Title:
THERMAL FLOWMETER
Document Type and Number:
WIPO Patent Application WO/2018/003496
Kind Code:
A1
Abstract:
The objective of the present invention is to obtain a thermal flowmeter with which water droplets attached to a wall surface of a first passage are effectively directed toward a discharge port when fed into a third passage portion.
The thermal flowmeter 300 of the present invention is provided with: an auxiliary passage into which a gas being measured 30 flowing along a main passage 124 is fed; and a flow rate detecting unit 602 which measures the flow rate of the gas being measured 30, by means of heat transfer with the gas being measured 30 that is flowing through the auxiliary passage. Furthermore, the auxiliary passage comprises a first passage 701, a second passage portion 702 which branches off midway along a first passage portion and leads toward the flow rate detecting unit 602, and a third passage portion 703 which branches off midway along the second passage portion and leads toward a third outlet 703b, and a pressure loss generating means 704a is provided between a third inlet 703a and the third outlet 703b of the third passage portion 703.
Inventors:
SAITO TOMOAKI (JP)
TASHIRO SHINOBU (JP)
SAITO NAOKI (JP)
FUKAYA MASASHI (JP)
UENODAN AKIRA (JP)
TASHIRO SHINOBU (JP)
SAITO NAOKI (JP)
FUKAYA MASASHI (JP)
UENODAN AKIRA (JP)
Application Number:
PCT/JP2017/021909
Publication Date:
January 04, 2018
Filing Date:
June 14, 2017
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01F1/684
Domestic Patent References:
| WO2010031629A1 | 2010-03-25 | |||
| WO2017056699A1 | 2017-04-06 |
Foreign References:
| JP2002506528A | 2002-02-26 | |||
| JP2006501452A | 2006-01-12 | |||
| JP2013053965A | 2013-03-21 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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