JP2009147689

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DESCRIPTION JP2009147689
An underwater sound source seal device having an emergency seal mechanism is provided. An
enclosure (2) to be immersed in water, a diaphragm (4) fitted in an opening (3) formed in the
enclosure (2) and one side facing the water, and the outer periphery of the diaphragm (4) and the
inner periphery of the opening (3) A flexible seal member 5 which is disposed so as to keep the
watertightness while allowing the diaphragm 4 to reciprocate into water, an actuator 6 housed in
the enclosure 2 to reciprocate the diaphragm 4, and a diaphragm The auxiliary seal member 7 is
in close contact with the diaphragm 4 when it is located at the end of the range of motion, and
seals the inside from the flexible seal member 5 of the enclosure 2. [Selected figure] Figure 1
Underwater sound source seal device
[0001]
The present invention relates to an underwater sound source seal device having an emergency
seal mechanism.
[0002]
Acoustics can be used in oceans, lakes, rivers, etc. to conduct various academic and technical
surveys.
For example, when sound waves are emitted in water, the sound waves reflected and returned
can be measured to investigate the topography of the bottom of the water and the properties of
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the material constituting the bottom of the water.
[0003]
A sound source used for this purpose is called an underwater sound source, and a diaphragm is
attached to the opening of the enclosure, and a hydraulic actuator for vibrating the diaphragm is
provided inside the enclosure to vibrate the diaphragm in water Emits sound waves in the water.
In the case where the frequency of the sound wave is low frequency, in order to excite the
diaphragm at such low frequency in water, hydraulic actuators that reciprocate hydraulically are
used.
[0004]
Inside the enclosure, a hydraulic actuator that vibrates the diaphragm, a hydraulic pressure
source, a valve, and the like are accommodated, and an electrical member that controls the
hydraulic pressure is accommodated. Also, inside the enclosure is added an air pressure (which
may be nitrogen gas) that opposes the water pressure to support the diaphragm against the
water pressure.
[0005]
The enclosure has sufficient mechanical strength and water tightness to withstand use in water.
In addition, the diaphragm has sufficient mechanical strength and water tightness so that it does
not deform even when reciprocating water in the vicinity in contact with the diaphragm surface.
[0006]
However, there is a gap between the diaphragm and the opening of the enclosure. It is necessary
to seal this gap. As the diaphragm reciprocates relative to the enclosure, it is necessary to seal
while ensuring freedom of its movement. For this reason, a diaphragm or a bellows, which is a
flexible sealing member, is disposed between the outer periphery of the diaphragm and the inner
periphery of the opening. This allows the diaphragm to maintain watertightness while allowing
the diaphragm to reciprocate into water.
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[0007]
Japanese Patent Application Laid-Open No. 1-311799 Japanese Patent Application Laid-Open No.
8-251687
[0008]
Although the flexible seal itself is reliable, its mechanical strength is inferior to that of the
enclosure or diaphragm.
For example, the diaphragm is formed of cloth-filled rubber and is not a rigid body such as an
enclosure or a diaphragm. For this reason, the flexible seal member is more likely to be damaged
due to fatigue due to long-term use or collision with foreign objects in water than enclosures and
diaphragms. If the flexible seal member is damaged, water will intrude into the enclosure from
the damaged portion. When this happens in the sea, seawater will infiltrate into the enclosure.
[0009]
Although various members of the hydraulic system and the electric system are accommodated in
the enclosure, the water which has intruded into the enclosure of these members causes
problems such as rust generation, contamination, failure and deterioration. In particular, the
hydraulic actuator is a precision instrument that has a rod made of metal and polished to a high
degree of precision so as to avoid contact with salty water and adhesion of contaminants in the
water. There must be. Once problems such as rust occur, it will be difficult to continue using this
underwater sound source, which will inhibit the progress of the investigation.
[0010]
Therefore, an object of the present invention is to solve the above-mentioned problems and to
provide an underwater sound source seal device having an emergency seal mechanism.
[0011]
In order to achieve the above object, according to the present invention, an enclosure to be
immersed in water, a diaphragm inserted into an opening formed in the enclosure, one surface of
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which is exposed to water, an outer periphery of the diaphragm and the inside of the opening A
flexible seal member disposed between the peripheries to maintain watertightness while allowing
the diaphragm to reciprocate into water; and an actuator housed in the enclosure to reciprocate
the diaphragm; And an auxiliary seal member which is in close contact with the diaphragm when
the diaphragm is located at the end of the range of motion and seals the inside of the enclosure
from the flexible seal member.
[0012]
The auxiliary seal member comprises a packing which is sandwiched between the diaphragm and
the partition facing the diaphragm on the inner side of the enclosure than the diaphragm when
the diaphragm is positioned at the innermost end of the movement range. May be
[0013]
Water leak sensor placed inside the enclosure from the flexible seal member, and auxiliary seal
control to control the actuator so that the diaphragm is positioned at the extreme end of the
movement range when the water leak sensor detects water And a unit.
[0014]
The present invention exhibits the following excellent effects.
[0015]
(1) Since the auxiliary seal member seals the inside from the flexible seal member of the
enclosure, an emergency seal mechanism is formed when the flexible seal member is damaged.
[0016]
Hereinafter, an embodiment of the present invention will be described in detail based on the
attached drawings.
[0017]
As shown in FIG. 1, the seal apparatus 1 for an underwater sound source according to the
present invention comprises an enclosure 2 immersed in water, and a diaphragm 4 fitted in an
opening 3 formed in the enclosure 2 and one side facing in water. A flexible seal member 5
disposed between the outer periphery of the diaphragm 4 and the inner periphery of the opening
3 to keep the diaphragm 4 watertight while allowing the diaphragm 4 to reciprocate into water;
And the actuator 6 that reciprocally drives the diaphragm 4 and the diaphragm 4 are in close
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contact with the diaphragm 4 when the diaphragm 4 is positioned at the extreme end of the
movement range to seal the inside from the flexible seal member 5 of the enclosure 2 And the
auxiliary sealing member 7.
[0018]
The seal apparatus 1 for an underwater sound source in the present embodiment is provided
with two diaphragms 4.
To this end, the enclosure 2 is substantially cylindrical and has openings 3 at both ends.
The diaphragm 4 of each opening 3 is formed to be smaller in diameter than the diameter of the
opening 3 and can be vibrated by the flexible seal member 5 disposed between the outer
periphery of the diaphragm 4 and the inner periphery of the opening 3 And it is kept watertight.
[0019]
The actuator 6 slidably accommodates the piston rod 21 whose one end (fixed end) is fixed to the
inner surface of the diaphragm 4, the piston head 22 attached to the middle of the piston rod 21,
and the piston head 22. The control device (not shown) includes the cylinder 23, the servo valve
24 for adjusting the operation oil supply and discharge to the one surface side chamber and the
opposite surface side chamber of the piston head 22 of the cylinder 23, and the operation oil
source (not shown) By adjusting, the piston rod 21 can be given a reciprocating motion, that is,
displacement, velocity and acceleration.
[0020]
The two actuators 6 have the central axis of the enclosure 2 as a common operating axis, and the
central axes of the piston rod 21, the piston head 22 and the cylinder 23 coincide with this
operating axis.
The two actuators 6 are arranged back to back.
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That is, one actuator 6 has a piston rod 21 extending from the diaphragm 4 placed at one end of
the enclosure 2 to the opposite end of the enclosure 2 and the other actuator 6 placed at the
opposite end of the enclosure 2 A piston rod 21 extends from the plate 4 towards one end of the
enclosure 2 with the free ends of the piston rod 21 facing one another.
[0021]
This actuator arrangement is such that the two actuators 6 cancel each other's reaction force.
That is, when one of the actuators 6 pushes the diaphragm 4 so as to protrude outward, the
other actuator 6 also pushes the diaphragm 4 so as to protrude outward, and the one actuator 6
dents the diaphragm 4 inward The two actuators 6 can cancel each other's reaction force by
causing the other actuator 6 to move in the opposite direction to draw the diaphragm 4 so as to
be recessed inward.
[0022]
In the present embodiment, when the diaphragm 4 is positioned at the innermost end of the
movement range, the auxiliary sealing member 7 is provided with the partition 8 and the
diaphragm 4 facing the diaphragm 4 inside the enclosure 2 rather than the diaphragm 4. The
packing 9 is sandwiched between the two.
The partition wall 8 is cylindrically recessed from the opening 3 into the inside of the enclosure 2
to form a motion space of the diaphragm 4 and is opposed to the diaphragm 4 at the end of the
motion space.
The partition 8 is formed with an internal opening 10 for passing the piston rod 21 of the
actuator 6.
The auxiliary seal member 7 is located radially outward of the internal opening 10.
[0023]
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In the present embodiment, a ring-shaped groove 11 is formed in the partition wall 8, and a
packing 9 is fitted into the groove 11 as the auxiliary seal member 7.
The packing 9 is a ring having the same diameter as the groove 11 and is a so-called V-packing
formed by opening the cross section shown in the figure in a V-shape. The packing 9 has
flexibility, and when the diaphragm 4 is located at the innermost end of the movement range,
that is, when the diaphragm 4 is almost in contact with the partition 8, the V-shaped open part is
closed. It is supposed to be.
[0024]
As described above, since the partition 8 facing the diaphragm 4 is provided on the inner side of
the enclosure 2 than the diaphragm 4, the position where the diaphragm 4 hits the partition 8
when the piston rod 21 is pulled in the actuator 6 As the innermost end (pulling end) of the
movement range of the diaphragm 4. Inside the diaphragm 4, a partition 8 is provided radially
outward of the internal opening 10 through which the piston rod 21 passes, and the packing 9 is
provided so as to surround the internal opening 10. Therefore, as shown in FIG. 2, when the
diaphragm 4 comes to the innermost end in the movement range, the inside (the side on which
the piston rod 21, the cylinder 23 and the like are present) is sealed from the packing 9.
[0025]
In this embodiment, the seal device 1 of the underwater sound source is the leak sensor 12
placed inside the enclosure 2 from the flexible seal member 5 and the diaphragm 4 is the most in
the movement range when the leak sensor 12 detects water. And an auxiliary seal control unit
(included in a control device not shown) that controls the actuator 6 to be positioned at the end.
[0026]
The water leakage sensor 12 is a known one, and has, for example, two electrodes alternately in
noncontact, and in normal operation the electrodes are insulated but when water enters between
electrodes, it becomes conductive or low resistance Water leakage can be recognized by a control
device (not shown).
[0027]
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The leak sensor 12 forms a sensor hole at the lowermost part of the partition 8, inserts the leak
sensor 12 into this sensor hole, and the sensing portion of the leak sensor 12 is located at the
lowermost part between the diaphragm 4 and the partition 8 It is attached.
The electrical wiring of the water leak sensor 12 is wired inside from the partition wall 8.
The underwater sound source seal device 1 is suspended and towed from a mother ship on water
with a cord such as a wire rope, and the upper part in the drawing is the water surface side and
the lower part in the drawing is the water bottom side.
[0028]
Hereinafter, the operation of the underwater sound source seal device 1 of the present invention
will be described.
[0029]
While air pressure is applied to the inside of the enclosure 2 to support the diaphragm 4 against
water pressure, the servo valve 24 in the actuator 6 regulates the operation oil supply and
discharge to the one side chamber and the opposite side chamber of the piston head 22 of the
cylinder 23 By doing this, the diaphragm 4 is excited.
At this time, the flexible seal member 5 disposed between the outer periphery of the diaphragm 4
and the inner periphery of the opening 3 maintains watertightness while allowing the diaphragm
4 to reciprocate in water.
[0030]
However, since the flexible seal member 5 is inferior in mechanical strength to the enclosure 2
and the diaphragm 4, there is a high possibility that the flexible seal member 5 may be damaged
by fatigue due to long-term use or collision with foreign objects in water. Here, it is assumed that
the flexible seal member 5 is damaged.
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[0031]
The water that has infiltrated from the damaged portion of the flexible sealing member 5 falls by
gravity and is applied to the water leakage sensor 12. When the auxiliary seal control unit of the
control device (not shown) recognizes water leakage by the water leakage sensor 12, it
immediately stops the vibration of the vibration plate 4 by the actuator 6, and as shown in FIG.
Move to the innermost end. The diaphragm 4 is in close contact with the auxiliary seal member
7. As a result, the inside is sealed by the auxiliary seal member 7, and the hydraulic system such
as the piston rod 21, the cylinder 23, the servo valve 24 and the like accommodated inside by the
auxiliary seal member 7 and various members of the electric system not shown Protected.
[0032]
Since the sound wave is not received by the mother ship when the excitation of the diaphragm 4
is stopped, it can be understood that an abnormality has occurred in the sealing device 1 of the
underwater sound source. Therefore, the seal device 1 of the underwater sound source is pulled
up on the water. By repairing or replacing the damaged portion of the flexible sealing member 5
on the water and cleaning the flooded portion, it is possible to reuse the sealing device 1 for the
underwater sound source.
[0033]
As described above, in the present invention, the auxiliary seal member 7 serves as a backup of
the flexible seal member 5, and even if the flexible seal member 5 is damaged, it prevents the
water from entering the enclosure 2 and minimizes the damage. You can stop it. And since
various members of the hydraulic system and the electric system in the enclosure 2 are protected
from water, it is possible to restart the investigation in a short time.
[0034]
The present invention is not limited to the above embodiment.
[0035]
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Although the packing 9 is used as the auxiliary sealing member 7 in the above embodiment, the
auxiliary sealing member 7 may be an O-ring.
[0036]
In the above embodiment, the auxiliary sealing member 7 is accommodated in the groove 11
formed in the partition wall 8. However, as shown in FIG. 3, the groove 13 is formed in the
diaphragm 4 and the auxiliary sealing member 7 is accommodated in the groove 13. You may
Further, the groove 14 is formed at the corner of the tip of the partition 8 and the auxiliary seal
member 7 is disposed in the groove 14, and the connecting portion 15 of the diaphragm 4 and
the piston rod 21 is formed in a tapered shape. You may enable it to press.
Also, a space having a diameter larger than the opening 3 is formed inside the opening 3, and the
groove 16 is formed on the back side of the end face of the enclosure 2 facing the space, and the
auxiliary sealing member 7 is disposed in the groove 16. Good. In this case, by moving the
diaphragm 4 to the outermost end of the movement range, the internal seal is achieved from the
auxiliary seal member 7.
[0037]
In the above embodiment, the hole communicating from the opening 23 to the inside of the
enclosure 2 (the inside of the partition 8) is considered to be only the internal opening 10
through which the piston rod 21 passes, but the sensor hole in which the water leakage sensor
12 is inserted There are also cases where it is desirable to secure a sufficient seal. As shown in
FIG. 3, it is assumed that the sensor 18 is inserted into the sensor hole 17 provided in the
partition wall 8. An auxiliary seal member 7 is provided to surround the periphery of the sensor
hole 17. As a result, when the diaphragm 4 moves to the innermost end in the movement range,
the diaphragm 4 comes in contact with the auxiliary seal member 7 around the sensor hole 17,
so a sufficient seal is secured for the sensor hole 18 as well. can do.
[0038]
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In the said embodiment, although the water leak sensor 12 was each installed in the lower part
of the diaphragm 4 of two places, the installation location of the water leak sensor 12, and
number of objects are not restricted to this. As shown in FIG. 4, the drain pipe 41 having a
predetermined slope is disposed from the lowermost portion of the partition 8 to the axial central
bottom portion of the enclosure 2, and the drain pan 42 is disposed at the end of the drain pipe
41. The leak sensor 12 is installed in the drain pan 42. Regardless of which of the two flexible
seal members 5 of the vibration plate 4 is damaged, the entering water flows into the drain pan
42 through the drain pipe 41, so that the water leakage sensor 12 can detect water immersion
quickly. .
[0039]
It is an internal block diagram of the seal ¦ sticker apparatus of the underwater sound source
which shows one Embodiment of this invention. It is a fragmentary block diagram at the time of
internal sealing in the seal ¦ sticker apparatus of the underwater sound source of FIG. It is a
partial block diagram of the seal ¦ sticker apparatus of the underwater sound source which
showed the installation location of the auxiliary ¦ assistant sealing member which shows other
embodiment of this invention. It is an internal block diagram of the seal ¦ sticker apparatus of the
underwater sound source which shows other embodiment of this invention.
Explanation of sign
[0040]
DESCRIPTION OF SYMBOLS 1 Seal device for underwater sound source 2 Enclosure 3 Opening 4
Diaphragm 5 Flexible sealing member 6 Actuator 7 Auxiliary sealing member 8 Partition 9
Packing 10 Internal opening 11 Groove 12 Water leakage sensor
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