Scroll Casing Rib Structure for Axial Vibration Suppression
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Solution Overview
Problem
Scroll-type fluid machines used in industrial applications experience significant axial vibrations due to the orbital motion of the orbiting scroll, which are not adequately addressed by existing technologies that primarily focus on reducing radial vibrations.
Innovation Solution
The implementation of reinforcing ribs extending in the axial direction from the leg sections to the bearing bosses, enhancing the rigidity of the casing and supporting structures to suppress axial vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If reinforcing ribs are added to enhance casing rigidity, then axial vibrations are reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding reinforcing ribs specifically to the leg section and bearing boss areas where axial vibrations occur most intensely. Instead of uniformly strengthening the entire casing, the reinforcement is localized to critical regions, thereby reducing axial vibrations while minimizing the increase in overall device complexity.
2Ease of operation
If the leg section is positioned at the radially outer edge portion, then ease of installation is improved, but axial vibrations are intensified
Solution Approach 1:
The patent maintains the beneficial radial positioning of the leg section for ease of installation while locally reinforcing the leg section and bearing boss areas with ribs. This localized reinforcement counteracts the axial vibrations intensified by the outer-edge positioning without requiring a change in the overall leg section location.
3Reliability
If auxiliary crank mechanisms are used for rotation prevention, then reliability is improved, but axial vibrations increase
Solution Approach 1:
The patent retains the auxiliary crank mechanisms for reliable rotation prevention of the orbiting scroll while adding local reinforcement in the form of ribs to the leg section and bearing bosses. This localized structural reinforcement specifically addresses the axial vibrations generated by the auxiliary crank mechanisms without compromising their rotation prevention function.
Data Source
AI summary
A scroll-type fluid machine includes a casing that houses an orbiting scroll and a plurality of auxiliary crank mechanisms, a leg section that is disposed on a radially outer edge portion of the casing and supports the casing, and a reinforcing rib that extends on the leg section in the axial direction. The casing includes bearing bosses that each house a casing-side bearing of the auxiliary crank mechanism. The bearing boss has an outer circumferential surface and an end surface that form part of the outer surface of the casing. The reinforcing rib extends from the leg section to the bearing boss so as to be connected to the leg section and to the outer circumferential surface and the end surface of the bearing boss.