An electromagnetic oven

Abstract

The utility model relates to the technical field of electromagnetic oven discloses an electromagnetic oven, including panel, support subassembly and place the temperature measuring element and heating assembly below the panel, support subassembly is located on the panel and is used for supporting the cookware to form the gap between the cookware bottom and the panel, and support subassembly includes the heat conducting part, and the heat conducting part constitutes the heat conduction area on the panel, and the temperature measuring element sets up in the panel bottom and is placed in the heat conduction area. The above-mentioned electromagnetic oven has the advantages that the temperature measuring response speed is fast and the heating efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of induction cooker technology, and in particular to an induction cooker. Background Technology

[0002] When heating cookware, the bottom of the cookware needs to make large-area contact with the control panel, and temperature measurement relies on an NTC temperature sensor. Since cookware is frequently placed or removed, the bottom directly impacts the control panel during this process. Therefore, the NTC temperature sensor is usually installed under the control panel to prevent damage from impacts.

[0003] However, this design has a significant problem: the NTC temperature sensor is separated from the cookware by the panel. When heat is transferred from the cookware to the panel and then to the sensor, a significant delay occurs, resulting in a slow NTC temperature response. This not only causes the cookware to overheat but also forces the panel to withstand a large amount of heat. To meet the requirements for high temperature resistance and structural stability, the panel needs to be designed to be quite thick, typically greater than 4mm, which reduces the efficiency of induction heating and causes the entire unit to overheat. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an induction cooker with fast temperature response and high heating efficiency.

[0005] The specific technical solution of this utility model is as follows: an induction cooker includes a panel, a support assembly, a temperature measuring element and a heating assembly placed below the panel. The support assembly is disposed on the panel and is used to support the cookware so that a gap is formed between the bottom of the cookware and the panel. The support assembly includes a heat-conducting element, which forms a heat-conducting area on the panel. The temperature measuring element is disposed at the bottom of the panel and placed in the heat-conducting area.

[0006] In the aforementioned induction cooker, a gap is created between the bottom of the cookware and the panel through a support component. The heat from the cookware can dissipate through this gap, significantly reducing the total heat transferred to the panel. This lowers the requirements for the panel's temperature resistance, allowing for a reduction in panel thickness, eliminating the need to maintain the original thickness of over 4mm. It also lowers the operating temperature of the components below the panel. The heat from the cookware is transferred to the panel via a heat-conducting component, and then to the temperature sensing element at the bottom of the panel. Due to the reduced panel thickness, the heat transfer time from the cookware to the temperature sensing element is effectively shortened, resulting in a faster temperature response. Furthermore, reducing the panel thickness also improves the heating efficiency of induction heating.

[0007] Optionally, the heating components are staggered from the heat-conducting area in the vertical direction.

[0008] In the above technical solution, if the heating component overlaps with the heat-conducting area in the vertical direction, the heat generated by the heating component when it is working will be directly superimposed on the heat-conducting area, causing the temperature of the area to rise abnormally and affecting the temperature measurement accuracy of the temperature sensing element. After misalignment, the heat-conducting area only receives the heat transferred by the cookware, reducing interference from additional heat sources and accurately transmitting the true temperature of the cookware.

[0009] Optionally, the support assembly further includes a heat insulation component, which is spaced apart from the heat conduction component on the panel, and the two together support the cookware to maintain the gap.

[0010] In the above technical solutions, when a single heat-conducting component is used for support, the heat-conducting component needs to have a certain area to ensure the stability of the cookware. This can easily lead to an excessively large heat-conducting area, causing the heat from the bottom of the cookware to be quickly transferred to the panel through this large-area heat-conducting component, resulting in localized high temperatures on the panel, which still requires high temperature resistance. However, by adding heat-insulating components that are spaced apart from the heat-conducting component, the heat-conducting component can not only work together with the heat-conducting component to stably support the cookware and maintain the gap, but also reduce the area of ​​the heat-conducting component to only meet the heat conduction requirements for temperature measurement, thereby avoiding localized overheating of the panel due to an excessively large heat-conducting area.

[0011] Optionally, the number of heat insulation components is multiple, and the multiple heat insulation components are evenly distributed along the circumference, with the heat-conducting component located at the center of the circle and the heating component located around the center.

[0012] In the above technical solution, multiple heat insulation components are evenly distributed along the circumference to provide stable support for the cookware and improve the safety of using the cookware. The heat in the gaps can be dissipated from the gaps between the multiple heat insulation components, improving the uniformity of heat dissipation and making the temperature of the panel uniform. The heat conduction component is located at the center, and the heating component is located on the periphery of the center. The two form a radial division of the center and periphery, which makes it convenient to set the temperature measuring element away from the heating component.

[0013] Optionally, the thermal conductive element is larger than the thermal insulation element.

[0014] In the above technical solution, the contact area between the heat-conducting component and the bottom of the pot is large, the heat conduction area is large, and the heat transfer efficiency is high. At the same time, the panel area corresponding to the heat-conducting component is also larger, which can provide more sufficient installation space for the temperature measuring element.

[0015] Optionally, the heat insulation component is made of high-temperature resistant engineering plastic, aerogel, or heat-insulating ceramic wool; the heat-conducting component is made of thermally conductive silicone or thermally conductive ceramic.

[0016] In the above technical solutions, the heat insulation component made of the above materials has good heat insulation effect and large support force, and the heat conduction component made of the above materials has good heat conduction effect and large support force.

[0017] Optionally, the heat insulation and heat conduction components are elastic pads.

[0018] In the above technical solution, when the cookware is placed, the heat insulation component and the heat conduction component will come into contact with the bottom or panel of the cookware. The deformation characteristics of the elastic pad can absorb the impact force when the cookware is placed down, avoid rigid collision between the support component and the cookware or panel, improve the user experience and protect the panel and cookware.

[0019] Optionally, when the cookware is placed on the panel, the upper surfaces of the heat insulation component and the heat conduction component are on the same plane to keep the gap between the bottom of the cookware and the panel uniform.

[0020] In the above technical solution, the gap is kept uniform to avoid uneven heat dissipation and local overheating. At the same time, the bottom of the pot can contact all the supporting parts at the same time to ensure that the pot is placed stably and avoids tilting and shaking. In addition, the uniform gap can keep the bottom of the pot at a stable distance from the panel and the heating components below, so that the magnetic field strength of the heating components acts in a consistent manner, ultimately achieving uniform pot temperature.

[0021] Optionally, the height h of the gap is ≤ 1 mm.

[0022] In the above technical solution, the 1mm gap still allows a small amount of heat from the cookware to dissipate through air convection, effectively reducing the heat transferred to the panel. At the same time, the magnetic field strength of the heating element decreases rapidly with increasing distance. The small gap allows the magnetic field generated by the heating element to act more efficiently on the bottom of the cookware, and avoids excessive heat loss from the cookware. This prevents the cookware from heating up slowly and for longer heating times due to a large gap, ensuring the heating efficiency of the induction cooker and avoiding energy waste. In addition, if the gap is too large, the cookware may shift due to food turning or slight collisions, while the 1mm gap keeps the cookware in a close-fitting state, improving the stability of the cookware.

[0023] Optionally, the temperature sensing element is an NTC temperature sensor.

[0024] In the above technical solutions, the NTC temperature sensor is low in cost and its temperature measurement range and accuracy match the temperature measurement requirements of induction cookers.

[0025] The induction cooker also includes a control module electrically connected to the temperature measuring component. Its temperature control method includes the following steps: the heating component starts heating, the temperature measuring element collects the temperature T1 of the heat conduction area in real time, and the control module adjusts the output power of the heating component according to T1.

[0026] This method can adjust the heat in real time according to the actual temperature of the cookware. When T1 is close to the set temperature, the output power is reduced to avoid overheating. When T1 is below the set temperature, the output power is increased to supplement the heat, improve cooking efficiency, and reduce energy consumption during the cooking process. At the same time, when the cookware is dry-burning or the temperature rises abnormally, T1 will rise rapidly in sync. The control module can identify this in time and reduce the power or even stop the machine, improving the safety of the whole machine.

[0027] Compared with the prior art, the present invention has at least the following advantages: (1) By setting a gap to reduce the panel thickness, and by using a heat-conducting component with high thermal conductivity, an efficient and stable heat conduction channel is established between the bottom of the cookware and the panel, which effectively shortens the heat transfer time from the cookware to the temperature measuring element, resulting in a fast temperature measurement response speed, improving the temperature control accuracy and precision, and effectively preventing the cookware from overheating. (2) By using heat insulation components, the high temperature area of ​​the panel is strictly limited to a local area below the heat-conducting components, which greatly reduces the temperature of the panel as a whole. This not only allows for the selection of panels with lower temperature resistance and thinner thickness to improve induction heating efficiency, but also reduces the working environment temperature of the components below the panel, thus reducing the overall heat generation of the machine. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the distribution of the support components of this utility model.

[0029] In the diagram: 1. Cookware; 2. Heat insulation component; 3. Heat conduction component; 4. Fan; 5. Temperature sensing element; 6. Heating assembly; 7. Panel. Detailed Implementation

[0030] The present invention will now be described through specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in the present invention, and the scope of protection of the present invention is defined by the appended claims and any equivalents thereof.

[0031] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Unless otherwise specified, the raw materials and equipment used in this invention are conventional materials and equipment in the art and can be obtained through conventional commercial channels; unless otherwise specified, the methods used in this invention are conventional methods in the art.

[0032] Example 1: Reference Figure 1 to Figure 2As shown, this utility model provides an induction cooker, including a panel 7, a support assembly, a control module, a temperature measuring element 5 placed below the panel 7 for detecting the temperature of a cookware 1, and a heating assembly 6 for heating the cookware 1. The support assembly is disposed on the panel 7 and supports the cookware 1, forming a gap between the bottom of the cookware 1 and the panel 7. A heat-conducting element 3 forms a heat-conducting area on the panel 7. The temperature measuring element 5 is disposed at the bottom of the panel 7 and placed within the heat-conducting area, and is electrically connected to the control module. Since the heat-conducting element 3 can quickly transfer heat from the cookware 1 to the heat-conducting area of ​​the panel 7, the temperature measuring element 5 can obtain the actual temperature of the cookware 1 by detecting the temperature of the panel 7 in this area. In this embodiment, the heating assembly 6 is a coil. The temperature measuring element 5 is placed within the heat-conducting area, that is, the temperature measuring element 5 falls within the vertical projection of the heat-conducting element 3.

[0033] In the aforementioned induction cooker, a gap is formed between the bottom of the cookware 1 and the panel 7 through a support component, allowing heat from the cookware 1 to dissipate through the gap and significantly reducing the total heat transferred to the panel 7. This lowers the temperature resistance requirements of the panel 7, allowing for a reduction in its thickness, eliminating the need to maintain the original thickness of over 4mm. It also lowers the operating temperature of the components below the panel 7. The heat from the cookware 1 is transferred to the panel 7 via the heat-conducting component 3, and then to the temperature-sensing element 5 at the bottom of the panel 7. Since the thermal conductivity of the heat-conducting component 3 is higher than that of the panel 7 material, and the panel 7 thickness is reduced, the heat transfer time from the cookware 1 to the temperature-sensing element 5 is effectively shortened, resulting in a faster temperature response. Furthermore, reducing the thickness of the panel 7 also improves the heating efficiency of induction heating. Tests have shown that the induction cooker of this invention can reduce the thickness of the panel 7 to 2-3mm.

[0034] like Figure 1 As shown, the support assembly also includes a heat insulation component 2. The heat insulation component 2 and the heat-conducting component 3 are spaced apart on the panel 7, and together they support the cookware 1 to maintain the gap. When supported by a single heat-conducting component, in order to ensure the stability of the cookware, the heat-conducting component needs to have a certain area, which can easily lead to an excessively large heat-conducting area. The heat from the bottom of the cookware will be quickly transferred to the panel through this large-area heat-conducting component, causing local high temperatures on the panel, which still requires high temperature resistance. However, by adding heat insulation components that are spaced apart from the heat-conducting component, they can not only work together with the heat-conducting component to stably support the cookware to maintain the gap, but also reduce the area of ​​the heat-conducting component to only meet the heat conduction requirements for temperature measurement, thereby avoiding local overheating of the panel due to an excessively large heat-conducting area.

[0035] In this invention, the panel 7 can be made of microcrystalline glass, high-temperature resistant ceramic, or tempered glass, with microcrystalline glass being preferred. The thermal conductivity of the heat insulation component 2 must be lower than that of the panel 7, and the thermal conductivity of the heat conduction component 3 must be higher than that of the panel 7. Specifically, the heat insulation component 2 is made of high-temperature resistant engineering plastics (such as PEEK, PI), aerogel, or insulating ceramic wool; the heat conduction component 3 is made of thermally conductive silicone or thermally conductive ceramic. The heat insulation component 2 made of the above materials has good thermal insulation performance and high support strength, and the heat conduction component 3 made of the above materials has good thermal conductivity and high support strength.

[0036] In this invention, the temperature sensing element 5 can be a common contact-type temperature sensing element, such as a thermocouple, a PTC thermistor, or a semiconductor temperature sensor. Preferably, the temperature sensing element 5 is an NTC temperature sensor because NTC temperature sensors are low in cost and their temperature measurement range and accuracy match the temperature measurement requirements of an induction cooker.

[0037] Preferably, the heat insulation component 2 and the heat-conducting component 3 are elastic pads. In this embodiment, the heat insulation component 2 is made of aerogel, and the heat-conducting component 3 is made of thermally conductive silicone. When the cookware 1 is placed, the heat insulation component 2 and the heat-conducting component 3 will contact the bottom or panel 7 of the cookware 1. The deformation characteristics of the elastic pads can absorb the impact force when the cookware 1 is placed down, avoiding rigid collision between the support components and the cookware 1 or panel 7, improving the user experience and protecting the panel 7 and the cookware 1.

[0038] In a preferred embodiment of this utility model, such as Figure 1 As shown, the heating element 6 is staggered from the heat-conducting area in the vertical direction. If the heating element 6 overlaps with the heat-conducting area in the vertical direction, the heat generated by the heating element 6 during operation will be directly superimposed on the heat-conducting area, causing the temperature in that area to rise abnormally and affecting the temperature measurement accuracy of the temperature sensing element 5. After the stagger, the heat-conducting area only receives the heat transferred from the cookware 1, reducing interference from additional heat sources and accurately transmitting the true temperature of the cookware 1.

[0039] This utility model does not limit the specific distribution of the heat insulation component 2 and the heat conduction component 3. Its core design purpose is to achieve a preset gap between the bottom of the pot 1 and the panel 7 through the synergistic effect of the two, so as to achieve stable placement.

[0040] In this embodiment, as Figure 2As shown, four heat insulation components 2 are provided, and they are evenly distributed around the edge of the cookware 1 placement area on the panel 7. One heat-conducting component 3 is provided, located at its center, and the heating element 6 is located around the center. The multiple heat insulation components 2 evenly distributed around the circumference provide stable support for the cookware 1, improving its safety. The heat in the gaps can dissipate from the gaps between the multiple heat insulation components 2, improving the uniformity of heat dissipation and ensuring a consistent temperature throughout the panel 7. The heat-conducting component 3 is located at the center, and the heating element 6 is located around the center, forming a radial division between the center and the periphery, which facilitates the placement of the temperature sensing element 5 away from the heating element 6.

[0041] like Figure 2 As shown, the size of the heat-conducting component 3 is larger than that of the heat-insulating component 2. The heat-conducting component 3 has a larger contact area with the bottom of the pot 1, resulting in a larger heat-conducting area and higher heat transfer efficiency. At the same time, the panel area 7 corresponding to the heat-conducting component 3 is also larger, providing more ample installation space for the temperature sensing element 5.

[0042] like Figure 1 As shown, the upper surfaces of the heat insulation component 2 and the heat-conducting component 3 are on the same plane to ensure a uniform gap between the bottom of the pot 1 and the panel 7. This uniform gap prevents uneven heat dissipation and localized overheating. Simultaneously, the bottom of the pot 1 can contact all supporting components, ensuring the pot 1 is placed stably and preventing tilting or wobbling. Furthermore, the uniform gap allows the bottom of the pot 1 to maintain a stable distance from the panel 7 and the heating element 6 below, ensuring a consistent magnetic field strength of the heating element 6, ultimately achieving a uniform temperature for the pot 1.

[0043] In this embodiment, the height h of the gap is 1mm. Even with a tiny 1mm gap, a small amount of heat from the cookware 1 can still dissipate through air convection, effectively reducing the heat transferred to the panel 7. Simultaneously, the magnetic field strength of the heating component 6 decreases rapidly with increasing distance. This tiny gap allows the magnetic field generated by the heating component 6 to act more efficiently on the bottom of the cookware 1, preventing excessive heat loss and ensuring the heating efficiency of the induction cooker, thus avoiding energy waste. Furthermore, if the gap is too large, the cookware 1 may shift due to food movement or slight collisions, while the 1mm gap keeps the cookware 1 in a close-fitting state, improving its stability.

[0044] In this embodiment, the heat insulation component 2 and the heat conduction component 3 are bonded to the panel 7, allowing direct use of any cookware 1 of the appropriate size, thus demonstrating strong compatibility. In another embodiment, the heat insulation component 2 is bonded to the bottom of the cookware 1, and the heat conduction component 3 is bonded to the panel 7. The heat insulation component 2 moves as the cookware 1 is placed or removed, eliminating the need for alignment when placing the cookware 1, thus facilitating use. The connection method between the heat insulation component 2 and the heat conduction component 3 and the cookware 1 or the panel 7 is not limited to these; detachable connection structures such as snap-fit ​​connections can also be used. When using detachable connections, it is convenient to replace and maintain the support components individually, and the support position can be flexibly adjusted according to different cookware 1 sizes, further improving the applicability of the solution.

[0045] like Figure 1 As shown, a fan 4 is also provided below the panel 7. The air outlet direction of the fan 4 is set directly towards the heating component 6, which can directly dissipate heat from the heating component 6 that generates heat during operation, avoiding performance degradation or shortened lifespan caused by long-term high-temperature operation of the heating component 6. At the same time, the hot air generated by the fan 4 after heat exchange can flow out naturally through the structural gap between the induction cooker shell and the panel 7 and the heating component 6, without the need for additional complex air duct design. This simplifies the overall structure and helps to remove the heat accumulated at the bottom of the panel 7 and around the temperature measuring element 5, further alleviating the heat generation problem of the whole machine and ensuring the stable operation of each component.

[0046] The temperature control method of the induction cooker of this utility model includes the following steps: the heating component 6 starts heating, the temperature measuring element 5 collects the temperature T1 of the heat conduction area in real time, and the control module adjusts the output power of the heating component 6 according to T1.

[0047] Taking porridge cooking as an example, the above temperature control method is explained, including the following steps: Heating start-up phase: The heating component 6 starts up and operates at 80% of the rated power. The temperature sensing element 5 collects the temperature T1 of the heat conduction area in real time. When T1 rises from room temperature to 90℃, the control module determines that the porridge is about to bubble and reduces the power of the heating component 6 to 50% to prevent the porridge from overflowing due to continuous high temperature and rapid boiling. During the constant temperature cooking stage: After the power is reduced to 50%, if the temperature measuring element 5 detects that T1 is stable at 92℃~95℃, the control module maintains 50% power to ensure that the porridge is cooked slowly and does not overflow; if T1 is lower than 92℃, the power is briefly increased to 60% to supplement the heat, and then reduced back to 50% when T1 rises back to about 95℃, maintaining a constant temperature through small power fluctuations; Keep warm stage: When the user-set cooking time for porridge ends, the control module determines that the cooking has entered the final stage. If the temperature measuring element 5 detects that T1 has dropped to 85℃, the power of the heating element 6 will be reduced by 20% to stabilize T1 at 80℃~85℃. This avoids the porridge from cooling down too quickly and prevents the bottom of the porridge from sticking to the pot due to prolonged high temperature, until the user manually turns it off or enters standby mode.

[0048] Unless otherwise specified, the raw materials and equipment used in this utility model are all commonly used in the field; unless otherwise specified, the methods used in this utility model are all conventional methods in the field.

[0049] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. An induction cooker, characterized in that, It includes a panel (7), a support assembly, and a temperature measuring element (5) and a heating assembly (6) placed below the panel (7). The support assembly is located on the panel (7) and is used to support the cookware (1) so that a gap is formed between the bottom of the cookware (1) and the panel (7). The support assembly includes a heat-conducting element (3), which forms a heat-conducting area on the panel (7). The temperature measuring element (5) is located at the bottom of the panel (7) and placed in the heat-conducting area.

2. An induction cooker according to claim 1, characterized in that, The heating component (6) is staggered from the heat-conducting area in the vertical direction.

3. An induction cooker according to claim 1, characterized in that, The support assembly also includes a heat insulation component (2), which and the heat-conducting component (3) are spaced apart on the panel (7) and together support the cookware (1) to maintain the gap.

4. An induction cooker according to claim 3, characterized in that, The number of heat insulation components (2) is multiple, and the multiple heat insulation components (2) are evenly distributed along the circumference, with the heat conduction component (3) located at its center.

5. An induction cooker according to claim 3, characterized in that, The thermal conductive element (3) is larger than the thermal insulation element (2).

6. An induction cooker according to claim 3, characterized in that, The heat insulation component (2) is made of high-temperature resistant engineering plastic, aerogel or heat-insulating ceramic cotton; the heat-conducting component (3) is made of heat-conducting silicone or heat-conducting ceramic.

7. An induction cooker according to claim 3, characterized in that, The heat insulation component (2) and the heat conduction component (3) are elastic soft pads.

8. An induction cooker according to claim 3, characterized in that, The upper surfaces of the heat insulation component (2) and the heat conduction component (3) are on the same plane so that the gap between the bottom of the cookware (1) and the panel (7) remains uniform.

9. An induction cooker according to claim 8, characterized in that, The height h of the gap is ≤ 1 mm.

10. An induction cooker according to claim 1, characterized in that, The temperature sensing element (5) is an NTC temperature sensor.

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