Co-rotating Scroll Compressor Stator Offset for Axis Stability
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Solution Overview
Problem
The compressive load acting in the radial direction of the driving axis destabilizes the behavior of the rotor and scrolls in co-rotating scroll compressors, leading to axis shift and instability.
Innovation Solution
The co-rotating scroll compressor design stabilizes the behavior of the driving and driven scrolls by aligning the driving axis with a fixed axis defined by the stator, which is slightly shifted during operation to counteract the compressive load, using interference fitting to fix the stator to the housing, and positioning the inverter circuit on a thick portion to prevent axis shift and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor uses a co-rotating scroll design with radial compressive load, then compression efficiency is improved, but the rotor and scroll behavior becomes unstable due to axis shift
Solution Approach 1:
The patent applies the counterweight principle by intentionally offsetting the stator fixed axis from the rotor driving axis. The stator is fixed to the housing with its axis positioned at a predetermined offset distance, creating a counterbalancing effect that opposes the compressive load-induced axis shift. This predetermined offset compensates for the destabilizing force, maintaining stable rotor and scroll behavior during compression operations.
Solution Approach 2:
The patent implements preliminary anti-action by pre-positioning the stator fixed axis at an offset location before operation begins. This predetermined axis offset anticipates and counteracts the axis shift that would occur under compressive load, preventing instability before it occurs. The stator is fixed in this predetermined position relative to the housing, establishing a preemptive counterbalance to the radial compressive forces.
2Stability of the object's composition
If the stator is fixed to the housing, then the compressor structure is stabilized, but axis shift occurs under compressive load causing vibration
Solution Approach 1:
The stator is fixed to the housing with its axis offset from the rotor driving axis by a predetermined distance. This offset creates a counterbalancing geometric relationship that opposes the compressive load direction. The fixed stator structure, combined with the predetermined axis offset, acts as a structural counterweight that prevents axis shift and reduces vibration during operation.
Solution Approach 2:
The patent introduces asymmetry by deliberately positioning the stator fixed axis at an offset distance from the rotor driving axis, rather than aligning them concentrically. This asymmetric configuration creates a predetermined geometric relationship that counteracts the symmetric radial compressive load, preventing axis shift and vibration while maintaining structural stability.
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 stabilizes the behavior of the scrolls by minimizing axis shift and reducing vibrations, allowing for a compact compressor configuration with integrated components and simplified wiring.
Implementation Method 1
the stator is fixed to the housing by interference fitting
Data Source
AI summary
If, in a virtual plane orthogonal to a drive axis (X1), a midpoint (MP) between the center of a drive-side base circle (34) and the center of a driven-side base circle (44) is defined as a working point of compression loading generated in the radial direction of the drive axis (X1), a direction orthogonal to a virtual line (VL) connecting two contact points, constituted of a first contact point (P1) and a second contact point (P2), at which a side surface of a driving spiral (33) and a side surface of a driven spiral (43) contact at an outermost circumferential side is defined as the loading direction (LD) of the compression loading, and the range over which the loading direction (LD) fluctuates during one revolution of a drive scroll (30) is defined as a fluctuation range (FR), a stator (13) defines a fixed axis (FX) inside a housing (60), the drive axis is defined by a rotor (14) and is set so as to separate from the fixed axis (FX) in the loading direction (LD) included in the fluctuation range (FR) when not actuated, and so as to match or approach the fixed axis (FX) when actuated.