Self-purging structure for preventing butterfly valve from being blocked and butterfly valve comprising same

Abstract

The invention relates to the technical field of butterfly valve cleaning, in particular to a self-purging structure for preventing a butterfly valve from being blocked and a butterfly valve comprising the structure.The self-purging structure for preventing the butterfly valve from being blocked comprises a cleaning assembly, and the cleaning assembly is used for cleaning impurities at the edge position of a butterfly piece of the butterfly valve; the cleaning assembly comprises two shovel plates, a hollow rotating shaft, two rotating pipes and two lifting rods, and the rotating pipes are fixedly connected to the two sides of the hollow rotating shaft; the invention further discloses the butterfly valve which comprises the self-purging structure for preventing the butterfly valve from being blocked and further comprises a valve body, a valve rod and a butterfly piece, and the butterfly piece is rotationally arranged in the valve body. The cleaning assembly and the rotating assembly are arranged on the two sides of the butterfly piece, the cleaning assembly can be driven by the rotating assembly to rotate around the butterfly piece, viscous impurities on the peripheral edge of the butterfly piece can be powerfully shoveled through a shoveling plate in the cleaning assembly, and the situation that the butterfly piece is difficult to rotate due to impurity accumulation is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of butterfly valve cleaning, and in particular to a self-purge structure for preventing a butterfly valve from being blocked and a butterfly valve comprising the structure. Background Art

[0002] The butterfly valve is a kind of pipeline equipment that controls the flow state of the fluid in the valve body through the internal butterfly. Its working principle is simple and direct, its size is small and its structure is simple, so it can be widely used in various working environments.

[0003] At present, butterfly valves are generally composed of a butterfly and a valve body. The disc is rotatably arranged inside the valve body, and the on-off of the fluid in the valve body is controlled by the rotation of the disc. This requires the butterfly to maintain a close fit with the inner wall of the valve body and have good sealing performance. This structure will inevitably lead to the easy deposition of impurities at the contact position between the butterfly and the inner wall of the valve body (i.e., the circumferential edge of the butterfly) (the material needs to pass through the inner wall of the valve body and contact the butterfly), especially when facing some highly viscous impurities (such as syrups in the food industry, polyethylene, polypropylene and other polymers in the chemical industry), it is difficult to completely clean up the impurities, which will cause the impurities to remain and gradually accumulate. The accumulated impurities will gradually increase the resistance to the rotation of the butterfly, and may even cause the butterfly to be unable to rotate normally. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and to propose a self-purge structure for preventing a butterfly valve from being blocked and a butterfly valve including the structure.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A self-purge structure for preventing a butterfly valve from being blocked, comprising: A cleaning assembly, the cleaning assembly is used to clean impurities at the edge of the butterfly of the butterfly valve, the cleaning assembly includes two shovel plates, a hollow rotating shaft, two rotating tubes and two lifting rods, the rotating tubes are fixedly connected to both sides of the hollow rotating shaft, and the rotating tubes are communicated with the inside of the hollow rotating shaft, the lower ends of the lifting rods are fixedly connected to the shovel plates, the lifting rods are arranged inside the rotating tubes, and the lower ends of the lifting rods are sealed and slidably penetrate the side walls of the rotating tubes; Preferably, a press plug is sealingly and slidably connected inside the hollow shaft, a spring is fixedly connected to the upper end of the press plug, the upper end of the spring is fixedly connected to the top of the hollow shaft, and the end of the lifting rod away from the shovel plate is fixedly connected to the lower end of the press plug; A rotating assembly, the rotating assembly is used to drive the cleaning assembly to rotate around the center of the butterfly of the butterfly valve, the rotating assembly includes two air jets, and the two air jets are fixedly connected to the side walls of the two rotating tubes, and the air jets are communicated with the interior of the rotating tubes to which they are fixedly connected, and the two air jets are symmetrically arranged along the axis of the hollow rotating shaft; A blowing assembly is used to spray and clean the edge of the shovel plate and the butterfly valve. The blowing assembly includes a swing tube and a swing mechanism. A first air cavity is opened in the hollow rotating shaft. The swing tube is connected to the first air cavity through an air guide mechanism. The swing mechanism is used to drive the swing tube to swing back and forth.

[0006] Preferably, the swing mechanism includes a gear, a fixed ring and a plurality of support rods, the gear is fixedly connected to the swing tube, the support rod is fixedly connected to the inner wall of the fixed ring, a plurality of arc-shaped tooth plates are fixedly connected to the circumferential side wall of the fixed ring, and the gear and the arc-shaped tooth plates cooperate with each other, a rotating joint is fixedly connected to the upper end of the swing tube, the rotating joint is connected to the side wall of the rotating tube through a torsion spring, and the swing tube is connected to the rotating joint.

[0007] Preferably, the air guide mechanism comprises an air guide pipe, the air guide pipe is rotatably connected to the rotary joint, the air guide pipe is communicated with the rotary joint, the air guide pipe is communicated with the first air cavity, and the first air cavity is also communicated with the first air inlet pipe.

[0008] Preferably, a second air cavity is opened at the lower end of the hollow rotating shaft, a second air inlet pipe is fixedly connected to the side wall of the hollow rotating shaft, one end of the second air inlet pipe is communicated with the second air cavity, and the other end of the second air inlet pipe is communicated with the interior of the hollow rotating shaft.

[0009] A butterfly valve includes the self-purge structure for preventing the butterfly valve from being blocked as described above, and also includes a valve body, a valve stem and a butterfly, wherein the butterfly is rotatably arranged in the valve body, the valve stem is fixedly connected to the butterfly, and the self-purge structure for preventing the butterfly valve from being blocked is arranged on both sides of the butterfly so that the edges on both sides of the butterfly can be purged and cleaned, and the hollow rotating shaft is rotatably arranged on the side wall of the butterfly.

[0010] Preferably, an upper guide groove and a lower guide groove are provided in the butterfly, and an upper air pipe and a lower air pipe are embedded in the butterfly, wherein the upper air pipe is connected to the interior of the upper guide groove, and the lower air pipe is connected to the interior of the lower guide groove, and the air inlet ends of the upper air pipe and the lower air pipe both penetrate the side wall of the valve stem and extend out, and the end of the support rod away from the fixing ring is fixedly connected to the side wall of the butterfly, and a sleeve is fixedly connected to the valve stem.

[0011] Preferably, the first air inlet pipe is connected to the interior of the lower guide groove.

[0012] The present invention has the following beneficial effects: 1. By arranging a cleaning component and a rotating component on both sides of the butterfly, the rotating component can be used to drive the cleaning component to rotate around the butterfly, and the shovel plate in the cleaning component can effectively shovel away the sticky impurities at the edge of the butterfly to avoid the accumulation of impurities and the difficulty of rotating the butterfly; 2. By setting up the spray assembly, after the shovel plate scoops up the impurities around the edge of the butterfly, the spray assembly can blow these impurities off in time to avoid the accumulation of impurities on the shovel plate and affect its cleaning effect, ensuring that the shovel plate can continuously and effectively clean the edges around the butterfly. At the same time, the spray assembly can also blow up some impurities with weaker viscosity, which can improve the cleaning efficiency of the butterfly by this device; 3. By setting up components such as a lifting rod, a spring, a pressure plug and a second air intake pipe, the kinetic energy of the airflow when discharged can be used to apply pressure to the pressure plug. In this way, the lifting rod can act on the shovel plate, so that the shovel plate can fit tightly with the surface of the butterfly. On the one hand, the cleaning effect of the shovel plate can be increased, and on the other hand, the shovel plate can clean more thoroughly, thereby cleaning the butterfly more cleanly.

[0013] 4. By setting a swing mechanism, when the airflow is concentrated and discharged from the swing pipe, the swing mechanism drives the swing pipe to swing back and forth, so that the airflow discharged from the swing pipe with strong power can cover the entire shovel plate, thereby effectively removing all impurities shoveled by the shovel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the structure of a butterfly valve proposed by the present invention; Figure 2 A schematic diagram of the connection structure of the self-purge structure for preventing the butterfly valve from being blocked and the butterfly piece and the oblique side surface of the valve stem proposed by the present invention; Figure 3 It is a schematic diagram of the front connection structure of a self-purge structure for preventing a butterfly valve from being blocked in the present invention, a butterfly plate and a valve stem; Figure 4 for Figure 3 A schematic diagram of the structure enlargement at point A; Figure 5 It is a schematic diagram of the side structure of a self-purge structure for preventing a butterfly valve from being blocked and a butterfly piece cut inside in the present invention; Figure 6 It is a schematic diagram of the front structure of a self-purge structure for preventing a butterfly valve from being blocked and the internal section of a butterfly piece in the present invention.

[0015] In the figure: 1 valve body, 2 valve stem, 3 upper air pipe, 4 lower air pipe, 5 butterfly, 6 fixing ring, 7 support rod, 8 jet pipe, 9 hollow shaft, 10 second air inlet pipe, 11 shovel plate, 12 arc gear plate, 13 lower guide groove, 14 upper guide groove, 15 spring, 16 pressure plug, 17 lifting rod, 18 first air inlet pipe, 19 air guide pipe, 20 gear, 21 rotary joint, 22 swing pipe, 23 rotating pipe, 24 torsion spring, 25 first air cavity, 26 second air cavity, 27 sleeve. DETAILED DESCRIPTION

[0016] 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.

[0017] Embodiment 1:

[0018] A self-purge structure for preventing a butterfly valve from being blocked, comprising: A cleaning assembly is used to clean impurities at the edge of the butterfly of the butterfly valve. The cleaning assembly includes two shovel plates 11, a hollow rotating shaft 9, two rotating tubes 23 and two lifting rods 17. The rotating tubes 23 are fixedly connected to both sides of the hollow rotating shaft 9, and the rotating tubes 23 are communicated with the inside of the hollow rotating shaft 9. The lower end of the lifting rod 17 is fixedly connected to the shovel plate 11. The lifting rod 17 is arranged inside the rotating tube 23, and the lower end of the lifting rod 17 is sealed and slidable through the side wall of the rotating tube 23; A rotating assembly, which is used to drive the cleaning assembly to rotate around the center of the butterfly plate of the butterfly valve. The rotating assembly includes two jet pipes 8, and the two jet pipes 8 are fixedly connected to the side walls of the two rotating tubes 23, and the jet pipes 8 are connected to the inside of the rotating tubes 23 to which they are fixedly connected. The two jet pipes 8 are symmetrically arranged along the axis of the hollow rotating shaft 9; The spray assembly is used to spray and clean the shovel plate 11 and the edge of the butterfly of the butterfly valve. The spray assembly includes a swing tube 22 and a swing mechanism. A first air cavity 25 is opened in the hollow rotating shaft 9. The swing tube 22 is connected to the first air cavity 25 through the air guide mechanism. The swing mechanism is used to drive the swing tube 22 to swing back and forth.

[0019] A butterfly valve includes the above-mentioned self-purge structure for preventing the butterfly valve from being blocked, and also includes a valve body 1, a valve stem 2 and a butterfly 5, wherein the butterfly 5 is rotatably arranged in the valve body 1, the valve stem 2 is fixedly connected to the butterfly 5, and the self-purge structure for preventing the butterfly valve from being blocked is arranged on both sides of the butterfly 5 so that the edges on both sides of the butterfly 5 can be purged and cleaned.

[0020] In this embodiment, compressed air can be blown into the hollow shaft 9, and the compressed air is delivered to the two jet pipes 8 through the rotating pipes 23 on both sides. Figure 3 Since the two jet pipes 8 are arranged axially symmetrically, the high-speed compressed cleaning sprayed from the jet pipe 8 will exert a reaction force on the rotating pipe 23 and force the rotating pipe 23 and the hollow rotating shaft 9 to rotate around the center of the butterfly 5; The lifting rod 17 disposed in the rotating tube 23 will drive the shovel plate 11 to rotate around the center of the butterfly 5. During the rotation process, the shovel plate 11 can effectively remove and clean the sticky impurities around the edges of the butterfly 5.

[0021] At the same time, the air guide mechanism also delivers compressed air to the first air cavity 25. Figure 6, the compressed air entering the first air chamber 25 will be transported to the swing tube 22 through the air guide mechanism, and finally blown out from the swing tube 22 to the surface of the shovel plate 11 and the circumferential edge of the butterfly 5. At the same time, the swing mechanism drives the swing tube 22 to swing back and forth, which can blow away the sticky impurities just scooped up on the surface of the shovel plate 11 (the connection strength between the impurities just scooped up and the shovel plate 11 is not high, so they can be blown away by the strong compressed airflow). At the same time, the airflow is concentrated and discharged from the swing tube 22 with a strong impact force, and the swing tube 22 swings back and forth, which can increase the blowing range, so that the entire surface of the shovel plate 11 can be effectively and comprehensively covered to thoroughly clean the shovel plate 11. In addition, the compressed airflow blown out from the swing tube 22 can also blow away the impurities with weaker viscosity around the edge of the butterfly 5. Combined with the shoveling and cleaning of the shovel plate 11, the cleaning efficiency of the device for the impurities on the circumferential edge of the butterfly 5 can be improved.

[0022] Embodiment 2:

[0023] Compared with the first embodiment, the hollow shaft 9 in this embodiment is sealed and slidably connected with a press plug 16, the upper end of which is fixedly connected with a spring 15, the upper end of the spring 15 is fixedly connected to the top of the hollow shaft 9, and the end of the lifting rod 17 away from the shovel plate 11 is fixedly connected to the lower end of the press plug 16.

[0024] A second air cavity 26 is formed at the lower end of the hollow shaft 9, and a second air inlet pipe 10 is fixedly connected to the side wall of the hollow shaft 9. One end of the second air inlet pipe 10 is connected to the second air cavity 26, and the other end of the second air inlet pipe 10 is connected to the inside of the hollow shaft 9. Figure 5 As shown, the connecting position between the second air inlet pipe 10 and the hollow rotating shaft 9 is located at the top of the hollow rotating shaft 9, so that when the second air inlet pipe 10 transports air inside the hollow rotating shaft 9, the air pressure can act on the upper side of the pressure plug 16.

[0025] Further, in the initial state of the spring 15, the pressure plug 16 is located above the rotating tube 23. At this time, the air above the pressure plug 16 can be prevented from flowing into the rotating tube 23.

[0026] In addition, an upper guide groove 14 and a lower guide groove 13 are opened in the butterfly 5, and an upper air pipe 3 and a lower air pipe 4 are embedded in the butterfly 5, wherein the upper air pipe 3 is connected to the interior of the upper guide groove 14, and the air inlet ends of the upper air pipe 3 and the lower air pipe 4 both penetrate the side wall of the valve stem 2 and extend out.

[0027] In this embodiment, high-speed compressed air can be distributed to the upper air pipe 3 through air delivery equipment such as an air compressor. Figure 5 and Figure 6 When air is input from the upper air pipe 3, it will enter the upper guide groove 14 through the upper air pipe 3, and enter the second air cavity 26 through the upper guide groove 14. The compressed air entering the second air cavity 26 will be input into the hollow shaft 9 through the second air inlet pipe 10; After the compressed air enters the hollow rotating shaft 9, it will first push the pressure plug 16 downward until the pressure plug 16 moves below the horizontal axis of the rotating tube 23. At this time, the pressure plug 16 no longer blocks the air in the hollow rotating shaft 9 from flowing into the rotating tube 23. The compressed air will flow into the rotating tubes 23 on both sides and finally be discharged outward from the two air injection pipes 8 to achieve the rotating effect of the rotating component in the first embodiment. When the pressure plug 16 is pushed downward by the airflow, the lifting rod 17 will be driven downward, and the lifting rod 17 will drive the shovel plate 11 to move downward together, so that the shoveling surface of the shovel plate 11 can fit more closely with the surface of the butterfly 5, so that the sticky impurities around the edge of the cleaning butterfly 5 can be thoroughly shoveled away. In addition, the downward shoveling force of the shovel plate 11 can be increased, thereby enhancing the cleaning effect of the shovel plate 11.

[0028] Embodiment three:

[0029] Compared with the first and second embodiments, the swing mechanism in this embodiment specifically includes a gear 20, a fixed ring 6 and a plurality of support rods 7. The gear 20 is fixedly connected to the swing tube 22, the support rod 7 is fixedly connected to the inner wall of the fixed ring 6, and one end of the support rod 7 away from the fixed ring 6 is fixedly connected to the side wall of the butterfly 5. The valve stem 2 is fixedly connected with a sleeve 26. Specifically, in combination with Figure 2 The upper air pipe 3 and the lower air pipe 4 can pass through the valve stem 2 and enter the sleeve 27, and are respectively arranged on the left and right sides of the sleeve 27.

[0030] A plurality of arc-shaped tooth plates 12 are fixedly connected to the circumferential side wall of the fixed ring 6, and the gear 20 cooperates with the arc-shaped tooth plates 12. Specifically, the arc-shaped tooth plates 12 are evenly spaced along the circumference of the fixed ring 6. A rotary joint 21 is fixedly connected to the upper end of the swing tube 22, and the rotary joint 21 is connected to the side wall of the rotating tube 23 through a torsion spring 24. Specifically, one end of the torsion spring 24 is fixedly connected to the side wall of the rotary joint 21, and the other end of the torsion spring 24 is fixedly connected to the side wall of the rotating tube 23.

[0031] The swing pipe 22 is connected to the rotary joint 21. The air guide mechanism includes an air guide pipe 19, which is rotatably connected to the rotary joint 21, and the air guide pipe 19 is connected to the rotary joint 21, and the air guide pipe 19 is connected to the first air cavity 25, and the first air cavity 25 is also connected to the first air inlet pipe 18. It should be noted that Figure 6 As shown, one end of the air guide tube 19 close to the hollow rotating shaft 9 is fixedly connected to the hollow rotating shaft 9. When the hollow rotating shaft 9 rotates, it can drive the air guide tube 19 to rotate together, and thereby drive the rotary joint 21, gear 20 and swing tube 22 connected to the air guide tube 19 to rotate around the center of the butterfly 5.

[0032] The lower air pipe 4 is communicated with the interior of the lower guide groove 13 , and the first air inlet pipe 18 is communicated with the interior of the lower guide groove 13 .

[0033] In this embodiment, when the air delivery equipment such as the air compressor inputs high-speed compressed air into the lower air pipe 4, Figure 5 and Figure 6 , the compressed air will be input into the lower guide groove 13, and the compressed air entering the lower guide groove 13 can be input into the first air cavity 25 through the first air inlet pipe 18, and then flow to the air guide pipes 19 on both sides, and finally flow into the swing pipe 22 through the rotary joint 21 and then be discharged outward, so as to achieve the spray cleaning effect of the spray assembly in the first embodiment; Furthermore, since the fixing ring 6 is fixed to the side wall of the butterfly 5 by the supporting rods 7, the position of the fixing ring 6 remains unchanged. According to the first embodiment, when the rotating assembly drives the shovel plate 11 and the hollow shaft 9 to rotate around the center of the butterfly 5, the rotating joint 21, the gear 20 and the swing tube 22 on the lower side of the air guide tube 19 are also driven to rotate around the center of the butterfly 5. When the gear 20 rotates around the center of the butterfly 5, it will continuously pass through the arc-shaped tooth plate 12 on the outer wall of the fixing ring 6, as shown in FIG. Figure 3 As shown, at this time, the arc-shaped toothed plate 12 will push the gear 20 to rotate a certain angle, thereby driving the swing tube 22 and the rotary joint 21 to rotate synchronously at a corresponding angle, and tightening the torsion spring 24, and then the gear 20 is separated from the arc-shaped toothed plate 12, and the torsion spring 24 releases elastic potential energy, and drives the rotary joint 21, the gear 20 and the swing tube 22 to rotate and reset. Therefore, under the action of the torsion spring 24, when the gear 20 passes through and separates from each arc-shaped toothed plate 12 in turn, the gear 20 can be rotated back and forth, thereby driving the rotary joint 21 and the swing tube 22 to swing back and forth, and realizing the technical effect of implementing the swing tube 22 to swing back and forth; In addition, it is worth mentioning that, in the present embodiment, the back-and-forth swinging of the swinging tube 22 is achieved by the gear 20 rotating around the center of the butterfly 5 and continuously rotating. Therefore, the back-and-forth swinging frequency of the swinging tube 22 is positively correlated with the rotation speed of the gear 20 rotating around the center, that is, the faster the rotation speed of the rotating component, the higher the back-and-forth swinging frequency of the swinging tube 22. Therefore, when the rotation speed of the rotating component is faster, the speed at which the shovel plate 11 is driven to shovel and clean the impurities around the edge of the butterfly 5 is faster, and the back-and-forth swinging rate of the swinging tube 22 is also higher, so that the sticky impurities removed by the shovel plate 11 can be cleaned timely and effectively.

[0034] 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 self-purge structure for preventing butterfly valve blockage, characterized in that: include: A cleaning assembly, the cleaning assembly is used to clean impurities at the edge of a butterfly blade of a butterfly valve, the cleaning assembly comprises two shovel plates (11), a hollow rotating shaft (9), two rotating tubes (23) and two lifting rods (17), the rotating tubes (23) are fixedly connected to both sides of the hollow rotating shaft (9), and the rotating tubes (23) are communicated with the inside of the hollow rotating shaft (9), the lower ends of the lifting rods (17) are fixedly connected to the shovel plates (11), the lifting rods (17) are arranged inside the rotating tubes (23), and the lower ends of the lifting rods (17) are sealed and slidably penetrate the side wall of the rotating tubes (23); A rotating assembly, the rotating assembly is used to drive the cleaning assembly to rotate around the center of the butterfly leaf of the butterfly valve; A spray assembly is used to spray and clean the shovel plate (11) and the edge of the butterfly blade of the butterfly valve.

2. A self-purge structure for preventing butterfly valve blockage according to claim 1, characterized in that: A press plug (16) is sealingly and slidably connected inside the hollow rotating shaft (9), and a spring (15) is fixedly connected to the upper end of the press plug (16). The upper end of the spring (15) is fixedly connected to the top of the hollow rotating shaft (9), and the end of the lifting rod (17) away from the shovel plate (11) is fixedly connected to the lower end of the press plug (16); The rotating assembly comprises two air jet pipes (8), and the two air jet pipes (8) are fixedly connected to the side walls of two rotating tubes (23), and the air jet pipes (8) are communicated with the interior of the rotating tubes (23) to which they are fixedly connected, and the two air jet pipes (8) are symmetrically arranged along the axis of the hollow rotating shaft (9); The spray assembly comprises an oscillating tube (22) and an oscillating mechanism. A first air cavity (25) is provided in the hollow rotating shaft (9). The oscillating tube (22) is connected to the first air cavity (25) via the air guide mechanism. The oscillating mechanism is used to drive the oscillating tube (22) to oscillate back and forth.

3. A self-purge structure for preventing butterfly valve blockage according to claim 2, characterized in that: The swing mechanism comprises a gear (20), a fixed ring (6) and a plurality of support rods (7); the gear (20) is fixedly connected to a swing tube (22); the support rod (7) is fixedly connected to the inner wall of the fixed ring (6); a plurality of arc-shaped tooth plates (12) are fixedly connected to the circumferential side wall of the fixed ring (6); the gear (20) and the arc-shaped tooth plates (12) cooperate with each other; a rotating joint (21) is fixedly connected to the upper end of the swing tube (22); the rotating joint (21) is connected to the side wall of the rotating tube (23) via a torsion spring (24); and the swing tube (22) is in communication with the rotating joint (21).

4. A self-purge structure for preventing butterfly valve blockage according to claim 3, characterized in that: The air guide mechanism comprises an air guide pipe (19), the air guide pipe (19) being rotatably connected to a rotary joint (21), the air guide pipe (19) being in communication with the rotary joint (21), the air guide pipe (19) being in communication with a first air cavity (25), and the first air cavity (25) being further in communication with a first air inlet pipe (18).

5. A self-purge structure for preventing butterfly valve blockage according to claim 2, characterized in that: A second air cavity (26) is formed at the lower end of the hollow rotating shaft (9), and a second air inlet pipe (10) is fixedly connected to the side wall of the hollow rotating shaft (9); one end of the second air inlet pipe (10) is in communication with the second air cavity (26), and the other end of the second air inlet pipe (10) is in communication with the interior of the hollow rotating shaft (9).

6. A butterfly valve, comprising the self-purge structure for preventing butterfly valve blockage according to any one of claims 1 to 5, characterized in that: The valve also comprises a valve body (1), a valve stem (2) and a butterfly (5), wherein the butterfly (5) is rotatably arranged in the valve body (1), the valve stem (2) is fixedly connected to the butterfly (5), and a self-purge structure for preventing the butterfly valve from being blocked is arranged on both sides of the butterfly (5) so that both sides of the edge of the butterfly (5) can be purged and cleaned, and the hollow rotating shaft (9) is rotatably arranged on the side wall of the butterfly (5).

7. A butterfly valve according to claim 6, characterized in that: An upper guide groove (14) and a lower guide groove (13) are provided in the butterfly (5), and an upper air pipe (3) and a lower air pipe (4) are embedded in the butterfly (5), wherein the upper air pipe (3) is communicated with the interior of the upper guide groove (14), and the lower air pipe (4) is communicated with the interior of the lower guide groove (13), and the air inlet ends of the upper air pipe (3) and the lower air pipe (4) both penetrate the side wall of the valve stem (2) and extend out, and one end of the support rod (7) away from the fixing ring (6) is fixedly connected to the side wall of the butterfly (5), and a sleeve (27) is fixedly connected to the valve stem (2).

8. A butterfly valve according to claim 7, characterized in that: The first air inlet pipe (18) is in communication with the interior of the lower guide groove (13).

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