Scroll Compressor Balancing with Shaft and Bushing Weights
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Solution Overview
Problem
As the rotational speed of scroll compressors increases, there is a need for improved quietness and low vibration characteristics, which requires further reduction of imbalance among movable components including the drive shaft and components connected to it.
Innovation Solution
The implementation of multiple balancers at strategic positions, such as a shaft balancer integrated with the drive shaft and a bushing balancer integrated with the eccentric bush, with asymmetric and symmetric weight distributions relative to the drive shaft and eccentric bush, respectively, to reduce imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single balancer is used in conventional scroll compressors, then the structure is simple, but the imbalance among movable components cannot be sufficiently reduced at high rotational speeds
Solution Approach 1:
The balancer system is segmented into multiple independent balancers (first balancer integrated with the drive shaft, second balancer integrated with the eccentric bush, and optionally a third balancer integrated with the orbiting scroll). Each balancer independently counterbalances specific imbalance sources, allowing comprehensive vibration reduction while maintaining reasonable structural complexity through modular integration.
2Object-affected harmful factors
If multiple balancers are added to reduce imbalance, then vibration characteristics improve, but the device complexity increases
Solution Approach 1:
Multiple balancers are merged with existing movable components through integration: the first balancer is integrated with the drive shaft, the second balancer with the eccentric bush, and the third balancer with the orbiting scroll. This merging approach allows multiple balancing functions to be achieved without adding standalone components, thereby reducing overall device complexity while effectively reducing imbalance.
3Productivity
If rotational speed is increased to improve productivity, then compression efficiency improves, but imbalance and vibration increase
Solution Approach 1:
Multiple balancers with strategically positioned weights are implemented to counterbalance the increasing imbalance forces generated at high rotational speeds. The first balancer counterbalances drive shaft imbalance, the second balancer counterbalances eccentric bush imbalance, and the third balancer counterbalances orbiting scroll imbalance, allowing the compressor to operate at high speeds with reduced vibration.
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 effectively reduces imbalance among all movable components, enhancing quietness and low vibration characteristics, particularly at higher rotation speeds.
Implementation Method 1
a shaft balancer that is integrated with the drive shaft and includes a first weight disposed on the opposite side from the eccentric pin with respect to the center line of the drive shaft, and a bushing balancer that is integrated with the eccentric bush and includes a second weight disposed on the radially outer side of the eccentric bush and on the opposite side from the center line of the eccentric pin with respect to the center line of the eccentric bush
Data Source
AI summary
[Problem] To reduce imbalance among all movable components of a scroll compressor including a drive shaft and components fixed or connected to the drive shaft. In a scroll compressor 10, a shaft balancer 31 integrated with a drive shaft 30 includes a first weight 33 disposed on the opposite side from an eccentric pin 71 with respect to a center line CL0 of the drive shaft 30, and a bushing balancer 721 integrated with an eccentric bush 72 includes a second weight 723 disposed on the radially outer side of the eccentric bush 72 and on the opposite side from a center line CL1 of the eccentric pin 71 with respect to a center line CL2 of the eccentric bush 72. In a view from the axial direction of the drive shaft 30, the second weight 723 is symmetric with respect to a virtual line passing through the center of the drive shaft 30 and the center of the eccentric bush 72, and the first weight 33 is asymmetric with respect to the virtual line.