CN110261314A - Smoke detection device for range hood, range hood and smoke detection method of range hood - Google Patents
Smoke detection device for range hood, range hood and smoke detection method of range hood Download PDFInfo
- Publication number
- CN110261314A CN110261314A CN201910538060.1A CN201910538060A CN110261314A CN 110261314 A CN110261314 A CN 110261314A CN 201910538060 A CN201910538060 A CN 201910538060A CN 110261314 A CN110261314 A CN 110261314A
- Authority
- CN
- China
- Prior art keywords
- range hood
- flue gas
- gas inspection
- inspection device
- oil smoke
- 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
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 64
- 238000001514 detection method Methods 0.000 title claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 59
- 239000003546 flue gas Substances 0.000 claims description 59
- 238000007689 inspection Methods 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 18
- 230000004044 response Effects 0.000 claims description 12
- 235000019504 cigarettes Nutrition 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 230000005622 photoelectricity Effects 0.000 description 3
- 208000033748 Device issues Diseases 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a smoke detection device for a range hood, which comprises a main shell, a bottom shell provided with a plurality of first air circulation holes, a photoelectric emission tube and a photoelectric receiving tube, wherein a cavity for installing the photoelectric emission tube and the photoelectric receiving tube is formed after the main shell and the bottom shell are assembled; the invention also discloses a range hood. The photoelectric emission tubes and the photoelectric receiving tubes are arranged in the rectangular main shell in a mutually staggered manner, so that the whole structure of the whole smoke detection device is rectangular, the detection range of oil smoke detection is effectively enlarged, the detection precision of the oil smoke is improved, and the problem that the oil smoke detection is not accurate when a user uses a cooker on one side is solved.
Description
Technical field
The invention belongs to range hood technical fields, and in particular to a kind of flue gas inspection device for range hood is inhaled
Kitchen ventilator and its flue gas inspection method.
Background technique
Being currently, there are more serious problem in the existing range hood using automatic control mode is, what is used
In the process, the detection dress that the oil smoke part for entering air inlet through smoke machine air inlet can enter for realizing automatic control
In setting, after the long-time use of range hood, the oil smoke of accumulation can circuit unit inside serious pollution detection device, this meeting
Serious influence is caused on detection device, causes the reduction of detection device detection accuracy, and then influences range hood and automatically controls
Realization；And current Smoke Detection sensor detection zone is all smaller, can not cover biggish area of detection, range hood
In use, since kitchen range most of the time only use on one side, smoke machine inside smoke is caused to be distributed and uneven, zonule smog inspection
Survey will cause the phenomenon that accuracy decline.
In addition, the air force control of range hood is that range hood operates most frequent function.Most of the time, user
It is all when culinary art, can inevitably culinary art be caused if carrying out manual switching operation at this time by needing to switch over gear operation
Interference, especially to the unfamiliar people of culinary art.It is exactly that user often forgets about switching gear in time there are also a kind of more common situation
, when culinary art is converted to big oil smoke situation by small oil smoke situation, forget to switch gear in time, it is largely outer thus to will cause oil smoke
It overflows, so that pollution kitchen.The consequence of such case is the most serious, thus will lead to user to the usage experience of range hood not
It is good.So present many range hood users, in order to avoid this kind of situation, the coping style taken all is in smoke machine
In use process, range hood is opened to the maximum into always gear；Although this can be avoided the oil smoke of worst largely excessive situation
Generation, but also result in range hood energy consumption increase, noise problem larger always.
Summary of the invention
In view of this, being solved the main purpose of the present invention is to provide a kind of flue gas inspection device for range hood
Flue gas inspection device detection range is small in the prior art, when using the kitchen range on one side, is easy to cause the smoke distribution uneven,
The problem of to cause detection accuracy to decline；The object of the invention is also to provide the range hoods comprising the flue gas inspection device
And its flue gas inspection method.
The technical scheme adopted by the invention is that: a kind of flue gas inspection device for range hood, including main casing, set
It is equipped with bottom case, photoemission cell and the photoelectric receiving tube of several the first air-flow through-holes, after the main casing and bottom case assemble
It is formed with the cavity for installing the photoemission cell and the photoelectric receiving tube, the photoemission cell and photoelectric receiving tube
Being respectively provided at least is two, and the setting that two photoemission cells and two photoelectric receiving tubes intermesh is in main casing
It is on body and within the cavity.
Preferably, the main casing includes main casing ontology, fixed plate and light cylinder, and the fixed plate is arranged in main casing ontology
Cavity in, the light cylinder is installed in fixed plate, and two photoemission cells and two photoelectric receiving tubes are mutual
It is staggered to be arranged in fixed plate and be located in light cylinder.
Preferably, the main casing ontology is configured to rectangle.
Preferably, photoelectric tube mounting hole is provided in the fixed plate, the photoemission cell and photoelectric receiving tube are solid
It being located in photoelectric tube mounting hole, each photoelectric tube mounting hole is along being provided with the second air-flow through-hole one week, and described second
Air-flow through-hole also is located in light cylinder.
Preferably, the launch angle of the photoemission cell is greater than 60 degree.
Preferably, which further includes filter, and the filter is arranged on bottom case and the first gas of covering
Recirculation hole.
Preferably, it is provided with several card slots on the side wall of the main casing, has the one side of filter to be arranged on the bottom case
Have with the same number of buckle of several card slots, the card slot with snap fit attachment.
Second technical solution of the invention is achieved in that a kind of range hood, including range hood ontology, above-mentioned
Flue gas inspection device, the flue gas inspection device is arranged horizontally at the lower section in range hood ontology on cabinet door-plate
At position and stretch in the intrinsic oil smoke flow channel of range hood.
Preferably, blower fan system, the oil smoke flow channel and blower fan system are additionally provided in the range hood ontology
It is connected.
Third technical solution of the invention is achieved in that a kind of flue gas inspection applied to above-mentioned range hood
Method, this method comprises:
Range hood is opened, whether has oil in the flue gas inspection device detection oil smoke flow channel described in real time
Cigarette；
If there is oil smoke, the light that the photoemission cell in the flue gas inspection device issues is after smoke particle is spread
Into the photoelectric receiving tube, the photoelectric receiving tube generates response voltage and response voltage signal is fed back to control
Oil smoke is discharged according to the compressor flow in the big minor adjustment range hood of response voltage in device, the controller.
Preferably, this method further include:
Range hood is opened, whether has oil smoke in the real-time acquisition testing oil smoke flow channel of the flue gas inspection device；
If the light that the photoemission cell in the flue gas inspection device issues does not enter photoelectric receiving tube without oil smoke,
I.e. photoelectric receiving tube does not generate response voltage, and the controller does not adjust the compressor flow in range hood.
Compared with prior art, the present invention is by setting that photoemission cell and photoelectric receiving tube intermesh rectangular
In the main casing of the bodily form, so that it is cuboid that the overall structure of entire flue gas inspection device, which is in, both effectively increase in this way
Detection range when oil smoke is detected, and improves the detection accuracy of oil smoke, while also avoiding using the kitchen range on one side as user
When, oil smoke detects not accurate problem.
Detailed description of the invention
Fig. 1 is a kind of explosive view for flue gas inspection device for range hood that the embodiment of the present invention 1 provides.
Fig. 2 is a kind of cross-section structure signal for flue gas inspection device for range hood that the embodiment of the present invention 1 provides
Figure；
Fig. 3 is the solid of outer housing in a kind of flue gas inspection device for range hood of the offer of the embodiment of the present invention 1
Structural schematic diagram one；
Fig. 4 is the solid of outer housing in a kind of flue gas inspection device for range hood of the offer of the embodiment of the present invention 1
Structural schematic diagram two；
Fig. 5 is that the structure of bottom case in a kind of flue gas inspection device for range hood of the offer of the embodiment of the present invention 1 is shown
It is intended to；
Fig. 6 is the structure of filter in a kind of flue gas inspection device for range hood of the offer of the embodiment of the present invention 1
Schematic diagram；
Fig. 7 is a kind of structural schematic diagram one for range hood that the embodiment of the present invention 2 provides；
Fig. 8 is a kind of structural schematic diagram two for range hood that the embodiment of the present invention 2 provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the present invention, it should be clear that, term " vertical ", " transverse direction ", " longitudinal direction ", "front", "rear",
The indicating positions such as "left", "right", "upper", "lower", "horizontal" or positional relationship are to be based on the orientation or positional relationship shown in the drawings,
It is intended merely to facilitate the description present invention, rather than means that signified device or element must have distinctive orientation or position
It sets, therefore is not considered as limiting the invention.
A kind of flue gas inspection device for range hood that the embodiment of the present invention 1 provides, as shown in Figure 1 and Figure 2, including
Main casing 10, the bottom case 11 for being provided with several the first air-flow through-holes 111, photoemission cell 12 and photoelectric receiving tube 13, it is main
Shell 10 and bottom case 11 are formed with the cavity for installing photoemission cell 12 and the photoelectric receiving tube 13, the light after assembling
It is two that electric transmitting tube 12 and photoelectric receiving tube 13, which are respectively provided at least, two photoemission cells 12 and two photoelectricity
The setting that reception pipe 13 intermeshes is on main casing 10 and within the cavity；Wherein, photoemission cell 12 and photoelectric receiving tube
13 specific setting number can be changed according to the specification size of range hood, and in the present embodiment example, photoemission cell 12 is
Two, photoelectric receiving tube 13 is three.
Further, as shown in Figure 3, Figure 4, main casing 10 includes main casing ontology 101, fixed plate 102 and light cylinder 103,
Fixed plate 102 is arranged in the cavity of main casing ontology 101, and light cylinder 103 is installed in fixed plate 102, two photoemission cells
12 and the setting that intermeshes of two photoelectric receiving tubes 13 in fixed plate 102 and be located in light cylinder 103, wherein main casing sheet
Body 101 is configured to rectangle.
After adopting the above scheme, by setting that photoemission cell 12 and photoelectric receiving tube 13 intermesh in cuboid
In the main casing 10 of shape, so that it is cuboid that the overall structure of entire flue gas inspection device, which is in, both effectively increase in this way
Detection range when oil smoke is detected, and improves the detection accuracy of oil smoke, while also avoiding using the kitchen range on one side as user
When, oil smoke detects not accurate problem.In addition, by the way that light cylinder 103 is arranged in fixed plate 102, and by photoemission cell 12
It is arranged in light cylinder 103 with photoelectric receiving tube 13, effectively to the transmitting light and photoelectric receiving tube of photoemission cell 12
13 reception light is defined, and can preferably realize the accuracy of entire detection device in this way, in addition, light cylinder 103 is used
It is gone in the hair that photoemission cell 12 emits light signal and receives the irreflexive light signal of smog for photoelectric receiving tube 13,
Light cylinder 103 also takes on the effect of air-flow through-hole simultaneously.Further, photoelectric tube mounting hole is provided in fixed plate 102
1021, photoemission cell 12 and photoelectric receiving tube 13 are installed in photoelectric tube mounting hole 1021, each photoelectric tube mounting hole
1021 along the second air-flow through-hole 1022 is provided with one week, and the second air-flow through-hole 1022 also is located in light cylinder 103, wherein
Photoelectric tube mounting hole 1021 is preferably cylindric；Each photoelectric tube mounting hole 1021 is along one week at least provided with two the second gas
Recirculation hole 1022, preferably four；In addition, by the way that the second air-flow through-hole 1022 is arranged in fixed plate 102 and is located at light
In cylinder 103, and each light cylinder 103 is correspondingly arranged on outlet gap aperture 1031, and outlet gap aperture 1031 is effectively prevented
Stop the flue gas in oil smoke flow channel 23 and flows backward to pollution photoemission cell 12 and photoelectric receiving tube 13 in light cylinder 103, with
Just the problem of influencing testing result.
Further, the launch angle of photoemission cell 12 is greater than 60 degree.
Further, as shown in Fig. 1, Fig. 6, which further includes filter 14, and filter 14 is arranged the bottom of at
On shell 11 and cover the first air-flow through-hole 111.
After adopting the above scheme, by the way that the second air-flow through-hole 1022 is arranged in light cylinder 103, in this way, when smoke machine starts,
Due to the presence of negative pressure, kitchen gas flows into first on bottom case from the Decorative Cover 23 of range hood and the gap of cabinet door-plate 21
Air-flow through-hole 111 becomes pure air by the filtering of filter 14, and then inflow main casing ontology 101 and bottom case 11 are formed
In separate space, then flowed by the second air-flow through-hole 1022 on main casing ontology 101 from the outlet gap aperture 1031 of light cylinder 103
Out, into box house；In this way in smoke machine operational process, it is ensured that flue gas not can enter columned photoelectricity mounting hole
In 1021, and photoemission cell 12 and photoelectric receiving tube 13 are installed in the columned photoelectricity mounting hole where in light cylinder
In 1021, to ensure that photoemission cell 12 and photoelectric receiving tube 13 will not be contaminated.
Further, as shown in Figure 4, Figure 5, several card slots 1011, bottom case 11 are provided on the side wall of main casing ontology 101
On there is being provided on one side for filter 14 112 to match with the same number of buckle 112 of several card slots 1011, card slot 1011 with buckling
Close connection.
Further, mounting hole 114 and the through-hole 113 for wearing data line are additionally provided on bottom case 11.
A kind of range hood that the embodiment of the present invention 2 provides, as shown in fig. 7, comprises range hood ontology 2,1 institute of embodiment
The flue gas inspection device 1 stated, flue gas inspection device 1 are arranged horizontally in range hood ontology 2 on cabinet door-plate 21
It lower position and stretches in the oil smoke flow channel 23 in range hood ontology 2.
Further, as shown in figure 8, being additionally provided with blower fan system 22 in range hood ontology 2, oil smoke flow channel 23 with
Blower fan system 22 is connected.By the way that flue gas inspection device 1 described in embodiment 1 to be applied in range hood, in use, can
So that the oil smoke in oil smoke flow channel is discharged in time, to be effectively reduced oil smoke in flue gas inspection device 1 of the present invention
And gathered on other component in range hood, the precision of flue gas inspection is not only increased in this way, and extends the present invention
The service life of flue gas inspection device 1 and range hood.
A kind of flue gas inspection method applied to range hood as described in example 2 that the embodiment of the present invention 3 provides, the party
Method includes:
Range hood is opened, whether is had in the flue gas inspection device 1 detection oil smoke flowing logical 23 described in real time
Oil smoke；
If there is oil smoke, the light that the photoemission cell 12 in flue gas inspection device 1 issues spreads laggard by smoke particle
Enter the photoelectric receiving tube 13, photoelectric receiving tube generates response voltage and response voltage signal is fed back to controller, described
Oil smoke is discharged according to the compressor flow in the big minor adjustment range hood of response voltage in controller.
This method further include:
Range hood is opened, whether has oil in the real-time acquisition testing oil smoke flow channel 23 of flue gas inspection device 1
Cigarette；
If the light that the photoemission cell 12 in the flue gas inspection device 1 issues does not enter opto-electronic receiver without oil smoke
Pipe 13, i.e. photoelectric receiving tube 13 do not generate response voltage, and the controller does not adjust the compressor flow in range hood.
After above-mentioned control method, user is realized when culinary art, it, can be certainly without switching over gear
It is dynamic that oil smoke is timely discharged, it is largely excessive so as to avoid oil smoke, so that the problem of pollution kitchen；Fume-exhausting is decreased simultaneously
The energy consumption of machine and the noise of range hood.
The present invention passes through the main casing that cuboid is arranged in that photoemission cell 12 and photoelectric receiving tube 13 intermesh
In ontology 101, so that it is cuboid that the overall structure of entire flue gas inspection device 1, which is in, detection is both effectively increased in this way
Detection range when oil smoke, and the detection accuracy of oil smoke is improved, while also avoiding when user uses the kitchen range on one side, oil
Cigarette detects not accurate problem；In addition, by the way that flue gas inspection device 1 of the present invention is applied in range hood, in use, can
So that the oil smoke in oil smoke flow channel is discharged in time, to be effectively reduced oil smoke in flue gas inspection device 1 of the present invention
And gathered on other component in range hood, the precision of flue gas inspection is not only increased in this way, and extends the present invention
The service life of flue gas inspection device 1 and range hood.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of flue gas inspection device for range hood, which is characterized in that including main casing (10), be provided with several
Bottom case (11), photoemission cell (12) and the photoelectric receiving tube (13) of one air-flow through-hole (111), the main casing (10) and bottom
The cavity for installing the photoemission cell (12) and the photoelectric receiving tube (13), the light are formed with after shell (11) assembly
It is two that electric transmitting tube (12) and photoelectric receiving tube (13), which are respectively provided at least, two photoemission cells (12) and two institutes
It is on main casing (10) and within the cavity to state the setting that photoelectric receiving tube (13) intermeshes.
2. a kind of flue gas inspection device for range hood according to claim 1, which is characterized in that the main casing
It (10) include main casing ontology (101), fixed plate (102) and light cylinder (103), the fixed plate (102) is arranged in main casing ontology
(101) in cavity, the light cylinder (103) is installed on fixed plate (102), two photoemission cells (12) and two
The setting that the photoelectric receiving tube (13) intermeshes is on fixed plate (102) and is located in light cylinder (103).
3. a kind of flue gas inspection device for range hood according to claim 2, which is characterized in that the main casing sheet
Body (101) is configured to rectangle.
4. a kind of flue gas inspection device for range hood according to claim 2 or 3, which is characterized in that described solid
It is provided on fixed board (102) photoelectric tube mounting hole (1021), the photoemission cell (12) and photoelectric receiving tube (13) are fixed
In the photoelectric tube mounting hole (1021), each photoelectric tube mounting hole (1021) is along being provided with the second air-flow through-hole one week
(1022), the second air-flow through-hole (1022) is connected with the light cylinder (103).
5. a kind of flue gas inspection device for range hood according to claim 1,2 or 3, which is characterized in that described
The launch angle of photoemission cell (12) is greater than 60 degree.
6. a kind of flue gas inspection device for range hood according to claim 1, which is characterized in that the flue gas inspection
Device further includes filter (14), and the filter (14) is arranged on bottom case (11) and the first air-flow through-hole (111) of covering.
7. a kind of flue gas inspection device for range hood according to claim 2 or 3, which is characterized in that the master
It is provided with several card slots (1011) on the side wall of shell (101), has being provided on one side for filter (14) on the bottom case (11)
With the same number of buckle (112) of several card slots (1011), the card slot (1011) and buckle (112) are cooperatively connected.
8. a kind of range hood, which is characterized in that including range hood ontology (2), as described in claim 1-7 any one
Flue gas inspection device (1), the flue gas inspection device (1) are arranged horizontally at cabinet door-plate in range hood ontology (2)
(21) it lower position on and stretches in the oil smoke flow channel (23) in range hood ontology (2).
9. a kind of flue gas inspection method applied to range hood according to any one of claims 8, which is characterized in that this method comprises:
Range hood is opened, the flue gas inspection device (1) the detection oil smoke described in real time flows whether have in logical (23) road
Oil smoke；
If there is oil smoke, the light that the photoemission cell (12) in the flue gas inspection device (1) issues expands by smoke particle
Enter the photoelectric receiving tube (13) after dissipating, the photoelectric receiving tube generates response voltage and feeds back response voltage signal
To controller, oil smoke is discharged according to the compressor flow in the big minor adjustment range hood of response voltage in the controller.
10. a kind of flue gas inspection method according to claim 9, which is characterized in that this method further include:
Range hood is opened, whether has oil in the real-time acquisition testing oil smoke flow channel (23) of the flue gas inspection device (1)
Cigarette；
If the light that the photoemission cell (12) in the flue gas inspection device (1) issues does not enter opto-electronic receiver without oil smoke
It manages (13), i.e. photoelectric receiving tube (13) does not generate response voltage, and the controller does not adjust the compressor flow in range hood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538060.1A CN110261314A (en) | 2019-06-20 | 2019-06-20 | Smoke detection device for range hood, range hood and smoke detection method of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538060.1A CN110261314A (en) | 2019-06-20 | 2019-06-20 | Smoke detection device for range hood, range hood and smoke detection method of range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110261314A true CN110261314A (en) | 2019-09-20 |
Family
ID=67919939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910538060.1A Pending CN110261314A (en) | 2019-06-20 | 2019-06-20 | Smoke detection device for range hood, range hood and smoke detection method of range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110261314A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503598A (en) * | 2020-11-30 | 2021-03-16 | 华帝股份有限公司 | Smoke suction effect detection device and method for range hood |
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| CN201454388U (en) * | 2009-03-27 | 2010-05-12 | 上海乾瀚环保科技有限公司 | Plasma industrial waste gas purifying equipment |
| CN204537376U (en) * | 2015-04-20 | 2015-08-05 | 真诺测量仪表(上海)有限公司 | For the sensor fixing structure of smoke alarm obstacle detection system |
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