CN106205008B - A kind of fire alarm method, alarm system and household electrical appliance - Google Patents
A kind of fire alarm method, alarm system and household electrical appliance Download PDFInfo
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- CN106205008B CN106205008B CN201610604690.0A CN201610604690A CN106205008B CN 106205008 B CN106205008 B CN 106205008B CN 201610604690 A CN201610604690 A CN 201610604690A CN 106205008 B CN106205008 B CN 106205008B
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- dirty stifled
- filtrating screen
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
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- Emergency Management (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire Alarms (AREA)
Abstract
The present invention relates to home wiring control field, more particularly to a kind of fire alarm method, alarm system and household electrical appliance.Method includes the following steps：Obtain the dirty stifled rate of change of dirt filtrating screen；When the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm installation and/or extinguishing device.The present invention need not add fire-alarm; situations such as dirty stifled degree change rate by monitoring dirt filtrating screen in the household electrical appliance such as air-conditioning, air filter would know that smokescope in air; to carry out fire alarm in time or open extinguishing device; fire alarm process is simpler, quickly and accurately; great protective effect not only is played to the personal and property safety of user in the case where not increasing user cost, but also enriches the function of these household electrical appliance and improves its commercial value.
Description
Technical field
The present invention relates to home wiring control field, more particularly to a kind of fire alarm method, alarm system and household electrical appliance.
Background technology
At present in China's fire-fighting system, the special fire-alarm of generally use is alarmed, and principle is when will catch fire
The environmental parameters such as cigarette, light, temperature variation detected by corresponding detector after be transmitted to central processing host, pass through centre
The quick analysis for managing host, judge to monitor position whether fight case of fire alarmed.This automatic fire alarm side
Method is generally used since it is desired that the special fire alarm installation of installation in public situations such as hotel, office building, libraries.Together
When existing fire-alarm need special mounted to a wall, not only increase installation procedure, and influence indoor beauty.For
Some are fitted without the place of fire-alarm, such as in user family, fire occur when nighttime users sound sleep, general user is very
Difficulty is discovered, and when discovering, fire is serious already, it is difficult to escape.If it is possible to which fire alarm need not be increased by providing one kind
Device, the method for being monitored and alarming to fire condition just with user's existing equipment can then not increase user cost
In the case of, great protective effect is played to the personal and property safety of user.
Invention content
The present invention provides a kind of fire alarm method, alarm system and household electrical appliance, solve the above technical problem.
The technical solution that the present invention solves above-mentioned technical problem is as follows：
One side according to the present invention provides a kind of fire alarm method, includes the following steps：
Step 1, the dirty stifled rate of change of dirt filtrating screen is obtained；
Step 2, when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm
Device and/or extinguishing device.
Other side according to the present invention provides a kind of fire alarm system, including dirty stifled rate of change obtains mould
Block and control module,
The dirty stifled rate of change acquisition module is used to obtain the dirty stifled rate of change of dirt filtrating screen；
The control module is used for when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, is opened
Dynamic fire alarm installation and/or extinguishing device.
In order to solve the technical problem of the present invention, the present invention also provides a kind of household electrical appliance, including the fire alarm
System.
The beneficial effects of the invention are as follows：The fire alarm method and system of the present invention need not add fire-alarm, lead to
The dirty stifled degree change rate for crossing dirt filtrating screen in the household electrical appliance such as monitoring air-conditioning, air filter would know that smokescope in air
Situations such as, to carry out fire alarm in time or open extinguishing device, fire alarm process is simpler, quickly and accurately,
Great protective effect not only is played to the personal and property safety of user in the case where not increasing user cost, but also abundant
The function of these household electrical appliance simultaneously improves its commercial value.
Description of the drawings
Fig. 1 is a kind of flow diagram of 1 fire alarm method of embodiment；
Fig. 2 is a kind of structural schematic diagram of 2 fire alarm system of embodiment；
Fig. 3 is the structural schematic diagram of dirt filtrating screen filth blockage detection device in embodiment 2；
Fig. 4 is the structural schematic diagram of dirt filtrating screen filth blockage detection device in embodiment 3；
Fig. 5 is a kind of structural schematic diagram of 4 household electrical appliance of embodiment；
In above-mentioned attached drawing, each label is specially：
1, microcontroller, 2, first switch control circuit, 3, infrared light-emitting diode, 4, photodiode, 5, power supply module,
6, connector, 7, dirt filtrating screen, 8, detection module, 9, transmitting and receiving module, 10, second switch control circuit.
Specific implementation mode
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the present invention.
As shown in Figure 1, for a kind of flow diagram of 1 fire alarm method of embodiment, include the following steps：
Step 1, the dirty stifled rate of change of dirt filtrating screen is obtained using photoelectric detecting method；
Step 2, when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm
Device and/or extinguishing device.
When fire occurs, smog can be spread rapidly, and smog itself is large particulate matter, when using optical detection principle
When detection dirt filtrating screen is dirty stifled, smog is full of between light emitting devices and light-sensitive element, reflection, scattering, absorption of the smog to light
Effect is very big, is faint to make the optrode that light-sensitive element receives, and it is that dirt filtrating screen is serious dirty stifled to lead to testing result, this dirty
Stifled rapid variation can be reacted on the dirty stifled rate of change of dirt filtrating screen, so as to detect dirt filtrating screen using photoelectric detecting method
Dirty stifled degree, and then obtain dirty stifled rate of change, emergency alarm carried out to fire.In the present embodiment, using Photoelectric Detection side
Method has extraordinary fire effect, in other embodiments, can also adopt the dirty stifled change for obtaining dirt filtrating screen with other methods
Change rate, for example, by detect air force, operation of air conditioner duration, fan operation power, the parameters such as dirt filtrating screen both sides pressure difference come
The dirty stifled degree of dirt filtrating screen is obtained, specially：Operation of air conditioner duration is longer, and the dirty stifled degree of dirt filtrating screen is higher；Because of dirt filtrating screen
It is dirty it is stifled can influence air circulation, therefore the dirty stifled degree of dirt filtrating screen is higher, and fan operation power is bigger；And the dirty stifled degree of dirt filtrating screen
Higher, air quantity is smaller, dirt filtrating screen both sides pressure difference also smaller.
The step 1 of the present embodiment 1 is specially：The first dirty stifled degree of dirt filtrating screen is obtained using photoelectric detecting method, and is passed through
After prefixed time interval △ t, the second dirty stifled degree of dirt filtrating screen is obtained again using photoelectric detecting method；Between acquisition preset time
The dirty stifled degree changing value of dirt filtrating screen before and after △ t, and dirty stifled rate of change v is generated, the dirty stifled rate of change is dirt filtrating screen
Dirty stifled degree changing value and the prefixed time interval △ t ratio.In the present embodiment, prefixed time interval △ t should not mistake
Long, the too long effect for not having detection fire behavior in time and notifying user is advisable with 2-5min.
In other examples, current dirty stifled rate of change can also be obtained by the following method, specially：Using light
Electric detection method obtains the first dirty stifled degree of dirt filtrating screen, and by the dirty stifled degree of predeterminated frequency continuous collecting dirt filtrating screen；Record
The time undergone when the difference of collected dirty stifled degree and the described first dirty stifled degree reaches preset difference value threshold value, and it is raw
At dirty stifled rate of change, the dirty stifled rate of change is the ratio of the difference and elapsed time.This method passes through fixation
One dirty stifled degree changing value △ d, such as 10 ‰, then press the dirty stifled degree of predeterminated frequency continuous collecting dirt filtrating screen, such as half
Minute obtains the dirty stifled degree of a dirt filtrating screen, while adding up to the time, when the changing value of dirty stifled degree reaches △ d,
Time △ t needed for record, and then calculate dirty stifled rate of change v.This method can be when smokescope be very big in air, soon
Speed obtains dirty stifled rate of change, it is not necessary to undergo first method fixed time interval.Thus can when fire occurs, more and
When to user provide alarm.
In embodiment 1, the dirty stifled degree that dirt filtrating screen is obtained using photoelectric detecting method is included the following steps：
It controls light emitting devices and irradiates the dust filtration net；
It controls light-sensitive element and receives the transmitted light through the dust filtration net or receive and pass through the irreflexive reflection of dirt filtrating screen
Light；
The intensity of illumination of transmitted light or reflected light that the light-sensitive element receive is converted for indicating that dirt filtrating screen is dirty to
The numerical value of stifled degree, such as the voltage value with the concatenated resistance of the light-sensitive element.
In the present embodiment, the fax of collected resistance both ends can be defeated by microcontroller, then utilized built in microcontroller
Analog-digital converter, you can the analog voltage signal at resistance both ends is converted into digital information values, this value is used in combination to indicate dirt filtrating screen
Dirty stifled degree.In the present embodiment 1, resistance both end voltage is bigger, and microcontroller is converted into that digital information values are bigger, illustrates to be appeared
Intensity of illumination is bigger, and the dirty stifled situation of dirt filtrating screen is slighter, and this method is not only simple in structure, of low cost and result is accurate
Really, it can need to be mounted directly use, and installation process in the household electrical appliance for installing dirt filtrating screen in air-conditioning, air filter etc.
It is very simple.
In the present embodiment, the step 2 is specially：Set the dirty stifled variation speed of the corresponding dirt filtrating screen of normal indoor air condition
Rate maximum value；The dirty stifled rate of change maximum value of the dust filtration net is multiplied by using predetermined coefficient, obtains preset dirty stifled rate of change
Threshold value；When the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm installation and/or
Extinguishing device.In the present embodiment, when dirty stifled rate of change exceeds dirty stifled rate of change threshold value, buzzer is driven to continue not at once
It is disconnected to send out sharp alarm, it is fled from time to wake up user.In the present embodiment, the value range of the predetermined coefficient is 2
Between~3, such as 2.5.
As shown in Fig. 2, for a kind of structural schematic diagram of 2 fire alarm system of embodiment, including dirty stifled rate of change obtains
Module and control module, the dirty stifled rate of change acquisition module are used to obtain the dirty stifled change of dirt filtrating screen using photoelectric detecting method
Change rate；The control module is used for when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, is opened
Dynamic fire alarm installation and/or extinguishing device.
In the present embodiment, the dirty stifled rate of change acquisition module includes：First detection unit, for using Photoelectric Detection
Method obtains the dirty stifled degree of the dirt filtrating screen before and after prefixed time interval；First computing unit, for according to prefixed time interval
The dirty stifled degree of front and back dirt filtrating screen obtains the dirty stifled degree changing value of dirt filtrating screen, and generates dirty stifled rate of change, described dirty stifled
Rate of change is the ratio of dirty stifled the degree changing value and the prefixed time interval of dirt filtrating screen.In other embodiments, described
Dirty stifled rate of change acquisition module includes：Second detection unit, first for using photoelectric detecting method acquisition dirt filtrating screen are dirty
Stifled degree, and by the dirty stifled degree of predeterminated frequency continuous collecting dirt filtrating screen；Second computing unit, for recording when collected dirty
The difference of stifled degree and the described first dirty stifled degree reaches the time undergone when preset difference value threshold value, and generates dirty stifled variation speed
Rate.
In the present embodiment, the control module includes：Storage unit, for storing the normal indoor air shape obtained in advance
The dirty stifled rate of change maximum value of the corresponding dirt filtrating screen of state；Threshold value acquiring unit, for being multiplied by the dust filtration net using predetermined coefficient
Dirty stifled rate of change maximum value obtains preset dirty stifled rate of change threshold value；Control unit, for the dirty stifled variation when dirt filtrating screen
When rate reaches preset dirty stifled rate of change threshold value, start fire alarm installation and/or extinguishing device.
The first detection unit and second detection unit include dirt filtrating screen filth blockage detection device, as shown in figure 3, for this
The structural schematic diagram of dirt filtrating screen filth blockage detection device described in embodiment.The dust filtration net filth blockage detection device includes by patching
The transmitting and receiving module 9 and detection module 8 that part 6 connects, the detection module 8 include the light for emitting light to dirt filtrating screen 7
Emitter 3 and for receiving the transmitted light for penetrating dirt filtrating screen 7 or light-sensitive element Jing Guo the irreflexive reflected light of dirt filtrating screen
4, the transmitting and receiving module 9 is luminous and saturating for receiving the light-sensitive element 4 for controlling the light emitting devices 3
The intensity of illumination for penetrating light or reflected light is converted into numerical value for indicating the dirty stifled degree of dirt filtrating screen 7.In the present embodiment, the light
Emitter 3 is infrared light-emitting diode；Light-sensitive element 4 is photodiode, and in other embodiments, light-sensitive element 4 may be used also
To be phototriode.In the present embodiment, the transmitting and receiving module 9 includes microcontroller 1, first switch control circuit 2 and uses
It is opened in the first I/O port connection first of the conversion circuit that the photoelectric current of photodiode is converted to voltage, the microcontroller 1
Control circuit 2 is closed, first switch control circuit 2 connects the infrared light-emitting diode by connector 6, and the conversion circuit connects
Connect the simulation input port of microcontroller 1.The conversion circuit includes and the concatenated resistance R4 of the light-sensitive element, resistance R4 and institute
It states the series connection end of light-sensitive element while connecting the simulation input port of the microcontroller 1, resistance R4 other ends ground connection.
In the present embodiment, the base stage of the triode Q1 in the first switch control circuit is connected to microcontroller through resistance R1
The first I/O port, collector is connected to the light emitting devices through resistance R3, transmitting collection ground connection.The base stage of the triode Q1
It is grounded after also series connection pull down resistor R2.The present embodiment uses transistor switching circuit, luminous needing the when detected to open, and is being not required to
It is closed when detecting, not only control circuit is simple, but also can utmostly save energy consumption.Meanwhile in the present embodiment, triode
Collector be connected to infrared light-emitting diode LED by resistance R3, the resistance R3 is LED current limiting safeguard resistors, Ke Yibao
Flow through suitable electric current in card LED, improve dirt filtrating screen filth blockage detection device effect protect simultaneously infrared light-emitting diode not because
Electric current is excessive and damages.
In the present embodiment, the first I/O port output low and high level letter of the microcontroller 1 of the dust filtration net filth blockage detection device
Number, triode Q1 conductings are controlled by low and high level signal and are turned off to be powered to infrared light-emitting diode LED, what LED was sent out
Infrared light dirt filtrating screen, the dust that a portion light is adhered to due to dirt filtrating screen 7 to the reflection of light, scattering, absorb the effects that
And dirt filtrating screen can not be penetrated, to make the light of transmission reduce, and adhesive dust is more, and the light of transmission is fewer.Photodiode 4
It is light-sensitive element, the light being irradiated to thereon is more, bigger by its photoelectric current, it is connected with resistance R4, fixed using ohm
Photoelectric current can be converted into voltage by rule u=ir, by acquiring resistance R4 both end voltages, and be transferred to microcontroller, then utilized
Analog-digital converter built in microcontroller 1, you can analog voltage signal is converted into digital information values, this value is used in combination to indicate dirt filtrating screen
Dirty stifled degree, in the present embodiment, resistance R4 both end voltages are bigger, and it is bigger that microcontroller is converted into digital information values, illustrate thoroughly
The intensity of illumination gone out is bigger, and the dirty stifled situation of dirt filtrating screen is slighter.
As shown in figure 4, the structural schematic diagram for dirt filtrating screen filth blockage detection device in embodiment 3 increases compared with Fig. 3
The second switch control circuit 10 turned on and off for controlling light-sensitive element, second switch control circuit connect the of microcontroller
Two I/O ports control opening and turning off for second switch control circuit by the low and high level signal of corresponding I/O port output.
It is not dirty to dirt filtrating screen stifled when being detected, it can be kept away relative to the device without this ON-OFF control circuit this circuit with reliable turn-off
Power consumption of the photoelectric current for having exempted to generate when non-detection time ambient light irradiates light-sensitive element on transmitting and receiving module.This
In embodiment, the second switch control circuit 10 is transistor switching circuit, including triode Q2, resistance R6 and resistance R7,
The base stage of the triode Q2 is connected to the second I/O port of microcontroller through resistance R6, and collector is connected to the light through resistance R4
The series connection end of quick element and resistance R5, transmitting collection ground connection.The base stage of the triode Q1 is also connected and is grounded after pull down resistor R7.It adopts
It is luminous needing the when detected to open with transistor switching circuit, it is closed when that need not detect, not only control circuit is simple, and
And it can utmostly save energy consumption.
In the corresponding embodiments of Fig. 3 and Fig. 4, the first switch control circuit, second switch control circuit and conversion electricity
Road is integrated in master control borad, and power supply module 5 is additionally provided on master control borad, and the power supply module 5 is separately connected the infraluminescence
Diode and photodiode, for powering for the infrared light-emitting diode and photodiode.The power supply module is five
The voltage regulation filtering power supply of volt.The external device of dirt filtrating screen filth blockage detection device of the present invention only includes light emitting devices and photosensitive member
Part, remaining control circuit part are arranged on master control borad, at the same only need two connecting lines can be realized signal transmitting and
It receives, then adds the connecting line of a connection power supply module that entire detection scheme can be realized, therefore reduce connecting line, occupy empty
Between it is small, it is easy to implement and reduce cost.Light emitting devices and light-sensitive element are small simultaneously, and it is empty to greatly reduce occupancy
Between, to reduce influence of the external device to dirt filtrating screen adhesive dust, it ensure that the accuracy of testing result.While mould of powering
Block is simple, without complicated power supply, mainboard 5v is only needed to power.By the capacitance C1 of a ground connection in parallel on power supply,
The noise jamming that direct current can be removed keeps power supply cleaner, reduces noise.
In the corresponding embodiments of Fig. 3 and Fig. 4, the microcontroller includes analog-digital converter, and the conversion circuit is through microcontroller
Simulation input port be connected to the analog-digital converter, voltage analog signal is converted into digital letter using analog-digital converter
Number, to detect the illumination intensity information obtained, therefore the dirty stifled degree of dirt filtrating screen can be obtained, to facilitate information processing with
Judgement of other functions to this information.In the present embodiment, an electricity is connect at the output pin of the analog-digital converter of the microcontroller
A R5 capacitance C2 being grounded in parallel again is hindered, current limliting and decoupling can be played the role of.In other embodiments, can also pass through
The intensity of illumination by the irreflexive reflected light of dirt filtrating screen is received to detect the dirty stifled degree of dirt filtrating screen, the structure of detection device
It is essentially identical with the dirt filtrating screen filth blockage detection device of embodiment 2, embodiment 3, it is only necessary to the photodiode be changed into and be used for
Receive the photodiode or phototriode Jing Guo the irreflexive reflected light of the dust filtration net.In this embodiment,
Bigger with photodiode or the concatenated resistance both end voltage of phototriode, it is bigger that microcontroller is converted into digital information values,
Illustrate that dust that reflected intensity of illumination is bigger, on dirt filtrating screen etc. is more, the dirty stifled situation of dirt filtrating screen is more serious.
Fig. 5 is a kind of structural schematic diagram of 4 household electrical appliance of embodiment, including the fire alarm system.The present embodiment
In, the household electrical appliance are air-conditioning.In other embodiments, the household electrical appliance can also be that air filter etc. includes filter
The equipment of dirt net.
The present invention need not add fire-alarm, by monitoring dirt filtrating screen in the household electrical appliance such as air-conditioning, air filter
Dirty stifled degree change rate i.e. situations such as would know that smokescope in air, to carry out fire alarm in time or open fire extinguishing
Device, fire alarm process is simpler, quickly and accurately, not only in the case where not increasing user cost to the person of user
And property safety plays great protective effect, and enrich the function of these household electrical appliance and improve its commercial value.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indicating or implies relative importance or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In the description of the present invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (18)
1. a kind of fire alarm method, which is characterized in that include the following steps：
Step 1, the dirty stifled rate of change of dirt filtrating screen is obtained；
Step 2, when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm installation
And/or extinguishing device.
2. fire alarm method according to claim 1, which is characterized in that the step 1 is specially：Obtain preset time
The dirty stifled degree changing value of the front and back dirt filtrating screen in interval, and dirty stifled rate of change is generated, the dirty stifled rate of change is dirt filtrating screen
Dirty stifled degree changing value and the prefixed time interval ratio.
3. fire alarm method according to claim 2, which is characterized in that the prefixed time interval is 2~5 minutes.
4. fire alarm method according to claim 1, which is characterized in that the step 1 is specially：
The first dirty stifled degree of dirt filtrating screen is obtained, and by the dirty stifled degree of predeterminated frequency continuous collecting dirt filtrating screen；
What record was undergone when the difference of collected dirty stifled degree and the described first dirty stifled degree reaches preset difference value threshold value
Time, and generate dirty stifled rate of change.
5. fire alarm method according to any one of claims 1 to 4, which is characterized in that step 2 is specially：
Set the corresponding dirty stifled rate of change maximum value of dirt filtrating screen of normal indoor air condition；
The dirty stifled rate of change maximum value of the dust filtration net is multiplied by using predetermined coefficient, obtains preset dirty stifled rate of change threshold value；
When the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, start fire alarm installation and/or
Extinguishing device.
6. fire alarm method according to claim 5, which is characterized in that the value range of the predetermined coefficient be 2~
3。
7. fire alarm method according to claim 6, which is characterized in that in step 1, obtained using photoelectric detecting method
The dirty stifled degree of dirt filtrating screen, specifically includes following steps：
It controls light emitting devices and irradiates the dust filtration net；
It controls light-sensitive element and receives the transmitted light through the dust filtration net or receive and pass through the irreflexive reflected light of dirt filtrating screen；
The intensity of illumination of transmitted light or reflected light that the light-sensitive element receive is converted for indicating dirt filtrating screen dirty stifled journey to
The numerical value of degree.
8. fire alarm method according to claim 7, which is characterized in that the numerical value is to connect with the light-sensitive element
Resistance voltage value.
9. a kind of fire alarm system, which is characterized in that including dirty stifled rate of change acquisition module and control module,
The dirty stifled rate of change acquisition module is used to obtain the dirty stifled rate of change of dirt filtrating screen；
The control module is used for when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, starts fire
Calamity warning device and/or extinguishing device.
10. fire alarm system according to claim 9, which is characterized in that the dirty stifled rate of change acquisition module packet
First detection unit and the first computing unit are included,
The first detection unit is used to obtain the dirty stifled degree of the dirt filtrating screen before and after prefixed time interval；
First computing unit is used to obtain the dirty of dirt filtrating screen according to the dirty stifled degree of the dirt filtrating screen before and after prefixed time interval
Stifled degree changing value, and dirty stifled rate of change is generated, the dirty stifled rate of change is the dirty stifled degree changing value of dirt filtrating screen and institute
State the ratio of prefixed time interval.
11. fire alarm system according to claim 9, which is characterized in that the dirty stifled rate of change acquisition module packet
It includes：
Second detection unit, the first dirty stifled degree for obtaining dirt filtrating screen, and by the dirty of predeterminated frequency continuous collecting dirt filtrating screen
Stifled degree；
Second computing unit, for recording when the difference of collected dirty stifled degree and the described first dirty stifled degree reaches default poor
The time undergone when value threshold value, and generate dirty stifled rate of change.
12. fire alarm system according to claim 10, which is characterized in that the control module includes：
Storage unit, it is maximum for storing the dirty stifled rate of change of the corresponding dirt filtrating screen of preset normal indoor air condition
Value；
Threshold value acquiring unit obtains preset for being multiplied by the dirty stifled rate of change maximum value of the dust filtration net using predetermined coefficient
Dirty stifled rate of change threshold value；
Control unit, for when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, starting fire
Warning device and/or extinguishing device.
13. fire alarm system according to claim 12, which is characterized in that the first detection unit includes dirt filtrating screen
Filth blockage detection device, the dust filtration net filth blockage detection device include the transmitting and receiving module connected by connector and detection mould
Block, the detection module include light emitting devices for emitting from light to dirt filtrating screen and for receiving the transmission through dirt filtrating screen
Light or light-sensitive element Jing Guo the irreflexive reflected light of dirt filtrating screen, the transmitting and receiving module is for controlling the light emitting dress
The luminous and intensity of illumination of the transmitted light for receiving the light-sensitive element or reflected light is set to be converted into for indicating filter
The numerical value of the dirty stifled degree of dirt net.
14. fire alarm system according to claim 11, which is characterized in that the control module includes：
Storage unit, it is maximum for storing the dirty stifled rate of change of the corresponding dirt filtrating screen of preset normal indoor air condition
Value；
Threshold value acquiring unit obtains preset for being multiplied by the dirty stifled rate of change maximum value of the dust filtration net using predetermined coefficient
Dirty stifled rate of change threshold value；
Control unit, for when the dirty stifled rate of change of dirt filtrating screen reaches preset dirty stifled rate of change threshold value, starting fire
Warning device and/or extinguishing device.
15. fire alarm system according to claim 14, which is characterized in that the second detection unit includes dirt filtrating screen
Filth blockage detection device, the dust filtration net filth blockage detection device include the transmitting and receiving module connected by connector and detection mould
Block, the detection module include light emitting devices for emitting from light to dirt filtrating screen and for receiving the transmission through dirt filtrating screen
Light or light-sensitive element Jing Guo the irreflexive reflected light of dirt filtrating screen, the transmitting and receiving module is for controlling the light emitting dress
The luminous and intensity of illumination of the transmitted light for receiving the light-sensitive element or reflected light is set to be converted into for indicating filter
The numerical value of the dirty stifled degree of dirt net.
16. the fire alarm system according to claim 13 or 15, which is characterized in that the light emitting devices is infrared hair
Optical diode；Light-sensitive element is photodiode or phototriode.
17. a kind of household electrical appliance, which is characterized in that including any fire alarm system of claim 9~15.
18. household electrical appliance according to claim 17, which is characterized in that the household electrical appliance include empty tempered air
Filter.
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| CN108088030B (en) * | 2017-11-01 | 2020-07-14 | 珠海格力电器股份有限公司 | Method and device for detecting filth blockage of air conditioner filter screen |
| CN109637072A (en) * | 2019-02-18 | 2019-04-16 | 芜湖真玛信息科技有限公司 | A kind of household kitchen fire alarm |
| CN111380145A (en) * | 2020-03-19 | 2020-07-07 | 中国建筑科学研究院有限公司 | Fresh air quantity real-time monitoring method for fresh air machine |
| CN111516457A (en) * | 2020-04-30 | 2020-08-11 | 三一重机有限公司 | Blockage detection method and device and engineering machinery |
| CN111579717B (en) * | 2020-05-07 | 2021-08-17 | 成都千嘉科技有限公司 | Breathing hole blockage detection method and device, readable medium and gas-sensitive alarm equipment |
| CN117310094B (en) * | 2023-09-27 | 2024-05-24 | 华能汕头海门发电有限责任公司 | Wearable equipment with gas detection alarming function |
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