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JPH10246773

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DESCRIPTION JPH10246773
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic level meter having improved impact resistance and weather resistance.
[0002]
2. Description of the Related Art FIG. 3 is a schematic view of a conventional example commonly
used in the prior art, which is shown, for example, in US Pat. No. 5,339,292. In the figure, 1 is a
piezoelectric element, and 2 and 3 are first and second electrodes attached to both sides of the
piezoelectric element 1.
[0003]
A Langevin vibrator main body 4 is configured by the piezoelectric element 1 and the first and
second electrodes 2 and 3. Reference numeral 5 denotes a radiation block in which one surface is
in contact with one surface of the first electrode 2. Reference numeral 6 denotes a backing plate
whose one surface is in contact with one surface of the second electrode 3.
[0004]
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1
Reference numeral 7 denotes a bolt which sandwiches and presses the piezoelectric element 1 by
the radiation block 5 and the backing plate 6. Thus, a bolted Langevin vibrator is configured.
[0005]
8 is a matching layer adhered to the other surface of the radiation block 5; 9 is a container in
which a bolt-clamped Langevin oscillator and a matching layer 8 are adhesively housed, and an
ethylene-tetrafluoroethylene copolymer resin (ETFE) is used.
[0006]
In the above configuration, the first and second electrodes 2 and 3 are attached to both surfaces
of the piezoelectric element 1, and the radiation block 5 and the backing plate 6 sandwich the
piezoelectric element 1 and are fastened by bolts. The matching layer 8 is bonded to the other
side of the radiation block 5. The bolted Langevin oscillator and the matching layer 8 are
adhesively housed in the container 9
[0007]
In this case, (1) the bolted Langevin oscillator and the matching layer 8 are bonded to the
container 9 using an adhesive, so depending on the operating temperature range, material
procurement may be performed in consideration of the change in the adhesive strength. If you
do not, there is a risk of peeling and the like.
[0008]
(2) In view of corrosion resistance and low cost, a resin material is used as the container of the
transducer, but it is inferior in impact resistance and weather resistance, lacks reliability, and is
used in places with severe environmental conditions. I can not use it.
[0009]
The present invention solves this problem.
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An object of the present invention is to provide an ultrasonic level meter having improved impact
resistance and weather resistance.
[0010]
SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides (1)
an ultrasonic level meter comprising a transducer having a bolt-clamped Langevin transducer
having a radiation block, the Langevin vibration as described above. An ultrasonic level meter
comprising the transducer container made of metal, wherein the radiation block and the bolt of
the child are integrally formed on the bottom from the beginning.
(2) The ultrasonic level meter according to claim 1, further comprising an acoustic matching
layer provided at the bottom of the container of the transducer. Are constructed.
[0011]
In the above configuration, the first electrode, the first piezoelectric element, the second
electrode and the second piezoelectric element are inserted into the port of the container of the
transducer made of metal. The backing plate is screwed to the bolt, and the first electrode, the
first piezoelectric element, the second electrode and the second piezoelectric element are pressed
against the radiation block and assembled. Hereinafter, the present invention will be described in
detail based on examples.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of
the assembly of the essential parts of one embodiment of the present invention. In FIG. 1,
reference numeral 21 denotes a transducer case container made of metal, in which a radiation
block 22 of a Langevin vibrator and a bolt 23 are integrally formed on the bottom 24 from the
beginning.
[0013]
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Reference numeral 25 denotes an insulating tube inserted into the port 23. Reference numeral
26 denotes a first electrode inserted into the insulating tube 25. Reference numeral 27 denotes a
first piezoelectric element which is inserted into the insulating tube 25 and whose one surface is
in contact with the first electrode 26.
[0014]
Reference numeral 28 denotes a second electrode which is inserted into the insulating tube 25
and whose one surface is in contact with the other surface of the first piezoelectric element 27.
Reference numeral 29 denotes a second piezoelectric element which is inserted into the
insulating tube 25 and whose one surface is in contact with the second electrode 28.
[0015]
Reference numeral 31 denotes a backing plate which is screwed to the bolt 23 and presses the
first electrode 26, the first piezoelectric element 27, the second electrode 28 and the second
piezoelectric element 29 against the radiation block 22. Thus, a Langevin vibrator main body is
constituted by the first electrode 26, the first piezoelectric element 27, the second electrode 28,
and the second piezoelectric element 29.
[0016]
Further, a bolted Langevin vibrator is configured by the bolt 23, the radiation block 22, the first
electrode 26, the first piezoelectric element 27, the second electrode 28, the second piezoelectric
element 29 and the backing plate 31.
[0017]
In the above configuration, the insulating tube 25 is inserted into the port 23 of the container 21
of the transducer made of metal.
The first electrode 26, the first piezoelectric element 27, the second electrode 28, and the second
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piezoelectric element 29 are inserted into the insulating tube 25.
[0018]
The backing plate 31 is screwed to the bolt 23, and the first electrode 26, the first piezoelectric
element 27, the second electrode 28 and the second piezoelectric element 29 are pressed by the
radiation block 22 and assembled.
[0019]
As a result, (1) The backing plate 31 is screwed to the bolt 23 in the transmitter / receiver vessel
21 made of metal and the radiation block 22 and bolt 23 of the Langevin vibrator are integrally
formed on the bottom 24 from the beginning. The first electrode 26, the first piezoelectric
element 27, the second electrode 28, and the second piezoelectric element 29 are pressed by the
radiation block 22 and assembled.
[0020]
Accordingly, since the bolted Langevin vibrator is not adhered to the container 21 using an
adhesive, an ultrasonic level meter is obtained which is not likely to be peeled off or the like.
[0021]
(2) Since the metallic container 21 is used, an ultrasonic level meter with improved impact
resistance and weatherability can be obtained.
As in the prior art, since the resin material is not used as the container, the impact resistance and
the weather resistance are improved, the reliability is improved, and the ultrasonic level meter
which can be used in the severe environmental conditions is obtained.
[0022]
FIG. 2 is an explanatory view of the main configuration of another embodiment of the present
invention.
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In the figure, 41 is an acoustic matching layer provided on the bottom 24 of the transducer
container.
The acoustic matching layer 41 has a function of efficiently transmitting the ultrasonic wave
emitted from the radiation block 22 to the surrounding ultrasonic wave transmission medium.
[0023]
As described above in detail, according to claim 1 of the present invention, (1) the radiation block
of the Langevin oscillator and the bolt are integrally formed on the bottom from the beginning,
and the transmission and reception is made of metal The backing plate was screwed to the
container of the vessel, and the first electrode, the first piezoelectric element, the second
electrode and the second piezoelectric element were pressed against the radiation block and
assembled.
[0024]
Accordingly, since the bolted Langevin vibrator is not adhered to the container using the
adhesive, an ultrasonic level meter is obtained which is not likely to be peeled off or the like.
[0025]
(2) Since a metallic container was used, an ultrasonic level meter with improved impact
resistance and weatherability can be obtained.
As in the prior art, since the resin material is not used as the container, the impact resistance and
the weather resistance are improved, the reliability is improved, and the ultrasonic level meter
which can be used in the severe environmental conditions is obtained.
[0026]
According to the second aspect of the present invention, since the acoustic matching layer is
provided, the ultrasonic wave emitted from the radiation block can be efficiently transmitted to
the surrounding ultrasonic wave transmission medium, and the ultrasonic wave transmission
efficiency is improved. The obtained ultrasonic level meter is obtained.
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[0027]
Therefore, according to the present invention, it is possible to realize an ultrasonic level meter
having improved impact resistance and weather resistance.
[0028]
Brief description of the drawings
[0029]
1 is an explanatory view of the main configuration of an embodiment of the present invention.
[0030]
2 is an explanatory view of the main configuration of another embodiment of the present
invention.
[0031]
3 is a configuration explanatory view of a conventional example generally used from the prior
art.
[0032]
Explanation of sign
[0033]
21 Container 22 made of metal transducer 22 radiation block 23 bottom 24 bottom 25
insulating tube 26 first electrode 27 first piezoelectric element 28 second electrode 29 second
piezoelectric element 31 backing plate 41 acoustic matching layer
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