Machinery & Energetics

Based on the analysis of the current state of development and production of variable displacement axial rotor-piston pumps, the main trends in the development of this area of hydro-machine building have been clarified. The interest of consumers to expand the temperature range of these pumps in the direction of increasing maximum temperatures has been revealed. By methods of mathematical modeling, the static characteristics are predicted to change, which is one of the main indicators of the quality of the technical characteristics of variable displacement axial rotor-piston pumps. It is shown that, with the established accuracy standards for the pump control system control part at the pump outlet pressure close to the nominal value, when the temperature of the working fluid rises and the corresponding decrease in its viscosity, the flow rate of the working fluid for leaks increases substantially, which leads to a decrease in the volumetric efficiency, especially in pumps of small sizes. It is recommended to carry out measures to stabilize the spool and servo cylinder gaps.

variable displacement axial piston pump, flow rate characteristics, volume losses, working fluid temperature, viscosity