CN1287266A - Essentially safe composite wide-band ultrasonic flow rate transducer - Google Patents
Essentially safe composite wide-band ultrasonic flow rate transducer Download PDFInfo
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- CN1287266A CN1287266A CN 00119040 CN00119040A CN1287266A CN 1287266 A CN1287266 A CN 1287266A CN 00119040 CN00119040 CN 00119040 CN 00119040 A CN00119040 A CN 00119040A CN 1287266 A CN1287266 A CN 1287266A
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- waveguide
- flow rate
- ultrasonic flow
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Abstract
The present invention is used in flowrate measurement in pipe. The transducer has shielding metal casing and wave guide connected through nylon sleeve, aluminum ring and rubber sleeve, the outer wall of the nylon sleeve is connected to the inner wall of the shielding metal casing, the aluminum ring is inside the nylon sleeve and the rubber sleeve has inner side inserted into the outer groove of the wave guide and outer side inserted into the inner groove of the aluminium ring. In one end of the wave guide, is set one composite piezoelectric pile with positive and negative poles connected to a bridge rectifier comprising four diodes.
Description
The present invention is a kind of intrinsic safety type instrumentation pipeline flow ultrasonic transducer that is used for, and belongs to fluid flow, flow velocity the cannot-harm-detection device technical field.
Ultrasonic flow rate transducer of the prior art:
The necessary and sufficient condition of intrinsic safety type ultrasonic liquid flowmeter transducer is: 1. launching driving voltage is small-signal, as 14 deep-sited pulses only towards voltage; 2. received pulse waveform reverb ripple must not surpass 2-3 cycle after ultrasound wave saw through the fluid pipe wall; 3. and the reverb ripple second round crest should be than period 1 crest difference greater than 12dB (common this amplitude difference of ultrasonic parallel operation is all less than 6dB).
Domestic existing similar its acoustic pressure of ultrasonic flow rate transducer to transmit and receive sensitivity lower, the piezoelectric patches acoustic impedance is higher, the tube wall acoustic damping is big, the passband width is narrow.Especially the unit voltage excitation sound pressure level is very low, and the transducer waveform characteristic of outer clamping is poor.So can't realize the ultrasonic flow rate instrumentation of essential safe type condition.
External typical German Krohnet of late nineteen nineties (section dragon) and Japanese fuji ultrasonic flow rate transducer, the former is for inserting duct type, and the latter is that pipeline is outer clipping.Transducer piezoelectric susceptibility and China quite.Their passband Q value is lower than China, about 3.5 (China Q=4).Former and later two cycle amplitude differences of their reverb ripple are 6dB.So they still need the pulse voltage excitation transducer by last hectovolt, make ultrasound wave be seen through very high tube wall damping on the one hand, must make the enough steep phase of period 1 wave amplitude forward position of reverb on the other hand again, enough stable when getting time delay value with assurance.For this reason, section dragon, Fuji etc. are non-intrinsic safety type liquid stream ultrasonic transducer, and German section dragon has to take the volume heaviness and baroque seal for pipe joints mode, formation flame-proof type ultrasonic flowmeter.
The objective of the invention is at existing domestic and international technical deficiency, invent a kind of highly sensitive, reverb wave property and reach wide band essentially safe composite wide-band ultrasonic flow rate transducer well.
Essentially safe composite wide-band ultrasonic flow rate transducer of the present invention is by waveguide, the nylon collar, the aluminium ring, the rubber collar, metallic shield shells etc. are formed, between the metallic shield outer casing inner wall of this transducer and the waveguide by the nylon collar, the aluminium ring, the rubber collar is connected, the outer wall of the nylon collar is connected with the inwall of metallic shield shell, the aluminium ring is positioned at the inboard of the nylon collar, the inboard of the rubber collar is stuck in the water jacket of waveguide, the outside of the rubber collar is stuck in the inside groove of aluminium ring, waveguide end in the metallic shield shell is provided with composite piezoelectric heap, at the composite piezoelectric heap just, negative the two poles of the earth join with the bridge rectifier circuit of being made up of four diodes respectively.The inboard of the outside of aluminium ring and nylon ring set is a helicitic texture, and the two coincide mutually.The outer end of piling at the composite piezoelectric of waveguide end also is provided with the sound absorption backing.
Advantage of the present invention is: the first, and multilayer ring and rubber case ring structure, unsettled acoustic duct has played fixing and sound decoupling double action, constitutes vibration damper.Sound, electric conversion efficiency have been improved greatly; The second, compound binding piezoelectric chip is glued at waveguide one end, and its employing sandwich " 3-3 " binding is compound or " 1-3 " binding is compound, with PZT (zirconia titanate lead) piezoelectric ceramics and epoxy composite, realizes thick in the single vibration pattern.Piezoelectric coefficient d
33Be higher than the solid wafer of PZT, be not less than 450PC/N, radially coupling coefficient K
pLess than 0.15, transverse vibration is minimum.The acoustic impedance and the very approaching coupling of excellent waveguide (polysulfones) of the brilliant heap of this composite piezoelectric make whole sound system have the one dimension vibration, and waveform is extremely simple, and sending and receiving efficient and sensitivity are high; The 3rd, the transducer frequency of operation is 500kHz, and (3dB), pass-band performance Q is 2 to bandwidth 250kHz.Than low one times of domestic and international frequency of operation 1MHz commonly used, help reducing the acoustic damping of tube wall etc.; The 4th, the isolate waveguide structure is anti-150 ℃ of high temperature, corrosion resistant acoustic impedance resilient material, and shape satisfies: length/diameter guarantees efficient, the unidirectional sound transmission of waveguide than greater than 2.The 5th, brilliant heap polarity reasonable disposition, it is good to obtain the reverb waveform characteristic, and making still can the regime flow instrumentation under the non-amplitude limit condition of ultrasound wave.
Transducer of the present invention adds the sound absorption backing and helps reducing passband Q value, and frequency band is broadened.Transducer pulse reverb is regulated by the proportioning of epoxy tungsten powder.Be provided with four diodes that bridge-type links simultaneously, be parallel to piezoelectric pile two interpolars, constitute the electric breakdown holding circuit that essential safe type requires.Contact conductor adopts and suspends, balanced type links, transducer enclosure and instrument common ground, and this structure input end noise is minimum.Unit voltage excitation remolding sensitivity traditional transducers exceeds 4～5 times.Highly sensitive, advantages such as noise is low, bandwidth, reverb is short and move in the waveform forward position that the present invention has, when pulse voltage " ring ring " driving work, the acoustical behavior stabilizer pole, drift value is minimum (when 8 times " ring ring ", " forward " and " reverse " path difference, when static shift correction, only float 0.01～0.02 μ s.It is particularly useful for accurate instrumentation small-bore (Φ 15mm to Φ 80mm) and the slug flow amount various pipeline flows less than 0.1m/s.The simultaneously alternative function of existing various conventional ultrasonic flow rate transducers both at home and abroad.
Fig. 1 is a structural representation of the present invention.Comprising waveguide 1, nylon ring set 2, aluminium ring 3, the rubber collar 4, metallic shield shell 5, composite piezoelectric heap 6, positive electrode lead-in wire 7, negative electrode lead-in wire 8, bonnet cover 9, twin-core screen cable 10, rectifier bridge 11, sound absorption backing 12.
Embodiment of the present invention are as follows:
According to the structure shown in the accompanying drawing 1, diameter of phi 20mm is adopted in waveguide 1, and the polysulfones insulating material of length 40mm is made the waveguide of clavate; Composite piezoelectric heap 6 is that sandwich 3-3 links compound substance, piezoelectric coefficient d
33Reach 450PC/M, Kp is less than 0.15, wafer size: thick 1.5mm, diameter of phi 17.8mm; So-called composite piezoelectric is brilliant to be piled, and is meant two kinds of phase boundaries of high molecular polymer intercommunication mode connected to each other of piezoelectric crystal and filling.For example 3-3 links, and is exactly that the two-phase stochastic distribution links, and sintering, is injection molded into complex; 1-3 links, and is exactly that piezoelectric phase is made many parallel fine strip shapes, and all the other are filled to complex with polymkeric substance.The rubber collar 4 adopts prefabricated drag reduction Buddhist nun rubber grommet, and this rubber collar borrows aluminium ring 3 fixing; The aluminium ring borrows helicitic texture to be fixed on the nylon ring set 2, and the nylon ring cover is fastened on metallic shield shell 5 inboards that stainless steel is made; In waveguide end, the other end of waveguide is processed inclined-plane at 45 to the composite piezoelectric heap, is used for being coupled with measured piece with epoxy glue.Sound absorption backing 12 is that the material of 3/2 (volume ratio) mixes by epoxy/tungsten powder, and acoustic impedance is 8 * 10PaS/m.Rectifier bridge 11 is made up of four voltage stabilizing diodes, and it is withstand voltage should be greater than 20V.The end of metallic shield shell is provided with bonnet cover 9 on general structure, is provided with center pit at the center of bonnet cover, and double core shielding cable 10 is drawn by the center pit of bonnet cover from the inside of this transducer.Other end inboard at the metallic shield shell is fixed with nylon ring set 2, the inboard of nylon ring set and aluminium ring 3 are coincide by screw thread, be provided with groove one in the inboard of aluminium ring, the outside in waveguide also is provided with a groove, the outside of the rubber collar 4 is stuck in the groove of aluminium ring 3, and the inboard of the rubber collar is stuck in the groove of waveguide 1.Just can realize the present invention according to the above.
Claims (3)
1. essentially safe composite wide-band ultrasonic flow rate transducer, form by metallic shield shell and waveguide etc., it is characterized in that between metallic shield shell (5) inwall of this transducer and the waveguide (1) by the nylon collar (2), aluminium ring (3), the rubber collar (4) is connected, the outer wall of the nylon collar (2) is connected with the inwall of metallic shield shell (5), aluminium ring (3) is positioned at the inboard of the nylon collar (2), the inboard of the rubber collar (4) is stuck in the water jacket of waveguide (1), the outside of the rubber collar (4) is stuck in the inside groove of aluminium ring (3), the end of the waveguide (1) in metallic shield shell (5) is provided with composite piezoelectric heap (6), at composite piezoelectric heap (6) just, negative the two poles of the earth join with the bridge rectifier circuit of being made up of four voltage stabilizing diodes respectively.
2. essentially safe composite wide-band ultrasonic flow rate transducer according to claim 1 is characterized in that, the inboard of the outside of aluminium ring (3) and nylon ring set (2) is a helicitic texture, and the two coincide mutually.
3. essentially safe composite wide-band ultrasonic flow rate transducer according to claim 1 and 2 is characterized in that the outer end of piling (6) at the composite piezoelectric of waveguide (1) end also is provided with sound absorption backing (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119040 CN1117968C (en) | 2000-10-19 | 2000-10-19 | Essentially safe composite wide-band ultrasonic flow rate transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00119040 CN1117968C (en) | 2000-10-19 | 2000-10-19 | Essentially safe composite wide-band ultrasonic flow rate transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1287266A true CN1287266A (en) | 2001-03-14 |
| CN1117968C CN1117968C (en) | 2003-08-13 |
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ID=4587435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00119040 Expired - Fee Related CN1117968C (en) | 2000-10-19 | 2000-10-19 | Essentially safe composite wide-band ultrasonic flow rate transducer |
Country Status (1)
| Country | Link |
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| CN (1) | CN1117968C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368041A (en) * | 2010-06-29 | 2012-03-07 | 丹尼尔度量和控制公司 | Method and system of ultrasonic flow meter transducer assembly |
| CN102708851A (en) * | 2012-06-25 | 2012-10-03 | 唐山海通电子有限公司 | Transmitting-receiving underwater transducer |
| CN109155882A (en) * | 2016-05-10 | 2019-01-04 | 伯斯有限公司 | sound device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100392394C (en) * | 2004-11-18 | 2008-06-04 | 汕头超声仪器研究所 | Backing material for ultrasonic detection probe and manufacturing method thereof |
-
2000
- 2000-10-19 CN CN 00119040 patent/CN1117968C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102368041A (en) * | 2010-06-29 | 2012-03-07 | 丹尼尔度量和控制公司 | Method and system of ultrasonic flow meter transducer assembly |
| CN102368041B (en) * | 2010-06-29 | 2013-05-08 | 丹尼尔度量和控制公司 | Method and system of ultrasonic flow meter transducer assembly |
| CN102708851A (en) * | 2012-06-25 | 2012-10-03 | 唐山海通电子有限公司 | Transmitting-receiving underwater transducer |
| CN109155882A (en) * | 2016-05-10 | 2019-01-04 | 伯斯有限公司 | sound device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1117968C (en) | 2003-08-13 |
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