JP2004326261A - Water-proof plate for fire alarm - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent erroneous operation and a failure of a fire alarm due to the water by dew condensation, leakage of rainwater, melted snow from a roof, and the like, and to eliminate the failure of the fire alarm due to water. <P>SOLUTION: In a fire alarm water-proof plate 1 used for installation of the fire alarm 3 and attached to the lower face of a ceiling 2, a shallow recess part 8 recessed upward for mounting the fire alarm 3 is arranged, a groove 13 surrounding the fire alarm 3 installed to the shallow recess 8 is arranged, a water-proof wall 14 is protruded downward on the outside of the groove 13, and a hole 15 for installation to the ceiling is arranged on the outside of the water-proof wall 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fire detector flood prevention plate for mounting a spot type fire detector of a fire alarm on a ceiling or the like, and in particular, a malfunction of the fire alarm due to dew condensation on the attic, rain leakage, and water generated by melting snow from the roof. The present invention relates to a fire detector flood prevention plate which can prevent a fire alarm from malfunctioning and eliminate the need for replacement thereof.
[0002]
[Prior art]
Conventionally, there are the following types of fire detectors, for example.
(1) Bimetal switch type This type uses a bimetal switch that closes when the temperature rises in a fire.
(2) Diaphragm switch type This type uses a diaphragm switch that closes when the temperature rises sharply in a fire.
[0003]
There are the following types of fire detectors using a bimetal switch.
(1) One with only bimetal switch.
(2) Equipped with bimetal switch and printed circuit board.
This printed circuit board has a control function of controlling the lighting of an indicator lamp such as an LED and transmitting an operation signal to a fire alarm control device when a bimetal switch is closed, for example. Usually used in sensors.
[0004]
By the way, conventionally, it has been known that a fire detector is mounted via a base at a position corresponding to an opening formed in a ceiling (see Patent Documents 1 and 2).
[0005]
[Patent Document 1]
JP-A-7-16290 [Patent Document 2]
JP 2001-216578 A
[Problems to be solved by the invention]
According to the configuration of the conventional fire detector, when water is generated on the attic due to condensation, rain leak, snow melting, etc., there is a problem that such water infiltrates inside the fire detector through the following route, for example. stay up.
(1) Flood through the power inlet of the fire detector through the power cord wired on the attic.
(2) Flooding through the ceiling opening where the fire detector is installed.
(3) Water is flooded from the base for attaching the fire detector to the ceiling and the screw to attach to the ceiling.
[0007]
When water is flooded inside the fire detector in this way, the following problem occurs.
{Circle around (1)} Shorts occur in components constituting the sensor, such as a sensing switch (bimetal switch, etc.), a connection terminal, and a printed circuit board of the fire sensor, and malfunctions such as false alarms are likely to occur.
{Circle over (2)} Even if a malfunction occurs due to water infiltration in a bimetal switch or the like, normal operation is possible if the substrate is dried afterwards, but the printed circuit board or the like will be damaged once the water is flooded, and it will be necessary to replace the fire detector. When a large number of fire detectors are used in an office or the like, replacement and replacement thereof require a great deal of cost and labor.
[0008]
SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to solve the above-mentioned problems of the conventional base for mounting a fire detector on a ceiling, and to provide a fire detector flooding for mounting a fire detector having a structure that is difficult to be flooded on the ceiling. It is to realize a prevention plate.
[0009]
In the snowfall area, for example, if the snow accumulated on the slate roof melts slowly, the water generated by the snowmelt enters the attic from the gap between the upper slate and the lower slate due to capillary action and the like, There are many cases where water drowns on the ceiling and infiltrates the inside of the fire detector along the above route, and an urgent solution to the above problem is required.
[0010]
By the way, as a fire detector flood prevention plate to be attached to the ceiling of a fire detector, the following problems must be further solved.
(1) If the fire detector flood prevention plate is mounted on the ceiling, the mounting position of the fire detector will be lowered by the thickness of this flood prevention plate, and the cleaning tool will touch the fire detector or impinge upon the ceiling cleaning work. Contact may cause a malfunction. On the other hand, if the thickness of the flood prevention plate is too large, the appearance becomes poor when the fire detector is attached.
(2) There are various sizes of fire detectors depending on the product, and bases of various sizes are required.
[0011]
Therefore, a second problem of the present invention is that the fire detector can be mounted at a position as high as possible with respect to the ceiling, and the size and the size of the fire detector of various sizes are simple and easy to manufacture. The present invention realizes a fire detector that can be provided and that is simple to manufacture.
[0012]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention provides a fire detector inundation prevention plate provided with a fire detector receiving portion into which a fire detector is inserted, mounted with the fire detector and attached to a lower surface of a ceiling. The fire detector receiver has an upwardly recessed recess, and a flood prevention wall projects downward so as to surround the recess of the fire detector receiver, and a ceiling is provided outside the flood prevention wall. Provided is a fire detector flood prevention plate, which is provided with a mounting hole.
[0013]
The recess is formed so as to be depressed upward by the thickness of the fire detector flood prevention plate, and the mounting position of the fire alarm is preferably higher than the lower surface of the fire detector flood prevention plate.
[0014]
In order to solve the above problems, the present invention has a convex wall protruding upward, a fire detector receiving part formed around a lower end of the convex wall, and a fire detector receiving part formed outside the fire detector receiving part. A fire detector inundation prevention plate which is integrally formed with the flange portion and is attached to the lower surface of the ceiling with the fire detector mounted thereon, wherein the fire detector receiving portion forms an upwardly concave recess. A flood prevention wall projecting downward so as to surround the fire detector mounted and mounted in the recess, and a ceiling mounting hole provided outside the flood prevention wall; A cylindrical portion having a hole for electric wire insertion is formed on the top wall of the fire detector, and a fire sensor inundation prevention plate characterized in that a step portion is formed on the inner surface of the hole for electric wire insertion. provide.
[0015]
The electric wire can be attached so as to be routed from the upper surface of the top wall along the outer surface of the cylindrical wall and then drawn into the convex wall from the hole for inserting the electric wire and connected to the fire detector. Is characterized.
[0016]
It is preferable to provide a groove inside the flood prevention wall so as to surround the fire detector.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a fire detector flood prevention plate according to the present invention will be described based on an example with reference to the drawings.
[0018]
FIG. 1 is a view for explaining the outline of the configuration of a fire detector flood prevention plate according to the present invention. FIG. 1 (a) shows the mounting arrangement of the fire detector flood prevention plate on the ceiling, and FIG. 1 (b). FIG. 4 is a view showing a state where a fire detector is attached to a fire detector flood prevention plate.
[0019]
The fire detector 3 is attached to the ceiling 2 via the fire detector flood prevention plate 1 according to the present invention. In order to mount the fire detector 3 in this manner, an opening 4 is formed in the ceiling (accurately, a ceiling board) 2.
[0020]
The fire detector 3 corresponds to the position of the opening 4 of the ceiling 2 and is mounted via the fire detector flood prevention plate 1. The fire detector flood prevention plate 1 is a generally dish-shaped plate as a whole. The fire detector has a convex wall portion 5 whose outer shape protrudes upward, and detects fire around the convex wall portion 5. It comprises a container receiving portion 24 and a flange portion 6 on the outside thereof. The protruding wall 5 has a deep recess 7 on the inside, which is recessed upward to form a space.
[0021]
The deep recess 7 forms a stepped recess 9 that is continuous with the shallow recess 8 of the fire detector receiving portion 24 that opens to the lower side of the flood prevention plate 1. A step surface 10 (corresponding to the top surface of the shallow recess 8) is formed on the inner surface of the coupling portion between the shallow recess 8 and the deep recess 7. The step surface 10 and the upper surface 11 of the flange portion 6 are at the same height.
[0022]
In short, in the fire detector flood prevention plate 1 according to the present invention, the shallow recess 8 is provided in the fire detector receiving portion 24, and the mounting position 12 of the upper end of the fire detector 3 on the fire detector flood prevention plate 1 is changed. By retreating upward by the thickness t of the flange portion 6 of the fire detector flood prevention plate 1, the fire detector 3 is mounted at a higher position so as not to protrude downward as much as possible.
[0023]
A groove 13 having a square planar shape is formed on the lower surface of the flange portion 6 so as to surround the shallow recess 8 of the fire detector receiving portion 24, and a flat surface is formed so as to surround the outside of the groove 13. A water intrusion prevention wall (flange for returning water) 14 having a square shape is vertically protruded downward.
[0024]
Further, a screw insertion hole 15 is formed outside the water intrusion prevention wall 14. On the top wall 16 of the protruding wall portion 5, a cylindrical portion 17 for drawing in a power supply or signal transmission wire (not shown) is integrally formed, and from the cylindrical portion 17, the top of the protruding wall portion 5 is formed. An electric wire insertion hole 18 is formed to penetrate the wall 16 and pass through the recess 7 to penetrate the electric wire.
[0025]
As will be described in detail in the embodiment, the hole 18 for inserting the electric wire of the cylindrical portion 17 is composed of a small diameter portion 19 and a large diameter portion 20, thereby forming a step portion 21. It is configured to be able to hold the material sufficiently.
[0026]
The upper part of the fire detector 3 is fitted into the shallow recess 8 of the fire detector flood prevention plate 1, and the screw or the like extending upward from the inside of the case of the fire detector 3 is attached to the fire detector flood prevention plate 1. It is configured to be fixed.
[0027]
The convex wall portion 5 of the fire detector flood prevention plate 1 is inserted upward through the opening 4 of the ceiling 2, and the upper surface 11 of the flange portion 6 is arranged so as to contact the lower surface 22 of the ceiling 2. Then, a screw (or another fixing tool) is inserted through the screw insertion hole 15 of the flange portion 6 and the screw insertion hole 23 of the ceiling 2, and the fire detector flood prevention plate 1 is fixed to the ceiling 2.
[0028]
(Action)
According to the structure in which the fire detector 3 is attached to the ceiling 2 by the fire detector flood prevention plate 1 having the above structure, the following operation occurs. When water generated in the attic due to condensation, rain leakage, or snow melting adheres to the fire detector flood prevention plate 1, the water flows as shown by a series of arrows in FIG. 1 (b).
[0029]
That is, water flows along the outer surface of the fire detector flood prevention plate 1 and passes through the screw insertion hole 15 (to be precise, the gap between the screw insertion hole 15 and the screw) from the gap between the ceiling 2 and the flange portion 6. To the lower surface of. Then, the water flows down along the outer surface of the flood prevention wall 14 from the lower surface of the flange portion 6 and drops downward. Further, since the groove 13 is provided inside the flood prevention wall 14, it is difficult for water to flood the fire detector 3.
[0030]
Therefore, since water does not adhere to the fire detector 3 located inside the water intrusion prevention wall 14 and does not flow into the fire detector 3, water is flooded in the fire detector 3 and malfunction of the switch caused by electric leakage or the like occurs. Can be prevented, and damage to components such as a printed circuit board can be prevented.
[0031]
The fire detector flood prevention plate 1 has a step surface 10 (corresponding to the top surface of the shallow recess 8) and a flange of the shallow recess 8 of the fire detector receiving portion 24 into which the fire detector 3 is fitted. Since the height of the upper part 11 of the part 6 is the same as that of the upper part 11, a fire is detected on the lower surface of the flange part 6 by that much (the height of the concave part of the shallow recess 8 from the lower part of the flange part 6). The fire detector 3 can be mounted higher than in the case where the fire detector 3 is abutted, and there is no portion protruding downward in a room or a corridor. As a result, it is possible to prevent a malfunction from occurring by artificially touching or hitting the fire detector 3.
[0032]
(Example)
An embodiment of a fire detector flood prevention plate according to the present invention will be described with reference to FIGS. FIG. 2A is a plan view of the fire detector flood prevention plate, and FIG. 2B is a cross-sectional view taken along line AA of FIG. 2A. FIG. 3 is a bottom view. FIG. 4 is a diagram for explaining FIG. 2 in more detail, and particularly a diagram for explaining an electric wire mounting structure.
[0033]
The fire sensor flood prevention plate 31 of this embodiment is formed of a synthetic resin. As shown in FIGS. 2A and 3, the fire detector inundation prevention plate 31 is a dish-shaped plate having a square flat surface as a whole, and as shown in FIG. Are integrally formed from a convex wall portion 32 protruding upward, a fire detector receiving portion 33 connected to the outside of the lower end of the convex wall portion 32, and a flange portion 34 connected to the outside of the fire detector receiving portion 33. Is formed.
[0034]
The convex wall portion 32 has a square planar shape, and has a deep concave portion 35 which is recessed upward to form a space inside. As shown in FIGS. 2 and 4, a cylindrical portion 37 is provided so as to protrude from a substantially central portion of the top wall 36 of the convex wall portion 32. The cylindrical portion 37 has an electric wire insertion hole 39 through which an electric power supply or signal transmission electric wire 38 is inserted so as to penetrate the top wall 36 of the convex wall portion 32 and pass through the deep recess 35. ing.
[0035]
As shown in FIG. 4 (b), the electric wire insertion hole 39 of the cylindrical portion 37 is composed of a large diameter portion 40 and a small diameter portion 41 therebelow, thereby forming a step portion. The electric wire 38 is inserted through the electric wire insertion hole 39, and a sealing filler 43 is filled to seal (seal) a gap between the electric wire insertion hole 39 and the electric wire 38. With the configuration 42, the filler 43 is filled in the gap between the electric wire insertion hole 39 and the electric wire 38 so that it can be securely held.
[0036]
The convex wall portion 32 has a square planar shape, and has a deep concave portion 35 which is recessed upward to form a space inside. As shown in FIG. 3, the fire detector receiving portion 33 has a circular shallow recess 44 opening on the lower surface side of the fire sensor flood prevention plate 31. The shallow recess 44 and the deep recess above it are provided. 35 is a stepped recess 45 continuously. A step surface 46 is formed on the inner surface of the coupling portion between the shallow recess 44 and the deep recess 35.
[0037]
The step surface 46 (corresponding to the top surface of the shallow recess 44) and the upper surface 47 of the flange portion 34 are at the same height (in a flush relationship). In short, the mounting position of the fire detector 2 on the fire detector flood prevention plate 31 is retracted upward by the thickness t of the flange portion 34, so that the fire detector 2 can be mounted as high as possible. did.
[0038]
A bulge 49 is formed on the inner surface of the four side walls 48 of the convex wall 32, and a screw hole 50 is formed in the bulge 49 from below. A hole 51 is formed facing the screw hole 50 from above from the viewpoint of strength.
[0039]
As shown in FIG. 3, the flange portion 34 has a square planar shape on the lower surface of the flange portion 34 so as to surround the outside of the shallow recess 44 of the fire detector receiving portion 33. Is formed. Further, outside the groove 52, an inundation prevention wall 53 having a square planar shape protrudes vertically downward so as to surround the groove 52. Further, screw insertion holes 54 are formed on the four sides of the flange portion 34 outside the inundation prevention wall 53.
[0040]
The upper part of the fire detector 3 is fitted into the shallow recess 44 of the fire detector flood prevention plate 31, and the upper part of the fire detector 3 is in contact with the step surface 46. Then, the screw for mounting the fire detector 3 is engaged with the fire detector 3 and screwed upward into the screw hole 50 to fix the fire detector 3 to the fire detector flood prevention plate 31.
[0041]
The fire detector flood prevention plate 31 on which the fire detector 3 is mounted as described above can be inserted into the mounting opening 4 of the ceiling, and a screw can be inserted into the screw insertion hole 54 from below to be mounted on the ceiling 2.
[0042]
The electric wires 38 connected to the fire detector 2 are disposed along the outer surface of the cylindrical portion 37 from the upper surface of the top wall 36 of the convex wall portion 32, as shown in FIGS. Furthermore, it is inserted into the deep recess 35 through the electric wire insertion hole 39 of the cylindrical portion 37. The electric wires 38 arranged on the upper surface of the top wall 36 of the convex wall portion 32 are held by the holder 56 via the binding band 55.
[0043]
As shown in FIG. 4C, the holder 56 has an engaging portion 59 fixed to an upper surface of an adhesive tape 58 having an adhesive 57 applied to a lower surface. The holding member 56 is adhered to the upper surface of the top wall 36 of the convex wall portion 32 with an adhesive tape 58, and a binding band 55, which binds the electric wires 38, is inserted into the engaging portion 59 so that the electric wires 38 are connected to the convex wall portion. 32 is held in a lateral (horizontal) posture on the upper surface of the top wall 36.
[0044]
Further, a rubber cap 60 is attached from above to cover the cylindrical portion 37 together with the electric wire 38. With such a structure, the electric wire 38 can be attached to the upper surface of the top wall 36 of the convex wall portion 32, and the rubber cap 60 can be covered to prevent water from entering the cylindrical portion 37.
[0045]
(Action)
Since the fire detector inundation prevention plate 31 of this embodiment has the above-described configuration, water generated inside the ceiling due to dew condensation water, rain leak, and snow melting water is applied to the fire detector inundation prevention plate 31. Water flows along the outer surface and reaches the lower surface of the flange portion 34 through the screw hole 54. Further, the water flows down from the lower surface of the flange portion 34 along the outer surface of the inundation prevention wall 53 and drops downward. Further, since the groove 52 is provided inside the flood prevention wall 53, water does not flood the fire detector 2.
[0046]
In addition, as shown in FIGS. 4A and 4B, the water transmitted through the electric wire 38 is attached to the upper surface of the top wall 36 of the convex wall portion 32 in a horizontal (horizontal) posture. The upper portion is further wired upward along the outer surface of the cylindrical portion 37, covered with the cylindrical portion 37 by the rubber cap 60, and sealed inside the cylindrical portion 37 with the sealing filler 43. Water can be prevented from entering.
[0047]
Accordingly, since the fire detector 2 located inside the flood prevention wall 53 does not flood, there is no malfunction due to electric leakage due to water flooding in the fire detector 2 or a switch unit, a printed circuit board or the like. Parts can be prevented from being damaged.
[0048]
Further, in the fire detector flood prevention plate 31, a shallow recess 44 is formed in the fire detector receiving portion 33, whereby the mounting position of the fire detector 2 on the fire detector flood prevention plate 31 is determined by the thickness of the flange portion 34. By retreating upward by the (thickness of the flood prevention plate), the protruding portion of the fire detector downward is reduced. As a result, it is possible to prevent the fire detector from being touched or hit by a human being to cause a malfunction.
[0049]
As mentioned above, although the embodiment of the fire detector flood prevention plate according to the present invention has been described based on the examples, the present invention is not limited to such examples and is described in the claims. It goes without saying that there are various embodiments within the scope of technical matters.
[0050]
【The invention's effect】
According to the fire detector flood prevention plate of the present invention having the above configuration, the following effects are obtained.
(1) The fire detector is provided with a flood prevention wall protruding downward through a groove around the fire detector of the flood detector plate, so that water transmitted from the attic caused by condensation, rain leakage, snow melting, etc. causes fire. Since it is possible to prevent the detector from being flooded, malfunction of the fire detector can be prevented, and work such as replacement due to damage becomes unnecessary.
[0051]
(2) A shallow recess that is recessed upward by the thickness of the fire detector flood prevention plate is provided, and the fire detector is inserted and mounted in this recess. Since the position is on the lower surface of the ceiling, there is no influence that the mounting position is lowered due to the thickness of the flood prevention plate. Therefore, it is possible to reduce artificial malfunctions caused by a person accidentally touching or touching the fire detector, and it is possible to prevent the appearance of the fire detector from being deteriorated.
[0052]
(3) Since the fire detector flood prevention plate has a simple structure, its manufacture is relatively easy, and various types of fire detectors having various dimensions can be provided.
[0053]
(4) A step portion is provided in the cylindrical portion for drawing in the electric wire so that the sealing filler can be sufficiently held and held. Further, if the electric wire and the cylindrical portion are covered with a rubber cap, water intrusion from the cylindrical portion can be prevented. Can be prevented. Further, since the electric wire is mounted on the top surface of the fire detector flood prevention plate with a holding device via a tying band, the electric wire is in a horizontal (horizontal) posture, and further upward along the outer surface of the cylindrical wall. After being extended and drawn into the cylindrical portion, intrusion of water transmitted through the electric wire from the cylindrical portion can be further prevented.
[Brief description of the drawings]
FIG. 1 is a view for explaining the outline of the configuration of a fire detector flood prevention plate according to the present invention, in which (a) shows a mounting arrangement of the fire detector flood prevention plate with respect to a ceiling, and (b) shows a fire detector. It is a figure which shows the state which attached the fire detector to the inundation prevention plate.
FIGS. 2A and 2B are diagrams illustrating an embodiment of a fire detector flood prevention plate according to the present invention, wherein FIG. 2A is a plan view, and FIG. 2B is a diagram illustrating a cross section taken along line AA of FIG.
FIG. 3 is a view showing a bottom surface of an embodiment of a fire detector flood prevention plate according to the present invention.
FIG. 4 is a view for explaining FIG. 2 in more detail, and particularly for explaining an electric wire mounting structure. FIG. 4 (a) shows the entire structure, and FIG. 4 (b) shows a sealing structure of a cylindrical portion. (C) is a diagram showing an electric wire mounting structure.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Fire detector flood prevention plate 2 Ceiling 3 Fire detector 4 Ceiling opening 5 Convex wall 6 Flange 7 Deep recess formed by convex wall 8 Shallow recess formed by fire detector receiver 9 steps -Shaped recess 10 Step surface 11 Upper surface of flange 12 Mounting position 13 at the upper end of fire detector Groove 14 Water infiltration prevention wall (flange for returning water)
15 Screw insertion hole 16 Convex wall top wall 17 Cylindrical part 18 Wire insertion hole 19 Small diameter part 20 Large diameter part 21 Step part 22 Ceiling lower surface 23 Ceiling screw insertion hole 24 Fire detector receiving part 31 Fire detection Water immersion prevention plate 32 Convex wall 33 Fire detector receiving part 34 Flange 35 Deep recess 36 Top wall 37 of convex wall Cylindrical part 38 Electric wire 39 Wire insertion hole 40 Large diameter of wire insertion hole Part 41 Small-diameter part of hole for electric wire insertion 42 Step part 43 of hole for electric wire insertion Sealing material 44 Shallow recess 45 Step-shaped recess 46 Step surface 47 Upper surface of flange part 48 Side wall of convex wall part 49 Swelling portion 50 on inner surface of side wall 50 Screw hole 51 Hole 52 Groove 53 Waterproof wall 54 Screw insertion hole 55 Bundling band 56 Holder 57 Adhesive 58 Adhesive tape 59 Engaging portion 60 on top of adhesive tape 60 Rubber cap

Claims (5)

A fire detector inundation prevention plate provided with a fire detector receiving portion into which a fire detector is inserted, the fire detector being mounted and attached to a lower surface of a ceiling,
The fire detector receiving part forms a recess that is depressed upward,
A flood prevention wall protrudes downward so as to surround the recess of the fire detector receiver,
A fire detector flood prevention plate, wherein a ceiling mounting hole is provided outside the flood prevention wall. The recess is formed so as to be depressed upward by the thickness of the fire detector flood prevention plate, and the mounting position of the fire alarm is higher than the lower surface of the fire detector flood prevention plate. Item 4. The fire detector flood prevention plate according to Item 1. A convex wall protruding upward, a fire detector receiver formed around the lower end of the convex wall, and a flange formed outside the fire detector receiver are integrally formed, A fire detector flood prevention plate attached to a fire detector and attached to the lower surface of the ceiling,
The fire detector receiving part forms a recess that is depressed upward,
A flood prevention wall is projected downward so as to surround the fire detector attached and mounted in the recess, and a ceiling mounting hole is provided outside the flood prevention wall,
A fire detector comprising: a cylindrical portion having a hole for inserting an electric wire formed on a top wall of the convex wall; and a step formed on an inner surface of the hole for inserting the electric wire. Water immersion prevention plate. The electric wire can be attached so as to be routed from the upper surface of the top wall along the outer surface of the cylindrical wall and then drawn into the convex wall from the hole for inserting the electric wire and connected to the fire detector. The fire detector flood prevention plate according to claim 3, wherein: The flood detector plate according to any one of claims 1 to 4, wherein a groove is provided inside the flood detector wall so as to surround the fire detector.

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