Liquid Dispensing Apparatus with Dual Pneumatic Valves
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Solution Overview
Problem
Existing liquid dispensers face challenges in accurately dispensing viscous or paste-like liquids due to variations in syringe inner volume, conduit diameter, and compressed pressure, leading to inconsistent dispensing and reduced accuracy, as they rely on manual pressure adjustments and limited pneumatic pressure measurements.
Innovation Solution
A liquid dispensing apparatus with a syringe connected to multiple pneumatic paths, including a positive pressure passage, vacuum passage, and exhaust passage, controlled by pressure and vacuum valves, and a single pressure sensor to measure and regulate pressure in real-time, allowing simultaneous pressurization and release, and enabling online pressure adjustments and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single valve is used to either pressurize or release air from the syringe, then the device structure is simple, but pressurization and release cannot be conducted simultaneously which slows down liquid dispensation and reduces real-time pressure control accuracy
Solution Approach 1:
The single valve is segmented into two separate valves: a first valve for pressurizing the syringe and a second valve for releasing air. This allows simultaneous or independent operation of pressurization and release functions, eliminating the sequential delay inherent in single-valve systems and enabling faster liquid dispensation cycles.
Solution Approach 2:
The system transitions from a static single-valve configuration to a dynamic dual-valve configuration where both valves can be controlled independently and simultaneously. This dynamic control enables real-time adjustment of syringe pressure with both pressurization and release occurring concurrently when needed, improving dispensation speed and pressure control accuracy.
2Device complexity
If only two pressure sensors are used to measure source pressure and syringe pressure, then the measurement system is simple, but real-time control and online pressure adjustments cannot be effectively implemented
Solution Approach 1:
The system implements feedback control by using multiple pressure sensors to continuously monitor source pressure, syringe pressure, and exhaust pressure. This multi-point feedback enables real-time detection of pressure variations and allows the controller to dynamically adjust valve operations to maintain precise pressure control, overcoming the limitations of only two measurement points.
Solution Approach 2:
The pressure measurement system is expanded from a specialized two-sensor configuration to a universal multi-sensor system that can measure pressure at multiple critical locations simultaneously. This multi-functional measurement capability provides comprehensive pressure data for both control and diagnostic purposes, enabling more accurate real-time pressure control.
3Device complexity
If manual pressure adjustment is used, then the device structure is simple, but idle time increases and operation time is lengthened
Solution Approach 1:
The system transitions from manual pressure adjustment to automated self-regulating pressure control. The controller automatically monitors pressure sensor readings and adjusts the valves accordingly without requiring manual intervention. This self-service capability eliminates idle time associated with manual adjustments and enables continuous operation, significantly reducing total operation time.
Solution Approach 2:
Manual mechanical pressure adjustment is replaced with an automated electronic control system that uses pressure sensors and electronic valves. This substitution eliminates the need for manual operation, removes associated idle time, and enables precise, rapid pressure adjustments that improve overall system efficiency and reduce operation time.
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 setup enables precise and consistent dispensing of liquids by real-time control of syringe pressure, reducing idling time, and improving accuracy by allowing simultaneous valve operations and online pressure measurements, compensating for variations in liquid level and syringe pressure.
Implementation Method 1
a pressure sensor which is operative to measure the pressure in the connector passage
Implementation Method 2
a positive pressure passage which is connected to an air source for supplying positive pressure to the syringe
Implementation Method 3
a vacuum passage which is connected to a vacuum generator for supplying vacuum pressure to the syringe
Implementation Method 4
a pressure valve located along the positive pressure passage that is operative to control the flow of air along the positive pressure passage
Implementation Method 5
a vacuum valve located along the vacuum passage that is operative to control the flow of air along the vacuum passage
Data Source
AI summary
A liquid dispensing apparatus is provided which has a syringe for storing and dispensing a liquid, and a connector passage connected to the syringe. A positive pressure passage is connected to an air source for supplying positive pressure to the syringe, and there is a pressure valve located along the positive pressure passage that is operative to control the flow of air along the positive pressure passage. A vacuum passage is connected to a vacuum generator for supplying vacuum pressure to the syringe, and there is a vacuum valve located along the vacuum passage that is operative to control the flow of air along the vacuum passage. The positive pressure passage and vacuum passage are connected to the connector passage. A pressure sensor is also provided to measure the pressure in the connector passage.