What is the reason why the power consumption of centrifugal pump increases

Centrifugal pump in use, is there any influence grow big power consumption, is what causes, centrifugal pump power overload seriously affect the service life of the pump, for that matter, I believe that each pump industry technical personnel are in research and summarize, to summarize some experience, hope this content can be used for each pump enterprises and units.

A centrifugal pump

What is a centrifugal pump

Centrifugal pump is the use of impeller rotation and make water centrifugal movement to work. Before starting the pump, the pump shell and the suction pipe must be filled with water, and then start the motor, so that the pump shaft drives the impeller and the water to do high-speed rotating movement, water centrifugal movement, is thrown to the impeller outer edge, through the cochlear pump shell of the flow into the water pump pressure pipe road.

The basic structure of the centrifugal pump is composed of six parts are respectively impeller, pump shell, pump shaft, bearing, seal, pump body.

Second, cause analysis

1, the pump matching is not reasonable, after the transformation of the pump or the replacement of the pump, the pressure and displacement are improved than the original pump, and the motor power is too small;

2. The pump outlet valve is too open, the pump pressure is too low, the pump displacement exceeds the specified value on the nameplate too much, and deviates too much from the working point;

3, packing pressure is too tight;

4, the power supply voltage is too low, the current exceeds the rated value;

5, motor or pump seriously different heart, serious vibration;

6, the rotor and stator parts of the pump friction serious;

7, motor rotor movement, position is not correct, journal steps and bearing end or coupling and oil seal cover grinding;

8. The coupling buffer and damping apron is too tight, and the motor coupling and bearing cover are worn by pump cuanping;

9, the pump balance plate did not open, serious grinding occurred, balance return pipe hot;

10, pressure relief sleeve or balance plate radial clearance is too small, too large swing, wear in operation;

11. When the pump is started, serious internal faults occur, such as mouth ring and bushing falling off or matching gap is too small;

12, pump shaft rigidity is too poor, bending deformation.

Three, processing methods

For the power loss of the centrifugal pump, there are roughly three countermeasures:

1. Timely take corresponding measures to deal with the situation on site

(1) Contact the power supply unit and adjust the power supply voltage to the specified range;

② Adjust the opening degree of the outlet valve to make it run at the normal operating point;

(3) appropriate control of pump pressure and displacement, reduce the motor running current;

④ Adjust the tightness of packing gland.

2. Put forward suggestions and suggestions on improving the mismatching of pump units to the superior production management department and design unit

(1) Replace the motor;

② Impeller reduction or cutting impeller.

3. If the above measures still cannot be eliminated, the pump should be stopped for inspection

(1) re-vent, drain the air in the pump;

Check and adjust the pressure of lubricating oil road, repair or replace bearing bush;

(3) replace the coupling damping rubber ring;

(4) repair or replace the balance plate;

(5) Three guarantee operations, repair and replace the damaged parts;

⑥ Cooperate with professional team to deal with motor failure.