Ball valve seat sealing structure

Abstract

The utility model discloses a ball valve seat sealing structure, which relates to the technical field of valves, and comprises a valve seat and a ball body, the ball body is arranged on one side of the valve seat, a plastic sealing ring is arranged between the ball body and the valve seat, a first sealing element is arranged on one side of the valve seat, and the first sealing element is positioned between the ball body and the valve seat; the first sealing piece comprises a circular ring and a triangular rubber ring wrapping the circular ring, and the side portion of the triangular rubber ring is tightly attached to the side portion of the ball body and the side portion of the valve seat. A valve deck is arranged on the side, away from the ball, of the valve seat, and a second sealing piece for sealing a gap between the valve deck and the valve seat is arranged between the valve deck and the valve seat. The second sealing piece comprises a lower sealing ring arranged on the valve seat and an upper sealing ring arranged on the valve deck. Through the arrangement of the first sealing piece and the second sealing piece, a good sealing effect can be achieved, a long-time sealing effect can be achieved without periodic replacement, and the sealing device is convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a ball valve seat sealing structure. Background Art

[0002] Ball valve, the opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. The hard-sealed V-type ball valve has a strong shear force between the V-type ball core and the metal valve seat with hard alloy surfacing, which is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium in the pipeline, but also close any channel to connect the other two channels. This type of valve should generally be installed horizontally in the pipeline.

[0003] After searching, the patent document (authorization announcement number is CN209622092U) discloses a ball valve seat sealing structure, including a valve body, a valve seat body and a ball body, the valve body and the valve seat body are also provided with an oil injection channel inside, the oil injection end of the oil injection channel is provided with an oil injection nozzle, the oil outlet end of the oil injection channel is connected with an oil storage area, the oil storage area is close to the connection between the valve seat body and the ball body, the lower end of the oil storage area is connected with an oil unloading pipe, the internal thread of the oil unloading pipe is connected with a pipe cover, an O-ring is provided at the connection between the valve body and the valve seat body, the connection between the valve body and the valve seat body is stepped, the stepped connection is provided with a coil spring, the connection between the ball and the valve seat body is provided with a valve seat body sealing ring, and a hexagonal screw is also connected between the valve seat body and the valve body.

[0004] The above-mentioned ball valve seat sealing structure utilizes an oil injection channel to penetrate the entire valve body and the valve seat body, and allows the injected oil to enter the oil injection area near the ball to improve the sealing effect; however, during long-term use, it is necessary to continue to inject new oil through the oil injection nozzle so that the grease mixed with impurities can be discharged through the oil discharge pipe. This operation is relatively complicated and needs to be performed periodically.

[0005] To this end, we propose a ball valve seat sealing structure to solve the problem that the ball valve seat sealing structure in the prior art needs to be periodically oiled during use in order to ensure the sealing effect. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] The ball valve seat sealing structure in the prior art needs to continue to inject new oil through the oil injection nozzle during long-term use, so that the grease mixed with impurities can be discharged through the oil discharge pipe. This operation is relatively complicated and needs to be performed periodically.

[0008] (II) Technical solution

[0009] In order to solve the above problems, the utility model provides the following technical solutions:

[0010] A ball valve seat sealing structure comprises a valve seat and a ball, wherein: the ball is arranged at one side of the valve seat, and a plastic sealing ring is arranged between the ball and the valve seat, and a first sealing member is arranged at one side of the valve seat, and the first sealing member is located between the ball and the valve seat;

[0011] The first sealing member comprises a circular ring and a triangular rubber ring wrapped around the outside of the circular ring, and the side portions of the triangular rubber ring are respectively tightly fitted with the ball and the side portions of the valve seat.

[0012] As a further solution of the utility model: a valve cover is arranged on the side of the valve seat away from the sphere, and a second sealing member for sealing the gap between the valve cover and the valve seat is arranged between the valve cover and the valve seat.

[0013] As a further solution of the utility model: the second sealing member includes a lower sealing ring arranged on the valve seat and an upper sealing ring arranged on the valve cover, and the upper sealing ring is in contact with one side of the lower sealing ring.

[0014] As a further solution of the utility model: a first inclined surface and a second inclined surface are respectively provided on one side where the upper sealing ring and the lower sealing ring are in contact with each other, and the first inclined surface is pressed against the second inclined surface.

[0015] As a further solution of the utility model: a telescopic rod is arranged between the valve seat and the valve cover, and a spring is sleeved on the telescopic rod, and two ends of the spring are fixedly connected to the valve seat and the valve cover respectively.

[0016] As a further solution of the utility model: the outer wall of the valve seat is coated with a metal hardening coating.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. When the sealing structure of the present application is used for operation, a metal hardening coating is sprayed or spray-welded on the valve seat, a triangular rubber ring and a plastic sealing ring are inserted into the valve seat, an upper sealing ring is assembled on the valve cover, a lower sealing ring is assembled on the valve seat, a telescopic rod and a spring are installed on the valve cover, and then the valve seat is installed into the valve cover. Under normal circumstances, the triangular rubber ring and the ball are sealed in a close relationship. By setting the triangular rubber ring, the deformation of the triangular rubber ring can well seal the gap between the ball and the valve seat. At the same time, due to the presence of the circular ring, the circular ring can be made of stainless steel, so that the triangular rubber ring will not be greatly deformed.

[0020] 2. By utilizing the mutual fit of the upper sealing ring and the lower sealing ring, the gap between the valve cover and the valve seat can be sealed; the utility model can achieve a good sealing effect through the arrangement of the first sealing member and the second sealing member, and can achieve a long-term sealing effect without the need for periodic replacement, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 3 This is a schematic diagram of the overall structure of the first sealing member in the utility model;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the second sealing member in the utility model. Figure 1 ;

[0026] Figure 5 This is a schematic diagram of the cross-sectional structure of the second sealing member in the utility model. Figure 2 .

[0027] In the figure: 1. valve seat; 2. sphere; 3. plastic sealing ring; 4. circular ring; 5. triangular rubber ring; 6. valve cover; 7. lower sealing ring; 8. upper sealing ring; 9. first inclined plane; 10. second inclined plane; 11. telescopic rod; 12. spring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1:

[0030] like Figure 1-Figure 3 As shown, a ball valve seat sealing structure includes a valve seat 1 and a ball 2, wherein: the ball 2 is arranged at one side of the valve seat 1, and a plastic sealing ring 3 is arranged between the ball 2 and the valve seat 1, a first sealing member is arranged at one side of the valve seat 1, and the first sealing member is located between the ball 2 and the valve seat 1, and the first sealing member can be used to perform preliminary sealing and isolation between the ball 2 and the valve seat 1.

[0031] Specifically, the first sealing member includes a circular ring 4 and a triangular rubber ring 5 wrapped around the circular ring 4, and the sides of the triangular rubber ring 5 are respectively tightly fitted with the sides of the ball 2 and the valve seat 1. Through the arrangement of the triangular rubber ring 5, the deformation of the triangular rubber ring 5 can well seal the gap between the ball 2 and the valve seat 1. At the same time, due to the presence of the circular ring 4, the circular ring 4 can be made of stainless steel, so that the triangular rubber ring 5 will not be greatly deformed.

[0032] A telescopic rod 11 is arranged between the valve seat 1 and the valve cover 6 , and a spring 12 is sleeved on the telescopic rod 11 , and two ends of the spring 12 are fixedly connected to the valve seat 1 and the valve cover 6 respectively.

[0033] In order to further improve the sealing effect, a metal hardening coating (not shown in the figure) is coated on the outer wall of the valve seat 1. The metal hardening coating can be provided by spraying or spray welding.

[0034] Embodiment 2:

[0035] This embodiment is different from the first embodiment in that a valve cover 6 is provided on the side of the valve seat 1 away from the sphere 2, and a second sealing member is provided between the valve cover 6 and the valve seat 1 for sealing the gap therebetween. The second sealing member can be used to achieve a good sealing between the valve cover 6 and the valve seat 1.

[0036] Specifically, the second sealing member includes a lower sealing ring 7 disposed on the valve seat 1 and an upper sealing ring 8 disposed on the valve cover 6, and the upper sealing ring 8 is fitted with one side of the lower sealing ring 7. After the assembly is completed, the gap between the valve cover 6 and the valve seat 1 can be sealed by the mutual fitting of the upper sealing ring 8 and the lower sealing ring 7.

[0037] like Figure 4-Figure 5 As shown, in order to better achieve the sealing effect between the upper sealing ring 8 and the lower sealing ring 7, a first bevel 9 and a second bevel 10 can be respectively provided on the side where the upper sealing ring 8 and the lower sealing ring 7 are in contact with each other, and the first bevel 9 and the second bevel 10 are pressed and fitted. By setting the first bevel 9 and the second bevel 10, the contact area between the upper sealing ring 8 and the lower sealing ring 7 can be increased, thereby improving the sealing effect between the upper sealing ring 8 and the lower sealing ring 7.

[0038] Working principle of the utility model: when the sealing structure of the present application is used for work, the metal hardening coating is sprayed or spray-welded on the valve seat 1, the triangular rubber ring 5 and the plastic sealing ring 3 are inserted into the valve seat 1, the upper sealing ring 8 is assembled on the valve cover 6, the lower sealing ring 7 is assembled on the valve seat 1, the telescopic rod 11 and the spring 12 are installed on the valve cover 6, and then the valve seat 1 is installed in the valve cover 6. Under normal conditions of the valve, the triangular rubber ring 5 and the ball 2 are sealed in a close relationship. Through the setting of the triangular rubber ring 5, the deformation of the triangular rubber ring 5 can be used to well block the gap between the ball 2 and the valve seat 1. At the same time, due to the existence of the circular ring 4, the circular ring 4 can be made of stainless steel, so that the triangular rubber ring 5 will not be greatly deformed. At the same time, the mutual fit of the upper sealing ring 8 and the lower sealing ring 7 can be used to block and seal the gap between the valve cover 6 and the valve seat 1. It does not need to be replaced periodically, and can achieve a long-term sealing effect, which is convenient to use.

[0039] It should be noted that the parts that are not described in detail in this embodiment are the same as the conventional technical means in the prior art. In order to avoid cumbersome writing, this article does not elaborate on this part.

[0040] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A ball valve seat sealing structure, characterized in that: The valve seat (1) comprises a ball (2), wherein the ball (2) is arranged at one side of the valve seat (1), and a plastic sealing ring (3) is arranged between the ball (2) and the valve seat (1); a first sealing member is arranged at one side of the valve seat (1), and the first sealing member is located between the ball (2) and the valve seat (1); The first sealing member comprises a circular ring (4) and a triangular rubber ring (5) covering the outside of the circular ring (4), and the side of the triangular rubber ring (5) is tightly fitted with the side of the ball (2) and the side of the valve seat (1); A valve cover (6) is provided on the side of the valve seat (1) away from the sphere (2), and a second sealing member for sealing a gap between the valve cover (6) and the valve seat (1) is provided between the valve cover (6) and the valve seat (1); The second sealing member comprises a lower sealing ring (7) arranged on the valve seat (1) and an upper sealing ring (8) arranged on the valve cover (6), and the upper sealing ring (8) is in contact with one side of the lower sealing ring (7).

2. A ball valve seat sealing structure according to claim 1, characterized in that: A first inclined surface (9) and a second inclined surface (10) are respectively provided on the side where the upper sealing ring (8) and the lower sealing ring (7) are in contact with each other, and the first inclined surface (9) and the second inclined surface (10) are pressed and contacted with each other.

3. A ball valve seat sealing structure according to claim 2, characterized in that: A telescopic rod (11) is arranged between the valve seat (1) and the valve cover (6), and a spring (12) is sleeved on the telescopic rod (11), and two ends of the spring (12) are respectively fixedly connected to the valve seat (1) and the valve cover (6).

4. A ball valve seat sealing structure according to claim 3, characterized in that: The outer wall of the valve seat (1) is coated with a metal hardening coating.

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