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:
Jun. 21, 2011
Filed:
Oct. 30, 2008
Takeshi Morino, Hitachinaka, JP;
Yuki Okamoto, Hitachinaka, JP;
Naoki Saito, Tokai, JP;
Hiroshi Hirayama, Hitachinaka, JP;
Takahiro Miki, Bolton, GB;
Takeshi Morino, Hitachinaka, JP;
Yuki Okamoto, Hitachinaka, JP;
Naoki Saito, Tokai, JP;
Hiroshi Hirayama, Hitachinaka, JP;
Takahiro Miki, Bolton, GB;
Hitachi, Ltd., Tokyo, JP;
Abstract
An object of the present invention is to provide a structure which prevents a particulate contaminant and a liquid contaminant on which centrifugal separation hardly works, from arriving at a sensor element part. In order to attain the above described object, in a heat resistor type air flow rate measuring device which includes an auxiliary passage taking in a part of a fluid flowing in a main passage, and a plate-shaped sensor element installed in the aforesaid auxiliary passage and for detecting a flow rate of the fluid, and is a heat resistor type flow rate measuring device having an auxiliary passage formed along a curved line at 90° or more in an auxiliary passage portion at an upstream side from the plate-shaped sensor element, the aforesaid auxiliary passage is formed along a curved line at 90° or more on a phantom plane orthogonal to a sensor formation surface of the plate-shaped sensor element and parallel with a flow, and a sensor formation surface side and a rear side of the plate-shaped sensor element have gaps from an auxiliary passage wall surface.