Axial Electric Blower Layout for Fast Air Speed Modulation
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Solution Overview
Problem
Existing portable blowers are heavy, noisy, polluting, and difficult to use due to high inertia and gyroscopic effects, with limited ability to quickly modulate air flow and speed, making them inefficient and tiring to operate, especially for professional use on large surfaces.
Innovation Solution
An autonomous electric portable blower with an axial propeller driven by an electronically commutated electric motor, housed in a central air guide duct made of heat-conducting materials, featuring an aerodynamic design with air inlet and outlet cones, and an electronic control system for adjustable air speed, reducing weight, noise, and inertia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a centrifugal turbine is used in portable blowers, then air blowing capability is achieved, but weight exceeds 4.5 kg and noise exceeds 100 dB
Solution Approach 1:
The patent replaces the traditional centrifugal turbine mechanical system with an axial propeller system driven by an electric motor. This substitution fundamentally changes the airflow generation mechanism, achieving comparable air blowing capability while significantly reducing weight and noise. The axial propeller design eliminates the heavy centrifugal turbine structure and associated high-speed rotation requirements.
Solution Approach 2:
The patent changes key operational parameters from the traditional centrifugal system: using lower rotational speeds with the axial propeller, changing the airflow path from radial to axial direction, and modifying the motor operating characteristics. These parameter changes enable achieving the same air moving capability with reduced weight and noise levels.
2Power
If heat engine or universal brushed electric motor is used, then air blowing function is achieved, but device becomes heavy and bulky
Solution Approach 1:
The patent substitutes the complex heat engine or universal brushed motor mechanical systems with a more compact electric motor and axial propeller system. This replacement eliminates bulky combustion chambers, exhaust systems, or complex commutator assemblies, resulting in a more compact overall device structure while maintaining air blowing functionality.
3Length of moving object
If high rotation speed is not achieved, then motor size is reduced, but airflow noise increases due to high peripheral speed in centrifugal turbines
Solution Approach 1:
The patent inverts the traditional centrifugal approach by using an axial propeller configuration. Instead of generating airflow through high peripheral speed at the turbine rim, the system generates airflow through axial thrust from the propeller blades, fundamentally reversing the noise generation mechanism and enabling lower operating speeds.
4Power
If centrifugal turbine with large diameter is used, then air blowing capacity is sufficient, but moment of inertia is high making quick modulation difficult
Solution Approach 1:
The patent replaces the high-inertia centrifugal turbine system with a low-inertia axial propeller system. The axial configuration with smaller effective radius dramatically reduces the moment of inertia, enabling rapid acceleration and deceleration of the airflow for quick adaptation to different working conditions while maintaining sufficient air blowing capacity.
5Strength
If rotating parts with high mass are used, then structural strength is sufficient, but gyroscopic effect causes wrist twisting
Solution Approach 1:
The patent changes the rotational parameters by using lower speeds and a different rotational configuration (axial propeller vs. centrifugal turbine). This parameter change significantly reduces the gyroscopic moment while maintaining sufficient structural strength through optimized propeller and motor design.
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 blower achieves reduced weight and noise, increased rotational speed, and improved efficiency, allowing for longer use on a single battery charge with a low Weight/Power ratio, and easy adaptation to different surface conditions.
Implementation Method 1
at least one axial propeller generating an air flow and driven by an electric motor
Implementation Method 2
said central part being a separate part from the other two and is arranged to constitute a functional assembly, one-piece or formed from an assembly of a plurality of elements and made of a material that is a good heat conductor
Data Source
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AI summary
The invention relates to a standalone portable electric blower, comprising at least one propeller (8) generating an airflow and driven by an electric motor powered by a power source, said blower including an air-guide conduit made up of a series of three generally cylindrical tubular portions, namely a proximal portion or suction nozzle provided with an air inlet, a distal air exit portion or exhaust nozzle and a central portion, characterised in that the central portion is arranged such as to form a functional assembly (6), unitary or made up of a plurality of elements and made of a material that is a good heat conductor, said central portion comprising the following functional sub-assemblies: an electronic switching electric motor (7); at least one axial propeller (8) rotated by the electric motor; air rectifiers (9); and an electronic board (10) for managing the tool and controlling the motor, said functional assembly being housed in the central or intermediate portion of said air-guide conduit with which said assembly engages.