Backpack Blower Inlet Cover with Integrated Air Flow Guide Plate
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Solution Overview
Problem
Standard backpack blower housings have minimal clearance and vent locations, leading to inefficient airflow, debris sticking to the housing, and potential power source failure due to reduced airflow and increased strain.
Innovation Solution
An improved air inlet cover assembly with a plurality of vents and an integrated air flow guide plate that extends continuously around four sides of the fan assembly, distributing airflow over a larger area to reduce debris sticking and enhance airflow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fan size and power source are increased to achieve higher airflow, then the airflow capacity is improved, but the weight of the blower increases greatly, decreasing maneuverability
Solution Approach 1:
The inlet cover assembly is segmented into multiple sections with vents distributed across different surfaces (front, rear, left, right sides), allowing airflow to be collected from multiple locations simultaneously. This segmentation enables the system to achieve high airflow capacity without requiring a single large intake opening, thus maintaining a more compact and lighter overall design.
2Productivity
If the fan size is increased to achieve higher airflow, then the airflow capacity is improved, but the clearance within the blower housing is reduced, making it difficult to properly fit and secure components
Solution Approach 1:
The inlet cover assembly extends around four sides of the fan assembly in three-dimensional space, utilizing vertical and lateral dimensions to distribute vents across multiple surfaces. This dimensional approach allows adequate clearance to be maintained around the fan while still providing extensive airflow intake area, solving the clearance problem without sacrificing airflow capacity.
3Speed
If airflow is concentrated into a small area due to minimal clearance and vent locations, then the airflow speed into the housing increases, but debris sticks to the outside of the housing, reducing blower efficiency
Solution Approach 1:
Different regions of the inlet cover assembly provide different functions: vents on various sides capture airflow from different directions, while the air flow guide plate specifically manages the local airflow quality near the fan inlet. This local quality control prevents concentrated high-speed airflow from causing debris adhesion, maintaining blower efficiency while still achieving high overall airflow speed.
Solution Approach 2:
The air flow guide plate acts as an intermediary element between the incoming airflow and the fan assembly. It redistributes and guides the airflow smoothly into the fan inlet, preventing direct concentrated high-speed airflow from striking the housing and causing debris to stick. This intermediary structure maintains efficient airflow while preventing the harmful concentrated flow effect.
4Speed
If airflow is concentrated into a small area, then the airflow speed increases, but the suction-like effect causes debris to stick to the housing, potentially causing power source failure due to lack of airflow
Solution Approach 1:
The segmented vent distribution across four sides of the inlet cover assembly prevents concentrated airflow by dividing the intake into multiple smaller openings. This segmentation maintains adequate airflow speed through distributed intake while preventing the formation of strong localized suction effects that would cause debris adhesion and potential power source failure.
Solution Approach 2:
The air flow guide plate serves as a mediator that smooths and distributes airflow before it reaches the fan assembly. It prevents direct concentrated high-speed airflow from creating harmful suction effects on the housing, thereby protecting against debris accumulation and ensuring continuous reliable operation of the power source.
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 improved airflow distribution decreases the likelihood of debris sticking to the housing, increases the durability and run time of the backpack blower, and enhances user operability by maintaining airflow efficiency.
Implementation Method 1
a fan assembly to force air through the blower tube responsive to operation of the power source
Implementation Method 2
an air flow guide plate formed integrally therein to direct air flow inside the inlet cover assembly to the fan assembly
Data Source
AI summary
An inlet cover assembly for a blower may include a body, a plurality of vents to permit air flow into the fan housing, and an air flow guide plate formed integrally therein to direct air flow inside the inlet cover assembly to the fan assembly. The inlet cover assembly may extend continuously around four sides of the fan assembly. The blower may include a blower tube, a power source, a fan assembly to force air through the blower tube responsive to operation of the power source, and a fan housing disposed around the fan assembly. The fan assembly may define an axis about which a fan thereof rotates.