CN2050972U - Harmonic vibration type supersonic sensor for air leakage testing - Google Patents
Harmonic vibration type supersonic sensor for air leakage testing Download PDFInfo
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- CN2050972U CN2050972U CN 89211240 CN89211240U CN2050972U CN 2050972 U CN2050972 U CN 2050972U CN 89211240 CN89211240 CN 89211240 CN 89211240 U CN89211240 U CN 89211240U CN 2050972 U CN2050972 U CN 2050972U
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- harmonic vibration
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- air leakage
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Abstract
The utility model discloses a harmonic vibration type supersonic sensor for testing air leakage, comprising a piezoelectric chip, an energy gathering cavity, a screening cover and an impedance converter. The utility model is characterized in that the piezoelectric chip which adopts a structure in the type of mechanical harmonic vibration is composed of piezoelectric ceramic, adhesive accessories and a fixed frame; the energy gathering cavity is made of polypropylene light plastics; the impedance converter is composed of a transformer made of high magnetic material, an amplifier and an emitter follower. The utility model has the advantage of high sensitivity, and can be used for testing the existence and the site of weak leakage in an environment with strong audio-frequency noise.
Description
The utility model is a kind of sensor that is used for ultrasonic air leak detection, belongs to the Ultrasonic Detection sensor technical field.
Ultrasonic leak detection sensor of the prior art:
Domestic existing supersonic leak detector all is operated near the 20KHZ frequency, lower, the poor anti-interference of its sensitivity, and it is non-directional to pop one's head in.So they are not suitable for the leak detection of feeble signal under forte audio-frequency noise interference environment.
External typical supersonic leak detector is a HP Model4905A type detector, and it is more highly sensitive than domestic supersonic leak detector.But its piezo chips is not to be operated in the mechanical resonant state, but constitutes electric resonance by the potsherd direct capacitance with a telefault in parallel, flows to main frame again and continue to amplify after transistor amplifies.
Therefore, its probe sensor sensitivity does not reach under the strong audio-frequency noise environment yet, the requirement of Detection of Weak Signals.Secondly poly-the shaking of HP Model4905A type can be heavy, and antijamming capability is also not high.Aspects such as directivity angle of release and machinery amplification all also need further to improve.
The purpose of this utility model is at deficiency of the prior art, and a kind of highly sensitive ultrasonic leak detection sensor is provided, and is used for detecting the existence and the position of the faint leakage of strong audio-frequency noise environment.
The utility model is made up of piezo chips, cumulative chamber, radome and impedance transducer, be characterized in that piezo chips (4) adopts mechanical resonant formula structure, it is made of piezoelectric ceramics, bonding condiment and fixed mount, and the resonant frequency of total is 38～45KHZ.(1～2mm) suspends is fixed on the small bore end in cumulative chamber (3) to piezo chips (4), and is connected with impedance transducer (4) with stub cable lead-in wire at certain intervals.Cumulative chamber (3) adopts the polypropylene light plastic to make.Transformer, amplifier and emitter follower that impedance transducer (5) is made by high magnetic material are formed, and are complicated electroacoustic four-terminal-network load transition pure resistor load and output cable end (6) coupling.
The utlity model has advantages such as very high sensitivity and signal to noise ratio (S/N ratio), be suitable for detecting under the strong audio-frequency noise occasion feeble signal and use.The cumulative chamber adopts the polypropylene light plastic to make, and has improved the inwall smooth finish that is shaped.In order to improve vertical cumulative effect and anti-interference (reducing lateral) effect, the length in cumulative chamber increases than prior art and is twice.Owing to adopt the resonant mode piezo chips, adopt the transformer coupled input end of high magnetic material, and improve gain with amplifier and realize the transmission coupling, thereby make the complete machine effect improve 4～5 times than the signal to noise ratio (S/N ratio) of prior art to impedance transducer.Can be widely used in the occasion that appearance such as static pressure container or pipeline, pressurizing cable friction and arc discharge are leaked.
Accompanying drawing is a structural representation of the present utility model.
The utility model can take following scheme to realize that according to structure shown in the drawings, the diameter at butt end in cumulative chamber selects 32mm, top diameter is got 4mm, length is got 125mm, and metal guard (1) adopts the guard of stainless steel and rubber casting unification body, and radome (2) adopts nickel plating alloy to cast.Piezo chips is by PZT, P
5Reception type piezoelectric ceramic piece and fixed mount constitute, the optional 43KHZ of the resonance frequency of piezoelectric ceramic piece, the diameter of piezoelectric ceramic piece can be 9mm, thickness 0.5mm, fixed mount is made with bakelite, piezoelectric ceramic piece sticks on the bakelite frame with vulcanized rubber at room temperature, and (1～2mm) suspends is fixed on the little cephalic par in cumulative chamber to whole piezo chips at a certain distance.In order to improve the receiving area of sound wave, be provided with tubaeform cone at the piezoelectric ceramic piece front end, to be that the aluminium about 0.1mm is thin be washed into this cone available thickness.Impedance transducer adopts the transformer of 1:10, and amplifier adopts the 3DM3C transistor to form, and emitter follower adopts the 3DM3C transistor of high-amplification-factor to form.When the static pressure container, the leak that diameter is 0.01mm to 3mm appears in pressurizing cable or vacuum system, pressure differential is greater than 0.5 atmospheric pressure, distance is during greater than 3m, friction produces ultrasonic spectrum to air-flow to hole wall, this sound spectrum can reach 50KHZ, faint friction is ultrasonic amplifies through the cumulative chamber, and mate with sensor input sound end, changing acoustic energy by piezo chips is electric signal, by impedance transducer the resonance electric signal is passed to the main amplifier and the senior filter of leak locator again, extracts difference frequency signal, amplify through audio frequency again, detect the existence and the position thereof of leakage failure through loudspeaker (or earphone) sounding.
Claims (4)
1, a kind of sensor that is used for ultrasonic air leak detection is made up of piezo chips, cumulative chamber, radome and impedance transducer, it is characterized in that piezo chips (1) adopts mechanical resonant formula structure, and it is made of piezoelectric ceramics, bonding condiment and fixed mount.
2, sensor according to claim 1 is characterized in that transformer, amplifier and emitter follower that impedance transducer is made by high magnetic material form.
3,, it is characterized in that the piezo chips suspension is fixed on the small bore end in cumulative chamber, and be connected with impedance transducer with bee-line according to claim 1,2 described sensors.
4, sensor according to claim 3 is characterized in that the piezoelectric ceramic piece front end is provided with the thin tubaeform cone that is washed into of aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89211240 CN2050972U (en) | 1989-03-24 | 1989-03-24 | Harmonic vibration type supersonic sensor for air leakage testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89211240 CN2050972U (en) | 1989-03-24 | 1989-03-24 | Harmonic vibration type supersonic sensor for air leakage testing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2050972U true CN2050972U (en) | 1990-01-10 |
Family
ID=4867528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89211240 Granted CN2050972U (en) | 1989-03-24 | 1989-03-24 | Harmonic vibration type supersonic sensor for air leakage testing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2050972U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910772A (en) * | 2016-05-18 | 2016-08-31 | 广东溢达纺织有限公司 | Ultrasonic leakage detection device and ultrasonic leakage detection method |
| CN108369201A (en) * | 2015-12-18 | 2018-08-03 | 莱特拉姆有限责任公司 | Conveyer measuring system |
-
1989
- 1989-03-24 CN CN 89211240 patent/CN2050972U/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108369201A (en) * | 2015-12-18 | 2018-08-03 | 莱特拉姆有限责任公司 | Conveyer measuring system |
| CN105910772A (en) * | 2016-05-18 | 2016-08-31 | 广东溢达纺织有限公司 | Ultrasonic leakage detection device and ultrasonic leakage detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |