JPH08171684A - Photoelectric smoke sensor - Google Patents

Abstract

PURPOSE: To change a 2-terminal photoelectric smoke sensor into the 3-terminal one in a simple way and at a low cost. CONSTITUTION: A printed board 8 has a 3rd hole 42 for a transmission terminal, and a terminal board 3 has a 3rd hole 37 which locks one of both ends of the transmission terminal, and the main body 5 of a smoke detection part has a thin part 46 serving as a hole for the transmission terminal. When the transmission terminal is provided and the board 3 is molded, a conductive metallic parts having a through hole is inserted into the hole 37 in a single body, and furthermore, a 3rd hole is formed at a thin part 46 of the main body 5, and a screw is pierced through the main body 5, the board 8 and the hole 37 of the board 3. Thus the board 8 is electrically connected to the conductive metallic parts of the board 3.

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 which has two terminals, a signal line terminal and a common line terminal, and can additionally have a transfer output terminal.

[0002]

2. Description of the Related Art As a conventional sensor, for example, there is one shown in FIG. In FIG. 7, reference numeral 101 is a receiver, and from the receiver 101 to the signal line 102 and the common line 1
03 are drawn out respectively. A plurality of sensor bases 104 are connected to the extracted signal line 102 and common line 103, respectively, and a sensor body 105 is fitted to each of the sensor bases 104. Sensor base 10
4 has a signal line terminal (S terminal) 106 and a common line terminal (SC terminal) 107, one fitting metal fitting 108 of the sensor body 105 is connected to the S terminal 106, and the SC terminal 107 has a sensor. The other fitting metal fitting 109 of the main body 105 is connected.

Such an S terminal 106 and an SC terminal 107
In a sensor having two terminals, the terminal board housed in the outer cover has a hole for the S terminal 106 and the SC terminal 10.
Holes for 7 are respectively formed, and conductive fittings are insert-molded in these holes. In addition, a hole for the S terminal 106 and a hole for the SC terminal 107 are also formed on the printed circuit board housed in the terminal board. In addition, the S terminal 106 is also attached to the main body of the smoke detection unit fitted to the terminal board.
And a hole for the SC terminal 107 is formed. Screws are inserted into these holes to fix the smoke detector main body, the printed circuit board, the terminal board, and the fitting.

However, in such a sensor having two terminals, the S terminal 106 and the SC terminal 107, for example, when a fire occurs in a hotel room, it is desired to confirm the fire inside the room at the outdoor entrance. In this case, it cannot be confirmed because it does not have a transfer output function. In order to make such a confirmation, for example, as shown in FIG. 8, a sensor having a transfer terminal is known.

In FIG. 8, the sensor base 104 is S
It has a terminal 106, an SC terminal 107, and an R terminal 110 which is a transfer terminal, and a fitting fitting 111 for the R terminal 110 provided on the sensor body 105 is connected to the R terminal 110. As shown in FIG. 9, a fire signal detected by the detection unit 112 of the sensor body 105 is transferred to the R terminal 110 from the R terminal 110 to the outside of the receiver 101 via the input / output unit 113. It

[0006] Such S terminal 106 and SC terminal 107
In a sensor having three terminals, the R terminal 110 and the R terminal 110, the terminal board housed in the outer cover has a hole for the S terminal 106, a hole for the SC terminal 107, and a hole for the R terminal 110, respectively. The metal fittings are insert-molded in these holes. Further, the printed circuit board housed in the terminal board also has holes in the S terminal 106 and SC terminal 107.
And a hole for the R terminal 110 are formed. Further, in the smoke detector body fitted to the terminal board, the hole for the S terminal 106, the hole for the SC terminal 107, and the R terminal 11 are also provided.
Holes for 0 are formed respectively.

[0007] Screws are inserted into these holes to fix the smoke detector main body, the printed circuit board, the terminal board and the fitting.

[0008]

However, in such a conventional sensor, a sensor having two terminals of a signal line terminal and a common line terminal, a signal line terminal, a common line terminal and a transfer terminal are provided. In the case of a sensor having three terminals, the terminal board and the main body of the smoke detection section must be molded using different molds, so the two-terminal sensor cannot be changed to a three-terminal sensor, There was a problem that it was costly.

The present invention has been made in view of the above conventional problems, and a photoelectric smoke capable of easily changing a 2-terminal sensor to a 3-terminal sensor at low cost. The purpose is to provide a sensor.

[0010]

In order to achieve the above-mentioned object, the present invention is directed to a first hole which is housed in an outer cover and which has a conductive fitting having a through hole for a common wire terminal, and a signal wire terminal. Terminal board having a second hole having a conductive metal fitting having a through hole for use therein, a first hole for a common wire terminal housed in the terminal board, and a second hole for a signal wire terminal And a smoke detection section main body having a first hole for a common line terminal fitted to the terminal board and a second hole for a signal line terminal, and a smoke detection section main body , First and second fitting metal for screwing the first board and the second board of each of the printed circuit board and the terminal board by screwing them to electrically connect the printed circuit board and the conductive fittings of the terminal board. And a third hole for a transfer terminal formed in the printed circuit board, the photoelectric smoke sensor including: When the transfer terminal is provided, a third hole that closes one end for the transfer terminal is formed in the slave board, and a thin portion serving as a hole for the transfer terminal is formed in the smoke detection unit main body. When a board is molded, a conductive metal fitting having a through hole in the third hole is integrally insert-molded, and a third hole is further formed in a thin portion of the smoke detecting section main body, and the smoke detecting section main body is formed. A screw is passed through the third hole of the printed board and the terminal board to electrically connect the printed board and the conductive metal fitting of the terminal board.

[0011]

According to the photoelectric smoke detector of the present invention having such a structure, the third hole for the transfer terminal is formed in the printed circuit board and one end for the transfer terminal is closed in the terminal board. The third hole is formed, and a thin portion serving as a hole for the transfer terminal is formed in the smoke detector body. When the transfer terminal is provided, the third hole is integrally formed when molding the terminal board. Conductive metal fittings with through-holes are insert-molded, a third hole is further formed in the thin portion of the smoke detector body, and a screw is inserted through the third hole of the smoke detector body, the printed circuit board, and the terminal board. Since the printed circuit board and the conductive fittings of the terminal board are electrically connected, it is not necessary to separately prepare a mold for molding the terminal board and the smoke detector main body, and only one mold is required. The terminal sensor can be easily changed to a three-terminal sensor at low cost.

[0012] Further, since the conductive metal fitting is designed to be integrally embedded in the hole for screwing to the terminal board by insert molding when molding the terminal board, workability can be improved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are views showing an embodiment of the present invention.
FIG. 3 is a horizontal sectional view of a photoelectric smoke detector showing an embodiment of the present invention, and FIG. 4 is a vertical sectional view of a photoelectric smoke detector showing an embodiment of the present invention.

In FIGS. 3 and 4, reference numeral 1 denotes an outer cover having an opening 2, a terminal board 3 is housed in the outer cover 1, and a shield case 4 is fixed inside the terminal board 3. 5 is a smoke detector body, which is fitted into the fitting groove 6 of the terminal board 3 and has a packing 7 on the smoke detector body 5.
The printed circuit board 8 is attached via. The smoke detector main body 5, packing 7, printed circuit board 8 and terminal board 3 are fixed by screws 10. A smoke detector cover 11 is detachably attached to the lower surface of the smoke detector main body 5.

A plurality of labyrinth members 13 are formed on the inner side of the peripheral wall 12 of the smoke detection unit cover 11, and the labyrinth member 1 is provided.
The reference numeral 3 is formed so as to facilitate the inflow of smoke from the outside and to block the light from the outside. Further, an insect screen 14 is integrally provided on the outside of the peripheral wall 12 of the smoke detector cover 11 to prevent insects from entering and generating scattered light. A plurality of smoke inlets 15 are formed on the peripheral wall 12 of the smoke detector cover 11.

On the lower surface of the smoke detector body 1, holders 16, 1 are provided.
7, the light blocking member 18 and the mounting portion 19 are integrally formed,
The holder 16 houses the light receiving element 20 and the test infrared LED, and the holder 17 houses the smoke detection infrared LED 21. The light shielding member 18 is an infrared LED 21 for smoke detection.
The infrared light emitted from the device is shielded so that it does not directly enter the light receiving element 20. A protrusion 22 formed on the smoke detector cover 11 is inserted into the attachment portion 19, and the smoke detector cover 11 is detachably attached to the smoke detector main body 5.

The lower surface of the smoke detector body 5 and the smoke detector cover 1
Antireflection surfaces 23 and 24 each having a saw-toothed cross section are formed on the inner surface of 1. The antireflection surfaces 23 and 24 receive the direct reflection light even if the infrared light from the smoke detection infrared LED 21 hits them. It is designed to prevent the light from entering the element 20. A space surrounded by the antireflection surfaces 23, 24, the labyrinth members 13, the holders 16, 17 and the like forms a smoke detection chamber 25A. A smoke detection space 25 is formed in the center of the smoke detection chamber 25A.

A light receiving section cover 26 is detachably attached to the holder 16 in which the light receiving element 20 is housed, and a shield cap 27 is attached to the light receiving section cover 26. here,
As shown in FIG. 4, the terminal board 3 has a first wire for common wire terminals.
Hole 28 is formed, and a conductive metal fitting 30 having a hole 29 is insert-molded in the first hole 28. A second hole (not shown) for a signal line terminal is formed on the terminal board 3 on the opposite side of 180 degrees, and a conductive metal fitting is insert-molded in the second hole.

Further, the printed circuit board 8 housed in the terminal board 3 is also formed with the first hole 31 for the common wire terminal.
A second hole (not shown) for a signal line terminal is formed on the opposite side of 0 degrees. Further, a first hole 32 for a common wire terminal is also formed in the smoke detector main body 5 fitted to the terminal board 3,
A second hole (not shown) for a signal line terminal is formed on the opposite side of 0 degrees. A screw hole 33 is formed in the fitting fitting 9. The first hole 32 of the smoke detecting section main body 5, the first hole 31 of the printed circuit board 8, the hole 29 of the conducting metal fitting 30 and the hole 33 of the fitting metal fitting 9 communicate with each other, and the screw 10 connects the smoke detecting body 5 , The packing 7, the printed circuit board 8 and the terminal board 3 are screwed. The same applies to the signal line terminal side on the opposite side not shown by 180 degrees.

Next, FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention. In FIG. 1, the terminal board 3 is housed in the outer cover 1, and the outer peripheral wall 34 of the smoke detecting section main body 5 is inserted into the fitting groove 6 of the terminal board 3, so that the smoke detecting section main body 5 is attached to the terminal board 3. Are fitted. A printed circuit board 8 is provided on the smoke detector main body 5 in the storage portion 35 of the terminal board 3. A packing 7 is interposed between the printed circuit board 8 and the smoke detecting section main body 5 and between the terminal board 3 and the smoke detecting section main body 5.

Reference numeral 36 denotes a mounting portion formed on the terminal board 3, and the mounting portion 36 has a third hole 37 for a transfer terminal. The upper portion of the third hole 37 is closed, and when a transfer terminal is required, a conductive fitting having a through hole is integrally embedded in the hole 37 by insert molding. The printed circuit board 8 is formed with a third hole 42 for a transfer terminal which communicates with the hole of the conductive fitting. That is, as shown in FIG. 2, the printed circuit board 8 has a first hole 3 for a common wire terminal.
1, a second hole 41 for the signal line terminal on the side opposite to the first hole 31 by 180 degrees, and a third hole 42 for the transfer terminal between the first hole 31 and the second hole 41. Are formed respectively.

As shown in FIG.
A transfer terminal 44 having a hole 43 is provided in the hole 42. A transfer output is taken out from the transfer terminal 44 so that the occurrence of a fire in a room such as a hotel can be confirmed from an entrance outside the room. Also, the smoke detection unit body 5
A recess 45 communicating with the hole 43 of the transfer terminal 44 is formed therein, and a thin portion 46 is formed below the recess 45. When using the transfer terminal 44, use a jig to
It is punched out so that it can be screwed.

Next, FIG. 5 is an explanatory view of the assembly of the photoelectric smoke detector. In FIG. 5, the terminal board 3 has a mounting portion for mounting a fitting 9 for mechanical and electrical connection with a base separately mounted on the ceiling surface on the upper surface, and a smoke detecting portion on the lower surface. It has a fitting groove 6 into which the main body 5 is fitted, a mounting portion 36 to which the smoke detection unit main body 5 and the like are mounted, a storage portion 35 which stores the printed circuit board 8 on which an electric circuit is mounted, and the like.

A first hole 28 for the common line terminal is formed in the mounting portion 47, a second hole 49 for the signal line terminal is formed in the mounting portion 48, and a signal is transferred to the mounting portion 36. A third hole 37 for a terminal is formed. Conductive metal fittings are insert-molded in the first to third holes 28, 49 and 37. The shield case 4 is inserted along the inner peripheral surface of the storage portion 35 of the terminal board 3, and the printed circuit board 8 is stored inside thereof.

A first hole 31 for the common line terminal is formed in the printed circuit board 8, a second hole 41 for the signal line terminal is formed on the opposite side of 180 degrees, and the first hole 31 is formed. A third hole 42 for a transfer terminal is formed between the second hole 41 and the second hole 41. Holders 16 and 17 and a light shielding member 18 are erected on the smoke detector main body 5, an antireflection surface 23 is formed on the lower surface, and a mounting portion 19 is formed on the outer circumference in the circumferential direction. The smoke detecting infrared LED 21 is housed in the holder 17, and the light emitting unit cover 50 that covers the smoke detecting infrared LED 21 is attached to the holder 16. Further, the holder 16 accommodates the light receiving element 20 and the test infrared LED 51, and the holder 16 has a light receiving section cover 26 for limiting the field of view of the light receiving element 4 and for introducing smoke. The light receiving section cover 26 is detachably attached to the holder 16 so that the labyrinth member 13 contacts the labyrinth receiving section of the light receiving section cover 26. A shield cap 27 is attached to the light receiving unit cover 26.

A first hole 32 for the common wire terminal is formed in the smoke detector body 5, and a second hole 52 for the signal wire terminal is formed 180 degrees opposite to the first hole 32. A thin portion 46 serving as a transfer terminal hole is formed between the first hole 32 and the second hole 52. The screw 10 is inserted into the first hole 32 of the smoke detector body 5, the printed circuit board 8 and the first hole 31, the first hole 28 of the terminal board 3 and the hole 33 of the fitting 9, and the screw 53. Is the second hole 52 of the smoke detector body 5, the second hole 41 of the printed circuit board 8, and the second hole 49 of the terminal board 3.
And it is inserted into the hole 55 of the fitting 54. Thus
Smoke detection unit main body 5, packing 7, plate substrate 8, terminal board 3
And the fittings 9, 54 are screwed.

Here, when the transfer terminal 40 is provided, when the terminal board 9 is molded, a conductive metal fitting is insert-molded in the third hole, and the thin portion 46 is punched out.
The third hole 42 of the printed circuit board 8, the third hole of the terminal board 3,
Insert a screw (not shown) into the hole of the fitting (not shown),
Screw it in. The protruding portion 22 of the smoke detecting portion cover 11 is inserted into the mounting portion 19 of the smoke detecting portion main body 5, and the smoke detecting portion cover 11 is detachably attached to the smoke detecting portion main body 5. An insect screen 14 is fixed to the outer periphery of the smoke detector cover 11. Finally, the outer cover 1 having the opening 2 is attached to the terminal board 3 to cover the smoke detector main body 5 and the smoke detector cover 11. Outer cover 1
A drain hole 56 and a window 57 for a warning indicator light are formed in the.

Next, the operation will be described. In the monitoring state, the smoke detection infrared LED 21 is intermittently driven under the control of the electronic circuit on the printed circuit board 8, and the smoke detection infrared LED 21 intermittently irradiates the smoke detection space 25 with infrared light. If there is no smoke in the smoke detection space 25, the emitted infrared light does not directly enter the light receiving element 20, so the output level of the sensor is a level corresponding to zero smoke concentration. It is in.

When smoke is generated outside the sensor due to a fire or the like, the smoke is supplied from the opening 2 of the outer cover 1 to the insect screen 14, the smoke inlet 15 of the smoke detector cover 11 and the labyrinth member 13.
And enters the smoke detection space 25. Infrared light is intermittently emitted from the smoke detection infrared LED 21 in the smoke detection space 25, and the smoke that has entered the smoke detection space 25 is
When this infrared light hits, it is scattered by smoke particles, and the scattered light is incident on the light receiving surface of the light receiving element 20.

The incident light is photoelectrically converted by the light receiving element 20 and detected by the light receiving circuit, the detection signal is amplified by the amplifying circuit and applied to the transmission control circuit, and the transmission control circuit receives the signal via the response signal output circuit. Output to. Here, for example, in the case of manufacturing a sensor having a transfer terminal that outputs a fire in a room such as a hotel to an entrance outside the room, as shown in FIG. A conductive metal fitting 39 having a hole 38 in the third hole 37 is insert-molded, the thin portion 46 of the smoke detector body 5 is punched out by a jig, and the third hole 60 of the smoke detector body 5 is formed by punching. , Screws 43 are inserted into the holes 43 of the transfer terminals 44 of the printed circuit board 8, the holes 37 of the conductive metal fittings 39 insert-molded in the third holes 37 of the terminal board 3, and the holes 59 of the fitting metal fittings 58, and screwed. I do. In this way, the transfer output can be taken out from the transfer terminal 44 to the outside.

[0031]

As described above, according to the present invention, it is not necessary to mold the terminal board and the smoke detector main body by using separate molds, and only one mold is required. Can be easily changed to a three-terminal sensor at low cost.

[Brief description of drawings]

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

FIG. 2 is a perspective view of a printed circuit board.

FIG. 3 is a cross-sectional view of a photoelectric smoke detector.

FIG. 4 is a vertical sectional view of a photoelectric smoke detector.

FIG. 5 is an explanatory view of assembly of a photoelectric smoke detector.

FIG. 6 is an operation explanatory diagram

FIG. 7 is an explanatory diagram of a conventional 2-terminal sensor.

FIG. 8 is an explanatory diagram of a conventional 3-terminal sensor.

FIG. 9 is a diagram showing a sensor body.

[Explanation of symbols]

 1: Outer cover 2: Opening 3: Terminal board 4: Shield case 5: Smoke detection unit body 6: Fitting groove 7: Packing 8: Printed circuit board 9, 54, 58: Fitting metal fittings 10, 53, 61: Screw 11 : Smoke detection section cover 12: Peripheral wall 13: Labyrinth member 14: Insect screen 15: Smoke inlet 16, 17: Holder 18: Shading member 19, 36, 47, 48: Mounting part 20: Light receiving element 21: Infrared ray for smoke detection LED 22: Protrusions 23, 24: Antireflection surface 25: Smoke detection space 25A: Smoke detection chamber 26: Light receiving part cover 27: Shield cap 28, 31, 32: First hole 29, 33, 38, 43, 55 , 59: Holes 30, 39: Conducting metal fittings 34: Outer peripheral wall 35: Storage parts 37, 42, 60: Third holes 41, 49, 52: Second holes 44: Transfer terminals 45: Recesses 46: Thin parts 50: Light emitting part Over 51: Test for infrared LED 56: drain hole 57: window

Claims (1)

[Claims] 1. A first hole having a conductive fitting having a through hole for a common wire terminal and a second hole having a conductive fitting having a through hole for a signal wire terminal, which is housed in an outer cover. A formed terminal board, a printed board that is housed in the terminal board and has a first hole for a common wire terminal and a second hole for a signal wire terminal, and a common that is fitted to the terminal board. A smoke detecting section main body having a first hole for a wire terminal and a second hole for a signal line terminal, and a first hole for each smoke detecting section main body, a printed board, and a terminal board, and a second hole. A photoelectric smoke detector, comprising: a first fitting metal fitting and a second fitting fitting, which penetrates a screw into the hole and is screwed, and electrically connects the printed circuit board and the conductive fitting of the terminal board. A third hole for the transfer terminal is formed, and a third hole for closing one end for the transfer terminal is formed in the terminal board. When a thin-walled portion serving as a hole for a transfer terminal is formed in the smoke detection unit body and the transfer terminal is provided, a through hole is integrally provided in the third hole when molding the terminal board. Conductive metal fittings are insert-molded, and a third part is attached to the thin part of the smoke detector body.
And a screw is penetrated through the third portion of the smoke detection unit main body, the printed circuit board, and the terminal board to electrically connect the printed circuit board and the conductive metal fittings of the terminal board. Smoke detectors.