Analytical Device Pump Segmentation for Dosing Precision
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Solution Overview
Problem
Existing analytical devices for determining digestion parameters in liquid samples, such as chemical oxygen demand, face limitations in sample transportation due to long hose lengths, leading to restricted sucking distance and height, increased time consumption, and mechanical wear on piston pumps.
Innovation Solution
The analytical device employs a peristaltic pump for sample transportation, combined with a piston pump for precise dosing, and a photometric sensor for measuring chemical changes, allowing for continuous and accurate sample handling and parameter determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a piston pump is used for sample transportation, then dosing precision is improved, but sucking distance and height are restricted due to long hose lengths
Solution Approach 1:
The pump system is segmented into two distinct pumps: a peristaltic pump for sample transportation and a piston pump for precise dosing. This segmentation allows each pump to be optimized for its specific function, with the peristaltic pump handling long-distance transportation and the piston pump providing precise metering
Solution Approach 2:
A metering container is introduced as an intermediary element between the peristaltic pump and the piston pump. The peristaltic pump fills the metering container, and then the piston pump meters the liquid from the container, allowing the system to overcome the limitations of both pump types
2Manufacturing precision
If a piston pump is used for sample transportation, then dosing precision is improved, but time consumption increases due to slow pumping speed
Solution Approach 1:
The pumping function is divided between two pumps with different speed characteristics. The peristaltic pump provides fast transportation to fill the metering container quickly, while the piston pump provides slow, precise dosing from the container, thus achieving both high speed and high precision
Solution Approach 2:
The peristaltic pump performs preliminary action by quickly filling the metering container with the required volume of liquid before the precise dosing operation begins. This preliminary fast filling reduces the overall time consumption while maintaining dosing precision
3Manufacturing precision
If a piston pump is used for sample transportation, then dosing precision is improved, but mechanical wear increases due to higher negative pressure
Solution Approach 1:
The system segments the pumping tasks to protect the piston pump. The peristaltic pump handles the demanding transportation task with long hoses and varying pressures, while the piston pump operates in the more favorable conditions of metering from a container, reducing mechanical wear and increasing reliability
Solution Approach 2:
The metering container acts as a buffer that decouples the peristaltic pump from the piston pump. This intermediary allows the piston pump to operate without experiencing the high negative pressures and mechanical stresses associated with long hose transportation, thereby reducing wear
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 increased suction velocities, improved dosing accuracy, and reduced mechanical stress, overcoming the limitations of piston pumps by allowing higher transport volumes and precise metering, while maintaining efficient chemical oxygen demand determination.
Implementation Method 1
The analytical device employs a peristaltic pump for sample transportation
Implementation Method 2
a photometric sensor for measuring chemical changes
Implementation Method 3
combined with a piston pump for precise dosing
Data Source
AI summary
An analytical device for determining a parameter of a liquid sample, especially a digestion parameter, such as chemical oxygen demand, total carbon content or total nitrogen content, comprising a reactor, and measuring system for ascertaining the parameter of the liquid sample. A container system for storing samples, reagents and waste products in containers, a transport and dosing system for metering and transporting the sample and reagents from the containers into a metering container and for disposal of waste products from the metering container into a waste container, and a measuring transducer for registering a measured parameter correlating, measured value of the liquid sample mixed in the reactor, and measuring, system, in given cases, with one or more reagents is provided. The transport and dosing system is embodied at least of a metering container, a piston pump and an additional sample taking apparatus at least for removal from a sample taking location of a predetermined volume of a liquid as a liquid sample.