Screw Compressor Recessed Casing for Over-Compression Control
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Solution Overview
Problem
Screw compressors face issues with increased power consumption, vibration, and noise due to rapid pressure rise and liquid over-compression when the working chamber volume approaches zero, leading to potential rotor damage and reduced operation life.
Innovation Solution
A screw compressor design with a recessed part on the casing wall surface opposing the rotor delivery end, maintaining communication between the working chamber and the recessed part until the volume becomes zero, matches the recessed part's contour with the leading flank of the rotor, and sets the delivery port at a progressed position to prevent over-compression and maintain stable oil delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working chamber is isolated from the delivery port before the volume becomes zero, then the compression process is completed, but the pressure rises rapidly causing vibration, noise, and potential rotor damage
Solution Approach 1:
The recessed part is prepared in advance on the casing wall surface, creating a pressure relief path before the working chamber volume becomes zero. This preliminary structural arrangement prevents rapid pressure rise by providing an escape route for compressed gas, thereby avoiding vibration, noise, and rotor damage while maintaining compression efficiency.
Solution Approach 2:
The recessed part acts as an intermediary chamber between the working chamber and the external environment. It mediates the pressure transition by providing a buffer zone where compressed gas can be gradually released, preventing sudden pressure spikes that would cause harmful vibrations and noise.
2Productivity
If liquid is poured into the working chamber for cooling and sealing, then the gas compression is improved, but the liquid may be over-compressed when volume approaches zero, reducing operation life
Solution Approach 1:
The recessed part provides an extraction path for liquid and gas mixture from the working chamber before the volume becomes zero. By creating this alternative exit route, the system prevents over-compression of liquid, which would otherwise occur when the working chamber is completely isolated, thereby extending operation life while maintaining compression efficiency.
3Productivity
If the delivery port is positioned to complete isolation before zero volume, then the compression cycle is finalized, but intermittent torque increase occurs due to liquid over-compression
Solution Approach 1:
The recessed part is structurally prepared in advance to receive and vent the compressed gas-liquid mixture before the working chamber volume becomes zero. This preliminary arrangement prevents the formation of over-compressed liquid pockets that would cause intermittent torque spikes and increased power consumption, while still allowing complete compression cycle operation.
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 reduces intermittent torque increase, saving energy and minimizing vibration and noise, while preventing over-compression and extending the operation life of the compressor.
Implementation Method 1
Liquid is poured to the working chamber 8 for cooling the gas in the compression process
Data Source
AI summary
A screw compressor rotatably accommodates, within a casing including a suction port and a delivery port, a pair of female and male rotors under the meshed state and compresses gas in the state where a liquid is mixed by pouring the liquid to the gas confined within a working chamber formed with both rotors and the casing. On the wall surface of the casing opposing to the rotor delivery end, a recessed part is provided. The working chamber is communicated with the recessed part immediately before isolating from the delivery port and this communication is maintained until a volume of the working chamber substantially becomes zero. Thereby, the screw compressor can be control increase in power consumption, vibration, and noise.