Scroll Compressor Asymmetrical Spiral Dual Injection Ports
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Solution Overview
Problem
Conventional scroll compressors using HFO refrigerant with a global warming potential lower than HFC refrigerant face limitations in refrigeration capacity and coefficient of performance (COP) due to limited injection flow rate and increased discharge temperature, which can lead to compressor failure and efficiency decreases.
Innovation Solution
A scroll compressor with an asymmetrical spiral structure featuring a larger winding angle for the stationary scroll and a smaller winding angle for the orbiting scroll, along with two injection ports, where the second injection port has a higher flow rate than the first, to ensure refrigeration capacity equivalent to HFC refrigerant while reducing input and maintaining COP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single injection port is used to inject refrigerant into compression chambers, then the device complexity is reduced, but the injection flow rate is limited and discharge temperature cannot be lowered enough
Solution Approach 1:
The single injection port is divided into multiple injection ports (first injection port and second injection port) that inject refrigerant into different compression chambers (first compression chamber and second compression chamber) respectively. This segmentation allows each port to be optimized for its specific compression chamber, enabling better discharge temperature control without excessive complexity.
Solution Approach 2:
Different injection ports are configured with different characteristics suited to their respective compression chambers. The first injection port is designed for the first compression chamber while the second injection port is designed for the second compression chamber, allowing local optimization of injection flow rates and positions to control discharge temperatures effectively.
2Reliability
If injection pressure is increased to ensure injection flow rate, then the injection flow rate is improved, but the input of the compressor increases and coefficient of performance decreases
Solution Approach 1:
Instead of uniformly increasing injection pressure, the patent optimizes different parameters for each injection port including injection flow rates, injection positions, and port areas. The second injection port is configured with a larger area and optimized position to provide higher injection flow rate into the second compression chamber, achieving reliable cooling without excessive pressure increase and maintaining compressor efficiency.
3Productivity
If asymmetrical spiral structure with larger winding angle of stationary scroll is used, then suction volume is increased and refrigeration capacity is improved, but discharge temperature increases and causes oil deterioration
Solution Approach 1:
The compression process is segmented into multiple compression chambers with different characteristics. The first compression chamber and second compression chamber receive refrigerant injection at different stages and with different flow rates, allowing the asymmetrical spiral structure to maintain high suction volume while the injection system controls discharge temperature by cooling specific chambers.
Solution Approach 2:
Refrigerant injection acts as an intermediary cooling mechanism. By injecting refrigerant into the compression chambers through optimally positioned and sized ports, the system mediates between the high discharge temperature caused by the asymmetrical spiral structure and the need to maintain refrigeration capacity, cooling the refrigerant at specific points in the compression process.
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 asymmetrical spiral structure and dual injection ports ensure refrigeration capacity equivalent to HFC refrigerant, reduce input requirements, and stabilize the orbiting scroll's behavior, thereby improving the compressor's reliability and efficiency.
Implementation Method 1
the first wrap and the second wrap being configured to form a plurality of compression chambers between the first wrap and the second wrap
Implementation Method 2
there is a known technique for injecting refrigerant of an intermediate pressure into a compression chamber via one injection port to cool and lower a discharge temperature
Data Source
AI summary
A scroll compressor in which a winding angle of a first lap is larger than a winding angle of a second lap, a plurality of compression chambers are formed between the first lap and the second lap, the compression chambers include at least a first compression chamber and a second compression chamber that has a volume smaller than the first compression chamber, a first base plate is provided with a first injection port 16a for injection of refrigerant into the first compression chamber and a second injection port for injection of refrigerant into the second compression chamber, and an injection flow rate of the second injection port is higher than an injection flow rate of the first injection port.