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JPH02236479

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DESCRIPTION JPH02236479
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention recognizes
the location and shape of structures and various equipment in the reactor inside a high
temperature ultrasonic transducer, in particular, a reactor vessel filled with liquid sodium which
is an opaque substance. Related to [Prior Art] FIG. 3 is a cross-sectional view showing a
conventional high temperature ultrasonic transducer described in Japanese Patent Application
No. 62-319045 filed on Dec. 18, 1987 by the applicant of the present application. In the figure,
(l) is a cylindrical box-shaped stainless steel case, (2) is a stainless steel case cover for sealing the
opening of the stainless steel case (1), assembled by welding to the stainless steel case (1) and
sealed A container is constructed. (3) is a disk-like high-temperature ultrasonic transducer made
of lead titanate ceramic. This high-temperature ultrasonic transducer (3) has a cue point of 380
° C., an electromechanical coupling coefficient of 0.45, and a frequency of about 2. A 5 MHz,
pulse width when assembled as a transducer is 20 μSeQ, and the thermal expansion coefficient
is 6 × 10 ′ ′-8. (4) is a disk-like holding 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 (5). (8) is a vibrator holding screw which constitutes a part of the fixing
member screwed into each screw hole of the holding member holding plate (4), and (7) is
screwed to the tip of the vibrator holding screw (6) (8) is a flexible polyimide which is an
insulating member, and has heat resistance of 250 ° C., insulation of 10 17 Ω / cII, and
radiation resistance of the order of I X 10 7 Rad or more. (9) 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 (3). (10) is a hermetic seal connector attached through the
stainless steel case cover (2), (11) is a wire covered with a silicone rubber tube, the seal
connector (5) and the ultrasonic transducer for high temperature ( 3) are connected. (12) is an
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Ml cable (old nural Insulated Cable) connected to the seal connector (5), and (13) is a post
attached to the stainless steel case cover (2). The conventional high-temperature ultrasonic
transducer is configured as described above, and the high-temperature ultrasonic transducer (3)
made of lead titanate-based ceramic has a curb point of 360 ° C. and a temperature of 200 ° C.
for use of the transducer. C C250 ° C, so it operates normally without influence of temperature
and has a high electromechanical coupling coefficient of 0.45, good conversion efficiency
between electricity and ultrasound, and ultrasound It is assumed that the energy is increased and
the S / N ratio is improved.
The high-temperature ultrasonic transducer (3) made of lead titanate-based ceramic has an
expansion coefficient of 6 × 10 −6, and the thermal expansion coefficient of the stainless steel
case (1) is texio−. The high temperature ultrasonic transducer (3) is made by interposing
silicone oil (9) between the inner surface of the bottom of the stainless steel case (1) and the high
temperature ultrasonic transducer (3), although it is different by 1 digit from 1). Is suppressed
and fixed to the bottom of the stainless steel case (1) by the fixing member consisting of the
holding member holding plate (4) and the vibrator holding screw (6), the stainless steel case (1)
and the ultrasonic vibrator for high temperature (3 The difference in thermal expansion between
the high-temperature ultrasonic transducer (3) and the stainless steel case (1) caused by
temperature changes during storage and high-temperature use and its repeated changes, even if
the thermal expansion coefficient of Oy Absorbed by (9), it is assumed that an excellent durability
without deterioration in initial performance. [Problems to be Solved by the Invention] In the
conventional high temperature ultrasonic transducer as described above, the high temperature
ultrasonic transducer (3) is placed on the bottom of the stainless steel case (1) and the pressing
member holding plate (4) Fixing locally suppressed by a fixing member consisting of a vibrator
holding screw (6) screwed to this, and silicon oil (9) between the stainless steel case (1) and the
high temperature ultrasonic vibrator (3) ), And the thermal expansion coefficients of the high
temperature ultrasonic transducer (3) and the stainless steel case (1) differ from each other. (3)
Or the difference in thermal expansion between the bottoms of the stainless steel case (1) is
absorbed, but air remains in the container constituted by the stainless steel case (1) and the
stainless steel case (2). Carriage The thermal expansion coefficient of the air can not be ignored
at high temperatures of 200 ° C to 250 ° C, and the bottom of the stainless steel case (1) is
formed thin to improve the sound transmission efficiency. Because of the high temperature, the
warpage toward the outside of the bottom of the stainless steel case (1) becomes large at the
time of high temperature use, and it can not be absorbed by the silicone oil (9), and an air layer is
partially formed. In the case of using the above, the air in the container may oxidize the silicone
oil (9), causing part of it to volatilize and deteriorate, and an air layer may form in the silicone oil
(9). Therefore, the ultrasonic energy generated by the high temperature ultrasonic transducer (3)
is less likely to propagate to the stainless steel case (1), causing distortion in the waveform of the
ultrasonic wave, causing deterioration of the S / N ratio and directivity angle. There is also a
problem that the performance degradation such as the deterioration of the distance resolution
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due to the change and the spread of the pulse l1 occurs.
The present invention has been made to solve such problems, and provides a high-temperature
ultrasonic transducer having a good S / N ratio and excellent durability without deterioration of
initial performance and performance deterioration during use. The purpose is that. [Means for
Solving the Problems] A high temperature ultrasonic transducer according to the present
invention comprises a sealed container having a decompressed gas therein, a high temperature
ultrasonic transducer disposed on the inner surface of the bottom of the container, and a
container The silicone oil interposed between the inner surface of the bottom of the container
and the ultrasonic transducer, and the container via the insulating member on which the hightemperature ultrasonic transducer is mounted on the surface opposite to the surface on the
bottom side of the container And a fixing member fixed to the inner surface of the bottom of the
housing. Further, the depressurized gas in the container is made to be an inert gas. Furthermore,
an inert gas may be enclosed in the container without pressure reduction. Furthermore, the fixing
member for fixing the high temperature ultrasonic transducer to the inner surface of the bottom
of the container via the insulating member placed on the surface opposite to the surface on the
bottom of the container has an outer peripheral edge on the inner peripheral surface of the
container With a holding member holding plate to which a plurality of screws are fixed, a
plurality of vibrator holding screws screwed into a plurality of screw holes provided in the
holding member holding plate, and a crown movably covered by the tip of each holding screw It
may be formed by a bottom cylindrical shoe and a spring interposed between the cap screw and
the bottom of the chute, which always biases the shoe towards the bottom of the container.
[Function] In the present invention, an ultrasonic transducer for H is disposed on the inner
surface of the bottom of a sealed container having a decompressed gas inside via a silicone oil,
and the ultrasonic transducer for high temperature is fixed by a fixing member Since it is fixed to
the inner surface of the bottom of the container via an insulating member, even if the bottom of
the container is recessed due to the pressure reduction of the sealing gas during storage, the
recess of the bottom of the container is eliminated by thermal expansion by the gas when using
temperature, The problem of warpage at the bottom of the stainless steel case caused by
temperature changes of the environment and storage place and its repeated temperature change
has been eliminated. Moreover, deterioration by the oxidation of the silicone oil by high
temperature air is prevented by making the pressure-reduced gas in a container into an inert gas.
Even by sealing the inert gas without reducing the pressure in the container, deterioration due to
oxidation of the silicone oil by high temperature air can be prevented. Furthermore, pressing and
fixing the high temperature ultrasonic transducer through the insulating member to the inner
surface of the bottom of the container fixes the high temperature ultrasonic transducer disposed
on the inner surface of the bottom of the container via the silicone oil L7 to the container The
stainless steel case (1) and the ultrasonic vibrator for high temperature when used at high
temperature when used by a shoe which is covered with the tips of a plurality of vibrator holding
screws screwed to the holding member holding plate and biased by a spring. Due to the
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difference in thermal expansion coefficient of (3), a warp is generated at the bottom of the high
temperature ultrasonic transducer or stainless steel case, and even if the silicone oil can not
absorb the warp, the tip of the vibrator retaining screw is expanded by the spring. The moving
shoe covered by the container moves the container contact surface of the high temperature
ultrasonic transducer to follow and follow the inner surface of the container bottom, and the
temperature change of the use environment and storage place Beauty of occurrence of the hot
ultrasonic vibrator caused by repeated temperature change or the air layer due to warping of the
bottom of the stent l Nosukesu is more reliably prevented.
Embodiment 1 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. (18) is a
decompression vibrator attached through the stainless case cover (2). In the high-temperature
ultrasonic transducer configured as described above, the sealing gas in the container constituted
by the stainless steel case (1) and the stainless steel bar (2), for example, air is connected to the
pressure reducing pipe (18) The pressure is reduced to about 0.6 kg / cd by a vacuum pump (not
shown), and then the pressure reduction pipe (18) is closed and the container is sealed under
reduced pressure. Since the bottom of the stainless steel case (1) is recessed inwards and the
sealing gas in the container, for example air, causes thermal expansion during high temperature
use, thereby eliminating the dent in the bottom of the container, temperature changes in the use
environment and storage location and The warpage at the bottom of the stainless steel case (1)
caused by the repeated temperature change ceased to occur. Therefore, an air layer is generated
in the silicone oil (9) by warpage of the stainless steel case (1), and ultrasonic energy generated
by the high-temperature ultrasonic vibrator (3) is less likely to propagate to the stainless steel
case (1) There is no longer any deterioration in performance such as deterioration of S / N ratio
and deterioration of directivity angle due to distortion of ultrasonic waveform and deterioration
of distance resolution due to broadening of pulse width. In addition, if the pressure-sealed sealing
gas in the container is replaced with air as argon gas which is an inert gas, the deterioration of
the silicone oil due to oxidation at high temperature use is eliminated, and even if used for many
years, the silicone oil (9) An air layer is also prevented from being generated. Furthermore, it is
needless to say that degradation of the silicone oil (9) due to oxidation when used at high
temperature can be prevented if argon gas is enclosed instead of air even if the pressure in the
container is not reduced. FIG. 2 is a cross sectional view showing another 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. (1B) is a cylindrical metal bush (I7) with a bottom, which is crowned in the axial
direction of the screw of the vibrator holding screw (8). It is a coil spring interposed between the
bottom of 1B) and urging the shoe (1B) toward the ultrasonic transducer (3). (18) is a
decompression vibrator. In this embodiment, to attach the high temperature ultrasonic
transducer (3) to the stainless steel case (1), first apply silicone oil (9) to the inner surface of the
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bottom of the stainless steel case (1), and after high temperature The ultrasonic transducer (8) is
disposed on the inner surface of the bottom of the stainless steel case (1) coated with the silicone
oil (9).
The polyimide sheet (8), which is a heat-resistant sheet having flexibility as an insulating
member, is placed on the surface of the high-temperature ultrasonic transducer (3) opposite to
the case contact surface. Next, the outside of the pressing member holding plate (4) is screwed
with a vibrator holding screw (8) having a shoe (16) and a spring (l7) on the tip side in each
screw hole of the pressing member holding plate (4). The peripheral edge is fixed to the step
formed on the inner peripheral surface of the stainless steel sleeve (1) with a screw (5). After
that, screw each vibrator holding screw (8), and the high temperature ultrasonic vibrator (3) is a
stainless steel case (1 by the pressing force of the vibrator holding screw (6) and the biasing
force of the coil spring (17). Is fixed to the bottom inner surface of). After that, attach the
stainless steel cover (2) to the stainless steel case (1) by welding. Finally, the container made of
the stainless steel (1) and the stainless case cover (2) is sealed under reduced pressure using the
pressure reducing vibrator (18) as in the embodiment described above. In this embodiment, the
high-temperature ultrasonic transducer (3) disposed on the inner surface of the bottom of the
stainless steel sleeve (1) through the silicone oil (9) is attached to the pressing member holding
plate (4) fixed to the stainless steel sleeve (1). Since it is suppressed and fixed to the inner surface
of the bottom of the stainless steel sheath (1) through the polarizer (8) by the plural screw
screws (6) screwed together and the shoe (1B) covered with the tip, When the high temperature
ultrasonic transducer (3) or the high temperature ultrasonic transducer (3) is different at the
time of high temperature use, a warp occurs in the bottom of the high temperature ultrasonic
transducer (3) or the stainless steel case (1). Even if it becomes impossible to absorb the warp in
9), the shoe (1B) covered on the tip of the vibrator holding screw (8) can be The container
contact surface of the high temperature ultrasonic transducer (3) follows and follows the inner
surface of the bottom of the container, and the high temperature ultrasonic transducer is
generated by the temperature change of the use environment and the storage place and its
repeated temperature change Alternatively, the generation of the air layer due to the warpage of
the bottom of the stainless steel case (1) is more reliably prevented. As described above, the high
temperature ultrasonic transducer disposed on the inner surface of the bottom of the container
via the silicone oil is fixed to the inner surface of the bottom of the container by the fixing
member via the insulating member, as described above. Since the sealing gas in the container is
depressurized, the sealing gas in the container, which has been depressurized by thermal
expansion in advance, expands due to the high temperature even when the bottom of the
container is depressed inward during storage, and the container is Striking of the bottom of the
stainless steel case caused by temperature change of the use environment and storage place and
its repeated temperature change to eliminate the depression of the bottom, the air layer is not
generated in the silicone oil, and the S / N ratio There is an effect that the deterioration of
performance such as the deterioration of the directivity angle and the deterioration of the
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distance resolution is prevented.
In addition, when the pressure-reduced sealing gas in the container is an inert gas, the
deterioration of the silicone oil due to oxidation at the time of high temperature use for a long
time is eliminated, the formation of an air layer in the silicone oil is prevented, and the durability
is maintained. It has the effect of Furthermore, the deterioration of the silicone oil at the time of
high temperature use for a long time can be prevented only by sealing the inert gas without
depressurizing the inside of the container. Furthermore, the suppression fixation of the high
temperature ultrasonic transducer through the insulating member to the inner surface of the
bottom of the container is achieved by fixing the high temperature ultrasonic transducer
disposed on the inner surface of the container through silicone oil to the container The stainless
steel case and high-temperature ultrasonic waves when used at high temperature, when it is
squeezed on the inner surface of the bottom of the container with a shoe covered with a spring
and crowned on the tips of a plurality of vibrator holding screws screwed to the holding member
holding plate. The difference in thermal expansion coefficient of the vibrator causes warpage at
the bottom of the high-temperature ultrasonic vibrator or stainless steel case, and even if the
warpage can not be absorbed by silicone oil, the tip of the vibrator holding screw is stretched by
the expansion and contraction by the spring. The moving shoe covered by the container moves
the container contact surface of the high-temperature ultrasonic transducer to follow and follow
the inner surface of the bottom of the container. There is also an effect that changes and
generation of air layer due to warping of the bottom of the ultrasonic vibrator or stainless steel
case for high temperature caused by the repeated change in temperature is more reliably
prevented.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a
cross-sectional view showing another embodiment of the present invention, and FIG. 3 is a crosssectional view showing a conventional high temperature ultrasonic transducer.
DESCRIPTION OF SYMBOLS 1 ... stainless steel case (container), 2 ... stainless steel case cover
(container), 3 ... high temperature ultrasonic transducer, 4 ... holding screw holding plate (fixed
member), 6 ... vibration Child holding screw (fixing member), 8 ... polyimide (insulation member),
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9 ... silicone oil, 16 ... shush, 17 ... coil spring. Fig. 1 Fig. 2 (Fixed part) 6
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