CN204439147U - A kind of high sensitivity water meter flow sensor - Google Patents
A kind of high sensitivity water meter flow sensor Download PDFInfo
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- CN204439147U CN204439147U CN201520019568.8U CN201520019568U CN204439147U CN 204439147 U CN204439147 U CN 204439147U CN 201520019568 U CN201520019568 U CN 201520019568U CN 204439147 U CN204439147 U CN 204439147U
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- piezoelectric ceramics
- shell
- dividing plate
- high sensitivity
- water meter
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Abstract
The utility model discloses a kind of high sensitivity water meter flow sensor, the piezoelectric ceramics comprising shell and be provided with in the enclosure, piezoelectric ceramics is connected with signal wire, matching layer is provided with between piezoelectric ceramics and shell, dividing plate is provided with above piezoelectric ceramics another side, a cavity is formed between dividing plate and piezoelectric ceramics, filling agent is filled in the cavity that dividing plate one side outwardly and shell are formed, piezoelectric ceramics is through hyperpolarization process, pass through piezoelectric ceramics, the cooperation of acoustic impedance between matching layer and shell three kinds of materials, ultrasound wave can effectively be passed, reach required sensitivity, the utility model is applicable to sensor field.
Description
Technical field
The utility model relates to sensor field, particularly relates to a kind of high sensitivity water meter flow sensor.
Background technology
Ultrasonic water meter has that measuring accuracy is high, the advantage of working stability.Not by the impact of impurities in water, long service life.There is outstanding low discharge detectability, the problem that numerous conventional water meter produces can be solved, be more applicable to the charge of water rate gradient, be more applicable to saving and the Appropriate application of water resource, there is wide market and prospect of the application.
But at present in watermeter flowing rate meter field, ultrasonic water meter does less and less, causes amplitude weak, make to launch ultrasonic intensity weak, what bring is sensitivity decrease thereupon, and value error is larger.
Utility model content
For solving the problem, the utility model provides a kind of high sensitivity ultrasonic sensor met under little assembling external diameter.
The utility model solves the technical scheme that its technical matters adopts:
A kind of high sensitivity water meter flow sensor, the piezoelectric ceramics comprising shell and be provided with in the enclosure, piezoelectric ceramics is connected with signal wire, matching layer is provided with between piezoelectric ceramics and shell, be provided with dividing plate above piezoelectric ceramics another side, between dividing plate and piezoelectric ceramics, form a cavity, in the cavity that dividing plate one side outwardly and shell are formed, fill filling agent, piezoelectric ceramics is through hyperpolarization process, and the acoustic impedance of piezoelectric ceramics is 2.7 × 10
6kg/M
2/ S ~ 3.1 × 10
6kg/M
2/ S, the intermediate transfer layer acoustic impedance formed between matching layer and shell is 1.5 × 10
6kg/M
2/ S ~ 6.0 × 10
6kg/M
2/ S.
Be further used as the improvement of technical solutions of the utility model, dividing plate is provided with through hole, and signal wire is connected on piezoelectric ceramics through described through hole.
Be further used as the improvement of technical solutions of the utility model, matching layer thickness is 0.50mm ~ 1.50mm.
Be further used as the improvement of technical solutions of the utility model, the outside dimension of shell is 2mm ~ 40mm.
The beneficial effects of the utility model: the acoustic impedance of this high sensitivity ultrasonic sensor optimal design-aside piezoelectric ceramics and the intermediate transfer layer acoustic impedance formed between matching layer and shell, make cooperatively interacting of acoustic impedance between piezoelectric ceramics, matching layer and shell three kinds of materials, enhance hyperacoustic amplitude and emissive porwer, effectively improve the transmission efficiency of sensor under little assembling external diameter, decrease propagated error, significantly improve the sensitivity of sensor.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Fig. 1 is the utility model embodiment one-piece construction schematic diagram;
Fig. 2 is the utility model embodiment signal waveforms.
Embodiment
Be clearly and completely described below with reference to embodiment and the accompanying drawing technique effect to design of the present utility model, concrete structure and generation, to understand the purpose of this utility model, characteristic sum effect fully.Obviously; described embodiment is a part of embodiment of the present utility model, instead of whole embodiment, based on embodiment of the present utility model; other embodiments that those skilled in the art obtains under the prerequisite not paying creative work, all belong to the scope of the utility model protection.
With reference to Fig. 1, Fig. 2, the utility model is a kind of high sensitivity water meter flow sensor, the piezoelectric ceramics 2 comprising shell 1 and be provided with in shell 1, piezoelectric ceramics 2 is connected with signal wire 6, matching layer 5 is provided with between piezoelectric ceramics 2 and shell 1, dividing plate 3 is provided with above piezoelectric ceramics 2 another side, a cavity is formed between dividing plate 3 and piezoelectric ceramics 2, filling agent 4 is filled in the cavity that dividing plate 3 one side outwardly and shell 1 are formed, piezoelectric ceramics 2 is through hyperpolarization process, and the acoustic impedance of piezoelectric ceramics 2 is 2.7 × 10
6kg/M
2/ S ~ 3.1 × 10
6kg/M
2/ S, the intermediate transfer layer acoustic impedance formed between matching layer 5 and shell 1 is 1.5 × 10
6kg/M
2/ S ~ 6.0 × 10
6kg/M
2/ S.
The acoustic impedance of this high sensitivity ultrasonic sensor optimal design-aside piezoelectric ceramics 2 and the intermediate transfer layer acoustic impedance formed between matching layer 5 and shell 1, make cooperatively interacting of acoustic impedance between piezoelectric ceramics 2, matching layer 5 and shell 1 three kinds of materials, enhance hyperacoustic amplitude and emissive porwer, effectively improve the transmission efficiency of sensor under little assembling external diameter, decrease propagated error, significantly improve the sensitivity of sensor.
As the utility model preferred embodiment, dividing plate 3 is provided with through hole, and signal wire 6 is connected on piezoelectric ceramics 2 through described through hole.
As the utility model preferred embodiment, matching layer 5 thickness is 0.50mm ~ 1.50mm.
As the utility model preferred embodiment, the outside dimension of shell 1 is 2mm ~ 40mm.
Through the piezoelectric ceramics 2 of hyperpolarization process, if add a voltage on it, so piezoelectric ceramics 2 can produce a deformation, piezoelectric effect can be produced simultaneously, launch sound wave, because ultrasound wave is delivered in easy reflection supersonic wave in the different boundary surface of acoustic impedance, the ultrasonic intensity through border is reduced; To successively decrease formula according to ultrasound wave transmission:
; Wherein the acoustic impedance of water is 1.48 × 10
6kg/M
2/ S, piezoelectric ceramics 2 acoustic impedance is: 2.9 × 10
6kg/M
2/ S.
According to calculating, intermediate transfer layer acoustic impedance should be 2.07 × 10
6kg/M
2/ S, scope is 1.5 × 10
6kg/M
2/ S ~ 6.0 × 10
6kg/M
2between/S.
According to formula λ=v/f, 1 MHz ultrasound wave wavelength is 0.00148m, i.e. 1.48mm.Wavelength signals at 1/4 and 3/4 place is the strongest at the signal of critical surface, and be in interphase ultrasound wave loss minimum principle according to 1/4 wavelength place and 3/4 wavelength, calculating matching layer 5 thickness is 1.10mm.
The visual matching requirements definition of physical dimension, the external diameter of current shell 1 used has 8mm, 9.5mm, 12mm, 13mm, 15mm, 16.8mm, 18mm.
Certainly, the invention is not limited to above-mentioned embodiment, those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite without prejudice to the utility model spirit, and these equivalent modification or replacement are all included in the application's claim limited range.
Claims (4)
1. a high sensitivity water meter flow sensor, it is characterized in that: the piezoelectric ceramics (2) comprising shell (1) and be provided with in described shell (1), described piezoelectric ceramics (2) is connected with signal wire (6), matching layer (5) is provided with between described piezoelectric ceramics (2) and shell (1), dividing plate (3) is provided with above described piezoelectric ceramics (2) another side, a cavity is formed between described dividing plate (3) and piezoelectric ceramics (2), filling agent (4) is filled in the cavity that described dividing plate (3) one side outwardly and shell (1) are formed, described piezoelectric ceramics (2) is through hyperpolarization process, the acoustic impedance of described piezoelectric ceramics (2) is 2.7 × 10
6kg/M
2/ S ~ 3.1 × 10
6kg/M
2/ S, the intermediate transfer layer acoustic impedance formed between described matching layer (5) and shell (1) is 1.5 × 10
6kg/M
2/ S ~ 6.0 × 10
6kg/M
2/ S.
2. high sensitivity water meter flow sensor according to claim 1, it is characterized in that: described dividing plate (3) is provided with through hole, described signal wire (6) is connected on piezoelectric ceramics (2) through described through hole.
3. high sensitivity water meter flow sensor according to claim 1 or 2, is characterized in that: the thickness of matching layer (5) is 0.50mm ~ 1.50mm.
4. high sensitivity water meter flow sensor according to claim 3, is characterized in that: the outside dimension of described shell (1) is 2mm ~ 40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520019568.8U CN204439147U (en) | 2015-01-12 | 2015-01-12 | A kind of high sensitivity water meter flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520019568.8U CN204439147U (en) | 2015-01-12 | 2015-01-12 | A kind of high sensitivity water meter flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204439147U true CN204439147U (en) | 2015-07-01 |
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|---|---|---|---|
| CN201520019568.8U Active CN204439147U (en) | 2015-01-12 | 2015-01-12 | A kind of high sensitivity water meter flow sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990924A (en) * | 2017-12-07 | 2018-05-04 | 广东奥迪威传感科技股份有限公司 | A kind of ultrasonic sensor |
-
2015
- 2015-01-12 CN CN201520019568.8U patent/CN204439147U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107990924A (en) * | 2017-12-07 | 2018-05-04 | 广东奥迪威传感科技股份有限公司 | A kind of ultrasonic sensor |
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| GR01 | Patent grant |