A control valve with pressure buffer function

Abstract

This invention discloses a control valve with pressure buffering function, relating to the field of control valve technology. The control valve includes a valve body structure, a valve core structure, a valve stem, an upper valve cover structure, a bracket, and an electric actuator. The valve body structure ensures normal and efficient water flow when the control valve is open, and causes some fluid to flow in reverse when the control valve is closed, reducing the force transmitted to the valve core by fluid impact. The valve core structure adopts a spiral groove and pressure-reducing structure, which allows the energy of the fluid to be converted and attenuated to a greater extent, minimizing the mechanical stress and wear on the valve core, and ensuring that the valve can maintain precise control and safe and reliable operation under extreme conditions. The upper valve cover structure can not only dissipate energy by converting small-amplitude vibrations into heat during normal operation, but also provides an effective self-correction function when encountering sudden impacts, ensuring long-term accurate positioning and stable operation of the valve stem.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, specifically a control valve with an added pressure buffer function. Background Technology

[0002] Control valves are a general term for valves that control the direction, pressure, or flow rate of a medium. They are control components in fluid transport systems and have functions such as shut-off regulation, flow guidance, backflow prevention, flow diversion, or overflow pressure relief. With the vigorous development of my country's industrial economy, especially the continuous expansion and upgrading of key fields such as natural gas, petrochemicals, power, and coal chemicals, the market demand for control valves is growing at an unprecedented rate. These industries have put forward diversified and high-standard requirements for control valves, from high temperature resistance, corrosion resistance, and wear resistance to precise control and rapid response. Each indicator drives the continuous innovation and breakthroughs in control valve technology.

[0003] Existing technology has defects: During long-term use, the control valve will be subjected to external forces such as fluid impact, vibration and pressure fluctuation. These forces will cause the valve internals to shift, and at the same time reduce its control accuracy, affecting the stability and reliability of the entire fluid control system. Summary of the Invention

[0004] The purpose of this invention is to provide a control valve with a pressure buffer function to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: the control valve includes a valve body structure, an upper valve cover structure is installed on one side of the valve body structure, a bracket is installed on one side of the upper valve cover structure, an electric actuator is installed on one side of the bracket, a valve stem is installed at the output end of the electric actuator, a valve core structure is installed at one end of the valve stem, the valve stem slides within the upper valve cover structure, the valve core structure slides within the valve body structure, and the electric actuator is connected to the control system.

[0006] The valve body structure includes a valve body with an inlet chamber and an outlet chamber inside. A valve cage is installed in the outlet chamber, and the valve core structure slides within the valve cage. A buffer plunger structure is installed inside the valve cage, with one end connected to one end of the inlet chamber and the other end connected to one end of the outlet chamber. The buffer plunger structure is located below the valve core structure. When the control valve is open, fluid flows from the inlet chamber through the buffer plunger structure to the outlet chamber. When the control valve is closed, the control system activates the electric actuator, which drives the valve stem to slide towards the valve body within the upper valve cover. The valve stem, in turn, drives the valve core structure to slide towards the valve body within the valve cage.

[0007] The buffer plunger structure includes a plunger installed inside the valve cage, located below the valve core structure. The plunger's interior contains a buffer groove, an acceleration groove, and a mounting groove. One end of the buffer groove and acceleration groove is connected to one end of the inlet chamber, and the other end is connected to one end of the outlet chamber. A first rotating shaft is installed in the mounting groove, and a limit groove is provided within the first rotating shaft. A conversion plate is installed at one end of the first rotating shaft, and a conversion hole is provided within the conversion plate. The size of the conversion hole is larger than the inlet size of the buffer groove, and the inlet sizes of the buffer groove and acceleration groove are the same. When the control valve is opened, the conversion hole of the conversion plate communicates with the acceleration groove, and fluid flows from the inlet chamber into the acceleration groove and accelerates to the outlet chamber.

[0008] The buffer tank includes a first inlet section, one end of which is connected to one end of the inlet chamber. The conversion plate is installed inside the first inlet section. The other end of the first inlet section is connected to a first buffer section, and the other end of the first buffer section is connected to a first diversion section. One end of the first diversion section is connected to the first inlet section, and the other end of the first diversion section is connected to a second buffer section. The other end of the second buffer section is connected to a first outlet section, one end of which is connected to the first diversion section, and the other end of the first outlet section is connected to one end of the outlet chamber. When fluid enters from the first inlet section, part of the fluid enters the first diversion section, and the other part enters the first buffer section. The fluid entering the first buffer section will impact the fluid in the first diversion section, reducing the fluid's kinetic energy. Part of the fluid in the first diversion section enters the second buffer section, and the other part enters the first outlet section. The fluid entering the second buffer section will impact the fluid in the first outlet section, further reducing the fluid's kinetic energy.

[0009] The acceleration tank includes a second inlet section, one end of which is connected to one end of the inlet chamber. The conversion plate is installed inside the second inlet section. A first acceleration section is connected to the second inlet section. One end of the first acceleration section is connected to a second diversion section. The other end of the second inlet section is connected to the second diversion section. A second acceleration section is connected to the second diversion section. One end of the second acceleration section is connected to a second outlet section. One end of the second diversion section is connected to the second outlet section. The other end of the second outlet section is connected to one end of the outlet chamber. When fluid enters from the second inlet section, part of the fluid enters the second diversion section, and the other part enters the first acceleration section. The fluid entering the first acceleration section merges with the fluid in the second diversion section, increasing the fluid velocity. Part of the fluid in the second diversion section enters the second acceleration section, and the other part enters the second outlet section. The fluid entering the second acceleration section merges with the fluid in the second outlet section, further increasing the fluid velocity. When fluid enters from the second outlet section, part of the fluid enters the second diversion section, and the other part enters the second acceleration section. The fluid entering the second acceleration section impacts the fluid in the second diversion section, reducing the fluid's kinetic energy. Part of the fluid in the second diversion section enters the first acceleration section, and the other part enters the second inlet section. The fluid entering the first acceleration section impacts the fluid in the second inlet section, further reducing the fluid's kinetic energy.

[0010] The valve core structure includes a valve core that slides within a valve cage and is located above a plunger. One end of the valve stem is mounted on the valve core. An O-ring is installed on the valve core. The valve core contains a first spiral groove, a second spiral groove, and a recess. The first spiral groove communicates with a first water outlet section, and the second spiral groove communicates with a second water outlet section. A pressure-reducing structure is installed in the recess. The other ends of the first and second spiral grooves are connected to the pressure-reducing structure. A rotating block is installed at one end of the pressure-reducing structure, and a limiting block is installed on the rotating block. The limiting block matches the limiting groove.

[0011] The pressure-relieving structure includes an arc-shaped groove disposed within the valve core. A sealing groove is provided between the arc-shaped groove and the recess. A sealing ring is rotatably connected within the sealing groove. A first rolling ball and a second rolling ball are installed within the arc-shaped groove. A first connecting plate is mounted on the first rolling ball. A semi-circular block is installed between the first and second rolling balls, and the semi-circular block slides within the arc-shaped groove. A rotating plate is mounted at one end of the first connecting plate. A second connecting plate is mounted on the second rolling ball, and the other end of the second connecting plate is mounted on the rotating plate. A connecting column is mounted at one end of the rotating plate, and the other end of the connecting column is installed within the rotating block. A water inlet groove and a water outlet groove are provided on one side of the arc-shaped groove. The water inlet groove is located at one end of the arc-shaped groove and communicates with a first spiral groove. The water outlet groove communicates with a second spiral groove. An arc-shaped spring is mounted on the second rolling ball, and the other end of the arc-shaped spring is mounted at the other end of the arc-shaped groove. When the control valve is closed, the valve core moves towards the plunger, and the fluid flows in the first spiral groove. Kinetic energy is reduced by the first and second spiral grooves. One end of the second spiral groove is blocked by a semi-circular block. When the limiting block enters the limiting groove, the fluid flows from the first spiral groove through the inlet groove into the arc-shaped groove, pushing the first rolling ball to move in the arc-shaped groove. The first rolling ball drives the first connecting plate and the semi-circular block to move. The first connecting plate drives the rotating plate to rotate. The rotating plate drives the connecting column and the second connecting plate to move. The connecting column drives the limiting block to move. The limiting block drives the first rotating shaft to rotate. The switching plate rotates, the buffer groove connects with the switching plate, the acceleration groove is blocked by the switching plate, the second connecting plate drives the second rolling ball to move, the second rolling ball drives the arc spring to compress, the fluid's kinetic energy is consumed by the buffer groove, when the fluid pressure is too high, the fluid pushes the first rolling ball all the way to the outlet groove, the fluid enters the second spiral groove from the outlet groove to reduce kinetic energy, a small part of the high pressure fluid enters the second outlet section, finally reducing all kinetic energy, minimizing the mechanical stress and wear on the valve core, ensuring that the valve can maintain precise control and safe and reliable operation under extreme conditions.

[0012] The upper valve cover structure includes an upper valve cover, which is installed on one side of the valve body. The valve stem slides inside the upper valve cover. A packing pad is installed inside the upper valve cover. Packing is provided on one side of the packing pad. A packing pressure sleeve is installed on one side of the packing. A vibration damping structure is installed inside the upper valve cover. The valve stem slides within the vibration damping structure.

[0013] The vibration damping structure includes a fixed block and a movable block. The fixed block is installed inside the upper valve cover, and the valve stem slides within the movable block. A sliding groove is provided inside the fixed block, and a friction damper is installed within the sliding groove. A slider is slidably connected within the friction damper. A contact block is installed at one end of the slider, and an arc-shaped plate is installed at one end of the contact block. A vibration damping pad is provided on the surface of the arc-shaped plate and rests against the valve stem. A vibration damping spring is installed at the other end of the slider, and one end of the vibration damping spring is installed at one end of the sliding groove. A rack is installed on one side of the slider, and a support plate is installed on one side of the fixed block. A second rotating shaft is rotatably connected within the support plate, and a gear is installed at one end of the second rotating shaft. The gear meshes with the rack. A first connecting rod is installed at the other end of the second rotating shaft, and a second connecting rod is rotatably connected to one end of the first connecting rod. One end of the second connecting rod rotates on the movable block. When the valve stem is impacted and moves radially, it pushes the damping pad to move away from the valve stem. The damping pad moves the arc plate, which in turn moves the slider in the friction damper. The slider causes the damping spring to contract, which in turn moves the rack, which in turn rotates the gear, which in turn rotates the second shaft, which in turn rotates the first connecting rod, which in turn rotates the second connecting rod, which in turn moves the movable block. The movable block exerts a reverse force on the valve stem, and the valve stem returns to its initial position under the combined action of the reverse force and the elastic force of the damping spring, ensuring the accuracy and reliability of the entire control system.

[0014] A first metal gasket is installed on one side of the valve cage, and a second metal gasket is installed on one side of the upper valve cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. When the control valve is open, the fluid passes through the acceleration groove in the plunger of the present invention, so that the fluid obtains an appropriate acceleration effect, thereby maintaining a high and stable flow rate. The acceleration groove does not obstruct the water flow, ensuring that the fluid can smoothly enter the outlet chamber. When the control valve is closed, the fluid passes through the buffer groove in the plunger, and part of the fluid flows in reverse, forming a backflow effect, which makes the fluid encounter great resistance when flowing, reducing the force of fluid impact transmitted to the valve core. This not only ensures the efficient delivery of water flow under normal operating conditions, but also improves the durability and control accuracy of key internal components of the valve.

[0017] 2. The valve core structure of the present invention adopts a spiral groove and a pressure-reducing structure. After the fluid passes through the buffer plunger structure, the impact energy of the fluid is dispersed and absorbed in multiple stages to form a secondary pressure reduction, which further alleviates the impact force of the fluid. When the pressure is too high, the fluid can be introduced into the buffer plunger structure to form a tertiary pressure reduction, so that the energy of the fluid can be converted and attenuated to a greater extent, minimizing the mechanical stress and wear on the valve core, and ensuring that the valve can maintain precise control and safe and reliable operation under extreme working conditions.

[0018] 3. The vibration damping structure of the present invention can quickly convert the small-amplitude vibrations of the valve stem caused by fluid impact, vibration or external disturbance during operation into heat energy and disperse it into the surrounding environment through the energy conversion mechanism of internal friction and elastic materials. This not only reduces the vibration amplitude of the valve stem itself, but also prevents the decrease in accuracy or wear of components caused by long-term accumulation of micro-vibrations. When the valve stem is subjected to a large impact and its position is significantly offset, the vibration damping structure can automatically generate a reverse force to offset the offset and make the valve stem automatically return to its initial working position, thereby ensuring the accuracy and reliability of the entire control system. Attached Figure Description

[0019] Figure 1 This is a partial cross-sectional view of the control valve of the present invention;

[0020] Figure 2 This is an exploded view of the buffer plunger structure of the present invention;

[0021] Figure 3 for Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 4 This is an exploded view of the valve core structure of the present invention;

[0023] Figure 5 for Figure 1 A magnified view of a portion of region B in the middle;

[0024] Figure 6 This is a perspective view of the vibration reduction structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the internal structure of the vibration reduction structure of the present invention.

[0026] In the diagram: 1. Valve body structure; 11. Valve body; 12. Inlet chamber; 13. Outlet chamber; 14. Valve cage; 15. Buffer plunger structure; 151. Plunger; 152. First rotating shaft; 153. Conversion plate; 154. Buffer groove; 1541. First inlet section; 1542. First buffer section; 1543. First diversion section; 1544. Second buffer section; 1545. First outlet section; 155. Acceleration groove; 1551. Second inlet section; 1552. First acceleration section; 1553. Second diversion section; 1554. Second acceleration section; 1555. Second outlet section; 2. Valve core structure; 21. Valve core; 22. First spiral groove; 23. 24. Second spiral groove; 25. O-ring; 26. Pressure-relieving structure; 27. Arc groove; 28. Sealing ring; 29. ​​Rotating plate; 20. First rolling ball; 20. Second rolling ball; 21. Rotating block; 22. Limiting block; 23. Groove; 44. Valve stem; 55. Upper valve cover structure; 66. Upper valve cover; 77. Packing pad; 88. Packing; 9. Vibration damping structure; 10. Fixed block; 11. Moving block; 12. Second connecting rod; 13. First connecting rod; 14. Rack; 15. Gear; 16. Slider; 17. Friction damper; 18. Arc plate; 19. Packing sleeve; 20. Bracket; 20. Electric actuator. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example: Figures 1-7 As shown, the present invention provides a technical solution in which the control valve includes a valve body structure 1, an upper valve cover structure 4 is installed on one side of the valve body structure 1, a bracket 5 is installed on one side of the upper valve cover structure 4, an electric actuator 6 is installed on one side of the bracket 5, a valve stem 3 is installed at the output end of the electric actuator 6, a valve core structure 2 is installed at one end of the valve stem 3, the valve stem 3 slides in the upper valve cover structure 4, the valve core structure 2 slides in the valve body structure 1, and the electric actuator 6 is connected to the control system.

[0029] The valve body structure 1 includes a valve body 11, which has an inlet chamber 12 and an outlet chamber 13. A valve cage 14 is installed in the outlet chamber 13, and a first metal gasket is installed on one side of the valve cage 14. The valve core structure 2 slides within the valve cage 14. A buffer plunger structure 15 is installed inside the valve cage 14. One end of the buffer plunger structure 15 is connected to one end of the inlet chamber 12, and the other end is connected to one end of the outlet chamber 13. The buffer plunger structure 15 is located below the valve core structure 2. When the control valve is opened, fluid flows from the inlet chamber 12 through the buffer plunger structure 15 to the outlet chamber 13. When the control valve is closed, the control system controls the electric actuator 6 to start. The electric actuator 6 drives the valve stem 3 to slide closer to the valve body 11 within the upper valve cover 41. The valve stem 3 drives the valve core structure 2 to slide closer to the valve body 11 within the valve cage 14.

[0030] The buffer plunger structure 15 includes a plunger 151, which is installed inside the valve cage 14 and located below the valve core structure 2. The plunger 151 contains a buffer groove 154, an acceleration groove 155, and a mounting groove. One end of the buffer groove 154 and the acceleration groove 155 is connected to one end of the inlet chamber 12, and the other end is connected to one end of the outlet chamber 13. A first rotating shaft 152 is installed in the mounting groove, and a limit groove is provided inside the first rotating shaft 152. A conversion plate 153 is installed at one end of the first rotating shaft 152, and a conversion hole is provided inside the conversion plate 153. The size of the conversion hole is larger than the inlet size of the buffer groove 154, and the inlet sizes of the buffer groove 154 and the acceleration groove 155 are the same. When the control valve is opened, the conversion hole of the conversion plate 153 communicates with the acceleration groove 155, and the fluid flows from the inlet chamber 12 into the acceleration groove 155 and accelerates to the outlet chamber 13.

[0031] The buffer tank 154 includes a first inlet section 1541, one end of which is connected to one end of the inlet chamber 12. A conversion plate 153 is installed inside the first inlet section 1541. The other end of the first inlet section 1541 is connected to a first buffer section 1542. The other end of the first buffer section 1542 is connected to a first diversion section 1543. One end of the first diversion section 1543 is connected to the first inlet section 1541. The other end of the first diversion section 1543 is connected to a second buffer section 1544. The other end of the second buffer section 1544 is connected to a first outlet section 1545. One end of the first outlet section 1545 is connected to the first diversion section 1543. The other end of the first outlet section 1545 is connected to one end of the outlet chamber 13.

[0032] When the fluid enters from the first inlet section 1541, part of the fluid enters the first diversion section 1543, and the other part enters the first buffer section 1542. The fluid entering the first buffer section 1542 will impact the fluid in the first diversion section 1543 in the opposite direction, reducing the kinetic energy of the fluid. Part of the fluid in the first diversion section 1543 enters the second buffer section 1544, and the other part enters the first outlet section 1545. The fluid entering the second buffer section 1544 will impact the fluid in the first outlet section 1545 in the opposite direction, further reducing the kinetic energy of the fluid.

[0033] The acceleration tank 155 includes a second inlet section 1551, one end of which is connected to one end of the inlet chamber 12. A conversion plate 153 is installed inside the second inlet section 1551. A first acceleration section 1552 is connected to the second inlet section 1551. One end of the first acceleration section 1552 is connected to a second diversion section 1553. The other end of the second inlet section 1551 is connected to the second diversion section 1553. A second acceleration section 1554 is connected to the second diversion section 1553. One end of the second acceleration section 1554 is connected to a second outlet section 1555. One end of the second diversion section 1553 is connected to the second outlet section 1555. The other end of the second outlet section 1555 is connected to one end of the outlet chamber 13.

[0034] When fluid enters from the second inlet section 1551, a portion of the fluid enters the second diversion section 1553, and the other portion enters the first acceleration section 1552. The fluid entering the first acceleration section 1552 merges with the fluid in the second diversion section 1553, increasing the fluid velocity. A portion of the fluid in the second diversion section 1553 enters the second acceleration section 1554, and the other portion enters the second outlet section 1555. The fluid entering the second acceleration section 1554 merges with the fluid in the second outlet section 1555, further increasing the fluid velocity. When the fluid enters from the second outlet section 1555, part of the fluid enters the second diversion section 1553, and the other part enters the second acceleration section 1554. The fluid entering the second acceleration section 1554 will impact the fluid in the second diversion section 1553 in the opposite direction, reducing the fluid's kinetic energy. Part of the fluid in the second diversion section 1553 enters the first acceleration section 1552, and the other part enters the second inlet section 1551. The fluid entering the first acceleration section 1552 will impact the fluid in the second inlet section 1551 in the opposite direction, further reducing the fluid's kinetic energy.

[0035] The valve core structure 2 includes a valve core 21, which slides within the valve cage 14. The valve core 21 is located above the plunger 151. One end of the valve stem 3 is mounted on the valve core 21. An O-ring 24 is mounted on the valve core 21. The valve core 21 has a first spiral groove 22, a second spiral groove 23, and a groove 28. The first spiral groove 22 communicates with the first water outlet section 1545, and the second spiral groove 23 communicates with the second water outlet section 1555. A pressure-reducing structure 25 is installed in the groove 28. The other ends of the first spiral groove 22 and the second spiral groove 23 are connected to the pressure-reducing structure 25. A rotating block 26 is mounted on one end of the pressure-reducing structure 25. A limiting block 27 is mounted on the rotating block 26, and the limiting block 27 matches the limiting groove.

[0036] The pressure-relieving structure 25 includes an arc-shaped groove 251, which is disposed within the valve core 21. A sealing groove is provided between the arc-shaped groove 251 and the recess 28. A sealing ring 252 is rotatably connected within the sealing groove. A first rolling ball 254 and a second rolling ball 255 are installed within the arc-shaped groove 251. A first connecting plate is installed on the first rolling ball 254. A semi-circular block is installed between the first rolling ball 254 and the second rolling ball 255, and the semi-circular block slides within the arc-shaped groove 251. A rotating plate 253 is installed at one end of the first connecting plate. A second connecting plate is installed on the second rolling ball 255, and the other end of the second connecting plate is installed on the rotating plate 253. A connecting column is installed on one end of the rotating plate 253, and one end of the connecting column is installed in the rotating block 26. A water inlet groove and a water outlet groove are provided on one side of the arc groove 251. The water inlet groove is located at one end of the arc groove 251 and is connected to the first spiral groove 22. The water outlet groove is connected to the second spiral groove 23. An arc spring is installed on the second rolling ball 255, and the other end of the arc spring is installed on the other end of the arc groove 251.

[0037] When the control valve is closed, the valve core 21 moves towards the plunger 151, and the fluid flows in the first spiral groove 22. The kinetic energy is reduced by the first spiral groove 22 and the second spiral groove 23. One end of the second spiral groove 23 is blocked by a semi-circular block. When the limiting block 27 enters the limiting groove, the fluid flows from the first spiral groove 22 through the water inlet groove into the arc groove 251, pushing the first rolling ball 254 to move in the arc groove 251. The first rolling ball 254 drives the first connecting plate and the semi-circular block to move. The first connecting plate drives the rotating plate 253 to rotate. The rotating plate 253 drives the connecting column and the second connecting plate to move. The connecting column drives the limiting block 27 to move. The limiting block 27 drives the first rotating shaft 152 to rotate. A rotating shaft 152 drives the conversion plate 153 to rotate. The buffer groove 154 is connected to the conversion plate 153. The acceleration groove 155 is blocked by the conversion plate 153. The second connecting plate drives the second rolling ball 255 to move. The second rolling ball 255 drives the arc spring to compress. The fluid's kinetic energy is consumed by the buffer groove 154. When the fluid pressure is too high, the fluid pushes the first rolling ball 254 to the outlet groove. The fluid enters the second spiral groove 23 from the outlet groove to reduce kinetic energy. A small part of the high-pressure fluid enters the second outlet section 1555, and finally all kinetic energy is reduced. This minimizes the mechanical stress and wear on the valve core, ensuring that the valve can maintain precise control and safe and reliable operation under extreme conditions.

[0038] The upper valve cover structure 4 includes an upper valve cover 41, which is installed on one side of the valve body 11. The valve stem 3 slides inside the upper valve cover 41. A second metal gasket is installed on one side of the upper valve cover 41. A packing gasket 42 is installed inside the upper valve cover 41. A packing 43 is provided on one side of the packing gasket 42. A packing sleeve 45 is installed on one side of the packing 43. A vibration damping structure 44 is installed inside the upper valve cover 41. The valve stem 3 slides inside the vibration damping structure 44.

[0039] The vibration damping structure 44 includes a fixed block 441 and a movable block 442. The fixed block 441 is installed inside the upper valve cover 41, and the valve stem 3 slides within the movable block 442. A sliding groove is provided inside the fixed block 441, and a friction damper 448 is installed within the sliding groove. A slider 447 is slidably connected within the friction damper 448. A contact block is installed at one end of the slider 447, and an arc-shaped plate 449 is installed at the other end. A vibration damping pad is provided on the surface of the arc-shaped plate 449, and the vibration damping pad rests against the valve stem 3. The slider 447... A damping spring is installed at the other end, with one end of the damping spring installed at one end of the sliding groove. A rack 445 is installed on one side of the slider 447, and a support plate is installed on one side of the fixed block 441. A second rotating shaft is rotatably connected inside the support plate. A gear 446 is installed at one end of the second rotating shaft, and the gear 446 meshes with the rack 445. A first connecting rod 444 is installed at the other end of the second rotating shaft, and a second connecting rod 443 is rotatably connected at one end of the first connecting rod 444. One end of the second connecting rod 443 rotates on the movable block 442.

[0040] When the valve stem 3 is impacted and moves radially, it pushes the damping pad to move away from the valve stem 3. The damping pad moves the arc plate 449, which in turn moves the slider 447 in the friction damper 448. The slider 447 causes the damping spring to contract, which in turn moves the rack 445. The rack 445 then drives the gear 446 to rotate, which in turn drives the second shaft to rotate. The second shaft then drives the first connecting rod 444 to rotate, which in turn drives the second connecting rod 443 to rotate. The second connecting rod 443 then moves the movable block 442, which in turn exerts a reverse force on the valve stem 3. Under the combined action of the reverse force and the elastic force of the damping spring, the valve stem 3 returns to its initial position, ensuring the accuracy and reliability of the entire control system.

[0041] Working principle of the invention:

[0042] When the control valve opens, the valve core 21 moves away from the plunger 151, the fluid pressure decreases, and the fluid exits from the arc-shaped groove 251 into the first spiral groove 22. The arc-shaped spring stretches and pushes the second rolling ball 255 to move in the arc-shaped groove 251. The second rolling ball 255 drives the second connecting plate and the semi-circular block to move. The second connecting plate drives the rotating plate 253 to rotate. The rotating plate 253 drives the connecting column and the first connecting plate to move. The connecting column drives the limiting block 27 to move. The limiting block 27 drives the first rotating shaft 152 to rotate. The first rotating shaft 152 drives the conversion plate 153 to rotate. The buffer groove 154 is blocked by the conversion plate 153. The acceleration groove 155 is connected to the conversion plate 153. The plate drives the first rolling ball 254 to move, and the fluid enters the second inlet section 1551 from the inlet chamber 12. Part of the fluid enters the second diversion section 1553, and the other part enters the first acceleration section 1552. The fluid entering the first acceleration section 1552 will merge with the fluid in the second diversion section 1553, increasing the fluid velocity. Part of the fluid in the second diversion section 1553 enters the second acceleration section 1554, and the other part enters the second outlet section 1555. The fluid entering the second acceleration section 1554 will merge with the fluid in the second outlet section 1555, further increasing the fluid velocity. The fluid accelerates and flows into the outlet chamber 13.

[0043] When the control valve is closed, the control system activates the electric actuator 6. The electric actuator 6 drives the valve stem 3 to slide closer to the valve body 11 within the upper valve cover 41. The valve stem 3 drives the valve core structure 2 to slide closer to the valve body 11 within the valve cage 14. Fluid flows in the first spiral groove 22, and its kinetic energy is reduced by the first spiral groove 22 and the second spiral groove 23. One end of the second spiral groove 23 is blocked by a semi-circular block. When the limiting block 27 enters the limiting groove, the fluid flows from the first spiral groove 22 through the inlet groove into the arc-shaped groove 251, pushing the first rolling ball 254. Moving within the arc-shaped groove 251, the first rolling ball 254 drives the first connecting plate and the semicircular block to move. The first connecting plate drives the rotating plate 253 to rotate. The rotating plate 253 drives the connecting column and the second connecting plate to move. The connecting column drives the limiting block 27 to move. The limiting block 27 drives the first rotating shaft 152 to rotate. The first rotating shaft 152 drives the conversion plate 153 to rotate. The buffer groove 154 is connected to the conversion plate 153. The acceleration groove 155 is blocked by the conversion plate 153. The second connecting plate drives the second rolling ball 255 to move. The second rolling ball 255 drives the arc-shaped spring to compress.

[0044] Fluid enters from the first inlet section 1541, part of the fluid enters the first diversion section 1543, and the other part enters the first buffer section 1542. The fluid entering the first buffer section 1542 will impact the fluid in the first diversion section 1543 in the opposite direction, reducing the kinetic energy of the fluid. Part of the fluid in the first diversion section 1543 enters the second buffer section 1544, and the other part enters the first outlet section 1545. The fluid entering the second buffer section 1544 will impact the fluid in the first outlet section 1545 in the opposite direction, further reducing the kinetic energy of the fluid when it enters the first spiral groove 22.

[0045] When the fluid pressure is too high, the fluid pushes the first rolling ball 254 to the outlet channel. The fluid then enters the second spiral channel 23 from the outlet channel to reduce kinetic energy. A small portion of the high-pressure fluid enters the second outlet section 1555, a portion enters the second diversion section 1553, and another portion enters the second acceleration section 1554. The fluid entering the second acceleration section 1554 will impact the fluid in the second diversion section 1553, reducing the fluid's kinetic energy. A portion of the fluid in the second diversion section 1553 enters the first acceleration section 1552, and another portion enters the second inlet section 1551. The fluid entering the first acceleration section 1552 will impact the fluid in the second inlet section 1551, further reducing the fluid's kinetic energy. Ultimately, all kinetic energy is reduced, minimizing the mechanical stress and wear on the valve core and ensuring that the valve can maintain precise control and safe and reliable operation under extreme conditions.

[0046] When the valve stem 3 is impacted and moves radially, it pushes the damping pad to move away from the valve stem 3. The damping pad moves the arc plate 449, which in turn moves the slider 447 in the friction damper 448. The slider 447 causes the damping spring to contract, which in turn moves the rack 445. The rack 445 then drives the gear 446 to rotate, which in turn drives the second shaft to rotate. The second shaft then drives the first connecting rod 444 to rotate, which in turn drives the second connecting rod 443 to rotate. The second connecting rod 443 then moves the movable block 442, which in turn exerts a reverse force on the valve stem 3. Under the combined action of the reverse force and the elastic force of the damping spring, the valve stem 3 returns to its initial position, ensuring the accuracy and reliability of the entire control system.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A control valve with an added pressure buffer function, characterized in that: The control valve includes a valve body structure (1), an upper valve cover structure (4) is installed on one side of the valve body structure (1), a bracket (5) is installed on one side of the upper valve cover structure (4), an electric actuator (6) is installed on one side of the bracket (5), a valve stem (3) is installed at the output end of the electric actuator (6), a valve core structure (2) is installed at one end of the valve stem (3), the valve stem (3) slides in the upper valve cover structure (4), the valve core structure (2) slides in the valve body structure (1), and the electric actuator (6) is connected to the control system. The valve body structure (1) includes a valve body (11), the valve body (11) is provided with an inlet chamber (12) and an outlet chamber (13), a valve cage (14) is installed in the outlet chamber (13), and a buffer plunger structure (15) is installed inside the valve cage (14). The buffer plunger structure (15) includes a plunger (151), which is installed inside the valve cage (14). The plunger (151) is located below the valve core structure (2). The plunger (151) is provided with a buffer groove (154), an acceleration groove (155) and an installation groove inside. One end of the buffer groove (154) and the acceleration groove (155) are connected to one end of the water inlet chamber (12), and the other end of the buffer groove (154) and the acceleration groove (155) are connected to one end of the water outlet chamber (13). A first rotating shaft (152) is installed in the installation groove. A limit groove is provided in the first rotating shaft (152). A conversion plate (153) is installed at one end of the first rotating shaft (152). A conversion hole is provided in the conversion plate (153). The size of the conversion hole is larger than the size of the water inlet of the buffer groove (154). The water inlet sizes of the buffer groove (154) and the acceleration groove (155) are the same. When the control valve is opened, the first rotating shaft (152) drives the conversion plate (153) to rotate. The buffer groove (154) is blocked by the conversion plate (153). The acceleration groove (155) is connected to the conversion plate (153). The fluid passes through the acceleration groove (155) in the plunger (151) and accelerates the fluid to flow into the outlet chamber (13). When the control valve is closed, the first rotating shaft (152) drives the conversion plate (153) to rotate. The buffer groove (154) is connected to the conversion plate (153). The acceleration groove (155) is blocked by the conversion plate (153). The fluid passes through the buffer groove (154) in the plunger (151), which reduces the kinetic energy of the fluid and reduces the fluid impact.

2. A control valve with pressure buffering function according to claim 1, characterized in that: The valve core structure (2) slides inside the valve cage (14), one end of the buffer plunger structure (15) is connected to one end of the water inlet chamber (12), and the other end of the buffer plunger structure (15) is connected to one end of the water outlet chamber (13). The buffer plunger structure (15) is located below the valve core structure (2).

3. A control valve with pressure buffering function according to claim 2, characterized in that: The buffer tank (154) includes a first inlet section (1541), one end of which is connected to one end of the inlet chamber (12). The conversion plate (153) is installed in the first inlet section (1541). The other end of the first inlet section (1541) is connected to a first buffer section (1542). The other end of the first buffer section (1542) is connected to a first diversion section (1543). One end of the first diversion section (1543) is connected to the first inlet section (1541). The other end of the first diversion section (1543) is connected to a second buffer section (1544). The other end of the second buffer section (1544) is connected to a first outlet section (1545). One end of the first outlet section (1545) is connected to the first diversion section (1543). The other end of the first outlet section (1545) is connected to one end of the outlet chamber (13).

4. A control valve with pressure buffering function according to claim 3, characterized in that: The acceleration tank (155) includes a second inlet section (1551), one end of which is connected to one end of the inlet chamber (12). The conversion plate (153) is installed in the second inlet section (1551). A first acceleration section (1552) is connected to the second inlet section (1551). One end of the first acceleration section (1552) is connected to a second diversion section (1553). The other end of the second inlet section (1551) is connected to the second diversion section (1553). A second acceleration section (1554) is connected to the second diversion section (1553). One end of the second acceleration section (1554) is connected to a second outlet section (1555). One end of the second diversion section (1553) is connected to the second outlet section (1555). The other end of the second outlet section (1555) is connected to one end of the outlet chamber (13).

5. A control valve with pressure buffering function according to claim 4, characterized in that: The valve core structure (2) includes a valve core (21), which slides within a valve cage (14). The valve core (21) is located above a plunger (151). One end of the valve stem (3) is mounted on the valve core (21). An O-ring (24) is mounted on the valve core (21). The valve core (21) is provided with a first spiral groove (22), a second spiral groove (23), and a groove (28). The first spiral groove (22) is connected to the first water outlet section (1545), and the second spiral groove (23) is connected to the second water outlet section (1555). A pressure-reducing structure (25) is installed in the groove (28). The other ends of the first spiral groove (22) and the second spiral groove (23) are connected to the pressure-reducing structure (25). A rotating block (26) is mounted on one end of the pressure-reducing structure (25). A limiting block (27) is mounted on the rotating block (26), and the limiting block (27) matches the limiting groove.

6. A control valve with pressure buffering function according to claim 5, characterized in that: The pressure-relieving structure (25) includes an arc-shaped groove (251) disposed within the valve core (21). A sealing groove is provided between the arc-shaped groove (251) and the groove (28). A sealing ring (252) is rotatably connected within the sealing groove. A first rolling ball (254) and a second rolling ball (255) are installed within the arc-shaped groove (251). A first connecting plate is installed on the first rolling ball (254). A semi-circular block is installed between the first rolling ball (254) and the second rolling ball (255). The semi-circular block slides within the arc-shaped groove (251). A rotating plate (255) is installed at one end of the first connecting plate. 3) A second connecting plate is installed on the second rolling ball (255), and the other end of the second connecting plate is installed on the rotating plate (253). A connecting column is installed on one end of the rotating plate (253), and one end of the connecting column is installed in the rotating block (26). A water inlet groove and a water outlet groove are provided on one side of the arc groove (251). The water inlet groove is located at one end of the arc groove (251). The water inlet groove is connected to the first spiral groove (22), and the water outlet groove is connected to the second spiral groove (23). An arc spring is installed on the second rolling ball (255), and the other end of the arc spring is installed at the other end of the arc groove (251).

7. A control valve with pressure buffering function according to claim 6, characterized in that: The upper valve cover structure (4) includes an upper valve cover (41), which is installed on one side of the valve body (11). The valve stem (3) slides inside the upper valve cover (41). A packing pad (42) is installed inside the upper valve cover (41). A packing (43) is provided on one side of the packing pad (42). A packing sleeve (45) is installed on one side of the packing (43). A vibration damping structure (44) is installed inside the upper valve cover (41). The valve stem (3) slides inside the vibration damping structure (44).

8. A control valve with pressure buffering function according to claim 7, characterized in that: The vibration damping structure (44) includes a fixed block (441) and a movable block (442). The fixed block (441) is installed inside the upper valve cover (41), and the valve stem (3) slides in the movable block (442). The fixed block (441) has a sliding groove inside, and a friction damper (448) is installed in the sliding groove. A slider (447) is slidably connected in the friction damper (448). A contact block is installed at one end of the slider (447), and an arc plate (449) is installed at one end of the contact block. A vibration damping pad is provided on the surface of the arc plate (449), and the vibration damping pad abuts against the valve stem (3). A damping spring is installed at the other end of the block (447), one end of which is installed at one end of the sliding groove. A rack (445) is installed on one side of the slider (447), and a support plate is installed on one side of the fixed block (441). A second rotating shaft is rotatably connected inside the support plate. A gear (446) is installed at one end of the second rotating shaft. The gear (446) meshes with the rack (445). A first connecting rod (444) is installed at the other end of the second rotating shaft. A second connecting rod (443) is rotatably connected at one end of the first connecting rod (444). One end of the second connecting rod (443) rotates on the movable block (442).

9. A control valve with pressure buffering function according to claim 8, characterized in that: A first metal gasket is installed on one side of the valve cage (14), and a second metal gasket is installed on one side of the upper valve cover (41).

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