High parameter power plant use drain stop valve

Abstract

The utility model relates to the technical field of stop valve, concretely is the drain stop valve for high parameter power station, including the valve body, its top end is fixedly installed with the valve cover through the bolt, and the middle part of valve cover and valve body is provided with the opening and closing mechanism, the valve seat is fixedly connected in the middle part of the inside of valve body, and the cut -off mechanism is provided between the valve seat and opening and closing mechanism. The utility model discloses the cooperation of pressure self -compensation sealing structure, when medium pressure rises, greater radial compression deformation is produced to O ring under the pressure effect, and sealing specific pressure is along with system pressure automatic increase, ensures that can maintain reliable sealing under different working conditions.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a high-parameter power plant condensate gate valve. Background Technology

[0002] In modern large-scale power plant systems, steam traps are critical equipment for ensuring the safe operation of steam pipeline systems. With continuously increasing power plant parameters, modern supercritical and ultra-supercritical units operate at pressures of 25-31 MPa and temperatures exceeding 600°C. Under these extreme conditions, steam traps require extremely high sealing performance and reliability. Especially during unit start-up and shutdown, load changes, and other operational variations, the valves must be able to withstand severe pressure fluctuations and temperature shocks.

[0003] Currently, conventional power plant drain valves generally adopt a single-stage sealing structure. When the system pressure suddenly increases, the traditional rigid sealing structure cannot automatically adjust the sealing pressure, which makes the sealing surface prone to leakage. When the pressure decreases, the seal is too tight, which can cause jamming. This defect is particularly prominent under high-parameter operating conditions, which seriously affects the safe and stable operation of the power plant. Utility Model Content

[0004] The purpose of this invention is to provide a high-parameter power plant drain shut-off valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] High-parameter power plant drain shut-off valves, including

[0007] The valve body has a valve cover fixedly installed at its top by bolts, and an opening and closing mechanism is provided in the middle of the valve cover and the valve body.

[0008] A valve seat is fixedly connected to the inner middle part of the valve body, and a flow-stopping mechanism is provided between the valve seat and the opening and closing mechanism.

[0009] Preferably, the opening and closing mechanism includes a threaded rod rotatably connected to the middle of the valve cover via a bearing, and a rectangular valve rod threaded to the outside of the threaded rod. The outer wall of the rectangular valve rod is intermittently fitted with the middle inner wall of the valve body and the valve cover. The top end of the threaded rod extends to the outside of the valve cover and is fixedly connected to a handwheel.

[0010] Preferably, the flow-stopping mechanism includes an upper sealing plate fixedly connected to the bottom end of a rectangular valve stem, and a sealing groove annularly formed on the upper end of the valve seat. A sealing ring matching the sealing groove is fixedly connected to the bottom end of the upper sealing plate.

[0011] Preferably, the flow-stopping mechanism further includes a sleeve vertically disposed at the middle of the bottom end of the upper sealing plate, and a movable block movably disposed inside the sleeve. The sleeve has symmetrical movable grooves on both sides of its bottom end, and a clamp is movably installed inside the movable groove. A clamping groove matching the clamp is provided on the inner wall of the bottom end of the valve seat. A connecting rod is provided between the clamp and the movable block, and the two ends of the connecting rod are respectively hinged to the movable block and the clamp.

[0012] Preferably, the interception mechanism further includes a vertical rod fixed to the middle of the top of the movable block, and guide grooves opened on both sides of the upper end of the inner wall of the sleeve. The top of the vertical rod is fixedly connected to the lower end face of the middle of the upper sealing plate. A spring is movably sleeved between the movable block and the upper sealing plate and outside the vertical rod. Guide blocks that are slidably connected to the guide grooves are fixedly connected on both sides of the top of the movable block. A corrugated sleeve is fixedly connected between the guide block and the upper sealing plate and outside the spring.

[0013] Preferably, a lower sealing plate is provided directly below the bottom end of the sleeve, and an O-ring is fixedly connected between the lower sealing plate and the outer periphery of the sleeve. A second vertical rod is fixedly connected to the middle of the top end of the lower sealing plate. A second spring is movably sleeved between the sleeve and the lower sealing plate and outside the second vertical rod. A vertical groove matching the second vertical rod is opened in the middle of the bottom end of the sleeve. A vertical limiting post is fixedly connected to the lower middle of the inner side of the valve body. The limiting post and the second vertical rod are on the same central axis.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This high-parameter power plant drain valve, through the use of a pressure self-compensating sealing structure, causes the O-ring to undergo greater radial compression deformation under pressure when the medium pressure increases, so that the sealing specific pressure automatically increases with the system pressure, ensuring that reliable sealing can be maintained under different operating conditions.

[0016] 2. This high-parameter power plant drain valve, through the cooperation of a mechanical interlocking mechanism, when the valve is closed, the mechanical locking of the clamp head and the clamp groove can resist the reverse impact of the medium pressure on the sealing structure. At the same time, the main sealing structure between the upper sealing plate and the valve seat remains in a fixed compression state. The two work together to ensure the sealing reliability of the valve under high pressure differential. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall main structure of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 For the present utility model Figure 1Enlarged diagram of point B in the middle.

[0020] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Threaded rod; 5. Rectangular valve stem; 6. Handwheel; 7. Upper sealing plate; 8. Sealing groove; 9. Sealing ring; 10. Sleeve; 11. Movable block; 12. Movable groove; 13. Snap-in head; 14. Snap-in groove; 15. Connecting rod; 16. Vertical rod one; 17. Guide groove; 18. Spring one; 19. Guide block; 20. Corrugated sleeve; 21. Lower sealing plate; 22. O-ring; 23. Vertical rod two; 24. Vertical groove; 25. Limiting post; 26. Spring two. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figure 1-3 As shown, this utility model provides a technical solution:

[0023] A high-parameter power plant drain shut-off valve includes a valve body 1, with a valve cover 2 bolted to its top. An opening / closing mechanism is located between the valve cover 2 and the valve body 1. This mechanism includes a threaded rod 4 rotatably connected to the middle of the valve cover 2 via a bearing, and a rectangular valve stem 5 threaded to the outside of the threaded rod 4. The outer wall of the rectangular valve stem 5 intermittently fits the inner wall of the valve body 1 and the middle of the valve cover 2. The top of the threaded rod 4 extends to the outside of the valve cover 2 and is fixedly connected to a handwheel 6. A valve seat 3 is fixedly connected to the inner middle of the valve body 1. A flow-stopping mechanism is provided between the valve seat 3 and the opening / closing mechanism to cut off the flow. The mechanism includes an upper sealing plate 7 fixedly connected to the bottom end of a rectangular valve stem 5, and a sealing groove 8 annularly formed on the upper end of a valve seat 3. A sealing ring 9 matching the sealing groove 8 is fixedly connected to the bottom end of the upper sealing plate 7. The flow-stopping mechanism also includes a sleeve 10 vertically arranged in the middle of the bottom end of the upper sealing plate 7, and a movable block 11 movably arranged inside the sleeve 10. Movable grooves 12 are symmetrically formed on both sides of the bottom end of the sleeve 10. A clamping head 13 is movably installed inside the movable groove 12. A clamping groove 14 matching the clamping head 13 is formed on the inner wall of the bottom end of the valve seat 3. A groove is provided between the clamping head 13 and the movable block 11. A connecting rod 15 is provided, with its two ends hinged to a movable block 11 and a locking head 13, respectively. The flow-stopping mechanism further includes a vertical rod 16 fixedly to the middle of the top of the movable block 11, and guide grooves 17 formed on both sides of the upper end of the inner wall of the sleeve 10. The top of the vertical rod 16 is fixedly connected to the lower end face of the middle of the upper sealing plate 7. A spring 18 is movably sleeved between the movable block 11 and the upper sealing plate 7 and outside the vertical rod 16. Guide blocks 19 are fixedly connected to both sides of the top of the movable block 11 and slidably connected to the guide grooves 17. A guide block 19 is slidably connected between the guide block 19 and the upper sealing plate 7 and outside the spring 18. A corrugated sleeve 20 is fixedly connected to the outside of the sleeve 10. A lower sealing plate 21 is provided directly below the bottom end of the sleeve 10. An O-ring 22 is fixedly connected between the lower sealing plate 21 and the outer periphery of the sleeve 10. A vertical rod 23 is fixedly connected to the middle of the top end of the lower sealing plate 21. A spring 26 is movably sleeved between the sleeve 10 and the lower sealing plate 21 and outside the vertical rod 23. A vertical groove 24 matching the vertical rod 23 is opened in the middle of the bottom end of the sleeve 10. A vertical limiting post 25 is fixedly connected to the lower middle of the inner side of the valve body 1. The limiting post 25 and the vertical rod 23 are on the same central axis.

[0024] In this embodiment, by using the pressure self-compensating sealing structure, when the medium pressure increases, the O-ring 22 will generate greater radial compression deformation under pressure, so that the sealing specific pressure will automatically increase with the system pressure, ensuring that a reliable seal can be maintained under different operating conditions.

[0025] Furthermore, through the coordinated use of the mechanical interlocking mechanism, when the valve is closed, the mechanical locking of the clamp 13 and the clamp groove 14 can resist the reverse impact of the medium pressure on the sealing structure. At the same time, the main sealing structure between the upper sealing plate 7 and the valve seat 3 remains in a fixed compression state. The two work together to ensure the sealing reliability of the valve under high pressure differential.

[0026] Working principle: When the handwheel 6 is rotated, the threaded rod 4 rotates, which drives the rectangular valve stem 5 to move axially through the threaded engagement. The rectangular valve stem 5 drives the upper sealing plate 7 to move downward, causing the sealing ring 9 to press into the sealing groove 8 of the valve seat 3 to form the main seal. During this process, the upper sealing plate 7 pushes the movable block 11 downward in the sleeve 10 through the vertical rod 16. The movable block 11 drives the chuck 13 to extend radially from the movable groove 12 through the connecting rod 15 and engage with the chuck groove 14 of the valve seat 3 to form a mechanical lock. When the medium pressure acts on the lower sealing plate 21, it pushes it upward, causing the vertical rod 23 to slide along the vertical groove 24 and... The compression spring 26, and the O-ring 22 undergoes radial compression deformation under the action of medium pressure, forming a seal between the sleeve 10 and the valve seat 3. The sealing performance of the O-ring 22 increases synchronously with the increase of medium pressure. When the medium pressure reaches the upper limit of operation, the fit clearance between the limit post 25 and the vertical rod 23 ensures that the O-ring 22 will not be over-compressed. When the handwheel 6 is rotated in the reverse direction, the rectangular valve stem 5 drives the upper sealing plate 7 to rise and disengage from the valve seat 3. The spring 18 pushes the movable block 11 to move upward and retracts the locking head 13 through the connecting rod 15 to release the lock. At the same time, the spring 26 pushes the lower sealing plate 21 to reset.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-parameter power plant drain shut-off valve, characterized in that: include The valve body (1) has a valve cover (2) fixedly installed on its top end by bolts. An opening and closing mechanism is provided in the middle of the valve cover (2) and the valve body (1). A valve seat (3) is fixedly connected to the inner middle part of the valve body (1), and a flow-stopping mechanism is provided between the valve seat (3) and the opening and closing mechanism; The opening and closing mechanism includes a threaded rod (4) rotatably connected to the middle of the valve cover (2) via a bearing, and a rectangular valve rod (5) threaded to the outside of the threaded rod (4). The outer wall of the rectangular valve rod (5) is intermittently engaged with the inner wall of the valve body (1) and the middle of the valve cover (2). The top end of the threaded rod (4) extends to the outside of the valve cover (2) and is fixedly connected to a handwheel (6). The flow-stopping mechanism includes an upper sealing plate (7) fixedly connected to the bottom end of the rectangular valve stem (5), and a sealing groove (8) annularly opened on the upper end of the valve seat (3). The bottom end of the upper sealing plate (7) is fixedly connected to a sealing ring (9) that matches the sealing groove (8). The flow-stopping mechanism also includes a sleeve (10) vertically disposed at the middle of the bottom end of the upper sealing plate (7), and a movable block (11) movably disposed inside the sleeve (10). The sleeve (10) has symmetrical movable grooves (12) on both sides of the bottom end. A clamp (13) is movably installed inside the movable groove (12). A groove (14) matching the clamp (13) is provided on the inner wall of the bottom end of the valve seat (3). A connecting rod (15) is provided between the clamp (13) and the movable block (11). The two ends of the connecting rod (15) are respectively hinged to the movable block (11) and the clamp (13). The interception mechanism further includes a vertical rod (16) fixed at the middle of the top of the movable block (11) and guide grooves (17) opened on both sides of the upper end of the inner wall of the sleeve (10). The top of the vertical rod (16) is fixedly connected to the lower end face of the middle part of the upper sealing plate (7). A spring (18) is movably sleeved between the movable block (11) and the upper sealing plate (7) and outside the vertical rod (16). Guide blocks (19) that are slidably connected to the guide grooves (17) are fixedly connected on both sides of the top of the movable block (11). A corrugated sleeve (20) is fixedly connected between the guide block (19) and the upper sealing plate (7) and outside the spring (18). A lower sealing plate (21) is provided directly below the bottom end of the sleeve (10). An O-ring (22) is fixedly connected between the lower sealing plate (21) and the outer periphery of the sleeve (10). A vertical rod (23) is fixedly connected to the middle of the top end of the lower sealing plate (21). A spring (26) is movably sleeved between the sleeve (10) and the lower sealing plate (21) and outside the vertical rod (23). A vertical groove (24) matching the vertical rod (23) is opened in the middle of the bottom end of the sleeve (10). A vertical limiting post (25) is fixedly connected below the middle of the inner side of the valve body (1). The limiting post (25) and the vertical rod (23) are on the same central axis.

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