Backpack Sprayer Control Layout for Leak-Safe Pump Operation
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Solution Overview
Problem
Conventional backpack sprayers face issues with fluid leakage and complex control mechanisms, necessitating improved water sealing and simplified adjustment controls 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, including a rotatable dial and follower system 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
1Adaptability or versatility
If the battery pack, electrical circuits, and liquid tank are mounted together in a conventional backpack sprayer, then the device achieves integrated functionality, but water sealing and anti-moisture become critical challenges that may lead to electrical failure or leakage
Solution Approach 1:
The housing is divided into separate compartments: a battery compartment with a raised bottom wall that creates a fluid barrier, and a control assembly compartment positioned above the bottom face. This segmentation isolates electrical components from potential fluid leakage paths while maintaining integrated functionality.
Solution Approach 2:
A raised bottom compartment wall acts as an intermediary barrier between the fluid tank and electrical components. This structural element prevents direct contact between potential leaks and sensitive electronics, solving the water sealing challenge while preserving device integration.
2Ease of operation
If a pressure controller on the outlet tube is used to control fluid projection speed and pressure, then fluid dispensing is controllable, but the control mechanism becomes complex and difficult to adjust while wearing the backpack sprayer
Solution Approach 1:
The manual pressure controller on the outlet tube is replaced with an electronically controlled pump assembly. The pump's speed and flow rate are controlled electronically through a control assembly, eliminating the need for manual mechanical adjustment while wearing the backpack sprayer.
Solution Approach 2:
The control system adjusts pump operation parameters (speed, flow rate) electronically rather than requiring physical adjustment of mechanical components. This allows for easier control and adjustment of fluid dispensing parameters while maintaining precise control capability.
3Volume of moving object
If the battery compartment is positioned close to the bottom face for compact design, then device size is reduced, but fluid leakage can directly reach and damage electrical components
Solution Approach 1:
The raised bottom compartment wall is constructed in advance to create a protective barrier before any fluid leakage can occur. This preliminary structural design ensures that even if leakage happens during operation, the electrical components remain protected from direct contact with fluid.
Solution Approach 2:
The raised bottom wall structure provides a buffer zone or protective cushion between potential fluid leakage sources and the battery compartment. This design anticipates potential leakage scenarios and prevents damage before it can occur to electrical components.
Data Source
AI summary
A backpack sprayer is disclosed for dispensing different fluids. The backpack sprayer includes a housing with a bottom face and a dispensing assembly. The housing defines a fluid container, a battery compartment for receiving a battery, and a chamber for receiving a control assembly and a pump assembly. The dispensing assembly can dispense fluid from the fluid container. The pump assembly is configured to pump the fluid from the fluid container to the dispensing assembly. The control assembly is configured to control the pump assembly. The battery compartment is positioned above the bottom face with a first height therebetween, and the control assembly is positioned above the bottom face with a second height therebetween. The control assembly includes a rotatable dial, and the rotatable dial has a coupler for coupling a rotatory movement and a cam surface engaged by a follower for controlling on and off of the pump assembly.