Apparatus for metering fluid flow
AssigneePierburg Luftfahrtgerate Union GmbH
InventorsHeinz Holzem, Hans J. Henning
Life of this patent
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Abstract
Fluid flow metering and control apparatus includes a positive displacement flow meter, a pressure sensor responsive to the pressure difference between the inlet and the outlet of the flow meter and a servo drive mechanism controlled by the pressure difference sensor to maintain the pressure difference between the inlet and outlet side of the flow meter at zero. A hydraulic motor is utilized as the servo drive means.
Claims13
Apparatus for providing a continuous instantaneous measurement of a flowing fluid and for effecting dosing of said fluid at a particular flow rate, especially for use in fuel systems for combustion engines, comprising:
- means defining a main flow path for said flowing fluid;
- a displacement flow meter connected in said main flow path;
- servodrive means consisting essentially of a hydraulic motor for providing driving energy to said displacement flow meter to overcome the inherent frictional resistance thereof;
- by-pass means connected with said main flow path defining means for diverting fluid flow therefrom to effect driving of said servodrive means;
- a pressure difference sensor for sensing the pressure difference across said displacement flow meter;
- and regulating means responsive to said pressure difference sensor for controlling the flow of said diverted fluid through said by-pass means thereby to control operation of said servodrive means in accordance with the pressure difference across said displacement flow meter.
Dependencies are inferred from the claim text.