Backpack Blower Air Outlet Layout for Cooling and Noise Reduction
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Solution Overview
Problem
Conventional backpack blowers suffer from inadequate heat dissipation leading to incomplete battery discharge due to high power and current usage, resulting in reduced battery endurance and increased noise levels due to inefficient airflow and noise reduction mechanisms.
Innovation Solution
The backpack blower design incorporates a motor duct assembly within the air outlet assembly, featuring a duct body with a guiding cone and fan blade, and a heat dissipation system with a noise reduction sponge and centrifugal fans to manage airflow and temperature, ensuring efficient air outlet and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the motor, fan and PCB board are compactly arranged under the backpack, then the device structure is compact, but the heat dissipation is inadequate and noise is increased
Solution Approach 1:
The patent divides the blower system into separate functional modules: the motor duct assembly (containing motor and fan) is separated from the backpack assembly, and the PCB board is positioned in the air outlet assembly rather than under the backpack. This segmentation allows each component to be optimally positioned for its function, particularly enabling effective heat dissipation pathways for the motor and PCB while maintaining overall system compactness.
2Device complexity
If the blown air flow passes through the elbow and bellows, then the structure is simplified, but the air speed and air volume loss is large and noise is increased
Solution Approach 1:
The patent extracts the motor duct assembly containing the motor and fan from the traditional compact arrangement and positions it within the air outlet assembly. This extraction creates a more direct airflow path that bypasses the elbow and bellows for the main airflow, reducing turbulence and energy loss while maintaining structural simplicity.
Solution Approach 2:
The patent repositions the PCB board from the conventional location under the backpack to the air outlet assembly, utilizing the three-dimensional space differently. This dimensional reorganization optimizes the airflow path and heat dissipation without increasing overall device complexity.
3Duration of action of moving object
If a backpack-type battery pack is used to improve endurance, then the battery endurance is improved, but the battery temperature is high and discharge is incomplete
Solution Approach 1:
The patent introduces a heat dissipation system with heat dissipation fans and air channels as intermediaries between the battery pack and the external environment. The heat dissipation fans actively circulate air through dedicated air channels to remove heat from the battery pack, enabling the backpack-type battery to maintain high power output with effective temperature control throughout discharge.
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 design enhances air outlet efficiency, reduces noise, and improves battery endurance by effectively dissipating heat and managing airflow, resulting in higher air speed and volume with reduced noise and extended battery life.
Implementation Method 1
a heat dissipation fan, configured to drive air to flow into the battery cavity through the air channel
Implementation Method 2
The air inlet tube is provided with a noise reduction sponge
Data Source
AI summary
The disclosure provides a backpack blower, a backpack assembly and a backpack power assembly. The backpack blower includes a backpack assembly and a blower body. The backpack assembly is used for an operator to carry and comprises a battery pack cavity to house a battery pack. The blower body is mounted on the backpack assembly. The battery pack supplies power to the blower body. The blower body includes a motor duct assembly, an air inlet assembly assembled and fixed with the backpack assembly, and an air outlet assembly connected with the air inlet assembly. The air inlet assembly includes an air inlet and an air inlet tube connected to the air inlet. The air inlet tube is connected with the air outlet assembly. The motor duct assembly is housed in the air outlet assembly.