What Do We Need To Know About Centrifugal Pumps? (1)

Jun 18, 2025

 

1. What is the main working principle of a centrifugal pump?

The electric motor drives the impeller to rotate at high speed, causing centrifugal force to be generated in the liquid. Due to the centrifugal force, the liquid is thrown into the side channel and discharged outside the pump, or enters the next stage impeller, thereby reducing the pressure at the inlet of the impeller and forming a pressure difference with the pressure acting on the suction liquid. The pressure difference acts inside the liquid suction pump, and due to the continuous rotation of the centrifugal pump, the liquid is continuously sucked in or discharged.

 

2. What are the functions of lubricating oil (grease)?

 

Lubrication and cooling function, flushing function, sealing function, vibration reduction function, protective function, and unloading function.

 

3. What are the three levels of filtration that lubricating oil needs to go through before use?

 

Level 1: Between the original lubricating oil drum and the fixed drum;

Second level: between the fixed oil drum and the oil pot;

Level 3: Between the oil pot and the refueling point.

 

4. What are the "Five Determinations" of equipment lubrication?

 

Fixed point: refuel according to regulations;

Timing: Add oil to the lubrication parts according to the prescribed time and change the oil regularly;

Quantitative: refueling according to consumption;

Quality control: Select different lubricating oils according to different models and ensure that the oil quality is qualified;

Designated personnel: Each refueling area must have a dedicated person in charge.

 

5. What are the hazards of water content in pump lubricating oil?

 

Moisture can reduce the viscosity of lubricating oil, weaken the strength of the oil film, and decrease the lubrication effect.

Water below 0 ℃ will freeze, seriously affecting the low-temperature fluidity of lubricating oil.

Moisture can accelerate the oxidation of lubricating oil and promote the corrosion of metals by low molecular weight organic acids.

Water will increase the foam property of lubricating oil and make it easy to produce foam.

Moisture can cause metal parts to rust.