A high-performance pneumatic metal-sealed high-frequency ball valve

Abstract

The present invention relates to a high-performance pneumatic metal-sealed high-frequency ball valve, which belongs to the technical field of ball valves. It includes a valve body, a valve stem, a valve core and a stroke mechanism. The stroke mechanism is used to drive the valve stem to rotate. The valve core is located in the valve body, and the valve core is fixedly connected to one end of the valve stem away from the stroke mechanism; a valve seat is slidably arranged in the valve body, and the valve seat is located between the valve core and the inner wall of the valve body, and the valve seat moves in the direction away from or close to the valve core; a first dust seal ring, an elastic element and a sealing ring are arranged between the valve seat and the valve body, and the first dust seal ring and the sealing ring are both annularly sleeved on the outer wall of the valve seat, the inner wall of the first dust seal ring is fixed to the valve seat, the outer wall of the first dust seal ring abuts against the inner wall of the slide groove, the outer wall of the sealing ring is fixedly connected to the inner wall of the slide groove, the inner wall of the sealing ring abuts against the outer wall of the valve seat, and the elastic element is located between the first dust seal ring and the sealing ring. The present invention has the effect of preventing powder in the medium from entering between the valve seat and the valve body to form self-aggregating blocks, thereby extending the service life of the ball valve.

Description

Technical Field

[0001] The present application relates to the technical field of ball valves, and in particular to a high-performance pneumatic metal-sealed high-frequency ball valve. Background Art

[0002] At present, ball valves are used in pipeline systems in petrochemical, coal chemical and other industries. The medium of this system is gas + solid powder, and has self-aggregation characteristics. Self-aggregation characteristics refer to the nature of self-aggregation or condensation. The system requires the valve to be opened and closed frequently (every 5 to 35 minutes) and quickly (1.5 to 5 seconds) according to a certain procedure, and the continuous trouble-free service period of the valve meets the maintenance period of the system, which is usually 2 to 4 years.

[0003] At present, in the ball valve, after the valve core of the valve blocks the valve, the valve seat of the valve will move closer to the valve core due to the pressure of the medium, and finally the valve seat will fit on the valve core. However, a large amount of powder will enter between the valve seat and the valve body of the valve, self-agglomerate, fill the component cavity of the valve seat, block the movement of the valve seat, and make the elastic element between the valve seat and the valve body lose its elasticity, eventually causing the valve seat to lock the ball, and the valve cannot be opened and closed, losing its required function. This problem needs to be solved urgently. Summary of the invention

[0004] In order to effectively prevent powder in the medium from entering the space between the valve seat and the valve body to form self-agglomerates, avoid blocking the valve seat and damaging the elastic element, and extend the service life of the ball valve, the present application provides a high-performance pneumatic metal-sealed high-frequency ball valve.

[0005] The high-performance pneumatic metal-sealed high-frequency ball valve provided in this application adopts the following technical solution:

[0006] A high-performance pneumatic metal-sealed high-frequency ball valve comprises a valve body, a valve stem, a valve core and a stroke mechanism. The stroke mechanism is fixed on the valve body to drive the valve stem to rotate. The valve stem and the valve core are both located in the valve body. The valve core is fixedly connected to the end of the valve stem away from the stroke mechanism. A valve seat is slidably arranged in the valve body. The valve seat is located between the valve core and the inner wall of the valve body. The valve seat moves away from or close to the valve core. A sliding groove is provided on the inner wall of the valve body. The edge of the valve seat is located in the sliding groove. A first dust seal ring, The elastic element and the sealing ring, the first dust sealing ring and the sealing ring are both sleeved on the outer wall of the valve seat, the inner wall of the first dust sealing ring is fixed to the valve seat, the outer wall of the first dust sealing ring abuts against the inner wall of the slide groove, the outer wall of the sealing ring is fixedly connected to the inner wall of the slide groove, the inner wall of the sealing ring abuts against the outer wall of the valve seat, the elastic element is located between the first dust sealing ring and the sealing ring to push the valve seat to move towards the valve core; a booster component for expanding the first dust sealing ring and the sealing ring itself is arranged between the elastic element, the first dust sealing ring and the sealing ring.

[0007] By adopting the above technical scheme, after the valve core of the valve blocks the valve, the valve seat of the valve will move closer to the valve core due to the pressure of the medium, and finally the valve seat fits on the valve core, and the slideway provides a sliding path for the sliding of the valve seat. The first dust seal ring and the sealing ring separate and seal the gap between the valve seat and the valve body, and the elastic element is located exactly between the first dust seal ring and the sealing ring, so the elastic element is protected, preventing the medium from entering the gap between the valve seat and the valve body, avoiding the medium from self-aggregating into blocks and locking the valve core, thereby achieving the effect of extending the service life of the ball valve; the setting of the booster component causes the first dust seal ring and the sealing ring to expand, further enhancing the air tightness between the first dust seal ring and the valve body, and between the sealing ring and the valve seat.

[0008] Optionally, a double scraper is fixed on the valve seat, and the double scraper is located on the side wall of the valve seat facing the valve core.

[0009] By adopting the above technical solution, the double scrapers can clean the outer wall of the valve core, so that the valve core can adapt to the working conditions containing solid powder medium.

[0010] Optionally, a first annular groove is provided on the valve seat, the first annular groove is provided along an outer wall of the valve seat, and the first dust sealing ring is located in the first annular groove.

[0011] By adopting the above technical solution, the first annular groove provides a placement position for the first dust seal ring, so that the first dust seal ring is more firmly fixed to the valve seat, and the first annular groove plays a role of limiting the first dust seal ring.

[0012] Optionally, a stuffing box is arranged between the valve stem and the valve body, the stuffing box includes an upper stuffing box and a lower stuffing box, the middle of the stuffing box itself is in a partition state to form an upper chamber and a lower chamber, the upper stuffing box is located in the upper chamber and between the stuffing box and the outer wall of the valve stem, and the lower stuffing box is located in the lower chamber and between the stuffing box and the outer wall of the valve stem.

[0013] By adopting the above technical solution, the double stuffing box formed by the upper stuffing box and the lower stuffing box has a double protection effect on the gap between the valve stem and the valve body, and extends the sealing length of the gap between the valve stem and the valve body. At the same time, the partition in the middle of the stuffing box itself further enhances the sealing effect. When the valve stem moves up and down to open or close the ball valve, the sealing material in the double stuffing box will be compressed to form a sealing barrier to prevent medium leakage. The double stuffing box can also play a role in double lubrication of the valve stem and reduce the friction between the valve stem and the valve body.

[0014] Optionally, along the length direction of the valve stem, the length of the upper stuffing box is greater than the length of the lower stuffing box.

[0015] By adopting the above technical solution, since the medium is located at the valve core position, the stuffing box located below is the first sealing measure. The first sealing measure has a preliminary sealing effect. The focus is on the sealing at the upper stuffing box, so it is more reasonable that the length of the upper stuffing box is greater than the length of the lower stuffing box.

[0016] Optionally, a second annular groove is provided on the valve body, the second annular groove is located on the side wall of the valve body facing the valve stem, the second annular groove is provided around the valve body, a second dust seal ring is provided between the valve body and the valve stem, the second dust seal ring is sleeved on the outer wall of the valve stem and is located in the second annular groove, and the inner wall of the second dust seal ring is in contact with the outer wall of the valve stem.

[0017] By adopting the above technical solution, the second annular groove provides a placement position for the second dust seal ring and has a limiting effect on the second dust seal ring.

[0018] Optionally, a thrust seal bearing is provided between the valve stem and the stuffing box, and the thrust seal bearing is located below the lower stuffing box.

[0019] By adopting the above technical solution, the axial force of the valve stem acts on the sliding thrust seal bearing, so that the valve stem opens and closes smoothly and its friction resistance is reduced. At the same time, the thrust seal bearing has a sealing function to prevent a small amount of powder from entering the lower stuffing box.

[0020] Optionally, the valve core and the inner wall of the valve seat are both provided with a coating, and the coating is formed by HVOF technology.

[0021] By adopting the above technical solution, HVOF is the abbreviation of High Velocity Oxygen Fuel, which means "high-speed oxygen fuel spraying". This is a technology that uses extremely high-speed gas flow to heat the spray powder to above the melting point and spray it onto the surface of the substrate to form a coating. HVOF technology has a high heating efficiency and can spray various refractory materials such as ceramics, carbides, metals, etc. The coating has high bonding strength, high density, low porosity, good corrosion resistance, good wear resistance, and can prepare coatings with complex shapes.

[0022] Optionally, the first dust seal ring is hollow and consists of a hard area and an elastic area, and the elastic area is close to the inner wall of the valve body; the sealing ring is hollow and consists of a hard skin and an elastic skin, and the elastic skin is close to the valve seat; the elastic element includes a wave spring and a gasket, one end of the wave spring is fixed to the gasket, and the other end is fixed to the hard skin of the sealing ring, and the gasket is fixed to the outer wall of the valve seat; the booster assembly includes a positioning rod, a fixed pulley, a rack, a first pull rope, a first partition plate, a second pull rope, and a second partition plate, one end of the positioning rod is inserted and fixed to the inner wall of the valve body, and the other end is rotatably connected to the fixed pulley, and the rack is fixed in a cantilevered shape On the pad, the length direction of the rack is arranged along the deformation direction of the wave spring, and the rack is meshed with the fixed pulley; the first partition plate is located inside the first dust seal ring for space partition, and the elastic area is located in the space on the side of the first partition plate close to the fixed pulley; the second partition plate is located inside the sealing ring for space partition, and the elastic leather is located in the space on the side of the second partition plate close to the fixed pulley; one end of the first pull rope is fixed to the first partition plate, and the other end is wound on the fixed pulley, one end of the second pull rope is fixed to the second partition plate, and the other end is wound on the fixed pulley, and when the rack moves close to the valve core, the fixed pulley simultaneously winds up the first pull rope and the second pull rope.

[0023] By adopting the above technical scheme, after the valve core of the valve blocks the valve, the valve seat of the valve will move closer to the valve core due to the pressure of the medium, and finally the valve seat will fit on the valve core. The movement of the valve seat drives the rack to move, thereby driving the fixed pulley to rotate. The fixed pulley reels up the first pull rope and the second pull rope at the same time. Through the position change of the first partition plate and the second partition plate, the internal space of the first dust seal ring and the internal space of the sealing ring both produce pressure changes, so that the elastic area has a tendency to expand and bulge, so as to achieve the effect of further clinging to the inner wall of the valve body, and the elastic skin has a tendency to expand and bulge, so as to achieve the effect of further clinging to the valve seat, thereby enhancing the air tightness between the first dust seal ring and the valve body, and between the sealing ring and the valve seat.

[0024] Optionally, the positioning rod is located close to one end of the wave spring and extends deep into the wave spring, and the fixed pulley and the rack are both located inside the wave spring; the length direction of the positioning rod is arranged along the direction perpendicular to the central axis of the wave spring; a positioning groove is provided on the inner wall of the valve body, and the end of the positioning rod is embedded and fixed in the positioning groove, and a plurality of positioning grooves are provided, and adjacent positioning grooves are spaced apart along the deformation direction of the spring.

[0025] By adopting the above technical solution, the wave spring will produce fatigue after long-term use. The position of the positioning rod can be changed by inserting the positioning rod into different positioning grooves. Since the end of the positioning rod penetrates into the interior of the wave spring and acts as a limit on the wave spring, after the positioning rod changes its position, the number of turns of the wave spring between the positioning rod and the gasket can be gathered, thereby forcibly increasing the initial number of turns of the wave spring between the positioning rod and the gasket, changing the initial posture of the wave spring, so that the wave spring after long-term use can still maintain sufficient pushing force on the valve seat in the initial state.

[0026] Optionally, the wave spring material is a wave spring made of a high nickel alloy; the wave spring is placed along the sliding direction of the valve seat.

[0027] By adopting the above technical solution, the high nickel alloy has excellent corrosion resistance, high strength and high temperature resistance. The fixing method of the elastic element can make the valve seat and the sealing ring mutually leverage each other, and the mutual force makes the sealing ring more firmly fixed on the valve body.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The first dust seal ring and the sealing ring separate and seal the gap between the valve seat and the valve body, and the elastic element is located between the first dust seal ring and the sealing ring, so it protects the elastic element and prevents the medium from entering the gap between the valve seat and the valve body, avoiding the medium from self-aggregating into blocks and locking the valve core, thereby extending the service life of the ball valve;

[0030] 2. The double stuffing box formed by the upper stuffing box and the lower stuffing box has a double protection effect on the gap between the valve stem and the valve body, and extends the sealing length of the gap between the valve stem and the valve body. At the same time, the partition in the middle of the stuffing box itself further enhances the sealing effect. When the valve stem moves up and down to open or close the ball valve, the sealing material in the double stuffing box will be compressed to form a sealing barrier to prevent medium leakage. The double stuffing box can also double the lubrication of the valve stem and reduce the friction between the valve stem and the valve body;

[0031] 3. The axial force of the valve stem acts on the sliding thrust seal bearing, which makes the valve stem open and close and rotates smoothly and reduces its friction resistance. At the same time, the thrust seal bearing has a sealing function to prevent a small amount of powder from entering the lower stuffing box. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0033] Figure 2 is a stereogram of an embodiment of the present application;

[0034] Figure 3It is a local structural schematic diagram of the location of the supercharger assembly;

[0035] Figure 4 It is a partial structural schematic diagram of the position of the fixed pulley and the positioning rod relative to the wave spring;

[0036] Figure 5 yes Figure 1 A partial enlarged schematic diagram of part A;

[0037] Figure 6 yes Figure 1 A partial enlarged schematic diagram of part B;

[0038] Figure 7 yes Figure 1 A partial enlarged schematic diagram of part C in the middle.

[0039] In the figure, 1, valve body; 11, slide groove; 12, first dust seal ring; 121, hard area; 122, elastic area; 13, elastic element; 131, wave spring; 132, gasket; 14, sealing ring; 141, hard skin; 142, elastic skin; 15, double scraper; 16, second annular groove; 17, positioning groove; 2, valve stem; 3, valve core; 4, valve seat; 41, first annular groove; 5, stroke mechanism; 6, stuffing box; 61, upper chamber; 611, upper stuffing box; 62, lower chamber; 621, lower stuffing box; 7, thrust seal bearing; 8, second dust seal ring; 9, booster assembly; 91, positioning rod; 92, fixed pulley; 93, rack; 94, first pull rope; 95, first partition plate; 96, second pull rope; 97, second partition plate. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0041] The embodiment of the present application discloses a high-performance pneumatic metal-sealed high-frequency ball valve.

[0042] refer to Figure 1 and Figure 2 A high-performance pneumatic metal-sealed high-frequency ball valve includes a valve body 1, a valve stem 2, a valve core 3 and a travel mechanism 5. The travel mechanism 5 is fixed on the valve body 1 to drive the valve stem 2 to rotate. It is usually composed of one or more components, which can enable the valve to move according to a predetermined stroke during the opening and closing process. The main function of the travel mechanism 5 is to accurately control the opening of the valve to meet the system's requirements for flow, pressure or other parameters. It can be operated manually, electrically, pneumatically or hydraulically, which will not be described in detail here, and is well known to those in the field.

[0043] refer to Figure 1 and Figure 2, the valve stem 2 and the valve core 3 are both located in the valve body 1, and the valve core 3 is fixedly connected to the end of the valve stem 2 away from the stroke mechanism 5; a valve seat 4 is slidably arranged in the valve body 1, and the valve seat 4 is located between the valve core 3 and the inner wall of the valve body 1. The valve seat 4 moves away from or close to the valve core 3. A slide groove 11 is provided on the inner wall of the valve body 1, and the edge of the valve seat 4 is located in the slide groove 11. The length direction of the slide groove 11 is opened along the sliding direction of the valve seat 4; the slide groove 11 provides a sliding path for the sliding of the valve seat 4. A first dust seal ring 12, an elastic element 13 and a sealing ring 14 are arranged between the valve seat 4 and the valve body 1, and the first dust seal ring 12, the elastic element 13 and the sealing ring 14 are also located in the slide groove 11.

[0044] refer to Figures 1 to 3 The valve seat 4 is provided with a first annular groove 41, which is provided along the outer wall of the valve seat 4. The first dust seal ring 12 is located in the first annular groove 41 and is fixedly connected to the valve seat 4. The outer wall of the first dust seal ring 12 abuts against the inner wall of the slide groove 11. The first dust seal ring 12 is hollow and consists of a hard area 121 and an elastic area 122. The elastic area 122 is in close contact with the inner wall of the slide groove 11. The sealing ring 14 is sleeved on the outer wall of the valve seat 4. The outer wall of the sealing ring 14 is fixedly connected to the inner wall of the slide groove 11. The inner wall of the sealing ring 14 abuts against the outer wall of the valve seat 4. The sealing ring 14 is hollow and consists of a hard skin 141 and an elastic skin 142. The elastic skin 142 is in close contact with the valve seat 4. The elastic element 13 is located between the first dust seal ring 12 and the sealing ring 14 to push the valve seat 4 to move toward the valve core 3; the elastic element 13 includes a wave spring 131 and a gasket 132, one end of the wave spring 131 is fixed to the gasket 132, and the other end is fixed to the hard skin 141 of the sealing ring 14, and the gasket 132 is fixed to the outer wall of the valve seat 4.

[0045] refer to Figure 3 and Figure 4The booster assembly 9 includes a positioning rod 91, a fixed pulley 92, a rack 93, a first pull rope 94, a first partition plate 95, a second pull rope 96, and a second partition plate 97. One end of the positioning rod 91 is inserted and fixed to the inner wall of the valve body 1, and the other end is rotatably connected to the fixed pulley 92. The rack 93 is fixed on the cushion block 132 in a cantilevered shape. The length direction of the rack 93 is set along the deformation direction of the wave spring 131, and the rack 93 is engaged with the fixed pulley 92. The first partition plate 95 is located inside the first dust seal ring 12 for space partition, that is, the first partition plate 95 divides the space inside the first dust seal ring 12 into two; the elastic area 122 is located in the space of the first partition plate 95 close to the fixed pulley 92. The second partition plate 97 is located inside the sealing ring 14 for space partition. Similarly, the second partition plate 97 divides the space inside the sealing ring 14 into two, and the elastic skin 142 is located in the space of the second partition plate 97 close to the fixed pulley 92. One end of the first pull rope 94 is fixed to the first partition plate 95, and the other end is rolled up on the fixed pulley 92. One end of the second pull rope 96 is fixed to the second partition plate 97, and the other end is rolled up on the fixed pulley 92. When the rack 93 moves closer to the valve core 3, the fixed pulley 92 rolls up the first pull rope 94 and the second pull rope 96 at the same time.

[0046] refer to Figure 3 and Figure 4 After the valve core 3 of the valve blocks the valve, the valve seat 4 of the valve will move closer to the valve core 3 due to the pressure of the medium, and finally the valve seat 4 is attached to the valve core 3. The movement of the valve seat 4 drives the rack 93 to move, thereby driving the fixed pulley 92 to rotate. The fixed pulley 92 reels the first pull rope 94 and the second pull rope 96 at the same time. Through the position change of the first partition plate 95 and the second partition plate 97, the internal space of the first dust seal ring 12 and the internal space of the sealing ring 14 both produce pressure changes, so that the elastic area 122 has a tendency to expand and bulge, so as to achieve the effect of further close to the inner wall of the valve body 1, and the elastic skin 142 has a tendency to expand and bulge, so as to achieve the effect of further close to the valve seat 4, thereby enhancing the air tightness between the first dust seal ring 12 and the valve body 1, and between the sealing ring 14 and the valve seat 4.

[0047] refer to Figure 4 The wave spring 131 is made of a high nickel alloy.

[0048] refer to Figure 3 and Figure 4The end of the positioning rod 91 close to the wave spring 131 is deeply inserted into the wave spring 131, and the fixed pulley 92 and the rack 93 are both located inside the wave spring 131; the length direction of the positioning rod 91 is arranged along the direction of the central axis of the wave spring 131; a positioning groove 17 is provided on the inner wall of the valve body 1, and the end of the positioning rod 91 is fixed in the positioning groove 17, and a plurality of positioning grooves 17 are provided, and adjacent positioning grooves 17 are provided at intervals along the spring deformation direction. When the wave spring 131 is used for a long time, fatigue will occur. The position of the positioning rod 91 can be changed by inserting the positioning rod 91 into different positioning grooves 17. Since the end of the positioning rod 91 penetrates into the interior of the wave spring 131, it limits the wave spring 131. After the positioning rod 91 changes its position, the number of turns of the wave spring 131 between the positioning rod 91 and the cushion block 132 can be brought together, thereby forcibly increasing the initial number of turns of the wave spring 131 between the positioning rod 91 and the cushion block 132, changing the initial posture of the wave spring 131, so that the wave spring 131 after long-term use still maintains sufficient pushing force on the valve seat 4 in the initial state.

[0049] refer to Figure 3 A double scraper 15 is fixed on the valve seat 4. The double scraper 15 is located on the side wall of the valve seat 4 facing the valve core 3. When the valve core 3 of the valve blocks the valve, the valve seat 4 of the valve will move closer to the valve core 3 under the pressure of the medium, and finally the valve seat 4 is attached to the valve core 3. At this time, the scraper is in close contact with the valve core 3.

[0050] refer to Figure 1 , Figure 2 and Figure 5 A stuffing box 6 is arranged between the valve stem 2 and the valve body 1, and the stuffing box 6 includes an upper stuffing box 611 and a lower stuffing box 621. The middle of the stuffing box 6 itself is in a partition state to form an upper chamber 61 and a lower chamber 62. The upper stuffing box 611 is located in the upper chamber 61 and between the stuffing box 6 and the outer wall of the valve stem 2. The lower stuffing box 621 is located in the lower chamber 62 and between the stuffing box 6 and the outer wall of the valve stem 2. Along the length direction of the valve stem 2, the length of the upper stuffing box 611 is greater than that of the lower stuffing box 621, that is, the length of the upper chamber 61 is greater than that of the lower chamber 62.

[0051] refer to Figure 1 , Figure 2 and Figure 6 A second dust seal ring 8 is arranged between the valve body 1 and the valve stem 2. A second annular groove 16 is opened on the valve body 1. The second annular groove 16 is located on the side wall of the valve body 1 facing the valve stem 2. The second annular groove 16 is opened around the valve body 1. The second dust seal ring 8 is sleeved on the outer wall of the valve stem 2 and is located in the second annular groove 16 and fixedly connected to the valve body 1. The inner wall of the second dust seal ring 8 abuts against the outer wall of the valve stem 2.

[0052] refer to Figure 1 , Figure 2 and Figure 7 A thrust seal bearing 7 is arranged between the valve stem 2 and the stuffing box 6, and the thrust seal bearing 7 is located below the lower stuffing box 621. The inner walls of the valve core 3 and the valve seat 4 are both provided with a coating, and the coating is formed by HVOF technology.

[0053] The implementation principle of a high-performance pneumatic metal-sealed high-frequency ball valve in the embodiment of the present application is as follows: the sealing degree of the gap between the valve seat 4 and the valve body 1 is strengthened by the sealing ring 14 and the first dust seal ring 12, thereby preventing the medium from entering the gap between the valve seat 4 and the valve body 1, avoiding the medium from self-aggregating into a block and locking the valve core 3, thereby achieving the effect of extending the service life of the ball valve; a double stuffing box is formed by the upper stuffing box 611 and the lower stuffing box 621, which plays a double sealing role on the gap between the valve stem 2 and the valve body 1, further extending the service life of the ball valve. The setting of the booster assembly 9 causes the first dust seal ring 12 and the sealing ring 14 to expand, further enhancing the air tightness between the first dust seal ring 12 and the valve body 1, and between the sealing ring 14 and the valve seat 4.

[0054] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-performance pneumatic metal-sealed high-frequency ball valve, comprising a valve body (1), a valve stem (2), a valve core (3) and a travel mechanism (5), wherein the travel mechanism (5) is fixed on the valve body (1) and is used to drive the valve stem (2) to rotate, the valve stem (2) and the valve core (3) are both located in the valve body (1), and the valve core (3) is fixedly connected to one end of the valve stem (2) away from the travel mechanism (5); characterized in that: A valve seat (4) is slidably arranged in the valve body (1), the valve seat (4) is located between the valve core (3) and the inner wall of the valve body (1), the valve seat (4) moves in a direction away from or close to the valve core (3), a slide groove (11) is provided on the inner wall of the valve body (1), and the edge of the valve seat (4) is located in the slide groove (11); a first dust seal ring (12), an elastic element (13) and a sealing ring (14) are arranged between the valve seat (4) and the valve body (1), the first dust seal ring (12) and the sealing ring (14) are both annularly sleeved on the outer wall of the valve seat (4), the inner wall of the first dust seal ring (12) is fixed to the valve seat (4), the outer wall of the first dust seal ring (12) is in contact with the inner wall of the slide groove (11), the outer wall of the sealing ring (14) is fixedly connected to the inner wall of the slide groove (11), and the inner wall of the sealing ring (14) is in contact with the valve seat ( 4) outer wall abuts against the first dust seal ring (12) and the sealing ring (14), the elastic element (13) is located between the first dust seal ring (12) and the sealing ring (14) for pushing the valve seat (4) to move towards the valve core (3); a booster component (9) is provided between the elastic element (13), the first dust seal ring (12) and the sealing ring (14) for expanding the first dust seal ring (12) and the sealing ring (14); the first dust seal ring (12) is hollow and consists of a hard area (121) and an elastic area (122), and the elastic area (122) is in close contact with the inner wall of the valve body (1); the sealing ring (14) is hollow and consists of a hard skin (141) and an elastic skin (142), and the elastic skin (142) is in close contact with the valve seat (4); the elastic element (13) includes a wave spring ( 131) and a cushion block (132), one end of the wave spring (131) is fixed to the cushion block (132), and the other end is fixed to the hard skin (141) of the sealing ring (14), and the cushion block (132) is fixed to the outer wall of the valve seat (4); the booster assembly (9) comprises a positioning rod (91), a fixed pulley (92), a rack (93), a first pull rope (94), a first partition plate (95), a second pull rope (96), and a second partition plate (97), one end of the positioning rod (91) is inserted and fixed to the inner wall of the valve body (1), and the other end is rotatably connected to the fixed pulley (92), the rack (93) is fixed on the cushion block (132) in a cantilevered shape, the length direction of the rack (93) is arranged along the deformation direction of the wave spring (131), and the rack (93) is meshed with the fixed pulley (92) The first partition plate (95) is located inside the first dust seal ring (12) for space partition, the elastic area (122) is located in the space on the side of the first partition plate (95) close to the fixed pulley (92), the second partition plate (97) is located inside the sealing ring (14) for space partition, and the elastic skin (142) is located in the space on the side of the second partition plate (97) close to the fixed pulley (92); one end of the first pull rope (94) is fixed to the first partition plate (95), and the other end is wound on the fixed pulley (92), one end of the second pull rope (96) is fixed to the second partition plate (97), and the other end is wound on the fixed pulley (92), when the rack (93) moves close to the valve core (3), the fixed pulley (92) simultaneously winds up the first pull rope (94) and the second pull rope (96).

2. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 1, characterized in that: A double scraper (15) is fixed on the valve seat (4), and the double scraper (15) is located on the side wall of the valve seat (4) facing the valve core (3).

3. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 1, characterized in that: The valve seat (4) is provided with a first annular groove (41), the first annular groove (41) is provided along the outer wall of the valve seat (4), and the first dust seal ring (12) is located in the first annular groove (41).

4. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 1, characterized in that: A stuffing box (6) is provided between the valve stem (2) and the valve body (1), and the stuffing box (6) comprises an upper stuffing box (611) and a lower stuffing box (621). The middle of the stuffing box (6) is in a partitioned state to form an upper chamber (61) and a lower chamber (62). The upper stuffing box (611) is located in the upper chamber (61) and between the stuffing box (6) and the outer wall of the valve stem (2), and the lower stuffing box (621) is located in the lower chamber (62) and between the stuffing box (6) and the outer wall of the valve stem (2).

5. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 4, characterized in that: Along the length direction of the valve stem (2), the length of the upper stuffing box (611) is greater than the length of the lower stuffing box (621).

6. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 4, characterized in that: The valve body (1) is provided with a second annular groove (16), the second annular groove (16) being located on the side wall of the valve body (1) facing the valve stem (2), the second annular groove (16) being provided around the valve body (1), a second dust seal ring (8) being provided between the valve body (1) and the valve stem (2), the second dust seal ring (8) being sleeved on the outer wall of the valve stem (2) and being located in the second annular groove (16), the inner wall of the second dust seal ring (8) being in contact with the outer wall of the valve stem (2).

7. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 4, characterized in that: A thrust seal bearing (7) is provided between the valve stem (2) and the stuffing box (6), and the thrust seal bearing (7) is located below the lower stuffing box (621).

8. The high-performance pneumatic metal-sealed high-frequency ball valve according to claim 1 is characterized in that: A positioning groove (17) is provided on the inner wall of the valve body (1), and the end of the positioning rod (91) is fixedly embedded in the positioning groove (17). A plurality of positioning grooves (17) are provided, and adjacent positioning grooves (17) are provided at intervals along the spring deformation direction.

9. A high-performance pneumatic metal-sealed high-frequency ball valve according to claim 1, characterized in that: The end of the positioning rod (91) close to the wave spring (131) is deeply inserted into the wave spring (131), and the fixed pulley (92) and the rack (93) are both located inside the wave spring (131); the length direction of the positioning rod (91) is arranged along the direction perpendicular to the central axis of the wave spring (131).

Images