Ball valve with improved sealing structure

Abstract

The utility model provides a ball valve with an improved sealing structure, which relates to the technical field of ball valve sealing and comprises an auxiliary valve body and a main valve body, an arc-shaped cavity is arranged between the inner walls of the main valve body and close to the edge of one side, and a spherical valve core is arranged in the arc-shaped cavity. The inner wall of one side of the arc-shaped cavity and the inner wall of one side of the auxiliary valve body are each provided with a sealing groove, the inner walls of one sides of the two sealing grooves are each provided with a valve body sealing face sharp corner, and sealing bases are arranged in the two sealing grooves. When the valve is opened and closed, the sealing seat does not deviate and is always kept at the same position, so that the internal sealing effect is stable, when the sharp corner of the sealing surface of the valve body penetrates into the sealing seat, the sealing seat has the sealing compression amount, the leakage prevention performance is better, the compression amount of packing on the outer side of the valve rod can be reduced, and the operation torque of the valve is small.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valve sealing, in particular to a ball valve with an improved sealing structure. Background Technique

[0002] A ball valve is a valve in which the closing and opening member (ball) is driven by a valve stem and rotates around the axis of the ball valve. It can also be used for the regulation and control of fluids. Among them, the hard-sealed V-type ball valve has a strong shearing force between the V-type ball core and the metal valve seat welded with hard alloy, and is especially suitable for media containing fibers, tiny solid particles, etc. The soft-sealed ball valve uses replaceable seals, which are convenient for use and maintenance and have good sealing performance, and are widely used. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium on the pipeline, but also close any channel to connect the other two channels.

[0003] At present, when assembling a ball valve, it is necessary to dock the sealing seat and the valve body. Due to the influence of the tolerance of the valve body sealing part on the sealing seat, there will be an offset during installation, which will affect the internal sealing strength of the valve. Content of the Utility Model

[0004] The utility model aims to solve the problems of the prior art and provides a ball valve with an improved sealing structure.

[0005] To solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0006] A ball valve with an improved sealing structure includes a secondary valve body and a main valve body. An arc-shaped cavity is formed between the inner walls of the main valve body near one side edge. A spherical valve core is arranged inside the arc-shaped cavity. Sealing grooves are formed on one inner wall of the arc-shaped cavity and one inner wall of the secondary valve body. Valve body sealing surface sharp corners are arranged on one inner wall of the two sealing grooves. Sealing seats are arranged inside the two sealing grooves. The outer surfaces of one side of the two sealing seats are respectively and correspondingly attached to the outer surface of the spherical valve core. The valve body sealing surface sharp corners are pierced into the plastic sealing seats, ensuring that the sealing seats will not shift during the opening and closing of the valve and always remain in the same position, making the internal sealing effect stable. When the valve body sealing surface sharp corners are pierced into the sealing seats, there is already a sealing compression amount for the sealing seats themselves, and the anti-external leakage performance is better. The compression amount of the packing outside the valve stem can be reduced, so the operating torque of the valve is small.

[0007] Optionally, the tip parts of the valve body sealing surface sharp corners extend into the sealing seats. The secondary valve body and the main valve body are engaged with each other, and the opening of the arc-shaped cavity faces the side of the secondary valve body.

[0008] Optionally, a sealing washer is provided between the opposite sides of the auxiliary valve body and the main valve body, and locking bolts are provided between the auxiliary valve body and the main valve body. Setting the sealing washer between the auxiliary valve body and the main valve body can improve the sealing performance at their docking place and prevent leakage.

[0009] Optionally, a docking groove is formed at the top of the spherical valve core, and a valve stem is provided at the top of the main valve body.

[0010] Optionally, the bottom of the valve stem slides through to the inside of the arc-shaped cavity, and the bottom of the valve stem is connected to the inside of the docking groove.

[0011] Optionally, packing is filled between the outer surface of the valve stem and the inside of the main valve body. A gland is provided at the top of the main valve body between the outer surfaces of the valve stem. The bottom of the gland fits against the top of the packing, and the packing can be compacted by the gland.

[0012] After adopting the above technical solution, the present utility model has the following beneficial effects compared with the prior art. Of course, any product implementing the present utility model does not necessarily need to achieve all the advantages described below:

[0013] 1. In the present utility model, the sealing seat is made of plastic. The sharp corner of the valve body sealing surface is inserted into the plastic sealing seat, ensuring that the sealing seat does not shift during the opening and closing of the valve and always remains in the same position, making the internal sealing effect stable. When the sharp corner of the valve body sealing surface is inserted into the sealing seat, there is already a sealing compression amount for the sealing seat itself, and the anti-external leakage performance is better. The compression amount of the packing outside the valve stem can be reduced, so the operating torque of the valve is small.

[0014] In the present utility model, a gland is provided near the top of the main valve body on the outer surface of the valve stem, so that the packing can be compacted by the gland. When the auxiliary valve body and the main valve body are docked, a sealing washer is provided between the auxiliary valve body and the main valve body, which can improve the sealing performance at their docking place and prevent leakage. An arc-shaped cavity is formed inside the main valve body, and the inner arc surface of the arc-shaped cavity is convenient for fitting with the arc-shaped outer surface of the spherical valve core, thereby improving the sealing between their contact surfaces. At the same time, when the spherical valve core is rotated, it can also be guided by the inner arc surface of the arc-shaped cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The following drawings in the description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0016] Figure 1 is a cross-sectional perspective structure schematic diagram of a ball valve with an improved sealing structure proposed by the present utility model;

[0017] Figure 2For the present utility model Figure 1 The enlarged view of part A in

[0018] Figure 3 For the present utility model Figure 1 The enlarged view of part B in

[0019] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0020] 1. Auxiliary valve body; 2. Spherical valve core; 3. Arc-shaped cavity; 4. Sealing groove; 5. Sealing seat; 6. Sharp corner of valve body sealing surface; 7. Valve stem; 8. Packing; 9. Docking groove; 10. Main valve body; 11. Locking bolt; 12. Sealing washer; 13. gland.

[0021] It should be noted that these attached drawings and text descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Specific embodiments

[0022] Now, the present utility model will be further described in detail with reference to the attached drawings.

[0023] Embodiment 1, as Figures 1-3 shown, the present utility model provides a technical solution for a ball valve with improved sealing structure: including an auxiliary valve body 1 and a main valve body 10. An arc-shaped cavity 3 is provided near one side edge between the inner walls of the main valve body 10. A spherical valve core 2 is arranged inside the arc-shaped cavity 3. Sealing grooves 4 are provided on one side inner walls of both the arc-shaped cavity 3 and the auxiliary valve body 1. Sharp corners 6 of the valve body sealing surface are provided on one side inner walls of the two sealing grooves 4. Sealing seats 5 are arranged inside the two sealing grooves 4. The outer surfaces of one sides of the two sealing seats 5 are respectively and correspondingly attached to the outer surface of the spherical valve core 2.

[0024] The effect achieved by the entire Embodiment 1 is that the sealing seat 5 is made of plastic. The sharp corner 6 of the valve body sealing surface is stabbed into the plastic sealing seat 5, ensuring that the sealing seat 5 will not shift during the opening and closing of the valve and always remains in the same position, making the internal sealing effect stable. When the sharp corner 6 of the valve body sealing surface is stabbed into the sealing seat 5, it itself has a sealing compression amount for the sealing seat 5, and the anti-external leakage performance is better. The compression amount of the packing 8 outside the valve stem 7 can be reduced, so the operating torque of the valve is small.

[0025] Embodiment 2, as Figures 1-3As shown, the tip parts of the sharp corners 6 of the valve body sealing surface all extend into the interior of the sealing seat 5. The auxiliary valve body 1 and the main valve body 10 are engaged with each other, and the opening of the arc-shaped cavity 3 faces the side of the auxiliary valve body 1. A sealing gasket 12 is arranged between the opposite sides of the auxiliary valve body 1 and the main valve body 10. A locking bolt 11 is arranged between the auxiliary valve body 1 and the main valve body 10. A docking groove 9 is formed at the top of the spherical valve core 2. A valve stem 7 is arranged at the top of the main valve body 10. The bottom of the valve stem 7 slides through to the interior of the arc-shaped cavity 3, and the bottom of the valve stem 7 is connected to the interior of the docking groove 9. A packing 8 is filled between the outer surface of the valve stem 7 and the interior of the main valve body 10. A gland 13 is arranged at the top of the main valve body 10 between the outer surfaces of the valve stem 7. The bottom of the gland 13 is in mutual contact with the top of the packing 8.

[0026] The effect achieved by the entire Embodiment 2 is that a gland 13 is arranged on the outer surface of the valve stem 7 close to the top of the main valve body 10, so that the packing 8 can be compacted through the gland 13. When the auxiliary valve body 1 and the main valve body 10 are docked with each other, the sealing gasket 12 is arranged between the auxiliary valve body 1 and the main valve body 10, so that the sealing performance of the docking part can be improved and leakage can be prevented. An arc-shaped cavity 3 is formed inside the main valve body 10. The inner arc surface of the arc-shaped cavity 3 is convenient for fitting with the arc-shaped outer surface of the spherical valve core 2, thereby improving the seal between the contact surfaces. At the same time, when the spherical valve core 2 is rotated, it can also be guided by the inner arc surface of the arc-shaped cavity 3.

[0027] Working principle: The sealing seat 5 is made of plastic. The sharp corners 6 of the valve body sealing surface are stabbed into the interior of the plastic sealing seat 5, ensuring that the sealing seat 5 will not shift during the opening and closing of the valve and always remains in the same position, making the internal sealing effect stable. When the sharp corners 6 of the valve body sealing surface are stabbed into the sealing seat 5, there is already a sealing compression amount for the sealing seat 5 itself, and the anti-external leakage performance is better. The compression amount of the packing 8 outside the valve stem 7 can be reduced, so the operating torque of the valve is small. A gland 13 is arranged on the outer surface of the valve stem 7 close to the top of the main valve body 10, so that the packing 8 can be compacted through the gland 13. When the auxiliary valve body 1 and the main valve body 10 are docked with each other, the sealing gasket 12 is arranged between the auxiliary valve body 1 and the main valve body 10, so that the sealing performance of the docking part can be improved and leakage can be prevented. An arc-shaped cavity 3 is formed inside the main valve body 10. The inner arc surface of the arc-shaped cavity 3 is convenient for fitting with the arc-shaped outer surface of the spherical valve core 2, thereby improving the seal between the contact surfaces. At the same time, when the spherical valve core 2 is rotated, it can also be guided by the inner arc surface of the arc-shaped cavity 3.

[0028] The present invention is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, all fall within the protection scope of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A ball valve with an improved sealing structure, comprising a secondary valve body (1) and a main valve body (10), characterized in that: An arc-shaped cavity (3) is formed between the inner walls of the main valve body (10) near one side edge. A spherical valve core (2) is arranged inside the arc-shaped cavity (3). Sealing grooves (4) are formed on one side inner wall of the arc-shaped cavity (3) and one side inner wall of the sub-valve body (1). Valve body sealing surface sharp corners (6) are arranged on one side inner walls of the two sealing grooves (4). Sealing seats (5) are arranged inside the two sealing grooves (4). The outer surfaces of one sides of the two sealing seats (5) are respectively and correspondingly attached to the outer surface of the spherical valve core (2).

2. The ball valve with an improved sealing structure according to claim 1, wherein: The tip parts of the valve body sealing surface sharp corners (6) extend into the interiors of the sealing seats (5). The sub-valve body (1) and the main valve body (10) are engaged with each other, and the opening of the arc-shaped cavity (3) faces one side of the sub-valve body (1).

3. The ball valve with an improved sealing structure according to claim 1, characterized in that: A sealing washer (12) is arranged between the opposite sides of the sub-valve body (1) and the main valve body (10). Locking bolts (11) are arranged between the sub-valve body (1) and the main valve body (10).

4. A ball valve with an improved sealing structure according to claim 1, characterized in that: A docking groove (9) is formed at the top of the spherical valve core (2). A valve stem (7) is arranged at the top of the main valve body (10).

5. A ball valve with an improved sealing structure according to claim 4, characterized in that: The bottom of the valve stem (7) slides through to the inside of the arc-shaped cavity (3), and the bottom of the valve stem (7) is connected to the inside of the docking groove (9).

6. The improved ball valve with a sealed structure according to claim 5, characterized in that: A packing (8) is filled between the outer surface of the valve stem (7) and the inside of the main valve body (10). A gland (13) is arranged at the top of the main valve body (10) between the outer surfaces of the valve stem (7). The bottom of the gland (13) is attached to the top of the packing (8).

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