Rubber sealing structure for ball valve

Abstract

The utility model belongs to the technical field of ball valve sealing, and discloses a rubber sealing structure for a ball valve. The rubber sealing structure for the ball valve comprises a valve seat, a rubber sealing ring and a pressing ring, the valve seat is arranged on a valve body in a sleeving mode, a sealing groove is formed in the position, sealed with a ball body, of the side wall of the valve seat, the rubber sealing ring is installed in the sealing groove, the cross section of the rubber sealing ring is triangular, and a sealing ring is arranged on the cross section of the rubber sealing ring. The right angle of the triangle is an arc angle, the formed arc surface is tightly attached to the contact surface of the ball body to form sealing, sawteeth or protrusions are continuously arranged on the two right-angle sides of the triangle, and tooth grooves or grooves are correspondingly formed in one side wall of the pressing ring and one groove wall of the sealing groove respectively. The pressing ring and the sealing groove are embedded into the two right-angle sides of the triangle into a whole through a sawtooth-shaped or concave-convex matching structure, and the pressing ring presses the rubber sealing ring and fixes the position of the rubber sealing ring. According to the sealing structure, the two contact planes of the rubber sealing ring and the sealing groove and the pressing ring are changed into the sawtooth faces or the concave-convex faces, the rubber sealing ring can be effectively prevented from being extruded out by high-pressure gas or liquid media, and then the rubber sealing faces are prevented from being sheared and damaged in the twisting process of the valve ball body.

Description

Technical Field

[0001] The utility model belongs to the technical field of ball valve sealing, and particularly relates to a rubber sealing structure for a ball valve. Background Technique

[0002] With the gradual wide promotion and popularization of natural gas, a clean energy source, in the industrial and civil fields in China, the oil and gas industry has been developing continuously and rapidly. The excavation and pipeline transportation projects have become important links in the construction. Among them, a large number of valves that control the passage and blockage of media are used. Especially, the quality and stability of large-size high-pressure ball valves in long-distance pipeline transportation are particularly important. The main seal of a ball valve refers to the seal between the ball and the valve body, and this seal is mainly achieved by a sealing seat, and common sealing rings and support rings are arranged on the ball valve seat. For example, the patent document 1 CN204420181U discloses a floating soft-sealing ball valve triangular ring seat mechanism. This seat includes a triangular ring seat groove, a triangular ring seat and a parallel support ring. The solution in this document adopts a regular isosceles triangle rubber sealing ring structure. However, under the action of higher pressure, the triangular rubber sealing ring in such a structure is prone to deformation, and thus may be extruded by high-pressure gas or liquid. Or during the opening and closing process of the valve, the rubber triangular sealing surface is easily sheared and damaged, and the high-pressure sealing effect cannot be achieved. Content of the Utility Model

[0003] In order to solve the technical problem that the triangular rubber sealing ring in the prior art is prone to deformation under high pressure and thus may be extruded by high-pressure gas or liquid, the utility model provides a rubber sealing structure for a ball valve.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A rubber sealing structure for a ball valve, which includes a seat, a rubber sealing ring and a pressing ring. The seat is sleeved on the valve body, and a sealing groove is opened on the side wall of the seat at the sealing position with the ball. The rubber sealing ring is installed in the sealing groove. The cross-section of the rubber sealing ring is triangular. On the cross-section of the rubber sealing ring, the right angle of the triangle is an arc angle, and the formed arc surface is closely attached to the contact surface of the ball to form a seal. On both right-angle sides of the triangle, sawteeth or protrusions are continuously arranged. On one side wall of the pressing ring and one groove wall of the sealing groove, tooth grooves or grooves are respectively opened. The pressing ring and the sealing groove are respectively embedded into one body with both right-angle sides of the triangle through a serrated or concave-convex matching structure. The pressing ring presses the rubber sealing ring and fixes its position.

[0006] Furthermore, a support ring is further arranged on the side wall of the seat.

[0007] Furthermore, on the cross-section of the rubber sealing ring, both acute angles of the triangle are arc angles, and the inclined plane formed by the combination of the two arc surfaces and the hypotenuse of the triangle is in close contact with the bottom groove wall surface of the sealing groove to form a seal.

[0008] Furthermore, the hardness of the rubber sealing ring is 95 Shore or above.

[0009] The rubber sealing ring of the present application can be made of nitrile rubber, hydrogenated nitrile rubber, fluororubber, tetrapropylene fluororubber or perfluoroether rubber materials.

[0010] Compared with the prior art, the present application provides a rubber sealing structure for a ball valve. The cross-section of the rubber sealing ring is also triangular. The pressing ring and the sealing groove of the present application are respectively integrated with the two right-angled sides of the triangle through a serrated or concave-convex mating structure. The above structure can change the two contact planes of the rubber sealing ring with the sealing groove and the pressing ring into serrated surfaces or concave-convex surfaces, so that the rubber sealing ring, the pressing ring and the sealing groove form a good mutual nesting, effectively preventing the rubber sealing ring from being extruded by high-pressure gas or liquid medium, and further avoiding shear damage to the rubber sealing surface during the torsion of the valve ball, ensuring the sealing effect of the rubber sealing ring.

[0011] Secondly, on the premise of ensuring that the rubber sealing ring is not extruded by high-pressure gas or liquid medium, the present application does not damage the sealing effect of the rubber sealing ring. Specifically, on the cross-section of the rubber sealing ring, the present application arranges the mutually nested serrated or concave-convex structures on the right-angled sides of the triangle, thus avoiding the right-angled corner of the triangle and the relative hypotenuse position that need to be strictly sealed, and thus not affecting the strict sealing between the arc angle at the right-angled corner of the triangle and the sphere, and between the arc angles at the two acute angles of the triangle and the hypotenuse and the bottom groove of the sealing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is the overall structure schematic diagram of the ball valve and the rubber sealing structure provided by the present utility model;

[0013] Figure 2 is a structure schematic diagram of the rubber sealing ring provided by the present utility model;

[0014] Figure 3 is another structure schematic diagram of the rubber sealing ring provided by the present utility model.

[0015] Wherein, Figures 1 - 3 in:

[0016] 1, ball; 2, valve body; 3, valve seat; 4, sealing groove; 5, rubber sealing ring; 6, pressing ring; 7, support ring; 8, serration; 9, tooth groove; 10, protrusion; 11, groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "side", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the position or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0019] Combined with Figures 1 - 3 As shown, the present invention provides a rubber sealing structure for a ball valve, which includes a valve seat 3, a rubber sealing ring 5 and a pressing ring 6. The valve seat 3 is sleeved on the valve body 2, and a sealing groove 4 is opened on the side wall of the valve seat 3 at the sealing part with the ball 1. The rubber sealing ring 5 is installed in the sealing groove 4. The cross-section of the rubber sealing ring 5 is triangular. On the cross-section of the rubber sealing ring, the right angle of the triangle is an arc angle, and the formed arc surface is in close contact with the contact surface of the ball 1 to form a seal. On both right-angled sides of the triangle, sawteeth 8 or protrusions 10 are continuously arranged. On one side wall of the pressing ring 6 and one groove wall of the sealing groove 4, tooth grooves 9 or grooves 11 are respectively opened. The pressing ring 6 and the sealing groove 4 are respectively embedded and integrated with the two right-angled sides of the triangle through a serrated or concave-convex matching structure. The pressing ring 6 presses the rubber sealing ring 5 and fixes its position.

[0020] As Figure 2 As shown, in one embodiment, on the cross-section of the rubber sealing ring, sawteeth 8 are provided on the two right-angled sides of the triangle in the present application, and tooth grooves 9 are respectively opened on one side wall of the pressing ring 6 and one groove wall of the sealing groove 4. The sawteeth 8 on one right-angled side are meshed with the tooth groove 9 on one side wall of the pressing ring 6, and the position of the rubber sealing ring 5 is fixed by pressing the rubber sealing ring 5 with the pressing ring 6. The sawteeth 8 on the other right-angled side are meshed with the tooth groove 9 on one groove wall of the sealing groove 4. The pressing ring 6 and the sealing groove 4 are respectively embedded and integrated with the two right-angled sides of the triangle through a serrated structure.

[0021] As Figure 3As shown, in another embodiment, on the cross-section of the rubber sealing ring, the present application is provided with protrusions 10 on the two right-angled sides of the triangle. On one side wall of the pressing ring 6 and one groove wall of the sealing groove 4, grooves 11 are respectively formed. The protrusion 10 on one right-angled side cooperates with the groove 11 on one side wall of the pressing ring 6, and the pressing ring 6 presses the rubber sealing ring 5 to fix its position. The protrusion 10 on the other right-angled side cooperates with the groove 11 on one groove wall of the sealing groove 4. The pressing ring 6 and the sealing groove 4 are respectively integrally embedded with the two right-angled sides of the triangle through a concave-convex matching structure.

[0022] The sawteeth 8 or protrusions 10 formed on the two right-angled sides of the triangle cooperate with the corresponding tooth grooves 9 or grooves 11 on the pressing ring 6 and the sealing groove 4 respectively and are integrally embedded. In this way, the two contact planes of the rubber sealing ring 5 with the sealing groove 4 and the pressing ring 6 can be changed into sawtooth surfaces or concave-convex surfaces, so that the rubber sealing ring 5, the pressing ring 6 and the sealing groove 4 form a good mutual nesting, which can effectively prevent the rubber sealing ring from being extruded by high-pressure gas or liquid medium, and further avoid the shear damage of the rubber sealing surface during the torsion process of the valve ball 1, and also ensure the sealing effect of the rubber sealing ring.

[0023] In addition, in a preferred embodiment, the present application arranges the sawteeth 8 and the protrusions 10 on the right-angled sides of the triangle of the cross-section of the rubber sealing ring 5, and arranges the tooth grooves 9 and the grooves 11 on the pressing ring 6 and the sealing groove 4. In this way, it is more convenient for the processing of metal parts, and it is also beneficial to the installation of the rubber sealing ring 5 and the pressing ring 6 in the groove. During installation, the sawtooth-shaped or concave-convex matching structure can be better embedded into one body to achieve a better sealing effect.

[0024] In order to enable the rubber sealing ring to achieve a better sealing effect, on the cross-section of the rubber sealing ring, generally there are two places that need to be completely sealed. One is at the right angle of the triangle, and the other is at the hypotenuse position of the triangle. Therefore, the present application arranges the sawteeth 8 or protrusions 10 on the two right-angled sides of the triangle, so as to avoid the right angle and the hypotenuse positions that need to be sealed. Further, arc angles with arc transitions are arranged at the two acute angles and the right angle of the triangle. The two arc surfaces formed by the arc angles and the hypotenuse of the triangle form an inclined surface that closely fits with the bottom groove wall surface of the sealing groove 4 to form a seal. The three angles of the triangle in the present application are all arc angles with smooth transitions, which can further improve the sealing effect of the sealing ring.

[0025] In other specific embodiments, a support ring 7 is further provided on the side wall of the valve seat 3. The hardness of the rubber sealing ring 5 is 95 Shore or above. The rubber sealing ring 5 in the present application can be prepared from common rubber materials in the art. The present application preferably adopts nitrile rubber, hydrogenated nitrile rubber, fluororubber, tetrapropyl fluororubber or perfluoroether rubber materials.

[0026] The preferred embodiments of the present utility model disclosed above are only used to help illustrate the present utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the present utility model to only the specific implementation manners. Obviously, according to the content of this specification, many modifications and variations can be made. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present utility model, so that those skilled in the relevant technical field can well understand and utilize the present utility model. The present utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A rubber sealing structure for a ball valve, comprising a valve seat, a rubber sealing ring and a pressure ring, wherein the valve seat is sleeved on the valve body, a sealing groove is provided on the side wall of the valve seat where the valve seat seals with the ball, and the rubber sealing ring is installed in the sealing groove, characterized in that: The cross section of the rubber sealing ring is triangular. On the cross section of the rubber sealing ring, the right angle of the triangle is an arc angle. The arc surface formed by the triangle fits tightly with the contact surface of the sphere to form a seal. Saw teeth or protrusions are continuously arranged on the two right-angled sides of the triangle. Saw teeth or grooves are correspondingly opened on one side wall of the pressure ring and one groove wall of the sealing groove. The pressure ring and the sealing groove are respectively embedded into one with the two right-angled sides of the triangle through a serrated or concave-convex matching structure. The pressure ring presses the rubber sealing ring and fixes its position.

2. The rubber sealing structure for a ball valve according to claim 1, characterized in that: A supporting ring is also provided on the side wall of the valve seat.

3. The rubber sealing structure for a ball valve according to claim 1, characterized in that: On the cross section of the rubber sealing ring, the two acute angles of the triangle are arc angles, and the inclined surface formed by the two arc surfaces and the hypotenuse of the triangle fits tightly with the bottom groove wall surface of the sealing groove to form a seal.

4. The rubber sealing structure for a ball valve according to claim 1, characterized in that: The hardness of the rubber sealing ring is 95 Shore or above.

5. The rubber sealing structure for a ball valve according to claim 1 or 4, characterized in that: The rubber sealing ring is made of nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, tetrapropylene fluorine rubber or perfluoroether rubber.

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