Polishing and cleaning device for nuclear island gate valve leakage guiding ring containing cavity

Abstract

The invention belongs to the technical field of valve maintenance, and particularly relates to a nuclear island gate valve leakage guide ring containing cavity polishing and cleaning device. The cleaning device is composed of a split type shaft sleeve, a spring piece, a cleaning piece and a synchronous belt, the cleaning piece is fixed to the spring piece, the spring piece is fixed to a valve rod along with the split type shaft sleeve, and the synchronous belt is arranged at the top end of the split type shaft sleeve. During working, the synchronous belt is manually and repeatedly pushed and pulled to clean and polish the inner wall of the stuffing box cavity, the cleaning piece can be completely attached to the inner wall of the stuffing box through the elastic effect of the spring piece, and the inner wall of the stuffing box cavity can be cleaned by repeatedly driving the split shaft sleeve. The inner wall of the stuffing box is smooth and clean, so that upward movement of the leakage guiding ring is facilitated, the device is also suitable for polishing and cleaning of stuffing box cavities of other types of valves, and stuffing sealing is facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of valve maintenance, and in particular relates to a device for polishing and cleaning a leakage guide ring accommodating cavity of a nuclear island gate valve. Background Art

[0002] Nuclear island gate valves are used for primary system status control in power plants. After long-term operation, the system medium will become radioactive. A packing leakage ring is usually designed at the gate valve stem seal to collect the leaked medium at the stem packing and drain it into a sealed container or system, thereby avoiding the leakage of the medium caused by the failure of the stem packing seal and polluting the environment.

[0003] During gate valve maintenance, the packing leak ring must be removed and the packing above and below replaced. Due to corrosion during operation and foreign matter from packing wear becoming lodged between the leak ring and the inner wall of the stuffing box, the original method of removing the leak ring using specialized tools becomes ineffective, making it impossible to replace the packing below it. This results in long-term defective system operation, and the packing below the leak ring becomes damaged and deteriorates, leading to a loss of control over the primary circuit of the unit.

[0004] At present, the solution for the situation that the leakage ring is stuck and cannot be removed at home and abroad is to use the electric spark machining process to cut the packing leakage ring online, and design a special tool to remove the cut packing leakage ring. This method not only takes a long time to cut, but also occupies a large space for the electric spark cooling system. At the same time, it also requires at least 5 operators to cooperate with the maintenance work, which is costly and inefficient.

[0005] To improve the efficiency of extracting the leak ring, avoid complete damage, and allow for reuse, a method is proposed in which the upper end surface of the leak ring is drilled and tapped. A screw is then inserted to pull the leak ring upward from the stuffing box. However, dirt on the inner wall of the stuffing box can cause the leak ring to become stuck. Therefore, before extracting the leak ring, the inner wall of the stuffing box must be polished and cleaned to ensure a smooth and clean surface, facilitating its upward movement. However, currently, no suitable polishing and cleaning tools are available for stuffing boxes. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for polishing and cleaning the accommodating cavity of a leakage guide ring of a nuclear island gate valve, so as to make the inner wall of the stuffing box smooth and clean, thereby facilitating the upward movement of the leakage guide ring.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A device for polishing and cleaning the leakage ring accommodating cavity of a nuclear island gate valve consists of a split shaft sleeve, a spring sheet, a cleaning piece and a synchronous belt. The cleaning piece is fixed on the spring sheet, and the spring sheet is fixed on the valve stem together with the split shaft sleeve. The synchronous belt is placed on the top of the split shaft sleeve.

[0008] During operation, the synchronous belt is manually pushed and pulled repeatedly to clean and polish the inner wall of the stuffing box cavity. The elastic action of the spring plate allows the cleaning piece to completely adhere to the inner wall of the stuffing box. The cleaning piece can be a cut scouring pad or a silicone sheet with sandpaper of different grits, which is selected according to the condition of the inner wall of the stuffing box cavity on site. The inner wall of the stuffing box cavity is cleaned by repeatedly driving the split sleeve.

[0009] The lower end of each half of the split shaft sleeve is provided with an arc-shaped body, and magnets are provided at both ends of the arc-shaped body.

[0010] The magnet has outwardly facing wedge-shaped ends.

[0011] When the split shaft sleeve is sleeved on the valve stem, the two arc-shaped bodies are detachably connected by bolts, so that the wedge-shaped ends of the two arc-shaped bodies form a trapezoidal notch relative to each other.

[0012] The slot is larger on the outside and smaller on the inside, so that the iron filings produced by grinding are attracted into the slot by the magnetic field.

[0013] A roller with a brush is arranged in the slot.

[0014] The roller is detachably connected to the arc-shaped bodies on both sides through a bracket, and the shaft of the roller is rotatably connected to the bracket, so that the roller can rotate freely.

[0015] During grinding, the roller surface is in frictional contact with the inner wall of the stuffing box, so that the roller can rotate during grinding. While removing dirt from the inner wall of the stuffing box, it is helpful to bring iron chips into the groove to be adsorbed by the magnetic field.

[0016] The beneficial effects achieved by the present invention are: The present invention consists of a split sleeve, a spring sheet, a cleaning element, and a synchronous belt. The split sleeve is fixed to the valve stem, and the cleaning element is fixed to the spring sheet. The synchronous belt is manually pushed and pulled repeatedly to clean and polish the inner wall of the stuffing box. The elastic action of the spring sheet allows the cleaning element to completely fit the inner wall of the valve stuffing box. The cleaning element can be a cut scouring pad or a silicone sheet with sandpaper of different mesh sizes, and is selected according to the inner wall conditions of the stuffing box chamber on site. By repeatedly rotating the split sleeve, the inner wall of the stuffing chamber can be fully cleaned, effectively improving cleaning efficiency and facilitating the upward movement of the leak ring. After the device is dismantled, the residue is cleaned with a vacuum cleaner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation of a device for polishing and cleaning the leakage ring cavity of a nuclear island gate valve; Figure 2 Schematic diagram of a device for polishing and cleaning the leakage ring cavity of a nuclear island gate valve (I); Figure 3Schematic diagram II of a device for polishing and cleaning the leakage ring cavity of a nuclear island gate valve; Figure 4 for Figure 3 AA cross-section diagram; In the figure: 1. Valve yoke; 2. Leakage ring; 3. Lower packing; 4. Valve stem; 5. Stuffing box; 11. Grinding and cleaning device; 1101. Synchronous belt; 1102. Split sleeve; 1103. Spring leaf; 1104. Cleaning element; 61. Arc-shaped body; 62. Magnet; 63. Bolt; 64. Notch; 65. Roller; 66. Bracket. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-4 As shown, a nuclear island gate valve leakage ring accommodating cavity grinding and cleaning device 11 is used to clean the inner wall of the stuffing box 5 cavity. It consists of a split sleeve 1102, a spring sheet 1103, a cleaning piece 1104 and a synchronous belt 1101. During assembly, the cleaning piece 1104 is first fixed on the spring sheet 1103, and the spring sheet 1103 is fixed on the valve stem 4 together with the split sleeve 1102. Finally, the synchronous belt 1101 is placed on the top of the split sleeve 1102; during operation, the synchronous belt 1101 is manually pushed and pulled repeatedly to clean and grind the inner wall of the stuffing box 5 cavity. Through the elastic action of the spring sheet 1103, the cleaning piece 1104 can completely fit the inner wall of the stuffing box 5. The cleaning piece 1104 can be a cut scouring pad or a silicone skin with sandpaper of different meshes. It is selected according to the situation of the inner wall of the stuffing box 5 cavity on site. By repeatedly driving the split sleeve 1102, the inner wall of the stuffing box 5 can be fully cleaned, effectively improving the cleaning efficiency. After removal, the residue can be cleaned with a vacuum cleaner.

[0020] An arc-shaped body 61 is provided at the lower end of each half of the split sleeve 1102, and magnets 62 are provided at both ends of the arc-shaped body 61. The magnets 62 have outward-facing wedge-shaped ends. When the split sleeve 1102 is sleeved on the valve stem 4, the two arc-shaped bodies 61 are detachably connected by bolts 63, so that the wedge-shaped ends of the two arc-shaped bodies 61 relatively form a trapezoidal notch 64. The notch 64 is larger on the outside and smaller on the inside, so that the iron chips produced during grinding can be attracted into the notch 64 by the magnetic field, which is beneficial to the collection of the iron chips produced during grinding and prevents the iron chips from flying around and affecting the grinding effect.

[0021] Furthermore, a roller 65 with a brush can be provided in the slot 64. The roller 65 is detachably connected to the arc-shaped body 61 on both sides through a bracket 66. The roller 65 shaft is rotatably connected to the bracket 66 so that the roller 65 can rotate freely. During grinding, the surface of the roller 65 is in frictional contact with the inner wall of the stuffing box 5, so that it can rotate during grinding. While removing dirt from the inner wall of the stuffing box 5, it is also beneficial to bring iron filings into the slot 64 to be adsorbed by the magnetic field.

Claims

1. A device for polishing and cleaning the leakage ring accommodating cavity of a nuclear island gate valve, characterized by: It consists of a split sleeve, a spring sheet, a cleaning piece and a synchronous belt. The cleaning piece is fixed on the spring sheet, and the spring sheet is fixed on the valve stem together with the split sleeve. The synchronous belt is placed on the top of the split sleeve. An arc-shaped body is provided at the lower end of each half of the split sleeve, and magnets are provided at both ends of the arc-shaped body.

2. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 1 is characterized in that: The magnet has outwardly facing wedge-shaped ends.

3. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 2 is characterized in that: When the split shaft sleeve is sleeved on the valve stem, the two arc-shaped bodies are detachably connected by bolts, so that the wedge-shaped ends of the two arc-shaped bodies form a trapezoidal notch relative to each other.

4. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 3 is characterized in that: The slot is larger on the outside and smaller on the inside, so that the iron filings produced by grinding are attracted into the slot by the magnetic field.

5. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 3 is characterized in that: A roller with a brush is arranged in the slot.

6. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 5 is characterized in that: The roller is detachably connected to the arc-shaped bodies on both sides through a bracket, and the shaft of the roller is rotatably connected to the bracket, so that the roller can rotate freely.

7. The device for polishing and cleaning the leakage guide ring cavity of a nuclear island gate valve according to claim 6 is characterized in that: During grinding, the roller surface is in frictional contact with the inner wall of the stuffing box.

8. A method for polishing and cleaning the leakage ring accommodating cavity of a nuclear island gate valve, characterized in that: During operation, the synchronous belt is manually pushed and pulled repeatedly to clean and polish the inner wall of the stuffing box chamber.

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