Compressor Rotor Balancing Weights Without Axial Size Growth
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Solution Overview
Problem
Existing scroll-type compressors face challenges in easily correcting imbalance in rotating bodies and suppressing axial size increase when balancing weights are provided.
Innovation Solution
A rotor design featuring a first and second balancing weight on opposite axial ends of the rotor core, with extending portions that utilize dead spaces between stator and compressor housing to correct imbalance while minimizing axial size increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If balancing weights are provided on the rotor to correct imbalance in rotating bodies, then imbalance correction is improved, but axial size increases
Solution Approach 1:
The balancing weight extends in the radial direction rather than only in the axial direction. The radial-direction extending portion projects toward the outer side in the radial direction of the rotor core, utilizing the radial dimension to provide balancing mass without increasing axial length. This dimensional shift resolves the contradiction by achieving imbalance correction through radial extension instead of axial extension.
Solution Approach 2:
The balancing weight is strategically positioned with its radial-direction extending portion disposed in the dead space between the stator and compressor housing. This local placement utilizes otherwise wasted space in the radial direction to provide balancing mass, achieving imbalance correction without compromising axial compactness of the main compressor structure.
2Reliability
If balancing weights are provided on the rotor to correct imbalance, then operational smoothness is improved, but device complexity increases
Solution Approach 1:
The balancing weight is integrated with the rotor core through fixation, merging the balancing function into the existing rotor structure. The fixing portion is fixed to an end surface of the rotor core, combining the balancing weight with the rotor assembly rather than treating it as a separate component, thereby reducing overall device complexity while maintaining operational smoothness.
Solution Approach 2:
The rotor structure serves multiple functions: it provides the rotating mass for compression while also incorporating the balancing weight function through the radially extending portion. This multi-functionality eliminates the need for separate balancing mechanisms, reducing device complexity while achieving operational smoothness.
3Length of moving object
If radial-direction extending portion is disposed in dead space between stator and compressor housing, then axial size is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The radial-direction extending portion of the balancing weight utilizes the existing dead space between the stator and compressor housing without requiring additional clearance or precision adjustments. The design allows the balancing weight to occupy otherwise wasted space, eliminating the need for increased manufacturing precision while achieving axial size suppression.
Data Source
AI summary
A rotor includes a rotor core, a first balancing weight, and a second balancing weight. The first balancing weight is provided on an end surface on one side in an axial direction of the rotor core. The second balancing weight is provided on an end surface on another side in the axial direction of the rotor core.