Scroll Fluid Machine Adiabatic Expansion Chamber Cooling
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Solution Overview
Problem
In scroll fluid machines, the central parts, including bearings and seal members, are prone to deterioration due to heat buildup, especially when compressing toxic gases, as cooling the sealed central structure is challenging, leading to reduced durability.
Innovation Solution
The implementation of an adiabatic expansion chamber within the scroll fluid machine, which is larger in volume than the innermost compression chamber, allows for the introduction of compressed gas to expand and cool, effectively lowering the temperature of the central components, including the driving shaft and orbiting scroll, thereby preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealed structure is used to prevent toxic gas leakage, then safety and environmental protection are improved, but cooling of the central part becomes difficult, leading to heat buildup and deterioration of bearings and seal members
Solution Approach 1:
The compression chamber is divided into multiple stages (first compression chamber, second compression chamber, etc.), with each stage having its own compression and expansion sub-chambers. This segmentation allows for distributed heat management and adiabatic expansion cooling at different locations, preventing heat concentration in the central sealed area while maintaining the sealed structure for safety.
Solution Approach 2:
Adiabatic expansion sub-chambers are positioned upstream before the gas reaches the central discharge area. The gas undergoes expansion and cooling in these sub-chambers before entering the central region, preliminarily reducing the temperature of the compression medium so that it does not overheat the central bearings and seal members when the sealed structure is in place.
2Productivity
If multiple compression chambers are added to improve compression efficiency, then productivity is improved, but device complexity increases
Solution Approach 1:
Each compression chamber integrates both compression sub-chambers and expansion sub-chambers within a unified structure. The fixed wrap and orbiting wrap together define multiple compression chambers, each containing compression and expansion regions. This merging approach achieves multi-stage compression functionality without requiring separate independent compression units, thereby improving productivity while controlling device complexity.
Solution Approach 2:
The scroll structure serves multiple functions simultaneously: the fixed and orbiting wraps define compression chambers for gas compression, create expansion chambers for adiabatic cooling, and guide gas flow through the compression stages. This multi-functionality allows the same structural elements to achieve both high productivity through multi-stage compression and controlled complexity by avoiding redundant components.
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 solution effectively cools the central parts of the scroll fluid machine, enhancing the durability of bearings and seal members by reducing heat-related degradation, even when compressing toxic gases, by utilizing the adiabatic expansion chamber to lower the temperature of the gas before discharge.
Implementation Method 1
an adiabatic expansion chamber within the scroll fluid machine, which is larger in volume than the innermost compression chamber, allows for the introduction of compressed gas to expand and cool
Data Source
AI summary
A scroll fluid machine comprises a driving shaft having an eccentric axial portion at one end; a fixed scroll having a fixed wrap; and an orbiting scroll having an orbiting wrap and rotatably mounted to the eccentric axial portion of the driving shaft. A gas introduced through an inlet on the outer circumference of the fixed scroll is compressed by a compression chamber between the fixed and orbiting wraps towards the center and discharged through an outlet close to the center. Between the eccentric axial portion and the innermost winding portion of the fixed wrap, an adiabatic expansion chamber is formed thereby cooling the compressed gas right before discharging.