Sealing device for hot air door shaft of boiler coal pulverizer

Abstract

The invention discloses a sealing device for a hot air door shaft of a boiler coal pulverizer. The sealing device comprises a door shaft sleeve fixing seat, a wear resistant sleeve, an inner wear resistant sleeve, an outer sealing sleeve, and a tensioning component, wherein the door shaft sleeve fixing seat is arranged on a door shaft in a sleeving manner; the wear resistant sleeve is arranged onthe door shaft in a sleeving manner; the bottom of the wear resistant sleeve is embedded in an upper cylinder opening of the door shaft sleeve fixing seat; the inner seal sleeve is arranged on the topof the wear resistant sleeve in a sleeving manner, and is fixedly connected with the door shaft sleeve fixing seat; a plurality of sealing rings are embedded on the outer peripheral wall of the innersealing sleeve at intervals; the top of the outer sealing sleeve is arranged on the door shaft in a sleeving manner; the bottom of the outer sealing sleeve is arranged on the outer sides of the sealing rings in a sleeving manner; the tensioning component is arranged on the door shaft in a sleeving manner; the bottom end of the tensioning component is embedded in an upper cylinder opening of the outer sealing sleeve, and is fixedly connected with the outer sealing sleeve; a labyrinth sealing structure is formed among the inner sealing sleeve, the sealing rings and the outer sealing sleeve; andthe sealing effect is good.

Description

technical field [0001] The invention relates to the technical field of sealing devices, in particular to a door shaft sealing device for a hot air door of a boiler coal mill. Background technique [0002] At present, graphite packing packing is used to seal between the air duct door and the door shaft of the coal mill. However, when the air duct door is used for a period of time, due to frequent opening and closing, and the interior of the air duct is a high-temperature medium, the graphite plate is caused by high temperature. The moisture inside the root packing loses its elasticity due to evaporation, which makes the graphite packing at the door shaft prone to ageing and deformation, which shortens the service life of the graphite packing, and further causes the gap between the door shaft and the graphite packing. A gap is generated. Under the action of the air duct pressure, the medium in the air duct overflows from the gap between the door shaft, resulting in air leakage...

AI Technical Summary

Problems solved by technology

[0002] At present, the air duct door and the door shaft of the coal mill are mostly sealed with graphite packing. However, after the air duct door has been used for a period of time, due to the frequent opening and closing, and the high temperature medium inside the air duct, the graphite disc will be damaged due to the high temperature. The moisture inside the root packing evaporates and loses its elasticity, which makes the graphite packing at the door shaft part prone to aging and deformation, shortening the service life of the graphite packing, and furthermore, the gap between the door shaft and the graphite packing A gap is generated, and under the pressure of the air duct, the medium in the air duct overflows from the gap of the door shaft, resulting in air leakage and dust leakage

Images