Constant Flow Pump $—$ Constant flow pump

The Constant Flow Pump component produces a constant volumetric flow. It consists of a simple pump, a flow-control valve (three-port flow controller) and a pressure relief valve. This type of pump is commonly used to give constant flow in, for example, hydraulic power steering.

Variables

 Name Value Units Description Modelica ID $\mathrm{conPump}$ conPump $\mathrm{reliefValve}$ reliefValve $\mathrm{threeWayFC}$ threeWayFC $\mathrm{const}$ const $\mathrm{gain}$ gain

Connections

 Name Description Modelica ID $\mathrm{oil}$ oil ${\mathrm{flange}}_{\mathrm{Engine}}$ flange_Engine ${\mathrm{port}}_{B}$ Hydraulic port where oil leaves the component port_B ${\mathrm{port}}_{A}$ Port B, where oil leaves the component ($q<0$, ${p}_{B}<{p}_{A}$ means $0<\mathrm{Δp}$) port_A

Parameters

 Name Default Units Description Modelica ID ${p}_{\mathrm{rw}\left(\mathrm{pclosed}\right)}$ $1.9·{10}^{7}$ $\mathrm{Pa}$ Valve closed if $\mathrm{Δp}$ smaller prw_p[closed] ${p}_{\mathrm{rw}\left(\mathrm{popen}\right)}$ $2.05·{10}^{7}$ $\mathrm{Pa}$ Valve wide open if $\mathrm{Δp}$ higher prw_p[open] flow rate $1$ Constant output value flowRate ${\mathrm{D}}_{\mathrm{pump}}$ ${10}^{-4}$ ${m}^{3}$ Displacement per revolution Dpump ${G}_{\mathrm{int}}$ ${10}^{-13}$ $\frac{{m}^{3}}{s\mathrm{Pa}}$ Conductance of internal leakage Gint ${G}_{\mathrm{ext}}$ ${10}^{-13}$ $\frac{{m}^{3}}{s\mathrm{Pa}}$ Conductance of external leakage Gext external leakage $\mathrm{true}$ If true, a small amount of oil leaks to the tank components externalLeakage use volume A $\mathrm{false}$ If true, a volume is present at port_A useVolumeA use volume B $\mathrm{true}$ If true, a volume is present at port_B useVolumeB $J$ $0.01$ $\mathrm{kg}{m}^{2}$ Moment of inertia J ${\mathrm{ΔT}}_{\mathrm{system}}$ $0$ $K$ Temperature offset from system temperature dT_system