High-pressure ball valve sealing structure

Abstract

The utility model discloses a high pressure ball valve sealing structure relates to ball valve technical field, the utility model discloses a spherical shell main part, the valve element, the fixed pipe, the pivot and the mounting disc, the inner bottom central fixed limit post of spherical shell main part, the top central of spherical shell main part is equipped with the fixed mouth, and the valve element is movably connected in the spherical shell main part, and the bottom central of valve element is equipped with the movable mouth, and the fixed mouth in sealing ring no. The fixed pipe is fixed in the movable connection of fixed pipe in the pivot, and the fixed pipe inner wall on the top of pivot is fixed with the mounting ring, and the top of mounting ring is fixed with the mounting disc, and the bottom of mounting disc is fixed with sealing ring no. 3. The utility model discloses a spherical shell main part, the valve element, the fixed pipe, the pivot and the mounting disc are set up, and the overall component of high pressure ball valve sealing structure is complicated, and the key dynamic sealing point is easy to wear and tear and leak, and maintenance is difficult to replace, and the valve element is sealed and is easy to be subjected to the deflection effect of high pressure fluid, causes the problem that the valve element is unevenly stressed and produces abrasion.

Description

Technical Field

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

[0002] The sealing structure of a high-pressure ball valve is a precision system designed to ensure reliability under extreme operating conditions. Its core lies in its fixed ball structure to maintain stability, and it primarily relies on a bidirectional metal hard-seal valve seat (dual piston effect, DPE). This system utilizes the medium pressure to push the valve seat against the ball, forming a pressure-reinforced seal, where the sealing force increases with increasing pressure. The sealing of a high-pressure ball valve is not the function of a single component, but rather a complete system integrating fixed ball support, pressure-assisted sealing, multiple static and dynamic seals, and multiple safety functions. However, the sealing structure of high-pressure ball valves still has the following drawbacks in practical use: High-pressure ball valves typically employ a multi-channel, nested stuffing box structure or a one-time encapsulation design for their sealing structure. When critical dynamic seals (such as O-rings and V-packing) located between the valve core and the rotating shaft age and wear due to long-term friction and high-pressure fluid erosion, media leakage can occur. Replacing these internal seals often requires completely removing the valve from the pipeline and disassembling it extensively (such as disassembling the actuator, gland, stuffing box assembly, etc.), and may even require removing the valve core. This process is cumbersome, time-consuming, and labor-intensive, increasing maintenance costs and downtime, especially in high-pressure or critical pipelines. Secondly, under the action of high-pressure fluid or frequent operation, the valve core of the high-pressure ball valve may experience slight radial displacement or deflection within the valve cavity. The instability of the valve core will directly act on the rotating shaft and connector that drive its rotation, causing them to bear additional radial force or bending moment. Under long-term action, this may lead to bending deformation, wear, or even breakage of the connector, resulting in valve jamming, increased operating torque, and exacerbation of uneven wear and leakage at the valve stem seal. Utility Model Content

[0003] The purpose of this utility model is to provide a high-pressure ball valve sealing structure. By setting up a ball shell body, valve core, fixed pipe, rotating shaft and mounting plate, it solves the problems of complex overall components of high-pressure ball valve sealing structure, easy wear and leakage of key dynamic sealing points, difficulty in maintenance and replacement, and easy deflection of valve core after sealing by high pressure fluid, resulting in uneven force on valve core and wear.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a high-pressure ball valve sealing structure, comprising a ball shell body, a valve core, a fixed tube, a rotating shaft, and a mounting plate. A limit post is fixed at the center of the inner bottom of the ball shell body. A fixed opening is formed at the center of the top of the ball shell body. A sealing ring is fixed at the lower part of the fixed opening. The valve core is movably connected inside the ball shell body. A movable opening is formed at the center of the bottom of the valve core. The limit post is movably connected within the movable opening. A fixed tube is fixed within the fixed opening at the top of the sealing ring. A rotating shaft is movably connected within the fixed tube. The bottom end of the rotating shaft abuts against the top end of the sealing ring. A mounting ring is fixed on the inner wall of the fixed tube at the top of the rotating shaft. The top of the mounting ring is fixed with a mounting plate, and the bottom of the mounting plate is fixed with a sealing ring three. The sealing ring three passes through the mounting plate and abuts against the top of the rotating shaft. The ball shell body is the main outer shell of the valve. It has a limiting post inside, which cooperates with the movable port at the bottom of the valve core to limit the radial movement and deflection of the valve core. The top of the ball shell has a fixing port, and a sealing ring one is built in it to initially seal the gap between the valve core and the rotating shaft. The fixing tube is installed in the fixing port, and the rotating shaft is placed in the fixing tube with its bottom end tightly against the sealing ring one. The mounting ring is fixed to the inner wall of the fixing tube. The mounting plate is fixed to the mounting ring by bolts. The sealing ring three at its bottom further presses against the top of the rotating shaft to achieve double sealing.

[0005] Furthermore, symmetrical connecting pipes with central axes aligned on the outer side of the spherical shell body are fixedly connected to the outer side of the connecting pipes. Flanges are fixed to the peripheral edges of the connecting pipes away from the spherical shell body. A second sealing ring is fixed to the inner wall of the connecting pipe near the edge of the spherical shell body, and the second sealing ring abuts against the surface of the valve core. Connecting pipes are symmetrically arranged on both sides of the spherical shell, connected to external pipelines via flanges. The second sealing ring on the connecting pipe near the valve core fits tightly against the outer surface of the valve core, preventing fluid leakage when the valve core is closed.

[0006] Furthermore, the valve core has a through-hole extending along the straight line connecting the central axes of the two connecting pipes on the outer side of the spherical shell body. A socket is located at the center of the top of the valve core. The valve core has a through-hole, allowing for adjustment of its alignment with the connecting pipes on both sides, thus enabling flow path opening and closing and flow control. A socket is located at the top of the valve core for engaging with a connecting strip below the rotating shaft for transmission.

[0007] Furthermore, a connector strip is provided inside the rotating shaft along the central axis. The bottom end of the connector strip is inserted into the socket. The connector strip is provided inside the rotating shaft, and its bottom end is inserted into the socket of the valve core. This allows the rotational torque of the rotating shaft to be directly transmitted to the valve core, thereby driving the valve core to rotate.

[0008] Furthermore, the mounting plate has a through-hole vertically extending along the central axis. The mounting plate on the outer side of the sealing ring three has a ring array of vertically inserted mounting bolts. The mounting bolts are threaded into the mounting ring. The mounting plate has a through-hole in the center for the insertion strip to pass through. Mounting bolts are provided around the perimeter. The bolts are screwed into the mounting ring inside the fixing tube, pressing the mounting plate against the sealing ring three and fixing it to the upper end of the fixing tube.

[0009] Furthermore, the connector strip passes through the sealing ring three and the through-hole in the mounting plate from bottom to top and extends out of the top of the mounting plate. A mounting screw hole is provided in the center of the top of the connector strip. The connector strip passes through the sealing ring three and the through-hole in the mounting plate in sequence and extends out of the top of the mounting plate. A mounting screw hole is provided at the top of the connector strip for connecting the handle.

[0010] Furthermore, a handle is movably connected to the top of the connector strip, and a fastening bolt is vertically inserted into the handle. The fastening bolt passes through the connector strip and is threaded into the mounting screw hole at the top of the connector strip. The handle is connected to the mounting screw hole at the top of the connector strip through the fastening bolt. Rotating the handle can drive the connector strip, the rotating shaft and the valve core to rotate synchronously, thereby realizing the valve opening and closing operation.

[0011] This utility model has the following beneficial effects: This invention solves the problem of complex overall components and easy wear and leakage at key dynamic sealing points in high-pressure ball valves by setting up a ball shell body, valve core, fixed pipe, rotating shaft, and mounting plate. A sealing ring is set inside the fixed port of the ball shell body to seal the bottom gap between the valve core and the rotating shaft. An independent mounting plate assembly is designed at the top, with a sealing ring three integrated at its bottom. After installation, the sealing ring three directly abuts against the top of the rotating shaft to form a key top dynamic seal. When the sealing ring three needs to be replaced, there is no need to disassemble the valve body or valve core. The operation process is simplified to: close the valve, so that the valve core is in the closed state, remove the handle, unscrew the mounting bolts, take out the entire mounting plate along with the aged sealing ring three, replace the new mounting plate assembly, reinstall and tighten it. This design modularizes the most easily worn top sealing point, realizes online quick replacement, and greatly simplifies maintenance work.

[0012] This invention solves the problems of difficult maintenance and replacement of the sealing structure of high-pressure ball valves, and the valve core being easily deflected by high-pressure fluid after sealing, resulting in uneven force and wear on the valve core. A limiting post is fixed in the center of the inner bottom of the ball body, and a movable opening is opened in the center of the bottom of the valve core. The limiting post is inserted into the movable opening at the bottom of the valve core to form a fit. This structure effectively restricts the radial movement of the valve core within the ball body, preventing it from shifting. When the rotating shaft drives the valve core to rotate through the connector, the radial torque and potential off-center load on the valve core can be directly distributed and absorbed by the ball body through the limiting post structure at the bottom. By stabilizing the valve core, it ensures that the connector mainly bears pure torque, avoiding unnecessary bending moments, thereby preventing bending deformation and abnormal wear of the connector. This ensures long-term stable and easy operation of the valve, indirectly protects the alignment of the sealing surface, and improves sealing reliability. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0014] Figure 1 This is a three-dimensional view of the partially cut-out structure of a high-pressure ball valve sealing structure. Figure 2 This is a three-dimensional view of the structure of the main body of the spherical shell after it has been cut open. Figure 3 This is a three-dimensional view of the valve core section after it has been cut open. Figure 4 This is a three-dimensional structural diagram of the fixed tube; Figure 5 This is a three-dimensional structural diagram of the rotating shaft; Figure 6 A three-dimensional structural diagram of the installation disk; Figure 7 A three-dimensional structural diagram of the handle; Figure 8 This is a three-dimensional view of the assembly structure of a high-pressure ball valve sealing structure.

[0015] Figure label: 1. Spherical shell body; 101. Fixed port; 102. Sealing ring one; 103. Limiting post; 104. Connecting pipe; 105. Sealing ring two; 106. Flange; 2. Valve core; 201. Connecting port; 202. Movable port; 203. Insertion port; 3. Fixed pipe; 301. Mounting ring; 4. Rotating shaft; 401. Insertion strip; 402. Mounting screw hole; 5. Mounting plate; 501. Through hole; 502. Sealing ring three; 503. Mounting bolt; 6. Handle; 601. Fastening bolt. Detailed Implementation

[0016] 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0017] Please see Figure 1-5 This utility model relates to a high-pressure ball valve sealing structure, comprising a ball shell body 1, a valve core 2, a fixing tube 3, a rotating shaft 4, and a mounting plate 5. A limit post 103 is fixed at the center of the inner bottom of the ball shell body 1. During operation, the valve core 2 is fixed within the ball shell body 1. A fixing port 101 is provided at the center of the top of the ball shell body 1. A sealing ring 102 is fixed at the lower part of the fixing port 101. The ball shell body 1 uses the fixing port 101 to fix the sealing ring 102 and the fixing tube 3, thus initially sealing the gap between the valve core 2 and the rotating shaft 4. The valve core 2 is movably connected inside the ball shell body 1. After the valve core 2 rotates, it changes the on / off state between the two connecting tubes 104. A movable port 202 is provided at the center of the bottom of the valve core 2. The limit post 103 is movably connected within the movable port 202, allowing the valve core 2 to be movably limited through the movable port 202. The column 103 restricts the position of the valve core 2 inside the ball shell body 1, reducing the deflection of the valve core 2 inside the ball shell body 1. A fixing tube 3 is fixed inside the fixing port 101 at the top of the sealing ring 102. A rotating shaft 4 is movably connected inside the fixing tube 3. The bottom end of the rotating shaft 4 abuts against the top end of the sealing ring 102. When the rotating shaft 4 rotates, it drives the valve core 2 to rotate through the plug strip 401. An installation ring 301 is fixed on the inner wall of the fixing tube 3 at the top end of the rotating shaft 4. The installation ring 301 cooperates with the installation plate 5 in the installation tube 3. The top end of the installation ring 301 is fixed with the installation plate 5. The bottom end of the installation plate 5 is fixed with the sealing ring 302. The sealing ring 302 passes through the installation plate 5 and abuts against the top end of the rotating shaft 4. The sealing ring 302 connected to the installation plate 5 further seals the gap between the rotating shaft 4 and the installation ring 301 by abutting against the top end of the rotating shaft 4.

[0018] Specifically, the outer side of the spherical shell body 1 is symmetrically connected to a connecting pipe 104 with its central axis set on the same straight line. A flange 106 is fixed at the peripheral edge of the connecting pipe 104 away from the spherical shell body 1. A sealing ring 105 is fixed at the inner wall of the connecting pipe 104 near the edge of the spherical shell body 1. The sealing ring 105 abuts against the surface of the valve core 2. The spherical shell body 1 is connected to and communicates with the external pipeline for conveying fluid through the connecting pipe 104 and the flange 106 on the connecting pipe 104. The sealing ring 105 abuts against the surface of the valve core 2 to prevent leakage when the valve core 2 rotates to the point where the two connecting pipes 104 are cut off.

[0019] Furthermore, the valve core 2 has a connecting port 201 extending along the straight line of the central axis of the two connecting pipes 104 on the outer side of the spherical body 1. The valve core 2 has a socket 203 at the center of its top. When the central axis of the connecting port 201 on the valve core 2 is aligned with the central axis of the two connecting pipes 104, the fluid flow of the valve core 2 is at its maximum. When rotated to be perpendicular to the central axis of the two connecting pipes 104, the valve core 2 completely cuts off the flow in the two connecting pipes 104. The valve core 2 is movably connected to the plug strip 401 through the socket 203.

[0020] Furthermore, a connector strip 401 is provided inside the rotating shaft 4 along the central axis. The bottom end of the connector strip 401 is inserted into the socket 203, so that the rotating shaft 4 drives the valve core 2 to rotate during rotation.

[0021] The operation process of this embodiment is as follows: During operation, when the rotating shaft 4 rotates, the torque of the rotating shaft 4 is transmitted to the valve core 2 through the plug bar 401, causing the valve core 2 to rotate. The angle between the central axis of the connecting port 201 in the valve core 2 and the straight line containing the central axes of the two connecting pipes 104 is adjusted, the area of ​​the connecting port 201 connected to the two connecting pipes 104 is adjusted, and the fluid flow rate through the two connecting pipes 104 is adjusted. During the overall rotation of the valve core 2, the valve core 2 is movably connected to the limiting post 103 in the spherical shell body 1 through the movable port 202, which restricts the position of the valve core 2 in the spherical shell body 1. The limiting post 103 disperses the radial torque generated by the rotation of the valve core 2 body, preventing the plug bar 401 from bending and deforming. Specific Implementation Example 2

[0022] Please see Figure 1-8 Based on the first specific embodiment, a through-hole 501 is vertically opened in the mounting plate 5 along the central axis. A mounting bolt 503 is vertically inserted in a ring array in the mounting plate 5 outside the sealing ring 302. The mounting bolt 503 is threaded into the mounting ring 301. The mounting plate 5 passes through the through-hole 501 and the insertion strip 401. After the mounting bolt 503 passes through the mounting plate 5, it is screwed into the mounting ring 301 and tightened. The mounting plate 5 is then installed on the mounting ring 301.

[0023] Specifically, the connector 401 passes through the sealing ring 3 502 and the through hole 501 inside the mounting plate 5 from bottom to top and extends out of the top of the mounting plate 5. The top center of the connector 401 has a mounting screw hole 402. The connector 401 extends out of the top of the mounting plate 5 and cooperates with the mounting handle 6.

[0024] Furthermore, a handle 6 is movably connected to the top of the connector strip 401. A fastening bolt 601 is vertically inserted into the handle 6. After passing through the connector strip 401, the fastening bolt 601 is threaded into the mounting screw hole 402 at the top of the connector strip 401. When installing the handle 6, after the bottom of the handle 6 is snapped into the top of the connector strip 401, the fastening bolt 601 is inserted into the handle 6 and then screwed into the mounting screw hole 402 at the top of the connector strip 401 and tightened. This completes the installation of the handle 6. By rotating the handle 6, the connector strip 401, the rotating shaft 4, and the valve core 2 are rotated.

[0025] The operation process of this embodiment is as follows: During operation, after a certain period of time, the sealing ring 502 at the bottom of the mounting plate 5 ages and the sealing effect decreases. First, rotate the handle 6 to drive the connector 401, the rotating shaft 4, and the valve core 2 to rotate. Then, the central axis of the valve core 2 rotating through the connecting port 201 is perpendicular to the central axis of the connecting pipe 104 on the ball body 1. When the valve core 2 is in the closed state, hold the handle 6 and use a wrench to unscrew the fastening bolt 601 from the mounting screw hole 402 at the top of the connector 401. Then, remove the handle 6. After removing the handle 6, use a wrench to unscrew the mounting bolts 503 one by one from the mounting ring 301. After removing the mounting plate 5 from the fixed tube 3, select a new mounting plate 5 and place it into the fixed tube 3. At the same time, the sealing ring 502 at the bottom of the mounting plate 5 passes through the mounting ring 301 and abuts against the top of the rotating shaft 4. Insert the mounting bolt 503 into the mounting plate 5 and pass it through, then screw it into the mounting ring 301 and tighten it. This will cause the sealing ring 502 to be pressed and set inside the mounting ring 301 and abut against the top of the rotating shaft 4. Then, put the handle 6 back onto the connector 401, insert the fastening bolt 601 into the handle 6, and then screw it into the mounting screw hole 402 at the top of the connector 401 and tighten it. This completes the replacement of the mounting plate 5.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A high-pressure ball valve sealing structure, comprising a ball shell body (1), a valve core (2), a fixed tube (3), a rotating shaft (4), and a mounting plate (5), characterized in that: A limiting post (103) is fixed at the center of the inner bottom of the spherical shell body (1). A fixing opening (101) is provided at the center of the top of the spherical shell body (1). A sealing ring (102) is fixed at the lower part of the fixing opening (101). A valve core (2) is movably connected inside the spherical shell body (1). A movable opening (202) is provided at the center of the bottom of the valve core (2). The limiting post (103) is movably connected inside the movable opening (202). The fixing opening (102) at the top of the sealing ring (102) is fixed at the center of the bottom of the valve core (2). 1) A fixing tube (3) is fixed inside, and a rotating shaft (4) is movably connected inside the fixing tube (3). The bottom end of the rotating shaft (4) abuts against the top end of the sealing ring (102). An installation ring (301) is fixed on the inner wall of the fixing tube (3) at the top end of the rotating shaft (4). An installation plate (5) is fixed at the top end of the installation ring (301). A sealing ring (502) is fixed at the bottom end of the installation plate (5). The sealing ring (502) passes through the installation plate (5) and abuts against the top end of the rotating shaft (4).

2. The high-pressure ball valve sealing structure according to claim 1, characterized in that: The outer side of the spherical shell body (1) is symmetrically connected to a connecting pipe (104) with its central axis set on the same straight line. A flange (106) is fixed on the peripheral edge of the connecting pipe (104) away from the spherical shell body (1). A sealing ring (105) is fixed on the inner wall of the connecting pipe (104) near the edge of the spherical shell body (1). The sealing ring (105) abuts against the surface of the valve core (2).

3. The high-pressure ball valve sealing structure according to claim 1, characterized in that: The valve core (2) has a connecting port (201) along the straight line of the central axis of the two connecting pipes (104) on the outside of the spherical body (1), and a socket (203) is opened at the center of the top of the valve core (2).

4. The high-pressure ball valve sealing structure according to claim 3, characterized in that: A connector strip (401) is provided inside the rotating shaft (4) along the central axis, and the bottom end of the connector strip (401) is inserted into the socket (203).

5. The high-pressure ball valve sealing structure according to claim 4, characterized in that: The mounting plate (5) has a through opening (501) vertically through the center axis. The mounting plate (5) outside the sealing ring (302) has a vertically through-hole in a ring array with mounting bolts (503) inserted in it. The mounting bolts (503) are threaded into the mounting ring (301).

6. The high-pressure ball valve sealing structure according to claim 5, characterized in that: The connector strip (401) passes through the opening (501) in the sealing ring (502) and the mounting plate (5) from bottom to top and extends out of the top of the mounting plate (5). A mounting screw hole (402) is provided in the center of the top of the connector strip (401).

7. The high-pressure ball valve sealing structure according to claim 6, characterized in that: The top end of the connector strip (401) is movably connected to a handle (6), and a fastening bolt (601) is vertically inserted into the handle (6). The fastening bolt (601) passes through the connector strip (401) and is threaded into the mounting screw hole (402) at the top end of the connector strip (401).

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