JPS60119420A - Liquid level detector - Google Patents
Liquid level detectorInfo
- Publication number
- JPS60119420A JPS60119420A JP22793083A JP22793083A JPS60119420A JP S60119420 A JPS60119420 A JP S60119420A JP 22793083 A JP22793083 A JP 22793083A JP 22793083 A JP22793083 A JP 22793083A JP S60119420 A JPS60119420 A JP S60119420A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- liquid
- light
- emitting element
- temperature
- 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.)
- Pending
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims description 12
- 206010014357 Electric shock Diseases 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/292—Light, e.g. infrared or ultraviolet
- G01F23/2921—Light, e.g. infrared or ultraviolet for discrete levels
Abstract
Description
【発明の詳細な説明】
（１）
〔技術分野〕
本発明は浴槽等各種の液槽中の液位と液温を検出する液
体検知器に関するものである。DETAILED DESCRIPTION OF THE INVENTION (1) [Technical Field] The present invention relates to a liquid detector that detects the liquid level and temperature in various liquid tanks such as bathtubs.
従来、液位や液温の検知器は、液位検知器にあっては、
第１図、第２図に示すように正、負の２つの電極Ｅ１
＋ Ｅ２を設け、この電極Ｅ、 、 Ｅ２間に液位が達
したときの両極間の電気抵抗の低下を検出するものがお
り、また液温の検知器にあっては第３図に示すように感
熱素子としてバイメタルＢを用い、その受熱部Ｊを外ｓ
′ＩＧに接触させて、バイメタルＢの反りＫより固定接
点間を閉路して、報知するものがあったが、いずれの場
合も、電極に相当する部材が、液中に露出しているので
、落雷等により感電する危険性があった。Conventionally, liquid level and liquid temperature detectors are
As shown in Figures 1 and 2, two positive and negative electrodes E1
+ E2 and detects the drop in electrical resistance between the two electrodes when the liquid level reaches between these electrodes E, , and E2. A bimetal B is used as a heat-sensitive element, and its heat-receiving part J is placed outside.
'There was one that made the alarm by contacting the IG and closing the fixed contact due to the warpage K of the bimetal B, but in both cases, the member corresponding to the electrode is exposed in the liquid, so There was a risk of electric shock due to lightning strikes, etc.
本発明は前記の問題点に着目してなされたものであり、
感電のおそれのない安全な液位、液ン晶等を検出しうる
液体検知器を得ることを目的とする。The present invention has been made focusing on the above-mentioned problems,
The purpose of this invention is to obtain a liquid detector that can detect safe liquid levels, liquid crystals, etc. without the risk of electric shock.
本発明は発光素子の液中での散乱光を受光素子で検出し
て報知するものであり、発光素子は温度検出素子により
発光強度が変化するものとし、受光素子は液位を検出す
るものと液温を検出するものの二つの受光素子を具備し
た構成としたものである。The present invention detects scattered light of a light emitting element in a liquid using a light receiving element and provides notification.The light emitting element has a temperature detecting element that changes the emission intensity, and the light receiving element detects the liquid level. It has a configuration that includes two light-receiving elements for detecting liquid temperature.
以下本発明の実施例の第４図乃至第８図に従い説明する
。液体検知器１は本体１の下方中央部に切込部２を有し
、底部に温度検出素子３を有している。一方向側壁２ａ
には、温度検出素子３の出力により光度が変化する発光
素子４が設けである。Embodiments of the present invention will be described below with reference to FIGS. 4 to 8. The liquid detector 1 has a notch 2 in the lower center of the main body 1, and a temperature detection element 3 at the bottom. One-way side wall 2a
A light emitting element 4 whose luminous intensity changes depending on the output of the temperature detection element 3 is provided.
内側壁２ａに対向する内側壁２ｂには発光素子４と対向
する位置に受光素子５が設けてあり、発光素子４の直接
光が入光するようにしである。この受光素子５はフォト
トランジスタ５ａ等で構成し、ベース抵抗６を介してト
ランジスタ７が信号線Ｌｓ、共通線Ｃ３間に接続しであ
る。３ａは感温サーミヌタである。発光素子４は温度検
出素子３と直列に接続しである。８は調整抵抗である。A light receiving element 5 is provided on the inner wall 2b opposite to the inner wall 2a at a position facing the light emitting element 4, so that direct light from the light emitting element 4 enters. The light receiving element 5 is composed of a phototransistor 5a and the like, and a transistor 7 is connected through a base resistor 6 between the signal line Ls and the common line C3. 3a is a temperature sensitive therminuta. The light emitting element 4 is connected in series with the temperature detecting element 3. 8 is an adjustment resistor.
本実施例では液温の上昇にともない感温サーミ（３）
スタ３ａの抵抗が低下すると、発光素子４の発光強度が
増し、フォトトランジスタ５ａが動作し、トランジスタ
７がスイッチングして所定温度に達したことを報知する
。In this embodiment, when the resistance of the thermosensor 3a decreases as the liquid temperature rises, the light emission intensity of the light emitting element 4 increases, the phototransistor 5a operates, and the transistor 7 switches to reach a predetermined temperature. Report what has happened.
第５図の実施例は発光素子４と受光素子５との配置を光
軸をずらせて配置したものであり、発光素子４の光が液
中で散乱し、その散乱光の光度変化を受光素子で検出す
るようにしたものである。In the embodiment shown in FIG. 5, the light emitting element 4 and the light receiving element 5 are arranged with their optical axes shifted, and the light from the light emitting element 4 is scattered in the liquid, and the light intensity change of the scattered light is reflected by the light receiving element. It is designed to be detected by
第６図は、第４図、第５図に共通の回路図である。FIG. 6 is a circuit diagram common to FIGS. 4 and 5.
第７図及び第８図は液位と液温の両方を検出するように
した例であり、温度検出素子３が底面部に設置してあり
、発光素子４の設置面の対向面に液位検出用の受光素子
５ｂ、液温検出用の受光素子５ａが設けである。液位は
発光素子４の光が液体による散乱光が受光素子５ａに入
光することで検出し、液温は、感温サーミヌタ３ａが温
度上昇に伴ない抵抗値を低下させることにより発光強度
が増し、受光素子５ｂで検出するようにしである。7 and 8 are examples in which both the liquid level and the liquid temperature are detected, in which the temperature detection element 3 is installed on the bottom, and the liquid level is on the opposite surface to the installation surface of the light emitting element 4. A light receiving element 5b for detection and a light receiving element 5a for liquid temperature detection are provided. The liquid level is detected by the light from the light emitting element 4 and the light scattered by the liquid entering the light receiving element 5a, and the liquid temperature is detected by the temperature sensitive therminutor 3a decreasing the resistance value as the temperature rises, so that the emission intensity increases. In addition, the light is detected by the light receiving element 5b.
以上説明したように本発明によれば発光素子の（４）
液中での散乱光を受光素子で検出して報知するものとし
、発光素子は温度検出素子により発光強度が変化するも
のとし、受光素子は液位を検出するものと液温を検出す
るものの二つの受光素子を具備した構成としたので、従
来の露出電極式のような感電の危険性が全くない本質安
全の液体検知器が達成された。また液体中の散乱光また
は直接光を受光する構成なので液体の濁りも検出するセ
ンサの性能も具備しているので、この面での利用も可能
である。As explained above, according to the present invention, (4) scattered light in the liquid of the light-emitting element is detected by the light-receiving element and the light-emitting element is configured to change the emission intensity by the temperature-detecting element. The element is configured with two light-receiving elements, one for detecting liquid level and one for detecting liquid temperature, resulting in an intrinsically safe liquid detector that has no risk of electric shock as with conventional exposed electrode types. It was done. Furthermore, since it is configured to receive scattered light or direct light in the liquid, it also has the performance of a sensor that can detect turbidity of the liquid, so it can also be used in this aspect.
第１図乃至第３図は従来例を示し、第１図は液位検知器
の斜視図、第２図は回路図、第３図は液温検知器の一部
断面斜視図である。
第４図乃至第８図は本発明の実施例を示し、第第７図は
第３発明の液体検知器の斜視図、第８図は回路図である
。
１・・・液体検知器、３・・・温度検出素子、４・・・
発光（５）
素子、５ 、５ａ 、 ５ｂ・・・受光素子。
特許出願人
松下冨工株式会社
代理人弁理士 竹 元 敏 丸
（ほか２名）
６ｓ
Ｑ 」1 to 3 show a conventional example, in which FIG. 1 is a perspective view of a liquid level sensor, FIG. 2 is a circuit diagram, and FIG. 3 is a partially sectional perspective view of a liquid temperature sensor. 4 to 8 show embodiments of the present invention, FIG. 7 is a perspective view of a liquid detector of the third invention, and FIG. 8 is a circuit diagram. 1...Liquid detector, 3...Temperature detection element, 4...
Light emitting (5) element, 5, 5a, 5b...light receiving element. Patent applicant Matsushita Tomiko Co., Ltd. Representative patent attorney Toshimaru Takemoto (and 2 others) 6s Q
Claims (1)
が変化する発光素子と、発光素子と対向して配置し前記
発光素子の強度変化を検出して出力する受光素子を設け
たことを特徴とする液体検知器。 ２）温度検出素子と、温度検出素子により発光強度が変
化する発光素子と、発光素子の光が直接入光しないよう
配置した受光素子を設け、発光素子の液体中での散乱光
の変化を受光素子で検出して出力することを特徴とする
液体検知器。 ３）？ｍ度検出素子と、温度検出素子によシ発光強度が
変化する発光素子と、発光素子の液体による散乱光を受
光して液位を検出する受光素子と、液温の変化にともな
う発光素子の散乱光の光度変化を検出する受光素子を設
けたことを特徴とする液体検知器。[Scope of Claims] 1) /M degree detection element, a light emitting element whose emission intensity changes with a temperature detection element, and a light receiving element arranged opposite to the light emitting element and detecting and outputting changes in the intensity of the light emitting element. A liquid detector characterized by being provided with. 2) A temperature detection element, a light emitting element whose emission intensity changes depending on the temperature detection element, and a light receiving element arranged so that the light from the light emitting element does not enter directly are provided, and changes in scattered light from the light emitting element in the liquid are detected. A liquid detector characterized by detecting and outputting with an element. 3)? m degree detection element, a light emitting element whose emission intensity changes depending on the temperature detection element, a light receiving element which detects the liquid level by receiving light scattered by the liquid of the light emitting element, and a light emitting element whose emission intensity changes as the liquid temperature changes. A liquid detector characterized by being provided with a light receiving element that detects changes in luminous intensity of scattered light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22793083A JPS60119420A (en) | 1983-11-30 | 1983-11-30 | Liquid level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22793083A JPS60119420A (en) | 1983-11-30 | 1983-11-30 | Liquid level detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60119420A true JPS60119420A (en) | 1985-06-26 |
Family
ID=16868515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22793083A Pending JPS60119420A (en) | 1983-11-30 | 1983-11-30 | Liquid level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60119420A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677738U (en) * | 1993-04-20 | 1994-11-01 | 日出海 近藤 | Open medicine wrapping paper |
| WO2018073902A1 (en) * | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Liquid level sensor and refrigeration cycle system |
-
1983
- 1983-11-30 JP JP22793083A patent/JPS60119420A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0677738U (en) * | 1993-04-20 | 1994-11-01 | 日出海 近藤 | Open medicine wrapping paper |
| WO2018073902A1 (en) * | 2016-10-19 | 2018-04-26 | 三菱電機株式会社 | Liquid level sensor and refrigeration cycle system |
| JPWO2018073902A1 (en) * | 2016-10-19 | 2019-06-24 | 三菱電機株式会社 | Liquid level detection device and refrigeration cycle device |
| US11493248B2 (en) | 2016-10-19 | 2022-11-08 | Mitsubishi Electric Corporation | Liquid level detection device and refrigeration cycle apparatus |
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