Screw Compressor Discharge Passage Noise Reduction
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Solution Overview
Problem
Screw compressors experience increased noise due to fluid pulsation in the discharge passage, which becomes more pronounced with larger and faster compression mechanisms.
Innovation Solution
The discharge passage is redesigned with an inner peripheral passage along the outer peripheral surface of the cylinder and an outer peripheral passage surrounding it, where the fluid flows sequentially through both, with the outer passage being downstream and having a communication passage for fluid direction reversal, reducing pulsation noise by isolating sound transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge passage is formed along the outer peripheral surface of the cylinder to extend in the axial direction, then the cylinder can be heated by the compressed fluid to prevent screw rotor seizing, but noise increases due to fluid pulsation being transferred to the outside via the casing
Solution Approach 1:
The discharge passage is divided into two separate passages: an inner peripheral passage for heating the cylinder and an outer peripheral passage for guiding fluid to the discharge space. This segmentation allows the heating function and discharge function to be separated, reducing noise transmission to the casing while maintaining effective cylinder heating.
Solution Approach 2:
The inner peripheral passage acts as an intermediary between the compression mechanism and the outer peripheral passage. It receives compressed fluid directly from the compression mechanism, heats the cylinder, and then transfers fluid to the outer peripheral passage, which finally guides it to the discharge space. This intermediary structure isolates the noise-generating pulsation from direct contact with the casing.
2Productivity
If the compression mechanism is increased in size and speed to improve productivity, then more fluid can be compressed, but noise from fluid pulsation becomes more remarkable
Solution Approach 1:
By segmenting the discharge passage into inner and outer passages, the system can handle higher compression outputs without proportionally increasing noise. The inner passage manages the high-volume compressed fluid from larger, faster compression mechanisms while directing it away from the casing, preventing noise amplification that would otherwise occur with increased productivity.
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 reduces noise from fluid pulsation by minimizing sound transfer to the outside and efficiently heats the cylinder, preventing screw rotor seizing through thermal expansion differences.
Implementation Method 1
the fluid of a high temperature discharged from the compression mechanism heats the cylinder
Implementation Method 2
owing to the difference in thermal expansion property between the screw rotor and the cylinder, contact between an inner peripheral surface of the cylinder and the rotating screw rotor can be prevented
Data Source
AI summary
A screw compressor includes a casing having an outer peripheral wall, and a compression mechanism. The compression mechanism includes a screw rotor with helical grooves, a gate rotor with a plurality of gates meshing with the helical grooves, and a cylinder housing the screw rotor. The compression mechanism is disposed inward of the outer peripheral wall. The outer peripheral wall has a discharge passage through which a fluid compressed in the compression mechanism flows. The discharge passage includes an inner peripheral passage formed along an outer peripheral surface of the cylinder, and an outer peripheral passage formed along the inner peripheral passage and the outer peripheral wall. The inner and outer peripheral passages are formed so that the fluid compressed in the compression mechanism sequentially flows through the inner and outer peripheral passages.