Electric compressor

The electric compressor addresses cooling inefficiencies by utilizing internal air passages to supply compressed air for cooling, enhancing efficiency and simplifying the structure, thus improving the cooling of the stator and bearings.

WO2026126382A1PCT designated stage Publication Date: 2026-06-18MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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Patent Information

Application Number
PCT/JP2024/043818
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Conventional electric compressors face issues with insufficient cooling air flow rates, complex structures, and increased manufacturing costs due to the need for separate cooling air supply, which affects the efficiency of cooling the stator.

Method used

The electric compressor incorporates a housing with a cylindrical stator, a rotating shaft, and air passages that extract compressed air from the diffuser and scroll sections to cool the thrust bearing, journal bearings, and stator, eliminating the need for external piping and simplifying the structure.

Benefits of technology

This design improves cooling efficiency by using internal air passages to supply compressed air for cooling, reducing complexity and manufacturing costs while ensuring effective cooling of critical components.

✦ Generated by Eureka AI based on patent content.

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    Figure JP2024043818_18062026_PF_FP_ABST
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Abstract

This electric compressor comprises: a housing that has a cylindrical stator in an inner peripheral section thereof; a rotary shaft that is disposed inside of the housing and has a rotor opposing the stator; a compressor wheel that is fixed to one side of the rotary shaft in the axial direction; a pair of journal bearings that are disposed on one side and the other side of the rotary shaft in the axial direction and rotatably support the rotary shaft on the housing; a thrust bearing that is disposed on one side of the rotary shaft in the axial direction and rotatably supports the rotary shaft on the housing; a first air flow passage for extracting a portion of the air compressed by the compressor wheel from a diffuser part and supplying the extracted air to the thrust bearing; and a second air flow passage for extracting a portion of the air compressed by the compressor wheel from a scroll part and supplying the extracted air to the pair of journal bearings.
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