JPH09373U - Fire detector - Google Patents

Abstract

It is an object of the present invention to realize a fire detector having various characteristics such as a circuit mounting area which can be approximately doubled as compared with a conventional single printed circuit board. . According to the present invention, in a fire detector having a structure in which a printed circuit board on which a detector circuit is mounted is incorporated into a circuit housing formed behind a fire detector protected by a cover, a detector circuit is provided. The printed circuit board is divided into a first printed circuit board and a second printed circuit board, a circuit element is mounted on at least one surface of the first printed circuit board, and the two printed circuit boards pass through the insulating body and have a plurality of columns vertically arranged. By mounting the protrusion on the one surface of the first printed circuit board by the column protruding on the lower side of the insulating body, stacking the second printed circuit board, and providing at least one column on the first and second printed circuit boards. The first and second printed circuit boards are positioned and supported and fixed by being inserted into the through holes, and the columns and the first and second printed circuit boards are electrically connected by soldering and at the same time mechanically supported. Fixed In this state, the fire detector was built into the circuit compartment.

Description

[Detailed description of the device]

[0001]

TECHNICAL FIELD OF THE INVENTION

 The present invention relates to a fire detector that detects a fire and sends a detection signal to a receiver.

[0002]

[Prior art]

 In the conventional fire detector, the electric circuit section is composed of one printed circuit board, and the circuit element that constitutes the electric circuit section such as the signal processing circuit or the lead of the fire detection element is connected to this one printed circuit board. It was installed.

[0003]

[Problems to be solved by the device]

 As described above, the electric circuit part of the conventional fire detector is composed of a single disk-shaped printed circuit board, and this circuit board is housed in a cylindrical body. For this reason, many circuit elements such as the fire detection circuit section and transmission system circuit section are mounted on a single printed circuit board, so that the area occupied by the ceiling surface of the sensor body mounted on the ceiling is wide and the diameter direction There was a problem that it was not possible to meet the demand for miniaturization.

In the present invention, the electric circuit part of the fire detector is composed of two printed boards. Then, one printed circuit board is configured with a fire detection circuit unit such as a light emitting circuit. Further, the other printed circuit board is composed of a transmission system circuit such as an A / D conversion circuit. As a result, the size of the detector body in the diametrical direction is made extremely small, and a small fire detector that is convenient for maintenance and inspection is realized.

[0005]

[Means for Solving the Problems]

 The present invention relates to a fire detector having a structure in which a printed circuit board on which a detector circuit is mounted is incorporated in a circuit housing formed behind a fire detector protected by a cover, and the detector circuit is a first printed circuit. A circuit element is mounted on at least one surface of the first printed circuit board by dividing it into a board and a second printed circuit board. A pillar protruding to the lower side of the main body is used to mount it on one surface of the first printed board, stack the second printed board, and at least one pillar is a through hole provided in the first and second printed boards. The first and second printed circuit boards are positioned and supported / fixed by inserting them through the board, and the columns and the first and second printed circuit boards are electrically connected by soldering and at the same time mechanically supported and fixed. Times This is a fire detector built into the road compartment. In addition, a fire detector is constructed by mounting circuit elements on the surfaces of the first and second printed boards that face each other.

The first and second printed circuit boards, which are divided into an analog fire detection circuit section and a digital transmission circuit section, are arranged in parallel by a plurality of columns and electrically and mechanically connected to each other. Then, it is mounted inside the cylindrical body. Inside the main unit, the first printed circuit board that constitutes the fire detection circuit section is arranged on the lower side near the dark box as an example of the fire detection section, and the second printed circuit board that forms the transmission system circuit section is provided on it. To be The functions of the two printed circuit boards are individually checked.

The fire detector thus configured is connected to the receiver by mounting the second printed circuit board side on a base mounted on the ceiling. The IC and signal line in the digital circuit of the second printed circuit board, which becomes the noise source, can be separated from the analog first printed circuit board, which is vulnerable to noise, and is hardly affected by noise.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

 Embodiment 1 FIG. 1 is a vertical cross-sectional view of Embodiment 1 of the present invention, and FIG. 2 is a bottom view showing a state where a cover is removed. In FIGS. 1 and 2, 1 is a cylindrical sensor body, 11 is an annular stepped portion provided on the lower portion of the inner wall of the body 1, 12 is a plurality of hooks formed on the lower edge of the inner wall, and 13 is the bottom portion of the inner wall. A plurality of step portions projecting inside of the step portion 14 are through holes provided in the step portion 13. Reference numeral 15 is a mounting screw which is inserted into the through hole 14 and constitutes an input / output terminal, and 16 is an adjusting hole for address setting and volume adjustment.

Reference numerals 2 and 2a are first and second printed circuit boards. Circuit elements such as a hybrid IC 21 are attached to the first printed board 2. Electronic components such as the MPU 25 and the 8-bit dip switch 26 are attached to the second print substrate 2a. Reference numeral 28 is a confirmation light (see FIG. 2), and 29 is a nut corresponding to the mounting screw 15 and fixed to the second printed circuit board 2a.

A plurality of columns 3 mechanically and electrically couple the first and second printed circuit boards 2 and 2 a arranged in parallel to each other vertically. As shown in FIG. 3 and FIG. 4, the support column 3 includes a conductive column 30 having a small diameter through hole insertion portion 31 at both ends and a large diameter portion 32 formed in the center, and a rectangular binding piece 33 made of an insulating material. Become. The pillar 3 is integrally formed by continuously resin-molding a plurality of conductive columns 30 provided at equal intervals and a binding piece 33 connected by a thin connecting portion 35. Then, by cutting at the thin connecting portion 35, the pillar 3 composed of one or a desired number of conductive pillars 30 insulated by the binding piece 33 can be selectively configured.

Reference numeral 4 is an optical table, 41 is a convex portion projecting from the center of the upper surface of the optical table 4, 42 is a hook provided at a plurality of peripheral positions, and 43 is a locking provided corresponding to the hook 12 of the main body 1. Is a department. Reference numeral 44 is a light projecting element provided on the lower surface of the optical table 4, and 45 is a light receiving element. Further, 46 is a test lamp provided so as to face the light receiving element 45, 47 is a cutout portion into which the confirmation lamp 28 is inserted, 48 is a labyrinth formed on the periphery of the optical table 4, and 49 is a lower part of the optical table 4. A dark box is formed with the labyrinth 48 and the like by an optical table cover that covers the. 5 is an insect net around the dark box 40, 6 is a sensor cover, 61 is a smoke inlet, and 62 is an engaging portion provided corresponding to the hook 42.

FIG. 5 is a block diagram showing a connection state of the electric circuit section constituted by the first and second printed circuit boards 2 and 2a. Reference numeral 51 is a light emitting circuit for making the light projecting element 44 pulse-light, 52 is a light receiving amplifier circuit for converting the amount of light received by the light receiving element 45 into an electric signal and amplifying it, and 53 is a peak hold circuit. The light emission cycle and the light emission time of pulse lighting of the light projecting element 44 in the light emitting circuit 51 are controlled by the control circuit described below. The peak hold circuit 53 is for holding the peak value of the output signal of the photoreceiver / amplifier circuit 52 and sending it to the next stage.

Reference numeral 54 is an A / D conversion circuit, 55 is a control circuit, 56 is a transmission / reception circuit, and 57 is a constant voltage circuit. The A / D conversion circuit 54 converts the analog output signal held by the peak hold circuit 53 into a digital signal. Further, the control circuit 55 is composed of an 8-bit MPU or the like here, and in addition to the control operation of the light projecting element 44 described above, performs the function of transmitting and receiving with the receiver via the transmitting and receiving circuit 56. Reference numeral 58 is a functional test circuit for turning on the test lamp 46 to perform a functional test, and 59 is a check lamp lighting circuit for turning on the check lamp 28. Thus, the first printed board 2 mainly constitutes an analog fire detection circuit section, and the second printed board 2a mainly constitutes a digital transmission circuit section.

The fire detector of the present invention constructed as above is assembled as follows. After fixing the plurality of support columns 3 and attaching the light projecting / receiving elements 44, 45, etc. to the first printed circuit board 2 mounted on the optical stand 4, the respective support columns 3 allow the first and second printed circuit boards 2a to be mounted. And are connected. The electric circuit part consisting of the two printed circuit boards 2 and 2a connected to each other is housed in the main body 1 which is the circuit housing part, the optical base 4 is locked to the main body 1, and the two mounting screws 15 are screwed in. The main body 1, the printed circuit boards 2 and 2a, and the dark box 40 are integrated. After the detector cover 6 is put on the dark box 40, the amount of light emitted from the test lamp 46 is adjusted, the address is set by the dip switch 26, etc., and the fire detector of FIG. 1 is assembled.

The fire detector assembled in this manner is attached to a base (not shown) attached to the ceiling together with other fire detectors via mounting screws 15, and is not shown through wiring. Each line is connected in parallel to the receiver. Each fire detector connected to the receiver has an address and is set by the 8-bit DIP switch 26 at the time of manufacture or installation.

The fire detector in the fire alarm device operates as follows. The fire detector periodically monitors the space in the dark box 40, which is an example of a fire detection unit formed by the optical base 4 and the optical cover 49, via the light receiving element 45 in the main body 1, and smoke in the internal space at that time. The density of is converted into an electric signal by the light receiving and amplifying circuit 52 and is held. On the other hand, a receiver (not shown) periodically sends a call signal to each sensor. When a specific fire detector is designated by the call signal of the receiver based on the set address, the designated fire detector receives the output signal corresponding to the smoke concentration held through the mounting screw 15. To the machine.

When smoke generated by a fire flows into the dark box 40, the light projected by the light projecting element 44 is scattered in the dark box 40. The scattered light is received by the light receiving element 45, and the electric signal corresponding to the density of smoke held in the light receiving and amplifying circuit 52 up to now increases. When the increased electric signal exceeds a predetermined value, a fire signal is generated on the receiver side. At the same time, a lighting command is issued from the receiver to the designated fire detector to the confirmation light lighting circuit 59, and the confirmation light 28 of the fire detector whose smoke concentration exceeds the predetermined value is lit and a fire occurs. The location will be informed.

Further, when a test signal is sent from the receiver to a predetermined fire detector during maintenance / inspection, the test lamp 46 in the dark box 40 is synchronized with the above monitoring period via the function test circuit 58. Then blinks. As a result, the light receiving element 45 receives light equivalent to the smoke density at the time of fire, and the normal or abnormal operating state of the entire fire alarm device including each fire detector and receiver is checked.

In the above-mentioned embodiment, the case where the present invention is applied to the photoelectric smoke detector using the light emitting / receiving elements 44 and 45 has been described as an example. However, other fire detection in ion chambers, semiconductors, etc. The present invention can be applied to a fire detector that detects a fire phenomenon such as smoke, heat, or flame depending on the element.

[0020]

[Effect of the invention]

 The present invention relates to a fire detector having a structure in which a printed circuit board on which a detector circuit is mounted is incorporated in a circuit housing formed behind a fire detector protected by a cover, and the detector circuit is a first printed circuit. A circuit element is mounted on at least one surface of the first printed circuit board by dividing it into a board and a second printed circuit board. A pillar protruding to the lower side of the main body is used to mount it on one surface of the first printed board, stack the second printed board, and at least one pillar is a through hole provided in the first and second printed boards. The first and second printed circuit boards are positioned and supported / fixed by inserting them through the board, and the columns and the first and second printed circuit boards are electrically connected by soldering and at the same time mechanically supported and fixed. Times A fire detector built into the road compartment was constructed. In addition, a fire detector in which circuit elements are mounted on the opposite surfaces of the first and second printed circuit boards is constructed.

By adopting such a configuration, the present invention can be incorporated in the main body of the fire detector in a state where two printed circuit boards are overlapped with each other with a plurality of columns interposed therebetween. Even if the sensor housing becomes smaller due to the miniaturization of the sensor, the circuit mounting area can be doubled compared to the case where one conventional printed circuit board is incorporated. For example, a transmission control circuit is provided. Even an analog type fire detector circuit can be installed in the circuit compartment with a sufficient margin.

Further, since two printed circuit boards can be electrically and mechanically connected and fixed by soldering with a support provided between them, and a supporting structure such as a screw is not required separately, mounting of electric parts on the printed circuit boards is possible. A hierarchical built-in structure can be realized through the process, and production efficiency is high, so cost can be reduced. Furthermore, in a stacked structure in which two printed circuit boards are electrically and mechanically connected with a support interposed therebetween, circuit elements are protected by mounting circuit components on the inner surfaces of the two printed circuit boards facing each other. It is also possible to achieve the above-mentioned effects and further increase the circuit mounting area.

[Brief description of drawings]

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

FIG. 2 is a bottom view of FIG. 1 showing a state in which a cover is removed.

FIG. 3 is a front view of the printed circuit board portion of FIG.

4A and 4B are a bottom view and a side view of the binding piece.

FIG. 5 is a block diagram showing a connection state of an electric circuit unit.

[Explanation of symbols]

 1 Main Body 2 1st Printed Circuit Board 2a 2nd Printed Circuit Board 3 Support 4 Optical Stand 5 Insect Repellent 6 Sensor Cover 11 Annular Step 12 Hook 13 Step 14 Through Hole 15 Mounting Screw 21 Hybrid IC 25 MPU 26 DIP Switch 28 Confirmation Light 29 Nut 30 Conductive Column 31 Through Hole Insertion Part 32 Large Diameter Part 33 Binding Part 35 Coupling Part 40 Dark Box 41 Convex Part 42 Hook 43 Locking Part 44 Light-Emitting Element 45 Light-Receiving Element 46 Test Light 47 Notch 48 Labyrinth 49 Optical Base Cover 51 light emitting circuit 52 light receiving amplification circuit 53 peak hold circuit 54 A / D conversion circuit 55 control circuit 56 transmission / reception circuit 57 constant voltage circuit 58 functional test circuit 59 confirmation light lighting circuit 61 smoke inlet 62 engagement part

Claims (2)

[Utility model registration claims] 1. A fire detector having a structure in which a printed circuit board on which a detector circuit is mounted is incorporated in a circuit housing formed behind a fire detector protected by a cover, wherein the detector circuit is a first circuit. A printed circuit board and a second printed circuit board, and a circuit element is mounted on at least one surface of the first printed circuit board. The two printed circuit boards penetrate the insulating body and have a plurality of pillars vertically. The support is mounted on one surface of the first printed circuit board by the support protruding from the lower side of the insulating body, and the second printed circuit board is superposed, and at least one support is provided in the first and second support boards. The first, by inserting through a through hole provided in the printed circuit board,
The second printed circuit board is positioned, supported and fixed, and further electrically connected by soldering the support pillars to the first and second printed circuit boards, and at the same time, mechanically supported and fixed and incorporated in the circuit housing section. Fire detector characterized by that. 2. A circuit element is mounted on opposite surfaces of the first and second printed circuit boards.
Fire detector as described.