Rotary Compressor Housing Layout for Low Refrigerant Dissolution
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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 housing structure that includes an oil storage area between the cylinder and bottom cover, reducing lubricating oil volume by 55% while maintaining optimal refrigerant level, ensuring the refrigerant and oil are not mixed excessively, thus enhancing safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor is filled with sufficient lubricating oil to ensure operational reliability, then the reliability of compressor operation is improved, but the refrigerant charge in the compressor housing increases, reducing safety and operational efficiency when using hydrocarbon refrigerants
Solution Approach 1:
The patent divides the oil storage function into two separate locations: a traditional oil sump at the bottom and a newly created oil storage cavity in the piston crown. This segmentation allows the compressor to maintain sufficient total oil for reliable operation while physically separating the oil from the main compression chamber, thereby reducing the refrigerant charge in the housing and improving safety when using hydrocarbon refrigerants.
2Quantity of substance
If the lubricating oil filling volume is reduced to reduce refrigerant charge, then the safety and operational efficiency are improved, but the reliability of operation may be compromised
Solution Approach 1:
The patent incorporates an oil storage cavity into the piston crown structure in advance, which is pre-filled with a specific amount of lubricating oil (5-15ml). This preliminary action ensures that sufficient oil is available for reliable operation from the start, while the total oil volume is controlled to reduce refrigerant charge and improve safety when using hydrocarbon refrigerants.
3Reliability
If more lubricating oil is used to ensure oil level height, then the operational reliability is improved, but more R290 refrigerant is dissolved in the refrigerant oil, reducing compressor performance and operation efficiency
Solution Approach 1:
The patent adds a new spatial dimension for oil storage by creating a cavity within the piston crown (a three-dimensional space within an existing component). This allows oil to be stored in a previously unused dimension, maintaining sufficient oil for reliable operation while minimizing the oil volume in the main compression chamber, thereby reducing refrigerant dissolution and maintaining high compressor operation efficiency.
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
The basic working principle of the compressor is as follows: when the compressor is energized, the stator generates a magnetic field, which rotates the rotor, drives the crankshaft, and causes the rings to move eccentrically in the cylinder
Implementation Method 3
when the compressor is energized, the stator generates a magnetic field, which rotates the rotor, drives the crankshaft
Data Source
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AI summary
A rotary compressor includes a housing (11), a motor (12) and a compression pump (13). The housing includes a main shell (111), a top cover (112) and a bottom cover (113). 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 (131). The cylinder includes a first end surface (1311) and a second end surface (1312), an oil storage area (110) 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 π, and the following condition is satisfied: 25% ≤ V/(π(M/2)2H) ≤ 40%.