- Ceramic shaft / ceramic bearing
- Hardened chrome steel shaft / carbon bearing.
Canned rotor pump
This eliminates the need for shaft sealing by means of a stuffing box or mechanical seal, which is required for other pump types.The pumped medium serves both to lubricate the motor bearings (plain bearings) and to cool the interior of the rotor. This so-called wet space is sealed off from the atmosphere or the motor winding by a can. This can has an average wall thickness of only 0.1 to 0.3 mm and is made of non-magnetic high-alloy steel. The canister is statically sealed using O-ring seals. Function / feature
The advantage of this construction is clearly that it is completely maintenance-free. No exchange or messages, no exchange of sealing elements, but perfect function during the entire operating time.The smoothness of this design is remarkable. Apart from the damping properties of the water, in which the rotating parts move, the reason for this smoothness is the sliding bearing of the rotor. This eliminates all rolling or rolling noises that occur in rolling bearings z. B. can occur by means of ball bearings.Not only the smooth running, but also the service life and the degree of susceptibility to failure are decisively influenced by this component.The design of the bearing is one of the most important design features of wet rotor pumps. In addition to the structural design of the bearings, the material pairing of the bearing is of decisive importance for the operational safety of the pump. The following combinations have become established in practice: