WO2011070885A1 - 液面検出装置 - Google Patents
液面検出装置 Download PDFInfo
- 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
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 abstract description 15
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005389 magnetism Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 9
- 229920003002 synthetic resin Polymers 0.000 description 8
- 239000000057 synthetic resin Substances 0.000 description 8
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229920001707 polybutylene terephthalate Polymers 0.000 description 3
- 229920006324 polyoxymethylene Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
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.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Level Indicators Using A Float (AREA)
Abstract
Description
2 フロート
3 フロートアーム
5 マグネット
6 磁電変換素子
8 第1ケース体(ケース体)
9 第2ケース体(ケース体)
9b 蓋部材
11 電気接続部材
14 タンク
14a 開口
15 液体
15a 液面
Claims (4)
- タンクに貯蔵した液体の液面の変位に追従作動するフロートを備えたフロートアームと、前記フロートアームの作動に伴って変位するマグネットと、前記マグネットの磁気変化を検出する磁電変換素子と、前記磁電変換素子と電気的に接続される電気接続部材と、を備えた液面検出装置において、前記電気接続部材の一部分が前記タンク外に露出するように前記磁電変換素子と前記電気接続部材をケース体で覆ったことを特徴とする液面検出装置。
- 前記ケース体は、前記磁電変換素子と前記電気接続部材の一部分を覆った第1ケース体と、前記電気接続部材の一部分が前記タンク外に露出するように前記第1ケース体を覆った第2ケース体とからなることを特徴とする請求項1に記載の液面検出装置。
- 前記タンクに設けた開口を塞ぐ蓋部材を前記ケース体に設けたことを特徴とする請求項1に記載の液面検出装置。
- 前記タンクに設けた開口を塞ぐ蓋部材を前記第2ケース体に設けたことを特徴とする請求項2に記載の液面検出装置。
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 (ja) | 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 (ja) | 2011-06-16 |
Family
ID=44145438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/069981 WO2011070885A1 (ja) | 2009-12-08 | 2010-11-10 | 液面検出装置 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2011122836A (ja) |
KR (1) | KR20120104564A (ja) |
CN (1) | CN102656428A (ja) |
IN (1) | IN2012DN04931A (ja) |
WO (1) | WO2011070885A1 (ja) |
Families Citing this family (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0271231U (ja) * | 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 |
-
2009
- 2009-12-08 JP JP2009278376A patent/JP2011122836A/ja active Pending
-
2010
- 2010-11-10 CN CN2010800552666A patent/CN102656428A/zh active Pending
- 2010-11-10 WO PCT/JP2010/069981 patent/WO2011070885A1/ja active Application Filing
- 2010-11-10 KR KR1020127014215A patent/KR20120104564A/ko not_active Application Discontinuation
-
2012
- 2012-06-05 IN IN4931DEN2012 patent/IN2012DN04931A/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0271231U (ja) * | 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 |
---|---|
KR20120104564A (ko) | 2012-09-21 |
IN2012DN04931A (ja) | 2015-09-25 |
CN102656428A (zh) | 2012-09-05 |
JP2011122836A (ja) | 2011-06-23 |
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