Concentric Vane Compressor Dual-Stage Design
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Solution Overview
Problem
Conventional vane compressors have limitations in efficiency, noise, and vibration due to single-stage compression and require vane springs for maintaining contact, which can be restrictive and prone to wear.
Innovation Solution
A positive displacement device with two orbiting cylinders, one smaller and one larger, configured concentrically around a fixed cylinder, allowing dual compression cavities with alternating high and low pressure regions, reducing peak torque and noise, and eliminating the need for vane springs by using a common vane that maintains sealing contact with both cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage compression is used in conventional vane compressors, then the device complexity is reduced, but the motor running efficiency deteriorates
Solution Approach 1:
The compression process is segmented into two distinct stages occurring simultaneously in separate cavities. The inner cavity performs first-stage compression while the outer cavity performs second-stage compression, allowing the motor to operate more efficiently through staged compression rather than single-stage compression.
Solution Approach 2:
The inner cylinder with its compression cavity is nested within the outer cylinder assembly. The inner cylinder orbits within the inner cavity, while the outer cylinder orbits within the outer cavity, creating a nested dual-stage compression system that improves motor efficiency without excessive complexity.
2Reliability
If vane springs are used to maintain contact between the vane and orbiting cylinder, then the sealing contact is maintained, but the reliability deteriorates due to wear and the device complexity increases
Solution Approach 1:
The vane spring mechanism is completely removed from the system. Instead of using springs to maintain contact, the patent uses the orbital motion of the cylinders and pressure differential to maintain sealing contact between the vanes and the cylinder surfaces, eliminating wear-prone spring components.
Solution Approach 2:
The system uses its own operational parameters (orbital motion and pressure differential) to maintain vane contact automatically. The pressure difference between compression stages and the orbital movement create natural forces that keep the vanes in sealing contact without external spring mechanisms.
3Device complexity
If a common vane is used for both inner and outer cavities, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
A single common vane serves dual functions by providing sealing contact in both the inner and outer cavities simultaneously. This multi-functional design reduces the number of parts while maintaining reliable sealing through precise orbital positioning and pressure differential management.
4Use of energy by moving object
If dual orbiting cylinders are used to create dual compression cavities, then the motor running efficiency is improved, but the device complexity increases
Solution Approach 1:
Two compression stages are merged into a single integrated device with concentric cylinders. The inner and outer cylinders orbit together, with the inner cylinder positioned within the outer cylinder, combining two compression functions into one compact unit that improves motor efficiency.
Solution Approach 2:
The compression system transitions from a single-dimensional (single cavity) to a two-dimensional (concentric dual cavity) arrangement. By utilizing radial spacing between concentric cylinders, the patent creates additional compression space without significantly increasing the overall footprint, managing complexity through spatial efficiency.
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 configuration enhances motor running efficiency, reduces compressor noise and vibration, and allows for flexible flow control options, including dual-stage compression, while increasing liquid slugging tolerance and reducing wear on components.
Implementation Method 1
The second cylinder and the third cylinder orbit with respect to the first cylinder to create alternating regions of high pressure and low pressure in the inner regions and the outer regions
Data Source
AI summary
A positive displacement device includes a first cylinder, a second cylinder disposed within the first cylinder, and a third cylinder disposed around the first cylinder. An interior surface of the first cylinder and an exterior surface of the second cylinder define an inner cavity. An exterior surface of the first cylinder and an interior surface of the third cylinder define an outer cavity. A partition between the interior surface of the first cylinder and the exterior surface of the second cylinder divides the inner cavity into inner regions, and another partition between the exterior surface of the first cylinder and the interior surface of the third cylinder divides the outer cavity into outer regions. The second cylinder and the third cylinder orbit with respect to the first cylinder to create alternating regions of high pressure and low pressure in the inner regions and the outer regions.