CN110718037A - Labyrinth smoke inlet structure of smoke alarm - Google Patents
Labyrinth smoke inlet structure of smoke alarm Download PDFInfo
- Publication number
- CN110718037A CN110718037A CN201911064046.9A CN201911064046A CN110718037A CN 110718037 A CN110718037 A CN 110718037A CN 201911064046 A CN201911064046 A CN 201911064046A CN 110718037 A CN110718037 A CN 110718037A
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- China
- Prior art keywords
- smoke
- light
- labyrinth
- smoke inlet
- blocking block
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
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
Technical Field
The invention relates to the technical field of smoke alarms, in particular to a labyrinth smoke inlet structure of a smoke alarm.
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.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a labyrinth smoke inlet structure of a smoke alarm, aiming at the above-mentioned defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
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.
The labyrinth smoke inlet structure of the smoke alarm is characterized in that the light blocking ring is of an annular structure with a narrow upper part and a wide lower part, and the lower end of the light blocking ring is fixedly connected with the inner wall of the smoke inlet groove.
The labyrinth smoke inlet structure of the smoke alarm is characterized in that the number of the guide plates is even and is at least four.
The labyrinth smoke inlet structure of the smoke alarm comprises a transmitting tube and a receiving tube, wherein the optical axes of the transmitting tube and the receiving tube are intersected, an optical sensitive area is formed at the intersection of the optical axes of the transmitting tube and the receiving tube, and the optical sensitive area is positioned below a light blocking block.
The labyrinth smoke inlet structure of the smoke alarm comprises a light blocking block, wherein the bottom surface of the light blocking block is provided with a groove which is opposite to the optical sensitive area and is similar to the bottom surface in shape.
The labyrinth smoke inlet structure of the smoke alarm is characterized in that the depth of the groove is 1.7-2.5 mm.
The labyrinth smoke inlet structure of the smoke alarm is characterized in that the number of the guide plates is six.
The labyrinth smoke inlet structure of the smoke alarm is characterized in that the light blocking block is a regular hexagon, and six guide plates are fixed on six corners of the light blocking block which is the regular hexagon respectively.
The labyrinth smoke inlet structure of the smoke alarm comprises a labyrinth cavity and a light elimination cavity, wherein the labyrinth cavity is provided with a circular upper end opening, and the light elimination cavity is communicated with the side wall of the labyrinth cavity and is opposite to a photoelectric sensing device.
The labyrinth smoke inlet structure of the smoke alarm comprises a smoke inlet groove, a cover plate and a smoke exhaust groove, wherein the smoke inlet groove is a circular groove, the cover plate comprises a circular plate covering an opening at the upper end of a labyrinth cavity, and a fixing plate covering an opening at the upper end of a extinction cavity.
The invention has the beneficial effects 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 with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the accompanying drawings:
FIG. 1 is an axial schematic view of the labyrinth smoke inlet structure of the smoke alarm of the preferred embodiment of the present invention;
figure 2 is a cutaway schematic view of the labyrinth smoke inlet structure of the smoke alarm of the preferred embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
The labyrinth smoke inlet structure of the smoke alarm of the preferred embodiment of the invention is shown in fig. 1, referring 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 for covering the opening, and a light blocking block 5 longitudinally penetrating 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 intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064046.9A CN110718037A (en) | 2019-11-04 | 2019-11-04 | Labyrinth smoke inlet structure of smoke alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064046.9A CN110718037A (en) | 2019-11-04 | 2019-11-04 | Labyrinth smoke inlet structure of smoke alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110718037A true CN110718037A (en) | 2020-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911064046.9A Pending CN110718037A (en) | 2019-11-04 | 2019-11-04 | Labyrinth smoke inlet structure of smoke alarm |
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| Country | Link |
|---|---|
| CN (1) | CN110718037A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111795951A (en) * | 2020-05-28 | 2020-10-20 | 南京颗粒光电科技有限公司 | Integrated sensor for thermal runaway detection of new energy battery and early warning method |
| CN112542019A (en) * | 2020-12-02 | 2021-03-23 | 刘晓明 | From sensor of taking labyrinth alarm system |
-
2019
- 2019-11-04 CN CN201911064046.9A patent/CN110718037A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111795951A (en) * | 2020-05-28 | 2020-10-20 | 南京颗粒光电科技有限公司 | Integrated sensor for thermal runaway detection of new energy battery and early warning method |
| CN112542019A (en) * | 2020-12-02 | 2021-03-23 | 刘晓明 | From sensor of taking labyrinth alarm system |
| CN112542019B (en) * | 2020-12-02 | 2022-07-22 | 江苏新力科技实业有限公司 | From sensor of taking labyrinth alarm system |
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| PB01 | Publication | ||
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Address after: 518000 the three floor of the new world apartment, Nanshan Avenue, Nanshan District, Shenzhen, Guangdong (for office only). Applicant after: Shenzhen hi tech investment Sanjiang Electronics Co.,Ltd. Address before: 518000 the three floor of the new world apartment, Nanshan Avenue, Nanshan District, Shenzhen, Guangdong (for office only). Applicant before: SHENZHEN FANHAI SANJIANG ELECTRONICS Co.,Ltd. |