Air Duster Valve Profile for Proportional Flow Output
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Solution Overview
Problem
Existing air duster structures face operability issues due to a decrease in air flow output as the operation button is pressed further, resulting in a small change in air jetted out, despite increased operation, due to a proportional relationship between air flow and pressure difference across the throttle valve.
Innovation Solution
An air duster structure with a flow amount adjustment mechanism that includes a pipe line and a movable valve member with a throttle portion, where the flow channel area increases at an accelerated rate as the valve member opens, maintaining a proportional relationship between operation amount and air flow output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flow channel area is increased to maintain proportional relationship between operation amount and air flow output, then the operability is improved, but the pressure difference across the throttle valve decreases
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the flow channel, specifically transitioning from a linearly tapered shape to a curved profile where the flow channel area increases at an accelerated rate. This changes the relationship between valve member displacement and flow area, allowing the system to compensate for pressure differential changes and maintain proportional control between operation amount and air flow output.
2Quantity of substance
If the operation button is pressed further to increase air flow output, then the operation amount increases, but the air flow output does not largely change due to pressure decrease
Solution Approach 1:
The patent applies dynamics by creating a non-linear, accelerated expansion profile for the flow channel. Instead of a static linear taper, the dynamic relationship between valve member position and flow area is optimized so that as the valve opens, the flow area increases at an accelerated rate. This dynamic geometric change compensates for the decreasing pressure differential, ensuring that increased operation amount continuously produces proportional increases in air flow output.
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 ensures that the air flow output remains consistent and proportional to the operation amount, even when the pressure difference decreases, enhancing operability by compensating pressure changes with increased flow channel area.
Implementation Method 1
the difference in the pressure between in front of and behind the throttle of the release valve becomes small
Implementation Method 2
a throttle portion configured to gradually change an area of a flow channel in which air circulates, with a movement of the valve member
Data Source
AI summary
An air duster structure that is configured to jet compressed air out of a nozzle, includes a flow amount adjustment mechanism which is configured to adjust an amount of air jetted out of the nozzle. The flow amount adjustment mechanism includes: a pipe line for circulating air; a valve member disposed inside the pipe line and being movable; and a throttle portion configured to gradually change an area of a flow channel in which air circulates, with a movement of the valve member, to control a flow amount of the air in the pipe line. The throttle portion is structured so as to increase the area of the flow channel at an accelerated rate when the valve member moves in a direction that opens the pipe line.