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JPH0536995

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DESCRIPTION JPH0536995
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater speaker which is used by being placed in water and, for example, as a sound source
for water pipes suitable for use as a sound source for detecting the position of a water pipe
buried in the ground. To the speaker
[0002]
2. Description of the Related Art An underwater speaker used underwater or a speaker connected
to or installed at the end of a water pipe to transmit a sound into a water pipe always receives
surrounding water pressure on a diaphragm. These conventional examples will be described
based on the drawings. FIG. 4 (a) shows a state in which the underwater speaker is used at a
defined water pressure. In the figure, the diaphragm 3 of the underwater speaker 2 is kept in
balance with the water pressure by the water 1. In addition, 20 is a water surface, 5 is a drive
source.
[0003]
FIG. 5 (a) shows a water pipe sound producing speaker being used at a prescribed water
pressure. In the figure, the diaphragm 3 of the in-water pipe sound generation speaker 8 is kept
in balance with the water pressure by the water 1. In addition, 10 is a damper, 11 is a coupling
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part which connects the speaker 8 and the water pipe 12 for in-water sound generation.
[0004]
However, when the underwater speaker is installed at a deeper position than the defined water
depth, as shown in FIG. 4 (b), the vibration system (diaphragm 3 and driving rod 6) Etc.), and
even if it is returned to the specified water depth, it will suffer irreparable damage. This may
occur, for example, due to an unexpected event such as a broken rope hanging the speaker
[0005]
In addition, when using a water pipe sound generation speaker, for example, if the water flow
system and a valve that shuts it off are provided in other parts of the water pipe system, a strong
pressure wave is generated in the water in the pipe by opening and closing the valve. May occur
and be transmitted. The pressure wave is transmitted through the water pipe system to the
speaker for sound generation in the water pipe. When this pressure wave is a positive pressure
wave, as shown in FIG. 5B, the diaphragm 3 is pushed to break the edge 4 or damage other parts
of the vibration system. When this pressure wave is a negative pressure wave, as shown in FIG.
5C, the diaphragm 3 is pulled out and the edge 4 is broken or other parts of the vibration system
are damaged. This phenomenon must be taken into consideration in a water pipe system called
water hammer, which uses water flow in the pipe
[0006]
The present invention has been made in view of such a point, and it is an underwater speaker in
which the vibration system is protected from the change in water pressure due to the water
depth in the water and from the water hammer in the water flow in the water pipe system and An
object of the present invention is to provide a speaker for in-water sound generation.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, an underwater speaker for
use in water according to the present invention and a speaker for sound transmission in a water
pipe connected to or installed at an end of a water pipe to transmit sound in a water pipe A
vibration system is composed of a vibration part comprising a drive rod, a diaphragm and the
like, an edge supporting the vibration part and a support part comprising a damper and the like,
or a supporting part for preventing excessive motion of the vibration system It has the feature in
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having provided.
[0008]
[Operation] The underwater speaker used in water and the speaker for sound generation in the
water pipe connected to or installed at the end of the water pipe to transmit sound into the water
pipe comprise vibration parts including a drive rod and a diaphragm as components, It has a
support portion composed of an edge, a damper or the like for supporting these vibrating
portions.
These vibration systems can perform normal operation by balancing the fluid pressure outside
the speaker and the internal pressure.
If the balance between the fluid pressure outside the speaker and the internal pressure is broken,
a bearing is provided in the vibration system or in the vicinity thereof to prevent the vibration
system from overheating unless displacement of the vibration system becomes impossible to
recover. The bearing which prevents the vibration of the vibration system can protect the
vibration system from water pressure change due to water depth in water and from water
hammer in water flow in water system.
[0009]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a view showing a first embodiment of the underwater speaker according to the present
invention. As shown in the figure, the support 7 is provided behind the diaphragm 3 of the
underwater speaker 2 and the pressure in the surrounding area rises, and even if the diaphragm
3 is deformed inward, the diaphragm 3 is above a certain pressure It is supported by the support
portion 7 so that the amount of deformation is not more than that, and the diaphragm 3 is
prevented from being irreparably damaged or deformed. In addition, 1 is water, 20 is a water
surface, and 5 is a drive source.
[0010]
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FIG. 2 is a view showing a first embodiment of the speaker for sound generation in a water pipe
according to the present invention. As shown in the figure, supports 7 are provided in front of
and behind the diaphragm 3. This is because, as described above, it is necessary to consider
positive and negative pressure in response to the water hammer phenomenon generated in the
water pipe system utilizing the water flow in the pipe. In addition, 4 is an edge and 12 is a water
pipe.
[0011]
Next, a description will be given of an embodiment of a speaker for sound generation in a water
pipe according to the present invention. In this embodiment, a speaker is used as a sound source
for buried water pipe position detection, and the sound source is used to transmit sound into the
water pipe, and the sound transmitted through the water pipe is searched on the ground surface
and buried thereby. In order to use the sound source to detect the position of the water pipe and
to set the speaker in a special place, it is required that no damage occurs to the vibration system
such as the diaphragm by water pressure, and the present invention was developed from such a
viewpoint is there. Therefore, knowing the position of the buried water pipe from the ground has
the following advantages.
[0012]
【0012】1. Knowing the correct location will eliminate the need for trial drilling and
minimize the cost of ground drilling. In addition, in the case of roads, it is possible to reduce the
closing time.
[0013]
【0013】2. Leakage prevention is an important issue from the viewpoint of effective
utilization of resources at present, but by using it together with other methods such as
correlation leak detection, etc., it becomes possible to detect and detect a leaked part properly
and to prevent leakage Is a useful technology.
[0014]
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【0014】3. Unnecessary buried pipes can be found, and it becomes easy to remove dead
pipes and other unnecessary pipes that may cause water leakage in the future.
[0015]
【0015】4. It is easy to create a piping diagram that accurately shows the water pipe
burial position, and it is useful for piping planning and piping work.
[0016]
FIG. 3A is a view showing a second embodiment of the underwater speaker according to the
present invention. As shown in the figure, the support 7 is provided to support the drive rod-side
support 9 for driving the diaphragm 3. In this supporting method, the diaphragm 3 is not directly
supported, but a part of the support system or drive system of the diaphragm is supported.
[0017]
FIG. 3 (b) is a view showing a second embodiment of the water pipe speaker according to the
present invention. As shown in the figure, the support 7 is provided to support the drive rod-side
support 9 for driving the diaphragm 3. In this supporting method, the diaphragm 3 is not directly
supported, but a part of the support system or drive system of the diaphragm is supported.
Although the above description does not refer to the overall shape of the speaker, the present
invention can be applied to various shapes such as other cubes and rectangular parallelepipeds
as well as a general cylindrical type.
[0018]
As described above, in the underwater speaker and the water pipe internal speaker according to
the present invention, the supporting portion for directly supporting the diaphragm is provided
in the vicinity of the vibration system or the drive excluding the diaphragm Since the support for
supporting a part of the system is provided at or near the vibration system, it protects the
vibration system from water pressure changes due to water depth in water and from water
hammers in water flow in water systems. be able to.
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