Screw pumps occupy an important position in the industrial field because of their high efficiency, stability and wide applicability

Screw pump is a positive displacement pump that relies on the rotating movement of the screw to transport liquid. The core component is one or more screws, which form a closed chamber through the mesh of the screw and the inner wall of the pump, and the liquid is pushed from the suction end to the discharge end with the rotation of the screw.

1. How it works
The working principle of the screw pump is based on the rotation and engagement of the screw:

Single-screw pump: composed of a screw and a stator, the screw rotates eccentrically in the stator, forming a closed chamber to push the liquid forward.

Double screw pump: composed of two screws meshing each other, the liquid is pushed between the screws.

Three screw pump: composed of an active screw and two driven screw, suitable for high pressure, large flow occasions.

2. Main features
Low shear, no pulsation: the liquid flow is stable during the transportation process, suitable for transporting sensitive media (such as emulsion, liquid medicine, etc.).

Strong self-priming ability: with good self-priming performance, suitable for conveying high-viscosity liquids.

High efficiency and energy saving: high volume efficiency and low energy consumption.

Strong adaptability: can transport high viscosity, containing solid particles or corrosive media.

Low noise: Smooth operation, low noise.

3. Main types
Single screw pump: suitable for high viscosity, containing solid particles of the medium, such as sludge, sewage, oil, etc.

Double screw pump: suitable for conveying clean or medium containing a small amount of particles, such as lubricating oil, fuel oil, chemical liquids, etc.

Three screw pump: mainly used in high pressure, large flow occasions, such as hydraulic system, fuel transmission and so on.

4. Application field
Screw pumps are widely used in many industries:

Petrochemical: transportation of crude oil, asphalt, polymers, etc.

Food and beverage: high viscosity food such as syrup, chocolate and jam.

Pharmaceutical industry: conveying sensitive media such as liquid medicine and emulsion.

Environmental protection industry: used for sewage treatment, sludge transport, etc.

Marine industry: Used for fuel oil transportation, lubricating oil circulation, etc.

Step 5: Strengths
Simple structure and easy maintenance.

Suitable for a variety of media, including high viscosity, corrosive liquids.

Smooth operation, low noise.

Good self-priming performance, no need to start the pump.

6. Weaknesses
High manufacturing costs, especially multi-screw pumps.

The cleanliness of the medium has certain requirements (double screw pump and three screw pump).

Low efficiency at low pressure.

7. Key points of selection
Medium characteristics: viscosity, corrosiveness, solid content, etc.

Flow and pressure: Select the right model according to the requirements of the working condition.

Speed: Speed affects the flow and life of the pump, and needs to be selected according to the characteristics of the medium.

Material: Select pump body and screw material (such as stainless steel, carbon steel, etc.) according to medium corrosiveness.

Screw pumps occupy an important position in the industrial field because of their high efficiency, stability and wide applicability.