A high sealing gate valve

Abstract

The present invention discloses a high-sealing gate valve, the technical scheme of which includes a valve body and a valve stem, a valve plate mechanism is connected to the extending end of the valve stem, the valve plate mechanism includes a support frame, a first valve plate and a second valve plate, the support frame includes a long plate and a short plate, the first valve plate and the second valve plate are obliquely arranged between the long plate and the short plate and are located on both sides of the support frame, the first valve plate and the second valve plate are both slidably connected to the long plate and the short plate; the valve stem passes through the support frame and extends between the first valve plate and the second valve plate, and an adjusting component is arranged at the end, the adjusting component can push the first valve plate and the second valve plate to open to both sides of the support frame; the valve stem includes a main valve stem and an adjusting valve stem, the main valve stem is threadedly connected to the valve body, the interior of the main valve stem is hollow, the adjusting valve stem is arranged inside the main valve stem and can rotate, the present invention has the function of adjusting the inclination angle of the valve plate during use, plays the function of compensating for the different wear amounts at the upper and lower ends of the sealing surface, and effectively improves the sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and more particularly to a high-sealing gate valve. Background Art

[0002] Gate valves are currently the most important type of valves, which are widely used for the circulation and shutoff of liquids, gases, dust and other media. Usually, a gate valve includes a valve body, the lower part of which has a feed port and a discharge port, and the left end of the feed port and the right end of the discharge port both have sealing surfaces, and a valve plate that can move up and down and does not rotate is provided between the two sealing surfaces in a dynamic seal. At the same time, a valve stem is connected to the upper part of the valve plate, and a handle is connected to the upper part of the valve stem through a screw nut mechanism. After the handle rotates, the valve stem is driven to move up and down by the screw nut mechanism, and then the valve plate moves up and down to seal or open the two sealing inclined surfaces, and finally the feed port and the discharge port are connected or shutoff.

[0003] At present, with the development of gate valve technology, in order to maintain better sealing, manufacturers prepare both sealing surfaces as inclined surfaces. Correspondingly, the valve plate is prepared as a wedge with the small end at the bottom, thereby greatly improving the sealing effect of the gate valve.

[0004] However, even after adopting the above-mentioned improvements, the gate valve still has the following defects: the valve plate will wear out after long-term use, so that the inclination of the valve plate and the sealing slope changes, and then the sealing effect is greatly reduced. Double-valve plate gate valves have also appeared in the prior art. The two valve plates are stretched outward by structures such as springs or spring plates to achieve the seal between the valve plate and the valve seat. However, the elastic force of the spring and the spring plate will gradually disappear over time, which will also cause the seal between the valve plate and the valve seat to become unstable; in addition, the upper and lower ends of the wedge-shaped valve plate have different diameters, resulting in different changes in the inclination of the upper and lower ends of the wedge-shaped valve plate and the sealing slope after contact with the valve seat. The two valve plates of the existing double-valve plate gate valve are stretched outward in parallel by springs or springs to compensate for the wear, which will inevitably lead to insufficient compensation between the two sealing surfaces, resulting in the sealing performance failing to meet the requirements. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high-sealing gate valve, which has the function of adjusting the inclination angle of the valve plate during use, thereby compensating for the different wear amounts at the upper and lower ends of the sealing surface and effectively improving the sealing performance.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-sealing gate valve, comprising a valve body and a valve stem, characterized in that: a valve plate mechanism for closing and opening a fluid channel inside the valve body is connected to the protruding end of the valve stem, the valve plate mechanism comprises a support frame, a first valve plate and a second valve plate, the support frame comprises a long plate and a short plate, the first valve plate and the second valve plate are obliquely arranged between the long plate and the short plate and are located on both sides of the support frame, and the first valve plate and the second valve plate are both slidably connected to the long plate and the short plate; the valve stem passes through the support frame and extends between the first valve plate and the second valve plate, and an adjustment component is arranged at the end of the valve stem, the adjustment component can slide up and down, and can push the first valve plate and the second valve plate to open to both sides of the support frame; the valve stem comprises a main valve stem and a regulating valve stem, the main valve stem is threadedly connected to the valve body, the interior of the main valve stem is hollow, the regulating valve stem is arranged inside the main valve stem and can rotate, the outer end of the main valve stem is provided with a large handwheel, and the outer end of the regulating valve stem is provided with a small handwheel.

[0007] The present invention is further configured as follows: the adjusting assembly includes a first adjusting part and a second adjusting part, the first adjusting part is rotatably connected to the main valve stem, a threaded hole is provided on the first adjusting part, the adjusting valve stem extends through the threaded hole and is threadedly connected to the threaded hole, and the end of the adjusting valve stem is rotatably connected to the second adjusting part.

[0008] The present invention is further configured as follows: slots are provided on the long plate and the short plate, the first valve plate and the second valve plate can slide in the direction of the slots, limiting holes are provided on the side walls of the slots, the ends of the first valve plate and the second valve plate are both slidable and hinged to the limiting rods, the limiting rods extend into the limiting holes and slide in cooperation with the limiting holes, a reset spring is sleeved on the limiting rods, and the reset spring abuts against the end of the limiting rods and the inner wall of the limiting hole.

[0009] The present invention is further configured such that: the first adjusting portion and the second adjusting portion are cylindrical structures, and the diameter of the first adjusting portion is greater than the diameter of the second adjusting portion.

[0010] The present invention is further configured as follows: the first valve plate and the second valve plate are configured in a "V"-shaped structure.

[0011] The present invention is further configured as follows: a valve cavity is provided in the valve body, the valve cavity is located in the middle of the fluid channel inside the valve body, the two sides of the valve cavity are connected to the fluid channel, and sealing surfaces are provided, the sealing surfaces on both sides are inclined and correspond to the inclination directions of the first valve plate and the second valve plate respectively.

[0012] The present invention is further configured such that soft seals are arranged on the sealing surfaces of the first valve plate, the second valve plate and both sides of the valve cavity.

[0013] In summary, the present invention has the following beneficial effects:

[0014] The present invention is provided with a valve plate mechanism that can adjust the valve plate to move to both sides, the first valve plate and the second valve plate on the valve plate mechanism can slide on the support frame, and the main valve stem and the regulating valve stem are provided on the valve stem, wherein the main valve stem can drive the first regulating part to move up and down, and at the same time, under the action of the first regulating part, the valve plate mechanism is also driven to move up and down, when the valve plate mechanism moves to the bottom, the main valve stem is rotated again at this time, and the first regulating part is driven by the main valve stem to separate from the long plate and continue to move to the side of the short plate, during the movement, the circumferential surface of the first regulating part of the cylindrical structure is against the first valve plate and the second valve plate, and gradually the first valve plate and the second valve plate are stretched to both sides, so that the first valve The plate, the second valve plate and the sealing surface are tightly attached together; when the main valve stem cannot rotate, the regulating valve stem is rotated again. Since the regulating valve stem is threadedly connected to the first regulating part, the first regulating part cannot rotate under the restriction of the first and second valve plates. Therefore, the regulating valve stem will naturally drive the second regulating part to approach the short plate. Based on the same structure as the first regulating part, the second regulating part will also expand the first valve plate and the second valve plate to both sides, so that the position where the first valve plate and the second valve plate contact the upper edge of the sealing surface is expanded by the first regulating part, and the position where they contact the lower edge of the sealing surface is expanded by the second regulating part, and the expansion amount can be independently controlled according to the positions of the first regulating part and the second regulating part.

[0015] Compared with the prior art, the present invention can not only adjust the amount of expansion between the first valve plate and the second valve plate to compensate for the wear when dealing with wear on the valve plate and the sealing surface, but also because the first adjustment part and the second adjustment part are independently controlled, it can also compensate for different wear amounts at upper and lower positions, that is, by changing the spacing between the first adjustment part and the second adjustment part, the inclination angle of the valve plate can also be adjusted, which solves the problem in the prior art that the inclination of the sealing surface changes but cannot be adaptively compensated, and can significantly improve the sealing performance of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional view of the internal structure of the valve body of this embodiment;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure at point A;

[0018] Figure 3 yes Figure 2 A magnified schematic diagram of the structure at B;

[0019] Figure 4 It is a schematic diagram of the partial structure of the valve plate mechanism of this embodiment.

[0020] Figure numerals: 1. valve body; 2. valve stem; 201. main valve stem; 202. adjusting valve stem; 3. valve plate mechanism; 301. first valve plate; 302. second valve plate; 4. support frame; 401. long plate; 402. short plate; 5. adjusting assembly; 501. first adjusting part; 502. second adjusting part; 6. threaded hole; 7. notch; 8. limiting hole; 9. limiting rod; 10. valve chamber; 11. sealing surface; 1101. upper edge of sealing surface; 1102. lower edge of sealing surface; 13. large handwheel; 14. small handwheel; 15. reset spring. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0022] This embodiment discloses a high sealing gate valve, such as Figure 1-4 As shown, it includes a valve body 1 and a valve stem 2. The extended end of the valve stem 2 is connected with a valve plate mechanism 3 for closing and opening the fluid channel inside the valve body. The valve plate mechanism 3 includes a support frame 4, a first valve plate 301 and a second valve plate 302. The support frame 4 includes a long plate 401 and a short plate 402. Figure 4 The first valve plate 301 and the second valve plate 302 are inclinedly arranged between the long plate 401 and the short plate 402 and are located on both sides of the support frame 4. The specific inclination direction is wide at the top and narrow at the bottom, and is arranged in a "V" shape. The first valve plate 301 and the second valve plate 302 are both slidably connected with the long plate 401 and the short plate 402; specifically, the long plate 401 and the short plate 402 are both provided with a notch 7, and the first valve plate 301 and the second valve plate 302 can slide in the direction of the notch 7. A limiting hole 8 is provided on the side wall of the notch 7. The ends of the first valve plate 301 and the second valve plate 302 are both slidable and hinged with a limiting rod 9, which extends into the limiting hole 8 and slidably cooperates with the limiting hole 8. Through the above structure, the first valve plate 301 and the second valve plate 302 can be expanded outward on the support frame 4, and can be retracted inward, see Figure 3 A return spring 15 is sleeved on the limit rod 9, and the return spring 15 abuts against the end of the limit rod 9 and the inner wall of the limit hole 8. The return spring 15 is used to reset the first valve plate 301 and the second valve plate 302. When the first valve plate 301 and the second valve plate 302 are in a state of being stretched outward, the return spring 15 contracts and deforms and stores energy, so that when the first valve plate 301 and the second valve plate 302 are released from the stretched state, the return spring 15 will drive the first valve plate 301 and the second valve plate 302 to return to the initial state.

[0023] Furthermore, the valve stem 2 passes through the support frame 4 and extends between the first valve plate 301 and the second valve plate 302, and an adjusting component 5 is arranged at the end of the valve stem 2, and the adjusting component 5 can slide up and down and can push the first valve plate 301 and the second valve plate 302 to open to both sides of the support frame 4. The valve stem 2 includes a main valve stem 201 and an adjusting valve stem 202, the main valve stem 201 is threadedly connected to the valve body 1, the interior of the main valve stem 201 is hollow, and the adjusting valve stem 202 is arranged on the main valve stem 201. The main valve stem 201 is internally and rotatable, a large handwheel 13 is provided at the outer end of the main valve stem 201, and a small handwheel 14 is provided at the outer end of the regulating valve stem 202; the regulating assembly 5 includes a first regulating portion 501 and a second regulating portion 502, the first regulating portion 501 is rotatably connected to the main valve stem 201, a threaded hole 6 is provided on the first regulating portion 501, the regulating valve stem 202 extends through the threaded hole 6 and is threadedly connected to the threaded hole 6, and the end of the regulating valve stem 202 is rotatably connected to the second regulating portion 502. By rotating the large handwheel 13, the main valve stem 201 can be driven to rotate. Since the main valve stem 201 is threadedly connected to the valve body 1, the main valve stem 201 can move up and down, and drive the first adjusting part 501 rotatably connected to the main valve stem 201 to move up and down synchronously. A threaded hole 6 is provided on the first adjusting part 501, and the threaded hole 6 is threadedly connected to the regulating valve stem 202. When there is no external force driving the regulating valve stem 202 to rotate, the regulating valve stem 202 also moves up and down with the main valve stem 201. During the up and down movement of the first adjusting part 501, it will abut against the support frame 4, thereby realizing the up and down movement of the valve plate mechanism 3.

[0024] For further information, see Figure 4The first adjusting portion 501 and the second adjusting portion 502 are cylindrical structures, and the diameter of the first adjusting portion 501 is larger than the diameter of the second adjusting portion 502. A valve cavity 10 is arranged in the valve body 1, and the valve cavity 10 is located in the middle of the fluid channel inside the valve body 1. Both sides of the valve cavity 10 are connected to the fluid channel and are provided with sealing surfaces 11. The sealing surfaces 11 on both sides are inclined and correspond to the inclination directions of the first valve plate 301 and the second valve plate 302 respectively. After the support frame 4 reaches the bottom of the valve cavity 10, that is, after the short plate 402 contacts the bottom, when the main valve stem 201 is rotated to drive the first adjusting portion 501 to descend, the first valve plate 301 and the second valve plate 302 will abut against the outer circumferential surface of the first adjusting portion 501, and as the first adjusting portion 501 continues to descend, the first valve plate 301 and the second valve plate 302 are gradually stretched to both sides, and finally firmly abut against the sealing surfaces 11 on both sides of the valve cavity 10. After long-term use, since the valve plate is tilted and its upper and lower ends have different diameters, the wear amounts of the upper and lower parts of the valve plate and the sealing surface are different after contacting the sealing surface. Therefore, the valve plate needs to adjust the tilt angle. At this time, it is only necessary to rotate the adjusting valve stem 202. Since it is threadedly connected to the threaded hole and the first adjusting part 501 cannot rotate, the second adjusting part 502 can move in the direction away from the first adjusting part 501. When the second adjusting part 502 is away from the first adjusting part 501, the lower side of the valve plate is stretched open, that is, the original tilt angles of the first valve plate 501 and the second valve plate 502 are changed, which can compensate for the different wear amounts of the upper edge 1101 of the sealing surface and the lower edge 1102 of the sealing surface, thereby improving the sealing effect.

[0025] Furthermore, soft seals are provided on the first valve plate 301, the second valve plate 302 and the sealing surfaces 11 on both sides of the valve cavity 10. The soft seals may be made of wear-resistant rubber material to improve the sealing performance.

[0026] 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 design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-sealing gate valve, comprising a valve body (1) and a valve stem (2), characterized in that: A valve plate mechanism (3) for closing and opening a fluid passage inside the valve body is connected to the protruding end of the valve stem (2); the valve plate mechanism (3) comprises a support frame (4), a first valve plate (301) and a second valve plate (302); the support frame (4) comprises a long plate (401) and a short plate (402); the first valve plate (301) and the second valve plate (302) are arranged obliquely between the long plate (401) and the short plate (402) and are located on both sides of the support frame (4); the first valve plate (301) and the second valve plate (302) are both slidably connected to the long plate (401) and the short plate (402); the valve stem (2) passes through the support frame (4) and protrudes into the first valve plate (301). An adjusting component (5) is arranged between the first valve plate (301) and the second valve plate (302) and at the end of the valve stem (2); the adjusting component (5) can slide up and down and can push the first valve plate (301) and the second valve plate (302) to open toward the two sides of the support frame (4); the valve stem (2) comprises a main valve stem (201) and an adjusting valve stem (202); the main valve stem (201) is threadedly connected to the valve body (1); the main valve stem (201) is hollow inside; the adjusting valve stem (202) is arranged inside the main valve stem (201) and can rotate; a large hand wheel (13) is arranged at the outer end of the main valve stem (201); and a small hand wheel (14) is arranged at the outer end of the adjusting valve stem (202); The regulating assembly (5) comprises a first regulating portion (501) and a second regulating portion (502); the first regulating portion (501) is rotatably connected to the main valve stem (201); a threaded hole (6) is provided on the first regulating portion (501); the regulating valve stem (202) extends through the threaded hole (6) and is threadedly connected to the threaded hole (6); the end of the regulating valve stem (202) is rotatably connected to the second regulating portion (502); The long plate (401) and the short plate (402) are both provided with a slot (7), the first valve plate (301) and the second valve plate (302) can slide in the direction of the slot (7), a limiting hole (8) is provided on the side wall of the slot (7), the ends of the first valve plate (301) and the second valve plate (302) are both slidable and hinged with a limiting rod (9), the limiting rod (9) extends into the limiting hole (8) and slidably cooperates with the limiting hole (8), a return spring (15) is sleeved on the limiting rod (9), and the return spring (15) abuts against the end of the limiting rod (9) and the inner wall of the limiting hole (8).

2. A high sealing gate valve according to claim 1, characterized in that: The first adjusting portion (501) and the second adjusting portion (502) are cylindrical structures, and the diameter of the first adjusting portion (501) is greater than the diameter of the second adjusting portion (502).

3. A high sealing gate valve according to claim 1, characterized in that: The first valve plate (301) and the second valve plate (302) are arranged in a "V"-shaped structure.

4. A high sealing gate valve according to claim 1, characterized in that: A valve cavity (10) is provided in the valve body (1), and the valve cavity (10) is located in the middle of the fluid channel inside the valve body (1). Both sides of the valve cavity (10) are connected to the fluid channel and are provided with sealing surfaces (11). The sealing surfaces (11) on both sides are arranged inclined and correspond to the inclination directions of the first valve plate (301) and the second valve plate (302), respectively.

5. A high sealing gate valve according to claim 4, characterized in that: Soft sealing components are provided on the first valve plate (301), the second valve plate (302) and the sealing surfaces (11) on both sides of the valve chamber (10).

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