Electric emergency cut-off valve

Abstract

The invention relates to an electric urgent shutoff valve for a blast furnace system. The valve comprises a butterfly valve; a main shaft supporting seat of one side of the butterfly valve is provided with a transmission supporting seat of which the upper part is assembled with electromagnetic adsorbed iron; the outer side of the transmission supporting seat is provided with a weight balancing device of which the upper part is assembled with an electromagnetic induction disc and a weight balancing sheet; the lower part of the weight balancing device is provided with an axle hole matched with a main shaft of the butterfly valve and is provided with a connecting disc taking the main shaft of the butterfly valve as axle center; the outer side of the weight balancing device connected with theconnecting disc is provided with an electric device; the electric device consists of a motor assembled on the upper part and a worm wheel speed reducer; an output worm wheel of the worm wheel speed reducer is connected with a main shaft key of the butterfly valve; the lower part of the transmission supporting seat is provided with a hydraulic buffering device; and the lower part of the weight balancing device corresponding to the position of the hydraulic buffering device is provided with a buffering bump block. Under the normal condition, the electric urgent shutoff valve has the same opening or closing function as the routine shutoff valve; and under the accidental condition, the electric urgent shutoff valve can realize the urgent shutoff of the valve within three seconds which is required by a safety system.

Description

technical field [0001] The invention relates to a valve for a blast furnace system, in particular to an electric emergency shut-off valve capable of automatic emergency shut-off when an accident occurs in the blast furnace system. Background technique [0002] The emergency cut-off valve is a necessary equipment in the blast furnace gas pipeline. During the blast furnace ironmaking process, all gas must pass through the emergency shut-off valve. When the blast furnace is running normally, the emergency shut-off valve is open; when an accident occurs in the blast furnace, the emergency shut-off valve must be closed quickly to isolate the gas from the hot blast stove (or TRT system turbine) to ensure that the blast furnace (or turbine) safety. [0003] The emergency cut-off valve in the prior art is composed of a butterfly valve and a hydraulic cylinder with a counterweight. Since the hydraulic oil in the hydraulic cylinder must be discharged quickly within 3 seconds requir...

AI Technical Summary

Problems solved by technology

Since the hydraulic oil in the hydraulic cylinder must be discharged quickly within 3 seconds required by the safety system, the valve can realize the emergency shutdown required by the safety system. In fact, it is difficult to do so. The shutdown time is far more than 3 seconds, and its reliability is very poor, which directly affects the safety of the system

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