Screw pump Centrifugal pump and centrifugal pump are two kinds of pumps commonly used in industrial production. Their working principles and application range are very different. Generally speaking, screw pump is suitable for conveying medium with relatively high viscosity, easy skinning and caking, while centrifugal pump is suitable for conveying medium with low viscosity, clean and particle free. This article will further explain the advantages, disadvantages and application scenarios of screw pump and centrifugal pump by comparing and analyzing their working principles, characteristics and application scope.

1、 Screw pump

IMO screw pump It is a positive displacement pump with screw as the main working part. Its working principle is to use the volume change of the cavity when the screw rotates to suck liquid or gas into the pump from the suction inlet. After the screw rotates, the pressure increases and the pump is discharged from the outlet. The characteristics of screw pump mainly include the following points:

1. Stable flow

Because the rotating speed of the screw pump is very stable, and the screw structure in the pump cavity is meshed with each other, it can maintain a stable flow output when conveying fluid.

2. High efficiency

Compared with other types of pumps, screw pumps have higher efficiency in conveying high viscosity fluids. This is because the screw pump can handle highly viscous media by disassembling the container, thus effectively reducing the impact of viscosity on flow.

3. Wide scope of application

Screw pumps are widely used in various fields. Its application scope includes oil field, chemical industry, paper industry, food and beverage industry, etc.

2、 Centrifugal pump

Alfa Laval Centrifugal pump is a kind of pump whose main working parts are high-speed rotating impeller. Its working principle is to pressurize the fluid by centrifugal force, so as to realize the function of suction and discharge. The characteristics of centrifugal pump mainly include the following points:

1. It can transport a large amount of media

Due to its high lift, the centrifugal pump can transport a large amount of media in a very short time, which is very effective for transporting clean water, sewage and other media.

2. Simple structure

Compared with screw pump, centrifugal pump is simpler in structure and maintenance.

3. Equipment is cheaper

Compared with screw pump, the cost of centrifugal pump is lower, which makes the use of centrifugal pump more common in some low-cost projects.

3、 Difference between screw pump and centrifugal pump

1. Operating principle

IMO The working principle of the screw pump is to transport liquid or gas by virtue of the positive displacement working principle of the screw, while the centrifugal pump generates centrifugal force by rotating the impeller to push the liquid or gas.

2. Scope of application

The screw pump is suitable for conveying fluids with high viscosity, easy to skin and caking, but its efficiency is not high when conveying media with low viscosity and no particles such as clean water. Centrifugal pumps are suitable for conveying low viscosity, no particles of clean water and other media, but there will be greater restrictions when conveying high viscosity fluids.

3. Ways to improve traffic

The screw pump increases the flow through mechanical meshing, while the centrifugal pump increases the flow by rotating the impeller to generate centrifugal force.

4. Difficulty in construction and maintenance

The structure of screw pump is more complex and difficult to maintain, but its application scenarios are more extensive; The centrifugal pump is relatively simple in structure and maintenance, but its application scenarios are relatively narrow.

To sum up, screw pumps and centrifugal pumps have their own advantages and disadvantages, and their application ranges are also different. When selecting pumps, appropriate pumps shall be selected according to different needs. Generally speaking, screw pumps are suitable for fluids with high viscosity and easy to skin, while centrifugal pumps are suitable for fluids with low viscosity and no particles.