JP2008152809A - Photoelectric fire alarm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric fire alarm device which satisfies responsiveness and electric performance. <P>SOLUTION: This photoelectric fire alarm device has a box-shaped body 33, and a tubular housing 37 which is projected from one side 35 of the body 33 and accommodates a photoelectric sensor inside for measuring smoke density in an atmosphere. It also has a stream lining plate 39 which is provided at an interval from the side 35 of the body 33 so as to cover the housing 37. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fire alarm that is installed in a house or the like and outputs a fire alarm signal to the outside when a fire occurs in the room or the like, and in particular, by detecting the smoke concentration using light. The present invention relates to a photoelectric fire alarm that performs detection or alarm.

  In this type of photoelectric fire alarm, the atmosphere of the alarm installation space taken into the alarm housing is irradiated with measurement light by a light emitting element such as an LED, and is diffused by fine particles present in the atmosphere. The received diffused light is received directly or via a prism or other light receiving element such as a photodiode, and the fire in the alarm installation space is based on the amount of light received corresponding to the concentration of fine particles present in the atmosphere. The presence or absence of occurrence is detected.

  Furthermore, in the case of photoelectric fire alarms, when a fire occurrence is detected in the alarm installation space, a fire alarm signal with a voice or display for notifying the person in the alarm installation space or a fire at a remote monitoring center, etc. The fire alarm signal is output by communication to notify the occurrence of the fire.

  FIG. 10 is a perspective view showing an example of a conventional photoelectric fire alarm. In the photoelectric fire alarm 1, a photoelectric smoke sensor (not shown) is arranged in an atmosphere take-in portion 9 protruding from the housing 5, and smoke generated in the event of a fire or the like is taken in from the slit 7. It has a structure for taking in and detecting in the part 9.

  FIG. 11 is a perspective view showing another example of a conventional photoelectric fire alarm. The photoelectric fire alarm 10 pursues design, eliminates the atmosphere intake 9 protruding from the housing 5 as shown in FIG. 10, and has a smoke sensor (not shown) as a photoelectric sensor inside. A cylindrical sensor housing 14 (not shown in FIG. 11 but shown in FIG. 12) is accommodated in a lower case 11 and an upper case 12 having a flat surface fixed to the lower case 11. It is placed in a case that is formed in a box shape. As shown in FIG. 12, a light emitting element and a light receiving element (both not shown) are arranged in appropriate positions in the inner space of the sensor housing 14, and a large number of slits 14a for taking in smoke are provided on the outer periphery of the cylinder. It has been. Smoke generated in the event of a fire or the like is taken into the case from a slit-shaped opening 11a formed on the entire outer peripheral side surface of the lower case 11, and is detected by the light emitting element and the light receiving element inside the sensor housing 14. .

  However, when the sensor housing 14 is arranged inside the case, there is a problem that the inflow of smoke is deteriorated and the responsiveness is remarkably impaired. That is, in the case, as shown in FIG. 12, in addition to the sensor housing 14 disposed on the substrate 13, there are components such as the lead wire 15 and the battery 16 that hinder the progress of smoke. Does not go smoothly, and as a result, responsiveness deteriorates.

  In the photoelectric fire alarm having the structure shown in FIGS. 11 and 12, for example, when smoke is caused to flow from eight directions as shown in FIG. When the operation time (seconds) from when the alarm is activated to when the alarm is activated is measured, characteristics such as a response graph shown in FIG. 14 are obtained. As can be seen from FIG. 14, the responsiveness in the direction in which components such as the lead wire 15 and the battery 16 that block the progress of smoke are present is deteriorated.

  Further, since it is necessary to provide a large number of openings 11a on the entire outer peripheral side surface of the lower case 11, liquids and foreign substances are mixed into the housing from the openings 11a and adhere to the substrate 13, and the electrical performance ( In particular, there may be a problem that adversely affects current consumption.

  In view of the above-described problems, an object of the present invention is to provide a photoelectric fire alarm that satisfies responsiveness and electrical performance.

  The invention described in claim 1 is a photoelectric device having a box-shaped main body, and a cylindrical housing that is provided so as to protrude from one surface of the main body and accommodates a photoelectric sensor that measures the smoke concentration of the atmosphere. In the type fire alarm, the photoelectric fire alarm is characterized by having a rectifying plate provided at a distance from the one surface of the main body so as to cover the housing.

  According to a second aspect of the present invention, in the first aspect of the present invention, the decorative panel mounting for mounting the decorative panel on a surface of the rectifying plate opposite to the surface facing the one surface of the main body. A portion is formed.

  According to the first aspect of the present invention, a space substantially open to the outside is formed between the rectifying plate attached to one surface of the main body and the one surface of the main body, and the housing of the photoelectric sensor is formed there. Since it is arranged, the housing is exposed to the outside, and the atmosphere flows smoothly into the housing, so that fire detection with good responsiveness can be realized.

  According to the invention described in claim 2, in the invention described in claim 1, it is possible to give interior appearance to the exterior by attaching the decorative panel to the decorative panel mounting portion, and particularly according to the design of the wall surface to be installed. By attaching the decorative panel having the design to the decorative panel mounting portion, it is possible to suppress a sense of discomfort with respect to the wall surface to be installed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing an internal structure of a photoelectric fire alarm device according to a disclosed example of the present invention. In addition to the structure shown in FIGS. 11 and 12, the photoelectric fire alarm of the present disclosure example indicated by reference numeral 1 includes a sensor housing 14 of a smoke sensor, a part of a battery 16 and an LED lead as shown in FIG. Except for the optical tube portion 18, the lead case 15, the other part of the battery 16, and the components such as the substrate 13 (corresponding to electrical elements and mounting parts) are substantially equal in size to the internal area of the lower case 11 A flat cover 17 (corresponding to a partition plate) is fixed inside the lower case 11. The LED light guide tube portion 18 guides light emitted from the LED (light emitting diode) attached to the substrate 13 to a display window 19 (see FIG. 11) formed on the surface of the upper case 12 (not shown in FIG. 1). belongs to.

  As shown in FIG. 2, the cover 17 and the upper case 12 shown in FIG. And a second space B on the opening end side of the lower case 11 (corresponding to the other space inside the case partitioned by the partition plate). The opening 11a of the lower case 11 and the slit 14a of the sensor housing 14 of the smoke sensor face only in the second space B.

  The cover 17 partitions the inside of the lower case 11 into a first space A and a second space B, so that the sensor housing 14 of the smoke sensor, a part of the battery 16 and the second space B Except for the portion of the LED light guide tube portion 18, there are no uneven portions formed by components such as the lead wire 15, other portions of the battery 16, the substrate 13, etc., and the fire monitoring area taken in from the slit-shaped opening 11 a A plane parallel to the flowing direction of the atmosphere (for example, smoke) is formed by the cover 17 and serves as a current plate.

Therefore, in the photoelectric fire alarm 1 having the internal structure shown in FIG. 1, for example, smoke is caused to flow from eight directions as shown in FIG. 13 in the slit-like openings 11 a on the entire outer peripheral side surface of the lower case 11. In this case, when the operation time (seconds) from the start of inflow until the alarm was activated was measured, characteristics such as the response graph shown in FIG. 3 were obtained. As can be seen from FIG. 3, since the components such as the lead wire 15 and the battery 16 that block the progress of smoke are covered with the cover 17, a good characteristic of responding within almost 20 seconds in all directions was obtained. .

  As described above, according to the photoelectric fire alarm device 1 of the present disclosure, the photoelectric fire alarm device has a substantially box-shaped flat appearance in pursuit of design, and the sensor housing 14 of the smoke sensor is built in the case. 10, responsiveness and electrical performance can be satisfied. In addition, since most of the components other than the sensor housing 1 of the smoke sensor are covered by the cover 17, there is no possibility that liquid or foreign matter entering from the side opening 11a adheres to components such as the substrate 13.

  As described above, the disclosure example of the present invention has been described, but the present invention is not limited to this, and various modifications and applications are possible.

  For example, in FIG. 1, the cover 17 is disposed closer to the bottom surface of the lower case 11 so that the opening 11 a of the lower case 11 and the slit 14 a of the sensor housing 14 of the smoke sensor all face the second space B. From this, a part of the battery 16 is not covered with the cover 17, but it is not necessary to make the opening 11a of the lower case 11 and the slit 14a of the sensor housing 14 of the smoke sensor all face the second space B. Alternatively, if the opening 11a of the lower case 11 and the slit 14a of the sensor housing 14 of the smoke sensor are arranged slightly offset toward the opening end side of the lower case 11, a cover is provided so that the battery 16 is completely covered. 17 may be arranged near the opening end of the lower case 11.

  Further, in the above-described disclosure example, the opening 11a is formed in a slit shape, but may be a form as shown in the first embodiment according to the present invention in FIG. That is, in FIG. 4, the photoelectric fire alarm 1 is provided with support columns 20 at the four corners of the cover 17 fixed to the lower case 11, and the upper case 12 is fixed to the support columns 20 with screws 21 or the like. In this case, only the sensor housing 1 of the smoke sensor and the LED light guide tube portion 18 are provided between the cover 17 and the upper case 12, although not shown. The gap between the cover 17 and the upper case 12 between the columns 20 acts as the opening 11a.

  Specifically adopting such a configuration is the photoelectric fire alarm device according to the second embodiment of the present invention shown in the perspective view of FIG. The fire alarm includes a main body 33, a cylindrical sensor housing 37 protruding from the front surface 35 of the main body 33, and a rectifying plate 39 attached to the front surface 35 of the main body 33 so as to cover the sensor housing 37. Have.

  The sensor housing 37 is formed with a slit 37a for taking in the atmosphere over the entire peripheral surface, and inside the sensor housing 37, the installation space of the photoelectric fire alarm 31 taken in from the slit 37a is formed. A light emitting / receiving element (not shown) for measuring the light diffusion amount of the atmosphere is accommodated.

  Note that the measurement result of the light diffusion amount of the atmosphere by the light emitting and receiving element is used to calculate the smoke density of the atmosphere in a microcomputer (not shown) provided in the main body 33, and the microscopic density is calculated based on the smoke density calculated. The computer detects the occurrence of a fire in the installation space of the photoelectric fire alarm 31, and issues an alarm with an indicator 43, a speaker 45, or the like provided on the front surface 35 of the main body 33.

The main body 33 is configured so as to be divided into two parts by a front case 33a and a rear case 33b as shown in a longitudinal sectional view cut at the center in the left-right direction of the main body.
3a and the rear case 33b are mounting screws 36 in which screwing bosses 33c and 33d protruding from the front case 33a and the rear case 33b toward the inside of the main body 33 are inserted from the rear case 33b side. It is attached and fixed by fastening with.

  The main body 33 accommodates a substrate 41 and the like in addition to the microcomputer (not shown) described above. The substrate 41 includes a microcomputer (not shown) and a light emission (not shown) in the sensor housing 37. An electric element (not shown) constituting a circuit related to the light receiving element is mounted, and the microcomputer, the electric element, and the substrate 41 (not shown) correspond to the electric element and the mounting component.

  As shown in FIG. 5, the front surface 35 of the front case 33a, which is also the front surface of the main body 33, has a cylindrical mounting boss 33e (corresponding to a support column) having the same dimensions as the projecting height of the sensor housing 37 from its four corners. ), And a through hole 33f having a locking step portion 33g is formed therein, as shown in FIG.

  The rectifying plate 39 inserts attachment pieces 39a projecting from the four corners of the back surface thereof into the through holes 33f of the attachment bosses 33e of the front case 33a, and snaps the locking claws 39b at the tips of the attachment pieces 39a. By being engaged with the engaging step 33g by the fitting method, the body is fixed to the front surface 35 side of the main body 33, and is disposed at a position separated from the front surface 35 of the main body 33 by the same dimension as the protruding height of the sensor housing 37. The

  In the photoelectric fire alarm 31 of this embodiment, a case is constituted by a portion excluding the front surface 35 of the main body 33, each mounting boss 33 e, and a rectifying plate 39. A partition plate is configured. And the clearance gap between the baffle plate 39 between each attachment boss | hub 33e and the front surface 35 of the main body 33 acts as the opening part 33h.

  In the photoelectric fire alarm 31 of the present embodiment, the first space A inside the main body 33 corresponds to one space inside the case partitioned by the partition plate, and the rectifying plate 39 and the front surface of the main body 33 are The 2nd space B between 35 is equivalent to the other space inside the case partitioned by the partition plate.

  According to the photoelectric fire alarm 31 of the present embodiment configured as described above, it is apparent that the case is constituted by a portion excluding the front surface 35 of the main body 33, each mounting boss 33 e, and the current plate 39. The sensor housing 37 is accommodated in the inside of the main body 33. The sensor housing 37 protruding from the front surface 35 of the main body 33 is substantially exposed to the outside of the case, and the rectifying plate 39 and the front surface 35 of the main body 33 are used. A flow path having an uneven surface is formed, and the atmosphere (for example, smoke) in the fire monitoring area taken in from the opening 33h is smoothly flowed into the slit 37a of the sensor housing 37, whereby a fire with good response. Detection can be realized.

  Moreover, in the photoelectric fire alarm 31 of this embodiment, all of the microcomputer (not shown), the electric elements (not shown) constituting the circuit related to the light emitting / receiving element (not shown) in the sensor housing 37, etc. Since it is housed inside the main body 33 that does not have an opening that allows communication between the inside and the outside, it is possible to prevent liquid and foreign matter entering from the outside from adhering to components such as the substrate 41.

As is clear from the description of the photoelectric fire alarm 31 of the second embodiment, the lower case 11 in the photoelectric fire alarm 1 of the first embodiment shown in FIG. 4 corresponds to the main body 33 in the fire alarm 31 and the upper case 12 in the photoelectric fire alarm 1 of FIG. 4 is the photoelectric fire alarm 3 of the second embodiment.
This corresponds to the current plate 39 in FIG.

  In carrying out the present invention, the external shape of the photoelectric fire alarm need not be limited to a substantially rectangular shape in plan view like the photoelectric fire alarm of each embodiment described above. For example, FIG. 7 and FIG. It may be a substantially circular (substantially elliptical) shape in plan view, like a photoelectric fire alarm 51 according to the third embodiment of the present invention shown in a front view and a side view.

  Incidentally, as shown in FIG. 8, the photoelectric fire alarm 51 of the third embodiment is protruded from a main body 53 that can be divided into a front and a rear by a front case 53a and a rear case 53b, and a front surface 55 of the main body 53. A cylindrical sensor housing 57 and a rectifying plate 59 attached to the front surface 55 of the main body 53 so as to cover the sensor housing 57 are provided.

  The sensor housing 57 is formed with a slit 57a for taking in the atmosphere over the entire peripheral surface. Inside the sensor housing 57, the installation space of the photoelectric fire alarm 51 taken in from the slit 57a is formed. A light emitting / receiving element (not shown) for measuring the light diffusion amount of the atmosphere is accommodated.

  The rectifying plate 59 is provided by columnar mounting columns 53e and 53e that protrude from the left and right sides of the front surface 55 of the front case 53a, which is also the front surface of the main body 53, with the same height as the protruding height of the sensor housing 57. The first space A corresponding to one space inside the case partitioned by the partition plate is formed by the inside of the main body 53, and the rectifying plate 59 and the main body 53 are also formed. A second space B corresponding to the other space inside the case partitioned by the partition plate is formed by a gap with the front surface 55 of the front panel 55. As shown in FIG. 7, rectification between the mounting columns 53e is performed. A gap between the plate 39 and the front surface 35 of the main body 33 acts as the opening 53h.

  The first space A inside the main body 53 accommodates a microcomputer, a substrate (none of which are shown) and the like, like the photoelectric fire alarm 31 of the second embodiment. Are mounted with a microcomputer, an electric element (not shown) constituting a circuit related to a light emitting / receiving element (not shown) in the sensor housing 57, and the like. Corresponds to electrical elements and mounting components.

  Also by the photoelectric fire alarm 51 of the third embodiment configured as described above, the same effect as that of the photoelectric fire alarm 31 of the second embodiment can be obtained.

  According to the photoelectric fire alarms 31 and 51 of the second embodiment and the third embodiment described above, the main body 33 that tends to be uneven due to the presence of the indicator 43 and the speaker 45 and the protrusion of the sensor housings 37 and 57. , 53 are covered with rectifying plates 39, 59 having flat surfaces.

  Therefore, the decorative panel mounting part (not shown) is retracted by about 0.2 to 0.5 mm, for example, leaving the peripheral edge on the surface of the rectifying plates 39 and 59 by utilizing the characteristics of the rectifying plates 39 and 59 having flat surfaces. And install a decorative panel (not shown) of the same design as the wall on which the photoelectric fire alarms 33 and 53 are installed, or another design that matches the wall design. You may enable it to improve the interior property of the installation location which tends to be damaged by installation of the alarm devices 31 and 51.

For example, the photoelectric fire alarm device of the fourth embodiment in which the configuration of the decorative panel described above is applied to the rectifying plate 39 of the photoelectric fire alarm device 31 of the second embodiment shown in FIG. 5 will be described. As shown in the front view of the figure, a recessed decorative panel is formed on the surface 39c of the rectifying plate 39 while leaving its peripheral edge in accordance with the wood-grain decorative panel P on which the photoelectric fire alarm 31A is installed. A wood grain decorative panel 39e can be attached to the portion 39d.

  Then, if the decorative panel mounting portion 39d is configured so that the decorative panel 39e can be repeatedly attached and detached, the decorative panel 39e attached to the decorative panel mounting portion 39d is changed after the change of the installation location of the photoelectric fire alarm 31A. It is also possible to replace with a new decorative panel 39e that matches the design of the wall surface of the installation location.

  Incidentally, the decorative panel 39e attached to the decorative panel attachment portion 39d does not necessarily have to be designed in accordance with the design of the wall surface on which the photoelectric fire alarm 31A is installed. However, if a decorative panel 39e having a design that matches the design of the decorative panel P on the wall surface is attached to the decorative panel mounting portion 39d as shown in FIG. The photoelectric fire alarm 31A with respect to P can be eliminated, which is advantageous.

  Further, the decorative panel mounting portion 39d is not necessarily formed in a concave shape with respect to the surface 39c of the rectifying plate 39, and may be on the same plane as the surface 39c, or in a convex shape protruding one step from the surface 39c. It may be formed.

  And the structure regarding the decoration panel attachment part 39d of the rectifying plate 39 of the photoelectric fire alarm 31A of 4th Embodiment mentioned above is the rectifying plate of the photoelectric fire alarm 51 which concerns on 3rd Embodiment of FIG.7 and FIG.8. In addition to the surface of 59, it can be applied to the surface of the upper case 12 corresponding to the current plate in the photoelectric fire alarm 1 of FIG.

  In each of the above-described embodiments, the photoelectric fire alarms 1, 31, 31A, 51 that output an alarm by the indicator 43 or the speaker 45 when the occurrence of a fire is detected have been described as an example. Needless to say, the present invention can be similarly applied to a fire detector that does not output an alarm by itself but simply detects the occurrence of a fire.

It is a figure which shows the internal structure of the photoelectric fire alarm device which concerns on the example of an indication of this invention. It is the perspective view which looked at the internal structure of the photoelectric fire alarm of FIG. 1 from the side. It is a responsiveness graph which shows the responsiveness of the photoelectric fire alarm of FIG. It is a perspective view which shows the photoelectric fire alarm device which concerns on 1st Embodiment of this invention. It is a perspective view which shows the photoelectric fire alarm device which concerns on 2nd Embodiment of this invention. It is the longitudinal cross-sectional view which cut | disconnected the photoelectric fire alarm of FIG. 5 in the center of the left-right direction of a main body. It is a front view of the photoelectric fire alarm device which concerns on 3rd Embodiment of this invention. It is a side view of the photoelectric fire alarm of FIG. It is a front view which shows the installation state of the photoelectric fire alarm which concerns on 4th Embodiment of this invention. It is a perspective view which shows an example of the conventional photoelectric fire alarm. It is a perspective view which shows the other example of the conventional photoelectric fire alarm. It is a figure which shows the internal structure of the photoelectric fire alarm of FIG. It is a figure which shows the smoke inflow direction which tests the responsiveness of the photoelectric fire alarm of FIG. It is a responsiveness graph which shows the responsiveness of the photoelectric fire alarm of FIG.

Explanation of symbols

1,31,31A, 51 Photoelectric fire alarm 11 Lower case (case, body)
11a, 33h, 53h Opening 12 Upper case (case, current plate)
13 Board (Electrical elements and mounting parts)
14, 37, 57 Sensor housing 14a, 37a, 57a Slit 15 Lead wire (electrical element and mounting component)
16 Batteries (Electrical elements and mounting parts)
17 Cover (partition plate)
20 Prop (case)
33, 53 body (case)
33a, 53a Front case (case)
33b, 53b Rear case (case)
33e Mounting boss (post)
35,55 Front (partition plate)
39,59 Current plate (case)
39c Surface 39d Decoration panel mounting part 39e Decoration panel 41 Substrate (electric element and mounting component)
53e Mounting pillar (post)
A 1st space (one space inside the case partitioned by the partition plate)
B second space (the other space inside the case partitioned by the partition plate)

Claims (2)

In a photoelectric fire alarm having a box-shaped main body and a cylindrical housing that protrudes from one surface of the main body and houses a photoelectric sensor that measures the smoke concentration of the atmosphere,
A photoelectric fire alarm device comprising a rectifying plate provided at a distance from the one surface of the main body so as to cover the housing.   The photoelectric fire alarm according to claim 2, wherein a decoration panel attachment portion for attaching a decoration panel is formed on a surface of the current plate opposite to the surface facing the one surface of the main body. vessel.

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