Screw Compressor Slide Valve for Exhaust Pulsation Phase Cancellation

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Solution Overview

Problem

Screw compressors experience gas pulsation during the exhaust process, leading to reduced volumetric efficiency, increased power consumption, vibration, and noise, with existing attenuation devices being affected by lubricating medium accumulation, which shifts attenuation frequency and decreases effectiveness.

Innovation Solution

A screw compressor slide valve with internal through holes and a branched exhaust flow channel, designed to create a phase difference of 180 degrees between main and branched gas pulsations, effectively attenuating gas pulsation by optimizing the length difference between the two channels, thereby reducing vibration and noise without being influenced by lubricating medium accumulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a gas pulsation attenuation cavity is designed using the slide valve internal chamber, then gas pulsation attenuation is achieved, but lubricating medium accumulation shifts the attenuation frequency and decreases effectiveness

Engineering Contradiction:

Improvegas pulsationVSAvoidattenuation effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent extracts the harmful lubricating medium from the attenuation cavity by introducing a separate drainage channel. This channel allows the lubricating medium to be discharged from the exhaust chamber directly to the exhaust outlet, preventing accumulation in the attenuation cavity and maintaining stable attenuation frequency and effectiveness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent segments the exhaust flow path into two separate channels: one for gas pulsation attenuation (through the attenuation cavity) and another for lubricating medium drainage. This segmentation allows independent handling of gas and lubricating medium flows, preventing interference between the two functions.

Inventive Principle:

Principle #1Segmentation

2Object-affected harmful factors

If the slide valve structure is modified to add attenuation functionality, then gas pulsation is reduced, but device complexity increases

Engineering Contradiction:

Improvegas pulsationVSAvoidslide valve structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the gas pulsation attenuation function with the existing slide valve structure. By utilizing the internal chamber of the slide valve as the attenuation cavity and integrating the drainage channel into the valve body, the design achieves pulsation attenuation without requiring a separate standalone device, thus minimizing structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The slide valve is designed to perform multiple functions simultaneously: exhaust flow control, gas pulsation attenuation, and lubricating medium drainage. This multi-functionality eliminates the need for separate components for each function, reducing overall device complexity while maintaining effectiveness.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 solution achieves significant attenuation of gas pulsation, reducing vibration and noise in screw compressors by ensuring opposite phases of gas pulsation in the main and branched channels, maintaining effectiveness regardless of lubricating medium content and being simple, low-pressure-loss, and easy to manufacture and install.

Implementation Method 1

designed to create a phase difference of 180 degrees between main and branched gas pulsations

Methodology Applied

Scientific EffectPhase difference:

Implementation Method 2

effectively attenuating gas pulsation by optimizing the length difference between the two channels

Methodology Applied

Scientific EffectGas pulsation attenuation:

Implementation Method 3

reducing vibration and noise by ensuring opposite phases of gas pulsation in the main and branched channels

Methodology Applied

Scientific EffectVibration reduction:

Implementation Method 4

reducing vibration and noise in screw compressors

Methodology Applied

Scientific EffectNoise reduction:

Data Source

PatentUS11920594B2Screw compressor slide valve and screw compressor with gas pulsation attenuation function

Publication Date: 2024.03.05 XI AN JIAOTONG UNIV

AI summary

A screw compressor slide valve with gas pulsation attenuation function includes valve walls and internal through holes. A screw compressor includes the screw compressor slide valve. A part of exhausted gas of the screw compressor is directly discharged from an exhaust port to an exhaust chamber to form a main exhaust flow channel; another part of the exhausted gas is discharged from the exhaust port into the exhaust chamber after being delayed by the internal through holes, which forms a branched exhaust flow channel. Since the branched exhaust flow channel is longer than the main exhaust flow channel, when the gas pulsation in the branched exhaust flow channel lags behind that in the main exhaust flow channel by 180-degree in phase, two gas pulsations in the two flow channels are offset due to opposite gas pulsation phases, which attenuates the gas pulsation, thereby suppressing induced vibration and noise.