CN110589929A - Self-powered omnibearing integrated ultrasonic algae removal device and working method thereof - Google Patents
Self-powered omnibearing integrated ultrasonic algae removal device and working method thereof Download PDFInfo
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- CN110589929A CN110589929A CN201910965842.3A CN201910965842A CN110589929A CN 110589929 A CN110589929 A CN 110589929A CN 201910965842 A CN201910965842 A CN 201910965842A CN 110589929 A CN110589929 A CN 110589929A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
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Abstract
The invention discloses a self-powered omnibearing integrated ultrasonic algae removal device and a working method thereof, wherein the self-powered omnibearing integrated ultrasonic algae removal device comprises a solar power supply drive control integrated module, a bearing device, a connecting device, an ultrasonic probe module and a water quality detection device; the power supply and drive integrated module consists of a photovoltaic power generation system, a polygonal conical shell with an inner cavity, an ultrasonic probe drive system and a power storage device, wherein the ultrasonic probe module consists of a box body, a variable-section Langervin piezoelectric transducer and an annular component; the variable cross-section Langevin piezoelectric transducer comprises a flange plate, a transmitting end, a balancing weight, a pre-tightening bolt and four round piezoelectric ceramic plates with central round holes. The solar energy daytime power generation is input into the driving system and the power storage system, so that the omnibearing ultrasonic algae removal function of the device is realized. The device provided by the invention is based on recyclable energy, and has the advantages of green algae removal, no pollution, wide radiation range, good algae removal effect and the like.
Description
Technical Field
The invention belongs to the technical field of ecological algae removal, and particularly relates to a self-powered omnibearing integrated ultrasonic algae removal device and a working method thereof.
Background
The water eutrophication phenomenon causes that aquatic plants and phytoplankton in slow-flow water bodies such as lakes, ponds, reservoirs and the like are rapidly propagated by using nutrient substances in water, so that the dissolved oxygen content in the water is reduced, the water quality is deteriorated, the oxygen content in the water is reduced, and aquatic organisms and even other organisms die, thereby affecting the water ecological system. The pollution-free method is adopted to inhibit the eutrophication of the water body, and has important significance for treating the water body pollution. At present, a plurality of international institutions or biological laboratories have proved through relevant experiments that the growth and propagation of algae in water bodies can be inhibited by using an ultrasonic technology, so that the water bloom phenomenon is changed, and the water bodies are cleaned and decontaminated. Some foreign enterprises have developed ultrasonic equipment for controlling growth and reproduction of algae and have been commercialized. For large-area lakes or reservoirs, a plurality of ultrasonic generators are required to inhibit the growth of blue-green algae on the whole water surface. Therefore, if a self-powered ultrasonic generating device can be realized, the device has important significance for inhibiting algae in the water body for a long time. The Dutch LG Sonic company develops an ultrasonic algae removal device which can cover the range of 500 meters in diameter and is based on solar power supply, the ultrasonic algae removal device comprises three ultrasonic probes to realize sound field radiation in a water area, each transducer needs to bear a 120-degree ultrasonic radiation task, and certain dead angles exist in the traditional ultrasonic probes inevitably, and sound waves cannot be radiated in all directions to perform algae removal operation. In addition to the nonlinear and attenuation characteristics of ultrasonic wave propagation in water, the theoretical radiation angle of ultrasonic waves in the water area is seriously attenuated along with the expansion of the water body range.
In order to realize omnibearing large-area algae removal and prevent the device from being too complex, the invention provides a self-powered scheme of solar power generation and electricity storage to supply power to a probe which radiates ultrasonic waves in 360 degrees in an omnibearing way, realize omnibearing and all-weather efficient ultrasonic algae removal, and avoid the problems that the algae removal is incomplete due to radiation dead angles in the algae removal operation and the ultrasonic algae removal effect is influenced by the occurrence of power failure or no-power supply at night.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a self-powered omnibearing integrated ultrasonic algae removal device and a working method thereof, and aims to solve the problems that the traditional ultrasonic algae removal device in the prior art is single in radiation direction and dead angles exist in a radiation range.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention discloses a self-powered omnibearing integrated ultrasonic algae removal device, which comprises: the solar energy power supply drive control integrated module, the bearing device, the connecting device, the ultrasonic probe module and the water quality detection device;
the solar power supply drive control integrated module comprises a photovoltaic power generation system, a polygonal conical shell with an inner cavity, an ultrasonic generator and an electricity storage device;
the photovoltaic power generation system is arranged on the surface of the polygonal conical shell and used for absorbing solar energy at different angles, so that the solar energy is converted into electric energy to be stored in the electricity storage device;
the power storage device supplies power to the solar power supply driving integrated module, the ultrasonic probe module and the water quality detection device uninterruptedly; the ultrasonic generator realizes the drive control of the ultrasonic probe module;
the ultrasonic generator and the power storage device are arranged in the cavity of the polygonal conical shell;
the bearing device comprises: the floating box, the annular frame and the supporting beam;
two ends of the supporting beam are respectively connected with the inner side of the annular frame and the cylindrical surface of the connecting device; the buoyancy tank is fixed on the upper surface of the support beam;
the ultrasonic probe module includes: the four variable-section Langevin piezoelectric transducers are connected through the annular member, and the box body and the four variable-section Langevin piezoelectric transducers are fixed through a flange plate;
the variable cross-section langevin piezoelectric transducer includes: the device comprises a flange plate, a transmitting end, a balancing weight, a pre-tightening bolt, four round piezoelectric ceramic plates with central round holes and a plane beam; the balancing weight, the plane beam, the circular piezoelectric ceramic piece with the central round hole and the transmitting end are sequentially installed together through a pre-tightening bolt.
Furthermore, the water quality detection device monitors parameters such as chlorophyll-a, phycocyanin content and PH value in water in real time and feeds results back to the ultrasonic generator, and the ultrasonic generator adjusts the algae removal frequency and output power in real time according to the parameter results, so that efficient algae removal is realized.
Furthermore, the flange plate is positioned between the second rectangular piezoelectric ceramic piece with the central circular hole and the third rectangular piezoelectric ceramic piece with the central circular hole and used for fixing the relative position of the variable-section Langevin piezoelectric transducer in the box body.
Further, the transmitting end is designed into a horn-shaped section amplifying structure and is provided with an inner cavity.
Further, the circular piezoelectric ceramic plate with the central circular hole is polarized along the thickness direction.
Further, the polarization directions of the two adjacent rectangular piezoelectric ceramic pieces with the central circular holes are opposite.
Further, the flange is located at a vibration node of the ultrasonic probe module.
Further, the power and working frequency transmitted by the ultrasonic probe module are respectively related to the algae removal range to be covered and the corresponding algae removal category.
Furthermore, four variable cross-section langevin piezoelectric transducers form four reinforced radiation areas in the direction of the emitting surface, meanwhile, the annular component forms a weak radiation area in the circumferential direction, the floating box is matched to control the whole algae removal device to float upwards and submerge downwards, and all-dimensional 360-degree ultrasonic algae removal is achieved.
Furthermore, the piezoelectric ceramic plates with the central circular holes are longitudinal vibration piezoelectric ceramic plates.
Further, the surface of the piezoelectric ceramic is coated with epoxy resin for insulation treatment.
Furthermore, the box body is filled with the ultrasonic couplant, so that the reflection of ultrasonic waves is avoided, and the whole body is integrated into the ultrasonic probe module.
In the device, the photovoltaic power generation system receives solar radiation, converts solar energy into electric energy and stores the electric energy in the electricity storage device; the electricity storage device supplies electric energy to the ultrasonic generator, the ultrasonic probe module and the water quality detection device; the water quality detection device monitors parameters such as chlorophyll-a, phycocyanin content and pH value in water in real time and feeds back results to the ultrasonic generator, and the ultrasonic generator adjusts the algae removal frequency and output power in real time according to the results to change the working frequency of the ultrasonic probe; the bearing device is fixedly connected with the solar drive integrated module, the ultrasonic probe module and the water quality detection device through the connecting device, and the buoyancy is changed so as to change the relative position of the whole algae removal device on the water surface.
The device generates electricity by depending on solar energy in the daytime through the photovoltaic power generation system and stores the electricity into the electricity storage device; the all-weather real-time power supply of the algae removal device is realized.
The invention relates to a working method of a self-powered omnibearing integrated ultrasonic algae removal device, which is based on the device and comprises the following steps:
single standing wave radiation: the four circular piezoelectric ceramic plates receive electric signals to excite the variable-section Langevin piezoelectric transducer to generate a 2m + 1-order longitudinal vibration mode and emit ultrasonic waves along the longitudinal vibration wave direction so as to inhibit the growth of algae, wherein m is more than or equal to 0 and is an integer; when the four variable-section Langevin piezoelectric transducers are excited simultaneously, the four variable-section Langevin piezoelectric transducers simultaneously and longitudinally vibrate to excite a bending vibration mode with n wave crests and wave troughs which are presented together on the annular member, so that the radial 360-degree radiation ultrasonic wave of the annular member inhibits the growth of algae, wherein n is more than or equal to 4, and the four variable-section Langevin piezoelectric transducers are simultaneously positioned at the wave crests or the wave troughs of the annular member.
The invention relates to a working method of a patch type self-powered omnibearing ultrasonic radiation algae removal device, which is based on the device and comprises the following steps:
standing wave and traveling wave cooperative radiation: dividing four variable cross-section Langervin piezoelectric transducers into two groups by taking two nonadjacent variable cross-section Langervin piezoelectric transducers as a group, respectively applying two electric signals with 90-degree phase difference to the two groups, and exciting the two groups of variable cross-section Langervin piezoelectric transducers to generate a 2m + 1-order longitudinal vibration mode with 90-degree time phase difference to emit ultrasonic waves along the longitudinal vibration wave direction, wherein m is more than or equal to 0 and is an integer; enabling the annular component to present two same-row n-order in-plane bending vibration modes in the circumferential direction, wherein n is more than or equal to 2; when the contact position of the first group of Langevin piezoelectric transducers and the annular member is positioned at the wave crest or the wave trough of the bending vibration mode in the upper surface of the annular member, the contact position of the other group of Langevin piezoelectric transducers and the annular member is positioned at the node position of the bending vibration mode in the upper surface of the annular member, and the two same-shaped n-order in-plane bending vibration modes on the annular member have a phase difference of pi/2 in space; the excitation frequencies of longitudinal vibration generated by the four variable-section Langevin piezoelectric transducers are ensured to be consistent, two phases of isomorphic n-order in-plane bending vibration modes with pi/2 phase difference in space and time are coupled on the annular member to form n-order bending traveling waves advancing along the circumferential direction, and therefore the ultrasonic waves are radiated along the radial direction of the annular member for 360 degrees to inhibit the growth of algae.
The invention has the beneficial effects that:
the device is divided into two working modes through the cooperation of longitudinal vibration and in-plane bending vibration, and a working mode I of generating single standing wave radiation and a working mode II of generating standing wave and annular traveling wave cooperative radiation through two different power-up modes. The first working mode adopts single-phase electric drive to realize omnibearing ultrasonic radiation algae removal, and most working conditions are met; and the second working mode adopts a two-phase electric driving mode, and the circumferential movement of the bending vibration mode on the annular member is realized by utilizing the traveling wave characteristic, so that the algae removal and water purification functions with higher requirements are realized.
The invention controls the coverage range of ultrasonic radiation generated by the ultrasonic probe, can effectively inhibit the growth and the propagation of blue algae, and simultaneously reduces the energy consumption. In addition, the energy storage device is utilized, the pollution-free solar energy is fully utilized to realize all-weather power generation to supply power to the ultrasonic probe, and the electric energy converted by the solar energy is effectively utilized to realize all-weather power supply while the electric energy waste in daytime is avoided.
The device has the advantages of simple structure, high integration level, simple control system, good algae removal effect, convenience in mounting and dismounting, good controllability and the like.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Fig. 2 is a schematic structural diagram of a power supply driving integrated module.
Fig. 3 is a half sectional view of the power supply drive integrated module.
Fig. 4 is a schematic structural diagram of the carrying device.
Fig. 5 is a schematic structural diagram of an ultrasound probe module.
Fig. 6 is a cross-sectional view of an ultrasound probe module in the Z-direction.
Fig. 7 is a schematic diagram of a single variable cross-section langevin piezoelectric transducer.
Fig. 8 is a schematic structural view of the flange.
Fig. 9 is a layout view of the piezoelectric ceramic sheet.
Fig. 10 is a schematic structural diagram of polarization of two adjacent piezoelectric ceramic sheets.
Fig. 11 is a schematic view of the vibration mode of the annular member when the variable cross-section langevin piezoelectric transducer is longitudinally vibrated.
FIG. 12 is a schematic diagram of two homomorphic fourth-order in-plane bending vibrations coupled into a traveling wave on a ring-shaped member.
Figure 13 is a schematic representation of ultrasonic radiation during operation of the device of the present invention.
Wherein: 1-solar power supply drive control integrated module, 11-photovoltaic power generation system, 12-polygonal conical shell with inner cavity, 13-ultrasonic generator, 14-electricity storage device, 2-bearing device, 21-floating box, 22-annular frame, 23-supporting beam, 4-ultrasonic probe module, 41-box body, 42-variable cross section Langevin piezoelectric transducer, 43-annular component, 44-flange plate, 45-transmitting end, 46-counterweight, 47-pretightening bolt, 48-piezoelectric ceramic plate, 49-plane beam, 40-ultrasonic coupling agent, 5-water quality detection device, 6-sin signal excitation longitudinal vibration mode on the variable cross section Langevin piezoelectric transducer, 7-cos signal excitation longitudinal vibration mode on the variable cross section Langevin piezoelectric transducer, and the corresponding in-plane bending vibration mode on the annular component is excited by the 8-sin signal, and the corresponding in-plane bending vibration mode on the annular component is excited by the 9-cos signal.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Referring to fig. 1 to 13, a self-powered omni-directional integrated ultrasonic algae removal device according to the present invention comprises: the system comprises a solar power supply drive control integrated module 1, a bearing device 2, a connecting device 3 and an ultrasonic probe module 4;
as shown in fig. 2, the solar power supply, drive and control integrated module 1 comprises a photovoltaic power generation system 11, a polygonal conical shell 12 with an inner cavity, an ultrasonic generator 13 and an electricity storage device 14;
the photovoltaic power generation system 11 is arranged on the surface of the polygonal conical shell 12 and is used for absorbing solar energy at different angles, so that the solar energy is converted into electric energy to be stored in the electric energy storage device 14;
the power storage device 14 supplies power to the whole solar power supply driving integrated module 1, the ultrasonic probe module 4 and the water quality detection device 5 uninterruptedly; the ultrasonic generator 13 realizes the drive control of the ultrasonic probe module 4;
the ultrasonic generator 13 and the electricity storage device 14 are arranged inside the cavity of the polygonal conical shell 12;
the carrier 2 comprises: a buoyancy tank 21, an annular frame 22, and a support beam 23;
two ends of the supporting beam 23 are respectively connected with the inner side of the annular frame 22 and the cylindrical surface of the connecting device 3; the buoyancy tank 21 is fixed on the upper surface of the support beam 23;
the ultrasonic probe module 4 includes: the device comprises a box body 41, four variable-section Langerhan piezoelectric transducers 42 and an annular member 43, wherein the four variable-section Langerhan piezoelectric transducers 42 are connected through the annular member 43, and the box body 41 and the four variable-section Langerhan piezoelectric transducers 42 are fixed through a flange plate 44;
the variable cross-section langevin piezoelectric transducer 42 includes: the device comprises a flange plate 44, a transmitting end 45, a balancing weight 46, a pre-tightening bolt 47 and four round piezoelectric ceramic plates 48 with central round holes; the balancing weight 46, the plane beam 49, the round piezoelectric ceramic piece 48 with the central round hole and the transmitting end 45 are sequentially arranged together through a pre-tightening bolt 47.
The device further comprises: and the water quality detection device 5 is positioned at the bottom of the ultrasonic probe module 4, monitors parameters such as chlorophyll-a, phycocyanin content and pH value in water in real time, feeds back the result to the ultrasonic generator 13, and the ultrasonic generator 13 adjusts the algae removal frequency and output power in real time according to the result to realize efficient algae removal.
The flange plate 44 is positioned between a second rectangular piezoelectric ceramic piece 48 with a central circular hole and a third rectangular piezoelectric ceramic piece 48 with a central circular hole, and is used for fixing the relative position of the variable-section Langevin piezoelectric transducer 42 in the box body 41;
the transmitting end 45 is designed into a horn-shaped cross section amplifying structure and is provided with an inner cavity;
the circular piezoelectric ceramic sheet 48 with the central circular hole is polarized along the thickness direction;
the polarization directions of the two adjacent rectangular piezoelectric ceramic pieces 48 with the central circular holes are opposite;
the flange 44 is located at the vibration node of the ultrasound probe module 4.
Wherein, the power and working frequency transmitted by the ultrasonic probe module 4 are respectively related to the algae removal range to be covered and the corresponding algae removal category.
The four variable cross-section Langevin piezoelectric transducers 42 form four reinforced radiation areas in the direction of the emitting surface, meanwhile, the annular member 43 forms a weak radiation area in the circumferential direction, and the floating box 21 is matched to control the whole algae removal device to float upwards and submerge downwards, so that the all-dimensional 360-degree ultrasonic algae removal is realized.
The piezoelectric ceramic pieces 48 with the central circular holes are longitudinal vibration piezoelectric ceramic pieces.
Wherein, the surface of the piezoelectric ceramic 48 is coated with epoxy resin for insulation treatment; the tank 41 is filled with the ultrasonic couplant 40, which both avoids reflection of ultrasonic waves and integrates the whole into the ultrasonic probe module 4.
The device generates electricity by relying on solar energy in the daytime through the photovoltaic power generation system 11 and stores the electricity into the electricity storage device; the all-weather real-time power supply of the algae removal device is realized.
The working method of the self-powered omni-directional integrated ultrasonic algae removal device of the invention is described by taking first-order longitudinal vibration and fourth-order flexural vibration as examples with reference to fig. 11 and fig. 12.
The first mode is shown in fig. 11, when four variable-section langevin piezoelectric transducers are excited to generate, the four variable-section langevin piezoelectric transducers simultaneously generate first-order longitudinal vibration and excite a bending vibration mode with 4 wave crests and wave troughs on the annular member, so that the ultrasonic waves are radiated along the radial direction of the annular member for 360 degrees to inhibit the growth of algae.
The second working mode is as shown in fig. 12, two non-adjacent variable-section langevin piezoelectric transducers are used as a group, four variable-section langevin piezoelectric transducers are divided into two groups, two electric signals with 90-degree phase difference are respectively applied to the two groups, and the two groups of variable-section langevin piezoelectric transducers are excited to generate a first-order longitudinal vibration mode with 90-degree time phase difference to emit ultrasonic waves along the longitudinal vibration wave direction; the annular member is enabled to present two in-line four-order in-plane bending vibration modes around the circumferential direction, wherein when the contact position of the first group of variable cross-section Langervin piezoelectric transducers and the annular member is located at the wave crest or the wave trough of the in-plane bending vibration mode on the annular member, the contact position of the other group of variable cross-section Langervin piezoelectric transducers and the annular member is located at the node position of the in-plane bending vibration mode on the annular member; therefore, two homomorphic four-order in-plane bending vibration modes on the annular member have a phase difference of pi/2 in space; the excitation frequencies of longitudinal vibration generated by the four variable-section Langevin piezoelectric transducers are ensured to be consistent, two phases of homomorphic four-order in-plane bending vibration modes with pi/2 phase difference in space and time are coupled on the annular member to form a four-order bending traveling wave which advances along the circumferential direction, and therefore the ultrasonic waves are radiated along the radial direction of the annular member for 360 degrees to inhibit the growth of algae.
Referring to fig. 13, since the radiation distance of the longitudinal vibration wave is greater than that of the flexural vibration wave, the radiation directions of the four longitudinal vibration waves are called strong radiation regions, and the other directions on the annular member are called weak radiation regions, and the two working regions work cooperatively to realize omnidirectional high-efficiency algae removal.
The device can control an annular water area with the radius of the ultrasonic radiation distance emitted by the single variable-section Langevin piezoelectric transducer, and assists the ultrasonic radiation of the annular member to truly achieve the all-round inhibition of the growth and the propagation of blue algae, thereby achieving the function of efficiently and cleanly removing algae.
By controlling the buoyancy of the bearing device, the ultrasonic probe can float up and down under the water surface, can realize ultrasonic coverage on a water area with a certain depth, and has a better algae removal effect.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a self-powered all-round integrated form supersound removes algae device which characterized in that includes: the device comprises a solar power supply drive control integrated module (1), a bearing device (2), a connecting device (3), an ultrasonic probe module (4) and a water quality detection device (5);
the solar power supply, drive and control integrated module (1) comprises a photovoltaic power generation system (11), a polygonal conical shell (12) with an inner cavity, an ultrasonic generator (13) and an electricity storage device (14);
the photovoltaic power generation system (11) is arranged on the surface of the polygonal conical shell (12) and is used for absorbing solar energy at different angles, so that the solar energy is converted into electric energy to be stored in the electricity storage device (14);
the power storage device (14) supplies power to the solar power supply driving integrated module (1), the ultrasonic probe module (4) and the water quality detection device (5) uninterruptedly; the ultrasonic generator (13) realizes the drive control of the ultrasonic probe module (4);
the ultrasonic generator (13) and the electricity storage device (14) are arranged in the cavity of the polygonal conical shell (12);
the carrier device (2) comprises: a buoyancy tank (21), an annular frame (22) and a support beam (23);
the connecting device (3) is arranged between the bearing device (2) and the ultrasonic probe module (4) and provides buoyancy for the ultrasonic probe module (4);
two ends of the supporting beam (23) are respectively connected with the inner side of the annular frame (22) and the cylindrical surface of the connecting device (3); the buoyancy tank (21) is fixed on the upper surface of the support beam (23);
the ultrasound probe module (4) comprises: the piezoelectric transducer comprises a box body (41), four variable-section Langevin piezoelectric transducers (42) and an annular component (43), wherein the four variable-section Langevin piezoelectric transducers (42) are connected through the annular component (43), and the box body (41) and the four variable-section Langevin piezoelectric transducers (42) are fixed through flange plates (44);
the variable cross-section langevin piezoelectric transducer (42) includes: the device comprises a flange (44), a transmitting end (45), a balancing weight (46), a pre-tightening bolt (47), four round piezoelectric ceramic plates (48) with central round holes and a plane beam (49); sequentially mounting a balancing weight (46), a plane beam (49), a round piezoelectric ceramic piece (48) with a central round hole and a transmitting end (45) together through a pre-tightening bolt (47);
the water quality detection device (5) is arranged at the bottom of the ultrasonic probe module (4).
2. The self-powered omnibearing integrated ultrasonic algae removal device according to claim 1, wherein the water quality detection device (5) monitors the chlorophyll-a, phycocyanin content and pH value in water in real time and feeds the results back to the ultrasonic generator (13), and the ultrasonic generator (13) adjusts the algae removal frequency and output power in real time according to the results to realize efficient algae removal.
3. The self-powered omni-directional integrated ultrasonic algae removal device according to claim 1, wherein the flange (44) is located between a second rectangular piezoceramic sheet (48) with a central circular hole and a third rectangular piezoceramic sheet (48) with a central circular hole, for fixing the relative position of the variable-section langevin piezoelectric transducer (42) in the tank (41);
the transmitting end (45) is designed into a horn-shaped variable cross section amplifying structure and is provided with an inner cavity;
the circular piezoelectric ceramic piece (48) with the central circular hole is polarized along the thickness direction;
the polarization directions of the two adjacent rectangular piezoelectric ceramic pieces (48) with the central circular holes are opposite;
the flange plate (44) is positioned at the vibration node position of the ultrasonic probe module (4).
4. Self-powered omni-directional integrated ultrasonic algae removal apparatus according to claim 1, wherein the power emitted by the ultrasonic probe module (4) and the working frequency are related to the algae removal range to be covered and the corresponding algae removal category, respectively.
5. The self-powered omnibearing integrated ultrasonic algae removal device according to claim 1, wherein the four variable cross-section Langevin piezoelectric transducers (42) form four reinforced radiation areas in the direction of the emitting surface, meanwhile, the annular member (43) forms a weak radiation area in the circumferential direction, and the buoyancy tank (21) is matched to control the whole algae removal device to float upwards and submerge downwards, so that omnibearing 360-degree ultrasonic algae removal is realized.
6. The self-powered omni-directional integrated ultrasonic algae removal device according to claim 1, wherein the piezoelectric ceramic plates (48) with the central circular holes are longitudinal vibration piezoelectric ceramic plates.
7. The self-powered omni-directional integrated ultrasonic algae removal apparatus according to claim 1, wherein the piezoelectric ceramic (48) is coated with epoxy resin for insulation treatment.
8. A working method of a self-powered omnibearing integrated ultrasonic algae removal device is based on the device of any one of claims 1 to 7, and is characterized by comprising the following steps:
single standing wave radiation: the four circular piezoelectric ceramic plates receive electric signals to excite the variable-section Langevin piezoelectric transducer to generate a 2m + 1-order longitudinal vibration mode and emit ultrasonic waves along the longitudinal vibration wave direction so as to inhibit the growth of algae, wherein m is more than or equal to 0 and is an integer; when the four variable-section Langevin piezoelectric transducers are excited simultaneously, the four variable-section Langevin piezoelectric transducers simultaneously and longitudinally vibrate to excite a bending vibration mode with n wave crests and wave troughs which are presented together on the annular member, so that the radial 360-degree radiation ultrasonic wave of the annular member inhibits the growth of algae, wherein n is more than or equal to 4, and the four variable-section Langevin piezoelectric transducers are simultaneously positioned at the wave crests or the wave troughs of the annular member.
9. A working method of a self-powered omnibearing integrated ultrasonic algae removal device is based on the device of any one of claims 1 to 7, and is characterized by comprising the following steps:
standing wave and traveling wave cooperative radiation: dividing four variable cross-section Langervin piezoelectric transducers into two groups by taking two nonadjacent variable cross-section Langervin piezoelectric transducers as a group, respectively applying two electric signals with 90-degree phase difference to the two groups, and exciting the two groups of variable cross-section Langervin piezoelectric transducers to generate a 2m + 1-order longitudinal vibration mode with 90-degree time phase difference to emit ultrasonic waves along the longitudinal vibration wave direction, wherein m is more than or equal to 0 and is an integer; enabling the annular component to present two same-row n-order in-plane bending vibration modes in the circumferential direction, wherein n is more than or equal to 2; when the contact position of the first group of Langevin piezoelectric transducers and the annular member is positioned at the wave crest or the wave trough of the bending vibration mode in the upper surface of the annular member, the contact position of the other group of Langevin piezoelectric transducers and the annular member is positioned at the node position of the bending vibration mode in the upper surface of the annular member, and the two same-shaped n-order in-plane bending vibration modes on the annular member have a phase difference of pi/2 in space; the excitation frequencies of longitudinal vibration generated by the four variable-section Langevin piezoelectric transducers are ensured to be consistent, two phases of isomorphic n-order in-plane bending vibration modes with pi/2 phase difference in space and time are coupled on the annular member to form n-order bending traveling waves advancing along the circumferential direction, and therefore the ultrasonic waves are radiated along the radial direction of the annular member for 360 degrees to inhibit the growth of algae.
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| CN111056590A (en) * | 2020-01-09 | 2020-04-24 | 南京航空航天大学 | Omnibearing ultrasonic algae removal device and method powered by Stirling engine |
| CN111099693A (en) * | 2020-01-09 | 2020-05-05 | 南京航空航天大学 | Tap water ultrasonic dechlorination device and working method thereof |
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| CN111099693B (en) * | 2020-01-09 | 2023-12-29 | 南京航空航天大学 | Ultrasonic tap water chlorine removal device and working method thereof |
| CN111056590B (en) * | 2020-01-09 | 2024-01-30 | 南京航空航天大学 | Omnibearing ultrasonic algae removal device and method powered by Stirling engine |
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