JP4772420B2 - Fire detector - Google Patents

Description

  The present invention relates to a fire detector in which a circuit board is sealed with a sealing body.

  As a fire sensor, a waterproof fire sensor having a waterproof function is used. This sensor has a temperature detection element mounting wiring board standing on the back surface of the electronic component mounting wiring board, and the electronic component mounting wiring. The periphery of the plate is covered with a sealing body (for example, see Patent Document 1).

JP 2005-71139 A

In the conventional example, an internal structure and a cover are provided on the body head of the body. The cover covers the back surface of the electronic component wiring board, and the temperature detection element mounting wiring board is inserted through the hole. Therefore, the structure is complicated and the number of manufacturing steps increases.
In addition, since the electronic component wiring board and the lead wire lead-out portion are integrally covered with the sealing body, it is difficult to adjust the directing direction of the lead wire.

  In view of the above circumstances, an object of the present invention is to simplify manufacturing. Another object is to allow the lead wire to be adjusted in any direction.

The present invention includes a fire detection unit including detection elements such as heat, smoke, and flame, a circuit board on which the fire detection unit and electronic components are mounted, a lead wire connected to a terminal unit of the circuit board, and the circuit A hot melt comprising a first covering portion that covers a connection portion between a substrate and the lead wire lead portion, and a second covering portion that is provided apart from the first covering portion and covers only the lead wire lead portion. A fire sensor comprising a molded body and a fixing means for fixing the hot melt molded body to the main body , wherein the second covering portion of the hot melt molded body is rotatable to the locking portion of the main body It is supported by .

Since the present invention is configured as described above, the number of manufacturing steps can be reduced as compared with the conventional example. Therefore, it is possible to simplify the manufacturing.
In addition, a second covering portion that is provided apart from the first covering portion and covers only the lead wire drawing portion is provided, and the second covering portion is fixed to the locking portion of the main body or is rotatably supported. Thereby, the lead-out direction of the lead wire can be fixed or rotated in any direction with respect to the circuit board.

A first embodiment of the present invention will be described with reference to FIGS.
The non-waterproof fire detector 1 includes a main body 5 containing a circuit board 3 and a protector 6 attached to the main body 5.

  The circuit board 3 is provided with an electronic component (not shown) and a thermostat 10 constituting the fire detection unit 8. A heat collecting plate 9 is provided at the tip of the fire detection unit 8, and the heat collecting plate 9 is connected to the thermostat 10.

Although a bimetal (heat detector) is used as a fire detection element of the fire detection unit 8, it is not necessarily limited to this. For example, a photoelectric element (smoke detector), a pyroelectric element (flame detector) , Etc. can be appropriately selected as necessary.
A plurality of pin holes 12 are provided on the outer peripheral edge of the circuit board 3 at intervals in the circumferential direction.

  The circuit board 3 and the thermostat 10 are fixed to a mold for a hot melt molded body (not shown), hot melt molding is performed, and both 3 and 10 are integrally sealed with a sealing body 14 made of a polymer polyester resin or nylon resin. And the hot-melt molded object H is comprised.

  At this time, the columnar portion 10a in which the thermostat 10 is embedded is integrally formed with the rectangular portion 3a in which the circuit board 3 is embedded, so that a hot-melt molded body H having a convex shape as a whole is formed. A pin insertion hole 16 is provided through the rectangular portion 3a of the hot-melt molded body H, a terminal fitting mounting portion 20 is provided on the upper surface thereof, and an engagement step portion 18 is provided on the outer periphery thereof. Is formed.

  The pin 22 is inserted into the pin insertion hole 16 of the rectangular portion 3a and the pin hole 12 is passed through. The distal end portion 22a protrudes from the pin insertion hole 16, and the terminal fitting 24 is screwed to the distal end portion 22a. Fix to the bracket mounting portion 20.

As shown in FIG. 2, the cylindrical portion 10 a of the hot melt molded body H is inserted from the central through-hole 4 a of the top wall 4 of the main body 5, and the engagement step portion 18 of the rectangular portion 3 a is locked upright from the main body 5. The claw 26 is engaged and fixed to the top wall 4.
After the heat collecting plate 9 is fitted to the columnar part 10 a, the protector 6 is put on the main body 5, and a hook of the protector 6 (not shown) is locked in the engagement hole of the top wall 4 and fixed.
At this time, each leg tip portion of the protector 6 (not shown) is fitted into a concave portion provided radially on the inclined surface of the main body 5 to increase the strength against external force applied to each leg tip portion.

  In this embodiment, all parts of the circuit board 3 other than the part facing the pin insertion hole 16 are covered with the sealing body 14, so that the circuit board 3 is completely sealed unless condensation or the like enters from the pin insertion hole 16. . Further, the hot melt molded body H can be securely fixed to the main body 5 only by being locked to the locking claw 26.

Furthermore, since the terminal metal fitting mounting portion 20 is provided on the hot melt molded body H, it is not necessary to provide a back cover (not shown) for attaching the terminal metal 24.
In addition, although not shown in figure, you may accommodate the hot-melt molded object H fixed to the back cover which attached the terminal metal fitting 24 in the surrounding wall provided in the main body.

A second embodiment of the present invention will be described with reference to FIG. 2. The same reference numerals as those in FIG. 1 have the same names and functions.
The difference between this embodiment and the first embodiment (FIG. 1) is that a screw 28 is used instead of a hook as means for fixing the hot melt molded body H to the top wall 4.

  In this embodiment, a plurality of screw holes 28a are erected from the main body 5 at intervals in the circumferential direction on the outer periphery of the rectangular portion 3a of the hot melt molded body H, and the screws 28 are inserted into the screw holes 28a and screwed. To wear.

A third embodiment of the present invention will be described with reference to FIGS. 4 and 5. The same reference numerals as those in FIG. 1 have the same names and functions. The back cover 39 in FIG. 5 is used in a fourth embodiment described later.
The fire detector of this embodiment is a waterproof fire detector 31 and has the following differences from the non-waterproof fire detector of the first embodiment.

  (1) The hot-melt molded body is composed of a first covering portion H1, and the first covering portion H1 and a separate second covering portion H2. The first covering portion H1 is composed of a rectangular portion 3a in which the circuit board 3 is embedded and a cylindrical portion 10a in which the thermostat 10 is embedded. The first covering portion H1 covers the connecting portion 30b of the lead portion 30a of the lead wire 30.

The second covering portion H2 is provided apart from the first covering portion H1, and covers only the lead portions 30a of the plurality of lead wires 30. The second covering portion H2 is formed in a quadrangular prism shape, but the arrangement position, shape, size, and the like of the second covering portion H2 are appropriately selected as necessary. The second covering portion H2 is attached and fixed to a fitting type locking portion 33 formed on the top wall 4 of the main body 5.
Therefore, the lead-out portion 30a of each lead wire 30 can be oriented in a predetermined direction without using any other fixing parts, so that the sensor is attached to the top surface etc. after being connected to the sensor wiring (not shown). The workability when doing so is improved.

  In addition, although the square cylinder body in which the 2nd coating | coated part H2 can be inserted is used as the latching | locking part 33, it is not necessarily restricted to this, For example, you may form in cross-sectional U shape.

  (2) Since no terminal fitting is required, the rectangular portion 3a is not provided with a pin hole. Therefore, since the circuit board 3 is entirely covered with the sealing body 14, it is completely sealed.

A fourth embodiment of the present invention will be described with reference to FIGS. 6 and 7. The same reference numerals as those in FIG. 4 have the same names and functions. The differences between this embodiment and the third embodiment are as follows.
(1) A rotary shaft portion 35 projects from the side surface of the second covering portion H2, and a fitting hole 36 that rotatably supports the rotary shaft portion 35 is provided in the locking portion 33A. By thus supporting the second covering portion H2 in a rotatable manner, the drawing direction of the drawing portion 30a of the lead wire 30 can be adjusted and directed in a predetermined direction.

The locking portion 33A is formed in a U-shaped cross section. However, it is not always necessary to form the locking portion 33A. For example, two support columns each provided with a fitting hole 36 are parallel to each other at a predetermined interval. The fitting holes 36 may be opposed to each other.
In addition, the projections and recesses of the rotating shaft 35 and the fitting hole 36 are reversed, the portion corresponding to the rotating shaft 35 is a recess, and the portion corresponding to the fitting hole 36 is fitted in the recess. It may be part.

  (2) The first covering portion H <b> 1 is housed in a rectangular housing 37 formed on the top wall 4. The housing 37 is closed by a back cover 39, and a locking portion 37a provided on the outside of the housing 37 engages with an engaging portion 39a provided on the inside of the side wall of the back cover 39 so that both are fixed. ing.

A fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. The same reference numerals as those in FIG. 4 have the same names and functions. The differences between this embodiment and the third embodiment are as follows.
(1) Since the protector portion is integrated with the main body 5, the number of assembling steps is smaller than that in the above embodiment.

(2) The hot melt molded body H is not divided into a first covering portion H1 and a second covering portion H2, and the hot melt molded body H includes the circuit board 3, the lead portion 30a of the lead wire 30, and the thermostat 10. Is covered.
(3) The hot melt molded body H is provided with a mounting screw hole 42, and a screw 44 is inserted into the screw hole 42. The molded body H is screwed to the annular mounting portion 46 at the base end of the main body 5. Yes.

  (4) In the hot melt molded body H, the first cylindrical portion 3b and the second cylindrical portion 10b are integrally formed. Therefore, in each of the embodiments, the number of components can be reduced, and the assembly method is simple, so that the productivity can be improved.

1 is a longitudinal sectional view showing a first embodiment of the present invention. It is a block diagram which shows 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of this invention. It is a block diagram which shows 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of this invention. FIG. 6 is an enlarged perspective view showing a relationship between a second covering portion and a locking portion. It is a longitudinal cross-sectional view which shows 5th Embodiment of this invention. It is a block diagram of 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-waterproof fire detector 3 Circuit board 4 Top wall 5 Main body 8 Fire detection part 8a Fire detection part unit 10 Thermostat 14 Sealing body 24 Terminal metal fitting 26 Locking claw 30 Lead wire 30a Lead-out part 30b Connection part 31 Waterproof fire Sensor H Hot-melt molded body H1 1st coating part H2 2nd coating part

Claims (1)

A fire detection unit including detection elements such as heat, smoke, and flame, a circuit board on which the fire detection unit and electronic components are mounted, a lead wire connected to a terminal part of the circuit board, the circuit board and the lead A hot melt molded article comprising: a first covering portion that covers a connecting portion of a lead portion of the wire; and a second covering portion that is provided apart from the first covering portion and covers only the lead portion of the lead wire; A fire detector comprising a fixing means for fixing the hot melt molded body to the main body ,
The fire detector , wherein the second covering portion of the hot melt molded body is rotatably supported by the locking portion of the main body .

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