NON-POSITIVE-DISPLACEMENT PUMPS

**Definition:** This place covers:

Non positive displacement pumps for liquids, for elastic fluids, or for liquids and elastic fluids, whether rotary or not having pure rotation.

**Limiting references (this place does not cover):** - Engine fuel-injection pumps -> F02M - Ion pumps -> H01J41/12 - Electrodynamic pumps -> H02K44/02

**Glossary:** - Engine: means a device for continuously converting fluid energy into mechanical power. Thus, this term includes, for example, steam piston engines or steam turbines, per se, or internal-combustion piston engines, but it excludes single-stroke devices - Pump: means a device for continuously raising, forcing, compressing, or exhausting fluid by mechanical or other means. Thus, this term includes fans or blowers - Machine: means a device which could equally be an engine and a pump, and not a device which is restricted to an engine or one which is restricted to a pump - Positive displacement: means the way the energy of a working fluid is transformed into mechanical energy, in which variations of volume created by the working fluid in a working chamber produce equivalent displacements of the mechanical member transmitting the energy - Non-positive displacement: means the way the energy of a working fluid is transformed into mechanical energy, by transformation of the energy of the working fluid into kinetic energy, and vice versa - Rotary-piston machine: means a positive-displacement machine in which a fluid-engaging work-transmitting member rotates about a fixed axis or about an axis moving along a circular or similar orbit. This definition applies also to engines and pumps