Dispenser Pressure Sensor Integration for Precision Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispensers fail to precisely detect internal pressure in the pipette nozzle due to the remote positioning of the pressure sensor, leading to inaccuracies in liquid suction and discharge control.
Innovation Solution
Integrating a pressure sensor with its air inlet directly connected to a through hole in the syringe, allowing for precise internal pressure detection and eliminating pipeline-induced errors, while the nozzle unit is made removable for easy maintenance and the motor is kept out of contact with the frame to prevent thermal expansion errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is positioned remotely from the pipette nozzle, then the device structure is simpler and easier to manufacture, but the pressure detection precision deteriorates
Solution Approach 1:
The pressure sensor is integrated directly into the pipette nozzle assembly, merging the sensing function with the dispensing component. This eliminates the need for separate remote sensor mounting and complex pressure transmission piping, while achieving direct pressure measurement at the source for high precision detection
2Measurement precision
If a pressure transmission pipeline is used to connect the sensor to the syringe, then the sensor can be positioned remotely, but measurement errors occur due to pressure loss and thermal expansion in the pipeline
Solution Approach 1:
The harmful pressure transmission pipeline is completely removed from the system. Instead of transmitting pressure through a separate pipeline that introduces errors, the pressure sensor is positioned to measure pressure directly at the syringe interior, eliminating pressure loss and thermal expansion errors in transmission lines
Solution Approach 2:
A through-hole is created in the syringe wall to serve as a direct pressure transmission path. This simple intermediary structure allows direct pressure equalization between the syringe interior and the sensor without introducing the complex errors associated with traditional pressure transmission pipelines
3Measurement precision
If the motor is mounted in direct contact with the frame, then the structure is more compact, but thermal expansion errors affect measurement accuracy
Solution Approach 1:
The motor mounting structure is segmented into separate zones: a vibration isolation section that physically separates the motor from the measurement frame, and a transmission section that transfers only the necessary mechanical motion. This segmentation prevents thermal expansion from affecting measurements while maintaining compact overall structure
4Ease of repair
If the nozzle unit is made removable, then maintenance and replacement are easier, but the device structure becomes more complex
Solution Approach 1:
The dispensing system is segmented into a removable nozzle unit and a fixed base unit. The nozzle unit containing the pipette and tip can be independently removed and replaced, while the base unit containing the motor and control systems remains stationary. This segmentation enables easy maintenance without requiring complex disassembly procedures
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 solution enhances the precision of pressure detection, improves response to internal pressure changes, simplifies maintenance by allowing easy nozzle replacement, and prevents measurement errors from thermal expansion, enabling efficient and accurate liquid suction and discharge operations.
Implementation Method 1
a pressure sensor 134 arranged in a pressure detecting passage 180 for detecting the pressure in the pipette nozzle 132
Implementation Method 2
The pipette nozzle 132 is biased outward with respect to the frame 146 of the dispenser 131 by a spring 145
Implementation Method 3
a stepping motor 152 to be activated when fed with a driving pulse signal, so that it sucks and discharges a liquid
Data Source
AI summary
A dispenser has a pressure sensor enabled to detect a pressure precisely by forming a pressure sensor integrally with a syringe constructing a nozzle to thereby eliminate a pipeline or the like. The dispenser is provided for sucking and discharging a liquid from a nozzle by slidably moving a piston sliding in the inside of a syringe by a motor mounted in a body. A detection sensor for detecting the internal pressure of the inside of the syringe is integrally formed by connecting its air inlet directly to a through hole formed to extend to the inner face of the syringe.