JP2005011136A - Fire sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation of an insect net to a black box, and to easily automate installation work in a production process. <P>SOLUTION: In this fire sensor, by rotating the black box 10 by 360 degrees with insertion holes 22a bored in one end of the insect net 20 fitted on protrusion parts 13 formed in the dark box 10 to wind the insect net 20 around the black box 10, and installing insertion holes 22b bored in the other end of the insect net 20 to the protrusion parts 13, the insect net 20 is installed to the black box 10. By thermally caulking the protrusion parts 13 or applying ultrasonic welding, the insect net 20 is certainly fixed to the black box 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fire detector having an insect screen.
[0002]
[Prior art]
In a smoke detector, which is one of the fire detectors, in order to prevent insects and dust from entering the detection part, a very fine metal net (insect net) is made into a cylindrical shape and made of resin. Fire detectors are known that are attached to a smoke inlet (dark box) of a shape.
(For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-203571 (page 3, FIG. 3)
[0004]
[Problems to be solved by the invention]
The above smoke detector is very popular in that it prevents mistakes that put the insect screen in the opposite direction, but the work of attaching the insect screen to the dark box was done manually, so the work efficiency was not so good. It was. In addition, the upper and lower ends of the insect screen hit the dark box resin at the time of installation, and it was difficult to install or the insect screen could be deformed in the worst case.
[0005]
It is an object of the present invention to simplify the installation of an insect screen to a dark box and to easily automate the installation work in the manufacturing process.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, a fire detector according to claim 1 of the present invention includes an inlet into which smoke flows, a dark box having a locking portion provided at a position other than the inlet, And an insect net provided with a lock receiving portion for locking to the lock portion.
[0007]
According to the first aspect of the present invention, since the insect screen is directly attached to the dark box, the assembly becomes easy, and it is easy to automate in the manufacturing process, and the manufacturing cost can be reduced.
[0008]
The invention according to claim 2 is the fire detector according to claim 1, wherein the locking portion is a projection and the locking receiving portion is an insertion hole drilled in an insect net. .
[0009]
According to invention of Claim 2, it can latch reliably by inserting the insertion hole drilled in the insect net to a projection part.
[0010]
According to a third aspect of the present invention, in the fire sensor according to the second aspect, after the insect net is locked, the insect net is fixed by caulking the projections with heat or ultrasonically welding. did.
[0011]
According to the third aspect of the present invention, since the insect screen is fixed to the dark box, the assembly is further facilitated, and there is no possibility that the insect screen is deformed.
[0012]
According to a fourth aspect of the present invention, in the fire detector according to the second or third aspect, the insertion holes are formed at predetermined positions on both ends of the insect screen.
[0013]
According to the invention described in claim 4, since the insertion hole is formed at a predetermined position, the positioning when the insect screen is attached is easy.
[0014]
According to a fifth aspect of the present invention, in the fire detector according to the first to fourth aspects, the insect net is wound around the dark box.
[0015]
According to the fifth aspect of the present invention, since the installation of the insect screen is a simple winding operation, the manufacturing process can be automated easily.
[0016]
According to a sixth aspect of the present invention, in the fire sensor according to the first to fifth aspects, the latch receiving portions at both ends of the insect screen are overlapped and locked by the locking portions.
[0017]
According to invention of Claim 6, when attaching an insect screen to a dark box, it can attach reliably, without producing a shift | offset | difference.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of the fire detector 1.
The fire detector 1 includes a dark box 10, an insect screen 20, a circuit board 30 that performs fire detection and signal processing, a main body 40, and a cover 50. The description of the circuit board 30, the body 40, and the cover 50 that are not the gist of the present invention will be omitted.
[0019]
FIG. 2 shows a dark box.
The dark box 10 is composed of an inflow port 11 through which smoke generated during a fire flows, a side wall 12, and a projection 13 that is integrally formed with the side wall 12 and protrudes to the outside.
The inside (not shown) has a labyrinth structure so that light does not enter the inside from the inflow port.
[0020]
In this embodiment, the protruding portion 13 is used as an example of the locking portion. However, the shape of the locking portion is not necessarily limited to the protruding shape, and any shape that can achieve the locking function may be used. Further, although two protrusions 13 are formed, one or a plurality of protrusions 13 may be provided.
[0021]
FIG. 3 shows the insect net 20.
The insect screen 20 is formed of a very thin metal plate and has a large number of openings 21. The opening 21 is formed in a size that allows smoke particles to pass through but does not allow insects or dust to pass through. Note that the height of the insect screen 20 is substantially the same as the height of the dark box 10.
[0022]
Furthermore, insertion holes 22 a and 22 b drilled to have a size slightly larger than the diameter of the projection 13 are provided at both ends of the insect screen 20.
In the present embodiment, the insertion holes 22a and 22b are given as an example of the latch receiving portion.
[0023]
FIG. 4 is a view showing attachment of the insect screen 20 to the dark box 10.
First, as shown in FIG. 4A, the insertion hole 22a drilled at one end of the insect screen 20 is inserted into the protrusion 13 formed in the dark box 10. In this state, the dark box 10 is rotated once to wind the insect screen 20 around the dark box 10.
[0024]
When the insect screen 20 is wound around the dark box 10, the insertion port 22 b drilled at the other end of the insect screen 20 is attached to the protrusion 13, thereby completing the installation of the insect screen 20 as shown in FIG. To do. Since this attachment is a relatively simple operation of rotating the dark box 10 once with one end of the insect screen 20 attached, it can be easily automated in the manufacturing process.
[0025]
The insect net 20 can be attached simply by locking here, but the insect net 20 can be securely fixed to the dark box 10 by further caulking the projection 13 with heat, ultrasonic welding, or press fitting. can do.
[0026]
By fixing the insect screen 20 to the dark box 10 in this way, the insect screen 20 will not be displaced when the fire detector 1 is assembled, so that the assembly is easy and further the deformation of the insect screen 20 can be prevented. it can.
[0027]
Furthermore, when attaching the insect screen 20 to the dark box 10, the insertion holes 22 a and 22 b are polymerized by the projections 13, so that the gap 10 and the gap are not generated between the dark box 10 and the insect screen 20. Can do.
[0028]
【The invention's effect】
According to the first aspect of the present invention, since the insect screen is directly attached to the dark box, the assembly becomes easy, and it is possible to automate the manufacturing process, thereby reducing the manufacturing cost.
[0029]
According to invention of Claim 2, it can latch reliably by inserting the insertion hole drilled in the insect net to a projection part.
[0030]
According to the third aspect of the present invention, since the insect screen is fixed to the dark box, the assembly is further facilitated, and there is no possibility that the insect screen is deformed.
[0031]
According to the invention described in claim 4, since the insertion hole is formed at a predetermined position, the positioning when the insect screen is attached is easy.
[0032]
According to the fifth aspect of the present invention, since the installation of the insect screen is a simple winding operation, the manufacturing process can be automated easily.
[0033]
According to invention of Claim 6, when attaching an insect screen to a dark box, it can attach reliably, without producing a shift | offset | difference.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fire detector according to the present invention.
FIG. 2 is a diagram showing a dark box according to the present invention.
FIG. 3 is a view showing an insect net of the present invention.
FIG. 4 is a view showing a state in which an insect screen is attached to a dark box.
[Explanation of symbols]
1 Fire detector 10 Dark box 13 Projection (locking part)
20 Insect net 22a, 22b Insertion hole (locking receiving part)

Claims (6)

It has an inflow port into which smoke flows, a dark box having a locking portion provided at a position other than the inflow port, and an insect net provided with a locking receiving portion for locking to the locking portion. Fire detector characterized by. 2. The fire sensor according to claim 1, wherein the locking portion is a protrusion, and the locking receiving portion is an insertion hole formed in an insect net. 3. The fire sensor according to claim 2, wherein after the insect screen is locked, the insect screen is fixed by caulking the projection with heat or by ultrasonic welding. The fire sensor according to claim 2 or 3, wherein the insertion hole is formed at a predetermined position on both ends of the insect screen. The fire detector according to claim 1, wherein the insect screen is wound around the dark box. 6. The fire sensor according to claim 1, wherein the latch receiving portions at both ends of the insect screen are overlapped by the latch portions and locked.

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