Impeller combination structure of magnetic suspension axial flow fan

Abstract

The invention discloses an impeller combination structure of a magnetic suspension axial flow fan. The impeller combination structure comprises a shell, a rotor drum, a rotor, a movable impeller and a static impeller, wherein the rotor drum is fixed in the shell; the rotor is arranged in the rotor drum; the movable impeller is fixed to the rotor; the static impeller is fixed to the shell; a protection ring is arranged on the static impeller and used for protecting the movable impeller; and sealing pieces are arranged on the static impeller and the rotor drum and used for reducing airflow leakage. The protection ring is arranged on the static impeller, the movable impeller is arranged in the protection ring in a matched mode, and the protection ring can elastically deform to avoid movable impeller blades when the movable impeller rotates at a high speed and deforms, so that abrasion of the movable impeller blades is reduced. The sealing pieces are arranged on the static impeller and the rotor drum, and gas leaking from gaps between the driven impeller and members on the two sides can be blocked by the sealing pieces, so that gas leakage is reduced, the pressure and flow of the fan are increased, the sealing pieces dissipate gas vibration energy, and the operation noise of the fan is reduced.

Description

technical field [0001] The invention relates to an impeller combination structure of a fan, in particular to an impeller combination structure of a magnetic levitation axial flow fan. Background technique [0002] A fan is a machine that converts mechanical energy into kinetic energy of a gas medium. Through the rotation of blades of a specific shape, the directional movement of the gas is driven to generate kinetic energy. Fans are widely used in various occasions for cooling, moisture-proof, etc. An axial flow fan refers to a fan whose gas movement direction is parallel to the rotor axis. Compared with a centrifugal fan, an axial flow fan outputs a larger gas flow rate and a lower gas pressure. In order to meet the aerodynamic requirements of the fan, in addition to the rotating impeller, some axial fans are also equipped with a static impeller. The static impeller cooperates with the moving impeller to improve the gas flow field in the fan and meet the design requirements...

AI Technical Summary

Problems solved by technology

When the rotating speed of the moving impeller is high, the blades of the moving impeller will be deformed during rotation, which will rub against the inner wall of the casing. After a period of time, the length of the blade will become shorter, which cannot meet the aerodynamic requirements, especially for materials with a small elastic modulus. This situation is especially obvious for the manufactured impeller, so there must be a protective structure to adapt to the change of the impeller; on the other hand, when the aerodynamic requirements of the fan increase, such as flow, pressure, and operating noise requirements, the impeller and The gap between the components on both sides will cause many problems. Due to the high-speed rotation of the moving impeller relative to the components on both sides, there must be a gap between the moving impeller and the components on both sides. Considering the processing and assembly accuracy, the value of the gap has the minimum extreme value. Therefore, it must be There is an auxiliary structure to weaken the adverse effect of the gap

These two requirements cannot be met by the existing impeller combination structure

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