Classification of rotor pumps

Rotor pump is divided into gear pump, screw pump, rotary piston pump (cam pump, Roots pump), flexible impeller pump, sliding vane pump, hose pump, etc.


(1) gear pump


Gear pumps are mainly composed of gear, shaft, pump body, pump cover, bearing sleeve, shaft end seal and so on. A revolving pump that relies on the change and movement of the working volume between the pump body and the meshing gears to transfer liquid or pressurize it. Gear pumps have two types of external and internal meshing. External meshing gear pump is divided into double gear pump, three gear pump and five gear pump, external meshing double gear pump is the most commonly used. A pair of meshing gears and pump bodies separate the suction cavity from the discharge chamber. When the gear rotates, the volume between the teeth at the side of the suction cavity increases gradually, the pressure decreases, and the liquid enters the teeth under the action of pressure difference. As the gear rotates, the fluid between the teeth is carried to the discharge chamber. At this time, the volume between the teeth of the cavity side gear is gradually reduced, and the liquid is discharged.


(2) screw pump


The screw pump consists of a pump housing and one or more screws. The working principle of twin-screw pump is very similar to gear pump. It relies on intermeshing screw to suck liquid. Screw pump is divided into single screw pump, twin-screw pump and three-screw pump according to the number of screw, of which twin-screw pump has two types: closed and non-closed.


(3) rotary piston pump


There are many kinds of rotary piston pumps, the most commonly used ones are cam pumps and Roots pumps.


Cam pump is a multi-purpose two-way volumetric pump, is one of the most advanced international fluid conveying equipment, it is using two synchronous rotor, the rotor is driven by a pair of external synchronous gears, the rotor in the drive shaft driven by synchronous reverse rotation, rotor and rotor-pump body does not contact each other. Instead, it forms a clearance line or a face seal, which constitutes a higher vacuum and discharge pressure, especially suitable for the transportation of food, medicine, corrosive and high viscosity media.


Roots pump and cam pump structure is similar, the difference is that the liquid seal should also be formed between the rotor, the large pump is mostly simply supported layout, its processing is simpler than the cam pump, the working pressure is lower than the cam pump.


(4) flexible impeller pump


The flexible impeller pump is a volumetric rotor pump. The flexible impeller pump is composed of a flexible impeller, pump body, mechanical seal and rotating shaft made of rubber. When the impeller rotates away from the eccentric section of the pump shell, the flexible impeller blade extends to create a vacuum, and the liquid is sucked into the pump. With the impeller rotating, the liquid then reaches the discharge side from the suction side. When the impeller blade contacts with the eccentric section of the pump shell, the working volume changes, and the liquid is discharged smoothly out of the pump.


(5) slide pump


The rotor with radial groove is installed in the pump body with eccentric stator. The slider is located in the radial groove of the rotor. The slider can be two or more pieces. When the rotor rotates, the slider is thrown out of the rotor body and slides along the inner surface of the stator. These slides and stators constitute a sealed cavity with the eccentric cavity gradually increased, continue to rotate, the cavity reduced to zero, and filled with the rotor, slides between the cavity began to suck in the suction area, and then pressure to the discharge area to complete the liquid delivery process.