Duplex butterfly valve

Abstract

The invention belongs to the technical field of butterfly valves, particularly relates to a duplex butterfly valve, and aims to solve the problems of single function, insufficient sealing performance, low switching efficiency and lack of integrated monitoring in the background technology, the following scheme is provided: the duplex butterfly valve comprises a duplex pipe, and the outer walls of the two ends of the duplex pipe are fixedly connected with butterfly valve pieces through flanges; and a gear driving box is arranged at the position, located between the two butterfly valve pieces, of the inner side of the duplex pipe, a double-valve parallel mechanism is arranged on the inner wall of the gear driving box, the two ends of the double-valve parallel mechanism are arranged in the two butterfly valve pieces, and a parallel switching mechanism is arranged on the outer wall of the gear driving box. Through combination of the duplex pipe and the double butterfly valve piece, independent or synchronous control of two channels is achieved, the system structure is simplified, the installation space is saved, the cost is reduced, the double-channel parallel control characteristic is achieved, double-valve parallel control, rapid switching, high sealing performance and intelligent monitoring are achieved, and the double-channel parallel control valve is suitable for petrochemical engineering, water supply and drainage systems and other complex industrial scenes.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valves, and in particular to a double butterfly valve. Background Art

[0002] A butterfly valve is a valve widely used in fluid control systems. Its core structure includes a valve body, a valve stem, a butterfly plate and a sealing assembly. The butterfly plate is usually disc-shaped and can open or close or regulate the fluid by rotating around an axis. When the butterfly plate is parallel to the axis of the pipeline, the valve is fully open and the fluid resistance is minimal; when the butterfly plate rotates to be perpendicular to the axis, the valve closes and blocks the fluid. Butterfly valves have the advantages of compact structure, fast opening and closing, light weight and low cost, and are widely used in chemical, petroleum, water treatment and other fields. Traditional butterfly valves can be divided into manual, pneumatic, electric and other types according to the drive mode, but their functions are single and they can usually only control a single flow channel, which makes it difficult to meet the multi-channel switching requirements under complex working conditions.

[0003] Although butterfly valves are widely used, they still have significant disadvantages: 1. Single function: Traditional butterfly valves are mostly single-valve designs, which cannot achieve dual-channel independent control or parallel switching. Multiple valves must be used in combination, resulting in a complex system, large space occupation, and increased costs.

[0004] 2. Insufficient sealing performance: The butterfly plate seal of existing butterfly valves mostly relies on the tight contact between the rubber ring and the valve body. After long-term use, it is easy to cause leakage due to wear or aging, especially under high pressure or high temperature conditions, the risk of failure is higher.

[0005] 3. Low switching efficiency: Manual or electric-driven single valve switching requires multiple operations and has a slow response speed, which makes it difficult to meet industrial scenarios that require fast switching (such as emergency interception and multi-process switching).

[0006] 4. Lack of integrated monitoring: Most butterfly valves do not have integrated flow monitoring modules and require additional sensors to be installed, resulting in low system integration and complex maintenance.

[0007] The above defects limit the application of butterfly valves in complex industrial scenarios. There is an urgent need for a multifunctional butterfly valve with high integration, reliable sealing and support for fast switching. Summary of the invention

[0008] In view of the deficiencies of the prior art, the present invention provides a double butterfly valve, which overcomes the deficiencies of the prior art and effectively solves the problems of single function, insufficient sealing performance, low switching efficiency and lack of integrated monitoring.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: A double butterfly valve, comprising a double pipe, the outer walls of both ends of the double pipe are fixedly connected with butterfly valve parts through flanges, and a gear drive box is arranged on the inner side of the double pipe between the two butterfly valve parts, a double valve parallel mechanism is arranged on the inner wall of the gear drive box, and both ends of the double valve parallel mechanism are arranged inside the two butterfly valve parts, and a parallel switching mechanism is arranged on the outer wall of the gear drive box; Through the above scheme, through the combination of double pipes and double butterfly valves, independent or synchronous control of the two flow channels can be achieved, the system structure is simplified, installation space is saved, and costs are reduced. It has the characteristics of dual-channel parallel control, and the butterfly seal adopts a dual design of rubber compensation ring and reinforcement rod to compensate for wear clearance and enhance seal durability. It is especially suitable for high pressure, high temperature and corrosive media environments, and has the characteristics of high reliability sealing.

[0010] The double-valve parallel mechanism includes a servo motor, a first connecting rod, a first bevel gear, a second bevel gear, a short-circuit rod, a second connecting rod, a butterfly seal, a first gear, a second gear, and a manual handle, wherein the servo motor is fixedly connected to an outer wall of one side of the gear drive box by screws, the first connecting rod is fixedly connected to the output shaft of the servo motor by a coupling, the first bevel gear is installed on the outer wall of the first connecting rod, the second bevel gear is meshed with the outer wall of the first bevel gear, the short-circuit rod is installed on the inner wall of the second bevel gear, the second connecting rod is arranged at one end of the short-circuit rod, the butterfly seal includes two and is respectively arranged on the outer walls of one end of the first connecting rod and the second connecting rod, the first gear is installed on the outer wall of the first connecting rod, the second gear is meshed with the outer wall of the first gear, and the manual handle is installed on the inner wall of the second gear.

[0011] Through the above solution, the gear drive box integrates servo motor and manual handle dual-mode drive, combined with the pneumatic control of the parallel switching mechanism, can achieve millisecond-level channel switching, greatly improve operating efficiency, and has the advantages of intelligent switching and driving. The built-in flow meter monitors the flow data of each flow channel in real time, and intuitive feedback is provided through the display, which is convenient for precise regulation and fault diagnosis, and has the advantage of integrated flow monitoring.

[0012] Preferably, the butterfly valve component includes a valve body, a bushing and a bearing sleeve, wherein the valve body is fixedly connected to the outer wall of the double pipe through a flange, the bushing is arranged on the inner wall of the valve body, the bearing sleeve is welded to the outer wall of one side of the valve body, and the first connecting rod and the second connecting rod are both rotatably connected to the inner wall of the bearing sleeve through a sealed bearing.

[0013] Preferably, the butterfly seal includes a sealing plate, a rubber compensation ring and a reinforcement rod, wherein the sealing plate is welded to the outer walls of the first combining rod and the second combining rod, the rubber compensation ring is bonded to the annular outer wall of the sealing plate, the reinforcement rod is welded to the outer walls on both sides of the sealing plate, and the rubber compensation ring is tightly attached to the inner wall of the bushing.

[0014] Preferably, the parallel switching mechanism includes a cylinder, a connecting head, a traction ring and a switching sleeve, wherein the cylinder is fixedly connected to the top outer wall of the gear drive box by screws, the connecting head is fixedly connected to the piston rod of the cylinder, the traction ring is welded to the outer wall of one end of the connecting head, and the switching sleeve is rotatably connected to the inner wall of the traction ring.

[0015] Preferably, an outer wall on one side of one of the valve bodies is fixedly connected to an air inlet pipe via a flange, and an outer wall on one side of the double pipe is fixedly connected to a first exhaust pipe via a flange, and an outer wall on one side of the other valve body is fixedly connected to a second exhaust pipe via a flange, and flow meters are provided on the inner walls of the double pipe, the air inlet pipe, the first exhaust pipe and the second exhaust pipe.

[0016] Preferably, the flow meter includes a flow display, a long rod and a flow sensor, wherein the long rod is installed on the inner walls of the double pipe, the intake pipe, the first exhaust pipe and the second exhaust pipe, the flow display is arranged on the top outer wall of the long rod, and the flow sensor is arranged on the bottom outer wall of the long rod.

[0017] Preferably, a first hand wheel and a second hand wheel are fixedly connected to the outer walls of the first combined rod and the second combined rod, respectively.

[0018] Preferably, the outer walls of the short-circuit rod and the second combined rod are both provided with equally spaced limiting strips, and the inner wall of the switching sleeve is provided with equally spaced guiding grooves, which are slidably connected to the outer walls of the limiting strips.

[0019] Through the above scheme, using the limit and guide design, the cooperation of the limit bar and the guide groove ensures the precise movement of the switching sleeve, avoids jamming or offset, and improves the stability of the system. In summary, dual-valve parallel control, fast switching, high sealing and intelligent monitoring are achieved, which is suitable for complex industrial scenarios such as petrochemical, water supply and drainage systems, etc.

[0020] Preferably, symmetrically distributed connecting rods are welded between the bushing and the gear drive box.

[0021] Preferably, the first combined rod, the short-circuit rod and the manual handle are all rotatably connected to the inner wall of the gear drive box.

[0022] The beneficial effects of the present invention are: 1. The double butterfly valve of the present invention realizes independent or synchronous control of two flow channels through the combination of double pipes and double butterfly valve parts, simplifies the system structure, saves installation space, reduces costs, has the characteristics of dual-channel parallel control, and the butterfly seal adopts a double design of rubber compensation ring and reinforcement rod to compensate for wear gap and enhance seal durability. It is particularly suitable for high-pressure, high-temperature and corrosive media environments and has the characteristics of high-reliability sealing; 2. The double butterfly valve of the present invention has a gear drive box that integrates a servo motor and a manual handle dual-mode drive. Combined with the pneumatic control of the parallel switching mechanism, it can achieve millisecond-level channel switching, greatly improving the operating efficiency. It has the advantages of intelligent switching and driving, and the built-in flow meter monitors the flow data of each flow channel in real time. The intuitive feedback is provided by the display, which is convenient for precise control and fault diagnosis, and has the advantage of integrated flow monitoring; 3. The double butterfly valve of the present invention utilizes a limit and guide design. The cooperation between the limit bar and the guide groove ensures the precise movement of the switching sleeve, avoids jamming or deviation, and improves the stability of the system. In summary, it realizes double valve parallel control, fast switching, high sealing and intelligent monitoring, and is suitable for complex industrial scenarios such as petrochemicals, water supply and drainage systems, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The overall structure of a double butterfly valve proposed by the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of a double butterfly valve proposed by the present invention is shown in FIG. Figure 2 ; Figure 3 A top view of the overall structure of a double butterfly valve proposed by the present invention; Figure 4 It is a schematic diagram of the partial structure enlargement of a double butterfly valve proposed by the present invention; Figure 5 A schematic diagram of the structure of a butterfly valve component of a double butterfly valve proposed by the present invention; Figure 6 A schematic diagram of a double valve parallel mechanism of a double butterfly valve proposed in the present invention Figure 1 ; Figure 7 A schematic diagram of a double valve parallel mechanism of a double butterfly valve proposed in the present invention Figure 2 ; Figure 8 A schematic diagram of a parallel switching mechanism of a double butterfly valve proposed by the present invention; Fig. 9 A schematic diagram of the connection structure of a short-circuit rod and a second combined rod of a double butterfly valve proposed by the present invention; Fig.10 A schematic diagram of a butterfly-type sealing structure of a double butterfly valve proposed by the present invention; Fig.11 This is a schematic diagram of the flow meter connection structure of a double butterfly valve proposed in the present invention.

[0024] In the figure: 1. double pipe; 2. butterfly valve member; 21. valve body; 22. bushing; 23. bearing sleeve; 3. gear drive box; 4. double valve parallel mechanism; 41. servo motor; 42. first joint rod; 43. first bevel gear; 44. second bevel gear; 45. short-circuit rod; 46. second joint rod; 47. butterfly seal; 471. sealing plate; 472. rubber compensation ring; 473. reinforcement rod; 48. first gear; 49. second gear; 410. manual handle; 5. parallel switching mechanism; 51. cylinder; 52. connector; 53. traction ring; 54. switching sleeve; 6. intake pipe; 7. first exhaust pipe; 8. second exhaust pipe; 9. flow meter; 91. flow display; 92. long rod; 93. flow sensor; 10. first hand wheel; 11. second hand wheel; 12. limit strip; 13. connecting rod. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Embodiment 1, refer to Figure 1-Figure 4 A double butterfly valve comprises a double tube 1, the outer walls at both ends of the double tube 1 are fixedly connected with butterfly valve parts 2 through flanges, and a gear drive box 3 is arranged on the inner side of the double tube 1 between the two butterfly valve parts 2, a double valve parallel mechanism 4 is arranged on the inner wall of the gear drive box 3, and both ends of the double valve parallel mechanism 4 are arranged inside the two butterfly valve parts 2, and a parallel switching mechanism 5 is arranged on the outer wall of the gear drive box 3.

[0027] In this embodiment, through the combination of the double-pipe 1 and the double butterfly valve 2, independent or synchronous control of the two flow channels is achieved, the system structure is simplified, the installation space is saved, the cost is reduced, and it has the characteristics of dual-channel parallel control. In addition, the butterfly seal 47 adopts a double design of a rubber compensation ring 472 and a reinforcement rod 473 to compensate for the wear gap and enhance the durability of the seal. It is particularly suitable for high-pressure, high-temperature and corrosive medium environments and has the characteristics of high-reliability sealing.

[0028] Example 2, refer to Figure 6-Figure 7A double butterfly valve, the double valve parallel mechanism 4 includes a servo motor 41, a first joint rod 42, a first bevel gear 43, a second bevel gear 44, a short-circuit rod 45, a second joint rod 46, a butterfly seal 47, a first gear 48, a second gear 49, and a manual handle 410, wherein the servo motor 41 is fixedly connected to the outer wall of one side of the gear drive box 3 by screws, the first joint rod 42 is fixedly connected to the output shaft of the servo motor 41 by a coupling, and the first bevel gear 43 is installed on the first joint rod 42, the second bevel gear 44 is meshed with the outer wall of the first bevel gear 43, the short-circuit rod 45 is installed on the inner wall of the second bevel gear 44, the second combining rod 46 is arranged at one end of the short-circuit rod 45, the butterfly seal 47 includes two and is respectively arranged on the outer wall of one end of the first combining rod 42 and the second combining rod 46, the first gear 48 is installed on the outer wall of the first combining rod 42, the second gear 49 is meshed with the outer wall of the first gear 48, and the manual handle 410 is installed on the inner wall of the second gear 49.

[0029] In this embodiment, the gear drive box 3 integrates a servo motor 41 and a manual handle 410 dual-mode drive, and combined with the pneumatic control of the parallel switching mechanism 5, it can achieve millisecond-level channel switching, greatly improving operating efficiency, and has the advantages of intelligent switching and driving. The built-in flow meter 9 monitors the flow data of each flow channel in real time, and intuitive feedback is provided through the display, which is convenient for precise regulation and fault diagnosis, and has the advantage of integrated flow monitoring.

[0030] The gear drive box 3 is located in the middle of the double pipe 1, and a double valve parallel mechanism 4 is installed inside: The servo motor 41 drives the first joint rod 42 to rotate through the coupling, and the first bevel gear 43 meshes with the second bevel gear 44 to transmit power to the short-circuit rod 45 and the second joint rod 46 to achieve synchronous action of the two butterfly seals 47.

[0031] Manual handle 410: meshes with the first gear 48 through the second gear 49 to support manual operation in power failure or emergency situations.

[0032] Example 3, refer to Figure 8-Figure 9 A double butterfly valve, the parallel switching mechanism 5 includes a cylinder 51, a connecting head 52, a traction ring 53 and a switching sleeve 54, wherein the cylinder 51 is fixedly connected to the top outer wall of the gear drive box 3 by screws, the connecting head 52 is fixedly connected to the piston rod of the cylinder 51, the traction ring 53 is welded to the outer wall of one end of the connecting head 52, and the switching sleeve 54 is rotatably connected to the inner wall of the traction ring 53.

[0033] In this embodiment, the limit and guide design is utilized, and the cooperation between the limit bar 12 and the guide groove ensures the precise movement of the switching sleeve 54, avoids jamming or deviation, and improves the stability of the system. In summary, dual-valve parallel control, fast switching, high sealing and intelligent monitoring are achieved, which is suitable for complex industrial scenarios such as petrochemicals, water supply and drainage systems, etc.

[0034] The parallel switching mechanism 5 drives the switching sleeve 54 via the cylinder 51: Cylinder 51: The piston rod drives the connector 52 and the traction ring 53 to move linearly.

[0035] Switching sleeve 54 : The inner wall guide groove and the limit strip 12 are slidably matched to control the linkage relationship between the short-circuit rod 45 and the second joint rod 46 to achieve flow channel switching, such as switching from the first exhaust pipe 7 to the second exhaust pipe 8 .

[0036] Reference Figure 5 The butterfly valve component 2 includes a valve body 21, a bushing 22 and a bearing sleeve 23, wherein the valve body 21 is fixedly connected to the outer wall of the double pipe 1 through a flange, the bushing 22 is arranged on the inner wall of the valve body 21, the bearing sleeve 23 is welded to the outer wall of one side of the valve body 21, and the first combined rod 42 and the second combined rod 46 are both rotatably connected to the inner wall of the bearing sleeve 23 through a sealed bearing.

[0037] The double pipe 1 is a horizontally arranged tubular structure, with the butterfly valve 2 fixed at both ends by flanges. The butterfly valve 2 includes a valve body 21, a bushing 22 and a bearing sleeve 23: Valve body 21: Made of stainless steel casting, the internal bushing 22 is a wear-resistant ceramic layer to reduce fluid erosion and wear.

[0038] Bearing sleeve 23: welded to the side wall of the valve body 21, with a built-in sealed bearing to support the rotational movement of the first combined rod 42 and the second combined rod 46 to ensure a tight shaft seal.

[0039] Reference Fig.10 The butterfly seal 47 includes a sealing plate 471, a rubber compensation ring 472 and a reinforcement rod 473, wherein the sealing plate 471 is welded to the outer walls of the first combined rod 42 and the second combined rod 46, the rubber compensation ring 472 is bonded to the annular outer wall of the sealing plate 471, the reinforcement rod 473 is welded to the outer walls on both sides of the sealing plate 471, and the rubber compensation ring 472 is tightly attached to the inner wall of the bushing 22.

[0040] The butterfly seal 47 is composed of a sealing plate 471, a rubber compensation ring 472 and a reinforcement rod 473: Sealing plate 471: welded to the end of the joint rod, and controls the opening and closing of the flow channel as the rod rotates.

[0041] Rubber compensation ring 472: annular design, bonded to the outer edge of the sealing plate 471, close to the inner wall of the bushing 22 when under pressure, dynamically compensating for the wear gap.

[0042] Reinforcement rods 473: symmetrically welded to both sides of the sealing plate 471 to enhance structural rigidity and prevent deformation.

[0043] Reference Figure 3 An outer wall on one side of the valve body 21 is fixedly connected to an air intake pipe 6 via a flange, and an outer wall on one side of the double pipe 1 is fixedly connected to a first exhaust pipe 7 via a flange, and an outer wall on one side of the other valve body 21 is fixedly connected to a second exhaust pipe 8 via a flange, and flow meters 9 are provided on the inner walls of the double pipe 1, the air intake pipe 6, the first exhaust pipe 7 and the second exhaust pipe 8.

[0044] Reference Fig.11 The flow meter 9 includes a flow display 91, a long rod 92 and a flow sensor 93, wherein the long rod 92 is installed on the inner walls of the double pipe 1, the intake pipe 6, the first exhaust pipe 7 and the second exhaust pipe 8, the flow display 91 is arranged on the top outer wall of the long rod 92, and the flow sensor 93 is arranged on the bottom outer wall of the long rod 92.

[0045] The flow meter 9 is installed on the inner wall of each flow channel, and includes a long rod 92, a flow sensor 93 and a flow display 91: Flow sensor 93: uses ultrasonic or turbine sensing technology to collect flow data in real time.

[0046] Flow display 91: embedded installation, displays instantaneous flow and cumulative value, supports data export.

[0047] Reference Figure 6 The first hand wheel 10 and the second hand wheel 11 are fixedly connected to the outer walls of the first combined rod 42 and the second combined rod 46 respectively.

[0048] Reference Fig. 9 The outer walls of the short-circuit rod 45 and the second combined rod 46 are both provided with equally spaced limiting strips 12 , and the inner wall of the switching sleeve 54 is provided with equally spaced guiding grooves, which are slidably connected to the outer wall of the limiting strip 12 .

[0049] Reference Figure 4 A symmetrically distributed connecting rod 13 is welded between the bushing 22 and the gear drive box 3 .

[0050] The limiting strips 12 are evenly distributed on the surfaces of the short-circuit rod 45 and the second combined rod 46 , and cooperate with the guide grooves of the switching sleeve 54 to ensure the accuracy of the movement trajectory.

[0051] Connecting rod 13: welded between bushing 22 and gear drive box 3 to enhance overall structural stability.

[0052] Reference Figure 4 The first combined rod 42 , the short-circuit rod 45 and the manual handle 410 are all rotatably connected to the inner wall of the gear drive box 3 .

[0053] Working principle: 1. Opening and closing control: Electric mode: The servo motor 41 is started to drive the first joint rod 42 to rotate, and the second joint rod 46 is driven to rotate synchronously through the bevel gear set, so that the two butterfly seals 47 rotate to a preset angle, thereby realizing the synchronous opening or closing of the dual flow channels.

[0054] Manual mode: Turn the manual handle 410 to transmit torque through the gear set, and the operation process is equivalent to the electric mode.

[0055] 2. Flow channel switching: The cylinder 51 pushes the switching sleeve 54 to slide along the limit bar 12, changing the linkage state between the short-circuit rod 45 and the second joint rod 46. For example, when the switching sleeve 54 moves to the left, the short-circuit rod 45 is separated from the second joint rod 46, and only the first flow channel intake pipe 6 to the first exhaust pipe 7 is connected; when it is switched to the right, the second flow channel intake pipe 6 to the second exhaust pipe 8 is activated.

[0056] 3. Sealing and compensation: The rubber compensation ring 472 of the butterfly seal 47 is tightly attached to the bushing 22 under fluid pressure, and can maintain sealing even after long-term wear; the reinforcement rod 473 prevents the sealing plate 471 from being deformed due to high pressure.

[0057] 4. Traffic monitoring and feedback: The flow sensor 93 detects the flow of each flow channel in real time, and the data is transmitted to the flow display 91 through the long rod 92. The operator can adjust the valve according to the displayed value.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double butterfly valve, comprising a double pipe (1), characterized in that: The outer walls of both ends of the double pipe (1) are fixedly connected to butterfly valve components (2) via flanges, and a gear drive box (3) is arranged on the inner side of the double pipe (1) between the two butterfly valve components (2), a double valve parallel mechanism (4) is arranged on the inner wall of the gear drive box (3), and both ends of the double valve parallel mechanism (4) are arranged inside the two butterfly valve components (2), and a parallel switching mechanism (5) is arranged on the outer wall of the gear drive box (3); The dual-valve parallel mechanism (4) comprises a servo motor (41), a first joint rod (42), a first bevel gear (43), a second bevel gear (44), a short-circuit rod (45), a second joint rod (46), a butterfly seal (47), a first gear (48), a second gear (49), and a manual handle (410), wherein the servo motor (41) is fixedly connected to an outer wall of one side of the gear drive box (3) by means of screws, the first joint rod (42) is fixedly connected to an output shaft of the servo motor (41) by means of a coupling, and the first bevel gear (43) is mounted on the first joint rod (42). The second bevel gear (44) is meshed with the outer wall of the first bevel gear (43), the short-circuit rod (45) is mounted on the inner wall of the second bevel gear (44), the second connecting rod (46) is arranged at one end of the short-circuit rod (45), the butterfly seal (47) includes two and is respectively arranged on the outer wall of one end of the first connecting rod (42) and the second connecting rod (46), the first gear (48) is mounted on the outer wall of the first connecting rod (42), the second gear (49) is meshed with the outer wall of the first gear (48), and the manual handle (410) is mounted on the inner wall of the second gear (49).

2. A double butterfly valve according to claim 1, characterized in that: The butterfly valve component (2) comprises a valve body (21), a bushing (22) and a bearing sleeve (23), wherein the valve body (21) is fixedly connected to the outer wall of the double pipe (1) via a flange, the bushing (22) is arranged on the inner wall of the valve body (21), the bearing sleeve (23) is welded to the outer wall of one side of the valve body (21), and the first combined rod (42) and the second combined rod (46) are both rotatably connected to the inner wall of the bearing sleeve (23) via a sealed bearing.

3. A double butterfly valve according to claim 1, characterized in that: The butterfly seal (47) comprises a sealing plate (471), a rubber compensation ring (472) and a reinforcement rod (473), wherein the sealing plate (471) is welded to the outer walls of the first joint rod (42) and the second joint rod (46), the rubber compensation ring (472) is bonded to the annular outer wall of the sealing plate (471), the reinforcement rod (473) is welded to the outer walls on both sides of the sealing plate (471), and the rubber compensation ring (472) is tightly attached to the inner wall of the bushing (22).

4. A double butterfly valve according to claim 1, characterized in that: The parallel switching mechanism (5) comprises a cylinder (51), a connecting head (52), a traction ring (53) and a switching sleeve (54), wherein the cylinder (51) is fixedly connected to the top outer wall of the gear drive box (3) by means of screws, the connecting head (52) is fixedly connected to the piston rod of the cylinder (51), the traction ring (53) is welded to the outer wall of one end of the connecting head (52), and the switching sleeve (54) is rotatably connected to the inner wall of the traction ring (53).

5. A double butterfly valve according to claim 2, characterized in that: An outer wall on one side of one of the valve bodies (21) is fixedly connected to an air inlet pipe (6) via a flange, and an outer wall on one side of the double pipe (1) is fixedly connected to a first exhaust pipe (7) via a flange, and an outer wall on one side of the other valve body (21) is fixedly connected to a second exhaust pipe (8) via a flange, and flow meters (9) are provided on the inner walls of the double pipe (1), the air inlet pipe (6), the first exhaust pipe (7) and the second exhaust pipe (8).

6. A double butterfly valve according to claim 5, characterized in that: The flow meter (9) comprises a flow display (91), a long rod (92) and a flow sensor (93), wherein the long rod (92) is mounted on the inner walls of the double pipe (1), the intake pipe (6), the first exhaust pipe (7) and the second exhaust pipe (8), the flow display (91) is arranged on the top outer wall of the long rod (92), and the flow sensor (93) is arranged on the bottom outer wall of the long rod (92).

7. A double butterfly valve according to claim 1, characterized in that: A first hand wheel (10) and a second hand wheel (11) are fixedly connected to the outer walls of the first combined rod (42) and the second combined rod (46), respectively.

8. A double butterfly valve according to claim 1, characterized in that: The outer walls of the short-circuit rod (45) and the second combined rod (46) are both provided with equally spaced limiting strips (12), and the inner wall of the switching sleeve (54) is provided with equally spaced guiding grooves, which are slidably connected to the outer walls of the limiting strips (12).

9. A double butterfly valve according to claim 2, characterized in that: Symmetrically distributed connecting rods (13) are welded between the bushing (22) and the gear drive box (3).

10. A double butterfly valve according to claim 1, characterized in that: The first combined rod (42), the short-circuit rod (45) and the manual handle (410) are all rotatably connected to the inner wall of the gear drive box (3).

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