Axial flow type fire-fighting smoke exhaust fan

Abstract

The invention discloses an axial flow type fire-fighting smoke exhaust fan. The axial flow type fire-fighting smoke exhaust fan comprises an enclosure and an impeller, wherein the diameter of the impeller is D and the diameter of a motor barrel is d; the enclosure is internally provided with a rectification cover and a rectification body; the rectification cover is fixed at the front end of the impeller; the rectification body is fixed at the rear end of the motor barrel; the rectification cover is semi-spherical, the radius (R) is equal to 0.25-0.35D and the length (L) is equal to 0.1-0.15D; the rectification body is in a butt conical shape and is gradually reduced along the direction of an air outlet; the conical half angle (alpha) is equal to 18-25 degree and the length (L1) is equal to 0.58-0.7d; the end part of the rectification body is in a circular arc shape; the central lines of the rectification cover and the rectification body are overlapped with the axis of the enclosure. According to the axial flow type fire-fighting smoke exhaust fan, the rectification cover and the rectification body are arranged at an air inlet and the air outlet in the enclosure so that the air inlet condition is more complete and the noises of the draught fan are reduced; an airflow channel of the inlet of the axial flow type fire-fighting smoke exhaust fan is formed by the rectification cover mounted in front of the impeller; by the aid of the rectification cover, the flow of the draught fan can be improved by about 10%.

Description

technical field [0001] The invention relates to the technical field of ventilation equipment, in particular to an axial-flow fire-fighting and smoke-exhausting fan. Background technique [0002] Axial flow fans are widely used. The air flow of axial flow fans is in the same direction as the axial direction of the blades. For example, electric fans and air conditioner external fans are axial flow fans. It is called "axial flow" because the gas flows parallel to the shaft of the fan. Axial flow fans are usually used in applications with high flow requirements and low pressure requirements. Axial flow fans fix the position and move the air. The structure of the axial flow fan is simple but the data requirements are very high. Ordinary axial flow fans can be used for ventilation in general factories, warehouses, offices, residences, etc., and can also be used for air coolers (air coolers), evaporators, and condensers. , spray drop, etc. There are also mining axial flow fans, wh...

AI Technical Summary

Problems solved by technology

[0004] Based on the deficiencies in the prior art, the present invention solves the technical problems of poor air inlet conditions and low static pressure efficiency of the axial-flow fire-fighting smoke exhaust fan

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