Over-flow automatic shut-off device

Abstract

The present invention discloses an over-flow automatic closing device, including a valve arranged between a main pipeline and a branch pipeline, the valve is composed of a valve body, a locking mechanism and a trigger mechanism assembled in the valve body; the locking mechanism includes a valve flap and a locking unit, the valve flap is arranged in the valve body at a position corresponding to the inlet of the branch pipeline, the upper end of the valve flap is hinged on the inner wall of the valve body, the lower end of the valve flap is in contact with the locking surface in the locking unit, and the upper end of the locking unit is hinged on the inner wall of the valve body; the trigger mechanism is arranged at the outlet of the main pipeline at the lower end of the locking unit, the trigger mechanism is a hollow cylindrical structure, the top end of which corresponds to the lower end of the trigger control surface of the locking unit, and a throttling orifice plate is arranged on the trigger mechanism. When an over-flow fault occurs in the controlled pipeline, the liquid flow of the controlled pipeline can be quickly and automatically closed, thereby effectively preventing the loss of liquid when the controlled pipeline fails, and also providing safety protection for pipeline maintenance.

Description

Technical Field

[0001] The invention belongs to the technical field of flow control valves and relates to an over-flow automatic closing device, in particular to an over-flow automatic closing device for a main pipeline. Background Art

[0002] The main pipeline transports fluids such as water, oil, gas, and chemicals through branch pipelines. A manual valve is installed between the main pipeline outlet and the branch pipeline inlet. When a leak or rupture in the branch pipeline causes excessive flow, the manual valve is typically turned to seal the branch pipeline. This method of sealing the branch pipeline with a manual valve takes a long time to operate, and can cause large amounts of water, oil, gas, or chemicals to leak during the closing process. Furthermore, if excessive flow occurs and the manual valve is unattended, it may not automatically close. This not only wastes resources but also contributes to environmental pollution.

[0003] In order to solve the above problems, a self-closing valve has emerged. This valve includes a valve, a valve inlet, and a valve outlet. The valve outlet is connected to the valve. The inner cavity of the valve inlet is in the shape of a V-shaped inverted cone at one end connected to the valve. An orifice is opened at the bottom of the cone to connect to the valve. The other end of the inner cavity of the valve inlet is connected to the pipeline and is provided with a mesh baffle. The inner cavity of the valve inlet is also provided with a leakage-proof ball located between the baffle and the V-shaped inverted cone end. The diameter of the ball is larger than the aperture of the cone bottom and smaller than the diameter of the inner cavity.

[0004] When an over-flow occurs, the anti-leakage ball in this self-closing valve will close the cone bottom orifice under the push of the fluid, thereby automatically closing the valve; however, when the valve is in use, even when an over-flow does not occur, the anti-leakage ball will also move toward the cone bottom orifice under the push of the fluid, thereby blocking the fluid from being drawn into the branch pipe, reducing the flow rate of the fluid, and affecting user use. Summary of the Invention

[0005] In order to solve the above deficiencies in the prior art, the present invention aims to provide an over-flow automatic closing device to achieve the purpose of automatically closing when the flow rate exceeds the limit without affecting the use.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an over-flow automatic closing device, comprising a valve arranged between a main pipeline and a branch pipeline, the valve consisting of a valve body, a locking mechanism and a trigger mechanism assembled in the valve body; the locking mechanism comprises a valve disc for closing the inlet of the branch pipeline when an over-flow occurs, and a locking unit for locking the valve disc to keep the branch pipeline unobstructed, the valve disc is arranged in the valve body at a position corresponding to the inlet of the branch pipeline, the upper end of the valve disc is hinged to the inner wall of the valve body, the lower end of the valve disc is in contact with the locking surface of the locking unit, and the upper end of the locking unit is hinged to the inner wall of the valve body; the trigger mechanism is arranged at the outlet of the main pipeline at the lower end of the locking unit, the trigger mechanism is a hollow cylindrical structure, the top end of which corresponds to the trigger control surface of the locking unit, and a throttling orifice is fixed on the trigger mechanism;

[0007] As a limitation of the present invention: the locking unit is composed of a hook and an elastic body for keeping the hook in a locked state of the valve disc, the upper portion of the hook is hinged to the inner wall of the valve body, and the elastic body is arranged between the lower portion of the hook and the valve body;

[0008] As a limitation of the present invention: the outer structure of the hook is an "L" shape, the lower end of which is a pawl, the upper end surface of the pawl is the locking surface of the valve disc, and the lower end surface of the pawl is the trigger control surface;

[0009] As another limitation of the present invention: the throttle orifice is fixed on the inner wall of the hollow column;

[0010] As a further limitation of the present invention: a sealing ring is provided between the trigger mechanism and the main pipe;

[0011] As a further limitation of the present invention: a flange is provided on the outside of the trigger mechanism for preventing the trigger mechanism from falling into the main pipe, and the flange is provided at the upper end of the trigger mechanism.

[0012] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0013] (1) In the present invention, a valve disc is hinged in the valve body to close the inlet of the branch pipeline when over-flow occurs. A hook is also hinged in the valve body to lock the valve disc to keep the branch pipeline unobstructed when over-flow does not occur. A trigger mechanism is provided on the outlet of the main pipeline to disengage the hook from the valve disc when over-flow occurs. When over-flow does not occur, the valve disc is locked on the hook and will not disengage, thereby not affecting the flow of the branch pipeline. When over-flow occurs, the trigger mechanism is pushed by the fluid and hits the hook, thereby disengaging the valve disc from the hook. Then, the valve disc instantly closes the end of the branch pipeline under the push of the fluid, reacting quickly to avoid excessive leakage of the fluid. The throttling orifice provided on the trigger mechanism can be designed in size according to different set flow rates.

[0014] (2) In the present invention, an elastic body is provided between the hook and the valve body to keep the hook locking the valve disc. This can effectively prevent the hook from being pushed by the fluid when no over-flow occurs, causing the hook and the valve disc to be accidentally disengaged, thereby enhancing reliability;

[0015] (3) The sealing ring provided between the trigger mechanism and the main line in the present invention enhances the sealing between the trigger mechanism and the main line, prevents the fluid from passing through the gap between the main line and the trigger mechanism, and reduces the error between the flow rate when the trigger mechanism is triggered and the designed flow rate; the flange provided on the trigger mechanism in the present invention for preventing the trigger mechanism from falling into the main line can prevent the trigger mechanism from falling into the main line during use, thereby preventing the over-flow automatic closing device from failing.

[0016] In summary, the present invention can quickly and automatically shut down the liquid flow in the controlled pipeline when an over-flow fault occurs in the controlled pipeline, thereby effectively preventing liquid loss when a fault occurs in the controlled pipeline, and also providing safety protection for pipeline maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0020] Figure 3 for Figure 1 A partial enlarged view of part B in the middle.

[0021] In the figure: 1-valve body, 2-main line outlet, 3-branch line, 4-valve disc, 5-hook, 6-trigger mechanism, 7-first through hole, 8-elastic body, 9-connecting flange, 10-connecting hole, 11-bolt, 12-sealing gasket, 13-sealing ring, 14-second through hole, 15-flange, 16-main line, 17-throttle orifice plate. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the super-flow automatic closing device described herein is a preferred embodiment, which is only used to illustrate and explain the present invention and does not constitute a limitation on the present invention. The directions or positional relationships indicated by "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like in this embodiment are based on the directions or positional relationships indicated in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0023] Example: Overflow automatic shut-off device

[0024] This embodiment Figure 1 — Figure 3 As shown, an over-flow automatic closing device includes a valve arranged between a main pipeline and a branch pipeline, the valve comprising a valve body and a locking mechanism and a trigger mechanism 6 assembled in the valve body;

[0025] The locking mechanism includes a valve flap 4 for closing the inlet of the branch pipeline 3 when an overflow occurs, and a locking unit for locking the valve flap 4 to keep the branch pipeline 3 unobstructed when an overflow does not occur. The valve flap 4 is provided in the valve body 1 at a position corresponding to the inlet of the branch pipeline 3. The upper end of the valve flap 4 is hinged to the inner wall of the valve body 1, and the lower end of the valve flap 4 contacts the upper end surface of the hook 5 of the locking unit. The hook 5 is L-shaped, and the upper end of the hook 5 is hinged to the inner wall of the valve body 1.

[0026] The trigger mechanism 5 is provided on the main pipe outlet 2 at the lower end of the hook 5. The trigger mechanism 5 is a hollow cylindrical shape. A first through hole 7 is formed on the trigger mechanism. The top of the trigger mechanism is a slope. The left side of the slope is higher than the right side of the slope. The left side of the slope corresponds to the left side of the bottom of the hook 5 (see Figure 1 ), a throttle orifice plate 17 is provided inside the trigger mechanism, and a second through hole 14 is formed on the throttle orifice plate. In actual use, the ratio of the surface area of ​​the throttle orifice plate 17 to the area of ​​the second through hole 14 can be designed according to the designed flow rate.

[0027] In order to prevent the hook 5 from accidentally disengaging from the valve disc 4 under the push of the fluid when the flow rate is not exceeded, an elastic body 8 is fixed between the lower part of the hook 5 and the valve body 1 to keep the hook 5 hooked to the valve disc 4 when the flow rate is not exceeded. In this embodiment, a constant force spring is used.

[0028] In this embodiment, in order to prevent the trigger mechanism 6 from falling into the main line 16, a flange 15 is fixedly provided on the upper end of the outside of the trigger mechanism 6. In order to prevent the fluid from leaking from the gap between the trigger mechanism 6 and the main line outlet 2, a sealing ring 13 is provided between the main line outlet 2 and the trigger mechanism 6.

[0029] In order to facilitate disassembly and assembly by operators, in this embodiment, a connecting flange 9 for detachable and sealed connection with the main pipe 16 is provided on the outside of the valve body 1, and connecting holes 10 are provided on the connecting flange 9. Six connecting holes 10 are evenly provided along the outer edge of the connecting flange 9, and six threaded holes matching the connecting holes 10 are provided on the main pipe 16. The connecting flange 9 and the main pipe are connected by bolts 11; in order to prevent fluid leakage from the gap between the connecting flange 9 and the main pipe 16 and enhance the airtightness between the connecting flange 9 and the main pipe 16, a sealing gasket 12 is provided between the connecting flange 9 and the main pipe.

[0030] When using this embodiment, first install the sealing ring 13 on the main line outlet 2; then install the trigger mechanism 6 on the main line outlet 2; then hook the valve disc 4 on the hook 5; then place the sealing gasket 12 between the connecting flange 9 and the main line 16, while aligning the higher inclined end of the trigger mechanism 6 with the hook 5 and aligning the connecting hole 10 with the threaded hole; finally, use the bolts 11 to fix the connecting flange 9 to the main line 16.

[0031] When no over-flow occurs, the trigger mechanism 6 does not move due to its own gravity and the friction between it and the sealing ring 13. At this time, the thrust generated by the fluid on the throttling orifice 17 is smaller than the friction between the trigger mechanism 6 and the sealing ring 13. The valve flap 4 is locked on the hook 5, and the branch pipeline 3 remains unobstructed.

[0032] When an over-flow occurs, the throttling orifice 17 generates an upward thrust on the trigger mechanism 6 under the push of the fluid. At this time, the thrust is greater than the trigger mechanism 6's own gravity and the friction between it and the sealing ring 13, so that the trigger mechanism 6 moves upward rapidly and hits the hook 5 and compresses the elastomer 8, thereby causing the hook 5 to instantly disengage from the valve disc 4. Finally, the valve disc 4 closes the inlet of the branch pipeline 3 under the push of the fluid.

Claims

1. An over-flow automatic closing device, comprising a valve arranged between a main pipeline and a branch pipeline, characterized in that: The valve is composed of a valve body, a locking mechanism and a trigger mechanism assembled in the valve body; The locking mechanism includes a valve flap for closing the inlet of the branch pipeline when an over-flow occurs, and a locking unit for locking the valve flap to make the branch pipeline unobstructed. The valve flap is arranged in the valve body at a position corresponding to the inlet of the branch pipeline. The upper end of the valve flap is hinged to the inner wall of the valve body, the lower end of the valve flap contacts the locking surface of the locking unit, and the upper end of the locking unit is hinged to the inner wall of the valve body. The trigger mechanism is arranged at the main pipe outlet at the lower end of the locking unit. The trigger mechanism is a hollow cylindrical structure, and its top end corresponds to the trigger control surface of the locking unit. A throttling orifice plate is fixed on the trigger mechanism, and the throttling orifice plate is fixed on the inner wall of the hollow column. The locking unit is composed of a hook and an elastic body used to keep the hook in a locked valve flap state, the upper part of the hook is hinged to the inner wall of the valve body, and the elastic body is arranged between the lower part of the hook and the valve body; The hook has an "L" shape, with a ratchet at its lower end, the upper end surface of the ratchet being the locking surface of the valve disc, and the lower end surface of the ratchet being the trigger control surface; A first through hole is formed on the trigger mechanism, and the top of the first through hole is an inclined surface, the left side of the inclined surface is higher than the right side of the inclined surface, and the left side of the inclined surface corresponds to the left side of the bottom of the hook.

2. The super-flow automatic closing device according to claim 1, characterized in that: A sealing ring is arranged between the trigger mechanism and the main pipe.

3. The super-flow automatic closing device according to claim 2 is characterized in that: The outside of the trigger mechanism is provided with a flange for preventing the trigger mechanism from falling into the main pipe, and the flange is arranged at the upper end of the trigger mechanism.

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