JP2001266265A - Heat and smoke combined type detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat and smoke combined type detector which is easily assembled when it is manufactured and where wiring can be performed so as not to affect detection sensitivity and directivity as far as possible. SOLUTION: In this heat and smoke combined type detector 1 which is provided with a smoke detection chamber S inside a labyrinth body 4 and where smoke is detected in such a manner that a light receiving part 13 receives the scattered light of light emitted from a light emitting part 12 and senses heat by a thermistor 10 installed at the upper part of the chamber S, the chamber S is provided with a light shielding plate 14 which is composed of a wall body continuing almost to the upper and lower faces of the inside of the smoke detection chamber and has a through hole 14a through which the lead wire of the thermistor 10 can be passed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined smoke and smoke detector for detecting a fire by smoke and heat.

[0002]

2. Description of the Related Art Conventionally, a hot-smoke combined fire detector that senses heat by a heat-sensitive element such as a thermistor and detects smoke by receiving scattered light of light emitted from a light-emitting element by a light-receiving element. It has been known. In such a hot-smoke combined sensor, the heat-sensitive element needs to be arranged at the top of the sensor (the lower side when installed on the ceiling) in order to detect the rising airflow when a fire occurs with high sensitivity. On the other hand, since the circuit board for performing signal processing of the sensor is provided below the sensor (or above when installed on the ceiling), wiring for connecting the thermosensitive element and the circuit board is required.

[0003]

By the way, since a smoke sensing area where the optical axis of the light emitting element and the optical axis of the light receiving element intersect is formed between the top of the sensor and the circuit board, avoid this area. It is better to pass the wiring to the thermal element. For example, Japanese Patent Application Laid-Open No. Hei 4-26897 discloses that a through hole is formed in a labyrinth portion provided around a smoke sensing area to pass wiring. However, if such a wiring structure is adopted, it takes much time for assembling at the time of manufacturing and removing and assembling at the time of maintenance after installation. A method of arranging the wiring outside the sensor has been proposed, but is not appropriate for the same reason.

Therefore, Japanese Patent Application Laid-Open Nos. 10-40476 and 11-185179 disclose a type in which wiring is passed through the inside of the sensor while avoiding the smoke sensing area. However, when the wiring passes through the inside in this way, reflected light generated on the surface of the wiring becomes noise light and is received by the light receiving element, and the smoke detection sensitivity is reduced. In particular, the surface shape of the wiring that covers the metal wire with soft resin is slightly different for each product, and the amount of noise light generated for each wiring is also different, so the detection sensitivity varies for each sensor. was there. In addition, when wiring is arranged so as to avoid the smoke sensing area as in these publications, there is a problem in that a specific direction is generated with respect to the sensitivity of heat sensing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot smoke composite type sensor which is easy to assemble at the time of manufacture and detachment / assembly at the time of maintenance, and which can be wired so as not to affect detection sensitivity and directionality as much as possible. To provide.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 uses, for example, as shown in FIG. 1, scattered light of light emitted from a light emitting section (12) as a light receiving section. A combined smoke and smoke detector having a smoke sensing chamber (S) for sensing smoke by receiving light from (13) and a heat sensitive element (thermistor 10) for sensing heat above the smoke sensing chamber. (Sensor 1) In the smoke sensing chamber, the smoke sensing chamber is formed of a wall substantially continuous with the upper surface and the lower surface of the inside of the smoke sensing chamber, and wiring (lead wire 10a) of a thermosensitive element (thermistor 10) can be inserted therethrough. Holes communicating with the outside of the smoke sensing chamber on the upper surface and the lower surface (through holes 14a)
Is provided.

According to the first aspect of the present invention, the upper and lower surfaces of the interior of the smoke sensing chamber are substantially continuous with each other, and the wiring of the thermosensitive element can be inserted therein. By passing the wiring of the thermosensitive element through the insertion portion having a hole communicating with the outside of the device, the wiring can be passed through the interior of the smoke sensing chamber while being covered by the insertion portion. Therefore, when assembling, the wiring of the thermal element only needs to be passed through the insertion section, and this insertion section also serves as a guide for mounting and positioning of the thermal element, making it easy to assemble during manufacturing and removal and assembly during maintenance. become. In addition, since the wiring is not exposed inside the smoke sensing chamber, no noise light is generated from the wiring surface, the amount of noise light does not vary for each product, and the detection performance for each product is stabilized. Further, even if light is reflected on the surface of the insertion portion and becomes noise light, if the insertion portion is formed of, for example, a hard resin, there is no problem because the surface shape variation such as wiring is small. Here, "above the smoke sensing room" means on the top side of the smoke sensing room, that is, below the ceiling when installed on the ceiling. In addition, "a wall that is substantially continuous with the upper surface and the lower surface of the smoke sensing chamber" does not necessarily mean that the upper surface and the lower surface of the smoke sensing chamber are completely continuous with each other. Then, it is sufficient that the noise light is not generated.

According to a second aspect of the present invention, there is provided the hot-smoke combined type sensor according to the first aspect, wherein a light-shielding plate is provided in the smoke sensing chamber to block light from the light-emitting portion to the light-receiving portion. The insertion portion utilizes at least a part of the light shielding plate.

According to the second aspect of the present invention, since the insertion portion through which the wiring of the thermal element is passed uses at least a part of the light shielding plate, the insertion portion is located near the center of the interior of the smoke sensing chamber. And it is possible to prevent a specific directionality from being generated with respect to the sensitivity of the thermal element, and to perform detection with uniform sensitivity in all directions.

Here, "use at least a part" means
A part of the light shielding plate may be used as a wall and used as an insertion portion.
Alternatively, as in the third aspect of the invention, the light shielding plate itself may be formed in a tubular shape and used as the insertion portion. According to the third aspect of the present invention, the number of components does not increase because the light shielding plate provided in the conventional sensor is used.

According to a fourth aspect of the present invention, there is provided the hot smoke composite type sensor according to any one of the first to third aspects, wherein a fixing member (support 11) to which the light emitting portion and the light receiving portion are fixed, A box body (labyrinth body 4) having a structure in which outside light does not enter from the side surface and only one of the upper surface and the lower surface is opened, and is fixed to the fixing member from one open side of the box body; The light emitting part and the light receiving part face the inside of the box, the inside of the box serves as a smoke sensing chamber, and the wall forming the insertion part is formed integrally with the fixing member.

According to the fourth aspect of the present invention, since the insertion portion is formed integrally with the fixing member, the assembly is further facilitated, and there is no gap between the insertion portion and the fixing member. Therefore, the structure is such that external light is hard to enter.

The invention described in claim 5 is the first invention.
4. The fixing member (support 11) in which the light emitting unit and the light receiving unit are fixed in the combined heat and smoke sensor according to any one of (1) to (3).
And a box (labyrinth body 4) having a structure in which external light does not enter from the side surface and only one of the upper surface and the lower surface is open. The fixed light-emitting part and light-receiving part face the inside of the box, the inside of the box is a smoke sensing room, and the wall forming the insertion part is integrated with the surface opposite to the open side of the box. It is characterized by being molded.

According to the fifth aspect of the present invention, since the insertion portion is integrally formed on one surface side of the box, the assembling is further facilitated, and the insertion portion is further provided between the insertion portion and the box. Since there is no gap, the structure is such that external light is hard to enter. In Claims 4 and 5, the "structure through which external light does not enter" includes a well-known labyrinth structure and the like, but other structures may be used.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows each member constituting a sensor 1 as an example of a combined heat and smoke sensor of the present invention, and FIG. 2 is a longitudinal sectional view when each member of FIG. 1 is assembled. 1 and 2, 2
Is a lid, 3 is a main body case, 4 is a labyrinth body, 5 is an insect-proof mesh, 6 is a shield case, 7 is an optical element, 8 is a circuit board, 9 is a base, and 10 is a thermistor. FIG. 3 is a cross-sectional view showing the inside of the labyrinth body 4.

The cover 2 is a cover that covers the top of the sensor 1. The outside air fins 2a, 2a,... In addition, the adjacent open air fin 2
are provided between the communication holes a, and the thermistor 10 faces the space surrounded by the communication holes 2b, 2b,... as shown in FIG. ing. As shown in FIG. 2, the cover 2 has a ring-shaped contact portion 2 c that substantially contacts the inside of the protrusion 3 b formed on the main body case 3. The lid part 2 is a contact part 2
c is fitted around the protruding portion 3b, and a not-shown claw is locked at a predetermined position of the main body case.
To be fixed.

The main body case 3 is a housing that covers the labyrinth body 4 and the like, and has an opening 3a formed in the center thereof.
Is provided so as to surround the periphery of. Further, the main body case 3 is provided with inflow holes 3c, 3c,... Formed along the circumferential direction so that smoke can flow. As shown in FIG. 2, a plurality of locking claws 3 f for fixing to the base 9 are provided at a lower portion inside the main body case 3. FIG. 2 shows only one.

The labyrinth body (box) 4 is covered on one side by a disk-shaped plate 4d and has a plurality of light-shielding walls 4a having a Z-shaped or M-shaped cross section, and a light-emitting portion 12 to be described later. The storage section 4b for storing the light receiving section 13 and the storage section 4c for storing the light receiving section 13 are provided in a predetermined arrangement. In the present embodiment, the storage section 4b of the light emitting section 12
The storage section 4c of the light receiving section 13 is provided in the labyrinth body 4, but if this is provided in the shield case 6, the shielding effect for the light emitting section 12 and the light receiving section 13 can be also used. Light shielding walls 4a, 4 inside the labyrinth body 4
a and the area surrounded by the storage sections 4b and 4c become the smoke sensing room S. The thermistor 1 is located at the center of the plate 4d.
A lead hole 4e through which the zero lead wire 10a can be inserted is provided. In the labyrinth body 4, external smoke flowing from the inflow holes 3 c, 3 c,.
a, 4a... and the accommodating portions 4b, 4c are guided inside, but outside light cannot enter.

The labyrinth body 4 is covered with an insect repellent net 5 having a small mesh so that insects cannot enter the labyrinth body 4. The shield case 6 is shown in FIG.
As shown in FIG. 7, a support plate hole 6a into which the support 11 of the optical element unit 7 can be fitted is formed in the center. The shield case 6 is fixed to the base 9 by claws (not shown). As shown in FIG. 3 (not shown in FIG. 1), the upper surface of the shield case 6 has a circular restriction wall 6e and a restriction protruding from the restriction wall 6e in order to restrict the position where the labyrinth body 4 is stored. Plates 6d, 6d,
6d, 6d are provided.

The optical element section 7 includes a support plate (fixing member) 11.
And a light emitting unit 12, a light receiving unit 13, and a light shielding plate 14 provided on the support 11. The light emitting section 12 includes a light emitting element (not shown) and emits light periodically under the control of the circuit board 8. On the other hand, the light receiving section 13 has a light receiving element (not shown) and sends out a light receiving signal to the circuit board 8. The light-shielding plate 14 blocks light that goes from the light emitting unit 12 to the light receiving unit 13 directly so that light from the light emitting element of the light emitting unit 12 is not directly received by the light receiving element of the light receiving unit 13. The light-shielding plate 14 is formed integrally with the support 11 from a hard resin and has a height reaching the vicinity of the lower surface of the plate 4 d of the labyrinth body 4. The light shielding plate 14 is formed in a cylindrical shape as shown in FIGS.
Through hole 14a penetrating vertically and through which lead wire 10a can be inserted
Having. The optical element unit 7 is assembled in the sensor 1 by soldering the light emitting element of the light emitting unit 12 and the light receiving element of the light receiving unit 13 provided on the support 11 to the circuit board 8. The light emitting section 12 is a storage section 4b of the labyrinth body 4.
Meanwhile, the light receiving section 13 is stored in the storage section 4c, and the light shielding plate 14 is set upright in the smoke sensing room S of the labyrinth body 4.

The circuit board 8 has a predetermined electronic circuit (not shown) for controlling the operation of the sensor 1 formed thereon.
The light emitting element and the light receiving element are connected. Further, the lead wire 10a of the thermistor 10 is connected to the center of the upper surface of the circuit board 8. The circuit board 8 is fixed to the base 9 by screws 15 as shown in FIG.

The base 9 is formed in a disk shape as shown in FIG. 1 and constitutes a housing of a lower portion of the sensor 1. On the back side of the base 9, there is provided a locking piece which is connected to a mounting base (not shown) previously set on the ceiling surface and fixes the sensor. Also, on the periphery of the base 9,
Notches 9a of a number corresponding to locking claws 3f of main body case 3
(One is shown in FIG. 2).

As shown in FIG. 2, each of the members having the above-described structure includes a circuit board 8, an optical element section 7, and a shield case 6 disposed on a base 9, and a light emitting section protruding from the upper surface of the shield case 6. The labyrinth body 4 is placed on the shield case 6 in a state where 12 is aligned with the storage section 14b and the light receiving section 13 is stored in the storage section 14c.
The plurality of locking claws 3f of the main body case 3 are engaged with the corresponding cutouts 9a of the base 9, thereby fixing the main body case 3 to the base 9 and fixing the lid 2 to the main body case 3.
Lead wire 10 of thermistor 10 connected to circuit board 8
As for a, the thermistor 10 is assembled through the through hole 14a and the lead hole 4e of the labyrinth body 4 so that the thermistor 10 faces the heat sensing region T of the lid 2.

The sensor 1 is installed on the ceiling with the lid 2 facing downward, and the thermistor 10 in the heat sensing area T
Detects the heat generated by the fire. In addition, the light emitting unit 12 periodically emits light, is normally blocked by the light shielding plate 14 and is not received by the light receiving unit 13. When smoke is generated by the fire and enters the labyrinth body 4, the light emitted from the light emitting unit 12 is scattered and is received by the light receiving unit 13 to detect the fire. Thus, the sensor 1 detects a fire by both heat and smoke.

According to the sensor 1 described above, the lead wire 10a of the thermistor 10 is passed through the through hole 14a of the light-shielding plate 14 formed integrally with the support 11, so that the lead wire 10a
Can be passed through the interior of the smoke sensing chamber S while being covered with the light shielding plate 14. Therefore, in assembling the sensor 1,
Since the lead wire 10a is merely passed through the through-hole 14a, the work is simple, and the through-hole 14a also serves as a guide for mounting and positioning the thermistor 10, making it easy to assemble at the time of manufacturing and remove / assembly at the time of maintenance. Become. Further, since the lead wire 10a is not exposed inside the smoke sensing chamber S, no noise light is generated from the lead wire surface, the amount of noise light does not differ for each product, and the detection performance for each product is improved. Stabilize. Even if light is reflected by the surface of the light-shielding plate 14 itself and becomes noise light, since the light-shielding plate 14 is made of a hard resin, there is no problem that variation in surface shape is small and detection performance differs for each product.

Further, since the through-hole 14a uses a light-shielding plate, the lead wire 10a can be passed near the center of the smoke sensing chamber S, and a specific direction is generated with respect to the sensitivity of the thermistor 10. Without this, it is possible to detect with uniform sensitivity in all directions. Further, since the light shielding plate provided in the conventional sensor is used, the through hole 14 is used.
Even if a is provided, the number of parts does not increase.

Further, since the light-shielding plate 14 is formed integrally with the support 11, the assembling is further facilitated, and there is no gap between the support 11 and the light-shielding plate 14 so that external light can enter. There is no.

The hot-smoke combined sensor of the present invention is not limited to the above-described embodiment, and the specific structure, shape and the like can be changed as appropriate. For example, the light-shielding plate is formed of a labyrinth plate. They may be formed integrally.

[0029]

According to the first aspect of the present invention, the smoke sensing chamber comprises a wall substantially continuous with the upper surface and the lower surface,
By passing the wiring of the heat-sensitive element through an insertion part through which the wiring of the heat-sensitive element can be inserted and having holes communicating with the outside of the smoke sensing chamber on the upper surface and the lower surface, the smoke detection is performed in a state covered by the insertion part. Wiring can be passed inside the room.
Therefore, when assembling, the wiring of the thermal element only needs to be passed through the insertion section, and this insertion section also serves as a guide for mounting and positioning of the thermal element, making it easy to assemble during manufacturing and removal and assembly during maintenance. become. In addition, since the wiring is not exposed inside the smoke sensing room, no noise light is generated from the wiring surface,
There is no difference in the amount of noise light for each product, and the detection performance for each product is stable. Further, even if light is reflected on the surface of the insertion portion and becomes noise light, if the insertion portion is formed of, for example, a hard resin, there is no problem because the surface shape variation such as wiring is small.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, since the insertion portion for passing the wiring of the heat-sensitive element utilizes at least a part of the light-shielding plate, the insertion portion may be provided near the center of the smoke sensing chamber. As a result, it is possible to prevent a specific directionality from occurring with respect to the sensitivity of the thermal element, and to detect the thermal element with uniform sensitivity in all directions.

According to the invention of claim 3, according to claim 2,
In addition to the effects of the invention described in (1), since the light shielding plate provided in the conventional sensor is used, the number of parts does not increase.

According to the fourth aspect of the present invention, since the insertion portion is formed integrally with the fixing member, the assembly is further facilitated, and there is no gap between the insertion portion and the fixing member. Therefore, the structure is such that external light is hard to enter. According to the invention as set forth in claim 5, since the insertion portion is formed integrally with the box, the assembly is further facilitated, and since there is no gap between the insertion portion and the box, the insertion portion is formed outside. The structure makes it difficult for light to enter.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a sensor as an example of a combined heat and smoke sensor according to the present invention.

FIG. 2 is a vertical cross-sectional view when the members of FIG. 1 are combined.

FIG. 3 is a cross-sectional view showing the inside of the labyrinth body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detector (Hot smoke combined sensor) 2 Lid 3 Body case 4 Labyrinth body (box) 4d plate 5 Insect net 6 Shield case 7 Optical element part 8 Circuit board 9 Base 10 Thermistor (Thermal element) 10a Lead wire (Wiring) 11 Support (fixing member) 12 Light emitting unit 13 Light receiving unit 14 Light shielding plate 14a Through hole

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasunori Oya 1-11-6 Hatagaya, Shibuya-ku, Tokyo F-term in Nittan Co., Ltd. (reference) 5C085 AA01 AA03 AB01 BA12 BA33 CA08 CA30 FA10 FA11 FA20

Claims (5)

[Claims] A smoke sensing chamber for sensing smoke by a light receiving section receiving scattered light of light emitted from the light emitting section; and a heat sensitive element sensing heat above the smoke sensing chamber. In the thermal smoke combined type detector, the smoke sensing room is formed of a wall substantially continuous with the upper surface and the lower surface of the inside of the smoke sensing room, and the wiring of the heat-sensitive element can be inserted therethrough, and the upper surface and the lower surface are A hot-smoke combined sensor, wherein an insertion portion having a hole communicating with the outside of the smoke detection chamber is provided. 2. A light-shielding plate is provided in the interior of the smoke sensing chamber for blocking light from the light-emitting unit to the light-receiving unit, and the insertion unit uses at least a part of the light-shielding plate. The hot smoke combined sensor according to claim 1. 3. The combined heat and smoke detector according to claim 2, wherein the light shielding plate is formed in a cylindrical shape, and the light shielding plate is used as an insertion portion. 4. A fixing member having a light-emitting portion and a light-receiving portion fixed thereto, and a box having a structure in which external light does not enter from a side surface and having only one of an upper surface and a lower surface opened. The light-emitting part and the light-receiving part fixed to the fixing member from one open side of the box face the inside of the box, the inside of the box serves as a smoke sensing chamber, and the wall forming the insertion part is a fixing member. The combined hot-smoke sensor according to any one of claims 1 to 3, wherein the sensor is integrally formed. 5. A fixing member having a light-emitting portion and a light-receiving portion fixed thereto, and a box having a structure in which external light does not enter from a side surface and having only one of an upper surface and a lower surface opened. The light-emitting part and the light-receiving part fixed to the fixing member from one open side of the box face the inside of the box, the inside of the box serves as a smoke sensing chamber, and the wall forming the insertion part is a box. 2. An integral molding on a surface opposite to the open surface.
4. The combined heat and smoke detector according to any one of items 1 to 3.