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May 18, 2022 View:

The difference between rotor pump and lobe pump

Rotor pumps

1. There is no suction or discharge valve, and their main working parts are the pump casing and rotor (such as gear, screw, cam, etc.).

2. Compared with reciprocating pumps, the rotor moves in a rotary motion without impact, has a higher speed, is compact, and is smaller in size.

3. The discharge pressure is generally higher, but lower than reciprocating pumps, the flow rate is smaller than reciprocating pumps, the efficiency is lower, generally only suitable for conveying a small amount of liquid, and mostly used as auxiliary equipment to use.

4. Most rotor pumps are lubricated by the liquid they transport, so they are generally suitable for transporting liquids that are lubricated and do not contain solid particles.

5. Rotor pumps also discharge liquids intermittently, so the fluctuation of flow is larger than centrifugal pumps and smaller than reciprocating pumps, but can be seen as approximately uniform.

6. When a liquid film is present on the surface of the rotor pump, the pump will have self-priming capability.

The gear pump is a rotary pump that relies on the change and movement of the working volume formed between the pump cylinder and the meshing gears to convey liquid or to pressurize it. When the gears rotate, the volume of the space on the disengaged side of the gears changes from small to large, forming a vacuum that draws the liquid in, and the volume of the space on the engaged side of the gears changes from large to small, while squeezing the liquid into the pipeline. The suction chamber and the discharge chamber are separated by the meshing line of two gears. The pressure at the discharge of a gear pump depends entirely on the amount of resistance at the pump outlet.

Differences: Gear pumps back are generally used as metering pumps, which handle small, but high heads. Rotor pumps are generally used to transport large amounts of liquid and are characterized by high resistance to wear and corrosion, and are particularly suitable for transporting media containing solid particles, fibers, or media that are corrosive, shear sensitive, or contain gas.

Rotor pumps embody the highest standards in the pump industry due to their special frictionless design and all stainless steel materials, and are widely used in the very demanding food, pharmaceutical, and fine chemical industries, with superior performance that cannot be replaced by gear pumps.