Screw Compressor Exhaust Channel Noise Reducer for Pressure Pulsation
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Solution Overview
Problem
Screw compressors experience unstable gas flow and pressure pulsations due to discontinuous inter-tooth volumes, leading to vibration and noise, which existing designs fail to adequately address.
Innovation Solution
A screw compressor design incorporating a noise reducer group with partitioned noise reduction chambers in the exhaust channel, featuring front and rear end plates and partition plates that reduce noise by altering cross-sectional areas and sound wave energy through the exhaust channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a screw compressor uses discontinuous inter-tooth volumes formed by meshing rotors, then the compression process is completed, but unstable gas flow and pressure pulsations occur causing vibration and noise
Solution Approach 1:
The exhaust channel is segmented into multiple noise reduction chambers by partition plates, dividing the single exhaust flow path into multiple parallel paths. This segmentation stabilizes the gas flow by distributing the intermittent exhaust from rotor teeth across multiple chambers, reducing pressure pulsations and noise while maintaining compression functionality.
2Object-generated harmful factors
If noise reduction chambers are added to the exhaust channel, then noise is reduced, but the device complexity increases
Solution Approach 1:
The partition plates serving as walls for noise reduction chambers also function as structural support elements and flow distribution components. The exhaust channel housing serves both as a containment structure and as part of the noise reduction chamber assembly. This multi-functionality reduces the need for additional dedicated noise control components, thereby limiting the increase in device complexity.
3Object-generated harmful factors
If the cross-sectional area of noise reducer inlet and outlet is reduced, then noise reduction effectiveness is improved, but pressure loss increases
Solution Approach 1:
Instead of reducing the cross-sectional area of individual inlet/outlet openings, the design extends the noise reduction functionality into the axial dimension by creating multiple chambers in series. The partition plates are arranged axially to form multiple compression chambers, allowing noise reduction to occur along the length of the exhaust channel rather than constraining the flow area, thus maintaining pressure while reducing noise.
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
The design effectively reduces noise and vibration by utilizing noise reduction chambers to absorb sound wave energy, enhancing noise reduction across a wide frequency range without significant pressure loss.
Implementation Method 1
The plurality of noise reduction chambers are arranged side-by-side around the axial direction of the rotor assembly... each noise reduction chamber is provided with a noise reducer inlet and a noise reducer outlet... to eliminate noise in the exhaust channel
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A screw compressor (100), comprising: a housing (101), a rotor assembly (221), an exhaust channel (217), and at least one noise reducer group (240), wherein the noise reducer group (240) is arranged in the exhaust channel (217) to eliminate noise in the exhaust channel (217); the noise reducer group (240) comprises a front end plate (241), a rear end plate (242) and a plurality of partition plates (243); each partition plate (243) divides a space between the front end plate (241) and the rear end plate (242) into a plurality of noise reduction chambers (248); and each noise reduction chamber (248) is provided with a noise reducer inlet (245) and a noise reducer outlet (246), each noise reducer inlet (245) being independently in fluid communication with a rotor outlet (223), and each noise reducer outlet (246) being independently in fluid communication with an exhaust port (106). In the screw compressor, the noise reducer group, which is formed by arranging side-by-side the noise reduction chambers of a plurality of expansion noise reducers, is arranged in the exhaust channel, which not only fully utilizes the space of the exhaust channel, but also increases the upper limit of plane waves, such that the upper limit of an effective noise reduction frequency is higher and thus more noise can be eliminated.