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DESCRIPTION JPS57182127

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DESCRIPTION JPS57182127
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional level
detector, FIG. 2 is a cross-sectional view of the same level detector in use, and FIG. 3 is an
embodiment of the level detector of the present invention. It is a sectional view showing an
example. 12 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · elastic adhesive, 17 · · · · · · · · Metal diaphragm,
18 · · · · · · · · · · piezoelectric ceramic plate, 19 · · · · · · · · · · · · · · · · · terminal plate, 21 · · · · · · lead
wire.
DETAILED DESCRIPTION OF THE INVENTION The present invention uses a vibrator in which a
piezoelectric ceramic plate is bonded to a metal diaphragm, uses mechanical resonance of the
metal diaphragm and the piezoelectric effect of the piezoelectric ceramic plate, and changes the
resonance resistance. It is an object of the present invention to provide a stable, high-detection
device with low variation in resonance resistance, according to a level detector for detecting the
level of an object to be detected, such as liquid or powder 2 particles in a container. A vibrator
made of a metal diaphragm 4 in which a piezoelectric ceramic plate 3 is attached to the inner
surface of a stepped portion 2 on the upper end face of a case 1 made of metal or composite
252A heat / 2/2 resin as a conventional “ゝ” detector. The peripheral edge portion of 6 is
attached by elastic adhesive 6 such as silicone rubber, and a terminal plate 8 on which a plurality
of terminal elements are planted is connected to the lower surface of case 1. It is connected by
the lead wire 9. With such a configuration, as shown in FIG. 2, the usage state thereof is
incorporated into the opening 12 of the side surface or bottom surface of the container 11
containing the substance 10 to be detected, and the remaining amount level of the substance 10
to be detected in the container 11 is It is detected by the change of the resonance resistance of
the vibrator 6. However, the above-mentioned level detector mounts the metal diaphragm 4 of
the vibrator 5 on the elastic adhesive 6 and then hardens the elastic adhesive 6 to elastically
couple the vibrator 6 to the case 1 If the viscosity of the elastic adhesive 6 is low, the vibrator 6
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sinks and tilts due to its own weight. Conversely, if the viscosity is high, it may be difficult to
apply uniformly to the step 2 of the case 1, partially Detection accuracy is due to the fact that the
vibration of 533 is suppressed and resonance resistance is increased or the vibration state is
changed to cause harmonic oscillation due to the fact that the vibration of 533 is suppressed in
this part. Decrease or become unstable. Further, when the vibrator 6 is inclined or sunk, the
height of the outer periphery of the case 1 and the height of the vibrator 6 are different, and the
substance to be detected 1 o remains on the vibrator 6 to become a large resonance resistance.
Even if the level of the whole detection substance 1 o is lowered, there is a disadvantage that
erroneous detection is performed as if a large amount of the detection substance 10 is present.
The present invention eliminates the above-mentioned conventional drawbacks. Hereinafter, an
embodiment of the present invention will be described with reference to FIG. Reference numeral
12 denotes a case made of metal or synthetic resin. A stepped portion 13 is formed on the upper
portion of the case 12, and the stepped portion 13 is provided with projections 14 with a sharp
tip and a number of force removals. The peripheral portion of the vibrator 16 is positioned and
positioned by the projection 14 and is resiliently coupled by a silicone rubber elastic adhesive 16
applied on the step portion 1354.
The vibrator 16 is constructed by bonding the piezoelectric ceramic plate 18 to the lower surface
of the metal diaphragm 17, and the supporting portion of the vibrator 16 by the projection 14 is
a node when the vibrator 16 vibrates. The increase of the resonance resistance 16 and the
vibration leakage to the case 12 can be reduced. Further, a terminal plate 20 in which a plurality
of terminals 19 are planted is incorporated in the lower surface of the case 12, and lead wires 21
drawn from the electrodes of the piezoelectric ceramic plate 18 of the vibrator 16 are connected
to the terminals 19. . In this configuration, the state of use is identical to that shown in FIG. As
described above, the level detector according to the present invention supports the vibrator by
the projections provided on the steps of the case and then elastically couples the elastic adhesive
with the elastic adhesive, so the relative position between the vibrator and the case is The
vibrator is stable, and the vibrator does not sink against the case), and the substance to be
detected does not stay on the vibrator, and the elastic adhesive sticks out and adheres to the
vibrator. As a result, the vibrator can operate correctly to perform accurate level detection, can
be made reliable, and has great practical value.
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