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Can You Know The Power Loss Of The Hydraulic Pump?

First, the volume loss

①. The hydraulic chamber and the oil discharge chamber of the positive displacement hydraulic pump are separated in the pump, but the relative movement always has a certain gap, so the oil in the high pressure area of the pump must leak through the gap to the low pressure zone The The lower the viscosity of the hydraulic oil, the higher the pressure, the greater the leakage.

② hydraulic pump in the process of oil absorption, because the oil resistance is too large, the oil is too sticky or pump shaft speed is too high and other reasons will cause the pump suction empty phenomenon, so that the sealed working volume can not be filled with oil, that is, The working chamber is not being fully utilized.

For these reasons, the hydraulic pump has a volume loss. However, as long as the pump design is correct, the use of reasonable, one of the reasons caused by the loss can be overcome, that can reduce the pump volume loss. However, the volume loss caused by the leakage of the hydraulic pump during operation is unavoidable, that is, the volumetric loss of the pump can be approximately seen as a result of all leakage, so that the actual flow of the hydraulic pump is always less than the theoretical flow. The ratio of the actual flow to the flow rate is called the volumetric efficiency, which represents the magnitude of the hydraulic pump volume loss. The volumetric efficiency of the hydraulic pump represents the extent of the hydraulic pump volume loss.

Second, mechanical losses

①. When the hydraulic pump is working, there is mechanical friction between the relative moving parts, such as between bearing and shaft, between shaft and seal, between blade and inner wall of pump body, resulting in loss of frictional resistance. This loss is related to the output pressure of the hydraulic pump, and the higher the output pressure, the greater the frictional resistance loss.

②. Oil flow in the pump, due to the viscosity of the liquid and produce viscous resistance, will also cause mechanical losses. This loss and the viscosity of the oil, the pump speed, the more oil, the higher the pump speed, the greater the mechanical loss.

For the above reasons, the actual input power of the pump is greater than theoretically required power. The ratio of the theoretical input power to the actual input power of the hydraulic pump is called the mechanical efficiency, which indicates the degree of power loss. The ratio of the output power of the hydraulic pump to the input power is called the total efficiency of the hydraulic pump.