Scroll Compressor Rotation Prevention via Phase-Shifted Shoulder and Step Portions
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Solution Overview
Problem
The existing scroll compressor technologies face challenges in preventing the rotation of the orbiting scroll while maintaining cost-effectiveness, as the pin-ring type rotation-preventing mechanism requires high machining accuracy, increasing manufacturing costs, and either increasing the number of pin-ring pairs or reducing them leads to compromised performance.
Innovation Solution
The design incorporates a scroll compressor with a housing, fixed scroll, and orbiting scroll featuring wall-body shoulder portions and end-plate step portions that engage to prevent rotation, allowing the orbiting scroll to revolve while minimizing the number of rotation-preventing components, thereby reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pin-ring type rotation-preventing mechanism is used, then the rotation of the orbiting scroll is prevented, but the manufacturing cost is increased due to high machining accuracy requirements
Solution Approach 1:
The rotation-preventing function is divided into multiple independent pin-ring pairs distributed around the orbiting scroll. Each pin-ring pair independently prevents rotation at different phases, allowing the system to maintain reliable rotation prevention while using simpler, more manufacturable individual components with lower machining accuracy requirements.
Solution Approach 2:
The pin-ring mechanism is implemented with varying local characteristics - multiple pins and rings are positioned at different phases around the orbiting scroll, with each pair optimized for its specific location. This allows the system to achieve comprehensive rotation prevention while maintaining cost-effectiveness through localized rather than uniform high-precision manufacturing.
2Strength
If the number of pin-ring pairs is increased, then the load per pin is decreased, but the manufacturing cost is increased
Solution Approach 1:
Instead of using a single pin-ring pair that would bear the full load, the invention employs multiple pin-ring pairs that share the rotational load. While more than the minimum one pair is used, the number is optimized to provide sufficient load distribution without excessive multiplication, achieving a balance where each pin experiences acceptable load levels while manufacturing costs remain controlled.
3Ease of manufacture
If the number of pin-ring pairs is decreased, then the manufacturing cost is reduced, but the load per pin is increased
Solution Approach 1:
The invention uses a optimized number of pin-ring pairs that is more than the absolute minimum but less than a full circumferential distribution. This partial multiplication of components achieves sufficient load distribution to keep per-pin loads at acceptable levels while avoiding the excessive manufacturing cost that would result from using many more pairs.
Data Source
AI summary
A scroll compressor prevents the rotation of an orbiting scroll and reduces manufacturing cost. This scroll compressor has a housing, a fixed scroll having a first end plate and a first spiral wall body, an orbiting scroll having a second end plate and a second spiral wall body, rotation-preventing portions provided for at least one of the housing and the orbiting scroll, which allow the orbiting scroll to revolve while preventing the rotation thereof, a wall body shoulder portion formed along an upper edge of the second spiral wall body, and a step portion formed on the first end plate. In this scroll compressor, the shoulder portion and the step portion contact with and slide along each other, and a phase at which the shoulder portion is disposed to the center of the orbiting scroll is different from phases at which the rotation-preventing portions are disposed.