JP2581492Y2 - Photoelectric smoke detector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoelectric smoke detector.

[0002]

2. Description of the Related Art FIG. 5 is a front view of a photoelectric smoke detector, in which a cover block 2 is mounted at the center of a base 1. As shown in FIG. 6, a printed circuit board 4 on which an electronic component 3 constituting a signal processing circuit and the like is mounted on the bottom of the concave portion 1A at the center of the base 1 on which the cover block 2 is mounted while holding the packing 5 via the packing 5. And the printed circuit board 4 is pressed by two upper and lower holders 6 and 7 for holding the optical system components, and the holders 6 and 7 are further placed on the labyrinth 8 of the cover block 2.
It is held down by. Reference numeral 15 denotes a spacer.

[0003] The cover block 2 is composed of an insect repellent net 9 wound in a cylindrical shape, and a labyrinth 8 disposed inside the insect repellent net 9.
And a cap 10 fitted to one end opening side of the insect net 9;
A retaining claw 13 ′ formed at one end of the retaining ring 12 is engaged with an outer peripheral portion of the labyrinth 8, which is formed of a pressing ring 12, and protrudes outside the insect net 9.
Insertion hole 1 formed in base 1 around the opening of recess 1A
The labyrinth 8 is fixed to the base 1 by inserting it into the base 4 and engaging with the opening edge of the insertion hole 14 inside the base 1. And the printed circuit board 4 is hermetically sealed to protect the electronic components 3 arranged on the space side from corrosive gas of the outside air.

[0004]

However [devised SUMMARY], in the above prior art, the ring 12 pressing as shown in FIG. 6, since the labyrinth 8 are not fixed to each other, the elastic force is a printed circuit board 4 of the packing 5, the holder 6, 7, Labyrinth 8
To push up one end of the holding ring 12
The labyrinth 8 and the separate holding ring 12 have one end
Is bent in the direction of arrow B, and the locking claw 13
The insertion hole 14 is bent inward in the direction of the mark C, and is inserted into the base 1.
Like it has the locking margin of the opening edge and the locking claw 13 of less
State. Therefore, there is a problem that the cover block 2 comes off the base 1 due to a drop impact, vibration, or other impact. Further, if the cover block 2 is detached from the base 1, smoke detection becomes impossible, and there is a fear that it becomes a fatal problem as a smoke detector.

As shown in FIG. 8, the mounting direction of the labyrinth 8 needs to be positioned because the sensitivity shifts if the rotation direction is not constant with respect to the light emitting section 17 and the light receiving section 16 of the optical system. Therefore, it is necessary to position the locking claw 13 so as to be inserted into the insertion hole 14 of the base 1 and to be hooked on the locking margin of the opening edge of the insertion hole 14. In other words, in order to attach the cover block 2 to the base 1, a total of two times of positioning, the positioning of the labyrinth 8 and the positioning of the holding ring 12, are required. There were also problems.

[0006] The present invention has been made in view of the above-mentioned problems, and a purpose thereof is to provide a sufficient locking allowance between a base and a holding ring, and to provide a cover block even when impact or vibration is applied. Another object of the present invention is to provide a photoelectric smoke detector which does not fall off from the base and requires only one positioning at the time of assembling, and has improved assembling workability at the time of inspection and cleaning or at the time of product manufacturing.

According to the present invention, there is provided an insect repellent net formed in a cylindrical shape to achieve the above-mentioned object, a labyrinth disposed inside the insect repellent net, a cap fitted to one end opening side of the insect repellent net,
Labyrinth Nsu which extends to the outside from the other end opening side of the insect screen
The cover block is composed of a holding ring with one end integrally connected to the outer periphery of the end of the base, and printed via packing so that the mounting surface of the electronic component is on the bottom side of the bottom of the recess at the center of the base While arranging the board, the end of the labyrinth is fitted into the opening of the recess so as to press the printed board via the holder for holding the optical system component, and the locking claw provided at the other end of the pressing ring is engaged with the recess. The locking pawl is inserted into an insertion hole formed in the base around the opening, and the locking claw is locked to an opening edge of the insertion hole inside the base.

The labyrinth and the holding ring may be formed separately, and one end of the holding ring may be fixed to the outer periphery of the other end of the labyrinth to be integrated, or the labyrinth and the holding ring may be formed by two-color molding. It may be integrated, and the color of the holding ring may be the same as the color of the base, and the labyrinth and the holding ring may be integrally formed in the same color or black as the color of the base, and the color at the time of molding may be the same as the base. If so, the labyrinth surface may be painted black, and if the color at the time of molding is black, the pressing ring surface may be painted in the base color.

[0009]

According to the present invention, since the labyrinth and the holding ring are integrally connected, the holding ring is pushed up together with the labyrinth even if the labyrinth is pushed by the elastic force of the packing. Only one end of the press ring does not bend in the outer peripheral direction. As a result, the locking claw on the other end is unlikely to bend in the anti-locking direction, and as a result, the locking claw can sufficiently secure the locking margin with the opening edge of the hole of the base, and the cover can be protected even if impact or vibration is applied. Blocks are less likely to come off the base.

[0010] In addition, since it is not necessary to align the labyrinth and the holding ring at the time of assembly, the cover block can be incorporated into the base only by positioning the holding ring in the insertion hole. The workability of assembling during product manufacturing is improved. In addition, the labyrinth and the holding ring are formed separately, and one end of the holding ring is fixedly attached to the outer peripheral portion of the other end of the labyrinth, or the labyrinth and the holding ring are integrated by two-color molding and held together. Make the color of the ring the same as the color of the base, or integrally mold the labyrinth and the holding ring in the same color or black as the color of the base, and if the color at the time of molding is the same color as the base, make the labyrinth surface black. If the color at the time of molding is black, the surface of the holding ring is painted in the color of the base, so that the labyrinth that needs to be black and the holding ring that needs to be the same color as the base in appearance are integrally connected. It becomes possible.

[0011]

1 and 2 show a main part of an embodiment of the present invention. In this embodiment, a labyrinth 8 made of a black synthetic resin molded product which is unlikely to reflect light is used to detect smoke.
The upper end 8a and one end of a holding ring 12 formed of a synthetic resin molded product of the same color as the base 1 are integrally connected and fixed by ultrasonic welding. Of course, they may be integrally connected and fixed by an adhesive.

At the time of assembly, a locking claw 13 formed at the other end of the holding ring 12 is inserted into an insertion hole 14 formed in the base 1 as shown in FIG. When the labyrinth 8 is fixed in the same manner as in the conventional example by locking to the opening edge, the incorporation of the cover block 2 into the base 1 is completed. The members housed in the recess 1A are the same as those in the conventional example shown in FIG.

In FIG. 6, the resiliency of the packing 5 is determined by the pressure of the holding ring 12 via the printed circuit board 4, the holders 6 , 7 accommodated in the bottom of the recess 1A, and the labyrinth 8.
One end is to be pushed up in the same direction B as the direction A of the pushing force of the packing 5 shown in FIG. 1, but since the labyrinth 8 and one end of the holding ring 12 are integrated, the conventional holding as shown in FIG. There is no bending of the one end of the ring 12 in the outer peripheral direction, and the direction in which the resultant holding ring 8 is pushed up and the direction in which the locking claw abuts on the opening edge are substantially in the same direction. It becomes difficult to bend in the anti-locking direction C, and the locking between the locking claw 13 and the opening edge of the insertion hole 14 is stabilized with a sufficient locking margin.

In the above embodiment, the pressing ring 12 and the labyrinth 8 are formed separately and fixed by welding.
Although it was formed into a body, as shown in FIG. 4, the holding ring 12 and the labyrinth 8 may be formed in two colors to be integrally formed. In addition, a holding ring 12 and a labyrinth 8 of the same color
In the case of molding integrally with, for example, black, the surface of the holding ring 12 may be coated 18 with the same color as the color of the base 1. Of course, when the color at the time of molding is matched with the color of the base 1, the surface of the labyrinth 8 may be painted black.

[0015]

[Effect of the Invention] In the present invention, since the labyrinth and the holding ring are integrally connected, the labyrinth is printed on.
Even if a force that is pushed up by the elastic force of the packing works via the plate and holder , the holding ring is pushed up with the labyrinth, and the boundary with the labyrinth of the holding ring.
A is one end without being flexed toward the outer circumference part, thus Pas
Printed circuit board, holder, la
Direction of pushing up the holding ring through the violin
Perpendicular to the contact surface of the locking claw with the opening edge.
Since they are substantially in the same direction, the locking claw at the other end is unlikely to bend in the anti-locking direction. As a result, the locking claw can sufficiently take the locking margin with the opening edge of the hole of the base, and the impact and Even if vibration is applied, there is an effect that the cover block does not easily come off the base,
In addition, since there is no need to align the labyrinth with the retaining ring, the cover block can be incorporated into the base simply by positioning the retaining ring in the insertion hole. There is an effect that workability is improved.

Further, the labyrinth and the holding ring are formed separately, and one end of the holding ring is fixedly attached to the outer peripheral portion of the other end of the labyrinth, or the labyrinth and the holding ring are integrated by two-color molding. The color of the holding ring is the same as the color of the base, or the labyrinth and the holding ring are molded integrally with the color of the base or black, and if the color at the time of molding is the same color as the base, the labyrinth surface is If the color at the time of molding is black, paint the holding ring surface to the color of the base, so that the labyrinth that needs to be black and the holding ring that needs to be the same color as the base in appearance are integrated. It becomes possible to connect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of one embodiment of the present invention.

FIG. 3 is a sectional view of a main part of another embodiment of the present invention.

FIG. 4 is a sectional view of a main part of another embodiment of the present invention.

FIG. 5 is a front view of the photoelectric smoke detector.

FIG. 6 is a sectional view of a main part of a conventional example.

FIG. 7 is an explanatory diagram of a conventional example.

FIG. 8 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 base 1A recess 2 cover block 8 labyrinth 9 insect net 12 holding ring 13 locking claw 14 insertion hole

Claims (4)

(57) [Scope of request for utility model registration] An insect repellent net formed in a cylindrical shape, a labyrinth disposed inside the insect repellent net, a cap fitted to one end opening side of the insect repellent net, and extending outside from the other end opening side of the insect repellent net. and which constitutes the cover blocks in the retaining ring which is integrally connected at one end to the outer periphery of the end portion of the labyrinth Nsu packing as the mounting surface of the electronic part to the bottom of the recess of the base center is bottom side Place the printed circuit board through
The end of the labyrinth is fitted into the recess opening so as to press the printed circuit board via the holder for holding the optical system components, and the locking claw provided at the other end of the holding ring is fitted to the base around the opening of the recess. A photoelectric smoke detector, wherein said hook is inserted into an insertion hole formed in a base and said locking claw is locked to an opening edge of said insertion hole inside said base. 2. A labyrinth and a holding ring are formed separately, and one end of the holding ring is fixedly attached to the outer peripheral portion of the other end of the labyrinth, and the color of the holding ring is made the same as the color of the base. The photoelectric smoke detector according to claim 1, wherein: 3. The photoelectric smoke detector according to claim 1, wherein the labyrinth and the holding ring are integrated by two-color molding, and the color of the holding ring is the same as the color of the base. 4. The labyrinth and the holding ring are integrally molded in the same color or black as the base, and if the color at the time of molding is the same as that of the base, the labyrinth surface is black and the color at the time of molding is black. The photoelectric smoke detector according to claim 1, wherein the surface of the holding ring, if any, is painted in the color of the base.