Scroll Compressor Bypass Holes Prevent Over-Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional constant speed type scroll compressors experience over-compression loss under high load conditions and inefficiency under low load conditions, while inverter type scroll compressors designed with the same wrap volume ratio as constant speed types suffer from over-compression and efficiency degradation at low loads.
Innovation Solution
A variable radius type scroll compressor with a bypass hole system is designed to optimize the wrap volume ratio, allowing for reduced over-compression by positioning bypass holes between 1.8 and 2.2, where the bypass section overlaps with the discharge section at a crank angle range of 20° to 150°, enhancing efficiency under low load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a constant speed type scroll compressor is designed with a fixed wrap volume ratio, then it performs adequately under high load conditions, but it experiences over-compression loss and inefficiency under low load conditions
Solution Approach 1:
The patent introduces a variable radius scroll mechanism where the orbiting scroll's radius varies during operation, allowing the wrap volume ratio to change dynamically. This enables the compressor to adapt to different load conditions by adjusting the compression chamber volume, thereby reducing over-compression loss at low loads while maintaining effectiveness at high loads
Solution Approach 2:
The patent changes the geometric parameter of the scroll compressor by introducing bypass holes at specific positions and angles. These bypass holes allow controlled refrigerant leakage that adjusts the effective compression volume, enabling the system to optimize performance across varying load conditions by changing the operational parameters of the compression chambers
2Speed
If an inverter type scroll compressor is designed with the same wrap volume ratio as constant speed types, then it can operate at variable speeds, but it still suffers from over-compression and efficiency degradation at low loads
Solution Approach 1:
The patent combines variable speed operation with a variable radius scroll design. The orbiting scroll's radius varies during operation, allowing the wrap volume ratio to change dynamically. This enables the compressor to adapt to different load conditions by adjusting the compression chamber volume, thereby reducing over-compression loss at low loads while maintaining effectiveness at high loads
Solution Approach 2:
The patent introduces bypass holes positioned at specific crank angles (20° to 150°) to control refrigerant flow and adjust the effective compression volume. This parameter change allows the system to optimize performance across varying load conditions by controlling when and how refrigerant bypasses certain compression chambers, preventing over-compression at low loads
Data Source
AI summary
A scroll compressor is provided, in which at least one bypass hole that bypass a portion of a refrigerant before the refrigerant is discharged through a discharge hole is formed at a position where a bypass section that bypasses the refrigerant through the at least one bypass hole overlaps a discharge section that discharges the refrigerant through the discharge hole. The at least one bypass hole is formed at a position where a wrap volume ratio (Vs/Vd), which is a ratio of a suction volume (Vs) with respect to a discharge volume (Vd) in a compression chamber, is within the range of about 1.8˜2.2. With this configuration, over-compression of refrigerant may be prevented in a low speed driving mode, and efficiency of the compressor may be enhanced in the low speed driving mode and under a low load condition.