Title:
LIQUID LEVEL DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/209170
Kind Code:
A1
Abstract:
This liquid surface detecting device is provided with: a float which rises and falls, following a liquid level; two ore more magnets which are attached to the float and are disposed with identical poles facing one another; a guiding member which guides the rising and falling of the float; a plurality of magnetic sensors which are attached to the guiding member, detect a magnetic flux density that varies in accordance with the rising and falling position of the magnets, and output an electrical signal corresponding to the magnetic flux density; and a detecting circuit which detects the position of the float on the basis of the electrical signals output by the plurality of magnetic sensors. The distance between adjacent magnetic sensors in the rising and falling direction is set to a first length. The distance between the magnets and the magnetic sensors in a horizontal direction that is perpendicular to the rising and falling direction is set to a second length. The first length is greater than the second length. The detecting circuit detects the position of the float on the basis of the electrical signals output by two adjacent magnetic sensors from among the plurality of magnetic sensors.
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Inventors:
ZHANG YINGNAN (JP)
Application Number:
PCT/JP2017/020203
Publication Date:
December 07, 2017
Filing Date:
May 31, 2017
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
G01F23/62
Domestic Patent References:
| WO2016163171A1 | 2016-10-13 |
Foreign References:
| JP2002250652A | 2002-09-06 | |||
| JPH06160157A | 1994-06-07 | |||
| JP2011220795A | 2011-11-04 | |||
| JP2002511571A | 2002-04-16 | |||
| US4976146A | 1990-12-11 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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