Electric kettle

Abstract

The electric kettle is characterized in that the lower portion of a steam guide pipe is bent along with the outline of a first arc-shaped wall, the cold end of a heating pipe and the steam guide pipe are arranged in a staggered mode, the longitudinal section of the heating pipe is triangular, and the longitudinal section of the heating pipe comprises a second arc-shaped wall which extends along the first arc-shaped wall and is tightly attached to the first arc-shaped wall; the longitudinal section of the heating pipe further comprises a first straight wall extending in the horizontal direction and a second straight wall extending in the height direction, and the included angle between the first straight wall and the second straight wall is not smaller than 90 degrees so that the heating pipe can be away from the lower portion of the steam guide pipe. According to the electric kettle, on the premise that the contact area of the electric kettle and the bottom of the inner container is the same and the safety and the stability of the heating pipe are guaranteed, the thickness of the heating pipe is reduced, the distance between the heating pipe and the steam guide pipe is increased, and the melting possibility of the steam guide pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric kettles, in particular to an electric kettle. Background Art

[0002] In modern kitchen life, electric kettles are increasingly used. The electric kettle heats water through a heating tube, and the electric kettle transmits electrical energy to the heating tube through a coupler, while the steam conduit (usually made of plastic) is used to connect the inner pot and the coupler to ensure that the coupler can automatically cut off the power after the water in the electric kettle boils.

[0003] For example, in the prior art CN1065406C, an integrated wireless electrical connector and a thermal controller assembly for boiling water vessels is disclosed, wherein a connector strip is provided on one side of the coupler, and the electrical energy is connected to the wires of the heating tube through the connector strip. A bimetallic strip is provided on the other side of the coupler, and the steam conduit is connected to the bimetallic strip. When the water in the kettle is heated to boiling and a large amount of steam is generated, the bimetallic strip is deformed and automatically trips to cut off the power supply, thereby turning off the heating element to prevent the water from continuing to be heated or the kettle from drying out.

[0004] In actual use, the space inside the electric kettle is often small, so in order to smoothly install the coupler, the size of the coupler is often not large. Specifically, the bimetallic strip connected to the steam duct is closer to the center of the inner pot, and the deformation range of the bimetallic strip is limited. If the distance between the bimetallic strip and the center of the coupler is far, the coupler will not trip.

[0005] Therefore, the steam conduit needs to be bent when it is installed. During the bending process, the bending angle of the steam conduit cannot be greater than 90 degrees. The high-temperature water vapor will condense into condensed water and accumulate more and more because it cannot flow out smoothly, which is easy to block the steam channel, resulting in the phenomenon of water turning on but not powering off, and losing the steam protection function.

[0006] Therefore, the steam conduit is often connected to the bimetallic strip at an inward tilt, such as patent CN200920026935.1.

[0007] During the use of electric kettles, noise is a problem that users are more concerned about, especially for high-power electric kettles with a heating element (such as a heating tube) with a 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 high noise when boiling water in electric kettles, the existing technology often reduces the boiling power of electric kettles and reduces the bubble burst noise by reducing the bubble generation speed during boiling water. However, this solution prolongs the boiling time.

[0008] Another solution is to optimize the bottom wall structure of the inner pot, set a curved surface on the bottom wall of the inner pot, and set the heating element on the curved surface. The noise reduction principle of this method is that the bubbles generated on the inclined surface or curved surface during the heating process will slide along the 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.

[0009] 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.

[0010] However, for this type of electric kettle with a spherical bottom or an arc bottom, the steam duct also needs to be bent along the arc-shaped bottom wall of the inner pot. The bent steam duct is closer to the heating tube, and the heat from the heating tube can easily melt the steam duct, resulting in the inability of steam to flow from the steam duct to the coupler.

[0011] Furthermore, the heating tube and the connector strip of the coupler are connected by a wire. In order to reduce the length of the wire, the connecting end of the heating tube is often close to the connector strip of the coupler. The side of the heating tube with higher temperature away from the connecting end is close to the bimetallic strip and the steam conduit, making it easier to melt the steam conduit.

[0012] The longitudinal section of the existing heating tube is often a trapezoid (such as the prior art CN202311413612.9) or an acute triangle (such as the prior art CN201020268605.6). Under the same heating area, the trapezoidal heating tube and the acute triangle heating tube are thicker and are often closer to the steam conduit, which can easily cause the steam conduit to melt.

[0013] In addition, the heating tube includes a resistance wire, an insulating filler and an aluminum tube. A certain safety distance needs to be left between the resistance wire and the aluminum tube, and the heating tube structure also requires stability and processability. Therefore, the thickness of the heating tube cannot be simply and roughly reduced. Utility Model Content

[0014] The utility model aims to provide an electric kettle, which can solve the technical problem that, in arc-shaped inner pot electric kettles, the heating tube is too close to the steam conduit in the prior art under the same heating area, and the steam conduit is easy to melt, while ensuring the stability and safety of the heating tube structure.

[0015] The embodiment of the present application provides an electric kettle, wherein the inner pot comprises an inner pot bottom and an inner pot body extending from the upper edge of the inner pot bottom to the inner pot opening, wherein the inner pot bottom comprises a first arc-shaped wall extending upward and convex outward from the bottom,

[0016] The first curved wall is provided with a heating pipe, the inner side of the heating pipe is also provided with a coupler, and further includes a steam conduit located outside the inner liner for connecting the inner liner and the coupler, the lower part of the steam conduit is bent along the contour of the first curved wall, and the cold end of the heating pipe is staggered with the steam conduit;

[0017] The longitudinal section of the heating tube is triangular, and the longitudinal section of the heating tube includes a second arcuate wall extending along the first arcuate wall and closely attached to the first arcuate wall;

[0018] The longitudinal section of the heating tube further includes a first straight wall extending in the horizontal direction and a second straight wall extending in the height direction, and the angle between the first straight wall and the second straight wall is not less than 90 degrees, so that the heating tube is away from the lower part of the steam conduit.

[0019] In some embodiments of the present invention, the length of the first straight wall is the same as the length of the second straight wall.

[0020] In some embodiments of the present invention, the first straight wall is arranged horizontally.

[0021] In some embodiments of the present invention, an angle between the first straight wall and the second straight wall is equal to 90 degrees.

[0022] In some embodiments of the present invention, a first limiting wall is provided between the second curved wall and the first straight wall, and a second limiting wall is provided between the second curved wall and the second straight wall.

[0023] In some embodiments of the present invention, a heat insulation structure is provided between the heating pipe and the steam conduit.

[0024] In some embodiments of the present invention, the thermal insulation structure is thermal insulation cotton, and the thermal insulation cotton is adhered to the steam duct.

[0025] In some embodiments of the present invention, the second arc-shaped wall accounts for more than 35% of the circumference of the longitudinal section of the heating tube.

[0026] In some embodiments of the present invention, a heat conducting member is disposed on the outer side of the first arc-shaped wall, the heating tube is disposed on the outer wall of the heat conducting member, and the upper edge of the heat conducting member is lower than the upper edge of the first arc-shaped wall.

[0027] In some embodiments of the utility model, the inner liner bottom is made of a composite plate, the inner liner bottom includes a stainless steel layer and an aluminum layer, the aluminum layer is arranged on the outside of the stainless steel layer, the aluminum layer constitutes a heat conductor, and the heating tube is arranged on the outer wall of the heat conductor.

[0028] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0029] In this embodiment, a heating tube is arranged on the first arc-shaped wall of the inner pot bottom, which is conducive to reducing noise. The longitudinal section of the heating tube is triangular, and the angle between the first straight wall and the second straight wall is not less than 90 degrees. On the premise of keeping the contact area with the inner pot bottom the same and ensuring the safety and stability of the heating tube, the thickness of the heating tube is reduced, the distance between the heating tube and the steam conduit is increased, and the possibility of melting of the steam conduit is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the electric kettle inner container of an embodiment of the present application.

[0031] Figure 2 It is a schematic diagram of the structure of the inner tank body, heat conducting member and coupler of the electric kettle according to an embodiment of the present application.

[0032] Figure 3 It is a schematic diagram of the structure of the inner tank of the heating tube according to an embodiment of the present application.

[0033] Icons: 1-bottom of inner tank, 101-heat conducting part, 102-insulating structure, 2-inner tank body, 3-coupler, 301-bimetallic strip, 302-connector strip, 4-steam duct, 5-heating tube, 501-connecting terminal, 502-wire, 51-second curved wall, 52-first straight wall, 53-second straight wall, 54-first limiting wall, 55-second limiting wall. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] First, the heating pipe 5 is arranged on the first convex arc wall, which is helpful to reduce noise, but the steam conduit 4 and the heating pipe 5 are too close.

[0036] In order to heat water faster, existing electric kettles generally use a heating element 3 with a power between 1500W and 2000W according to the capacity. For example, 1500W is used for a capacity of 1.5L and 1800W is used for a capacity of 1.7L. The faster boiling speed causes a large number of bubbles to be generated on the inner surface of the inner pot. The noise generated by the bursting of the bubbles is relatively large, up to 70 decibels, which greatly affects the user experience.

[0037] In order to reduce noise, the bottom 1 of the inner pot of the electric kettle includes a first curved wall extending upward from the bottom and convex outward, and the first curved wall is provided with a heating tube 5, and the longitudinal section of the heating tube 5 includes a second curved wall 51 extending along the first curved wall and closely attached to the first curved wall. When the heating tube 5 is in operation, the temperature at the first curved wall of the inner pot bottom 1 is higher, and it is easier to generate bubbles on the first curved wall. When the bubbles move along the curved surface, small bubbles will gather into large bubbles, which increases the volume of the bubbles and reduces the frequency of bubble rupture, which can effectively reduce the noise generated when the electric kettle boils water.

[0038] In actual application of the above inner liner, one is that the inner liner bottom 1 and the inner liner body 2 are directly integrally formed, and the other is that the inner liner bottom 1 and the inner liner body 2 are connected to form a receiving cavity for holding liquid. Among them, the inner liner bottom 1 can include at least two implementations.

[0039] In the first embodiment, a heat conductor 101 is provided on the outside of the first curved wall, and a heating element is welded on the periphery of the heat conductor 101. The heat conductor 101 and the first curved wall can be connected by welding, in order to improve the heat transfer efficiency between the heat conductor 101 and the first curved wall and reduce the noise caused by the cold welding. The upper edge of the heat conductor 101 is lower than the upper edge of the first curved wall, and the heating element is fixed around the outer wall of the heat conductor 101 opposite to the first curved wall. In this way, the heat generated by the heating element is evenly transferred to the bottom 1 of the inner pot through the heat conductor 101, which can avoid the vibration of the inner pot caused by the local temperature being too high, and can slow down the speed of the bubble separation; in addition, the thermostat is generally installed on the heat conductor 101 of the bottom 1 of the inner pot. If the heat conductor 101 is set too high, the heat generated by the heating element is easy to spread to the surroundings through the heat conductor 101, 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.

[0040] In the second embodiment, the inner liner bottom 1 is made of a composite plate, and the inner liner bottom 1 includes a stainless steel layer and an aluminum layer. The aluminum layer is arranged on the outside of the stainless steel layer, and the aluminum layer constitutes a heat conductor 101. The heating tube 5 is arranged on the outer wall of the heat conductor 101, thereby improving the uniformity of thermal conductivity of the inner liner bottom 1.

[0041] In addition, a coupler 3 and a steam conduit 4 are also provided on the outside of the inner pot. The coupler 3 can be arranged on the inner pot bottom 1, and the steam conduit 4 extends from the upper side of the inner pot body 2 to the bimetallic strip 301 of the coupler 3. Terminals 501 are also provided at both ends of the heating tube 5. The cold end of the heating tube 5 is between the two terminals 501. The terminal 501 of the heating tube 5 is connected to the connector strip 302 of the coupler 3 through a wire 502. In order to reduce the length of the wire 502, the terminal 501 of the heating tube 5 is often close to the connector strip 302 of the coupler 3. The cold end of the heating tube 5 is staggered with the above-mentioned steam conduit 4. Then, the side of the heating tube 5 that is higher in temperature and away from the connection end is close to the bimetallic strip 301 and the steam conduit 4, and the steam conduit 4 is easily melted. For the inner pot bottom 1 with a convex first arc wall, the steam conduit 4 of the inner pot bottom 1 needs to bend along the contour of the above-mentioned first arc wall, which causes the steam conduit 4 to be too close to the heating tube 5.

[0042] Second, the longitudinal section of the heating tube 5 is triangular, which can improve the heating efficiency and noise reduction performance, and also increase the distance between the heating tube 5 and the steam conduit 4.

[0043] For the heating tube 5 , the shape of the trapezoidal cross-section heating tube 5 is relatively regular, and compared with the triangular cross-section heating tube 5 , it has no sharp corners, and may be relatively easy to manufacture, and easy to position and install with the inner tank.

[0044] However, the existing trapezoidal heating tube 5 is not as good as the triangular cross-section heating tube 5 in terms of heat transfer. For a closed longitudinal section with a given perimeter, the cross-sectional length of the second arc-shaped wall 51 in the triangular cross-section heating tube 5 is longer, and the contact area with the first arc-shaped wall of the inner pot bottom 1 is larger. For the heating tube 5 with the same power, a larger heating area often means that the heat is more evenly distributed on the first arc-shaped wall and the second arc-shaped wall 51, and the power density per unit area is lower, which reduces the temperature difference of the heated area of ​​the first arc-shaped wall and prevents small bubbles from bursting before they converge into large bubbles.

[0045] In addition, under the same circumference condition, the cross-sectional length of the second arc-shaped wall 51 in the trapezoidal heating tube 5 will be restricted by the length of the top edge and the length of the oblique edges on both sides. Therefore, to achieve the same contact area, the trapezoidal heating tube 5 needs a larger longitudinal cross-sectional circumference, thereby increasing the thickness of the trapezoidal heating tube 5 and making it closer to the steam conduit 4, further increasing the risk of the steam conduit 4 melting.

[0046] Therefore, in this embodiment, the longitudinal section of the heating tube 5 is triangular.

[0047] 3. Under the same heating area as the inner pot bottom 1, the heating tube 5 with an obtuse triangle cross section and a right triangle cross section is farther away from the steam conduit 4 than the heating tube 5 with an acute triangle cross section.

[0048] The main body of the longitudinal section of the heating tube 5 includes a first straight wall 52, a second straight wall 53 and a second arcuate wall 51. The angle between the first straight wall 52 and the second straight wall 53 is not less than 90 degrees, so that the longitudinal section of the entire heating tube 5 is an obtuse triangle or a right triangle.

[0049] Under the condition of the same perimeter, the long sides of the obtuse triangle section and the right triangle section are longer, thereby increasing the contact area between the second arc wall 51 and the first arc wall, and also improving the heat transfer efficiency. The second arc wall 51 accounts for more than 35% of the perimeter of the longitudinal section of the heating tube 5. Further, the heating tube 5 with the obtuse triangle section and the right triangle section is thinner, and is farther away from the thinner steam conduit 4 than the heating tube 5 with the acute triangle section. Obtuse angles and right angles will cause the height of the triangle to be relatively low, because the side opposite to the obtuse angle (usually as the base) is longer, making the height line (the vertical line from the vertex to the base) relatively short. Acute triangles usually have higher heights, especially if it is close to the shape of an isosceles or equilateral triangle. The base of an acute triangle is shorter, and the relative height is higher.

[0050] The heating tube 5 with an obtuse triangle cross section and a right triangle cross section has enough space near its obtuse angle and right angle to accommodate the heating wire and leave enough safety distance, thereby ensuring the safety and reliability of the heating tube 5 in this embodiment.

[0051] In summary, in the arc-shaped inner pot electric kettle, this embodiment adopts a heating tube 5 with a triangular longitudinal section, and the angle between the first straight wall 52 and the second straight wall 53 of the heating tube 5 is not less than 90 degrees. Under the premise of ensuring safety and reliability, this embodiment can further increase the contact area of ​​the inner pot compared to the trapezoidal heating tube 5 and the acute-angled triangular heating tube 5, improve the noise reduction effect of the electric kettle, and also alleviate the problem that the heating tube 5 is too close to the steam conduit 4, causing the steam conduit 4 to melt.

[0052] During the specific implementation process, it was found that in the arc-shaped inner pot electric kettle, the isosceles triangle and scalene triangle heating tubes 5 have different characteristics and heat transfer properties.

[0053] The isosceles triangle heating tube 5 has symmetry, which is helpful for design and manufacturing, and is more stable in force. The first straight wall 52 and the second straight wall 53 on the surface of the heating tube 5 have relatively consistent heat transfer effects on the second curved wall 51, so that the entire triangular heating tube 5 remains stable when heated, and the resistance wire of the heating tube 5 and the convenience of the heating tube 5 are more easily guaranteed. The unequal-sided triangle can better adapt to spaces of different sizes and structures, but the processing difficulty is relatively large.

[0054] In combination with the second curved wall 51 of the heating tube 5 in this embodiment, it is necessary to fit the first curved wall. The processing difficulty of the second curved wall 51 is relatively high. Therefore, in this embodiment, the length of the first straight wall 52 is preferably the same as that of the second straight wall 53, and an isosceles triangle structure is adopted.

[0055] The difficulty of installing the heating tube 5 on the curved inner bottom 1 is often the positioning of the heating tube 5. In the prior art, a plurality of flanges are generally stamped out on the heat conducting member 101 of the inner bottom 1, and the flanges can limit the displacement of the heating tube 5 on the first curved wall, thereby achieving the installation and positioning of the heating tube 5.

[0056] However, the edges of the existing trapezoidal heating tube 5 and the acute triangle heating tube 5 are often sharp corners. When the heating tube 5 is installed, the corner directly contacts the flange, and the contact area is small. During the long-term use of the electric kettle, the heating tube 5 and the inner pot bottom 1 are repeatedly heated, and the stress on the corner of the heating tube 5 and the flange of the inner pot bottom 1 increases, which may cause the heating tube 5 to be damaged.

[0057] In order to solve the above problems, in some implementations of the present embodiment, a vertical first limiting wall 54 is provided between the second curved wall 51 and the first straight wall 52, and a horizontal second limiting wall 55 is provided between the second curved wall 51 and the second straight wall 53. The first limiting wall 54 and the second limiting wall 55 make the angle of the triangular heating tube 5 more gentle, and can also increase the contact area with the flanges at different positions, thereby facilitating the installation and positioning of the heating tube 5, and also helping to improve the structural stability of the heating tube 5 in long-term use. At the same time, the first limiting wall 54 and the second limiting wall 55 make the structure of the heating tube 5 more regular, which is further conducive to the processing and manufacturing of the heating tube 5.

[0058] In order to further improve the manufacturing efficiency of the heating tube 5 and reduce the manufacturing difficulty, in some implementations of the present embodiment, the above-mentioned first straight wall 52 is arranged horizontally to facilitate mold demolding, enhance the manufacturability of mass production of the heating tube 5 components, and also facilitate the installation and positioning of the triangular heating tube 5 in the arc-shaped inner tank.

[0059] In some implementations of this embodiment, the angle between the first straight wall 52 and the second straight wall 53 may also be equal to 90 degrees, so that the first straight wall 52 and the second straight wall 53 are perpendicular to each other, and its regular structure further facilitates improving the manufacturing efficiency of the heating tube 5.

[0060] On the other hand, in order to further reduce the probability of the steam conduit 4 melting, in some implementations of this embodiment, a heat insulation structure 102 is provided between the heating pipe 5 and the steam conduit 4. Specifically, the position of the bracket or buckle used to install the steam conduit 4 can be moved between the heating pipe 5 and the steam conduit 4. Heat insulation materials such as aerogel can also be installed between the heating pipe 5 and the steam conduit 4.

[0061] Furthermore, the thermal insulation structure 102 may be thermal insulation cotton, one side of which may be adhered to the side of the steam conduit 4 close to the heating pipe 5 by glue or double-sided tape, and the thermal insulation cotton may also be wrapped or sleeved on the steam conduit 4 to further improve the safety of the steam conduit 4.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric kettle, comprising an inner container for containing liquid, characterized in that: The inner liner comprises an inner liner bottom and an inner liner body extending from the upper edge of the inner liner bottom to the inner liner opening, and the inner liner bottom comprises a first arc-shaped wall extending upward and convex outward from the bottom. The first arc-shaped wall is provided with a heating pipe, the inner side of the heating pipe is also provided with a coupler, and further comprises a steam conduit located outside the inner liner for connecting the inner liner and the coupler, the lower part of the steam conduit is bent along the contour of the first arc-shaped wall, and the cold end of the heating pipe is staggered with the steam conduit; The longitudinal section of the heating tube is triangular, and the longitudinal section of the heating tube includes a second arc-shaped wall extending along the first arc-shaped wall and closely attached to the first arc-shaped wall; The longitudinal section of the heating pipe also includes a first straight wall extending in the horizontal direction and a second straight wall extending in the height direction, and the angle between the first straight wall and the second straight wall is not less than 90 degrees, so that the heating pipe is away from the lower part of the steam conduit.

2. An electric kettle according to claim 1, characterized in that: The length of the first straight wall is the same as the length of the second straight wall.

3. The electric kettle according to claim 1, characterized in that: The first straight wall is arranged horizontally.

4. The electric kettle according to claim 1, characterized in that: The included angle between the first straight wall and the second straight wall is equal to 90 degrees.

5. The electric kettle according to claim 1, characterized in that: A vertical first limiting wall is provided between the second arc-shaped wall and the first straight wall, and a horizontal second limiting wall is provided between the second arc-shaped wall and the second straight wall.

6. The electric kettle according to claim 1, characterized in that: A heat insulation structure is arranged between the heating pipe and the steam conduit.

7. An electric kettle according to claim 6, characterized in that: The heat insulation structure is heat insulation cotton, and the heat insulation cotton is adhered to the steam conduit.

8. The electric kettle according to claim 1, characterized in that: The second arc-shaped wall accounts for more than 35% of the circumference of the longitudinal section of the heating tube.

9. The electric kettle according to claim 1, characterized in that: A heat conducting member is disposed on the outer side of the first arc-shaped wall, the heating tube is disposed on the outer wall of the heat conducting member, and the upper edge of the heat conducting member is lower than the upper edge of the first arc-shaped wall.

10. The electric kettle according to claim 1, characterized in that: The inner liner bottom is made of a composite plate, and the inner liner bottom includes a stainless steel layer and an aluminum layer, wherein the aluminum layer is arranged outside the stainless steel layer, the aluminum layer constitutes a heat conducting member, and the heating pipe is arranged on the outer wall of the heat conducting member.

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