A self-sealing stop valve for power station

Abstract

The present invention relates to a self-sealing stop valve for power stations, and relates to the technical field of valves, including a valve body, a valve cover, a driving end, a valve stem and a sealing component, wherein the valve cover is arranged on the valve body, the driving end is arranged on the valve cover, the valve stem is arranged on the driving end, a water inlet and a water outlet are provided on the valve body, and the sealing component comprises a valve core, a pressure cover, a pin, a spring, a sealing member and a valve seat, the valve seat is arranged on the valve body, a limiting portion is arranged on an end of the valve stem away from the driving end, the pressure cover is movably arranged on the limiting portion, the valve core is arranged on the pressure cover, pin holes are arranged at corresponding positions of the valve core and the pressure cover, the pin is arranged on the valve core through the pin hole, one end of the spring abuts on the valve core, the other end of the spring abuts on the valve stem, and the sealing member is arranged on the valve core for sealing the valve seat, and the present invention can achieve better sealing of the stop valve under high pressure through the sealing component, so that the stop valve has higher sealing reliability and stability, and meets the requirements of high parameter operation of power stations.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a self-sealing stop valve for power stations. Background Art

[0002] With the development of the power industry, especially in the fields of thermal power and nuclear power, the operating parameters of power stations are constantly increasing, such as high temperature, high pressure, high flow, etc. The stable operation of the power station system is crucial. The leakage or failure of any valve may cause the shutdown of the entire system or even a safety accident. Under such working conditions, the sealing performance and reliability of traditional stop valves face severe challenges. Self-sealing stop valves can achieve better sealing under high pressure to meet the needs of high-parameter operation of power stations. Self-sealing stop valves have higher sealing reliability and stability, which can effectively reduce the risk of leakage and ensure the stable operation of the power station system.

[0003] At present, a Chinese invention patent application with a publication date of February 11, 2025 and a publication number of CN 119412511A proposes a stop valve to solve the technical problems of low temperature and pressure upper limits and easy wear and leakage in the prior art. The stop valve disclosed in this application includes a valve body, a valve seat, a valve cover and a valve stem. The valve body includes a first channel and a second channel that are interconnected, and the valve seat is located at the connection between the first channel and the second channel. The valve seat and the valve cover are both detachably matched with the valve body, and the valve stem and the valve cover are slidably matched so that the valve stem can approach or move away from the valve seat. When the valve stem approaches the valve seat, the valve stem can cut off the first channel and the second channel. The various components of the stop valve disclosed in this application are detachably matched, so that the valve seat can be taken out for hard alloy surfacing, thereby greatly improving the operating temperature and pressure of the stop valve, and can effectively extend the service life of the stop valve.

[0004] However, if only one method is used to seal the stop valve, the sealing performance and reliability will face severe challenges under such working conditions. A single sealing method may not be able to provide stable sealing performance under extreme working conditions, such as high pressure difference and high flow rate.

[0005] Therefore, it is necessary to provide a self-sealing stop valve for a power station to solve the above problems. Summary of the invention

[0006] In order to enable the stop valve to achieve better sealing under high pressure, meet the requirements of high parameter operation of the power station, and make the stop valve have higher sealing reliability and stability, the present invention provides a self-sealing stop valve for a power station.

[0007] The present invention provides a self-sealing stop valve for power stations. The self-sealing stop valve for power stations comprises a valve body, a valve cover, a driving end, a valve stem and a sealing assembly. The valve cover is arranged on the valve body, the driving end is arranged on the valve cover, the valve stem is arranged on the driving end, a water inlet and a water outlet are provided on the valve body, the sealing assembly comprises a valve core, a pressure cover, a pin, a spring, a sealing member and a valve seat, the valve seat is arranged on the valve body, a limiting portion is arranged on an end of the valve stem away from the driving end, the pressure cover is movably arranged on the limiting portion, the valve core is arranged on the pressure cover, pin holes are arranged at corresponding positions of the valve core and the pressure cover, the pin is arranged on the valve core through the pin hole, one end of the spring abuts against the valve core, the other end of the spring abuts against the valve stem, and the sealing member is arranged on the valve core for sealing the valve seat.

[0008] The above-mentioned technical scheme in the embodiment of the present application has at least the following technical effects: during the use of the self-sealing stop valve, the driving end is driven by the handwheel to drive the valve stem to move downward, thereby driving the valve core to contact the valve seat, so that the seal on the valve core abuts against the valve seat, thereby performing the first stage of sealing, and then the valve stem continues to move downward to compress the spring, and the continuous pressure generated by the valve stem on the valve core is evenly dispersed through the spring, and the gap between the seal and the valve seat is continuously compressed to achieve the second stage of self-sealing.

[0009] In some embodiments, the seal comprises a hard seal ring, a first soft seal ring and a second soft seal ring, the hard seal ring is arranged on the valve seat, the first soft seal ring is arranged on the valve core, and the second soft seal ring is arranged on the hard seal ring.

[0010] In some embodiments, a sealing protrusion is provided on the first soft sealing ring, and a sealing groove is provided on the second soft sealing ring at a position corresponding to the sealing protrusion on the first soft sealing ring.

[0011] In some embodiments, the pin hole includes a first pin hole, a second pin hole and a third pin hole, the first pin hole is closer to the end face of the valve core away from the spring than the second pin hole, and the second pin hole is closer to the end face of the valve core away from the spring than the third pin hole.

[0012] In some embodiments, a guide sleeve is disposed on the valve seat, and a plurality of connecting through holes are opened on the guide sleeve.

[0013] In some embodiments, a connecting piece is disposed on the valve cover, and one end of the connecting piece away from the valve cover is disposed in the valve body. A first sealing ring and a second sealing ring are disposed on the connecting piece for sealing the gap between the connecting piece and the valve cover.

[0014] In some embodiments, a circular hole is opened on the connecting member, and the valve stem passes through the circular hole and moves up and down through the driving end. A bellows sealing assembly is arranged on the valve stem, and the bellows sealing assembly includes a bellows, an abutting disc, a first annular sealing gasket and a second annular sealing gasket. The abutting disc is arranged on the valve stem, and the bellows is sleeved on the valve stem. One end of the bellows abuts on the connecting member, and the other end of the bellows abuts on the abutting disc. The first annular sealing gasket is arranged on an end of the abutting disc close to the bellows, and the second annular sealing gasket is arranged on an end of the connecting member away from the valve cover, and the first annular sealing gasket and the second annular sealing gasket are the same size.

[0015] In some embodiments, the valve body is connected to the valve cover via a connecting hoop, and the connecting hoop includes a first connecting hoop and a second connecting hoop, the first connecting hoop and the second connecting hoop are both arranged on the valve body, and the first connecting hoop and the second connecting hoop are connected via a nut.

[0016] In some embodiments, a handwheel is provided on the driving end, and a handle is provided on the handwheel.

[0017] In some embodiments, a connecting hole is provided on the valve cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a self-sealing stop valve for a power station according to an embodiment of the present application; Figure 2 This is a schematic cross-sectional structure diagram of a self-sealing stop valve for a power station according to an embodiment of the present application; Figure 3 for Figure 2 Enlarged view of part A in the middle; Figure 4 for Figure 3 Enlarged view of middle part B; Figure 5 for Figure 2 Enlarged view of middle C; Figure 6 for Figure 2 Enlarged view of the middle D part; Figure 7 It is a schematic diagram of the three-dimensional structure of the guide sleeve according to an embodiment of the present application.

[0019] Among them, the reference numerals in the figure are: 1. Valve body; 11. Valve cover; 12. Driving end; 13. Water inlet; 14. Water outlet; 15. Hand wheel; 16. Handle; 17. Valve stem; 18. Limiting part; 19. Connecting hole; 2. Sealing assembly; 21. Valve core; 22. Gland; 23. Pin; 24. Pin hole; 241. First pin hole; 242. Second pin hole; 243. Third pin hole; 25. Spring; 26. Sealing element; 261. Hard sealing ring; 262. First soft sealing ring ; 263, second soft sealing ring; 264, sealing protrusion; 265, sealing groove; 27, valve seat; 3, guide sleeve; 31, connecting through hole; 4, bellows sealing assembly; 41, bellows; 42, abutting disc; 43, first circular ring sealing gasket; 44, second circular ring sealing gasket; 45, connecting piece; 5, connecting hoop; 51, first connecting hoop; 52, second connecting hoop; 53, nut; 6, first sealing ring; 61, second sealing ring. DETAILED DESCRIPTION

[0020] Based on this, in order to better enable the stop valve to achieve better sealing under high pressure, meet the requirements of high parameter operation of the power station, and make the stop valve have higher sealing reliability and stability, the embodiment of the present application provides the following solution.

[0021] Please also read Figures 1 to 7 The embodiment of the present application provides a self-sealing stop valve for a power station, which includes a valve body 1, a valve cover 11, a driving end 12, a valve stem 17 and a sealing assembly 2. The valve cover 11 is arranged on the valve body 1, the driving end 12 is arranged on the valve cover 11, the valve stem 17 is arranged on the driving end 12, a water inlet 13 and a water outlet 14 are opened on the valve body 1, and the sealing assembly 2 is arranged on the valve stem 17.

[0022] In some embodiments, please refer to Figure 1 to Figure 2 The valve body 1 is connected to the valve cover 11 through a connecting hoop 5. The connecting hoop 5 includes a first connecting hoop 51 and a second connecting hoop 52. The first connecting hoop 51 and the second connecting hoop 52 are both arranged on the valve body 1. The first connecting hoop 51 and the second connecting hoop 52 are connected through a nut 53. A hand wheel 15 is arranged on the driving end 12. A handle 16 is arranged on the hand wheel 15. A connecting hole 19 is opened on the valve cover 11 for facilitating heat dissipation of the stop valve and facilitating maintenance personnel to repair the stop valve.

[0023] With such arrangement, when the stop valve needs to be repaired, the nut 53 can be loosened, the first connecting hoop 51 and the second connecting hoop 52 can be removed, and the valve body 1 and the valve cover 11 can be separated, so that the connection between the valve body 1 and the valve cover 11 is more flexible, which is convenient for quick installation and removal. When maintenance or replacement of parts is required, the valve can be quickly removed, saving time and manpower. At the same time, the design of the connecting hoop 5 can provide good sealing performance. The tightening effect of the nut 53 ensures the sealing between the valve body 1 and the valve cover 11, effectively preventing leakage of the medium. This connection method has a certain adaptability to the vibration and thermal expansion of the pipeline system, and can reduce the vibration caused by temperature changes or vibration. The design of the handwheel 15 and the handle 16 makes the operation of the valve more intuitive and convenient. The maintenance personnel can easily control the opening and closing of the valve by manually rotating the handwheel 15. The operation of the handwheel 15 and the handle 16 avoids the use of external tools, which may cause misoperation or damage, thereby improving the safety of operation. The connecting hole 19 on the valve cover 11 is conducive to air circulation, which can effectively reduce the heat generated by friction or high-temperature media during the operation of the valve, thereby extending the service life of the valve. At the same time, the design of the connecting hole 19 provides a more convenient maintenance channel for maintenance personnel, which is convenient for checking and cleaning the internal components of the valve, reducing maintenance time and cost.

[0024] In some embodiments, please refer to Figures 2 to 4 The sealing assembly 2 includes a valve core 21, a gland 22, a pin 23, a spring 25, a sealing member 26 and a valve seat 27. The valve seat 27 is arranged on the valve body 1. A limiting portion 18 is arranged on the end of the valve stem 17 away from the driving end 12. The gland 22 is movably arranged on the limiting portion 18. The valve core 21 is arranged on the gland 22. Pin holes 24 are arranged at corresponding positions of the valve core 21 and the gland 22. The pin 23 is arranged on the valve core 21 through the pin hole 24. One end of the spring 25 abuts against the valve core 21. The spring 25 The other end abuts against the valve stem 17, and the sealing member 26 comprises a hard sealing ring 261, a first soft sealing ring 262 and a second soft sealing ring 263. The hard sealing ring 261 is arranged on the valve seat 27, the first soft sealing ring 262 is arranged on the valve core 21, the second soft sealing ring 263 is arranged on the hard sealing ring 261, a sealing protrusion 264 is arranged on the first soft sealing ring 262, and a sealing groove 265 is provided at a position corresponding to the sealing protrusion 264 on the second soft sealing ring 263 and the first soft sealing ring 262.

[0025] With such arrangement, during the use of the self-sealing stop valve, the driving end 12 is driven by the hand wheel 15 to drive the valve stem 17 to move downward, thereby driving the valve core 21 to contact the valve seat 27, so that the first soft sealing ring 262 on the valve core 21 abuts against the second soft sealing ring 263 of the valve seat 27, and the second soft sealing ring 263 is arranged on the hard sealing ring 261, thereby performing the first stage of sealing, and then the valve stem 17 continues to move downward to compress the spring 25, and the continuous pressure generated by the valve stem 17 on the valve core 21 is evenly dispersed by the spring 25, and the first soft sealing ring 262 and the second soft sealing ring 263 are continuously pressed, so that the sealing protrusion 264 on the first soft sealing ring 262 is meshed with the sealing groove 265 on the second soft sealing ring 263, and the bottom of the first soft sealing ring 262 abuts against the hard sealing ring 261, thereby realizing the second stage of self-sealing. In this way, the first-stage and second-stage sealing are achieved through the combination of the soft sealing ring and the hard sealing ring 261, and the auxiliary compression of the spring 25. This double sealing mechanism can effectively prevent medium leakage and maintain good sealing performance even under high pressure or high flow rate conditions. The meshing design of the first soft sealing ring 262 and the second soft sealing ring 263, and the contact between the soft sealing ring and the hard sealing ring 261, further enhance the reliability of the seal and reduce the risk of leakage caused by wear or aging of the seal 26. The action of the spring 25 enables the valve core 21 to automatically adjust the sealing pressure when the pressure changes, ensuring that the sealing effect is not affected by medium pressure fluctuations. This adaptability enables the valve to maintain stable sealing performance under different working conditions. The combined design of the soft sealing ring and the hard sealing ring 261 can adapt to a wider temperature range and is suitable for a variety of media and processes. The spring 25 can evenly disperse the pressure of the valve stem 17 on the valve core 21 to avoid excessive wear or damage of the seal 26 due to excessive local pressure, thereby extending the service life of the seal 26. The buffering effect of the spring 25 reduces the direct friction between the valve core 21 and the valve seat 27, reduces the wear rate, and further extends the overall service life of the valve. Even if the seal 26 needs to be replaced, due to the modular design of the sealing mechanism, maintenance personnel can quickly locate the problem and replace the damaged parts, reducing maintenance time and cost. The design of this self-sealing stop valve achieves high sealing reliability, strong adaptability and long service life through a multi-stage sealing mechanism and elastic compensation of the spring 25. It not only improves the safety and economy of the valve, but also simplifies the operation and maintenance process, and is suitable for a variety of complex industrial conditions.

[0026] In some embodiments, please refer to Figure 3 and Figure 7The pin hole 24 includes a first pin hole 241, a second pin hole 242 and a third pin hole 243. The distance between the first pin hole 241 and the end surface of the valve core 21 away from the spring 25 is smaller than that of the second pin hole 242. The distance between the second pin hole 242 and the end surface of the valve core 21 away from the spring 25 is smaller than that of the third pin hole 243. A guide sleeve 3 is provided on the valve seat 27, and a plurality of connecting through holes 31 are opened on the guide sleeve 3.

[0027] In this way, by setting three pin holes 24 of different heights on the valve core 21, in order to control the elastic force of the spring 25 through the pin holes 24 at different positions, when the first pin hole 241 is used, the restriction on the spring 25 is relatively small, and the elastic force of the spring 25 is large. When the second pin hole 242 is used, the restriction on the spring 25 is always, and the elastic force of the spring 25 is moderate. When the third pin hole 243 is used, the restriction on the spring 25 is large, and the spring 25 can apply a small elastic force. As the degree of use increases, the hardness of the first soft sealing ring 262 and the second soft sealing ring 263 changes. Through the pin holes 24 at different positions, it is convenient to control the application of the elastic force of the spring 25, so that the sealing protrusion 264 and the sealing groove 265 on the first soft sealing ring 262 and the second soft sealing ring 263 are better meshed. A plurality of through holes are opened on the outer periphery of the guide sleeve 3 to facilitate the circulation of the medium, and at the same time, a guiding effect is generated on the up and down movement of the valve stem 17 of the valve core 21 to achieve a stabilizing effect. In this way, by selecting pin holes 24 of different heights, the elastic force of spring 25 can be flexibly adjusted. The first pin hole 241 has a smaller restriction and a larger elastic force, which is suitable for initial working conditions requiring a larger sealing pressure; the second pin hole 242 has a moderate elastic force, which is suitable for normal working conditions; the third pin hole 243 has a larger restriction and a smaller elastic force, which is suitable for low elastic force requirements after the soft sealing ring is worn. As the degree of use increases, the hardness of the soft sealing ring will change. By adjusting the position of the pin hole 24, the elastic force of the spring 25 can be optimized to ensure that the sealing protrusion 264 and the sealing groove 265 of the sealing ring are always in a good meshing state, thereby extending the service life of the sealing ring. Through the combination of the soft sealing ring and the hard sealing ring 261, and the elastic compensation of the spring 25, double sealing is achieved. This design can effectively prevent medium leakage, even in Stable sealing performance can be maintained even under high pressure or high flow rate conditions. The elastic compensation function of the spring 25 can automatically adjust the sealing pressure according to the medium pressure and the state of the sealing ring to ensure the stability and reliability of the sealing performance. The through-hole design on the outer periphery of the guide sleeve 3 not only facilitates the circulation of the medium, but also provides a stable guiding effect when the valve core 21 and the valve stem 17 move up and down. This design reduces the shaking of the valve core 21 and the valve stem 17 and improves the dynamic stability of the valve. The stable guiding effect reduces unnecessary friction between the valve core 21 and the valve seat 27, reduces the wear rate, and further extends the service life of the valve. The optimization of the elastic force of the spring 25 can be achieved by simply adjusting the position of the pin hole 24 without the need for complex tools or equipment. This design makes valve maintenance easier and reduces downtime and maintenance costs.

[0028] In some embodiments, please refer to Figures 5 to 7The valve cover 11 is provided with a connecting piece 45, and one end of the connecting piece 45 away from the valve cover 11 is arranged in the valve body 1. The connecting piece 45 is provided with a first sealing ring 6 and a second sealing ring 61 for sealing the gap between the connecting piece 45 and the valve cover 11. A circular hole is opened on the connecting piece 45, and the valve stem 17 passes through the circular hole and moves up and down through the driving end 12. The valve stem 17 is provided with a bellows sealing assembly 4, and the bellows sealing assembly 4 includes a bellows 41, an abutting disc 42, and a first circular seal The gasket 43 and the second circular sealing gasket 44, the abutting disc 42 are arranged on the valve stem 17, the bellows 41 is sleeved on the valve stem 17, one end of the bellows 41 abuts on the connecting piece 45, and the other end of the bellows 41 abuts on the abutting disc, the first circular sealing gasket 43 is arranged on the end of the abutting disc close to the bellows 41, the second circular sealing gasket 44 is arranged on the end of the connecting piece 45 away from the valve cover 11, and the first circular sealing gasket 43 and the second circular sealing gasket 44 are the same size.

[0029] In this arrangement, the bellows 41 is arranged on the connecting piece 45 to seal the gap between the connecting piece 45 and the valve stem 17. At the same time, the bellows 41 is equivalent to the function of the spring 25, and can also reduce the shock of the valve stem 17 to a certain extent. The abutting disc 42 is used to abut the bellows 41. At the same time, the abutting disc 42 and the connecting piece 45 are provided with a first annular sealing gasket 43 and a second annular sealing gasket 44, which are used to reduce the collision friction generated when the abutting disc 42 contacts the connecting piece 45 during the up and down movement of the valve stem 17, thereby reducing unnecessary wear. When the stop valve is opened, when a large flow of medium passes through the stop valve, the first annular sealing gasket 43 and the second annular sealing gasket 44 can also be used to further seal the gap between the connecting piece 45 and the valve stem 17, and at the same time, the gap between the connecting piece 45 and the valve cover 11 is sealed through the first sealing ring 6 and the second sealing ring 61. In this way, the bellows 41 is not only used to seal the gap between the connector 45 and the valve stem 17, but also has the function of the spring 25, which can provide elastic compensation and reduce the leakage risk caused by the movement of the valve stem 17. The first circular seal 43 and the second circular seal 44 reduce the collision and friction between the abutment disc 42 and the connector 45 when the valve stem 17 moves up and down, and further seal the gap when a large flow medium passes through to ensure the sealing performance. The first sealing ring 6 and the second sealing ring 61 are used to seal the gap between the connector 45 and the valve cover 11, which further enhances the overall sealing effect. The elasticity of the bellows 41 can dampen the movement of the valve stem 17 and reduce the mechanical wear caused by the impact of the medium or the rapid movement of the valve stem 17. The abutment disc 42 is used to abut the bellows 41, and at the same time cooperates with the circular seal The sealing gasket reduces the wear of the contact surface and extends the service life of the seal 26. This design is suitable for working conditions of high pressure, large flow and corrosive media. The bellows 41 seal can effectively prevent leakage and reduce the corrosion of the medium to the valve stem 17 and the seal 26. The elastic compensation function of the bellows 41 makes the up and down movement of the valve stem 17 smoother, reduces the operating resistance, and improves the operating flexibility of the valve. The bellows 41 seal reduces the leakage risk and wear of traditional packing seals, reduces the maintenance frequency and cost, and the improvement of sealing performance effectively reduces medium leakage, meets environmental protection requirements, and avoids energy waste caused by leakage. The bellows 41 seal and multiple sealing structure can effectively prevent medium leakage, especially under high pressure and large flow conditions, further improving the safety of equipment operation.

[0030] The implementation principle of a self-sealing stop valve for a power station in the embodiment of the present application is: When the stop valve needs to be repaired, the nut 53 can be loosened, the first connecting hoop 51 and the second connecting hoop 52 can be removed, and the valve body 1 and the valve cover 11 can be separated, so that the connection between the valve body 1 and the valve cover 11 is more flexible, which is convenient for quick installation and disassembly. When maintenance or replacement of parts is required, the valve can be quickly disassembled to save time and manpower. The maintenance personnel can easily control the opening and closing of the valve by manually rotating the handwheel 15. The operation of the handwheel 15 and the handle 16 avoids the use of external tools. The connecting hole 19 on the valve cover 11 facilitates air circulation and can effectively reduce the heat generated by friction or high-temperature medium during the operation of the valve, thereby extending the service life of the valve. At the same time, the design of the connecting hole 19 provides a more convenient maintenance channel for maintenance personnel, which is convenient for checking and cleaning the internal components of the valve, reducing maintenance time and cost.

[0031] During use of the self-sealing stop valve, the driving end 12 is driven by the hand wheel 15 to drive the valve stem 17 to move downward, thereby driving the valve core 21 to contact the valve seat 27, so that the first soft sealing ring 262 on the valve core 21 abuts against the second soft sealing ring 263 of the valve seat 27, and the second soft sealing ring 263 is arranged on the hard sealing ring 261, thereby performing the first stage of sealing, and then the valve stem 17 continues to move downward to compress the spring 25, and the spring 25 evenly disperses the continuous pressure generated by the valve stem 17 on the valve core 21, and continuously presses the first soft sealing ring 262 and the second soft sealing ring 263, so that the sealing protrusion 264 on the first soft sealing ring 262 is meshed with the sealing groove 265 on the second soft sealing ring 263, and the bottom of the first soft sealing ring 262 abuts against the hard sealing ring 261, thereby achieving the second stage of self-sealing. By setting three pin holes 24 of different heights on the valve core 21, in order to control the elastic force of the spring 25 through the pin holes 24 at different positions, when the first pin hole 241 is used, the restriction on the spring 25 is relatively small, and the elastic force of the spring 25 is large. When the second pin hole 242 is used, the restriction on the spring 25 is always, and the elastic force of the spring 25 is moderate. When the third pin hole 243 is used, the restriction on the spring 25 is large, and the spring 25 can apply a small elastic force. As the degree of use increases, the hardness of the first soft sealing ring 262 and the second soft sealing ring 263 changes. Through the pin holes 24 at different positions, it is convenient to control the application of the elastic force of the spring 25, so that the sealing protrusion 264 and the sealing groove 265 on the first soft sealing ring 262 and the second soft sealing ring 263 are better meshed. A plurality of through holes are opened on the outer periphery of the guide sleeve 3 to facilitate the circulation of the medium, and at the same time, a guiding effect is exerted on the up and down movement of the valve stem 17 of the valve core 21 to achieve a stabilizing effect. By setting the bellows 41 on the connecting piece 45 to seal the gap between the connecting piece 45 and the valve stem 17, the bellows 41 is equivalent to the role of the spring 25, and can also reduce the shock of the valve stem 17 to a certain extent. The abutting disc 42 is used to abut the bellows 41. At the same time, the abutting disc 42 and the connecting piece 45 are provided with a first annular sealing gasket 43 and a second annular sealing gasket 44, which are used to reduce the collision friction generated when the abutting disc 42 contacts the connecting piece 45 during the up and down movement of the valve stem 17, thereby reducing unnecessary wear. When the stop valve is opened, when a large flow of medium passes through the stop valve, the first annular sealing gasket 43 and the second annular sealing gasket 44 can also be used to further seal the gap between the connecting piece 45 and the valve stem 17, and at the same time, the gap between the connecting piece 45 and the valve cover 11 is sealed through the first sealing ring 6 and the second sealing ring 61.

[0032] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-sealing stop valve for a power station, characterized in that: The invention comprises a valve body (1), a valve cover (11), a driving end (12), a valve stem (17) and a sealing assembly (2), wherein the valve cover (11) is arranged on the valve body (1), the driving end (12) is arranged on the valve cover (11), the valve stem (17) is arranged on the driving end (12), the valve body (1) is provided with a water inlet (13) and a water outlet (14), the sealing assembly (2) comprises a valve core (21), a gland (22), a pin (23), a spring (25), a sealing member (26) and a valve seat (27), the valve seat (27) is arranged on the valve body (1), the valve stem (17) is arranged on the driving end (12), the valve body (1) is provided with a water inlet (13) and a water outlet (14), the sealing assembly (2) comprises a valve core (21), a gland (22), a pin (23), a spring (25), a sealing member (26) and a valve seat (27), the valve seat (27) is arranged on the valve body (1), and the valve stem (17) is arranged on the driving end (12). ) is provided with a limiting portion (18) on one end away from the driving end (12); the gland (22) is movably provided on the limiting portion (18); the valve core (21) is provided on the gland (22); pin holes (24) are provided at corresponding positions of the valve core (21) and the gland (22); the pin (23) is provided on the valve core (21) through the pin hole (24); one end of the spring (25) abuts against the valve core (21); the other end of the spring (25) abuts against the valve stem (17); and the sealing member (26) is provided on the valve core (21) for sealing the valve seat (27).

2. A self-sealing stop valve for power station according to claim 1, characterized in that: The sealing member (26) comprises a hard sealing ring (261), a first soft sealing ring (262) and a second soft sealing ring (263); the hard sealing ring (261) is arranged on the valve seat (27); the first soft sealing ring (262) is arranged on the valve core (21); and the second soft sealing ring (263) is arranged on the hard sealing ring (261).

3. A self-sealing stop valve for power station according to claim 2, characterized in that: A sealing protrusion (264) is provided on the first soft sealing ring (262), and a sealing groove (265) is provided on the second soft sealing ring (263) at a position corresponding to the sealing protrusion (264) on the first soft sealing ring (262).

4. A self-sealing stop valve for power station according to claim 3, characterized in that: The pin hole (24) comprises a first pin hole (241), a second pin hole (242) and a third pin hole (243); the distance between the first pin hole (241) and the end surface of the valve core (21) away from the spring (25) is smaller than that between the second pin hole (242) and the end surface of the valve core (21) away from the spring (25) is smaller than that between the third pin hole (243).

5. A self-sealing stop valve for power station according to claim 4, characterized in that: A guide sleeve (3) is provided on the valve seat (27), and a plurality of connecting through holes (31) are provided on the guide sleeve (3).

6. A self-sealing stop valve for power station according to claim 5, characterized in that: The valve cover (11) is provided with a connecting piece (45), one end of the connecting piece (45) away from the valve cover (11) is arranged in the valve body (1), and the connecting piece (45) is provided with a first sealing ring (6) and a second sealing ring (61) for sealing a gap between the connecting piece (45) and the valve cover (11).

7. A self-sealing stop valve for power station according to claim 6, characterized in that: The connecting member (45) is provided with a circular hole, and the valve stem (17) passes through the circular hole and moves up and down through the driving end (12). The valve stem (17) is provided with a bellows sealing assembly (4), and the bellows sealing assembly (4) comprises a bellows (41), an abutting disc (42), a first circular sealing gasket (43) and a second circular sealing gasket (44). The abutting disc (42) is provided on the valve stem (17), and the bellows (41) is sleeved on the valve stem (17). On the rod (17), one end of the bellows (41) abuts against the connecting piece (45), and the other end of the bellows (41) abuts against the abutting disc. The first circular seal (43) is arranged on an end of the abutting disc close to the bellows (41), and the second circular seal (44) is arranged on an end of the connecting piece (45) away from the valve cover (11). The first circular seal (43) and the second circular seal (44) are of the same size.

8. A self-sealing stop valve for power station according to claim 7, characterized in that: The valve body (1) and the valve cover (11) are connected via a connecting hoop (5), wherein the connecting hoop (5) comprises a first connecting hoop (51) and a second connecting hoop (52), wherein the first connecting hoop (51) and the second connecting hoop (52) are both arranged on the valve body (1), and the first connecting hoop (51) and the second connecting hoop (52) are connected via a nut (53).

9. A self-sealing stop valve for power station according to claim 8, characterized in that: A hand wheel (15) is provided on the driving end (12), and a handle (16) is provided on the hand wheel (15).

10. A self-sealing stop valve for power station according to claim 9, characterized in that: The valve cover (11) is provided with a connecting hole (19).

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