Backpack Sprayer Gravity Center Stability via Component Overlap
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Solution Overview
Problem
The existing backpack working machines become difficult to use when the liquid in the tank decreases, as the gravity center position shifts away from the user's back, causing instability and imbalance.
Innovation Solution
The configuration includes a body unit with a battery unit above the fan unit and a liquid tank disposed above the battery unit, ensuring that 50% or more of each component overlaps when viewed from above, maintaining the gravity center position and preventing the machine from becoming unbalanced, even as the liquid level decreases. Additionally, the shoulder harness unit is designed to distribute the weight evenly, with the gravity center of the battery, fan, and liquid tank positioned within a third of the body unit's width in both the front-rear and left-right directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the liquid tank is disposed above the battery unit and fan unit, then the machine can be compact and portable, but the gravity center shifts away from the user's back when liquid decreases
Solution Approach 1:
The patent positions the liquid tank, battery unit, and fan unit in an asymmetric overlapping arrangement viewed from above, with their combined gravity center deliberately located within one-third of the body unit's width from the rear surface. This asymmetric distribution maintains compactness while ensuring the gravity center remains close to the user's back even as liquid level changes.
Solution Approach 2:
The patent utilizes vertical stacking (up-down direction) combined with horizontal overlap (front-rear and left-right directions) to achieve compactness. By arranging components in multiple dimensions with significant overlap when viewed from above, the design maintains a compact footprint while controlling the horizontal position of the gravity center to prevent it from shifting away from the user's back.
2Volume of moving object
If the battery unit, fan unit, and liquid tank are arranged vertically stacked, then space is optimized, but the machine becomes unbalanced when liquid is consumed
Solution Approach 1:
The patent employs asymmetric horizontal positioning of the battery unit, fan unit, and liquid tank within the body unit's width. When viewed from above, these components overlap each other by 50% or more and are positioned such that their combined gravity center lies within one-third of the body unit's width from the rear surface, preventing imbalance during operation.
Solution Approach 2:
The design combines vertical stacking with controlled horizontal overlap to optimize space utilization while maintaining balance. The components are arranged in the up-down direction with significant horizontal overlap when viewed from above, ensuring compact space usage while the gravity center remains positioned to maintain usability throughout operation.
3Stability of the object's composition
If the gravity center is positioned within one-third of the body unit width from the rear surface, then balance is maintained, but the arrangement becomes complex
Solution Approach 1:
The patent merges the battery unit, fan unit, and liquid tank into a compact integrated assembly with significant horizontal overlap. By combining these components in a space-efficient arrangement where they overlap by 50% or more when viewed from above, the design achieves balance through a unified gravity center position without requiring complex separate mounting structures.
Solution Approach 2:
The patent utilizes vertical stacking combined with horizontal overlap to achieve balance while managing complexity. By arranging components in multiple dimensions with their gravity center positioned within one-third of the body unit width from the rear surface, the design maintains balance through a straightforward dimensional arrangement rather than complex mechanical balancing mechanisms.
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 configuration maintains the stability and usability of the backpack working machine by preventing the gravity center from shifting away from the user's back, even when the liquid level decreases, ensuring the machine remains balanced and easy to use.
Implementation Method 1
a battery unit (22) with a battery attaching part (84, 86) to which a battery (BP) is attached
Implementation Method 2
a fan unit (18) with a fan (44) that operates on electrical power of the battery (BP)
Implementation Method 3
when an amount of the liquid stored in the liquid tank decreases, a gravity center position of the body unit moves
Data Source
AI summary
A backpack working machine may be configured to eject liquid. The backpack working machine may include: a body unit; and a shoulder harness unit attached to the body unit and configured to be worn on shoulders of a user. The body unit may include: a battery unit comprising a battery attaching part to which a battery is attached; a fan unit comprising a fan configured to operate on electrical power of the battery; and a liquid tank configured to store the liquid. When the backpack working machine is placed on a placement surface, a direction perpendicular to the placement surface may be defined as an up-down direction. When the backpack working machine placed on the placement surface is viewed from above, 50% or more of the battery unit, 50% or more of the fan unit, and 50% or more of the liquid tank may overlap each other.