Scroll Fluid Machine Cooling via Segmented Housing Air Passages
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Solution Overview
Problem
Existing scroll fluid machines, such as scroll vacuum pumps and compressors, face issues with excessive wear, deformation, and oil leakage due to high temperatures in axial end portions and bearings, leading to reduced performance and durability, and existing cooling solutions either inadequately cool critical components or increase size, weight, and cost with multiple fans.
Innovation Solution
A scroll fluid machine design that utilizes a housing with a sealed compression chamber and strategically placed fans to circulate cooling air efficiently, including a rearward blowing axial fan and secondary annular sucking holes to mix and direct cooled air to heat-prone areas, ensuring uniform cooling without the need for multiple fans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single fan is mounted to cool the driving shaft and bearing, then cooling function is provided, but the cooling air temperature rises considerably making it difficult to cool elements behind the motor
Solution Approach 1:
The housing is divided into multiple air passage regions: a first air passage for drawing in cooling air, a second air passage for discharging heated air, and a third air passage specifically for cooling the motor. This segmentation allows independent cooling flows for different components, preventing temperature rise in the cooling air that would compromise cooling effectiveness behind the motor.
Solution Approach 2:
Different regions of the housing are assigned different cooling functions with dedicated air passages. The motor receives dedicated cooling air flow separate from the bearing and scroll compression chamber cooling, ensuring each component receives appropriately cooled air without being affected by heated air from other regions.
2Temperature
If cooling fans are mounted in front of and behind the engaging portion to cool all parts uniformly, then all parts are cooled uniformly, but the whole size, weight and cost increase
Solution Approach 1:
The housing structure serves multiple cooling functions simultaneously through its integrated air passage design. The same housing that provides structural support also contains the first, second, and third air passages that cool different components (scroll compression chamber, bearing, and motor) without requiring separate cooling systems or additional fans.
Solution Approach 2:
The housing itself provides the cooling function through its built-in air passage structure. The housing draws in cooling air, directs it through different passages to cool various components, and discharges heated air, eliminating the need for external cooling fans and reducing overall system weight.
3Temperature
If cooling fans are mounted in front of and behind the engaging portion to cool all parts uniformly, then all parts are cooled uniformly, but consumed electricity increases
Solution Approach 1:
The cooling function is extracted from the motor and integrated into the housing structure. The housing contains dedicated air passages that utilize the motor's operational airflow to cool the motor and other components, eliminating the need for separate powered cooling fans and reducing electricity consumption.
4Temperature
If cooling fans are mounted in front of and behind the engaging portion to cool all parts uniformly, then all parts are cooled uniformly, but noise from cooling fans increases
Solution Approach 1:
The housing structure provides cooling through its integrated air passage design, utilizing the existing airflow generated by the motor's operation. This self-service cooling approach eliminates the need for additional powered cooling fans, thereby reducing noise generation while maintaining effective cooling of all 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 design effectively cools the motor and other parts using circulating air, reducing wear and deformation, while minimizing size, weight, and energy consumption, and addresses the inefficiencies of prior cooling methods.
Implementation Method 1
circulating air through or around a housing
Data Source
AI summary
A scroll fluid machine comprises a housing having a fixed scroll and an orbiting scroll revolved by a driving shaft which is driven by a motor behind the housing. A blowing fan is provided between the orbiting scroll and the motor. Rotation of the fan causes decompression in the housing to allow primary external air to be sucked from the outside into the housing through a primary sucking hole. Secondary external air is introduced from a secondary sucking hole and mixed with the primary external air of the scroll fluid machine to cool the parts of the scroll fluid machine in the housing and/or the motor.