Compressor Rotor Flow-Diffusion Structure for Lower Oil Carryover
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Solution Overview
Problem
The disturbance in gas flow above the stator in compressors due to non-uniform gas discharge from rotor passages leads to increased oil carryover, affecting compressor reliability.
Innovation Solution
A compressor design featuring a lid member and tubular member above the rotor to create a first space where gas is temporarily diffused before discharge, reducing flow disturbance and oil carryover, with additional features like balance weights and gas passages between stator coils to further minimize disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas passages are arranged side by side in the rotor, then gas discharge capacity is improved, but flow velocity becomes non-uniform causing flow disturbance
Solution Approach 1:
A flow uniformizing member is introduced as an intermediary component between the rotor and the space above the stator. This member includes guide surfaces that redirect and uniformize the gas flow discharged from the rotor passages, preventing direct disturbance to the flow above the stator while maintaining the multi-passaging configuration for high discharge capacity
2Productivity
If rotor rotates to discharge gas, then compression function is achieved, but flow disturbance increases oil carryover
Solution Approach 1:
The flow uniformizing member acts as a mediator that decouples the rotational gas discharge from the flow field above the stator. By redirecting flow through guide surfaces, it prevents the periodic disturbance caused by rotor rotation from directly impacting the space above the stator, thereby reducing oil carryover while maintaining compression function
Solution Approach 2:
The flow uniformizing member performs preliminary flow organization before the gas reaches the space above the stator. The guide surfaces pre-uniformize the flow pattern, countering the potential harmful effects of rotational disturbance before it can cause oil carryover
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 design reduces gas flow disturbances above the stator, significantly decreasing oil carryover and enhancing compressor reliability.
Implementation Method 1
The gas temporarily stays in the first space (U), and is diffused in the circumferential direction
Data Source
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AI summary
A compressor includes a compression mechanism, a drive shaft, and an electric motor. The drive shaft extends in the upward/downward direction. The electric motor includes a rotor coupled to the drive shaft and a stator disposed radially outside the rotor. The rotor is provided with first gas passages penetrating the rotor in the upward/downward direction. A lid member and a tubular member are disposed above the rotor. The lid member has a plate shape facing open ends of the first gas passages at an upper end of the rotor. The tubular member is located radially outside the first gas passages and extends downward from the lid member. A gap extending in a circumferential direction of the tubular member is formed between a lower end of the tubular member and the upper end of the rotor. A first space surrounded by the upper end of the rotor, the lid member, and the tubular member and opening radially outward through the gap is formed.