Control valve with pressure buffering function

Abstract

The invention discloses a control valve with a pressure buffering function, and relates to the technical field of control valves, the control valve comprises a valve body structure, a valve core structure, a valve rod, an upper valve cover structure, a support and an electric actuator, the valve body structure can guarantee normal and efficient conveying of water flow when the control valve is opened, and part of fluid flows reversely when the control valve is closed, so that the pressure buffering function is achieved. The force transmitted to the valve element by fluid impact is reduced, the valve element structure adopts a spiral groove and a pressure buffering structure so that the energy of the fluid can be converted and attenuated to a greater extent, mechanical stress and abrasion borne by the valve element are reduced to the maximum extent, and it is ensured that the valve can maintain accurate control and safe and reliable operation under the extreme working condition; the upper valve cover structure not only can dissipate energy by converting small-amplitude vibration into heat in a daily working state, but also can provide an effective self-correction function when encountering sudden impact, so that long-term accurate positioning and stable operation of the valve rod are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, and specifically to a control valve with a pressure buffering function. Background Art

[0002] Control valves are the general term for valves that control the flow direction, pressure, or flow rate of a medium. They are control components in fluid transportation systems and have functions such as cut-off regulation, diversion, prevention of backflow, shunting, or overflow pressure relief. With the booming development of China's industrial economy, especially the continuous expansion and upgrading in key fields such as natural gas, petrochemical, electric power, and coal chemical industries, the market demand for control valves is growing at an unprecedented rate. These industries have put forward diverse and high-standard requirements for control valves, from high temperature resistance, corrosion resistance, wear resistance to precise control and rapid response. Each index has promoted the continuous innovation and breakthrough of control valve technology.

[0003] The existing technology has defects: During long-term use, control valves are constantly subjected to external forces such as fluid impact, vibration, and pressure fluctuations. These forces can cause the internal components of the valve to shift, and at the same time, reduce its own control accuracy, affecting the stability and reliability of the entire fluid control system. Summary of the Invention

[0004] The purpose of the present invention is to provide a control valve with a pressure buffering function to solve the problems raised in the existing technology.

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

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

[0007] The buffer plunger structure includes a plunger, which is installed inside the valve cage. The plunger is located below the spool structure. The interior of the plunger is provided with a buffer groove, an acceleration groove, and a mounting groove. One end of the buffer groove and the acceleration groove is connected to one end of the water inlet chamber, and the other end of the buffer groove and the acceleration groove is connected to one end of the water outlet chamber. A first rotating shaft is installed in the mounting groove, a limiting groove is provided inside the first rotating shaft, a conversion plate is installed at one end of the first rotating shaft, a conversion hole is provided inside the conversion plate, the size of the conversion hole is larger than the size of the water inlet of the buffer groove, and the sizes of the water inlets of the buffer groove and the acceleration groove are the same. When the control valve is opened, the conversion hole of the conversion plate communicates with the acceleration groove, and the fluid enters the acceleration groove from the water inlet chamber and accelerates to flow to the water outlet chamber.

[0008] The buffer groove includes a first water inlet section, one end of the first water inlet section is connected to one end of the water inlet chamber, the conversion plate is installed in the first water inlet section, the other end of the first water inlet section is connected to a first buffer section, 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 water inlet section, 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 water outlet section, one end of the first water outlet section is connected to the first diversion section, and the other end of the first water outlet section is connected to one end of the water outlet chamber. When the fluid enters from the first water inlet section, a part of the fluid enters the first diversion section, and the other part of the fluid enters the first buffer section. The fluid entering the first buffer section will impact the fluid in the first diversion section in the reverse direction, reducing the kinetic energy of the fluid. A part of the fluid in the first diversion section enters the second buffer section, and the other part enters the first water outlet section. The fluid entering the second buffer section will impact the fluid in the first water outlet section in the reverse direction, reducing the kinetic energy of the fluid again.

[0009] The acceleration slot includes a second water inlet section. One end of the second water inlet section is connected to one end of the water inlet chamber. The conversion plate is installed in the second water inlet section. A first acceleration section is connected to the second water inlet section. One end of the first acceleration section is connected to a second diversion section. The other end of the second water 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 water outlet section. One end of the second diversion section is connected to the second water outlet section. The other end of the second water outlet section is connected to one end of the water outlet chamber. When the fluid enters from the second water inlet section, a part of the fluid enters the second diversion section, and the other part of the fluid enters the first acceleration section. The fluid entering the first acceleration section will merge with the fluid in the second diversion section to increase the flow rate of the fluid. A part of the fluid in the second diversion section enters the second acceleration section, and the other part enters the second water outlet section. The fluid entering the second acceleration section will merge with the fluid in the second water outlet section to increase the flow rate of the fluid again. When the fluid enters from the second water outlet section, a part of the fluid enters the second diversion section, and the other part of the fluid enters the second acceleration section. The fluid entering the second acceleration section will impact the fluid in the second diversion section in the reverse direction to reduce the kinetic energy of the fluid. A part of the fluid in the second diversion section enters the first acceleration section, and the other part enters the second water inlet section. The fluid entering the first acceleration section will impact the fluid in the second water inlet section in the reverse direction to reduce the kinetic energy of the fluid again.

[0010] The spool structure includes a spool. The spool slides within the valve cage. The spool is located above the plunger. One end of the valve stem is installed on the spool. An O-ring is installed on the spool. A first spiral groove, a second spiral groove, and a groove are provided inside the spool. The first spiral groove communicates with the first water outlet section. The second spiral groove communicates with the second water outlet section. A pressure relief structure is installed in the groove. The other ends of the first spiral groove and the second spiral groove are connected to the pressure relief structure. One end of the pressure relief structure is installed with a rotating block. A limiting block is installed on the rotating block. The limiting block matches the limiting groove.

[0011] The pressure relief structure includes an arc-shaped groove provided inside the valve core. A sealing groove is arranged between the arc-shaped groove and the groove, and a sealing ring is rotatably connected inside the sealing groove. A first rolling ball and a second rolling ball are installed inside the arc-shaped groove. A first connecting plate is installed on the first rolling ball, and a semi-circular block is installed between the first rolling ball and the second rolling ball. The semi-circular block slides in the arc-shaped groove. One end of the first connecting plate is installed with a rotating plate, a second connecting plate is installed on the second rolling ball, and the other end of the second connecting plate is installed on the rotating plate. One end of the rotating plate is installed with a connecting column, and one end of the connecting column is installed inside a rotating block. An inlet groove and an outlet groove are arranged on one side of the arc-shaped groove. The inlet groove is located at one end of the arc-shaped groove, and the inlet groove communicates with the first spiral groove. The outlet groove communicates with the second spiral groove. A ring-shaped spring is installed on the second rolling ball, and the other end of the ring-shaped spring is installed at the other end of the arc-shaped groove. When the control valve is closed, the valve core moves towards the direction close to the plunger. The fluid flows in the first spiral groove, and the kinetic energy is reduced by the first spiral groove and the second spiral groove. One end of the second spiral groove is blocked by a semi-circular plate. When the limiting block enters the limiting groove, the fluid enters the arc-shaped groove from the first spiral groove through the inlet 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 plate 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 first rotating shaft drives the conversion plate to rotate. The buffer groove communicates with the conversion plate, and the acceleration groove is blocked by the conversion plate. The second connecting plate drives the second rolling ball to move. The second rolling ball drives the ring-shaped spring to compress. The fluid consumes kinetic energy in the buffer groove. When the fluid pressure is too high, the fluid pushes the first rolling ball to move 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, and finally all the kinetic energy is reduced, minimizing the mechanical stress and wear on the valve core to the greatest extent, ensuring that the valve can maintain precise control and safe and reliable operation under extreme working conditions.

[0012] The upper valve cover structure includes an upper valve cover installed on one side of the valve body. The valve stem slides inside the upper valve cover. A packing gasket is installed inside the upper valve cover. A packing is arranged on one side of the packing gasket. A packing gland is installed on one side of the packing. A vibration damping structure is installed inside the upper valve cover, and the valve stem slides inside the vibration damping structure.

[0013] The damping structure includes a fixed block and a movable block. The fixed block is installed inside the upper valve cover. The valve stem slides inside the movable block. A sliding groove is provided inside the fixed block. A friction damper is installed in the sliding groove. A slider is slidably connected inside the friction damper. One end of the slider is installed with a contact block. One end of the contact block is installed with an arc-shaped plate. A damping pad is provided on the surface of the arc-shaped plate. The damping pad abuts against the valve stem. The other end of the slider is installed with a damping spring. One end of the damping spring is installed at one end of the sliding groove. A rack is installed on one side of the slider. A support plate is installed on one side of the fixed block. A second rotating shaft is rotatably connected inside the support plate. One end of the second rotating shaft is installed with a gear. The gear meshes with the rack. The other end of the second rotating shaft is installed with a first connecting rod. One end of the first connecting rod is rotatably connected with a second connecting rod. One end of the second connecting rod rotates on the movable block. When the valve stem moves radially under impact, the valve stem pushes the damping pad to move away from the valve stem. The damping pad drives the arc-shaped plate to move. The arc-shaped plate drives the slider to slide in the friction damper. The slider drives the damping spring to contract. The slider drives the rack to move. The rack drives the gear to rotate. The gear drives the second rotating shaft to rotate. The second rotating shaft drives the first connecting rod to rotate. The first connecting rod drives the second connecting rod to rotate. The second connecting rod drives the movable block to move. The movable block gives a reverse acting force to the valve stem. The valve stem returns to the initial position under the combined action of the reverse acting 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. 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 as follows: 1. When the control valve of the buffer plunger structure of the present invention is opened, the fluid passes through the acceleration groove in the plunger, enabling the fluid to obtain an appropriate acceleration effect, thereby maintaining a high and stable flow rate. The acceleration groove does not cause any obstruction to the water flow, ensuring that the fluid can smoothly enter the water outlet cavity. When the control valve is closed, the fluid passes through the buffer groove in the plunger, and part of the fluid generates reverse flow, forming a reflux effect, causing great resistance to the fluid flow, reducing the force of the 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 the key components inside the valve; 2. The valve core structure of the present invention adopts a spiral groove and a pressure relief structure. After the fluid is buffered by the buffer plunger structure, the impact energy of the fluid is dispersed and absorbed in multiple stages, forming a secondary pressure relief. Further alleviating 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 relief, enabling 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 working conditions; 3. The vibration damping structure of the present invention can convert the small-amplitude vibrations generated by the valve stem during operation due to fluid impact, vibration, or external disturbances into heat energy through the energy conversion mechanism of internal friction and elastic materials and disperse it into the surrounding environment. It can not only reduce the vibration amplitude of the valve stem itself but also prevent the decline in accuracy or component wear caused by the accumulation of long-term micro-vibrations. When the valve stem is subjected to a large impact and has a large position offset, the vibration damping structure can automatically generate a reverse acting force to offset the offset amount and make the valve stem automatically return to the initial working position, thereby ensuring the accuracy and reliability of the entire control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a partial cross-sectional view of the control valve of the present invention; Figure 2 is an exploded view of the buffer plunger structure of the present invention; Figure 3 is Figure 1 a partial enlarged view of area A in Figure 4 is an exploded view of the valve core structure of the present invention; Figure 5 is Figure 1 a partial enlarged view of area B in Figure 6 is a perspective view of the vibration damping structure of the present invention; Figure 7 is a schematic diagram of the internal structure of the vibration damping structure of the present invention.

[0017] In the figure: 1. Valve body structure; 11. Valve body; 12. Water inlet chamber; 13. Water outlet chamber; 14. Valve cage; 15. Buffer plunger structure; 151. Plunger; 152. First rotating shaft; 153. Conversion plate; 154. Buffer groove; 1541. First water inlet section; 1542. First buffer section; 1543. First diversion section; 1544. Second buffer section; 1545. First water outlet section; 155. Acceleration groove; 1551. Second water inlet section; 1552. First acceleration section; 1553. Second diversion section; 1554. Second acceleration section; 1555. Second water outlet section; 2. Spool structure; 21. Spool; 22. First spiral groove; 23. Second spiral groove; 24. O-ring; 25. Pressure relief structure; 251. Arc groove; 252. Sealing ring; 253. Rotating plate; 254. First rolling ball; 255. Second rolling ball; 26. Rotating block; 27. Limiting block; 28. Groove; 3. Valve stem; 4. Upper valve cover structure; 41. Upper valve cover; 42. Packing gasket; 43. Packing; 44. Vibration damping structure; 441. Fixed block; 442. Movable block; 443. Second connecting rod; 444. First connecting rod; 445. Rack; 446. Gear; 447. Slide block; 448. Friction damper; 449. Arc plate; 45. Packing gland; 5. Bracket; 6. Electric actuator. Detailed implementation mode

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0019] Embodiment: As Figures 1-7 shown, the present invention provides a technical solution. 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. The output end of the electric actuator 6 is installed with a valve stem 3. One end of the valve stem 3 is installed with a spool structure 2. The valve stem 3 slides in the upper valve cover structure 4, and the spool structure 2 slides in the valve body structure 1. The electric actuator 6 is connected to the control system.

[0020] The valve body structure 1 includes a valve body 11. An inlet cavity 12 and an outlet cavity 13 are arranged inside the valve body 11. A valve cage 14 is installed in the outlet cavity 13. A first metal gasket is installed on one side of the valve cage 14. A valve core structure 2 slides inside 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 cavity 12, and the other end of the buffer plunger structure 15 is connected to one end of the outlet cavity 13. The buffer plunger structure 15 is located below the valve core structure 2. When the control valve is opened, the fluid flows from the inlet cavity 12 to the outlet cavity 13 through the acceleration of the buffer plunger structure 15. 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 in the upper valve cover 41 towards the direction close to the valve body 11. The valve stem 3 drives the valve core structure 2 to slide in the valve cage 14 towards the direction close to the valve body 11.

[0021] The buffer plunger structure 15 includes a plunger 151. The plunger 151 is installed inside the valve cage 14. The plunger 151 is located below the valve core structure 2. A buffer groove 154, an acceleration groove 155 and a mounting groove are arranged inside the plunger 151. One end of the buffer groove 154 and the acceleration groove 155 is connected to one end of the inlet cavity 12, and the other end of the buffer groove 154 and the acceleration groove 155 is connected to one end of the outlet cavity 13. A first rotating shaft 152 is installed in the mounting groove. A limiting groove is arranged inside the first rotating shaft 152. A conversion plate 153 is installed at one end of the first rotating shaft 152. A conversion hole is arranged inside 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 sizes of the water inlets 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 enters the acceleration groove 155 from the inlet cavity 12 and accelerates to flow into the outlet cavity 13.

[0022] The buffer groove 154 includes a first water inlet section 1541. One end of the first water inlet section 1541 is connected to one end of the inlet cavity 12. The conversion plate 153 is installed inside the first water inlet section 1541. The other end of the first water 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 water inlet section 1541, and 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 water outlet section 1545. One end of the first water outlet section 1545 is connected to the first diversion section 1543, and the other end of the first water outlet section 1545 is connected to one end of the outlet cavity 13.

[0023] When the fluid enters from the first water inlet section 1541, a part of the fluid enters the first flow splitting section 1543, and another part of the fluid enters the first buffer section 1542. The fluid entering the first buffer section 1542 will impact the fluid in the first flow splitting section 1543 in the reverse direction, reducing the kinetic energy of the fluid. A part of the fluid in the first flow splitting section 1543 enters the second buffer section 1544, and another part enters the first water outlet section 1545. The fluid entering the second buffer section 1544 will impact the fluid in the first water outlet section 1545 in the reverse direction, reducing the kinetic energy of the fluid again.

[0024] The acceleration tank 155 includes a second water inlet section 1551. One end of the second water inlet section 1551 is connected to one end of the water inlet cavity 12. The conversion plate 153 is installed in the second water inlet section 1551. A first acceleration section 1552 is connected to the second water inlet section 1551. One end of the first acceleration section 1552 is connected to a second flow splitting section 1553. The other end of the second water inlet section 1551 is connected to the second flow splitting section 1553. A second acceleration section 1554 is connected to the second flow splitting section 1553. One end of the second acceleration section 1554 is connected to a second water outlet section 1555. One end of the second flow splitting section 1553 is connected to the second water outlet section 1555. The other end of the second water outlet section 1555 is connected to one end of the water outlet cavity 13.

[0025] When the fluid enters from the second water inlet section 1551, a part of the fluid enters the second flow splitting section 1553, and another part of the fluid enters the first acceleration section 1552. The fluid entering the first acceleration section 1552 will merge with the fluid in the second flow splitting section 1553, increasing the flow velocity of the fluid. A part of the fluid in the second flow splitting section 1553 enters the second acceleration section 1554, and another part enters the second water outlet section 1555. The fluid entering the second acceleration section 1554 will merge with the fluid in the second water outlet section 1555, increasing the flow velocity of the fluid again. When the fluid enters from the second water outlet section 1555, a part of the fluid enters the second flow splitting section 1553, and another part of the fluid enters the second acceleration section 1554. The fluid entering the second acceleration section 1554 will impact the fluid in the second flow splitting section 1553 in the reverse direction, reducing the kinetic energy of the fluid. A part of the fluid in the second flow splitting section 1553 enters the first acceleration section 1552, and another part enters the second water inlet section 1551. The fluid entering the first acceleration section 1552 will impact the fluid in the second water inlet section 1551 in the reverse direction, reducing the kinetic energy of the fluid again.

[0026] The spool structure 2 includes a spool 21 which slides within the valve cage 14. The spool 21 is located above the plunger 151. One end of the valve stem 3 is mounted on the spool 21. An O-ring 24 is installed on the spool 21. A first helical groove 22, a second helical groove 23 and a groove 28 are provided within the spool 21. The first helical groove 22 communicates with the first water outlet section 1545, and the second helical groove 23 communicates with the second water outlet section 1555. A pressure relief structure 25 is installed within the groove 28. The other ends of the first helical groove 22 and the second helical groove 23 are connected to the pressure relief structure 25. One end of the pressure relief structure 25 is equipped with a rotating block 26, and a limiting block 27 is installed on the rotating block 26. The limiting block 27 is matched with the limiting groove.

[0027] The pressure relief structure 25 includes an arc-shaped groove 251 which is provided within the spool 21. A sealing groove is provided between the arc-shaped groove 251 and the groove 28, and 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. One end of the first connecting plate is equipped with a rotating plate 253. 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. One end of the rotating plate 253 is equipped with a connecting column, and one end of the connecting column is installed within the rotating block 26. A water inlet groove and a water outlet groove are provided on one side of the arc-shaped groove 251. The water inlet groove is located at one end of the arc-shaped groove 251 and communicates with the first helical groove 22, and the water outlet groove communicates with the second helical groove 23. An annular spring is installed on the second rolling ball 255, and the other end of the annular spring is installed at the other end of the arc-shaped groove 251.

[0028] When the control valve is closed, the valve core 21 moves towards the plunger 151. The fluid flows in the first spiral groove 22, and the kinetic energy is dissipated by the first spiral groove 22 and the second spiral groove 23. One end of the second spiral groove 23 is blocked by the semi-circular plate. 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 plate 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 communicates with the conversion plate 153, and the acceleration groove 155 is blocked by the conversion plate 153. The second connecting plate drives the second rolling ball 255 to move, and the second rolling ball 255 drives the annular spring to compress. The kinetic energy of the fluid is consumed by the buffer groove 154. When the fluid pressure is too high, the fluid pushes the first rolling ball 254 to move all the way to the water outlet groove. The fluid enters the second spiral groove 23 from the water outlet groove to dissipate kinetic energy. A small part of the high-pressure fluid enters the second water outlet section 1555, and finally all the kinetic energy is dissipated, minimizing the mechanical stress and wear on the valve core to ensure that the valve can maintain precise control and safe and reliable operation under extreme working conditions.

[0029] The upper valve cover structure 4 includes an upper valve cover 41. The upper valve cover 41 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 arranged on one side of the packing gasket 42. A packing gland 45 is installed on one side of the packing 43. A damping structure 44 is installed inside the upper valve cover 41, and the valve stem 3 slides inside the damping structure 44.

[0030] The 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 inside the movable block 442. A sliding groove is arranged inside the fixed block 441, and a friction damper 448 is installed in the sliding groove. A slider 447 is slidably connected inside the friction damper 448. One end of the slider 447 is installed with a contact block, and one end of the contact block is installed with an arc plate 449. A damping pad is arranged on the surface of the arc plate 449, and the damping pad abuts against the valve stem 3. The other end of the slider 447 is installed with a damping spring, and one end of the damping spring is installed at one end of the sliding groove. A rack 445 is installed on one side of the slider 447. A support plate is installed on one side of the fixed block 441, and 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. One end of the first connecting rod 444 is rotatably connected with a second connecting rod 443, and one end of the second connecting rod 443 rotates on the movable block 442.

[0031] When the valve stem 3 moves radially under impact, the valve stem 3 pushes the shock-absorbing pad to move away from the valve stem 3. The shock-absorbing pad drives the arc-shaped plate 449 to move. The arc-shaped plate 449 drives the slider 447 to slide in the friction damper 448. The slider 447 drives the shock-absorbing spring to contract. The slider 447 drives the rack 445 to move. The rack 445 drives the gear 446 to rotate. The gear 446 drives the second rotating shaft to rotate. The second rotating shaft drives the first connecting rod 444 to rotate. The first connecting rod 444 drives the second connecting rod 443 to rotate. The second connecting rod 443 drives the movable block 442 to move. The movable block 442 gives a reverse acting force to the valve stem 3. The valve stem 3 returns to the initial position under the combined action of the reverse acting force and the elastic force of the shock-absorbing spring, ensuring the accuracy and reliability of the entire control system.

[0032] The working principle of the present invention: When the control valve is opened, the valve core 21 leaves the plunger 151, the fluid pressure decreases, and the fluid withdraws from the arc-shaped groove 251 into the first spiral groove 22. The annular 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 plate 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, and the acceleration groove 155 communicates with the conversion plate 153. The first connecting plate drives the first rolling ball 254 to move. The fluid enters from the water inlet cavity 12 into the second water inlet section 1551. Part of the fluid enters the second shunt section 1553, and another part of the fluid enters the first acceleration section 1552. The fluid entering the first acceleration section 1552 will merge with the fluid in the second shunt section 1553 to increase the fluid velocity. Part of the fluid in the second shunt section 1553 enters the second acceleration section 1554, and another part enters the second water outlet section 1555. The fluid entering the second acceleration section 1554 will merge with the fluid in the second water outlet section 1555 to increase the fluid velocity again. The fluid accelerates and flows into the water outlet cavity 13.

[0033] 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 in the upper valve cover 41 towards the valve body 11. The valve stem 3 drives the valve core structure 2 to slide in the valve cage 14 towards the valve body 11. The fluid flows in the first spiral groove 22, and 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 the semi-circular plate. When the limit block 27 enters the limit 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 plate 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 limit block 27 to move. The limit 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 communicates with the conversion plate 153, and the acceleration groove 155 is blocked by the conversion plate 153. The second connecting plate drives the second rolling ball 255 to move, and the second rolling ball 255 drives the annular spring to compress.

[0034] The fluid enters from the first water inlet section 1541. Part of the fluid enters the first diversion section 1543, and the other part of the fluid 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 reverse 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 water outlet section 1545. The fluid entering the second buffer section 1544 will impact the fluid in the first water outlet section 1545 in the reverse direction, reducing the kinetic energy of the fluid when it enters the first spiral groove 22 again.

[0035] When the fluid pressure is too high, the fluid pushes the first rolling ball 254 to move all the way to the water outlet groove. The fluid enters the second spiral groove 23 from the water outlet groove to reduce the kinetic energy. A small part of the high-pressure fluid enters the second water outlet section 1555. Part of the fluid enters the second diversion section 1553, and the other part of the fluid 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 reverse direction, reducing the kinetic energy of the fluid. Part of the fluid in the second diversion section 1553 enters the first acceleration section 1552, and the other part enters the second water inlet section 1551. The fluid entering the first acceleration section 1552 will impact the fluid in the second water inlet section 1551 in the reverse direction, reducing the kinetic energy of the fluid again. Finally, all the kinetic energy is reduced, minimizing the mechanical stress and wear on the valve core to ensure that the valve can maintain precise control and safe and reliable operation under extreme working conditions.

[0036] When the valve stem 3 moves radially under impact, the valve stem 3 pushes the shock-absorbing pad to move away from the valve stem 3. The shock-absorbing pad drives the arc-shaped plate 449 to move. The arc-shaped plate 449 drives the slider 447 to slide in the friction damper 448. The slider 447 drives the shock-absorbing spring to contract. The slider 447 drives the rack 445 to move. The rack 445 drives the gear 446 to rotate. The gear 446 drives the second rotating shaft to rotate. The second rotating shaft drives the first connecting rod 444 to rotate. The first connecting rod 444 drives the second connecting rod 443 to rotate. The second connecting rod 443 drives the movable block 442 to move. The movable block 442 gives a reverse acting force to the valve stem 3. The valve stem 3 returns to the initial position under the combined action of the reverse acting force and the elastic force of the shock-absorbing spring, ensuring the accuracy and reliability of the entire control system.

[0037] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

Claims

1. A control valve with a pressure buffer function, characterized in that: The control valve comprises 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 a control system.

2. A control valve with pressure buffering function according to claim 1, characterized in that: The valve body structure (1) comprises a valve body (11), wherein a water inlet chamber (12) and a water outlet chamber (13) are arranged inside the valve body (11), a valve cage (14) is installed inside the water outlet chamber (13), the valve core structure (2) slides inside 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 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), and 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 plunger structure (15) comprises a plunger (151), wherein the plunger (151) is installed inside the valve cage (14), the plunger (151) is located below the valve core structure (2), and a buffer groove (154), an acceleration groove (155) and a mounting groove are provided inside the plunger (151), 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), and a first rotating shaft (152) is installed in the mounting groove, a limiting groove is provided in 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 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), and the water inlet of the buffer groove (154) and the acceleration groove (155) have the same size.

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

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

6. A control valve with pressure buffering function according to claim 5, characterized in that: The valve core structure (2) comprises a valve core (21), the valve core (21) slides in 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), a first spiral groove (22), a second spiral groove (23) and a groove (28) are arranged in the valve core (21), the first spiral groove (22) is connected to the first water outlet section (1545), the second spiral groove (23) is connected to the second water outlet section (1555), a pressure relief structure (25) is mounted in the groove (28), the other ends of the first spiral groove (22) and the second spiral groove (23) are connected to the pressure relief structure (25), a rotating block (26) is mounted on one end of the pressure relief structure (25), a limiting block (27) is mounted on the rotating block (26), and the limiting block (27) matches the limiting groove.

7. A control valve with pressure buffering function according to claim 6, characterized in that: The pressure relief structure (25) comprises an arc groove (251), wherein the arc groove (251) is arranged in the valve core (21), a sealing groove is arranged between the arc groove (251) and the groove (28), a sealing ring (252) is rotatably connected in the sealing groove, a first rolling ball (254) and a second rolling ball (255) are installed in the arc groove (251), a first connecting plate is installed on the first rolling ball (254), a semicircular block is installed between the first rolling ball (254) and the second rolling ball (255), the semicircular block slides in the arc groove (251), and a rotating plate (252) is installed at one end of the first connecting plate. 3), a second connecting plate is mounted on the second rolling ball (255), the other end of the second connecting plate is mounted on the rotating plate (253), a connecting column is mounted on one end of the rotating plate (253), one end of the connecting column is mounted in the rotating block (26), a water inlet groove and a water outlet groove are arranged 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 annular spring is mounted on the second rolling ball (255), and the other end of the annular spring is mounted on the other end of the arc groove (251).

8. The control valve with pressure buffering function according to claim 7, characterized in that: The upper valve cover structure (4) comprises an upper valve cover (41), wherein the upper valve cover (41) is mounted on one side of the valve body (11), the valve stem (3) slides in the upper valve cover (41), a packing pad (42) is mounted inside the upper valve cover (41), a packing (43) is arranged on one side of the packing pad (42), a packing sleeve (45) is mounted on one side of the packing (43), a vibration reduction structure (44) is mounted in the upper valve cover (41), and the valve stem (3) slides in the vibration reduction structure (44).

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

10. A control valve with pressure buffering function according to claim 9, 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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