Hermetic compressor and refrigeration device
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Solution Overview
Problem
Conventional hermetic compressors face challenges in maintaining bearing strength and mechanical strength due to reduced shaft diameters and increased eccentricity, leading to mechanical losses and reduced oil supply capacity, which affects efficiency and reliability.
Innovation Solution
The design incorporates independent oil supply passages for the main shaft and eccentric shaft, allowing for optimal placement and thickness of the flange, ensuring bearing strength and mechanical strength without increasing the compressor's height, and utilizing a communicating oil supply passage system that maximizes centrifugal force for efficient lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If shaft diameters are reduced to increase eccentricity, then mechanical losses are reduced, but bearing strength decreases
Solution Approach 1:
The oil supply mechanism is segmented into multiple independent passages: a first oil supply passage for the main shaft and a second oil supply passage for the eccentric shaft. This segmentation allows each passage to be optimized independently, enabling reduced shaft diameters for lower mechanical losses while maintaining adequate lubrication and bearing strength through dedicated oil supply paths.
2Loss of energy
If shaft diameters are reduced to increase eccentricity, then mechanical losses are reduced, but oil supply capacity decreases
Solution Approach 1:
The oil supply system is divided into separate passages for the main shaft and eccentric shaft, allowing each to receive adequate lubrication independently. This ensures sufficient oil supply capacity to both components even when shaft diameters are reduced, as each passage can be optimized for its specific lubrication requirements without compromising the other.
Solution Approach 2:
The oil supply passages are positioned at different angular locations around the shafts (different dimensional orientations). The first passage supplies the main shaft at one angular position while the second passage supplies the eccentric shaft at another angular position, maximizing oil supply capacity in multiple dimensional directions simultaneously.
3Strength
If flange thickness is increased to ensure mechanical strength, then crankshaft strength is improved, but compressor height increases
Solution Approach 1:
The oil supply mechanism is segmented into multiple independent passages within the flange structure, allowing efficient lubrication delivery without requiring excessive flange thickness. This enables maintenance of crankshaft mechanical strength through optimized passage configuration rather than simply increasing overall flange dimensions, thereby controlling compressor height.
4Quantity of substance
If oil supply passage openings are positioned in bearing load regions, then oil supply is effective, but bearing strength decreases
Solution Approach 1:
The oil supply passages are positioned with specific local quality considerations: the first passage supplies the main shaft at angular positions optimized for main shaft lubrication, while the second passage supplies the eccentric shaft at different angular positions optimized for eccentric shaft lubrication. This localized optimization ensures effective oil supply to each component without compromising bearing strength, as each passage is strategically positioned to avoid critical bearing load regions while maintaining lubrication effectiveness.
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
This design enhances the compressor's efficiency and reliability by ensuring bearing strength, reducing mechanical losses, and allowing for a more compact and efficient refrigeration device with improved oil supply capacity.
Implementation Method 1
Through the rotation of crankshaft 909, lubricating oil 902 passes along spiral groove 916a to be supplied to the upper part of main shaft 913
Data Source
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AI summary
A hermetic compressor accommodates in hermetic container (101) electric motor element (102) and compression element (103) driven by electric motor element (102). Compression element (103) includes crankshaft (110) including main shaft (115), eccentric shaft (114), and flange (116), cylinder block (111) having cylinder bore (123) passing through cylinder block (111) in a cylindrical shape, and piston (112) configured to reciprocate in cylinder bore (123). Compression element (103) also includes connecting rod (113) connecting piston (112) and eccentric shaft (114) and bearing (124) formed on cylinder block (111) for pivotally supporting a radial load that acts on main shaft (115) of crankshaft (110). Crankshaft (110) further includes communicating oil supply passage (118) provided in flange (116), main shaft oil supply passage (119) configured for communication between communicating oil supply passage (118) and cylindrical surface (115a) of main shaft (115), and eccentric shaft oil supply passage (120) configured for communication between communicating oil supply passage (118) and cylindrical surface (114a) of eccentric shaft (114).