Dual-Stage Scroll Compressor Capacity Control With Low Variation Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing variable-capacity scroll compressors face challenges in reducing capacity variation ratios, especially under low-speed and low-pressure ratio conditions, leading to inefficiencies and increased manufacturing costs due to complex structures and potential malfunctions.
Innovation Solution
A dual-stage scroll compressor design with capacity varying parts that induce refrigerant leakage or block suction into compression chambers, utilizing communication holes, valves, and back pressure chambers to adjust capacity, and eccentric load cancellation for reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate control device and piping are disposed inside or outside the casing to vary compression capacity, then capacity variation is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention merges the capacity control function with the existing suction port structure. The suction port serves dual purposes: as the normal refrigerant intake passage and as the control element for capacity variation. By opening or closing the suction port, the compressor achieves capacity control without requiring separate control devices or additional piping systems.
Solution Approach 2:
The suction port is designed to perform multiple functions: it serves as the refrigerant suction passage during normal operation and as the capacity control mechanism when opened or closed. This multi-functional design eliminates the need for dedicated control components, simplifying the overall device structure while maintaining capacity variation capability.
2Adaptability or versatility
If separate piping and control device are disposed outside the casing, then capacity control is achieved, but manufacturing cost and assembly difficulty increase
Solution Approach 1:
The invention integrates the capacity control function into the existing suction port structure rather than adding separate external piping and control devices. The suction port itself becomes the control element, eliminating the need for additional machining and assembly operations for separate control components.
3Adaptability or versatility
If capacity variation is achieved through related art methods, then partial load operation is possible, but capacity variation ratio cannot be sufficiently lowered
Solution Approach 1:
The invention dynamically controls the suction port opening based on operating conditions. During partial load operation, the suction port is opened to allow refrigerant to bypass the compression chamber, effectively reducing the compression capacity. This dynamic control mechanism enables the compressor to adapt to varying load requirements while maintaining a low capacity variation ratio.
Solution Approach 2:
The suction port is divided into a main suction passage and a bypass passage controlled by the opening/closing mechanism. This segmentation allows selective routing of refrigerant flow - either through the compression chamber for full capacity operation or through the bypass for reduced capacity operation, enabling precise control over the capacity variation ratio.
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
The design allows for easy capacity variation with a significantly reduced capacity variation ratio, enhancing energy efficiency and reliability while simplifying the structure and reducing manufacturing costs.
Implementation Method 1
a first orbiting scroll and a second orbiting scroll that are configured to orbitally move along a first rotation axis and a second rotation axis respectively
Implementation Method 2
a capacity varying part configured to idle the corresponding compression part by inducing refrigerant leakage from a compression chamber
Data Source
AI summary
A scroll compressor is provided. The scroll compressor comprises: a first compression part comprising a first stationary scroll and a first orbiting scroll; and a second compression part comprising a second stationary scroll and a second orbiting scroll, wherein at least one of the first compression part and the second compression part may have a capacity variable part equipped therein so as to induce refrigerant discharge from a compression chamber or to induce idling by blocking refrigerant suction in the compression chamber. The above configuration facilitates varying the capacity of the compressor while significantly reducing the capacity variation ratio, thereby increasing the energy efficiency of the compressor and the air conditioner equipped therewith.