JP3223361B2 - Waterproof fire 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 waterproof fire detector, and more particularly, to a waterproof fire detector in which a conductive portion comprising a printed circuit board, a lead wire, and the like housed in a main body has an improved waterproof function. It is about a vessel.

[0002]

2. Description of the Related Art Fire detectors are usually mounted on the ceiling of a building and monitor the occurrence of a fire in the room. If the room to be monitored is in an environment where water droplets are generated by water vapor, such as a kitchen, or in a place where there is a risk of rain leakage, the water droplets will enter the conductive parts of the fire detector and cause insulation failure. And dielectric breakdown may occur.

[0003] Therefore, in such places, a waterproof fire detector having a waterproof function is generally installed. FIG. 4 shows an example of such a waterproof fire detector. In the figure, 1 is a main body made of a synthetic resin, the upper part of which is reduced in diameter to form a cylindrical holding part 2 having a bottom plate 3, and below the holding part 2, as shown in FIGS. A substantially rectangular box-shaped printed circuit board accommodation section 5 having one end formed in an arc shape is formed. Reference numeral 6 denotes an element base housed in the holding unit 2,
Two electrodes 7a and 7b are provided, and these electrodes 7a and 7b are provided.
One end of “b” projects through the bottom plate 3 of the holding unit 2 and projects into the printed circuit board receiving unit 5, and the other end projects from the upper surface of the element base 6. long,
The other electrode 7b is shorter than this.

Reference numeral 8 denotes a contact spring having one end attached to the upper end of an electrode 7a having a long protrusion, and a contact 9 provided at the other end to face the electrode 7b having a short protrusion. Reference numeral 10 denotes a protrusion provided on the contact spring 8. 11 is convex part 1 in the center
2, a metal heat-receiving plate integrally connected to the upper part of the main body 1, and a heat-sensitive element 13 such as a bimetal as a fire detecting portion is attached inside the convex portion 12, and a constantly projecting element is provided. 10 is in contact.

[0005] Reference numeral 15 denotes a printed circuit board (a conductive pattern provided on the circuit board and electric components mounted thereon are omitted). As shown in FIG. Notches 16a and 16b are formed on both sides in the length direction.
Reference numerals 17a and 17b denote electrode holes into which the electrodes 7a and 7b are inserted and electrically connected, and reference numeral 18 denotes a confirmation lamp formed of an LED. Reference numerals 19a and 19b are connected to a pair of terminal portions 21a provided on the printed circuit board 15, and power and signal leads connected to a power source (not shown). Reference numerals 20a and 20b are also connected to a pair of terminal portions 21b. Power and signal leads, and these leads 19a, 19b, 20a, 20b
Is connected to a receiver (not shown) and other fire detectors.

The printed circuit board 15 includes lead wires 19a, 19b connected to the terminal portions 21a, 21b,
20a and 20b are respectively bent to form notch portions 16a and 1
6b, the electrodes 7a, 7b are inserted into the electrode holes 17a, 17b, and are housed in the printed circuit board housing 5. The confirmation light 18 is inserted into a cap 22 attached to a hole 14 provided at the bottom of the printed circuit board housing 5.

Next, as shown in FIG. 5, a filler 23 such as a liquid silicone rubber or an epoxy resin is filled in the printed board accommodating portion 5 with the upper part of the main body facing downward, and the filler 23 is printed. Notch 1 of substrate 15
The printed circuit board 15, the confirmation light 18, and the lead wires 19 a, 19 b, 20 a, 20 b, etc. are sealed in the print base accommodating section 5 through the insides 6 a, 16 b.

The above-described waterproof fire detector is mounted on a ceiling surface, and leads 19a and 19b are connected to a power supply, and leads 20a and 20b are connected to a receiver. When a fire occurs, the bimetal 1
3 is inverted, the contact spring 8 is pressed down, and the contact 9 becomes the electrode 7b.
And the power supply circuit is closed. As a result, a circuit of the lead wires 20a and 20b and the confirmation light 18 is formed, a fire signal is transmitted from the lead wires 19b and 20b to the receiver side, and the confirmation light 18 is turned on to notify the occurrence of a fire.

[0009]

As described above, the conventional waterproof fire detector has a printed circuit board 1 constituting a conductive portion.
5 is accommodated in the printed circuit board accommodating portion 5 and is filled with the filler 23 to perform waterproofing. However, when the filler 23 is filled, the lead wires 19a, 19b, 20a, and 20b are notched 16a. , 16b to move the printed circuit board housing 5
Lead wires 19a and 19a
b, 20a and 20b adhere to each other, and the filler 23 is solidified as it is.

When the fire detector is mounted on the ceiling, the work is often performed by pulling or bending the lead wires 19a, 19b, 20a, and 20b. Therefore, the lead wires 19a, 19b, 20a, and 20b are connected to the printed circuit board. There may be a gap between the wall of the housing 5 and the lead wire 19a.
19b and 20a and 20b may be separated from each other to form a gap. For this reason, water may enter the conductive portion from these gaps, deteriorating the function of the conductive portion.

Also, since the cap 22 of the confirmation light 18 is conventionally formed of a material having no adhesive force with the filler 23, the confirmation light 18 is fixed by the filler 23. Since the inner diameter of the cap 22 is substantially the same as the outer diameter of the confirmation light 18, the filler 23 does not spread to the tip of the cap 22, and water may enter from the mounting portion of the cap 22.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to obtain a waterproof fire detector in which water does not enter the conductive portion by changing the shape of a printed circuit board. It was done.

[0013]

SUMMARY OF THE INVENTION A waterproof fire detector according to the present invention includes a main body having a substantially box-shaped printed circuit board housing portion therein, a fire detection portion provided at an upper portion, and a fire detection portion. An electrode and a lead wire extended into the printed circuit board housing portion are connected and housed in the printed circuit board housing portion, and are composed of a printed circuit board sealed with a filler, and a lead wire is attached to at least one side edge of the printed circuit board. And a cut-out portion is provided on at least one edge portion orthogonal to the side edge on which the fitting groove is provided.

[0014] The waterproof fire detector according to the present invention comprises:
A main body having a substantially box-shaped printed circuit board accommodation section inside and a fire detection section provided at the top, and electrodes and lead wires extending from the fire detection section into the printed circuit board accommodation section are connected to each other to accommodate the printed circuit board. A printed circuit board housed in the portion and sealed with a filler, provided with a fitting groove for fitting a lead wire on at least one side edge of the printed circuit board, and one orthogonal to the side edge provided with the fitting groove. A confirmation light is provided in the vicinity of the edge of the confirmation light, and a cap of the confirmation light is provided on the printed circuit board receiving portion, and a filler is filled between the inside of the cap and the confirmation light. It is formed so that it can be obtained.

[0015]

[0016]

The lead wire connected to the printed circuit board is bent, fitted into the fitting groove, taken out on the opposite side, and the printed circuit board is inserted into the printed circuit board housing to connect the electrodes. Next, a filler is filled in the printed circuit board accommodating portion to seal these conductive portions in a watertight manner, and a cutout portion provided at an edge perpendicular to a side edge provided with a fitting groove of the printed circuit board to the inside of the printed board. Fill the filler.

Further, the lead wire connected to the Priton board is bent, fitted into the fitting groove, taken out on the opposite side, and the printed board is inserted into the printed board housing to connect the electrodes. Next, a filler is filled in the printed circuit board accommodating portion, and these conductive portions are hermetically sealed. Then, the gap provided between the confirmation light and the cap is filled with the filler, and the cap and the confirmation light are securely fixed at a predetermined position.

[0018]

【Example】

Embodiment 1 FIG. 1 is a perspective view of an embodiment of a printed circuit board constituting a conductive part of a waterproof fire detector according to the present invention. Note that portions other than the conductive portion are the same as those in the conventional example of FIG. 25a, 25b and 26a, 26b are lead wires 19a, 19b and 20a, 20b provided on both sides of each pair of terminal portions 21a, 21b provided on the printed circuit board 15 from the notch portions 16a, 16b toward the central portion. The width w of the lead wire 19a, 19b, 20
The outer diameter d is substantially equal to or slightly narrower than the outer diameter d of a and 20b, and is formed so as to satisfy w ≦ d.

Reference numerals 27a and 27b denote protrusions formed at one end of the printed circuit board 15. The protrusions 27a and 27b are formed by cutting off the center of the arc-shaped end of the printed circuit board 15 to form a cutout 28. Are formed by the remaining portions on both sides, and both outer edges thereof are arc portions 5 a of the printed circuit board accommodation portion 5.
The shape matches the shape. The printed circuit board 15
If the outer shape of the printed circuit board 15 is slightly larger than the inner shape of the printed circuit board housing section 5, the printed circuit board 15 can be pressed into the printed circuit board housing section 5 and housed therein, so that the printed circuit board 15 can be stably held.

In the printed circuit board 15 configured as described above, the lead wires 19a, 19b and 20a, 20b respectively connected to the pair of terminal portions 21a, 21b are bent in opposite directions to each other, and then the fitting grooves 25a, 25b are inserted. And 26a, 26b, respectively, and taken out to the opposite side to hold the lead wires 19a, 19b and 20a, 20b apart so that the leads do not adhere to each other. This prevents the lead wires 19a, 19b, 20a, 20b from coming into contact with the wall when the housing 15 is accommodated. At this time, if w <d, the lead wires 19a, 19b, 20
a and 20b are fitting grooves 25a, 25b, 26a and 26b, respectively.
And is securely held in that position.

Thus, the lead wires 19a, 19b,
The printed circuit board 15 to which 20a and 20b are connected is shown in FIG.
As shown in (2), it is housed in the printed circuit board housing part 5, and is filled with the filler 23. Filler 23 has cutouts 16a,
It easily penetrates into the inside of the printed circuit board 15 through the cutout portion 16b and the printed circuit board 15, and the printed circuit board 15, the confirmation light 18, and the lead wires 19a, 19b, 20a, and 20b are sealed in a watertight manner.
Note that the filler 23 can easily flow into the vicinity of the confirmation light 18 by providing the cutout portion 28. At this time, since each lead wire 19a, 19b, 20a, 20b is fitted or press-fitted in the fitting groove 25a, 25b, 26a, 26b, it is held at that position until the filler 23 is solidified and moves. Never.

Since the present embodiment is constructed as described above, the lead wires 19a, 19b, 20a, 2
0b is pulled or bent, the lead wires 19a, 1
There is no gap between 9b, 20a, 20b and the wall surface of the printed circuit board housing part 5, or between the lead wires 19a and 19b, and 20a and 20b, so that the waterproof function does not deteriorate.

Embodiment 2 FIG. 3 shows another embodiment of the printed circuit board 15 according to the present invention. FIG. 3A shows the printed circuit board 15 of the first embodiment, in which the cutout portions 16a and 16b on both sides are formed. Omitted, fitting grooves 25a, 25b, 26a, 26b directly deep from both side edges
(B) is the fitting groove 25 of the embodiment of (a).
The two sides of the entrances of a, 25b, 26a, 26b are cut off to facilitate the fitting of the lead wires 19a, 19b, 20a, 20b and to facilitate filling with the filler 23.

FIG. 3C shows the printed circuit board 15 of the first embodiment in which the cutouts 28 provided at the ends are omitted, and FIG. 4D shows the embodiment of FIG.
27b is omitted, and the end is formed flat. The printed circuit board used in the present invention is not limited to the above embodiment.For example, a fitting groove is provided only on one side edge, or each of the edges perpendicular to the side edge provided with the fitting groove. It can be changed as appropriate, such as providing a cutout.

Embodiment 3 In this embodiment, as shown in FIG. 2, the cap 22 of the confirmation light 18 is made of, for example, polycarbonate resin, and is inserted into the hole 14 provided at the bottom of the printed circuit board housing 5 of the main body 1. And fixed by ultrasonic welding.
Is formed to be larger than the outer shape of the confirmation light 18 and a gap is formed between the two so that the filler 23 can be filled. Thereby, there is no danger of water entering from the mounting portion of the cap 22, and the confirmation light 18 and the cap 2
2 is more reliably held at a predetermined position by the filler filled between the two.

In the above description, the embodiment in which the present invention is applied to the waterproof fire detector shown in FIG. 4 is shown. However, the present invention can be applied to other waterproof fire detectors.

[0027]

As is apparent from the above description, the present invention provides a fitting groove in a printed circuit board to which a lead wire is connected,
Since the lead wire is inserted into the insertion groove and taken out, when the printed circuit board is accommodated in the printed circuit board housing portion and the filler is filled, the lead wire may come into contact with the wall surface of the printed circuit board housing portion or the lead wire. There is no contact between them. In addition, by providing the cutout portion in at least a part of one edge portion of the printed circuit board, the filler can be easily and reliably filled to the inside of the printed circuit board when the filler is filled.

Therefore, when the waterproof fire detector is mounted on the ceiling, a gap is not generated between the lead wire and the filler even if the lead wire is pulled or bent, and therefore water is present in the conductive portion. It is possible to obtain a highly reliable waterproof fire detector excellent in the waterproof function without invasion.

Further, since the confirmation light is provided on the printed circuit board, the cap of the confirmation light protruding outwardly is provided in the printed circuit board accommodating portion, and a gap is provided between the two for filling the filler. The filler filled in the housing portion is filled between the confirmation light and the cap, and these can be securely held and fixed, and the intrusion of water can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the printed circuit board of FIG. 1 is housed in a printed circuit board housing unit.

FIGS. 3A, 3B, 3C, and 3D are plan views of a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a conventional waterproof fire detector.

FIG. 5 is an enlarged cross-sectional view of a conductive portion of FIG.

FIG. 6 is a perspective view showing a printed board accommodating portion and a printed board of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 5 Printed circuit board accommodation part 7a, 7b Electrode 9 Contact 13 Thermal element 15 Printed circuit board 16a, 16b Notch part 18 Confirmation light 19a, 19b, 20, 20b Lead wire 22 Cap 23 Filler 25a, 25b, 26a, 26b Fitting Grooves 27a, 27b Projection 28 Cutout

Continuation of the front page (56) References Japanese Utility Model 3-127987 (JP, U) Japanese Utility Model 1986-188392 (JP, U) Japanese Utility Model 3-127985 (JP, U) Japanese Utility Model 155-1224089 (JP, U) , U) (58) Fields studied (Int. Cl. ⁷ , DB name) G08B 17/00 H05K 3/28

Claims (2)

(57) [Claims] 1. A main body having a substantially box-shaped printed circuit board accommodation part therein and a fire detection part provided on an upper part, and an electrode and a lead wire extending from the fire detection part into the printed circuit board accommodation part. A waterproof fire detector comprising a printed circuit board connected and housed in the printed circuit board housing section and sealed with a filler, wherein a fitting groove for fitting the lead wire into at least one side edge of the printed circuit board is provided. provided Rutotomoni, it provided a fitting insertion groove
A waterproof fire detector, wherein a cutout is provided on at least one edge perpendicular to a side edge . 2. A substantially box-shaped printed circuit board housing portion is provided inside.
A main body having a fire detection unit provided at an upper part thereof;
An electrode extending from the detection section into the printed circuit board housing section; and
Lead wires are connected and housed in the printed circuit board housing section
And a printed circuit board sealed with a filler.
In the waterproof fire detector, the lead is attached to at least one side edge of the printed circuit board.
A fitting groove for fitting a wire is provided, and a straight line is formed on a side edge provided with the fitting groove.
A confirmation light is provided near one of the intersecting edges and
Confirmation lamp caps that protrude outward into the printed circuit board
The cap has an inner shape between the cap and the confirmation light.
A waterproof fire detector formed so that a filler can be filled therein .