A breakaway valve

Abstract

The present invention discloses a breakaway valve, comprising a first valve body, a second valve body and a buckle structure, wherein the first valve body and the second valve body are fastened and connected by the buckle structure; the buckle structure comprises a tensioning ring connected with a drawstring, a fastener and a rotating member, wherein the fastener is rotatably connected to the first valve body, and the head of the fastener is fastened to the second valve body, the rotating member is arranged at the head of the fastener, and a tensioning ring is arranged between the tail of the fastener and the first valve body. The breakaway valve disclosed by the present invention has a rotating member arranged at the head of the fastener, and the pressing force between the head of the fastener and the second valve body can be adjusted by adjusting the tightness of the rotating member. In actual work, the drawstring is pulled due to an error, and the tensioning ring is pulled. Since the rotating member increases the pressing force between the head of the fastener and the second valve body, the first valve body and the second valve body are not easy to be disengaged.

Description

Technical Field

[0001] The invention relates to the technical field of safety devices in a medium conveying system, and in particular to a breakaway valve. Background Art

[0002] A breakaway valve is a device that reduces medium leakage and stops medium flow. A breakaway valve is usually connected between devices. Under specified conditions and within the specified tension range, it disconnects the devices to prevent leakage of the medium transmitted within the devices. It is a safety device suitable for use in transportation systems that transport hydrocarbons, solvent hydrocarbons and chemicals to vehicles, ships, light aircraft or mobile tank containers.

[0003] In the existing technical solution, the buckle structure of the breakaway valve is composed of a rotating hook, a tensioning ring, a hook fixing ring and a pull rope. The rotating hook is arranged at the junction of the end faces of the two valve bodies. The hook fixing ring fixes the rotating hook on one of the valve bodies. The claw of the rotating hook is hooked on the other valve body. A tensioning ring is arranged in the gap between the rear end of the rotating hook and the valve body, and a pull rope is connected to the tensioning ring. When the pull rope is subjected to an external tension exceeding the set value, the tensioning ring will be separated from the rear end of the rotating hook. Under the reaction force of the preload force, the hook rotates a certain angle, and the left second valve body is separated under the action of the valve core spring force. This structure is a main structural form of a breakaway valve for fluid transmission safety protection.

[0004] The disadvantages of the existing technical solutions are as follows: 1) The hook is separated from the valve body, which makes assembly difficult. It is easy to trigger the separation by mistake due to external factors, causing adverse impact on the working system, wasting materials and being environmentally friendly. 2) The clamping force cannot be adjusted, the product reliability and qualified rate are low, and the force of the rotating hook to press the second valve body cannot be adjusted. 3) If the clamping force of the rotating hook is reduced, the pull rope will be easily triggered or mistakenly triggered to disconnect the pull-off valve during operation, affecting the normal fluid delivery work. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a breakaway valve, which can adjust the pressing force of the rotating hook claw to prevent the valve bodies from being erroneously triggered and disengaged during normal operation.

[0006] The above technical problems are solved by the following technical solutions:

[0007] A breakaway valve comprises a first valve body, a second valve body and a buckle structure, wherein the end surface of the first valve body and the end surface of the second valve body are opposite to each other and are tightly connected by the buckle structure;

[0008] The buckle structure includes a tensioning ring connected to a draw rope, a fastener and a rotating part. The fastener is rotatably connected to the first valve body, and the head of the fastener is fastened to the second valve body. The rotating part is arranged at the head of the fastener, and a tensioning ring is arranged between the tail of the fastener and the first valve body.

[0009] In the above-mentioned breakaway valve, a protrusion is provided on the annular edge of the end surface of the second valve body, and the head of the fastening member is buckled on the protrusion.

[0010] In the above-mentioned breakaway valve, the rotating member is rotatably connected to the head of the fastening member and is pressed against the protrusion.

[0011] In the above-mentioned breakaway valve, a boss is provided on the annular edge of the end surface of the first valve body, and the fastening member is rotatably connected to the boss.

[0012] In the above-mentioned breakaway valve, a gap is left between the tail of the fastener and the first valve body, and the tensioning ring is clamped in the gap.

[0013] In the above-mentioned breakaway valve, a first elastic member is provided inside the first valve body, a first valve cover is provided at one end of the first elastic member close to the end surface of the first valve body, a second elastic member is provided inside the second valve body, a second valve cover is provided at one end of the second elastic member close to the end surface of the second valve body, the second valve cover is in contact with the first valve cover, and the first elastic member and the second elastic member are both in a compressed state.

[0014] In the above-mentioned breakaway valve, a positioning piece is provided on the first valve body, and the pull rope is passed through the positioning piece.

[0015] The breakaway valve of the present invention has the following beneficial effects compared with the background technology:

[0016] Since a rotating part is provided at the head of the fastener, the clamping force between the head of the fastener and the second valve body can be adjusted by adjusting the tightness of the rotating part. In actual work, the pull rope is pulled due to mistake and the tensioning ring is pulled. Since the rotating part increases the clamping force between the head of the fastener and the second valve body, the first valve body and the second valve body are not easy to disengage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 2 is a schematic diagram of the overall structure of a breakaway valve according to an embodiment of the present invention;

[0018] Figure 2 2 is a cross-sectional view of a breakaway valve according to an embodiment of the present invention.

[0019] Among them, 1. a first valve body, 11. a boss, 12. a first elastic member, 13. a first valve cover, 2. a second valve body, 21. a protrusion, 22. a second elastic member, 23. a second valve cover, 3. a buckle structure, 31. a tensioning ring, 32. a pull rope, 33. a fastener, 34. a rotating member, 35. a positioning member. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] Combination Figure 1 to Figure 2 As shown, the specific embodiment provided by the present invention is a breakaway valve, comprising a first valve body 1, a second valve body 2 and a buckle structure 3, wherein the end surface of the first valve body 1 and the end surface of the second valve body 2 are opposite to each other and are tightly connected through the buckle structure 3;

[0022] The buckle structure 3 includes a tensioning ring 31 connected to a pull rope 32, a fastener 33 and a rotating member 34. The fastener 33 is rotatably connected to the first valve body 1, and the head of the fastener 33 is buckled on the second valve body 2. The rotating member 34 is arranged at the head of the fastener 33, and a tensioning ring 31 is arranged between the tail of the fastener 33 and the first valve body 1.

[0023] Preferably, the end face of the first valve body 1 and the end face of the second valve body 2 are relatively covered, and the position where the two end faces meet is referred to as the joint. The buckle structure 3 is provided at the joint to connect the first valve body 1 and the second valve body 2. The buckle structure 3 is provided at the end faces of the first valve body 1 and the second valve body 2 to facilitate a better connection between the first valve body 1 and the second valve body 2, and can also make the buckle structure 3 more compact.

[0024] Preferably, a protrusion 21 is provided on the annular edge of the end face of the second valve body 2, and the head of the fastener 33 is fastened to the protrusion 21. When the end faces of the first valve body 1 and the second valve body 2 are opposite to each other and connected, the head of the fastener 33 is fastened to the protrusion 21. The protrusion 21 is annular and surrounds the end face of the second valve body 2 in a full circle. The number of fasteners 33 depends on actual conditions. The fasteners 33 are distributed on the edge of the first valve body 1 in a symmetrical manner with the center of the first valve body 1.

[0025] Preferably, the protrusion 21 is trumpet-shaped toward the end surface of the second valve body 2, and the rotating member 34 is rotationally connected to the head of the fastening member 33 and pressed against the trumpet-shaped protrusion 21. The trumpet-shaped protrusion 21 helps the head of the fastening member 33 to better fasten the second valve body 2, thereby increasing the fastening force of the fastening member 33 on the second valve body 2, making the connection between the first valve body 1 and the second valve body 2 more stable.

[0026] Preferably, a boss 11 is provided on the annular edge of the end face of the first valve body 1, and the fastener 33 is rotatably connected to the boss 11. This is different from the prior art, in which a fixing ring is used to fix the fastener 33 to the flange on the first valve body 1 to achieve the positioning of the fastener 33.

[0027] Preferably, a gap is left between the tail of the fastener 33 and the first valve body 1 , the tensioning ring 31 is sleeved on the first valve body 1 and located at the gap, and the tensioning ring 31 is clamped on the first valve body 1 and located between the tail of the fastener 33 and the first valve body 1 .

[0028] Preferably, a first elastic member 12 is provided inside the first valve body 1, and a first valve cover 13 is provided at one end of the first elastic member 12 close to the end surface of the first valve body 1, a second elastic member 22 is provided inside the second valve body 1, and a second valve cover 23 is provided at one end of the second elastic member 22 close to the end surface of the second valve body 2, and the second valve cover 23 is in contact with the first valve cover 13. At this time, the first elastic member 12 and the second elastic member 22 are both in a compressed state. It should be pointed out that when the first valve body 1 and the second valve body 2 are in a joined state, since the first valve cover 13 connected to the first elastic member 12 and the second valve cover 23 connected to the second elastic member 22 are in a state of mutual conflict, and because the first valve cover 13 is far away from the side of the first elastic member 12 and the second valve cover 23 is far away A protruding structure is provided on one side away from the second elastic member 22, and the protruding structures on the first valve cover 13 and the second valve cover 23 are in contact with each other, so at this time the first elastic member 12 and the second elastic member 22 are both in a compressed length state, so when the first valve body 1 and the second valve body 2 are separated, the first elastic member 12 will stretch and push the first valve cover 13 toward the end face of the first valve body 1, and the first valve cover 13 covers the end face of the first valve body 1 from the inside of the first valve body 1, and the second elastic member 22 will also stretch and push the second valve cover 23 toward the end face of the second valve body 2, and the second valve cover 23 covers the end face of the second valve body 2 from the inside of the second valve body 2, so that after the first valve body 1 and the second valve body 2 are separated, the first valve body 1 and the second valve body 2 can keep sealing the leakage of the valve body contents.

[0029] Preferably, a positioning member 35 is provided on the first valve body 1, and a pull rope 32 is passed through the positioning member 35. When the break valve is triggered, the pull rope 32 moves away from the second valve body 2. The pulling of the pull rope 32 will drive the tensioning ring 31 to detach from the tail of the fastening member 33.

[0030] In summary, the breakaway valve of the present invention has the following beneficial effects compared with the background technology:

[0031] Since a rotating part is provided at the head of the fastener, the clamping force between the head of the fastener and the second valve body can be adjusted by adjusting the tightness of the rotating part. In actual work, the pull rope may be pulled due to error and the tensioning ring may be pulled. Since the rotating part increases the clamping force between the head of the fastener and the second valve body, the first valve body and the second valve body are not easy to disengage, which can avoid the losses of customers caused by abnormal disengagement (loss due to overflow of the conveying medium, loss of working hours required for manual resetting); and since the rotating part can relieve the pressure on the head of the fastener, the service life of the breakaway valve product can be extended, and it will not be scrapped prematurely due to insufficient clamping force of the fastener; the way the fastener is fixed to the valve body is simplified, and the use of the fastener fixing ring is omitted, which can indirectly reduce costs.

[0032] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0033] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A breakaway valve, characterized in that: It comprises a first valve body, a second valve body and a buckle structure, wherein the end surface of the first valve body and the end surface of the second valve body are opposite to each other and are tightly connected by the buckle structure; The buckle structure includes a tension ring connected with a drawstring, a fastener and a rotating member, the fastener is rotatably connected to the first valve body, and the head of the fastener is fastened to the second valve body, the rotating member is arranged at the head of the fastener, and a tension ring is arranged between the tail of the fastener and the first valve body; The annular edge of the end surface of the second valve body is provided with a protrusion, the head of the fastener is buckled on the protrusion, the rotating member is rotatably connected to the head of the fastener and pressed against the protrusion, and the pressing force between the head of the fastener and the second valve body can be adjusted by adjusting the tightness of the rotating member; The protrusion is annular and is arranged around the end surface of the second valve body in a whole circle; The fasteners are centrally symmetrical with respect to the center of the first valve body and are distributed on the edge of the first valve body; The protrusion is in a trumpet shape toward the end surface of the second valve body; the trumpet-shaped protrusion is conducive to helping the head of the fastener to better fasten the second valve body; A boss is provided on the annular edge of the end surface of the first valve body, and the fastening member is rotatably connected to the boss.

2. The breakaway valve according to claim 1, characterized in that: A gap is left between the tail of the fastener and the first valve body, and the tensioning ring is clamped in the gap.

3. The breakaway valve according to claim 1, characterized in that: A first elastic member is provided inside the first valve body, and a first valve cover is provided at one end of the first elastic member close to the end surface of the first valve body. A second elastic member is provided inside the second valve body, and a second valve cover is provided at one end of the second elastic member close to the end surface of the second valve body. The second valve cover is in contact with the first valve cover, and at this time, the first elastic member and the second elastic member are both in a compressed state.

4. The breakaway valve according to any one of claims 1 to 3, characterized in that: A positioning piece is provided on the first valve body, and the pull rope is passed through the positioning piece.

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