Scroll Compressor Back Pressure Chamber Orifice Design
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Solution Overview
Problem
Conventional scroll compressors experience internal leaks and deteriorated volume efficiency under high pressure conditions due to insufficient back pressure in the back pressure chamber, leading to reduced refrigerant flow into the back pressure chamber.
Innovation Solution
The design incorporates a first depressurized member with a lower depressurized resistance value than a second depressurized member, with specific configurations such as spiral parts and orifice lengths, to enhance the back pressure in the back pressure chamber by adjusting the depressurized resistance values and passage spacings, ensuring more refrigerant flows into the back pressure chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the depressurized resistance values of the first and second orifices are equally configured, then the structure is simple and manufacturing is easy, but the back pressure in the back pressure chamber is insufficient under high pressure conditions, causing internal leaks and deteriorated volume efficiency
Solution Approach 1:
The patent applies local quality by configuring the first orifice (in the oil recovery passage) and the second orifice (in the back pressure chamber passage) with different depressurized resistance values. Specifically, the first orifice has a smaller hole diameter than the second orifice, creating localized differences in flow resistance at different positions in the system. This allows the oil recovery passage to have higher resistance for effective oil separation while the back pressure chamber passage has lower resistance to maintain sufficient back pressure and prevent internal leaks.
2Reliability
If the first orifice has a smaller hole diameter to increase its depressurized resistance, then oil separation is improved, but the refrigerant flow into the back pressure chamber is reduced, worsening the back pressure condition
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the hole diameters of the first and second orifices to achieve optimal depressurized resistance values. The first orifice is configured with a smaller hole diameter (e.g., 0.5-1.5mm) to increase resistance for oil separation, while the second orifice has a larger hole diameter (e.g., 2.0-3.0mm) to maintain lower resistance for refrigerant flow. This parameter optimization ensures that the sum of depressurized resistances in the back pressure chamber passage is less than or equal to that in the oil recovery passage, balancing oil separation efficiency with sufficient back pressure.
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 maintains or enhances volume efficiency by increasing the back pressure in the back pressure chamber, effectively preventing internal leaks and improving the refrigerant flow under high pressure conditions.
Implementation Method 1
a first depressurized member disposed on a first oil recovery passage formed between the oil separator of the discharge chamber and the branch point in the oil recovery part, and for depressurizing the refrigerant; and a second depressurized member disposed on a second oil recovery passage formed between the branch point and the suction chamber passage in the oil recovery part, and for depressurizing the refrigerant
Data Source
AI summary
The present disclosure relates to a scroll compressor, and it is possible to constitute a depressurized resistance value of a first orifice disposed on an oil recovery part to be lower than a depressurized resistance value of a second orifice, thereby maintaining/enhancing volume efficiency upon driving under a high pressure condition where a pressure of discharged refrigerant is high by increasing the back pressure of a back pressure chamber.