IMO screw pump And traditional centrifugal pumps are common industrial pump equipment, used to transport various liquid or semi-solid substances, such as water, oil, viscose paste, etc. The working principle and structural design of these two pumps are very different, which leads to their different advantages and application ranges in use.

working principle

Centrifugal pump is a kind of fluid conveying machinery that uses centrifugal force. The motor drives the impeller to rotate at high speed to suck the liquid into the center. Due to the centrifugal force, the liquid is separated from the impeller and the liquid flows out of the impeller; and Screw pump It is a machine that uses the volume change of the internal space of the screw rotation to realize the suction, compression and discharge of liquid. The fluid is sucked into the axial space at the center of the pump body, and then gradually compressed from the suction end of the screw to the outlet in the pump cavity due to the rotation of the screw.

Structural design

Taking centrifugal pump as an example, its structure is mainly composed of motor, bearing, impeller, pump casing, mechanical seal and inlet and outlet pipes. The impeller is the main working part, which is composed of several blades, and produces centrifugal force through rotation. The screw pump is composed of a screw, a pump chamber (or a pump wheel), and a sealed working chamber is formed between the screw and the pump body. When the screw rotates, the small sealed working chamber moves to the suction end to absorb the medium, and then the gradually reduced working chamber moves to the discharge end to compress and discharge the medium.

work efficiency

Because IMO agent Centrifugal pump needs impeller to rotate at high speed to generate centrifugal force, so its pressure and flow are limited by rotation speed, Viking In addition, steam bubbles are easy to appear when the medium with low pressure and high temperature is inhaled, which leads to the decline of pump efficiency. The screw pump has a high pressure and flow range, and can handle media with high viscosity, high temperature and low pressure. Because of the large pump chamber, the flow state is more stable than that of the centrifugal pump, and it is not easy to generate noise and vibration.

Maintenance

Due to the high-speed rotation of the impeller, the centrifugal pump is vulnerable to the impact and wear of the medium, and the bearing and mechanical seal also have the problem of wearing parts, so the maintenance is difficult, and it needs regular maintenance and replacement. The screw pump is relatively simple in terms of maintenance due to its simple structure and resistance to medium impact and wear. It only needs to replace seals and lubricating oil regularly.

In general, IMO screw pump and traditional centrifugal pump have their own advantages and disadvantages. In the actual process, they should be selected according to the needs of media characteristics, flow, temperature, pressure and operating environment. It is generally believed in the industry that centrifugal pumps should be selected for low viscosity, high flow, low pressure liquid media and pump stations that may produce cavitation and foam; For the liquid medium with high viscosity, high temperature, low flow and high pressure, and the occasions requiring stable operation and low noise, the screw pump is more suitable for selection.