Scroll Wrap Section Thickness Gradient for Thermal Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In scroll type fluid machines, thermal deformation during operation leads to non-uniform gaps between wrap sections, causing leakage and reducing compression efficiency due to uneven thermal expansion effects, which complicates maintaining optimal wrap section contact to prevent air leakage.
Innovation Solution
The design includes a first and second scroll member with spiral wrap sections and cooling fins on their back surfaces, featuring projected sections with varying thickness differences in the radial direction at their ends, allowing for dynamic adjustment of the wrap gap to prevent contact and minimize leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between wrap sections is reduced to prevent leakage, then sealing performance is improved, but wrap sections come into contact during thermal deformation
Solution Approach 1:
The patent applies local quality by varying the thickness of the wrap section at different locations. Specifically, the wrap section has a first thickness in a first region and a second thickness in a second region, allowing different parts of the wrap section to have different mechanical properties. This enables the wrap section to maintain appropriate gap clearance in some regions while providing enhanced sealing in other regions, thus resolving the contradiction between preventing leakage and avoiding contact during thermal deformation.
Solution Approach 2:
The patent utilizes parameter changes by modifying the thickness parameter of the wrap section along its length. The thickness varies from the first value to the second value, creating a gradient structure that adapts to the thermal deformation characteristics. This parameter variation allows the wrap section to compensate for thermal expansion differences, maintaining optimal gap clearance while preventing leakage paths.
2Ease of manufacture
If uniform thickness is maintained in wrap sections, then manufacturing is simplified, but non-uniform thermal deformation causes variable gaps and leakage
Solution Approach 1:
The patent implements local quality by creating regions with different thickness characteristics within the wrap section. The first region has a first thickness and the second region has a second thickness, allowing each region to be optimized for its specific functional requirements. This local differentiation improves sealing performance in critical areas while maintaining manufacturing feasibility through defined regional specifications.
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 enhances compression efficiency by reducing air leakage while preventing wrap section contact, optimizing the gap between the scroll members based on thermal deformation to maintain efficient operation.
Implementation Method 1
cooling fins arranged on a back side surface of the end plate of at least one of the first scroll member and the second scroll member
Implementation Method 2
cooling fins arranged on a back side surface of the end plate
Implementation Method 3
the wrap section formed in the scroll is thermally deformed by compression heat at the time of operation
Data Source
AI summary
A scroll type fluid machine for improving compression efficiency while preventing contact between wrap sections of opposed scrolls, includes a first scroll member provided with a wrap section of a spiral shape on an end plate, a second scroll member disposed at a position opposed to the first scroll member and provided with a wrap section of a spiral shape on an end plate, cooling fins arranged on a back side surface of the end plate of at least one of the first scroll member and the second scroll member, and projected sections arranged on the wrap section of at least one of the first scroll member and the second scroll member, in which a difference of thicknesses in the radial direction of the wrap section at a distal end and a base end of the projected sections is changed depending on a position in a peripheral direction.