High performance double seal knife gate valve

Abstract

The application relates to the technical field of gate valves, in particular to a high-performance double-sealing knife-shaped gate valve, which comprises a valve shell, medium inlet pipes and medium outlet pipes communicated with the two ends of the valve shell, two sealing rubber tubes rotatably installed in the medium inlet pipes and the medium outlet pipes, a sealing arc block installed between the two sealing rubber tubes, a rotary driving device for driving the sealing rubber tubes to rotate, a gate seat slidably installed in the valve shell, a rotary body rotatably installed on the gate seat, sealing gate surfaces arranged at the two ends of the rotary body, sealing ring cavities installed on the two sealing gate surfaces, and a pressurizing cavity arranged in the rotary body and communicated with the inner cavities of the two sealing ring cavities. The multiple sealing structure design effectively solves the problem of poor sealing performance of the existing gate valve. First, the sealing rubber tubes and the sealing arc block are made of silica gel material, the good flexibility and sealing performance of which can tightly adhere to the inner wall of the pipeline and the gate seat, thereby reducing the possibility of medium leakage.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, and in particular to a high-performance double-seal knife gate valve. Background Technology

[0002] In the field of gate valve technology, existing gate valves have many technical problems in practical applications, as follows:

[0003] 1. Poor sealing performance: Existing gate valves have defects in their sealing structure design, which cannot effectively prevent media leakage. Their sealing components are difficult to fit tightly against the inner wall of the pipeline and the gate seat. During long-term use, the media is prone to leaking from the seal, affecting the normal use of the gate valve.

[0004] 2. Debris affects sealing performance: During the flow of the medium, debris in the medium in the existing gate valve is easy to stick to the sealing components, resulting in poor sealing when the gate seat is closed. Debris will also remain between the gate seat and the sealing components, increasing the gap ratio and reducing the sealing performance of the gate valve.

[0005] 3. Poor pressure adaptability: Existing gate valves are difficult to flexibly adjust the sealing pressure according to the medium with different pressures. When facing high pressure or medium with large pressure fluctuations, the sealing performance will be severely affected.

[0006] 4. Short gate seat life and difficult opening and closing: When the existing gate valve is working, the pressure difference on both sides of the gate seat is large, which causes the gate seat to bear a large pressure, shortens the service life of the gate seat, and also makes the valve difficult to open and close.

[0007] 5. Difficulty in cleaning the sealing surface: During the use of existing gate valves, dirt easily remains on the sealing surface and is difficult to clean effectively, which affects the sealing performance;

[0008] Based on this, we propose a high-performance double-seal knife gate valve. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a high-performance double-sealed knife gate valve.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a high-performance double-seal knife gate valve, comprising a valve body, wherein a medium inlet pipe and a medium outlet pipe are respectively connected to both ends of the valve body, and further comprising:

[0011] Two sealing rubber tubes are rotatably installed inside the medium inlet pipe and the medium outlet pipe, respectively.

[0012] A sealing arc block is installed between two sealing rubber cylinders;

[0013] A rotary drive device drives the sealing rubber cylinder to rotate. A gate seat is slidably installed inside the valve body. A rotating body is rotatably installed on the gate seat. A sealing gate surface is provided at both ends of the rotating body. A sealing ring bladder is installed on each of the two sealing gate surfaces. A pressurization chamber is opened inside each of the two rotating bodies. The two pressurization chambers are respectively connected to the inner cavities of the two sealing ring bladders.

[0014] Pressure regulating component, used to control the pressure amplitude of the pressurization chamber;

[0015] The pressure balancing chamber is located inside the gate seat and between two sealed gate surfaces. The pressure balancing assembly is used for pressure balancing within the pressure balancing chamber.

[0016] An electric drive mechanism is used to drive the displacement of the brake seat and the rotation of the rotating body.

[0017] Preferably, the rotary drive device includes a first dual-head motor mounted on the medium outlet pipe, an encoder integrated on the first dual-head motor, a set of hydrodynamic blades arranged in a circular array installed at one output shaft end of the first dual-head motor and at a position corresponding to the inner side of the medium outlet pipe, a synchronous shaft rotatably mounted inside the valve housing, a first synchronous toothed belt drivingly connecting the other output shaft end of the first dual-head motor and the synchronous shaft, and a first bevel tooth installed on both the sealing rubber sleeve and the synchronous shaft, with the two first bevel teeth meshing with each other.

[0018] Preferably, both the sealing tube and the sealing arc block are made of silicone. The sealing tube is a hollow cylindrical structure with openings at both ends. The central angle of the sealing arc block is 180°. A sealing groove adapted to the sealing arc block is fixedly provided at the bottom of the gate seat. The sealing arc block is located directly below the gate seat.

[0019] Preferably, the electric drive mechanism includes a bracket mounted on a valve housing, a transmission sleeve rotatably mounted on the valve housing, a threaded tube threaded onto the inner wall of the transmission sleeve, the bottom end of the threaded tube being rotatably connected to the gate seat via a bearing, an inner shaft rotatably mounted on the inner wall of the threaded tube, a second bevel tooth being mounted on both the bottom end of the inner shaft and the rotating body, the two second bevel teeth meshing with each other, a spindle rotatably mounted on the bracket, the inner shaft being driven by the spindle, a second double-headed motor mounted on the bracket, a second synchronous toothed belt drivingly connecting one output shaft end of the second double-headed motor to the transmission sleeve, and the other output shaft end of the second double-headed motor being drivingly connected to the spindle via a third synchronous toothed belt.

[0020] Preferably, the inner shaft has a fixed groove with a top opening that is slidably connected to the mandrel, and both the groove and the mandrel have a regular hexagonal cross-section.

[0021] Preferably, the pressure regulating assembly includes a pressure chamber mounted on the side of the valve housing. A bidirectional lead screw is rotatably mounted on the inner wall of the pressure chamber. A motor is mounted on the pressure chamber, and the output shaft of the motor is fixedly connected to the bidirectional lead screw. The bidirectional lead screw is provided with a positive thread section and a negative thread section respectively. A pressure plate is drivenly mounted on both the positive thread section and the negative thread section. A pressure chamber is provided between the two pressure plates and at a position corresponding to the inner side of the pressure chamber. A one-way air inlet valve communicating with the pressure chamber is fixedly mounted on the pressure chamber. A pressure delivery pipe is connected to the top of the pressure chamber. A pressure passage with two open ends is fixedly opened inside the mandrel. The other end of the pressure delivery pipe is rotatably connected to the pressure passage. A pressure-covering ring is fixedly mounted inside the gate seat. The inner cavity of the pressure-covering ring is rotatably connected to two pressure chambers respectively. A rotary joint is fixedly connected to the top of the pressure-covering ring. The bottom end of the pressure passage is connected to the rotary joint through a shaft groove.

[0022] Preferably, a one-way vent valve, a pressure relief valve, and a first pressure gauge are respectively installed on the pressure delivery pipe, and a first corrugated section is fixedly provided on the pressure delivery pipe.

[0023] Preferably, the pressure balancing assembly includes pressure balancing pipes installed on the medium inlet pipe and the medium outlet pipe, a pressure balancing ring rotatably mounted on the spiral tube, both pressure balancing pipes communicating with the inner cavity of the pressure balancing ring, a one-way liquid inlet valve provided at the connection between the two pressure balancing pipes and the pressure balancing ring, a ring channel fixedly opened inside the spiral tube, the inner cavity of the spiral tube rotatably communicating with the ring channel, the bottom end of the ring channel communicating with the pressure balancing chamber, and a second corrugated section provided on both pressure balancing pipes.

[0024] Preferably, the pressure balancing assembly further includes a second pressure gauge installed on the medium inlet pipe and the medium outlet pipe, and a microcontroller is installed on the valve body, with the data terminals of the first pressure gauge and the second pressure gauge both connected to the microcontroller.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention effectively solves the problem of poor sealing performance of existing gate valves through a multi-seal structure design. First, the sealing sleeve and sealing arc block are made of silicone, whose good flexibility and sealing performance can tightly fit the inner wall of the pipe and the gate seat, reducing the possibility of medium leakage. Second, when the gate seat is closed, the sealing arc block and the sealing groove at the bottom of the gate seat precisely match, further blocking the passage of medium. In addition, the sealing gate surface of the rotating body on the gate seat is equipped with a sealing ring bladder. After the gate seat is closed, the pressure regulating component pressurizes the pressurization chamber, causing the sealing ring bladder to inflate and expand, thus sealing the gap between the sealing gate surface and the sealing sleeve. This greatly improves the sealing strength at the connection between the gate seat and the medium inlet and outlet pipes. This is a multi-seal reinforcement design that existing gate valves do not have.

[0027] This invention features a unique rotary drive device. After the gate valve is opened and the gate seat moves away from the sealing arc block to a specified distance, a first dual-head motor drives the sealing rubber cylinder and the sealing arc block to revolve. This motion reduces the adhesion rate of debris on the sealing rubber cylinder and the sealing arc block during medium flow, and reduces the gap rate between the gate seat and the sealing components when the gate seat is closed. On the other hand, it can also rotaryly scrape or remove blockages between the gate seat and the sealing arc block during medium flow, effectively reducing the debris residue rate and ensuring the high sealing performance of the gate valve. This fundamentally solves the problem of debris affecting the seal and is innovative compared to existing gate valves.

[0028] The pressure regulating component of this invention can flexibly control the pressure range of the pressurizing chamber according to the actual working conditions. The pressure regulating component drives the pressure plate to move through the bidirectional screw, thereby changing the volume of the pressure chamber and controlling the pressure of the sealing ring bladder. The one-way vent valve, pressure relief valve and first pressure gauge installed on the pressure delivery pipe can monitor and control the pressure in real time, ensuring a good sealing effect under different pressure media. This makes the invention adaptable to media with different pressures, effectively solving the problem of poor pressure adaptability of existing gate valves, and providing a reliable guarantee for applications in different pressure environments in industrial production.

[0029] The pressure balancing assembly of this invention effectively solves the problems of short gate seat life and non-smooth opening and closing in existing gate valves. The pressure balancing pipe introduces the pressure of the medium inlet pipe and the medium outlet pipe into the pressure balancing chamber. The one-way liquid inlet valve prevents liquid backflow and keeps the pressure in the pressure balancing chamber balanced with the pressure in the pipeline. This reduces the pressure difference on both sides of the gate seat and reduces the pressure on the gate seat, thereby extending the service life of the gate seat. At the same time, the reduction of the pressure difference makes the valve opening and closing smoother, improving the working efficiency and stability of the gate valve. This is an advantage that is difficult to achieve in the structural design of existing gate valves.

[0030] The electric drive mechanism of this invention can rotate the rotating body while driving the gate seat to move. After the rotating body rotates, it can fully scrape off the dirt remaining on the two sealing gate surfaces by cooperating with the valve body, thus ensuring the cleanliness of the sealing gate surfaces. This effectively solves the problem of difficult cleaning of the sealing gate surfaces and further improves the sealing performance and overall working effect of the gate valve. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a high-performance double-seal knife gate valve according to the present invention;

[0032] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the partial structure at point A in the middle;

[0033] Figure 3 For the present invention Figure 1A magnified view of the structure at point B in the middle;

[0034] Figure 4 For the present invention Figure 1 A schematic diagram of the cross-sectional structure;

[0035] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the local structure at point C;

[0036] Figure 6 For the present invention Figure 4 A magnified schematic diagram of the local structure at point D;

[0037] Figure 7 This is a schematic diagram of the pressure balance tube and support of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the sealing rubber tube and sealing arc block of the present invention;

[0039] Figure 9 This is a schematic diagram of the structure of the mandrel and inner shaft of the present invention;

[0040] Figure 10 This is a schematic diagram of the structure of the gate seat of the present invention;

[0041] Figure 11 This is a schematic diagram of the bidirectional lead screw and the pressure plate of the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the rotating body of the present invention.

[0043] 1. Valve housing; 2. Medium inlet pipe; 3. Medium outlet pipe; 4. Sealing sleeve; 5. Sealing arc block; 6. Gate seat; 7. Rotating body; 8. Sealing gate surface; 9. Sealing ring bladder; 10. Pressurization chamber; 11. Pressure balance chamber; 12. First dual-head motor; 13. Hydrodynamic blade; 14. Synchronous shaft; 15. Bracket; 16. Transmission threaded sleeve; 17. Helical tube; 18. Inner shaft; 19. Mandrel; 20. Second dual-head motor; 21. Drum shell; 22. Bidirectional lead screw; 23. Motor; 24. Drum plate; 25. One-way air inlet valve; 26. Pressure delivery pipe; 27. Pressure flow channel; 28. Pressure distribution ring; 29. ​​Rotary joint; 30. One-way air outlet valve; 31. Pressure relief valve; 32. First pressure gauge; 33. Pressure balance pipe; 34. Pressure balance ring; 35. Ring channel; 36. Second pressure gauge; 37. Microcontroller. Detailed Implementation

[0044] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0045] like Figures 1-12 The high-performance double-seal knife gate valve shown includes a valve body 1, with a medium inlet pipe 2 and a medium outlet pipe 3 respectively connected to both ends of the valve body 1. Both the medium inlet pipe 2 and the medium outlet pipe 3 are provided with flange connection surfaces.

[0046] Two sealing rubber tubes 4 are respectively rotatably installed in the medium inlet pipe 2 and the medium outlet pipe 3;

[0047] The sealing arc block 5 is installed between the two sealing rubber cylinders 4;

[0048] A rotary drive device drives the sealing rubber cylinder 4 to rotate;

[0049] Both the sealing tube 4 and the sealing arc block 5 are made of silicone. The sealing tube 4 is a hollow cylindrical structure with open ends. The central angle of the sealing arc block 5 is 180°. The bottom of the gate seat 6 is fixedly provided with a sealing groove that matches the sealing arc block 5. The sealing arc block 5 is located directly below the gate seat 6.

[0050] Silicone material has good flexibility and sealing properties, which can better fit the inner wall of the pipe and the gate seat 6, effectively preventing media leakage;

[0051] The design of the sealing arc block 5 and the gate seat 6 enhances the sealing effect. When the gate seat 6 is closed, it can further block the medium from passing through and improve the overall sealing performance of the valve.

[0052] When the gate valve is closed, the sealing arc block 5 is located directly below the gate seat 6, and the sealing arc block 5 is directly opposite the sealing groove. When the gate seat 6 is closed, the sealing groove and the sealing arc block 5 are sealed together, thereby sealing the gate valve.

[0053] When the gate valve is in the open state and the gate seat 6 is far away from the sealing arc block 5 to a specified degree, the medium inlet pipe 2 and the medium outlet pipe 3 are in a connected state. After that, the first double-head motor 12 is turned on. After the first double-head motor 12 is turned on, it drives the sealing rubber cylinder 4 and the sealing arc block 5 to revolve. Through the revolve motion of the sealing rubber cylinder 4 and the sealing arc block 5, the adhesion rate of impurities in the medium on the sealing rubber cylinder 4 and the sealing arc block 5 during medium flow can be effectively reduced, thereby reducing the gap rate between the gate seat 6 and the sealing arc block 5 and the sealing rubber cylinder 4 when the gate seat 6 is closed.

[0054] On the other hand, the rotational motion of the sealing sleeve 4 and the sealing arc block 5 can rotate and scrape out the blockage between the gate seat 6 and the sealing arc block 5 when the medium flows, thereby reducing the residual rate of the blockage between the gate seat 6 and the sealing arc block 5 in the medium, and thus ensuring the high sealing degree of this gate valve.

[0055] The rotary drive device includes a first dual-head motor 12 mounted on the medium outlet pipe 3. The first dual-head motor 12 integrates an encoder. A set of water-driven blades 13 arranged in a circular array are installed at one output shaft end of the first dual-head motor 12 and at a position corresponding to the inner side of the medium outlet pipe 3. A synchronous shaft 14 is rotatably mounted inside the valve housing 1. A first synchronous toothed belt is connected between the other output shaft end of the first dual-head motor 12 and the synchronous shaft 14. A first bevel tooth is installed on both a sealing rubber sleeve 4 and the synchronous shaft 14, and the two first bevel teeth mesh with each other.

[0056] The beneficial effect of adopting the above scheme is that the encoder can accurately control the rotation angle and speed of the first dual-head motor 12, thereby accurately controlling the number of rotations and rotation angle of the sealing rubber cylinder 4.

[0057] Preferably, when the first dual-head motor 12 rotates, the number of rotations of the first dual-head motor 12 should be an integer number of rotations. When the gate valve is about to close, by setting the number of output rotations of the first dual-head motor 12, the sealing arc block 5 should be positioned directly below the sealing groove. Subsequently, the gate seat 6 moves down to complete the closing of the gate valve and the fitting of the sealing groove with the sealing arc block 5.

[0058] The hydrodynamic blade 13 uses the power generated by the flow of the medium to assist the first dual-head motor 12 in driving. When the medium is flowing, the motor energy consumption can be reduced and the energy utilization efficiency can be improved. At the same time, this structural design makes the drive of the sealing rubber cylinder 4 more stable and reliable.

[0059] A gate seat 6 is slidably installed inside the valve housing 1;

[0060] The valve housing 1 is provided with a slide rail for guiding the gate seat 6;

[0061] A rotating body 7 is rotatably mounted on the gate seat 6. A sealing gate surface 8 is provided at both ends of the rotating body 7. A sealing ring bladder 9 is installed on each of the two sealing gate surfaces 8. A pressurizing chamber 10 is opened inside each of the two rotating bodies 7. The two pressurizing chambers 10 are respectively connected to the inner cavities of the two sealing ring bladders 9.

[0062] A pressure regulating component is used to control the pressure amplitude of the pressurization chamber 10;

[0063] The beneficial effect of adopting the above scheme is that when the gate seat 6 is in the movement state before closing, the gas inside the sealing ring bladder 9 is fully vented through the pressure relief valve 31. After the gate seat 6 is closed, the pressure regulating component pressurizes the two pressurizing chambers 10 to a sufficient amount. After the two pressurizing chambers 10 are fully pressurized, the sealing ring bladder 9 is inflated and expanded. After the sealing ring bladder 9 is inflated and expanded, it further pressurizes and seals the gap between the sealing gate surface 8 and the sealing rubber sleeve 4, thereby improving the sealing strength at the connection between the gate seat 6 and the medium inlet pipe 2 and the medium outlet pipe 3.

[0064] The pressure balance chamber 11 is located inside the gate seat 6 and between the two sealing gate surfaces 8;

[0065] Pressure balancing assembly, used for pressure balancing within pressure balancing chamber 11;

[0066] An electric drive mechanism is used to drive the displacement of the gate seat 6 and the rotation of the rotating body 7.

[0067] The electric drive mechanism includes a bracket 15 mounted on the valve housing 1, a transmission sleeve 16 rotatably mounted on the valve housing 1, a threaded tube 17 threaded on the inner wall of the transmission sleeve 16, the bottom end of the threaded tube 17 being rotatably connected to the gate seat 6 via a bearing, an inner shaft 18 rotatably mounted on the inner wall of the threaded tube 17, a second bevel tooth being mounted on the bottom end of the inner shaft 18 and on the rotating body 7, the two second bevel teeth meshing with each other, a spindle 19 rotatably mounted on the bracket 15, and the inner shaft 18 being driven by the spindle 19;

[0068] The inner shaft 18 has a fixed groove with an open top and slidably connected to the spindle 19. Both the groove and the spindle 19 have regular hexagonal cross sections.

[0069] A second dual-head motor 20 is mounted on the bracket 15. A second synchronous toothed belt is connected between one output shaft end of the second dual-head motor 20 and the transmission sleeve 16. The other output shaft end of the second dual-head motor 20 is connected to the spindle 19 through a third synchronous toothed belt.

[0070] The beneficial effect of adopting the above scheme is that, during operation, the second double-head motor 20 can drive the transmission screw sleeve 16 to move the gate seat 6 up or down at a set speed. At the same time, when the second double-head motor 20 is working, the rotating body 7 rotates. After the rotating body 7 rotates, it cooperates with the valve body 1 to fully scrape off the dirt remaining on the two sealing gate surfaces 8 by rotation and scraping, thereby ensuring the cleanliness of the two sealing gate surfaces 8.

[0071] The pressure regulating assembly includes a pressure chamber 21 mounted on the side of the valve housing 1. A bidirectional lead screw 22 is rotatably mounted on the inner wall of the pressure chamber 21. A motor 23 is mounted on the pressure chamber 21, and the output shaft end of the motor 23 is fixedly connected to the bidirectional lead screw 22. The bidirectional lead screw 22 is provided with a positive thread section and a negative thread section respectively. A pressure plate 24 is drivenly mounted on both the positive thread section and the negative thread section. A pressure chamber is provided between the two pressure plates 24 and at a position corresponding to the inner side of the pressure chamber 21. The pressure chamber 21 is fixedly mounted on the pressure chamber 21. A one-way air intake valve 25 is installed in the pressure chamber. A pressure delivery pipe 26 is connected to the top of the pressure chamber. A pressure passage 27 with openings at both ends is fixedly opened inside the spindle 19. The other end of the pressure delivery pipe 26 is rotatably connected to the pressure passage 27. A pressure-covering ring 28 is fixedly installed inside the gate seat 6. The inner cavity of the pressure-covering ring 28 is rotatably connected to the two pressure chambers 10 respectively. A rotary joint 29 is fixedly connected to the top of the pressure-covering ring 28. The bottom end of the pressure passage 27 is connected to the rotary joint 29 through a shaft groove.

[0072] The pressure regulating component controls the pressure amplitude of the filling chamber 10 through components such as the bidirectional lead screw 22, the pressure plate 24, and the pressure chamber. The bidirectional lead screw 22 drives the pressure plate 24 to move, changing the volume of the pressure chamber, thereby controlling the pressure of filling the sealing ring bladder 9.

[0073] This design allows for flexible adjustment of the pressure of the sealing ring bladder 9 according to actual working conditions, ensuring a good sealing effect under different pressure media. The one-way vent valve 30, pressure relief valve 31, and first pressure gauge 32 on the pressure delivery pipe 26 can monitor and control the pressure in real time, ensuring the safety and stability of the pressurization process.

[0074] A one-way vent valve 30, a pressure relief valve 31, and a first pressure gauge 32 are respectively installed on the pressure supply pipe 26, and a first corrugated section is fixedly installed on the pressure supply pipe 26.

[0075] By setting the one-way vent valve 30, the gas delivered by the pressure delivery pipe 26 is ensured to flow out of the pressure chamber in one direction. By setting the pressure relief valve 31, the gas in the pressure chamber 10 or the air pressure in the pressure delivery pipe 26 is discharged. By setting the first pressure gauge 32, the internal pressure in the pressure chamber 10 is monitored in real time.

[0076] The pressure balancing assembly includes pressure balancing pipes 33 installed on the medium inlet pipe 2 and the medium outlet pipe 3. A pressure balancing ring 34 is rotatably installed on the spiral tube 17. Both pressure balancing pipes 33 are connected to the inner cavity of the pressure balancing ring 34. A one-way liquid inlet valve is provided at the connection between the two pressure balancing pipes 33 and the pressure balancing ring 34. An annular channel 35 is fixedly opened inside the spiral tube 17. The inner cavity of the spiral tube 17 is rotatably connected to the annular channel 35. The bottom end of the annular channel 35 is connected to the pressure balancing chamber 11. A second corrugated section is provided on both pressure balancing pipes 33.

[0077] The pressure balancing assembly also includes a second pressure gauge 36 installed on the medium inlet pipe 2 and the medium outlet pipe 3. A microcontroller 37 is installed on the valve body 1. The data terminals of the first pressure gauge 32 and the second pressure gauge 36 are both connected to the microcontroller 37.

[0078] The pressure from the medium inlet pipe 2 and the medium outlet pipe 3 is introduced into the pressure balance chamber 11 through the pressure balance pipe 33. The one-way inlet valve prevents backflow of liquid and keeps the pressure in the pressure balance chamber 11 balanced with the pressure in the pipeline. This can effectively reduce the pressure difference on both sides of the gate seat 6, reduce the pressure on the gate seat 6, extend the service life of the gate seat 6, and improve the smoothness of valve opening and closing. The second pressure gauge 36, together with the microcontroller 37, can monitor the changes in pipeline pressure in real time so as to adjust the pressure balance in time and enhance the stability and reliability of the system.

[0079] The working principle of this invention is as follows: When the gate valve is open, when the gate seat 6 moves away from the sealing arc block 5 to a specified degree, the medium inlet pipe 2 and the medium outlet pipe 3 are connected. At this time, the first double-head motor 12 is turned on. The encoder integrated on the first double-head motor 12 precisely controls its rotation angle and speed, thereby precisely controlling the number of rotations and angle of the sealing rubber cylinder 4. The number of rotations of the motor is guaranteed to be an integer number of rotations. The motor drives the water turbine blade 13, using the power generated by the medium flow to assist the drive. At the same time, the first synchronous tooth belt drives the synchronous shaft 14, and then the first bevel gear transmission causes the sealing rubber cylinder 4 and the sealing arc block 5 to revolve. This movement reduces the adhesion rate of medium impurities on the sealing rubber cylinder 4 and the sealing arc block 5, reducing the gap rate when the gate seat 6 is closed. On the other hand, it can scrape off the blockage between the gate seat 6 and the sealing arc block 5, ensuring the high sealing degree of the gate valve.

[0080] Before the gate valve is in the closing state, the number of output revolutions of the first dual-head motor 12 is set to ensure that the sealing arc block 5 is located directly below the sealing groove. Then the gate seat 6 moves down, and the sealing groove and the sealing arc block 5 seal and fit together, thus completing the gate valve closure.

[0081] When the gate seat 6 is in motion before it is closed, the gas inside the sealing ring bladder 9 is fully vented through the pressure relief valve 31;

[0082] After the gate seat 6 is closed, the pressure regulating component starts to work. The motor 23 drives the bidirectional lead screw 22 to rotate. The positive and negative thread sections on the bidirectional lead screw 22 drive the two pressure plates 24 to move, changing the volume of the pressure chamber. Air is drawn in through the one-way air inlet valve 25 and sent into the pressure passage 27 of the mandrel 19 through the pressure delivery pipe 26. Then, it enters the pressure distribution ring 28 through the shaft groove and rotary joint 29, and pressurizes the two pressure chambers 10. The sealing ring bladder 9 is inflated and expands, and the gap between the sealing gate surface 8 and the sealing rubber sleeve 4 is sealed by air, which improves the sealing strength at the connection between the gate seat 6 and the medium inlet pipe 2 and the medium outlet pipe 3.

[0083] The one-way vent valve 30 on the pressure delivery pipe 26 ensures one-way gas flow, and the pressure relief valve 31 can discharge the gas pressure in the pressurization chamber 10 or the pressure delivery pipe 26. The first pressure gauge 32 monitors the internal pressure in the pressurization chamber 10 in real time. Throughout the process, the pressure balancing component plays a role. The pressure balancing pipe 33 on the medium inlet pipe 2 and the medium outlet pipe 3 introduces the pipeline pressure into the pressure balancing chamber 11. The one-way liquid inlet valve prevents liquid backflow. The second corrugated section on the pressure balancing pipe 33 can adapt to certain pressure changes. The pressure balancing ring 34 rotatably installed on the solenoid 17 is connected to the pressure balancing pipe 33. The pressure balancing ring 34 is connected to the inner cavity of the solenoid 17 through the ring channel 35 and finally connected to the pressure balancing chamber 11. The second pressure gauge 36 on the medium inlet pipe 2 and the medium outlet pipe 3, together with the microcontroller 37 on the valve body 1, monitors the pipeline pressure changes in real time so as to adjust the pressure balance in time, reduce the pressure difference on both sides of the gate seat 6, reduce the pressure on the gate seat 6, extend the service life of the gate seat 6, and improve the smoothness of valve opening and closing.

[0084] Regarding the electric drive mechanism, when the second dual-head motor 20 is working, on the one hand, it drives the transmission sleeve 16 through the second synchronous toothed belt, causing the gate seat 6 to move up or down at a set speed. On the other hand, the other output shaft of the second dual-head motor 20 drives the spindle 19 through the third synchronous toothed belt. The spindle 19 drives the inner shaft 18. The second bevel tooth at the bottom of the inner shaft 18 meshes with the second bevel tooth on the rotating body 7, causing the rotating body 7 to rotate. Through cooperation with the valve body 1, it scrapes away the dirt remaining on the two sealing gate surfaces 8, ensuring the cleanliness of the sealing gate surfaces 8.

[0085] When the rotating body 7 rotates, the sealing gate surface 8 rubs against the inner wall of the valve body 1, scraping away residual dirt.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A high-performance double-seal knife gate valve, comprising a valve body (1), wherein a medium inlet pipe (2) and a medium outlet pipe (3) are respectively connected to both ends of the valve body (1), characterized in that, Also includes: Two sealing tubes (4) are rotatably installed in the medium inlet pipe (2) and the medium outlet pipe (3), respectively; A sealing arc block (5) is installed between two sealing rubber cylinders (4); A rotary drive device drives the sealing rubber cylinder (4) to rotate. A gate seat (6) is slidably installed inside the valve housing (1). A rotating body (7) is rotatably installed on the gate seat (6). A sealing gate surface (8) is provided at both ends of the rotating body (7). A sealing ring bladder (9) is installed on each of the two sealing gate surfaces (8). A pressurization chamber (10) is opened inside each of the two rotating bodies (7). The two pressurization chambers (10) are respectively connected to the inner cavities of the two sealing ring bladders (9). A pressure regulating component is used to control the pressure amplitude of the pressurization chamber (10); Pressure balancing chamber (11) is located inside the gate seat (6) and between two sealing gate surfaces (8). Pressure balancing assembly is used for pressure balancing inside the pressure balancing chamber (11). An electric drive mechanism is used to drive the displacement of the gate seat (6) and the rotation of the rotating body (7).

2. The high-performance double-seal knife gate valve according to claim 1, characterized in that: The rotary drive device includes a first dual-head motor (12) mounted on the medium outlet pipe (3). The first dual-head motor (12) is integrated with an encoder. A set of hydrodynamic blades (13) arranged in a circular array are installed at one output shaft end of the first dual-head motor (12) and at a position corresponding to the inner side of the medium outlet pipe (3). A synchronous shaft (14) is rotatably installed inside the valve housing (1). A first synchronous toothed belt is connected between the other output shaft end of the first dual-head motor (12) and the synchronous shaft (14). A first bevel tooth is installed on both the sealing rubber sleeve (4) and the synchronous shaft (14). The two first bevel teeth mesh with each other.

3. The high-performance double-seal knife gate valve according to claim 1, characterized in that: Both the sealing tube (4) and the sealing arc block (5) are made of silicone. The sealing tube (4) is a hollow cylindrical structure with openings at both ends. The central angle of the sealing arc block (5) is 180°. The bottom of the gate seat (6) is fixedly provided with a sealing groove that matches the sealing arc block (5). The sealing arc block (5) is located directly below the gate seat (6).

4. The high-performance double-seal knife gate valve according to claim 1, characterized in that: The electric drive mechanism includes a bracket (15) mounted on a valve housing (1). A transmission sleeve (16) is rotatably mounted on the valve housing (1). A threaded tube (17) is threaded onto the inner wall of the transmission sleeve (16). The bottom end of the threaded tube (17) is rotatably connected to the gate seat (6) via a bearing. An inner shaft (18) is rotatably mounted on the inner wall of the threaded tube (17). A second bevel tooth is mounted on the bottom end of the inner shaft (18) and on the rotating body (7). The two second bevel teeth mesh with each other. A spindle (19) is rotatably mounted on the bracket (15). The inner shaft (18) is driven by the spindle (19). A second double-headed motor (20) is mounted on the bracket (15). A second synchronous toothed belt is connected between one output shaft end of the second double-headed motor (20) and the transmission sleeve (16). The other output shaft end of the second double-headed motor (20) is connected to the spindle (19) via a third synchronous toothed belt.

5. A high-performance double-seal knife gate valve according to claim 4, characterized in that: The inner shaft (18) has a fixed groove with an open top and sliding connection with the mandrel (19). The cross-sections of the groove and the mandrel (19) are both regular hexagonal.

6. A high-performance double-seal knife gate valve according to claim 4, characterized in that: The pressure regulating assembly includes a pressure chamber (21) mounted on the side of the valve housing (1). A bidirectional lead screw (22) is rotatably mounted on the inner wall of the pressure chamber (21). A motor (23) is mounted on the pressure chamber (21). The output shaft end of the motor (23) is fixedly connected to the bidirectional lead screw (22). The bidirectional lead screw (22) is provided with a positive thread section and a negative thread section respectively. A pressure plate (24) is drivenly mounted on both the positive thread section and the negative thread section. A pressure chamber is provided between the two pressure plates (24) and at a position corresponding to the inner side of the pressure chamber (21). The pressure chamber (21) is fixedly mounted on the pressure chamber (21). A one-way air intake valve (25) connected to the pressure chamber is installed. A pressure delivery pipe (26) is connected to the top of the pressure chamber. A pressure passage (27) with openings at both ends is fixedly opened inside the spindle (19). The other end of the pressure delivery pipe (26) is rotatably connected to the pressure passage (27). A pressure-covering ring (28) is fixedly installed inside the gate seat (6). The inner cavity of the pressure-covering ring (28) is rotatably connected to two pressure chambers (10) respectively. A rotary joint (29) is fixedly connected to the top of the pressure-covering ring (28). The bottom end of the pressure passage (27) is connected to the rotary joint (29) through a shaft groove.

7. A high-performance double-seal knife gate valve according to claim 6, characterized in that: The pressure supply pipe (26) is equipped with a one-way air outlet valve (30), a pressure relief valve (31) and a first pressure gauge (32), and a first corrugated section is fixedly provided on the pressure supply pipe (26).

8. A high-performance double-seal knife gate valve according to claim 7, characterized in that: The pressure balancing assembly includes pressure balancing pipes (33) installed on the medium inlet pipe (2) and the medium outlet pipe (3). A pressure balancing ring (34) is rotatably installed on the spiral tube (17). Both pressure balancing pipes (33) are connected to the inner cavity of the pressure balancing ring (34). A one-way liquid inlet valve is provided at the connection between the two pressure balancing pipes (33) and the pressure balancing ring (34). A ring channel (35) is fixedly opened inside the spiral tube (17). The inner cavity of the spiral tube (17) is rotatably connected to the ring channel (35). The bottom end of the ring channel (35) is connected to the pressure balancing chamber (11). A second corrugated section is provided on both pressure balancing pipes (33).

9. A high-performance double-seal knife gate valve according to claim 8, characterized in that: The pressure balancing assembly also includes a second pressure gauge (36) installed on the medium inlet pipe (2) and the medium outlet pipe (3). A microcontroller (37) is installed on the valve body (1). The data terminals of the first pressure gauge (32) and the second pressure gauge (36) are both connected to the microcontroller (37).

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