Scroll Compressor Thin Section Orbiting Volute Wall

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Solution Overview

Problem

Scroll compressors face limitations in size due to installation site constraints and struggle to maximize fluid compression efficiency within these size limitations.

Innovation Solution

The scroll compressor design incorporates an orbiting volute wall with a non-linear section that includes a thin region with a thickness less than adjacent sections, allowing for an increased winding number without increasing the size of the orbiting base plate, enhancing fluid trapping and compression efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the size of the scroll compressor is increased to improve compression efficiency, then the amount of fluid trapped in compression chambers increases, but the compressor size exceeds installation site limitations

Engineering Contradiction:

Improveamount of fluid trappedVSAvoidcompressor size

Core Design Contradiction:

Quantity of substanceVSVolume of moving object

Solution Approach 1:

The orbiting volute wall is designed with non-uniform thickness, featuring a thin section with reduced thickness in a specific involute angle range. This local variation allows increased fluid trapping capacity in critical regions without proportionally increasing the overall compressor volume, thereby resolving the contradiction between fluid quantity and compressor size.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the geometric parameter of the orbiting volute wall by introducing a thin section with specific thickness reduction. This parameter modification enables more compression chambers to be formed within the same orbital path, increasing fluid trapping capacity while maintaining the same base plate size and thus the same overall compressor footprint.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the orbiting volute wall thickness is reduced to increase winding number, then compression efficiency improves, but structural stiffness may be compromised

Engineering Contradiction:

Improvecompression efficiencyVSAvoidstructural stiffness

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The orbiting volute wall features a thin section with reduced thickness only in the specific involute angle range, while other sections maintain adequate thickness for structural support. This localized thinning increases the winding number and compression efficiency without compromising the overall structural stiffness of the volute wall.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of uniformly reducing the wall thickness throughout, the invention applies thickness reduction only partially in specific regions where it benefits compression efficiency. This partial action achieves the desired productivity improvement while minimizing the impact on structural strength.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS11821422B2Scroll compressor with a thin section in the orbiting volute wall

Publication Date: 2023.11.21 TOYOTA INDUSTRIES CORP

AI summary

A scroll compressor includes a fixed scroll and an orbiting scroll. The orbiting scroll includes an orbiting volute wall. The orbiting volute wall is shaped to form an involute and to have a thickness. The orbiting volute wall includes a thin section in which the thickness is less than those in adjacent sections. The thin section includes a region corresponding to an involute angle that is obtained by subtracting 360° from a maximum of the involute angle.