Scroll Compressor Counterweight Layout for Bushing Wear Control
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Solution Overview
Problem
Scroll compressors experience dynamic imbalance due to centrifugal forces generated during operation, leading to vibration and noise, and existing counterweight designs can cause wear between the bushing and driving bearing if not properly aligned.
Innovation Solution
A scroll compressor design featuring a counterweight with a mass center positioned above the axial lower end of the driving bearing, where the axial distance from the mass center to the driving bearing's axial center satisfies the ratio 0.1≤R≤0.4, effectively offsetting centrifugal forces while allowing for a degree of bushing inclination to reduce wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a counterweight is arranged on the bushing to balance centrifugal force, then dynamic imbalance is solved, but the bushing may become inclined relative to the driving bearing causing wear
Solution Approach 1:
A counterweight is arranged on the bushing to generate a reverse centrifugal force that balances the centrifugal force generated by the orbiting scroll, solving the dynamic imbalance problem. The counterweight's mass center is positioned at a specific axial distance from the driving bearing to optimize balance while minimizing inclination effects.
Solution Approach 2:
The axial distance L2 from the mass center of the counterweight to the axial center of the driving bearing is controlled within a specific range (0.05≤L2/L1≤0.4). This parameter optimization allows the bushing to have a certain degree of inclination without causing excessive wear, as the smaller L2 value reduces the moment arm that causes inclination while still providing effective counterbalancing.
2Reliability
If the counterweight is positioned to minimize bushing inclination, then wear is reduced, but the counterbalancing effectiveness may be compromised
Solution Approach 1:
The axial distance L2 from the mass center of the counterweight to the axial center of the driving bearing is controlled within a specific range (0.05≤L2/L1≤0.4). This parameter optimization allows the bushing to have a certain degree of inclination without causing excessive wear, as the smaller L2 value reduces the moment arm that causes inclination while still providing effective counterbalancing.
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 balances centrifugal forces, reduces wear between the bushing and driving bearing, and lowers manufacturing and installation accuracy requirements, optimizing the scroll compressor system.
Implementation Method 1
a centrifugal force generated by the orbiting scroll in the movement process causes the problem of dynamic imbalance... providing a reverse centrifugal force to balance the centrifugal force generated by the orbiting scroll
Data Source
AI summary
A scroll compressor includes: a rotary shaft; a compression mechanism including an orbiting scroll and a non-orbiting scroll, an extension portion of the orbiting scroll engaging with an eccentric structure of the rotary shaft via a bushing and a driving bearing having an axial height L1; and a counterweight located on the bushing, a mass center of the counterweight being located above an axial lower end of the driving bearing and having an axial distance L2 to the axial center of the driving bearing, and the ratio R of the axial distance L2 to the axial height L1 satisfying: 0.1≤R≤0.4. The scroll compressor can reduce the contact and wear between the bushing and the driving bearing and reduce the requirements for the manufacturing precision and the mounting precision of components such as the counterweight and the bushing, achieving optimized system design.