted on opposite ends of the two valve seats. A storage spring is provided between the spring seats and the valve seats. A first sealing ring is provided between the outer circle of the spring seat and the valve body, and the inner circle of the spring seat... A second sealing ring is provided between the valve seat and the valve body, and a third sealing ring is provided between the outer circle of the valve seat and the valve body. The upper and lower shafts of the ball core are respectively inserted into the shaft holes of the upper and lower positioning plates. The upper and lower positioning plates abut against and limit the left and right valve bodies. A dustproof sealing ring and a wear-resistant sleeve are provided between the large diameter section of the valve stem and the right valve body from bottom to top. A valve cover is fixedly connected to the upper end of the right valve body and presses down the wear-resistant sleeve. A fourth sealing ring is provided between the valve cover and the right valve body. Packing is provided between the small diameter section of the upper end of the valve stem and the valve cover. A packing gland is provided at the upper end of the packing. In the operation of this existing high-frequency ball valve, the traditional bushing bearing used in the valve stem is prone to wear due to eccentric load. There is also the problem of valve stem tilt causing fluctuations in operating torque. Furthermore, high-frequency operation requires frequent bearing replacements, which ultimately reduces the service life of the high-frequency ball valve. Therefore, it is necessary to make improvements. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a high-sealing high-frequency ball valve, thereby effectively improving the service life of the high-sealing high-frequency ball valve.

[0004] In view of this, the present invention provides a high-sealing high-frequency ball valve, comprising: The valve body has a flow channel and a valve core cavity communicating with the flow channel. Valve seat, wherein the valve seat is disposed at the connection between the valve core cavity and the flow channel; A ball valve core is disposed in a valve core cavity, and the ball valve core opens and closes the flow channel by cooperating with a valve seat; A valve stem, which is mounted on the valve body and is used to control the rotation of the ball valve core; Also includes: The self-aligning bearing unit is disposed in the valve body and sleeved on the outside of the valve stem; The self-aligning bearing unit can evenly distribute the radial load and eliminate eccentric force when the valve stem is tilted.

[0005] In this technical solution, the self-aligning bearing unit can evenly distribute the radial load and eliminate eccentric force when the valve stem is tilted. This avoids the wear problems caused by eccentric load and valve stem tilt in traditional bushing bearings, reduces the frequency of bearing replacement, and thus extends the service life of the high-frequency ball valve.

[0006] In the above technical solution, the self-aligning bearing unit further includes: A self-aligning radial bearing is sleeved on the outside of the valve stem; A bearing retainer is provided on the upper side of a self-aligning radial bearing to fix the position of the self-aligning radial bearing. The packing section is disposed between the valve body and the outer wall of the valve stem.

[0007] In the above technical solution, the packing portion further includes: The packing body is composed of several V-shaped sealing rings stacked in multiple layers. A packing retainer is disposed above the packing body; A packing clamp is positioned above the packing retainer to fix the packing retainer and the packing body, while also supporting the self-aligning radial bearing.

[0008] Furthermore, the above technical solution also includes: An annular groove is provided on the outer circumferential surface of the valve seat and is concentrically distributed with the valve seat. A sealing seat is disposed in an annular groove, and a preload spring is arranged between the sealing seat and the annular groove; The outer peripheral surface and side surface of the sealing seat cooperate with the inner wall of the flow channel to form a sealing surface, and the pre-tightening spring is used to press the sealing seat tightly against the inner wall of the flow channel.

[0009] Furthermore, the above technical solution also includes: The first sealing ring is disposed on the outer circumferential surface of the sealing seat, and the first sealing ring has an annular deformation cavity concentrically distributed with the first sealing ring.

[0010] Furthermore, the above technical solution also includes: The second sealing ring is disposed on the side of the sealing seat, and V-shaped grooves are formed on both the inner and outer circumferential surfaces of the second sealing ring.

[0011] The beneficial effects of this utility model are: 1. The self-aligning bearing unit can evenly distribute the radial load and eliminate eccentric force when the valve stem is tilted. This avoids the wear problems caused by eccentric load and valve stem tilt in traditional bushing bearings, reduces the frequency of bearing replacement, and thus extends the service life of high-frequency ball valves.

[0012] 2. The self-aligning bearing unit effectively solves the problem of operating torque fluctuation caused by valve stem tilt, enabling the ball valve to maintain stable torque output during high-frequency operation and ensuring stable operation of the ball valve.

[0013] 3. Through the multi-layer superposition of V-shaped sealing rings in the packing section, the annular deformation cavity of the first sealing ring, and the V-shaped groove of the second sealing ring, the sealing performance of the ball valve is enhanced in multiple ways, which can effectively prevent fluid leakage and meet the stringent sealing requirements under high-frequency operation.

[0014] 4. The connection and fit between the components are reasonable. The setting of components such as bearing retainer, packing retainer, and preload spring ensures the stability and reliability of the overall structure, ensuring that the ball valve can maintain good performance during long-term high-frequency use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0017] Figure 2 This is a schematic cross-sectional view of the present invention.

[0018] Figure 3 This utility model Figure 2 A partial enlarged view of the structure of section A in the middle.

[0019] Figure 4 This utility model Figure 2 A partial enlarged view of the structure of section B.

[0020] Figure 5 This utility model Figure 2 A partial enlarged view of the structure of section C.

[0021] The markings in the diagram are as follows: 1. Valve body; 100. Flow channel; 101. Valve core cavity; 2. Valve seat; 3. Ball valve core; 4. Valve stem; 5. Self-aligning bearing unit; 50. Self-aligning radial bearing; 51. Bearing retainer; 52. Packing section; 520. Packing body; 521. Packing retainer; 522. Packing clamp; 6. Annular groove; 7. Sealing seat; 70. Preload spring; 8. First sealing ring; 80. Annular deformation cavity; 9. Second sealing ring; 90. V-shaped annular groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings. Valve body 1 The valve body 1 is cast from high-strength metal material, possessing excellent pressure resistance and wear resistance. The flow channel 100 within the valve body 1 is cylindrical, smoothly transitioning to the valve core cavity 101 to reduce fluid flow resistance. The connecting parts on both sides of the valve body 1 are connecting flanges with evenly distributed bolt holes for connection to flanges of other pipelines. Gaskets are used to further enhance the sealing performance during connection. The cavity within the valve body 1 corresponding to the self-aligning bearing unit 5 is cylindrical, and its inner wall is precision-machined to ensure good fit accuracy with the outer ring of the self-aligning bearing unit 5. Valve seat 2 The valve seat 2 is made of wear-resistant ceramic material, which has good sealing performance and service life. The valve seat 2 is installed in the groove of the valve body 1 at the connection between the valve core cavity 101 and the flow channel 100 by interference fit, ensuring that the valve seat 2 will not be displaced during operation. The inner surface of the valve seat 2 fits with the outer surface of the ball valve core 3 to form a sealing pair, and the opening and closing of the flow channel 100 is realized by the rotation of the ball valve core 3. Ball valve core 3 The ball valve core 3 is forged from stainless steel and precision machined and polished, resulting in a high degree of surface finish to ensure good sealing performance with the valve seat 2. A through hole of the same diameter as the flow channel 100 is located at the center of the ball valve core 3. When the through hole is aligned with the flow channel 100, the flow channel 100 is open; when the ball valve core 3 is rotated 90 degrees and the through hole is perpendicular to the flow channel 100, the flow channel 100 is closed. Preferably, the ball valve core can be made of polyphenylene oxide (PPE), or at least its outer surface can be made of PPE. Valve stem 4 The valve stem 4 is made of high-strength alloy steel, possessing excellent mechanical strength and toughness. The bottom end of the valve stem 4 is connected to the top end of the ball valve core 3 via a key connection. A transition fit is used between the key and the keyway to ensure circumferential fixation between the valve stem 4 and the ball valve core 3, enabling the valve stem 4 to reliably drive the ball valve core 3 to rotate. The outer wall of the valve stem 4 has an annular step, the size of which matches the inner ring of the self-aligning radial bearing 50. The inner ring of the self-aligning radial bearing 50 is mounted on the step with an interference fit, ensuring a fixed connection between the two. At the bottom of the valve body 1, a supporting valve stem 4 is also arranged. The top end of this valve stem 4 is connected to the bottom end of the ball valve core 3 via a bearing, allowing free rotation and providing stable support for the ball valve core 3, reducing wobbling during rotation. Self-aligning bearing unit 5 Self-aligning radial bearing 50: The outer ring, rollers, and inner ring of the self-aligning radial bearing 50 are all made of bearing steel and undergo heat treatment to improve their hardness and wear resistance. The radius of curvature of the spherical inner surface of the outer ring is precisely calculated to match the rolling trajectory of the rollers. The rollers are arranged obliquely symmetrically, with adjacent rollers tilting in opposite directions. This arrangement allows the self-aligning radial bearing 50 to withstand radial loads from all directions and eliminates eccentric forces through roller adjustment when the valve stem 4 tilts slightly. The inner ring has an interference fit with the step on the valve stem 4, while the outer ring has a clearance fit with the cavity of the valve body 1, allowing the outer ring to swing within a certain range to accommodate the tilt of the valve stem 4. Bearing retainer 51: The bearing retainer 51 is an annular structure made of metal. Its inner diameter is slightly larger than the outer diameter of the valve stem 4, and its outer diameter matches the inner diameter of the valve body 1 cavity. The bearing retainer 51 is connected to the valve body 1 by bolts. The bolts are evenly distributed on the circumference of the bearing retainer 51. By tightening the bolts, the bearing retainer 51 is pressed against the upper side of the self-aligning radial bearing 50, thereby fixing the position of the self-aligning radial bearing 50 in the vertical direction. Packing section 52: The packing body 520 consists of 3-6 V-shaped sealing rings stacked in multiple layers. The V-shaped sealing rings are made of flexible graphite material, providing excellent sealing performance and high-temperature resistance. The openings of the V-shaped sealing rings face the direction of fluid pressure. When fluid pressure acts on the V-shaped sealing rings, the sides of the V-shaped sealing rings open, further conforming to the surfaces of the valve body 1 and valve stem 4, enhancing the sealing effect. The packing retainer 521 is a metal ring structure. Its inner diameter matches the outer diameter of the valve stem 4, and its outer diameter matches the inner diameter of the valve body 1 cavity. It is placed above the packing body 520, providing support for the packing body 520. The packing clamp 522 is also a ring structure, made of metal material, and connected to the valve body 1 by bolts. The bolts are evenly distributed on the circumference of the packing clamp 522. By tightening the bolts, the packing clamp 522 transmits pressure to the packing retainer 521 and the packing body 520, compressing the packing body 520 and tightly fitting it between the valve body 1 and the valve stem 4. At the same time, it applies a certain upward supporting force to the self-aligning radial bearing 50 to ensure the stable operation of the self-aligning radial bearing 50. 6-ring groove The annular groove 6 is formed on the outer circumferential surface of the valve seat 2, concentric with the valve seat 2. The cross-sectional shape of the annular groove 6 is rectangular, and its width and depth are determined according to the dimensions of the sealing seat 7 and the preload spring 70, ensuring that the sealing seat 7 and the preload spring 70 can be installed smoothly and function properly. Sealing seat 7 The sealing seat 7 is made of polytetrafluoroethylene (PTFE), which has good sealing performance and corrosion resistance. The outer peripheral surface and side surface of the sealing seat 7 are precision machined to form a tight fit with the inner wall of the flow channel 100, constituting a sealing surface. The sealing seat 7 is installed in the annular groove 6 and can move slightly axially within the annular groove 6. Preload spring 70 The preload spring 70 is made of stainless steel wire, which has good elasticity and corrosion resistance. The preload spring 70 is installed between the sealing seat 7 and the annular groove 6 and is in a compressed state, providing a continuous preload force to the sealing seat 7, pressing the sealing seat 7 tightly against the inner wall of the flow channel 100, and ensuring tight contact between the sealing seat 7 and the inner wall of the flow channel 100. First sealing ring 8 The first sealing ring 8 is made of nitrile rubber, which has good elasticity and sealing performance. The first sealing ring 8 is fixed to the outer circumferential surface of the sealing seat 7 by vulcanization. The cross-sectional shape of its annular deformation cavity 80 is semi-circular. When the first sealing ring 8 is compressed, the deformation cavity will expand, so that the outer circumferential surface of the first sealing ring 8 better fits the inner wall of the flow channel 100, thereby improving the sealing effect. Second sealing ring 9 The second sealing ring 9 is made of fluororubber, which is resistant to high temperatures and chemical corrosion. The second sealing ring 9 is installed in the side groove of the sealing seat 7. The V-shaped groove 90 on its inner and outer circumferences has an angle of 60 degrees and a depth of 1 / 3 of the sealing ring thickness. When leakage pressure acts on the second sealing ring 9, the V-shaped groove 90 is compressed, causing the second sealing ring 9 to expand and deform to both sides, tightly fitting the side of the sealing seat 7 and the inner wall of the flow channel 100. The greater the leakage pressure, the more obvious the expansion and deformation, and the tighter the sealing effect.

[0024] Working principle Opening and closing control principle: When it is necessary to open or close the flow channel 100, the valve stem 4 is rotated by an external drive device (such as a handle, motor, etc.), and the valve stem 4 drives the ball valve core 3 to rotate synchronously through a key connection. When the through hole of the ball valve core 3 is aligned with the flow channel 100, the flow channel 100 is open, and the fluid can pass through smoothly; when the ball valve core 3 rotates 90 degrees and the through hole is perpendicular to the flow channel 100, the outer surface of the ball valve core 3 is tightly fitted with the inner surface of the valve seat 2, the flow channel 100 is closed, and the fluid is prevented from passing through. Working principle of the self-aligning bearing unit 5: During the rotation of the valve stem 4, due to machining errors, installation deviations, or vibrations caused by high-frequency operation, the valve stem 4 may tilt slightly. The outer ring of the self-aligning radial bearing 50 has a spherical inner surface, and the rollers are arranged obliquely symmetrically. When the valve stem 4 tilts, the rollers can roll on the spherical inner surface to adjust their position and angle, thereby eliminating the eccentric force generated by the tilt of the valve stem 4. At the same time, the self-aligning radial bearing 50 can evenly distribute the radial load on the valve stem 4 to the outer ring and the valve body 1, avoiding the wear problem caused by excessive local stress in traditional bushing bearings. The bearing retainer 51 fixes the self-aligning radial bearing 50 in the cavity of the valve body 1 to prevent it from shifting up and down during operation, ensuring the stable operation of the self-aligning function. Sealing principle Packing section 52 sealing: The V-shaped sealing rings in the packing section 52 are stacked in multiple layers and tightly fitted between the valve body 1 and the valve stem 4 under the pressure of the packing clamp 522. When fluid attempts to leak from the gap between the valve body 1 and the valve stem 4, the V-shaped sealing rings will further open under the fluid pressure, enhancing the sealing effect and preventing fluid leakage.

[0025] Sealing seat 7 and sealing ring sealing: The pre-tightening spring 70 presses the sealing seat 7 tightly against the inner wall of the flow channel 100, forming a preliminary seal between the outer circumferential surface and side surface of the sealing seat 7 and the inner wall of the flow channel 100. Under the action of pre-tightening force and fluid pressure, the annular deformation cavity 80 of the first sealing ring 8 deforms, further filling the gap between the outer circumferential surface of the sealing seat 7 and the inner wall of the flow channel 100, enhancing the sealing performance. When a small amount of fluid leaks to the side of the sealing seat 7, the leakage pressure acts on the second sealing ring 9, causing the V-shaped annular groove 90 of the second sealing ring 9 to be squeezed, resulting in the expansion and deformation of the second sealing ring 9, tightly fitting the side surface of the sealing seat 7 and the inner wall of the flow channel 100, forming a tighter seal. Moreover, the greater the leakage pressure, the better the sealing effect. The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A high-sealing high-frequency ball valve, comprising: Valve body (1), wherein a flow channel (100) and a valve core cavity (101) communicating with the flow channel (100) are provided inside the valve body (1); Valve seat (2), wherein the valve seat (2) is disposed at the connection between the valve core cavity (101) and the flow channel (100); A ball valve core (3) is disposed in a valve core cavity (101). The ball valve core (3) opens and closes the flow channel (100) by cooperating with the valve seat (2). Valve stem (4), which is mounted on valve body (1) for controlling the rotation of ball valve core (3); Its characteristic is that it further includes: The self-aligning bearing unit (5) is disposed in the valve body (1) and sleeved on the outside of the valve stem (4); The self-aligning bearing unit (5) can evenly distribute the radial load and eliminate eccentric force when the valve stem (4) is tilted.

2. The high-sealing high-frequency ball valve according to claim 1, characterized in that, The self-aligning bearing unit (5) also includes: A self-aligning radial bearing (50) is sleeved on the outside of the valve stem (4); A bearing retainer (51) is provided on the upper side of the self-aligning radial bearing (50) for fixing the position of the self-aligning radial bearing (50); The packing part (52) is disposed between the valve body (1) and the outer wall of the valve stem (4).

3. The high-sealing high-frequency ball valve according to claim 2, characterized in that, The packing section (52) further includes: The packing body (520) is composed of several V-shaped sealing rings stacked in multiple layers; A packing retainer (521) is disposed above the packing body (520); A packing clamp (522) is provided above the packing retainer (521) to fix the packing retainer (521) and the packing body (520), and to support the self-aligning radial bearing (50).

4. The high-sealing high-frequency ball valve according to claim 1, characterized in that, Also includes: An annular groove (6) is provided on the outer circumferential surface of the valve seat (2) and is concentrically distributed with respect to the valve seat (2); A sealing seat (7) is provided in an annular groove (6), and a preload spring (70) is arranged between the sealing seat (7) and the annular groove (6); The outer peripheral surface and side surface of the sealing seat (7) cooperate with the inner wall of the flow channel (100) to form a sealing surface, and the pre-tightening spring (70) is used to press the sealing seat (7) against the inner wall of the flow channel (100).

5. A high-sealing high-frequency ball valve according to claim 4, characterized in that, Also includes: The first sealing ring (8) is disposed on the outer circumferential surface of the sealing seat (7), and the first sealing ring (8) has an annular deformation cavity (80) concentrically distributed with the first sealing ring (8).

6. A high-sealing high-frequency ball valve according to claim 4, characterized in that, Also includes: The second sealing ring (9) is disposed on the side of the sealing seat (7), and V-shaped annular grooves (90) are provided on both the inner and outer circumferential surfaces of the second sealing ring (9).

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