Hermetic Compressor Bearing Frame Layout for Shaft Wobble Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional hermetic compressors face challenges in achieving balanced rotation due to eccentric loads, leading to vibration and noise, and existing designs fail to adequately address the deformation of the bearing frame portion under gas loads, which compromises operational reliability.
Innovation Solution
A hermetic compressor design featuring a bearing frame portion with high and low rigidity areas, arranged to align with the direction of maximum load, and leg portions extending radially from the bearing portion, located within specific angular ranges to effectively manage and suppress wobbling of the rotating shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing frame portion is made with uniform rigidity, then the structure is simple, but the bearing frame deforms under gas load, reducing operational reliability
Solution Approach 1:
The bearing frame portion is designed with non-uniform rigidity distribution, featuring a high rigidity portion and a low rigidity portion. The high rigidity portion is positioned to coincide with the direction of maximum gas load, preventing deformation under load and ensuring operational reliability, while the low rigidity portion reduces overall structural complexity
2Reliability
If the sub-bearing is fixed without considering angular position of refrigerant passages, then the fixing is simple, but the bearing frame deforms under gas load, causing insufficient suppression of shaft wobble
Solution Approach 1:
The bearing frame portion is designed with non-uniform rigidity distribution, featuring a high rigidity portion and a low rigidity portion. The high rigidity portion is positioned to coincide with the direction of maximum gas load, preventing deformation under load and ensuring operational reliability, while the low rigidity portion reduces overall structural complexity
3Object-generated harmful factors
If the hermetic compressor uses conventional balancing methods, then the manufacturing is simple, but the rotation is not fully balanced, causing vibration and noise
Solution Approach 1:
An eccentric portion is provided on the rotating shaft to serve as a counterweight for balancing. This counterweight compensates for the unbalanced eccentric load during rotation, reducing vibration and noise without complicating the manufacturing process
Data Source
AI summary
A closed compressor provided for achieving a wobbling suppressing effect of a rotating shaft by a bearing frame portion and improving a reliability thereof by preventing a bearing frame portion from being deformed due to a gas load includes a bearing member provided between the one end in the axial direction of the closed container and the electric motor and includes a bearing portion pivotally supporting the rotating shaft and a bearing frame portion holding the bearing portion, and the bearing frame portion includes a high rigidity portion and a low rigidity portion in a circumferential direction and the bearing frame portion is arranged in the closed container such that a direction in which a load acting on the bearing portion becomes maximum coincides with a direction in which rigidity of the bearing frame portion is high.