Dual Nozzle Liquid Supply for Screw Compressor Temperature Control
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Solution Overview
Problem
In liquid supply type screw compressors, reducing liquid supply amounts to minimize power loss for stirring leads to increased liquid temperature, facilitating deterioration.
Innovation Solution
Implementing a dual liquid supply nozzle configuration where one nozzle supplies a smaller amount of liquid on the low-pressure side and a larger amount on the high-pressure side, positioned to minimize the likelihood of liquid being drawn into meshing rotor portions, thereby reducing stirring work and temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If liquid supply amount is reduced to minimize power loss for stirring, then energy efficiency is improved, but liquid temperature rises and deterioration is facilitated
Solution Approach 1:
The liquid supply system is segmented into two separate nozzles: a first liquid supply nozzle that supplies liquid to the male-rotor-side working chamber and a second liquid supply nozzle that supplies liquid to the female-rotor-side working chamber. Each nozzle is independently controlled with different liquid supply amounts, allowing optimized liquid distribution that reduces unnecessary stirring while maintaining adequate cooling, thereby resolving the contradiction between energy efficiency and temperature control
Solution Approach 2:
Different liquid supply amounts are applied to different locations (male-rotor-side and female-rotor-side working chambers) based on their specific operational characteristics. The first nozzle supplies a first liquid supply amount to the male rotor side, while the second nozzle supplies a second liquid supply amount to the female rotor side, enabling localized optimization that reduces overall stirring work while preventing temperature rise in critical areas
2Productivity
If liquid supply amount is reduced to minimize stirring work, then productivity is improved, but liquid lifetime deteriorates due to temperature rise
Solution Approach 1:
The liquid supply system is divided into two independently controlled nozzles that can be optimized for different functions. This segmentation allows the system to minimize total liquid supply for reduced stirring work while ensuring adequate cooling in specific high-temperature zones, thereby maintaining compression efficiency while extending liquid lifetime through targeted temperature control
Solution Approach 2:
The liquid supply parameters (amount and distribution) are changed and optimized for each rotor side separately. By adjusting the liquid supply amounts of the first and second nozzles to different values, the system achieves optimal balance between minimizing stirring work and controlling liquid temperature to prevent deterioration, thus improving both productivity and liquid lifetime
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 effectively suppresses liquid temperature rise while reducing the work for stirring, enhancing energy saving performance and liquid lifetime.
Implementation Method 1
Purposes of the liquid supply are for cooling of the gas at a compression step
Implementation Method 2
lubrication of the rotors
Data Source
AI summary
A liquid-supply-type screw compressor can suppress a rise in temperature of a liquid while reducing work for stirring the liquid. The compressor has male and female rotors, male- and female-rotor-side working chambers formed at grooves of the male and female rotors, respectively. The compressor also has a liquid supply nozzle arranged on one side in the rotor axial direction which is a low-pressure side of an intersection at which a high-pressure-side cusp intersects a ridge line of a trailing lobe tip of the female rotor that defines a female-rotor-side working chamber, the nozzle supplying liquid to the male-rotor-side working chamber; and a liquid-supply nozzle arranged on the other side in the rotor axial direction which is a high-pressure side of the intersection, and supplies the liquid to the male-rotor-side working chamber, and the liquid supply amount of the nozzle is made greater than the amount of the other liquid-supply nozzle.