What is volumetric efficiency and mechanical efficiency
Pumps usually convert electrical energy into hydraulic energy. Of course, energy conversion never takes place without loss.
Part of the volume flow Qth flows inside the pump through the existing piston clearance, as squeeze oil through the tooth gaps of a gear pump back into the suction chamber.
This loss is referred to as leakage oil flow QL. depends on the play of the pump and increases with increasing pressure in the system. A large play of fit causes less friction, but the leakage losses are greater.
One defines thevolumetric efficiency:
ηVol = QeWith Qe = Qth - QL.
V.th = theoretical delivery volume with one pump revolution
Qe = effective volume flow
QL. = internal leakage oil flow of the pump
Qth = calculated (theoretical) volume flow
ηVol = volumetric efficiency
|Since a pump is a mechanical component, mechanical friction losses also occur. Therefore, the torque actually required must be correspondingly greater than the theoretically calculated torque to drive the hydraulic pump:M.to = Mth + MV.|
You define onemechanical-hydraulic efficiency:
ηmh = MthM.to = Torque of the drive torque in Nm
M.toM.th = calculated torque in Nm
M.V.= Torque loss due to friction in Nm
The pump is driven by an (electric) drive motor. Due to the leakage losses and the mechanical losses of the pump, the output (useful output) Pn be less.
This results in the overall efficiency ηtthe pump
η t = P e Ratio of output to output
or as a product of the individual degrees of efficiency:η t = η mh * η vol(Index t stands for `total`)
The different degrees of efficiency of a pump can be combined in one Efficiency characteristic field represent. The volumetric efficiency η is shownVol, the mechanical-hydraulic efficiency ηmh and the overall efficiency ηtdepending on different operating pressures:
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