Top 9 Micro Annular Gear Pump The 207 Detailed Answer

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Michael Smith Engineers Ltd – MZR touch control for HNPM micro-annular gear pumps
Michael Smith Engineers Ltd – MZR touch control for HNPM micro-annular gear pumps


Useful information on Micro Annular Gear Pumps

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  • Summary of article content: Articles about Useful information on Micro Annular Gear Pumps A micro annular pump (also called a gerotor or trocho pump) is a type of internal gear pump. It consists of inner and outer gears assembled eccentrically … …
  • Most searched keywords: Whether you are looking for Useful information on Micro Annular Gear Pumps A micro annular pump (also called a gerotor or trocho pump) is a type of internal gear pump. It consists of inner and outer gears assembled eccentrically … Information on micro annular gear pumps including how micro annular gear pumps work
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Useful information on Micro Annular Gear Pumps
Useful information on Micro Annular Gear Pumps

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Micro annular gear pump

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  • Summary of article content: Articles about Micro annular gear pump Micro annular gear pumps for flu delivery are an excellent example. Their simple, no-valve design allows them to come in a compact size with a virtually … …
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Micro annular gear pump
Micro annular gear pump

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Micro annular gear pumps – HNP Mikrosysteme

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  • Summary of article content: Articles about Micro annular gear pumps – HNP Mikrosysteme The micro annular gear pump product range consists of five different series of mzr®-pumps for dosing and metering small amounts of low to high viscous liqus. …
  • Most searched keywords: Whether you are looking for Micro annular gear pumps – HNP Mikrosysteme The micro annular gear pump product range consists of five different series of mzr®-pumps for dosing and metering small amounts of low to high viscous liqus. Find at HNPM a suitable micropump for dosing and metering small amounts of low to high viscous liquids.
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Micro annular gear pumps - HNP Mikrosysteme
Micro annular gear pumps – HNP Mikrosysteme

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Micropump Micro-Annular Gear Pumps – Cole-Parmer

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  • Summary of article content: Articles about Micropump Micro-Annular Gear Pumps – Cole-Parmer Micro-annular gear pumps are rotary pumps that are constructed with an externally toothed internal rotor as well as with an annular tooth external rotor, … …
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Micropump Micro-Annular Gear Pumps - Cole-Parmer
Micropump Micro-Annular Gear Pumps – Cole-Parmer

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mzr-2921X1 Micro Annular Gear Pump with Controller– Darwin Microfluidics

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  • Summary of article content: Articles about mzr-2921X1 Micro Annular Gear Pump with Controller– Darwin Microfluidics Micro annular gear pumps generate a near pulsation-free and accurate flow rate down to a few µL/min. The low pressure series … …
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mzr-2921X1 Micro Annular Gear Pump with Controller– Darwin Microfluidics
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Micro Annular Gear Pumps – Harton Anlagentechnik GmbH

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  • Summary of article content: Articles about Micro Annular Gear Pumps – Harton Anlagentechnik GmbH Micro annular gear pumps are miniaturized rotary positive displacement pumps. They are based on the so-called micro annular gear principle with an … …
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Micro Annular Gear Pumps - Harton Anlagentechnik GmbH
Micro Annular Gear Pumps – Harton Anlagentechnik GmbH

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micro annular gear pump

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Useful information on Micro Annular Gear Pumps

Useful information on Micro Annular Gear Pumps

What is a micro annular gear pump?

A micro annular gear pump is a type of positive displacement (PD) pump. Gear pumps use the actions of rotating cogs or gears to transfer liquids. There are two basic designs: external and internal (Figure 1). An external gear pump consists of two identical, interlocking gears supported by separate shafts. An internal gear pump operates on the same principle but the two interlocking gears are of different sizes with one rotating inside the other. The larger gear (the rotor) is an internal gear i.e. it has the teeth projecting on the inside. Within this is a smaller external gear (the idler – only the rotor is driven) mounted off-centre and held in place by a crescent-shaped partition or spacer.

Micro annular gear pumps (also called gerotors or trochoid pumps) are a type of internal gear pump. The inner and outer gears are assembled eccentrically within the pump casing without a spacer. Generally, the number of teeth on the driven inner gear is one less than that of the idling outer gear. Since the number of teeth and the centre for each gear are different, the volume of the gap between the inner and the outer rotors changes throughout a cycle. The pump inlet is positioned where the gap begins to widen and this generates suction. The pump outlet is positioned on the opposite side of the casing where the gap between the gears closes.

How does a micro annular gear pump work?

The inner gear is off-centre with a trochoidal profile and the outer gear is machined with matching, intersecting circular arcs. The gears mesh precisely at only one point in their rotation but the teeth of the inner gear are always in contact with the outer gear. This partitions the internal void between them into dynamically-changing volumes. Close tolerances between the gears, bearings and case allow the pump to develop suction at the inlet and prevent liquid from leaking back from the discharge side.

There are four stages in a micro annular gear pump’s working cycle: filling, transfer, compression and delivery. The progress of fluid as it passes through this cycle is shown in Figure 2.

As the gears come out of mesh on the inlet side of the pump, an expanding volume is created in the void between the two gears. Liquid flows into the void from the inlet port and is trapped by the gear teeth as the gears continue to rotate. The trapped liquid is moved around the casing and transferred from the inlet side of the pump … … across to the outlet side. As the gears become interlocked on the discharge side of the pump, the fluid is compressed … … and discharged under pressure. The inner, external gear has completed a full cycle and has now advanced one place around the teeth of the outer, internal gear.

For continuous dosing applications, the pump is operated by turning the pump shaft at a constant speed. For dispensing and precise dosage, the pump shaft is turned incrementally to serve up the required number of pulses.

What are the main features and benefits of a micro annular gear pump?

Micro annular pumps are compact, perhaps only a few centimetres long, and simple with only a few moving parts. They offer a smooth and adjustable flow proportional to the rotational speed of its gears. This makes them ideal for applications requiring accurate delivery or metering. For continuous delivery, micro annular pumps can provide accurate flow rates (from 1µl/h to 1 l/m) with a differential pressure up to 200 bar. For metering applications, a micro annular pump can provide accurate and reproducible doses as low as 2 µl with a precision of 1% or greater.

In continuous delivery, pulsation is low compared with other types of positive displacement pumps and is a function of the number of gear teeth. So, for example, a pump consisting of inner and outer gears with 6 and 7 teeth respectively may produce a flow pulsation of 6%. The same pump design with gears of 10/11 teeth will produce a smoother flow with pulsation of perhaps only 1.5%.

Micro annular pumps can be hermetically sealed and driven by means of powerful magnetic drives, eliminating leaks on the drive end. The gears and wetted parts can be constructed of nickel-based carbides, stainless steel, ceramics based on aluminium oxide, zirconium oxide or silicon carbide, and plastics such as PTFE, PEEK and FKM so the pumps are suitable for use with corrosive substances. Micro annular pumps can be fitted with Ex approved drives for use in hazardous environments.

Frictional wear and pump noise is small because the relative speed of the gears is low (the number of teeth on the inner rotor is only one less than that of the outer rotor). This minimises shearing forces making them suitable pumps for shear-sensitive liquids such as paint and soaps.

What are the limitations of a micro annular gear pump?

The close tolerances between the gears (typically only about 2µm) mean that micro annular pumps are susceptible to wear particularly when used with abrasive liquids or feeds containing entrained solids. Pumps should always have a filter installed on the suction side for protection from large, potentially damaging, solids.

For high temperature applications, it is important to ensure that the operating temperature range is compatible with the pump specification. Thermal expansion of the casing and gears reduces clearances within a pump and this can also lead to increased wear, and in extreme cases, pump failure.

Despite the best precautions, all gear pumps eventually succumb to wear of the gears, casing and bearings. In a micro annular pump, wear, and consequently leakages, can occur around the gear teeth, across the face of the gears and around the bearings. As these clearances increase, there is a gradual reduction in efficiency and increase in flow slip: leakage of the pumped liquid from the discharge back to the suction side. Flow slip is proportional to the cube of clearances within a pump so internal wear can have a significant effect until a critical point is reached, from which performance degrades rapidly.

Micro annular pumps continue to pump against a back pressure and, if subjected to a downstream blockage will continue to pressurise the system until the pump, pipework or other equipment fails. It is always advisable to fit relief valves in the system to protect downstream equipment.

Cavitation can occur under some conditions, particularly if the inlet tubing or upstream filter restricts flow, and this can affect dosing or flow accuracy as well as potentially damaging the pump and associated equipment.

Generally, a micro annular pump relies on the pumped liquid for lubrication and should not be run dry. It is therefore necessary to prime the pump before operation and to ensure a continuous supply of liquid.

What are the main applications for micro annular gear pumps?

Micro annular pumps are used for the continuous delivery and discrete dosage of water, watery solutions, solvents, methanol, oil, lubricants, adhesives, inks and paints as well as other high viscosity liquids. The pumps suit applications requiring the targeted dosing of small volumes of liquid, for example: the transfer of crystallizing, air-sensitive or outgassing media, fuel cell technology, the delivery of urea solution (AdBlue) to remove NOx from diesel engine exhaust gas, or dialysis and analysis technologies.

Micro annular pumps are available for liquids with viscosities between 0.2 and 1,000,000 mPa and a differential pressure range of 0 to 200 bar. They offer flow rates from 1µl/h to 1 l/min or dosages as low as 2µl at up to 100 per minute with 1% precision.

Typical applications include:

Chemical processing

Industrial and plant engineering

Packaging

Medical and pharmaceutical industry

Mini plant technology

Spraying

Dispensing of adhesives

Ink and paint dosage

Vacuum applications

Summary

A micro annular pump (also called a gerotor or trochoid pump) is a type of internal gear pump. It consists of inner and outer gears assembled eccentrically within the pump casing. When the inner gear turns, it rotates the outer gear in the same direction. Since the number of teeth and the centre for each gear are different, the volume of the gaps between the two gears changes throughout a cycle. Close tolerances between the gears allow the pump to develop suction at the inlet and prevent liquid from leaking back from the discharge side.

Micro annular pumps are small and compact. The pumps offer a smooth and adjustable flow which is proportional to the rotational speed of its gears. In addition, incremental rotation of the gears allows precise dosing.

Micro annular gear pump

The pump is ­driven by an electronically commutated DC motor with integrated speed ­controller. The brushless design enhances the ­service life and reliability of the drive. Motor-adapted variable speed control is ­guaranteed by a speed controller that has the same diameter as the motor and is mounted to the rear of the motor. This means that the user can easily adjust the speed via an analog input with 0 – 10 V. A digital input determines the direction of rotation. For additional monitoring functions, the digital frequency output provides a 15-mA output signal with six pulses per revolution. The drive supply voltage is 12 or 24 V DC, while the 22 mm motors achieve around 9 W and feature a torque of up to 59.9 Nm. Supply voltage to the speed controller is 5 to 28 V DC via a separate flat ribbon cable. The motor efficiency of around 68%, as well as the more than 95% efficiency of the control electronics, allow for long operating times even in battery-backed mobile devices. The rugged stainless steel enclosure and wide temperature range of –40°C to +85°C ­enable the device to also be used outdoors, e.g. for environmental measurements. The short-term overload capability of the microdrives supports such applications, as this allows increased pump breakaway torques, e.g. after overnight temperature drops, and the resulting higher fluid viscosity, to be mastered with ease.

Micro annular gear pumps

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