Rotary Compressor Rotor Core Shielding Oil Separation
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Solution Overview
Problem
In rotary compressors, a mixture of lubricant and refrigerant gas is discharged through communicating channels, leading to inefficient oil separation and potential lubricant shortages, which can reduce the compressor's lifespan and impact the refrigerant circuit's Coefficient of Performance (COP).
Innovation Solution
The rotary compressor design includes a stator-coil gap shielding ratio of 30% to 80% to reduce mixture leakage into the housing, enhancing oil separation efficiency by increasing the amount of mixture collision with the crossover portion, thereby preventing oil from entering the refrigerant circuit and ensuring adequate lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If communicating channels are formed in the crossover portion to allow refrigerant flow, then refrigerant circulation is improved, but lubricant and refrigerant mixture leaks into the housing through these channels
Solution Approach 1:
The rotor core is positioned at a specific height relative to the stator core, creating a localized shielding effect. The covering ratio of 30-80% ensures that the rotor core selectively blocks the communicating channels at critical locations while allowing refrigerant flow elsewhere, thus preventing lubricant leakage without impeding refrigerant circulation.
Solution Approach 2:
The rotor core acts as an intermediary element between the communicating channels and the housing. By positioning the rotor core to cover部分 of the communicating channels, it serves as a mediator that allows refrigerant to pass through while blocking the lubricant-refrigerant mixture from entering the housing.
2Loss of substance
If the rotor core is positioned higher to increase covering ratio, then mixture leakage is reduced, but refrigerant flow through communicating channels may be restricted
Solution Approach 1:
The invention optimizes the covering ratio parameter to a specific range of 30-80%. This parameter optimization balances two competing requirements: enough coverage to prevent lubricant leakage into the housing, but sufficient opening to maintain proper refrigerant circulation through the communicating channels.
3Loss of substance
If oil separator plate is attached to cover the rotor core, then oil separation is improved, but mixture may still escape through communicating channels
Solution Approach 1:
The solution segments the oil separation function into two parts: the oil separator plate handles oil separation in the concave portion, while the rotor core positioning provides an additional segmentation barrier that blocks the communicating channels. This multi-stage segmentation approach ensures comprehensive containment of the lubricant-refrigerant mixture.
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
Improved oil separation efficiency reduces the outflow of refrigerant gas containing oil into the refrigerant circuit, enhancing the system COP and extending the compressor's lifespan by maintaining sufficient lubrication within the housing.
Implementation Method 1
a covering ratio of the open end, which is situated at the entrance side of the communicating channel, by a side face of the rotor core is 30% to 80%, thereby the amount of mixture leaking (escaping) into the barrel of the housing through the communicating channels can be reduced, and the amount of mixture colliding with the crossover portion can be increased, consequently separation efficiency of oil particles can be improved
Data Source
AI summary
A rotary compressor that can improve oil separation efficiency is provided. A rotator (21) is fixed to a crank shaft (16) such that an upper end face (23a) of a rotor core (23) is situated at a position upper than an upper end face (30a) of a stator core (30), and when an open end situated at an entrance side of a communicating channel (35) is seen from an open end situated at an exit side of the relevant communicating channel (35), a covering ratio of the open end, which is situated at the entrance side of the communicating channel (35), by a side face (23b) of the rotor core (23) is 30% to 80%.