Scroll Compressor Discharge Cover Volume Optimization
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Solution Overview
Problem
In lower compression type scroll compressors, pressure pulsation during refrigerant discharge interferes with smooth flow, leading to reduced compressor efficiency, and finding an appropriate discharge cover size that matches compressor capacity is challenging.
Innovation Solution
The design includes a discharge cover with a discharge space volume optimized based on the volume ratio of the discharge space to the initial compression chamber, with a volume ratio of 4.5 or more, and features such as discharge guide grooves and space expansion grooves to reduce pressure pulsation and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a discharge cover is provided in lower compression type scroll compressor to guide refrigerant upward, then refrigerant flow guidance is improved, but pressure pulsation occurs that interferes with smooth flow and lowers compressor efficiency
Solution Approach 1:
The patent applies parameter changes by optimizing the discharge cover volume ratio (Vd/Vc) to be within 0.5-2.0 times the compression chamber volume. This quantitative parameter optimization reduces pressure pulsation while maintaining effective refrigerant flow guidance, thereby resolving the contradiction between flow guidance and compressor efficiency.
Solution Approach 2:
The discharge cover acts as an intermediary component between the compression chamber and discharge passage. By introducing this intermediate structure with optimized volume, the patent mediates the pressure pulsation issue while still providing necessary flow guidance functionality.
2Productivity
If discharge cover size is increased to reduce pressure pulsation, then compressor efficiency improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent establishes specific parameter ranges (volume ratio Vd/Vc between 0.5-2.0 times compression chamber volume) that balance efficiency improvement with manufacturing feasibility. This quantified approach avoids excessive complexity by providing clear design boundaries rather than requiring custom optimization for each application.
Solution Approach 2:
The discharge cover design with optimized volume serves multiple functions simultaneously: it guides refrigerant flow, reduces pressure pulsation, and maintains compact dimensions. This multi-functionality reduces overall device complexity by consolidating multiple requirements into a single optimized component.
3Productivity
If discharge cover volume is optimized to match compressor capacity, then pressure pulsation is reduced and efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent provides practical parameter ranges (Vd/Vc ratio of 0.5-2.0 times compression chamber volume) that achieve efficiency improvement without requiring ultra-precise manufacturing. These rounded, practical values are easier to manufacture while still delivering the desired performance benefits.
Solution Approach 2:
The patent accepts partial optimization of the discharge cover volume (within the 0.5-2.0 times range) rather than requiring exact theoretical optimization. This partial action approach reduces manufacturing precision requirements while still achieving significant efficiency improvements.
Data Source
AI summary
A scroll compressor may include a first scroll and a second scroll orbiting relative to the first scroll to form compression chambers, a discharge port provided in the first scroll to discharge refrigerant compressed in the compression chamber, a discharge passage formed through the first discharged through the discharge to an upper side of the frame, and a discharge cover coupled to the first scroll and having a space to accommodate end portions of the discharge port and the discharge passage to guide the refrigerant discharged through the discharge port to the discharge passage. A volume of a discharge space defined in the space by the first scroll may be 4.5 or more, obtained by dividing a volume of the discharge space by a total volume of an initial compression chamber among the compression chambers.