CN108784336B - Electric kettle - Google Patents
Electric kettle Download PDFInfo
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- CN108784336B CN108784336B CN201710294739.1A CN201710294739A CN108784336B CN 108784336 B CN108784336 B CN 108784336B CN 201710294739 A CN201710294739 A CN 201710294739A CN 108784336 B CN108784336 B CN 108784336B
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- bottom wall
- kettle
- thermal conductivity
- heating element
- conductivity material
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/21—Water-boiling vessels, e.g. kettles
- A47J27/21008—Water-boiling vessels, e.g. kettles electrically heated
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/21—Water-boiling vessels, e.g. kettles
- A47J27/21166—Constructional details or accessories
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Cookers (AREA)
Abstract
The invention discloses an electric kettle, which comprises a kettle bottom wall (1) and a heating element (4), wherein a convex part (11) protruding upwards is formed on the top surface of the kettle bottom wall, a groove which is concave into the convex part from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall, a low-thermal-conductivity-coefficient material with the thermal conductivity not more than 40W/m.k is filled in the groove to form a low-thermal-conductivity-coefficient material layer (9), and the heating element is annularly and spirally arranged right below the low-thermal-conductivity-coefficient material layer. In the electric kettle, the groove in the kettle bottom wall is filled with the low-thermal-conductivity-coefficient material which is positioned right above the heating element, so that the heat conduction along the thickness direction of the kettle bottom wall can be slowed down, the wall surface superheat degree of the kettle bottom wall can be reduced, the transverse heating of the kettle bottom wall is uniform, the phenomenon that local bubbles on the kettle bottom wall are small and dense can be effectively avoided, and the remarkable noise reduction effect is achieved.
Description
Technical Field
The invention belongs to the field of household appliances, and particularly relates to an electric kettle.
Background
The kettle bottom wall of conventional insulating pot adopts horizontal kettle diapire more, and the electric plate is installed in the bottom surface of horizontal kettle diapire, directly heats horizontal kettle diapire, and then heats the liquid water in the insulating pot. Wherein, the heat source of the electric heating plate comes from the electric heating pipe, and the electric heating pipe is used for carrying out centralized heating on the bottom wall of the horizontal kettle so as to heat the liquid in the kettle.
When the electric kettle works, the electric heating tube conducts heat to the bottom wall of the kettle in a contact heat conduction mode, the contact area is small, the superheat degree of a heat contact area of the bottom wall of the kettle and the electric heating tube is large, so that bubbles generated in the heat contact area are small, the separation frequency is high, the small bubbles separated from the bottom wall of the kettle can transfer the heat of the small bubbles to peripheral liquid in the rising process, the small bubbles are easy to break due to heat loss, and large noise is generated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the electric kettle which can effectively reduce the frequency of bubbles breaking away from the bottom wall of the kettle, thereby reducing the frequency of bubbles breaking in water and achieving the effect of noise reduction.
In order to achieve the above object, the present invention provides an electric kettle, comprising a kettle bottom wall and a heating element, wherein the top surface of the kettle bottom wall is formed with a convex part which is convex upwards, the bottom surface of the kettle bottom wall is correspondingly formed with a groove which is concave into the convex part from the bottom surface, the groove is filled with a low thermal conductivity material with a thermal conductivity not more than 40W/m-k so as to form a low thermal conductivity material layer, and the heating element is annularly and spirally arranged right below the low thermal conductivity material layer.
Preferably, the thermal conductivity of the low thermal conductivity material layer is not more than 20W/m-k, and the thickness of the low thermal conductivity material layer is not less than 0.5mm and not more than 2 mm.
Preferably, the low thermal conductivity material layer is a mica layer or a ceramic layer.
Preferably, the bottom surface of the kettle bottom wall is flush with the bottom surface of the low thermal conductivity material layer.
Preferably, the bulge is formed by stamping, and a corresponding stamping groove is formed on the bottom surface of the kettle bottom wall.
Preferably, the top surface of the kettle bottom wall is provided with a circular ring area for arranging the bulge;
the annular heating element is arranged in the annular region, a plurality of protrusions are arranged in the annular region, the protrusions are spaced from one another along the circumferential direction, the protrusions are radial linear protrusions extending along the radial direction, and the annular heating element is arranged concentrically with the annular region;
or a plurality of linear bulges which extend along the chord line direction and are spaced in parallel are arranged in the annular region, and the annular heating element and the annular region are arranged concentrically;
alternatively, the projection is an annular projection, the annular heating element being arranged concentrically with the annular projection.
Preferably, the inner periphery of the layer of low thermal conductivity material is no greater than the inner periphery of the heating element and the outer periphery of the layer of low thermal conductivity material is no less than the outer periphery of the heating element.
Preferably, the low thermal conductivity material layer is arranged concentrically with the heating element, the low thermal conductivity material layer has a loop width not smaller than a loop width of the heating element and a ratio of loop width values not smaller than 1 and not larger than 2.
Preferably, the inner periphery of the layer of low thermal conductivity material is larger than the inner periphery of the heating element and the outer periphery of the layer of low thermal conductivity material is smaller than the outer periphery of the heating element.
Preferably, the low thermal conductivity material layer is concentrically arranged with the heating element, the ring width of the low thermal conductivity material layer is smaller than that of the heating element and the ratio of the ring width values is not less than 0.5 and less than 1.
Preferably, the protrusion is an annular protrusion formed in a first fan-shaped ring shape having a first arc cutout, the contact heating area of the heating element at the bottom surface of the kettle bottom wall is formed in a second fan-shaped ring shape having a second arc cutout, and an arc angle of the first arc cutout is smaller than an arc angle of the second arc cutout.
Preferably, the electric kettle further comprises a base plate located between the kettle bottom wall and the heating element, the base plate being a high thermal conductivity metal plate having a thermal conductivity of not less than 100W/m-k.
According to the technical scheme, the protruding part protruding upwards is formed on the top surface of the kettle bottom wall, the groove recessed into the protruding part from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall, the low-thermal-conductivity-coefficient material with the thermal conductivity not more than 40W/m.k is filled in the groove to form the low-thermal-conductivity-coefficient material layer, and the heating element is annularly and spirally arranged right below the low-thermal-conductivity-coefficient material layer, so that the thickness of the thermal contact area is increased, the heat conduction along the thickness direction of the kettle bottom wall is slowed down, the wall surface superheat degree of the kettle bottom wall is favorably reduced, the kettle bottom wall is uniformly heated in the transverse direction, the phenomenon that local bubbles on the kettle bottom wall are small and dense can be effectively avoided, and the remarkable noise reduction effect is achieved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a front view of an electric kettle of the present invention;
fig. 2 is an overall sectional view of an electric kettle according to a first preferred embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 2;
fig. 4 is an overall sectional view of an electric kettle according to a second preferred embodiment of the present invention;
FIG. 5 is an enlarged view of portion B of FIG. 4;
FIG. 6 is a top view of the bottom wall of the pitcher of the present invention having a protrusion formed on the top surface thereof, wherein the protrusion is annular;
FIG. 7 is a top view of the bottom wall of the kettle of the present invention with a protrusion formed on the top surface thereof, wherein the protrusion is in the shape of a fan ring;
FIG. 8 is a top view of the bottom wall of the pitcher of the present invention having a protrusion formed on the top surface thereof, wherein the protrusion is a radial linear protrusion;
FIG. 9 is a top view of the bottom wall of the kettle of the present invention with a protrusion formed on the top surface thereof, wherein the protrusion is a linear protrusion;
FIG. 10 is an overall cross-sectional view of a prior art electric kettle;
FIG. 11 is a bottom view of the prior art electrical heating tube installed on the bottom of the kettle bottom wall;
FIG. 12 is a schematic view showing bubbles on the top surface of the bottom wall of the kettle when the electrothermal tube is mounted on the bottom wall of the kettle in the prior art;
FIG. 13 is a schematic view of the vapor bubble on the top surface of the bottom wall of the kettle when the cavity in the bottom wall of the kettle of the present invention is filled with a material having a low thermal conductivity.
Description of reference numerals:
1 kettle bottom wall 5 outer casing
11 bulge 6 handle
2 kettle body 7 steam pipe
3 pot lid 8 base plate
4 heating element 9 Low thermal conductivity Material layer
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like are generally described with respect to the orientation shown in the drawings or the positional relationship of the components with respect to each other in the vertical, or gravitational direction.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, the invention provides an electric kettle, which comprises a kettle bottom wall 1, a kettle body 2 and a kettle cover 3, wherein the kettle bottom wall 1 forms a kettle body, a heating element 4 used for heating liquid in the kettle is installed at the bottom of the kettle bottom wall 1, a shell 5 is arranged around the outer side of the kettle body, a handle 6 is connected onto the shell 5, a steam pipe 7 is arranged in the kettle body and the handle 6 or between the kettle body and the shell 5, a temperature controller is arranged at the bottom of the kettle body, the steam pipe 7 guides steam in the kettle body to the temperature controller, when the temperature controller detects that the temperature of the steam reaches a preset value, a bimetallic strip deforms to cut off the power supply of the heating element 4, or a temperature sensor is arranged on the kettle body, and when the temperature sensor detects that the temperature in the kettle.
In the electric kettle in the prior art, referring to fig. 11, an electric heating tube for heating liquid in the kettle is arranged on the bottom surface of the kettle bottom wall 1, and in the whole heating process of the electric kettle, the electric heating tube conducts the heat of the electric heating tube to the bottom surface of the kettle bottom wall 1 in a contact heat conduction mode, and the heat contact area is annular and has a small area, so that the heat flow density of the heat contact area between the kettle bottom wall 1 and the electric heating tube is large, and the superheat degree of the heat contact area is also large. Specifically, the larger the superheat degree of the thermal contact area between the kettle bottom wall 1 and the electric heating tube is, the larger the evaporation power generated by the gas generated after the liquid is gasified to supplement the vapor bubble, the larger the vertical upward lifting force given by the gas to the vapor bubble is, and further the small vapor bubble is separated from the kettle bottom wall 1 when growing unevenly, so that when the liquid in the kettle is heated by the electric heating tube arranged on the bottom surface of the kettle bottom wall 1, the vapor bubble generated on the kettle bottom wall 1 is difficult to grow and the frequency of separating from the kettle bottom wall 1 is higher, so that the vapor bubble separated from the kettle bottom wall 1 and entering the water is small and dense, see fig. 12, and the small vapor bubble is also easy to break in the water due to heat loss in the rising process, and generates a large noise.
In view of the above, in order to reduce the degree of superheat of the wall surface of the thermal contact region on the bottom wall 1 of the kettle, so as to make the bottom wall 1 of the kettle heated more uniformly, thereby avoiding the phenomenon of small and dense local bubbles on the bottom wall 1 of the kettle, and achieving the effect of noise reduction, referring to fig. 2 and 3, in the electric kettle of the present invention, the bottom wall 1 of the kettle comprises a bottom wall 1 of the kettle and a heating element 4, an upwardly convex protrusion 11 is formed on the top surface of the bottom wall 1 of the kettle, a groove is correspondingly formed on the bottom surface of the bottom wall 1 of the kettle, the groove is recessed into the protrusion 11 from the bottom surface, a low thermal conductivity material with a thermal conductivity not greater than 40W/m · k is filled in the groove to form a low thermal conductivity material layer 9, and the. So set up, can make heating element 4's heat earlier upwards conduct to kettle bottom wall 1 through the low coefficient of heat conductivity material layer 9 that coefficient of heat conductivity is not more than 40W/m.k, then heat through the liquid water in the kettle of kettle bottom wall 1 in to the kettle again, so not only the thickness of heat-conduction has been bodied, heat transfer distance increases promptly, still can utilize the low coefficient of heat conductivity of this low coefficient of heat conductivity material layer 9, further slow down the heat conduction along kettle bottom wall 1 thickness direction, thereby be favorable to the horizontal heat balance of kettle bottom wall 1, reduce the wall superheat degree of kettle bottom wall 1. Specifically, the degree of superheat of the wall surface of the kettle bottom wall 1 is reduced, so that the evaporation power generated after gas generated by liquid gasification enters steam bubbles is reduced, correspondingly, the vertical upward lifting force given to the steam bubbles by the gas is reduced, and further the steam bubbles can grow into larger steam bubbles on the kettle bottom wall 1 and then are separated from the kettle bottom wall 1, see fig. 13, so that the frequency of the steam bubbles separating from the kettle bottom wall 1 can be effectively reduced, the frequency of the steam bubbles breaking in water is reduced, the noise value of the electric kettle during operation is reduced, and a remarkable noise reduction effect is achieved.
The low thermal conductivity material layer 9 may be made of any suitable material, such as a mica layer or a ceramic layer, and the thermal conductivity thereof should not be greater than 40W/m · k. Further, in order to make the heat conduction in the thickness direction of the kettle bottom wall 1 slower, the heat conductivity coefficient of the low heat conductivity material layer 9 is preferably not more than 20W/m · k. In addition, the thickness of the low thermal conductivity material layer 9 should be not less than 0.5mm and not more than 2 mm. It can be understood that the thicker the low thermal conductivity material layer 9 is, the slower the heat conduction along the thickness direction of the kettle bottom wall 1 is, the smaller the degree of superheat of the wall surface of the kettle bottom wall 1 is, which is more beneficial for noise reduction, but when the thickness of the kettle bottom wall 1 exceeds a certain value, the temperature of the heating area of the top surface of the kettle bottom wall 1 right above the heating element 4 is lower than the temperature of the periphery, which may increase the degree of superheat reversely, and the larger the thickness is, the lower the heat transfer efficiency is; the layer of low thermal conductivity material 9 should not be too thin, and thinner layers will greatly diminish the effectiveness of the low thermal conductivity material layer 9 in slowing down longitudinal heat transfer and increasing transverse heat transfer.
In addition, the bulge part 11 formed on the top surface of the kettle bottom wall 1 is formed by stamping, the corresponding stamping groove is formed on the bottom surface of the kettle bottom wall 1, and the kettle bottom wall 1 with the bulge part 11 formed by stamping has the characteristics of simple manufacturing process, high rigidity, long service life and the like.
Specifically, the annular heating element 4 may be of various suitable types, such as an electric heating tube disposed below the kettle bottom wall 1, an electric heating film (i.e. infrared electric heating film) or a thick film attached to the bottom surface of the kettle bottom wall 1, or a coil panel or a PTC heating plate disposed below the kettle bottom wall 1. However, the electric heating tube generally conducts heat in a contact heat conduction mode, the heat contact area with the kettle bottom wall 1 is small, compared with other heating elements 4, the electric heating tube is more prone to uneven heat conduction to the kettle bottom wall 1 in the heating process due to the characteristics of the structure of the electric heating tube and the heat conduction mode, the superheat degree of part of the top surface of the kettle bottom wall 1 is higher, small and dense bubbles are generated on the partial top surface of the kettle bottom wall 1, and therefore the electric kettle is prone to generating larger noise in work, and after the technical scheme of the invention is adopted by the corresponding electric kettle heated by the electric heating tube, noise reduction can be better improved.
Referring to fig. 2 and 3, the electric heating tube may be directly welded to the bottom of the kettle bottom wall 1 (i.e. the electric heating tube is disposed on the bottom surface of the low thermal conductivity material layer 9), or may be fixedly connected to the bottom surface of the kettle bottom wall 1 (i.e. the electric heating tube is disposed right below the low thermal conductivity material layer 9) by welding or fastening through the substrate 8. Generally, the electric heating tube, the base plate 8 and the kettle bottom wall 1 are preferably connected by soldering. The substrate 8 is usually a high thermal conductivity metal plate with a thermal conductivity not less than 100W/m · k, such as a copper plate, an aluminum plate, etc., and the heat conduction in the thickness direction is fast, which facilitates the installation of the electric heating tube, but does not affect the heat transfer of the electric heating tube. As is well known to those skilled in the art, the substrate 8 is usually provided with a dry-burning prevention sheet thereon for the purpose of preventing dry burning.
In addition, with continued reference to fig. 2 and fig. 3, the bottom surface of the low thermal conductivity material layer 9 is preferably flush with the bottom surface of the kettle bottom wall 1, i.e. the depth of the groove is the same as the thickness of the low thermal conductivity material layer 9, so that the arrangement is not only convenient for the heating element 4 to be stably and flatly mounted at the bottom of the kettle bottom wall 1 (i.e. the bottom surface of the low thermal conductivity material layer 9), but also when the base plate 8 is additionally arranged between the kettle bottom wall 1 and the heating element 4, the top surface of the base plate 8 can be tightly attached to the peripheral and middle regions of the bottom surface of the kettle bottom wall 1, thereby facilitating the.
Specifically, the heating element 4 is annular, in order to reduce the degree of superheat of the wall surface of the kettle bottom wall 1, a protrusion 11 for filling a low thermal conductivity material is provided directly above the annular heating element 4, the arrangement form of the protrusion 11 on the top surface of the kettle bottom wall 1 may be various, for example, an annular region for arranging the protrusion 11 is provided on the top surface of the kettle bottom wall 1, a plurality of protrusions 11 spaced from each other in the circumferential direction are provided in the annular region, the protrusion 11 is a radial linear protrusion extending in the radial direction, and the annular heating element 4 is arranged concentrically with the annular region, see fig. 8; the arrangement area of the convex part 11 on the top surface of the kettle bottom wall 1 can be a circular ring area, a plurality of linear convex parts which extend along the chord line direction and are spaced in parallel are arranged in the circular ring area, and the annular heating element 4 is arranged concentrically with the circular ring area, as shown in fig. 9; it is also possible that the protrusion 11 is an annular protrusion (the annular protrusion includes the protrusion 11 in a circular ring shape and the protrusion 11 in a sector ring shape), and the annular heating element 4 is arranged concentrically with the annular protrusion, refer to fig. 6 and 7; of course, other setting forms are also possible, and are not described in detail herein. The radial linear protrusion is in a sector ring shape, and a central angle of the sector ring-shaped radial linear protrusion is not particularly limited, for example, the central angle may be 10 °, 30 °, or 45 °, which depends on actual process requirements. Further, the width of the linear protrusion is not particularly limited.
Specifically, referring to fig. 2 and 3, the inner circumference of the low thermal conductivity material layer 9 is not larger than the inner circumference of the heating element 4, and the outer circumference of the low thermal conductivity material layer 9 is not smaller than the outer circumference of the heating element 4, i.e., the loop width of the heating element 4 is not larger than the loop width of the low thermal conductivity material layer 9. So set up, on having slowed down the heat-conduction's of following kettle diapire 1 thickness direction the basis, still increased the horizontal heated area of kettle diapire 1, make the horizontal of kettle diapire 1 be heated more evenly, be favorable to falling the noise.
Wherein the low thermal conductivity material layer 9 is arranged concentrically with the heating element 4, the ring width of the low thermal conductivity material layer 9 is not less than the ring width of the heating element 4 and the ratio of the ring width values should be not less than 1 and not more than 2. Specifically, the larger the ratio of the width of the low thermal conductivity material layer 9 to the width of the heating element 4 is, the larger the width of the low thermal conductivity material layer 9 is, which is more beneficial to slow down the heat conduction along the transverse direction of the kettle bottom wall 1, and the more obvious the noise reduction effect is, but the heat transfer efficiency is reduced. Of course, the ratio of the width values of the low thermal conductivity material layer 9 to the width values of the heating elements 4 should not be larger than 2, and specifically, after the ratio of the width values of the low thermal conductivity material layer 9 to the width values of the heating elements 4 exceeds a certain value, the width of the low thermal conductivity material layer 9 is increased, which is also beneficial to reducing the heat conduction along the transverse direction of the kettle bottom wall 1, but has little influence on the superheat degree of the wall surface of the kettle bottom wall 1 far away from the heating elements 4, and the noise reduction effect is not good. In addition, the larger the loop width of the low thermal conductivity material layer 9 is, the lower the heat transfer efficiency is, and the more the material required for producing the low thermal conductivity material layer 9 is, the more the production cost is increased, so that, considering the influence of the loop width of the low thermal conductivity material layer 9 on the noise reduction effect, the heat transfer efficiency and the production cost in combination, the ratio of the loop width value of the low thermal conductivity material layer 9 to the loop width value of the heating element 4 is preferably not more than 2, though of course not limited thereto.
Of course, referring to fig. 4 and 5, when the inner circumference of the low thermal conductivity material layer 9 is larger than the inner circumference of the heating element 4, and the outer circumference of the low thermal conductivity material layer 9 is smaller than the outer circumference of the heating element 4, the purpose of slowing down the heat conduction along the thickness direction of the kettle bottom wall 1 can be also met, that is, the electric kettle of the present invention adopts the technical scheme, the purpose of reducing the degree of superheat of the wall surface of the kettle bottom wall 1 can also be achieved, and noise reduction is facilitated.
Wherein, low coefficient of thermal conductivity material layer 9 and heating element 4 are all annular, and the ring width of low coefficient of thermal conductivity material layer 9 is less than the ring width of heating element 4, and low coefficient of thermal conductivity material layer 9 and heating element 4 concentric arrangement. Specifically, the closer the ratio of the low-thermal-conductivity material layer 9 to the loop width value of the heating element 4 is to 1, the more beneficial the reduction of the wall surface superheat degree of the kettle bottom wall 1 is, i.e. the more obvious the noise reduction effect is; conversely, the smaller the ratio of the width of the low thermal conductivity material layer 9 to the width of the heating element 4, the less the noise reduction effect, and therefore, the ratio of the width of the low thermal conductivity material layer 9 to the width of the heating element 4 is preferably not less than 0.5 and less than 1.
In addition, when the heating element (e.g. an electrical heating tube) is installed in a fan-shaped ring shape right below the low thermal conductivity material layer 9, the protrusion 11 formed on the top surface of the kettle bottom wall 1 may be an annular protrusion (i.e. the protrusion 11 may be a circular ring shape or a fan-shaped ring shape with a circular arc cut), see fig. 6 and 7.
Preferably, referring to fig. 7 and 11, the protrusion 11 formed on the top surface of the kettle bottom wall 1 is an annular protrusion, the protrusion 11 is formed in a first fan-shaped ring shape having a first circular arc cut, and the contact heating area of the heating element 4 on the bottom surface of the kettle bottom wall 1 is formed in a second fan-shaped ring shape having a second circular arc cut, wherein the circular arc angle of the first circular arc cut is smaller than that of the second circular arc cut. Specifically, the heating element 4 (such as an electric heating tube) of the electric kettle is in a fan-ring shape, and the concentrated heating area on the kettle bottom wall 1 is correspondingly formed with the protrusion 11 in the fan-ring shape, which is beneficial to reducing the wall surface superheat degree of the kettle bottom wall 1, but if the protrusion 11 which can be filled with a material with a low thermal conductivity coefficient is formed at the position, far away from the concentrated heating area, on the kettle bottom wall 1, the heat conduction of the areas along the transverse direction of the kettle bottom wall 1 can be slowed down, that is, the temperature of the areas on the kettle bottom wall 1 rises slowly, which is not beneficial to the transverse heating balance. Of course, the protrusion 11 has a first arc notch, and the annular groove formed on the bottom surface of the kettle bottom wall 1 also has a corresponding arc notch, i.e. there is no need to fill the arc notch of the annular groove with a low thermal conductivity material, so that the material for producing the low thermal conductivity material can be reduced, and the production cost of the electric kettle can be reduced.
The invention is specifically illustrated below in several preferred embodiments.
In a first preferred embodiment, referring to fig. 2, 3 and 7, the top surface of the kettle bottom wall 1 is formed with a convex part 11 protruding upwards, the convex part 11 is formed into a first fan-shaped ring with a first circular arc cut, the bottom surface of the kettle bottom wall 1 is correspondingly formed with an annular groove recessed from the bottom surface into the convex part 11, the annular groove is filled with a fan-shaped ring-shaped mica layer, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the mica layer, and the thickness of the mica layer is 0.5 mm; the electrothermal tube is formed into a second fan-shaped ring with a second arc notch and is wound and arranged right below the mica layer; the mica layer and the electrothermal tube are concentrically arranged, the ring width of the mica layer is the same as that of the electrothermal tube (namely the ratio of the ring width of the mica layer to that of the electrothermal tube is 1), and the arc angle of the first arc notch is smaller than that of the second arc notch. Certainly, a base plate 8 can be additionally arranged between the kettle bottom wall 1 and the electrothermal tube, and the base plate 8 is an aluminum plate with the thermal conductivity coefficient not less than 100W/m.k.
In a second preferred embodiment, referring to fig. 4, 5 and 6, a convex part 11 which is convex upwards and is in a circular ring shape is formed on the top surface of the kettle bottom wall 1, a circular groove which is concave into the convex part 11 from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a circular ceramic layer is filled in the circular groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the ceramic layer, and the thickness of the ceramic layer is 0.5 mm; the electrothermal tube is coiled and installed right below the ceramic layer, the ceramic layer and the electrothermal tube are concentrically arranged, the ring width of the ceramic layer is smaller than that of the electrothermal tube, and the ratio of the ring width values is 0.5. Of course, a base plate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the base plate 8 is an aluminum plate with the thermal conductivity not less than 100W/m.k.
In a third preferred embodiment, referring to fig. 2, 3 and 6, a convex part 11 which is convex upwards and is in a circular ring shape is formed on the top surface of the kettle bottom wall 1, a circular groove which is concave into the convex part 11 from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a circular ceramic layer is filled in the circular groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the ceramic layer, and the thickness of the ceramic layer is 2 mm; the electrothermal tube is coiled and installed right below the ceramic layer, the ceramic layer and the electrothermal tube are concentrically arranged, the ring width of the ceramic layer is not less than the ring width of the electrothermal tube, and the ratio of the ring width values is 2. Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
In a fourth preferred embodiment, referring to fig. 4, 5 and 7, the top surface of the kettle bottom wall 1 is formed with a convex part 11 protruding upwards, the convex part 11 is formed into a first fan-shaped ring with a first circular arc cut, the bottom surface of the kettle bottom wall 1 is correspondingly formed with an annular groove recessed from the bottom surface into the convex part 11, the annular groove is filled with a fan-shaped ring-shaped mica layer, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the mica layer, and the thickness of the mica layer is 2 mm; the electrothermal tube is formed into a second fan-shaped ring with a second arc notch and is wound and arranged right below the mica layer; the mica layer and the electrothermal tube are concentrically arranged, the ring width of the mica layer is smaller than that of the electrothermal tube, the ratio of the ring width values is 0.5, and in addition, the arc angle of the first arc notch is smaller than that of the second arc notch. Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
In a fifth preferred embodiment, referring to fig. 2, 3 and 8, the arrangement area of the protrusion 11 on the top surface of the kettle bottom wall 1 is a circular ring area, a plurality of protrusions 11 spaced from each other in the circumferential direction are arranged in the circular ring area, and the protrusions 11 are radial linear protrusions extending in the radial direction; a groove which is recessed into the radial linear convex part from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a mica layer is filled in the groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the mica layer, and the thickness of the mica layer is 1 mm; the electrothermal tube is coiled and installed under the mica layer, the mica layer and the electrothermal tube are concentrically arranged, the ring width of the mica layer is not less than that of the electrothermal tube, and the ratio of the ring width values is 1.5. Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
In a sixth preferred embodiment, referring to fig. 2, 3 and 9, the arrangement area of the protrusion 11 on the top surface of the kettle bottom wall 1 is a circular ring area, and a plurality of linear protrusions extending along the chord line direction and spaced in parallel are arranged in the circular ring area; the bottom surface of the kettle bottom wall 1 is correspondingly provided with a groove which is recessed into the linear convex part from the bottom surface, a ceramic layer is filled in the groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the ceramic layer, and the thickness of the ceramic layer is 1.5 mm; the electrothermal tube is coiled and installed right below the ceramic layer, the ceramic layer and the electrothermal tube are concentrically arranged, and the ring width of the ceramic layer is the same as that of the electrothermal tube (namely the ratio of the ring width of the ceramic layer to that of the electrothermal tube is 1). Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
In a seventh preferred embodiment, referring to fig. 4, 5 and 8, the arrangement area of the protrusion 11 on the top surface of the kettle bottom wall 1 is a circular ring area, a plurality of protrusions 11 spaced from each other in the circumferential direction are arranged in the circular ring area, and the protrusions 11 are radial linear protrusions extending in the radial direction; a groove which is recessed into the radial linear convex part from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a ceramic layer is filled in the groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the ceramic layer, and the thickness of the ceramic layer is 1 mm; the electrothermal tube is coiled and installed right below the ceramic layer, the ceramic layer and the electrothermal tube are concentrically arranged, the ring width of the ceramic layer is smaller than that of the electrothermal tube, and the ratio of the ring width values is 0.5. Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
In an eighth preferred embodiment, referring to fig. 4, 5 and 9, the arrangement area of the protrusion 11 on the top surface of the kettle bottom wall 1 is a circular ring area, and a plurality of linear protrusions extending along the chord line direction and spaced in parallel are arranged in the circular ring area; a groove which is recessed into the linear convex part from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a mica layer is filled in the groove, the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the mica layer, and the thickness of the mica layer is 1.5 mm; the electrothermal tube is coiled and installed under the mica layer, the mica layer and the electrothermal tube are concentrically arranged, the ring width of the mica layer is smaller than that of the electrothermal tube, and the ratio of the ring width values is 0.5. Of course, a substrate 8 can be arranged between the kettle bottom wall 1 and the electrothermal tube, and the substrate 8 is a copper plate with a thermal conductivity not less than 100W/m.k.
The electric kettle of above eight kinds of embodiments is at the in-process that heats liquid water in the kettle, fill the low coefficient of thermal conductivity material that coefficient of thermal conductivity is not more than 40W/m k through the recess in the bottom surface of kettle bottom wall 1, and this low coefficient of thermal conductivity material is located heating element 4 directly over, can slow down the heat conduction along 1 thickness direction of kettle bottom wall, be favorable to the horizontal thermal equilibrium of being heated of kettle diapire 1, reduce the wall superheat degree of kettle diapire 1, and then can effectively avoid the intensive phenomenon of local bubble on the kettle diapire 1, reach the effect of making an uproar of showing and falling.
Specific example 1: the electric kettle structure shown in fig. 2, 3 and 6 is adopted, namely, a circular convex part 11 is formed on the top surface of the kettle bottom wall 1, a circular groove which is concave into the convex part 11 from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall 1, a circular mica layer is filled in the circular groove, and the bottom surface of the kettle bottom wall 1 is flush with the bottom surface of the mica layer; the bottom surface of the kettle bottom wall 1 is connected with an aluminum plate, and the electric heating tube is arranged on the bottom surface of the aluminum plate and is positioned right below the mica layer.
Wherein, the heating power of electrothermal tube: 1800W, water amount in the kettle: 1.7L.
The testing steps are as follows:
1) the water quantity with the highest water level is put into the kettle;
2) the water temperature sensor is arranged in the middle of the water level height of the center of the kettle;
3) pressing a start key to start timing measurement;
4) stopping timing measurement when the temperature of water in the kettle rises to 80 ℃;
5) and eliminating the noise value with the sound power value less than or equal to 45dB, carrying out A weighting on the tested noise value, and taking the average sound power as a judgment value.
The noise data obtained when the electric kettle was in operation are given in table 1 below.
Table 1: noise data table
Wherein, the thickness is the thickness of the mica layer (as the low heat conductivity coefficient material layer 9), and the ratio of the ring width value is the ratio of the mica layer to the ring width value of the electrothermal tube (as the heating element 4). Specifically, the thicker the low thermal conductivity material layer 9 is, the more beneficial to slow down the heat conduction along the thickness direction of the kettle bottom wall 1, the lower the degree of superheat of the wall surface of the kettle bottom wall 1 is, and the more beneficial to reduce the noise. In addition, the larger the ratio of the low thermal conductivity material layer 9 to the width of the heating element 4, the more beneficial the reduction of the heat conduction along the lateral direction of the kettle bottom wall 1, the lower the noise level generated by the electric kettle in operation.
Comparative example 1: the electric kettle structure shown in fig. 10 is adopted, wherein the kettle bottom wall 1 of the electric kettle is a horizontal kettle bottom wall, i.e. no protrusion 11 is formed on the top surface of the kettle bottom wall 1, and correspondingly no groove is formed on the bottom surface of the kettle bottom wall 1, of course, the electric kettle does not contain the low thermal conductivity material layer 9, and other experimental parameters are consistent with those in embodiment 1.
And (3) testing results: the maximum sound power value of the electric kettle in working is 68.4dB, and the average sound power value is 65.2 dB.
Comparing example 1 and comparative example 1, it can be seen that, compared to the case that the bottom wall 1 of the electric kettle is the horizontal bottom wall 1, the protrusion 11 is formed on the top surface of the bottom wall 1, the groove is correspondingly formed on the bottom surface of the bottom wall 1, the groove is filled with the low thermal conductivity material, and the heating element 4 is disposed under the low thermal conductivity material, the maximum sound power value generated by the heating element is significantly less than 68.4dB, and the average sound power value is also significantly less than 65.2dB, therefore, the groove formed on the bottom wall 1 of the electric kettle is located right above the heating element 4, and the groove is filled with the low thermal conductivity material, so that the maximum sound power and the average sound power value generated by the electric kettle during operation can be both reduced, and the effect of optimizing and reducing noise can be finally achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (7)
1. An electric kettle, wherein the electric kettle comprises a kettle bottom wall (1) and a heating element (4), a convex part (11) which is convex upwards is formed on the top surface of the kettle bottom wall (1), a groove which is concave into the convex part (11) from the bottom surface is correspondingly formed on the bottom surface of the kettle bottom wall (1), the groove is filled with a low-thermal-conductivity material with a thermal conductivity not more than 40W/m.k so as to form a low-thermal-conductivity material layer (9), the heating element (4) is annularly and spirally installed right below the low-thermal-conductivity material layer (9), and the thickness of the low-thermal-conductivity material layer (9) is not less than 0.5mm and not more than 2 mm;
the top surface of the kettle bottom wall (1) is provided with a circular ring area for arranging the bulge part (11); wherein a plurality of the protrusions (11) are arranged in the circular ring area and are spaced from each other along the circumferential direction, the protrusions (11) are radial linear protrusions extending along the radial direction, and the annular heating element (4) is arranged concentrically with the circular ring area; or a plurality of linear bulges which extend along the chord line direction and are spaced in parallel are arranged in the circular ring region, and the annular heating element (4) is concentrically arranged with the circular ring region;
the inner periphery of the low thermal conductivity material layer (9) is not larger than the inner periphery of the heating element (4), and the outer periphery of the low thermal conductivity material layer (9) is not smaller than the outer periphery of the heating element (4).
2. An electric kettle according to claim 1, wherein the thermal conductivity of the low thermal conductivity material layer (9) is not more than 20W/m.k.
3. An electric kettle according to claim 1, wherein the low thermal conductivity material layer (9) is a mica layer or a ceramic layer.
4. An electric kettle according to claim 1, wherein the bottom surface of the kettle bottom wall (1) is flush with the bottom surface of the layer of low thermal conductivity material (9).
5. An electric kettle according to claim 1, wherein the protrusion (11) is stamped and formed, the bottom surface of the kettle bottom wall (1) being formed with a corresponding stamped groove.
6. An electric kettle according to claim 1, wherein the layer of low thermal conductivity material (9) is arranged concentrically to the heating element (4), the layer of low thermal conductivity material (9) having a ring width not smaller than the ring width of the heating element (4) and a ratio of ring width values not larger than 2.
7. An electric kettle according to claim 1, further comprising a base plate (8) between the kettle bottom wall (1) and the heating element (4), the base plate (8) being a high thermal conductivity metal plate having a thermal conductivity of not less than 100W/m.k.
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| CN1672619A (en) * | 2004-02-23 | 2005-09-28 | 施特里克斯有限公司 | Noise reduction in water heating vessels |
| EP1651009A2 (en) * | 2004-10-21 | 2006-04-26 | Strix Limited | Heaters for liquid heating vessels |
| CN101234001A (en) * | 2007-02-01 | 2008-08-06 | 胡金高 | Fume-less cooker |
| CN202154509U (en) * | 2008-10-09 | 2012-03-07 | 翱泰温控器(深圳)有限公司 | Electric device and component |
| CN202619377U (en) * | 2012-04-26 | 2012-12-26 | 扈罗全 | Electric kettle heating plate and electric kettle |
| CN203647087U (en) * | 2012-08-17 | 2014-06-18 | 贸易联盟有限责任公司 | Electric kettle provided with heating element covered with ceramic coating |
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2017
- 2017-04-28 CN CN201710294739.1A patent/CN108784336B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1672619A (en) * | 2004-02-23 | 2005-09-28 | 施特里克斯有限公司 | Noise reduction in water heating vessels |
| EP1651009A2 (en) * | 2004-10-21 | 2006-04-26 | Strix Limited | Heaters for liquid heating vessels |
| CN101234001A (en) * | 2007-02-01 | 2008-08-06 | 胡金高 | Fume-less cooker |
| CN202154509U (en) * | 2008-10-09 | 2012-03-07 | 翱泰温控器(深圳)有限公司 | Electric device and component |
| CN202619377U (en) * | 2012-04-26 | 2012-12-26 | 扈罗全 | Electric kettle heating plate and electric kettle |
| CN203647087U (en) * | 2012-08-17 | 2014-06-18 | 贸易联盟有限责任公司 | Electric kettle provided with heating element covered with ceramic coating |
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