Hydraulic piston pump components by major movement shape and movement pattern into gear pumps, vane pumps, piston pump, screw pump, the gear pump is divided into external gear pumps and internal gear pumps; into double acting vane pump vane pump, single acting vane pumps and rotary lobe vane pump; piston radial piston pump and is divided into axial Plug the pump; screw into a single screw, double screw, and three screw.

The hydraulic piston pump displacement divided by the quantitative pumps and variable displacement pump, which pumps can be single action variable vane pump, radial piston pump, axial piston pump. Hydraulic pressure forward, whether the direction of the oil export variable is divided into one-way pump and two-way pump, which pumps one-way and one-way quantitative variable pump can only rotate in one direction; double dosing pumps can change the steering pump, transform into, out of port, two-way variable pump can not only change the steering pump, but also can manipulate the variables body to transform into and out of port. Clearly, the two-way pump with symmetrical structure, and a one-way steering pump is designed for a non-symmetrical structure.

    

Hydraulic piston pumps, Hydraulic gear pumps and Hydraulic vane pumps selection

The principles and according to the main hydraulic pump are:

1.Whether the requirements of the variable requirements of the variable selection variable pump, in which the work of a single function low pressure vane pumps, only the machine tool system.

2.Working pressure rating of the current pressure of all kinds of hydraulic pump are improved, but relatively speaking, the highest rated pressure piston pump.

3.Working environment ability to better anti-pollution gear pump, so special occasions for poor working environment.

4.The noise indicators are low noise gear pump within the hydraulic pump, double acting vane pumps and screw pumps, two pumps after the instantaneous theoretical flow evenly.

5.The efficiency of sub-form of the structure, the maximum overall efficiency of axial piston pump; and the same structure of the hydraulic pump, the total displacement of a large high efficiency; the same displacement hydraulic pump, in the rated condition (rated pressure rated speed, maximum displacement), the highest overall efficiency, if the working pressure is lower than the rated pressure or speed lower than rated speed, the displacement of less than the maximum displacement, the pump will decrease the overall efficiency, even declined a lot.

Therefore, the hydraulic pump should be rated condition (rated pressure and rated speed), or close to the rated condition of the conditions.