CN111795172B

CN111795172B - Ball valve

Info

Publication number: CN111795172B
Application number: CN202010630060.7A
Authority: CN
Inventors: 武芳; 李辉; 洪德朋
Original assignee: Ouqiu Valve Co ltd
Current assignee: Ouqiu Valve Co.,Ltd.
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-09-07
Anticipated expiration: 2040-07-03
Also published as: CN111795172A

Abstract

The invention discloses a ball valve which comprises a valve body, wherein a channel and a mounting hole are arranged in the valve body, an upper end cover is arranged at the upper end of the mounting hole of the valve body, and a lower end cover is arranged at the lower end of the mounting hole of the valve body; the lower end cover is rotationally connected with a lower rotating shaft, and the upper end of the lower rotating shaft in the mounting hole is rotationally connected with a lower valve ball; a loop bar is rotationally connected in the upper end cover, and a ball cover is arranged at the lower end of the loop bar; both ends of the channel are fixedly provided with threaded sleeves, the threaded sleeves are connected with a valve seat cylinder in a sliding mode, and a convex shoulder is arranged on the outer side of the valve seat cylinder; a spring is arranged between the threaded sleeve and the convex shoulder; a first transmission assembly is arranged in the mounting hole; mounting grooves are formed in the lower valve ball, and a shaft lever is rotatably connected in each mounting groove; each shaft lever is fixedly provided with a ball core; an adjusting rod is rotationally connected in the sleeve rod, and a second transmission assembly is arranged in the lower valve ball; the ball valve is simple in structure, and the sealing surface of the ball core can be replaced on line without stopping the ball valve.

Description

Ball valve

Technical Field

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

Background

In industrial or domestic infrastructure, media are usually conveyed by means of pipelines, which are regulated as a result of pressure or temperature changes, and regulating means, in particular ball valves, are used in the pipelines for regulating the flow in order to ensure optimum operating conditions and environmental safety. Ball valves are generally valves that use a ball with a circular passage as the opening and closing element, and the ball performs the opening and closing action with the rotation of the valve body. The opening and closing part of the ball valve is a ball body with a through hole and rotates around an axis vertical to the channel, so that the aim of opening and closing the channel is fulfilled. A conventional ball valve is generally a ball having a through hole formed therein and mounted on a valve seat to be opened and closed by rotation of the ball. 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, and is widely applied to the fields of petroleum, chemical industry, power generation, water heating, water conservancy, ships, paper making, atomic energy, aviation, rockets and the like, and the ball valve in the prior art has the following problems in use:

(1) in order to ensure that the existing ball valve does not leak internally, a ball body, namely a closing member, needs to be tightly pressed on a valve seat during installation, the torque is large during opening and closing, the ball body generates friction with the valve seat during rotation, the abrasion is serious, the leakage is easy to cause, the working reliability of the ball valve is reduced, and the service life of the ball valve is shortened; however, the sealing surface of the valve ball of the existing ball valve is fixed, when the sealing surface of the valve ball is damaged, the whole pipeline or equipment needs to be stopped, the whole ball valve needs to be disassembled to maintain or replace the valve ball, the production efficiency is affected, in addition, the equipment is not allowed to be shut down under a plurality of working conditions, and once the equipment is shut down, the serious economic loss can be caused;

(2) the ball valve in the prior art can not realize throttling and flow control, and in order to adjust the flow in the pipeline, a flow adjusting valve is required to be added in the pipeline, so that the configuration cost of the pipeline is increased.

Disclosure of Invention

The invention aims to provide a ball valve which is simple in structure and can replace a sealing surface of a ball core on line without stopping the ball valve.

In order to achieve the purpose, the invention provides the following technical scheme:

a ball valve comprises a valve body, wherein a channel which penetrates through the valve body from left to right is arranged in the valve body, a mounting hole is formed in the valve body along the direction vertical to the channel, an upper end cover is installed at the upper end of the mounting hole of the valve body, and a lower end cover is installed at the lower end of the mounting hole; the lower end cover is internally and rotatably connected with a lower rotating shaft along the axial direction of a mounting hole, the upper end of the lower rotating shaft in the mounting hole is rotatably connected with a lower valve ball, and a through hole is formed in the lower valve ball; a sleeve rod with the lower end extending into the mounting hole is rotatably connected in the upper end cover, and a ball cover fixedly mounted at the upper end of the lower valve ball is arranged at the lower end of the sleeve rod;

both ends of the channel are fixedly provided with screw sleeves, the screw sleeves are connected with a valve seat cylinder in a sliding manner along the axial direction of the channel, and the outer side of one end of the valve seat cylinder, which is positioned in the mounting hole, is provided with a convex shoulder along the radial direction; a spring used for forcing the valve seat barrel to move towards the lower valve ball is arranged between the threaded sleeve and the convex shoulder; a first transmission assembly is arranged between the lower rotating shaft and the two valve seat cylinders in the mounting hole, and when the lower rotating shaft rotates, the two valve seat cylinders are driven to move reversely through the first transmission assembly;

mounting grooves communicated with the through-flow holes are symmetrically formed in the lower valve ball on two sides of the through-flow holes, a shaft lever is rotatably connected between the lower valve ball and the ball cover in each mounting groove, and the shaft levers are arranged along the axial direction of the sleeve rod; each shaft lever is fixedly provided with a ball core, and the peripheral side wall of each ball core is symmetrically provided with two sealing surfaces; the adjusting rod is rotatably connected with the loop bar, the lower end of the adjusting rod penetrates out of the ball cover, a second transmission assembly is arranged between the adjusting rod and the two ball cores in the lower valve ball, and when the adjusting rod rotates, the two ball cores are driven to synchronously rotate to one of the sealing surfaces to be in a working position through the second transmission assembly;

when the ball valve is opened, the through-flow hole rotates to a position coaxial with the channel, and the two valve seat cylinders leave the lower ball; when the ball valve is closed, the through-flow hole is rotated to a position vertical to the channel, and the two valve seat cylinders are respectively pressed on the sealing surfaces of the two ball cores; and a through hole is formed between two sealing surfaces in each ball core, and the flow can be adjusted by adjusting the communication area between the through hole and the valve seat cylinder when the ball valve is closed.

Further, a slot is formed in the ball cover, the second transmission assembly comprises a first gear fixedly mounted on each shaft, and the first gear is located in the slot; the lower end of the adjusting rod is provided with a second gear which is rotatably connected in the cutting groove and connected with the two first gears along the radial direction.

Furthermore, the first transmission assembly comprises a connecting rod, convex edges are symmetrically arranged at the upper end of the lower rotating shaft along the radial direction, upper limiting grooves are formed in the two sides of the lower valve ball in the upper end cover along the axial direction of the channel, an upper sliding rod with the upper end extending into the upper limiting groove is arranged on the convex shoulder of each valve seat barrel, lower limiting grooves are formed in the two sides of the lower valve ball in the lower end cover along the axial direction of the channel, and a lower sliding rod with the lower end extending into the lower limiting groove is arranged on the convex shoulder of each valve seat barrel; the connecting rod is hinged between the lower sliding rod and the convex edge.

Furthermore, a sealing ring is arranged at one end of the valve seat cylinder, which is positioned in the mounting hole.

Furthermore, a first handle rod is fixedly mounted at the upper end of the sleeve rod, and a second handle rod is fixedly mounted at the lower end of the lower rotating shaft.

Furthermore, the upper end of the first handle rod is symmetrically provided with a first positioning hole and a second positioning hole by taking the loop bar as a center, the upper end of the adjusting rod extends out of the loop bar and is fixedly provided with a hand wheel, the hand wheel is provided with a mounting groove on the surface facing the first handle rod, a positioning ball and a positioning spring for forcing the positioning ball to compress on the first handle rod are arranged in the mounting groove, and when the sealing surface of the ball core is positioned at the working position, the positioning ball enters the first positioning hole or the second positioning hole.

Advantageous effects

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

(1) the two ball cores are arranged, two sealing surfaces are arranged between each ball core and the corresponding valve seat cylinder, the second gear and the first gear are driven to rotate through the rotating adjusting rod, and the sealing surfaces of the two ball cores can be controlled to be replaced, so that the sealing surfaces of the ball cores can be replaced under the condition that a pipeline and equipment are not stopped, and the replacement time is greatly saved; in addition, because each ball core is provided with two sealing surfaces, compared with the ball valve in the prior art, the service life is at least doubled, and the service life is long;

(2) the two ball cores are respectively provided with the through holes, so that when the ball valve is in a closed position, the size of the communication area between the through holes and the valve seat cylinder can be controlled through the adjusting rod, and the flow can be adjusted;

(3) the two valve seat cylinders are arranged, and the two ball cores are respectively attached to the two valve seat cylinders when being closed, so that the two valve seat cylinders can be controlled to retract when the ball valve is opened, and then the lower valve ball is rotated through the ball cover, so that no friction exists between the two ball cores and the two valve seat cylinders, and the service life is prolonged.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention, shown in the closed position;

FIG. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1;

FIG. 3 is a schematic view of the two ball valves of the present invention rotated from the position of FIG. 2 for flow control;

FIG. 4 is a schematic cross-sectional view taken along the line B-B in FIG. 1;

FIG. 5 is a schematic diagram of the start-up process of the present invention;

FIG. 6 is a schematic cross-sectional view taken along the line C-C in FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along the direction D-D in FIG. 5;

FIG. 8 is a schematic three-dimensional structure of the lower valve ball of the present invention;

fig. 9-10 are schematic three-dimensional structures of the ball cover and stem of the present invention.

Detailed Description

Referring to fig. 1-10, a ball valve includes a valve body 1, a left-right through channel 101 is provided in the valve body 1, a mounting hole 102 is provided in the valve body 1 along a direction perpendicular to the channel 101, an upper end cover 8 is installed on the upper end of the mounting hole 102 of the valve body 1, and a lower end cover 9 is installed on the lower end of the mounting hole 102; the lower end cover 9 is connected with a lower rotating shaft 10 in a rotating manner along the axial direction of the mounting hole 102, and a second handle rod 13 is fixedly mounted at the lower end of the lower rotating shaft 10; the upper end of the lower rotating shaft 10 in the mounting hole 102 is rotatably connected with a lower valve ball 2, and a through hole 201 is formed in the lower valve ball 2; a sleeve rod 71 with the lower end extending into the mounting hole 102 is rotatably connected to the upper end cover 8, and a ball cover 7 fixedly mounted at the upper end of the lower valve ball 2 is arranged at the lower end of the sleeve rod 71.

Both ends of the channel 101 are fixedly provided with threaded sleeves 3b, the threaded sleeves 3b are connected with valve seat cylinders 3a in a sliding manner along the axial direction of the channel 101, and one ends of the valve seat cylinders 3a, which are positioned in the mounting holes 102, are provided with sealing rings 3; the valve seat cylinder 3a is provided with a shoulder 3a1 along the radial direction at the outer side of one end positioned in the mounting hole 102; a spring 11 for forcing the valve seat barrel 3a to move towards the lower valve ball 2 is arranged between the screw sleeve 3b and the shoulder 3a 1; a first transmission assembly is arranged in the mounting hole 102 between the lower rotating shaft 10 and the two valve seat cylinders 3a, and when the lower rotating shaft 10 rotates, the two valve seat cylinders 3a are driven to move reversely through the first transmission assembly.

Mounting grooves 202 communicated with the through-flow hole 201 are symmetrically formed in the lower valve ball 2 on two sides of the through-flow hole 201, a shaft lever 4 is rotatably connected between the lower valve ball 2 and the ball cover 7 in each mounting groove 202, and the shaft lever 4 is arranged along the axial direction of the loop bar 71; each shaft lever 4 is fixedly provided with a ball core 4a, the peripheral side wall of each ball core 4a is symmetrically provided with two sealing surfaces 4a1, a through hole 4b is formed between the two sealing surfaces 4a1 in each ball core 4a, and when the ball valve is closed, the flow can be adjusted by adjusting the communication area between the through hole 4b and the valve seat cylinder 3 a; the sleeve rod 71 is rotatably connected with an adjusting rod 61 with the lower end penetrating through the ball cover 7; a second transmission assembly is arranged between the adjusting rod 61 and the two ball cores 4a in the lower valve ball 2, and when the adjusting rod 61 rotates, the two ball cores 4a are driven by the second transmission assembly to synchronously rotate to one of the sealing surfaces 4a1 to be in a working position; when the ball valve is opened, the through-flow opening 201 is rotated to a position coaxial with the passage 101 and both seat cylinders 3a are moved away from the lower ball 2; when the ball valve is closed, the through-flow opening 201 is pivoted into a position perpendicular to the channel 101, and the two valve seat cylinders 3a are pressed against the sealing surfaces 4a1 of the two ball cores 4 a.

A cutting groove 7a is formed in the ball cover 7, the second transmission assembly comprises a first gear 5a fixedly mounted on each shaft 4, and the first gear 5a is positioned in the cutting groove 7 a; the lower end of the adjusting rod 61 is provided with a second gear 6 which is rotatably connected in the cutting groove 7a and is connected with the two first gears 5a along the radial direction. The first transmission assembly comprises a connecting rod 12a, convex edges 10a are symmetrically arranged at the upper end of the lower rotating shaft 10 along the radial direction, upper limiting grooves 8a are respectively formed in the two sides of the lower valve ball 2 in the upper end cover 8 along the axial direction of the channel 101, an upper sliding rod 302 with the upper end extending into the upper limiting groove 8a is arranged on a convex shoulder 3a1 of each valve seat barrel 3a, lower limiting grooves 9a are respectively formed in the two sides of the lower valve ball 2 in the lower end cover 9 along the axial direction of the channel 101, and a lower sliding rod 301 with the lower end extending into the lower limiting groove 9a is arranged on a convex shoulder 3a1 of each valve seat barrel 3 a; the connecting rod 12a is hinged between the lower slide bar 301 and the convex edge 10 a.

The upper end of the loop bar 71 is fixedly provided with a first handle bar 15. The upper end of the first handle rod 15 is symmetrically provided with a first positioning hole 151 and a second positioning hole 152 by taking the sleeve rod 71 as a center, the upper end of the adjusting rod 61 extends out of the sleeve rod 71 and is fixedly provided with a hand wheel 13, the hand wheel 13 is provided with a mounting groove 141 on the surface facing the first handle rod 15, a positioning ball 142 and a positioning spring 143 used for forcing the positioning ball 142 to be pressed on the first handle rod 15 are arranged in the mounting groove 141, and when the sealing surface 4a1 of the ball core 4a is at the working position, the positioning ball 142 enters the first positioning hole 151 or the second positioning hole 152.

When the valve is used, the sleeve rod 71 is driven to rotate by the first handle rod 15, the lower valve ball 2 is driven to rotate by the ball cover 7 when the sleeve rod 71 rotates, and the ball valve is opened when the through-flow hole 201 rotates to a position coaxial with the channel 101; when the through-flow hole 201 is rotated to be perpendicular to the passage 101, the two ball cores 4a are rotated to positions facing the two seat cylinders 3a, the sealing surfaces 4a1 of the two ball cores 4a seal the two seat cylinders 3a, and the ball valve is closed. When the present invention is in the closed position, there are two working states, in the first state, the positioning ball 142 enters the first positioning hole 151, and a seal is formed between one sealing surface 4a1 of the ball core 4a and the valve seat cylinder 3 a; in the second state, the second gear 6 drives the two first gears 5a to rotate simultaneously by rotating the adjustment rod 61, and further drives the two ball cores 4a to rotate, and when the positioning ball 142 enters the second positioning hole 152, a seal is formed between the other sealing surface 4a1 of the ball core 4a and the valve seat cylinder 3 a.

When the valve ball valve is opened from a closed position, the second handle rod 13 is rotated, the second handle rod 13 drives the lower rotating shaft 10 to rotate, the lower rotating shaft 10 pushes the valve seat cylinder 3a to move towards the direction far away from the lower valve ball 2 through the matching of the connecting rod 12a and the lower sliding rod 301 when rotating, the second handle rod 13 stops rotating until the connecting rod 12a rotates to the axial position along the channel 101, and then the first handle rod 15 is rotated, so that the lower valve ball 2 rotates to an opened position; when the valve is closed from the opening position, the first handle rod 15 is rotated firstly, so that the lower valve ball 2 is rotated to the closing position; then, the second handle rod 13 is rotated reversely, the second handle rod 13 drives the lower rotating shaft 10 to rotate, the lower rotating shaft 10 drives the valve seat cylinder 3a to move towards the direction close to the lower valve ball 2 through the matching of the connecting rod 12a and the lower sliding rod 301 when rotating, until the valve seat cylinder 3a is pressed on the sealing surface 4a1 of the ball core 4a under the action of the spring 11, and therefore the closing of the ball valve is completed.

When the flow rate of the invention needs to be adjusted, the adjusting rod 61 is rotated at the closing position shown in fig. 1, so that the through hole 4b is communicated with the valve seat cylinder 3a, the rotating angles of the adjusting rod 61 are different, and the communicating areas of the through hole 4b and the valve seat cylinder 3a are also different, thereby realizing the flow rate adjusting function.

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.

Claims

1. A ball valve comprises a valve body, wherein a channel which penetrates through the valve body from left to right is arranged in the valve body, a mounting hole is formed in the valve body along the direction vertical to the channel, an upper end cover is installed at the upper end of the mounting hole of the valve body, and a lower end cover is installed at the lower end of the mounting hole; the valve ball is characterized in that a lower rotating shaft is rotatably connected in the lower end cover along the axial direction of a mounting hole, a lower valve ball is rotatably connected at the upper end of the lower rotating shaft in the mounting hole, and a through hole is formed in the lower valve ball; a sleeve rod with the lower end extending into the mounting hole is rotatably connected in the upper end cover, and a ball cover fixedly mounted at the upper end of the lower valve ball is arranged at the lower end of the sleeve rod;

when the ball valve is opened, the through-flow hole rotates to a position coaxial with the channel, and the two valve seat cylinders leave the lower ball; when the ball valve is closed, the through-flow hole is rotated to a position vertical to the channel, and the two valve seat cylinders are respectively pressed on the sealing surfaces of the two ball cores; and a through hole is formed between two sealing surfaces in each ball core, and when the ball valve is closed, the flow can be adjusted by adjusting the communication area between the through hole and the valve seat cylinder.

2. The ball valve of claim 1, wherein a slot is provided in the ball cover, the second transmission assembly includes a first gear fixedly mounted on each shaft, and the first gears are located in the slot; the lower end of the adjusting rod is provided with a second gear which is rotatably connected in the cutting groove and connected with the two first gears along the radial direction.

3. The ball valve according to claim 1, wherein the first transmission assembly comprises a connecting rod, the upper end of the lower rotating shaft is symmetrically provided with convex edges along the radial direction, the two sides of the lower valve ball in the upper end cover are provided with upper limiting grooves along the axial direction of the channel, the convex edge of each valve seat barrel is provided with an upper sliding rod, the upper end of the upper sliding rod extends into the upper limiting groove, the two sides of the lower valve ball in the lower end cover are provided with lower limiting grooves along the axial direction of the channel, and the convex edge of each valve seat barrel is provided with a lower sliding rod, the lower end of the lower sliding rod extends into the lower limiting groove; the connecting rod is hinged between the lower sliding rod and the convex edge.

4. The ball valve of claim 1, wherein the seat cylinder is provided with a sealing ring at one end located within the mounting bore.

5. The ball valve according to claim 1, wherein a first handle bar is fixedly mounted at an upper end of the loop bar, and a second handle bar is fixedly mounted at a lower end of the lower rotating shaft.

6. The ball valve according to claim 5, wherein the upper end of the first handle rod is symmetrically provided with a first positioning hole and a second positioning hole by taking the loop bar as a center, the upper end of the adjusting rod extends out of the loop bar and is fixedly provided with a hand wheel, the hand wheel is provided with a mounting groove on the surface facing the first handle rod, a positioning ball and a positioning spring for forcing the positioning ball to press the first handle rod are arranged in the mounting groove, and when the sealing surface of the ball core is in the working position, the positioning ball enters the first positioning hole or the second positioning hole.