Quick opening and closing valve with scissor fork structure

Abstract

The invention relates to a shear fork structure quick opening and closing valve which comprises a valve body, a valve rod arranged on the valve body, an opening and closing piece and a driving device, the driving device drives the valve rod to linearly ascend and descend, the shear fork structure quick opening and closing valve further comprises a first X-shaped transmission set located on the upper portion and a V-shaped transmission set located on the lower portion, and the first X-shaped transmission set comprises two first transmission rods arranged in an X shape; a first hinge shaft which ascends and descends synchronously with the valve rod and enables the two first transmission rods to be hinged is arranged at the crossed position of the two first transmission rods, the valve body is provided with a guide part for the upper ends of the first transmission rods to move transversely, the V-shaped transmission set is composed of two second transmission rods placed in a V shape, and the crossed position of the two second transmission rods is hinged to an opening and closing part. The upper ends of the second transmission rods and the lower ends of the first transmission rods are in one-to-one linkage arrangement and are opened and closed synchronously. By adopting the scheme, the invention provides the quick opening and closing valve with the scissor fork structure, which shortens the opening and closing time of the valve by shortening the stroke of the valve rod.

Description

Technical field [0001] The present invention relates to the field of straight-stroke opening and closing valves, specifically to a scissor structure fast opening and closing valve. Background [0002] Straight-line travel opening and closing valve refers to the valve who moves the stem along a straight path, such as gate valve, plug valve, globe valve, etc. When opening or closing the valve, the drive device drives the valve nut at the top of the valve to rotate, and then drives the valve stem that cooperates with the nut thread to lift and lower, thereby driving the lifting and closing parts, because it adopts the structural form of thread transmission, so it is difficult to improve the valve opening and closing speed. [0003] In order to solve the above problems, the top of the valve is equipped with a linear actuator (such as pneumatics, hydraulic devices, etc.) to drive the stem lifting, eliminating the structural form of the thread transmission, thereby improving the valve ...

AI Technical Summary

Problems solved by technology

When opening or closing the valve, the driving device drives the valve nut on the top of the valve to rotate, and then drives the valve stem that is threaded with the nut to rise and fall, thereby driving the opening and closing parts to rise and fall. Because of the structure of screw transmission, it is difficult to improve the valve opening and closing. speed

[0003] In order to solve the above problems, a linear actuator (such as pneumatic, hydraulic device, etc.) is equipped on the top of the valve to drive the valve stem up and down, which saves the structural form of screw transmission, thereby increasing the speed of valve opening and closing, but the working stroke of the valve stem is still different from the traditional one. The structure is consistent, so the increased opening and closing speed is still limited

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