JP6147015B2 - Termination device - Google Patents

Description

  The present invention relates to a termination device connected to the termination of a sensor line.

For example, in a conventional fire alarm system, a fire receiver is installed in the central monitoring room, a line line and a common line are provided from the fire receiver as a detector line, and the line line and the common line are terminated resistors. Some are connected via a cable (for example, see Patent Document 1).
Such a fire receiver is called a P-type fire receiver, and judges a fire or the like by comparing the voltage between the line line and the common line with each threshold value such as a fire threshold value and a disconnection threshold value.

In the fire alarm system described in Patent Document 1, abnormalities in the wiring of the sensor line can be determined, but when a fault (abnormality) occurs in the fire detector, the fire receiver displays a voice or indication of the fault in the fire detector. Etc. could not be notified.
In order to notify the fire receiver that a failure has occurred in the fire detector, use a fire detector with a self-inspection function that outputs a signal such as a pulse to the fire receiver when a failure has occurred in the fire detector. At the same time, there is a problem in that it must be replaced with a dedicated fire receiver (for example, R type) that communicates with the fire detector.

Therefore, it is conceivable to have a fire alarm facility that can notify a malfunction that has occurred in a fire detector even if it is not a dedicated fire receiver without replacing an existing fire receiver, and a fire detector that is used for it. .
In this case, the fire sensor connected to the end of the sensor line receives a signal from the fire sensor via the sensor line, and when the abnormal signal is received, the terminal resistor is connected to the sensor line. It is conceivable to add a function for intermittent disconnection. By adding this function, even if it is not a dedicated fire receiver, the existing fire receiver can notify the malfunction of the fire detector, whether the wiring of the sensor line is broken, or the malfunction of the fire detector Can be determined by the fire receiver.

Therefore, the fire sensor connected to the end of the sensor line receives a signal from the fire sensor via the sensor line and intermittently connects the terminal resistor to the sensor line when an abnormal signal is received. It is necessary to install a device equipped with a function of disconnecting.
Conventionally, when adding a function to a fire detector, like the fire detector repeater described in Patent Document 2, a hole is made in the detector base to secure a space for the additional device, and further on the installation surface. A large hole was drilled and an additional device was embedded in the installation surface.

JP-A-6-176289 Japanese Patent Laid-Open No. 7-225885

Therefore, it has to be replaced with a fire detector or a detector base dedicated to mounting the additional device, and there is a problem that costs are increased.
In addition, the above-described mounting method has a problem in that it is necessary to repair a hole formed in the installation surface when changing the installation location.

  The present invention has been made to solve the above-described problems, and receives a signal from a fire sensor via a sensor line that can be attached to a fire sensor and an existing sensor base, and detects an abnormal signal. It is an object of the present invention to provide a termination device having a function of intermittently disconnecting the connection between the termination resistor and the sensor line when receiving the signal.

A termination device according to the present invention includes a printed circuit board having a termination resistance and a wiring cord electrically connected to the printed circuit board, and is a hole that is attached to the installation surface and draws the sensor line into the interior. a sensor base gland is formed, and the fire detector which is fixed to the sensor base, is storable configured between air formed between the provided sensor base, sensor lines are connected The printed circuit board receives an abnormal signal from the fire sensor via the sensor line, and when the abnormal signal is received, the printed circuit board connects the terminating resistor and the sensor line. Disconnect the connection .

  The termination device according to the present invention can be attached to the fire sensor and the existing sensor base, so that it is not necessary to replace the dedicated fire sensor and the sensor base, thereby reducing the cost.

It is an example of outline composition of fire alarm equipment provided with a termination device concerning an embodiment of the invention. It is an example of a structure of the control circuit mounted in the termination | terminus apparatus which concerns on embodiment of this invention. It is a side view of the fire sensor and the existing sensor base to which the termination | terminus device which concerns on embodiment of this invention is attached. FIG. 4 is a front view of the sensor base shown in FIG. 3. 1 is an exploded perspective view of a termination device according to an embodiment of the present invention, and a top view of a substrate cover of the termination device. It is the perspective view which notched one end part of the termination | terminus apparatus which concerns on embodiment of this invention. FIG. 4 is a front view of the sensor base shown in FIG. 3 to which a termination device according to an embodiment of the present invention is attached.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, in the following drawings, the relationship of the size of each component may be different from the actual one.
Embodiment.
FIG. 1 is a schematic configuration example diagram of a fire alarm facility 100 provided with a termination device 40 according to an embodiment of the present invention. In FIG. 1, three fire detectors 20 are provided, and a termination device 40 including a termination resistor 15 is connected to the sensor line 3 at the fire sensor 20 at the end of the sensor line 3. It is composed. This terminator 40 is connected to the end of the sensor line 3 with respect to the fire receiver 1, and connects the terminating resistor 15 to the sensor line 3 in a normal state to cause a minute current to flow so that the sensor line 3 is terminated. It is a device that informs the fire receiver 1 that it is connected to the fire detector 20 and is not disconnected in the middle, and that there is no abnormality in the fire detector 20. Here, in the present embodiment, the number of fire detectors 20 is three, but is not limited thereto.

The fire alarm system 100 is capable of notifying a malfunction that has occurred in each of the fire detectors 20 and making it possible to grasp the malfunction by causing the fire receiver 1 to give an alarm.
The fire alarm system 100 includes a fire detector 20 installed in each room of a building (for example, a hotel, an apartment house such as a condominium, an office building, a commercial facility, etc.) and an alarm based on the detection result of the fire detector 20. The P-type fire receiver 1 is connected by a common line 3A and a line line 3B which are sensor lines 3. The P-type fire receiver means that the electrical contact of the fire sensor 20 connected to the sensor line 3 composed of the common line 3A and the line line 3B is closed, thereby causing an electrical change in the sensor line 3. The fire is judged based on this.
Further, the P-type receiver passes a minute current through the sensor line 3 via the termination resistor 15, and determines the disconnection of the sensor line 3 when the minute current due to the termination resistor 15 stops flowing.
Hereinafter, the common line 3A and the line line 3B may be collectively referred to as a sensor line 3.

FIG. 2 is an example of the configuration of the control circuit 10 mounted on the termination device 40 according to the embodiment of the present invention.
The termination device 40 includes a control circuit 10, and the control circuit 10 is provided with a reception circuit 12, a constant voltage circuit 11, a disconnection circuit 14, a determination circuit 13, and a termination resistor 15 as shown in FIG. The terminating resistor 15 is connected to the disconnect circuit 14 and the sensor line 3.
The receiving circuit 12 monitors the voltage of the sensor line 3. That is, the receiving circuit 12 of the termination device 40 receives the abnormal signal from the fire detector 20 via the sensor line 3.
The constant voltage circuit 11 supplies a predetermined constant voltage for operation to the receiving circuit 12 or the like.
The disconnect circuit 14 controls the connection between the termination resistor 15 and the sensor line 3 based on the output of the determination circuit 13. That is, when the discrimination circuit 13 discriminates that any of the fire detectors 20 is defective, the discrimination circuit 13 outputs an output corresponding to the discrimination result, and the disconnection circuit 14 that receives the output outputs the sensor circuit 3 and the termination resistor 15. The operation of disconnecting, connecting after a predetermined time elapses, and disconnecting again after a predetermined time elapses is repeated.

  As a result, even the P-type fire receiver 1 can detect an intermittent disconnection of the sensor line 3 as an abnormal signal and can alarm the abnormality intermittently. be able to. That is, since the fire alarm system 100 according to the present embodiment has the termination device 40 connected to the end of the sensor line 3, a dedicated fire receiver that can receive and control the result of the self-inspection of the fire sensor 20 is used. Even if there is no fire receiver 1, the malfunction of the fire detector 20 can be notified.

FIG. 3 is a side view of the fire sensor 20 and the existing sensor base 50 to which the termination device 40 according to the embodiment of the present invention is attached. FIG. 3 shows a state in which the sensor base 50 is attached to the ceiling 30 and the fire sensor 20 is fixed to the sensor base 50.
Next, a smoke detector as an example of the fire detector 20 to which the termination device 40 according to the present embodiment is attached will be described.

The fire detector 20 includes a case main body 21 that forms the exterior of the fire detector 20 and a smoke detection unit 25 provided in the case main body 21.
The case body 21 has a circular shape in plan view, and the front surface 22 is provided with a lid portion 24 projecting from the rear surface 27 toward the front surface 22 and between the lid portion 24 and the surface 22 of the case main body 21. And an opening 26 for introducing smoke.
The lid portion 24 is configured integrally with the case main body 21 via the extending portion 23.
A plurality of blade fittings (not shown) are provided on the back surface 27 of the case body 21 along the circumferential direction. The blade fitting will be described later.

Next, the internal structure of the case body 21 including the smoke detection unit 25 will be described.
The smoke detection unit 25 is configured, for example, in a cylindrical shape, and the entire outer peripheral surface of the side surface portion is configured as an introduction portion for introducing smoke. The outer peripheral surface of the side surface portion is constituted by an insect repellent wire net or the like so that a gas such as smoke can pass and insects do not enter.

  Further, inside the smoke detection unit 25, a light emitting element (not shown) and a light receiving element (not shown) are concentric, and a line segment connecting the center of the concentric circle with each of the light emitting element and the light receiving element is a predetermined number. They are arranged at an angle. The light emitting element and the light receiving element constitute a smoke sensor (not shown) for detecting intruding smoke.

  The smoke detection unit 25 periodically emits light from the light emitting element. When the smoke enters, the smoke detection unit 25 diffuses the light by the smoke particles that have entered, so that the light reaches the light receiving element and outputs the light reception state to the alarm control unit (not shown) as the smoke detection result. . The inside of the smoke detection unit 25 is formed in, for example, a labyrinth, and external light does not enter the smoke detection unit 25 directly or indirectly, so that the external light is received by the light receiving element. It does not affect smoke detection.

FIG. 4 is a front view of the sensor base 50 shown in FIG.
Next, the structure of the sensor base 50 to which the termination device 40 according to the present embodiment is attached will be described.
The sensor base 50 is circular in plan view like the case main body 21 and is provided with four conductive terminal portions 51 and four blade receiving brackets 52 integrally formed with the terminal portions 51 along the circumferential direction. Similarly, two screw holes 53 are formed along the circumferential direction, and a drawing port 54 is formed at the center.
Here, in the present embodiment, the number of the terminal portions 51 and the blade brackets 52 is four, and the number of the screw holes 53 is two, but is not limited thereto.

The screw hole 53 is provided to attach the sensor base 50 to the installation surface (the ceiling 30 in the present embodiment) with screws.
The blade brackets 52 are for fixing the fire detector 20 to the sensor base 50, and are provided in the same number as the blade brackets in pairs with the blade brackets provided on the back surface 27 of the fire detector 20. FIG. As shown in FIG. 5, the blade bracket is coupled to the blade receiving bracket 52 by rotating the back surface 27 of the fire detector 20 together with the surface of the sensor base 50 attached with screws with the back surface facing the ceiling 30. The fire sensor 20 is fixed to the sensor base 50.

  The inlet 54 is a hole provided for drawing the sensor line 3 (common line 3A and line 3B) from the outside into the sensor base 50. The inlet 54 is drawn into the sensor base 50 from the inlet 54. The sensor line 3 is connected to the terminal unit 51. The fire detector 20 is electrically connected to the sensor line 3 through a blade fitting combined with a blade receiving fitting 52 formed integrally with the terminal portion 51.

FIG. 5A is an exploded perspective view of the termination device 40 according to the embodiment of the present invention, and FIG. 5B is a top view of the substrate cover 60 of the termination device 40.
The termination device 40 includes a printed circuit board 41 having a wiring pattern and a control circuit 10 provided with circuit components mounted thereon (not necessarily strictly convex), and soldering to the printed circuit board 41. It is composed of two wiring cords 42 and a substrate cover 60 that are electrically connected by attachment. The wiring cord 42 is soldered so as to extend in the convex direction of the printed circuit board 41.
The substrate cover 60 is formed of a resin of an insulator having a semi-cylindrical shape or a half-moon shape (not necessarily exactly a semi-cylindrical shape or half-moon shape), and a flat surface (one end surface) 64 opposite to the arc-shaped surface is formed. The opening is open and the inside is hollow, and the printed circuit board 41 is attached to the inside for protection. Locking portions 61 are provided at both ends inside the substrate cover 60, and when the printed circuit board 41 is inserted to a predetermined position in the substrate cover 60, the hook-shaped locking portion 61 is inserted into the printed circuit board 41 in the (insertion direction). The printed board 41 can be attached to the board cover 60 while holding the end 44 (on the opposite side). Therefore, it is possible to prevent the printed circuit board 41 from being displaced from or removed from the substrate cover 60.

  A notch 43 is formed in a part of the convex portion of the printed circuit board 41 of the termination device 40 at a position shifted from the center, and when the printed circuit board 41 is inserted in the correct direction in the substrate cover 60, A protrusion 63 is provided at a position facing the notch 43. Therefore, when the printed board 41 is attached to the board cover 60, the printed board 41 cannot be inserted to a predetermined position in the board cover 60 unless it is inserted in the correct direction, and the printed board 41 cannot be held by the locking portion 61. A mistake in the mounting direction can be prevented.

FIG. 6 is a perspective view in which one end of the termination device 40 according to the embodiment of the present invention is cut out.
As shown in FIG. 5 (b), a cord holding portion 62 having two holes communicating with the outside is provided at both ends inside the substrate cover 60 and inside the locking portion 61. When inserting the board 41, first, the two wiring cords 42 extending from the printed board 41 are respectively passed from the inside of the board cover 60 to the outside through one of the holes of the cord holding parts 62 at both ends.
After that, as shown in FIG. 6, the printed board 41 is inserted into the board cover 60, and when the locking portion 61 holds the end 44 of the printed board 41, the cord holding portions 62 of both ends are folded so that the wiring cord 42 is folded back. The other holes are passed from the outside toward the inside of the substrate cover 60.

  The connection portion between the printed board 41 and the wiring cord 42, that is, the soldered portion is weak in strength, and an external force is applied to the wiring cord 42 and it is easy to remove from the printed board 41 when pulled. Therefore, by attaching the wiring cord 42 to the cord holding portion 62 of the substrate cover 60 as described above, the wiring cord 42 is wound around the cord abutting portion formed between the two holes of the cord holding portion 62. Since the force is absorbed by the cord holding portion 62 regardless of the direction in which the wiring cord 42 is pulled, it is possible to prevent the wiring cord 42 from being removed from the printed circuit board 41 by an external force.

FIG. 7 is a front view of the sensor base 50 shown in FIG. 3 to which the termination device 40 according to the embodiment of the present invention is attached. As shown in FIG. 7, the terminating device 40 is sized so that the length and width (horizontal direction in FIG. 7) can be accommodated in the inlet 54 of the sensor base 50, and the thickness (in the direction orthogonal to the plane of FIG. 7). In addition, the thickness of the space of the inlet 54 formed between the sensor base 50 and the fire sensor 20 fixed to the sensor base 50 is thinner.
Therefore, the termination device 40 can be housed and attached in the space of the inlet 54 formed between the installation surface, the existing sensor base 50, and the fire sensor 20 fixed thereto.
At this time, the wiring cord 42 of the termination device 40 is connected to the terminal portion 51 of the sensor base 50, and the termination device 40 is electrically connected to the sensor line 3 that is also connected to the terminal portion 51 via the terminal portion 51. Connected to.

  As described above, an abnormal signal is received from the fire detector 20 via the sensor line 3, and when the abnormal signal is received, the termination resistor 15 and the sensor line 3 are disconnected intermittently. The termination device 40 can be attached to the fire sensor 20 and the existing sensor base 50. Therefore, even if it is desired to add the above function to a fire alarm facility that does not have the above function, it can be realized by attaching the termination device 40 to the fire sensor 20 connected to the termination of the sensor line 3 and the existing sensor base 50. Because it is not necessary to replace the dedicated fire detector and sensor base, the cost can be reduced.

  Further, the termination device 40 can be easily attached to the fire detector 20 and the existing sensor base 50, and even if attached, about half of the space of the lead-in port 54 is vacant, so the sensor line 3 is connected from the outside. There is no need to provide a new hole for drawing into the sensor base 50.

  Moreover, since the termination | terminus apparatus 40 can be attached to the fire detector 20 and the existing detector base 50, the fixed height (up-down direction of FIG. 3) of the fire detector 20 does not change before and after attachment. Changing the fixed height of the fire detector 20 affects the smoke detection performance, but the fixed height of the fire detector 20 does not change, so it affects the smoke detection performance of the fire detector 20. You do n’t have to.

  Further, even if the termination device 40 is attached to the fire detector 20 and the existing sensor base 50, it is not necessary to make a large hole in the installation surface such as the ceiling 30, so that the installation surface can be restored when the installation location is changed. There is no need to be a big deal.

  Further, since the latching portions 61 are provided at both ends inside the substrate cover 60, the printed circuit board 41 is prevented from being displaced from or detached from the substrate cover 60 when the printed circuit board 41 is attached to the substrate cover 60. can do.

  Further, the printed circuit board 41 of the termination device 40 is formed with a notch 43, and a protrusion 63 is provided at a position facing the notch 43 in the substrate cover 60, so that the printed circuit board 41 is attached to the substrate cover 60. When attaching, it is possible to prevent an error in the attaching direction.

  Further, since the cord holding part 62 is provided inside the board cover 60, when the printed board 41 is attached to the board cover 60, the wiring cord 42 is attached to the code holding part 62 of the board cover 60, so that wiring is performed by an external force. It is possible to prevent the code 42 from being removed from the printed circuit board 41.

In this embodiment, the printed circuit board 41 has a convex shape, but the printed circuit board 41 is formed between the existing sensor base 50 and the fire sensor 20 fixed thereto with the substrate cover 60 attached. As long as it can be housed and attached in the space of the inlet 54 to be installed and a space for drawing the sensor line 3 from the outside into the existing sensor base 50 can be secured, other shapes and sizes are possible. It's okay.
Further, in the present embodiment, the board cover 60 has a semi-cylindrical shape or a half moon shape, but the printed circuit board 41 can be protected by being attached to the inside, and between the existing sensor base 50 and the fire sensor 20 fixed thereto. Other shapes and sizes are possible as long as the space can be accommodated in the space of the formed inlet 54 and a space for drawing the sensor line 3 from the outside into the existing sensor base 50 can be secured. But you can.
In the present embodiment, the printed circuit board 41 is housed in the substrate cover 60 and protected. However, the printed circuit board 41 may be protected by being fixed with a resin.

  1 Fire Receiver, 3 Sensor Line, 3A Common Line, 3B Line Line, 10 Control Circuit, 11 Constant Voltage Circuit, 12 Receiver Circuit, 13 Discrimination Circuit, 14 Disconnection Circuit, 15 Termination Resistance, 20 Fire Detector, 21 Case body, 22 (case body) surface, 23 (case body) extension, 24 (case body) lid, 25 smoke detection unit, 26 (case body) opening, 27 (case body) Back, 30 Ceiling, 40 Termination device, 41 Printed circuit board, 42 Wiring cord, 43 (Printed circuit board) notch, 44 (Printed circuit board) end, 50 Sensor base, 51 Terminal section, 52 Blade holder, 53 Screw hole (on sensor base), 54 inlet (on sensor base), 60 board cover, 61 (board cover) locking part, 62 (board cover) cord Holder, 63 Protrusion (of substrate cover), 64 Flat surface (of substrate cover), 100 Fire alarm equipment.

Claims (2)

A printed circuit board having a termination resistor;
A wiring cord electrically connected to the printed circuit board,
Attached to the installation surface, and sensor base hole and a gland is formed to draw sensor lines therein, spatial formed between the fire detector which is fixed to the sensing unit basis, It can be stored in the
The wiring cord can be connected to a conductive terminal portion provided on the sensor base and connected to the sensor line ,
The printed circuit board receives an abnormal signal from the fire sensor via the sensor line, and disconnects the terminal resistor and the sensor line when receiving the abnormal signal. apparatus. A printed circuit board having a termination resistor;
One end face is open and the inside is hollow, and the printed circuit board is inserted into the inside from the one end face and attached to the board cover;
A wiring cord electrically connected to the printed circuit board,
Attached to the installation surface, and sensor base hole and a gland is formed to draw sensor lines therein, spatial formed between the fire detector which is fixed to the sensing unit basis, It can be stored in the
The wiring cord can be connected to a conductive terminal portion provided on the sensor base and connected to the sensor line ,
The substrate cover is
A cord holding part that communicates with the outside and has two holes through which the wiring cord passes is provided.
The wiring cord is
After passing through one hole from the inside of the board cover to the outside, the other hole is passed from the outside to the inside of the board cover to be attached to the cord holding portion. A termination device characterized by.

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