Liquid surface detection device

Patent metadata

Field	Value
Publication number	US-9810570-B2
Application number	US-201314398687-A
Country	US
Kind code	B2
Filing date	Apr 5, 2013
Priority date	May 18, 2012
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

Provided is a liquid surface detection device providing for compactness and enabling a reduction in displacement of a rotating shaft of a magnet. In the liquid surface detection device, which is provided with a holder rotating in response to displacement of a float, said displacement accompanying a change in a liquid surface, which is provided with a magnet affixed to the holder and rotating along with the holder, and which is provided with a magnetic detection element detecting a magnetic force change accompanying the rotating motion of the magnet, said liquid surface detection device is provided with: a body section that provides on the holder, first and second rotating sections sandwiching the magnet therebetween in the rotary axis direction of the magnet, said body section being provided with a first rotary support section that places the magnetic detection element opposite the magnet in the rotary axis direction of the magnet, and that rotatably supports the first rotation section of the holder; and a cover that is affixed to the body section, and is provided with a second rotary support section that rotatably supports the second rotating section of the holder.

First claim

The invention claimed is:

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.

2. The liquid surface detection device according to claim 1 , wherein the first rotary support section has a slidable surface of which cross-section is formed in a circular shape and vertical to the rotary axis direction of the magnet, and the first rotating section includes a slide receiving surface that rotatably supports an outer circumference of the slidable surface.

3. The liquid surface detection device according to claim 1 , wherein the second rotating section has a slidable surface of which cross-section is formed in a circular shape and vertical to the rotary axis direction of the magnet, and the second rotary support section includes a slide receiving surface that rotatably holds an outer circumference of the slidable surface.

4. The liquid surface detection device according to claim 1 , wherein the magnetic detection element comprises a magnetic detection surface that detects the magnetic force change.

5. The liquid surface detection device according to claim 4 , wherein the magnetic detection surface of the magnetic detection element is perpendicular to the axis of rotation of the magnet.

6. The liquid surface detection device according to claim 5 , wherein the magnet including a first surface, a second surface opposite the first surface, and a lateral surface extending between the first surface and the second surface.

7. The liquid surface detection device according to claim 6 , wherein the first surface of the magnet and the magnetic detection surface of the magnetic detection element face each other.

Assignees

• Nippon Seiki Co Ltd

Inventors

• Iryo Hiroyuki
• Shimazaki Yoshiyuki
• Ogasawara Yukio

Classifications

• G01F23/72 Primary

  using magnetically actuated indicating means · CPC title

• G01F23/38 Primary

  using magnetically actuated indicating means · CPC title