JPS5848611Y2 - Smoke detector with operation test device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a smoke detector with an operation test device.

For conventional light-scattering type smoke detectors, simulated operation tests are conducted using smoke generation testers such as incense sticks at the sensor installation site to confirm the operation of the detector during enforcement tests, periodic inspections, etc. was doing.

Therefore, it is necessary to keep the smoke generation tester close to the sensor until the sensor is activated, and it is also necessary to exhaust smoke from incense sticks etc. that has entered the sensor, which makes the sensor operation test less rapid. In addition, it was extremely troublesome to have to generate and exhaust smoke.

The present invention was developed in view of the above points, and its purpose is to generate and exhaust smoke at the sensor installation site by installing an optical fiber and passing light through the optical fiber. There is no need to
Further, it is an object of the present invention to provide a smoke detector with an operation test device, which does not require a smoke generation tester to be kept close to the sensor until the sensor is activated, and allows the operation test of the sensor to be carried out very simply and quickly.

The present invention will be explained in detail below using examples.

The smoke sensing part 1 is a light-shielding tube 7A provided at the center inside the case 7.
It has a dark box structure surrounded by.

Inside the light-shielding tube 7A, a light-emitting section 5 provided with a light-emitting element 5A and a light-receiving section 6 provided with a light-receiving element 6A are installed separately, and a light emitting window 5B is provided in front of the light-emitting element 5A. A light receiving window 6B is opened in the front part of the element 6A.

Light emitted by the light emitting element 5A is scattered by smoke particles through the light projecting window 5B, and is received by the light receiving element 6A through the light receiving window 6B, and the output is amplified to control the switch circuit and issue a fire alarm.

A columnar space 2 is provided below the smoke sensing section 1.

The upper part of the space part 2 communicates with the smoke sensing part 1.

A cylindrical smoke introduction part 3 whose upper and lower surfaces are partitioned is provided on the circumferential side of the space 2.

As shown in Fig. 2, labyrinths 4 meandering radially in a wavy manner from the inner circumferential edge to the outer circumferential edge are erected in the smoke introduction part 3 at appropriate regular intervals over the entire width between the upper and lower sides, so that outside light can flow into the space 2. ,
This prevents smoke from entering the smoke sensing section 1.

An insect screen (not shown) is attached to the outer periphery of the smoke introduction part 3.
It is possible to prevent malfunctions due to the entry of insects.

An outer cover 14 is attached to the lower surface of the smoke introduction part 3 and the space part 2 to prevent outside light from entering.

The optical fiber 8 is a bundle of ultra-fine glass fibers that has good light transmission properties and is highly flexible.It utilizes the phenomenon in which light travels through a cylinder of thin glass fibers while being refracted. The signal is transmitted to the other end.

One end of the optical fiber 8 is made to protrude into the smoke sensing part 1 as shown in FIGS. 1 and 2, and is not made to face the light emitting part 5 but to face the light receiving part 6.

The other end of the optical fiber 8 is sealed to prevent light from entering through the outer cover 14 of the space 2, and is projected to the outside of the sensor A.

A part of the optical fiber 8 is cut in the lower part of the space 2 which is the middle part of the optical fiber 8, and an S pole and a N pole are attached to both ends of the optical fiber 8 in a balance shape, which swings by the support 11 as shown in FIG. A shielding plate 10.10 made of a permanent magnet is arranged so that it can freely shield the cutting portion 9 by magnetic force.

Usually, either the S-pole or the N-pole shielding plate 10 shields the cut portion 9 of the optical fiber 8 as shown in FIG.
The light receiving section 6 is prevented from malfunctioning due to external light.

In order to operate the sensor A, as shown in FIG. 4, a part of the field tester 12 with a magnet having the same polarity as the shielding plate 10 is brought close to the outside of the cutting part 9 of the space 2 of the optical fiber 8.

Then, as shown in FIG. 4, the shielding plate 10, which is oscillated by the magnetic force at the cutting part 9 of the optical fiber 8, is repelled by the magnetic force and moves to release the shielding of the cutting part 9.

Therefore, external light from the other end of the optical fiber 8 protruding to the outside of the sensor A is continuously refracted inside the optical fiber 8 and passes through the cut section 9 to the light receiving section 6 of the smoke sensing section 1.
It is transmitted to one end opposite to the other.

The external light that has entered from one end of the optical fiber 8 is received by the light receiving element 6A of the light receiving section 6, and the operation of the sensor A can be confirmed.

Therefore, in the present invention, the operation of the sensor A can be easily and quickly tested by using the field tester 12 equipped with a magnet in the vicinity without emitting any smoke such as incense sticks.

Also, after confirming the external light sensing operation using the light receiving unit 6,
When the polarity opposite to the shielding plate 10 of the field tester 12 with magnet is brought close, the oscillating shielding plate 10 shields the cut portion 9 of the optical fiber 8 again, and the optical fiber 8
This shields the light receiving section 6 from being irradiated with external light entering from the other end.

Therefore, unlike conventional methods, there is no need to exhaust the emitted smoke, and the on-site tester is connected to sensor A until sensor A is activated.
There is no need to keep it close to.

The present invention provides a smoke detector with an operation test device that does not require emitting or discharging smoke as described above, and allows for a simple and quick operation test of the sensor. Both ends of the scale-like structure, which is oscillated by a column installed in the sensor, are set as S and N poles, and a shielding plate made of a permanent magnet is arranged so as to freely shield the cut part, and an optical fiber is used to connect the outer Since light is introduced, simply by bringing the same polarity part as the shielding plate of the magnetic field tester close to the outside of the sensor, the shielding plate can be repelled by magnetic force and the shielding of the cutting part can be released. Since a special drive device such as an electromagnetic device is not required to drive the shield plate, the operation test device can be incorporated even in a small smoke detector with a small internal space. Since it is introduced into the sensor, there is no need to provide a light source inside, so there is no need for maintenance and management of the winding source, and the cost is also low.

[Brief explanation of drawings]

Fig. 1 is a partially omitted schematic side sectional view of an embodiment of the present invention, Fig. 2 is an enlarged plan sectional view taken along arrow A-A in Fig. 1, and Fig. 3 is a cut section of the same optical fiber. FIG. 4 is a partially omitted enlarged schematic perspective view of a state where the field tester with a magnet is brought close to the cut section of the same optical fiber, in which 1 is a smoke-sensing section, and 5 is a light-emitting section. 1.6 is a light receiving section, 8 is an optical fiber, 9 is a cutting section, 10 is a shielding plate, and A is a sensor.

Claims (1)

[Scope of utility model registration request] One end of the optical fiber does not face the light emitting part provided in the smoke sensing part, but faces the light receiving part of the smoke sensing part, which receives light by light scattering, and the other end of the optical fiber protrudes outside the sensor. A cut part is formed by cutting the optical fiber midway, and a shielding plate made of a permanent magnet is attached to the cut part, with the ends of the scale-like shape having S and N poles swinging by a column installed in the sensor. A smoke detector with an operation test device arranged so that it can be shielded freely.