Backpack Blower Discharge Venting for Reducing User Heat Buildup
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Solution Overview
Problem
Current backpack blowers generate excessive heat near the user's back during use, particularly in hot weather, causing discomfort during lawn and garden work.
Innovation Solution
A backpack blower with an air discharge pipe that includes openings to divert a portion of the high-velocity air stream onto the user, optionally with adjustable deflectors and control devices to regulate airflow for comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blower generates high-velocity air stream for propelling objects, then the blowing performance is improved, but heat is generated near the user's back causing discomfort
Solution Approach 1:
The patent converts the harmful high-velocity air stream (which causes heat buildup) into a beneficial cooling mechanism by redirecting it through openings in the discharge pipe onto the user's back, transforming the harmful thermal effect into a useful cooling function
Solution Approach 2:
The air discharge pipe is segmented with multiple openings along its length, allowing portions of the air stream to be diverted at different locations to cool different areas of the user's back, while the main stream continues to provide blowing functionality
2Object-affected harmful factors
If openings are added to the air discharge pipe to divert air onto the user, then user comfort is improved, but the device complexity increases
Solution Approach 1:
The air discharge pipe serves multiple functions: it propels objects forward through the main air stream while simultaneously cooling the user through diverted portions of the same air stream via openings, making the single component multi-functional without adding separate cooling systems
Solution Approach 2:
The blower's own high-velocity air stream is used to cool the user, eliminating the need for external cooling systems or additional power sources. The system serves itself by utilizing its operational output for thermal management
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 solution effectively cools the user by redirecting a portion of the air stream, improving comfort and reducing heat-related discomfort during operation.
Implementation Method 1
a stream of high velocity air which is conducted through an air discharge pipe to propel objects along the ground... divert a portion of the stream of high velocity air conducted through the air discharge pipe onto a user to cool the user
Data Source
AI summary
A backpack blower includes a motorized blower unit driven by an engine mounted to a frame having straps to be supported by a user's shoulders and having an air discharge pipe with openings which allow a portion of the air discharge to blow out onto a wearer's neck, head, and/or body. A deflector can further be added to direct the air discharge and the deflector can be adjustable. One or both of the deflector and openings can include a control device which allows for flow through the opening or deflector to be stopped or the volumetric flow rate of air passing there-through can be adjusted.