阅读说明：本技术 一种烹饪器具及控制温度的方法 (cooking appliance and temperature control method ) 是由 廖哲 于 2019-08-27 设计创作，主要内容包括：本发明涉及一种烹饪器具,包括壳体,烹饪器具还包括能够产生电磁信号的电磁产生装置,与电磁产生装置连接并能够检测分析电磁产生装置中电参数的控制单元,具有温度特性改变点的感温层、以及变温层。本发明通过控制单元、电磁产生装置、感温层、变温层的设置可以方便实现对烹饪器具温度大小的控制。(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.)

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.

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.