Compressor and refrigeration device with an oil return channel having a first relative distance to an inner-side wall
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Solution Overview
Problem
In compressors, the fluctuation of lubricating oil levels and increased oil circulation ratio due to pressure differences and refrigerant entry through oil return channels lead to reduced recovery efficiency and reliability, especially under varying operating conditions.
Innovation Solution
A compressor design with an oil return channel configuration that includes an oil inlet with a dividing line parallel to the horizontal plane of the motor's central axis, where the dividing line divides the inlet into two areas, ensuring the lubricating oil flows effectively from the first cavity to the second cavity, reducing the oil circulation ratio and stabilizing oil levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil return channel is disposed in the compression assembly to enable oil circulation, then the oil recovery efficiency is improved, but the refrigerant may enter the oil cavity through the oil return channel along with the lubricating oil under pressure difference, causing oil level fluctuation and increased oil circulation ratio
Solution Approach 1:
The oil return channel is segmented into multiple sections: a first oil return channel section extending from the first cavity toward the second cavity, and a second oil return channel section extending from the first oil return channel section to the second cavity. This segmentation allows the oil to change direction and reduces the likelihood of refrigerant entering the oil cavity along with the oil.
Solution Approach 2:
The oil return channel is positioned at a specific height relative to the motor's central axis, and the first oil return channel section extends in a direction that is not parallel to the central axis. This spatial arrangement in multiple dimensions ensures that the oil return channel operates in a region less affected by refrigerant flow, reducing harmful refrigerant entry while maintaining effective oil recovery.
2Productivity
If the oil return channel allows free flow of lubricating oil under pressure difference, then the oil circulation is improved, but the oil level in the motor cavity fluctuates significantly, especially under varying working conditions
Solution Approach 1:
The patent specifies precise geometric parameters for the oil return channel, including the angle range (30° to 60°) of the first oil return channel section relative to the motor's central axis, and the height position (5mm to 15mm above the central axis). These parameter optimizations balance oil circulation efficiency with oil level stability, ensuring reliable operation across varying working conditions.
3Loss of substance
If the oil return channel is positioned closer to the motor cavity to improve oil recovery, then the oil circulation ratio is reduced, but the refrigerant entry risk increases
Solution Approach 1:
The oil return channel is positioned in the vertical dimension above the motor's central axis (5mm to 15mm height), and the first oil return channel section extends in a direction angled at 30° to 60° relative to the central axis. This multi-dimensional positioning places the oil return channel in a region where oil can be effectively recovered while minimizing exposure to refrigerant flow paths, thus reducing both oil circulation ratio and refrigerant contamination risk simultaneously.
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 configuration improves lubricating oil recovery efficiency, stabilizes oil levels, and reduces the oil circulation ratio, enhancing the reliability and energy efficiency of the compressor across different operating conditions.
Implementation Method 1
the lubricating oil in the motor cavity is pressurized to the oil cavity under the effect of pressure difference
Data Source
AI summary
A compressor and a refrigeration device are provided. The compressor has a shell, a compression assembly, a motor, an oil sump and an oil return channel. The shell defines a cavity. A part of the compression assembly is connected to the shell and located in the cavity. The cavity is divided into a first cavity and a second cavity by the compression assembly. A part of the motor is arranged in the first cavity. A part of the shell located below the central axis of the motor is a first shell. The oil sump is arranged in the second cavity. The oil return channel is arranged in the compression assembly, and is provided with an oil inlet facing the first cavity.