Backpack Blower Segmented Fans Reduce Noise
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Solution Overview
Problem
Conventional backpack-type blowers face a trade-off between increasing air blowing capability and noise levels, with larger fans or higher motor speeds leading to increased noise and inconvenience.
Innovation Solution
The use of multiple fans with corresponding motors and DC power supplies, configured to blow air together, allowing for increased air blowing capability without raising motor speed, while independent power paths and controllers manage power distribution to prevent noise and ensure efficient battery use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan size is increased to enhance air blowing capability, then the blowing capability is improved, but the device becomes larger and more cumbersome
Solution Approach 1:
The single fan system is segmented into multiple fans (first fan and second fan). Each fan operates independently with its own motor and power supply, allowing the system to achieve higher total airflow capability while keeping each individual fan compact and manageable in size.
2Productivity
If the motor rotational speed is increased to enhance air blowing capability, then the blowing capability is improved, but noise generation increases
Solution Approach 1:
The single high-speed motor is segmented into multiple motors (first motor and second motor), each operating at lower rotational speeds. This segmentation allows the system to achieve comparable or superior total airflow capability while significantly reducing noise generation, as lower-speed motors produce less noise.
3Device complexity
If a single battery supplies power to multiple fans, then the device structure is simplified, but the usable runtime is reduced due to current sharing
Solution Approach 1:
The single battery system is segmented into multiple independent power supply units (first DC power supply and second DC power supply), with each battery dedicated to powering its corresponding fan. This segmentation ensures that the full capacity of each battery is utilized for its respective fan, maximizing runtime without the current sharing losses inherent in single-battery multi-fan configurations.
4Adaptability or versatility
If multiple DC power supplies are used with varying output voltages, then power distribution flexibility is improved, but current leakage between power supplies occurs
Solution Approach 1:
A controller acts as an intermediary between the multiple DC power supplies with different output voltages and the corresponding fans. The controller manages power distribution, preventing direct electrical connection between power supplies with different voltages, thereby eliminating current leakage while maintaining the flexibility of having multiple power supplies with varying voltage outputs.
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 enhances usability by reducing noise, extending battery runtime, and preventing breakdowns by distributing power efficiently and detecting abnormalities to maintain air flow.
Implementation Method 1
a DC power supply configured to supply electric power to the fan via the power supply path
Implementation Method 2
a fan (10A, 10B) and a motor (12A, 12B) that rotationally drives the fan (10A, 10B), respectively
Data Source
AI summary
A backpack-type blower according to one aspect of the present disclosure includes a plurality of fans, a plurality of DC power supplies and a backpack. The plurality of fans and the plurality of DC power supplies are mounted on the backpack. The backpack-type blower is configured to blow winds from the plurality of fans together.