CN101275910B - Smoke detector and sampling air supplying method for smoke detector - Google Patents
Smoke detector and sampling air supplying method for smoke detector Download PDFInfo
- Publication number
- CN101275910B CN101275910B CN200810084922XA CN200810084922A CN101275910B CN 101275910 B CN101275910 B CN 101275910B CN 200810084922X A CN200810084922X A CN 200810084922XA CN 200810084922 A CN200810084922 A CN 200810084922A CN 101275910 B CN101275910 B CN 101275910B
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- fan
- smoke detector
- gas flow
- inspection cigarette
- tube
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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
-
- 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
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
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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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
In order to enable supply of a sampling air to a smoke detection portion at a stable flow velocity, the present invention provides a smoke detector including: a black box (21) including a smoke detection portion (25) having an inflow port and an outflow port; a sampling pipe (30) laid in a monitor space; a gas flow pipe (P) connected to the sampling pipe and which houses a fan (3) therein; a flow path branching portion (33) provided to the gas flow pipe on a secondary side of the fan and connected to the inflow port of the smoke detection portion; and a flow path merging portion (32) which is provided to the gas flow pipe on the secondary side of the fan and connected to the outflow port of the smoke detection portion, and at which a pressure of a fluid flowing through the gas flow pipe is lower than a fluid flowing through the gas flow pipe at the flow path branching portion.
Description
Technical field
The present invention relates to detect optically smoke detector and the sampling air supplying method thereof that swims in pollutants such as airborne cigarette.
Background technology
Detection system during as fire prevention or generation cigarette, perhaps usability smoke detector in semiconductor fabrication factory that needs certain environment to save from damage or bakery and confectionery.
Used highly sensitive smoke detecting apparatus as this smoke detector, utilize the driving of fan to attract air from guard space by stopple coupon, rayed with electron-baem spot is included in the airborne smoke particle that is attracted, by comparer obtain compared by light signal and threshold value after convert pulse signal to, measure this pulse number and measure cigarette amount (for example, No. the 3312712nd, the Japanese Gazette of Patent for Invention of reference).
In example in the past, inspection cigarette portion by camera bellows connect with fan before fluid (sampling air) applies energy primary side (air entry one side of fan) and apply energy after primary side (exhausr port one side), the pressure differential of utilizing described primary side and primary side is supplied with the sampling air to described inspection cigarette portion.
Therefore, according to fan or be arranged on the state of the filter for filtration in the pipeline, sample flow can change.If sample flow changes, because the P-Q characteristic of fan, then the pressure differential of primary side and primary side also changes, and can not supply with the sampling air to inspection cigarette portion with the flow velocity of setting, and cigarette detects so be difficult to carry out accurately.
Summary of the invention
In view of the foregoing, the objective of the invention is to accomplish and to provide the sampling of stablizing flow velocity air to inspection cigarette portion.
The invention provides a kind of smoke detector, it is characterized in that comprising: inspection cigarette portion has inflow entrance and flow export; Stopple coupon is in the monitored space that is laid in; Gas flow tube is connected with described stopple coupon, in fan is housed; Stream shunt portion is arranged in the described gas flow tube of primary side of described fan, is connected with the inflow entrance of described inspection cigarette portion; And passage confluent portion, be arranged in the described gas flow tube of primary side of described fan, be connected with the flow export of described inspection cigarette portion, the pressure of the mobile fluid in the gas flow tube of described stream shunt portion of the pressure ratio by making the fluid that flows in the gas flow tube of described passage confluent portion is low, the flow rate of fluid that makes described inspection cigarette portion is for certain, wherein, described primary side is exhausr port one side.
The present invention also provides a kind of smoke detector, it is characterized in that: in above-mentioned smoke detector, also comprise enlarged tube, this enlarged tube is the roughly cone that is connected with the exhausr port of described fan, and downstream one side broadens, described stream shunt portion, be arranged on downstream one side of described enlarged tube, supply with the sampling air to described inspection cigarette portion, described passage confluent portion from described enlarged tube, be arranged on described stream shunt portion upstream one side, from described inspection cigarette portion to described enlarged tube exhaust.
The present invention also provides a kind of smoke detector, it is characterized in that: in above-mentioned smoke detector, and the contiguous described fan setting of described passage confluent portion.
The invention provides a kind of sampling air supplying method of smoke detector, it is characterized in that, use above-mentioned smoke detector, wherein, the sampling air supplying method of described smoke detector is the pressure differential of described fluid of utilizing the primary side of described fan, and the part of described fluid is imported in the described inspection cigarette portion from described stream shunt portion.
The present invention is owing to have above formation, so can utilize the pressure differential of the fluid that between described stream shunt portion and described passage confluent portion, produces, the sampling part of air that flows is imported from described stream shunt portion examine in the cigarette portion, and turn back in the described gas flow tube from passage confluent portion by described inspection cigarette portion.Therefore, can offer inspection cigarette portion to the sampling air with certain flow velocity, detect thereby can carry out cigarette exactly.
Description of drawings
Fig. 1 is the pie graph of expression first embodiment of the invention.
Fig. 2 is the longitudinal sectional view of expression first embodiment of the invention.
Fig. 3 is the front view (FV) of the fan of expression second embodiment of the invention.
Fig. 4 is the longitudinal sectional view of expression second embodiment of the invention.
Fig. 5 is the longitudinal sectional view of expression third embodiment of the invention.
Fig. 6 is the longitudinal sectional view of expression four embodiment of the invention.
Embodiment
With Fig. 1, Fig. 2 first embodiment of the present invention is described.
As shown in Figure 1, smoke detector 1 comprises: cigarette detecting unit 2 has camera bellows 21; Fan 3 is to air (sampling air) SA of these cigarette detecting unit 2 conveyings as detected object; Pipe arrangement 4 is as air flue; Light-emitting component 11 is configured in the cigarette detecting unit 2; Photo detectors such as photodiode 12; Air flow sensor 13 is measured the flow of described fan 3 or air; Power supply unit 14 is to these air flow sensor 13 supply powers; And fire detection unit 15, be connected with photo detector 12.
Below cigarette detecting unit 2 is described, in the optics shell 21 of general cylindrical shape shape, dispose and for example send ultrared light-emitting component 11 and be positioned at parasitic light portion 22 with this light-emitting component 11 relative positions, be provided with between the two: collector lens 24 gathers the light that sends the curved face part that is arranged on the light collector 23 in the parasitic light portion 22; Inspection cigarette portion 25 passes through air; And photo detector 12 etc.In addition, with suitable aperture (aperture) 26, the restriction irradiates light of being arranged at intervals with.The sampling air SA that filters with filtrator 5 imports to described inspection cigarette portion 25 by described pipe arrangement 4.
The light collector 23 of first embodiment forms conical shaped.Incide the light L (omit diagram) of parasitic light portion 22, incide the curved surface of light collector 23 and through repeatedly reflection.Therefore and the reflection light quantity of light L all produces decay in each reflection of curved surface, can not be diffused into inspection cigarette portion 25 1 sides, in other words be exactly can not be diffused into photo detector 12 within sweep of the eye as diffused light.
In addition, fire detection unit 15 comprises: amplifying circuit, the output signal S of amplification photo detector 12; A/D converter is converted to the detection level to this amplifying circuit; And comparator circuit, reach pre-set threshold and be judged to be fire when above detecting level; Carry out Comprehensive Control with CPU.
Below the cigarette of explanation first embodiment detects action.
Under normal condition, flow from the top down in inspection cigarette portion 25 from the air that monitored space attracts with fan 3.If clean air, light L is in the 25 not scatterings of inspection cigarette portion, and light L incides in the parasitic light portion 22 under the state of optically focused and the state at the curved surface of light collector 23 in focus.
Light L repeatedly reflects at light collector 23, and the decay of corresponding order of reflection.Therefore, parasitic light is not accepted by photo detector 12, and output signal S is a low level, can not be judged to be fire.
When fire took place, smoke particle swam in the air of attraction, when with light L irradiation, produced scattered light in inspection cigarette portion 25.Accept scattered light with photo detector 12, and derive the output signal S of the light income of corresponding described scattered light.Output signal S is provided for fire detection unit 25 and carries out described signal Processing, by showing or the acoustic notifications breaking out of fire.
Light L for by inspection cigarette portion 25 because of carrying out reflection same as described above with light collector 23, so decay, can not be accepted as parasitic light.Therefore, even when fire takes place, the S/N of output signal is higher than also, can carry out fire exactly with high sensitivity and high precision and judge.
Primary side at the fan 3 of gas flow tube P is provided with diffusion part 20.This diffusion part 20 downstreams one side broadens, for example be to form the roughly enlarged tube of cone (fan diffuser) such as taper shape, be provided with passage confluent portion 32 in base end part 20a one side, in addition, leading section 20b one side being positioned at described passage confluent portion 32 downstreams, one side is provided with stream shunt portion 33.
In addition, fan also can be an aerofoil fan.It can also be the fan that exchanges (AC) power drives.
Described diffusion part 20 is at the diameter D1 of passage confluent portion 32, and than little at the diameter D2 of described stream shunt portion 33, but the bore of described two parts 32,33 is identical.Can select allocation position of the size of described diameter D1, D2 and stream shunt portion 33, passage confluent portion 32 etc. as required aptly.In addition, what diffusion part (enlarged tube) 20 exemplified is conical, but also can be pyramid.
In the primary side of described fan 3, be provided with the camera bellows 21 of cigarette detecting unit 2, the inflow entrance of the inspection cigarette portion 25 of this camera bellows 21 is connected with described stream shunt portion 33, and in addition, its flow export is connected with described passage confluent portion 32.This cigarette detecting unit 2 has used the formation different with Fig. 1 for convenience of description, but its principle is identical.
Then, the action to first embodiment describes.
When drive fan 3, by stopple coupon (omitting diagram) the air A of monitored space is sucked gas flow tube P, and by diffusion part 20 discharges, at this moment, the flow velocity of the passage confluent portion 32 in described diffusion part 20 is with different at the flow velocity of stream distributary division 33, so produce pressure differential between two parts.
That is, according to Bei Nuli (Bernoulli) theorem: V
2/ 2g+Z+p/ γ=definite value (V: speed; Z: highly; P: pressure; γ: volume density; G: acceleration of gravity), by flow velocity V=4Q (flow)/D
2π, the big flow velocity of internal diameter is low as can be known, so obtain the relation of flow velocity V2 of the flow velocity V1＞stream shunt portion 33 of passage confluent portion 32.Therefore, for the pressure differential Δ p of inspection cigarette portion 25, i.e. the pressure p 1 of the pressure p 2-passage confluent portion 32 of stream shunt portion 33 obtains (p2-p1)=γ * (V1 according to the Bei Nuli theorem
2-V2
2)/2g.
Owing to produce this pressure differential, the smoke particle that is comprised among the sampling air SA that in diffusion part 20, flows, be drawn into the inflow entrance of inspection cigarette portion 25 by stream shunt portion 33, when being produced scattered light by the laser radiation of light-emitting component 11, in this inspection cigarette portion 25, advance, in passage confluent portion 32 returns diffusion part 20.
Under the certain situation of sample flow, the pressure differential Δ p between described two parts 32,33 is definite value always, so can offer inspection cigarette portion 25 to sampling air SA with certain flow velocity.
With Fig. 3, Fig. 4 second embodiment of the present invention is described, the Reference numeral identical with Fig. 1, Fig. 2, its title is also identical with function.
The difference of second embodiment and first embodiment is, substitute diffusion part 20 as the pressure differential generation device, and according in the primary side of fan 3 from the periphery of the rotor 3f of fan 3 apart from difference, in the position that produces pressure differential described stream shunt portion and passage confluent portion are set.
Promptly, as shown in Figure 4, by suction tube (gas flow tube) P1 the stopple coupon 30 that is configured in the monitor area is connected with the air entry 3a of fan 3, gas exhaust duct (gas flow tube) P2 is set, connect gathering in the rearward end of this gas exhaust duct P2 and manage P3 in the primary side of this fan 3.Near this gas exhaust duct P2, camera bellows 21 is set.
The flow export of the inspection cigarette portion 25 of camera bellows 21 is connected with passage confluent portion 32, and this passage confluent portion 32 is arranged on the position near the rotor 3f periphery of described fan 3, and the bottom surface 21a that for example is arranged on than camera bellows 21 more leans on last place.The position of described passage confluent portion 32 is with the periphery near the rotor 3f of fan 3, and flow velocity accelerates, and hydrodynamic pressure reduces.
In addition, the inflow entrance of described inspection cigarette portion 25 is connected with stream shunt portion 33, this stream shunt portion 33 be arranged on gas exhaust duct P2 rear end one side, be downstream one side of described passage confluent portion 32, away from the periphery of the rotor 3f of fan 3.The position of described stream shunt portion 33 becomes far away with the periphery of the rotor 3f of distance fan 3, and flow velocity is slack-off, and hydrodynamic pressure rises.Therefore, can concern by the position of stream shunt portion 33 and passage confluent portion 32 and adjust pressure differential.
In second embodiment, by the rotation of fan 3, attract air A in the monitored space from the attraction mouth 34 of stopple coupon 30, this air A flows into gas exhaust duct P2 by suction tube P1.
At this moment, the peripheral speed V of fan 3 is:
V=revolution r * fan outer diameter D * π
Flow velocity V1 apart from the passage confluent portion 32 periphery distance R 1, the next-door neighbour of the rotor 3f of fan 3 is:
V1＝V
Be positioned at apart from the flow velocity V2 of periphery distance R 2 positions (stream shunt portion 33) of the rotor 3f of fan 3 and be:
V2=coefficient of viscosity μ * V1 (coefficient of viscosity of air＜1).
Therefore, there is current difference in V1＞V2, so produce pressure differential according to the Bei Nuli theorem, sampling air SA imports the inflow entrance of inspection cigarette portion 25 from stream shunt portion 33.And the smoke particle in being included in this sampling air SA is produced in the scattered light by the light beam irradiates that penetrates from light-emitting component 11, is discharged to passage confluent portion 32 from flow export.
In second embodiment, if the velocity of rotation of fan 3 is certain, current difference, promptly pressure differential is also certain substantially, then can import inspection cigarette portion 25 to sampling air SA with stable speed.In addition, if inspection cigarette portion 25 be arranged on fan 3 near, then can make the device integral miniaturization.
With Fig. 5 the 3rd embodiment of the present invention is described, the Reference numeral identical with Fig. 4, its title is also identical with function.
The difference of the 3rd embodiment and second embodiment is, is provided with filtrator 31 in stream shunt portion 33, removes the foreign matters such as dust among the sampling air SA.With this filtrator 31, can supply with to inspection cigarette portion 25 and only contain the sampling air SA of smoke particle, detect so can carry out cigarette more accurately.
With Fig. 6 the 4th embodiment of the present invention is described, the Reference numeral identical with Fig. 4, its title is also identical with function.
The difference of the 4th embodiment and second embodiment (Fig. 4) is that the position of passage confluent portion 32 is located at the below of the bottom surface 21a of camera bellows 21, that is, compare with above-mentioned embodiment, and passage confluent portion 32 is arranged on more downstream one side of the rotation direction of fan 3.
The flow velocity of the rotor 3f periphery of contiguous this fan 3, as long as on same circumferential position, flow velocity is just identical, so can be arranged on optional position on this circumference to passage confluent portion 32.In the 4th embodiment, can make the flow path configuration of sampling air SA importing inspection cigarette portion 25 simpler than second embodiment.
Claims (4)
1. smoke detector is characterized in that comprising:
Inspection cigarette portion has inflow entrance and flow export;
Stopple coupon is in the monitored space that is laid in;
Gas flow tube is connected with described stopple coupon, in fan is housed;
Stream shunt portion is arranged in the described gas flow tube of primary side of described fan, is connected with the inflow entrance of described inspection cigarette portion; And
Passage confluent portion, be arranged in the described gas flow tube of primary side of described fan, be connected with the flow export of described inspection cigarette portion, the pressure of the mobile fluid in the gas flow tube of described stream shunt portion of the pressure ratio by making the fluid that flows in the gas flow tube of described passage confluent portion is low, the flow rate of fluid that makes described inspection cigarette portion is for certain, wherein, described primary side is exhausr port one side.
2. smoke detector according to claim 1 is characterized in that:
Described smoke detector also comprises enlarged tube, and this enlarged tube is the roughly cone that is connected with the exhausr port of described fan, and downstream one side broadens,
Described stream shunt portion is arranged on downstream one side of described enlarged tube, supplies with the sampling air from described enlarged tube to described inspection cigarette portion,
Described passage confluent portion is arranged on described stream shunt portion upstream one side, from described inspection cigarette portion to described enlarged tube exhaust.
3. smoke detector according to claim 1 is characterized in that:
The contiguous described fan setting of described passage confluent portion.
4. the sampling air supplying method of a smoke detector is characterized in that,
Use the described smoke detector of claim 3, wherein,
The sampling air supplying method of described smoke detector is the pressure differential of described fluid of utilizing the primary side of described fan, and the part of described fluid is imported in the described inspection cigarette portion from described stream shunt portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-091276 | 2007-03-30 | ||
| JP2007091276A JP4932567B2 (en) | 2007-03-30 | 2007-03-30 | Smoke detector and sampling air supply method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101275910A CN101275910A (en) | 2008-10-01 |
| CN101275910B true CN101275910B (en) | 2011-06-08 |
Family
ID=39535800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810084922XA Active CN101275910B (en) | 2007-03-30 | 2008-03-07 | Smoke detector and sampling air supplying method for smoke detector |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1975896B1 (en) |
| JP (1) | JP4932567B2 (en) |
| KR (1) | KR101391550B1 (en) |
| CN (1) | CN101275910B (en) |
| AU (1) | AU2008201308B2 (en) |
| DE (1) | DE602008001120D1 (en) |
| TW (1) | TWI437513B (en) |
Families Citing this family (16)
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|---|---|---|---|---|
| US8098166B2 (en) * | 2009-04-23 | 2012-01-17 | Honeywell International Inc. | Variable air speed aspirating smoke detector |
| US9235970B2 (en) * | 2009-06-05 | 2016-01-12 | Xtralis Technologies Ltd | Gas detector for use with an air sampling particle detection system |
| JP5280347B2 (en) * | 2009-12-17 | 2013-09-04 | 能美防災株式会社 | Photoelectric smoke detector |
| CN101763708B (en) * | 2009-12-28 | 2012-01-18 | 公安部沈阳消防研究所 | Wind pipe smoke-sensing fire detector |
| CN101958032B (en) * | 2010-09-27 | 2012-05-23 | 江苏大学 | Wireless sensor smoke detection device for fire protection |
| US9140646B2 (en) | 2012-04-29 | 2015-09-22 | Valor Fire Safety, Llc | Smoke detector with external sampling volume using two different wavelengths and ambient light detection for measurement correction |
| US8907802B2 (en) | 2012-04-29 | 2014-12-09 | Valor Fire Safety, Llc | Smoke detector with external sampling volume and ambient light rejection |
| US8952821B2 (en) | 2012-04-29 | 2015-02-10 | Valor Fire Safety, Llc | Smoke detector utilizing ambient-light sensor, external sampling volume, and internally reflected light |
| CN103063614A (en) * | 2013-01-04 | 2013-04-24 | 吉林大学 | Laser type extinction smoke meter system for measuring smoke intensity of tail gas of diesel engine |
| JP6407295B2 (en) | 2013-10-30 | 2018-10-17 | ヴァラー ファイヤー セーフティー， エルエルシー | Smoke detector with external sampling volume and ambient light rejection |
| CN108837651B (en) * | 2018-06-24 | 2020-11-13 | 江苏兰丰环保科技有限公司 | Desulfurization denitration dust removal coprocessing device |
| CN109030295A (en) * | 2018-08-30 | 2018-12-18 | 安徽乐锦记食品有限公司 | A kind of bread processing anomaly alarming device smog extraction detection device |
| US11506586B2 (en) | 2020-08-17 | 2022-11-22 | Carrier Corporation | Photoelectric smoke sensor tube |
| CN115235963A (en) * | 2022-05-25 | 2022-10-25 | 中国船舶重工集团公司第七0三研究所 | Self-correcting linear air suction type smoke detector |
| CN115240358A (en) * | 2022-05-25 | 2022-10-25 | 中国船舶重工集团公司第七0三研究所 | A formula of breathing in smoke is felt and is surveyed structure for smog concentration detection |
| CN117746567B (en) * | 2024-02-20 | 2024-04-26 | 四川千页科技股份有限公司 | Energy storage power station composite fire detection system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5103212A (en) * | 1989-07-03 | 1992-04-07 | Worcester Polytechnic Institute | Balanced fluid flow delivery system |
| CN1186232A (en) * | 1996-10-24 | 1998-07-01 | 彼特威公司 | Aspirated detector |
| GB2347541A (en) * | 1999-03-04 | 2000-09-06 | Pittway Corp | Smoke detector for a duct |
| CN1485609A (en) * | 2002-08-22 | 2004-03-31 | ��֪����ʽ���� | Electrophoretic apparatus,electronic instrument |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3678487A (en) * | 1971-02-08 | 1972-07-18 | Environment One Corp | Multi-zone incipient or actual fire and/or dangerous gas detection system |
| JPS5851392A (en) * | 1981-09-24 | 1983-03-26 | Fujitsu Ltd | File copying system |
| JP3312712B2 (en) | 1995-01-31 | 2002-08-12 | ホーチキ株式会社 | Optimal threshold setting method for high-sensitivity smoke detector |
| JP3648307B2 (en) * | 1995-11-24 | 2005-05-18 | 日本フエンオール株式会社 | Smoke detection system |
-
2007
- 2007-03-30 JP JP2007091276A patent/JP4932567B2/en active Active
-
2008
- 2008-02-27 KR KR1020080017722A patent/KR101391550B1/en not_active IP Right Cessation
- 2008-03-07 CN CN200810084922XA patent/CN101275910B/en active Active
- 2008-03-17 TW TW097109372A patent/TWI437513B/en not_active IP Right Cessation
- 2008-03-20 AU AU2008201308A patent/AU2008201308B2/en not_active Ceased
- 2008-03-28 EP EP08251196A patent/EP1975896B1/en not_active Not-in-force
- 2008-03-28 DE DE602008001120T patent/DE602008001120D1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5103212A (en) * | 1989-07-03 | 1992-04-07 | Worcester Polytechnic Institute | Balanced fluid flow delivery system |
| CN1186232A (en) * | 1996-10-24 | 1998-07-01 | 彼特威公司 | Aspirated detector |
| GB2347541A (en) * | 1999-03-04 | 2000-09-06 | Pittway Corp | Smoke detector for a duct |
| CN1485609A (en) * | 2002-08-22 | 2004-03-31 | ��֪����ʽ���� | Electrophoretic apparatus,electronic instrument |
Non-Patent Citations (1)
| Title |
|---|
| JP特開平8-202970A 1996.08.09 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE602008001120D1 (en) | 2010-06-17 |
| EP1975896A3 (en) | 2009-03-18 |
| KR20080089167A (en) | 2008-10-06 |
| TWI437513B (en) | 2014-05-11 |
| AU2008201308B2 (en) | 2011-07-28 |
| EP1975896B1 (en) | 2010-05-05 |
| KR101391550B1 (en) | 2014-05-07 |
| CN101275910A (en) | 2008-10-01 |
| JP2008250684A (en) | 2008-10-16 |
| JP4932567B2 (en) | 2012-05-16 |
| TW200901093A (en) | 2009-01-01 |
| AU2008201308A1 (en) | 2008-10-16 |
| EP1975896A2 (en) | 2008-10-01 |
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