CN1096099A - A kind of anticorrosive ultrasonic transducer - Google Patents
A kind of anticorrosive ultrasonic transducer Download PDFInfo
- Publication number
- CN1096099A CN1096099A CN 93111199 CN93111199A CN1096099A CN 1096099 A CN1096099 A CN 1096099A CN 93111199 CN93111199 CN 93111199 CN 93111199 A CN93111199 A CN 93111199A CN 1096099 A CN1096099 A CN 1096099A
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- ultrasonic transducer
- radiant panel
- transducing
- transducer according
- housing
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Abstract
A kind of ultrasonic transducer that is used for commercial measurement corrosive liquids liquid level, its structure adopts totally-enclosed mode.By being sealed in the piezoelectric chip in the plastic casing and having the single resistant material of certain rigidity such as plastics, epoxy resin, pottery etc. are made one, constitute the transducing radiant panel.The present invention adopts simple frame mode, obtained very high conversion efficiency, very little blind area and good directive property compare with existing various known anti-corrosion type transducers, can improve detection sensitivity more than tens times, be a kind of ultrasonic transducer that is applicable to reflection telemetry measuring liquid level.
Description
The invention discloses a kind of anticorrosive ultrasonic transducer, relate to a kind of industry range finding specifically and use ultrasonic transducer, particularly relate to the employed ultrasonic transducer of ultrasonic level gage that utilizes the ultrasonic reflection principle to measure the corrosive liquids liquid level.
In the existing background technology, known range finding ultrasonic transducer, generally adopt following several mode:
1. piezoelectric crystal direct radiation type: by the piezoelectric chip direct radiation ultrasound wave of planar shaped or wine cup shape, wherein planar shaped also need add hydraucone ultrasound wave is focused on, make it have directive property preferably, because piezoelectric chip directly contacts with air, so in humidity or contain in the environment of corrosive gas and can not use.
2. metal-closed: as to drive metal transducing radiant panel emission ultrasound wave by the piezoelectric chip that is encapsulated in the metal shell,, in containing severe corrosive acid mist gaseous environment, can not use because transducing radiant panel material mostly is copper or stainless steel.
3. anticorrosion enclosed type: with metal-closed structural similarity, difference is to be coated with the anticorrosive coat that special plastic or rubber are made on the transducing radiant panel.As with cylindrical shape piezoelectric crystal radial emission ultrasound wave, also need ultrasound wave to be focused on a larger-size funnel-form reverberator of making by resistant material, make it have directive property preferably.
Above-mentioned known 1,2 two kind of ultrasonic transducer because of the not corrosion of corrosion resistance gas, can not use when measuring the soda acid liquid level.Disclosed at present various anti-corrosion type transducers because the radiant panel appearance is coated with the widely different flexible corrosion protection material of acoustical behavior, in transmitting and receiving ultrasound process, have the considerable part energy to be absorbed or reflect and lose by anticorrosive coat.Make electricity/sound conversion efficiency, the receiving sensitivity of transducer descend greatly, the test blind area is bigger, reaches 0.5～1.2m usually.Therefore have to use higher driving voltage and driving power, cause the complicated of driving circuit.Since anti-corrosion material (particularly plastics) and metal transducing radiant panel combine relatively difficulty, and the thickness of anticorrosive coat has a significant impact hyperacoustic transmission, so the manufacture craft of anticorrosion formula transducing radiant panel is very complicated.Sometimes under the situation that the power of single transducer is difficult to improve, in order to obtain detection range and directive property greatly preferably, usually use a plurality of transducers to line up array format and launch ultrasound wave simultaneously, make that the transducer own vol is huge, manufacturing cost increases, and it is very inconvenient to install.
The purpose of this invention is to provide a kind of novel anticorrosive ultrasonic transducer, this transducer directly utilizes corrosion-resistant rigid material and piezoelectric chip to make one as the transducing radiant panel, this transducer has overcome the existing above-mentioned every deficiency of known anti-corrosion type transducer, has good antiseptic property, very high sensitivity, fabulous directive property, very little blind area, structure and manufacture craft are also very simple.
In this transducer, the transducing radiant panel can adopt any one can with electrode secure bond before the piezoelectric chip, and ultrasound wave had the good transmission performance, have the single resistant material of certain rigidity such as plastics, epoxy resin, pottery etc., make one with electrode before the piezoelectric chip, as the transducing radiant panel.The unlike material that concrete moulding process can be selected for use according to radiant panel adopts cast, pressure injection or mode such as bonding, and above-mentioned radiant panel is assemblied in the transducer housing front end, and the sealing bonnet is equipped with in the housing rear end, constitutes main body of the present invention.Above-mentioned transducing radiant panel structure, change existing anti-corrosion type transducing radiant panel-sheet metal and coated etch resistant material layer version outward, adopt single rigidity resistant material to make the transducing radiant panel, not only can keep hyperacoustic transmission performance constant, the more important thing is and avoided in the prior art, the reflection loss of ultrasound wave between sheet metal face and anti-corrosion layer, thereby improved the transfer efficiency and the sensitivity level of transducer widely, and can guarantee that transducer has good sealing property and decay resistance.
The technological means that the present invention adopts is very simple, but its effect is fairly obvious.Adopt same piezoelectric chip and test condition, when tested distance was chosen to be 3.0m, test result contrasted with using the present invention program's packaging and testing result instead under the anticorrosion encapsulation state of standard rubbers, and the measurement sensitivity of this transducer can improve tens times.Concrete test data sees the following form:
By the contrast of last table test result as can be seen, it is gratifying that above-mentioned special construction designs its result of use, therefore we can say, of the present inventionly finishes and provides a kind of novel range finding ultrasonic transducer for industrial level gauging.
Below in conjunction with accompanying drawing, introduce the specific embodiment of the invention.
In the accompanying drawing, the cylindrical shape of transducer or rectangle housing 1, its material can be for any corrosion resistant material, as plastics, pottery etc.Ultrasound wave planar radiation plate 2 also is simultaneously the node of electrode 3 before supporting, piezoelectric chip 4 and rear electrode 5, makes one with preceding electrode bonding.Its material of planar radiation plate can for any can with the corrosion resistant material of the rigidity of preceding electrode secure bond, as plastics, pottery, epoxy resin.The reflection damping sheet 6 that rubberite is made sticks to above the rear electrode 5.The dividing plate 8 that material and planar radiation plate are similar will be divided into two independently sealed cavities in the transducer housing, cast thickness is 10～20mm.Having filled up acoustic absorbant 7 in the middle of reflection damping sheet 6 and the dividing plate 8 and in the middle of dividing plate and the bonnet 10, as sponge.Abovementioned technology helps improving the conversion efficiency and the sensitivity of transducer.Prime amplifier 9 is fixed on the dividing plate 8 that is made of epoxy resin.Be used for delivering to indicating instrument again after echoed signal with transducer output is amplified to sufficient intensity, this way is very necessary when transducer is far away apart from indicating instrument.Plastic rear cover 10 should be carried out good sealing after outer lead connects, prevent that corrosive gas from entering transducer inside.Insert the temperature-sensing element 11 in the radiant panel 2 in advance, environment temperature is converted to corresponding current signal, carry out temperature compensation, improve measuring accuracy for indicating instrument.
Can see that in the accompanying drawings whole energy transducer shell and transducing radiant panel all are made of the material of acid-alkali-corrosive-resisting, plastic casing 1 inwall and planar radiation plate 2 contacts site have all carried out roughened, with the bond strength of increase with the planar radiation plate.Totally enclosed structure makes it to have good antiseptic property.Can be in the medium-term and long-term normal use of bad working environment.Because preceding electrode 3 is put into wherein when 2 shapings of planar radiation plate, harden with planar radiation and put the palms together before one branch closely reliably, improved conversion efficiency.The optimum thickness of planar radiation plate can be between 8.5～33.0mm, and reflection damping sheet 6 keeps certain interval with outer casing inner wall, and this gap can be 0.1～1.5mm, and the light rubber filling of available flexibility also can not filling.
The present invention is simple in structure, and cost is low, and the test effect is very good, therefore also can promote the use of in other non-aggressive application.When adopting epoxy resin to do the radiant panel face among the present invention, its material require carries out modification to be handled, and can add plastifier and filler in epoxy resin, to reduce the fragility of radiant panel face, increases its hardness.
Claims (6)
1, a kind of totally enclosed ultrasonic transducer, constitute by the piezoelectric chip [4], transducing radiant panel [2], reflection damping sheet [6] and the sealing bonnet [10] that are sealed in the housing [1], it is characterized in that the preceding electrode [3] of said piezoelectric chip [4] and single resistant material with certain rigidity, adopt cast, pressure injection or bonding mode to make one, constitute the transducing radiant panel.
2, ultrasonic transducer according to claim 1 is characterized in that being stained with on the rear electrode [5] of piezoelectric chip [4] the reflection damping sheet [6] that keeps certain interval with housing [1] inwall.
3, ultrasonic transducer according to claim 1 is characterized in that being provided with dividing plate [8] between said housing [1] internal reflection damping sheet [6] and the bonnet [10], and housing [1] is separated into two independently sealed cavities.
4, ultrasonic transducer according to claim 3 is characterized in that being filled with acoustic absorbant respectively in the said independent sealed cavity.
5, ultrasonic transducer according to claim 1 is characterized in that inserting in advance in the said radiant panel [2] temperature-sensing element [11].
6, ultrasonic transducer according to claim 1 is characterized in that said radiant panel [2] is to adopt plastics, epoxy resin, any material of pottery to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111199 CN1096099A (en) | 1993-05-31 | 1993-05-31 | A kind of anticorrosive ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93111199 CN1096099A (en) | 1993-05-31 | 1993-05-31 | A kind of anticorrosive ultrasonic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1096099A true CN1096099A (en) | 1994-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93111199 Pending CN1096099A (en) | 1993-05-31 | 1993-05-31 | A kind of anticorrosive ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1096099A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143061B (en) * | 2007-09-25 | 2010-06-16 | 鄞云光 | Ultrasonic transducer tea cooking machine |
| CN104165052A (en) * | 2013-05-17 | 2014-11-26 | 贵州航天凯山石油仪器有限公司 | Method for improving corrosion resistance of microphone |
| CN105823531A (en) * | 2016-05-20 | 2016-08-03 | 南昌航空大学 | Liquid level indicator applicable to corrosive liquid |
-
1993
- 1993-05-31 CN CN 93111199 patent/CN1096099A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101143061B (en) * | 2007-09-25 | 2010-06-16 | 鄞云光 | Ultrasonic transducer tea cooking machine |
| CN104165052A (en) * | 2013-05-17 | 2014-11-26 | 贵州航天凯山石油仪器有限公司 | Method for improving corrosion resistance of microphone |
| CN105823531A (en) * | 2016-05-20 | 2016-08-03 | 南昌航空大学 | Liquid level indicator applicable to corrosive liquid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |