Shrouded Mixed Flow Impeller Cooling for Compact Centrifugal Blowers
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Solution Overview
Problem
Existing blower designs for fuel cell systems face challenges in efficiently cooling motors, leading to increased noise, size, and cost, while traditional cooling methods are inadequate for high-speed and compact enclosures, often resulting in bearing overheating and reduced reliability.
Innovation Solution
The proposed blower design incorporates a mixed flow impeller and a volute with a high aspect ratio elliptical cross-section, where the volute acts as an active heat sink, and a motor housing with a finned radiator, eliminating the need for a traditional cooling fan, and utilizing a mixed flow impeller to circulate air for direct bearing cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional cooling fans are used to cool motor bearings, then cooling effectiveness is improved, but device complexity and noise increase
Solution Approach 1:
The patent removes the traditional cooling fan component entirely and extracts its cooling function, integrating it instead into the impeller design. The impeller blades are configured to directly move air across the motor bearings, eliminating the need for a separate cooling device while reducing overall system complexity and noise.
Solution Approach 2:
The cooling function is merged with the impeller's primary air-moving function. The impeller serves dual purposes: pressurizing air for the fuel cell system and simultaneously cooling the motor bearings through direct air flow, thereby consolidating multiple functions into a single component.
2Volume of moving object
If compact motor housing is used to reduce size, then space efficiency is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The motor housing design enables self-cooling through the impeller-driven air flow. The housing incorporates features that channel the air flow generated by the impeller directly across the motor and bearing areas, allowing the motor to cool itself using the system's operational air flow without requiring external cooling infrastructure.
3Productivity
If high-speed operation is implemented to improve productivity, then air flow rate increases, but bearing overheating risk increases
Solution Approach 1:
The patent ensures continuous cooling action by designing the impeller to generate persistent air flow across the bearings during operation. The cooling effect is maintained continuously throughout the operational cycle, with the air flow path configured to constantly remove heat from the bearings as the impeller rotates at high speeds.
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 enhances thermal management, reduces noise and size, increases reliability, and improves efficiency by effectively cooling motor bearings and transferring heat away from the motor, while reducing the number of components and operational costs.
Implementation Method 1
a mixed flow impeller disposed in the motor housing and coaxially mounted to the motor shaft, wherein the mixed flow impeller is configured to circulate air inside the motor housing
Implementation Method 2
a volute disposed on an outer surface of the motor housing, wherein the volute acts as an active heat sink
Data Source
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AI summary
A blower includes a motor housing, a volute disposed on an outer surface of the motor housing, a motor shaft extending through the motor housing, a motor disposed in the motor housing and coaxially mounted to the motor shaft, and a mixed flow impeller disposed in the motor housing and coaxially mounted to the motor shaft. The mixed flow impeller is configured to circulate air inside the motor housing.