Scroll Compressor Machining for Dimensional Deviation Compensation

Solution Overview

Problem

The existing scroll fluid machines suffer from fluid leakage due to dimensional errors between the fixed and orbiting scrolls and the housing, limiting efficiency improvements despite efforts to enhance machining accuracy.

Innovation Solution

A manufacturing method that involves upstream and downstream machining steps to set and cancel out dimensional deviations in the orbiting scroll, housing, and fixed scroll, ensuring their deviations align to minimize gaps and leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If machining accuracy of the fixed scroll, orbiting scroll, and housing is improved to reduce fluid leakage, then efficiency of the scroll fluid machine is improved, but manufacturing time and cost increase due to stricter machining requirements

Engineering Contradiction:

Improveefficiency of scroll fluid machineVSAvoidmanufacturing time

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies preliminary action by measuring the dimensional deviations of the orbiting scroll and housing before assembling the fixed scroll, and using these measurements to determine the target values for fixed scroll machining. This allows the fixed scroll to be machined with compensating deviations that will cancel out the deviations of other components when assembled, reducing fluid leakage without requiring higher machining accuracy across all components.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If machining accuracy of the fixed scroll, orbiting scroll, and housing is improved to reduce fluid leakage, then efficiency of the scroll fluid machine is improved, but manufacturing cost increases due to stricter machining requirements

Engineering Contradiction:

Improveefficiency of scroll fluid machineVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies preliminary action by measuring the dimensional deviations of the orbiting scroll and housing before assembling the fixed scroll, and using these measurements to determine the target values for fixed scroll machining. This allows the fixed scroll to be machined with compensating deviations that will cancel out the deviations of other components when assembled, reducing fluid leakage without requiring higher machining accuracy across all components.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If dimensional deviation of individual components is reduced to minimize gaps, then fluid leakage is reduced, but the variance of total deviation cannot be sufficiently reduced due to limitations in machining accuracy

Engineering Contradiction:

Improvedimensional deviation of componentsVSAvoidfluid leakage reduction

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies feedback by measuring the actual dimensional deviations of the orbiting scroll and housing, using these measurement results to set the target values for fixed scroll machining, and then machining the fixed scroll to achieve these targets. This closed-loop approach ensures that the fixed scroll's deviations are specifically tailored to cancel out the deviations of other components, achieving better overall assembly precision and reduced fluid leakage.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies parameter changes by intentionally setting non-zero target values for the dimensional deviations of the fixed scroll based on the measured deviations of other components. Instead of aiming for zero deviation in all components, the patent changes the approach to allow controlled deviations that will cancel out when components are assembled, achieving better overall precision.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3748164B1Methods for manufacturing a scroll fluid machine

Publication Date: 2025.10.15 DAIKIN INDUSTRIES LTD

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AI summary

In a scroll compressor (10) which is a scroll fluid machine, an orbiting scroll machining step and a housing machining step are performed as upstream machining steps. In a measurement step, dimensional deviations of an orbiting scroll (50) and a housing (60) machined in the upstream machining steps are measured. In a target setting step, a target value of a dimensional deviation of a fixed scroll (40) is set so that the dimensional deviations of the orbiting scroll (50) and the housing (60) are canceled out. In a fixed scroll machining step which is a downstream machining step, the fixed scroll (40) is machined so that the dimensional deviation of the fixed scroll (40) becomes the target value.