Supercritical power station gate valve capable of resisting high-speed steam impact and strengthening protection

Abstract

The invention relates to the technical field of power station gate valves, in particular to a supercritical power station gate valve capable of resisting high-speed steam impact and strengthening protection, which comprises a valve body and a pressure-resistant protection device arranged in an inner cavity of the valve body, an air inlet pipe and an air outlet pipe are arranged on the two sides of the valve body respectively, a mounting seat is arranged at the top end of the valve body, a valve rod is slidably arranged on the mounting seat, and a valve clack is connected to the bottom of the valve rod. A linear driving assembly used for controlling the valve rod to ascend and descend is further arranged on the installation base. The pressure-resistant protection device comprises a valve cage, the valve cage is arranged in an inner cavity of the valve body, at least three throttling holes are formed in the valve cage, the multiple throttling holes are distributed in an annular array mode along the axis of the valve cage, a spiral resistance wing plate is arranged on the outer wall of the valve cage, and the valve clack is located in the valve cage. The function of improving the impact resistance of the supercritical power station gate valve is achieved, and the problem that a gate body cannot accurately control the medium flow due to the fact that a traditional supercritical power station gate valve hinders medium flow at the front section of the gate is solved.

Description

Technical Field

[0001] This invention relates to the field of power plant gate valve technology, specifically to a supercritical power plant gate valve with enhanced protection against high-speed steam impact. Background Technology

[0002] Supercritical power plant gate valves are a type of key valve specifically designed for supercritical power plants. Due to the high temperature and high pressure steam environment in supercritical power plants, the temperature of the medium passing through the valve can reach over 500℃ and the pressure can reach tens of megapascals. Therefore, it is necessary to ensure the valve's impact resistance to avoid damage caused by high-speed steam impact and to improve the valve's service life.

[0003] To address this, Chinese patent CN214404906U discloses a gate valve for a supercritical power plant. It comprises a water pipe, valve body, baffle plate, spring, leakage hole, regulating plate, regulating cylinder, and connecting pipe. Water flows from the regulating plate towards the valve body, impacting the regulating plate. When the water flow velocity is too high and the impact force is large, the impact force compresses the spring on the regulating plate, thereby reducing the effective area of ​​the interface between the regulating hole and the connecting pipe. This results in only a small amount of water entering the connecting pipe. After passing through the connecting pipe, the water flows away from the baffle plate. When the regulating cylinder is in place, the water flow velocity is normal, resulting in a small impact force on the gate valve body, thus protecting the gate valve body. When the water flow velocity is slow and insufficient to cause a large impact force, the impact force of the water flow on the regulating plate is small, the spring returns to its original position, and the effective area of ​​the interface between the regulating hole and the connecting pipe is maximized. The water flow velocity itself is not very fast, so the impact force on the gate valve body is naturally small. Through the coordinated action of the spring, regulating plate, regulating cylinder, and connecting pipe, the impact force of the water flow on the gate valve body is reduced, the possibility of damage to the gate valve body is reduced, and the service life of the gate valve body is increased.

[0004] However, while the impact of the medium can be controlled by installing a connecting pipe and regulating hole in front of the valve, during operation, the opening of the supercritical power plant gate valve usually needs to be adjusted according to the change of steam pressure to regulate the steam flow rate and adapt to the frequently changing power output requirements of the turbine unit. Therefore, the controllability of controlling the change of steam flow rate in front of the gate is poor. Once the medium pressure increases, it is blocked in front of the gate, and the steam flow rate cannot be accurately controlled by simply adjusting the opening of the supercritical power plant gate valve. Summary of the Invention

[0005] To address the aforementioned issues, a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact is provided. This valve solves the problem of traditional supercritical power plant gate valves obstructing medium flow in the upstream section, leading to inaccurate control of the medium flow rate by using a shell and a pressure-resistant protection device installed inside the shell.

[0006] To address the problems of existing technologies, this invention provides a supercritical power plant gate valve with enhanced protection against high-speed steam impact, comprising a valve body and a pressure-resistant protection device disposed within the valve body cavity; an inlet pipe and an outlet pipe are respectively provided on both sides of the valve body, and a mounting seat is provided at the top of the valve body, on which a valve stem is slidably disposed, and a valve disc is connected to the bottom of the valve stem; the mounting seat is also provided with a linear drive assembly for controlling the raising and lowering of the valve stem; the pressure-resistant protection device includes a valve cage disposed within the valve body cavity, the valve cage having at least three throttling orifices, the multiple throttling orifices being arranged in a circular array along the axis of the valve cage, and the outer wall of the valve cage being provided with spiral-shaped resistance wing plates, with at least two resistance wing plates, the multiple resistance wing plates being arranged in a circular array along the axis of the valve cage; the valve disc is located inside the valve cage.

[0007] Preferably, the valve cage is rotatably disposed within the inner cavity of the valve body; the valve body is also provided with a damping mechanism, which includes a fixed ring and a damping assembly; the fixed ring is connected to the top of the valve cage, and the axis of the fixed shaft is collinear with the axis of the valve cage; the damping assembly is used to impede the rotation of the fixed ring.

[0008] Preferably, the valve plate includes an inner rod and a sleeve; the inner rod is connected to the bottom end of the valve stem; the sleeve is sleeved on the outside of the inner rod, and the inner rod and the sleeve are in sliding fit; the sleeve is driven to the valve cage; in the working state, when the valve cage rotates under the impact of water vapor, the valve cage drives the sleeve, which is driven to move downward relative to the inner rod.

[0009] Preferably, the outer surface of the sleeve is provided with a groove that extends along the axial direction of the sleeve; the inner side of the valve cage is provided with a guide bar that extends along the axial direction of the valve cage and slides in cooperation with the groove of the sleeve; the outer wall of the inner rod is provided with an external thread, and the inner rod is threadedly connected to the sleeve; in the working state, when the linear drive assembly drives the valve plate to move down, the valve rod drives the inner rod and the sleeve to move down, and the sleeve pushes the valve cage to rotate.

[0010] Preferably, the damping assembly includes a support ring, a damping block, a first elastic element, and a second connecting ring; the first connecting ring is connected to the fixed ring; the support ring is connected to the valve body and is located in the inner cavity of the valve body; the damping block is slidably mounted on the support ring, and an arc surface is formed at one end of the damping block near the axis of the support ring; both ends of the first elastic element are connected to the damping block and the support ring respectively; the second connecting ring is drivenly connected to the fixed ring, and at least three abutment blocks are provided on the second connecting ring, with multiple abutment rings arranged in a ring array along the axis of the second connecting ring.

[0011] Preferably, a piston is connected to the bottom of the inner rod, and the piston fits tightly with the inner surface of the sleeve; and a one-way transmission assembly is provided inside the valve body, and the fixed ring is connected to the damping assembly through the one-way transmission assembly; in the working state, when the valve cage rotates due to the impact of water vapor, the valve cage drives the sleeve connected to it to move downward relative to the inner rod, forming a vacuum zone between the inner cavity of the sleeve and the piston.

[0012] Preferably, the unidirectional transmission assembly includes a mounting ring, a stop pawl, and a ratchet; the mounting ring is connected to a fixed ring; the stop pawl is disposed on the mounting ring; the ratchet is rotatably disposed on the mounting ring, the stop pawl is engaged with the ratchet, and the ratchet is connected to the damping assembly in a transmission manner.

[0013] Preferably, the linear drive assembly includes a bracket, a screw, and an adjusting handwheel; the bracket is mounted on a mounting base; the screw is rotatably mounted on the bracket; the adjusting handwheel is coaxially connected to the top end of the screw; and the screw is threadedly connected to the valve stem.

[0014] Preferably, the mounting base is provided with a guide assembly for guiding the movement of the valve stem. The guide assembly includes an extension plate and a guide rod. The extension plate is disposed on the valve stem. The guide rod is disposed on the mounting base and slides with the extension plate.

[0015] Preferably, the mounting base is equipped with a pressure gauge for detecting the internal air pressure of the valve body.

[0016] The advantages of this invention compared to the prior art are:

[0017] 1. This invention improves the impact resistance of supercritical power plant gate valves by using a shell and a pressure-resistant protection device installed inside the shell cavity. It solves the problem of traditional supercritical power plant gate valves obstructing medium flow at the gate's front end, leading to inaccurate control of the medium flow rate. High-speed steam enters the shell through the inlet pipe and is guided by the resistance wing plates on the outer wall of the valve cage, causing the steam to rotate. The resistance wing plates further impede the steam's impact energy. The steam is then injected into the valve cage through throttling orifices on its surface. These orifices are arranged in a ring along the valve cage's axis. The throttling orifices, through their flow direction positioning effect, cause multiple streams of steam to collide at the center of the valve cage, further consuming the steam's energy. This reduces the impact force on the valve disc inside the valve cage, increases its service life, and prevents the valve disc from being affected by high-pressure impacts, thus ensuring a smooth seal.

[0018] 2. This invention achieves the function of hindering the rotation of the valve cage through a fixed ring and a damping assembly. When the pressure of steam increases, the rotation of the valve cage, in conjunction with the damping mechanism, dissipates part of the impact force of the steam, thereby improving the valve body's impact resistance. After high-speed steam enters the housing through the inlet pipe, it is guided by the resistance wing plates on the outer wall of the valve cage, causing the steam to rotate. At the same time, the resistance wing plates are subjected to the impact force of the steam. When the impact force exceeds the resistance provided by the damping assembly, it pushes the resistance wing plates to rotate. The resistance wing plates drive the valve cage and the fixed ring to rotate, thereby dissipating the impact energy of the steam through the resistance wing plates and the damping mechanism.

[0019] 3. This invention achieves the function of automatically adjusting the valve opening during the transmission process through the inner rod and sleeve, thereby automatically controlling the valve to move further downward and reduce the steam flow when the steam pressure suddenly increases. By using the inner rod and sleeve, when the steam pressure increases, the pressure of the steam drives the sleeve to further reduce the steam passage efficiency, thus stabilizing the steam transmission efficiency and ensuring a stable steam supply. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the connection between a gate valve and a balancing valve in a supercritical power plant, which is designed to withstand high-speed steam impact.

[0021] Figure 2 This is a three-dimensional schematic diagram of a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0022] Figure 3 This is a cross-sectional schematic diagram of a supercritical power plant gate valve with enhanced protection against high-speed steam impact.

[0023] Figure 4 This is a three-dimensional schematic diagram of a pressure protection device for a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0024] Figure 5 This is a three-dimensional exploded diagram of the pressure protection device and damping mechanism in a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0025] Figure 6 This is a three-dimensional schematic diagram of a damping mechanism in a supercritical power plant gate valve designed for enhanced protection against high-speed steam impact.

[0026] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle.

[0027] Figure 8 This is a three-dimensional exploded view of a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0028] Figure 9 This is a three-dimensional schematic diagram of the linear drive assembly, guide assembly, and mounting base in a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0029] Figure 10 This is a three-dimensional schematic diagram of the cooperation between the linear drive component and the guide component in a supercritical power plant gate valve with enhanced protection against high-speed water vapor impact.

[0030] The labels in the diagram are as follows: 1-Valve body; 11-Inlet pipe; 12-Outlet pipe; 13-Mounting base; 131-Valve stem; 132-Valve disc; 1321-Inner rod; 1322-Sleeve; 1321-Slide groove; 1323-Piston; 133-Pressure gauge; 14-Linear drive assembly; 141-Bracket; 142-Screw; 143-Adjusting handwheel; 15-Guide assembly; 151-Extension plate; 152-Guide rod; 1521-Limit block ; 2-Pressure protection device; 21-Valve cage; 211-Throttle orifice; 212-Guide bar; 22-Drag wing plate; 3-Damping mechanism; 31-Fixing ring; 32-Damping assembly; 321-Support ring; 322-Damping block; 323-First elastic element; 324-Second connecting ring; 3241-Abutting block; 33-One-way transmission assembly; 331-Mounting ring; 332-Stop pawl; 333-Ratchet; 4-Connecting flange; 5-Balance valve. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] Reference Figures 1-4 A supercritical power plant gate valve with enhanced protection against high-speed steam impact includes a valve body 1 and a pressure-resistant protection device 2 disposed within the inner cavity of the valve body 1. An inlet pipe 11 and an outlet pipe 12 are respectively provided on both sides of the valve body 1. A mounting seat 13 is provided at the top of the valve body 1, and a valve stem 131 is slidably mounted on the mounting seat 13. A valve disc 132 is connected to the bottom of the valve stem 131. A linear drive assembly 14 for controlling the raising and lowering of the valve stem 131 is also provided on the mounting seat 13. The pressure-resistant protection device 2 includes a valve cage 21, which is disposed within the inner cavity of the valve body 1. At least three throttling orifices 211 are provided on the valve cage 21, and the multiple throttling orifices 211 are arranged in a ring array along the axis of the valve cage 21. Spiral resistance wing plates 22 are provided on the outer wall of the valve cage 21, and at least two resistance wing plates 22 are provided, arranged in a ring array along the axis of the valve cage 21. The valve disc 132 is located inside the valve cage 21.

[0033] This invention improves the impact resistance of supercritical power plant gate valves by using a valve body 1 and a pressure-resistant protection device 2 installed inside the valve body 1. It solves the problem of traditional supercritical power plant gate valves obstructing medium flow at the front of the gate, leading to inaccurate control of the medium flow rate. Connecting flanges 4 for connecting pipelines are provided at both the front and rear of the valve body 1, with one of the flanges 4 connected to a balancing valve 5. The outer side of the valve disc 132 has a hard alloy weld overlay layer of at least 8mm, providing excellent sealing. The valve cage 21 is made of high-quality stainless steel treated with xenon gas. When regulating the steam flow rate, the operator controls the valve stem 131 to rise and fall using a linear drive assembly 14. The valve stem 131 moves the valve disc 132, which blocks part of the throttling orifice 211 on the valve cage 21, thereby regulating the steam flow rate. After high-speed water vapor enters the valve body 1 through the inlet pipe 11, it is guided by the resistance wing plate 22 on the outer wall of the valve cage 21, causing the water vapor to rotate. The resistance wing plate 22 also hinders the water vapor, consuming its impact energy. The water vapor is then injected into the valve cage 21 through the throttling holes 211 on the surface of the valve cage 21. The multiple throttling holes 211 on the surface of the valve cage 21 are arranged in a ring array along the axis of the valve cage 21. Through the flow direction positioning effect of the throttling holes 211, multiple streams of water vapor collide with each other at the center of the valve cage 21, further consuming the energy of the water vapor. This reduces the impact force on the valve disc 132 inside the valve cage 21, improves the service life of the valve disc 132, and prevents the valve disc 132 from being affected by high-pressure impact, thus ensuring its sealing performance.

[0034] Reference Figure 3 and Figure 4 The valve cage 21 is rotatably disposed in the inner cavity of the valve body 1; the valve body 1 is also provided with a damping mechanism 3, which includes a fixed ring 31 and a damping assembly 32; the fixed ring 31 is connected to the top of the valve cage 21, and the axis of the fixed shaft is collinear with the axis of the valve cage 21; the damping assembly 32 is used to impede the rotation of the fixed ring 31.

[0035] This invention achieves the function of hindering the rotation of the valve cage 21 through the fixed ring 31 and the damping component 32. When the pressure of water vapor increases, the rotation of the valve cage 21, in conjunction with the damping mechanism 3, dissipates part of the impact force of the water vapor, thereby improving the impact resistance of the valve body 1. After high-speed water vapor enters the housing through the air inlet pipe 11, it is guided by the resistance wing plate 22 on the outer wall of the valve cage 21, causing the water vapor to rotate. At the same time, the resistance wing plate 22 is subjected to the impact force of the water vapor. When the impact force exceeds the resistance provided by the damping component 32, it pushes the resistance wing plate 22 to rotate. The resistance wing plate 22 drives the valve cage 21 and the fixed ring 31 to rotate, thereby consuming the impact energy of the water vapor through the resistance wing plate 22 and the damping mechanism 3.

[0036] Reference Figures 2-5The valve plate includes an inner rod 1321 and a sleeve 1322; the inner rod 1321 is connected to the bottom end of the valve stem 131; the sleeve 1322 is sleeved on the outside of the inner rod 1321, and the inner rod 1321 and the sleeve 1322 are in sliding fit; the sleeve 1322 is drivenly connected to the valve cage 21; in the working state, when the valve cage 21 rotates under the impact of water vapor, the valve cage 21 drives the sleeve 1322, which is drivenly connected to it, to move downward relative to the inner rod 1321.

[0037] The present invention realizes the function of automatically adjusting the opening of valve disc 132 during the transmission process through inner rod 1321 and sleeve 1322, so as to achieve the effect of automatically controlling valve disc 132 to move further down to reduce water vapor flow when water vapor pressure suddenly increases. After high-speed water vapor enters the housing through the inlet pipe 11, it is guided by the resistance wing plate 22 on the outer wall of the valve cage 21, causing the water vapor to rotate. At the same time, the resistance wing plate 22 is subjected to the impact force of the water vapor. When the impact force exceeds the resistance provided by the damping component 32, it pushes the resistance wing plate 22 to rotate. The resistance wing plate 22 drives the valve cage 21 and the fixed ring 31 to rotate. After the valve cage 21 rotates, it drives the sleeve 1322 connected to it to move down relative to the inner rod 1321. The sleeve 1322 further blocks the throttling hole 211 on the surface of the valve cage 21, reducing the flow rate of water vapor. Water vapor is sprayed into the valve cage 21 through the throttling hole 211 on the surface of the valve cage 21. Through the flow direction positioning effect of the throttling hole 211, multiple streams of water vapor collide with each other at the center of the valve cage 21, further consuming the energy of the water vapor and reducing the impact force on the valve disc 132 inside the valve cage 21. By setting the inner rod 1321 and the sleeve 1322, when the water vapor pressure increases, the pressure of the water vapor drives the sleeve 1322 to further reduce the water vapor passage efficiency, thereby stabilizing the water vapor transmission efficiency and stabilizing the supply of water vapor.

[0038] Reference Figure 5 The outer surface of the sleeve 1322 is provided with a sliding groove 1321, which extends along the axial direction of the sleeve 1322; the inner side of the valve cage 21 is provided with a guide bar 212, which extends along the axial direction of the valve cage 21 and slides with the sliding groove 1321 of the sleeve 1322; the outer wall of the inner rod 1321 is provided with an external thread, and the inner rod 1321 is threadedly connected to the sleeve 1322; in the working state, when the linear drive assembly 14 drives the valve plate to move down, the valve rod 131 drives the inner rod 1321 and the sleeve 1322 to move down, and the sleeve 1322 pushes the valve cage 21 to rotate.

[0039] This invention achieves the function of extending and retracting the sleeve 1322 by rotating the valve cage 21 through the sliding groove 1321 on the sleeve 1322 and the guide bar 212 on the valve cage 21. When the drag wing plate 22 is impacted by water vapor, when the impact force exceeds the resistance provided by the damping component 32, it pushes the drag wing plate 22 and the valve cage 21 to rotate. When the valve cage 21 rotates, it drives the sleeve 1322 to rotate synchronously through the cooperation of the guide bar 212 and the sliding groove 1321. The sleeve 1322 is threadedly connected to the inner rod 1321, and the inner rod 1321 is connected to the valve stem 131, which restricts the rotation of the inner rod 1321. When the sleeve 1322 rotates relative to the inner rod 1321, the sleeve 1322 moves downward relative to the inner rod 1321, and the sleeve 1322 further blocks the throttling hole 211 on the surface of the valve cage 21, reducing the flow rate of water vapor.

[0040] Reference Figure 6 and Figure 7 The damping assembly 32 includes a support ring 321, a damping block 322, a first elastic element 323, and a second connecting ring 324. The first connecting ring is connected to the fixed ring 31. The support ring 321 is connected to the valve body 1 and is located in the inner cavity of the valve body 1. The damping block 322 is slidably mounted on the support ring 321, and an arc surface is provided at one end of the damping block 322 near the axis of the support ring 321. The two ends of the first elastic element 323 are respectively connected to the damping block 322 and the support ring 321. The second connecting ring 324 is drivenly connected to the fixed ring 31, and at least three abutment blocks 3241 are provided on the second connecting ring 324. The multiple abutment rings are distributed in a ring array along the axis of the second connecting ring 324.

[0041] This invention provides resistance to the rotation of the fixed ring 31 through a support ring 321, a damping block 322, a first elastic element 323, and a second connecting ring 324. When the resistance wing plate 22 on the outside of the valve cage 21 rotates due to the impact of water vapor, the valve cage 21 drives the fixed ring 31 to rotate. The fixed ring 31 drives the second connecting ring 324, which is connected to it, to rotate. The second connecting ring 324 drives the abutment block 3241 to rotate. After the abutment block 3241 contacts the arc surface of the damping block 322, it presses against the damping block 322, thereby overcoming the elastic force of the first elastic element 323 and pushing the damping block 322 to move until the next abutment block 3241 contacts the damping block 322. The expansion and contraction of the first elastic element 323 then forms the valve cage. The rotation of 21 provides resistance, and after the valve cage 21 rotates, it drives the sleeve 1322 connected to it to move downward relative to the inner rod 1321. The sleeve 1322 further blocks the throttling hole 211 on the surface of the valve cage 21, reducing the flow rate of water vapor. Water vapor is injected into the valve cage 21 through the throttling hole 211 on the surface of the valve cage 21. Through the flow direction positioning effect of the throttling hole 211, multiple streams of water vapor collide with each other at the center of the valve cage 21, further consuming the energy of the water vapor and reducing the impact force on the valve disc 132 inside the valve cage 21.

[0042] Reference Figures 5-7 The bottom of the inner rod 1321 is connected to the piston 1323, which is in close contact with the inner surface of the sleeve 1322; and the valve body 1 is provided with a one-way transmission assembly 33, and the fixed ring 31 is connected to the damping assembly 32 through the one-way transmission assembly 33; in the working state, when the valve cage 21 is rotated by the impact of water vapor, the valve cage 21 drives the sleeve 1322 connected to it to move down relative to the inner rod 1321, forming a vacuum zone between the inner cavity of the sleeve 1322 and the piston 1323.

[0043] The present invention improves the connection sealing between the inner rod 1321 and the sleeve 1322 by setting the piston 1323. As a result, when the sleeve 1322 is driven to move by the rotation of the valve cage 21, a vacuum zone is formed between the inner cavity of the sleeve 1322 and the piston 1323, providing resistance to the movement of the sleeve 1322. When the water vapor pressure increases above the threshold, it overcomes the resistance of the damping component 32 and drives the valve cage 21 to rotate. This, in turn, causes the sleeve 1322 to rotate. The relative rotation between the sleeve 1322 and the inner rod 1321 drives the sleeve 1322 to move downwards. During this downward movement, because the piston 1323 and the inner wall of the sleeve 1322 are tightly fitted, and there is no air between them, the space between the piston 1323 and the bottom wall of the sleeve 1322 increases, creating a vacuum zone. This vacuum zone provides resistance to the movement of the sleeve 1322. Simultaneously, the sleeve 1322 drives the valve cage 21 and the fixed ring 31 to rotate in the forward direction. The fixed ring 31 is connected to the damping component via the one-way transmission component 33. The 32 transmission connection, through the resistance provided by the damping component 32, further hinders the rotation of the fixed ring 31 and the valve cage 21. After the water vapor pressure no longer continues to increase, the sleeve 1322 is pulled, and the volume of the vacuum zone no longer increases. When the water vapor pressure decreases and recovers, under the action of the air pressure difference, the sleeve 1322 is subjected to pressure that moves towards the inner rod 1321, causing the sleeve 1322 to move closer to the inner rod 1321. Since the sleeve 1322 and the inner rod 1321 are threadedly connected, the sleeve 1322 will rotate in the opposite direction during the movement. When the sleeve 1322 rotates in the opposite direction, it drives the sleeve 1322 and the fixed ring 31 to rotate in the opposite direction. When the fixed ring 31 rotates in the opposite direction, it will not be connected to the damping component 32 through the one-way transmission component 33 until the sleeve 1322 is reset.

[0044] Reference Figures 6-8The one-way transmission assembly 33 includes a mounting ring 331, a stop pawl 332, and a ratchet 333; the mounting ring 331 is connected to the fixed ring 31; the stop pawl 332 is disposed on the mounting ring 331; the ratchet 333 is rotatably disposed on the mounting ring 331, the stop pawl 332 is engaged with the ratchet 333, and the ratchet 333 is connected to the damping assembly 32 in a transmission connection.

[0045] This invention achieves the function of unidirectional connection between the damping assembly 32 and the fixed ring 31 through the mounting ring 331, the stop pawl 332, and the ratchet 333. The ratchet 333 is coaxially connected to the second connecting ring 324. When the valve cage 21 rotates forward under the action of air pressure, it drives the sleeve 1322 to rotate synchronously. The sleeve 1322 drives the valve cage 21 and the fixed ring 31 to rotate forward, and the fixed ring 31 drives the mounting ring 331 and the stop pawl 332 to rotate. When the stop pawl 332 rotates forward, it drives the ratchet 333, which is engaged with it, to rotate. The ratchet 333 drives the second connecting ring 324 to rotate, and then the resistance provided by the damping assembly 32 further hinders the rotation of the fixed ring 31 and the valve cage 21. After the water vapor pressure no longer increases, the sleeve 1322 is pulled, and the volume of the vacuum zone no longer increases. When the water vapor... After the pressure decreases and then recovers, under the influence of the air pressure difference, the sleeve 1322 is subjected to pressure that moves towards the inner rod 1321, causing the sleeve 1322 to move closer to the inner rod 1321. Since the sleeve 1322 and the inner rod 1321 are threaded together, the sleeve 1322 will rotate in the opposite direction during movement. This rotation of the sleeve 1322 in the opposite direction causes both the sleeve 1322 and the fixing ring 31 to rotate in the opposite direction. The fixing ring 31, in turn, causes the mounting ring 331 to rotate in the opposite direction. However, the stop pawl 332, when rotating in the opposite direction, will not drive the ratchet 333 to rotate, thus avoiding the resistance of the damping component 32, allowing the sleeve 1322 to smoothly reset. In summary, when the sleeve 1322 rotates in the forward direction, it is subjected to two resistances: the air pressure resistance of the vacuum zone and the resistance of the damping component 32. However, when resetting, the sleeve 1322 is not subjected to these two resistances and will actively reset under the influence of air pressure.

[0046] Reference Figures 6-8 The linear drive assembly 14 includes a bracket 141, a screw 142, and an adjusting handwheel 143. The bracket 141 is mounted on the mounting base 13. The screw 142 is rotatably mounted on the bracket 141. The adjusting handwheel 143 is coaxially connected to the top end of the screw 142. The screw 142 is threadedly connected to the valve stem 131.

[0047] This invention achieves the function of driving the valve disc 132 to move through the bracket 141, screw 142, and adjusting handwheel 143. When adjusting the steam flow rate, the operator first holds and rotates the adjusting handwheel 143, which drives the screw 142 to rotate. The screw 142 drives the valve stem 131, which is threaded to it, to move. The valve stem 131 drives the valve disc 132 to move, thereby blocking the throttling orifice 211 of the valve cage 21 through the valve disc 132, thus adjusting the steam flow rate.

[0048] Reference Figure 9 and Figure 10 The mounting base 13 is provided with a guide assembly 15 for guiding the movement of the valve stem 131. The guide assembly 15 includes an extension plate 151 and a guide rod 152. The extension plate 151 is disposed on the valve stem 131. The guide rod 152 is disposed on the mounting base 13 and slides with the extension plate 151.

[0049] This invention achieves the function of guiding the movement of the valve stem 131 through the extension plate 151 and the guide rod 152. In order to ensure the stable movement of the valve stem 131 and avoid excessive friction between the valve stem 131 and the mounting base 13, a guide assembly 15 is provided for guiding the movement of the valve stem 131. When the valve stem 131 is controlled to move by the linear drive assembly 14, the screw 142 is driven to rotate by rotating the adjusting handwheel 143. The screw 142 drives the valve stem 131, which is threaded to it, to move. During this process, the valve stem 131 is guided to move by the sliding engagement of the guide rod 152 and the extension plate 151.

[0050] Reference Figure 2 The mounting base 13 is equipped with a pressure gauge 133 for detecting the internal air pressure of the valve body 1.

[0051] This invention uses a pressure gauge 133 to detect the air pressure inside the valve body 1. To avoid safety accidents caused by excessive air pressure inside the valve body 1, a pressure gauge 133 for detecting the air pressure inside the valve body 1 is provided on the mounting base 13. During operation, the operator obtains the air pressure inside the valve body 1 by observing the value on the pressure gauge 133, and then takes timely action when the air pressure is abnormal.

[0052] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A supercritical power plant gate valve with enhanced protection against high velocity water vapor impact, characterized in that, It includes a valve body (1) and a pressure protection device (2) disposed in the inner cavity of the valve body (1); The valve body (1) has an air inlet pipe (11) and an air outlet pipe (12) on both sides respectively. The valve body (1) has a mounting seat (13) at the top. A valve stem (131) is slidably mounted on the mounting seat (13). A valve disc (132) is connected to the bottom of the valve stem (131). The mounting base (13) is also provided with a linear drive assembly (14) for controlling the raising and lowering of the valve stem (131); The pressure protection device (2) includes a valve cage (21), which is installed in the inner cavity of the valve body (1). At least three throttling holes (211) are provided on the valve cage (21). Multiple throttling holes (211) are arranged in a ring array along the axis of the valve cage (21). The outer wall of the valve cage (21) is provided with a spiral resistance wing plate (22). At least two resistance wing plates (22) are provided. Multiple resistance wing plates (22) are arranged in a ring array along the axis of the valve cage (21). The valve disc (132) is located inside the valve cage (21).

2. A supercritical power plant gate valve with enhanced protection against high velocity water vapor impact according to claim 1, characterized in that, The valve cage (21) is rotatably disposed in the inner cavity of the valve body (1); The valve body (1) is also provided with a damping mechanism (3), which includes a fixed ring (31) and a damping assembly (32); The fixing ring (31) is connected to the top of the valve cage (21), and the axis of the fixing shaft is collinear with the axis of the valve cage (21); The damping component (32) is used to impede the rotation of the fixed ring (31).

3. A supercritical power plant gate valve with enhanced protection against high velocity water vapor impact according to claim 1, characterized in that, The valve plate includes an inner rod (1321) and a sleeve (1322); The inner rod (1321) is connected to the bottom end of the valve stem (131); The sleeve (1322) is fitted onto the outside of the inner rod (1321), and the inner rod (1321) and the sleeve (1322) are in sliding fit. The sleeve (1322) is connected to the valve cage (21) via a transmission. In operation, when the valve cage (21) rotates under the impact of water vapor, the valve cage (21) drives the sleeve (1322) connected to it to move downward relative to the inner rod (1321).

4. A supercritical power plant gate valve with enhanced protection against high velocity water attack according to claim 3, characterized in that, The outer surface of the sleeve (1322) is provided with a groove (1321), which extends along the axial direction of the sleeve (1322); The inner side of the valve cage (21) is provided with a guide bar (212), which extends along the axial direction of the valve cage (21) and slides in cooperation with the groove (1321) of the sleeve (1322). The outer wall of the inner rod (1321) is provided with external threads, and the inner rod (1321) is threadedly connected to the sleeve (1322); In operation, when the linear drive assembly (14) drives the valve plate to move down, the valve stem (131) drives the inner rod (1321) and the sleeve (1322) to move down, and the sleeve (1322) pushes the valve cage (21) to rotate.

5. A supercritical power plant gate valve reinforced for protection against high velocity water vapor impact according to any one of claims 2-4, characterized in that, The damping assembly (32) includes a support ring (321), a damping block (322), a first elastic element (323), and a second connecting ring (324); A first connecting ring is connected to the fixed ring (31); The support ring (321) is connected to the valve body (1), and the support ring (321) is located in the inner cavity of the valve body (1); The damping block (322) is slidably mounted on the support ring (321), and the end of the damping block (322) near the axis of the support ring (321) has an arc surface; The two ends of the first elastic element (323) are connected to the damping block (322) and the support ring (321) respectively; The second connecting ring (324) is connected to the fixed ring (31) in a transmission manner, and the second connecting ring (324) is provided with at least three abutting blocks (3241), and the multiple abutting rings are distributed in a ring array along the axis of the second connecting ring (324).

6. A supercritical power plant gate valve with enhanced protection against high-speed steam impact as described in claim 3 or 4, characterized in that, The bottom of the inner rod (1321) is connected to a piston (1323), and the piston (1323) is in close contact with the inner surface of the sleeve (1322); Furthermore, the valve body (1) is equipped with a one-way transmission assembly (33), and the fixed ring (31) is connected to the damping assembly (32) through the one-way transmission assembly (33); When the valve cage (21) rotates due to the impact of water vapor during operation, the valve cage (21) drives the sleeve (1322) connected to it to move downward relative to the inner rod (1321), forming a vacuum zone between the inner cavity of the sleeve (1322) and the piston (1323).

7. A supercritical power plant gate valve with enhanced protection against high velocity water vapor impact according to claim 6, characterized in that, The one-way drive assembly (33) includes a mounting ring (331), a stop pawl (332), and a ratchet (333); The mounting ring (331) is connected to the fixing ring (31); The stop pawl (332) is mounted on the mounting ring (331); The ratchet (333) is rotatably mounted on the mounting ring (331), the stop pawl (332) is engaged with the ratchet (333), and the ratchet (333) is connected to the damping assembly (32) in a transmission manner.

8. A supercritical power plant gate valve reinforced for protection against high velocity water vapor impact according to any one of claims 1-4, characterized in that, The linear drive assembly (14) includes a bracket (141), a screw (142), and an adjusting handwheel (143); The bracket (141) is mounted on the mounting base (13); The screw (142) is rotatably mounted on the bracket (141); The adjusting handwheel (143) is coaxially connected to the top of the screw (142); The screw (142) is threadedly connected to the valve stem (131).

9. A supercritical power plant gate valve reinforced for protection against high velocity water impact according to claim 8, characterized in that, The mounting base (13) is provided with a guide assembly (15) for guiding the movement of the valve stem (131), the guide assembly (15) including an extension plate (151) and a guide rod (152); An extension plate (151) is mounted on the valve stem (131); The guide rod (152) is mounted on the mounting base (13) and slides with the extension plate (151).

10. A supercritical power plant gate valve with enhanced protection against high velocity water vapor impact according to claim 1, characterized in that, The mounting base (13) is equipped with a pressure gauge (133) for detecting the internal air pressure of the valve body (1).

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