The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 1992
Filed:
Oct. 12, 1990
George E Fredericks, Graz, AT;
Alfred Jaschek, Graz, AT;
Abstract
The invention relates to a plate orifice for a or in a measuring device for he flow metering of fluid streams, in particular gas streams, preferably for gas streams present in internal combustion engines, with the fluids, in particular the gases, being guided through at least one plate orifice (restrictor) disposed in a pipe and provided with a sharp edge definig its flow orifice, with a pressure sensor or a pressure measuring line of a differential pressure measuring device or of a differential pressure transducer disposed upstream as well as downstream of the plate orifice, the output signal of the differential pressure measuring device or the differential pressure transducer depending on the differential pressure forming the measuring signal for the fluid flow rate, in particular gas flow rate, through the plate orifice and optionally being fed to an evaluation unit. In plate orifices or measuring devices of this type, problems due to their contamination and their universal usability arise. These problems were overcome according to the invention by providing, in particular for the flow measurements of pulsating fluid streams, preferably gas streams, that the plate orifice is symmetrically formed at least in the zone of the sharp edge, preferably in its zone extending into the interior of the pipe, in relation to a plane passing through the sharp edge of the flow orifice of the plate orifice and that the flank angle (.alpha.) of the sharp edge is 70.degree. to 110.degree. at the most, preferably 90.degree. at the most. In addition, the invention relates to the embodiment of plate orifices and measuring devices per se.