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JP2000115870

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DESCRIPTION JP2000115870
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
sealing device for an underwater sound source for separating an air chamber of the underwater
sound source from the outside water.
[0002]
2. Description of the Related Art A resonance type sound source device is known as a sound
source device that emits low frequency sound (about 10 to 200 Hz) in water. This is to excite the
diaphragm by the actuator at its natural frequency in water. Since this utilizes the resonance
point of the diaphragm, there is an advantage that a large sound pressure can be obtained with
less power.
[0003]
In this sound source device, one side of the diaphragm is exposed to water, and the other side is
exposed to the air chamber. The air chamber is suitably pressurized to balance the diaphragm
against water pressure. The air chamber is divided by a bottomed cylindrical air chamber
housing forming the outer shell and a diaphragm provided at the opening of the air chamber
housing.
05-05-2019
1
[0004]
The gap between the diaphragm and the air chamber housing needs to be sealed in a watertight
manner while allowing the diaphragm to slide.
[0005]
Therefore, conventionally, as shown in FIG. 3, a diaphragm type seal device has been adopted.
In this sealing device, the diaphragm 53 is slidably installed on the inner peripheral surface 52 of
the air chamber housing 51, and on one side of the water side, a diaphragm-like rubber seal plate
54 is interposed via pressing plates 55 and 56. It is attached. A space 57 in which the seal plate
54 is deformed is formed between the air chamber housing 51, the diaphragm 53 and the
pressing plates 55 and 56, and the seal plate 54 is curved in the space 57.
[0006]
When the diaphragm 53 is vibrated, the diaphragm 53 slides along the inner circumferential
surface 52. At this time, the curved portion of the seal plate 54 is deformed so as to follow the
movement of the diaphragm 53.
[0007]
In addition to the diaphragm type, there is also a method of disposing and sealing an O-ring
between the air chamber housing and the diaphragm.
[0008]
However, in the above-mentioned diaphragm type seal device, the curved portion of the seal
plate 54 is repeatedly deformed locally, so the durability is not so good and the underwater
sound source has a long time Could not bear the driving of
[0009]
Further, in the seal device in which the O-ring is disposed, there is a problem that the movement
of the diaphragm is obstructed by the frictional force between the O-ring and the air chamber
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2
housing, etc., so that a normal sound may not be generated. .
[0010]
Therefore, the present invention has been devised to solve the above-mentioned problems, and
an object thereof is to provide an underwater sound source seal device which can withstand longtime operation of an underwater sound source and can generate an accurate sound. It is to do.
[0011]
SUMMARY OF THE INVENTION In order to solve the above problems, according to the present
invention, a diaphragm vibrated in water is inserted into a seal chamber defined in an air
chamber housing of an underwater sound source with a predetermined gap therebetween. And
an elastic tube filled with fluid in the gap.
[0012]
According to the above configuration, the elastic tube follows the vibration of the diaphragm and
is deformed in the expansion / contraction direction, so the movement of the diaphragm is not
impeded, accurate sound can be generated, and local stress is generated in the elastic tube. Since
this does not occur, a long life can be achieved and the long-time operation of the underwater
sound source can be tolerated.
[0013]
The elastic tube is preferably provided on both the water side and the air chamber side of the
diaphragm in the seal chamber.
According to this, further improvement of the sealing performance is achieved.
[0014]
Further, it is preferable that a pressure regulator is further provided to adjust the internal
pressure of the elastic tube.
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According to this, the internal pressure of the elastic tube can be adjusted at any time according
to the depth of the underwater sound source.
[0015]
A preferred embodiment of the present invention will be described with reference to the attached
drawings.
[0016]
FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of a seal
structure of an underwater sound source according to the present invention, and FIG. 2 is a front
view showing an underwater sound source.
[0017]
First, the configuration of the seal structure of the underwater sound source will be described.
[0018]
As shown in the drawing, a disk-shaped diaphragm 3 is attached to the opening 2 of the air
chamber housing 1 formed in a bottomed cylindrical shape with water tightness, and the air
chamber 4 is provided in the inside thereof. It is sectioned.
And, inside the air chamber 4, an actuator (not shown) for vibrating the diaphragm 3 in the
direction of the arrow is provided.
[0019]
The air chamber housing 1 is configured by mutually connecting a cylindrical housing portion 5
with a bottom and a pressing plate 6 formed in a ring shape along the opening end thereof.
A seal chamber 7 is defined on an inner peripheral side of a joint portion between the housing
portion 5 and the pressing plate 6.
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The sealing chamber 7 is formed by combining the concave portions 8 and 9 formed facing each
other along the periphery of the opening portion 2 in the housing portion 5 and the pressing
plate 6, respectively.
The distance between the bottoms of the recesses 8 and 9 is larger than the thickness of the
peripheral portion of the diaphragm 3 by a predetermined length.
[0020]
An opening 11 is formed on the inner peripheral side of the sealing chamber 7, and the
diaphragm 3 is inserted from the opening 11 into the sealing chamber 7 with a predetermined
gap 15 therebetween.
[0021]
The opening 11 is partitioned by a ring-shaped protrusion 14 extending from the housing 5 and
the holding plate 6 so as to face each other, and the depth of the opening 11 in the front-rear
direction is the thickness of the peripheral portion of the diaphragm 3 It is formed to be slightly
larger than the width and smaller than the distance between the bottoms of the recesses 8 and 9.
The protrusion 14 suppresses excessive vibration of the diaphragm 3.
[0022]
In the gap 15 around the diaphragm 3 in the seal chamber 7, a pair of elastic tubes 16 are
provided which are respectively joined to both the water side and the air chamber side of the
diaphragm 3.
The elastic tube 16 is made of rubber or a member having an elastic modulus equal to that of the
rubber, and is formed in a ring shape along the peripheral portion of the diaphragm 3.
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Also, the inside thereof is filled with a fluid 17 consisting of gas or liquid.
[0023]
The elastic tube 16 covers the inner wall of the sealing chamber 7 and one side of the peripheral
portion of the diaphragm 3 in surface contact with each other with a predetermined sealing
pressure to separate and seal the air chamber 4 and the water outside the chamber. It has
become.
[0024]
Further, a pressure regulator (not shown) for adjusting the internal pressure is connected to the
elastic tube 16.
The pressure regulator appropriately adjusts the internal pressure of the elastic tube 16 in
accordance with the change in water pressure based on the depth of the water source.
[0025]
Next, the operation of the seal structure of the underwater sound source will be described.
[0026]
When using an underwater sound source, the internal pressure of the air chamber 4 is changed
according to the change in external water pressure, and the diaphragm 3 is pressure-balanced
with respect to the water pressure.
Then, the diaphragm 3 is vibrated by the actuator, and the vibration is transmitted to water to
generate underwater sound.
[0027]
At this time, the internal pressure of the elastic tube 16 is also appropriately adjusted by the
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pressure regulator.
This counteracts the water pressure and ensures sealing.
[0028]
In addition, since the elastic tube 16 has appropriate elasticity and the fluid 17 is filled therein,
the elastic tube 16 has an appropriate strength, and the whole of the expansion / contraction
direction with respect to the vibration of the diaphragm 3. Since the deformation can be followed
and stress is not locally applied as in the prior art, the improvement of the durability can be
achieved and the long-time operation of the underwater sound source becomes possible.
[0029]
Furthermore, since the elastic tube 16 has no friction with the diaphragm 3, the movement of the
diaphragm 3 is not inhibited.
This makes it possible to generate an accurate sound and widen the application range of the
underwater sound source.
[0030]
Further, by providing the pressure regulator, the internal pressure of the elastic tube 16 can be
easily adjusted as needed even with changes in water pressure due to differences in water depth,
and it becomes possible to stably obtain a predetermined seal pressure. . The internal pressure of
the elastic tube 16 may be made different. For example, the water side may be at high pressure
and the air chamber side may be at low pressure.
[0031]
In the above embodiment, the elastic tubes 16 are respectively provided for one ring on both the
water side and the air chamber side of the diaphragm 3, but a plurality of elastic tubes 16 may
be arranged in the radial direction. According to this, the internal pressure can be further finely
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controlled, and the further improvement of the sealing performance can be achieved.
[0032]
As described above, according to the present invention, the excellent effect of being able to
withstand long-time operation of an underwater sound source and generating an accurate sound
is exhibited.
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