Linear Motor Dosing Pump Stroke Element Geometry
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Solution Overview
Problem
Existing dosing pumps face challenges in high-pressure applications due to the compressibility of hydraulic fluids, leading to inefficiencies and inaccurate dosing, particularly at pressures above 400 bars, where the force transmitted by linear motors is insufficient and dead spaces in the system reduce efficiency.
Innovation Solution
The dosing pump design features a stroke element with a cross-sectional area significantly smaller than its stroke length, where the square of the stroke length is at least forty times greater than the cross-sectional area, allowing for increased pressure and reduced dead spaces, and incorporates a linear motor with a moveable element and energy storage means to enhance force transmission and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a linear motor is used to drive the displacement element in high-pressure applications, then the dosing pump can operate at higher pressures, but the compressibility of hydraulic fluid causes force loss and reduced dosing accuracy
Solution Approach 1:
The patent removes the hydraulic fluid coupling from the force transmission path between the linear motor and displacement element. By directly coupling the linear motor to the displacement element, it extracts the problematic intermediate medium (hydraulic fluid) that causes compressibility losses, thereby maintaining dosing accuracy at high pressures while eliminating the source of force loss.
Solution Approach 2:
The patent introduces a magnetic coupling mechanism as an intermediary between the linear motor and displacement element. This magnetic field-based intermediary transmits force without physical contact or hydraulic fluid, eliminating compressibility effects while enabling high-pressure operation, thus resolving the contradiction between pressure capability and dosing precision.
2Force
If a hydraulic drive system is used to transmit force from the linear motor to the displacement element, then the system can provide sufficient force, but dead spaces in the hydraulic system reduce efficiency and increase compressibility effects
Solution Approach 1:
The patent extracts and eliminates the hydraulic fluid and associated dead spaces from the force transmission system. By using direct magnetic coupling between the linear motor and displacement element, it removes the inefficient intermediate hydraulic system while maintaining adequate force transmission for high-pressure dosing applications.
Solution Approach 2:
The patent replaces the mechanical-hydraulic force transmission system with an electromagnetic field-based coupling. This substitution eliminates dead spaces and fluid compressibility, improving system efficiency while maintaining the necessary force transmission capability for driving the displacement element at high pressures.
3Force
If the stroke element has a large cross-sectional area to provide sufficient force, then the force transmission is adequate, but the dead space volume increases reducing dosing precision
Solution Approach 1:
The patent removes the stroke element's cross-sectional area constraint by eliminating the hydraulic fluid interface. The linear motor directly couples to the displacement element, extracting the problematic stroke element geometry that created dead space while maintaining force transmission capability through magnetic field coupling.
Solution Approach 2:
The patent changes the fundamental parameter of force transmission from hydraulic pressure acting on a cross-sectional area to electromagnetic force directly applied to the displacement element. This parameter change eliminates the relationship between cross-sectional area and dead space volume, allowing adequate force transmission without compromising dosing precision.
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 design enables the dosing pump to operate effectively in high-pressure environments by increasing pressure on the displacement element and reducing dead spaces, resulting in improved dosing accuracy and efficiency, even at pressures above 400 bars.
Implementation Method 1
the displacement element is coupled to a linear motor by way of a stroke element in such a way that in operation of the linear motor the stroke element performs a forward stroke and a return stroke
Data Source
AI summary
The invention concerns a dosing pump for moving a fluid, comprising a dosing head in which there is a dosing chamber and a displacement element reciprocatable between a first and a second position, wherein the displacement element delimits the dosing chamber, and the volume of the dosing chamber in the first position of the displacement element is greater than the volume of the dosing chamber in the second position of the displacement element, wherein the displacement element is coupled to a linear motor by way of a stroke element in such a way that in operation of the linear motor the stroke element performs a forward stroke and a return stroke in a housing in a direction of a movement axis with a stroke length h and the displacement element is reciprocated between the first position and the second position. To provide a dosing pump and to improve dosing pumps which are driven with a linear motor it is therefore proposed according to the invention that the stroke element has a cross-sectional area Q perpendicularly to the movement axis, wherein the square of the stroke length h is at least forty times greater than the cross-sectional area Q.