Leakage-proof wear-resistant valve mechanism

Abstract

The utility model discloses a leakproof wear-resistant valve mechanism which comprises a valve body, a gate plate, a hand wheel, a valve cover and a valve rod, the valve cover comprises a bottom cover and a support, a filler cavity is formed in the bottom cover, filler is filled in the filler cavity, a gland is fixed on the support, and the gland abuts against the top of the filler; a sealing base is arranged in the filler cavity, the filler is arranged on the sealing base, the inner side wall of the sealing base is attached to the valve rod, the end, away from the filler, of the sealing base penetrates into the gate plate upper cavity, the end, penetrating into the gate plate upper cavity, of the sealing base is connected with a sealing conical pad, and the inner side wall of the sealing conical pad is attached to the outer wall of the valve rod; a connecting base is fixed to the top of the gate plate, and an inwards-sunken conical groove matched with the sealing conical pad is formed in the end, away from the gate plate, of the connecting base. The sealing performance between the valve rod and the valve cover can be effectively improved, and the possibility that a fluid medium leaks from a gap between the filler and the valve rod is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a leak-proof and wear-resistant valve mechanism. Background Art

[0002] A gate valve is a type of valve. The gate valve's opening and closing parts are gates. The gate's movement direction is perpendicular to the fluid direction. The gate valve can only be fully opened or fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The commonly used gate sealing mode is that the two sealing surfaces form a wedge shape, and the wedge angle varies with the valve parameters.

[0003] The existing gate valve mainly includes a valve body, a gate, a valve cover, a hand wheel and a valve stem. The valve stem is inserted into the valve body and the valve cover. The gate is located in the valve body. The bottom end of the valve stem is connected to the gate. The gate is driven up and down by turning the hand wheel to control the opening and closing of the gate valve. A packing is arranged between the valve stem and the valve cover to prevent the fluid medium from leaking from the gap between the valve stem and the valve cover.

[0004] In view of the above-mentioned prior art, the inventor believes that when the staff opens the valve, the gate plate moves upward by rotating the valve stem, and a gap is easily generated between the valve stem and the packing due to rotational friction, and then the fluid medium is easily leaked from the gap between the valve stem and the packing. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a leak-proof and wear-resistant valve mechanism, which can improve the sealing between the valve stem and the valve cover and reduce the possibility of leakage of the fluid medium from the gap between the packing and the valve stem.

[0006] The utility model solves the technical problem by adopting the following technical solution: a leak-proof and wear-resistant valve mechanism, comprising a valve body, a gate, a hand wheel, a valve cover connected to the valve body, and a valve stem inserted into the valve body and the valve cover, wherein the gate is located in the valve body, the two ends of the valve stem are respectively connected to the hand wheel and the gate, the valve stem is threadedly connected to the valve cover, the valve cover comprises a bottom cover and a bracket, the bottom cover is connected to the valve body, the bracket is fixed to a side of the bottom cover away from the valve body, a packing cavity and a gate upper cavity for accommodating the gate are formed in the bottom cover, the packing cavity is filled with packing, a pressure cover is fixed on the bracket, and the pressure cover abuts against the top of the packing;

[0007] A sealing base is provided inside the packing cavity, the packing is placed on the sealing base, the inner side wall of the sealing base is in contact with the valve stem, one end of the sealing base away from the packing penetrates into the inner side of the gate plate, and one end of the sealing base penetrating into the inner side of the gate plate is connected with a sealing cone gasket, and the inner side wall of the sealing cone gasket is in contact with the outer side wall of the valve stem;

[0008] A connecting seat is fixed on the top of the gate plate, and the valve stem is rotatably connected to the connecting seat. An inwardly recessed conical groove adapted to the sealing cone gasket is formed at one end of the connecting seat away from the gate plate; when the gate plate moves upward to an open valve state, the inner wall of the conical groove abuts against the sealing cone gasket.

[0009] Furthermore, a groove for inserting the sealing base is provided at one end of the sealing cone gasket close to the sealing base, the outer wall of the sealing base is threadedly connected to the inner wall of the groove, and the rotation direction of the valve stem when opening the gate valve is the same as the tightening direction of the sealing cone gasket.

[0010] Furthermore, a first sealing ring gasket is fixed on the edges of the two sealing surfaces of the gate plate, and a second sealing ring gasket adapted to the first sealing ring gasket is correspondingly fixed on the side wall of the valve body close to the gate plate; when the gate plate moves downward to close the gate plate, the first sealing ring gasket and the second sealing ring gasket are tightly attached to each other.

[0011] Furthermore, the valve body is formed with a flow channel cavity and a gate lower cavity for accommodating the gate, and the gate lower cavity and the gate upper cavity form a complete gate cavity.

[0012] Furthermore, a sealing bottom gasket is provided at the bottom of the flow channel cavity, and the sealing bottom gasket is located between the two second sealing ring gaskets and at the bottom of the gate plate; when the gate plate closes the gate valve, the bottom of the gate plate is tightly pressed against the sealing bottom gasket.

[0013] Furthermore, an annular groove is formed on the outer peripheral surface of the gate plate, and a sealing protrusion adapted to the annular groove is formed on the surface of the sealing base gasket close to the gate plate.

[0014] Beneficial effects of the utility model:

[0015] The utility model discloses a leak-proof and wear-resistant valve mechanism, which can effectively improve the sealing performance between the valve stem and the valve cover when the gate valve is closed through the dual effects of the sealing cone gasket and the sealing base; when the valve stem is rotated to drive the gate plate to move up to open the gate valve, the inner cone surface of the cone groove of the connecting seat and the sealing cone gasket are tightly fitted, and the connecting seat itself exerts pressure on the sealing cone gasket while playing an auxiliary sealing role, so that the sealing cone gasket can be tightly attached to the outer peripheral surface of the valve stem, further improving the sealing performance between the valve stem and the valve cover, and reducing the possibility of leakage of the fluid medium from the gap between the packing and the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural sectional view of the utility model when the valve is opened.

[0017] Figure 2 It is a structural sectional view of the utility model when the valve is closed.

[0018] Figure 3 yes Figure 1 A partial enlarged view of area A in the middle.

[0019] Figure 4 yes Figure 2 A partial enlarged view of area B in the middle.

[0020] In the figure: 1. valve body; 11. second sealing ring gasket; 12. flow channel cavity; 13. gate lower cavity; 14. sealing bottom gasket; 15. sealing protrusion; 2. gate; 21. connecting seat; 22. cone groove; 23. first sealing ring gasket; 3. handwheel; 4. valve cover; 41. bottom cover; 42. bracket; 43. packing; 44. pressure cover; 45. sealing base; 46. sealing cone gasket; 461. groove; 47. gate upper cavity; 5. valve stem. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below with reference to the accompanying drawings.

[0022] The utility model discloses a leak-proof and wear-resistant valve mechanism.

[0023] Reference Figures 1 to 3 A leak-proof and wear-resistant valve mechanism comprises a valve body 1, a gate plate 2, a hand wheel 3, a valve cover 4 and a valve stem 5. The valve body 1 is fixedly connected to the valve cover 4 by bolts. The valve stem 5 is passed through the valve body 1 and the valve cover 4. The gate plate 2 is located inside the gate valve. The bottom end of the valve stem 5 is rotatably connected to the gate plate 2, and the top end is fixedly connected to the hand wheel 3. The valve stem 5 is threadedly connected to the valve cover 4. The gate plate 2 is driven to move in the valve body 1 and the valve cover 4 by rotating the valve cover 4 to realize the opening and closing of the gate valve.

[0024] Reference Figures 1 to 3 The valve cover 4 includes a bottom cover 41 and a bracket 42, wherein the bottom cover 41 is bolted to the valve body 1, and the bracket 42 is fixed to the side of the bottom cover 41 away from the valve body 1. A packing cavity and a gate upper cavity 47 for accommodating the gate 2 are formed in the bottom cover 41, and the packing cavity is filled with packing 43. A pressure cover 44 is installed on the bracket 42, and the bottom end of the pressure cover 44 penetrates into the packing cavity and abuts against the top of the packing 43.

[0025] Reference Figures 1 to 3In order to improve the sealing performance between the valve stem 5 and the valve cover 4 and prevent the fluid medium from leaking from the gap between the packing 43 and the valve stem 5, a sealing base 45 is provided inside the packing cavity. In this embodiment, the sealing base 45 is made of nitrile rubber. The packing 43 is placed on the sealing base 45, the inner wall of the sealing base 45 is in contact with the valve stem 5, the end of the sealing base 45 away from the packing 43 penetrates into the gate plate upper cavity 47, and the end of the sealing base 45 penetrating into the gate plate cavity 47 is connected with a sealing cone pad 46. In this embodiment, the sealing cone pad 46 is made of polyurethane rubber, and the inner wall of the sealing cone pad 46 is in contact with the outer wall of the valve stem 5. A connecting seat 21 is fixed on the top of the gate plate 2, and the valve stem 5 is rotatably connected to the connecting seat 21. The end of the connecting seat 21 away from the gate plate 2 is formed with an inwardly concave cone groove 22 adapted to the sealing cone pad 46; when the gate plate 2 moves upward to the valve opening state, the inner wall of the cone groove 22 abuts against the sealing cone pad 46.

[0026] Under the dual effects of the sealing cone gasket 46 and the sealing base 45, the sealing performance between the valve stem 5 and the valve cover 4 can be effectively improved when the gate valve is closed. When the valve stem 5 is rotated to drive the gate plate 2 to move upward to open the gate valve, the inner conical surface of the conical groove 22 of the connecting seat 21 fits tightly against the sealing cone gasket 46. While the connecting seat 21 itself plays an auxiliary sealing role, it also applies pressure to the sealing cone gasket 46, so that the sealing cone gasket 46 can be tightly attached to the outer peripheral surface of the valve stem 5, further improving the sealing performance between the valve stem 5 and the valve cover 4, and reducing the possibility of leakage of the fluid medium from the gap between the packing 43 and the valve stem 5.

[0027] Reference Figures 1 to 3 In addition, a groove 461 for inserting the sealing base 45 is provided at one end of the sealing cone gasket 46 close to the sealing base 45, and the outer wall of the sealing base 45 is threadedly connected to the inner wall of the groove 461, and the rotation direction of the valve stem 5 when the gate valve is opened is the same as the tightening direction of the sealing cone gasket 46. The threaded connection between the sealing cone gasket 46 and the sealing base 45 facilitates the disassembly, assembly and replacement of the sealing cone gasket 46 to ensure the sealing performance of the sealing cone gasket 46, and the rotation direction of the valve stem 5 when the gate valve is opened is the same as the tightening direction of the sealing cone gasket 46, and when the gate valve is opened, the connection between the sealing cone gasket 46 and the sealing base 45 can be made tighter, thereby improving the sealing effect of the sealing cone gasket 46 and the sealing base 45 on the valve stem 5 and the valve cover 4.

[0028] Reference Figures 2 to 4 The valve body 1 is formed with a flow channel cavity 12 and a gate lower cavity 13 for accommodating the gate. The gate lower cavity 13 and the gate upper cavity 47 form a complete gate cavity. The edges of the two sealing surfaces of the gate 2 are fixed with a first sealing ring gasket 23. The sealing surface of the gate 2 is a wedge-shaped surface. The side wall of the valve body 1 close to the gate 2 is correspondingly fixed with a second sealing ring gasket 11 adapted to the first sealing ring gasket 23; when the gate 2 moves downward to close the gate 2, the first sealing ring gasket 23 and the second sealing ring gasket 11 are in close contact with each other.

[0029] A sealing bottom gasket 14 is provided at the bottom of the flow channel cavity 12. The sealing bottom gasket 14 is located between the two second sealing ring gaskets 11 and at the bottom of the gate plate 2. When the gate plate 2 closes the gate valve, the bottom of the gate plate 2 is pressed against the sealing bottom gasket 14. An annular groove is provided on the outer peripheral surface of the gate plate 2, and a sealing protrusion 15 adapted to the annular groove is formed on the surface of the sealing bottom gasket 14 close to the gate plate 2. The setting of the sealing bottom gasket 14 can provide a sealing effect between the bottom of the gate plate 2 and the valve body 1, and the setting of the sealing protrusion 15 and the annular groove can extend the sealing path, thereby improving the sealing performance of the sealing bottom gasket 14.

[0030] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A leakproof and wear-resistant valve mechanism, comprising a valve body (1), a gate plate (2), a hand wheel (3), a valve cover (4) connected to the valve body (1), and a valve stem (5) inserted into the valve body (1) and the valve cover (4), wherein the gate plate (2) is located in the valve body (1), two ends of the valve stem (5) are respectively connected to the hand wheel (3) and the gate plate (2), and the valve stem (5) is threadedly connected to the valve cover (4). Features: The valve cover (4) comprises a bottom cover (41) and a bracket (42), wherein the bottom cover (41) is connected to the valve body (1), and the bracket (42) is fixed to a side of the bottom cover (41) away from the valve body (1), wherein a packing cavity and a gate upper cavity (47) for accommodating the gate (2) are formed in the bottom cover (41), wherein the packing cavity is filled with a packing (43), and a pressure cover (44) is fixed to the bracket (42), wherein the pressure cover (44) abuts against the top of the packing (43); A sealing base (45) is provided inside the stuffing cavity, the stuffing (43) is placed on the sealing base (45), the inner wall of the sealing base (45) is in contact with the valve stem (5), the end of the sealing base (45) away from the stuffing (43) penetrates into the gate plate upper cavity (47), the end of the sealing base (45) penetrating into the gate plate upper cavity (47) is connected to a sealing cone gasket (46), and the inner wall of the sealing cone gasket (46) is in contact with the outer wall of the valve stem (5); A connecting seat (21) is fixed on the top of the gate plate (2), and the valve stem (5) is rotatably connected to the connecting seat (21). An inwardly recessed conical groove (22) adapted to the sealing conical gasket (46) is formed at one end of the connecting seat (21) away from the gate plate (2); when the gate plate (2) moves upward to an open valve state, the inner wall of the conical groove (22) abuts against the sealing conical gasket (46).

2. A leak-proof and wear-resistant valve mechanism according to claim 1, Features: The sealing cone gasket (46) is provided with a groove (461) for inserting the sealing base (45) at one end close to the sealing base (45); the outer wall of the sealing base (45) is threadedly connected to the inner wall of the groove (461); and the rotation direction of the valve stem (5) when opening the gate valve is the same as the tightening direction of the sealing cone gasket (46).

3. A leak-proof and wear-resistant valve mechanism according to claim 1, Features: A first sealing ring gasket (23) is fixed to the edges of the two sealing surfaces of the gate plate (2), and a second sealing ring gasket (11) adapted to the first sealing ring gasket (23) is correspondingly fixed to the side wall of the valve body (1) close to the gate plate (2); when the gate plate (2) moves downward to close the gate plate (2), the first sealing ring gasket (23) and the second sealing ring gasket (11) are in close contact with each other.

4. A leak-proof and wear-resistant valve mechanism according to claim 3, Features: The valve body (1) is formed with a flow channel cavity (12) and a gate lower cavity (13) for accommodating a gate, and the gate lower cavity (13) and the gate upper cavity (47) form a complete gate cavity.

5. A leak-proof and wear-resistant valve mechanism according to claim 4, Features: A sealing bottom gasket (14) is provided at the bottom of the flow channel cavity (12); the sealing bottom gasket (14) is located between the two second sealing ring gaskets (11) and at the bottom of the gate plate (2); when the gate plate (2) closes the gate valve, the bottom of the gate plate (2) is tightly pressed against the sealing bottom gasket (14).

6. A leak-proof and wear-resistant valve mechanism according to claim 5, Features: The outer peripheral surface of the gate plate (2) is provided with an annular groove, and the surface of the sealing base gasket (14) close to the gate plate (2) is formed with a sealing protrusion (15) adapted to the annular groove.

Images