JPS604820A - Small sized vibration type level detector - Google Patents
Small sized vibration type level detectorInfo
- Publication number
- JPS604820A JPS604820A JP11307083A JP11307083A JPS604820A JP S604820 A JPS604820 A JP S604820A JP 11307083 A JP11307083 A JP 11307083A JP 11307083 A JP11307083 A JP 11307083A JP S604820 A JPS604820 A JP S604820A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- level detector
- vibration
- voltage conversion
- powder
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（］）発明のＬＩ的
本発明は、容器内における粉体、粒体、液体等のレベル
変化を検出するための小形振動式１ノベル検出器に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION (]) LI aspect of the invention The present invention relates to a small vibrating one-novel detector for detecting level changes of powder, granules, liquid, etc. in a container.
従来の振動式レベル検出器は、第１図に示すような構造
であり、振動板１′が機械的共振点で振動した場合に最
も効率よく粉体等の被検出物′Ｉｒ：ＰＩ＆知すること
ができる。A conventional vibrating level detector has a structure as shown in Fig. 1, and detects the detected object such as powder most efficiently when the diaphragm 1' vibrates at a mechanical resonance point. be able to.
しかしながら、この柚の従来の検出器において小形のも
のを製作するためには伽勤板１′を小径にしなければな
らず、振動板ｌ／を小径にすれは固有共振周波数が高く
なると共に振動振幅が減少することになシ、そのため、
共振点が可聴周波数帯域であれば非常に耳障シな音とな
る。そして振幅が減少すると検出感度が高くな多過ぎて
作動が不安定になると共に外部の振動等による影響を受
け易くなシ、しかも振動板Ｐの検出面に付着する粉体や
粘性液体を排除する力も弱まるので、誤作動の要因とな
る辱種々の欠点が派生する。However, in order to manufacture a compact conventional detector, the diameter of the diaphragm plate 1' must be made small, and as the diameter of the diaphragm l/ is made small, the natural resonant frequency becomes high and the vibration amplitude increases. is expected to decrease, therefore,
If the resonance point is in the audible frequency range, the sound will be very harsh to the ears. When the amplitude decreases, the detection sensitivity becomes too high, which makes the operation unstable and susceptible to external vibrations, etc. Moreover, it eliminates powder and viscous liquid that adhere to the detection surface of the diaphragm P. Since the power is also weakened, various defects arise that can cause malfunctions.
共倣周波＆を下げる手段として、振動板１′の板厚を薄
くしたシ或いは弾性の低い材質を使用するのも一法であ
るが１強度の低下を伴ｆｘ９ことは免れ得ない。As a means of lowering the resonance frequency &, one method is to reduce the thickness of the diaphragm 1' or to use a material with low elasticity, but this inevitably involves a decrease in strength.
共振周波数での駆動以外の方法を月いる場合の欠点とし
て、振幅を大きくする場合は７１１１振方を強める必要
があジ、また、耳障シな周波数の音の対策としては、音
量を下げるか或いは超音波領域を使用する方法があるか
、前者（Ｊ圧電磁器板の加振力の強いものを必要とする
と共に検出感度が悪化するという欠点があり、後者は感
度が高くなって不安定になり易い等の欠点がある。The disadvantage of using a method other than driving at a resonant frequency is that if you want to increase the amplitude, you need to strengthen the 7111 vibration, and as a countermeasure for the sound at a frequency that is unpleasant to the ear, you can lower the volume. Alternatively, is there a method using ultrasonic waves? There are disadvantages such as being easily affected.
本発明の目的は、」二連のような従来の欠点を払拭して
、小径の振動板であっても作動の安定性に優れ１１つ耳
障りな音の発しない小形のレベル検出器を、低価格に提
供することにある。The purpose of the present invention is to eliminate the disadvantages of the conventional dual-unit type level detector, and to provide a small level detector with excellent operational stability even with a small diameter diaphragm, and which does not emit harsh sound. The price is on offer.
（２） 発明の構成
本発明に係る小形振動式レベル検出器においては、振動
板の裏面に加振用圧電素子に交流電圧を印加して振動板
を共振振動させ、該振動板の表面に粉体、粒体、液体等
か接触することにより生じる振動振幅の変化を振動電圧
変換素子により電気信号に変換して粉体、粒体、液体等
のレベル変化を検出する振動式レベル検出器において、
振動板に重錘を附設して共振周波数を可変せしめるよう
構成したことを特徴としている。(2) Structure of the Invention In the small vibrating level detector according to the present invention, an alternating current voltage is applied to the excitation piezoelectric element on the back side of the diaphragm to cause the diaphragm to resonate, and powder is applied to the surface of the diaphragm. In a vibrating level detector that detects level changes in powders, granules, liquids, etc. by converting changes in vibration amplitude caused by contact with powders, granules, liquids, etc. into electrical signals using an oscillating voltage conversion element,
It is characterized by a configuration in which a weight is attached to the diaphragm to vary the resonance frequency.
以下実施例の図面について説明すると、１は振せられ、
裏面には圧電磁気板等の加振用圧電素子３が所定の配設
態様により貼着される。３′は振動電圧変換素子である
０、４は円柱状の重錘であって、環状フレーム２内にお
いて夫々振動板ｌ、加振用圧電素子３．振動電圧変換素
子３′と接続される。To explain the drawings of the embodiment below, 1 is shaken,
A vibrating piezoelectric element 3 such as a piezoelectric magnetic plate is attached to the back surface in a predetermined manner. 3' is a vibration voltage conversion element 0, 4 is a cylindrical weight, and inside the annular frame 2, a diaphragm 1, an excitation piezoelectric element 3. It is connected to the oscillating voltage conversion element 3'.
６は被検出物の供給される容器でろシ、本発明検出器の
使用時には振動板１０表面を容器６内へ向ケて、環状フ
レーム２のフランジ部２ｆが容器６の外壁面へ当接する
ように取付ける。Reference numeral 6 denotes a container in which the object to be detected is supplied, and when the detector of the present invention is used, the surface of the diaphragm 10 is directed into the container 6, and the flange portion 2f of the annular frame 2 is in contact with the outer wall surface of the container 6. Attach to.
容器６内には粉体、粒体、液体等の被検出物７が供給さ
れるが、加振用圧電素子８に交流電圧を印加して振動板
１を共振振動させると、該振動板１の表面に被検出物７
が接触することによシ振動振幅の変化が生じるので、こ
の振動振幅の変化を振動電圧変換素子８′によυ電気信
号に変換して容器１内における被検出物７のレベル変化
を検出するのであるが、振動板ｌの中心部には重錘４が
定着されているので、前記共振振動の周波数は低減せし
められることになる。この低減率は１重錘４の重量を加
減することによって任意の価に設定し得るのでおる。A detected object 7 such as powder, granules, or liquid is supplied into the container 6. When an AC voltage is applied to the excitation piezoelectric element 8 to cause the diaphragm 1 to resonate, the diaphragm 1 Object to be detected 7 on the surface of
Since a change in the vibration amplitude occurs due to the contact, this change in vibration amplitude is converted into an electric signal by the vibration voltage conversion element 8' to detect a change in the level of the object to be detected 7 in the container 1. However, since the weight 4 is fixed at the center of the diaphragm 1, the frequency of the resonance vibration is reduced. This reduction rate can be set to an arbitrary value by adjusting the weight of the single weight 4.
（３） 発明の効果
本発明検出器では、振動板ｌの中心部に共振周波数を低
くするための重錘４が附設せられているので、次のよう
な効果が派生する。(3) Effects of the Invention In the detector of the present invention, the weight 4 for lowering the resonance frequency is attached to the center of the diaphragm l, so that the following effects are derived.
第一に、低域周波数で加振させた場合、従来の振動板と
同等の駆動力で加振するよシも大きな振幅の振動が得ら
れる。従って、容器６内における被検出物７の上限検出
用として使用した場合に、振動板１の検出面の剛着物（
粉体や粘性液体）’ｔ−排除することが容易でおるとい
う利点がある。また、振動音の聴感に対する効果として
、８００Ｈｚ以下の周波数の音であれは、長時間でも成
る程度耐えられる程度に振動音が緩和されるという実験
結果が得られた。First, when vibrating at a low frequency, vibrations with a larger amplitude can be obtained than when vibrating with the same driving force as a conventional diaphragm. Therefore, when used for detecting the upper limit of the detected object 7 in the container 6, if there is a rigid object (
It has the advantage of being easy to remove (powders and viscous liquids). Furthermore, as an effect on the auditory sense of vibrational sound, an experimental result was obtained that the vibrational sound is alleviated to the extent that it can be endured for a long period of time if the sound has a frequency of 800 Hz or less.
第二に、共振周波数での駆動時には、従来よシも少ない
駆動力で効率の良い振動が得られ、粉体や液体を高感度
に検出し得るという利点がある。Second, when driven at the resonant frequency, efficient vibration can be obtained with less driving force than in the past, and powders and liquids can be detected with high sensitivity.
そして加振用圧電素子８として、ｆｆ電磁気板の加振力
の弱いものでも使用できるので、低コストに製造し得ら
れ、また、駆動電圧金低くできるので、維持費を低減せ
しめ得るという利点もある。As the piezoelectric element 8 for vibration, even a weak excitation force of the ff electromagnetic plate can be used, so it can be manufactured at low cost, and the drive voltage can be lowered, which has the advantage of reducing maintenance costs. be.
第１図は従来の振動式レベル検出器の縦断面図である。
第２図は本発明検出器の縦断面図、第８図は第２図のＡ
−Ａ線における横断面図でわる。
第４図の（Ａ）ＣＢ）（Ｃ）ＣＤ）は本発明検出器にお
ける振動板へのＭ錘の附設態様を例示した側面図、第５
図の（Ａ）ＣＢ）は本発明検出器における児振用圧電素
子と振動電圧変換素子との配設態様を例示した振動板の
裏面図でおる。第６図は本発明検出器の使用時の取付状
態を例示した縦断面図である。
■・−・振動板、３・・・加振用圧電素子、８′・・・
振動電圧変換素子、４・・・重錘。
第１図
第２図
第３図
第４図FIG. 1 is a longitudinal sectional view of a conventional vibrating level detector. Figure 2 is a longitudinal cross-sectional view of the detector of the present invention, and Figure 8 is A of Figure 2.
- Cross-sectional view taken along line A. (A) CB) (C) CD) of FIG.
(A) and (CB) in the figures are back views of the diaphragm illustrating the arrangement of the vibration piezoelectric element and the oscillating voltage conversion element in the detector of the present invention. FIG. 6 is a longitudinal cross-sectional view illustrating the mounting state of the detector of the present invention when in use. ■--Vibration plate, 3... Piezoelectric element for vibration, 8'...
Vibrating voltage conversion element, 4... weight. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
該加振用圧電素子（３）に交流電圧を印加して振動板（
＋１を共振振動させ、該振動板（１）の表面に粉体、抗
体、液体等が接触することにより生じる振動振幅の変化
を振動電圧変換素子により電気信号に変換して粉体、粒
体、液体等のレベル変化を検出する振動式レベル検出器
において、振動板（１）に重錘（４）を附設して共振周
波数を可変ぜしめるよう構成したことを特徴とする小形
振動式レベル検出器。A piezoelectric element (3) for vibration is fixed on the back side of the diaphragm (1),
An alternating current voltage is applied to the piezoelectric element (3) for vibration, and the diaphragm (
+1 is resonantly vibrated, and the change in vibration amplitude caused by contact of powder, antibody, liquid, etc. with the surface of the diaphragm (1) is converted into an electric signal by a vibration voltage conversion element, and the powder, granule, etc. A small vibrating level detector for detecting level changes in liquid, etc., characterized in that a weight (4) is attached to a vibrating plate (1) to make the resonance frequency variable. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11307083A JPS604820A (en) | 1983-06-23 | 1983-06-23 | Small sized vibration type level detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11307083A JPS604820A (en) | 1983-06-23 | 1983-06-23 | Small sized vibration type level detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS604820A true JPS604820A (en) | 1985-01-11 |
Family
ID=14602729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11307083A Pending JPS604820A (en) | 1983-06-23 | 1983-06-23 | Small sized vibration type level detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604820A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203059A (en) * | 1986-03-01 | 1987-09-07 | Shizuoka Seiki Co Ltd | Grain state detector of recirculation type grain dryer and grain state judge device utilizing said detector |
| US5035140A (en) * | 1988-11-03 | 1991-07-30 | The Boeing Company | Self cleaning liquid level detector |
| EP0599233A1 (en) * | 1992-11-26 | 1994-06-01 | Konica Corporation | Powder fluidity detecting apparatus |
| US5761955A (en) * | 1993-12-27 | 1998-06-09 | Simmonds Precision Products, Inc. | Removable ultrasonic transducer with integral electrical disconnect |
| US6729184B2 (en) | 2000-07-28 | 2004-05-04 | Seiko Epson Corporation | Detector of liquid consumption condition |
| US6745626B2 (en) | 1999-05-20 | 2004-06-08 | Seiko Epson Corporation | Liquid detecting piezoelectric device, liquid container and mounting module member |
| US6793305B2 (en) | 2000-05-18 | 2004-09-21 | Seiko Epson Corporation | Method and apparatus for detecting consumption of ink |
| WO2008053003A1 (en) * | 2006-10-31 | 2008-05-08 | Arcelik Anonim Sirketi | Detergent dispenser with agitator current determining fill level |
| US10811590B1 (en) | 2016-06-23 | 2020-10-20 | Plastipak Packaging, Inc. | Containers with sensing and/or communication features |
-
1983
- 1983-06-23 JP JP11307083A patent/JPS604820A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62203059A (en) * | 1986-03-01 | 1987-09-07 | Shizuoka Seiki Co Ltd | Grain state detector of recirculation type grain dryer and grain state judge device utilizing said detector |
| US5035140A (en) * | 1988-11-03 | 1991-07-30 | The Boeing Company | Self cleaning liquid level detector |
| EP0599233A1 (en) * | 1992-11-26 | 1994-06-01 | Konica Corporation | Powder fluidity detecting apparatus |
| US5438393A (en) * | 1992-11-26 | 1995-08-01 | Konica Corporation | Powder fluidity detecting apparatus which includes a piezoelectric element |
| US5761955A (en) * | 1993-12-27 | 1998-06-09 | Simmonds Precision Products, Inc. | Removable ultrasonic transducer with integral electrical disconnect |
| US6745626B2 (en) | 1999-05-20 | 2004-06-08 | Seiko Epson Corporation | Liquid detecting piezoelectric device, liquid container and mounting module member |
| US6799820B1 (en) | 1999-05-20 | 2004-10-05 | Seiko Epson Corporation | Liquid container having a liquid detecting device |
| US7267000B1 (en) * | 1999-05-20 | 2007-09-11 | Seiko Epson Corporation | Liquid consumption status detecting method, liquid container, and ink cartridge |
| US7383727B2 (en) * | 1999-05-20 | 2008-06-10 | Seiko Epson Corporation | Liquid cotainer having a liquid consumption detecting device therein |
| US7434462B2 (en) * | 1999-05-20 | 2008-10-14 | Seiko Epson Corporation | Liquid consumption status detecting method, liquid container, and ink cartridge |
| US6793305B2 (en) | 2000-05-18 | 2004-09-21 | Seiko Epson Corporation | Method and apparatus for detecting consumption of ink |
| US6729184B2 (en) | 2000-07-28 | 2004-05-04 | Seiko Epson Corporation | Detector of liquid consumption condition |
| WO2008053003A1 (en) * | 2006-10-31 | 2008-05-08 | Arcelik Anonim Sirketi | Detergent dispenser with agitator current determining fill level |
| US10811590B1 (en) | 2016-06-23 | 2020-10-20 | Plastipak Packaging, Inc. | Containers with sensing and/or communication features |
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