Compressor Rotor Venting With Oil Baffle Shield for Oil Return
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Solution Overview
Problem
In rotary compressors, refrigerator oil tends to accumulate near the exhaust side of the stator, leading to a high discharge amount and a lowered oil level in the sump, affecting lubrication and efficiency.
Innovation Solution
A rotor assembly with a vent hole in the rotor core and an oil baffle shield covering the balance weight, utilizing pressure differences to separate oil droplets and enhance refrigerant flow, reducing oil discharge through the vent hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the balance weight rotates at high speed to separate oil droplets, then oil-gas separation effect is improved, but oil droplets accumulate near the exhaust side of the stator forming a secondary source
Solution Approach 1:
The invention extracts the accumulated oil droplets from the harmful accumulation zone near the exhaust side by introducing a vent hole in the rotor core. This vent hole actively draws out oil droplets that would otherwise accumulate and form a secondary discharge source, separating them from the harmful location and channeling them back to the oil sump.
Solution Approach 2:
The vent hole acts as an intermediary structure between the rotation area of the balance weight and the oil sump. It mediates the movement of oil droplets by utilizing the pressure difference created during balance weight rotation to transport oil from the separation zone back to the sump, preventing secondary accumulation.
2Speed
If the balance weight rotates to push gas outward, then centrifugal separation is improved, but a secondary source of oil droplets forms near the exhaust side
Solution Approach 1:
The vent hole extracts oil droplets from the rotation area of the balance weight where they would otherwise accumulate due to high-speed rotation. By providing this extraction path, the invention prevents the formation of a secondary oil source near the exhaust side while maintaining the beneficial centrifugal separation effect.
Solution Approach 2:
The invention converts the harmful effect of high-speed rotation that causes oil accumulation into a beneficial force by utilizing the pressure difference generated during balance weight rotation. This pressure difference is harnessed through the vent hole to actively draw oil droplets back to the sump, transforming the harmful accumulation mechanism into a useful oil return mechanism.
3Quantity of substance
If oil droplets are thrown outward in a concentrated way, then oil return to sump is improved, but refrigerant flow may be disrupted
Solution Approach 1:
The vent hole is positioned specifically in the rotor core at a location where it can effectively extract oil droplets without interfering with the main refrigerant flow path. This localized placement ensures that oil removal occurs in a specific zone while the bulk refrigerant flow remains uninterrupted, maintaining both oil return capacity and refrigerant productivity.
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 solution increases refrigerant flow rate and improves oil return capacity, thereby reducing oil discharge and maintaining stable oil levels, enhancing compressor efficiency.
Implementation Method 1
a high-speed rotating airflow is formed when a balance weight is rotated, so that refrigerator oil droplets carried in a refrigerant are gradually deviated from an axial center of the compressor under a centrifugal action
Implementation Method 2
rotation of the balance weight may cause gas in a rotation area of the balance weight to be pushed to the outside, and a local negative pressure is formed in the rotation area. When the balance weight is covered by the oil baffle shield, there is a local low pressure at the central opening of the oil baffle shield. And on an inner wall surface of the oil baffle shield, since a refrigerant cannot smoothly flow out, a local high pressure is formed close to a side wall due to a stagnation effect, which may push the refrigerant to flow from one side close to the oil baffle shield to one side away from the oil baffle shield through the vent hole
Data Source
AI summary
A rotor assembly and a compressor are provided. The rotor assembly has a crankshaft, a rotor core, a balance weight and an oil baffle shield. The rotor core is provided with a vent hole. The vent hole extends through the rotor core along an axial direction of the rotor core. The balance weight is located at one end of the rotor core approximate to an oil sump of the compressor. The oil baffle shield is arranged to cover the balance weight and is provided with a central opening. The crankshaft extends through the central opening. An accommodating space is defined between the oil baffle shield and the rotor core. The accommodating space is communicated with the vent hole.