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JPS539152

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DESCRIPTION JPS539152
Description 1, title of the invention
Water level detection device
3. Detailed Description of the Invention The present invention automatically detects the water
level of the road surface when a road surface flood occurs on a general road, and warns the road
user using a signboard etc. It relates to a water level detection device to be used. Generally, on
roads such as the estuary of roads or under guards with poor drainage, the road surface may be
flooded due to heavy rain or abnormal tide level, making it difficult for vehicles to pass, and in
some cases traffic congestion may occur due to this flooding. The impact of road surface flooding
on road traffic is extremely large. In particular, in the case of roads without detours or evacuation
roads, informing vehicles of this type of road surface flood conditions is important not only for
road safety and smoothness but also for road management. . Therefore, various methods using
bare electrodes or floats have been proposed as methods for detecting the position of the water
surface, but as a water level detection device for detecting road surface flooding, the water to be
detected is contaminated with sewage. There is a problem in reliability and durability because the
electrode, which is salty or salty, is corroded or a malfunction occurs due to EndPage: 1 to dirt.
Thus, detection of road surface flood is extremely inconvenient, and this solution has been
conventionally demanded, but there has been no means for accurate and easy means. SUMMARY
OF THE INVENTION In view of the above-described points, the present invention provides a
water level detection device made to solve such a problem, and the seven configurations and the
like will be described in detail by the illustrated embodiment. FIG. 1 is a block diagram showing
an embodiment of a water level detection device according to the present invention. In the figure,
reference numeral 1 denotes a cylindrical protective pipe for protecting a water level detection
element 2 and a support metal, which will be described later, and is installed on a road shoulder
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of a road j where a road surface flood occurs. A support bracket for fixing the electrostrictive
vibrator to 2 is fixed to a mounting screw inside the protective tube 1. Here, the mounting
bracket 2 is provided with mounting holes for mounting the water level detection element, for
example, every 1 ? ? to a height between the position of the road surface 4 and the highest
water level when the road surface is flooded. The hole is configured to be long and to be moved
to any position. Reference numerals 3a and 3b denote water level detection elements comprising
cylindrical electrostrictive vibrators for detecting the position of the water surface, and one cell is
attached to, for example, the road surfaces 4 to 51 and 20a & depending on the position of the
water surface to be detected. The water level detection element 3a close to the road surface 4
displays an alert for warning due to the occurrence of road surface flooding, and the water level
detection element 3b for detecting the next higher water level generates a warning such as the
closure of the wheel.
FIG. 2 is a structural view showing an internal structure of one embodiment of the water level
detection element used in the present invention. In order to facilitate the understanding of the
present invention, in the drawings to be described first, 5 is an electrostrictive vibrator for
generating a hollow cylindrical ultrasonic wave, and 6 is formed in close contact with the outside
of the electrostrictive vibrator 5. Heat-shrinkable silicone rubber tube, T: clamp, 8: shaft, 9: set
screw for fixing the shaft 8, 10: feed line, 11: silicone rubber filled in the internal space of the
electrostrictive vibrator 5, 12: The support fitting% 13 is a sound absorbing material% 14a, 14b
mounted inward of the electrostrictive vibrator 5, a binding wire for fixing the feed line 10, and
15 is a bare round terminal. The outside of the cylindrical electrostrictive vibrator 5 is covered
with a heat-shrinkable silicone rubber tube 6, and the sound absorbing material 13 is wound
inside, and further fixed by the support fitting 12, the shaft 8, the press fitting 7, and the fixing
set screw 9. It is done. It is guided to the inside of the cylindrical electrostrictive vibrator 5
through the hole of the feed wire 111 clamp 7, and the shield part is connected to the bare round
insulator 15 and the bare round insulator 15 is fixed by the support fitting 12 through the shaft
8. It is done. ,! The electrode of the cylindrical electrostrictive vibrator 5 of P is attached to the
inside of the cylinder, the two lead wires of this electrode rc2 core shield wire are connected, and
the feed wire 10 is further fixed to the shaft Brc with the bind wire 14a% 14b. Then, silicone
rubber is filled from the hole of the presser 7 so as to be completely waterproof. The water level
detection element having such a structure operates extremely stably against salt water and
sewage because of its coating with silicone rubber, and has excellent durability. Next, the
operation of the water level detection element configured as described above will be described
with reference to FIG. Fig. 3 is a characteristic diagram showing the impedance change of the
water level detection element in air and water, and the characteristic (1) shows the impedance
change in the frequency range where the water level detection element generates antiresonant
vibration in air. . Characteristic (b) H shows the change in impedance when the water level
detection element is immersed in water in the same frequency region. The impedance of the
water level detection element becomes maximum impedance zy at the antiresonance frequency
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fde in air. However, when the water level detection element is immersed in water, the impedance
drops to about-compared to the maximum impedance of 2 de, so if this change is detected, the
position of the water surface can be detected. Here, the cylindrical electrostrictive vibrator. When
used naked without a silicon coating, the impedance at resonance 2.
However, coating with a heat-shrinkable silicone rubber tube lowers the impedance at the time of
antiresonance, and has the advantage that stable operation can be obtained. In the water level
detection element configured as described above, the impedance change occurs only when the
vibration of the water level detection element propagates to water, so if dirt adhesion or the
water level detection element is simply wetted, it is immersed in water and EndPage Since the
change in impedance occurs when the value is not 2, the position of the water surface can be
accurately detected. FIG. 4 is an example of a circuit for converting a change in impedance of the
water level detection element into a DC voltage, and FIG. 5 is an operation explanatory diagram
of FIG. 4 showing the DC voltage, the operating voltage and the state of the detection element. In
FIG. 4, 3 is a water level detection element, which corresponds to the water level detection
element in FIG. 16, an oscillator whose oscillation station wave number oscillates the antiresonance frequency f7 of the cylindrical electrostrictive oscillator, and an anti-resonance
frequency f, the resistance 17t which is equal to two resonance impedances of the water level
detection element at- A voltage is applied to the water level detection element 3. A resistor 18 is
used to discharge the self-induced DC voltage generated when the temperature of the cylindrical
electrostrictive vibrator changes and to stably detect the voltage corresponding to the impedance
change generated at both ends of the water level detection element 30. The excitation voltage
generated across the resistor 200 through the capacitor 19tl is rectified by the diode 21 and the
DC voltage of a magnitude proportional to the AC voltage generated across the water level
detection element 3 by the resistor 22 and the capacitor 23 Converted to V The direct current
voltage V outputs a voltage v4 as shown in FIG. 5 when the water level detection element
resonates at the antiresonance frequency in air, and the voltage V when immersed in water. ?
Output. Also, if the feed # (see FIG. 2) to the water level detection element is shorted, or if the
water level detection element 11 # is shorted, the voltage-all output is performed, and the feed
line is disconnected 7. When the water level detection element is broken and the electrodes are
broken, a voltage VA is output. That is, when a failure occurs in the water level detection element
and normal operation can not be obtained, the voltage v. Or the voltage v6 is output. Therefore,
the voltage vO- or Fiv- can be detected to detect an abnormality of the water level detection
element. Next, an embodiment of a water level detection device using a water level detection
element according to the present invention will be described with reference to FIGS. 5 and 6. FIG.
FIG. 6 is a block diagram showing a circuit configuration of an embodiment of the present
invention. In the figure, reference numeral 24 denotes an oscillation circuit, which corresponds
to the oscillator 16 of FIG.
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Reference numeral 25 is a matching circuit with the water level detection element 3. Reference
numeral 26 is a rectification circuit for rectifying a detection signal. Reference numerals 2T and
28 are output from the rectification circuit 26 as input. Comparison circuits for detecting
abnormality. A comparator circuit for detecting the water level, a synthesis circuit for
synthesizing the outputs of the 3o # i comparison circuit 21.28, a timer circuit for delay
operation according to the output of the 31Fi comparison circuit 29, 32 is a negation circuit, 33
And an abnormality detection output circuit and a water level detection output circuit connected
to the output side of the 34ti combining circuit 30 and the negation circuit 32. In the water level
detection device configured as described above, the excitation voltage from the oscillation circuit
24 is first applied to the water level detection element 3 through the matching circuit 25. The
voltage at both ends of the water level detection element 30 is converted to a DC voltage by the
rectifier circuit 26 and the output is applied to the comparator circuit 27.28 ░ 29. Then, the
comparison circuit 27 sets the comparison voltage to the voltage v11 shown in FIG. 5, and
applies the detection DC voltage V to the in-phase input. Here, when the feed line to the water
level detection element 3 is broken, the load on the oscillator is eliminated and the DC voltage
becomes V-, and a high voltage level abnormality detection signal is obtained as a comparison
output. Further, the comparison circuit 29Fi comparison voltage is set to-and the detection DC
voltage V is added to the negative phase input; at this point, the power supply line can obtain an
abnormality detection signal of a high voltage level as an output. That is, when a failure or
damage occurs in the water level detection element 3, it is added to some one of the comparison
circuits 21 and Ir-128 out-and-out circuits 32. Then, the abnormality detection output circuit 33
is added to a controller such as a sign board (not shown) for detecting the abnormality. Next, the
comparison circuit 29 outputs all the comparison voltages, and this output is set to 4 and added
to the detection DC voltage Vk reverse phase input. When the water level detection element 3 is
immersed in water and the DC voltage drops to a voltage lower than V, a water level detection
signal of a high voltage level is output as an output of the reverse phase. This output is applied to
the timer circuit 31, and when the output continuously exists for, for example, about 10 seconds,
EndPage: 3 is obtained, and the water level detection signal is obtained as the output of the timer
circuit 31. The timer circuit 31 is for preventing the detection signal from being generated when
the water surface moves up and down, and is configured to be variable, for example, from 2
seconds to about 1 minute. The water level detection signal obtained by the timer circuit 31 is
applied to the negation circuit 32. If the abnormality detection signal from the combining circuit
30 is not applied to the negation circuit 32, the water level detection signal is applied to the
water level detection output circuit 34. .
Then, a water level detection signal is output to the pump sign plate or the like by the water level
detection output circuit 34. Here, when the abnormality detection signal is applied to the
negation circuit 32, the water level detection signal is canceled and not output. Two circuits of
the water level detection circuit configured in this way can be provided to issue cautions and
alarms to provide flood information on the road surface. Thus, a water level detection device
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having a function of detecting and outputting a short circuit and open of a feeder to the water
level detection element using an ultrasonic water level detection element including an
electrostrictive vibrator and a fault of the water level detection element and detection circuit Can
be realized. As is apparent from the above description, according to the present invention, the
position of the water surface can be detected stably and stably even in the case of salt water or
sewage, and the reliability and the durability are excellent: The above effect is extremely great. In
addition, detection accuracy for detecting water surface directly. It is extremely effective in that it
is extremely high, and even if the water level detection element or detection circuit fails,
abnormality detection can be output immediately, and a highly reliable water level detection
device for road surface flood detection can be realized. is there.
4. Brief description of the drawings. FIG. 1 is a block diagram showing an embodiment of a water
level detection device according to the present invention, FIG. 2 is a structural view showing an
embodiment of a water level detection element used in the present invention, FIG. FIG. FIG. 5 is
an operation explanatory view of FIG. 2, and FIG. 6 is a block diagram for receiving the circuit
configuration of an embodiment of the present invention. 3 и и и и Water level detection element, 5
fist ? и Electrostrictive vibrator, 6 и и и и и и heat shrinkable silicone rubber tube. 7 и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и silicon rubber, 12 и и и и и и и и и и и и и и и и и и и и и и и и matching circuit , 26 ииииии Rectifier circuit,
21 to 2 g иии Comparison circuit% 30 иии Synthesis circuit, 31 иии Tie. Ma circuit, 32 ... not circuit, 33
... abnormality detection output circuit, 34 ... water level detection output circuit. Patent Assignee
Koito Industry Co., Ltd. Agent Yamakawa Masao et al.-1) Figure 1 Figure 2 End Page: 4 3 I! I
Figure 4 Figure 5 Figure 6 EndPage: ?
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