The agitator power is divided into running power and starting power. Running power refers to the power consumed by the blade to overcome the friction resistance of the liquid during remote rotation. Starting power refers to the power consumed by the blade to overcome the inertia of liquid rest during starting.
Calculation of agitator running power
P = factor m * n3 * rho di5
Type:
ξm----- constant term;
ρ----- liquid density, kg/m3;
N ----- Blade speed, r/min;
Di ---- Leaf diameter, mm;
From the above formula, we can draw the following conclusions:
1. The factors affecting the agitator power include medium concentration, blade diameter, blade Angle and blade speed;
2. Blade diameter is the parameter that has the greatest influence on agitator power;
3. Under normal circumstances, the diameter of the stirrer in the workshop is certain. When the power increases due to the change of the medium concentration, the most direct means is to reduce the speed in order to make the motor still meet the requirements;
Second, the factors affecting the power of agitator motor
Motor power calculation
PN = (P + PS)/eta
Type:
PN - motor power, KW;
P -- stirrer power, KW;
PS -- friction loss power of shaft sealing device, KW;
η -- mechanical efficiency of transmission device;
Factors influencing the agitator motor's power and influence of agitator power factor is different, the influencing factors of agitator power, of course, also can indirectly affect the motor power, but that interpretation is very system, not difficult to understand, here we're talking about the influence of the motor's power factor, it only refers to the factors influencing the motor's power. The following influencing factors are obtained through the formula: 1. The power loss caused by the friction of the shaft sealing device, which varies with the mechanism of the sealing system. In general, the power loss of the packing seal is large, and the power loss of the mechanical seal is relatively small. As A ROUGH ESTIMATE, THE PACKING SEAL power LOSS IS about 10% OF the DAMAGED MIXER power, while THE MECHANICAL seal power loss is only 10% to 50% of the PACKING seal power loss. 2. The influence of the transmission device on the motor power. From the above formula of stirring motor power, it can be seen that the influence of the transmission device on the motor is achieved through mechanical efficiency. Different structures of the transmission device (such as reducer, bearing) will have different mechanical efficiency. 3. In addition to the above two reasons, the rated power of the motor is also affected by the ambient temperature and altitude.
Third, summary
Through the above formula and conclusion, in order to make the blender have a better running state, the relevant factors should be fully considered when choosing the stirring motor. If the concentration is changed due to the change of process, it is necessary to maintain the normal operation of the motor and adjust the relevant parameters of the agitator appropriately.
