Screw Compressor Gear Box Annular Rib Vibration Control
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Solution Overview
Problem
Screw compressors experience inefficient vibration reduction due to unaddressed natural vibration modes, leading to increased vibration and potential breakage.
Innovation Solution
The implementation of an annular rib configuration around attachment holes in the gear box of the screw compressor, specifically designed to enhance rigidity against specific natural vibration modes, includes strategically placed rib regions and varying plate thicknesses to balance torsion and reduce vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the gear box structure is modified to reduce vibration, then vibration reduction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding annular ribs specifically around the attachment holes where the compressor main body connects to the gear box. This localized structural modification concentrates rigidity enhancement at the critical vibration transmission points rather than uniformly strengthening the entire gear box, thereby reducing vibration effectively while minimizing overall structural complexity and material usage.
2Object-affected harmful factors
If the rigidity of the gear box is increased to reduce vibration, then vibration reduction is improved, but manufacturing cost increases
Solution Approach 1:
The annular ribs are positioned specifically around the attachment holes based on vibration analysis identifying these as critical areas. This localized approach increases rigidity only where needed to combat vibration, avoiding the need to strengthen the entire gear box structure, thus controlling manufacturing costs while achieving effective vibration reduction.
Solution Approach 2:
The gear box structure is segmented into critical areas (around attachment holes) and non-critical areas. The annular ribs are applied only to the critical segments, allowing differential reinforcement that optimizes vibration reduction while minimizing material consumption and manufacturing complexity.
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 vibration and enhances the compressor's resistance to breakage by improving rigidity and balancing torsion, thereby addressing the inefficiencies in existing vibration reduction methods.
Implementation Method 1
the natural vibration mode is not studied in detail, and efficient vibration reduction is not achieved
Implementation Method 2
When the natural frequency and the rotational speed of the compressor main body coincide, a resonance phenomenon occurs, and the vibration of the bearing portion of the compressor main body increases
Implementation Method 3
a central upper rib being a rib on an upper side of the third rib portion is arranged above an imaginary center line connecting a center of the first attachment hole and a center of the second attachment hole, and a central lower rib being a rib on a lower side of the third rib portion is arranged below the imaginary center line
Data Source
AI summary
The screw compressor includes a first-stage compressor main body and a second-stage compressor main body for compressing fluid with screw rotors, a motor for driving the first-stage compressor main body and the second-stage compressor main body, and a gear box. The gear box is connected to the first-stage compressor main body, the second-stage compressor main body, and the motor; transmits a driving force of the motor to the screw rotors, and includes a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body; and is provided with an annular rib surrounding both of the first attachment hole and the second attachment hole. In the screw compressor, the vibration of the natural vibration mode which is most burdensome and should be reduced can be efficiently reduced.