Electric kettle

Abstract

The electric kettle is provided with an inner container for containing liquid, the inner container comprises an inner container bottom and an inner container body extending from the upper edge of the inner container bottom to an inner container opening, the inner surface of the inner container bottom comprises a transverse face located in the center of the bottom and an arc-shaped face extending upwards around the transverse face and protruding outwards, and a heating piece is arranged at the position, corresponding to the arc-shaped face, of the inner container bottom. The height of the arc-shaped face is larger than the equivalent diameter of the transverse face, and the ratio of the equivalent diameter of the transverse face to the equivalent diameter of the upper edge of the arc-shaped face is 0.14-0.42. According to the electric kettle, by reasonably designing the size of the central transverse surface, the heating efficiency can be compatible while noise is reduced, it is guaranteed that the electric kettle has the low noise and the high water boiling speed, and the use experience of a user is met.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to an electric kettle. Background Art

[0002] 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 splitting noise by reducing the bubble generation speed when boiling water, but this solution prolongs the boiling time, and 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 increase the coating on the inner surface of the liner, and suppress the generation speed of bubbles through the coating, thereby achieving the purpose of reducing noise. The disadvantage of this solution is that the coating falls off easily, which increases the production cost and causes 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 gather into large bubbles, thereby reducing the frequency of bubble rupture, thereby achieving the purpose of reducing the noise of boiling water.

[0003] For example, the applicant disclosed a liquid heater in the patent document with the prior application number CN202222997552.7, and its specific scheme for achieving noise reduction is: 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 utilized to make the bubbles slide from bottom to top along the slope surface, and then the small bubbles on the slope surface are merged into large bubbles, thereby reducing the small bubbles from breaking away from the bottom wall of the pot and entering the water. After the large bubbles break away from the bottom wall of the pot, it is more difficult to break in the water, thereby solving the problem of small and dense local bubbles and achieving significant noise reduction effect. The applicant also disclosed in the patent number CN201120307947.9 that the cup body (liner) of the soybean milk machine is made into a spherical form; in other prior arts, for example, Chinese patent CN201420057680.6 also discloses a liner of a soybean milk machine, which 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 with a narrow bottom and a wide top, and the angle between the hypotenuse and the straight side of the trapezoid is 5-60°, and the heating element is arranged on the hypotenuse. Although the above patents do not mention that there can be a noise reduction effect during the soybean milk boiling process, it is objectively possible to achieve a certain degree of noise reduction.

[0004] However, in the above-mentioned prior art, since the range of the arc surface (spherical surface) of the inner tank bottom wall is relatively large, the surface area of ​​the inner tank bottom wall becomes very large, that is, during the operation of the heating element, the area of ​​heat dissipation on the outer side of the inner tank bottom wall also becomes 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.

[0005] Patent No. CN201020559732.1 discloses a soybean milk machine cup body (liner), the bottom of which is composed of a circular arc surface and a circular plane in the center, and the electric heating element is arranged on the circular arc surface, wherein the circular plane occupies a larger proportion (more than 50%) of the entire bottom of the cup body (lateral dimension). It can be understood that, when the upper edge size of the circular arc surface (arc surface / spherical surface) is the same, the outer surface area of ​​the bottom of the cup body of the patent is much smaller than that of the prior art in which the arc surface (spherical surface) of the liner is arranged on the bottom wall of the liner in a larger range, and the heat dissipation area of ​​the outer side of the bottom of the cup body will be reduced accordingly.

[0006] However, it is understandable that since the central circular plane occupies a larger proportion of the entire bottom of the cup body, when the size of the upper edge of the arc surface is the same, the proportion of the arc surface will be correspondingly smaller. Even if the heating element is set on the arc surface, due to the thermal conductivity of the bottom wall of the pot, it is easy to form small bubbles on the central circular plane. The small bubbles formed on the central circular plane are difficult to slide and merge into large bubbles. When the small bubbles burst, it is easy to produce a large noise. In some prior art of electric kettles, it is even believed that the circular plane occupies a larger proportion of the entire bottom wall of the pot to reach more than 80% to be more preferred. This obviously ignores other factors that may cause noise in the process of solving the noise.

[0007] Therefore, for the electric kettle, the ratio of the central circular plane to the entire bottom wall of the kettle, as well as the relationship between the central circular plane and the arc surface, have opposite effects on the heating noise and heating speed of the electric kettle. In the prior art, people are often concerned only with the analysis of the impact of the electric kettle heating noise, and rarely pay attention to the heating speed problem, let alone the balance setting of the electric kettle heating noise and heating speed. Especially for high-power electric kettles, it is difficult to balance high-speed heating and noise reduction. Summary of the invention

[0008] In order to solve the problem that the existing technology sets an arc surface on the bottom of the electric kettle inner tank to solve the heating noise of the electric kettle, but fails to take into account the heating noise and heating speed, 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.

[0009] The present application is implemented 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 convexly 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 is 0.14-0.42.

[0010] 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, and a heating element is arranged at a position corresponding to the arc-shaped surface on the bottom of the inner pot. By arranging the convex arc-shaped surface on the bottom of the inner pot and arranging the 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, which increases the volume of the bubbles and reduces the frequency of bubble rupture, and 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 to be 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 the noise, ensuring that the electric kettle has a lower noise and a faster boiling speed, satisfying the user experience.

[0011] 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 very 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 heat dissipation on the outer side of the bottom wall of the inner pot is relatively small. Although the electric kettle can obtain 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 (<0.14), the area of ​​the transverse surface is small, the area of ​​the curved surface is large, and the area of ​​the heat dissipation on the outer side of the bottom wall of the inner pot 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 obtained, 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 arc 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 pot without affecting the heating speed of the heating element, but also make the bubbles tend to form on the arc surface and easily gather into large bubbles, which can effectively reduce the noise, and then take into account the heating noise and heating speed of the electric kettle when working. When the size and height of the upper edge of the arc surface of the inner pot are constant, the above effect can be better verified. In particular, when the height of the arc 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 arc surface remain unchanged: increasing the height of the arc surface can make the arc surface steeper on the one hand, and the bubbles generated on the arc surface can more easily slide along the arc surface and merge into large bubbles, reducing the noise generated by the bubble rupture. On the other hand, the height of the arc surface is greater than the equivalent diameter of the transverse surface, which can ensure that the area of ​​the arc surface is larger than the area of ​​the transverse surface, and the probability of bubbles generated on the arc surface is higher, further achieving the technical effect of reducing noise.

[0012] As a preferred embodiment, 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. For electric kettles with relatively high power of the heating element, or for electric kettles with relatively high power of the heating element per unit volume, the technical solution of the present application can better achieve a balance between heating speed and noise reduction.

[0013] As a preferred embodiment, the distance from the bottom edge of the heating element to the transverse surface is 0.05-0.4 times the height of the arc surface. With the above solution, when the arc surface and the transverse surface remain unchanged, the reasonable setting of the position of the heating element can further improve the noise of boiling water in the electric kettle. In this case, the ratio of the distance from the bottom edge of the heating element to the transverse surface to the height of the arc 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 is likely to cause 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 reduced, 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.

[0014] As a preferred embodiment, the transverse surface is a circular transverse surface. In the above scheme, the transverse surface is preferably a circular transverse surface, which 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, and the separation speed of the bubbles on the circular transverse surface can be reduced, thereby achieving the purpose of reducing noise.

[0015] As a preferred embodiment, the equivalent diameter of the arc surface increases gradually from bottom to top. As the equivalent diameter of the arc surface increases gradually, the bubbles generated on the arc surface can slide along the arc surface to form large bubbles, which reduces the speed of bubble rupture, reduces the formation of noise, and achieves the effect of noise reduction.

[0016] As a preferred embodiment, the inner liner body is cylindrical, and the upper edge of the arc 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 conical cylinder (such as a conical cylinder with a larger bottom and a smaller top), which is conducive to the production of the inner liner body and the connection between the inner liner body and the arc surface; especially when the upper edge of the arc surface is tangentially connected to the lower edge of the inner liner body, a continuous shape will be formed between the inner liner body and the arc surface, which will make it very easy for consumers to clean after use, thereby improving the user experience.

[0017] As a preferred embodiment, the inner tank body includes a second inner tank body and a first inner tank body integrally formed with the upper edge of the curved surface, and the first inner tank body and the second inner tank body are connected by welding. In this way, a part of the inner tank body is set as an integrally formed structure with the curved surface, which, on the one hand, facilitates the connection between the curved surface and the transverse surface and the inner tank body when they are formed, and on the other hand, the connection method of the inner tank body is simpler, the process difficulty is reduced, and it is conducive to industrialized manufacturing.

[0018] As a preferred embodiment, the inner liner includes a stainless steel inner liner body and an aluminum heat conductor attached to the lower outer 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. The aforementioned scheme is adopted, 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 uniformly 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 can 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 easy to spread to the surroundings through the aluminum heat conductor, and the heat transferred to the thermostat is less, and 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.

[0019] As a preferred embodiment, the inner liner is made of a composite plate, 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 conductor. Adopting the above scheme, the inner liner is composed of a composite plate, the inner liner includes an internal stainless steel layer and an external aluminum layer, and the aluminum heat conductor is constituted by the aluminum layer, which can effectively avoid the problem of too low heating speed caused by loose welding between the aluminum heat conductor and the inner liner body, and greatly improve the water boiling speed of the electric kettle.

[0020] 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 installed on the horizontal wall, and the temperature sensing element of the thermostat is offset relative to the center of the inner pot. 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-burned, the thermostat can respond promptly and quickly, and promptly control the heating element to cut off power, avoiding safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the electric kettle of the present application.

[0022] Figure 2 It is a schematic diagram of the structure of the inner container of the electric kettle of the present application.

[0023] Figure 3 It is a schematic diagram of the assembly of the inner tank of the electric kettle of the present application.

[0024] Figure 4 It is a noise and heating rate diagram at different equivalent diameter ratios of Example 1 of the present application.

[0025] Figure 5 This is a diagram of noise and heating rate at different equivalent diameter ratios of Example 2 of the present application.

[0026] Figure 6 This is a diagram of noise and heating rate at different equivalent diameter ratios of Example 3 of the present application.

[0027] Figure 7 This is a diagram of noise and heating rate at different equivalent diameter ratios of Example 4 of the present application.

[0028] The meanings of the various marks in the figure are as follows: 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

[0029] 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.

[0030] 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.

[0031] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. As for the positional relationships such as "upstream" and "downstream", they are based on the positional relationships when the fluid flows normally.

[0032] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly 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.

[0035] The electric kettle in the prior art generally includes a kettle body and a base. The kettle body is provided with a handle, the bottom of the kettle body is provided with an upper coupler, and the base is provided with a lower coupler. When the kettle body is placed on the base, the kettle body can be powered on by coupling the upper coupler and the lower coupler. The kettle body generally includes an outer shell and an inner liner arranged in the outer shell. A heating element is provided on the outer wall of the inner liner. The heating element heats the inner liner. The inner liner contains a water source, thereby heating the water in the inner liner. Of course, there are also electric kettles in the prior art in which the base and the kettle body are integrated. The power cord of this electric kettle is directly connected to the kettle body, and there is no need to set a base, which is low in cost.

[0036] At present, when boiling water in electric kettles on the market, a large number of bubbles will be generated on the inner surface of the inner pot, which is particularly obvious when the water boiling power is high. The noise generated by the bursting of bubbles is relatively high, up to 70 decibels, which greatly affects the user experience. Although the prior art discloses a method of setting a central plane and an arc surface surrounding the central plane on the inner surface of the inner pot to suppress noise, it only considers the effect of the size of the central plane on the noise, and does not realize the effect of the size of the central plane on the heating speed of the electric kettle when boiling water, resulting in the inability to take into account both the heating speed and the noise reduction.

[0037] 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, such as Figure 1-3 As shown, the electric kettle of the present application comprises an outer shell 1 and an inner shell 2 for holding liquid, the outer shell 1 is provided with a handle 11, the inner shell 2 comprises an inner shell bottom 201 and an inner shell body 202 extending from the upper edge of the inner shell bottom 201 to the opening of the inner shell 2, the inner surface of the inner shell bottom 201 comprises a transverse surface 212 located in the center and an arcuate surface 211 extending upward and convexly around the transverse surface 212, the heating element 3 is arranged on the outer side of the inner shell 2 corresponding to the arcuate surface 211, the heating element 3 is an annular heating tube, the heating tube surrounds the outer side of the arcuate surface 211, the height H of the arcuate 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 arcuate surface 211 is 0.14-0.42. It can be understood that the equivalent diameter of the transverse surface 212 is the diameter of a circle having the same area as the transverse surface 212, and the equivalent diameter of the upper edge of the arc surface 211 is the diameter of a circle having the same area as the area of ​​the area enclosed by the upper edge of the arc surface 211 (specifically, the upper edge of the arc surface 211 can be projected onto a horizontal plane and the area of ​​the projected area can be calculated). In addition, preferably, the height of the inner tank body 202 is greater than the height of the arc surface 211. When the volume of the inner tank is the same, a higher inner tank body can ensure that the electric kettle is slender and beautiful.

[0038] 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 integrally formed or separately arranged. 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.

[0039] The outer shell 1 of the present application is wrapped around the outside of the inner liner 2, and there are several specific schemes: Scheme 1: The upper edge of the outer 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 outer shell 1. The inner liner bottom 201 and the inner liner body 202 are completely wrapped by the outer shell. Such a setting of the electric kettle has a good heat preservation effect; Scheme 2: The upper edge of the outer 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 outer 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 boiling water situation can be observed from the part covered by the shell, which improves the user experience; Solution 3: The upper edge of the shell 1 extends to the upper edge of the inner pot bottom 201, that is, the shell 1 completely covers the inner pot bottom 201, and the inner pot body 202 is exposed outside, which has a better visual experience than the electric kettle of Solution 2; Solution 4: The upper edge of the shell 1 extends to the lower side of the upper edge of the inner pot bottom 201, that is, the inner pot bottom 201 is partially covered by the shell 1, and the inner pot bottom 201 is partially placed in the space formed by the shell 1, and the shell 1 covers the area above the heating element 3 of the inner pot bottom 201, and this solution also has a good visual experience. Among them, the shell 1 of Solution 1, Solution 2, and Solution 3 all completely covers the inner pot bottom 201, and the shell 1 of Solution 4 partially covers the inner pot bottom 201.

[0040] The present application can reduce noise while taking into account the heating speed by reasonably designing the size of the central transverse surface 212, so as to ensure that the electric kettle has a lower noise and a faster water boiling speed, and satisfy 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 arc surface 211 is large (greater than 0.42), the area of ​​the arc surface 211 is relatively small, the area of ​​the transverse surface 212 is relatively large, and the area of ​​the heat dissipation outside the bottom wall of the inner tank 2 is relatively small. Although the electric kettle can obtain a faster heating speed, the heat conducted to the arc surface 211 by the heating element 3 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 arc 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's 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 arc surface 211 is very small (<0.14), the area of ​​the transverse surface 212 is small, the area of ​​the arc surface 211 is large, and the area of ​​the heat dissipation outside the bottom wall of the inner pot 2 is relatively large, which will aggravate the heat dissipation of the heating element 3 during the heating process, resulting in a slower heating speed. Although the area of ​​the arc 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 arc surface 211 is moderate (0.14-0.42), it can not only meet the area of ​​heat dissipation outside the bottom wall of the inner pot 2 without affecting the heating speed of the heating element 3, but also make the bubbles tend to form on the arc surface 211 and easily gather into large bubbles, which can effectively reduce noise, and then 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 arc surface 211 of the inner pot 2 are constant, the above effect can be better verified. Especially when the height of the arc 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 arc surface 211 remain unchanged: increasing the height of the arc surface 211 can, on the one hand, make the arc surface 211 steeper, and the bubbles generated on the arc surface 211 can more easily slide along the arc surface 211 and merge into large bubbles, thereby reducing the noise generated by bubble rupture; on the other hand, the height of the arc surface 211 is greater than the equivalent diameter of the transverse surface 212, which can ensure that the area of ​​the arc surface 211 is larger than the area of ​​the transverse surface 212, thereby ensuring that the probability of bubbles being generated on the arc surface 211 is higher, thereby further achieving the technical effect of reducing noise.

[0041] In the present application, the inner pot 2 of the electric kettle includes a stainless steel inner pot body 21 and an aluminum heat conductive member 22 attached to the outer side of the inner pot body 21, and a heating member 3 is arranged on the outer side of the aluminum heat conductive member 22. The inner pot body 21 can be formed by stretching or stamping a stainless steel plate, and the aluminum heat conductive member 22 is welded on 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, and the composite plate includes an inner stainless steel layer and an outer aluminum layer, the stainless steel layer constitutes the inner pot body 21, and the aluminum layer constitutes the aluminum heat conductive member 22.

[0042] In a preferred embodiment of the present application, the inner liner 2 of the electric kettle may 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, 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, a transverse surface 212 and an arc surface 211 are arranged on the inner surface of the bottom of the inner liner body 21, and a portion of the inner liner body 21 located on the upper edge of the arc surface 211 constitutes the inner liner body 202.

[0043] Specifically, the aluminum heat conductor 22 has a horizontal wall 222 and an arcuate wall 221. The horizontal wall 222 is arranged below the transverse surface 212, and the arcuate wall 221 surrounds the outer side of the arcuate surface 211. The heating element 3 is a C-shaped heating tube, and the heating element 3 is arranged around the arcuate wall 221. A thermostat is arranged 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 this 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 is dry-burned, the thermostat can respond promptly and quickly, and promptly control the heating element 3 to cut off the power, thereby avoiding safety hazards.

[0044] In order to further reduce noise, preferably, the upper edge of the aluminum heat conductor 22 is lower than the upper edge of the arc surface 211, and the heating element 3 is fixed around the outer wall of the aluminum heat conductor 22 opposite to the arc surface 211. In this way, 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 easy to spread to the surroundings through the aluminum heat conductor 22, and the heat transferred to the thermostat is less, and the thermostat is not easy to trip, which can easily lead to the problem that the electric kettle cannot be tripped in time when it is dry-burned, affecting the safety performance of the product.

[0045] 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), which is conducive to the production of the inner liner body 202 and 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 the convenience of cleaning after use by consumers 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, and the first inner liner body 2022 and the second inner liner body 2021 are welded and connected. In this way, a part of the inner liner body 202 and the curved surface 211 are set as 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.

[0046] In another preferred embodiment of the present application, the inner pot 2 is made of a composite plate, the composite plate includes a stainless steel layer and an aluminum layer, the stainless steel layer constitutes the inner pot body 21, and the aluminum layer constitutes the aluminum heat conductor 22. In this way, the aluminum heat conductor 22 is constituted by the aluminum layer, which can effectively avoid the problem of too low heating speed caused by the loose welding between the aluminum heat conductor 22 and the inner pot body 21, and greatly improve the water boiling speed of the electric kettle.

[0047] In the present application, the heating element 3 is preferably a C-shaped heating tube, the heating element 3 has a notch, and the projection of the temperature sensing element of the thermostat on the horizontal plane is located outside the projection of the area formed by the center of the bottom of the inner pot 201 and the line connecting the two ends of the notch on the horizontal plane. By adopting the above 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 the 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 that when the power of the heating element 3 is not less than 1500W or the ratio of the power of the heating element 3 to the maximum water boiling capacity of the electric kettle is not less than 1000W / L, the balance between high-speed heating and noise reduction can be well achieved. Of course, the technical solution of the present application is also applicable to electric kettles whose power of the heating element 3 is less than 1500W or whose ratio of the power of the heating element 3 to the maximum water boiling capacity is less than 1000W / L. It can be understood that for an electric kettle with a maximum water level, the maximum water boiling capacity of the electric kettle is the capacity marked by the maximum water level of the electric kettle, and for an electric kettle that can automatically fill water, the maximum water boiling capacity can be the maximum water boiling capacity preset by the machine or the selectable maximum water boiling capacity.

[0048] In addition, in the present application, the inner surface of the inner pot 2 is provided with a minimum water level mark, and the minimum water level mark is higher than the upper edge of the arc 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 arc surface 211 is also the volume of the inner pot bottom 201 of the electric kettle. Designing the upper edge of the arc surface 211 to be lower than the minimum water level mark can ensure that the arc surface 211 is always in contact with water when the user boils water, and avoids the water level being too low, resulting in the upper end of the arc 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 arc surface 211, causing the arc surface 211 to vibrate and cause the bubbles to escape.

[0049] In addition, in order to further reduce the noise when the electric kettle is boiling water, in the present application, the 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 when the electric kettle boils water will be better improved; but 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 relatively far away from the transverse surface 212, the reduction in noise when the electric kettle boils water is very limited, or even no longer reduced, and there is no need to further increase the height of the heating element 3, especially when the outer shell 1 is set outside the inner tank 2 of the electric kettle, the height of the heating tube is relatively large, and it is easy to affect the installation of the outer shell 1. When the 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 when boiling water can be reduced to a certain extent.

[0050] In the present application, the transverse surface 212 is preferably a circular plane extending horizontally. 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, the convection of the water flow on the transverse surface 212 can be reduced, and the speed of the bubbles on the transverse surface 212 can be reduced, so as to achieve the purpose of reducing noise. It can be understood that the transverse surface 212 is a plane extending laterally, the plane can be a smooth plane, the plane can also be provided with protrusions or patterns, the transverse surface 212 can also be a plane with a small inclination angle with the horizontal plane, such as a plane inclined at 5° with the horizontal plane, of course, the transverse surface 212 can also be a plane with a certain height fluctuation as a whole, such as a fluctuating surface with a height difference of 2 mm between the highest point and the lowest point, etc., in the case of meeting the spirit of the present application, other embodiments of the transverse surface 212 should also be within the scope of protection of the present application. In addition, the shape of the transverse surface 212 can be circular, elliptical, rounded rectangle, etc., which will not be repeated here.

[0051] In the present application, the arc surface 211 is preferably a curved surface formed by an arc line rotating around the edge of the transverse surface 212, and the equivalent diameter of the arc surface 211 is preferably gradually increased from bottom to top, that is, the width of the arc surface 211 is gradually increased. In this way, bubbles generated at any position of the arc surface 211 during the water boiling process can slide along the arc surface 211, so that small bubbles converge into large bubbles, reducing the noise generated when the bubbles burst. It can be understood that the arc surface 211 can be a spherical surface, an ellipsoidal surface, or a curved surface of other shapes.

[0052] 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.

[0053] It can be understood that the distance from the lower edge of the heating element 3 of the electric kettle of the present application to the transverse 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.

[0054] It is understandable that the electric kettle of the present application can be an electric kettle with a kettle body and a base integrated, or an electric kettle with a kettle body and a base separated. For a separated electric kettle, components such as the inner tank 2, the outer shell 1, and the heating element 3 are arranged on the kettle body. The electric kettle of the present application is an electric kettle in a broad sense, which can heat beverages in addition to boiling water.

[0055] 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 integrally stretching or stamping a metal plate, or can be formed by welding different metal plates after stretching or stamping, 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.

[0056] Embodiment 1.

[0057] In this embodiment, the electric kettle comprises an outer shell 1 and an inner pot 2, wherein the inner pot 2 is completely arranged inside the outer shell 1, and the inner pot 2 comprises a stainless steel inner pot body 21 and an aluminum heat-conducting member 22 attached to the outer side of the bottom of the inner pot body 21, and the heating member 3 is a C-shaped heating tube, and the heating member 3 is arranged around the outer periphery of the aluminum heat-conducting member 22. The inner surface of the bottom of the inner pot body 21 has a central transverse surface 212 and an arc-shaped surface 211 extending upward and convexly around the transverse surface 212, wherein the transverse surface 212 is a circular smooth horizontal surface, and the arc-shaped surface 211 is an arc-shaped surface 211 formed by an arc line rotating around the edge of the transverse surface 212.

[0058] Specifically, the heating power of the electric kettle is 1800W, the equivalent diameter of the upper edge of the arc surface 211 is 128mm, the height of the arc 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 the equivalent diameter of different transverse surfaces 212 are shown in Table 1 and Figure 4 , where the heating speed of the electric kettle is characterized by the time required to heat 1.7L of water from 40℃ to 90℃.

[0059] from Figure 4 It can be seen that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to increase, the heating speed of the electric kettle gradually increases, and the noise generated when the electric kettle boils water continues to decrease. When the equivalent diameter ratio increases to 0.42, continuing to increase the equivalent diameter ratio does not significantly increase the heating speed, but continuing to increase the equivalent diameter ratio will cause the noise when boiling water to increase significantly. As the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to decrease, the heating speed of the electric kettle gradually decreases, and the noise when the electric kettle boils water continues to decrease. When the equivalent diameter ratio decreases to 0.12, continuing to reduce the equivalent diameter ratio has little effect on reducing the noise, but the heating speed will be significantly reduced. Therefore, when the equivalent diameter ratio of the electric kettle of this embodiment is between 0.12-0.42, it can take into account both faster heating speed and noise reduction, so that the noise when boiling water is even lower than 60 decibels.

[0060] Table 1: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 1. Equivalent diameter ratio 0.05 0.08 0.1 0.12 0.19 0.25 0.31 0.39 0.42 0.47 0.51 0.58 0.7 0.9 <![CDATA[Noise( db )]]> 58.1 58.2 58.4 58.6 58.7 58.9 59.2 59.5 59.8 60.8 61.9 63 64.4 65.1 Heating speed(s) 236.2 233.1 230 226.8 226.1 225.8 225.1 224.6 223 222.2 222.1 222 221 221.2

[0061] Embodiment 2.

[0062] Different from the first embodiment, in this embodiment, the inner tank body 202 of the electric kettle is made of glass, the inner tank 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 arc surface 211 is 128mm, the height of the arc surface 211 is 60mm, the distance between the heating element 3 and the transverse surface 212 is 6mm, and the other features are the same as those of the first embodiment. The heating speed and noise data of the electric kettle corresponding to the equivalent diameter of different transverse surfaces 212 are shown in Tables 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℃ to 90℃.

[0063] from Figure 5It can be seen that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to increase, the heating speed of the electric kettle gradually increases, and the noise generated when the electric kettle boils water continues to decrease. When the equivalent diameter ratio increases to 0.42, continuing to increase the equivalent diameter ratio does not significantly increase the heating speed, but continuing to increase the equivalent diameter ratio will cause the noise when boiling water to increase significantly. As the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to decrease, the heating speed of the electric kettle gradually decreases, and the noise when the electric kettle boils water continues to decrease. When the equivalent diameter ratio decreases to 0.12, continuing to reduce the equivalent diameter ratio has little effect on reducing the noise, but the heating speed will be significantly reduced. Therefore, when the equivalent diameter ratio of the electric kettle of this embodiment is between 0.12-0.42, it can take into account both faster heating speed and noise reduction, so that the noise when boiling water is even lower than 60 decibels.

[0064] Table 2: Noise and heating rate data corresponding to different equivalent diameter ratios of Example 2. Equivalent diameter ratio 0.05 0.08 0.1 0.12 0.19 0.25 0.31 0.39 0.42 0.47 0.51 0.58 0.7 0.9 <![CDATA[Noise( db )]]> 58.2 58.3 58.5 58.8 58.9 58.9 59.1 59.5 59.8 60.7 61.8 62.8 64.5 65.2 Heating speed(s) 241.8 238.7 235.5 231.5 230.9 230.2 229.6 229.6 228.2 227.0 226.9 226.5 225.8 226.1

[0065] Embodiment three.

[0066] Different from the first embodiment, in this embodiment, the heating power of the electric kettle is 1600W, the equivalent diameter of the upper edge of the arc surface 211 is 120mm, the height of the arc 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 of the first embodiment. The heating speed and noise data of the electric kettle corresponding to the equivalent diameter of different transverse surfaces 212 are shown in Tables 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℃ to 90℃.

[0067] from Figure 6 It can be seen that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to increase, the heating speed of the electric kettle gradually increases, and the noise generated when the electric kettle boils water continues to decrease. When the equivalent diameter ratio increases to 0.44, continuing to increase the equivalent diameter ratio does not significantly increase the heating speed, but continuing to increase the equivalent diameter ratio will cause the noise when boiling water to increase significantly. As the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to decrease, the heating speed of the electric kettle gradually decreases, and the noise when the electric kettle boils water continues to decrease. When the equivalent diameter ratio decreases to 0.10, continuing to reduce the equivalent diameter ratio has little effect on reducing the noise, but the heating speed will be significantly reduced. Therefore, when the equivalent diameter ratio of the electric kettle of this embodiment is between 0.10-0.44, it can take into account both faster heating speed and noise reduction, so that the noise when boiling water is even lower than 60 decibels.

[0068] Table 3: Noise and heating rate data corresponding to different equivalent diameter ratios in Example 3. Equivalent diameter ratio 0.05 0.08 0.1 0.14 0.19 0.25 0.31 0.39 0.44 0.47 0.51 0.58 0.7 0.9 <![CDATA[Noise( db )]]> 57.5 57.7 57.8 58.1 58.5 58.8 58.9 59.2 59.5 60.8 61.5 62.2 62.8 63.2 Heating speed(s) 229.1 225.9 220.8 219.8 219.0 219.1 218.8 217.8 216.7 215.3 215.9 215.2 214.5 214.6

[0069] Embodiment 4.

[0070] Different from the first embodiment, in this embodiment, the heating power of the electric kettle is 1200W, the equivalent diameter of the upper edge of the arc surface 211 is 120mm, the height of the arc surface 211 is 15mm, the distance between the heating element 3 and the transverse surface 212 is 6mm, and other features are the same as those of the first embodiment. The heating speed and noise data of the electric kettle corresponding to the equivalent diameter of different transverse surfaces 212 are shown in Tables 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℃ to 90℃.

[0071] from Figure 7 It can be seen that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to increase, the heating speed of the electric kettle gradually increases, and the noise generated when the electric kettle boils water continues to decrease. When the equivalent diameter ratio increases to 0.42, continuing to increase the equivalent diameter ratio does not significantly increase the heating speed, but continuing to increase the equivalent diameter ratio will cause the noise when boiling water to increase significantly. As the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 continues to decrease, the heating speed of the electric kettle gradually decreases, and the noise when the electric kettle boils water continues to decrease. When the equivalent diameter ratio decreases to 0.14, continuing to reduce the equivalent diameter ratio has little effect on reducing the noise, but the heating speed will be significantly reduced. Therefore, when the equivalent diameter ratio of the electric kettle of this embodiment is between 0.14-0.42, it can take into account both faster heating speed and noise reduction, so that the noise when boiling water is even lower than 60 decibels.

[0072] Table 4: Noise and heating rate data corresponding to different equivalent diameter ratios of Example 4. Equivalent diameter ratio 0.05 0.08 0.1 0.14 0.17 0.25 0.31 0.39 0.42 0.47 0.51 0.58 0.7 0.9 <![CDATA[Noise( db )]]> 56.3 56.3 56.5 56.8 57.2 57.6 58 58.6 59.2 60.4 61.2 62 62.4 62.5 Heating speed(s) 244.8 241.0 237.5 234.8 234.1 233.4 233.0 232.7 230.8 230.4 229.7 230.1 228.7 229.5

[0073] From the test data of the first to fourth embodiments, it can be seen that as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 increases, the heating speed of the electric kettle gradually increases and then remains relatively unchanged. On the contrary, as the equivalent diameter ratio of the transverse surface 212 to the upper edge of the arc surface 211 decreases, the noise of the electric kettle when boiling water gradually decreases and then remains relatively unchanged. When the equivalent diameter ratio is between 0.14 and 0.42, the electric kettle has a smaller noise (less than 60 decibels) and a faster heating speed when boiling water. In addition, from the comparison of the test data of the fourth embodiment and the third embodiment, it can be seen that when the height of the arc surface 211 is different, the change trend of the noise and heating speed of the electric kettle when boiling water is basically unchanged, but when the height of the arc surface 211 is larger (greater than the equivalent diameter of the transverse surface 212), the noise reduction effect and heating speed are better than the noise reduction effect and heating speed when the height of the arc 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 the same, which will not be repeated here due to space limitations.

[0074] In addition, although the electric kettle of the present application can only reduce the noise by a few decibels, since decibel is a unit used to measure sound intensity and is usually used to characterize the gain of sound, a noise reduction of 3 decibels is equivalent to a sound intensity reduction to 50% of the original sound intensity. Therefore, the present application can effectively improve the problem of loud noise when the electric kettle boils water and improve the heating speed by reasonably setting the equivalent diameter ratio of the transverse surface 212 and the upper edge of the arc surface 211.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. That is, 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. An 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 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. An electric kettle according to any one of claim 1, characterized in that: The transverse surface is a circular transverse surface.

5. An electric kettle according to any one of 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. An 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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