JP7199166B2 - fire detector - Google Patents

Description

The present invention relates to a fire sensor that senses smoke and heat from a fire.

Fire detectors include smoke detectors that detect fires by introducing smoke from fires and heat detectors that detect fires by introducing hot air currents from fires.
An example of a smoke sensor is disclosed in Patent Document 1, for example. It has a top plate supported by a pillar, and the space between the top plate and the main body serves as a smoke introduction section for introducing smoke. In this example, the diameter of the top plate is set to approximately half the diameter of the main body.
In addition, an insect net is provided on the inside of the column to protect against insects so as to surround the smoke introduction part.

Another example is the alarm device disclosed in Patent Document 2, for example. The housing of this alarm device is composed of a base portion fixed to an installation surface such as a ceiling or a wall, and a body portion detachably locked to the base portion. The main body is formed by integral molding of resin, and has a circular frame shape with a bottom. An introduction opening is provided, and the opening is provided with a vertical bar and a horizontal bar.
The diameter of the top plate is formed substantially equal to the diameter of the base portion.

JP-A-6-124390 JP 2010-39936 A

The above two examples of the appearance of the fire detector have been given, but the common point in these cases is that the top plate (top plate) is provided below the main body or base via vertical or horizontal bars. It is An opening is provided between the top plate and the main body, and smoke or hot air is introduced through the opening to detect fire.

By the way, in recent years, design is required for disaster prevention equipment installed indoors of buildings. A fire detector, which is a kind of disaster prevention equipment, is installed on a ceiling surface or the like. In general, the ceiling surface is white, so in order to make the fire detector inconspicuous, the housing of the fire detector should be the same color as the ceiling surface, etc., or a color close to white. there is

However, in the conventional fire detectors exemplified in Patent Documents 1 and 2, there is an opening between the top plate (top plate) and the main body or between the top plate (top plate) and the base portion, and the opening has A stanchion or longitudinal beam is provided.
Further, in the smoke sensor of Patent Document 1, an insect net is provided at the opening to prevent insects from entering the interior.
Since the inside of the opening is shaded, the inside of the opening appears black when viewed from below. Therefore, even if the color of the main body and the top plate is unified to white, the opening portion looks black and looks like a so-called two-tone color.
In addition, when an insect screen is provided, the insect screen is silver, and in this case also, there is a problem that the sense of unity as a whole is lost and the design is hindered.
As described above, in the conventional fire sensor, since the opening for introducing smoke and hot air can be seen even from below, there is a problem that it is difficult to improve the design.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a fire sensor that can be excellent in design by making it difficult to see the opening for introducing smoke and hot air when viewed from below. It is intended to

(1) A fire sensor according to the present invention is a fire sensor that is attached to a mounting surface and detects a fire,
A top plate is provided below the main body via a support column, and an opening is formed between the top plate and the main body for introducing airflow such as smoke and hot airflow into the main body. ,
The top plate is provided so as to protrude outward from the support, and the length of protrusion from the support is set to be equal to or greater than the height of the opening.

(2) In addition, in the apparatus described in (1) above, the main body portion has an overhanging surface that overhangs the post, and the surface of the main body portion including the overhanging surface and the surface of the top plate A pattern is printed or transferred on the surface.

(3) Further, in the apparatus described in (1) or (2) above, an uneven portion for adjusting the flow of the air current is provided on at least the upper surface of the projecting portion of the top plate. .

(4) In addition, in any one of the above (1) to (3), the opening is arranged above the top plate so as to face the projecting surface of the top plate and cooperates with the top plate. It is characterized by providing an air guide plate for guiding airflow such as smoke and hot airflow to the part.

(5) Further, in the apparatus described in (4) above, the air guide plate is a light guide in which an outer peripheral end surface of the air guide plate functions as a confirmation light.

(6) A fire sensor according to the present invention is a fire sensor that is attached to a mounting surface and detects a fire by smoke,
A top plate provided below a main body, an opening provided between the top plate and the main body for introducing smoke into the main body, and an insect screen provided in the opening. death,
The top panel is provided so as to protrude outward beyond the insect net, and the length of protrusion from the insect net is set to be equal to or greater than the height of the opening.

The fire sensor according to the present invention has a top panel provided below a main body via a support column, and between the top panel and the main body, an air flow such as smoke or hot air is passed to the main body. An opening for introduction is formed, the top plate is provided so as to protrude outward from the support, and the length of protrusion from the support is set to be equal to or greater than the height of the opening. When the fire sensor is viewed from below, the opening is blocked by the overhanging part of the top plate, so that the opening is difficult to see and the design of the appearance is not hindered by the opening. Therefore, the appearance of the fire sensor can be made excellent in terms of design.

1 is a perspective view of a fire sensor according to an embodiment of the invention; FIG. 2 is a side view of the fire detector shown in FIG. 1; FIG. FIG. 2 is an exploded perspective view of the fire sensor shown in FIG. 1; FIG. 3 is an explanatory diagram of a method of setting the length of projection of the top plate in the fire sensor shown in FIG. 1; 1. It is explanatory drawing of the uneven|corrugated|grooved part provided in the inner surface of the top plate of the fire sensor shown in FIG. 1 (the 1). It is explanatory drawing of the uneven|corrugated|grooved part provided in the inner surface of the top plate of the fire sensor shown in FIG. 1 (part 2). FIG. 2 is a diagram showing a comparison of the appearance of the fire sensor shown in FIG. 1 with a conventional example; 1. It is explanatory drawing of the removal method from the base of the fire sensor shown in FIG. 1 (the 1). It is explanatory drawing of the removal method from the base of the fire sensor shown in FIG. 1 (the 2). FIG. 3 is an explanatory diagram of a method of printing on the main body of the fire sensor shown in FIG. 1; It is explanatory drawing of the printing method to the top panel of the fire sensor shown in FIG. FIG. 10 is an explanatory diagram for explaining a problem when printing on a conventional case; It is a figure which shows the state which printed the checkered pattern on the surface of the fire sensor shown in FIG. 1 (the 1). It is a figure which shows the state which printed the checkered pattern on the surface of the fire sensor shown in FIG. 1 (part 2).

Although the present embodiment will be described with reference to the drawings, each drawing is for explaining the features of the present invention, and parts that are not necessary for the explanation of the invention are shown in a simplified form.
In the following explanation, "up" and "down" are the directions when the fire detector is attached to the ceiling, "up" is the ceiling side, and "down" is the floor side. is.

The fire sensor 1 of the present embodiment is a smoke sensor that is attached to a mounting surface such as a ceiling surface and detects a fire by detecting smoke, for example. It has a body portion 5 detachably attached to a fixed base 3 (see FIG. 4), and a top plate 9 provided below the body portion 5 via a column 7. The top plate 9 and the body portion 5 An opening 11 for introducing airflow such as smoke and hot airflow into the main body 5 is formed between them.
Further, an air guide plate 13 is provided above the top plate 9 so as to face the projecting surface of the top plate 9 and guide smoke to the opening 11 in cooperation with the top plate 9 .
Each configuration will be described in detail below.

<Body part>
The body portion 5 is detachably attached to a base 3 fixed to an attachment surface such as a ceiling surface. As shown in FIG. 3, the main body 5 has a circular opening 15 on its lower surface, and a smoke detector 17 made up of a labyrinth or the like is provided in the main body 5 . A substrate 19 is provided on the upper end surface of the smoke detection section 17, and two LEDs 21 serving as light sources for confirmation lights are installed on the outer periphery of the lower surface of the substrate 19. As shown in FIG.
In addition, an insect net (not shown) is provided on the outer periphery of the smoke detector 17 .

In addition, the main body part 5 has an overhanging surface 22 that overhangs the strut 7, and this outer surface has a shape with as little inclination as possible so that a pattern or the like can be printed with a printer such as an ink jet printer. is preferred.

<Top plate>
The top plate 9 is a flat circular plate provided below the main body 5 via a support 7 . Of course, the top plate 9 is not necessarily flat, and may have a curved shape. is preferably Instead of printing, a sealing member such as a cutting seal may be attached, and even in that case, the top plate 9 and the main body 5 should preferably have a flat surface or a shape close to a flat surface.

Further, the top plate 9 may be formed integrally with the housing constituting the body portion 5, or may be attached to the body portion 5 as a separate component. However, if the top panel 9 and the main body 5 are integrally molded, it is difficult to print with a printer such as an ink jet printer.

The top plate 9 is provided so as to protrude outward (horizontally in the mounted state) from the support column 7 that supports the top plate 9, and the protrusion length L from the support column 7 is equal to or greater than the height H of the opening 11. is set (see FIG. 2).
By setting the overhang length L in this way, when the fire sensor 1 is viewed from below, the opening 11 is hidden by the top panel 9 and becomes difficult to see, and the opening 11 does not hinder the appearance. , the appearance of the fire sensor 1 can be improved in terms of design.

In addition, the fire sensor 1 of the present embodiment is a smoke sensor, and is provided with an insect screen as described above. In this case, if the insect screen is visible, it will look like a two-tone color, which is not desirable in terms of design. In this case, in order to make it difficult to see the insect screen when the fire sensor 1 is viewed from below, the top plate 9 is provided so as to protrude outward from the insect screen, and the projection length from the insect screen is L'. is set to be equal to or higher than the height H of the opening 11 .

In general, since the insect screen is provided inside the support 7, setting the overhang length based on the insect screen makes the diameter of the top plate 9 shorter than when the overhang length is set based on the support 7. Become. Therefore, when the overhang length is set based on the insect net, the struts 7 are not necessarily obscured, but it is possible to allow the struts 7 to be seen and at least make the insect net less visible. Therefore, in that case, the overhang length should be set based on the insect net.

The reason why the projection length L of the ceiling plate 9 from the column 7 is set to be equal to or greater than the height H of the opening 11 will be described with reference to FIG. .
The position of the line of sight and how it looks when looking up at the fire sensor 1 from below will be examined.
First, when looking up from directly below, that is, when the line of sight is on the center line of the fire sensor 1 shown in FIG. As the line of sight shifts from the center line and the angle α formed between the line of sight and the center line increases, the visible range of the portion hidden by the top plate 9 (overhang surface 22 of the main body 5) increases. Then, as shown in FIG. 4, when α is 45 degrees, the upper end of the post 7 or the insect screen is visible. In other words, if α is 45 degrees or less, when the fire sensor 1 is viewed from below, the strut 7 cannot be seen, and the top plate 9 and the projecting surface 22 of the main body 5 can be seen. When α is 45 degrees, the relationship between the overhang length L and the height H of the opening 11 is L=H.

When looking up at the fire sensor 1, it is assumed that α is normally 45 degrees or less. L should be set equal to or higher than the height H of the opening 11 .
A specific view of the fire sensor 1 from below will be described later.

Since the top plate 9 is provided so as to protrude outward, the top surface of the top plate 9 (the surface on the side of the opening 11 ) functions as a guide wall that guides the smoke to the opening 11 . Therefore, an uneven portion 23 may be provided on the upper surface of the overhanging portion of the top panel 9 in order to make the smoke flow more smoothly. Examples of the uneven portion 23 include a plurality of ribs 25 radially arranged in the circumferential direction at predetermined intervals as shown in FIG. Dimples 27 similar to the dimples described above may be provided at predetermined intervals in the circumferential direction.

The above example smoothes the inflow of smoke, but it is also possible to regulate the inflow of smoke, that is, to make it difficult for smoke to flow in, as necessary. That is, the uneven portion 23 has a function of adjusting the inflow of smoke.
Further, by providing the concave and convex portion 23, the surface area can be increased, and a function of trapping what is not desired to flow in, such as steam, can be provided.
Since the concave-convex portion 23 provided on the upper surface of the top plate 9 is not visible from the outside, the shape, arrangement, etc. can be determined from the functional aspect without worrying about the design.

<Air guide plate>
The air guide plate 13 is a doughnut-shaped plate attached to the main body 5 via a support portion 29 , and arranged to face the projecting surface of the top plate 9 . The air guide plate 13 is arranged to face the overhanging surface of the top panel 9 while floating in the air at approximately the middle position in the height direction of the opening 11 . It has the function of guiding smoke to
The air guide plate 13 is made of a transparent or translucent acrylic plate, and has a function as a confirmation light that introduces and guides the light from the LED 21 and lights up the peripheral end face. That is, the air guide plate 13 is a light guide, and the outer peripheral end face of the air guide plate 13 functions as a confirmation light. For this reason, the air guide plate 13 is provided with a light guide leg portion 31 for guiding the light of the LED 21 corresponding to the position where the LED 21 is provided.
If the air guide plate 13 does not function as a confirmation light, it need not be transparent or translucent. However, even if the air guide plate 13 is opaque, if the plate thickness of the air guide plate 13 is thin or if the light emission intensity is high, the air guide plate 13 can be removed by arranging the LED 21 behind the air guide plate 13. It is also possible to make it shine, and in this case it can also function as a confirmation light.
The confirmation light referred to here is one that lights up or flashes when the fire sensor 1 issues an alarm to visually notify the alarming fire sensor 1 .

The lower surface side of the air guide plate 13 is located inside the opening 11, and since the inside of the opening 11 is dimly lit between the top plate 9 and the main body 5, the air guide plate 13 functions as a confirmation light. By doing so, it becomes easier to check the light as the confirmation light without being disturbed by the outside light.
On the other hand, if the air guide plate 13 is made transparent, even if the shape is large, it will not be conspicuous, and the overall design composed of the main body portion 5 and the top plate 9 will not be hindered. Moreover, if it is transparent, even if the colors of the main body part 5 and the top plate 9 are unified or patterns are applied, these are not visually obstructed, and the overall design is not hindered. .

Furthermore, the air guide plate 13 is formed to be thicker than the top plate 9 and has a predetermined rigidity. You may make it function as a stop member. (See Figures 8 and 9)

Main functions of the fire sensor 1 of the present embodiment configured as described above will be described separately for each of the top plate 9 and the air guide plate 13 .
<Action of the top plate>
FIG. 7 is a diagram for explaining the effect of the top plate 9 on the appearance, and in the diagram, three types of fire sensors are shown in different viewing directions. In the figure, the left side is the example of the invention, the center is the conventional example A, and the right side is the conventional example B.
In FIG. 7, the uppermost fire sensor is viewed from the side (α=90 degrees), and the lower the fire sensor, the more oblique the viewing angle is (α=60 degrees, α=45 degrees), and the lowest one shows the state viewed from directly below (α=0 degrees).

As shown in FIG. 7, in the example of the invention, the inside of the opening 11 is hidden by the overhanging portion of the top plate 9 and becomes invisible by slightly slanting from the horizontal state. Therefore, for example, if the main body 5 and the top plate 9 of the fire sensor 1 are white, the whole will be white when viewed from below, and for example, if the ceiling surface, which is the mounting surface, is white, it will not stand out.

Also, if the support is visible, it is necessary to consider the direction of the support when installing the fire sensor. However, since the support 7 is not visible in this embodiment, it can be installed without considering the direction of the support. Therefore, the fire sensor 1 is not required to be mounted accurately, and the mounting work can be facilitated.

On the other hand, in the fire sensor 51 of the conventional example A, the strut 53 protrudes outward from the top plate 55, and the strut 53 and the opening 57 are visible in any state. The inside of the opening 57 is shadowed and dark, and when the fire sensor 51 is viewed from below, the inside of the opening 57 is visible, which is undesirable from the design point of view.
Further, in the case of the fire sensor 61 of the conventional example B, since the support 63 is in an upright state, compared to the fire sensor 51 of the conventional example A, the support 63 is less visible. However, the pillar 63 and the inside of the opening 65 are completely invisible only when viewed from directly below. has challenges.

When an insect screen is provided, in order to prevent the insect screen from deforming due to contact with a finger or the like, a grid-like crosspiece or the like is sometimes provided on the front surface of the insect screen (conventional method shown in FIG. 7). (See example B). In this embodiment, since the top plate 9 is projected, it is not easily touched by a finger or the like from the outside, and crosspieces or the like are not required from the viewpoint of protecting the insect net.

<Action of air guide plate>
As shown in FIGS. 1 and 2, the air guide plate 13 is arranged to face the overhanging portion of the top plate 9, so that it cooperates with the top plate 9 to prevent smoke, hot air, etc. It has the function of guiding airflow. Therefore, the airflow can be smoothly introduced into the opening 11 as compared with the case where the air guide plate 13 is not provided.
Also, the function of the air guide plate 13 as a confirmation light and the effect of making it transparent are as described above.

By imparting rigidity to the air guide plate 13, as shown in FIGS. 8 and 9, the main body 5 may also function as a locking member when detaching the main body 5 from the base 3 by means of a detaching device. . As shown in FIG. 8, the attachment/detachment device 33 used in this embodiment may have an engaging portion 37 formed of an elastic member such as rubber at the tip of a rod 35 . The engaging portion 37 has a tubular shape with an open end, and is provided with slits 39 at predetermined intervals on the peripheral edge of the end portion so that it can bend inward and outward in the radial direction.

When removing the main body 5, the engaging portion 37 is brought close to the fire sensor 1 from directly below (see FIGS. 8(a) and 9(a)), and the inner peripheral surface of the engaging portion 37 is introduced with air. The engaging portion 37 is pushed upward along with the outer peripheral surface of the plate 13 . As a result, the distal end portion of the engaging portion 37 bends, and the air guide plate 13 is inserted into the attaching/detaching device 33 and held by the elasticity of the engaging portion 37 (FIGS. 8B and 9B). )reference). In this state, by rotating the engaging portion 37 in the removal direction, the body portion 5 is unlocked from the base 3 and can be removed (see FIG. 8(c)).

As described above, the main body 5 and the top plate 9 may be integrally molded, but by integrating them as separate parts at the time of assembly, printing with a UV printer, tampo printing, or transfer can be easily performed. You can also print the same pattern.
10 shows a state in which the printer 41 is printing on the main body 5, and FIG. 11 shows a state in which the printer 41 is printing on the top panel 9. FIG. As a condition for such printing, the difference in level is within 10 mm.
On the other hand, in the case of the conventional fire sensor 71, as shown in FIG. 12, the main body and the top plate are integrally formed, and printing cannot be performed due to these irregularities. In such a conventional example, the outer surface of the fire sensor 71 is spray-coated, and the flexibility of appearance is low.

FIG. 13 shows that the air guide plate 13 is made opaque, and the top plate 9 and the main body portion 5 are printed with a checkered pattern. FIG. 14 shows a case in which the air guide plate 13 is transparent, and the checkered pattern of the main body 5 can be seen through the air guide plate 13 . By making the air guide plate 13 transparent in this way, even when the same pattern is formed on the main body 5 and the top plate 9, the air guide plate 13 does not interfere with the pattern.
By printing the same pattern as the pattern of the ceiling, the fire sensor 1 can be assimilated with the ceiling and made inconspicuous.

Although the above embodiment has been described by taking the smoke sensor as an example, the fire sensor 1 of the present invention is not limited to the smoke sensor, and includes a heat sensor that detects a hot airflow to detect a fire.
In the case of a heat sensor, since no insect screen is provided, the overhang length of the top plate 9 can be determined based on the support column 7 .

REFERENCE SIGNS LIST 1 fire sensor 3 base 5 main body 7 strut 9 top plate 11 opening 13 air guide plate 15 opening 17 smoke detector 19 substrate 21 LED
22 overhang surface 23 concavo-convex portion 25 rib 27 dimple 29 support portion 31 light guide leg portion 33 attachment/detachment device 35 rod 37 engaging portion 39 slit 41 printer 51 fire detector (conventional example A)
53 Support 55 Top plate 57 Opening 61 Fire sensor (conventional example B)
63 Support 65 Opening 71 Fire detector (conventional example)

Claims (4)

A smoke sensor that is attached to a mounting surface such as a ceiling surface and detects fire by smoke ,
a main body detachably attached to a base fixed to the attachment surface;
A smoke detection unit configured by a labyrinth or the like is provided in the main body,
A flat top plate is provided below the main body via a support, and an opening for introducing smoke into the main body is formed between the top plate and the main body,
An air guide plate is provided above the top plate so as to face the projecting surface of the top plate,
The top plate is provided so as to protrude outward from the support, the length of protrusion from the support is set to be equal to or greater than the height of the opening , and the upper surface of the top plate guides smoke to the opening. A smoke sensor as claimed in claim 1, wherein said air guide plate functions as a wall and guides smoke to said opening in cooperation with said top plate . The air guide plate is a doughnut-shaped plate attached to the main body via a support portion, and is arranged in a state of being suspended in the air at a substantially intermediate position in the height direction of the opening. The smoke sensor according to claim 1, characterized in that The main body portion has an overhanging surface that projects outward from the post, and the surface of the main body portion including the overhanging surface and the surface of the top plate are printed or transferred with the same pattern as that of the ceiling . The smoke detector of claim 1, characterized by: 2. The smoke detector according to claim 1, wherein said air guide plate is a light guide functioning as a confirmation light.

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