Dispensing Plunger Slots Interrupt Eddy Currents
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Solution Overview
Problem
Existing fluid dispensing apparatuses face limitations in achieving high cycle rates due to eddy currents generated within flux guide elements, which hinder the rapid dissipation of magnetic fields and thus slow down the reciprocating movement of the plunger.
Innovation Solution
Incorporating slots on the plunger, pole piece, and housing to interrupt eddy currents, allowing for quicker magnetic field decomposition and improved fluid dynamics, with axially aligned slots and additional features like grooves and angled flow channels to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flux guide elements are used to strengthen the magnetic field, then the magnetic flux is improved, but eddy currents are generated within the flux guide elements which decrease the cycle rate
Solution Approach 1:
The plunger is segmented by introducing slots that extend from the outer periphery toward the center, dividing the continuous metallic structure into separated regions. This segmentation interrupts the path of eddy currents while preserving the structural integrity and magnetic field guiding function of the plunger, thereby reducing eddy current losses and improving cycle rate
2Productivity
If the plunger moves faster to improve cycle rate, then productivity increases, but eddy currents within the plunger retard the dissipation of the magnetic field
Solution Approach 1:
Slots are introduced into the plunger structure to segment the conductive material, creating discontinuities that break eddy current paths. This reduces the energy loss from eddy currents during rapid plunger movement, enabling faster cycle rates without excessive energy dissipation
3Productivity
If slots are added to the plunger to reduce eddy currents, then cycle rate improves, but the structural integrity of the plunger may be compromised
Solution Approach 1:
The plunger is segmented by introducing slots that extend from the outer periphery toward the center, dividing the continuous metallic structure into separated regions. This segmentation interrupts the path of eddy currents while preserving the structural integrity and magnetic field guiding function of the plunger, thereby reducing eddy current losses and improving cycle rate
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
The solution significantly enhances cycle rates by reducing eddy currents and improving fluid flow characteristics, enabling faster plunger movement and shorter dispensing cycles.
Implementation Method 1
an electromagnetic coil which is part of the actuation means for moving the plunger. The armature can be moved relative to the pole piece by selectively energizing and de-energizing the electromagnetic coil
Implementation Method 2
a biasing means, preferably a return spring, forces the armature away from the pole piece. The valve stem is urged into contact with the valve seat to close the module
Implementation Method 3
During operation, eddy currents can be generated within the flux guide elements, which can decrease the cycle rate. The slot or gap within the plunger further improves the performance characteristics such as the cycle rate by avoiding eddy currents within the plunger
Data Source
AI summary
A method and an apparatus for dispensing liquid material to a substrate comprising a housing having a bore and an inlet for supplying liquid material from a material source to the bore. A nozzle communicates with the inlet and includes a discharge opening for dispensing the liquid material. A movable plunger is mounted for reciprocal movement between a closed and an open position. In the open position, liquid material is dispensed from the discharge opening and in the closed position, liquid material is prevented from being dispensed from the discharge opening. An actuator moves the plunger between the closed and the open position. The plunger has at least one slot extending from the outer periphery toward the center of the plunger.