Screw Compressor Noise Reduction via Air-Cooled Heat Exchanger Fairing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Oil-free screw compressors experience high-frequency noise due to high-speed rotor operation and pressure pulsation, which affects efficiency and causes vibration noise that is transmitted through the cooler and connection pipes, leading to increased noise emission.
Innovation Solution
The design incorporates an air-cooled heat exchanger positioned centrally within the compressor unit, with a duct system that includes a louver structure suction duct and an exhaust duct with a cooling fan, strategically placed to reduce noise emission by attenuating sound waves and optimizing airflow, while maintaining compactness and reducing installation area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air-cooled heat exchanger is positioned close to the delivery port of the cooling wind, then the cooling capability is improved, but the vibration noise of the heat exchanger directly leaks to outside of the case
Solution Approach 1:
A heat exchanger noise reduction fairing is introduced as an intermediary component between the heat exchanger and the external environment. The fairing encloses the heat exchanger and includes a noise reduction treatment portion that absorbs or blocks vibration noise, preventing it from directly leaking to the outside while maintaining the heat exchanger's cooling function through the delivery port
2Productivity
If the rotors are driven at high speed (10000 to 20000 rpm) to overcome leakage, then compressor efficiency is improved, but high frequency noise of several thousand hertz is generated
Solution Approach 1:
The noise reduction fairing acts as an intermediary barrier that specifically targets and attenuates the high frequency noise generated by the high-speed rotors, allowing the rotors to maintain their high operating speed for efficiency while the fairing reduces the noise transmission to the external environment
3Area of stationary object
If the heat exchanger is positioned centrally in the unit, then the installation area is reduced and the compressor becomes compact, but the noise reduction capability must be enhanced
Solution Approach 1:
The noise reduction fairing is designed to nest around the centrally positioned heat exchanger, with the fairing forming an enclosing structure that contains the heat exchanger within it. This nested configuration allows the heat exchanger to be positioned centrally for compactness while the surrounding fairing provides noise reduction without increasing the overall installation footprint
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 emission from the air-cooled heat exchanger, allowing for a more compact and efficient compressor operation without compromising cooling capability, thereby improving operational efficiency and worker safety.
Implementation Method 1
an air-cooled heat exchanger for cooling a compressed air discharged from the compressor
Implementation Method 2
a duct which takes in air from an area below the case and discharges it from a ceiling portion
Data Source
AI summary
A screw compressor comprising: a pair of male and female screw rotors; and an air-cooled heat exchanger, wherein the air-cooled heat exchanger is provided above a motor for driving the compressor body; wherein, with respect to a cooling wind for the air-cooled heat exchanger, the air-cooled heat exchanger is inclined to the upstream side; wherein the uppermost portion of a unit suction port for the air-cooled heat exchanger cooling winds is positioned below the uppermost portion of the air-cooled heat exchanger positioned at the uppermost portion; wherein the lowermost portion of the unit suction port for the air-cooled heat exchanger cooling wind is positioned below the lowermost portion of the air-cooled heat exchanger positioned at the lowermost portion; and wherein the cooling wind for the air-cooled heat exchanger is exhausted from a ceiling portion of the compressor unit. With this structure, it becomes possible to provide a compact screw compressor with less noise whose installation area can be reduced.