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:
Nov. 20, 1990
Filed:
Dec. 04, 1989
Masao Misumi, Tokyo, JP;
Yoshiaki Asayama, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Oval Engineering Co., Ltd., Tokyo, JP;
Abstract
A Karman vortex flow meter comprises a vortex generating post 4 disposed in a fluid conduit 1, a plurality of ultrasonic wave transmitters 6a, 6b provided in a wall of the conduit downstream of the post, and an ultrasonic wave receiver 8 provided in a wall of the conduit opposing the transmitters. The transmitters are either juxtaposed at a horizontal sectional face of the conduit and generated ultrasonic waves simultaneously toward the receiver, or they are provided in series in an axial direction of the conduit while the receiver is provided opposite the transmitter on the downstream side. In the latter embodiment the transmitters are connected to a change-over circuit which switches from the downstream transmitter to the upstream one when the detected frequency of the Karman vortex streets in the fluid exceeds a predetermined value.