CN207440961U - A kind of stand alone type cigarette sense fire detecting and alarm device - Google Patents
A kind of stand alone type cigarette sense fire detecting and alarm device Download PDFInfo
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- CN207440961U CN207440961U CN201721697930.2U CN201721697930U CN207440961U CN 207440961 U CN207440961 U CN 207440961U CN 201721697930 U CN201721697930 U CN 201721697930U CN 207440961 U CN207440961 U CN 207440961U
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Abstract
The utility model discloses a kind of free-standing cigarette sense fire detecting and alarm devices, it includes bottom case and bowl-shape face-piece, wiring board is equipped in the face-piece, the wiring board is equipped with smoke inductor, the top of the face-piece is equipped with head cover, smog window is formed between the head cover and the face-piece, stent is fixed on the bottom case, the stent is equipped with electroacoustic transducer, the electroacoustic transducer is electrically connected at wiring board, leading note barrel is formed at the top of the stent, the electroacoustic transducer goes out sound side towards the leading note barrel, the top open part of the leading note barrel is formed with inclined first trimming, first trimming and the inner wall of the face-piece fit closely, the face-piece is equipped with out sound window, it is described go out sound window align with the open top of the leading note barrel.The utility model can will be conducted in sound set that electroacoustic transducer is sent to sound window is gone out, so as to improve alarm volume, improve monitoring, alarming performance.
Description
Technical field
The utility model is related to fire detection equipment more particularly to a kind of free-standing cigarette sense fire detecting and alarm devices.
Background technology
Smog that cigarette sense fire detector generates when being by sensing on fire judges the monitoring device of situation on fire, mesh
Before, the more extensive detector of application is free-standing fire detector, passes through built-in inductor, wiring board, electro-acoustic element
Deng the detection and alarm for completing smog, but in current detector, the electro-acoustic elements such as loudspeaker, buzzer are all disposed on shell
It is interior, it is made a sound by the window opened up on shell, but when electro-acoustic element sounding, sound is first in the inner space of shell
Radiation, window can only spread out of smaller part of sound, this result in the sound of cigarette sense fire detector too small and cannot be by user
It hears, it, then, can not be in small-sized free-standing cigarette sense fire there are the problems such as power consumption is high, electricity shortage according to high-power loudspeaker
It is applied in detecting alarm.
Utility model content
The technical problems to be solved in the utility model is that in view of the deficiencies of the prior art, providing one kind can be by electroacoustic
It is conducted in the sound set that converter is sent to sound window is gone out, so as to the stand alone type for improving alarm volume, improving monitoring, alarming performance
Cigarette sense fire detecting and alarm device.
In order to solve the above technical problems, the utility model adopts the following technical solution.
A kind of stand alone type cigarette sense fire detecting and alarm device, includes bottom case and bowl-shape face-piece, the face-piece is provide with
It is fixed in bottom case and the two, wiring board is equipped in the face-piece, the wiring board is fixed on bottom case, on the wiring board
Equipped with smoke inductor, the top of the face-piece is equipped with head cover, and smog window, institute are formed between the head cover and the face-piece
Smog window is stated to align with the smoke inductor, the bottom notch of the bottom case and be formed with battery compartment, in the battery compartment
Equipped with battery, the battery is used to provide power supply for wiring board, and stent is fixed on the bottom case, and the stent is equipped with electroacoustic
Converter, the electroacoustic transducer are electrically connected at wiring board, and leading note barrel, the electroacoustic conversion are formed at the top of the stent
Device goes out sound side towards the leading note barrel, and the top open part of the leading note barrel is formed with inclined first trimming, and described first
Trimming and the inner wall of the face-piece fit closely, and the face-piece is equipped with out sound window, it is described go out sound window and the leading note barrel
Open top alignment.
Preferably, the top open part of the leading note barrel is formed with inclined second trimming, second trimming with it is described
Default angle is formed between first trimming, the overlapping edges of the wiring board are in second trimming.
Preferably, the inner wall of the leading note barrel is formed with baffle, and the baffle is located at the lower section of second trimming, and institute
Baffle is stated to tilt obliquely upward.
Preferably, the edge of the stent has extended downwardly multiple columns, and the lower end of the column is fixedly connected on bottom
Shell.
Preferably, the electroacoustic transducer is buzzer.
Preferably, sound hole is offered on the stent, the sound hole is communicated in the leading note barrel, the bottom shape of the stent
Into there is annular flange, the annular flange is surrounded on the sound hole, and the electroacoustic transducer is fixed in annular flange, and described
Electroacoustic transducer is covered in the sound hole.
In free-standing cigarette sense fire detecting and alarm device disclosed in the utility model, when smoke inductor senses smog
Electric signal is exported to wiring board, the wiring board control electroacoustic transducer sends alarm sound, which is conducted by leading note barrel
To going out sound window, then from going out sound window to external radiation, since the top open part of leading note barrel is formed with the first trimming, and described
The inner wall of one trimming and face-piece fits closely so that leading note barrel forms a sound chamber with face-piece, and goes out sound window as sound chamber
Outlet, the alarm sound that can send electroacoustic transducer are concentrated to external radiation, avoid sound and cause to decline in shell internal radiation
Subtract, and then improve alarm volume, improve monitoring, alarming performance.
Description of the drawings
Fig. 1 is the stereogram of the utility model cigarette sense fire detecting and alarm device.
Fig. 2 is the cut-away view of the utility model cigarette sense fire detecting and alarm device.
Fig. 3 is the enlarged drawing of part A in Fig. 2.
Fig. 4 is the top view of the utility model cigarette sense fire detecting and alarm device.
Fig. 5 is along the sectional view of line B-B in Fig. 4.
Fig. 6 is the exploded view one of the utility model cigarette sense fire detecting and alarm device.
Fig. 7 is the exploded view two of the utility model cigarette sense fire detecting and alarm device.
Fig. 8 is the structure chart of bottom case,
Fig. 9 is the structure chart one of stent and electroacoustic transducer.
Figure 10 is the structure chart two of stent and electroacoustic transducer.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and examples.
Embodiment one
The present embodiment proposes a kind of free-standing cigarette sense fire detecting and alarm device, with reference to shown in Fig. 1, Fig. 2 and Fig. 6,
Include bottom case 1 and bowl-shape face-piece 2, the face-piece 2 covers at bottom case 1 and the two is fixed, and line is equipped in the face-piece 2
Road plate 3, the wiring board 3 are fixed on bottom case 1, and the wiring board 3 is equipped with smoke inductor 4, and the top of the face-piece 2 is set
There is head cover 20, smog window 21, the smog window 21 and the smog sense are formed between the head cover 20 and the face-piece 2
Device 4 is answered to align, the bottom notch of the bottom case 1 and be formed with battery compartment 5, battery 50, the battery are equipped in the battery compartment 5
50 are used to provide power supply for wiring board 3, and stent 6 is fixed on the bottom case 1, and the stent 6 is equipped with electroacoustic transducer 60, institute
It states electroacoustic transducer 60 and is electrically connected at wiring board 3, the top of the stent 6 is formed with leading note barrel 61, the electroacoustic transducer
60 go out sound side towards the leading note barrel 61, and the top open part of the leading note barrel 61 is formed with inclined first trimming 62, institute
State the first trimming 62 and the inner wall of the face-piece 2 fit closely, the face-piece 2 is equipped with out sound window 22, it is described go out sound window
22 align with the open top of the leading note barrel 61.
In above-mentioned stand alone type cigarette sense fire detecting and alarm device, electric signal is exported when smoke inductor 4 senses smog
To wiring board 3, the wiring board 3 controls electroacoustic transducer 60 to send alarm sound, which is conducted by leading note barrel 61 to going out
Sound window 22, then from going out sound window 22 to external radiation, since the top open part of leading note barrel 61 is formed with the first trimming 62, and institute
It states the first trimming 62 and the inner wall of face-piece 2 fits closely so that leading note barrel 61 forms a sound chamber with face-piece 2, and goes out sound window
The alarm sound that electroacoustic transducer 60 is sent can be concentrated to external radiation, avoid sound in housing by 22 outlet as sound chamber
It is interior radiation and cause to decay, and then improve alarm volume, improve monitoring, alarming performance.
In the present embodiment, the top open part of the leading note barrel 61 is formed with inclined second trimming 63, and described second cuts
Default angle is formed between side 63 and first trimming 62, the overlapping edges of the wiring board 3 are in second trimming 63.It should
One effect of the second trimming 63 is to provide clearance position for wiring board 3, another effect is can to play support to wiring board 3 to make
With.
As a kind of preferred embodiment, the inner wall of the leading note barrel 61 is formed with baffle 64, and the baffle 64 is located at described the
The lower section of two trimmings 63, and the baffle 64 tilts obliquely upward.Under the action of baffle 64, guiding can be played to sound and is made
With so that sound can be concentrated more.
For the ease of stent 6 is fixed, Fig. 6, Fig. 9 and Figure 10 refer to, the edge of the stent 6 has extended downwardly more
A column 65, the lower end of the column 65 are fixedly connected on bottom case 1.Further, the electroacoustic transducer 60 is buzzer.
In the present embodiment, sound hole 66 is offered on the stent 6, the sound hole 66 is communicated in the leading note barrel 61, described
The bottom of stent 6 is formed with annular flange 67, and the annular flange 67 is surrounded on the sound hole 66, and the electroacoustic transducer 60 is solid
Due in annular flange 67, and the electroacoustic transducer 60 is covered in the sound hole 66.
Embodiment two
In practical application, the smoke inductor of fire detecting and alarm device includes labyrinth, and labyrinth is by barrier board, web plate and fan
Palace lid composition so that form a cavity, smog enters labyrinth by the window on shell in the labyrinth in so that infrared transmitting tube with connect
Closed tube can sense the smog in labyrinth and generate electric signal.In this labyrinth, it is desirable that smog can only be from the gap of barrier board
Into labyrinth, so labyrinth lid is usually fixed or is connected to barrier board top, it is not only difficult to manufacture, and in length
Under phase service condition, can not learn dust, moisture content whether are accumulated in labyrinth, and these dusts, water droplet will seriously affect it is infrared
The accuracy of detection of pipe, thus examination and maintenance are not easy to, the market demand can not be met.To solve these technical problems, this implementation
Example propose it is a kind of without labyrinth lid, simplify product structure, convenient for check and safeguard, be readily produced manufacture based on photo-electric
The fire detecting and alarm device of smoke inductor.
Fig. 1, Fig. 2, Fig. 4, Fig. 5, Fig. 6 and Fig. 7 are refer to, which includes bottom case 1 and bowl-shape
Face-piece 2, the face-piece 2 covers at bottom case 1 and the two is fixed, and wiring board 3 is equipped in the face-piece 2, and the wiring board 3 is solid
Due on bottom case 1, the wiring board 3 is equipped with smoke inductor 4, and the smoke inductor 4 includes support base 40 and tubular
Web plate 42, the top of the support base 40 is formed with multiple barrier boards 41, and multiple barrier boards 41 are equal along the edge of support base 40
Even distribution, the web plate 42 are sheathed on multiple barrier boards 41, and infrared-emitting diode 43 and red is embedded on the support base 40
Outer reception diode 44, the infrared-emitting diode 43 and infrared receiving diode 44 are electrically connected in wiring board 3, institute
The top for stating face-piece 2 is equipped with head cover 20, and smog window 21, the smog window are formed between the head cover 20 and the face-piece 2
Mouth 21 is towards the web plate 42, and the top of the barrier board 41 and the inner wall of head cover 20 fit closely, the head cover 20, barrier board
41 and support base 40 surround to form labyrinth chamber, the infrared-emitting diode 43 and infrared receiving diode 44 are towards the fan
Uterine cavity.
In above-mentioned fire detecting and alarm device, since the top of barrier board 41 can be fitted closely with the inner wall of head cover 20,
So when face-piece 2 is installed on bottom case 1, head cover 20, barrier board 41 and support base 40 can surround and form labyrinth chamber, infrared
The smog in the labyrinth chamber can be sensed under the mating reaction of emitting diode 43 and infrared receiving diode 44, and then is realized
Smoke Detection.In said structure, without configuring labyrinth lid for smoke inductor, so simplifying product structure, reducing production
Manufacture difficulty saves product cost, meanwhile, user, which need to only remove face-piece 2, can check the inner case in labyrinth, and then conveniently
It checks, cleaning and maintenance work.
In the present embodiment, in order to improve cigarette sense sensitivity, the inner wall of the head cover 20 is coated with pitch-dark layer.
Further, in order to realize the matching of binding face, the top of the barrier board 41 is formed with curved end 410, institute
The inside for stating head cover 20 is formed with arc inner wall 200, and the curved end 410 is fitted closely with the arc inner wall 200.
As a kind of preferred embodiment, the wiring board 3 is equipped with LED light 30, and light pipe is equipped in the face-piece 2
31, one end of the light pipe 31 is sheathed on the LED light 30, and the other end of the light pipe 31 is arranged in the face-piece
2。
Embodiment three
In practical application, the inside of fire detecting and alarm device is both provided with wiring board, is used to install smog on wiring board
The devices such as detector, the wiring board need to be fixedly mounted in housing, and existing installation method is to be consolidated wiring board by screw
It is scheduled on column, but is influenced by factors such as processing technology, machining accuracies, through hole and the column for generally occurring within wiring board be not right
Its situation, although can force to fix wiring board at this time, wiring board must bear certain stress, and detection
Warning device needs to be chronically at monitoring state, under the conditions of long-time service, wiring board by stress influenced will to be present with deformation,
The situations such as PCB trace tear, cause the service life of fire detecting and alarm device to reduce, stability, reliability are poor.In addition,
When needing replacing wiring board, because of screw repeated disassembled and assembled so that screw cannot be locked reliably with column, should be whole by casing part
It changes, causes the wasting of resources.To solve these technical problems, the present embodiment propose one kind be avoided that wiring board meet with stresses,
The service life of product can be improved, the Stability and dependability of product is improved, is easy to dismount, avoids impaired fire due to dismounting
Detection alarm device.
It refer to Fig. 1, Fig. 2, Fig. 3 and Fig. 6, the fire detecting and alarm device in the present embodiment includes bottom case 1 and bowl-shape
Face-piece 2, the face-piece 2 covers at bottom case 1 and the two is fixed, and wiring board 3, the wiring board 3 are equipped in the face-piece 2
It is fixed on bottom case 1, the wiring board 3 is equipped with smoke inductor 4, and the top of the face-piece 2 is equipped with head cover 20, the head cover
Smog window 21 is formed between 20 and the face-piece 2, the smog window 21 aligns with the smoke inductor 4, the bottom
Multiple columns 10 and multiple card columns 11 are formed on shell 1, the top of the column 10 is connected to the bottom of wiring board 3, multiple cards
Column 11 is divided into the surrounding of wiring board 3, and the top of the card column 11 is formed with hook portion 110, and the hook portion 110 is in inverted " u "
Shape, and the hook portion 110 is located at the top of wiring board 3, the end of the hook portion 110 is formed with the bayonet of inverted "L" shape
111, the edge card of the wiring board 3 is arranged in the bayonet 111, by multiple columns 10 and multiple card columns 11 by the line
Road plate 3 is fixed on bottom case 1.
In above-mentioned fire detecting and alarm device, played a supporting role using column 10 to the bottom of wiring board 3, multiple card columns
11 are divided into the surrounding of wiring board 3, and the card column 11 is equipped with hook portion 110, and the end of hook portion 110 is sharp towards wiring board 3
The edge of wiring board 3 can be connected in the bayonet 111 of the inverted "L" shape of 110 end of hook portion, in bayonet 111 and column 10
Longitudinally wiring board 3 can be clamped under mating reaction, can laterally be pressed from both sides wiring board 3 under the mating reaction of multiple bayonets 111
Tightly, and then the fixation to wiring board 3 is realized.The device can fix wiring board 3 without screw, so as to avoid wiring board
It meets with stresses, substantially increase the service life of product and improves the Stability and dependability of product, particularly tieing up
During repairing, dismounting, need to only exert a force to card column 11 can remove wiring board 3 so that wiring board 3 is easier to dismount, and protects
Housing parts are against damages.
In order to improve the stress intensity of card column 11, the side of the card column 11 is equipped with the first reinforcing rib 112, the bottom case 1,
11 and first reinforcing rib 112 of card column is integrally formed.
Further, first reinforcing rib 112 is located at card column 11 backwards to the one side of wiring board 3.
The present embodiment has further included pedestal 7, and the bottom case 1 is fixed with the pedestal 7.
Example IV
In practical application, cigarette sense fire detecting and alarm device is stand alone type installation mostly, each to fill to realize dotted laying
It puts using battery powered, specific implementation method is that battery compartment is set on bottom case, and battery is installed in battery compartment, recycles storehouse
Battery compartment is covered on, completes the assembling of battery.In the construction process, it is necessary to, could be by fire after battery is installed on battery compartment
Calamity detection alarm device is installed on predeterminated position, and during practical operation, often it is present with the situation of neglected loading battery, fire is caused to be visited
Measuring alarming device can not play a role due to short of electricity, and then bring security risk, can not meet application demand.To solve this skill
Art problem, the present embodiment proposes one kind and can prevent neglected loading battery, can improve safety and reliability, and meets application demand
Cigarette sense fire detecting and alarm device.
It refer to Fig. 1, Fig. 2, Fig. 6, Fig. 7 and Fig. 8, the cigarette sense fire detecting and alarm device in the present embodiment includes bottom case
1 and bowl-shape face-piece 2, the face-piece 2 covers at bottom case 1 and the two is fixed, and wiring board 3 is equipped in the face-piece 2, described
Wiring board 3 is fixed on bottom case 1, and the wiring board 3 is equipped with smoke inductor 4, and the top of the face-piece 2 is equipped with head cover 20,
Smog window 21 is formed between the head cover 20 and the face-piece 2, the smog window 21 and the smoke inductor 4 are right
Together, the bottom notch of the bottom case 1 and be formed with battery compartment 5, the opening of the battery compartment 5 is covered with warehouse lid 8, the battery
Battery 50 is equipped in storehouse 5, the battery 50 is used to provide power supply for wiring board 3, and elastic piece 51, institute are equipped in the battery compartment 5
The first end for stating elastic piece 51 is connected to the inner wall of battery compartment 5, and the second end elasticity of the elastic piece 51 is connected to battery 50, institute
It states and grooved hole 80 is opened up in warehouse lid 8, the second end of the elastic piece 51 is extended to through the slot 80 outside battery compartment 5,
When not installing battery 50 in the battery compartment 5, the elastic piece 51 elastic stretch into battery compartment 5, the elastic piece 51
Second end is protruding by the opening of battery compartment 5.
In above-mentioned cigarette sense fire detecting and alarm device, elastic piece 51 is provided in battery compartment 5, in elastic piece 51 itself
Under elastic reaction, the elastic potential energy stretched into battery compartment 5 is made it have, so when installation battery 50 in battery compartment 5, battery
50 can squeeze elastic piece 51, and the madial wall of elastic piece 51 to battery compartment 5 is made to draw close, while the second end of elastic piece 51 passes through storehouse
Slot 80 on lid 8 so that warehouse lid 8 can be covered on the opening of battery compartment 5；When not installing battery 50 in battery compartment 5,
Under the action of elastic potential energy, the elastic stretch into battery compartment 5 of elastic piece 51, since the second end of elastic piece 51 is longer, so its
It can extend to outside the opening of battery compartment 5, warehouse lid 8 cannot be covered on battery compartment 5 at this time.Based on said structure so that cigarette sense
Fire detecting and alarm device only can just cover warehouse lid 8 after battery 50 is installed, and effectively prevent happening for neglected loading battery,
The safety and reliability of cigarette sense fire detecting and alarm device is substantially increased, and then meets the market demand.
For the ease of processing and manufacturing, the elastic piece 51 is integrally formed with the bottom case 1.
On the concrete structure of elastic piece 51, the first end of the elastic piece 51 is obliquely installed, and the of the elastic piece 51
Two ends are vertically arranged, and the angle between the first end and second end of the elastic piece 51 is in obtuse angle.Wherein, inclined first end
For generating elastic force, vertical second end is used to be adjacent to battery 50 so that the elastic force between elastic piece 51 and battery 50 is maintained at
Laterally, in order to place battery 50.
Further, the inner wall of the battery compartment 5 offers to house the avoiding hollow groove 52 of the elastic piece 51.
In the present embodiment, in order to improve the mechanical strength of elastic piece 51, first end and the avoiding hollow groove 52 of the elastic piece 51
Inner wall between be formed with the second reinforcing rib 53.
The above is the utility model preferred embodiment, is not intended to limit the utility model, all in this practicality
Modification, equivalent substitution or improvement made in new technical scope etc., should be included in the model that the utility model is protected
In enclosing.
Claims (6)
1. a kind of stand alone type cigarette sense fire detecting and alarm device, which is characterized in that include bottom case and bowl-shape face-piece, the face
Clamshell is arranged on bottom case and the two is fixed, and wiring board is equipped in the face-piece, and the wiring board is fixed on bottom case, the line
Road plate is equipped with smoke inductor, and the top of the face-piece is equipped with head cover, smog is formed between the head cover and the face-piece
Window, the smog window align with the smoke inductor, the bottom notch of the bottom case and be formed with battery compartment, the electricity
Battery is equipped in the storehouse of pond, the battery is used to provide power supply for wiring board, stent is fixed on the bottom case, is set on the stent
There is electroacoustic transducer, the electroacoustic transducer is electrically connected at wiring board, and leading note barrel, the electricity are formed at the top of the stent
Acoustical convertor goes out sound side towards the leading note barrel, and the top open part of the leading note barrel is formed with inclined first trimming, institute
State the first trimming and the inner wall of the face-piece fit closely, the face-piece is equipped with out sound window, it is described go out sound window with it is described
The open top alignment of leading note barrel.
2. stand alone type cigarette sense fire detecting and alarm device as described in claim 1, which is characterized in that the top of the leading note barrel
Opening is formed with inclined second trimming, and default angle, the line are formed between second trimming and first trimming
The overlapping edges of road plate are in second trimming.
3. stand alone type cigarette sense fire detecting and alarm device as claimed in claim 2, which is characterized in that the inner wall of the leading note barrel
Baffle is formed with, the baffle is located at the lower section of second trimming, and the baffle tilts obliquely upward.
4. stand alone type cigarette sense fire detecting and alarm device as described in claim 1, which is characterized in that the edge of the stent
Multiple columns are extended downwardly, the lower end of the column is fixedly connected on bottom case.
5. stand alone type cigarette sense fire detecting and alarm device as described in claim 1, which is characterized in that the electroacoustic transducer is
Buzzer.
6. stand alone type cigarette sense fire detecting and alarm device as claimed in claim 5, which is characterized in that offered on the stent
Sound hole, the sound hole are communicated in the leading note barrel, and the bottom of the stent is formed with annular flange, and the annular flange is surrounded on
The sound hole, the electroacoustic transducer are fixed in annular flange, and the electroacoustic transducer is covered in the sound hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721697930.2U CN207440961U (en) | 2017-12-07 | 2017-12-07 | A kind of stand alone type cigarette sense fire detecting and alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721697930.2U CN207440961U (en) | 2017-12-07 | 2017-12-07 | A kind of stand alone type cigarette sense fire detecting and alarm device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207440961U true CN207440961U (en) | 2018-06-01 |
Family
ID=62286130
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721697930.2U Active CN207440961U (en) | 2017-12-07 | 2017-12-07 | A kind of stand alone type cigarette sense fire detecting and alarm device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207440961U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111127801A (en) * | 2018-10-31 | 2020-05-08 | 江门市奇斌模具制品有限公司 | Buzzing fire alarm |
| CN112614299A (en) * | 2021-01-06 | 2021-04-06 | 桂林电子科技大学 | Stand alone type photoelectric smoke sensing fire detector based on NB IoT |
-
2017
- 2017-12-07 CN CN201721697930.2U patent/CN207440961U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111127801A (en) * | 2018-10-31 | 2020-05-08 | 江门市奇斌模具制品有限公司 | Buzzing fire alarm |
| CN112614299A (en) * | 2021-01-06 | 2021-04-06 | 桂林电子科技大学 | Stand alone type photoelectric smoke sensing fire detector based on NB IoT |
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