High-performance double-sealing knife-shaped gate valve

Abstract

The invention 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, two sealing rubber cylinders, a sealing arc block and a rotary driving device, a medium inlet pipe and a medium outlet pipe are communicated with the two ends of the valve shell respectively, the two sealing rubber cylinders are rotationally installed in the medium inlet pipe and the medium outlet pipe respectively, and the sealing arc block is installed between the two sealing rubber cylinders. A sealing rubber sleeve is arranged in the valve shell to drive the sealing rubber sleeve to rotate, a gate seat is installed in the valve shell in a sliding mode, a rotating body is installed on the gate seat in a rotating mode, the two ends of the rotating body are each provided with a sealing gate face, the two sealing gate faces are each provided with a sealing ring bag, the interiors of the two rotating bodies are each provided with a pressurizing cavity, and the two pressurizing cavities are communicated with inner cavities of the two sealing ring bags respectively. Through the multi-sealing structure design, the problem that an existing gate valve is poor in sealing performance is effectively solved, firstly, the sealing rubber barrel and the sealing arc block are made of silica gel materials, the sealing rubber barrel and the sealing arc block can be tightly attached to the inner wall of a pipeline and a gate base due to the good flexibility and sealing performance, and the possibility of medium leakage is reduced;

Description

Technical Field

[0001] The present invention relates to the technical field of gate valves, and in particular to a high-performance double-sealing knife gate valve. Background Art

[0002] In the technical field of gate valves, there are many technical problems in the actual application of existing gate valves, which are as follows: 1. Poor sealing performance: There are defects in the sealing structure design of existing gate valves, which cannot effectively prevent medium leakage. Its sealing components are difficult to closely fit the inner wall of the pipeline and the valve seat. During long-term use, the medium is likely to leak from the seal, affecting the normal use of the gate valve; 2. Debris affects the sealing effect: During the flow of the medium in existing gate valves, debris in the medium is easily adhered to the sealing components, resulting in poor sealing when the valve seat is closed. Debris will also remain between the valve seat and the sealing components, increasing the gap rate and reducing the sealing degree of the gate valve; 3. Poor pressure adaptability: Existing gate valves are difficult to flexibly adjust the sealing pressure according to media with different pressures. When facing high-pressure or media with large pressure fluctuations, the sealing performance will be seriously affected; 4. Short service life of the valve seat and unsmooth opening and closing: When existing gate valves are working, the pressure difference on both sides of the valve seat is large, resulting in the valve seat bearing a large pressure, shortening the service life of the valve seat, and at the same time making the valve opening and closing unsmooth; 5. Difficult to clean the sealing gate surface: During the use of existing gate valves, dirt is easily left on the sealing gate surface and is difficult to effectively clean, which will affect the sealing performance; Based on this, we propose a high-performance double-sealing knife gate valve. Summary of the Invention

[0003] The purpose of the present invention is to solve the disadvantages existing in the background art, and to propose a high-performance double-sealing knife gate valve.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A high-performance double-sealing knife gate valve, including a valve housing, both ends of the valve housing are respectively communicated with a medium inlet pipe and a medium outlet pipe, and further includes: Two sealing rubber cylinders, which are respectively rotatably installed in the medium inlet pipe and the medium outlet pipe; A sealing arc block, installed between the two sealing rubber cylinders; A rotary driving device for driving the sealing rubber cylinder to rotate. A valve seat is slidably installed in the valve housing. A rotating body is rotatably installed on the valve seat. Sealing gate surfaces are arranged at both ends of the rotating body. Sealing ring bags are installed on both of the two sealing gate surfaces. Pressure chambers are respectively opened in the two rotating bodies. The two pressure chambers are respectively communicated with the inner cavities of the two sealing ring bags; A pressure regulating component for controlling the pressurization amplitude of the pressure chamber; A pressure balance chamber is provided in the gate seat and disposed between two sealing gate surfaces, and a pressure balance component is used for balancing the pressure in the pressure balance chamber; The electric drive mechanism is used to drive the gate seat to move and the rotating body to rotate.

[0005] Preferably, the rotary drive device includes a first double-headed motor installed on the medium outlet pipe, an encoder is integrated on the first double-headed motor, a group of hydraulic blades distributed in a circular array are installed at one output shaft end of the first double-headed motor and at a position corresponding to the inner side of the medium outlet pipe, a synchronous shaft is rotatably installed in the valve housing, a first synchronous toothed belt is transmission-connected between the other output shaft end of the first double-headed motor and the synchronous shaft, and first bevel teeth are installed on both the sealing rubber cylinder and the synchronous shaft, and the two first bevel teeth are meshed with each other.

[0006] Preferably, the sealing rubber tube and the sealing arc block are both made of silicone material, the sealing rubber tube is a hollow cylindrical structure with openings at both ends, the central angle corresponding to the sealing arc block is 180°, and a sealing groove adapted to the sealing arc block is fixedly provided at the bottom of the gate seat, and the sealing arc block is arranged directly below the gate seat.

[0007] Preferably, the electric drive mechanism includes a bracket mounted on the valve housing, a transmission screw sleeve is rotatably mounted on the valve housing, a screw tube is threadedly mounted on the inner wall of the transmission screw sleeve, the bottom end of the screw tube is rotatably connected to the gate seat through a bearing, an inner shaft is rotatably mounted on the inner wall of the screw tube, a second bevel tooth is mounted on the bottom end of the inner shaft and the rotating body, two of the second bevel teeth are meshed with each other, a core shaft is rotatably mounted on the bracket, the inner shaft is driven by the core shaft, a second double-headed motor is mounted on the bracket, a second synchronous toothed belt is transmission-connected between one output shaft end of the second double-headed motor and the transmission screw sleeve, and the other output shaft end of the second double-headed motor is transmission-connected to the core shaft through a third synchronous toothed belt.

[0008] Preferably, an axial groove with a top opening and slidably connected to the core shaft is fixedly opened inside the inner shaft, and the cross-sections of the axial groove and the core shaft are both regular hexagons.

[0009] Preferably, the pressure regulating assembly includes a pressure drum housing installed on the side of the valve housing. A bidirectional lead screw is rotatably installed on the inner wall of the pressure drum housing. A motor is installed on the pressure drum housing, and the output shaft end of the motor is fixedly connected to the bidirectional lead screw. A positive thread section and a reverse thread section are respectively arranged on the bidirectional lead screw. A pressure drum plate is drivingly installed on each of the positive thread section and the reverse thread section. A pressure drum chamber is provided between the two pressure drum plates and corresponding to the inside of the pressure drum housing. A one-way intake valve communicating with the pressure drum chamber is fixedly installed on the pressure drum housing. A pressure delivery pipe is communicated at the top of the pressure drum chamber. A pressure flow channel with both ends open is fixedly opened inside the mandrel. The other end of the pressure delivery pipe is rotatably communicated with the pressure flow channel. A pressure distribution ring is fixedly installed in the gate seat. The inner cavities of the pressure distribution ring are respectively rotatably communicated with the two pressure charging cavities. The top end of the pressure distribution ring is fixedly communicated with a rotary joint. The bottom end of the pressure flow channel is communicated with the rotary joint through an axial groove.

[0010] Preferably, a one-way exhaust valve, a pressure relief valve and a first pressure gauge are respectively installed on the pressure delivery pipe. A first corrugated section is fixedly arranged on the pressure delivery pipe.

[0011] Preferably, the pressure balance assembly includes a pressure balance pipe installed on the medium inlet pipe and the medium outlet pipe. A pressure balance ring is rotatably installed on the spiral pipe. The two pressure balance pipes are both communicated with the inner cavity of the pressure balance ring. A one-way liquid inlet valve is arranged at the communicating position of each of the two pressure balance pipes and the pressure balance ring. An annular channel is fixedly opened inside the spiral pipe. The inner cavity of the spiral pipe is rotatably communicated with the annular channel. The bottom end of the annular channel is communicated with the pressure balance chamber. Second corrugated sections are arranged on the two pressure balance pipes.

[0012] Preferably, the pressure balance assembly further includes a second pressure gauge installed on the medium inlet pipe and the medium outlet pipe. A single-chip microcomputer is installed on the valve housing. The data ends of the first pressure gauge and the second pressure gauge are both connected to the single-chip microcomputer in terms of data.

[0013] Compared with the prior art, the present invention has the following beneficial effects: Through the design of a multi-layer sealing structure, the present invention effectively solves the problem of poor sealing performance of the existing gate valve. First of all, the sealing rubber cylinder and the sealing arc block are made of silica gel material. Their good flexibility and sealing performance can closely fit the inner wall of the pipeline and the gate seat, reducing the possibility of medium leakage. Secondly, when the gate seat is closed, the sealing arc block is accurately matched with the sealing groove at the bottom of the gate seat to further block the passage of the medium. In addition, a sealing ring capsule is installed on the sealing gate surface of the rotating body on the gate seat. After the gate seat is closed, the pressure regulating assembly pressurizes the pressure charging cavity, so that the sealing ring capsule inflates, and seals and plugs the gap between the sealing gate surface and the sealing rubber cylinder by inflation, greatly improving the sealing strength at the connection between the gate seat and the medium inlet pipe and the medium outlet pipe. This is a multi-layer sealing strengthening design not possessed by the existing gate valve; The present invention designs a unique rotary drive device. After the gate valve is opened and the gate seat is away from the sealing arc block by a specified degree, the first double-headed motor drives the sealing rubber cylinder and the sealing arc block to perform a revolution movement. On the one hand, this movement can reduce the adhesion rate of debris on the sealing rubber cylinder and the sealing arc block during the medium flow, and reduce the clearance rate between the gate seat and the sealing components when the gate seat is closed; on the other hand, it can rotate and scrape or scrape out the blockage between the gate seat and the sealing arc block during the medium flow, effectively reducing the debris residue rate, ensuring the high sealing degree of the gate valve, fundamentally solving the problem of debris affecting the seal, and having innovation compared with the existing gate valves; The pressure regulating component of the present invention can flexibly control the pressurization amplitude of the pressurization chamber according to the actual working conditions. The pressure regulating component drives the drum pressing plate to move through a bidirectional lead screw, changes the volume of the drum pressing chamber, thereby controlling the pressure charged into the sealing ring bladder. The one-way air outlet valve, pressure relief valve and first pressure gauge installed on the pressure supply pipe can monitor and control the pressure in real time, ensuring good sealing effects under different pressure media. This enables the present invention to adapt to media with different pressures, effectively solving the problem of poor pressure adaptability of the existing gate valves, and providing a reliable guarantee for the application in different pressure environments in industrial production; The pressure balance component of the present invention effectively solves the problems of short service life and unsmooth opening and closing of the gate seat of the existing gate valves. The pressure balance pipe introduces the pressures of the medium inlet pipe and the medium outlet pipe into the pressure balance chamber, and uses a one-way liquid inlet valve to prevent liquid backflow, so that the pressure in the pressure balance chamber is balanced with the pressure in the pipeline, reducing the pressure difference on both sides of the gate seat, reducing 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 the existing gate valves; While driving the displacement of the gate seat, the electric drive mechanism of the present invention can make the rotating body rotate. After the rotating body rotates, through the cooperation with the valve housing, the dirt remaining on the two sealing gate surfaces is fully scraped out in a rotating scraping manner, ensuring the cleanliness of the sealing gate surfaces, effectively solving the problem of difficult cleaning of the sealing gate surfaces, and further improving the sealing performance and overall working effect of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a high-performance double-sealing knife gate valve of the present invention; Figure 2 For the present invention Figure 1 is a partially enlarged structural diagram at A in Figure 3 For the present invention Figure 1 is a partially enlarged structural diagram at B in Figure 4 For the present invention Figure 1 is a sectional structural diagram of Figure 5 For the present invention Figure 4 Schematic diagram of the locally enlarged structure at C in the present invention; Figure 6 For the present invention Figure 4 Schematic diagram of the locally enlarged structure at D in the present invention; Figure 7 Schematic diagram of the structure of the pressure balance pipe and the bracket of the present invention; Figure 8 Schematic diagram of the structure of the sealing rubber cylinder and the sealing arc block of the present invention; Figure 9 Schematic diagram of the structure of the mandrel and the inner shaft of the present invention; Figure 10 Schematic diagram of the structure of the valve seat of the present invention; Figure 11 Schematic diagram of the structure of the bidirectional lead screw and the drum pressing plate of the present invention; Figure 12 Schematic diagram of the structure of the rotating body of the present invention.

[0015] 1. Valve housing; 2. Medium inlet pipe; 3. Medium outlet pipe; 4. Sealing rubber cylinder; 5. Sealing arc block; 6. Valve seat; 7. Rotating body; 8. Sealing gate surface; 9. Sealing ring capsule; 10. Pressurizing chamber; 11. Pressure balance chamber; 12. First double-headed motor; 13. Hydraulic blade; 14. Synchronous shaft; 15. Bracket; 16. Transmission screw sleeve; 17. Screw pipe; 18. Inner shaft; 19. Mandrel; 20. Second double-headed motor; 21. Drum pressing housing; 22. Bidirectional lead screw; 23. Motor; 24. Drum pressing plate; 25. Unidirectional air inlet valve; 26. Pressure delivery pipe; 27. Pressure passage; 28. Pressure distribution ring; 29. Rotary joint; 30. Unidirectional 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. Single-chip microcomputer. Detailed implementation manners

[0016] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be thought of by those skilled in the art.

[0017] As Figures 1 - 12 shown, a high-performance double-sealing knife gate valve includes a valve housing 1, and a medium inlet pipe 2 and a medium outlet pipe 3 are respectively communicated at both ends of the valve housing 1. Flange connection surfaces are provided on both the medium inlet pipe 2 and the medium outlet pipe 3; Two sealing rubber cylinders 4 are respectively rotatably installed in the medium inlet pipe 2 and the medium outlet pipe 3; A sealing arc block 5 is installed between the two sealing rubber cylinders 4; A rotation driving device drives the sealing rubber cylinder 4 to rotate; The sealing rubber tube 4 and the sealing arc block 5 are both made of silicone material. The sealing rubber tube 4 is a hollow cylindrical structure with openings at both ends. The central angle of the sealing arc block 5 is 180°. A sealing groove adapted to the sealing arc block 5 is fixedly provided at the bottom of the gate seat 6. The sealing arc block 5 is arranged directly below the gate seat 6. The silicone material has good flexibility and sealing properties, and can better fit the inner wall of the pipe and the gate seat 6, effectively preventing medium leakage; The matching 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, thereby improving the overall sealing performance of the valve. When the gate valve is closed, the sealing arc block 5 is arranged directly below the gate seat 6, and the sealing arc block 5 faces the sealing groove. When the gate seat 6 is closed, the sealing groove and the sealing arc block 5 are sealed and fitted, thereby sealing the gate valve. When the gate valve is in an open state, and the gate seat 6 is 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, and then the first double-headed motor 12 is turned on. After the first double-headed motor 12 is turned on, the sealing rubber cylinder 4 and the sealing arc block 5 are driven to perform an orbital motion. The orbital motion of the sealing rubber cylinder 4 and the sealing arc block 5 can effectively reduce the adhesion rate of impurities in the medium on the sealing rubber cylinder 4 and the sealing arc block 5 when the medium flows, and then reduce 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; On the other hand, the revolution of the sealing rubber cylinder 4 and the sealing arc block 5 can scrape or remove the blockage between the gate seat 6 and the sealing arc block 5 by rotation 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, thereby ensuring the high sealing degree of the gate valve; The rotary drive device includes a first double-headed motor 12 installed on the medium outlet pipe 3, an encoder is integrated on the first double-headed motor 12, a group of water dynamic blades 13 distributed in a circumferential array are installed at one output shaft end of the first double-headed motor 12 and at a position corresponding to the inner side of the medium outlet pipe 3, a synchronous shaft 14 is rotatably installed in the valve housing 1, a first synchronous toothed belt is connected between the other output shaft end of the first double-headed motor 12 and the synchronous shaft 14, a sealing rubber cylinder 4 and the synchronous shaft 14 are both installed with first bevel teeth, and the two first bevel teeth are meshed with each other; The beneficial effect of adopting the above solution is that the encoder can accurately control the rotation angle and speed of the first double-headed motor 12, thereby accurately controlling the number of rotations and the rotation angle of the sealing rubber cylinder 4; Preferably, when the first double-headed motor 12 rotates, the number of rotations of the first double-headed motor 12 should be a full number of rotations. When the gate valve is about to be closed, the number of output turns of the first double-headed motor 12 should be set to ensure that the sealing arc block 5 is set directly below the sealing groove. Subsequently, the gate seat 6 moves downward to complete the closing of the gate valve and the fitting of the sealing groove and the sealing arc block 5. The water impeller 13 uses the power generated by the medium flow to assist the first double-headed motor 12 in driving, which can reduce the motor energy consumption and improve the energy utilization efficiency when the medium flows. At the same time, this structural design makes the driving of the sealing rubber cylinder 4 more stable and reliable; A gate seat 6 is slidably mounted in the valve housing 1; A slide rail for guiding the gate seat 6 is provided in the valve housing 1; A rotating body 7 is rotatably mounted on the gate seat 6, and a sealing gate surface 8 is arranged at both ends of the rotating body 7, and a sealing ring capsule 9 is installed on the two sealing gate surfaces 8. A pressure chamber 10 is provided inside the two rotating bodies 7, and the two pressure chambers 10 are respectively connected to the inner chambers of the two sealing ring capsules 9; A pressure regulating component, used to control the pressure range of the pressure chamber 10; The beneficial effect of adopting the above scheme is that when the gate seat 6 is in a moving state before closing, the gas inside the sealing ring bag 9 is fully emptied through the pressure relief valve 31. When the gate seat 6 is completely closed, the pressure regulating component fully pressurizes the two pressure charging chambers 10. After the two pressure charging chambers 10 are fully pressurized, the sealing ring bag 9 is inflated and expanded. After the sealing ring bag 9 is inflated and expanded, the gap between the sealing gate surface 8 and the sealing rubber cylinder 4 is further inflated and sealed, thereby improving the sealing strength of the connection between the gate seat 6 and the medium inlet pipe 2 and the medium outlet pipe 3. The pressure balance chamber 11 is opened in the gate seat 6 and arranged between the two sealing gate surfaces 8; A pressure balancing component, used for balancing the pressure in the pressure balancing chamber 11; The electric drive mechanism is used to drive the gate seat 6 to move and the rotating body 7 to rotate.

[0018] The electric drive mechanism includes a bracket 15 mounted on the valve housing 1, a transmission screw sleeve 16 is rotatably mounted on the valve housing 1, a screw tube 17 is threadedly mounted on the inner wall of the transmission screw sleeve 16, the bottom end of the screw tube 17 is rotatably connected to the gate seat 6 through a bearing, an inner shaft 18 is rotatably mounted on the inner wall of the screw tube 17, a second bevel gear is mounted on the bottom end of the inner shaft 18 and the rotating body 7, the two second bevel gears are meshed with each other, a core shaft 19 is rotatably mounted on the bracket 15, and the inner shaft 18 is driven by the core shaft 19; The inner shaft 18 is fixedly provided with an axis groove with an opening at the top and slidably connected to the core shaft 19. The cross sections of the axis groove and the core shaft 19 are both regular hexagons. A second double-headed motor 20 is installed on the bracket 15, and a second synchronous toothed belt is connected between one output shaft end of the second double-headed motor 20 and the transmission screw sleeve 16, and the other output shaft end of the second double-headed motor 20 is connected to the core shaft 19 through a third synchronous toothed belt.

[0019] The beneficial effects of adopting the above solution are as follows: during operation, the second double-headed motor 20 can drive the gate seat 6 to move up or down at a set speed by driving the transmission sleeve 16. At the same time, when the second double-headed motor 20 operates, the rotating body 7 rotates. After the rotating body 7 rotates, through cooperation with the valve housing 1, the dirt remaining on the two sealing gate surfaces 8 is fully scraped out by means of rotational scraping, thereby ensuring the cleanliness of the two sealing gate surfaces 8; The pressure regulating assembly includes a pressure drum housing 21 installed on the side of the valve housing 1. A bidirectional lead screw 22 is rotatably installed on the inner wall of the pressure drum housing 21. A motor 23 is installed on the pressure drum housing 21, and the output shaft end of the motor 23 is fixedly connected to the bidirectional lead screw 22. A positive thread section and a reverse thread section are respectively provided on the bidirectional lead screw 22. A pressure drum plate 24 is drivingly installed on both the positive thread section and the reverse thread section. A pressure drum chamber is provided between the two pressure drum plates 24 and corresponding to the inner side of the pressure drum housing 21. A one-way intake valve 25 communicated with the pressure drum chamber is fixedly installed on the pressure drum housing 21. A pressure delivery pipe 26 is communicated with the top of the pressure drum chamber. A pressure flow channel 27 with both ends open is fixedly opened inside the core shaft 19. The other end of the pressure delivery pipe 26 is rotatably communicated with the pressure flow channel 27. A pressure distribution ring 28 is fixedly installed inside the gate seat 6. The inner cavity of the pressure distribution ring 28 is respectively rotatably communicated with the two pressurizing chambers 10. The top end of the pressure distribution ring 28 is fixedly communicated with a rotary joint 29. The bottom end of the pressure flow channel 27 is communicated with the rotary joint 29 through an axial groove.

[0020] The pressure regulating assembly controls the pressurizing amplitude of the pressurizing chamber 10 through components such as the bidirectional lead screw 22, the pressure drum plate 24, and the pressure drum chamber. The bidirectional lead screw 22 drives the pressure drum plate 24 to move, changing the volume of the pressure drum chamber, and thus controlling the pressure charged into the sealing ring bladder 9; This design can flexibly adjust the pressure of the sealing ring bladder 9 according to the actual working conditions, ensuring good sealing effects under different pressure media. The one-way outlet valve 30, the pressure relief valve 31, and the 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 pressurizing process; A one-way outlet valve 30, a pressure relief valve 31, and a first pressure gauge 32 are respectively installed on the pressure delivery pipe 26. A first corrugated section is fixedly provided on the pressure delivery pipe 26.

[0021] Through the setting of the one-way outlet valve 30, it is ensured that the gas sent out by the pressure delivery pipe 26 flows out unidirectionally through the pressure drum chamber. Through the setting of the pressure relief valve 31, the gas in the pressurizing chamber 10 or the air pressure in the pressure delivery pipe 26 is discharged. Through the setting of the first pressure gauge 32, the internal pressure in the pressurizing chamber 10 is monitored in real time; The pressure balance assembly includes a pressure balance pipe 33 installed on the medium inlet pipe 2 and the medium outlet pipe 3. A pressure balance ring 34 is rotatably installed on the screw pipe 17. The two pressure balance pipes 33 are both communicated with the inner cavity of the pressure balance ring 34. A one-way inlet valve is provided at the connection between the two pressure balance pipes 33 and the pressure balance ring 34. An annular channel 35 is fixedly opened inside the screw pipe 17. The inner cavity of the screw pipe 17 is rotationally communicated with the annular channel 35. The bottom end of the annular channel 35 is communicated with the pressure balance chamber 11. Second corrugated sections are provided on both pressure balance pipes 33.

[0022] The pressure balance assembly further includes a second pressure gauge 36 installed on the medium inlet pipe 2 and the medium outlet pipe 3. A single-chip microcomputer 37 is installed on the valve housing 1. The data terminals of the first pressure gauge 32 and the second pressure gauge 36 are both connected to the single-chip microcomputer 37 for data connection.

[0023] The pressures of the medium inlet pipe 2 and the medium outlet pipe 3 are introduced into the pressure balance chamber 11 through the pressure balance pipe 33. The one-way inlet valve is used to prevent the liquid from flowing back, so that the pressure in the pressure balance chamber 11 is kept balanced with the pressure in the pipeline. This can effectively reduce the pressure difference on both sides of the valve seat 6, reduce the pressure received by the valve seat 6, extend the service life of the valve seat 6, and improve the smoothness of the valve opening and closing at the same time. The second pressure gauge 36 cooperates with the single-chip microcomputer 37 to monitor the pipeline pressure change in real time, so as to adjust the pressure balance in time and enhance the stability and reliability of the system.

[0024] The working principle of the present invention is as follows: When the gate valve is in the open state, when the valve 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 communicated. At this time, the first double-headed motor 12 is started. The encoder integrated on the first double-headed motor 12 precisely controls its rotation angle and speed, and then precisely controls the number of rotation turns and the angle of the sealing rubber cylinder 4. And the number of rotation turns of the motor is guaranteed to be an integer number of turns. The motor drives the water moving blade 13, and uses the power generated by the medium flow to assist in driving. At the same time, the synchronous shaft 14 is driven by the first synchronous toothed belt, and then the sealing rubber cylinder 4 and the sealing arc block 5 perform a revolution movement through the first bevel gear transmission. This movement can, on the one hand, reduce the adhesion rate of medium debris on the sealing rubber cylinder 4 and the sealing arc block 5, reduce the clearance rate when the valve seat 6 is closed, and on the other hand, can scrape the blockage between the valve seat 6 and the sealing arc block 5 to ensure the high sealing degree of the gate valve; Before the gate valve is about to be closed, by setting the number of output turns of the first double-headed motor 12, it is ensured that the sealing arc block 5 is located directly below the sealing groove. Then the valve seat 6 moves downward, and the sealing groove is hermetically attached to the sealing arc block 5 to complete the closing of the gate valve; When the valve seat 6 is in the moving state before closing, the gas inside the sealing ring capsule 9 is fully emptied through the pressure relief valve 31; After the gate seat 6 is completely closed, the pressure regulating assembly starts to work. The motor 23 drives the bidirectional lead screw 22 to rotate. The positive thread section and the reverse thread section on the bidirectional lead screw 22 drive the two drum pressing plates 24 to move, changing the volume of the drum pressing chamber. Air is inhaled through the one-way intake valve 25, and the gas is sent into the pressure flow channel 27 of the mandrel 19 through the pressure delivery pipe 26, and then enters the pressure distribution ring 28 through the shaft groove and the rotary joint 29, and sufficient pressure is applied to the two pressure charging chambers 10. The sealing ring bladder 9 is inflated, and the gap between the sealing gate surface 8 and the sealing rubber cylinder 4 is sealed by inflating, improving the sealing strength at the connection between the gate seat 6 and the medium inlet pipe 2 and the medium outlet pipe 3; The one-way outlet valve 30 on the pressure delivery pipe 26 ensures the unidirectional outflow of the gas. The pressure relief valve 31 can discharge the air pressure in the pressure charging chamber 10 or the pressure delivery pipe 26. The first pressure gauge 32 monitors the internal pressure in the pressure charging chamber 10 in real time. During the whole process, the pressure balance assembly plays a role. The pressure balance pipes 33 on the medium inlet pipe 2 and the medium outlet pipe 3 introduce the pipeline pressure into the pressure balance chamber 11. The one-way inlet liquid valve prevents the liquid from flowing back. The second corrugated section on the pressure balance pipe 33 can adapt to a certain pressure change. The pressure balance ring 34 rotatably installed on the screw pipe 17 is communicated with the pressure balance pipe 33. The pressure balance ring 34 is communicated with the inner cavity of the screw pipe 17 through the annular channel 35 and finally communicated with the pressure balance chamber 11. The second pressure gauges 36 on the medium inlet pipe 2 and the medium outlet pipe 3 cooperate with the single-chip microcomputer 37 on the valve housing 1 to monitor the pipeline pressure change 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 the valve opening and closing; In terms of the electric drive mechanism, when the second double-headed motor 20 works, on the one hand, it drives the transmission screw sleeve 16 through the second synchronous toothed belt, so that the gate seat 6 moves up or down at a set speed. On the other hand, the other output shaft of the second double-headed motor 20 drives the mandrel 19 through the third synchronous toothed belt. The mandrel 19 drives the inner shaft 18. The second bevel gear at the bottom end of the inner shaft 18 meshes with the second bevel gear on the rotating body 7, so that the rotating body 7 rotates. Through the cooperation with the valve housing 1, the dirt remaining on the two sealing gate surfaces 8 is scraped off, ensuring the cleanliness of the sealing gate surfaces 8; When the rotating body 7 rotates, the sealing gate surface 8 rubs against the inner wall of the valve housing 1 to scrape off the remaining dirt.

[0025] The above shows and describes 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 by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-performance double-seal knife gate valve, comprising a valve housing (1), wherein two ends of the valve housing (1) are respectively connected to a medium inlet pipe (2) and a medium outlet pipe (3), and characterized in that: Also includes: Two sealing rubber cylinders (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 the two sealing rubber cylinders (4); A rotary drive device drives the sealing rubber cylinder (4) to rotate, a gate seat (6) is slidably mounted in the valve housing (1), a rotating body (7) is rotatably mounted on the gate seat (6), a sealing gate surface (8) is arranged at both ends of the rotating body (7), a sealing ring capsule (9) is mounted on each of the two sealing gate surfaces (8), a pressure chamber (10) is provided inside each of the two rotating bodies (7), and the two pressure chambers (10) are respectively connected to the inner chambers of the two sealing ring capsules (9); A pressure regulating component, used to control the pressure range of the pressure-charging chamber (10); A pressure balance chamber (11) is opened in the gate seat (6) and arranged between the two sealing gate surfaces (8); a pressure balance component is used for balancing the pressure in the pressure balance chamber (11); The electric drive mechanism is used to drive the gate seat (6) to move and the rotating body (7) to rotate.

2. A high performance double seal knife gate valve according to claim 1, characterized in that: The rotary drive device comprises a first double-headed motor (12) mounted on the medium outlet pipe (3), an encoder being integrated on the first double-headed motor (12), a group of water dynamic blades (13) distributed in a circumferential array being mounted on one output shaft end of the first double-headed motor (12) and corresponding to the position inside the medium outlet pipe (3), a synchronous shaft (14) being rotatably mounted in the valve housing (1), a first synchronous toothed belt being transmission-connected between the other output shaft end of the first double-headed motor (12) and the synchronous shaft (14), and first bevel teeth being mounted on both the sealing rubber cylinder (4) and the synchronous shaft (14), and two of the first bevel teeth being meshed with each other.

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

4. A high performance double seal knife gate valve according to claim 1, characterized in that: The electric drive mechanism comprises a bracket (15) mounted on the valve housing (1); a transmission screw sleeve (16) is rotatably mounted on the valve housing (1); a screw tube (17) is threadedly mounted on the inner wall of the transmission screw sleeve (16); the bottom end of the screw 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 screw tube (17); a second bevel tooth is mounted on the bottom end of the inner shaft (18) and the rotating body (7); the two second bevel teeth are meshed with each other; a core shaft (19) is rotatably mounted on the bracket (15); the inner shaft (18) is driven by the core shaft (19); a second double-headed motor (20) is mounted on the bracket (15); a second synchronous toothed belt is transmission-connected between one output shaft end of the second double-headed motor (20) and the transmission screw sleeve (16); and the other output shaft end of the second double-headed motor (20) is transmission-connected to the core shaft (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) is fixedly provided with an axis groove with a top opening and slidably connected to the core shaft (19); the cross sections of the axis groove and the core shaft (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 comprises a drum pressure shell (21) mounted on the side of the valve housing (1), a bidirectional screw rod (22) being rotatably mounted on the inner wall of the drum pressure shell (21), a motor (23) being mounted on the drum pressure shell (21), an output shaft end of the motor (23) being fixedly connected to the bidirectional screw rod (22), the bidirectional screw rod (22) being respectively provided with a positive thread section and a negative thread section, a drum pressure plate (24) being rotatably mounted on the positive thread section and the negative thread section, a drum pressure chamber being arranged between the two drum pressure plates (24) and corresponding to the inner side of the drum pressure shell (21), the drum pressure shell (21) being fixedly provided with a drum pressure chamber. A one-way air inlet valve (25) connected to the drum pressure chamber is installed. The top of the drum pressure chamber is connected to a pressure supply pipe (26). A pressure channel (27) with two ends open is fixedly provided inside the core shaft (19). The other end of the pressure supply pipe (26) is rotatably connected to the pressure channel (27). A cloth pressure ring (28) is fixedly installed inside the gate seat (6). The inner cavity of the cloth pressure ring (28) is rotatably connected to the two pressure chambers (10). The top of the cloth pressure ring (28) is fixedly connected to a rotary joint (29). The bottom end of the pressure channel (27) is connected to the rotary joint (29) through an axis groove.

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

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

9. A high performance double seal knife gate valve according to claim 8, characterized in that: The pressure balancing assembly further comprises a second pressure gauge (36) mounted on the medium inlet pipe (2) and the medium outlet pipe (3); a single chip microcomputer (37) is mounted on the valve housing (1); and data terminals of the first pressure gauge (32) and the second pressure gauge (36) are both data-connected to the single chip microcomputer (37).

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