Scroll Compressor Partition Wall Oil Reservoir Design
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Solution Overview
Problem
In motor-driven scroll type compressors, excessive lubricating oil from the back-pressure chamber can overflow into the oil extraction passage and directly flow into the flow passage, leading to reduced lubricating oil circulation efficiency, increased pressure loss, and decreased heat exchanging efficiency, thereby deteriorating system performance.
Innovation Solution
A partition wall is introduced between the openings of the oil extraction and flow passages in the oil reservoir to prevent lubricating oil from flowing directly into the flow passage, ensuring that only excess lubricating oil is introduced into the suction chamber, maintaining an optimal oil level and preventing direct flow from the oil extraction passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of lubricating oil in the oil reservoir is increased to ensure sufficient lubrication, then the lubrication performance is improved, but the lubricating oil may overflow from the oil reservoir
Solution Approach 1:
A partition wall is introduced as an intermediary structure between the oil extraction passage and the flow passage. This partition wall acts as a mediator that prevents direct flow of lubricating oil from the extraction passage to the flow passage, while still allowing the system to maintain sufficient oil levels for lubrication.
2Quantity of substance
If a flow passage is formed to return excess lubricating oil to the suction chamber, then the oil level control is improved, but lubricating oil may directly flow into the flow passage from the oil extraction passage, reducing circulation efficiency
Solution Approach 1:
The partition wall serves as an intermediary barrier that prevents direct flow of lubricating oil from the oil extraction passage to the flow passage. This maintains the intended function of the flow passage for returning excess oil to the suction chamber while preventing inefficient direct flow paths.
Solution Approach 2:
The oil reservoir interior is segmented by the partition wall into distinct regions: an oil extraction passage region, a flow passage region, and a suction chamber region. This segmentation prevents direct flow between the extraction passage and flow passage, ensuring that lubricating oil follows the intended path through the suction chamber.
3Stability of the object's composition
If lubricating oil is dispersed by strong jetting force from the oil extraction passage, then the oil distribution is improved, but the lubricating oil directly flows into the flow passage, increasing pressure loss and reducing heat exchanging efficiency
Solution Approach 1:
The partition wall acts as an intermediary that intercepts the jetting lubricating oil from the oil extraction passage before it can directly flow into the flow passage. This maintains effective oil distribution while preventing the energy loss associated with direct flow through the flow passage.
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 solution effectively suppresses the increase of oil rate in the refrigerant circuit, improving the system performance of the compressor by maintaining an appropriate lubricating oil level and preventing direct lubricating oil flow into the flow passage, thus enhancing efficiency and reducing manufacturing costs.
Implementation Method 1
The partition wall is disposed between the openings of the oil extraction passage and the flow passage for restricting lubricating oil from the oil extraction passage other than the excess lubricating oil reserved in the oil reservoir from flowing to the flow passage
Implementation Method 2
The regulating valve is operable to open and close in accordance with the pressure in the back-pressure chamber, and high-pressure refrigerant gas and lubricating oil are introduced into the second oil reservoir from the back-pressure chamber through the oil extraction passage
Implementation Method 3
when the movable scroll member is driven by the electric motor to make an orbital motion, the compression chamber formed between the scroll walls of the fixed and movable scroll members is moved toward the center of the scroll walls while reducing its volume for compression of refrigerant
Implementation Method 4
the flow passage connects the oil reservoir to the suction chamber, and introduces excess lubricating oil into the suction chamber when the level of lubricating oil in the oil reservoir becomes higher than a predetermined level
Data Source
AI summary
A scroll type compressor has a fixed scroll member, a movable scroll member, an oil reservoir, a back-pressure chamber, an oil extraction passage, a flow passage, and a partition wall. The back-pressure chamber disposed behind the movable scroll member is in communication with a discharge chamber. The oil extraction passage having a regulating valve or a throttle connects the back-pressure chamber to the oil reservoir. The oil return passage and the flow passage connect the oil reservoir to a suction chamber, respectively. The flow passage introduces excess lubricating oil into the suction chamber when the level of lubricating oil in the oil reservoir becomes higher than a predetermined level. The partition wall disposed between the openings of the oil extraction passage for restricting lubricating oil from the oil extraction passage other than the excess lubricating oil collected in the oil reservoir from flowing to the flow passage.