Auxiliary sealing valve

Abstract

The utility model discloses an auxiliary sealing valve, which relates to the technical field of sealing valves, and comprises a valve body, a side body, a ball body and a valve rod, and a valve rod sealing assembly is arranged between the valve rod and the valve body; a triple sealing structure is arranged on the contact surface of the valve body and the side body, the triple sealing structure comprises a rhombic sealing cavity, an auxiliary sealing cavity and a special-shaped sealing cavity, a polytetrafluoroethylene plastic gasket is arranged in the rhombic sealing cavity, a metal graphite winding gasket is arranged in the auxiliary sealing cavity, and the special-shaped sealing cavity is connected with the rhombic sealing cavity. A special-shaped sealing gasket is arranged in the special-shaped sealing cavity, and arc-shaped protrusions are arranged on the bottom face and the top face of the inner wall of the special-shaped sealing cavity. According to the utility model, the advantages of the PTFE plastic gasket and the metal graphite winding gasket are combined, the cleanness is ensured, the alternation of high temperature and low temperature can be borne, and when the PTFE plastic gasket and the metal graphite winding gasket fail in sealing, the special-shaped sealing cavity and the special-shaped sealing gasket can play a role in auxiliary sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sealing valve technical field especially auxiliary sealing valve. BACKGROUND

[0002] The flange ball valve is widely used in production and life, and application fields involve medicine, petroleum, chemical industry, natural gas and other industries, because of standard flange connecting hole design, so installation and use are very convenient. In addition, the valve seat adopts elastic sealing structure, and sealing is reliable, and opening and closing are easy. Moreover, fireproof structure is arranged, if fire occurs, reliable operation and good sealing can still be realized.

[0003] Most of the flange ball valves on the market have only one gasket seal at the joint of the valve body and the side body, which is usually a fluoroplastic gasket or a metal winding gasket. When there is only a fluoroplastic gasket, the valve has limited high-temperature and low-temperature resistance. When there is only a metal graphite winding gasket, the valve has improved high-temperature and low-temperature resistance, but there is a risk of loss of control of valve cleanliness, so there are certain limitations in using only a single sealing structure. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing an auxiliary sealing valve to solve the problem of limitations of the single sealing structure of the flange ball valve using only a fluoroplastic gasket or a metal winding gasket.

[0005] The utility model adopts the following technical scheme:

[0006] The auxiliary sealing valve comprises a valve body, a side body, a ball body and a valve rod. The valve body and the side body are connected by bolts. The ball body is arranged between the valve body and the side body. The ball body is in rotational sealing cooperation with the valve body and the side body. The upper end of the ball body is fixedly connected with the valve rod. The valve rod passes through the valve body, and a valve rod sealing assembly is arranged between the valve rod and the valve body. A triple sealing structure is arranged on the contact surface of the valve body and the side body. The triple sealing structure comprises a rhombic sealing cavity, an auxiliary sealing cavity and a special-shaped sealing cavity.

[0007] The rhombic sealing cavity is in the shape of a rhombus. A fluoroplastic gasket is sealingly arranged in the rhombic sealing cavity. A metal graphite winding gasket is sealingly arranged in the auxiliary sealing cavity. A special-shaped sealing gasket is sealingly arranged in the special-shaped sealing cavity. The inner wall bottom surface and the top surface of the special-shaped sealing cavity are both provided with arc protrusions.

[0008] Further, the valve body is provided with a first gasket contact surface with an opening angle, the side body is provided with a second gasket contact surface with an opening angle, the first gasket contact surface and the second gasket contact surface form the rhombic sealing cavity, and the cross section of the PTFE gasket is provided as a rhombic structure matched with the inner wall of the rhombic sealing cavity.

[0009] The valve body is provided with a third gasket contact surface with a right angle, the side body is provided with a fourth gasket contact surface with a right angle, the third gasket contact surface and the fourth gasket contact surface form the auxiliary sealing cavity, and the cross section of the metal graphite winding gasket is provided as a rectangular structure matched with the inner wall of the auxiliary sealing cavity.

[0010] The valve body is provided with a fifth gasket contact surface, the side body is provided with a sixth gasket contact surface, the fifth gasket contact surface and the sixth gasket contact surface form the special-shaped sealing cavity and the arc-shaped protrusion, and the abutting positions of the fifth gasket contact surface and the sixth gasket contact surface are located at the vertex position of the arc-shaped protrusion, and the arc-shaped protrusion of the inner wall bottom surface and the top surface of the special-shaped sealing cavity are opposite.

[0011] Further, the valve stem sealing assembly comprises a special-shaped thrust gasket, a packing and a compression ring; the bottom of the valve stem is provided with a conical boss, the special-shaped thrust gasket is sealingly arranged between the conical boss and the valve body; the packing is arranged between the valve stem and the valve body, and the compression ring is tightly buckled above the packing and sealingly arranged between the valve stem and the valve body; the upper end of the valve stem is threadedly connected with a hexagon nut, and the hexagon nut is in pressure tight cooperation with the compression ring.

[0012] Further, the hexagon nut and the compression ring are provided with double-layer butterfly elastic sheets therebetween.

[0013] Further, the top of the valve stem is provided with a handle.

[0014] Still further, both sides of the ball body are provided with valve seats, and the valve seats are provided with elastic grooves away from the ball body.

[0015] Compared with the prior art, the beneficial technical effects of the utility model are:

[0016] The utility model combines the advantages of the PTFE gasket and the metal graphite winding gasket, can ensure cleaning and withstand high-low temperature alternation, and when the PTFE gasket and the metal graphite winding gasket both fail to seal, the special-shaped sealing cavity and the special-shaped sealing gasket can play an auxiliary sealing role. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in connection with the drawings.

[0018] Figure 1 Structure diagram of auxiliary sealing valve of the utility model;

[0019] Figure 2 Structure diagram of triple sealing structure in auxiliary sealing valve of the utility model;

[0020] Figure 3 Structure diagram of triple sealing structure in auxiliary sealing valve of the utility model after removing sealing gasket;

[0021] Figure 4 Structure diagram of three sealing gaskets of triple sealing structure in auxiliary sealing valve of the utility model;

[0022] Figure 5 Structure diagram of valve seat in auxiliary sealing valve of the utility model;

[0023] Figure 6 Structure diagram of valve rod sealing assembly in auxiliary sealing valve of the utility model;

[0024] Figure 7 Structure diagram of special-shaped thrust washer in auxiliary sealing valve of the utility model;

[0025] Figure 8 Front view of valve rod and ball in auxiliary sealing valve of the utility model;

[0026] Figure 9 Side view of valve rod and ball in auxiliary sealing valve of the utility model;

[0027] Figure 10 Structure diagram of double-layer butterfly-shaped elastic sheet in auxiliary sealing valve of the utility model;

[0028] Figure 11 Change diagram of polytetrafluoroethylene gasket when valve body temperature rises in auxiliary sealing valve of the utility model;

[0029] Figure 12 Change diagram of polytetrafluoroethylene gasket when valve body temperature reduces in auxiliary sealing valve of the utility model.

[0030] Explanation of reference signs: 1, valve body; 1-1, first gasket contact surface; 1-2, third gasket contact surface; 1-3, fifth gasket contact surface; 2, side body; 2-1, second gasket contact surface; 2-2, fourth gasket contact surface; 2-3, sixth gasket contact surface; 3, ball body; 4, valve stem; 4-1, conical boss; 5, valve stem sealing assembly; 5-1, special thrust washer; 5-2, packing; 5-3, compression ring; 6, valve seat; 6-1, elastic groove; 7, triple sealing structure; 7-1, rhombic sealing cavity; 7-2, auxiliary sealing cavity; 7-3, special sealing cavity; 7-4, fluoroplastic gasket; 7-5, metal graphite wound gasket; 7-6, special sealing gasket; 7-7, arc-shaped protrusion; 8, hexagonal nut; 9, double-layer butterfly elastic sheet; 10, handle; 11, anti-loosening washer. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects of the utility model to be solved more clearly, the utility model will be further described in detail below in combination with the drawings and examples.

[0032] As shown in the drawings, Figure 1 The utility model discloses a kind of auxiliary sealing valves, including valve body 1, side body 2, ball body 3 and valve stem 4, valve body 1 is connected with side body 2 by bolt, ball body 3 is arranged between valve body 1 and side body 2, ball body 3 is rotationally sealed with valve body 1, side body 2, the upper end of ball body 3 is fixedly connected with valve stem 4, valve stem 4 passes through valve body 1, and valve stem sealing assembly 5 is arranged between valve stem 4 and valve body 1. Triple sealing structure 7 is arranged on the contact surface of valve body 1 and side body 2.

[0033] As shown in the drawings, Figures 2 to 4 Triple sealing structure 7 includes rhombic sealing cavity 7-1, auxiliary sealing cavity 7-2 and special sealing cavity 7-3, special sealing cavity 7-3 is sealingly provided with special sealing gasket 7-6, and the inner wall bottom surface and top surface of special sealing cavity 7-3 are provided with arc-shaped protrusion 7-7. Rhombic sealing cavity 7-1 is rhombic structure, and fluoroplastic gasket 7-4 is sealingly provided in rhombic sealing cavity 7-1. Metal graphite wound gasket 7-5 is sealingly provided in auxiliary sealing cavity 7-2.

[0034] Specifically, first gasket contact surface 1-1 with opening angle is arranged on valve body 1, second gasket contact surface 2-1 with opening angle is arranged on side body 2, first gasket contact surface 1-1 and second gasket contact surface 2-1 are the same shape, and first gasket contact surface 1-1 and second gasket contact surface 2-1 form rhombic sealing cavity 7-1, and the cross section of fluoroplastic gasket 7-4 is set as rhombic structure matched with the inner wall of rhombic sealing cavity 7-1.

[0035] The valve body 1 is provided with a third gasket contact surface 1-2 with a right angle, the side body 2 is provided with a fourth gasket contact surface 2-2 with a right angle, the third gasket contact surface 1-2 is the same shape as the fourth gasket contact surface 2-2, the third gasket contact surface 1-2 and the fourth gasket contact surface 2-2 form an auxiliary sealing cavity 7-2, and the cross section of the metal graphite winding gasket 7-5 is rectangular structure matched with the inner wall of the auxiliary sealing cavity 7-2.

[0036] The valve body 1 is provided with a fifth gasket contact surface 1-3, the side body 2 is provided with a sixth gasket contact surface 2-3, the fifth gasket contact surface 1-3 and the sixth gasket contact surface 2-3 form a special-shaped sealing cavity 7-3 and an arc-shaped protrusion 7-7, and the abutting position of the fifth gasket contact surface 1-3 and the sixth gasket contact surface 2-3 is located at the vertex position of the arc-shaped protrusion 7-7, and the arc-shaped protrusion 7-7 of the inner wall bottom surface and the top surface of the special-shaped sealing cavity 7-3 faces opposite. Two arc-shaped protrusions 7-7 combined and facing opposite, on the one hand, can better fix the position of the special-shaped sealing gasket 7-6, and will not easily cause left and right deviation. On the other hand, if the tetrafluoro plastic gasket 7-4 and the metal graphite winding gasket 7-5 fail to seal, causing cracks in the rhombic sealing cavity 7-1 and the auxiliary sealing cavity 7-2 and causing medium leakage, the special-shaped sealing gasket 7-6 will have a third resealing effect. If the special-shaped sealing gasket 7-6 also fails to seal and cracks, the concave space formed between the arc-shaped protrusion 7-7 and the fifth gasket contact surface 1-3 and the sixth gasket contact surface 2-3 can also store a certain amount of leaked medium, serving as a fourth auxiliary sealing function. In the embodiment, the special-shaped sealing gasket 7-6 is made of rubber material to facilitate installation.

[0037] As shown in Figures 5 to 10 The valve stem sealing assembly 5 includes a special-shaped thrust washer 5-1, a packing 5-2 and a compression ring 5-3. The bottom of the valve stem 4 is provided with a conical boss 4-1, and the special-shaped thrust washer 5-1 is sealingly arranged between the conical boss 4-1 and the valve body 1. The packing 5-2 is arranged between the valve stem 4 and the valve body 1, and the compression ring 5-3 is tightly buckled above the packing 5-2 and sealingly arranged between the valve stem 4 and the valve body 1. The hexagonal nut 8 is threadedly connected to the upper end of the valve stem 4, and the hexagonal nut 8 is tightly matched with the compression ring 5-3. The combination of the special-shaped thrust washer 5-1, the packing 5-2 and the compression ring 5-3 greatly improves the sealing effect.

[0038] A double-layer butterfly spring 9 is arranged between the hexagonal nut 8 and the compression ring 5-3. The double-layer butterfly spring 9 keeps the packing 5-2 under constant compression force, and leakage does not occur.

[0039] Two sides of the ball 3 are provided with valve seats 6, and the side of the valve seats 6 away from the ball 3 is provided with an elastic groove 6-1. The elastic groove 6-1 can increase the elasticity of the sealing surface of the valve seat 6, reduce the sealing pre-tightening force, so that the valve operating torque is small, and the sealing performance is better.

[0040] In the embodiment, the top of the valve stem 4 is provided with a handle 10, the handle 10 is fastened on the valve stem 4 through a hexagonal nut 8, and a lock washer 11 is arranged between the handle 10 and the lower hexagonal nut 8.

[0041] As shown in Figure 11 When the temperature of the valve rises, the PTFE gasket 7-4 expands to the side of the rhombic sealing cavity 7-1 away from the ball 3 and is extruded, so that the sealing effect is enhanced; as shown in Figure 12 When the temperature of the valve decreases, the PTFE gasket 7-4 shrinks to the side of the rhombic sealing cavity 7-1 towards the ball 3 and is extruded, so that the sealing effect is also enhanced.

[0042] The working principle of the utility model is as follows:

[0043] In the utility model, the valve body 1 and the side body 2 are connected through a bolt assembly, and the advantages of the PTFE gasket 7-4 and the metal graphite winding gasket 7-5 are combined, so that the cleanliness is ensured and the high-low temperature alternation can be borne. At the same time, if the PTFE gasket 7-4 and the metal graphite winding gasket 7-5 are sealed and fail to produce a gap in the rhombic sealing cavity 7-1 and the auxiliary sealing cavity 7-2, and cause the medium to leak out, the special-shaped sealing gasket 7-6 plays a third sealing effect, and if the special-shaped sealing gasket 7-6 also fails to seal and produces a crack, the concave cavity space formed between the arc-shaped protrusion 7-7 and the fifth gasket contact surface 1-3 and the sixth gasket contact surface 2-3 can also store a certain amount of leaked medium, and plays a fourth auxiliary sealing role.

[0044] The above-described embodiments are only used to describe the preferred modes of the utility model, and do not limit the scope of the utility model, and various deformations and improvements of the technical solutions of the utility model made by those skilled in the art without departing from the design spirit of the utility model should fall within the protection scope determined by the claims of the utility model.

Claims

1. An auxiliary sealing valve, comprising a valve body (1), a side body (2), a ball body (3) and a valve rod (4), the valve body (1) is connected with the side body (2) by bolts, the ball body (3) is arranged between the valve body (1) and the side body (2), the ball body (3) is in rotating sealing fit with the valve body (1) and the side body (2), the upper end of the ball body (3) is fixedly connected with the valve rod (4), the valve rod (4) passes through the valve body (1), and a valve rod sealing assembly (5) is arranged between the valve rod (4) and the valve body (1); characterized in that: The contact surface of the valve body (1) and the side body (2) is provided with a triple sealing structure (7), which comprises a rhombic sealing cavity (7-1), an auxiliary sealing cavity (7-2) and a special-shaped sealing cavity (7-3) ； The rhombic sealing cavity (7-1) is in a rhombic structure, a PTFE gasket (7-4) is sealingly arranged in the rhombic sealing cavity (7-1), a metal graphite winding gasket (7-5) is sealingly arranged in the auxiliary sealing cavity (7-2), and a special-shaped sealing gasket (7-6) is sealingly arranged in the special-shaped sealing cavity (7-3), and the inner wall bottom surface and the top surface of the special-shaped sealing cavity (7-3) are both provided with an arc-shaped protrusion (7-7).

2. The auxiliary seal valve of claim 1, wherein: The valve body (1) is provided with a first gasket contact surface (1-1) with an opening angle, the side body (2) is provided with a second gasket contact surface (2-1) with an opening angle, the first gasket contact surface (1-1) and the second gasket contact surface (2-1) form the rhombic sealing cavity (7-1), and the cross section of the PTFE gasket (7-4) is in a rhombic structure matched with the inner wall of the rhombic sealing cavity (7-1); The valve body (1) is provided with a third gasket contact surface (1-2) with a right angle, the side body (2) is provided with a fourth gasket contact surface (2-2) with a right angle, the third gasket contact surface (1-2) and the fourth gasket contact surface (2-2) form the auxiliary sealing cavity (7-2), and the cross section of the metal graphite winding gasket (7-5) is in a rectangular structure matched with the inner wall of the auxiliary sealing cavity (7-2); The valve body (1) is provided with a fifth gasket contact surface (1-3), the side body (2) is provided with a sixth gasket contact surface (2-3), the fifth gasket contact surface (1-3) and the sixth gasket contact surface (2-3) form the special-shaped sealing cavity (7-3) and the arc-shaped protrusion (7-7), the abutting positions of the fifth gasket contact surface (1-3) and the sixth gasket contact surface (2-3) are both located at the vertex position of the arc-shaped protrusion (7-7), and the arc-shaped protrusions (7-7) on the inner wall bottom surface and the top surface of the special-shaped sealing cavity (7-3) face in opposite directions.

3. The auxiliary seal valve of claim 1, wherein: The valve stem sealing assembly (5) comprises a special-shaped thrust washer (5-1), a packing (5-2) and a press ring (5-3); The bottom of the valve stem (4) is provided with a conical boss (4-1), and the special-shaped thrust washer (5-1) is sealingly arranged between the conical boss (4-1) and the valve body (1); The valve stem (4) and the valve body (1) are provided with the packing (5-2) therebetween, and the press ring (5-3) is tightly buckled above the packing (5-2) and sealingly arranged between the valve stem (4) and the valve body (1); The upper end of the valve stem (4) is threadedly connected with a hexagonal nut (8), and the hexagonal nut (8) is in pressure matching with the press ring (5-3).

4. The auxiliary seal valve of claim 3, wherein: A double-layer butterfly elastic sheet (9) is arranged between the hexagonal nut (8) and the press ring (5-3).

5. The auxiliary seal valve of claim 1, wherein: The top of the valve stem (4) is provided with a handle (10).

6. The auxiliary seal valve of claim 1, wherein: Both sides of the ball body (3) are provided with valve seats (6), and the side of each valve seat (6) away from the ball body (3) is provided with an elastic groove (6-1).

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