Micro Pump Pressure-Release Structure for Low-Noise Fluid Discharge
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Solution Overview
Problem
Conventional fluid transmission equipment, such as motors and valves, generate noise during pressure-releasing procedures, which is inconvenient and uncomfortable, and there is a need for a miniaturized, quiet, and efficient micro pump that can transmit large amounts of fluids while reducing noise.
Innovation Solution
A micro pump design featuring a convergence plate with a discharge outlet that creates turbulence through varying cross-sectional areas, a movable valve sheet, and a chamber plate that controls fluid flow direction, utilizing a piezoelectric actuator to minimize noise and enhance fluid transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional motors and fluid valves are used for fluid transmission, then fluid transmission function is achieved, but noise is generated during pressure-releasing procedure
Solution Approach 1:
The patent replaces conventional motors and fluid valves with a piezoelectric actuator-driven micro pump system. The piezoelectric actuator converts electrical energy to mechanical displacement, driving the valve sheet and convergence plate to control fluid flow without the noise-generating rotating components of conventional motors.
Solution Approach 2:
The patent changes the operating parameters by using a piezoelectric actuator that operates at high frequency with small amplitude movements. This fundamentally changes how fluid transmission is achieved, eliminating the noise associated with conventional motor operations while maintaining effective fluid control.
2Object-affected harmful factors
If discharge outlet cross-sectional area is varied to create turbulence for noise reduction, then noise is reduced, but fluid flow control complexity increases
Solution Approach 1:
The patent implements a dynamic discharge outlet structure where the convergence plate and valve sheet move relative to each other during operation. This dynamic configuration automatically varies the cross-sectional area of the discharge outlet, creating turbulence to reduce noise without requiring complex mechanical adjustments or multiple components.
Solution Approach 2:
The convergence plate features a curved or tapered discharge outlet geometry that gradually changes the cross-sectional area. This curved design naturally creates turbulence in the fluid flow, reducing noise while maintaining a simple, integrated structure without sharp edges or complex assemblies.
3Volume of moving object
If micro pump is miniaturized, then device size is reduced, but fluid transmission capacity may be limited
Solution Approach 1:
The patent changes the operating parameters by utilizing high-frequency actuation of the piezoelectric element, which enables the miniaturized pump to achieve high fluid transmission capacity through rapid cycling of the valve sheet and convergence plate, compensating for the smaller physical dimensions.
Solution Approach 2:
The patent employs periodic action by rapidly cycling the piezoelectric actuator, which periodically opens and closes the fluid passage. This high-frequency periodic operation allows the miniaturized pump to transmit large volumes of fluid over time, overcoming the limitation of small size through increased operational frequency.
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 micro pump effectively reduces noise during pressure-releasing procedures, allows for miniaturization, and enables the efficient transmission of large fluid volumes while maintaining low noise levels, even when driven by a piezoelectric actuator.
Implementation Method 1
Owing to that the cross-sectional area of the discharge outlet at the convergence plate first surface is different from the cross-sectional area of the discharge outlet at the convergence plate second surface, the turbulence is provided in the passageway of the discharge outlet during the pressure-releasing procedure.
Implementation Method 2
the noise generated by the micro pump driven by the piezoelectric actuator during fluid transmission is very small
Implementation Method 3
the valve sheet is a movable thin sheet, so that the pressure difference allows the valve hole to passively open or close the flowing path of the valve hole
Implementation Method 4
the fluid determine hole of the chamber plate also pushes the discharge recessed portion of the valve upwardly due to the pressure difference, so that the discharge recessed portion blocks the discharge outlet of the convergence plate to allow the fluid to flow in a single direction
Data Source
AI summary
A micro pump having noise-reduced pressure-releasing structure includes a convergence plate, a valve sheet, a chamber plate, and a micro pump. The convergence plate has a convergence outlet and a discharge outlet. The valve sheet has a valve hole and a discharge recessed portion. The chamber plate has a recessed hole, a fluid determine hole, fluid through holes, and a receiving trough. The micro pump is in the receiving trough. During operation of the micro pump, the fluid is firstly transmitted to the fluid through hole and the fluid determine hole to push the valve sheet, and the fluid determine hole pushes the discharge recessed portion to block the discharge outlet. Then, since the pressure of the fluid at the fluid through hole pushes the valve sheet, the fluid flows through the valve hole so as to be discharged out from the convergence outlet.