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JP2006043622

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2006043622
An object of the present invention is to propagate vibration to a horn with little loss and
efficiently utilize acoustic energy radiated from the horn. SOLUTION: An area where a vibrator is
in contact with treated water is minimized, and members of various softness are combined to
form an efficient standing wave sound field. Furthermore, the area where high sound pressure is
generated is enclosed by a container with sufficient rigidity. [Selected figure] Figure 2
Ultrasonic water treatment system
[0001]
The present invention relates to a method and an apparatus for water treatment by ultrasonic
waves, and in particular, in an application field where generation of high sound pressure and
strong cavitation are required while suppressing energy consumption low, such as drinking
water and circulating baths. The present invention relates to a water treatment method and a
water treatment apparatus suitable for use in sterilization treatment of bacteria and the like.
[0002]
It is known that if ultrasonic waves are given strong water, bacteria can be killed by strong shock
waves generated during cavitation collapse as well as sonochemical oxidation.
Currently, as in the example described in Patent Document 1, a water treatment apparatus has
also been developed in which ultrasonic waves are applied to sterilization in a circulating bath.
04-05-2019
1
Further, in Patent Document 2, there is provided a water treatment apparatus which arranges the
whole of a cylinder which is coupled to a bolt-clamped Langevin type vibrator and vibrates in a
cylinder and generates cavitation in water flowing like a film on almost the entire surface of the
cylinder. It is disclosed. In addition, there is also a device that improves a sterilization effect by
ultraviolet light, ozone, photocatalyst or the like by, for example, decomposing clusters of
amoeba or bacteria by ultrasonic waves. On the other hand, ultrasound is also widely used as a
means of cleaning. In this method, dirt adhering to the surface of an object is exfoliated by the
stirring effect of water by ultrasonic waves and the weak shock wave of cavitation generated
under a relatively low acoustic pressure. In addition, ultrasound is widely applied to medical
fields such as ultrasound diagnosis. In such an ultrasonic water treatment apparatus, treatment is
carried out by immersing the resonance structure to be ultrasonically driven in the water to be
treated, or bringing the vibrator into close contact with the back surface of the tank storing
treated water to vibrate the tank inner wall itself. Ultrasonic vibration is transmitted to the water.
[0003]
JP-A-11-267640 JP-A-2001-334264
[0004]
As described above, the engineering application range of ultrasonic waves is very wide, but in
order to operate the apparatus efficiently, it is necessary to generate and use ultrasonic waves
suitable for practical purposes.
For example, the basic device structure should be different between the field such as ultrasonic
cleaning that does not require much acoustic energy density and the field such as sterilization
that requires high acoustic energy density (high cavitation strength).
[0005]
The strength of the shock wave generated at the time of cavitation collapse can be derived by
numerically solving the Rayleigh-Plesset equation. According to it, it is predicted that the impact
pressure at the time of cavitation collapses sharply when the sound pressure generated in water
by ultrasonic waves becomes about 2.5 [atm] (pp) or more, and the germicidal efficiency of
bacteria is greatly improved Be done. The sound pressure generated in water is proportional to
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2
the magnitude of the amplitude of the ultrasonic transducer if the specific acoustic impedance of
water is constant. Therefore, to obtain a larger sound pressure, the transducer should be vibrated
more largely. However, once cavitation occurs in water, the inherent acoustic impedance of water
decreases to about 1/30. Therefore, while cavitation is not occurring, the sound pressure is
greatly increased simply by vibrating the vibrator slightly, but if cavitation is generated in the
water, the sound pressure rise suddenly tends to saturate. Become. Theoretically, in order to
obtain a high sound pressure of 2.5 [atm] (pp) or more in a traveling wave sound field, an
environment of 1 atm atmospheric pressure, a vibrator of about 60 [μm] (pp) in water And have
to vibrate very large.
[0006]
It is difficult to realize high sound pressure by such a large amplitude with the conventional
device. This is because the device itself can not withstand large amplitudes, and energy
consumption is also enormous.
[0007]
In Patent Document 1 and Patent Document 2, no consideration is given to such a point. For
example, in Patent Document 2, the entire vibrating body is immersed in water, and the
vibrational energy transmitted through the vibrating body is dissipated to the case through the
water, and extra cavitation occurs in the water. It is possible that it will be a big energy loss.
[0008]
The present invention solves the above problems, can generate cavitation with less power
consumption than before, and can generate very strong cavitation when a large amount of power
is supplied. An object of the present invention is to provide a sonic water treatment apparatus.
[0009]
In order to achieve the above object, one of the features of the present invention includes a
vibrator and a vibrator having a resonant structure, and a container supporting the vibrator and
provided with a water treatment unit, the vibration A water treatment apparatus for treating a
treatment water of the water treatment unit by irradiating an ultrasonic wave generated by
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ultrasonic vibration of the body to the treated water of the water treatment unit, and a portion
serving as a node of vibration of the vibrator through the seal member While holding, the end
surface on the opposite side of the vibrator, which is the main vibrator surface of the vibrator, is
disposed in the water treatment section as a vibrator treated surface, and the side surface on the
vibrator side across the seal member of the vibrator The space between the container and the
container is a space, a gap is provided between the side surface of the vibrating body on the side
opposite to the vibrator, and the container, and the gap is communicated with the water
treatment unit.
Other features of the invention are described in the following description.
[0010]
According to the present invention, in a device for driving and controlling a resonant structure
and applying ultrasonic vibration to water to be treated to generate strong cavitation in liquid,
the vibrator is held in a container at a portion which becomes a node of vibration. The area in
which the side of the vibrator contacts water or a container is narrowed. Therefore, ultrasonic
vibration generated in the resonant structure is efficiently transmitted to the liquid to be treated,
and loss of acoustic energy radiated from the treatment surface can be reduced. Therefore, high
sound pressure and strong cavitation can be generated with less energy consumption, which is
effective for water treatment such as sterilization and washing of water.
[0011]
Hereinafter, embodiments of an ultrasonic water treatment apparatus according to the present
invention and an ultrasonic water treatment method using the same will be described in detail
with reference to the drawings.
[0012]
FIG. 1 is a system configuration diagram when ultrasonic water treatment according to one
embodiment of the present invention is applied to water circulation treatment.
In FIG. 1, 101 is an ultrasonic water treatment apparatus, 102 is an ultrasonic wave generation
unit in the apparatus, 103 is a water treatment section, 104 is a roller pump, 105 is a treated
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water tank, 106 is a treated water, 107 is a piping system , 108 is a transmitter, 109 is an
amplifier, 110 is a sliding transformer, and 111 is an electrical wiring system. The ultrasonic
water treatment apparatus 101 performs ultrasonic treatment on drinking water, hot spring
water, and the like in the water treatment unit 103 by driving the resonance structure in the
ultrasonic wave generation unit 102 and causing ultrasonic vibration.
[0013]
The water circulation system in this system, as shown by the solid line in FIG. 1, comprises the
water treatment unit 103, the roller pump 104, the treated water tank 105, and the piping
system 107 in the ultrasonic water treatment apparatus 101. 106 circulate these.
[0014]
In FIG. 1, the treated water 106 stored in the treated water tank 105 is pressurized by the roller
pump 104 and introduced into the water treatment unit 103 in the ultrasonic water treatment
apparatus 101 through the piping system 107.
Therefore, after being treated by ultrasonic wave irradiation, it is returned to the treated water
tank 105 again through the piping system 107. As a pump for water circulation, for example, a
pump other than the roller pump 104 such as a cascade pump or a spiral pump can be used, but
such a pump entraps large (in the order of mm diameter) air bubbles in the treated water 106 In
order to prevent this, it is necessary to remove air bubbles by combining a degassing device (not
shown) downstream of the pump. Such large bubbles are hereinafter referred to as coarse
bubbles. Even if the ultrasonic waves are irradiated while the coarse bubbles remain in the
treated water 106, the cavitation effective in water treatment (approximately 10 μm or less in
diameter) because the acoustic energy is preferentially consumed for the further coarsening of
the coarse bubbles Can not be done efficiently. Furthermore, the coarse bubble itself disturbs the
standing wave sound field and interferes with the resonance, so that a desired high sound
pressure can not be generated. In particular, when using a standing wave field as in the present
apparatus, it is very important to remove coarse bubbles prior to ultrasonication. In addition, it is
advantageous to generate high sound pressure if the amount of gas dissolved in water is further
reduced by a vacuum degassing device (not shown) after removing coarse bubbles by a
degassing device.
[0015]
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The electric system of the ultrasonic water treatment system according to one embodiment of the
present invention is, as indicated by a broken line in FIG. 1, an ultrasonic wave generator 102, a
transmitter 108, and an amplifier 109 in the ultrasonic water treatment apparatus 101. , And a
sliding transformer 110, and an electric wiring system 111. The ultrasonic wave generator 102
is electrically connected to the transmitter 108 via the sliding transformer 110 and the amplifier
109.
[0016]
In FIG. 1, a sine wave of a desired frequency (for example, 15 kHz) is output from the transmitter
108, amplified by the amplifier 109 in the subsequent stage, and then input to the ultrasonic
wave generation unit 102 through the sliding transformer 110. The electrical vibration input to
the vibrator of the ultrasonic wave generation unit 102 is converted into mechanical vibration,
and an ultrasonic wave is obtained by a vibrator (horn) connected to the vibrator. Impedance
matching between the power supply side (primary) and the ultrasonic water treatment apparatus
101 (secondary) is achieved by the sliding transformer.
[0017]
Next, the structure of the ultrasonic water treatment apparatus 101 according to an embodiment
of the present invention will be described in more detail using the drawings. FIG. 2 schematically
shows one of the most basic structures of the ultrasonic water treatment apparatus 101
according to an embodiment of the present invention. In FIG. 2, reference numeral 201 denotes a
bolt-clamped Langevin type vibrator, 202 denotes an electric terminal, 203 denotes an electric
terminal (earth), and 204 denotes a horn as a vibrator. Reference numeral 205 denotes a flange,
and 206 denotes a case as a container for holding the horn, both of which are made of a metal
material such as stainless steel. Reference numeral 207 denotes silicone rubber as a water
sealing member. 208 is a sponge for vibration absorption. 210 is a water flow guide pipe. A
cylindrical water inlet 211 and a cylindrical water outlet 212 are connected to the cylindrical
case 206, respectively. The water treatment unit 216 for treating water by ultrasonic irradiation
includes a sub-treatment unit 216B provided on the water inlet 211 side and a main treatment
unit 216A facing the tip of the horn 204. A cylindrical stand 219 integral with the case 206 is
provided in the sub-processing unit 216B, and a cylindrical closed-cell sponge 209 is fixed
thereon.
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[0018]
In the present invention, among the surfaces of the horn 204, the horn surface which is
perpendicular to the central axis of the apparatus and located in the processing unit 216 is the
horn treated surface (oscillator treated surface) 213 and the other surfaces of the horn 204 are
horn lateral surfaces ( Vibrator side) 214, and distinguish between the two. The inner wall of the
case 206 facing the horn processing surface 213 is particularly called a case bottom surface 215.
Further, a portion of the side of the horn opposite to the silicone rubber 207 is referred to as a
horn side support 217.
[0019]
The horn 204 of the present embodiment is cylindrical, and a radial gap of about 2 mm to 3 mm
in the vicinity of the horn treated surface 213 between the horn side surface 214 and the inner
peripheral surface of the cylindrical case 206 outside thereof. There is.
[0020]
The horn 204 is supported on the case 206 by the flange 205 at a position corresponding to a
node of vibration that does not vibrate in the axial direction.
In addition, it is necessary to hold down the horn with rubber or the like in order to seal the
water, but if the vibration of the horn is suppressed near the antinode of the vibration, the load
will of course be greatly increased. In the present invention, the horn side support portion 217
serving as a node of vibration is supported by the silicone rubber 207, and the antinode of the
vibration is used as the horn treated surface 213. Further, the end of the horn farther from the
vibrator 201, that is, the end face on the side opposite to the vibrator, is disposed in the water
treatment section 216 as the horn treated surface 213 which is the main vibrator surface,
sandwiching the sealing member (silicon rubber 207) of the horn. The space between the side
surface on the same side as the vibrator 201 and the case is a space communicating with the
atmosphere, and a gap is provided between the side surface of the portion on the side opposite to
the vibrator of the horn and the case. ing.
[0021]
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Water is introduced from the water inlet 211 and conveyed to the vicinity of the horn treated
surface through the water flow guide pipe 210. Most of the carried water flows along the horn
treatment surface due to the effect of the water flowing at high speed by the side of the horn.
The pipe 210 is made of an acoustically transparent material and made as thin as possible so as
not to disturb the standing wave sound field. For example, 0.5 mm thick acrylic resin is used.
[0022]
On the other hand, the area surrounded by the case 206, the horn 204, the flange 205 and the
silicone rubber for water sealing 207 is a space 218 of atmospheric pressure in which air exists,
and between the flange 205 and silicone rubber for water sealing 207 There is no contact with
the side of the horn 204. The case 206 is a thick high-rigidity portion in the portion constituting
the processing portion 216, while the portion constituting the outer periphery of the horn side
surface support portion 217 of the case 206 and the atmospheric pressure chamber 218 is a
thin low-rigidity portion . Although the case 206 is shown as a single structure in the
embodiment, the high rigidity portion and the low rigidity portion may be formed as two or more
separate members, and these may be integrally fixed or joined. .
[0023]
In the ultrasonic water treatment apparatus 101 according to one embodiment of the present
invention, in particular, the ultrasonic wave generation unit 102 is configured by a bolted
Langevin type vibrator 201, an electric terminal 202, and an electric terminal (earth) 203. The
electrical terminal 202 and the electrical terminal (earth) 203 are connected to the transmitter
108 via the sliding transformer 110 and the amplifier 109 as shown in FIG. 1 above.
[0024]
The ultrasonic waves generated in the ultrasonic wave generator 102 pass through a vibration
system composed of a horn 204 connected thereto, a flange 205, a case 206, a rubber seal 207
for water seal, and a sponge 208, to treat water. It is propagated to the part 103. In the horn
204, the horn treated surface 213 vibrates in the axial direction by about 30 μm due to the
vibration by the bolt-clamped Langevin type vibrator 201, and the ultrasonic wave is transmitted
to the treated water 106 in the processing unit 216.
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[0025]
In the ultrasonic water treatment apparatus 101 according to an embodiment of the present
invention, in particular, the water treatment unit 103 mainly includes a case 206, a closed-cell
sponge 209, a water flow guide pipe 210, a water introduction port 211, water It comprises the
discharge port 212 and the horn processing surface 213. The ultrasonic waves that have
propagated through the horn 204 are transmitted to the treated water 106 through the horn
treated surface 213, and strong cavitation occurs in the water, etc., to perform water treatment.
[0026]
Next, generation of ultrasonic waves in the ultrasonic wave generation unit 102 and its
propagation mechanism will be described in detail. In the ultrasonic wave generator 101
according to an embodiment of the present invention, a sine wave having a frequency near the
resonance frequency is generated by the above-described transmitter 108, amplified by the
amplifier 109, and then transformed by the sliding transformer 110. Thus, the Langevin
transducer 201 in the ultrasonic wave generator 102 electrically connected thereto is driven. The
Langevin transducer 201 vibrates at an amplitude corresponding to the drive voltage to generate
an ultrasonic wave.
[0027]
The ultrasonic vibration generated by the Langevin-type transducer 201 is propagated to the
horn processing surface 213 via each part of the horn 204. The dimensions of each part of the
horn 204 are determined based on the wavelength of the fundamental wave traveling
therethrough, and typically, the distance from the Langevin transducer 201 to the horn
treatment surface 213 is an integral multiple of the wavelength of the fundamental wave. Is
designed as. In the vibration system according to the embodiment of the present invention, the
distance from the Langevin-type transducer 201 to the horn processing surface 213 is twice the
wavelength of the fundamental wave. Further, a flange 205 is provided at a portion to be a node
of vibration, and the horn 204 is supported by fastening the flange 205 and the case 206 with a
bolt, a nut or the like. At this time, the sponge 208 or the like is sandwiched between the flange
205 and the case 206 to suppress the vibration propagation from the flange 205 to the case
206. On the other hand, in order to suppress the generation of vibration modes in the radial
direction, the diameter of the horn 204 needs to be shorter than the wavelength of the
04-05-2019
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fundamental wave. In the ultrasonic wave generator 101 according to one embodiment of the
present invention, the diameter of the horn 204 is 60 mm.
[0028]
Further, in the ultrasonic wave generator according to one embodiment of the present invention,
as shown in FIG. 2, the position at which the vibration node of the horn 204 is to be squeezed
strongly by the silicon rubber 207 for water sealing, and the treated water 106 is in the space
above it. I try not to enter. The silicone rubber for water sealing 207 is a ring shape having a
rectangular cross section, which is sandwiched by the case 206 from the upper and lower sides,
tightened with a bolt and compressed to push the silicone rubber 207 radially inward, and the
pressure at this time Thus, the silicone rubber 207 is in close contact with the side surface 214
of the horn. A commercially available sealing agent (not shown) or the like was applied to the
region of the side surface 217 of the horn opposite to the silicone rubber 207 to further improve
the adhesion between the two. Thus, by sealing the treated water 106 with the silicone rubber
207 or the like and narrowing the area where the treated water 106 contacts the flange 205 and
the horn side 214, the load is reduced and the occurrence of excess cavitation is suppressed. As a
result, it is possible to vibrate the horn processing surface 213 with high energy efficiency.
[0029]
In addition, the position of the horn 204 at the node of vibration is strongly held by the water
seal silicone rubber 207 so that the treated water 106 does not enter the space above it, so that
the vibration energy of the horn is largely dissipated. Can be reduced to When water comes in
contact with the flange part or the side of the horn, the vibration energy transmitted through the
horn is dissipated to the case through the water, and extra cavitation occurs in the water,
resulting in a large energy loss. . According to the structure of the present invention, it is possible
to reduce the loss, efficiently transmit the vibration to the treated surface of the horn tip, and
generate high-density acoustic energy in the water treatment unit.
[0030]
In the ultrasonic wave generator according to one embodiment of the present invention, the load
impedance is 200 Ω (when the power consumption is 300 W) of the conventional ratio 1/2 to
1/4 as compared with the conventional open ultrasonic wave generator developed by us. Along
with the reduction, the amplitude at the same power consumption could be improved more than
twice compared with the conventional one.
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[0031]
As shown in the embodiment of the present invention, in the vicinity of the horn where high
sound pressure is generated or the like, the reduction in sound pressure can be suppressed by
narrowing the gap between the horn and the case to 3 mm or less.
FIG. 3 is a diagram showing simulation results on the relationship between the gap between the
horn and the case and the sound pressure. This shows the sound pressure distribution in water 1
mm away from the horn treated surface in the normal direction, and the horizontal axis is the
radial distance r (mm) from the horn central axis, and the vertical axis is the value when the gap
is 1 mm. The sound pressure standardized by The size of the horn is indicated by the 1⁄4 circle
on the graph background, and the position of the case inner wall in each case is indicated by the
hatch on the right side of the graph. According to FIG. 3, when the gap is 3 mm or less, there is
no significant change in the distribution of sound pressure, and the sound pressure is maintained
almost uniformly over the entire surface of the horn. Sound pressure is decreasing around the
horn.
[0032]
As shown in FIG. 4, in the ultrasonic wave generator according to one embodiment of the present
invention, a thin layer 303 of treated water is formed between a portion 301 of the side of the
horn and a portion 302 of the case opposite thereto.
[0033]
In the area where such a thin layer 303 of treated water exists, the water may look acoustically
hard, which may impede the efficient propagation of ultrasound within the horn 204.
At this time, however, the material of the portion 302 of the case relative to the portion 301 of
the horn side is made relatively soft and its thickness is made extremely thin, so that the thin
layer 303 of the treated water and the portion 302 of the case. The whole local structure
including up to can be designed to resonate, and the vibration of the horn processing surface
213 can be performed more efficiently. Here, the thickness of the portion 302 of the case is
1/160 or less of the wavelength of the fundamental wave in the material (for example, about 2
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mm or less for stainless steel).
[0034]
Next, the structure of the water treatment unit 103 will be described in more detail using the
drawings. In the ultrasonic wave generator according to one embodiment of the present
invention, as shown in FIG. 5, the distance L1 from the horn processing surface 213 to the case
bottom surface 215 opposite thereto is an integral multiple of 1⁄4 wavelength of the
fundamental wave. In the present embodiment, it is 50 mm. This corresponds to half the
wavelength of the fundamental wave (frequency 15 kHz) in water. Further, the thickness of the
case bottom surface 215 is 20 mm or more in a thick portion, so that the horn treated surface
213 and the case bottom surface 215 act as a fixed end in the acoustic standing wave.
[0035]
As a result, as shown by the thick solid line in the graph of FIG. 5, a standing wave 401 in which
the vicinity of the horn processing surface 213 and the vicinity of the case bottom surface 215
have antinodes is formed. It can be raised. However, since the amplitude is actually attenuated
due to air bubbles or the like, the generated sound pressure P1 ′ in the vicinity of the case
bottom surface 215 is smaller than the sound pressure P1 in the vicinity of the horn processing
surface 213. In the present apparatus, a large number of harmonic components (15, 30, 45,--kHz) are generated in the liquid because of the strong ultrasonic waves. Therefore, in particular,
the distance L1 from the horn-treated surface (the surface on which most acoustic energy is
emitted) 213 to the case bottom surface 215 opposite thereto is a half wavelength of the
fundamental wave (15 kHz, wavelength λ = 100 mm) propagating in water. By setting it as an
integral multiple, an effect different from the configuration in which this is a quarter wavelength
is expected.
[0036]
That is, when the distance L1 is set to an integral multiple of a half wavelength in this manner,
sound pressures due to all harmonic components are added in the same phase in both the horn
treated surface 213 and the case bottom surface 215 opposite thereto. Standing wave sound
pressure can be increased. On the other hand, in the inner region of the water flow guide pipe
210, the distance L2 between the horn treated surface 213 and the closed air bubble sponge 209
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is designed to be 75 mm equal to 3/4 wavelength of the fundamental wave. The sponge 209 acts
approximately as the free end of the standing wave.
[0037]
Therefore, a standing wave 402 as shown by a dotted line in the graph of FIG. 5 is formed
between the horn treated surface 213 and the closed bubble sponge 209, and the generated
sound pressure in the vicinity of the horn treated surface 213 as described above. P2 goes high.
If coarse bubbles are quickly removed by using a sufficiently degassed treated water 106 or by
increasing the flow rate, cavitation will occur both in the vicinity of the horn treated surface 213
and in the vicinity of the case bottom 215.
[0038]
Further, in the ultrasonic wave generator 101 according to the embodiment of the present
invention, the gap between the outer periphery of the horn treated surface 213 having a
diameter of 60 mm and the inner wall (inner diameter 64 mm) of the case 206 surrounding it is
narrow. For example, this gap is only 2 mm. On the other hand, stainless steel is used as the
material of the case 206 surrounding the horn treated surface 213, and the thickness thereof is
further increased to 20 mm or more.
[0039]
As described above, according to this embodiment, it is possible to manufacture an ultrasonic
water treatment apparatus that generates strong cavitation with low energy by constructing an
efficient vibration system.
[0040]
As is apparent from what has already been described, it is desirable for the case to adjust its
thickness in accordance with the positional relationship with the horn.
That is, in a region where high sound pressure occurs, such as in the vicinity of the horn-treated
surface, if the material of the case is hardened, the thickness is also thickened to enhance the
04-05-2019
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rigidity, and conversely, the rigidity near the horn support is preferably relatively lowered. .
[0041]
FIG. 6 is a view showing the dependence of the sound pressure generated in water 1 mm away
from the horn on the thickness of the case surrounding the horn. The horizontal axis is the
thickness of the case (mm), and the vertical axis is the sound pressure (arbitrary unit). Here, the
sound pressure was normalized by the value when the case was assumed to be an ideal rigid
body. Further, in FIG. 6, a box shows a schematic view of a structural model used for the
calculation. The material of the case is stainless steel (SUS304). From this figure, it can be seen
that when the case material is SUS304, the generated sound pressure is weak when the thickness
of the case is 10 mm or less. In order to obtain high sound pressure with a single horn, the
thickness of the case needs to be at least 20 (mm) in practice.
[0042]
Thus, the region 206 near the horn processing surface 213 where high sound pressure is
generated by the standing wave sound field is a case 206 with sufficient rigidity having a
thickness of 1/17 or more of the wavelength of the fundamental wave in the material. By
enclosing it, high sound pressure can be generated relatively uniformly over the entire surface of
the horn treated surface 213, and in particular, energy efficiency is improved before cavitation
generation in which the intrinsic acoustic impedance of water is not decreased. Power
consumption until the occurrence of cavitation can be reduced.
[0043]
Also, as mentioned earlier, if there is a thin layer of water with a thickness of about 4 mm or less
between the horn side and the case, then the water appears acoustically hard in that part, and the
efficiency in the horn is Vibration propagation may be hindered.
In that case, as shown in FIG. 4, the material of the case adjacent to the thin water layer is made
soft, and the thickness is also made thin to reduce the rigidity, and the portion including the thin
water and the case is collectively resonated. It can be designed as a structure.
[0044]
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By satisfying the above-described features, vibration energy can be propagated to the horntreated surface with high energy efficiency, and cavitation can be generated. As an example, in
the ultrasonic wave generator 101 according to an embodiment of the present invention, the
power required for the cavitation generation is about 0.35 W / cm <2> which is 1/5 or less
compared to the open system example. I was able to reduce it.
[0045]
Next, an example of the flow of the treated water 106 in the water treatment unit 103 according
to an embodiment of the present invention will be described in detail with reference to FIGS. 7
and 8. First, FIG. 7 shows an example of the flow of treated water. The treated water 106
introduced from the water inlet 211 is conveyed near the horn treated surface 213 of the water
treatment unit 216 through the water flow guide pipe 210 as shown by the arrow 501 in FIG. 7.
Most of the transported treated water 106 flows along the horn treated surface 213 by being
pulled by the water flowing at a high speed through the horn side 214, and thus is efficiently
treated by ultrasonic waves. Air bubbles generated in the vicinity of the horn treated surface 213
are also swept away by the flow of the treated water 106, and new water always containing
many bubble nuclei is supplied to the horn treated surface 213 through the water flow guide
pipe 210. The ultrasonically treated water further flows from the water outlet 212 to an external
piping system (not shown).
[0046]
The distance between the horn treatment surface 213 and the mouth of the water flow guide
pipe 210 is mainly determined by the inner diameter of the water flow guide pipe 210. In the
ultrasonic water treatment apparatus according to the embodiment of the present invention, the
inner diameter of the water flow guide pipe 210 is 16 mm, and the distance between the horn
treated surface 213 and the mouth of the water flow guide pipe 210 is 4 mm. Further, the water
flow guide pipe 210 is made of acrylic resin and has a thickness as thin as 0.5 mm, and the
influence on the standing wave sound field is minimized.
[0047]
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Next, FIG. 8 shows another example of the flow. The treated water 106 may flow in the opposite
direction to the arrow 501 in FIG. 7 as indicated by the arrow 601 in FIG. 8. The treated water
106 introduced from the water inlet 603 flows at a high speed along the horn side 214 as shown
by the arrow 601 and is carried near the horn treated surface 213 of the water treatment section
216 and efficiently treated by ultrasonic waves. Ru. The ultrasonicated water further flows from
the water outlet 604 to an external piping system (not shown). In addition, it is preferable to
attach a thin plate member 602 or the like for guiding the water flow to the vicinity of the horn
treated surface 213 of the water treatment unit 216 so that the treated water 106 flows in the
vicinity of the horn treated surface 213 a lot.
[0048]
In addition, bacteria with damaged cell membranes may self-heal over time by the treatment
method of the present invention, but this configuration applies chlorine, photocatalyst, ozone,
and ultraviolet light to liquids such as drinking water and hot spring water (Fig. By combining
(not shown), the bactericidal effect can be dramatically increased.
[0049]
As described above, the present invention has the following features.
First, while holding the portion that becomes the node of vibration of the vibrator on the
container through the seal member, the area where the vibrator is in contact with the treated
water is minimized, and members of various softness are combined to be efficient Form a
standing wave sound field. Furthermore, the area where high sound pressure is generated is
enclosed by a container with sufficient rigidity.
[0050]
According to the present invention, compared to the conventional ultrasonic wave generator, the
load impedance can be 1⁄2 to 1⁄4, and the amplitude at the same power consumption can be
doubled or more. As a result, the power consumption until the occurrence of cavitation is
reduced to 1/5, and strong cavitation can be caused by supplying a large amount of power.
[0051]
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The present invention also has the following features. (1) A sound is obtained by combining the
area made of an acoustically hard material and the area made of an acoustically soft material
according to the wavelength of the ultrasonic wave, by providing the case bottom facing the horn
treated surface of the water treatment unit. The pressure spatial distribution is made uniform. (2)
In the mechanism for driving and controlling the resonance structure and applying ultrasonic
vibration to the water to be treated to generate strong cavitation in the liquid, the flange portion
supporting the vibrator and the side surface of the vibrator should be treated It has a structure in
which the contact area with water and the like is reduced, whereby the acoustic energy emitted
from the horn can be efficiently used. (3) In the mechanism that drives and controls the
resonance structure and applies ultrasonic vibration to the water to be treated to generate strong
cavitation in the liquid, the distance from the horn-treated surface of the water treatment unit to
the bottom of the case facing this Is an integral multiple of the half wavelength of the
fundamental wave transmitted in water, and has a structure to increase the rigidity of the
container surrounding the high sound pressure generating portion, whereby the acoustic energy
emitted from the horn is Can be used efficiently.
[0052]
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a configuration of an ultrasonic water
treatment system according to an embodiment of the present invention. The figure which shows
the structure of the ultrasonic water treatment apparatus by one Embodiment of this invention.
The figure which shows the simulation result about the relationship between the clearance gap
between a horn and a case, and a sound box. In the ultrasonic water treatment apparatus
according to one embodiment of the present invention, there is a region where a thin layer of
treated water is partially formed between the horn side surface and the case, and in such a
situation, the rigidity of the corresponding case portion is reduced. Diagram showing that it is
effective. The figure which shows that the vicinity of a horn process surface and the case bottom
face become high sound pressure by an ultrasonic standing wave. The figure which showed the
dependence of the sound pressure which generate | occur | produces in the water 1 mm away
from a horn with respect to the thickness of the case which encloses a horn. The ultrasonic water
treatment apparatus by one Embodiment of this invention WHEREIN: The figure which shows an
example of the flow of treated water. The figure which shows the other example of the flow of
treated water in the ultrasonic water treatment apparatus by one Embodiment of this invention.
Explanation of sign
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[0053]
101 .. Ultrasonic water treatment apparatus, 102 .. Ultrasonic generation unit, 103 .. Water
treatment unit, 104 .. Roller pump, 105 .. Treated water tank, 106 .. Treated water, 107 .. Piping
system, 108 .. Transmitter, 109 .. Amplifier 110 .. Sliding transformer, 111 .. Electrical wiring
system 201 .. Bolt tightening Langevin vibrator, 202 .. Electrical terminal, 203 .. Electrical
terminal (earth), 204 .. Horn, 205 .. Flange, 206 .. Case, 207. Water seal For silicone rubber, 208
.. sponge, 209. independent bubble, 210 .. water flow guide pipe, 211 .. water inlet, 212 .. water
outlet, 213 .. horn treated surface, 214 .. horn side, 215 .. case bottom, 301 .. part of horn side,
302 .. part of case, 303 .. thin film of treated water, 401 .. standing wave (outside of pipe), 402 ..
standing Wave (inside of pipe), 501 .. treated water flow, 601 .. treated water flow, 602 .. thin
plate for water flow guide, 603 .. water inlet, 604 .. water outlet.
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