CN108106978B

CN108106978B - Smoke darkroom and smoke detector adopting same

Info

Publication number: CN108106978B
Application number: CN201611061837.2A
Authority: CN
Inventors: 罗武仁
Original assignee: Nanning Fugui Precision Industrial Co Ltd
Current assignee: Nanning Fulian Fugui Precision Industrial Co Ltd
Priority date: 2016-11-25
Filing date: 2016-11-25
Publication date: 2020-07-07
Anticipated expiration: 2036-11-25
Also published as: CN108106978A

Abstract

A smog dark room and adopt the smog detector of the smog dark room, the smog dark room includes smog detection room and smog detection room upper cover, the smog detection room has a smoke detection room to hold smog inside, one side of the smoke detection room has openings matching with smog detection room upper cover, another side of the smoke detection room has light emitter mount department and light receiver mount department set up relatively, the smog detection room outer wall forms the first step reflecting wall contracting to the opening side; a cavity with an opening at one end is formed on the upper cover of the smoke detection chamber, and an annular light blocking wall is fixed in the cavity; the light blocking wall is arranged opposite to the opening and forms a smoke channel with the opening at intervals. The first step reflecting wall can greatly reflect the external light of the smoke detection chamber, and the influence of the external light on the smoke detection sensitivity is reduced.

Description

Smoke darkroom and smoke detector adopting same

Technical Field

The invention relates to a fire detection device, in particular to a smoke darkroom and a smoke detector adopting the smoke darkroom.

Background

The smoke detector is used as a safety device for detecting and warning fire, and has great significance for ensuring the safety of people in families, offices and other public places.

The photoelectric smoke detector utilizes the shielding and scattering effect of smoke on light to achieve the purpose of smoke detection, and is mainly characterized by comprising an infrared emission source, an infrared receiver and a smoke darkroom. The infrared emission source emits signals at intervals, and when no smoke enters the smoke darkroom, the infrared receiver cannot receive the infrared signals. When smoke enters the smoke darkroom, the smoke can reflect and scatter the infrared signal to different positions and directions, and once the infrared receiver receives the infrared signal, the smoke is generated and a fire alarm is sent out immediately.

In use, external light and signals easily enter the smoke darkroom, causing false alarms, reducing the sensitivity of the smoke detector.

Disclosure of Invention

Accordingly, there is a need for a smoke darkroom that reduces the effect of external light on smoke detection sensitivity.

A smoke darkroom for a smoke detector comprises a smoke detection chamber and a smoke detection chamber upper cover, wherein a smoke detection chamber for accommodating smoke is arranged in the smoke detection chamber, one side of the smoke detection chamber is provided with an opening matched with the smoke detection chamber upper cover, the other side of the smoke detection chamber is provided with a light emitter mounting part and a light receiver mounting part which are oppositely arranged, and the smoke detection chamber outer wall forms a first step light reflecting wall which is contracted towards the opening side; a cavity with one open end is formed on the upper cover of the smoke detection chamber, and an annular light blocking wall is fixed in the cavity; the light blocking wall is arranged opposite to the opening and forms a smoke channel with the opening at intervals.

Preferably, an end face of a free end of the light blocking wall is flush with an end face of the opening, and a projection of the light blocking wall on the smoke detection chamber falls within the smoke detection chamber.

Preferably, a second step reflective wall is arranged in the cavity of the smoke detection chamber upper cover and is opposite to the first step reflective wall.

Preferably, the upper cover of the smoke detection chamber comprises a cover plate and a wing plate extending obliquely along the edge of the cover plate, the wing plate is arranged in parallel with the first step light reflecting wall, and the extending end of the wing plate is flush with the end face of the opening.

Preferably, a sawtooth reflecting structure arranged opposite to the light emitter mounting part is arranged in the cavity of the smoke detection chamber upper cover; when smoke does not enter the smoke detection chamber, light emitted from the light emitter mounting part is reflected by the sawtooth reflecting structure along the original path.

Preferably, the smog darkroom still includes a base that is used for installing a circuit board and one is used for connecting the base reaches the part fixing base of smog chamber, be equipped with relative first light emitter that sets up on the part fixing base and hold the face and first light receiver and hold the face of leaning on, it holds the face and second light receiver and holds the face of leaning on to correspond the second light emitter that is equipped with relative setting in the smog chamber, first light emitter hold the face of leaning on with second light emitter holds the face of leaning on and supports and lean on the formation the light emitter installation department, first light receiver holds the face of leaning on and second light receiver and holds the face of leaning on and support and lean on the formation the light receiver installation department.

A smoke detector comprises a base, a shell fixed on the base, a smoke darkroom fixed in the shell, a light emitter, a light receiver and a circuit board corresponding to the light emitter and the light receiver, wherein the smoke darkroom is any one of the smoke darkrooms in the limits.

Preferably, the housing includes a top plate and a stepped annular side wall connected to the top plate, and the side wall is provided with a smoke inlet communicated with the smoke passage in the smoke darkroom.

Preferably, the smoke detector further comprises a testing unit, an alarming unit and an operating unit, wherein the testing unit, the alarming unit and the operating unit are arranged in the shell.

Preferably, the test unit comprises a flexible circuit board, and a test element and a key which are arranged on the flexible circuit board, and the warning unit comprises a plurality of warning lamps; the shell is provided with a key hole corresponding to the key and a light guide hole corresponding to the warning lamp.

In the smoke darkroom and the smoke detector adopting the same, the first step light-reflecting wall can reflect the external light of the smoke detecting room greatly, and the light-blocking wall also has the function of blocking the external light from entering the smoke detecting room, so that the influence of the external light on the smoke detecting sensitivity is reduced.

Drawings

Figure 1 is a schematic diagram of a smoke detector in a preferred embodiment.

Fig. 2 is a cross-sectional view a-a of the smoke detector of fig. 1.

Fig. 3 is an exploded view of the smoke detector of fig. 1.

Fig. 4 is a schematic structural diagram of the base in fig. 3.

Fig. 5 is a schematic view of the component holder shown in fig. 3.

Fig. 6 is a schematic view of the smoke detection chamber of fig. 3.

Fig. 7 is a schematic view of the smoke detection chamber of fig. 6 from another perspective.

Fig. 8 is a schematic structural view of the upper cover of the smoke detection chamber in fig. 3.

Fig. 9 is a schematic view of the smoke detection chamber of fig. 8 from another perspective.

Fig. 10 is a schematic structural view of the housing in fig. 3.

Fig. 11 is a schematic diagram illustrating the operation of the smoke detector in fig. 2.

Description of the main elements

1 Smoke detector

11 smog dark room

10 base

20 bottom cover

30 circuit board

40 parts fixing seat

50 smoke detection chamber

60 smoke detection chamber upper cover

70 light belt

80 flexible circuit board

90 outer casing

100 push-button

110 wiring hole

120 casing fixing buckle

130 fixed hole

301 circuit board fixing screw

302 infrared light emitter

303 infrared light receiver

401 first plane

402 second plane

403 bevel

410 first emitter bearing surface

420 first receiver bearing surface

430 positioning column

440 first fixing hook

510 Flange

520 Boss

530 bayonet

540 Signal exit hole

541 second emitter bearing surface

550 signal receiving hole

551 second receiver bearing surface

560 smoke detection chamber

570 first step reflective wall

580 upper cover supporting plate

590 light shade

591 mounting part

592 screw hole

610 second step reflective wall

620 saw tooth reflecting structure

630 second fixing hook

640 light blocking wall

650 flexible circuit board support surface

660 flexible circuit board positioning part

710 warning lamp

901 first installation room

902 second installation room

910 key hole

920 light guide post hole

930 bottom cover fixing screw hole

940 circuit board fixing screw hole

950 smog inlet

960 fixed tenon

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

Fig. 1 to 3 are schematic structural views of a smoke detector 1 in a preferred embodiment.

The smoke detector 1 comprises a base 10, a housing 90 fixed on the base 10, a smoke darkroom 11 arranged inside the housing 90, a circuit board 30, a light emitter 302 connected to the circuit board 30, and a light receiver 303. A smoke inlet 950 is provided in the housing 90 to allow smoke to enter the smoke darkroom 11. The light emitter 302 and the light receiver 303 are connected to the circuit board 30, and an included angle between an optical axis of the light emitter 302 and an optical axis of the light receiver 303 can be preset to be an obtuse angle. It should be noted that an included angle between the optical axis of the light emitter 302 and the optical axis of the light receiver 303 may also be set to be an acute angle, and it is only required to satisfy that the optical axis of the light emitter 302 and the optical axis of the light receiver 303 are not collinear, and the light emitted by the light emitter 302 does not directly enter the light receiver 303.

The smoke darkroom 11 comprises a smoke detection chamber 50, a bottom cover 20 and a smoke detection chamber upper cover 60, wherein the bottom cover 20 and the smoke detection chamber upper cover 60 respectively close two ends of the smoke detection chamber 50. The circuit board 30 is mounted on the smoke detection chamber 50 by a component holder 40 and a circuit board fixing screw 301.

Referring to fig. 4, the base 10 is provided with a wiring hole 110 and a fixing hole 130 matching with the circuit board 30, and a housing fixing buckle 120 matching with the housing 90. The external leads of the circuit board 30 can be led out of the smoke detector 1 through the wiring hole 110.

Referring to fig. 5, the component holder 40 includes a first surface 401 and a second surface 402 disposed in parallel and opposite to each other, two parallel side surfaces (not shown) vertically connected between the first surface 401 and the second surface 402, and two opposite inclined surfaces 403 connected between the first surface 401 and the second surface 402. The inclined surfaces 403 are respectively formed with a first optical transmitter bearing surface 410 corresponding to the optical transmitter 302 and a first optical receiver bearing surface 420 corresponding to the optical receiver 303. Accordingly, the included angle between the two inclined surfaces 403 is consistent with the included angle formed by the optical axis of the optical transmitter 302 and the optical axis of the optical receiver 303. The first surface 401 interfaces with the smoke detection chamber 50 and the second surface 402 interfaces with the circuit board 30. The two side surfaces are provided with first fixing hooks 440 extending to the side where the second surface 402 is located for fixing and connecting the circuit board 30. At least two positioning posts 430 are disposed on a side of the second surface 402, and the positioning posts 430 are matched with predetermined positioning holes on the circuit board 30 to determine the mounting position of the circuit board 30, so as to ensure the mounting positions of the light emitter 302 and the light receiver 303.

Referring to fig. 6 and 7, a smoke detection chamber 560 for accommodating smoke is disposed inside the smoke detection chamber 50, an opening (not shown) is disposed on one side of the smoke detection chamber 560 and is matched with the smoke detection chamber top cover 60, and a light shield 590 is connected to the other side of the smoke detection chamber 560. The light shield 590 is provided with a second light emitter bearing surface 541 and a second light receiver bearing surface 551, the second light emitter bearing surface 541 and the first light emitter bearing surface 410 are matched to form a light emitter mounting part, and the second light receiver bearing surface 551 and the first light receiver bearing surface 420 are matched to form a light receiver mounting part. For example, in a specific implementation, the second light emitter bearing surface 541 and the first light emitter bearing surface 410, the second light receiver bearing surface 551 and the first light receiver bearing surface 420 may be configured as mutually matched semicircular holes, and a circular through hole is formed after two are matched, and the circular through hole may serve as a mounting portion for the light emitter 302 and the light receiver 303 and has a guiding function for the light emitter 302 and the light receiver 303. In one embodiment, the smoke detection chamber 560 and the light shield 590 are separated into two separate chambers, and a signal exit hole 540 matching with the light emitter 302 and a signal receiving hole 550 matching with the light receiver 303 are formed at the joint of the smoke detection chamber 560 and the light shield 590, so that the light emitted from the light emitter 302 exits to the smoke detection chamber 560 through the signal exit hole 540, and meanwhile, the light scattered by the smoke in the smoke detection chamber 560 can enter the light receiver 303 through the signal receiving hole 550.

The outer walls of the chamber 50 form a first stepped reflective wall 570 that converges towards the open side. Since the smoke inlet formed in the housing 90 provides an inlet for external light while introducing smoke into the smoke detection chamber 560, the first step reflective wall 570 disposed on the outer wall of the smoke detection chamber 50 can greatly reflect external light, thereby reducing external light entering the smoke detection chamber 560 and received by the light receiver 303, and improving the sensitivity and accuracy of the smoke detector 1.

An annular flange 510 is formed on the outer side of the smoke detection chamber 50, and a plurality of bayonets are formed on the flange 510 for clamping the upper cover 60 of the smoke detection chamber. The smoke detection chamber 50 may also be mounted to the housing 90 by a flange 510. A plurality of upper cover supporting plates 580 are distributed on the first step reflecting wall 570, and the smoke detection chamber upper cover 60 is clamped on the smoke detection chamber 50 and is supported and positioned by the upper cover supporting plates 580. The flange 510 also has a boss 520 formed thereon for mounting an insect net.

At least two mounting portions 591 are disposed on the periphery of the light shielding cover 590, and screw holes 592 may be disposed on the mounting portions 591, so that the circuit board 30 may be mounted on the smoke detection chamber 50 by screws.

Referring to fig. 8 and 9, the smoke detection chamber cover 60 forms a chamber (not shown) with an open end, and an annular light blocking wall 640 is fixed in the chamber. The light blocking wall 640 is disposed opposite to the opening of the smoke detection chamber 560 and forms a smoke channel with the opening of the smoke detection chamber 560 at a spacing. For example, in an implementation, the end surface of the free end of light-blocking wall 640 is flush with the end surface of the opening of smoke-detecting chamber 560, and the projection of light-blocking wall 640 on smoke-detecting chamber 560 falls within smoke-detecting chamber 560.

In a preferred embodiment, a second step reflective wall 610 is disposed opposite to the first step reflective wall 570 in the chamber of the smoke detection chamber top cover 60, and the second step reflective wall 610 may be disposed parallel to the first step reflective wall 570. For example, in one embodiment, the smoke detection chamber cover 60 may include a cover plate and obliquely extending wings along the edge of the cover plate, the wings being disposed parallel to the first step reflective wall 570, the outward extending ends of the wings being flush with the end surface of the opening of the smoke detection chamber 560, and the second step reflective wall 610 being disposed on the wings.

In another preferred embodiment, a saw-tooth light reflecting structure 620 is disposed in the cavity of the smoke detection chamber cover 60 opposite to the mounting portion of the light emitter 302, and when no smoke enters the smoke detection chamber 50, the light emitted from the light emitter 302 is reflected by the saw-tooth light reflecting structure 620 along the original path, thereby avoiding false alarm caused by malfunction of the light emitter 302.

Referring also to fig. 10, the housing 90 includes a first installation chamber 901 and a second installation chamber 902 which are arranged in a stepped manner, and a smoke inlet 950 is opened between the first installation chamber 901 and the second installation chamber 902. A bottom cover fixing screw hole 930 and a circuit board fixing screw hole 940 are formed in the second mounting chamber 902, for mounting the bottom cover 20 and the circuit board 30, respectively. One side of the second mounting chamber 902 is an open end, and the outside of the open end is provided with a fixing latch 960 matching with the housing fixing latch 120 on the base 10.

Referring to fig. 3 and 10, in another preferred embodiment, the smoke detector 1 further includes a testing unit, an alarming unit and an operating unit disposed in the housing 90, for example, the testing unit includes a flexible circuit board 80, a testing device (not shown) mounted on the flexible circuit board, and keys 100, the alarming unit is a light strip 70, and a plurality of alarming lights 710 are disposed on the light strip 70. Correspondingly, the first installation chamber 901 of the housing 90 is provided with a key hole 910 corresponding to the key 100 and a light guide hole 920 corresponding to the warning light, for example, a plurality of LED lights with different colors may be provided to display the preset status in order to visually display the smoke concentration in the current environment, the emergency degree of fire, the operating status of the smoke detector 1, and the like.

Referring to fig. 11, smoke (not shown) in the external environment may enter the housing 90 through the smoke inlet 950 of the housing 90, and then enter the smoke detection chamber 560 through the channel between the first step reflective wall 570 and the second step reflective wall 610, the emergent light of the light emitter 302 is scattered by the smoke in the smoke detection chamber 560 and enters the light receiver 303, and the scattered light received by the light receiver 303 reaches a predetermined value to trigger an alarm.

The inclined surfaces of the first stepped reflective wall 570 and the second stepped reflective wall 610 may be formed by a plurality of steps perpendicular to each other, and a light ray entering horizontally in an external environment encounters the steps of the first stepped reflective wall 570 and the second stepped reflective wall 610 and is reflected along the original path, so that even though a portion of the light ray enters from the passage between the first stepped reflective wall 570 and the second stepped reflective wall 610, the light ray irradiates the light blocking wall 640 of the smoke detecting chamber cover 60 and is then reflected outward at a large angle. Part of the light will be incident on the sawtooth reflective structure 620 of the top cover of the smoke detection chamber, and the small sawtooth structures will also reflect the incident light outward at a large angle. By the above emission, most of the external light is blocked outside the smoke detection chamber 560, so that the interference of the external light to the smoke detector 1 is greatly reduced. The solid lines with arrows in fig. 11 show part of the incident light rays, and the broken lines with arrows show part of the reflected light rays.

When smoke does not enter the smoke detector 1 or the smoke concentration is lower than the preset alarm threshold, the emergent light of the light emitter 302 directly irradiates the sawtooth reflecting structure 620 of the upper cover of the smoke detection chamber, the sawteeth of the sawtooth reflecting structure 620 are arranged at a preset angle and reflect the emergent light along the original path direction, at this time, the emergent light is not scattered or a very small part of the emergent light is scattered, the light receiver 303 does not receive scattered light, or the received scattered light does not reach the preset value, and the alarm is not triggered.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a smog darkroom for the smog detector, includes smog and surveys room and smog and survey the room upper cover, the indoor portion of smog is equipped with a detection smoke room that holds smog, its characterized in that: an opening matched with the upper cover of the smoke detection chamber is formed in one side of the smoke detection chamber, a light emitter mounting part and a light receiver mounting part which are oppositely arranged are arranged in the other side of the smoke detection chamber, and a first step light reflecting wall which is contracted towards the opening side is formed in the outer wall of the smoke detection chamber; a cavity with one open end is formed on the smoke detection chamber upper cover, and a light blocking wall is fixed in the cavity; the light blocking wall is arranged opposite to the opening and forms a smoke channel with the opening at intervals; the smoke detection chamber comprises a smoke detection chamber upper cover, and is characterized in that a cavity of the smoke detection chamber upper cover is internally provided with a second step reflecting wall which is arranged opposite to the first step reflecting wall at an interval, a channel communicated with the smoke channel is formed between the first step reflecting wall and the second step reflecting wall, and the inclined surfaces of the first step reflecting wall and the second step reflecting wall are formed by a plurality of steps which are vertical to each other.

2. A smoke darkroom as defined in claim 1, wherein: the end face of the free end of the light blocking wall is flush with the end face of the opening, and the projection of the light blocking wall on the smoke detection chamber is located in the smoke detection chamber.

3. A smoke darkroom as defined in claim 1, wherein: the smoke detection chamber upper cover comprises a cover plate and a wing plate extending along the edge of the cover plate in an inclined mode, the wing plate is parallel to the first step light reflecting wall, and the extending end of the wing plate is flush with the end face of the opening.

4. A smoke darkroom as defined in claim 1, wherein: a sawtooth light reflecting structure arranged opposite to the light emitter mounting part is arranged in the cavity of the smoke detection chamber upper cover; when smoke does not enter the smoke detection chamber, light emitted from the light emitter mounting part is reflected by the sawtooth reflecting structure along the original path.

5. A smoke darkroom as defined in claim 1, wherein: the smog darkroom still includes a base and one that is used for installing a circuit board and is used for connecting the base reaches the part fixing base of smog listening room, be equipped with relative first light emitter that sets up on the part fixing base and hold the face and first light receiver and hold the face of leaning on, it holds the face and second light receiver and holds the face of leaning on to be equipped with the relative second light emitter that sets up in the smog chamber correspondingly, first light emitter hold the face of leaning on with second light emitter holds the face of leaning on and supports and lean on the formation the light emitter installation department, first light receiver holds the face of leaning on and second light receiver holds the face of leaning on and supports and lean on the formation the light receiver installation department.

6. A smoke detector comprises a base, a shell fixed on the base, a smoke darkroom fixed in the shell, a light emitter, a light receiver and a circuit board corresponding to the light emitter and the light receiver, and is characterized in that: the smoke darkroom is as claimed in any one of claims 1 to 5.

7. The smoke detector of claim 6, wherein: the shell comprises a top plate and a stepped annular side wall connected to the top plate, and a smoke inlet communicated with a smoke channel on the smoke darkroom is formed in the side wall.

8. The smoke detector of claim 6, wherein: the smoke detector also comprises a testing unit, a warning unit and an operating unit which are arranged in the shell.

9. The smoke detector of claim 8, wherein: the test unit comprises a flexible circuit board, a test element and a key which are arranged on the flexible circuit board, and the warning unit comprises a plurality of warning lamps; the shell is provided with a key hole corresponding to the key and a light guide hole corresponding to the warning lamp.