CN112317287A - Air-medium ultrasonic transducer - Google Patents
Air-medium ultrasonic transducer Download PDFInfo
- Publication number
- CN112317287A CN112317287A CN202011246952.3A CN202011246952A CN112317287A CN 112317287 A CN112317287 A CN 112317287A CN 202011246952 A CN202011246952 A CN 202011246952A CN 112317287 A CN112317287 A CN 112317287A
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- Prior art keywords
- wire
- ultrasonic transducer
- heating wire
- air
- lead
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Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims abstract description 22
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 19
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000012528 membrane Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 6
- 230000010354 integration Effects 0.000 description 6
- 229910000679 solder Inorganic materials 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910010293 ceramic material Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011295 pitch Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0644—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element
- B06B1/0655—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a single piezoelectric element of cylindrical shape
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a gas medium ultrasonic transducer, which comprises an integrated shell, wherein a heating wire, a metal tube, a grounding wire, a positive wire and a negative wire are arranged in the integrated shell, the grounding wire is connected with the metal tube, the positive wire, the negative wire and the heating wire are arranged in the metal tube in a penetrating manner, a back lining and a piezoelectric ceramic tube are arranged at the upper part of the integrated shell, the piezoelectric ceramic tube is connected with the back lining, a first welding spot and a second welding spot are arranged on the piezoelectric ceramic tube, the positive wire is welded at the first welding spot, the negative wire is welded at the second welding spot, and the positive wire and the negative wire are connected with an ultrasonic driving power supply. The invention ensures the high sensitivity and high emission efficiency of the ultrasonic transducer.
Description
Technical Field
The invention belongs to the technical field of gas flow rate monitoring, and particularly relates to a gas medium ultrasonic transducer.
Background
Ultrasonic transducers generally have the following: the ultrasonic transducer comprises an electrostatic ultrasonic transducer, a piezoelectric composite ultrasonic transducer, a laminated bending vibration piezoelectric ultrasonic transducer and a laminated bending vibration piezoelectric ultrasonic transducer.
Electrostatic ultrasonic transducer: micromechanical MEMS transducers also belong to electrostatic transducers. The structure is similar to a parallel plate capacitor and generally consists of a sheet of tensioned metal film and a fixed back electrode. The radiation impedance of the transducer with the structure is small and the transmission efficiency is high because the metal film is light.
Piezoelectric ultrasonic transducer: the ultrasonic transducer is manufactured by utilizing the piezoelectric effect and the inverse piezoelectric effect of materials. The vibrator material is mainly PZT ceramic or composite material based on the PZT ceramic, polymer piezoelectric film, etc.
Piezoelectric composite ultrasonic transducer: a piezoelectric material formed by compounding two or more materials is generally composed of piezoelectric ceramics and a high molecular polymer as a transducer of a piezoelectric vibrator.
Laminated bending vibration piezoelectric ultrasonic transducer: the multilayer structure is adopted, the bending vibration of the whole transducer is used for radiating sound waves, and the working frequency is low and is generally lower than 70 kHz.
Laminated bending vibration piezoelectric ultrasonic transducer: the radial vibration of the piezoelectric circular tube is used for radiating sound waves, so that the emission area of the sound waves is greatly increased. However, the emitted sound field is circumferential, and in order to convert the sound field into axial direction, an umbrella-shaped sound returning cover with a bevel edge forming an angle of 45 degrees with the axial line needs to be coaxially installed with the circular tube.
The application of the air-medium ultrasonic transducer is less, the traditional air-medium ultrasonic transducer has the problems of low sensitivity and low emission efficiency, and the using effect is not good under severe working conditions.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an air-medium ultrasonic transducer aiming at the prior art and solving the problems of low sensitivity and low emission efficiency of the existing air-medium ultrasonic transducer.
The technical scheme of the invention is as follows: the utility model provides a gas-medium ultrasonic transducer, includes the integration casing, be equipped with heater strip, tubular metal resonator, earth connection, anodal wire, negative pole wire in the integration casing, the earth connection with the tubular metal resonator is connected, wear to establish in the tubular metal resonator anodal wire, negative pole wire, heater strip, integration casing upper portion is equipped with back lining and piezoceramics pipe, piezoceramics pipe with the back lining is connected, be equipped with first solder joint and second solder joint on the piezoceramics pipe, first solder joint welding anodal wire, the second solder joint welding negative pole wire, anodal wire, negative pole wire are connected ultrasonic drive power.
Preferably, the heating wires include a first heating wire and a second heating wire, which are spirally wound around the positive electrode wire and the negative electrode wire.
Preferably, the first heating wire and the second heating wire have opposite spiral directions and the spiral pitches are the same.
Preferably, the backing surface is rubberized for absorbing residual vibration.
Preferably, the first welding spot and the second welding spot are respectively arranged on the inner wall and the outer wall of the piezoelectric ceramic tube.
Preferably, a waterproof membrane is arranged outside the integrated shell.
The invention has the beneficial effects that:
1. the excitation vibrator is made of piezoelectric ceramic materials and is designed into a tubular structure, the piezoelectric ceramic tube is connected with the back lining coated with soft rubber, residual vibration of the excitation vibrator can be effectively absorbed, and high sensitivity and high emission efficiency of the ultrasonic transducer are guaranteed.
2. The metal tube is connected with the grounding wire, and the heating wire is arranged in the metal tube, so that the ultrasonic transducer can be normally used under severe cold working conditions, and the dew condensation in severe cold weather is avoided.
3. The outside waterproof membrane that sets up of integration casing avoids the casing inside to intake, causes the damage to the transducer, has prolonged ultrasonic transducer's life.
Drawings
FIG. 1 is a schematic diagram of an overall structure of an air-medium ultrasonic transducer according to the present invention;
fig. 2 is a schematic diagram of an internal structure of an integrated housing of an air-interface ultrasonic transducer according to the present invention.
Reference numbers in the figures: 1. an integrated housing; 2. a backing; 3. a positive electrode lead; 4. a negative electrode lead; 5. a ground line; 6. a first heater wire; 7. a second heating wire; 8. a piezoelectric ceramic tube; 9. a first solder joint; 10. a second solder joint; 11. a metal tube; 12. the ultrasonic wave drives the power supply.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Referring to fig. 1 and 2, the present invention provides a gas-medium ultrasonic transducer, which includes an integrated housing 1, wherein a heater strip, a metal tube 11, a ground wire 5, an anode wire 3 and a cathode wire 4 are arranged in the integrated housing 1, the ground wire 5 is connected to the metal tube, the anode wire 3, the cathode wire 4 and the heater strip are arranged in the metal tube 11 in a penetrating manner, a backing 2 and a piezoelectric ceramic tube 8 are arranged at an upper portion of the integrated housing 1, the piezoelectric ceramic tube 8 is connected to the backing 2, a first welding spot 9 and a second welding spot 10 are arranged on the piezoelectric ceramic tube 8, the first welding spot 9 is used for welding the anode wire 3, the second welding spot 10 is used for welding the cathode wire 4, and the anode wire 3 and the cathode wire 4 are connected to an ultrasonic driving power supply 12.
The heating wires comprise a first heating wire 6 and a second heating wire 7, and the first heating wire 6 and the second heating wire 7 are spirally wound on the positive electrode lead 3 and the negative electrode lead 4.
The first heating wire 6 and the second heating wire 7 are opposite in spiral direction and same in spiral distance, so that the uniform heating degree is ensured, and the heating is sufficient.
The surface of the backing 2 is coated with glue for absorbing residual vibration generated by the piezoelectric ceramic tube.
The first welding spot 9 and the second welding spot 10 are respectively arranged on the inner wall and the outer wall of the piezoelectric ceramic tube 8.
The outside of integration casing 1 is equipped with the water proof membrane, avoids the inside intaking of casing, influences the result of use.
The working principle of the invention is as follows: under the action of voltage signals, the piezoelectric ceramic material of the ultrasonic transducer generates mechanical deformation, so that the shell generates bending vibration and radiates ultrasonic waves with certain frequency outwards. The excitation vibrator adopts the piezoelectric ceramic material and is designed into a tubular structure, and the piezoelectric ceramic tube 8 is connected with the back lining 2 coated with soft rubber, so that the residual vibration of the excitation vibrator can be effectively absorbed, and the high sensitivity and the higher emission efficiency of the ultrasonic transducer are ensured.
The metal tube is connected with the grounding wire, the heating wires are arranged in the metal tube and comprise a first heating wire 6 and a second heating wire 7, the spiral directions of the first heating wire 6 and the second heating wire 7 are opposite, the spiral intervals are the same, the heating range is uniform, and the ultrasonic transducer can be normally used under severe cold working conditions.
The outside waterproof membrane that sets up of integration casing avoids the casing inside to intake, causes the damage to the transducer, has prolonged ultrasonic transducer's life.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. An air-dielectric ultrasonic transducer, characterized by: comprises an integrated shell (1), wherein a heating wire, a metal pipe (11), a grounding wire (5), a positive lead (3) and a negative lead (4) are arranged in the integrated shell (1), the grounding wire (5) is connected with the metal tube (11), the positive lead (3), the negative lead (4) and the heating wire are arranged in the metal tube (11) in a penetrating way, the upper part of the integrated shell is provided with a back lining (2) and a piezoelectric ceramic tube (8), the piezoelectric ceramic tube (8) is connected with the backing (2), a first welding point (9) and a second welding point (10) are arranged on the piezoelectric ceramic tube (8), the first welding point (9) is welded with the anode lead (3), the second welding point (10) is welded with the cathode lead (4), the positive lead (3) and the negative lead (4) are connected with an ultrasonic driving power supply (12).
2. An air-borne ultrasonic transducer according to claim 1, wherein: the heating wires comprise a first heating wire (6) and a second heating wire (7), and the first heating wire (6) and the second heating wire (7) are spirally wound on the peripheries of the positive electrode lead (3) and the negative electrode lead (4).
3. An air-borne ultrasonic transducer according to claim 2, wherein: the first heating wire (6) and the second heating wire (7) are opposite in spiral direction, and the spiral intervals are the same.
4. An air-borne ultrasonic transducer according to claim 1, wherein: the surface of the back lining (2) is coated with glue for absorbing residual vibration.
5. An air-borne ultrasonic transducer according to claim 1, wherein: the first welding point (9) and the second welding point (10) are respectively arranged on the inner wall and the outer wall of the piezoelectric ceramic tube (8).
6. An air-borne ultrasonic transducer according to claim 1, wherein: and a waterproof membrane is arranged outside the integrated shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011246952.3A CN112317287A (en) | 2020-11-10 | 2020-11-10 | Air-medium ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011246952.3A CN112317287A (en) | 2020-11-10 | 2020-11-10 | Air-medium ultrasonic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112317287A true CN112317287A (en) | 2021-02-05 |
Family
ID=74318129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011246952.3A Pending CN112317287A (en) | 2020-11-10 | 2020-11-10 | Air-medium ultrasonic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112317287A (en) |
-
2020
- 2020-11-10 CN CN202011246952.3A patent/CN112317287A/en active Pending
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