A valve ball with a movable sealing ring and a ball valve

Abstract

The present invention provides a valve ball and a ball valve with a movable sealing ring. The valve ball includes: a sphere; a movable sealing ring rotatably mounted on the sphere and having an annular sealing surface; the annular sealing surface is an eccentric sealing surface; the movable sealing ring has a fixed state and a rotatable state. When the movable sealing ring is in the fixed state, the movable sealing ring and the sphere are fixed as a whole; when the movable sealing ring is in the rotatable state, under the action of an external force, the annular sealing surface can rotate relative to the valve seat sealing surface. For the valve ball of the present invention, when the valve seat sealing surface and the annular sealing surface cannot be in close contact to achieve sealing during assembly, the movable sealing ring can be loosened to the rotatable state, and the movable sealing ring is gradually rotated until the annular sealing surface is in close contact with the valve seat sealing surface for sealing. At this time, the movable sealing ring is fixed on the sphere, and the precise assembly of the valve ball is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, and in particular to a valve ball with a movable sealing ring and a ball valve. Background Art

[0002] Ball valve is one of the most widely used valves. It has a simple structure, reliable sealing and easy maintenance. It is widely used in the fields of petroleum, chemical industry, metallurgy, textile, food, atomic energy, aviation, etc. The ball valve has a 90° rotation action. The plug body is a sphere with a circular through hole or channel passing through its axis. It is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It can be tightly closed by rotating 90° and a very small torque.

[0003] The sealing of conventional ball valves relies on the precise extrusion sealing of the valve seat sealing surface and the ball sealing surface, which requires very high processing accuracy and installation accuracy of the valve seat sealing surface and the ball sealing surface. Once there is a slight deviation in processing or installation, bias pressure may occur, affecting the sealing effect, and in severe cases, it may cause sealing failure. The valve seat in the prior art is usually fixedly installed on the valve cover. When the ball valve is closed, the spherical surface of the valve ball is squeezed into contact with the valve seat sealing surface of the valve seat to achieve sealing; this requires very high installation accuracy of the valve seat, which usually involves multiple fine-tuning processes, and even if the installation accuracy is achieved at the beginning, bias wear may occur after a certain period of use, resulting in uneven sealing pressure between the valve seat sealing surface and the spherical surface, which in turn leads to reduced sealing strength, and even serious sealing failure.

[0004] Chinese patent document CN108980400B discloses an eccentric ball valve, whose valve seat can be slightly moved on the valve cover through an adjustable mounting structure, and there is a gap between the outer circumferential surface of the valve seat and the valve cover; when the valve ball rotates to gradually squeeze and contact the valve ball sealing surface and the valve seat sealing surface under the drive of the operating mechanism, the valve seat can move slightly along its circumferential direction, so that the valve ball sealing surface and the valve seat sealing surface are automatically adjusted and aligned, thereby achieving a uniform pressure seal. Although the technical solution in the above patent document can solve the problem of slight deviations in installation, it has high requirements for production accuracy.

[0005] Therefore, how to design a valve ball that is easier to process and use and can solve the technical problem of multiple fine-tuning required during the installation process is a technical problem that needs to be solved urgently in the prior art. Summary of the invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the technical defect that the ball valve in the prior art can solve the problem of slight deviations during installation and does not require multiple adjustments, but has high production precision requirements, thereby providing a valve ball that is more convenient to produce and use.

[0007] The present invention also provides a ball valve having the above-mentioned valve ball.

[0008] For this purpose, the present invention provides a valve ball with a movable sealing ring, including:

[0009] A sphere;

[0010] A movable sealing ring rotatably mounted on the sphere and having an annular sealing surface; the annular sealing surface is an eccentric sealing surface;

[0011] The movable sealing ring has a fixed state and a rotatable state. When the movable sealing ring is in the fixed state, the movable sealing ring and the sphere are fixed as a whole; when the movable sealing ring is in the rotatable state, under the action of an external force, the annular sealing surface can rotate relative to the valve seat sealing surface.

[0012] As a preferred solution, the movable sealing ring includes an annular main body, a rotation hole is provided in the middle of the annular main body, and the annular sealing surface is provided on the periphery of the annular main body.

[0013] As a preferred solution, the rotation hole is a through hole.

[0014] As a preferred solution, the sphere is provided with:

[0015] A first plane formed at one end of the sphere for sealing;

[0016] A first stepped column formed on the first plane and perpendicular to the first plane; the first stepped column is adapted to be rotatably sleeved by the rotation hole, and the height of the first stepped column ≤ the thickness of the movable sealing ring;

[0017] A gland removably and fixedly mounted on the sphere for fixing the movable sealing ring sleeved on the first stepped column.

[0018] As a preferred solution, a second plane is provided on the top surface of the first stepped column, and a second stepped column is formed on the second plane. After the gland is sleeved on the second stepped column, it is fixedly mounted on the second plane by bolts.

[0019] As a preferred solution, on the first plane opposite to the movable sealing ring, a sealing ring installation groove is provided, and a sealing ring is installed inside the sealing ring installation groove.

[0020] As a preferred solution, a bolt groove is provided at one end of the gland away from the sphere. After the bolt fixes the gland on the second plane, the head of the bolt is sunk into the bolt groove.

[0021] As a preferred solution, the sphere is a C-shaped sphere.

[0022] The present invention also provides a ball valve, which includes a valve body, a valve ball installed inside the valve body through a valve stem, a valve cover installed on the valve body, and a valve seat installed inside the valve cover. The valve seat is provided with a valve seat sealing surface.

[0023] The valve ball is the valve ball described in any one of the above, and both the annular sealing surface and the valve seat sealing surface are eccentric sealing surfaces.

[0024] As a preferred solution, the annular sealing surface of the movable sealing ring extends a certain distance around the sphere.

[0025] The technical solution provided by the present invention has the following advantages:

[0026] 1. The valve ball of the present invention includes a sphere and a movable sealing ring rotatably installed on the sphere, and the movable sealing ring has an eccentric sealing surface; when the movable sealing ring is in a fixed state, the movable sealing ring and the sphere are fixed as a whole, and the movable sealing ring rotates with the sphere to open or cut off the flow channel; when the movable sealing ring is in a rotatable state, under the action of an external force, the annular sealing surface can rotate relative to the valve seat sealing surface; for the valve ball of the present invention, when it is assembled and the valve seat sealing surface and the annular sealing surface cannot be in close contact to achieve sealing, the movable sealing ring can be loosened to a rotatable state, and the movable sealing ring is gradually rotated until the annular sealing surface is in close contact with the valve seat sealing surface for sealing. At this time, the movable sealing ring is fixed on the sphere, that is, the precise assembly of the valve ball is achieved. The valve ball of the present invention can solve the technical problem that it is easy to have slight deviations during installation and requires multiple fine-tuning.

[0027] 2. For the valve ball of the present invention, the movable sealing ring includes an annular main body, a rotating hole is provided in the middle of the annular main body, and an annular sealing surface is provided on the periphery of the annular main body; the movable sealing ring is installed on the sphere through the rotating hole, and when adjustment is required, the movable sealing ring rotates through the position of the rotating hole.

[0028] 3. For the valve ball of the present invention, the sphere is provided with a first plane and a first stepped column, the movable sealing ring is sleeved on the first stepped column, and is fixedly installed on the sphere by using a gland, and the movable sealing ring sleeved on the first stepped column is squeezed and fixed.

[0029] 4. For the valve ball of the present invention, the top surface of the first stepped column is provided with a second plane, and a second stepped column is formed on the second plane. After the gland is sleeved on the second stepped column, it is fixedly installed on the second plane through bolts; the design of the second stepped column and the second plane is more convenient for the fixation of the gland.

[0030] 5. The valve ball of the present invention is provided with a sealing ring installation groove on the first plane opposite to the movable sealing ring. A sealing ring is installed in the sealing ring installation groove to assist in sealing when the movable sealing ring is installed.

[0031] 6. The present invention also provides a ball valve, which includes a valve body, a valve stem, a valve ball, a valve seat, a valve cover, etc. The valve ball therein is the above-mentioned valve ball. Due to the adoption of the above valve ball structure, it naturally has all the advantages brought by the adoption of the above valve ball structure.

[0032] 7. In the ball valve of the present invention, the annular sealing surface of the movable sealing ring extends a certain distance around. The valve ball does not contact the valve seat. When wear occurs during long-term use and good sealing cannot be achieved, the movable sealing ring can be replaced, thereby reducing the equipment replacement cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the prior art or the specific embodiments of the present invention, the following briefly introduces the drawings used in the description of the prior art or the specific embodiments.

[0034] Figure 1 It is a schematic diagram of the overall structure of the valve ball of the present invention.

[0035] Figure 2 It is Figure 1 an enlarged schematic diagram of the structure of part A in

[0036] Reference numerals: 1, sphere; 11, first plane; 12, first stepped column; 13, second plane; 14, second stepped column; 2, movable sealing ring; 20, rotation hole; 21, annular sealing surface; 22, annular main body; 3, valve seat; 31, valve seat sealing surface; 4, gland; 41, bolt groove; 5, bolt; 6, sealing ring installation groove; 71, valve body; 72, valve stem; 73, valve cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following describes the technical solutions of the present invention in detail with reference to the drawings. Embodiment 1

[0038] This embodiment provides a valve ball with a movable sealing ring. Referring to Figure 1-2 as shown, it includes: a sphere 1; a movable sealing ring 2 rotatably installed on the sphere 1 and having an annular sealing surface 21; the annular sealing surface 21 is an eccentric sealing surface.

[0039] The movable sealing ring 2 has a fixed state and a rotatable state. When the movable sealing ring 2 is in the fixed state, the movable sealing ring 2 and the sphere 1 are fixed as a whole; when the movable sealing ring 2 is in the rotatable state, under the action of an external force, the annular sealing surface 21 can rotate relative to the valve seat sealing surface 31.

[0040] For the valve ball of this embodiment, when the valve seat sealing surface 31 and the annular sealing surface 21 cannot be in close contact to achieve sealing during assembly, the movable sealing ring 2 can be loosened to a rotatable state, and the movable sealing ring 2 is gradually rotated until the annular sealing surface 21 is in close contact with the valve seat sealing surface 31 for sealing. At this time, the movable sealing ring 2 is fixed on the sphere 1, thus realizing the precise assembly of the valve ball. The valve ball of this embodiment can solve the technical problem that slight deviations are likely to occur during installation and multiple fine-tuning is required.

[0041] In this embodiment, the movable sealing ring 2 includes an annular main body 22. A rotation hole 20 is provided in the middle of the annular main body 22, and the annular sealing surface 21 is provided on the periphery of the annular main body 22. Specifically, the rotation hole 20 is a through hole. As a deformation scheme, the rotation hole 20 can also be a blind hole.

[0042] The sphere 1 is provided with: a first plane 11 formed at one end of the sphere 1 for sealing; a first stepped column 12 formed on the first plane 11 and perpendicular to the first plane 11; the first stepped column 12 is adapted to be rotatably sleeved by the rotation hole 20, and the height of the first stepped column 12 ≤ the thickness of the movable sealing ring 2; a gland 4 detachably and fixedly installed on the sphere 1 for fixing the movable sealing ring 2 sleeved on the first stepped column 12.

[0043] When the valve ball is in the closed position, the first plane 11 faces the flow channel, and the axis of the first stepped column 12 coincides with the axis of the flow channel.

[0044] A second plane 13 is provided on the top surface of the first stepped column 12, and a second stepped column 14 is formed on the second plane 13. After the gland 4 is sleeved on the second stepped column 14, it is fixedly installed on the second plane 13 through a bolt 5. The design of the second stepped column 14 and the second plane 13 makes it more convenient to fix the gland 4.

[0045] On the first plane 11 opposite to the movable sealing ring 2, a sealing ring installation groove 6 is provided, and a sealing ring is installed inside the sealing ring installation groove 6. It helps with sealing when the movable sealing ring is installed.

[0046] A bolt groove 41 is provided at one end of the gland 4 away from the sphere 1. After the bolt 5 fixes the gland 4 on the second plane 13, the head of the bolt 5 is immersed inside the bolt groove 41. Such a design can reduce the resistance during the flow of the medium and can also prevent damage to the bolt 5 caused by the erosion of the medium.

[0047] In this embodiment, the sphere is a C-shaped sphere. As a deformation, the sphere can also be a sphere with other structures. Embodiment 2

[0048] This embodiment provides a ball valve. As Figure 1 shown, it includes a valve body 71, a ball valve installed inside the valve body 71 through a valve stem 72, a valve cover 73 installed on the valve body 71, and a valve seat 3 installed inside the valve cover 73. The valve seat 3 is provided with a valve seat sealing surface 31. Among them, the ball valve is the ball valve described in Embodiment 1, and both the annular sealing surface 21 and the valve seat sealing surface 31 are eccentric sealing surfaces.

[0049] Due to the adoption of the above ball valve structure, the ball valve of this embodiment naturally has all the advantages brought by the adoption of the above ball valve structure.

[0050] The annular sealing surface 21 of the movable sealing ring 2 extends a certain distance around the sphere 1. The ball valve 1 does not contact the valve seat 3. When wear occurs during long-term use and good sealing cannot be achieved, the movable sealing ring 2 can be replaced, thereby reducing the equipment replacement cost.

[0051] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A valve ball assembly method with a movable sealing ring, characterized in that: Comprising: A sphere (1); A movable seal ring (2), rotatably mounted on the sphere (1), having an annular seal surface (21); the annular seal surface (21) is an eccentric seal surface; The movable seal ring (2) has a fixed state and a rotatable state. When the movable seal ring (2) is in the fixed state, the movable seal ring (2) and the sphere (1) are fixed as a whole; when the movable seal ring (2) is in the rotatable state, under the action of an external force, the annular seal surface (21) can rotate relative to the valve seat seal surface (31), thereby changing the relative position between the annular seal surface (21) and the valve seat seal surface (31) to achieve precise alignment of the seal surfaces; When the valve seat seal surface (31) and the annular seal surface (21) cannot be in close contact to achieve sealing during assembly, loosen the movable seal ring (2) to the rotatable state, gradually rotate the movable seal ring (2) until the annular seal surface (21) is in close contact with the valve seat seal surface (31) for sealing. At this time, fix the movable seal ring (2) on the sphere (1), and the precise assembly of the valve ball can be achieved.

2. The valve ball assembly method according to claim 1, characterized in that: The movable seal ring (2) includes an annular main body (22), a rotation hole (20) is provided in the middle of the annular main body (22), and the annular seal surface (21) is provided on the periphery of the annular main body (22).

3. The valve ball assembly method according to claim 2, characterized in that: The rotation hole (20) is a through hole.

4. The valve ball assembly method according to claim 3, characterized in that: On the sphere (1) there are provided: A first plane (11), formed at one end of the sphere (1) for sealing; A first stepped column (12), formed on the first plane (11) and perpendicular to the first plane (11); the first stepped column (12) is adapted to be rotatably sleeved by the rotation hole (20), and the height of the first stepped column (12) ≤ the thickness of the movable seal ring (2); A gland (4), detachably and fixedly installed on the sphere (1) for fixing the movable seal ring (2) sleeved on the first stepped column (12).

5. The valve ball assembly method according to claim 4, characterized in that: A second plane (13) is provided on the top surface of the first stepped column (12), and a second stepped column (14) is formed on the second plane (13). After the gland (4) is sleeved on the second stepped column (14), it is fixedly installed on the second plane (13) by a bolt (5).

6. The valve ball assembly method according to claim 5, characterized in that: On the first plane (11) opposite to the movable seal ring (2), a seal ring installation groove (6) is provided, and a seal ring is installed inside the seal ring installation groove (6).

7. The valve ball assembly method according to claim 5, characterized in that: One end of the gland (4) away from the sphere (1) is provided with a bolt groove (41). After the bolt (5) fixes the gland (4) on the second plane (13), the head of the bolt (5) sinks into the bolt groove (41).

8. The valve ball assembly method according to claim 1, characterized in that: The sphere is a C-shaped sphere.

9. A ball valve assembly method, comprising a valve body (71), a valve ball installed inside the valve body (71) through a valve stem (72), a valve cover (73) installed on the valve body (71), and a valve seat (3) installed inside the valve cover (73), wherein a valve seat sealing surface (31) is provided on the valve seat (3). It is characterized in that: The valve ball is assembled by using the valve ball assembly method described in any one of claims 1-8, and both the annular sealing surface (21) and the valve seat sealing surface (31) are eccentric sealing surfaces.

10. The ball valve assembly method according to claim 9, characterized in that: The annular sealing surface (21) of the movable sealing ring (2) extends a certain distance around the sphere (1).

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