Backpack blower
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Solution Overview
Problem
Conventional backpack blowers face limitations due to battery packs with low output voltage and power insufficiency, leading to poor performance and stability issues when used for high-power applications, as increasing voltage results in larger and heavier battery packs.
Innovation Solution
The design incorporates a backpack blower system with a power supply featuring multiple battery packs and a strategic arrangement of the center of gravity to balance weight, along with a duct assembly and motor configuration that generates high airflow, and a strap assembly for improved user comfort and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output voltage of the battery pack is increased by increasing the number of cells, then the power output is improved, but the outer dimension and weight of the battery pack are increased
Solution Approach 1:
The battery pack is divided into multiple individual battery cells (e.g., five 5Ah cells) connected in series, rather than using a single large-capacity cell. This segmentation allows achieving high voltage (e.g., 54.6V) while distributing the weight and allowing flexible arrangement to optimize center of gravity positioning.
Solution Approach 2:
The battery pack intentionally creates asymmetric weight distribution by positioning the battery pack's center of gravity away from the backpack device's center of gravity. This asymmetric arrangement, combined with adjustable straps, allows the user to balance the overall system by shifting the battery pack position or adjusting strap tension, thereby improving comfort without reducing power output.
2Power
If the output voltage of the battery pack is increased by increasing the number of cells, then the power output is improved, but the outer dimension of the battery pack is increased
Solution Approach 1:
Multiple battery cells are arranged in a compact series configuration, segmented into individual units that can be tightly packed. This segmentation enables achieving high voltage through series connection while minimizing the overall volume by efficient spatial arrangement of the cells within the battery pack housing.
Solution Approach 2:
The battery cells are nested within a compact battery pack structure, with each cell positioned to maximize space utilization. The cells are arranged in a nested-like configuration where they fit together efficiently, reducing the overall outer dimensions of the battery pack while maintaining the required number of cells for high power output.
3Productivity
If high power is used to increase airflow output, then the blowing performance is improved, but the weight and size of the power supply are increased
Solution Approach 1:
The power supply uses multiple battery cells connected in series to achieve high voltage and high power output for driving the motor at high speeds (≥25000 RPM) and generating high airflow (≥720 CFM). The segmented cell structure allows achieving the required power level while distributing the weight and enabling flexible positioning to balance the center of gravity.
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 the power supply's stability and user experience by balancing weight distribution, increasing airflow, and improving carrying comfort, while maintaining a compact and efficient design.
Implementation Method 1
a motor, a fan, and a duct assembly, wherein the motor drives the fan to rotate to generate an airflow
Implementation Method 2
a power supply for supplying electrical energy; the power supply includes at least two battery packs
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A backpack blower includes a blower device, a power supply (2), and a backpack device (3). The backpack device (3) includes a device body (31) and a strap assembly (32). The strap assembly (32) is worn by a user. The strap assembly (32) has a first center plane (P), and the center of gravity (O) of the power supply (2) and the blower device (1) are separately located on two sides of the first center plane (P).