Multi-Bearing Scroll Compressor Geometry for Second-Bearing Protection
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Solution Overview
Problem
Conventional scroll compressors are prone to damage of the second bearing, leading to operational stoppages, and increasing the cost, size, and weight of the compressor due to the need for higher load capacity bearings.
Innovation Solution
The scroll compressor design optimizes the positioning of bearings by adjusting the distances between the motor center, bearing centers, and the rotor center to distribute loads more evenly, allowing for a second bearing with the same load capacity as the first and third bearings, thereby reducing the risk of damage and minimizing overall size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second bearing is configured with higher load capacity to prevent damage, then reliability is improved, but cost, size, and weight increase
Solution Approach 1:
The patent changes the geometric parameters of the bearing arrangement, specifically the axial positions of the first and third bearings relative to the motor center and orbiting scroll. By optimizing the distance ratios (first bearing to motor center vs. third bearing to orbiting scroll), the load distribution changes, allowing the second bearing to operate within acceptable load limits using standard capacity bearings rather than oversized high-capacity bearings.
2Reliability
If the second bearing is configured with higher load capacity to prevent damage, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent simplifies the bearing configuration by using three bearings of equal or similar load capacity rather than requiring one oversized bearing. This standardization reduces complexity in bearing selection, procurement, and replacement procedures while maintaining reliability through optimized load distribution achieved by parameter changes in bearing positioning.
3Reliability
If the second bearing is configured with higher load capacity to prevent damage, then reliability is improved, but cost increases
Solution Approach 1:
The patent reduces manufacturing cost by changing the bearing arrangement parameters to allow use of standard-capacity bearings instead of expensive high-capacity bearings. The optimized positioning of bearings redistributes loads evenly across all three bearings, eliminating the need for costly oversized bearings while maintaining system reliability.
4Reliability
If the second bearing is configured with higher load capacity to prevent damage, then reliability is improved, but size increases
Solution Approach 1:
The patent optimizes the axial positioning parameters of the bearings to achieve balanced load distribution. This allows the use of compact standard-capacity bearings instead of larger high-capacity bearings, reducing the overall volume of the compressor while maintaining reliability through the optimized geometric arrangement.
Data Source
AI summary
A scroll compressor including a first bearing rotatably supporting a rotary shaft relative to a casing at one side of the rotary shaft with respect to a motor, a second bearing rotatably supporting the rotary shaft relative to the casing at the other side of the rotary shaft with respect to the motor, and a third bearing rotatably supporting the rotary shaft relative to an orbiting scroll at the opposite side of the first bearing with respect to the second bearing. The distance between a first bearing center and a third bearing center is a predetermined distance, the distance between a motor center and the third bearing center is longer than the distance between the motor center and the first bearing center, and the distance between a second bearing center and the motor center is longer than the distance between the second bearing center and the third bearing center.