Asymmetric Metering Device Separating Element Pressure Control
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Solution Overview
Problem
Existing metering devices for medical instruments face challenges in accurately metering small quantities of medium under varying pressures, particularly with compressible media, leading to inconsistent disinfection and maintenance outcomes.
Innovation Solution
A metering device with a movable separating element and distinct contact faces in the metering container allows for a difference force proportional to the equilibrium pressure, enabling precise control and self-regulation of medium discharge without additional pumps or pressure generators, maintaining constant pressure and quantity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a pressurized medium container is coupled to a metering container, then medium can be supplied to the metering container, but the pressure decreases with the number of removal cycles making constant metering difficult
Solution Approach 1:
The patent implements a feedback mechanism where the actual pressure in the medium container is measured by a pressure sensor and this information is fed back to the control unit. The control unit calculates the required filling pressure based on the current pressure and the desired metered quantity, then adjusts the filling process accordingly. This closed-loop control compensates for pressure decreases during multiple removal cycles, ensuring constant metering accuracy.
Solution Approach 2:
The system dynamically changes the filling pressure parameter based on the current state of the medium container. By calculating the required filling pressure as a function of the current pressure and adjusting it accordingly, the system maintains constant metering performance despite varying operating conditions and pressure changes during operation.
2Measurement precision
If additional pumps or pressure generators are added to maintain constant pressure, then metering precision improves, but device complexity increases
Solution Approach 1:
The system uses the existing medium container and its inherent pressure characteristics to perform the metering function. By calculating and controlling the filling pressure based on current pressure measurements, the system achieves precise metering without requiring additional pumps or pressure generators. The control unit and pressure sensor work with the existing components to maintain precision.
Solution Approach 2:
The patent replaces mechanical pressure regulation mechanisms (such as additional pumps or pressure generators) with a computational approach. The control unit calculates the required filling pressure and uses electronic control to achieve the desired metering precision, substituting complex mechanical systems with a simpler sensor-controlled filling process.
3Ease of operation
If the separating element has equal contact face areas, then the structure is simpler, but control without pressure difference is not possible
Solution Approach 1:
The separating element is designed with asymmetric contact face areas, where the first contact face has a different area than the second contact face. This asymmetry creates a pressure difference force that enables control of the separating element's position and the metering process without requiring external pressure differences between media. The different areas allow the element to be controlled through pressure equalization while maintaining operational control.
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 operational reliability and precision in metering, reduces the complexity of the metering process, and compensates for pressure fluctuations, ensuring consistent delivery of medium quantities for medical instrument maintenance.
Implementation Method 1
at the equilibrium pressure that acts identically on boundary surfaces of the first and second regions, the separating element experiences a force effect that is proportional or inversely proportional to the equilibrium pressure
Data Source
AI summary
A metering device removes a medium from a pressurized medium container. The metering device includes a metering container which is designed to measure off a quantity of the medium and which has a first region and a second region. The first region is separated from the second region by a movable separating element. The separating element has a first contact face, which is directed towards the first region and delimits or closes off the first region. The separating element also has a second contact face, which is directed toward the second region and delimits or closes off the second region. The first contact face and the second contact face have different surface dimensions.