High temperature large-caliber flue gas pipeline inlet airtight device used in cement industry

Abstract

The invention discloses a high temperature large-caliber flue gas pipeline inlet airtight device used in cement industry. The airtight device comprises a valve body, a valve cover, an actuating arm assembly, a bearing part, a pin shaft, a sealing part, a driving part, a high temperature resistant layer and a pressure relief part; an inclined sealing surface is arranged at the inner opening of the valve body; a mounting groove is arranged on the upper end surface of the valve body; the sealing part is arranged in the mounting groove; the high temperature resistant layer is lined on the inclined sealing surface and the inner wall of the mounting groove; the high temperature resistant layer is lined on the inclined sealing surface and a lower plane in contact with the sealing part; the valve cover is connected with the actuating arm assembly via the pin shaft; a pin shaft hole is U-shaped; the pressure relief part is installed on the valve cover; the pressure relief part comprises a pressure relief part valve cover connected with the actuating arm assembly; the actuating arm assembly is connected with the bearing part; and the bearing part is connected with the driving part. The airtight device relieves the pressure firstly, reduces the acting force of the negative pressure to the valve cover, save manufacturing cost, and has safe and reliable structure and good sealing property.

Description

technical field [0001] The invention relates to a sealing device for a flue gas discharge port, in particular to a sealing device for the inlet of a high-temperature and large-diameter flue gas pipe used in the cement industry. Background technique [0002] The working environment temperature of the high-temperature and large-diameter flue gas pipe inlet airtight device used in the cement industry is above 550°C, and the external leakage requirement is very high, generally 0-0.3%, and the diameter is large (generally above 2000mm, up to 5000mm). Currently, it is usually used Welded high-temperature ventilation butterfly valves are used instead, but the leakage rate of ventilation butterfly valves is very large, between 1.5% and 2.5%, which cannot meet the low leakage requirements; It is negative pressure, the medium in the pipeline has a suction force on the valve cover, the larger the pipeline area, the greater the suction force, the greater the negative pressure, the great...

AI Technical Summary

Problems solved by technology

[0002] The working environment temperature of the high-temperature and large-diameter flue gas pipe inlet airtight device used in the cement industry is above 550°C, and the external leakage requirement is very high, generally 0-0.3%, and the diameter is large (generally above 2000mm, up to 5000mm). Currently, it is usually used Welded high-temperature ventilation butterfly valves are used instead, but the leakage rate of ventilation butterfly valves is very large, between 1.5% and 2.5%, which cannot meet the low leakage requirements; It is negative pressure, the medium in the pipeline has a suction force on the valve cover, the larger the pipeline area, the greater the suction force, the greater the negative pressure, the greater the suction force, so the required opening force is large, the greater the opening and closing force, the higher the cost of the driving parts

At present, there is a lack of a high-temperature large-diameter flue gas pipe inlet special sealer with strong high-temperature resistance, reliable sealing, and high cost performance.

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