Scroll Compressor Rotor Balancing Through Flow Hole Geometry
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Solution Overview
Problem
Existing scroll electric compressors face challenges in reducing the number of parts and downsizing in the axial direction while effectively canceling centrifugal forces generated by the movable and rotor weights.
Innovation Solution
A scroll electric compressor design featuring a rotor with balance adjustment portions formed by varying the radial dimensions of fluid flow holes, utilizing balance weights and balance adjustment portions to cancel centrifugal forces without additional parts, and optimizing the center of gravity through adjustable weight portions in the rotor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If balance weights and additional balance adjustment parts are added to cancel centrifugal forces, then centrifugal force cancellation is improved, but the number of parts increases and axial size increases
Solution Approach 1:
The balance adjustment portions are integrated directly into the rotor structure, merging the balance adjustment function with the rotor itself. This eliminates the need for separate balance weights and additional balance adjustment parts, thereby reducing the number of parts while maintaining effective centrifugal force cancellation through the balance adjustment portions formed by varying radial dimensions of fluid flow holes in the stacking steel plates
Solution Approach 2:
The rotor serves multiple functions: it generates centrifugal force through rotation, provides structural support, enables fluid flow through its holes, and performs balance adjustment through its varying radial dimensions. By making the rotor multi-functional, the invention eliminates the need for dedicated balance adjustment parts, reducing overall part count while maintaining all necessary functions
2Reliability
If balance weights and additional balance adjustment parts are added to cancel centrifugal forces, then centrifugal force cancellation is improved, but axial size increases
Solution Approach 1:
The balance adjustment function is merged into the rotor structure itself, eliminating the need for separate axial extensions or additional components. The balance adjustment portions are formed by varying the radial dimensions of fluid flow holes within the existing rotor volume, maintaining compact axial dimensions while achieving effective centrifugal force cancellation
3Ease of manufacture
If standard uniform stacking steel plates are used for the rotor, then manufacturing is simplified, but balance adjustment capability is lost
Solution Approach 1:
The stacking steel plates maintain uniformity in most areas for ease of manufacture, but incorporate local variations in the radial dimensions of fluid flow holes at specific positions. These localized non-uniformities create the necessary balance adjustment portions without requiring completely custom-made plates, thus balancing manufacturing simplicity with balance adjustment capability
Solution Approach 2:
The invention adjusts the radial dimensions of fluid flow holes in the stacking steel plates to create balance adjustment portions. By changing these geometric parameters locally within the rotor structure, the system achieves balance adjustment capability while still using standardized stacking steel plates for the majority of the rotor construction
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
Reduces the number of parts and axial size of the rotor while effectively canceling centrifugal forces, improving material yield and maintaining balanced operation.
Implementation Method 1
a centrifugal force generated by orbital motion of a movable scroll as an orbiting scroll acts on the drive shaft, and a centrifugal force generated by the balance weight acts on the drive shaft. In addition, when the scroll electric compressor is operated, a centrifugal force generated by the rotor weight also acts on the drive shaft through a rotor. In the scroll electric compressor, the centrifugal force by the movable scroll acting on the drive shaft is cancelled with the centrifugal force generated by the balance weight and the centrifugal force generated by the rotor weight
Data Source
AI summary
A scroll electric compressor includes a rotary shaft, a motor including a rotor, a compression part, a housing, a balance weight, a plurality of stacking steel plates stacked in the axial direction to form the rotor, the rotor having a plurality of fluid flow holes, the stacking steel plates each having a plurality of flow holes and being stacked so that the flow holes form the fluid flow holes. The rotor has a balance adjustment portion that cancels a centrifugal force generated by the balance weight. The stacking steel plates have weight portions that are formed by reducing a radial dimension of at least one of the flow holes as compared to a radial dimension of the other of the flow holes that overlaps the balance weight in the axial direction, and the balance adjustment portion is formed by stacking the weight portions in the axial direction.