Novel shaft seal structure for shell

Abstract

The invention discloses a novel shaft seal structure for a shell. The novel shaft seal structure comprises a cover plate and carbon ring seal, wherein the cover plate is integrated; the cover plate isconnected with the rear side plate of the shell through a stud; the carbon ring seal comprises a connection plate and a box body; the connection plate is integrated; the cover plate and the connection plate sleeve in a main shaft before installation for an impeller; the box body is of a top-bottom split structure; and site welding is carried out on the carbon ring seal and the cover plate. With regard to the existing large centrifugal fan, in order to facilitate installation and maintenance for a rotor, a shell is of a split structure, and a sealing material at the half of a shell body is easily damaged during the site welding for the carbon ring seal at a shaft hole previously; in order to facilitate site adjustment, a gap exists between the carbon ring seal and a half flange, and gas leakage is easily caused; and meanwhile, in order to facilitate the later rotor maintenance, the connection plate needs to be broken in the direction of the half of the shell, and gas leakage is also easily caused at the broken part. According to the novel shaft seal structure disclosed by the invention, the cover plate is added between the shell and the carbon ring seal, and the cover plate and theconnection plate are of an integrated structure, so that the problem of gas leakage is greatly solved.

Description

technical field [0001] The invention relates to the technical field of centrifugal fans, in particular to a novel casing shaft seal structure. Background technique [0002] With the advancement of my country's industrialization process, the industrial sector is vigorously carrying out energy conservation and consumption reduction, industrial upgrading and integration and reorganization, and industrial infrastructure equipment needs a large number of updates. Centrifugal fans, as important supporting equipment in industry, will be more widely used in fields such as electric power, cement, petrochemical, coal, mining and environmental protection. Under the new economic development situation, the centrifugal fan industry will continue to maintain rapid growth in the future. [0003] Centrifugal fans are widely used in the ventilation of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, the ventilation and induction of boilers and industrial furnaces, th...

AI Technical Summary

Problems solved by technology

[0004] The main structural components of the centrifugal fan are the impeller, casing, and main shaft. The impeller is inside the casing, and the transmission shaft needs to go through the inner hole of the casing to extend into the interior and connect with the impeller. Since there is a gap between the inner hole of the casing and the transmission shaft, here It is the place where air leakage is most likely, so the quality of the seal here will directly affect the degree of gas leakage. At present, the carbon ring sealing structure is widely used, and the sealing structure is welded on site after adjusting the position during assembly, which is easy to damage the surrounding area. Sealing rope, and there is still a gap around the shaft seal in this structure, there will be a small amount of gas leakage, so a new casing shaft seal structure is required to replace

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