The performance parameters of the high-pressure self-balancing corrosion-resistant multi-stage centrifugal pump are a set of data used to characterize the performance of the pump. The basic performance parameters include flow rate Q, head H, shaft power N, speed n, efficiency η and other parameters. Under the conditions, the collected parameters draw the working performance curve, which is better to facilitate the analysis of the pump performance test. The basic parameters of the main performance of the high-pressure self-balancing corrosion-resistant multistage centrifugal pump are as follows:
1. Flow rate Q
Flow rate is the amount of liquid (volume or mass) delivered by the pump in a unit time.
The volume flow rate is expressed by Q, and the unit is: m3/s, m3/h, l/s, etc.
The mass flow rate is expressed by Qm, and the unit is: t/h, kg/s, etc.
The relationship between mass flow and volume flow is: Qm=ρQ
In the formula ρ——the density of the liquid (kg/m3, t/m3), normal temperature clear water ρ=1000kg/m3.
2, head H
The head is the increase in energy of the unit weight of liquid pumped by the pump from the pump inlet (pump inlet flange) to the pump outlet (pump outlet flange). That is, the effective energy of a Newtonian liquid obtained by the pump. Its unit is N·m/N=m, that is, the height of the liquid column of the pumped liquid, and it is often referred to as meter for short.
3, rotation speed n
Rotational speed is the number of revolutions of the pump shaft per unit time, expressed by the symbol n, and the unit is r/min.
4, NPSH
The cavitation margin is also called the net positive tip, which is the main parameter indicating the cavitation performance. The NPSH has been expressed by Δh in China.
5. Power and efficiency
The power of the pump usually refers to the input power, that is, the power on the shaft of the prime mover to support the pump, so it is also called the shaft power, represented by P;
The effective power of the pump is also called the output power, expressed by Pe. It is the effective energy obtained in the pump from the liquid delivered from the pump per unit time.
Because the head refers to the effective energy obtained from the pump by the unit heavy liquid output by the pump, the product of the head, mass flow rate and gravitational acceleration is the effective energy obtained from the liquid output from the pump per unit time-that is, the pump The effective power: Pe=ρgQH(W)=γQH(W)
In the formula ρ——the density of the liquid delivered by the pump (kg/m3);
Γ——The gravity of the liquid delivered by the pump (N/m3);
Q——The flow rate of the pump (m3/s);
H——the head of the pump (m);
G——Acceleration of gravity (m/s2).
The difference between the shaft power P and the effective power Pe is the power loss in the pump, and its magnitude is measured by the efficiency of the pump. The efficiency of the pump is the ratio of the effective power to the shaft power, expressed by η.
