CN110553284A - cooking appliance and temperature control method - Google Patents
cooking appliance and temperature control method Download PDFInfo
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- CN110553284A CN110553284A CN201910799382.1A CN201910799382A CN110553284A CN 110553284 A CN110553284 A CN 110553284A CN 201910799382 A CN201910799382 A CN 201910799382A CN 110553284 A CN110553284 A CN 110553284A
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- temperature
- electromagnetic
- sensing layer
- temperature sensing
- heating coil
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/004—Cooking-vessels with integral electrical heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/08—Pressure-cookers; Lids or locking devices specially adapted therefor
- A47J27/086—Pressure-cookers; Lids or locking devices specially adapted therefor with built-in heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/24—Warming devices
- A47J36/2483—Warming devices with electrical heating means
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J37/00—Baking; Roasting; Grilling; Frying
- A47J37/10—Frying pans, e.g. frying pans with integrated lids or basting devices
- A47J37/105—Frying pans, e.g. frying pans with integrated lids or basting devices electrically heated
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/12—Arrangement or mounting of control or safety devices
- F24C3/126—Arrangement or mounting of control or safety devices on ranges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/08—Arrangement or mounting of control or safety devices
- F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
Abstract
The invention relates to a cooking appliance, which comprises a shell, an electromagnetic generating device capable of generating an electromagnetic signal, a control unit connected with the electromagnetic generating device and capable of detecting and analyzing an electrical parameter in the electromagnetic generating device, a temperature sensing layer with a temperature characteristic change point and a temperature change layer. The temperature control device can conveniently realize the control of the temperature of the cooking utensil through the arrangement of the control unit, the electromagnetic generating device, the temperature sensing layer and the temperature changing layer.
Description
Technical Field
the invention relates to the technical field of kitchen ware, in particular to a cooking appliance and a method for controlling the temperature of the cooking appliance.
Background
The temperature of a pot heated by the existing cooking appliance, such as a gas stove and an induction cooker, can be continuously increased as long as gas supply or power supply is continuously performed, the heated temperature is difficult to control within a certain reasonable range, and the temperature can be adjusted only by manually adjusting the size of a valve. In addition, in the whole cooking process, the temperature of a user needs to be continuously adjusted according to the requirement of the cooking stage, the operation is frequent, and a lot of inconvenience in use is caused.
Disclosure of Invention
the invention aims to overcome the defects of the prior art and provide a cooking appliance convenient for realizing temperature control. In order to solve the technical problems, the invention adopts the technical scheme that:
a cooking utensil is characterized by comprising an electromagnetic generating device capable of generating an electromagnetic signal and a control unit which is connected with the electromagnetic generating device and can detect and analyze an electrical parameter in a circuit of the electromagnetic generating device, wherein the electromagnetic generating device comprises an electromagnetic coil, a temperature sensing layer capable of sensing the electromagnetic signal generated by the electromagnetic generating device is arranged on the side or above the electromagnetic generating device, the temperature sensing layer and an electromagnetic heating coil form coupling impedance, the temperature sensing layer has a temperature change initial critical value and a temperature change finishing critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the temperature change initial critical value and the temperature change finishing critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
r2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a copper wire with the diameter of 0.2mm by using a TDKPC40 magnetic rod with the diameter of 10mm and the length of 10mm, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz.
in this technical solution, the control unit can detect and analyze a change of an electrical parameter in the electromagnetic generating device, and can instruct the control switch or the heating device to change the heating power or the heating time through the change, so as to control the heating temperature.
The cooking utensil has the advantages that the electromagnetic generating device has the function of emitting electromagnetic signals, when the cooking utensil is combined with the temperature sensing layer capable of sensing the electromagnetic signals, the electric parameters in the electromagnetic generating device can be changed under the influence of the temperature sensing layer, and the control unit controls the heating power of the heating device after detecting the change of the electric parameters in the electromagnetic generating device, so that the heating temperature is controlled.
Preferably, the cooking utensil is further provided with a heating device, and the heating device is connected with the control unit. And a control switch is also arranged between the control unit and the heating device. Preferably, the heating device is a resistance heating device, an electromagnetic heating device, a microwave heating device or a gas heating device. Therefore, the cooking appliance of the patent can be an electric cooker, an electric pressure cooker, an induction cooker, an infrared oven, a halogen oven, a gas stove or the like. This patent is through control switch connection control unit and heating device, and control switch can start or close heating device, also can improve or reduce heating device's power etc..
As for the specific form of the temperature sensing layer, at least the following schemes exist:
In the first form, a panel is further disposed above or beside the electromagnetic generating device, and the panel is composed of a temperature sensing layer, or the temperature sensing layer is composed of a part of the panel and is combined in the panel, for example, in products such as an electromagnetic stove or an electric baking pan, a panel for supporting a pot or food to be heated is often disposed above the heating device, and the temperature sensing layer may be disposed as a part of the panel or as a complete part of the panel. When the temperature sensing layer forms a part of the panel and is compounded in the panel, the panel may be composed of one or more of an aluminum plate, a copper plate, a steel plate, or an iron plate and is compounded with the temperature sensing layer.
In a second form, the heating device includes a heating plate, and the heating plate is composed of a temperature sensing layer, or the temperature sensing layer is formed as a part of the heating plate and combined in the heating plate. For example, in a product such as an electric cooker or an electric pressure cooker, the temperature sensing layer may be provided as at least a part of the heat emitting disc.
In a third aspect, the temperature sensing layer is provided as a separate component, for example, the temperature sensing layer itself is made into a plate or sheet structure, or the temperature sensing layer is combined in the plate or sheet structure, the temperature sensing layer can be separated from the cooking utensil, the temperature sensing layer can be placed above or beside the electromagnetic generating device at any time when the temperature sensing layer is needed, for example, for products such as an induction cooker or an electric baking pan, the temperature sensing layer can be placed above the panel, for an electric cooker or an electric pressure cooker, the temperature sensing layer can be placed above the heating plate, and after the use, the temperature sensing layer can be taken away at any time.
In a fourth form, the cooking utensil is further provided with a pot, and the temperature sensing layer is arranged on the pot. The pot comprises a pot bottom and a pot body, wherein the pot bottom is composed of a temperature sensing layer, or the temperature sensing layer is composed of a part of the pot bottom and is compounded on the pot bottom. Preferably, the pot bottom is composed of one or more of an aluminum plate, a copper plate, a steel plate or an iron plate, that is, the pot bottom can be of a single-layer structure or a composite structure, and for a three-dimensional heating pot, the temperature sensing layer can be arranged on the pot body or on the pot body and the pot bottom.
regardless of the form of the temperature-sensitive layer, the temperature-sensitive layer can be used in cooperation with the electromagnetic generation device and the control unit as long as the temperature-sensitive layer can sense the electromagnetic signal generated by the electromagnetic generation device.
preferably, the control unit comprises a detection and analysis module and a control module, wherein the detection and analysis module is connected with the electromagnetic generating device and used for detecting the change of the electrical parameters in the circuit of the electromagnetic generating device, comparing the detection value with an initial set value and feeding back the analysis result to the control module;
The input end of the control module is connected with the detection and analysis module, the output end of the control module is connected with the heating device, and the control module controls the heating device according to the analysis result of the detection value by the detection and analysis module, so that the temperature of the temperature sensing layer is kept in a preset interval;
The electromagnetic generating device comprises an electromagnetic heating coil, a signal generating unit and a signal receiving unit, wherein the electromagnetic heating coil is respectively connected with the signal generating unit and the signal receiving unit, the signal generating unit is connected with the control module, the signal receiving unit is connected with the detection and analysis module, and the connection is preferably in an electric connection mode. The signal sent by the signal generating unit is pulse number, pulse width, pulse amplitude, voltage, current or resistance. The control module sends an instruction to the signal generating unit, for example, the control module controls the signal generating unit through Pulse Width Modulation (PWM), the signal generating unit further controls the starting of the electromagnetic heating coil, after the electromagnetic heating coil is started, the signal receiving unit receives the change of the electrical parameters in the electromagnetic heating coil and transmits the received signal to the detection and analysis module, the detection and analysis module completes the detection and analysis of the electrical parameters and further feeds the analysis result back to the control module, and the control module controls the heating device according to the analysis result of the detection value of the detection and analysis module to keep the temperature of the temperature sensing layer within a preset interval.
The electrical parameter is preferably a pulse signal, voltage, current, resistance, or the like, wherein the pulse signal is a pulse number, a pulse width, a pulse amplitude, or the like. The connection in this embodiment includes direct connection and indirect connection, for example, the control module may be directly connected to the heating device, or may be connected through a control switch or other components. The detection and analysis are the basic functions of the control unit, and other functional modules, such as a data conversion module and the like, can be added on the basis. The control unit realizes the control to the temperature through detecting the change of electrical parameter among the electromagnetism generating device, compares with traditional temperature sensor, and this patent can in time reflect temperature sensing layer temperature, has avoided the temperature detection hysteresis quality that temperature sensor brought.
Preferably, the temperature sensing layer is provided with at least one through hole, and the percentage of the total area of the through holes in the total area of the temperature sensing layer is 5% -50%.
preferentially, the electric cooker comprises a shell, a heating device arranged in the shell, a heating disc arranged above the heating device and a cooker arranged on the heating disc, wherein the panel is arranged between the heating device and the cooker, and the electromagnetic generating device is arranged below the panel.
The patent also provides a method for controlling temperature, comprising the following steps:
step 1: providing an electromagnetic heating coil and a temperature sensing layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, wherein the temperature sensing layer and the electromagnetic heating coil form a coupling impedance, the temperature sensing layer has an initial temperature change critical value and an end temperature change critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the initial temperature change critical value and the end temperature change critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
R1 and R2 are coupling impedance values of two ends of an electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic bar by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and a temperature sensing layer is 5mm, the power is 25kHz,
step 2: and setting a corresponding relation between an electrical parameter of the electromagnetic heating coil circuit and the temperature of the temperature sensing layer, wherein the electrical parameter comprises coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil, and current, voltage or pulse signals of the electromagnetic heating coil circuit.
Step 3, setting the control temperature to be T n;
And 4, step 4: the electric parameters of the electromagnetic heating coil circuit are detected and obtained, and then the electric heating device is adjusted by the control unit according to the electric parameter values or the temperature values corresponding to the electric parameter values, so that the temperature value of the cooking utensil is controlled within an expected range.
when the electrical parameter is a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, the error range of the coupling impedance is 0-5 omega, when the electrical parameter is a current value, the error range of the current value is 0-0.5A, when the electrical parameter is a voltage value, the error range of the voltage value is 0-50V, and when the electrical parameter is a pulse signal, the error range of the pulse signal is 0-3.
The induction cooker is also provided with a timing module, the timing module is started for timing when the induction heating coil starts to heat, the coupling impedance value is detected when the timing time is M 1, whether heating is needed to be continued or not is judged according to the coupling impedance value, when the judgment result is that heating is needed to be continued, the heating time is recorded as M 2, and M 1 is more than or equal to M 2.
m 1 is more than or equal to 300 seconds and less than or equal to 600 seconds, and M 2 is more than or equal to 0.1 second and less than or equal to 300 seconds.
Compared with the prior art, the invention has the beneficial effects that:
When the cooking utensil is combined with a temperature sensing layer capable of sensing the electromagnetic signals, the electric parameters in the electromagnetic generating device can be changed under the influence of the temperature sensing layer, and the control unit controls the heating power of the heating device after detecting the change of the electric parameters in the electromagnetic generating device, thereby realizing the control of the heating temperature.
The invention detects real-time electric parameter values through an electric parameter detection analysis module of the control unit by presetting expected electric parameter values in the electromagnetic generating device or expected temperature values corresponding to the electric parameter values, compares the real-time electric parameter values with the set values, and adjusts, or closes, or pauses, or starts the power of the heating unit when the detected values exceed the budget range so as to achieve the effect of adjusting the temperature of the temperature sensing layer.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a control schematic of the present invention;
FIG. 3 is a schematic structural view of example 2 of the present invention;
FIG. 4 is a schematic diagram of a first curve of variation of temperature and coupling impedance according to the present invention, wherein a is a first inflection point and b is a second inflection point;
FIG. 5 is a schematic diagram of a second variation curve of the temperature and the coupling impedance of the present invention, wherein a is a first inflection point;
FIG. 6 is a schematic diagram of a third variation curve of temperature and coupling impedance according to the present invention, wherein a is a first inflection point;
FIG. 7 is a schematic diagram of a first variation of the coupling impedance with an electrical parameter according to the present invention;
FIG. 8 is a schematic diagram of a second variation of the coupling impedance with an electrical parameter in accordance with the present invention;
FIG. 9 is a schematic diagram of a third variation of the coupling impedance and the electrical parameter of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
example 1
as shown in fig. 1-2, the present invention relates to a temperature-controllable cooking utensil, comprising a housing 3, an electromagnetic generating device 5 arranged in the housing 3, a panel 1 arranged above the electromagnetic generating device 5, a control unit 4 electrically connected with the electromagnetic generating device 5 and a heating device 2 connected with the control unit, wherein a cooker 6 is arranged above the panel 1, and at least one part of the panel 1 is a temperature-sensitive layer 11 capable of sensing an electromagnetic signal generated by the electromagnetic generating device 5. The electromagnetic generating device 5 mainly comprises an electromagnetic heating coil, a signal generating unit and a signal receiving unit, wherein the electromagnetic heating coil is respectively and electrically connected with the signal generating unit and the signal receiving unit. The electromagnetic generating device is used for generating an electromagnetic field, the size and the number of turns of the electromagnetic heating coil can be freely set according to actual needs, a signal generating unit of the electromagnetic generating device is connected with a power supply, and a signal receiving unit of the electromagnetic generating device is connected with the control unit.
The temperature sensing layer and the electromagnetic heating coil mutually influence each other under the action of an electromagnetic signal to form a coupling impedance, a certain corresponding relation exists between the coupling impedance and the temperature of the temperature sensing layer, as shown in fig. 2-6, a specific temperature curve relation is formed between the coupling impedance and the temperature of the temperature sensing layer, at least one inflection point exists in the temperature curve, usually, two inflection points preferably exist, namely, a first temperature inflection point and a second temperature inflection point respectively, the value of the first temperature inflection point is smaller than that of the second temperature inflection point, the curve before the first temperature inflection point and the curve after the second temperature inflection point both tend to be horizontal straight lines, namely, before the first temperature inflection point, the coupling impedance hardly changes or does not change obviously, and similarly, after the second temperature inflection point, the coupling impedance hardly changes or does not change obviously, but between the first temperature inflection point and the second temperature inflection point, the temperature curve shows a relatively obvious linear relationship, that is, the temperature of the temperature sensing layer changes with the difference of the coupling impedance, so that a one-to-one correspondence relationship is formed between the temperature value of the temperature sensing layer and the coupling impedance value, and the linear relationship is different due to the difference of the materials of the temperature sensing layer, for example, the temperature value of the temperature sensing layer and the coupling impedance value can be in a direct proportional relationship or an inverse proportional relationship. The temperature interval between the first temperature inflection point and the second temperature inflection point is an effective temperature interval for temperature control, and in the effective temperature interval, the corresponding temperature value of the temperature sensing layer can be obtained as long as the coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil is known. Therefore, the first temperature inflection point is also called an initial temperature change threshold, and the second temperature inflection point is also called an end temperature change threshold.
The temperature sensing layer used in this patent has the above characteristics, that is, in the curve relationship between the coupling impedance value of the temperature sensing layer and the electromagnetic heating coil and the temperature value of the temperature sensing layer in this patent, at least in a certain temperature interval, when the temperature of the temperature sensing layer changes by 1 ℃, the following relationship exists:
K＝|(R2-R1)/[R1×(T2-T1)]|
wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
the R1 and R2 are coupling resistance values of two ends of an electromagnetic heating coil which are supposed to be measured through an electric bridge under a certain condition, the patent defines that the certain condition is a supposed detection condition, namely the electromagnetic heating coil is made of a TDKPC40 magnetic rod with the diameter of 10mm and the length of 10mm by winding 300 turns of a copper wire with the diameter of 0.2mm, the distance between the electromagnetic heating coil and a temperature sensing layer is 5mm, the power is 25kHz, and the coupling resistance values of the two ends of the electromagnetic heating coil are measured under the supposed condition. The specific conditions for such detection are defined in this patent in order to provide a standard for determining the curve relationship between the coupling impedance and the temperature of the temperature-sensitive layer, and to better describe the specific properties of the temperature-sensitive layer, but this definition should not be considered as a limitation of this patent, it being easily conceivable that the coefficient K in the relationship will change when the specific conditions for detection defined in this patent are changed, but the specific temperature characteristic of the temperature-sensitive layer will not qualitatively change from definition to definition.
In general, the first inflection point can also be considered as a transition point where K is from 0.05 or less to 0.05 or more at the first occurrence in the curve, and the second inflection point can be considered as a transition point where K is from 0.05 or more to 0.05 or less.
The connection between the control unit and the heating device 2 is understood to be a direct connection and an indirect connection, i.e. the control unit can be connected either directly to the heating device 2 or via a control switch, such as a power control switch or another switch that can adjust the power of the heating device.
As a preferred embodiment, the panel 1 may be composed of the temperature sensitive layer 11 alone, i.e. the whole panel 1 is composed of the temperature sensitive layer.
as another preferred embodiment, the temperature-sensitive layer 11 constitutes only a part of the panel 1, and the temperature-sensitive layer 11 is compounded in the panel 1.
In this embodiment, the panel 1 may have a single-layer structure formed by one of an aluminum plate, a copper plate, a steel plate, or an iron plate, or may have a composite structure formed by two or more of the aluminum plate, the copper plate, the steel plate, or the iron plate, and the steel plate may be a carbon steel plate or a stainless steel plate. The pan can be placed on the panel 1 to cook food, and the food can also be directly cooked on the panel 1, for example, the pan can be directly used for cooking or cooking food on the panel 1.
the temperature sensing layer 11 has a sheet structure, and the thickness thereof is preferably 0.1 to 3 mm. Can set up at the upper surface or the lower surface of panel 1, when panel 1 is combined type structure, temperature sensing layer 11 can also set up between 1 upper surface of panel and lower surface, for example, if panel 1 is stainless steel layer, aluminium sheet layer and carbon steel layer three-layer combined type structure from top to bottom respectively, temperature sensing layer 11 can set up between stainless steel layer and aluminium sheet layer, also can set up between aluminium sheet layer and carbon steel layer.
The control unit 4 comprises a detection and analysis module and a control module, the detection and analysis module is connected with the electromagnetic generating device, specifically, the detection and analysis module is connected with a signal receiving unit of the electromagnetic generating device, the detection and analysis module is used for detecting the change of the electrical parameter in the electromagnetic generating device in real time, and the change of the electrical parameter is influenced by the temperature change of the temperature sensing layer 11 and forms a corresponding relation with the temperature of the temperature sensing layer 11. The electrical parameter may be a pulse signal, a voltage, a current or a resistance, wherein the pulse signal is preferably a pulse number, a pulse width or a pulse amplitude, etc., taking the pulse number as an example, the input end of the control module is connected with the detection and analysis module, the output end of the control module is connected with the heating device or connected with the heating device through a control switch, after the detection and analysis module detects the pulse number in the electromagnetic generation device, the detection and analysis module judges whether the pulse number is close to an initial set value through comparison, and when the pulse number is greater than or less than the set value, the control module adjusts the power of the heating device, so as to achieve the effect of adjusting the temperature; when the temperature of the temperature sensing layer approaches to the set value, the current power can be kept or fine adjustment can be carried out within a certain range, so that the temperature of the temperature sensing layer is maintained within a certain interval. In addition, the control module is also connected with a signal generating unit in the electromagnetic generating device.
The patent also provides a method for controlling temperature, comprising the following steps:
Step 1: providing an electromagnetic heating coil and a temperature sensing layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, wherein the temperature sensing layer and the electromagnetic heating coil form a coupling impedance, the temperature sensing layer has an initial temperature change critical value and an end temperature change critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the initial temperature change critical value and the end temperature change critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
k is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
the R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz.
step 2: setting a corresponding relationship between an electrical parameter of the electromagnetic heating coil circuit and a temperature of the temperature sensing layer, as shown in fig. 7-9, where the electrical parameter includes a coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil, a current, a voltage or a pulse signal of the electromagnetic heating coil circuit, and the temperature of the temperature sensing layer and the electrical parameter form a one-to-one corresponding relationship, which may be a direct proportional relationship, an inverse proportional relationship, or even a curved relationship.
Step 3, setting the control temperature to be T n;
and 4, step 4: the electric parameters of the electromagnetic heating coil circuit are detected and obtained, and then the electric heating device is adjusted by the control unit according to the electric parameter values or the temperature values corresponding to the electric parameter values, so that the temperature value of the cooking utensil is controlled within an expected range.
when the electrical parameter is a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, the error range of the coupling impedance is 0-5 omega, when the electrical parameter is a current value, the error range of the current value is 0-0.5A, when the electrical parameter is a voltage value, the error range of the voltage value is 0-50V, and when the electrical parameter is a pulse signal, the error range of the pulse signal is 0-3.
the induction cooker is also provided with a timing module, the timing module is started for timing when the induction heating coil starts to heat, the coupling impedance value is detected when the timing time is M 1, whether heating is needed to be continued or not is judged according to the coupling impedance value, when the judgment result is that heating is needed to be continued, the heating time is recorded as M 2, and M 1 is more than or equal to M 2.
M 1 is more than or equal to 300 seconds and less than or equal to 600 seconds, and M 2 is more than or equal to 0.1 second and less than or equal to 300 seconds.
The control module of the control unit can realize the adjustment of the heating device through the control switch.
The heating device is a resistance heating device, an electromagnetic heating device, a microwave heating device or a fuel gas heating device. Therefore, the technology can be applied to cooking appliances such as electric baking pans, electric rice cookers, electric pressure cookers, electromagnetic ranges, infrared ovens, halogen ovens or gas stoves.
Example 2
the embodiment is improved on the basis of the embodiment 1, as shown in fig. 3, a pan 6 is arranged on the panel of the embodiment, the pan 6 includes a pan body and a pan bottom, the embodiment changes the arrangement position of the temperature sensing layer 11, and the temperature sensing layer 11 is arranged on the pan bottom or the pan body of the pan 6 instead of the panel 1. The bottom of pan 6 can be formed by the one deck metal preparation, also can be formed by the multilayer metal complex, for example, can be in the same place by the compound such as aluminium lamination, steel layer, the layer of feeling warm can set up the upper surface in pan 6 bottom, also can set up at the lower surface, equally can set up between pan 6 bottom upper and lower surface. For the cookware capable of being heated three-dimensionally, the temperature sensing layer 11 can also be arranged at the cookware body part of the cookware.
the rest of the structure of this embodiment is the same as embodiment 1.
example 3
in this embodiment, the temperature sensing layer is improved on the basis of embodiment 1, the temperature sensing layer 11 is provided with at least one through hole, and usually a plurality of through holes are uniformly arranged, and the total area of the through holes accounts for 5% -50% of the total area of the temperature sensing layer. This arrangement can reduce the manufacturing cost of the temperature sensing layer 11 and can satisfy the efficacy of the temperature sensing layer to the maximum.
example 4
When the cooking utensil is an electric cooker, the structure of the existing electric cooker comprises a shell 3, a heating device 2 arranged in the shell 3, a heating disc and a heating pipe which are arranged on the heating device 2, wherein a cooker is arranged on the heating disc, and the heating disc is composed of a temperature sensing layer, or the temperature sensing layer is composed of a part of the heating disc and is compounded in the heating disc. An electromagnetic generating device is arranged below the temperature sensing layer, namely below the heating plate.
When the cooking appliance is an electric pressure cooker, the mounting structure of the temperature sensing layer and the heating plate is the same as that of the electric cooker, and the description is not repeated.
Example 5
The temperature sensing layer 11 of the embodiment is independent of the cooking utensil, that is, the temperature sensing layer 11 is not arranged on the cooker, nor on the cooking utensil, but is an independent component, and can be separated from the cooking utensil, and when the temperature sensing layer is needed, the temperature sensing layer can be arranged above or beside the electromagnetic generating device of the cooking utensil at any time, for example, for products such as an induction cooker or an electric baking pan, the temperature sensing layer can be arranged above a panel, for an electric cooker or an electric pressure cooker, the temperature sensing layer can be arranged above a heating plate, and after the use, the temperature sensing layer can be taken away at any time. The temperature sensing layer can be in a plate-shaped or sheet-shaped structure or a temperature sensing layer is compounded with the plate-shaped or sheet-shaped structure, and the embodiment realizes the independent processing of the temperature sensing layer and the cooking utensil.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (11)
1. A cooking utensil is characterized by comprising an electromagnetic generating device capable of generating an electromagnetic signal and a control unit which is connected with the electromagnetic generating device and can detect and analyze an electrical parameter in a circuit of the electromagnetic generating device, wherein the electromagnetic generating device comprises an electromagnetic coil, a temperature sensing layer capable of sensing the electromagnetic signal generated by the electromagnetic generating device is arranged on the side or above the electromagnetic generating device, the temperature sensing layer and an electromagnetic heating coil form coupling impedance, the temperature sensing layer has a temperature change initial critical value and a temperature change finishing critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the temperature change initial critical value and the temperature change finishing critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
K is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz.
2. The cooking utensil of claim 1, wherein a panel is further provided above or beside the electromagnetic generating device, and the panel is composed of a temperature sensing layer, or the temperature sensing layer is a part of the panel and is compounded in the panel.
3. the cooking appliance of claim 1, wherein the cooking appliance is further provided with a pot, and the temperature-sensitive layer is arranged on the pot.
4. the cooking appliance according to claim 1, wherein the cooking appliance is further provided with a heating device, the heating device is connected with the control unit, and the heating device is a resistance heating device, a gas heating device, an electromagnetic heating device or a microwave heating device.
5. the cooking appliance according to claim 4, wherein the control unit comprises a detection and analysis module and a control module, the detection and analysis module is connected with the electromagnetic generating device and is used for detecting the change of the electrical parameter in the circuit of the electromagnetic generating device, comparing the detected value with an initial set value and feeding back the analysis result to the control module;
the input end of the control module is connected with the detection and analysis module, the output end of the control module is connected with the heating device, and the control module controls the heating device according to the analysis result of the detection value by the detection and analysis module, so that the temperature of the temperature sensing layer is kept in a preset interval;
the electromagnetic generating device comprises an electromagnetic heating coil, a signal generating unit and a signal receiving unit, wherein the electromagnetic heating coil is respectively connected with the signal generating unit and the signal receiving unit, the signal generating unit is connected with the control module, and the signal receiving unit is connected with the detection and analysis module.
6. The cooking appliance of claim 5, wherein the signal generated by the signal generating unit is a pulse number, a pulse width, a pulse amplitude, a voltage, a current, or a resistance parameter.
7. The cooking appliance according to any one of claims 1 to 6, wherein the cooking appliance is an electric baking pan, an electric rice cooker, an electric pressure cooker, an electromagnetic range, an infrared oven, a halogen oven or a gas range.
8. a method of controlling temperature, comprising the steps of:
step 1: providing an electromagnetic heating coil and a temperature sensing layer capable of sensing an electromagnetic signal generated by the electromagnetic heating coil, wherein the temperature sensing layer and the electromagnetic heating coil form a coupling impedance, the temperature sensing layer has an initial temperature change critical value and an end temperature change critical value, and the temperature sensing layer has the following relation with the coupling impedance under the action of the electromagnetic signal in a temperature interval defined by the initial temperature change critical value and the end temperature change critical value:
K＝|(R2-R1)/[R1×(T2-T1)]|
Wherein, R1 represents the coupling impedance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T1;
R2 represents the coupling resistance value generated by the temperature sensing layer and the electromagnetic heating coil when the temperature of the temperature sensing layer is T2;
T2-T1＝1；
k is an absolute value of (R2-R1)/[ R1 × (T2-T1) ] and is not less than 0.05;
The R1 and R2 are coupling impedance values of two ends of the electromagnetic heating coil which are measured by an electric bridge under specific conditions, the specific conditions are defined in the patent, the electromagnetic heating coil is made by winding 300 turns of a 10 mm-diameter 10 mm-length TDK PC40 magnetic rod by a 0.2 mm-diameter copper wire, the distance between the electromagnetic heating coil and the temperature sensing layer is 5mm, and the power is 25 kHz;
step 2: setting a corresponding relation between an electrical parameter of the electromagnetic heating coil circuit and the temperature of the temperature sensing layer, wherein the electrical parameter comprises coupling impedance formed by the temperature sensing layer and the electromagnetic heating coil, and current, voltage or pulse signals of the electromagnetic heating coil circuit;
step 3, setting the control temperature to be T n;
And 4, step 4: the electric parameters of the electromagnetic heating coil circuit are detected and obtained, and then the electric heating device is adjusted by the control unit according to the electric parameter values or the temperature values corresponding to the electric parameter values, so that the temperature value of the cooking utensil is controlled within an expected range.
9. The control method according to claim 8, wherein when the electrical parameter is a coupling impedance value formed by the temperature sensing layer and the electromagnetic heating coil, an error range of the coupling impedance is 0 to 5 Ω, when the electrical parameter is a current value, an error range of the current value is 0 to 0.5A, when the electrical parameter is a voltage value, an error range of the voltage value is 0 to 50V, and when the electrical parameter is a pulse signal, an error range of the pulse signal is 0 to 3.
10. the control method of claim 9, wherein the induction cooker is further provided with a timing module, the timing module is started to time when the induction heating coil starts to heat, the coupling impedance value is detected when the timing time is M 1, whether the heating is required to be continued or not is judged according to the coupling impedance value, when the judgment result is that the heating is required to be continued, the heating time is recorded as M 2, and the M 1 is greater than or equal to M 2.
11. The control method according to claim 10, characterized in that 300 seconds ≦ M 1 ≦ 600 seconds, 0.1 seconds ≦ M 2 ≦ 300 seconds.
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Cited By (1)
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| CN114794906A (en) * | 2022-04-29 | 2022-07-29 | 广东美的厨房电器制造有限公司 | Cooking apparatus, control method and control device thereof, and storage medium |
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