US 9,810,570 B2
Liquid surface detection device
Hiroyuki Iryo, Niigata (JP); Yoshiyuki Shimazaki, Niigata (JP); and Yukio Ogasawara, Niigata (JP)
Assigned to NIPPON SEIKI CO., LTD., Niigata (JP)
Appl. No. 14/398,687
Filed by NIPPON SEIKI CO., LTD., Niigata (JP)
PCT Filed Apr. 5, 2013, PCT No. PCT/JP2013/060439
§ 371(c)(1), (2) Date Nov. 3, 2014,
PCT Pub. No. WO2013/172113, PCT Pub. Date Nov. 21, 2013.
Claims priority of application No. 2012-114311 (JP), filed on May 18, 2012.
Prior Publication US 2015/0107355 A1, Apr. 23, 2015
Int. Cl. G01F 23/72 (2006.01); G01F 23/38 (2006.01)
CPC G01F 23/72 (2013.01) [G01F 23/38 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A liquid surface detection device comprising:
a holder rotating in response to displacement of a float arm, the displacement accompanying a change in a liquid surface, the holder is provided with a first rotating section and a second rotating section;
a magnet having a solid cylindrical shape affixed to the holder and rotating along with the holder, the magnet being sandwiched by the first rotating section and the second rotating section in a rotary axis direction of the magnet;
a magnetic detection element detecting a magnetic force change accompanying the rotating motion of the magnet;
a body section being provided with a first rotary support section that rotatably supports the first rotating section of the holder; and
a cover being fixed to the body section and being provided with a second rotary support section that rotatably supports the second rotating section of the holder,
wherein the magnetic detection element disposed on an axis of rotation of the magnet in the following order: the magnet, the first rotary support section, and the magnetic detection element.