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JPH0576197

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DESCRIPTION JPH0576197
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
watertight mold structure of an underwater ultrasonic transducer using cylindrical piezoelectric
electrons.
[0002]
2. Description of the Related Art FIG. 5 is a partially cutaway side view showing a conventional
ultrasonic transducer mold structure using cylindrical piezoelectric electrons. In the figure, 1 is a
cylindrical piezoelectric electron, 2A and 2B are rubber spacers in contact with the side surface
of the piezoelectric electron 1, 3 is a flange, 4 is a clamp, 5 is a lock nut, and 6 is a watertight
structure. The covered primary urethane mold 7 is a secondary urethane mold.
[0003]
Next, assembly of the underwater ultrasonic transducer according to the above construction will
be described with reference to FIG. First, the rubber spacer 2A, the cylindrical piezoelectric
electron 1, the rubber spacer 2B, and the press fitting 4 are attached to the flange 3 in order, and
then they are tightened and fixed by the lock nut 5 with a predetermined torque. Then, in order
to cover the surface with the primary urethane mold 6 in order to form a watertight structure, a
mold 8 shown in FIG. 6 is used. Therefore, a transducer including piezoelectric transducers 1 is
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disposed at the center of the mold 8 and positioned by the stop pin 9. Then, using the mold 8, the
primary urethane mold 6 is formed. After the mold 8 is removed, the secondary urethane mold 7
is formed again in the recess formed by the locking pin 9.
[0004]
However, in the underwater ultrasonic transducer mold structure of the above configuration, it is
necessary to carry out the molding in two steps, so the primary urethane mold and the secondary
urethane mold may be used. Boundary layer is formed. Usually, when a urethane mold is further
applied on a urethane mold, appropriate adhesion strength can not be obtained unless the
surface of the previously formed urethane is roughened or degreased sufficiently, and therefore,
it can not be obtained in water. At the time of use, water intrudes from this boundary layer,
which deteriorates the electrical insulation between the piezoelectric electrodes, and the
performance as a transducer decreases.
[0005]
The present invention uses a chloroprene rubber having good adhesion to the urethane mold to
remove the problem of water intrusion caused by the boundary layer in the urethane mold
described above, and uses the primary urethane mold and the chloroprene. The eye is to form an
excellent watertight structure underwater ultrasonic transducer mold structure that can
strengthen the boundary layer with rubber
[0006]
SUMMARY OF THE INVENTION According to the underwater ultrasonic transducer mold
structure relating to the present invention, it is possible to use a rubber spacer, piezoelectric,
rubber, and a press fitting with chloroprene rubber in which chloroprene rubber is baked on the
press fitting. The spacers are inserted in order and attached to the flange, and the surface is
covered with a urethane mold to form a watertight structure.
[0007]
The present invention can eliminate the need to perform urethane molding twice by using a clasp
with a chloroprene rubber.
[0008]
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2
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a partially cutaway side
view showing an embodiment of an underwater ultrasonic transducer mold structure according
to the present invention.
In the figure, 10 is a clamp with a chloroprene rubber whose detailed configuration is shown in
FIG. 3 and the chloroprene rubber 11 is firmly baked at one end by vulcanization adhesion and
the other end is screwed to the flange 3 by a set screw 12 It is stopped.
The reference numeral 13 denotes a urethane mold covered on the surface to form a watertight
structure.
[0009]
The outermost diameter of the chloroprene rubber 11 is the same as the diameter of the
urethane mold 13, whereby when it is set in the urethane mold 8, the outermost diameter
portion plays a role of positioning.
[0010]
Next, the assembly of the underwater ultrasonic transducer according to the above configuration
will be described with reference to FIG.
First, insert the rubber spacer 2A, piezoelectric electronics 1 and rubber spacer 2B into the
chloroprene rubberized presser bracket 10, and then attach the other end of the chloroprene
rubberized presser bracket 10 to the flange 3 Fasten with and fix.
Then, using the urethane mold 8 shown in FIG. 2, the urethane mold 13 can be formed to have a
watertight structure. At this time, the boundary layer of the chloroprene rubber 11 and the
urethane mold 13 can be firmly bonded.
[0011]
The boundary layer between the chloroprene rubber 11 and the urethane mold 13 is tapered as
shown in FIG. 4 to increase the bonding area with the urethane mold 13 and of course it is
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possible to bond more firmly. .
[0012]
As described above in detail, according to the underwater ultrasonic transducer mold structure
according to the present invention, the urethane mold and the chloroprene rubber can be
provided by providing a metal clamp on which chloroprene rubber is baked. The boundary layer
firmly adheres to the surface, eliminating the ingress of water.
For this reason, the effect that the reliability of the transducer regarding electrical insulation can
be improved
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