Active distance-expanding double-valve-plate sealing gate valve

Abstract

The invention discloses an active distance expanding double-valve-plate sealing gate valve which comprises a valve body, a valve cavity, a first valve plate, a second valve plate, a driving mechanism and a valve plate distance adjusting mechanism. The valve plate distance adjusting mechanism is movably connected with the first valve plate and the second valve plate, responds to the driving action of the driving mechanism, and actively adjusts the distance between the first valve plate and the second valve plate in the opening and closing process of the valve plates; when the valve is closed, the valve plate distance adjusting mechanism drives the two valve plates to be away from each other to increase the distance, so that the pressing force of the first valve plate and the second valve plate attached to the upstream and downstream valve seat sealing surfaces of the valve cavity is improved; when the valve is opened, the valve plate distance adjusting mechanism drives the two valve plates to get close to each other to reduce the distance so as to reduce the friction with the sealing surface of the valve seat. The distance between the double valve plates is actively adjusted by arranging the valve plate distance adjusting mechanism, so that the unification of high-pressure sealing performance and low frictional wear is realized, and the contradiction between sealing and wear is solved.

Description

Technical Field

[0001] This invention belongs to the field of vacuum slide gate valve technology, and particularly relates to an active expansion dual-valve plate sealing slide gate valve. Background Technology

[0002] Traditional dual-valve-plate gate valves employ a fixed-spacing design, relying on the deformation of elastic elements on the valve plate sealing surface to compensate for errors and achieve a seal. This design has significant drawbacks: during valve opening and closing, the two valve plates remain in contact with the valve seat sealing surface, resulting in sliding friction and severe wear of the sealing surface; in the closed state, the clamping force of the valve plates on the valve seat is mainly provided by back pressure, which varies with system pressure fluctuations. When the system pressure decreases, insufficient clamping force can easily lead to seal failure and leakage. Therefore, existing dual-valve-plate valves struggle to balance sealing reliability and low wear life, making it difficult to simultaneously meet the requirements of high-pressure sealing and long-term operation. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides an active spacing double valve plate sealing gate valve, which actively adjusts the spacing of the double valve plates by setting a valve plate spacing adjustment mechanism, thereby achieving a balance between high pressure sealing and low friction and wear, and resolving the contradiction between sealing and wear.

[0004] Technical solution: To achieve the above objectives, the present invention provides an active expansion gap double valve plate sealing slide valve, comprising a valve body, a valve cavity disposed inside the valve body, a first valve plate and a second valve plate movably disposed inside the valve cavity, and a drive mechanism for driving the valve plates to open and close, and further comprising a valve plate spacing adjustment mechanism disposed between the first valve plate and the second valve plate.

[0005] The valve plate spacing adjustment mechanism is movably connected to the first valve plate and the second valve plate respectively. In response to the driving action of the driving mechanism, it actively adjusts the spacing between the first valve plate and the second valve plate during the opening and closing of the valve plates.

[0006] During valve closing, the valve plate spacing adjustment mechanism drives the two valve plates to move away from each other to increase the spacing, thereby increasing the clamping force of the first valve plate and the second valve plate against the upstream and downstream valve seat sealing surfaces of the valve cavity. During valve opening, the valve plate spacing adjustment mechanism drives the two valve plates to move closer to each other to decrease the spacing, thereby reducing the clamping force of the first valve plate and the second valve plate against the upstream and downstream valve seat sealing surfaces of the valve cavity, so that the first valve plate and the second valve plate move out of the valve seat channel as a compact whole, thereby reducing friction with the valve seat sealing surface.

[0007] Furthermore, the valve plate spacing adjustment mechanism includes:

[0008] An actuation component for increasing the spacing is used to drive the first valve plate and the second valve plate away from each other during the valve closing process;

[0009] And a spacing reduction actuator for driving the first valve plate and the second valve plate closer to each other during valve opening.

[0010] Furthermore, it also includes a guide rail parallel to the axis of the valve plate, and the output end of the drive mechanism is connected to a mounting bracket, which is fixedly connected to the guide rail; the first valve plate and the second valve plate are respectively slidably mounted on the guide rail via sliders on them.

[0011] Furthermore, the spacing adjustment execution component is a wedge-type component, which includes an active wedge block that is threadedly engaged with a drive screw that is rotatably mounted on the guide rail, and a first driven wedge block and a second driven wedge block that are slidably connected to the first valve plate and the second valve plate, respectively. The drive screw is connected to a servo motor.

[0012] The working surfaces on both sides of the active wedge block are inclined surfaces, and the working surfaces of the first driven wedge block and the second driven wedge block are complementary inclined surfaces.

[0013] The inclined surface of the active wedge block directly contacts the inclined surfaces of the first driven wedge block and the second driven wedge block and forms a sliding pair, so that the linear motion of the active wedge block along the opening and closing direction of the valve plate can be converted into the separation motion of the first driven wedge block and the second driven wedge block in the direction perpendicular to the opening and closing direction of the valve plate through the sliding of the inclined surface, thereby driving the distance between the first valve plate and the second valve plate to increase.

[0014] Furthermore, guide shafts are fixedly provided on the first driven wedge block and the second driven wedge block respectively, and guide grooves adapted to the guide shafts are correspondingly provided on the first valve plate and the second valve plate. The extension direction of the guide grooves is consistent with the opening and closing movement direction of the valve plate. The guide shafts can slide along the guide grooves, thereby converting the lateral movement of the first driven wedge block and the second driven wedge block into the spacing adjustment movement of the first valve plate and the second valve plate.

[0015] Furthermore, a spring is also provided between the guide shaft and the end stop of the guide groove.

[0016] Furthermore, the spacing reduction actuator is a sheet-like or wavy metal elastic sheet, with its two ends fixedly connected to the first valve plate and the second valve plate, respectively.

[0017] When the spacing adjustment actuator releases the thrust on the two valve plates, the metal elastic sheet pulls the first valve plate and the second valve plate closer to each other by its own elastic restoring force.

[0018] Furthermore, a friction-reducing structure is provided on the contact slope surface between the active wedge block and the first driven wedge block and the second driven wedge block; the friction-reducing structure is one of a friction-reducing coating, an embedded friction-reducing plate, or a lubricating oil groove.

[0019] Furthermore, sealing rings are respectively provided on the sealing surfaces opposite to each other of the first valve plate and the second valve plate.

[0020] Furthermore, guide blocks are provided at both ends of the guide rail, and guide channels extending along the opening and closing direction of the valve plate are correspondingly opened on the inner wall of the valve cavity, with the guide block slides being fitted into the guide channels.

[0021] Beneficial Effects: This invention achieves a balance between high-pressure sealing and low frictional wear through a valve plate spacing adjustment mechanism, resolving the contradiction between sealing and wear. When closing the valve, the valve plate spacing adjustment mechanism actively expands the double valve plates, pressing them against the valve seat with a clamping force far exceeding that of traditional structures, forming an extremely reliable seal. In particular, it can adapt to fluctuations in medium pressure, always maintaining an over-tightened state, completely eliminating the risk of leakage under high-pressure conditions. When opening the valve, the valve plate spacing adjustment mechanism first causes the double valve plates to retract, moving them out of the sealing channel as a compact whole, minimizing the sliding friction contact area and relative sliding distance between the valve plates and the valve seat, fundamentally solving the wear problem during the opening process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the slide gate valve of the present invention;

[0023] Figure 2 This is a half-sectional structural diagram of the slide gate valve of the present invention;

[0024] Figure 3 This is a structural schematic diagram of the first valve plate, the second valve plate, and the valve plate spacing adjustment mechanism;

[0025] Figure 4 This is an exploded view of the structure of the first valve plate, the second valve plate, and the valve plate spacing adjustment mechanism.

[0026] Figure 5 This is a cross-sectional structural diagram of the valve plate at the guide groove position. Detailed Implementation

[0027] The invention will now be further described with reference to the accompanying drawings.

[0028] like Figure 1 and Figure 2As shown, an active spacing-expanding dual-valve-plate sealing slide gate valve includes a valve body 1, a valve cavity 2 disposed inside the valve body 1, a first valve plate 3 and a second valve plate 4 movably disposed within the valve cavity 2, and a drive mechanism 5 for driving the valve plates to open and close. It also includes a valve plate spacing adjustment mechanism 6 disposed between the first valve plate 3 and the second valve plate 4. The valve plate spacing adjustment mechanism 6 is movably connected to the first valve plate 3 and the second valve plate 4 respectively, and responds to the driving action of the drive mechanism 5 by actively adjusting the spacing between the first valve plate 3 and the second valve plate 4 during the opening and closing of the valve plates. During valve closing, the valve plate spacing adjustment mechanism 6 drives the two valve plates to move away from each other, increasing the spacing to enhance the clamping force of the first valve plate 3 and the second valve plate 4 against the upstream and downstream valve seat sealing surfaces 21 of the valve cavity 2. During valve opening, the valve plate spacing adjustment mechanism 6 drives the two valve plates to move closer together, decreasing the spacing to reduce the clamping force of the first valve plate 3 and the second valve plate 4 against the upstream and downstream valve seat sealing surfaces 21 of the valve cavity 2. This allows the first valve plate 3 and the second valve plate 4 to move out of the valve seat channel as a compact unit, reducing friction with the valve seat sealing surface 21. This invention changes the working mode of the dual valve plates from fixed, passive sealing to active adjustment, providing a basis for achieving the goal of widening the gap to maintain sealing when closing the valve and narrowing the gap to prevent wear when opening the valve. It achieves a balance between high-pressure sealing and low friction and wear, resolving the inherent contradiction between sealing and wear in traditional valves. At the end of the valve closing stroke, the valve plate spacing adjustment mechanism 6 drives the valve plates to widen the spacing. This actively applied mechanical clamping force is superimposed with the back pressure generated by the medium pressure, which significantly increases the total sealing specific pressure, thereby fundamentally solving the sealing failure problem caused by system pressure fluctuations. At the beginning of the valve opening stroke, the valve plate spacing adjustment mechanism 6 first drives the valve plates to narrow the spacing, so that the sealing surfaces of the two valve plates are completely separated from the sealing surfaces of the valve seat or only maintain a very small pressure, and then the valve opening and withdrawal movement is performed. This transforms sliding friction into near-zero contact movement, which greatly reduces the opening and closing torque and the wear of the sealing surfaces.

[0029] like Figure 2 and Figure 3 As shown, the valve plate spacing adjustment mechanism 6 includes: a spacing increase actuator 6a, used to drive the first valve plate 3 and the second valve plate 4 away from each other during valve closing; and a spacing decrease actuator 6b, used to drive the first valve plate 3 and the second valve plate 4 closer to each other during valve opening. By decomposing the complex compound motion of the valve plate spacing adjustment mechanism 6 into two corresponding motions, the spacing increase actuator 6a and the spacing decrease actuator 6b, the increase and decrease of the valve plate spacing can be achieved in the most efficient and reliable way, improving the control accuracy and functional reliability of the entire system. Specifically, increasing the spacing requires a large and stable thrust, while decreasing the spacing can be a simple reset action. This modular design improves the reliability and flexibility of the system.

[0030] like Figure 2and Figure 3 As shown, it also includes a guide rail 61 parallel to the valve plate axis. The output end of the drive mechanism 5 is connected to a mounting bracket 6.1, which is fixedly connected to the guide rail 61. The first valve plate 3 and the second valve plate 4 are slidably mounted on the guide rail 61 via sliders 62 on them. This ensures that the first valve plate 3 and the second valve plate 4 maintain a high degree of synchronization during the adjustment movement, avoiding sealing failure or mechanism damage caused by unilateral jamming.

[0031] like Figure 2 , Figure 3 and Figure 4 As shown, the spacing adjustment actuator 6a is a wedge-type assembly, which includes an active wedge block 64 that is threadedly engaged with a drive screw 63 that is rotatably mounted on the guide rail 61, and a first driven wedge block 65 and a second driven wedge block 66 that are slidably connected to the first valve plate 3 and the second valve plate 4, respectively. The drive screw 63 is connected to a servo motor 67. The two working surfaces of the active wedge block 64 are inclined surfaces, and the working surfaces of the first driven wedge block 65 and the second driven wedge block 66 are complementary inclined surfaces. The inclined surfaces of the active wedge block 64 are in direct contact with the inclined surfaces of the first driven wedge block 65 and the second driven wedge block 66 and form a sliding pair, so that the linear motion of the active wedge block 64 along the valve plate opening and closing direction can be converted into the disjointed motion of the first driven wedge block 65 and the second driven wedge block 66 in a direction perpendicular to the valve plate opening and closing direction by sliding on the inclined surfaces, thereby driving the spacing between the first valve plate 3 and the second valve plate 4 to increase. By utilizing the mechanical properties of the inclined plane mechanism, the rotational motion of the drive screw 63 is efficiently converted into a huge adjustable thrust. This structure has the characteristics of force amplification and self-locking. It can generate a huge output force with a small input force to open the valve plate, and can automatically lock in the closed state to maintain the required high sealing pressure. The operation is reliable.

[0032] like Figure 3 , Figure 4 and Figure 5 As shown, guide shafts 68 are fixedly mounted on the first driven wedge block 65 and the second driven wedge block 66, respectively. Guide grooves 34a, adapted to the guide shafts 68, are correspondingly provided on the first valve plate 3 and the second valve plate 4. The extending direction of the guide grooves 34a is consistent with the opening and closing movement direction of the valve plates. The guide shafts 68 can slide along the guide grooves 34a, thereby converting the lateral movement of the first driven wedge block 65 and the second driven wedge block 66 into the spacing adjustment movement of the first valve plate 3 and the second valve plate 4. Through the cooperation of the guide shafts 68 and the guide grooves 34a, the linear motion from the wedges is transmitted to the valve plates without loss and with low friction, and converted into a spacing adjustment linear motion. This decouples the linear opening and closing motion from the spacing adjustment motion, ensuring that the two motions do not interfere with each other and proceed smoothly.

[0033] A spring 34c is also provided between the guide shaft 68 and the groove end stop 34b of the guide groove 34a to provide a constant reset preload force. This force ensures that when the active wedge block 64 retracts, the delay or asynchrony caused by mechanism clearance or friction is eliminated, thereby improving the action responsiveness.

[0034] The spacing reduction actuator 6b is a single-piece or wavy metal elastic sheet 69, with its two ends fixedly connected to the first valve plate 3 and the second valve plate 4, respectively. When the spacing increase actuator 6a releases the thrust on the two valve plates, the metal elastic sheet 69 pulls the first valve plate 3 and the second valve plate 4 closer together using its own elastic restoring force. The metal elastic sheet 69 provides passive reset, based on the storage and release of the material's elastic deformation energy. During the spacing increase process, the metal elastic sheet 69 is stretched, storing elastic potential energy; when the spacing increase force is released, the stored potential energy is rapidly released and converted into mechanical energy to pull the valve plates back to their reset state. No additional power source is required, the structure is simple, and the cost is low, making it very suitable for frequent opening and closing requirements.

[0035] The contact slopes of the active wedge block 64, the first driven wedge block 65, and the second driven wedge block 66 are provided with a friction-reducing structure; the friction-reducing structure is one of a friction-reducing coating, an embedded friction-reducing plate, or a lubricating oil groove. This not only improves mechanical efficiency but also reduces wear and prevents jamming.

[0036] like Figure 2 As shown, sealing rings 22 are respectively provided on the opposite sealing surfaces of the first valve plate 3 and the second valve plate 4. When the valve plate is forcefully opened by the wedge block, the sealing ring is strongly compressed and generates a huge rebound force, which fits tightly with the valve seat sealing surface 21. This is an actively applied seal, forming the first main sealing barrier of the valve, and a reliable seal is achieved by relying on this mechanical clamping force.

[0037] like Figure 2 As shown, guide blocks 6.2 are provided at both ends of the guide rail 61, and guide channels 20 extending along the opening and closing direction of the valve plate are correspondingly opened on the inner wall of the valve cavity 2. The guide blocks 6.2 are slidably arranged in the guide channels 20 to provide auxiliary guidance and support, effectively preventing sagging, overturning or vibration that may occur due to the weight of the components or uneven force, and ensuring the smoothness and straightness of long stroke movement in large-diameter valves.

[0038] This invention achieves a balance between high-pressure sealing and low friction and wear through a valve plate spacing adjustment mechanism, resolving the contradiction between sealing and wear. When closing the valve, the valve plate spacing adjustment mechanism actively expands the double valve plates, pressing them against the valve seat with a clamping force far exceeding that of traditional structures, forming an extremely reliable seal. It is particularly adaptable to fluctuations in medium pressure, always maintaining an over-tightened state, completely eliminating the risk of leakage under high-pressure conditions. When opening the valve, the valve plate spacing adjustment mechanism first causes the double valve plates to retract, moving them synchronously out of the sealing channel as a compact unit. This minimizes the sliding friction contact area and relative sliding distance between the valve plates and the valve seat, fundamentally solving the wear problem during opening, significantly reducing operating torque, and extending the valve's service life.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An active expansion-pitch double-valve-plate sealing gate valve, comprising a valve body (1), a valve cavity (2) disposed inside the valve body (1), a first valve plate (3) and a second valve plate (4) movably disposed within the valve cavity (2), and a drive mechanism (5) for driving the opening and closing movement of the valve plates, characterized in that: It also includes a valve plate spacing adjustment mechanism (6) disposed between the first valve plate (3) and the second valve plate (4); The valve plate spacing adjustment mechanism (6) is movably connected to the first valve plate (3) and the second valve plate (4) respectively. In response to the driving action of the driving mechanism (5), it actively adjusts the spacing between the first valve plate (3) and the second valve plate (4) during the opening and closing of the valve plates. During the valve closing process, the valve plate spacing adjustment mechanism (6) drives the two valve plates to move away from each other to increase the spacing, thereby increasing the clamping force of the first valve plate (3) and the second valve plate (4) against the upstream and downstream valve seat sealing surfaces (21) of the valve cavity (2), respectively. During the valve opening process, the valve plate spacing adjustment mechanism (6) drives the two valve plates to move closer to each other to decrease the spacing, thereby reducing the clamping force of the first valve plate (3) and the second valve plate (4) against the upstream and downstream valve seat sealing surfaces (21) of the valve cavity (2), respectively, so that the first valve plate (3) and the second valve plate (4) move out of the valve seat channel as a compact whole, thereby reducing friction with the valve seat sealing surface (21).

2. The active expansion dual-valve plate sealing slide gate valve according to claim 1, characterized in that: The valve plate spacing adjustment mechanism (6) includes: A spacing adjustment actuator (6a) is used to drive the first valve plate (3) and the second valve plate (4) away from each other during the valve closing process; And a pitch reduction actuator (6b) for driving the first valve plate (3) and the second valve plate (4) closer to each other during the valve opening process.

3. The active expansion dual-valve plate sealing slide gate valve according to claim 2, characterized in that: It also includes a guide rail (61) parallel to the axis of the valve plate, and the output end of the drive mechanism (5) is connected to a mounting bracket (6.1), which is fixedly connected to the guide rail (61); the first valve plate (3) and the second valve plate (4) are respectively slidably mounted on the guide rail (61) via sliders (62) on them.

4. The active expansion dual-valve plate sealing slide gate valve according to claim 3, characterized in that: The spacing adjustment execution component (6a) is a wedge-type component, which includes an active wedge block (64) that is threadedly engaged with a drive screw (63) that is rotatably mounted on the guide rail (61), and a first driven wedge block (65) and a second driven wedge block (66) that are slidably connected to the first valve plate (3) and the second valve plate (4), respectively. The drive screw (63) is connected to a servo motor (67). The working surfaces on both sides of the active wedge block (64) are inclined surfaces, and the working surfaces of the first driven wedge block (65) and the second driven wedge block (66) are complementary inclined surfaces; The inclined surface of the active wedge block (64) directly contacts the inclined surfaces of the first driven wedge block (65) and the second driven wedge block (66) and forms a sliding pair, so that the linear motion of the active wedge block (64) along the opening and closing motion direction of the valve plate can be converted into the separation motion of the first driven wedge block (65) and the second driven wedge block (66) in the direction perpendicular to the opening and closing motion direction of the valve plate through the sliding of the inclined surface, thereby driving the distance between the first valve plate (3) and the second valve plate (4) to increase.

5. The active expansion dual-valve plate sealing slide gate valve according to claim 4, characterized in that: Guide shafts (68) are fixedly provided on the first driven wedge block (65) and the second driven wedge block (66), and guide grooves (34a) adapted to the guide shafts (68) are correspondingly provided on the first valve plate (3) and the second valve plate (4). The extension direction of the guide grooves (34a) is consistent with the opening and closing movement direction of the valve plate. The guide shafts (68) can slide along the guide grooves (34a), thereby converting the lateral movement of the first driven wedge block (65) and the second driven wedge block (66) into the spacing adjustment movement of the first valve plate (3) and the second valve plate (4).

6. The active expansion dual-valve plate sealing slide gate valve according to claim 5, characterized in that: A spring (34c) is also provided between the guide shaft (68) and the groove end stop (34b) of the guide groove (34a).

7. The active expansion dual-valve plate sealing slide gate valve according to claim 4, characterized in that: The spacing reduction actuator (6b) is a sheet or wave-shaped metal elastic sheet (69), with its two ends fixedly connected to the first valve plate (3) and the second valve plate (4) respectively. When the spacing adjustment actuator (6a) releases the thrust on the two valve plates, the metal elastic sheet (69) pulls the first valve plate (3) and the second valve plate (4) closer to each other by its own elastic restoring force.

8. An active expansion dual-valve plate sealing slide gate valve according to claim 4 or 5, characterized in that: The contact slope surfaces of the active wedge block (64), the first driven wedge block (65), and the second driven wedge block (66) are provided with a friction-reducing structure; the friction-reducing structure is one of a friction-reducing coating, an embedded friction-reducing plate, or a lubricating oil groove.

9. The active expansion dual-valve plate sealing slide valve according to claim 1, characterized in that: Sealing rings (22) are respectively provided on the sealing surfaces opposite to the first valve plate (3) and the second valve plate (4).

10. The active expansion-pitch dual-valve plate sealing slide valve according to claim 3, characterized in that: The guide rail (61) is provided with guide blocks (6.2) at both ends, and the inner wall of the valve cavity (2) is provided with a guide channel (20) extending along the opening and closing direction of the valve plate. The guide block (6.2) slide is provided in the guide channel (20).

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