Self-relieving nuclear power cut-off valve

Abstract

This application relates to a self-relieving pressure shut-off valve for nuclear power plants, comprising a valve body, a valve cover mounted on the valve body, a valve stem threadedly connected to the valve cover, the valve stem being slidably mounted on the valve body, one end of the valve stem inserted into the valve body, a flow channel formed within the valve body, a partition plate fixedly mounted within the valve body, the partition plate separating the flow channel, and a through hole formed on the partition plate, a valve plate mounted on the end of the valve stem inserted into the valve body, the valve stem sliding to drive the valve plate to close or open the through hole, a pressure relief mechanism mounted on the valve body, the pressure relief mechanism comprising a pressure relief pipe, a pressure relief port, a pressure relief baffle, and a spring element, the pressure relief pipe being mounted on the valve body and communicating with the flow channel, the pressure relief port being located on the side wall of the pressure relief pipe, the pressure relief baffle being slidably mounted within the pressure relief pipe, the pressure relief baffle being opened by sliding to close the pressure relief port, and the spring element being mounted between the pressure relief pipe and the pressure relief baffle, the spring element driving the pressure relief baffle to close the pressure relief port. This valve effectively reduces the pressure within the pipeline system.

Description

Technical Field

[0001] This application relates to the field of nuclear power equipment, and in particular to a self-relieving nuclear power shut-off valve. Background Technology

[0002] Nuclear power plant shut-off valves are valves used in the piping systems of nuclear power plants. Their main function is to cut off or allow the flow of fluid media in the pipelines, such as coolant (usually water) or steam. When maintenance, repair, or changes in fluid flow are required, the shut-off valve can be closed to prevent the flow of the medium, thereby achieving effective control of the fluid within the pipeline.

[0003] Nuclear power plant shut-off valves are subject to high pressure during use. When the pressure of the fluid medium inside the shut-off valve is too high, it can easily damage the valve, increasing the probability of leakage when the valve is shut off. The high pressure in the entire pipeline system can also easily lead to damage to the pipeline system. Summary of the Invention

[0004] In order to reduce the pressure in the pipeline system, this application provides a self-relieving nuclear power plant shut-off valve.

[0005] The self-relieving pressure-reducing nuclear power plant shut-off valve provided in this application adopts the following technical solution:

[0006] A self-releasing pressure shut-off valve for nuclear power plants includes a valve body with a valve cover. A valve stem is threaded onto the valve cover and slidably mounted on the valve body. One end of the valve stem is inserted into the valve body, which has a flow channel. A partition plate is fixedly mounted inside the valve body, separating the flow channel. A through hole is provided on the partition plate. A valve plate is mounted on the end of the valve stem inserted into the valve body. The sliding movement of the valve stem drives the valve plate to close or open the through hole. A pressure relief mechanism is mounted on the valve body, comprising a pressure relief pipe, a pressure relief port, a pressure relief baffle, and a spring element. The pressure relief pipe is mounted on the valve body and communicates with the flow channel. The pressure relief port is located on the side wall of the pressure relief pipe. The pressure relief baffle is slidably mounted inside the pressure relief pipe. The pressure relief baffle opens by sliding and then closes the pressure relief port. The spring element is installed between the pressure relief pipe and the pressure relief baffle, and drives the pressure relief baffle to close the pressure relief port.

[0007] By adopting the above technical solution, when the pressure inside the valve body is too high, the pressure will drive the pressure relief block to slide and open the pressure relief port to relieve pressure in the flow channel, thereby reducing the pressure in the pipeline system. By relieving pressure in the flow channel, the probability of the shut-off valve being damaged due to excessive pressure in the flow channel is reduced, and the probability of the pipeline system being damaged due to excessive pressure is also reduced.

[0008] Optionally, a limiting ring is fixed inside the pressure relief pipe, and the pressure relief port is closed when the pressure relief block abuts against the limiting ring.

[0009] Optionally, an adjustment assembly is provided inside the pressure relief pipe. The adjustment assembly includes an adjustment block and an adjustment screw. The adjustment block is slidably disposed inside the pressure relief pipe. The end of the elastic element away from the pressure relief block abuts against the adjustment block. The adjustment screw is threadedly connected to the pressure relief pipe and abuts against the adjustment block.

[0010] Optionally, the elastic element includes a rubber shell and a built-in spring, with one end of the rubber shell abutting against the adjusting block and the other end abutting against the pressure relief block, and the built-in spring embedded in the rubber shell.

[0011] Optionally, the pressure relief pipe is connected to and communicates with a return pipe at the pressure relief port. The return pipe has an exhaust port, and the end of the return pipe away from the pressure relief pipe is connected to the valve body and communicates with the flow channel.

[0012] Optionally, a one-way valve is installed on the return pipe, which restricts the flow of material in the flow channel to the return pipe.

[0013] Optionally, a brush is provided inside the reflux pipe.

[0014] Optionally, a retaining ring is installed at the exhaust port, and the brush is fixed on the retaining ring.

[0015] Optionally, the retaining ring is rotatably positioned at the exhaust port.

[0016] Optionally, the fixed ring is hinged with several baffles, which open or close the fixed ring by rotation.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. When the pressure inside the valve body is too high, the pressure will drive the pressure relief block to slide and open the pressure relief port to relieve pressure in the flow channel, thereby reducing the pressure in the pipeline system. By relieving pressure in the flow channel, the probability of the shut-off valve being damaged due to excessive pressure in the flow channel is reduced, and the probability of the pipeline system being damaged due to excessive pressure is also reduced.

[0019] 2. By rotating the adjusting screw, the adjusting screw is driven to slide, thereby causing the adjusting block to slide. The squeezing of the elastic element by the adjusting block and the limiting ring increases the force required to drive the elastic element, thereby adjusting the force required to drive the pressure relief block to slide and open the pressure relief port. The pressure relief mechanism can be adjusted according to the pressure relief limit required, which improves the applicability of the pressure relief mechanism and reduces the probability of insufficient pressure in the liquid flow caused by pressure relief when the pressure is not high.

[0020] 3. The dual elastic force of the rubber shell and the built-in spring can increase the upper limit of the elastic force of the elastic component. When the rubber shell and the built-in spring are damaged, causing the elastic force to decrease or disappear, the rubber shell can be deformed by adjusting the component to block the pressure relief port. This allows the valve body to continue to be used as a normal shut-off valve when the pressure relief mechanism is damaged, thus extending the service life of the valve body.

[0021] 4. The return pipe can send water leaking from the pressure relief port back into the flow channel, thereby reducing the probability of water leaking out of the flow channel. The one-way valve can reduce the probability of liquid in the flow channel entering the return pipe.

[0022] 5. The brush design reduces the liquid content in the return pipe and also adheres to impurities, thus reducing the impurity content in the flow channel. The brush is detachably installed at the vent via a retaining ring, facilitating replacement when damaged and disassembly and cleaning after prolonged use. The rotating retaining ring at the vent allows the brush to rotate when there is a large water flow in the return pipe, thereby mitigating the impact of the water flow on the brush and reducing the probability of brush damage. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0024] Figure 2 This is a cross-sectional view of the overall structure of an embodiment of this application.

[0025] Figure 3 yes Figure 2 A magnified view of section A in the middle.

[0026] Figure 4 yes Figure 1 A magnified view of section B in the middle.

[0027] In the diagram, 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Flow channel; 5. Divider plate; 6. Through hole; 7. Valve plate; 8. Pressure relief mechanism; 81. Pressure relief pipe; 82. Pressure relief port; 83. Pressure relief stop block; 84. Elastic component; 841. Rubber shell; 842. Built-in spring; 9. Limiting ring; 10. Adjusting assembly; 101. Adjusting block; 102. Adjusting screw; 11. Return pipe; 12. Exhaust port; 13. Exhaust pipe; 14. One-way valve; 15. Brush; 16. Fixing ring; 17. Reinforcing rib; 18. Baffle; 19. Sealing rubber; 20. Annular groove; 21. Insertion groove; 22. Insertion block; 23. Anti-detachment plate; 24. Handle. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 The present application will be further described with reference to specific embodiments:

[0029] First, it should be noted that in the description of this application, the use of directional terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for descriptive purposes and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of numerical quantifiers such as "first," "second," and "third" is for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, interference fits, transition fits, or integral connections; they can refer to direct connections or indirect connections through an intermediate medium. Therefore, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] This application discloses a self-releasing pressure-relief nuclear power plant shut-off valve, referring to... Figure 1 , Figure 2 and Figure 3The system includes a valve body 1, with flanges integrally formed and fixed at both ends along its length. The valve body 1 is installed in the piping system of the nuclear power facility via the flanges. A valve cover 2 is installed on top of the valve body 1, and the valve cover 2 is sealed to the valve body 1 via the flanges and bolts. A valve stem 3 is threaded onto the valve cover 2. The valve stem 3 is slidably mounted on the valve body 1 by rotation. One end of the valve stem 3 is inserted into the valve body 1, and the other end is fitted with a handle 24. A flow channel 4 is formed inside the valve body 1, and a partition plate 5 is fixed inside the valve body 1, separating the flow channel 4. The partition plate 5 has a through hole 6. A valve plate 7 is installed at the end of the valve stem 3 inserted into the valve body 1. The sliding of the valve stem 3 drives the valve plate 7 to close or open the through hole 6. Rotating the handle 24 drives the valve stem 3 to rotate on the valve cover 2. After rotating, the valve stem 3 slides on the valve cover 2, driving the valve plate 7 to slide. When the valve plate 7 closes the through hole 6, the piping system is shut off. When the valve plate 7 closes the through hole 6, the piping system is shut off. When the through hole 6 is opened, the pipeline system can transport normally. A pressure relief mechanism 8 is installed on the valve body 1. The pressure relief mechanism 8 includes a pressure relief pipe 81, a pressure relief port 82, a pressure relief block 83, and a spring element 84. The pressure relief pipe 81 is installed on the valve body 1 and connects to the flow channel 4. The pressure relief port 82 is opened on the side wall of the pressure relief pipe 81. The pressure relief block 83 is slidably installed in the pressure relief pipe 81. The pressure relief baffle 18 closes the pressure relief port 82 after sliding open. The spring element 84 is installed between the pressure relief pipe 81 and the pressure relief block 83. The spring element 84 drives the pressure relief block 83 to close the pressure relief port 82. When the pressure inside the valve body 1 is too high, the pressure will drive the pressure relief block 83 to slide open the pressure relief port 82 to relieve pressure in the flow channel 4, thereby reducing the pressure in the pipeline system. By relieving pressure in the flow channel 4, the probability of the shut-off valve being damaged due to excessive pressure in the flow channel 4 is reduced, and the probability of the pipeline system being damaged due to excessive pressure is also reduced.

[0031] Reference Figure 2 and Figure 3A limiting ring 9 is fixed inside the pressure relief pipe 81. When the pressure relief block 83 abuts against the limiting ring 9, the pressure relief port 82 is closed. The limiting ring 9 restricts the sliding of the pressure relief block 83, thereby reducing the probability that the pressure relief block 83 will slide into the flow channel 4 under the action of the elastic member 84, thus reducing the probability that the pressure relief block 83 will affect the normal flow of liquid in the flow channel 4. An adjusting component 10 is provided inside the pressure relief pipe 81. The adjusting component 10 includes an adjusting block 101 and an adjusting screw 102. The adjusting block 101 is slidably disposed inside the pressure relief pipe 81, and the end of the elastic member 84 away from the pressure relief block 83 abuts against the adjusting block 101. 1. The adjusting screw 102 is threadedly connected to the pressure relief pipe 81. The adjusting screw 102 abuts against the adjusting block 101. By rotating the adjusting screw 102, the adjusting screw 102 is driven to slide, thereby driving the adjusting block 101 to slide. The squeezing of the elastic member 84 by the adjusting block 101 and the limiting ring 9 increases the force required to drive the elastic member 84, thereby adjusting the force required to drive the pressure relief block 83 to slide and open the pressure relief port 82. The pressure relief mechanism 8 can be adjusted according to the pressure relief limit required, thereby increasing the applicability of the pressure relief mechanism 8 and reducing the probability of insufficient pressure in the liquid flow caused by pressure relief when the pressure is not high.

[0032] Reference Figure 2 and Figure 3 The elastic element 84 includes a rubber shell 841 and a built-in spring 842. One end of the rubber shell 841 abuts against the adjusting block 101 and the other end abuts against the pressure relief block 83. The built-in spring 842 is embedded in the rubber shell 841. In this embodiment, the rubber shell 841 is made of elastic rubber. The double elastic force of the rubber shell 841 and the built-in spring 842 can increase the upper limit of the elastic force of the elastic element 84. When the rubber shell 841 and the built-in spring 842 are damaged, causing the elastic force to decrease or disappear, the adjusting component 10 drives the rubber shell 841 to deform and block the pressure relief port 82. This allows the valve body 1 to continue to be used as a normal shut-off valve when the pressure relief mechanism 8 is damaged, thus extending the service life of the valve body 1.

[0033] Reference Figure 1 , Figure 2 and Figure 4 The pressure relief pipe 81 is connected to the pressure relief port 82 and is connected to the return pipe 11. The return pipe 11 has an exhaust port 12. The end of the return pipe 11 away from the pressure relief pipe 81 is connected to the valve body 1 and is connected to the flow channel 4. The return pipe 11 and the pressure relief pipe 81 are both connected to the same side of the partition plate 5, thereby reducing the probability of liquid flowing through the stop valve through the return pipe 11. The return pipe 11 can send water leaking from the pressure relief port 82 back into the flow channel 4, thereby reducing the probability of water leaking out of the flow channel 4. A one-way valve 14 is installed on the return pipe 11. The one-way valve 14 restricts the flow of substances in the flow channel 4 to the return pipe 11. The setting of the one-way valve 14 can reduce the probability of liquid in the flow channel 4 entering the return pipe 11.

[0034] Reference Figure 1 , Figure 2 and Figure 4 A brush 15 is installed inside the return pipe 11, and a retaining ring 16 is detachably installed at the exhaust port 12. The brush 15 is fixed on the retaining ring 16. In this embodiment, the bristles of the brush 15 are made of metal, preferably steel wire. The brush 15 can reduce the liquid content in the return pipe 11 and also adhere to impurities, reducing the impurity content in the flow channel 4. The brush 15 is detachably installed at the exhaust port 12 via the retaining ring 16, which facilitates replacement of the brush 15 when damaged and long-term maintenance. Disassembly and cleaning after use; the fixing ring 16 is rotatably mounted on the exhaust port 12. When the water flow in the return pipe 11 is large, the fixing ring 16 can drive the brush 15 to rotate, thereby mitigating the impact of the water flow on the brush 15 and reducing the probability of damage to the brush 15; several baffles 18 are hinged on the fixing ring 16, which open or close the fixing ring 16 by rotation. In this embodiment, the fixing ring 16 is fixed with reinforcing ribs 17, and the brush 15 is supported by these reinforcing ribs. 17 is fixed at the center of the fixed ring 16, and the baffle 18 is rotatably set between the reinforcing ribs 17. The baffle 18 cooperates with the reinforcing ribs 17 to close the fixed ring 16, thereby closing the exhaust port 12. The high-pressure gas discharged impacts the baffle 18 to open the exhaust port 12, allowing the high-pressure gas to be discharged from the exhaust port 12. After the gas is discharged, the baffle 18 is reset by the torsion spring at the hinge to close the exhaust port 12, thereby reducing the probability of debris entering the return pipe 11 from the exhaust port 12. At the same time, the brush 15 can also stick to small particles of debris entering the exhaust port 12, reducing the probability of debris flowing into the flow channel 4 through the return pipe 11. The exhaust port 12 can be used to install a fixed pipe to replenish the liquid by removing the fixed ring 16, and can also be used to replenish the flow channel 4 with liquid of different temperatures, thereby adjusting the temperature of the liquid in the flow channel 4. A sealing rubber 19 is circumferentially fitted around the baffle 18. The sealing rubber 19 can reduce the probability of the baffle 18 getting stuck by deformation, and can also seal the gap between the baffle 18 and the reinforcing ribs 17.

[0035] Reference Figure 1 , Figure 2 and Figure 4An exhaust pipe 13 is vertically connected to the exhaust port 12. An annular groove 20 is formed on the outer wall of the opening of the exhaust pipe 13. An insertion groove 21 is formed on the exhaust pipe 13, and the insertion groove 21 communicates with the annular groove 20. An insertion block 22 is fixed on the fixing ring 16. The insertion block 22 enters the annular groove 20 from the insertion groove 21 and rotates in the annular groove 20, thereby realizing the rotation of the fixing ring 16 at the exhaust port 12. An anti-detachment plate 23 is rotatably set on the exhaust pipe 13 at the insertion groove 21. Under normal conditions, the anti-detachment plate 23 is horizontally placed in the insertion groove 21 by a torsion spring to block the insertion groove 21. It can be driven by pressing. The rotating anti-detachment plate 23 opens the insertion slot 21, allowing the insertion block 22 to enter the annular groove 20. After the insertion block 22 enters the annular groove 20, the anti-detachment plate 23 is reset and sealed by the torsion spring, thus preventing the insertion block 22 from detaching from the insertion slot 21. When it is necessary to remove the fixing ring 16, press the anti-detachment plate 23 to rotate, and then rotate the fixing ring 16 to make the insertion block 22 detach from the insertion slot 21 and the annular groove 20, thus removing the fixing ring 16. The insertion slot 21 and the annular groove 20 can also be used to connect and fix other pipes when the exhaust port 12 is connected to other pipes.

[0036] The implementation principle of this application embodiment is as follows: the valve body 1 is installed on the pipeline system of the nuclear power equipment. Then, a dangerous pressure is set according to the maximum pressure that the pipeline system connected to the valve body 1 can withstand. The elastic force of the elastic element 84 is adjusted by the adjusting component 10 so that when the water pressure reaches the dangerous pressure, the pressure relief block 83 is driven to compress the elastic element 84 to open the pressure relief port 82. When the water pressure in the flow channel 4 reaches the dangerous pressure, the pressure relief port 82 opens and part of the water flow carries the gas in the water flow into the return pipe 11. The gas in the return pipe 11 is discharged through the exhaust port 12 to realize the pressure relief in the valve body 1. The liquid in the return pipe 11 flows back to the flow channel 4 to continue transportation.

[0037] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A self-unloading nuclear power plant shut-off valve, comprising a valve body (1), a valve cover (2) mounted on the valve body (1), a valve stem (3) threadedly connected to the valve cover (2), the valve stem (3) being slidably disposed on the valve body (1), one end of the valve stem (3) being inserted into the valve body (1), a flow channel (4) being provided inside the valve body (1), a partition plate (5) being fixedly disposed inside the valve body (1), the partition plate (5) separating the flow channel (4), a through hole (6) being provided on the partition plate (5), a valve plate (7) being provided at one end of the valve stem (3) inserted into the valve body (1), the valve stem (3) sliding to drive the valve plate (7) to close or open the through hole (6), characterized in that: A pressure relief mechanism (8) is installed on the valve body (1). The pressure relief mechanism (8) includes a pressure relief pipe (81), a pressure relief port (82), a pressure relief block (83), and a spring element (84). The pressure relief pipe (81) is installed on the valve body (1) and communicates with the flow channel (4). The pressure relief port (82) is opened on the side wall of the pressure relief pipe (81). The pressure relief block (83) is slidably disposed in the pressure relief pipe (81). The pressure relief block (83) opens or closes the pressure relief port (82) by sliding. The spring element (84) is installed between the pressure relief pipe (81) and the pressure relief block (83). The spring element (84) drives the pressure relief block (83) to close the pressure relief port (82). A limiting ring (9) is fixedly provided in the pressure relief pipe (81). The pressure relief block (83) abuts against the limiting ring (9). The pressure relief port (82) is closed at the same time; an adjustment component (10) is provided inside the pressure relief pipe (81). The adjustment component (10) includes an adjustment block (101) and an adjustment screw (102). The adjustment block (101) is slidably disposed inside the pressure relief pipe (81). The end of the elastic element (84) away from the pressure relief block (83) abuts against the adjustment block (101). The adjustment screw (102) is threadedly connected to the pressure relief pipe (81) and abuts against the adjustment block (101). The elastic element (84) includes a rubber shell (841) and an internal spring (842). One end of the rubber shell (841) abuts against the adjustment block (101) and the other end abuts against the pressure relief block (83). The internal spring (842) is embedded in the rubber shell (841).

2. The self-relieving nuclear power plant shut-off valve according to claim 1, characterized in that: The pressure relief pipe (81) is connected to the pressure relief port (82) and connected to the return pipe (11). The return pipe (11) has an exhaust port (12). The end of the return pipe (11) away from the pressure relief pipe (81) is connected to the valve body (1) and connected to the flow channel (4).

3. A self-relieving nuclear power plant shut-off valve according to claim 2, characterized in that: A one-way valve (14) is installed on the return pipe (11), and the one-way valve (14) restricts the flow of material in the flow channel (4) to the return pipe (11).

4. A self-relieving nuclear power plant shut-off valve according to claim 3, characterized in that: A brush (15) is installed inside the return pipe (11).

5. A self-relieving nuclear power plant shut-off valve according to claim 4, characterized in that: A fixing ring (16) is installed at the exhaust port (12), and the brush (15) is fixed on the fixing ring (16).

6. A self-relieving nuclear power plant shut-off valve according to claim 5, characterized in that: The fixed ring (16) is rotatably disposed at the exhaust port (12).

7. A self-relieving nuclear power plant shut-off valve according to claim 6, characterized in that: The fixed ring (16) is hinged with several baffles (18), which open or close the fixed ring (16) by rotation.

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