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Scottoiler industrialisation. A mechatronic study of a needle valve based fluid dispensing system R émi Zante. Summary. Problem Background Research Aims Initial Results Conclusions. The Problem. Problem background RMV-Reservoir Metering Valve Temperature issues New market - PowerPoint PPT Presentation
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Scottoiler industrialisationA mechatronic study of a needle
valve based fluid dispensing system
Rémi Zante
Summary
• Problem Background
• Research Aims
• Initial Results
• Conclusions
The Problem
• Problem background– RMV-Reservoir Metering Valve– Temperature issues– New market– Controlled actuation required– Lubrication in industry
Research Aim & Objectives• Aims:
– Investigate micro-mechatronic design principals and their applications in precisions fluid system control
• Objectives – Investigate understand and model fluid flow of
RMV– Use model to develop an optimised mechatronic
oiler system.
Mec
hani
cal
Electronic &
Digital control
Fluid
LiteratureDripping ChaosDrop Dynamics
LiteratureNeedle ValvesFlow ControlDesign FactorsRMVTemperatureValve GeometryPressure HeadViscosity
Literature Design FactorsLinear Motors Solenoid ForceLinear Actuators Linear Actuation SystemControl Systems
Mechatronics
LiteratureProgrammingLabviewDesign FactorsPIC ProgramData Logger
Design FactorsSpring Settings HysteresisBacklashTolerances
Flow Analysis-Methodology
• Previous studies– Unable to predict flow rates– Quality of data– Macro approach.
• New approach– Drip timer with integrated temperature acquisition– Develop Explicative model. Inherently inaccurate
(as all models are) but good fit to compensate for outside factors
Initial Results
• Fast response of drip rate to changes in temperature.
• Drip rate more closely linked to case temperature than fluid temperature.
°C°C
Time Sec.
1/D
rip I
nter
val.
1/S
ec
Backed up by calculation:
• The coefficient of linear thermal expansion of RMV body material, Diakon is 8-12m/°Cx10-5, ie in the lowest case 0.00008mm expansion per mm per °C.
• Assuming changes of 20°C are possible. This equates to 0.01808mm expansion over 20°C.
• Equivalent to 2 positions on rotation scale.• Potentially double flow rate
Prototype build
• Build and test
• Test plot
• Shows reliability plot of mechanism
Oiler Rig System Diagram
Integrated Circuit
12V Battery
Solenoid
Reed Switch
Magnate
Reservoir
RMV
Chain
Oiler system
Duty Cycle Control
PCDAQ
Machine/Simulator
Specification
• Self contained unit
• 2L Capacity, approx. 1 Month
• 400+ Solenoid actuations
• 1 month battery life
Test Duty Cycle
Time Sec.
Tim
e S
ec.
Vo
ltag
e V
Contribution
• New understanding of gravity feed needle valve
• Not been studied in this way before
• Low cost fluid control
Next Steps
• Generate and analyse test data
• Develop fluid flow model
• Use model for linear actuator design
• Write thesis
END
Any Questions?