CN110346405A - A kind of gas-cooker anti-dry detection method, detection device and gas-cooker - Google Patents
A kind of gas-cooker anti-dry detection method, detection device and gas-cooker Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of gas-cooker anti-dry detection method, detection device and gas-cooker, then the infrared energy E1 issued by the emissivity α and the bottom of a pan itself that obtain the bottom of a pan passes through formula E1=α δ T4Cooking bottom temperature T is calculated, judges whether gas-cooker is in dry-fire condition according to cooking bottom temperature T, if being in dry-fire condition, closing gas valve or alarm；Therefore, the present invention calculates cooking bottom temperature by the bottom of a pan emissivity obtained, when using different pots, cooking bottom temperature is calculated using the rate meter in the corresponding the bottom of a pan, obtain more accurate temperature value, it solves the problems, such as to cause thermometric inaccurate because pot body emmisivity difference is larger in the prior art, improves the accuracy of the cooking bottom temperature detected, improve the accuracy of anti-dry control.
Description
Technical field
The invention belongs to gas-cooker technical fields, specifically, being to be related to a kind of gas-cooker anti-dry detection method, detection
Device and gas-cooker.
Background technique
Gas-cooker is the daily necessity of family's indispensability, has very important status in daily life.
Gas cooker has a wide range of application, and culinary art easily is forgotten to monitor, and continues dry combustion method after causing dry pot, damages cookware or causes
Fire.Anti-dry system can effectively detect dry-fire condition, alarm or close in time air valve to user.
Current anti-dry scheme has the disadvantages that
One, anti-dry is contacted using used temperature measuring equipment using thermocouple or thermistor etc. in existing gas-cooker
Formula temperature sensor, temperature measuring equipment directly contact the bottom of a pan or contact the bottom of a pan thermometric by metal shell, and temperature measuring equipment must be with
The bottom of a pan contact.Heat passes to temperature measuring equipment by heat transfer by the bottom of a pan, and poor contact can generate large error.To avoid high temperature
Flame directly heats temperature measuring equipment, causes large error, and burner needs to carry out special designing, and design is limited.See
CN101382303B, there are certain defect, flames easily to directly heat to temperature probe for this structure, generates interference；Temperature probe
It is also easy to bring measurement error with the bottom of a pan poor contact.
Two, existing program detects cooking bottom temperature using infrared temperature-test technology, and is applied in gas-cooker, but gas-cooker is deposited
In flame, flame can generate certain interference.Although flame intensity is very low, the infra-red radiation issued still can be to thermometric
As a result it has an impact.To solve this problem, it is currently used for the infrared measurement of temperature scheme of gas-cooker, such as CN 102374529A, CN
102374530A has used metal isolation ring to separate flame, and metal isolation ring is close to the bottom of a pan, and temperature measuring equipment still needs and the bottom of a pan
Contact.The drawbacks of this design without improving thermojunction type conventional gas stove thermometric mode completely, poor contact is still easy band
Carry out error, flame directly is also easy to bring error to the heating of metal isolation ring, to reduce flame bring heat, burner structure
Need special optimization.
Three, it is currently used for the infrared measurement of temperature scheme of gas-cooker, thermometric accuracy is influenced very big by the bottom of a pan emissivity.It is existing
There is the infrared measurement of temperature scheme for gas-cooker to use common full spectral coverage infrared detector (being commonly generally 5.5~14um),
When the detection emmisivity difference of pot is larger, very big detection error can be brought.For example, mutually synthermal black iron pan and stainless steel
Put one's cards on the table pot, since the infrared emittance difference of the two is larger, if detected using identical full spectral coverage infrared detector, signal is strong
Degree has larger difference, and the temperature value error obtained is up to tens degree.A small number of schemes use high temperature resistant such as CN 102374530A
Sheet metal contact the bottom of a pan, infrared measurement of temperature it is actually detected be refractory metal piece infrared intensity, not by the bottom of a pan emissivity
Influence.But temperature measuring equipment is contact, does not play the non-contact advantage of infrared measurement of temperature, loses the meaning of infrared measurement of temperature
Justice, and not can avoid the influence of poor contact and flame heating metal isolation ring interference.
Summary of the invention
The present invention provides a kind of gas-cooker anti-dry detection methods, improve the accuracy of the cooking bottom temperature detected,
Improve the accuracy of anti-dry control.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following scheme:
A kind of gas-cooker anti-dry detection method, which comprises
The infrared energy E1 that the emissivity α and the bottom of a pan itself for obtaining the bottom of a pan are issued；
According to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；
Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；
If so, closing gas valve or alarm.
Further, the infrared energy E1 that the emissivity α for obtaining the bottom of a pan and the bottom of a pan itself issue；Specific packet
It includes:
Infrared radiation pulses are issued to the bottom of a pan by calibration light source；
The infrared energy in the bottom of a pan is received by thermometric infrared detector and is converted to electric signal V；The electric signal V is
The superposition of direct current signal V1 and pulse signal V2；
The infrared energy E1 that the bottom of a pan itself issues is obtained according to direct current signal V1；
Calculate the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；
Calculate infrared emittance α=1- β in the bottom of a pan.
Further, optical filter is installed on the thermometric infrared detector, the optical filter is narrow bandpass optical filtering
The central wavelength of piece, the optical filter is within the scope of 3.4um~4.4um；Calibration light source issue infra-red radiation wavelength with
The optical filter is corresponding.
Further, the detection method further include:
After the emissivity for obtaining the bottom of a pan, calibration light source is closed；
Judge whether to change pot according to the electric signal V that thermometric infrared detector exports；
If so, reopening calibration light source, the infrared reflectivity in the bottom of a pan is detected again.
A kind of gas-cooker anti-dry detection device, comprising:
Infrared detection module, fingerprint identification module, the infrared energy E1 that emissivity α and the bottom of a pan itself for obtaining the bottom of a pan are issued；
Judgment module, for according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is that this special fence-Boltzmann is normal
Number；Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；If so, closing gas valve or alarm.
Further, the infrared detection module, fingerprint identification module includes:
Calibration light source, for issuing infrared radiation pulses to the bottom of a pan；
Thermometric infrared detector, for receiving the infrared energy in the bottom of a pan and being converted to electric signal V；The electric signal V
For the superposition of direct current signal V1 and pulse signal V2；
Computing module is inquired, for obtaining the infrared energy E1 that the bottom of a pan itself issues according to direct current signal V1；It calculates
Reflectivity β=the V2*m in the bottom of a pan, wherein m is constant；Calculate infrared emittance α=1- β in the bottom of a pan.
Further, optical filter is installed on the thermometric infrared detector, the optical filter is narrow bandpass optical filtering
The central wavelength of piece, the optical filter is within the scope of 3.4um~4.4um；Calibration light source issue infra-red radiation wavelength with
The optical filter is corresponding.
Further, the inquiry computing module is also used to, and is judged according to the electric signal V of thermometric infrared detector output
Whether pot is changed.
A kind of gas-cooker, including burner and above-mentioned anti-dry detection device.
Further, the anti-dry detection device is laid in the side of burner, towards the bottom of a pan central location；Alternatively,
Light hole is offered in the central location of the burner, the detection device is laid in the underface of the light hole.
Compared with prior art, the advantages and positive effects of the present invention are: gas-cooker anti-dry detection method of the invention,
Detection device and gas-cooker, the infrared energy E1 issued by the emissivity α and the bottom of a pan itself that obtain the bottom of a pan, then lead to
Cross formula E1=α δ T4Cooking bottom temperature T is calculated, judges whether gas-cooker is in dry-fire condition according to cooking bottom temperature T, if being in
Dry-fire condition, then closing gas valve or alarm；Therefore, the present invention calculates cooking bottom temperature by the bottom of a pan emissivity obtained, when making
When with different pots, cooking bottom temperature is calculated using the rate meter in the corresponding the bottom of a pan, more accurate temperature value is obtained, solves existing skill
Because of the larger problem for leading to thermometric inaccuracy of pot body emmisivity difference in art, the accuracy of the cooking bottom temperature detected is improved,
Improve the accuracy of anti-dry control.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of gas-cooker proposed by the invention；
Fig. 2 is the structural schematic diagram of another embodiment of gas-cooker proposed by the invention；
Fig. 3 is the main view of one embodiment of gas-cooker anti-dry detection device proposed by the invention；
Fig. 4 is the top view of Fig. 3；
Fig. 5 is the structure chart of another embodiment of gas-cooker anti-dry detection device proposed by the invention；
Fig. 6 is the pulse signal that calibration light source issues；
Fig. 7 is the signal that thermometric infrared detector receives；
Fig. 8 is the flow chart of one embodiment of gas-cooker anti-dry detection method proposed by the invention.
Appended drawing reference:
P, anti-dry detection device；1, the bottom of a pan；2, burner；2-1, light hole；3, glass baffle plate；
4, bottom plate；5, bracket；6, calibration light source；7, thermometric infrared detector；7-1, condenser；8, optical filter；9, circuit
Plate；10, semi-transparent semi-reflecting lens.
Specific embodiment
A specific embodiment of the invention is described in more detail with reference to the accompanying drawing.
The material of pot is different, and reflectivity is different, and the emissivity of pan with black bottom generally can be to 0.9, and stainless steel pot of putting one's cards on the table exists
Near 0.4.If using identical emissivity to calculate using when different pots, temperature measurement error will necessarily be introduced.For the technology
Problem, the present embodiment propose a kind of gas-cooker anti-dry detection method, detection device and gas-cooker, anti-by the detection the bottom of a pan
Rate is penetrated, cooking bottom temperature is calculated according to the bottom of a pan reflectivity, the accuracy of the cooking bottom temperature detected is improved, improves anti-dried burning control
The accuracy of system.
In the following, gas-cooker, anti-dry detection device and anti-dry detection method are described in detail.
The gas-cooker of the present embodiment mainly includes burner 2 and anti-dry detection device P.In the central position of burner 2
It sets and offers light hole 2-1, anti-dry detection device P is laid in the underface of light hole 2-1, fixed with the bottom plate 4 of gas-cooker
Together, shown in Figure 1.
Anti-dry detection device P is located at the underface of burner light hole, with burner 2 apart from farther out, not will receive combustion
The interference of 2 high temperature of burner.Light hole 2-1 is the through-hole of circle or other shapes, and the infra-red radiation in the bottom of a pan 1 passes through light hole 2-1
Anti-dry detection device P is reached, the Assurance of Size of light hole 2-1 does not block the visual field S of anti-dry detection device P.In light hole
Glass baffle plate 3 is installed on the upper surface 2-1, prevents dust from descending slowly and lightly by light hole 2-1 to the anti-dry detection device P of lower section
On, glass baffle plate 3, and can be with resistance to certain high temperature, such as sapphire using the material that can penetrate infrared radiation wavelength.
As another preferred design of the present embodiment, anti-dry detection device P is laid in the branch of 2 side of burner
On frame 5, and towards 1 central location of the bottom of a pan, bracket 5 is fixed on the bottom plate 4 of gas-cooker；It is offered on the hearth of gas-cooker logical
Unthreaded hole is fixed with glass baffle plate 3, the surface of glass baffle plate 3 and hearth flush on light hole, and glass baffle plate 3 is for preventing
Only dust descends slowly and lightly through light hole to anti-dry detection device P, and the infra-red radiation in the bottom of a pan passes through glass baffle plate 3, light hole is injected and prevented
Dry combustion method detection device P, it is shown in Figure 2.Anti-dry detection device P favours the vertical line in the bottom of a pan, through gas-cooker when detection
Flame detects cooking bottom temperature.The benefit designed in this way is: the visual field S of anti-dry detection device P is not by the screening of burner 2
Gear；Be conducive to gas-cooker fuel design, burner center does not need to open up light hole, does not influence central flame, can be used general
Logical burner, is also particularly suitable for moderate heat direct spray type gas stove.
Anti-dry detection device P mainly includes the following steps, for executing following anti-dry detection methods referring to Fig. 8
It is shown.
Step S1: the infrared emittance α in the bottom of a pan is obtained.
It when infrared ray is irradiated on object, energy or is absorbed, or is reflected by the object, or penetrate object by object.According to
Law of conservation of energy, incident energy=absorption energy+reflection energy+transmission energy.
Therefore, absorptivity+reflectivity+transmissivity=100%.
If object be it is opaque, transmissivity 0, then above-mentioned formula becomes:
Absorptivity+reflectivity=100%.
Any opaque article, while in absorption, reflection, the infrared energy (thermal energy) of transmitting.
If object absorbs infrared energy (thermal energy), its temperature can rise.When object is in Isothermal Condition, it launches
Energy and absorption energy be it is identical, therefore, absorptivity=emissivity, above-mentioned formula becomes:
Emissivity+reflectivity=100%.
State at pot on gas-cooker can be approximately considered absorptivity=emissivity, therefore, the emissivity in the bottom of a pan
α+reflectivity β=100%.Therefore, then emissivity α=1- β can be calculated by the reflectivity β in the detection the bottom of a pan.
After gas combustion range ignition, whether there is pot on detection gas-cooker first.If there is pot, following step S2 is continued to execute.If
Without pot, whether there are pot or warning note on sustainable detection gas-cooker.
It can judge whether there is pot on gas-cooker by detecting the bottom of a pan reflectivity β (or emissivity α).If reflectivity β (or transmitting
Rate α) in the range of setting, then determine there is pot on gas-cooker；If reflectivity β (or emissivity α) not in the range of setting,
Determine on gas-cooker without pot.
Step S2: the infrared energy E1 that the bottom of a pan itself issues is obtained.
Step S3: according to formula E1=α δ T4, calculate cooking bottom temperature T.
By E1=α δ T4It can releaseCalculate T.Wherein, δ is this special fence-Boltzmann constant, for details, reference can be made to
This special fence-Boltzmann law, details are not described herein again.
Step S4: judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T.
If cooking bottom temperature T >=set temperature threshold value (such as 298 DEG C), illustrates that cooking bottom temperature is very high, then determines at gas-cooker
In dry-fire condition, S5 is thened follow the steps: closing gas valve or alarm.
The gas-cooker anti-dry detection method of the present embodiment is issued by the emissivity α and the bottom of a pan itself that obtain the bottom of a pan
Infrared energy E1, then pass through formula E1=α δ T4Cooking bottom temperature T is calculated, gas-cooker is judged according to cooking bottom temperature T
Whether dry-fire condition is in, if being in dry-fire condition, closing gas valve or alarm；Therefore, the detection method of the present embodiment is led to
It crosses the bottom of a pan emissivity obtained and calculates cooking bottom temperature, when using different pots, calculate the bottom of a pan using the rate meter in the corresponding the bottom of a pan
Temperature obtains more accurate temperature value, and solve leads to thermometric inaccuracy because pot body emmisivity difference is larger in the prior art
Problem improves the accuracy of the cooking bottom temperature detected, improves the accuracy of anti-dry control.
In the present embodiment, anti-dry detection device P includes infrared detection module, fingerprint identification module and judgment module.Infrared detection module, fingerprint identification module is used
In executing step S1~S2, judgment module is for executing step S3~S5.
Infrared detection module, fingerprint identification module includes calibration light source 6, thermometric infrared detector 7, inquiry computing module, referring to Fig. 3, Fig. 4 institute
Show, inquires computing module and judgment module, can be integrated on the same circuit board 9.
Calibration light source 6: for issuing infra-red radiation to the bottom of a pan 1, it is red that the light issued enters thermometric after the bottom of a pan 1 is reflected
External detector 7.
Thermometric infrared detector 7: electricity is converted into for receiving the infrared energy in the bottom of a pan, and by the optical signal received
Signal, such as thermoelectric pile, pyroelectricity, indium gallium arsenic photodiode, selenium sulfide detector type of sensors.
The visual angle of thermometric infrared detector 7 determines that the area of its search coverage, last temperature value are according to entire detection
What the thermal infrared radiation total amount in region obtained.Thermometric infrared detector 7 arrives the distance in the bottom of a pan 1 farther out, thermometric infrared detector 7
Field angle is limited to less than 10 degree, in this way can be by burner from the infra-red radiation that the bottom of a pan reaches thermometric infrared detector 7
The light hole 2-1 of centre is blocked or is interfered without being burned device.There is condenser 7-1 in the front end of thermometric infrared detector 7,
Lens type or reflective condenser can be used for limiting the field angle of detector, shown in Figure 3.
Infrared fileter 8 is installed on thermometric infrared detector 7, optical filter is narrow-band pass filter, in optical filter
Cardiac wave is long within the scope of 3.4um~4.4um, and passband half-peak breadth is or more wider less than 5% central wavelength, in passband
There is very high transmitance, it is very low in the transmitance of its all band, optical means can be used in this way rather than metal sleeve row
Except the interference of flame.Common infrared detector generally has wider detection range, such as 8~14um, and detection range is wider, fire
Flame has multiple stronger infrared emission wave bands, and a portion can be fallen in detection range, causes very big interference to infrared measurement of temperature.
Optically rather than mechanical means reduces interference of the flame infrared light to measurement result, uses the transparent spectral window of flame
The wave band of (excluding flame interference), is located at 7 wavelength of thermometric infrared detector in flame transparency window mouth region, reduces the infrared spoke of flame
The interference to temperature-measuring results is penetrated, the non-cpntact measurement cooking bottom temperature in gas-cooker is achieved, to realize non-contact anti-dry
Burn function.The wavelength for the infra-red radiation that calibration light source issues is corresponding with the optical filter, and optical filter is narrow-band pass filter, filters
The central wavelength of piece is within the scope of 3.4um~4.4um, the influence for avoiding flame from detecting the bottom of a pan emissivity.
In the present embodiment, calibration light source 6 and thermometric infrared detector 7 can be laid side by side, referring to shown in Fig. 3, Fig. 4,
Structure is compact, and occupied space is smaller.
As another preferred design of the present embodiment, infrared detection module, fingerprint identification module further includes that semi-transparent semi-reflecting lens 10 are (or real
Body prism), calibration light source 6 and thermometric infrared detector 7 can be combined by semi-transparent semi-reflecting lens 10 (or solid prism), referring to figure
Shown in 5.The light that calibration light source 6 issues passes through semi-transparent semi-reflecting lens 10 and is incident upon the bottom of a pan, and the infra-red radiation that the bottom of a pan issues is through semi-transparent semi-reflecting
Mirror 10 reflexes to thermometric infrared detector 7.The light that this structure can be such that calibration light source 6 issues connects with thermometric infrared detector 7
The infrared light received is coaxial (i.e. the beam axis of two-beam is overlapped), i.e., the light that calibration light source 6 issues passes through semi-transparent semi-reflecting lens 10
Transmission path afterwards and the transmission path that the infrared light that the bottom of a pan issues is incident upon semi-transparent semi-reflecting lens 10 are essentially identical, the interference such as anti-dust
Ability it is stronger.
Specifically, it is issued by the infrared emittance α and the bottom of a pan itself in the infrared detection module, fingerprint identification module acquisition the bottom of a pan infrared
Radiation energy E1；Specifically include the following steps:
Step S21: calibration light source issues infrared radiation pulses to the bottom of a pan, shown in Figure 6.
Laser can be used in calibration light source, and the calibration light source of the forms such as tungsten lamp, LED, laser also can be used, and use is this kind of
When light source, the angle of divergence of light source is limited, and keeps its range of exposures and the visual field of thermometric infrared detector close.It can lead to
Cross the angle of divergence of the limiting light sources such as lens, reflecting mirror, diaphragm.The light of its all band also can be used in calibration light source, as visible light,
Ultraviolet light etc., but it is most accurate using the reflectivity that infrared light light source measures.
Step S22: the infrared energy in the bottom of a pan is received by thermometric infrared detector and is converted to electric signal V；It is described
Electric signal V is the superposition of direct current signal V1 and pulse signal V2.
Thermometric infrared detector receives the infra-red radiation that the bottom of a pan itself issues, while also receiving the correction reflected through the bottom of a pan
The infrared radiation pulses that light source issues, the optical signal eventually received are the superposition of above-mentioned two signal, that is, folded for direct current signal
Add the form of pulse signal, shown in Figure 7, direct current signal represents the infrared intensity in the bottom of a pan itself, is used for infrared measurement of temperature；
Resultant signal, which subtracts direct current signal, can be obtained the infrared signal that the calibration light source for being reflected into detector through the bottom of a pan issues, this letter
Number intensity it is related with the reflectivity in the bottom of a pan, the reflectivity in the bottom of a pan is higher, then this signal is stronger.
The infra-red radiation that the infra-red radiation and the bottom of a pan itself that calibration light source through the bottom of a pan reflection issues issue is all in thermometric
Within the investigative range of infrared detector, detector detection is a wavelength band, such as 4.8um~5.0um, 3um~
5.5um etc., the light within the scope of detecting band can be all received, and the infra-red radiation reflected through the bottom of a pan necessarily also is in probing wave
In segment limit.Calibration light source can be the laser light source of only one wavelength, or the wider LED of wavelength band, tungsten lamp
Etc. types light source, calibration light source issue infrared ray all or part be in the investigative range of detector.
It inquires computing module and executes following step S23~S25.
Step S23: the infrared energy E1 that the bottom of a pan itself issues is obtained according to direct current signal V1.
There is corresponding relationship between the electric signal and radiation energy of the output of thermometric infrared detector, thermoelectric pile, photoelectricity are visited
The different detectors such as device are surveyed, corresponding relationship is different.For most detectors, radiation that output signal voltage V ∝ is received
ENERGY E.
Table is corresponded to by inquiring preset detector model-output electric signal-radiation energy, obtains the corresponding spoke of electric signal
Penetrate energy.The correspondence table can be obtained using the measurement of standard black body radiation source.
For example, the emissivity α 0 in standard black body radiation source is 1, infrared detector receives the radiation energy in standard black body radiation source
Amount, and electric signal V0 is exported, temperature value T0 is calculated, according to formula E0=α 0* δ * T04E0 is calculated, δ is this special fence-Bohr
Hereby graceful constant.Different radiation energies, corresponding different output electric signal and temperature value.Therefore, using the infrared of different model
Detector obtains corresponding electric signal, temperature value, radiation energy using the above method, generates detector model-output telecommunications
Number-radiation energy corresponds to table.
Therefore, by inquiring corresponding table, the corresponding E1 of V1 is obtained.
Step S24: the reflectivity β=V2*m in the bottom of a pan is calculated, wherein m is constant.
Constant m is related with thermometric infrared detector and calibration light source, can be measured by standard reflecting plate.For example, utilizing
Identical infrared detector, identical calibration light source, the standard reflecting plate that known reflectivity is β 0 are tested, calibration light source
Infra-red radiation is irradiated on standard reflecting plate, is received after standard reflecting plate reflects by infrared detector, and exports electric signal V0,
Then m=β 0/V0 is calculated.
Step S25: infrared emittance α=1- β in the bottom of a pan is calculated.
After obtaining reflectivity β, using formula α=1- β, α is calculated.
Finally, judgment module is according to formula E1=α δ T4, calculate cooking bottom temperature T；And judge whether gas-cooker is in dry combustion method
State.
Then the present embodiment calculates emissivity value, when using different pots, uses corresponding hair by measurement reflectance value
The rate of penetrating calculates cooking bottom temperature, obtains more accurate temperature value.
After the infrared emittance for obtaining the bottom of a pan, calibration light source is closed；But in gas-cooker use process, it may occur that
The case where midway is changed pot, therefore, the electric signal V judgement that inquiry computing module also needs to be converted into according to thermometric infrared detector is
It is no to change pot；If so, reopening calibration light source, the infrared reflectivity in the bottom of a pan, survey caused by avoiding as changing pot are detected again
Warm error.It will lead to the output electric signal exception of thermometric infrared detector due to changing pot halfway, when electric signal exception, then
It needs to detect the bottom of a pan reflectivity again, extinguish obtaining the bottom of a pan reflectivity post-equalization light source.
The gas-cooker anti-dry detection method, anti-dry detection device and gas-cooker of the present embodiment, by using infrared survey
Temperature technique, realize it is non-contact cooking bottom temperature is more accurately detected, realize gas-cooker contactless dry-fire condition detection, phase
Compared with contact detection scheme in the prior art, interference of the poor contact to thermometric is eliminated；By detecting the reflectivity in the bottom of a pan,
The emissivity for calculating the bottom of a pan reduces bring thermometric error due to the bottom of a pan emissivity difference, makes temperature-measuring results more
Accurately, the false alarm or the alert phenomenon of understatement for reducing anti-dry, allow gas-cooker to be applicable in wider cookware type；Pass through
Optical filter is laid on thermometric infrared detector, using the interference of optical means isolation flame infra-red radiation, compared to existing skill
The method completely cut off in art using metal sleeve, optical means realize contactless, and more succinctly, beautiful, gas-cooker layout designs are more
Flexibly.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of gas-cooker anti-dry detection method, it is characterised in that: the described method includes:
The infrared energy E1 that the emissivity α and the bottom of a pan itself for obtaining the bottom of a pan are issued；
According to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；
Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；
If so, closing gas valve or alarm.
2. according to the method described in claim 1, it is characterized by: the emissivity α for obtaining the bottom of a pan and the bottom of a pan itself are sent out
Infrared energy E1 out；It specifically includes:
Infrared radiation pulses are issued to the bottom of a pan by calibration light source；
The infrared energy in the bottom of a pan is received by thermometric infrared detector and is converted to electric signal V；The electric signal V is direct current
The superposition of signal V1 and pulse signal V2；
The infrared energy E1 that the bottom of a pan itself issues is obtained according to direct current signal V1；
Calculate the reflectivity β=V2*m in the bottom of a pan, wherein m is constant；
Calculate infrared emittance α=1- β in the bottom of a pan.
3. according to the method described in claim 2, it is characterized by: be equipped with optical filter on the thermometric infrared detector,
The optical filter is narrow-band pass filter, and the central wavelength of the optical filter is within the scope of 3.4um~4.4um；Calibration light source
The wavelength of the infra-red radiation of sending is corresponding with the optical filter.
4. according to the method described in claim 2, it is characterized by: the detection method further include:
After the emissivity for obtaining the bottom of a pan, calibration light source is closed；
Judge whether to change pot according to the electric signal V that thermometric infrared detector exports；
If so, reopening calibration light source, the infrared reflectivity in the bottom of a pan is detected again.
5. a kind of gas-cooker anti-dry detection device, it is characterised in that: include:
Infrared detection module, fingerprint identification module, the infrared energy E1 that emissivity α and the bottom of a pan itself for obtaining the bottom of a pan are issued；
Judgment module, for according to formula E1=α δ T4, calculate cooking bottom temperature T；Wherein δ is this special fence-Boltzmann constant；Root
Judge whether gas-cooker is in dry-fire condition according to cooking bottom temperature T；If so, closing gas valve or alarm.
6. device according to claim 5, it is characterised in that: the infrared detection module, fingerprint identification module includes:
Calibration light source, for issuing infrared radiation pulses to the bottom of a pan；
Thermometric infrared detector, for receiving the infrared energy in the bottom of a pan and being converted to electric signal V；The electric signal V is straight
Flow the superposition of signal V1 and pulse signal V2；
Computing module is inquired, for obtaining the infrared energy E1 that the bottom of a pan itself issues according to direct current signal V1；Calculate the bottom of a pan
Reflectivity β=V2*m, wherein m is constant；Calculate infrared emittance α=1- β in the bottom of a pan.
7. device according to claim 6, it is characterised in that: optical filter is installed on the thermometric infrared detector,
The optical filter is narrow-band pass filter, and the central wavelength of the optical filter is within the scope of 3.4um~4.4um；Calibration light source
The wavelength of the infra-red radiation of sending is corresponding with the optical filter.
8. device according to claim 6, it is characterised in that: the inquiry computing module is also used to, infrared according to thermometric
The electric signal V of detector output judges whether to change pot.
9. a kind of gas-cooker, it is characterised in that: the anti-dry including burner and as described in any one of claim 5 to 8
Detection device.
10. gas-cooker according to claim 9, it is characterised in that: the anti-dry detection device is laid in burner
Side, towards the bottom of a pan central location；
Alternatively, offering light hole in the central location of the burner, the detection device is being laid in the light hole just
Lower section.
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| CN201810291154.9A CN110346405B (en) | 2018-04-03 | 2018-04-03 | Gas stove dry combustion preventing detection method, detection device and gas stove |
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| CN201810291154.9A CN110346405B (en) | 2018-04-03 | 2018-04-03 | Gas stove dry combustion preventing detection method, detection device and gas stove |
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| US6169486B1 (en) * | 1999-07-19 | 2001-01-02 | General Electric Company | Monitoring and control system for monitoring the temperature of a glass ceramic cooktop |
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Effective date of registration: 20230512 Address after: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant after: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. Applicant after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Road, Laoshan District, Qingdao, Qingdao, Shandong Province, No. 1 Applicant before: QINGDAO HAIER SMART TECHNOLOGY R&D Co.,Ltd. |