CN113606354A

CN113606354A - Fan-shaped valve plate type flow control valve

Info

Publication number: CN113606354A
Application number: CN202110757974.4A
Authority: CN
Inventors: 王建建
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-11-05

Abstract

The invention belongs to the technical field of valves, and particularly relates to a sector valve plate type flow control valve which comprises a valve body, a first sector valve plate, a second sector valve plate, a worm, a servo motor, a first sealing ring and a second sealing ring; the worm is driven to rotate by starting the servo motor, the worm rotates to drive the second fan-shaped valve plate to rotate, and the first fan-shaped valve plate is fixedly connected with the valve body, so that the second fan-shaped valve plate rotates to enable the first fan-shaped valve plate and the second fan-shaped valve plate to move relatively, and the opening and closing of the flow control valve can be controlled; transmit the signal of telecommunication for servo motor through the controller, can control the turned angle of No. two fan-shaped valve plates, and then control open-ended area between fan-shaped valve plate and No. two fan-shaped valve plates, and then make this flow control valve can control the flow through the valve body, and when No. two fan-shaped valve plate turned angle, the atress on No. two fan-shaped valve plates is even, and then has avoided causing No. two fan-shaped valve plates to warp the damage when pressure is too big.

Description

Fan-shaped valve plate type flow control valve

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a fan-shaped valve plate type flow control valve.

Background

Valves are plumbing accessories used to open and close a pipe, control flow direction, regulate and control parameters of the transport medium (temperature, pressure and flow). The flow control valve is a valve which controls the flow of a throttling port by changing the size of a hydraulic resistance of the throttling port under a certain pressure difference so as to adjust the movement speed of an actuating element (a hydraulic cylinder or a hydraulic motor). The system mainly comprises a throttle valve, a speed regulating valve, an overflow throttle valve, a flow distributing and collecting valve and the like. The installation form is horizontal installation. The connection mode is divided into a flange type and a thread type; and (4) welding. The control and regulation modes are automatic and manual.

Most of the existing flow control valves control the flow of a throttling orifice by changing the size of a liquid resistance of the throttling orifice, and when the required flow is small, the flow is controlled by the amount of the valve plate packed up such as a butterfly valve, a gate valve and the like, so that the valve plate is stressed unevenly, and the valve plate is deformed and damaged easily when the pressure is overlarge; according to the invention, the fan-shaped valve plate type flow control valve is used for controlling the liquid flow, and the fan-shaped valve plate is rotated, so that the flow passing through the valve body can be accurately controlled, the uniform stress of the valve plate can be ensured, and the valve plate is prevented from being deformed and damaged when the pressure is overlarge.

Disclosure of Invention

In order to make up the defects of the prior art, the invention provides a flow control valve with a sector valve plate. The invention is mainly used for solving the problem that the valve plate is easy to deform and damage due to large pressure difference when small flow is needed in a pipeline in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a fan-shaped valve plate type flow control valve comprises a valve body, a first fan-shaped valve plate, a second fan-shaped valve plate, a worm, a servo motor, a first sealing ring and a second sealing ring; the first fan-shaped valve plate is arranged in the middle of the valve body; the first fan-shaped valve plate is fixedly connected with the valve body; one side of the first fan-shaped valve plate is provided with the second fan-shaped valve plate; the second fan-shaped valve plate is rotationally connected with the first fan-shaped valve plate; the outer ring of the second fan-shaped valve plate is provided with a connecting part; one side of the valve body is provided with the worm; the worm is rotationally connected with the valve body; one end of the worm is connected with the servo motor; the servo motor is fixedly connected outside the valve body; the worm is meshed with the connecting part; the first sealing ring is arranged between the second fan-shaped valve plate and the valve body; the first sealing ring is fixedly connected with the valve body; no. two sealing washers are arranged between the first sector valve plate and the second sector valve plate.

When the flow control valve works, the servo motor is started to drive the worm to rotate, the worm rotates to drive the second fan-shaped valve plate to rotate, and the first fan-shaped valve plate is fixedly connected with the valve body, so that the second fan-shaped valve plate rotates to enable the first fan-shaped valve plate and the second fan-shaped valve plate to move relatively, the opening and closing of the flow control valve can be controlled, and the flow control valve is less influenced by the external environment through mechanical control; because this flow control valve is servo motor control, so be when this flow control valve is in the less flow of control, can give servo motor with the signal of telecommunication through the controller, the turned angle of fan-shaped valve plate No. two of accurate control, and then the open-ended area between fan-shaped valve plate and the fan-shaped valve plate No. two of control, and then make this flow control valve can control the flow through the valve body, and when fan-shaped valve plate turned angle No. two, the atress on the fan-shaped valve plate No. two is even, and then avoided causing fan-shaped valve plate No. two to warp the damage when pressure is too big.

Preferably, the connecting part is annular; the outer ring of the connecting part is provided with worm gear teeth; the connecting part is fixedly connected with the second fan-shaped valve plate; the worm gear teeth are engaged with the worm.

The second fan-shaped valve plate is arranged to be of a split structure and can be formed by assembling, so that the second fan-shaped valve plate is convenient to process and manufacture; because No. two fan-shaped valve plate outer lanes need with the worm meshing, so the required precision of worm wheel teeth on the connecting portion is higher, sets up No. two fan-shaped valve plates and is split type, can come with the worm meshing through the higher worm wheel teeth of machining precision in addition, can also make connecting portion by the higher material of use intensity, and then increased the life of No. two fan-shaped valve plates.

Preferably, an inclined groove is formed in the outer ring of the first fan-shaped valve plate; one side of the second sealing ring is in contact with the inclined groove; the other side of the second sealing ring is in contact with the first fan-shaped valve plate.

The second sealing ring is placed in the inclined groove of the first fan-shaped valve plate, and when the second fan-shaped valve plate is opened, the second sealing ring ensures that liquid in the valve body cannot flow into the worm position and the outside of the valve body; when No. two fan-shaped valve plates were closed, because flow control valve prevents liquid outflow, made the increase of pressure in the valve body, the inside pressure of valve body made No. two sealing washers expand, extruded No. two sealing washers on the inclined groove of a fan-shaped valve plate, and then made No. two sealing washers inseparabler with the contact of a fan-shaped valve plate and No. two fan-shaped valve plates, strengthened the sealed effect of No. two sealing washers.

Preferably, the middle part of the second sealing ring is provided with a support ring; the outer ring of the support ring is provided with elastic pieces at uniform intervals along the circumferential direction; the elastic sheet is abutted against the second sealing ring;

the middle part of the second sealing ring is provided with a support ring which supports the second sealing ring, so that the second sealing ring is prevented from being bent during sealing, and the sealing stability of the second sealing ring is ensured; because the support ring outer lane is provided with the shell fragment, so the support ring can realize elastic support to No. two sealing washers, makes No. two sealing washers inseparabler with the contact of a fan-shaped valve plate and No. two fan-shaped valve plates, and then has strengthened the sealed effect of No. two sealing washers.

Preferably, a reinforcing part is arranged on the second fan-shaped valve plate; the reinforcing part is a boss with the thickness gradually decreasing from the middle to the outside.

The second fan-shaped valve plate is provided with the reinforcing part, so that the strength of the second fan-shaped valve plate is improved, when the second fan-shaped valve plate is closed to seal the valve body, the second fan-shaped valve plate is prevented from being extruded and deformed by high pressure of liquid, and the safety and stability of the flow control valve are ensured; because the surface of rib is streamlined, when No. two fan-shaped valve plates were opened, liquid flowed through from No. two fan-shaped valve plates, and the circular conical rib can reduce the resistance of No. two fan-shaped valve plates to liquid, and then makes more smooth and easy the flowing through valve body of liquid, and the circular conical rib can reduce the pressure that No. two fan-shaped valve plates received, avoids higher pressure to make No. two fan-shaped valve plate damage.

Preferably, the valve body is of a split structure; convex edges are symmetrically arranged on two sides of the joint of the valve body; the surface of the convex edge is an inclined plane; the convex edges are connected through a tightening ring; and a third sealing ring is arranged at the joint of the valve body.

The valve body is arranged in a split structure, so that the valve body is convenient to disassemble and assemble, and the parts in the valve body are convenient to assemble and replace; the convex edge with the inclined surface is arranged at the joint of the valve bodies, the convex edge is connected through the tightening ring, and the convex edge can be gradually compressed in the process of pre-tightening the tightening ring, so that the valve bodies on two sides are connected more tightly through the third sealing ring at the joint of the valve bodies, and the sealing property of the valve bodies is improved; the valve body is fixed by the tightening ring, so that the pressing force of a circle of the joint of the valve body is uniformly distributed, and the deformation of the valve body caused by nonuniform stress of the valve body for a long time is avoided.

Preferably, a threaded hole is formed in the middle of the second fan-shaped valve plate; a rotating bolt is connected in the threaded hole in a threaded manner; the rotating bolt is rotationally connected with the first fan-shaped valve plate; and the rotating bolt is provided with a ball.

The second fan-shaped valve plate is rotationally connected with the first fan-shaped valve plate through the rotating bolt, and the rotating bolt is in threaded connection with the second fan-shaped valve plate, so that the second fan-shaped valve plate is prevented from falling off after being rotated for a long time; the ball is arranged on the rotating bolt, and the ball rolls between the rotating bolt and the first fan-shaped valve plate, so that the friction force between the second fan-shaped valve plate and the first fan-shaped valve plate is reduced, and the second fan-shaped valve plate can rotate conveniently.

The invention has the following beneficial effects:

1. according to the flow control valve, the worm is driven to rotate by starting the servo motor, the worm rotates to drive the second fan-shaped valve plate to rotate, and the first fan-shaped valve plate is fixedly connected with the valve body, so that the second fan-shaped valve plate rotates to enable the first fan-shaped valve plate and the second fan-shaped valve plate to move relatively, the opening and closing of the flow control valve can be controlled, and the flow control valve is less influenced by the external environment through mechanical control; because this flow control valve is servo motor control, so be when this flow control valve is in the less flow of control, can give servo motor with the signal of telecommunication through the controller, the turned angle of fan-shaped valve plate No. two of accurate control, and then the open-ended area between fan-shaped valve plate and the fan-shaped valve plate No. two of control, and then make this flow control valve can control the flow through the valve body, and when fan-shaped valve plate turned angle No. two, the atress on the fan-shaped valve plate No. two is even, and then avoided causing fan-shaped valve plate No. two to warp the damage when pressure is too big.

2. According to the invention, the second fan-shaped valve plate is of a split structure and can be formed by assembling, so that the second fan-shaped valve plate is convenient to process and manufacture; because No. two fan-shaped valve plate outer lanes need with the worm meshing, so the required precision of worm wheel teeth on the connecting portion is higher, sets up No. two fan-shaped valve plates and is split type, can come with the worm meshing through the higher worm wheel teeth of machining precision in addition, can also make connecting portion by the higher material of use intensity, and then increased the life of No. two fan-shaped valve plates.

3. According to the invention, the second sealing ring is arranged in the inclined groove of the first fan-shaped valve plate, and when the second fan-shaped valve plate is opened, the second sealing ring ensures that liquid in the valve body cannot flow into the worm position and the outside of the valve body; when No. two fan-shaped valve plates were closed, because flow control valve prevents liquid outflow, made the increase of pressure in the valve body, the inside pressure of valve body made No. two sealing washers expand, extruded No. two sealing washers on the inclined groove of a fan-shaped valve plate, and then made No. two sealing washers inseparabler with the contact of a fan-shaped valve plate and No. two fan-shaped valve plates, strengthened the sealed effect of No. two sealing washers.

4. According to the invention, the support ring is arranged in the middle of the second sealing ring and supports the second sealing ring, so that the second sealing ring is prevented from being bent during sealing, and the sealing stability of the second sealing ring is ensured; because the support ring outer lane is provided with the shell fragment, so the support ring can realize elastic support to No. two sealing washers, makes No. two sealing washers inseparabler with the contact of a fan-shaped valve plate and No. two fan-shaped valve plates, and then has strengthened the sealed effect of No. two sealing washers.

5. According to the invention, the reinforcing part is arranged on the second fan-shaped valve plate, so that the strength of the second fan-shaped valve plate is improved, when the second fan-shaped valve plate is closed to seal the valve body, the second fan-shaped valve plate is prevented from being extruded and deformed by high pressure of liquid, and the safety and stability of the flow control valve are ensured; because the surface of rib is streamlined, when No. two fan-shaped valve plates were opened, liquid flowed through from No. two fan-shaped valve plates, and the circular conical rib can reduce the resistance of No. two fan-shaped valve plates to liquid, and then makes more smooth and easy the flowing through valve body of liquid, and the circular conical rib can reduce the pressure that No. two fan-shaped valve plates received, avoids higher pressure to make No. two fan-shaped valve plate damage.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a schematic view showing the overall construction of a flow control valve according to the present invention;

FIG. 2 is a schematic view showing an internal structure of a flow control valve according to the present invention;

FIG. 3 is a schematic view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of the worm and valve body of the present invention;

FIG. 5 is a schematic structural view of a second sector valve plate and a second sealing ring in the invention;

FIG. 6 is a schematic structural diagram of a No. two seal ring and a support ring in the invention;

FIG. 7 is a schematic structural view of a sector valve plate No. two in the present invention;

in the figure: the valve comprises a valve body 1, a first fan-shaped valve plate 2, a second fan-shaped valve plate 3, a worm 4, a servo motor 5, a first sealing ring 6, a second sealing ring 7, a connecting part 8, worm gear teeth 10, an inclined groove 11, a support ring 12, an elastic sheet 13, a reinforcing part 14, a convex edge 15, a clamping ring 16, a rotating bolt 17 and balls 18.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1, 2 and 3, a sector valve plate type flow control valve comprises a valve body 1, a first sector valve plate 2, a second sector valve plate 3, a worm 4, a servo motor 5, a first sealing ring 6 and a second sealing ring 7; the first fan-shaped valve plate 2 is arranged in the middle of the valve body 1; the first fan-shaped valve plate 2 is fixedly connected with the valve body 1; the second fan-shaped valve plate 3 is arranged on one side of the first fan-shaped valve plate 2; the second fan-shaped valve plate 3 is rotationally connected with the first fan-shaped valve plate 2; the outer ring of the second fan-shaped valve plate 3 is provided with a connecting part 8; one side of the valve body 1 is provided with the worm 4; the worm 4 is rotationally connected with the valve body 1; one end of the worm 4 is connected with the servo motor 5; the servo motor 5 is fixedly connected outside the valve body 1; the worm 4 is meshed with the connecting part 8; the first sealing ring 6 is arranged between the second fan-shaped valve plate 3 and the valve body 1; the first sealing ring 6 is fixedly connected with the valve body 1; no. two sealing washer 7 sets up between No. one fan-shaped valve plate 2 and No. two fan-shaped valve plate 3.

When the flow control valve works, the servo motor 5 is started to drive the worm 4 to rotate, the worm 4 rotates to drive the second fan-shaped valve plate 3 to rotate, and the first fan-shaped valve plate 2 is fixedly connected with the valve body 1, so that the second fan-shaped valve plate 3 rotates to enable the first fan-shaped valve plate 2 and the second fan-shaped valve plate 3 to move relatively, the opening and closing of the flow control valve can be controlled, and the flow control valve is slightly influenced by the external environment through mechanical control; because this flow control valve is servo motor 5 control, so be when this flow control valve is in the less flow of control, can give servo motor 5 with the signal of telecommunication through the controller, accurate control No. two fan-shaped valve plate 3's turned angle, and then control open-ended area between No. one fan-shaped valve plate 2 and No. two fan-shaped valve plates 3, and then make this flow control valve can control the flow through valve body 1, and when No. two fan-shaped valve plate 3 turned angle, the atress on No. two fan-shaped valve plates 3 is even, and then avoided causing No. two fan-shaped valve plates 3 to warp the damage when pressure is too big.

As shown in fig. 2 and 7, the connecting portion 8 has an annular shape; the outer ring of the connecting part 8 is provided with worm gear teeth 10; the connecting part 8 is fixedly connected with the second fan-shaped valve plate 3; the worm gear teeth 10 mesh with the worm 4.

The second fan-shaped valve plate 3 is arranged to be of a split structure, and the second fan-shaped valve plate 3 can be formed by assembling, so that the second fan-shaped valve plate 3 can be conveniently processed and manufactured; because No. two fan-shaped valve plate 3 outer lanes need with the worm 4 meshing, so the required precision of worm wheel tooth 10 on the connecting portion 8 is higher, sets up No. two fan-shaped valve plate 3 and is split type, can come with the worm 4 meshing through the higher worm wheel tooth 10 of machining precision in addition, can also make connecting portion 8 with the higher material of strength, and then increased No. two fan-shaped valve plate 3's life.

As shown in fig. 2 and 5, an inclined groove 11 is arranged on the outer ring of the first sector valve plate 2; one side of the second sealing ring 7 is contacted with the inclined groove 11; the other side of the second sealing ring 7 is in contact with the first fan-shaped valve plate 2.

The second sealing ring 7 is placed in the inclined groove 11 of the first fan-shaped valve plate 2, and when the second fan-shaped valve plate 3 is opened, the second sealing ring 7 ensures that liquid in the valve body 1 cannot flow into the position of the worm 4 and the outside of the valve body 1; when No. two fan-shaped valve plates 3 were closed, because flow control valve prevents liquid outflow, made the increase of pressure in the valve body 1, the inside pressure of valve body 1 made No. two sealing washer 7 expand, extruded No. two sealing washer 7 on the inclined groove 11 of a fan-shaped valve plate 2, and then made No. two sealing washer 7 inseparabler with the contact of a fan-shaped valve plate 2 and No. two fan-shaped valve plates 3, strengthened No. two sealing washer 7's sealed effect.

As shown in fig. 2, 5 and 6, a support ring 12 is arranged in the middle of the second sealing ring 7; the outer ring of the support ring 12 is provided with elastic sheets 13 at even intervals along the circumferential direction; the elastic sheet 13 is abutted against the second sealing ring 7;

a support ring 12 is arranged in the middle of the second sealing ring 7, and the second sealing ring 7 is supported by the support ring 12, so that the second sealing ring 7 is prevented from being bent during sealing, and the sealing stability of the second sealing ring 7 is ensured; because the outer ring of the support ring 12 is provided with the elastic sheet 13, the support ring 12 can elastically support the second sealing ring 7, so that the second sealing ring 7 is in closer contact with the first fan-shaped valve plate 2 and the second fan-shaped valve plate 3, and the sealing effect of the second sealing ring 7 is further enhanced.

As shown in fig. 2 and 7, a reinforcing part 14 is arranged on the second sector valve plate 3; the reinforcement portion 14 is a boss having a thickness gradually decreasing from the center outward.

The reinforcing part 14 is arranged on the second fan-shaped valve plate 3, so that the strength of the second fan-shaped valve plate 3 is improved, when the second fan-shaped valve plate 3 is closed to seal the valve body 1, the second fan-shaped valve plate 3 is prevented from being extruded and deformed by high pressure of liquid, and the safety and stability of the flow control valve are ensured; because the surface of reinforcement 14 is streamlined, when No. two fan-shaped valve plates 3 were opened, liquid flowed through from No. two fan-shaped valve plates 3, and the circular conical reinforcement 14 can reduce the resistance of No. two fan-shaped valve plates 3 to liquid, and then made more smooth flow through valve body 1 of liquid, and circular conical reinforcement 14 can reduce the pressure that No. two fan-shaped valve plates 3 received, avoids higher pressure to make No. two fan-shaped valve plates 3 damage.

As shown in fig. 2 and 3, the valve body 1 is a split structure; convex edges 15 are symmetrically arranged on two sides of the joint of the valve body 1; the surface of the convex edge 15 is an inclined plane; the flanges 15 are connected by a clamping ring 16; and a third sealing ring is arranged at the joint of the valve body 1.

The valve body 1 is arranged to be of a split structure, so that the valve body 1 is convenient to disassemble and assemble, and the internal parts of the valve body 1 are convenient to assemble and replace; the convex edge 15 with the inclined surface is arranged at the joint of the valve body 1, the convex edge 15 is connected through the clamping ring 16, and the convex edge 15 is gradually pressed in the pre-tightening process of the clamping ring 16, so that the valve body 1 at two sides is more tightly connected through the third sealing ring at the joint of the valve body 1, and the sealing property of the valve body 1 is improved; the valve body 1 is fixed by the clamping ring 16, so that the pressing force of a circle of the joint of the valve body 1 is uniformly distributed, and the deformation of the valve body 1 caused by nonuniform stress of the valve body 1 for a long time is avoided.

As shown in fig. 2 and 7, a threaded hole is formed in the middle of the second sector valve plate 3; a rotating bolt 17 is connected with the inner thread of the threaded hole; the rotating bolt 17 is rotatably connected with the first fan-shaped valve plate 2; the turning bolt 17 is provided with a ball 18.

The second fan-shaped valve plate 3 is rotatably connected with the first fan-shaped valve plate 2 through a rotating bolt 17, and the second fan-shaped valve plate 3 is prevented from falling off after long-time rotation due to the fact that the rotating bolt 17 is in threaded connection with the second fan-shaped valve plate 3; the ball 18 is arranged on the rotating bolt 17, and the ball 18 rolls between the rotating bolt 17 and the first fan-shaped valve plate 2, so that the friction force between the second fan-shaped valve plate 3 and the first fan-shaped valve plate 2 is reduced, and the second fan-shaped valve plate 3 can rotate conveniently.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A fan-shaped valve plate type flow control valve is characterized in that: the valve comprises a valve body (1), a first fan-shaped valve plate (2), a second fan-shaped valve plate (3), a worm (4), a servo motor (5), a first sealing ring (6) and a second sealing ring (7); the first fan-shaped valve plate (2) is arranged in the middle of the valve body (1); the first fan-shaped valve plate (2) is fixedly connected with the valve body (1); one side of the first fan-shaped valve plate (2) is provided with the second fan-shaped valve plate (3); the second fan-shaped valve plate (3) is rotationally connected with the first fan-shaped valve plate (2); the outer ring of the second fan-shaped valve plate (3) is provided with a connecting part (8); one side of the valve body (1) is provided with the worm (4); the worm (4) is rotationally connected with the valve body (1); one end of the worm (4) is connected with the servo motor (5); the servo motor (5) is fixedly connected outside the valve body (1); the worm (4) is meshed with the connecting part (8); the first sealing ring (6) is arranged between the second fan-shaped valve plate (3) and the valve body (1); the first sealing ring (6) is fixedly connected with the valve body (1); no. two sealing washer (7) set up between fan-shaped valve plate (2) of a number one and No. two fan-shaped valve plate (3).

2. A sector plate flow control valve in accordance with claim 1, wherein: the connecting part (8) is annular; worm gear teeth (10) are arranged on the outer ring of the connecting part (8); the connecting part (8) is fixedly connected with the second fan-shaped valve plate (3); the worm gear teeth (10) are meshed with the worm (4).

3. A sector plate flow control valve in accordance with claim 2, wherein: an inclined groove (11) is formed in the outer ring of the first fan-shaped valve plate (2); one side of the second sealing ring (7) is in contact with the inclined groove (11); the other side of the second sealing ring (7) is in contact with the first fan-shaped valve plate (2).

4. A sector plate flow control valve according to claim 3, wherein: a support ring (12) is arranged in the middle of the second sealing ring (7); the outer ring of the support ring (12) is provided with spring plates (13) at uniform intervals along the circumferential direction; the elastic sheet (13) is abutted against the second sealing ring (7).

5. A sector plate flow control valve according to claim 4, wherein: a reinforcing part (14) is arranged on the second fan-shaped valve plate (3); the thickness of the reinforcement (14) gradually decreases from the middle to the outside.

6. A sector plate flow control valve according to claim 5, wherein: the valve body (1) is of a split structure; convex edges (15) are symmetrically arranged on two sides of the joint of the valve body (1); the surface of the convex edge (15) is an inclined plane; the convex edges (15) are connected through a clamping ring (16); and a third sealing ring is arranged at the joint of the valve body (1).

7. A sector plate flow control valve according to claim 6, wherein: the middle part of the second fan-shaped valve plate (3) is provided with a threaded hole; a rotating bolt (17) is connected with the internal thread of the threaded hole; the rotating bolt (17) is rotatably connected with the first fan-shaped valve plate (2); and the rotating bolt (17) is provided with a ball (18).