Backpack Blower Airflow Layout for Cooling and Noise Reduction
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Solution Overview
Problem
Conventional backpack blowers suffer from poor heat dissipation, leading to high temperatures during battery discharge, incomplete discharge, and significant noise and air volume loss due to compact motor and fan arrangement under the backpack, which affects performance and user experience.
Innovation Solution
The backpack blower design includes a motor duct assembly in the air outlet assembly, separate from the air inlet tube, with a noise reduction sponge on the inlet tube and a heat dissipation hole for the circuit board, along with a heat dissipation system for the battery pack using centrifugal fans and air channels to manage airflow and temperature.
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 more compact, but the heat dissipation performance deteriorates
Solution Approach 1:
The patent divides the device into two separate functional modules: the backpack assembly (containing battery pack) and the blower body (containing motor, fan, and PCB board). This segmentation allows each module to be optimized independently - the backpack can be designed for portability while the blower body can be designed for effective heat dissipation, resolving the contradiction between structural compactness and heat dissipation performance.
Solution Approach 2:
The patent transitions from a single integrated unit to a distributed two-module structure, adding the dimension of spatial separation. The backpack assembly and blower body are connected via a flexible belt, allowing the components to be separated in space while maintaining functional integration, thereby improving heat dissipation without sacrificing overall system compactness.
2Device complexity
If the motor and fan are arranged under the backpack, then the structure is simplified, but the air speed and air volume loss increases
Solution Approach 1:
By separating the motor and fan into the blower body module rather than placing them under the backpack, the patent creates a dedicated airflow generation and delivery system. This segmentation allows for optimized airflow paths and reduced resistance, improving air speed and air volume while maintaining reasonable structural complexity.
3Device complexity
If the motor and fan are arranged under the backpack, then the structure is simplified, but the noise level increases
Solution Approach 1:
The patent separates the noise-generating components (motor and fan) into the blower body module, away from the backpack assembly. This spatial segmentation allows for better noise isolation and positioning of noise-sensitive components, reducing overall noise levels while maintaining structural simplicity through modular design.
4Weight of moving object
If a small battery pack is used to reduce weight, then the portability is improved, but the battery endurance decreases
Solution Approach 1:
The patent separates the battery pack into a removable backpack assembly that can be independently sized and configured. This segmentation allows users to choose appropriate battery capacities based on their specific needs - smaller packs for lightweight portability when short duration is acceptable, or larger packs for extended endurance when needed, optimizing the weight-endurance trade-off flexibly.
5Duration of action of moving object
If a backpack-type battery pack is used to improve endurance, then the battery capacity is increased, but the battery temperature increases leading to incomplete discharge
Solution Approach 1:
By separating the battery pack into its own modular backpack assembly, the patent enables independent thermal management design. High-capacity battery packs can be equipped with dedicated cooling systems, heat dissipation structures, or thermal insulation in the backpack module without affecting the blower body, allowing extended endurance while controlling battery temperature to prevent incomplete 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 reduces noise, maintains high air outlet efficiency, and ensures effective battery performance by minimizing air speed loss and temperature buildup, enhancing user experience and operational efficiency.
Implementation Method 1
a noise reduction sponge on the inlet tube
Implementation Method 2
a heat dissipation system for the battery pack using centrifugal fans and air channels to manage airflow and temperature
Implementation Method 3
a heat dissipation system for the battery pack using centrifugal fans and air channels to manage airflow and temperature
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.