Pulsatile Flow Device Using Air Cavity Pressure Fluctuation
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Solution Overview
Problem
Conventional water flow from taps is continuous and smooth, leading to reduced effectiveness in washing applications as most water forms a dome on the surface of the target object, reducing the ratio of water directly hitting dirt and increasing the ratio of water flowing away, with existing technologies for generating pulsatile or intermittent flow being complex and requiring many electrical elements.
Innovation Solution
A device that generates pulsatile or intermittent flow by using an injection mechanism with an air cavity and air intake ventilation hole, adjusting the ventilation amount through the hole by partially covering it with the injected flow, creating a fluctuation in air pressure to produce a pulsatile or intermittent flow with minimal electrical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous smooth water flow is used, then the flow is stable and easy to control, but most water forms a dome on the surface and flows away without effectively hitting the dirt
Solution Approach 1:
The patent applies periodic action by generating pulsatile flow instead of continuous flow. The water flow is periodically interrupted and restarted, creating pulses that impact the surface more effectively. This periodic action prevents the formation of a continuous water dome and increases the proportion of water that directly contacts and removes dirt from the surface.
2Productivity
If electrical actuators or piezo devices are used to generate pulsatile flow, then pulsatile or intermittent flow can be produced, but the system becomes complex and requires many electrical elements
Solution Approach 1:
The patent employs self-service by using the water flow itself to generate the pulsatile effect through its interaction with the cavity structure. The water flow naturally creates pressure variations and air intake fluctuations that produce the desired pulsatile pattern without requiring external electrical actuators, piezo devices, or complex control systems.
Solution Approach 2:
The patent applies pneumatics and hydraulics by utilizing the interaction between water flow and air cavity pressure. The hydraulic action of water entering and leaving the cavity creates corresponding air pressure fluctuations that generate pulsatile flow patterns, replacing the need for electrical actuation mechanisms.
3Stress or pressure
If the air intake ventilation hole is completely covered, then air pressure fluctuation increases, but air intake is blocked entirely
Solution Approach 1:
The patent applies partial action by having the water flow partially cover the air intake ventilation hole rather than completely blocking it. This partial coverage is sufficient to create the necessary air pressure fluctuations for pulsatile flow generation while still allowing some air intake to occur, maintaining the balance between pressure fluctuation and air supply.
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
The device effectively increases the ratio of water used for washing by generating pulsatile or intermittent flow, improving washing efficiency and applicability across various fields such as manufacturing, cleaning, and medical applications with a simple structure.
Implementation Method 1
the injected flow is provided for fluctuating the ventilation amount of the outer air through the air intake ventilation hole by partially covering or brushing the air intake ventilation hole with a part of the injected flow
Implementation Method 2
pulsatile flow or intermittent flow is generated from the liquid flow or gas flow from the injection mechanism to fluctuate by the blown air flow wherein the strength rhythm of the intake outer air blow is given by fluctuation of the balance between the temporarily decreasing air pressure generated in the air cavity by flowing the liquid or gas flow from the draining portion and the temporarily recovering air pressure in the air cavity by the outer air flowing via the air intake ventilation hole
Data Source
AI summary
The present invention provides a device that can generate a pulsatile flow or intermittent flow from a continuously flowing of the water tap by pressure of the water tap without using an electrical activation part. The device for generating a pulsatile fluid or intermittent fluid comprises an injection mechanism 110 for injecting fluid, which is a liquid or gas; an air cavity 120 which includes an airtight space, a draining portion 150 disposed in the lower part; an air intake ventilation hole 141 connected to the ventilation pass 140. The injection point of the injection mechanism 110 is around the air intake ventilation hole 141, and the injected flow is formed so that a part of the injected flow runs downward for covering the surface of the side wall in which the air intake ventilation hole 141 is included. The air intake ventilation hole 141 is partially covered or brushed by the running flow, so the fluctuation rhythm of the air blow is generated, wherein the temporary air pressure decrease in the air cavity 120 given by the downward flowing of the injected flow and temporary air pressure recovery in the air cavity 120 given by the air blowing form the outer air are repeatedly. Therefore, the pulsatile flow or the intermittent flow is generated.