JPH04148493A - Smoke detection device - Google Patents

Abstract

PURPOSE:To improve workability in large open space by turning laser beam emitted from a single light source with a rotation control member and executing plane smoke detection so as not to miss the smoke in the large open space. CONSTITUTION:A processing device 4, based on a signal outputted from its built-in pulse generator, judges the time when the optical axis is directed to each reflecting plate 3a to 3f by a rotation control part 2, makes a laser light source 11 of a light emitting/receiving part 1 emit light when the optical axis is judged to be directed to each reflecting plate 3a to 3f and reads in a reflection amount from each reflecting plate 3a to 3f from a light receiving element 12. In such case, by storing past data by each reflection amount of light from each reflecting plate 3a to 3f, the extinction rate of the reflection light can be obtained by each optical axis and the presence of the smoke can be discriminated by these values. When the extinction rate detected in one optical axis, that is, an existing amount of the smoke is beyond the prescribed value, a fire signal is transmitted. Thus, the smoke detection is executed planewise and the workability in the large open space is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a smoke detection device, and in particular to a smoke detection device that can be used in buildings or structures having large spaces.

[Prior art and its problems] Conventionally, smoke detection devices for monitoring fires are of the type that detects smoke that comes to the installation point by installing the smoke detection device on the ceiling, etc. The so-called Subo type that performs detection,
For example, by using light or the like to space the light emitting part and the light receiving part,
There is a so-called separate type that detects smoke that has entered between the emitter and receiver parts, and a so-called separate type that detects linear smoke. When monitoring a large space such as a large building or an i-relic, a large number of these spot-type or separate-type smoke detection devices are installed to detect smoke. Considering the high ceiling as a feature, installing a large number of smoke detection devices is a problem in terms of construction and maintenance.9 Considering the Subol-type smoke detection device, The monitoring range can be covered by using a large number of devices, but in order to detect smoke, it is necessary to wait for the generated smoke to rise to the ceiling surface, and the high ceiling is a structural feature. When you think about it, there is also the problem that it takes a long time for smoke to be detected, making it late to know that a fire has occurred.

In this regard, when using a separate type attenuated type smoke detection device, it is possible to use a large number of smoke detection devices like the suboso l-type and arrange the optical axes of the smoke detection device in a 7-trinkle shape, so that the smoke can be detected two-dimensionally. In addition, in the case of a separate type attenuation type detection device, it can be installed on the side wall of the monitoring location, so there is no need to install it on the ceiling of a high ceiling. Although the drawbacks of molds can be avoided to some extent, there is the hassle of having to install and maintain the light emitter and light receiver as one unit, which are installed at a distance.
This has the disadvantage that, as mentioned above, when a large number of large monitoring spaces are used to cover a large area, problems with construction and maintenance become more and more obvious.

Means for Solving Problem 1] Therefore, the present invention enables smoke to be detected in a substantially planar manner in a large space with a wide monitoring range, and
By detecting the smoke in a two-dimensional manner, it is possible to detect the presence of smoke that has spread over a wide monitoring range, and the problem of workability of the smoke detection device in large spaces can be solved. I have to.

Therefore, according to the present invention, one light source, 51 light receiving sections, a rotation control section that controls the optical axis of the light emitted from the light source to rotate, and a rotation control section that controls the light emitted from the light source to the light receiving section. A smoke detection device is provided, comprising: a plurality of reflecting plates disposed at a turning point of the optical axis so as to reflect the light toward the light receiving section; and a processing section that determines the presence of smoke from the amount of light received by the light receiving section. be done.

According to one aspect, in the above configuration, one light source, two light receiving sections, a rotation control section that controls to rotate the optical axis of the light emitted from the light source, and a rotation control section that controls the optical axis of the light emitted from the light source. a plurality of reflecting plates arranged at the turning point of the optical axis so as to reflect light toward the light receiving section; and a processing section that determines the presence of smoke from the amount of light received by the light receiving section. Two strains are combined on the side.

[Function 7 1a) The optical axis of the e.g. beam from the light source is rotated by the rotation control unit, and the optical axis reflected by the reflection plate is received by the first light receiving unit. The light attenuation rate in the optical path can be determined from the amount of light received at , and smoke can therefore be detected. In this way, for example, the laser beam from one light source is rotated by the rotation control unit, so it is possible to detect smoke in a two-dimensional manner so that no smoke is missed in the university graduate room, and it is also easy to install in large spaces. has also been improved. Furthermore, by providing two systems with the above configuration, the occurrence of smoke can be detected more accurately, such as by detecting diffused smoke and knowing the position where smoke is generated.

Embodiment 1 FIG. 1 is a schematic view from above of the present invention, a) smoke detection device arranged in a monitoring area, and FIG. 2 shows the light emitting/receiving section shown in FIG. 1 and the rotation control unit 2 are shown in detail, and FIG. 3 shows one B of the reflecting plates 3a to 3f shown in FIG. 2 in detail.

As shown in FIG. 1, a light transmitting/receiving section 1 of the smoke detection device of the present invention is installed in a large space S such as a gymnasium or a hall, and a rotation control section is placed on a wall near the light transmitting/receiving section 1. 2
, and reflective plates 3a to 3f are arranged radially on the wall of a large space S centered on the rotation control unit 2. A processing device 4 is shown connected to the light emitting/receiving section 1 and the rotation control section 2 in order to control the rotation of the rotation control section 2 and process the received signals.

As shown in FIG.
j11 and a light receiving element T-12 such as a photodiode, and the optical axes of both are aligned by a half mirror 13.
It is tailored to. The light emitting/receiving unit 1ffj'& axis prevents noise 7 and other noise from entering from the outside via the filter 14.
are doing. The power source of the laser light source 11 is relatively high voltage.
Therefore, it is preferable to use a separate power supply from other devices.

The rotation control unit 2 receives the optical axis of the light emitting/receiving unit 1 via a mirror 21, and rotates a mirror 24 around an axis 23 by a motor unit 22.
By rotating the optical axis, the optical axis is oriented toward the plurality of reflecting plates 3. The reflecting plate 3 represents one of the plurality of reflecting plates shown in FIG. 1, and for example, as shown in the schematic diagram shown in FIG. 3,
A corner cube mirror 33 may be incorporated into the housing 31 via a heater 32 for preventing dew condensation. This reflecting plate 3 has a structure that reflects light in the incident direction even if the reflecting surface is not provided exactly perpendicular to the optical axis. The heater 32 is not required in a well-conditioned space.

The processing device 4 has a built-in pulse oscillator, and controls the pulse emission of the laser light source 11, the light reception timing of the light receiving element 2, and the rotation of the motor unit 22 according to the timing of the pulses output from the pulse oscillator. Light receiving part] 2
The presence of smoke is determined from the amount of light received.

The optical axis of the light emitted from the light emitting/receiving section 1 is rotated by the rotation control section 2 under the control force of the processing device 1, and is directed toward the reflecting plates 38 to 3f shown in h, which are arranged at six locations as an example. It will be done. The processing device 4 controls the optical axis or each reflector 3 . -1-31, and when it is determined that it is directed to each reflector, the laser light source of the light emitting/receiving unit 1]1
The amount of reflected light from each of the reflecting plates 3a to 3f is read from the light receiving element 12. By memorizing past takes for each amount of reflected light from each fouling plate, it is possible to determine the percentage of reduced light reflected from each optical axis, and from that value it is possible to determine the presence of smoke. . If the light attenuation rate detected on the optical axis, that is, the amount of smoke present, is greater than a predetermined value, arbitrary actions such as sending out a fire signal can be taken. Although the reflector plates 3 are provided at six locations in this configuration, it goes without saying that the number can be changed as required.

In addition, as mentioned above, the rate of light attenuation (i.e., the light attenuation rate or the amount of light attenuation) is calculated for each optical axis, and if the amount of light attenuation on any optical axis is greater than or equal to a predetermined value, a fire signal is sent out, etc. However, it may be possible to take action 3, such as adding up the percentage of light attenuation in all optical axes to six overall values, and sending out a fire signal when the total value is greater than a predetermined value. You may also do so. In other words, when monitoring a large space, the ceiling is often high, so the rate of light attenuation on each optical axis is small due to the smoke being diffused.

Even if the rate of light attenuation on each optical axis is small, if the light is attenuated overall, it can be determined that smoke has diffused and is still present. In this case, it is preferable to provide two systems of the above-mentioned configuration in one monitoring area, that is, to perform smoke monitoring from two positions in the monitoring area on one plane using the light emitting/receiving unit and the rotation control unit. This is because if there is only one system, the area between one reflector and the next becomes a non-monitoring area where smoke existing between them cannot be monitored, but if two systems are provided, for example one This is because if the plane is monitored in a matrix, the unmonitored portions can be reduced. Also, if you install two systems and make them in a matrix shape,
By combining the angles of the two systems, it is possible to accurately determine the direction in which the smoke exists, and it is possible to estimate the position of the smoke.

In addition, if the reflecting plates 3a to 3f are arranged in a straight line or continuously in a band shape, the detection range can be further widened, making it easier to detect diffused smoke. In the case where the reflector is made into a belt shape in this way, it is advantageous to replace the reflector 3 with a mirror that is more elastic and easier to bend than the corner cube mirror 33. .

FIG. 1 is a diagram showing another embodiment of the present invention, which differs from the above embodiment in that an additional reflecting plate 3ε is provided near the rotation control section 2. The role of this reflecting plate 3S is to confirm the intensity of the reflected light from the light emitting/receiving section and to use it as a reference for positioning to rotate the optical axis.

That is, the reflector 3s is placed at the front of the reflectors 3a to 3f in FIG. 4, that is, at a position adjacent to the optical axis of the reflector 3a, so that it can be used as a reference for turning the optical axis. The rotating mirror 24 of the rotation control unit 2 is shown in FIG.
will be placed without any distance between them.

In FIG. 4, the reflector plate 3s is shown placed at the front of the reflector plates 3a to 3f as a position not related to smoke detection, but this position is not limited to this. Instead, it may be at another position not related to smoke detection, for example, at the end of the order of the reflectors 3a to 3.
Furthermore, the deviation is sufficient for practical use when the optical axis for detecting smoke is set in a direction away from the optical axis.

In the operation shown in FIG. 1, if the rotation control unit 2 moves the optical axis from left to right, that is, starting from the reflector 3s and moving in the direction of the reflectors 3a to 3f, the reflector as a reference position is By counting the travel time of the optical axis from 3s using pulses, etc., the position at 3 to each reflecting plate 3a can be known more accurately.When the position of each reflecting plate is reached, the processing device 1 , laser light source] to emit laser light.

Further, the reflection plate 3s is arranged close to the rotating mirror 24 of the rotation control unit 2 so that the laser light from the laser light source 11 can be completely reflected and received by the light receiving element 12. Therefore, when the optical axis is directed toward the reflecting plate 3S and the light receiving element 12 receives the entire amount of light emitted from the laser light source 1, it is possible to check the intensity of light emitted from the corresponding light source 11. This makes it possible to reliably detect, for example, a case where the amount of light emitted by the laser light source has decreased to such an extent that smoke cannot be detected due to aging.

[Effects of the Invention] As described above, according to the present invention, one light source, one light receiving section, and a plurality of reflecting plates are provided, and the optical axis of light emitted from the light source is reflected by each reflecting plate. Since the optical axis is rotated by the rotation control unit so that the light is received by the light receiving unit, it is possible to detect smoke in a two-dimensional manner so that no smoke is missed in a large space, and it is easy to install in a large space. It is said that it was effective during the Song Dynasty to significantly improve the situation.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating a case where the smoke detection device according to the present invention is installed in a large space, FIG. 2 is a schematic configuration diagram showing the smoke detection device according to the present invention, and FIG. 3 is a board-
・A diagram schematically showing a configuration example, FIG. 4, is another diagram of the present invention.
FIG. 3 is a diagram showing two examples. In the figure, 1 is a light emitting/receiving unit, 11 is a laser light source, 2 is a light receiving element, 2 is a rotation control unit, 22 is a motor unit, 24 is a rotating mirror, 3.3a-3f and 3s are reflection plates, 4 is a processing It is a device. Patent applicant Nomi Disaster Prevention Co., Ltd. Figure Reflector 3 Figure 4

Claims (2)

[Claims] (1) one light source, one light receiving section, a rotation control section that controls the optical axis of the light emitted from the light source to rotate, and a rotation control section that controls the light emitted from the light source toward the light receiving section. A smoke detection device comprising: a plurality of reflecting plates disposed at a turning point of the optical axis so as to reflect the light; and a processing section that determines the presence of smoke based on the amount of light received by the light receiving section. (2) one light source, one light receiving section, a rotation control section that controls the optical axis of the light emitted from the light source to rotate, and a rotation control section that controls the light emitted from the light source toward the light receiving section. Two or more systems are combined, each of which includes a plurality of reflecting plates disposed at the turning point of the optical axis so as to reflect the light, and a processing section that determines the presence of smoke from the amount of light received by the light receiving section. The smoke detection device according to claim 1.