High-wear-resistance high-sealing nickel-based ceramic valve

Abstract

The application discloses a kind of high wear-resistant high sealing nickel-based ceramic valves, belong to valve technical field, it includes first valve body, side valve body, second valve body and differential screw drive mechanism, second valve body installs arc valve in, drive mechanism is by guide sliding sleeve, valve stem, arc-shaped cooperation body is formed, reset piece is equipped between side valve body and arc-shaped cooperation body, limit piece is arranged in side valve body, and the stroke of arc-shaped cooperation body is limited, valve body main component is made of nickel-based alloy, and the contact surface of arc valve and arc-shaped cooperation body is sprayed with specified nickel-based ceramic wear-resistant coating.The application realizes ball valve rotation opening and closing and reset by differential screw structure, relies on reset piece to realize that sealing surface is closely attached to form dynamic seal, can clean sealing surface impurities in opening and closing process, avoid solid particle accumulation to cause sealing damage, simultaneously rely on limiting structure to guarantee component stable operation.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a high-wear-resistant, high-sealing nickel-based ceramic valve. Background Technology

[0002] Arc valves, with their excellent wear and corrosion resistance, are widely used in harsh operating conditions containing solid particles, such as power plant desulfurization, coal chemical industry, and mining slurry. However, existing arc valves commonly suffer from technical defects in actual use, including difficulty in opening and closing, and even complete jamming, which seriously affects the reliability of valve operation. The mechanism of this defect is as follows: when the valve is closed, hard, tiny particles in the medium can easily penetrate into the microscopic gap between the ball sealing surface and the valve seat sealing surface. Under the coupling effect of medium pressure and mechanical closing force, the hard particles are wedged between the sealing surfaces, forming a large static friction force. When the valve is reopened, the torque output by the actuator is insufficient to overcome this static friction force, further aggravating the particle wedging effect, ultimately causing the valve to fail to open, the valve stem to break, and the sealing surface to be scratched and damaged, significantly reducing the service life of the valve and causing safety hazards in the operating conditions.

[0003] Meanwhile, traditional arc valves mostly employ rigid seat sealing structures, lacking effective dynamic cleaning mechanisms for the sealing surface. Solid particles tend to accumulate continuously between the sealing surfaces, exacerbating wear. Ball valves lack elastic support structures at the bottom, making the ball prone to skew due to its own weight and media impact, further leading to opening / closing jamming and sealing failure. Conventional drive mechanisms have a single transmission form, with unsmooth conversion between axial and rotary motion, resulting in high opening / closing torque and poor transmission stability. Furthermore, the materials of the valve body and transmission components have poor compatibility with the thermal expansion coefficients of the ceramic ball, easily leading to gap changes, component deformation, and cracking under high-temperature and high-pressure conditions, making it difficult to maintain long-term stable operation in complex industrial environments containing particles, strong corrosion, and high temperatures and pressures. Therefore, this paper proposes a high-wear-resistant, high-sealing nickel-based ceramic valve that effectively prevents particle wedging, achieves self-cleaning of the sealing surface, ensures smooth and unobstructed opening / closing, provides reliable sealing, and has a long service life. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high wear-resistant and high-sealing nickel-based ceramic valve. This valve adopts a design that combines a nested double valve body structure with a differential screw drive mechanism, along with a nickel-based ceramic wear-resistant coating and an automatic cleaning sealing structure. This effectively solves the technical problems of traditional valves being prone to wear, leakage, and short service life under harsh working conditions.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: A high wear-resistant and high-sealing nickel-based ceramic valve includes a first valve body and side valve bodies that are sealed and connected to both sides of the main valve body. A second valve body is disposed within the first valve body. A differential screw drive mechanism is provided between the first valve body, the second valve body, and the side valve bodies. The differential screw drive mechanism is configured to drive the arc-shaped valve in the second valve body to rotate, open, close, and reset.

[0006] The differential screw drive mechanism includes a guide sleeve and a valve stem coaxially sleeved inside the guide sleeve. A drive block is fixedly provided on the outer circumferential surface of the valve stem. The transmission end of the arc valve is connected to a groove bushing. The groove bushing has a spiral groove adapted to the drive block. When the valve stem is configured to move axially, the axial motion is converted into rotational motion through the cooperation of the drive block and the spiral groove, so as to drive the arc valve to achieve rotary opening and closing.

[0007] The bottom of the arc valve is provided with an elastic support assembly. The elastic support assembly includes a mounting groove formed on the bottom end face of the arc valve. A support rod is fixedly connected in the mounting groove. One end of the support rod is connected to a support spring. The other end of the support spring abuts against a support bushing. The lower end of the support bushing can extend into the shaft seats correspondingly provided at the bottom of the first valve body and the second valve body, so as to provide axial floating support for the arc valve when the valve stem drives the arc valve to rotate to open and close.

[0008] The differential screw drive mechanism further includes two sets of arc-shaped mating bodies. The two sets of arc-shaped mating bodies are respectively disposed on both sides of the second valve body and correspond to the sealing surface of the arc-shaped valve. The arc-shaped mating bodies can make close contact with the sealing surface of the arc-shaped valve to achieve fluid sealing.

[0009] The side valve body has a reset groove on its end face facing the arc-shaped fitting body, and the arc-shaped fitting body has a reset member on its end face facing the side valve body. At least a portion of the reset member can extend into the reset groove. The reset member is configured to apply a force toward the arc-shaped valve to the arc-shaped fitting body, driving the arc-shaped fitting body to fit tightly against the surface of the arc-shaped valve, thereby achieving a dynamic seal between the arc-shaped fitting body and the arc-shaped valve.

[0010] The inner wall of the side valve body is provided with a limiting member. When the valve is in a stationary state, a first gap is provided between the limiting member and the end face of the arc-shaped mating body along the medium flow direction. The axial length of the first gap is greater than the maximum working value of the second gap between the second valve body and the arc-shaped valve, and less than the axial effective contact width of the sealing surface between the arc-shaped valve and the second valve body.

[0011] The end face of the arc-shaped fitting body facing the arc-shaped valve is provided with an arc-shaped sealing surface that matches the curvature of the outer spherical surface of the arc-shaped valve.

[0012] The reset component is any one of a compression spring, a disc spring, an elastic rubber pad, or a magnetostrictive reset assembly. One end of the reset component abuts against the side valve body, and the other end is connected to the arc-shaped mating body. It is configured to drive the arc-shaped valve to reset to the initial sealing position after the valve opening and closing action is completed.

[0013] An annular groove is provided on the outer ring of the end face where the first valve body connects to the flange. The annular groove is used to install an edge ring. A concave sealing ring mounting groove is provided on the first valve body near the medium flow channel. A sealing ring is installed in the sealing ring mounting groove so that a seal is formed after the first valve body and the flange are installed.

[0014] The valve stem extends out of the main valve body and is connected to a pneumatically driven cylinder.

[0015] Compared with the prior art, the present invention has the following advantages: This invention addresses the shortcomings of existing arc valves in particulate media conditions, such as particle wedging, jamming during opening and closing, excessive torque, scratching of the sealing surface, and unstable operation. It incorporates structural innovation and optimization, offering significant technical advantages: The invention employs an upper and lower limit structure combined with a differential spiral inclined plane transmission, enabling the valve opening and closing to follow a specific timing sequence: first, a slight axial micro-motion to break the seal; then, water flow to flush away impurities; and finally, rotational opening and closing. By controlling the slight axial displacement of the ball valve, the sealing pair is instantaneously separated without affecting the overall assembly structure, breaking the static friction lock caused by particle wedging. The system relies on the flushing of the medium water flow to thoroughly remove hard particles embedded in the sealing surface, preventing valve jamming, valve stem breakage, and sealing surface damage. The two side reset components continuously provide a balanced preload towards the center, which, together with the bottom elastic floating support component, keeps the arc valve in a centered and stable state, effectively preventing jamming and local wear caused by ball misalignment and uneven force, ensuring smooth and stable opening and closing. During the valve opening and closing process, the arc-shaped mating body and the ceramic ball surface continuously slide in contact, which can dynamically clean the sealing surface in real time, prevent particle accumulation and blockage, and ensure long-term sealing performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall invention.

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

[0018] Figure 3 This is the book Figure 2 Enlarged view of area A.

[0019] Figure 4 This is the book Figure 2 Enlarged view of area B.

[0020] Figure 5 This is a schematic diagram of the arc-shaped mating body of the present invention.

[0021] Figure 6 This is a schematic diagram of the arc-shaped valve and valve stem assembly of the present invention.

[0022] Figure 7 This is the book Figure 6 Enlarged view of area B.

[0023] Figure 8 This is a schematic diagram of the explosion of the present invention.

[0024] Figure 9 This is an enlarged schematic diagram of region C of the present invention.

[0025] Figure 10 This is a schematic diagram of the pneumatic drive cylinder connection of the present invention.

[0026] The following are the labeling symbols in the diagram: 1. First valve body; 2. Side valve body; 3. Second valve body; 4. Arc valve; 5. Guide sleeve; 6. Valve stem; 7. Arc mating body; 8. Reset groove; 9. Reset component; 10. Limiting component; 11. First gap; 12. Second gap; 13. Arc sealing surface; 14. Pneumatic drive cylinder; 15. Drive block; 16. Spiral groove; 17. Mounting groove; 18. Support rod; 19. Support spring; 20. Support bushing; 21. Shaft seat; 22. Groove bushing; 23. Flange; 24. Annular side groove; 25. Edge ring; 26. Sealing ring mounting groove; 27. Sealing ring. Detailed Implementation

[0027] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example 1

[0028] like Figure 1-9As shown, the high wear-resistant and high-sealing nickel-based ceramic valve disclosed in this invention comprises a first valve body 1 and two side valve bodies 2 that are tightly connected to the left and right end faces of the first valve body 1 through a sealing structure. A second valve body 3 is nested within the internal medium flow channel of the first valve body 1. A differential screw drive mechanism is integrated into the assembly area between the first valve body 1, the second valve body 3, and the two side valve bodies 2. This differential screw drive mechanism, as the core power transmission and execution unit of the valve, is configured to have bidirectional synchronous drive function. On the one hand, it can convert the externally input rotational power into a stable and controllable torque output through transmission, thereby driving the arc-shaped valve 4 installed in the sealed chamber inside the second valve body 3 to perform a fixed-angle rotational movement, thus achieving… The valve features multi-state control, including opening, flow regulation, and complete closure of the internal medium flow channel. Furthermore, when external power input is interrupted or a reset command is received, the arc valve 4 can be rotated in the reverse direction to its initial fully open or fully closed position to complete the reset action, utilizing its own transmission characteristics and built-in reset auxiliary components. The design scheme, combining a nested double valve body structure with a differential screw drive mechanism, significantly simplifies the internal transmission chain structure of the valve, reduces frictional losses and clearance errors between transmission components, and effectively improves the response speed and control accuracy of the valve's opening and closing actions. Simultaneously, the self-locking characteristic of the differential screw drive ensures that the arc valve 4 maintains a stable position at any opening and closing angle, avoiding ball valve displacement and sealing failure caused by medium pressure fluctuations.

[0029] The differential screw drive mechanism consists of a guide sleeve 5 and a valve stem 6 coaxially mounted inside the guide sleeve 5, forming an integral guide transmission base. A drive block 15 is integrally fixed to the outer wall of the valve stem 6. A grooved bushing 22 is connected to the transmission end of the arc-shaped valve 4. The grooved bushing 22 is detachably mounted inside the valve ball 4 by radial locking with headless bolts and axial fixing with screws. This detachable connection method, combining radial locking with headless bolts and axial fixing with screws, facilitates individual replacement of the grooved bushing 22, allows for adjustable clearance, and provides vibration and anti-loosening protection. It also avoids pressure stress on the ceramic valve ball 4, significantly reducing maintenance costs and processing difficulty. The grooved bushing 22 has an opening that matches the outer shape of the drive block 15. The spiral groove 16, which matches the motion trajectory, is assembled as a whole. The drive block 15 is slidably engaged inside the spiral groove 16 to form a linkage transmission pair. The guide sleeve 5 can coaxially limit and guide the valve stem 6 throughout its entire movement, preventing the valve stem 6 from swaying or deviating during operation. This ensures that the valve stem 6 can only make stable axial linear movements. When the valve stem 6 moves axially forward or backward under the action of external force, the inclined surface pressing and sliding cooperation between the drive block 15 and the spiral groove 16 can efficiently convert the linear reciprocating motion of the valve stem 6 into the circumferential rotation motion of the arc valve 4, thereby driving the arc valve 4 to complete the angle rotation and smoothly realize the opening, closing and opening degree adjustment operations of the valve.

[0030] The bottom of the arc-shaped valve 4 is equipped with an elastic support assembly. This assembly consists of a mounting groove 17 at the bottom of the arc-shaped valve 4, a support rod 18 fixed inside the groove, a support spring 19, and a support bushing 20. The upper end of the support rod 18 is firmly fixed in the mounting groove 17, and the lower end is connected to one end of the support spring 19. The other end of the support spring 19 abuts against the upper surface of the support bushing 20. The lower end of the support bushing 20 can be movably inserted into the shaft seat 21 aligned with the bottom of the first valve body 1 and the second valve body 3 to complete the alignment and assembly, forming an adaptive floating structure. The bottom support structure provides a stable and reliable axial elastic floating support force for the arc valve 4 throughout the entire process of the valve stem 6 driving the arc valve 4 to complete the rotational opening and closing action. This effectively supports the arc valve 4 to balance its own weight and the impact force of the medium fluid, preventing the arc valve 4 from falling, shifting, or tilting due to unilateral force. At the same time, with the elastic extension and contraction characteristics of the support spring 19, it can adapt to the small axial displacement generated during the rotation of the arc valve 4, automatically buffering the vibration and impact generated during operation, and reducing the hard squeezing friction between the arc valve 4 and the surrounding sealing structure. Example 2

[0031] Based on Embodiment 1, this embodiment further integrates two sets of arc-shaped mating bodies 7 into the differential screw drive mechanism. These two sets of arc-shaped mating bodies 7 are symmetrically embedded at the left and right ports of the medium flow channel inside the second valve body 3. Their sealing end faces maintain coaxiality and positional correspondence with the spherical sealing surfaces on both sides of the arc valve 4. The arc-shaped mating bodies 7 are integrally sintered from a high-wear-resistant nickel-based ceramic composite material compatible with the material of the arc valve 4. Their function is to form a tight, surface-to-surface contact with the spherical sealing surface of the arc valve 4 when the arc valve 4 is rotated to the fully closed position, constructing a double, independent, and redundant fluid sealing barrier to block the flow path of the medium inside the valve and prevent internal leakage. Simultaneously, throughout the entire opening and closing rotation process of the arc valve 4, the arc-shaped mating bodies 7 maintain a uniform and stable preset contact pressure with the sealing surface of the arc valve 4. This prevents excessive contact pressure from causing a sharp increase in the rotational resistance of the arc valve 4, thus avoiding additional transmission load on the differential screw drive mechanism, and also prevents gap leakage due to insufficient contact pressure. Example 3

[0032] Based on Embodiment 2, this embodiment provides a reset groove 8 on the end face of the side valve body 2 facing the arc-shaped mating body 7, corresponding to the position of the arc-shaped mating body 7. The reset groove 8 has a groove structure adapted to the installation of the reset component 9, which can provide installation space and movement stroke for the reset component 9. Correspondingly, a reset component 9 is integrally fixed or detachably installed on the end face of the arc-shaped mating body 7 facing the side valve body 2. The reset component 9 is made of wear-resistant and high-temperature resistant elastic components with good elastic reset performance. At least a part of its structure can be adapted to extend into the reset groove 8 of the side valve body 2, and can perform a certain range of extension and retraction within the reset groove 8. The core function of the reset component 9 is to continuously apply a constant elastic force towards the arc-shaped valve 4 to the arc-shaped mating body 7. This force can always push the arc-shaped mating body 7 towards the arc-shaped valve 4, ensuring that the sealing end face of the arc-shaped mating body 7 and the spherical sealing surface of the arc-shaped valve 4 remain in close contact. Even during the dynamic process of the arc-shaped valve 4 opening, closing and rotating, or under conditions of medium pressure fluctuations and slight equipment vibration, the elastic compensation of the reset component 9 can promptly compensate for any small gaps that may appear between the sealing surfaces, effectively achieving a dynamic sealing effect between the arc-shaped mating body 7 and the arc-shaped valve 4. Example 4

[0033] Based on Embodiment 3, this embodiment provides a limiting member 10 on the inner wall of the side valve body 2, corresponding to the position of the arc-shaped mating body 7. When the valve is in a completely stationary non-working state or a stationary state after normal opening and closing, an axial first gap 11 is reserved between the limiting member 10 and the corresponding end face of the arc-shaped mating body 7 along the medium flow direction. The axial length of the first gap 11 is limited to two key value ranges after dimensional calculation and matching design. On the one hand, its axial length must be greater than the maximum working value of the second gap 12 between the second valve body 3 and the arc-shaped valve 4. On the other hand, its axial length must be less than the effective axial contact width between the sealing surfaces of the arc-shaped valve 4 and the second valve body 3. The core function of the limiting component 10 is to act as a safety limiting and stroke constraint device for the axial displacement of the arc-shaped mating body 7. It can control the maximum range of movement of the arc-shaped mating body 7 in the axial direction. When the arc-shaped mating body 7 moves towards the arc-shaped valve 4 under the elastic thrust of the reset component 9, or moves towards the side valve body 2 under the reverse pressure of the medium, its movement stroke can be effectively limited to prevent excessive displacement of the arc-shaped mating body 7. The design of the first gap 11 being larger than the maximum working value of the second gap 12 allows the arc-shaped mating body 7 to move freely in the axial direction under the action of the reset component 9 during the normal opening and closing rotation of the arc-shaped valve 4, thus timely compensating for the wear of the sealing surface and the medium pressure. The gap changes caused by fluctuations will not be blocked in advance by the limiting member 10, thus affecting the sealing effect. The design that the first gap 11 is smaller than the effective axial contact width of the sealing surface between the arc valve 4 and the second valve body 3 ensures that even under harsh conditions such as extreme high pressure impact or abnormal elasticity of the reset member 9, when the arc mating body 7 moves excessively towards the arc valve 4, the limiting member 10 can promptly hold the end face of the arc mating body 7 to prevent it from moving forward further. This avoids the arc mating body 7 from excessively squeezing the arc valve 4, preventing the effective contact width between the arc valve 4 and the sealing surface of the second valve body 3 from being completely compressed or even disappearing, thereby eliminating serious malfunctions such as jamming, stuck-in, and crushing of the sealing surface of the arc valve 4.

[0034] The end face of the arc-shaped mating body 7 facing the arc-shaped valve 4 is provided with an arc-shaped sealing surface 13 that matches the radius of curvature and curvature of the outer spherical surface of the arc-shaped valve 4. This arc-shaped sealing surface 13 forms a full-face-to-face contact with the outer spherical surface of the arc-shaped valve 4, rather than the line contact or partial point contact common in traditional valves. Its core function is to significantly increase the effective sealing contact area between the arc-shaped mating body 7 and the arc-shaped valve 4, so that the elastic force applied by the reset member 9 and the medium pressure can be evenly distributed on the entire arc-shaped sealing surface 13, forming a continuous and uninterrupted annular sealing band, blocking the leakage channel of the medium. At the same time, during the opening, closing and rotation of the arc-shaped valve 4, the arc-shaped sealing surface 13 can maintain a uniform and stable contact state with the outer spherical surface of the arc-shaped valve 4, and there will be no situation of excessively high or low local pressure. Example 5

[0035] Based on embodiments one to four, the reset component 9 can be flexibly selected from any one of compression spring, disc spring, elastic rubber pad or magnetostrictive reset assembly according to the actual working conditions of the valve. Its installation structure adopts a two-end docking design, with one end tightly abutting and fixed to the bottom end face of the reset groove 8 of the side valve body 2, and the other end firmly connected to the end face of the arc-shaped mating body 7 facing the side valve body 2, forming a stable elastic transmission link.

[0036] The core structural components of the valve in this invention include a first valve body 1, a side valve body 2, a second valve body 3 nested inside the first valve body 1, and a guide sleeve 5 and a valve stem 6 in the differential screw drive mechanism. All of them are made of nickel-based alloy material and are integrally manufactured by precision casting and machining processes. Nickel-based alloy material itself has excellent high-temperature strength, creep resistance, acid and alkali corrosion resistance and solid particle erosion resistance, which can provide solid structural support and reliable transmission foundation for the valve.

[0037] A layer of nickel-based ceramic wear-resistant composite coating is uniformly sprayed onto the entire outer spherical surface of the arc valve 4 and the arc sealing surface 13 where the arc fitting body 7 directly contacts the arc valve 4 using a supersonic flame spraying process. This coating uses a nickel-based alloy as the binder phase and hard ceramic particles such as tungsten carbide and chromium carbide as the reinforcing phase. Its thickness is strictly controlled within the optimal range of 0.2-0.5mm, and the surface roughness after precision grinding and polishing is no greater than Ra0.8μm. A metallurgical bond is formed between the coating and the metal substrate, and the bonding strength can reach more than 80MPa.

[0038] Furthermore, an annular groove 24 is machined on the outer circumferential position of the end face where the first valve body 1 connects to the flange 23. This annular groove 24 is used for aligning and assembling the edge ring 25. A concave sealing ring mounting groove 26 is provided on the inner side of the first valve body 1 near the internal medium flow channel. A sealing ring 27 is assembled and fixed inside the sealing ring mounting groove 26. The whole structure forms a double assembly and sealing structure with the outer edge ring 25 for positioning and limiting, and the inner sealing ring 27 for sealing and blocking. The edge ring 25 can realize quick alignment, circumferential limiting and assembly centering when assembling the main valve body and the flange 23, ensuring the coaxiality of the connection between the two and avoiding installation misalignment. The sealing ring 27 tightly fills the assembly gap between the main valve body and the flange 23, effectively preventing the medium from leaking out from the flange connection surface. The combination of the double structure not only improves the assembly accuracy and connection stability of the valve body and flange connection, but also strengthens the sealing reliability of the flange connection, prevents medium leakage, and is suitable for the flange sealing requirements under high pressure and strong corrosive media conditions. Example 6

[0039] like Figure 10As shown, in this embodiment, based on embodiments one to five, the power input end of the valve stem 6 extending outside the first valve body 1 is rigidly coaxially connected to the output execution end of the pneumatic drive cylinder 14 via a high-strength coupling or spline transmission structure. The pneumatic drive cylinder 14 is fixedly installed on the top end face of the first valve body 1 by a bracket, forming a complete power input and execution system with the differential screw drive mechanism. Its core function is to serve as the main external power source for the valve, efficiently converting the compressed air pressure energy provided in the industrial environment into linear reciprocating mechanical energy. Then, through the screw transmission cooperation between the valve stem 6 and the differential screw drive mechanism, the linear motion is precisely converted into the fixed-angle rotational motion of the arc valve 4, thereby quickly realizing the complete opening and closing of the internal medium flow channel of the valve, as well as the flow regulation control of any opening degree. At the same time, the pneumatic drive cylinder 14 can be equipped with auxiliary control components such as solenoid valves, electric positioners, and limit switches, easily connecting to the industrial automation control system to realize remote centralized control, automatic program control, and precise flow ratio regulation of the valve. The significant advantages of this pneumatic drive connection structure are: pneumatic drive offers fast response, reliable operation, and high output torque, greatly improving valve opening and closing efficiency and shortening the response time for medium flow; its inherently safe explosion-proof characteristics make it particularly suitable for hazardous industrial environments such as petroleum, chemical, and natural gas industries where flammable and explosive media exist, eliminating the risk of electrical sparks and accidents; compared to manual drive, it eliminates the labor intensity and human error risk of manual operation; compared to electric drive, the pneumatic drive system has a simpler and more compact structure, lower maintenance costs, lower failure rate, and can adapt to high temperatures, humidity, and dust. It can withstand harsh on-site environments; at the same time, the output torque of the pneumatically driven cylinder 14 can be flexibly and precisely adjusted by adjusting the intake pressure, which can adapt to the valve opening and closing torque requirements under different media pressures and operating conditions, ensuring that the valve can be opened and closed smoothly under high pressure differential conditions without jamming or failure to open; in addition, the design of the pneumatic drive system in conjunction with the built-in reset component 9 can automatically drive the valve to close in emergency situations such as sudden power failure or air supply interruption, cutting off the media flow, effectively preventing media leakage and safety accidents, and further improving the operational safety and reliability of the entire valve system.

[0040] The application process of the high wear-resistant and high-sealing nickel-based ceramic valve of the present invention is as follows: When the valve is normally closed and stationary, the hard micro-particles contained in the medium will penetrate into the sealing gap between the arc-shaped valve and the arc-shaped mating bodies on both sides with the fluid. Under the coupling effect of the medium pressure and the sealing pre-tightening force, they will be wedged and trapped, forming a high-strength static friction locking structure, which poses a hidden danger of jamming and damage to the sealing surface of traditional valves. When it is necessary to open the valve, the valve stem is first driven to move axially along the guide sleeve. In the initial stage of the valve stem's rotational transmission action, the drive block on the outside of the valve stem preferentially fits against the inclined surface of the spiral groove at the transmission end of the arc-shaped valve. Relying on the pushing and guiding action of the inclined surface, the arc-shaped valve is forced to make a preset small up and down movement along the axial direction. The displacement stroke is controlled by the top and bottom limiting structures. The axial micro-movement is completed only by using the reserved small gap. This action will first break the fit and sealing state between the arc-shaped valve and the arc-shaped mating bodies on both sides, completely releasing the static friction locking formed by the wedging of particles. After the sealing gap opens instantly, the medium water in the pipeline flows. It quickly rushes into the gaps of the sealing contact surface, and through the impact and flushing action of high-speed water flow, it completely peels off and washes away the hard impurity particles embedded in the sealing surface, eliminating the root cause of the jamming. After completing the sequence of breaking the seal and cleaning the particles, the valve stem continues to feed axially, and the drive block and spiral slide enter a stable transmission state, thereby driving the arc valve to rotate smoothly and open, gradually opening the medium flow channel. The entire process follows the sequence logic of first breaking the seal with axial micro-motion, then cleaning the particles with water flow, and finally rotating to open, completely avoiding the failures such as particle squeezing and embedding, valve jamming, valve stem breakage, and sealing surface scratches caused by direct rotation of traditional valves. When the valve needs to be closed, the valve stem is driven to reset in reverse, still following the exclusive timing logic. The valve stem first pushes the arc valve through the inclined surface of the drive block 15, generating a slight reverse axial displacement, which instantly breaks the sealing pair's fit. The medium water flow then cleans up the small particles and impurities that were embedded or remained during the opening and closing process, completely eliminating the risk of closure jamming. After the impurities on the sealing surface are completely cleaned, the valve stem continues to move, driving the arc valve to rotate and reset in the opposite direction until the valve is fully closed. After the valve returns to its original position, the reset parts on both sides apply a balanced squeezing force to the center again, pushing the arc-shaped mating body to re-fit tightly against the arc valve ball surface, allowing the ball valve to quickly return to a stable, centered state, rebuilding the tight sealing structure, and blocking the flow of the medium.Throughout the valve's opening and closing process, the top and bottom fixed structures consistently limit the axial micro-movement of the arc valve, ensuring that the ball valve's vertical movement distance remains a safe, minimal gap. This is used only for momentary seal breaking and particle cleaning, without affecting the overall assembly precision or sealing structure stability of the valve. The bottom elastic support component synchronously and adaptively adjusts its support state, and in conjunction with the centering and pressure stabilizing effect of the double-sided reset components, further ensures that the arc valve rotates smoothly without deviation or jamming. Combined with the protective performance of the nickel-based ceramic wear-resistant coating, this completely solves the industry pain points of arc valve jamming, seal failure, and short service life under harsh conditions containing particles, such as power plant desulfurization, coal chemical industry, and mining slurry, significantly improving the overall operational stability and reliability of the valve.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A high wear-resistant and high-sealing nickel-based ceramic valve, comprising a first valve body (1) and side valve bodies (2) sealed and connected to both sides of the first valve body (1), characterized in that, A second valve body (3) is provided inside the first valve body (1). A differential screw drive mechanism is provided between the first valve body (1), the second valve body (3) and the side valve body (2). The differential screw drive mechanism is configured to drive the arc valve (4) inside the second valve body (3) to rotate, open, close and reset.

2. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 1, characterized in that, The differential screw drive mechanism includes a guide sleeve (5) and a valve stem (6) coaxially sleeved inside the guide sleeve (5). A drive block (15) is fixedly provided on the outer circumferential surface of the valve stem (6). The transmission end of the arc valve (4) is connected to a groove bushing (22). The groove bushing (22) has a spiral groove (16) adapted to the drive block (15). The valve stem (6) is configured to convert axial movement into rotational movement through the cooperation of the drive block (15) and the spiral groove (16) when it moves axially, so as to drive the arc valve (4) to achieve rotational opening and closing.

3. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 2, characterized in that, The bottom of the arc valve is provided with an elastic support assembly. The elastic support assembly includes a mounting groove (17) opened on the bottom end face of the arc valve (4). A support rod (18) is fixedly connected in the mounting groove (17). One end of the support rod (18) is connected to a support spring (19). The other end of the support spring (19) abuts against a support bushing (20). The lower end of the support bushing (20) can extend into the shaft seat (21) correspondingly provided at the bottom of the first valve body (1) and the second valve body (3), so as to provide axial floating support for the arc valve (4) when the valve stem (6) drives the arc valve (4) to rotate to open and close.

4. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 2, characterized in that, The differential screw drive mechanism also includes two sets of arc-shaped mating bodies (7). The two sets of arc-shaped mating bodies (7) are respectively arranged on both sides inside the second valve body (3) and correspond to the sealing surface of the arc-shaped valve (4). The arc-shaped mating bodies (7) can be in close contact with the sealing surface of the arc-shaped valve (4) to achieve fluid sealing.

5. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 4, characterized in that, The side valve body (2) has a reset groove (8) on the end face facing the arc-shaped fitting body (7). The arc-shaped fitting body (7) has a reset member (9) on the end face facing the side valve body (2). At least part of the structure of the reset member (9) can extend into the reset groove (8). The reset member (9) is configured to apply a force toward the arc-shaped valve (4) to the arc-shaped fitting body (7), driving the surface of the arc-shaped fitting body (7) to fit tightly with the surface of the arc-shaped valve (4), thereby achieving a dynamic seal between the arc-shaped fitting body (7) and the arc-shaped valve (4).

6. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 5, characterized in that, The inner wall of the side valve body (2) is provided with a limiting member (10). When the valve is in a static state, a first gap (11) is provided between the limiting member (10) and the end face of the arc-shaped mating body (7) along the medium flow direction. The axial length of the first gap (11) is greater than the maximum working value of the second gap (12) between the second valve body (3) and the arc-shaped valve (4).

7. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 4, characterized in that, The arc-shaped mating body (7) has an arc-shaped sealing surface (13) on its end face facing the arc-shaped valve (4) that matches the curvature of the outer spherical surface of the arc-shaped valve (4).

8. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 5, characterized in that, The reset component (9) is any one of a compression spring, a disc spring, an elastic rubber pad, or a magnetostrictive reset assembly. One end of the reset component (9) abuts against the side valve body (2), and the other end is connected to the arc-shaped mating body (7). It is configured to drive the arc-shaped valve (4) to reset to the initial sealing position after the valve opening and closing action is completed.

9. The high wear-resistant and high-sealing nickel-based ceramic valve according to claim 1, characterized in that, An annular groove (24) is provided on the outer ring of the end face where the first valve body (1) connects to the flange (23). The annular groove (24) is used to install an edge ring (25). A recessed sealing ring mounting groove (26) is provided on the first valve body (1) near the medium flow channel. A sealing ring (27) is installed in the sealing ring mounting groove (26) so that a seal is formed after the first valve body (1) and the flange (23) are installed.

10. A pneumatic arc valve, characterized in that, The high wear-resistant and high-sealing nickel-based ceramic valve according to any one of claims 1-9 is provided, wherein the valve stem (6) is connected to a pneumatically driven cylinder (14) at one end extending out of the first valve body (1).

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