Heating disc of electric kettle and electric kettle
By setting up multiple circumferential spacer bosses on the chassis of the electric kettle heating plate, the problems of uneven heat conductivity and high noise are solved, more uniform heat transfer and noise reduction are achieved, and user experience is improved.
Patent Information
- Application Number
- CN202421137937.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The uneven thermal conductivity of the existing electric kettle heating plate causes the heating pipe installation area to quickly heat up, resulting in noise and bubble bursts, affecting the user experience.
Design an electric kettle heating plate. The bottom of the chassis is equipped with multiple bosses arranged in the circumferential direction. The heating pipe is connected to the axial direction of the chassis and is in direct or indirect contact with the boss. The thermal conductivity of the boss is greater than that of the chassis. Reduce the axial heat conduction area and increase the thickness, slow down the heat transfer speed, and transfer more heat in the radial direction, achieving uniform heating of the chassis.
Through uniform heating, bubble generation and noise during the boiling process are reduced, and user experience and product comfort are improved.
Smart Images

Figure CN222357531U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of household appliances, and in particular to a heating plate of an electric kettle, and also to an electric kettle. Background Art
[0002] In the related art, the heating plate assembly of the electric kettle usually includes a stainless steel base, a heat conducting plate and a heating tube, which are welded in sequence. During the heating process, since the heat transfer in the thickness direction of the heat conducting plate is stronger than that in the radial direction, the heating rate of the heat conducting plate in the installation area of the heating tube is faster than that of other areas of the heat conducting plate, causing bubbles to quickly form and burst in the area of the stainless steel base corresponding to the heating tube, resulting in loud noise, and worse user experience and product comfort. Utility Model Content
[0003] Based on this, it is necessary to propose a heating plate of an electric kettle to solve the problem of uneven heat conduction and high noise of the heating plate assembly. An electric kettle is also proposed.
[0004] According to one aspect of the present disclosure, a heating plate of an electric kettle includes: a chassis, a bottom surface of which is provided with a boss area, the boss area includes a plurality of bosses arranged at intervals along the circumference of the chassis; and a heating tube connected to the chassis, the position of the heating tube in the axial direction of the chassis corresponds to the boss area, and the heating tube is directly or indirectly in contact with each of the bosses.
[0005] In some embodiments, along the radial direction of the chassis, the width of the boss area is greater than the width of the heating tube, and the outer circumference of the heating tube is aligned with the outer peripheral edge of the boss area in the axial direction of the chassis.
[0006] In some embodiments, the boss and the chassis are made of different materials, and the thermal conductivity of the boss is greater than that of the chassis.
[0007] In some embodiments, the thickness of the boss in the axial direction of the chassis is smaller than the width of the boss in the radial direction of the chassis.
[0008] In some embodiments, the circumferential dimension of the boss decreases radially inwardly from the chassis.
[0009] In some embodiments, a blank area is further provided on the bottom surface of the chassis, and the blank area is located between the first and last bosses in the boss area, and the circumferential dimension of the blank area is greater than the circumferential dimension of the circumferential gap between adjacent bosses.
[0010] In some embodiments, in the axial direction of the chassis, the thickness of the chassis is 0.4mm-0.8mm; the thickness of the boss in the axial direction of the chassis is 0.4mm-0.5mm; and the boss area accounts for 73%-78% of the circumference of the chassis in the circumferential direction.
[0011] In some embodiments, the circumferential gaps between adjacent bosses are equal, and the sum of all circumferential gaps between adjacent bosses accounts for 36.5%-39% of the circumference.
[0012] In some embodiments, the heating plate further comprises a heat-conducting plate, the heat-conducting plate is connected to the bottom surface of the base plate, and the heating tube is connected to the bottom surface of the heat-conducting plate.
[0013] According to another aspect of the present disclosure, an electric kettle comprises: a kettle body for storing water; and the heating plate of the electric kettle described above, wherein the bottom plate constitutes the bottom wall of the kettle body, or the bottom plate is fixed to the bottom surface of the bottom wall of the kettle body.
[0014] By providing a plurality of circumferentially spaced bosses, on the one hand, the area of the region on the chassis that can directly transfer heat axially upward is reduced, thereby slowing down the axial heat conduction speed of the heating plate; on the other hand, the bosses increase the axial thickness of the chassis, thereby slowing down the axial heat transfer speed of the heating plate; thereby, more heat is transferred radially, so that the chassis is heated evenly and the temperature is relatively uniform, so that the number of bubbles generated during the water boiling process is small and the speed is slow, thereby reducing the noise during the water boiling process. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG1 is a schematic structural diagram of a heating plate of an electric kettle according to an embodiment of the present disclosure.
[0016] FIG. 2 is a schematic structural diagram of a bottom plate in a heating plate of an electric kettle according to an embodiment of the present disclosure.
[0017] FIG. 3 is a front view of the chassis shown in FIG. 2 .
[0018] FIG. 4 is a cross-sectional view of an electric kettle along its height direction according to an embodiment of the present disclosure.
[0019] Reference numerals:
[0020] 1. Electric kettle; 100. Heating plate; 10. Chassis; 110. Boss area; 111. Boss; 1111. Outer edge; 1112. Inner edge; 112. Outer periphery; 113. Inner periphery; 114. Circumferential gap; 120. Blank area; 20. Heating tube; 210. Outer circumference; 220. Inner circumference; 30. Heat conducting plate; 200. Kettle;
[0021] X, axial direction; Y, radial direction; Z, circumferential direction. DETAILED DESCRIPTION
[0022] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present disclosure, so the present disclosure is not limited by the specific embodiments disclosed below.
[0023] In the description of the present disclosure, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does 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 a limitation on the present disclosure.
[0024] In addition, if the terms "first" or "second" appear, these terms 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 at least one of the features. In the description of the present disclosure, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0025] As shown in Figures 1 to 3, an embodiment of the first aspect of the present disclosure provides a heating plate 100 for an electric kettle, wherein Figure 1 is a structural schematic diagram of the heating plate 100 of the electric kettle according to an embodiment of the present disclosure; Figure 2 is a structural schematic diagram of the chassis 10 in the heating plate 100 of the electric kettle according to an embodiment of the present disclosure; and Figure 3 is a front view of the chassis 10 shown in Figure 2.
[0026] As shown in Figures 1 to 3, the heating plate 100 includes a chassis 10 and a heating tube 20. The bottom surface of the chassis 10 is provided with a boss area 110, and the boss area 110 includes a plurality of bosses 111 arranged at intervals along the circumference of the chassis 10. The heating tube 20 is connected to the chassis 10, and the position of the heating tube 20 in the axial direction of the chassis 10 corresponds to the boss area 110, and the heating tube 20 is directly or indirectly in contact with each boss 111.
[0027] For the convenience of description, as shown in FIG. 1 , the X direction represents the axial direction of the chassis 10, the Y direction represents the radial direction of the chassis 10, and the Z direction represents the circumferential direction of the chassis 10. The X direction is also the height direction of the electric kettle 1 when in use (see FIG. 4 ). The terms top surface, bottom surface, upper surface, lower surface, etc. involved in the present disclosure are all based on the position of the electric kettle 1 when in use; for the same element, the top surface is located above the bottom surface, and the upper surface is located above the lower surface.
[0028] As shown in Fig. 4, an example of an electric kettle 1 having a heating plate 100 of the present disclosure is shown. Fig. 4 is a cross-sectional view of an electric kettle along its height direction according to an embodiment of the present disclosure. The electric kettle comprises a kettle 200 for storing water.
[0029] When the heating plate 100 of the present disclosure is applied to the electric kettle 1, the bottom plate 10 constitutes the bottom wall of the kettle 200, and the top surface of the bottom plate 10 is in direct contact with the water. The bottom plate 10 receives the heat from the heating tube 20 and then heats the water in the kettle 200. In addition, the bottom plate 10 can also be connected to the lower surface of the bottom wall of the kettle 200. The bottom plate 10 receives the heat from the heating tube 20 and then transfers it to the bottom wall of the kettle 200, and then heats the water in the kettle 200.
[0030] Each boss 111 is in direct or indirect contact with the heating tube 20 and can absorb the heat transferred by the heating tube 20 ; and there is a circumferential gap 114 (see FIG. 3 ) between the bosses 111 , and the lower surface of the chassis 10 at the circumferential gap 114 is separated from the heating tube 20 , and the separated part receives a small amount of heat transferred by the heating tube 20 in the form of thermal radiation, and receives the heat transferred by the boss 111 .
[0031] By providing a plurality of circumferentially spaced bosses 111, on the one hand, the area of the region on the chassis 10 that can directly transfer heat upward along the X direction is reduced, thereby slowing down the heat conduction speed of the heating plate 100 in the X direction. On the other hand, the bosses 111 increase the thickness of the chassis 10 in the X direction, thereby slowing down the heat transfer speed of the heating plate 100 in the X direction. Thus, more heat is transferred along the Y direction, so that the chassis 10 is heated evenly and the temperature is relatively uniform. In this way, the number of bubbles generated during the water boiling process is small and the speed is slow, thereby reducing the noise during the water boiling process.
[0032] Optionally, the boss 111 is configured as an integral piece with the chassis 10. For example, the boss 111 can be formed by stamping downward from the top surface of the chassis 10. Optionally, the boss 111 is fixed to the bottom surface of the chassis 10 by a thermally conductive adhesive.
[0033] As shown in Fig. 1, along the radial direction of the chassis 10, the width of the boss area 110 is greater than the width of the heating tube 20, and the outer circumference 210 of the heating tube 20 is aligned with the outer peripheral edge 112 of the boss area 110 in the axial direction of the chassis 10. Exemplarily, the width of the heating tube 20 is 13 mm (millimeters), and the width of the boss area 110 is 16 mm.
[0034] The inner circumference 113 of the boss area 110 is closer to the center of the chassis 10 than the inner circumference 220 of the heating tube 20, that is, the inner circumference 113 of the boss area 110 exceeds the inner circumference 220 of the heating tube 20. Through the above arrangement, after the heat is transferred from the heating tube 20 to the boss 111, the space for heat transfer along the Y direction is larger, so that more heat can be transferred to other areas of the chassis 10.
[0035] In order to increase the heat conductivity of the heating plate along the Y direction, in some embodiments, the boss 111 and the chassis 10 are made of different materials, and the heat conductivity of the boss 111 is greater than that of the chassis 10. Optionally, the boss 111 is made of aluminum and the chassis 10 is made of stainless steel.
[0036] After the heat is transferred from the heating tube 20 to the boss 111, the boss 111 continues to transfer the heat to the chassis 10 along the X direction, and also transfers the heat along the Y direction. The heat conductivity of the boss 111 is greater than that of the chassis 10, so the boss 111 can transfer more heat to other areas of the chassis 10 along the Y direction.
[0037] In order to increase the heat conduction capacity of the heating plate along the Y direction, in some embodiments, the thickness of the boss 111 in the axial direction of the chassis 10 is smaller than the width of the boss 111 in the radial direction of the chassis 10. Exemplarily, the thickness of the boss 111 is 0.4 mm-0.5 mm; the width of the boss 111 is 16 mm.
[0038] By setting the width of the boss 111 to be greater than the thickness of the boss 111, after the heat is transferred from the heating tube 20 to the boss 111, the area of the boss 111 used to transfer heat in the Y direction is larger, and more heat can be transferred to other areas of the chassis 10 along the Y direction.
[0039] As shown in Fig. 2 and Fig. 3, the circumferential dimension of the boss 111 tends to decrease along the radial direction inward of the chassis 10. The radial direction inward of the chassis 10 refers to the direction along the radial direction of the chassis 10 and pointing to the center O of the chassis 10. The circumferential dimension of the boss 111 tends to decrease, that is, along the radial direction inward of the chassis 10, the boss 111 has a structure of being larger outside and smaller inside.
[0040] In the present disclosure, when referring to the circumferential dimension of an object, the circumferential dimension refers to the width of the object in the circumferential direction of the chassis 10. That is, the circumferential dimension is: the chord length corresponding to the two intersection points of the circle with the center O of the chassis 10 as the center and the object.
[0041] Specifically, as shown in FIG. 3 , the cross-sectional shape of the boss 111 parallel to the Y direction is a trapezoid, the outer side 1111 of the boss 111 is a long side, and the inner side 1112 of the boss 111 is a short side.
[0042] After the heating tube 20 is connected to the chassis 10, the outer circumference 210 of the heating tube 20 is usually aligned with the outer circumference 112 of the boss area 110 in the axial direction of the chassis 10. Taking the cross-sectional shape of the boss 111 as an example, when the size of the outer side 1111 of the boss 111 is larger than the size of the inner side 1112 of the boss 111, the portion of the chassis 10 separated from the heating tube 20 by the boss 111 occupies a large proportion in the Z direction, reducing the area of the region on the chassis 10 that can directly transfer the heat of the heating tube 20 upward along the X direction, slowing down the heat conduction speed in the X direction, so that more heat can be gathered in the boss area 110, so that more heat can be transferred along the Y direction, so that the chassis 10 body is heated evenly.
[0043] It must be noted that, under the premise that the boss 111 is a structure that is larger on the outside and smaller on the inside, the cross-sectional shape of the boss 111 is not limited to a trapezoid.
[0044] As shown in FIG. 2 and FIG. 3 , a blank area 120 is further provided on the bottom surface of the chassis 10 . The blank area 120 is located between the first and last bosses 111 in the boss area 110 . The circumferential dimension of the blank area 120 is greater than the circumferential dimension of the circumferential gap 114 between adjacent bosses 111 .
[0045] The blank area 120 does not contact the heating tube 20, and there is a gap between the two. The blank area 120 receives a small amount of heat transferred by the heating tube 20 in the form of heat radiation. The blank area 120 does not transfer heat to the boss 111 of the chassis 10 along the X direction, thereby further reducing the heat transfer speed in the X direction, so that more heat is transferred along the Y direction through each boss 111 in the boss area 110, and finally the chassis 10 is evenly heated.
[0046] In some embodiments, in the axial direction of the chassis 10 , the thickness of the chassis 10 is 0.4 mm-0.8 mm; the thickness of the boss 111 in the axial direction of the chassis 10 is 0.4 mm-0.5 mm; and the circumference of the boss area 110 in the circumferential direction of the chassis 10 accounts for 73%-78%.
[0047] For each boss 111, they are distributed on a plurality of concentric circles with the center O of the chassis 10 as the center in the Y direction. The circumferential proportion of the boss area 110 in the circumference of the chassis 10 refers to: in the Z direction, in a concentric circle, the ratio of the arc length between the first and last bosses 111 to the circumference of the concentric circle.
[0048] Taking the example of aligning the outer periphery 112 of the boss area 110 with the outer circumference of the chassis 10 along the X direction, the concentric circle where the arc length between the first and last bosses 111 is located is the outer circumference of the chassis 10, and the circumferential proportion of the boss area 110 in the circumferential direction of the chassis 10 refers to: the ratio of the outer circumference of the chassis 10 between the first and last bosses 111 to the outer circumference of the entire chassis 10.
[0049] In the electric kettle, the thickness of the chassis 10 is generally 0.4mm-0.8mm, in order to comprehensively consider the structural size design requirements, heating efficiency, cost, etc. For this reason, the thickness of the boss 111 in the axial direction of the chassis 10 is set to 0.4mm-0.5mm; the boss area 110 accounts for 73%-78% of the circumference of the chassis 10 in the circumferential direction.
[0050] It has been verified through experiments that the above arrangement produces less noise during the water boiling process, indicating that the chassis 10 conducts heat evenly.
[0051] The test verification method includes: manually listening to the noise and comparing the noise peak with the existing design; or using a noise measuring device to measure, obtain the noise curve during the water boiling process, and compare the noise peak with the existing technology. If the noise peak is smaller, it means that the chassis 10 conducts heat more evenly.
[0052] Further, referring to Fig. 3, the circumferential gaps 114 between adjacent bosses 111 are equal, and the sum of the circumferential gaps 114 between adjacent bosses 111 accounts for 36.5%-39% of the circumference. The circumferential proportion here refers to the ratio of the sum of the sizes of the circumferential gaps 114 on the same circle to the circumference of the circle.
[0053] If the gap between adjacent bosses 111 is too close, it will not be able to insulate the temperature difference. If it is too wide, it will affect the thermal efficiency and cause a long heating time. Therefore, after testing, on the basis that the boss area 110 accounts for 73%-78% of the circumference of the chassis 10 in the circumferential direction, by controlling the size of the circumferential gap 114 between adjacent bosses 111, the boss 111 can increase the heat conduction capacity of the chassis 10 along the Y direction without affecting the heating efficiency when boiling water.
[0054] Optionally, the thickness of the chassis 10 is 0.4mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, and 0.8mm; the thickness of the boss 111 is 0.4mm, 0.42mm, 0.44mm, 0.45mm, 0.47mm, and 0.5mm; the circumference of the boss area 110 in the circumferential direction of the chassis 10 accounts for 73%, 73.9%, 74.2%, 74.6%, 75.5%, 76%, 76.6%, 77.2%, 77.6%, and 78%; the circumference of the sum of the circumferential gaps 114 between adjacent bosses 111 accounts for 36.5%, 36.9%, 37.3%, 37.8%, 38.2%, 38.7%, and 39%.
[0055] Exemplarily, the thickness of the chassis 10 is 0.5 mm; the thickness of the boss 111 is 0.45 mm; the boss area 110 accounts for 76.6% of the circumference of the chassis 10; and the sum of all circumferential gaps 114 between adjacent bosses 111 accounts for 38.35 of the circumference.
[0056] As shown in FIG1 , in some embodiments, the heating plate 100 further includes a heat-conducting plate 30, the heat-conducting plate 30 is connected to the bottom surface of the chassis 10, and the heating tube 20 is connected to the bottom surface of the heat-conducting plate 30. Preferably, the heat-conducting plate 30 is welded to the chassis 10, and the heat-conducting plate 30 is welded to the heating tube 20. By providing the heat-conducting plate 30, heat is first transferred to the heat-conducting plate 30, and then to the boss 111. In this way, black circles can be avoided on the top surface of the chassis 10 and the heating tube 20, which reduces the probability of damage and is more beautiful.
[0057] As shown in FIG. 4 , an electric kettle 1 provided in an embodiment of the second aspect of the present disclosure includes the heating plate 100 provided in the embodiment of the first aspect; FIG. 4 is a cross-sectional view of the electric kettle along its height direction in an embodiment of the present disclosure.
[0058] The electric water kettle comprises a kettle 200 for storing water. The bottom plate 10 of the heating plate 100 constitutes the bottom wall of the kettle 200. In addition, the bottom plate 1 can also be connected to the lower surface of the bottom wall of the kettle 200.
[0059] By providing a plurality of circumferentially spaced bosses 111, on the one hand, the area of the region on the chassis 10 that can directly transfer the heat of the heating tube 20 upward along the X direction is reduced, thereby slowing down the heat conduction speed of the heating plate 100 in the X direction. On the other hand, the bosses 111 increase the thickness of the chassis 10 in the X direction, thereby slowing down the heat transfer speed of the heating plate 100 in the X direction; thereby, more heat is transferred along the Y direction, so that the chassis 10 is heated evenly and the temperature is relatively uniform, so that the number of bubbles generated during the water boiling process is small and the speed is slow, thereby reducing the noise during the water boiling process.
[0060] In the present disclosure, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0061] In the present disclosure, unless otherwise clearly specified and limited, if there is a description that a first feature is "on" or "below" a second feature, etc., or the like, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0062] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this disclosure are for illustrative purposes only and do not represent the only implementation method.
[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0064] The above embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.
Claims
1. A heating plate of an electric kettle, characterized in that: include: A chassis, wherein a boss area is provided on the bottom surface of the chassis, and the boss area includes a plurality of bosses spaced apart along the circumference of the chassis; and A heating tube is connected to the chassis. The position of the heating tube corresponds to the boss area in the axial direction of the chassis. The heating tube is in direct or indirect contact with each boss.
2. The heating plate of the electric kettle according to claim 1, characterized in that: Along the radial direction of the bottom plate, the width of the boss area is greater than the width of the heating tube, and the outer circumference of the heating tube is aligned with the outer peripheral edge of the boss area in the axial direction of the bottom plate.
3. The heating plate of the electric kettle according to claim 1, characterized in that: The boss and the chassis are made of different materials, and the heat conductivity of the boss is greater than that of the chassis.
4. The heating plate of the electric kettle according to claim 1, characterized in that: The thickness of the boss in the axial direction of the chassis is smaller than the width of the boss in the radial direction of the chassis.
5. The heating plate of the electric kettle according to claim 1, characterized in that: The circumferential dimension of the boss tends to decrease radially inwardly of the chassis.
6. The heating plate of the electric kettle according to claim 1, characterized in that: A blank area is also provided on the bottom surface of the chassis, and the blank area is located between the first and last bosses in the boss area, and the circumferential dimension of the blank area is greater than the circumferential dimension of the circumferential gap between adjacent bosses.
7. The heating plate of the electric kettle according to claim 1, characterized in that: In the axial direction of the chassis, the thickness of the chassis is 0.4mm-0.8mm; the thickness of the boss in the axial direction of the chassis is 0.4mm-0.5mm; and the boss area accounts for 73%-78% of the circumference of the chassis in the circumferential direction.
8. The heating plate of the electric kettle according to claim 7, characterized in that: The circumferential gaps between adjacent bosses are equal, and the sum of all circumferential gaps between adjacent bosses accounts for 36.5%-39% of the circumference.
9. The heating plate of the electric kettle according to claim 1, characterized in that: The heating plate further comprises a heat-conducting plate, the heat-conducting plate is connected to the bottom surface of the base plate, and the heating pipe is connected to the bottom surface of the heat-conducting plate.
10. An electric kettle, characterized in that: include: Pot gall, used to store water; and The heating plate of the electric kettle as described in any one of claims 1 to 9, wherein the bottom plate constitutes the bottom wall of the kettle, or the bottom plate is fixed to the bottom surface of the bottom wall of the kettle.