JPH0921677A - Liquid level sensor and liquid level detector - Google Patents
Liquid level sensor and liquid level detectorInfo
- Publication number
- JPH0921677A JPH0921677A JP7169074A JP16907495A JPH0921677A JP H0921677 A JPH0921677 A JP H0921677A JP 7169074 A JP7169074 A JP 7169074A JP 16907495 A JP16907495 A JP 16907495A JP H0921677 A JPH0921677 A JP H0921677A
- Authority
- JP
- Japan
- Prior art keywords
- liquid level
- liquid
- level sensor
- oil
- detection device
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えばエンジンあ
るいはトランスミッションの潤滑油の量を判断するため
の液面レベルを検出する液面検知装置および液面検出装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid level detecting device and a liquid level detecting device for detecting a liquid level for determining the amount of lubricating oil in an engine or a transmission, for example.
【０００２】[0002]
【従来の技術】従来、例えば自動車のエンジンあるいは
トランスミッションの潤滑油の量を判断するための液面
レベルを検出する液面検知装置としては、図８および図
９に示す構成が知られている。2. Description of the Related Art Conventionally, as a liquid level detecting device for detecting a liquid level for judging the amount of lubricating oil of an automobile engine or a transmission, for example, the configurations shown in FIGS. 8 and 9 are known.
【０００３】この図８および図９に示す液面検知装置
は、一端側に指が引っ掛けられるように環状に屈曲した
金属線の把持部61の他端側に、弾性を有する金属ワイヤ
ー製の接続部62を取り付け、この接続部62の先端に金属
平板状で一面に目盛63a を設けた検出部63を有してい
る。The liquid level detection device shown in FIGS. 8 and 9 has a connection made of an elastic metal wire on the other end side of a grip portion 61 of a metal wire bent in an annular shape so that a finger can be hooked on one end side. The portion 62 is attached, and the connecting portion 62 has a detecting portion 63 at the tip thereof which is a flat metal plate and has a scale 63a on one surface.
【０００４】また、この液面検知装置64は、把持部61と
接続部62との間に位置決め手段65を有し、この位置決め
手段65は、略円柱状の一端面に把持部61の軸方向に対し
て略垂直な当接面66を有した胴体部67と、この胴体部67
の当接面66に断面波状のシール部68とをゴムにて一体形
成し、把持部61に嵌着固定している。Further, the liquid level detection device 64 has a positioning means 65 between the grip portion 61 and the connecting portion 62, and the positioning means 65 has a substantially cylindrical end surface in the axial direction of the grip portion 61. A body portion 67 having an abutment surface 66 substantially perpendicular to the body portion 67;
A seal portion 68 having a corrugated cross section is integrally formed of rubber on the contact surface 66 of and is fitted and fixed to the grip portion 61.
【０００５】一方、70はオイルパンで、このオイルパン
70は、内部にエンジン用あるいはオートマチックトラン
スミッション用のオイル71を収容し、一側面から上方に
屈曲して導出する導出管72を有し、この導出管72は、上
端に点検口73を開口し、下端がオイルパン70内に連続す
る管状に形成されている。On the other hand, 70 is an oil pan.
70 contains oil 71 for engine or automatic transmission inside, and has a lead-out pipe 72 that is bent upward from one side face and led out, and this lead-out pipe 72 opens an inspection port 73 at the upper end, The lower end is formed in a continuous tubular shape inside the oil pan 70.
【０００６】そして、液面検知装置64を、検出部63を点
検口73から導出管72を介してオイルパン70内に挿入して
オイル71に先端部を浸漬させ、シール部68が導出管72の
上端部近傍の内周面に液密に当接させ、胴体部67の当接
面66を導出管72の上端の点検口73の周縁に当接させて、
導出管72に支持させる。Then, the liquid level detection device 64 is inserted into the oil pan 70 from the inspection port 73 through the inspection pipe 73 and the outlet pipe 72 to immerse the tip portion in the oil 71, and the seal portion 68 is connected to the outlet pipe 72. Liquid-tightly contact the inner peripheral surface near the upper end of the, the contact surface 66 of the body 67 abuts the periphery of the inspection port 73 at the upper end of the outlet pipe 72,
The lead-out pipe 72 is supported.
【０００７】また、オイル71の量を測定する場合には、
導出管72に支持されている液面検知装置64を把持部61の
環状部分に指を引っ掛けて引き抜き、オイル71で濡れて
いる引き出した検出部63を布切れなどで一旦拭き取り、
再び液面検知装置64を位置決め手段65の当接面66が導出
管72の上端縁に当接するまで、検出部63をオイルパン70
内に挿入させる。そして、再び液面検知装置64を引き抜
き、検出部63のオイル71で濡れている境界線を、検出部
63に設けた目盛63a と対比させ、オイルパン70内のオイ
ル71の液面を判断してオイル71の量を判断する。When measuring the amount of oil 71,
The liquid level detection device 64 supported by the outlet pipe 72 is pulled out by hooking the finger to the annular portion of the grip 61, and the detection unit 63 that is wet with the oil 71 is wiped off once with a piece of cloth,
Again, until the contact surface 66 of the positioning means 65 of the liquid level detection device 64 contacts the upper end edge of the outlet pipe 72, the detection portion 63 is moved to the oil pan 70.
Insert into. Then, the liquid level detection device 64 is pulled out again, and the boundary line wet with the oil 71 of the detection unit 63 is detected by the detection unit.
The amount of the oil 71 is judged by judging the liquid level of the oil 71 in the oil pan 70 in comparison with the scale 63a provided on the 63.
【０００８】[0008]
【発明が解決しようとする課題】ところで、例えば自動
車の出荷の際には、オイル71の量の測定は、検出部63の
オイル71で濡れた境界線の位置をmm単位の目盛が設けら
れたものさしなどの測定器により測定して確認してい
る。By the way, when the amount of the oil 71 is measured, for example, when the automobile is shipped, the position of the boundary line wet with the oil 71 of the detection unit 63 is provided with a scale in mm. It is confirmed by measuring with a measuring instrument such as a ruler.
【０００９】このため、上記従来の液面検知装置64によ
りオイル71の量を測定する場合には、液面検知装置64を
２度抜き差ししなければならず、測定作業が煩雑である
とともに、オイル71で濡れた境界線をものさしなどで測
定する際、オイル71は比較的表面張力が小さいため、そ
の境界線がはっきりせず、また、液面検知装置64を引き
抜く際に、検出部63が導出管72の内部に当接して境界線
がにじみ、mm単位の測定に誤差が生じ易い問題がある。
そして、このオイル71の量の測定によりオイル71を補充
または引き抜く場合には、専用のオイル給排装置を用い
なければならず作業が煩雑である。Therefore, when the amount of the oil 71 is measured by the conventional liquid level detection device 64, the liquid level detection device 64 must be inserted and removed twice, which complicates the measurement work and causes the oil When measuring the boundary line wet with 71 with a ruler, since the oil 71 has a relatively small surface tension, the boundary line is not clear, and when the liquid level detection device 64 is pulled out, the detection unit 63 derives it. There is a problem that the boundary line bleeds by coming into contact with the inside of the pipe 72, and an error easily occurs in measurement in mm.
When replenishing or withdrawing the oil 71 by measuring the amount of the oil 71, a dedicated oil supply / drainage device must be used and the work is complicated.
【００１０】また、車種によって導出管72の長さが異な
るため、それぞれの導出管72に対応した液面検知装置64
が必要で、汎用性が低い問題も有している。Further, since the length of the outlet pipe 72 is different depending on the vehicle type, the liquid level detecting device 64 corresponding to each outlet pipe 72.
However, it has a problem of low versatility.
【００１１】本発明は、上記問題点に鑑みなされたもの
で、液面の測定および液体の給排が容易で、また、汎用
性が高い液面検知装置および液面検出装置を提供するこ
とを目的とするものである。The present invention has been made in view of the above problems, and it is an object of the present invention to provide a liquid level detection device and a liquid level detection device which are easy to measure the liquid level and supply / drain the liquid and have high versatility. It is intended.
【００１２】[0012]
【課題を解決するための手段】請求項１記載の液面検知
装置は、筒状の外部電極、および、この外部電極に対し
て絶縁間隙を介してこの外部電極内に略同軸上に設けら
れた筒状の内部電極を備え誘電性を有する液体内に挿入
される液面センサと、この液面センサに接続され前記内
部電極の内周に連通し前記液体が流通可能な液流路およ
び前記絶縁間隙に連通し空気が流通可能な通気路を備え
た把持部と、この把持部に設けられ前記液体を貯溜する
タンクに形成された開口部の縁に当接し液面センサの位
置を所定位置に設定する位置決め手段とを具備したもの
で、把持部に接続された液面センサを液体内に把持部の
位置決め手段により所定位置に挿入し、筒状の外部電極
内の軸方向に沿って設けた筒状の内部電極と外部電極と
の間の絶縁間隙に流入する液体の位置によって静電容量
が変化して電位が変化し、この電位を測定することによ
り検知した液位により、液体を給排する場合に通気路を
介して空気調整しつつ適宜把持部の液流路を介して液体
を給排するため、液面センサを液体に挿入するのみで短
時間で高精度に液面位置が容易に検知可能であるととも
に、液面センサを液体中に挿入したままで液体の所定量
の給排が可能である。According to another aspect of the present invention, there is provided a liquid level detection device, which is provided substantially coaxially with a cylindrical external electrode and the external electrode with an insulating gap therebetween. A liquid level sensor having a cylindrical internal electrode and inserted into a liquid having a dielectric property, a liquid flow path that is connected to the liquid level sensor and communicates with the inner circumference of the internal electrode, and through which the liquid can flow. A grip part having an air passage communicating with the insulating gap and through which air can flow, and an edge of an opening formed in the grip part for storing the liquid are brought into contact with each other to position the liquid level sensor at a predetermined position. The liquid level sensor connected to the gripping portion is inserted into the liquid at a predetermined position by the positioning means of the gripping portion, and is provided along the axial direction in the cylindrical external electrode. The insulating gap between the cylindrical inner electrode and the outer electrode The capacitance changes depending on the position of the entering liquid, and the potential changes, and the liquid level detected by measuring this potential adjusts the air through the ventilation passage when supplying or discharging the liquid, and appropriately grasps the holding part. Since the liquid is supplied and discharged through the liquid flow path of, the liquid level sensor can be easily detected in a short time with high accuracy simply by inserting the liquid level sensor into the liquid, and the liquid level sensor can be inserted into the liquid. It is possible to supply and discharge a predetermined amount of liquid as it is.
【００１３】請求項２記載の液面検知装置は、請求項１
記載の液面検知装置において、把持部は、液面センサを
弾性を有する管状の接続部を介して接続したもので、例
えば液面の検知箇所が屈曲する場合でも、接続部を液面
の検知箇所の屈曲に対応して屈曲させて液面センサを液
体内に挿入するのみで、短時間で高精度に液面位置が容
易に検知可能で、管状の接続部の内部から液流路を介し
て液体の給排が行えるとともに、例えば液面センサのリ
ード線を処理する場合、リード線を接続部内に配設可能
で、リード線が露出することなく液面の検知箇所の摩擦
や屈曲などによるリード線の損傷が防止される。According to a second aspect of the present invention, there is provided a liquid level detection device according to the first aspect.
In the liquid level detection device according to the description, the grip is a liquid level sensor connected through a tubular connecting portion having elasticity. For example, even when the liquid level detecting portion bends, the connecting portion detects the liquid level. The liquid level sensor can be easily detected with high accuracy in a short time by simply bending the liquid level sensor and inserting the liquid level sensor into the liquid. The liquid can be supplied and drained with the liquid level sensor, and when processing the lead wire of the liquid level sensor, for example, the lead wire can be placed inside the connection part, and the lead wire is not exposed and friction or bending at the liquid level detection point Lead wire damage is prevented.
【００１４】請求項３記載の液面検知装置は、請求項１
または２記載の液面検知装置において、把持部は長手状
で、位置決め手段はこの把持部の長手方向に沿って摺動
可能であるもので、位置決め手段を摺動移動させるのみ
で、液面の検知箇所を問わず液面を容易で高精度に検知
可能となり、汎用性が向上する。A liquid level detection device according to a third aspect of the present invention is the liquid level detection device according to the first aspect.
Alternatively, in the liquid level detecting device according to the second aspect, the gripping portion has a long shape, and the positioning means is slidable along the longitudinal direction of the gripping portion. The liquid level can be detected easily and with high accuracy regardless of the detection location, improving versatility.
【００１５】請求項４記載の液面検出装置は、請求項１
ないし３いずれか記載の液面検知装置と、電源手段によ
り液面センサの外部電極および内部電極間に印加された
電圧に基づき前記外部電極および前記内部電極間の静電
容量を検出する静電容量検出手段と、この静電容量検出
手段で検出された静電容量に基づき液位を検知する液面
検知手段と、この液面検知手段で検知した液位に対応し
て把持部の液流路を介して液体を給液または排液する液
体給排手段とを具備したもので、請求項１ないし３いず
れか記載の液面検知装置の液面センサを液体内に挿入
し、電源手段により液面センサの外部電極および内部電
極間に印加された電圧に基づき外部電極および内部電極
間の静電容量を静電容量検出手段にて検出し、この静電
容量検出手段で検出した静電容量に基づき液面検知手段
により液位を検知するとともに、この液面検知手段で検
知した液位に基づいて適宜液体給排手段にて把持部の液
流路を介して液体を給液または排液するため、液面セン
サを位置決め手段にて所定位置となるように液体内に挿
入するのみで、短時間で高精度に液面位置が容易に検知
可能となるとともに、液面センサを液体中に挿入したま
まで液体の給排により液体を所定量に維持可能である。A liquid level detecting device according to a fourth aspect is the first aspect.
3. A liquid level detecting device according to any one of 3 to 3, and a capacitance for detecting a capacitance between the external electrode and the internal electrode based on a voltage applied between the external electrode and the internal electrode of the liquid level sensor by a power supply means. Detection means, liquid level detection means for detecting the liquid level based on the electrostatic capacitance detected by the electrostatic capacitance detection means, and the liquid flow path of the gripping portion corresponding to the liquid level detected by the liquid level detection means A liquid level sensor for supplying or discharging the liquid via the liquid level sensor, wherein the liquid level sensor of the liquid level sensor according to any one of claims 1 to 3 is inserted into the liquid, and the liquid is supplied by the power source means. Based on the voltage applied between the external and internal electrodes of the surface sensor, the electrostatic capacitance between the external and internal electrodes is detected by the electrostatic capacitance detection means, and the electrostatic capacitance detected by this electrostatic capacitance detection means is used. Based on the liquid level detection means, the liquid level is detected. At the same time, since the liquid is supplied or drained through the liquid flow path of the grip portion by the liquid supply / discharge means based on the liquid level detected by the liquid level detection means, the liquid level sensor is set by the positioning means. The liquid level position can be easily detected with high accuracy in a short time by simply inserting the liquid into the liquid so that the liquid level sensor can be used by supplying and discharging the liquid with the liquid level sensor inserted in the liquid. It can be maintained at a fixed level.
【００１６】請求項５記載の液面検出装置は、請求項４
記載の液面検出装置において、液面センサ近傍に取り付
けられ液体の温度を検出する温度検出手段と、この温度
検出手段で検出された液面の温度に基づき液面検知手段
で検知された液位を補正する温度補正手段とを具備した
もので、液面センサ近傍に取り付けられた温度検出手段
にて液体の温度を検出し、この温度検出手段で検出した
液体の温度に基づき温度補正手段により液面検知手段で
検知した液位を補正するため、温度により液体の誘電率
が変化するなどしても短時間で高精度に液面位置が容易
に検知可能となる。According to a fifth aspect of the present invention, there is provided a liquid level detection device according to the fourth aspect.
In the liquid level detection device described above, a temperature detection means mounted near the liquid level sensor to detect the temperature of the liquid, and a liquid level detected by the liquid level detection means based on the temperature of the liquid level detected by the temperature detection means. Temperature detecting means for correcting the temperature of the liquid is detected by the temperature detecting means mounted in the vicinity of the liquid level sensor, and the liquid temperature is corrected by the temperature correcting means based on the temperature of the liquid detected by the temperature detecting means. Since the liquid level detected by the surface detection means is corrected, the liquid surface position can be easily detected with high accuracy in a short time even if the dielectric constant of the liquid changes with temperature.
【００１７】[0017]
【発明の実施の形態】以下、本発明の液面検出装置の実
施の一形態の構成を図面を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION A configuration of an embodiment of a liquid level detecting device of the present invention will be described below with reference to the drawings.
【００１８】図２において、１は例えば自動車のエンジ
ンの下部に設けられるタンクとしてのオイルパンで、こ
のオイルパン１は金属製で略箱状に形成され、内部にエ
ンジン用あるいはオートマチックトランスミッション用
の誘電性を有する液体であるオイル２を収容するように
なっている。そして、このオイルパン１の上面には、図
示しない自動車のエンジン室内の他の部品に干渉しない
ように上方に屈曲して導出管３が突出形成されている。
また、この導出管３は、上端に開口部である点検口４が
開口され下端がオイルパン１内に連続する管状に形成さ
れている。In FIG. 2, reference numeral 1 denotes an oil pan as a tank provided in the lower part of an engine of an automobile, for example. The oil pan 1 is made of metal and formed into a substantially box shape, and has an internal dielectric for an engine or an automatic transmission. The oil 2 which is a liquid having a property is contained. A lead-out pipe 3 is formed on the upper surface of the oil pan 1 so as to be bent upward so as not to interfere with other parts in the engine compartment of an automobile (not shown).
Further, the outlet pipe 3 is formed in a tubular shape in which an inspection port 4 which is an opening is opened at the upper end and the lower end is continuous in the oil pan 1.
【００１９】一方、６は液面検知装置本体で、この液面
検知装置本体６は、図１ないし図３に示すように、例え
ば合成樹脂や硬質のゴム製で中心軸に円筒状に開口する
液流路7aが設けられた円筒状の把持部７を有している。
また、この把持部７には、液流路7aを介して液流路7aの
直径方向に位置する円筒状に開口する通気路7bと配線孔
7cとがそれぞれ設けられている。さらに、把持部７の軸
方向の一端には、先端部に向けて径小となるテーパ部7d
が設けられている。On the other hand, 6 is a liquid level detection device main body, and this liquid level detection device main body 6 is made of, for example, synthetic resin or hard rubber and is opened in a cylindrical shape in the central axis as shown in FIGS. It has a cylindrical grip portion 7 provided with a liquid flow path 7a.
Further, in this grip portion 7, a ventilation passage 7b and a wiring hole which are opened in a cylindrical shape and are located in the diameter direction of the liquid flow passage 7a via the liquid flow passage 7a.
7c and 7c are provided respectively. Further, at one end of the grip portion 7 in the axial direction, a taper portion 7d having a smaller diameter toward the tip portion is formed.
Is provided.
【００２０】また、把持部７のテーパ部7dが設けられた
側の端部には、把持部７の外径より径小の円筒状の第１
の連結部8aが同軸上に一体的に形成され、この第１の連
結部8aの先端部にはこの第１の連結部8aの外径より径小
の第２の連結部8bが同軸上に一体的に設けられている。
そして、第１の連結部8aには把持部７の液流路7a、通気
路7bおよび配線孔7cが連通し、第２の連結部8bには液流
路7aのみ連通し、第１の連結部8aを貫通する通気路7bお
よび配線孔7cの端部は第２の連結部8bの基端の第１の連
結部8aの先端面に開口している。At the end of the grip portion 7 on the side where the taper portion 7d is provided, a cylindrical first member having a diameter smaller than the outer diameter of the grip portion 7 is provided.
Connecting portion 8a is integrally formed on the same axis, and a second connecting portion 8b having a diameter smaller than the outer diameter of the first connecting portion 8a is coaxially formed on the tip portion of the first connecting portion 8a. It is provided integrally.
Then, the liquid passage 7a, the ventilation passage 7b and the wiring hole 7c of the grip portion 7 communicate with the first connecting portion 8a, and only the liquid passage 7a communicates with the second connecting portion 8b. The air passage 7b penetrating the portion 8a and the end of the wiring hole 7c are open to the tip surface of the first connecting portion 8a at the base end of the second connecting portion 8b.
【００２１】さらに、把持部７の一端側の外周面には、
鍔状に突出形成された位置決め手段としてのフランジ部
９が形成され、このフランジ部９の第１および第２の連
結部8a，8bが突出する側に導出管３の点検口４の周縁に
当接する当接面10が形成されている。Further, on the outer peripheral surface of the grip portion 7 on one end side,
A flange portion 9 is formed as a positioning means and is formed in a flange shape. The flange portion 9 is provided with a flange portion 9 on the side where the first and second connecting portions 8a and 8b protrude to contact the peripheral edge of the inspection port 4 of the lead-out pipe 3. A contact surface 10 that contacts is formed.
【００２２】そして、把持部７のフランジ部９の当接面
10側の端部には、液面センサ12が設けられている。この
液面センサ12は、図１ないし図３に示すように、略円筒
状の外部電極14とこの外部電極14内に略同軸上に設けら
れた内部電極15とから構成されている。そして、外部電
極14は、例えば真鍮やアルミニウム合金などの導電性材
料が含有された合成樹脂からなる可撓性を有した細長円
筒状に形成され、この外部電極14の外周面には軸方向に
沿って略等間隔に目盛が記された図示しない液面検査目
視用目盛が設けられている。さらに、外部電極14の内周
面側には、軸方向の適宜位置に絶縁性の合成樹脂やゴム
などの材料からなる略環状の固定部16，16が複数設けら
れている。The contact surface of the flange portion 9 of the grip portion 7
A liquid level sensor 12 is provided at the end on the 10 side. As shown in FIGS. 1 to 3, the liquid level sensor 12 is composed of a substantially cylindrical outer electrode 14 and an inner electrode 15 provided substantially coaxially inside the outer electrode 14. The external electrode 14 is formed in the shape of a flexible elongated cylinder made of a synthetic resin containing a conductive material such as brass or aluminum alloy, and the outer surface of the external electrode 14 is formed in the axial direction. Liquid level inspection visual scales (not shown) are provided along the scales at substantially equal intervals. Further, on the inner peripheral surface side of the outer electrode 14, a plurality of substantially annular fixing portions 16, 16 made of a material such as insulating synthetic resin or rubber are provided at appropriate positions in the axial direction.
【００２３】一方、内部電極15は、外部電極14と同材質
にて外部電極14より径小の細長円筒状に形成され、内周
面には合成樹脂や硬質ゴムなどの絶縁性材料からなる被
覆管17が設けられている。そして、この内部電極15は、
外部電極14に設けられた固定部16，16の内周に嵌合固定
されて、外周面が外部電極14の内周面と絶縁間隙19を介
して外部電極14内に同軸上に位置決め固定されている。
なお、固定部16の外周面には凹部20が設けられ、この凹
部20により外部電極14の内周面との間に隙間が生じ、こ
の隙間が絶縁間隙19内に液体が流入可能となる流通孔21
となる。On the other hand, the inner electrode 15 is formed in the shape of an elongated cylinder having the same material as that of the outer electrode 14 and a smaller diameter than the outer electrode 14, and the inner peripheral surface is covered with an insulating material such as synthetic resin or hard rubber. A pipe 17 is provided. And this internal electrode 15 is
The outer peripheral surface is coaxially positioned and fixed in the outer electrode 14 via the insulating gap 19 with the inner peripheral surface of the outer electrode 14 by being fitted and fixed to the inner periphery of the fixing portions 16 and 16 provided on the outer electrode 14. ing.
A concave portion 20 is provided on the outer peripheral surface of the fixed portion 16, and a gap is formed between the concave portion 20 and the inner peripheral surface of the external electrode 14, and the gap allows the liquid to flow into the insulating gap 19. Hole 21
Becomes
【００２４】そして、把持部７の第２の連結部8bに内部
電極15の端部が嵌合固定されるとともに、把持部７の第
１の連結部8aに外部電極14の端部が嵌合固定されて、把
持部７の端部に液面センサ12が接続される。この接続に
より、把持部７の液流路7aは内部電極15の内周側に連通
し、通気路7bおよび配線孔7cは外部電極14および内部電
極15間の絶縁間隙19に連通している。Then, the end portion of the internal electrode 15 is fitted and fixed to the second connecting portion 8b of the grip portion 7, and the end portion of the external electrode 14 is fitted to the first connecting portion 8a of the grip portion 7. The liquid level sensor 12 is fixed and connected to the end of the grip 7. By this connection, the liquid flow path 7a of the grip portion 7 communicates with the inner peripheral side of the internal electrode 15, and the ventilation path 7b and the wiring hole 7c communicate with the insulating gap 19 between the external electrode 14 and the internal electrode 15.
【００２５】また、液面センサ12の外部電極14の把持部
７側の端部の内周面および内部電極15の把持部７側の端
部の外周面には、把持部７の配線孔7cの内部を通って配
線された一対のシールド線22a ，22a にて構成されたリ
ード線22がそれぞれ半田付けなどにより接続されてい
る。Further, the wiring hole 7c of the grip portion 7 is formed on the inner peripheral surface of the end portion of the external electrode 14 of the liquid level sensor 12 on the grip portion 7 side and the outer peripheral surface of the end portion of the internal electrode 15 on the grip portion 7 side. A lead wire 22 composed of a pair of shielded wires 22a, 22a wired through the inside of is connected to each other by soldering or the like.
【００２６】そして、リード線22の把持部７の端部から
導出する側の端部には、図示しないコネクタが設けら
れ、これらコネクタは制御装置24に接続されるようにな
っている。また、制御装置24には電動ポンプ25が接続さ
れ、この電動ポンプ25には、オイル２を貯溜する予備タ
ンク26および液面検知装置本体６の把持部７の液流路7a
に可撓性を有する搬送管27を介して接続され、これら電
動ポンプ25、予備タンク26および搬送管27にて液体給排
手段28が構成されている。そして、液面検知装置本体６
が制御装置24に接続されるとともに、搬送管27を介して
液面検知装置本体６および予備タンク26が接続された電
動ポンプ25が制御装置24に接続されて液面検出装置本体
29が構成される。Then, connectors (not shown) are provided at the ends of the lead wires 22 extending from the ends of the grip portion 7, and these connectors are connected to the controller 24. Further, an electric pump 25 is connected to the control device 24, and the electric pump 25 has a reserve tank 26 for storing the oil 2 and a liquid flow path 7a of the grip portion 7 of the liquid level detection device body 6.
Are connected to each other via a flexible transfer pipe 27, and the electric pump 25, the auxiliary tank 26, and the transfer pipe 27 constitute a liquid supply / drainage means 28. Then, the liquid level detection device body 6
Is connected to the control device 24, and the liquid level detection device main body 6 and the auxiliary tank 26 are connected via the transfer pipe 27 to the electric pump 25 connected to the control device 24.
29 are composed.
【００２７】また、予備タンク26には、内部のオイル２
の補充および排出が可能な給油孔30が設けられ、この給
油孔30を開閉可能に給油蓋31が設けられている。そし
て、この給油蓋31には、内部に貯溜するオイル２の量の
変化により内圧の変化に対応して給排気可能なガス抜き
孔32が設けられている。In addition, the oil 2 inside the spare tank 26
A refueling hole 30 is provided for replenishing and discharging, and a refueling lid 31 is provided for opening and closing the refueling hole 30. The refueling lid 31 is provided with a gas vent hole 32 capable of supplying and exhausting gas in response to a change in internal pressure due to a change in the amount of oil 2 stored inside.
【００２８】一方、制御装置24は、電源手段、静電容量
検出手段および液面検知手段としての機能を有し、図４
に示すように、ＣＰＵ（Central Processing Unit ）が
設けられた制御回路34と、この制御回路34に接続された
Ａ／Ｄコンバータ35（アナログ−デジタル変換装置）と
から構成されている。On the other hand, the controller 24 has a function as a power source means, an electrostatic capacitance detecting means, and a liquid level detecting means, and FIG.
As shown in, a control circuit 34 provided with a CPU (Central Processing Unit) and an A / D converter 35 (analog-digital conversion device) connected to the control circuit 34 are included.
【００２９】そして、制御回路34には、表示部36が接続
され、この表示部36は、図示しないコネクタを介して接
続された液面検知装置本体６の外部電極14および内部電
極15間の静電容量の電位を制御回路34により処理した結
果を表示するようになっており、表示部36は、例えば複
数の発光ダイオードからなるバー表示式の液面レベル表
示部36a 、液晶による数値表示式の液面レベル表示部36
b を設けている。なお、処理されたデータは、インター
フェース37（RS232C）を介して接続されたパーソナルコ
ンピュータなどの演算記憶装置38により、液面検知装置
本体６により複数測定された結果を処理・記憶などをさ
せることも可能である。A display unit 36 is connected to the control circuit 34, and the display unit 36 connects the external electrode 14 and the internal electrode 15 of the liquid level detection device body 6 connected via a connector (not shown). The result of processing the electric potential of the capacitance by the control circuit 34 is displayed, and the display unit 36 is, for example, a bar display type liquid level level display unit 36a composed of a plurality of light emitting diodes, or a numerical display type liquid crystal display. Liquid level display 36
b is provided. The processed data may be processed and stored by the arithmetic storage device 38 such as a personal computer connected via the interface 37 (RS232C) to process and store a plurality of results measured by the liquid level detection device body 6. It is possible.
【００３０】次に、上記実施の一形態の動作を説明す
る。Next, the operation of the above embodiment will be described.
【００３１】例えば図示しない自動車の出荷前の諸検査
におけるオイル２の量を検査する際、まず、商用交流電
源39が供給された制御装置24に液面検知装置本体６を接
続し、制御装置24の図示しない電源スイッチを閉成す
る。なお、この電源スイッチの閉成により、外部電極14
にリード線22を介して制御装置24から定周波数の交流電
圧が印加される。For example, when inspecting the amount of oil 2 in various inspections before shipment of an automobile (not shown), first, the liquid level detection device body 6 is connected to the control device 24 to which the commercial AC power source 39 is supplied, and the control device 24 is operated. The power switch (not shown) is closed. By closing this power switch, the external electrode 14
A constant-frequency AC voltage is applied from the control device 24 via the lead wire 22.
【００３２】次に、制御装置24に接続された液面検知装
置本体６を、液面センサ12を点検口４から導出管３を介
して挿入し、フランジ部９の当接面10が導出管３の上端
の点検口４の周縁に当接するまで挿入する。なお、この
挿入の際、液面センサ12を構成する外部電極14および内
部電極15は弾性を有するため、屈曲する導出管３の屈曲
に対応して屈曲し、液面センサ12はオイルパン１内に挿
入されてオイル２に浸漬される。Next, the liquid level detection device body 6 connected to the control device 24 is inserted from the inspection port 4 through the lead-out pipe 3, and the contact surface 10 of the flange 9 is led out. Insert it until it contacts the peripheral edge of the inspection port 4 at the upper end of 3. In addition, at the time of this insertion, since the external electrode 14 and the internal electrode 15 forming the liquid level sensor 12 have elasticity, the liquid level sensor 12 bends in response to the bending of the bent lead-out pipe 3, and the liquid level sensor 12 moves inside the oil pan 1. And is immersed in oil 2.
【００３３】そして、この液面センサ12の浸漬により、
把持部７の通気路7bから外部電極14と内部電極15との間
の絶縁間隙19内の空気などが排気されるとともに、固定
部16の凹部20による流通孔21を介してオイル２が外部電
極14の先端側のから絶縁間隙19に浸入する。この外部電
極14および内部電極15間に浸入したオイル２により、外
部電極14および内部電極15間の誘電率による静電容量の
電位がリード線22を介して制御装置24に伝送される。By soaking the liquid level sensor 12,
The air or the like in the insulating gap 19 between the external electrode 14 and the internal electrode 15 is exhausted from the ventilation passage 7b of the grip portion 7, and the oil 2 is supplied to the external electrode through the flow hole 21 formed by the recess 20 of the fixing portion 16. It penetrates into the insulating gap 19 from the tip side of 14. The oil 2 that has penetrated between the external electrode 14 and the internal electrode 15 transmits the electric potential of the electrostatic capacitance due to the dielectric constant between the external electrode 14 and the internal electrode 15 to the control device 24 via the lead wire 22.
【００３４】さらに、この液面センサ12からの静電容量
の電位が、制御装置24の制御回路34にて表示部36で表示
されるとともに、Ａ／Ｄコンバータ35によりデジタル信
号に変換されてインターフェース37を介して演算記憶装
置38に伝送され、演算記憶装置38で各種処理および記録
を行う。Further, the potential of the electrostatic capacitance from the liquid level sensor 12 is displayed on the display unit 36 by the control circuit 34 of the control unit 24 and converted into a digital signal by the A / D converter 35 to interface. It is transmitted to the arithmetic storage device 38 via 37, and various processing and recording are performed in the arithmetic storage device 38.
【００３５】そして、制御装置24の制御回路34は、液面
センサ12からの静電容量の電位が所定の範囲内でないこ
とを検知し、オイル２の量が所定量より多いまたは少な
いことを認識した際、オイル２の量が多い場合には、電
動ポンプ25を駆動させてオイルパン１内のオイル２を内
部電極15から把持部７の液流路7aおよび搬送管27を介し
て予備タンク26に引き抜く。また、オイル２の量が少な
い場合には、電動ポンプ25を駆動させて予備タンク26内
のオイル２を搬送管27から把持部７の液流路7a、内部電
極15内を介してオイルパン１に補充する。なお、内部電
極15の内周面には、絶縁性の被覆管17が設けられている
ため、オイル２の給排の際に液面センサ12の電位が変動
することを防止できる。そして、オイル２の補充または
排出が所定量となると、液面センサ12からの静電容量の
電位が所定値となり、制御装置24の制御回路34は電動ポ
ンプ25の駆動を停止し、自動的にオイル２の給排が行わ
れる。Then, the control circuit 34 of the control device 24 detects that the electrostatic potential from the liquid level sensor 12 is not within the predetermined range, and recognizes that the amount of the oil 2 is larger or smaller than the predetermined amount. At this time, when the amount of oil 2 is large, the electric pump 25 is driven to move the oil 2 in the oil pan 1 from the internal electrode 15 to the auxiliary tank 26 via the liquid flow path 7a of the grip 7 and the transfer pipe 27. Pull out. When the amount of the oil 2 is small, the electric pump 25 is driven to move the oil 2 in the auxiliary tank 26 from the carrier pipe 27 through the liquid flow path 7a of the grip 7 and the internal electrode 15 to the oil pan 1. To replenish. Since the insulating coating tube 17 is provided on the inner peripheral surface of the internal electrode 15, it is possible to prevent the potential of the liquid level sensor 12 from changing when the oil 2 is supplied or discharged. When the oil 2 is replenished or discharged by a predetermined amount, the electrostatic potential from the liquid level sensor 12 reaches a predetermined value, and the control circuit 34 of the control device 24 stops the driving of the electric pump 25 and automatically. The oil 2 is supplied and discharged.
【００３６】したがって、上記実施の一形態によれば、
液面センサ12をオイルパン１内のオイル２に浸漬させる
のみで、液位を短時間で高精度に検知できるとともに、
この液位の検知により液面センサ12をオイル２中に挿入
したままでオイル２の給排ができ、作業性が向上でき
る。Therefore, according to the above embodiment,
By only immersing the liquid level sensor 12 in the oil 2 in the oil pan 1, the liquid level can be detected with high accuracy in a short time, and
By detecting the liquid level, the oil 2 can be supplied and discharged while the liquid level sensor 12 is still inserted in the oil 2, and the workability can be improved.
【００３７】また、液面センサ12を可撓性を有する外部
電極14および内部電極15にて形成したため、リード線22
を内部に収容でき外部に露出することにより外観が損な
われることがなく、導出管３への挿入の際の摩擦による
リード線22の損傷を防止できる。さらに、導出管３の屈
曲に対応して液面センサ12が屈曲するので導出管３の屈
曲状態を問わずに測定できる。Since the liquid level sensor 12 is formed of the flexible external electrode 14 and internal electrode 15, the lead wire 22
Can be housed inside and exposed to the outside so that the appearance is not impaired, and the lead wire 22 can be prevented from being damaged by friction during insertion into the lead-out tube 3. Furthermore, since the liquid level sensor 12 bends in response to the bending of the lead-out pipe 3, it is possible to perform measurement regardless of the bent state of the lead-out pipe 3.
【００３８】次に、本発明の液面検出装置の実施の他の
形態を図面を参照して説明する。Next, another embodiment of the liquid level detecting device of the present invention will be described with reference to the drawings.
【００３９】図５ないし図７に示す液面検知装置本体41
は、図１ないし図４に示す液面検知装置本体６と同様
に、図示しない液流路、通気路および配線孔が設けられ
た円筒状の把持部42を有している。そして、この把持部
７の外周面には、位置目盛43が軸方向に沿って所定の間
隔で設けられている。Liquid level detection device main body 41 shown in FIGS.
Like the liquid level detection device main body 6 shown in FIGS. 1 to 4, has a cylindrical grip portion 42 provided with a liquid flow path, a ventilation path, and a wiring hole (not shown). Position marks 43 are provided on the outer peripheral surface of the grip portion 7 at predetermined intervals along the axial direction.
【００４０】また、この把持部42には、例えば合成樹脂
やゴム製の円筒状の位置決め手段としての鍔部44が摺動
自在に嵌合して設けられ、この鍔部44には、軸方向の一
端面に軸方向に対して略垂直に設けられ導出管３の点検
口４の周縁に当接する当接面45が形成されている。A collar portion 44, which is made of, for example, synthetic resin or rubber and serves as a cylindrical positioning means, is slidably fitted to the grip portion 42. The collar portion 44 has an axial direction. An abutting surface 45 is formed on one end surface of the abutting member substantially perpendicularly to the axial direction and abuts on the peripheral edge of the inspection port 4 of the outlet pipe 3.
【００４１】さらに、把持部42には、金属製のスパイラ
ル状のフレキシブルチューブや耐熱合成樹脂のフレキシ
ブルチューブなどの弾性を有した接続部46が接続されて
いる。そして、この接続部46は、図示しない弾性を有す
る細長円筒状の内周管および同材質の細長円筒状の外周
管46a から二重管状に形成されている。そして、接続部
46は、内周管の一端が把持部42の図示しない第２の連結
部に嵌合固定され、外周管46a が図示しない第１の連結
部に嵌合固定されて接続されている。Further, a connecting portion 46 having elasticity such as a metal spiral flexible tube or a heat resistant synthetic resin flexible tube is connected to the grip portion 42. The connecting portion 46 is formed in a double-pipe shape from an elongated cylindrical inner peripheral tube (not shown) having elasticity and an elongated cylindrical outer peripheral tube 46a made of the same material. And the connection
One end of the inner peripheral pipe 46 is fitted and fixed to a second connecting portion (not shown) of the grip portion 42, and the outer peripheral pipe 46a is fitted and fixed to a first connecting portion (not shown) to be connected.
【００４２】また、この接続部46の先端側には、液面セ
ンサ48が設けられている。A liquid level sensor 48 is provided on the tip side of the connecting portion 46.
【００４３】そして、液面センサ48は、例えば真鍮やア
ルミニウム合金などの導電性材料にて細長円筒状に形成
された外部電極49を有している。この外部電極49の長手
方向の両端部には、直径が略２mmの略円形の流通孔49a
が複数穿設され、この外部電極49の外周面には、軸方向
に沿って略等間隔に目盛が記された液面検査目視用目盛
50が設けられている。さらに、外部電極49の内周面側に
は、軸方向の両端近傍に位置して絶縁性の合成樹脂やゴ
ムなどの材料からなる外周面に図示しない凹部を有する
略環状の固定部が設けられている。The liquid level sensor 48 has an external electrode 49 formed of a conductive material such as brass or aluminum alloy in the shape of an elongated cylinder. At both ends in the longitudinal direction of the external electrode 49, a substantially circular through hole 49a having a diameter of about 2 mm is formed.
The outer electrode 49 has a plurality of perforations, and the outer surface of the external electrode 49 has a scale at a substantially equal interval along the axial direction for visual inspection of the liquid surface.
50 are provided. Further, on the inner peripheral surface side of the external electrode 49, there is provided a substantially annular fixing portion having a concave portion (not shown) on the outer peripheral surface made of a material such as an insulative synthetic resin or rubber located near both ends in the axial direction. ing.
【００４４】また、51は内部電極で、この内部電極51
は、外部電極49と同材質にて外部電極49より径小の細長
円筒状に形成されている。そして、この内部電極51は、
外部電極49に設けられた図示しない固定部の内周に両端
が嵌合固定されて、外周面が外部電極49の内周面と絶縁
間隙19を介して外部電極49内に同軸上に位置決め固定さ
れている。Reference numeral 51 is an internal electrode.
Is made of the same material as the external electrode 49 and is formed in an elongated cylindrical shape having a smaller diameter than the external electrode 49. Then, the internal electrode 51 is
Both ends are fitted and fixed to the inner periphery of a fixing portion (not shown) provided on the external electrode 49, and the outer peripheral surface is coaxially positioned and fixed inside the external electrode 49 through the insulating gap 19 and the inner peripheral surface of the external electrode 49. Has been done.
【００４５】また、液面センサ48の先端には、先端側の
固定部の外面に位置して熱電対やサーミスタなどの温度
検出手段53が設けられている。そして、この温度検出手
段53の周囲には、合成樹脂や硬質ゴムなどにて半球状に
形成された保護キャップ54が、周縁が外部電極49の周縁
に混合固定されて温度検出手段53を覆って設けられてい
る。なお、保護キャップ54には、直径が例えば２mm程度
の円形で内部にオイル２が流入可能で気液交換可能な流
入孔54a が複数穿設されている。Further, a temperature detecting means 53 such as a thermocouple or a thermistor is provided at the tip of the liquid level sensor 48, which is located on the outer surface of the fixed portion on the tip side. Around the temperature detecting means 53, a protective cap 54 formed in a hemispherical shape with synthetic resin, hard rubber, or the like covers the temperature detecting means 53 by mixing and fixing the peripheral edge with the peripheral edge of the external electrode 49. It is provided. The protective cap 54 has a circular shape with a diameter of, for example, about 2 mm, and has a plurality of inflow holes 54a through which the oil 2 can flow and gas-liquid can be exchanged.
【００４６】そして、液面センサ48の外部電極49の接続
部46側の端部の内周面および内部電極51の接続部46側の
端部の外周面には、把持部７の配線孔および接続部46の
図示しない内周管および外周管の間を通って配線された
一対のシールド線22a にて構成されたリード線22がそれ
ぞれ半田付けなどにより接続されている。さらに、温度
検出手段53には、把持部７の配線孔および接続部46の内
周管および外周管46aの間を通ってリード線22とともに
配線された電線55が接続されている。On the inner peripheral surface of the end portion of the liquid level sensor 48 on the connection portion 46 side of the external electrode 49 and on the outer peripheral surface of the end portion of the internal electrode 51 on the connection portion 46 side, Lead wires 22 each composed of a pair of shielded wires 22a that are wired through an inner peripheral pipe and an outer peripheral pipe (not shown) of the connecting portion 46 are connected by soldering or the like. Further, the temperature detecting means 53 is connected to an electric wire 55 which is wired together with the lead wire 22 through the wiring hole of the grip portion 7 and the inner peripheral pipe and the outer peripheral pipe 46a of the connecting portion 46.
【００４７】また、リード線22および電線55の把持部７
の端部から導出する側の端部には、図示しないコネクタ
が設けられ、これらコネクタは、制御装置56に接続され
るようになっている。そして、液面検知装置本体41を制
御装置56に接続されるとともに、図１ないし図４に示す
実施の形態と同様に、搬送管27を介して液面検知装置本
体41および予備タンク26が接続された電動ポンプ25が制
御装置56に接続されて液面検出装置本体57が構成され
る。Further, the holding portion 7 for the lead wire 22 and the electric wire 55
Connectors (not shown) are provided at the ends on the side extending from the ends, and these connectors are connected to the control device 56. The liquid level detection device main body 41 is connected to the control device 56, and the liquid level detection device main body 41 and the auxiliary tank 26 are connected via the transport pipe 27 as in the embodiment shown in FIGS. 1 to 4. The electric pump 25 thus operated is connected to the control device 56 to form the liquid level detection device body 57.
【００４８】一方、制御装置56は、図１ないし図４に示
す実施の形態の制御装置24の制御回路34が電源手段、静
電容量検出手段、液面検知手段および温度補正手段とし
ての機能を有したものである。On the other hand, in the control device 56, the control circuit 34 of the control device 24 of the embodiment shown in FIGS. 1 to 4 functions as a power supply means, an electrostatic capacitance detection means, a liquid level detection means and a temperature correction means. I have.
【００４９】次に、上記図５ないし図７に示す実施の形
態の動作を説明する。Next, the operation of the embodiment shown in FIGS. 5 to 7 will be described.
【００５０】例えば図示しない自動車の出荷前の諸検査
におけるオイル２の量を検査する際、まず、図示しない
固定手段を操作して鍔部44を把持部42の軸方向に沿って
移動させ、検査する車種に対応させて把持部42の外周面
に設けた所定の位置目盛43に当接面45を位置合わせす
る。すなわち、当接面45から保護キャップ54の先端まで
の長さが所定の長さとなるように、固定手段を操作して
鍔部44を摺動させ、所定の位置に位置決め固定する。For example, when inspecting the amount of oil 2 in various inspections before the shipment of an automobile (not shown), first, the fixing means (not shown) is operated to move the collar portion 44 along the axial direction of the grip portion 42 and inspect it. The contact surface 45 is aligned with a predetermined position scale 43 provided on the outer peripheral surface of the grip portion 42 in accordance with the type of vehicle to be used. That is, the fixing means is operated to slide the collar portion 44 so that the length from the contact surface 45 to the tip of the protective cap 54 becomes a predetermined length, and the collar portion 44 is positioned and fixed at a predetermined position.
【００５１】そして、図１ないし図４に示す実施の形態
と同様に、商用交流電源39が供給された制御装置56に液
面検知装置本体41を接続し、制御装置56の図示しない電
源スイッチを閉成し、液面検知装置本体41を、当接面45
が導出管３の上端の点検口４の周縁に当接するまで、液
面センサ48を点検口４から導出管３を介してオイルパン
１内に挿入する。なお、この挿入の際、接続部46は弾性
を有するため、屈曲する導出管３の屈曲に対応して屈曲
する。そして、液面センサ48のオイルパン１内のオイル
２への浸漬により、把持部42の通気路から接続部46の内
周管および外周管46a の間を介して液面センサ48の外部
電極49と内部電極51との間の絶縁間隙19内の空気などが
排気されるとともに、外部電極49に開口する流通孔49a
を介してオイル２が絶縁間隙19に浸入する。さらに、液
面センサ48の先端に設けた保護キャップ54内に流入孔54
a を介してオイル２が流入する。As in the embodiment shown in FIGS. 1 to 4, the liquid level detection device main body 41 is connected to the control device 56 to which the commercial AC power supply 39 is supplied, and the power switch (not shown) of the control device 56 is connected. Close the liquid level detection device main body 41, contact surface 45
The liquid level sensor 48 is inserted into the oil pan 1 from the inspection port 4 through the extraction pipe 3 until the contact with the peripheral edge of the inspection port 4 at the upper end of the extraction pipe 3. At the time of this insertion, since the connecting portion 46 has elasticity, it bends corresponding to the bending of the bending lead-out tube 3. Then, by immersing the liquid level sensor 48 in the oil 2 in the oil pan 1, the external electrode 49 of the liquid level sensor 48 is passed from the air passage of the grip portion 42 through the inner peripheral pipe and the outer peripheral pipe 46a of the connecting portion 46. The air in the insulating gap 19 between the inner electrode 51 and the inner electrode 51 is exhausted, and at the same time, a through hole 49a that opens to the outer electrode 49 is formed.
The oil 2 penetrates into the insulating gap 19 via the. Further, an inflow hole 54 is provided in a protective cap 54 provided at the tip of the liquid level sensor 48.
Oil 2 flows in via a.
【００５２】そして、保護キャップ54内に配設された温
度検出手段53によりオイル２の温度が検出されて、この
検出された所定の電気信号が電線55を介して制御装置56
に伝送される。さらに、外部電極49および内部電極51間
の絶縁間隙19に浸入したオイル２により外部電極49およ
び内部電極51間の誘電率による静電容量の電位がリード
線22を介して制御装置56に伝送される。Then, the temperature of the oil 2 is detected by the temperature detecting means 53 provided in the protective cap 54, and the detected predetermined electric signal is transmitted via the electric wire 55 to the control device 56.
Is transmitted to Further, the oil 2 that has penetrated into the insulating gap 19 between the external electrode 49 and the internal electrode 51 transmits the potential of the electrostatic capacitance due to the dielectric constant between the external electrode 49 and the internal electrode 51 to the control device 56 via the lead wire 22. It
【００５３】この液面センサ48からの静電容量の電位
が、制御装置56の制御回路34にて温度検出手段53からの
電気信号により温度補正されて、温度検出手段53の電気
信号および温度補正された静電容量の電位は、図１ない
し図４に示す実施の形態と同様に、表示部36で表示され
るとともに、Ａ／Ｄコンバータ35によりデジタル信号に
変換されてインターフェース35を介して演算記憶装置38
に伝送し、演算記憶装置38で各種処理および記録を行
う。The electric potential of the electrostatic capacitance from the liquid level sensor 48 is temperature-corrected by the electric signal from the temperature detecting means 53 in the control circuit 34 of the control device 56, and the electric signal of the temperature detecting means 53 and the temperature correction are carried out. The potential of the electrostatic capacitance is displayed on the display unit 36, converted into a digital signal by the A / D converter 35, and calculated via the interface 35, as in the embodiment shown in FIGS. Storage device 38
Then, various processing and recording are performed in the arithmetic storage device 38.
【００５４】そして、温度補正された液面センサ48から
の静電容量の電位にて、所定の範囲内でないことを検知
し、オイル２の量が所定量より多いまたは少ないことを
認識した際、図１ないし図４に示す実施の形態と同様
に、電動ポンプ25を駆動させ、オイル２の給排を行う。Then, when it is detected that the amount of the oil 2 is larger or smaller than the predetermined amount by detecting that the electric potential of the capacitance from the temperature-corrected liquid level sensor 48 is not within the predetermined range, Similar to the embodiment shown in FIGS. 1 to 4, the electric pump 25 is driven to supply and discharge the oil 2.
【００５５】上記図５ないし図７に示す実施の形態によ
れば、図１ないし図４に示す実施の形態に加え、温度変
化によりオイル２の誘電率は若干変化し、静電容量の電
位が変化するので、液面センサ48の先端に温度検出手段
53を設け、この温度検出手段53にて液面センサ48にて検
知される静電容量の電位を温度補正するため、より高精
度に液位を検出できる。According to the embodiment shown in FIGS. 5 to 7, in addition to the embodiment shown in FIGS. 1 to 4, the dielectric constant of the oil 2 is slightly changed due to the temperature change, and the potential of the electrostatic capacitance is changed. As it changes, the temperature sensor is attached to the tip of the liquid level sensor 48.
Since the temperature detecting means 53 is provided and the potential of the capacitance detected by the liquid level sensor 48 is temperature-corrected by the temperature detecting means 53, the liquid level can be detected with higher accuracy.
【００５６】一方、把持部42と液面センサ48とを弾性を
有した二重管状の接続管46にて接続したため、液面セン
サ48の外部電極49および内部電極51を可撓性を持たせて
形成する必要がなく、安価に形成できる。さらに、リー
ド線22や電線55を内部に収容でき接続部46の外部に露出
することにより外観が損なわれることがなく、接続部46
の導出管３への挿入の際の摩擦によるリード線22および
電線55の損傷を防止できる。さらに、導出管３の屈曲に
対応して接続部46が屈曲するので導出管３の屈曲状態を
問わずに測定できる。また、液面センサ48を挿入するの
みで液面センサ48の静電容量の電位により短時間で高精
度な液面位置の測定が容易にできるとともに、液位によ
り液面センサ48を引き抜くことなく液位を検出しつつ適
宜オイル２の給排を行うため、オイル２の給排作業性が
容易にできる。On the other hand, since the grip portion 42 and the liquid level sensor 48 are connected by the elastic double-tube connecting pipe 46, the external electrode 49 and the internal electrode 51 of the liquid level sensor 48 are made flexible. It does not need to be formed in advance and can be formed at low cost. Further, the lead wire 22 and the electric wire 55 can be housed inside and the external appearance of the connecting portion 46 is not deteriorated by being exposed to the outside of the connecting portion 46.
It is possible to prevent the lead wire 22 and the electric wire 55 from being damaged due to friction when they are inserted into the outlet pipe 3. Furthermore, since the connecting portion 46 bends in accordance with the bending of the lead-out tube 3, the measurement can be performed regardless of the bent state of the lead-out tube 3. Further, by simply inserting the liquid level sensor 48, it is possible to easily measure the liquid level position with high accuracy in a short time by the electric potential of the capacitance of the liquid level sensor 48, and without pulling out the liquid level sensor 48 depending on the liquid level. Since the oil 2 is appropriately supplied and discharged while detecting the liquid level, the workability of supplying and discharging the oil 2 can be facilitated.
【００５７】さらに、導出管３の点検口４の周縁に当接
する当接面45を有した鍔部44を、把持部42の軸方向に沿
って摺動可能に設けたため、鍔部44を摺動移動させるの
みで、オイルパン１や導出管３の形状が異なる場合でも
高精度に液面位置を容易に測定でき、汎用性を向上でき
る。Further, since the collar portion 44 having the contact surface 45 which contacts the peripheral edge of the inspection port 4 of the lead-out pipe 3 is provided slidably along the axial direction of the grip portion 42, the collar portion 44 is slid. Even if the shapes of the oil pan 1 and the outlet pipe 3 are different, the liquid surface position can be easily measured with high accuracy by merely moving the liquid pan, and the versatility can be improved.
【００５８】なお、上記実施の各形態において、フラン
ジ部９あるいは鍔部44の当接面10，45にスイッチを設
け、液面の検出の際、当接面10，45が導出管３の上端縁
に当接した際にスイッチが閉成し、液面の検出を行うよ
うにしてもよい。このスイッチを設ける構成により、基
準面となる当接面10，45が確実に導出管３の上端の点検
口４の周縁に当接した状態で液位を検出できるので、液
面の位置を高精度に確実に測定できる。In each of the above embodiments, a switch is provided on the contact surfaces 10 and 45 of the flange portion 9 or the collar portion 44, and when detecting the liquid surface, the contact surfaces 10 and 45 are the upper ends of the lead-out pipes 3. The switch may be closed upon contact with the edge to detect the liquid level. With the configuration in which this switch is provided, the liquid level can be detected with the contact surfaces 10 and 45 serving as the reference surfaces reliably contacting the peripheral edge of the inspection port 4 at the upper end of the outlet pipe 3, so that the position of the liquid surface can be increased. Accurately and reliably measure.
【００５９】また、把持部７，42の通気路に圧縮空気が
導入されるホースを接続し、把持部７，42に設けた図示
しない操作手段により把持部７，42内に配設した弁体を
開いて、液面センサ12，48の外部電極14，49と内部電極
15，51との間の絶縁間隙19に圧縮空気を吹き付け、絶縁
間隙19内に残るオイル２などの導電性の液体を吹き出
し、次の液面の検出に迅速に移れるようにしてもよい。Further, a hose into which compressed air is introduced is connected to the ventilation passages of the grips 7, 42, and a valve element disposed in the grips 7, 42 by an operating means (not shown) provided in the grips 7, 42. Open the external electrodes 14, 49 and internal electrodes of the liquid level sensors 12, 48
Alternatively, compressed air may be blown to the insulating gap 19 between 15 and 51, and a conductive liquid such as the oil 2 remaining in the insulating gap 19 may be blown out so that the next liquid level can be quickly detected.
【００６０】さらに、利用者が常に運転席から液面の位
置を確認できるように、運転席のパネル面に表示部36が
位置するように制御装置24，56を自動車に配設し、液面
検知装置本体６，41を導出管３に装着した状態で出荷
し、保守点検などの際のオイル２の状態を確認する場合
には、液面検知装置本体６，41を導出管３から引き抜
き、液面センサ12，48の外部電極14，49の外周面に付着
するオイル２の色などを観察できるようにしてもよい。Further, in order that the user can always confirm the position of the liquid level from the driver's seat, the control devices 24 and 56 are installed in the vehicle so that the display unit 36 is located on the panel surface of the driver's seat, and the liquid level is set. When shipping with the detection device bodies 6 and 41 attached to the outlet pipe 3 and checking the state of the oil 2 at the time of maintenance and inspection, pull out the liquid surface detection device bodies 6 and 41 from the outlet pipe 3, The color of the oil 2 adhering to the outer peripheral surfaces of the external electrodes 14, 49 of the liquid level sensors 12, 48 may be observed.
【００６１】なお、このように自動車に液面検知装置本
体６，41を装着する場合には、自動車の走行の際の振動
などにより液面が上下動することにより液面位置の表示
が目まぐるしく変動しないように、流通孔21，49a の孔
径を小さくし、オイル２の流通抵抗を大きくして絶縁間
隙19内のオイル２の液面を安定させることが好ましい。When the liquid level detection device bodies 6 and 41 are mounted on the vehicle as described above, the liquid level position fluctuates rapidly due to the vertical movement of the liquid level due to vibration or the like when the vehicle is running. To prevent this, it is preferable to reduce the diameter of the flow holes 21 and 49a and increase the flow resistance of the oil 2 to stabilize the liquid level of the oil 2 in the insulating gap 19.
【００６２】[0062]
【発明の効果】請求項１記載の液面検知装置によれば、
把持部に接続した液面センサを液体内に把持部の位置決
め手段により所定位置に挿入し、筒状の外部電極内の軸
方向に沿って設けた筒状の内部電極と外部電極との間の
絶縁間隙に流入する液体の位置によって変化する静電容
量の電位を測定して検知した液位により、通気路を介し
て空気調整しつつ適宜把持部の液流路を介して液体を給
排するため、液面センサを液体に挿入するのみで短時間
で高精度に液面位置を容易に検知できるとともに、液面
センサを液体中に挿入したまま液体が所定量となるまで
給排でき、給排作業を向上できる。According to the liquid level detection device of the first aspect,
The liquid level sensor connected to the grip portion is inserted into the liquid at a predetermined position by the positioning means of the grip portion, and between the cylindrical internal electrode and the external electrode provided along the axial direction in the cylindrical external electrode. The liquid level detected by measuring the electric potential of the electrostatic capacitance that changes depending on the position of the liquid flowing into the insulating gap is used to adjust the air through the ventilation passage and appropriately supply and discharge the liquid through the liquid flow path of the grip portion. Therefore, it is possible to easily and accurately detect the liquid surface position in a short time simply by inserting the liquid surface sensor into the liquid, and it is possible to supply and discharge until the liquid reaches a predetermined amount while the liquid surface sensor is inserted in the liquid. The discharge work can be improved.
【００６３】請求項２記載の液面検知装置によれば、請
求項１記載の液面検知装置に加え、把持部に液面センサ
を弾性を有する管状の接続部を介して接続したため、例
えば液面の検知箇所が屈曲する場合でも、接続部を液面
の検知箇所の屈曲に対応して屈曲させつつ、液面センサ
を位置決め手段にて所定位置となるように液体内に挿入
するのみで、容易に短時間で高精度に液面位置を検知で
きる。また、接続部が管状であるため、外部電極および
内部電極間の静電容量の電位を伝達するリード線を接続
部内に配設でき、リード線が露出することなく液面の検
知箇所の摩擦・屈曲などによるリード線の損傷を防止で
きる。According to the liquid level detecting device of the second aspect, in addition to the liquid level detecting device of the first aspect, since the liquid level sensor is connected to the gripping portion through the tubular connecting portion having elasticity, for example, Even when the detection point on the surface bends, simply by inserting the liquid level sensor into the liquid at a predetermined position by the positioning means while bending the connection part in response to the bending of the detection point on the liquid level, The liquid surface position can be easily detected with high accuracy in a short time. In addition, since the connection part is tubular, a lead wire that transmits the potential of the electrostatic capacitance between the external electrode and the internal electrode can be arranged in the connection part, and the lead wire is not exposed and friction / It is possible to prevent lead wires from being damaged by bending.
【００６４】請求項３記載の液面検知装置によれば、請
求項１または２記載の液面検知装置に加え、位置決め手
段を長手状の把持部の長手方向に沿って摺動可能に設け
たため、位置決め手段を摺動移動させるのみで、液面の
検知箇所を問わず液面を容易で高精度に検知でき汎用性
を向上できる。According to the liquid level detection device of the third aspect, in addition to the liquid level detection device of the first or second aspect, the positioning means is provided slidably along the longitudinal direction of the elongated grip portion. By simply sliding the positioning means, the liquid surface can be detected easily and with high accuracy regardless of the detection position of the liquid surface, and the versatility can be improved.
【００６５】請求項４記載の液面検出装置によれば、請
求項１ないし３いずれか記載の液面検知装置の液面セン
サを液体内に挿入し、電源手段により液面センサの外部
電極および内部電極間に印加された電圧に基づき外部電
極および内部電極間の静電容量を静電容量検出手段にて
検出し、この静電容量検出手段で検出した静電容量に基
づき液面検知手段により液位を検知するとともに、この
液面検知手段で検知した液位に基づいて適宜液体給排手
段にて把持部の液流路を介して液体を給排するため、液
面センサを位置決め手段にて所定位置となるように液体
内に挿入するのみで、短時間で高精度に液面位置を容易
に検知できるとともに、液面センサを液体中に挿入した
ままで液体の給排により液体を所定量に維持できる。According to the liquid level detecting device of the fourth aspect, the liquid level sensor of the liquid level detecting device according to any one of the first to third aspects is inserted into the liquid, and the external electrode of the liquid level sensor and the external electrode of the liquid level sensor are supplied by the power supply means. Based on the voltage applied between the internal electrodes, the electrostatic capacitance between the external electrode and the internal electrode is detected by the electrostatic capacitance detection means, and by the liquid level detection means based on the electrostatic capacitance detected by this electrostatic capacitance detection means. In addition to detecting the liquid level, the liquid level sensor is used as the positioning means in order to appropriately supply and discharge the liquid through the liquid flow path of the gripping portion by the liquid supply / discharge means based on the liquid level detected by the liquid level detection means. It is possible to easily detect the liquid surface position with high accuracy in a short time by simply inserting it into the liquid so that it will be at a predetermined position. It can be maintained at a fixed amount.
【００６６】請求項５記載の液面検出装置によれば、請
求項４記載の液面検出装置に加え、液面センサ近傍に取
り付けた温度検出手段にて液体の温度を検出し、この温
度検出手段で検出した液体の温度に基づき温度補正手段
により液面検知手段で検知した液位を補正するため、温
度により液体の誘電率が変化するなどしても短時間で高
精度に液面位置を容易に検知できる。According to the liquid level detecting device of the fifth aspect, in addition to the liquid level detecting device of the fourth aspect, the temperature of the liquid is detected by the temperature detecting means attached in the vicinity of the liquid level sensor, and the temperature is detected. Since the liquid level detected by the liquid level detection unit is corrected by the temperature correction unit based on the temperature of the liquid detected by the unit, the liquid level position can be accurately adjusted in a short time even if the dielectric constant of the liquid changes with temperature. It can be easily detected.
【図１】本発明の液面検出装置の実施の一形態を示す液
面検知装置本体の一部を欠いた断面図である。FIG. 1 is a cross-sectional view showing a liquid level detection device according to an embodiment of the present invention with a part of a liquid level detection device main body cut away.
【図２】同上液面検出装置の使用状況を示す説明図であ
る。FIG. 2 is an explanatory diagram showing a usage state of the liquid level detection device of the above.
【図３】同上液面センサを示す先端の平面図である。FIG. 3 is a plan view of a tip showing the same liquid level sensor.
【図４】同上制御装置を示すブロック図である。FIG. 4 is a block diagram showing the same control device.
【図５】本発明の実施の他の形態の液面検知装置本体の
使用状況を示す説明図である。FIG. 5 is an explanatory diagram showing a usage state of a liquid surface detection device body according to another embodiment of the present invention.
【図６】同上液面センサを示す平面図である。FIG. 6 is a plan view showing the same liquid level sensor.
【図７】同上液面センサの先端を示す平面図である。FIG. 7 is a plan view showing a tip of the above liquid level sensor.
【図８】従来例の液面検出装置の実施の一形態を示す一
部を切り欠いた平面図である。FIG. 8 is a partially cutaway plan view showing an embodiment of a conventional liquid level detection device.
【図９】同上液面検知装置本体の使用状況を示す説明図
である。FIG. 9 is an explanatory diagram showing a usage state of the liquid level detection device main body.
１ タンクとしてのオイルパン ２ 液体であるオイル ４ 開口部としての点検口 ６，41 液面検知装置本体 ７，42 把持部 7a 液流路 7b 通気路 ９ 位置決め手段としてのフランジ部 12，48 液面センサ 14，49 外部電極 15，51 内部電極 19 絶縁間隙 28 液体給排手段 29，57 液面検出装置本体 44 位置決め手段としての鍔部 46 接続部 53 温度検出手段 1 Oil pan as tank 2 Oil as liquid 4 Inspection port as opening 6,41 Liquid level detector main body 7,42 Grip 7a Liquid flow path 7b Vent path 9 Flange part as positioning means 12,48 Liquid level Sensor 14,49 External electrode 15,51 Internal electrode 19 Insulation gap 28 Liquid supply / drainage means 29,57 Liquid level detection device main body 44 Collar portion as positioning means 46 Connection portion 53 Temperature detection means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大村 正人 静岡県浜松市高塚町300番地 スズキ株式 会社内 (72)発明者 伊藤 衛 静岡県浜松市高塚町300番地 スズキ株式 会社内 (72)発明者 栗田 良祐 静岡県浜松市高塚町300番地 スズキ株式 会社内 (72)発明者 坪井 正隆 静岡県浜松市神田町1195番地 浜松貿易株 式会社内 (72)発明者 山本 光雄 静岡県浜松市古川町500番地 株式会社ソ ミック石川浜松工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masato Omura, 300 Takatsuka-cho, Hamamatsu-shi, Shizuoka, Suzuki Stock Company (72) Inventor, Mamoru Ito 300, Takatsuka-cho, Hamamatsu-shi, Shizuoka, Suzuki Company (72) Inventor Ryosuke Kurita 300 Takazuka-cho, Hamamatsu-shi, Shizuoka Suzuki Stock Company (72) Inventor Masataka Tsuboi 1195 Kanda-cho, Hamamatsu-shi, Shizuoka Prefecture Hamamatsu Trading Co., Ltd. (72) In-house Mitsuo Yamamoto 500 Furukawa-cho, Hamamatsu City, Shizuoka Prefecture Company Somic Ishikawa Hamamatsu Factory
Claims (5)
に対して絶縁間隙を介してこの外部電極内に略同軸上に
設けられた筒状の内部電極を備え誘電性を有する液体内
に挿入される液面センサと、 この液面センサに接続され前記内部電極の内周に連通し
前記液体が流通可能な液流路および前記絶縁間隙に連通
し空気が流通可能な通気路を備えた把持部と、 この把持部に設けられ前記液体を貯溜するタンクに形成
された開口部の縁に当接し液面センサの位置を所定位置
に設定する位置決め手段とを具備したことを特徴とする
液面検知装置。1. A liquid having a dielectric property, comprising a cylindrical external electrode and a cylindrical internal electrode provided substantially coaxially with the external electrode via an insulating gap with respect to the external electrode. A liquid level sensor to be inserted, a liquid flow path connected to the liquid level sensor and communicating with the inner periphery of the internal electrode for allowing the liquid to flow, and a ventilation path for communicating with the insulating gap and allowing air to flow. A liquid comprising: a gripping part, and a positioning means for abutting against an edge of an opening formed in a tank for storing the liquid, which is provided in the gripping part, and sets the position of the liquid level sensor to a predetermined position. Face detection device.
状の接続部を介して接続したことを特徴とする請求項１
記載の液面検知装置。2. The gripping part connects the liquid level sensor via a tubular connecting part having elasticity.
Liquid level detection device described.
把持部の長手方向に沿って摺動可能であることを特徴と
する請求項１または２記載の液面検知装置。3. The liquid level detection device according to claim 1, wherein the grip portion is elongated and the positioning means is slidable along the longitudinal direction of the grip portion.
知装置と、 電源手段により液面センサの外部電極および内部電極間
に印加された電圧に基づき前記外部電極および前記内部
電極間の静電容量を検出する静電容量検出手段と、 この静電容量検出手段で検出された静電容量に基づき液
位を検知する液面検知手段と、 この液面検知手段で検知した液位に対応して把持部の液
流路を介して液体を給液または排液する液体給排手段と
を具備したことを特徴とする液面検出装置。4. The liquid level detection device according to claim 1, and a static electricity between the external electrode and the internal electrode based on a voltage applied between the external electrode and the internal electrode of the liquid level sensor by a power supply means. Capacitance detection means for detecting the capacitance, liquid level detection means for detecting the liquid level based on the capacitance detected by the capacitance detection means, and liquid level detected by the liquid level detection means And a liquid supply / drainage means for supplying or discharging the liquid through the liquid flow path of the grip portion.
度を検出する温度検出手段と、 この温度検出手段で検出された液面の温度に基づき液面
検知手段で検知された液位を補正する温度補正手段とを
具備したことを特徴とする請求項４記載の液面検出装
置。5. A temperature detecting means mounted near the liquid level sensor for detecting the temperature of the liquid, and the liquid level detected by the liquid level detecting means is corrected based on the temperature of the liquid level detected by the temperature detecting means. The liquid level detection device according to claim 4, further comprising temperature correction means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16907495A JP3155910B2 (en) | 1995-07-04 | 1995-07-04 | Liquid level detector and liquid level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16907495A JP3155910B2 (en) | 1995-07-04 | 1995-07-04 | Liquid level detector and liquid level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0921677A true JPH0921677A (en) | 1997-01-21 |
| JP3155910B2 JP3155910B2 (en) | 2001-04-16 |
Family
ID=15879850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16907495A Expired - Fee Related JP3155910B2 (en) | 1995-07-04 | 1995-07-04 | Liquid level detector and liquid level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3155910B2 (en) |
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