Scroll Compressor Capacity Modulation via Aperture Isolation
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Solution Overview
Problem
Existing scroll compressors lack efficient mechanisms for seamlessly transitioning between full and zero capacity operations, leading to suboptimal performance and energy inefficiencies due to the lack of effective capacity modulation systems.
Innovation Solution
The compressor design incorporates a modulation assembly with a piston and valve assembly that selectively isolates or communicates apertures with the suction pressure region, allowing for operation between full capacity and zero capacity by cycling the piston between positions, and includes a floating seal and biasing member to ensure engagement and disengagement of scroll members, enabling precise control of compressor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If scroll compressors use traditional capacity modulation mechanisms with fluid passages through scroll members, then capacity can be varied, but the transition between full and zero capacity operations is inefficient and causes energy losses
Solution Approach 1:
The modulation assembly dynamically adjusts the aperture opening area to control refrigerant flow between the compression chamber and suction region. By varying the aperture size from fully closed to fully open positions, the system achieves continuous capacity modulation from full to zero capacity while maintaining efficient operation throughout the transition range
Solution Approach 2:
The modulation assembly acts as an intermediary component between the compression chamber and suction region, using a controlled aperture to regulate refrigerant flow. This intermediary mechanism enables smooth capacity transitions without the energy losses associated with traditional on/off modulation approaches
2Productivity
If the compressor operates without an effective capacity modulation system, then the structure remains simple, but performance and energy efficiency deteriorate due to inability to transition between full and zero capacity
Solution Approach 1:
The modulation assembly serves multiple functions: it modulates capacity from full to zero, controls refrigerant flow distribution, and enables efficient part-load operation. This multi-functional component achieves superior performance without requiring multiple separate systems
Solution Approach 2:
The system changes the flow resistance parameter by adjusting the aperture opening area. By varying this geometric parameter continuously, the compressor achieves different capacity levels and optimizes performance across operating conditions without complex mechanical adjustments
Data Source
AI summary
A compressor includes a housing, a first scroll member, a second scroll member and a modulation assembly. The first scroll member includes a first end plate having a discharge passage, a first spiral wrap, and a first aperture extending through the first end plate. The second scroll member includes a second end plate having a second spiral wrap extending therefrom and meshingly engaged with the first spiral wrap to form a series of pockets. The first aperture is in communication with a first of the pockets. The modulation assembly is in communication with the first aperture and is operable in a full capacity mode where the first aperture is isolated from a suction pressure region providing full capacity operation and in a reduced capacity mode where the first aperture is in communication with the suction pressure region providing approximately zero capacity operation.