Rotor pump refers to the pump that changes the working volume through the relative movement between the rotor and the pump body, and then increases the energy of the liquid. Rotor pump is a rotary positive displacement pump with positive displacement. Its flow rate does not change with the change of back pressure.
Rotor pump is a form of positive displacement pump. It consists of a rotating rotor and a stationary pump body. It has no suction and discharge valves. The working volume is changed by the relative movement between the rotor and the pump body, and the liquid is discharged by the squeeze action of the rotating rotor while remaining on the other side. Out of the space, a low pressure is formed, and the liquid is continuously sucked in.
Rotor pumps can be divided into gear pumps, screw pumps, rotary piston pumps (cam pumps, roots pumps), flexible impeller pumps, sliding vane pumps, hose pumps, etc. according to their structure and principle. Rotor pump is a rotary positive displacement pump with positive displacement. Its flow rate does not change with the change of back pressure.
Rotor pumps are preferred: viscous liquids, where metering is required, where self-priming is required, where gas is contained, where small flow rates are required, pumps that require no shear on the medium, and pumps that require high pressure in reverse.
① There is no suction valve and discharge valve. Their main working parts are the pump casing and the rotor (such as gears, screws, cams, etc.).
② Compared with reciprocating pumps, the rotors perform slewing motion, without impact, higher speed, compact structure and smaller volume.
③ The discharge pressure is generally higher, but lower than the reciprocating pump, the flow rate is smaller than the reciprocating pump, and the efficiency is low. Generally it is only suitable for conveying a small amount of liquid, and it is mostly used as auxiliary equipment.
④Most rotor pumps are lubricated by the liquid they transport, so they are generally suitable for transporting liquids with lubricity and no solid particles.
⑤The rotor pump also discharges liquid intermittently, so the fluctuation of the flow is larger than that of the centrifugal pump and smaller than that of the reciprocating pump, but it can be regarded as approximately uniform.
⑥ When there is a liquid film on the surface of the rotor (transmitting lubricating liquid), the pump will have the ability of self-priming.