Wear-resistant knife-shaped gate valve with high sealing performance

Abstract

The utility model discloses a wear-resistant knife type gate valve with high sealing performance, which comprises a valve body and a valve cover, the valve cover is fixed on the valve body, a knife type valve plate is arranged on the valve cover, the knife type valve plate is positioned in the middle of an inner cavity of the valve body, a caulking groove is arranged in the valve body, a first annular sealing ring is arranged in the caulking groove, a movable cavity is arranged on the valve body close to the caulking groove, and a second annular sealing ring is arranged in the movable cavity. A first supporting plate is arranged on the side wall of the movable cavity and the side wall of the caulking groove in a sliding mode, a first fixed connecting plate and a connecting end plate are fixed to the two ends, located in the caulking groove and the movable cavity, of the first supporting plate respectively, and the first annular sealing ring is fixed to the first fixed connecting plate. The utility model belongs to the technical field of knife gate valves, and particularly relates to a wear-resistant knife gate valve with high sealing performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of knife gate valves, and particularly relates to a knife gate valve with wear resistance and high sealing performance. Background Art

[0002] The opening and closing member of a knife gate valve is a gate plate. The moving direction of the gate plate is perpendicular to the fluid direction. The medium is cut off by the knife-shaped gate plate. It has the following advantages: The knife gate valve has a small installation space, low working pressure, and is not easy to accumulate sundries.

[0003] There is a large contact surface between the gate plate and the sealing ring of the knife gate valve. Therefore, when the valve plate opens and closes, there will be a large friction between the valve plate and the sealing ring. After multiple openings and closings, it is easy to cause wear, and there will be a gap between the valve plate and the sealing ring, resulting in poor sealing and leakage of the medium. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a knife gate valve with wear resistance and high sealing performance, effectively solving the problem of poor sealing caused by the gap between the valve plate and the sealing ring.

[0005] In order to achieve the above functions, the technical solution adopted by the utility model is as follows: A knife gate valve with wear resistance and high sealing performance, including a valve body and a valve cover. The valve cover is fixed on the valve body. A knife-shaped valve plate is provided on the valve cover. The knife-shaped valve plate is located in the middle of the inner cavity of the valve body. An embedded groove is provided in the valve body. An annular sealing ring I is provided in the embedded groove. A movable cavity is provided near the embedded groove of the valve body. A support plate I is slidably provided on the side walls of the movable cavity and the embedded groove. At both ends of the support plate I located in the embedded groove and the movable cavity, a fixed connecting plate I and a connecting end plate are respectively fixed. The annular sealing ring I is fixed on the fixed connecting plate I. A spring is fixedly connected between the connecting end plate I and the inner wall of the movable cavity.

[0006] Preferably, a rack I is provided on the top wall of the connecting end plate. An installation plate is provided on the inner side wall of the movable cavity near the annular sealing ring I. A gear is rotatably provided on the installation plate. A limiting plate is fixed under the top wall of the embedded groove. A support plate II is slidably provided on the limiting plate. The support plate II penetrates through the side wall of the embedded groove and slides. A rack II is provided under the top wall of the support plate II. The gear meshes with the rack I and the rack II at the same time. One end of the support plate II is fixed with a fixed connecting plate II. An annular sealing ring II is fixed on the fixed connecting plate II.

[0007] Preferably, the support plate II is L-shaped.

[0008] Preferably, a wear-resistant coating is applied on the side wall of the knife-shaped valve plate.

[0009] Preferably, the thickness of the first annular sealing ring is greater than that of the second annular sealing ring, and the first annular sealing ring and the second annular sealing ring are closely attached up and down.

[0010] Preferably, the connecting end plate is T-shaped and penetrates through the top of the movable cavity and the side wall of the groove.

[0011] The beneficial effects of the present utility model adopting the above structure are as follows: Through the arrangement of the first annular sealing ring and the second annular sealing ring, when the knife-shaped valve plate moves downward, the first annular sealing ring is extruded, causing the connecting end plate at one end to move, thereby driving the gear to rotate. The gear drives the second rack to move, causing the second support plate and the second annular sealing ring to move. The second annular sealing ring is closely attached to the knife-shaped valve plate. When a gap is generated between the first annular sealing ring and the knife-shaped valve plate and the sealing is not tight, the second annular sealing ring further seals to prevent the leakage of the medium and improve the sealing effect of the valve. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of a knife gate valve with wear resistance and high sealing performance proposed by the present utility model;

[0013] Figure 2 It is the front view of a knife gate valve with wear resistance and high sealing performance proposed by the present utility model;

[0014] Figure 3 It is a schematic diagram of the internal structure of a knife gate valve with wear resistance and high sealing performance proposed by the present utility model;

[0015] Figure 4 is Figure 3 The partial enlarged view at A in

[0016] Among them, 1. Valve body, 2. Valve cover, 3. Groove, 4. First annular sealing ring, 5. First fixed connecting plate, 6. First support plate, 7. Connecting end plate, 8. Movable cavity, 9. Spring, 10. First rack, 11. Second rack, 12. Second support plate, 13. Second fixed connecting plate, 14. Limiting plate, 15. Second annular sealing ring, 16. Knife-shaped valve plate, 17. Gear, 18. Mounting plate. Specific Embodiments

[0017] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The following further describes the present utility model in detail with reference to the drawings.

[0019] As Figures 1-4 shown, a wear-resistant and highly sealed knife gate valve proposed by the present utility model includes a valve body 1 and a valve cover 2. The valve cover 2 is fixed on the valve body 1. A knife valve plate 16 is provided on the valve cover 2. The knife valve plate 16 is located in the middle of the inner cavity of the valve body 1. An embedded groove 3 is provided in the valve body 1. A first annular sealing ring 4 is provided in the embedded groove 3. An activity cavity 8 is provided near the embedded groove 3 on the valve body 1. A first support plate 6 is slidably provided on the side walls of the activity cavity 8 and the embedded groove 3. At both ends of the first support plate 6 located in the embedded groove 3 and the activity cavity 8, a first fixed connecting plate 5 and a connecting end plate 7 are respectively fixed. The connecting end plate 7 is T-shaped and its top penetrates the side walls of the activity cavity 8 and the embedded groove 3. The first annular sealing ring 4 is fixed on the first fixed connecting plate 5. A spring 9 is fixedly connected between the connecting end plate 7 and the inner wall of the activity cavity 8. The spring 9 presses against the connecting end plate 7 and the first support plate 6, thereby pressing the first annular sealing ring 4 against both sides of the knife valve plate 16. A wear-resistant coating is applied on the side wall of the knife valve plate 16 to increase the wear resistance between the knife valve plate 16 and the valve body 1.

[0020] As Figure 4 shown, a first rack 10 is provided on the top wall of the connecting end plate 7. An installation plate 18 is provided on the inner side wall of the activity cavity 8 near the first annular sealing ring 4. A gear 17 is rotatably provided on the installation plate 18. A limiting plate 14 is fixed under the top wall of the embedded groove 3. A second support plate 12 is slidably provided on the limiting plate 14. The second support plate 12 is L-shaped and can play a limiting role. The second support plate 12 penetrates the side wall of the embedded groove 3 and slides. A second rack 11 is provided under the top wall of the second support plate 12. The gear 17 meshes with the first rack 10 and the second rack 11 at the same time. One end of the second support plate 12 is fixed with a second fixed connecting plate 13. A second annular sealing ring 15 is fixed on the second fixed connecting plate 13. The second annular sealing ring 15 is closely attached to the knife valve plate 16, improving the sealing effect of the valve. The thickness of the first annular sealing ring 4 is greater than the thickness of the second annular sealing ring 15. The first annular sealing ring 4 and the second annular sealing ring 15 are closely attached up and down.

[0021] During specific use, the initial position of the first annular sealing ring 4 extends out of the groove 3, and the initial position of the second annular sealing ring 15 is located within the groove 3. Rotate the handwheel to move the knife-shaped valve plate 16 up and down within the valve body 1. The knife-shaped valve plate 16 controls the opening and closing of the passage within the valve body 1. During the downward movement of the knife-shaped valve plate 16, it squeezes the first annular sealing ring 4, and the first annular sealing ring 4 drives the first support plate 6 and the connecting end plate 7 to move towards the movable cavity 8 side. The spring 9 is compressed. While the connecting end plate 7 moves, it drives the first rack 10 to move, thereby driving the gear 17 to rotate. The gear 17 drives the second rack 11 to move, causing the second support plate 12 and the second annular sealing ring 15 to move. The second annular sealing ring 15 presses tightly against the knife-shaped valve plate 16. The first annular sealing ring 4 and the second annular sealing ring 15 seal the knife-shaped valve plate 16 simultaneously. When a gap is generated between the first annular sealing ring 4 and the knife-shaped valve plate 16 and the sealing is not tight, the second annular sealing ring 15 further seals, improving the sealing effect of the valve and preventing leakage of the medium.

[0022] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present invention, design similar structural manners and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A knife-shaped gate valve with wear resistance and high sealing performance, comprising a valve body (1) and a valve cover (2), wherein the valve cover (2) is fixed on the valve body (1), and a knife-shaped valve plate (16) is provided on the valve cover (2), and the knife-shaped valve plate (16) is located in the middle of the inner cavity of the valve body (1), characterized in that: The valve body (1) is provided with an embedding groove (3), and an annular sealing ring (4) is provided in the embedding groove (3). The valve body (1) is provided with an active cavity (8) near the embedding groove (3). A support plate (6) is slidably provided on the side walls of the active cavity (8) and the embedding groove (3). A fixed connecting plate (5) and a connecting end plate (7) are respectively fixed at two ends of the support plate (6) located in the embedding groove (3) and the active cavity (8). The annular sealing ring (4) is fixed on the fixed connecting plate (5), and a spring (9) is fixedly connected between the connecting end plate (7) and the inner wall of the active cavity (8).

2. A wear-resistant and high-sealing knife-type gate valve according to claim 1, characterized in that: A rack (10) is provided on the top wall of the connecting end plate (7); a mounting plate (18) is provided on the inner side wall of the movable chamber (8) close to the annular sealing ring (4); a gear (17) is rotatably provided on the mounting plate (18); a limit plate (14) is fixed under the top wall of the embedding groove (3); a support plate (12) is slidably provided on the limit plate (14); the support plate (12) penetrates the side wall of the embedding groove (3) and slides; a rack (11) is provided under the top wall of the support plate (12); the gear (17) is meshed with the rack (10) and the rack (11) at the same time; a fixed connecting plate (13) is fixed at one end of the support plate (12); and an annular sealing ring (15) is fixed on the fixed connecting plate (13).

3. A wear-resistant and high-sealing knife-type gate valve according to claim 2, characterized in that: The second support plate (12) is L-shaped.

4. A wear-resistant and high-sealing knife-type gate valve according to claim 3, characterized in that: The side wall of the knife-shaped valve plate (16) is coated with a wear-resistant coating.

5. A wear-resistant and high-sealing knife-type gate valve according to claim 4, characterized in that: The thickness of the annular sealing ring 1 (4) is greater than the thickness of the annular sealing ring 2 (15), and the annular sealing ring 1 (4) and the annular sealing ring 2 (15) are tightly attached to each other up and down.

6. A wear-resistant and high-sealing knife-type gate valve according to claim 5, characterized in that: The connecting end plate (7) is T-shaped and the top thereof passes through the active cavity (8) and the side wall of the embedding groove (3).

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