Sealing structure of ball valve

Abstract

The utility model discloses a ball valve sealing structure which comprises a valve body and a valve rod, the valve rod is arranged in the valve body, a sealing assembly is arranged between the valve rod and the valve body in a sealing fit mode, a sealing groove used for installing the sealing assembly is formed in the valve body, and the sealing assembly is arranged in the sealing groove in an abutting mode. The sealing assembly comprises a pressing ring, a plurality of sealing rings and a sealing base which are sequentially arranged in a stacked mode from top to bottom, the sealing base is arranged on the valve rod in a sleeving mode and arranged in the sealing groove in an abutting mode, the sealing rings are arranged on the sealing base in a pressed mode, and the pressing ring is arranged on the sealing rings in a pressed mode and arranged on the side away from the sealing base. The sealing structure of the ball valve has the advantages of being stable in sealing and capable of preventing the problem of sealing failure of a sealing piece when the ball valve works in the later period.

Description

Technical Field

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

[0002] A ball valve is a valve in which the ball is driven by the valve stem and rotates around the axis of the ball valve. The ball controls the flow of the medium by opening and closing the channel. In order to prevent the medium from leaking on the spherical surface, seals are often provided in the ball valve. However, in the later operation, due to the gradual generation of larger gaps, the seals fail to seal, causing liquid leakage in the valve body, posing a major safety hazard. Utility Model Content

[0003] In view of the above problems, the utility model proposes a sealing structure of a ball valve, which has the advantage of stable sealing and prevents the problem of sealing failure of the sealing member during the later operation of the ball valve.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: comprising a valve body and a valve stem, the valve stem being arranged inside the valve body, a sealing assembly being sealed between the valve stem and the valve body, a sealing groove for installing the sealing assembly being opened inside the valve body, the sealing assembly being tightly arranged in the sealing groove, the sealing assembly comprising a pressure ring, a plurality of sealing rings and a sealing base which are stacked tightly from top to bottom in sequence, the sealing base being sleeved on the valve stem and tightly arranged in the sealing groove, the sealing ring being pressed on the sealing base, the pressure ring being pressed on the sealing ring and arranged on the side away from the sealing base, and a reset assembly being provided on the pressure ring facing the valve body opening.

[0005] By adopting the above technical solution, the sealing base is sleeved on the valve stem and set in the sealing groove during installation, and then the sealing rings are stacked and tightly set on the sealing base in sequence, and then the pressure ring is pressed and set on the sealing ring, and the sealing pressure formed by the reset assembly is transmitted downward. When the valve stem is inserted downward into the valve body, a tight seal can be formed between the valve stem and the valve body through the sealing assembly, which has the advantage of stable sealing and prevents the problem of sealing failure of the seal when the ball valve is working in the later stage.

[0006] The utility model is further configured such that a first installation step is provided in the valve body on one side facing the sealing groove, the reset assembly is tightly arranged on the first installation step, a nut is threadedly connected to the valve stem, and one end of the nut is pressed against the reset assembly.

[0007] By adopting the above technical solution, the reset assembly is arranged between the nut and the first mounting step. The first mounting step can provide support and positioning for the reset assembly, thereby further transmitting the downward sealing pressure of the nut, thereby achieving the effect of improving the stability of the structure.

[0008] The utility model is further configured such that the reset assembly includes a first leaf spring and a second leaf spring, the first leaf spring is provided with a first inclined surface toward the nut side, the second leaf spring is provided with a second inclined surface toward the pressure ring side, and the first leaf spring and the second leaf spring form a tight contact.

[0009] By adopting the above technical solution, the arrangement of the first inclined surface and the second inclined surface can increase the force travel of the first leaf spring and the second leaf spring, increase the space for telescopic deformation, and thus further transmit the downward sealing pressure of the nut.

[0010] The present invention is further configured such that the first leaf spring is provided with a third inclined surface on one side facing the second leaf spring, and the second leaf spring is provided with a fourth inclined surface symmetrically arranged with the third inclined surface, and the third inclined surface and the fourth inclined surface form abutment and define a pressure chamber.

[0011] By adopting the above technical solution, the third inclined surface and the fourth inclined surface can increase the force-bearing stroke of the structure and increase the sealing pressure, wherein the pressure chamber can provide space for telescopic deformation, thereby improving the effect of the first leaf spring and the second leaf spring in transmitting the sealing pressure.

[0012] The utility model is further configured such that the pressure ring is provided with a conical opening toward the sealing ring side, the specific angle of the conical opening is 0-90°, the sealing ring is provided with an abutment portion toward the conical opening side, the abutment portion is sealed in the conical opening, and a first gap is provided between the abutment portion and the conical opening.

[0013] By adopting the above technical solution, the pressure ring is in a planar state and forms a tight contact with the second leaf spring, which increases the contact area between the two and further improves the pressure transmission effect. The abutment portion is sealed and tightly arranged in the conical opening, which increases the contact area between the two and plays a role in stably transmitting the force during the tight contact. The first gap provides space for the sealing ring and the pressure ring to expand and contract.

[0014] The present invention is further configured such that one end of the abutting portion is connected to a first extending leg toward the valve body, and the other end is connected to a second extending leg toward the valve stem. A clearance opening is provided between the first extending leg and the second extending leg, and the specific angle of the clearance opening is 0-90°. A second gap is provided between adjacent sealing rings.

[0015] Through the above technical solution, when the abutting part is subjected to downward pressure, the first extended leg cooperates with the second extended leg to deform and extend outward, forming a tight seal between the valve stem and the valve body. The three-layer sealing ring can stably transmit the abutting force, and the second gap provides space for expansion and contraction deformation between adjacent sealing rings, avoiding the problem of reduced sealing caused by structural wear.

[0016] The utility model is further configured such that a second mounting step is provided in the valve body protruding toward the valve stem side, the sealing base is pressed against the second mounting step, and a conical flange is provided in the sealing base protruding toward the sealing ring side, the specific angle of the conical flange is 0-90°, the conical flange is sealed and fitted in the clearance opening, and a third gap is provided between the clearance opening and the conical flange.

[0017] Through the above technical solution, the second installation step can provide stable support for the sealing base, and the conical flange seal is tightly arranged in the yielding opening, thereby increasing the contact area between the two. The third gap can provide space for the sealing ring and the sealing base to expand and contract, thereby stably transmitting the pressing force and achieving the effect of transmitting sealing pressure between the sealing ring and the pressure ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the valve stem, sealing assembly and reset assembly of the utility model.

[0020] In the figure, 1 is the valve body; 2 is the valve stem; 3 is the sealing assembly; 4 is the sealing groove; 5 is the pressure ring; 8 is the sealing ring; 9 is the sealing base; 10 is the reset assembly; 11 is the first mounting step; 12 is the nut; 13 is the first leaf spring; 14 is the second leaf spring; 15 is the first inclined surface; 16 is the second inclined surface; 17 is the third inclined surface; 18 is the fourth inclined surface; 19 is the pressure chamber; 20 is the conical opening; 21 is the abutting portion; 23 is the first extending leg; 24 is the second extending leg; 25 is the clearance opening; 26 is the second mounting step; 27 is the conical flange; 110 is the first gap; 119 is the second gap; 120 is the third gap. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example: As shown in the attached Figures 1-2 The sealing structure of a ball valve shown in the figure includes a valve body 1 and a valve stem 2, the valve stem 2 is arranged inside the valve body 1, and a sealing component 3 is sealed between the valve stem 2 and the valve body 1. A sealing groove 4 for installing the sealing component 3 is opened inside the valve body 1, and the sealing component 3 is tightly arranged in the sealing groove 4. The sealing component 3 includes a pressure ring 5, a plurality of sealing rings 8 (specifically three and with the same structure) and a sealing base 9 stacked tightly from top to bottom. The sealing base 9 is sleeved on the valve stem 2 and tightly arranged in the sealing groove 4. The sealing ring 8 is pressed against the sealing base 9, and the pressure ring 5 is pressed against the sealing base 9. It is placed on the sealing ring 8 and arranged on the side away from the sealing base 9. The pressure ring 5 is provided with a reset assembly 10 at the opening of the valve body 1. During installation, the sealing base 9 is sleeved on the valve stem 2 and arranged in the sealing groove 4. Secondly, the sealing ring 8 is stacked and tightly arranged on the sealing base 9 in sequence, and then the pressure ring 5 is pressed and arranged on the sealing ring 8, and the sealing pressure formed downward by the reset assembly 10 is transmitted. When the valve stem 2 is inserted downward into the inside of the valve body 1, a seal can be formed between the valve stem 2 and the valve body 1 through the sealing assembly 3, which has the advantage of stable sealing and prevents the problem of sealing failure of the seal when the ball valve is working in the later stage.

[0023] As attached Figure 1 and attached Figure 2 As shown, a first mounting step 11 (an integrated structure) is provided in the valve body 1 on one side facing the sealing groove 4, and the reset assembly 10 is tightly arranged on the first mounting step 11. A nut 12 is threadedly connected to the valve stem 2, and one end of the nut 12 is pressed against the reset assembly 10. The reset assembly 10 is arranged between the nut 12 and the first mounting step 11. The first mounting step 11 can provide support and positioning for the reset assembly 10, thereby further transmitting the downward sealing pressure of the nut 12, thereby achieving the effect of improving the stability of the structure.

[0024] As attached Figure 1 and attached Figure 2 As shown, the reset assembly 10 includes a first leaf spring 13 and a second leaf spring 14. The first leaf spring 13 is provided with a first inclined surface 15 (the specific angle of the first inclined surface 15 is 0-45°) on the side facing the nut 12, and the second leaf spring 14 is provided with a second inclined surface 16 (the specific angle of the second inclined surface 16 is 0-45°) on the side facing the pressure ring 5. The first leaf spring 13 and the second leaf spring 14 are tightly pressed together. The setting of the first inclined surface 15 and the second inclined surface 16 can increase the force stroke of the first leaf spring 13 and the second leaf spring 14, increase the space for telescopic deformation, and thus further transmit the downward sealing pressure of the nut 12.

[0025] As attached Figure 2As shown, the first leaf spring 13 is provided with a third inclined surface 17 (the specific angle of the third inclined surface 17 is 0-45°) on the side facing the second leaf spring 14, and the second leaf spring 14 is provided with a fourth inclined surface 18 (the specific angle of the fourth inclined surface 18 is 0-45°) symmetrically arranged with the third inclined surface 17. The third inclined surface 17 and the fourth inclined surface 18 are in contact with each other and a pressure chamber 19 is provided. The third inclined surface 17 and the fourth inclined surface 18 can increase the force-bearing stroke of the structure and increase the sealing pressure, wherein the pressure chamber 19 can provide space for telescopic deformation, thereby improving the effect of the first leaf spring 13 and the second leaf spring 14 in transmitting the sealing pressure.

[0026] As attached Figure 2 As shown, the pressure ring 5 is provided with a conical opening 20 on the side facing the sealing ring 8, and the specific angle of the conical opening 20 is 0-90°. The sealing ring 8 is provided with an abutment portion 21 (an integrated structure) on the side facing the conical opening 20, and the abutment portion 21 is sealed and fitted in the conical opening 20. A first gap 110 is provided between the abutment portion 21 and the conical opening 20. The pressure ring 5 is in a planar state and is pressed against the second leaf spring 14, which increases the contact area between the two and further improves the effect of pressure transmission. The abutment portion 21 is sealed and pressed against the conical opening 20, which increases the contact area between the two and plays a role in stably transmitting the force during pressing. The first gap 110 provides space for the sealing ring 8 and the pressure ring 5 to expand and contract.

[0027] As attached Figure 1 and attached Figure 2 As shown, one end of the abutting portion 21 is connected to the side of the valve body 1 with a first extending leg 23 (an integrated structure), and the other end is connected to the side of the valve stem 2 with a second extending leg 24 (an integrated structure). A clearance opening 25 is provided between the first extending leg 23 and the second extending leg 24. The specific angle of the clearance opening 25 is 0-90°. A second gap 119 is provided between adjacent sealing rings 8. When the abutting portion 21 is subjected to downward pressure, the first extending leg 23 cooperates with the second extending leg 24 to deform and extend outward to form a sealing contact between the valve stem 2 and the valve body 1. The three-layer sealing ring 8 can stably transmit the contact force, wherein the second gap 119 provides space for expansion and contraction deformation between adjacent sealing rings 8, thereby avoiding the problem of reduced sealing due to structural wear.

[0028] As attached Figure 1 and attached Figure 2As shown, a second mounting step 26 (an integrated structure) is provided in the valve body 1 on the side facing the valve stem 2, and the sealing base 9 is pressed and arranged on the second mounting step 26. A conical flange 27 (an integrated structure) is provided on the sealing base 9 on the side facing the sealing ring 8. The specific angle of the conical flange 27 is 0-90°, and the conical flange 27 is sealed and fitted in the clearance opening 25. A third gap 120 is provided between the clearance opening 25 and the conical flange 27. The second mounting step 26 can provide a stable support for the sealing base 9, and the conical flange 27 is sealingly pressed and arranged in the clearance opening 25, thereby increasing the contact area between the two. The third gap 120 can provide space for the sealing ring 8 and the sealing base 9 to expand and contract, thereby stably transmitting the pressing force, thereby achieving the effect of transmitting sealing pressure between the sealing ring 8 and the pressure ring 5.

[0029] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words determined for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and cannot be understood as a limitation on the present invention.

Claims

1. A sealing structure for a ball valve, comprising a valve body (1) and a valve stem (2), wherein the valve stem (2) is arranged inside the valve body (1), and is characterized in that: A sealing assembly (3) is provided between the valve stem (2) and the valve body (1), and a sealing groove (4) for installing the sealing assembly (3) is provided inside the valve body (1). The sealing assembly (3) is tightly arranged in the sealing groove (4). The sealing assembly (3) includes a pressure ring (5), a plurality of sealing rings (8) and a sealing base (9) which are stacked and arranged in sequence from top to bottom. The sealing base (9) is sleeved on the valve stem (2) and tightly arranged in the sealing groove (4). The sealing ring (8) is pressed and arranged on the sealing base (9). The pressure ring (5) is pressed and arranged on the sealing ring (8) and is arranged on the side away from the sealing base (9). A reset assembly (10) is provided on the pressure ring (5) facing the opening of the valve body (1).

2. The sealing structure of a ball valve according to claim 1, characterized in that: A first mounting step (11) is provided in the valve body (1) on one side thereof facing the sealing groove (4), and the reset assembly (10) is tightly arranged on the first mounting step (11). A nut (12) is threadedly connected to the valve stem (2), and one end of the nut (12) is tightly arranged on the reset assembly (10).

3. The sealing structure of a ball valve according to claim 2, characterized in that: The reset assembly (10) includes a first leaf spring (13) and a second leaf spring (14), wherein the first leaf spring (13) is provided with a first inclined surface (15) on the side facing the nut (12), and the second leaf spring (14) is provided with a second inclined surface (16) on the side facing the pressure ring (5), and the first leaf spring (13) and the second leaf spring (14) form a tight contact.

4. The sealing structure of a ball valve according to claim 3, characterized in that: The first leaf spring (13) is provided with a third inclined surface (17) on the side facing the second leaf spring (14), and the second leaf spring (14) is provided with a fourth inclined surface (18) symmetrically arranged with the third inclined surface (17). The third inclined surface (17) and the fourth inclined surface (18) are in contact with each other and a pressure chamber (19) is provided.

5. The sealing structure of a ball valve according to claim 1, characterized in that: The pressure ring (5) is provided with a conical opening (20) on the side facing the sealing ring (8), and the specific angle of the conical opening (20) is 0-90 degrees. The sealing ring (8) is provided with an abutment portion (21) on the side facing the conical opening (20), and the abutment portion (21) is sealed and fitted in the conical opening (20). A first gap (110) is provided between the abutment portion (21) and the conical opening (20).

6. The sealing structure of a ball valve according to claim 5, characterized in that: One end of the abutting portion (21) is connected to a first extension leg (23) toward the valve body (1), and the other end is connected to a second extension leg (24) toward the valve stem (2). A clearance opening (25) is provided between the first extension leg (23) and the second extension leg (24). The specific angle of the clearance opening (25) is 0-90°, and a second gap (119) is provided between adjacent sealing rings (8).

7. The sealing structure of a ball valve according to claim 1, characterized in that: A second mounting step (26) is provided in the valve body (1) on the side facing the valve stem (2), and the sealing base (9) is pressed against the second mounting step (26). A conical flange (27) is provided in the sealing base (9) on the side facing the sealing ring (8), and the specific angle of the conical flange (27) is 0-90 degrees. The conical flange (27) is sealed in the clearance opening (25), and a third gap (120) is provided between the clearance opening (25) and the conical flange (27).

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