Scroll Compressor Sub-Discharge Port Involute Shape
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Solution Overview
Problem
In scroll compressors, the existing sub-discharge ports can cause refrigerant leakage due to their circular shape, leading to inefficiency when the compression ratio deviates from the built-in volume ratio, especially resulting in over-compression loss, which reduces compressor efficiency.
Innovation Solution
The design incorporates sub-discharge ports with a pair of side portions extending in the circumferential direction and connecting portions in the radial direction, ensuring the ports do not communicate between adjacent compression chambers during one revolution, thus preventing refrigerant leakage and maintaining necessary opening area and interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the diameter of the circular opening in sub-discharge ports is increased to ensure necessary opening area, then over-compression loss reduction effect is improved, but refrigerant leakage occurs when the opening extends across the scroll tooth thickness or seal
Solution Approach 1:
The patent applies curvature by replacing the circular opening shape with an involute curve shape for the sub-discharge port opening. The involute curve is defined by mathematical equations that ensure the opening follows the scroll tooth profile, allowing the port to accommodate larger dimensions while maintaining proper sealing boundaries and preventing refrigerant leakage between compression chambers.
2Reliability
If sub-discharge ports are arranged to prevent communication between adjacent compression chambers, then refrigerant leakage is reduced, but opening area or opening interval must be compromised
Solution Approach 1:
The patent changes the geometric parameters of the sub-discharge port opening from a simple circular shape to an involute curve shape defined by specific mathematical equations. This parameter transformation allows the opening to achieve optimal area and interval dimensions while maintaining proper alignment with scroll tooth boundaries, thereby preventing refrigerant leakage without compromising opening area.
Data Source
AI summary
A scroll compressor including an orbiting scroll and a fixed scroll. A compression chamber is formed by combining a fixed-scroll volute of the fixed scroll and an orbiting-scroll volute of the orbiting scroll. Each of sub-discharge ports of the fixed scroll brings any one of a first compression chamber and a second compression chamber of a compression chamber, the first compression chamber being defined by an inward-facing surface of the fixed-scroll volute and an outward-facing surface of the orbiting-scroll volute, the second compression chamber being defined by an outwardfacing surface of the fixed-scroll volute and an inward-facing surface of the orbiting scroll volute, and a discharge side into communication with each other.