Orifice measuring device

Details Orifice measuring device Orifice measuring device

1990-10-12

1992-02-11

Ng, Jin F.

Measuring and testing

Volume or rate of flow

Using differential pressure

7386152, G01F 142

Patent

active

050866559

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.

REFERENCES:
patent: 3469446 (1969-09-01), Kochey, Jr.
patent: 3521487 (1970-07-01), Akeley
patent: 3733898 (1973-05-01), Yamamoto et al.
patent: 4161119 (1979-07-01), Brandt, Jr.
patent: 4361050 (1982-11-01), Coussot et al.
patent: 4366718 (1983-01-01), Nelson
patent: 4413532 (1983-11-01), Van Scoy
patent: 4503594 (1985-03-01), Gall et al.
patent: 4557296 (1985-12-01), Byrne
patent: 4563901 (1986-01-01), Singh
`Republic Flow Meters`, Catalog #700, .COPYRGT.1933, pp. 1-24.

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