Heat disc and cooking appliance

Abstract

The utility model provides a kind of heating disc and cooking utensil, heating disc includes: disc body, the surface of disc body towards pot body includes first camber surface and second camber surface, first camber surface and second camber surface are respectively arranged annularly around the middle part of disc body, second camber surface is around the outside of first camber surface and is connected with first camber surface, first camber surface and second camber surface are all arched to the side close to pot body, the radius of curvature of first camber surface is first curvature radius, the radius of curvature of second camber surface is second curvature radius, first curvature radius is different from second curvature radius;Temperature controller, in the middle part of disc body;In the section along the vertical direction of cooking utensil, the connecting line between the inner edge of first camber surface and the outer edge of second camber surface is target reference line, the junction of first camber surface and second camber surface is located on the side close to pot body of target reference line.The heating disc provided in the application can avoid affecting the detection results of the temperature controller, and improve the heat transfer efficiency.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and more specifically, to a heating plate and a cooking utensil. Background Technology

[0002] Currently, the heating plate includes an upward-arched plate surface, with the center of the plate surface located below the heating plate. The bottom of the pot body also has an arc-shaped structure for contact and cooperation with the plate surface of the heating plate to achieve heat transfer.

[0003] In related technologies, some solutions set the radius of curvature of the pot body's curved surface to be the same as that of the heating plate's surface. However, due to manufacturing tolerances, the pot body may come into contact with the inner ring of the heating plate. Since the thermostat is located at the through-hole in the inner ring of the heating plate, heat will preferentially transfer from the inner ring of the heating plate to the pot body, affecting the thermostat's detection accuracy and thus the cooking effect. Other solutions design the radius of curvature of the heating plate surface to be larger than the radius of curvature of the pot body's bottom to cover manufacturing tolerances. However, this design causes the contact point between the heating plate and the pot body to occur at the outer edge of the heating plate, with the gap distance at other locations gradually increasing towards the inner ring of the heating plate, forming an air insulation layer. This increases the thermal resistance between the heating plate and the pot body, affecting the uniformity of the temperature field in the cooking cavity and hindering effective heat transfer to the pot body, thus reducing heat transfer efficiency. If the difference in the radius of curvature between the pot body and the heating plate is reduced, the pot body may again come into contact with the inner ring of the heating plate. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the first aspect of this utility model provides a heating plate.

[0006] A second aspect of this utility model also provides a cooking utensil.

[0007] In view of this, the first aspect of the present invention provides a heating plate for a cooking utensil, the cooking utensil including a pot body, the heating plate for heating the pot body, the heating plate including: a plate body, the surface of the plate body facing the pot body including a first arc surface and a second arc surface, the first arc surface and the second arc surface being arranged in a ring around the middle of the plate body, the second arc surface surrounding the outer side of the first arc surface and connecting to the first arc surface, both the first arc surface and the second arc surface arching towards the side closer to the pot body, the radius of curvature of the first arc surface being a first radius of curvature, the radius of curvature of the second arc surface being a second radius of curvature, the first radius of curvature and the second radius of curvature being different; a thermostat, disposed in the middle of the plate body; wherein, in a cross section along the vertical direction of the cooking utensil, the line connecting the inner edge of the first arc surface and the outer edge of the second arc surface is a target reference line, and the connection point of the first arc surface and the second arc surface is located on the side of the target reference line closer to the pot body.

[0008] The heating plate provided by this utility model includes a plate body and a thermostat. The surface of the plate body facing the pot body includes a first arc surface and a second arc surface. Both the first arc surface and the second arc surface are arched towards the pot body. The first arc surface and the second arc surface are respectively arranged in a ring around the middle of the plate body, so that the first arc surface and the second arc surface are both surrounding the thermostat. The second arc surface surrounds the outer side of the first arc surface and connects to it. The first and second radii of curvature are different. In the cross-section of the plate along the vertical direction of the cooking utensil, the line connecting the inner edge of the first arc surface and the outer edge of the second arc surface serves as the target reference line. The connection point of the first and second arc surfaces is located on the side of the target reference line closer to the pot body. This makes the surface of the plate facing the pot body convex in the middle and lower on both sides. This ensures that the inner edge of the first arc surface and the outer edge of the second arc surface have a certain gap with the pot body. This avoids the problem of the radial width of the air layer in the middle being too wide due to the outer edge of the second arc surface contacting the pot body. It also avoids the pot body contacting the inner ring of the heating plate. This keeps the contact position between the pot body and the heating plate away from the thermostat, avoiding affecting the detection results of the thermostat and ensuring reliable control of the cooking process.

[0009] In some embodiments, the first radius of curvature may be greater than the second radius of curvature.

[0010] In this embodiment, the first radius of curvature of the first arc surface is greater than the second radius of curvature of the second arc surface, making the first arc surface relatively gentle and the second arc surface more curved. Thus, when the pot is placed on top of the heating plate, the greater curvature of the second arc surface allows its outer edge to move away from the bottom wall of the pot, preventing it from contacting the bottom wall. This means the contact point between the pot and the heating plate moves towards the center of the plate relative to the outer edge of the second arc surface, reducing the size of the air layer between the contact point and the center of the heating plate. This lowers the thermal resistance between the heating plate and the pot, improving the uniformity of the temperature field and the heat transfer efficiency within the pot. Simultaneously, the relatively gentle first arc surface ensures a certain gap between it and the pot, preventing contact between the pot and the heating plate on the inner ring of the heating plate. This keeps the contact point away from the thermostat, avoiding interference with the thermostat's detection results and ensuring reliable control of the cooking process.

[0011] In some embodiments, the heating plate may optionally include a heating tube disposed on the plate body, the heating tube being disposed near the junction of the first arc surface and the second arc surface.

[0012] In this embodiment, since the first radius of curvature of the first arc surface is greater than the second radius of curvature of the second arc surface, the contact position between the pot body and the heating plate moves towards the center compared to the outer edge of the heating plate and towards the outside compared to the inner ring of the heating plate. This makes the contact position between the pot body and the heating plate closer to the connection between the first and second arc surfaces. Therefore, the heating tube is positioned close to the connection between the first and second arc surfaces, making the contact position between the pot body and the plate closer to the heating tube, shortening the heat transfer distance between the heating tube and the pot body, thereby improving the heating efficiency of the heating plate and the energy efficiency of the cooking appliance.

[0013] It should be noted that the heating tube is located near the connection between the first arc surface and the second arc surface, including the heating tube being located on the side of the connection between the first arc surface and the second arc surface away from the middle of the plate, or the heating tube being located on the side of the connection between the first arc surface and the second arc surface near the middle of the plate, or the projection of the connection between the first arc surface and the second arc surface along the vertical direction of the cooking appliance at least partially coincides with the projection of the heating tube.

[0014] In some embodiments, optionally, the plate body includes a target position, and along the vertical direction of the cooking appliance, the heating tube is arranged opposite to the target position. With the center of the plate body as the center, the diameter of the circle containing the outer edge of the first arc surface is the first diameter, the diameter of the circle containing the target position is the second diameter, the ratio of the first diameter to the diameter of the plate body is the first ratio, the ratio of the second diameter to the diameter of the plate body is the second ratio, and the difference between the first ratio and the second ratio is less than or equal to 0.4.

[0015] In this embodiment, the difference between the first ratio and the second ratio limits the distance between the heating tube and the outer edge of the first arc surface, thereby limiting the distance between the heating tube and the connection point of the first and second arc surfaces. Designing the difference between the first and second ratios to be less than or equal to 0.4 ensures that the heating tube is located near the outer edge of the first arc surface, allowing the heat generated by the heating tube to directly act on the contact area between the pot and the plate, significantly shortening the heat transfer path and improving heat transfer efficiency.

[0016] In some embodiments, optionally, the first ratio is greater than or equal to 0.2 and less than or equal to 0.8; and / or the second ratio is greater than or equal to 0.2 and less than or equal to 0.8.

[0017] In this embodiment, the first ratio reflects the distance between the outer edge of the first arc surface and the outer edge of the pan body. The heating tube is positioned relative to the outer edge of the first arc surface. Therefore, if the first ratio is too large, the radial coverage of the first arc surface will be too large, causing the heating tube to be too close to the outer edge of the pan body. This results in a large air layer in the middle area between the pan body and the pot body, affecting the heating effect in the middle area of ​​the pot body. If the first ratio is too small, the radial coverage of the first arc surface will be small, causing the heating tube to be too close to the center of the pan body. This, in turn, makes the heating tube closer to the thermostat in the center of the pan body, which can easily affect the overall temperature control effect of the cooking appliance. Therefore, the first ratio is set between 0.2 and 0.8 to make the heating tube position more reasonable and ensure the cooking effect of the cooking appliance. Optionally, the second ratio reflects the position of the heating element. If the second ratio is too large, the heating element will be too close to the outer edge of the pan. If the second ratio is too small, the heating element will be too close to the center of the pan. Therefore, the second ratio is set between 0.2 and 0.8 so that the outer edge of the first arc surface is near the heating element, shortening the distance the heating element conducts heat to the pan and improving the energy efficiency of the cooking appliance.

[0018] In some embodiments, optionally, the first ratio is greater than or equal to 0.4 and less than or equal to 0.8; and / or the second ratio is greater than or equal to 0.4 and less than or equal to 0.8.

[0019] In this embodiment, setting the first ratio to be greater than or equal to 0.4 and less than or equal to 0.8 can prevent the outer edge of the first arc surface from being too close to the center of the plate, thereby preventing the heating tube from being too close to the center of the plate, and consequently preventing the heating tube from being too close to the thermostat in the center of the plate, which would affect the temperature control effect. Optionally, setting the second ratio to be greater than or equal to 0.4 and less than or equal to 0.8 can also prevent the heating tube from being too close to the center of the plate, thereby preventing the heating tube from being too close to the thermostat in the center of the plate, which would affect the temperature control effect.

[0020] In some embodiments, optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 10 mm and less than or equal to 400 mm; and / or the first radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm.

[0021] In this embodiment, if the difference between the first and second radii of curvature is too small, the radii of curvature of the first and second arc surfaces may become close due to deformation of the plate after repeated use or the influence of manufacturing tolerances. This causes the outer edge of the second arc surface to approach the pot body, making it easy for the pot body to come into contact with the plate body near the outer edge of the second arc surface. Consequently, a large air layer is formed between the outer edge of the pot body and the middle of the plate body, affecting the heat transfer effect from the heating plate to the pot body. Therefore, designing the difference between the first and second radii of curvature to be greater than or equal to 10 mm can shorten the heat transfer distance between the heating tube and the pot body, thereby ensuring the heat transfer efficiency of the heating tube. Optionally, if the first and second radii of curvature are too large, the surface of the heating plate will be too flat, affecting the compatibility between the heating plate and the pot. If the first and second radii of curvature are too small, the heating plate will arch too high, affecting the space occupied in the height direction of the cooking utensil. Therefore, setting the first radius of curvature to be greater than or equal to 400 mm and less than or equal to 900 mm, and / or the second radius of curvature to be greater than or equal to 400 mm and less than or equal to 900 mm can ensure the compatibility between the heating plate and the pot, and also prevent the heating plate from arching too high, thus ensuring the strength of the heating plate.

[0022] In some embodiments, optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm; and / or the first radius of curvature is greater than or equal to 600 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 550 mm and less than or equal to 750 mm.

[0023] In this embodiment, the difference between the first and second radii of curvature is set between 50mm and 350mm. This shortens the heat transfer distance between the heating element and the pot body, thereby ensuring the heat transfer efficiency of the heating element. It also avoids the problem of excessive vertical space occupation by the heating plate when the difference between the first and second radii of curvature is too large. Optionally, the first radius of curvature is greater than or equal to 600mm and less than or equal to 900mm; and / or the second radius of curvature is greater than or equal to 550mm and less than or equal to 750mm. This ensures the compatibility between the heating plate and the pot body while preventing excessive arching of the heating plate, thus guaranteeing its strength.

[0024] In some embodiments, optionally, the surface of the pan facing the pot body further includes: a third arc surface, the third arc surface being disposed around and connected to the second arc surface, the third arc surface being arched towards the side close to the pot body or recessed towards the side away from the pot body; wherein, the radius of curvature of the third arc surface is a third radius of curvature, and the second radius of curvature is greater than the third radius of curvature.

[0025] In this embodiment, the surface of the plate facing the pot also includes a third arc surface, which surrounds the second arc surface and is connected to it. The third arc surface arches towards the pot, giving the plate an overall arched shape towards the pot, or it is concave away from the pot, resulting in both an arched portion and a concave portion on the side facing the pot, which helps ensure proper positioning of the pot. Simultaneously, the second radius of curvature is larger than the third radius of curvature. When the third arc surface arches towards the pot, it continues to move away from the pot, further increasing the distance between the outer edge of the plate and the pot, causing the contact point between the pot and the plate to shift towards the center compared to related technologies. When the third arc surface is concave away from the pot, it bends away from the pot, thus preventing contact between the third arc surface and the pot.

[0026] In some embodiments, optionally, with the center of the disk body as the center, the diameter of the circle containing the inner edge of the third arc surface is the third diameter, and the ratio of the third diameter to the diameter of the disk body is the third ratio; the third ratio is greater than or equal to 0.2 and less than or equal to 1.

[0027] In this embodiment, the third ratio reflects the positional relationship between the third arc surface and the outer edge of the disk body. The third ratio is set between 0.2 and 1 so that the third arc surface has a certain distance from the middle of the disk body, thereby ensuring that the connection between the first arc surface and the second arc surface is far away from the middle of the disk body.

[0028] In some embodiments, the difference between the second radius of curvature and the third radius of curvature is optionally greater than or equal to 10 mm and less than or equal to 400 mm.

[0029] In this embodiment, if the difference between the second and third radii of curvature is too small, the radii of curvature of the second and third arc surfaces may become close due to deformation after repeated use or manufacturing tolerances. This can easily lead to the pot contacting the plate near the outer edge of the third arc surface, resulting in a large air layer between the outer edge of the third arc surface and the center of the plate, affecting the heat transfer effect from the heating plate to the pot. Conversely, if the difference between the second and third radii of curvature is too large, the third arc surface may become more curved, making it more likely to contact the pot at the edge, affecting the heating effect of the pot. This also makes the heating plate too tall in the vertical direction, hindering transportation and reducing the strength of the plate. Therefore, designing the difference between the second and third radii of curvature to be greater than or equal to 10 mm and less than or equal to 400 mm shortens the heat transfer distance between the heating element and the pot, thus ensuring the heat transfer efficiency of the heating element and the strength of the plate.

[0030] In some embodiments, optionally, the first radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or the third radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm.

[0031] In this embodiment, if the first, second, and third radii of curvature are too large, the surface of the heating plate will be too flat, affecting the compatibility between the heating plate and the pot. If the first, second, and third radii of curvature are too small, the height of the heating plate will be too high, affecting the space occupied in the height direction of the cooking utensil. Therefore, setting the first radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, and / or the second radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, and / or the third radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, can ensure the compatibility between the heating plate and the pot, and also avoid the heating plate from arching too high, thus ensuring the strength of the heating plate.

[0032] In some embodiments, optionally, when the third arc surface is recessed on the side away from the pot body: the third radius of curvature is greater than or equal to 5 mm and less than or equal to 900 mm.

[0033] In this embodiment, when the third arc surface is recessed on the side away from the pot body: the radius of the third curvature is set to be greater than or equal to 5 mm and less than or equal to 900 mm, so that there is a gap between the third arc surface and the pot body, avoiding contact between the pot body and the heating plate at the outer edge of the plate.

[0034] In some embodiments, optionally, when the heating power of the heating plate is greater than or equal to 300W and less than or equal to 450W: the diameter of the heating plate is greater than or equal to 100mm and less than or equal to 160mm; when the heating power of the heating plate is greater than or equal to 450W and less than or equal to 680W: the diameter of the heating plate is greater than or equal to 120mm and less than or equal to 180mm; when the heating power of the heating plate is greater than or equal to 680W and less than or equal to 1200W: the diameter of the heating plate is greater than or equal to 150mm and less than or equal to 220mm. In this embodiment, the heating plate can have different power types, and different heating power corresponds to different heating plate diameters, wherein the higher the heating power, the larger the corresponding diameter. Optionally, under different heating power conditions, the diameter of the heating plate can be set to greater than or equal to 100mm and less than or equal to 160mm; or the diameter of the heating plate can be set to greater than or equal to 120mm and less than or equal to 180mm; or the diameter of the heating plate can be set to greater than or equal to 150mm and less than or equal to 220mm, etc.

[0035] In some embodiments, the heating plate may optionally include a first side and a second side disposed opposite to each other, both the first arc surface and the second arc surface being located on the first side and arching away from the second side, wherein the second arc surface extends from the inner edge to the outer edge toward the second side.

[0036] In this embodiment, the first radius of curvature is larger than the second radius of curvature, making the second arc surface more curved. At the same time, the second arc surface extends from the inner edge to the outer edge towards the second side, so that the second arc surface is located below the horizontal plane where the first arc surface and the second arc surface connect. That is, the second arc surface extends from the inner edge to the outer edge of the second arc surface in a direction away from the pot body, so that the second arc surface will not bulge out of the first arc surface towards the pot body, so that the first arc surface and the second arc surface are smoothly connected, avoiding unevenness on the surface of the first side of the plate.

[0037] According to a second aspect of the present invention, a cooking utensil is also provided, comprising: a pot body; and a heating plate as described in any of the above embodiments, the heating plate being used to heat the pot body; wherein the bottom wall of the pot body arches into the pot body and is adapted to the plate body.

[0038] The cooking appliance provided in the second aspect of this utility model, since it includes the heating plate proposed in any of the above embodiments, has all the beneficial effects of the heating plate.

[0039] In addition, the bottom wall of the pot body arches into the pot body and is adapted to the plate body. For example, when the heating plate arches upwards towards the surface of the pot body, the bottom wall of the pot body arches into the pot body, thereby adapting the heating plate to the pot body and reducing the gap between the heating plate and the pot body.

[0040] In some embodiments, optionally, the surface of the bottom wall of the pot facing the heating plate includes a fourth arc surface and a fifth arc surface, the fifth arc surface surrounds the outside of the fourth arc surface and is connected to the fourth arc surface, and the radius of curvature of the fifth arc surface is greater than the radius of curvature of the fourth arc surface.

[0041] In this embodiment, the bottom surface of the pot body includes a fourth arc surface and a fifth arc surface with different radii of curvature. The fifth arc surface surrounds the fourth arc surface, and the radius of curvature of the fourth arc surface is smaller than that of the fifth arc surface. This makes the fourth arc surface steeper and the fifth arc surface gentler. The steeper fourth arc surface keeps it away from the heating plate, preventing the heating plate from contacting the fourth arc surface at the inner edge of the heating plate. The gentler fifth arc surface maintains a certain gap between the outer edge of the fifth arc surface and the heating plate, thus preventing the pot body from contacting the heating plate at the outer edge of the heating plate. This causes the contact position between the pot body and the heating plate to shift from the edge area in related technologies to the center of the arched portion, reducing the thickness of the air insulation layer between the central area of ​​the pot body and the heating plate, reducing heat transfer resistance, improving the heat conduction efficiency to the cooking cavity, and thus improving the energy efficiency of the cooking appliance.

[0042] In some embodiments, optionally, the radius of curvature of the fourth arc surface is smaller than the radius of curvature of the first arc surface, and the radius of curvature of the fifth arc surface is larger than the radius of curvature of the second arc surface.

[0043] In this embodiment, the radius of curvature of the fourth arc surface is smaller than that of the first arc surface, causing the fourth arc surface to curve further away from the heating plate compared to the first arc surface, thereby ensuring that the fourth arc surface does not contact the first arc surface at the inner ring of the heating plate. The radius of curvature of the fifth arc surface is larger than that of the second arc surface, ensuring that the outer edge of the fifth arc surface does not contact the heating plate, thus guaranteeing a proper contact position between the pot body and the heating plate.

[0044] In some embodiments, the contact position between the pot body and the heating plate is optionally located near the outer edge of the first arc surface.

[0045] In this embodiment, the contact position between the pot body and the heating plate is located close to the outer edge of the first arc surface. This not only avoids affecting the detection results of the temperature controller and ensures reliable control of the cooking process, but also reduces the size of the air layer between the contact position between the pot body and the heating plate and the middle of the heating plate, thereby reducing the thermal resistance between the heating plate and the pot body and improving the uniformity of the temperature field and the heat transfer efficiency inside the pot.

[0046] In some embodiments, the cooking appliance may optionally include any one of a rice cooker, an electric pressure cooker, and an electric slow cooker.

[0047] In this embodiment, the cooking appliance can be any one of a rice cooker, an electric pressure cooker, and an electric slow cooker.

[0048] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0049] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0050] Figure 1 One of the structural schematic diagrams of the heating plate according to an embodiment of the present invention is shown;

[0051] Figure 2 A second schematic diagram of the structure of the heating plate according to an embodiment of the present invention is shown;

[0052] Figure 3 The third schematic diagram shows the structure of the heating plate according to an embodiment of the present invention;

[0053] Figure 4 The fourth schematic diagram shows the structure of the heating plate according to an embodiment of the present invention;

[0054] Figure 5 The fifth schematic diagram shows the structure of the heating plate according to an embodiment of the present invention;

[0055] Figure 6 The sixth schematic diagram shows the structure of the heating plate according to an embodiment of the present invention;

[0056] Figure 7 The seventh schematic diagram shows the structure of the heating plate according to an embodiment of the present invention;

[0057] Figure 8 This is shown as diagram eight of the structural schematic diagrams of a heating plate according to an embodiment of the present invention;

[0058] Figure 9 One of the structural schematic diagrams of a cooking appliance according to an embodiment of the present invention is shown;

[0059] Figure 10 The second schematic diagram shows the structure of a cooking appliance according to an embodiment of the present invention.

[0060] in, Figures 1 to 10 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0061] 1. Cooking appliance; 2. Heating plate; 20. Plate body; 200. First arc surface; 202. Second arc surface; 204. Third arc surface; 22. Heating element; 24. Thermostat; 3. Pot body; 30. Fourth arc surface; 32. Fifth arc surface; 4. Pot body; 5. Lid body; 6. Insulation cover. Detailed Implementation

[0062] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0063] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0064] The following reference Figures 1 to 10 The present invention describes a heating plate 2 and a cooking appliance 1 according to some embodiments thereof.

[0065] like Figure 1 , Figure 2 , Figure 8 , Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, the present invention proposes a heating plate 2 for use in a cooking utensil 1, the cooking utensil 1 including a pot body 3, and the heating plate 2 for supplying heat to the pot body 3.

[0066] The heating plate 2 includes a plate body 20 and a thermostat 24. The surface of the plate body 20 facing the pot body 3 includes a first arc surface 200 and a second arc surface 202. The first arc surface 200 and the second arc surface 202 are respectively arranged in a ring around the middle of the plate body 20. The second arc surface 202 surrounds the outside of the first arc surface 200 and is connected to the first arc surface 200. Both the first arc surface 200 and the second arc surface 202 arch towards the side closer to the pot body 3. The radius of curvature of the first arc surface 200 is a first radius of curvature, and the radius of curvature of the second arc surface 202 is a second radius of curvature. The first radius of curvature and the second radius of curvature are different. The thermostat 24 is located in the middle of the plate body 20. In a cross-section along the vertical direction of the cooking appliance, the line connecting the inner edge of the first arc surface 200 and the outer edge of the second arc surface 202 is the target reference line L4. The connection point of the first arc surface 200 and the second arc surface 202 is located on the side of the target reference line L4 closer to the pot body 3.

[0067] The heating plate 2 provided by this utility model includes a plate body 20 and a heating tube 22. The surface of the plate body 20 facing the pot body 3 includes a first arc surface 200 and a second arc surface 202. Both the first arc surface 200 and the second arc surface 202 are arched towards the pot body 3. The first arc surface 200 and the second arc surface 202 are respectively arranged in a ring around the middle part of the plate body 20, so that the first arc surface 200 and the second arc surface 202 are both surrounding the thermostat 24. The second arc surface 202 surrounds the outer side of the first arc surface 200 and connects to the first arc surface 200. The first radius of curvature is different from the second radius of curvature. In the cross-section of the plate body 20 along the vertical direction of the cooking utensil, the line connecting the inner edge of the first arc surface 200 and the outer edge of the second arc surface 202 serves as the target reference line L4. The connection point of the first arc surface 200 and the second arc surface 202 is located on the side of the target reference line L4 closer to the pot body, making the surface of the plate body 20 facing the pot body 3 convex in the middle and lower on both sides. This ensures that the inner edge of the first arc surface 200 and the outer edge of the second arc surface 202 have a certain gap with the pot body 3, which can avoid the problem of the radial width of the air layer in the middle being too wide due to the contact between the outer edge of the second arc surface 202 and the pot body 3. It can also avoid the contact between the pot body 3 and the heating plate 2 on the inner ring of the heating plate 2, thus keeping the contact position between the pot body 3 and the heating plate 2 away from the thermostat 24, avoiding affecting the detection results of the thermostat 24, and thus ensuring reliable control of the cooking process.

[0068] Optionally, the heating plate 2 has a through hole in the middle, the thermostat 24 is located in the through hole, and the first arc surface 200 surrounds the periphery of the through hole. It can be understood that the inner ring of the heating plate 2 is the periphery of the through hole.

[0069] It is understandable that the first arc surface 200 and the second arc surface 202 both arch towards the side closer to the pot body 3, so that the center of the first arc surface 200 and the second arc surface 202 are both located on the side of the heating plate 2 away from the pot body 3.

[0070] It is understandable that the connection point of the first arc surface 200 and the second arc surface 202 is located on the side of the target reference line L4 closer to the pot body 3, so that the connecting line where the first arc surface 200 and the second arc surface 202 are connected is located on the side of the target reference line L4 closer to the pot body 3, that is, the outer edge of the first arc surface 200 and the inner edge of the second arc surface 202 are located on the side of the target reference line L4 closer to the pot body 3.

[0071] In some embodiments, the first radius of curvature may be greater than the second radius of curvature.

[0072] In this embodiment, the first radius of curvature of the first arc surface 200 is greater than the second radius of curvature of the second arc surface 202, making the first arc surface 200 relatively flat and the second arc surface 202 more curved. Thus, when the pot body 3 is placed on top of the heating plate 2, the outer edge of the second arc surface 202 can be moved away from the bottom wall of the pot body 3 due to the greater curvature of the second arc surface 202. Consequently, the outer edge of the second arc surface 202 does not contact the bottom wall of the pot body 3. That is, the contact position between the pot body 3 and the plate 20 moves towards the center of the plate 20 relative to the outer edge of the second arc surface 202, thereby reducing the size of the air layer between the contact position between the pot body 3 and the heating plate 2 and the center of the heating plate 2. This reduces the thermal resistance between the heating plate 2 and the pot body 3, and improves the uniformity of the temperature field and the heat transfer efficiency within the pot body 3. Meanwhile, since the first arc surface 200 is relatively flat, it can ensure that there is a certain gap between the first arc surface 200 and the pot body 3, avoiding contact between the pot body 3 and the heating plate 2 on the inner ring of the heating plate 2. This keeps the contact position between the pot body 3 and the heating plate 2 away from the thermostat 24, avoiding affecting the detection results of the thermostat 24, and thus ensuring reliable control of the cooking process.

[0073] In some embodiments, the heating plate 2 may optionally include a heating tube 22 disposed on the plate body 20, with the heating tube 22 disposed near the connection between the first arc surface 200 and the second arc surface 202.

[0074] In this embodiment, since the first radius of curvature of the first arc surface 200 is greater than the second radius of curvature of the second arc surface 202, the contact position between the pot body 3 and the heating plate 2 moves towards the center compared to the outer edge of the heating plate 2, and towards the outside compared to the inner ring of the heating plate 2. This makes the contact position between the pot body 3 and the heating plate 2 closer to the connection between the first arc surface 200 and the second arc surface 202. Therefore, the heating tube is set close to the connection between the first arc surface 200 and the second arc surface 202, making the contact position between the pot body 3 and the plate 20 closer to the heating tube 22, shortening the heat transfer distance between the heating tube 22 and the pot body 3, thereby improving the heating efficiency of the heating plate 2 and the energy efficiency of the cooking appliance 1.

[0075] It should be noted that the heating tube 22 is located near the connection between the first arc surface 200 and the second arc surface 202, including the heating tube 22 being located on the side of the connection between the first arc surface 200 and the second arc surface 202 away from the middle of the plate body 20, or the heating tube 22 being located on the side of the connection between the first arc surface 200 and the second arc surface 202 near the middle of the plate body 20, or the projection of the connection between the first arc surface 200 and the second arc surface 202 along the vertical direction of the cooking appliance 1 at least partially coincides with the projection of the heating tube 22.

[0076] Optionally, the first arc surface 200 and the second arc surface 202 can be directly connected, that is, the outer edge of the first arc surface 200 is the inner edge of the second arc surface 202, so that the first arc surface 200 and the second arc surface 202 are connected at the outer edge of the first arc surface 200; or the first arc surface 200 and the second arc surface 202 can also be connected through another arc surface, that is, the outer edge of the first arc surface 200 and the inner edge of the second arc surface 202 are connected through an arc surface, so that the connection between the first arc surface 200 and the second arc surface 202 can also be an annular curved surface.

[0077] Optionally, such as Figure 2 and Figure 3 As shown, the tangent line of the circle containing the outer edge of the first arc surface 200 along the vertical direction of the cooking appliance 1 is the first reference line L1, and the outer edge of the first arc surface 200 is located on the first reference line L1.

[0078] Optionally, the pot body 3 can contact the heating plate 2. Optionally, the contact position between the pot body 3 and the heating plate 2 is located at the connection between the first arc surface 200 and the second arc surface 202, or the contact position between the pot body 3 and the heating plate 2 is located on the second arc surface 202.

[0079] Optionally, such as Figure 2 As shown, when the outer edge of the first arc surface 200 coincides with the inner edge of the second arc surface 202, the second arc surface 202 extends away from the pot body 3 from its inner edge to its outer edge, such that the second arc surface 202 is entirely below the horizontal plane where the first and second arc surfaces 200 meet. That is, in the vertical direction of the cooking appliance 1, the second arc surface 202 does not protrude beyond the first arc surface 200 towards the pot body 3. The horizontal plane where the first and second arc surfaces 200 meet is perpendicular to the vertical direction of the cooking appliance 1. Of course, at least a portion of the second arc surface 202 may protrude beyond the first arc surface 200 towards the pot body 3.

[0080] Optionally, the first arc surface 200 and the second arc surface 202 are smoothly connected at the connection point.

[0081] Optionally, at least a portion of the surface of the pan body 20 facing the pot body 3 is arched in the direction of the pot body 3, and the first arc surface 200 and the second arc surface 202 are located on the surface of the pan body 20 that is arched in the direction of the pot body 3.

[0082] like Figure 1 , Figure 2 and Figure 3As shown, in some embodiments, optionally, the plate body 20 includes a target position A. Along the vertical direction of the cooking appliance 1, the heating tube 22 is arranged opposite to the target position A. With the center of the plate body 20 as the center, the diameter of the circle containing the outer edge of the first arc surface 200 is the first diameter D1, and the diameter of the circle containing the target position A is the second diameter D2. The ratio of the first diameter D1 to the diameter D4 of the plate body 20 is the first ratio, and the ratio of the second diameter D2 to the diameter D4 of the plate body 20 is the second ratio. The difference between the first ratio and the second ratio is less than or equal to 0.4.

[0083] In this embodiment, the difference between the first ratio and the second ratio limits the distance between the heating tube 22 and the outer edge of the first arc surface 200, thereby limiting the distance between the heating tube 22 and the connection point between the first arc surface 200 and the second arc surface 202. Designing the difference between the first ratio and the second ratio to be less than or equal to 0.4 ensures that the heating tube 22 is located near the outer edge of the first arc surface 200, allowing the heat generated by the heating tube 22 to directly act on the contact area between the pot body 3 and the plate body 20, significantly shortening the heat transfer path and improving heat transfer efficiency.

[0084] Optionally, in the orthographic projection along the vertical direction of the cooking appliance 1, the projection of the position where the pot body 3 contacts the heating plate 2 at least partially coincides with the projection of the heating tube 22.

[0085] It is understood that the heating element 22 is positioned relative to the target position A, which may include the geometric center of the heating element 22 being positioned relative to the target position A. For example, in the orthographic projection along the vertical direction of the cooking appliance 1, the projection of the target position A coincides with the heating element 22. It is understood that the difference between the first ratio and the second ratio is greater than or equal to 0.

[0086] It is understandable that when the difference between the first ratio and the second ratio is too large, the distance between the heating tube 22 and the outer edge of the first arc surface 200 is too large, which makes the heating tube 22 closer to the outer edge of the heating plate 2 or closer to the middle of the heating plate 2. This results in the heating tube 22 being far from the contact position between the pot body 3 and the heating plate 2, thereby reducing the heat transfer efficiency.

[0087] Optionally, the heating element 22 is arranged in a ring shape, and the center line of the heating element 22 is also arranged in a ring shape. Optionally, the center line of the heating element 22 is positioned opposite to the target position A along the vertical direction of the cooking appliance 1.

[0088] Optionally, the tangent line of the circle containing the target position A along the vertical direction of the cooking appliance 1 is the second reference line L2.

[0089] In some embodiments, optionally, the first ratio is greater than or equal to 0.2 and less than or equal to 0.8; and / or the second ratio is greater than or equal to 0.2 and less than or equal to 0.8.

[0090] In this embodiment, the first ratio reflects the distance between the outer edge of the first arc surface 200 and the outer edge of the plate 20. The heating tube 22 is positioned relative to the outer edge of the first arc surface 200. Therefore, if the first ratio is too large, the radial coverage of the first arc surface 200 will be too large, causing the heating tube 22 to be too close to the outer edge of the plate 20. This results in a large air layer in the middle area between the plate 20 and the pot 3, affecting the heating effect in the middle area of ​​the pot 3. If the first ratio is too small, the radial coverage of the first arc surface 200 will be too small, causing the heating tube 22 to be too close to the center of the plate 20. This makes the heating tube 22 even closer to the center of the plate 20, and thus closer to the thermostat in the center of the plate 20, which can easily affect the overall temperature control effect of the cooking appliance 1. Therefore, the first ratio is set between 0.2 and 0.8 to make the position of the heating tube 22 more reasonable and ensure the cooking effect of the cooking appliance 1. Optionally, the size of the second ratio reflects the placement of the heating tube 22. If the second ratio is too large, the heating tube 22 will be too close to the outer edge of the plate 20. If the second ratio is too small, the heating tube 22 will be too close to the middle of the plate 20. Therefore, the second ratio is set between 0.2 and 0.8, so that the outer edge of the first arc surface 200 is located near the heating tube 22, shortening the distance of the heating tube 22 to conduct heat to the pot 3 and improving the energy efficiency of the cooking appliance 1.

[0091] Understandably, a thermostat is installed in the middle of the pan body 20, which is used to detect the temperature value of the pot body 3.

[0092] In some embodiments, optionally, the first ratio is greater than or equal to 0.4 and less than or equal to 0.8; and / or the second ratio is greater than or equal to 0.4 and less than or equal to 0.8.

[0093] In this embodiment, setting the first ratio to be greater than or equal to 0.4 and less than or equal to 0.8 can prevent the outer edge of the first arc surface 200 from being too close to the center of the plate body 20, thereby preventing the heating tube 22 from being too close to the center of the plate body 20, and further preventing the heating tube 22 from being too close to the thermostat in the center of the plate body 20, which would affect the temperature control effect. Optionally, setting the second ratio to be greater than or equal to 0.4 and less than or equal to 0.8 can also prevent the heating tube 22 from being too close to the center of the plate body 20, thereby preventing the heating tube 22 from being too close to the thermostat in the center of the plate body 20, which would affect the temperature control effect.

[0094] In some embodiments, optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 10 mm and less than or equal to 400 mm; and / or the first radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm.

[0095] In this embodiment, if the difference between the first radius of curvature and the second radius of curvature is too small, the first arc surface 200 and the second arc surface 202 may become close due to deformation after repeated use of the plate 20 or the influence of manufacturing tolerances. This causes the outer edge of the second arc surface 202 to approach the pot body 3, which in turn causes the pot body 3 to come into contact with the plate 20 near the outer edge of the second arc surface 202. Consequently, a large air layer is formed between the outer edge of the pot body 3 and the middle of the plate 20, affecting the heat transfer effect from the heating plate 2 to the pot body 3. Therefore, designing the difference between the first radius of curvature and the second radius of curvature to be greater than or equal to 10 mm can shorten the heat transfer distance between the heating tube 22 and the pot body 3, thereby ensuring the heat transfer efficiency of the heating tube 22. Optionally, if the first and second radii of curvature are too large, the surface of the heating plate 2 will be too flat, which will affect the compatibility between the heating plate 2 and the pot body 3. If the first and second radii of curvature are too small, the height of the heating plate 2 will be too high, which will affect the space occupied in the height direction of the cooking utensil 1. Therefore, setting the first radius of curvature to be greater than or equal to 400 mm and less than or equal to 900 mm, and / or the second radius of curvature to be greater than or equal to 400 mm and less than or equal to 900 mm can ensure the compatibility between the heating plate 2 and the pot body 3, and also prevent the heating plate 2 from arching too high, thus ensuring the strength of the heating plate 2.

[0096] In some embodiments, optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm; and / or the first radius of curvature is greater than or equal to 600 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 550 mm and less than or equal to 750 mm.

[0097] In this embodiment, the difference between the first radius of curvature and the second radius of curvature is set between 50mm and 350mm. This shortens the heat transfer distance between the heating tube 22 and the pot body 3, thereby ensuring the heat transfer efficiency of the heating tube 22. It also avoids the problem of excessive vertical space occupation of the plate body 20 when the difference between the first and second radii of curvature is too large. Optionally, the first radius of curvature is greater than or equal to 600mm and less than or equal to 900mm; and / or the second radius of curvature is greater than or equal to 550mm and less than or equal to 750mm. This ensures the compatibility between the heating plate 2 and the pot body 3 while preventing the heating plate 2 from arching too high, thus guaranteeing the strength of the heating plate 2.

[0098] Optionally, the difference between the first radius of curvature and the second radius of curvature can be set to any value among 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, and 350mm, or any value between any two values.

[0099] Optionally, the first radius of curvature is any value among 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, and 900mm, or any value between any two of these values.

[0100] Optionally, the second radius of curvature is any value among 550mm, 600mm, 650mm, 700mm, and 750mm, or any value between any two values.

[0101] like Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, in some embodiments, optionally, the surface of the plate 20 facing the pot 3 further includes: a third arc surface 204, which surrounds and is connected to the second arc surface 202, and the third arc surface 204 arches towards the side closer to the pot 3 or is recessed towards the side away from the pot 3; wherein, the radius of curvature of the third arc surface 204 is a third radius of curvature, and the second radius of curvature is greater than the third radius of curvature.

[0102] In this embodiment, the surface of the plate 20 facing the pot 3 also includes a third arc surface 204, which surrounds the second arc surface 202 and is connected to it. The third arc surface 204 arches towards the side closer to the pot 3, giving the plate 20 an overall shape that arches towards the pot 3. Alternatively, the third arc surface 204 may be recessed towards the side away from the pot 3, so that the side of the plate 20 facing the pot 3 has both an arched portion towards the pot 3 and a recessed portion away from the pot 3, which helps ensure the positioning of the pot 3. Meanwhile, the second radius of curvature is greater than the third radius of curvature. When the third arc surface 204 arches towards the side closer to the pot body 3, the third arc surface 204 continues to move away from the pot body 3, further increasing the distance between the outer edge of the plate 20 and the pot body 3, so that the contact position between the pot body 3 and the plate 20 moves towards the center compared to related technologies; when the third arc surface 204 is concave in the direction away from the pot body 3, the third arc surface 204 bends in the direction away from the pot body 3, so that the third arc surface 204 moves away from the pot body 3, thereby avoiding contact between the third arc surface 204 and the pot body 3.

[0103] Optionally, when the outer bottom wall of the pot body 3 arches inward and the arched surface is a single arc, the radius of curvature of the outer bottom wall of the pot body 3 is the same as the radius of curvature of the second arc surface 202, and the pot body 3 and the heating plate 2 are in contact in the area where the second arc surface 202 is located. In order to ensure that the pot body 3 and the heating plate 2 are in contact in the area where the second arc surface 202 is located, and to avoid the presence of gaps in this area causing air layer thermal resistance, which would affect heating performance and thermal efficiency, it is necessary to have gaps between the pot body 3 and the heating plate 2 in the areas corresponding to the first arc surface 200 and the third arc surface 204. Therefore, it is necessary to ensure that: the radius of curvature of the portion of the outer bottom wall of the pot body 3 corresponding to the first arc surface 200 is smaller than the first radius of curvature, and the radius of curvature of the portion of the outer bottom wall of the pot body 3 corresponding to the third arc surface 204 is larger than the third radius of curvature. Thus, the first radius of curvature is larger than the second radius of curvature, and the second radius of curvature is larger than the third radius of curvature.

[0104] It is understandable that when the third arc surface 204 arches towards the side closer to the pot body 3, the center of the third arc surface 204 is located on the side of the heating plate 2 away from the pot body 3. When the third arc surface 204 is concave towards the side away from the pot body 3, the center of the third arc surface 204 is located on the side of the heating plate 2 closer to the pot body 3.

[0105] Optionally, when the disk body 20 includes a first arc surface 200, a second arc surface 202 and a third arc surface 204, the outer edge of the disk body 20 is the outer edge of the third arc surface 204.

[0106] like Figure 5 As shown, in some embodiments, optionally, with the center of the disk body 20 as the center, the diameter of the circle containing the inner edge of the third arc surface 204 is the third diameter D3, and the ratio of the third diameter D3 to the diameter D4 of the disk body 20 is the third ratio; the third ratio is greater than or equal to 0.2 and less than or equal to 1.

[0107] In this embodiment, the third ratio reflects the positional relationship between the third arc surface 204 and the outer edge of the disk body 20. The third ratio is set between 0.2 and 1 so that the third arc surface 204 and the middle of the disk body 20 have a certain distance, thereby ensuring that the connection between the first arc surface 200 and the second arc surface 202 is far away from the middle of the disk body 20.

[0108] It is understandable that when the third ratio is equal to 1, the outer edge of the third arc surface 204 is the outer edge of the disk body 20.

[0109] Optionally, the third ratio is greater than or equal to 0.6 and less than 1.

[0110] It is understandable that the third ratio is greater than the second ratio, and the second ratio is greater than the first ratio, so that the center line of the heating tube 22 is located between the outer edge of the first arc surface 200 and the outer edge of the second arc surface 202.

[0111] In some embodiments, the difference between the second radius of curvature and the third radius of curvature is optionally greater than or equal to 10 mm and less than or equal to 400 mm.

[0112] In this embodiment, if the difference between the second and third radii of curvature is too small, the radii of curvature of the second arc surface 202 and the third arc surface 204 may become close due to deformation after repeated use of the plate 20 or the influence of manufacturing tolerances. This can easily cause the pot 3 to come into contact with the plate 20 near the outer edge of the third arc surface 204, resulting in a large air layer between the outer edge of the third arc surface 204 and the middle of the plate 20, which affects the heat transfer effect from the heating plate 2 to the pot 3. If the difference between the second and third radii of curvature is too large, the third arc surface 204 may become more curved, making it easier for it to come into contact with the pot 3 at the edge, affecting the heating effect of the pot 3. It can also easily cause the heating plate 2 to be too tall in the vertical direction, which is not conducive to transportation and will also reduce the strength of the plate 20. Therefore, designing the difference between the second and third radii of curvature to be greater than or equal to 10 mm and less than or equal to 400 mm can shorten the heat transfer distance between the heating tube 22 and the pot body 3, thereby ensuring the heat transfer efficiency of the heating tube 22 and the strength of the plate body 20.

[0113] Optionally, the difference between the second radius of curvature and the third radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm.

[0114] In some embodiments, optionally, the first radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or the second radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or the third radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm.

[0115] In this embodiment, if the first, second, and third radii of curvature are too large, the surface of the heating plate 2 will be too flat, affecting the compatibility between the heating plate 2 and the pot body 3. If the first, second, and third radii of curvature are too small, the height of the heating plate 2 will be too high, thus affecting the space occupied in the height direction of the cooking utensil 1. Therefore, setting the first radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, and / or the second radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, and / or the third radius of curvature to be greater than or equal to 500 mm and less than or equal to 900 mm, can ensure the compatibility between the heating plate 2 and the pot body 3, and can also prevent the heating plate 2 from arching too high, thus ensuring the strength of the heating plate 2.

[0116] In some embodiments, optionally, when the third arc surface 204 is recessed to the side away from the pot body 3: the third radius of curvature is greater than or equal to 5 mm and less than or equal to 900 mm.

[0117] In this embodiment, when the third arc surface 204 is recessed to the side away from the pot body 3: the third radius of curvature is set to be greater than or equal to 5 mm and less than or equal to 900 mm, so that there is a gap between the third arc surface 204 and the pot body 3, so as to avoid the pot body 3 and the heating plate 2 from contacting at the outer edge of the plate body 20.

[0118] Optionally, the third radius of curvature is greater than or equal to 10 mm and less than or equal to 100 mm.

[0119] Optionally, the third radius of curvature is any value among 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, and 100mm.

[0120] Optionally, the difference between the second radius of curvature and the third radius of curvature is greater than or equal to 100 mm.

[0121] In some embodiments, optionally, when the heating power of the heating plate 2 is greater than or equal to 300W and less than or equal to 450W: the diameter of the heating plate 2 is greater than or equal to 100mm and less than or equal to 160mm; when the heating power of the heating plate 2 is greater than or equal to 450W and less than or equal to 680W: the diameter of the heating plate 2 is greater than or equal to 120mm and less than or equal to 180mm; when the heating power of the heating plate 2 is greater than or equal to 680W and less than or equal to 1200W: the diameter of the heating plate 2 is greater than or equal to 150mm and less than or equal to 220mm.

[0122] In this embodiment, the heating plate 2 can have different power types. Different heating powers correspond to different diameters of the heating plate 2, with higher heating powers resulting in larger diameters. Optionally, under different heating powers, the diameter of the heating plate 2 can be set to be greater than or equal to 100 mm and less than or equal to 160 mm; or greater than or equal to 120 mm and less than or equal to 180 mm; or greater than or equal to 150 mm and less than or equal to 220 mm, etc.

[0123] In some embodiments, the heating plate 2 may optionally include a first side and a second side disposed opposite to each other, wherein the first arc surface 200 and the second arc surface 202 are both located on the first side and arched away from the second side, wherein the second arc surface 202 extends from the inner edge to the outer edge toward the second side.

[0124] In this embodiment, the first radius of curvature is greater than the second radius of curvature, making the second arc surface 202 more curved. At the same time, the second arc surface 202 extends from the inner edge to the outer edge towards the second side, so that the second arc surface 202 is located below the horizontal plane where the first arc surface 200 and the second arc surface 202 are connected. That is, the second arc surface 202 extends from the inner edge to the outer edge of the second arc surface 202 away from the pot body 3, so that the second arc surface 202 will not bulge out of the first arc surface 200 towards the pot body 3, so that the first arc surface 200 and the second arc surface 202 are smoothly connected, avoiding unevenness on the surface of the first side of the plate body 20.

[0125] It is understandable that the horizontal plane where the first arc surface 200 and the second arc surface 202 meet is perpendicular to the vertical direction of the cooking utensil 1.

[0126] Optionally, the pot body 3 is located on the first side of the heating plate 2, and the first and second sides of the heating plate 2 are two sides arranged opposite each other along the vertical direction of the cooking appliance 1.

[0127] like Figure 9 and Figure 10 As shown, according to one embodiment of the present invention, a cooking utensil 1 is also provided, comprising: a pot body 3; and a heating plate 2 as provided in any of the above embodiments, the heating plate 2 being used to heat the pot body 3, wherein the bottom wall of the pot body 3 arches inward and is adapted to the plate body 20.

[0128] The cooking appliance 1 provided by this utility model includes the heating plate 2 proposed in any of the above embodiments, and therefore has all the beneficial effects of the heating plate 2.

[0129] In addition, the bottom wall of the pot body 3 arches inward and is adapted to the plate body 20. For example, when the heating plate 2 arches upward toward the surface of the pot body 3, the bottom wall of the pot body 3 arches inward, thereby adapting the heating plate 2 to the pot body 3 and reducing the gap between the heating plate 2 and the pot body 3.

[0130] In some embodiments, the outer bottom wall of the pot body 3 may optionally be an arc surface with a single radius of curvature.

[0131] In this embodiment, the outer bottom wall of the pot is an arc surface with a single radius of curvature to reduce the processing difficulty of the bottom wall of the pot and reduce manufacturing costs.

[0132] In some embodiments, optionally, the bottom wall of the pot body 3 facing the heating plate 2 includes a fourth arc surface 30 and a fifth arc surface 32, the fifth arc surface 32 surrounds the outside of the fourth arc surface 30 and is connected to the fourth arc surface 30, and the radius of curvature of the fifth arc surface 32 is greater than the radius of curvature of the fourth arc surface 30.

[0133] In this embodiment, the bottom surface of the pot body 3 includes a fourth arc surface 30 and a fifth arc surface 32 with different radii of curvature. The fifth arc surface 32 surrounds the fourth arc surface 30, and the radius of curvature of the fourth arc surface 30 is smaller than that of the fifth arc surface 32. This makes the fourth arc surface 30 steeper and the fifth arc surface 32 gentler. The steeper fourth arc surface 30 keeps it away from the heating plate 2, preventing the heating plate 2 from contacting the fourth arc surface 30 at the inner ring of the heating plate 2. The gentler fifth arc surface 32 maintains a certain gap between its outer edge and the heating plate 2, thus preventing the pot body 3 from contacting the heating plate 2 at its outer edge. This causes the contact position between the pot body 3 and the heating plate 2 to shift from the edge area in related technologies to the center of the arched portion, reducing the thickness of the air insulation layer between the central area of ​​the pot body 3 and the heating plate 2, reducing heat transfer resistance, improving the heat conduction efficiency to the cooking cavity, and thus improving the energy efficiency of the cooking appliance.

[0134] In some embodiments, optionally, the radius of curvature of the fourth arc surface 30 is smaller than the first radius of curvature, and the radius of curvature of the fifth arc surface 32 is larger than the second radius of curvature.

[0135] In this embodiment, the radius of curvature of the fourth arc surface 30 is smaller than that of the first arc surface 200, causing the fourth arc surface 30 to bend further away from the heating plate 2 compared to the first arc surface 200. This ensures that the fourth arc surface 30 will not contact the first arc surface 200 at the inner ring of the heating plate 2. The radius of curvature of the fifth arc surface 32 is larger than that of the second arc surface 202, ensuring that the outer edge of the fifth arc surface 32 will not contact the heating plate 2. This ensures that the contact position between the pot body 3 and the heating plate 2 is appropriate.

[0136] In some embodiments, the contact position between the pot body 3 and the heating plate 2 is optionally located near the outer edge of the first arc surface 200.

[0137] In this embodiment, the contact position between the pot body 3 and the heating plate 2 is set close to the outer edge of the first arc surface 200. This not only avoids affecting the detection results of the temperature controller 24 and ensures reliable control of the cooking process, but also reduces the size of the air layer between the contact position between the pot body 3 and the heating plate 2 and the middle of the heating plate 2, thereby reducing the thermal resistance between the heating plate 2 and the pot body 3 and improving the uniformity of the temperature field and the heat transfer efficiency within the pot body 3.

[0138] Optionally, in the orthographic projection along the vertical direction of the cooking appliance 1, the projection of the position where the pot body 3 contacts the heating plate 2 at least partially coincides with the projection of the heating tube 22.

[0139] In some embodiments, the cooking appliance 1 may optionally include any one of a rice cooker, an electric pressure cooker, and an electric slow cooker.

[0140] In this embodiment, the cooking appliance 1 can be any one of a rice cooker, an electric pressure cooker, and an electric slow cooker.

[0141] like Figures 1 to 10 As shown, according to some embodiments of this application, optionally, the surface of the heating plate 2 includes a first arc surface 200 and a second arc surface 202 with different radii of curvature. Meanwhile, a first reference line L1 (i.e., the outer edge of the first arc surface 200 or the inner edge of the second arc surface 202) serves as the boundary between the first arc surface 200 and the second arc surface 202. With the center of the heating plate 2 as the center, the inner circle of the circle containing the first reference line L1 is the first arc surface 200, and the outer circle of the circle containing the first reference line L1 is the second arc surface 202. The centers of the first arc surface 200 and the second arc surface 202 are located on the same side of the surface of the heating plate 2, and both the first arc surface 200 and the second arc surface 202 are convex upwards, that is, the centers of the first arc surface 200 and the second arc surface 202 are both located on the lower side of the surface of the heating plate 2.

[0142] The radius of curvature of the first arc surface 200 is the first radius of curvature, and the radius of curvature of the second arc surface 202 is the second radius of curvature (unit: mm). The first radius of curvature and the second radius of curvature are different in size and the difference is greater than or equal to 10 mm and less than or equal to 400 mm (optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm). At the same time, the first radius of curvature is greater than or equal to the second radius of curvature. The first radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm (optionally, the first radius of curvature is greater than or equal to 600 mm and less than or equal to 900 mm), and the second radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm (optionally, the second radius of curvature is greater than or equal to 550 mm and less than or equal to 750 mm).

[0143] The ratio of the first diameter D1 of the circle containing the outer edge of the first arc surface 200 to the diameter D4 of the disk body 20 is a first ratio, which is greater than or equal to 0.2 and less than or equal to 0.8 (optionally, the first ratio is greater than or equal to 0.4 and less than or equal to 0.8).

[0144] Optionally, the heating plate 2 includes a heating tube 22, which is set at the target position A. With the center of the plate body 20 as the center, the ratio of the second diameter D2 of the circle where the target position A is located to the diameter of the heating plate 2 is a second ratio. The second ratio is greater than or equal to 0.2 and less than or equal to 0.8 (optionally, the second ratio is greater than or equal to 0.4 and less than or equal to 0.8). The difference between the first ratio and the second ratio is less than or equal to 0.4, so that the first reference line L1 is set near the plate surface area above the heating tube 22.

[0145] Optionally, the heating power of the heating plate 2 includes at least the following power distribution types: first power (300W~450W), second power (450W~680W), and third power (680W~1200W).

[0146] Optionally, when the heating power of the heating plate 2 is a first power (300W~450W): the diameter of the heating plate 2 is greater than or equal to 100mm and less than or equal to 160mm (optionally, the diameter of the heating plate 2 is greater than or equal to 120mm and less than or equal to 140mm), the first radius of curvature is greater than or equal to 600mm and less than or equal to 900mm (optionally, the first radius of curvature is greater than or equal to 650mm and less than or equal to 850mm), the second radius of curvature is greater than or equal to 550mm and less than or equal to 750mm (optionally, the second radius of curvature is greater than or equal to 600mm and less than or equal to 650mm), and the first ratio is greater than or equal to 0.4 and less than or equal to 0.8 (optionally, the first ratio is greater than or equal to 0.5 and less than or equal to 0.8).

[0147] When the heating power of the heating plate 2 is the second power (450W~680W): the diameter of the heating plate 2 is greater than or equal to 120mm and less than or equal to 180mm (optionally, the diameter of the heating plate 2 is greater than or equal to 135mm and less than or equal to 165mm), the first radius of curvature is greater than or equal to 600mm and less than or equal to 900mm (optionally, the first radius of curvature is greater than or equal to 650mm and less than or equal to 800mm), the second radius of curvature is greater than or equal to 550mm and less than or equal to 750mm (optionally, the second radius of curvature is greater than or equal to 600mm and less than or equal to 700mm), and the first ratio is greater than or equal to 0.4 and less than or equal to 0.8 (optionally, the first ratio is greater than or equal to 0.5 and less than or equal to 0.8).

[0148] When the heating power of the heating plate 2 is the third power (680W~1200W): the diameter of the heating plate 2 is greater than or equal to 150mm and less than or equal to 220mm (optionally, the diameter of the heating plate 2 is greater than or equal to 160mm and less than or equal to 200mm), the first radius of curvature is greater than or equal to 600mm and less than or equal to 900mm (optionally, the first radius of curvature is greater than or equal to 650mm and less than or equal to 800mm), the second radius of curvature is greater than or equal to 550mm and less than or equal to 750mm (optionally, the second radius of curvature is greater than or equal to 600mm and less than or equal to 700mm), and the first ratio is greater than or equal to 0.4 and less than or equal to 0.8 (optionally, the first ratio is greater than or equal to 0.5 and less than or equal to 0.8).

[0149] The heating plate 2 also includes a third arc surface 204. Meanwhile, the third reference line L3 serves as the boundary between the second arc surface 202 and the third arc surface 204. The area between the first reference line L1 and the third reference line L3 is the second arc surface 202, and the outer circle of the circle containing the third reference line L3 is the third arc surface 204. The centers of the second arc surface 202 and the third arc surface 204 are both located on the lower side of the heating plate 2, or the center of the second arc surface 202 is located on the lower side of the heating plate 2, and the center of the third arc surface 204 is located on the upper side of the heating plate 2.

[0150] When the centers of the second arc surface 202 and the third arc surface 204 are located on the same side of the heating plate 2: the first radius of curvature and the second radius of curvature are different in size and the difference is greater than or equal to 10 mm and less than or equal to 400 mm (optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm); the second radius of curvature and the third radius of curvature are different in size and the difference is greater than or equal to 10 mm and less than or equal to 400 mm (optionally, the difference between the second radius of curvature and the third radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm). 0mm); First radius of curvature > Second radius of curvature > Third radius of curvature, the first radius of curvature is greater than or equal to 500mm and less than or equal to 900mm; the second radius of curvature is greater than or equal to 500mm and less than or equal to 900mm; the third radius of curvature is greater than or equal to 500mm and less than or equal to 900mm; with the center of the disk body 20 as the center, the ratio of the diameter of the circle containing the outer edge of the second arc surface 202 to the diameter of the heating disk 2 is the third ratio, the third ratio is greater than or equal to 0.2 and less than or equal to 1 (optionally, the third ratio is greater than or equal to 0.6 and less than 1).

[0151] Among them, the third ratio > the second ratio > the first ratio. The beneficial effect of the curvature radius relationship is as follows: When the bottom arched surface of the pot body 3 (e.g., the fourth arc surface 30) is a single curvature radius, and the matching second curvature radius is equal to the curvature radius of the bottom arched surface of the pot body 3, in order to ensure that the heating plate 2 effectively adheres to the pot body 3 in the area where the second arc surface 202 is located (the cast aluminum area that wraps the heating tube 22) and avoids the air layer thermal resistance caused by the gap in this area, which affects the heating performance and thermal efficiency, it is necessary to have a gap distance between the pot body 3 and the heating plate 2 corresponding to the first arc surface 200 and the third arc surface 204. Therefore, in the area corresponding to the first arc surface 200, the curvature radius of the pot body 3 should be < the curvature radius of the heating plate 2, and in the area corresponding to the third arc surface 204, the curvature radius of the pot body 3 should be > the curvature radius of the heating plate 2. So the curvature radius relationship needs to satisfy: first curvature radius > second curvature radius > third curvature radius.

[0152] When the centers of the second arc surface 202 and the third arc surface 204 are located on both sides of the heating plate 2: the first radius of curvature and the second radius of curvature are different in size and the difference is greater than or equal to 10 mm and less than or equal to 400 mm (optionally, the difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm), and the second radius of curvature and the third radius of curvature are different in size and the difference is greater than or equal to 10 mm (optionally, the difference between the second radius of curvature and the third radius of curvature is greater than or equal to 100 mm). The first radius of curvature is greater than the second radius of curvature and the third radius of curvature, wherein the first radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm, the second radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm, and the third radius of curvature is greater than or equal to 5 mm and less than or equal to 900 mm (optionally, the third radius of curvature is greater than or equal to 10 mm and less than or equal to 100 mm); the ratio of the third diameter D3 of the circle containing the outer edge of the third arc surface 204 to the diameter D4 of the disk body 20 is the third ratio, the third ratio is greater than or equal to 0.2 and less than or equal to 1 (optionally, the third ratio is greater than or equal to 0.6 and less than 1), and the third ratio is greater than the second ratio and the first ratio.

[0153] Optionally, the cooking appliance 1 also includes a heat insulation cover 6, with the pot body 3 and heating plate 2 located inside the heat insulation cover 6.

[0154] Optionally, the cooking appliance 1 also includes a pot body 4 and a lid 5, with the pot body 3, heating plate 2 and heat preservation cover 6 all disposed inside the pot body 4.

[0155] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0156] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0157] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heating plate for use in cooking appliances, characterized in that, The cooking appliance includes a pot body, and the heating plate is used to heat the pot body. The heating plate includes: The plate body has a surface facing the pot body that includes a first arc surface and a second arc surface. The first arc surface and the second arc surface are respectively arranged in a ring around the middle of the plate body. The second arc surface surrounds the outside of the first arc surface and is connected to the first arc surface. Both the first arc surface and the second arc surface are arched towards the side of the plate body closer to the pot body. The radius of curvature of the first arc surface is a first radius of curvature, and the radius of curvature of the second arc surface is a second radius of curvature. The first radius of curvature and the second radius of curvature are different. The temperature controller is located in the middle of the plate body; In a cross-section along the vertical direction of the cooking appliance, the line connecting the inner edge of the first arc surface and the outer edge of the second arc surface is the target reference line, and the connection point between the first arc surface and the second arc surface is located on the side of the target reference line closer to the pot body.

2. The heating plate according to claim 1, characterized in that, The first radius of curvature is greater than the second radius of curvature.

3. The heating plate according to claim 1, characterized in that, The heating plate also includes: A heating element is disposed on the plate body, and the heating element is located near the connection between the first arc surface and the second arc surface.

4. The heating plate according to claim 3, characterized in that, The plate body includes a target position along the vertical direction of the cooking appliance. The heating tube is positioned opposite the target position. With the center of the plate body as the center, the diameter of the circle containing the outer edge of the first arc surface is the first diameter, and the diameter of the circle containing the target position is the second diameter. The ratio of the first diameter to the diameter of the plate body is the first ratio, and the ratio of the second diameter to the diameter of the plate body is the second ratio. The difference between the first ratio and the second ratio is less than or equal to 0.

4.

5. The heating plate according to claim 4, characterized in that, The first ratio is greater than or equal to 0.2 and less than or equal to 0.8; and / or The second ratio is greater than or equal to 0.2 and less than or equal to 0.

8.

6. The heating plate according to claim 5, characterized in that, The first ratio is greater than or equal to 0.4 and less than or equal to 0.8; and / or The second ratio is greater than or equal to 0.4 and less than or equal to 0.

8.

7. The heating plate according to claim 1, characterized in that, The difference between the first radius of curvature and the second radius of curvature is greater than or equal to 10 mm and less than or equal to 400 mm; and / or The first radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm; and / or The second radius of curvature is greater than or equal to 400 mm and less than or equal to 900 mm.

8. The heating plate according to claim 7, characterized in that, The difference between the first radius of curvature and the second radius of curvature is greater than or equal to 50 mm and less than or equal to 350 mm; and / or The first radius of curvature is greater than or equal to 600 mm and less than or equal to 900 mm; and / or The second radius of curvature is greater than or equal to 550 mm and less than or equal to 750 mm.

9. The heating plate according to any one of claims 1 to 8, characterized in that, The surface of the pan facing the pot also includes: The third arc surface is arranged around the second arc surface and connected to the second arc surface. The third arc surface arches up on the side of the plate body close to the pot body or is recessed on the side away from the pot body. Wherein, the radius of curvature of the third arc surface is the third radius of curvature, and the second radius of curvature is greater than the third radius of curvature.

10. The heating plate according to claim 9, characterized in that, With the center of the disk body as the center, the diameter of the circle containing the inner edge of the third arc surface is the third diameter, and the ratio of the third diameter to the diameter of the disk body is the third ratio value; The third ratio is greater than or equal to 0.2 and less than or equal to 1.

11. The heating plate according to claim 10, characterized in that, The difference between the second radius of curvature and the third radius of curvature is greater than or equal to 10 mm and less than or equal to 400 mm.

12. The heating plate according to claim 11, characterized in that, The first radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or The second radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm; and / or The third radius of curvature is greater than or equal to 500 mm and less than or equal to 900 mm.

13. The heating plate according to claim 11, characterized in that, When the third arc surface is recessed on the side opposite to the pot body: The third radius of curvature is greater than or equal to 5 mm and less than or equal to 900 mm.

14. The heating plate according to any one of claims 1 to 8, characterized in that, When the heating power of the heating plate is greater than or equal to 300W and less than or equal to 450W: the diameter of the heating plate is greater than or equal to 100mm and less than or equal to 160mm; When the heating power of the heating plate is greater than or equal to 450W and less than or equal to 680W: the diameter of the heating plate is greater than or equal to 120mm and less than or equal to 180mm. When the heating power of the heating plate is greater than or equal to 680W and less than or equal to 1200W: the diameter of the heating plate is greater than or equal to 150mm and less than or equal to 220mm.

15. The heating plate according to any one of claims 1 to 8, characterized in that, The heating plate includes a first side and a second side disposed opposite to each other. The first arc surface and the second arc surface are both located on the first side and arched away from the second side. The second arc surface extends from the inner edge to the outer edge toward the second side.

16. A cooking utensil, characterized in that, include: Pot body; and The heating plate as described in any one of claims 1 to 15 is used to heat the pot body; The bottom wall of the pot body arches inwards and fits the plate body.

17. The cooking utensil according to claim 16, characterized in that, The bottom wall of the pot body facing the heating plate includes a fourth arc surface and a fifth arc surface. The fifth arc surface surrounds the outside of the fourth arc surface and is connected to the fourth arc surface. The radius of curvature of the fifth arc surface is greater than the radius of curvature of the fourth arc surface.

18. The cooking utensil according to claim 17, characterized in that, The radius of curvature of the fourth arc surface is smaller than the radius of curvature of the first arc surface, and the radius of curvature of the fifth arc surface is larger than the radius of curvature of the second arc surface.

19. The cooking utensil according to claim 16, characterized in that, The contact position between the pot body and the heating plate is located near the outer edge of the first arc surface.

20. The cooking utensil according to any one of claims 16 to 19, characterized in that, The cooking appliance includes any one of a rice cooker, an electric pressure cooker, and an electric slow cooker.

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