Title:
THERMAL-TYPE FLOWMETER
Document Type and Number:
WIPO Patent Application WO/2019/049513
Kind Code:
A1
Abstract:
Provided is a thermal-type flowmeter which can reduce the deterioration of flow rate measurement precision and reliability, and which curbs the increase in cost of the thermal-type flowmeter more than conventional thermal-type flowmeters, and allows the addition of an electrostatic dissipating mechanism function. A thermal-type flowmeter 1 according to the present invention includes: a sub-passage 200 that takes in a part of a measured gas 5 flowing through a main passage; a flow rate detection element of a flow rate measurement unit 300 disposed in the sub-passage 200; a circuit package 301 that supports the flow rate detection element; and a circuit board 101 to which the circuit package 301 is fixed. The flow rate detection element has a detection surface which detects the flow rate of the measured gas and which is disposed such that the detection surface faces the circuit board 101. The circuit board 101 has a wiring 309, which is at GND potential, disposed thereon at a position opposite the detection surface of the flow rate detection element.
Inventors:
UENODAN AKIRA (JP)
YOGO TAKAYUKI (JP)
WATANABE TSUBASA (JP)
MIKI TAKAHIRO (JP)
TASHIRO SHINOBU (JP)
HOSHIKA HIROAKI (JP)
YOGO TAKAYUKI (JP)
WATANABE TSUBASA (JP)
MIKI TAKAHIRO (JP)
TASHIRO SHINOBU (JP)
HOSHIKA HIROAKI (JP)
Application Number:
PCT/JP2018/026641
Publication Date:
March 14, 2019
Filing Date:
July 17, 2018
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01F1/684
Domestic Patent References:
| WO2017073271A1 | 2017-05-04 | |||
| WO2012049934A1 | 2012-04-19 |
Foreign References:
| JP2001153706A | 2001-06-08 | |||
| JP2009036639A | 2009-02-19 | |||
| JP2002168669A | 2002-06-14 | |||
| US20130061684A1 | 2013-03-14 | |||
| DE102010020264A1 | 2011-12-01 |
Other References:
See also references of EP 3680630A4
Attorney, Agent or Firm:
TODA Yuji (JP)
Download PDF: