A sealed isolating balanced cock valve

Abstract

The application belongs to the technical field of plug valves, and specifically relates to a sealed isolation type balanced plug valve, which comprises a valve body, a balance cavity is formed in the valve body, and further comprises: a valve core which is rotationally connected to the inside of the balance cavity, the valve core is in a conical structure with a wide upper part and a narrow lower part, and a through hole is formed in the inside of the valve core; a driving part which is fixedly connected to the top of the valve core and is used for driving the valve core to move up and down or rotate in the balance cavity; and a valve seat part which is fixedly connected to the inner walls on both sides of the balance cavity and comprises a seat body, the end of the seat body is in abutment with the side wall of the valve core, when the driving part drives the valve core to move downwards along the balance cavity, the extrusion force between the valve core and the seat body is increased and drives the seat bodies on both sides to move away from each other, the plug valve can accurately adjust the sealing specific pressure, can resist the radial force received by the valve core, can improve the accuracy of the sealing specific pressure adjustment, can comprehensively realize flushing and cleaning, and can avoid the reduction of the subsequent rotation and movement accuracy caused by the adhesion of media.

Description

Technical Field

[0001] This invention belongs to the field of plug valve technology, specifically a sealed and isolated balanced plug valve. Background Technology

[0002] A plug valve is a type of valve that opens and closes by rotating a valve core with a through hole. It has advantages such as simple structure, smooth flow path, low fluid resistance, rapid opening and closing, and no dead angle. It is widely used in industrial fluid transportation systems. Especially in the field of sanitary fluid transportation, the plug valve has become the preferred product to replace ball valves and diaphragm valves due to its straight flow path and easy cleaning characteristics.

[0003] Chinese invention patent application CN116518104A discloses a plug valve, including a valve body and an upper valve seat, a valve ball, a lower valve seat and a valve ball opening mechanism disposed in the valve body. The valve ball is sandwiched between the upper valve seat and the lower valve seat. The lower valve seat includes a first lower valve seat and a second lower valve seat. The first lower valve seat is connected to the valve body and the second lower valve seat is sleeved on the first lower valve seat.

[0004] Chinese invention patent application CN119844596A discloses a stopcock valve, which belongs to the field of kitchen appliance technology. The stopcock valve includes a valve body, a valve core, a valve stem, and a delay mechanism. The valve body includes a valve body body, an outer ring air outlet component and an inner ring air outlet component. The valve core includes a valve core cavity and an outer ring air outlet hole, an air inlet hole and an inner ring air outlet hole arranged from top to bottom.

[0005] The aforementioned plug valves, when closed, cannot adaptively adjust the sealing pressure ratio between the valve core and the valve seat. Furthermore, the medium inside the inlet pipe continuously applies radial force to the outer surface of the valve core, causing relative displacement of the valve core. This not only results in the compression deformation of the valve core but also causes the valve core to continuously apply different compression forces to the valve seats on both sides, thus affecting the accuracy of the sealing pressure adjustment. In addition, during the rotation of the valve core, some medium inevitably enters the balance chamber. At this time, some impurities adhere to the inner wall of the balance chamber and the outer surface of the valve core, affecting the normal flow of subsequent medium. In particular, if some impurities adhere to the lower valve stem and lower shaft hole, it will further increase the frictional resistance between them, thereby increasing the difficulty of subsequent adjustment. Summary of the Invention

[0006] To address the above problems, this invention provides a sealed and isolated balanced plug valve.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a sealed and isolated balanced plug valve, comprising a valve body, wherein a balanced chamber is provided inside the valve body, and further comprising: The valve core is rotatably connected inside the balance chamber. The valve core has a conical structure that is wider at the top and narrower at the bottom, and a through hole is opened inside the valve core. The drive unit is fixedly connected to the top of the valve core and is used to drive the valve core to move up and down or rotate inside the balance chamber. The valve seat is fixedly connected to the inner walls of both sides of the balance chamber. It includes a seat body, the end of which is in contact with the side wall of the valve core. When the drive unit moves the valve core downward along the balance chamber, the squeezing force between the valve core and the seat body increases and causes the two seats to move away from each other.

[0008] Preferably, a valve cover is bolted to the top of the valve body, and an installation hole is provided inside the valve cover. A sealing ring is fixedly installed on the inner wall below the installation hole. A lower valve stem is fixedly connected to the bottom axis of the balance chamber. Multiple limiting components are evenly fixedly connected to the top of the lower valve stem. A lower shaft hole is provided at the bottom axis of the valve core. The lower valve stem and the limiting components are inserted into and rotatably connected to the lower shaft hole.

[0009] Preferably, the drive unit includes: The mounting component is fixedly connected to the top of the valve core and is used to drive the valve core to rotate and move up and down. The drive shaft is rotatably connected inside the mounting hole, and the bottom of the drive shaft is fixedly connected to the top of the mounting part through a telescopic component. The outer surface of the telescopic component is movably connected to the inner wall of the sealing ring. The top of the drive shaft is fixedly connected to the output end of the drive motor. The drive shaft drives the valve core to rotate through the telescopic component and the mounting part, and the telescopic component drives the valve core to move up and down through the mounting part.

[0010] Preferably, one side of the valve body is connected to an inlet pipe, the output end of which is connected to the inside of the balance chamber, and the other side of the valve body is connected to an outlet pipe, the input end of which is connected to the inside of the balance chamber. Flanges are fixedly connected to the outer surfaces of both the inlet and outlet pipes. The medium enters the balance chamber and the through hole along the inlet pipe and is discharged along the outlet pipe.

[0011] Preferably, the valve seat portion includes: The inner ring is symmetrically arranged on both sides of the balance chamber. The inner ring is located outside the inlet pipe and the outlet pipe, and the inner diameter of the inner ring is greater than the inner diameter of the inlet pipe and the outlet pipe. The outer ring is symmetrically arranged on both sides of the balance cavity. The outer ring is located outside the inner ring and the inner diameter of the outer ring is greater than that of the inner ring. The disc spring is located between the inner and outer rings, with one end of the disc spring fitting against the inner wall of the balance chamber and the other end fitting against the side wall of the seat away from the valve core. The disc spring is elastic and applies elastic support force to the seat.

[0012] Preferably, the valve seat portion further includes: The flow holes are evenly distributed inside the inner ring near the inlet pipe, and one side of the flow holes is connected to the inside of the inlet pipe, allowing the medium inside the inlet pipe to flow along the flow holes. The discharge holes are evenly distributed inside the seat, with one end corresponding to the flow hole and the other end corresponding to the inside of the balance chamber. When the discharge hole coincides with the flow hole, the medium inside the inlet pipe can enter the balance chamber along the flow hole and the discharge hole. The discharge holes are inclined and offset from the outer ring.

[0013] Preferably, the height of the balance chamber is greater than the height of the valve core, and the height difference between the balance chamber, the valve core, and the mounting component is greater than the height of the lower valve stem but less than the sum of the heights of the lower valve stem and the limiting component. When the mounting component drives the valve core to move upward along the balance chamber to the maximum distance, the lower shaft hole disengages from the lower valve stem and remains engaged with the limiting component.

[0014] Preferably, the inner diameter of the through hole is smaller than the inner diameter of the inner ring, and the width of the through hole is smaller than the distance between the two ends of the outer rings. The distance between the inner ring and the outer ring is the same as the width of the seat, and the sidewalls of the inner ring and the outer ring are in a sealed sliding connection with the outer surface of the seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, by setting up the mutual cooperation of components such as valve core and valve seat, there is a gap between the balance chamber and the valve core. The valve seat elastically compresses the valve core sidewall to achieve sealing. The valve core itself has a conical structure that is wider at the top and narrower at the bottom, which corresponds to the adjustment of the elastic compressive force with the valve seat, thereby adjusting the sealing pressure between the valve seat and the valve core to meet different sealing requirements.

[0016] 2. In this invention, by setting up components such as flow holes and discharge holes in cooperation, when the valve is closed, the valve core moves downward a certain distance and squeezes the seat to move away from each other. The medium inside the inlet pipe enters the balance chamber along the flow holes and discharge holes and applies force to the outer surface of the valve core, thereby effectively resisting the radial force on the side wall of the valve core and improving the stability of the valve core.

[0017] 3. In this invention, by setting up through holes and seat body and other components to cooperate with each other, after long-term use, cleaning fluid is introduced into the inlet pipe. At the same time, the valve core rotates a certain angle and moves downward. The flow hole and the discharge hole overlap and continuously pulse-spray cleaning fluid into the balance chamber, thereby achieving the flushing and cleaning effect on the inner wall of the balance chamber and the outer surface of the valve core.

[0018] 4. In this invention, by setting up the cooperation of components such as the lower valve stem and the lower shaft hole, the valve core can rotate and move up and down with the lower valve stem through the lower shaft hole. During the flushing and cleaning process, the valve core moves upward to the maximum distance, and the cleaning liquid inside the inlet pipe is pulsedly sprayed out along the outlet hole to flush and clean the outer surface of the lower valve stem and the inner surface of the lower shaft hole. Attached Figure Description

[0019] Figure 1 This is a frontal three-dimensional structural diagram of the present invention; Figure 2 This is a frontal view of the internal three-dimensional structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a top-view three-dimensional structural diagram of the present invention; Figure 5 This is a three-dimensional exploded view of the drive unit, valve core, and lower valve stem of the present invention. Figure 6 This is a three-dimensional structural diagram of the valve seat portion of the present invention; Figure 7 This is a top-view cross-sectional view of the valve in the open state of the present invention; Figure 8 This is a top-view cross-sectional view of the valve in the closed state of the present invention; Figure 9 This is a top cross-sectional view of the cleaning state of the present invention.

[0020] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve core; 4. Drive unit; 401. Drive shaft; 402. Telescopic component; 403. Mounting component; 5. Valve seat; 501. Inner ring; 502. Outer ring; 503. Disc spring; 504. Seat; 505. Flow hole; 506. Discharge hole; 6. Inlet pipe; 7. Outlet pipe; 8. Flange; 9. Through hole; 10. Balance chamber; 11. Lower valve stem; 12. Lower shaft hole; 13. Mounting hole; 14. Sealing ring; 15. Limiting component. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0022] In existing plug valves, the inner wall of the valve body 1 and the outer surface of the valve core 3 are tightly fitted during rotation, making it difficult and inaccurate for the valve core 3 to rotate. When the valve core 3 rotates inside the valve body 1 and reaches the opening and closing positions, the rotational resistance between the valve core 3 and the valve seat 5 increases instantaneously, reducing the subsequent rotation effect. Furthermore, when the plug valve is in the closed state, the sealing pressure between the valve core 3 and the valve seat 5 cannot be adaptively adjusted. Especially after prolonged use, wear occurs between the outer surface of the valve core 3 and the end of the valve seat 5, making it impossible to adaptively adjust the squeezing pressure, thus affecting the normal flow and discharge of the subsequent medium.

[0023] like Figures 1 to 9As shown, a sealed and isolated balanced plug valve includes a valve body 1 with a balanced chamber 10 inside. A medium flows inside the balanced chamber 10. The valve body 1 also includes a valve core 3, rotatably connected to the balanced chamber 10. The valve core 3 has a conical structure, wider at the top and narrower at the bottom. The valve core 3 rotates within the balanced chamber 10 to control the flow of the medium. A gap exists between the valve core 3 and the balanced chamber 10, facilitating the rotation and vertical movement of the valve core 3 within the balanced chamber 10. A through hole 9 is provided inside the valve core 3 for the flow of the medium. A drive unit 4 is fixedly connected to the top of the valve core 3, used to drive the valve core 3 to move vertically or rotate within the balanced chamber 10. The drive unit 4 acts as a driving source to change the working state of the valve core 3 within the balanced chamber 10. In particular, the drive unit 4 can be electrically driven to meet current automation requirements.

[0024] The valve seat 5 is fixedly connected to the inner walls of both sides of the balance chamber 10. The valve seat 5 cooperates with the movement of the valve core 3 to realize the opening and closing of the flow medium and the subsequent flushing process. The valve seat 5 includes a seat body 504. The end of the seat body 504 is in contact with the side wall of the valve core 3, thereby realizing the sealing protection of the valve core 3. When the drive unit 4 drives the valve core 3 to move downward along the balance chamber 10, the compressive force between the valve core 3 and the seat body 504 increases and drives the two seats 504 to move away from each other. At this time, the valve core 3 itself has a conical structure that is wider at the top and narrower at the bottom, which increases the compressive force between the valve core 3 and the seat body 504, and increases the sealing pressure between them accordingly.

[0025] A valve cover 2 is bolted to the top of the valve body 1. The valve cover 2 facilitates maintenance and replacement of the internal structure of the balance chamber 10. An installation hole 13 is provided inside the valve cover 2 for mounting and fixing the drive unit 4. A sealing ring 14 is fixedly installed on the lower inner wall of the installation hole 13, sealing the area below the installation hole 13 and ensuring the sealing stability of the balance chamber 10. This prevents the medium from flowing out along the installation hole 13. For long-term use, the sealing ring 14 can be replaced with a sealing ring inside the installation hole 13. The sealing ring 14 ensures the sealing effect. The lower valve stem 11 is fixedly connected to the bottom axis of the balance chamber 10. Multiple limiting parts 15 are evenly fixedly connected to the top of the lower valve stem 11. The gap between two adjacent limiting parts 15 is used for the flow of cleaning fluid. The position of the lower valve stem 11 is fixed. The bottom axis of the valve core 3 is provided with a lower shaft hole 12. The lower valve stem 11 and the limiting parts 15 are inserted into and rotated in the lower shaft hole 12. Therefore, the valve core 3 achieves rotation and up and down movement by means of the insertion of the lower shaft hole 12 and the lower valve stem 11, thereby improving the accuracy of movement.

[0026] The drive unit 4 includes: a mounting member 403, which is fixedly connected to the top of the valve core 3 and is used to drive the valve core 3 to rotate and move up and down. The mounting member 403 is fixed to the top of the valve core 3 and realizes the adjustment of the position of the valve core 3. It mainly plays a connecting and fixing role; a transmission shaft 401, which is rotatably connected to the inside of the mounting hole 13. The bottom of the transmission shaft 401 is fixedly connected to the top of the mounting member 403 through the telescopic member 402. The outer surface of the telescopic member 402 is sealed and movably connected to the inner wall of the sealing ring 14. The transmission shaft 401 provides rotational driving force, while the telescopic member 402 provides driving force for up and down movement. The top of the transmission shaft 401 is fixedly connected to the output end of the drive motor. Therefore, when the drive motor is working, it drives the transmission shaft 401 to rotate to a precise angle. The transmission shaft 401 drives the valve core 3 to rotate through the telescopic member 402 and the mounting member 403. The telescopic member 402 drives the valve core 3 to move up and down through the mounting member 403, further realizing the rotation and up and down movement of the valve core 3 inside the balance chamber 10.

[0027] One side of the valve body 1 is connected to an inlet pipe 6, and the output end of the inlet pipe 6 is connected to the inside of the balance chamber 10. The medium enters the inside of the balance chamber 10 along the inlet pipe 6. When the valve is open, the medium reaches the inside of the through hole 9 for flow. The other side of the valve body 1 is connected to an outlet pipe 7, and the input end of the outlet pipe 7 is connected to the inside of the balance chamber 10. That is, when the valve is open, the medium inside the through hole 9 is discharged along the outlet pipe 7. The outer surfaces of the inlet pipe 6 and the outlet pipe 7 are fixedly connected to flanges 8. The flanges 8 improve the installation stability of the plug valve. The medium enters the inside of the balance chamber 10 along the inlet pipe 6 and is discharged along the outlet pipe 7, thereby realizing the flow and discharge of the medium.

[0028] The valve seat 5 includes: an inner ring 501, symmetrically arranged on both sides of the balance chamber 10. The inner ring 501 is fixed in position and cooperates with the outer ring 502 to limit the sliding of the seat body 504, preventing the seat body 504 from shifting due to the pressure of the valve core 3. The inner ring 501 is located outside the inlet pipe 6 and the outlet pipe 7, and the inner diameter of the inner ring 501 is greater than the inner diameter of the inlet pipe 6 and the outlet pipe 7. Therefore, the inner ring 501, in conjunction with the seat body 504, can elastically press the outer surface of the valve core 3, preventing the medium from entering the balance chamber 10 for a long time and affecting its pressure stability; and an outer ring 502, symmetrically arranged on both sides of the balance chamber 10. The outer ring 502 is located outside the inner ring 501, and the inner diameter of the outer ring 502 is greater than the inner diameter of the inner ring 501. The outer ring 502 limits and engages with the outer wall of the seat body 504, and the inner ring 501... The shapes of the inner ring 501 and the outer ring 502 correspond to those of the seat 504, effectively preventing the seat 504 from sliding out between them and causing separation. The disc spring 503 is located between the inner ring 501 and the outer ring 502, with one end of the disc spring 503 in contact with the inner wall of the balance chamber 10 and the other end in contact with the side wall of the seat 504 away from the valve core 3. The disc spring 503 is elastic and applies an elastic support force to the seat 504. The disc spring 503 applies an elastic support force to the seat 504, thereby ensuring the elastic contact between the seat 504 and the outer surface of the valve core 3. When the valve core 3 moves upward to the maximum distance, the seat 504 remains in contact with the outer surface of the valve core 3 under the elastic force of the disc spring 503 and does not separate from the inner ring 501 and the outer ring 502, thereby effectively avoiding separation loss and reducing the sealing effect.

[0029] The height of the balance chamber 10 is greater than the height of the valve core 3. Therefore, the valve core 3 can rotate and move up and down inside the balance chamber 10, thereby adjusting the sealing pressure. The height difference between the balance chamber 10, the valve core 3, and the mounting part 403 is greater than the height of the lower valve stem 11 and less than the sum of the heights of the lower valve stem 11 and the limiting part 15. That is, when the mounting part 403 drives the valve core 3 to move upward along the balance chamber 10 to the maximum distance, the lower valve stem 11 disengages from the lower shaft hole 12 and remains engaged with the limiting part 15. This allows for flushing and cleaning of the outer surface of the lower valve stem 11 and the inside of the lower shaft hole 12. Furthermore, the limiting part 15 effectively prevents the lower valve stem 11 from disengaging from the lower shaft hole 12 and causing the valve core 3 to shift inside the balance chamber 10.

[0030] The inner diameter of the through hole 9 is smaller than that of the inner ring 501. Therefore, the medium inside the inlet pipe 6 flows directly into the through hole 9 after passing through the inner ring 501. The width of the through hole 9 is smaller than the distance between the two ends of the outer rings 502. When the valve core 3 rotates 90 degrees to close the valve, the through hole 9 is located between the two outer rings 502. The medium inside the inlet pipe 6 will not continuously enter the through hole 9 and cause leakage. The distance between the inner ring 501 and the outer ring 502 is the same as the width of the seat 504. The side walls of the inner ring 501 and the outer ring 502 are sealed and slidably connected to the outer surface of the seat 504. This setting further realizes the sliding stability of the seat 504 and prevents it from eccentrically separating.

[0031] When in use, first install all the components of the plug valve as required. The valve core 3 is fixed to the lower valve stem 11 and the limiting member 15 by means of the lower shaft hole 12 at the bottom. At the same time, the sealing ring 14 seals and engages the telescopic member 402 and the mounting hole 13. The valve core 3 is located inside the balance chamber 10. Under the elastic force of the disc spring 503, the seat 504 moves along the inner ring 501 and the outer ring 502 towards the end closer to the valve core 3 and fits against the outer surface of the valve core 3, thereby achieving a seal inside the balance chamber 10 and preventing unnecessary contamination caused by the medium entering the balance chamber 10 during flow.

[0032] When the stopcock needs to be opened, the drive motor starts and drives the transmission shaft 401 to rotate forward. The transmission shaft 401 drives the valve core 3 to rotate forward 90 degrees through the telescopic part 402 and the mounting part 403 below. At this time, the two sides of the through hole 9 inside the valve core 3 are connected to the inlet pipe 6 and the outlet pipe 7 respectively. The outer surface of the valve core 3 and the end of the seat 504 are pressed against each other and drive the seat 504 to press the disc spring 503 to move away from each other. Under the elastic force of the disc spring 503, the end of the seat 504 is tightly fitted with the outer surface of the valve core 3, which prevents the medium inside the inlet pipe 6 from entering the balance chamber 10 and causing contamination. The medium inside the inlet pipe 6 enters the through hole 9 and is further discharged along the outlet pipe 7, thereby achieving sealed flow of the medium and preventing the medium from entering the balance chamber 10 and affecting its flow stability.

[0033] When the stopcock valve needs to be closed, the drive motor starts and drives the transmission shaft 401 to reverse. The transmission shaft 401 drives the valve core 3 to reverse 90 degrees and close the valve through the lower telescopic member 402 and the mounting member 403. Before closing the valve, the telescopic member 402 starts and the output end shortens. The output end of the telescopic member 402 drives the valve core 3 to move upward through the mounting member 403. The lower shaft hole 12 below the valve core 3 is still connected to the lower valve stem 11 and the limiting member 15. The height of the seat 504 remains unchanged due to the valve core 3's conical structure, which is wider at the top and narrower at the bottom. This increases the distance between the valve core 3 and the inner ring 501 and outer ring 502 on the same horizontal plane. Under the elastic force of the disc spring 503, the seat 504 moves towards each other. The deformation of the disc spring 503 decreases and the elastic force applied to the seat 504 decreases. The squeezing force applied by the end of the seat 504 to the outer surface of the valve core 3 decreases. Therefore, the squeezing force on the valve core 3 by the seat 504 at the moment of valve closing is reduced, which avoids excessive squeezing force between the seat 504 and the valve core 3 and affects its closing torque, effectively improving the stability and efficiency of the switching valve.

[0034] As the valve core 3 rotates continuously, some of the medium inside the inlet pipe 6 enters the balance chamber 10 through the through hole 9 and is eventually discharged through the outlet pipe 7 at the other end. When the valve core 3 rotates to 90 degrees, the through hole 9 is misaligned with the inlet pipe 6 and the outlet pipe 7. The valve core 3 blocks and closes the inlet pipe 6 and the outlet pipe 7. At the same time, the telescopic component 402 is activated and its output end extends. The output end of the telescopic component 402 drives the valve core 3 to move downward through the mounting component 403. During the downward movement of the valve core 3, the pressure exerted on the seat 504 by its own conical structure (wider at the top and narrower at the bottom) continuously increases. The seat 504 compresses the disc spring 503 and moves it away from each other. The elastic deformation of the disc spring 503 continuously increases and increases the elastic compressive force exerted by the seat 504 on the valve core 3, further realizing the compression seal between the seat 504 and the valve core 3.

[0035] Simultaneously, based on actual usage requirements, when it is necessary to increase the sealing pressure between the seat 504 and the valve core 3, the extension distance of the output end of the telescopic component 402 increases, causing the valve core 3 to move downwards by a correspondingly larger distance. Consequently, the compressive force between the valve core 3 and the seat 504 increases, the seat 504 compresses the disc spring 503 and moves further away from it, the elastic deformation of the disc spring 503 increases, and the elastic compressive force applied to the seat 504 increases accordingly. The compressive force applied by the seat 504 to the valve core 3 increases, and the sealing pressure between the seat 504 and the valve core 3 increases accordingly, thereby improving the sealing performance under valve-closed conditions. This allows for adaptive adjustment of the sealing pressure between the seat 504 and the valve core 3, meeting different sealing requirements.

[0036] When the valve needs to be opened, the telescopic component 402 is activated and the output end is shortened. The telescopic component 402 then moves the valve core 3 upward, reducing the pressure between the valve core 3 and the seat 504. Under the elastic force of the disc spring 503, the seat 504 moves closer to each other, reducing the elastic deformation of the disc spring 503 and the corresponding elastic pressure applied to the seat 504. This reduces the pressure between the seat 504 and the valve core 3, effectively reducing the pressure on the valve core 3 during the valve opening process. Then, the drive motor drives the transmission shaft 401 to rotate forward. The transmission shaft 401, through the telescopic component 402 and the mounting component 403, drives the valve core 3 to rotate forward to 90 degrees, thus completing the valve opening process. The above process can then be repeated.

[0037] Furthermore, with prolonged use of the plug valve, if the outer surface of the valve core 3 or the end of the seat 504 wears down and affects its sealing effect, the output end of the telescopic component 402 extends and causes the valve core 3 to move downward a greater distance when the end of the seat 504 and the outer surface of the valve core 3 are in contact and working together. At this time, the downward movement of the valve core 3 and the pressure between it and the seat 504 increase, causing the disc spring 503 to move further away from each other. Correspondingly, the elastic force applied by the disc spring 503 to the seat 504 increases, and the pressure between the end of the seat 504 and the outer surface of the valve core 3 increases, thereby improving the sealing effect. In actual use, a corrosion-resistant elastic material can be set at the end of the seat 504 to improve its elastic sealing effect with the outer surface of the valve core 3, thereby improving the durability and controllability of the plug valve and preventing wear on the valve core 3 or the outer surface of the seat 504 from affecting its normal sealing effect. Example 2

[0038] When the aforementioned plug valve is closed, the through hole 9 is misaligned with the inlet pipe 6 and the outlet pipe 7, and the outer surface of the valve core 3 is pressed against the end of the seat 504. As a result, the medium inside the inlet pipe 6 continuously applies radial force to the outer surface of the valve core 3, causing the valve core 3 to shift relative to the outside. This not only easily causes the valve core 3 to deform under pressure, but also causes the valve core 3 to continuously apply different pressures to the disc springs 503 on both sides and the seat 504, thus affecting its own elasticity and the accuracy of the subsequent adjustment of the sealing pressure between the valve core 3 and the seat 504. Furthermore, during the rotation of the valve core 3, some medium inevitably enters the balance chamber 10. At this time, some impurities adhere to the inner wall of the balance chamber 10 and the outer surface of the valve core 3, affecting the normal flow of the medium. In particular, if some impurities adhere to the lower valve stem 11 and the lower shaft hole 12, the resistance between them will be further increased, thus increasing the difficulty of subsequent adjustment.

[0039] To address the aforementioned issues, the valve seat 5 further includes: a flow hole 505, which is uniformly distributed within the inner ring 501 near the inlet pipe 6, and one side of the flow hole 505 is connected to the inside of the inlet pipe 6, allowing the medium inside the inlet pipe 6 to flow along the flow hole 505. This facilitates the filling balance within the balance chamber 10 and subsequent flushing and cleaning; and a discharge hole 506, which is uniformly distributed within the seat body 504, with one end corresponding to the flow hole 505. The other end corresponds to the inside of the balance chamber 10. The medium or cleaning fluid inside the flow hole 505 can be discharged into the balance chamber 10 along the discharge hole 506. When the discharge hole 506 coincides with the flow hole 505, the medium inside the liquid inlet pipe 6 can enter the balance chamber 10 along the flow hole 505 and the discharge hole 506. The discharge hole 506 is inclined and misaligned with the outer ring 502. Therefore, the outer ring 502 will not block the discharge hole 506 during the movement of the seat 504, effectively preventing the flow and discharge of the medium or cleaning fluid from being affected.

[0040] When in use, when the plug valve needs to be closed, the drive shaft 401 reverses by a certain angle through the telescopic member 402 and the mounting member 403, causing the through hole 9 to be misaligned with the inlet pipe 6 and the outlet pipe 7. At this time, the side wall of the valve core 3 and the seat 504 are squeezed and sealed against each other. The medium inside the inlet pipe 6 is blocked by the valve core 3 and cannot continue to flow backward. Therefore, the medium inside the inlet pipe 6 will exert a radial force on the side wall of the valve core 3 and cause it to shift. Consequently, the squeezing force applied to the seat 504 on both sides changes accordingly and affects its normal squeezing and sealing effect.

[0041] At this time, the telescopic component 402 is activated and its output end extends. The extension of the output end of the telescopic component 402 drives the valve core 3 to move downward. The downward movement of the valve core 3 increases the squeezing force on the seat 504. The seat 504 simultaneously squeezes the disc spring 503 and moves away from each other. The discharge hole 506 inside the seat 504 on the side of the inlet pipe 6 moves synchronously and continuously overlaps with the flow hole 505. However, the inner ring 501 on the side of the outlet pipe 7 does not have a flow hole 505. Therefore, the discharge hole 506 on the side of the outlet pipe 7 will not flow to the outlet pipe 7 to discharge the medium. Some of the medium inside the inlet pipe 6 is continuously discharged into the balance chamber 10 along the flow hole 505 and the discharge hole 506. The medium inside the balance chamber 10 continuously flows and fills a certain amount. At this time, with the help of the all-round support applied to the valve core 3 by the medium, the valve core 3 effectively resists the radial force in the direction of the inlet pipe 6, and improves the stability and safety of the valve core 3 inside the balance chamber 10.

[0042] In particular, after the valve is closed, the sealing pressure between the seat 504 and the valve core 3 needs to be adjusted. Since the height of the balance chamber 10 is greater than the inner diameter of the inlet pipe 6 and the outlet pipe 7, the medium inside the balance chamber 10 cannot be completely filled. A certain gap must be left. This gap not only avoids changes in the expansion of the medium under different temperature changes, but also avoids excessive resistance that could affect the subsequent valve opening effect. Furthermore, by adjusting the filling amount of the medium inside the balance chamber 10 according to the medium inside the inlet pipe 6, the force on the outer surface of the valve core 3 becomes uniform and stable. Correspondingly, the compressive force between the valve core 3 and the seat 504 becomes uniform and stable. This satisfies the need for subsequent adjustment of the height of the valve core 3 and the corresponding adjustment of the sealing pressure between the valve core 3 and the seat 504. This avoids problems such as poor accuracy and disordered force when adjusting the sealing pressure under uneven force conditions between the valve core 3 and the seat 504, effectively reducing the fluctuation of the sealing pressure, extending the sealing life, and thus meeting the radial resistance requirements of different media. This results in stronger adaptability and more precise control.

[0043] During the filling process of the balance chamber 10, some media will inevitably remain inside the balance chamber 10 and on the outer surface of the valve core 3. Therefore, when the plug valve needs to be flushed and cleaned after long-term use, cleaning fluid is first introduced into the inlet pipe 6. The cleaning fluid flows out through the through hole 9 to the outlet pipe 7, thereby flushing and cleaning the pipeline. Then, the drive shaft 401 rotates at a certain angle. The drive shaft 401 drives the valve core 3 to rotate at a certain angle inside the balance chamber 10 through the telescopic member 402 and the mounting member 403. At this time, the through hole 9 and the balance chamber 10 partially overlap. The cleaning fluid inside the inlet pipe 6 continuously enters the balance chamber 10 through the through hole 9 to flush and clean, thereby avoiding the impact of residual media on the inner wall of the balance chamber 10 and the outer surface of the valve core 3 on subsequent normal flow.

[0044] However, the flow range of the cleaning fluid is limited and the flow speed is slow in the above process, making it unable to flush and clean the attached media. Therefore, the telescopic component 402 is activated and drives the valve core 3 to move downward through the mounting component 403. The valve core 3 moves downward and increases the squeezing force applied to the seat 504. The other end of the seat 504 simultaneously squeezes the disc spring 503 and moves away from each other. The seat 504 drives the internal discharge hole 506 to move synchronously. The discharge hole 506 gradually overlaps with the flow hole 505 inside the inner ring 501 on one side of the inlet pipe 6. The cleaning fluid inside the inlet pipe 6 is sprayed out under high pressure along the flow hole 505 and the discharge hole 506, thereby achieving a high-pressure flushing effect on the inner wall of the balance chamber 10 and the outer surface of the valve core 3. Since the inner ring 501 on one side of the outlet pipe 7 does not have a flow hole 505, the cleaning fluid sprayed into the balance chamber 10 by the discharge hole 506 eventually flows continuously along the through hole 9 and is discharged to the outlet pipe 7, thereby achieving the effect of flowing flushing and cleaning of the cleaning fluid.

[0045] Simultaneously, the output end of the telescopic component 402 drives the valve core 3 to move up and down reciprocally via the mounting component 403. The corresponding valve core 3 drives the seat 504 to move reciprocally within the inner ring 501 and outer ring 502. The overlapping area of ​​the discharge hole 506 and the flow hole 505 inside the seat 504 continuously changes. The amount of cleaning fluid discharged from the inlet pipe 6 along the flow hole 505 and discharge hole 506 continuously changes. Furthermore, in conjunction with the up and down movement of the valve core 3 and the change in the position of the discharge hole 506 driven by the seat 504, as well as the change in the rotation angle of the valve core 3 driven by the transmission shaft 401 through the telescopic component 402 and the mounting component 403, the flushing position and flushing quantity of the cleaning fluid discharged from the discharge hole 506 change accordingly. This further achieves the pulse flushing cleaning effect on the inner wall of the balance chamber 10 and the outer surface of the valve core 3, avoiding the medium from remaining for a long time and affecting the subsequent rotation and up and down movement of the valve core 3.

[0046] After flushing and cleaning the inner wall of the balance chamber 10 and the outer surface of the valve core 3, some medium will still remain on the outer surface of the lower valve stem 11 and inside the lower shaft hole 12, thus affecting the normal rotation and vertical movement of the valve core 3. Therefore, the drive shaft 401 first drives the valve core 3 to reverse 90 degrees through the telescopic component 402 and the mounting component 403, causing the through hole 9 to be misaligned and blocked with the inlet pipe 6 and the outlet pipe 7. Then the inlet pipe 6 and the outlet pipe 7 are blocked by the side wall of the valve core 3. At this time, the cleaning fluid inside the inlet pipe 6 cannot enter the through hole 9 to flow out. After that, the telescopic component 402 outputs... The end extends and moves the valve core 3 downward through the mounting part 403. The valve core 3 squeezes the seat 504 and causes it to squeeze the disc spring 503 to move away from each other. The seat 504 drives the discharge hole 506 to move and connect it with the flow hole 505. Then the cleaning fluid inside the inlet pipe 6 enters the balance chamber 10 along the flow hole 505 and the discharge hole 506 to fill it. This avoids the radial force on the valve core 3 being too large and affecting its movement stability when the telescopic part 402 adjusts the height of the valve core 3 inside the balance chamber 10 through the mounting part 403.

[0047] When the cleaning fluid inside the balance chamber 10 is filled to a certain amount, the force on the valve core 3 is uniform, and the output end of the telescopic component 402 shortens to its maximum value. The output end of the telescopic component 402 drives the valve core 3 to move upward along the inside of the balance chamber 10 to the maximum distance through the mounting component 403. The valve core 3 drives the lower shaft hole 12 below to move upward to the maximum distance and separate from the lower valve stem 11. However, the inner wall of the lower shaft hole 12 still remains in contact with the outer surface of the limiting component 15. The cleaning fluid is used to flow between two adjacent limiting components 15. The cleaning fluid inside the balance chamber 10 can flush the lower valve stem 11 and enter the lower shaft hole 12 between two adjacent limiting components 15 for flushing, further realizing the wrapping and soaking cleaning of the lower valve stem 11 and the lower shaft hole 12.

[0048] Simultaneously, as the valve core 3 moves upward to its maximum value, the pressure exerted by the valve core 3 on the seat 504 continuously decreases. Under its own elastic force, the disc spring 503 drives the seat 504 to move closer together. Both sides of the seat 504 cause the discharge hole 506 to disengage from the position between the inner ring 501 and the outer ring 502. The inner ring 501 no longer blocks the discharge hole 506, while the seat 504 remains between the inner ring 501 and the outer ring 502 and blocks the flow hole 505. Therefore, the cleaning fluid inside the inlet pipe 6 directly enters the balance chamber along the discharge hole 506. Inside the balance chamber 10, the cleaning fluid inside the balance chamber 10 flows and flushes the outer surface of the lower valve stem 11 and the inner surface of the lower shaft hole 12. The flushed cleaning fluid reaches the seat 504 on one side of the outlet pipe 7 and is discharged into the outlet pipe 7 through the discharge hole 506 inside the seat 504 and continues to flow backward and be discharged. This achieves the effect of flushing the inside of the balance chamber 10, especially the outer surface of the lower valve stem 11 and the inner surface of the lower shaft hole 12, avoiding the influence of residual media on the normal rotation and up and down movement of the valve core 3, and improving the comprehensiveness and efficiency of flushing.

[0049] Meanwhile, to improve the flushing effect, the telescopic component 402 drives the valve core 3 to move back and forth inside the balance chamber 10 via the mounting component 403. The volume below the balance chamber 10 changes continuously, so the pressure of the valve core 3 on the seat 504 changes continuously, and accordingly drives the seat 504 to move back and forth laterally between the inner ring 501 and the outer ring 502. The position of the discharge hole 506 caused by the seat 504 changes, and the blocking area of ​​the inner ring 501 on the discharge hole 506 changes accordingly. Therefore, the amount of cleaning fluid discharged along the discharge hole 506 and the discharge position change accordingly. The flow direction and flow rate of the cleaning fluid on the outer surface of the lower valve stem 11 and the inner surface of the lower shaft hole 12 also change accordingly, effectively achieving the pulse cleaning effect and avoiding the impact of the stable flow of the cleaning fluid inside the balance chamber 10 on the flushing effect of media with different adhesion.

[0050] After the inner wall of the balance chamber 10 and the outer surface of the valve core 3 are flushed, the drive shaft 401 continues to drive the valve core 3 to rotate through the telescopic member 402 and the mounting member 403. The telescopic member 402 drives the valve core 3 to move downward to return to its original position through the mounting member 403, and continues to repeat the above process to flush the subsequent medium and cleaning fluid.

[0051] This plug valve uses a balance chamber 10 to prevent mutual wear between the valve core 3 and the valve body 1, thus avoiding any impact on their strength. Simultaneously, the valve seat 5 provides an elastic seal between the valve body 1 and the valve core 3. Furthermore, the valve core 3's conical structure (wider at the top and narrower at the bottom) and its vertical movement adjust the sealing pressure with the valve seat 5, reducing the squeezing resistance during valve operation and ensuring high efficiency and ease of use. During valve closing, the filling within the balance chamber 10 resists the radial force on the valve core 3's sidewalls, preventing the valve core 3 from shifting within the balance chamber 10 and affecting the squeezing balance of the valve seats 5 on both sides. After prolonged use, the position of the valve core 3 within the balance chamber 10 adjusts the amount and position of the cleaning fluid discharged from the discharge hole 506, further achieving a flushing and cleaning effect on the inner wall of the balance chamber 10 and the outer surface of the valve core 3, especially the outer surface of the lower valve stem 11 and the inner surface of the lower shaft hole 12. This effectively prevents the adhering medium from affecting the subsequent rotation and vertical movement of the valve core 3.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealed and isolated balanced plug valve, comprising a valve body (1), wherein a balanced chamber (10) is provided inside the valve body (1), characterized in that, Also includes: The valve core (3) is rotatably connected to the inside of the balance chamber (10). The valve core (3) is a conical structure that is wider at the top and narrower at the bottom, and a through hole (9) is provided inside the valve core (3). The drive unit (4) is fixedly connected to the top of the valve core (3) and is used to drive the valve core (3) to move up and down or rotate inside the balance chamber (10); The valve seat (5) is fixedly connected to the inner walls of both sides of the balance chamber (10), including the seat body (504). The end of the seat body (504) is in contact with the side wall of the valve core (3). When the drive part (4) drives the valve core (3) to move downward along the balance chamber (10), the squeezing force between the valve core (3) and the seat body (504) increases and drives the two seats (504) to move away from each other.

2. The sealed and isolated balanced plug valve according to claim 1, characterized in that, The valve body (1) is bolted to the top of the valve cover (2), and the valve cover (2) has an installation hole (13) inside. A sealing ring (14) is fixedly installed on the inner wall below the installation hole (13). The bottom axis of the balance chamber (10) is fixedly connected to the lower valve stem (11), and multiple limiting pieces (15) are evenly fixedly connected to the top of the lower valve stem (11). The bottom axis of the valve core (3) has a lower shaft hole (12), and the lower valve stem (11) and the limiting pieces (15) are inserted into and rotated to connect with the lower shaft hole (12).

3. A sealed and isolated balanced plug valve according to claim 2, characterized in that, The drive unit (4) includes: Mounting component (403) is fixedly connected to the top of valve core (3) and is used to drive valve core (3) to rotate and move up and down; The drive shaft (401) is rotatably connected inside the mounting hole (13), and the bottom of the drive shaft (401) is fixedly connected to the top of the mounting part (403) through the telescopic part (402). The outer surface of the telescopic part (402) is sealed and movably connected to the inner wall of the sealing ring (14). The top of the drive shaft (401) is fixedly connected to the output end of the drive motor. The drive shaft (401) drives the valve core (3) to rotate through the telescopic part (402) and the mounting part (403). The telescopic part (402) drives the valve core (3) to move up and down through the mounting part (403).

4. A sealed and isolated balanced plug valve according to claim 1, characterized in that, One side of the valve body (1) is connected to an inlet pipe (6), the output end of the inlet pipe (6) is connected to the inside of the balance chamber (10), and the other side of the valve body (1) is connected to an outlet pipe (7), the input end of the outlet pipe (7) is connected to the inside of the balance chamber (10). The outer surfaces of the inlet pipe (6) and the outlet pipe (7) are both fixedly connected to flanges (8). The medium enters the balance chamber (10) and the through hole (9) along the inlet pipe (6) and is discharged along the outlet pipe (7).

5. A sealed and isolated balanced plug valve according to claim 4, characterized in that, The valve seat portion (5) includes: The inner ring (501) is symmetrically arranged on both sides of the balance chamber (10). The inner ring (501) is located outside the inlet pipe (6) and the outlet pipe (7), and the inner diameter of the inner ring (501) is greater than the inner diameter of the inlet pipe (6) and the outlet pipe (7). The outer ring (502) is symmetrically arranged on both sides of the balance cavity (10). The outer ring (502) is located outside the inner ring (501) and the inner diameter of the outer ring (502) is greater than the inner diameter of the inner ring (501). The disc spring (503) is located between the inner ring (501) and the outer ring (502). One end of the disc spring (503) is in contact with the inner wall of the balance chamber (10), and the other end is in contact with the side wall of the seat (504) away from the valve core (3). The disc spring (503) is elastic and applies elastic support force to the seat (504).

6. A sealed and isolated balanced plug valve according to claim 5, characterized in that, The valve seat portion (5) also includes: The flow holes (505) are evenly distributed inside the inner ring (501) near the liquid inlet pipe (6), and one side of the flow holes (505) is connected to the inside of the liquid inlet pipe (6), so that the medium inside the liquid inlet pipe (6) can flow along the flow holes (505). The discharge hole (506) is evenly distributed inside the seat (504), with one end corresponding to the flow hole (505) and the other end corresponding to the inside of the balance chamber (10). When the discharge hole (506) coincides with the flow hole (505), the medium inside the inlet pipe (6) can enter the balance chamber (10) along the flow hole (505) and the discharge hole (506). The discharge hole (506) is inclined and misaligned with the outer ring (502).

7. A sealed and isolated balanced plug valve according to claim 3, characterized in that, The height of the balance chamber (10) is greater than the height of the valve core (3). The difference between the height of the balance chamber (10), the valve core (3), and the mounting part (403) is greater than the height of the lower valve stem (11) and less than the sum of the heights of the lower valve stem (11) and the limiting part (15). When the mounting part (403) drives the valve core (3) to move upward along the balance chamber (10) to the maximum distance, the lower shaft hole (12) disengages from the lower valve stem (11) and remains engaged with the limiting part (15).

8. A sealed and isolated balanced plug valve according to claim 5, characterized in that, The inner diameter of the through hole (9) is smaller than the inner diameter of the inner ring (501), and the width of the through hole (9) is smaller than the distance between the two ends of the outer rings (502). The distance between the inner ring (501) and the outer ring (502) is the same as the width of the seat (504), and the sidewalls of the inner ring (501) and the outer ring (502) are both in a sealed sliding connection with the outer surface of the seat (504).

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