CN117515612A

CN117515612A - Panel assembly and cooking apparatus

Info

Publication number: CN117515612A
Application number: CN202210906967.0A
Authority: CN
Inventors: 周瑜杰; 万鹏; 杨玲; 马志海; 曹达华; 王婷
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2024-02-06

Abstract

The invention provides a panel assembly and a cooking apparatus. The panel assembly includes: the panel is used for bearing the cooking container, the non-bearing surface of the panel comprises a first temperature measuring area and a second temperature measuring area, and the first temperature measuring area is arranged at the outer side of the second temperature measuring area; the thermistor is arranged on the first temperature measuring area and can generate a resistance signal according to the temperature change of the first temperature measuring area where the thermistor is positioned so as to reflect the temperature of the first temperature measuring area; the second temperature measuring area is used for installing a temperature detecting device, and the temperature detecting device is used for detecting the temperature of the cooking container so that the cooking equipment can adjust heating power according to the temperature detected by the temperature detecting device. According to the scheme, normal temperature measurement can be carried out on the panel through mutual cooperation between the two sets of temperature measuring devices so as to determine the temperature of the cooking container on the panel, thereby controlling heating power, detecting whether the local temperature of the panel is abnormal in real time, avoiding dry burning and other phenomena of the panel, and avoiding local damage of the panel.

Description

Panel assembly and cooking apparatus

Technical Field

The present invention relates to the field of kitchen appliances, and in particular, to a panel assembly and a cooking apparatus.

Background

The microcrystal panel applied to the induction cooker and the multi-head stove product in the small household appliance industry can have the problem that the local temperature is too high on the surface of the panel under some extreme conditions, so that the temperature difference exceeds 350 ℃, for example, when the induction cooker works, the induction cooker is unattended to cause dry heating, the bottom of the cooker is seriously deformed, and the condition that the local temperature is too high is easy to occur when the food material of the cooker is extremely easy to adhere to the cooker is cooked. However, the existing temperature detection device on the induction cooker and the multi-head stove product can only detect the temperature of the center of the panel or the center of the bottom of the cooker, and can not quickly detect other local temperature anomalies, so that a protection mechanism can not be triggered or work can not be reduced in time, the cooker, the induction cooker panel and the like are easily damaged, the induction cooker and the cooker can not be used normally, and bad experience is brought to consumers.

Therefore, the failure to provide a panel assembly capable of detecting other local temperature anomalies such as panels and cookware is a current urgent problem to be solved.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

It is, therefore, an object of the present invention to provide a panel assembly.

Another object of the present invention is to provide a cooking apparatus including the above panel assembly.

In order to achieve the above object, the present invention provides a panel assembly for a cooking apparatus. The panel assembly comprises a panel, wherein the panel is used for bearing a cooking container, a non-bearing surface of the panel comprises a first temperature measuring area and a second temperature measuring area, and the first temperature measuring area is arranged on the outer side of the second temperature measuring area; the thermistor is arranged on the first temperature measuring area and can generate a resistance signal according to the temperature change of the first temperature measuring area where the thermistor is positioned so as to reflect the temperature of the temperature sensing area; the second temperature measuring area is used for installing a temperature detecting device, and the temperature detecting device is used for detecting the temperature of the cooking container so that the cooking equipment can adjust heating power according to the temperature detected by the temperature detecting device.

The panel assembly provided by the invention specifically comprises a panel and a plurality of thermistors. For induction cookers, multi-head cookers and the like, the panel is a cooktop plate, and when in heating, containers such as cookware and the like are directly placed on the panel to be heated, so that the panel comprises a bearing surface and a non-bearing surface, generally speaking, the outer surface of the panel is the bearing surface, the inner surface is the non-bearing surface, the non-bearing surface comprises a temperature measuring area and a non-temperature measuring area, and the temperature measuring area comprises a first temperature measuring area and a second temperature measuring area. The thermistor is arranged on the first temperature measuring area, and can generate different resistance signals according to the temperature change of the corresponding area, so that whether the temperature of the corresponding area is abnormal or not can be judged according to the different resistance signals, and therefore whether the temperature of the panel is abnormal or not can be determined, namely, whether the temperature of the panel is abnormal or not is determined, so that corresponding emergency treatment can be timely carried out when the temperature of the local area of the panel is determined to be abnormal, and the panel of an induction cooker and the like is prevented from being burnt out. Meanwhile, a temperature detection device is correspondingly arranged at the second temperature measurement area to detect the temperature of the panel and the container borne on the panel. This kind of scheme has set up two sets of temperature measuring device to the temperature of panel, and wherein, temperature detecting device is used for normally detecting the temperature of panel and culinary art container to obtain the temperature of culinary art container, and can in time adjust heating power according to the temperature of culinary art container, also temperature detecting device is used for normally measuring the temperature promptly, in order to conveniently control cooking utensil's work. The thermistor is arranged on the first temperature measuring area of the panel, and is mainly used for detecting the abnormal temperature of the panel, and the thermistor is used for detecting the temperature of the panel through the change of a resistance signal, so that the abnormal temperature condition of the panel, particularly the condition of local high temperature of the panel, can be rapidly obtained. Thus, the risk of panel breakage caused by dry combustion due to the fact that the temperature of the panel is more than or equal to 350 ℃ can be avoided. Through the cooperation between two sets of temperature measuring device, can reduce the risk that the panel breaks when guaranteeing cooking vessel temperature detection precision. At the moment, the first temperature measuring area is arranged outside the second temperature measuring area, the thermistor senses more temperatures outside the panel, the temperature of the area outside the panel can be monitored, and the second temperature measuring area can monitor the temperature of the second temperature measuring area due to the existence of the temperature detection device, so that the temperature of more areas of the panel is monitored, and the accuracy of panel temperature detection is improved; and normally the second temperature measurement area is the central region that is located the panel, and the temperature of pan is higher this moment, and temperature detection device can be faster detects the temperature variation of pan, can not take place the cracked risk of panel usually, and to panel center outside region, the more easy risk that takes place the panel because local high temperature breaks this moment, therefore set up thermistor here, detect the instant temperature variation of panel, supplementary second temperature measurement area monitors the temperature variation of panel, can avoid the cracked risk of panel emergence with greater probability. In the prior art, only the temperature of the center of the panel can be detected, and the problem that the panel of the electromagnetic oven is damaged due to local overheating except the center position of the panel easily occurs.

The second temperature measuring area is positioned in the middle of the panel, and the first temperature measuring area is arranged on the outer side of the second temperature measuring area and surrounds the second temperature measuring area. The first temperature measuring area is divided into a plurality of temperature sensing areas, the thermistor comprises a plurality of temperature sensing areas, and the plurality of thermistors are arranged on the plurality of temperature sensing areas in a one-to-one correspondence mode, are arranged on the panel at intervals and are not communicated with each other. Further, the plurality of thermistors and the panel are in an integrated structure,

according to the scheme, the temperature of each area on the panel can be monitored in real time by dividing the surface of the panel into areas and arranging the thermistor layer in each area, so that when the temperature abnormality occurs, the power can be timely reduced or the heating is stopped, the use safety of the panel of the induction cooker is ensured, the use experience of a user is improved, the thermistor layer can generate abnormal signals when the temperature of any temperature sensing area of the panel is too high, the temperature of the panel can be further limited by reducing the power or stopping the heating when the abnormal signals are received, the temperature of the center of the panel can only be detected in the prior art, and the problem that the panel of the induction cooker is damaged due to local overheating except the center position of the panel is easy to occur.

Wherein the temperature detecting means is for detecting the temperature of the middle portion of the panel, thereby determining the temperature of the cooking vessel. Therefore, the specific structure of the temperature detection device can be set according to the needs, for example, the temperature detection device can be set into a common temperature controller or a thermistor and other structures.

Meanwhile, a plurality of thermistors are spaced on the panel and are independent and not communicated, namely, the thermistors in different areas are completely separated, so that whether the temperature of the corresponding area of the panel is abnormal or not can be judged by detecting the resistance value of the thermistors in each area, and if the thermistors in different areas are mutually communicated, a series resistor is formed, and the effect of measuring the temperature in different areas is lost.

Further, the resistance of the thermistor is 1 Ω or more. When the resistance value of a thermistor in a certain section is smaller than 1 Ω, the signal of the change of the resistance of the thermistor caused by the temperature change is difficult to be extracted by the processing circuit and fed back to the controller, that is, when the resistance value is too small, the sensitivity of the resistance value along with the temperature change is very low, so that the resistance value of the thermistor is generally set to be larger than or equal to 1 Ω.

Further, the resistance value of the thermistor is equal to or greater than 1 Ω and equal to or less than 500 Ω, or equal to or greater than 20 Ω and equal to or less than 200 Ω. Because the resistance of the thermistor cannot be infinitely large, the resistance of the thermistor is more suitable within 500 omega in consideration of noise and interference of electric signals when the induction cooker works due to the fact that the resistor is too large. Thus, the resistance ranges from 1 Ω to 500 Ω, and further may be from 20 Ω to 200 Ω. The resistance value is between 1 omega and 500 omega, so that the detection accuracy of the temperature change of the panel can be high, the response sensitivity of the resistance change rate of the thermistor can be improved, and the detection sensitivity of the thermistor on the panel at high temperature can be improved, so that the panel temperature can be rapidly detected when the panel temperature is abnormal, such as the panel temperature is too high.

In addition, when the resistance value of the thermistor is 20 omega-200 omega, the sensitivity of the thermistor along with temperature change can be further improved, the influence of electromagnetic induction on the thermistor is reduced, the heating phenomenon caused by the electromagnetic induction of the thermistor is reduced, and the working stability of the thermistor is influenced. And when the resistance value of the thermistor is 20 omega-200 omega, the influence on the accuracy of temperature detection of the pot by the temperature detection device in the avoidance area can be reduced, and the accuracy of temperature detection of the thermistor on the panel is improved, so that the accuracy of temperature detection of the panel and the pot by the mutual cooperation of the thermistor and the temperature detection device is improved, the accuracy of heating power adjustment is improved, in addition, the detection accuracy of the thermistor on the panel in a high-temperature state can be improved, a protection mechanism can be triggered, and the risk of cracking of the panel is reduced. Further, the cross section of the thermistor layer is perpendicular to the panel, and the thermistor is the thermistor layer, and the cross section area of the thermistor layer is more than or equal to 500 square micrometers and less than or equal to 40000 square micrometers. Further, the thermistor layer is of a strip-shaped structure, and the width of the thermistor layer on the panel is less than or equal to 2mm. Further, the thermistor on the same temperature sensing area comprises a plurality of temperature sensing sections which are connected with each other, and the distance between the adjacent temperature sensing sections of the same thermistor is larger than or equal to the width of the temperature sensing sections. Since the cross-sectional area, the width and the like of the thermistor affect the resistance value of the thermistor, the cross-sectional area and the width of the thermistor are limited to the ranges, so that the resistance value of the thermistor can be in a relatively good range, and in general, the parameter setting can ensure that the resistance value of the thermistor can be between 1 omega and 500 omega. Meanwhile, when the width of a certain thermistor exceeds 2mm, or the distance between temperature sensing sections formed by bending is smaller than the width of the thermistor, the thermistor can generate electromagnetic heating effect under the action of an electromagnetic field, and then the whole signal change is abnormal, so that the controller is difficult to make corresponding control reaction, and therefore, in the application, the width of the thermistor is set to be smaller than or equal to 2mm, and the thermistor can be effectively prevented from being heated by the electromagnetic heating.

Further, the thermistor comprises a plurality of temperature sensing sections which are connected with each other, and the plurality of temperature sensing sections are formed by bending the same thermistor.

Further, the thermistor on the same temperature sensing area comprises a plurality of temperature sensing sections which are connected with each other, and the plurality of temperature sensing sections are formed by bending the same thermistor.

In the technical scheme, each thermistor on the temperature sensing area on the panel is formed by bending the same thermistor, that is, the same temperature sensing area is formed by the same thermistor, compared with the temperature sensing area formed by a plurality of thermistors, the temperature sensing area is more convenient in detection mode, the efficiency of arranging the thermistors is higher, when one thermistor is found to have high temperature, the abnormal occurrence of the subarea can be judged, meanwhile, the shape of the thermistors in different temperature sensing areas is the same, and the appearance of the panel is more attractive. Optionally, the plurality of temperature sensing sections are mutually arranged at intervals, so that the risk that the temperature sensing sections are heated by the electromagnetic heating device is reduced, and the sensitivity of temperature change of the temperature sensing sections is improved.

Alternatively, the thermistors on different temperature sensing areas may be configured to be identical or different, which may be configured as desired. But optimally, the thermistors on different temperature sensing areas have the same shape, so that the distribution of the thermistors is more uniform, and the product is more attractive and the structure is more reasonable.

In the above technical scheme, the distance between the thermistors on any two adjacent temperature sensing areas is less than or equal to 4mm.

In the technical scheme, the distances between the thermistors on different temperature sensing areas are smaller than or equal to 4mm, detection holes are easy to occur when the distances between the thermistor arrangements are too large, namely, the positions of adjacent areas cannot be detected, so that some local areas are easy to miss, and the situation that local temperature is too high and cannot be detected easily occurs. The distance is set to be smaller than 4mm, so that the distance is moderate, not only can local area omission be avoided, but also the situation that two thermistors are too close to be conducted can be avoided, and therefore the phenomena of omission and heating by an electromagnetic heating device can be effectively avoided.

In the above technical solution, the thermistor meets one or more of the following conditions: the dimension of the thermistor in the direction perpendicular to the panel is greater than 0mm and less than or equal to 0.1mm, that is, the dimension of the thermistor in the thickness direction of the panel is less than 0.1mm. The thermistor includes a metal element, or the thermistor includes a silver film layer.

Further, the temperature sensing areas are distributed in a fan-shaped mode. The same side of a plurality of temperature sensing sections on the same area is positioned on the same straight line, the straight line is parallel to the circular fan-shaped edge, and further, the distance between the straight line and the circular fan-shaped edge is less than or equal to 2mm, so that the arrangement area of the temperature sensing sections on the area can be ensured, and the induction precision is ensured.

Further, in view of the fact that the thermistor is conductive, but for induction cookers and the like, electromagnetic heating is generally performed, and in order to avoid eddy current heat generated on the thermistor by a magnetic field generated by a coil panel of the induction cookers and the like, certain requirements are placed on the thickness, the resistance and the like of the thermistor, namely, the thermistor can be used for measuring temperature through the change of resistance through reasonable setting of parameters of the thermistor, and the situation that the thermistor is heated by the electromagnetic coil panel to cause inaccurate temperature measurement is avoided, after all, if the thermistor generates heat, the temperature is not the temperature of a panel.

The thermistor is prevented from being heated by the electromagnetic coil panel by the arrangement of the thermistor, and the thermistor is mainly prevented from forming a closed loop inside, so that the width and the thickness of the thermistor are relatively small, the thickness of the thermistor is generally smaller than 0.1mm, the width of the thermistor is smaller than or equal to 2mm, the distance between two adjacent temperature sensing sections of the same thermistor is larger than the width of the thermistor, and the cross section area is larger than or equal to 500 square micrometers and smaller than or equal to 40000 square micrometers. If the width of the temperature sensing section is too large or the interval between two adjacent temperature sensing sections is too small, the thermistor can be heated by the electromagnetic heating device; the thickness of the thermistor is smaller than 0.1mm, and too large a film thickness setting can cause too low thermistor to be detected. For the thermistor on the same temperature sensing area, the distance between the temperature sensing sections is larger than or equal to the width of the thermistor, namely the width of a gap formed by the thermistor on the same area is larger than the width of the thermistor, so that a resistor plate which is mutually communicated with each other can be prevented from being formed between different sections of the thermistor, and the thermistor is extremely easy to be heated by an electromagnetic heating device, so that inaccurate temperature measurement is caused. Therefore, the parameter of the thermistor is set so as not to be heated by the electromagnetic heating device, and the resistance value is moderate, so that the thermistor is convenient to detect as an optimal principle. Meanwhile, the distance is reasonably set, so that the fact that the thermistors which are not communicated with each other are conducted virtually due to the fact that the distance is too small is avoided.

Further, the thermistor is formed by sintering a silver target alloy, conductive silver paste, or the like.

In the technical scheme, the thermistor is formed by sintering silver target alloy or conductive silver paste and the like, the thermal conductivity of silver is relatively good, the perception of temperature change is relatively obvious, and the silver target alloy or conductive silver paste is selected as the manufacturing raw material of the thermistor, so that the temperature perception performance of the thermistor can be improved, and the thermistor has better stability due to relatively good chemical stability. Meanwhile, the price of the silver target alloy or the conductive silver paste is relatively reasonable and is easy to accept. The thermistor may be formed by sintering conductive platinum paste regardless of price. Further, the thermistor formed by sintering is easy to realize, so that the cost is low. Of course, in practice, other means of forming the thermistor may be used, such as spraying, plating, etc.

In the above technical solution, the panel assembly further includes: the decorative layer is arranged on the panel, and the thermistor is arranged between the decorative layer and the panel.

In this technical scheme, panel assembly still includes the decorative layer, and thermistor sets up between decorative layer and panel, and the intermediate clamp of decorative layer and panel has thermistor, can be further fixed thermistor, guarantees that its position can not take place to remove, improves thermistor's reliability in use. Meanwhile, the decorative layer is used for decorating and protecting the panel, so that the aesthetic property of the panel can be improved. And through holding the thermistor in the middle of decorative layer and panel, can also shield the protection to the thermistor through the decorative layer, avoid the thermistor to damage.

In another aspect, the panel assembly further comprises a decorative layer disposed on the panel, and the thermistor is disposed on a face of the decorative layer remote from the panel.

In this technical scheme, panel assembly still includes the decorative layer, and the back of panel is provided with the decorative layer, and the below of decorative layer is provided with thermistor, and this kind of setting decorative layer has better refracting effect, and the user looks more directly perceivable, has certain advantage in the outward appearance.

Further, the decorative layer comprises an ink layer, the ink is used as the decorative layer of the panel, so that the decorative layer has better stability, and the stability is stronger when heated, so that the situation of deformation of patterns can not occur.

In a further embodiment, the decorative layer covers the entire area of the face of the panel provided with the thermistor. The decoration layer covers the first temperature measuring area of the whole panel, so that the first temperature measuring area of the whole panel can be protected and decorated.

In the technical scheme, the panel comprises an avoidance area positioned in the middle of the panel, the area of the avoidance area is larger than or equal to that of the second temperature measuring area, the plurality of temperature sensing areas are uniformly distributed at intervals along the circumferential direction of the avoidance area, and each temperature sensing area is provided with a thermistor; the first end of the thermistor is positioned at the edge of the avoidance area, and the second end of the thermistor is positioned at the edge of the panel.

In this technical scheme, the middle part of whole panel has certain second temperature measurement district, and a plurality of temperature sensing district sets up along panel center circumference, and has certain interval, when manufacturing, with central point put as first end, thermistor is buckled according to certain figure from first end, and the edge of buckling to the panel heated part ends, and every subregion is the fan-shaped that center narrow edge is wide, and every region is buckled according to the same line. The method provided by the invention can detect the temperature abnormality of the central panel and the heating abnormality of the edge of the panel, and has the advantages of obvious detection effect and high reliability. And the second temperature measuring area in the middle part can effectively avoid mutual conductive communication among different thermistors. Meanwhile, a certain second temperature measuring area is arranged in the middle of the whole panel, so that a space for setting a temperature detecting device to detect the temperature can be reserved in the middle of the panel, namely, in the practical process, a cooking container is generally placed on the panel, the temperature detecting device is generally arranged in the middle of the panel to detect the temperature of the panel and the temperature of the container, and for cooking equipment, the temperature detecting device in the middle is generally used for main temperature detection, namely, the temperature of the panel and the temperature of the cooking container are detected, and a controller regulates, controls or closes the heating power according to the temperature. The thermistor on the temperature sensing area is used as auxiliary detection, so that whether the panel has local abnormal temperature points or not can be monitored, for example, whether a container or the like has dry burning or not is detected, and the risk of cracking of the panel is reduced.

The second temperature measuring area refers to that the central area of the panel is not provided with a thermistor, and the central area of the panel can be provided with a through hole or not provided with a through hole according to the requirement.

In the above technical scheme, the contacts are arranged at two ends of each thermistor, the contacts at the first ends of the plurality of thermistors are positioned on the same circumference, and the contacts at the second ends of the plurality of thermistors are positioned on the other same circumference.

In the technical scheme, the two ends of each thermistor are provided with contacts, namely, the starting point of the central part and the end point of the edge position are provided with contacts, the first end contacts of the plurality of thermistors are arranged on the same circumference, and the second end contacts of the plurality of thermistors are also arranged on the same circumference, so that each thermistor can be uniformly arranged on the panel as much as possible, and the temperature anomaly detection is facilitated. Wherein the contact is used for conducting electricity, and signals on the thermistor can be detected through the contact, such as detecting resistance change of the thermistor.

In the above technical scheme, the cooking equipment comprises an induction cooker, the panel is an induction cooker panel, and the induction cooker panel comprises a borosilicate glass panel or a microcrystalline panel.

In this technical scheme, cooking equipment can be an electromagnetism stove, and the panel is the panel of electromagnetism stove, and wherein, the panel of electromagnetism stove can be borosilicate glass panel or microcrystalline panel, and borosilicate glass panel or microcrystalline panel have better heat stability, in the electromagnetism stove heating process, can not receive temperature variation and influence the performance of panel. In particular, the borosilicate glass panel has been recently used as an induction cooker panel because it has improved strength and heat shock resistance after being tempered and is inexpensive. In the application, the problem that the local temperature of the existing induction cooker is too high under some extreme use scenes is solved in view of the fact that the temperature can be measured through the partition. That is, the technology that this application can in time discern local too high temperature to protect borosilicate glass can not break because of local dry combustion method through reducing power or stopping heating, make the borosilicate glass panel be used for the electromagnetism stove is more and more mature.

In another aspect, the cooking apparatus comprises a multi-burner, the panel being a multi-burner panel, the multi-burner panel comprising a borosilicate glass panel or a microcrystalline panel.

In this technical solution, the cooking device may also be a multi-burner, the panel being a multi-burner panel, which may be a borosilicate glass panel or a microcrystalline panel. The borosilicate glass panel or the microcrystal panel has better heat stability, and the service performance of the panel is not affected by temperature change in the heating process of the induction cooker.

In the above technical solution, the cooking apparatus comprises a pan, the panel forming a part of the pan.

In this technical scheme, cooking equipment also includes the pan simultaneously, and the panel that has thermistor is as a part of pan, just so can realize the subregion temperature measurement of pan and detect, avoid the local high temperature of pan to lead to the pan to be burnt out.

A second aspect of the present invention provides a cooking apparatus comprising the panel assembly of the second aspect. Further, the cooking apparatus further comprises a temperature detecting device and a heating device. The temperature detection device is used for being installed in the second temperature measuring area of the panel and used for detecting the temperature of the cooking container borne by the panel assembly. The heating device is connected with the temperature detection device, and can control the starting and stopping of the heating device and the heating power according to the resistance signals generated by the temperature detection device and/or the thermistor.

In the above technical solution, the cooking apparatus further includes a controller for determining that the temperature of the panel is abnormal and reducing the heating power of the heating device or stopping the heating of the heating device when the resistance signal of the abnormal change is detected.

In this technical scheme, cooking equipment still includes the controller, and the controller is used for real-time supervision temperature signal to when abnormal signal appears, confirm that the temperature of panel appears unusual, at this moment, the power of heating device can be independently adjusted to the controller, perhaps control heating device stop heating, with this temperature that reduces panel and pan, avoid the too high local dry combustion method that takes place of temperature, prevent damage pan and cooking equipment.

In the above technical solution, the controller further includes: the signal acquisition device is connected with two ends of each thermistor and is used for acquiring resistance signals generated by each thermistor; the signal processing device is connected with the signal acquisition device and is used for processing all resistance signals acquired by the signal acquisition device and transmitting the processed resistance signals; the control unit is used for receiving the induction signals processed by the signal processing device, determining whether the temperature of the panel is abnormal according to the processed resistance signals, and reducing the heating power of the heating device or stopping heating the heating device when the temperature of the panel is determined to be abnormal.

In the technical scheme, the controller further comprises a signal acquisition device, a signal processing device and a control unit. The signal acquisition device is connected with two ends of the thermistor, the signal processing device is connected with the signal acquisition device, the signal acquisition device acquires resistance signals generated by the thermistor, the signal processing device amplifies and denoises the resistance signals and sends the processed resistance signals to the control unit, and the control unit can determine the temperature of a corresponding partition after receiving the processed resistance signals, so that whether the temperature of the panel is abnormal or not can be determined. The resistance signals on the thermistor are finally converted into temperature information of different areas through the signal acquisition device, the signal processing device and the control unit, when temperature abnormality occurs, the temperature information can be directly acquired, the power of the cooking equipment is controlled, and the temperatures of the panel and the cooker are further reduced.

Further, the first temperature measuring area is divided into a plurality of temperature sensing areas, the thermistor comprises a plurality of temperature sensing areas, and the plurality of thermistors are arranged on the plurality of temperature sensing areas in a one-to-one correspondence mode. At this time, the controller may determine whether the temperature of the panel is abnormal in several ways as follows.

Scheme one: the controller is used for determining temperature abnormality of the panel when the change rate of the resistance signal in any one of the temperature sensing areas is more than or equal to 5% or more than or equal to 10% in a preset time. Scheme II: the controller is used for determining that the temperature of the panel is abnormal when the difference value of the resistance signal change rates in any two temperature sensing areas is larger than a preset threshold value.

In this technical scheme, if the local temperature of panel is because the dry combustion method such as pan on it has taken place the unusual condition, the temperature of panel can rise sharply, and the resistance signal change rate of thermistor will increase this moment, therefore in actual course, can detect the signal change rate, if find that the signal change rate is suddenly too big, can confirm that the signal corresponds the regional dry combustion method that takes place, so can confirm that the temperature of panel has taken place the unusual, can take the processing such as urgent work that falls at this moment. Of course, for different areas of the panel, the temperatures of the different areas will not differ too much basically, so that the signals generated by the different areas will not differ too much generally, so that whether there is a temperature abnormality area can be determined by comparing the change rates of the different signals, specifically, when the change rate of the resistance signal of a certain area is higher than the change rate of the signals of other areas, and when the change rate is higher than the first preset threshold, the temperature abnormality of the corresponding area can be determined, so that the abnormal temperature of the panel can be determined. The value of the first preset threshold value can be set according to the requirement, the value of the first preset threshold value is not suitable for being set too large or too small, the setting of the value of the first preset threshold value can ensure the detection precision, and meanwhile, the influence of the electromagnetic induction on the detection precision caused by the resistance signal change due to the possible heating of the thermistor is reduced as much as possible. In addition, the first preset threshold value should ensure that the value can more accurately judge that the panel is in a high-temperature state, timely detect and feed back, regulate and control the cooking power through the control unit, and reduce the risk of cracking of the panel due to local high temperature.

When the temperature change is not particularly large, the abnormal conditions such as dry burning and the like of the panel can be rapidly determined by setting the threshold value of the change rate of the resistance signal to be 5%, so that the detection precision of the panel at the time of local high temperature or local dry burning can be improved, the risk of cracking the panel is reduced, and the misjudgment when the panel at the time of local high temperature or local dry burning does not occur is reduced. Meanwhile, setting the threshold value judgment of the resistance signal change rate to 5% can also reduce the influence of the resistance signal change on the detection accuracy caused by the possible heating of the thermistor by electromagnetic induction. In addition, this kind of setting can also be in the high temperature state to the panel and carry out more accurate judgement, timely detection and feedback to regulate and control cooking power through the control unit, reduce the panel and take place the risk of breaking because of local high temperature.

Scheme III: and the controller is used for determining that the temperature of the panel is abnormal when the resistance of any one of the temperature sensing areas is more than or equal to a second preset threshold value.

In this technical scheme, the resistance signal is a resistance signal. The resistance signal reflects the resistance value, and the higher the resistance value, the higher the temperature is, so that the upper limit value of the resistance can be reasonably set according to the limit temperature of dry burning and the like, and when the monitored resistance is larger than the set upper limit value of the resistance, the panel can be considered to be abnormal such as dry burning and the like.

Scheme IV: the controller is used for determining the temperature change of each temperature sensing area according to the resistance signal of each temperature sensing area, and determining the temperature abnormality of the panel when the temperature change rate in any one temperature sensing area is detected to be larger than the temperature change rate in other temperature sensing areas.

In the technical scheme, the temperature of the corresponding area can be determined after the resistance signal of each area is monitored, and the temperature of the panel changes rapidly when the panel is in dry burning or the like, so that the panel is considered to be in dry burning or the like when the temperature change rate is monitored to be too large, and the temperature is normal if the temperature change rate is not large.

Scheme five: the controller is used for determining that the temperature of the panel is abnormal when the change rate of the resistance signal in any one temperature sensing area is larger than the change rate of the resistance signal in other temperature sensing areas. In general, when any one of the resistance signal rising rates is greater than the resistance signal rising rate in the other sensing interval, the abnormal temperature of the panel is determined.

In the technical scheme, when the change rate of the resistance signal of a certain area is detected to be larger than the change rate of the resistance signal in other temperature sensing areas, the temperature of the area is abnormal, so that the panel can be considered to be abnormal locally. In general, when the rate of rise of resistance in any one of the temperature sensing regions is greater than the rate of rise of temperature in the other resistance sensing regions, the panel temperature anomaly is determined.

In the above technical solution, the first temperature measuring area of the panel is opposite to the heating device; and/or the first temperature measuring area of the panel is projected on the panel within the projection range of the heating device on the panel, so that the dry heating condition in the heating area of the panel can be more accurately determined, the temperature abnormality can be timely detected, and the risk of cracking the panel is reduced.

In the above technical solution, the cooking apparatus may include various apparatuses, such as: electromagnetic oven, multi-head stove or electric cooker, etc.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a panel assembly provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a first structural panel assembly provided by an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a second structural panel assembly provided by an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a third structural panel assembly provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a fourth structural panel assembly provided by an embodiment of the present invention;

FIG. 6 is a cross-sectional view of a fifth structural panel assembly provided by an embodiment of the present invention;

FIG. 7 is a cross-sectional view of a sixth structural panel assembly provided by an embodiment of the present invention;

fig. 8 is a schematic structural view of a cooking apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a controller according to an embodiment of the present invention.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 9 is:

the temperature measuring device comprises a panel assembly 1, a panel 12, a first temperature measuring area 122, a non-temperature measuring area 124, a second temperature measuring area 126, a 14 thermistor, a 16 decorative layer, an 18 contact, a 2 cooking device 22, a 24 heating device, a 222 signal acquisition device, a 224 signal processing device, a 226 control unit and a 26 temperature detection device.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

A panel assembly 1 provided according to some embodiments of the present invention is described below with reference to fig. 1 to 9.

Example 1

As shown in fig. 1, 2 and 5, the technical solution of the present invention provides a panel assembly 1 for a cooking apparatus 2. The panel assembly 1 comprises a panel 12, the panel 12 is used for bearing a cooking container, the non-bearing surface of the panel 12 comprises a first temperature measuring area 122 and a second temperature measuring area 126, and the first temperature measuring area 122 is arranged outside the second temperature measuring area 126. The thermistor 14 is disposed on the temperature sensing area, and the thermistor 14 can generate a resistance signal according to the temperature change of the temperature sensing area where the thermistor 14 is located so as to reflect the temperature of the temperature sensing area. The second temperature measuring area 126 is used for installing a temperature detecting device 26, and the temperature detecting device 26 is used for detecting the temperature of the cooking container so that the cooking device 2 can adjust the heating power according to the temperature detected by the temperature detecting device 26.

The panel assembly 1 provided according to the present invention specifically includes a panel 12 and a plurality of thermistors 14. For induction cookers, multi-burner cookers, etc., the panel 12 is a cooking plate, and when heating, the containers such as cookers are directly placed on the panel 12 to be heated, so that the panel 12 comprises a bearing surface and a non-bearing surface, generally speaking, the outer surface of the panel 12 is a bearing surface, the inner surface is a non-bearing surface, and the non-bearing surface comprises a temperature measuring area and a non-temperature measuring area 124, for example, for the induction cooker, the temperature measuring area is the area within the induction range of the electromagnetic coil panel, namely, the area, drawn on the panel, capable of heating cookers. The temperature measurement region further includes a first temperature measurement region 122 and a second temperature measurement region 126. The thermistor 14 is disposed on the first temperature measuring area 122, and the thermistor 14 can generate different resistance signals according to the temperature change of the corresponding area, so as to determine whether the temperature of the corresponding area is abnormal according to the different resistance signals, so as to determine whether the temperature of the panel 12 is abnormal, that is, whether the thermistor 14 is used for determining whether the panel 12 is abnormal, so that when determining that the temperature of the local area of the panel 12 is abnormal, corresponding emergency processing is performed in time, so as to avoid burning out the panel 12 such as an induction cooker. Meanwhile, the second temperature measuring area 126 is correspondingly provided with a temperature detecting device 26 to detect the temperature of the panel 12 and the container carried on the panel 12. In this scheme, two sets of temperature measuring devices are provided for the temperature of the panel 12, wherein the temperature detecting device 26 is used for normally detecting the temperature of the panel 12 and the temperature of the cooking container, so as to obtain the temperature of the cooking container, and the heating power can be adjusted according to the temperature of the cooking container in time, namely, the temperature detecting device 26 is used for normally measuring the temperature, so that the work of the cooking utensil can be conveniently controlled. The thermistor 14 is disposed on the first temperature measuring area 122 of the panel 12, and mainly detects an abnormal temperature of the panel 12, and the thermistor 14 detects the temperature of the panel 12 through a change of a resistance signal, so that a temperature abnormal condition of the panel 12, particularly a local high temperature condition of the panel 12, can be rapidly obtained. Thus, the risk of cracking of the panel 12 due to dry combustion at a temperature of 350 ℃ or higher can be avoided. Through the cooperation between two sets of temperature measuring device, can reduce the risk that panel 12 breaks when guaranteeing cooking vessel temperature detection precision. At this time, since the first temperature measuring region 122 is disposed outside the second temperature measuring region 126, the thermistor 14 senses more temperatures outside the panel 12, so that the temperature of the area outside the panel 12 can be monitored, and the second temperature measuring region 126 can monitor the temperature of the second temperature measuring region 126 due to the temperature detecting device 26, so that the temperature of more areas of the panel 12 is monitored, and the accuracy of temperature detection of the panel 12 is improved; and usually the second temperature measuring region 126 is located in the central area of the panel 12, the temperature of the pan is higher at this time, the temperature detecting device 26 can detect the temperature change of the pan faster, the risk of cracking the panel 12 will not occur usually, and for the central outside area of the panel 12, the risk of cracking the panel 12 due to local high temperature will occur more easily at this time, so the thermistor 14 is disposed at this point to detect the instant temperature change of the panel 12, and the second temperature measuring region 126 is assisted to monitor the temperature change of the panel 12, so that the risk of cracking the panel 12 can be avoided with a higher probability. However, in the prior art, only the temperature of the center of the panel 12 can be detected, and the problem that the panel 12 is damaged due to local overheating except for the center of the panel 12 easily occurs.

As shown in fig. 1, the second temperature measuring region 126 is located in the middle of the panel 12, and the first temperature measuring region 122 is located outside the second temperature measuring region 126 and encloses the second temperature measuring region 126. The first temperature measuring area 122 is divided into a plurality of temperature sensing areas, the thermistor 14 includes a plurality of thermistors 14, the plurality of thermistors 14 are disposed on the plurality of temperature sensing areas in a one-to-one correspondence manner, and the plurality of thermistors 14 are disposed on the panel 12 at intervals and are not communicated with each other. Further, the plurality of thermistors 14 and the faceplate 12 are of unitary construction.

According to the scheme, the temperature of each area on the panel 12 can be monitored in real time by dividing the surface of the panel 12 into areas and arranging the thermistor 14 layer in each area, so that when the temperature is abnormal, the power can be timely reduced or heating is stopped, the use safety of the induction cooker panel is ensured, the use experience of a user is improved, the thermistor 14 layer can generate an abnormal signal when the temperature of any temperature sensing area of the panel 12 is too high, the temperature of the panel 12 can be further limited by reducing the power or stopping heating when the abnormal signal is received, and the problem that the induction cooker panel 12 is damaged due to local overheating except the central position of the panel 12 can be easily caused only when the temperature of the center of the panel 12 is detected in the prior art. The plurality of thermistors 14 and the panel 12 are integrally formed, i.e., the thermistor 14 is a film or a coating on the panel 12, and in general, the plurality of thermistors 14 may be formed on the panel 12 by spraying, printing, and then sintering and baking.

Wherein the temperature detecting means 26 is for detecting the temperature of the middle of the panel 12, thereby determining the temperature of the cooking vessel. Accordingly, the specific structure of the temperature detecting device 26 may be set as required, for example, a common temperature controller, or a thermistor 14.

Meanwhile, as shown in fig. 1, a plurality of thermistors 14 are spaced apart from each other on the panel 12, and are independent and not connected, that is, the thermistors 14 in different areas are completely separated, so that whether the temperature of the corresponding area of the panel 12 is abnormal can be judged by detecting the resistance value of the thermistors 14 in each area, and if the thermistors 14 in different areas are mutually connected, a series resistor is formed, and the effect of measuring the temperature in different areas is lost.

Further, the panel 12 includes a temperature measuring area, i.e. an area where temperature needs to be monitored, such as an area within the induction range of the electromagnetic coil panel for an induction cooker, i.e. an area drawn on the panel and capable of heating a pot. And other areas of the panel are non-temperature measuring areas, namely areas which do not need temperature detection.

Further, the resistance value of the thermistor 14 is 1 Ω or more. Since when the resistance value of the thermistor 14 in a certain section is smaller than 1Ω, the signal of the change in resistance of the thermistor 14 due to the temperature change is difficult to be extracted by the processing circuit and fed back to the controller, that is, when the resistance value is too small, the sensitivity of the resistance value due to the temperature change is very low, so that the resistance value of the thermistor 14 is generally set to be equal to or greater than 1Ω.

Further, the resistance value of the thermistor 14 is equal to or greater than 1 Ω and equal to or less than 500 Ω, or equal to or greater than 20 Ω and equal to or less than 200 Ω. Because the resistance of the thermistor 14 cannot be infinite, the resistance of the thermistor 14 is preferably within 500 Ω in consideration of noise and interference of an electric signal when the induction cooker is operated due to the excessively large resistance. Therefore, the range of the resistor is 1 omega-500 omega, and the resistance value is 1 omega-500 omega, so that the detection accuracy of the temperature change of the panel can be high, the response sensitivity of the resistance change rate of the thermistor can be improved, and the detection sensitivity of the thermistor to the high temperature of the panel can be improved, thereby being capable of rapidly detecting abnormal temperature of the panel, such as the case that the temperature of the panel is too high.

In addition, when the resistance value of the thermistor is 20 omega-200 omega, the sensitivity of the thermistor along with temperature change can be further improved, the influence of electromagnetic induction on the thermistor is reduced, the heating phenomenon caused by the electromagnetic induction of the thermistor is reduced, and the working stability of the thermistor is influenced. And when the resistance value of the thermistor is 20 omega-200 omega, the influence on the accuracy of the temperature detection of the pan by the temperature detection device 26 in the avoidance area can be reduced, and the accuracy of the temperature detection of the thermistor on the panel is improved, so that the accuracy of the temperature detection of the panel and the temperature detection of the pan by the mutual matching of the thermistor and the temperature detection device 26 is improved, the accuracy of the heating power adjustment is improved, and in addition, the detection accuracy of the thermistor on the panel in a high-temperature state can be improved, so that a protection mechanism can be triggered, and the risk of cracking the panel is reduced. Further, the cross-sectional area of the thermistor 14 is 500 square micrometers or more and 40000 square micrometers or less. Further, the width of the thermistor 14 is 2mm or less. Further, the thermistor 14 on the same temperature sensing area includes a plurality of temperature sensing sections connected to each other, and a distance between adjacent temperature sensing sections of the same thermistor 14 is equal to or greater than a width of the temperature sensing section. Since the cross-sectional area, the width, etc. of the thermistor 14 affect the resistance value of the thermistor 14, the present application limits the cross-sectional area, the width, etc. of the thermistor 14 to the above-described range, and can make the resistance value of the thermistor 14 in a relatively good range. Meanwhile, when the width of a certain thermistor 14 exceeds 2mm, or the distance between temperature sensing sections formed by bending is smaller than the width of the thermistor 14, under the action of an electromagnetic field, the thermistor 14 can generate an electromagnetic heating effect, and further the whole signal change is abnormal, so that a controller is difficult to make a corresponding control reaction, and therefore, in the application, the width of the thermistor 14 is set to be smaller than or equal to 2mm, and the thermistor 14 can be effectively prevented from being heated by the electromagnetic heating.

In the above embodiment, as shown in fig. 1, the thermistor 14 in each temperature sensing area on the panel 12 is formed by bending the same thermistor 14, that is, the same temperature sensing area is formed by the same thermistor 14, so that compared with the case that the temperature sensing area is formed by a plurality of thermistors 14, the detection mode is more convenient, the efficiency of arranging the thermistors 14 is higher, when one thermistor 14 is found to have high temperature, the abnormality of the area can be judged, meanwhile, the shape of the thermistors 14 in different temperature sensing areas is the same, and the appearance of the panel 12 is more attractive.

Alternatively, the thermistors 14 in different temperature sensing regions may be configured identically or differently, as may be desired. But optimally, the thermistors 14 on different temperature sensing areas have the same shape, so that the distribution of the thermistors 14 is more uniform, and the product is more attractive and the structure is more reasonable.

In the above embodiment, the pitches of the thermistors 14 on different temperature sensing areas are less than or equal to 4mm, and detection holes easily occur when the pitches of the thermistors 14 are too large, that is, positions of adjacent areas cannot be detected, so that some local areas are easily missed, and thus, the situation that local temperature is too high to be detected easily occurs. The distance is set to be smaller than 4mm, so that the distance is moderate, not only can local area omission be avoided, but also the situation that two thermistors 14 are too close to each other to conduct can be avoided, and therefore the phenomena of omission and heating by an electromagnetic heating device can be effectively avoided.

By arranging the thermistor 14, the thermistor 14 is prevented from being heated by the electromagnetic coil panel, and a closed loop is mainly prevented from being formed inside the thermistor 14, so that the width and the thickness of the thermistor 14 are relatively small, the thickness (along the vertical direction of the panel 12) of the thermistor 14 is generally smaller than 0.1mm, the width of the thermistor 14 is smaller than or equal to 2mm, the distance between two adjacent temperature sensing sections of the same thermistor 14 is larger than the width of the thermistor 14, and the cross section area is larger than or equal to 500 square micrometers and smaller than or equal to 40000 square micrometers. If the width of the temperature sensing section is too large or the interval between two adjacent temperature sensing sections is too small, the thermistor 14 is heated by the electromagnetic heating device. The thickness of the thermistor 14 is less than 0.1mm, and an excessively large film thickness may cause the resistance of the thermistor 14 to be too low to be detected. For the thermistor 14 on the same temperature sensing area, the distance between the temperature sensing sections should be equal to or greater than the width of the thermistor 14, that is, the width of the gap formed by the thermistor 14 on the same area is greater than the width of the thermistor 14, so that a resistor plate which is mutually communicated with each other can be avoided from being formed between different sections of the thermistor 14, and thus the thermistor 14 is very easy to be heated by the electromagnetic heating device, and inaccurate temperature measurement is caused. Therefore, the parameter of the thermistor 14 is set so as not to be heated by the electromagnetic heating device, and the resistance value is moderate, so that the detection is convenient as the optimal principle. At the same time, the distance is reasonably set, so that the thermistor 14 which is not communicated is prevented from being substantially conducted due to the fact that the distance is too small.

Further, the distance between the adjacent temperature sensing sections of the same thermistor 14 is smaller than 4mm, so that the arrangement density of the temperature sensing sections can be improved, and the temperature sensing accuracy of the thermistor 14 can be improved.

Further, as shown in fig. 1, the temperature sensing areas are distributed in a fan shape. The same side of a plurality of temperature sensing sections on the same area is positioned on the same straight line, the straight line is parallel to the circular fan-shaped edge, and further, the distance between the straight line and the circular fan-shaped edge is less than or equal to 2mm, so that the arrangement area of the temperature sensing sections on the area can be ensured, and the induction precision is ensured.

Further, the thermistor 14 is formed by sintering a silver target alloy, conductive silver paste, or the like.

In the above embodiment, as shown in fig. 1, the thermistor 14 is formed by sintering a silver target alloy or conductive silver paste. The thermal conductivity of silver is better, the perception of temperature change is more obvious, and the selection of silver target alloy or conductive silver paste as the manufacturing raw material of the thermistor 14 can improve the temperature perception performance of the thermistor 14, and the thermal resistor has better stability due to better chemical stability. Meanwhile, the price of the silver target alloy or the conductive silver paste is relatively reasonable and is easy to accept. The thermistor 14 may be formed by sintering conductive platinum paste regardless of price. Further, the thermistor 14 formed by sintering is easy to realize in terms of its process and thus is low in cost. Of course, in practice, other means of forming the thermistor 14 may be used, such as spraying, plating, etc.

In the above embodiment, as shown in fig. 3, 4, 6 and 7, the panel assembly 1 further includes a decoration layer 16, the thermistor 14 is disposed between the decoration layer 16 and the panel 12, and the thermistor 14 is sandwiched between the decoration layer 16 and the panel 12, so that the thermistor 14 can be further fixed, the position of the thermistor 14 is ensured not to be moved, and the reliability of use of the thermistor 14 is improved. At the same time, the decorative layer 16 is used to decorate and protect the panel 12, which may enhance the aesthetics of the panel 12. By sandwiching the thermistor 14 between the decorative layer 16 and the panel 12, the thermistor 14 can be shielded and protected by the decorative layer 16, and damage to the thermistor 14 can be avoided.

In another embodiment, as shown in fig. 4, the panel assembly 1 further includes a decorative layer 16, the decorative layer 16 is disposed on the back (vertically downward direction) of the panel 12, the thermistor 14 is disposed under the decorative layer 16, and the decorative layer 16 has better refraction effect, and the user looks more visual, and has a certain advantage in appearance.

Further, as shown in fig. 6 and 7, the decorative layer 16 includes an ink layer, and the decorative layer 16 using the ink as the panel 12 has better stability, is more stable when heated, and does not deform the pattern.

In another embodiment, as shown in FIG. 4, the decorative layer 16 covers the entire area of the face of the panel 12 where the thermistor 14 is disposed. I.e. the finishing layer 16 is covering the first temperature measuring area of the entire panel 12, whereby the first temperature measuring area of the entire panel 12 can be protected and decorated.

In the above embodiment, the panel 12 includes the second temperature measuring region 126 located in the middle of the panel 12, the area of the second temperature measuring region 126 is smaller than that of the first temperature measuring region 122, the plurality of temperature sensing regions are uniformly spaced along the circumference of the second temperature measuring region 126, and each temperature sensing region is provided with the thermistor 14; the first end of the thermistor 14 is located at the edge of the avoidance area, and the second end of the thermistor 14 is located at the edge of the first temperature measurement area, so that the thermistor 14 can be distributed on the first temperature measurement area of the whole panel from the center outwards.

In this embodiment, as shown in fig. 1, the middle part of the entire panel 12 has a certain second temperature measuring area 126, a plurality of temperature sensing areas are circumferentially arranged along the center of the panel 12, and have certain intervals, and when the panel is manufactured, the thermistor 14 is bent from the first end according to a certain pattern with the center position as the first end, and is bent to the end of the edge (second end) of the heated portion of the panel 12, each area is a sector with a narrow center and wide edge, and each area is bent according to the same texture. The method provided by the invention can detect not only the temperature abnormality of the central panel 12, but also the heating abnormality of the edge of the panel 12, and has the advantages of obvious detection effect and high reliability. And the second temperature measuring area in the middle can effectively avoid mutual conductive communication between different thermistors 14.

Meanwhile, the second temperature measuring area 126 is disposed in the middle of the whole panel 12, so that a space for setting the temperature detecting device 26 to detect the temperature is reserved in the middle of the panel 12, that is, in the practical process, a cooking container is generally placed on the panel 12, the temperature detecting device 26 is generally disposed in the middle of the panel 12 to detect the temperature of the panel 12 and the container, and for cooking equipment, the temperature detecting device in the middle is generally used for main temperature detection, that is, the temperature of the panel 12 and the temperature of the cooking container are detected, and the controller regulates or closes the heating power according to the temperature. The thermistor 14 in the temperature sensing area is used as an auxiliary detection to monitor whether a local abnormal point of the temperature occurs on the panel 12, for example, whether a container is dry burned or not, so as to reduce the risk of cracking the panel 12.

The second temperature measuring region 126 herein refers to a region where the thermistor 14 is not disposed in the central region of the panel 12, and the central region of the panel 12 may be disposed with or without a through hole as required.

In the above embodiment, as shown in fig. 1, the contacts 18 are provided at both ends of each thermistor 14, the contacts 18 at the first ends of the plurality of thermistors 14 are located on the same circumference, and the contacts 18 at the second ends of the plurality of thermistors 14 are located on another same circumference.

In this embodiment, each thermistor 14 has contacts 18 at both ends, i.e., the start point and the end point of the central portion have contacts 18, and the plurality of thermistors 14 have first end contacts 18 on the same circumference and second end contacts 18 on the same circumference, so that the arrangement can be made as uniform as possible for each thermistor 14 on the panel 12 for facilitating temperature abnormality detection. Wherein the contact 18 is for conducting electricity, a signal on the thermistor 14 can be detected by the contact 18, such as detecting a change in resistance of the thermistor 14.

In the above embodiment, the cooking appliance is an induction cooker, a range, or the like, and in this case, a cooking container is generally placed above the panel to heat the food. The thermistor 14 is not disposed in the middle of the panel, that is, the middle of the panel is surrounded by the thermistor 14 to form a mounting hole, the mounting hole is used for placing the temperature detecting device 26, and the temperature detecting device 26 is mainly suitable for detecting the temperature of the panel and the cookware, and can control the heating power of the cooking equipment according to the detected temperature, that is, can control the closing of the heating device and reasonably control the power of the heating device. The middle portion of the panel may be solid to the avoidance area, and the temperature detecting device 26 detects the temperature of the cooking container through the panel. Of course, a through hole may be formed in the middle of the panel for the temperature detecting device 26 to extend out, so that the temperature detecting device 26 can be conveniently and directly contacted with the cooking container for measuring temperature.

In the above embodiment, for the induction cooker, the multi-head range, and the like, the panel is a kitchen table, and the container such as the pot is directly placed on the panel to be heated during heating, so that the panel includes a bearing surface and a non-bearing surface, generally, the outer surface of the panel is a bearing surface, the inner surface is a non-bearing surface, and the temperature sensing area is disposed on the non-bearing surface, that is, the thermistor 14 is disposed on the non-bearing surface to detect the temperature of the panel. In the above embodiment, as shown in fig. 1, the cooking apparatus 2 comprises an induction cooker, the panel 12 being an induction cooker panel, the induction cooker panel comprising a borosilicate glass panel or a microcrystalline panel.

In this embodiment, the cooking apparatus 2 may be an induction cooker, and the panel 12 is the panel 12 of the induction cooker, where the panel 12 of the induction cooker may be a borosilicate glass panel or a microcrystalline panel, and the borosilicate glass panel or the microcrystalline panel has good thermal stability, and is not affected by temperature change during heating of the induction cooker. In particular, the borosilicate glass panel has been recently used as an induction cooker panel because it has improved strength and heat shock resistance after being tempered and is inexpensive. In the application, the problem that the local temperature of the existing induction cooker is too high under some extreme use scenes is solved in view of the fact that the temperature can be measured through the partition. That is, the technology that this application can in time discern local too high temperature to protect borosilicate glass can not break because of local dry combustion method through reducing power or stopping heating, make the borosilicate glass panel be used for the electromagnetism stove is more and more mature.

In another embodiment, the cooking apparatus 2 comprises a multi-burner panel 12, the panel 12 being a multi-burner panel 12, the multi-burner panel 12 comprising a borosilicate glass panel or a microcrystalline panel.

In this embodiment, the cooking device 2 may also be a multi-burner, the panel 12 being a multi-burner panel 12, the multi-burner panel 12 being a borosilicate glass panel or a microcrystalline panel. Borosilicate glass panels or microcrystalline panels have good thermal stability and do not suffer from temperature variations during the induction cooker heating process, which would affect the performance of panel 12.

In the above described embodiment, the cooking apparatus 2 comprises a pan, the panel 12 forming part of the pan.

In this embodiment, the cooking apparatus 2 also includes a pot, and the panel 12 with the thermistor 14 is used as a part of the pot, so that the temperature measurement of the pot can be performed in a partitioned manner, and the pot is prevented from being burnt out due to the excessive local temperature of the pot.

A second aspect of the present invention provides a cooking apparatus comprising the panel assembly of the second aspect. Further, the cooking apparatus further comprises a temperature detecting device 26 and a heating device, wherein the temperature detecting device 26 is configured to be mounted on the second temperature measuring area 126 of the panel 12, and is configured to detect the temperature of the cooking container carried by the panel 12. The heating device is connected to the temperature detection device 26, and can control the start and stop of the heating device and the heating power according to the resistance signal generated by the temperature detection device 26 and/or the thermistor 14.

According to the cooking apparatus provided by the present invention, since the panel assembly in the first aspect is used, the cooking apparatus provided by the present invention has all the advantages of any embodiment in the first aspect, and will not be described herein. The temperature detection device is used for normally measuring temperature so as to well control the heating power, thereby controlling the food heating process of the cooking container.

In the above embodiment, as shown in fig. 8, the cooking apparatus 2 further includes a controller 22, and the controller 22 is configured to determine that the temperature of the panel is abnormal and reduce the heating power of the heating device 24 or stop heating the heating device 24 when the resistance signal of the variation abnormality is detected.

In this embodiment, the cooking apparatus 2 further comprises a controller 22, the controller 22 being adapted to monitor the temperature signal in real time. And when an abnormal signal appears, the temperature of the panel 12 is determined to be abnormal, at this time, the controller 22 can automatically adjust the power of the heating device or control the heating device to stop heating, so that the temperature of the panel 12 and the cookware is reduced, local dry burning caused by overhigh temperature is avoided, and the cookware and cooking equipment are prevented from being damaged.

In the above embodiment, as shown in fig. 9, the controller 22 further includes: the signal acquisition device 222, the signal processing device 224 and the control unit 226, wherein the signal acquisition device 222 is connected with two ends of each thermistor 14 and is used for acquiring resistance signals generated by all the thermistors 14; the signal processing device 224 is connected with the signal acquisition device 222 and is used for processing all resistance signals and sending the processed resistance signals; the control unit 226 is configured to receive the sensing signal processed by the signal processing device 224, determine that the temperature of the panel 12 is abnormal according to the processed resistance signal, and reduce the heating power of the heating device or stop heating the heating device when the temperature of the panel 12 is determined to be abnormal.

In this embodiment, the controller 22 further comprises a signal acquisition device 222, a signal processing device 224 and a control unit 226. The signal collecting device 222 is connected to two ends of all the thermistors 14, the signal processing device 224 is connected to the signal collecting device 222, the signal collecting device 222 collects resistance signals generated by the thermistors 14, the signal processing device 224 amplifies and denoises the resistance signals, and sends the processed resistance signals to the control unit 226, and the control unit 226 can determine whether the temperature of the panel is abnormal after receiving the processed resistance signals, so that follow-up measures can be timely taken, for example, power of the cooking device 2 and the like is controlled, so that the temperature of the panel 12 and the cookware is reduced, and burning of the panel 12 and the like is avoided.

In the above embodiment, the controller 22 is configured to determine that the temperature of the panel 12 is abnormal when the rate of change of the resistance signal in any one of the temperature sensing areas is monitored to be 5% or more or 10% or more for a predetermined time, or the controller 22 is configured to determine that the temperature of the panel 12 is abnormal when the difference between the rates of change of the resistance signals in any two of the temperature sensing areas is monitored to be greater than a predetermined threshold.

In this embodiment, if the local temperature of the panel 12 is abnormal due to dry heating of a pot or the like thereon, the temperature of the panel 12 is rapidly increased, and at this time, the rate of change of the resistance signal of the thermistor is increased, so that in the actual process, the rate of change of the signal can be detected, and if the rate of change of the signal is found to be suddenly excessive, it can be determined that the area corresponding to the signal is dry-heated, so that it can be determined that the temperature of the panel 12 is abnormal, and at this time, an emergency power reduction or the like can be performed. Of course, the temperatures of the different areas of the panel 12 will not differ too much, so the signals generated by the different areas will not differ too much, so it can be determined whether there is a temperature anomaly area by comparing the change rates of the different signals, specifically, when the change rate of the resistance signal of one area is higher than the change rate of the resistance signal of the other area, and when the change rate is higher than the first preset threshold, it can be determined that the temperature of the corresponding area is abnormal, so that it can be determined that the temperature of the panel 12 is abnormal. The value of the first preset threshold value can be set according to the requirement, the value of the first preset threshold value is not suitable for being set too large or too small, the setting of the value of the first preset threshold value can ensure the detection precision, and meanwhile, the influence of the electromagnetic induction on the detection precision caused by the resistance signal change due to the possible heating of the thermistor is reduced as much as possible. In addition, the first preset threshold should ensure that the value can more accurately judge that the panel 12 is in a high temperature state, timely detect and feed back, regulate and control the cooking power through the control unit, and reduce the risk of cracking of the panel 12 due to local high temperature.

When the temperature change is not particularly large by setting the threshold value of the resistance signal change rate to 5%, it is possible to quickly determine that the panel 12 is abnormal, such as for dry combustion, so that the detection accuracy for the panel 12 at a local high temperature or local dry combustion can be improved, the risk of cracking the panel 12 can be reduced, and erroneous determination when the panel 12 at a local high temperature or local dry combustion does not occur can be reduced. Meanwhile, setting the threshold value judgment of the resistance signal change rate to 5% can also reduce the influence of the resistance signal change on the detection accuracy caused by the possible heating of the thermistor by electromagnetic induction. In addition, this kind of setting can also be in the high temperature state to panel 12 and carry out more accurate judgement, timely detection and feedback to regulate and control cooking power through the control unit, reduce panel 12 and take place the risk of breaking because of local high temperature.

In the above technical solution, the first temperature measuring area of the panel is opposite to the heating device; and/or

The first temperature measuring area of the panel is in the projection range of the heating device on the panel, so that the dry heating condition in the heating area of the panel can be accurately determined, the temperature abnormality can be timely detected, and the risk of cracking of the panel is reduced.

In the above-described embodiment, the cooking apparatus 2 may include various apparatuses such as: electromagnetic oven, multi-head stove or electric cooker, etc.

Example two

As shown in fig. 1, this embodiment provides a panel assembly for an induction cooker, the panel assembly comprising a borosilicate glass panel. Meanwhile, a plurality of bent thermistors 14 are prepared in the induction area of a coil panel of a high borosilicate glass panel (specifically, the panel 12 in fig. 1) for the induction cooker in a screen printing mode, a water transfer printing mode and the like, two ends of each thermistor 14 are connected with a host, when the high borosilicate glass panel is used as a panel of an induction cooker product, the temperature of the panel rises to cause the resistance value of a resistance wire to change, the host scans the signal change condition of the resistance wire in each area in a contact mode, extracts and feeds back the signal change condition of the resistance wire to a chip through a signal processing circuit, and the chips are compared one by one (before and among dry burning) to judge whether local dry burning exists or not.

The materials of the thermistors 14 are not limited, the wires are in complementary communication, the occupied areas in the sensing areas can be the same or different, but the resistance of each thermistor 14 is required to be more than or equal to 1 omega. When the resistance value of the silk thread of a certain section is less than 1 omega, the signal of the resistance layer of the section, which changes along with the temperature change, is difficult to extract and feed back to the chip through the processing circuit, and then the corresponding control reaction is made. In addition, the resistance of the thermistor 14 layer cannot be infinitely large, and the resistance is relatively suitable within 500 Ω in consideration of noise and interference of electric signals when the induction cooker works due to the fact that the resistance is too large. Thus, the resistance ranges from 1 to 500 Ω, and further may be from 20 Ω to 200 Ω.

When the conductivity of the resistance paste is fixed, the resistance value of the resistance layer to be debugged is usually adjusted by adjusting the cross-sectional area of the resistance layer. In this embodiment, in order to obtain a resistance value in the range of 1 to 500 Ω, the size of the cross-sectional area of the resistive layer should be in the range of 500 to 40000 square micrometers. In addition, the width of the thermistor 14 is less than 2mm, and the pitch of the thermistor 14 formed by bending is not smaller than the width of the resistor layer. When the width of a certain thermistor 14 exceeds 2mm, or the distance formed by bending is smaller than the width of the resistor layer, the resistor layer can generate electromagnetic heating effect under the action of an electromagnetic field, so that the whole signal change is abnormal, and the chip is difficult to make corresponding control reaction.

Among other things, the parameters of the thermistor 14 have a very large impact on the performance of the panel, and the panel assembly of the present application is further described below in connection with several specific examples.

Specific example 1: the bottom of the electromagnetic oven high borosilicate glass panel (specifically, the panel 12 in fig. 1) is provided with 8 bent thermistor change wires (specifically, the thermistor 14 in fig. 1) which are uniformly distributed in a magnetic induction area, the width of the thermistor is 1mm, the distance between the wires formed by bending is 5mm, the thermistor is a silver target alloy, each section of resistance is 30 omega, when the electromagnetic oven high borosilicate glass panel is normally used, the resistance of a resistance layer is changed along with the rise of temperature, the relative change rate of the resistance layer is 3 percent, and at the moment, the electromagnetic oven normally operates. When the heating area of the induction cooker is subjected to local dry heating, the resistance of the thermistor at the dry heating area is suddenly changed, the relative change rate of the resistance exceeds the range of the thermistor at other areas by 10%, and the host successfully judges that the heating area is subjected to the dry heating, so that the power of the induction cooker is reduced or the heating is stopped, the accurate temperature control is realized, and the high-boron silicon panel cannot be broken.

Specific example 2: as shown in fig. 1, 8 bent thermistor change wires (specifically, the thermistor 14 in fig. 1) are uniformly distributed in a magnetic induction area at the bottom of an electromagnetic oven high borosilicate glass panel (specifically, the panel 12 in fig. 1), wherein the width of 7 sections of thermistors is 1mm, the width of one section of the thermistor is 2.5mm, the distance between the bent wires is 5mm, the thermistors are silver target alloy, and each section of the thermistor has a resistance value of 30Ω. When the electromagnetic induction cooker is normally used, the thermistor with the width of 2.5mm generates heat under the action of an electromagnetic field, so that the resistance change is abnormal, and the main machine judges that dry combustion occurs in the area, and the whole electromagnetic induction cooker is powered down or stops heating, so that the electromagnetic induction cooker is basically unusable.

Specific example 3: as shown in fig. 1, 8 bent thermistor change wires (specifically, the thermistor 14 in fig. 1) are uniformly distributed in a magnetic induction area at the bottom of an electromagnetic oven high borosilicate glass panel (specifically, the panel 12 in fig. 1), the width of each section of thermistor is 1mm, the wire spacing formed by bending 7 sections of thermistor is 5mm, the wire spacing formed by the whole section of thermistor wire is 0.8mm, the thermistor is a silver target alloy, and each section of thermistor has a resistance value of 30Ω. When the electromagnetic induction cooker is normally used, the thermistor with the wire spacing of 0.8mm generates heat under the action of an electromagnetic field, so that the resistance change is abnormal, and the main machine judges that dry combustion occurs in the area, and the whole electromagnetic induction cooker is powered down or stops heating, so that the electromagnetic induction cooker is basically unusable.

Specific example 4: as shown in FIG. 1, 8 bent thermistor change wires (specifically, the thermistor 14 in FIG. 1) are uniformly distributed in a magnetic induction area at the bottom of a high borosilicate glass panel (specifically, the panel 12 in FIG. 1) of the induction cooker, the width of the thermistor is 1mm, the distance between the bent wires is 5mm, the thermistor is conductive silver paste, the resistance of each section is 0.5 omega, and when the induction cooker is normally used, the resistance of a resistance layer is changed along with the rise of temperature, the relative change rate is 2 percent, and at the moment, the induction cooker is normally operated. When the heating area of the induction cooker is locally dry-burned, the resistance of the thermistor at the dry-burned area is suddenly changed, but the signal change caused by the change is not strong enough and is not captured, so that the host cannot successfully judge that the dry-burned area is dry-burned, and the control is not performed, so that the dry-burned area always exists, and the high-boron silicon panel is broken.

In the description of the present specification, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A panel assembly for a cooking apparatus, comprising:

the panel is used for bearing the cooking container, the non-bearing surface of the panel comprises a first temperature measuring area and a second temperature measuring area, and the first temperature measuring area is arranged on the outer side of the second temperature measuring area;

The thermistor is arranged on the first temperature measuring area and can generate a resistance signal according to the temperature change of the first temperature measuring area where the thermistor is positioned so as to reflect the temperature of the first temperature measuring area; the second temperature measuring area is used for installing a temperature detection device, and the temperature detection device is used for detecting the temperature of the cooking container so that the cooking equipment can adjust heating power according to the temperature detected by the temperature detection device.

2. The panel assembly of claim 1, wherein the panel assembly comprises,

the first temperature measuring area is divided into a plurality of temperature sensing areas, the thermistor comprises a plurality of thermistors, the thermistors are arranged on the temperature sensing areas in a one-to-one correspondence mode, and the thermistors are arranged on the panel at intervals and are not communicated with each other.

3. The panel assembly of claim 1, wherein the panel assembly comprises,

the resistance value of the thermistor is larger than or equal to 1 omega.

4. The panel assembly of claim 3, wherein the panel assembly comprises,

the resistance value of the thermistor is larger than or equal to 1 omega and smaller than or equal to 500 omega, or larger than or equal to 20 omega and smaller than or equal to 200 omega.

5. The panel assembly of claim 1, wherein the panel assembly comprises,

The thermistor is a thermistor layer, the cross section area of the thermistor layer is more than or equal to 500 square micrometers and less than or equal to 40000 square micrometers, and the cross section of the thermistor layer is perpendicular to the panel; and/or

The thermistor is a thermistor layer, the thermistor layer is of a strip-shaped structure, and the width of the thermistor on the panel is less than or equal to 2mm.

6. The panel assembly of claim 1, wherein the panel assembly comprises,

the thermistor comprises a plurality of temperature sensing sections which are connected with each other, and the distance between the adjacent temperature sensing sections of the thermistor is larger than or equal to the width of the temperature sensing sections.

7. The panel assembly of claim 2, wherein the panel assembly comprises,

the thermistors on the same temperature sensing area comprise a plurality of temperature sensing sections which are connected with each other, and the distance between the adjacent temperature sensing sections of the same thermistor is larger than or equal to the width of the temperature sensing sections.

8. The panel assembly of claim 1, further comprising:

the decoration layer is arranged on the panel, and the thermistor is arranged between the decoration layer and the panel, or is arranged on the surface of the decoration layer away from the panel.

9. The panel assembly of claim 8, wherein the panel assembly comprises,

the decorative layer comprises an ink layer; and/or

The decorative layer covers the whole first temperature measuring area of the panel.

10. The panel assembly according to any one of claims 2 to 9, wherein,

the panel comprises an avoidance area positioned in the middle of the panel, the area of the avoidance area is larger than or equal to that of the second temperature measuring area, a plurality of temperature sensing areas are uniformly distributed at intervals along the circumferential direction of the avoidance area, and each temperature sensing area is provided with a thermistor;

the first end of the thermistor is located at the edge of the avoidance area, and the second end of the thermistor is located at the edge of the first temperature measuring area.

11. The panel assembly of claim 2, wherein the panel assembly comprises,

the two ends of each thermistor are provided with contacts, the contacts of the first ends of the thermistors are positioned on the same circumference, and the contacts of the second ends of the thermistors are positioned on the other same circumference.

12. The panel assembly of any one of claims 1 to 11, wherein,

the cooking equipment comprises an induction cooker, wherein the panel is an induction cooker panel, and the induction cooker panel comprises a borosilicate glass panel or a microcrystal panel; or (b)

The cooking apparatus comprises a container, the panel forming part of the container.

13. A cooking apparatus, comprising:

the panel assembly of any one of claims 1 to 11;

the temperature detection device is used for being arranged in the second temperature measuring area of the panel and detecting the temperature of the cooking container borne by the panel assembly;

and the heating device can control the starting and stopping of the heating device and the heating power according to the resistance signals generated by the temperature detection device and/or the thermistor.

14. The cooking apparatus of claim 13, further comprising:

and the controller is used for determining that the temperature of the panel is abnormal when the change of the resistance signal is abnormal, and reducing the heating power of the heating device or stopping heating the heating device.

15. The cooking apparatus of claim 14, wherein the controller comprises:

the signal acquisition device is connected with two ends of each thermistor and is used for acquiring resistance signals generated by each thermistor;

the signal processing device is connected with the signal acquisition device and is used for processing all resistance signals acquired by the signal acquisition device and transmitting the processed resistance signals;

And the control unit is used for receiving the induction signal processed by the signal processing device, determining whether the temperature of the panel is abnormal according to the processed resistance signal, and reducing the heating power of the heating device or stopping heating the heating device when the temperature of the panel is determined to be abnormal.

16. The cooking apparatus according to claim 14 or 15, wherein the first temperature measuring region is divided into a plurality of temperature sensing regions, the thermistor includes a plurality, and a plurality of the thermistors are disposed on the plurality of temperature sensing regions in one-to-one correspondence;

the controller is used for determining that the temperature of the panel is abnormal or when the change rate of the resistance signal in any one of the temperature sensing areas is monitored to be more than 5% in the preset time

The controller is used for determining that the temperature of the panel is abnormal when the difference value of the resistance signal change rates in any two temperature sensing areas is larger than a first preset threshold value; or (b)

The controller is used for determining that the temperature of the panel is abnormal when the resistance of any temperature sensing area is monitored to be more than or equal to a second preset threshold value; or (b)

The controller is used for determining the temperature change of each temperature sensing area according to the resistance signal of each temperature sensing area, and determining the temperature abnormality of the panel when the temperature change rate in any one temperature sensing area is monitored to be larger than the temperature change rate in other temperature sensing areas; or (b)

The controller is used for determining that the temperature of the panel is abnormal when the change rate of the resistance signal in any one of the temperature sensing areas is larger than the change rate of the resistance signal in other temperature sensing areas.

17. Cooking apparatus according to claim 14 or 15, characterized in that,

the first temperature measuring area is arranged opposite to the heating device; and/or

The projection of the first temperature measuring area on the panel is in the projection range of the heating device on the panel.

18. Cooking apparatus according to any of the claims 13-17, characterized in that,

the cooking equipment comprises an electromagnetic oven, a multi-head stove or an electric cooker.