A gate valve

Abstract

This invention relates to a slide gate valve, comprising an upper cover plate, a valve body seat, a traveling and sealing device slidably connected to the valve body seat, a lower cover plate, and a driving mechanism. The traveling and sealing device includes an upper plate, an outer frame, an inner frame, and a lower plate. The driving mechanism is used to push the outer frame. Sealing rings are provided in sealing ring grooves on the surfaces of the upper and lower plates. Multiple ejection mechanisms are provided on the upper and lower surfaces of the outer frame, and wedge-shaped grooves that cooperate with the ejection mechanisms are provided on the upper and lower plates. The inner frame includes an upper spring and a lower spring. One end of the upper spring has a tongue, and the other end is fixedly connected to the upper plate. One end of the lower spring is fixedly connected to the end of the upper spring near the tongue, and the other end is fixedly connected to the lower plate. The outer frame and the inner frame are limited and fitted by the tongue. The sealing rings on the surfaces of the upper and lower plates of this invention are in close contact with the upper and lower cover plates, achieving a strong seal and significantly improving the sealing effect of the slide gate valve.

Description

Technical Field

[0001] The invention relates to a plug valve. Background Art

[0002] The gate valve, also known as the manual knife gate valve, is a valve in which the gate and the valve seat are always in close contact and sealed. The principle is that a round hole of the same diameter is opened on the gate, and the round hole on the gate is completely separated and matched with the diameter by opening and closing the gate. The sealing structure of the gate valve can be divided into soft sealing and hard sealing structures.

[0003] The opening and closing part of the electric gate valve is the gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened or fully closed and cannot be used for adjustment and throttling. The gate has two sealing surfaces. The most commonly used mode is that the two sealing surfaces of the gate valve form a wedge shape, and the wedge angle varies with the valve parameters.

[0004] Vacuum evaporation, or evaporation for short, refers to a process in which a coating material (or film material) is evaporated and gasified by a certain heating evaporation method under vacuum conditions, and the particles fly to the surface of the substrate and condense into a film. Evaporation is an earlier and more widely used vapor deposition technology, with the advantages of simple film formation method, high film purity and density, and unique film structure and performance.

[0005] The gate valve is a part between the coating chamber and the vacuum pump, and is used to isolate the vacuum pump and the chamber when the vacuum pump is not working. The sealing effect of the existing gate valve needs to be improved to meet the vacuum degree requirements of the coating chamber. Summary of the invention

[0006] The present invention aims at the technical problems existing in the prior art and provides a plug valve to solve the problem of poor sealing effect.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A plug valve comprises an upper cover plate, a valve body seat, a travel and sealing device slidably connected to the valve body seat, a lower cover plate, and a driving mechanism; the travel and sealing device comprises an upper plate, an outer frame, an inner frame and a lower plate; the driving mechanism is used to push the outer frame; sealing rings are arranged in the sealing ring grooves on the surfaces of the upper plate and the lower plate; a plurality of ejection mechanisms are arranged on the upper and lower surfaces of the outer frame, and wedge-shaped grooves matching the ejection mechanisms are arranged on the upper and lower plates; the inner frame comprises an upper spring sheet and a lower spring sheet; a tongue is arranged at one end of the upper spring sheet, and the other end is fixedly connected to the upper plate; one end of the lower spring sheet is fixedly connected to one end of the upper spring sheet close to the tongue, and the other end is fixedly connected to the lower plate; the outer frame and the inner frame are matched by the tongue limit.

[0009] The beneficial effect of the present invention is that by designing the ejection mechanism, wedge-shaped groove, upper spring sheet, lower spring sheet and other structures, the sealing rings on the surfaces of the upper plate and the lower plate are in close contact with the upper cover plate and the lower cover plate, thereby achieving strong sealing and significantly improving the sealing effect of the gate valve.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the ejection mechanism is a roller.

[0012] Furthermore, four ejection mechanisms are symmetrically arranged on the upper surface and the lower surface of the outer frame.

[0013] Furthermore, the driving mechanism is a cylinder; the outer frame is linked with a guide rod of the cylinder.

[0014] Furthermore, when the cylinder pushes the outer frame for sealing, after the upper plate and the lower plate are lifted up, the portion where the upper spring sheet and the upper plate are connected tilts upward, and the portion where the lower spring sheet and the lower plate are connected tilts downward, and the deformation is maintained.

[0015] Furthermore, when the cylinder pulls the outer frame back to release the seal, the upper spring sheet and the lower spring sheet, through the previously maintained deformation, pull the ejection mechanism back into the wedge-shaped groove during the return process.

[0016] Furthermore, two slide grooves are symmetrically arranged on the inner side wall of the valve body seat.

[0017] Furthermore, the inner frame also includes a fixing plate; the lower spring sheet and the upper spring sheet are connected via the fixing plate.

[0018] Furthermore, the upper spring sheet is fixed to the upper plate by bolts; and the lower spring sheet is fixed to the lower plate by bolts.

[0019] Furthermore, two handles are symmetrically arranged on the outer side wall of the valve body seat.

[0020] The beneficial effect of adopting the above further solution is to further improve the sealing effect of the gate valve to meet the vacuum degree requirement of the coating chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 An exploded view of the present invention;

[0023] Figure 3 An exploded view of the traveling and sealing device of the present invention;

[0024] Figure 4 An exploded view of the traveling and sealing device of the present invention;

[0025] Figure 5 It is an exploded view of the inner frame of the present invention;

[0026] Figure 6 It is a front view of the present invention;

[0027] Figure 7 for Figure 6 Cross-sectional view along the AA direction.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Upper cover plate, 2. Valve body seat, 3. Travel and sealing device, 4. Lower cover plate, 5. Cylinder, 21. Slide groove, 22. Handle, 31. Upper plate, 32. Outer frame, 33. Inner frame, 34. Lower plate, 35. Sealing ring, 36. Wedge groove, 321. Roller, 331. Upper spring sheet, 332. Lower spring sheet, 333. Tongue, 334. Fixed plate. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] It should be understood that the terms "up", "down", "left", "right" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] Example 1

[0033] like Figure 1 to Figure 7 As shown, the gate valve described in this embodiment includes an upper cover plate 1, a valve body seat 2, a travel and sealing device 3, a lower cover plate 4, and a cylinder 5; the upper cover plate 1, the valve body seat 2 and the lower cover plate 4 are used to be installed between the vacuum pump and the coating machine cavity; the cylinder 5 is used to push the travel and sealing device 3; the travel and sealing device 3 is slidably connected with the valve body seat 2;

[0034] The walking and sealing device 3 includes an upper plate 31, an outer frame 32, an inner frame 33 and a lower plate 34; sealing rings 35 are arranged in the sealing ring grooves on the surfaces of the upper plate 31 and the lower plate 34; the outer frame 32 is linked with the guide rod of the cylinder 5; a plurality of rollers 321 are arranged on the upper and lower surfaces of the outer frame 32, and roller grooves matching with the rollers 321 are arranged at corresponding positions of the upper plate 31 and the lower plate 34, and the roller grooves are wedge-shaped grooves 36, so that the rollers 321 can come out of the wedge-shaped grooves 36;

[0035] The inner frame 33 includes an upper spring piece 331, a lower spring piece 332 and a fixing plate 334; a tongue 333 is provided at one end of the upper spring piece 331; the outer frame 32 and the inner frame 33 are limited by the tongue 333; the upper spring piece 331 and the lower spring piece 332 are fixed together at one end close to the tongue 333 by a fixing plate 334; the upper spring piece 331 and the lower spring piece 332 are relatively movable at one end away from the tongue 333; the upper spring piece 331 and the lower spring piece 332 are fixed to the upper plate 31 at one end away from the tongue 333 by bolts, and the lower spring piece 332 is fixed to the lower plate 34 at one end away from the tongue 333 by bolts.

[0036] Two handles 22 are symmetrically arranged on the outer side wall of the valve body seat 2 for easy picking and moving; two slide grooves 21 are symmetrically arranged on the inner side wall of the valve body seat 2 for easy walking and sliding of the sealing device 3.

[0037] The working principle of this embodiment:

[0038] When sealing is required, when the cylinder 5 pushes the outer frame 32, the outer frame 32 and the inner frame 33 move forward together because they are limited by the tongue 333. At the same time, the outer frame 32 moves the upper plate 31, the lower plate 34 and the outer frame 32 together through the roller 321 and the wedge groove 36. Therefore, the entire travel and sealing device 3 moves forward;

[0039] When the tongue 333 of the inner frame 33 abuts against the inner side wall of the valve body seat 2, the outer frame 32 overcomes the limit fit between the outer frame 32 and the inner frame 33, so that the outer frame 32 is displaced relative to the inner frame 33, and the outer frame 32 continues to move forward;

[0040] When the outer frame 32 continues to move forward, since the tongue 333 of the inner frame 33 has already come into contact with the valve body seat 2, the inner frame 33 will not move forward, and the upper spring sheet 331 and the lower spring sheet 332 will not move forward either, and the upper plate 31 and the lower plate 34 connected to the upper spring sheet 331 and the lower spring sheet 332 will not move forward either;

[0041] Then when the outer frame 32 continues to move forward, the roller 321 will come out of the wedge-shaped groove 36. After coming out, because the wedge-shaped groove 36 is wedge-shaped, the upper plate 31 and the lower plate 34 will be pushed up and down respectively. After the upper plate 31 and the lower plate 34 are pushed up and down, the sealing ring 35 on the surface of the upper plate 31 and the lower plate 34 will be in close contact with the upper cover plate 1 and the lower cover plate 4 to achieve sealing!

[0042] Because the upper spring sheet 331 and the lower spring sheet 332 are spring sheets, after the upper plate 31 and the lower plate 34 are lifted up, the portion where the upper spring sheet 331 and the upper plate 31 are connected will bend upward, and the portion where the lower spring sheet 332 and the lower plate 34 are connected will bend downward, and maintain deformation to facilitate the subsequent pulling back action.

[0043] When releasing the seal, the cylinder 5 pulls back the outer frame 32 , and the upper spring sheet 331 and the lower spring sheet 332 pull the roller 321 back into the wedge-shaped groove 36 during the return process through the previously maintained deformation.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gate valve, characterized in that: The invention comprises an upper cover plate (1), a valve body seat (2), a travel and sealing device (3) slidably connected to the valve body seat (2), a lower cover plate (4), and a driving mechanism; the travel and sealing device (3) comprises an upper plate (31), an outer frame (32), an inner frame (33), and a lower plate (34); the driving mechanism is used to push the outer frame (32); sealing rings (35) are arranged in the sealing ring grooves on the surfaces of the upper plate (31) and the lower plate (34); a plurality of ejection mechanisms are arranged on the upper surface and the lower surface of the outer frame (32); wedge-shaped grooves (36) matching with the ejection mechanisms are arranged on the upper plate (31) and the lower plate (34); ); the inner frame (33) comprises an upper spring sheet (331) and a lower spring sheet (332); one end of the upper spring sheet (331) is provided with a tongue portion (333), and the other end is fixedly connected to the upper plate (31); one end of the lower spring sheet (332) is fixedly connected to one end of the upper spring sheet (331) close to the tongue portion (333), and the other end is fixedly connected to the lower plate (34); the outer frame (32) and the inner frame (33) are limited by the tongue portion (333); two slide grooves (21) are symmetrically provided on the inner side wall of the valve body seat (2), and four ejection mechanisms are symmetrically provided on the upper surface and the lower surface of the outer frame (32).

2. A gate valve according to claim 1, characterized in that: The ejection mechanism is a roller (321).

3. A gate valve according to any one of claims 1 to 2, characterized in that: The driving mechanism is a cylinder (5); the outer frame (32) is linked with a guide rod of the cylinder (5).

4. A gate valve according to claim 1, characterized in that: When the cylinder (5) pushes the outer frame (32) to seal, the upper plate (31) and the lower plate (34) are lifted up, and the portion where the upper spring sheet (331) and the upper plate (31) are connected tilts upward, and the portion where the lower spring sheet (332) and the lower plate (34) are connected tilts downward, and the deformation is maintained.

5. A gate valve according to claim 4, characterized in that: When the cylinder (5) pulls the outer frame (32) back to release the seal, the upper spring sheet (331) and the lower spring sheet (332) are deformed and, during the return process, pull the ejection mechanism back into the wedge-shaped groove (36).

6. The gate valve according to claim 1, characterized in that: The inner frame (33) further comprises a fixing plate (334); the lower elastic sheet (332) and the upper elastic sheet (331) are connected via the fixing plate (334).

7. The gate valve according to claim 1, characterized in that: The upper spring sheet (331) is fixed to the upper plate (31) via bolts; and the lower spring sheet (332) is fixed to the lower plate (34) via bolts.

8. The gate valve according to claim 1, characterized in that: Two handles (22) are symmetrically arranged on the outer side wall of the valve body seat (2).

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