Pulse back-flushing valve

Abstract

The invention belongs to the field of dust removal and particularly relates to a fireproof high-frequency high-temperature and high-pressure pulse back-flushing valve for conducting back-flushing cleaning on a filter element. According to the technical scheme, in the back-flushing valve, a valve rod is in mortise joint fit with a valve clack, and a mortise or a tongue-and-groove used for mortise joint fit is in a closing-in shape, and an elastic vibration damping part is arranged at the mortise joint surfaces of the valve rod and the valve clack. According to the pulse back-flushing valve, the valve rod is in mortise joint fit with the valve clack, and the elastic vibration damping part is arranged at the mortise joint surfaces of the valve rod and the valve clack, so that the valve clack has the characteristic of a check valve and the self-sealing characteristic on a flow closed condition; the valve clack and a valve seat are sealed more reliably, and the influence of the assembly quality on the sealing performance of the pulse back-flushing valve is reduced; meanwhile, the valve rod is in mortise joint fit with the valve clack, so that the problem of disengagement, caused by hard connection, of a valve rod and a valve clack in the prior is avoided. The elastic vibration damping part at the mortise joint contact surfaces of the head of the valve rod and the valve clack can remarkably relieve vibration shock of the pulse back-flushing valve on a high-frequency quick switching working condition.

Description

technical field [0001] The invention belongs to the field of dust removal, and in particular relates to a fire-proof high-frequency high-temperature and high-pressure pulse back-blowing valve for back-blowing and cleaning filter cores. Background technique [0002] In the dry pulverized coal gasification process, the syngas needs to be dry-ashed through a high-temperature and high-pressure ceramic filter. In order to realize the backflushing cleaning of the filter element, it is necessary to provide a valve that can switch frequently and quickly and generate pulsed air flow under the condition of high temperature and high pressure gas. Existing pulse blowback valves generally include a driving mechanism, a valve stem, and a valve body, wherein one end of the valve body is connected to the valve cover, the other end of the valve body is connected to the valve seat, one end of the valve stem is connected to the driving mechanism, and the other end of the valve stem is connecte...

AI Technical Summary

Problems solved by technology

Engineering practice shows that there are many problems in the valves used in the existing process, the valve assembly accuracy is high, the sealing reliability of the valve is poor after long-term use, the valve stem vibrates greatly during the valve working process, the valve disc is easy to loose, and it is inconvenient to disassemble and maintain

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