Hydraulic self-closing butterfly valve

Abstract

The invention belongs to the technical field of butterfly valves, and particularly relates to a hydraulic self-closing butterfly valve which comprises a valve shell, a bearing sealing sleeve is welded to the outer wall of the top of the valve shell, a gear box is fixedly connected to the outer wall of the top of the bearing sealing sleeve through a flange, and a valve pipe is rotationally connected to the inner wall of the bottom of the gear box. The valve pipe is rotationally connected to the inner wall of the bearing sealing sleeve through a bearing. Through the synergistic effect of the gas storage bottle and the airflow conversion assembly, when the sealing plate rotates to the maximum sealing angle, namely the sealing plate is in a closed state, compressed gas in the gas storage bottle enters the upper gas cavity through the gas inlet pipe, flows into the valve pipe through an alignment channel of the upper vent hole and the lower vent hole and is finally injected into the annular compensation gas bag through the gas blowing hole in the bottom of the valve pipe; the annular compensation air bag expands after being inflated and can be tightly attached to the inner wall of the lining, a tiny gap between the sealing plate and the valve shell is completely filled, complete sealing is achieved, the limitation of traditional static sealing is solved, and the valve is particularly suitable for the high-pressure fluid environment.

Description

Technical Field

[0001] This invention relates to the field of butterfly valve technology, and more particularly to a hydraulically self-closing butterfly valve. Background Technology

[0002] Hydraulic self-closing butterfly valves are fluid control devices widely used in water conservancy projects, petrochemical industries, and urban water supply. Their core function is to regulate or cut off fluid flow in pipelines by rotating the valve plate (i.e., the sealing plate). Traditional butterfly valves rely on mechanical seals, such as rubber rings or metal-to-metal contact seals. However, with prolonged use, sealing performance gradually declines due to material wear, temperature changes, or pressure fluctuations. Even when the valve is fully closed, tiny gaps between the sealing surfaces can still cause fluid leakage. This not only wastes energy but can also pose safety hazards. For example, in chemical pipelines, leaked harmful fluids can threaten the environment and human health.

[0003] The shortcomings of existing technologies are mainly reflected in the following aspects: First, the static sealing design of traditional butterfly valves is difficult to adapt to pressure changes under dynamic operating conditions. For example, under the impact of high-pressure fluid, the sealing ring is prone to deformation or displacement, leading to sealing failure. Second, existing butterfly valves lack a real-time compensation mechanism. Once the sealing element wears or ages, it must be shut down for replacement, affecting the continuous operation of the system. In addition, although some improved butterfly valves attempt to use elastic materials or multi-layer sealing structures, the structure is complex, the maintenance cost is high, and the dynamic sealing problem is not fundamentally solved. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a hydraulic self-closing butterfly valve, which overcomes the shortcomings of the prior art and effectively solves the problem that the sealing performance of the butterfly valve will gradually decline due to material wear, temperature changes or pressure fluctuations during long-term use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulically self-closing butterfly valve includes a valve body, a bearing sealing sleeve welded to the top outer wall of the valve body, and a gearbox fixedly connected to the top outer wall of the bearing sealing sleeve via a flange. A valve pipe is rotatably connected to the bottom inner wall of the gearbox, and the valve pipe is rotatably connected to the inner wall of the bearing sealing sleeve via a bearing. A sealing plate is welded to the bottom outer wall of the valve pipe, and an annular compensating airbag is adhered to the outer wall of the sealing plate. An air blowing hole is opened at the bottom of the outer wall of the valve pipe. An air storage bottle is provided at the top of one side of the outer wall of the gearbox, and an air inlet pipe is fixedly connected to the outer wall of one end of the air storage bottle. An airflow conversion assembly is provided between the air inlet pipe and the valve pipe.

[0007] A sleeve is welded to the outer wall of the other side of the gearbox, and a U-shaped frame is fixedly connected to one end of the outer wall of the sleeve via a flange. A first bevel gear is installed on the top of the outer wall of the valve pipe, and a second bevel gear meshes on the outer wall of the first bevel gear. A connecting rod is welded to the inner wall of the second bevel gear, and a connecting seat is fixedly connected to one end of the outer wall of the connecting rod. A hydraulic push rod is hinged between the connecting seat and the U-shaped frame.

[0008] Through the above-described scheme, the gas cylinder and the airflow conversion component work together to allow compressed gas in the gas cylinder to enter the upper air chamber through the inlet pipe when the sealing plate rotates to the maximum sealing angle, i.e., the closed state. The compressed gas then flows into the valve pipe through the aligned channel of the upper and lower vent holes, and finally into the annular compensation airbag through the blowing hole at the bottom of the valve pipe. After the annular compensation airbag is inflated, it expands and can tightly fit the inner wall of the bushing, completely filling the tiny gaps between the sealing plate and the valve body, achieving a complete seal. This solves the limitations of traditional static sealing and is especially suitable for high-pressure fluid environments.

[0009] Preferably, the airflow conversion assembly includes a lower air chamber, an upper air chamber, an annular pipe, a lower vent, an upper vent, an exhaust port, an exhaust chamber, and an exhaust head. The lower air chamber is fixedly connected to the top outer wall of the valve pipe, the upper air chamber is tightly attached to the top outer wall of the lower air chamber, the annular pipe is fixedly connected to the outer wall of the upper air chamber, the lower vent is opened on the top outer wall of the lower air chamber, the upper vent is opened on the bottom outer wall of the upper air chamber, and the upper vent and the lower vent correspond one-to-one. The exhaust port is opened on one side outer wall of the lower air chamber, the exhaust chamber is disposed on one side outer wall of the annular pipe, and the exhaust head is welded to one side outer wall of the exhaust chamber.

[0010] With the above solution, when the sealing plate turns to the open state, that is, when the cross-sectional area of ​​the fluid channel is increased, the valve pipe rotates with the drive of the hydraulic push rod, which drives the lower air chamber and the upper air chamber in the airflow conversion component to move relative to each other, so that the lower vent and the upper vent are far apart. The gas in the annular compensation airbag enters the exhaust chamber through the exhaust port, and is finally discharged quickly through the vertically distributed exhaust head. After the annular compensation airbag contracts, it avoids obstructing the fluid flow, and at the same time reduces the fatigue damage caused by long-term pressure on the annular compensation airbag, thus extending its service life.

[0011] Preferably, the upper air chamber is fixedly connected to the bottom outer wall of the air intake pipe, the lower air chamber is slidably connected to the inner wall of the annular pipe, and the exhaust head and exhaust hole are vertically distributed.

[0012] Preferably, the connecting rod is rotatably connected to the inner wall of the U-shaped frame, and the connecting seat is located inside the U-shaped frame, with the connecting rod passing through the inside of the sleeve.

[0013] With the above solution, the connecting rod and the second bevel gear are fixed by welding to ensure that the transmission torque is lossless. The inner wall of the U-shaped frame is equipped with a self-lubricating copper sleeve to reduce the friction of the connecting rod rotation.

[0014] Preferably, a pointer is welded to the outer wall of the end of the connecting rod away from the second bevel gear, and a scale is welded to the outer wall of one side of the U-shaped frame. The pointer points to the scale line of the scale. Adjacent limit blocks are welded to the outer wall of one side of the scale, and the pointer is located between two limit blocks. The included angle between the two limit blocks is 90°.

[0015] Through the above scheme, the linkage between the first and second bevel gears in the bevel gear transmission structure and the hydraulic push rod can precisely adjust the rotation angle of the sealing plate. The design of the dial and pointer allows the operator to monitor the valve opening in real time, and the limit block limits the rotation range of the pointer to 90° to prevent overload. The electronic controller integrates the control of the hydraulic push rod, pressure gauge and solenoid valve to realize automated operation and significantly improve system stability. The distance between the pointer and the scale line of the dial is 90°. The limit block is fixed to the side wall of the U-shaped frame by laser welding. The included angle between the two limit blocks is 90°, corresponding to the stroke from fully open to fully closed of the valve.

[0016] Preferably, the valve housing includes a valve body and a bushing, wherein the bearing sealing sleeve is welded to the top inner wall of the valve body, the bushing is installed on the inner wall of the valve body, and the annular compensation airbag is tightly attached to the inner wall of the bushing.

[0017] Preferably, a positioning post is welded to the bottom outer wall of the sealing plate, and the positioning post is rotatably connected to the bottom inner wall of the bushing.

[0018] With the above method, the positioning pin is inserted into the precision bearing at the bottom of the bushing, preventing the sealing plate from shifting radially.

[0019] Preferably, a pressure gauge is installed on the outer wall of the top of the gas cylinder, and a gas supply pipe is fixedly connected to the outer wall of the other end of the gas cylinder, with a solenoid valve installed on the outer wall of the gas supply pipe.

[0020] The above scheme uses carbon fiber composite material for the gas cylinder, with a working pressure of 0.8-1.2MPa. The end of the gas supply pipe is connected to an external gas source, and the solenoid valve is normally closed. When the pressure gauge detects that the pressure of the gas cylinder is lower than the set value, the controller automatically opens the solenoid valve to supply gas.

[0021] Preferably, a support plate is welded to the outer wall of the other side of the gearbox, and the gas storage cylinder is fixedly connected to the top outer wall of the support plate by screws.

[0022] Preferably, an electronic controller is fixedly connected to one outer wall of the gearbox by screws, and the electronic controller is connected to the hydraulic push rod, the pressure gauge and the solenoid valve by signal lines.

[0023] Through the above solution, the electronic controller integrates the control of the hydraulic push rod, air pressure gauge and solenoid valve to achieve automated operation and improve system stability.

[0024] The beneficial effects of this invention are as follows:

[0025] 1. The hydraulic self-closing butterfly valve of the present invention, through the synergistic action of the gas storage cylinder and the airflow conversion component, when the sealing plate rotates to the maximum sealing angle, i.e. the closed state, the compressed gas in the gas storage cylinder enters the upper air chamber through the air inlet pipe, flows into the valve pipe through the aligned channel of the upper and lower air vents, and finally is injected into the annular compensation airbag through the air blowing hole at the bottom of the valve pipe. After the annular compensation airbag is inflated, it can tightly fit the inner wall of the bushing, completely fill the tiny gap between the sealing plate and the valve body, achieve complete sealing, solve the limitations of traditional static sealing, and is especially suitable for high pressure fluid environment;

[0026] 2. In the hydraulic self-closing butterfly valve of the present invention, when the sealing plate turns to the open state, that is, when the cross-sectional area of ​​the fluid channel is increased, the valve pipe rotates with the drive of the hydraulic push rod, which drives the lower air chamber and the upper air chamber in the airflow conversion component to move relative to each other, so that the lower vent and the upper vent are far apart. The gas in the annular compensation airbag enters the exhaust chamber through the exhaust port, and is finally discharged quickly through the vertically distributed exhaust head. After the annular compensation airbag contracts, it avoids obstructing the fluid flow, and at the same time reduces the fatigue damage of the annular compensation airbag caused by long-term pressure, thus extending its service life.

[0027] 3. The hydraulic self-closing butterfly valve of the present invention, through the linkage between the first bevel gear and the second bevel gear in the bevel gear transmission structure and the hydraulic push rod, can accurately adjust the rotation angle of the sealing plate. The design of the dial and pointer allows the operator to monitor the valve opening in real time, and the limit block limits the rotation range of the pointer to 90° to prevent overload. The electronic controller integrates the control of the hydraulic push rod, the pressure gauge and the solenoid valve to realize automated operation and significantly improve the stability of the system. Attached Figure Description

[0028] Figure 1 This is a front view of the overall structure of a hydraulically self-closing butterfly valve proposed in this invention.

[0029] Figure 2 This is a rear view of the overall structure of a hydraulically self-closing butterfly valve proposed in this invention.

[0030] Figure 3 This is a schematic diagram of the internal connection structure of the gearbox of a hydraulic self-closing butterfly valve proposed in this invention.

[0031] Figure 4 This is an enlarged schematic diagram of part A of the hydraulic self-closing butterfly valve proposed in this invention;

[0032] Figure 5 This is a schematic diagram of the internal structure of the valve shell of a hydraulically self-closing butterfly valve proposed in this invention.

[0033] Figure 6This is a schematic diagram showing the disassembled structure of the valve pipe and sealing plate of a hydraulic self-closing butterfly valve proposed in this invention.

[0034] Figure 7 This invention provides a schematic diagram of the disassembled structure of the airflow conversion component of a hydraulically self-closing butterfly valve. Figure 1 ;

[0035] Figure 8 This invention provides a schematic diagram of the disassembled structure of the airflow conversion component of a hydraulically self-closing butterfly valve. Figure 2 ;

[0036] Figure 9 This is a schematic diagram of the airflow conversion component connection structure of a hydraulic self-closing butterfly valve proposed in this invention;

[0037] Figure 10 This is a schematic diagram of the U-shaped frame connection structure of a hydraulic self-closing butterfly valve proposed in this invention;

[0038] Figure 11 This is an enlarged schematic diagram of part B of a hydraulically self-closing butterfly valve proposed in this invention.

[0039] In the diagram: 1. Valve housing; 2. Bearing seal sleeve; 3. Gearbox; 4. Valve pipe; 5. Sealing plate; 6. Annular compensating airbag; 7. Air inlet; 8. Airflow conversion assembly; 81. Lower air chamber; 82. Upper air chamber; 83. Annular pipe; 84. Lower vent; 85. Upper vent; 86. Exhaust port; 87. Exhaust chamber; 88. Exhaust head; 9. Inlet pipe; 10. Gas cylinder; 11. Sleeve; 12. U-shaped frame; 13. First bevel gear; 14. Second bevel gear; 15. Connecting rod; 16. Connecting seat; 17. Hydraulic push rod; 18. Pointer; 19. Dial; 20. Limit block; 21. Valve body; 22. Bushing; 23. Positioning pin; 24. Pressure gauge; 25. Air supply pipe; 26. Solenoid valve; 27. Support plate; 28. Electronic controller. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Reference Figures 1-11Example 1: A hydraulically self-closing butterfly valve includes a valve body 1. A bearing sealing sleeve 2 is welded to the top outer wall of the valve body 1. A gearbox 3 is fixedly connected to the top outer wall of the bearing sealing sleeve 2 via a flange. A valve pipe 4 is rotatably connected to the bottom inner wall of the gearbox 3. The valve pipe 4 is rotatably connected to the inner wall of the bearing sealing sleeve 2 via a bearing. A sealing plate 5 is welded to the bottom outer wall of the valve pipe 4. An annular compensating airbag 6 is adhered to the outer wall of the sealing plate 5. An air blowing hole 7 is opened at the bottom of the outer wall of the valve pipe 4. An air storage bottle 10 is provided at the top of one side of the outer wall of the gearbox 3. An air inlet pipe 9 is fixedly connected to the outer wall of one end of the air storage bottle 10. An airflow conversion assembly 8 is provided between the air inlet pipe 9 and the valve pipe 4.

[0042] The valve housing 1 consists of a valve body 21 and a bushing 22. The valve body 21 is made of ductile iron, and the inner bushing 22 is made of fluororubber, which is highly corrosion-resistant. The bearing seal sleeve 2 is welded to the top of the valve body 21, and a high-precision bearing is installed on its inner wall to ensure smooth rotation of the valve pipe 4. The gearbox 3 is fixed to the bearing seal sleeve 2 via a flange, and the valve pipe 4 inside the bearing seal sleeve 2 is welded to the sealing plate 5 as a whole. The annular compensation airbag 6 is made of nitrile rubber and is fixed to the outer edge of the sealing plate 5 with a high-temperature resistant adhesive. After inflation, its thickness can reach 3-5mm, which can fully compensate for the sealing gap.

[0043] In this embodiment, through the synergistic effect of the gas storage cylinder 10 and the airflow conversion component 8, when the sealing plate 5 is rotated to the maximum sealing angle, i.e., the closed state, the compressed gas in the gas storage cylinder 10 enters the upper air chamber 82 through the air inlet pipe 9, flows into the valve pipe 4 through the aligned channel of the upper vent hole 85 and the lower vent hole 84, and is finally injected into the annular compensation airbag 6 through the blowing hole 7 at the bottom of the valve pipe 4. After the annular compensation airbag 6 is inflated, it expands and can tightly fit the inner wall of the bushing 22, completely filling the tiny gap between the sealing plate 5 and the valve body 1, achieving a complete seal, solving the limitations of traditional static sealing, and is especially suitable for high-pressure fluid environments.

[0044] In embodiment 2, a sleeve 11 is welded to the outer wall of the other side of the gearbox 3, and a U-shaped frame 12 is fixedly connected to the outer wall of one end of the sleeve 11 via a flange. A first bevel gear 13 is installed on the top of the outer wall of the valve pipe 4, and a second bevel gear 14 meshes on the outer wall of the first bevel gear 13. A connecting rod 15 is welded to the inner wall of the second bevel gear 14, and a connecting seat 16 is fixedly connected to the outer wall of one end of the connecting rod 15. A hydraulic push rod 17 is hinged between the connecting seat 16 and the U-shaped frame 12. The connecting rod 15 is rotatably connected to the inner wall of the U-shaped frame 12, and the connecting seat 16 is located inside the U-shaped frame 12. The connecting rod 15 is disposed through the inside of the sleeve 11.

[0045] The connecting rod 15 and the second bevel gear 14 are fixed by welding to ensure that the transmission torque is lossless. The inner wall of the U-shaped frame 12 is provided with a self-lubricating copper sleeve to reduce the rotational friction of the connecting rod 15.

[0046] In this embodiment, the linkage between the first bevel gear 13 and the second bevel gear 14 in the bevel gear transmission structure and the hydraulic push rod 17 can precisely adjust the rotation angle of the sealing plate 5. Furthermore, the design of the dial 19 and the pointer 18 allows the operator to monitor the valve opening in real time. The limit block 20 limits the rotation range of the pointer 18 to 90° to prevent overload. The electronic controller 28 integrates the control of the hydraulic push rod 17, the pressure gauge 24, and the solenoid valve 26 to achieve automated operation and significantly improve system stability.

[0047] In embodiment three, the airflow conversion assembly 8 includes a lower air chamber 81, an upper air chamber 82, an annular pipe 83, a lower vent 84, an upper vent 85, an exhaust port 86, an exhaust chamber 87, and an exhaust head 88. The lower air chamber 81 is fixedly connected to the top outer wall of the valve pipe 4, the upper air chamber 82 is tightly attached to the top outer wall of the lower air chamber 81, the annular pipe 83 is fixedly connected to the outer wall of the upper air chamber 82, the lower vent 84 is opened on the top outer wall of the lower air chamber 81, and the upper vent 85 is... 5 is opened on the bottom outer wall of the upper air chamber 82, and the upper air vent 85 and the lower air vent 84 correspond one-to-one. The exhaust port 86 is opened on one side outer wall of the lower air chamber 81. The exhaust chamber 87 is set on one side outer wall of the annular pipe 83. The exhaust head 88 is welded to one side outer wall of the exhaust chamber 87. The upper air chamber 82 is fixedly connected to the bottom outer wall of the intake pipe 9. The lower air chamber 81 is slidably connected to the inner wall of the annular pipe 83. The exhaust head 88 and the exhaust port 86 are vertically distributed.

[0048] The lower air chamber 81 of the airflow conversion assembly 8 is welded and fixed to the top of the valve pipe 4, and the upper air chamber 82 is welded to the air inlet pipe 9. The contact surfaces of the two are coated with silicone grease to enhance airtightness. The inner wall of the annular pipe 83 is coated with polytetrafluoroethylene to ensure smooth sliding of the lower air chamber 81.

[0049] In this embodiment, when the sealing plate 5 is turned to the open state, that is, when the cross-sectional area of ​​the fluid channel is increased, the valve pipe 4 rotates with the drive of the hydraulic push rod 17, which drives the lower air chamber 81 and the upper air chamber 82 in the airflow conversion component 8 to move relative to each other, so that the lower vent 84 and the upper vent 85 are far apart. The gas in the annular compensation airbag 6 enters the exhaust chamber 87 through the exhaust port 86, and is finally quickly discharged through the vertically distributed exhaust head 88. After the annular compensation airbag 6 contracts, it avoids obstructing the fluid flow, and at the same time reduces the fatigue damage caused by long-term pressure on the annular compensation airbag 6, thus extending its service life.

[0050] A pointer 18 is welded to the outer wall of the end of the connecting rod 15 away from the second bevel gear 14, and a scale 19 is welded to the outer wall of one side of the U-shaped frame 12. The pointer 18 points to the scale line of the scale 19. Adjacent limit blocks 20 are welded to the outer wall of one side of the scale 19, and the pointer 18 is located between the two limit blocks 20. The included angle between the two limit blocks 20 is 90°.

[0051] With the above scheme, the distance between the pointer 18 and the scale line of the dial 19 is 1°, the limit block 20 is fixed to the side wall of the U-shaped frame 12 by laser welding, and the included angle between the two limit blocks 20 is 90°, corresponding to the full opening to full closing stroke of the valve.

[0052] The valve housing 1 includes a valve body 21 and a bushing 22. The bearing sealing sleeve 2 is welded to the top inner wall of the valve body 21, the bushing 22 is installed on the inner wall of the valve body 21, the annular compensation airbag 6 is tightly attached to the inner wall of the bushing 22, and the bottom outer wall of the sealing plate 5 is welded with a positioning post 23, which is rotatably connected to the bottom inner wall of the bushing 22.

[0053] With the above method, the positioning pin 23 is inserted into the precision bearing at the bottom of the bushing 22 to prevent the sealing plate 5 from shifting radially.

[0054] A pressure gauge 24 is installed on the outer wall of the top of the gas cylinder 10, and a gas supply pipe 25 is fixedly connected to the outer wall of the other end of the gas cylinder 10. A solenoid valve 26 is installed on the outer wall of the gas supply pipe 25.

[0055] According to the above scheme, the gas cylinder 10 is made of carbon fiber composite material, with a working pressure of 0.8-1.2MPa. The end of the gas supply pipe 25 is connected to an external gas source. The solenoid valve 26 is normally closed. When the pressure gauge 24 detects that the pressure of the gas cylinder 10 is lower than the set value, the electronic controller 28 automatically opens the solenoid valve 26 to supply gas.

[0056] A support plate 27 is welded to the outer wall of the other side of the gearbox 3, and the gas cylinder 10 is fixedly connected to the top outer wall of the support plate 27 by screws.

[0057] An electronic controller 28 is fixedly connected to one outer wall of the gearbox 3 by screws, and the electronic controller 28 is connected to the hydraulic push rod 17, the pressure gauge 24 and the solenoid valve 26 by signal lines.

[0058] Through the above scheme, the electronic controller 28 integrates the control of the hydraulic push rod 17, the air pressure gauge 24 and the solenoid valve 26 to achieve automated operation and improve system stability.

[0059] Working principle:

[0060] Off state:

[0061] Sealing compensation: After receiving the closing command, the electronic controller 28 drives the hydraulic push rod 17 to retract, and through the connecting rod 15 and the first bevel gear 13 and the second bevel gear 14, drives the valve pipe 4 to rotate 90°, so that the sealing plate 5 is perpendicular to the bushing 22.

[0062] Simultaneously, compressed gas in the gas cylinder 10 enters the upper air chamber 82 through the inlet pipe 9, flows into the lower air chamber 81 through the aligned lower vent 84 and upper vent 85, and is finally injected into the annular compensation airbag 6 through the blowing hole 7. After the annular compensation airbag 6 expands, it fills the sealing gap, achieving zero leakage.

[0063] On status:

[0064] Venting and flow: When the valve needs to be opened, the hydraulic push rod 17 extends and drives the sealing plate 5 to rotate parallel to the fluid direction.

[0065] The rotation of valve pipe 4 causes the lower air chamber 81 to slide, so that the lower vent 84 and the upper vent 85 are far apart. The gas in the annular compensation airbag 6 enters the exhaust chamber 87 through the exhaust port 86, and is finally discharged quickly through the vertically distributed exhaust head 88. After the annular compensation airbag 6 contracts, it avoids obstructing the flow of fluid.

[0066] The included angle between the two limit blocks 20 is 90°, the distance between the pointer 18 and the scale line of the dial 19 is 1°, the pointer 18 on the dial 19 displays the valve opening in real time, and the limit blocks 20 ensure that the rotation angle does not exceed 90° to prevent mechanical overload.

[0067] Intelligent monitoring and maintenance: The electronic controller 28 monitors the pressure of the gas cylinder 10 in real time through the pressure gauge 24. When the pressure is lower than 0.6MPa, the solenoid valve 26 is automatically activated to replenish the gas.

[0068] The inflation and deflation cycle of the annular compensating airbag 6 can be adjusted by programming the electronic controller 28 to adapt to different working conditions.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulically self-closing butterfly valve, comprising a valve body (1), characterized in that, The valve housing (1) is welded with a bearing sealing sleeve (2) on the top outer wall, and the bearing sealing sleeve (2) is fixedly connected to a gearbox (3) via a flange. The gearbox (3) is rotatably connected to a valve pipe (4) on the bottom inner wall, and the valve pipe (4) is rotatably connected to the inner wall of the bearing sealing sleeve (2) via a bearing. The valve pipe (4) is welded with a sealing plate (5) on the bottom outer wall, and an annular compensation airbag (6) is bonded to the outer wall of the sealing plate (5). An air blowing hole (7) is opened at the bottom of the outer wall of the valve pipe (4). A gas storage bottle (10) is provided on the top of one side outer wall of the gearbox (3), and an air inlet pipe (9) is fixedly connected to one end of the outer wall of the gas storage bottle (10). An airflow conversion assembly (8) is provided between the air inlet pipe (9) and the valve pipe (4). A sleeve (11) is welded to the outer wall of the other side of the gearbox (3), and a U-shaped frame (12) is fixedly connected to one end of the outer wall of the sleeve (11) through a flange. A first bevel gear (13) is installed on the top of the outer wall of the valve pipe (4), and a second bevel gear (14) meshes on the outer wall of the first bevel gear (13). A connecting rod (15) is welded to the inner wall of the second bevel gear (14), and a connecting seat (16) is fixedly connected to one end of the outer wall of the connecting rod (15). A hydraulic push rod (17) is hinged between the connecting seat (16) and the U-shaped frame (12).

2. The hydraulically self-closing butterfly valve according to claim 1, characterized in that, The airflow conversion assembly (8) includes a lower air chamber (81), an upper air chamber (82), an annular pipe (83), a lower vent (84), an upper vent (85), an exhaust port (86), an exhaust chamber (87), and an exhaust head (88). The lower air chamber (81) is fixedly connected to the top outer wall of the valve pipe (4), the upper air chamber (82) is tightly attached to the top outer wall of the lower air chamber (81), and the annular pipe (83) is fixedly connected to the outer wall of the upper air chamber (82). On the wall, the lower vent (84) is opened on the top outer wall of the lower air chamber (81), the upper vent (85) is opened on the bottom outer wall of the upper air chamber (82), and the upper vent (85) and the lower vent (84) correspond one to one. The exhaust hole (86) is opened on one side outer wall of the lower air chamber (81), the exhaust chamber (87) is set on one side outer wall of the annular pipe (83), and the exhaust head (88) is welded to one side outer wall of the exhaust chamber (87).

3. A hydraulically self-closing butterfly valve according to claim 2, characterized in that, The upper air chamber (82) is fixedly connected to the bottom outer wall of the air inlet pipe (9), the lower air chamber (81) is slidably connected to the inner wall of the annular pipe (83), and the exhaust head (88) and the exhaust hole (86) are vertically distributed.

4. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, The connecting rod (15) is rotatably connected to the inner wall of the U-shaped frame (12), and the connecting seat (16) is located inside the U-shaped frame (12). The connecting rod (15) is inserted through the inside of the sleeve (11).

5. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, A pointer (18) is welded to the outer wall of the end of the connecting rod (15) away from the second bevel gear (14), and a dial (19) is welded to the outer wall of one side of the U-shaped frame (12). The pointer (18) points to the scale line of the dial (19). Adjacent limit blocks (20) are welded to the outer wall of one side of the dial (19), and the pointer (18) is located between the two limit blocks (20). The included angle between the two limit blocks (20) is 90°.

6. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, The valve housing (1) includes a valve body (21) and a bushing (22), wherein the bearing sealing sleeve (2) is welded to the top inner wall of the valve body (21), the bushing (22) is installed on the inner wall of the valve body (21), and the annular compensation airbag (6) is tightly attached to the inner wall of the bushing (22).

7. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, The sealing plate (5) has a positioning post (23) welded to the bottom outer wall, and the positioning post (23) is rotatably connected to the bottom inner wall of the bushing (22).

8. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, A pressure gauge (24) is installed on the top outer wall of the gas cylinder (10), and a gas supply pipe (25) is fixedly connected to the outer wall of the other end of the gas cylinder (10). A solenoid valve (26) is installed on the outer wall of the gas supply pipe (25).

9. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, A support plate (27) is welded to the outer wall of the other side of the gearbox (3), and the gas cylinder (10) is fixedly connected to the top outer wall of the support plate (27) by screws.

10. A hydraulically self-closing butterfly valve according to claim 1, characterized in that, The gearbox (3) has an electric controller (28) fixedly connected to one side of its outer wall by screws, and the electric controller (28) is connected to the hydraulic push rod (17), the pressure gauge (24) and the solenoid valve (26) by signal lines.

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