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JPH01162182

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH01162182
[0001]
[Industrial field of application] The present invention is used to recognize the position and shape
of a structure and various devices in the reactor in a reactor vessel filled with a high temperature
transducer, particularly a liquid sodium filled with an opaque substance, liquid sodium. On what
is PRIOR ART FIG. 2 is a cross sectional view showing a conventional high temperature ultrasonic
transducer. In the figure, (1) is a cylindrical planar stainless steel case, (2) is a stainless steel case
cover for sealing the opening of the stainless steel case (1), and is assembled to the stainless steel
case (1) by welding. Is configured. (3) is a disk-like high-temperature ultrasonic transducer made
of lithium niobate disposed on the inner surface of the bottom of a stainless steel case (1), having
a curb point of 1200 ° C., an electromechanical coupling coefficient K t (K The mechanical
output energy / electrical input energy) is 0.17, the frequency is 2.5 MHz, and the pulse width is
about 50 μsec. (4) is a silver paste (8) which is a bonding member fired at 800 ° C., and the
high temperature ultrasonic transducer (3) is bonded to the inner surface of the bottom of the
stainless steel case (1). (5) is a hermetic seal connector attached through the stainless steel case
cover (2), (6) is a wire covered with a silicone rubber tube, and the seal connector (5) and the
ultrasonic transducer for high temperature ( 3) are connected. (7) is an M1 cable (Mlneral
Insulated Cable) connected to the seal connector (5), and (8) is a post attached to the stainless
steel case cover (2). A conventional high-temperature ultrasonic transducer is configured as
described above, and a sealed container incorporating a high-temperature ultrasonic transducer
(8) consisting of lithium niobate having a curb point of 1200 ° C. has a stainless steel case (1)
and stainless steel Since the case cover (2) is used, the operating conditions are a temperature of
200 ° C. to 250 ° C., radiation 1. Even in the OX 106 Rad order reactor vessel, it has corrosion
resistance and can be used for a long time. In addition, when a predetermined voltage is applied
to the high temperature ultrasonic transducer (3) sealed by the stainless steel case (1) and the
stainless steel case cover (2), an ultrasonic wave with a frequency of 2.5 MHz and a pulse width
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of 50 μsec. The ultrasonic waves are transmitted through the bottom of the stainless steel case
(1) and sent out of the stainless steel case (2). The directivity angle at this time was 1.3 (-8 dB),
and the S / N ratio was at most 20 dB.
[Problems to be Solved by the Invention] In the conventional high temperature ultrasonic
transducer as described above, the high temperature ultrasonic transducer (3) has a Curie point
of 1200 ° C. and an electromechanical coupling coefficient of 0.17 niobic acid. It is excellent in
moisture resistance because it is made of lithium, but it has a small electromechanical coupling
coefficient, poor conversion efficiency between electricity and ultrasonic waves, and a low S / N
ratio due to small ultrasonic energy. was there. Furthermore, the high temperature ultrasonic
transducer (3) is bonded to the inner surface of the bottom of the stainless steel case (1) with a
silver paste (4) as a bonding material, and the high temperature ultrasonic transducer (3) and the
stainless case (1) Because the coefficient of thermal expansion is different, the directivity of the
bottom of the high-temperature ultrasonic transducer (3) or stainless steel case (1) is
deteriorated due to the temperature difference between the working environment temperature
and the storage location and the temperature change repeatedly. Partial or complete peeling of
the ultrasonic transducer (3) from the stainless steel case (1) occurs, and as a result, it is
generated by the high temperature ultrasonic transducer (3). Some or all of the ultrasonic energy
does not propagate to the stainless steel case (1), resulting in deterioration of S / N ratio, change
of directivity angle, and deterioration of performance such as broadening of pulse width. The
present invention has been made to solve the above problems, and its object is to obtain a hightemperature ultrasonic transducer having a good S / N ratio and excellent durability without
deterioration of initial performance. [Means for Solving the Problems] A high temperature
ultrasonic transducer according to the present invention comprises a container made of stainless
steel and a high temperature ultrasonic transducer disposed on the inner surface of the bottom
of the container and having a large electromechanical coupling coefficient. And a heat-resistant
liquid interposed between the inner surface of the bottom of the container and the ultrasonic
transducer for high temperature, and a fixing member for fixing the ultrasonic transducer for
high temperature to the inner surface of the container at the bottom. It is what was constructed.
[Operation] In the present invention, since the high temperature ultrasonic transducer is formed
to have a large electromechanical coupling coefficient, the conversion efficiency between electric
and ultrasonic waves becomes good, and the ultrasonic energy is large. Further, since the high
temperature ultrasonic transducer is fixed to the inner surface of the bottom of the container
made of stainless steel via a liquid having heat resistance, the thermal expansion coefficient of
the high temperature ultrasonic transducer may be different from that of the stainless steel case
The directivity of the high temperature ultrasonic transducer or the base of the stainless steel
case is deteriorated due to temperature change of the use environment and storage place due to
the difference of the thermal expansion coefficients of the two, and the repetition temperature
change, and the high temperature ultrasonic transducer The problem of partial or complete
exfoliation from the stainless steel case has been eliminated.
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FIG. 1 is a cross sectional view showing an embodiment of the present invention. In the figure,
the same components as those of the conventional example are denoted by the same reference
numerals, and the description of the duplicated components is omitted. (1) is a stainless steel
case, and the bottom inner surface is formed in a mirror surface. (2) is a stainless steel case cover
for sealing the opening of the stainless steel case (1), which is assembled to the stainless steel
case (1) by welding to form a sealed container. (13) is a disk-shaped high-temperature ultrasonic
transducer made of lead titanate-based ceramics, and the case contact surface to be brought into
contact with the inner surface of the bottom of the stainless steel case (1) is formed in a mirror
surface. This high temperature ultrasonic transducer (13) has a Curie point of 360 ° C., an
electromechanical coupling coefficient of 0.45, a frequency of about 2.5 M), a pulse width of 20
μsec, and a thermal expansion coefficient of 6 X 1 o-6. (14) is a disk-like pressing member
holding plate which constitutes a part of a fixing member having a plurality of screw holes at
equal intervals, and a step whose outer peripheral edge is formed on the inner peripheral surface
of a stainless steel case (1) It is fixed to the part with a screw (9). (15) is a vibrator holding screw
that constitutes a part of the fixing member screwed into each screw hole of the holding member
holding plate (14), and (1B) is screwed to the tip of the vibrator holding screw (16) A stainless
steel holding piece, (17) is a flexible polyimide which is an insulating member, and has heat
resistance of 250 ° C., insulation of 10 Ω / as, and radiation resistance of the order of I X 107
Rad or more. (18) is a liquid silicone oil, which is interposed between the inner surface of the
bottom of the stainless steel case (1) and the high temperature ultrasonic transducer (13). To
attach the high temperature ultrasonic transducer (13) to the stainless steel case (1), first apply
silicone oil (IB) to the inner surface of the bottom of the stainless steel case (1), and then apply
the high temperature ultrasonic transducer (13) ) Is placed on the inner surface of the bottom of
the stainless steel case (1) coated with silicone oil (18). A polyimide sheet (17), which is a heatresistant sheet having flexibility, is placed on the surface of the high-temperature ultrasonic
transducer (13) opposite to the case contact surface. Next, screw the outer peripheral edge of the
holding member holding plate (14) in which the vibrator holding screw (15) is screwed into each
screw hole into the stepped portion formed on the inner peripheral surface of the stainless steel
case (1) Fix it with After that, screw each vibrator holding screw (15) and press the polyimide
sheet (17) with the holding piece (1B) attached to the tip of the vibrator holding screw (15). The
high-temperature ultrasonic transducer (13) is pressed and fixed to the inner surface of the
bottom of the stainless steel case (1) by the pressing force of 15).
Finally, attach the stainless steel case cover (2) to the stainless steel case (1) by welding. In the
high-temperature ultrasonic transducer configured as described above, the high-temperature
ultrasonic transducer (13) made of lead titanate-based ceramic has a curb point of 360 ° C. and
transducer use conditions of temperature 200 ° C. to 250 ° C. Since it is ° C., the
electromechanical coupling of the high temperature ultrasonic transducer (3) which operates
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normally without influence of temperature and which has an electro-mechanical coupling
coefficient of 0.45 and lithium niobate of the prior art Compared to the coefficient of 0.17, the
conversion efficiency between electricity and ultrasonic waves is good, and the ultrasonic energy
is increased to improve the S / N ratio. The high temperature ultrasonic transducer (13) made of
lead titanate ceramic has a thermal expansion coefficient of 6 X 1 O-6, and the thermal
expansion coefficient of the stainless steel case (1) is tex to = Scase (1) and part are also different.
Therefore, when the high temperature ultrasonic transducer (15) of this embodiment is soldered
to the inner surface of the bottom of the stainless steel case (1) with the silver paste (4) as in the
prior art, the high temperature ultrasonic transducer (13) ) Is soldered to the stainless steel case
(1), but if the use condition is high temperature, the high temperature ultrasonic transducer (15)
or the stainless steel case (1) will warp due to the difference in the expansion coefficient of the
two. The directivity is deteriorated, and partial or total peeling of the high temperature ultrasonic
transducer (15) from the stainless steel case (1) occurs, and it can not be put to practical use.
However, in this embodiment, the stainless steel case (1 Silicone oil (18) between the inner
surface of the bottom of the lower part) and the ultrasonic transducer (13) for high temperature,
and the ultrasonic transducer (I5) for high temperature on the bottom of the stainless steel case
(1) 4) and the vibrator holding screw (15), the vibrator is pressed and fixed, so even if the
thermal expansion coefficients of the stainless steel case (1) and the high temperature ultrasonic
vibrator (13) differ greatly, the vibrator is Silicone oil (18) absorbs the warpage of the hightemperature ultrasonic transducer (13) caused by temperature change during storage and use
and its repeated temperature change, and deterioration of directivity due to warpage caused by
conventional soldering And the problem of peeling does not occur. Therefore, the hightemperature ultrasonic transducer with excellent durability without deterioration of the initial
performance was obtained. Furthermore, by interposing the silicone oil (18) between the high
temperature ultrasonic vibration (15) and the bottom of the stainless steel case (1), the sound is
propagated compared to the case where both are in direct contact, that is, the air layer is
interposed. The efficiency is remarkably improved, and the acoustic transmission efficiency is the
same as in the conventional case where both are joined with silver paste (4).
In addition, since the bottom inner surface of the stainless steel case (1) and the case contact
surface of the high temperature ultrasonic transducer (13) are formed as mirror surfaces, the
bottom of the stainless steel case (1) and the high temperature ultrasonic transducer (15) The
layer of silicone oil (1B) to be interposed therebetween is extremely thin, and the sound
transmission efficiency is improved. Therefore, the S / N ratio is also improved. Furthermore,
since the high-temperature ultrasonic transducer (15) made of lead titanate-based ceramic does
not have interstices like lithium niobate, it is resistant to cracking << and to thermal shock.
Accordingly, the manufacturing yield at the time of manufacturing the ultrasonic transducer is
improved and the life is also improved. In this embodiment, although the high-temperature
ultrasonic transducer (13) is formed of lead titanate-based ceramic having a cue point of 300 °
C. or higher, the present invention is not limited to this, and a stainless steel case (1) and Of
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course, even if the thermal expansion coefficients are different, the present invention can be
applied as long as the electromechanical coupling coefficient is large and the one for high
temperature. For example, there is a lead silicon titanate based ceramic other than the lead
titanate based ceramic. In addition, although silicone oil (18) is used to propagate the sound in
this embodiment, it is needless to say that the same function as silicone oil can be obtained even
if liquid such as oil or liquid metal is used. . As described above, according to the present
invention, the high-temperature ultrasonic transducer having a large electromechanical coupling
coefficient is fixed to the inner surface of the bottom of the container formed of stainless steel by
the fixing member via the liquid having heat resistance. Therefore, the conversion efficiency
between electricity and ultrasonic waves is improved, the ultrasonic energy is increased, the S / N
ratio is improved compared to the conventional one, and the thermal expansion coefficient of the
high temperature ultrasonic transducer is stainless steel. Even if the case is different from the
case, it is a heat resistant liquid that intervenes between the inner surface of the bottom of the
container and the high temperature ultrasonic transducer, which is a high temperature ultrasonic
transducer or a warp at the bottom of the container which And the problem of deterioration of
directivity due to warpage and partial or complete peeling of the high-temperature ultrasonic
transducer from the stainless steel case is also solved, and excellent durability without
deterioration of initial performance There is an effect that it is possible to obtain a high
temperature ultrasound transducer.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a
cross-sectional view showing a conventional high-temperature ultrasonic transducer.
In the figure, (1) is a stainless steel case (container), (2) is a stainless steel case cover (container),
(13) is an ultrasonic transducer for high temperature, (14) is a pressing member holding plate
(fixing member), (15) Is a vibrator holding screw (fixing member), (17) is a polyimide sheet
(insulation member), and (lB) is silicone oil (liquid).
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