JPS588028B2 - Kodenshikikemurikanchiki - Google Patents

Description

Detailed Description of the Invention Generally, a photoelectric smoke detector has a light source and a light-receiving element facing each other, and a light shield is interposed between the two so that the light from the light source is not directly projected onto the light-receiving element. When there is no smoke, the light from the light source is reflected near the light source, the phosphor, and the light-receiving element and constantly enters the light-receiving element.In addition, the scattered light from smoke particles when smoke is present is added to the noise light that is constantly incident on the light-receiving element. This causes the light receiving element to respond.

By the way, if the relative positional relationship between the light source, the light receiving element, and the light body becomes out of order, or if dust or the like accumulates near them due to long-term use, the reflection of the light source changes, and the noise light There is also a risk that the sensor may malfunction due to fluctuations in scattered light.

Conventionally, in this type of photoelectric smoke detector, a light source, a light-receiving element, and a phosphor were each individually fixed to the sensor body.

Therefore, especially when the sensor body is made of synthetic resin, it is difficult to achieve dimensional accuracy of the molded product, and the light source, light receiving element,
When removing the light beams and the like for maintenance and inspection, the work is time-consuming since each item must be removed, and there is a risk that the characteristics may change due to the positional relationship between each item.

The present invention has been made in view of the above points, namely, a light source, a light receiving element, and a luminous body are mounted on a substrate that is better thermally and over time than a sensor body made of synthetic resin, The photoelectric smoke detector is characterized in that a substrate is removably attached to the sensor body, whereby the relative positional relationship of the light source, the light receiving element, and the light body can be set. It is designed so that the mutual positional relationship between them will not be disturbed, and it is possible to easily remove dust that has adhered to the lens over many years of use, or to easily replace the optical system part.

The present invention will be described below with reference to the drawings showing one embodiment of the invention. Reference numeral 1 denotes a circular sensor main body, which is composed of upper and lower lids X and Y formed in a circular shape from synthetic resin.

Therefore, the upper lid X is further attached to a base plate Xa that is attached to the ceiling surface H.
are separated.

Reference numeral 2 denotes a circular inner recess formed on the F side a of the base plate Xa, through which the base plate Xa has mounting holes 3, 3 for being attached to the ceiling surface H, and an electric wire lead-in port 4, respectively.

Reference numerals 5 and 5 denote two terminal boards installed in the inner recess 2, and the positional relationship with the mounting holes 3, 3 and the lead-in port 4 is such that the lead-in port 4 is in the center.
In addition, terminal plates 5, 5 are located parallel to both sides of this opening 4,
Moreover, the mounting holes 3, 3 are located on the outermost side.

6,. Reference numeral 56 denotes two wire tightening screws provided on each terminal board 5, 5, one each for inputting and the other for feeding.

Reference numerals 7, 7 indicate insertion blades formed diagonally at one end of each terminal plate 5, 5, which can be inserted into and removed from receiving blades 8, 8 provided on the upper surface b of the upper lid X by rotating the upper lid X. Can be freely joined and hooked.

In addition, the receiving blades 8, 8 are formed into a circular arc shape as they rotate, and become two blades 8a, 8b so as to sandwich the insertion blades 7, 7.
The upper blade 8a that receives the load is made of a thick plate, and the lower blade 8b is made of a thin spring plate that applies contact pressure, and is fixed to the protruding flesh part 9 so as to rise above the upper surface b of the upper lid X1.

Reference numeral 10.10 denotes a fixing screw thereof, which penetrates from the lower surface c of the upper lid X and is screwed into the receiving blades 8, 8.

Further, a circular receiving stage 11 is formed on the upper surface b of the upper lid X to position the base plate Xa for rotation.

Furthermore, this receiving stage 11 is provided with appropriate drainage notches 12, 12, and therefore, water droplets accumulated on the upper surface b of the upper lid X flow out from these notches 12, 12, and the receiving blades 8, 8 are Insulation failure due to water at the protruding flesh portion 9 is taken into consideration.

13.13 are the left and right chambers of a four-sided enclosing wall 13a that is formed integrally and protrudingly on the surface c of the upper lid
b.

The left and right chambers 13, 13 have a space 14 in the center,
In addition, the left and right chambers 13.13 are connected to the outer peripheral wall 15 of the upper lid X by hanging peripheral walls 17, 17 forming a parallel interval 16.

Then, a component 18 constituting a power supply section is housed in one chamber 13 of the left and right chambers 13.13, and a component 19 constituting a widening section and a switch section is housed in the other chamber 13, and silicone rubber 20 is poured in and sealed. ing.

In addition, each part 18 and 19 of the left and right chambers 13 and 13 is connected to the lead wire 2.
1, and are in contact with the ceiling C along the vertical walls 17, 17.

Incidentally, two wires of the lead wire 21 pass through the upper lid X and are connected to the receiving blades 8, 8 on the upper surface b.

Furthermore, a return wire 21a, which can also be referred to as a ground wire 41 for preventing electrical noise from the lead wire 21, has a relay contact 22 interposed therebetween.

This contactor 22 is connected to the space 1 of the left and right chambers 13, 13.
It is received by a small protruding pillar 23 located at 4.

The small protrusions 23 are protruded at four intervals of the space 14, and the small protrusions 23 and 23 on another diagonal line intersect with this relay contact 22 and other small protrusions 23 on the diagonal line. Ukeblade 8,
The fixing screws 10, 10 of No. 8 are inserted and positioned.

That is, the heads of Fuji 10, 10 are hidden.

Reference numeral 24 denotes a light source connected to the one chamber 13, which is a power supply section, through a lead wire 21, and uses a light emitting diode, for example.

Reference numeral 25 denotes a light receiving element connected to the other chamber 13, which is the amplifying part and the switch part, by a lead wire l1. The output of 25 is transmitted to a receiver (not shown) by the amplification section and switch in the other chamber 13, and determines the operation of the smoke detector.

The light source 24 and the light receiving element 25 are arranged opposite to the substrate 26.

Although this substrate 26 is made of a material that is more thermally and aged-resistant than the synthetic resin container body 1, metal is used as the material in the drawings of the embodiment. However, of course, a thermosetting synthetic resin may also be used.

27 and 28 are light shielding bodies located between the light source 24 and the light receiving element 25 to prevent light from being directly projected onto the light receiving element 25.

Therefore, the relationship between them is as follows.

That is, the light source 24 is formed into a cylindrical shape, is press-fitted into a split round hole 29b of a vertical piece 29a of an inverted L-shaped support frame 29 made of synthetic resin, and is held by the repulsive force of the widening of the split groove 29c.

Further, the small protrusions 24a of the light source 24 fit into the grooves 29c to determine the position.

29d is a horizontal piece of the inverted L-shaped support frame 29.

The light receiving element 25 is similarly formed in an inverted L shape, with a vertical piece 25a facing the light source 24.

25b is a horizontal piece of the element 25.

Further, one of the light bodies 27 located on the light source 24 side is formed of metal in an inverted L shape, and light sources 2 are further disposed on both sides of the vertical piece 27a.
Both sides 27b, 27b bent in the direction of 4 are provided,
It almost seems to surround the light source 24.

Further, the vertical piece 27a is provided with a hole 27c so that light is projected only in the necessary direction.

27d is a horizontal piece. The other light shielding body 2 on the light receiving element 25 side
8 is formed of synthetic resin into an inverted L shape, and the lowermost end of the vertical piece 28a is divided into two pieces 28b and 28C, with the taller piece 28
b to the source 24 side, and the lower one 28c to the light receiving element 2
It is placed at the 5th point, making it look like an edge that cuts out the light.

28d is a horizontal piece.

In addition, the support frame 29 of the light source 24, the light receiving element 25, and one of the light bodies 28 are attached to the substrate 26 on each horizontal piece 29d, 25b, 28d.
The vertical pieces 29a, 25a, 28a are inserted so that they are located on the upper surface, and are secured with screws 30.

Similarly, the other light shielding member 27 is fixed with its horizontal piece 27d against the lower surface of the substrate 26 with rivets 31 and 31.

32 is an insertion hole for each of the vertical pieces 29a, 25a, and 28a; 33 is a through hole provided in the center of the substrate 26 through the horizontal piece 27d of the shimmering light body 27; It rests on the children 23, 23, 23.23, and the screws 34, 34.
includes the relay contact 22 and diagonally positioned small protrusions 23.
It is screwed into 23.

Therefore, some of the lead wires 2 are connected to the relay contactor 22 and the board 26.
1 prevents sagging.

Note that one end 26a of the board 26 presses the lead wire 21 a lot, so it is bent downward.

Furthermore, if the light source 24 is removed from the support 29, the substrate 26 can be pulled out.

(Of course, the light receiving element 25 and its lead wire 21 remain connected) Also, as shown in the irradiation range of FIG.
The light is not directly projected onto the light receiving element 25, and these three members 24, 25, 27, and 28 constitute an optical system section Z.

Note that the substrate 26 is also considered to be a part of the optical system section Z.

Next, the lower lid Y will be explained.

35 is an outer circumferential wall of the lower lid Y, and an upward circumferential wall 37 forming a parallel interval 36 is formed.

38 are notches provided at four locations at the upper end of the upward peripheral wall 37;
Reference numeral 39 denotes a partition column that partitions the parallel interval 36 so as to be located at the same position as the four notches 38, and its upper end is substantially flush with the upper end of the upward peripheral wall 37.

Thus, this upward peripheral wall 37 is fitted so as to be interposed between the parallel interval 16 between the outer peripheral wall 15 of the upper lid X and the hanging peripheral walls 17, 17, and the lower lid is disposed in the parallel interval 16 of the upper lid Four receiving posts 40 are formed that match the Y notches 38.

Therefore, the upper end of the upward circumferential wall 37 of the lower lid Y does not fully contact the lower surface C of the upper lid Xo, and the gap 41 is maintained, allowing smoke from the outside to enter the interior through this gap 41.

Further, the partition column 39 prevents smoke from passing along the outer periphery of the upward peripheral wall 37 and allows it to enter the gap 41.

Reference numeral 42 denotes a circular window hole provided at the center of the lower lid Y, and the lower surface d of the lower lid Y is an inclined surface that becomes higher toward the outer periphery from the central circular window hole 42.

43 is a metal window cover placed on the upper surface of the lower cover Y, and the circular window hole 4
A circular recess 44 that fits into the recess 2 is formed, and the recess 44 has a large number of small holes 45 equally spaced from its outer periphery.

Similarly, this recessed portion 44 is located above the hole edge 42a of the circular window hole 42 with an interval 46 therebetween.

Therefore, smoke rising from the lower surface accumulates in this gap 46 and inevitably enters through the small hole 45.

Reference numeral 47 denotes an elastic sheet placed on the window cover 43, which is made of transparent nylon and has a large hole 48 bored therein.

49 is a metal circular press plate that rests on the elastic sheet 47;
Also, hold down the window cover 43 together with the seat 47 using the screws 50, 5.
Fixed by 0.50.

51, 51.51 is a screw 5 provided on the upper surface e of the lower lid Y
0.0, 50.50 are screwed into small protrusions, 52 is another small protrusion protruding from the upper surface, and serves to position the window cover 43, seat 47, and presser plate 49.

53 is a hole provided in the three parts 43, 47, and 49 with the small protrusion 52, and 54 is a hole provided in the center of the holding plate 49. The large hole 48 passes through the hole 54 and reaches the optical system section Z of the upper lid X.

Reference numeral 55 denotes a U-shaped metal fitting with a bottom opening, and both side pieces 55a, 55a are fixed to the holding plate 49 across the hole 54.

In addition, outward facing pieces 55b, 55b are provided on both side pieces 55a, 55a to improve the sitting comfort.

55c is a lower piece that connects both side pieces 55a, 55a, and 56 is an elastic mat attached to a presser plate 49, which pushes up the light body 27 on one side of the upper cover X when the upper and lower covers X and Y are combined.

Note that this mat 56 is made of sponge, rubber, or the like.

Numeral 57 is a tightening screw for assembling the upper and lower lids X and Y. It is inserted into the center of the upper lid match.

The head of this screw 57 matches the lead-in port 4 of the base plate Xa, and the screw 57 can be operated from the lead-in port 4 with a screwdriver.

58 is a retaining ring for the screw 57, which is C-shaped and is attached to the top cover X.
It is press-fitted into the hole 59 from the lower surface C of the holder, and is locked in the hole 59 by the repulsive force of the pressing force.

Further, by tightening this screw 57, the U-shaped metal fitting 55 and the stud 3L31 of the board 26 are directly connected.

Incidentally, in FIGS. 7 and 8 of the drawings of the embodiment, the small speckled portions are all colored black so as to absorb the light from the light source 24.

Further, to explain the operation of the photoelectric smoke detector of the present invention, the light source 24 emits light using power from the one chamber 13, which is the power supply section.

This light is prevented from being irradiated onto the light-receiving element 25 by the light beams 27 and 28, and the light-receiving element 25 is not yet in operation.

At this time, the light from the light source 24 is thought to be slightly diffusely reflected (noise light) within the upper and lower lids X and Y, but even with this, the element 25 is still not operating.

Next, when smoke occurs due to a fire, etc., the smoke enters through the small hole 45 of the window cover 43 of the lower cover Y, and enters the upper and lower cover X through the hole 54 of the holding plate 49.
, flows into Y.

When this smoke flows in, the light becomes scattered light due to the smoke particles, and is irradiated onto the light receiving element 25.

Therefore, the light receiving element 25 is activated, and the light is transmitted to the other chamber 13, which is the amplifying part and the switch part, and to a receiver (not shown) through the terminal plates 5, 5 of the base plate Xa.

As described above, the present invention mounts the light source 24, the light-receiving element 25, and the light bodies 27 and 28 on the substrate 26, which is superior in terms of heat and aging than the sensor body 1, and also allows the substrate 26 to be removed from the body 1. Since it was installed so that the light source 24, light receiving element 25,
The positional relationship of the light bodies 27 and 28 can be set relatively, so that the positional relationship of the three members 24, 25, 27, and 28 does not go out of order, and if necessary during regular checks, only the optical system part Z can be set. This has the effect of making it easy to replace.

[Brief explanation of drawings]

The drawings show one embodiment of the photoelectric smoke detector of the present invention, and Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is a sectional view taken along line A-A in Fig. 1, and Fig. 4 is a cross-sectional view taken along line B-B. 5 is a front view of the upper cover, Figure 6 is a front view of the lower cover, Figure 7 is an exploded perspective view of the upper cover, and Figure 8 is a cross-sectional view of the upper cover.
The figure is an exploded slope view of the lower cover, Figure 9 is a slope view of the base plate, and Figure 10 is a slope view of the base plate.
The figure is a front view of the optical system section, and FIG. 11 is a sectional view. 1...Sensor body, X...Top lid, Y...Bottom lid, X
a... Base plate, 2... Inner recess, 3... Mounting hole, 4...
...Inlet port, 5...Terminal board, 6...Tightening screw, 7.
・・Insert blade, 8・Receive blade, 9・Protruding meat part, 10・
・Fixing screw, 11 ・Rest, 12 ・Notch, 14
...Space, 15...Outer peripheral wall, 16...Parallel interval,
DESCRIPTION OF SYMBOLS 17... Drooping peripheral wall, 18... Parts, 19... Parts, 20... Silicone rubber, 21... Riet wire, 22
... Relay contact, 23... Small protrusion, 24... Light source, 25... Light receiving element, 26... Substrate, 27... Shiny light body, 28... Shiny light Body, 29... Support frame, 30.
...Screw, 31...Tack, 32...Insertion hole, 33...
・Through hole, 34... Screw, 35... Outer peripheral wall, 36.
... Parallel spacing, 31... Upward peripheral wall, 38... Notch, 39... Partition column, 40... Receiving column, 41... Spacing, 42... Circular window hole, 43 ... Window cover, 44 ... Hole, 45 ... Small hole, 46 ... Interval, 47 ... Elastic sheet, 48 ... Dog hole, 49 ... Holding plate, 50 ...
・Screw, 51... Small protrusion, 52... Small protrusion, 53.
... Hole, 54... Hole, 55... U-shaped fitting, 56.
...Elastic mat, 57...Tightening screw, 58...Keeping ring, 59...Hole.

Claims (1)

[Claims] 1. An optical system section is composed of a light source, a light receiving element, and a light shielding body that prevents the light from the light source from being directly projected onto the light receiving element, and when there is no smoke, the light from the light source is transmitted to the optical system section. Noise light that is reflected nearby and constantly enters the photodetector,
Furthermore, in a photoelectric smoke detector in which the light receiving element responds by adding the scattered light of smoke particles when smoke is present, the light source, the light receiving element, and the light body are made of synthetic resin. A photoelectric smoke detector characterized in that the photoelectric smoke detector is mounted on a board that is superior in terms of heat and aging than the main body of the sensor, and the board is removably attached to the main body of the sensor.