CN201251459Y - Energy converter provided with foam plastic matching layer - Google Patents
Energy converter provided with foam plastic matching layer Download PDFInfo
- Publication number
- CN201251459Y CN201251459Y CNU2008201523035U CN200820152303U CN201251459Y CN 201251459 Y CN201251459 Y CN 201251459Y CN U2008201523035 U CNU2008201523035 U CN U2008201523035U CN 200820152303 U CN200820152303 U CN 200820152303U CN 201251459 Y CN201251459 Y CN 201251459Y
- Authority
- CN
- China
- Prior art keywords
- matching layer
- foam plastic
- transducer
- polyfoam
- gas
- 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 - Fee Related
Links
Abstract
An energy converter provided with foam plastic matching layer relates to the manufacture technique of energy converters and is used in a gas ultrasonic flowmeter to measure pressure gas. A foam plastic matching layer adopts macromolecule foaming materials to manufacture a nanometer grade vacuum glass bead through foaming, the matching layer is pasted on a front cover plate (2) through adhesive, the performance of the foam plastic matching layer is reliable, the occupied area is small, the outer shape is beautiful, the foam plastic matching layer can not be deformed easily and can not be eroded and polluted easily, the foam plastic matching layer can effectively lower attenuation of sound waves in gas and can improve the signal sensitivity of the energy converters, and the pressure gas can be measured through adopting the gas ultrasonic flowmeter of the energy converter.
Description
Technical field
Be equipped with the transducer of polyfoam matching layer, relate to the manufacturing technology of transducer, be used for the gas ultrasonic flowmeter body of calming the anger is measured.
Background technology
In ultrasonic engineering,, two media acoustic impedance mismatch often takes place owing to causing the acoustic propagation situation of difficult.Front shroud material therefor on the transducer that uses in the gas ultrasonic flowmeter generally is the stable light metal of physical and chemical performance (as: aluminium), the acoustic impedance of this light metal and tested pipeline gas differs bigger, because the significant difference of impedance not only can reduce the interface transmission coefficient, and make the transducer piezoelectric chip with high Q value resonance, frequency band is narrow and pulse is long, thereby have a strong impact on the emission receiving sensitivity and the axial resolution of gage probe, and the degree of enriching of information.For the signal sensitivity of being popped one's head in preferably, usually between the serious medium of mismatch, adopt the method that matching layer is set to realize that the acoustic impedance transition is to obtain measurement effect preferably.At present the matching layer that transducer is commonly used is cork, polyester sheet etc., but that the matching layer of this class material exists is yielding, be subject to temperature, influence that pressure changes, and be corroded easily, shortcoming such as pollution, can have a strong impact on the measurement result of gas ultrasonic flowmeter.Especially measure the body of calming the anger, as: rock gas or other pipeline gas, because often contain impurity (coal tar, moisture etc.) in the pipeline gas, also there are temperature, pressure requirement in the scene, so adopt the transducer of this class matching layer can not be used for the gas ultrasonic flowmeter the body of calming the anger is measured.
Summary of the invention
At the deficiency of existing ultrasonic transducer matching layer, the utility model provides a kind of simple in structure, dependable performance, little, the good looking appearance that takes up room, the transducer that is equipped with the polyfoam matching layer that measurement effect is good.
The polyfoam matching layer that the utility model transducer adopts is to utilize high molecular foam material that nano level vacuum glass pearl is become solids and makes its physical stability through foaming: indeformable under 3000 meters depth of waters, and water-intake rate is less than 2%; Density is 0.5-0.55g/cm
3The velocity of sound is 800m/s, and specific acoustic impedance is 0.4 * 10
6Pasm
-1, this polyfoam can reduce the decay of sound wave in gas greatly, and significantly improves the sensitivity of transducer signal, can use safely in the corrosive gas of pH value in 4～10 scopes.
The utility model transducer is made like this: the polyfoam matching layer of selecting thickness 2～6mm according to transducer frequency, semaphore request, the diameter of polyfoam matching layer requires consistent with the end face diameter of transducer front shroud, sticks on by cementing agent on the front shroud of transducer.
Advantage of the present utility model is; The dependable performance of polyfoam matching layer, simple in structure, little, good looking appearance takes up room; Can be implemented in the pipeline under-25 ℃～55 ℃ working temperatures the flow measurement of the body of calming the anger is arranged, and matching layer is not yielding, is difficult for being corroded, polluting, and can effectively reduce the decay of sound wave in gas, improves the sensitivity of ultrasonic transducer signal.
Description of drawings
Accompanying drawing is the utility model embodiment synoptic diagram, among the figure:
Piezoelectric chip part 1, front shroud 2, polyfoam matching layer 3, epoxy resin 4.
Embodiment
The utility model transducer is at first selected the polyfoam matching layer 3 of thickness 2～6mm according to the requirement of frequency, signal, fixedly be bonded on the front shroud 2 by epoxy resin then to form.Its making step is as follows,
1. with the end face absolute ethyl alcohol wiped clean of the front shroud 2 of transducer, spread very thin one deck epoxy resin 4 equably;
2. the end face absolute ethyl alcohol wiped clean of the polyfoam matching layer 3 that combines with front shroud 2 is spread very thin one deck epoxy resin 4 equably;
3. the front shroud 2 that will smear the transducer of epoxy resin 4 is aimed at polyfoam matching layer 3 and is fitted tightly;
4. after posting, the peripheral surface outside polyfoam matching layer 3 is exposed to is spread very thin one deck epoxy resin 4 edge sealing equably with the absolute ethyl alcohol wiped clean;
5. the transducer that will post polyfoam matching layer 3 is put into baking oven 60 ℃ of following bakings half an hour, after treating that epoxy resin 4 solidifies, make the transducer that is equipped with the polyfoam matching layer, be used for sound path ultrasonic flowmeter big, that the transducer signal sensitivity is had relatively high expectations the measurement of the body flow of calming the anger is arranged.
Following subordinate list is an example with the transducer of Φ 28, provides to adopt before and after the polyfoam matching layer data of the wave-shape amplitude of being surveyed under different temperatures.
Subordinate list
Claims (2)
1. be equipped with the transducer of polyfoam matching layer, by piezoelectric chip (1), front shroud (2), polyfoam matching layer (3), epoxy resin (4) constitutes, and it is characterized in that: polyfoam matching layer (3) is bonded and fixed on the front shroud (2) of transducer by cementing agent.
2. transducer according to claim 1 is characterized in that: polyfoam matching layer (3) is with high molecular foam material nano level vacuum glass pearl to be made through foaming, and its water-intake rate is less than 2%, and density is 0.5-0.55g/cm
3, the velocity of sound is 800m/s, specific acoustic impedance is 0.4 * 10
6Pasm
-1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201523035U CN201251459Y (en) | 2008-08-25 | 2008-08-25 | Energy converter provided with foam plastic matching layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201523035U CN201251459Y (en) | 2008-08-25 | 2008-08-25 | Energy converter provided with foam plastic matching layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201251459Y true CN201251459Y (en) | 2009-06-03 |
Family
ID=40747131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201523035U Expired - Fee Related CN201251459Y (en) | 2008-08-25 | 2008-08-25 | Energy converter provided with foam plastic matching layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201251459Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540152A (en) * | 2012-07-24 | 2014-01-29 | 常州波速传感器有限公司 | Gradual transition acoustic impedance matching material production method |
-
2008
- 2008-08-25 CN CNU2008201523035U patent/CN201251459Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540152A (en) * | 2012-07-24 | 2014-01-29 | 常州波速传感器有限公司 | Gradual transition acoustic impedance matching material production method |
| CN103540152B (en) * | 2012-07-24 | 2016-08-10 | 常州波速传感器有限公司 | Gradual transition acoustic impedance match material compound method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA NATIONAL NUCLEAR SHANGHAI WEISI INSTRUMENT C Free format text: FORMER NAME: SHANGHAI WEISI INSTRUMENT INSTRUMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 11, No. 200233, building 1, former science and technology garden, No. 396, Guilin Road, Shanghai Patentee after: Shanghai China Nuclear Weisi Instrument Co., Ltd. Address before: 11, No. 200233, building 1, former science and technology garden, No. 396, Guilin Road, Shanghai Patentee before: Shanghai Weisi Instrument Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090603 Termination date: 20120825 |