Backpack Sprayer Compartment Layout for Leak-Safe Pump Control
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Solution Overview
Problem
Conventional backpack sprayers face issues with fluid leakage and complex adjustment controls, necessitating improved sealing and simplified control mechanisms to prevent electrical failure and enhance user convenience.
Innovation Solution
A battery-powered backpack sprayer design featuring a housing with a fluid container, battery compartment, and control assembly, utilizing a rotatable dial with a cam surface and follower for pump control, along with a threaded connection and drain holes to minimize leakage and simplify fluid adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional electrical backpack sprayer with integrated battery pack, electrical circuits, and liquid tank is designed, then the sprayer can be worn and carried easily, but water sealing and anti-moisture become essential to prevent electrical failure or leakage
Solution Approach 1:
The patent divides the backpack sprayer into separate compartments: a liquid tank positioned in the upper portion, a battery pack in a lower compartment, and electronic control components separated from fluid pathways. This segmentation prevents fluid leakage from affecting electrical components while maintaining wearable portability.
Solution Approach 2:
The patent introduces drain holes as intermediary features that allow accumulated fluid to drain away from electrical components. Additionally, sealed barriers and gaskets act as intermediaries between fluid-containing and electrical sections, preventing direct contact between liquid and electrical parts.
2Ease of operation
If a pressure controller on the outlet tube is used to control fluid projection speed and pressure, then the dispensing can be controlled, but the control interface becomes complex and difficult to adjust while wearing
Solution Approach 1:
The patent replaces complex mechanical pressure controllers with an electronic control system. A pump motor with variable speed control, governed by electronic sensors and a control circuit, substitutes for traditional mechanical pressure regulation mechanisms, simplifying the user interface while maintaining precise control.
Solution Approach 2:
The patent controls fluid projection by changing the operational parameters of the pump motor (speed, flow rate) through electronic regulation rather than mechanical adjustment. This allows for smooth, continuous control of dispensing characteristics without complex mechanical linkages or multiple adjustment points.
3Ease of operation
If the battery pack is mounted together with electrical circuits and liquid tank, then the sprayer can be worn on the back, but water sealing and anti-moisture measures are required to prevent electrical failure
Solution Approach 1:
The patent physically separates the battery pack into its own compartment distinct from the liquid tank and electronic control sections. This compartmentalization eliminates the need for complex water sealing between the battery and fluid systems, while the modular design maintains compact wearability.
Solution Approach 2:
The battery pack is extracted from the integrated assembly and positioned in a separate lower compartment. This extraction removes the battery from potential exposure to fluid leakage paths, eliminating the need for extensive waterproofing measures around the power source while preserving the wearable form factor.
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 effectively minimizes fluid leakage and simplifies fluid adjustment, enhancing user convenience and control, and reducing electrical failure, and fluid leakage, and simplifies the adjustment control, and reducing electrical failure.
Implementation Method 1
The rotatable dial has a cam surface engaged by a follower for controlling on and off of the pump assembly
Implementation Method 2
The dispensing assembly is in fluid communication with the pump assembly through a threaded connection, the threaded connection comprises a thread connector and a clamp mounted onto the thread connector preventing the thread connector from loosening
Implementation Method 3
The bottom face comprises one or more drain holes
Data Source
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AI summary
A backpack sprayer (100) includes a housing (101) with a bottom face (114) and a dispensing assembly (400). The housing defines a battery compartment (300) for receiving a battery (210), and a chamber (130) for receiving a control assembly (500) and a pump assembly (600). The battery compartment is positioned above the bottom face with a first height H1, and the control assembly is positioned above the bottom face with a second height H2. The control assembly includes a rotatable dial (510) which has a coupler (511) and a cam surface (512) engaged by a follower (523) for controlling on and off of the pump assembly. There is no need to provide waterproof assembly for the battery and control assemblies.