JPS6145455Y2 - - Google Patents
Info
- Publication number
- JPS6145455Y2 JPS6145455Y2 JP7111281U JP7111281U JPS6145455Y2 JP S6145455 Y2 JPS6145455 Y2 JP S6145455Y2 JP 7111281 U JP7111281 U JP 7111281U JP 7111281 U JP7111281 U JP 7111281U JP S6145455 Y2 JPS6145455 Y2 JP S6145455Y2
- Authority
- JP
- Japan
- Prior art keywords
- vibrator
- case
- vibrating piece
- substance
- detected
- 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
- 239000002184 metal Substances 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 description 12
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Description
【考案の詳細な説明】
本考案は小形で検知精度の高い圧電式レベル検
知器を提供しようとするものである。[Detailed Description of the Invention] The present invention aims to provide a piezoelectric level detector that is small and has high detection accuracy.
従来のこの種の圧電式レベル検知器としては第
１図、第２図に示すように構成されていた。 Conventional piezoelectric level detectors of this type have been constructed as shown in FIGS. 1 and 2.
すなわち、幅が一定の矩形状の金属振動片１の
中央部に圧電磁器板２を貼付けて振動子３とし、
この振動子３の金属振動片１の両端からl0の位置
のＡ−Ａ，Ｂ−Ｂで示し節部を弾性的に支持して
構成されていた。 That is, a piezoelectric ceramic plate 2 is attached to the center of a rectangular metal vibrating piece 1 with a constant width to form a vibrator 3.
This vibrator 3 was constructed by elastically supporting the node portions indicated by A-A and B-B at positions l0 from both ends of the metal vibrating piece 1.
この構成での振動子３の一端の振幅はd0となり
小さく、この一端に少量の物質が付着したときに
も振動が抑制されて被検知物質のレベルが低下し
ているにもかかわらず、出力電圧が大きくならな
いといつた誤検知を生じる欠点があつた。 In this configuration, the amplitude at one end of the vibrator 3 is d 0 , which is small, and even when a small amount of substance adheres to this one end, the vibration is suppressed and the level of the detected substance is reduced, but the output is There was a drawback that false detections could occur unless the voltage became large.
本考案は以上のような従来の欠点を除去するも
のである。 The present invention eliminates the above-mentioned drawbacks of the prior art.
以下、本考案の実施例を図面第３図〜第６図に
より説明する。 Embodiments of the present invention will be described below with reference to FIGS. 3 to 6.
まず、第３図、第４図において、４は振動子
で、この振動子４は一端に幅の狭い部分を設けた
矩形状の金属振動片５の中央部に圧電磁器板６を
貼付け、金属振動片５の他端に付加質通７を結合
して構成されている。この振動子４は振動の節部
でケース８にシリコンゴムなどの弾性体９を介し
て弾性的に保持されており、幅の狭い金属振動片
５の一端はケース８の外方に突出している。 First, in FIGS. 3 and 4, 4 is a vibrator, and this vibrator 4 is a rectangular metal vibrating piece 5 with a narrow part at one end, and a piezoelectric ceramic plate 6 is attached to the center of the metal vibrating piece 5. It is constructed by connecting an additional mass throughput 7 to the other end of the vibrating piece 5. This vibrator 4 is elastically held by a case 8 at a vibration node via an elastic body 9 such as silicone rubber, and one end of a narrow metal vibrating piece 5 protrudes outside of the case 8. .
また、上記振動子４の圧電磁器板６の表面には
電極１０，１１が設けられ、この電極１０，１１
はリード線１２，１３でケース８に設けた端子１
４，１５に接続され、この端子１４，１５には外
部リード線１６，１７が接続されている。また、
圧電磁器板６の裏面電極は金属振動片５に接続さ
れたリード線１８およびケース８に設けた端子１
９を介して外部リード線１６，１７のシールド線
２０に接続されている。 Furthermore, electrodes 10 and 11 are provided on the surface of the piezoelectric ceramic plate 6 of the vibrator 4.
is the terminal 1 provided in the case 8 with the lead wires 12 and 13.
4 and 15, and external lead wires 16 and 17 are connected to these terminals 14 and 15. Also,
The back electrode of the piezoelectric ceramic plate 6 is connected to a lead wire 18 connected to the metal vibrating piece 5 and a terminal 1 provided on the case 8.
9 to the shield wire 20 of the external lead wires 16 and 17.
この構成のものの振動子４を模式的に示したも
のが第５図，第６図であり、幅の狭い部分側の端
から振動の節部A′−A′までの寸法をl1、付加質量
７を結合した側の端から振動の節部B′−B′までの
寸法をl2とすると、従来例のl0との関係はl1＞l0＞
l2となる。したがつて、振動子４の全長が従来と
同じ場合、本考案の振動子４はケース８内部に収
納される寸法は従来より短かく、またケース８よ
り外部に突出する寸法l1は従来寸法l0より長くで
きる。さらに、突出部先端の振幅d1は従来の振幅
d0より大きくできる。 Figures 5 and 6 schematically show the vibrator 4 with this configuration, and the dimension from the narrow end to the vibration node A'-A' is l 1 , and If the dimension from the end of the side where mass 7 is connected to the vibration node B'-B' is l 2 , the relationship with l 0 of the conventional example is l 1 > l 0 >
l becomes 2 . Therefore, when the total length of the vibrator 4 is the same as that of the conventional one, the dimension of the vibrator 4 of the present invention that is housed inside the case 8 is shorter than that of the conventional one, and the dimension l1 that protrudes outside of the case 8 is the conventional size. l Can be longer than 0 . Furthermore, the amplitude d 1 at the tip of the protrusion is the same as the conventional amplitude
d can be greater than 0 .
このような圧電式レベル検知器は、容器中の液
体、粉体、粒体などの被検知物質のレベルを検知
するものであり、容器中に金属振動片５の一端を
下方に向けて配置されるとともに付加リード線１
６より入力信号が加えられて振動子４は励振され
る。容器中の被検知物質の量が少なく上面のレベ
ルが金属振動片５の一端より下方にあるときは振
動子４の振幅は大きく、外部リード線１７より大
電圧の電気出力が得られる。被検知物質の量が多
く、金属振動片５の一端が被検知物質中にあると
きは振動子４の振動が抑制されて振幅は小さく、
ほとんど電気出力は得られない。 Such a piezoelectric level detector detects the level of a substance to be detected such as liquid, powder, or granules in a container, and is arranged in a container with one end of a metal vibrating piece 5 facing downward. and additional lead wire 1.
An input signal is applied from 6, and the vibrator 4 is excited. When the amount of the substance to be detected in the container is small and the level of the upper surface is below one end of the metal vibrating piece 5, the amplitude of the vibrator 4 is large and an electrical output of a large voltage can be obtained from the external lead wire 17. When the amount of the substance to be detected is large and one end of the metal vibrating piece 5 is in the substance to be detected, the vibration of the vibrator 4 is suppressed and the amplitude is small.
Almost no electrical output is obtained.
したがつて出力電圧の大小により被検知物質が
所定のレベルまで増減したことが検知できる。 Therefore, it is possible to detect whether the amount of the substance to be detected has increased or decreased to a predetermined level based on the magnitude of the output voltage.
以上のように本考案の圧電式レベル検知器は構
成されており、振動子のケース内に収納される寸
法が短かいためにケース全長を短かくでき、小形
化が図れる。また、振動子のケース外に突出する
部分の長さが長く端部の振幅が大きいので、被検
知物質による先端部の制動効果が大きくできる。
特に、被検知物質が微粉体で質量が軽く、かつ粘
性の少ない物質の場合にも、被検知物質レベルが
振動子先端に達し、少量が先端に触れているだけ
の状態でも確実に振動子の振動が抑制される。一
方、被検知物質レベルが振動片先端より下方にあ
る場合は先端部に少量の物質が付着していても先
端部の振幅が大きいため払い落されてしまい、確
実に大振幅が得られる。したがつて、誤検知を生
じるといつたこともなくなり、検知精度の高いも
のとすることができ、小形化の効果と相俟つて実
用的価値の大なるものである。 The piezoelectric level detector of the present invention is constructed as described above, and since the size of the vibrator to be housed in the case is short, the overall length of the case can be shortened and the device can be made smaller. Further, since the length of the portion of the vibrator that protrudes outside the case is long and the amplitude at the end portion is large, the damping effect of the tip portion by the substance to be detected can be increased.
In particular, even when the substance to be detected is a fine powder, light in mass, and low in viscosity, the level of the substance to be detected reaches the tip of the transducer, and even if only a small amount is touching the tip, the transducer can be detected reliably. Vibration is suppressed. On the other hand, when the level of the substance to be detected is below the tip of the vibrating element, even if a small amount of substance is attached to the tip, the amplitude of the tip is large, so it is brushed off, and a large amplitude can be reliably obtained. Therefore, there is no possibility of false positive detection, and high detection accuracy can be achieved, which, together with the effect of miniaturization, has great practical value.
第１図は従来の圧電式レベル検知器を示す概略
構成図、第２図は同動作説明図、第３図は本考案
の圧電式レベル検知器の一実施例を示す断面上面
図、第４図は同断面正面図、第５図は同概略構成
図、第６図は同動作説明図である。
４…振動子、５…金属振動片、６…圧電磁器
板、７…付加質量、８…ケース、９…弾性体、１
０，１１…電極、１２，１３…リード線、１４，
１５…端子、１６，１７…外部リード線、１８…
リード線、１９…端子、２０…シールド線。
Fig. 1 is a schematic configuration diagram showing a conventional piezoelectric level detector, Fig. 2 is an explanatory diagram of the same operation, Fig. 3 is a sectional top view showing an embodiment of the piezoelectric level detector of the present invention, and Fig. 4 The figure is a sectional front view of the same, FIG. 5 is a schematic configuration diagram of the same, and FIG. 6 is an explanatory diagram of the same operation. 4... Vibrator, 5... Metal vibrating piece, 6... Piezoelectric ceramic plate, 7... Additional mass, 8... Case, 9... Elastic body, 1
0,11...electrode, 12,13...lead wire, 14,
15...Terminal, 16, 17...External lead wire, 18...
Lead wire, 19... terminal, 20... shield wire.
Claims (1)
る振動子を、振動の節部を弾性体を介してケース
に支持させるとともに、このケースより上記振動
子の一端を突出させ、かつ上記振動子の金属振動
片としてケースより突出する側を幅狭で長く突出
する構成とし、他端に付加質量を取付けて構成し
てなる圧電式レベル検知器。 A vibrator made of a metal vibrating piece with a piezoelectric ceramic plate attached to the center is supported by a case through an elastic body at its vibrating node, and one end of the vibrator is made to protrude from the case. A piezoelectric level detector consisting of a metal vibrating piece with the side protruding from the case narrow and long, and an additional mass attached to the other end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7111281U JPS6145455Y2 (en) | 1981-05-15 | 1981-05-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7111281U JPS6145455Y2 (en) | 1981-05-15 | 1981-05-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57183523U JPS57183523U (en) | 1982-11-20 |
| JPS6145455Y2 true JPS6145455Y2 (en) | 1986-12-20 |
Family
ID=29866910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7111281U Expired JPS6145455Y2 (en) | 1981-05-15 | 1981-05-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6145455Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3619678A1 (en) * | 1986-06-11 | 1987-12-17 | Eberhard Hermann | LEVEL CONTROL UNIT |
-
1981
- 1981-05-15 JP JP7111281U patent/JPS6145455Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57183523U (en) | 1982-11-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4720682A (en) | Surface electric potential sensor | |
| JPS5748617A (en) | Level detector for finely divided particles | |
| JPS6145455Y2 (en) | ||
| US3501654A (en) | Miniature pressure transducer | |
| KR860001346A (en) | Electric moisture measuring device | |
| JPH0236188B2 (en) | ||
| JP2000258260A5 (en) | ||
| JPS6120503Y2 (en) | ||
| JPS5924976Y2 (en) | level detector | |
| JPS59187227A (en) | Level detector | |
| JPS6242334Y2 (en) | ||
| JPS595914Y2 (en) | Piezoelectric buzzer with piezoelectric switch | |
| JPS6217744Y2 (en) | ||
| JPS59210323A (en) | Level detector | |
| JPS643089Y2 (en) | ||
| JPH0145873B2 (en) | ||
| JPS58213259A (en) | Detecting apparatus of surface electric potential | |
| JPS5924975Y2 (en) | Piezoelectric remaining amount detection device | |
| JPS59147256A (en) | Piezoelectric sensor | |
| JPH0156367B2 (en) | ||
| JPS60179664A (en) | Production for surface potential sensor element | |
| JPS6145454Y2 (en) | ||
| JPS61129583A (en) | Manufacture of surface potential sensor element | |
| JPS6145944A (en) | Load detecting device | |
| JPS61185000A (en) | Ultrasonic ceramic microphone |