Electric Supercharger and Its Cooling Structure

Abstract

The invention discloses a cooling structure of an electric supercharger. A wall portion of an inverter housing is provided with a first input through hole and a first output through hole which pass through an axial end surface of the inverter housing, and liquid cooling medium flows through the first input through hole and the first output through hole. Multiple second input through holes and second output through holes extending into an inner cavity of the bearing housing are arranged at intervals on an outer peripheral surface of the bearing housing. A heat conduction end cover is fixed to an end part of the inverter housing, the heat conduction end cover is provided with a third input hole and a third output hole axially, and the third input hole is corresponding to the other end of thefirst input through hole. A middle part of the heat conduction end cover is provided with a front bearing seat which is partially located in an annular inner cavity, and the circumferential surface of the front bearing seat is provided with multiple liquid guide holes extending into an inner cavity of the front bearing seat. The cooling structure has a good cooling effect.

Description

technical field [0001] The invention relates to an electric supercharger and its cooling structure. Background technique [0002] Document 1 (CN109072777A) discloses an electric supercharger comprising: a compressor, an electric motor and an inverter. The compressor, electric motor and inverter are housed in the casing. The casing includes a compressor casing, a motor casing, and an inverter casing. The electric supercharger rotates and drives a compressor by an electric motor controlled by an inverter to generate compressed air. This compressed air is supplied to the aforementioned internal combustion engine. The electric supercharger relies on cooling fins arranged on the motor casing to dissipate heat. [0003] Document 2 (CN105940201A) discloses a supercharger. The structure of the supercharger is: at the end of the rotor shaft connected to the compressor part, a motor is installed, and the motor has an opening for introducing cooling air into the inside. The superc...

AI Technical Summary

Problems solved by technology

For the electric supercharger, the electric motor is a high-speed component, and the electric motor rotates at a speed of 70,000 to 80,000 revolutions per minute. Such a high speed will generate a lot of heat. Neither the cooling method nor cooling by means of cooling air can greatly reduce the heat of the electric motor, which will cause the bearings supporting the electric motor to be easily worn, resulting in a short service life of the bearings

Moreover, the above-mentioned cooling structure cannot cool the inverter, and the inverter will also generate a lot of heat during the working process. The inverter is encapsulated in the inverter shell and cannot be cooled for a long time, resulting in The electronic components of the electronic components are rapidly aging, resulting in a shortened service life of the inverter

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