JP2012083816A - Detector, and detector mounting and wiring connecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and facilitate work when directly mounting a detector on a ceiling surface without using a mounting adapter such as a detector base and to safely perform the work.SOLUTION: A detector main body 12 of a smoke detector 10 has a disk shape including a vertically penetrating through-hole 14 at a center of the main body. The detector main body 12 includes, on the outer surface, a light-emitting opening 16a and a light receiving opening 18a, the respective openings are covered with transparent covers 20, and scattered light of the light that is emitted from a light-emitting element 16 towards a smoke detecting point P set at an open smoke detecting space located outside the transparent cover 20 is received by a light receiving element 18 to determine a fire. After the smoke detector 10 is mounted and fixed to the ceiling surface, a signal line at the ceiling back side is pulled out from the through-hole 14 to be connected together. A heat detector including a temperature detecting element similarly has the disk shape including the vertically penetrating through-hole 14 at a substantial center of the detector main body 12.

Description

The present invention relates to a detector that is installed in a warning area and detects an abnormality in a monitoring area, and a detector installation and wiring connection method.

  Conventionally, as a detector that is installed in a warning area and detects an abnormality in a monitoring area, for example, there is a fire detector that detects a fire by detecting smoke generated by a fire. The vessel is known. Scattered light type smoke detectors have a smoke chamber through which smoke from the outside flows into the detector, and the smoke chamber is used as a smoke detection space to receive the scattered light of the smoke from the light emitting element by the light receiving element. To detect a fire. In addition, a labyrinth structure that suppresses the incidence of ambient light while allowing outside air (smoke) to be introduced into the smoke detection space in the chamber is also provided.

  In addition, there are a method of using a sensor base as an attachment adapter and a method of directly mounting the sensor without using the sensor base on the installation surface such as the ceiling. The method of using the sensor base is to fix the sensor base at the position of the mounting hole opened in the ceiling, connect the sensor line routed around the back of the ceiling, and connect the sensor body to the fitting on the sensor base By inserting and turning the fitting terminal provided on the connector, it is mechanically and electrically connected.

  The direct mounting method is to pull out the lead wire from the back side of the sensor body, pull out the sensor line from the mounting hole opened in the ceiling without using the sensor base, and connect the lead wire of the sensor body here. For example, the connection is made using a crimp terminal, and the sensor main body is directly fixed to the ceiling surface using a screw or the like while the connected lead wire and sensing line are pushed into the back of the ceiling through the mounting hole.

  Here, for example, in the case of a sensor having a thin structure, it is conceivable to adopt the latter installation method in which the sensor base is not used so as not to impair the advantages and design properties even in the installed state. For example, the latter method can also be applied to a waterproof sensor in which a lead is pulled out from a circuit of a sensor main body and a circuit housing portion is sealed with an epoxy resin or the like.

  FIG. 13 shows an example of installation work when such a conventional sensor base is not used. First, as shown in FIG. 13A, a smoke detector 200 to be attached is prepared. In the smoke detector 200, two lead wires 202a and 202b are drawn from the back side.

  A through hole 206 is formed in the ceiling 204, and the sensor lines 208a, 208b, 210a, 210b routed to the back side of the ceiling through the through hole 206 are taken out. Here, the sensor lines 208a and 208a are signal lines from the upstream side (receiver side), and the sensor lines 210a and 210b are signal lines to the downstream side (termination side).

  Subsequently, as shown in FIG. 13 (B), the lead wire 202a of the sensor 200 and the tips of the sensor lines 208a and 210a are peeled off and the core wires are exposed, and the crimping terminal with an insulating tube is attached thereto. 212a is inserted and crushed by a crimping tool to be connected. Similarly, the ends of the lead wire 202b and the sensor lines 208b and 210b are peeled off and the core wires are exposed, and the core wires are exposed, and a crimp terminal 112b with an insulating tube is inserted into the lead wire 202b. . By sequentially making such a connection from the upstream side to the downstream side of the sensor line drawn from the receiver, a plurality of sensors can be connected to the sensor line. It is possible to detect disconnection of the sensor line by connecting a terminating resistor or terminator on the most downstream side, supplying a predetermined current to the sensor line from normal time, and monitoring this current on the receiver side.

When the connection work between the lead wire and the sensing line is completed, as shown in FIG. 13C, the connected lead wires 202a and 202b and the sensor lines 208a, 208b, 210a and 210b are passed through the through hole 206. It is pushed into the back side of the ceiling, and is fixed by using screws 214 in a state where the sensor 200 is aligned under the through hole 206 (on the sensor side).

JP-A-6-109631 Japanese Patent Laid-Open No. 7-12724 Japanese Patent Laid-Open No. 2001-325684 Japanese Patent No. 4347296

  However, in such a conventional sensor directly attached to the ceiling surface, when the sensor is attached to the ceiling surface, as shown in FIG. While holding the instrument 200 with one hand, first, the complicated work of passing the three core wires of the lead wire 202a and the sensor lines 208a and 210a through the crimp terminal 212a and crushing them with a tool is necessary. There is a problem that it takes time and effort, and since the work is performed at a high place near the ceiling 204, there is a concern about a safety problem.

The present invention provides a detector including a sensor and a detector capable of simply, easily, and safely performing the work when directly mounting on a ceiling surface without using a mounting adapter such as a sensor base. The purpose of this is to provide a method for installing and connecting wires.

(Detector)
The present invention provides a detector,
In the center of the main body, a detector main body provided with a through-hole capable of inserting a sensor line at least temporarily,
A sensor unit provided in the detector body for detecting an abnormality in the monitoring area;
Based on the detection signal output from the sensor unit, an abnormality determination unit that determines whether there is an abnormality,
It is provided with.

  Here, a light shielding member is provided to shield the through hole from the monitoring region side so as not to be visible inside.

The detector of the present invention further comprises:
A lead wire that is pulled out from the detector body and connected to a signal wire installed on the back of the installation surface;
A screw mounting hole for inserting a screw to be fixed to the installation surface of the detector body;
Is provided.

The sensor part
A light emitting opening and a light receiving opening provided on the outer surface of the detector body;
A translucent cover that is attached to the outer surface of the detector body and covers at least the light emitting opening and the light receiving opening;
A light emitting element built in the detector body that emits light through the light emitting opening, near the smoke detection point set in the open smoke detection space located on the external monitoring area side of the translucent cover,
The light received from the light emitting element through the light emitting opening and the light transmitting cover to the vicinity of the smoke detection point is received according to the amount of light received through the light receiving opening and the light transmitting cover. A light receiving element built in the detector body for outputting a signal;
And the abnormality determination unit determines whether or not a fire has occurred based on a light reception signal output from the light receiving element.

  A light-emitting opening and a light-receiving opening are provided on the outer surface of the detector body that is the monitoring area when attached to the installation surface, and the translucent cover is mounted on the detector body so as to cover the light-emitting opening, the light-receiving opening, and the through-hole opening. . A transparent cover is detachably provided on the detector body. The transparent cover portion opposite the through hole opening is colored or an opaque seal is applied.

  The sensor unit is provided with a temperature detection element on the outer surface of the detector body, and the abnormality determination unit determines whether or not a fire has occurred based on the temperature detection signal output from the temperature detection element. A cover is detachably provided in the through hole of the detector body.

(Detector installation and wiring connection method)
The present invention provides a detector installation and wiring connection method.
Leads pulled out from the detector body are provided with through holes on the installation surface, and signal wires drawn from the back of the installation surface to the monitoring area side are inserted into through holes provided in the detector body and fixed to the installation surface. A signal line is connected to the line, and part or all of the connected signal line and lead wire are accommodated in the through hole.

Furthermore, after the connected signal line and lead wire are accommodated in the through hole, the monitoring area side of the through hole is closed by a member that makes the inside invisible from the monitoring area side.

  The sensor of the present invention has a through-hole that allows the sensor line to be inserted at least temporarily in the sensor body. Therefore, when the sensor is attached to the installation surface of the monitoring area, it is installed on the back of the installation surface. The sensor line is pulled out from the ceiling through-hole, and the sensor line pulled out from the lead wire drawn out from the sensor and the insertion hole on the installation surface is inserted into the through hole provided in the sensor body. After fixing the sensor to the installation position on the installation surface with screws, etc., insert the lead wire and the sensor line that are inserted through the through hole and pulled out to the monitoring area side, and insert the core wire into the crimp terminal, for example Then, it can be connected by crimping or by soldering, etc., and then the connection work can be done by returning it to the back side of the installation surface through the through hole. Even if there can be carried out safely.

  Also, since the opening of the through hole is not required after mounting, it is possible to prevent the wiring such as the sensor line from being exposed to the monitoring area side by attaching a covering material covering the opening from the monitoring area side. Since the inside of the opening hole can be hidden from the side, the appearance after mounting is improved.

  In addition, a unit having a predetermined function can be accommodated in the through hole, so that the multi-function of the sensor can be realized.

At this time, the unit having a predetermined function is electrically connected to the sensor or the sensor line, so that power is supplied from the sensor line directly or via a circuit in the sensor, and transmission / reception of signals is performed. It becomes possible to do.

Explanatory drawing which showed the embodiment of the smoke detector by this invention in the cross section and the plane seen from the lower side The perspective view which showed the smoke detector in the embodiment of FIG. FIG. 1 is a block diagram showing a detector circuit built in the smoke detector of FIG. Explanatory drawing which showed the installation operation | work with respect to the ceiling hole of the smoke detector by this invention in order. Explanatory drawing which showed the mode of the attachment work with respect to the ceiling attachment hole of the smoke detector by this invention Explanatory drawing which showed the state which fixed the smoke detector by this invention to the ceiling mounting hole Explanatory drawing which showed other embodiment of the smoke detector by this invention which stuck the seal | sticker on the transparent cover and hidden the through-hole Explanatory drawing showing the installation state of the smoke detector according to the present invention in which the terminal resistor is accommodated in the through hole Explanatory drawing which showed other embodiment of the smoke detector by this invention which made the through hole the rectangular hole. Explanatory drawing which showed other embodiment of the smoke detector by this invention which has arrange | positioned the light emission opening and the light reception opening in the wall surface of a donut hole The explanatory view which showed the embodiment of the heat sensor by the present invention in the section seen from the section and the lower side The block diagram which showed the sensor circuit incorporated in the heat sensor of FIG. Explanatory drawing which showed installation work to ceiling installation hole of conventional waterproof smoke detector in order

  FIG. 1 is an explanatory view showing an example of the structure of a smoke detector according to the present invention. FIG. 1 (A) shows a cross-sectional view, and FIG. 1 (B) shows a plan view seen from below. Note that the present invention is not limited to the embodiments.

  In FIG. 1, the smoke detector 10 of this embodiment schematically includes a detector body 12, a light emitting element 16, a light receiving element 18, a transparent cover 20, a back cover 24, and a circuit board 26. Since the detection space is set outside the smoke detector 10, the smoke detector 10 is not provided with a conventional chamber or labyrinth, so that it is formed thin as a whole.

  The sensor body 12 has a cylindrical donut (annular) shape having a through hole 14 having a substantially central portion opened in the vertical direction in the figure. A flat transparent cover 20 is attached to a surface (referred to as a detection surface 12a) on the monitoring area side (lower side in the figure) of the sensor body 12 in the installed state, and the monitoring area side including the opening of the through hole 14 is illustrated. It covers as a whole.

  The plate-like body 12a is detachable from the sensor main body 12. After the sensor main body 12 is attached and fixed to an installation surface such as a ceiling, the transparent cover 20 is removed from the sensor main body 12 and penetrated. The wiring member can be pulled out to the indoor side through the hole 14 and the wiring connection work can be performed, so that the installation and wiring work of the smoke detector can be made simple, easy and safe. After the wiring connection work is completed in this way, a translucent transparent cover 20 is attached to the sensor body 12.

  A transparent cover in which a housing hole in which the light emitting element 16 is disposed and a housing hole in which the light receiving element 18 is disposed are formed in the sensor body 12, and the optical axes of the light emitting element 16 and the light receiving element 18 are formed of a translucent material. 20 is arranged so as to intersect at a smoke detection point P set in the smoke detection space of the external monitoring area, thereby emitting light from the light emitting element 16 to the external smoke detection space of the sensor main body 12. The scattered light type smoke detection structure is realized in which the component (scattered light) scattered by the smoke present in the smoke detection space is received by the light receiving element 18 to detect smoke.

  That is, a light emitting opening 16a and a light receiving opening 18a are formed on the detection surface 12a of the sensor body 12 corresponding to the receiving holes of the light emitting element 16 and the light receiving element 18, and light from the light emitting element 16 is transmitted through the light emitting opening 16a. Light scattered according to the amount of light received and scattered by entering the light receiving element 18 through the light receiving opening 18a after the scattered light emitted from the smoke detecting point P and the smoke detecting space in the vicinity thereof and scattered by the smoke particles existing in the smoke detecting space. A signal is output. Thus, by setting the smoke detection point P of the scattered light type smoke detection mechanism outside the sensor main body 12, it is not necessary to form a smoke detection space inside as in the conventional scattered light type smoke sensor.

  A translucent transparent cover 20 is disposed on the detection surface 12a provided with the light emitting opening 16a and the light receiving opening 18a of the sensor body 12, and the light emitting opening 16a and the light receiving opening 18a are closed so that dust does not enter inside. I have to. The transparent cover 20 is detachably attached to the sensor main body 12, and a boss 21 protrudes inside the outer peripheral portion, and is fitted into a boss hole formed on the outer peripheral surface of the sensor main body 12 to prevent the transparent cover 20 from coming off. . Note that the transparent cover 20 does not necessarily need to be visually transparent, and may have a light-transmitting property that transmits light from the light-emitting element 16 and scattered light with a predetermined transmittance or higher.

  If a boss hole is provided on the sensor body 12 side corresponding to the boss 21 of the transparent cover 20, positioning is required when the transparent cover 20 is mounted. Instead, by forming an annular groove along the outer peripheral side surface of the sensor body 12, alignment can be made unnecessary.

  In this embodiment, the transparent cover 20 is provided so as to cover the entire detection surface 12a. However, the transparent cover may be fitted only in the light emitting opening 16a and the light receiving opening 18a.

  Inside the sensor body 12 is formed a circuit housing portion 22 that is open on the back side (installation surface side). A circuit board 26 is incorporated in the circuit board 26, and the circuit board 26 is based on scattered light type smoke detection. A sensor circuit that detects fire and outputs an alarm signal to the receiver according to the determination result is installed. A lead wire 28 is drawn out from the circuit board 26, and a back cover 24 that closes the circuit housing portion 22 is attached to the back surface of the circuit housing portion 26.

  As shown in FIG. 1 (B), recessed portions 32 are formed at two locations near the outer periphery of the detection surface of the sensor body 12, and screw mounting holes 34 are provided there, and screws are inserted into the screw mounting holes 34 so that the ceiling. The smoke detector 10 can be directly attached and fixed to the equal installation surface.

  FIG. 2 is a perspective view of the smoke detector shown in FIG. 1, with the detection surface side, that is, the monitoring region side in the installed state facing up.

  An alarm indicator lamp 36 is provided on the outer peripheral portion of the detector body 12 on the detection surface 12a side. The warning indicator lamp 36 may have a flat structure embedded in the detection surface 12a, and the transparent cover 20 may be attached to the outside thereof, or the transparent cover is provided with an insertion hole, and the transparent cover is attached. It may be further projected outside in the state.

  FIG. 3 is a block diagram showing a main part of a detector circuit built in the smoke detector of FIG. In FIG. 3, the detector circuit of the smoke detector 10 includes a signal processing unit 38 using a microprocessor (MPU) known as a one-chip CPU. The signal processing unit 38 includes a storage unit 40 and a light emission control unit. 42, an amplifier circuit 44, and a notification circuit 46, and a fire determination unit 48 is provided in the signal processing unit 38 as a function realized by executing a program. The power necessary for the operation of each unit is supplied from the sensor line via the L and C terminals (not shown).

  In response to an instruction from the signal processing unit 38, the light emission control unit 42 intermittently drives the light emitting element 16 using, for example, an infrared LED to emit light at a predetermined cycle, and emits the light into the smoke detection space of the monitoring area. The amplification circuit 44 receives and amplifies the received light signal of the scattered light from the smoke present in the smoke detection space from the photodiode, and outputs the amplified signal to the signal processing unit 38.

  The light emission control will be described in more detail. The light emission drive of the light emitting element 16 is performed by continuously outputting, for example, five 3 kHz light emission pulses from the light emission control unit 42 that has received a light emission pulse signal with a 1 second period from the signal processing unit. Done. That is, the light emission 5 times by the light emission pulse of 3 kHz is repeated every second.

  The light reception signal corresponding to the intensity of the scattered light received by the light receiving element 18 is amplified by the amplifier circuit 44, and this amplified signal is AD synchronized with the output of the light emission drive pulse signal from the light emission control unit 42 by the signal processing unit 38. For example, the fire determination unit 48 determines that a fire has occurred when the amount of scattered light received in the light reception data exceeds a predetermined fire threshold, and sends a fire detection signal to the alarm circuit 46. Output.

  When receiving the fire detection signal from the fire determination unit 48 of the signal processing unit 38, the alarm circuit 46 turns on the built-in switching element and senses it through the lead wire 28 drawn out from the terminals L and C to the outside. The alarm signal is sent to the receiver by sending the alarm current to the receiver line.

  In addition, the fire determination by the fire determination unit 48 can use an appropriate fire determination such as making a determination based on the rate of increase in the amount of received light per unit time, in addition to the comparison of the amount of scattered light received and the fire threshold. For example, a fire may be determined when the rate of increase in the amount of received light per unit time exceeds a predetermined rate.

  FIG. 4 is an explanatory view showing in sequence the installation and wiring (connection to the sensor line) work of the smoke detector according to the present invention, and FIG. 5 shows the state during the work of the smoke detector. 6 shows a state after the smoke detector operation is completed. That is, FIGS. 4 to 6 show an embodiment of a method of installing a detector and a wiring connection method including a sensor according to the present invention.

  The procedure of the mounting operation will be described with reference to FIG. First, as shown in FIG. 4A, a ceiling mounting hole (insertion hole) 52 is formed in advance at a predetermined position of the ceiling 50 in the warning area (monitoring area). When the smoke detector 10 is attached to the lower side of the ceiling mounting hole 52 in the figure, the sensor lines 56a and 56b and the sensor lines 58a and 58b routed to the back side (upper side in the figure) of the ceiling 50 are connected to the ceiling mounting hole 52. To the lower working space in the figure.

  Here, the sensor lines 56a and 56b are sensor lines from the upstream smoke sensor located adjacent to the receiver or the receiver side, while the sensor lines 58a and 58b are the other lines located downstream. This is a sensor line for a smoke sensor. When the smoke sensor 10 is connected to the end of the sensor line, only the sensor lines 56a and 56b from the receiver side are pulled out from the ceiling mounting hole 52.

  Next, as shown in FIG. 4B, the sensor lines 56a and 56b and the sensor lines 58a and 58b drawn from the ceiling mounting hole 52, and the lead wire 28 drawn to the back side of the smoke detector 10, In a state where the smoke detector 10 is inserted into the through hole 14 of the smoke detector 10, the smoke detector 10 is fixedly installed below the ceiling mounting hole 52 with a screw 54.

  The details of FIG. 4B are shown in FIG. In FIG. 5, the sensor lines 56 a and 56 b and the sensor lines 58 a and 58 b drawn from the back of the ceiling through the ceiling mounting hole 52 are inserted into the through hole 14 of the smoke detector 10, and the circuit board 26 is used. Similarly, lead wires 28 (28a, 28b) taken out from the back side of the smoke detector 10 are also inserted into the through holes 14.

  Thus, after the lead wire 28 and the sensor line 56a, the sensor lines 56b, 58a, and 58b are passed through the through hole 14 of the smoke sensor 10, the smoke sensor 10 is aligned to the lower side of the ceiling mounting hole 52. In this state, the smoke detector 10 is directly attached and fixed to the ceiling 50 by the screw 54 through the screw attachment hole 34 formed in the recessed portion 32.

  Subsequently, as shown in FIG. 4C, the lead wires 28a and 28b drawn to the monitoring area side through the through hole 14 of the smoke detector 10 are connected to the sensor lines 56a and 56b and the sensor lines 58a and 58b. Do work. For example, the connecting operation is performed by inserting the lead wire 28a, the sensor line 56a, and the sensor line 58a with the core wires inserted into the crimp terminals (sleeves) 60a with a transparent insulating tube. Crimp connection by crushing using. Similarly, the lead wire 28b, the sensor line 56b, and the sensor line 58b, each of which has its end covered, are crimped and connected by being inserted into another crimp terminal 60b with an insulating tube and crushed by a tool. Not only such crimp connection but also any connection method can be adopted, for example, an insulation treatment is performed after the connection by soldering.

  The operation of connecting the three signal lines together with the crimp terminal is performed after the smoke detector 10 has already been installed and fixed to the ceiling 50, and the conventional operation of connecting the smoke detector shown in FIG. Thus, it is not necessary to perform complicated work such as connecting and fixing the signal lines with the crimp terminals while supporting the smoke detector 200 by hand, and the operator does not hold or support the smoke detector 10 by hand. Connection work can be performed easily.

  In particular, the signal line connection work is a high place work close to the ceiling 50, but since the smoke detector 10 has already been mounted and fixed, it is only necessary to connect the wires together. And can be performed safely even at high places.

  Subsequently, as shown in FIG. 4D, the lead wires 28a and 28b, the sensor lines 56a and 56b, and the sensor lines 58a and 58b connected by using the crimp terminals 60a and 60b are connected from the through hole 14 to the ceiling mounting hole. The work is completed by pushing the back side of the ceiling 50 through 52.

  The details of the work completion state shown in FIG. 4D are shown in FIG. When the mounting work and the wiring connection work for the ceiling mounting hole 52 are completed in this way, the transparent cover 20 removed from the smoke detector 10 prior to the mounting work is mounted as shown in FIGS. 4 (D) and 6. By doing so, it is possible to prevent the wiring material from protruding to the monitoring area side.

  In FIG. 6, the connected lead wires 28a and 28b, the sensor lines 56a and 56b, and the sensor lines 58a and 58b are pushed into the back side of the ceiling, but the lead wires 28a and 28b and the sensor line are inserted. It is desirable that part or all of the connecting portions of 56a and 56b and the sensor lines 58a and 58b be accommodated in the through hole 14. By storing the signal line connection part in the through hole 14 in this way, the connection part can be protected from adhesion of foreign matter such as dust and moisture on the back side of the ceiling, and confirmation of the connection part. Can also be easily done.

  FIG. 7 is an explanatory view showing another embodiment of the smoke detector according to the present invention in which a transparent cover is pasted with a seal that does not transmit visible light and the through hole is hidden. FIG. 7 (B) shows a plane viewed from the lower side.

  The basic structure of the smoke detector 10 in FIG. 7 is the same as that of the embodiment of FIG. 1, but an opaque seal 62 is attached to the outer position opposite to the through hole 14 of the transparent cover 20 and viewed from the monitoring region side in the attached state. The state of the wiring accommodated on the back side of the ceiling via the through hole 14 is not visible from the outside.

  Accordingly, for example, the state of the lead wire 28 and the sensor line pushed into the back side of the ceiling 50 as shown in FIG. 6 is hidden from the monitoring region side by covering the opening of the through hole 14 with the opaque seal 62. The inside can be made invisible, and the appearance when the smoke detector 10 is installed can be improved.

  Here, as the opaque seal 62, the same color as that of the sensor body 12 may be used, or for example, a color different from that of the sensor body 12 may be used in order to give a design accent.

  In the embodiment of FIG. 7, the opaque seal 62 is affixed to the transparent cover 20, but it may be colored by painting at a position facing the through hole 14 of the transparent cover 20.

  The coloring by the opaque seal 62 or the coating substantially covers the through hole 14 so that the inside of the penetrating light is almost invisible, and does not hinder the emission of infrared light from the light emitting opening 16a and the incidence of scattered light to the light receiving opening 18a. In this range, any other material and method can be used.

  FIG. 8 is an explanatory view showing a ceiling surface installation state of the smoke detector shown in the embodiment of FIG. 7, and shows the smoke detector installed at the end of the sensor line.

  In FIG. 8, the smoke detector 10 has a transparent cover 20 attached to the lower surface of the detector body 12 as shown in FIG. The inside of the hole 14 is made invisible from the monitoring area side.

  The lead wires 28a and 28b drawn to the back surface side of the sensor body 12 are connected to the sensor lines 55a and 55b serving as termination positions, and at the same time, the lead terminals 66a and 66b of the termination resistor 64 and the crimp terminals 60a and 66b, respectively. The connection is fixed using 60b. The termination resistor 64 connected by the lead wires 66a and 66b is accommodated in the through hole 14 of the smoke detector 10 after the connection work is completed.

  By storing the terminating resistor 64 in the through hole 14 of the smoke detector 10 in this manner, the resistance performance is stabilized by reducing adhesion of dust and moisture compared to the case where it is arranged on the back side of the ceiling. it can. In addition, for example, when a sensor is added, it is necessary to confirm the sensor (terminal position of the line) arranged at the end. In this embodiment, the transparent cover 20 is removed and the through hole 14 is removed. If the termination resistor 64 is accommodated, it can be easily confirmed that it is a termination sensor.

  FIG. 9 is an explanatory view showing another embodiment of the smoke detector according to the present invention in which the through hole is a rectangular hole. FIG. 9 (A) shows a cross section, and FIG. 9 (B) shows the installation state. The plane seen from the monitoring area side is shown.

  9, the basic structure of the smoke detector 10 is the same as that of the embodiment of FIG. 1, but as a through hole provided substantially at the center of the detector body 12, in this embodiment, a rectangular shape in plan view. A rectangular through hole 70 is formed.

  In FIG. 9, the case where a rectangular through hole 70 having a rectangular shape is formed is taken as an example. However, an appropriate polygonal through hole other than a rectangular shape or a through shape having a special shape such as a star shape is used. An arbitrary shape such as a hole can be used.

  10 is an explanatory view showing another embodiment of the smoke detector according to the present invention, FIG. 10 (A) shows a cross section, and FIG. 10 (B) shows a plane seen from the lower side. The smoke detector of this embodiment is different from the above embodiment in that a light emitting opening and a light receiving opening are arranged on the peripheral wall surface of the through hole.

  In FIG. 10A, the smoke detector 10 is composed of a detector body 12, a light emitting element 16, a light receiving element 18, a transparent cover 20, a back cover 24, a circuit board 26, and a lead wire 28. Although the same as the configuration, a storage hole in which the light emitting element 16 is accommodated is opened as a light emitting opening 16a in the peripheral wall of the through hole 14, and a corresponding hole in which the light receiving element 18 is accommodated correspondingly is opened. A light emitting opening 18a is formed on the wall surface.

  Thus, by forming the light emitting opening 16a and the light receiving opening 18a on the peripheral wall surface of the through hole 14, the smoke detection point P where the optical axis of the light emitting element 16 and the optical axis of the light receiving element 18 intersect is the lower side of FIG. Therefore, an external smoke detection space that is slightly moved to the installation surface side as compared with the case where the detection surface 11a is provided is configured. In the case where the light emitting opening 16a and the light receiving opening 18a are formed in this way, it is possible to suppress the influence of disturbance light compared to the case where the light emitting opening 16a and the light receiving opening 18a are opened on the detection surface.

  1, 9, and 10, the entire transparent surface including the opening of the through hole 14 is covered by mounting the integral transparent cover 20, but for example, the through hole of the transparent cover It is also possible to open a part corresponding to the above by hollowing out or the like, and a separate lid-like member may be detachably provided in this part. At this time, the inside of the through hole can be made invisible from the monitoring region side by forming the lid-like member with a material that does not transmit visible light or by applying a coating that does not transmit visible light. Further, it is possible to further improve the appearance by devising the color of the lid-like member.

  FIG. 11 is an explanatory view showing an example of the structure of the heat sensor according to the present invention. FIG. 11A shows a cross-sectional view, and FIG. 11B shows a plan view seen from below. Note that the present invention is not limited to the embodiments.

  In FIG. 11, the heat sensor 100 of the present embodiment is roughly composed of a sensor body 112, a temperature detection element 116, a protective cover (detection element protective cover) 118, a cover 120, a back cover 124, and a circuit board 126. It is configured.

  The sensor body 112 has an annular shape similar to the smoke sensor 10 of FIG. 1, and a through hole 114 that allows a sensor line and a lead wire 128 to be inserted through substantially the center of the sensor body 112 in the vertical direction in the figure. Is formed. As shown in FIG. 4, the through hole 114 is simple, easy, and safe for mounting the heat sensor 100 by using the heat sensor 100 in the ceiling mounting hole and using it for wiring connection work. Can be. A cover 120 detachably attached to the sensor main body 112 is attached to the opening of the through hole 114 on the monitoring region side. The cover 120 is formed of, for example, a material that does not transmit visible light. The inside of the through hole 114 is made invisible.

  The sensor body 12 is provided with a temperature detection element 116 projecting downward (monitoring area), and a protective cover 118 having a frame structure covering the periphery and allowing the passage of the hot air current. The temperature detection element 116 is a thermistor, a semiconductor element, or the like, and outputs a temperature detection signal corresponding to the temperature when receiving a hot air current due to a fire.

  A circuit housing part 122 that is open to the back side is formed in the interior of the sensor body 112 and a circuit board 126 is built in. The circuit board 126 is used to determine a fire based on a temperature detection signal from the temperature detection element 116. A sensor circuit is implemented. A lead wire 128 is drawn out from the circuit board 126, and the circuit storage portion 126 is closed with a back cover 124. The other structure is basically the same as the smoke detector 10 of FIG.

  FIG. 12 is a block diagram showing a sensor circuit built in the thermal sensor of FIG. In FIG. 12, the sensor circuit of the heat sensor 100 includes a signal processing unit 138 using a microprocessor (MPU) known as a one-chip CPU, and the signal processing unit 138 includes a storage unit 140 and a temperature detection circuit. 142 and the alarm circuit 146 are provided, and the signal processing unit 138 is provided with a fire determination unit 148 as a function realized by execution of the program. Each unit operates by receiving power supply from a sensor line, similarly to the smoke sensor 10 of FIG.

  The temperature detection circuit 142 generates a temperature detection signal from a resistance change or a voltage change corresponding to the temperature of the temperature detection element 116 and outputs the temperature detection signal to the signal processing unit 138. The fire determination unit 148 AD-converts the temperature detection signal and reads it as temperature detection data, and outputs a fire detection signal to the alarm circuit 46 when the temperature detection data exceeds a predetermined fire threshold, for example.

  Upon receiving a fire detection signal from the fire determination unit 148 of the signal processing unit 138, the alarm circuit 146 turns on the built-in switching element and detects the sensor via the lead wire 128 drawn out from the terminals L and C to the outside. By sending a notification current to the line, a notification signal is transmitted to the receiver side. Here, the fire determination by the fire determination unit 148 can use an appropriate fire determination such as determining a fire from the increase rate of the detected temperature per unit time, in addition to the comparison of the temperature detection data and the fire threshold.

  In the smoke detector 10 of the above embodiment, as shown in FIG. 1 (B), the light emitting opening 16a and the light receiving opening 18a are arranged at the center of the outer diameter circle of the sensor main body 12 in a plan view. Although they are arranged at positions facing each other through, they may be arranged so as to be offset by a predetermined angle even in a plan view instead of being located at the facing positions. That is, the line connecting the light emitting opening and the center of the sensor body outer diameter and the line connecting the light receiving opening and the center of the sensor body outer diameter in a plan view may be arranged to have a predetermined angle other than 180 degrees.

  In the heat sensor shown in FIG. 11, the temperature detecting element 116 protrudes downward from the lower surface of the sensor main body 112. However, any other position can be used as long as it is in a position to receive a thermal airflow due to a fire. The temperature detecting element 117 can be provided at the position.

  Further, as another embodiment of the present invention, the smoke detector 10 shown in FIG. 1 includes a temperature detection element 116 and a protective cover 118 provided in the heat detector 100 of FIG. By providing it in a position that does not obstruct the space, it may be a combined sensor that detects smoke and heat to determine a fire. In this case, of course, the protective cover 118 and the transparent cover 20 may be integrally formed, thereby reducing the number of parts, leading to simplification of assembly and cost reduction.

  In each of the embodiments described above, the outer shape of the sensor in plan view is a circle, but may be any other outer shape. The through hole is not necessarily provided at the center of these external shapes, and may be provided at a position offset from the center.

  In each of the above embodiments, the lead wire from the circuit board is drawn out from the back side (installation side) of the sensor, but may be drawn out from the side surface around the through hole to the inside of the through hole. If it does in this way, the opening size of the through-hole provided in an installation surface can be made smaller.

  The present invention is not limited to fire detectors (fire fighting standard products) of fire detectors, but can be similarly applied to fire detectors other than fire fighting standard products and various detectors that detect abnormalities other than fire.

The present invention is not limited to the above-described embodiment, includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above-described embodiment.

10: Smoke detector 12, 112: Sensor main body 14, 114: Through hole 16: Light emitting element 16a: Light emitting opening 18: Light receiving element 18a: Light receiving opening 20: Transparent cover 22, 122: Circuit housing part 24, 124: Back Lids 26, 126: Circuit boards 28, 128: Lead wires 32, 132: Recesses 34, 134: Screw mounting holes 36, 136: Notification indicator lamps 38, 138: Signal processing unit 40, 140: Storage unit 42: Light emission Control unit 44: Amplifier circuit 46: Alarm circuit 48: Fire judgment unit 50: Ceiling 52: Wire hole 54: Screws 56a, 56b, 58a, 58b: Sensor lines 60a, 60b: Crimp terminal 62: Opaque seal 70: Rectangular through hole 116: temperature detection element 142: temperature detection circuit

Claims (11)

In the center of the main body, a detector main body provided with a through-hole capable of inserting a sensor line at least temporarily,
A sensor unit provided in the detector body for detecting an abnormality in the monitoring region;
Based on the detection signal output from the sensor unit, an abnormality determination unit that determines whether there is an abnormality,
A detector comprising:
The detector according to claim 1, further comprising a light shielding member that shields the through hole from the monitoring region side so as not to be visually recognized.
The detector of claim 1, further comprising:
A lead wire that is pulled out from the detector body and connected to a signal wire laid on the back of the installation surface;
A screw mounting hole for inserting a screw to be fixed to the installation surface of the detector body;
The detector characterized by providing.
The detector according to claim 1, wherein the sensor unit includes:
A light emitting opening and a light receiving opening provided on the outer surface of the detector body;
A translucent cover attached to the outer surface of the detector body and covering at least the light emitting opening and the light receiving opening;
A light-emitting element built in the detector body that emits light through the light-emitting opening to the vicinity of a smoke detection point set in an open smoke detection space located on the external monitoring area side of the translucent cover When,
Light received from the light emitting element through the light emitting opening and the translucent cover, and scattered light due to smoke emitted to the vicinity of the smoke detection point is received through the light receiving opening and the translucent cover. A light receiving element built in the detector body for outputting a light receiving signal according to the amount;
And the abnormality determination unit determines whether or not a fire has occurred based on a light reception signal output from the light receiving element.
The detector of claim 3, wherein
The light emitting opening and the light receiving opening are provided on the outer surface of the detector main body which is on the monitoring region side in a mounting state on the installation surface,
The light-transmitting cover is attached to a detector main body so as to cover the light emitting opening, the light receiving opening, and the through hole opening.
6. The detector according to claim 5, wherein the transparent cover is detachably provided to the detector main body.
7. The detector according to claim 6, wherein a portion of the transparent cover facing the through hole opening is colored or an opaque seal is attached.
The detector of claim 1, wherein
The sensor unit is provided with a temperature detection element on the outer surface of the detector body,
The abnormality determination unit determines whether or not a fire has occurred based on a temperature detection signal output from the temperature detection element.
9. The detector according to claim 8, wherein the cover is detachably provided in the through hole of the detector main body.
Leads pulled out from the detector body are provided with through holes on the installation surface, and signal wires drawn from the back of the installation surface to the monitoring area side are inserted into through holes provided in the detector body and fixed to the installation surface. A detector installation and wiring connection method, wherein a signal line is connected to a line, and part or all of the connected signal line and lead wire are accommodated in the through hole.
  11. The detector installation and wiring connection method according to claim 10, wherein the connected signal line and lead wire are accommodated in the through hole, and the monitoring area side of the through hole is monitored. A detector installation and wiring connection method, wherein the interior is closed from a region side by a member which makes the inside invisible.

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