CN102078133A - Electric food warmer and method thereof for automatically identifying water state after dry burning - Google Patents
Electric food warmer and method thereof for automatically identifying water state after dry burning Download PDFInfo
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- CN102078133A CN102078133A CN 201010558416 CN201010558416A CN102078133A CN 102078133 A CN102078133 A CN 102078133A CN 201010558416 CN201010558416 CN 201010558416 CN 201010558416 A CN201010558416 A CN 201010558416A CN 102078133 A CN102078133 A CN 102078133A
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Abstract
The invention discloses an electric food warmer and a method thereof for automatically identifying a water state after dry burning. The electric food warmer comprises a pot body, a cover and an liner arranged in the pot body, wherein a heating device, a bottom temperature measuring device for detecting the temperature of the liner and a control device are arranged in the pot body; the control device comprises a main controller, and a counter, a temperature storage, a measurement time storage, a decision value storage, a temperature variation storage and a timer, which are connected with the main controller respectively; the output end of a temperature sensor is connected with the input end of the main controller; and the output end of the main controller is electrically connected with a heating device. Whether water adding action is performed after dry burning is judged according to the velocity of variation of the measured temperature, an alarm is given, and the electric food warmer is converted into a safety mode; and thus, a safety hazard caused by long-term dry burning is avoided, and the phenomenon that food is undercooked as the electric food warmer enters the safety mode immediately upon the detection of drying burning is eliminated. The method disclosed by the invention is simple and accurate in measurement, and is suitable for electric cookers, electric slow cookers, electric fire pots and other electric food warmer products.
Description
Technical field
The invention belongs to the transformation of the electric food warmer technology of products such as comprising electric cooker, electric cooking pot, add the water state method of identification automatically after particularly a kind of electric food warmer and the dry combustion method thereof.
Background technology
The various computermatic electric food warmer of Chu Shouing generally all is provided with the dry-fire condition detection in the market, if detect dry-fire condition when cooking food, just enters keeping warm mode immediately, prevents that the too high generation of temperature is dangerous.But the user is sometimes when cooking food, and it is on the low side or forget and discharge water that water is put, enters insulation immediately after detecting dry combustion method as electric food warmer, can cause the food of cooking not yet done like this.
In addition, also there is the part electric food warmer to be lower than the uniform temperature value on the market and is judged as the water state that adds after the dry combustion method according to the temperature in the interior pot the bottom of a pan, but the judgement temperature in this determination methods is single temperature spot, and the user adds the temperature of water is different, and the amount that adds water also varies, in addition the environment temperature difference, comprehensive above-mentioned all conditions, temperature spot of single judgement judges to have or not and adds hydrodynamic(al) and do that very science is not easy to erroneous judgement again, influences the quality and the performance of product.
Summary of the invention
The problem to be solved in the present invention provides and a kind ofly can detect new type electric heating pot and the detection method thereof that adds water state after dry combustion method exactly, detects in the special time after dry combustion method to add water state, and electric food warmer keeps operate as normal, guarantees the cooking quality of food.
For solving the problems of the technologies described above, first kind of technical scheme of the present invention is:
A kind of electric food warmer, comprise a pot body, lid and place the interior inner bag of pot body, be provided with heater in the described pot body, be used to detect the end thermal detector of inner bag temperature and the control device of control electric food warmer work, described control device comprises master controller and the counter that is connected with master controller respectively, temperature memory, detection time memory, decision content memory, temperature variation memory, first timer and second timer, the output of temperature sensor is connected with the input of master controller, and the output of master controller (7) is electrically connected with heater (4).
Further, described control device also comprises the time of fire alarming memory that is electrically connected with master controller, is preset with warning binding hours ts in the time of fire alarming memory.
Further, be preset with in the memory described detection time end thermal detector detect in the time interval △ t of pot temperature, be preset with in the decision content memory and add water state decision content N, be preset with in the temperature variation memory and judge the temperature gap M that adds water state.The preferred value N of described each parameter is 3, and M is 3 ℃, and △ t was 5 seconds, and ts is 3 minutes.
Further, also be provided with the alarm that is electrically connected with master controller in the described pot body.
Second technical scheme of the present invention is:
Add the water state control method of the method for identification automatically after the above-mentioned electric food warmer dry combustion method, comprise following each stage:
S1, preparatory stage: master controller carries out zero clearing to the data n in the counter, enters the S2 stage;
S2, detection-phase: master controller carries out zero clearing to the data t1 in first timer and picks up counting, and receives the interior pot temperature T that end thermal detector detects
N, and with the data T in the temperature memory
LBe updated to pot temperature in this; When the time t1 that gets when the first timer meter reached temperature detection time interval △ t default in memory detection time, master controller received the interior pot temperature T that end thermal detector detects
N, and enter the S3 stage;
S3, decision stage: the interior pot temperature T that master controller detects end thermal detector
NWith the T in the temperature memory
LCarry out following comparison, the result relatively has two kinds of situations:
A, if T
NMore than or equal to T
L, get back to the S2 stage; If T
NLess than T
L, then with T
LWith T
NDifference △ T and the temperature variation memory in default temperature gap M carry out following comparison:
B, if △ T less than M, get back to the S2 stage; If △ T is more than or equal to M, then master controller adds 1 renewal processing to the data n in the counter, and default decision content N compares in data n after will upgrading and the decision content memory, and comparative result is as follows:
B1, if n less than decision content N, then get back to the S2 stage and restart;
B2, if n reaches decision content N, master controller is judged electric food warmer at this moment for adding water state, the S3 stage finishes.
Further, add the water state control method of the method for identification automatically after the described electric food warmer dry combustion method, the preferred value N of described each parameter is 3, and M is 3 ℃, and △ t was 5 seconds, and ts is 3 minutes.
Add after the above-mentioned electric food warmer dry combustion method in the control method of the automatic method of discerning of water state, described control device also comprises the time of fire alarming memory that is electrically connected with master controller, and described recognition methods also comprises:
S0, warning stage: master controller carries out zero clearing to the data t2 in second timer and picks up counting, detect simultaneously and judge whether to add water state, if master controller judges that electric food warmer is after having added water state after the dry combustion method, continue the duty that keeps dry-fire condition preceding; If master controller judges that electric food warmer is not add water state after the dry combustion method, then default warning binding hours ts compares in time t2 that the second timer meter is got and the time of fire alarming memory, if t2 is more than or equal to ts, master controller finishes warning stage S0, enters safe condition; If t2 is less than ts, master controller adds the detection of water state again.
Add after the above-mentioned electric food warmer dry combustion method in the control method of the automatic method of discerning of water state: also be provided with the alarm that is electrically connected with master controller in the described pot body, alarm is an acoustical generator, described recognition methods is carried out the alarm user by the sound means and is added water, in the pre-set time in warning stage, if detecting, master controller do not add water, then continue to report to the police,, also do not detect the user and add water if the time arrives, the warning of electric food warmer is disengaged, and stops the prompting of sound.
The present invention with respect to the beneficial effect of prior art is:
The present invention adopts devices such as the end thermal detector of electric food warmer and control device that electric food warmer is carried out abstract and modeling at the temperature curve that adds after the dry combustion method under the water state, rate of change by detected temperatures, whether add the hydrodynamic(al) work after judging dry combustion method, and report to the police and be transformed into safe mode, both avoided the potential safety hazard that causes because of long-time dry combustion method, can not enter safe mode immediately and cause food cooking not yet done again because of detecting dry combustion method, give user's more space and selection, design hommization more, and method is simple, detect accurately, be applicable to electric cooker, electric cooking pot, electric food warmer products such as electric chafing dish.
Description of drawings
Fig. 1 is the structural representation of embodiment electric cooker;
Fig. 2 is the circuit module schematic diagram of embodiment electric cooker;
Dry combustion method did not add the temperature-time relationship curve synoptic diagram of water when Fig. 3 worked for the embodiment electric cooker;
Dry combustion method had the temperature-time relationship curve synoptic diagram that adds water when Fig. 4 worked for the embodiment electric cooker;
Fig. 5 is for judging whether to add the flow chart of water state after the dry combustion method of embodiment electric cooker;
Fig. 6 is the warning stage flow chart after the embodiment electric cooker dry-fire condition.
The specific embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Present embodiment is that example describes with the electric cooker, as Fig. 1, shown in 2, electric cooker comprises pot body 1, place the inner bag 2 that is used to hold cooking food in pot body 1, capping device lid 3, be located at the heater 4 that in pot body 1 inner bag 2 is heated, corresponding inner bag 2 bottom outside are provided with the end thermal detector 5 that is used to detect the inner bag temperature in the pot body 1, control electric cooker the cook control device 6 and the alarm 16 of work, control device 6 includes master controller 7 and the counter 8 that is connected with master controller 7 respectively, temperature memory 9, time of fire alarming memory 10, detection time, memory 11, decision content memory 12, temperature variation memory 13, first timer 14 and second timer 15, the output of end thermal detector 5 is connected with the input of master controller 7, the output of master controller 7 and heater 4, alarm 16 is electrically connected.
Electric cooker in the course of the work, if in time do not add water after the dry combustion method, heater 4 stops heating, interior pot bottom will form temperature curve shown in Figure 3, interior pot bottom temperature is kept very little fluctuation in upper punch a little substantially to peak; In time add water if having after the electric cooker dry combustion method, interior pot bottom will form temperature curve shown in Figure 4, and interior pot bottom temperature has one and significantly falls suddenly after after water injection.This temperature steep drop trend only adds water and just can form, and belongs to the inherent characteristic of electric cooker and has uniqueness, and the temperature curve that does not add water after the control procedure dry combustion method of electric cooker according to itself is different with it.
According to concrete needs, decision content N can be set at 2,3,4,5 or the like, choosing of decision content N is crucial, electric cooker for the identical style of producing in batches, though structure is identical, but inevitably, in processing, aspects such as assembling, still can there be the difference in the tolerance band between the single individuality, these differences can cause single electric cooker product adding the deviation that temperature curve under the water state has certain limit after the dry combustion method, carry out a large amount of experiments by electric cooker product, and the data that obtain are carried out Mathematical Statistics Analysis, finally obtain the optimum value of N some.In the present embodiment, N is 3, and M is 3 ℃, and △ t was 5 seconds, and ts is 3 minutes.
After confirming that electric cooker is in dry-fire condition, master controller 7 enters warning stage S0, as shown in Figure 6, data t2 in second timer 15 is carried out zero clearing and picks up counting, driving alarm 15 begins to report to the police, remind user's electric cooker this moment dry-fire condition, require the user to add water, and detection judges whether to add water state simultaneously.
Electric cooker judge add water state after the dry combustion method recognition methods as shown in Figure 5, comprising:
S1, preparatory stage: the data n in 7 pairs of counters 8 of master controller is carried out zero clearing, enters the S2 stage.
S2, detection-phase: the data t1 in 7 pairs first timers 14 of master controller carries out zero clearing and picks up counting, and receives the interior pot temperature T that end thermal detector 5 detects
N, and with the data T in the temperature memory 9
LBe updated to pot temperature in this; When first timer 14 time t1 when reaching temperature detection time interval △ t default in the memory 11 detection time, master controller 7 receives the interior pot temperature T that end thermal detectors 5 detect
N, and enter the S3 stage.
S3, decision stage: the interior pot temperature T that master controller 7 detects end thermal detector 5
NWith the T in the temperature memory 9
LCarry out following comparison:
If T
NMore than or equal to T
L, get back to the S2 stage;
If T
NLess than T
L, then with T
LWith T
NDifference △ T and temperature variation memory 13 in default temperature gap M carry out following comparison:
If △ T less than M, gets back to the S2 stage;
If △ T is more than or equal to M, then the data n in 7 pairs of counters 8 of master controller adds 1 renewal processing, and default decision content N compares in data n after will upgrading and the decision content memory 12:
If n less than decision content N, then gets back to the S2 stage and restarts;
If n reaches decision content N, master controller 7 is judged electric cooker at this moment for adding water state, and the S3 stage finishes.
Master controller 7 judges that electric cooker is after having added water state after the dry combustion method, continues the course of work that keeps dry-fire condition preceding; If master controller 7 judges that electric cooker is not add water state after the dry combustion method, then with second timer 15 time t2 and time of fire alarming memory 10 in default warning binding hours ts compare, if t2 is more than or equal to ts, master controller 7 finishes warning stage S0, enters keeping warm mode; If t2 is less than ts, master controller 7 adds the detection of water state again.The electric cooker that designs like this has more intellectuality, hommization.
The present embodiment electric cooker is at warning stage, alarm 16 is an acoustical generator, carry out the alarm user by the sound means and add water, in the pre-set time, if detecting, master controller 7 do not add water, then continue to report to the police, if the time arrives, also do not detect the user and add water, the warning of electric cooker is disengaged, and stops the prompting of sound.
Claims (10)
1. electric food warmer, comprise a pot body (1), lid (3) and place inner bag (2) in pot body (1), be provided with heater (4) in the described pot body (1), be used to detect the end thermal detector (5) of inner bag temperature and the control device (6) of control electric food warmer work, it is characterized in that: described control device (6) comprises master controller (7) and the counter (8) that is connected with master controller (7) respectively, temperature memory (9), memory detection time (11), decision content memory (12), temperature variation memory (13), first timer (14) and second timer (15), the output of temperature sensor (5) is connected with the input of master controller (7), and the output of master controller (7) is electrically connected with heater (4).
2. electric food warmer according to claim 1, it is characterized in that: be preset with the time interval △ t that end thermal detector (5) detects interior pot temperature in described memory detection time (11), be preset with in the decision content memory (12) and add water state decision content N, be preset with in the temperature variation memory (13) and judge the temperature gap M that adds water state.
3. electric food warmer according to claim 2 is characterized in that: described control device (6) also comprises the time of fire alarming memory (10) that is electrically connected with master controller (7).
4. electric food warmer according to claim 3 is characterized in that: be preset with warning binding hours ts in the described time of fire alarming memory (10).
5. electric food warmer according to claim 4 is characterized in that: described N is 3, and M is 3 ℃, and △ t was 5 seconds, and ts is 3 minutes.
6. electric food warmer according to claim 4 is characterized in that: also be provided with the alarm (16) that is electrically connected with master controller (7) in the described pot body (1).
7. add the water state control method of the method for identification automatically after an electric food warmer dry combustion method according to claim 1, it is characterized in that: comprise following each stage:
S1, preparatory stage: master controller (7) carries out zero clearing to the data n in the counter (8), enters the S2 stage;
S2, detection-phase: master controller (7) carries out zero clearing to the data t1 in first timer (14) and picks up counting, and receives the interior pot temperature T that end thermal detector (5) detects
N, and with the data T in the temperature memory (9)
LBe updated to pot temperature in this; When first timer (14) count time t1 when reaching in memory detection time (11) default temperature detection time interval △ t, master controller (7) receives the interior pot temperature T that end thermal detector (5) detects
N, and enter the S3 stage;
S3, decision stage: the interior pot temperature T that master controller (7) detects end thermal detector (5)
NWith the T in the temperature memory (9)
LCarry out following comparison:
If T
NMore than or equal to T
L, get back to the S2 stage; If T
NLess than T
L, then with T
LWith T
NDifference △ T and temperature variation memory (13) in default temperature gap M carry out following comparison:
If △ T less than M, gets back to the S2 stage; If △ T is more than or equal to M, then master controller (7) adds 1 renewal processing to the data n in the counter (8), and default decision content N compares in data n after will upgrading and the decision content memory (12):
If n less than decision content N, then gets back to the S2 stage and restarts; If n reaches decision content N, master controller (7) is judged electric food warmer at this moment for adding water state, and the S3 stage finishes.
8. add the water state control method of the method for identification automatically after the described electric food warmer dry combustion method according to claim 7, it is characterized in that: it is characterized in that: described N is 3, and M is 3 ℃, and △ t was 5 seconds, and ts is 3 minutes.
9. add the water state control method of the method for identification automatically after the described electric food warmer dry combustion method according to claim 7, it is characterized in that: described control device (6) also comprises the time of fire alarming memory (10) that is electrically connected with master controller (7), and described recognition methods also comprises:
S0, warning stage: master controller (7) carries out zero clearing to the data t2 in second timer (15) and picks up counting, detect simultaneously and judge whether to add water state, if master controller (7) judges that electric food warmer is after having added water state after the dry combustion method, continue the duty that keeps dry-fire condition preceding; If master controller (7) judges that electric food warmer is not add water state after the dry combustion method, then second timer (15) is counted time t2 and time of fire alarming memory (10) in default warning binding hours ts compare, if t2 is more than or equal to ts, master controller (7) finishes warning stage S0, enters safe condition; If t2 is less than ts, master controller (7) adds the detection of water state again.
10. add the water state control method of the method for identification automatically after the electric food warmer dry combustion method according to claim 8, it is characterized in that: also be provided with the alarm (16) that is electrically connected with master controller (7) in the described pot body (1), alarm (16) is an acoustical generator, described recognition methods is in warning stage, carry out the alarm user by the sound means and add water, in the pre-set time, if detecting, master controller (7) do not add water, then continue to report to the police, if the time arrives, also do not detect the user and add water, the warning of electric food warmer is disengaged, and stops the prompting of sound.
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