Ultra-high pressure metal seal fixed ball valve

Abstract

The present application relates to the technical field of ball valve, in particular to a kind of ultra-high pressure metal seal fixed ball valve, including valve body, valve cover, ball, valve seat and valve stem, the inside of the valve body is provided with middle cavity and passage, the valve seat is installed in valve body and is matched with the sealing surface of ball, the surface of the valve seat towards ball is provided with scraper, the scraper is connected to the valve seat by floating mechanism, the floating mechanism is configured to make scraper always elastically adhere to its surface and can swing self-adaptation when ball rotates.The present application always presses scraper to the surface of ball by floating mechanism pre-tightening scraper;When valve is opened and closed, it will push scraper, scraper is connected with a rotating block that can rotate around fixed shaft by rotating rod, this lever and hinge structure make scraper not only can retreat compression spring, but also can produce micro swing;Realize that scraper is dynamically self-adapted to adhere to the surface of ball and clean, not only can effectively scrape off impurities to prevent sealing surface deposition, but also can avoid when encountering large particles to prevent jam.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and specifically to an ultra-high pressure metal-sealed fixed ball valve. Background Technology

[0002] Ball valves are generally divided into two types: floating ball valves and fixed ball valves. Floating ball valves are generally used in small and medium diameter, low and medium pressure pipelines. When the nominal diameter of the valve DN≥200mm and the pressure PN≥10MPa, a fixed ball valve is generally used. However, when the operating temperature T≥200℃, the sealing ring will age and deform due to the temperature limitation of the material, which will cause the valve to fail to work properly. Under normal circumstances, when the valve pressure PN≥100MPa, the valve is classified as an ultra-high pressure valve. Ultra-high pressure valves usually adopt a metal seal design and ensure reliable sealing and long service life under harsh conditions through special structural design.

[0003] Existing ultra-high pressure valves cannot guarantee long-term sealing reliability under harsh operating conditions. Due to the combined effect of ultra-high pressure and high temperature, the sealing surface between the valve seat and the ball is prone to micro-deformation and uneven wear. At the same time, impurities in the medium are more likely to be deposited at the sealing interface, causing the metal-to-metal hard seal effect to decay rapidly and triggering the risk of internal leakage.

[0004] In addition, the scraper structure of existing ultra-high pressure valves designed for self-cleaning is mostly rigid and fixed, which cannot effectively adapt to the contour changes of the ball caused by thermal deformation, processing errors or wear, and is also difficult to effectively avoid hard particles. This not only greatly reduces the cleaning effect, but may even aggravate the damage to the ball surface or sealing surface, forming a vicious cycle.

[0005] Therefore, an ultra-high pressure metal-sealed fixed ball valve is proposed to solve the above-mentioned problems. Summary of the Invention

[0006] Technical problems to be solved

[0007] To address the aforementioned shortcomings of existing technologies, this invention provides an ultra-high pressure metal-sealed fixed ball valve, which solves the technical problems of poor sealing reliability, unstable operating torque, and easy jamming caused by impurity deposition on the sealing surface, component wear and deformation, and vibration and impact in existing ultra-high pressure fixed ball valves under harsh working conditions.

[0008] Technical solution

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] This invention provides an ultra-high pressure metal-sealed fixed ball valve, comprising a valve body, a valve cover, a ball, a valve seat, and a valve stem. The valve body has an internal cavity and a channel. The valve seat is installed inside the valve body and cooperates with the sealing surface of the ball. A scraper is provided on the surface of the valve seat facing the ball. The scraper is connected to the valve seat through a floating mechanism. The floating mechanism is configured to make the scraper always elastically attached to the surface of the ball and able to swing adaptively when the ball rotates.

[0011] The floating mechanism is also connected to a hydraulic damping mechanism, which is configured to provide bidirectional damping force to the oscillation of the scraper.

[0012] Furthermore, the surface of the valve seat is provided with a mounting groove, and the floating mechanism includes:

[0013] The mounting base plate is slidably disposed within the mounting groove;

[0014] An elastic element is disposed between the mounting base plate and the inner wall of the mounting groove;

[0015] And a hinge assembly disposed between the mounting base plate and the scraper, wherein the scraper is connected to the mounting base plate via the hinge assembly.

[0016] Further, the hinge assembly includes:

[0017] A fixed shaft is fixed within the mounting groove;

[0018] The rotating block is rotatably mounted on the fixed shaft;

[0019] The rotating rod is fixed to the mounting base plate and is rotatably connected to the rotating block.

[0020] Furthermore, the hydraulic damping mechanism includes:

[0021] A connecting rod, one end of which is connected to the rotating rod;

[0022] A sleeve is fixed to the rotating block and has an inner cavity; the inner cavity of the sleeve is divided into a first chamber and a second chamber by a partition, and the partition has a throttling orifice that connects the first chamber and the second chamber;

[0023] The first piston block is slidably disposed in the inner cavity of the sleeve, and the first piston block is connected to the other end of the connecting rod.

[0024] Furthermore, the hydraulic damping mechanism also includes a second piston block that is slidably disposed within the second chamber.

[0025] Furthermore, a baffle is provided at the opening of the mounting groove, and the baffle has a swing groove for the scraper to pass through and swing.

[0026] Furthermore, a protective cover with a sealing mounting groove is provided between the mounting base plate and the baffle.

[0027] Furthermore, the head of the valve seat is provided with an elastic groove to improve its elastic compensation capability.

[0028] Furthermore, a stuffing box is provided on the top of the valve cover, the valve stem passes through the stuffing box, and a packing assembly with preload provided by a disc spring is provided inside the stuffing box.

[0029] Furthermore, an anti-static device is provided between the valve stem and the valve cover, a first sliding bearing is provided between the valve stem and the valve cover, and a second sliding bearing is provided between the ball and the valve body and the valve cover.

[0030] Beneficial effects

[0031] The technical solution provided by this invention has the following advantages compared with the prior art:

[0032] This invention utilizes an elastic element to pre-tighten a mounting base plate within the mounting groove on the inner side of the valve seat, ensuring that the scraper is always pressed against the surface of the ball. When the valve is opened or closed and the ball rotates, the ball surface pushes the scraper. The scraper is connected to a rotating block that can rotate around a fixed axis via a rotating rod on its back. This lever and hinge structure allows the scraper to not only retract and compress the spring but also generate a slight oscillation. This achieves dynamic adaptive contact and cleaning of the ball surface by the scraper, effectively removing impurities to prevent deposits on the sealing surface, avoiding large particles to prevent jamming, and automatically compensating for the ball's machining errors and wear, significantly improving sealing reliability and service life.

[0033] By connecting the rotating rod to a connecting rod, the first piston block at the end of the connecting rod extends into an arc-shaped sleeve divided into two chambers by a partition. The two chambers are connected through a throttling orifice and filled with hydraulic oil. When the scraper swings and drives the rotating rod to rotate, it drives the first piston block to slide inside the sleeve, forcing the hydraulic oil to flow slowly between the two chambers through the throttling orifice. The damping force generated in this process is transmitted in the opposite direction to the scraper. This provides bidirectional buffering and damping for the floating of the scraper, effectively suppressing high-frequency vibration and abnormal oscillation caused by pressure fluctuations or media impacts, making the scraper movement smoother, greatly reducing the risk of mechanical fatigue and wear, and ensuring the long-lasting and stable cleaning effect.

[0034] In summary, the metal-sealed fixed ball valve of this device exhibits minimal seat deformation, light operating torque, reliable sealing, and long service life, making it particularly suitable for extreme conditions under ultra-high pressure. Furthermore, the valve seat features an elastic compensation design; grooves are machined on the sealing surface to fulfill this compensation function. Even with errors in ball machining accuracy, uneven wear, or high-temperature deformation, the valve seat provides sufficient compensation, extending its service life. The valve stem also employs an anti-seize structure, with the first sliding bearing effectively preventing accidental jamming of the valve stem due to foreign objects or sudden torque increases. In particular, the valve stem packing dynamic load design, with a disc spring providing a certain preload, ensures that packing wear caused by frequent valve opening and closing under high temperature and pressure conditions is compensated for, guaranteeing excellent sealing performance. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0036] Figure 1 This is a cross-sectional view of the internal structure of the ball valve in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the external structure of the ball valve in an embodiment of the present invention;

[0038] Figure 3 for Figure 1 Enlarged schematic diagram of the structure at point A in the diagram;

[0039] Figure 4 for Figure 1 Enlarged schematic diagram of the structure at point B in the diagram;

[0040] Figure 5 This is an exploded view of the ball valve structure in an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram illustrating the action of the scraper and floating mechanism on the ball in an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of the scraper being installed in the floating mechanism in an embodiment of the present invention;

[0043] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C;

[0044] Figure 9 This is a schematic diagram of the scraper being installed in the baffle in an embodiment of the present invention;

[0045] Figure 10 This is a schematic diagram of the floating mechanism structure in an embodiment of the present invention;

[0046] Figure 11 This is a schematic cross-sectional view of the hydraulic damping mechanism in an embodiment of the present invention.

[0047] The labels in the diagram represent: 1. Valve body; 101. Central cavity; 102. Channel; 103. Stuffing box; 104. Elastic groove; 2. Valve cover; 3. Ball; 4. Valve seat; 401. Mounting groove; 5. Valve stem; 6. Connecting support plate; 7. First graphite packing; 8. First lip seal packing; 9. Gasket; 10. Disc spring; 11. Pressure ring; 12. Second graphite packing; 13. Second lip seal packing; 14. First sliding shaft. 15. Antistatic device; 16. Second sliding bearing; 17. Scraper; 18. Elastic element; 19. Mounting base plate; 20. Baffle; 21. Swing groove; 22. Protective cover; 23. Fixed shaft; 24. Rotating block; 25. Rotating rod; 26. Connecting rod; 27. Slide groove; 28. First piston block; 29. ​​Sleeve; 30. Partition plate; 31. First chamber; 32. Second chamber; 33. Throttling orifice; 34. Second piston block. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0049] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0052] The present invention will be further described below with reference to embodiments.

[0053] Example:

[0054] Please refer to the appendix. Figure 1-11 This solution proposes an ultra-high pressure metal-sealed fixed ball valve, comprising a valve body 1, a valve cover 2, a ball 3, a valve seat 4, a valve stem 5, and a connecting support plate 6, wherein:

[0055] like Figure 1 As shown, a central cavity 101 is provided inside the valve body 1, and channels 102 are provided on both sides of the valve body 1 respectively; a ball 3 is installed in the central cavity 101 inside the valve body 1, and a through channel 102 is provided on the ball 3. An annular step is provided at the connection between the channel 102 and the central cavity 101, and a valve seat 4 is installed in the step of the valve body 1.

[0056] like Figure 1 , Figure 2 As shown, the valve cover 2 is fixed to the top of the valve body 1 by studs and nuts, and the valve stem 5 passes through the valve stem hole on the valve cover 2 and is connected to the upper end of the valve cover 2.

[0057] like Figure 3 As shown, a stuffing box 103 is also provided on the top of the valve cover 2, and a first graphite packing 7 and a first lip seal packing 8 are installed inside it. The first graphite packing 7 and the first lip seal packing 8 are separated by a gasket 9.

[0058] Graphite packing possesses excellent self-lubricating properties, high-temperature resistance, and chemical stability. It is used to provide a reliable main seal. Under clamping force, the soft graphite packing expands radially, tightly adhering to the outer circumference of the valve stem 5 and the inner wall of the stuffing box 103, blocking leakage channels. Its self-lubricating properties help reduce the frictional torque during valve stem 5 rotation.

[0059] Lip seal packing is typically made of media-resistant elastic polymer, with a lip-shaped cross-section. The unique advantage of lip seals lies in their unidirectional sealing characteristics and the lip's responsiveness. When subjected to pressure from the valve cavity, the media pressure acts on the back of the lip, causing it to grip the valve stem 5 more tightly, forming a pressure-self-tightening seal. The higher the pressure, the better the sealing effect. This design is well-adaptable to minor vibrations and eccentricities of the valve stem 5.

[0060] like Figure 1 , Figure 2 , Figure 3 As shown, the connecting support plate 6 is bolted to the top of the valve cover 2, and the top of the connecting support plate 6 is equipped with an ISO standard flange for mounting gearboxes or other actuators. A disc spring 10 and a pressure ring 11 are provided between the connecting support plate 6, the valve stem 5, and the first graphite packing 7 in the stuffing box 103. The disc spring 10 is located above the pressure ring 11 and has a certain preload. This is used to prevent high-pressure media in the valve cavity from leaking outwards along the valve stem 5, while ensuring that the valve stem 5 can rotate freely.

[0061] After valves are frequently opened and closed over a long period or subjected to temperature cycles, the packing will inevitably wear and creep, leading to a decrease in preload and seal failure. The elastic properties of the disc spring 10 allow it to automatically release displacement when the packing volume decreases, continuously applying a nearly constant clamping force to the packing, thereby compensating for wear, achieving dynamic load sealing, and greatly extending the service life of the packing and improving sealing reliability.

[0062] like Figure 4 , Figure 6 As shown, a scraper 17 tangential to the surface of the ball 3 is provided at the contact point between the valve seat 4 and the ball 3, and an elastic groove 104 is provided at the head of the valve seat 4, with the elastic groove 104 located above the scraper 17. Under ultra-high pressure conditions, solid particles, easily crystallizing substances, or high molecular polymers that may be contained in the medium are very likely to deposit and harden on the sealing surface of the ball.

[0063] The scraping action of scraper 17 effectively removes impurities before they can firmly adhere to the surface, preventing their accumulation between the sealing interface of ball 3 and valve seat 4. When the valve is closed and the medium pressure acts on the back of valve seat 4, the presence of elastic groove 104 makes the head of valve seat 4 a cantilever beam structure with a certain degree of elasticity. Under the push of medium pressure, the head of valve seat 4 will produce a slight elastic deformation towards ball 3, thereby increasing the specific pressure on the sealing surface.

[0064] like Figure 4 As shown, a second graphite packing 12 and a second lip seal packing 13 are provided between the valve seat 4 and the valve body 1 to ensure the sealing of the valve seat 4. At the same time, the second graphite packing 12 has a fireproof function.

[0065] like Figure 1 As shown, a first sliding bearing 14 is provided between the valve stem 5 and the valve cover 2 and the connecting support plate 6 respectively; a second sliding bearing 16 is also provided between the ball 3 and the valve body 1 and the valve cover 2 respectively; the first sliding bearing 14 and the second sliding bearing 16 can effectively reduce the valve torque.

[0066] Meanwhile, an anti-static device 15 is provided on the outer circle of the valve stem 5, which contacts the valve cover 2. The anti-static device 15 has a side hole on the outer circle of the valve stem 5, and a spring is installed in the side hole. The outer end of the spring presses a conductive ball against the inner wall of the valve cover 2. During valve operation, this provides a reliable discharge path for the static charge that may accumulate on the ball 3 and the valve stem 5, preventing electrostatic sparking and thus eliminating the potential risk of explosion.

[0067] In summary, the metal-sealed fixed ball valve of this device exhibits minimal seat deformation, light operating torque, reliable sealing, and long service life, making it particularly suitable for extreme working conditions under ultra-high pressure.

[0068] Meanwhile, a scraper 17 is provided, which has a self-cleaning function during the opening and closing of the ball 3 and the valve seat 4. It can effectively prevent the media from depositing and adhering between the ball 3 and the valve seat 4, ensuring smooth and continuous valve opening and closing without jamming.

[0069] In addition, the valve seat 4 is designed with elastic compensation function. The sealing surface of the valve seat 4 is machined with grooves to meet the compensation function. When there are errors in the machining accuracy of the ball 3, uneven wear, or high temperature deformation, the valve seat 4 can provide sufficient compensation and improve its service life.

[0070] Furthermore, the valve stem 5 adopts an anti-seize structure, and the first sliding bearing 14 can effectively prevent the valve stem 5 from accidentally getting stuck due to foreign objects or a sudden increase in torque.

[0071] In particular, the valve stem 5 has a dynamic load design for the packing, and the disc spring 10 has a certain preload, which can ensure that the packing wear caused by frequent valve opening and closing under high temperature and high pressure conditions can be compensated, thus ensuring its good sealing performance.

[0072] The difference is, for example Figure 6 , Figure 7 , Figure 8 As shown, the inner surface of the valve seat 4 is provided with mounting grooves 401 that are equidistantly distributed in a circular pattern. A floating mechanism is installed in the mounting grooves 401, and the scraper 17 is installed on the floating mechanism.

[0073] Under conditions of ultra-high pressure, high temperature, or media containing solid particles, the rigidly fixed scraper 17 of the valve seat 4 cannot effectively cope with the obstruction caused by impurity deposition, equipment deformation (such as thermal deformation and wear), and hard particles on the surface of the ball 3. This leads to internal leakage of the valve, abnormally high operating torque, and difficulty in opening and closing, significantly reducing the reliability and lifespan of the equipment. Therefore, the design of the floating mechanism enables the scraper 17 to dynamically adapt to the spherical surface, ensuring effective cleaning and preventing jamming.

[0074] Specifically, such as Figure 8 , Figure 10 As shown, the floating mechanism includes a mounting base plate 19 that is slidably installed in the mounting groove 401. Two sets of elastic elements 18 are fixedly connected to the side of the mounting base plate 19 facing the inside of the mounting groove 401. The other ends of the two sets of elastic elements 18 are connected to the inner wall of the mounting groove 401. In this embodiment, the elastic element 18 is a spring.

[0075] The scraper 17 is mounted on the outer surface of the mounting base plate 19, facing the ball 3. Two sets of symmetrically arranged elastic elements 18 are always in a compressed or stretched state, providing the mounting base plate 19 with a continuous normal force pointing towards the center of the ball 3. This force is directly transmitted to the scraper 17 through the mounting base plate 19, ensuring that the scraper tip is constantly pressed against the ball sealing surface regardless of the valve's state. This ensures that even when the valve is not activated for a long time or is slowly adjusted, the scraper 17 can always provide a stable contact pressure to the surface of the ball 3. The continuous contact pressure ensures that the scraper 17 can effectively scrape away hardened impurities, coke, or polymers from the surface of the ball 3, preventing their accumulation in the sealing area. This directly ensures the cleanliness of the metal sealing surface between the valve seat 4 and the ball 3, significantly reducing the risk of internal leakage, especially when conveying easily crystallizing or high-viscosity media.

[0076] The mounting base plate 19 is slidably mounted within the mounting groove 401, meaning it can move within a certain range radially along the sphere 3 under the constraint of the elastic element 18. When the sphere 3 has a slight ellipticity due to machining errors, uneven wear of the sealing surface due to long-term use, or even thermal deformation due to temperature changes, the actual contour of the sphere 3 will deviate from the ideal spherical shape. The rigid scraper 17 cannot adapt to this contour change, which can lead to excessively large local gaps (cleaning failure) or excessively tight local interference (increased torque, accelerated wear).

[0077] This floating design ensures that the scraper 17 always acts on the spherical surface and follows the contour changes of the spherical surface under the action of spring force, maintaining a consistent fit.

[0078] More specifically, a fixed shaft 23 is connected inside the mounting slot 401, and a rotating block 24 is rotatably connected to the surface of the fixed shaft 23; a rotating rod 25 is fixedly connected to the inner surface of the mounting base plate 19, and the rotating rod 25 is rotatably connected to the rotating block 24.

[0079] When the sphere 3 begins to rotate, its surface generates significant friction and normal thrust with the tip of the scraper 17. This thrust overcomes the tension of the elastic element 18, pushing the entire scraper 17 backward and compressing the elastic element 18. Through the rotating connection between the rotating rod 25 and the rotating block 24, the scraper 17 does not rigidly retract but instead oscillates slightly around the center of the rotating rod 25. This oscillating motion allows the tip of the scraper 17 to conform to the spherical contour of the sphere 3, maintaining an optimal cleaning angle and achieving dynamic adhesion.

[0080] This structure has the ability to automatically compensate for the machining tolerances of the ball 3 and the valve seat 4, as well as wear during use. Even if the ball 3 has slight ovality or surface unevenness, the scraper 17 can adaptively follow through oscillation, avoiding cleaning failure due to excessive clearance or jamming and abnormal wear of the scraper 17 due to insufficient clearance, thus greatly improving the service life and reliability of the valve.

[0081] Furthermore, compared to a fixed scraper 17 design, if a large, hard particle gets stuck between the scraper 17 and the ball 3, it can easily cause a sharp increase in operating torque, or even cause the ball 3 to jam and become unable to rotate. In this design, when encountering large particles, the scraper 17 can swing and retract to make way, and after the particle passes, it resets under the elastic force of the elastic element 18, avoiding valve jamming caused by impurities and ensuring smooth valve opening and closing and the safety of the actuator.

[0082] Since the scraper 17 is floating and not rigidly fixed, the frictional torque between it and the sphere 3 is optimized.

[0083] At the same time, the clean surface of the ball 3 also means lower rotational friction, which helps to reduce the overall operating torque of the valve and has a great effect on reducing the size of the actuator and reducing energy consumption.

[0084] It should be noted that, as Figure 9 As shown, a baffle 20 is also connected to the opening of the mounting groove 401. The surface of the baffle 20 is provided with a swing groove 21, and the scraper 17 is installed in the swing groove 21. The swing groove 21 can effectively prevent particles from entering the mounting groove 401.

[0085] When the scraper 17 swings, the swing groove 21 provides a limit to the swing amplitude of the scraper 17; when the scraper 17 swings due to the push of the ball 3 or abnormal force, its handle or root will eventually contact the side wall of the swing groove 21 and cannot continue to swing.

[0086] Without mechanical limits, if extremely large particles or abnormal operating forces are encountered, the swing angle of the scraper 17 may be too large, causing the movement of components such as the rotating rod 25 behind it to exceed the travel limit, which may lead to the mechanism jamming, the elastic element 18 being overstretched / compressed and plastically deformed, or even the component breaking.

[0087] By physically constraining the floating range of the scraper 17, motion overload is prevented, protecting the entire mechanism from accidental damage and defining the physical boundaries for safe scraper operation. A protective cover 22 is also connected between the mounting base plate 19 and the baffle 20 to seal the mounting groove 401. This protects the internal hinge mechanism and elastic elements, ensuring the long-term reliability of the floating mechanism and greatly reducing the failure rate caused by impurities.

[0088] It is worth noting that, such as Figure 11 As shown, a hydraulic damping mechanism is also connected to the rotating block 24. By utilizing the resistance generated by throttling, it provides bidirectional buffering and damping for the swing of the scraper 17, effectively suppressing vibration and impact, and ensuring the smoothness of the cleaning action.

[0089] The hydraulic damping mechanism includes a connecting rod 26 connected to the surface of the rotating rod 25. One end of the connecting rod 26 extends through a groove 27 provided on the surface of the rotating block 24, and the outer end of the connecting rod 26 is arc-shaped and coaxially distributed with the rotating rod 25. A first piston block 28 is connected to the end of the arc segment of the connecting rod 26. The hydraulic damping mechanism also includes a sleeve 29 connected to the surface of the rotating block 24, and the first piston block 28 is slidably installed in the arc-shaped segment of the sleeve 29.

[0090] When the scraper 17 swings, it rotates within the rotating block 24 via the connecting rod 25, which in turn controls the displacement of the first piston block 28 within the sleeve 29 via the connecting rod 26. The sleeve 29 is filled with a medium, such as hydraulic oil. Regardless of which direction the first piston block 28 slides within the sleeve 29, it will create resistance to the flow of the medium, thereby damping and buffering the swinging process of the scraper 17.

[0091] The sleeve 29 is internally connected to a partition 30, which divides the sleeve 29 into a first chamber 31 and a second chamber 32. A first piston block 28 is slidably installed in the first chamber 31, and a second piston block 34 is slidably installed inside the second chamber 32. Meanwhile, the surface of the partition 30 is provided with a throttling hole 33, and the first chamber 31 and the second chamber 32 are connected through the throttling hole 33.

[0092] When the rotating rod 25 rotates clockwise, it drives the first piston block 28 to slide into the sleeve 29 via the connecting rod 26, compressing the volume of the first chamber 31. The medium in the first chamber 31 is squeezed by the first piston block 28, and the pressure rises sharply.

[0093] Since the second chamber 32 is closed and the first piston block 28 seals the first chamber 31, the only way out for the compressed medium is to flow into the second chamber 32 through the throttle orifice 33. By quickly squeezing the medium in the first chamber 31 through a very small throttle orifice 33, the medium is quickly squeezed through the throttle orifice 33, generating resistance. This generates a pressure in the first chamber 31 that resists the movement of the first piston block 28. This resistance is transmitted back to the rotating rod 25, which manifests as a damping force on the clockwise rotation of the rotating rod 25.

[0094] When the rotating rod 25 rotates counterclockwise, it drives the first piston block 28 to slide out of the sleeve 29, and the volume of the first chamber 31 expands, generating local low pressure.

[0095] In order to fill the space created by the expansion of the first chamber 31, the medium needs to flow back from the second chamber 32 to the B chamber.

[0096] Similarly, the medium must flow from the second chamber 32 into the first chamber 31 through the throttle orifice 33. This process is equivalent to trying to quickly draw the medium from the first chamber 31 through a very small throttle orifice 33, thereby creating a pressure difference between the second chamber 32 and the first chamber 31, generating a suction force that resists the movement of the first piston block 28. This resistance is transmitted back to the rotating rod 25, which manifests as a damping force on the counterclockwise rotation of the rotating rod 25.

[0097] The throttling effect of the throttling orifice 33 converts the rapid and impactful mechanical kinetic energy into heat energy and dissipates it, significantly reducing the high-frequency vibration and instantaneous impact of the scraper 17, preventing the mechanism from being damaged by violent shaking or collision, and making the scraper's movement smoother.

[0098] Meanwhile, the stable damping force ensures that the scraper 17 can retreat smoothly when it encounters an obstacle and return to its original position smoothly after the resistance disappears. This fundamentally prevents movement jamming and abnormal wear, and extends the service life of the valve under ultra-high pressure conditions. The second piston block 34 ensures that the hydraulic damping medium can flow smoothly and predictably between the first chamber 31 and the second chamber 32, thereby ensuring the bidirectional stability and reliability of the damping effect.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-pressure metal-sealed fixed ball valve, characterized in that, The valve includes a valve body (1), a valve cover (2), a ball (3), a valve seat (4), and a valve stem (5). The valve body (1) has a central cavity (101) and a channel (102) inside. The valve seat (4) is installed inside the valve body (1) and cooperates with the sealing surface of the ball (3). A scraper (17) is provided on the surface of the valve seat (4) facing the ball (3). The scraper (17) is connected to the valve seat (4) through a floating mechanism. When the scraper (17) rotates on the ball (3), the floating mechanism always elastically fits the surface of the ball (3) and can perform adaptive swinging. The floating mechanism is also connected to a hydraulic damping mechanism for providing bidirectional damping force to the swing of the scraper (17); The valve seat (4) has a mounting groove (401) on its surface. The floating mechanism includes a mounting base plate (19) and a hinge assembly disposed between the mounting base plate (19) and the scraper (17). The mounting base plate (19) is elastically slidably disposed in the mounting groove (401). The scraper (17) is connected to the mounting base plate (19) through the hinge assembly. The hinge assembly includes a fixed shaft (23) fixed in the mounting groove (401) and a rotating block (24) rotatably sleeved on the fixed shaft (23). The mounting base plate (19) is provided with a rotating rod (25) rotatably connected to the rotating block (24). The hydraulic damping mechanism includes a connecting rod (26) connected at one end to the rotating rod (25) and a sleeve (29) fixed on the rotating block (24). The sleeve (29) has an inner cavity and the inner cavity is divided into a first chamber (31) and a second chamber (32) by a partition (30). The partition (30) has a throttling orifice (33) that connects the first chamber (31) and the second chamber (32). The inner cavity of the sleeve (29) is slidably provided with a first piston block (28) connected to the other end of the connecting rod (26). The hydraulic damping mechanism further includes a second piston block (34) that is slidably disposed in the second chamber (32). A baffle (20) is provided at the opening of the mounting groove (401), and a swing groove (21) is provided on the baffle (20) for the scraper (17) to pass through and swing. A protective cover (22) with a sealing mounting groove (401) is provided between the mounting base plate (19) and the baffle (20).

2. The ultra-high pressure metal-sealed fixed ball valve according to claim 1, characterized in that, The valve seat (4) has an elastic groove (104) at its head to improve its elastic compensation capability.

3. The ultra-high pressure metal-sealed fixed ball valve according to claim 1, characterized in that, The valve cover (2) is provided with a stuffing box (103) on top, the valve stem (5) passes through the stuffing box (103), and a stuffing assembly with preload provided by a disc spring (10) is provided inside the stuffing box (103).

4. The ultra-high pressure metal-sealed fixed ball valve according to claim 1, characterized in that, An antistatic device (15) is provided between the valve stem (5) and the valve cover (2), a first sliding bearing (14) is provided between the valve stem (5) and the valve cover (2), and a second sliding bearing (16) is provided between the ball (3) and the valve body (1) and the valve cover (2).

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