Screw Compressor Muffler Space for Pressure Fluctuation Control
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Solution Overview
Problem
Screw compressors generate noise due to significant pressure fluctuations of the fluid passing through the high-pressure fluid passage, causing vibration in the casing.
Innovation Solution
Incorporating a muffler space in the casing that communicates with the discharge passages to reduce pressure fluctuations, and using an odd number of helical grooves on the screw rotor to shift and cancel pressure waveforms in the discharge passages, thereby reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fluid is discharged sequentially from the fluid chambers through the discharge passages, then the compression function is achieved, but the pressure fluctuation of the fluid causes vibration and noise in the casing
Solution Approach 1:
A muffler space is introduced as an intermediary component between the discharge passages and the high-pressure fluid passage. The muffler space receives fluid from multiple discharge passages and allows the pressure fluctuations from different fluid chambers to cancel each other out, thereby reducing noise and vibration before the fluid enters the high-pressure fluid passage
Solution Approach 2:
Multiple discharge passages are merged into a single muffler space, allowing the pressure fluctuations from different fluid chambers to be combined in a way that they cancel each other out. This merging enables the harmful pressure fluctuations to neutralize themselves rather than being transmitted directly to the casing
2Object-generated harmful factors
If an odd number of helical grooves are used on the screw rotor, then the pressure waveforms can be shifted and canceled in the muffler space, but the design complexity increases
Solution Approach 1:
The number of helical grooves on the screw rotor is changed to an odd number, which fundamentally alters the pressure waveform characteristics. This parameter change enables the pressure fluctuations from different fluid chambers to be out of phase and cancel each other out in the muffler space, reducing noise and vibration
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 muffler space effectively minimizes pressure fluctuations and noise generation by canceling out pressure waveforms in the discharge passages, leading to reduced vibration and noise in the screw compressor operation.
Implementation Method 1
at least one muffler space (50) disposed in the casing (10), and communicating with the discharge passage (26, 27), thereby reducing a pressure fluctuation of the fluid flowing from the discharge passage (26, 27) to the high-pressure fluid passage (61, 64)
Implementation Method 2
the screw rotor (40) rotates, the fluid is sucked into the fluid chambers (23) to be compressed
Data Source
AI summary
A screw compressor includes a casing, a screw rotor, a discharge passage, and at least one muffler space. The casing includes a cylindrically-shaped cylinder, a main body surrounding a vicinity of the cylinder, and a high-pressure fluid passage provided between the main body and the cylinder. The screw rotor includes a plurality of helical grooves. The screw rotor is inserted into the cylinder to define fluid chambers. A fluid is sucked into the fluid chambers to compress the fluid. The discharge passage is disposed in the casing. The discharge passage guides the fluid that has been discharged from the fluid chambers to the high-pressure fluid passage. The at least one muffler space is disposed in the casing. The at least one muffler space communicates with the discharge passage so as to reduce a pressure fluctuation of the fluid flowing from the discharge passage to the high-pressure fluid passage.