Blower Bearing Holder Air-Path Structure for Heat Dissipation
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Solution Overview
Problem
Blowers face challenges in achieving high pressure, high flow rate, and high response while downsizing and weight reduction, with increased heat generation and reduced lifespan due to inadequate heat dissipation and vibration suppression in bearings.
Innovation Solution
A blower design with a metal bearing holding portion extending radially outward to form part of the air path, enhancing heat dissipation through the flange portion and integrating or separately assembling a flange portion with the bearing holding portion to improve heat conductivity and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the impeller rotates at high speed to meet the demand of high pressure and high flow rate, then the performance is improved, but the heat generated from the bearings increases, resulting in reduced life
Solution Approach 1:
The patent introduces a bearing holding portion made of heat-conductive material as an intermediary between the bearing and the fan casing. This intermediary component serves as a heat dissipation path, conducting heat away from the bearing to improve reliability while allowing the impeller to rotate at high speed for high productivity.
2Weight of moving object
If a resin material is used for the fan casing to meet the demand of downsizing and weight reduction, then the weight is reduced, but the heat dissipation is reduced, further increasing the bearing temperature
Solution Approach 1:
The patent applies local quality by using a heat-conductive material specifically for the bearing holding portion where heat dissipation is critical, while the rest of the fan casing can remain as lightweight resin material. This localized application of heat-conductive material addresses the bearing temperature issue without requiring the entire fan casing to be made of metal.
3Reliability
If the bearing holding portion is made of heat-conductive material to improve heat dissipation, then the bearing life is extended, but the weight of the blower increases
Solution Approach 1:
The bearing holding portion is made of heat-conductive material while the fan casing can be resin, creating a localized heat dissipation path that extends bearing life without requiring the entire structure to be heavy metal.
Solution Approach 2:
The patent employs composite material strategy by combining heat-conductive material for the bearing holding portion with resin material for the fan casing, achieving both heat dissipation and weight reduction goals simultaneously.
4Stability of the object's composition
If an anti-vibration member is assembled to suppress the vibration of the motor casing, then the vibration is reduced, but the heat dissipation is reduced and bearing temperature rises
Solution Approach 1:
The patent segments the vibration isolation function and heat dissipation function into separate components: the anti-vibration member handles vibration suppression between the motor casing and fan casing, while the bearing holding portion made of heat-conductive material provides a dedicated heat dissipation path for the bearing.
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 design improves bearing heat dissipation, extends lifespan, and maintains performance without increasing weight or part count, while suppressing air leakage and vibration.
Implementation Method 1
the bearing holding portion extending radially outward to a position facing the air path and forming part of the air path... the bearing holding portion is cooled to enable the enhancement of heat dissipation of the bearings
Implementation Method 2
Driving the motor to rotate the impeller allows the outside air to be suctioned into the fan casing from an axial direction and the compressed air to be delivered from radially outward
Data Source
AI summary
A blower improving heat dissipation of a bearing and achieving long operating life without increasing the number of parts is provided. A bearing holding portion rotatably supporting a motor shaft, to which a rotor of a motor and an impeller are assembled on two longitudinal sides, respectively via a bearing, is assembled to a fan casing, and part of the bearing holding portion adjacent to the impeller extends to a position facing an air path and forms part of the air path.