Electric kettle

Abstract

Provided in the present application is an electric kettle, which is provided with an inner container for containing liquid, the inner container comprising an inner container bottom, and an inner container body extending from the upper edge of the inner container bottom to an inner container opening, wherein the inner surface of the inner container bottom comprises a transverse surface located at the center of the bottom and an arc surface extending upwards around the transverse surface and protruding outwards; the inner container bottom is provided with a heating element at a position corresponding to the arc surface; the height of the arc surface is greater than the equivalent diameter of the transverse surface; and the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the arc surface ranges from 0.14 to 0.42.

Description

An electric kettle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 30, 2023, with application number 202311413617.1 and invention name “An Electric Kettle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of household appliances, and in particular to an electric kettle. Background Art

[0003] At present, the noise of electric kettles on the market when boiling water is a problem that users are more concerned about, especially for high-power electric kettles with a heating element (such as a heating tube) power of more than 1600W. The noise when boiling water can even reach 65-70 decibels, which greatly affects the user experience. In order to solve the problem of loud noise when the electric kettle boils water, there are some solutions in the prior art: one is to reduce the boiling power of the electric kettle. The noise reduction principle of this method is to reduce the bubble bursting noise by reducing the bubble generation speed when boiling water, but this solution prolongs the boiling time. Although increasing the heating power can increase the heating speed, it will cause the noise to increase. Therefore, it is difficult to balance between high-speed heating and noise reduction. The second solution is to add a coating to the inner surface of the liner, and suppress the bubble generation speed through the coating, thereby achieving the purpose of reducing noise. The disadvantage of this solution is that it increases the production cost and the coating falls off, which easily leads to food safety problems. The third solution is to optimize the bottom wall structure of the inner pot, set a slope or curved surface on the bottom wall of the inner pot, and set the heating element on the slope or curved surface. The noise reduction principle of this method is that the bubbles generated on the slope or curved surface during the heating process will slide along the slope or curved surface. During the sliding process, small bubbles will converge into large bubbles, thereby reducing the frequency of bubble bursting, thereby achieving the purpose of reducing the noise of boiling water. However, in this solution, since the range of the curved surface of the inner pot on the bottom wall of the inner pot is relatively large, the surface area of ​​the bottom wall of the inner pot will become very large, that is, when the heating element is working, the area of ​​heat dissipation on the outside of the bottom wall of the inner pot will also become very large, which will affect the boiling speed of the electric kettle, and ultimately cause the heating speed of the electric kettle to become lower, which obviously also affects the user experience.

[0004] Therefore, how to reduce the noise of boiling water while ensuring food safety and without affecting the heating speed is a problem that technicians in this field need to solve.

[0005] Summary of the Invention

[0006] In order to solve the problem in the prior art that a curved surface is provided on the bottom of the electric kettle inner tank to solve the heating noise of the electric kettle, but the heating noise and heating speed are not taken into account at the same time, especially for high-power electric kettles, the present application can take into account both low heating noise and high heating speed through a reasonable design of the electric kettle inner tank structure.

[0007] The present application is achieved in the following manner: The present application provides an electric kettle, comprising an inner liner for holding liquid, the inner liner comprising an inner liner bottom and an inner liner body extending from the upper edge of the inner liner bottom to the inner liner opening, the inner surface of the inner liner bottom comprising a transverse surface located at the center of the bottom and an arc-shaped surface extending upward and outwardly convex around the transverse surface, the inner liner bottom being provided with a heating element at a position corresponding to the arc-shaped surface, the height of the arc-shaped surface being greater than the equivalent diameter of the transverse surface, and the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the arc-shaped surface being 0.14-0.42.

[0008] After adopting the above technical scheme, the present application has the following advantages: the bottom of the inner pot of the electric kettle of the present application has a central transverse surface and an arc-shaped surface extending upward and convexly around the transverse surface. The bottom of the inner pot is provided with a heating element at a position corresponding to the arc-shaped surface. By providing an outward-convex arc-shaped surface at the bottom of the inner pot and providing a heating element on the outside of the arc-shaped surface, the temperature at the arc-shaped surface is higher, and it is easier to generate bubbles on the arc-shaped surface. When the bubbles move along the arc-shaped surface, small bubbles will converge into large bubbles, increasing the volume of the bubbles and reducing the frequency of bubble rupture, which can effectively reduce the noise generated when the electric kettle boils water; at the same time, the present application controls the ratio of the equivalent diameter of the central transverse surface of the inner surface of the inner pot to the upper edge of the arc-shaped surface between 0.14-0.42. By reasonably designing the size of the central transverse surface, the heating speed can be taken into account while reducing noise, ensuring that the electric kettle has low noise and fast boiling speed, satisfying the user experience.

[0009] The specific reason is that when the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the curved surface is large (greater than 0.42), the area of ​​the curved surface is relatively small, the area of ​​the transverse surface is relatively large, and the area of ​​the outer side of the bottom wall of the inner pot for heat dissipation is relatively small. Although the electric kettle can achieve a faster heating speed, the heat conducted by the heating element to the curved surface can be quickly transferred to the transverse surface, and the probability of bubble generation on the transverse surface increases at the same time. Moreover, since the area of ​​the curved surface is relatively small, it is not easy to form large bubbles, and the noise reduction effect is poor. Even if the heating speed is fast at this time, the user experience is not good. When the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the curved surface is very small (less than 0.14), the area of ​​the transverse surface is small, the area of ​​the curved surface is large, and the area of ​​the outer side of the bottom wall of the inner pot for heat dissipation is relatively large, which will aggravate the heat dissipation of the heating element during the heating process, resulting in a slower heating speed. Although the area of ​​the curved surface is relatively large at this time, a better noise reduction effect can be achieved, the user experience is also not good. Therefore, only when the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the curved surface is moderate (0.14-0.42), it can not only meet the area of ​​heat dissipation on the outer side of the bottom wall of the inner tank without affecting the heating speed of the heating element, but also make bubbles tend to form on the curved surface and easily gather into large bubbles, which can effectively reduce noise, and thus take into account the heating noise and heating speed when the electric kettle is working. When the size and height of the upper edge of the curved surface of the inner tank are certain, the above effect can be better verified. In particular, when the height of the curved surface is greater than the equivalent diameter of the transverse surface, under the premise that the equivalent diameter of the transverse surface and the equivalent diameter of the upper edge of the curved surface remain unchanged: increasing the height of the curved surface can make the curved surface steeper on the one hand, and the bubbles generated on the curved surface can more easily slide along the curved surface and merge into large bubbles, reducing the noise generated by the bubble bursting. On the other hand, the height of the curved surface is greater than the equivalent diameter of the transverse surface, which can ensure that the area of ​​the curved surface is larger than the area of ​​the transverse surface, ensuring that the probability of bubbles generated on the curved surface is higher, further achieving the technical effect of reducing noise.

[0010] As a preferred embodiment, the power of the heating element is no less than 1500W; or, the ratio of the power of the heating element to the maximum water boiling capacity of the electric kettle is no less than 1000W / L. For electric kettles with relatively high heating element power, or for electric kettles with relatively high heating element power per unit volume, the technical solution of this application can better achieve a balance between heating speed and noise reduction.

[0011] As a preferred embodiment, the vertical distance from the bottom edge of the heating element to the transverse surface is 0.05-0.4 times the height of the curved surface. With this solution, while the curved and transverse surfaces remain unchanged, properly positioning the heating element can further reduce the noise level of the kettle. In this embodiment, the ratio of the vertical distance from the bottom edge of the heating element to the transverse surface to the height of the curved surface is maintained between 0.05-0.4. When the setting height of the lower edge of the heating element is too low, and the ratio of the distance from the lower edge of the heating element to the transverse surface to the height of the curved surface is less than 0.05, the heat generated by the heating element can be quickly transferred to the transverse surface, and the speed of bubble generation on the transverse surface increases, which easily leads to an increase in noise; as the setting height of the lower edge of the heating element is increased, the noise when the electric kettle boils water will be greatly improved when the ratio of the distance from the lower edge of the heating element to the transverse surface to the height of the curved surface is increased; but when the ratio of the distance from the lower edge of the heating element to the transverse surface to the height of the curved surface is greater than 0.4, since the lower edge of the heating element is relatively far away from the transverse surface, the reduction in noise when the electric kettle boils water is already very limited, or even no longer reduces, and there is no need to further increase the height of the heating element, especially when an outer shell is provided outside the inner tank of the electric kettle, the height of the heating tube is relatively large, and it is also easy to affect the installation of the outer shell.

[0012] As a preferred embodiment, the transverse surface is a circular transverse surface. In the aforementioned solution, the transverse surface is preferably a circular transverse surface. The circular transverse surface can ensure that the distance between the heating element and the edge of the circular transverse surface is equal, the temperature on the circular transverse surface is relatively balanced, and the convection of the water flow on the circular transverse surface can be reduced, which reduces the speed of bubble separation on the circular transverse surface, thereby achieving the purpose of reducing noise.

[0013] As a preferred embodiment, the equivalent diameter of the curved surface gradually increases from bottom to top. As the equivalent diameter of the curved surface gradually increases, bubbles generated on the curved surface can slide along the curved surface to form large bubbles, reducing the speed of bubble bursting, reducing the formation of noise, and achieving a noise reduction effect.

[0014] As a preferred embodiment, the inner liner body is cylindrical, and the upper edge of the curved surface is tangentially connected to the lower edge of the inner liner body. The inner liner body preferably adopts a cylindrical structure, such as a straight cylinder or a tapered cylinder (for example, a tapered cylinder with a larger bottom and a smaller top). This is convenient for the production of the inner liner body and also for the connection between the inner liner body and the curved surface. In particular, when the upper edge of the curved surface is tangentially connected to the lower edge of the inner liner body, a continuous shape is formed between the inner liner body and the curved surface, which makes cleaning after use easier and improves the user experience.

[0015] As a preferred embodiment, the inner liner body includes a second inner liner body and a first inner liner body integrally formed with the upper edge of the curved surface, and the first inner liner body and the second inner liner body are connected by welding. In this way, the structure of integrally forming a portion of the inner liner body with the curved surface facilitates simultaneous connection of the curved surface and the transverse surface to the inner liner body during formation. Furthermore, the connection method of the inner liner body is simplified, the process difficulty is reduced, and it is conducive to industrialized manufacturing.

[0016] As a preferred embodiment, the inner liner includes a stainless steel inner liner body and an aluminum heat conductor attached to the outer side of the lower side of the inner liner body, the heating element is arranged on the outer wall of the aluminum heat conductor, and the upper edge of the aluminum heat conductor is lower than the upper edge of the arc surface. Using the above scheme, an aluminum heat conductor is arranged on the outer side of the inner liner, and a heating element is arranged on the outer wall of the aluminum heat conductor. The heat generated by the heating element is evenly transferred to the inner surface of the bottom of the inner liner through the aluminum heat conductor, which can avoid the vibration of the inner liner caused by local excessive temperature and slow down the detachment speed of the bubbles. In addition, the thermostat is generally installed on the aluminum heat conductor corresponding to the horizontal surface. If the aluminum heat conductor is set too high, the heat generated by the heating element is easily transmitted to the surroundings through the aluminum heat conductor, and the heat transferred to the thermostat is less. The thermostat is not easy to trip, which can easily lead to the problem that the electric kettle cannot trip in time when it is dry-burned, affecting the safety performance of the product.

[0017] As a preferred embodiment, the inner liner is made of a composite plate comprising a stainless steel layer and an aluminum layer. The stainless steel layer forms the inner liner body, and the aluminum layer forms the aluminum heat conductor. This solution, in which the inner liner is composed of a composite plate comprising an inner stainless steel layer and an outer aluminum layer, and the aluminum heat conductor is formed by the aluminum layer, effectively avoids the problem of slow heating speed caused by a loose weld between the aluminum heat conductor and the inner liner body, significantly improving the kettle's boiling speed.

[0018] As a preferred embodiment, the outer wall of the aluminum heat conductor includes a horizontal wall and an arc-shaped wall surrounding the horizontal wall, the heating element is arranged around the arc-shaped wall, a thermostat is mounted on the horizontal wall, and the temperature sensing element of the thermostat is offset relative to the center of the inner pot. In the text, "horizontal" and "transverse" refer to the same direction, that is, the direction perpendicular to the height direction of the electric kettle. With the above scheme, the temperature sensing element of the thermostat is offset relative to the center of the inner pot, and the temperature sensing element of the thermostat can be closer to the heating element. When the electric kettle is dry-boiled, the thermostat can respond quickly and promptly, and promptly control the power off of the heating element to avoid safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] FIG1 is a schematic structural diagram of an electric kettle of the present application;

[0021] FIG2 is a schematic structural diagram of the inner container of the electric kettle of the present application;

[0022] FIG3 is a schematic diagram of the assembly of the inner container of the electric kettle of the present application;

[0023] FIG4 is a diagram of noise and heating rate at different equivalent diameter ratios of Example 1 of the present application;

[0024] FIG5 is a graph showing noise and heating rate at different equivalent diameter ratios according to Example 2 of the present application;

[0025] FIG6 is a graph showing noise and heating rate at different equivalent diameter ratios according to Example 3 of the present application;

[0026] FIG7 is a diagram showing noise and heating rate at different equivalent diameter ratios according to the fourth embodiment of the present application.

[0027] Figure numerals: 1. outer shell; 11. handle; 2. inner liner; 201. inner liner bottom; 202. inner liner body; 2021. second inner liner body; 2022. first inner liner body; 21. inner liner body; 211. curved surface; 212. transverse surface; 22. aluminum heat conductor; 221. curved wall; 222. horizontal wall; 3. heating element. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0030] In addition, in the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "lateral", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0031] Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0032] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0034] Electric kettles in the prior art generally include a kettle body and a base. The kettle body is provided with a handle, an upper coupler is provided at the bottom of the kettle body, and a lower coupler is provided on the base. When the kettle body is placed on the base, the upper and lower couplers couple to each other to power the kettle body. The kettle body generally includes an outer shell and an inner liner disposed within the outer shell. The outer wall of the inner liner is provided with a heater, which heats the inner liner, which contains water, thereby heating the water in the inner liner. Of course, there are also electric kettles in the prior art with an integrated base and kettle body. In this type of kettle, the power cord is directly connected to the kettle body, eliminating the need for a base and resulting in lower costs.

[0035] Currently, electric kettles on the market generate a large number of bubbles on the inner surface of the kettle when boiling water. This is particularly noticeable at high power levels. The noise produced by the bubbles bursting is loud, reaching up to 70 decibels, significantly impacting the user experience. While prior art methods have disclosed methods for suppressing noise by providing a central plane and curved surfaces surrounding the central plane on the inner surface of the kettle, these methods only consider the effect of the central plane's size on noise, ignoring its influence on the heating speed of the kettle. Consequently, they fail to balance heating speed with noise reduction.

[0036] For example, the applicant disclosed a liquid heater in Chinese patent application CN202222997552.7, and the specific scheme for achieving noise reduction is as follows: the inner surface of the bottom wall of the inner tank includes a spherical surface, and the heating element is arranged on the spherical surface. The buoyancy of the bubbles and the viscosity of the slope surface are used to make the bubbles slide from bottom to top along the slope surface, thereby making the small bubbles on the slope surface merge into large bubbles, reducing the small bubbles from breaking off from the bottom wall of the pot into the water, and large bubbles are more difficult to break in the water after breaking off from the bottom wall of the pot, thereby solving the problem of small and dense bubbles in the local area and achieving a significant noise reduction effect. The applicant also disclosed in Chinese patent application CN201120307947.9 that the cup body (inner tank) of the soymilk maker is made into a spherical form. In other prior arts, for example, Chinese patent application CN201420057680.6 discloses an inner liner of a soymilk maker, wherein the inner liner is composed of a metal barrel and a cup body assembly, and the cross-section of the bottom of the cup body assembly is a trapezoidal structure that is narrow at the bottom and wide at the top, and the angle between the hypotenuse and the bottom of the trapezoid is 5-60°, and the heating element is arranged on the hypotenuse. The structure of the above patent may achieve a certain degree of noise reduction. However, in the above prior art, since the range of the arc-shaped surface (spherical surface) of the inner liner is relatively large on the bottom wall of the inner liner, the surface area of ​​the bottom wall of the inner liner will become very large, that is, during the operation of the heating element, the area of ​​heat dissipation on the outside of the bottom wall of the inner liner will also become very large, which will affect the water boiling speed of the electric kettle, and ultimately cause the heating speed of the electric kettle to become lower, which obviously also affects the user experience.

[0037] Chinese patent application CN201020559732.1 discloses a soymilk maker cup (liner), the bottom of which consists of an arcuate surface and a central circular flat surface. The electric heating element is disposed on the arcuate surface, with the circular flat surface occupying a significant proportion (over 50%) of the entire cup bottom (lateral dimension). It is understood that, given the same upper edge dimensions of the arcuate surface (arc / spherical surface), the outer surface area of ​​the cup bottom in this application is significantly smaller than that of the prior art, where the inner liner arcuate surface (spherical surface) is disposed over a larger area on the inner liner bottom wall. This reduces the area of ​​heat dissipation on the outer side of the cup bottom. However, it is understood that, because the central circular flat surface occupies a significant proportion of the entire cup bottom, the proportion of the arcuate surface decreases accordingly, given the same upper edge dimensions of the arcuate surface. Even if the heating element is disposed on the arcuate surface, the thermal conductivity of the bottom wall can easily form small bubbles on the central circular flat surface. These small bubbles formed on the central circular flat surface are difficult to slide and merge into larger bubbles, and their rupture can easily produce a loud noise. In some prior art electric kettles, it is even believed that it is more preferable if the circular plane occupies a larger proportion of the entire kettle bottom wall than 80%. This obviously ignores other factors that may cause noise in the process of solving the noise problem.

[0038] Therefore, for electric kettles, the ratio of the central circular plane to the entire bottom wall, as well as the relationship between the central circular plane and the arc surface, have opposing effects on the heating noise and heating speed of the kettle. Existing technologies often focus solely on analyzing the impact of heating noise on electric kettles, with little attention paid to heating speed, let alone balancing these two factors. This is especially true for high-power kettles, where balancing high-speed heating and noise reduction is difficult.

[0039] In order to solve the problem that electric kettles in the prior art are not compatible with efficient heating and noise reduction, the present application provides an electric kettle, as shown in Figures 1-3, the electric kettle of the present application has an outer shell 1 and an inner liner 2 for holding liquid, the outer shell 1 is provided with a handle 11, the inner liner 2 includes an inner liner bottom 201 and an inner liner body 202 extending from the upper edge of the inner liner bottom 201 to the opening of the inner liner 2, the inner surface of the inner liner bottom 201 includes a transverse surface 212 located in the center and an arc-shaped surface 211 extending upward and outwardly convex around the transverse surface 212, the heating element 3 is arranged on the outer side of the inner liner 2 corresponding to the arc-shaped surface 211, the heating element 3 is an annular heating tube, the heating tube surrounds the outer side of the arc-shaped surface 211, the height H of the arc-shaped surface 211 is greater than the equivalent diameter D1 of the transverse surface 212, and the ratio of the equivalent diameter D1 of the transverse surface 212 to the equivalent diameter D of the upper edge of the arc-shaped surface 211 is 0.14-0.42. It is understood that the equivalent diameter of the transverse surface 212 is the diameter of a circle with the same area as the transverse surface 212, and the equivalent diameter of the upper edge of the arcuate surface 211 is the diameter of a circle with the same area as the area enclosed by the upper edge of the arcuate surface 211 (specifically, this can be obtained by projecting the upper edge of the arcuate surface 211 onto a horizontal plane and calculating the area of ​​the projected area). In addition, preferably, the height of the inner liner 202 is greater than the height of the arcuate surface 211. When the volume of the inner liner is the same, a taller inner liner can ensure that the electric kettle has a slender and beautiful appearance.

[0040] In the present application, the outer shell 1 includes a bottom shell covering the bottom of the inner liner 2 and a side shell surrounding the side of the inner liner 2. The bottom shell and the side shell can be formed as one piece or can be set separately. Specifically, the periphery of the bottom shell can extend to the side of the inner liner 2 and be connected to the lower edge of the side shell, or the lower edge of the side shell can extend to the bottom of the inner liner 2 and be connected to the periphery of the bottom shell, or the lower edge of the side shell can be vertically connected to the periphery of the bottom shell.

[0041] The shell 1 of the present application is wrapped around the outside of the inner liner 2. Specifically, there are the following schemes: Scheme 1: The upper edge of the shell 1 extends to the upper edge of the inner liner 2, and the inner liner 2 is completely placed in the space surrounded by the shell 1. The inner liner bottom 201 and the inner liner body 202 are completely wrapped by the shell. Such a setting of the electric kettle has a good heat preservation effect; Scheme 2: The upper edge of the shell 1 extends to between the upper edge of the inner liner bottom 201 and the upper edge of the inner liner body 202, that is, the shell 1 completely wraps the inner liner bottom 201 and partially wraps the inner liner body 202. With such a setting, the inner liner body 202 can be made of glass, and the user can see from the inner liner body 202 that the inner liner bottom 201 is not covered. The portion covered by the outer shell allows users to observe the boiling water status, improving the user experience. Option 3: The upper edge of the outer shell 1 extends to the upper edge of the inner pot bottom 201, that is, the outer shell 1 completely covers the inner pot bottom 201, and the inner pot body 202 is exposed. This provides a better visual experience than the electric kettle in Option 2. Option 4: The upper edge of the outer shell 1 extends below the upper edge of the inner pot bottom 201, that is, the inner pot bottom 201 is partially covered by the outer shell 1, and the inner pot bottom 201 is partially placed in the space formed by the outer shell 1. The outer shell 1 covers the area above the heating element 3 of the inner pot bottom 201. This option also provides a good visual experience. Among them, the outer shell 1 of Options 1, 2, and 3 all completely covers the inner pot bottom 201, and the outer shell 1 of Option 4 partially covers the inner pot bottom 201.

[0042] The present application can reduce noise while taking into account the heating speed by reasonably designing the size of the central transverse surface 212, ensuring that the electric kettle has a low noise and a fast water boiling speed, satisfying the user's experience. The specific reason is that when the ratio of the equivalent diameter of the transverse surface 212 to the equivalent diameter of the upper edge of the curved surface 211 is large (greater than 0.42), the area of ​​the curved surface 211 is relatively small, the area of ​​the transverse surface 212 is relatively large, and the area of ​​the outer side of the bottom wall of the inner liner 2 for heat dissipation is relatively small. Although the electric kettle can achieve a faster heating speed, the heat conducted by the heating element 3 to the curved surface 211 can be quickly transferred to the transverse surface 212, and the probability of bubble generation on the transverse surface 212 is increased at the same time. Moreover, since the area of ​​the curved surface 211 is relatively small, it is not easy to form large bubbles, and the noise reduction effect is poor. Even if the heating speed is fast at this time, the user experience is not good. When the ratio of the equivalent diameter of the transverse surface 212 to the equivalent diameter of the upper edge of the curved surface 211 is very small (<0.14), the area of ​​the transverse surface 212 is small, the area of ​​the curved surface 211 is large, and the area of ​​the heat dissipation outside the bottom wall of the inner liner 2 is relatively large, which will aggravate the heat dissipation during the heating process of the heating element 3, resulting in a slower heating speed. Although the area of ​​the curved surface 211 is relatively large at this time, a better noise reduction effect can be obtained, the user experience is also not good. Therefore, only when the ratio of the equivalent diameter of the transverse surface 212 to the equivalent diameter of the upper edge of the curved surface 211 is moderate (0.14-0.42), it can not only meet the requirement that the heat dissipation area outside the bottom wall of the inner liner 2 does not affect the heating speed of the heating element 3, but also make bubbles tend to form on the curved surface 211 and easily gather into large bubbles, which can effectively reduce noise, thereby taking into account both the heating noise and heating speed when the electric kettle is working. When the size and height of the upper edge of the curved surface 211 of the inner liner 2 are constant, the above effect can be better verified. Especially when the height of the curved surface 211 is greater than the equivalent diameter of the transverse surface 212, under the premise that the equivalent diameter of the transverse surface 212 and the equivalent diameter of the upper edge of the curved surface 211 remain unchanged: increasing the height of the curved surface 211 can, on the one hand, make the curved surface 211 steeper, and the bubbles generated on the curved surface 211 can more easily slide along the curved surface 211 and merge into large bubbles, thereby reducing the noise generated by the bubble bursting; on the other hand, the height of the curved surface 211 being greater than the equivalent diameter of the transverse surface 212 can ensure that the area of ​​the curved surface 211 is larger than the area of ​​the transverse surface 212, thereby ensuring that the probability of bubbles being generated on the curved surface 211 is higher, thereby further achieving the technical effect of reducing noise.

[0043] In this application, the inner pot 2 of the electric kettle includes a stainless steel inner pot body 21 and an aluminum heat conductor 22 attached to the outside of the inner pot body 21. The outer side of the aluminum heat conductor 22 is provided with a heater 3. The inner pot body 21 can be formed by stretching or stamping a stainless steel plate, with the aluminum heat conductor 22 welded to the outer side of the inner pot body 21. The inner pot body 21 can also be formed by stretching or stamping a composite plate, with the composite plate including an inner stainless steel layer and an outer aluminum layer, with the stainless steel layer forming the inner pot body 21 and the aluminum layer forming the aluminum heat conductor 22.

[0044] In a preferred embodiment of the present application, the inner liner 2 of the electric kettle can include a stainless steel inner liner body 21 and an aluminum heat conductor 22 welded to the outside of the bottom of the inner liner body 21, and a heating element 3 is welded to the periphery of the aluminum heat conductor 22. The inner liner body 21 is formed by stretching or stamping a stainless steel plate. The bottom of the inner liner body 21 and the aluminum heat conductor 22 together constitute the inner liner bottom 201. The transverse surface 212 and the arc surface 211 are arranged on the inner surface of the bottom of the inner liner body 21, and the part of the inner liner body 21 located on the upper edge of the arc surface 211 constitutes the inner liner body 202.

[0045] Specifically, the aluminum heat conductor 22 has a horizontal wall 222 and a curved wall 221. The horizontal wall 222 is arranged below the transverse surface 212, and the curved wall 221 surrounds the outside of the curved surface 211. The heating element 3 is a C-shaped heating tube, and the heating element 3 is arranged around the curved wall 221. A thermostat is provided on the horizontal wall 222. The temperature sensing element of the thermostat is offset relative to the center of the inner tank 2, that is, the center line of the inner tank 2 does not pass through the temperature sensing element of the thermostat. With such an arrangement, the temperature sensing element of the thermostat is offset relative to the center of the inner tank 2, and the temperature sensing element of the thermostat can be closer to the heating element 3. When the electric kettle dry-burns, the thermostat can respond promptly and quickly, and promptly control the heating element 3 to cut off power, thereby avoiding safety hazards.

[0046] In order to further reduce noise, preferably, the upper edge of the aluminum heat conductor 22 is lower than the upper edge of the curved surface 211, and the heating element 3 is fixed around the outer wall of the aluminum heat conductor 22 opposite to the curved surface 211. With this arrangement, the heat generated by the heating element 3 is evenly transferred to the inner surface of the bottom of the inner pot 2 through the aluminum heat conductor 22, which can avoid the vibration of the inner pot 2 caused by local excessive temperature and slow down the detachment speed of the bubbles; in addition, the thermostat is generally installed on the aluminum heat conductor 22 corresponding to the transverse surface 212. If the aluminum heat conductor 22 is set too high, the heat generated by the heating element 3 is easily transmitted to the surroundings through the aluminum heat conductor 22, and less heat is transferred to the thermostat, making it less likely to trip. This can easily lead to the problem of not being able to trip in time when the electric kettle is dry-boiling, affecting the safety performance of the product.

[0047] In addition, the inner liner body 202 is preferably cylindrical, and the upper edge of the curved surface 211 is tangentially connected to the lower edge of the inner liner body 202. The inner liner body 202 preferably adopts a cylindrical structure, such as a straight cylinder, or a conical cylinder (such as a conical cylinder with a larger bottom and a smaller top). This is beneficial to the production of the inner liner body 202, and is also beneficial to the connection between the inner liner body 202 and the curved surface 211; especially when the upper edge of the curved surface 211 is tangentially connected to the lower edge of the inner liner body 202, a continuous shape will be formed between the inner liner body 202 and the curved surface 211, and cleaning after use will become very easy, thereby improving the user experience. The inner liner body 202 includes a second inner liner body 2021 and a first inner liner body 2022 integrally formed with the upper edge of the curved surface 211. The first inner liner body 2022 and the second inner liner body 2021 are welded together. In this way, a part of the inner liner body 202 and the curved surface 211 are set to an integrally formed structure. On the one hand, it is convenient for the curved surface 211 and the transverse surface 212 to be connected to the inner liner body 202 at the same time as they are formed. On the other hand, the connection method of the inner liner body 202 will be simpler, the process difficulty will be reduced, and it will be conducive to industrial manufacturing.

[0048] In another preferred embodiment of the present application, the inner kettle 2 is made of a composite plate comprising a stainless steel layer and an aluminum layer. The stainless steel layer forms the inner kettle body 21, and the aluminum layer forms the aluminum heat conductor 22. This arrangement, in which the aluminum heat conductor 22 is formed from an aluminum layer, effectively avoids the problem of slow heating speed caused by a loose weld between the aluminum heat conductor 22 and the inner kettle body 21, significantly improving the kettle's boiling speed.

[0049] In the present application, the heating element 3 is preferably a C-shaped heating tube, and the heating element 3 has a notch. The projection of the temperature sensing element of the thermostat on the horizontal plane is located outside the projection of the horizontal plane in the area formed by the center of the inner pot bottom 201 and the line connecting the two ends of the notch. By adopting the above-mentioned scheme, the temperature sensing element of the thermostat is set at a position corresponding to the cold zone of the heating element 3, which can ensure that the thermostat can sense the temperature in time and avoid safety hazards caused by failure to trip in time. It can be understood that the heating element 3 can also be a multi-layer spiral heating tube arranged around the outside of the arc surface 211, and the heating element 3 can also be a plurality of split heating tubes evenly distributed around the periphery of the arc surface 211. In addition, the present application is particularly intended to solve the problem of balancing high-speed heating and noise reduction for high-power electric kettles with a power of not less than 1500W or a ratio of the power of the heating element 3 to the maximum water boiling capacity of the electric kettle of not less than 1000W / L. Of course, the technical solution of the present application is also applicable to electric kettles having a heating element 3 power of less than 1500W or a ratio of the heating element 3 power to the maximum water boiling capacity of less than 1000W / L. It will be understood that for electric kettles with a maximum water level, the maximum water boiling capacity is the capacity calibrated by the maximum water level. For electric kettles with automatic water filling, the maximum water boiling capacity may be the machine's preset maximum water boiling capacity or a selectable maximum water boiling capacity.

[0050] In addition, in the present application, a minimum water level mark is provided on the inner surface of the inner pot 2, and the minimum water level mark is higher than the upper edge of the curved surface 211. The minimum water level mark is also the minimum water capacity allowed when the electric kettle is boiling water. The volume of the area enclosed by the transverse surface 212 and the curved surface 211 is also the volume of the inner pot bottom 201 of the electric kettle. Designing the upper edge of the curved surface 211 to be lower than the minimum water level mark ensures that the curved surface 211 is always in contact with the water when the user boils water, avoiding the situation where the water level is too low, resulting in the upper end of the curved surface 211 being exposed to the air while the lower end is immersed in water, resulting in a large temperature difference between the upper and lower ends of the curved surface 211, causing the curved surface 211 to vibrate and cause bubbles to escape.

[0051] In addition, in order to further reduce the noise when the electric kettle is boiling water, in the present application, the vertical distance H1 from the lower edge of the heating element 3 to the transverse surface 212 is preferably 0.05-0.4 times the height H of the curved surface 211. It can be understood that the height of the lower edge of the heating element 3 refers to the distance between the lowest point where the heating element 3 contacts the inner pot 2 and the lowest point of the transverse surface 212. When the setting height of the lower edge of the heating element 3 is too low, and the ratio of the distance from the lower edge of the heating element 3 to the transverse surface 212 to the height of the curved surface 211 is less than 0.05, the heat generated by the heating element 3 can be quickly transferred to the transverse surface 212, and the speed of generating bubbles on the transverse surface 212 increases, which easily leads to an increase in noise; as the setting height of the lower edge of the heating element 3 is increased, the distance from the lower edge of the heating element 3 to the transverse surface 212 increases. 2 to the height of the curved surface 211, the noise level when boiling water in the electric kettle will be better improved; however, when the ratio of the distance from the lower edge of the heating element 3 to the transverse surface 212 to the height of the curved surface 211 is greater than 0.4, since the lower edge of the heating element 3 is already relatively far away from the transverse surface 212, the reduction in noise level when boiling water in the electric kettle is very limited, or even no longer reduced, and there is no need to further increase the height of the heating element 3. In particular, when the outer shell 1 is provided outside the inner shell 2 of the electric kettle, the height of the heating tube is relatively large and easily affects the installation of the outer shell 1. When the vertical distance from the lower edge of the heating element 3 to the transverse surface 212 is selected to be 0.05-0.4 times the height of the curved surface 211, the noise level when boiling water can be reduced to a certain extent.

[0052] In the present application, the transverse surface 212 is preferably a horizontally extending circular plane. The circular transverse surface 212 can ensure that the distance between the heating element 3 and the edge of the transverse surface 212 is equal, the temperature on the transverse surface 212 is relatively balanced, and the convection of the water flow on the transverse surface 212 can be reduced, and the speed of the bubble separation on the transverse surface 212 can be reduced, thereby achieving the purpose of reducing noise. It is understood that the transverse surface 212 is a transversely extending plane. The plane can be a smooth plane, or the plane can be provided with protrusions or patterns. The transverse surface 212 can also be a plane with a small inclination angle to the horizontal plane, such as a plane inclined at 5° to the horizontal plane. Of course, the transverse surface 212 can also be a surface with a certain height fluctuation as a whole, such as an undulating surface with a height difference of 2 mm between the highest point and the lowest point. Other embodiments of the transverse surface 212 should also be within the scope of protection of this application if they meet the spirit of this application. In addition, the shape of the transverse surface 212 can be circular, elliptical, rounded rectangular, etc., which will not be repeated here.

[0053] In the present application, the arcuate surface 211 is preferably a curved surface formed by an arc revolving around the edge of the transverse surface 212. The equivalent diameter of the arcuate surface 211 preferably increases gradually from bottom to top, that is, the width of the arcuate surface 211 gradually increases. This configuration allows bubbles generated at any position on the arcuate surface 211 during the water boiling process to slide along the arcuate surface 211, causing small bubbles to converge into larger bubbles and reducing the noise generated when the bubbles burst. It is understood that the arcuate surface 211 can be a spherical surface, an ellipsoidal surface, or another curved surface.

[0054] It can be understood that the equivalent diameter ratio of the transverse surface 212 of the inner pot 2 of the electric kettle of the present application to the upper edge of the curved surface 211 is between 0.14-0.42, specifically, it can be 0.14, 0.20, 0.25, 0.3, 0.35, 0.4, 0.42, etc.

[0055] It can be understood that the vertical distance from the lower edge of the heating element 3 of the electric kettle of the present application to the horizontal surface 212 is 0.05-0.4 times the height of the arc surface 211. Specifically, it can be 0.05, 0.1, 0.2, 0.25, 0.3, 0.35, 0.4, etc.

[0056] It is understood that the electric kettle of the present application can be an electric kettle with an integrated kettle body and base, or an electric kettle with a separate kettle body and base. In the case of a separate electric kettle, the inner pot 2, outer shell 1, heating element 3 and other components are arranged on the kettle body. The electric kettle of the present application is an electric kettle in a broad sense. In addition to having the function of boiling water, it can also heat beverages.

[0057] It can be understood that the inner bottom 201 and the inner body 202 of the electric kettle of the present application can be formed by stretching or stamping a metal plate as a whole, or can be formed by stretching or stamping different metal plates and then welding them together, or can be formed by connecting the inner bottom 201 formed by stretching or stamping a metal plate and the inner body 202 formed by glass.

[0058] Example 1

[0059] In this embodiment, the electric kettle comprises an outer shell 1 and an inner pot 2. The inner pot 2 is completely disposed within the outer shell 1. The inner pot 2 comprises a stainless steel inner pot body 21 and an aluminum heat conductor 22 attached to the outer side of the bottom of the inner pot body 21. The heater 3 is a C-shaped heating tube disposed around the outer periphery of the aluminum heat conductor 22. The inner surface of the bottom of the inner pot body 21 comprises a central transverse surface 212 and an arcuate surface 211 extending upward and outwardly from the transverse surface 212. The transverse surface 212 is a smooth, circular horizontal surface, while the arcuate surface 211 is formed by an arc line rotating around the edge of the transverse surface 212.

[0060] Specifically, the heating power of the electric kettle is 1800W, the equivalent diameter of the upper edge of the arc-shaped surface 211 is 128mm, the height of the arc-shaped surface 211 is 60mm, and the distance between the heating element 3 and the transverse surface 212 is 3mm. The heating speed and noise data of the electric kettle corresponding to different equivalent diameters of the transverse surface 212 are shown in Table 1 and Figure 4, where the heating speed of the electric kettle is represented by the time required to heat 1.7L of water from 40°C to 90°C. Figure 4 shows the noise value and heating speed value at different equivalent diameter ratios in this embodiment, where the horizontal axis represents the equivalent diameter ratio, the left vertical axis represents the noise value (unit: decibel), and the right vertical axis represents the heating speed value (unit: second).

[0061] As shown in Figure 4, as the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 increases, the heating speed of the electric kettle gradually increases, while the noise generated by the electric kettle during boiling increases. When the equivalent diameter ratio increases to 0.42, further increasing the equivalent diameter ratio does not significantly increase the heating speed, but further increasing the equivalent diameter ratio causes a significant increase in the noise during boiling. As the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 decreases, the heating speed of the electric kettle gradually decreases, while the noise during boiling decreases. When the equivalent diameter ratio decreases to 0.12, further decreasing the equivalent diameter ratio has little effect on reducing the noise, but significantly reduces the heating speed. Therefore, when the equivalent diameter ratio is between 0.12 and 0.42, the electric kettle of this embodiment can achieve both a faster heating speed and reduced noise, making the noise during boiling even less than 60 decibels.

[0062] Table 1: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 1

[0063] Example 2

[0064] Unlike Example 1, in this embodiment, the inner body 202 of the electric kettle is made of glass, and the inner bottom 201 of the electric kettle is formed by stretching a stainless steel plate. The heating power of the electric kettle is 1800W, the equivalent diameter of the upper edge of the curved surface 211 is 128mm, the height of the curved surface 211 is 60mm, and the distance between the heating element 3 and the transverse surface 212 is 6mm. Other features are the same as those of Example 1. The heating speed and noise data of the electric kettle corresponding to different equivalent diameters of the transverse surface 212 are shown in Table 2 and Figure 5, where the heating speed of the electric kettle is characterized by the time required to heat 1.7L of water from 40°C to 90°C. Figure 5 shows the noise value and heating speed value at different equivalent diameter ratios in this embodiment, where the horizontal axis represents the equivalent diameter ratio, the left vertical axis represents the noise value (unit: decibel), and the right vertical axis represents the heating speed value (unit: second).

[0065] As shown in Figure 5, as the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 increases, the heating speed of the electric kettle gradually increases, while the noise generated by the electric kettle during boiling increases. When the equivalent diameter ratio increases to 0.42, further increasing the equivalent diameter ratio does not significantly increase the heating speed, but further increasing the equivalent diameter ratio causes a significant increase in the noise during boiling. As the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 decreases, the heating speed of the electric kettle gradually decreases, while the noise during boiling decreases. When the equivalent diameter ratio decreases to 0.12, further decreasing the equivalent diameter ratio has little effect on reducing the noise, but significantly reduces the heating speed. Therefore, when the equivalent diameter ratio is between 0.12 and 0.42, the electric kettle of this embodiment can achieve both a faster heating speed and reduced noise, making the noise during boiling even less than 60 decibels.

[0066] Table 2: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 2

[0067] Example 3

[0068] Unlike Example 1, in this embodiment, the heating power of the electric kettle is 1600W, the equivalent diameter of the upper edge of the arcuate surface 211 is 120mm, the height of the arcuate surface 211 is 40mm, the distance between the heating element 3 and the transverse surface 212 is 10mm, and the other features are the same as those in Example 1. The heating speed and noise data of the electric kettle corresponding to different equivalent diameters of the transverse surface 212 are shown in Table 3 and Figure 6, where the heating speed of the electric kettle is characterized by the time required to heat 1.5L of water from 40°C to 90°C. Figure 6 shows the noise value and heating speed value at different equivalent diameter ratios in this embodiment, where the horizontal axis represents the equivalent diameter ratio, the left vertical axis represents the noise value (unit: decibel), and the right vertical axis represents the heating speed value (unit: second).

[0069] As shown in Figure 6, as the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 increases, the heating speed of the electric kettle gradually increases, while the noise generated during boiling increases. When the equivalent diameter ratio increases to 0.44, further increasing the equivalent diameter ratio does not significantly increase the heating speed, but further increasing the equivalent diameter ratio causes a significant increase in the noise during boiling. As the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 decreases, the heating speed of the electric kettle gradually decreases, while the noise during boiling decreases. When the equivalent diameter ratio decreases to 0.10, further decreasing the equivalent diameter ratio has little effect on reducing the noise, but significantly reduces the heating speed. Therefore, when the equivalent diameter ratio is between 0.10 and 0.44, the electric kettle of this embodiment can achieve both a faster heating speed and reduced noise, reducing the noise level during boiling to less than 60 decibels.

[0070] Table 3: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 3

[0071] Example 4

[0072] Unlike Example 1, in this embodiment, the heating power of the electric kettle is 1200W, the equivalent diameter of the upper edge of the arcuate surface 211 is 120mm, the height of the arcuate surface 211 is 15mm, the distance between the heating element 3 and the transverse surface 212 is 6mm, and the other features are the same as those in Example 1. The heating speed and noise data of the electric kettle corresponding to different equivalent diameters of the transverse surface 212 are shown in Table 4 and Figure 7, where the heating speed of the electric kettle is characterized by the time required to heat 1.2L of water from 40°C to 90°C. Figure 7 shows the noise value and heating speed value at different equivalent diameter ratios in this embodiment, where the horizontal axis represents the equivalent diameter ratio, the left vertical axis represents the noise value (unit: decibel), and the right vertical axis represents the heating speed value (unit: second).

[0073] As shown in Figure 7, as the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 increases, the heating speed of the electric kettle gradually increases, while the noise generated by the electric kettle during boiling increases. When the equivalent diameter ratio increases to 0.42, further increasing the equivalent diameter ratio does not significantly increase the heating speed, but further increasing the equivalent diameter ratio causes a significant increase in the noise during boiling. As the equivalent diameter ratio between the transverse surface 212 and the upper edge of the curved surface 211 decreases, the heating speed of the electric kettle gradually decreases, while the noise during boiling decreases. When the equivalent diameter ratio decreases to 0.14, further decreasing the equivalent diameter ratio has little effect on reducing the noise, but significantly reduces the heating speed. Therefore, when the equivalent diameter ratio is between 0.14 and 0.42, the electric kettle of this embodiment can achieve both a faster heating speed and reduced noise, making the noise during boiling even less than 60 decibels.

[0074] Table 4: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 4

[0075] The test data from Examples 1 to 4 show that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the curved surface 211 increases, the heating speed of the electric kettle gradually increases and then remains relatively unchanged. Conversely, as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the curved surface 211 decreases, the noise level during boiling gradually decreases and then remains relatively unchanged. When the equivalent diameter ratio is between 0.14 and 0.42, the electric kettle boils water with relatively low noise (less than 60 decibels) and relatively high heating speed. Furthermore, a comparison of the test data from Examples 4 and 3 shows that the noise level and heating speed during boiling remain essentially unchanged when the height of the curved surface 211 varies. However, when the height of the curved surface 211 is greater (greater than the equivalent diameter of the transverse surface 212), the noise reduction effect and heating speed are both better than when the height of the curved surface 211 is smaller (less than the equivalent diameter of the transverse surface 212). It can be understood that if the power of the heating element 3 in Example 1, Example 2 and Example 3 is a slightly smaller 1400W, and the power of the heating element 3 in Example 4 is a slightly smaller 1000W, the noise reduction effect and the heating speed change trend are also the same, which will not be repeated here due to space limitations.

[0076] The electric kettle of the present application can reduce noise by several decibels. Since decibels are a unit used to measure sound intensity and are generally used to represent sound gain, a noise reduction of 3 decibels is equivalent to a sound intensity reduction of 50% of the original sound intensity. In other words, the electric kettle of the present application has a significant noise reduction effect. By reasonably setting the equivalent diameter ratio of the transverse surface 212 to the upper edge of the curved surface 211, the present application can effectively improve the noise level when boiling water in the electric kettle while also increasing the heating speed.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications made according to the present invention are covered by the scope of the claims of the present invention and will not be listed one by one here.

Claims

1. An electric kettle having an inner container for containing liquid, characterized in that: The inner pot includes an inner pot bottom and an inner pot body extending from the upper edge of the inner pot bottom to the inner pot opening, the inner surface of the inner pot bottom includes a transverse surface located at the center of the bottom and an arc-shaped surface extending upward and convex around the transverse surface, the inner pot bottom is provided with a heating element at a position corresponding to the arc-shaped surface, the height of the arc-shaped surface is greater than the equivalent diameter of the transverse surface, and the ratio of the equivalent diameter of the transverse surface to the equivalent diameter of the upper edge of the arc-shaped surface is 0.14-0.

42.

2. The electric kettle according to claim 1, characterized in that: The power of the heating element is not less than 1500W; or, the ratio of the power of the heating element to the maximum water boiling capacity of the electric kettle is not less than 1000W / L.

3. The electric kettle according to claim 1, characterized in that: The vertical distance from the lower edge of the heating element to the transverse surface is 0.05-0.4 times the height of the arc surface.

4. The electric kettle according to claim 1, characterized in that: The transverse surface is a circular transverse surface.

5. The electric kettle according to claim 1, characterized in that: The equivalent diameter of the arc-shaped surface gradually increases from bottom to top.

6. The electric kettle according to claim 1, characterized in that: The inner container body is cylindrical, and the upper edge of the arc surface is tangentially connected to the lower edge of the inner container body.

7. The electric kettle according to claim 1, characterized in that: The inner liner body includes a second inner liner body and a first inner liner body integrally formed with the upper edge of the arc-shaped surface, and the first inner liner body and the second inner liner body are connected by welding.

8. The electric kettle according to claim 1, characterized in that: The inner liner comprises a stainless steel inner liner body and an aluminum heat conductive member attached to the outer side of the inner liner body, the heating member is arranged on the outer wall of the aluminum heat conductive member, and the upper edge of the aluminum heat conductive member is lower than the upper edge of the arc surface.

9. The electric kettle according to claim 8, characterized in that: The inner liner is made of a composite plate, and the composite plate includes a stainless steel layer and an aluminum layer. The stainless steel layer constitutes the inner liner body, and the aluminum layer constitutes the aluminum heat conducting member.

10. The electric kettle according to claim 8, characterized in that: The outer wall of the aluminum heat conductor includes a horizontal wall and an arc-shaped wall surrounding the horizontal wall. The heating element is arranged around the arc-shaped wall. A temperature controller is installed on the horizontal wall. The temperature sensing element of the temperature controller is offset relative to the center of the inner tank.

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