Multistage Compressor Oil Separation Plate Segmentation
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Solution Overview
Problem
In multistage compressors, the existing oil separation mechanisms are ineffective in ensuring lubricating oil interferes with the stator coil end, leading to inefficient separation and potential oil circulation issues, which hinder system efficiency and cause lubricating oil shortages.
Innovation Solution
The multistage compressor incorporates an oil separation plate fixed between segments of a balance weight, positioned lower than the stator coil end, with a bent part to enhance interference and a notch for improved assembly, ensuring effective lubricating oil separation and reduced oil circulation ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oil separation plate is provided to centrifugally separate lubricating oil from intermediate-pressure refrigerant gas, then lubricating oil separation is improved, but the lubricating oil may not interfere with the stator coil end effectively if the balance weight height exceeds the stator coil end height
Solution Approach 1:
The balance weight is divided into a plurality of segments in the height direction, with the oil separation plate fixed between adjacent segments. This segmentation allows the oil separation plate to be positioned at an appropriate height below the stator coil end, ensuring that separated lubricating oil can effectively interfere with the stator coil end while maintaining reliable oil separation functionality.
2Ease of manufacture
If the oil separation plate is fixed using conventional fixing members, then assembly is simplified, but the fixing strength is insufficient leading to potential loosening during long-term use
Solution Approach 1:
The balance weight is segmented into multiple sections, and the oil separation plate is fixed between adjacent segments. This segmentation approach enables the use of multiple fixing members distributed across different segments, collectively providing sufficient fixing strength to prevent loosening during long-term operation while maintaining assembly simplicity.
Solution Approach 2:
Different portions of the balance weight have different structures: segments are provided in the height direction to enable flexible fixing of the oil separation plate, while the overall balance weight maintains its weight and centrifugal separation functionality. This local quality differentiation optimizes both fixing strength and assembly ease.
3Stability of the object's composition
If the oil separation plate is positioned higher to ensure balance weight functionality, then rotational balance is maintained, but lubricating oil separation effectiveness is reduced
Solution Approach 1:
By segmenting the balance weight in the height direction and fixing the oil separation plate between segments, the design allows the oil separation plate to be positioned at an optimal height that ensures both rotational balance of the balance weight and effective oil separation, resolving the conflict between these two requirements.
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 ensures reliable interference of separated lubricating oil with the stator coil end, improving separation efficiency and reducing oil circulation ratio, thereby enhancing system efficiency and preventing lubricating oil shortages.
Implementation Method 1
an oil separation plate 45 which the rotating shaft 7 penetrates and which centrifugally separates, by collision, the lubricating oil 12 contained in the intermediate-pressure refrigerant gas sucked into the high stage-side compression mechanism 3 after passing through gas passages 6A in the rotor 6
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
There is provided a multistage compressor that causes lubricating oil separated from an intermediate-pressure refrigerant gas by an oil separation plate to interfere with a stator coil end regardless of the height of a balance weight in which an oil separation plate is provided. The multistage compressor includes an electric motor (4) provided in a sealed housing (10); a low stage-side compression mechanism (2) and a high stage-side compression mechanism (3) which are provided under and over the electric motor (4), respectively, with the electric motor (4) being held therebetween; a balance weight (70) that is formed by a lower segment (71) and an upper segment (72) and assures rotational balance of a rotation shafting including a rotating shaft (7); and an oil separation plate (73) that centrifugally separates lubricating oil (12) contained in the refrigerant gas sucked into the high stage-side compression mechanism (3). On one end side of a rotor (6), the oil separation plate (73) is fixed to the rotor 6 by being held between the lower segment (71) and the upper segment (72).