JP4499546B2 - Fire detector - Google Patents

Description

  The present invention relates to an improvement in a fire detector that facilitates the mounting of a substrate block to a detector body and is also provided with security measures.

  2. Description of the Related Art Conventionally, fire detectors in which a substrate block having a detection control unit is built in a detector body have been widely used.

  This is proposed in Patent Document 1 and the like, but as shown in FIG. 8, the sensor body 100 and the protector unit 200 are molded separately, and a substrate block provided with a heat detection element 440. By engaging 400 with the engagement claw 200a of the protector unit 200 from below in the fitting hole 100a of the sensor body 100 in a state in which the sensor 400 is installed in the sensor body 100. The protector unit 200 is attached to the sensor body 100, and the heat detection element 440 provided on the substrate block 400 is built in the protector unit 200.

Here, the board block 400 is attached to the sensor body 100 by placing the board block 400 on the board block mounting support seat 130 in which the screw holes are formed and inserting the screws R through the mounting holes 410 of the board block 400. The board block mounting support seat 130 is screwed and fixed.
Japanese Patent Application No. 2003-301075

  However, according to such a structure, when assembling the fire detector, it is necessary to perform the work of screwing the board block one by one, which is troublesome. Furthermore, there is a possibility that the substrate block may be shocked or damaged when screwed, and the sealing performance of the substrate may not be maintained.

  Furthermore, since it is a structure that is fixed and secured by screwing, there is a possibility that a substrate block is removed and an eavesdropper, a surveillance camera, or the like is loaded.

  The present invention has been proposed to solve such problems, and it is an object of the present invention to provide a fire sensor in which a substrate block can be easily attached to a sensor body, but it is difficult to remove the substrate block after the attachment. To do.

In order to achieve the above object, in claim 1 of the present invention, in the fire detector in which the substrate block constituting the detection control unit is built in the sensor body, the substrate block forms an attachment hole, The sensor body is provided with a substrate block mounting support seat formed with a small protrusion having an outer diameter smaller than the inner diameter of the mounting hole, and the substrate block is mounted and accommodated in the sensor body. together is placed on the shielding plate are, so as to project the small projection from the mounting hole portion, in a state of being placed on the substrate block mounting support seat, the small projections protruding from the mounting hole tip part of it is thermally melted, is secured to the substrate block mounting support seat, further the substrate block is concealed by the substrate block is placed on at least the shielding plate There no part is covered with a waterproof protective layer, the mounting hole portion is formed in the mounting piece formed to protrude from the substrate block, attachment piece has a structure that is exposed from the waterproof protective layer.

  Here, the fire sensor of the present invention can be applied to a heat sensor, a smoke sensor, and a combined smoke heat sensor.

  According to the first aspect of the present invention, the board block can be attached by simply melting the small protrusions of the board block mounting support seat using a soldering iron or the like, and the board block mounting support seat or the board block can be removed. You can't do it unless you destroy it. For this reason, it is possible to prevent the substrate block from being illegally replaced while being easy to mount.

Further, in claim 1, since the substrate block is covered with a waterproof protective layer, the fire detection operation is performed even if some water enters the sensor body by receiving water from the sprinkler at the time of fire notification. It will not be impossible.

  Embodiments of the present invention will be described below.

  FIG. 2 is an exploded perspective view showing an example of the fire detector of the present invention.

  Reference numeral 1 denotes a sensor body, 2 denotes a protector section, 3 denotes a shielding plate, and 4 denotes a substrate block.

  The sensor body 1 and the protector part 2 are integrally molded to form a main body A.

  The main body A has a communication opening 10 formed by integrally molding the body 1 and the protector 2, and the communication opening 10 is blocked by the shielding plate 3.

  In addition, the sensor body 1 has terminal dimensions of the terminal connection support portions 11 and 11 and an outer dimension smaller than the inner diameter dimension of the mounting hole of the substrate block 4 at the tip in order to house the substrate block 4 therein. Substrate block mounting support seats 13 and 13 having small protrusions 13a are provided.

  The shielding plate 3 is provided with a flange 31 on the bottom surface 30, and the flange 31 is provided with a peripheral wall 32 in which a heat detection element insertion hole 33 is formed at the center.

  The insertion hole 33 is provided with an invitation inclined portion 33a that is inclined from the outer periphery of the insertion hole 33 toward the hole in order to eliminate the catch when the heat detection element 44 is inserted when the substrate block 4 is installed in the sensor body 1. Forming.

  The substrate block 4 has a structure in which a circuit board on which electronic components are mounted is covered with a waterproof protective layer 40.

  In the substrate block 4, mounting pieces 41 having mounting holes 41a and terminal portions 42 and 42 are provided at four corners, and a heat detection element 44 formed of a thermistor or the like is provided on the lower surface. The mounting pieces 41, 41 having the portion 41 a, the terminal portions 42, 42 and the heat detection element 44 have a structure exposed from the waterproof protective layer 40.

  According to such a structure, the heat detecting element 44 protruding from the lower surface of the substrate block 4 is protruded into the protector portion 2 from the insertion hole 33 formed in the center of the flange portion 31 of the shielding plate 3. The flange 31 of the shielding plate 3 is fitted into the recess 12 formed around the communication opening 10 of the sensor body 1, the substrate block 4 is placed on the peripheral wall 32 of the shielding plate 3, and the substrate block 4 The mounting hole 41a is mounted on the board block mounting support seats 13 and 13 and fixed inside the sensor body 1 (see FIGS. 3A, 3B, and 3C).

  That is, the substrate block 4 is in a state in which the mounting hole 41a is placed on the substrate block mounting support seats 13 and 13 and the small protrusions 13a of the substrate block mounting support seats 13 and 13 are projected from the mounting hole 14a. The small projections 13a are attached to the sensor body 1 by heat melting, which will be described later.

  In addition, when used as a fire detector, a base portion attached to the ceiling surface is coupled to the upper part of the detector body A, and is used by being attached to the ceiling surface. By rotating the sensor body in a certain direction with respect to the base portion (not shown) fixed to the base plate, the blade blade connection terminal 5 in the sensor body 1 and the blade connection terminal provided in the base portion (Not shown) are fitted together, and the sensor main body and the base portion are coupled.

  In the example shown in the drawing, the mounting hole 41a is formed in the mounting piece 41 formed at the corner end of the circuit board, and the mounting hole is configured at a location exposed from the waterproof protective layer 40 described later. Without providing such attachment pieces, a hole penetrating the waterproof protective layer 40 may be formed as the attachment hole portion.

  FIG. 3 is a view showing an example of a state in which the shielding plate 3 and the substrate block 4 are assembled to the sensor body 1, FIG. 3A is a plan view when viewed from above, and FIG. FIG. 3C is a longitudinal sectional view when viewed from the side, and FIG. 3C is a plan view when viewed from below.

  When the shielding plate 3 and the substrate block 4 are assembled to the bottom surface of the sensor body 1, the flange portion 31 of the shielding plate 3 is fitted into the recess 12 of the insertion opening 10 so that the flange portion 31 of the shielding plate 3 is inserted. However, the upper surface of the insertion opening 10 is closed except for the insertion hole 33.

  The substrate block 4 placed on the peripheral wall 32 of the shielding plate 3 can be placed in close contact with the upper edge of the peripheral wall 32 because the peripheral wall 32 is formed at a uniform height.

  Therefore, even if outside air enters the inside of the sensor body 1 from the ceiling surface or the like by the flange portion 31 of the shielding plate 3, the flow path of the air flowing from the inside of the sensor body 1 to the protector portion 2 is blocked. It is possible to prevent the heat detection element 44 installed in the protector unit 2 from entering the unit 2 and carelessly cooling it to hinder the detection of the environmental temperature.

  Next, a procedure for attaching the substrate block 4 to the sensor body 1 will be described. 1A and 1B show the mounting procedure of a substrate block in the fire detector of the present invention, wherein FIG. 1A shows a state before mounting the substrate block, and FIG. 1B shows a state after mounting the substrate block.

  The board block 4 places the mounting piece 41 on the mounting support seat 13 erected in the sensor body 1, and the small protrusion 13 a of the support seat 13 protrudes from the mounting hole 41 a of the mounting piece 41 of the board block 4. The tip is melted and fixed by pressing the iron 7 against the tip of the small protrusion 13a.

  When the substrate block 4 is fixed in the sensor body 1 by such a method, the heating temperature of the iron 7 is set lower than the melting point of the mounting piece 41 of the substrate block 4 in order not to change the shape of the substrate block 4 and If the sensor body A is molded with ABS resin and the circuit board of the substrate block 4 is made of glass epoxy resin, the temperature of the iron 7 during heat deposition is set higher than the melting point of the small protrusion 13a. Is preferably 220 to 230 ° C.

  Further, in the illustrated fire detector, the detector body 1 and the protector portion 2 are integrally formed of ABS resin, so that the mounting support seat 13 provided with the small protrusions 13a is made of the same material. Only the small protrusion 13a may be formed of a material that is easily melted and deformed by heating.

  In the present invention, since the structure is fixed by such heat melting, screws are unnecessary, the number of parts is reduced, and the substrate block 4 is attached to the sensor body unless the substrate block 4 and the mounting support seat 13 are broken. It cannot be removed from 1. Therefore, there is little possibility that the substrate block 4 is removed and the others are replaced and used illegally.

  Next, the wiring connection structure of the substrate block 4 will be described.

As shown in FIG. 2, the sensor body unit 1 performs wiring work in a state where the terminal portions 42 and 42 of the substrate block 4 are placed in addition to the substrate block mounting support seats 13 and 13 described above. A pair of connection support seats 11 are provided.
The connection support seats 11 and 11 are diagonally arranged on the side opposite to the board block mounting support seats 13 and 13.

  FIG. 4 is a partial schematic explanatory view showing a state in which the substrate block is placed on the connection support seat, and FIG. 5 shows a state in which the substrate block placed on the connection support seat is connected to the connection terminal in the sensor body. ing.

  As shown in the figure, the connection support seat 11 has a support portion 11a formed by notching a part above the leg portion protruding from the bottom surface of the sensor body 1, on which a substrate block is formed. 4 is connected to the plug blade receiving connection terminal 5 in a connection hole 42a formed by providing a conductor in the terminal part 42 and forming a through hole in the terminal part 42. The board 6 can be electrically connected by protruding the pins 6a protruding from the tips of the metal fittings 6 and soldering them.

  The connection structure is not limited to the one shown in the figure. For example, a conductive part is provided in the terminal part 42, and it is brought into contact with a conductive part (both not shown) provided in the connection support seat 11, It may be connected by screwing.

  According to such a connection structure, since the connection work can be performed in a state where the substrate block 4 is placed in the sensor body 1, assembly is easy.

  Further, since no signal line is used for the connection of the board block 4, not only the number of parts is reduced, but also there is an advantage that the assembly work can be facilitated because it does not become an obstacle to the work compared to the case of using the lead wire. is there.

  FIG. 6 is an exploded perspective view showing another example of the heat detector of the present invention. FIG. 7 is a view showing another example of a mode in which the shielding plate 3 and the substrate block 4 are assembled to the sensor body 1 of the heat sensor of this mode, and FIG. 7A is a plan view seen from above. FIG. 7B is a sectional view seen from the side, and FIG. 7C is a plan view seen from below.

  In this example, the signal line 45 and the light guide 46 are directly connected to the substrate block 4.

  Here, the signal line 45 is connected to a connection terminal provided at the tip of the signal line 45, the light guide 46 is configured by an optical fiber or the like, and the base end is mounted on a printed circuit board inside the substrate block 4. Connected to the LED, the tip of the LED is led to an operation lamp display window provided at an appropriate position of the sensor body, receives light emitted from the LED, and lights or flashes as an operation display lamp.

  The substrate block 4 has no terminal portion, and has a structure in which the signal wire 45 and the light guide 46 are entirely covered with the waterproof protective layer 40, and is fixed to the sensor body in the same manner as described above. Is done. Since the other components are the same as described above, the same reference numerals are given to the drawings, and descriptions thereof are omitted.

The attachment procedure of the board block in the fire sensor of the present invention is shown, (a) shows the state before the board block is attached, and (b) shows the state after the board block is attached. The exploded perspective view which shows an example of the fire detector of this invention It is a figure which shows an example of the aspect which attached the shielding board and the board | substrate block to the detector body of the fire detector of FIG. 2, (a) is a top view when it sees from upper direction, (b) is a longitudinal cross-sectional view, (C) is a bottom view when viewed from below The figure which shows the state which mounted the board block on the terminal connection support seat The figure which shows the state which mounted the board block on the terminal connection support seat and connected to the connection terminal of the sensor body The exploded perspective view which shows the other example of the fire detector of this invention It is a figure which shows the other example of the aspect which attached the shielding board and the board | substrate block to the detector body of the fire detector of FIG. 6, (a) is a top view when it sees from upper direction, (b) is a longitudinal cross-sectional view , (C) is a plan view when viewed from below Schematic longitudinal section showing the structure of a conventional fire detector

Explanation of symbols

A body part 1 sensor body 2 protector part 13 board block mounting support seat 13a small protrusion 4 board block 40 waterproof protective layer 41a mounting hole 44 heat detection element 45 signal line

Claims (1)

In the fire detector with the substrate block that constitutes the detection control unit built in the detector body,
The board block forms a mounting hole, and the sensor body is provided with a board block mounting support seat formed with a small protrusion having an outer diameter smaller than the inner diameter of the mounting hole.
The board block is placed on a shielding plate that is mounted and accommodated in the sensor body, and is placed on the board block mounting support seat so that the small protrusion protrudes from the mounting hole. In this state, the tip of the small protrusion protruding from the mounting hole is melted and fixed to the board block mounting support seat ,
Furthermore, the board block is covered with a waterproof protective layer at least when the board block is placed on the shielding plate, and the mounting hole is formed by protruding from the board block. A fire detector formed on a piece and having a structure in which the attachment piece is exposed from the waterproof protective layer .

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