A Pilot Valve for Pneumatic Ash Conveying

Abstract

The invention discloses a pneumatic ash transport throttle anti-blocking grinding pilot valve. A valve body is internally provided with a blockage blowing cavity, an air inlet cavity and a piston operating cavity, and the blockage blowing cavity is in fluid communication with the air inlet cavity through an air inlet; the piston operating cavity is internally provided with a first piston; the piston operating cavity is divided into a piston driving cavity and a piston exhaust cavity through the first piston, and the piston driving cavity and the piston exhaust cavity are sealed mutually; the first end of a piston driving rod is fixedly connected with the first piston; the blockage blowing cavity is in fluid communication with a blockage blowing channel and a chain blockage blowing and airsupply channel separately, and the chain blockage blowing and air supply channel is in fluid communication with a chain blockage blowing judgment mechanism; and the chain blockage blowing and air supply channel is in fluid communication with the piston driving cavity through the chain blockage blowing judgment mechanism. The chain blockage blowing judgment mechanism arranged in the pilot valve canbe used for judging whether the pilot valve in the front of an ash transport pipe needs to be opened or not according to the actual pressure change condition of the ash transport pipe, and the used amount of blockage blowing air is reduced; the situation that air is blown largely due to chain reaction of the pilot valve is avoided; and the consumption of the blowing air can be reduced on the premise of dredging a blocking point effectively.

Description

technical field [0001] The invention relates to the technical field of pneumatic ash conveying. Specifically, it is a pilot valve for pneumatically conveying ash, solar term, anti-blocking and anti-grinding. Background technique [0002] During the process of pneumatic ash conveying, the pilot valve supplies a small amount of gas to the ash conveying pipe through the plugging port under normal ash conveying state. When the ash conveying pipe is blocked, the piston of the pilot valve drives the air pressure in the chamber to rise and drive the piston to move. Open the air inlet so that the air inlet and the blowing plugging port are connected, so that a large amount of gas will be supplied to the ash conveying pipe through the blowing plugging port to clear the blockage in front, and the blowing plugging port of the rear pilot valve and the piston of the front pilot valve The drive cavity is connected, so that when the rear pilot valve supplies a large amount of air to the a...

AI Technical Summary

Problems solved by technology

[0003] Although this kind of pilot valve in the prior art has achieved good blockage control effect in practical applications, its defects are also very obvious: firstly, a large number of pilot valves that supply air to the ash conveying pipe and all the pilot valves in front of them are supplied to the conveying pipe. A large amount of air is supplied to the ash pipe, and the clogging point may be only between the pilot valve that first supplies a large amount of air to the ash conveying pipe and the first pilot valve in front of it, and the ash conveying pipe ahead of the second pilot valve in front is not Blockage, which makes the chain reaction to supply a large amount of gas to the ash conveying pipe to cure the blockage, and the gas consumption is very large

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