Screw Compressor Fluid Supply Positioning for Atomization
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Solution Overview
Problem
In screw compressors, the water sprayed from inclined small holes into the compression chamber often fails to atomize sufficiently due to the presence of a rotating screw rotor, leading to a risk of water adhering to the rotor surface when the distance is short or the rotor speed is high.
Innovation Solution
The fluid supply portion is positioned between the compression intersection line and the trajectory line formed by the intersection of the male and female rotor lobes, and uses a jet impingement nozzle with inclined fluid injection holes to ensure effective atomization of the fluid within a shorter distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If water is sprayed from inclined small holes in the water supply portion, then water spreads over a wide range in the compression working chamber, but water requires a certain distance to be atomized through a water membrane state
Solution Approach 1:
The water supply portion is divided into multiple small holes (e.g., 3-5 holes per water supply portion) arranged in a specific pattern. Each small hole sprays water in a different direction, and the combined effect creates a wide spray coverage while each individual jet has sufficient space to atomize. This segmentation allows the system to achieve both wide coverage and adequate atomization distance simultaneously.
2Productivity
If the distance between the lobe bottom of the screw rotor and the water supply portion is short, or the rotation speed of the screw rotor is high, then productivity is improved, but water adheres to the surface of the screw rotor without being sufficiently atomized
Solution Approach 1:
The small holes are positioned and oriented to create localized spray patterns that ensure complete atomization before the water reaches the rotor surface. By controlling the spray direction and distribution at each local point, the system achieves reliable atomization even when the overall distance to the rotor is short or rotor speed is high.
3Temperature
If multiple water supply portions are provided to spray water over a wide range, then cooling efficiency is improved, but the distance for water atomization is limited due to the rotating screw rotor
Solution Approach 1:
The small holes within each water supply portion are arranged asymmetrically with different orientations (e.g., some holes inclined at +15 degrees, others at -15 degrees relative to the horizontal). This asymmetric arrangement creates a dispersed spray pattern that covers a wide area while each individual jet maintains sufficient distance for atomization, solving the contradiction between wide coverage and adequate atomization distance.
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 ensures that the fluid is sufficiently atomized in a shorter distance, enhancing cooling efficiency, reducing particle size for improved heat transfer, and minimizing internal leaks, thereby saving energy and preventing fluid adherence to the rotor.
Implementation Method 1
uses a jet impingement nozzle with inclined fluid injection holes to ensure effective atomization of the fluid within a shorter distance
Implementation Method 2
The fluid supply portion supplies fluid in a membrane form into a compression chamber... sufficiently atomized in a shorter distance
Data Source
AI summary
A screw compressor includes a screw rotor, a casing, and a fluid supply portion to supply fluid in a membrane form into a compression chamber in the casing. The screw rotor has a male and female rotors. A male bore covering the male rotor and a female bore covering the female rotor are formed on the inner surface of the casing. An intersection line, on a higher pressure side, of the male and female bores is defined as a compression cusp. In a bore development view, a trajectory made by the first intersection of an extension line of a female lobe ridge and a male lobe ridge being moved, along with the rotation of the male and female rotors, is defined as a trajectory line. An opening of the fluid supply section to the compression chamber is positioned between the compression cusp and the trajectory line.