Centrifugal Blower Blade Geometry for Lower-Speed Airflow
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Solution Overview
Problem
Transport climate control systems face inefficiencies in power consumption due to high operating speeds of centrifugal blowers, which can lead to increased energy requirements without corresponding improvements in airflow efficiency.
Innovation Solution
A centrifugal blower design featuring a saucer-shaped blower base with multiple blades and a casing providing a 25 mm clearance, where each blade is trimmed near the leading edge to create a slant face, allowing for lower operating speeds while maintaining airflow efficiency by optimizing blade configuration with a chord length of 171 mm, stagger angle of 30°, and leading edge camber angle of 20°, housed within an evaporator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the centrifugal blower operates at high speeds to maintain airflow efficiency, then the airflow performance is improved, but the power consumption increases
Solution Approach 1:
The patent applies parameter changes by optimizing specific geometric parameters of the centrifugal blower blades, including chord length (171 mm), stagger angle (30°), and leading edge camber angle (20°). These parameter modifications enable the blower to achieve required airflow performance at lower operating speeds, thereby reducing power consumption while maintaining productivity
Solution Approach 2:
The patent implements dynamics by trimming the blades near the leading edge to create a slant face, which optimizes the blade geometry for dynamic airflow conditions. This dynamic optimization allows the blower to operate efficiently at reduced speeds by improving the interaction between the blades and airflow
2Productivity
If the blade clearance is reduced to improve airflow efficiency, then the airflow performance is improved, but the risk of blade-casing contact increases
Solution Approach 1:
The patent establishes an optimized clearance parameter of 25 mm between the blade tips and the casing, with a controlled variance of +/− 10%. This parameter optimization maintains efficient airflow by keeping the clearance small enough to prevent excessive leakage, while simultaneously ensuring reliable operation by preventing blade-casing contact even under manufacturing tolerances and operational variations
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
The customized centrifugal blower operates at lower speeds than traditional designs, reducing power requirements while maintaining or exceeding airflow efficiency, thereby enhancing energy efficiency in climate-controlled transport units.
Implementation Method 1
centrifugal blower that may be included in a transport climate control system to control the heat exchange between the air within the climate controlled space and the ambient air outside of the climate controlled transport unit
Data Source
AI summary
A centrifugal blower includes a blower base, multiple blades fastened to the blower base, a hub integrated to a central portion of the blower base, and a top shroud to provide surrounding coverage to the multiple blades. The centrifugal blower is housed within an evaporator. The centrifugal blower may operate at operating speeds that are lower than those of typical or currently known implementations while generating an airflow that meets or even exceeds those of the typical or currently known implementations.