Rotary compressor and refrigeration apparatus

EP4729783A4Pending Publication Date: 2026-07-15DAIKIN INDUSTRIES LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
DAIKIN INDUSTRIES LTD
Filing Date
2024-06-10
Publication Date
2026-07-15

AI Technical Summary

Technical Problem

Centrifugal force and gas load applied to the drive shaft of a rotary compressor result in increased shaft deflection, reducing the rigidity of the shaft.

Method used

The shape of the oil passage in the drive shaft is modified to have a greater length in one direction than in the orthogonal direction, forming a long oil hole or multiple oil holes along the first direction, thereby increasing the rigidity of the drive shaft.

Benefits of technology

This configuration enhances the rigidity of the drive shaft, reducing shaft deflection and noise, while maintaining effective centrifugal pumping action, even under maximum gas load conditions.

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Abstract

A drive shaft (25) has a main shaft portion (26) and an eccentric portion (27). The drive shaft (25) has an oil passage (30). The oil passage (30) includes one or more oil holes (31) extending in an axial direction. As viewed in the axial direction of the drive shaft (25), a predetermined direction in a region surrounded by a phantom envelope (40) that envelops the one or more oil holes (31) is referred to as a first direction (Y), and a direction orthogonal to the first direction (Y) is referred to as a second direction (X). As viewed in the axial direction, the oil passage (30) has a length in the first direction (Y) that is greater than a length in the second direction (X) in the region surrounded by the phantom envelope (40).
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