The operating principle of a ViscoTec progressive cavity pump (endless piston principle)

Описание: This animation shows how a progressive cavity pump ("endless piston principle") works.

Low- to high-viscosity liquids and pastes can be perfectly metered and filled with this technology.

Dosing pumps with endless piston principle belong to the group of rotating displacement pumps. The principle of operation is comparable to an endless piston, which conveys the product from the suction end to the discharge end, thus building up a pressure difference.

At the heart of every application is a volumetric dosing system. The interaction of a rotor with eccentric motion and a stator adapted to the conditions of the application results in conveying and dosing characteristics which correspond to an endless-motion piston.

Due to the dosing geometry, a constant volume is always conveyed proportionally to the angle of rotation per revolution. The conveying direction can be reversed by changing the direction of rotation. The volume is therefore unambiguously defined via the angular degrees.

Our technology provides a pressure-stable, linear head capacity curve of the pump. This enables a clear statement to be made regarding the ratio of revolution, time and discharge rate. So the pumps can be used in an application to dose a constant volume based on either time or revolutions. This fact results in a reliable dosing precision at the pump outlet of 1% (depending on the medium), which is often undercut in practice.

Another benefit is the conveying chamber produced, whose volume remains absolutely constant throughout the motion. As a result of this, solids-based media and even lumpy products can be conveyed and delivered.

Our pump technology provides additional benefits compared to other conveying mechanisms. For example, in over 95% of all applications there is no need for any filling and dosage valves at all, since a short reverse motion at the end of the dosing process causes threads to be broken off or prevents dripping.

Precise dispensing due to the endless piston principle

ViscoTec dispenser are based on a completely pressure-tight displacement system, which is self-sealing and consists of a rotor and stator. The controlled rotary motion of the rotor causes the medium to be displaced in the stator and generates the conveying movement.

Since conveying can also take place in reverse, ViscoTec ensures that the material or medium is broken off cleanly and in a controlled manner without dripping. Our micro-dispensers enable micro doses from 1 µl to be administered with a high degree of process security and a dosing precision of ± 1%, plus a repeat accuracy of more than 99%.

More information: https://www.viscotec.de/en/technology...

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