JPS6247521A - Liquid level detecting instrument - Google Patents

Liquid level detecting instrument

Info

Publication number
JPS6247521A
JPS6247521A JP18810785A JP18810785A JPS6247521A JP S6247521 A JPS6247521 A JP S6247521A JP 18810785 A JP18810785 A JP 18810785A JP 18810785 A JP18810785 A JP 18810785A JP S6247521 A JPS6247521 A JP S6247521A
Authority
JP
Japan
Prior art keywords
liquid level
diode
level detection
voltage
light
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
Application number
JP18810785A
Other languages
Japanese (ja)
Inventor
Takashi Yoshida
隆 吉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP18810785A priority Critical patent/JPS6247521A/en
Publication of JPS6247521A publication Critical patent/JPS6247521A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To detect a liquid level with high reliability and high accuracy by adding an optical combining system to a cylindrical liquid level detecting tube having lens action to connect the upper and lower opening space. CONSTITUTION:A cylindrical liquid level detecting tube 10 having the lens action connecting the upper and lower openings 1a, 1b of a container 1, an infrared light emitting diode 11 opposingly installed by pinching the detecting tube 10 and an infrared ray photo-detecting diode 12, etc. are provided. These diodes 11 and 12 are connected in parallel with each other by connecting a current control resistances 13 and 14 in series and one end thereof is connected to the electric power source terminal and the other end to earth. Irradiating the infrared ray emitted from the diode 11 on the diode 12 via the curving face of the detecting tube 10, the current varying with the liquid level is passed to the diode 12, and detecting this current varying state by the voltage comparator 19 of one part of the components of the optical combining system, a detection buzzer 7 and solidstate relay 9 are driven.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、容器中の水又は灯油の液面レベルを検知1゛
る液面レベル検知装置に関するちのである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid level detection device for detecting the liquid level of water or kerosene in a container.

「従来の技術] 第8図は、例えば[リードスイッヂの知識」(S55.
1.■8日本ハムリン発行)に示された従来の液面レベ
ル検出装置の構成図、第9図はその回路図であり、図に
おいて、(1)は容器、(2)は容器(1)に入れた水
又は灯油などの液体、(3)はマグネット(4)を有す
るフロート(浮子)、(5)はフロート(4)の案内を
兼ねて容器(1)内に設けた密閉筒体、(6)は密閉筒
体(5)内に収納したリードスイッヂである。
"Prior art" FIG. 8 shows, for example, "Knowledge of reed switches" (S55.
1. ■ Figure 9 is a circuit diagram of a conventional liquid level detection device shown in 8 Nippon Hamlin (published by Nippon Hamlin). In the figure, (1) is a container, and (2) is a liquid such as water or kerosene; (3) is a float having a magnet (4); (5) is a sealed cylindrical body provided inside the container (1) to also serve as a guide for the float (4); (6) ) is a reed switch housed in a sealed cylinder (5).

上記リードスイッヂ(6)は検知ブザー(7)を介して
電源装置(8)に接続され、上記検知ブザー(7)には
並列にソリッドスデートリレ−(9)が接続されている
The reed switch (6) is connected to a power supply device (8) via a detection buzzer (7), and a solid state relay (9) is connected in parallel to the detection buzzer (7).

次に動作について説明する。いま、例えば容2:〈1)
の中に液体(2)が十分溝たされている場合、フロート
(3)は第8図2点鎖線示位首に位置して、リードスイ
ッチ(6)と70−h(3)にあるマグネット(4)ど
の距離が第10図点鎖線示のように遠り、従って、リー
ドスイッチ(6)はOFF状態にある。このため、電源
装置(8)から検知ブザー(7)やソリッドステートリ
レー(9)へ電源が供給されない。
Next, the operation will be explained. Now, for example, Yo2:〈1)
When the liquid (2) is sufficiently filled in the groove, the float (3) is located at the position indicated by the two-dot chain line in Fig. 8, and the magnet located at the reed switch (6) and 70-h (3) (4) Which distance is far away as shown by the dashed line in FIG. 10, so the reed switch (6) is in the OFF state. Therefore, power is not supplied from the power supply device (8) to the detection buzzer (7) or the solid state relay (9).

次に、容器(′1)の中の液体(2)が徐々にへり、そ
の液面がある基型レベルに達すると、リードスイッチ(
6)とフロート(3)にあるマグネッ1−(4)との距
離が近くなり、リードスイッチ〈6)はマグネット(4
)の磁気吸引力を受(プてON状態になる。従って、電
源装置(8)から検知ブザー(7)やソリッドステート
リレー(9)へ電源が供給され、これら検知111−(
7)、ソリッドステートリレー(9)の駆動で、容器(
1)の中の液体(2)が基準レベルまで減少したことを
検出表示する。
Next, the liquid (2) in the container ('1) gradually decreases and when the liquid level reaches a certain base level, the reed switch (
6) and the magnets 1-(4) on the float (3) become closer, and the reed switch
) is turned on by receiving the magnetic attraction force of
7), the container (
It is detected and displayed that the liquid (2) in 1) has decreased to the reference level.

し発明が解決しようとする問題点] 従来の液面レベル検出装置は以上のように構成されてい
るので、液体(2)の液面レベルが変化しても、フロー
1〜(3)が何らかの原因で動かず、フロート(3)に
あるマグネット(4)とリードスイッチ(6)の位置間
隔が一定で変化せず、該リードスイッチが動作しなかっ
たり、または、リードスイッチ(6)がマグネット(4
)の遠近動作でON、OFF動作を繰返し、長期間の使
用で。
[Problems to be Solved by the Invention] Since the conventional liquid level detection device is configured as described above, even if the liquid level of the liquid (2) changes, flows 1 to (3) will not change in any way. The magnet (4) on the float (3) and the reed switch (6) may not move because of this, and the positional distance between the magnet (4) on the float (3) and the reed switch (6) is constant and does not change, and the reed switch does not operate, or the reed switch (6) is not connected to the magnet (6). 4
) for long-term use by repeating ON and OFF operations from near and far.

その接点消耗や接点表面への酸化皮膜のIff積により
、リードスイッ/−<6>が接触不良現象を発生するな
どの原因によって、容器(1)内の液体(′2)の液面
レベルを常時正確に検出できないという問題点があった
Due to contact wear and the If product of the oxide film on the contact surface, the reed switch /-<6> may cause a poor contact phenomenon, and the liquid level of the liquid ('2) in the container (1) may be constantly There was a problem that accurate detection was not possible.

本発明は、上記のような問題点を解消するためになされ
たもので、高信頼度、高粘度で液面レベルを検出するこ
とのできる液面レベル検出装置を得ることを目的と1−
る。
The present invention has been made to solve the above-mentioned problems, and aims to provide a liquid level detection device that can detect the liquid level with high reliability and high viscosity.
Ru.

[問題点を解決するための手段] 本発明にかかる液面レベル検出装置は、レンズ作用を有
する円筒形液面レベル検知管の両側面近傍に、光結合シ
ステムの一部の構成部品である発光ダイオードと受光ダ
イオードを対向設置し、液面レベルを検出するようにし
たものである。
[Means for Solving the Problems] The liquid level detection device according to the present invention includes a light emitting device, which is a part of the optical coupling system, near both sides of a cylindrical liquid level detection tube having a lens function. A diode and a light receiving diode are placed facing each other to detect the liquid level.

[作用] 本発明における発光ダイオードと受光ダイオードは、液
体が入っている円筒形液面レベル検知管の両側面近傍に
34向設置され、前記発光ダイオードから出た赤外光線
が前記円筒形液面レベル検知間の湾曲面を介して前記受
光ダイオードへ照射することにより、前記受光ダイオー
ドには液面レベルでもって変化する電流が流れ、この電
流変化状態を光結合システムの一部の構成部品である電
圧比較器により検出して、検知ブザーやソリッドステー
トリレーを駆動する。
[Function] The light-emitting diode and the light-receiving diode in the present invention are installed in 34 directions near both sides of a cylindrical liquid level detection tube containing liquid, and the infrared light emitted from the light emitting diode is directed toward the cylindrical liquid level. By irradiating the light receiving diode through the curved surface between the level sensors, a current that changes with the liquid level flows through the light receiving diode, and this current change state is detected by a component of a part of the optical coupling system. It is detected by a voltage comparator and drives a detection buzzer and solid state relay.

[発明の実施例] 以下、本発明の一実施例を図について説明する。[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第1図において、前記第8図と同一部分には同一符号を
付し、(10)は容器(1)の上下間口(Ia)、(1
b)間を、つなぐレンズ作用を有する塩化ビニール製等
の円筒形液面レベル検知管、(11)と(12)は円筒
管液面レベル検知管(10)をはさんで対向設置した赤
外線発光ダイオードと赤外線受光ダイオードである。
In FIG. 1, the same parts as in FIG.
b) A cylindrical liquid level detection tube made of vinyl chloride or the like that has a lens effect that connects the space, (11) and (12) are infrared light emitting devices installed opposite to each other with the cylindrical liquid level detection tube (10) in between. They are a diode and an infrared receiving diode.

上記赤外線発光ダイオード(11)と赤外線受光ダイオ
ード(12)は、第4図に示すように、夫々電流制御抵
抗(13)と同(14)を直列に接続して互いに並列接
続され、その一端は電源端子(15)に、他端はアース
(16)に接続されている。
The infrared light-emitting diode (11) and the infrared light-receiving diode (12) are connected in parallel with each other by connecting the current control resistor (13) and the current control resistor (14) in series, as shown in FIG. The other end is connected to a power terminal (15) and the ground (16).

次に動作について説明する。塩化ビニール製等の円筒形
液面レベル検知管(10)の中に入っている液体(2)
の液面レベルが、第2図に示すようにり。以上の場合、
赤外線発光ダイオード(11)から出た赤外光線は、上
記円筒形液面レベル検知管(10)の中にある液体(2
)のレンズ作用で集光され、赤外線受光ダイオード(1
2)に照射される。
Next, the operation will be explained. Liquid (2) contained in a cylindrical liquid level detection tube (10) made of vinyl chloride, etc.
The liquid level is as shown in Figure 2. In the above case,
The infrared light emitted from the infrared light emitting diode (11) hits the liquid (2) in the cylindrical liquid level detection tube (10).
) is focused by the lens action of the infrared receiving diode (1
2) is irradiated.

液体(2)の液面レベルがhlまで低下した場合、赤外
線発光ダイオード(11)から出る赤外光線は液体(2
)のレンズ作用や全反射現象により集光され、赤外線受
光ダイオード(12)へ液面レベルh。以上の光Sが照
Dj 7する。
When the liquid level of the liquid (2) drops to hl, the infrared light emitted from the infrared light emitting diode (11) will reach the level of the liquid (2).
) is focused by the lens action and total internal reflection phenomenon, and is transmitted to the infrared receiving diode (12) at the liquid level h. The above light S illuminates Dj7.

液体(2)の液面レベルがh2まで低下した場合、赤外
線発光ダイオード(11)から出る赤外光線は液体(2
)のレンズ作用や全反射現象が小さくなるため、空気中
への拡散量が増え、従って、赤外線受光ダイオ′−ド(
12)への照+1Jffiは、液面レベルh、h1と比
べ減少する。
When the liquid level of the liquid (2) drops to h2, the infrared light emitted from the infrared light emitting diode (11) will
), the lens action and total internal reflection phenomenon of the infrared receiving diode (
12) The illumination +1Jffi decreases compared to the liquid level h, h1.

液体(2)の液面レベルが第3図に示すようにh3まで
低下した場合、赤外線発光ダイオード(11)から出る
赤外線は、空気中への拡散量がh2以上に増え、従って
赤外線受光ダイオード(12)への照射量は著しく減少
する。
When the level of the liquid (2) drops to h3 as shown in Figure 3, the amount of infrared rays emitted from the infrared light emitting diode (11) diffuses into the air increases to more than h2, and therefore the infrared light receiving diode (11) diffuses into the air more than h2. 12) is significantly reduced.

上記液体く2)の液面レベルに対する赤外線受光ダイオ
ード(12)の受光電流、受光電圧特性は、第5図に示
すとおりである。この特性を応用した光結合システムの
回路構成を第4図に示す。
The light receiving current and light receiving voltage characteristics of the infrared light receiving diode (12) with respect to the liquid level of the liquid 2) are as shown in FIG. FIG. 4 shows the circuit configuration of an optical coupling system that applies this characteristic.

第4図において、赤外線受光ダイオード(12)と電流
制御抵抗(14)の直列回路に対して並外に電圧調整抵
抗(17)と同(18)の直列回路が並列に接続されて
いる。この赤外線受光グイオード(12)と゛電流制御
抵抗(14)の接続点P1は電圧比較器(19)の反転
入力端子に接続され、電圧調整抵抗(17)と同(18
)の接続点P2は上記電圧比較器(19)の非反転入力
端子に接続され、この電圧比較器(19)の出力端子に
検知ブザー(7)とソリッドステートリレー(9)が接
続されている。
In FIG. 4, a series circuit of an infrared light receiving diode (12) and a current control resistor (14) is connected in parallel with a voltage adjustment resistor (17) and a series circuit (18). The connection point P1 between the infrared receiving diode (12) and the current control resistor (14) is connected to the inverting input terminal of the voltage comparator (19), and the voltage adjusting resistor (17) and the same (18
) is connected to the non-inverting input terminal of the voltage comparator (19), and the detection buzzer (7) and solid state relay (9) are connected to the output terminal of this voltage comparator (19). .

赤外線発光ダイオード(11)から電流制御抵抗(13
)で規定されたある一定の光量が、赤外線受光ダイオー
ド〈12)へ照射されることにより、赤外線受光ダイオ
ード(12)に電流制御抵抗(14)で規定された受光
電流が流れる。このとき、液体(2)の液面限界レベル
h2に対する基11!電圧■ (水の場合)、v ″(
灯油の場合)が、電圧調整抵抗(17)と(18)との
接続点P2から電圧比較器(19)の非反転側に入力さ
れている。
From the infrared light emitting diode (11) to the current control resistor (13)
) is irradiated onto the infrared light receiving diode (12), so that a light receiving current defined by the current control resistor (14) flows through the infrared light receiving diode (12). At this time, the base 11! for the liquid level limit level h2 of liquid (2)! Voltage ■ (for water), v ″(
(in the case of kerosene) is input to the non-inverting side of the voltage comparator (19) from the connection point P2 between the voltage adjustment resistors (17) and (18).

従って、例えば液体(2)が水でその液面レベルがり。Therefore, for example, if liquid (2) is water, the liquid level will rise.

、hlの場合、上記基準電圧V2より高い受光電圧V。, hl, the light receiving voltage V is higher than the reference voltage V2.

1v1が電圧比較器(1つ)の反転側に入力されるため
、電圧比較器(19)の出力は第7図の特性例に示すよ
うに低(L)状態にあり、従って検知ブザー(7)やソ
リッドステートリレー(9)は駆動しない。
1v1 is input to the inverting side of the voltage comparator (1), the output of the voltage comparator (19) is in a low (L) state as shown in the characteristic example of FIG. ) and solid state relay (9) are not driven.

液面レベルがh  、h  に低下した場合、上記基準
電圧V2より低い受光電圧V2.V3が電圧比較器(1
9)の反転側に入力されるため、電圧比較器(19)の
出力は第7図の特性例に示すように高(1])状態とな
り、従って検知ブザー(7)やソリッドステートリレー
(9)が駆動して、液面レベルの低下に対するアラーム
警報を発する。
When the liquid level drops to h 2 , h 2 , the light receiving voltage V2. is lower than the reference voltage V2. V3 is the voltage comparator (1
9), the output of the voltage comparator (19) becomes high (1) as shown in the characteristic example in Figure 7, and therefore the detection buzzer (7) and solid state relay (9) ) is activated to issue an alarm warning for low liquid level.

なお、液体(2)が灯油の場合もその液面レベルh  
、h  、h  、h3の変化に対しても受光電圧が〜
’  ′、v  ′、v  ”、v3′のように変化し
、基準電圧V ′との関係によって、上記液体が水の場
合と同様なシーケンス動作を示づ。
In addition, when the liquid (2) is kerosene, the liquid level h
, h , h , and h3, the light-receiving voltage changes ~
'', v ', v ', v3', and depending on the relationship with the reference voltage V ', a sequence operation similar to that in the case where the liquid is water is shown.

[発明の効果] 以上のように、本発明によれば、容器中の液面レベルを
、上下間口間をつなぐレンズの作用を有する円筒形液面
検知管に、光結合システムをイリ加して検知するように
構成したので、高信頼度、m5精度を有する液面レベル
検出装置が得られる効果がある。
[Effects of the Invention] As described above, according to the present invention, an optical coupling system is added to a cylindrical liquid level detection tube having the function of a lens that connects the upper and lower openings to measure the liquid level in a container. Since it is configured to detect the liquid level, it is possible to obtain a liquid level detection device having high reliability and m5 accuracy.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す液面レベル検出装置の
正面図、第2.3図はその要部の拡大図、第4図は赤外
線発光ダイオードと赤外線受光ダイオードの回路構成図
、第5図は液面レベルに対する赤外線受光ダイオードの
受光電流、受光電圧の特性図、第6図は光結合システム
の回路構成図、第7図は電圧比較器の出力特性図、第8
図は従来の液面レベル検出装置の構成図、第9図はその
回路構成図、第10図はリードスイッチの作用説明図で
ある。 図にJ3いて(1)は容器、(2)は水又は灯油の液体
、(7)、くっ)は被作動機器(検知ブザ−、ソリッド
ステートリレー)、(10)は円筒形液面レベル検知管
、(11)は赤外線発光ダイオード、(12)は赤外線
受光ダイオード、(19)は電圧比較器である。 なお、各図中、同一符号は同−又は相当部分を承り。 代理人 弁理士  大 岩 増 雄 (外2名) 第1図 第2図   第3図 第4図 Vl、c 第5図 h1h□   h+             haC
溝a+Fl琴レヘしルJ 端面レタル 第6図 第7図
Fig. 1 is a front view of a liquid level detection device showing an embodiment of the present invention, Figs. 2 and 3 are enlarged views of its main parts, Fig. 4 is a circuit configuration diagram of an infrared light emitting diode and an infrared light receiving diode, Fig. 5 is a characteristic diagram of the light receiving current and light receiving voltage of the infrared light receiving diode with respect to the liquid level, Fig. 6 is a circuit diagram of the optical coupling system, Fig. 7 is an output characteristic diagram of the voltage comparator, and Fig. 8
The figure is a block diagram of a conventional liquid level detection device, FIG. 9 is a circuit block diagram thereof, and FIG. 10 is a diagram explaining the operation of a reed switch. In the figure, in J3, (1) is a container, (2) is a liquid such as water or kerosene, (7) and (k) are activated equipment (detection buzzer, solid state relay), and (10) is a cylindrical liquid level sensor. (11) is an infrared light emitting diode, (12) is an infrared light receiving diode, and (19) is a voltage comparator. In each figure, the same reference numerals refer to the same or equivalent parts. Agent Patent attorney Masuo Oiwa (2 others) Figure 1 Figure 2 Figure 3 Figure 4 Vl, c Figure 5 h1h□ h+ haC
Groove a+Fl harp level J End surface retal Fig. 6 Fig. 7

Claims (2)

【特許請求の範囲】[Claims] (1)容器の上下開口間をつなぐレンズ作用を有する円
筒形液面レベル検知管と、この円筒形液面レベル検知管
をはさんで対向配設した発光ダイオードと、該発光ダイ
オードから出た光線が該円筒形液面レベル検知管の湾曲
面を介して集光された状態で入射する受光ダイオードと
、この受光ダイオードの出力電圧を基準電圧と比較する
電圧比較器と、前記容器内の液面低下により前記受光ダ
イオードの出力電圧が基準電圧より高くなったときの前
記電圧比較器の出力を受けて作動する被作動機器とを備
えた液面レベル検出装置。
(1) A cylindrical liquid level detection tube with a lens function that connects the upper and lower openings of the container, a light emitting diode placed oppositely across the cylindrical liquid level detection tube, and a light beam emitted from the light emitting diode. a light-receiving diode into which the light enters in a condensed state through the curved surface of the cylindrical liquid level detection tube; a voltage comparator for comparing the output voltage of the light-receiving diode with a reference voltage; and a liquid level in the container. A liquid level detection device comprising: an actuated device that operates in response to the output of the voltage comparator when the output voltage of the light receiving diode becomes higher than a reference voltage due to a voltage drop.
(2)発光ダイオードと受光ダイオードは、赤外線ダイ
オードであることを特徴とする特許請求の範囲第(1)
項記載の液面レベル検出装置。
(2) Claim (1) characterized in that the light emitting diode and the light receiving diode are infrared diodes.
The liquid level detection device described in Section 1.
JP18810785A 1985-08-27 1985-08-27 Liquid level detecting instrument Pending JPS6247521A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18810785A JPS6247521A (en) 1985-08-27 1985-08-27 Liquid level detecting instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18810785A JPS6247521A (en) 1985-08-27 1985-08-27 Liquid level detecting instrument

Publications (1)

Publication Number Publication Date
JPS6247521A true JPS6247521A (en) 1987-03-02

Family

ID=16217823

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18810785A Pending JPS6247521A (en) 1985-08-27 1985-08-27 Liquid level detecting instrument

Country Status (1)

Country Link
JP (1) JPS6247521A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100495425B1 (en) * 1998-02-24 2005-09-15 삼성전자주식회사 Oil detection device and automatic oil supply device using laser
CN103687933A (en) * 2011-08-15 2014-03-26 三菱重工业株式会社 Char recovery device and char feeding hopper
CN109855697A (en) * 2017-11-30 2019-06-07 深圳市美好创亿医疗科技有限公司 Water quantity monitoring system, monitoring method and humidifier

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100495425B1 (en) * 1998-02-24 2005-09-15 삼성전자주식회사 Oil detection device and automatic oil supply device using laser
CN103687933A (en) * 2011-08-15 2014-03-26 三菱重工业株式会社 Char recovery device and char feeding hopper
US9388349B2 (en) 2011-08-15 2016-07-12 Mitsubishi Heavy Industries, Ltd. Char recovery system and char feeding hopper
CN109855697A (en) * 2017-11-30 2019-06-07 深圳市美好创亿医疗科技有限公司 Water quantity monitoring system, monitoring method and humidifier

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