CN202424671U - Novel piezoelectric liquid level switch - Google Patents
Novel piezoelectric liquid level switch Download PDFInfo
- Publication number
- CN202424671U CN202424671U CN2012202480847U CN201220248084U CN202424671U CN 202424671 U CN202424671 U CN 202424671U CN 2012202480847 U CN2012202480847 U CN 2012202480847U CN 201220248084 U CN201220248084 U CN 201220248084U CN 202424671 U CN202424671 U CN 202424671U
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- China
- Prior art keywords
- level switch
- vibrating reed
- housing
- operational amplifier
- liquid
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a novel piezoelectric liquid level switch. The piezoelectric liquid level switch comprises a sensing part and a detecting part which are connected through a lead wire, wherein the sensing part comprises a shell with an opening at the lower end, a vibrating reed is arranged at the opening at the lower end of the shell, a piezoelectric ceramic piece is attached on the inner surface of the vibrating reed, and the detection part comprises an operational amplifier. Two semi-circular silver conducting layers are plated on the upper end surface of the piezoelectric ceramic piece, one silver conducting layer is connected with an inverted input end of the operational amplifier, and the other silver conducting layer is connected with an output end of the operational amplifier. The novel piezoelectric liquid level switch is provided with the sensing part and the detection part which are connected by the lead wire, and is suitable for wide medium range as the sensing part is smart in size, flexible in connection mode, strong in impact resistance, can not be affected by the density, the viscosity or electrical characteristics of liquid mediums, and can not be affected by dirt or eddy current as well.
Description
Technical field
The utility model relates to the level monitoring device technical field, is 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.
The utility model content
It is the piezoelectricity liquid-level switch of detecting element with the piezoelectric ceramic piece that the purpose of the utility model is to provide a kind of, this liquid-level switch novel structure, and good stability, reliability is high.
The utility model 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.
The beneficial effect of the utility model:
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 utility model 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 the restriction to the utility model; The utility model also be not limited in above-mentioned for example, variation, remodeling, interpolation or replacement that the technical staff in present technique field is made in the essential scope of the utility model also should belong to the protection range of the utility model.
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 |
|---|---|---|---|
| CN2012202480847U CN202424671U (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202480847U CN202424671U (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424671U true CN202424671U (en) | 2012-09-05 |
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ID=46749394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202480847U Expired - Fee Related CN202424671U (en) | 2012-05-30 | 2012-05-30 | Novel piezoelectric liquid level switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424671U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664613A (en) * | 2012-05-30 | 2012-09-12 | 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 CN2012202480847U patent/CN202424671U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664613A (en) * | 2012-05-30 | 2012-09-12 | 青岛澳波泰克安全设备有限责任公司 | Novel piezoelectric liquid level switch |
| CN102664613B (en) * | 2012-05-30 | 2014-12-24 | 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20150530 |
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| EXPY | Termination of patent right or utility model |