JPS5829091A - Photoelectric smoke sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a photoelectric smoke detector that has a function that allows the sensitivity to be easily checked from the outside. A phototactic smoke detector has been developed using Such photoelectric smoke detectors have a light-emitting element such as a light-emitting diode installed inside the sensor, and a light-receiving element such as a phototransistor placed in a position where the light emitted from the light-emitting element does not directly shine. When smoke enters the sensor body when a fire occurs, the light emitted from the light emitting element is scattered by the smoke and travels, which is detected by the light receiving element and connected to the sensor line. It is designed to activate a relay. However, in such photoelectric smoke detectors, if the surface of the light emitting element or i-optical element is coated with slag, which reduces the light transmission efficiency, the sensitivity for detecting smoke also decreases. The main point is that the timing of smoke detector activation may be delayed in an emergency. Therefore, conventionally, as shown in Fig. 1, a smoke detector 111Ks
Attempts have been made to periodically check whether the smoke detector (1) is working properly by bringing a smoke emitting object such as an incense stick close to it, but such on-site smoke testing cannot be conducted using open flames. It cannot be carried out in a place, and the test takes time because the electric light does not flow in properly.In addition, since smoke is actually used, there is no need to install a smoke detector ( 1) Medium smoke device (There is a problem that the ml is very easy to get dirty.9) In addition, in such field smoke test, only check the operation of the smoke detector (1) to see if it is working properly. smoke detector fl
) There was a point X where it was impossible to accurately know the 1 degree decrease in sensitivity.

The present invention has been made in order to eliminate the X point of the conventional example, and improves the detection sensitivity of aK smoke from the outside by quickly using fire and without staining the sensor itself with hot water. The purpose of this is to provide a photoelectric smoke detector that can check the following conditions.

The configuration of the present invention will be described below with reference to the illustrated embodiment. Second
The figure is a vertical view of a photoelectric smoke detector (1) according to an embodiment of the present invention, and shows a plan view of the lower cover 14) shown in the third figure. In each of the above figures, +11 is a light emitting unit that has a built-in light emitting element 18) such as a light emitting diode, and irradiates light from the opening window (7) to the area indicated by the diagonal line A. Further, (8) is a light receiving unit disposed perpendicularly to the light emitting unit ill, which includes a built-in light receiving element il+ such as a phototransistor, and has an opening 51! !
It receives light from the area indicated by the diagonal line BK through the tol.In the event of a fire, smoke flows in through the nine inlet holes (11) provided at equal intervals on the periphery of the lower cover (4). , Part C where diagonal line ^ and diagonal line B in Figure 112 overlap
The light receiving unit tel detects the scattering of light in the sensor body (lal).
By activating the relay in Km, a sensing signal from the sensor line Km on the ceiling surface is sent out via the hooking sea link I. According to the present invention, a pair of openings 6@(lal) are provided in the center of the lower part of the lower part 11+41, and each of the openings (11HK) is equipped with an optical fiber αη. (The other ends of 1-I are arranged to face the light-emitting unit area and the light-receiving unit (8), respectively, and the light in the diagonal @A emitted from the light-emitting unit (-) prevents the optical fiber damage η. The light is emitted from the aperture Q@ through the optical fiber. One light emitting unit (@
) is detected as a pulsed light having a predetermined period, and only pulse components having the same synchronization among the outputs of the light receiving unit ts+ are detected.
This makes it possible to prevent malfunctions caused by such external light. In addition, the light receiving surface of the light receiving unit (L) is opposite to the light emitting unit (2) as shown in Figure 2, so that the light emitted from the light emitting unit +81 will not be received by the light emitting unit (2) by mistake. It is slanted towards the direction.

However, IIK, which conducts periodic inspections of photoelectric smoke detectors+1) configured in this way, is equipped with a test light-receiving element like a 7-sister at the tip of one support rod, as shown in Figure 14. A test device having a light-emitting element for testing, such as a light-emitting diode, at the tip of the other support rod 0.
As shown in Fig. 5, insert the tip of the Il! F contact. Accordingly, the pulsed light from the aperture Q@ on the light emitting side is received by the test light receiving element, and the support rod n
A pulse signal is supplied to the main body of the test device and the detection circuit of the cause through the conductor inside the test device. However, if the pulse signal of the lever is higher than a predetermined strength, a drive signal synchronized with the pulse signal is supplied to the test light emitting element field through the conductor wire in the support rod, and the test light emitting element is The emitted light from the element (to) is supplied to the opening on the light receiving side, and is connected to the optical fiber (l).
The pulsed light is transmitted to the light receiving unit (8) through the smoke, and the smoke detector ft) is activated. Therefore, the light-receiving sensitivity of the test light-receiving element and the emission intensity of the test light-emitting element are as follows:
Selector switch a'156 on the test equipment main body? J
The trap is configured so that it can be switched depending on the type of smoke detector (1) by IK. Then, by changing the setting level of this switching cedar switch @ (2), the smoke detector (
K is set so that the sensitivity of 1) can be investigated. Furthermore, the test device (to) shown in Fig. 6 is a pair of support rods (two rods combined into one test rod).
At the upper end of this test rod, a test light-receiving element and a test light-emitting element are housed, and a test container is integrally formed with the test rod.

The present invention is constructed as described above, and includes a light emitting unit that emits pulsed light having periodicity, and a light receiving unit that receives the traveling light scattered by the warmer among the pulsed light. In the sensor, a pair of openings are formed on the outer surface of the sensor, the light emitted from the light emitting unit is emitted from one opening via an optical fiber, and the light incident from the other opening is sent via the optical fiber. Therefore, when the light obtained from the aperture on the light emitting side exceeds a predetermined intensity, pulsed light synchronized with this light is supplied to the aperture on the light receiving side. By doing so, it is possible to test the operation of the smoke detector without using any flame, and it is also possible to test the operation of the smoke detector more quickly and without contaminating the detector than when actually using smoke. In addition, the other end of the fiber is not placed in close contact with the light-emitting unit or the light-receiving unit, but is placed toward the light-receiving unit in the light-emitting unit, so that the light-receiving unit in the light-emitting unit It is possible to know from the outside the decrease in light transmission efficiency due to dirt on the surface of the test device, and by switching the light reception sensitivity and emission intensity on the test equipment side, it is also possible to know even one degree of decrease in the sensitivity of the sensor. It also has the advantage of

[Brief explanation of the drawing]

Figure 111 is a front view of the conventional example, Figure 132 is the present invention,')
Both vertical views of one embodiment, Figure 183 is a plan view of the lower lid of the same as above, Figure 4 is a front view of the test device used in the same as above, sS figure is a front view showing the usage state of the same as above, Figure 1g6 is used in the same as above. FIG. 3 is a front view of another test device. (6) is the light emitting unit, (@) is the light receiving unit, (l is the intelligence circuit unit, α@輛 is the opening, and Oηall is the optical fiber. Daishioiri Patent Attorney Ishi 1) Long Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A light-emitting unit that emits periodic pulsed light, and a light-receiving unit that is placed in a position where the light emitted from the light-emitting unit is not directly irradiated and receives light scattered by smoke that has flowed into the sensor. , a pulsed light seed output circuit that detects only the component of the output of the light receiving unit that has the same period as the light emitted from the light emitting unit, and one end of each of the circuits connected to a pair of openings formed on the outside of the sensor. 1. A photoelectric smoke detector, characterized in that a pair of optical fibers are provided in the sensor, each having an open end and the other end facing a light-emitting unit and a light-receiving unit.