Among the different types of positive displacement pumps, a rotary pump is perhaps the most commonly used unit. The other type is called the reciprocating pump. Both pumps can be classified according to their applications, commercial or industrial.
Basically, rotary pumps work through the use of a turning mechanism or a rotor. They often operate along with vanes or grates. Though the pumps follow the same operating principle, each mechanism particularly works in a different way. Moreover, each may feature a rotor either on the inside or the outside of the pump. As for the types of rotary pump itself, it comes in two major classifications - single rotor and multiple rotor pumps. In this article, we will be explaining the workings of a single rotor pump.
Single rotor rotary pump is composed of various mechanisms. These include the flexible member or what they call the flexing vanes which enable the pump to move. This member comes either as a linear or a tube. The pumping function of the pump is highly reliant on how elastic these vanes are. Another major part of this pump is the peristaltic or a tube that is housed inside a circular casing. However, there are some models of rotary pumps that use linear components. This part is being turned by the rotor to give way to the processed fluid. It comes in various forms such as a roller or a wiper.
Other major parts of a single rotary pump are the piston, screw, and vane. Pistons are common with multiple rotor versions but they are also used in single versions. The screw meshes to displace the fluid and move the media. It uses a stator that has internal threads and external rotors. Finally, it is the vanes that draw the fluid in and out of the pumping cylinder and are mounted either in the stator or the rotor.
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