CN219282443U

CN219282443U - Rotary plate valve

Info

Publication number: CN219282443U
Application number: CN202223565148.9U
Authority: CN
Inventors: 周新明; 宁堃; 孙照富
Original assignee: GRIMN Engineering Technology Research Institute Co Ltd
Current assignee: GRIMN Engineering Technology Research Institute Co Ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-06-30
Anticipated expiration: 2032-12-30

Abstract

The utility model relates to the technical field of vacuum valves, and provides a rotary plate valve which comprises a valve body, wherein the vertical section of the valve body is rectangular and is pentagonal, the right upper corner of the valve body is removed, a medium inflow hole is formed in the left side of the valve body, a medium outflow hole is formed in the bottom of the valve body, an air cylinder is fixed on the outer wall of an inclined surface of the right upper corner of the valve body, a right vertical side wall of the valve body is communicated with a bearing mounting box, and a piston rod of the air cylinder is hinged with a connecting rod; a rotating shaft is rotatably arranged in the bearing mounting box, and the rotating shaft penetrates out of the bearing mounting box backwards and is fixedly connected with the connecting rod; a valve rod and a valve plate are arranged in the valve body, the valve rod is perpendicular to the rotating shaft and is fixedly connected with the middle part of the rotating shaft, a valve plate mounting seat is fixed in the middle part of the top surface of the valve plate, two mounting plates are arranged at the top of the valve plate mounting seat, and the two mounting plates are respectively positioned at the front side and the rear side of the valve rod and are rotationally connected with the valve rod through a pin shaft; the diameter of the valve plate is larger than the inner diameter of the medium outflow hole. The utility model has compact structure, small occupied space, simple structure, convenient operation, durability and low manufacturing cost, can realize large conductance, increase the evacuation speed and improve the sealing performance of the valve.

Description

Rotary plate valve

Technical Field

The utility model relates to the technical field of vacuum valves, in particular to a rotary plate valve.

Background

The vacuum valve is an element used in a vacuum system to regulate the amount of air, and to shut off or connect a pipeline. Vacuum valves are of various kinds and are generally classified according to the structural characteristics, transmission principle, connection mode or use of the valve. Wherein, the vacuum valve is generally divided into the following parts according to the structural characteristics: flapper valve, gate valve, flap valve, butterfly valve, connecting rod valve, barrier valve, gate valve, two-way valve, three-way valve, straight-through valve, angle valve, etc. The basic requirements for a vacuum valve in practical application are: the seal has the advantages of large conductance, reliable seal, simple and convenient operation, good wear resistance of the seal part, long service life and easy cleaning and installation. However, among the most commonly used baffle valves, gate valves, butterfly valves and flap valves at present, the structure of the baffle valve is not compact enough, the volume is larger, the manufacturing cost of the gate valve is higher, the flow conductance is poor due to the fact that the valve plate is blocked in the middle of a pipeline after the butterfly valve is opened, the structure of the flap valve is complex, and the flow conductance is influenced due to the fact that the valve plate is also erected in the pipeline after the butterfly valve is opened.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides the rotary plate valve which is compact in structure, small in occupied space, capable of realizing large conductance, increasing the evacuation speed, improving the sealing performance of the valve, simple in structure, convenient to operate, durable and low in manufacturing cost.

The technical scheme of the utility model is as follows:

the rotary plate valve comprises a valve body 1, wherein the vertical section of the valve body 1 is a pentagon which is obtained by removing the right upper corner of a rectangle, a medium inflow hole 12 is formed in the left side wall of the valve body 1, a medium outflow hole 13 is formed in the bottom of the valve body, a cylinder 2 is fixed on the outer wall of the inclined surface of the right upper corner, a bearing mounting box 14 is communicated with the right vertical side wall, a piston rod of the cylinder 2 is parallel to the outer wall of the inclined surface of the right upper corner and is arranged towards the lower right, a connecting rod 9 is hinged to the tail end of the piston rod, and the connecting rod 9 is positioned behind the bearing mounting box 14;

bearings 15 are fixed on the front side and the rear side of the inside of the bearing mounting box 14, the two bearings 15 are coaxial, the axis is perpendicular to the connecting rod 9, a rotating shaft 10 is arranged in the bearing mounting box 14, the head part and the tail part of the rotating shaft 10 are respectively connected with the bearings 15 on the rear side and the front side, and the head end of the rotating shaft 10 penetrates out of the rear side wall of the bearing mounting box 14 backwards and is fixedly connected with one end, far away from the air cylinder 2, of the connecting rod 9;

a valve rod 7 and a circular valve plate 8 are arranged in the valve body 1, the valve rod 7 is perpendicular to the rotating shaft 10, the head end of the valve rod is fixedly connected with the middle part of the rotating shaft 10, a valve plate mounting seat 16 is fixed in the middle of the top surface of the valve plate 8, two mounting plates 17 which are parallel to each other are arranged at the top of the valve plate mounting seat 16, and the two mounting plates 17 are respectively positioned at the front side and the rear side of the valve rod 7 and are rotationally connected with the valve rod 7 through a pin shaft 4; the diameter of the valve plate 8 is larger than the inner diameter of the medium outflow hole 13.

Further, the axis of the valve rod 7 is horizontal when the piston of the cylinder 2 is at the top dead center, and the axis of the valve rod 7 forms an angle with the axis of the medium inflow hole 12 when the piston of the cylinder 2 is at the bottom dead center.

Further, the included angle is 40-50 degrees.

Further, the included angle is 45 degrees.

Further, an annular sealing groove 19 coaxial with the medium outflow hole 13 is formed in the inner wall of the bottom of the valve body 1, the inner ring diameter of the annular sealing groove 19 is larger than the inner diameter of the medium outflow hole 13, the diameter of the valve plate 8 is larger than the outer ring diameter of the annular sealing groove 19, and a sealing ring 20 is arranged in the annular sealing groove 19.

Further, an annular sealing groove coaxial with the valve plate 8 is formed in the bottom surface of the valve plate 8, and a sealing ring is arranged in the annular sealing groove.

Further, the head and tail of the rotating shaft 10 are circular shaft sections, the middle of the rotating shaft is a square shaft section, the valve rod 7 is a square shaft, and the end face of the head end of the valve rod 7 is connected with the side wall of the square shaft section of the rotating shaft 10 through keys.

Further, the valve rod 7 is provided with a first fine adjustment device 3 at the tail part, a second fine adjustment device 5 between the head end and the pin shaft 4, and a third fine adjustment device 6 between the head end and the second fine adjustment device 5; the first fine tuning device 3, the second fine tuning device 5 and the third fine tuning device 6 are used for limiting the rotation of the valve plate 8 around the pin shaft 4.

Further, the first fine adjustment device 3 includes a first bolt 3-1 and a first nut 3-2, a first circular through hole with an axis perpendicular to the valve rod 7 is provided at the tail of the valve rod 7, the first nut 3-2 is fixed at the bottom of the valve rod 7 and is coaxial with the first circular through hole, the tail of the first bolt 3-1 passes through the first circular through hole from top to bottom and then is in threaded connection with the first nut 3-2, and the tail extends out of the first nut 3-2; the second fine adjustment device 5 comprises a fine adjustment device mounting seat 5-1, a second bolt 5-2 and a second nut 5-3, wherein the fine adjustment device mounting seat 5-1 is horizontally arranged, the rear end of the top surface of the fine adjustment device mounting seat is fixedly connected with the bottom surface of the valve rod 7, the front end of the fine adjustment device mounting seat is positioned below the front side of the valve rod 7, a second circular through hole is formed in the fine adjustment device mounting seat 5-1, the second nut 5-3 is fixed at the top of the fine adjustment device mounting seat 5-1 and is coaxial with the second circular through hole, and the second bolt 5-2 passes through the second nut 5-3 from top to bottom and passes out of the second circular through hole after being in threaded connection with the second nut 5-3;

the third fine adjustment device 6 comprises a limiting block 6-1, a double-end screw rod 6-2, a third nut 6-3, a fourth nut 6-4, an upper washer 6-5, a lower washer 6-6 and a spring 6-7, wherein the right side of the second nut 5-3 is provided with a mounting groove by the mounting seat 5-1, the bottom of the limiting block 6-1 is fixed in the mounting groove, the middle of the top of the mounting groove is provided with a reverse truncated cone-shaped groove, the bottom of the reverse truncated cone-shaped groove is coaxially provided with a fourth circular through hole, the fourth circular through hole is coaxial with the third circular through hole, the third nut 6-3 is in threaded connection with the upper section of the double-end screw rod 6-2, the fourth nut 6-4 is fixed on the top surface of the valve plate 8 and is coaxial with the fourth circular through hole, the lower section of the double-headed screw 6-2 sequentially passes through the fourth circular through hole and the third circular through hole from top to bottom and then is in threaded connection with the fourth nut 6-4, the upper washer 6-5 and the lower washer 6-6 are sleeved on the part of the double-headed screw 6-2 between the third nut 6-3 and the limiting block 6-1, the lower washer 6-6 is positioned below the upper washer 6-5, the spring 6-7 is sleeved on the part of the double-headed screw 6-2 between the upper washer 6-5 and the lower washer 6-6, the top end and the bottom end respectively lean against the bottom surface of the upper washer 6-5 and the top surface of the lower washer 6-6, the outer diameter of the lower gasket 6-6 is larger than the top diameter of the inverted circular truncated cone-shaped groove, and the diameter of the double-headed screw 6-2 is smaller than the inner diameters of the fourth circular through hole and the third circular through hole.

Further, including sealed lid 18, circular recess has been seted up in the right side wall outside of bearing mounting box 14, coaxial installation manhole of having seted up in the circular recess, sealed lid 18 is the step shaft form and from left to right includes left axle section, the diameter is greater than left axle section diameter and is greater than the right axle section of circular recess internal diameter in proper order, left axle section stretches into in the circular recess, right axle section with the right side wall of bearing mounting box 14 passes through the screw connection.

The beneficial effects of the utility model are as follows:

(1) According to the utility model, the vertical section of the valve body is set to be rectangular, the pentagon is obtained after the upper right corner is removed, the square-like valve body is formed, the whole valve is compact in structure and small in occupied space, meanwhile, a medium inflow hole is formed in the left side of the valve body, a medium outflow hole is formed in the bottom of the valve body, the right vertical side wall is communicated with a bearing mounting box, a cylinder is arranged outside an inclined plane of the upper right corner, a cylinder hinge connecting rod and a connecting rod are fixedly connected with a rotating shaft which is rotatably arranged in the bearing mounting box and extends out, a valve rod fixedly connected with the rotating shaft and a valve rod are arranged in the valve body through a pin shaft, and the linear motion of the cylinder can be skillfully converted into the rotation of the connecting rod, the rotating shaft and the valve rod around the axis of the rotating shaft, so that the valve rod directly drives the valve plate to rotate to open and close the valve plate, the large conductance is realized, the sealing performance of the valve is improved, and the valve is simple in structure, convenient to operate, durable and low in manufacturing cost.

(2) According to the utility model, through designing the included angle between the axis of the valve rod and the axis of the medium inflow hole to be 40-50 degrees, especially 45 degrees when the cylinder piston is positioned at the bottom dead center, when the valve is opened, namely the valve plate rotates to the upper part, larger spaces are reserved between the medium inflow hole, the medium outflow hole and the valve plate, so that the conductance is further improved, and the valve is matched with vacuum obtaining equipment, so that in a high vacuum state, the higher vacuum degree is reached, the internal gas of the equipment is in a molecular flow collision state, and the structural arrangement of the valve plate can reduce the flow resistance and increase the evacuation speed.

(3) According to the valve, the sealing groove is formed in the inner wall of the bottom of the valve body, the sealing ring is arranged in the sealing groove, or the sealing groove is formed in the bottom surface of the valve plate, and the sealing ring is arranged in the sealing groove, so that the sealing performance of the valve can be further improved.

(4) According to the utility model, the valve plate is connected with the valve rod through the pin shaft, so that the valve plate can rotate around the pin shaft under the condition that the sealing is affected due to the fact that the valve plate cannot be attached to the inner wall of the valve body due to manufacturing errors and the like when the valve is closed, the attaching degree between the valve plate and the valve body is automatically adjusted, and the sealing performance of the valve is further improved. Meanwhile, fine adjustment devices are arranged on two sides of the pin shaft, which are connected with the valve plate, on the valve rod, so that the valve plate can be limited around the rotation of the pin shaft, the valve plate is prevented from excessively rotating to influence the sealing performance when the valve is closed, and the sealing performance of the valve is further improved.

(5) According to the utility model, the mounting overhaul hole is formed on the right side of the bearing mounting box, and the sealing cover is arranged, so that the mounting, overhaul and replacement of the internal elements of the valve body can be facilitated on the premise of not affecting the sealing performance of the valve.

Drawings

Fig. 1 is a partial sectional view of the rotary plate valve of the present utility model in the middle position of the rotary shaft in the first embodiment.

Fig. 2 is a partial sectional view of the rotary plate valve of the present utility model in the middle position of the rotary shaft in the first embodiment.

Fig. 3 is a partial enlarged view of the rotary plate valve of the present utility model at the seal groove when the rotary plate valve is closed in the first embodiment.

Fig. 4 is an enlarged view of a portion of the first trim apparatus of fig. 1.

Fig. 5 is an enlarged view of a portion of the second and third trimmings of fig. 1.

In the figure, 1-valve body, 2-cylinder, 3-first trimming device, 3-1-first bolt, 3-2-first nut, 4-pin, 5-second trimming device, 5-1-trimming device mount pad, 5-2-second bolt, 5-3-second nut, 6-third trimming device, 6-1-stopper, 6-2-double-ended screw, 6-3-third nut, 6-4-fourth nut, 6-5-upper gasket, 6-lower gasket, 6-7-spring, 7-valve rod, 8-valve plate, 9-connecting rod, 10-spindle, 11-cylinder mount pad, 12-medium inflow hole, 13-medium outflow hole, 14-bearing mount pad, 15-bearing, 16-valve plate mount pad, 17-mount pad, 18-sealing cover, 19-annular sealing groove, 20-sealing ring.

Detailed Description

The utility model will be further described with reference to the drawings and detailed description.

What needs to be specifically stated is: the terms "upper," "lower," "left," "right," "top," "bottom," and "bottom" are used herein with reference to the orientation of FIG. 1 for convenience of description and to simplify the description, but do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model.

As shown in fig. 1, the rotary plate valve of the utility model comprises a valve body 1, wherein the vertical section of the valve body 1 is a pentagon which is obtained by removing the upper right corner of a rectangle, a medium inflow hole 12 is formed in the left side wall of the valve body 1, a medium outflow hole 13 is formed in the bottom of the valve body, a cylinder 2 is fixed on the outer wall of the upper right corner inclined surface, a bearing mounting box 14 is communicated with the right vertical side wall, a piston rod of the cylinder 2 is parallel to the outer wall of the upper right corner inclined surface and is arranged downwards to the right, a connecting rod 9 is hinged at the tail end of the piston rod, and the connecting rod 9 is positioned behind the bearing mounting box 14;

In the first embodiment, the cylinder mounting seat 11 is fixed on the outer wall of the inclined surface of the right upper corner of the valve body 1, and the rodless side end cover of the cylinder 2 is fixedly connected with the mounting seat 11.

According to the utility model, the vertical section of the valve body 1 is set to be rectangular, the pentagon is obtained after the upper right corner is removed, the square-like valve body is formed, the whole valve is compact in structure and small in occupied space, meanwhile, the medium inflow hole 12 is formed in the left side of the valve body 1, the medium outflow hole 13 is formed in the bottom of the valve body, the right vertical side wall is communicated with the bearing mounting box 14, the cylinder 2 is arranged outside the inclined surface of the upper right corner, the cylinder 2 is hinged with the connecting rod 9, the connecting rod 9 is fixedly connected with the rotating shaft 10 which is arranged in the bearing mounting box 14 in a rotating way, the valve rod 7 fixedly connected with the rotating shaft 10 is arranged in the valve body 1, and the valve rod 7 is connected with the valve plate 8 through the pin shaft 4, so that the linear motion of the cylinder 2 can be skillfully converted into the rotation of the connecting rod 9, the rotating shaft 10 and the valve rod 7 around the axis of the rotating shaft 10, the valve plate 8 can be directly driven to open and close the valve plate 8, the large conductance is realized, the sealing performance of the valve is improved, the structure is simple, the structure is durable, and the manufacturing cost is low.

Referring to fig. 1 and 2, in the present utility model, the axis of the valve rod 7 is horizontal when the piston of the cylinder 2 is at the top dead center, and an included angle is formed between the axis of the valve rod 7 and the axis of the medium inflow hole 12 when the piston of the cylinder 2 is at the bottom dead center. Wherein the top dead center and the bottom dead center are respectively the closest point and the farthest point of the piston from the rod end in the stroke of the cylinder 2. In the first embodiment of the utility model, the included angle is 40-50 degrees, and the included angle is 45 degrees, so that when the valve is opened, that is, the valve plate 8 rotates to the upper side, larger space is reserved between the medium inflow hole 12, the medium outflow hole 13 and the valve plate 8, and the conductance is further improved, and the valve is matched with vacuum obtaining equipment, in a high vacuum state, to reach higher vacuum degree, the gas in the equipment is in a molecular flow collision state, and the structural arrangement of the valve plate 8 can reduce flow resistance and increase the evacuation speed

The sealing performance of the valve plate 8 to the medium outflow hole 13 can be improved by arranging the sealing ring, and the sealing ring is provided with various forms. In the first embodiment, referring to fig. 3, an annular sealing groove 19 (not shown in fig. 1 and 2) coaxial with the medium outflow hole 13 is provided on the bottom inner wall of the valve body 1, the inner ring diameter of the annular sealing groove 19 is larger than the inner diameter of the medium outflow hole 13, the diameter of the valve plate 8 is larger than the outer ring diameter of the annular sealing groove 19, and a sealing ring 20 (not shown in fig. 1 and 2) is provided in the annular sealing groove 19. In a second embodiment of the present utility model, an annular sealing groove coaxial with the valve plate 8 is provided on the bottom surface of the valve plate 8, and a sealing ring is provided in the annular sealing groove.

In the first embodiment, the head and tail of the rotating shaft 10 are circular shaft sections, the middle of the rotating shaft is a square shaft section, the valve rod 7 is a square shaft, and the end face of the head end of the valve rod 7 is connected with the side wall of the square shaft section of the rotating shaft 10 through a key.

According to the utility model, the valve plate 8 is connected with the valve rod 7 through the pin shaft 4, so that under the condition that the valve plate 8 cannot be adhered to the inner wall of the valve body 1 to influence sealing due to manufacturing errors and other reasons when the valve is closed, the valve plate 8 can rotate around the pin shaft 4, the degree of adhesion between the valve plate 8 and the valve body 1 is automatically adjusted, and the sealing performance of the valve is further improved. However, if the rotation of the valve plate 8 around the pin 4 is not limited, the sealing performance may be affected excessively, so in the first embodiment, the valve rod 7 is provided with a first fine adjustment device 3 at the tail, a second fine adjustment device 5 between the head end and the pin 4, and a third fine adjustment device 6 between the head end and the second fine adjustment device 5; the first fine tuning device 3, the second fine tuning device 5 and the third fine tuning device 6 are used for limiting the rotation of the valve plate 8 around the pin shaft 4, preventing the valve plate from excessively rotating to influence the sealing performance when the valve is closed, and further improving the sealing performance of the valve.

In the first embodiment, referring to fig. 4, the first fine adjustment device 3 includes a first bolt 3-1 and a first nut 3-2, a first circular through hole with an axis perpendicular to the valve rod 7 is provided at the tail of the valve rod 7, the first nut 3-2 is fixed at the bottom of the valve rod 7 and is coaxial with the first circular through hole, the tail of the first bolt 3-1 passes through the first circular through hole from top to bottom, then is in threaded connection with the first nut 3-2, and the tail extends out of the first nut 3-2. Wherein a portion may be cut out above the tail of the valve stem 7, such that the thickness of the tail is advantageous for mounting the first bolt 3-1.

Referring to fig. 5, the second fine tuning device 5 includes a fine tuning device mounting seat 5-1, a second bolt 5-2, and a second nut 5-3, the fine tuning device mounting seat 5-1 is horizontally disposed, the rear end of the top surface is fixedly connected with the bottom surface of the valve rod 7, the front end is located below the front side of the valve rod 7, a second circular through hole is provided in the fine tuning device mounting seat 5-1, the second nut 5-3 is fixed at the top of the fine tuning device mounting seat 5-1 and is coaxial with the second circular through hole, and the second bolt 5-2 passes through the second nut 5-3 from top to bottom and passes out of the second circular through hole after being in threaded connection with the second nut 5-3.

Referring to fig. 5, the third fine adjustment device 6 comprises a limiting block 6-1, a double-end screw rod 6-2, a third nut 6-3, a fourth nut 6-4, an upper washer 6-5, a lower washer 6-6 and a spring 6-7, wherein the right side of the second nut 5-3 is provided with a mounting groove by the mounting seat 5-1, the bottom of the limiting block 6-1 is fixed in the mounting groove, the middle of the top of the limiting block is provided with a reverse circular truncated cone-shaped groove, the bottom of the reverse circular truncated cone-shaped groove is coaxially provided with a fourth circular through hole, the fourth circular through hole is coaxial with the third circular through hole, the third nut 6-3 is in threaded connection with the upper section of the double-end screw rod 6-2, the fourth nut 6-4 is fixed on the top surface of the valve plate 8 and is coaxial with the fourth circular through hole, the lower section of the double-headed screw 6-2 sequentially passes through the fourth circular through hole and the third circular through hole from top to bottom and then is in threaded connection with the fourth nut 6-4, the upper washer 6-5 and the lower washer 6-6 are sleeved on the part of the double-headed screw 6-2 between the third nut 6-3 and the limiting block 6-1, the lower washer 6-6 is positioned below the upper washer 6-5, the spring 6-7 is sleeved on the part of the double-headed screw 6-2 between the upper washer 6-5 and the lower washer 6-6, the top end and the bottom end respectively lean against the bottom surface of the upper washer 6-5 and the top surface of the lower washer 6-6, the outer diameter of the lower gasket 6-6 is larger than the top diameter of the inverted circular truncated cone-shaped groove, and the diameter of the double-headed screw 6-2 is smaller than the inner diameters of the fourth circular through hole and the third circular through hole.

In order to facilitate the installation of the valve rod 7, the valve plate 8, the rotating shaft 10, various fine tuning devices and other internal elements into the valve body 1 and the maintenance and replacement of the internal elements of the valve when the valve is manufactured, the utility model also provides a circular groove on the outer side of the right side wall of the bearing mounting box 14, a mounting overhaul hole is coaxially arranged in the circular groove, meanwhile, a sealing cover 18 is arranged, the sealing cover 18 is in a stepped shaft form and comprises a left shaft section and a right shaft section with the diameter larger than that of the left shaft section and larger than that of the circular groove from left to right, the left shaft section stretches into the circular groove, and the right shaft section is connected with the right side wall of the bearing mounting box 14 through a screw.

It should be apparent that the above-described embodiments are merely some, but not all, embodiments of the present utility model. The above examples are only for explaining the present utility model and do not limit the scope of the present utility model. Based on the above embodiments, all other embodiments, i.e. all modifications, equivalents and improvements made within the spirit and principles of the present application, which are obtained by persons skilled in the art without making creative efforts are within the scope of the present utility model claimed.

Claims

1. The rotary plate valve is characterized by comprising a valve body (1), wherein the vertical section of the valve body (1) is a pentagon which is obtained by removing an upper right corner, a medium inflow hole (12) is formed in the left side wall of the valve body (1), a medium outflow hole (13) is formed in the bottom of the valve body, an air cylinder (2) is fixed on the outer wall of an upper right corner inclined surface, a bearing mounting box (14) is communicated with the right vertical side wall, a piston rod of the air cylinder (2) is parallel to the outer wall of the upper right corner inclined surface and is arranged downwards towards the right, a connecting rod (9) is hinged to the tail end of the piston rod, and the connecting rod (9) is positioned behind the bearing mounting box (14);

bearings (15) are fixed on the front side and the rear side of the inside of the bearing mounting box (14), the two bearings (15) are coaxial, the axis is perpendicular to the connecting rod (9), a rotating shaft (10) is arranged in the bearing mounting box (14), the head part and the tail part of the rotating shaft (10) are respectively connected with the bearings (15) on the rear side and the front side, and the head end of the rotating shaft (10) penetrates out of the rear side wall of the bearing mounting box (14) backwards and is fixedly connected with one end, far away from the air cylinder (2), of the connecting rod (9);

a valve rod (7) and a circular valve plate (8) are arranged in the valve body (1), the valve rod (7) is perpendicular to the rotating shaft (10) and the head end is fixedly connected with the middle part of the rotating shaft (10), a valve plate mounting seat (16) is fixed in the middle of the top surface of the valve plate (8), two mounting plates (17) which are parallel to each other are arranged at the top of the valve plate mounting seat (16), and the two mounting plates (17) are respectively positioned at the front side and the rear side of the valve rod (7) and are rotationally connected with the valve rod (7) through a pin shaft (4); the diameter of the valve plate (8) is larger than the inner diameter of the medium outflow hole (13).

2. A rotor valve according to claim 1, characterized in that the axis of the valve stem (7) is horizontal when the piston of the cylinder (2) is at top dead centre and the axis of the valve stem (7) forms an angle with the axis of the medium inflow hole (12) when the piston of the cylinder (2) is at bottom dead centre.

3. The flapper valve of claim 2 wherein the included angle is 40-50 degrees.

4. A flapper valve as claimed in claim 3 wherein the included angle is 45 degrees.

5. The rotary plate valve according to claim 1, characterized in that an annular sealing groove (19) coaxial with the medium outflow hole (13) is formed in the inner wall of the bottom of the valve body (1), the inner ring diameter of the annular sealing groove (19) is larger than the inner diameter of the medium outflow hole (13), the diameter of the valve plate (8) is larger than the outer ring diameter of the annular sealing groove (19), and a sealing ring (20) is arranged in the annular sealing groove (19).

6. The rotary plate valve according to claim 1, characterized in that an annular sealing groove coaxial with the valve plate (8) is formed in the bottom surface of the valve plate (8), and a sealing ring is arranged in the annular sealing groove.

7. The rotary plate valve according to claim 1, wherein the head part and the tail part of the rotating shaft (10) are round shaft sections, the middle part of the rotating shaft is a square shaft section, the valve rod (7) is a square shaft, and the head end face of the valve rod (7) is connected with the side wall of the square shaft section of the rotating shaft (10) through a key.

8. The rotary valve according to claim 7, characterized in that the valve rod (7) is provided with a first trimming device (3) at the tail, a second trimming device (5) between the head end and the pin (4), and a third trimming device (6) between the head end and the second trimming device (5); the first fine tuning device (3), the second fine tuning device (5) and the third fine tuning device (6) are used for limiting the rotation of the valve plate (8) around the pin shaft (4).

9. The rotary plate valve according to claim 8, wherein the first fine adjustment device (3) comprises a first bolt (3-1) and a first nut (3-2), a first circular through hole with an axis perpendicular to the valve rod (7) is formed in the tail of the valve rod (7), the first nut (3-2) is fixed at the bottom of the valve rod (7) and is coaxial with the first circular through hole, the tail of the first bolt (3-1) passes through the first circular through hole from top to bottom and then is in threaded connection with the first nut (3-2), and the tail end of the first bolt extends out of the first nut (3-2); the second fine adjustment device (5) comprises a fine adjustment device mounting seat (5-1), a second bolt (5-2) and a second nut (5-3), wherein the fine adjustment device mounting seat (5-1) is horizontally arranged, the rear end of the top surface of the fine adjustment device mounting seat is fixedly connected with the bottom surface of the valve rod (7), the front end of the fine adjustment device mounting seat is positioned below the front side of the valve rod (7), a second circular through hole is formed in the fine adjustment device mounting seat (5-1), the second nut (5-3) is fixed on the top of the fine adjustment device mounting seat (5-1) and is coaxial with the second circular through hole, and the second bolt (5-2) penetrates through the second nut (5-3) from top to bottom and penetrates out of the second circular through hole after being in threaded connection with the second nut (5-3);

the third fine adjustment device (6) comprises a limiting block (6-1), a double-head screw (6-2), a third nut (6-3), a fourth nut (6-4), an upper gasket (6-5), a lower gasket (6-6) and a spring (6-7), wherein the mounting seat (5-1) of the fine adjustment device is provided with a mounting groove on the right side of the second nut (5-3), the mounting groove is provided with a third circular through hole on the bottom, the bottom of the limiting block (6-1) is fixed in the mounting groove, the middle of the top is provided with an inverted circular groove, the bottom of the inverted circular groove is coaxially provided with a fourth circular through hole, the fourth circular through hole is coaxial with the third circular through hole, the third nut (6-3) is in threaded connection with the upper section of the double-head screw (6-2), the lower section of the fourth nut (6-4) is fixed on the top surface of the valve plate (8) and is sequentially penetrated through the fourth circular through hole from top to bottom, the fourth circular through hole is coaxially connected with the fourth nut (6-3) and the fourth circular through hole is coaxially arranged between the double-head screw (6-2) and the double-head screw (6-3), the lower gasket (6-6) is located below the upper gasket (6-5), the spring (6-7) is sleeved on the part, located between the upper gasket (6-5) and the lower gasket (6-6), of the double-headed screw (6-2), the top end and the bottom end of the spring are respectively abutted against the bottom surface of the upper gasket (6-5) and the top surface of the lower gasket (6-6), the outer diameter of the lower gasket (6-6) is larger than the top diameter of the inverted circular truncated cone-shaped groove, and the diameter of the double-headed screw (6-2) is smaller than the inner diameters of the fourth circular through hole and the third circular through hole.

10. The rotary plate valve according to claim 1, comprising a sealing cover (18), wherein a circular groove is formed in the outer side of the right side wall of the bearing mounting box (14), a mounting manhole is coaxially formed in the circular groove, the sealing cover (18) is in a stepped shaft form and sequentially comprises a left shaft section, a right shaft section with the diameter larger than that of the left shaft section and larger than the inner diameter of the circular groove from left to right, the left shaft section stretches into the circular groove, and the right shaft section is connected with the right side wall of the bearing mounting box (14) through a screw.