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JPH10200978

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10200978
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flextensional type underwater transducer used in water, and more particularly to an apparatus
for improving the transmission efficiency of vibration between a container and a drive unit.
[0002]
2. Description of the Related Art FIG. 6 is a plan sectional view of a conventional underwater
transducer. In the figure, 1 is an elliptical shell which is a container, and 2 is a drive part which
consists of a coil and a drive material. The drive unit 2 is mounted in the elliptical shell 1 so as to
contact the inner surface of the elliptical shell 1 via spacers 3 at both ends. The drive unit 2 is
attached in the long axis direction of the elliptical shell 1. In addition, the semicircular portion of
the spacer 3 is in contact with the inner surface of the elliptical shell 1. Here, the drive unit 2 is
given a desired prestress. Although not shown here, the opening of the elliptical shell 1 is closed
with a lid, and the inside of the elliptical shell 1 is sealed.
[0003]
When the above-mentioned conventional underwater transducer is put into water, the elliptical
shell 1 is deformed in the major axis direction as shown in FIG. 2 (b) from the state shown in FIG.
2 (a) by water pressure load. At this time, the movement of the contact 3a between the elliptical
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shell 1 and the spacer 3 prevents the prestress given to the drive unit 2 from being changed.
Therefore, in the conventional underwater transducer, the contact portion between the elliptical
shell 1 and the spacer 3 must be shaped so as not to change the prestress of the drive unit 2
under any water pressure load. Setting and actual processing are very difficult, and in fact, the
prestress changes and transmission of force between the drive unit 2 and the elliptical shell 1 is
not performed efficiently, and the performance as a transducer Problem of falling off. Moreover,
when incorporating the drive part 2 and the spacer 3 in the elliptical shell 1, there is a problem
that the assembly is difficult because work such as adjusting the thickness of the spacer 3 is
required so as not to change the prestress of the drive part 2 The Therefore, another
conventional underwater transducer shown in FIG. 7 has been proposed as a solution to such a
problem.
[0004]
FIG. 7 is a structural view of another conventional underwater transducer, and FIG. 5 (a) is a plan
sectional view of the whole, and FIG. 5 (b) is a plan sectional view of an essential part. In the
figure, the same components as those in the conventional example shown in FIG. Reference
numeral 5 is a transmission rod attached to both ends of the drive unit 2, 6 is a piston unit
provided to the transmission rod 5, and 7 is a through hole which is a flow space opened in the
piston unit 6. The rod 5 and the piston portion 6 are in a rigidly coupled state. An oil space 8 is a
space in which the piston 6 can move. The oil space 8 is filled with the sufficiently defoamed oil
9 and is sealed by an O-ring 5 a attached to the transmission rod 5. The through hole 7 is a
minute flow space in which the fluid can move between the spaces divided by the piston 6 in the
oil space 8 which is a space. The oil space 8 is formed by putting a lid 10 in a hole made in the
elliptical shell 1.
[0005]
Also, the volume change rates of the left and right oil spaces 8 divided by the transmission rod 5
are the same so that no stress is generated in the transmission rod 5 when the transmission rod
3 moves to the left and right in the oil space 8. Make it a shape. That is, the left and right volume
change amounts (one increases and one decreases) generated when the piston portion 5 moves
to the left and right are made to be the same.
[0006]
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In another conventional underwater transducer, when the drive unit 2 is driven by an electrical
signal, a force is transmitted to the oil 9 through the transmission rod 5 and the piston unit 6. At
this time, it can be regarded as a Helmholtz resonance system in which the oil space 8 is a cavity
(the viscoelasticity of the oil 9 in the cavity works as a stiffness) and the oil 9 in the through hole
7 is a mass. Here, the Helmholtz resonance system can be regarded as the same as a mass-spring
one-degree-of-freedom resonance system.
[0007]
As a feature of the Helmholtz resonance system, the mass in the through hole 8, here, the oil 9
can freely vibrate at a frequency before the resonance frequency, but the vibration of the mass
gradually decreases beyond the resonance frequency. The mass hardly vibrates at a frequency
sufficiently higher than the resonance frequency. Therefore, the oil 9 in the through hole 7 does
not move to the left and right when the resonance frequency is high, which is the operating band,
and the oil 9 is apparently a completely rigid body. It can be efficiently transmitted to the elliptic
shell 1 via Further, at low frequencies outside the use zone, the oil 9 moves left and right through
the through hole 7 and the force generated by the drive part 2 is moved to the elliptical shell 1
only by moving the transmission rod 5 and the piston part 6 left and right. Is not transmitted.
[0008]
However, in the conventional underwater transmitter-receiver shown in FIG. 7, the transmission
rod 5 is driven with a large amplitude when used at a high frequency of the resonance frequency
which is the use band. A negative pressure (cavitation) is generated between the oils, causing a
new problem that it is difficult to efficiently transmit the force to the elliptical shell 1.
[0009]
In the underwater transducer according to the present invention, the drive unit is movably
mounted by the mounting unit in a sealed container in a prestressed state, and the mounting unit
is mounted from the drive unit. And a space portion provided on the container side and capable
of moving the piston portion, the space portion is filled with a fluid, and the fluid is between the
spaces divided by the piston portion When the drive unit or the container vibrates in the desired
frequency range, the fluid in the flow space does not move, and the piston part and the space
part vibrate together. The vibration of either the drive unit or the container is transmitted to the
other and vibrates, and in the frequency range below that, the fluid in the flow space moves so
that either vibration is not transmitted to the other. Transducer Oite, it is provided with a fluid
pressure pressurizing means for applying pressure load on the fluid in the space in the container.
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[0010]
In the present invention, since the container of the underwater transducer is provided with the
fluid pressure pressurizing means for applying pressure load to the fluid in the space portion, the
rigidity of the rigid connection between the drive portion, the transmission rod and the piston
portion is enhanced. Alternatively, when the container vibrates in the desired frequency range,
the fluid in the flow space becomes more difficult to move, the transmission efficiency of
transmitting either vibration of the drive unit or the container to the other is improved, and
cavitation is also prevented. Ru.
[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
(Configuration) FIG. 1 is a structural view of the underwater transducer according to
Embodiment 1 of the present invention, FIG. 1 (a) is a plan sectional view of the whole, FIG. 1 (b)
is a side view of the whole, FIG. Is a side cross-sectional view of the main part.
In the figure, the same components as those of the conventional example shown in FIG. 7 are
denoted by the same reference numerals as the conventional example, and the description of the
same components will be omitted.
Reference numeral 11 denotes a through screw hole which is provided at a position other than
the force transmission surface of the elliptical shell 1 which is a container, and which penetrates
from the outside of the elliptical shell 1 to the oil space 8 which is a space portion. The pressure
is applied to the oil 4 that has been injected. Reference numeral 12 denotes a screw plug screwed
into the through screw hole 11. The fluid pressure pressurizing means for applying a pressure
load to the fluid of the oil space 8 according to the first embodiment is constituted by the
through screw hole 11 and the screw plug 12.
[0012]
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The diameter and length of the through screw hole 11 are set so as not to affect the Helmholtz
resonance system. Further, the reason why the through screw hole 11 is provided at a position
other than the force transmission surface of the elliptical shell 1 is that the force transmission
efficiency is lowered when the through screw hole 11 is disposed on the force transmission
surface. Furthermore, the diameter of the through hole 7 is determined by the use zone. The oil 9
is selected depending on the type of use and the viscosity of the oil. The oil 9 may not be oil as
long as it can be regarded as an incompressible viscous fluid. Further, for example, it may not be
fluid as long as it has fluidity such as gel.
[0013]
(Operation) In the first embodiment, when a pressure load is applied to the oil 9 filled in the oil
space 8, the additional oil 9 is lubricated in the through screw hole 11 to the vicinity of the
opening, and thereafter the through screw hole A screw plug 12 is screwed on 11 to apply a
pressure load to the oil 9. When a pressure load is applied to the oil 9 filled in the oil space 8, the
rigidity of the rigid connection between the drive unit 2, the transmission rod 5 and the piston
unit 6 is enhanced. Therefore, when the drive unit 2 vibrates at a high frequency of the
resonance frequency which is a use band, the oil 9 in the through hole 7 which is a flow space is
more difficult to move and the oil 9 apparently becomes a completely rigid body. The vibration of
the drive unit 2 can be transmitted to the elliptical shell 1 more efficiently than in the case where
no pressure load is applied to the oil 9 through the transmission rod 5. Further, at low
frequencies outside the use band, the oil 9 moves leftward and rightward through the through
hole 7 and the transmission rod 5 and the piston part 6 only move leftward and right, the
vibration of the drive part 2 is transmitted to the elliptical shell 1 I will not.
[0014]
In the first embodiment, additional oil is lubricated up to the vicinity of the opening in the
through screw hole 11, and thereafter, a pressure load is applied to the oil 9 by screwing the
screw plug 12 into the through screw hole 11. However, oil pressurized by the oil pressurizing
means may be applied to the through hole, and then the through hole may be plugged to apply a
pressure load to the oil 9 in the oil space 8. Further, as the viscosity of the oil 9 is increased
without losing the fluidity, a bonding force by friction is generated, and the transmission
efficiency is increased. It should be noted that, for depth changes very slow, the elliptical shell 1
is elongated in the major axis direction by the water pressure, but the oil 9 in the oil space 8 is a
through-hole 7 as in the low frequency operation described above. , And no force is applied to
the drive rod 2 since no force is applied to the transmission rod 5.
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[0015]
(Effects) As described above, in the first embodiment of the present invention, the fluid pressure
pressurization configured by the through screw hole 11 and the screw plug 12 when the drive
unit 2 vibrates at a high frequency of the resonance frequency that is the use band. The pressure
load is applied to the oil 9 filled in the oil space 8 by the means, and the rigidity of the rigid
connection between the drive unit 2, the transmission rod 5 and the piston unit 6 is enhanced,
and the oil 9 in the through hole 7 which is a flow space. Is more difficult to move and the oil 9
apparently becomes a completely rigid body, so that the elliptical shell 1 is more efficiently
compared to the case where the pressure of the oil 9 is not applied to the oil 9 via the
transmission rod 5. It can be transmitted and cavitation is also prevented.
[0016]
Second Embodiment
(Configuration) FIG. 2 is a structural view of the underwater transducer according to
Embodiment 2 of the present invention, FIG. 2 (a) is a plan sectional view of the whole, FIG. 2 (b)
is a side view of the whole, FIG. Is a side cross-sectional view of the main part. The second
embodiment of the present invention does not have the through screw 11 and the screw plug 12
as in the first embodiment, and the heater 13 is attached at a position near the driving portion in
the elliptical shell 1. The heater 13 is a heating means for applying a pressure load to the oil 9 in
the oil space 8 by thermal expansion. The other configuration is the same as that of the first
embodiment. (Operation) In the second embodiment, the heat generation energy of the heater 13
is transmitted to the oil 4 of the oil space 8 through the elliptical shell 1 to cause the oil 4 to
thermally expand, and the oil 9 is utilized by utilizing the thermal expansion. The pressure is
applied to the The heater 13 may be attached to a place other than the elliptical shell 1 as long
as the heat energy can be efficiently transmitted to the oil 49.
[0017]
(Effects) In the second embodiment of the present invention, a pressure load is applied to the oil
9 in the oil space 8 by the fluid pressure pressurizing means constituted by the heater 13, and
the drive portion 2, the transmission rod 5, and the piston portion 6 The rigidity of the rigid
connection is increased, the oil 9 in the through hole 7 which is the flow space is more difficult to
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move, and the oil 9 apparently becomes a completely rigid body. Compared to the case where no
pressure load is applied to the oil 9, the oil can be transmitted to the elliptical shell 1 more
efficiently, and cavitation is also prevented. Further, the structure can be simplified simply by
attaching the heater 13 to the elliptical shell 1.
[0018]
Third Embodiment (Configuration) FIG. 3 is a structural view of the underwater transducer
according to Embodiment 3 of the present invention, FIG. 3 (a) is a plan sectional view of the
whole, FIG. 3 (b) is a side view of the whole, FIG. Is a side cross-sectional view of the main part.
The third embodiment of the present invention does not have the through screw 11 and the
screw plug 12 as in the first embodiment, the transmission rod 5 is formed of the heat pipe 15,
and the heat radiating member is provided to the piston portion 6 provided on the heat pipe 15.
It has a structure in which 16 is attached. The other configuration is the same as that of the first
embodiment.
[0019]
(Operation) In the third embodiment, instead of the heat energy obtained from the heater 12 of
the second embodiment, the heat energy generated when the drive unit 2 is driven is transferred
to the oil of the oil space 8 through the heat pipe 15. Then, the oil 4 is thermally expanded, and
the thermal expansion is used to load the oil 9 with pressure. Further, since the heat dissipating
member 16 is attached to the piston portion 6, the transfer of the heat energy to the oil 4
becomes better. (Effects) In the third embodiment of the present invention, a pressure load is
applied to the oil 4 in the oil space 8 by the fluid pressure pressurizing means constituted by the
heat pipe 15, and the drive portion 2, the transmission rod 5 and the piston portion 6 Since the
rigidity of the rigid connection with this increases and the oil 9 in the through hole 7 which is a
flow space becomes more difficult to move and the oil 9 apparently becomes a completely rigid
body, the vibration of the drive unit 2 passes through the transmission rod 5 As compared with
the case where no pressure load is applied to the oil 9, the oil can be transmitted to the elliptical
shell 1 more efficiently, and cavitation is also prevented. Further, if the transmission rod 5 is
constituted by the heat pipe 15, the structure is simplified.
[0020]
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Fourth Embodiment (Configuration) FIG. 4 is a structural view of the underwater transducer
according to Embodiment 4 of the present invention, FIG. 4 (a) is a plan sectional view of the
whole, FIG. 4 (b) is a side view of the whole, FIG. Is a side cross-sectional view of the main part.
According to the fourth embodiment of the present invention, the through hole 21 corresponding
to the through screw hole 11 of the first embodiment is disposed at a position receiving the
water pressure of the elliptical shell 1 and velofam 22 instead of the screw plug 12 of the first
embodiment. Is a structure attached to the outer end of the through hole 21. The fluid pressure
pressurizing means for applying a pressure load to the oil 9 in the oil space 8 in accordance with
the depth change is constituted by the through hole 21 and the bellows 26. The other
configuration is the same as that of the first embodiment.
[0021]
(Operation) In the fourth embodiment, a pressure load is applied to the oil 9 by water pressure
instead of the preload in the first embodiment, and a pressure load of water pressure is applied
by the velocity drum 22 in response to a change in depth. (Effect) In the fourth embodiment of
the present invention, the pressure load is applied to the oil 9 in the oil space 8 by the fluid
pressure pressurizing means for applying the pressure load corresponding to the depth change
constituted by the through hole 21 and the veloff ram 22. Rigidity of the rigid connection
between the drive unit 2, the transmission rod 5 and the piston unit 6 is increased, and the oil 9
in the through hole 7 which is a flow space is more The vibration of the drive unit 2 can be more
efficiently transmitted to the elliptical shell 1 compared to the case where no pressure load is
applied to the oil 9 through the transmission rod 5, and cavitation is also prevented. Further, the
structure for maintaining the pressure of the oil space 8 at high pressure is not necessary.
[0022]
Embodiment 5 (Configuration) FIG. 5 is a structural view of the underwater transducer according
to Embodiment 5 of the present invention, FIG. 5 (a) is a plan sectional view of the whole, FIG. 5
(b) is a side view of the whole, FIG. Is a side cross-sectional view of the main part. In the fifth
embodiment of the present invention, the through hole 31 corresponding to the through screw
hole 11 of the first embodiment is disposed at a position in contact with water of the elliptical
shell 1, and the oil space 8 is filled with water through the through hole 31. Structure. In this
embodiment, since the pressure applied to the transmission rod 5 has an outer diameter
(pressure receiving area) to such an extent that the prestress of the drive unit 2 is not affected,
the through hole 31 is provided in the lid 10. The fluid pressure pressurizing means for applying
a pressure load in response to the depth change is constituted by the through hole 31. The other
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configuration is the same as that of the first embodiment.
[0023]
(Operation) In the fifth embodiment, as the depth increases, the water pressure of the water
flowing in from the through hole 31 is increased, and the water pressure of the water in the oil
space 8 is such that a pressure load is applied. In the fifth embodiment of the present invention,
the fluid pressure pressurizing means for applying a pressure load corresponding to the depth
change formed by the through hole 31 causes the water flowing from the through hole 31 to be
deeper as the depth becomes deeper. As the water pressure rises, the water pressure in the oil
space 8 becomes pressure-loaded, and the deeper the depth, the more rigid the rigid connection
between the drive unit 2, the transmission rod 5, and the piston unit 6, Since the water in the
through hole 7 which is a flow space is more difficult to move and the water apparently becomes
a completely rigid body, when the vibration of the drive unit 2 does not apply a pressure load to
the oil 9 via the transmission rod 5 In comparison, it can be transmitted to the elliptical shell 1
more efficiently, and cavitation is also prevented. Further, the structure for maintaining the
pressure of the oil space 8 at high pressure is not necessary.
[0024]
Sixth Embodiment (Configuration) Embodiment 6 of the present invention does not have the
through screw 11 and the screw plug 12 as in Embodiment 1, and is filled with a fluid in a
condensed state cooled at the time of manufacture, and the fluid is heat when used at normal
temperature. It is of a structure designed to be a pressure fluid to which a pressure load is
applied by expansion. The other configuration is the same as that of the first embodiment.
Concretely, the oil space 8 is filled with the oil 9 at 0 degree to -60 degree at the time of
manufacture to complete the underwater transducer. Then, the completed underwater transducer
is used at normal temperature. (Operation) In the sixth embodiment, at the time of use at normal
temperature, the oil 9 is a pressure fluid to which a pressure load is applied by thermal
expansion. The fluid filled in the oil space 8 is not limited to the oil 9, but may be seawater or the
like as long as it does not freeze at a low temperature.
[0025]
(Effect) As in the first embodiment, since the oil 9 is in a state of being subjected to pressure load
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by thermal expansion when used at normal temperature, rigid connection between the drive unit
2, the transmission rod 5, and the piston unit 6 is performed. The rigidity of the fluid 9 is
increased, and the oil 9 in the through hole 7 which is a flow space is more difficult to move, and
the oil 9 apparently becomes a completely rigid body. Compared to the case where no pressure
load is applied, it can be transmitted to the elliptical shell 1 more efficiently, and cavitation is also
prevented. In addition, since it is only necessary to fill the oil space 8 with the oil 9 at 0 degree to
-60 degree at the time of manufacture, the structure becomes simple.
[0026]
As described above, according to claim 1 of the present invention, since the container of the
underwater transducer is provided with the fluid pressure pressurizing means for applying
pressure load to the fluid in the space portion, the drive portion and the transmission rod The
rigidity of the rigid connection with the piston part is increased, and when the drive part or the
container vibrates in the desired frequency range, the fluid in the flow space becomes more
difficult to move, and either vibration of the drive part or the container becomes the other The
transmission efficiency to be transmitted is improved, and cavitation is also prevented.
[0027]
Further, according to claim 5 of the present invention, since the container of the underwater
transducer is provided with the fluid pressure pressurizing means for applying the pressure load
corresponding to the depth change to the fluid of the space portion, the drive is performed
according to the depth change. The rigidity of the rigid connection between the rod, the
transmission rod and the piston increases, and the fluid in the flow space becomes more difficult
to move when the drive or the container vibrates in the desired frequency range. It has the effect
that the transmission efficiency in which the vibration of one of the containers is transmitted to
the other is improved and cavitation is also prevented.
[0028]
Further, according to claim 6 of the present invention, the space portion provided on the
container side of the underwater transmitter-receiver at the time of manufacture and in which
the piston portion can move is filled with a fluid from 0 degrees to -60 degrees. Since it is at
normal temperature, the fluid pressure in the space in use is increased due to thermal expansion,
and the rigidity of the rigid connection between the drive part, the transmission rod and the
piston part is increased, and the drive part or container is desired When it vibrates in the
following frequency range, the fluid in the flow space becomes more difficult to move, the
transmission efficiency in which the vibration of either the drive unit or the container is
transmitted to the other is improved, cavitation is also prevented, and The container of the
underwater transducer does not have to be provided with a fluid pressure pressurizing means for
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applying a pressure load to the fluid in the space, which has the effect of being able to be
manufactured inexpensively.
[0029]
Brief description of the drawings
[0030]
1 is a structural diagram of the underwater transducer according to Embodiment 1 of the present
invention.
[0031]
2 is a structural diagram of the underwater transducer according to Embodiment 2 of the present
invention.
[0032]
3 is a structural diagram of the underwater transducer according to Embodiment 3 of the present
invention.
[0033]
4 is a structural diagram of the underwater transducer according to Embodiment 4 of the present
invention.
[0034]
5 is a structural diagram of the underwater transducer according to Embodiment 5 of the present
invention.
[0035]
6 is a structural diagram of a conventional underwater transducer.
[0036]
7 is a structural diagram of another conventional underwater transducer.
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[0037]
Explanation of sign
[0038]
Reference Signs List 1 oval shell 2 drive unit 5 transmission rod 6 piston unit 7 through hole 8
oil space 9 oil
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