Air blowing device

Abstract

The invention discloses an air blowing device. The air blowing device comprises a main machine shell, a motor, a fan, a switch and an air blowing pipe, wherein the motor is arranged in the main machine shell, the fan is driven to rotate by the motor, the switch controls the motor to be opened and closed, the air blowing pipe is connected with the main machine shell, the air blowing pipe comprises an air inlet end close to the fan and an air outlet end far away from the fan, and the inner wall of the air blowing pipe is provided with at least two spiral curved surfaces which stretch from the air inlet end to the air outlet end and are mutually wound. Airflow in the air blowing pipe can be effectively guided by the spiral curved surfaces, the airflow is enabled to do regular rotating flow, thus the airflow blown out from the air outlet end can be stable and uniform, a blowout phenomenon is avoided, and the effect of blowing branches and leaves is improved; in addition, the inherent frequency of the air blowing pipe is increased by a spiral structure, the excitation frequency of the airflow is avoided, thus the possibility of generating resonance is removed, the holding comfortable degree of a user is improved, and the utilization rate of the air blowing device is increased.

Description

technical field [0001] The invention relates to a blowing device, in particular to a blowing device with a blowing pipe. Background technique [0002] The blowing device is an outdoor cleaning tool, which mainly blows grass clippings, branches and leaves, branches and other garbage on the ground into a pile by blowing, so as to facilitate subsequent crushing, bagging or other processing. Most of the existing blowing devices include a host casing, a motor, a fan, a switch and a blowing pipe, wherein most of the blowing pipes are round or oval pipes, which are easier to mold. The wall surface is always parallel to its longitudinal axis, so that the airflow is easy to concentrate on the center of the inner wall, resulting in uneven wind speed blown out through the blower pipe, which is easy to form a blowout phenomenon and affects the effect of blowing branches and leaves. In addition, when the air flow flows through the circular tube or the oval tube, it is easy to cause reso...

AI Technical Summary

Problems solved by technology

Most of the existing blowing devices include a host casing, a motor, a fan, a switch and a blowing pipe, wherein most of the blowing pipes are round or oval pipes, which are easier to mold. The wall surface is always parallel to its longitudinal axis, so that the airflow is easy to concentrate on the center of the inner wall, resulting in uneven wind speed blown through the blower pipe, which is easy to form a blowout phenomenon and affects the effect of blowing branches and leaves

In addition, when the air flow flows through the round tube or oval tube, it is easy to cause resonance, causing the user's hand numbness, affecting the comfort of operation, and reducing the utilization rate of the blowing device

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