CN108416967A - A kind of back scattering labyrinth - Google Patents
A kind of back scattering labyrinth Download PDFInfo
- Publication number
- CN108416967A CN108416967A CN201810119043.XA CN201810119043A CN108416967A CN 108416967 A CN108416967 A CN 108416967A CN 201810119043 A CN201810119043 A CN 201810119043A CN 108416967 A CN108416967 A CN 108416967A
- Authority
- CN
- China
- Prior art keywords
- labyrinth
- central axes
- tube socket
- receiving unit
- transmitter unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- 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
- G08B17/107—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 for detecting light-scattering due to smoke
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
A kind of back scattering labyrinth, including shading wall and tube socket, tube socket is interior to be equipped with transmitter unit and receiving unit, and transmitter unit and receiving unit are along tube socket central axes symmetry arrangement；Tube socket central axes are with labyrinth central axes at angle β, 0 ° of 90 ° of ＜ β ＜；The central optical axis of the transmitter unit and the central optical axis of receiving unit are intersected on the central axes of labyrinth.Since in the present invention, tube socket central axes have certain angle with labyrinth central axes.The presence of this angle can make the light that transmitter unit is sent out, and the multiple reflections on shading wall, the light after reflection enters finally into receiving unit.Due to the increase of order of reflection, light ray energy can gradually decay, to reduce the background value in labyrinth.After background value reduces, background value and the difference of fire alarm value just increase, and reduce wrong report risk.
Description
Technical field
This application involves smoke alarms, and in particular to a kind of back scattering fan applied to photoelectricity cigarette sense fire detector
Palace.
Background technology
Scatter-type smoke detector mainly has two kinds of forms of forward scattering and back scattering.The central optical axis of transmitter unit and
It is forward scattering that the central optical axis angle of receiving unit, which is more than 90 °, and it is back scattering to be less than 90 °.Wherein forward scattering is sensitive
Spend it is relatively high, but it is insensitive to black smoke.The remolding sensitivity of back scattering is relatively low, but sensitive to black smoke.This is mainly by cigarette
" Mie scatterings " characteristic of mist particle determines, is the build-in attribute shown when smoke particle detects light, so backward dissipate
It penetrates sensitiveer to black smoke.
When labyrinth works, transmitter unit can launch light beam, and being received unit after wall surface reflection inside labyrinth receives,
When no smog enters labyrinth, the optical signal that receiving unit receives passes through the value obtained after opto-electronic conversion, referred to as background value.
When thering is smog to enter labyrinth and smokescope reaches detector alarm threshold value, referred to as fire alarm value.
Present back scattering labyrinth, as shown in Fig. 1, transmitter unit and receiving unit are located at tube socket central axes 10
The left and right sides, and to distribution after being in, both angle α is central optical axis angle, i.e. 0 90 ° of ＜ α ＜, optical axis center meets at one
Point A.Transmitter unit and receiving unit are overlapped along the symmetrical distribution in labyrinth central axes, tube socket central axes and labyrinth central axes.This
The labyrinth of kind structure, background value is bigger, and the difference comparsion of fire alarm value and background value is small, easy tos produce wrong report.In actual use
In order to ensure that labyrinth is with good performance, needs to reduce background value, reduces wrong report risk, improve dynamic range, it usually needs
It is made up in circuit design or software algorithm.Design difficulty increases in terms of to circuit part and signal processing, and anti-to labyrinth
Interference performance proposes requirements at the higher level.
Invention content
The application provides a kind of back scattering labyrinth that background value is small.
According in a first aspect, a kind of back scattering labyrinth, including shading wall and tube socket are provided in a kind of embodiment, in tube socket
Equipped with transmitter unit and receiving unit, transmitter unit and receiving unit are along tube socket central axes symmetry arrangement；Tube socket central axes and fan
Palace central axes are at angle β, 0 ° of 90 ° of ＜ β ＜.
Preferably, the central optical axis of the transmitter unit and the central optical axis of receiving unit are intersected on the central axes of labyrinth.
According to the back scattering labyrinth of above-described embodiment, since in the present invention, tube socket central axes have with labyrinth central axes
Certain angle.The presence of this angle can make the light that transmitter unit is sent out, the multiple reflections on shading wall, the light after reflection
Line enters finally into receiving unit.Due to the increase of order of reflection, light ray energy can gradually decay, to reduce the background in labyrinth
Value.After background value reduces, background value and the difference of fire alarm value just increase, and reduce wrong report risk.Further, make transmitter unit
The central optical axis of central optical axis and receiving unit is met on the central axes of labyrinth, ensures that the sensitizing range in labyrinth is fallen within labyrinth.
Description of the drawings
Fig. 1 is existing labyrinth structure schematic diagram；
Fig. 2 is one embodiment labyrinth structure schematic diagram of the application.
Specific implementation mode
Below by specific implementation mode combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can be without lifting an eyebrow recognize, which part feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
It can completely understand relevant operation according to the general technology knowledge of description and this field in specification.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
The major design of the present invention optics labyrinth of a smoke detector, by light path design, in no smoke condition
Under, receiving unit receives fewer optical signal, that is, makes it have smaller background value.Labyrinth is reduced from light path design
Background value.And sensitive response can be made in the case where there is smoke condition, there is wider dynamic range and sensitive response section,
It disclosure satisfy that every testing inspection of national regulations.It from the basic light path design in labyrinth, solves the problems, such as, reaches reduction background value
Purpose, ensure the consistency, stability, reliability in labyrinth.
Referring to FIG. 2, back scattering labyrinth, including shading wall 11 and tube socket 12, tube socket 12 is interior to be equipped with transmitter unit 4 and connects
Unit 3 is received, transmitter unit and receiving unit are along tube socket central axes symmetry arrangement；Tube socket central axes and labyrinth central axes at angle β,
0 ° of 90 ° of ＜ β ＜.The central optical axis 5 of transmitter unit 4 is intersected in B points with the central optical axis 6 of receiving unit 3, and B points are located in labyrinth
On axis.
In tube socket 12, transmitter unit and receiving unit be in after to distribution, i.e. 0 90 ° of ＜ α ＜.
Transmitter unit can be infrared emission unit, and receiving unit can be infrared receiver.
Light-blocking member is located at tube socket periphery, is the enclosure wall or blade with shade function, and the light participated in inside labyrinth is anti-
Ambient is penetrated and be isolated, interference of the ambient light to receiving unit is reduced.
In optics labyrinth, the infrared ray that transmitter unit is sent out is mapped on light-blocking member, in background state of value, is mainly had
Two parts are contributed.A part is primary event, and another part is multiple reflections.The material that labyrinth uses is common plastic cement material
Material, and the optical characteristics of material surface is also made of two parts.A part is mirror-reflection, and another part is diffusing reflection, minute surface
Reflection and diffusing reflection are present in by a certain percentage in the plastic surface constituent element of per unit.
In the present invention, tube socket central axes have certain angle with labyrinth central axes.The presence of this angle can be effectively sharp
With mirror-reflection, the light that transmitter unit is launched is made to enter receiving unit after light-blocking member multiple reflections.Due to reflection
The increase of number, light ray energy can gradually decay, to reduce the background value in labyrinth.
Take the labyrinth of this design, background value that can reduce by 17% or more.At the same time, as long as peripheral shading wall energy
It is enough to ensure the sensitizing range of smoke particle being wrapped in labyrinth, the contribution amount of smoke particle can be maximized and be showed.So
While reducing background value, fire alarm value is unaffected.Increase the increment section in labyrinth so that dynamic range increases.In turn
So that labyrinth is either all significantly increased to the responding ability of black smoke or white cigarette.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not limiting
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (2)
1. a kind of back scattering labyrinth, including shading wall and tube socket, tube socket is interior to be equipped with transmitter unit and receiving unit, and feature exists
In：
Transmitter unit and receiving unit are along tube socket central axes symmetry arrangement；Tube socket central axes are with labyrinth central axes at angle β, 0 ° of ＜
90 ° of β ＜.
2. back scattering labyrinth as described in claim 1, it is characterised in that：The central optical axis of the transmitter unit is single with reception
The central optical axis of member is met on the central axes of labyrinth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119043.XA CN108416967A (en) | 2018-02-06 | 2018-02-06 | A kind of back scattering labyrinth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119043.XA CN108416967A (en) | 2018-02-06 | 2018-02-06 | A kind of back scattering labyrinth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108416967A true CN108416967A (en) | 2018-08-17 |
Family
ID=63127883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810119043.XA Pending CN108416967A (en) | 2018-02-06 | 2018-02-06 | A kind of back scattering labyrinth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108416967A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110443972A (en) * | 2019-09-12 | 2019-11-12 | 深圳市泛海三江电子股份有限公司 | Labyrinth structure of smoke alarm and labyrinth background value control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987426A (en) * | 2005-12-23 | 2007-06-27 | 蚌埠依爱消防电子有限责任公司 | Vertical two-way dispersion smoke sensing detector labyrinth |
| CN200965720Y (en) * | 2006-11-14 | 2007-10-24 | 王殊 | Backward scatter optical dark chamber |
-
2018
- 2018-02-06 CN CN201810119043.XA patent/CN108416967A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987426A (en) * | 2005-12-23 | 2007-06-27 | 蚌埠依爱消防电子有限责任公司 | Vertical two-way dispersion smoke sensing detector labyrinth |
| CN200965720Y (en) * | 2006-11-14 | 2007-10-24 | 王殊 | Backward scatter optical dark chamber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110443972A (en) * | 2019-09-12 | 2019-11-12 | 深圳市泛海三江电子股份有限公司 | Labyrinth structure of smoke alarm and labyrinth background value control method |
| CN110443972B (en) * | 2019-09-12 | 2024-02-06 | 深圳市高新投三江电子股份有限公司 | Maze background value control method |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180817 |
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| RJ01 | Rejection of invention patent application after publication |