Title:
THERMAL FLOWMETER
Document Type and Number:
WIPO Patent Application WO/2015/045435
Kind Code:
A1
Abstract:
In order to provide a thermal flowmeter which is capable of suppressing changes over time in the properties for detecting a gas to be measured as a result of a contaminating substance, even when the contaminating substance enters an auxiliary channel, the auxiliary channel (330), which takes in some of the gas (IA) to be measured which flows through a principal channel (124), is provided with: a first channel (31) formed so as to take in the gas (IA) to be measured which flows through the principal channel (124), and formed from a principal intake port (350) which faces upstream in the principal channel (124) to the discharge port (355) which discharges some of the gas (IA) to be measured that was taken in; and a second channel (602) formed toward a flow detection unit (602) from an auxiliary intake port (34) for taking in the gas (IA) to be measured which flows through the first channel (31). The upstream-side channel (31) from the principal intake port (31) to the auxiliary intake port (34) in the first channel (31) is angled away from a flow detection unit (603) in relation to the flow direction (D) of the gas (IA) to be measured which flows through the principal channel (124). The flow detection unit (602) and the discharge port (355) are separated in the flow direction (D) of the gas (IA) to be measured in the principal channel (124) from a projection range (R) where the principal intake port is projected. The surface area of the discharge port (355) is smaller than the surface area of the principal intake port (350).
Inventors:
FUKAYA MASASHI (JP)
MORINO TAKESHI (JP)
INOUE ATSUSHI (JP)
SAITO NAOKI (JP)
INO MASANOBU (JP)
HANZAWA KEIJI (JP)
KIKAWA HIROMU (JP)
TASHIRO SHINOBU (JP)
MORINO TAKESHI (JP)
INOUE ATSUSHI (JP)
SAITO NAOKI (JP)
INO MASANOBU (JP)
HANZAWA KEIJI (JP)
KIKAWA HIROMU (JP)
TASHIRO SHINOBU (JP)
Application Number:
PCT/JP2014/052604
Publication Date:
April 02, 2015
Filing Date:
February 05, 2014
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01F1/684
Foreign References:
| JP2013024654A | 2013-02-04 | |||
| JP2004507754A | 2004-03-11 | |||
| JP2004519690A | 2004-07-02 |
Attorney, Agent or Firm:
INOUE Manabu et al. (JP)
Manabu Inoue (JP)
Manabu Inoue (JP)
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