JP3258294B2 - Fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector, and more particularly to an optical fire detector having a light-transmitting window disposed at a predetermined interval in a tunnel.

[0002]

2. Description of the Related Art Conventionally, tunnels for vehicles and railways,
Various facilities are installed in the tunnel to secure traffic safety. Regarding tunnel equipment for vehicles,
A brief description will be given with reference to the drawings. As shown in FIG. 8, inside the tunnel 20, an illumination lamp 23 such as a sodium lamp for securing a view inside the tunnel 20, a fire detector 24 for detecting a fire occurring in the tunnel 20, Let the evacuees recognize the water spray head 25 that prevents the spread of fire by spraying water, the fire hydrant equipment 26 that houses the water discharge nozzle and hose, the jet fan 27 that ventilates the tunnel 20, the emergency passage and the exit, Various facilities are provided, such as a guide indicator light 28 for guiding, an emergency telephone for notifying an emergency that has occurred in the tunnel 20, a radio rebroadcasting guide line for radio broadcasting, and the like. In particular, fire detector 2
4 is disposed at a predetermined interval, for example, 25 m intervals, on a wall with visibility in the tunnel for the purpose of detecting a vehicle fire or the like in the tunnel 20 and promptly notifying the tunnel manager or the driver of the vehicle. ing.

Next, an example of a conventional fire detector installed in a tunnel will be described with reference to the drawings.
FIG. 9 is a schematic configuration diagram of a fire detector generally used conventionally. The configuration of such a fire detector is described in, for example, Japanese Patent Application Laid-Open No. 7-175986. As shown in FIGS. 9A and 9B, the fire detector 100 includes a light receiving unit (including a detection sensor) 10 that detects radiation light emitted from a flame in the center of a housing (case).
Domed light-receiving glass 10 in which 2a and 102b are stored
1, dome-shaped gloves 103a and 103b are provided around which check lamps (test light sources) 104a and 104b for detecting the dirt state and the like of the light receiving glass 101 by self-diagnosis are housed.

The dome-shaped light receiving glass 101 in which the light receiving portions 102a and 102b are housed protrudes from the inner wall surface 21 of the tunnel, and is provided with the respective light receiving portions 102a and 102b.
Monitors the area AL on the left side of the drawing and the area AR on the right side of the drawing, respectively, with the center line perpendicular to the tunnel inner wall surface 21 as a boundary. The detection sensors in the light receiving units 102a and 102b are installed at an angle of approximately 45 ° with respect to the wall surface in order to increase the detection area in the longitudinal direction of the tunnel. The globes 103a and 103b, in which the check lamps 104a and 104b are stored, are installed near the side of the light receiving glass 101 so as to protrude from the inner wall surface 21 of the tunnel, and the check lamps 104a and 104b are provided for the respective light receiving units 102a and 102b. , The test light CK is periodically emitted to grasp the contamination state of the light receiving glass 101 based on the detection levels of the light receiving units 102a and 102b. Note that, as the test light CK emitted from the check lamps 104a and 104b, a simulated flame light including a wavelength component of the radiant light of the flame is used.

An arrangement of such a fire detector in a tunnel will be described with reference to the drawings. FIG.
It is the schematic which shows the arrangement form in the tunnel 20 of the fire detector 100, and the setting state of a monitoring area (detection area). As shown in FIG. 10, fire detectors 100a, 10a
, 0b, 100c, 100d,... Are located on one side of the inner wall surface 21 of the tunnel 20 at a fixed distance (interval) L.
And, as described above, each fire detector 100
In a, 100b, 100c, 100d,..., predetermined monitoring areas Ax, Ay, Az are set on both left and right sides in the longitudinal direction of the tunnel with reference to the respective installation center lines. Here, each monitoring area Ax, Ay, Az is set so as to include at least the position of the fire detector arranged adjacently,
Each of the monitoring areas Ax, Ay, Az is set to be monitored complementarily by two adjacent fire detectors.

Specifically, each of the fire detectors 100a, 10a
Are arranged at an interval of, for example, 25 m on the inner wall surface 21 of the tunnel on one side, the monitoring area of the fire detector 100b is set to Ax and Ay, and the monitoring area of the fire detector 100c is When Ay and Az are set, the fire detectors 100b and 100c are set so that the monitoring area Ay is to be monitored (complementarily) as a monitoring target. Although the detection area is shown in a plan view in the drawing, a detection area having a three-dimensional spread is actually set. According to such an arrangement of the fire detector, it is possible to suppress the occurrence of a blind spot (shade) in the monitoring area of the fire detector due to a vehicle (obstacle) stopped due to a vehicle failure or the like in the tunnel. Therefore, good fire monitoring can be performed.

When the fire detector is installed on the inner wall surface of the tunnel, the light receiving glass 101 of the fire detector 100 projects from the inner wall surface 21 of the tunnel into the tunnel as described above. This is because the detection sensor is arranged at an angle of about 45 ° with respect to the wall surface for efficient monitoring without generating a non-monitoring area up to the installation position of the adjacent fire detector 100. Inevitably have to protrude greatly into the tunnel. Therefore, as shown in FIG. 11, the light receiving glass 101 is always exposed to the airflow C generated in the tunnel due to the running of the vehicle, the ventilation of the jet fan, and the like. It is well known that there is an air flow C of about 2 m to 10 m / s which flows dominantly in one longitudinal direction in the tunnel. In the tunnel, there are various substances that cause dirt, such as soot and dust emitted from vehicles, chemical substances such as earth and sand, antifreeze, etc.
Since these substances are floating in the airflow, these substances fly in the air stream, and the dome-shaped light receiving glass 101
And directly collide with the airflow upstream of the gloves 103a and 103b and adhere as dirt D. In addition, although dirt adheres to the light-receiving glass 101 other than on the upstream side of the airflow, the degree of dirt is extremely small, about a fraction of that on the upstream side where the airflow directly collides.

[0008] Such contamination of the light receiving glass 101 reduces the amount of light received by the detection sensors in the light receiving sections 102a and 102b housed therein, thereby lowering the detection sensitivity, thereby reducing the performance of the fire detector. Frequent cleaning had to be performed to maintain it for a long time. Therefore, in order to solve such a problem, as shown in FIG. 9, a check lamp (e.g., a test lamp) that emits test light for detecting the contamination state of the light receiving glass 101 is provided around the side of the light receiving glass 101 having a dome shape. Test light source) 104a, 10
In general, a dirt compensation process for arranging the 4b and periodically performing a self-diagnosis to detect a dirt state to compensate for a decrease in detection sensitivity by signal processing is employed. In addition,
A method of avoiding dirt by the dirt compensation processing is described in, for example, Japanese Patent Application Laid-Open Nos. Hei 6-325274 and Hei 5-314.
No. 376, for example.

[0009]

However, in the above-mentioned prior art, various countermeasures against contamination of the light receiving glass have been taken, but a check lamp (test light source) has been used.
Little measures were taken against gloves.

More specifically, (1) Dirt compensation of the fire detector is performed by periodically irradiating test light from the check lamps (test light sources) 104a and 104b to the light receiving units 102a and 102b to thereby clean the light receiving glass 101. Glove 103 in which check lamps (test light sources) 104a and 104b are stored.
If dirt also adheres to the a and 103b, the state of dirt cannot be accurately grasped, making it difficult to appropriately compensate the detection sensitivity of the detection sensor, and the processing for dirt compensation is complicated. There is a problem that it becomes. (2) As is clear from FIGS. 9 and 11, the globes 103a and 103b are formed of hemispherical transparent or translucent glass, and have the light receiving glass 10 inside the tunnel.
Since it is provided so as to protrude similarly to 1, the airflow C generated in the tunnel directly collides and the substance causing the contamination adheres, and the problem (1) becomes remarkable.

SUMMARY OF THE INVENTION In view of the above problems, the present invention minimizes the adhesion of a stain-causing substance to a test light-transmitting window through which test light emitted from a test light source passes, and detects the detection sensor. An object of the present invention is to provide a fire detector capable of favorably compensating for sensitivity.

[0012]

According to a first aspect of the present invention, there is provided a fire detector, comprising: a detection sensor for converting light energy provided in a translucent window into an electric signal; A test light source provided in the vicinity of the test light-transmitting window and provided in the vicinity thereof, and a self-diagnosis test is performed by causing the detection sensor to receive test light emitted from the test light source. In the fire detector for detecting the fire of the above, the test light source is disposed above the height position of the translucent window corresponding to the detection sensor, and is provided so as to protrude inside the tunnel, and the test light source The surface of the test translucent window through which the test light is transmitted is disposed substantially parallel to the longitudinal direction of the tunnel.

[0013] The fire detector according to the second aspect of the present invention,
A detection sensor that converts light energy provided in the light-transmitting window into an electric signal, and a test light source provided in the light-transmitting window for testing provided near the light-transmitting window, In a fire detector for detecting a fire in a tunnel in which a self-diagnosis test is performed by causing the detection sensor to receive test light emitted from the test light source, the test light source transmits light corresponding to the detection sensor. The height of the test window is set higher than the height position of the test window, and is provided so as to protrude toward the inside of the tunnel. 0 ° to
It is characterized by being arranged with an inclination angle in the range of up to 30 °.

[0014] The fire detector according to the third aspect of the present invention comprises:
A detection sensor that converts light energy provided in the light-transmitting window into an electric signal, and a test light source provided in the light-transmitting window for testing provided near the light-transmitting window, In a fire detector for detecting a fire in a tunnel in which a self-diagnosis test is performed by causing the detection sensor to receive test light emitted from the test light source, the test light source transmits light corresponding to the detection sensor. The test translucent window, which is disposed above the height position of the sex window and protrudes inward of the tunnel, and through which test light of the test light source passes, is predominantly in the tunnel. A windshield is provided upstream of the flowing airflow.

The fire detector according to the invention of claim 4 is:
4. The fire detector according to claim 1, wherein the test light source is disposed within a detection area of the detection sensor. 5. A fire detector according to a fifth aspect of the present invention is the fire detector according to any one of the second to fourth aspects, wherein the test translucent window includes:
It is characterized in that the light-transmissive windows are arranged with an equal inclination angle corresponding to the inclination angle with respect to the inner wall surface of the tunnel.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a schematic structural view showing a first embodiment of a fire detector according to the present invention. FIG. 1 (a),
As shown in (b), the fire detector 10 according to the present embodiment
a is roughly divided into a casing (detector main body) 11 and a casing 11.
A sensor storage portion 12 provided at an upper portion, and inclined portions 13a and 13b formed obliquely in both longitudinal directions of the tunnel;
Individual translucent windows (light receiving windows) 14a, 14b provided in each of the inclined portions 13a, 13b, and the respective translucent windows 14a, 1b.
Detection sensor (light receiving element) 15 housed inside 4b
a, 15b, a test light source storage portion 16 formed to protrude in the inner direction of the tunnel, and an individual test light transmitting portion provided in the test light source storage portion 16 corresponding to each of the translucent windows 14a, 14b. Light-transmitting windows 17a and 17b and light-transmitting windows 1 for each test
And test light sources (check lamps) 18a and 18b housed inside 7a and 17b for performing self-diagnosis.

A circuit board and the like (not shown) are housed in the housing 11, and an amplifier circuit for amplifying the signals detected by the detection sensors 15a and 15b, a signal processing circuit for making a fire judgment, and a test light source 18a, A test light source control circuit and the like for controlling the projection of the test light by 18b are mounted. The sensor storage section 12 is provided on the inner surface of the tunnel
Are formed with inclined surfaces 13a and 13b so as to protrude from the inside of the tunnel (upward in FIG. 2 (b)). Detection sensor 15 composed of an electric element or the like
a and 15b are stored.

The inclined portions 13a and 13b are provided in the sensor storage portion 12 protruding from the inner wall surface 21 of the tunnel.
It is located on one side (left side in FIG. 2 (b)) and the other side (right side in FIG. 2 (b)) in the longitudinal direction of the tunnel, and has a predetermined angle with respect to one side and the other side in the longitudinal direction of the tunnel. It is formed obliquely. The translucent windows 14a and 14b are individually provided on the corresponding inclined portions 13a and 13b,
Detection sensors 15a, 15 stored in sensor storage section 12
b is formed of a flat transparent plate for preventing and protecting dirt, damage, etc., and is provided on the inclined portions 13a, 13b in front of the detection sensors 15a, 15b housed in the sensor housing 12. The translucent windows 14a and 14b are made of infrared transmitting glass, for example, sapphire glass.

The test light source storage unit 16 includes the sensor storage unit 12.
In the same manner as in
Is formed so as to protrude in the direction of the inside of the tunnel (upward in FIG. 2B).
Test light sources 18a and 18b including lamps and the like for projecting test light to periodically perform self-diagnosis for b are housed. The test light-transmitting windows 17a and 17b are located on the side of the inclined portions 13a and 13b of the test light source storage unit 16, that is, the test light-source storage units 16
The test light CK emitted from the test light sources 18a and 18b accommodated in the light transmitting windows 14a and 14b can be irradiated to the detection sensors 15a and 15b accommodated in the translucent windows 14a and 14b. It is arranged within the range of each detection area Aa, Ab set by 15a, 15b, specifically, at a position where it does not interfere with the detection area set for actually performing fire monitoring. Here, the test light-transmitting windows 17a and 17b are arranged so as to be located completely above the light-transmitting windows 14a and 14b when the fire detector 10a is attached, and the longitudinal direction of the tunnel, In other words, it is provided so as to form a flat surface parallel to the airflow that flows predominantly in the tunnel.

Next, the operation of the above-described fire detector will be described with reference to the drawings. FIG. 2 is a schematic diagram illustrating a relationship between the sensor storage unit 12 and the test light source storage unit 16 of the fire detector according to the present embodiment and the airflow generated in the tunnel. Here, the description will be made assuming that the airflow generated in the tunnel flows rightward with the left side of the drawing being upstream. As shown in FIGS. 2A and 2B, the inclined portion 13 a of the sensor housing 12 has a constant height at which the height protrudes from the upstream side to the downstream side of the airflow toward the inside of the tunnel. It has a continuously increasing inclined plane. That is, the inclined portion 13a including the translucent window 14a
Is configured to have a predetermined inclination angle (for example, 25 °) with respect to the inner wall surface of the tunnel. In this case, since the airflow C flows along the shape of the inclined portion 13a, a dirt-causing substance flying on the airflow C adheres to the translucent window 14a.

On the other hand, a test light-transmitting window 17 provided on the lower surface of the test light source housing portion 16 protruding inward of the tunnel.
a, 17b are located above the inclined portions 13a, 13b provided with the translucent windows 14a, 14b, and the air flow C
Is provided so as to form a flat surface parallel to the air flow, the air flow C hardly collides directly with the test light-transmissive windows 17a, 17b, and there is almost no accumulation of a dirt-causing substance. Therefore, the translucent window 17 for the test
Adhesion and deposition of a stain-causing substance on a and 17b are greatly reduced. Therefore, the contamination of the test translucent windows 17a, 17b is greatly suppressed, and the test light sources 18a, 18b
To test light-transmitting windows 17a and 17b and light-transmitting window 1
The test light emitted to the detection sensors 15a and 15b via the light transmission windows 4a and 14b is substantially unaffected by the dirt condition of the test light transmissive windows 17a and 17b.
It is detected as a detection level reflecting only the dirt state of 4a and 14b.

Therefore, the fire detector 10 according to the present embodiment
According to a, the adhesion of the stain-causing substance to the test translucent windows 17a, 17b is greatly reduced, and the translucent windows 14a, 14b are reduced.
The dirt condition can be accurately grasped, so that a decrease in the detection sensitivity of the detection sensors 15a and 15b can be appropriately compensated, and a highly reliable dirt compensation process can be performed.
In addition, the test light sources 18a and 18b and the test translucent window 17 are used.
When the fire detector 10a is mounted, the test light source housing 16 provided with the light-transmitting windows 14a,
Since it is arranged so as to be located completely above the installation position of 14b, it does not obstruct the detection area in the direction of the road surface or the inner wall surface below the inside of the tunnel, which is set by the detection sensors 15a and 15b. Can detect fire.

Next, another configuration example in the above-described embodiment will be described with reference to the drawings. FIG. 3 is a schematic configuration diagram showing another configuration example of the first embodiment of the fire detector according to the present invention, and FIG. 4 is a schematic diagram showing the relationship between the fire detector and the airflow in this configuration example. It is. Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 3A and 3B, the fire detector 10b has a sensor storage portion 12 provided on an upper portion of a housing 11 and a curved surface having a predetermined radius of curvature at least in both longitudinal directions of the tunnel. Curved surfaces 19a, 19b formed on the respective surfaces, individual translucent windows 14a, 14b provided on the respective inclined curved surfaces 19a, 19b, and a detection sensor 15a housed inside each translucent window 14a, 14b. ,
15b, a test light source storage part 16 protruding inward of the tunnel, and an individual test light transmitting part provided in the test light source storage part 16 corresponding to each of the light transmitting windows 14a and 14b. The windows 17a and 17b and the translucent windows 17 for each test
Test light sources 18a, 18b housed inside a, 17b
, And is configured.

The sensor accommodating portion 12 is formed in the upper portion of the housing 11 with inclined curved surfaces 19a and 19b so as to protrude from the inner wall surface 21 of the tunnel toward the inside of the tunnel (upward in FIG. 3B). And the inclined curved surfaces 19a and 19b are
It is constituted by a single curved surface having a predetermined radius of curvature, and each has a predetermined inclination (projects) with respect to one side (left side in FIG. 3 (b)) and the other side (right side in FIG. 3 (b)) in the longitudinal direction of the tunnel. (Curved surface). Translucent windows 14a, 1
4b is the sensor housing 12 similar to the above-described embodiment.
The detection sensors 15a and 15b which are formed of a flat transparent plate for preventing and protecting the detection sensors 15a and 15b stored in the
Are provided on the front inclined curved surfaces 19a and 19b.

The test light source storage unit 16 includes the sensor storage unit 12.
In the same manner as in
3b is formed so as to protrude in the direction of the inside of the tunnel (upward in FIG. 3B) with a predetermined radius of curvature, and the test light-transmitting windows 17a, 17b are respectively formed by the light-transmitting windows 14a, 14b.
(Detection sensors 15a, 15b) can be seen through, and are set within the range of each detection area Aa, Ab set by detection sensors 15a, 15b, specifically, to actually perform fire monitoring. It is located in a position that does not interfere with the detection area. Here, the test translucent window 17 is used.
a and 17b are disposed completely above the installation positions of the translucent windows 14a and 14b when the fire detector 10a is mounted, and are disposed in the longitudinal direction of the tunnel, in other words, in the airflow generated in the tunnel. It is provided so as to form a flat surface parallel to the surface.

The fire detector 10b having such a configuration
According to FIG. 4, as shown in FIGS. 4 (a) and 4 (b), since the inclined curved surfaces 19a and 19b constituting the sensor storage portion 12 are formed so as to protrude inward of the tunnel, the airflow C is caused by the inclined curved surface 19a. Flow along the shape of the transparent window 14
The dirt-causing substance flying on the airflow C adheres to the area a. On the other hand, the test translucent windows 17a, 17 provided on the lower surface of the test light source housing 16 protruding inward of the tunnel.
b is the inclined curved surface 1 on which the translucent windows 14a and 14b are provided.
Since the airflow C is located above the airflow surfaces 9a and 19b and is provided so as to form a flat surface parallel to the airflow C, the airflow C directly collides with the test light-transmitting windows 17a and 17b. The test light-transmitting windows 17a and 17
Adhesion and deposition of a stain-causing substance on b are greatly reduced.

Therefore, similarly to the above-described embodiment,
The dirt condition of the translucent windows 14a, 14b can be accurately grasped, and the test light sources 18a, 18b, and
The test light source storage unit 16 provided with the test light-transmitting windows 17a and 17b is disposed so as to be located completely above the light-transmitting windows 14a and 14b when the fire detector 10b is attached. Detection sensor 1
A good fire detection can be performed without blocking the detection area set by 5a, 15b in the direction of the road surface or the inner wall surface below the inside of the tunnel. Also, the sensor storage unit 1
Since the test light source housing 16 and the test light source housing 16 are formed of curved surfaces, it is possible to efficiently and cleanly remove dirt causing substances when cleaning the fire detector 10b.

FIG. 5 is a schematic configuration diagram showing still another configuration example of the first embodiment of the fire detector according to the present invention.
Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 5 (a),
As shown in (b), the fire detector 10c includes a sensor storage portion 12 provided at an upper portion of a housing 11, and an inclined curved surface having a predetermined radius of curvature at least in both longitudinal directions of the tunnel. 19a, 19b and respective inclined curved surfaces 19
a, 19b provided with individual translucent windows 14a, 14b
A detection sensor 15a, 15b housed inside each translucent window 14a, 14b, an individual test light source housing 16a, 16b formed to protrude inward of the tunnel;
Corresponding to each of the translucent windows 14a, 14b, an individual test translucent window 17a, 17b provided in each of the test light source storage sections 16a, 16b, and each of the test translucent windows 17a, 17b.
7b, and test light sources 18a and 18b housed in the inside of the light source 7b.

That is, in this configuration example, the test light source housing 16 is different from the other configuration example (FIG. 3) described above in that
4a and 14b are provided separately so as to protrude from the inner wall surface 21 of the tunnel toward the inside of the tunnel (upward in FIG. 5B). Here, the test light-transmitting windows 17a, 17b are provided with the light-transmitting windows 14a, 14b (detection sensors 15a, 15b), similarly to the above-described configuration example.
And the detection sensors 15a, 15b
Are set within the range of each detection area Aa, Ab set by the above, specifically, at a position that does not cause an obstacle to the detection area set for actually performing fire monitoring. Also,
When the fire detector 10c is attached, the light transmitting window 1
The test translucent windows 17a, 17b are arranged completely above the installation positions of the test light transmission windows 4a, 14b, and are provided so as to form a flat surface parallel to the airflow generated in the tunnel.

The fire detector 10c having such a configuration
According to the above, similar to the above-described configuration example (FIGS. 3 and 4), the adhesion of the stain-causing substance to the test translucent windows 17a and 17b,
The deposition can be significantly reduced, and the contamination state of the translucent windows 14a and 14b can be accurately grasped.
8a, 18b, and the test light source storage unit 16 provided with the test translucent windows 17a, 17b are completely above the installation position of the translucent windows 14a, 14b when the fire detector 10b is mounted. Since it is arranged so as to be located, it is possible to perform fire detection satisfactorily without blocking the detection area set by the detection sensors 15a and 15b in the direction of the road surface or the inner wall surface below the inside of the tunnel. In addition, since the sensor storage section 12 is formed of a curved surface and the test light source storage sections 16a and 16b have a minimum protruding shape, it is possible to more efficiently remove dirt-causing substances when cleaning the fire detector 10b. And it can be performed cleanly.

<Second Embodiment> Next, a second embodiment of the fire detector according to the present invention will be described with reference to the drawings. FIG. 6 is a schematic configuration diagram showing a second embodiment of the fire detector according to the present invention. Here, the same components as those in the above-described embodiment (configuration example) are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 6A and 6B, the fire detector 10 d according to the present embodiment includes the test light-transmitting windows 17 a, 1 provided in the test light source housing 16.
In contrast to 7b, each of the windshields 17c and 17d is provided on the upstream side of the airflow C which flows predominantly in the tunnel.

As described above, each test translucent window 17
Since a and 17b are arranged on the lower surface of the test light source housing 16 so as to form a flat surface parallel to the airflow C which flows dominantly in the tunnel, the airflow C almost never directly collides. However, when the airflow C passes through the surfaces of the test light-transmissive windows 17a and 17b, a small amount of the dirt-causing substance adheres, and The air current C varies in a complicated manner due to various factors such as the size and speed of the passing vehicle, the traffic volume of the vehicle, and the installation status of other equipment around the detector installation position. Translucent window 17a,
It is not possible to completely eliminate the adhesion of the stain causing substance to 17b. Therefore, in the present embodiment, at least the windshield 17c is provided on the upstream side of the test light-transmitting windows 17a and 17b.
By providing 17d, the translucent windows 17a, 1
In the vicinity of 7b, an airflow C which flows dominantly in the tunnel is prevented from passing. Accordingly, the contamination of the test translucent windows 17a and 17b is further suppressed by the contamination of the test translucent windows 17a and 17b in the vicinity of the test translucent windows 17a and 17b. The contamination state of 14b can be accurately grasped, and highly reliable contamination compensation processing can be performed.

<Third Embodiment> Next, a third embodiment of the fire detector according to the present invention will be described with reference to the drawings. FIG. 7 is a schematic configuration diagram showing a third embodiment of the fire detector according to the present invention. Here, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIGS. 7A and 7B, the fire detector 10e according to the present embodiment has the sensor storage unit 12 provided on the upper part of the housing 11 in the above-described embodiment (FIGS. 3 and 4). Similarly to the above, the inclined curved surfaces 19a and 19b formed in a curved shape with a predetermined radius of curvature, and the individual translucent windows 14a and 1b provided on the respective inclined curved surfaces 19a and 19b.
4b, detection sensors 15a and 15b housed in the respective translucent windows 14a and 14b, a test light source housing 16 formed to project with a predetermined radius of curvature, and a translucent window 1
4a, 14b, the test light-transmitting windows 17a, 17b provided in the test light source housing 16 and the test light source housed in each of the test light-transmitting windows 17a, 17b. 18a and 18b.

Here, each test light-transmitting window 17a, 17b
Is a translucent window 14 provided on the inclined curved surfaces 19a and 19b.
Corresponding to the inclination angles of a and 14b, the airflow C is provided at a predetermined inclination angle (obliquely) with respect to the airflow C which flows dominantly in the tunnel. That is, the tunnel inner wall surface 2
1. In other words, assuming that the inclination angle of the translucent windows 14a, 14b with respect to the airflow C dominantly flowing in the tunnel is θ1, the inclination angle θ2 of each of the test translucent windows 17a, 17b.
Are arranged to be equal to or approximate to θ1. Accordingly, the flow of the airflow to the light-transmitting windows 14a and 14b and the test light-transmitting windows 17a and 17b becomes the same, and the adhesion state of the stain-causing substance can be made substantially equal.

Therefore, the stains on the translucent windows 14a, 14b and the test translucent windows 17a, 17b change almost similarly over time, so that the test light sources 18a,
18b, the detection sensors 15a, 15b are transmitted through the test transmissive windows 17a, 17b and the translucent windows 14a, 14b.
The test light applied to b is detected as a detection level reflecting a dirt state approximately twice as high as the dirt state of the translucent windows 14a and 14b. Therefore, the fire detector 1 according to the present embodiment
According to 0e, the detection sensors 15a, 15
b. Since the dirt state of the translucent windows 17a, 17b can be accurately grasped based on the detection level b, the lowering of the detection sensitivity by the detection sensors 15a, 15b is appropriately compensated, and the highly reliable dirt compensation is performed. Processing can be performed.

In the above-described embodiment, the inclination angle θ1 of the light transmitting windows 14a and 14b and the test light transmitting window 17
Although only the point where the inclination angles θ2 of a and 17b are set to be equal or approximate has been described, the setting of the inclination angles θ1 and θ2 has the following restrictions. That is, as shown in the prior art, the translucent windows 14a, 1a
If the inclination angle θ1 of the test light-transmitting windows 4a is set to a relatively large value of about 45 °, the inclination angles θ2 of the test translucent windows 17a and 17b are also set to about the same 45 °. The test light emitted from the test light sources 18a and 18b accommodated in the light transmitting windows 14a and 14b is transmitted through the test light transmitting windows 17a and 17b and the light transmitting windows 14a and 14b.
It may be physically difficult to secure a positional relationship in which the detection sensors 15a and 15b housed in the 14b can be irradiated.

The inventor of the present invention has made intensive studies to solve such a problem, and as a result, the translucent windows 14a, 14b
It has been found that it is preferable to set the inclination angle θ1 to about 30 ° or less. Further, when the inclination angles θ1 of the translucent windows 14a and 14b are set to 0 ° and formed on a flat surface parallel to the airflow generated in the tunnel, the extremely near area of the inner wall surface 21 of the tunnel becomes the blind spot of the detection area. While alleviating this problem, the light-transmitting windows 14a, 14b, in particular, the light-transmitting window 14a
In order to reduce the contamination, it is preferable that the inclination angle θ1 of the translucent window 14a is set in a range of 5 ° to 30 °. Therefore, the translucent windows 14a and 14a as described above are used.
b and the test translucent windows 17a and 17b are made to have the same dirt state, and based on the gist in the present embodiment, the inclination angle θ2 of the test translucent windows 17a and 17b is changed to the translucent window 14a, According to the inclination angle θ1 of 14b, approximately 30
It is desirable to set the temperature below °.

Note that the shapes of the sensor housing and the test light source housing of the fire detector described in each of the above-described embodiments are merely examples, and the present invention is not limited to such an embodiment. In short, at least the test light source is disposed above the height of the light-transmitting window in which the detection sensor is housed, is provided so as to protrude toward the inside of the tunnel, and has a test light source through which the test light from the test light source is transmitted. The light window may have another shape as long as the light window is arranged with an inclination angle of 0 ° to 30 ° with respect to the longitudinal direction of the tunnel.

[0039]

According to the first or fourth aspect of the present invention, a test light source is detected in a fire detector which performs a self-diagnosis test by causing a detection sensor to receive test light emitted from the test light source. The surface of the test light-transmitting window which is disposed above the height position of the light-transmitting window provided corresponding to the sensor, protrudes inward of the tunnel, and through which the test light from the test light source is transmitted. Are arranged almost parallel to the longitudinal direction of the tunnel, so that the adhesion of the substance causing contamination to the test transmissive window arranged in front of the test light source can be suppressed, and the test light to the detection sensor can be suppressed. , It is possible to detect a detection level that reflects only the dirt state of the translucent window.

Therefore, the dirt state of the translucent window can be accurately grasped, so that it is possible to appropriately compensate for a decrease in the detection sensitivity of the detection sensor and to perform highly reliable dirt compensation processing. In addition, since the test light source is disposed above the height position of the translucent window, the test light source does not obstruct the detection area in the direction of the road surface or the inner wall surface below the inside of the tunnel, which is set by the detection sensor. Fire detection can be performed.

According to the second, fourth or fifth aspect of the present invention,
In a fire detector that performs a self-diagnosis test by allowing a detection sensor to receive test light emitted from a test light source, the test light source is moved from the height position of the translucent window provided corresponding to the detection sensor. The test light transmissive window, through which the test light from the test light source is transmitted, is positioned at the top of the tunnel in accordance with the inclination angle of the light transmissive window. Since it is arranged with an inclination angle in the range of 0 ° to 30 ° with respect to the direction, the state of adhesion of the stain-causing substance to the test light-transmitting window arranged in front of the test light source and the light-transmitting window It is possible to make the state of adhesion of the substance causing contamination to the detection sensor substantially equal, and when the test light is applied to the detection sensor, the detection level is detected as a detection level that reflects the state of contamination almost twice as large as the state of contamination of the translucent window. be able to. Therefore, the stain state of the translucent window can be accurately grasped, so that a decrease in the detection sensitivity by the detection sensor can be appropriately compensated, and highly reliable stain compensation processing can be performed.

According to the third or fourth aspect of the present invention, there is provided a fire detector for performing a self-diagnosis test by causing a detection sensor to receive test light emitted from a test light source.
The test light source is disposed above the height of the light-transmitting window provided corresponding to the detection sensor, and protrudes inward of the tunnel, and the test light from the test light source is transmitted therethrough. A windbreak is provided upstream of the airflow that predominantly flows in the tunnel of the transparent window, so that the contamination-causing substance is prevented from coming into the vicinity of the test light-transmitting window, and the test light-transmitting window becomes dirty. Is greatly improved, so that the stain state of the translucent window can be accurately grasped, and highly reliable stain compensation processing can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a fire detector according to the present invention.

FIG. 2 is a sensor storage unit 1 of the fire detector according to the embodiment.
FIG. 2 is a schematic diagram illustrating a relationship between the test light source 2 and the test light source storage unit 16 and an airflow generated in a tunnel.

FIG. 3 is a schematic configuration diagram showing another configuration example of the first embodiment of the fire detector according to the present invention.

FIG. 4 is a schematic diagram showing a relationship between a fire detector and an airflow in the present configuration example.

FIG. 5 is a schematic configuration diagram showing still another configuration example of the first embodiment of the fire detector according to the present invention.

FIG. 6 is a schematic configuration diagram showing a second embodiment of the fire detector according to the present invention.

FIG. 7 is a schematic configuration diagram showing a third embodiment of the fire detector according to the present invention.

FIG. 8 is a conceptual diagram showing tunnel equipment for a vehicle.

FIG. 9 is a schematic configuration diagram of a fire detector according to the related art.

FIG. 10 is a schematic diagram showing a layout of a fire detector in a tunnel and a setting state of a monitoring area in a conventional technique.

FIG. 11 is a conceptual diagram showing a relationship between a fire detector and an airflow generated in a tunnel in the related art.

[Explanation of symbols]

 10a to 10e Fire detector 11 Housing 12 Sensor storage section 13a, 13b Inclined section 14a, 14b Translucent window 15a, 15b Detection sensor 16, 16a, 16b Test light source storage section 17a, 17b Test translucent window 17c, 17d Windbreak 18a, 18b Test light source 19a, 19b Inclined curved surface 20 Tunnel

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiyuki Ozawa 2-10-43 Kami-Osaki, Shinagawa-ku, Tokyo Inside Hochiki Co., Ltd. (56) References JP-A 7-160969 (JP, A) JP-A Sho 61-246897 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 17/12 G01N 21/59 G08B 17/00

Claims (5)

(57) [Claims] 1. A detection sensor provided in a light-transmitting window for converting light energy into an electric signal, and a test provided in the vicinity of the light-transmitting window and disposed in a light-transmitting window for testing. A fire detector for detecting a fire in a tunnel in which a self-diagnosis test is performed by allowing the detection sensor to receive test light emitted from the test light source, wherein the test light source includes the detection sensor. Along with the position above the height position of the translucent window corresponding to, and provided to protrude inward of the tunnel, and the surface of the test translucent window through which the test light of the test light source is transmitted, A fire detector arranged substantially parallel to a longitudinal direction of the tunnel. 2. A detection sensor provided in the light-transmitting window for converting light energy into an electric signal, and a test provided in the vicinity of the light-transmitting window and disposed in the test light-transmitting window. A fire detector for detecting a fire in a tunnel in which a self-diagnosis test is performed by allowing the detection sensor to receive test light emitted from the test light source, wherein the test light source includes the detection sensor. Along with the position above the height position of the translucent window corresponding to, and provided to protrude inward of the tunnel, and the surface of the test translucent window through which the test light of the test light source is transmitted, A fire detector, wherein the fire detector is arranged with an inclination angle in a range of 0 ° to 30 ° with respect to a longitudinal direction of the tunnel. 3. A detection sensor provided in the light-transmitting window for converting light energy into an electric signal, and a test provided in the vicinity of the light-transmitting window and provided in the test light-transmitting window. A fire detector for detecting a fire in a tunnel in which a self-diagnosis test is performed by allowing the detection sensor to receive test light emitted from the test light source, wherein the test light source includes the detection sensor. The height of the translucent window corresponding to the above, and is provided protruding inward of the tunnel, and the tunnel of the test translucent window through which the test light of the test light source is transmitted. A fire detector characterized in that a windbreak is provided on the upstream side of the airflow that flows predominantly inside. 4. The fire detector according to claim 1, wherein the test light source is arranged within a detection area of the detection sensor. 5. The test light-transmitting window corresponds to an inclination angle of the light-transmitting window with respect to an inner wall surface of the tunnel,
The fire detector according to any one of claims 2 to 4, wherein the fire detector is arranged with an equal inclination angle.