Dual Plunger Fluid Pump for Microdosing Reliability
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Solution Overview
Problem
Conventional reciprocating fluid pumps face durability and reliability issues when pumping small amounts of fluid due to the use of small diaphragms, which often fail during operation.
Innovation Solution
The design incorporates two plungers with different cross-sectional dimensions, where a larger plunger is structurally connected to a smaller one, allowing for efficient pumping of small fluid amounts while maintaining durability and reliability by utilizing relatively large plungers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If small diaphragms are used to pump small amounts of fluid, then the pump can achieve microdosing capability, but the reliability and durability deteriorate due to frequent diaphragm failure
Solution Approach 1:
The pump is divided into two separate pumping chambers, each with its own plunger and diaphragm. This segmentation allows one chamber to be active while the other is inactive or being replaced, enabling microdosing with larger, more reliable diaphragms rather than requiring a single small diaphragm to handle all pumping demands.
Solution Approach 2:
The second plunger and its bellows are positioned within the first plunger's bellows, creating a nested configuration. This allows the smaller second plunger to operate within the larger first plunger's space, enabling dual-chamber functionality while maintaining a compact structure suitable for microdosing applications.
2Productivity
If a single plunger design is used, then the device complexity is low, but the productivity is insufficient for effective microdosing
Solution Approach 1:
The patent combines two plungers with different cross-sectional dimensions into a single integrated assembly where the second plunger is positioned within the first plunger's bellows. This merging approach achieves enhanced productivity through dual-chamber operation while maintaining relatively simple structural integration, avoiding the need for completely separate pump units.
Solution Approach 2:
The system employs dynamic operation where the first and second plungers can operate in alternating or coordinated cycles. The bellows are configured to expand and contract sequentially, enabling flexible pumping patterns that optimize productivity for microdosing applications while maintaining mechanical simplicity.
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 configuration enables effective microdosing while increasing the durability and reliability of the pump by allowing small amounts of fluid to be pumped using larger plungers, reducing the likelihood of diaphragm failure.
Implementation Method 1
the first plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body
Implementation Method 2
the second plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body
Data Source
AI summary
A reciprocating fluid pump includes a pump body, a subject fluid chamber, a first plunger located within the subject fluid chamber of the pump body and having a first head portion and a first bellows, the first plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body, wherein the first head portion and the first bellows have a first cross-sectional dimension, and a second plunger located within the subject fluid chamber of the pump body and having a second head portion and a second bellows, the second plunger configured to expand and compress in a reciprocating action to pump the subject fluid through the subject fluid chamber within the pump body, wherein the second head portion and the second bellows have a second cross-sectional dimension that is smaller than the first cross-sectional dimension.