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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are both longitudinal side views of an
embodiment of an ion fire sensor with a piezoelectric buzzer 'YET according to the present
invention. 1 ...... base, 2 ...... smoke penetration hole. 3 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и radiation source, 5, 7 и и и и и и и и и electrodes. 6 иииииииииииииииииииииииииииии External ion chamber. 9 и и и и
и и Piezoelectric elements, 11 и и и и и и и и и Circuit parts. 13 ииииииии Tubular cross column.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iono-type fire
sensor having a piezoelectric buzzer. (21 Fire detectors with conventional piezoelectric buzzers
have the disadvantages of complex structure and large size because the fire detector part and the
piezoelectric buzzer part are separately configured and incorporated in the same housing was
there. SUMMARY OF THE INVENTION The present invention provides an ion fire sensor having a
piezoelectric buzzer which is simple in structure and small in size. An embodiment of the present
invention will now be described with reference to the drawings. In FIG. 1, a housing 8 having a
large number of invading holes 2 is inserted under the base l, and the housing B is mounted with
a base IIII. An intermediate electrode 5 having a radiation # 4 'is provided. An opening 6 is
provided on the bottom surface of the housing 8 facing the intermediate electrode 5, the external
electrode 7 is conductively attached to the opening 6, and the housing 8 is also formed as an
electrode to form an external ion chamber 8. Be done. The piezoelectric element 9 is bonded in
an insulating manner on the top surface of the external W pole 7 to form a vibrating portion of a
piezoelectric buzzer using the electrode 7 as a lifting plate. An internal ion chamber 10 is
provided inside the upper side of the base 1 and a circuit component 11 such as a sensing (8)
device or a piezoelectric buzzer is accommodated. The external electrode 7 and the piezoelectric
element 9 are connected to the circuit component 11 by a connection connector 12 or the like.
FIG. 2 shows another embodiment of the present invention, wherein the same parts as in FIG. 1
are indicated by the same symbols. In this embodiment, the cylindrical support 18 provided with
the bottom surface of the minute body 8 is provided with a ? ии == protrusion, and the external 1
[1 j 7 having the piezoelectric element 9 provided on the cylindrical support 18 is supported. Be
done. The opening 6 surrounded by the cylindrical support 18 is used both as a smoke
penetration hole and an acoustic hole. The other configuration is the same as in FIG. The
piezoelectric element 9 may be provided on the external II pole 7 and the piezoelectric element 9
may be provided together with the intermediate electrode 5 on the cylindrical support pillar
provided on the base l in the above two embodiments. In this case, the smoke entry hole 2 is also
used as an acoustic hole. According to the present invention, as described above, a piezoelectric
element is provided on one of the pair of electrodes provided in the external ion chamber of the
ion fire sensor, and the ion current detection electrode is also used as the diaphragm of the
piezoelectric buzzer (4) The structure is simple because the structure is simple, and the circuit
part of the #piezoelectric buzzer is accommodated in the base to be small, and it is said that it is
dirty. , Mu! ei ? ? ? ? ? ? ? m 5 m 5 ?6 и 1711 has the advantage of being able to be used
as a single point [? ? ?.
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