Mechanical linkage shut-off valve

Abstract

The invention provides a mechanical linkage cut-off valve. The mechanical linkage valve comprises a first valve, a second valve, a lever linkage mechanism and a driving device, wherein the first valve and the second valve are mechanical two-position and three-way valves, and are arranged in parallel; the lever linkage mechanism comprises a pivot seat; the first end of the lever is connected with a connecting rod of the first valve; the second end of the lever is connected with a connecting rod of the second valve; the pivot of the lever positioned between the first end and the second end is supported on the pivot seat; the driving device is used for driving the lever to switch between a left side inclination state and a right side inclination state; the action directions of valve plates of the first valve and the second valve are reverse. The mechanical linkage valve is applied to a heat-accumulating oxidizing device, so that a ventilation gas pipeline and a gas pumping pipeline can be switched off synchronously, omission caused by manual operation and remote control is avoided, and the cut-off reliability of gas pumping and the safety of a system are enhanced.

Description

technical field [0001] The invention relates to the technical field of valves in the mechanical industry, in particular to a mechanical linkage shut-off valve. Background technique [0002] For a long time, coal mine ventilation gas has low methane concentration (<0.75%), difficult enrichment, large gas volume, and difficult utilization technology. Therefore, it is generally directly discharged into the atmosphere and rarely recycled. Regenerative ventilation gas oxidation technology is considered to be an important and most promising gas emission reduction and utilization technology for dealing with coal mine ventilation gas and reducing greenhouse gas emissions. Through the heat storage body, the ventilation gas is preheated and the methane in it is oxidized to release heat; the excess heat released by methane oxidation is taken out and utilized through the waste heat recovery and utilization system. [0003] Considering the long-term, stable and effective operation of...

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Problems solved by technology

[0004] Blending a certain amount of high-concentration (20-30%) pumping gas into the low-methane concentration ventilation gas inevitably has the following problems: how to realize safe blending, and ensure that when the system fails, the low-methane concentration ventilation gas is cut off. Higher concentration pumping gas is cut off at the same time, so as to ensure that methane does not accumulate, so that its concentration is in a safe range (the explosion limit of methane in air is about 5% to 15%, and the blending device usually sets the upper limit of its concentration after blending 1.2%)

[0006] However, the above-mentioned control method is limited to the reliability of control signals and electric valves, and this remote control method increases human judgment and complex interlocking control strategies and operation steps. Operation errors will easily cause the accumulation of gas in the pumping and drainage, and the concentration of methane will increase and decrease. To ensure the reliability and safety of the operation of the ventilated gas oxidation device

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