WO2011070885A1 - Dispositif de détection de la surface d'un liquide - Google Patents

Dispositif de détection de la surface d'un liquide Download PDF

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Publication number
WO2011070885A1
WO2011070885A1 PCT/JP2010/069981 JP2010069981W WO2011070885A1 WO 2011070885 A1 WO2011070885 A1 WO 2011070885A1 JP 2010069981 W JP2010069981 W JP 2010069981W WO 2011070885 A1 WO2011070885 A1 WO 2011070885A1
Authority
WO
WIPO (PCT)
Prior art keywords
case body
conversion element
connection member
tank
liquid
Prior art date
Application number
PCT/JP2010/069981
Other languages
English (en)
Japanese (ja)
Inventor
寿人 市沢
Original Assignee
日本精機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精機株式会社 filed Critical 日本精機株式会社
Priority to CN2010800552666A priority Critical patent/CN102656428A/zh
Publication of WO2011070885A1 publication Critical patent/WO2011070885A1/fr
Priority to IN4931DEN2012 priority patent/IN2012DN04931A/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
    • G01F23/38—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using magnetically actuated indicating means

Definitions

  • the present invention relates to a liquid level detection device for detecting the level of liquid such as various fuels in a tank.
  • the main body portion is made of a resin material so that liquid can be prevented from entering the periphery of the magnetoelectric conversion element, and the terminal is provided between the end of the main body portion and the periphery of the magnetoelectric conversion element.
  • a rubber material is disposed so as to be in close contact with the entire circumference of the device, and the rubber material is integrated with the terminal by insert molding of the terminal at the time of molding, and is integrated with the periphery of the magnetoelectric conversion element and the terminal.
  • the rubber material was insert-molded in the main body when the main body was molded (see, for example, Patent Document 1).
  • the conventional liquid level detection device requires the rubber material in order to prevent liquid from entering the periphery of the magnetoelectric conversion element, and further arranges the rubber material so as to be in close contact with the entire circumference of the terminal. There was a need.
  • An object of the present invention is to provide a liquid level detection device capable of preventing liquid from entering the periphery of a magnetoelectric conversion element.
  • a float arm having a float that operates following the displacement of the liquid level of the liquid stored in the tank, a magnet that is displaced in accordance with the operation of the float arm, and a magnetoelectric conversion element that detects a magnetic change of the magnet
  • an electrical connection member electrically connected to the magnetoelectric conversion element, wherein the magnetoelectric conversion element and the electrical connection are arranged such that a part of the electrical connection member is exposed outside the tank.
  • the member is covered with a case body.
  • case body covers the first case body so as to expose a part of the magnetoelectric conversion element and the electrical connection member, and a part of the electrical connection member exposed to the outside of the tank. It consists of a 2nd case body.
  • a lid member for closing the opening provided in the tank is provided in the case body.
  • a lid member for closing the opening provided in the tank is provided in the second case body.
  • the liquid level detection device of the present invention reduces the rubber material that prevents the liquid from entering the periphery of the magnetoelectric conversion element, and reduces the manufacturing cost by reducing the step of arranging the rubber material. It is possible to provide a liquid level detection device capable of preventing liquid from entering the periphery of the element.
  • the liquid level detection device 1 includes a float 2, a float arm 3, an arm holder 4, a magnet 5, a magnetoelectric transducer 6, an electrical connection member 11, a holder member 7, and case bodies 8 and 9. And.
  • 10 is a shield case
  • 12 is a frame cover
  • 14 is a tank
  • 15 is a liquid stored in the tank 14.
  • the tank 14 is made of metal or synthetic resin and stores the liquid 15.
  • the liquid 15 is liquid fuel such as gasoline or alcohol.
  • the tank 14 includes an opening 14a, and the liquid level detection device 1 is installed in the tank through the opening 14a.
  • the float 2 floats on the liquid surface 15a of the liquid 15 such as liquid fuel stored in the tank 14 and operates following the displacement of the liquid surface 15a.
  • the float 2 is formed from a metal that is not easily corroded, such as stainless steel. ing.
  • the material of the float 2 is not limited to this embodiment, You may form with a synthetic resin.
  • the float arm 3 is made of a nonmagnetic metal, holds the float 2 at one end, and is attached to the arm holder 4 at the other end.
  • the arm holder 4 is made of synthetic resin and holds the float arm 3 and the magnet 5.
  • the arm holder 4 includes a cylindrical portion 4a, and a magnet 5 is provided inside the cylindrical portion 4a.
  • the arm holder 4 holds the float arm 3 by an arm holding portion 4c.
  • a cylindrical portion 4b is provided at the center of the arm holder 4, and a bearing 4d including a concave portion that rotatably supports a later-described support shaft portion of the second case body 9 is provided on the cylindrical portion 4b.
  • the arm holder 4 is rotatably supported by the second case body 9.
  • a frame cover 12 is disposed on the left side of the arm holder 4 in FIG. 1 and is fixed to the second case body 9.
  • the frame cover 12 holds the arm holder 4 in a retaining state and functions as a bearing that pivotally supports the cylindrical portion 4 b of the arm holder 4.
  • the magnet 5 is annular and is magnetized with two poles, and is integrally formed by means such as insert molding simultaneously with the molding of the arm holder 4.
  • the magnet 5 is disposed so as to oppose the outer periphery of a cylindrical portion described later of the second case body 9, and is disposed so as to surround the magnetoelectric conversion element 6.
  • the magnet 5 rotates with the operation of the float arm 3.
  • the magnetoelectric conversion element 6 is composed of, for example, a Hall element, and detects a change in magnetism accompanying rotation of the magnet 5 and outputs a detection signal.
  • the magnetoelectric conversion element 6 may be a magnetoelectric conversion element such as an MR element.
  • the magnetoelectric conversion element 6 is disposed on the holder member 7, and the lead 6 a is electrically connected to the electrical connection member 11.
  • the lead 6a and the electrical connection member 11 are connected by welding.
  • the electrical connecting member 11 is a lead wire, and is composed of a conductor 11a having good conductivity such as copper and an insulating film 11b covering the conductor 11a.
  • the conductor 11 a of the lead wire 11 is electrically connected to the lead 6 a of the magnetoelectric conversion element 6.
  • the holder member 7 is made of a synthetic resin, for example, a synthetic resin such as polybutylene terephthalate (PBT).
  • the holder member 7 includes a first arrangement portion 7 a that holds the magnetoelectric conversion element 6, a second arrangement portion 7 b that holds the electrical connection member 11, and a third arrangement portion 7 c that holds the electronic component 13. Yes.
  • the first arrangement portion 7a has a cup shape, and the magnetoelectric conversion element 6 is accommodated inside the cup shape.
  • positioning part 7b consists of a pin or wall part which pinches
  • positioning part 7c is a cup shape, and accommodates the electronic component 13 in the inside of this cup shape.
  • the electronic component 13 is, for example, a capacitor or a diode, and is intended to reduce input / output noise of the magnetoelectric transducer 6.
  • the electronic component 13 includes a lead 13 a and is electrically connected to the lead 6 a of the magnetoelectric conversion element 6.
  • the lead 13a and the lead 6a are connected by welding.
  • the case bodies 8 and 9 cover the magnetoelectric transducer 6 and the electrical connection member 11 so that a part of the electrical connection member 11 is exposed to the outside of the tank 14.
  • the case bodies 8 and 9 It consists of two case bodies 9.
  • the first case body 8 is made of, for example, a polyester-based synthetic resin, and can be injected at a low pressure into a mold for molding the first case body 8.
  • the first case body 8 is 2.5-4.
  • the injection pressure is 5 MPa.
  • the first case body 8 covers the magnetoelectric conversion element 6, the holder member 7, a part of the electrical connection member 11, and the electronic component 13. At the time of insert molding of the first case body 8, the magnetoelectric conversion element 6, the holder member 7, a part of the electrical connection member 11 and the electronic component 13 are covered with the first case body 8.
  • the second case body 9 is made of an oil-resistant synthetic resin that hardly swells with gasoline or alcohol, for example, a synthetic resin such as PBT or polyacetal (POM). It is formed by injection at an injection pressure of 100 to 150 MPa.
  • the second case body 9 covers the first case body 8 so that a part of the electrical connection member 11 is exposed to the outside of the tank 14 in which the liquid level detection device 1 is built. In the present embodiment, a part of the first case body 8 is also exposed outside the tank 14.
  • the second case body 9 also covers the shield case 10.
  • the second case body 9 includes a cylindrical portion 9a.
  • the cylindrical portion 9a includes a support shaft portion 9a1 that rotatably supports the arm holder 4.
  • the second case body 9 includes a lid member 9 b that closes the opening 14 a provided in the tank 14.
  • the lid member 9b has a disk shape.
  • the shape of the lid member 9b is not limited to the disk shape, and may be a polygon such as a quadrangle.
  • the second case body 9 is connected to a portion including the magnetoelectric conversion element 6 and the first case body 8 and the lid member 9b by an extension portion 9c.
  • the extension 9c is formed integrally with the second case body 9.
  • the thermal expansion coefficients of the first case body 8 and the second case body 9 are approximate and prevent peeling due to a temperature change.
  • the shield case 10 protects the magnetoelectric conversion element 6 from an external magnetic field, and is made of, for example, an iron-nickel alloy and has a cup shape including a cylindrical portion 10a and a bottom portion 10b. A part of the cylindrical portion 10 a is provided with a notch portion 8 c for drawing the first case body 8 out of the shield case 10.
  • the shield case 10 is covered with the second case body 9 in a state where the first case body 8 is housed in a recess formed by the cylindrical portion 10a and the bottom portion 10b.
  • the shield case 10 is formed so as to house a portion corresponding to the magnetoelectric conversion element 6 of the first case body 8.
  • the shield case 10 can block the influence of magnetism from the outside of the liquid level detection device 1 and obtain a highly accurate detection output.
  • the shield case 10 can be prevented from being deformed by covering the shield case 10 with the second case body 9. By preventing the deformation of the shield case 10, it is possible to prevent a change in magnetic characteristics. Furthermore, corrosion of the shield case 10 can be prevented. This is particularly effective when the fuel contains alcohol.
  • the rubber material that prevents the liquid from entering the periphery of the magnetoelectric conversion element 6 can be reduced.
  • the electrical connecting member 11 is a lead wire as in the present embodiment
  • the lead wire 11 is covered with the case bodies 8 and 9, so there is no risk of damaging the insulating coating 11b of the lead wire 11, and the insulating coating 11b. It is possible to prevent liquid from entering the periphery of the magnetoelectric conversion element 6 from the inside of the insulating coating 11b due to breakage of the insulating coating 11b.
  • the case bodies 8 and 9 covered the first case body 8 so as to expose a part of the magnetoelectric transducer 6 and the electrical connection member 11, and a part of the electrical connection member 11 exposed to the outside of the tank 14.
  • the second case body 9 By comprising the second case body 9, the movement of the electrical connection member 11 at the time of molding due to the injection pressure of the resin at the time of molding the second case body 9 can be restricted, and molding failure of the second case body 9 can be prevented. Can be prevented. Moreover, damage to the electrical connection member 11 due to the injection pressure can be prevented.
  • a lead wire is used as the electrical connection member 11.
  • a metal rod-like terminal it is possible to prevent the terminal from being deformed by the injection pressure.
  • the present invention can be used in a liquid level detection device that detects the liquid level of various liquids in a tank.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

L'invention porte sur un dispositif de détection de la surface d'un liquide, qui est configuré de telle manière que le coût de fabrication de celui-ci est réduit grâce à la réduction de la quantité d'un matériau en caoutchouc destiné à empêcher un liquide d'entrer dans la périphérie d'un élément de conversion magnéto-électrique, et à la réduction du nombre de processus pour disposer le matériau en caoutchouc, et, en même temps, de telle manière que le liquide est empêché d'entrer dans la périphérie de l'élément de conversion magnéto-électrique. Un dispositif de détection de la surface d'un liquide (1) comprend : un bras de flotteur (3) comportant un flotteur (2) qui fonctionne en suivant le déplacement de la surface (15a) du liquide (15) contenu à l'intérieur d'un réservoir (14) ; un aimant (5) déplacé lorsque le bras du flotteur (3) est actionné ; un élément de conversion magnéto-électrique (6) pour détecter une variation dans le magnétisme de l'aimant (5) ; et un élément de connexion électrique (11) électriquement connecté à l'élément de conversion magnéto-électrique (6). Le dispositif de détection de la surface d'un liquide (1) comporte également un premier corps d'enceinte (8) qui couvre l'élément de conversion magnéto-électrique (6) et une partie de l'élément de connexion électrique (11), et un second corps d'enceinte (9) qui couvre le premier corps d'enceinte (8), de telle manière qu'une partie de l'élément de connexion électrique (11) est exposée à l'extérieur du réservoir (14).
PCT/JP2010/069981 2009-12-08 2010-11-10 Dispositif de détection de la surface d'un liquide WO2011070885A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2010800552666A CN102656428A (zh) 2009-12-08 2010-11-10 液面检测装置
IN4931DEN2012 IN2012DN04931A (fr) 2009-12-08 2012-06-05

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009278376A JP2011122836A (ja) 2009-12-08 2009-12-08 液面検出装置
JP2009-278376 2009-12-08

Publications (1)

Publication Number Publication Date
WO2011070885A1 true WO2011070885A1 (fr) 2011-06-16

Family

ID=44145438

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/069981 WO2011070885A1 (fr) 2009-12-08 2010-11-10 Dispositif de détection de la surface d'un liquide

Country Status (5)

Country Link
JP (1) JP2011122836A (fr)
KR (1) KR20120104564A (fr)
CN (1) CN102656428A (fr)
IN (1) IN2012DN04931A (fr)
WO (1) WO2011070885A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6123578B2 (ja) * 2013-08-27 2017-05-10 株式会社デンソー 液面検出装置の製造方法
JP6634201B2 (ja) * 2014-03-17 2020-01-22 矢崎総業株式会社 液面レベルセンサ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0271231U (fr) * 1988-11-18 1990-05-30
JP2007183241A (ja) * 2005-12-07 2007-07-19 Denso Corp 液面検出装置およびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0271231U (fr) * 1988-11-18 1990-05-30
JP2007183241A (ja) * 2005-12-07 2007-07-19 Denso Corp 液面検出装置およびその製造方法

Also Published As

Publication number Publication date
IN2012DN04931A (fr) 2015-09-25
CN102656428A (zh) 2012-09-05
JP2011122836A (ja) 2011-06-23
KR20120104564A (ko) 2012-09-21

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