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:
Mar. 09, 2021
Filed:
Jun. 05, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Abstract
The present invention is directed to a thermal flowmeter that prevents erroneous detection of backflow by suppressing circulation of air flow from a flow detection unit side to a back side or from the back side to the flow detection unit side and measures a gas flow rate with high accuracy. A thermal flowmeter of the present invention includes a bypass passage through which a gas to be measured passes; a dividing portion which divides the inside of the bypass passage into a first passage portion and a second passage portion; and a flow detection unit which is provided on a surface of the dividing portion on the first passage portion side and detects a flow rate of the gas to be measured. Further, the first passage portion has a detection surface on which the flow detection unit is exposed, an opposing surface which opposes the flow detection unit on the detection surface, and non-opposing surfaces and which are disposed at positions deviating from the opposing surface in a bypass passage width direction of the first passage portion and do not oppose the flow detection unit, and the non-opposing surface is separated from the detection surface farther than the opposing surface.