CN218164896U

CN218164896U - Water boiling pot

Info

Publication number: CN218164896U
Application number: CN202222330680.6U
Authority: CN
Inventors: 朱泽春; 白朋飞
Original assignee: Hangzhou Joyoung Household Electrical Appliances Co Ltd
Current assignee: Hangzhou Joyoung Household Electrical Appliances Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-12-30
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a boiling water a kind of deep pot, belong to the domestic appliance field, the problem of low heating efficiency is solved, the technical scheme who solves this problem is mainly including inner bag and heating pipe, the outer bottom surface of inner bag is including the heating region that is used for installing the heating pipe, the interior bottom surface of inner bag includes uncoated first region, by the second region that hydrophobic coating covered and uncoated third region, first region is located the regional periphery of second, the third region is located the regional inner circle side of second, the second region covers the vertical projection of heating region on the interior bottom surface of inner bag, first region and third region are through behind the hydrophobic coating of interior bottom surface spraying of inner bag, reuse laser forms behind the hydrophobic coating polishing, the radial width of first region is L1, the radial width of second region is L2, the radial width of third region is L3, L1: l2: l3=1:5:15. the utility model discloses mainly used effectively promotes the heating efficiency of boiling water a kind of deep pot to shorten the length when boiling water is required.

Description

Water boiling pot

Technical Field

The utility model relates to a domestic appliance, in particular to a water boiler.

Background

The existing boiling water pot generally comprises an inner container and a heating pipe, wherein a noise reduction layer is arranged on the inner bottom surface of the inner container in a whole spraying mode, noise is reduced to a certain degree, but the noise reduction layer can delay heat generated by the heating pipe to transfer water in the inner container to a certain degree, so that the water boiling time can be longer, the heating efficiency is lower, and good experience of a user is influenced. Of course, in the prior art, a boiled water pot with a locally sprayed noise reduction layer is also provided, after the noise reduction layer is sprayed on the whole inner bottom surface of the inner container, a part of the inner bottom surface of the inner container is polished in a mechanical polishing mode, and the heating efficiency can be improved to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to achieve provides a boiling water pot, overcomes the defects of the prior art, and effectively improves the heating efficiency of the boiling water pot, thereby shortening the time required for boiling water.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a boiling water a kind of deep pot, including inner bag and heating pipe, the outer bottom surface of inner bag is including the heating region that is used for installing the heating pipe, the interior bottom surface of inner bag is including the first region of no coating, by the second region and the third region of no coating that hydrophobic coating covered, the first region is located the regional periphery of second, the third region is located the regional inner circle side of second, the second region covers the vertical projection of heating region on the interior bottom surface of inner bag, first region and third region are through behind the hydrophobic coating of interior bottom surface spraying of inner bag, reuse laser forms behind the hydrophobic coating polishing, the radial width of first region is L1, the radial width of second region is L2, the radial width of third region is L3, L1: l2: l3=1:5:15.

after the technical scheme is adopted, the utility model has the advantages of as follows: firstly, only the second area of the inner bottom surface of the inner container is covered by the hydrophobic coating, compared with the scheme that the whole inner bottom surface of the inner container in the prior art is covered by the hydrophobic coating, the obstruction to heat transfer is effectively reduced, the heat of the heating pipe can be efficiently transferred to the water in the inner container, the heating efficiency is improved, secondly, the second area covers the vertical projection of the heating area on the inner bottom surface of the inner container, because the hydrophobic coating has hydrophobicity, small bubbles can swim away on the hydrophobic coating, in the wandering process, after the small bubbles continuously absorb heat and gather into large bubbles, the large bubbles can break after rising to the water surface, and the water at higher positions in the inner container and the water at the bottom in the inner container can also generate longitudinal convection, so that the heating efficiency is further improved, then, the first area and the third area without the coating are formed after polishing the coating by laser after being fully sprayed, and relative to mechanical polishing, the inner bottom surface of the inner container is not required to be specially treated, the processing is simple, the good flatness of the inner bottom surface of the inner container can be kept, the roughness is small, the mobility of bubbles can be greatly increased, the speed of gathering small bubbles into large bubbles is increased, the convection speed between water at a higher position in the inner container and water at the bottom in the inner container is further increased, the heating efficiency is further improved, the time required for boiling water is effectively shortened, in addition, the first area is positioned at the periphery of the second area, the third area is positioned at the inner ring side of the second area, the ratio of the radial width of the first area, the radial width of the second area and the radial width of the third area is reasonably set, compared with the second area, the small bubbles are easily separated from the inner bottom surface of the inner container on the first area and the third area, and the transverse convection can be formed between the first area and the second area and between the third area and the second area, the heating efficiency is improved, and the time required for boiling water is further shortened.

Furthermore, the inner bottom surface of the inner container comprises a first surface with a lower position and a second surface with a higher position, the second surface is located on the outer periphery side of the first surface, the first surface and the second surface are connected through a transition surface to form an annular inner step structure, the second area covers the inner step structure, the outer diameter D1 of the second area is larger than the inner diameter D1 of the first surface, and the inner diameter D2 of the second area is smaller than the outer diameter D2 of the second surface. After the technical scheme, firstly, the interior bottom surface of inner bag includes the lower first face in position and the higher second face in position, the second face is located the periphery side of first face, make the bubble that is located on the first face separate with the bubble on the second face, bubble and the bubble on the second face on the first face can not assemble, thereby it is too big to avoid the big bubble that the microbubble assembles the formation, effectively avoid the second region local dry combustion method to appear, make the hydrophobic coating in the second region be difficult for droing, be favorable to improving the life-span of hydrophobic coating, secondly, set up interior stair structure, and the position of stair structure in the principle, the big bubble breaks away from in the second region fast after contacting interior stair structure, be favorable to increasing the convection velocity of water in the inner bag, further promote heating efficiency, also can make the water horse cover the contact second region, let the temperature in second region descend, consequently, can effectively avoid appearing the condition of jumping because of dry combustion method.

Further, D1-D1 is more than or equal to 1.5mm, and d2-D2 is more than or equal to 1.5mm. After the technical scheme is adopted, the position relation of the first surface, the second surface and the second area is reasonably set so as to increase the range of the small bubbles moving in the second area, and the small bubbles in the second area can be converged into large bubbles to contact the inner step structure. If D1-D1 is less than 1.5mm and d2-D2 is less than 1.5mm, the moving range of the small bubbles is small, and the small bubbles do not gather to form large bubbles, and then the large bubbles contact the inner step structure and rise, so that the heating efficiency is influenced.

Further, the inner bottom surface and the inner side wall of the inner container are in transition through an arc surface, and D1 is not larger than the inner diameter of the arc surface. After through above-mentioned technical scheme, make the bubble contact the arc surface back along the arc surface rise for the convection velocity of water in the inner bag further promotes heating efficiency, also can simplify the structure, reduces the processing degree of difficulty, the production of being convenient for, if D1 is less than the internal diameter of arc surface, hydrophobic coating can cover on the arc surface, influences the aesthetic property.

Furthermore, the diameter of the inner bottom surface of the inner container is D, and D1 is smaller than D. After the technical scheme is adopted, the outermost periphery of the inner bottom surface of the inner container is not covered by the hydrophobic coating, so that heat transfer is accelerated, and heating efficiency is greatly improved. If D1 is not less than D, the inner bottom surface and the outer periphery of the inner container may be covered with the hydrophobic coating layer, and the water heating efficiency at the outer periphery of the inner bottom surface of the inner container may be low.

Further, the transition surface is a cylindrical surface or a conical surface. After the technical scheme, the cylindrical surface or the conical surface effectively reduce the resistance to the movement of water and bubbles, so that the water flows more smoothly, the cylindrical surface or the conical surface can also play a role in guiding the bubbles, the bubbles can ascend in different directions in the inner container after being guided by different tangential points of the cylindrical surface, so that the bubbles are more uniformly distributed in the water in the inner container, the water in each position in the inner container is uniformly heated, the heating efficiency is improved, the structure of the transition surface can be simplified, and the production is convenient.

Furthermore, the outer bottom surface of the inner container is provided with a heat conduction area, the heat conduction area is provided with a metal actuating sheet, and the heat conduction area avoids the second area. After the technical scheme is adopted, the metal actuating piece is heated to push the automatic power-off operation of water boiling, so that the use is safer, the dry burning is effectively avoided, and the heat conducting area is kept away from the second area, so that the temperature of the heat conducting area can be consistent with the water temperature in the inner container, the heat concentration of the heat conducting area where the metal actuating piece is located is prevented, and the early jump of the metal actuating piece is effectively avoided.

Furthermore, the horizontal distance between the vertical projections of the heat conduction area and the second area on the inner bottom surface of the inner container is S which is more than or equal to 2mm. After the technical scheme is adopted, the horizontal distance is reasonably set, so that heat can be uniformly distributed, and the metal actuating sheet can normally run. If S is less than 2mm, the heat in the heat conducting area is concentrated, the temperature of the metal actuating sheet is too high, early jump occurs, and the experience of a user is influenced.

Further, L1=4 to 5mm; or, L2=20 to 30mm; or, L3=65 to 75mm. After the technical scheme is adopted, the sizes of the L1, the L2 and the L3 are reasonably set, the area of the second area can be increased as much as possible, so that the number of small bubbles is reduced, the small bubbles can be gathered into large bubbles, the convection speed of water in the inner container is accelerated, and the time required for boiling water is further shortened.

Further, the outer bottom surface of the inner container is a plane; or the outer bottom surface of the inner container is provided with an outer step structure on the back surface of the transition surface. By adopting the technical scheme, the outer bottom surface of the inner container is a plane, so that the outer bottom surface of the inner container is heated more uniformly, and water in the inner container is heated more uniformly; or, the outer step structure is arranged, so that the structural strength of the inner container is improved, and the outer step structure can be correspondingly formed due to the fact that the transition surface is formed through stamping, so that the processing is simple.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

FIG. 1 is a schematic view of a water boiler of the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is a top view of a water boiling pot according to an embodiment;

FIG. 4 is a schematic view showing a polishing apparatus for polishing a first region according to one embodiment;

FIG. 5 is a schematic view showing a polishing apparatus for polishing a third region according to one embodiment;

FIG. 6 is a schematic view of a water boiling vessel according to the second embodiment;

FIG. 7 is an enlarged view of the structure at B in FIG. 6;

in the figure, 1, an inner container; 11. an outer bottom surface; 111. a heat conducting region; 12. an inner bottom surface; 121. a first region; 122. a second region; 123. a third region; 124. a first side; 125. a second face; 126. a transition surface; 127. an inner step structure; 13. a heating zone; 14. a circular arc surface; 2. heating a tube; 3. a laser device; 5. an air gun.

Detailed Description

To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

It should be understood that, in various embodiments of the present invention, the sequence numbers related to the processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

It should be understood that in the present application, "comprising" and "having" and any variations thereof, is intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present invention, "a plurality" means two or more. "and/or" is merely an association relationship describing an associated object, and means that there may be three relationships, for example, X and/or Y, and may mean: x alone, X and Y simultaneously, and Y alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "comprising X, Y and Z" and "comprising X, Y, Z" means that all three of X, Y and Z are comprised, "comprising X, Y or Z" means that one of the three of X, Y and Z is comprised, "comprising X, Y and/or Z" means that any one or any two or three of X, Y and Z are comprised.

The technical solution of the present invention will be described in detail with specific examples. The following specific embodiments may be optionally combined with or replaced by each other according to practical situations, and the same or similar concepts or processes may not be described in detail in some embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 3, the utility model provides a water boiler, including inner bag 1 and heating pipe 2, outer bottom surface 11 of inner bag 1 is including the heating zone 13 that is used for installing heating pipe 2, inner bottom surface 12 of inner bag 1 includes uncoated first region 121, by the second region 122 and the uncoated third region 123 of hydrophobic coating cover, first region 121 is located the periphery of second region 122, third region 123 is located the inner circle side of second region 122, second region 122 covers the perpendicular projection of heating zone 13 on inner bottom surface 12 of inner bag 1 (the dashed line ring that second region 122 covers is heating zone 13 in fig. 3), first region 121 and third region 123 form after hydrophobic coating polishing through the hydrophobic coating of inner bottom surface 12 spraying of inner bag 1, reuse laser, the radial width of first region 121 is L1, the radial width of second region 122 is L2, the radial width of third region 123 is L3, L1: l2: l3=1:5:15.

firstly, the inner bottom surface 12 of the inner container 1 is only covered by the second area 122, compared with the scheme that the whole inner bottom surface 12 of the inner container 1 in the prior art is covered by the hydrophobic coating, the obstruction to heat transfer is effectively reduced, so that the heat of the heating pipe 2 can be efficiently transferred to the water in the inner container 1, the heating efficiency is improved, secondly, the second area 122 covers the vertical projection of the heating area 13 on the inner bottom surface 12 of the inner container 1, because the hydrophobic coating has hydrophobicity, small bubbles can swim away on the hydrophobic coating, in the process of the wandering, after the small bubbles absorb heat and gather into large bubbles, the large bubbles can rise to the water surface and then break, and also water at a higher position in the inner container 1 and water at the bottom in the inner container 1 can generate longitudinal convection, so as to further improve the heating efficiency, then, the first area 121 and the third area 123 without the coating are formed after polishing the coating by using laser after full spray, relative to mechanical polishing, special treatment on the inner bottom surface 12 of the inner container 1 is not needed, the processing is simple, the first area 121 and the second area 122 and the third area 121 can be easily formed after the coating is polished, the effective area 121, the third area 122, the effective area 122 is formed, the area, the effective area 121, the effective area can be easily increased, the effective area of the second area, the third area 121 and the area 121, the area can be increased, the area 121, the area can be easily, the area, the effective area 121, the effective area can be increased in the effective area, the effective area 121, so that the water in the inner container 1 can form lateral convection between the first area 121 and the second area 122 and between the third area 123 and the second area 122, thereby improving the heating efficiency and further shortening the time required for boiling water.

In this embodiment, after the inner bottom surface 12 of the inner container 1 is sprayed with the hydrophobic coating, as shown in fig. 4, the laser device 3 performs polishing operation in the third area 123 along the track from the outside to the inside in the arrow direction; as shown in fig. 5, the laser device 3 performs polishing work on the first area 121 along the track from inside to outside in the direction of the arrow, so as to effectively avoid the laser from damaging the hydrophobic coating of the second area 122.

Because in the polishing process, scrap iron is generated, the hot scrap iron falls on the hydrophobic coating, melts the hydrophobic coating and sinks into the hydrophobic coating, and the scrap iron is accumulated on the paint spraying surface to form black point-shaped and linear traces which are difficult to remove by cleaning and wiping. Therefore, in the embodiment, the laser device 3 is further provided with the air gun 5, and when polishing is carried out, the air gun 5 blows air to the inner bottom surface 12 of the inner container 1, so that the temperature of iron chips is greatly reduced, damage to a hydrophobic coating is reduced, and the iron chips can be effectively prevented from being accumulated.

In order to further increase the heating efficiency, L1= 4-5 mm can increase the area of the second region 122 as much as possible, thereby reducing the number of bubbles, enabling the small bubbles to be gathered into large bubbles, accelerating the convection velocity of the water in the inner container 1, and further shortening the time required for boiling the water.

It is understood that in other embodiments, L2= 20-30 mm, the area of the second region 122 is increased as much as possible, and the structural arrangement may also be more reasonable;

it will be appreciated that in other embodiments, L3= 65-75 mm, enables the heat of the heating tube 2 to be efficiently transferred to the water, reducing the delay of heat transfer by the hydrophobic coating.

In this embodiment, the outer bottom surface 11 of the inner container 1 is provided with the heat conduction area 111, the metal actuator sheet is installed in the heat conduction area 111, the metal actuator sheet senses the temperature change of water boiling and the temperature change of the electric heating tube, the metal actuator sheet is pushed by heat to automatically power off the water boiling, the use is safer, and the dry burning is effectively avoided.

Through practical verification, the hydrophobic coating has poor heat transfer and heat dissipation performance, and in order to prevent the problem that the metal actuating piece jumps early in the water boiling process, in this embodiment, the heat conduction area 111 avoids the second area 122, so that the heat in the heat conduction area 111 can be timely transferred to the water in the inner container 1, the heat in the heat conduction area 111 where the metal actuating piece is located is prevented from being concentrated, and the metal actuating piece is effectively prevented from jumping early.

In order to avoid the heat concentration of the heat conducting area 111, the horizontal distance between the vertical projection of the heat conducting area 111 and the second area 122 on the inner bottom surface 12 of the inner container 1 is S, and S is more than or equal to 2mm. The horizontal spacing is reasonably arranged, so that heat can be uniformly distributed, and the metal actuating sheet can normally run. If S is less than 2mm, heat in the heat conducting area 111 is concentrated, and the temperature of the metal actuating sheet is too high to cause early jump, which affects the experience of the user.

In order to heat more uniformly, the outer bottom surface 11 of the inner container 1 is a plane, so that the outer bottom surface 11 of the inner container 1 is heated more uniformly, and water in the inner container 1 is heated more uniformly.

It can be understood that the outer bottom surface 11 of the inner container 1 is provided with an outer step structure on the back of the transition surface 126, so that the structural strength of the inner container 1 is increased, and the transition surface 126 is formed by stamping, so that the outer step structure is correspondingly formed, and the processing is simple.

Example two:

as shown in fig. 6 and 7, in the present embodiment, the inner bottom surface 12 of the inner container 1 includes a first lower surface 124 and a second higher surface 125, the second surface 125 is located on an outer peripheral side of the first surface 124, the first surface 124 and the second surface 125 are connected by a transition surface 126 and form an annular inner step structure 127, the second region 122 covers the inner step structure 127, an outer diameter D1 of the second region 122 is greater than an inner diameter D1 of the first surface 124, and an inner diameter D2 of the second region 122 is smaller than an outer diameter D2 of the second surface 125.

Firstly, the inner bottom surface 12 of the inner container 1 includes a first surface 124 with a lower position and a second surface 125 with a higher position, the second surface 125 is located at the outer periphery side of the first surface 124, so that bubbles located on the first surface 124 and bubbles located on the second surface 125 are separated, the bubbles located on the first surface 124 and the bubbles located on the second surface 125 cannot converge, thereby avoiding overlarge volume of large bubbles formed by convergence of small bubbles, effectively avoiding local dry burning of the second region 122, making the hydrophobic coating of the second region 122 not easy to fall off, and being beneficial to improving the service life of the hydrophobic coating.

Specifically, D1-D1 is more than or equal to 1.5mm, and d2-D2 is more than or equal to 1.5mm. The position relationship between the first surface 124, the second surface 125 and the second region 122 is set reasonably to increase the range of the small bubbles moving in the second region 122, so that the small bubbles in the second region 122 can contact the inner step structure 127 after converging into large bubbles. If D1-D1 is less than 1.5mm and d2-D2 is less than 1.5mm, the range of the small bubbles is small, and before the small bubbles are not converged to form large bubbles, the small bubbles contact the inner step structure 127 and rise, so that not only can large noise be generated, but also the heating uniformity of water in the inner container 1 can be influenced, and the time required by heating is prolonged.

Transition face 126 is the face of cylinder, the face of cylinder effectively reduces the resistance to water and bubble, make water flow more smooth, the face of cylinder also can play the guide effect to the bubble, the bubble can rise to equidirectional in the inner bag 1 after the different tangential point direction on face of cylinder, the aquatic that makes the bubble in inner bag 1 distributes more evenly, it is single effectively to avoid the ascending direction of bubble, the water convection that makes the single position is too fast, and, also can simplify transition face 126's structure, and the production of being convenient for.

It will be appreciated that the transition surface 126 may also be a conical surface, which is less bulky.

Compare in prior art, the interior bottom surface 12 and the inside wall of inner bag 1 set up perpendicularly, in this embodiment, through arc surface 14 transition between the interior bottom surface 12 of inner bag 1 and the inside wall, make the bubble contact 14 back edges arc surface 14 rises for the convection velocity of water in the inner bag 1, further promote heating efficiency, also can simplify the structure, reduce the processing degree of difficulty, the production of being convenient for.

And in order to increase the aesthetic property, D1 is not larger than the inner diameter of the arc surface 14, so that the hydrophobic coating is effectively prevented from covering the arc surface 14. If D1 is smaller than the inner diameter of the arc surface 14, the hydrophobic coating may cover the arc surface 14, which may affect the aesthetic property.

In order to further increase the heating efficiency, the diameter of the inner bottom surface 12 of the inner container 1 is D, D1 is smaller than D, so that the outermost periphery of the inner bottom surface 12 of the inner container 1 is not covered by the hydrophobic coating, the heat transfer is accelerated, and the heating efficiency is greatly increased. If D1 is not less than D, the outer periphery of the inner bottom surface 12 of the inner container 1 is covered with the hydrophobic coating, and the water heating efficiency at the outer periphery of the inner bottom surface of the inner container 1 is lowered.

Other contents not described in this embodiment may refer to embodiment one.

In addition to the above preferred embodiments, the present invention has other embodiments, and all other embodiments obtained by those skilled in the art without any creative work belong to the scope of the claimed invention.

Claims

1. The utility model provides a boiling water a kind of deep pot, including inner bag and heating pipe, the outer bottom surface of inner bag is including the heating region that is used for installing the heating pipe, a serial communication port, the interior bottom surface of inner bag is including the first region of no coating, the second region that is covered by the hydrophobic coating and the third region of no coating, the first region is located the regional periphery of second, the third region is located the regional inner circle side of second, the second region covers the vertical projection of heating region on the interior bottom surface of inner bag, first region and third region are through behind the hydrophobic coating of interior bottom surface spraying of inner bag, reuse laser forms after polishing the hydrophobic coating, the radial width of first region is L1, the radial width of second region is L2, the radial width of third region is L3, L1: l2: l3=1:5:15.

2. the water boiler as claimed in claim 1, wherein the inner bottom surface of the inner container includes a first surface with a lower position and a second surface with a higher position, the second surface is located at an outer circumferential side of the first surface, the first surface and the second surface are connected through a transition surface to form an annular inner step structure, the second area covers the inner step structure, an outer diameter D1 of the second area is larger than an inner diameter D1 of the first surface, and an inner diameter D2 of the second area is smaller than an outer diameter D2 of the second surface.

3. The water boiler as claimed in claim 2, wherein D1-D1 is not less than 1.5mm, and d2-D2 is not less than 1.5mm.

4. The water boiler as claimed in claim 2, wherein the inner bottom surface and the inner side wall of the inner liner are in transition through a circular arc surface, and D1 is not larger than the inner diameter of the circular arc surface.

5. The water boiler as claimed in claim 2, wherein the inner bottom surface of the inner container has a diameter D, and D1 is smaller than D.

6. The water boiler as claimed in claim 2, wherein the transition surface is a cylindrical surface or a conical surface.

7. The water boiler as claimed in claim 1, wherein the outer bottom surface of the inner container is provided with a heat conducting area, the heat conducting area is provided with a metal actuating sheet, and the heat conducting area is kept away from the second area.

8. The water boiler as claimed in claim 7, wherein the horizontal distance between the heat conducting area and the vertical projection of the second area on the inner bottom surface of the inner container is S, S ≧ 2mm.

9. The water boiler as claimed in claim 1, wherein L1= 4-5 mm; or, L2= 20-30 mm; or, L3=65 to 75mm.

10. The water boiler as claimed in claim 1, wherein the outer bottom surface of the inner container is a plane; or the outer bottom surface of the inner container is provided with an outer step structure on the back surface of the transition surface.