Oscillating metering pump

Abstract

A metering pump for conveying fluids, with a metering head in which a metering chamber is arranged, a displacement element that can be moved back and forth between a first position and a second position on a movement axis, and a drive that rotates around a rotation axis, whereby a rotation movement of the drive around the rotation axis is converted into an oscillating movement of a connecting rod by a gear arrangement. The connecting rod is connected to the displacement element in such a way that the displacement element is moved back and forth along the movement axis, whereby the drive performs a pendular movement with a twist angle of α<360° and a frequency f during the operation of the metering pump, and the gear arrangement comprises a cam 10 gear that is arranged on the rotation axis and has a curved running surface that deviates at least in sections from a circular path around the rotation axis, with the connecting rod rolling over a roller on the running surface, so that a stroke length of the displacement element is determined by the twist angle α and a slope of the running surface and a stroke frequency of the displacement element is determined by the frequency f.