Portable valve seat mounting device for mounting large-diameter gate valve seat on site in nuclear power plant

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a portable valve seat mounting device used for mounting a large-diameter gate valve seat in a nuclear power plant field. Comprising a rack assembly and a positioning and mounting assembly, the rack assembly is fixedly connected with a valve body of the gate valve, and the positioning and mounting assembly is fixedly connected with the rack assembly. The utility model has the beneficial effects that: (1) a pure mechanical structure is stable and reliable; (2) the lightweight design is convenient for workers to carry and mount, and can adapt to complex working conditions; (3) a phase pointer and a marking line are used for positioning, so that the mounting phase of the valve seat can be ensured; the air bag is flexibly installed, the air pressure can be adjusted and controlled, the valve body is protected, and damage is reduced; and (5) the device is mounted on the valve body, the mounting can be completed only by operating the pull rod and inflating, and the operation is simple and quick.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a portable valve seat installation device for installing large-diameter gate valve seats in nuclear power plants. Background Technology

[0002] Valves are control components in fluid transport systems, possessing functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, diversion, and overflow / pressure relief. In nuclear power plants, valves not only control the flow and pressure of fluids such as air, water, steam, various corrosive media, and radioactive media within pipelines, but also isolate contaminants in the pipelines, prevent leaks, and prevent the spread of radioactive materials, ensuring the safe operation of the nuclear power plant. As a crucial component of valves, the valve seat's sealing performance directly affects the valve's safety and reliability. Nuclear power plants use a large number of welded gate valves. When the valve seat of such valves is damaged, repair is typically done by cutting the damaged valve from the pipeline and welding a new one for complete replacement. These gate valves are mostly imported products, expensive, and have long customization cycles, which is detrimental to the maintenance and operation of nuclear power plants. Therefore, online valve seat replacement is being considered for valve repair. Online valve seat replacement can save significant funds, shorten maintenance cycles, and reduce damage to the pipeline caused by cutting.

[0003] The key step in online replacement of gate valve seats is the installation of the new seat. For this type of gate valve seat, installation is typically completed at the factory using specialized tools and equipment found in the plant. However, due to the complex working conditions and limited space at nuclear power plants, conventional tools and equipment cannot complete the online installation of the new seat.

[0004] The specific problems encountered during the online installation of the new valve seat are as follows:

[0005] (1) The working conditions are complex and the special equipment in the above-mentioned factory building cannot be used.

[0006] (2) The valve seat is located far from the valve body flange mounting surface and is inaccessible by hand.

[0007] (3) It is difficult to guarantee the phase angle of the new valve seat installation. Utility Model Content

[0008] The purpose of this utility model is to provide a portable valve seat installation device for installing large-diameter gate valve seats in nuclear power plants, which can solve the technical problems of difficult installation of gate valve seats and inconvenient equipment to carry in nuclear power plants.

[0009] The technical solution of this utility model is as follows: A portable valve seat installation device for installing large-diameter gate valve seats in nuclear power plants, comprising a frame assembly and a positioning and installation assembly, wherein the frame assembly is connected and fixed to the valve body of the gate valve, and the positioning and installation assembly is connected and fixed to the frame assembly.

[0010] The frame assembly includes an integrated plate, an auxiliary support assembly, a pull rope, a positioning plate, a guide block, a second pull rod, a first pull rod, a handle, and a stiffener. The integrated plate, the positioning plate, and the stiffener are fixed in pairs. The auxiliary support assembly is fixed to the integrated plate. The guide block and the handle are fixed to the positioning plate. The first pull rod and the second pull rod are slidably connected in the guide block.

[0011] The auxiliary support assembly includes a fixed slider, a slider, a spring, a fixing block, and a guide rod. The fixed slider and the fixing block are fixed to the integrated plate. The spring is located between the slider and the fixing block. The guide rod passes through the spring and the fixing block. One end of the guide rod is connected to the slider, and the other end is connected to the pull rope.

[0012] The slider and the fixed slider are guided by a T-slot and can slide relative to each other.

[0013] The positioning and installation assembly includes an airbag, an inner guide cylinder, a second pull rope, an outer guide cylinder, guide posts, a phase pointer, a push plate, a push block, an eccentric shaft, a support column, and an adjusting push block. The inner guide cylinder, outer guide cylinder, guide post, phase pointer, eccentric shaft, and support column are fixed to the integrated plate. The airbag is located between the push plate and the integrated plate. One end of the second pull rope is connected to the push plate, and the other end is connected to the second pull rod. There are three guide posts, evenly distributed around the circumference, which pass through the three guide holes of the push plate. The push plate can slide along the guide posts. The push block and adjusting push block are fixed to the push plate.

[0014] The phase pointer centerline is aligned with the centerline of the integrated board to ensure the installation phase of the new valve seat.

[0015] The support columns are two columns located at the 10 o'clock and 2 o'clock positions respectively in the circumferential direction.

[0016] The eccentric shaft is positioned at the 6 o'clock position in the circumferential direction.

[0017] The two support columns and the eccentric shaft are on the same pitch circle.

[0018] The eccentric shaft can be adjusted in size. By adjusting the eccentric shaft, the eccentric shaft and the two support columns are brought into contact with the inner surface of the new valve seat to support the new valve seat.

[0019] The beneficial effects of this utility model are: (1) Pure mechanical structure, stable and reliable; (2) Lightweight design, convenient for workers to handle and install, and can adapt to complex working conditions; (3) Using phase pointer and marking line for positioning, the valve seat installation phase can be guaranteed; (4) Flexible installation of airbag, adjustable air pressure, protects the valve body and reduces damage; (5) The device is installed on the valve body, and installation can be completed by simply operating the pull rod and inflating the air, which is simple and quick to operate. Attached Figure Description

[0020] Figure 1 A schematic diagram of a portable valve seat installation device for installing large-diameter gate valve seats in a nuclear power plant, provided by this utility model, installed on a large-diameter gate valve.

[0021] Figure 2 This is a front view of the rack assembly in this utility model;

[0022] Figure 3 This is a top view of the frame assembly in this utility model;

[0023] Figure 4 This is a front view of the auxiliary support component in this utility model;

[0024] Figure 5 This is a full sectional view of the positioning and installation component in this utility model;

[0025] Figure 6 This is a right view of the positioning and installation component in this utility model.

[0026] In the diagram: 1. Frame assembly, 2. Positioning and mounting assembly, 3. Valve body, 4. Valve seat, 11. Integrated plate, 12. Auxiliary support assembly, 13. Pull rope, 14. Positioning plate, 15. Guide block, 16. Pull rod No. 2, 17. Pull rod No. 1, 18. Handle, 19. Pointer, 110. Rib plate, 111. Screw, 121. Fixed slider, 122. Slider, 123. Spring, 124. Fixed block, 125. Guide rod, 21. Airbag, 22. Inner guide cylinder, 23. Pull rope II, 24. Outer guide cylinder, 25. Guide column, 26. Phase pointer, 27. Push plate, 28. Push block, 29. Eccentric shaft, 210. Support column, 211. Adjustment push block. Detailed Implementation

[0027] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0028] like Figure 1As shown, a portable valve seat installation device for installing large-diameter gate valve seats in nuclear power plants includes: a frame assembly 1 and a positioning and mounting assembly 2. The frame assembly 1 and the valve body of the gate valve are fixed together by screws, and the positioning and mounting assembly 2 and the frame assembly 1 are connected by bolts.

[0029] like Figure 2 and Figure 3 As shown, the frame assembly 1 includes: an integrated plate 11, an auxiliary support assembly 12, a pull rope 13, a positioning plate 14, a guide block 15, a second pull rod 16, a first pull rod 17, a handle 18, a pointer 19, a stiffener 110, and screws 111. The integrated plate 11, positioning plate 14, and stiffener 110 are fixed in pairs with screws. The auxiliary support assembly 12 is fixed to the integrated plate 11 with screws, and the guide block 15 and handle 18 are fixed to the positioning plate 14 with screws. Both the first pull rod 17 and the second pull rod 16 can slide within the guide block 15. A position locking and release mechanism is also provided to lock and release the positions of the second pull rod 16 and the first pull rod 17.

[0030] The integrated plate 11, positioning plate 14, and stiffening plate 110 all have weight-reducing holes to lower the overall weight of the device and facilitate on-site use. Positioning plate 14 has a stop to ensure radial positioning of the new valve seat relative to the valve body. Pull rod 17, pull rod 16, and guide block 15 are equipped with position locking and release mechanisms to lock and release the positions of pull rods 17 and 16. Two handles are symmetrically arranged for easy operation. The pointer 19 coincides with the center line of the stop on positioning plate 14, ensuring concentricity between the new valve seat and the hole at the installation location.

[0031] like Figure 4 As shown, the auxiliary support assembly 12 includes: a fixed slider 121, a slider 122, a spring 123, a fixing block 124, and a guide rod 125. The fixed slider 121 and the fixing block 124 are fixed to the integrated plate 11 by screws. The slider 122 and the fixed slider 121 are guided by a T-slot and can slide relative to each other. The spring 123 is located between the slider 122 and the fixing block 124. The guide rod 125 passes through the spring 123 and the fixing block 124. One end of the guide rod 125 is connected to the slider 122, and the other end is connected to the pull rope 13. After releasing the first pull rod 17, the slider 122 slides downward under the action of the spring 123, causing the outer side of the slider 122 to be close to the inner wall of the valve body 3, which provides support when installing the valve seat. Pulling the first pull rod 17 causes the slider 122 to slide upward back to its original position. After reaching the original position, the first pull rod 17 is locked to keep the slider 122 in the returned state.

[0032] like Figure 5 and Figure 6As shown, the positioning and mounting assembly 2 includes: an airbag 21, an inner guide cylinder 22, a pull rope 23, an outer guide cylinder 24, a guide post 25, a phase pointer 26, a push plate 27, a push block 28, an eccentric shaft 29, a support column 210, and an adjusting push block 211. The inner guide cylinder 22, outer guide cylinder 24, guide post 25, phase pointer 26, and eccentric shaft 29 are fixed to the integrated plate 11 with screws. There are three guide posts 25, evenly distributed circumferentially, which pass through the three guide holes of the push plate 27, allowing the push plate 27 to slide along the guide posts 25. The airbag 21 is located between the push plate 27 and the integrated plate 11; when inflated, the airbag 21 can push the push plate 27 out. One end of the second pull rope 23 is connected to the push plate 27, and the other end is connected to the second pull rod 16. Releasing the second pull rod 16 inflates the airbag 21 and pushes the push plate 27 out. Deflating the airbag 21 pulls the second pull rod 16 back to the push plate 27. Locking the second pull rod 16 keeps the push plate 27 in the returned position. The push block 28 and the adjusting push block 211 are fixed to the push plate 27 with screws. The position of the adjusting push block 211 can be adjusted as needed.

[0033] The center line of the phase pointer 26 is aligned with the center line of the integrated plate 11 to ensure the installation phase of the new valve seat.

[0034] The support columns 210 are located at the 10 o'clock and 2 o'clock positions on the circumference, respectively. The eccentric shaft 29 is located at the 6 o'clock position on the circumference. The two support columns 210 and the eccentric shaft 29 are on the same pitch circle. The eccentricity of the eccentric shaft 29 can be adjusted. By adjusting the eccentric shaft 29, the eccentric shaft 29 and the two support columns 210 are brought into contact with the inner surface of the new valve seat, thus supporting the new valve seat.

[0035] The specific usage process of this utility model is described below:

[0036] Step 1: Make the end face of the new valve seat 4 fit with the push block 28 and the adjusting push block 211, align the marking line on the outer surface of the new valve seat 4 with the phase pointer 26 to ensure the installation phase of the new valve seat 4, and adjust the rotating eccentric shaft 29 so that the inner surface of the new valve seat 4 fits with the support column 210 and the eccentric shaft 29.

[0037] Step 2: Pre-install the valve seat mounting device along with the new valve seat 4 on the valve body 3. The positioning plate 14 is machined with a stop to ensure the radial positioning of the new valve seat 4 and the valve body 3. Rotate the valve seat mounting device to align the pointer 19 with the marking line on the flange surface of the valve body 3, ensuring the concentricity of the stop between the new valve seat 4 and the valve seat of the valve body 3. Tighten the screw 111.

[0038] Step 3: Release lever 17. Slider 122 slides downward under the action of spring 123, with the outer side of slider 122 pressed against the inner wall of valve body 3. Release lever 16. Airbag 21 inflates. Push plate 27 carries the new valve seat 4 out and installs the new valve seat 4 into place.

[0039] Step 4: Deflate airbag 21, pull lever 16, push plate 27 back to its original position, lock lever 16, pull lever 17, slide slider 122 upwards back to its original position, lock lever 17.

[0040] Step 5: After the new valve seat 4 is installed, remove the equipment.

Claims

1. A portable valve seat installation device for large-bore gate valve seat installation at a nuclear power plant site, characterized by: The utility model provides a gate valve positioning installation device, which comprises a rack assembly and a positioning installation assembly.

2. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 1, characterized in that: The rack assembly comprises an integrated plate, an auxiliary support assembly, a pull rope, a positioning plate, a guide block, a second pull rod, a first pull rod, a handle and a rib plate.

3. A portable valve seat installation device for installation of a large diameter gate valve seat in a nuclear power plant site as claimed in claim 2, characterized in that: The auxiliary support assembly comprises a fixed sliding block, a sliding block, a spring, a fixed block and a guide rod.

4. A portable valve seat installation device for installation of a large diameter gate valve seat in a nuclear power plant site as defined in claim 3, characterized in that: The sliding block and the fixed sliding block are guided by a T-shaped slot and can slide relative to each other.

5. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 2, characterized in that: The positioning installation assembly comprises an air bag, an inner guide cylinder, a second pull rope, an outer guide cylinder, a guide column, a phase pointer, a push disc, a push block, an eccentric shaft, a support column and an adjusting push block.

6. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant field according to claim 5, characterized in that: The inner guide cylinder, the outer guide cylinder, the guide column, the phase pointer, the eccentric shaft and the support column are fixed to the integrated plate.

7. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 5, characterized in that: The air bag is located between the push disc and the integrated plate.

8. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 5, characterized in that: The second pull rope is connected to the push disc at one end and to the second pull rod at the other end.

9. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 5, characterized in that: The guide column has three parts and is arranged in a circumferential direction.

10. A portable valve seat installation device for large diameter gate valve seat installation in a nuclear power plant site as claimed in claim 5, characterized in that: The push disc can slide along the guide column. The push block and the adjusting push block are fixed to the push disc. The phase pointer is installed along the center line of the integrated plate to ensure the installation phase of the new valve seat. The support column has two parts and is arranged at the 10 o'clock and 2 o'clock positions in the circumferential direction. The eccentric shaft is arranged at the 6 o'clock position in the circumferential direction. The two support columns and the eccentric shaft are on the same circle. The eccentric shaft can adjust the eccentricity. By adjusting the eccentric shaft, the eccentric shaft and the two support columns are fitted to the inner surface of the new valve seat to support the new valve seat.

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