API 676 Progressive Cavity Pumps

The new NM Pump Series now incorporates NEMO® Pumps which pump and dose more efficiently, deliver more gently, operate more effectively and are easier to service. The pumps can be delivered according to API 676 and with magnetic coupling.

  

  

NM...BY Blockpump

This pump in modular block construction achieves very good adaptations                           to varied flowrates and pressures. It handles difficult media with ease. For optimum pump performance the 3 rotor/stator geometries are                                  selectable. The pump operates cost and space saving by means of the directly                            flanged drive and it is manufactured in all materials.

NM...SY Standard Pump

This general purpose pump is designed to handle materials that vary from                          waterlike consistencies to viscous pastes and slurries. Shear-sensitive                  materials are also handled with complete ease. A capacity of 50 to 500.000 l/h is possible. For optimal pump performance the 3 rotor/stator-geometries are                                         selectable. Manufactured in all materials.

 

NM Pump with Magnetic Coupling

For delivery of materials hazardous to your health and the environment, the use of entirely leakage free pumps is an absolute must. The combination of a NEMO® Pump + a Magnetic Coupling meets all these difficult requirements, with the Progressing Cavitiy Pump retaining all its many advantages. This perfect pump design is adapted to deliver materials containing solids, materials with high viscosities, and pasty and hardening product as well. Installation of a mechanical seal or shaft seal prevents the pumping matter from entering into the coupling space. For pumping product which may be harmful to the coupling space, a suitable buffer liquid can be addionally used as well.

Geometrical Models

The right geometry for every application – it’s possible with the NETZSCH modular design!

The NEMO® Pump belongs to the family of rotary positive-displacement pumps. The two conveying elements are comprised of the fixed stator and the rotor which turns within it.
The design is modular since the outer dimensions of the pumps are identical, as are the connections on the suction side and the discharge side, for all four geometries. With the exception of the rotor and the stator, all other components are also identical. This means that, if it is ever necessary to adapt a NEMO PUMP® to new flow rates or pressures after installation, this can be done by simply exchanging the rotor and stator to better suit the new conditions.

S/L Geometry

The helical eccentric screw/rotor has a circular cross section, a very long pitch and large thread depth. It oscillates in the fixed stator, which has an internal thread with the same profile as the rotor, but with 180° interval twin starts and twice the pitch.
As a result of this 1/2 ratio lobe geometry, cavities are formed between the rotor and the stator when the two are put together. When the rotor turns within the stator, the progressing cavities between the two transport the medium in a smooth and continuous manner from the suction to the discharge side of the stator.
The flow rate is determined by the pitch of the rotor/stator, the diameter and the eccentricity, as well as by the pumping rotation speed. The pressure capability depends on the number of stages, with the differential pressure being up to 6 bar per stage.
The 2-stage NEMO® Pump in S-Geometry can reach differential pressures of up to 12 bar at a flow rate of 100%. A single-stage NEMO® Pump in L-Geometry has the same outer dimensions as the 2-stage pump in S-Geometry, the same diameter and eccentricity, but twice the pitch of the rotor/stator. This pump therefore produces a flow rate of 200% over the S-Geometry at a differential pressure of up to 6 bar.