Cryogenic refrigerator

The cryogenic refrigerator's airtight cover and extended insulation distance for connectors address electrostatic discharge risks, improving safety in flammable atmospheres by preventing ignition.

WO2026116274A1PCT designated stage Publication Date: 2026-06-04SUMITOMO HEAVY IND LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SUMITOMO HEAVY IND LTD
Filing Date
2025-11-21
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Cryogenic refrigerators used in combustible atmospheres face safety risks due to potential electrostatic discharge from electric motors and electrical wiring, which can ignite flammable gases or dust.

Method used

The cryogenic refrigerator design includes an airtight cover surrounding the motor-side and cable-side connectors, a compressor isolated from the ambient atmosphere, and a cold head cable with an airtight coating to prevent contact with flammable substances, along with a longer insulation distance for the motor-side connector to minimize electrostatic discharge risks.

Benefits of technology

The design effectively prevents ignition of flammable substances by isolating the connectors and ensuring a sufficient insulation distance, enhancing safety in combustible environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

This cryogenic refrigerator (10) comprises: a cold head (14) provided with a cold head motor (40), a cold head housing (20) that is disposed in an environmental atmosphere (102) and accommodates the cold head motor (40), and a motor-side connector (20a) that is provided on the outer surface of the cold head housing (20) and is connected to the cold head motor (40); a cold head cable (44) provided with a cable-side connector (44a) that is detachably connected to the motor-side connector (20a), and a power supply cable (44b) that extends from the cable-side connector (44a); and an airtight cover (50) surrounding the motor-side connector (20a) and the cable-side connector (44a) so as to isolate the motor-side connector (20a) and the cable-side connector (44a) from the environmental atmosphere (102).
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