Internal gear pump without sickle element - incorporates method of dimensioning teeth to give compact design

摘要

The internal gear pump operates without a sickle element. It has a hollow wheel (6) and a pinion (5) in neighbouring housing parts in which the width of the teeth (12) of the pinion is at least as large as the pitch circle dia. (do) of the pinion. The total cross section surface of all the openings (17) through the hollow wheel amounts to at least 20 percent of the outer lateral area, determined by the width and the OD of the hollow wheel. USE/ADVANTAGE - Internal gear pump in which the outer dimensions have been reduced.