CN218942868U - Liquid heater - Google Patents

Abstract

The utility model discloses a liquid heater, which belongs to the field of household appliances and solves the problem of noise generated by small bubble cracking, wherein the technical scheme for solving the problem mainly comprises a kettle body, the kettle body comprises an inner container, a heat-conducting plate and a heating pipe, the inner container comprises a container body and a bottom wall, the bottom wall is connected to the bottom end of the container body, the heat-conducting plate is fixed on the outer surface of the bottom wall, the heating pipe is fixed on the outer surface of the heat-conducting plate, the inner surface of the bottom wall comprises a spherical surface extending outwards from the center, the spherical surface comprises a first area spherical surface, a second area spherical surface and a third area spherical surface which are distributed from inside to outside and are sequentially connected, the heating pipe is positioned on the outer surface of the heat-conducting plate corresponding to the second area spherical surface, the curvature of the first area spherical surface is K1, the curvature of the second area spherical surface is K2, the curvature of the third area spherical surface is K3, and K1 is more than or equal to K2. The utility model is mainly used for heating liquid, further relieves the problem of noise generated by dense breakage of small bubbles, and achieves better noise reduction effect.

Description

Liquid heater

Technical Field

The utility model relates to a household appliance, in particular to a liquid heater.

Background

The kettle bottom wall of the conventional liquid heater is a horizontal kettle bottom wall, and the electric heating disc is arranged on the bottom surface of the horizontal kettle bottom wall and directly heats the horizontal kettle bottom wall so as to heat liquid water in the liquid heater. The heat source of the electric heating disc comes from the electric heating tube, and the electric heating tube is in a surrounding shape, so that only the annular electric heating tube contact area in the bottom wall of the horizontal kettle is intensively heated, generated bubbles are small and dense, and the small bubbles are easier to separate from the bottom wall of the horizontal kettle. Like this, when the liquid heater during operation, the horizontal kettle diapire is concentrated and is heated, causes local bubble little and intensive, and is more easy to break away from horizontal kettle diapire, and then breaks the bubble in water, produces great noise.

To solve or alleviate this problem, prior art CN108324099a discloses an electric kettle comprising a hot plate assembly and a kettle bottom wall, the kettle bottom wall comprises a central disc portion and an outer ring portion, the top surface of the outer ring portion is formed into a slope surface, and an electric heating tube of the hot plate assembly is annularly coiled and mounted on the bottom surface of the outer ring portion. The inclined surface can be an inclined plane, an arc inclined plane or an irregular curved surface, and the like, and the electric heating tube in the hot plate assembly is correspondingly annularly coiled and installed on the bottom surface of the outer ring part. In the process that the electric kettle heats water in the electric kettle through the electric heating tube, dense small bubbles are generated on the top surface of the outer ring part of the slope surface, the small bubbles slide from bottom to top along the slope surface by utilizing the buoyancy of the bubbles and the adhesive force of the slope surface to the bubbles, so that the small bubbles on the slope surface are converged into large bubbles, when the buoyancy of the large bubbles is larger than the adhesive force of the bubbles given by the slope surface, the large bubbles are separated from the bottom wall of the kettle to enter the water, the large bubbles are not easy to break in the water, the phenomenon that local bubbles are small and dense can be effectively avoided, and the noise reduction effect is achieved.

In the prior art, since the electric heating tube needs to be installed on the bottom surface of the outer ring portion, the central disc portion of the bottom wall of the kettle still adopts a planar structure, and the periphery of the slope surface is connected with the kettle body, in the actual use process, instead of only the slope surface, bubbles are generated, small bubbles are slowly generated in the area, close to the electric heating tube, of the central disc portion, and when bubbles are generated in the area, close to the electric heating tube, of the central disc portion, the bubbles cannot be well guided to be large bubbles through the slope surface, and therefore, the situation that the small bubbles are broken to generate noise still exists in the area, close to the electric heating tube, of the central disc portion.

Disclosure of Invention

The utility model aims to provide a liquid heater, which further relieves the problem of noise generated by dense breakage of small bubbles and achieves better noise reduction effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a liquid heater, including the kettle body, the kettle body includes the inner bag, heat-conducting plate and heating pipe, the inner bag includes courage body and diapire, the diapire is connected in the bottom of courage body, the heat-conducting plate is fixed in the surface of diapire, the heating pipe is fixed in the surface of heat-conducting plate, the internal surface of diapire includes the sphere that outwards extends from the center, the sphere includes from inside to outside distribution and the first regional sphere that connects gradually, second regional sphere and third regional sphere, the heating pipe is located the surface that corresponds the second regional sphere on the heat-conducting plate, the camber of first regional sphere is K1, the camber of second regional sphere is K2, the camber of third regional sphere is K3, K1 is greater than or equal to K2, K3 is greater than or equal to K2.

After the technical scheme is adopted, the utility model has the following advantages: firstly, the inner surface of the bottom wall comprises a spherical surface extending outwards from the center, the structure of the spherical surface is smooth and dead angle-free, scale is not easy to generate, moreover, the cleaning is more time-saving and labor-saving for a user, secondly, the spherical surface comprises a first area spherical surface, a second area spherical surface and a third area spherical surface which are distributed from inside to outside and are sequentially connected, the inner surface of the bottom wall extends from the first area spherical surface to the third area spherical surface, the inner surface of the bottom wall extends outwards and upwards, small bubbles can be generated on the first area spherical surface, then the small bubbles can move onto the second area spherical surface more easily under the combined action of buoyancy of the gas and the adhesion force of water, so that the small bubbles are converged with the small bubbles generated on the second area spherical surface to form slightly larger bubbles, and then move to the third area spherical surface along the second area spherical surface, finally the slightly larger bubbles are separated from the third area spherical surface, and can be broken until the small bubbles rise to the water surface, so that the small bubbles can be effectively prevented from being broken after being generated on the first area spherical surface, and noise can be further reduced. According to the utility model, K1 is more than or equal to K2, namely, when the first region sphere extends towards the second region sphere, the change rate of the outward extension is not smaller than the change rate of the upward extension, so that the water in the liner can form circulation convection after being heated, the uniformity of heating is improved, the heating efficiency is improved, the circulation convection formed by heating can be utilized, the buoyancy of gas and the viscosity of water are matched to act together, and small bubbles generated on the first region sphere can stably move onto the second region sphere instead of being directly separated from the first region sphere to be converged, so that further noise reduction is facilitated. Meanwhile, K3 is more than or equal to K2, which means that when the spherical surface of the third area extends from inside to outside, the change rate of upward extension is not smaller than that of outward extension, so that bubbles can be guided to move upwards faster and reach the water surface faster, and the bubbles are not broken in the water, and further noise reduction is facilitated.

Further, the second area spherical surface is a spherical surface. By adopting the technical scheme, the small bubbles can uniformly and stably move on the spherical surface of the second area, so that the stable merging of the small bubbles is facilitated, the possibility that the small bubbles are directly separated from and cracked by the spherical surface of the second area is reduced, and the small bubbles from the spherical surface of the first area and the small bubbles from the spherical surface of the second area can be uniformly driven to merge.

Further, K1 gradually becomes smaller from the center of the inner surface of the bottom wall to the outer edge of the spherical surface of the first region, and K3 gradually becomes larger from the inner edge of the spherical surface of the third region to the outer edge. By adopting the technical scheme, the design K1 gradually becomes smaller from the center of the inner surface of the bottom wall to the outer edge of the spherical surface of the first area, namely the bending amplitude of the spherical surface of the first area from inside to outside gradually decreases, so that the moving speed of the small bubbles on the first area to the spherical surface of the second area is slowly reduced, the impact between the small bubbles and the small bubbles generated on the spherical surface of the second area is effectively reduced, the small bubbles generated on the spherical surface of the first area and the small bubbles generated on the spherical surface of the second area can be converged to form slightly larger bubbles, and meanwhile, the design K3 gradually becomes larger from the inner edge of the spherical surface of the third area to the outer edge, so that the upward extending change rate is larger than the outward extending change rate when the spherical surface of the third area extends from inside to outside, and the upward moving speed of the large bubbles formed by converging the spherical surface of the second area can be fast when the spherical surface of the third area moves, so that the large bubbles can be guided to move upwards more quickly and reach the water surface more quickly after the small bubbles are separated from the spherical surface of the third area, and the water is not broken, and the noise reduction is further facilitated.

Further, the K1 is changed from 0.02 to 0.015; and/or, the K3 varies from 0.015 to 0.03. Small bubbles generated on the spherical surface of the first area can stably reach the spherical surface of the second area, and can be better combined with the small bubbles of the spherical surface of the second area to form large bubbles; the large bubbles formed by the confluence can be quickly separated from the spherical surface of the third area and lifted to the water surface.

Further, k1=k2=k3. By adopting the technical scheme, the first area spherical surface, the second area spherical surface and the third area spherical surface are all spherical surfaces and are connected to form a larger spherical surface structure, and small bubbles positioned on the first area spherical surface can easily move to the second area spherical surface to be converged to form slightly larger bubbles.

Further, the outer edge of the spherical surface of the third area is tangentially connected with the bottom end of the inner side surface of the liner body; or, the inner surface of the bottom wall also comprises a cylindrical surface which is tangentially connected with the outer edge of the spherical surface, and the top end of the cylindrical surface is connected with the inner side surface of the liner body. By adopting the technical scheme, the large bubbles moving to the spherical surface of the third area are more easily separated from the spherical surface of the third area.

Further, the heating pipes are wound on the outer surface of the heat conducting plate for more than one circle, and the distance between two adjacent sections of heating pipes in the direction from the center to the periphery of the heat conducting plate is S, wherein S is less than or equal to 22mm. By adopting the technical scheme, a closed annular heating effect is formed, the heating uniformity is improved, the power of the heating pipe is ensured to be matched with the volume of the liner, and good heating efficiency is obtained.

Further, the heating pipe is provided with one and more than one circle of heating pipes; or, at least two heating pipes are arranged, and each heating pipe is wound for more than half a circle. By adopting the technical scheme, one heating pipe is arranged, the processing technology is relatively simple, and the processing cost is low; and a plurality of heating pipes are arranged, so that each heating pipe can independently control work, and multi-gear power output is realized.

Further, the outer bottom surface of the heat-conducting plate is provided with a temperature-sensing contact surface, the temperature-sensing contact surface is positioned under the spherical surface of the first area, the heating pipe is positioned at the outer periphery side of the temperature-sensing contact surface, the temperature-sensing contact surface is positioned in a cold area with lower temperature, the outer bottom surface of the heat-conducting plate is fixedly provided with a temperature controller, and the kick metal sheet of the temperature controller is attached to the temperature-sensing contact surface. By adopting the technical scheme, the temperature of the liner can be detected more accurately, and dry burning is prevented.

Further, a fixing boss is formed on the outer bottom surface of the heat conducting plate, and the temperature sensing contact surface is positioned on the lower surface of the fixing boss; or, the outer bottom surface of the heat conducting plate is provided with a fixed plate, and the temperature sensing contact surface is positioned on the lower surface of the fixed plate; or, the outer bottom surface of the heat conducting plate is a curved surface, the temperature sensing contact surface is a part of the curved surface forming the outer bottom surface of the heat conducting plate, and the kick metal sheet is provided with a curved surface attached to the temperature sensing contact surface. By adopting the technical scheme, the temperature controller is installed by forming a stable temperature-sensing contact surface, and the jump metal sheet can more accurately acquire the temperature change of the spherical surface of the first area, so that the quick action can be ensured when dry combustion occurs, and the power supply is cut off.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic diagram of an assembly structure of a liquid heater liner, a heat-conducting plate, a heating pipe and a temperature controller according to the present utility model;

FIG. 2 is a cross-sectional view of a liquid heater of the present utility model;

FIG. 3 is an enlarged view of the portion I of FIG. 2;

FIG. 4 is a top view of the thermostat of the present utility model;

FIG. 5 is a schematic view of the inner bladder, heat conductive plate and heating tube of the present utility model;

FIG. 6 is a bottom view of the structure shown in FIG. 5;

fig. 7 is a cross-sectional view of the bottom of the liner of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

It should be understood that in the present utility model, "comprising" and "having" and any variations thereof are intended to cover 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 that are expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present utility model, "plurality" means two or more. "and/or" is merely an association relationship describing an association object, meaning that three relationships may exist, for example, X and/or Y may represent: x alone, X and Y together, and Y alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "comprising X, Y and Z", "comprising X, Y, Z" means that all three of X, Y, Z comprise, "comprising X, Y or Z" means that one of the three comprises X, Y, Z, and "comprising X, Y and/or Z" means that any one or any two or three of the three comprise X, Y, Z.

The technical scheme of the utility model is described in detail below by specific examples. The following specific embodiments may be combined with or replaced with each other according to actual situations, and the same or similar concepts or processes may not be described in detail in some embodiments.

As shown in fig. 1 to 4, the present utility model provides a liquid heater, including a kettle body, the kettle body includes a liner 100, a heat-conducting plate 200 and a heating tube 300, the liner 100 includes a liner 101 and a bottom wall 102, the bottom wall 102 is connected to the bottom end of the liner 101, the heat-conducting plate 200 is fixed to the outer surface of the bottom wall 102, the heating tube 300 is fixed to the outer surface of the heat-conducting plate 200, the inner surface of the bottom wall 102 includes a sphere extending outwards from the center, the sphere includes a first area sphere 1021, a second area sphere 1022 and a third area sphere 1023 distributed from inside to outside and sequentially connected, the heating tube 300 is located on the outer surface of the heat-conducting plate 200 corresponding to the second area sphere 1022, the curvature of the first area sphere 1021 is K1, the curvature of the second area sphere 1022 is K2, the curvature of the third area sphere 1023 is K3, K1 is greater than or equal to K2, and K3 is greater than or equal to K2.

In the present utility model, firstly, the inner surface of the bottom wall 102 includes a spherical surface extending outwards from the center, with reference to the vertical center line of the inner container, and referring to the dotted line in fig. 1, the intersection point of the inner surface of the bottom wall 102 and the vertical center line of the inner container is the center of the inner surface of the bottom wall 102, the direction away from the center in the lateral direction is outwards, the spherical surface has a smooth structure without dead angle, which is not only difficult to generate scale, but also saves time and labor for cleaning by a user, secondly, the spherical surface includes a first region spherical surface 1021, a second region spherical surface 1022 and a third region spherical surface 1023 which are distributed from inside to outside and are sequentially connected, which means that the inner surface of the bottom wall 102 extends from the first region spherical surface 1021 to the third region spherical surface 1023, and extends upwards, so that after small bubbles are generated on the first region spherical surface 1021, the small bubbles are acted by the combined action of buoyancy of gas and the adhesion force of water, the small bubbles can move to the second region spherical surface 1022 more easily, so that the small bubbles 1022 form slightly larger bubbles which are converged with the second region spherical surface 1022, and then move to the third region 1023 along the second region spherical surface to the third region 1023, and the small bubbles can be further broken until the third region 1023 is further broken, and the small bubble can be prevented from being broken. According to the utility model, the design K1 is more than or equal to K2, namely, when the first region spherical surface 1021 extends to the second region spherical surface 1022, the change rate of the outward extension is not smaller than the change rate of the upward extension, so that the water in the liner 100 can form circulation convection after being heated, the heating uniformity is improved, the heating efficiency is improved, the circulation convection formed by heating can be utilized, the buoyancy of gas and the viscosity of water are matched, and small bubbles generated on the first region spherical surface 1021 can stably move to the second region spherical surface 1022 instead of being directly separated from the first region spherical surface 1021, so that the noise reduction is further facilitated. Meanwhile, K3 is larger than or equal to K2, which means that when the third region spherical surface 1023 extends from inside to outside, the change rate of upward extension is not smaller than that of outward extension, so that bubbles can be guided to move upwards faster and reach the water surface faster, and the bubbles are not broken in the water, and further noise reduction is facilitated. It will be appreciated that the higher the temperature and the lower the density of the water, if K1 < K2, the larger the difference in height between the second region spherical surface 1022 and the center of the inner surface of the bottom wall 102 will occur, and a portion of the water will be lower than the inner edge of the second region spherical surface 1022, which will be difficult to participate in the circulation convection formed by heating, so that not only will the heating be uneven, but also the heating efficiency be reduced, and the circulation convection will be difficult to make the small bubbles generated on the first region spherical surface 1021 move to the second region spherical surface 1022 more quickly, which may occur in the case of direct rupture on the first region spherical surface 1021, which is unfavorable for noise reduction. If K3 < K2, the third region spherical surface 1023 may extend from outside to inside, which not only results in the volume of the liner 100 being affected, but also prevents bubbles from rising to the water surface to rupture in the water, which is disadvantageous for noise reduction.

Since the liner 100 is basically a solid of revolution, the spherical surface on the inner surface of the bottom wall 102 may be formed by revolving an arc line around the vertical center line of the liner 100, where the curvatures K1, K2, K3 are determined according to different portions of the arc line. An arc refers to a smooth curve with centers of curvature on the same side, where the curve is conductive and continuous everywhere, such as an arc, elliptical arc, cycloid, involute, spiral, etc. In one embodiment, the liner 100 may be a unitary structure, i.e., the liner body 101 and the bottom wall 102 are integrally formed, typically made of metal, such as stainless steel. In another embodiment, the liner 100 may be a split structure, that is, the liner body 101 and the bottom wall 102 are respectively formed by machining and then are assembled and fixed into a whole, the liner body 101 may be made of a material resistant to high temperature, such as metal or glass, and the bottom wall 102 is generally made of metal.

In one embodiment, the second region spherical surface 1022 is a spherical surface, which can make the small bubbles move on the second region spherical surface uniformly and stably, is favorable for stably converging the small bubbles, reduces the possibility that the small bubbles are directly separated from the second region spherical surface 1022 and are broken, and can uniformly drive the small bubbles from the first region spherical surface 1021 to be converged with the small bubbles of the second region spherical surface 1022. On this basis, K1 may be selected to gradually decrease from the center of the inner surface of the bottom wall 102 to the outer edge of the first region spherical surface 1021, and K3 to gradually increase from the inner edge to the outer edge of the third region spherical surface 1023. Considering that the moving speed of the small bubbles generated on the spherical surface of the first area is too high, the small bubbles can mutually impact with the small bubbles generated on the spherical surface of the second area to cause the small bubbles to break, the design K1 gradually decreases from the center of the inner surface of the bottom wall to the outer edge of the spherical surface of the first area, namely the bending amplitude of the spherical surface of the first area, which extends from inside to outside, gradually decreases, the moving speed of the small bubbles on the spherical surface of the first area to the spherical surface of the second area is gradually decreased, the impact between the small bubbles generated on the spherical surface of the first area and the small bubbles generated on the spherical surface of the second area can be effectively reduced, the small bubbles generated on the spherical surface of the first area and the small bubbles generated on the spherical surface of the second area can be converged to form slightly larger bubbles, and meanwhile, the design K3 gradually increases from the inner edge to the outer edge of the spherical surface of the third area, so that when the spherical surface of the third area extends from inside to outside, the change rate of the upward extending is larger than the change rate of the large bubbles formed on the spherical surface of the second area, and the upward moving speed of the small bubbles can be gradually decreased along the spherical surface of the third area, and the small bubbles can not break up to the water surface of the third area. In the whole, from the first region spherical surface to the second region spherical surface and then to the third region spherical surface, small bubbles generated on the first region spherical surface start to move to obtain a certain initial speed, then slowly move to the second region spherical surface in a decelerating way, and after merging with the small bubbles of the second region spherical surface, the small bubbles enter the third region spherical surface to restart acceleration movement, so that stability of merging the small bubbles into large bubbles is guaranteed, possibility that the small bubbles are separated from the inner surface of the bottom wall is effectively reduced, the problem that the small bubbles are densely broken to generate noise is further solved, speed of the large bubbles rising to the water surface is improved, noise of the liquid heater during operation is reduced, and better noise reduction effect is achieved.

For example, K1 can be selected to be changed from 0.02 to 0.015, experiments prove that small bubbles generated on the spherical surface 1021 of the first area can stably reach the spherical surface 1022 of the second area, the small bubbles can be better converged with the small bubbles of the spherical surface 1022 of the second area to form large bubbles, K3 can be selected to be changed from 0.015 to 0.03, and experiments prove that the converged large bubbles can be quickly separated from the spherical surface 1023 of the third area and lifted to the water surface. The above selection is also equivalent to confirming k2=0.015. Of course, the specific values related to K1, K2 and K3 can be adjusted at the time of design and manufacture according to actual needs.

In another embodiment, k1=k2=k3, the first area spherical surface 1021, the second area spherical surface 1022 and the third area spherical surface 1023 are all spherical surfaces and are connected to form a larger spherical surface structure, and small bubbles located in the first area spherical surface 1021 can easily move to the second area spherical surface 1022 to be converged to form slightly larger bubbles.

In order to make it easier for large bubbles moving to third region sphere 1023 to rise to the water surface off third region sphere 1023, in one embodiment, the outer edge of third region sphere 1023 may be tangent to the bottom end of the inner side surface of bladder 101. In another embodiment, the inner surface of the bottom wall 102 further comprises a cylindrical surface tangentially connected to the outer edge of the spherical surface, and the top end of the cylindrical surface is connected to the inner side surface of the liner 101.

In the prior art, the heating tube is generally wound in a C-shaped opening ring shape, for example, as shown in fig. 5 of the prior art CN108324099a, a cold zone is formed at the opening when the heating tube works, and the heating uniformity is not good. In the present utility model, the inner surface of the bottom wall 102 of the liner 100 comprises a spherical surface, the heating pipe 300 is correspondingly located outside the spherical surface 1022 of the second area, in order to improve heating uniformity, it may be designed that the heating pipe 300 is wound on the outer surface of the heat conducting plate 200 for more than one circle, in the direction from the center to the periphery of the heat conducting plate 200, the distance between two adjacent sections of heating pipes 300 is S, S is less than or equal to 22mm, for example, the heating pipe 300 may be wound tightly, S is close to 0, s=2 mm, 5mm, 8mm, 10mm, 12mm, 15mm, 17mm, 20mm or 22mm may also be selected, so as to ensure that the power of the heating pipe 300 matches the volume of the liner 100. An excessively large S will result in a reduced length of the heating tube 300 that can be wound in the same area, and a reduced maximum power that can be achieved. In one embodiment, the heating tube 300 may be provided with only one and more than one turn; alternatively, in another embodiment, two heating pipes 300 are provided, each heating pipe 300 winds more than half a turn, and each heating pipe 300 can be independently controlled to work, so as to realize multi-gear power output. The number of heating pipes 300 may also be increased according to actual needs.

In order to more accurately detect the temperature of the liner 100 and prevent dry heating, a temperature sensing contact surface 201 may be provided on the outer side of the bottom of the heat conductive plate 200, the temperature sensing contact surface 201 may be located directly under the first region spherical surface 1021, the heating pipe 300 may be located on the outer circumferential side of the temperature sensing contact surface 201, the temperature sensing contact surface 201 may be located in a cold region having a low temperature, a thermostat 400 may be fixed to the outer bottom surface of the heat conductive plate 200, and a snap-through metal sheet 401 of the thermostat 400 may be bonded to the temperature sensing contact surface 201. The water level and the temperature of the first area 1021 are relatively low, and if the temperature of the temperature sensing contact surface 201 is too high to cause the jump metal plate 401 to act, the temperature of the first area 1021 rises to reach a certain temperature, which means that no water is dry-burned in the liner 100, thereby realizing the protection against dry-burning.

In order to form a stable temperature sensing contact surface 201 for installing the thermostat 400, in one embodiment, the outer bottom surface of the heat conducting plate 200 is provided with a fixed plate 203, the temperature sensing contact surface 201 is positioned on the lower surface of the fixed plate 203, and the fixed plate 203 is independently installed, so that the temperature sensing contact surface 201 can be prevented from being impacted or worn when the heat conducting plate 200 is installed, and the fit degree between the temperature sensing contact surface 201 and the jump metal piece 401 is influenced; alternatively, as shown in fig. 5 and fig. 6, in another embodiment, a fixing boss 202 may be formed on the outer bottom surface of the heat conducting plate 200, the temperature sensing contact surface 201 is located on the lower surface of the fixing boss 202, so that the structural strength of the fixing boss 202 and the heat conducting plate 200 is increased, and the fixing boss 202 may also play a role in assisting in positioning when installing the heat conducting plate 200, so as to facilitate the installation of the heat conducting plate 200; alternatively, as shown in fig. 7, in another embodiment, the outer bottom surface of the heat conducting plate 200 is a curved surface, the temperature sensing contact surface 201 is a part of the curved surface forming the outer bottom surface of the heat conducting plate 200, and the kick metal plate 401 has a curved surface that fits the temperature sensing contact surface 201, so that the fitting degree of the curved surface is higher, the heat conduction is more stable, and the sensing temperature of the temperature controller 400 is more accurate. In general, heat conduction silicone oil is also applied between the kick metal plate 401 and the temperature sensing contact surface 201 to improve heat conduction efficiency.

In the utility model, the temperature controller 400 can be provided with an electric coupling part 402 and a steam switch 403, the liquid heater can be generally provided with a power supply base, the power supply base is provided with a lower coupler, the electric coupling part 402 and the lower coupler are in plug-in electric coupling to supply power to the heating pipe 300, and after water in the liner 100 is boiled, steam flows into a temperature sensing chamber of the steam switch 403 to enable a temperature sensing metal sheet to act, so that the power supply is disconnected. In other models, the power base may not be configured, and the liquid heater is of an integral structure, for example, the liquid heater comprises a kettle body, the kettle body comprises a shell and a bottom plate, the bottom plate is fixed at the bottom of the shell, and the inner container is installed in the shell and provided with a containing cavity for containing the temperature controller with the bottom plate.

The liquid heater can be an electric kettle for boiling water, tea, hot milk and the like, and also can be a health-preserving kettle for cooking food materials. In addition to the preferred embodiments described above, other embodiments of the present utility model are also contemplated as falling within the scope of the claimed utility model, as well as all other embodiments that may be made by one of ordinary skill in the art without making any inventive effort based on the embodiments of the present utility model.

Claims (10)

1. The utility model provides a liquid heater, includes the kettle body, and the kettle body includes the inner bag, heat-conducting plate and heating pipe, and the inner bag includes courage body and diapire, and the diapire is connected in the bottom of courage body, and the heat-conducting plate is fixed in the surface of diapire, and the heating pipe is fixed in the surface of heat-conducting plate, a serial communication port, the internal surface of diapire includes the sphere that outwards extends from the center, and the sphere includes from inside to outside distribution and the first regional sphere that connects gradually, second regional sphere and third regional sphere, and the heating pipe is located the surface that corresponds the second regional sphere on the heat-conducting plate, and the camber of first regional sphere is K1, and the camber of second regional sphere is K2, and the camber of third regional sphere is K3, and K1 is greater than or equal to K2, K3 is greater than or equal to K2.

2. The liquid heater as claimed in claim 1, wherein the second region spherical surface is a spherical surface.

3. The liquid heater as claimed in claim 2, wherein K1 is gradually decreased from a center of the inner surface of the bottom wall to an outer edge of the spherical surface of the first region, and K3 is gradually increased from an inner edge to an outer edge of the spherical surface of the third region.

4. A liquid heater as claimed in claim 3, wherein K1 varies from 0.02 to 0.015; and/or, the K3 varies from 0.015 to 0.03.

5. The liquid heater of claim 2, wherein k1=k2=k3.

6. The liquid heater as claimed in claim 1, wherein the outer edge of the third region sphere is tangentially connected to the bottom end of the inner side surface of the liner body; or, the inner surface of the bottom wall also comprises a cylindrical surface which is tangentially connected with the outer edge of the spherical surface, and the top end of the cylindrical surface is connected with the inner side surface of the liner body.

7. The liquid heater as claimed in claim 1, wherein the heating pipes are wound on the outer surface of the heat conducting plate for more than one turn, and the distance between two adjacent sections of heating pipes in the direction from the center to the periphery of the heat conducting plate is S, wherein S is less than or equal to 22mm.

8. The liquid heater as claimed in claim 7, wherein the heating tube is provided with one and more than one turn; or, at least two heating pipes are arranged, and each heating pipe is wound for more than half a circle.

9. The liquid heater as claimed in claim 1, wherein a temperature sensing contact surface is provided at an outer side of a bottom of the heat conductive plate, the temperature sensing contact surface is located under a spherical surface of the first region, the heating pipe is located at an outer peripheral side of the temperature sensing contact surface, the temperature sensing contact surface is located in a cold region with a low temperature, a temperature controller is fixed at an outer bottom surface of the heat conductive plate, and a snap-through metal sheet of the temperature controller is attached to the temperature sensing contact surface.

10. The liquid heater as claimed in claim 9, wherein the heat conductive plate is mounted with a fixing plate at an outer bottom surface thereof, and the temperature sensing contact surface is positioned at a lower surface of the fixing plate; or, the outer bottom surface of the heat conducting plate is provided with a fixed boss, and the temperature sensing contact surface is positioned on the lower surface of the fixed boss; or, the outer bottom surface of the heat conducting plate is a curved surface, the temperature sensing contact surface is a part of the curved surface forming the outer bottom surface of the heat conducting plate, and the kick metal sheet is provided with a curved surface attached to the temperature sensing contact surface.

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