Klein, Schanzlin & Becker Aktiengesellschaft

Robert Boschgmbh

Heinz-Dieter Hellmann

Peter Hergt

Karl-Heinz Becker

Peter Milla

Jurgen Wesemeyer

Lothar Haas

Reinhard Fassel

Rolf Brautigam

To measure a wide range of flow rates, and particularly such low flow rates as 0.5 liters per hour, while being able to accurately also measure rates of about 100 liters per hour, fluid is introduced axially into a rotor (14, 36, 40) which has outlet openings (24, 36, 45) positioned at their circumference, the rotor being rotated by reaction on the rotor upon fluid flow from the outlet openings. The rotor operates within a fluid flow chamber (15) from which is conducted outwardly through a duct positioned thereabove. Inflow of fluid may be guided for linear flow by guide ribs (13). The rotor may be a hollow disk-like structure (FIGS. 1-3) with spiral guide vanes therebetween, or a T-shaped tubular structure (FIGS. 4-6). If fuel consumption of an internal combustion engine is to be measured in which pressurized fluid is supplied to the engine and excess returned, two such flow meters can be combined on a common shaft, with respectively oppositely facing outlet openings (36, 45), so that differential flow only is being measured, hence accurately measuring fuel consumption by the engine. Rotation of the rotor is sensed by an electro-optical sensor (29, 37).

Liquid flow meter

A centrifugal pump comprises a casing which has two volutes disposed substantially diametrically opposite each other in such a way that the end of the first volute is adjacent to the start of the second volute. The outer diameter of the casing approximates or equals the diameter of the first volute in the region of the end of the first volute. This contributes to compactness of the casing. The volutes surround a rotary impeller or a guide wheel which is installed in the casing downstream of the impeller. Each volute extends along an arc of at most 180 degrees. The casing can have one or more elongated channels extending from the end of the first volute, along the second volute, and to a common outlet nozzle for both volutes.

Centrifugal pump with double volute casing

The double volute casing of a centrifugal pump has a main portion which has first and second volutes extending along arcs of not more than 180 degrees. The outer diameter of the main portion equals or approximates the outer diameter of the end of the first volute, and such end is adjacent to the start of the second volute whose end communicates with an outlet nozzle of the main portion. The latter has two channels which flank the second volute and extend between the end of the first volute and the outlet nozzle. The inner sides of the channels are open and face the axial passage of the main portion. Such inner sides are sealed from the axial passage by tubular inserts which are installed in and are separably fastened to the main portion of the casing. The passage receives a single-suction or a double-suction impeller or a stationary guide wheel which is located downstream of the impeller. The main portion of the casing is a one-piece casting.

Centrifugal pump with open double volute casing

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Grunstadt, Germany

Heinz-Dieter Hellmann