阅读说明：本技术 一种球阀 (Ball valve ) 是由 冯利敏 张振国 李长东 于 2021-02-24 设计创作，主要内容包括：本发明公开了一种球阀,包括阀体,所述阀体内设有下端开口的阀腔,所述阀体的左侧设有左阀孔、右侧设有与左阀孔同轴的右阀孔,所述阀体在阀腔的下端固定设有下阀盖；所述阀体内设有转动连接有阀杆,所述阀杆的下端位于阀腔内且固定设有转动连接在下阀盖上的阀球,所述左阀孔内固定设有左阀套,所述右阀孔内固定设有右阀套,所述阀球用于控制左阀套和右阀套连通或断开,所述左阀套的右端设有与阀球接触的左密封圈,所述右阀套的左端设有与阀球接触的右密封圈；所述阀球内设有连通孔,所述阀球在连通孔的两端设有阀瓣组件,所述阀瓣组件用于控制连通孔的通断,所述阀杆内设有驱动组件；该球阀不仅结构简单,而且能够有效延长密封圈的使用寿命。(The invention discloses a ball valve, which comprises a valve body, wherein a valve cavity with an opening at the lower end is arranged in the valve body, a left valve hole is formed in the left side of the valve body, a right valve hole coaxial with the left valve hole is formed in the right side of the valve body, and a lower valve cover is fixedly arranged at the lower end of the valve cavity of the valve body; the valve comprises a valve body, a valve rod, a valve ball, a left valve sleeve, a right valve sleeve, a left sealing ring, a right sealing ring and a right sealing ring, wherein the valve rod is rotatably connected in the valve body, the lower end of the valve rod is positioned in a valve cavity and is fixedly provided with the valve ball rotatably connected to a lower valve cover; the valve ball is internally provided with a communication hole, the two ends of the communication hole of the valve ball are provided with valve clack assemblies, the valve clack assemblies are used for controlling the connection and disconnection of the communication hole, and a driving assembly is arranged in the valve rod; the ball valve is simple in structure and can effectively prolong the service life of the sealing ring.)

1. A ball valve comprises a valve body, wherein a valve cavity with an opening at the lower end is arranged in the valve body, a left valve hole is formed in the left side of the valve body, a right valve hole coaxial with the left valve hole is formed in the right side of the valve body, and a lower valve cover is fixedly arranged at the lower end of the valve cavity of the valve body; the valve is characterized in that a valve rod is rotatably connected in the valve body, the lower end of the valve rod is positioned in the valve cavity and is fixedly provided with a valve ball rotatably connected to a lower valve cover, a left valve sleeve is fixedly arranged in the left valve hole, a right valve sleeve is fixedly arranged in the right valve hole, the valve ball is used for controlling the connection or disconnection of the left valve sleeve and the right valve sleeve, a left sealing ring in contact with the valve ball is arranged at the right end of the left valve sleeve, and a right sealing ring in contact with the valve ball is arranged at the left end of the right valve sleeve; the ball valve is characterized in that a communication hole is formed in the valve ball, valve clack assemblies are arranged at two ends of the communication hole of the valve ball and used for controlling the connection and disconnection of the communication hole, a driving assembly is arranged in the valve rod, when the ball valve is opened from closing, the valve rod is controlled to drive the valve ball to rotate to a position where the communication hole and a left valve hole are coaxial, and then the valve clack assemblies are controlled to open the communication hole through the driving assembly; when the ball valve is opened to be closed, the valve clack assembly is controlled to close the communicating hole through the driving assembly, and then the valve rod is controlled to drive the valve ball to rotate to the position where the communicating hole is perpendicular to the left valve hole.

2. The ball valve according to claim 1, wherein the valve flap assembly comprises a left upper valve flap, a left lower valve flap, a right upper valve flap and a right lower valve flap, a left arc-shaped chute and a right arc-shaped chute are symmetrically arranged on the spherical surface of the valve ball by taking the valve rod as a center, the left arc-shaped chute is communicated with the left end of the communication hole, and the right arc-shaped chute is communicated with the right end of the communication hole; the two side surfaces of the left arc-shaped sliding chute are symmetrically provided with a left sliding chute, and the two side surfaces of the right arc-shaped sliding chute are symmetrically provided with a right sliding chute; the left upper valve clack is connected in the left arc-shaped sliding chute in a sliding manner and is positioned above the communicating hole, and left upper convex plates positioned in the left sliding chute are arranged on two sides of the left upper valve clack; the left lower valve clack is connected in the left arc-shaped sliding chute in a sliding manner and is positioned below the communicating hole, and left lower convex plates positioned in the left sliding chute are arranged on two sides of the left lower valve clack; the right upper valve clack is connected in the right arc-shaped sliding groove in a sliding manner and is positioned above the communication hole, and right upper convex plates positioned in the right sliding groove are arranged on two sides of the right upper valve clack; the right lower valve clack is connected in the right arc-shaped sliding chute in a sliding manner and is positioned below the communicating hole, and right lower convex plates positioned in the right sliding chute are arranged on two sides of the right lower valve clack; when the communication hole is closed, the upper left valve clack and the lower left valve clack move oppositely and are closed, the upper right valve clack and the lower right valve clack move oppositely and are closed, when the communication hole is opened, the upper left valve clack and the lower left valve clack move back to back and are separated, and the upper right valve clack and the lower right valve clack move back to back and are separated.

3. The ball valve according to claim 2, wherein the driving assembly comprises a shaft rod, an upper mounting groove is arranged above the communication hole in the valve ball, a lower mounting groove is arranged below the communication hole, the left ends of the upper mounting groove and the lower mounting groove are both communicated with the left arc-shaped sliding groove, and the right ends of the upper mounting groove and the lower mounting groove are both communicated with the right arc-shaped sliding groove; the shaft lever is rotatably connected in the valve rod, the lower end of the shaft lever penetrates through the upper mounting groove and the lower mounting groove, an upper worm is fixedly arranged on the side surface of the shaft lever positioned in the upper mounting groove, and a lower worm is fixedly arranged on the side surface of the shaft lever positioned in the lower mounting groove; the left side of the upper worm in the upper mounting groove is rotatably connected with an upper left worm wheel meshed with the upper worm, and the right side of the upper worm is rotatably connected with an upper right worm wheel meshed with the upper worm; the end surface of the left upper worm wheel is coaxially and fixedly provided with a left gear, and the end surface of the right upper worm wheel is coaxially and fixedly provided with a right gear; the upper mounting groove is rotatably connected with a left upper gear meshed with the left gear and a right upper gear meshed with the right gear, the inner side surface of the left upper valve clack is provided with a left upper rack meshed with the left upper gear, and the inner side surface of the right upper valve clack is provided with a right upper rack meshed with the right upper gear;

a left lower worm wheel meshed with the lower worm is rotatably connected to the left side of the lower worm in the lower mounting groove, and a right lower worm wheel meshed with the lower worm is rotatably connected to the right side of the lower worm; the end surface of the left lower worm wheel is coaxially and fixedly provided with a left second gear, and the end surface of the right lower worm wheel is coaxially and fixedly provided with a right second gear; the lower mounting groove is rotatably connected with a left lower gear meshed with the left second gear and a right lower gear meshed with the right second gear, a left lower rack meshed with the left lower gear is arranged on the inner side surface of the left lower valve clack, and a right lower rack meshed with the right lower gear is arranged on the inner side surface of the right lower valve clack.

4. A ball valve according to claim 2, wherein a handle is fixedly provided at the upper end of the valve stem.

5. The ball valve according to claim 4, wherein a rotary table is fixedly arranged at the upper end of the shaft rod, a positioning assembly matched with the handle is arranged on the rotary table, the positioning assembly comprises a positioning rod, a mounting groove is formed in the rotary table, a positioning groove is formed in the upper surface of the handle, the positioning rod penetrates through the mounting groove along the axial direction of the rotary table, a convex shoulder is arranged on the side face of the mounting groove, a positioning spring for forcing the positioning rod to press towards the handle is arranged between the convex shoulder and the top of the mounting groove in the mounting groove, and a ball body is arranged at the upper end of the positioning rod, which extends out; when the valve clack assembly opens or closes the communicating hole, the lower end of the positioning rod extends into the positioning groove.

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a ball valve.

Background

The ball valve is a valve in which an opening and closing part (a ball body) is driven by a valve rod and rotates around the axis of the ball valve. With the rapid development of science and technology, the continuous improvement of production process and product structure has rapidly developed into a main valve class. The ball valve has the advantages of small fluid resistance, simple structure, tightness, reliability, convenient operation, rapid opening and closing, wide application range and the like, is widely applied to industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmacy, water conservancy, electric power, municipal administration, steel and the like, and plays a very important role in national economy. When the ball body of the existing ball valve is just opened and is quickly and completely closed, because the opening area of the flow channel is small at the moment, the internal high-pressure medium can cause great impact on the sealing element, the valve seat is easy to damage, the valve is leaked, and the service life is influenced.

Disclosure of Invention

The invention aims to provide a ball valve which is simple in structure and can effectively prolong the service life of a sealing ring.

In order to achieve the purpose, the invention provides the following technical scheme: a ball valve comprises a valve body, wherein a valve cavity with an opening at the lower end is arranged in the valve body, a left valve hole is formed in the left side of the valve body, a right valve hole coaxial with the left valve hole is formed in the right side of the valve body, and a lower valve cover is fixedly arranged at the lower end of the valve cavity of the valve body; the valve comprises a valve body, a valve rod, a valve ball, a left valve sleeve, a right valve sleeve, a left sealing ring, a right sealing ring and a right sealing ring, wherein the valve rod is rotatably connected in the valve body, the lower end of the valve rod is positioned in a valve cavity and is fixedly provided with the valve ball rotatably connected to a lower valve cover; the ball valve is characterized in that a communication hole is formed in the valve ball, valve clack assemblies are arranged at two ends of the communication hole of the valve ball and used for controlling the connection and disconnection of the communication hole, a driving assembly is arranged in the valve rod, when the ball valve is opened from closing, the valve rod is controlled to drive the valve ball to rotate to a position where the communication hole and a left valve hole are coaxial, and then the valve clack assemblies are controlled to open the communication hole through the driving assembly; when the ball valve is opened to be closed, the valve clack assembly is controlled to close the communicating hole through the driving assembly, and then the valve rod is controlled to drive the valve ball to rotate to the position where the communicating hole is perpendicular to the left valve hole.

Further, the valve clack assembly comprises a left upper valve clack, a left lower valve clack, a right upper valve clack and a right lower valve clack, a left arc-shaped sliding groove and a right arc-shaped sliding groove are symmetrically arranged on the spherical surface of the valve ball by taking the valve rod as a center, the left arc-shaped sliding groove is communicated with the left end of the communicating hole, and the right arc-shaped sliding groove is communicated with the right end of the communicating hole; the two side surfaces of the left arc-shaped sliding chute are symmetrically provided with a left sliding chute, and the two side surfaces of the right arc-shaped sliding chute are symmetrically provided with a right sliding chute; the left upper valve clack is connected in the left arc-shaped sliding chute in a sliding manner and is positioned above the communicating hole, and left upper convex plates positioned in the left sliding chute are arranged on two sides of the left upper valve clack; the left lower valve clack is connected in the left arc-shaped sliding chute in a sliding manner and is positioned below the communicating hole, and left lower convex plates positioned in the left sliding chute are arranged on two sides of the left lower valve clack; the right upper valve clack is connected in the right arc-shaped sliding groove in a sliding manner and is positioned above the communication hole, and right upper convex plates positioned in the right sliding groove are arranged on two sides of the right upper valve clack; the right lower valve clack is connected in the right arc-shaped sliding chute in a sliding manner and is positioned below the communicating hole, and right lower convex plates positioned in the right sliding chute are arranged on two sides of the right lower valve clack; when the communication hole is closed, the upper left valve clack and the lower left valve clack move oppositely and are closed, the upper right valve clack and the lower right valve clack move oppositely and are closed, when the communication hole is opened, the upper left valve clack and the lower left valve clack move back to back and are separated, and the upper right valve clack and the lower right valve clack move back to back and are separated.

Further, the driving assembly comprises a shaft rod, an upper mounting groove is formed in the valve ball above the communication hole, a lower mounting groove is formed in the valve ball below the communication hole, the left ends of the upper mounting groove and the lower mounting groove are communicated with the left arc-shaped sliding groove, and the right ends of the upper mounting groove and the lower mounting groove are communicated with the right arc-shaped sliding groove; the shaft lever is rotatably connected in the valve rod, the lower end of the shaft lever penetrates through the upper mounting groove and the lower mounting groove, an upper worm is fixedly arranged on the side surface of the shaft lever positioned in the upper mounting groove, and a lower worm is fixedly arranged on the side surface of the shaft lever positioned in the lower mounting groove; the left side of the upper worm in the upper mounting groove is rotatably connected with an upper left worm wheel meshed with the upper worm, and the right side of the upper worm is rotatably connected with an upper right worm wheel meshed with the upper worm; the end surface of the left upper worm wheel is coaxially and fixedly provided with a left gear, and the end surface of the right upper worm wheel is coaxially and fixedly provided with a right gear; the upper mounting groove is rotatably connected with a left upper gear meshed with the left gear and a right upper gear meshed with the right gear, the inner side surface of the left upper valve clack is provided with a left upper rack meshed with the left upper gear, and the inner side surface of the right upper valve clack is provided with a right upper rack meshed with the right upper gear;

a left lower worm wheel meshed with the lower worm is rotatably connected to the left side of the lower worm in the lower mounting groove, and a right lower worm wheel meshed with the lower worm is rotatably connected to the right side of the lower worm; the end surface of the left lower worm wheel is coaxially and fixedly provided with a left second gear, and the end surface of the right lower worm wheel is coaxially and fixedly provided with a right second gear; the lower mounting groove is rotatably connected with a left lower gear meshed with the left second gear and a right lower gear meshed with the right second gear, a left lower rack meshed with the left lower gear is arranged on the inner side surface of the left lower valve clack, and a right lower rack meshed with the right lower gear is arranged on the inner side surface of the right lower valve clack.

Further, a handle is fixedly arranged at the upper end of the valve rod.

Furthermore, a turntable is fixedly arranged at the upper end of the shaft rod, a positioning assembly matched with the handle is arranged on the turntable, the positioning assembly comprises a positioning rod, a mounting groove is formed in the turntable, a positioning groove is formed in the upper surface of the handle, the positioning rod penetrates through the mounting groove along the axial direction of the turntable, a convex shoulder is arranged on the side face of the mounting groove, a positioning spring used for forcing the positioning rod to press the handle is arranged between the convex shoulder and the top of the mounting groove in the mounting groove, and a ball body is arranged at the upper end of the positioning rod, which extends out of; when the valve clack assembly opens or closes the communicating hole, the lower end of the positioning rod extends into the positioning groove.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. the valve clack assembly is used for covering the communication hole, so that the valve ball is complete, and the left sealing ring and the right sealing ring are always attached to the valve ball and cannot be washed away in the opening and closing processes of the ball valve, so that the left sealing ring and the right sealing ring are protected, and the service life of the ball valve is prolonged;

2. through using the upper left valve clack, the lower left valve clack, the upper right valve clack and the lower right valve clack which have the same cambered surface with the surface of the valve ball, the valve clacks open or close the communication hole in a sliding mode, the form is convenient, and the operation is simple

3. Through using worm wheel and last worm, worm wheel and worm transmission control down, through the cooperation of upper left valve clack, lower left valve clack and left arc spout to and the cooperation of upper right valve clack, lower right valve clack and right arc spout, make upper left valve clack, lower left valve clack, upper right valve clack, lower right valve clack slide in the valve ball outside, change spheroid form, simple structure.

Drawings

FIG. 1 is a cross-sectional view of the ball valve of the present invention as it is opened;

FIG. 2 is a cross-sectional view of the ball valve flap assembly of the present invention with the communication aperture closed;

FIG. 3 is a block diagram of the valve ball when the flapper assembly of the present invention is fully open the communication aperture;

FIG. 4 is a block diagram of the valve ball with the flapper assembly partially opening the communication aperture in accordance with the present invention;

fig. 5 is a structural view of the valve ball when the valve flap assembly of the present invention completely closes the communication hole.

Detailed Description

Referring to fig. 1-5, a ball valve includes a valve body 3, a valve cavity 31 with an open lower end is provided in the valve body 3, a left valve hole 32 is provided on the left side of the valve body 3, a right valve hole 33 coaxial with the left valve hole 32 is provided on the right side of the valve body 3, and a lower valve cover 34 is fixedly provided on the lower end of the valve cavity 31 of the valve body 3; a valve rod 4 is rotatably connected in the valve body 3, the lower end of the valve rod 4 is positioned in the valve cavity 31 and is fixedly provided with a valve ball 2 rotatably connected to the lower valve cover 34, a left valve sleeve 8a is fixedly arranged in the left valve hole 32, a right valve sleeve 8b is fixedly arranged in the right valve hole 33, the valve ball 2 is used for controlling the connection or disconnection of the left valve sleeve 8a and the right valve sleeve 8b, a left sealing ring 8a1 in contact with the valve ball 2 is arranged at the right end of the left valve sleeve 8a, and a right sealing ring 8b1 in contact with the valve ball 2 is arranged at the left end of the right valve sleeve 8 b; the valve ball 2 is internally provided with a communication hole 2c, the two ends of the communication hole 2c of the valve ball 2 are provided with valve clack assemblies, the valve clack assemblies are used for controlling the connection and disconnection of the communication hole 2c, the valve rod 4 is internally provided with a driving assembly, when the ball valve is opened from closing, the valve rod 4 is controlled to drive the valve ball 2 to rotate to the position where the communication hole 2c and the left valve hole 32 are coaxial, and then the valve clack assemblies are controlled by the driving assembly to open the communication hole 2 c; when the ball valve is opened to be closed, the valve clack assembly is controlled by the driving assembly to close the communication hole 2c, and then the valve rod 4 is controlled to drive the valve ball 2 to rotate to a position where the communication hole 2c is perpendicular to the left valve hole 32.

The valve clack assembly comprises a left upper valve clack 7a, a left lower valve clack 7c, a right upper valve clack 7b and a right lower valve clack 7d, a left arc-shaped sliding groove 21 and a right arc-shaped sliding groove 22 are symmetrically arranged on the spherical surface of the valve ball 2 by taking the valve rod 4 as a center, the left arc-shaped sliding groove 21 is communicated with the left end of the communicating hole 2c, and the right arc-shaped sliding groove 22 is communicated with the right end of the communicating hole 2 c; two side surfaces of the left arc-shaped sliding groove 21 are symmetrically provided with left sliding grooves 2a, and two side surfaces of the right arc-shaped sliding groove 22 are symmetrically provided with right sliding grooves 2 b; the left upper valve flap 7a is connected in the left arc-shaped sliding groove 21 in a sliding manner and is positioned above the communicating hole 2c, and left upper convex plates (both shown in the drawing) positioned in the left sliding groove 2a are arranged at two sides of the left upper valve flap 7 a; the left lower valve clack 7c is connected in the left arc-shaped sliding groove 21 in a sliding manner and is positioned below the communicating hole 2c, and left lower convex plates (both shown in the figure) positioned in the left sliding groove 2a are arranged on two sides of the left lower valve clack 7 c; the right upper valve flap 7b is connected in a sliding manner in the right arc-shaped sliding groove 22 and is positioned above the communication hole 2c, and right upper convex plates (both shown in the figure) positioned in the right sliding groove 2b are arranged on two sides of the right upper valve flap 7 b; the right lower valve clack 7d is connected in the right arc-shaped sliding groove 22 in a sliding manner and is positioned below the communication hole 2c, and right lower convex plates (both shown in the figure) positioned in the right sliding groove 2b are arranged on two sides of the right lower valve clack 7 d; when the communication hole 2c is closed, the upper left valve flap 7a and the lower left valve flap 7c move toward each other and close, the upper right valve flap 7b and the lower right valve flap 7d move toward each other and close, when the communication hole 2c is open, the upper left valve flap 7a and the lower left valve flap 7c move away from each other and separate, and the upper right valve flap 7b and the lower right valve flap 7d move away from each other and separate.

The driving assembly comprises a shaft rod 1, an upper mounting groove 23 is arranged above the communication hole 2c in the valve ball 2, a lower mounting groove 24 is arranged below the communication hole 2c, the left ends of the upper mounting groove 23 and the lower mounting groove 24 are both communicated with the left arc-shaped sliding groove 21, and the right ends of the upper mounting groove 23 and the lower mounting groove 24 are both communicated with the right arc-shaped sliding groove 22; the shaft lever 1 is rotatably connected in the valve rod 4, the lower end of the shaft lever 1 penetrates through the upper mounting groove 23 and the lower mounting groove 24, an upper worm 1a is fixedly arranged on the side surface of the shaft lever 1 positioned in the upper mounting groove 23, and a lower worm 1b is fixedly arranged on the side surface of the shaft lever positioned in the lower mounting groove 24; a left upper worm wheel 5a meshed with the upper worm 1a is rotatably connected to the left side of the upper worm 1a in the upper mounting groove 23, and a right upper worm wheel 5b meshed with the upper worm 1a is rotatably connected to the right side of the upper worm 1 a; a left gear (not shown in the figures) is coaxially and fixedly arranged on the end surface of the left upper worm wheel 5a, and a right gear (not shown in the figures) is coaxially and fixedly arranged on the end surface of the right upper worm wheel 5 b; the upper mounting groove 23 is rotatably connected with a left upper gear 6a engaged with the left gear and a right upper gear 6b engaged with the right gear, a left upper rack (not shown in the figure) engaged with the left upper gear 6a is arranged on the inner side surface of the left upper valve flap 7a, and a right upper rack (not shown in the figure) engaged with the right upper gear 6b is arranged on the inner side surface of the right upper valve flap 7 b.

A left lower worm wheel 5c meshed with the lower worm 1b is rotatably connected to the left side of the lower worm 1b in the lower mounting groove 24, and a right lower worm wheel 5d meshed with the lower worm 1b is rotatably connected to the right side of the lower worm 1 b; a left second gear (not shown in the figures) is coaxially and fixedly arranged on the end surface of the left lower worm wheel 5c, and a right second gear (not shown in the figures) is coaxially and fixedly arranged on the end surface of the right lower worm wheel 5 d; the lower mounting groove 24 is rotatably connected with a left lower gear 6c engaged with the left second gear and a right lower gear 6d engaged with the right second gear, a left lower rack (not shown in the figure) engaged with the left lower gear 6c is arranged on the inner side surface of the left lower valve clack 7c, and a right lower rack (not shown in the figure) engaged with the right lower gear 6d is arranged on the inner side surface of the right lower valve clack 7 d.

And a handle 9 is fixedly arranged at the upper end of the valve rod 4. A turntable 10 is fixedly arranged at the upper end of the shaft lever 1, a positioning assembly matched with the handle 9 is arranged on the turntable 10, the positioning assembly comprises a positioning rod 12, a mounting groove 10a is arranged in the turntable 10, a positioning groove 9a is arranged on the upper surface of the handle 9, the positioning rod 12 penetrates through the mounting groove 10a along the axial direction of the turntable 10, a convex shoulder 12a is arranged on the side surface of the mounting groove 10a of the positioning rod 12, a positioning spring 11 for forcing the positioning rod 12 to press towards the handle 9 is arranged between the convex shoulder 12a and the top of the mounting groove 10a in the mounting groove 10a, and the upper end of the positioning rod 12 extends out of the turntable 10 and is; when the valve clack assembly opens or closes the communication hole 2c, the lower ends of the positioning rods 12 extend into the positioning grooves 9 a.

When the ball valve is opened from closing, the handle 9 is firstly rotated to enable the valve rod 4 to drive the valve ball 2 to rotate, and the ball valve stops when the handle 9 rotates by 90 degrees (as shown in fig. 2), because the left upper valve flap 7a and the left lower valve flap 7c are contacted to close the left end of the communication hole 2c, the right upper valve flap 7b and the right lower valve flap 7d are contacted to close the right end of the communication hole 2c, a complete spherical surface is formed at the communication hole 2c, and further when the communication hole 2c passes through the left sealing ring 8a1 and the right sealing ring 8b1, the left upper valve flap 7a and the left lower valve flap 7c are directly attached to the left sealing ring 8a1, and the right upper valve flap 7b and the right lower valve flap 7d are always attached to the right sealing ring 8b1, so that the left sealing ring 8a1 and the right sealing ring 8b1 are free. The lower end of a positioning rod 12 is pulled out of a positioning groove 9a by overcoming a positioning spring 11, a rotary table 10 is rotated to drive a shaft rod 1 to rotate, the shaft rod 1 drives an upper worm 1a and a lower worm 1b to synchronously rotate when rotating, the upper worm 1a drives an upper left worm wheel 5a and an upper right worm wheel 5b to synchronously rotate when rotating, the upper left worm wheel 5a drives an upper left valve flap 7a to move upwards along a left arc-shaped sliding groove 21 through a left gear, an upper left gear 6a and an upper left rack, and the upper right worm wheel 5b drives an upper right valve flap 7b to move upwards along a right arc-shaped sliding groove 22 through a right gear, an upper right gear 6b and an upper right rack; meanwhile, when the lower worm 1b rotates, the left lower worm wheel 5c and the right lower worm wheel 5d are driven to synchronously rotate, the left lower worm wheel 5c drives the left lower valve clack 7c to move downwards along the left arc-shaped sliding chute 21 through the left second gear, the left lower gear 6c and the left lower rack, and the right lower worm wheel 5d drives the right lower valve clack 7d to move downwards along the right arc-shaped sliding chute 22 through the right second gear, the right lower gear 6d and the right lower rack; therefore, the rotation of the rotary disk 10 causes the upper left valve flap 7a and the lower left valve flap 7c to move back to open the left end of the communication hole 2c, and causes the upper right valve flap 7b and the lower right valve flap 7d to move back to open the right end of the communication hole 2c (as shown in fig. 1), thereby completing the opening of the ball valve.

When the ball valve is opened to be closed, firstly, a positioning rod 12 is pulled out of a positioning groove 9a by overcoming a positioning spring 11, a rotary table 10 is rotated to drive a shaft lever 1 to rotate, the shaft lever 1 drives an upper worm 1a and a lower worm 1b to synchronously rotate when rotating, the upper worm 1a drives an upper left worm wheel 5a and an upper right worm wheel 5b to synchronously rotate when rotating, the upper left worm wheel 5a drives an upper left valve flap 7a to downwards move along a left arc-shaped chute 21 through a left gear, an upper left gear 6a and an upper left rack, and the upper right worm wheel 5b drives an upper right valve flap 7b to downwards move along a right arc-shaped chute 22 through a right gear, an upper right gear 6b and an upper right rack; meanwhile, when the lower worm 1b rotates, the left lower worm wheel 5c and the right lower worm wheel 5d are driven to synchronously rotate, the left lower worm wheel 5c drives the left lower valve clack 7c to move upwards along the left arc-shaped sliding chute 21 through the left second gear, the left lower gear 6c and the left lower rack, and the right lower worm wheel 5d drives the right lower valve clack 7d to move upwards along the right arc-shaped sliding chute 22 through the right second gear, the right lower gear 6d and the right lower rack; therefore, the rotating disk 10 is rotated to drive the left upper valve flap 7a and the left lower valve flap 7c to move oppositely to close the left end of the communication hole 2c, and simultaneously drive the right upper valve flap 7b and the right lower valve flap 7d to move oppositely to close the right end of the communication hole 2c (as shown in fig. 2), the handle 9 is rotated to drive the valve ball 2 to rotate by the valve rod 4, the handle 9 stops rotating by 90 degrees, because the left upper valve flap 7a and the left lower valve flap 7c contact to close the left end of the communication hole 2c, the right upper valve flap 7b and the right lower valve flap 7d contact to close the right end of the communication hole 2c, the communication hole 2c forms a complete spherical surface, and further when the communication hole 2c passes through the left sealing ring 8a1 and the right sealing ring 8b1, the left upper valve flap 7a and the left lower valve flap 7c are directly attached to the left sealing ring 8a1, the right upper valve flap 7b and the right lower valve flap 7d are always attached to the right sealing ring 1, the left sealing ring 8a1 and the right sealing ring 8b1 are prevented from being washed away, and the ball valve is closed to finish the action.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.