Flywheel energy storage device capable of cooling rotors

Abstract

The invention discloses a flywheel energy storage device capable of cooling rotors. The device comprises a casing, a stator arranged in the middle of the casing and rotors arranged at two sides of the stator, wherein the rotors are fixedly connected by a rotating shaft with a heat pipe structure; the two ends of the rotating shaft are supported on upper and lower cover plates of the casing through a bearing; the outer side of the bearing is fixed in axial direction by a gland; and a closed cavity is defined by the end face of the rotating shaft, the outer side of the bearing and the inner side of the gland. According to the invention, the rotating shaft is made into a heat pipe structure, the middle part (heat-absorbing end) of the rotating shaft rapidly transfers heat to the two ends (heat-releasing ends) of the rotating shaft, and then the heat-releasing ends of the rotating shaft can be cooled so as to effectively conduct heat out of the rotors, thus the effective long-term operation of a system can be ensured.

Description

technical field [0001] The invention relates to a flywheel energy storage system, in particular to a flywheel energy storage device capable of effectively deriving heat from a rotor to ensure effective long-term operation of the system and capable of cooling the rotor. Background technique [0002] The principle of flywheel energy storage generally relies on the motor to drive the flywheel to rotate, and converts electrical energy into mechanical energy for storage. When needed, the deceleration of the flywheel is used to convert the mechanical energy into electrical energy. According to different requirements, there are many design methods for flywheel energy storage system. Flywheel energy storage systems are generally supported by magnetic bearings, especially in high-speed flywheel energy storage systems. In order to reduce air resistance and energy loss, the flywheel is generally placed in a vacuum chamber. A disc-type high-speed flywheel energy storage system with do...

AI Technical Summary

Problems solved by technology

The flywheel rotates at high speed, and it will generate heat when working for a long time. Since the flywheel works in a vacuum environment, the traditional method of cooling the rotor through ventilation is not applicable in a vacuum environment, so it is difficult to export the heat generated by the flywheel.

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