Leakage-free hydraulic buffering vacuum breaker valve

Abstract

The invention provides a leakage-free hydraulic buffering vacuum breaker valve. According to the vacuum breaker valve, a hydraulic cylinder and the valve plate are arranged, wherein the hydraulic cylinder is installed on the valve plate and acts together with the valve plate, a sliding seal between the bottom of the hydraulic cylinder and a valve rod is located inside a hydraulic buffering cavity,so that complete sealing in the hydraulic cylinder is guaranteed, hydraulic buffer oil is in a completely sealed state, sealing abrasion leakage is avoided, and the service life of the vacuum breakervalve is prolonged; moreover, a throttling valve is arranged, the buffering effect of the valve plate in the closing position is improved, noise generated through collision of the valve plate and a valve seat is reduced, a supporting sleeve plays a role in supporting the hydraulic cylinder, and further balances radial force of opening and closing of the valve plate so as to prolong the fatigue life of the vacuum breaker valve, meanwhile, a spring is arranged, so that axial force is balanced; and in addition, the vacuum breaker valve is simple in structure, reasonable in design, safe and reliable, and potential safety hazards during operation of a water turbine are effectively reduced.

Description

technical field [0001] The invention provides a non-leakage hydraulic buffer vacuum breaking air supply valve, which belongs to the technical field of water turbine equipment. Background technique [0002] At present, the air supply device installed in the turbine often adopts hydraulic buffer. The hydraulic cylinder is fixed on the valve body, the valve stem is fixed on the valve plate, and the hydraulic cylinder is filled with hydraulic oil. It moves together with the valve plate, and the hydraulic oil buffers the speed of the valve plate to ensure that the valve plate and the valve seat do not collide strongly when the air is frequently supplied. [0003] Since the valve stem and the valve plate are connected and move together, the matching part between the bottom of the hydraulic cylinder and the valve stem must be equipped with a movable seal. After a period of operation, the seal will inevitably wear out, and the hydraulic oil in the hydraulic cylinder will gradually l...

AI Technical Summary

Problems solved by technology

[0003] Since the valve stem and the valve plate are connected and move together, the matching part between the bottom of the hydraulic cylinder and the valve stem must be equipped with a movable seal. After a period of operation, the seal will inevitably wear out, and the hydraulic oil in the hydraulic cylinder will gradually leak outside. When the hydraulic oil in the hydraulic cylinder After all leaks, the cushioning function of the air supply device will fail, and when the work continues, the valve plate and the valve seat will have a strong metal impact, which will not only generate strong noise, but also accelerate the damage of components, and at the same time bring safety hazards to the operation of the turbine

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