Positive Displacement Pump Magnetic Circuit Optimization
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Solution Overview
Problem
Existing positive-displacement pumps face inefficiencies due to air gaps in their magnetic circuits, which impede magnetic flux and reduce the pump's performance.
Innovation Solution
The pump design optimizes the magnetic circuit by using a magnetically conductive guide sleeve with through-openings, a stator, and an insulator sleeve to minimize parasitic air gaps, ensuring efficient magnetic flux transfer and guidance of the magnet armature, while a compression spring provides the restoring force, and the guide sleeve is adjustable to optimize stroke distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional magnetic circuit is used in the pump, then the structure is simple, but air gaps impede magnetic flux and reduce pump efficiency
Solution Approach 1:
The patent introduces magnetically conductive intermediaries (magnetic bridge elements, conductive guide sleeve, stator) between magnetic components to eliminate air gaps. These intermediary elements provide continuous magnetic flux paths, preventing flux interruption and improving magnetic circuit efficiency without requiring direct contact between all magnetic components.
Solution Approach 2:
The guide sleeve with integrated conductive sections is nested within the magnetic circuit structure, with the magnet armature moving inside it. This nested configuration allows the conductive guide sleeve to simultaneously serve as a structural guide and a magnetic flux conductor, eliminating air gaps between the magnet armature and surrounding magnetic components while maintaining a compact design.
2Loss of energy
If the guide sleeve is made entirely of magnetically conductive material, then magnetic flux efficiency is improved, but guidance of the magnet armature becomes difficult
Solution Approach 1:
The guide sleeve is designed with locally differentiated properties: sections made of magnetically conductive material to guide magnetic flux, and sections made of magnetically non-conductive material to provide frictionless guidance for the magnet armature. This local quality differentiation allows each section to perform its specific function optimally without compromising the other.
Solution Approach 2:
The guide sleeve is segmented into multiple sections with different magnetic properties along its length. The conductive sections are positioned where magnetic flux conduction is needed, while non-conductive sections are positioned where armature guidance is needed. This segmentation allows the single guide sleeve component to fulfill multiple functional requirements simultaneously.
3Productivity
If the stroke distance is fixed, then the structure is simple, but the pump cannot be optimized for different delivery rates
Solution Approach 1:
The pump design incorporates adjustable components that allow the stroke distance and magnetic circuit configuration to be dynamically modified. The guide sleeve can be repositioned along the piston rod, and magnetic bridge elements can be adjusted, enabling the pump to adapt its delivery rate and performance characteristics to different operational requirements without requiring multiple fixed designs.
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 enhances the magnetic flux efficiency, reduces air gaps, and allows for adjustable stroke distance, increasing the pump's delivery rate and mechanical work conversion from electrical drive energy.
Implementation Method 1
a lifting drive which has a longitudinally displaceably guided magnet armature (8) which acts on the flat side of the pump diaphragm (7) facing away from the pump chamber (6) and which can be set into a suction stroke electromagnetically against a restoring force by means of a coil (9)
Implementation Method 2
a coil of the electromagnet interacts with a magnetically conductive magnetic return element (10). On its opposite sides, this magnetic yoke element has through-openings (13, 14) which are aligned with one another and pass through a guide sleeve (15), in which the magnet armature (8) is displaceably guided
Implementation Method 3
which can be set into a suction stroke electromagnetically against a restoring force by means of a coil
Data Source
Figure 1
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AI summary
The invention relates to a positive displacement pump (1) with a pump head (3) in which (3) at least one pump chamber (6) is provided, with a pump diaphragm (7) associated with the at least one pump chamber (6), which (7) separates the pump chamber (6) from a lifting drive (see Fig. 1).