JPS5926470Y2 - Combined smoke detector - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a composite smoke detector that combines an ion type and a rechargeable type, and particularly relates to a structure in which an ion type smoke detector is arranged in the same smoke monitoring space.

Next, an embodiment of this invention will be described in detail based on the drawings.

FIG. 1 is a partially cutaway plan view showing an embodiment of the composite smoke detector of this invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1.

There is a smoke monitoring space 3 adjacent to the inspection entrance 2 of the dark box 1, and a light source 4 and a light receiving element 5 are arranged across this smoke monitoring space 3.

A hood 6 is provided in front of the light source 4 and is provided with a through hole 61 that restricts light rays to pass therethrough to prevent noise light from entering the light receiving element 5.

The light-receiving element 5 is arranged at a position where direct light from the light source 4 does not enter, and furthermore, a light-shielding plate 7 having a slit 71 is provided in front of the light-receiving element 5 to block excess reflected light.

A first electrode 1 forming a measurement ion chamber 8 and a comparison ion chamber 9 is disposed between the hood 6 of the light source 4 and the light shielding plate 7.
0 and a second electrode 11 and a third electrode 12 with a radiation source 13
is provided.

The second electrode 11 is provided with a (L14) that transmits the radiation from the radiation source 13, and is configured so that the comparison ion chamber 9 and the measurement ion chamber 8 are simultaneously ionized by the single radiation source 13.

In the composite smoke detector configured as described above, when smoke enters through the inspection entrance 2 of the dark box 1, the smoke immediately reaches the smoke monitoring space 3 near the inspection entrance 2, and the photoelectric and ion The type smoke detection mechanism is operated in a known manner.

The rechargeable type has the function of highly sensitive smoke detection for non-flaming smoke, and the ion type has the function of highly sensitive smoke detection for flaming smoke. Depending on the various ways in which smoke is generated by flames, either the rechargeable type or the ion type smoke detection function can work sensitively.

In the structure of the combined smoke detector of this invention, a smoke monitoring space 3 is provided close to the inspection entrance 2 of the dark box 1, and the same smoke monitoring space 3 is shared by the photoelectric type and the ion type. ,
A light source 4 and a light receiving element 5 are arranged across a smoke monitoring space 3,
Since the measurement ion chamber 8 and the comparison ion chamber 9 are provided between the light source 4 and the light receiving element 5, various types of smoke caused by a fire can be effectively removed.
In addition, detection can be performed with high sensitivity, and the entire sensor can be made smaller.

Furthermore, the light beam from the light source 4 is transmitted to the first electrode 10 and the second electrode 1.
1. A hood 6 is provided on the light source 4 side to prevent noise light from being reflected by the third electrode 12 and the like and entering the light receiving element 5.
Since the light-shielding plate 7 having the slits 71 serving as optical traps is provided on the light-receiving element 5 side, it has excellent effects such as being able to effectively block noise light.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing an embodiment of the composite smoke detector of this invention, and FIG. 2 is a cross section taken along the line A--A in FIG. 1. 1...Dark box, 2...Entrance for public prosecutors, 3...Smoke monitoring space, 4...Light source, 5...Light receiving element, 6...Hood,
7... Light shielding plate, 8... Measurement ion chamber, 9... Comparison ion chamber, 10... First electrode, 11... Second electrode,
12...Third electrode, 13...Radiation source.

Claims (1)

[Scope of utility model registration request] In a composite smoke detector in which a rechargeable and ion type smoke detector is installed in a dark box with an entrance to the inspector, a smoke monitoring space is provided near the entrance to the inspector, and a light source is installed across the smoke monitoring space. and a light-receiving element is placed at a position where direct light from the light source does not enter,
A composite smoke sensor characterized in that a first electrode forming a measurement ion chamber and a comparison ion chamber and a third anode having a second electrode radiation source are provided between the light source and the light receiving element.