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Basic parameters of water pump

The main performance parameters of the pump are as follows

Flow Q

Flow is the amount of liquid (volume or mass) that the pump sends out in unit time.

The flow is expressed as Q, in units: m3 / s, m3 / h, l/s. The flow rate on the water pump nameplate is the design flow rate of the water pump, which you call the limit flow rate. The pump is the most efficient at this flow rate.

Head H

The head is also called “the head of water”. The head is the increase in energy of the unit weight liquid pumped by the pump from the inlet to the outlet. It’s usually H in m. The head-on the pump nameplate is the design head of this pump, that is, the head corresponding to the design flow time, also known as the limit head.

The head of the pump represents the performance of the pump itself, which is only related to the energy of the liquid at the inlet and outlet flange of the pump and has no direct relationship with the pump device. However, the energy equation can be used to represent the head of the pump with the energy of the liquid in the pump device.

In general, the head of the horizontal centrifugal pump is the boundary of the centerline of the pump shaft, the side of the axis is the suction pipe, the water suction up, and the other side of the axis is through the outlet pipe to water pressure out. The height of the water suction is called the suction head, which is called the suction head, which is represented by the symbol H. The height at which water pressure goes out is called the pressure head, or the head, which is represented by the symbol H. So the head of the water pump is the sum of the water suction head and the water outlet head.

H is equal to H

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Basic parameters of water pump

Speed N

The speed is the speed per unit time of the pump shaft, represented by the symbol n, the unit is r/min. Generally speaking, the small-diameter pump speed is high, and the large diameter pump speed is low. The head-on the pump nameplate is the design head of this pump, that is, the head corresponding to the design flow time, also known as the limit head.

Power

The power Pa of the pump usually refers to the input power, that is, the power of the prime engine to the pump shaft, so it is also called the shaft power, expressed by Pa.   The shaft power Pa of the pump shall be determined by measuring the speed and torsional torque, or by measuring the input power Pa of the motor (mover) directly connected to the pump.

Known motor efficiency mot pump shaft power Pa is:  Pu = Pa X

Effective power

The effective power of the water pump is also called the output power, which is represented by Pu. It is the effective energy obtained by the liquid transported from the pump within time. Because the head is the effective energy obtained from the pump by the unit weight liquid output, the product of the head and mass flow and gravity acceleration is the effective energy obtained from the pump — the effective power of the pump.

Pu= gamma qh / 1000 = GQH in the form of GQH, if the unit of liquid severity is Kgf/m3, pu= gamma qh / 102

Shaft power

Shaft power, also known as the input power of the water pump, refers to the power of the power machine to transfer the feed pump shaft. In P. The shaft power on the water pump nameplate refers to the shaft power corresponding to the design flow rate, also known as the rated shaft power.

Supporting power

Supporting power refers to the power of the power machine supporting the pump, represented by P distribution. The value of supporting power is usually displayed on the pump nameplate or sample.

Efficiency

Efficiency is the effective degree of pump transmission power, which is the ratio of pump effective power to shaft power. Efficiency is an important technical and economic index of the water pumps. In notation.

Because there are various losses of mechanical, volume, hydraulic and so on, the effective power of the water pump is always smaller than that of the shaft. Therefore, the smaller the loss of power in the pump, the higher the efficiency of the pump, on the contrary, the greater the lost power in the pump, the lower the efficiency the pump. The calculated function is equal to pa.

Water absorption performance of water pump

The allowable vacuum height or the required cavitation allowance is the parameter to characterize the water absorption performance of the pump. In the design of the pump station, the installation elevation of the pump should be determined according to the water absorption parameters. The vacuum height allowed to be sucked up is represented by Hs, and the cavitation allowance must be expressed in NPSH r in m.

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