Rotary Compressor Blade Chamber Recess for Lower Oil Stirring Loss

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Solution Overview

Problem

The blade chamber in rotary compressors experiences oil flow disruptions due to varying volumes causing oil to flow through narrow clearances, leading to increased oil stirring loss during blade swings.

Innovation Solution

Incorporating a loss reducer, such as a recess or penetrating portion, in the blade chamber to facilitate smooth oil flow by allowing oil to traverse through the recess or penetrating portion, reducing oil stirring loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the clearance between the inner peripheral wall of the blade chamber and the tip portion of the blade is made narrow to improve sealing, then the oil stirring loss increases due to oil flowing through the narrow clearance during blade swing

Engineering Contradiction:

Improvesealing performanceVSAvoidoil stirring loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The blade chamber is divided into a first space and a second space by the blade, creating separate flow paths. The oil supply passage is positioned to supply oil to one space while the other space drains to the oil reservoir, segmenting the oil flow path to avoid stirring loss in the clearance region

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an oil supply passage as an intermediary structure that mediates oil delivery to the blade chamber. By controlling oil supply location and timing, it enables smooth oil flow without forcing oil through the narrow clearance between the blade tip and chamber wall, thus reducing stirring loss while maintaining lubrication

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The configuration ensures smooth eccentric rotation of the piston by minimizing oil stirring loss, even at high speeds, thereby enhancing compressor performance.

Implementation Method 1

a piston (45) housed in the cylinder chamber (41); and a blade (47) extending radially outward from the piston (45), the piston (45) eccentrically rotating in the cylinder chamber (41) while the blade (47) swings

Methodology Applied

Scientific EffectEccentric rotation: Eccentric

Implementation Method 2

an oil supply passage (37) that supplies oil to the blade chamber (43); and a loss reducer (70) that reduces an oil stirring loss in the blade chamber (43) due to swing of the blade (47)

Methodology Applied

Scientific EffectLubrication: Lubrication

Data Source

PatentEP4459128B1Rotary compressor and refrigeration apparatus

Publication Date: 2026.03.25 DAIKIN INDUSTRIES LTD

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AI summary

A cylinder (40) includes a blade chamber (43) that houses a tip portion of the blade (47). An oil supply passage (37) supplies oil to the blade chamber (43). A loss reducer (70) reduces an oil stirring loss in the blade chamber (43) due to the swing of the blade (47).