Crankshaft Counterweight Alignment for Scroll Compressor Vibration
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Solution Overview
Problem
Conventional scroll compressors face inefficiencies in compressing refrigerant due to unbalanced weight distribution and vibration caused by eccentric drive mechanisms, leading to reduced performance and increased noise.
Innovation Solution
The implementation of a counterweight system with a locating feature on the drive shaft, aligned in specific planes, to balance the weight imbalance caused by the eccentric drive, thereby reducing vibration and noise, and enhancing the overall efficiency of the scroll compressor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an eccentric drive mechanism is used to drive the second scroll body in an orbital path, then the scroll compressor can compress refrigerant effectively, but weight imbalance and vibration occur
Solution Approach 1:
The patent applies the counterweight principle by providing a counterweight member (130) that is offset from the drive shaft axis (54) to compensate for the weight imbalance caused by the eccentric drive mechanism. The counterweight member has a specific mass and radial position that creates opposing centrifugal forces to balance the rotating assembly, thereby reducing vibration and noise while maintaining the eccentric drive's compression functionality.
2Object-affected harmful factors
If a counterweight is added to balance the drive shaft, then vibration and noise are reduced, but the device complexity increases
Solution Approach 1:
The patent merges the counterweight function with the existing drive shaft assembly by integrating the counterweight member (130) as a component of the drive shaft assembly. The counterweight is positioned on the drive shaft (46) and works in conjunction with the eccentric drive mechanism, combining multiple functions (drive transmission and weight balancing) into a unified assembly rather than adding a separate independent system.
Solution Approach 2:
The counterweight member (130) is designed with specific dimensional characteristics including an offset radial position and appropriate mass to counterbalance the eccentric drive mechanism. The counterweight features a radial dimension (r2) and axial position that are specifically engineered to provide the necessary balancing effect while minimizing additional complexity to the overall device.
3Stability of the object's composition
If the counterweight locating feature is positioned in a specific plane, then proper radial orientation is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by providing a locating feature (204) on the drive shaft that is pre-positioned in a specific plane (first plane or second plane parallel to the first plane) during manufacturing. This pre-positioned locating feature serves as a reference for properly orienting the counterweight member (130) during assembly, ensuring correct radial alignment before the compressor enters operation. The locating feature is designed to be readily manufacturable while establishing precise orientation.
Solution Approach 2:
The locating feature (204) acts as an intermediary element between the drive shaft (46) and the counterweight member (130). It provides a precise geometric reference that mediates the alignment process, allowing the counterweight to be correctly positioned relative to the drive shaft without requiring complex alignment procedures. The locating feature translates the design geometry into a manufacturable feature that ensures proper radial orientation.
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 counterweight system effectively balances the rotating mass, reducing vibration and noise, and improving the operational efficiency of the scroll compressor by maintaining proper radial orientation and stabilizing the drive mechanism.
Implementation Method 1
The counterweight system effectively balances the rotating mass, reducing vibration and noise
Implementation Method 2
The counterweight having a substantially flat surface that abuts the locating feature to align and locate the counterweight relative to the drive surface
Implementation Method 3
the locating feature is aligned in either the first plane or aligned in a second plane parallel to the first plane
Implementation Method 4
The drive shaft has an eccentric drive configured to engage a corresponding drive hub on the second scroll body
Implementation Method 5
The eccentric drive has a drive surface acting on the corresponding drive hub in a first plane
Data Source
AI summary
A scroll compressor includes a housing, and scroll compressor bodies disposed in the housing. The scroll bodies include a first and second scroll bodies. The first and second scroll bodies have respective bases and respective scroll ribs that project from the respective bases, wherein the scroll ribs mutually engage. The second scroll body is movable relative to the first scroll body for compressing fluid. A drive unit rotates a drive shaft to drive the second scroll body in an orbital path. The drive shaft has an eccentric drive configured to engage a corresponding drive hub on the second scroll body. The eccentric drive has a drive surface acting on the corresponding drive hub in a first plane. The drive shaft has a locating feature for a counterweight. The locating feature is aligned in either the first plane or a second plane parallel to the first plane.