Piston compressor and refrigeration system having the same
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Solution Overview
Problem
High efficiency compressors with rolling thrust bearings experience inadequate lubrication, leading to increased friction and power consumption due to insufficient heat dissipation from friction between balls and supporting plates.
Innovation Solution
A piston compressor design featuring a crankcase with a crankshaft hole and mounting protrusion, where the crankshaft has an oil supply passage that continuously lubricates the thrust bearing, reducing friction and heat transmission by distributing lubricating oil effectively between the balls and supporting plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If splash lubrication is used for the thrust bearing, then the device complexity is reduced, but the lubrication effectiveness deteriorates leading to increased friction and power consumption
Solution Approach 1:
The patent implements continuous lubrication by forming an oil supply passage through the crankshaft that continuously supplies lubricating oil to the thrust bearing. This ensures the lubrication action is continuous rather than intermittent splash lubrication, thereby reducing friction and power consumption while maintaining reasonable system complexity
Solution Approach 2:
The patent uses hydraulic lubrication by introducing lubricating oil through the oil supply passage to the thrust bearing. This hydraulic lubrication system replaces splash lubrication, providing adequate and continuous lubrication to reduce friction between the balls and supporting plates, thus lowering power consumption
2Device complexity
If splash lubrication is used for the thrust bearing, then the structure is simpler, but the heat dissipation capability deteriorates resulting in increased friction coefficient
Solution Approach 1:
The continuous supply of lubricating oil through the oil supply passage ensures continuous cooling of the thrust bearing balls. This continuous thermal action removes heat effectively from the friction surfaces, preventing temperature buildup and maintaining low friction coefficient
Solution Approach 2:
The lubricating oil acts as an intermediary substance that performs dual functions: lubrication and heat dissipation. The oil absorbs heat from the balls through conduction and convection, effectively removing thermal energy from the thrust bearing assembly while reducing direct metal-to-metal contact
3Duration of action of moving object
If continuous lubrication is implemented through oil supply passage, then the service life is extended, but the device complexity increases
Solution Approach 1:
The patent merges the lubrication function into the crankshaft structure by forming an oil supply passage directly within the crankshaft. This integration combines the crankshaft's rotational function with the lubrication delivery function, extending service life through continuous lubrication while minimizing additional structural complexity
Solution Approach 2:
The crankshaft is designed with multi-functionality, serving both as the rotating component that converts reciprocating motion and as the lubrication delivery system through its internal oil supply passage. This universal design provides continuous lubrication to extend service life without requiring a separate complex lubrication system
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 performance and service life of the piston compressor by continuously lubricating the thrust bearing, reducing friction and heat transfer, thereby improving efficiency and extending the compressor's lifespan.
Implementation Method 1
the oil supply passage within the crankshaft may continuously supply the lubricating oil to the thrust bearing, the lubricating oil thereby may continuously lubricate balls, thus lowering the friction work between the balls and an upper supporting plate and between the balls and a lower supporting plate
Implementation Method 2
the lubricating oil may continuously take away the heat of the balls, thus further lowering the heat transmitted from the balls to a cage
Implementation Method 3
the lubricating oil may continuously take away the heat of the balls
Data Source
AI summary
A compressor and a refrigeration system having the same are provided. The compressor includes a crankcase, a thrust bearing and a crankshaft. The crankcase is formed with a crankshaft hole therein and provided with a mounting protrusion at an upper end thereof. The crankshaft hole runs upward through the mounting protrusion. The thrust bearing is fitted over the mounting protrusion. The crankshaft is rotatably disposed within the crankshaft hole, has a thrust part, and is formed with an oil supply passage therein. A lower end face of the thrust part is abutted against an upper end face of the thrust bearing. A cavity is defined by the mounting protrusion, the thrust bearing and the thrust part. A through hole is formed in a peripheral wall of the crankshaft for communicating the oil supply passage with the cavity.