JPH02257399A - Thermosensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat sensor having a waterproof structure and having an alarm indicator light provided in a circuit housing part.

[Prior Art] Conventionally, heat detectors have been used in places such as kitchens that are directly exposed to steam and smoke from cooking.
As this heat sensor, for example, the one shown in FIG. 5 is known.

In FIG. 5, reference numeral 1 denotes a sensor body made of a resin mold, and a heat-sensing part 3 equipped with a heat-sensitive plate 2 is attached to the center of the lower part of the sensor body 1, and the heat-sensing part is protected by mounting a guard 4. ing. A member such as a bimetal is incorporated in the heat sensitive section 3, which is reversed at the fire detection temperature and closes the switch contact.

A circuit housing part 5 is formed on the back of the heat sensitive part 3, and a circuit board is mounted inside the circuit housing part 5. 7. is incorporated, and the lid 9 is fixed with screws through the gasket 8, thereby creating a waterproof structure that prevents moisture from entering from the outside.

An indicator light 10 using an LED or the like is connected to the circuit board 7 provided in the circuit storage part 5 and is lit when a fire is detected to indicate an alarm to the outside. The tip of the lamp storage part 11 is made to protrude downward from the hole, and the inside is filled with an adhesive 12 and sealed.

In addition, as another conventional example of waterproof mounting of the indicator light 10,
As shown in FIG. 6, the lower side of the sensor main body 1 in the circuit housing part 5 is made thinner and protrudes to form an indicator light housing part 13, and the indicator light 10 is placed in this indicator light housing part 13. The internal indicator light 1 is inserted through the built-in, thin-walled indicator light housing section 13.
The lighting of 0 is made visible from the outside, eliminating the need for a special waterproof structure.

[Problems to be Solved by the Invention] However, the following problem exists in the waterproof built-in structure of the alarm indicator light in such a conventional heat sensor.

In the structure shown in Figure 5, which seals by filling with adhesive, it takes time for the adhesive to harden, resulting in long downtime during assembly, and the adhesive leaking outside, resulting in poor results. There is a problem in which sufficient care must be taken when filling the adhesive.

On the other hand, in the structure shown in Figure 6 where the sensor body is made thin and an indicator light is incorporated inside, the sensor body does not use a translucent resin material, so even if the sensor body is thin, it cannot be easily seen from the outside. There is a problem that the brightness when viewing is insufficient and the alarm display is difficult to understand.

The present invention has been made in view of these conventional problems, and is a heat sensing device that can indicate an alarm using an indicator lamp that is sealed inside the display window without requiring any special assembly. The purpose is to provide equipment.

[Means for Solving the Problems] First, the present invention includes a heat sensing section that detects heat caused by a fire and outputs a fire detection signal within a sensor body, and a fire detection signal from the heat sensing section that is transmitted through a transmission path. a circuit section that sends the signal to the receiver; a circuit storage section that stores the circuit section in a state of isolation from the outside by attaching a lid with a waterproof structure; The target is a heat detector equipped with an indicator light that displays an alarm.

In the invention of claim 1 regarding such a heat sensor,
Insert-molding a display window member made of a pre-molded transparent or semi-transparent material into a part of the sensor body facing the indicator light provided in the circuit storage part when molding the sensor body. Further, an annular flange is formed around the periphery of the portion of the display window member that is embedded within the main body of the display window member.

Furthermore, in the heat sensor according to the present invention as set forth in claim 2,
A prism section made of a transparent or semi-transparent material is formed in advance on a part of the main body facing the indicator light provided in the circuit storage section, and a guide for positioning the indicator light in a direction perpendicular to the incident surface of the prism section. A display window member integrally equipped with a display window member is integrated by insert molding when molding a sensor main body, and an annular flange is added to the periphery of a portion of the guide portion of the display window member that is embedded in the main body. It is designed to form a

[Function] In the heat sensor of the present invention having such a configuration,
Since the display window member made of transparent or translucent material is integrally produced by insert molding of the display window member during molding of the main body, an indicator light is placed inside opposite to the position where the display window is formed. It is only necessary to incorporate the indicator light, and there is no need for a special waterproof structure or adhesive filling, and work efficiency can be greatly improved.

In addition, since the flange protrudes around the part of the display window component that is embedded within the main body, the boundary dimension of the contact area between the main body and the display window component can be lengthened, and the boundary between different resin materials can be penetrated. It can reliably prevent moisture from entering.

Furthermore, by insert-molding the display window member with a prism structure, the indicator light, which was conventionally installed facing downwards, can be installed horizontally, and by being able to place the indicator light horizontally, the height direction of the circuit storage area can be increased. The size of the can be reduced.

[Embodiment] Fig. '1 is a cross-sectional view showing the configuration of an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a sensor body, and a heat-sensitive section 3 having a heat-sensitive plate 2 is incorporated in a protruding position at the lower center of the a-sensor body 1, which is produced by molding resin. incorporates a heat-sensitive actuating member such as a bimetal that reverses itself at the fire detection temperature and closes the switch contact. Further, a protective guard 4 is provided to cover the periphery and underside of the heat sensitive section 3.

A circuit housing part 5 is formed in the sensor main body 1 behind the heat sensing part 3, and a fire detection signal from the heat sensing part 3 is sent to the receiver via a signal line 6 inside the circuit housing part 5. A circuit board 7 on which a circuit section is mounted is incorporated. The circuit storage part 5 is made waterproof by screwing a lid 9 through a gasket 8 with a circuit board 7 installed therein. Also,
By integrally molding the signal wire 6 when molding the lid 9, the extended portion of the signal wire 6 is also made waterproof.

The structure of such a heat sensor is the same as the conventional one, but in addition to this, in the present invention, there is a light at a lower position around the heat sensing part 3 in the sensor body 1, which lights up when a fire is detected. An indicator light 10 using an LED or the like is provided to display an alarm. In the present invention, the indicator light 10 is incorporated into the indicator window member 14, and the indicator window member 14 is embedded and integrated by insert molding when the sensor main body 1 is molded.

That is, the display window member 14 is molded in advance using a resin mold of a transparent material or a translucent material, and when molding the sensor body 1, the display window member 14 that has been molded in advance is set in the mold and then molded. So-called insert molding is performed.

FIG. 2 is an enlarged cross-sectional view of the molded portion of the display window member 14 shown in FIG.

In FIG. 2, the display window member 14 has an inwardly opened cylindrical hole 15 for accommodating the indicator light 10, and further includes a sensor main body 1.
An annular flange 16 is formed on the outer periphery of the cylindrical portion to be embedded in the sensor body 1, and insert molding is performed so that the flange 16 is embedded within the sensor body 1.

In the built-in structure of the indicator light 10 for displaying an alarm as shown in the embodiment shown in FIGS. Since the display window member 14 is integrated by insert molding when the sensor body 1 is molded, special work is required to assemble the display window member 14 to the sensor body 1 during assembly, and to seal it later by filling with adhesive or the like. First, it is possible to improve work efficiency.

Moreover, since the display window member 14 is integrated with the sensor main body 1 by insert molding, the waterproof structure from the part where the display window member 14 is incorporated into the circuit housing portion 5 can be guaranteed to be highly reliable. In particular, as shown in an enlarged view in FIG.
Because it extends in an annular shape, the length of the boundary between the two from the inside to the outside is lengthened by the flange 16, and even if moisture tries to enter the inside through the very small gap that occurs at the boundary between the two, the boundary distance Since the display window member 14 is long, it is possible to reliably prevent the intrusion of moisture, and the formation of the flange portion 16 also ensures the strength of the attachment of the display window member 14 to the sensor main body 1.

FIG. 3 is a cross-sectional configuration diagram of another embodiment of the present invention, and this embodiment is characterized in that the indicator light can be installed laterally within the circuit housing.

In FIG. 3, a sensor main body 1, a heat sensitive part 3 including a heat sensitive plate 2, a guard 4, a circuit storage part 5, a signal line 6, a circuit board 7 are shown.
, the packing 8 is the same as the embodiment shown in FIG. 1, but an indicator light 10 is provided horizontally in the circuit housing 5, and in order to enable the indicator light 10 to be installed horizontally, The display window member 18, which has a structure that can be taken out and shown, is integrated by insert molding when the sensor main body 1 is molded.

In FIG. 3, the display window member 18 has a triangular prism-shaped prism part 20, and a guide part 22 extends in a direction perpendicular to the entrance surface 21 of the prism part 20. The indicator light 10 is positioned with respect to 21.

Furthermore, a ring-shaped flange 24 is formed at the periphery of the portion of the guide portion 22 that is embedded within the sensor main body 1 .

The display window member 18 shown in FIG. 3 is pre-molded using a transparent material or a semi-transparent material, and when the sensor body 1 shown in FIG. 3 is molded, the display window member 18 shown in FIG.
are set in a mold and integrated by insert molding, and in this insert molding, the flange 24 formed around the guide part 22 is embedded in the sensor main body 1, and is inserted from the outside through the boundary between the two. The distance between the two surfaces is increased to prevent moisture from entering through the gaps at the interface.

In the heat sensor having the structure shown in FIGS. 3 and 4, the display window member 18 shown in FIG. 4 is integrated with the sensor body 1 by insert molding, so there is no need to assemble the display window. At the same time, the flange portion 24 of the display window member 18 can reliably prevent moisture from entering from the boundary between different resin materials formed by insert molding.

Furthermore, in the embodiment shown in FIG. 3, by arranging the indicator light 10 connected to the circuit board 7 on the guide part 22 horizontally, the light from the lighting of the indicator light 10 is transmitted to the prism part 20. Since the light can be irradiated downward at a right angle and the indicator light 10 can be placed sideways, the height dimension of the circuit storage section 5 can be reduced, thereby reducing the size of the entire heat sensor. I can do it.

In the embodiment shown in FIG. 3, the signal line 6 is inserted into the lid 9 and sealed by filling with adhesive, but as in the embodiment shown in FIG. Of course, it is also possible to use an integrally molded sealed structure.

[Effects of the Invention] As explained above, according to the present invention, since the display window member is integrated by insert molding when molding the sensor body, the display window can be attached during assembly or filled with adhesive. No special work such as sealing is required, and assembly efficiency can be greatly improved.

In addition, since the display window member has an annular flange formed in the part that is embedded in the sensor body, the boundary distance where different resins come into contact can be lengthened by insert molding. By forming this part, it is possible to reliably prevent moisture from penetrating through the boundary gap from entering the inside.

Furthermore, by using a prism structure as the display window member, the display light can be placed horizontally within the circuit housing.

By making it possible to reduce the height of the circuit housing portion, it is possible to reduce the size of the heat sensor as a whole.

[Brief explanation of drawings]

Fig. 1 is an embodiment configuration diagram showing one embodiment of the present invention; Fig. 2
The figure is an enlarged cross-sectional view of the insert molded part of the display window in Figure 1. Figure 3 is an embodiment configuration diagram showing another embodiment of the present invention. Figure 4 is an explanation of the display window member used in Figure 3. Figure: 5th and 6th
The figure is an explanatory diagram of a conventional example. 1 Sensor main body 2, heat sensitive plate 3, heat sensitive part 4 Ni guard 5: circuit storage part 6, signal line 7, circuit board 8° packing 9: M 10: indicator light 14.18: display window member 15: cylindrical hole 1- 6.24: Flange section 20 Nibrism section 21: Entrance surface 22 Ni guide section Fig. 1

Claims (1)

[Scope of Claims] 1. The sensor body includes a heat-sensing section that detects heat caused by a fire and outputs a fire detection signal, and a circuit that sends the fire detection signal from the heat-sensing section to a receiver via a transmission path. a circuit storage section in which the circuit section is isolated from the outside by being fitted with a lid having a waterproof structure; and an indicator light built into the circuit storage section that lights up when a fire is detected to indicate an alarm to the outside. In the heat sensor, a display window member made of a pre-formed transparent or semi-transparent material is provided in a part of the main body facing the indicator light provided in the circuit storage part. A heat sensor characterized in that the display window member is integrated by insert molding during molding, and further includes an annular flange formed on the periphery of the display window member that is embedded within the main body of the display window member. 2. The sensor body has a heat sensing part that senses the heat caused by a fire and outputs a fire detection signal, a circuit part that sends the fire detection signal from the heat sensing part to the receiver via a transmission path, and a waterproof structure. A heat sensing device comprising: a circuit storage part that stores the circuit part in a state of isolation from the outside by attaching a lid thereon; and an indicator light that is built into the circuit storage part and lights up when a fire is detected to indicate an alarm to the outside. In the device, a prism part made of a transparent or semi-transparent material formed in advance is provided on a part of the main body facing the indicator light provided in the circuit storage part, and a direction perpendicular to the incidence plane of the prism part. A display window member integrally provided with a guide portion for positioning the indicator light is integrated by insert molding when molding the main body, and is further embedded in the main body of the guide portion of the display window member. A heat sensor characterized by forming an annular flange around the periphery.