阅读说明：本技术 一种半球体金属密封固定球阀 (Hemisphere metal seal fixed ball valve ) 是由 周向青 武晓东 于 2019-10-30 设计创作，主要内容包括：本发明公开了球阀技术领域的一种半球体金属密封固定球阀,旨在解决现有技术中阀门中腔死角多,物料易堆积,造成阀门操作性差、易泄露的技术问题,包括阀体,阀芯通过阀杆与枢轴支撑在所述阀体内部,所述阀杆与所述阀体之间设有压盖法兰,所述阀杆驱动所述阀芯以所述枢轴为转轴转动实现阀门的开和闭,所述阀体上设有阀盖,所述阀盖内设有阀座,所述阀盖与所述阀座之间设有多个弹簧,所述阀盖通过所述弹簧将所述阀座挤压在所述阀芯上,所述阀座与所述阀芯的外表面形成密封副,所述阀座在所述阀座与所述阀芯的接触面上设有刮刀结构。减少了阀体内的死角,提高了阀门的可操作性,同时通过增设刮刀结构清除结晶物料,提高了球阀的密封性和使用寿命。(The invention discloses a hemispheroidal metal seal fixed ball valve in the technical field of ball valves, and aims to solve the technical problems of poor operability and easy leakage of a valve due to the fact that a valve body has more dead corners in a valve middle cavity and materials are easy to accumulate in the prior art. Dead angles in the valve body are reduced, operability of the valve is improved, crystalline materials are removed through the additionally arranged scraper structure, and sealing performance and service life of the ball valve are improved.)

1. A hemisphere metal seal fixed ball valve is characterized by comprising a valve body, a valve core is supported inside the valve body through a valve rod and a pivot, a gland flange is arranged between the valve rod and the valve body, the valve rod drives the valve core to rotate by taking the pivot as a rotating shaft to realize opening and closing of the valve, a valve cover is arranged on the valve body, a valve seat is arranged in the valve cover, a plurality of springs are arranged between the valve cover and the valve seat, the valve cover extrudes the valve seat on the valve core through the springs, a sealing pair is formed between the valve seat and the outer surface of the valve core, and a scraper structure is arranged on the contact surface of the valve seat and the valve core.

2. The hemispherical metal seal fixed ball valve of claim 1, wherein the valve core is hemispherical.

3. The hemispherical metal seal fixed ball valve as claimed in claim 1, wherein the valve cover is connected with the valve body through threads.

4. A hemispherical metal seal fixed ball valve as claimed in claim 1 wherein a bearing is provided between said valve stem and said valve body.

5. The hemispherical metal seal fixed ball valve of claim 1, wherein a bearing is provided between the pivot and the valve core.

6. A hemispherical metal seal fixed ball valve as claimed in claim 1 wherein the lower end face of said gland flange presses said valve stem through a thrust pad.

7. The hemispherical metal seal fixed ball valve of claim 1, wherein a first O-ring is disposed between said valve stem and said gland flange.

8. The hemispherical metal seal fixed ball valve of claim 1, wherein a first graphite gasket is disposed between said gland flange and said valve body.

9. A hemispherical metal seal fixed ball valve as claimed in claim 1 wherein a third O-ring is provided between said valve cover and said valve seat.

10. The hemispherical metal seal fixed ball valve as claimed in claim 1, wherein a fourth O-ring is arranged between the valve cover and the valve body.

Technical Field

The invention belongs to the technical field of ball valves, and particularly relates to a hemispheroidal metal seal fixed ball valve.

Background

The ball valve is suitable for conveying materials such as urea, liquid metal and the like which are easy to crystallize and condense, materials such as slurry and ore pulp which contain a large amount of hard solid particles, or viscous fluids (such as petroleum and the like which contain wax and asphalt in a high degree), but solid particle substances are easy to accumulate in a cavity in the valve, and the cavity is easy to block, so that the valve torque surge and even the blockage fault are caused. The common double-side sealed fixed ball valve has large torque, heavy weight, long structural size, more dead angles when fluid passes through, easy accumulation of materials, poor operational reliability of the valve and greatly reduced service life of the valve.

Disclosure of Invention

The invention aims to provide a hemispheroidal metal sealing fixed ball valve, which aims to solve the technical problems of poor valve operability and easy leakage caused by more dead angles of a valve middle cavity and easy accumulation of materials in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a hemisphere metal seal fixed ball valve comprises a valve body, wherein a valve core is supported inside the valve body through a valve rod and a pivot, a gland flange is arranged between the valve rod and the valve body, the valve rod drives the valve core to rotate by taking the pivot as a rotating shaft to realize opening and closing of the valve, a valve cover is arranged on the valve body, a valve seat is arranged in the valve cover, a plurality of springs are arranged between the valve cover and the valve seat, the valve cover extrudes the valve seat on the valve core through the springs, a sealing pair is formed on the outer surface of the valve seat and the outer surface of the valve core, and a scraper structure is arranged on the contact surface of the valve seat and the valve core.

The valve core is of a hemispherical structure.

The valve cover is connected with the valve body through threads.

And a bearing is arranged between the valve rod and the valve body.

And a bearing is arranged between the pivot and the valve core.

The lower end face of the gland flange presses the valve rod through a thrust pad.

And a first O-shaped ring is arranged between the valve rod and the gland flange.

And a first graphite gasket is arranged between the gland flange and the valve body.

And a third O-shaped ring is arranged between the valve cover and the valve seat.

And a fourth O-shaped ring is arranged between the valve cover and the valve body.

Compared with the prior art, the invention has the following beneficial effects: the hemispherical metal sealing fixed ball valve reduces dead angles in the valve body by adopting the hemispherical valve core, improves the operability of the valve by adding the bearing between the valve rod and the valve body and additionally arranging the bearing between the pivot and the valve core, and simultaneously removes crystal materials by additionally arranging the scraper structure on the contact surface of the valve seat and the valve core, thereby greatly improving the sealing property, the operability and the service life of the ball valve.

Drawings

FIG. 1 is a schematic longitudinal sectional view of a hemispherical metal-sealed fixed ball valve according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a hemispherical metal-sealed fixed ball valve according to an embodiment of the present invention;

in the figure: 1. a valve body; 2. a valve cover; 3. a valve seat; 4. a valve core; 5. a pivot; 6. a valve stem; 7. a gland flange; 8. a fourth O-ring; 9. a spring; 10. a third O-ring; 11. a first O-ring; 12. a first graphite gasket; 13. a fifth O-ring; 14. a thrust pad; 15. a second O-ring; 16. a second graphite gasket; 17. a first bearing; 18. a second bearing.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

As shown in fig. 1 and 2, a hemispherical metal-sealed fixed ball valve includes: the valve comprises a valve body 1, a valve cover 2, a valve seat 3, a valve core 4, a pivot 5, a valve rod 6 and a gland flange 7. The valve body 1 is connected with the valve cover 2 through an internal thread arranged on the valve body 1 and an external thread arranged on the valve cover 2. The upper portion of valve body 1 is equipped with valve rod 6, and valve rod 6 with set up in the inside of valve body 1 with case 4 support at valve body 1 lower part pivot 5, case 4 is the hemisphere structure, and the case 4 of hemisphere structure and the design of single valve seat 3 make directly be connected with valve body 1 before the valve and form the cavity, impurity and dust are difficult for piling up on sealed face, have protected the sealed face of disk seat, have reduced the dead angle between case 4 and the valve body 1. The combined part of the valve rod 6 and the valve body 1 is provided with a gland flange 7, the lower end face of the gland flange 7 presses the valve rod 6 through a thrust pad 14, friction between the valve rod 6 and the gland flange 7 during rotation is reduced, the combined part of the gland flange 7 and the valve body 1 is provided with a fifth O-shaped ring 13 and a first graphite gasket 12, the O-shaped ring is reliable in sealing performance, the graphite gasket can enhance the high-temperature sealing performance of the valve, and a first O-shaped ring 11 is arranged between the gland flange 7 and the valve rod 6. The joint part of the pivot 5 and the valve body 1 is provided with a second O-shaped ring 15 and a second graphite gasket 16, the sealing performance of the O-shaped ring is reliable, and the graphite gasket can enhance the high-temperature sealing performance between the pivot 5 and the valve body 1. Be equipped with fourth O shape circle 8 between valve body 1 and valve gap 2, be equipped with third O shape circle 10 and cylinder spring 9 between valve gap 2 and the disk seat 3, valve gap 2 passes through spring 9 and extrudes disk seat 3 on case 4, guarantees the initial sealed of case 4 and disk seat 3, and valve gap 2 can compensate because the case 4 and the not good valve seal leakage problem that produces of disk seat 3 cooperation. The outer surfaces of the valve seat 3 and the valve core 4 form a sealing pair, the scraper structure 19 is arranged on the contact surface of the valve seat 3 and the valve core 4 of the valve seat 3, and the scraper structure 19 can remove crystalline materials on the outer surface of the valve core in the opening and closing processes of the valve, so that the sealing performance, operability and service life of the ball valve are greatly improved. A first bearing 17 is arranged between the valve rod 6 and the valve body 1, a second bearing 18 is arranged between the pivot 5 and the valve core 4, both the first bearing 17 and the second bearing 18 adopt sliding bearings, and the first bearing 17 can reduce the friction force between the valve body 1 and the valve rod 6 to reduce the valve torque; the second bearing 18 can effectively reduce the friction force between the valve core 4 and the pivot 5 so as to achieve the purpose of reducing the torque. The sliding bearing can reduce the friction resistance and improve the operability of the valve in the opening and closing process.

The assembly sequence of the hemisphere metal sealing fixed ball valve is as follows: firstly, a valve core 4 provided with a second bearing 18 is placed into a valve body 1, a valve rod 6 is arranged at the upper part of the valve body 1 and is aligned with a valve rod groove of the valve core 4, a pivot 5 sleeved with a second O-shaped ring 15 and a second graphite gasket 16 is inserted into the lower part of the valve body 1, the pivot 5 is inserted into a pivot hole of the valve core 4, a gland flange 7 is arranged at the position of the valve rod 6, a valve seat 3 sleeved with a third O-shaped ring 10 provided with a spring 9 is placed into a seat hole of a valve cover 2, and then the threaded valve cover 2 is pre-tightened by a tool; when the device is disassembled, the operation is carried out in a reverse order.

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