Rotor Design Solutions offer rotor design for all helical pump screw components including:
Triple Screw Pump rotors
Triple screw rotors have very small clearance gaps between them which allows extremely efficient pumping. They contact, and are therefore not gear driven. The fact they have such small gaps means they are limited in what medium they can pump. The fluid being pumped is also used as a lubricant, so the viscosity of the medium is also important. The profiles are normally 2 fluted. Male (Power) and female (Idler) rotors are of a different shape and the Idler outside diameter is normally 0.6 * the Power outside diameter. A video showing Rotor Design Solutions software for generating these profiles may be found here.
Twin screw positive displacement pump rotors
Geared twin screw machines have the advantage that they have no metal to metal contact. This enables them to pump any type of medium. These rotors are normally 1 or 2 fluted and the male and female rotors are identical. Each rotor normally consists of a section of left hand thread at one end and right hand thread at the other. This feature provides hydraulic balance. A video showing Rotor Design Solutions software for generating these profiles may be found here.
Twin screw Vacuum Pump rotors
These profiles are normally 1 or 2 fluted and the male and female rotors are identical. They are geared, twin screw machines with no metal to metal contact. The hook section of the rotor is made up of an Archimedes curve. This profile has virtually no blow hole at the tip of the ‘hook’ made by the curve. The blow hole is a leakage path between the rotors and the housing when they are in mesh. Vacuum screws are often designed with a variable pitch. A video showing Rotor Design Solutions software for generating these profiles may be found here.