High-tolerance metal gate valve

Abstract

The invention relates to the field of fluid control, in particular to a high-tolerance metal gate valve which comprises a valve box, a first valve port and a second valve port which are coaxial are formed in the valve box, a guide rod is arranged in the valve box, a sliding seat is arranged on the guide rod, the two sides of the sliding seat are connected with a first valve plate and a second valve plate through elastic pieces respectively, and the first valve plate is provided with a metal sealing ring. The second valve plate is provided with a metal abutting ring, an extrusion plate is arranged between the first valve plate and the second valve plate, a deflection mechanism is arranged between the extrusion plate and the valve plates, and the extrusion plate is connected with a driving mechanism so that the gate valve can be in a synchronous moving and extrusion sealing state. An over-dead-point self-locking structure, a limiting structure and the like are also arranged; the metal sealing ring and the like are specially designed, and the elastic piece is an arc-shaped elastic plate and the like. The gate valve achieves the technical effects that stable and reliable extrusion sealing is achieved, it is guaranteed that the gate valve works normally in different states, and the tolerance and the sealing performance of the gate valve are improved.

Description

Technical Field

[0001] This application relates to the field of fluid control, and in particular to a highly durable metal slide gate valve. Background Technology

[0002] In high-precision fields such as semiconductor manufacturing, high-energy physics, nuclear industry, and aerospace, process chambers are often in extreme environments such as ultra-high vacuum, extremely high temperature, or strong radiation. Under these conditions, traditional rubber sealing materials will age, leak gas, or become embrittled by radiation and are no longer suitable. Therefore, all-metal sealed gate valves must be used. In order to achieve strict leakage rate indicators, all-metal sealed gate valves need to apply extremely high sealing pressure to the metal sealing ring. This requires the drive mechanism inside the valve plate to not only be able to drive the valve plate to perform long-stroke opening and closing movements, but also to provide huge lateral opening force in the closed position.

[0003] Currently, the existing internal drive mechanisms of metal slide gate valves mainly have the following two mainstream technical solutions and their inherent technical defects: The first type is the steel ball inclined plane drive structure. This structure uses a steel ball rolling on a conical track or inclined plane to convert longitudinal thrust into lateral spreading force. However, the contact between the steel ball and the track is a typical point contact. Under the huge thrust required to build a metal hard seal, the Hertzian contact stress at the contact point between the steel ball and the track is extremely high. This high stress state, if it persists for a long time, can easily lead to local plastic deformation or metal peeling on the track surface, resulting in valve jamming and loss of accuracy. Moreover, the generated metal particles can seriously contaminate the clean vacuum chamber, resulting in poor overall valve durability and limited lifespan. The second type is the wedge block. The wedge block structure relies on large-area sliding friction for compression. The frictional resistance is high, and it is very easy for metal cold welding to occur in a vacuum environment, causing jamming.

[0004] In summary, designing a drive mechanism that can avoid high stress wear caused by point contact, simplify the internal structure, and provide stable and reliable high-load lateral opening force is a technical problem that urgently needs to be solved in the field of metal slide gate valves. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a highly durable metal slide gate valve that can achieve stable synchronous movement and reliable compression sealing, ensuring normal operation of the slide gate valve under different conditions and improving the valve's durability and sealing performance.

[0006] This application is achieved through the following technical solution: A high-resistance metal slide gate valve includes a valve box with a first valve port and a second valve port coaxially arranged on the valve box. A guide rod perpendicular to the axes of the first and second valve ports is provided in the valve box. A slide block is slidably connected to the guide rod. A first valve plate is connected to the side of the slide block near the first valve port via a first elastic element, and a second valve plate is connected to the side of the slide block near the second valve port via a second elastic element. A metal sealing ring is provided on the side of the first valve plate opposite to the slide block, and a metal abutment ring is provided on the side of the second valve plate opposite to the slide block. A pressing plate is provided between the first and second valve plates, and offsets are provided between the pressing plate and the first valve plate, and between the pressing plate and the second valve plate. The valve has a rotating mechanism, and the extrusion plate is connected to a driving mechanism. The driving mechanism is used to drive the extrusion plate to move along the guide rod so that the slide valve has a synchronous movement state and an extrusion sealing state. In the synchronous movement state, the extrusion plate drives the first valve plate, the second valve plate, and the slide block to move synchronously along the guide rod to the space between the first valve port and the second valve port through the deflection mechanism. In the extrusion sealing state, the slide block is blocked and its movement is restricted. The extrusion plate continues to move and generates displacement relative to the slide block, driving the deflection mechanism to generate a deflection action, thereby opening the first valve plate and the second valve plate, so that the metal sealing ring forms a sealing fit with the first valve port, and the metal abutment ring forms a supporting abutment with the second valve port.

[0007] By adopting the above technical solution, the deflection mechanism of this high-resistance metal slide gate valve has significant beneficial effects. In the synchronous movement state, the extrusion plate can drive the first valve plate, the second valve plate, and the slide block to move synchronously along the guide rod to between the first and second valve ports through the deflection mechanism, ensuring that the valve plates accurately reach the working position. In the extrusion sealing state, the extrusion plate continues to move and displaces relative to the slide block, driving the deflection mechanism to produce a deflection action, thereby opening the first and second valve plates, so that the metal sealing ring forms a sealing fit with the first valve port, and the metal abutment ring forms a supporting abutment with the second valve port, achieving good sealing and support. Effects: This design cleverly utilizes the characteristics of the deflection mechanism to convert the linear motion of the extrusion plate into the opening action of the valve plate, avoiding high stress wear caused by point contact, simplifying the internal structure, and providing a stable and reliable high-load lateral opening force, thus improving the reliability and stability of the seal. At the same time, the deflection mechanism can also buffer and disperse pressure to a certain extent, reducing wear on the valve plate and valve port, extending the service life of the slide gate valve, and the metal abutment ring provides rigid support to ensure that the pressure applied to the metal sealing ring is not lost due to elastic deformation, ensuring that the maximum specific pressure energy required for the metal hard seal can be effectively established, and also providing auxiliary sealing.

[0008] Optionally, the deflection mechanism has an over-dead-point self-locking position; when the compression sealing state is in which the metal sealing ring presses against the first valve port, the deflection mechanism passes the over-dead-point self-locking position and drives the compression plate to abut against the mechanical stop, so that after the driving mechanism removes the thrust, the deflection mechanism can maintain the locked state by utilizing the reverse elastic restoring force generated by the pressure on the metal sealing ring and the metal abutment ring.

[0009] By adopting the above technical solution, the deflection mechanism's over-dead-point self-locking position greatly improves the sealing reliability of the slide gate valve. In the compression sealing state, when the metal sealing ring is pressed against the first valve port, the deflection mechanism passes the over-dead-point self-locking position and abuts against the mechanical stop, a very ingenious design. When the drive mechanism removes its thrust, the metal sealing ring and metal abutment ring, under pressure, generate a reverse elastic restoring force, which the deflection mechanism utilizes to maintain the locked state. This means that even if the drive mechanism no longer provides thrust, the slide gate valve can still maintain a good sealing effect, preventing media leakage. In some industrial scenarios with extremely high sealing requirements, such as chemical and energy fields, this over-dead-point self-locking design can effectively ensure the safety and stability of production, reduce safety hazards and economic losses caused by leakage, improve the overall performance and practicality of the slide gate valve, and reduce energy consumption.

[0010] Optionally, the deflection mechanism includes several parallel deflection blocks, the two ends of which are respectively pivotally engaged between the first valve plate and the extrusion plate, and between the second valve plate and the extrusion plate; the inner surfaces of the first valve plate, the second valve plate, and the extrusion plate are all provided with abutment grooves that mate with the ends of the deflection blocks; the bottom of the abutment groove has a connected inclined surface and a transverse surface, and the connection between the inclined surface and the transverse surface forms a protruding deflection fulcrum; the end of the deflection block abuts against the deflection fulcrum to form a swing engagement; the slide is provided with a limiting protrusion that serves as the mechanical stop; when the deflection block swings from the inclined surface to the transverse surface and abuts against the limiting protrusion, the over-dead-point self-locking position is formed.

[0011] By adopting the above technical solution, when the drive mechanism drives the extrusion plate to move synchronously along the guide rod, the deflection block is obliquely engaged in the limited space enclosed by the oblique surface and the groove wall under the action of the first elastic element or the second elastic element. The extrusion plate will drive the first valve plate, the second valve plate and the slide to move synchronously along the guide rod to between the first valve port and the second valve port. When the extrusion plate continues to move and displaces relative to the slide, the slide valve enters the extrusion sealing state. Due to the continuous movement of the extrusion plate, the end of the deflection block swings around the deflection fulcrum in the abutment groove, gradually swinging from the oblique surface to the transverse surface. During this process, the deflection block opens the first valve plate and the second valve plate, so that the metal sealing ring forms a sealing fit with the first valve port, and the metal abutment ring forms a supporting abutment with the second valve port. When the deflection block swings to the transverse surface and drives the extrusion... When the plate abuts against the limiting protrusion on the slide block, it forms a self-locking position beyond the dead point. At this time, after the driving mechanism removes the thrust, the metal sealing ring and metal abutment ring are compressed and generate a reverse elastic restoring force. The limiting protrusion, as a mechanical stop, prevents the deflection block from continuing to swing, so that the deflection mechanism can maintain the locked state. This ensures the stability and reliability of the slide gate valve in the sealed state, effectively prevents the valve plate from loosening and causing sealing failure, and improves the sealing performance and durability of the slide gate valve. Compared with the steel ball or conical surface structure widely used in the prior art, the deflection block can form line contact or even surface contact with the abutment groove and the extrusion plate. When outputting the same amount of metal sealing specific pressure, the contact stress of this structure is significantly reduced, effectively avoiding local crushing and metal peeling, thereby greatly improving the valve's tolerance and service life under high load conditions.

[0012] Optionally, a limiting structure is provided inside the valve box or on the guide rod to limit the movement stroke of the slide. In the squeeze-sealed state, the slide is blocked and restricted from moving by the limiting structure, while the squeeze plate continues to move and generates displacement relative to the slide.

[0013] By adopting the above technical solution, in the compression sealing state of the high-resistance metal slide gate valve, the limiting structure provided in the valve box or on the guide rod can effectively limit the movement stroke of the slide. When the slide stops moving due to being blocked by the limiting structure, the compression plate can continue to move and generate displacement relative to the slide. This setting allows the slide gate valve to accurately control the movement of the slide and the compression plate when switching to the compression sealing state, ensuring that the deflection mechanism smoothly opens the first valve plate and the second valve plate, so that the metal sealing ring forms a sealing fit with the first valve port, and the metal abutment ring forms a supporting abutment with the second valve port, thereby improving the sealing performance and overall stability of the slide gate valve and meeting the high-resistance usage requirements.

[0014] Optionally, an adjusting plate is fixed on the inner wall of the valve box, and the end of the guide rod away from the drive mechanism is fixed to the adjusting plate; an adjusting bolt is threaded onto the adjusting plate, and the end of the adjusting bolt constitutes the limiting structure for limiting the travel of the slide.

[0015] By adopting the above technical solution, an adjusting plate is fixed to the inner wall of the valve box, and the end of the guide rod away from the drive mechanism is fixed to the adjusting plate, ensuring the stable installation of the guide rod. The adjusting bolt is threadedly connected to the adjusting plate, and its end serves as a limiting structure to restrict the movement stroke of the slide block, which plays a significant role. On the one hand, the movement stroke of the slide block can be flexibly adjusted, and the movement position of the slide block can be precisely controlled according to the actual working conditions and production needs to meet different working scenarios. On the other hand, this design facilitates equipment debugging and maintenance. When it is necessary to adjust the performance of the slide block valve, the slide block stroke can be quickly and easily changed simply by turning the adjusting bolt, thereby improving the overall efficiency and reliability of the slide block valve.

[0016] Optionally, the metal sealing ring and the metal abutment ring are arranged coaxially, and several groups of deflection blocks are arranged symmetrically with the axis of the metal sealing ring as the center.

[0017] By adopting the above technical solution, the metal sealing ring and the metal abutment ring are arranged coaxially, which makes the pressure distribution between the valve plate and the valve port more uniform and improves the sealing performance. Several sets of deflection blocks are symmetrically arranged around the axis of the metal sealing ring, which makes the force of the extrusion plate opening the first valve plate and the second valve plate more balanced, thereby making the cooperation between the metal sealing ring and the first valve port, and the metal abutment ring and the second valve port more stable and reliable, and enhancing the sealing performance and stability of the slide gate valve.

[0018] Optionally, the sealing surface of the metal sealing ring is coated with a layer of soft metal powder.

[0019] By adopting the above technical solution, coating the sealing surface of the metal sealing ring with a soft metal powder layer can significantly improve the sealing performance of the slide gate valve. The soft metal powder layer is either a silver-based powder layer or a gold-based powder layer. Silver-based and gold-based powders possess good flexibility and plasticity. When the slide gate valve is in a compression sealing state, and the metal sealing ring forms a sealing fit with the first valve port, the soft metal layer can better fill the tiny gaps between the sealing surfaces, achieving a tighter seal and reducing the possibility of media leakage. Simultaneously, the soft metal layer also provides a certain degree of lubrication, reducing friction between the metal sealing ring and the first valve port, reducing wear, and extending the service life of the sealing ring. Furthermore, silver-based and gold-based materials have good chemical stability and corrosion resistance, maintaining stable performance under various harsh operating conditions, giving the slide gate valve higher tolerance and making it suitable for a wider range of working environments.

[0020] Optionally, the first valve port is provided with a conical bevel, and the metal sealing ring is in the form of a conical structure that mates with the conical bevel. The large port of the metal sealing ring is arranged facing the first valve port so as to achieve a line seal or surface seal after abutting against the conical bevel. The first valve plate is provided with a cone. The small port of the metal sealing ring is sleeved on the cone, and the position is limited by a cover plate on the cone.

[0021] By adopting the above technical solution, the conical bevel of the first valve port cooperates with the conical metal sealing ring, with the large end of the metal sealing ring facing the first valve port. During the contact process, the conical surface can play a role in alignment. When the metal sealing ring contacts the first valve port, due to the special structure of the conical surface, even if there is a certain installation deviation or positional offset, the metal sealing ring can automatically adjust its position at the moment of contact through the guidance of the conical surface, so that the metal sealing ring is accurately aligned with the first valve port, thereby achieving a good line seal or surface seal effect. At the same time, the cone-shaped platform provided on the first valve plate, with the small end of the metal sealing ring fitted and fixed on the cone-shaped platform, ensures the stability and accuracy of the installation of the metal sealing ring. This structure not only enhances the sealing performance, but also improves the reliability and durability of the slide gate valve, reduces leakage problems caused by poor sealing, and can better adapt to various complex working environments, providing a strong guarantee for the normal operation of industrial production.

[0022] Optionally, both the first elastic element and the second elastic element are arc-shaped elastic plates; the top of the slide is provided with a slot that matches the arc-shaped elastic plate, and a positioning pin is inserted into the slot; the bottom of the arc-shaped elastic plate is fixed on the slide, and the top of the arc-shaped elastic plate is slidably connected to the positioning pin through a provided sliding hole.

[0023] By adopting the above technical solution, the first and second elastic elements are set as arc-shaped elastic plates. Utilizing the inherent elastic deformation capacity of the arc-shaped elastic plates, they can better adapt to the positional changes and stress conditions of the first and second valve plates during movement and sealing. The slot at the top of the slide block matches the arc-shaped elastic plate, and a positioning pin is inserted into the slot, allowing for accurate installation and positioning of the arc-shaped elastic plate, ensuring its installation stability. The bottom end of the arc-shaped elastic plate is fixed to the slide block, while the top end is slidably connected to the positioning pin through a sliding hole. This connection method allows the arc-shaped elastic plate to slide and deform flexibly under stress, ensuring the connection between the first and second valve plates and the slide block, and also providing buffering and elastic support during the valve plate opening and resetting process, thus improving the overall performance and service life of the slide valve.

[0024] Optionally, both the first valve plate and the second valve plate are rectangular in shape, and both the first valve plate and the second valve plate are provided with ear plates on their sides for connecting with the arc-shaped elastic plate. The slide is provided with clearance grooves to provide movement space for the ear plates.

[0025] By adopting the above technical solution, the first and second valve plates are designed as rectangular structures, which facilitates processing and manufacturing, improves production efficiency, and reduces costs. Ear plates are provided on the sides of the first and second valve plates and connected to arc-shaped elastic plates, ensuring uniform force distribution on the valve plates during movement and enhancing their stability and sealing performance. Simultaneously, clearance grooves are provided on the slide block to provide movement space for the ear plates, preventing obstruction during valve plate movement and opening, allowing for smoother opening and closing of the valve plates. This ensures a smooth transition between synchronous movement and compression sealing states, further improving the overall performance and reliability of the gate valve.

[0026] In summary, this application includes at least one of the following beneficial technical effects: This application employs a deflection mechanism to convert the longitudinal thrust of the drive mechanism into a lateral spreading force, fundamentally eliminating the easily worn mode in existing technologies. Under the same or greater metal-sealed specific pressure, it significantly reduces the local Hertzian contact stress of the transmission mechanism, effectively avoiding guide rail crushing and metal peeling dust generation problems under high-load conditions. This enables the valve to possess mechanical resilience and service life that are difficult to achieve with existing conventional technologies under extreme conditions of ultra-high vacuum and hard metal seals. This application utilizes a specific groove trajectory in conjunction with a deflection block to achieve a single component function in two ways: it can pull the valve plate in the translation section and open the valve plate in the sealing section. It also cleverly utilizes the constraint logic of the mechanical structure itself, eliminating the need for independent return springs or complex elbow linkages that are required in traditional valves to achieve sequential actions. This reduces processing and assembly costs and minimizes the number of parts and surface area inside the valve box cavity, ensuring high cleanliness inside the valve box cavity and improving the overall durability of the valve, which is not good and has a limited lifespan. This application utilizes the enormous reverse elastic restoring force of the metal sealing ring after being compressed to firmly lock the deflection mechanism onto the mechanical stop, ensuring that even when the external driving energy is cut off, it can still maintain an extremely high sealing specific pressure by relying on its own internal force, achieving zero energy consumption maintenance and fail-safe functions, and solving the technical problems of existing wedge valves that are difficult to accurately self-lock and have easy attenuation of sealing force. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the high-resistance metal slide gate valve described in Embodiment 1; Figure 2 This is a schematic diagram of the arrangement structure of the guide rod described in Embodiment 1; Figure 3 This is a schematic diagram of the internal structure of the valve box described in Embodiment 1; Figure 4 This is a schematic diagram of the arrangement structure of the extrusion plates described in Embodiment 1; Figure 5This is a schematic diagram of the internal structure of the high-resistance metal gate valve described in Embodiment 1 in the valve open state; Figure 6 This is a schematic diagram of the high-resistance metal gate valve described in Embodiment 1, showing the extrusion plate in a synchronous moving state. Figure 7 This is a schematic diagram of the deflection block's state structure in the synchronous movement state of the high-resistance metal gate valve described in Embodiment 1; Figure 8 This is a schematic diagram of the state structure of the extrusion plate in the high-resistance metal slide valve described in Embodiment 1, where the slide is blocked and movement is restricted. Figure 9 This is a schematic diagram of the state structure of the extrusion plate in the extrusion sealing state of the high-resistance metal gate valve described in Embodiment 1; Figure 10 This is a schematic diagram of the deflection block in the state of the high-resistance metal gate valve described in Embodiment 1 under the compression sealing state; Figure 11 This is a three-dimensional structural diagram of the high-resistance metal slide gate valve described in Embodiment 2; Figure 12 This is a three-dimensional structural diagram of the adjustment plate described in Embodiment 2.

[0028] In the diagram: 1. Valve box; 11. First valve port; 111. Conical bevel; 12. Second valve port; 121. Stop; 2. Guide rod; 3. Slide seat; 31. First elastic element; 32. Second elastic element; 33. First valve plate; 331. Metal sealing ring; 332. Frustum; 333. Cover plate; 34. Second valve plate; 341. Metal abutment ring; 35. Limiting protrusion; 36. Slot; 361. Positioning pin; 37. Clearance groove; 38. Fixed seat; 39. Ear plate; 4. Extrusion plate; 5. Deflection block; 6. Abutment groove; 61. Inclined surface; 62. Lateral surface; 63. Deflection fulcrum; 7. Drive mechanism; 71. Drive rod; 8. Bellows; 9. Adjusting plate; 91. Adjusting bolt. Detailed Implementation

[0029] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0030] Reference Figures 1 to 3This application discloses a high-resistance metal slide gate valve, including a valve box 1. A first valve port 11 and a second valve port 12 are formed on the valve box 1 and are arranged coaxially. A guide rod 2 is provided in the valve box 1 and is arranged perpendicular to the axis of the first valve port 11 and the second valve port 12. A slide seat 3 is slidably connected to the guide rod 2.

[0031] Reference Figures 2 to 4 The slide block 3 is connected to a first valve plate 33 via a first elastic element 31 on the side near the first valve port 11, and to a second valve plate 34 via a second elastic element 32 on the side near the second valve port 12. A metal sealing ring 331 is provided on the side of the first valve plate 33 facing away from the slide block 3, and a metal abutment ring 341 is provided on the side of the second valve plate 34 facing away from the slide block 3. A pressing plate 4 is provided between the first valve plate 33 and the second valve plate 34. Deflection mechanisms are provided between the pressing plate 4 and the first valve plate 33, and between the pressing plate 4 and the second valve plate 34. The pressing plate 4 is connected to a driving mechanism 7. The driving mechanism 7 is used to drive the pressing plate 4 to move along the guide rod 2. This allows the slide gate valve to have both a synchronous movement state and a compression sealing state. In the synchronous movement state, the compression plate 4 drives the first valve plate 33, the second valve plate 34, and the slide block 3 to move synchronously along the guide rod 2 to the space between the first valve port 11 and the second valve port 12 via the deflection mechanism. In the compression sealing state, the slide block 3 is blocked and its movement is restricted. The compression plate 4 continues to move and is displaced relative to the slide block 3, driving the deflection mechanism to deflect, thereby opening the first valve plate 33 and the second valve plate 34, so that the metal sealing ring 331 forms a sealing fit with the first valve port 11, and the metal abutment ring 341 forms a supporting abutment with the second valve port 12.

[0032] Specifically, refer to Figures 2 to 4 The drive mechanism 7 can be an electric push rod or a hydraulic push rod, etc. Its function is to drive the extrusion plate 4 to move along the guide rod 2. A bellows 8 is provided between the drive rod 71 of the drive mechanism 7 and the valve box 1 for sealing. Of course, the drive mechanism 7 can also be in the form of a linear motor, with the stator unit fixed on the inner wall of the valve box 1 and the mover unit set on the extrusion plate 4 to realize the drive of the extrusion plate 4.

[0033] Reference Figures 2 to 4The guide rod 2 is typically a cylindrical metal rod, made of high-strength and corrosion-resistant materials such as stainless steel. The guide rod 2 can be fixed to the inner wall of the valve box 1 or to a fixed seat 38 located on the inner wall of the valve box 1 using bolts or other connecting parts. Alternatively, the guide rod 2 can also be a square rod, as long as it provides stable sliding guidance for the slide block 3. The slide block 3 is a block-shaped structure with a certain thickness and an internal through-hole adapted to the guide rod 2. It slides onto the guide rod 2 through this through-hole to achieve a sliding connection. A linear bushing can also be installed in the through-hole to reduce sliding friction. The material of the slide block 3 can be the same as that of the guide rod 2 to ensure wear resistance between the two. Reinforcing ribs can also be provided on the slide block 3 to improve its structural strength.

[0034] Reference Figures 2 to 4 Both the first elastic element 31 and the second elastic element 32 are arc-shaped elastic plates. This arc-shaped design can better adapt to the movement of the valve plate while providing elastic force. The material of the arc-shaped elastic plate can be spring steel, which has good elasticity and toughness. The top of the slide block 3 is provided with a slot 36 that matches the arc-shaped elastic plate. The shape and size of the slot 36 match the end of the arc-shaped elastic plate, and a positioning pin 361 is inserted into the slot 36. The bottom end of the arc-shaped elastic plate can be fixed to the slide block 3 by bolts, and its top end is slidably connected to the positioning pin 361 through a provided sliding hole. This connection method allows the arc-shaped elastic plate to be stably installed on the slide block 3 and to generate elastic deformation when the valve plate moves.

[0035] Reference Figures 2 to 4 Both the first valve plate 33 and the second valve plate 34 are rectangular in shape, which facilitates their fit with the valve port and connection with other components. The sides of both the first valve plate 33 and the second valve plate 34 are provided with ear plates 39 for connection with the arc-shaped elastic plate. The ear plates 39 can be installed on the valve plate by welding or integral forming. The slide block 3 is provided with a clearance groove 37 to provide movement space for the ear plates 39. The size and shape of the clearance groove 37 should ensure that the ear plates 39 are not obstructed during the movement of the valve plate. The side of the first valve plate 33 away from the slide block 3 is provided with a metal sealing ring 331. The sealing surface of the metal sealing ring 331 can be coated with a soft metal layer by electroplating. The soft metal layer is a silver-based powder layer or a gold-based powder layer. This soft metal layer can achieve a better sealing effect.

[0036] Reference Figures 5 to 7The first valve port 11 is provided with a conical bevel 111, and the metal sealing ring 331 has a conical structure that matches the conical bevel 111. The large end of the metal sealing ring 331 is arranged facing the first valve port 11 to achieve line sealing or surface sealing. The first valve plate 33 is provided with a cone 332, and the small end of the metal sealing ring 331 is sleeved on the cone 332. The position is limited by the cover plate 333 at the end of the cone 332. The second valve plate 34 is provided with a metal abutment ring 341 on the side away from the slide 3. The metal abutment ring 341 can be made of spring steel. Its abutment edge with the second valve port 12 has an arc surface structure, which mainly plays the role of support and abutment. It can also adopt the same structural form and fixing method as the metal sealing ring 331 to achieve a double-layer sealing effect.

[0037] Reference Figures 5 to 7 The extrusion plate 4 is a flat structure, and its material can be the same as that of the valve plate. A deflection mechanism is provided between the extrusion plate 4 and the first valve plate 33 and between the extrusion plate 4 and the second valve plate 34. The deflection mechanism includes several parallel deflection blocks 5. The two ends of the deflection blocks 5 are respectively swingably engaged between the first valve plate 33 and the extrusion plate 4, and between the second valve plate 34 and the extrusion plate 4. The inner surfaces of the first valve plate 33, the second valve plate 34 and the extrusion plate 4 are provided with abutment grooves 6 that cooperate with the ends of the deflection blocks 5. The bottom of the abutment groove 6 has a connected inclined surface 61 and a transverse surface 62. The connection between the inclined surface 61 and the transverse surface 62 forms a protruding deflection fulcrum 63. The end of the deflection block 5 abuts against the deflection fulcrum 63 to form a swing engagement. The slide block 3 is provided with a limiting protrusion 35 as a mechanical stop. When the deflection block 5 swings from the inclined surface 61 to the transverse surface 62 and abuts against the limiting protrusion 35, it forms a self-locking position beyond the dead point. Several sets of deflection blocks 5 are symmetrically arranged around the axis of the metal sealing ring 331 to ensure uniform force when the valve plate is opened.

[0038] Reference Figures 5 to 7 When the drive mechanism 7 drives the extrusion plate 4 to move along the guide rod 2 in a synchronous movement state, the deflection block 5 is obliquely engaged in the limited space enclosed by the oblique surface 61 and the groove wall under the action of the first elastic member 31 or the second elastic member 32. The extrusion plate 4 will drive the first valve plate 33, the second valve plate 34 and the slide block 3 to move synchronously along the guide rod 2 to between the first valve port 11 and the second valve port 12.

[0039] Reference Figures 8 to 10When the slide block 3 abuts against the inner wall of the valve box 1 or the fixed seat 38 provided on the inner wall of the valve box 1, the inner wall of the valve box 1 or the fixed seat 38 provided on the inner wall of the valve box 1 acts as a limiting structure to restrict the movement of the slide block 3. When the extrusion plate 4 continues to move and displaces relative to the slide block 3, the slide valve enters the extrusion sealing state. Due to the continuous movement of the extrusion plate 4, the end of the deflection block 5 swings in the abutment groove 6 around the deflection fulcrum 63, gradually swinging from the inclined surface 61 to the transverse surface 62. During this process, the deflection block 5 opens the first valve plate 33 and the second valve plate 34. The metal sealing ring 331 forms a sealing fit with the first valve port 11, and the metal abutment ring 341 forms a supporting abutment with the second valve port 12. When the deflection block 5 swings to the transverse surface 62 and drives the extrusion plate 4 to abut against the limiting protrusion 35 on the slide block 3, it forms a self-locking position beyond the dead point. At this time, after the driving mechanism 7 removes the thrust, the metal sealing ring 331 and the metal abutment ring 341 are compressed and generate a reverse elastic restoring force. The limiting protrusion 35 acts as a mechanical stop to prevent the deflection block 5 from continuing to swing, so that the deflection mechanism can maintain the locked state.

[0040] The implementation principle of this embodiment is as follows: The high-resistance metal slide gate valve of this embodiment avoids the high stress wear problem caused by point contact in traditional drive structures through a unique structural design; by utilizing the cooperation of the extrusion plate 4 and the deflection mechanism, the longitudinal thrust of the drive mechanism 7 is converted into a lateral opening force, and the design of the deflection mechanism can ensure self-locking under the extrusion sealing state, providing a stable and reliable high-load lateral opening force; at the same time, the structure is relatively simple, reduces the vacuum outlet source, improves the overall resistance and service life of the valve, solves the technical problems in the field of existing metal slide gate valves, and has made significant improvements and contributions to the existing technology. Example 2

[0041] Reference Figures 11 to 12 The difference between this embodiment and embodiment one is that an adjusting plate 9 is fixed on the inner wall of the valve box 1. The adjusting plate 9 can be fixed to the inner wall of the valve box 1 by means of bolts, etc. The end of the guide rod 2 away from the drive mechanism 7 is fixed to the adjusting plate 9. An adjusting bolt 91 is threaded on the adjusting plate 9. The end of the adjusting bolt 91 constitutes a limiting structure for limiting the movement stroke of the slide block 3. By adjusting the position of the adjusting bolt 91, the movement stroke of the slide block 3 can be precisely controlled.

[0042] The implementation principle of this embodiment is as follows: the adjusting plate 9 is fixed on the inner wall of the valve box 1, and the end of the guide rod 2 away from the drive mechanism 7 is fixed on the adjusting plate 9 to ensure the stable installation of the guide rod 2; the adjusting plate 9 is threaded with adjusting bolts 91, the end of which serves as a limiting structure to restrict the movement stroke of the slide block 3. On the one hand, the movement stroke of the slide block 3 can be flexibly adjusted, and the movement position of the slide block 3 can be precisely controlled according to the actual working conditions and production needs to meet different working scenarios. At the same time, it is also convenient for equipment debugging and maintenance, and improves the efficiency and reliability of the entire slide block valve.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A high-resistance metal slide gate valve, comprising a valve housing (1), wherein a first valve port (11) and a second valve port (12) are formed on the valve housing (1) coaxially arranged, characterized in that, The valve box (1) is provided with a guide rod (2) arranged perpendicularly to the axis of the first valve port (11) and the second valve port (12). A slide block (3) is slidably connected to the guide rod (2). The side of the slide block (3) near the first valve port (11) is connected to a first valve plate (33) through a first elastic element (31), and the side near the second valve port (12) is connected to a second valve plate (34) through a second elastic element (32). A metal sealing ring (331) is provided on the side of the first valve plate (33) away from the slide block (3), and a metal abutment ring (341) is provided on the side of the second valve plate (34) away from the slide block (3). A pressing plate (4) is provided between the first valve plate (33) and the second valve plate (34). A deflection mechanism is provided between the pressing plate (4) and the first valve plate (33) and between the pressing plate (4) and the second valve plate (34). (4) Connected to a drive mechanism (7); the drive mechanism (7) is used to drive the extrusion plate (4) to move along the guide rod (2) so that the slide valve has a synchronous movement state and an extrusion sealing state; in the synchronous movement state, the extrusion plate (4) drives the first valve plate (33), the second valve plate (34) and the slide (3) to move synchronously along the guide rod (2) to the first valve port (11) and the second valve port (12) through the deflection mechanism; in the extrusion sealing state, the slide (3) is blocked and restricted from moving, the extrusion plate (4) continues to move and generates displacement relative to the slide (3), driving the deflection mechanism to generate a deflection action, thereby opening the first valve plate (33) and the second valve plate (34), so that the metal sealing ring (331) forms a sealing fit with the first valve port (11), and the metal abutment ring (341) forms a supporting abutment with the second valve port (12).

2. The high-resistance metal slide gate valve according to claim 1, characterized in that, The deflection mechanism has a dead-point self-locking position; when the compression sealing state is in which the metal sealing ring (331) presses against the first valve port (11), the deflection mechanism passes the dead-point self-locking position and drives the compression plate (4) to abut against the mechanical stop, so that after the driving mechanism (7) removes the thrust, the deflection mechanism can maintain the locked state by using the reverse elastic restoring force generated by the compression of the metal sealing ring (331) and the metal abutment ring (341).

3. A high-resistance metal slide gate valve according to claim 2, characterized in that, The deflection mechanism includes several parallel deflection blocks (5), the two ends of which are respectively pivotally engaged between the first valve plate (33) and the extrusion plate (4), and between the second valve plate (34) and the extrusion plate (4); the first valve plate (33), the second valve plate (34) and the extrusion plate (4) are all provided with abutment grooves (6) that cooperate with the ends of the deflection blocks (5) on their respective inner surfaces; the bottom of the abutment grooves (6) has connected inclined surfaces (61). The oblique surface (61) and the transverse surface (62) form a protruding deflection fulcrum (63) at the connection between them; the end of the deflection block (5) abuts against the deflection fulcrum (63) to form a swing engagement; the slide (3) is provided with a limiting protrusion (35) as the mechanical stop; when the deflection block (5) swings from the oblique surface (61) to the transverse surface (62) and abuts against the limiting protrusion (35), the over-dead point self-locking position is formed.

4. A high-resistance metal slide gate valve according to claim 3, characterized in that, The valve box (1) or the guide rod (2) is provided with a limiting structure for restricting the movement of the slide (3). In the squeeze-sealed state, the slide (3) is blocked and restricted from moving by the limiting structure, and the squeeze plate (4) continues to move and generates displacement relative to the slide (3).

5. A high-resistance metal slide gate valve according to claim 4, characterized in that, An adjusting plate (9) is fixed on the inner wall of the valve box (1), and the end of the guide rod (2) away from the drive mechanism (7) is fixed to the adjusting plate (9); an adjusting bolt (91) is threaded on the adjusting plate (9), and the end of the adjusting bolt (91) constitutes the limiting structure for limiting the travel of the slide (3).

6. A high-resistance metal slide gate valve according to claim 3, characterized in that, The metal sealing ring (331) and the metal abutment ring (341) are arranged coaxially, and the deflection blocks (5) are arranged in several groups symmetrically with the axis of the metal sealing ring (331) as the center.

7. A high-resistance metal slide gate valve according to claim 1, characterized in that, The sealing surface of the metal sealing ring (331) is coated with a soft metal powder layer.

8. A high-resistance metal slide gate valve according to claim 1, characterized in that, The first valve port (11) is provided with a conical bevel (111), and the metal sealing ring (331) is a conical structure that cooperates with the conical bevel (111). The large port of the metal sealing ring (331) is arranged facing the first valve port (11) so as to achieve line sealing or surface sealing after abutting with the conical bevel (111). The first valve plate (33) is provided with a frustum (332). The small port of the metal sealing ring (331) is sleeved on the frustum (332), and the position is limited by a cover plate (333) on the frustum (332).

9. A high-resistance metal slide gate valve according to claim 1, characterized in that, The first elastic element (31) and the second elastic element (32) are both arc-shaped elastic plates; the top of the slide (3) is provided with a slot (36) that is adapted to the arc-shaped elastic plate, and a positioning pin (361) is inserted into the slot (36); the bottom end of the arc-shaped elastic plate is fixed on the slide (3), and the top end of the arc-shaped elastic plate is slidably connected to the positioning pin (361) through a provided sliding hole.

10. A high-resistance metal slide gate valve according to claim 1, characterized in that, The first valve plate (33) and the second valve plate (34) are both rectangular in shape, and the sides of the first valve plate (33) and the second valve plate (34) are provided with ear plates (39) for connecting with the arc-shaped elastic plate. The slide (3) is provided with a clearance groove (37) to provide the ear plates (39) with a space for movement.

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