Electric blower, vacuum cleaner, and hand drying device
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Solution Overview
Problem
The existing electric blowers experience a decrease in operating life due to thrust loads on the motor shaft and bearings, caused by pressure differences between the intake and outlet sides, leading to increased friction and reduced bearing life.
Innovation Solution
The electric blower design incorporates a configuration with two rotor blades and two stator blades, where the thrust forces generated by each rotor blade are opposite in direction, canceling each other out, thereby reducing the thrust load on the motor and preventing a decrease in operating life. Additionally, wind guide plates direct air currents to enhance aerodynamic efficiency and heat radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rotor blade is used in the electric blower, then the device structure is simple, but thrust load occurs on the motor shaft and bearings due to pressure difference, reducing operating life
Solution Approach 1:
The patent applies the counterweight principle by introducing a second rotor blade that generates thrust force in the opposite direction to cancel out the thrust force from the first rotor blade. The two rotor blades are positioned on opposite sides of the motor in the axial direction, creating balanced thrust forces that eliminate the net thrust load on the motor shaft and bearings, thereby preventing friction and extending operating life while maintaining relatively simple device structure.
Solution Approach 2:
The patent employs asymmetry by positioning rotor blades and stator blades in specific asymmetric configurations relative to the motor. The first rotor blade faces the first stator blade, and the second rotor blade faces the second stator blade, creating a balanced asymmetric layout that generates equal and opposite thrust forces. This asymmetric arrangement allows for thrust cancellation while optimizing airflow patterns.
2Reliability
If multiple rotor blades and stator blades are added to cancel thrust forces, then the thrust load on the motor is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple rotor blades and stator blades into a unified thrust-cancellation system. The first rotor blade with its corresponding first stator blade, and the second rotor blade with its corresponding second stator blade, work together as an integrated assembly. This merging approach allows the multiple blades to cooperate in canceling thrust forces while maintaining a compact and relatively simple overall device structure.
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 configuration effectively reduces thrust loads on the motor and bearings, prolongs the operating life of the blower, and enhances aerodynamic efficiency by efficiently guiding air currents and facilitating heat radiation.
Implementation Method 1
thrust force occurs in the shaft of the motor and the blade part due to pressure difference between the intake side and the outlet side
Implementation Method 2
friction occurs between an inner ring and an outer ring of the bearing
Implementation Method 3
a case where the shaft is supported by a bearing
Data Source
AI summary
An electric blower includes a motor, a first rotor blade provided on one end side of the motor in an axial direction, a second rotor blade provided on another side of the motor opposite to the first rotor blade in the axial direction, and a first stator blade provided to face the first rotor blade.