A passive mechanical quick-cut valve for gas blending

Abstract

The invention discloses a passive mechanical quick switching-off valve used in a coal mine gas mixing process. The aims of safety, rapidness and linked switching off of high concentration extracted gas in the gas mixing process in a thermal storage oxidation device and a waste heat recycling system of the thermal storage oxidation device are achieved. The passive mechanical quick switching-off valve is opened by rotating a gear disc through a rocker, pushes a nonmetal elastic membrane through positive pressure guided air to drive a locking rod to lock the gear disc, and enables a valve plate to be in the opening state; and when air at an outlet of an air blower losses pressure, the membrane drives a multi-connecting-rod mechanism under the effect of a reset spring to unlock the gear disc, and the valve is closed through the valve plate under the torque effect of a torsional spring. The core function of the valve is safe and synchronous switching off, the passive manner and the pure mechanical motion are achieved, intervention of external energy in the process is avoided, and unreliability of a complex system composed of a PLC and electricity, liquid and gas driving mechanisms is avoided; and the guided air is used for locking the valve, the manual operating participation degree is reduced, and misoperation is avoided.

Description

technical field [0001] The invention relates to a safe, fast and interlocking cut-off device when two different concentrations of gases are mixed, in particular to the interlocked cut-off of higher-concentration extraction gas and extremely low-concentration ventilation gas during the gas mixing process of a thermal storage oxidation device and a waste heat utilization system. Background technique [0002] The ventilation gas oxidation process often needs to be mixed with a certain high concentration of extraction gas, and the reliable cut-off of extraction gas is directly related to the safe operation of the oxidation device. Generally, in the industry, a control system consisting of a cut-off valve (electric, hydraulic or pneumatic), flow meter, concentration detector, and PLC can be used to control the supply and cut-off of the drainage gas, so as to avoid the high-concentration drainage when the ventilation gas supply is stopped. The deflagration accident caused by the c...

AI Technical Summary

Problems solved by technology

If the air pressure at the outlet of the fan is directly linked to the opening of the mechanical shut-off valve, the omissions in this safety inspection and troubleshooting link will inevitably bury safety hazards for production

[0005] To sum up, one of the current blending methods is actively adjusted by the control system, which is suitable for general industrial processes. The procedure is relatively complicated, and there are safety hazards in equipment reliability, strategy design, and human operation accuracy; There is still the safety problem of wind pressure direct linkage valve opening

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