JPS5931417A - Liquid level switch - Google Patents

Abstract

PURPOSE:To display stable performance which hardly causes an error in measurement, by detecting the oscillation frequency variation of an oscillator consisting of one side of a voltage vibrator and an amplifier by the resonance characteristic of the other side of the voltage vibrator. CONSTITUTION:A liquid level switch has the 1st piezoelectric vibrator 10 and the 2nd piezoelectric vibrator 12 which have mutually uniform characteristics, and the vibrating surface 14 of the 1st piezoelectric vibrator 10 is positioned where detection is performed; the oscillator 18 consists of the 1st piezoelectric vibrator 10 and the 1st amplifier 16, the oscillation output of the oscillator 18 is supplied to the 2nd vibrator 12, and the resonance output of the 2nd vibrator 12 is regarded as a detection output. Then, the oscillation frequency variation of the oscillator 18 is detected by the resonance characteristic of the 2nd piezoelectric vibrator 12 to display the stable performance which hardly causes an error in measurement.

Description

【発明の詳細な説明】 この発明は液面１ノベルスイツプに関（）、特番Ｊ容器
内四の液面レベル情＋ｌｉを電気的信号に礎換りる液面
レヘルスイツブ１．−関りる１゜ 従来のこの秒の液面レベル１八報を外部に送出りる手段
どしく’　ｌ；Ｉ、例λば静電容７．ｉ逼式ｔＡＬｌ波
ｊ（。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid level switch (1), which converts liquid level information +li in a special number J container into an electrical signal. -Related 1゜What is the conventional means for sending out the liquid level 18 report of this second to the outside? i-type tALLl wave j(.

）Ｉ’：Ｉ　−ｌ−スーｒツチ式ｑのに・うに多くの１
段が１１−供されている。)I':I -l-Such formula q of uni-unimany 1
11 stages are provided.

しかしイｆがら。これらの６式（こあつ（はい−リ゛れ
６次の、にうＧ問題１１°、九を右りるものであった。But if. These 6 formulas were 6th order, 11° and 9 right.

！Ｉなわｌ）、静電容品式はシｌいに極く狭ｂｚ−ｓ！
ｔ−ツブを形成りる一対の測定゛小極を使用し、この電
（船間の静電容（ｄが媒質にＪ、つ（変化４ることを検
出Ｊるｔ）の（・あるか、電１（ｉ　ｌこ異物や水分が
（−１ン’ｌ′ＩＪることに、」、る測定ｉｊｉ差を／
１じ亡Ｊく、まｌＪ超音波り式は光Ｉｋｊ器と受イδ器
を用いで超音波の伝播時間が、媒ｖ′（により異イＣる
ことを利用りるものであるが、測定対象１ジノの２ん１
度あるいは淫逅Ｏノの存在により測定１１？ｊ差を４１
じたり、あるいは測定対象物の投入へ等の外米♀ＩＩ音
にＪ、・）でも著しく影響を受（ｊる欠１ｊ＋ｊかあっ
た。! I), the capacitance type is very narrow bz-s!
Using a pair of small poles forming a t-tube, we determine whether this voltage (the capacitance between the vessels (d) is J in the medium, and (detects a change J t), If foreign matter or moisture is (-1'l'l'IJ), then the measured difference is /
However, the ultrasonic method uses an optical Ikj device and a receiver δ device, and takes advantage of the fact that the propagation time of the ultrasonic wave is different depending on the medium v' (C). Measurement target 1 Gino 2-1
Measured 11 by degree or presence of lewdness? j difference is 41
It was also significantly affected by the sound of foreign rice ♀ II, such as when directly or when the object to be measured was input.

そし−Ｃ）［１−トスイッチ一式は、）自−１・の浮、
１位首の変化にＪ：って機械接点を直１ｇ駆１ノづるｂ
のであっ（，１−述した欠点はない−ｔ）のの、桟（１
４に仏（ｒづる痘合いが大きいため、形状が大きくなり
設置位装置に制限をう（］るという欠点がイ１つだ。So-C) [1-to switch set is) self-1. floating,
When the first place number changed, J: turned the mechanical contact directly 1g drive 1 nozuru b
So (, 1 - there is no mentioned drawback - t), the crosspiece (1
One disadvantage is that it has a large size, which limits the installation position of the device.

このような従来の液面検出手段の問題点を解消ＩＪ’／
＼く、ｆタン酸ハリウ／−Ｘ等の圧゛小体の共振周波数
が周囲の媒質にＪ、ｎて変わることを利用したブノ式ち
Ｉ！Ｉ！　Ｍ’ｃ５れているｈ′Ｘ、空気中と液体中の
共振層ｆ皮数の変化を検出（）る１段どして、比較用の
ＪＡＱＥ周波数周波数光１等回路四２どりるｌ、：めに
電気的な構成／）＜　？Ｊ！　＆Ｉｆ化し、Ｉ「）　ｈ
ｊｌ　Ｍ出対象物１”　ｉｌｌ！Ｉ定ＪＷ　１ｍ　（７
）　：Ｗ１α変化（Ｊｌ・］（）ては複容重　！＋−，
ｉｌ　ｆｔ１回路舌を６１加して而・倒％調整を行くし
）必要かあるどいつ問題点をイ」し−（いＬ：。Eliminating these problems with conventional liquid level detection means, IJ'/
The Buno method takes advantage of the fact that the resonant frequency of a barium material such as halium tannate/-X changes depending on the surrounding medium! I! M'c5 h'X, 1 stage to detect the change in resonance layer f skin number in air and liquid, JAQE frequency frequency optical first class circuit 42Driru l for comparison, ：Meni electrical configuration／）＜ ? J! &If, I”) h
jl M output object 1" ill! I constant JW 1m (7
):W1α change (Jl・]() is the compound weight!+-,
I'll add 61 points to the ft1 circuit and adjust the %.) If necessary, I'll address the problems. (I L:.

この弁明はこのＪ、うな問題点に鑑みイＣされたもので
、での目的どりるどころは、１ｊボしｌ、：液面レベル
メイッｙにａ３い−（、ＨＡ　Ｖｉ４的（１η成及び電
気的構成をそれ稈ルｆｆｌ　ＩＬ、りることなく、ｗ物
も゛の（す着あるい（３１被検出対象物１１Ｉｉｌｌ’
ｌ　’；ｉ″環１ノ’ｉ　ｑ）　ｉ轟ａ　／α変化、外
来銘畠（＋７の１蹟乱に対し−（１ｌｌｌｌ　’ｊ’Ｑ
誤差を牛じ腑い安−ｊでしたｌ’ｌ　ｆｉｆｉを介挿し
、［１つ被検出対象物や設置個所にり・１し自由１αの
人３へい一１ンパクＩ・で堅牢イ「液面レベルスイッチ
を（１工１供づると（−６に−ある。This defense was made in view of the above problems, and the purpose of this explanation is that it is not possible to achieve the objective in 1j, but the liquid level is very high, and a3 is high. The configuration of the target object is ``(31 Object to be detected 11 Iill'
l';i''ring 1 no'i q) i Todoro a /α change, foreign name field (for one disturbance of +7 - (1lllll 'j'Q
It was easy to avoid errors, but I inserted the fifi into the object to be detected and the installation location. The surface level switch is located at (-6).

この１−１的を達成りるＩ、：め、この発明は同−待↑
］１をＶｉ　７Ｊる２個の打電ｊ辰動ｒを自〔）、一方
の振動ｒど増幅器ど（ブと振器を構成する液面レンリー
において、発振器の光り周波数変化を他方の圧電振Ｍ子
に）ｊえ、この他方のＩｆ　′ｆＩｉ振動子の共娠特↑
１にＪ、っ−（検出りるＪ、うに（〕たことを特徴どり
るちのである。Achieving this goal 1-1: I, this invention is waiting for the same ↑
] 1 to Vi 7J, two electric currents are connected to one vibration amplifier, and the other piezoelectric oscillation M ) If this other If'fIi oscillator's co-pregnancy special ↑
1 is characterized by J, t-(detected J, sea urchin).

ノズトにＬ　（７）発明のりｆｊ−イｄ」例に′つぃ（
添１イ・１図面（！参照し説明りる。(7) For example,
Please refer to Attachment 1 A.1 Drawing (!) for explanation.

第１図はこの発明の係る液面ｌノベルスイッチを示Ｊ−
実施例で・ある。この実施例にｊＪ３いては、油面Ｌ／
　／＼／ｌ／　スイｉ７　ｆ　ｔ、Ｌ　＃２　イ１．１
：　１４１’ｌ　１７）　ＩＩｙｌ−）　７．、：　＆
１１　（１）　Ｉ−１’゛市振勅子１０とり）２の圧電
振動子１２どをｈし、第１の月電（朴動了１ｏの振動面
１４を被検出個所に位置せしめ、前記第１の圧電振動子
１ｏと第１の増幅器１６とで発振器１８を構成し、この
発振器１８の発振出力を前記第２の圧電振動子１２に与
え、この第２の圧電振動子１２の共振出力の状態（第３
図下欄に示Ｖ）を検出用ノｊとなずちの−（゛ある。FIG. 1 shows a liquid level novel switch according to the present invention.
This is an example. In this example, for jJ3, the oil level L/
/\/l/ Sui i7 f t, L #2 I1.1
: 141'l 17) IIyl-) 7. , : &
11 (1) Move the piezoelectric vibrator 12 of I-1'゛City Shinpaku 10) 2, position the vibrating surface 14 of the 1st monthly electric power (Pak 10) at the detection point, and The first piezoelectric vibrator 1o and the first amplifier 16 constitute an oscillator 18, and the oscillation output of this oscillator 18 is given to the second piezoelectric vibrator 12, and the resonance output of the second piezoelectric vibrator 12 is State (3rd
V) shown in the lower column of the figure is the detection nozzle J and the -(゛).

上記第１の圧電振動子１ｏは、所定形状のヂタン酸バリ
ウム等からなる圧電体２ｏを金属製の弾ｆ’ｌ薄板２２
　十１．ｍ接着剤等で貼るしてｈ’＋を成されでいる。The first piezoelectric vibrator 1o has a piezoelectric body 2o made of barium ditanate or the like having a predetermined shape, and a metal elastic thin plate 22.
11. h'+ is achieved by pasting m with adhesive or the like.

ぞしくこの第１の圧電１辰動了１０　ｆＪ、ノランジ状
をなし内部が中空なケース２４内に前記圧電体２０を内
側にしく収納され、このケースをタンク活′の液体容器
２６の壁面を貫通し）に、状（７９で、０リング苦のｊ
１１パッ−１ン゛２　ｏを挾み込み９７１〜３０４表Ｙ
ｌめｆＪＩＪ液体３２の漏出を防＋１−Ｌ）つつ、前記
振動面１−′Ｉを被検出対象物たるｉｌ＆体：＋　２　
＋：接接触能能位ｉ７’ｆ　Ｉ！　シめ−Ｃいる。Preferably, this first piezoelectric body 20 is properly housed inside a case 24 which has a hollow shape and has a hollow interior, and this case is placed against the wall surface of the liquid container 26 of the tank. Penetration), shape (79, 0 ring difficulty j
11 Patch 1゛2 Insert o and 971-304 table Y
While preventing the leakage of the JIJ liquid 32 (+1-L), the vibration surface 1-'I is used as the object to be detected:+2
+: Contact ability i7'f I! There is Shime-C.

ｌハ１）ブを振器゛１８は、Ｉｔ、ｌ！第１の圧電振動
子１０を構成りる月−電１４２０及び弾刊薄根２２上に
、蒸る等のノ）法で形成された少数の電極３２と上記第
１の増幅器゛１６どをり〜ト線３／ｌで接続りること（
１昂成されている。1) Shake the bar 18. It, l! A small number of electrodes 32 formed by a method such as steaming on the Gekiden 1420 and the Bulletin Usune 22 constituting the first piezoelectric vibrator 10 and the first amplifier 16. Connect with 3/l wire (
1 has been achieved.

イしてこの発振器１８の発振出力ｔＪ、上記第２の圧電
撮動子１２にｆｌ　！ｊｉｓれるものぐあり、この第２
の１［電振動子１２として（ま、上記第１のｎ：電振動
子１０ど同一の共振周波数特性を有Ｊるものであり、ｈ
ｌ−材料で製作されたものが最も望ましいか、ｊ【ｌｊ
−の’４Ｓｉ　ｌ’ｌを右りるものであれば他の振動ｆ
　Ｃ（Ｊ、Ａ（発明のＩｆ的を一遂成りること（；１可
ｆ＋ｈである。Then, the oscillation output tJ of this oscillator 18 is sent to the second piezoelectric sensor 12 as fl! There is a list of things that can be said about jis, this second one
1 [As the electric vibrator 12 (well, the above first n: the electric vibrator 10 has the same resonant frequency characteristics, h
Is it most desirable that it is made of l-material, j [lj
-'4Si l'l If it is right, other vibrations f
C(J, A(If the purpose of the invention is accomplished (;1 possible f+h.

史にこの実施１’ｙ’ｌ　（Ｊｄ；いては、１記第２の
Ｉｔ　７１　ＪＡＱ妨（１２（：　＋５：出され！、、
：出力ｌｉｊ村は、負〕２の増幅器ご３６に人力され、
ぞの出力／）〜レヘルスイッ１回路３８に人力され、レ
ベルスイッー１回路３８から外部に送出ｄれるＪ、うに
（１−１成さ゛れ（いる３゜次にこの実施例ｋ　Ｊ＞い
で、液体を検出しイの情ｔＵｔ−外？ｉｌｌ　ＩＺ　ｍ
出すル動ｆｉ−ＩＺ　−）　イー（’　ｉｕＪ明Ｊ６゜
まり°上記第１の月ｚ亀°振ｖＪ了１０の４力作で゛あ
る／１〜、−１記弾１１１をｔｂ　ＩＮ　２２が空気中
にある場合に（ま、負１２図ａに示すように圧電体２０
の外形、厚み等で決定されるＪξ振同周波数「０の振動
をなり。In history, this implementation 1'y'l (Jd; 1st Chapter 2nd It 71 JAQ disturbance (12(: +5: issued!,,
:The output lij village is manually powered by the negative]2 amplifier each 36,
The output of the sea urchin (1-1) is manually inputted to the level switch 1 circuit 38 and sent to the outside from the level switch 1 circuit 38. Shii's love tUt-outside? ill IZ m
It is the four masterpieces of the above first month Z turtle ° shaking v J Ryo 10 /1~, -1 bullet 111 tb IN 22 is air (Well, as shown in Figure 12a, the piezoelectric body 20
The Jξ vibrational frequency determined by the external shape, thickness, etc. is 0 vibration.

そして弾性ｉＷ板２２が液体中にある場合には、第２図
１）に示Ｊように油体と空気の粘付等の相違により機械
的インピーダンスが異イするため、△ｒだＩｆ低いＪＬ
撮同周波数ｒｌで振動をＪる。When the elastic iW plate 22 is in a liquid, the mechanical impedance is different due to the difference in viscosity between the oil body and air, as shown in FIG.
The vibration is captured at the same frequency rl.

このような第１の圧電振動子１０のＪｌ−銀層波数の変
化は、第３図中欄に示ザような、上記発振器１ε３０光
１ｈ’ｖ周波数の変化とイｉす、この変化の状態はＬ記
第２の圧電振動１”１２に付すされる。Such a change in the Jl-silver layer wave number of the first piezoelectric vibrator 10 corresponds to a change in the frequency of the oscillator 1ε30 light 1h'v, as shown in the middle column of FIG. 3, and the state of this change. is applied to the second piezoelectric vibration 1''12.

この第２の）ｆ電振動子１２は、第３３図下欄に示ｔＪ
、うイ「共振周波数特性を右りるｂのであり、従−）’
　−（’　ｌ’　Ｒｔシざｔ振器’Ｉ　Ｂ　ｈ日らのＩ
Ｆ、　ＪＡＧ周波数が［０即ら前記第１の圧′市振動子
１０が空気中にある場合には、最ｔ）良’ｊｆ　＜ｒ整
合状態にあるＩＪめ、月−電据動ｒ゛１２の出ノＪｃＬ
り′（Ｊ）図１・欄に承りＪ−うイｉ＾電１ｕ（Ｖｌ）
とイｉす、光ｌＡし器′１８からのフｔＪ辰周波数が［
１、即ら第１のｒ＋電振’４すｊ’ｒ　１０か液体中に
ある場合には、整合状態か悪くイ１６／、−め、低電１
１ン（ｖ２）どイｆ　る　１゜ このＪ、うにしく、Ｉ：　ｉｉＬ：釘（１の月電振動了
１０が、検出しだ液イホと空気どの共振周波数変化ｌｊ
、上記第２のｉＦ：　”ｆｌｉ振動子７２にＪ、す’ｔ
ｒｉ　ｊ＋’ｔの変化に変換される。ぞ（〕てこの電位
変化は、拘′！２の増幅器３６にＪ、り一定レベルまぐ
増幅（きれ、レベルスイッチ回路３Ｂに入力される。This second) f-electric vibrator 12 is shown in the lower column of FIG.
, ``The resonant frequency characteristics are determined by b, and the resonant frequency characteristics are determined by -)'
-('l' Rt shaker 'I B h day's I
F, if the JAG frequency is [0, i.e., the first pressure transducer 10 is in the air, then the best t) is the IJ in the matching state, the monthly electric station r゛12 no JcL
ri' (J) Figure 1/column J-Uii＾Electric 1u (Vl)
Then, the frequency from the optical amplifier '18 is [
1, that is, the first r + electric vibration '4 j'r
1 (v2) Do f ru 1゜This J, I: iiL: Nail (The monthly electric vibration of 1 is the resonance frequency change lj between the detected saliva and the air.
, the second iF: ``J to the fli oscillator 72''
It is converted into a change of ri j+'t. The potential change on the lever is amplified at a constant level by the amplifier 36 of the control circuit 2, and is input to the level switch circuit 3B.

この１ノベルスイッヂ回路ご３８は、インバーター等に
より構成し増幅器３６からの人力信号を反転し、りＩｂ
１（ＩＪ（、＝’；　ｊ−シをｉ２＋出するｂのであり
、前記第′１の圧電１敏動ｆ１０が空気中にある場合に
は、出力としくイ１（インピータンス“［″を送出し、
第１の月電娠動了１０がｄＨホ中にある場合には、出力
とし−Ｃ高インピーダンス“１１′°を送出Ｊる。ｌ、
Ｙ、　−）　（例えば１ノベルスイッｆ回路３８が出ツ
ノ側にシリ゛−を１８続りるど、前１ｉ１４第１のバー
電振動子１０が空気中に（ｆ（１りる騙ｊ７についＣの
みシリ゛−を鳴動δｕ１液体打器２６内の液面制御が１
り能となる。This one-novel switch circuit 38 is constituted by an inverter, etc., and inverts the human input signal from the amplifier 36.
1(IJ(,='; j-shi is output from i2+b, and when the '1st piezoelectric first impulse f10 is in the air, the output is I1(impedance "[") sending out,
When the first monthly power activation end 10 is in dH, the output is -C high impedance "11'°."
Y, -) (For example, 1 novel switch f circuit 38 continues 18 series on the exit horn side. C only sounds the series δu1 The liquid level control in the liquid batter 26 is 1.
It becomes Noh.

尚、液面４八ｆぷの検出は、Ｉ〕電撤動了がｉｌ＆体と
ＪＵ触し゛たどき共振周波数の変化にＬｌづいてなされ
るｌ［め、被検出対象物は水等に限定されるしので（７
く、例えば引火りる危険性のあるガソリン等に対しても
行える。Note that the detection of the liquid level of 48 f is performed based on the change in the resonant frequency when the electric withdrawal ends in contact with the body and body, so the object to be detected is limited to water, etc. Because it will be done (7)
For example, it can be applied to gasoline, etc., which may catch fire.

収十のようにこの発明の液Ｗルベルスイップでは、液面
状態を検出する圧電振動子ど同〜１！を性を自づるＩｆ
電電動動子用い液面状態の変化を電イ１７変化に変換せ
しめることにより、従来のように特別な信号弁１１−回
路が不要となり、比較的簡単な構成で液面情報の変換が
可能となるだけでなく、上記液面検出用の圧電振動体と
変換用の斤電振？ｈ体のｉＡＡ　Ｉす’１．’ｌ　１〕
１を・容易に一致、きｌ！るＪとがでさるため、被検出
夕・ｊ象物や測定環境の１Ａａ痘変化に対して特別イｃ
−ｆ段をｉｌｉ’：じることイｉ：　＜　、８１Ｈｊ：
誤２ｊ−をり【；ることなく安定した動ｒ１がｉ＋Ｊ能
どなる。。As a matter of fact, the liquid double level switch of this invention uses a piezoelectric vibrator to detect the liquid level condition. If you realize your gender
By converting changes in the liquid level state using an electric motor into changes in the electric motor, a special signal valve 11 circuit unlike the conventional one is no longer required, and liquid level information can be converted with a relatively simple configuration. Not only that, but also the piezoelectric vibrator for liquid level detection and the electric vibration for conversion? h-body iAA I'1. 'l 1]
1. Easily match! Therefore, special measures are required for 1Aa changes in the detected object and measurement environment.
−F stage ili': Digit i: < , 81Hj:
The stable motion r1 without the error 2j- becomes the i+J function. .

ま／＝液面状ｆｊｉ＜を検出りる月−電振動了１．１、
ｊ；ｉに振ｔ）＋しＣおＶ〕振動面に５″シ物舌の（−
Ｊイ１が防１１されるだ１、Ｊ　（’　＜＝　＜　、　
ｉｌｋ体゛ｆス器内の液面レベルの変化に対して４１勧
め（迅速に反応り、、応答性ｆ１に噛れる液面レベルス
イッｆ　−（”　ｂある。The moon-electrical vibration that detects the liquid surface state fji<1.1,
j; i t) + C O V] 5" shimono tongue (-
J I 1 is defense 11, D 1, J (' ＜= ＜ ,
There is a liquid level switch that responds quickly to changes in the liquid level in the liquid level switch (f-()) and has a responsiveness f1.

４、図面のｌ１ｉ７１１ｊイｊ−、ｗｌ明第１図はこの
発明の　実／ＪＩ！例を承り（既略図であり、第２図（
よ第１の圧電振ｍノ了の共振周波数特１４を示りｔ〕の
である３゜ 第３図はこの発明の液面レベルスイッチの主装部の電気
的１＼’Ｉ　ｔ／ｌを小１ものＣ’　＋ｋ＞す、下欄は
第２の圧電振動子の周波数特性を示し、中欄は発信器の
出力を示θものζ・あり、下欄１；ｉ　ｐｔ　２の１：
１：電振動了の出力を承りものて゛ある。4. Figure 1 of the drawings shows the fruit of this invention/JI! Accepting the example (this is a schematic diagram, Figure 2 (
Figure 3 shows the resonance frequency characteristic 14 of the first piezoelectric vibration m = t]. The lower column shows the frequency characteristics of the second piezoelectric vibrator, and the middle column shows the output of the oscillator.
1: It can accept the output of electric vibration.

Claims (1)

【特許請求の範囲】 ｌノい［７４，′ｒ　ｌ’ｌの１薗・）た第１　、第２
のハ電、振動子を４１し、＞：ｉの１電振動子の振動向
を被検出個所に位ｉ　１４　Ｌ／め、該第１のＪＴ　＋
市振勅二ｒど増幅器と【゛発振器を（１４成し、該発振
器の光１４周波数変化（Ｊ阜づい’Ｃ８ｋ　を本を検出
りる液面１？ンリーにａメいで、該発振器の発振出力を
該第２の圧電振動−ｒに与え、該第２のハ電据−’Ｊ〕
子の共振出力の状態を検出出力とする。Ｊ、うにしたこ
とを特徴とする液面レベルスイッチ、。[Claims] The first, second
The first JT +
The second amplifier and an oscillator (14) are used to detect the optical frequency change (J'C8k) of the oscillator, and the oscillation output of the oscillator is is applied to the second piezoelectric vibration -r, and the second piezoelectric vibration -'J]
The state of the resonant output of the child is the detection output. J. A liquid level switch characterized by sea urchin.