JPS581371B2 - level detector - Google Patents
level detectorInfo
- Publication number
- JPS581371B2 JPS581371B2 JP15976278A JP15976278A JPS581371B2 JP S581371 B2 JPS581371 B2 JP S581371B2 JP 15976278 A JP15976278 A JP 15976278A JP 15976278 A JP15976278 A JP 15976278A JP S581371 B2 JPS581371 B2 JP S581371B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric element
- level
- electrode
- detected
- voltage
- 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.)
- Expired
Links
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
【発明の詳細な説明】
本発明は流体、粉体、粒体等のレベルを検知するセンサ
が圧電素子で構成されたレベル検知器に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a level detector in which a sensor for detecting the level of fluid, powder, particles, etc. is composed of a piezoelectric element.
従来はレベル検知器として、超音波を用いたり、サーミ
スタの自己発熱を利用したりする等のものがあった。Conventionally, there have been level detectors that use ultrasonic waves or the self-heating of a thermistor.
しかし、超音波を利用したものでは超音波発信部、受信
部が必要であり、この取付精度が要求される等の問題が
ある。However, those that utilize ultrasonic waves require an ultrasonic transmitting section and a receiving section, and there are problems such as requiring precision in mounting these sections.
一方、サーミスタの自己発熱を利用するものでは、被検
知物が粉体では使えない等の制限があった。On the other hand, devices that utilize the self-heating of a thermistor have limitations such as the inability to use powder as the object to be detected.
本発明は上記欠点を除去し、かつ制御回路も簡単にでき
るレベル検知器を提供するものである。The present invention provides a level detector which eliminates the above-mentioned drawbacks and whose control circuit can be simplified.
以下、図面とともに本発明の一実施例について説明する
。An embodiment of the present invention will be described below with reference to the drawings.
第１図は本発明に係るレベル検知用センサの回路図であ
り、１は圧電磁器板、２は磁器板１の一方の面に設けら
れた電極、３および４は磁器板１の他方の面に分割して
設けられた分割電極であり、このようにレベル検知用セ
ンサの圧電素子５は構成されている。FIG. 1 is a circuit diagram of a level detection sensor according to the present invention, in which 1 is a piezoelectric ceramic plate, 2 is an electrode provided on one side of the ceramic plate 1, and 3 and 4 are on the other side of the ceramic plate 1. The piezoelectric element 5 of the level detection sensor is configured in this way.
Ｐ，〜Ｐ４は端子であり、端子Ｐ１，Ｐ２間に圧電素子
５を機械的に振動させる交流電圧またはパルス電圧を加
え、端子Ｐ３，Ｐ４間よりレベル検知信号電圧を取出す
。P and -P4 are terminals, and an AC voltage or pulse voltage for mechanically vibrating the piezoelectric element 5 is applied between the terminals P1 and P2, and a level detection signal voltage is taken out between the terminals P3 and P4.
また、端子Ｐ２，Ｐ４は共通端子である。Further, terminals P2 and P4 are common terminals.
第２図にレベル検知用センサに用いた圧電素子５の一実
施例を示している。FIG. 2 shows an embodiment of the piezoelectric element 5 used as a level detection sensor.
第３図に圧電素子５をケーシングした実装状態を示して
おり、ケース部６の振動板７に圧電素子５が貼付けられ
ており、８は流体等の被検知物である。FIG. 3 shows the mounting state of the piezoelectric element 5 in a casing, in which the piezoelectric element 5 is attached to the diaphragm 7 of the case part 6, and 8 is an object to be detected, such as a fluid.
今、第４図に示すように圧電素子５に入力電圧Ｅｉｎを
加え、出力電圧Ｅｏｕｔを取出す。Now, as shown in FIG. 4, an input voltage Ein is applied to the piezoelectric element 5, and an output voltage Eout is taken out.
第５図。Figure 5.
第６図に圧電素子５がａ，ｂ方向（すなわち被検知物８
０レベルの変化する方向に対してほぼ平行）に振動して
いる状態を示している。FIG. 6 shows that the piezoelectric element 5
This shows a state of vibration (almost parallel to the direction in which the 0 level changes).
圧電素子５がａ，ｂ方向に振動することにより、圧電素
子５を貼付けてある振動板７がｃ，ｄ方向（ａ，ｂ方向
に直角な方向）に振動する。When the piezoelectric element 5 vibrates in the a and b directions, the diaphragm 7 to which the piezoelectric element 5 is attached vibrates in the c and d directions (directions perpendicular to the a and b directions).
そして、被検知物８が多くあり、圧電素子５が被検知物
８中に埋没している時には、振動は抑制され出力電圧Ｅ
ｏｕｔは小さい。When there are many detected objects 8 and the piezoelectric element 5 is buried in the detected objects 8, the vibration is suppressed and the output voltage E
out is small.
逆に被検知物８が少なくなり、圧電素子５が被検知物８
より外へ出た時、振動の抑制は解かれ大振幅動作し出力
電圧Ｅｏｕｔは大きくなる。Conversely, the number of detected objects 8 decreases, and the piezoelectric element 5
When it goes further outside, the vibration suppression is released, large amplitude operation occurs, and the output voltage Eout becomes large.
この時の被検知物８のレベルの様子を第７図Ａ，Ｂ，Ｃ
に示Ｌ１Ｅｉｎが交流電圧、パルス電圧の場合のＥｏｕ
ｔをそれぞれ第８図Ａ，Ｂ，Ｃ，第９図Ａ，Ｂ，Ｃに示
している。The level of the detected object 8 at this time is shown in Figure 7 A, B, and C.
Eou when L1Ein is AC voltage or pulse voltage shown in
t are shown in FIGS. 8A, B, and C, and FIGS. 9A, B, and C, respectively.
Ａは被検知物８が多く、圧電素子５がその中に埋没して
いる場合で出力電圧は小さい。In case A, there are many objects 8 to be detected and the piezoelectric element 5 is buried therein, and the output voltage is small.
Ｂは被検知物８が少し減り、圧電素子５が半分ほど外に
出た場合で出力電圧は少し大きくなる。In case B, the detected object 8 decreases a little and the piezoelectric element 5 comes out about half, and the output voltage increases a little.
Ｃは被検知物８が少なくなり圧電素子５が完全に外に出
た場合で出力電圧は大きくなる。C indicates a case where the number of detected objects 8 decreases and the piezoelectric element 5 completely comes out, and the output voltage increases.
この出力電圧を検出して被検知物のレベルを検知するこ
とができる。By detecting this output voltage, the level of the object to be detected can be detected.
以上のように本発明は構成されているものであり、非常
に簡単な構成でもって被検知物のレベルを知ることがで
き、かつ流体、粉体、粒体等のいずれの被検知物にも適
用することができるものであり、その実用性は大なるも
のである。The present invention is constructed as described above, and it is possible to know the level of the detected object with a very simple structure, and it can be applied to any detected object such as fluid, powder, granules, etc. It can be applied, and its practicality is great.
第１図は本発明に係るレベル検知器のレベル検知用セン
サの回路図、第２図は同レベル検知用センサに用いた圧
電素子の一例を示す斜視図、第３図は同圧電素子をケー
シングした実装状態を示す説明図、第４図は同圧電素子
に入力電圧Ｅｉｎを加え出力電圧Ｅｏｕｔを取出す回路
図、第５図および第６図は同実装状態の圧電素子が振動
している状態を示す説明図、第７図Ａ，Ｂ，Ｃは同圧電
素子と被検知物のレベルとの関係を示す説明図、第８図
Ａ，Ｂ，Ｃおよび第９図Ａ，ＢｊＣは第７図Ａ，Ｂ，Ｃ
に対応するそれぞれ交流電圧、パルス電圧を加えた時の
出力電圧を示す波形図である。
１・・・・・・圧電磁器板、２・・・・・・対向面の電
極、３，４・・・・・・分割電極、５・・・・・圧電素
子、７・・・・・・振動板、８・・・・・・被検知物。Fig. 1 is a circuit diagram of a level detection sensor of a level detector according to the present invention, Fig. 2 is a perspective view showing an example of a piezoelectric element used in the same level detection sensor, and Fig. 3 is a casing of the same piezoelectric element. FIG. 4 is a circuit diagram for applying an input voltage Ein to the same piezoelectric element to obtain an output voltage Eout, and FIGS. 5 and 6 are diagrams showing a state in which the piezoelectric element in the same mounted state is vibrating. 7A, B and C are explanatory diagrams showing the relationship between the same piezoelectric element and the level of the object to be detected, and FIGS. 8A, B, C and 9A and BjC are 7A ,B,C
FIG. 3 is a waveform diagram showing output voltages when an AC voltage and a pulse voltage are applied, respectively. 1... Piezoelectric ceramic plate, 2... Electrode on opposing surface, 3, 4... Divided electrode, 5... Piezoelectric element, 7... - Vibration plate, 8... Object to be detected.
Claims (1)
の電極を２分割し、この分割した一方の電極を入力電極
とし対向面の電極との間に上記圧電磁器板を機械的に振
動させる交流電圧またはパルス電圧を印加し１分割され
た他方の電極を出力電極とし上記対向面の電極との間よ
りレベル検知信号を取り出すよう構成した圧電素子を振
動板に貼付け、流体、粉体、粒体等の被検知物のレベル
の変化する方向に対して上記圧電素子がほぼ平行に振動
するよう駆勤し、上記被検知物のレベルの大小により上
記レベル検知信号電圧が変化するよう構成したことを特
徴とするレベル検知器。1 Electrodes are provided on both sides of a piezoelectric ceramic plate, and the electrode on one side is divided into two, and one of the divided electrodes is used as an input electrode, and an alternating current that mechanically vibrates the piezoelectric ceramic plate between it and the electrode on the opposite side. A piezoelectric element configured to apply a voltage or pulse voltage, use the other divided electrode as an output electrode, and extract a level detection signal from between the electrodes on the opposing surface is attached to a diaphragm, The piezoelectric element is vibrated almost parallel to the direction in which the level of the object to be detected changes, and the level detection signal voltage is changed depending on the level of the object to be detected. Features a level detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15976278A JPS581371B2 (en) | 1978-12-20 | 1978-12-20 | level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15976278A JPS581371B2 (en) | 1978-12-20 | 1978-12-20 | level detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5583818A JPS5583818A (en) | 1980-06-24 |
| JPS581371B2 true JPS581371B2 (en) | 1983-01-11 |
Family
ID=15700703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15976278A Expired JPS581371B2 (en) | 1978-12-20 | 1978-12-20 | level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS581371B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5919816A (en) * | 1982-07-27 | 1984-02-01 | Chiyoda Seisakusho:Kk | Level gauge |
| US4565942A (en) * | 1983-07-01 | 1986-01-21 | Murata Manufacturing Co., Ltd. | Energy trapped piezoelectric resonator liquid sensor |
| KR100854190B1 (en) * | 2004-04-19 | 2008-08-26 | 세이코 엡슨 가부시키가이샤 | Liquid container |
| KR101038777B1 (en) | 2009-12-11 | 2011-06-03 | (주)블렛스인더스트리 | Receiving and distributing electricity equippment for saving power |
-
1978
- 1978-12-20 JP JP15976278A patent/JPS581371B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5583818A (en) | 1980-06-24 |
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