Title:
LIQUID LEVEL DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/139083
Kind Code:
A1
Abstract:
A liquid level detecting device (100) is provided with an ultrasonic oscillating element (11) and a housing (2). The ultrasonic oscillating element is capable of transmitting and receiving ultrasonic waves. The housing has in the interior thereof a propagation pathway along which the ultrasonic waves propagate. The propagation pathway includes a first pathway (4) and a second pathway (5). The first pathway extends horizontally from a position at which the ultrasonic oscillating element is provided. The second pathway extends upward from the end of the first pathway on the opposite side to the position at which the ultrasonic oscillating element is provided. The first pathway includes a contracting portion (41) and a stepped portion (43). The cross-sectional area of the contracting portion contracts gradually with increasing distance from the ultrasonic oscillating element. The cross-sectional area of the stepped portion contracts in a stepwise manner at the end of the contracting portion. The housing includes a pathway air vent hole (6) providing communication between the inside and the outside of the housing, in a portion vertically above the step portion or vertically above a region in the vicinity of the step portion.
Inventors:
MIYAGAWA ISAO (JP)
Application Number:
PCT/JP2019/000542
Publication Date:
July 18, 2019
Filing Date:
January 10, 2019
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
G01F23/296
Foreign References:
| US20050284217A1 | 2005-12-29 | |||
| JPS5744428U | 1982-03-11 | |||
| JP2006119046A | 2006-05-11 | |||
| US20090038394A1 | 2009-02-12 | |||
| JP2004340911A | 2004-12-02 |
Attorney, Agent or Firm:
NAGOYA INTERNATIONAL PATENT FIRM (JP)
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