Scroll Compressor Injection Passage Design
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Solution Overview
Problem
In scroll compressors, the expansion of refrigerant in the compression chamber increases pressure, hindering the motion of the orbiting scroll and reducing compressor efficiency.
Innovation Solution
The refrigerant is injected into the suction chamber instead of the compression chamber through a specially designed injection passage, reducing pressure increases in the compression chamber and improving compressor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant is supplied to the refrigerant compression chamber through the injection port, then the refrigerant temperature is reduced, but the pressure increase in the compression chamber hinders the motion of the orbiting scroll
Solution Approach 1:
The invention divides the refrigerant supply path into two separate channels: one supplying refrigerant to the suction chamber and another supplying refrigerant to the compression chamber. This segmentation allows independent control of refrigerant flow to each chamber, preventing pressure buildup in the compression chamber while maintaining cooling effect.
Solution Approach 2:
The invention extracts the refrigerant supply function from the compression chamber by introducing a separate injection port in the suction chamber. This extraction removes the harmful effect of pressure increase in the compression chamber while preserving the beneficial cooling effect through the suction chamber injection.
2Temperature
If refrigerant is supplied to the refrigerant compression chamber through the injection port, then cooling effect is achieved, but the force applied to the spiral element of the orbiting scroll increases
Solution Approach 1:
The invention segments the refrigerant supply system into separate injection ports for the suction chamber and compression chamber. By supplying refrigerant through the suction chamber injection port, the system avoids applying additional force to the orbiting scroll's spiral element while maintaining the cooling effect.
Solution Approach 2:
The suction chamber acts as an intermediary space where refrigerant is injected and expanded before entering the compression chamber. This intermediary pathway allows refrigerant to be cooled without directly increasing pressure or force in the compression chamber's spiral element.
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 minimizes pressure interference with the orbiting scroll's motion, enhancing the efficiency of the scroll compressor by ensuring smoother operation and reduced wear on components.
Implementation Method 1
liquid refrigerant supplied to the refrigerant compression chamber through the injection port expands in the refrigerant compression chamber
Implementation Method 2
The refrigerant is supplied to the refrigerant compression chamber through the injection port, resulting in a reduction in temperature of the refrigerant
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A scroll compressor includes a fixed scroll including a first end plate having an injection passage through which refrigerant is supplied to a refrigerant suction chamber. The injection passage includes an outlet passage section that opens into the refrigerant suction chamber and extends linearly. A refrigerant compression chamber is disposed on an extension of the outlet passage section.