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Title:
THERMAL FLOWMETER
Document Type and Number:
WIPO Patent Application WO/2017/208640
Kind Code:
A1
Abstract:
Provided is a thermal flowmeter capable of reducing measurement error during fluid pulsation compared to the prior art. This thermal flowmeter is provided with an auxiliary passage 307 that takes in some of the fluid flowing through a main passage and a flow rate measurement unit 451 disposed inside the auxiliary passage 307. The auxiliary passage 307 has a first passage 351 provided on the measurement surface 451a side of the flow rate measurement unit 451, a second passage 352 provided on the rear surface 451b side of the flow rate measurement unit 451, and an inclined passage 361 provided further to the downstream side of the second passage 352 in the forward direction F of the fluid than an outlet of the second passage 352. The inclined passage 361 has a first inclined surface 371 that is further to the first passage 351 side than the flow rate measurement unit 451 and is inclined in relation to the forward direction F from the second passage 352 side to the first passage 351 side.

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Inventors:
FUKAYA Masashi (6-6, Marunouchi 1-chome, Chiyoda-k, Tokyo 80, 〒1008280, JP)
TASHIRO Shinobu (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
UENODAN Akira (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
SAITO Naoki (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
SAITO Tomoaki (2520, Takaba, Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
Application Number:
JP2017/015070
Publication Date:
December 07, 2017
Filing Date:
April 13, 2017
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS, LTD. (2520, Takaba Hitachinaka-sh, Ibaraki 03, 〒3128503, JP)
International Classes:
G01F1/684; G01F1/00
Domestic Patent References:
2015-04-02
Foreign References:
JPH09329473A1997-12-22
JP2004226315A2004-08-12
US20140174166A12014-06-26
Attorney, Agent or Firm:
TODA Yuji (6-1, Marunouchi 1-chome, Chiyoda-k, Tokyo 20, 〒1008220, JP)
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