Rotary Compressor Oil Separation Plate Design
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Solution Overview
Problem
Conventional rotary compressors face increased manufacturing costs due to complex oil separation plate designs requiring large material amounts, multi-step press-molding, and additional processing steps, which elevate processing time and costs.
Innovation Solution
A rotary compressor with a hermetically-sealed upright cylindrical casing featuring a simple oil separation plate design with a central cylindrical portion, curved radial portion, and outer peripheral disk, fixed by rivets, allowing for cost-effective press-molding and reduced assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex oil separation plate design with radial spacers is used, then oil separation efficiency is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The oil separation plate is divided into multiple functional regions: a central through-hole for drive shaft passage, radial spacers extending from the center to create separation zones, and an outer peripheral edge. This segmentation allows each region to perform its specific function while maintaining overall simplicity in manufacturing.
2Reliability
If a thick oil separation plate with complex shape is used, then oil separation performance is improved, but material consumption and manufacturing cost increase
Solution Approach 1:
Instead of making the entire plate thick, the invention uses localized thickness only where needed for oil separation functionality. The radial spacers create separation zones with sufficient thickness at critical locations, while other areas remain thin, reducing overall material consumption while maintaining oil separation performance.
3Manufacturing precision
If multi-step press-molding and additional processing steps are used, then manufacturing precision is improved, but processing time and productivity decrease
Solution Approach 1:
The invention combines the oil separation plate formation with the rotor press-molding process into a single integrated operation. The plate is formed together with the rotor body in one press-molding step, eliminating subsequent separate manufacturing and assembly steps, thereby improving productivity without sacrificing precision.
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 reduces manufacturing and assembly costs by simplifying the oil separation plate design, enabling efficient centrifugal oil separation and refrigerant gas management, thereby improving oil separation efficiency and reducing processing time.
Implementation Method 1
an approximately disk-shaped oil separation plate held away at a predetermined interval from the upper end of the gas flow path and rotated together with the rotor
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A rotary compressor (1) includes a compressor casing (10) which includes a compression unit (12) for sucking refrigerant gas from a low pressure side of a refrigerating cycle and ejecting the gas to a high pressure side of the refrigerating cycle, and a motor (11) for driving the compression unit (12) through a rotating shaft (15). The compressor (1) has a gas hole (112A) formed on a rotor (112) of the motor (11) for causing a refrigerant gas below the motor (11) to pass upward, and an oil separation plate (119) having a central cylindrical portion, a curved portion continuous to the central cylindrical portion and curved in a radial direction, and an outer peripheral disk portion continuous to the curved portion and is fixed on the rotor (112) by a rivet (115) so that a lower end portion of the central cylindrical portion comes into close contact with the upper end of the rotor (112) or an upper end plate of the rotor (112).