Valve clack dismounting device for water pressure test of supercritical spring type safety valve

Abstract

The utility model relates to a valve clack dismounting device for a supercritical spring type safety valve in a hydrostatic test, belonging to a special tool. The device is used when a supercritical safety valve is used for disassembling a hydraulic test valve clack and is characterized in that a support (1) is directly installed on a safety valve spring cover, one end of a connecting rod (3) is provided with trapezoidal threads, the other end of the connecting rod (3) is provided with internal threads, the trapezoidal threads are connected with a valve rod nut (4), the internal threads are connected with a safety valve rod, and the upper portion and the lower portion of the valve rod nut (4) are each provided with a bearing (3). And the bearing gland (5) is used for pressing. The valve rod nut is driven by the rotating hand wheel (6) to rotate together, and the connecting rod (3) and the valve rod of the safety valve move upwards together through trapezoidal thread transmission. The counter-acting force which acts on the connecting bolt and is generated by the spring force is overcome, at the moment, the connecting bolt can be easily disassembled, and then the hydraulic test valve clack is disassembled. According to the utility model, the problem that the valve clack is difficult to disassemble in the hydrostatic test of the supercritical spring type safety valve is effectively solved, the labor time is saved, the labor efficiency is improved, and the design scheme is more humanized.

Description

Technical Field

[0001] The utility model discloses a supercritical spring type safety valve water pressure test valve flap disassembly device, which is used for quickly disassembling the water pressure test valve flap after the water pressure of the boiler system is qualified. Background Art

[0002] At present, the safety valves used in supercritical thermal power units are all spring-type safety valves, which adjust the exact starting pressure by adjusting the spring force generated after the compression spring. The supercritical spring-type safety valve is equipped with a water pressure test disc inside the valve. After the water pressure test of the boiler system is completed, it needs to be removed by professionals before it can be used normally. After the overall assembly of the valve is completed, the spring is in a compressed state, and the reaction force generated by the spring force all acts on the connecting bolts. For spring-type safety valves with low starting pressure, the reaction force is small, the load on the connecting bolts is small, and disassembly is relatively easy. However, the starting pressure of the supercritical spring-type safety valve is very high, the spring force provided by the spring is large, and the load acting on the connecting bolts is large. Disassembly is very difficult or even impossible, which seriously affects the subsequent start-up work of the power plant. Summary of the invention

[0003] In order to solve the problem of difficulty in disassembling a supercritical spring type safety valve hydraulic test valve disc, the utility model provides a supercritical spring type safety valve hydraulic test valve disc disassembly device, which can easily and quickly disassemble the connecting bolts and then disassemble the hydraulic test valve disc.

[0004] The technical solution adopted by the utility model is as follows: the bracket (1), connecting rod (2), bearing (3), valve stem nut (4), bearing cover (5), hand wheel (6) and other components are composed, and the characteristics are: the bracket (1) is directly installed on the safety valve spring cover, the connecting rod (3) has a trapezoidal thread at one end and an internal thread at the other end, the trapezoidal thread is connected to the valve stem nut (4), the internal thread is connected to the safety valve stem (VI), and the valve stem nut (4) is respectively equipped with a bearing (3) at the top and the bottom, which is tightened by the bearing cover (5). By rotating the hand wheel (6), the valve stem nut is driven to rotate together, and the connecting rod (3) and the safety valve stem (VI) are moved upward together through the trapezoidal thread transmission. The reaction force generated by the spring force acting on the connecting bolt (IV) is overcome, and the connecting bolt can be easily disassembled at this time, and then the water pressure test valve disc can be disassembled.

[0005] The beneficial effects of the utility model are: effectively solving the problem of difficult disassembly of the supercritical spring type safety valve water pressure test valve disc, saving labor time, improving labor efficiency, and making the design scheme more humane. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The utility model is further described below in conjunction with the accompanying drawings.

[0007] Figure 1This is the installation diagram of the supercritical spring type safety valve hydraulic test valve disc removal device

[0008] In the figure: Ⅰ, water pressure test valve disc, Ⅱ, valve disc assembly, Ⅲ, sleeve assembly, Ⅳ, connecting bolts, Ⅴ, spring assembly, Ⅵ, valve stem, Ⅶ, disassembly device.

[0009] Figure 2 This is the assembly drawing of the valve disc disassembly device for the supercritical spring-type safety valve hydraulic test

[0010] In the figure: 1. bracket, 2. connecting rod, 3. bearing, 4. valve stem nut, 5. bearing cover, 6. hand wheel, 7. locking nut.

[0011] Figure 3 Schematic diagram of spring assembly

[0012] Figure 4 Schematic diagram of the sleeve assembly

[0013] Figure 5 Schematic diagram of the valve disc assembly DETAILED DESCRIPTION

[0014] Figure 1 As shown in the figure, the disassembly device is installed on the spring cover by bolts, and the connecting rod is connected to the valve stem by threads. The valve stem nut is driven to rotate by rotating the hand wheel, and the valve stem nut is connected to the connecting rod by threads to complete the lifting movement of the connecting rod.

[0015] When removing the water pressure test valve disc, rotate the handwheel to move the connecting rod upward, and the connecting rod drives the valve stem to move upward. At this time, the spring is in a stable compression state, and the spring force is fully applied to the thread between the valve stem nut and the connecting rod. The connecting bolt no longer bears the reaction force generated by the spring force, and the connecting bolt can be easily removed. The spring assembly, sleeve assembly, and valve disc assembly can be removed in turn, and then the water pressure test valve disc can be removed.

[0016] After the valve disc is removed during the water pressure test, the safety valve is reassembled, and the hand wheel is rotated to move the connecting rod and the valve stem downward. After the valve stem head contacts the valve disc, the reaction force generated by the spring force acts on the connecting bolt again. At this time, the connecting rod and the valve stem nut thread no longer bear the spring force, and the disassembly device can be easily removed, and the safety valve can be used normally.

Claims

1. A supercritical spring-type safety valve hydraulic test valve flap disassembly device, comprising a bracket (1), a connecting rod (2), a bearing (3), a valve stem nut (4), a bearing gland (5), and a hand wheel (6); characterized in that: The bracket (1) is directly mounted on the safety valve spring cover, one end of the connecting rod (2) is a trapezoidal thread and the other end is an internal thread, the trapezoidal thread is connected to the valve stem nut (4), the internal thread is connected to the safety valve stem (VI), the valve stem nut (4) is provided with a bearing (3) at the top and bottom, and is compressed by a bearing pressure cover (5); the valve stem nut is driven to rotate together by rotating the hand wheel (6), and the connecting rod (2) and the safety valve stem (VI) are moved upward together by the trapezoidal thread transmission; the reaction force generated by the spring force acting on the connecting bolt (IV) is overcome, and the connecting bolt can be easily disassembled at this time, and then the water pressure test valve disc can be disassembled.

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