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# What is the power of the pump shaft?

What is the power of the pump shaft?

Pump head, flow and power is to investigate the performance of water pump important parameters: 1. flow pump flow, also known as water delivery, it refers to the pump in the unit time to transport the amount of water.
Commonly used units are: kg meters / sec, kW, horsepower. The power unit of an electric motor is usually expressed in kW; the power unit of a diesel or gasoline engine is expressed by horsepower. The power of a power transmission pump shaft is called shaft power, which can be regarded as the input power of a pump. Generally speaking, the power of a pump is the power of a shaft. Because of the friction resistance between the bearings and the packing, the friction between the impeller and the water when rotating, the whirlpool of the water in the pump, the backflow of the gap, the entrance and exit, the impact of the mouth and so on. It consumes a part of power, so the pump will not be completely turned into the engine power input power, there is a loss of power, that is to say, the effective power and the power loss in the water pump and water pump shaft power. What is the relationship between pump shaft power and motor power?Answer: the pump shaft power is the original motivation to design on the pump power, during the actual operation, the operating point will change, so the original motivation to pump power should have a certain margin, the other motor output power due to power factor, so the experience is equipped with motor power is greater than the pump shaft power.
Expressed in symbolic Q, its units are liters / sec, cubic meters per second, and cubic meters per hour. 2. lift pump lift pump can lift refers to the height, usually with the mark "H", the unit of M. The head of the centrifugal pump is based on the center line of the impeller and is divided into two parts. The vertical height from the pump impeller centerline to the water surface, the water pump to suck water up to the height, called water head, referred to as the suction pump impeller; from the center line to the vertical height of the water tank, the water pump can put pressure on the height, called water pressure head, called pressure range. That is, pump head = suction head + water head, it should be noted that the nameplate marked "lift" refers to the pump itself can produce the head, it does not contain the pipe flow caused by friction resistance, loss, lift. In the selection of pumps, attention should not be ignored. Otherwise, the water will not be pumped. 3. power in a unit of time, the size of the work done by the machine is called power. Usually expressed in symbolic N

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