What do you mean by volumetric hydraulic pump?

According to the change in the volume of the working chamber of the oil suction and discharge of the hydraulic pump to become a volumetric pump hydraulic pressure, it can be structured to achieve the sealing of the working chamber, the working chamber can be week after week to increase and decrease when it increases with the suction port connection, when it decreases with the discharge cavity connected to the suction and discharge ports can not be communicated.

When the hydraulic pump is running, the volume of the oil cavity must be constantly by a small gradually increased, the formation of a vacuum, the tank of oil can be sucked in, when the volume of the oil cavity by a large gradually reduced, the oil is squeezed in the sealing of the working oil cavity, the pressure can be increased, the size of the pressure depends on the oil from the pump when the output of the resistance (such as the spring force of the one-way valve).

The size of the oil delivery capacity (or output flow) of such a pump depends on the number of sealed working chambers as well as the size and frequency of volume changes.

Extended information:

Movement brings about a change in the volume of the pump chamber, which in turn compresses the fluid and makes it pressurized. Must have the condition that the pump chamber has a sealed volume change.

Hydraulic pump drive shaft can not withstand radial and axial forces, so do not allow the direct installation of pulleys, gears, sprockets at the end of the shaft, usually with a coupling between the drive shaft and the pump drive shaft.

For manufacturing reasons, the pump and coupling coaxiality exceeds the standard, there are deviations in the assembly, then with the pump speed to increase the centrifugal force to increase the deformation of the coupling, deformation of the large centrifugal force to increase. Resulting in a vicious circle, the result of vibration noise, thus affecting the service life of the pump. In addition, there are such as coupling pin loose not fastened in time, rubber ring wear not replaced in time and other factors.

Baidu Encyclopedia - Volumetric Hydraulic Pump

Baidu Encyclopedia - Hydraulic Pump