Scroll Machine Casing Reinforcement for Axial Vibration Control
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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 focus primarily on 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
1Stability of the object's composition
If reinforcing ribs are added to enhance casing rigidity, then axial vibrations are suppressed, but device complexity increases
Solution Approach 1:
The casing is divided into multiple functional zones by adding reinforcing ribs that extend axially from the leg section toward the compression chamber. These ribs segment the casing structure into regions with different rigidity requirements, allowing targeted reinforcement where axial vibrations occur most intensely while maintaining overall structural integrity.
Solution Approach 2:
Reinforcing ribs are added in the axial dimension to address axial vibrations, complementing the existing radial rib structure. This dimensional addition creates a three-dimensional reinforcement network that simultaneously addresses vibrations in multiple directions without interfering with the orbital motion mechanism.
2Ease of operation
If the leg section is positioned at the radially outer edge portion, then ease of installation is improved, but axial vibrations increase
Solution Approach 1:
The leg section is positioned at the radially outer edge portion for ease of installation and maintenance access, while reinforcing ribs are strategically added in the axial direction at and near the leg section. This creates local quality enhancement precisely where the leg section connects to the casing, compensating for the vibration instability caused by this peripheral positioning.
3Reliability
If auxiliary crank mechanisms are used for rotation prevention, then reliability is improved, but device complexity increases
Solution Approach 1:
Multiple auxiliary crank mechanisms are merged into a coordinated system where each crank mechanism works in conjunction with the others to provide redundant rotation prevention. The cranks are positioned at different angular locations around the orbiting scroll, creating a unified constraint system that enhances reliability through mutual support rather than isolated function.
Solution Approach 2:
The auxiliary crank mechanisms serve multiple functions simultaneously: they prevent rotation of the orbiting scroll, provide structural support during orbital motion, and help distribute mechanical loads evenly around the compression chamber. This multi-functionality reduces the need for separate dedicated components.
Data Source
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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.