Elastic Metal Adjusting Member for Scroll Compressor Orbiting Motion

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Solution Overview

Problem

Existing scroll fluid machines, such as scroll vacuum pumps and compressors, face issues with self-rotation-preventing devices made of elastic materials like fluororubber deteriorating under chemically-attacking gases, leading to errors in orbiting motion and loose engagement of scrolls, which disrupt smooth operation.

Innovation Solution

The implementation of a self-rotation-preventing device using a wear-resistant elastic metal adjusting member with a crank pin, sliding bearing, and metal balls to correct errors in orbiting motion between scrolls, ensuring stable engagement and operation under severe conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If elastic materials such as fluororubber are used for the self-rotation-preventing device, then the device can adjust errors in orbiting motion, but the material deteriorates under chemically-attacking gases, leading to loose engagement and disruption of smooth operation

Engineering Contradiction:

Improvestability of self-rotation-preventing deviceVSAvoidservice life of O-ring

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The invention changes the material parameter from organic elastic material (fluororubber) to inorganic elastic material (elastic metal), which fundamentally alters the chemical resistance properties while maintaining the elastic adjustment function for orbiting motion errors

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention uses a composite structure combining elastic metal with metal balls and a crank pin mechanism, creating a composite self-rotation-preventing device that maintains engagement stability under chemically-attacking conditions

Inventive Principle:

Principle #40Composite materials

2Ease of operation

If elastic materials are used for the self-rotation-preventing device, then the device provides initial engagement, but the material deteriorates causing loss of engagement and inability to maintain smooth motion

Engineering Contradiction:

Improvesmooth motion between scrollsVSAvoidengagement stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention changes the material from fluororubber to elastic metal, transforming the chemical resistance parameter from poor to excellent, thereby maintaining engagement stability and smooth motion under chemically-attacking gases

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces metal balls as intermediary elements between the elastic metal adjusting member and the orbiting scroll, providing a durable contact interface that maintains smooth motion without deteriorating in chemically-attacking environments

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS7314358B2Scroll fluid machine having an adjustment member for correcting an error in orbiting motion between fixed and orbiting scrolls

Publication Date: 2008.01.01 ANEST IWATA CORP

AI summary

A scroll fluid machine comprises a fixed scroll, an orbiting scroll and a self-rotation-preventing device for preventing the orbiting scroll from rotating on its own axis. The self-rotation-preventing device comprises a bearing in a support hole of the orbiting scroll, a crank pin which connects the orbiting scroll to the orbiting scroll, and an adjusting member interposed between the inner circumferential surface of the support hole and the outer circumferential surface of the bearing to correct an error in orbiting motion between the two scrolls.