Three parameters that determine the performance of the pumps
2022-05-06
The flow rate of the pumps during operation is restricted by the lift. The higher the pump lift, the smaller the flow. If the head is fixed and you want to reduce the flow,the way to adjust the flow and save power is to use frequency conversion speed regulation.
The lift, flow and power of the water pumps are important parameters to examine the performance of the water pump:
1. Flow rate: The flow rate of the pumps is also called the water delivery volume, which refers to the amount of water delivered by the pumps per unit time. It is represented by the symbol Q and its unit is liter per second, cubic meters per second, cubic meters per hour.
2. Lift: The lift of the pumps refers to the height that the pump can lift water, usually represented by the symbol H, and its unit is meters. The head of the centrifugal pumps is based on the centerline of the impeller, as a benchmark, it consists of two parts. The vertical height from the center line of the pumpimpeller to the water surface of the water source, that is, the height at which the pump can absorb water, is called the suction lift. The vertical height from the center line of the impeller of the pump to the water surface of the water outlet, that is, the height at which the pump can press the water up, is called the pressure water head. Thus, pump head = suction head + pressure water head. When choosing a water pump, be careful not to ignore it. Otherwise, the water will not be pumped.
3. Power: The amount of work done by a machine in a unit of time is called power. Usually represented by the symbol N. Commonly used units are: kilogram m/s, thousand Watts, horsepower. Usually the power unit of the electric motor is expressed in kilowatts; the power unit of the diesel engine or gasoline engine is expressed in horsepower. The power transmitted by the power machine to the water pump shaft. The rate, called shaft power, can be understood as the input power of the pumps, usually the pump power refers to the shaft power. Due to frictional resistance of bearings and packing; impeller Friction with water during rotation; vortex of water flow in the pumps, etc. which must consume a part of the power, so it is impossible for the pumps to completely convert the power input by the power machine into effective power, and there must be power loss.
The lift, flow and power of the water pumps are important parameters to examine the performance of the water pump:
1. Flow rate: The flow rate of the pumps is also called the water delivery volume, which refers to the amount of water delivered by the pumps per unit time. It is represented by the symbol Q and its unit is liter per second, cubic meters per second, cubic meters per hour.
2. Lift: The lift of the pumps refers to the height that the pump can lift water, usually represented by the symbol H, and its unit is meters. The head of the centrifugal pumps is based on the centerline of the impeller, as a benchmark, it consists of two parts. The vertical height from the center line of the pumpimpeller to the water surface of the water source, that is, the height at which the pump can absorb water, is called the suction lift. The vertical height from the center line of the impeller of the pump to the water surface of the water outlet, that is, the height at which the pump can press the water up, is called the pressure water head. Thus, pump head = suction head + pressure water head. When choosing a water pump, be careful not to ignore it. Otherwise, the water will not be pumped.
3. Power: The amount of work done by a machine in a unit of time is called power. Usually represented by the symbol N. Commonly used units are: kilogram m/s, thousand Watts, horsepower. Usually the power unit of the electric motor is expressed in kilowatts; the power unit of the diesel engine or gasoline engine is expressed in horsepower. The power transmitted by the power machine to the water pump shaft. The rate, called shaft power, can be understood as the input power of the pumps, usually the pump power refers to the shaft power. Due to frictional resistance of bearings and packing; impeller Friction with water during rotation; vortex of water flow in the pumps, etc. which must consume a part of the power, so it is impossible for the pumps to completely convert the power input by the power machine into effective power, and there must be power loss.
