Scroll Compressor Balancer Layout for High-Speed Vibration Control
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Solution Overview
Problem
Existing scroll compressors fail to balance moments generated by the bushing balancer and moments generated by the orbiting shaft, which are not balanced by the orbiting shaft, which are not balanced by the orbiting shaft, leading to increased vibration and imbalance at high rotation speeds.
Innovation Solution
The scroll compressor incorporates a shaft balancer with a center of gravity located on the opposite side of the eccentric shaft axis and a bushing balancer with a center of gravity on the same side as the eccentric shaft axis, where the moments generated by centrifugal forces on both balancers counteract each other, reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bushing balancer is designed to balance moments at medium rotation speed, then moment balance is achieved at medium speed, but vibration increases at high rotation speed due to increased centrifugal force on the bushing balancer
Solution Approach 1:
The patent introduces a shaft balancer with a center of gravity positioned on the opposite side of the eccentric shaft axis from the bushing balancer's center of gravity. This counterweight configuration creates opposing centrifugal moments that balance each other at high rotation speeds, counteracting the harmful vibration effect while preserving the moment balance achieved at medium speeds.
2Force
If the bushing balancer swing amount increases at high rotation speed, then centrifugal force balance improves, but the center of gravity shifts causing imbalance and increased vibration
Solution Approach 1:
The patent strategically positions the shaft balancer's center of gravity on the opposite side of the eccentric shaft axis compared to the bushing balancer's center of gravity position. This parameter change in center of gravity location creates a compensating effect where the shaft balancer's centrifugal force changes in opposition to the bushing balancer's centrifugal force, maintaining overall balance despite changes in swing amount at different rotation speeds.
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 balances the moments generated by centrifugal forces, reducing vibration and improving stability across varying rotation speeds.
Implementation Method 1
the moments generated by centrifugal forces acting on the shaft balancer and the bushing balancer, respectively
Data Source
AI summary
A scroll compressor includes a rotary shaft, an eccentric shaft that is eccentric with respect to an axis of the rotary shaft, a bushing that receives the eccentric shaft, and a shaft balancer that rotates integrally with the rotary shaft. The bushing includes a bushing balancer. The shaft balancer includes a first section and a second section. When viewed in the axial direction of the rotary shaft, the first section is located on the same side of a second straight line as the center of gravity of the bushing balancer. The second straight line contains the center of gravity of the shaft balancer and the axis of the rotary shaft. The second section is located on an opposite side of the second straight line from the center of gravity of the bushing balancer. The stiffness of the first section is lower than the stiffness of the second section.