CN101029843B - Anti-intrusion ultrasonic sensor - Google Patents
Anti-intrusion ultrasonic sensor Download PDFInfo
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- CN101029843B CN101029843B CN2006100590381A CN200610059038A CN101029843B CN 101029843 B CN101029843 B CN 101029843B CN 2006100590381 A CN2006100590381 A CN 2006100590381A CN 200610059038 A CN200610059038 A CN 200610059038A CN 101029843 B CN101029843 B CN 101029843B
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Abstract
A ultrasonic transducer of interference proof type is prepared as jacketing interference-proof jacket tube at external side of ultrasonic transducer, setting internal side of middle section on said jacket tube to be form fitted dynamically with external side of said transducer and to be parallel as well as with space to external side of said transducer, setting front section of said jacket tube to be horn form, arranging nozzle at back part of said jacket tube and using said nozzle to connect with said transducer.
Description
Technical field
The present invention relates to a kind of range finding and use the ultrasonic sensor structure, belong to supersonic wave level sensor and supporting parts thereof.
Technical background
Ultrasonic material level meter is to utilize the acoustic reflection principle to measure the interior liquid level of various containers or the instrument of solid material level.Generally be made up of ultrasonic sensor and electronic unit, ultrasonic sensor and electronic unit can be designed to integral type or split type composition mode.The ultrasonic sensor liquid level in tested container or charge level emission ultrasound wave and receive reflection echo under the control of electronic unit.
Usually advanced ultrasonic material level meter electronic unit adopts the method for automated power control to launch ultrasound wave, promptly along with the measured object position from the near to the remote, the ultrasonic waves transmitted energy increases gradually; This is that more macro-energy is sent more, could guarantee that echo is reflected because distance is far away more; For electronic unit detects, and in-plant the time, can make the ultrasonic energy that sends smaller; Electronic unit also can detect, but for tested liquid level and charge level, they are always not smooth; Even so distance near the time, the ultrasound wave that sends also must have certain intensity.Adopt the method for automatic gain control to discern for the reflection echo electronic unit; Promptly along with the measured object position from the near to the remote, the enlargement factor of echoed signal is increased gradually, distance is near more; Reflection echo is strong more; Needed enlargement factor is just little, and the enlargement factor to in-plant spurious echo is also little simultaneously, makes spurious echo be difficult for being detected.
When tested container was closed container, ultrasonic material level meter was installed on the flange port of container usually, shown in accompanying drawing 1.This mounting means requires the adapter between ring flange and the container very short usually, and assurance ultrasonic sensor fore-end will be stretched in taking over, and its reason is if ultrasonic sensor integral body is positioned at when taking over; The ultrasound beamformer that sensor emission goes out produces stronger reflection between can and taking over, and spurious signal occurs, takes over longer, thin more; Spurious signal is strong more; Even adopt automated power control and automatic gain control,, also can be detected by electronic unit because spurious signal is strong excessively; Thereby disturb the detection of normal signal, make the level meter cisco unity malfunction.
Ultrasonic sensor is normally cylindrical, and inside is piezoelectric transducer, is encapsulated by the cylindrical plastic shell, and piezoelectric transducer sees through the sensor housing front end and outwards launches ultrasound wave, and receives reflection echo, produces electric signal.Because sensor outer housing front end and side are structure as a whole, therefore when working sensor, its side also has faint relatively ultrasound wave and outwards sends.When ultrasonic sensor integral body is positioned at the container adapter; If the faint ultrasound wave that sensors sides is sent is reflected by nozzle inner wall; And its stroke is greater than sensor remained shock life period, and this reflected signal will be detected so, becomes undesired signal.Simultaneously; The ultrasound beamformer that sensor front end is outwards sent has certain spread angle, if sensor integral body is positioned at container when taking over, ultrasound beamformer can with take over medial surface and the adapter circular edge had an effect; Produce stronger reflection echo; By sensor is received, and then detected, become undesired signal by electronic unit.
Normal conditions are, the length that the flange on the closed container is taken over is general all greater than the length of ultrasonic sensor.Want to satisfy the installation requirement of ultrasonic material level meter, just must transform, and this transformation difficulty does not very normally allow container is transformed under a lot of situation the adapter on the container.
Summary of the invention
The present invention will solve ultrasonic material level meter in the prior art to take over when longer the side and take over the problem that circular edge reflects interference wave at container; A kind of outer tube and the ultrasonic sensor that has anti-intrusion sleeving tube of anti-intrusion ultrasonic sensor have been proposed; Adopt this outer tube can make ultrasonic material level meter satisfy adapter on the container request for utilization when longer; Can reduce ultrasonic beam greatly and take between volume reflection, make the degree that this volume reflection can be attenuated to can not become undesired signal.
The anti-intrusion sleeving tube of ultrasonic sensor of the present invention; It is characterized in that: the outer tube stage casing is inboard to be the shape that matches movingly with the ultrasonic sensor lateral surface; Be enclosed within the outside of ultrasonic sensor; Outer tube stage casing medial surface and ultrasonic sensor lateral surface are parallel to each other and leave at interval, and the leading portion that outer tube exceeds the ultrasonic sensor surface of emission is horn-like, the latter half of interface that is connected with ultrasonic sensor that is provided with of outer tube.Form the anti-intrusion ultrasonic sensor that has anti-intrusion sleeving tube of the present invention; Ultrasonic sensor is arranged and be enclosed within the outer tube on the ultrasonic sensor; It is characterized in that: outer tube stage casing medial surface and ultrasonic sensor lateral surface parallel and leave at interval; The leading portion that outer tube exceeds the ultrasonic sensor surface of emission is horn-like, and the latter half of sleeve pipe is provided with interface and the ultrasonic sensor outside and is fixedly connected outside.
As shown in Figure 2; Outer tube 2 is enclosed within the outside of ultrasonic sensor 1; Outer tube stage casing medial surface and ultrasonic sensor lateral surface are parallel to each other and leave at interval, and its relative spacing preferably is not more than 1.5 millimeters, if bigger at interval; Sound absorption, sound insulating material should at interval, be added, like sponge, foamed plastic film.
Outer tube exceeds the ultrasonic sensor surface of emission foremost, and the bore of the leading portion of outer tube (promptly beginning this part forward from the ultrasonic sensor surface of emission) becomes greatly gradually, is toroidal, and medial surface can be tapered plane or arc surface.This a part of length of the leading portion of outer tube is more preferably greater than 10 millimeters; The shortest line on the outer tube leading portion hydraucone medial surface from the peak to the minimum point and the angle of sensor emission face are preferably between 105 degree to 125 degree, and the relative acute angle that is to say the shortest line and the sensor emission face of its medial surface from the peak to the minimum point is preferably between 55 degree spend to 75.The latter half of sleeve pipe fixes through the shell of screw thread or mode such as bonding and sensor outside.
When the interval of outer tube stage casing medial surface and ultrasonic sensor lateral surface hour; The faint ultrasound wave that the ultrasonic sensor lateral surface sends can repeatedly reflect most energy and attenuated fast in this little interval; And the time that these most reflected energies exist is sent the remained shock time behind the ultrasound wave less than sensor, and remaining reflected energy is not owing to very faintly just can become undesired signal.When the interval of outer tube stage casing medial surface and ultrasonic sensor lateral surface was big, owing to add sound absorption, sound insulating material at interval, the faint ultrasound wave that the ultrasonic sensor lateral surface sends can not become undesired signal yet.
Because the leading portion inboard of outer tube is a toroidal; The ultrasound beamformer angle that ultrasonic sensor is sent forward narrows down; Acoustic wave energy can be propagated to the direction perpendicular to the surface of emission as far as possible, in the time of in this ultrasonic sensor with outer sleeve structure is installed on the container adapter, can reduce the volume reflection between ultrasonic beam and the adapter greatly; Make this volume reflection to be attenuated to and to be become undesired signal by the detected degree of electronic unit.
Ultrasonic material level meter with above-mentioned outer sleeve structure can satisfy adapter on the container request for utilization when longer; Under the ultrasonic emitting energy condition identical with the echo enlargement factor; Can make by the volume reflection that take over to produce be reduced to when the encased pipe not below 10%, can not be detected by electronic unit.This outer sleeve structure is simple simultaneously, makes easily, and is easy for installation.It is compact that its structure combines with ultrasonic sensor, and whole ultrasonic sensor profile and the change in size that has an outer tube is less, need not change the mounting condition on the container, is beneficial to installation.
Description of drawings
Fig. 1 is the mounting means of existing ultrasonic material level meter on closed container.
Fig. 2 is the constitutional diagram of outer tube of the present invention and ultrasonic sensor.
Fig. 3 has the anti-intrusion ultrasonic sensor cut-open view of anti-intrusion sleeving tube for the specific embodiment of the invention.
Embodiment
Preferred embodiment below in conjunction with a description of drawings indefiniteness of the present invention.
As shown in Figure 3, be the anti-intrusion ultrasonic sensor that has anti-intrusion sleeving tube of the present invention, ultrasonic sensor is cylindrical; Constitute by the sensor housing 4 of piezoelectric transducer 3 with the encapsulation piezoelectric transducer; Piezoelectric transducer is made up of piezoelectric crystal and front and back electrode, and piezoelectric transducer 3 external diameters are 38 millimeters, thick 30 millimeters; The front end external diameter of sensor housing 4 is 52 millimeters, and housing 4 length are 100 millimeters.In the outside of housing 4 is outer tube 5, and outer tube 5 is cylindrical, and its external diameter is 58 millimeters, and length is 100 millimeters.Outer tube 5 stage casing medial surfaces and housing 4 lateral surfaces are parallel to each other and leave at interval, and its relative spacing is 1 millimeter.It is fixing that outer tube 5 rear interface adopt engage thread to be connected with housing 4.Outer tube 5 front portions are 18 millimeters from this a part of height that housing 4 front end faces begin forward, and its bore becomes greatly gradually, and internal diameter size is from 48 millimeters increase to top 58 millimeters, and outer tube 5 anterior medial surfaces are taper surface.For keeping attractive in appearance; Improve structural compactness; Do not weaken simultaneously sensor emission again and receive hyperacoustic ability; The outer tube leading portion be horn-like and the stage casing cylindricality between a closing in is arranged, the closing in plane of structure cooperates with ultrasonic sensor surface of emission outer shroud side edge, can add rubber or plastic washer between the two and isolate.Housing 4 is plastics with the material of outer tube 5, like PVC, polypropylene etc.The ultrasonic sensor inner space is filled by acoustic absorbant sponge 7.The lateral surface rear portion of ultrasonic sensor housing 4 is for installing screw thread 6, is used for the installing and fixing of whole ultrasonic wave sensor, and the top screw thread that screw thread 6 is installed is used for fixing outer tube 5.
Claims (5)
1. anti-intrusion ultrasonic sensor that has outer tube; Ultrasonic sensor and the outer tube that is enclosed within ultrasonic sensor are arranged; It is characterized in that: outer tube stage casing medial surface and ultrasonic sensor lateral surface parallel and leave at interval; The leading portion that outer tube exceeds the ultrasonic sensor surface of emission is horn-like, and the latter half of interface of outer tube is fixedly connected with the ultrasonic sensor outside.
2. like the said anti-intrusion ultrasonic sensor of claim 1, it is characterized in that: the outer tube leading portion that exceeds the ultrasonic sensor surface of emission begins forward this a part of bore from the ultrasonic sensor surface of emission and becomes gradually and be horn-like greatly.
3. like the said anti-intrusion ultrasonic sensor of claim 1; It is characterized in that: outer tube is has a closing between horn-like leading portion and the stage casing, and the closing in plane of structure cooperates with ultrasonic sensor surface of emission outer shroud side edge and perhaps adds rubber or plastic washer isolation between the two.
4. like the said anti-intrusion ultrasonic sensor of claim 1, it is characterized in that: the interval of outer tube stage casing medial surface and ultrasonic sensor lateral surface is less than or equal to 1.5 millimeters, perhaps interior at interval acoustic absorbant or the sound insulating material of adding.
5. like the said anti-intrusion ultrasonic sensor of claim 1, it is characterized in that: the shortest line on the outer tube leading portion hydraucone medial surface from the peak to the minimum point and the angle of sensor emission face are between 105 degree to 125 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100590381A CN101029843B (en) | 2006-02-27 | 2006-02-27 | Anti-intrusion ultrasonic sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100590381A CN101029843B (en) | 2006-02-27 | 2006-02-27 | Anti-intrusion ultrasonic sensor |
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| Publication Number | Publication Date |
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| CN101029843A CN101029843A (en) | 2007-09-05 |
| CN101029843B true CN101029843B (en) | 2012-05-30 |
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| CN2006100590381A Active CN101029843B (en) | 2006-02-27 | 2006-02-27 | Anti-intrusion ultrasonic sensor |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4183007A (en) * | 1978-02-22 | 1980-01-08 | Fischer & Porter Company | Ultrasonic transceiver |
| US4264788A (en) * | 1979-01-31 | 1981-04-28 | Princo Instruments, Inc. | Damped ultrasonic detection unit |
| CN2166466Y (en) * | 1993-06-23 | 1994-05-25 | 董志伟 | Full-closed ultrasound wave energy transducer |
| CN2511982Y (en) * | 2001-08-31 | 2002-09-18 | 周卫国 | Probe for miniature ultrasonic sensor |
| CN2681098Y (en) * | 2004-03-21 | 2005-02-23 | 董志伟 | Ultrasonic probe |
| CN2747589Y (en) * | 2004-11-24 | 2005-12-21 | 黄军 | Probe for ultrasonic wave sensor |
| CN2869805Y (en) * | 2006-02-27 | 2007-02-14 | 董志伟 | Supersonic-wave sensor external sleeve pipe |
-
2006
- 2006-02-27 CN CN2006100590381A patent/CN101029843B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4183007A (en) * | 1978-02-22 | 1980-01-08 | Fischer & Porter Company | Ultrasonic transceiver |
| US4264788A (en) * | 1979-01-31 | 1981-04-28 | Princo Instruments, Inc. | Damped ultrasonic detection unit |
| CN2166466Y (en) * | 1993-06-23 | 1994-05-25 | 董志伟 | Full-closed ultrasound wave energy transducer |
| CN2511982Y (en) * | 2001-08-31 | 2002-09-18 | 周卫国 | Probe for miniature ultrasonic sensor |
| CN2681098Y (en) * | 2004-03-21 | 2005-02-23 | 董志伟 | Ultrasonic probe |
| CN2747589Y (en) * | 2004-11-24 | 2005-12-21 | 黄军 | Probe for ultrasonic wave sensor |
| CN2869805Y (en) * | 2006-02-27 | 2007-02-14 | 董志伟 | Supersonic-wave sensor external sleeve pipe |
Non-Patent Citations (1)
| Title |
|---|
| US 4183007 A,全文. |
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| Publication number | Publication date |
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| CN101029843A (en) | 2007-09-05 |
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Effective date of registration: 20181010 Address after: 116021 2 4, 1 unit 1, the Yellow River Road, Shahekou District, Dalian, Liaoning. Patentee after: Dalian Hilevel Instrument Co., Ltd. Address before: 116023 room 402, 493 Southwest Road, Shahekou District, Dalian, Liaoning. Patentee before: Dong Zhiwei |