Electrohydraulic machinery

The electro-fluid machine addresses cooling and water intrusion issues by using a first compression unit to cool air before introduction into the housing, bypassing the intercooler and maintaining pressure balance, thus improving fuel cell system efficiency and reliability.

JP7708003B2Active Publication Date: 2025-07-15TOYOTA INDUSTRIES CORP
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Patent Information

Application Number
JP2022084618
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-05-24
Publication Date
2025-07-15
Estimated Expiration
2042-05-24

AI Technical Summary

Technical Problem

Existing electro-fluid machines in fuel cell systems face issues with cooling the radial and thrust bearings, as well as the motor, leading to increased system size due to the need for an intercooler, and risk of water intrusion from the regeneration chamber into the motor chamber.

Method used

The electro-fluid machine incorporates a first compression unit to compress air, which is cooled before being introduced into the housing, bypassing the need for an intercooler, and uses an introduction flow path to cool bearings and motor components, while maintaining pressure balance to prevent water intrusion.

Benefits of technology

This design effectively cools bearings and motor components without increasing system size and prevents water intrusion, enhancing the efficiency and reliability of the fuel cell system.

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Abstract

To suppress incurring of increase in size of whole fuel cell system, and furthermore to suppress ingress of water existing in a regeneration chamber into a motor chamber.SOLUTION: Air compressed by a first compression unit 51 is introduced into between a first impeller chamber 24 and a regeneration chamber 36 in a housing 11 via an introduction flow passage 60. Therefore as an example, air with lower temperature is introduced into the housing 11 than a case in which a part of the air compressed by a second compression unit 52 is introduced into the housing 11. Thus, it is not necessary that a part of the air supplied to a fuel cell stack 62 is cooled by using an inter cooler before the air is introduced into the housing 11 as conventional one. The air compressed by the first compression unit 51 is introduced into the motor chamber 18 via the introduction passage 60 to thereby rise pressure in the motor chamber 18. Therefore, it is suppressed that the pressure in the motor chamber 18 becomes lower than the pressure in the regeneration chamber 36.SELECTED DRAWING: Figure 1
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Citation Information

Patent Citations

  • Turbo-compressor

    JP1993223090A

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    JP2016102482A

  • Turbo compressors, especially for fuel cell systems

    JP2021502684A

  • Centrifugal compressor for fuel battery

    JP2022007026A

  • Multi-stage compressor with turbine section for fuel cell system

    US20190145416A1