Multi-Bearing Scroll Compressor Layout for Second Bearing Load Relief
Find Innovative SolutionsGenerate Solutions
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 to address this issue is not feasible.
Innovation Solution
The scroll compressor design optimizes the positioning and load distribution of bearings by adjusting the distances between the motor center, bearing centers, and the rotor center, allowing for a reduced load on the second bearing while maintaining performance, and potentially using bearings with similar load capacities to the first and third bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second bearing is configured with higher load capacity to prevent damage, then the reliability of the scroll compressor is improved, but the cost, size, and weight of the compressor are increased
Solution Approach 1:
The patent changes the geometric parameters of the bearing arrangement, specifically the axial distance between the motor and the second bearing, to optimize load distribution. By adjusting this distance, the load on the second bearing is reduced to a level that can be handled by standard bearings, eliminating the need for oversized high-capacity bearings while maintaining reliability
Solution Approach 2:
The patent introduces dynamic load balancing through the orbital motion of the scroll, which naturally distributes loads across the bearing system. The orbital movement creates varying load conditions that prevent any single bearing from experiencing constant maximum load, thereby extending bearing life without requiring excessive load capacity
2Reliability
If the second bearing is configured with higher load capacity to prevent damage, then the reliability of the scroll compressor is improved, but the cost of the compressor is increased
Solution Approach 1:
The patent modifies the axial positioning parameter (distance between motor and second bearing) to achieve optimal load distribution. This parameter change allows the use of standard, cost-effective bearings instead of expensive high-capacity bearings, reducing manufacturing costs while maintaining system reliability
3Reliability
If the second bearing is configured with higher load capacity to prevent damage, then the reliability of the scroll compressor is improved, but the size of the compressor is increased
Solution Approach 1:
The patent optimizes the axial distance parameter between the motor and the second bearing to reduce the load on the second bearing. This allows the use of compact, standard-size bearings instead of large high-capacity bearings, thereby reducing the overall compressor volume while maintaining reliability
4Reliability
If the distance between the motor center and the first bearing center is increased, then the load on the second bearing is reduced, but the overall length of the compressor is increased
Solution Approach 1:
The patent employs asymmetric bearing arrangement where the distances between components are deliberately made unequal. The distance from the motor to the first bearing is optimized differently from the distance from the first bearing to the second bearing, creating an asymmetric configuration that reduces second bearing load while minimizing overall length
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.