Liquid level detection device

Patent metadata

Field	Value
Publication number	US-9435678-B2
Application number	US-201314403933-A
Country	US
Kind code	B2
Filing date	Jun 5, 2013
Priority date	Jun 28, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A liquid level detection device is configured so as to reduce or eliminate the contact between electrical cords led out of a detection section. A liquid level detection device is provided with: a detection section which detects the position of a liquid surface on the basis of the rotation of a rotation section rotating as a float is displaced; a plate-like mounting plate section, one surface of which is a mounting surface to which the detection section is mounted; a flange section which is mounted to a tank for containing liquid; and first and second electrical cords which are led out of the detection section toward the flange section. A branch section which comprises a through-hole is provided in the mounting plate section. The second electrical cord passes through the branch section and is routed around from the mounting surface side of the mounting plate section to the back surface side thereof.

First claim

The invention claimed is:

1. A liquid level detection device comprising:
a detection section having a rotation section which is connected via a float floating on a liquid surface of a liquid and an arm, and which rotates around a predetermined rotary shaft with displacement of the float, the detection section detecting a position of the liquid surface, based on rotation of the rotation section;
a frame body having:
a plate-shaped mounting plate section, one surface of which is a mounting surface to which the detection section is mounted, and the other surface of which is a back surface opposite to the mounting surface; and
a plate-shaped flange section which comes up in a direction which is orthogonal to the mounting surface and the back surface from one end of the mounting plate section, and which is mounted to a tank housing the liquid;

first and second electrical cords which are led out from the detection section toward the flange section;
a first terminal, one end part of which is a connection portion to be connected to a tip end part of the first electrical cord at the bottom surface side that is a surface at the detection section side of the flange section, and the other end of which arrives at the top surface side that is a surface opposite to the bottom surface of the flange section, and further, the other end of which is an external connection portion which can be connected to a predetermined external device; and
a second terminal, one end part of which is a connection portion to be connected to a tip end part of the second electrical cord at the bottom surface side of the flange section, and the other end of which arrives at the top surface side of the flange section, and further, the other end of which is an external connection portion section which can be connected to the external device,
wherein, at the mounting plate section, a branch section made of a through hole or a cutout is provided between the detection section and the flange section,
the second electrical cord passes through the branch section to thereby bypass from the mounting surface side of the mounting plate section to the back surface side,
the tip end part of the second electrical cord is positioned at the back surface side of the mounting plate section,
the connection portion of the first terminal is positioned at the mounting surface side of the mounting plate section,
the connection portion of the second terminal is positioned at the back surface side of the mounting plate section,
the connection portion of the first terminal and the tip end part of the first electrical cord are connected to each other at the mounting surface side of the mounting plate section, and
the connection portion of the second terminal and the tip end part of the second electrical cord are connected to each other at the back surface side of the mounting plate section.

2. The liquid level detection device according to claim 1 , comprising:
a first pressing section which is positioned at the mounting surface side of the mounting plate section, and which presses a part of the first electrical cord so that the first electrical cord does not substantially move in a facial direction of the mounting surface; and
a second pressing section which is positioned at the back surface side of the mounting plate section, and which presses a part of the second electrical cord so that the second electrical cord does not substantially move in a facial direction of the back surface,
wherein the first pressing section is provided on a bottom surface of the flange section or on the mounting surface of the mounting plate section, and
the second pressing section is provided on the bottom surface of the flange section or on the back surface of the mounting plate section.

3. The liquid level detection device according to claim 2 , wherein
the first pressing section is closer to the bottom surface of the flange section than the connection portion of the first terminal,
the first electrical cord is led out from the detection section toward the flange section, the tip end part of which is oriented to the detection section side so as to return at a position which is closer to the bottom surface of the flange section than the connection portion of the first terminal,
the second pressing section is closer to the bottom surface of the flange section than the connection portion of the second terminal, and
the second electrical cord is led out from the detection section toward the flange section, the tip end part of which is oriented to the detection section side so as to return at a position which is closer to the bottom surface of the flange section than the connection portion of the second terminal.

4. The liquid level detection device according to claim 1 , wherein, on the top surface of the flange section, there is provided a connector cover section to cause external connection portions of the first and second terminals to be exposed to an outside thereof,
a connector section which can be connected to the external device, which is composed of the connector cover section and the external connection portions of the first and second terminals,
the flange section and the connector cover section are integrally formed of a predetermined resin,
of the first terminal, a part of a portion which is positioned at the top surface side of the flange section is obtained as a first extension portion extending in parallel to the top surface of the flange section,
of the second terminal, a part of a portion which is positioned at the top surface side of the flange section extends in parallel to the first extension portion, and is obtained as a second extension portion which is adjacent to the first extension portion,
the external connection portion of the first terminal is obtained as a first rod-shaped portion formed in a shape of a rod;
the first extension portion is made of the first rod-shaped portion and a first plate-shaped portion connecting to the first rod-shaped portion,
the external connection portion of the second terminal is obtained as a second rod-shaped portion formed in a shape of a rod,
the second extension portion is made of the second rod-shaped portion and a second plate-shaped portion formed in a shape of a plate, connecting to the second rod-shaped portion,
the first plate-shaped portion comes up more significantly than the first rod-shaped portion in a direction which is orthogonal to a direction in which the first extension portion extends, and which is spaced from the second extension portion, whereby a width of the first plate-shaped portion is larger than a width of the first rod-shaped portion,
the second plate-shaped portion comes up more significantly than the second rod-shaped portion in a direction which is orthogonal to a direction in which the second extension portion extends, and which is spaced from the first extension portion, whereby a width of the second plate-shaped portion is larger than a width of the second rod-shaped portion, and
at least parts of the first and second plate-shaped portions are covered in contact with the connector cover section.

5. The liquid level detection device according to claim 1 , the mounting plate section is further provided with a restraining section to restrain the detection section so as not to be mounted from the back surface side.

Assignees

• Nippon Seiki Co Ltd

Inventors

• Koide Shigeki
• Tsurumaki Keiji
• Ichisawa Hisahito

Classifications

• G01F23/36 Primary

  using electrically actuated indicating means {(G01F23/38 takes precedence)} · CPC title

• G01F23/363 Primary

  using electromechanically actuated indicating means · CPC title