Solution Feeding Device Proportional Mixing Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing solution feeding devices, such as those using peristaltic pumps, struggle to precisely adjust the mixing rate of a standard solution with a sample solution due to the mechanical nature of tube squeezing, making it difficult to achieve precise control over the mixed quantity.
Innovation Solution
A solution feeding device comprising a mixing module with passages of varying resistance, a syringe pump, and control mechanisms that utilize flow rate detection and monitoring to precisely control the mixing of standard and sample solutions, ensuring proportional mixing and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a peristaltic pump is used to mix standard solution and sample solution, then the mixing can be performed on-line, but the mixing rate cannot be adjusted precisely
Solution Approach 1:
The device divides the mixing system into separate functional modules: a first pump for sample solution, a second pump for standard solution, and a mixing chamber. This segmentation allows independent control of each pump's flow rate, enabling precise adjustment of the mixing ratio while maintaining on-line mixing capability.
Solution Approach 2:
The system incorporates flow rate detection means that monitors the flow rates of both sample solution and standard solution, providing feedback to the control unit. The control unit adjusts the pump operations based on this feedback to maintain the desired mixing ratio, thereby achieving precise mixing rate control.
2Reliability
If additional valves are added to prevent contamination in mixing devices, then contamination can be prevented, but the device structure becomes complex
Solution Approach 1:
The invention extracts the contamination prevention function from the valve system and implements it through separate pumping systems with dedicated inlet and outlet passages. The first pump handles only sample solution while the second pump handles only standard solution, eliminating the need for complex valve arrangements to prevent cross-contamination.
Solution Approach 2:
The mixing chamber serves as an intermediary component that receives solutions from both pumps through separate passages and combines them without direct contact between the pumping systems. This mediator structure prevents contamination while maintaining system 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
The device enables precise adjustment and proportional mixing of standard and sample solutions, enhancing analytical accuracy by maintaining precise control over the mixed quantity, even with varying flow rates, and eliminating the need for additional valves to prevent contamination.
Implementation Method 1
a syringe pump communicating with the other end side of the second passage of said mixing means for sucking and discharging the standard solution
Implementation Method 2
a peristaltic pump is used. The sample solution containing the standard solution is injected into the analyzing device through a nebulizer
Implementation Method 3
mixing means including a first passage, a second passage, and a third passage for providing communications of the midways of those two passages with a higher passage resistance than those of the two passages
Data Source
AI summary
A solution feeding device for feeding a sample solution which is precisely adjusted in the mixed quantity of a standard solution is realized. The solution feeding device comprises: a mixing module (100) including a first passage (101), a second passage (102), and a third passage (103) for providing communications of the midways of those two passages with a higher passage resistance than those of the two passages; a first storage unit (10) communicating with one end side of the first passage for storing a sample solution; a suctioning nebulizer (20) communicating with the other end side of the first passage for sucking the sample solution; a second storage unit (30) communicating through an on-off valve (31) with one end side of the second passage for storing a standard solution; and a syringe pump (40) communicating with the other end side of the second passage for sucking and discharging the standard solution, respectively, in the open state and the closed state of the on-off valve.