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JPS56116791

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DESCRIPTION JPS56116791
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional ultrasonic
transducer, FIG. 2 is a perspective view of an essential part showing an embodiment of the
ultrasonic transducer according to the present invention, FIG. And FIG. 4 is a perspective view
and a sectional view showing another embodiment of the present invention. 1 ииииии Reflector,
21.22 иииииииииииииииииииииииииииииииииииии Heater, 5, 7
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Heater, 5 .....
Tubular body.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
transducer suitable for use in a low temperature atmosphere for an ultrasonic measurement
apparatus fIL 'such as an ultrasonic level meter, in which the present invention is designed to
prevent its freezing. It is about In general, an ultrasonic level meter is widely used for liquid and
powder levels 5sii "because it can be measured by a non-contact 1-leg 4j1-tactile to an object.
This level meter radiates intermittently from the surface of the ultrasonic pulse kill, and
measures the level from the short end of the transducer and the surface of one fixed surface by
utilizing its whole round trip time. Conventionally, as a transducer used in this type of level
meter, as shown in FIG. 1 (&), a cylindrical imaging element 2-Ik is disposed in the central
portion of the reflector 1, and As shown in FIGS. 1 (b) and 1 (e), the respiratory imaging
movement of the moving element 2-1 and the thickness integration or bending imaging
movement of the plate-like vibrator 2-2 are used. There is a thing. In FIG. 1 (a) to (el in FIG. 1,
arrows of one-dot and dash line are respectively shown on the traveling direction of the
ultrasonic wave. However, in the transducer having such a structure, as shown in FIG. 1, the
ultrasonic radiation surface and the reflection surface 3 are exposed to the atmosphere, and the
measurement object is, for example, water or hot water In the case where the wave device is
disposed away from the measurement surface, if the w8 ambient temperature decreases,
condensation may occur on the # 1 ultrasonic radiation surface or the reflection surface 3 as
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1
shown by the X mark in FIG. Or if the ambient temperature 2- is below freezing, it freezes and
Z7t0 Therefore, if freezing becomes thick, ultrasonic waves will not pass and troubles such as
foot measurement will be 11 [K] are often occurring. It was made to remove conventional excises,
and was heated so as to keep the ultrasonic radiation surface or reflection surface of the
transducer at a constant temperature, and by preventing freezing of that part, Always on stable
operation enabled super sound regardless of Transducer 1 is intended to provide. Hereinafter,
the present invention will be described on the basis of one side. FIG. 2 is a perspective view of the
main part showing an embodiment of the ultrasonic transducer according to the present
invention, and in 1 m1 FIG. 2, the same reference numerals as FIG. 1 denote the same or
corresponding parts. In this embodiment, a helical heater 4t is attached to the outer space 1a
corresponding to the ultrasonic radiation surface or reflection surface of the reflector 1, and a
predetermined heating current is supplied to the heater 4 from a heating power supply (not
shown). 9, the outer portion 11L11-is to be heated and maintained at a constant temperature.
According to the transducer of such structure, since the reflector 13-can always be kept at a
constant temperature, the ? reflection surface of the ultrasonic radiation surface t1 (see Fig. 1)
even when the temperature of 1115 I11 drops below the freezing point There is condensation
and ytv can prevent freezing.
This makes the transducer I! 1) It is possible to operate 1 in a stable state at all times according
to the ambient temperature. FIG. 3 shows an embodiment of the present invention, in which the
thickness vibration or curvature of the plate-like image pickup element is formed along the axial
direction of the outer peripheral portion 51 of the transmitter-receiver body 5 utilizing the image
pickup movement. Even if it arranges, the same effect as the above r * example can be achieved.
FIG. 84 shows another embodiment of the present invention, in which a cylindrical body at is
provided so as to cover a portion of the transducer main body T where the ultrasonic radiation
surface 7m is exposed. By incorporating the heater 8 into the cylindrical body 8. Among the
appropriate members 8 which can be heated to a constant temperature and held at 0, the above
description is given for the case where the present invention is applied to an ultrasonic level
meter, but the present invention is not limited to this. Of course, it can be applied to the
ultrasonic wave # 1 fixed child of -4- received the shadow 41 of the temperature degree. As
described above, according to the present invention, the ultrasonic radiation surface or the
reflection surface of the transducer is maintained at a constant temperature, so that the portion
does not condense or freeze, which results in There is an effect that stable operation is always
possible regardless of m #.
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