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Introduction to Fan Structure Design Principle | 20 inch electric box fan
The composition and principle of the fan
A magnetic rubber magnetic ring is placed inside the fan blade to form an external magnetic field of permanent magnet. When the two sets of coils on the silicon steel sheet are energized, the silicon steel sheet generates a magnetic field, and the Hall induction element is used to synchronously detect the control circuit, so that the two sets of coils are wound on the silicon steel sheet. The coils work in turn. The silicon steel sheet produces different magnetic poles, and the magnetic poles and the rubber magnetic ring produce attraction and repulsion. When the attraction and repulsion is greater than the static friction force of the fan, the fan blades rotate naturally. Thanks to the synchronizing signal provided by the Hall sensor element, the fan blades can continue to operate. | 20 inch electric box fan
Fan Structure - Fan Flow Field
1. The generation of fan airflow
The rotation of the fan blades pushes down the air particles in the volume where the blades are located, causing the air pressure at the air inlet in this area to continue to drop, and the air pressure at the air outlet to continue to rise, resulting in an increase in the axial air pressure in the entire fan blade area; The air pressure outside the tuyere is greater than the air pressure at the air inlet, causing the supplement of external air, and the supplementary air is also transported to the high-pressure area by the blades, resulting in a further drop in the air pressure at the air inlet, attracting more air to supplement the low-pressure area, and so on until The supplementary amount of air is equal to the conveying amount of the fan industry, which is equal to the amount of air gushing out of the air outlet to achieve dynamic balance.
2. Fan is a kind of power equipment that converts mechanical energy into potential energy and kinetic energy of gas. According to the direction of airflow, it can be divided into the following three categories:
Axial flow: The airflow direction is parallel to the axis, the fluid enters the fan blade along the central axis of the fan blade, and flows out along the central axis of the fan blade.
Radial flow (centrifugal): the airflow is perpendicular to the axis along the radial direction of the impeller, and the fluid enters the fan blade axially along the center of the fan blade and flows out radially along the fan blade.
Mixed flow (oblique flow): The airflow direction has both an axial component and a radial component. The fluid enters the fan blade along the central axis of the fan blade and flows out along the axial direction of the fan blade and the radial direction of the fan blade.
A magnetic rubber magnetic ring is placed inside the fan blade to form an external magnetic field of permanent magnet. When the two sets of coils on the silicon steel sheet are energized, the silicon steel sheet generates a magnetic field, and the Hall induction element is used to synchronously detect the control circuit, so that the two sets of coils are wound on the silicon steel sheet. The coils work in turn. The silicon steel sheet produces different magnetic poles, and the magnetic poles and the rubber magnetic ring produce attraction and repulsion. When the attraction and repulsion is greater than the static friction force of the fan, the fan blades rotate naturally. Thanks to the synchronizing signal provided by the Hall sensor element, the fan blades can continue to operate. | 20 inch electric box fan
Fan Structure - Fan Flow Field
1. The generation of fan airflow
The rotation of the fan blades pushes down the air particles in the volume where the blades are located, causing the air pressure at the air inlet in this area to continue to drop, and the air pressure at the air outlet to continue to rise, resulting in an increase in the axial air pressure in the entire fan blade area; The air pressure outside the tuyere is greater than the air pressure at the air inlet, causing the supplement of external air, and the supplementary air is also transported to the high-pressure area by the blades, resulting in a further drop in the air pressure at the air inlet, attracting more air to supplement the low-pressure area, and so on until The supplementary amount of air is equal to the conveying amount of the fan industry, which is equal to the amount of air gushing out of the air outlet to achieve dynamic balance.
2. Fan is a kind of power equipment that converts mechanical energy into potential energy and kinetic energy of gas. According to the direction of airflow, it can be divided into the following three categories:
Axial flow: The airflow direction is parallel to the axis, the fluid enters the fan blade along the central axis of the fan blade, and flows out along the central axis of the fan blade.
Radial flow (centrifugal): the airflow is perpendicular to the axis along the radial direction of the impeller, and the fluid enters the fan blade axially along the center of the fan blade and flows out radially along the fan blade.
Mixed flow (oblique flow): The airflow direction has both an axial component and a radial component. The fluid enters the fan blade along the central axis of the fan blade and flows out along the axial direction of the fan blade and the radial direction of the fan blade.