Direct-Drive Multi-Stage Compressor Without Gear Trains
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Solution Overview
Problem
Industrial compressor systems with multiple compressors and gear boxes are inefficient and costly due to increased complexity and component count, necessitating a more compact and efficient solution.
Innovation Solution
A multi-stage compressor system driven by a single high-speed direct drive electric motor, utilizing split impellers and active magnetic bearings to optimize efficiency and eliminate gear trains, with a single frequency converter for motor control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple compressors are used to achieve higher compression capacity, then productivity increases, but device complexity increases due to multiple motive sources and gear boxes
Solution Approach 1:
The patent combines multiple compressor stages (first stage compressor and second stage compressor) onto a single common drive shaft, eliminating the need for multiple separate motive sources and gear boxes. This merging approach maintains high compression capacity while significantly reducing system complexity by integrating all compression stages into one unified drivetrain system.
2Power
If gear boxes are used to deliver rotational torque to multiple compressor stages, then power transmission is achieved, but loss of energy increases due to friction and mechanical inefficiency
Solution Approach 1:
The patent replaces traditional gear box mechanisms with a direct-drive configuration where the electric motor couples directly to the common drive shaft. This substitution eliminates gear teeth engagement, bearings, and other mechanical transmission components that generate frictional losses, thereby significantly reducing energy loss while maintaining effective torque transmission to all compressor stages.
Solution Approach 2:
The patent extracts and removes the gear box from the system entirely, using the electric motor's native high-speed rotation to directly drive the compressor stages. By taking out the intermediate mechanical transmission system, the patent eliminates the source of frictional energy losses while still achieving the required power delivery to multiple compression stages.
3Reliability
If traditional motor-compressor configurations are used, then reliability is maintained, but device complexity increases due to multiple independent drive systems
Solution Approach 1:
The patent merges multiple compressor stages onto a single common drive shaft that is directly coupled to one electric motor, reducing the number of independent drive systems. This consolidation maintains reliability by ensuring synchronized operation of all compression stages while reducing the total component count and potential failure points associated with multiple separate motors and gear boxes.
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 system achieves increased efficiency and reduced costs by optimizing compressor stage operation and minimizing frictional losses, while maintaining peak efficiency across varying fluid dynamic properties.
Implementation Method 1
a single high speed electric motor directly coupled to the multiple stages of compressors
Implementation Method 2
at least one active magnetic bearing coupled to the output shaft
Data Source
AI summary
A compressor system includes an electric motor having a rotatable output shaft extending from either end thereof. The compressor system further includes multiple compression stages fluidly coupled to one another in series and mechanically connected to the output shaft. The first compressor stage includes two split impellers with each impeller discharging approximately one half of the fluid flow at a desired pressure to the second compressor stage.