CN210377768U

CN210377768U - Labyrinth smoke inlet structure of smoke alarm

Info

Publication number: CN210377768U
Application number: CN201921877167.0U
Authority: CN
Inventors: 高庆斌; 张金
Original assignee: Shenzhen Fanhai Sanjiang Electronics Co Ltd
Current assignee: Shenzhen Hi Tech Investment Sanjiang Electronics Co ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-04-21
Anticipated expiration: 2029-11-04

Abstract

A labyrinth smoke inlet structure of a smoke alarm comprises a light shield, a shell with an opening at the upper end, and a photoelectric sensing device arranged in the shell, wherein the shell is provided with a cover plate for covering the opening, and a light blocking block longitudinally penetrating through the cover plate; the light shield comprises a circular smoke inlet net surrounding the light blocking block and a light shield which is arranged on the upper side of the light blocking block and fixedly connected with the smoke inlet net; the cover plate is provided with a smoke inlet groove which is convenient for smoke to pass through, and the inner wall of the smoke inlet groove is provided with a light blocking ring which prevents external light from directly irradiating into the inner cavity of the shell; a plurality of longitudinal guide plates are arranged on the light blocking block in a surrounding manner, and the guide plates are all connected with the upper surface of the cover plate; external smoke enters the inner cavity of the shell from one side of the light blocking block and leaves the inner cavity of the shell from the other side of the light blocking block, so that a complete smoke flowing channel can be formed, and the smoke inlet effect is better; meanwhile, a light blocking ring is arranged in the smoke inlet groove, so that external light is effectively prevented from entering the optical labyrinth.

Description

Labyrinth smoke inlet structure of smoke alarm

Technical Field

The utility model relates to a smoke alarm technical field, more specifically say, relate to a smoke alarm's maze advances cigarette structure.

Background

The optical maze has the main function that the smoke concentration entering a sensitive area of the optical maze is monitored by an optical method, when the smoke concentration reaches an alarm threshold value of a detector, an alarm is given, and how to effectively enter the sensitive area of the maze is a problem which needs to be considered when the maze is designed; smoke is also a fluid that has the basic properties of a fluid, and therefore, the flow velocity and concentration profile of smoke are closely related to the smoke inlet structure; at present, the side feeding mode is adopted in most labs, a smoke feeding structure is not specially designed, and meanwhile, a plurality of branches are arranged for shading light, but the branches block smoke, so that the smoke is difficult to enter a sensitive area of the labyrinth.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, a smoke alarm's maze advances cigarette structure is provided.

The utility model provides a technical scheme that its technical problem adopted is:

the labyrinth smoke inlet structure of the smoke alarm comprises a light shield, a shell with an opening at the upper end and a photoelectric sensing device arranged in the shell, wherein the shell is provided with a cover plate for covering the opening and a light blocking block longitudinally penetrating through the cover plate; the light shield comprises a circular smoke inlet net surrounding the light blocking block and a light shielding plate which is arranged on the upper side of the light blocking block and fixedly connected with the smoke inlet net; the cover plate is provided with a smoke inlet groove which is convenient for smoke to pass through, and the inner wall of the smoke inlet groove is provided with a light blocking ring which prevents external light from directly entering the inner cavity of the shell; a plurality of longitudinal guide plates are arranged on the light blocking block in a surrounding mode, and the guide plates are all connected with the upper surface of the cover plate.

Smoke alarm's maze advance cigarette structure, wherein, the barn door is under the narrow annular structure of width, just the lower extreme of barn door with advance the inner wall fixed connection in cigarette groove.

Smoke alarm's maze advance cigarette structure, wherein, guide plate quantity is the even number and is four at least.

Smoke alarm's maze advance cigarette structure, wherein, photoelectric sensing device includes transmitting tube and receiver tube, the transmitting tube with the crossing and crossing department of optical axis of receiver tube forms the optical sensitive district, the optical sensitive district is located the below of the piece that is in the light.

Smoke alarm's maze smoke inlet structure, wherein, the piece bottom surface that is in the light is equipped with just right the optical sensitive area with the similar recess of bottom surface shape.

The labyrinth smoke inlet structure of the smoke alarm, wherein, the depth of the groove is 1.7-2.5 mm.

Smoke alarm's maze advance cigarette structure, wherein, the quantity of guide plate is six.

Smoke alarm's maze advance cigarette structure, wherein, the piece that is in the light specifically is regular hexagon, six the guide plate is fixed respectively for regular hexagon on six angles of the piece that is in the light.

Smoke alarm's maze advances cigarette structure, wherein, the inner chamber of casing include that the upper end opening is circular shape maze chamber, and with maze chamber lateral wall intercommunication just to photoelectric sensing device's extinction chamber.

Smoke alarm's maze advances cigarette structure, wherein, it is circular groove to advance the cigarette groove, the apron is including covering labyrinth chamber upper end open-ended circular board, and cover extinction chamber upper end open-ended fixed plate.

The beneficial effects of the utility model reside in that: the smoke inlet channel is formed by the adjacent guide plates on one side of the light blocking block and the adjacent guide plates on the other side of the light blocking block, the smoke outlet channel is formed by the adjacent guide plates on the other side of the light blocking block, external smoke enters the inner cavity of the shell from the smoke inlet channel and leaves the inner cavity of the shell from the smoke outlet channel, and therefore a smoke flowing channel can be formed, more smoke is fed, the smoke inlet effect is better, and the sensitivity is higher; meanwhile, the light blocking ring is arranged in the smoke inlet groove and matched with the light blocking block, so that external light passing through the smoke inlet net is effectively prevented from directly entering the inner cavity of the shell, and the accuracy of the photoelectric sensing device is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:

fig. 1 is an axial view of a labyrinth smoke inlet structure of a smoke alarm according to a preferred embodiment of the present invention;

fig. 2 is a sectional view of the labyrinth smoke inlet structure of the smoke alarm according to the preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The labyrinth smoke inlet structure of the smoke alarm of the preferred embodiment of the utility model is as shown in fig. 1, refer to fig. 2, and comprises a light shield 2, a shell 1 with an opening at the upper end, and a photoelectric sensing device 3 arranged in the shell 1, wherein the shell 1 is provided with a cover plate 4 covering the opening, and a light blocking block 5 longitudinally passing through the cover plate 4; the light shield 2 comprises a circular smoke inlet net 21 surrounding the light blocking block 5 and a light shielding plate 22 which is arranged on the upper side of the light blocking block 5 and is fixedly connected with the smoke inlet net 21; a smoke inlet groove 41 which is convenient for smoke to pass through is arranged on the cover plate 4, and a light blocking ring 6 which prevents external light from directly entering the inner cavity of the shell 1 is arranged on the inner wall of the smoke inlet groove 41; a plurality of longitudinal guide plates 7 are arranged on the light blocking block 5 in a surrounding manner, and the guide plates 7 are all connected with the upper surface of the cover plate 4;

external smoke enters the inner cavity of the shell from a smoke inlet channel formed by the adjacent guide plate 7 on one side of the light blocking block 5, and then leaves the inner cavity of the shell 1 from a smoke outlet channel formed by the adjacent guide plate 7 on the other side of the light blocking block 5, so that a complete smoke flowing channel can be formed, more smoke is fed, the smoke feeding effect is better, and the sensitivity is higher; because the smoke has the rising characteristic, when no external smoke flows in, the smoke in the shell 1 is easy to leave from the smoke inlet groove 41, and the smoke is not easy to deposit in the shell; meanwhile, the light blocking ring 6 is arranged in the smoke inlet groove 41 and matched with the light blocking block 5, so that external light rays penetrating through the smoke inlet net 21 are effectively prevented from directly emitting into the inner cavity of the shell 1, and the accuracy of the photoelectric sensing device 3 is higher.

As shown in fig. 1-2, the light-blocking ring 6 is a ring structure with a narrow top and a wide bottom, and the lower end of the light-blocking ring 6 is fixedly connected with the inner wall of the smoke inlet groove 41; the influence of the light-blocking ring 6 on the amount of smoke entering is reduced while preventing external light from entering the housing 1.

As shown in fig. 1-2, the number of baffles 7 is even and at least four; the cigarette is advanced more evenly in a plurality of positions, and outside cigarette forms into the cigarette passageway and gets into the casing inner chamber from the guide plate 7 adjacent on one side of the block 5 that is in the light, forms out the inner chamber that the cigarette passageway left casing 1 through guide plate 7 adjacent on the other side of the block 5 that is in the light, consequently can form a complete smog flow path, and the inner chamber of casing 1 of being convenient for goes out the cigarette and advances the cigarette.

As shown in fig. 1-2, the photo-electric sensing device 3 includes an emitting tube 31 and a receiving tube 32, the optical axes of the emitting tube 31 and the receiving tube 32 intersect and the intersection thereof forms an optical sensitive area 33, the optical sensitive area 33 is located below the light blocking block 5; smoke entering the interior of the housing 1 through multiple orientations is equidistant from the optically sensitive region 33.

As shown in fig. 1-2, the bottom surface of the light-blocking block 5 is provided with a groove 51 with a shape similar to the bottom surface, which is opposite to the optical sensitive area 33; by providing the groove 51, the secondary light reflected by the wall surface thereof is not received by the receiving pipe 32.

As shown in fig. 1-2, the depth of the groove 51 is 1.7-2.5 mm; by providing the groove 51, the secondary light reflected by the wall surface thereof is not received by the receiving pipe 32; the depth of the groove 51 is optimally 2.23 mm.

As shown in fig. 1-2, the number of baffles 7 is six; the cigarette is advanced more evenly in a plurality of positions, and outside smog forms into the cigarette passageway and gets into the casing inner chamber from the guide plate 7 that is adjacent on 5 one sides in the light block, and the rethread is adjacent guide plate 7 on 5 opposite sides in the light block and is formed out the inner chamber that the cigarette passageway left casing 1, consequently can form a complete smog flow path, and the inner chamber of casing 1 of being convenient for goes out the cigarette and advances the cigarette for photoelectric sensing device 3 is more accurate to the detection of smog concentration change.

As shown in fig. 1-2, the light-blocking block 5 is specifically a regular hexagon, and six deflectors 7 are respectively fixed at six corners of the light-blocking block 5 which is a regular hexagon; the smoke enters the inner cavity of the housing 1 along the light block 5 without being affected by the shape of the light block 5.

As shown in fig. 1-2, the inner cavity of the housing 1 includes a labyrinth cavity 11 with a circular opening at the upper end and an extinction cavity 12 communicated with the side wall of the labyrinth cavity 11 and facing the photoelectric sensing device 3; the extinction cavity 12 reduces the light received by the receiving tube and reduces the background value when no smoke exists.

As shown in fig. 1-2, the smoke inlet 41 is a circular groove, the cover plate 4 comprises a circular plate 42 covering the opening at the upper end of the labyrinth cavity 11, and a fixing plate 43 covering the opening at the upper end of the extinction cavity 12; so that the smoke in all directions is more uniform.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. A labyrinth smoke inlet structure of a smoke alarm comprises a light shield, a shell with an opening at the upper end and a photoelectric sensing device arranged in the shell, and is characterized in that the shell is provided with a cover plate for covering the opening and a light blocking block longitudinally penetrating through the cover plate; the light shield comprises a circular smoke inlet net surrounding the light blocking block and a light shielding plate which is arranged on the upper side of the light blocking block and fixedly connected with the smoke inlet net; the cover plate is provided with a smoke inlet groove which is convenient for smoke to pass through, and the inner wall of the smoke inlet groove is provided with a light blocking ring which prevents external light from directly entering the inner cavity of the shell; a plurality of longitudinal guide plates are arranged on the light blocking block in a surrounding mode, and the guide plates are all connected with the upper surface of the cover plate.

2. The labyrinth smoke inlet structure of a smoke alarm according to claim 1, wherein the light barrier is a ring structure with a narrow top and a wide bottom, and the lower end of the light barrier is fixedly connected with the inner wall of the smoke inlet groove.

3. The labyrinth smoke admission structure of a smoke alarm according to claim 1, wherein said baffles are even in number and at least four.

4. The labyrinth smoke admission structure of a smoke alarm according to claim 1, wherein said photoelectric sensing device comprises a transmitting tube and a receiving tube, the optical axes of said transmitting tube and said receiving tube intersect and the intersection thereof forms an optical sensitive area, said optical sensitive area is located below said light-blocking block.

5. The labyrinth smoke admission structure of a smoke alarm according to claim 4, wherein the underside of said light barrier is provided with a recess facing said optically sensitive area.

6. The labyrinth smoke admission structure of a smoke alarm according to claim 5, wherein the depth of said groove is between 1.7 and 2.5 mm.

7. The labyrinth smoke admission structure of a smoke alarm as defined in claim 1 wherein said deflector plates are six in number.

8. The labyrinth smoke inlet structure of a smoke alarm according to claim 7, wherein said light-blocking block is a regular hexagon, and six said deflectors are fixed to six corners of said light-blocking block which is a regular hexagon, respectively.

9. The labyrinth smoke inlet structure of a smoke alarm as claimed in claim 1, wherein the inner cavity of the housing comprises a labyrinth cavity with a circular upper end opening and a extinction cavity communicated with the side wall of the labyrinth cavity and facing the photoelectric sensing device.

10. The labyrinth smoke inlet structure of a smoke alarm as claimed in claim 9, wherein said smoke inlet groove is a circular groove, and said cover plate comprises a circular plate covering an upper opening of said labyrinth chamber and a fixing plate covering an upper opening of said extinction chamber.