A volute-type air supply structure for an in-hole energy dissipation valve

Abstract

The present invention discloses a volute-type air supply structure for an in-hole energy dissipation valve, belonging to the technical field of valves. The structure comprises a valve body, a flow guide hood provided at one end of the valve body, the flow guide hood being fixedly connected to the valve body by bolts, a flow guide cone provided within the valve body, a first conical volute groove provided within the flow guide hood, the first conical volute groove being located between the outer circumferential surface of the flow guide cone and the inner circumferential surface of the flow guide hood, a plurality of L-shaped air supply pipes passing through the outer circumferential surface of the flow guide hood, one end of the L-shaped air supply pipe being fixedly connected to the side of the first conical volute groove, and the L-shaped air supply pipes being connected to the first conical volute groove. The present invention has the effect of reducing the occurrence of cavitation in the valve cavity, thereby reducing the vibration and noise caused by it.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a volute-type air supply structure of an in-hole energy dissipation valve. Background Art

[0002] Fixed cone valves are widely used in power stations and water discharge pipelines due to their excellent flow capacity and near-linear flow regulation. Now more and more projects are installing fixed cone valves in pipes.

[0003] However, due to the complex flow in the internal flow field of the fixed cone valve, the high-speed jet near the guide cone enters the suddenly expanded area, which is very likely to form a strong vortex flow and produce a significant negative pressure area, causing the local pressure to drop to the saturated vapor pressure of the fluid at this temperature. At this time, the pressure outside the core of the microbubble in the fluid is less than the pressure inside the core. The microbubble grows and develops rapidly under the pressure difference between the inside and outside of the core and forms cavitation. The cavitation moves along the flow channel to the high-pressure area of the tail flow and quickly collapses. This process of cavitation growth and collapse is called cavitation, which causes the fixed cone valve to generate vibration and noise during use, affecting the working environment of the staff. Summary of the Invention

[0004] In order to improve the problem that the fixed conical valve generates vibration and noise during use, which affects the working environment of the staff, the present application provides a volute-type air supply structure for an in-hole energy dissipation valve.

[0005] The volute-type air supply structure of the in-hole energy dissipation valve provided in this application adopts the following technical solutions:

[0006] A volute-type air-supply structure of an in-hole energy dissipation valve includes a valve body, a guide cover is provided at one end of the valve body, the guide cover is fixedly connected to the valve body by bolts, a guide cone is provided in the valve body, a first conical volute groove is provided in the guide cover, the first conical volute groove is located between the outer circumferential surface of the guide cone and the inner circumferential surface of the guide cover, a plurality of L-shaped air-supply pipes are passed through the outer circumferential surface of the guide cover, one end of the L-shaped air-supply pipe is fixedly connected to the side of the first conical volute groove, and the L-shaped air-supply pipe is communicated with the first conical volute groove.

[0007] By adopting the above technical solution, a first conical volute groove is set in the guide cover, and an L-shaped air supply pipe is set on one side of the first conical volute groove, so that one end of the L-shaped air supply pipe is connected to the atmosphere, and the gas enters the first conical volute groove through the L-shaped air supply pipe to form an annular air supply, which has a larger air supply area for the negative pressure area. The conical groove speeds up the air supply speed, which can effectively reduce the pressure difference before and after the valve body, thereby effectively reducing the cavitation phenomenon in the valve cavity, thereby reducing the vibration and noise caused by it, and optimizing the working environment of the staff.

[0008] Preferably, the L-shaped air supply pipe includes a connecting pipe 1 and a connecting pipe 2 fixed on the side of the first conical volute groove, the connecting pipe 2 is communicated with the first conical volute groove, an arc-shaped plate is fixed on the top end of the connecting pipe 2, the top surface of the arc-shaped plate is in contact with the inner circumference of the air guide cover, the top surface of the arc-shaped plate is provided with a plug hole, and the outer circumference of the air guide cover is provided with multiple through holes 1, and the multiple through holes 1 correspond to the multiple L-shaped air supply pipes, the connecting pipe 1 passes through the through hole 1 and the plug hole and is inserted into the end of the connecting pipe 2 away from the first conical volute groove, and the connecting pipe 1 is threadedly connected to the connecting pipe 2.

[0009] By adopting the above technical solution, the first conical volute groove is placed in the guide cover, and then connecting pipe one is passed through through hole one, so that the bottom end of connecting pipe one is inserted into connecting pipe two, and connecting pipe one is rotated, and connecting pipe one is threadedly connected to connecting pipe two, so that the first conical volute groove is fixed in the guide cover, and connecting pipe one and connecting pipe two are detachably connected, so that when the first conical volute groove is damaged, the first conical volute groove can be removed and replaced.

[0010] Preferably, a first conical sealing ring is sleeved and fixed on the outer circumference of the connecting pipe 1, and the outer circumference of the first conical sealing ring abuts against the inner circumference of the through hole 1.

[0011] By adopting the above technical solution, a first conical sealing ring is provided on connecting pipe 1. When connecting pipe 1 and connecting pipe 2 are fixedly connected, the outer peripheral surface of the first conical sealing ring abuts against the inner peripheral surface of through hole 1, thereby sealing between connecting pipe 1 and through hole 1.

[0012] Preferably, an energy dissipation orifice plate is provided in the deflector cover, and the energy dissipation orifice plate is located on the peripheral side of the first conical volute groove. A fixing piece for fixing the energy dissipation orifice plate is provided on the deflector cover.

[0013] By adopting the above technical solution, an energy dissipation orifice plate is arranged in the guide cover. When water flows through the energy dissipation orifice plate, the energy dissipation orifice plate slows down the flow of water, thereby reducing the generation of negative pressure.

[0014] Preferably, the fixing member includes a plurality of fixing plates 1 fixed on the inner circumference of the air deflector, a slot 1 is provided on the side of the fixing plate 1, the end of the energy dissipation orifice plate is clamped in the slot 1, a fixing ring is provided in the air deflector, the outer circumference of the fixing ring is threadedly connected to the inner circumference of the air deflector, a plurality of fixing plates 2 are fixed on the inner circumference of the fixing ring, a slot 2 is provided on the side of the fixing plate 2 close to the fixing plate 1, and the end of the energy dissipation orifice plate away from the fixing plate 1 is inserted into the slot 2.

[0015] By adopting the above technical solution, the energy dissipation orifice plate is placed in the air deflector, one end of the energy dissipation orifice plate is inserted into the first card slot, and then the fixing ring is screwed into the air deflector, so that the fixing ring drives the second fixing plate to move toward the direction close to the air deflector, and the other end of the energy dissipation orifice plate is inserted into the second card slot, thereby fixing the energy dissipation orifice plate in the air deflector.

[0016] Preferably, a second conical volute groove is provided on the peripheral side of the energy dissipation orifice plate, and a plurality of second air supply pipes are provided on the outer peripheral surface of the second conical volute groove. The second air supply pipes are connected to the second conical volute groove, and the end of the second air supply pipe away from the second conical volute groove passes through the outer peripheral surface of the guide cover.

[0017] By adopting the above technical solution, a second conical volute groove is set on the peripheral side of the energy dissipation orifice plate, so that one end of the second air supply pipe is connected to the atmosphere, and the gas enters the first conical volute groove through the second air supply pipe to form an annular air supply, and the negative pressure area is supplied with air, which can further reduce the pressure difference before and after the valve body, thereby further reducing the cavitation phenomenon in the valve cavity, and further reducing the vibration and noise caused by it.

[0018] Preferably, the outer circumference of the air guide cover is provided with a plurality of through holes 2, the second air supply pipe passes through the through hole 2, the outer circumference of the second air supply pipe is fixed with a second conical sealing ring, the outer circumference of the second conical sealing ring is in contact with the inner circumference of the through hole 2, the outer circumference of the second conical volute groove is provided with a plurality of threaded holes, the plurality of threaded holes correspond to the plurality of second air supply pipes, the bottom end of the second air supply pipe is inserted into the threaded hole, and the second air supply pipe is threadedly connected to the inner wall of the threaded hole.

[0019] By adopting the above technical solution, when the second conical volute groove is installed in the air duct, the threaded hole on the second conical volute groove is aligned with the through hole 2, the second air supply pipe is passed through the through hole 2 and inserted into the threaded hole, the second air supply pipe is rotated so that the bottom end of the second air supply pipe is screwed into the threaded hole, and at the same time the second conical sealing ring is moved into the through hole 2 so that the outer peripheral surface of the second conical sealing ring is abutted against the inner peripheral surface of the through hole 2, and the second air supply pipe is detachably connected to the second conical volute groove, so that the second conical volute groove can be removed from the air duct for replacement when it is damaged.

[0020] Preferably, the inner circumference of the air guide cover is provided with a plurality of positioning grooves, the outer circumference of the second conical volute groove is fixed with a plurality of mounting blocks, the top surface of the mounting block is provided with a mounting groove, a positioning block is slidably installed in the mounting groove, the positioning block is inserted in the positioning groove, a spring is fixed on the inner bottom surface of the mounting groove, a circular groove is provided on the top surface of the positioning block, and the top end of the spring is fixed to the inner top surface of the circular groove.

[0021] By adopting the above technical solution, when the second conical volute groove is installed in the air deflector, the positioning block moves in a direction away from the central axis of the air deflector under the action of the elastic force of the spring, so that the positioning block is inserted into the positioning groove, thereby installing the second conical volute groove in the air deflector.

[0022] Preferably, the guide cone includes a conical cylinder, a round rod is fixed to the tip of the conical cylinder, a plurality of guide plates are fixed between the outer circumference of the round rod and the outer circumference of the conical cylinder, an arc-shaped connecting plate is sleeved on the plurality of guide plates, the inner circumference of the arc-shaped connecting plate is fixedly connected to the end of the guide plate away from the round rod, and the inner circumference of the arc-shaped connecting plate is fixedly connected to the inner circumference of the valve body.

[0023] By adopting the above technical solution, when water flows through, multiple guide plates divert the water. When water hits the outer peripheral surface of the cone, the outer peripheral surface of the cone buffers the water, releasing the energy in the water flow, thereby reducing the negative pressure generated when water flows through the valve cavity.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. A first conical volute groove is provided in the guide cover, and an L-shaped air supply pipe is provided on one side of the first conical volute groove. One end of the L-shaped air supply pipe is connected to the atmosphere, so that gas enters the first conical volute groove through the L-shaped air supply pipe to form an annular air supply. This provides a larger air supply area for the negative pressure area. The conical notch accelerates the air supply speed, which can effectively reduce the pressure difference before and after the valve body, thereby effectively reducing the occurrence of valve cavity cavitation, thereby reducing the vibration and noise caused by it, and optimizing the working environment of the staff;

[0026] 2. Place the first conical volute tank in the deflector cover, then pass connecting pipe 1 through through hole 1, insert the bottom end of connecting pipe 1 into connecting pipe 2, rotate connecting pipe 1, and thread connecting pipe 1 and connecting pipe 2 together, thereby fixing the first conical volute tank in the deflector cover. Connecting pipe 1 and connecting pipe 2 are detachably connected, so that when the first conical volute tank is damaged, the first conical volute tank can be removed and replaced;

[0027] 3. Place the energy dissipation orifice plate in the air deflector so that one end of the energy dissipation orifice plate is inserted into the first card slot, then screw the fixing ring into the air deflector so that the fixing ring drives the second fixing plate to move toward the direction close to the air deflector so that the other end of the energy dissipation orifice plate is inserted into the second card slot, thereby fixing the energy dissipation orifice plate in the air deflector. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the volute-type air supply structure of the in-hole energy dissipation valve in an embodiment of the present application.

[0029] Figure 2It is a structural schematic diagram of the guide cone in an embodiment of the present application.

[0030] Figure 3 It is a structural schematic diagram of the L-shaped air supply pipe in an embodiment of the present application.

[0031] Figure 4 It is a structural schematic diagram of the first conical volute groove in the embodiment of the present application.

[0032] Figure 5 yes Figure 4 Enlarged schematic diagram of point A in the middle.

[0033] Figure 6 It is a structural schematic diagram of the energy dissipation orifice plate in an embodiment of the present application.

[0034] Figure 7 It is a structural schematic diagram of the second conical volute groove in the embodiment of the present application.

[0035] Figure 8 It is a cross-sectional view of the air deflector in the embodiment of the present application.

[0036] Figure 9 yes Figure 8 Enlarged schematic diagram of point B in the middle.

[0037] Figure 10 It is a cross-sectional view of the mounting block in the embodiment of the present application.

[0038] Figure numerals: 1, valve body; 2, guide cone; 21, cone; 22, guide plate; 23, arc-shaped connecting plate; 24, round rod; 3, guide cover; 31, first conical volute groove; 32, L-shaped air supply pipe; 321, connecting pipe one; 322, connecting pipe two; 323, arc-shaped plate; 324, plug-in hole; 325, first conical sealing ring; 326, through hole one; 4, energy dissipation orifice plate; 41, fixing plate one; 42, slot one; 43, fixing ring; 44, fixing plate two; 45, slot two; 5, second conical volute groove; 51, threaded hole; 52, through hole two; 53, second air supply pipe; 54, second conical sealing ring; 55, guide rib plate; 6, positioning groove; 61, mounting block; 62, mounting groove; 63, positioning block; 64, circular groove; 65, spring. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-10 This application is described in further detail.

[0040] The embodiment of the present application discloses a volute-type air supply structure of an in-hole energy dissipation valve.

[0041] Reference Figure 1 A volute type air supply structure of an in-hole energy dissipation valve includes a valve body 1 and a guide cover 3 arranged at one end of the valve body 1, and the guide cover 3 is fixedly connected to the valve body 1 by bolts.

[0042] Reference Figure 1 and Figure 2 A guide cone 2 is fixed in the valve body 1, and the guide cone 2 includes a conical cylinder 21. A round rod 24 is fixed to the tip of the conical cylinder 21. A plurality of guide plates 22 are fixed between the outer circumference of the round rod 24 and the outer circumference of the conical cylinder 21. An arc-shaped connecting plate 23 is fixed between two adjacent guide plates 22. The inner circumference of the arc-shaped connecting plate 23 is fixedly connected to the end of the guide plate 22 away from the round rod 24.

[0043] Reference Figure 3 、 Figure 4 and Figure 5 A first conical volute groove 31 is provided in the air deflector 3. The first conical volute groove 31 is located between the outer circumference of the air deflector cone 2 and the inner circumference of the air deflector 3. A plurality of L-shaped air supply pipes 32 are provided on the outer circumference of the air deflector 3. The L-shaped air supply pipes 32 include a connecting pipe 1 321 and a connecting pipe 2 322 fixed on the side of the first conical volute groove 31. The connecting pipe 2 322 is connected to the first conical volute groove 31. An arc-shaped plate 323 is fixed to the top of the connecting pipe 2 322. The outer arc surface of the arc-shaped plate 323 is in contact with the inner circumference of the air deflector 3. A plug hole 324 is provided on the top surface of the arc-shaped plate 323. The inner circumference of the plug hole 324 is coplanar with the inner circumference of the connecting pipe 2 322. The outer circumference of the air deflector 3 is formed with a plurality of through-holes 326, which are evenly spaced along the outer circumference of the air deflector 3. The plurality of through-holes 326 correspond to the plurality of L-shaped air supply pipes 32. The first connecting pipe 321 passes through the first through-hole 326 and the insertion hole 324 and is inserted into the second connecting pipe 322. The first connecting pipe 321 is threadedly connected to the second connecting pipe 322. A first conical sealing ring 325 is fixedly mounted on the outer circumference of the connecting pipe 321, and the outer circumference of the first conical sealing ring 325 abuts the inner circumference of the first through-hole 326.

[0044] Reference Figure 1 and Figure 6 The first conical volute groove 31 is sheathed with an energy dissipation orifice plate 4. A plurality of fixing plates 41 are fixed to the inner circumference of the air deflector 3. The plurality of fixing plates 41 are evenly spaced along the inner circumference of the air deflector 3. A retaining groove 42 is defined on the side of the fixing plate 41. The end of the energy dissipation orifice plate 4 is inserted into the retaining groove 42. A retaining ring 43 is provided within the air deflector 3. The outer circumference of the retaining ring 43 is threadedly connected to the inner circumference of the air deflector 3. A plurality of fixing plates 44 are fixed to the inner circumference of the retaining ring 43. A retaining groove 45 is defined on the side of the fixing plate 44 near the fixing plate 41. The end of the energy dissipation orifice plate 4, away from the fixing plate 41, is inserted into the retaining groove 45.

[0045] Reference Figure 3 and Figure 7The energy dissipation orifice plate 4 is provided with a second conical volute groove 5 on its circumferential side. A plurality of inclined guide ribs 55 are fixed between the second conical volute groove 5 and the relative inner side surfaces of the first conical volute groove 31. The plurality of guide ribs 55 are arranged at equal intervals along the circumference of the second conical volute groove 5. By arranging the guide ribs 55 in the first conical volute groove 31 and the second conical volute groove 5, it is convenient for the diversion and air supply to smoothly surround the entire first conical volute groove 31 and the second conical volute groove 5. The outer circumferential surface of the second conical volute groove 5 is provided with a plurality of threaded holes 51. The plurality of threaded holes 51 are each inserted with a second air supply pipe 53. The second air supply pipe 53 is threadedly connected to the inner wall of the threaded hole 51. The outer circumferential surface of the air guide cover 3 is provided with a plurality of through holes 52. The plurality of through holes 52 correspond to the plurality of second air supply pipes 53. The end of the second air supply pipe 53 away from the second conical volute groove 5 passes through the through hole 52. A second conical sealing ring 54 is fixedly sleeved on the outer circumference of the second air supply pipe 53 , and the outer circumference of the second conical sealing ring 54 abuts against the inner circumference of the second through hole 52 .

[0046] Reference Figure 8 、 Figure 9 and Figure 10 The inner circumference of the air deflector 3 is provided with a plurality of positioning grooves 6, which are arranged at equal intervals along the circumference of the air deflector 3. A plurality of mounting blocks 61 are fixed to the outer circumference of the second conical volute tank 5. A mounting groove 62 is provided on the surface of the mounting block 61 away from the central axis of the second conical volute tank 5. A positioning block 63 is slidably provided in the mounting groove 62. The top end of the positioning block 63 is inserted into the positioning groove 6, and both ends of the top surface of the positioning block 63 are chamfered. Circular grooves 64 are provided on both sides of the bottom surface of the positioning block 63. A spring 65 is fixed to the inner top surface of the circular groove 64, and the bottom end of the spring 65 is fixed to the inner bottom surface of the mounting groove 62.

[0047] The implementation principle of the volute-type air-supply structure of the in-hole energy dissipation valve in the embodiment of the present application is as follows: when water flows from the valve body 1 to the diversion cover 3, the L-shaped air-supply pipe 32 transports the gas to the first conical volute groove 31, so that the gas forms an annular air-supply in the first conical volute groove 31, and the second air-supply pipe 53 transports the gas to the second conical volute groove 5, so that the gas forms an annular air-supply in the second conical volute groove 5. The air outlets of the first conical volute groove 31 and the second conical volute groove 5 are both conical notches, so that the conical notches speed up the filling speed, can effectively reduce the pressure difference before and after the valve body 1, thereby effectively reducing the cavitation phenomenon in the valve cavity, and further reducing the vibration and noise caused by it.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A volute-type air supply structure for an in-hole energy dissipation valve, characterized by: The invention comprises a valve body (1), one end of the valve body (1) is provided with a guide cover (3), the guide cover (3) and the valve body (1) are fixedly connected by bolts, a guide cone (2) is provided in the valve body (1), a first conical volute groove (31) is provided in the guide cover (3), the first conical volute groove (31) is located between the outer peripheral surface of the guide cone (2) and the inner peripheral surface of the guide cover (3), a plurality of L-shaped air supply pipes (32) are passed through the outer peripheral surface of the guide cover (3), one end of the L-shaped air supply pipe (32) is connected to the first conical volute groove (31), and the first conical volute groove (31) is located between the outer peripheral surface of the guide cone (2) and the inner peripheral surface of the guide cover (3). The side of the shell groove (31) is fixedly connected, the L-shaped air supply pipe (32) is connected to the first conical volute groove (31), the L-shaped air supply pipe (32) includes a connecting pipe 1 (321) and a connecting pipe 2 (322) fixed on the side of the first conical volute groove (31), the connecting pipe 2 (322) is connected to the first conical volute groove (31), the top of the connecting pipe 2 (322) is fixed with an arc plate (323), the top surface of the arc plate (323) is in contact with the inner circumference of the deflector (3), and the arc plate (3 23) is provided with a plug hole (324), the outer peripheral surface of the deflector (3) is provided with a plurality of through holes (326), the plurality of through holes (326) correspond to the plurality of L-shaped air supply pipes (32), the connecting pipe (321) passes through the through hole (326) and the plug hole (324) and is inserted into the end of the connecting pipe (322) away from the first conical volute groove (31), the connecting pipe (321) is threadedly connected to the connecting pipe (322), and an energy dissipation orifice plate (4) is provided in the deflector (3) ), the energy dissipation orifice plate (4) is located on the peripheral side of the first conical volute groove (31), the air guide cover (3) is provided with a fixing piece for fixing the energy dissipation orifice plate (4), the peripheral side of the energy dissipation orifice plate (4) is provided with a second conical volute groove (5), the outer peripheral surface of the second conical volute groove (5) is provided with a plurality of second air supply pipes (53), the second air supply pipes (53) are connected to the second conical volute groove (5), and one end of the second air supply pipe (53) away from the second conical volute groove (5) passes through the outer peripheral surface of the air guide cover (3).

2. The volute-type air supply structure of the in-hole energy dissipation valve according to claim 1, characterized in that: A first conical sealing ring (325) is sleeved and fixed on the outer peripheral surface of the connecting pipe (321), and the outer peripheral surface of the first conical sealing ring (325) abuts against the inner peripheral surface of the through hole (326).

3. The volute-type air supply structure of the in-hole energy dissipation valve according to claim 1 is characterized in that: The fixing member comprises a plurality of fixing plates (41) fixed on the inner circumference of the air deflector (3), a side surface of the fixing plate (41) is provided with a card slot (42), the end of the energy dissipation orifice plate (4) is carded in the card slot (42), a fixing ring (43) is provided in the air deflector (3), the outer circumference of the fixing ring (43) is threadedly connected to the inner circumference of the air deflector (3), a plurality of fixing plates (44) are fixed on the inner circumference of the fixing ring (43), a side surface of the fixing plate (44) close to the fixing plate (41) is provided with a card slot (45), and an end of the energy dissipation orifice plate (4) away from the fixing plate (41) is inserted into the card slot (45).

4. The volute-type air supply structure of the in-hole energy dissipation valve according to claim 1 is characterized in that: The outer circumference of the deflector (3) is provided with a plurality of through holes (52), the second air supply pipe (53) passes through the through hole (52), the outer circumference of the second air supply pipe (53) is fixed with a second conical sealing ring (54), the outer circumference of the second conical sealing ring (54) is in contact with the inner circumference of the through hole (52), the outer circumference of the second conical volute groove (5) is provided with a plurality of threaded holes (51), the plurality of threaded holes (51) correspond to the plurality of second air supply pipes (53), the bottom end of the second air supply pipe (53) is inserted into the threaded hole (51), and the second air supply pipe (53) is threadedly connected to the inner wall of the threaded hole (51).

5. The volute-type air supply structure of the in-hole energy dissipation valve according to claim 4 is characterized in that: The inner circumference of the deflector (3) is provided with a plurality of positioning grooves (6), the outer circumference of the second conical volute groove (5) is fixed with a plurality of mounting blocks (61), the top surface of the mounting block (61) is provided with a mounting groove (62), a positioning block (63) is slidably installed in the mounting groove (62), the positioning block (63) is inserted into the positioning groove (6), a spring (65) is fixed to the inner bottom surface of the mounting groove (62), a circular groove (64) is provided on the top surface of the positioning block (63), and the top end of the spring (65) is fixed to the inner top surface of the circular groove (64).

6. The volute-type air supply structure of the in-hole energy dissipation valve according to claim 1, characterized in that: The guide cone (2) includes a cone (21), a round rod (24) is fixed to the tip of the cone (21), a plurality of guide plates (22) are fixed between the outer circumference of the round rod (24) and the outer circumference of the cone (21), an arc-shaped connecting plate (23) is sleeved on the plurality of guide plates (22), the inner circumference of the arc-shaped connecting plate (23) is fixedly connected to one end of the guide plate (22) away from the round rod (24), and the inner circumference of the arc-shaped connecting plate (23) is fixedly connected to the inner circumference of the valve body (1).

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