A fixed cone pressure relief valve
Patent Information
- Application Number
- CN202611051355.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-15
- Publication Date
- 2026-08-18
AI Technical Summary
[0004]因此，本发明要解决的技术问题在于克服现有技术中的闸板式等常规泄压阀存在诸多固有技术缺陷，高水头大流量工况下驱动扭矩大、启闭响应慢，难以满足快速泄压要求，闸板边缘易形成高速射流引发气蚀，导致磨损严重、密封失效，同时水流集中消能效果差，需额外修建消能设施，且闸板易振动偏斜，进一步加剧磨损卡涩，影响电站安全运行的问题，从而提供一种固定锥形泄压阀
1.通过内筒管、套筒闸、导流肋板、反向导流锥、波纹套筒、驱动启闭组件、以及自润滑组件的设置，使得本固定锥形泄压阀在使用时能够克服传统闸板式泄压阀的固有缺陷，实现水力完全平衡，大幅降低驱动扭矩，提升启闭响应速度，实现高效自消能，避免高速局部射流引发的气蚀破坏，波纹套筒全程包裹内筒管的外滑动面，彻底隔绝泥沙水垢等杂质，同时形成独立密封腔防止润滑油脂被水流稀释冲走，自润滑组件随阀门启闭自动完成定量注脂，在内筒管表面形成均匀油膜，无需人工停机维护，缓解滑动卡涩问题。
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Figure CN122590048A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure relief valve technology, and specifically to a fixed conical pressure relief valve. Background Technology
[0002] During the operation of a hydropower station, when the generating unit experiences abnormal shutdown conditions such as load shedding, the rapid closure of the guide vanes can cause a sharp increase in pressure within the water intake pipeline, generating destructive water hammer. It is essential to quickly release excess water using a pressure relief device to ensure the safety of the pipeline system and generating equipment. Existing hydropower stations commonly use conventional pressure relief valves such as gate valves and butterfly valves as their core pressure relief equipment, with gate valves being the most widely used. Their basic working principle involves a drive mechanism that moves a gate valve up and down perpendicular to the water flow direction, achieving full opening or full closing of the valve. Some regulating gate valves can adjust the discharge flow rate by controlling the gate opening. These valves have a simple structure and low manufacturing cost, and are widely used in small and medium-head hydropower stations, while also serving as auxiliary pressure relief equipment in some large power stations.
[0003] Existing conventional pressure relief valves, such as gate valves, have inherent technical defects that are difficult to overcome. Under high head and high flow conditions, the gate is subjected to a huge pressure difference, resulting in a sharp increase in driving torque. This necessitates the use of large actuators with slow opening and closing response times, failing to meet the stringent requirements of rapid pressure relief in hydropower stations. High-speed local jets easily form at the gate edges, causing severe cavitation damage, leading to rapid wear of the gate and valve seat, and a sharp decline in sealing performance. Furthermore, the concentrated water flow during discharge results in poor energy dissipation, causing severe scouring of the downstream riverbed and requiring the construction of complex additional energy dissipation facilities. In addition, the gate is prone to vibration and deflection under high-speed water flow, further exacerbating wear and jamming risks, seriously affecting the safe and stable operation of the power station. Summary of the Invention
[0004] Therefore, the technical problem to be solved by the present invention is to overcome the many inherent technical defects of conventional pressure relief valves such as gate valves in the prior art. Under high head and high flow conditions, the driving torque is large and the opening and closing response is slow, making it difficult to meet the requirements of rapid pressure relief. The gate edge is prone to forming high-speed jets that cause cavitation, resulting in severe wear and sealing failure. At the same time, the concentrated water flow has poor energy dissipation effect, requiring the construction of additional energy dissipation facilities. Furthermore, the gate is prone to vibration and skew, which further aggravates wear and jamming, affecting the safe operation of the power station. Therefore, the present invention provides a fixed cone pressure relief valve.
[0005] To solve the above-mentioned technical problems, the present invention provides a fixed conical pressure relief valve, comprising: a valve body connecting plate, an inner tube coaxially fixedly installed at one end of the valve body connecting plate, and a sleeve gate slidably sleeved outside the inner tube. The inner tube has several flow-guiding ribs fixedly installed at equal angles around its interior. A reverse flow-guiding cone is fixedly installed at the ends of the several flow-guiding ribs away from the valve body connecting plate. Drive opening and closing components are provided on both sides of the sleeve gate. A third sealing ring is fixedly installed at the end of the sleeve gate near the valve body connecting plate. Several through-holes are formed at equal angles around the edges of the third sealing ring and the sleeve gate. Self-lubricating components are provided inside the several positioning holes. Several mounting holes are formed at equal angles around the edges of the valve body connecting plate.
[0006] Furthermore, a second sealing ring is fixedly installed at one end of the sleeve gate near the reverse flow guide cone, and a first sealing ring is fixedly installed on the outside of the reverse flow guide cone near the second sealing ring, with the first sealing ring and the second sealing ring abutting and sealing against each other.
[0007] Furthermore, the drive opening and closing assembly includes a hydraulic relay and a fixing plate. The hydraulic relay is disposed between the valve body connecting plate and the second sealing ring. The fixing plate is fixedly installed on the outside of the second sealing ring. The output end of the hydraulic relay passes through the fixing plate and is fixedly connected to it.
[0008] Furthermore, a mounting plate is fixedly installed on the side of the valve body connecting plate near the hydraulic relay, and the end of the hydraulic relay away from the fixed plate is fixedly installed on the outside of the mounting plate by bolts.
[0009] Furthermore, a corrugated sleeve is fitted around the inner tube between the valve body connecting plate and the third sealing ring. The corrugated sleeve completely covers the outer sliding surface of the inner tube. One end of the corrugated sleeve is fixedly installed on one edge of the valve body connecting plate, and the other end of the corrugated sleeve is fixedly installed on one side edge of the third sealing ring. An annular main liquid pipe is fitted around the end of the sleeve gate near the second sealing ring.
[0010] Furthermore, a connecting flange is fixedly installed at the input end of the annular main liquid pipe, and several fixing brackets are fixedly installed through the annular main liquid pipe at equal intervals. One end of each fixing bracket is embedded and fixedly installed on the outside of the sleeve gate. A diversion inlet pipe is fixedly connected to the inside of the annular main liquid pipe near each positioning hole.
[0011] Furthermore, the self-lubricating assembly includes a piston block and two symmetrically arranged limiting rods. The piston block is slidably and sealed inside the positioning hole, and one end of each of the two symmetrically arranged limiting rods is fixedly installed on the outside of the piston block on the side away from the diversion inlet pipe.
[0012] Furthermore, the ends of the two limiting rods away from the piston block are fixedly installed on the outside of the valve body connecting plate. The end of the diversion inlet pipe away from the annular main liquid pipe passes through and is sealed and fixed inside the positioning hole. The inside of the diversion inlet pipe is fixedly connected to an inlet check valve. The middle of the piston block is fixedly connected to a flexible stretching drain pipe.
[0013] Furthermore, the flexible stretchable drain pipe is fixedly connected to the inside of the piston block with a drain one-way valve, and the end of the flexible stretchable drain pipe away from the piston block is fixedly connected to a spray head. The output end of the spray head faces the outside of the inner tube, and a positioning frame is fixedly installed on the outside of the spray head. One end of the positioning frame is fixedly installed on the outside of the third sealing ring.
[0014] Furthermore, two limiting plates are symmetrically fixedly installed on the outside of the valve body connecting plate. Guide frames are fixedly installed on the outside of both limiting plates near the sleeve gate. Limiting sliders are slidably engaged on the outside of the guide frames. One end of the limiting slider is fixedly installed on the outside of the third sealing ring. Inclined shovel blocks are installed on both sides of the limiting slider near the guide frames. One side of the inclined shovel block abuts against the outer surface of the corresponding side of the guide frame. Positioning bolts are threaded between the inclined shovel block and the limiting slider.
[0015] The technical solution of this invention has the following advantages: 1. By incorporating an inner cylinder, a sleeve gate, guide ribs, a reverse guide cone, a corrugated sleeve, a drive opening and closing assembly, and a self-lubricating assembly, this fixed cone pressure relief valve overcomes the inherent defects of traditional gate-type pressure relief valves, achieving complete hydraulic balance, significantly reducing drive torque, improving opening and closing response speed, achieving efficient self-energy dissipation, and avoiding cavitation damage caused by high-speed local jets. The corrugated sleeve fully encloses the outer sliding surface of the inner cylinder, completely isolating impurities such as mud, sand, and scale, while forming an independent sealed cavity to prevent the lubricating grease from being diluted and washed away by the water flow. The self-lubricating assembly automatically completes quantitative grease injection with the valve opening and closing, forming a uniform oil film on the surface of the inner cylinder, eliminating the need for manual shutdown maintenance and alleviating sliding jamming problems.
[0016] 2. Through the design of an external continuous oil supply structure, a limit-guided self-cleaning structure, and an inclined surface line contact sealing structure, this fixed cone pressure relief valve can achieve long-term stable and reliable operation. The connection flange allows for external grease storage tank replenishment without disassembling the valve body, ensuring grease cleanliness and preventing pipeline blockage. The precise fit between the limit slider and the guide frame strictly limits the radial displacement of the sleeve gate, preventing uneven loading and tilting. The inclined shovel block removes impurities from the guide frame surface, ensuring smooth sliding. The first and second sealing rings form an inclined surface line contact seal, achieving zero leakage even in the fully closed state. The third sealing ring further enhances the overall sealing performance, significantly extending the valve's service life.
[0017] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description
[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural diagram of the valve body connecting disc and the flow guide rib of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 For the present invention Figure 2 Enlarged structural diagram at point B; Figure 5 This is a partial cross-sectional three-dimensional structural schematic diagram of the inner cylinder and sleeve gate of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point C; Figure 7 This is a partial cross-sectional three-dimensional structural schematic diagram of the sleeve gate and the corrugated sleeve of the present invention; Figure 8 For the present invention Figure 7 Enlarged structural diagram at point D; Figure 9 This is a partial cross-sectional three-dimensional structural schematic diagram of the third sealing ring and the corrugated sleeve of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point E; Figure 11 This is a three-dimensional structural diagram of the flexible stretchable drain pipe and drain one-way valve of the present invention.
[0020] Explanation of reference numerals in the attached figures: 1. Valve body connecting plate; 2. Inner cylinder tube; 3. Sleeve gate; 4. Guide rib; 5. Reverse guide cone; 6. First sealing ring; 7. Second sealing ring; 8. Hydraulic relay; 9. Fixing plate; 10. Guide frame; 11. Third sealing ring; 12. Limiting slider; 13. Inclined shovel block; 14. Corrugated sleeve; 15. Annular main liquid pipe; 16. Fixing frame; 17. Connecting flange; 18. Positioning hole; 19. Diverting liquid inlet pipe; 20. Piston block; 21. Flexible tensile drain pipe; 22. Limiting rod; 23. Spray head; 24. Inlet check valve; 25. Drain check valve; 26. Mounting plate; 27. Positioning bolt; 28. Limiting plate; 29. Mounting hole; 30. Positioning frame. Detailed Implementation
[0021] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.
[0022] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.
[0023] Please see Figures 1 to 11 As shown, the present invention provides a fixed conical pressure relief valve, including a valve body connecting plate 1, an inner tube 2 coaxially fixedly installed at one end of the valve body connecting plate 1, and a sleeve gate 3 slidably sleeved outside the inner tube 2. Several flow guide ribs 4 are fixedly installed at equal angles around the inside of the inner tube 2. A reverse flow guide cone 5 is fixedly installed at the end of the several flow guide ribs 4 away from the valve body connecting plate 1. Both sides of the sleeve gate 3 are provided with drive opening and closing components. A third sealing ring 11 is fixedly installed at the end of the sleeve gate 3 near the valve body connecting plate 1. Several through positioning holes 18 are opened at equal angles around the edge of the third sealing ring 11 and the sleeve gate 3. A self-lubricating component is provided inside the several positioning holes 18. Several mounting holes 29 are opened at equal angles around the edge of the valve body connecting plate 1.
[0024] A second sealing ring 7 is fixedly installed at one end of the sleeve gate 3 near the reverse flow guide cone 5, and a first sealing ring 6 is fixedly installed on the outside of the reverse flow guide cone 5 near the second sealing ring 7. The first sealing ring 6 and the second sealing ring 7 abut and fit together to seal.
[0025] The drive opening and closing assembly includes a hydraulic servo 8 and a fixing plate 9. The hydraulic servo 8 is disposed between the valve body connecting plate 1 and the second sealing ring 7. The fixing plate 9 is fixedly installed on the outside of the second sealing ring 7. The output end of the hydraulic servo 8 passes through the fixing plate 9 and is fixedly connected to it.
[0026] A mounting plate 26 is fixedly installed on the side of the valve body connecting plate 1 near the hydraulic relay 8. The end of the hydraulic relay 8 away from the fixed plate 9 is fixedly installed on the outside of the mounting plate 26 by bolts.
[0027] A corrugated sleeve 14 is fitted around the inner tube 2 between the valve body connecting plate 1 and the third sealing ring 11. The corrugated sleeve 14 completely covers the outer sliding surface of the inner tube 2. One end of the corrugated sleeve 14 is fixedly installed on one edge of the valve body connecting plate 1, and the other end of the corrugated sleeve 14 is fixedly installed on one side edge of the third sealing ring 11. An annular main liquid pipe 15 is fitted around the end of the sleeve gate 3 near the second sealing ring 7.
[0028] A connecting flange 17 is fixedly installed at the input end of the annular main liquid pipe 15. Several fixing brackets 16 are fixedly installed through the annular main liquid pipe 15 at equal intervals. One end of each fixing bracket 16 is embedded and fixedly installed on the outside of the sleeve gate 3. A diversion inlet pipe 19 is fixedly connected to the inside of the annular main liquid pipe 15 on the side near each positioning hole 18.
[0029] The self-lubricating assembly includes a piston block 20 and two symmetrically arranged limiting rods 22. The piston block 20 is slidably sealed inside the positioning hole 18, and one end of each of the two symmetrically arranged limiting rods 22 is fixedly installed on the outside of the piston block 20 on the side away from the diversion inlet pipe 19.
[0030] The ends of the two limiting rods 22 away from the piston block 20 are fixedly installed on the outside of the valve body connecting plate 1. The end of the diversion inlet pipe 19 away from the annular main liquid pipe 15 passes through and is sealed and fixed inside one side of the positioning hole 18. The inside of the diversion inlet pipe 19 is fixedly connected to the inlet check valve 24. The middle of the piston block 20 is fixedly connected to the flexible stretching drain pipe 21.
[0031] The flexible stretchable drain pipe 21 is fixedly connected to the inside of the piston block 20 with a drain one-way valve 25. The end of the flexible stretchable drain pipe 21 away from the piston block 20 is fixedly connected to a spray head 23. The output end of the spray head 23 faces the outside of the inner tube 2. A positioning frame 30 is fixedly installed on the outside of the spray head 23. One end of the positioning frame 30 is fixedly installed on the outside of the third sealing ring 11.
[0032] Two limiting plates 28 are symmetrically fixedly installed on the outside of the valve body connecting plate 1. Guide frames 10 are fixedly installed on the outside of the two limiting plates 28 near the sleeve gate 3. Limiting sliders 12 are slidably engaged on the outside of the guide frames 10. One end of the limiting slider 12 is fixedly installed on the outside of the third sealing ring 11. Inclined shovel blocks 13 are installed on both sides of the limiting slider 12 near the guide frames 10. One side of the inclined shovel block 13 abuts against the outer surface of the corresponding side of the guide frame 10. A positioning bolt 27 is threaded between the inclined shovel block 13 and the limiting slider 12.
[0033] Working principle: During operation, the pressure relief valve is first connected to the upstream water intake pipe via the mounting holes 29 on the edge of the valve body connecting plate 1 using mating flange bolts, allowing high-pressure water to enter the inner cylinder 2. Under normal power generation conditions, the valve remains fully closed, and the hydraulic servo 8 is extended, moving the sleeve gate 3 to its downstream limit position. The first sealing ring 6, fixed to the outside of the reverse flow cone 5, and the second sealing ring 7, fixed to the end of the sleeve gate 3, tightly abut against each other, forming an inclined surface line contact sealing structure. This achieves zero leakage at the drip level in the fully closed state, completely eliminating high-pressure water seepage and ensuring normal unit operation.
[0034] When the unit experiences abnormal shutdown conditions such as load shedding and requires pressure relief, the control system sends a valve opening command to the hydraulic servo 8 (the two hydraulic servo 8 are controlled by synchronous valves to ensure synchronization accuracy of no less than ±1mm to prevent uneven loading of the sleeve gate 3). The two radially symmetrically arranged hydraulic servo 8 retract synchronously, driving the sleeve gate 3 to slide smoothly upstream along the outer surface of the inner cylinder 2 via the fixing plate 9. As the sleeve gate 3 gradually retracts upstream, the reverse flow guide cone 5, which was originally completely enclosed by the sleeve gate 3, is gradually exposed, forming an annular flow section between the inner cylinder 2 and the reverse flow guide cone 5. High-pressure water flows out evenly through this annular section, and under the guidance of the reverse flow guide cone 5, forms a hollow expanding annular water tongue that sprays downstream into the river channel. It fundamentally overcomes the shortcomings of traditional gate-type pressure relief valves, such as concentrated water flow and poor energy dissipation effect. The water flow achieves efficient self-energy dissipation through full friction and mixing with air, eliminating the need for additional downstream energy dissipation facilities. At the same time, it avoids severe cavitation damage caused by high-speed local jets, significantly extending the service life of the valve. The reverse guide cone 5 has a cone angle of 60°-90° and a streamlined surface design, ensuring that the water flow forms a uniform hollow expanding annular water tongue, achieving efficient self-energy dissipation.
[0035] Simultaneously, the connecting flange 17 at the input end of the annular main fluid pipe 15 is sealed and connected to an externally independent grease storage tank via a high-pressure oil-resistant hose. The external storage tank is pre-filled with water-resistant extreme-pressure grease suitable for high-pressure water environments, providing a continuous and stable grease supply for the self-lubricating system. This external oil supply design allows for grease replenishment without disassembling the valve body, significantly reducing maintenance difficulty. Furthermore, the sealing surfaces of the first sealing ring 6 and the second sealing ring 7 have an inclination angle of 30°-45° and a surface roughness not exceeding Ra0.8μm, ensuring line contact sealing pressure under fully closed conditions. The third sealing ring 11 is a dynamic sealing ring, with its inner surface slidingly sealing against the outer surface of the inner cylinder 2. It is made of polytetrafluoroethylene filled with copper powder, exhibiting excellent self-lubrication and wear resistance.
[0036] The inlet check valve 24 flows from the annular main liquid pipe 15 to the inside of the positioning hole 18, and the outlet check valve 25 flows from the inside of the positioning hole 18 to the spray head 23. The flexible stretching outlet pipe 21 is made of oil-resistant and fatigue-resistant fluororubber or stainless steel bellows material, and can be replaced by disassembling the third sealing ring 11. Meanwhile, the bellows sleeve 14 is made of 316L stainless steel, and its two ends are welded to the valve body connecting plate 1 and the third sealing ring 11 respectively to ensure that the sealing cavity is completely isolated from the external water flow. At the same time, the maximum extension stroke of the bellows sleeve 14 is 10%-15% larger than the maximum opening and closing stroke of the sleeve gate 3, leaving a safety margin.
[0037] As the sleeve gate 3 moves upstream to open, the self-lubricating component simultaneously activates to complete the automatic quantitative grease injection. Since one end of each of the two limit rods 22 is fixed to the valve body connecting plate 1 and remains stationary, when the sleeve gate 3 moves upstream, it causes the piston block 20 inside the positioning hole 18 to slide downstream relative to the sleeve gate 3, squeezing the pre-stored lubricating grease within the positioning hole 18. The high-pressure grease is then transported to the spray head 23 through the flexible stretching drain pipe 21, and evenly sprayed onto the entire outer sliding surface of the inner cylinder 2 by the evenly distributed spray heads 23, forming a continuous and uniform lubricating oil film. This significantly reduces the sliding friction resistance between the sleeve gate 3 and the inner cylinder 2, fundamentally preventing jamming. This purely mechanical self-lubricating component requires no external power source, sensor, or manual intervention. It automatically completes a quantitative grease injection each time the valve is opened, completely solving the industry pain points of traditional pressure relief valves that rely on manual periodic shutdowns for grease injection, resulting in high maintenance costs and the grease being easily washed away by high-pressure water.
[0038] Simultaneously, the corrugated sleeve 14, fitted outside the inner cylinder 2, retracts and folds synchronously with the movement of the sleeve gate 3. Its two ends are fixed to the valve body connecting plate 1 and the third sealing ring 11, respectively, completely enveloping the outer sliding surface of the inner cylinder 2, forming an independent sealed cavity completely isolated from the external high-pressure sand-laden water flow. This sealed cavity not only completely prevents impurities such as mud, scale, and aquatic debris in the water from contacting the sliding surface of the inner cylinder 2, eliminating the jamming problem caused by impurity deposition at its source, but also completely seals the lubricating grease sprayed by the self-lubricating component within the sealed cavity, preventing the grease from being diluted and washed away by the high-pressure water flow. This extends the effective maintenance time of the lubricating oil film from the traditional several hours to several months, significantly improving grease utilization. Furthermore, the evenly distributed multiple sets of limiting rods 22 simultaneously provide radial limiting for the retracting and folding corrugated sleeve 14, preventing it from concave inwards and contacting the outer wall of the inner cylinder 2 during folding, thus avoiding jamming friction between the corrugated sleeve 14 and the inner cylinder 2, further improving the reliability of valve operation.
[0039] During the entire process of opening and closing the sleeve gate 3, the limiting slider 12 fixed on the third sealing ring 11 slides synchronously along the guide frame 10. Through the precise cooperation between the guide frame 10 and the limiting slider 12, the radial displacement of the sleeve gate 3 is strictly limited, preventing the sleeve gate 3 from tilting under the action of high-speed water flow, ensuring that the sleeve gate 3 always moves smoothly along the axial direction, and completely solving the defect of traditional gate-type pressure relief valves that are prone to vibration and tilting. Meanwhile, the inclined shovel blocks 13 installed on both sides of the limit slider 12 move synchronously with the limit slider 12. The inclined cutting edge of the inclined shovel block 13 is always in close contact with the outer surface of the guide frame 10, forming a limit guide self-cleaning structure. It can automatically remove mud, scale and other debris attached to the surface of the guide frame 10, ensuring that the sliding of the limit slider 12 on the guide frame 10 is always smooth and unobstructed, without the need for manual regular cleaning and maintenance. At the same time, the inclined shovel block 13 is made of wear-resistant alloy steel and is fixed by positioning bolts 27. It can be replaced separately after wear. The surface of the guide frame 10 is chrome-plated, with a hardness of not less than HRC55 and a maintenance cycle of not less than 2 years.
[0040] When the pipeline pressure drops to a safe range and the valve needs to be closed, the control system sends a valve-closing command to the hydraulic relays 8. The two hydraulic relays 8 extend synchronously, causing the sleeve gate 3 to slide smoothly downstream along the outer surface of the inner cylinder 2. As the sleeve gate 3 moves downstream, the piston block 20 slides upstream relative to the sleeve gate 3, creating a negative pressure inside the positioning hole 18. Lubricating grease is drawn into the positioning hole 18 through the annular main liquid pipe 15 and the branch inlet pipe 19, preparing for the grease injection action when the valve opens next. When the sleeve gate 3 moves to its downstream limit position, the first sealing ring 6 and the second sealing ring 7 tightly seal again, the valve returns to the fully closed state, and the corrugated sleeve 14 simultaneously extends completely, continuing to fully wrap and protect the outer sliding surface of the inner cylinder 2.
[0041] This invention forms a complete technical closed loop by organically combining the inner cylinder, sleeve gate, flow guide rib, reverse flow guide cone, corrugated sleeve, drive opening and closing assembly, and self-lubricating assembly. It completely solves a series of inherent defects of traditional gate-type pressure relief valves, such as large driving torque, slow opening and closing response, severe cavitation, poor energy dissipation effect, easy jamming and wear, and high operation and maintenance costs. It significantly improves the operational reliability and service life of pressure relief valves in hydropower stations and greatly reduces the operation and maintenance costs and safety risks of power stations.
[0042] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A fixed conical pressure relief valve, characterized in that, include: The device includes a valve body connecting plate (1), an inner tube (2) coaxially fixedly installed at one end of the valve body connecting plate (1), and a sleeve gate (3) slidably sleeved outside the inner tube (2). Several flow guide ribs (4) are fixedly installed around the inner tube (2) at equal angles. A reverse flow guide cone (5) is fixedly installed at the end of the several flow guide ribs (4) away from the valve body connecting plate (1). Both sides of the sleeve gate (3) are provided with drive opening and closing components. A third sealing ring (11) is fixedly installed at the end of the sleeve gate (3) near the valve body connecting plate (1). Several through positioning holes (18) are opened around the inner edge of the third sealing ring (11) and the sleeve gate (3) at equal angles. A self-lubricating component is provided inside the several positioning holes (18). Several mounting holes (29) are opened around the inner edge of the valve body connecting plate (1) at equal angles.
2. The fixed conical pressure relief valve according to claim 1, characterized in that: The sleeve gate (3) is fixedly installed with a second sealing ring (7) at one end near the reverse flow cone (5), and a first sealing ring (6) is fixedly installed on the outside of the reverse flow cone (5) near the second sealing ring (7). The first sealing ring (6) and the second sealing ring (7) abut and fit together to seal.
3. A fixed conical pressure relief valve according to claim 2, characterized in that: The drive opening and closing assembly includes a hydraulic relay (8) and a fixing plate (9). The hydraulic relay (8) is disposed between the valve body connecting plate (1) and the second sealing ring (7). The fixing plate (9) is fixedly installed outside the second sealing ring (7). The output end of the hydraulic relay (8) passes through the fixing plate (9) and is fixedly connected to it.
4. A fixed conical pressure relief valve according to claim 3, characterized in that: The valve body connecting plate (1) is fixedly mounted on the side of the hydraulic relay (8) with an mounting plate (26) on the outside. The end of the hydraulic relay (8) away from the fixed plate (9) is fixedly mounted on the outside of the mounting plate (26) by bolts.
5. A fixed conical pressure relief valve according to any one of claims 2-4, characterized in that: The inner tube (2) is fitted with a corrugated sleeve (14) between the valve body connecting plate (1) and the third sealing ring (11). The corrugated sleeve (14) completely covers the outer sliding surface of the inner tube (2). One end of the corrugated sleeve (14) is fixedly installed on one end edge of the valve body connecting plate (1), and the other end of the corrugated sleeve (14) is fixedly installed on one side edge of the third sealing ring (11). The sleeve gate (3) is fitted with an annular main liquid pipe (15) on the outside of one end near the second sealing ring (7).
6. A fixed conical pressure relief valve according to claim 5, characterized in that: A connecting flange (17) is fixedly installed at the input end of the annular main liquid pipe (15). Several fixing brackets (16) are fixedly installed through the annular main liquid pipe (15) at equal intervals. One end of each fixing bracket (16) is embedded and fixedly installed on the outside of the sleeve gate (3). A diversion inlet pipe (19) is fixedly connected to the inside of the annular main liquid pipe (15) near each positioning hole (18).
7. A fixed conical pressure relief valve according to claim 6, characterized in that: The self-lubricating assembly includes a piston block (20) and two symmetrically arranged limiting rods (22). The piston block (20) is slidably and sealed inside the positioning hole (18). One end of each of the two symmetrically arranged limiting rods (22) is fixedly installed on the outside of the piston block (20) away from the diversion inlet pipe (19).
8. A fixed conical pressure relief valve according to claim 7, characterized in that: The ends of the two limiting rods (22) away from the piston block (20) are fixedly installed on the outside of the valve body connecting plate (1). The end of the diversion inlet pipe (19) away from the annular main liquid pipe (15) passes through and is sealed and fixed inside one side of the positioning hole (18). The inside of the diversion inlet pipe (19) is fixedly connected to the inlet one-way valve (24). The middle part of the piston block (20) is fixedly connected to the flexible stretching drain pipe (21).
9. A fixed conical pressure relief valve according to claim 8, characterized in that: The flexible stretchable drain pipe (21) is fixedly connected to the interior of the piston block (20) with a drain one-way valve (25). The end of the flexible stretchable drain pipe (21) away from the piston block (20) is fixedly connected to a spray head (23). The output end of the spray head (23) faces the outside of the inner tube (2). A positioning frame (30) is fixedly installed on the outside of the spray head (23). One end of the positioning frame (30) is fixedly installed on the outside of the third sealing ring (11).
10. A fixed conical pressure relief valve according to claim 1, characterized in that: Two limiting plates (28) are symmetrically fixedly installed on the outside of the valve body connecting plate (1). Guide frames (10) are fixedly installed on the outside of the two limiting plates (28) near the sleeve gate (3). Limiting sliders (12) are slidably engaged on the outside of the guide frames (10). One end of the limiting sliders (12) is fixedly installed on the outside of the third sealing ring (11). Inclined shovels (13) are installed on both sides of the limiting sliders (12) near the guide frames (10). One side of the inclined shovels (13) abuts against the outer surface of the corresponding side of the guide frames (10). A positioning bolt (27) is threaded between the inclined shovels (13) and the limiting sliders (12).