Backpack Leaf Blower Layout for Direct Airflow and Wear Comfort
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Solution Overview
Problem
Existing leaf blower designs suffer from reduced efficiency due to air flow resistance caused by elbows or bends in the air path and are uncomfortable to wear due to the motor's distance from the user's back, leading to increased strain.
Innovation Solution
A backpack leaf blower design with a frame that positions the blower system to eliminate the need for elbows, aligning the motor's axis between 5-35 degrees with the back plate and the impeller's axis between 55-85 degrees with the back plate, placing the motor's center of gravity closer to the user's back, and using vibration isolating members to absorb vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor is positioned far from the user's back, then the blower system can be configured with standard orientations, but the user experiences increased strain and discomfort
Solution Approach 1:
The motor is repositioned from a conventional horizontal orientation to an angled orientation (5-35 degrees) relative to the back plate, utilizing the third dimension (angular space) to achieve both ergonomic weight distribution and functional airflow alignment simultaneously
2Productivity
If elbows or bends are included in the air path, then the device structure is simplified, but air flow resistance increases and efficiency decreases
Solution Approach 1:
The air path is designed with an asymmetric, angled configuration (55-85 degrees) that directly connects the impeller to the output nozzle, eliminating the need for symmetric elbow joints and bends that would create flow resistance
Solution Approach 2:
The output nozzle is pre-aligned with the impeller's airflow direction through the angled mounting configuration, ensuring that air flows directly from the impeller to the nozzle without requiring subsequent directional changes that would introduce resistance
3Productivity
If the motor axis is aligned perpendicular to the back plate, then the impeller can operate in a standard configuration, but the output nozzle requires additional bends to direct airflow
Solution Approach 1:
The impeller axis is oriented at an angle (55-85 degrees) relative to the back plate, utilizing angular dimension to align the airflow path directly with the output nozzle, thereby eliminating the need for additional bends in the nozzle configuration
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 enhances efficiency by reducing air resistance and improves comfort by distributing the weight more evenly, making the leaf blower easier to wear and use.
Implementation Method 1
The backpack leaf blower also includes vibration isolating members positioned between the blower system and the frame
Data Source
AI summary
A leaf blower to be worn by a user. The leaf blower including a frame having a back plate defining a back plate plane and a blower system coupled to the frame. The blower system includes a motor having drive shaft, the drive shaft defining an axis, and the axis forms an angle with respect to the back plate plane between about 5 degrees and about 35 degrees.