The basic parameters of the main performance of deep well water pump

Deep well water pump the main performance of the basic parameters of the following:
First, deep well pump flow Q
The flow rate is the volume (volume or mass) of the liquid delivered in the unit per unit time.
Volume flow with Q said, the unit is: m3 / s, m3 / h, l / s and so on.
The mass flow is expressed in Qm, in units of t / h, kg / s and so on.
The relationship between mass flow and volume flow is:
Qm = ρQ where ρ - the density of the liquid (kg / m3, t / m3), room temperature water ρ = 1000kg / m3.
Second, deep well pump head
The lift is the value of the unit weight of the pump pumped from the pump inlet (pump inlet flange) to the pump outlet (pump outlet flange). That is, a Newton liquid through the pump to obtain the effective energy. Its unit is N? M / N = m, that is pumping pump liquid column height, habits referred to as rice.
Three, deep well pump speed n
The speed is the number of revolutions per unit time of the pump axis, denoted by the symbol n in r / min.
Fourth, the NPSH NPSH
Nourishing allowance is also called net positive suction head, which is the main parameter of cavitation performance. The amount of NPS is indicated by Δh.
Fifth, power and efficiency
Pump power usually refers to the input power, that is, the prime mover on the pump shaft power, it is also known as the shaft power, with P said;
Pump effective power, also known as the output power, said Pe. It is the unit time from the pump out of the liquid in the pump to obtain the effective energy.
Since the lift is the effective energy obtained from the pump in the unit of the pump, the product of the lift and mass flow and the acceleration of gravity is the effective energy obtained from the liquid produced in the pump per unit of time Of the effective power:
Pe = ρgQH (W) = γQH (W) where ρ - pump transport liquid density (kg / m3);
Γ - pump the weight of the liquid (N / m3);
Q - pump flow (m3 / s);
H - pump head (m);
G - Gravitational acceleration (m / s2).