What are the flow calculation methods for pumps and the flow regulation methods for metering pumps?

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How to calculate the flow rate of the water pump? The volume of liquid discharged by a pump per unit time is called the "pump flow rate" and is represented by Q. The calculation formulas are as follows:

1. The formula for calculating the flow rate of the water pump is: Q=P η/2.73H, the unit of flow rate is m3/h, P is the shaft power, unit Kw, η is the efficiency of the pump, unit%, 2.73 is a constant, and H is the head m.

2. The shaft power of the water pump (kw) P=water delivery volume (liters/second) x head (meters)/102 x efficiency=flow rate x head x density x acceleration due to gravity. 102 is the unit sorting constant.

3、 The efficiency of a pump=effective power of the pump ÷ shaft power of the pump. The energy obtained by a unit weight of liquid through a pump is called head. The head of a pump, including suction, is approximately the pressure difference between the pump outlet and inlet. Additional information:

1. l/s=3.6m³ /h，1m³ /h=1/3600m³ /S1 cubic meter=1000000 cubic centimeters, 1 hour=3600 seconds 1 cubic centimeter/second=10-6 cubic meters/(1/3600 hour)=3.6 × 10-3 cubic meters/hour=0.0036 cubic meters/hour. Therefore, according to the above conversion formula, if the product parameter is 100 cubic centimeters per second, the conversion result is: 100 × 0.0036=0.36 cubic meters/hour.

2、 The mass (weight) flow rate is expressed in Qm, with the unit of t/h (tons per hour). The relationship between mass flow rate and volume flow rate, such as Kg/s (kilograms per second), is expressed as Qm=Q × p, where p represents the density of the liquid (Kg/m³); ， t/m³ ）Room temperature clean water p=1000kg/m³. Reference source: Baidu Baike: Pump flow ratep>

2. How to determine the flow rate, head, and power of a centrifugal pump? The flow rate, head, power and other parameters of a centrifugal pump can be confirmed through experimental measurements or calculations. Flow calculation: The flow rate of a centrifugal pump can be calculated using the following formula: Q=A * V, where Q represents the flow rate in m ³/h; A represents the cross-sectional area of the pump inlet or outlet, measured in square meters; V represents the average flow rate of the pump, measured in meters per second. According to the inlet and outlet pipe diameters and flow calculation formula of the pump, the flow rate of the pump can be calculated. Head calculation: The head of a centrifugal pump can be calculated using the following formula: H=(P2-P1)/ρ g+hs, where H represents head in meters, P2 represents outlet pressure in Pa, P1 represents inlet pressure in Pa, and ρ represents liquid density in kg/m ³; G represents the acceleration due to gravity, measured in m/s ²; HS represents the sum of the heights of various resistance losses, measured in meters. Typically, the values of liquid density and gravitational acceleration are known, while the inlet and outlet pressures can be measured through pressure sensors. Power calculation: The power of a centrifugal pump can be calculated using the following formula: P=ρ QH/3600 η, where P represents power in kW, and ρ represents liquid density in kg/m ³; Q represents flow rate, with the unit of m ³/h; H represents head, in meters; η represents pump efficiency. Calculate the power based on the flow rate and head of the pump, while also knowing the efficiency of the pump. Typically, the efficiency of the pump is provided by the manufacturer or confirmed t

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