JP4236619B2 - Alarm - Google Patents

Description

  The present invention extends a pair of lead wires from a thermistor portion having a temperature dependency in resistance value, and of the lead wires, a covering portion formed to be hard by insulating coating is provided on the thermistor portion side, A heat detection element having a hard base end portion embedded in an insulating material on the opposite side to the thermistor portion is provided, the base end portion is attached to a circuit board provided in a casing in a standing posture, and the thermistor portion is The present invention relates to an alarm device disposed so as to protrude from an opening provided in the casing.

  Conventionally, as this type of alarm device, a thermistor part configured to be able to energize a thermistor whose resistance value is temperature-dependent is covered with an insulating material, and a pair of lead wires are extended from the thermistor part, and the lead wire There is known a configuration in which a mounting portion for electrical connection to a circuit board is formed at the end of the heat sensing element, and a thermistor portion is disposed and fixed facing an opening provided in the casing (for example, Patent Document 1). reference).

  This thermal detection element is provided with a hard coating portion formed by hard coating a lead wire on the side of the thermistor portion, and an insulating material at the end of the lead wire on the side opposite to the thermistor portion. An embedded base that is hard and coated is provided. And the terminal part for electrically connecting the edge part of a lead wire to a circuit board is extended from the said embedded base, and the said attaching part is formed. Furthermore, a soft coating portion is formed between the hard coating portion and the embedded base portion by insulatingly covering the lead wires.

As described above, if the lead wire on the thermistor portion side is provided with the hard coating portion, the lead wire of the heat detection element is easily maintained in a self-supporting posture.
In addition, in order to electrically connect the end of the lead wire to the circuit board on the side opposite to the thermistor part, if the mounting part is formed by extending the terminal part from the hard embedded base, the mounting part is the circuit board. In addition to being mounted in a stable posture, the soldering operation can be performed mechanically, so that the heat detection element can be incorporated into the heat detection device with good workability.

In addition, if a soft covering portion is formed between the hard covering portion and the embedded base portion, an external force is inadvertently applied to the heat detecting element when handling the circuit board to which the heat detecting element is attached. However, the soft covering portion is more easily deformed than the hard covering portion. Therefore, the hard covering portion is not deformed and only the soft covering portion is likely to be deformed.
At this time, the heat detecting element is oscillated and deformed around the soft covering portion while being attached to the circuit board. In this state, the posture adjustment of the heat detection element can be performed by an operation that only deforms and restores the soft covering portion.

Here, the length of the soft covering portion of the heat detection element is set to 1/10 or more and 1/2 or less of the length of the hard covering portion.
In other words, if the length of the soft covering portion is set to 1/10 or more of the length of the hard covering portion, the thermistor corresponding to the tip of the heat detection element when the heat detection element is mounted and fixed in a standing posture on the circuit board. Even if the assembly operator touches carelessly, bending moments are unlikely to occur in the hard coating part, so it is easy to absorb stress with only the soft coating part, and inconvenience such as breakage of lead wires in the hard coating part Is unlikely to occur. In addition, if the length of the soft covering portion is set to ½ or less of the length of the hard covering portion, the flexibility of the soft covering portion can be suppressed and the shape stability of the entire heat detection element can be kept high. During the assembly operation of the detection device, the thermistor portion can be easily positioned.

Japanese Patent Laid-Open No. 2002-277334 (refer to claims, FIG. 1 etc.)

  The heat detection element in the alarm device described in Patent Document 1 is configured to prevent inconvenience such as breakage of lead wires during assembly work and to maintain high shape stability as the entire heat detection element. . Therefore, handling of the heat detection element during the operation of incorporating the heat detection element into the alarm casing is facilitated.

  On the other hand, there is a case where it is desired to finely adjust the position of the heat detection element protruding from the opening to, for example, the center of the opening provided in the casing after the heat detection element is incorporated into the casing of the alarm device.

At this time, if the length of the soft coating is simply set based on the length of the hard coating as in the heat detection element described in Patent Document 1, the following inconvenience occurs.
In other words, the set length of the soft covering portion is set to 1/10 or more and 1/2 or less of the length of the hard covering portion, and the hard covering portion that is unlikely to be bent is more than half of the length of the heat detection element. Because it is configured to occupy, when the projecting heat sensing element is urged to deform the heat sensing element, the deformation supporting point of the heat sensing element (near the boundary between the hard coating part and the soft coating part) is from the opening. It will be far away. Since the length of the portion protruding from the opening is shorter than the distance from the opening to the deformation fulcrum, the biasing force for deforming the protruding heat detection element is increased. The soft covering portion contributes to the deformation of the heat detection element. However, since the length of the soft covering portion is short as a whole, a desired amount of deformation may not be obtained even if the urging force is increased. .
Furthermore, there is a possibility that the lead wire may be broken by increasing the urging force.
For this reason, it is difficult to adjust the position of the heat detection element by operating the heat detection element protruding from the opening of the casing after the heat detection element is incorporated in the casing of the alarm device.

  Accordingly, an object of the present invention is to provide an alarm device that can easily fine-tune the position of the heat detection element after the heat detection element is incorporated in the casing.

In order to achieve the above object, an alarm device according to the present invention extends a pair of lead wires from a thermistor portion whose resistance value is temperature-dependent, and insulates the lead wire from the thermistor portion side. And a heat sensing element having a hard base end portion embedded in an insulating material on the opposite side of the thermistor portion, and a circuit provided with the base end portion in a casing. An alarm device that is attached to a substrate in a standing posture and is arranged so that the thermistor part protrudes from an opening provided in the casing, the first characteristic configuration is between the covering part and the base end part, A position adjusting unit for adjusting the position of the thermistor with respect to the opening; and a part of the covering, and more than half of the length of the covering is projected from the opening , and the heat detection The deformation fulcrum of the element Lies in that the presence in the vicinity of the opening portion comprising an end portion of the position adjusting section.

  After installing the heat detection element in the casing of the alarm device, if you want to fine-tune the position of the heat detection element protruding from the opening, for example, to the center of the opening provided in the casing, the tip of the heat detection element protruding from the opening In such a state that the heat detection element is picked, etc., adjustment is performed to deform the heat detection element so that the heat detection element is in the center and perpendicular to the opening. At this time, the force applied to the heat detection element is concentrated in the vicinity of the boundary between the hard covering portion and the position adjustment portion, so that the end of the position adjustment portion becomes a deformation fulcrum of the heat detection element.

Here, half the total length of the cover portion of the total length (L) of the cover portion (L / 2) or more in length protruded from the opening, the deformation fulcrum were order to that exists in the vicinity of the opening portion, projecting heat The biasing force for deforming the sensing element is smaller than when the deformation fulcrum is far from the opening. Furthermore, since the deformation fulcrum exists in the vicinity of the opening and the portion of the lead wire that is not the covering is long, for example, the left and right movable ranges of the deformation fulcrum become large.

Therefore, with the alarm device described in the first characteristic configuration of the present invention, the position of the heat detection element can be finely adjusted with a small force, and the range in which the fine adjustment can be performed is widened. Further, since the urging force is small, there is almost no possibility of inconvenience such as breakage of the lead wire.
The manufacturing error of the heat detection element and the assembly error with respect to the circuit board can be easily finely adjusted by the deformation of the position adjusting unit.

  The second characteristic configuration of the alarm device according to the present invention is that the position adjusting portion is formed by making the lead wire non-linear.

  According to said 2nd characteristic structure, after an assembly operation, when an operator fine-tunes the position of the thermistor part in a heat sensing element, the range which can deform | transform a lead wire becomes wide. For example, not only the left / right position adjustment but also the adjustment of further pulling the thermistor part out of the opening is possible, and the adjustment position range of the thermistor part in the heat detection element can be set wide.

Embodiments of the present invention will be described below with reference to the drawings.
The alarm device of the present invention is a fire alarm device as a heat detection device, a composite that enables both a fire alarm and a gas alarm, or can detect the carbon monoxide gas and the like to monitor the indoor air cleanliness. An alarm device or the like is preferably exemplified. In this embodiment, a case where a fire alarm is used will be described.

As shown in FIGS. 1 and 2, the fire alarm device X is provided with a heat detection element A.
The heat detection element A includes a thermistor portion 1 in which an electrode 12 is provided on a thermistor 11 having a temperature dependency in resistance value, and a pair of lead wires 2 are extended to these electrodes 12.
Of the lead wire 2, the thermistor portion 1 is provided with a covering portion 8 that is hardened by insulating coating. Further, a hard base end portion 6 embedded in an insulating material is formed on the side opposite to the thermistor portion 1.

  The covering portion 8 is formed hard by dip-coating the vicinity of the thermistor portion 1 with, for example, an insulating epoxy resin. By thus forming the vicinity of the thermistor portion 1 of the heat detection element A hard, the hard coating portion of the lead wire 2 is difficult to bend.

The base end portion 6 forms a part of the attachment portion 4 between the circuit board 31 and the lead wire 2.
That is, the base end portion 6 connects the end portions 21 of the pair of lead wires 2 to the connection portions 51 provided on the upper end side of the “G” -shaped terminal member 5, respectively. 2 is coated with, for example, an insulating epoxy resin to be hard.
The terminal member 5 is provided with a soldering portion 52 for soldering and fixing to the circuit board 31 on the lower end side of the “G” -shaped terminal member 5, and the soldering portion 52 is exposed from the base end portion 6 to be a terminal portion. 7 is formed.
Further, the terminal member 5 is formed with a stopper 53 for restricting the penetration depth of the terminal member 5 into the circuit board 31 on the lateral end side of the terminal member 5.

As described above, the heat detection element A is attached to the circuit board 31 in a standing posture at the base end portion 6, and is disposed so as to protrude the thermistor portion 1 from the opening portion 33 provided in the casing 32.
A plurality of fins 34 are arranged at equal intervals around the opening 33 in the casing 32 so as to surround the protruding thermistor portion 1. The flow of the atmosphere is rectified by the fins 34 and guided to the thermistor section 1. Further, a donut-shaped rectifying plate 35 can be provided at the upper end of the fin 34. Thereby, the flow of the atmosphere can be rectified in a tunnel shape and more reliably guided to the thermistor portion 1.

  Further, a position adjusting unit 9 that adjusts the position of the thermistor unit 1 with respect to the opening 33 is provided between the covering unit 8 and the base end unit 6. The position adjustment of the thermistor unit 1 with respect to the opening 33 is performed such that the axis of the thermistor unit 1 is at the center of the circular opening 33, for example. This embodiment demonstrates the case where the position adjustment part 9 is made into the soft coating | coated part 9 which covered the lead wire 2 with the insulating polyimide tube, and was formed softly.

  Since the soft covering portion 9 is provided in parallel by covering the pair of lead wires 2 individually with a soft insulating material, the entire soft covering portion 9 is difficult to bend in the direction in which the lead wires 2 are juxtaposed, In the direction intersecting with the direction in which the lead wires 2 are juxtaposed, it is formed as a posture regulating portion 9a that is easily bent.

Here, the hard covering portion 8 is hard enough to exhibit shape restoring properties while allowing elastic deformation for a predetermined amount of deformation, and the soft covering portion (position adjusting portion) 9 is deformed. It is formed with a hardness that allows plastic deformation to maintain the posture.
Further, the covering portion 8 and the soft covering portion 9 are fixed when the heat detection element A is fixed at the center position in the height direction, and when both ends are subjected to a hardness test to measure a deformation load with a push-pull gauge, It is formed with a hardness such that the load on the cover 8 side is about 6 to 10 times the load on the soft cover 9 side. Accordingly, even if an external force is inadvertently applied to the heat detection element A attached to the circuit board 31 in an upright posture, the soft covering portion is less likely to be generated than the covering portion 8 in which a bending moment is not easily generated. Since 9 is more easily deformed, the covering 8 is not deformed, and only the soft covering 9 is deformed. Therefore, the position of the thermistor portion 1 relative to the opening 33 can be adjusted in the soft covering portion 9.

  Accordingly, during the assembly work for incorporating the heat detection element A into the casing 32 of the alarm device X, the covering portion 8 is not easily deformed, so that it is difficult to restore the shape and the assembly workability of the alarm device X is reduced. It is possible to prevent the soft covering portion 9 from being deformed more than necessary and difficult to restore its shape.

Here, by controlling the protrusion amount of the covering portion 8 with respect to the opening portion 33, the position adjustment of the thermistor portion 1 with respect to the opening portion 33 after the assembling work can be favorably performed.
That is, it is configured so that a part of the covering portion 8 and half or more of the length of the covering portion 8 protrude from the opening 33. That is, in FIG. 1, the entire covering portion 8 does not protrude from the opening portion 33, and the opening portion has a length that is half (L / 2) or more of the entire length of the covering portion 8 with respect to the entire length (L) of the covering portion 8. It will be in the state which projects from 33. For example, the ratio of the length of the covering portion 8 protruding from the opening portion 33 to the length of the covering portion 8 not protruding from the opening portion 33 is set to 7: 3.

  Then, after the assembly work, when the axis of the heat detection element A is biased with respect to the center of the opening 33 and the heat detection element A does not stand upright, the operator finely positions the thermistor 1. Adjust.

For example, the front end portion a of the heat detection element A is biased in a desired direction (FIG. 3A: arrow direction). At this time, it is considered that the heat detection element A swings in the direction of the arrow with the vicinity of the boundary between the hard base end portion 6 and the soft covering portion 9 as a fulcrum. And, for example, when the heat detecting element A is swung until the covering portion 8 comes into contact with the peripheral portion of the opening 33, the heat detecting element A is inclined, so that the protruding covering portion 8 is picked. Thus, adjustment is performed to deform the heat detection element A so that the heat detection element A is in the center and perpendicular to the opening 33. At this time, the end portion of the position adjusting portion 9 (near the boundary between the hard coating portion and the soft coating portion) serves as a deformation fulcrum S of the heat detection element, and the heat detection element A is deformed.
Here, since the length more than half (L / 2) of the full length of the covering portion 8 with respect to the full length (L) of the covering portion 8 is projected from the opening portion 33, the deformation fulcrum S is in the vicinity of the opening portion. Will exist. Therefore, the biasing force for deforming the protruding heat detection element A is smaller than when the deformation fulcrum S is far from the opening 33. Furthermore, since the deformation fulcrum S exists in the vicinity of the opening, for example, the left and right movable ranges of the deformation fulcrum S are increased.
Therefore, it is possible to finely adjust the position of the heat detection element with a small force, and further, the range in which the fine adjustment can be performed is widened. Further, since the urging force is small, there is almost no possibility of inconvenience such as breakage of the lead wire 2.

  For fine adjustment of the position of the heat detection element A, the position of the thermistor unit 1 is usually positioned at the center of the opening 33 provided in the casing 32, for example, but is not limited to this. The heat detection element A may be deformed until it comes into contact with the peripheral portion.

Embodiments of the present invention will be described below with reference to the drawings.
The thermal detection element A in FIG. 1 has a lead wire 2 connected to a thermistor having a size of about 0.5 mm × 0.5 mm, and dip-coating an epoxy resin from the front end side of the thermistor portion 1 to a diameter of about 2 mm. The coating portion 8 formed in a hard shape is provided, and a soft coating portion (position adjusting portion) 9 in which the lead wire 2 is covered with a polyimide tube over about 20 mm is provided following the coating portion 8.
The lead wire 2 extending from the soft covering portion 9 is connected to the terminal member 5 formed with a soldering portion having a longitudinal dimension of about 3.3 mm at the connection portion 51 and the connection portion 51 of the terminal member 5. To the end of the soft covering portion 9 is coated with epoxy resin to provide a base end portion 6 having a height dimension of 4 mm and a terminal portion 7 in which a soldering portion 52 of the terminal member 5 is formed in a protruding manner.

The heat detection element A is in a state in which the covering 8 protrudes from the opening 33 by about 7 mm. At this time, the length of the covering portion 8 that does not protrude from the opening 33 is about 3 mm.
After the assembly work, as shown in FIG. 3A, the axis of the heat detection element A may be biased with respect to the center of the opening 33. The position of the thermistor section 1 in the element A is finely adjusted.
First, the front-end | tip part a of the heat detection element A is urged | biased in a desired direction (Fig.3 (a): arrow direction). Then, adjustment is performed to deform the heat detecting element A so that the heat detecting element A is in the center and perpendicular to the opening 33 by picking the protruding covering portion 8 or the like.
At this time, since the length (7 mm) of half or more of the total length of the covering portion 8 with respect to the total length (10 mm) of the covering portion 8 protrudes from the opening portion 33, the deformation fulcrum S exists in the vicinity of the opening portion, and the deformation fulcrum For example, the left and right movable ranges of S are large. Therefore, the position of the thermistor portion 1 in the heat detection element A can be finely adjusted to the center of the opening 33 with a small urging force (FIG. 3B).

[Another embodiment]
In the embodiment described above, the position adjusting portion 9 can be formed by making the lead wire 2 non-linear.
For example, as described above, when the position adjusting portion 9 is a soft covering portion 9 that is softly formed by covering the lead wire 2 with an insulating polyimide tube, the soft covering portion 9 is formed in a non-linear shape. .
Here, the non-linear shape means that, as shown in FIG. 4, the side view of the soft covering portion (position adjusting portion) 9 is curved (FIG. 4 (a)) or U-shaped (FIG. 4 (b)). Any shape can be applied as long as the shape is not linear.

By forming in this way, after the assembly work, when the operator finely adjusts the position of the thermistor portion 1 in the heat detection element A, the range in which the lead wire 2 can be deformed is widened. For example, not only the left and right position adjustment but also the adjustment of further pulling the thermistor part 1 out of the opening is possible, and the adjustment position range of the thermistor part 1 in the heat detection element A can be set wide.
In addition, when adjusting the position in the vertical direction, the position of the heat detection element A can be easily adjusted by adjusting the length of the covering portion 8 so that it is more than half of the entire length of the covering portion 8 protruding from the opening 33. Is maintained.

Schematic of the heat detection element provided in the alarm device of the present invention Schematic of the alarm device of the present invention Schematic diagram of relevant parts when adjusting the position of the heat detection element provided in the alarm device of the present invention Schematic of another embodiment of the position adjustment part of the heat detection element provided in the alarm device of the present invention

Explanation of symbols

A Heat detection element 1 Thermistor part 2 Lead wire 31 Circuit board 32 Casing 33 Opening part 6 Base end part 8 Covering part 9 Position adjustment part

Claims (2)

A pair of lead wires are extended from a thermistor portion having a temperature dependency in resistance value, and a covering portion is formed on the thermistor portion side of the lead wire so as to be hardened by insulation coating, and the thermistor portion; Comprises a heat sensing element with a hard base end embedded in an insulating material on the opposite side,
The base end portion is attached to a circuit board provided in a casing in a standing posture, and the thermistor portion is disposed so as to protrude from an opening provided in the casing,
Between the covering part and the base end part, a position adjusting part for adjusting the position of the thermistor part with respect to the opening part is provided,
Of the covering portion, a part thereof, and more than half of its length is projected from the opening ,
An alarm device in which a deformation fulcrum of the heat detection element is located at an end of the position adjusting unit and in the vicinity of the opening .   The alarm device according to claim 1, wherein the position adjusting unit is formed by making the lead wire non-linear.

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