Micro-fluid Pump Distribution Wall and Diaphragm Design
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Solution Overview
Problem
Micro-fluid pumps face challenges in achieving precise flow control and stability due to issues like over-expansion of components, poor sealing, and vibration-induced fluid leakage, which affect discharge accuracy and noise levels.
Innovation Solution
A micro-fluid pump design featuring a pump cover with distribution walls that extend partially towards a partition, a diaphragm assembly with compressible units, and one-way valves with knife grain surfaces to enhance structural strength, reduce vibration, and improve sealing and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pump cover is manufactured by injection molding, then the manufacturing cost is reduced and production efficiency is improved, but the pump cover is easily deformed under fluid pressure pulses causing fluid leakage
Solution Approach 1:
The pump cover is divided into multiple independent components: the cover body, distribution walls, and reinforcement ribs are designed as separate structural elements that can be independently molded and assembled. This segmentation allows each part to be optimized for its specific function while maintaining manufacturing efficiency through standardized injection molding processes.
Solution Approach 2:
Different regions of the pump cover are designed with locally optimized properties: the cover body uses standard injection molding for efficiency, while strategic reinforcement ribs and thickened wall sections are added in high-stress areas to prevent deformation. The distribution walls have varying thicknesses tailored to local pressure requirements, ensuring sealing performance without over-engineering the entire structure.
2Productivity
If the diaphragm pump is subjected to continuous fluid pressure pulses, then the pumping function is achieved, but vibrations are generated causing potential fluid leakage
Solution Approach 1:
The diaphragm's natural vibration and expansion under fluid pressure pulses is converted into a beneficial pumping mechanism. The elastic deformation of the diaphragm during pressure cycles creates the necessary fluid displacement and pressure generation, transforming what could be harmful vibration into the core pumping action that drives fluid flow through the system.
Solution Approach 2:
The pump cover incorporates reinforcement ribs and thickened wall sections in advance of high-stress areas to cushion against deformation from pressure pulses. These pre-designed structural features absorb and distribute the mechanical stress before it can propagate through the entire cover, reducing vibration transmission and preventing leakage paths.
3Productivity
If the water capsule expands excessively, then the pumping capacity is increased, but interference between components occurs
Solution Approach 1:
The diaphragm's expansion parameters are precisely controlled through material selection and geometric design. The diaphragm thickness, radius of curvature, and elastic modulus are optimized to achieve the desired pumping capacity while limiting maximum expansion to prevent contact with surrounding components. Pressure relief features and clearance designs are incorporated to accommodate expansion without causing interference.
4Ease of operation
If the valve is designed to open easily under fluid action, then the opening responsiveness is improved, but sealing performance may deteriorate
Solution Approach 1:
The valve design incorporates dynamic characteristics that adapt to operating conditions. The valve flap or disc is designed with optimal thickness and material properties to provide quick opening response when fluid pressure exceeds the closing force, while the sealing surface and spring preload ensure reliable closure when pressure differential reverses. The valve geometry creates a balance between opening force and sealing force that responds dynamically to pressure changes.
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 design achieves precise flow control, reduced noise, and enhanced structural strength, ensuring high discharge accuracy and stability while minimizing fluid leakage and vibration.
Implementation Method 1
a diaphragm assembly with compressible units
Implementation Method 2
compressible units
Implementation Method 3
distribution wall which is disposed in the inlet cavity and extends at least partially toward the partition portion
Implementation Method 4
one-way valves with knife grain surfaces to enhance structural strength, reduce vibration, and improve sealing and responsiveness
Implementation Method 5
enhance structural strength, reduce vibration
Data Source
AI summary
Embodiments of the disclosure provide a micro-fluid pump having a pump cover with a distribution wall, a one-way valve having a spark surface, and a micro-fluid pump including such a one-way valve as well as a micro fluid pump including a diaphragm deformation control structure. The pump having the pump cover with the distribution wall includes a pump body. The pump cover overlies the pump body to form at least a portion of the inlet passage and at least a portion of the discharge passage, and includes an inlet cavity for containing fluid entering the micro-fluid pump from the outside and a discharge cavity for containing fluid to be discharged from the micro-fluid pump, which cavities are separated by an isolation portion. The pump cover has on its bottom surface a distribution wall which is disposed in the inlet cavity and extends at least partially toward the partition portion.