Two-way pneumatic hot air shutoff gate

Abstract

The invention discloses a two-way pneumatic hot air shutoff gate and solves the problem that the conventional shutoff gate is not applicable to large units. The two-way pneumatic hot air shutoff gate is characterized in that two partition gates are combined together, wherein a cooling air inlet and an emergency pull rod are arranged on each partition gate, and a limit indicator is arranged on one driving cylinder; an ash discharge pipe is arranged in a framework; a gate opening booster can be further arranged at a joint of the two partition gates. Double cylinders are adopted to drive each gate sheet, the gate sheet is closed and locked gradually through automatic track transferring motion, large thrust output is realized, the control is flexible, the operation is stable, and sealing is tight; ash accumulation on tracks and a sealing surface is prevented by the aid of the ash discharge pipe; a pneumatic driving device opens or closes the gate and locks the gate sheets, opening and closing are flexible, reverse thrust compensation is realized by the gate opening booster when the gate is opened, and jamming is prevented; the two-way pneumatic hot air shutoff gate is simple in system, low in energy consumption, stable in operation, simple to operate and the like, fundamentally solves the problems of untight and non-flexible opening and closing, high probability of getting stuck, serious leakage and the like of other shutoff gates, and is particularly suitable for large thermal generator sets.

Description

technical field [0001] The present invention relates to a partition device, more particularly to a shut-off door. Background technique [0002] The hot blast shut-off door is installed on the hot blast pipeline at the outlet of the air preheater in the thermal power plant, and is used to open and cut off the hot blast. It is mainly used for on-line maintenance of coal mills to isolate hot air, avoiding hot air at the outlet of the preheater from injuring maintenance personnel, and ensuring smooth progress of coal mill maintenance. [0003] The applicant has applied for a patent named flapper valve (patent application number 2014108211829), which includes a valve body in the form of a frame structure. A plate-type valve plate is set at the pipe joint between the two nozzles, and the valve plate reciprocates and is in two positions of connecting or closing the two nozzles. A cylinder that drives the valve plate to reciprocate is connected between the valve body and the valve ...

AI Technical Summary

Problems solved by technology

However, for a 1000MW large-scale unit, the air duct is relatively large, with a general cross-section of 2.2×1.8m, and the temperature difference between the two sides of the partition door is very large, and one side is 300 0 C, 20-40 on one side 0 C, the door panel is easily deformed

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