Low friction electrically controlled ball valve with double valve seat

Abstract

The application discloses a low-friction electric control ball valve with double valve seats, and relates to the technical field of ball valves.The low-friction electric control ball valve comprises a valve body, a valve core rotatably arranged in the valve body, a valve seat assembly comprising a main valve seat and a secondary valve seat, and a hydraulic linkage mechanism.The main valve seat is always attached to the sealing surface of the valve core through a pre-tightening spring, the hydraulic linkage mechanism is linked with the opening and closing action of the valve core, the secondary valve seat is driven to separate from the valve core during the opening and closing process of the valve core to reduce friction, and the secondary valve seat is reset to form double sealing with the main valve seat after the opening and closing are completed.The execution assembly drives the valve core to rotate, the adjusting structure can finely adjust the sealing pressure, and the auxiliary sealing structure strengthens the sealing effect.The scheme realizes the cooperation of low friction and double sealing, reduces the execution load and energy consumption, slows down the wear of parts, is reasonable in structure, convenient to operate, strong in adaptability, and can be widely applied to various industrial fluid control scenes.

Description

Technical Field

[0001] As a core actuator in industrial fluid control systems, the electrically controlled ball valve is widely used in many fields such as petrochemicals, hydrogen energy, semiconductors, municipal water supply, nuclear power, and deep-sea oil and gas due to its advantages such as compact structure, rapid opening and closing, and convenient flow regulation. It undertakes the functions of cutting off, regulating and controlling fluid transportation, and its performance directly affects the operational stability, safety and energy efficiency of the entire fluid system.

[0002] However, existing dual-seat electrically controlled ball valves still have shortcomings in practical applications, especially in the synergistic optimization of friction loss and sealing performance. On the one hand, because both sides of the ball contact the valve seat in a dual-seat structure, the friction contact area is larger than that of a single-seat ball valve. During the opening and closing process driven by the electrically controlled actuator to rotate the ball, a large frictional resistance is easily generated between the ball and the dual valve seats, increasing the load on the electrically controlled actuator, leading to increased energy consumption, slower opening and closing response speed, and accelerated wear of the valve seat sealing surface. This, in turn, leads to a decrease in sealing performance, an increased risk of leakage, and a significant shortening of the valve's service life.

[0003] Therefore, it is necessary to provide a low-friction electrically controlled ball valve with dual seats to solve the above-mentioned technical problems. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a low-friction electrically controlled ball valve with dual valve seats.

[0005] This invention provides a low-friction electrically controlled ball valve with dual valve seats, comprising a valve body and a valve core rotatably disposed inside the valve body. The valve body also includes a valve seat assembly for sealing the valve core, comprising a main valve seat and a secondary valve seat. The main valve seat has multiple preload springs evenly spaced circumferentially on its side opposite to the valve core. One end of each preload spring is fixedly connected to the main valve seat, and the other end is fixedly connected to the inner wall of the valve body. The spring force of the preload springs presses the main valve seat against the valve core sealing surface. The secondary valve seat is coaxially slidably connected to the outer ring of the main valve seat, and the secondary valve seat is sealed to the valve core sealing surface. Correspondingly, the valve body is also provided with a hydraulic linkage mechanism for driving the auxiliary valve seat to slide axially. The hydraulic linkage mechanism is convexly connected to the auxiliary valve seat, and the action of the hydraulic linkage mechanism is linked and coordinated with the opening and closing action of the valve core. When the valve core is in the process of opening or closing, the hydraulic linkage mechanism applies pressure to drive the auxiliary valve seat to move away from the valve core, so that the sealing surface of the auxiliary valve seat is separated from the valve core. When the valve core is fully opened or fully closed, the hydraulic linkage mechanism is depressurized, and the auxiliary valve seat is pressed against the sealing surface of the valve core under the reverse force of the hydraulic linkage mechanism.

[0006] Furthermore, the valve body is also provided with an actuator for driving the valve core to rotate. The actuator includes a valve cover fixedly connected to the valve body, a valve stem rotatably connected inside the valve cover, the bottom end of the valve stem being fixed to the outer wall of the valve core, and an electric actuator for driving the valve stem to rotate is also installed on the top surface of the valve cover.

[0007] Furthermore, the hydraulic linkage mechanism includes a mounting box installed on the valve cover, a piston cylinder installed on the outer wall of the mounting box, a first piston plate slidably installed inside the piston cylinder, an infusion pipe connected to the piston cylinder, an annular oil injection channel opened inside the valve body, and the other end of the infusion pipe communicating with the annular oil injection channel; a sealing cavity opened inside the valve body, an oil injection hole opening inside the valve body communicating with the annular oil injection channel, a second piston plate slidably installed inside the sealing cavity, a second piston rod connected to one side of the second piston plate, and the other end of the second piston rod fixedly connected to the auxiliary valve seat.

[0008] Furthermore, a limiting plate is slidably installed inside the mounting box, and an adjusting nut is rotatably connected to the bottom surface of the limiting plate. The adjusting nut is threadedly connected to the valve stem. A first piston rod is connected to one side of the first piston plate. The end of the first piston rod away from the first piston plate extends to the mounting box and is hinged to a connecting rod. The other end of the connecting rod is hinged to the adjusting nut.

[0009] Furthermore, a return spring is also fitted on the second piston rod. One end of the return spring is connected to the second piston plate, and the other end is connected to the inner wall of the sealing cavity. Under the elastic force of the return spring, the auxiliary valve seat is pulled away from the sealing surface of the valve core.

[0010] Furthermore, an adjusting seat is slidably disposed inside the sealing cavity. The adjusting seat moves to change the cavity volume of the sealing cavity. Multiple adjusting bolts are threaded onto the valve body. The multiple adjusting bolts are equidistantly distributed along the circumference of the valve body. Each adjusting bolt is perpendicular to the adjusting seat. The side of the adjusting seat away from the sealing cavity is a sloped structure. The bottom end of the adjusting bolt is provided with a mating surface that fits into the sloped structure.

[0011] Furthermore, the valve body is also provided with a driving component that drives all the adjusting bolts to rotate synchronously. The driving component includes a driven bevel gear connected to the top of the adjusting bolt. A turntable is rotatably mounted on the outer wall of the valve body. A driving bevel gear is connected to one side of the turntable. The driving bevel gear and the driven bevel gear are meshed together.

[0012] Furthermore, both the main valve seat and the auxiliary valve seat have embedded sealing rings on their outer surfaces. The sealing rings fit against the inner wall of the valve body, and the main valve seat and the auxiliary valve seat are sealed to the inner wall of the valve body through the sealing rings.

[0013] Furthermore, both the main valve seat and the auxiliary valve seat are equipped with sealing rings on the side near the valve core, and the sealing rings are in contact with the sealing surface of the valve core.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, through the linkage between the hydraulic linkage mechanism and the valve core opening and closing action, separates the auxiliary valve seat from the valve core sealing surface during the valve core opening and closing process, with only the main valve seat contacting the valve core. This significantly reduces the frictional contact area, lowers the load and energy consumption of the actuators such as the electric actuator and valve stem. At the same time, after the valve core is opened or closed, the auxiliary valve seat resets and fits with the main valve seat to form a double seal. With the auxiliary sealing of the sealing ring and sealing ring, the sealing reliability is significantly improved, fluid leakage is avoided, and the wear of the main valve seat, auxiliary valve seat and valve core is reduced, extending the overall service life of the device.

[0015] 2. In this invention, the actuator and hydraulic linkage mechanism are integrated into one unit, resulting in stable transmission and a low probability of failure. The sealing cavity pressure can be adjusted synchronously by adjusting the bolts, adjusting seat and driving components, and the contact force of the secondary valve seat can be precisely controlled to adapt to different pressure conditions. At the same time, the overall structure is compact and easy to install and maintain, and can be widely used in fluid control scenarios in various industrial fields such as petrochemical, hydrogen energy and semiconductor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear view structure of the present invention; Figure 3 This is a front view structural diagram of the present invention; Figure 4 This is a side view of the structure of the present invention; Figure 5 For along Figure 4 A schematic diagram of the cross-sectional structure along the center section AA; Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle.

[0017] The following are the labeling elements in the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Valve core; 5. Mounting box; 6. Limit plate; 7. Adjusting nut; 8. Connecting rod; 9. Piston cylinder; 10. First piston plate; 11. First piston rod; 12. Infusion tube; 13. Electric actuator; 14. Main valve seat; 15. Preload spring; 16. Secondary valve seat; 17. Sealing ring; 18. Sealing ring; 19. Sealing cavity; 20. Second piston plate; 21. Second piston rod; 22. Return spring; 23. Annular oil injection channel; 24. Oil injection hole; 25. Adjusting seat; 26. Adjusting bolt; 27. Driven bevel gear; 28. Turntable; 29. ​​Driving bevel gear. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0020] Please see Figure 1 - Figure 6 This invention provides a technical solution: a low-friction electrically controlled ball valve with dual valve seats, comprising a valve body 1 and a valve core 4 rotatably disposed inside the valve body 1. The valve body 1 also includes a valve seat assembly for sealing the valve core 4, comprising a main valve seat 14 and a secondary valve seat 16. The main valve seat 14, on its side opposite to the valve core 4, has multiple preload springs 15 evenly spaced circumferentially. One end of each preload spring 15 is fixedly connected to the main valve seat 14, and the other end is fixedly connected to the inner wall of the valve body 1. The elastic force of the preload springs 15 presses the main valve seat 14 against the sealing surface of the valve core 4. The secondary valve seat 16 is coaxially slidably connected to the outer ring of the main valve seat 14. The auxiliary valve seat 16 corresponds to the sealing surface of the valve core 4. The valve body 1 is also provided with a hydraulic linkage mechanism for driving the auxiliary valve seat 16 to slide axially. The hydraulic linkage mechanism is connected to the auxiliary valve seat 16 in a transmission manner, and the action of the hydraulic linkage mechanism is linked with the opening and closing action of the valve core 4. When the valve core 4 is in the process of opening or closing, the hydraulic linkage mechanism applies pressure to drive the auxiliary valve seat 16 to move away from the valve core 4, so that the auxiliary valve seat 16 is separated from the sealing surface of the valve core 4. When the valve core 4 is fully opened or fully closed, the hydraulic linkage mechanism is depressurized, and the auxiliary valve seat 16 is pressed against the sealing surface of the valve core 4 under the reverse force of the hydraulic linkage mechanism.

[0021] Specifically, the main valve seat 14 and the auxiliary valve seat 16 inside the valve body 1 form a valve seat assembly for sealing the valve stem 3; the preload springs 15 are evenly distributed around the main valve seat 14, with their ends fixing the main valve seat 14 and the inner wall of the valve body 1 respectively, ensuring that the main valve seat 14 is always pressed against the sealing surface of the valve core 4 under the action of the spring force; the auxiliary valve seat 16 is coaxially slidably connected to the outer ring of the main valve seat 14, corresponding to the sealing surface of the valve core 4; the hydraulic linkage mechanism is drivenly connected to the auxiliary valve seat 16, and its action is linked to the opening and closing of the valve core 4. During the opening and closing of the valve core 4, the hydraulic linkage mechanism... The pressure drives the secondary valve seat 16 away from the sealing surface of the valve core 4. After the valve core 4 is opened and closed, the hydraulic linkage mechanism is depressurized. Under the reverse force, the secondary valve seat 16 presses against the sealing surface of the valve core 4, which solves the problem of large frictional contact area in existing double-seat ball valves. When the valve core 4 is opened and closed, only the main valve seat 14 contacts the valve core 4, which greatly reduces frictional resistance, reduces the load and energy consumption of the actuator, and slows down the wear of the valve seat and valve core 4. After the valve core 4 is opened and closed, a double seal is formed, which solves the problem of difficulty in achieving both sealing and low friction, improves sealing reliability, avoids leakage, and extends the service life of the device.

[0022] As a technical optimization of the present invention, the valve body 1 is further provided with an actuator for driving the valve core 4 to rotate. The actuator includes a valve cover 2 fixedly connected to the valve body 1, a valve stem 3 rotatably connected inside the valve cover 2, the bottom end of the valve stem 3 being fixed to the outer wall of the valve core 4, and an electric actuator 13 for driving the valve stem 3 to rotate is also installed on the top surface of the valve cover 2.

[0023] Specifically, the actuator on the valve body 1 drives the valve core 4 to rotate. The valve cover 2 is fixed to the valve body 1 and internally connected to the valve stem 3. The bottom end of the valve stem 3 is fixed to the outer wall of the valve core 4. After the electric actuator 13 on the top surface of the valve cover 2 is started, it drives the valve stem 3 to rotate, which in turn drives the valve core 4 to rotate inside the valve body 1, realizing the opening and closing of the fluid channel. This solves the problems of unstable transmission and slow opening and closing response of the actuator in the background technology. Through the coordinated cooperation of the valve cover 2, the valve stem 3 and the electric actuator 13, the valve core 4 can be opened and closed accurately and quickly. The valve cover 2 provides a sealing and protection function for the valve stem 3, preventing impurities from entering and causing the valve stem 3 to jam. At the same time, it provides a stable installation foundation for the electric actuator 13, improves the structural stability, and further extends the service life of the device.

[0024] As an optimized technical solution of the present invention, the hydraulic linkage mechanism includes a mounting box 5 mounted on the valve cover 2. A limit plate 6 is slidably mounted inside the mounting box 5. An adjusting nut 7 is rotatably connected to the bottom surface of the limit plate 6. The adjusting nut 7 is threadedly connected to the valve stem 3. A piston cylinder 9 is mounted on the outer wall of the mounting box 5. A first piston plate 10 is slidably mounted inside the piston cylinder 9. A first piston rod 11 is connected to one side of the first piston plate 10. The end of the first piston rod 11 away from the first piston plate 10 extends to the mounting box 5 and is hinged to a connecting rod 8. The other end of the connecting rod 8 is hinged to the adjusting nut 7. The piston cylinder 9 is also connected to the infusion tube 12. The valve body 1 has an annular oil injection channel 23 inside. The other end of the infusion tube 12 is connected to the annular oil injection channel 23. The valve body 1 also has a sealing cavity 19 inside. The valve body 1 has an oil injection hole 24 inside that connects the sealing cavity 19 and the annular oil injection channel 23. The sealing cavity 19 has a second piston plate 20 slidably installed inside. The second piston plate 20 is connected to a second piston rod 21 on one side. The other end of the second piston rod 21 is fixedly connected to the auxiliary valve seat 16.

[0025] Specifically, the hydraulic linkage mechanism is mounted on the valve cover 2 via the mounting box 5, the limiting plate 6 is slidably disposed within the mounting box 5, and the adjusting nut 7, rotatably connected to the bottom surface, is threadedly connected to the valve stem 3; the piston cylinder 9 is mounted on the outer wall of the mounting box 5, and the first piston plate 10 inside is connected to the first piston rod 11, which extends into the mounting box 5 and is hinged to the adjusting nut 7 via the connecting rod 8; the piston cylinder 9 is connected to the annular oil injection channel 23 of the valve body 1 via the infusion pipe 12, and the annular oil injection channel 23 is connected to the sealing cavity 19 via the oil injection hole 24, and the second piston plate 20 inside the sealing cavity 19 is connected to the second piston rod 21, which is fixed to the auxiliary valve seat 16; when the valve stem 3 rotates, it drives the adjusting nut 7. Axial movement, via connecting rod 8, pulls the first piston rod 11 and the first piston plate 10 to slide, sending hydraulic oil through the inlet pipe 12, annular oil injection channel 23, and oil injection hole 24 into the sealing cavity 19, pushing the second piston plate 20 and the second piston rod 21 to move the auxiliary valve seat 16. This solves the problems of unreliable hydraulic linkage and poor low-friction effect in the background technology, achieving precise linkage between the opening and closing actions of the auxiliary valve seat 16 and the valve core 4, avoiding friction aggravation or sealing failure caused by linkage lag; the structure has a high degree of integration, with integrated design with the actuator, reducing component redundancy and lowering the probability of failure. At the same time, the annular oil injection channel 23 and oil injection hole 24 ensure stable hydraulic transmission, further enhancing the low-friction and sealing effect.

[0026] As a technical optimization of the present invention, a return spring 22 is also sleeved on the second piston rod 21. One end of the return spring 22 is connected to the second piston plate 20, and the other end is connected to the inner wall of the sealing cavity 19. Under the elastic force of the return spring 22, the auxiliary valve seat 16 is pulled away from the sealing surface of the valve core 4.

[0027] Specifically, the return spring 22 is sleeved on the second piston rod 21, with its two ends connected to the second piston plate 20 and the inner wall of the sealing cavity 19, respectively. Under the action of the spring force, it can pull the auxiliary valve seat 16 away from the sealing surface of the valve core 4. With the pressure of the hydraulic linkage mechanism, the auxiliary valve seat 16 can be flexibly separated and reset, solving the problem of untimely reset and loose fit of the auxiliary valve seat 16 in the background technology. When the valve core 4 is started, it helps the auxiliary valve seat 16 to quickly disengage, further reducing friction. When the hydraulic pressure is released, it helps the auxiliary valve seat 16 to quickly reset and fit, avoiding leakage caused by sealing lag. At the same time, it prevents the auxiliary valve seat 16 from getting stuck, reduces component wear, and improves structural reliability.

[0028] As a technical optimization of the present invention, an adjusting seat 25 is slidably arranged inside the sealing cavity 19. The adjusting seat 25 moves to change the cavity volume of the sealing cavity 19. A plurality of adjusting bolts 26 are threadedly connected to the valve body 1. The plurality of adjusting bolts 26 are distributed at equal intervals along the circumference of the valve body 1. Each adjusting bolt 26 is perpendicular to the adjusting seat 25. The side of the adjusting seat 25 away from the sealing cavity 19 is a slope structure. The bottom end of the adjusting bolt 26 is provided with a mating surface that fits with the slope structure.

[0029] Specifically, the adjusting seat 25 is slidably disposed within the sealing cavity 19, and the size of the cavity can be adjusted by sliding. Multiple adjusting bolts 26 are evenly distributed around the valve body 1, threaded onto the valve body 1 and perpendicular to the adjusting seat 25. The side of the adjusting seat 25 away from the sealing cavity 19 is inclined, and the bottom mating surface of the adjusting bolts 26 fits against this inclined surface. Rotating the adjusting bolts 26 can push the adjusting seat 25 to slide, solving the problems of non-adjustable sealing pressure and poor adaptability in the prior art. It can finely adjust the hydraulic pressure of the sealing cavity 19, accurately control the contact force of the secondary valve seat 16, adapt to different pressure conditions, and avoid excessive tightness leading to increased resistance or excessive looseness leading to leakage. The equidistant distribution of multiple adjusting bolts 26 ensures that the adjusting seat 25 is subjected to uniform force, avoids deformation of the sealing cavity 19, and improves the stability of hydraulic transmission.

[0030] As a technical optimization of the present invention, the valve body 1 is also provided with a driving component that drives each adjusting bolt 26 to rotate synchronously. The driving component includes a driven bevel gear 27 connected to the top of the adjusting bolt 26. A turntable 28 is rotatably mounted on the outer wall of the valve body 1. A driving bevel gear 29 is connected to one side of the turntable 28. The driving bevel gear 29 and the driven bevel gear 27 are meshed and connected.

[0031] Specifically, in the driving component, the driven bevel gear 27 is connected to the top of the adjusting bolt 26, and the turntable 28 is rotatably mounted on the outer wall of the valve body 1. The driving bevel gear 29 connected on one side meshes with the driven bevel gear 27. Rotating the turntable 28 can drive the driven bevel gear 27 to rotate synchronously through the driving bevel gear 29, thereby driving each adjusting bolt 26 to rotate synchronously. This solves the problem of asynchronous adjustment of multiple adjusting bolts 26 in the prior art, ensures that the adjusting seat 25 is subjected to uniform force and slides smoothly, and avoids pressure imbalance that leads to deviation in the contact of the secondary valve seat 16 and increased friction. It eliminates the need for individual adjustment, reduces the difficulty of operation, and improves the adjustment efficiency and accuracy.

[0032] As a technical optimization of the present invention, sealing rings 18 are embedded on the outer surfaces of both the main valve seat 14 and the auxiliary valve seat 16. The sealing rings 18 are in contact with the inner wall of the valve body 1, and the main valve seat 14 and the auxiliary valve seat 16 are sealed to the inner wall of the valve body 1 through the sealing rings 18.

[0033] Specifically, the sealing ring 18 is embedded in the outer surface of the main valve seat 14 and the auxiliary valve seat 16, and fits against the inner wall of the valve body 1, so as to achieve the sealing between the main valve seat 14, the auxiliary valve seat 16 and the inner wall of the valve body 1, solve the problem of poor sealing and easy leakage in the prior art, avoid hydraulic oil or conveying fluid leakage, ensure stable hydraulic transmission, prevent equipment corrosion and resource waste caused by fluid leakage, and at the same time protect the inner wall of the valve body 1 and the valve seat, reduce wear, and extend the service life of the device.

[0034] As a technical optimization of the present invention, a sealing ring 17 is installed on the side of the main valve seat 14 and the auxiliary valve seat 16 near the valve core 4, and the sealing ring 17 is in contact with the sealing surface of the valve core 4.

[0035] Specifically, the sealing ring 17 is installed on the side of the main valve seat 14 and the auxiliary valve seat 16 near the valve core 4, and fits against the sealing surface of the valve core 4 to enhance the sealing effect between them, solve the problem of rapid wear of the sealing surface and decline in sealing performance in the background technology, buffer the contact pressure between the valve seat and the valve core 4, reduce direct friction, and slow down wear; at the same time, it enhances the sealing effect and avoids leakage. The sealing ring 17 can be made of low friction material to further reduce frictional resistance. In conjunction with the separation action of the auxiliary valve seat 16, the low friction effect is optimized in two ways, reducing the load and energy consumption of the actuator.

[0036] The core working logic of this low-friction electrically controlled ball valve with dual seats is as follows: The valve core 4 is rotated by the actuator to achieve fluid opening, closing, and regulation. Relying on the coordinated action of the main valve seat 14 and the auxiliary valve seat 16, while ensuring the reliability of the dual seal, the separation and contact of the sealing surfaces of the auxiliary valve seat 16 and the valve core 4 are controlled by a hydraulic linkage mechanism. This minimizes the frictional resistance during the opening and closing process of the valve core 4, solving the technical defects of existing dual-seat ball valves, such as high frictional loss and difficulty in simultaneously achieving sealing and low friction. The specific working process is divided into an opening and closing action process and a sealing and pressure holding process. All components work together to achieve the overall function. The detailed principle is as follows: The opening and closing power of the device is provided by the actuator, which includes a valve cover 2 fixedly connected to the valve body 1. A valve stem 3 is rotatably connected inside the valve cover 2. The bottom end of the valve stem 3 is fixed to the outer wall of the valve core 4. After the electric actuator 13 installed on the top surface of the valve cover 2 is started, it drives the valve stem 3 to rotate around its own axis. The valve stem 3 synchronously drives the valve core 4 fixed to it to rotate inside the valve body 1, thereby realizing the opening or closing of the fluid channel and completing the basic fluid cut-off and regulation functions.

[0037] To reduce the frictional resistance when the valve core 4 rotates, the hydraulic linkage mechanism is linked with the opening and closing action of the valve core 4. The specific linkage process is as follows: The hydraulic linkage mechanism includes a mounting box 5 installed on the valve cover 2. A limit plate 6 is slidably installed inside the mounting box 5. An adjusting nut 7 is rotatably connected to the bottom surface of the limit plate 6. The adjusting nut 7 is threadedly connected to the valve stem 3. When the electric actuator 13 drives the valve stem 3 to rotate, the rotation of the valve stem 3 will drive the adjusting nut 7 threadedly connected to it to move axially along the valve stem 3. The adjusting nut 7 simultaneously pulls the hinged connecting rod 8. The connecting rod 8 drives the first piston rod 11 hinged to it to move, thereby pushing the first piston plate 10 inside the piston cylinder 9 to slide. When the first piston plate 10 slides inside the piston cylinder 9, it will transport the hydraulic oil in the piston cylinder 9 to the annular oil injection channel 23 opened inside the valve body 1 through the infusion pipe 12. The hydraulic oil enters the sealing cavity 19 inside the valve body 1 through the oil injection hole 24 via the annular oil injection channel 23 and applies pressure to the second piston plate 20 inside the sealing cavity 19. Under the pressure of hydraulic oil, the second piston plate 20 overcomes the elastic force of the return spring 22 and slides, synchronously driving the fixed second piston rod 21 to move. The second piston rod 21 drives the auxiliary valve seat 16 to move away from the sealing surface of the valve core 4, so that the auxiliary valve seat 16 is completely separated from the sealing surface of the valve core 4. At this time, only the main valve seat 14 is pressed against the sealing surface of the valve core 4 under the elastic force of the preload spring 15. When the valve core 4 rotates, it only rubs against the main valve seat 14, which greatly reduces the frictional contact area, realizes low-friction opening and closing, reduces the load on the electric actuator 13, and reduces energy consumption and component wear.

[0038] When the valve core 4 is fully open or fully closed, the electric actuator 13 stops working, the valve stem 3 stops rotating, the adjusting nut 7 no longer moves axially along the valve stem 3, the tension of the connecting rod 8 on the first piston rod 11 disappears, and the hydraulic pressure in the piston cylinder 9 is relieved. At this time, the hydraulic oil pressure in the sealing chamber 19 decreases, and the second piston plate 20 slides in the opposite direction under the elastic force of the return spring 22, driving the second piston rod 21 and the auxiliary valve seat 16 to move towards the sealing surface of the valve core 4. Finally, the auxiliary valve seat 16 presses against the same sealing surface of the valve core 4, forming a double sealing structure with the always-fitting main valve seat 14, improving sealing reliability and preventing fluid leakage.

[0039] To further improve sealing performance, sealing rings 18 are embedded on the outer surfaces of both the main valve seat 14 and the auxiliary valve seat 16. The sealing rings 18 fit snugly against the inner wall of the valve body 1, achieving a seal between the main valve seat 14, the auxiliary valve seat 16, and the inner wall of the valve body 1, preventing leakage of hydraulic oil or the transported fluid. Simultaneously, sealing rings 17 are installed on the side of both the main valve seat 14 and the auxiliary valve seat 16 near the valve core 4. The sealing rings 17 fit snugly against the sealing surface of the valve core 4, further enhancing the sealing effect between the main and auxiliary valve seats and the valve core 4. Furthermore, the sealing... An adjusting seat 25 is slidably connected inside the cavity 19. Multiple adjusting bolts 26 are threaded onto the valve body 1 and are distributed equidistantly along the circumference. Each adjusting bolt 26 is perpendicular to the adjusting seat 25. The side of the adjusting seat 25 away from the sealing cavity 19 has an inclined structure. The bottom end of the adjusting bolt 26 has a mating surface that fits into the inclined structure. Rotating the adjusting bolt 26 can push the adjusting seat 25 to slide, thereby adjusting the size of the sealing cavity 19, realizing fine adjustment of the hydraulic oil pressure, and ensuring that the fitting force of the secondary valve seat 16 is precise and controllable. To facilitate the synchronous adjustment of multiple adjusting bolts 26, a driving component is provided on the valve body 1. The driving component includes a driven bevel gear 27 connected to the top of the adjusting bolt 26. A turntable 28 is rotatably mounted on the outer wall of the valve body 1. A driving bevel gear 29 is connected to one side of the turntable 28. The driving bevel gear 29 and the driven bevel gear 27 are meshed. Rotating the turntable 28 will drive the driven bevel gear 27 to rotate synchronously through the driving bevel gear 29, thereby realizing the synchronous adjustment of multiple adjusting bolts 26 and improving the adjustment efficiency and accuracy.

[0040] In summary, the entire device, through the coordinated operation of the actuator, hydraulic linkage mechanism, main and auxiliary valve seat assemblies, and auxiliary adjustment structure, achieves low-friction opening and closing of valve core 4, ensures sealing reliability through the dual sealing of the main and auxiliary valve seats, and optimizes the sealing force through the adjustment structure to adapt to different working conditions, effectively solving the technical defects of existing dual-seat electro-hydraulic ball valves.

[0041] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A low-friction electrically controlled ball valve with dual seats, comprising a valve body (1) and a valve core (4) rotatably disposed inside the valve body (1), characterized in that: The valve body (1) is further provided with a valve seat assembly for sealing the valve core (4). The valve seat assembly includes a main valve seat (14) and a secondary valve seat (16). The main valve seat (14) has a plurality of preload springs (15) evenly spaced along its circumference on the side away from the valve core (4). One end of the preload spring (15) is fixedly connected to the main valve seat (14), and the other end is fixedly connected to the inner wall of the valve body (1). The elastic force of the preload spring (15) presses the main valve seat (14) against the sealing surface of the valve core (4). The secondary valve seat (16) is coaxially slidably connected to the outer ring of the main valve seat (14), and the secondary valve seat (16) corresponds to the sealing surface of the valve core (4). The valve body (1) The valve core (4) is also equipped with a hydraulic linkage mechanism for driving the secondary valve seat (16) to slide axially. The hydraulic linkage mechanism is connected to the secondary valve seat (16) and the action of the hydraulic linkage mechanism is linked to the opening and closing action of the valve core (4). When the valve core (4) is in the process of opening or closing, the hydraulic linkage mechanism applies pressure to drive the secondary valve seat (16) to move away from the valve core (4), so that the sealing surface of the secondary valve seat (16) is separated from the sealing surface of the valve core (4). When the valve core (4) is opened or closed, the hydraulic linkage mechanism is depressurized, and the secondary valve seat (16) is pressed against the sealing surface of the valve core (4) under the reverse force of the hydraulic linkage mechanism.

2. The low-friction electrically controlled ball valve with dual seats as described in claim 1, characterized in that: The valve body (1) is also provided with an actuator for driving the valve core (4) to rotate. The actuator includes a valve cover (2) fixedly connected to the valve body (1). A valve stem (3) is rotatably connected inside the valve cover (2). The bottom end of the valve stem (3) is fixed to the outer wall of the valve core (4). An electric actuator (13) for driving the valve stem (3) to rotate is also installed on the top surface of the valve cover (2).

3. A low-friction electrically controlled ball valve with dual seats as described in claim 2, characterized in that: The hydraulic linkage mechanism includes a mounting box (5) installed on the valve cover (2), a piston cylinder (9) installed on the outer wall of the mounting box (5), a first piston plate (10) slidably installed inside the piston cylinder (9), an infusion pipe (12) connected to the piston cylinder (9), an annular oil injection channel (23) opened inside the valve body (1), and the other end of the infusion pipe (12) is connected to the annular oil injection channel (23); a sealing cavity (19) is also opened inside the valve body (1), and an oil injection hole (24) connecting the sealing cavity (19) and the annular oil injection channel (23) is opened inside the valve body (1). A second piston plate (20) slidably installed inside the sealing cavity (19), a second piston rod (21) connected to one side of the second piston plate (20), and the other end of the second piston rod (21) is fixedly connected to the auxiliary valve seat (16).

4. A low-friction electrically controlled ball valve with dual seats as described in claim 3, characterized in that: The mounting box (5) has a sliding limit plate (6) inside. The bottom surface of the limit plate (6) is rotatably connected to an adjusting nut (7). The adjusting nut (7) is threaded onto the valve stem (3). One side of the first piston plate (10) is connected to a first piston rod (11). One end of the first piston rod (11) away from the first piston plate (10) extends to the mounting box (5) and is hinged to a connecting rod (8). The other end of the connecting rod (8) is hinged to the adjusting nut (7).

5. A low-friction electrically controlled ball valve with dual seats as described in claim 3, characterized in that: A return spring (22) is also fitted on the second piston rod (21). One end of the return spring (22) is connected to the second piston plate (20), and the other end is connected to the inner wall of the sealing cavity (19). Under the elastic force of the return spring (22), the auxiliary valve seat (16) is pulled away from the sealing surface of the valve core (4).

6. A low-friction electrically controlled ball valve with dual seats as described in claim 4, characterized in that: An adjusting seat (25) is slidably disposed inside the sealing cavity (19). The adjusting seat (25) moves to change the cavity volume of the sealing cavity (19). Multiple adjusting bolts (26) are threadedly connected to the valve body (1). The multiple adjusting bolts (26) are equidistantly distributed along the circumference of the valve body (1). Each adjusting bolt (26) is perpendicular to the adjusting seat (25). The side of the adjusting seat (25) away from the sealing cavity (19) is a slope structure. The bottom end of the adjusting bolt (26) is provided with a mating surface that fits into the slope structure.

7. A low-friction electrically controlled ball valve with dual seats as described in claim 6, characterized in that: The valve body (1) is also provided with a drive component that drives all the adjusting bolts (26) to rotate synchronously. The drive component includes a driven bevel gear (27) connected to the top of the adjusting bolt (26). A turntable (28) is rotatably mounted on the outer wall of the valve body (1). A drive bevel gear (29) is connected to one side of the turntable (28). The drive bevel gear (29) meshes with the driven bevel gear (27).

8. A low-friction electrically controlled ball valve with dual seats as described in claim 1, characterized in that: Both the main valve seat (14) and the auxiliary valve seat (16) have a sealing ring (18) embedded on their outer surfaces. The sealing ring (18) fits against the inner wall of the valve body (1). The main valve seat (14) and the auxiliary valve seat (16) are sealed to the inner wall of the valve body (1) by the sealing ring (18).

9. A low-friction electrically controlled ball valve with dual seats as described in claim 1, characterized in that: Both the main valve seat (14) and the auxiliary valve seat (16) are equipped with sealing rings (17) on the side near the valve core (4), and the sealing rings (17) are in contact with the sealing surface of the valve core (4).

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