A self-pumping vacuum shaftless double flywheel energy storage device using a compound molecular pump

Abstract

The invention discloses a self-pumping shaftless double-flywheel energy storage device using a compound molecular pump. The upper and lower spherical flywheel rotors are symmetrically distributed at both ends of the motor stator, and a groove is opened on the side close to the motor stator, and a motor is embedded in the groove. Rotor, the flywheel rotor is provided with a five-degree-of-freedom magnetic bearing radially outside, which includes an axial stator, a radial stator, a torsion stator, and a permanent magnet. Gyroscopic effect; there is a composite molecular pump under the flywheel, the upper part is a turbo molecular pump, the lower part is a traction molecular pump, and the middle is a transition structure. The pumping speed of the low-pressure side, the radius of the moving blade and the static blade decreases from top to bottom; the spiral groove of the traction molecular pump is opened on the stator, and the rotor is smooth; the radius of the moving blade on the upper part of the pump body is relatively large, and the centrifugal force is small, which improves the vacuum pump performance. operational reliability.

Description

technical field [0001] The invention relates to the field of flywheel batteries, in particular to a shaftless double flywheel energy storage device with a self-pumping function that adopts a five-degree-of-freedom magnetic bearing as the magnetic bearing suspension. Background technique [0002] Flywheel battery is also known as flywheel energy storage system. It utilizes the characteristics of small size, light weight and high energy density of flywheel, which can store a large amount of kinetic energy and convert it into electrical energy by motor. It is an energy storage technology with broad application prospects. As a new type of energy storage device, it has been paid more and more attention by many countries in the world, and has become a research hotspot at present. Due to the large energy storage requirements of the flywheel battery, the traditional maglev flywheel battery adopts a single flywheel structure, resulting in a larger radius of the flywheel to increase i...

AI Technical Summary

Problems solved by technology

The prior art involves a composite molecular pump combining a first-stage turbomolecular pump and a traction molecular pump. The gap blades of the turbomolecular pump are eliminated and the continuous blades of the pump rotor are made. The purpose is to reduce the blade slip caused by the large centrifugal force. A fault occurs, but the number of turbomolecular pump stages is too small to meet the pumping speed requirements of the ideal vacuum side of the device

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