Rotary compressor and refrigeration cycle device

By incorporating an inclined surface on the roller's lower end to create a wedge effect, the rotary compressor achieves reduced leakage and improved efficiency through uniform gap formation.

EP4764218A1Pending Publication Date: 2026-06-24DAIKIN INDUSTRIES LTD
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Patent Information

Application Number
EP2025852800
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-09-30
Filing Date
2025-09-08
Publication Date
2026-06-24

AI Technical Summary

Technical Problem

In conventional rotary compressors, the high-pressure lubricant does not effectively generate a vertically upward force on the roller, leading to non-uniform gaps between the roller end surfaces and end plates, resulting in insufficient reduction of leakage loss.

Method used

The lower end surface of the roller is designed with an inclined surface that forms a wedge-shaped gap with the end plate, allowing high-pressure lubricant to push the roller upward, creating a uniform gap and reducing leakage.

Benefits of technology

The roller floats up to an appropriate height, ensuring uniform gaps and reducing both lubricant and refrigerant leakage, thereby enhancing operational efficiency.

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Abstract

A lower end surface of a roller (36) of a rotary compressor (1) has a horizontal surface (36a) parallel to an upper surface of a rear head (42), and an inclined surface (36b) continuous with an outer peripheral side of the horizontal surface (36a); extending to an outer peripheral surface (36o) of the roller (36); and inclined so as to be positioned higher at a radially outer side.
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Citation Information

Patent Citations

  • Rotary compressor

    JP2010031733A