High pressure self-sealing gate valve

Abstract

The application discloses a high-pressure self-sealing gate valve, which comprises a valve seat and a valve core, a channel is arranged in the valve seat, a mounting seat which is perpendicular to the valve seat is arranged in the middle part of the valve seat, a mounting cavity is arranged in the mounting seat, the valve core comprises an upper core seat and a lower core seat, a first valve rod is connected to the upper core seat, a second valve rod is arranged on the lower core seat, a cover is arranged at the two ends of the mounting seat, a first driving element and a second driving element which are used for driving the first valve rod and the second valve rod to move are arranged on the two covers respectively, and a sealing sleeve is arranged on the two sides of the valve seat which correspond to the valve core, the upper core seat and the lower core seat are driven to move by the first valve rod and the second valve rod, the upper core seat and the lower core seat are cooperated with the inclined sleeve, the sealing property between the inclined sleeve and the upper core seat and the lower core seat is better under the action of fluid pressure, and therefore the high-pressure fluid environment can be applied.

Description

Technical Field

[0001] This invention discloses a high-pressure self-sealing gate valve, belonging to the field of valve technology. Background Technology

[0002] Valves are control components in fluid transport systems, with functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, or overflow pressure relief. Based on the different shapes of the valve core, valves can be classified into ball valves, butterfly valves, gate valves, cone valves, etc.

[0003] In actual production, appropriate valves can be selected according to usage requirements. When using valves in high-pressure fluids, the first consideration is the sealing performance of the valve core. Many factors affect the sealing performance of the valve core, such as the valve core's closing method, whether there is friction between the valve core and the valve seat, and the type of friction. However, the valve cores in existing valves all have a certain degree of wear. After a period of use, high-pressure fluids will leak, and the fluid cannot be completely blocked. Therefore, the valve core must be replaced. Taking a gate valve as an example, the two sides of the valve core and the valve seat are sealed by planar contact. When opening and closing the valve core, the wear on both sides is relatively large, and the planar fit is difficult to guarantee the sealing performance under high pressure. Therefore, a new gate valve needs to be designed to reduce the wear of the valve core while ensuring that the sealing performance between the valve core and the valve seat meets the requirements for high-pressure fluid use. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art and provide a high-pressure self-sealing gate valve.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: a high-pressure self-sealing gate valve, comprising a valve seat and a valve core, wherein the valve seat has a channel and a mounting seat perpendicular to the valve seat is provided in the middle, the mounting seat has a through mounting cavity, the valve core includes an upper core seat and a lower core seat, a first valve stem is connected to the upper core seat, and a second valve stem is provided on the lower core seat, both ends of the mounting seat are provided with caps, and the two caps are respectively provided with a first driving member and a second driving member for driving the first valve stem and the second valve stem, respectively, the valve seat is provided with sealing sleeves on both sides corresponding to the valve core, one end of the sealing sleeve is installed in the valve seat, and the other end extends into the mounting cavity and is provided with a flared inclined sleeve, the outer side of the inclined sleeve has a frustum surface that mates with the upper core seat and the lower core seat, the upper core seat and the lower core seat have horizontal sealing surfaces perpendicular to the first valve stem and the second valve stem, the horizontal sealing surfaces being located in the middle of the mounting cavity.

[0006] Preferably, an annular sleeve is fixedly provided on the outer side of the sealing sleeve, a spring is provided on one side of the annular sleeve, and a plugging sleeve is provided on the other side. The plugging sleeve is threadedly connected to the valve seat. A cavity for installing the spring is formed between the sealing sleeve and the valve seat. The spring is sleeved on the outer side of the sealing sleeve and applies a force against the plugging sleeve to the annular sleeve.

[0007] Preferably, the annular sleeve and the sealing sleeve are connected by a pin, and the sealing sleeve is provided with a plurality of arrayed mounting holes.

[0008] Preferably, an annular groove is provided on the frustum surface, and a rubber ring is provided in the annular groove.

[0009] Preferably, the upper core seat and the lower core seat are provided with spherical surfaces to expand the cavity volume between them and the inclined sleeve.

[0010] Preferably, the lower core seat is provided with a positioning post, and the upper core seat is provided with a positioning groove that cooperates with the positioning post.

[0011] Preferably, both sides of the upper core seat and the lower core seat are provided with protruding ridges, and the side wall of the mounting seat is provided with guide grooves that cooperate with the protruding ridges.

[0012] Compared with the prior art, the beneficial effects of the present invention are: By setting up an upper core seat, a lower core seat, and an inclined sleeve, when the upper core seat and the lower core seat are in contact and sealed, they rely on the frustum surface to cooperate with the inclined sleeve, thus closing the channel. The inclination direction of the frustum surface and the fluid flow direction in the channel form a reverse inclination seal. When the fluid pressure acts on the end face of the inclined sleeve, it can enhance the sealing performance between the inclined sleeve and the upper and lower core seats, thereby meeting the requirements of gate valves in high-pressure fluid environments. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a high-pressure self-sealing gate valve according to the present invention; Figure 2 This is a cross-sectional view of a high-pressure self-sealing gate valve according to the present invention; Figure 3 This is a schematic diagram of the structure of the upper core seat, lower core seat, and sealing sleeve in this invention; Figure 4 This is an exploded view of the sealing sleeve, annular sleeve, and plugging sleeve in this invention; Figure 5 for Figure 2 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the upper core seat in this invention; Figure 7 This is a schematic diagram of the lower core seat in this invention; Figure 8This is a schematic diagram of the valve seat structure in this invention; Reference numerals: 1. Channel; 2. Cover; 3. First drive element; 4. First valve stem; 5. Mounting seat; 6. Valve seat; 7. Second drive element; 8. Second valve stem; 9. Mounting cavity; 10. Spherical surface; 11. Sealing sleeve; 12. Lower core seat; 13. Cavity; 14. Sealing sleeve; 15. Inclined sleeve; 16. Upper core seat; 17. Raised ridge; 18. Spring; 19. Annular sleeve; 20. Frustum; 21. Annular groove; 22. Rubber ring; 23. Mounting hole; 24. Pin; 25. Positioning groove; 26. Positioning post; 27. Guide groove. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figures 1-8 As shown, a high-pressure self-sealing gate valve includes a valve seat 6 and a valve core. The valve seat 6 has a channel 1 for fluid passage and a mounting base 5 in the middle. The mounting base 5 is perpendicular to the valve seat 6 and extends to both sides. Both the mounting base 5 and the valve seat 6 are provided with flanges. The mounting base 5 has a through mounting cavity 9, in which the valve core is located. The mounting base 5 has caps 2 at both ends. The valve core is composed of an upper core seat 16 and a lower core seat 12, which abut against each other through a horizontal sealing surface located in the middle of the mounting cavity 9. The upper core seat 16 is fixedly connected to a first valve stem 4 by bolts. The end of the first valve stem 4 that passes through the cap 2 is provided with a first driving member 3. The lower core seat 12 is fixedly connected to a second valve stem 8 by bolts. The end of the second valve stem 8 that passes through the cap 2 is provided with a second driving member 7. Both the first driving member 3 and the second driving member 7 can be handwheels. By rotating the handwheel, the first valve stem 4 can drive the upper core seat 16 to move, and the second valve stem 8 can drive the lower core seat 12 to move.

[0016] Secondly, sealing sleeves 11 are provided on both sides of the valve seat 6 corresponding to the valve core. One end of the sealing sleeve 11 is slidably connected to the valve seat 6, and the other end extends into the mounting cavity 9 and is provided with an inclined sleeve 15. The inclined sleeve 15 has a flared structure and a frustum surface 20 is provided on its outer side. The frustum surface 20 can cooperate with the upper core seat 16 and the lower core seat 12. When the first valve stem 4 and the second valve stem 8 drive the upper core seat 16 and the lower core seat 12 to abut, the upper core seat 16, the lower core seat 12 and the inclined sleeve 15 can pass through the frustum surface 20 and the horizontal The sealing surface closes the channel 1. Because the inclination direction of the frustum surface 20's cross-section forms a reverse inclination seal with the fluid flow direction in channel 1, the possibility of fluid passing through the gap between the three is reduced. Furthermore, the sealing sleeve 11 can slide along the valve seat 6. Specifically, an annular sleeve 19 is fixedly installed on the outer side of the sealing sleeve 11. A spring 18 is installed on one side of the annular sleeve 19, and a sealing sleeve 14 is installed on the other side. The sealing sleeve 14 is threadedly connected to the valve seat 6, and a sealing sleeve 11 forms a seal with the valve seat 6. The valve has a cavity 13 for installing the spring 18. The spring 18 is sleeved on the outside of the sealing sleeve 11 and applies a force to the annular sleeve 19 against the sealing sleeve 14. At the same time, an annular groove 21 is provided on the frustum 20, and a rubber ring 22 is provided in the annular groove 21. The upper core seat 16 and the lower core seat 12 are provided with spherical surfaces 10 to expand the volume of the cavity between them and the inclined sleeve 15. When the fluid pressure in the channel 1 acts on the end face of the inclined sleeve 15 along the spherical surface 10, and there is a gap between the upper core seat 16 and the lower core seat 12 and the inclined sleeve 15, the fluid will push the sealing sleeve 11 to compress the spring 18 and move it a short distance, thereby increasing the compression of the rubber ring 22. The sealing performance between the three is enhanced, and a self-sealing effect is achieved. Especially when the fluid pressure is higher, the sealing performance is better. Thus, the valve can be used in high-pressure fluid environments. Moreover, the wear between the upper core seat 16, the lower core seat 12 and the inclined sleeve 15 is very small, and the service life is longer. Compared with traditional valves, it is more practical.

[0017] Mounting hole 23 allows for easy disassembly of the sealing sleeve 14 and the sealing sleeve 11. During assembly, the sealing sleeve 14 is first installed on the outside of the sealing sleeve 11. Then, the annular sleeve 19 and the sealing sleeve 11 are fixed using the pin 24. Next, the spring 18 is placed on the outside of the sealing sleeve 11. The entire assembly is then installed in the valve seat 6, and the sealing sleeve 14 is simply turned using the multiple mounting holes 23. To enable the upper core seat 16 and the lower core seat 12 to withstand greater fluid pressure, a positioning post 26 is provided on the lower core seat 12, and a positioning groove 25 that mates with the positioning post 26 is provided on the upper core seat 16. When the upper core seat 16 and the lower core seat 12 are in contact and sealing, The positioning pin 26 is inserted into the positioning groove 25, so that the first valve stem 4 and the second valve stem 8 can form two fulcrums to avoid the formation of a cantilever beam structure due to the lack of connection between the two, which would cause the first valve stem 4 and the second valve stem 8 to bend and deform. At the same time, both sides of the upper core seat 16 and the lower core seat 12 are provided with protruding ribs 17, and the side wall of the mounting seat 5 is provided with guide grooves 27 that cooperate with the protruding ribs 17. The protruding ribs 17 are resisted by the guide grooves 27, which can transfer the force on the upper core seat 16 and the lower core seat 12 to the valve seat 6, further reducing the force on the first valve stem 4 and the second valve stem 8, thereby ensuring the service life of the components.

[0018] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-pressure self-sealing gate valve, comprising a valve seat (6) and a valve core, characterized in that, The valve seat (6) has a channel (1) and a mounting seat (5) perpendicular to the valve seat (6) in the middle. The mounting seat (5) has a through mounting cavity (9). The valve core includes an upper core seat (16) and a lower core seat (12). A first valve stem (4) is connected to the upper core seat (16), and a second valve stem (8) is provided on the lower core seat (12). Both ends of the mounting seat (5) are provided with caps (2). The two caps (2) are respectively provided with a first driving member (3) for driving the first valve stem (4) and the second valve stem (8). The valve seat (6) is provided with sealing sleeves (11) on both sides of the valve core. One end of the sealing sleeve (11) is installed in the valve seat (6), and the other end extends into the mounting cavity (9) and is provided with a horn-shaped inclined sleeve (15). The outer side of the inclined sleeve (15) has a frustum surface (20) that cooperates with the upper core seat (16) and the lower core seat (12). The upper core seat (16) and the lower core seat (12) have horizontal sealing surfaces that are perpendicular to the first valve stem (4) and the second valve stem (8). The horizontal sealing surfaces are located in the middle of the mounting cavity (9).

2. The high-pressure self-sealing gate valve according to claim 1, characterized in that, An annular sleeve (19) is fixedly provided on the outer side of the sealing sleeve (11). A spring (18) is provided on one side of the annular sleeve (19), and a plugging sleeve (14) is provided on the other side. The plugging sleeve (14) is threadedly connected to the valve seat (6). A cavity (13) for installing the spring (18) is formed between the sealing sleeve (11) and the valve seat (6). The spring (18) is sleeved on the outer side of the sealing sleeve (11) and applies a force to the annular sleeve (19) against the plugging sleeve (14).

3. A high-pressure self-sealing gate valve according to claim 2, characterized in that, The annular sleeve (19) and the sealing sleeve (11) are connected by a pin (24), and the sealing sleeve (14) is provided with a plurality of arrayed mounting holes (23).

4. A high-pressure self-sealing gate valve according to claim 1, characterized in that, An annular groove (21) is provided on the frustum (20), and a rubber ring (22) is provided in the annular groove (21).

5. A high-pressure self-sealing gate valve according to claim 4, characterized in that, The upper core seat (16) and the lower core seat (12) are provided with spherical surfaces (10) for expanding the cavity volume between them and the inclined sleeve (15).

6. A high-pressure self-sealing gate valve according to claim 4, characterized in that, The lower core seat (12) is provided with a positioning post (26), and the upper core seat (16) is provided with a positioning groove (25) that cooperates with the positioning post (26).

7. A high-pressure self-sealing gate valve according to claim 1, characterized in that, Both sides of the upper core seat (16) and the lower core seat (12) are provided with protruding ribs (17), and the side wall of the mounting base (5) is provided with guide grooves (27) that cooperate with the protruding ribs (17).

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