CN102664613A - Novel piezoelectric liquid level switch - Google Patents
Novel piezoelectric liquid level switch Download PDFInfo
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- CN102664613A CN102664613A CN2012101737020A CN201210173702A CN102664613A CN 102664613 A CN102664613 A CN 102664613A CN 2012101737020 A CN2012101737020 A CN 2012101737020A CN 201210173702 A CN201210173702 A CN 201210173702A CN 102664613 A CN102664613 A CN 102664613A
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- level switch
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- vibrating reed
- liquid
- novel piezoelectric
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Abstract
The invention discloses a novel piezoelectric liquid level switch which comprises a sensing part and a detection part connected through leads. The sensing part comprises a casing with an opening at the lower end, a vibrating reed is mounted at the opening of the casing, a piezoelectric ceramic piece is attached on the inner surface of the vibrating reed. The detection part comprises an operation amplifier. Two semicircular silver conductive layers are plated on the upper end face of the piezoelectric ceramic piece, one of the two semicircular silver conductive layers is connected with a back-phase input end of the operation amplifier, and the other one is connected with an output end of the operation amplifier. The novel piezoelectric liquid level switch comprises the sensing part and the detection part which are connected through the leads, the sensing part is small in size and flexible in connection mode. Further, the novel piezoelectric liquid lever switch is high in impact resistance and free of affection of density, viscosity and electric characteristics of liquid media and affection of pollutant and vortex, thereby being applicable to more media.
Description
Technical field
The present invention relates to the level monitoring device technical field, be specifically related to a kind of piezoelectricity liquid-level switch.
Background technology
Common liquid-level switch type has float-ball type, magnetic substance formula and photoelectric type at present, and is wherein comparatively extensive with float-ball type liquid-level switch, magnetic substance formula liquid-level switch and photoelectric liquid-levle switch application.The float-ball type liquid-level switch is to utilize ball float to move up and down with water level height, makes the contact open closed and reaches the purpose of automatic control.But should control its complex structure, and need parts such as major axis and installing rack, and be difficult for installing, volume is bigger, and the liquid level control range is fixed, and stability is poor slightly.Magnetic substance formula liquid-level switch utilizes buoyancy and magnetostatic field principle design to produce; The position of ball float in measured medium that has magnet influenced by buoyancy; The variation of liquid level causes the variation of magnetic float position, and the variation of magnetic float position causes the variation of electrical quantities, thereby detects liquid level.But the mechanism of this liquid-level switch is complicated, and volume is big, and the control liquid level can not be regulated, and installs complicated.The photoelectric liquid-levle switch is to utilize the photoelectric effect principle, when liquid level immersion liquid bit switch, triggers its photo-sensitive cell, thus the detecting liquid level, but the prism of this liquid-level switch is fragile, and under environment such as oil gas, steam easy false alarm, it is unreliable to work.
Summary of the invention
The object of the present invention is to provide a kind of is the piezoelectricity liquid-level switch of detecting element with the piezoelectric ceramic piece, this liquid-level switch novel structure, and good stability, reliability is high.
The present invention to achieve these goals, the technical solution of employing is:
The novel piezoelectric liquid-level switch comprises the sensing element and the detection part that are linked together by lead, and said sensing element comprises the housing of lower ending opening, and vibrating reed is equipped with at housing lower ending opening place, and the inner surface of vibrating reed posts piezoelectric ceramic piece; Said detection part comprises operational amplifier, and the upper surface of piezoelectric ceramic piece is coated with two semicircular silver conductive layers, and a silver conductive layer is connected with the inverting input of operational amplifier, and another silver conductive layer is connected with the output of operational amplifier.
Preferably, said vibrating reed bottom is the plane, is surrounded with stile around the bottom, and there is horizontal flange laterally the stile upper end, and flange and housing join.
Preferably, said housing is cylindrical, and there is inside step surface the housing lower end, and the outline of vibrating reed bottom and flange is all rounded, and vibrating reed is pressed in flange on the step surface through the ring that is enclosed within on the stile.
Preferably, the opening that is higher than the housing lower end bottom the said vibrating reed.
Preferably, said housing, vibrating reed, ring are processed by stainless steel material.
Preferably, said housing upper surface has through wires hole, and lead is one three heart yearn, and article one heart yearn is connected with housing, and the second heart yearn is connected respectively through two the semicircular silver conductive layers of through wires hole with the inner surface of vibrating reed with the 3rd heart yearn.
Preferably, said article one heart yearn is connected with housing through screw.
Preferably, said operational amplifier employing model is the dual operational amplifier of LM258.
Beneficial effect of the present invention:
This kind novel piezoelectric liquid-level switch has sensing element and detection part two parts, and two parts connect through lead, the sensing element advantages of small volume, and connected mode is flexible, applied range.Vibrating reed is pressed in flange on the step surface of housing through the ring that is enclosed within on the stile, and vibrating reed is closely contacted with housing, has guaranteed the conduction that both are good.
The vibrating reed bottom is higher than the opening of housing lower end, when the liquid-level switch vibrating reed is installed and used, prevents that effectively liquid level from rising to this position and forming the extruding bubble down, the precision of Interference Detection, and visible this piezoelectricity liquid-level switch accuracy of detection and sensitivity are all higher.And this kind piezoelectricity liquid-level switch can also be erect and install and use, and vibrating reed is upright state, and installation and occupation mode are various.
Housing, vibrating reed, ring are processed by stainless steel material, and be shock-resistant, and the not influence of liquid body density of medium, viscosity and electrical characteristics does not receive the influence of dirt, eddy current, and piezoelectricity liquid-level switch Applicable media is extensive.
Description of drawings
Fig. 1 is the structural representation of novel piezoelectric liquid-level switch.
Fig. 2 is the exploded view of sensing element.
Fig. 3 is piezoelectric ceramic piece and vibrating reed structure combining sketch map.
Fig. 4 is the circuit theory diagrams of novel piezoelectric liquid-level switch.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated:
In conjunction with Fig. 1 to Fig. 4, the novel piezoelectric liquid-level switch comprises the sensing element 1 and detection part 2 that are linked together by lead.Said sensing element 1 comprises housing 11, the vibrating reed 12 of lower ending opening, and said housing 11 is cylindrical, and there is inside step surface 13 housing 11 lower ends; Vibrating reed 12 bottoms are circular flat, are surrounded with stile 121 around the bottom, and there is horizontal flange 122 laterally stile 121 upper ends; Flange 122 contacts with housing 11; Vibrating reed 12 is pressed in flange 122 on the step surface 13 through the ring 14 that is enclosed within on the stile 121, and vibrating reed 12 bottoms are higher than the opening of housing lower end, and the inner surface of vibrating reed 12 posts piezoelectric ceramic piece 32; The upper surface of piezoelectric ceramic piece 32 is coated with two semicircular silver conductive layer 31, two silver conductive layers 31 adjacent rows and is listed on the piezoelectric ceramic piece 32.Said detection part 2 comprises operational amplifier, and a silver conductive layer 31 is connected with the inverting input of operational amplifier, and another silver conductive layer 31 is connected with the output of operational amplifier, and the lower surface of piezoelectric ceramic piece 32 is through vibrating reed 12 ground connection.
More preferably: housing 11, vibrating reed 12, ring 14 are processed by stainless steel material; Housing 11 upper surfaces have through wires hole 15; Lead has three heart yearns; Article one, heart yearn is connected with housing 11 through screw 16, and second heart yearn 17 is connected respectively through two the semicircular silver conductive layers 31 of through wires hole 15 with the inner surface of vibrating reed 12 with the 3rd heart yearn 18.
This kind novel piezoelectric liquid-level switch has sensing element and detection part two parts, and two parts connect through lead, the sensing element advantages of small volume, and connected mode is flexible, applied range.Vibrating reed is pressed in flange on the step surface of housing through the ring that is enclosed within on the stile, and vibrating reed is closely contacted with housing, has guaranteed conduction and sealing that both are good.
The vibrating reed bottom is higher than the opening of housing lower end, when the liquid-level switch vibrating reed is installed and used, prevents that effectively liquid level from rising to this position and forming the extruding bubble down, the precision of Interference Detection, and visible this piezoelectricity liquid-level switch accuracy of detection and sensitivity are all higher.And this kind piezoelectricity liquid-level switch can also be erect and install and use, and vibrating reed is upright state, and installation and occupation mode are various.
Housing, vibrating reed, ring are processed by stainless steel material, and be shock-resistant, and the not influence of liquid body density of medium, viscosity and electrical characteristics does not receive the influence of dirt, eddy current, and piezoelectricity liquid-level switch Applicable media is extensive.
Certainly, above-mentioned explanation is not to be limitation of the present invention, and the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that the technical staff in present technique field is made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (8)
1. novel piezoelectric liquid-level switch, it is characterized in that: comprise the sensing element and the detection part that are linked together by lead, said sensing element comprises the housing of lower ending opening, and vibrating reed is equipped with at housing lower ending opening place, and the inner surface of vibrating reed posts piezoelectric ceramic piece; Said detection part comprises operational amplifier, and the upper surface of piezoelectric ceramic piece is coated with two semicircular silver conductive layers, and a silver conductive layer is connected with the inverting input of operational amplifier, and another silver conductive layer is connected with the output of operational amplifier.
2. novel piezoelectric liquid-level switch according to claim 1 is characterized in that: said vibrating reed bottom is the plane, is surrounded with stile around the bottom, and there is horizontal flange laterally the stile upper end, and flange and housing join.
3. novel piezoelectric liquid-level switch according to claim 2; It is characterized in that: said housing is cylindrical; There is inside step surface the housing lower end, and the outline of vibrating reed bottom and flange is all rounded, and vibrating reed is pressed in flange on the step surface through the ring that is enclosed within on the stile.
4. novel piezoelectric liquid-level switch according to claim 3 is characterized in that: said vibrating reed bottom is higher than the opening of housing lower end.
5. novel piezoelectric liquid-level switch according to claim 4 is characterized in that: said housing, vibrating reed, ring are processed by stainless steel material.
6. according to each described novel piezoelectric liquid-level switch of claim 1 to 5; It is characterized in that: said housing upper surface has through wires hole; Lead is one three heart yearn; Article one, heart yearn is connected with housing, and the second heart yearn is connected respectively through two the semicircular silver conductive layers of through wires hole with the inner surface of vibrating reed with the 3rd heart yearn.
7. novel piezoelectric liquid-level switch according to claim 6 is characterized in that: said article one heart yearn is connected with housing through screw.
8. novel piezoelectric liquid-level switch according to claim 7 is characterized in that: it is the dual operational amplifier of LM258 that said operational amplifier adopts model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210173702.0A CN102664613B (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210173702.0A CN102664613B (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
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| Publication Number | Publication Date |
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| CN102664613A true CN102664613A (en) | 2012-09-12 |
| CN102664613B CN102664613B (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210173702.0A Active CN102664613B (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2529451Y (en) * | 2002-01-17 | 2003-01-01 | 青岛经济技术开发区澳波泰克安全设备厂 | Piezoelectric liquid level switch |
| CN2849667Y (en) * | 2005-12-12 | 2006-12-20 | 杭州术通高端仪器有限公司 | Plane type multi-sensitive face flow sensor |
| US20090086457A1 (en) * | 2007-09-26 | 2009-04-02 | Sanyo Electric Co., Ltd. | Hybrid integrated circuit device |
| CN202424671U (en) * | 2012-05-30 | 2012-09-05 | 青岛澳波泰克安全设备有限责任公司 | Novel piezoelectric liquid level switch |
-
2012
- 2012-05-30 CN CN201210173702.0A patent/CN102664613B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2529451Y (en) * | 2002-01-17 | 2003-01-01 | 青岛经济技术开发区澳波泰克安全设备厂 | Piezoelectric liquid level switch |
| CN2849667Y (en) * | 2005-12-12 | 2006-12-20 | 杭州术通高端仪器有限公司 | Plane type multi-sensitive face flow sensor |
| US20090086457A1 (en) * | 2007-09-26 | 2009-04-02 | Sanyo Electric Co., Ltd. | Hybrid integrated circuit device |
| CN202424671U (en) * | 2012-05-30 | 2012-09-05 | 青岛澳波泰克安全设备有限责任公司 | Novel piezoelectric liquid level switch |
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| CN102664613B (en) | 2014-12-24 |
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