Normal temperature large-caliber flue gas pipeline inlet sealer for cement industry

Abstract

The invention discloses a normal temperature large-caliber flue gas pipeline inlet sealer for a cement industry. The normal temperature large-caliber flue gas pipeline inlet sealer comprises a valve body, a valve cover, a force arm component, a supporting part, a pin shaft, a sealing piece, a driving part and a pressure relief part, wherein a sealing slope is arranged at an inner opening of the valve body; a mounting groove is formed in the upper end surface of the valve body; the sealing piece is arranged in the mounting groove; the valve cover is connected with the force arm component by the pin shaft; a pin shaft hole is a U-shaped pin hole; the pressure relief part is mounted on the valve cover; the pressure relief part comprises a pressure relief part valve cover; the pressure relief part valve cover is connected with the force arm component; the force arm component is connected with the supporting part; and the supporting part is connected with the driving part. According to the invention, the pressure is first relieved to reduce an acting force of negative pressure on the valve cover, so that a desired opening force is reduced and a desired output force of the driving part is reduced; which lowers the manufacturing cost.

Description

technical field [0001] The invention relates to an airtight device for the inlet of a flue gas pipe, in particular to an airtight device for the inlet of a large-diameter flue gas pipe at room temperature for the cement industry. Background technique [0002] The working environment temperature of the large-diameter flue gas inlet sealer used in the cement industry at room temperature is 0°C-500°C, and the external leakage requirements are very high, generally 0-0.3%, and the diameter is large (generally above 2000mm, up to 5000mm). Welded ventilation butterfly valves are usually used instead, but the leakage rate of ventilation butterfly valves is very large, generally between 1.5% and 2.5, which cannot meet the low leakage requirements; if the special sealer for the outlet of large-caliber smoke and gas pipes at room temperature can meet the sealing requirements, However, because of the negative pressure, the medium in the pipeline has a suction force on the valve cover. T...

AI Technical Summary

Problems solved by technology

[0002] The working environment temperature of the large-diameter flue gas inlet sealer used in the cement industry at room temperature is 0°C to 500°C, and the external leakage requirements are very high, generally 0 to 0.3%, and the diameter is large (generally above 2000mm, the maximum can reach 5000mm). Welded ventilation butterfly valves are usually used instead, but the leakage rate of ventilation butterfly valves is very large, generally between 1.5% and 2.5, which cannot meet the low leakage requirements; if the special sealer for the outlet of large-caliber smoke and gas pipes at room temperature can meet the sealing requirements, However, because of the 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 and the greater the negative pressure, 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 special sealer for the inlet of large-diameter flue gas pipes at room temperature with reliable sealing and high cost performance.

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