WO2011089992A1 - 液面検出装置の製造方法、及び液面検出装置 - Google Patents
液面検出装置の製造方法、及び液面検出装置 Download PDFInfo
- Publication number
- WO2011089992A1 WO2011089992A1 PCT/JP2011/050639 JP2011050639W WO2011089992A1 WO 2011089992 A1 WO2011089992 A1 WO 2011089992A1 JP 2011050639 W JP2011050639 W JP 2011050639W WO 2011089992 A1 WO2011089992 A1 WO 2011089992A1
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- WIPO (PCT)
- Prior art keywords
- liquid level
- level detection
- terminal
- detection device
- frame body
- Prior art date
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- 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
- G01F23/36—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 electrically actuated indicating means
-
- 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
- G01F23/36—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 electrically actuated indicating means
- G01F23/363—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 electrically actuated indicating means using electromechanically actuated indicating means
Definitions
- the present invention relates to, for example, a method for manufacturing a liquid level detection device that detects a liquid level (position of a liquid level) in a tank, and a liquid level detection device.
- FIG. 6 is an exploded plan view showing a conventional liquid level detection device.
- the liquid level detection device 101 supports a float 110, a float arm 115 having a float 110 attached to one end thereof, an arm holder 120 to which the other end of the float arm 115 is connected, and an arm holder 120 rotatably. And a support frame 130.
- the float 110 floating in the liquid changes its position up and down as the liquid level changes.
- the float arm 115 and the arm holder 120 rotate around a rotation bearing portion 131 formed on the support frame 130.
- a circuit board (not shown) is provided on the back surface of the arm holder 120 in the drawing.
- a resistor and electrodes (both not shown) connected to the resistor are formed on the circuit board.
- two liquid level detection terminals 135 are embedded in the support frame 130 to slide on the electrodes on the circuit board. The liquid level detection terminal 135 detects the electrical resistance value at the contact point with the electrode that changes as the arm holder 120 rotates, and outputs the electrical signal to the outside via the lead wire 133.
- the liquid level detection terminals 135 are set one by one in a mold for forming the support frame 130. Had to do. This process is very time-consuming and complicated, and increases the manufacturing cost of the liquid level detecting device 101.
- the present invention has been made in view of the above problems, and provides a manufacturing method of a liquid level detection device and a liquid level detection device that simplify the manufacturing process of the liquid level detection device and reduce the manufacturing cost. Objective.
- a method for manufacturing a liquid level detection device is a method for manufacturing a liquid level detection device that detects a liquid level by a variation in float.
- a liquid level detection device is a liquid level detection device that detects a liquid level by a change in float, and detects the liquid level by the change in float.
- a liquid level detection device is a liquid level detection device that detects a liquid level based on a float variation, and detects the liquid level based on the float variation.
- the present invention it is possible to provide a manufacturing method of a liquid level detection device and a liquid level detection device capable of simplifying the manufacturing process of the liquid level detection device and reducing the manufacturing cost.
- FIG. 3 is a diagram illustrating components of the liquid level detection device according to the embodiment of the present invention, in which (a) is a side view of the support frame indicated by arrows IIIa-IIIa in FIG. 1, and (b) is in FIG.
- FIG. 1 shows an exploded plan view of a liquid level detection device 1 according to an embodiment of the present invention.
- 2 is a diagram showing components of the liquid level detection device 1.
- FIG. 2A is a side view of the support frame 30 indicated by arrows IIIa-IIIa in FIG. 1
- FIG. 3C is a side view of the arm holder 20 indicated by arrow IIIb-IIIb in the middle
- FIG. 3C is a view showing the rear surface of the arm holder 20 indicated by arrow cc in FIG. 2B.
- a liquid level detection device 1 includes a float 10, a float arm 15 having a float 10 attached to one end, and the other end of the float arm 15 connected to the center.
- An arm holder 20 and a support frame (frame body) 30 that rotatably supports the arm holder 20 are provided.
- the arm holder 20 to which the float arm 15 is attached has a rear surface (hereinafter, a front surface in FIG. 1 is a front surface (an upper surface in FIG. 2), and a rear surface.
- a rotation shaft 23 (FIG. 2B) formed on the rear surface (the lower surface in FIG. 2) is inserted into the rotation bearing portion 31 of the support frame 30. Thereby, the arm holder 20 is rotatably supported by the support frame 30.
- the float 10 is formed of, for example, a synthetic resin, receives buoyancy from the liquid whose liquid level is to be measured, and floats in the liquid. Note that the shape of the float 10 is preferably substantially bowl-shaped so that the float 10 floats in the liquid in a stable state.
- the float arm 15 is made of, for example, a metal wire, and connects the float 10 and the arm holder 20.
- the float 10 attached to the tip can be reliably held by forming the arm holder 20 from a metal wire.
- One end of the float arm 15 is fitted in an opening (not shown) formed in the center of the arm holder 20. Thereby, the float arm 15 is fixed to the center of the arm holder 20.
- the arm holder 20 is made of, for example, a synthetic resin molded into a substantially disc shape.
- the arm holder 20 includes an arm fixing portion 22 for sandwiching the float arm 15, a rotation limiting key 21 for restricting the rotation of the arm holder 20, and a circuit board 25 (FIG. 2).
- the arm fixing portion 22 is formed on the front surface of the arm holder 20.
- the arm fixing portion 22 is configured by arranging two convex pieces parallel to the radial direction of the arm holder 20, and the end portion of the inner surface forming the insertion port 22 a of the float arm 15 (in FIG. 2B).
- a convex stopper (not shown) is formed on the upper end portion of the head. Therefore, when the float arm 15 is inserted into the arm fixing portion 22, the two convex pieces are elastically deformed outward, and the insertion port 22a of the float arm 15 is pushed and expanded. When the float arm 15 is further pushed into the insertion port 22 a, the float arm 15 is inserted into the gap between the two convex pieces and fixed to the arm fixing portion 22.
- the rotation limit key 21 is formed so as to protrude from the side surface of the arm holder 20 and regulates the rotation of the arm holder 20 by contacting the rotation limit protrusion 32 of the support frame 30. The specific function of the rotation limit key 21 will be described later.
- the circuit board 25 is attached to the rear surface of the arm holder 20 as shown in FIG.
- a first resistor 26, a first electrode 28 connected to the first resistor 26, a second electrode 29 connected to the first electrode 28, and a first A second resistor 27 provided between the electrode 28 and the second electrode 29 is formed.
- the first and second resistors 26 and 27 are made of, for example, ruthenium oxide.
- the first and second electrodes 28 and 29 are made of, for example, a silver palladium alloy.
- One of a pair of liquid level detection terminals 35 provided on the support frame 30 slides on the first and second electrodes 28 and 29 as will be described later.
- the first electrode 28 is positioned along the first sliding path on which one liquid level detection terminal 35 slides, and the second electrode 29 slides on the other liquid level detection terminal 35. Located along the second sliding path.
- the first electrode 28 and the second electrode 29 are electrodes for detecting the liquid level.
- the support frame 30 is made of, for example, synthetic resin, and a cylindrical rotation bearing portion 31 into which the rotation shaft 23 formed on the arm holder 20 is inserted is formed on the front surface thereof.
- the arm holder 20 is rotatably supported by the support frame 30 by inserting the rotation shaft 23 into the rotation bearing portion 31.
- the support frame 30 has two rotation restricting protrusions 32 protruding from the front surface.
- the rotation limiting protrusion 32 limits the rotation of the arm holder 20 to a predetermined angle range together with the rotation limiting key 21 formed on the arm holder 20. More specifically, the rotation restricting protrusion 32 is formed at a position where the rotation restricting key 32 protrudes from the side surface of the arm holder 20 when the arm holder 20 rotates.
- the arm holder 20 is stopped from rotating when the rotation limiting protrusion 32 and the rotation limiting key 21 come into contact with each other. Therefore, the arm holder 20 can rotate only within an angle range formed when the rotation bearing portion 31 and the two rotation restriction protrusions 32 are connected. Thereby, the abnormal rotational movement of the arm holder 20 is prevented, and erroneous detection by the liquid level detection device 1 is suppressed.
- the support frame 30 includes two liquid level detection terminals 35 as insert members.
- the liquid level detection terminal 35 outputs an electrical signal to a sliding terminal 35a that slides on the first and second electrodes 28 and 29 formed on the circuit board 25 of the arm holder 20 and an external circuit (not shown).
- An external output terminal 35b is provided.
- One liquid level detection terminal 35 of the two liquid level detection terminals 35 is slid to the first electrode 28 by the sliding terminal 35a, and the other liquid level detection terminal 35 is second by the sliding terminal 35a.
- the electrode 29 slides.
- the support frame 30 is formed with a cutting opening 30a for separating the pair of liquid level detection terminals 35.
- the opening 30a for cutting is an opening opened to secure a space for separating the pair of connected liquid level detection terminals 35.
- FIG. 3 is a schematic diagram showing the operation of the liquid level detection device 1 according to the embodiment of the present invention.
- the float 10 receives buoyancy from the liquid stored in a tank or the like and floats in the liquid.
- the float 10 rises following the rise of the liquid level (arrow in the figure).
- the float 10 rotates the float arm 15 and the arm holder 20 that are directly or indirectly connected to the support frame 30.
- the liquid level detection terminal 35 FIG.
- the liquid level detection terminal 35 outputs an electrical signal corresponding to the electrical resistance of the current path at the changed contact position to an external circuit (not shown) via the lead wire 33.
- This electric signal is a signal corresponding to the liquid level, and the external circuit derives the liquid level based on this signal.
- FIG. 4 is a schematic view showing a manufacturing method of the support frame 30 constituting the liquid level detection device 1 according to the embodiment of the present invention in the order of manufacturing ((a) to (c)).
- a plurality of liquid level detection terminals 35 are connected by a connecting part 37 and a carrier part 38 (both are referred to as a connecting material), and a terminal continuum 36 is integrated.
- a pair of liquid level detection terminals 35 embedded in one support frame 30 are connected by a connecting portion 37, and a plurality of pairs of liquid level detection terminals 35 are connected by a carrier portion 38.
- the carrier part 38 functions as a part to be gripped or adsorbed when the terminal continuous body 36 is handled, the carrier part 38 has a larger area than the connecting part 37.
- the connecting portion 37 and the carrier portion are formed so that the portion formed linearly in the horizontal direction in the drawing is formed in the terminal continuous body 36. 38 is arranged.
- the connecting portion 37 and the carrier portion 38 can be arranged at the boundary between the sliding terminal 35a and the external output terminal 35b, the external output terminal 35b connected to the lead wire 33 is bent to improve the strength. Can be achieved.
- the connecting portion 37 near the center of the liquid level detection terminal 35 and forming the linearly formed portion on the terminal continuous body 36, the terminal continuous body 36 can be easily handled.
- the liquid level detection device 1 can be easily manufactured.
- the prepared terminal continuum 36 is placed in a mold (not shown) for molding the support frame 30.
- the same number of molds (not shown) as the number of pairs of liquid level detection terminals 35 formed on the terminal continuum 36 are prepared.
- the material of the support frame 30 in a fluidized state is pressurized and injected into a mold (not shown) and solidified.
- the some support frame 30 connected by the carrier part 38 can be shape
- the support frame 30 shown in FIG. 4B is in a state where a pair of liquid level detection terminals 35 embedded in one support frame 30 are connected to the connection portion 37. Adjacent support frames 30 are connected by the carrier portion 38.
- the connection part 37 is distribute
- the connecting portion 37 that connects the pair of liquid level detection terminals 35 and the carrier portion 38 that connects the support frame 30 are cut and removed. As a result, the connection state between the pair of liquid level detection terminals 35 is released, and the support frame 30 is individually separated to complete the support frame 30.
- the terminal continuous body 36 on which a plurality of liquid level detection terminals are formed is set in a mold at a time, and a plurality of support frames are provided. 30 can be molded.
- the individual support frames 30 can be manufactured by cutting and removing the connecting portions 37 and the carrier portions 38 of the terminal continuous body 36. Therefore, the conventional process of arranging the liquid level detection terminals 35 one by one in the mold is not required, the manufacturing process of the liquid level detection terminals is simplified, and the manufacturing cost of the liquid level detection device is reduced. Can do.
- the terminal continuous body 36 in which the liquid level detection terminals 35 for the plurality of support frames 30 are formed is set and arranged in the mold for the plurality of support frames 30.
- the support frame 30 may be formed by setting a terminal continuous body in which only the detection terminal 35 is connected by the connecting portion 37 to a single mold for the support frame 30. In such a method, the carrier portion 38 of the terminal continuum 36 need not be formed.
- FIG. 5 is a schematic view showing a manufacturing method of the support frame 30 constituting the liquid level detection device 1 according to another embodiment of the present invention in the order of manufacturing ((a) to (c)).
- the manufacturing method of the liquid level detection device 1 according to the present embodiment is different from the above embodiment in that the fixing hole 39 is formed in the connecting portion 37 and the carrier portion 38 of the terminal continuous body 36. Since the other configurations are the same, in FIG. 5, the same reference numerals are given to the same members as those in the above embodiment, and in the following description, differences from the above embodiment will be mainly described.
- a terminal continuous body 36 formed by connecting a plurality of liquid level detection terminals 35 is prepared.
- the terminal continuous body 37 two fixing holes 39 are formed in each connecting portion 37, and four fixing holes 39 are formed in each carrier portion 38.
- the prepared terminal continuous body 36 is disposed in a mold (not shown) for forming the support frame 30.
- the material of the support frame 30 in a fluidized state is injected under pressure into a mold (not shown) and solidified.
- the some support frame 30 connected by the carrier part 38 can be shape
- the carrier part 38 connected to the support frame 30 and the connecting part 37 connecting the pair of liquid level detection terminals 35 are cut and removed, and the plurality of support frames 30 are removed.
- the fixing hole 39 formed in the terminal continuous body 36 will be described.
- the fixing hole 39 is provided in the vicinity of the cutting position of the connecting portion 37 of the liquid level detection terminal 35 and the carrier portion 38.
- the fixing hole 39 of the terminal continuum 36 arranged in a mold is filled with the material of the support frame 30 injected under pressure. Therefore, the terminal continuum 36 is firmly fixed to the support frame 30 at the position where the fixing hole 39 is formed, that is, in the vicinity of the cutting position of the connecting portion 37 and the carrier portion 38.
- the portion of the terminal continuum 36 that is firmly fixed in this manner can resist the force (mainly tensile force) acting when the connecting portion 37 and the carrier portion 38 are cut, and as a result, the liquid level detection The deformation of the terminal 35 can be prevented. Thereby, the terminal continuous body 36 can be stably cut, and the productivity of the liquid level detection terminal can be increased.
- It can be used for a manufacturing method of a liquid level detection device for detecting a liquid level (position of a liquid level) in a tank and a liquid level detection device.
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Level Indicators Using A Float (AREA)
Abstract
Description
10 フロート
15 フロートアーム
20 アームホルダ
25 回路基板
30 支持フレーム
30a 切断用開口部
35 液面検出端子
35a 摺動端子
35b 外部出力端子
36 端子連続体
37 連結部
38 キャリア部
39 定着孔
Claims (7)
- フロートの変動により液位を検出する液面検出装置の製造方法において、
前記フロートの変動を受けて回動する電極に摺動する摺動端子と、外部に電気信号を出力する外部出力端子とを有する端子が、連結材により複数個、連結されて形成された端子連続体を用意する工程と、
前記端子連続体の一部を埋設するフレーム体の成形用の金型に、前記端子連続体を配置する工程と、
前記端子連続体が配置された前記金型に前記フレーム体の材料を注入し、該フレーム体を成形する工程と、
成形した前記フレーム体から前記連結材を切断、除去して、複数の前記端子間の連結状態を解除する工程と、を備え、
前記連結材は、前記端子の中央、あるいは中央近傍を接続する、
ことを特徴とする液面検出装置の製造方法。 - 前記連結材は、前記端子を構成する前記摺動端子と前記外部出力端子との境を接続することを特徴とする請求項1に記載の液面検出装置の製造方法。
- 前記連結材は、前記端子の接続方向に直線的な部位が端子連続体に形成されるように配置されていることを特徴とする請求項1又は請求項2に記載の液面検出装置の製造方法。
- 前記端子連続体には、前記連結材の切断線の近傍に前記フレーム体が埋め込まれる孔が形成されていることを特徴とする請求項1乃至3のいずれか1項に記載の液面検出装置の製造方法。
- 前記フレーム体は、一対の前記端子を備え、
前記フレーム体を成形する前記工程は、前記連結材の位置に対応する部分に前記一対の端子を連結している連結材を切断、除去するための開口を前記フレーム体に形成することを特徴とする請求項1乃至4のいずれか1項に記載の液面検出装置の製造方法。 - フロートの変動により液位を検出する液面検出装置において、
前記フロートの変動により液位を検出するための電極に摺動する摺動端子と、外部に電気信号を出力する外部出力端子とを有する一対の端子が埋め込まれたフレーム体を備え、
前記フレーム体には、前記一対の端子を分離するための開口が設けられている、
ことを特徴とする液面検出装置。 - フロートの変動により液位を検出する液面検出装置において、
前記フロートの変動により液位を検出するための電極に摺動する摺動端子と、外部に電気信号を出力する外部出力端子とを有する一対の端子が埋め込まれたフレーム体を備え、
前記端子には、前記フレーム体の外縁近傍に設けられ、前記フレーム体が入り込む孔が形成されている、
ことを特徴とする液面検出装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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IN6452DEN2012 IN2012DN06452A (ja) | 2010-01-21 | 2011-01-17 | |
KR1020127019025A KR20120127420A (ko) | 2010-01-21 | 2011-01-17 | 액면 검출 장치의 제조 방법 및 액면 검출 장치 |
CN2011800068051A CN102762961A (zh) | 2010-01-21 | 2011-01-17 | 液面检测装置的制造方法以及液面检测装置 |
EP11734598.3A EP2527806A4 (en) | 2010-01-21 | 2011-01-17 | DEVICE FOR DETECTING THE LEVEL OF A LIQUID, AND METHOD OF MANUFACTURING THE SAME |
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JP2010011288A JP5589399B2 (ja) | 2010-01-21 | 2010-01-21 | 液面検出装置の製造方法、及び液面検出装置 |
JP2010-011288 | 2010-01-21 |
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JP (1) | JP5589399B2 (ja) |
KR (1) | KR20120127420A (ja) |
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JP6061137B2 (ja) * | 2013-01-21 | 2017-01-18 | 日本精機株式会社 | 液面検出装置 |
JP6119644B2 (ja) * | 2014-03-07 | 2017-04-26 | 株式会社デンソー | 液面検出装置用の可変抵抗器板、可変抵抗器板の製造方法、液面検出装置 |
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2010
- 2010-01-21 JP JP2010011288A patent/JP5589399B2/ja active Active
-
2011
- 2011-01-17 EP EP11734598.3A patent/EP2527806A4/en not_active Withdrawn
- 2011-01-17 CN CN2011800068051A patent/CN102762961A/zh active Pending
- 2011-01-17 IN IN6452DEN2012 patent/IN2012DN06452A/en unknown
- 2011-01-17 WO PCT/JP2011/050639 patent/WO2011089992A1/ja active Application Filing
- 2011-01-17 KR KR1020127019025A patent/KR20120127420A/ko not_active Application Discontinuation
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JP2011149818A (ja) | 2011-08-04 |
EP2527806A4 (en) | 2016-10-12 |
IN2012DN06452A (ja) | 2015-10-09 |
KR20120127420A (ko) | 2012-11-21 |
CN102762961A (zh) | 2012-10-31 |
EP2527806A1 (en) | 2012-11-28 |
JP5589399B2 (ja) | 2014-09-17 |
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