Rotary Compressor Bottom Cover Structure for Refrigerant-Oil Control
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Solution Overview
Problem
Conventional rotary compressors face challenges in maintaining efficient operation with hydrocarbon refrigerants due to the high miscibility between refrigerant and lubricating oil, leading to reduced refrigerant charge and compromised safety and efficiency.
Innovation Solution
A rotary compressor design with a specialized bottom cover structure that reduces lubricating oil volume by 55%, maintaining an optimal oil level while ensuring sufficient refrigerant charge, using a condition of 25%≤V/(π(M/2)²H)≤40% to balance oil and refrigerant storage, thereby minimizing refrigerant dissolution and enhancing safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor is filled with sufficient lubricating oil to ensure reliable operation, then the operational reliability is improved, but the refrigerant charge increases due to high miscibility between hydrocarbon refrigerant and lubricating oil
Solution Approach 1:
The bottom cover is divided into a storage cavity and a bearing cavity by a partition wall, separating the lubricating oil storage function from the bearing support function. This segmentation allows the lubricating oil to be confined to the storage cavity, preventing excessive oil from entering the compression chamber and mixing with the refrigerant, thus reducing refrigerant charge while maintaining sufficient lubrication in the bearing cavity.
Solution Approach 2:
The partition wall acts as an intermediary structure between the storage cavity and bearing cavity, controlling the interaction between lubricating oil and refrigerant. It allows the lubricating oil to be stored separately while still providing lubrication to the crankshaft and bearings, mediating between the need for sufficient lubrication and the need to minimize refrigerant-oil mixing.
2Quantity of substance
If the lubricating oil filling volume is reduced to decrease refrigerant charge, then the refrigerant charge is reduced, but the operational reliability may be compromised
Solution Approach 1:
By segmenting the bottom cover into dedicated storage and bearing cavities, the invention ensures that lubricating oil is precisely where needed for reliable operation while preventing excessive oil from contaminating the refrigerant. The partition wall creates distinct zones that maintain adequate lubrication levels without requiring excessive oil filling.
Solution Approach 2:
The partition wall provides localized control over oil distribution, ensuring high oil concentration in the bearing cavity for reliable lubrication while limiting oil presence in the compression chamber area, thereby maintaining operational reliability with reduced overall oil refrigerant mixing.
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 design effectively reduces refrigerant charge, improves safety, and maintains operational efficiency by minimizing refrigerant dissolution in oil, aligning with hydrocarbon refrigerant requirements and simplifying assembly.
Implementation Method 1
At least one spring is located at each of the spring holes of the vane, so that the front end of the vane is in contact with the peripheral surface of the ring
Implementation Method 2
Due to the good solubility between R290 refrigerant and lubricating oils, the more the compressor is filled with oil, the more R290 refrigerant will be dissolved in the refrigerant oil
Data Source
AI summary
A rotary compressor includes a housing, a motor and a compression pump. The housing includes a main shell, a top cover and a bottom cover. The motor is located in the housing. The compression pump is located in the housing and below the motor. The compression pump includes a cylinder. The cylinder includes a first end surface and a second end surface, an oil storage area is formed between the second end surface of the cylinder of the compression pump and a bottom cover of the housing. Wherein a volume of the refrigerant oil in the oil storage area is V, an inner diameter of the main shell is M, a distance between a bottom surface of the bottom cover and a bottom surface of the cylinder of the compression pump is H, a circumference is IT, and the following condition is satisfied: 25%≤V/(π(M/2)2H)≤40%.