Sealed Compressor Bearing Structure to Prevent Main Shaft Wear
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Solution Overview
Problem
Conventional sealed compressors experience wear due to solid contact between the bearing and main shaft when the stator is fixed, leading to reduced durability.
Innovation Solution
Incorporating a non-sliding portion between the main shaft and bearing, which is formed by narrowing the outer diameter of the main shaft, prevents solid contact and deformation-related wear, enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stator is fixed to the bearing by press-fitting, then the stator can be securely mounted, but the inner peripheral surface of the bearing deforms and causes solid contact wear between the bearing and main shaft
Solution Approach 1:
The main shaft is segmented into a sliding portion and a non-sliding portion. The non-sliding portion is positioned where the stator contacts the bearing, creating a clear separation between the sliding interface (for rotation) and the non-sliding interface (for stator mounting). This segmentation prevents the deformation from stator fixation from affecting the sliding surface, thereby eliminating solid contact wear while maintaining secure stator mounting.
Solution Approach 2:
Different portions of the main shaft are given different functional qualities: the sliding portion maintains a smooth, precise surface for low-friction rotation against the bearing, while the non-sliding portion is designed to accommodate stator fixation without requiring sliding performance. This local differentiation ensures that the bearing's inner peripheral surface deformation does not compromise the sliding interface quality.
2Reliability
If the main shaft outer diameter is reduced to minimize contact area, then wear is reduced, but the structural strength of the main shaft may be compromised
Solution Approach 1:
The main shaft is divided into functional segments: a sliding portion with optimized diameter for minimal wear contact, and a non-sliding portion where the diameter is reduced to create clearance from the bearing's inner peripheral surface. This segmentation allows the sliding portion to maintain sufficient structural strength while the non-sliding portion prevents wear by eliminating solid contact at the stator fixation location.
Solution Approach 2:
The non-sliding portion acts as an intermediary element between the sliding portion and the bearing's inner peripheral surface. By creating this intermediate zone with reduced diameter, the design prevents direct contact between the main shaft and the deformed bearing surface, thereby protecting the sliding interface from wear while maintaining overall structural integrity.
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 non-sliding portion effectively avoids wear by maintaining a gap between the bearing and main shaft during stator fixation, significantly enhancing the durability of the sealed compressor.
Implementation Method 1
prevents the occurrence of wear by avoiding solid contact generated between a bearing and a main shaft
Data Source
AI summary
In a sealed compressor, electrically-operated element (104) and compressive element (106) driven by electrically-operated element (104) are housed in the inside of sealed container (102). Compressive element (106) includes shaft (126) formed of main shaft (136) and eccentric shaft (134), and cylinder block (128) having; bearing (144) which pivotally supports main shaft (136) of shaft (126); and cylinder (142). Further, the compressive element (106) includes piston (130) which is movable in the cylinder (142) in a reciprocating manner, and connecting portion (132) which connects eccentric shaft (134) and piston (130) to each other. Electrically-operated element (104) is formed of an outer-rotor-type motor which includes stator (150), and rotor (152) which is disposed coaxially with stator (150) so as to surround an outer periphery of stator (150). Further, non-sliding portion (146) is provided between main shaft (136) and bearing (144), and stator (150) is fixed to outer peripheral portion (162) of bearing (144) which corresponds to non-sliding portion (146).