HORIZONTAL MICROPUMP

Fluid mechanics

Electromechanics Solid mechanics

DEFINITION – A micro-scale device used for moving liquids or gases – Pump size

PARAMETERS

•Maximum volumetric flow rate •Maximum differential pressure •Package size •Pumping frequency = max. flow rate/package size •Operating voltage •Operating frequency •Power consumption •Thermodynamic efficiency= flow rate ∗ back pressure/Power consumption

MICROPUMP OPERATION

•Actuator acts to decrease or increase pump chamber •Fluid is drawn into the pump during expansion of diaphragm •Fluid is forced out during contraction of diaphragm •The pressure and flow rate generated by a micropump depends on:

•Stroke volume •Dead volume •Pump operating frequency •Fluid properties •Valve properties

MICROPUMP OPERATION

•Stroke volume strongly depends on actuator characteristics

•Some piezoelectric actuators are modeled as displacement sources.

Displacement (stroke volume) is limited by mech. failure criterion

•Some piezoelectric actuators are modeled as pressure sources.

Stroke volume is limited by stiffness of the actuator

•Pumps are designed to operate near resonant frequency of the diaphragm to enhance performance. •Bubbles significantly affect the pump performance.

APPLICATIONS

(GENERAL)

•Feeding fuel cells with methanol or water •Mixing starch into the steam of flat irons •Medical industry •Cooling of microelectronic devices •Miniature systems in chemical and biological analysis •Space exploration •Fun gadgets

APPLICATIONS

(MEDICAL INDUSTRY)

• Drug delivery to the patients • Filling the drug packages

Requirements • Controlled drug delivery • Precise metering • Reliability • Low power consumption • Low cost

APPLICATIONS (F ILLING THE DRUG PACKAGES)

Syringe pumps

• Currently used • Intensive care is required while filling • Low precision • Large size

• Newly introduced • Compact size • Low power consumption • Attractive price • Better precision • Pumping process can be easily monitored • Passive valves (no external drive requirement)

Micro pumps

PRINCIPLE Bartels micropump mp6

Two chambers series

APPLICATIONS Bartels micropump mp6

Intrinsic actuation/sensing

COMPARISON OF CONTROL Bartels micropump mp6

OVERHEAD F ILLING

MECHANISM

(SCHEMATIC)

Drive

Belts

Motor

Object to be filled

Moveable blocks

OVERHEAD FILLING MECHANISM

Liquid to fill

OVERHEAD FILLING MECHANISM

Electronic controls Bartel micropump

mp6

Pump inlet

Pump

outlet

OVERHEAD FILLING MECHANISM

Filled object

OVERHEAD FILLING MECHANISM

MATERIAL PROPERTIES

MP6: membrane material (PSSU) characteristics

Test conditions: Hot steam at 200 C and 14 bar