Scroll Compressor Dual-Coating Structure to Prevent Scroll Adhesion
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Solution Overview
Problem
The scroll compressor in existing technologies faces durability issues due to direct contact between nickel-phosphorus plating on the orbiting scroll and the aluminum-based material of the fixed scroll, leading to adhesion and excessive frictional heat, which is not effectively addressed by existing coatings.
Innovation Solution
Implement a dual-coating system where the fixed scroll is coated with tin plating on the compression chamber-side end face and surface of the spiral wall, while the orbiting scroll is coated with nickel-phosphorus plating, with the orbiting scroll's spiral wall height set higher than the fixed scroll's, ensuring the coatings do not directly contact the aluminum-based material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nickel-phosphorus plating is applied only to the orbiting scroll, then weight is reduced and manufacturing is simplified, but adhesion occurs between the nickel coating and aluminum baseplate due to direct contact
Solution Approach 1:
A tin coating layer is introduced as an intermediary between the nickel-phosphorus plating on the orbiting scroll and the aluminum-based baseplate of the fixed scroll. This tin layer prevents direct contact between nickel and aluminum, eliminating adhesion caused by mutual solubility while maintaining the weight reduction benefits of selective plating.
Solution Approach 2:
The invention creates a composite coating structure where tin and nickel-phosphorus plating are combined on different scrolls. The tin-coated fixed scroll and nickel-phosphorus coated orbiting scroll form a composite system that leverages the non-adhesive properties of tin with aluminum while maintaining the beneficial properties of nickel-phosphorus plating.
2Reliability
If the spiral wall height is increased to ensure coating separation, then adhesion is prevented, but manufacturing precision requirements increase
Solution Approach 1:
The invention introduces asymmetric design by making the spiral wall height of the orbiting scroll greater than that of the fixed scroll. This asymmetric height difference ensures that the tin coating on the fixed scroll and the nickel-phosphorus coating on the orbiting scroll remain separated during operation, preventing adhesion while providing a clear geometric criterion for manufacturing.
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
This configuration improves durability and reduces weight by preventing adhesion and excessive frictional heat, while maintaining airtightness and reducing manufacturing costs through strategic coating application.
Implementation Method 1
a first coating layer formed by tin plating is formed on a compression chamber-side end face of the baseplate of one scroll of the fixed scroll and the orbiting scroll and a surface of the spiral wall of the one scroll, and a second coating layer formed by nickel-phosphorus plating is formed on a compression chamber-side end face of the baseplate of another scroll of the fixed scroll and the orbiting scroll and a surface of the spiral wall of the other scroll
Data Source
AI summary
A first coating layer formed by tin plating is formed on a compression chamber-side end face of a baseplate of one scroll and a surface of a spiral wall, a second coating layer formed by nickel-phosphorus plating is formed on a compression chamber-side end face of a baseplate of another scroll and a surface of a spiral wall, a wall height of the spiral wall of the other scroll is higher than a wall height of the spiral wall of the one scroll, and the first coating layer at the tip of the spiral wall of the one scroll and the second coating layer of the baseplate of the other scroll are separated from each other, and the first coating layer of the baseplate of the one scroll and the second coating layer at the tip of the spiral wall of the other scroll are in contact with each other.