Axial pump
An axial pump is a pump that delivers fluids with a rotary movement axially , that is, parallel to the pump shaft. Together with the radial pump , which does this with a radial flow, it belongs to the centrifugal pumps . It has a similar structure to a stage of an axial compressor as used in gas turbines .
Because the fluid is not conveyed in a closed volume (as with a piston pump ) , but rather through pressure differences due to the movement, the axial pump is a flow pump and belongs to the flow machines .
In contrast to radial pumps, the operating principle of an axial pump does not require a diversion of the delivery flow.
The axial pump consists of a tubular pump housing in which the propeller-like pump rotor (impeller) rotates. The stationary guide wheel is located behind the rotor in the direction of flow. Axial pumps are used when gentle pumping is important. Large pumps are usually driven by a pod around which the fluid flows and in which the motor and gear are located. A wave inserted through a pipe bend is also common (see picture). Axial pumps can also be driven purely magnetically from the outside; for this purpose, the ring-shaped rotor of an electric motor, for example a three-phase motor squirrel-cage rotor, is attached to the pump blades . The stator of the motor is located around the tubular pump housing. This makes the motor hermetically sealed and suitable for conveying aggressive or dangerous goods. The rotor can also be mounted magnetically.
Small micro-axial pumps are used as blood pumps for cardiac support .
Individual evidence
- ↑ https://link.springer.com/chapter/10.1007/978-3-8351-9035-1_5 fluid flow machines, chapter 5. Centrifugal pumps, Teubner Verlag 2006, page 193
- ↑ Abiomed Impella 2.5 Handbook of a blood pump ( Memento of the original from September 7, 2011 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. (PDF; 9.8 MB)
literature
- SM Yahya: Turbines Compressors and Fans , Tata McGraw-Hill, 2005, ISBN 9780070597709
