Debris Blower Flow Ejector for Switchable Velocity and Volume
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Solution Overview
Problem
Handheld debris blowers typically face a trade-off between high volumetric flow rate and high air stream velocity, requiring multiple blower tubes and nozzles to achieve both performance goals, which is inconvenient for users.
Innovation Solution
A handheld lawn debris blower with a flow ejector that can be configured between a closed and open position, allowing for either high-speed airflow or increased airflow rate by mixing ambient air with the primary airflow, eliminating the need for multiple blower tubes and nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the blower is designed for high volumetric flow rate, then it can move larger masses of debris, but air stream velocity decreases
Solution Approach 1:
The ejector is designed with movable components (such as a movable wall or gate) that can dynamically adjust between open and closed positions, allowing the blower to switch between high flow rate and high velocity modes without requiring multiple physical nozzles or tubes
Solution Approach 2:
The system changes the operational parameters of the ejector (open/closed position) to alter the airflow characteristics, enabling the same blower to provide different working conditions (high flow vs. high velocity) by modifying the ejector configuration rather than changing physical components
2Speed
If the blower provides high air stream velocity, then it can dislodge debris effectively, but volumetric flow rate decreases
Solution Approach 1:
The ejector's movable components enable dynamic adjustment between open and closed positions, allowing the blower to switch between high velocity and high flow rate modes using a single integrated device rather than multiple interchangeable nozzles
Solution Approach 2:
The ejector structure serves multiple functions: it acts as a flow control mechanism, a mixing chamber, and a velocity adjustment device all in one component, eliminating the need for separate nozzles or tubes for different operating modes
3Adaptability or versatility
If multiple blower tubes and nozzles are provided, then both high flow rate and high velocity settings are achievable, but device complexity increases
Solution Approach 1:
The ejector combines multiple functions (flow control, mixing, velocity adjustment) into a single integrated structure, merging what would traditionally require separate nozzles and tubes into one unified component that provides both high flow and high velocity capabilities
Solution Approach 2:
The ejector is designed as a multi-functional component that can operate in different configurations (open/closed) to provide different performance modes, making a single device universal enough to replace multiple specialized nozzles and tubes
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 can provide both high airflow and high air pressure/velocity settings without physical changes, enhancing productivity and operational range while maintaining efficient motor operation.
Implementation Method 1
a secondary airflow is introduced into the ejector, via the augmenting inlet, and mixed with the primary airflow to effectively increase the working airflow
Implementation Method 2
the mixing portion draws the secondary airflow from outside the blower tube through the augmenting inlet
Data Source
AI summary
A hand-held debris blower including a blower tube and an associated ejector. The blower includes an airflow generator adapted to generate a primary airflow that is directed into a blower tube. A flow ejector is operable to selectively increase a working airflow provided by the blower by selectively entraining a secondary airflow within the primary airflow.