Types of Screw Pumps
A screw pump is a rotary pump that relies on the volume change and movement of the meshing space formed by the pump body and the screw to transport liquid or increase its pressure. Its types can be divided in the following ways:
1. Classification by the number of screws
Single screw pump: A pump in which a single screw meshes and rotates in the internal thread groove of the pump body. Due to its structural characteristics, most single screw pumps are used to transport liquids with higher viscosity and liquids containing particles, so the selection of its number of revolutions is very critical. Common single screw pump models include G-type single screw pump, NM-type single screw pump, etc.
Twin screw pump: A pump that transports liquid by two screws meshing with each other, with higher suction capacity and less wear.
Three-screw pump: A pump that transports liquid by multiple screws (usually three) meshing with each other, suitable for high-viscosity media and multiphase mixed transportation.
Five-screw pump: A pump that transports liquid by five screws meshing with each other. Although it is not as common as the first three, it also has its unique advantages in certain specific applications.
2. Classification by screw suction method
Single suction type: the medium is sucked in from one end of the screw and discharged from the other end.
Double suction type: the medium is sucked in from both ends of the screw and discharged from the middle.
3. Classification by pump shaft position
Horizontal pump: a screw pump with a horizontally placed pump shaft.
Vertical pump: a screw pump with a vertically placed pump shaft.
4. Classification by purpose and special design
In addition to the above classification methods, screw pumps can also be classified according to purpose and special design, such as screw pumps for conveying specific media (such as food-grade screw pumps, chemical screw pumps, etc.) and screw pumps with special functions (such as screw pumps with adjustable speed, screw pumps with self-priming ability, etc.).
In summary, there are many types of screw pumps, and the selection needs to be comprehensively considered according to the specific application scenarios and needs.
