Fan

Abstract

The invention discloses a fan, which comprises a fan shell, a motor and an impeller, wherein the rear end of the fan shell is provided with the motor; the impeller is arranged in the fan shell and is connected with an output shaft of the motor; the impeller comprises a front cover plate, a rear cover plate and blades; a plurality of blades are arranged between the front cover plate and the rear plate in an annular array, are vertically arranged between the front cover plate and the rear plate and have an arc shape; and a connecting extension line between the center of the outer sides and the center of the inner sides of the blades penetrates through the center of a circle of the front cover plate and the rear cover plate. By the fan, in the gas exhaust process, airflow in a deviation direction is not generated, and the exhaust loss of the fan is avoided; and meanwhile, the probability of causing gas turbulence or vortex under external disturbance is reduced, fatigue crack of the blades of the impeller or a resonance phenomenon of the impeller is avoided, the phenomenon that the blades of the impeller are broken is avoided, the shutdown maintenance time of the fan is shortened, and the exhaust efficiency of the fan is improved.

Description

technical field [0001] The invention relates to a blower fan, in particular to a blower fan which does not generate an air flow in a deviated direction during the process of discharging gas. Background technique [0002] The fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. The fan generally includes a fan casing, a motor and an impeller. The rear end of the fan casing is equipped with a motor, and the impeller is arranged in the fan casing and connected with the output shaft of the motor. The purpose of exhaust gas. In the past, the blades of the impeller were arranged between the front plate cover and the rear plate cover, and there would be a certain deviation between the blades relative to the center of the front and rear plate covers. In addition to the airflow direction of the exhaust, there will also be an airflow in a deviated direction, which will cause the loss of fan exha...

AI Technical Summary

Problems solved by technology

In the past, the blades of the impeller were arranged between the front plate cover and the rear plate cover, and there would be a certain deviation between the blades relative to the center of the front and rear plate covers. In addition to the airflow direction of the exhaust, there will also be an airflow in a deviated direction, which will cause the loss of fan exhaust; at the same time, although the deviated airflow generated is small, it will cause gas turbulence or vortex under the condition of external interference. probability, the impeller blades are prone to fatigue cracks, or the resonance phenomenon of the blades. In severe cases, the blades will break, which increases the maintenance time of the fan and reduces the exhaust efficiency of the fan.

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