The effective power of the explosion-proof mining multistage centrifugal pump can be calculated by the flow rate, the head, and the density of the conveying medium. To calculate the shaft power, the efficiency must be known. Then how to calculate the efficiency of the explosion-proof mining multistage pump?
Explosion-proof mining multistage centrifugal pump efficiency refers to the ratio of the effective power of the pump to the shaft power. η=pe/p;
The power of a pump usually refers to the input power, that is, the power transmitted from the prime mover to the pump shaft, so it is also called shaft power and is represented by P.
The effective power is: the product of the pump head, mass flow and gravitational acceleration.
Pe=ρg qh (w) or pe=γqh/1000 (kw) ρ: the density of the liquid delivered by the pump (kg/m3);
Γ: the gravity of the liquid delivered by the pump γ=ρg (n/ m3) g: acceleration of gravity (m/s);
mass flow qm=ρq (t/h or kg/s);
Because the power of the explosion-proof mining multi-stage centrifugal pump N (KW) = head (m) × flow (m3/s) × 1000 (weight of water Kg/m3) ÷ 102 (power conversion coefficient) ÷ η (efficiency of the pump) , Which can obtain the efficiency of the pump. If the current and voltage can be measured (the power of the multi-stage centrifugal pump can be calculated), the efficiency of the multi-stage centrifugal pump can be obtained by measuring the flow and head. This is the efficiency calculation formula of the multi-stage centrifugal pump
Calculation of Effective Power of Multistage Centrifugal Pump for Explosion-proof Mine
Explosion-proof mining multi-stage centrifugal pump shaft power calculation formula
This is an explosion-proof multi-stage centrifugal pump for mining: flow × head × 9.81 × medium specific gravity ÷ 3600 ÷ pump efficiency Flow unit: cubic / hour, head unit: meter;
P=2.73HQ/η, where H is the head, the unit is m, Q is the flow, the unit is m3/h, and η is the efficiency of the pump. P is the shaft power, the unit is KW. That is the shaft power of the pump P=ρgQH/1000η (kw), where ρ=1000Kg/m3, g=9.8;
The unit of specific gravity is Kg/m3, the unit of flow is m3/h, the unit of head is m, 1Kg=9.8 Newton;
Then P=specific gravity*flow*head*9.8 Newton/Kg;
=Kg/m3*m3/h*m*9.8 Newton/Kg;
=9.8 Newton*m/3600 seconds;
=Newton*m/367 seconds;
=watt/367;
The above derivation is the origin of the unit. The above formula is the calculation of water power, and the shaft power is divided by the efficiency.
The efficiency and calculation formula of multistage centrifugal pump for explosion-proof mine
refers to the ratio of the effective power of the explosion-proof multistage centrifugal pump to the shaft power. η=Pe/P;
The power of a pump usually refers to the input power, that is, the power transmitted from the prime mover to the pump shaft, so it is also called shaft power and is represented by P.
The effective power is: the product of the pump head, mass flow and gravitational acceleration.
Pe=ρg QH (W) or Pe=γQH/1000 (KW);
Ρ: the density of the liquid delivered by the pump (kg/m3);
Γ: the gravity of the liquid delivered by the pump γ=ρg (N/ m3);
G: acceleration of gravity (m/s);
mass flow Qm=ρQ (t/h or kg/s);
The efficiency of explosion-proof mining multistage centrifugal pump is the ratio of the effective power of the multistage centrifugal pump to the shaft power. The effective power is the weight of the medium (in cattle per cubic meter) multiplied by the head (in meters) multiplied by the flow rate (in cubic meters per second) divided by 1000. Shaft power is the power delivered by the motor to the shaft of the multistage centrifugal pump.
