ultrasound (us) - flow meter - assembly unit for incorporation in a messrohr

摘要

An ultrasonic (US) flow meter unit (E) for insertion in a measuring tube (M) especially for air mass measurements in a motor vehicle engine, having two US transducers (2, 3) which operate alternately as transmitting transducer or receiving transducer, and a reflector arrangement (4) for forming a reflection path, passing through the measuring tube (M), for US waves between the respective US transmitting transducer and the respective US receiving transducer. Provision is made of a carrying and mounting plate (1) for carrying one US transducer (2), the other US transducer (3) and the reflector arrangement (4), as well as for the sealing mounting of the unit (E) over an accommodating opening (5) for the unit (E) in the measuring tube (M), one US transducer (2) and the other US transducer (3) being arranged at a predetermined angle with respect to one another and preferably symmetrically inclined to the reflector arrangement (4), and the reflector arrangement (4) being carried by means of a retaining construction (41) by the carrying and mounting plate (1) at a distance from the latter in such a way that together with the US transducers (2, 3) the reflector arrangement forms inside the measuring tube (M) the reflection path necessary for the flow measurement. The carrying and mounting plate (1) preferably carries an operating and measurement electronic unit (6) between the two US transducers (2, 3) on its side averted from the measuring tube (M). IMAGE