Loose joint ball valve with better sealing performance

Abstract

The loose joint ball valve comprises a valve body, a loose joint pipe and a check nut, the valve body is provided with a loose joint port, a check convex ring is formed on the circumferential side face of the loose joint pipe, the check nut is arranged on the loose joint pipe in a sleeved mode, and a first sealing step and a second sealing step are sequentially formed on the inner wall of the port from inside to outside. A first sealing ring is arranged on the first sealing step, the side wall of the second sealing step is in a concave arc face shape, a second sealing ring is arranged on the second sealing step, the face, facing the side wall of the second sealing step, of the second sealing ring is in a convex arc face shape, and the tightening nut is connected to the loose joint port in a threaded mode so that the tightening protruding ring can abut against the end face of the loose joint port. The tightening convex ring presses the second sealing ring on the second sealing step, and the end face of the loose joint pipe presses the first sealing ring on the first sealing step. According to the loose joint ball valve with the better sealing performance, double sealing of the loose joint pipe and the valve body is achieved, the sealing performance of the ball valve is enhanced, and the service life of the ball valve is prolonged.

Description

Technical Field

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

[0002] The union ball valve is a kind of ball valve, which is used to be installed on a pipeline to cut off and control the flow of the medium in the pipeline. Its characteristic is that the valve body has one or more union ports, and a union pipe is detachably connected to the union port through a union nut, which is convenient for the disassembly of the ball valve after it is installed on the pipeline. For the existing union ball valve, the seal between the union pipe and the valve body is realized by a sealing ring pressed between the end face of the union pipe and the end face of the union port. However, in this sealing form, the sealing ring is prone to aging due to the scouring of the medium flowing in the valve body, resulting in the decline of the sealing performance of the union ball valve and the leakage of the medium.

[0003] In view of the above problems, the utility model is improved. Summary of the Utility Model

[0004] The utility model provides a union ball valve with better sealing performance, which solves the above problems existing in the prior art during use.

[0005] The technical solution of the utility model is realized as follows:

[0006] A union ball valve with better sealing performance includes a valve body, a union pipe and a union nut. The valve body has a union port. A union convex ring is formed on the circumferential side surface of the union pipe. The union nut is sleeved on the union pipe. A first sealing step and a second sealing step are sequentially formed on the inner wall of the port from inside to outside. A first sealing ring is arranged on the first sealing step. The side wall of the second sealing step is in a concave arc shape and a second sealing ring is arranged on the second sealing step. The surface of the second sealing ring facing the side wall of the second sealing step is in a convex arc shape. The union nut is screwed on the union port so that the union convex ring abuts against the end face of the union port. The union convex ring presses the second sealing ring on the second sealing step, and the end face of the union pipe presses the first sealing ring on the first sealing step.

[0007] Preferably, a sealing ring portion is formed at the end of the union pipe and tightly abuts against the inner hole wall of the first sealing ring.

[0008] Preferably, a limiting elastic piece is fixedly connected to the valve body. The end of the limiting elastic piece is located on one side of the circumferential side surface of the union nut, and a limiting protrusion is formed on the inner side surface of the limiting elastic piece. A plurality of limiting grooves are formed on the circumferential side surface of the union nut and are annularly arranged along the axis of the union nut and are matched with the limiting protrusion. The limiting protrusion is clamped into the limiting groove.

[0009] Preferably, a plurality of the limiting elastic pieces are arranged in an annular array along the axis of the union port.

[0010] Preferably, an installation ring is sleeved on the circumferential side surface of the union port, bolts are inserted through the installation ring and screwed on the circumferential side surface of the union port, and the limiting elastic pieces are integrally formed on the installation ring.

[0011] Preferably, both the limiting protrusion and the limiting groove are in the shape of a truncated pyramid.

[0012] Preferably, an operation dial is formed on the outer side surface of the limiting elastic piece and is inclined.

[0013] In summary, the beneficial effects of the present utility model are as follows: through the action of the first sealing ring and the second sealing ring, double sealing is achieved between the valve body and the union pipe. When the first sealing ring is aged due to medium erosion and the sealing performance decreases, the sealing between the valve body and the union can still be ensured, thereby enhancing the overall sealing performance of the ball valve and increasing the service life of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a schematic cross-sectional view of the present utility model;

[0016] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0017] Figure 3 is an exploded schematic view of the union port of the present utility model;

[0018] Figure 4 is a schematic structural view of the installation ring and the limiting elastic piece of the present utility model.

[0019] In the figure: 1, valve body; 11, union port; 12, first sealing step; 13, second sealing step; 2, union pipe; 21, tightening convex ring; 22, sealing ring part; 3, tightening nut; 31, limiting groove; 4, first sealing ring; 5, second sealing ring; 6, limiting elastic piece; 61, limiting protrusion; 62, operation dial; 7, installation ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will combine the drawings in the embodiments of the present utility model Figures 1-4, the technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0021] As shown in the figure, a union ball valve with better sealing performance includes a valve body 1, a union pipe 2 and a tightening nut 3. The valve body 1 has at least one union port 11. A tightening convex ring 21 is formed on the circumferential side surface of the union pipe 2. The tightening nut 3 is sleeved on the union pipe 2. A first sealing step 12 and a second sealing step 13 which are connected in sequence are formed on the inner wall of the port from inside to outside. A first sealing ring 4 is arranged on the first sealing step 12. The side wall of the second sealing step 13 is in a concave arc shape and a second sealing ring 5 is arranged on the second sealing step 13. The surface of the second sealing ring 5 facing the side wall of the second sealing step 13 is in a convex arc shape. The tightening nut 3 is screwed on the union port 11 so that the tightening convex ring 21 abuts against the end surface of the union port 11. The tightening convex ring 21 presses the second sealing ring 5 against the second sealing step 13. The end surface of the union pipe 2 presses the first sealing ring 4 against the first sealing step 12.

[0022] In the above embodiment, the first sealing ring 4 realizes the first - stage seal between the union pipe 2 and the valve body 1, and the second sealing ring 5 realizes the second - stage seal between the union pipe 2 and the valve body 1, thus achieving double - stage sealing between the union pipe 2 and the valve body 1. When the first sealing ring 4 is eroded by the medium flowing through the valve body 1 and the union pipe 2, resulting in aging and other situations that cause the sealing performance of the first sealing ring 4 to decline, the sealing performance between the union pipe 2 and the valve body 1 is ensured by the action of the second sealing ring 5, thereby enhancing the overall sealing performance of the ball valve and extending the service life of the ball valve. Moreover, by setting the sealing rings that cooperate with each other between the second sealing step 13 and the second sealing ring 5 to be circular arcs, the second sealing ring 5 can better fit with the second sealing step 13 when being pressed by the sealing convex ring, thereby achieving a better sealing effect and improving the overall sealing performance of the ball valve.

[0023] Preferably, a sealing ring portion 22 that tightly abuts against the inner hole wall of the first sealing ring 4 is formed at the end of the union pipe 2. By the contact between the sealing ring portion 22 and the inner hole wall of the first sealing ring 4, the first sealing ring 4 can better fit with the first sealing step 12 to achieve a better sealing effect. And the sealing ring portion 22 reduces the direct erosion of the first sealing ring 4 by the medium flowing through the valve body 1 and the union pipe 2, thereby extending the service life of the first sealing ring 4 and further extending the service life of the ball valve.

[0024] Further, a limiting elastic piece 6 is fixedly connected to the valve body 1. The end of the limiting elastic piece 6 is located on one side of the circumferential side of the tightening nut 3, and a limiting protrusion 61 is formed on the inner side surface of the limiting elastic piece 6. A plurality of limiting grooves 31 are formed on the circumferential side of the tightening nut 3, which are annularly arranged along the axis of the tightening nut 3 and are matched with the limiting protrusion 61. The limiting protrusion 61 is snapped into the limiting groove 31.

[0025] In the above preferred embodiment, after the tightening nut 3 is tightened, through the cooperation of the limiting protrusion 61 snapped into the limiting groove 31 and the limiting groove 31, the rotation of the tightening nut 3 is limited, preventing the union joint 2 from being affected by pipeline resonance during the use of the ball valve and causing the tightening nut 3 to become loose, ensuring that the tightening nut 3 remains in the position of tightly pressing against the tightening convex ring 21 to compress the second sealing ring 5 and the first sealing ring 4, thereby enhancing the overall sealing performance of the ball valve.

[0026] Preferably, a plurality of the limiting elastic pieces 6 are annularly arranged along the axis of the union joint port 11. By providing a plurality of limiting elastic pieces 6, the limiting effect of the limiting elastic piece 6 on the rotation of the tightening nut 3 through the cooperation of the limiting protrusion 61 and the limiting groove 31 is enhanced, thereby enhancing the overall sealing performance of the ball valve.

[0027] Preferably, an installation ring 7 is sleeved on the circumferential side of the union joint port 11. A bolt screwed on the circumferential side of the union joint port 11 is passed through the installation ring 7. The limiting elastic piece 6 is integrally formed on the installation ring 7. The installation of the limiting elastic piece 6 and the union joint port 11 is facilitated through the action of the installation ring 7, which is convenient for the assembly during the production of the ball valve. And through the action of the installation ring 7, the plurality of limiting elastic pieces 6 have stronger integrity, thereby enhancing the limiting effect of the limiting elastic piece 6 on the rotation of the tightening nut 3.

[0028] Preferably, both the limiting protrusion 61 and the limiting groove 31 are in the shape of a qian du (a three-dimensional geometric shape). The cooperation between the limiting protrusion 61 and the limiting groove 31 can exert a strong limiting effect on the tightening nut 3 in a single rotation direction, that is, the tightening nut 3 can freely rotate along the tightening direction to deflect the limiting elastic piece 6 so that the limiting protrusion 61 is snapped into different positions of the limiting groove 31, which is convenient for the operation when tightening the tightening nut 3 to install the union joint 2, while the tightening nut 3 cannot rotate along the rotation direction.

[0029] Preferably, an operation dial piece 62 is formed on the outer side surface of the limiting elastic piece 6 and is inclined. When disassembling the union joint 2, by pressing the operation dial piece 62, the limiting elastic piece 6 can be driven to swing, so that the limiting protrusion 61 leaves the limiting groove 31, canceling the limit on the rotation of the tightening nut 3, enabling the tightening nut 3 to rotate along the loosening direction, thus facilitating the operation when disassembling the union joint 2.

[0030] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flexible ball valve with better sealing performance, comprising a valve body (1), a flexible pipe (2) and a tightening nut (3), wherein the valve body (1) has a flexible port (11), a tightening convex ring (21) is formed on the peripheral side of the flexible pipe (2), and the tightening nut (3) is sleeved on the flexible pipe (2), characterized in that: A first sealing step (12) and a second sealing step (13) are sequentially formed on the inner wall of the port from the inside to the outside, a first sealing ring (4) is arranged on the first sealing step (12), a side wall of the second sealing step (13) is in the shape of an inwardly concave arc surface, and a second sealing ring (5) is arranged on the second sealing step (13), a surface of the second sealing ring (5) facing the side wall of the second sealing step (13) is in the shape of an outwardly convex arc surface, the tightening nut (3) is screwed onto the live joint port (11) so that the tightening convex ring (21) abuts against the end surface of the live joint port (11), the tightening convex ring (21) presses the second sealing ring (5) onto the second sealing step (13), and the end surface of the live joint (2) presses the first sealing ring (4) onto the first sealing step (12).

2. The live-joint ball valve with better sealing performance according to claim 1 is characterized in that: The end of the flexible pipe (2) is formed with a sealing ring portion (22) which is tightly pressed against the inner hole wall of the first sealing ring (4).

3. The live-joint ball valve with better sealing performance according to claim 1 is characterized in that: A limiting spring sheet (6) is fixedly connected to the valve body (1), an end of the limiting spring sheet (6) is located on one side of the peripheral side of the tightening nut (3), and a limiting protrusion (61) is formed on the inner side of the limiting spring sheet (6), a plurality of limiting grooves (31) arranged in an annular array along the axis of the tightening nut (3) and matching with the limiting protrusion (61) are formed on the peripheral side of the tightening nut (3), and the limiting protrusion (61) is snapped into the limiting groove (31).

4. The live-joint ball valve with better sealing performance according to claim 3 is characterized in that: A plurality of the limiting spring pieces (6) are arranged in a ring array along the axis of the movable joint port (11).

5. The live-joint ball valve with better sealing performance according to claim 4 is characterized in that: A mounting ring (7) is sleeved on the side surface of the movable port (11), a bolt threadedly connected to the side surface of the movable port (11) is passed through the mounting ring (7), and the limiting spring sheet (6) is integrally formed on the mounting ring (7).

6. The live-joint ball valve with better sealing performance according to claim 5 is characterized in that: The limiting protrusion (61) and the limiting groove (31) are both of a trench-blocking type.

7. The live-joint ball valve with better sealing performance according to claim 6 is characterized in that: An operating paddle (62) arranged obliquely is formed on the outer side surface of the limiting spring piece (6).

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