Scroll Compressor Injection Port and Bypass Design
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Solution Overview
Problem
Symmetric scroll compressors face challenges in maintaining balanced injection rates between compression chambers, leading to inefficient operation and reduced heating capacity due to differences in injection amounts, which affects the compressor's reliability and efficiency.
Innovation Solution
The scroll compressor design includes a fixed scroll and an orbiting scroll with strategically positioned injection ports and discharge bypass ports to ensure equal suction and discharge volumes in both compression chambers, allowing for optimized injection and discharge processes, thereby maximizing the injection cycle effect and improving efficiency and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the intermediate pressure is increased to increase the injection rate, then the injection rate increases, but the liquid refrigerant component ratio increases causing liquid refrigerant to flow into the injection pipe
Solution Approach 1:
The gas-liquid separator performs preliminary separation of gas and liquid refrigerant before injection. The expansion valve upstream of the separator preliminarily controls the refrigerant state to ensure only gas refrigerant is injected, preventing liquid refrigerant from entering the compression chamber before the injection process begins.
Solution Approach 2:
The gas-liquid separator acts as an intermediary component between the expansion valve and the injection pipe. It mediates the refrigerant flow by separating gas and liquid phases, allowing only gas refrigerant to proceed to the injection pipe while preventing liquid refrigerant from reaching the injection point.
2Quantity of substance
If the intermediate pressure is increased to increase the injection rate, then the injection rate increases, but the heating capacity decreases due to liquid refrigerant injection
Solution Approach 1:
The gas-liquid separator performs preliminary separation of gas and liquid refrigerant before injection. The expansion valve upstream of the separator preliminarily controls the refrigerant state to ensure only gas refrigerant is injected, preventing liquid refrigerant from entering the compression chamber before the injection process begins.
Solution Approach 2:
The gas-liquid separator acts as an intermediary component between the expansion valve and the injection pipe. It mediates the refrigerant flow by separating gas and liquid phases, allowing only gas refrigerant to proceed to the injection pipe while preventing liquid refrigerant from reaching the injection point.
3Quantity of substance
If liquid refrigerant is injected to the compression chamber, then the injection rate increases, but the oil is washed by liquid refrigerant causing sliding state deterioration
Solution Approach 1:
The gas-liquid separator performs preliminary separation of gas and liquid refrigerant before injection. The expansion valve upstream of the separator preliminarily controls the refrigerant state to ensure only gas refrigerant is injected, preventing liquid refrigerant from entering the compression chamber before the injection process begins.
Solution Approach 2:
The gas-liquid separator acts as an intermediary component between the expansion valve and the injection pipe. It mediates the refrigerant flow by separating gas and liquid phases, allowing only gas refrigerant to proceed to the injection pipe while preventing liquid refrigerant from reaching the injection point.
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 design enhances the compressor's ability to handle higher injection rates, preventing excessive compression, and maintains reliability by ensuring balanced pressure and efficient refrigerant flow, resulting in improved performance and capacity expansion compared to previous technologies.
Implementation Method 1
an injected refrigerant is fed into the compression chamber by a pressure difference between the intermediate pressure and the internal pressure of the compression chamber in the compressor to which the injection pipe is finally connected
Implementation Method 2
in the refrigerant introduced into the compression chamber from an injection pipe, the gas refrigerant is preferentially extracted from a gas-liquid separator and is fed
Data Source
Figure 1
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Figure 3
AI summary
In a scroll compressor according to the present invention, at least one injection port penetrating a second end plate of a fixed scroll (12) at a position where the injection port is open to a first compression chamber (15a) or a second compression chamber (15b) in a compression stroke after the suction refrigerant is introduced and closed. Further, the discharge bypass port (21) is disposed such that a volume ratio, which is a ratio of a suction volume to a discharge volume of the second compression chamber (15b) at which the refrigerant in the first compression chamber (15a) can be discharged, is smaller in the first compression chamber (15a), which is one compression chamber having the large amount of the refrigerant injected from the injection port (43), than in the second compression chamber (15b), which is the other compression chamber among the first compression chamber (15a) and the second compression chamber (15b).