Basic principle and applicable occasions of screw pump
The screw pump plays an important role in the industry. Its principle is to use the rotation of the screw to suck and discharge the liquid. It mainly relies on the volume change and movement of the meshing space formed between the pump body and the screw to transport the liquid. The role of the screw pump in various fields of life is also different. It exerts its own characteristics in suitable occasions. It transports the medium containing particles or fibers, and when the inherent structure of the medium is not damaged, it is more ambitious to use a single screw pump for transportation. , we will introduce the relevant content in detail below.
First, the basic principle of screw pump
1. The basic principle of the screw pump: the screw pump is a positive displacement rotor pump, which mainly relies on the volume change and movement of the meshing space formed between the pump body and the screw to transport liquid or pressurize the liquid. Divided into single-screw pump, twin-screw pump and triple-screw pump. When the automatic screw rolls, it drives the driven screw that meshes with it to roll together, the volume of the screw meshing space at one end of the suction cavity gradually increases, and the pressure drops. The liquid enters the meshing space volume under the action of the pressure difference. When the volume increases to a larger size to form a sealed cavity, the liquid moves axially one after another in the sealed cavity until one end of the cavity is discharged.
At this time, the volume of the screw meshing space at one end of the discharge cavity is gradually reduced, and the liquid is discharged.
2. The working principle of the screw pump is similar to that of the gear pump, except that the screw replaces the gear in the structure. The pump has two structures of single-suction and double-suction, but the single-screw pump has only single-suction. The pump must be equipped with a safety valve (single screw pump does not have to be equipped) to prevent damage to the pump or the prime mover due to some reasons such as blockage of the discharge pipe that causes the pump outlet pressure to exceed the allowable value.
2. Application occasions of screw pump
1. Transport lubricating oil, transport fuel oil, transport various oils and polymers, suitable for transporting viscous liquids.
2. Transporting high-viscosity medium: According to the size of the pump, it can transport the medium with viscosity from 37000-200000 centipoise.
3. Transporting media containing particles or fibers: the particle diameter can be 30mm (not exceeding the rotor eccentric distance). Fiber length can be 350mm (proper pitch of 0.4 rotor).
4. When the conveying pressure is required to be stable and the inherent structure of the medium is not damaged, it is more ideal to use a single screw pump for conveying.