Scroll compressor having injection function
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Solution Overview
Problem
In scroll compressors with an injection function, the introduction of liquid refrigerant into the compression chamber leads to decreased heating capacity and reliability due to pressure pulsation, which affects the balance of intermediate pressure control and deteriorates the sliding state of components.
Innovation Solution
A scroll compressor design that includes an intermediate pressure chamber with a check valve to prevent backflow and a liquid reservoir to evaporate any liquid refrigerant, ensuring only gas refrigerant is injected into the compression chamber, maintaining optimal intermediate pressure and lubricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure of the injected refrigerant is increased to increase the injection rate, then the injection rate increases, but liquid refrigerant is injected to the compression chamber causing decrease in heating capacity and reliability
Solution Approach 1:
The intermediate pressure chamber is divided into an upper portion and a lower portion by a partition wall. The lower portion serves as a liquid reservoir that collects liquid refrigerant, while the upper portion handles gas refrigerant injection. This segmentation prevents liquid refrigerant from being injected into the compression chamber while maintaining the liquid reservoir function, thus resolving the contradiction between injection rate and reliability.
2Productivity
If liquid refrigerant is injected to the compression chamber, then the injection rate increases, but the sliding state of components deteriorates causing wear or burn
Solution Approach 1:
The intermediate pressure chamber is segmented into upper and lower portions. The partition wall with a specific height prevents liquid refrigerant from reaching the injection port, ensuring only gas refrigerant is injected. This maintains the sliding state of compression chamber components while allowing high injection rate through the upper portion.
3Adaptability or versatility
If intermediate pressure control balance is broken or transient condition changes, then liquid refrigerant mixes with gas refrigerant, but the mixture is introduced to the compression chamber causing oil washing and component deterioration
Solution Approach 1:
The liquid reservoir in the lower portion of the intermediate pressure chamber preliminarily collects and separates liquid refrigerant before injection. The partition wall height is designed to prevent liquid refrigerant from reaching the injection port even during transient conditions or when intermediate pressure control balance is broken, ensuring only gas refrigerant is injected into the compression chamber.
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 enhances the reliability and efficiency of the compressor by preventing liquid refrigerant from entering the compression chamber, thus maintaining a stable sliding state and optimal intermediate pressure, even during transient conditions.
Implementation Method 1
a liquid reservoir (41b) formed at a position below the intermediate pressure chamber inlet (41a)... the working fluid is evaporated in the liquid reservoir to be converted into the gas-phase working fluid
Implementation Method 2
an intermediate pressure plate (44) and an intermediate pressure cover (45) constituting an intermediate pressure chamber partitioning member... an injection port (43) which injects the intermediate pressure working fluid into the compression chamber
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A compression chamber (15) includes the compression chamber partitioning member (12), an intermediate pressure chamber (41) guids an intermediate pressure working fluid before injection to the compression chamber (15), and the intermediate pressure chamber (41) and the compression chamber (15) face each other with a compression chamber partitioning member (12) interposed between the intermediate pressure chamber and the compression chamber. Further, the intermediate pressure chamber (41) includes an intermediate pressure chamber inlet (41a) through which an intermediate pressure working fluid flows, an injection port inlet (43a) of an injection port (43) through which the intermediate pressure working fluid is injected into the compression chamber (15), and a liquid reservoir (41b) formed at a position below the intermediate pressure chamber inlet (41a), and the liquid reservoir (41b) is formed by the compression chamber partitioning member (12).