JP2006172322A - Waterproof fire detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple waterproof fire detector capable of detection even if water enters into the body of the detector. <P>SOLUTION: A base block 2 forming a detection control part mounted inside the detector body 1 of the fire detector is covered with an even waterproof protective layer 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a waterproof fire detector.

  In the conventional fire detector, the board block constituting the detection control unit is housed in the detector body with the electronic components and circuits exposed, and is not waterproofed at all. Further, since the circuit components are exposed, there is a possibility that the circuit board mounted on the board or the circuit component may be damaged when the board block is mounted in the body.

  The present invention has been proposed to solve such problems, and a first object thereof is to provide a waterproof fire detector for the purpose of waterproofing and protecting the substrate block.

  It is a second object of the present invention to provide a waterproof fire detector that can be mounted in a state where the substrate block is placed in the detector body and can be electrically connected.

  In order to achieve the above object, the waterproof fire sensor according to claim 1 has a structure in which a substrate block constituting a detection control unit, which is built in the sensor body, is covered with a uniform waterproof protective layer. Yes.

  According to a second aspect of the present invention, the substrate block is provided with a terminal portion, and the terminal portion is exposed from the waterproof protective layer.

  According to a third aspect of the present invention, the board block further includes a mounting hole, and the sensor body includes a board block mounting support seat and a terminal connection support seat, and the board block has the mounting hole section mounted on the board block. In addition to being fixed to the support seat, the terminal portion is placed on the terminal connection support seat and connected to a connection terminal provided in the sensor body.

  The present invention can be applied as a heat sensor, a smoke sensor, a combined heat and smoke sensor, etc., and the operation of the detection control unit is guaranteed even if some water enters the sensor body.

According to the waterproof fire sensor of the first aspect, if the waterproof protective layer is formed of a resin film, the waterproof fire detector is uniform, and thus warpage and sink are unlikely to occur. Therefore, deformation of the block substrate can be prevented.
In addition, since the substrate block is protected by the protective protective film, not only the waterproof effect but also the contact with the outside air and the damage due to the contact with the outside are not caused.
Further, since it is not necessary to provide an accommodation space for protection in the sensor body, the structure of the sensor can be simplified and compactly formed.

  According to the second aspect of the present invention, since the terminal portion is exposed from the waterproof protective layer, the electrical connection work can be performed by soldering or the like after the substrate block is accommodated in the sensor body. Moreover, since it accommodates in the state in which a lead wire etc. are not connected, there is no wiring etc. at the time of an assembly, and it is excellent in workability.

  According to the third aspect, since the terminal portion is placed on the terminal connection support seat provided in the sensor body and the substrate block is fixed in a stationary state, the connection work is performed, so that the work can be performed reliably and easily.

  Hereinafter, two embodiments of the present invention will be described with reference to the accompanying drawings.

  Example 1 shows a waterproof fire detector in which a substrate block provided with a terminal portion is installed in a sensor body.

  Further, the second embodiment shows a waterproof fire detector in which a light guide and lead wires are connected in advance to a circuit board, and a board block without a terminal portion is built in the sensor body.

  FIG. 1 is an exploded perspective view showing an example of a waterproof fire sensor of the present invention.

  In the figure, 1 is a sensor body, 2 is a substrate block, 3 is a shielding plate, and 4 is a protector section.

  The substrate block 2 has a structure in which a circuit board 20 (see FIG. 2) on which an electronic component 25 is mounted is covered with a waterproof protective layer 23 having a uniform thickness.

  The circuit board 20 is provided with an attachment piece 21 having an attachment hole 21a as an attachment hole portion, and a terminal portion 22 having a connection hole 22a. A heat detection element 24 composed of a thermistor or the like is provided on the lower surface. The mounting pieces 21 and 21, the terminal portions 22 and 22, and the heat detection element 24 are structured to be exposed from the waterproof protective layer 23. The covering structure by the waterproof protective layer 23 and the terminal portion 22 will be described later.

The sensor body 1 and the protector part 4 are integrally molded to constitute a main body part A.
The main body A has a communication opening 10 formed by integrally molding the body 1 and the protector 4, and the communication opening 10 is separated from the space inside the body 1 and the space inside the protector 4 by the shielding plate 3. Is to be blocked.

  In addition, the sensor body 1 is provided with terminal connection support seats 11 and 11 and board block mounting support seats 12 and 12 having small protrusions 12a at the ends in order to house the substrate block 2 therein. . Reference numeral 5 denotes a plug blade receiving connection terminal, which is fixed to a support seat 51 protruding from the bottom surface of the sensor body 1 by screws 5a. A method of connecting the terminal portion 22 of the substrate block 2 and the plug blade receiving connection terminal 5 will be described later.

The shielding plate 3 is provided with a flange 31 on its bottom surface 33, and an insertion hole 34 of the heat detection element 24 is formed at the center of the flange 31, and a peripheral wall 32 is provided so as to surround the periphery.
Here, the insertion hole 34 is an invitation inclined surface inclined from the outer periphery of the insertion hole 34 toward the hole in order to eliminate the catch when the heat detection element 24 is inserted when the substrate block 2 is installed in the sensor body 1. 34a is formed (see FIG. 4B).

  When used as an actual fire detector, a base portion attached to the ceiling surface is attached above the main body portion A, and the detector body 1 is placed in a fixed direction with respect to the base portion. By rotating, the plug blade receiving connection terminals 5 and 5 provided in the sensor body 1 and the plug blade connection terminals (not shown) provided corresponding to the inside of the base portion are fitted to each other, and the ceiling surface or the like. Mounted on.

  According to such a structure, the thermistor 24 protruding from the lower surface of the substrate block 2 is protruded into the protector portion 4 through the heat detection element insertion hole 34 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 a recess 10a formed around the communication opening 10 of the sensor body 1, the substrate block 2 is placed on the peripheral wall 32 of the shielding plate 3, and the sensor body 1 It can be mounted on the mounting support seats 12, 12 erected in the interior, and can be fixed inside the sensor body 1 (see FIGS. 4A and 4B).

  Hereinafter, structural features of each part of the fire detector of the present invention will be described.

  2A and 2B are explanatory views showing an example of the substrate block, wherein FIG. 2A is a perspective view of the substrate block before being covered with the waterproof protective layer, and FIG. 2B is a schematic vertical cross-section covered with the waterproof protective layer. FIG. FIG. 3 is a plan view, (b) front view, and (c) bottom view of a substrate block coated with a waterproof protective layer.

  In the substrate block 2, various electronic components 25 for constituting a sensing control unit are arranged and mounted on the upper surface of the circuit board 20 made of heat-resistant glass epoxy. Further, terminal portions 21 and 21 and mounting pieces 22 and 22 for electrical connection with the plug blade receiving connection terminal 5 are provided at each corner of the substrate 20. In the exposed state, it is covered with a uniform waterproof protective layer 23.

Such a waterproof protective layer 23 is formed by hot-melt molding a crystalline polymer polyester resin having crystallinity, but is not limited thereto.
The thickness in that case is preferably about 0.5 to 2.0 mm.

  The central portion 27 on the back surface where the waterproof protective film 23 is not applied is a portion that is concealed by the shielding plate 3 when the substrate block 2 is installed in the sensor body 1. Although there is some moisture intrusion due to the clearance with the inner peripheral edge of the insertion hole 34 of the shielding plate 3, there is no problem even if the covering of the waterproof protective layer 23 is excluded because it is not the side where the electronic component is not mounted.

  Reference numeral 26 denotes a window provided on the circuit board 20 so that the type symbol of the sensor written at the manufacturing stage is exposed, and this part is also provided with a waterproof protective layer for convenience of assembly. 23 coatings are excluded.

  In such a configuration, if the waterproof protective layer 23 is formed of a uniform resin film, warpage and sink marks of the resin film are less likely to occur, and therefore deformation of the block substrate can be prevented. Further, since the substrate block 2 is protected by the waterproof protective film 23, not only can the waterproofing be achieved, but there is no damage due to contact with outside air or contact with the outside.

  Furthermore, since it is not necessary to provide a storage space in the sensor body for protection, the main body can be made thin and the sensor main body can be made compact.

  Further, since the terminal portion 22 is exposed from the waterproof protective layer 23, after the substrate block 2 is accommodated in the sensor body 1, electrical connection work such as soldering between the terminals can be easily performed. it can.

  Moreover, since the lead wire etc. are not derived | led-out, the board | substrate block like the example does not become an obstacle at the time of an assembly, and is excellent also in workability.

  FIG. 4 shows the structure of a sensor body with a substrate block.

  The board block 2 places the mounting piece 21 on the mounting support seat 12 erected in the sensor body 1, and the small projections 12 a of the support seat section 12 are formed from the mounting hole 21 a of the mounting piece 21 of the board block 2. The tip is melted and fixed by pressing the iron 7 against the tip of the small protrusion 12a. (A), (b) of FIG. 5 has shown the operation | work procedure at this time.

  When the substrate block 2 is fixed in the sensor head 1 by such a method, the heating temperature of the iron 7 is set lower than the melting point of the mounting piece 21 of the substrate block 2 in order not to change the shape of the substrate block 2. Needless to say, the melting point of the small protrusion 12a is set higher than the melting point.

  In the case where the sensor body A is molded with ABS resin and the circuit board 20 of the substrate block 2 is made of glass epoxy resin, the temperature of the iron 7 at the time of heat deposition is preferably 220 to 230 ° C. .

In the illustrated example, the mounting hole 21a is formed in the mounting piece 21 formed at the corner end of the circuit board, and the mounting hole portion is formed at the portion exposed from the waterproof protective layer 23. Without providing a piece, a hole penetrating the waterproof protective layer 23 may be formed as an attachment hole portion.
Further, in the illustrated fire detector, the detector body 1 and the protector portion 4 are integrally formed of ABS resin, so that the mounting support seat 12 provided with the small protrusions 12a is made of the same material. Only the small protrusions 12a may be formed of a material that is easily melted and deformed by heating.

  According to such a structure that is thermally melted and fixed, screws are not required, the number of parts is reduced, and the substrate block 2 is removed from the sensor body 1 unless the substrate block 2, the mounting support seat 12 and the like are broken. Therefore, there is little risk of unauthorized use by removing the substrate block 2 and replacing others.

On the other hand, a shielding plate 3 is interposed between the circular communication opening 10 formed between the sensor body 1 and the protector 4 and the substrate block 2.
That is, the shielding plate 3 forms a concentric circumferential wall 32 above the circular flange 31 having a slightly larger outer diameter than the communication opening 10, and is formed at the center of the bottom surface 33 surrounded by the circumferential wall 32. Is formed with an insertion hole 34 through which the heat detection element 24 provided on the substrate block 2 side is inserted. The flange portion 31 can be accommodated without being misaligned by being fitted into a recess 10a formed around the communication opening 10 formed on the bottom surface of the sensor body 1, and further, the substrate block is disposed above the peripheral wall 32. By placing 2 in close contact, the communication opening 10 is closed, and the internal space of the sensor body 1 and the internal space of the protector unit 4 are blocked.
Therefore, the flow path of the air flowing from the inside of the sensor body 1 to the protector unit 4 is blocked by the flange 31 of the shielding plate 3, and the outside air that has entered the inside of the sensor body 1 from the ceiling surface or the like enters the protector unit 4. Thus, it is possible to prevent the thermal detection element 24 built in the protector unit 4 from being carelessly cooled to prevent the environmental temperature from being hindered.
FIG. 4A shows the action and effect of the shielding plate 3, and the arrows show the flow of airflow blocked by the shielding plate 3.

  Further, with such a structure, the shielding plate 3 is sandwiched between the recess 10a and the substrate block 2, and the substrate block 2 is fixed in the sensor body 1 so that it can be easily used without using screws or adhesives. Can be fixed.

  In the shielding plate 3, a guide inclined surface 34 a that opens in a tapered manner from the outer peripheral edge of the hole toward the hole is formed around the insertion hole 34 formed in the center of the bottom surface 33. The heat detection element 24 can be smoothly installed in the protector unit 4 without being caught in the insertion hole 34.

Next, the wiring connection structure of the substrate block will be described.
As shown in FIG. 1, the sensor body 1 performs wiring work in a state where the terminal portions 22 and 22 of the substrate block 2 are placed in addition to the substrate block mounting support seats 12 and 12 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 substrate block mounting support seats 12 and 12.

  6 is a partial schematic explanatory view showing a state in which the substrate block is placed on the connection support seat, and FIG. 7 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. The terminal portion 22 is placed on the terminal portion 22, a conductor is provided in the terminal portion 22, and a connection hole 22 a formed by forming a through hole in the terminal portion 22 is connected to the plug blade receiving connection terminal 5. The board block 2 can be electrically connected by protruding and soldering the pin 6a protruding from the tip of the metal fitting 6.

  The connection structure is not limited to the one shown in the figure. For example, a conductive portion is provided in the terminal portion 22, and it is brought into contact with a conductive portion (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 2 is left in the sensor body 1, the assembly is easy.
Further, since lead wires are not used for connecting the board block 2, not only the number of parts is reduced, but also there is an advantage that the assembly work can be easily performed because it does not become an obstacle to the work compared to the case of using the lead wires. is there.

  FIG. 8 is an exploded perspective view showing another example of the waterproof fire detector of the present invention.

In this example, the lead wire 28 and the light guide 29 are directly connected to the substrate block 2.
Here, the lead wire 28 is connected to a connection terminal provided at the tip of the lead wire 28 (not shown), the light guide 29 is composed of an optical fiber or the like, and the base end is on a circuit board inside the substrate block 2. Connected to the mounted LED, the tip of the LED is led to an operation lamp display window provided at an appropriate position of the sensor body, and the light emitted from the LED is lit or blinks as an operation display lamp.

  In such a structure, the board block 2 has no terminal portion, and the lead wire 28 and the entire light guide 29 are covered with the waterproof protective layer 23, and the same method as described above. It is fixed to the sensor body and is built in.

  Since the other components are the same as those in the first embodiment, the same reference numerals are given to the drawings, and descriptions thereof are omitted.

It is a disassembled perspective view which shows the 1st Example of a waterproof fire detector. It is explanatory drawing of a board | substrate block, (a) is a perspective view of the board | substrate block before coat | covering with a protective layer, (b) is a longitudinal cross-sectional view of the board | substrate block coat | covered with the waterproof protective layer. It is (a) top view, (b) front view, and (c) bottom view of a substrate block. The structure of the sensor main body which equipped the board | substrate block is shown, (a) is a top view of a sensor body, (b) is a longitudinal cross-sectional view. It is a partial expanded sectional view explaining the airflow blocking effect by a shielding board. (A), (b) is a figure which shows the state which fixes a board | substrate block in a sensor body by heat_contact | adhering. It is a figure which shows the state which mounted the board | substrate block on the terminal connection support seat. It is a partial longitudinal cross-section structure figure which shows the state. It is a disassembled perspective view which shows the 2nd Example of a waterproof fire detector.

Explanation of symbols

A Body 1 Sensor body 2 Board block (Sensing controller)
DESCRIPTION OF SYMBOLS 3 Shielding plate 4 Protector part 10 Communication opening 11 Terminal support connection seat 12 Board block attachment support seat 21a Installation hole part 22 Terminal part 22a Connection hole 23 Waterproof protective layer 24 Heat detection element

Claims (3)

  A waterproof fire detector, characterized in that a substrate block constituting a detection control unit, which is built in the detector body, is covered with a uniform waterproof protective layer. In claim 1,
The waterproof fire detector, wherein the substrate block has a terminal portion, and the terminal portion is exposed from the waterproof protective layer. In claim 2,
The board block further includes a mounting hole, and the sensor body includes a board block mounting support seat and a terminal connection support seat,
The board block has a structure in which the mounting hole is fixed to the board block mounting support seat and is connected to a connection terminal in the sensor body in a state where the terminal section is placed on the terminal connection support seat. Waterproof fire detector.

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