Scroll Compressor Crankshaft Weight Reduces Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional scroll compressors experience increased distortion and bearing abrasion due to high fluid pressure, leading to reduced bearing strength.
Innovation Solution
The implementation of weights on the crankshaft and rotor, including fluid-induced distortion reducing weights and balancing weights, to counteract the centrifugal forces and fluid loads, thereby reducing distortion and abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fluid pressure in the compression chamber is increased to improve compression performance, then compression efficiency is improved, but distortion of the crankshaft increases and bearing strength deteriorates
Solution Approach 1:
A weight is provided on the crankshaft or rotor that generates centrifugal force during rotation to counteract the fluid load applied to the eccentric portion. This centrifugal force acts as a counterbalance to reduce distortion of the crankshaft caused by high fluid pressure, thereby preventing excessive contact pressure on the bearings and reducing bearing abrasion while maintaining high compression efficiency
2Productivity
If fluid pressure in the compression chamber is increased to improve compression performance, then compression efficiency is improved, but distortion of the crankshaft increases leading to increased bearing abrasion
Solution Approach 1:
The weight on the crankshaft or rotor generates centrifugal force during rotation that counteracts the fluid load on the eccentric portion, reducing crankshaft distortion and preventing uneven contact with bearings, thereby reducing bearing abrasion and improving bearing durability while maintaining high compression efficiency
Solution Approach 2:
The weight is configured to generate centrifugal force that preemptively counteracts the fluid load before it causes excessive crankshaft distortion and bearing damage, preventing the harmful effect of increased bearing abrasion that would normally occur at high fluid pressures
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 solution effectively reduces distortion and abrasion of the crankshaft and bearings, maintaining bearing strength even at high fluid pressures, while also simplifying the design and reducing the overall weight and size of the compressor.
Implementation Method 1
At least one of the main shaft (41) of the crankshaft (40) and the rotor (52) of the drive motor (50) is provided with a weight (80) which reduces distortion of the crankshaft (40) caused by a fluid load generated in the compression chamber (30) and applied to the eccentric portion (42) during rotation
Data Source
AI summary
A scroll compressor includes a compression mechanism, a crankshaft, upper and lower bearings, and a drive motor. The compression mechanism includes fixed and movable scrolls engaged with each other to form a compression chamber. The crankshaft has a main shaft and an eccentric portion eccentrically disposed at one end of the main shaft and coupled to a back side of the movable scroll. The upper and lower bearings support upper and lower portions of the main shaft. The drive motor has a stator and a rotor coupled to the main shaft to rotate the movable scroll. At least one of the main shaft and the rotor is provided with a weight arranged to reduce distortion of the crankshaft caused by a fluid load generated in the compression chamber and applied to the eccentric portion during rotation.