JPH0716236Y2 - Conductive structure of compound fire detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a combined sensor for detecting smoke and heat, and more particularly, when an outer cover is fitted to a sensor body having a smoke detector. The present invention relates to a conducting structure of a composite type sensor in which a heat sensing portion provided on the outer cover side is brought into conductive contact with a sensor body side.

[Prior Art] Conventionally, as a composite sensor of this type, for example, that shown in FIG. 8 is known.

In FIG. 8, 1 is a sensor body, and the sensor body 1
A smoke detection chamber 2 is formed in which smoke from the outside can flow.
A smoke detector (not shown) using, for example, a scattered light type smoke detection mechanism is built in the smoke detection chamber 2.

On the other hand, a detachable outer cover 3 is provided for the sensor body 1, and a smoke inlet 4 is provided around the outer cover 3.

Further, a mounting hole 5 is formed at the center of the bottom 3a on the tip side of the outer cover 3, and the heat sensing unit 6 is mounted in the mounting hole 5 with the heat sensitive plate 7 exposed to the outside.

Here, since the smoke detector (not shown) and the detector circuit for the heat detector 6 are built in the detector main body 1, the heat detector 6 and the detector main body 1 provided on the detachable outer cover 3 are attached.
It is necessary to provide a separable conductive structure between and.

As such a conducting structure, conventionally, a conducting metal fitting 8 is provided so as to penetrate the smoke detecting chamber 2 of the sensor body 1, and one end of the conducting metal fitting 8 is connected to a conducting terminal 9 of the heat sensing portion 6 by soldering or the like. , The tip of the conducting metal fitting 8 through which the smoke detection chamber 2 is inserted is bent in an arc shape to form the pressing portion 10, while the terminal screw is provided on the side of the sensor body 10 facing the pressing portion 10 of the connecting metal fitting 8. 11 is attached, and when the smoke detection chamber 2 is assembled to the sensor main body 1, the pressing portion 10 of the conductive metal fitting 8 is pressed and brought into contact with the head of the terminal screw 11 of the sensor main body 1 as shown in the figure.

[Problems to be Solved by the Invention] However, the conventional conductive structure of the composite sensor has the following problems.

First, since the conduction metal fitting 8 is provided so as to fit through the smoke detection chamber 2, a part of the smoke inlet to the smoke detection chamber 2 is blocked by the penetration of the conduction metal fitting 8 and the smoke sensing function is hindered. There is a problem.

Secondly, since the metal fitting 8 penetrates the smoke detection chamber 2, the conventional smoke detector structure cannot be used as it is, and the composite smoke detector chamber structure is separately prepared. There is a problem that the smoke detector cannot be shared.

Thirdly, since the conducting metal fitting 8 must be incorporated at the same time as assembling the smoke detection chamber 2 with respect to the sensor body 1, the assembly is complicated and the workability is poor, and especially the conducting metal fitting 8 for the terminal screw 11 of the sensor body 1 is installed. Since it is difficult to confirm the contact state from the outside, it is first known that there is a contact failure at the time of an operation test after the assembly is completed, and there is a problem that the product yield decreases.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a highly reliable conductive structure of a composite sensor that is easy to assemble and can reliably make conductive contact. To do.

[Means for Solving the Problems] First, the present invention includes a sensor body having a smoke sensing portion, an outer cover having a smoke inlet around the sensor body, the outer cover being fitted to the sensor body.
A composite sensor having a heat sensing unit mounted on the bottom of the outer cover exposed to the outside so as to sense smoke and heat by the smoke sensing unit and the heat sensing unit.

Regarding such a composite type sensor, in the conduction structure of the present invention, the conduction metal fitting is fixed to the inner side of the bottom end of the outer cover, and one end of the conduction metal fitting is connected to the conduction terminal of the heat sensing portion, The other end of the conductive metal fitting extends along the inner wall of the cover outside the smoke inlet of the outer cover toward the sensor main body side, and a bifurcated contact sandwiching piece having a spring property is formed at the tip, and further conduction The head of the terminal member is exposed and fixed at the position of the sensor body facing the contact sandwiching piece formed at the tip of the metal fitting, and the contact sandwiching piece of the conductive metal fitting is used when the outer cover is fitted to the sensor body. The head portion of the terminal member of the sensor body is tightly attached so as to make conductive contact.

[Operation] In the conducting structure of the composite type sensor according to the present invention having such a configuration, the conducting metal fitting does not penetrate the smoke detecting chamber of the sensor body, and the smoke inlet is provided in the outer cover. Since it extends along the inner wall of the cover that is disengaged, it does not hinder the inflow of smoke into the smoke detection chamber and does not adversely affect the smoke sensing function.

Also, since the conducting metal fittings are fixed to the outer cover side, the complicated assembly work of assembling the conducting metal fittings at the same time when assembling the sensor body is not necessary, and furthermore, when assembling the conducting metal fittings to the outer cover, the conducting member must be assembled. Since there are no other members to interfere, the assembly of the conducting fitting can be done very easily.

Furthermore, since the contact member has a contact structure in which the tip of the conductive metal fitting inserts the terminal member of the sensor main body with springiness, the electrical connection between the heat sensing unit and the sensor main body can be performed more reliably.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of the present invention.

In FIG. 1, an outer cover 3 having a smoke inlet around it is fitted to the lower portion of the sensor body 1 as shown in FIG.

The sensor main body 1 has a circuit housing portion 13 which houses a printed circuit board 12 therein, and a smoke sensing portion 14 is mounted below the printed circuit board 12 provided in the circuit housing portion 13.

As is apparent from the separated state of FIG. 3, the outer cover 3 fitted to the sensor main body 1 has the heat sensing portion 6 mounted in the mounting hole 5 formed in the center of the outer cover 3 on the tip bottom 3a side. A heat-sensitive plate 7 is exposed to the outside on the lower side of the heat sensing unit 6 and is integrally formed at the tip.

A pair of conducting metal fittings 15 are provided inside the bottom 3a on the tip side of the outer cover 3.
Are fixed by screws 16. One end of the conductive fitting 15 is connected to the conductive terminals 9 which are taken out on both sides of the upper end of the heat sensing portion 6, and the other end of the conductive fitting 15 is located along the inner wall 17 of the cover 3 which is outside the smoke inlet of the outer cover 3. Has been extended to the side. The tip of the conducting metal fitting 15 extending to the sensor body 1 side along the cover inner wall 17 of the outer cover 3 has a bifurcated spring-like contact sandwiching piece as will be made clear later. Forming eighteen.

On the other hand, a pair of terminal screws 20 are mounted as terminal members on the side of the sensor body 1 opposite to the contact sandwiching piece 18 formed at the tip of the conductive fitting 15 fixed to the outer cover 3 side. As is apparent from FIG. 1, the terminal screw 20 is a fitting fitting provided on the upper portion of the sensor main body 1, that is, on the rear side opening.
The fitting fitting 21 is screwed to the fitting body 21 and is fitted by turning the fitting body 1 into the fitting receiving fitting provided on the detector base fixed to the ceiling surface (not shown). It is electrically and mechanically coupled.

In the fitted state of the outer cover 3 to the sensor body 1 shown in FIG. 1, the contact sandwiching piece 18 formed at the front end of the conductive fitting 15 provided on the outer cover 3 side is provided on the sensor body 1 side. The terminal screw 20 is inserted so that the head of the
The heat sensing unit 6 provided in the
Conductive connection to the side.

FIG. 3 is an exploded view of the sensor body 1 shown in FIGS.

In FIG. 3, the sensor body 1 has a body cover 22,
A shield case (23) is incorporated in a circuit housing portion (13) opened on the lower side of a main body cover (22), and then a smoke sensing portion (14) integrated with a printed circuit board (12) is incorporated. A light emitting element 27 and a light receiving element 25 which form a scattered light type smoke detection mechanism are incorporated in the smoke sensing unit 14. Since this smoke detection mechanism is a scattered light method,
The light receiving element 25 is arranged at a position that does not directly oppose the light emitting element 27. A shield case 26 is attached to the light receiving element 25, and a test light emitting element 24 is incorporated at a position directly opposed to the light receiving element 25. Further, an insect screen 28 is mounted around the smoke detecting chamber in which the light emitting element 27, the light receiving element 25, and the test light emitting element 24 are incorporated, and further, an alarm indicator light 29 is incorporated outside the insect net 28 as needed.

A bottom lid 30 is fitted to the lower opening of the smoke sensing portion 14, and the fitting of the bottom lid 30 blocks the incidence of light from the outside into the smoke sensing portion 14, and It forms a smoke detection chamber that allows the inflow of smoke.

The shield case 23, the printed circuit board 12, and the smoke sensing part 14 fitted with the bottom cover 30 are respectively provided with terminal screws for conducting connection.
The sensor main body 1 is constructed by being screwed into the fitting metal fitting 21 provided on the back side of the main body cover 22 by 20 and incorporated into the main body cover 22.

FIG. 4 is an exploded view of the outer cover 3 side shown in FIGS.

In FIG. 4, the outer cover 3 has a smoke inlet 32 around it, and a mounting hole 5 is opened at the center of the tip-side bottom portion 3a. The heat sensing portion 6 is provided at two places of the mounting hole 5. A rectangular hole 33 for inserting the conductive terminal 9 is formed. A pair of conductive metal fittings 15 are incorporated inside the outer cover 3, and one end of the conductive metal fitting 15 which is a horizontal portion is connected to the conductive terminal 9 of the heat sensing portion 6 mounted from the lower side in the mounting hole 5 of the outer cover 3. Connected.

FIG. 5 is a plan view of the outer cover 4 shown in FIG. 4, and the smoke inlets 32 are opened at eight locations around the outer cover 4 in this embodiment, and the bottom 3a on the tip side is shown. A mounting hole 5 for fitting the heat sensing portion 6 is formed in the center of the, and a screw hole 35 for fixing the conduction fitting 15 with a screw is provided at a position outside the smoke inlet 32 on both sides of the mounting hole 5. The provided pedestal 36 is integrally formed. Further, at a position orthogonal to the formation direction of the pedestal 36, L is erected from the bottom 3a on the tip end side so as to cover the mounting hole 5.
A pair of pressing portions 37 bent and formed in a V shape are integrally formed, and a pair of support walls 38 are erected around the opening of the mounting hole 5.

Therefore, when the conduction terminal 9 of the heat sensing portion 6 is aligned and pushed into the rectangular hole 33 formed in the mounting hole 5, and after the pushing, the conduction terminal 9 is rotated so as to be aligned with the pedestal 36, the conduction terminal 9 is fixed to the support wall 38. The heat sensing portion 6 can be assembled to the outer cover 3 by riding on the upper portion and pressing the upper portion of the heat sensing portion 6 with the support portion 37.

FIG. 6 shows the conducting metal fitting 15 fixed to the outer cover 3 side shown in FIGS. 1 and 2 by screws 16 and is shown in FIG. 6 (a), a front view and FIG. 6 (b). A side view seen from the center side is shown in FIG.

As is clear from FIG. 6, the conductive fitting 15 has a through hole 39 for the screw 16 in the horizontal portion, and a fitting projection for fitting in the mounting hole of the conductive terminal 9 of the heat sensing portion 6 at the end of the horizontal portion. 40 is bent downward and integrally provided, and the tip of the portion extending from the horizontal portion to the sensor body side along the inner wall of the cover is divided into two forks, and a pair of contact sandwiching pieces 18 having spring properties are provided. Is formed.

FIG. 7 shows the conducting contact structure between the conducting metal fitting 15 mounted on the outer cover 3 side and the terminal screw 20 mounted on the sensor body 1 side, showing the outer cover 3 on the sensor body 1. By fitting, the contact sandwiching piece 18 formed at the tip of the conductive fitting 15 and divided into two forks is fitted so as to sandwich the head of the terminal screw 20 by the spring property, and a conductive connection is made.

Next, the operation of the above embodiment will be described.

First, the sensor main body 1 and the outer cover 3 are assembled as shown in the exploded view of FIGS. 3 and 4.
And the outer cover 3 side can be individually performed.

Further, on the side of the sensor body 1 shown in FIG. 3, since it is not necessary to penetrate the conduction fitting 15 into the smoke detecting chamber of the smoke detecting portion 14, a composite having the heat detecting portion 6 on the outer cover 3 side is provided. Even if it is a type sensor, it is possible to use the smoke-dedicated sensor structure as it is for the smoke sensing unit 14 on the sensor body 1 side. Even if it is a composite type by adding a heat sensing unit, the smoke sensing unit 14 That is, it is not necessary to change the structure of the sensor body 1 side, and the sensor body 1 can be shared even if it is dedicated to smoke or a combined type that senses smoke and heat.

On the other hand, as for the outer cover 3 side shown in FIG.
Since it is only necessary to fix the conduction fitting 15 to the inside of the outer cover 3 with the screw 16 after assembling the heat sensing portion 6 into the mounting hole 5 from below, the outer cover 3 side can be assembled very easily.

Further, when the outer cover 3 shown in FIG. 1 or FIG. 7 is fitted to the sensor body 1, the bifurcated sandwiching piece 18 formed at the tip of the conduction terminal 15 on the outer cover 3 side is the sensor. The terminal screw 20 on the main body 1 side is fitted so as to sandwich the head, and the conductive connection becomes more reliable than in the conventional simple pressing contact, and problems such as contact failure can be almost completely eliminated.

Further, as is clear from FIG. 5, the conducting metal fitting 14 is installed at a position defined by the pedestal 36 which is separated from the smoke inlet 32 formed around the outer cover 3, so that even if the conducting metal fitting 15 is installed in the outer cover 3, it is sensed. The smoke sensing function of the smoke sensing unit 14 can be fully exerted without blocking the inflow of smoke from the outside into the smoke sensing unit 14 of the container body 1.

Furthermore, when the outer cover 3 is fitted to the sensor body 1 shown in FIG.
Is screwed to the pedestal 36, the pedestal 36
With respect to the head of the terminal screw 20 of the sensor main body of the conducting metal fitting 15 through the smoke inlets 32 located on both sides, it is possible to easily confirm the sandwiched state by the contact sandwiching piece 18 at the tip, and if it is assembled. At times, even if the two are not in good contact with each other, the contact state can be immediately checked by visual inspection.

[Effects of the Invention] As described above, according to the present invention, a structure in which a conduction metal fitting is fixed to the outer cover side and the smoke sensing portion provided in the sensor body is connected to the sensor body side without penetrating Therefore, the sensor main body and the outer cover can be separately assembled, and as a result, the assembling work can be facilitated and the manufacturing process can be simplified.

Also, since the conduction metal fitting does not penetrate the smoke sensing part of the sensor body, it is possible to share the sensor body dedicated to smoke with the composite type, and by changing only the outer cover side, it can be dedicated to smoke or compound type. Therefore, it is possible to improve the production efficiency and reduce the cost by sharing the sensor main body.

Furthermore, since the conducting metal fittings provided on the outer cover side extend to the sensor body side along the inner wall of the outer cover that has deviated from the smoke inlet, there is no effect on the smoke inflow characteristics, and the smoke sensing ability is not affected. Does not interfere with.

Furthermore, since a contact holding piece having a spring property divided into two forks is formed at the tip of the conductive fitting to make conductive contact by sandwiching the head of the terminal member of the sensor body, the conductive contact is performed more reliably. It is possible to solve the problem of poor contact almost completely.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the present invention; FIG. 2 is a sectional view showing a sensor body and an outer cover separately; FIG. 3 is an exploded view of the sensor body of FIG. FIG. 4 is an exploded view of the outer cover of FIG. 1; FIG. 5 is a plan view showing the inner structure of the outer cover of the present invention; FIG. 7 is an explanatory view showing a conducting structure of a conducting metal fitting and a terminal screw in the present invention, and FIG. 8 is a sectional view showing a conventional structure. 1: Sensor body 3: Outer cover 5: Mounting hole 6: Heat detector 7: Heat sensitive plate 9: Conductive terminal 12: Printed circuit board 13: Circuit housing 14: Smoke detector 15: Conductive fitting 16: Screw 18: Contact Holding piece 20: Terminal screw 21: Fitting metal fitting 22: Body cover 23: Shield case 24: Light emitting element for test 25: Light receiving element 27: Light emitting element 28: Insect screen 30: Bottom cover 32: Smoke inlet 33: Rectangular Hole 35: Screw hole 36: Pedestal 37: Presser 38: Support wall 39: Bottom of tip 40: Fitting protrusion

Claims (1)

[Scope of utility model registration request] 1. A sensor body having a smoke sensing section, an outer cover fitted around the sensor body, having a smoke inlet around the sensor body, and attached to the bottom of the outer cover exposed to the outside. A combined fire detector having a heat sensing part, which senses smoke and heat by the smoke sensing part and the heat sensing part. A contact sandwiching piece having a spring property, which is connected to the conduction terminal of the heat sensing section and extends to the sensor body side along the inner wall of the cover, the other end of which is separated from the smoke inlet, and which has a bifurcated tip end. And a terminal member fixed to a position of the sensor main body facing a contact sandwiching piece of the conductive metal; and by fitting the outer cover to the sensor main body, Hold the head of the terminal member on the sensor body side with the contact pinching piece formed at the tip. Conducting structure of the composite type fire detector, characterized by being configured such that through contact.