Screw Compressor Coupling Casing Rib Design
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Solution Overview
Problem
Screw compressors with coupling casings experience reduced rigidity and increased vibration due to the weight of the motor and compressor body, leading to potential breakage and increased maintenance costs when attempting to improve maintainability.
Innovation Solution
Incorporating a work hole in the horizontal direction and a rib extending in the up-down direction within the coupling casing to enhance shear rigidity without increasing material weight or costs, allowing for improved maintainability and rigidity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a work hole is provided in the coupling casing to improve maintainability, then the coupling can be maintained more easily, but the shear rigidity in the vertical direction of the coupling casing is significantly reduced
Solution Approach 1:
The invention adds a rib extending in the up-down direction (vertical dimension) to compensate for the rigidity loss caused by the horizontal work hole. This dimensional addition reinforces the coupling casing structure without blocking the maintenance access provided by the work hole.
2Strength
If the thickness of the tubular portion of the coupling casing is increased to compensate for rigidity, then the shear rigidity is improved, but the weight of the material becomes larger
Solution Approach 1:
Instead of uniformly increasing the thickness of the entire tubular portion, the invention segments the reinforcement by adding a rib only in specific locations where structural support is needed. This localized reinforcement maintains rigidity while minimizing material usage and weight increase.
3Strength
If a radial rib is provided in the tubular portion of the coupling casing to compensate for rigidity, then the shear rigidity is improved, but the weight of the material becomes larger
Solution Approach 1:
The rib is provided only in the specific location where rigidity compensation is needed, rather than uniformly throughout the coupling casing. This localized structural modification improves shear rigidity while minimizing the addition of material weight.
Data Source
AI summary
A screw compressor includes compressor bodies, a motor disposed in a side of the compressor bodies, a gear box coupled to the compressor bodies and transmitting the drive force of the motor to a screw rotor, and a tubular coupling casing coupling the gear box and the motor and having horizontal axis. The coupling casing has a work hole in the horizontal direction. The work hole is used for maintaining a coupling accommodated in the coupling casing. The coupling casing has a rib extending in the up-down direction. It is thus possible to avoid reduction in the rigidity of the coupling casing with no cost increase, and to improve maintainability.