Water heating device

Abstract

The invention discloses a water heating device. The water heating device comprises a container and a heating source. The container comprises a heating wall, and the heating source is used for heating the heating wall to heat water in the container. A scale layer is formed on the surface, in contact with water, of the heating wall, and the thermal expansion coefficient of the heating wall is smaller than that of the scale layer. According to the water heating device, the heating wall with the low thermal expansion coefficient is adopted, under the condition that the heating source heats the heating wall, the incrustation scale layer expands and cracks relative to the heating wall and falls off from the heating wall, and therefore the purpose of removing incrustation scale is achieved, safety is good, and reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of hot water supply, and in particular to a water heating device. Background Art

[0002] Scale will be generated after the water heating device is used. The accumulation of scale will affect the heating efficiency and may even cause abnormal temperature rise, loss of control, and damage to the water heating device.

[0003] In the related art, a water heating device includes a heating wall surface, and the purpose of descaling is achieved by coating the heating wall surface with a coating. However, there is a difference in the thermal expansion coefficient of the coating and the thermal expansion coefficient of the heating wall surface, and there is a risk that the coating and the scale will fall off together. In addition, the coating may have chemical residues and low reliability. Summary of the invention

[0004] An embodiment of the present invention provides a water heating device.

[0005] An embodiment of the present invention provides a water heating device. The water heating device comprises:

[0006] a container comprising a heated wall;

[0007] A heating source is used to heat the heating wall to heat the water in the container, a scale layer is formed on the surface of the heating wall in contact with the water, and the thermal expansion coefficient of the heating wall is smaller than the thermal expansion coefficient of the scale layer.

[0008] The water heating device adopts a heating wall with a low thermal expansion coefficient. When the heating source heats the heating wall, the scale layer expands and cracks relative to the heating wall and falls off the heating wall, thereby achieving the purpose of descaling with good safety and high reliability.

[0009] In certain embodiments, the heating wall is a flat surface or a curved surface.

[0010] In this way, different types of water heating devices can be matched, thereby ensuring the heating efficiency and descaling efficiency of the water heating device.

[0011] In some embodiments, the difference between the thermal expansion coefficient of the scale layer and the thermal expansion coefficient of the heating wall is greater than or equal to 5x10 -6 / ℃.

[0012] In this way, the expansion difference between the scale layer and the heating wall is large enough to ensure the descaling effect of the water heating device, which is simple and efficient.

[0013] In certain embodiments, the material of the heating wall includes at least one of glass, ceramic, stainless steel and carbon fiber.

[0014] In this way, the chemical stability of the heating wall is improved, thereby providing conditions for safe descaling of the water heating device and ensuring the safe operation of the water heating device.

[0015] In certain embodiments, the heating source is integrally formed with the heating wall.

[0016] In this way, the assembly efficiency of the water heating device is improved while ensuring the descaling effect.

[0017] In certain embodiments, the heating source includes a film layer at least partially covering the surface of the heating wall.

[0018] In this way, the contact area between the heating source and the heating wall is increased, thereby improving the heating efficiency of the water heating device.

[0019] In some embodiments, the water heating device further includes a controller, and the controller is used to control the water heating device to operate in a normal working mode. In the normal working mode, the controller controls the heating source to heat the water in the container.

[0020] In this way, the water heating device is guaranteed to supply hot water normally, thereby meeting the water needs of users.

[0021] In some embodiments, the water heating device further includes a controller, which is used to control the water heating device to operate in a descaling mode. In the descaling mode, the controller controls the container to drain water so that at least part of the scale layer is exposed outside the water, and controls the heating source to heat the heating wall for descaling.

[0022] In this way, the difference in expansion between the heating wall and the scale layer is increased, so that the scale layer expands and cracks rapidly and falls off from the surface of the heating wall, thereby achieving the purpose of descaling.

[0023] In some embodiments, the controller is used to control the water heating device to operate in a normal working mode, in which the controller controls the heating source to heat the water in the container; the controller is used to control the water heating device to operate alternately in the normal working mode and the descaling mode.

[0024] In this way, the scale resistance of the heating wall is improved, thereby increasing the service life of the water heating device.

[0025] In some embodiments, the water heating device further comprises a controller, wherein the controller is configured to control the water heating device to operate in a mixed mode, wherein the controller controls the heating source to heat the heating wall to heat the water in the container and perform descaling at the same time.

[0026] In this way, the working efficiency of the water heating device is improved and the safety is improved.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic plan view of a water heating device according to an embodiment of the present invention;

[0030] Figure 2 is another schematic plan view of a water heating device according to an embodiment of the present invention;

[0031] Figure 3 It is a three-dimensional schematic diagram of a water heating device according to another embodiment of the present invention.

[0032] Description of main component reference numerals:

[0033] Water heating device 10 , container 11 , heating source 12 , controller 13 , scale layer 20 , heating wall 111 . DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The disclosure herein provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described herein. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0039] See also Figures 1 to 3 The embodiment of the present invention provides a water heating device 10. The water heating device 10 includes a container 11 and a heating source 12. The container 11 includes a heating wall 111, and the heating source 12 is used to heat the heating wall 111 to heat the water in the container 11. A scale layer 20 is formed on the surface of the heating wall 111 in contact with water, and the thermal expansion coefficient of the heating wall 111 is smaller than the thermal expansion coefficient of the scale layer 20.

[0040] The water heating device 10 adopts a heating wall 111 with a low thermal expansion coefficient. When the heating source 12 heats the heating wall 111, the scale layer 20 expands and cracks relative to the heating wall 111 and falls off the heating wall 111, thereby achieving the purpose of descaling with good safety and high reliability.

[0041] Specifically, in one embodiment, the water heating device 10 includes but is not limited to an instant hot water dispenser, and may also be other hot water supply devices, which are not specifically limited herein.

[0042] In one embodiment, if Figure 1 and Figure 2 As shown, the water heating device 10 can be a pool-type water heating device. Correspondingly, the container 11 can be square, for example, the container 11 can be a pool, and one of the surfaces can be selected as the heating wall 111, for example, the bottom surface or the side surface of the pool, so as to improve the heat transfer efficiency of the heating wall 111 while ensuring the uniformity of heating the water in the container 11.

[0043] In another embodiment, Figure 3 As shown, the water heating device 10 can be a pipe-type water heating device. Correspondingly, the container 11 can be cylindrical, for example, the container 11 can be a pipe, and the cylindrical surface of the pipe can be used as a heating wall 111 to improve the heat transfer efficiency of the heating wall 111 while ensuring the uniformity of heating the water in the container 11.

[0044] In other embodiments, the container 11 may also be a container of other shapes, which can be flexibly selected according to the heating requirements of the water heating device 10 and is not specifically limited here.

[0045] That is, the container 11 contains water inside the heating wall 111 , and a heating source 12 is provided outside the heating wall 111 , so that the heating source 12 can heat the water in the container 11 by heating the heating wall 111 .

[0046] In one embodiment, the heating wall 111 may be made of a material with good thermal conductivity, poor adhesion and good chemical stability to ensure heating efficiency while reducing the adhesion of the scale layer 20 to improve the descaling effect.

[0047] For example, in one example, the material of the heating wall 111 may be a graphite composite material, or other materials, which are not specifically limited herein.

[0048] In one embodiment, the heating source 12 may be a PTC heating wire or other heating elements, which is not specifically limited herein.

[0049] In one embodiment, the heating wall 111 is the heat conduction surface of the container 11 and is located between the heating source 12 and the scale layer 20. It can be used to transfer the heat generated by the heating source 12 to the scale layer 20, so that the heating wall 111 and the scale layer 20 with different thermal expansion coefficients respectively produce different degrees of expansion, so as to achieve physical descaling, which is safe and reliable.

[0050] It can be understood that the thermal expansion coefficient of the heating wall 111 is smaller than that of the scale layer 20, so that the thermal expansion rate of the scale layer 20 is larger than that of the heating wall 111, so that the scale layer 20 expands rapidly and cannot adhere to the heating wall 111 and falls off, thereby achieving the purpose of descaling.

[0051] In one embodiment, the heating wall 111 is arranged to surround the container 11 and the expansion degree of the heating wall 111 caused by heat is relatively small, so as to ensure the connection stability and safety of the container 11 .

[0052] In one embodiment, the scale layer 20 is formed in the container 11 and the scale layer 20 expands relatively greatly when heated, so that the scale layer 20 cannot fit tightly against the heating wall 111 and falls off from the container 11, with high reliability and no chemical hazards.

[0053] In some embodiments, the heating wall 111 is a flat surface or a curved surface.

[0054] In this way, different types of water heating devices 10 can be matched, thereby ensuring the heating efficiency and descaling efficiency of the water heating device 10 .

[0055] Specifically, in one embodiment, Figure 1 and Figure 2 As shown, the heating wall 111 may be a plane to form a square water heating device 10 to ensure uniform heating of the water heating device 10 , thereby improving the heating efficiency of the water heating device 10 .

[0056] For example, in one example, the water heating device 10 may be a pool-type water heating device, or may be a device of other shapes, which is not specifically limited herein.

[0057] In one embodiment, if Figure 3 As shown, the heating wall 111 can be a curved surface to form a cylindrical water heating device 10, or it can form a water heating device 10 of other curved shapes, without specific restrictions herein, to ensure the uniformity of heating of the water heating device 10, thereby improving the heating efficiency of the water heating device 10.

[0058] For example, in one example, the water heating device 10 may be a pipe-type water heating device, or a device of other shapes, which is not specifically limited herein.

[0059] In summary, the heating wall 111 is a flat surface or a curved surface to match different types of water heating devices 10 , thereby improving the connection stability of the container 11 , reducing safety hazards, and further ensuring the descaling efficiency of the water heating device 10 .

[0060] See also Figure 1In some embodiments, the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 is greater than or equal to 5x10 -6 / ℃.

[0061] In this way, the expansion difference between the scale layer 20 and the heating wall 111 is large enough to ensure the descaling effect of the water heating device 10, which is simple and efficient.

[0062] Specifically, in one embodiment, the heating wall 111 should select an appropriate thermal expansion coefficient to ensure that the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 is greater than a predetermined value, so that the expansion difference between the scale layer 20 and the heating wall 111 is large enough to ensure the descaling effect of the water heating device 10.

[0063] In one embodiment, the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 may be greater than or equal to 5×10 -6 / ℃, that is, for every 1 degree Celsius increase in temperature, the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 should be greater than or equal to 5x10 -6 , to ensure that the scale layer 20 expands and falls off from the heating wall 111 better, thereby improving the descaling efficiency of the water heating device 10.

[0064] The upper limit of the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 can be determined based on empirical values, and is not specifically limited here. The difference is greater than or equal to 5x10 -6 / ℃ is enough.

[0065] In some examples, the difference between the thermal expansion coefficient of the scale layer 20 and the thermal expansion coefficient of the heating wall 111 may be 5×10 -6 / ℃、5.2x10 -6 / ℃、5.3x10 -6 / ℃、5.7x10 -6 / ℃、5.9x10 -6 / ℃, etc.

[0066] In some embodiments, the material of the heating wall 111 includes at least one of glass, ceramic, stainless steel, and carbon fiber.

[0067] In this way, the chemical stability of the heating wall 111 is improved, thereby providing conditions for safe descaling of the water heating device 10 and ensuring safe operation of the water heating device 10 .

[0068] Specifically, in one embodiment, the heating wall 111 surrounds at least a portion of the surface of the container 11, and a suitable material with a low thermal expansion coefficient should be selected to ensure the heat transfer efficiency of the heating source 12 and reduce the adhesion of the heating wall 111, thereby facilitating physical descaling according to the difference in expansion rate.

[0069] In one embodiment, the melting point of the heating wall 111 is relatively high and much greater than the boiling point of water to ensure safe operation of the water heating device 10 .

[0070] In one embodiment, the material of the heating wall 111 includes at least one of glass, ceramic, stainless steel and carbon fiber, so that the heating wall 111 has good corrosion resistance, good thermal conductivity and low permeability, thereby improving the stability of the heating wall 111 and ensuring the safe operation of the water heating device 10.

[0071] In detail, the heating wall 111 may be made of glass material, which has the characteristics of good visibility, high smoothness and low thermal expansion coefficient, so as to improve the descaling efficiency of the water heating device 10 .

[0072] The heating wall 111 may be made of a ceramic material, which has the characteristics of high heat transfer efficiency, good thermal stability and low thermal expansion coefficient, so as to improve the descaling efficiency of the water heating device 10 .

[0073] The heating wall 111 can be made of invariable steel (iron-nickel alloy) material, which has the characteristics of a small thermal expansion coefficient or even close to zero. It can ensure no deformation within a wide temperature range, that is, it will not expand or contract with changes in temperature. It has high stability and can improve the descaling efficiency of the water heating device 10.

[0074] The heating wall 111 may be made of a carbon fiber material, which has the characteristics of high thermal efficiency, good thermal stability and low thermal expansion coefficient, so as to improve the descaling efficiency of the water heating device 10 .

[0075] In other embodiments, the heating wall 111 may also be made of other materials with low thermal expansion coefficients to meet the descaling requirements, which is not specifically limited herein.

[0076] In some embodiments, the heating source 12 is integrally formed with the heating wall 111 .

[0077] In this way, the assembly efficiency of the water heating device 10 is improved while ensuring the descaling effect.

[0078] Specifically, in one embodiment, the heating source 12 and the heating wall 111 can be formed into an integral device through an integrated molding process. It can be understood that the heating source 12 is equipped with the heating wall 111 to ensure that the heating wall 111 can evenly transfer heat and electrically insulate. At the same time, the heating wall 111 with a low thermal expansion coefficient can be used for expansion and descaling, which is convenient and efficient.

[0079] It can be understood that the heating source 12 and the heating wall 111 are integrally formed to reduce the steps of connecting the heating source 12 and the heating wall 111, thereby improving the assembly efficiency of the water heating device 10 and reducing the cost.

[0080] See also Figures 1 to 3 In some embodiments, the heating source 12 includes a film layer at least partially covering the surface of the heating wall 111 .

[0081] In this way, the contact area between the heating source 12 and the heating wall 111 can be increased, thereby improving the heating efficiency of the water heating device 10.

[0082] Specifically, in one embodiment, the heating source 12 includes a film layer at least partially covering the surface of the heating wall 111. It can be understood that the heating source 12 can be partially wrapped around the surface of the heating wall 111 to form a contact heat conduction path, thereby ensuring the normal operation of the water heating device 10.

[0083] For example, in one example, the area of ​​the heating wall 111 wrapped by the heating source 12 can be two-thirds, or other proportions, to ensure the minimum heating temperature of the water heating device 10, thereby ensuring the normal operation of the water heating device 10, without specific limitation herein.

[0084] In one embodiment, the heating source 12 includes a film layer that is at least partially covered on the surface of the heating wall 111. It can be understood that the heating source 12 basically covers the surface of the heating wall 111 to increase the contact area between the heating source 12 and the heating wall 111 and form a contact heat conduction path, thereby improving the heating efficiency of the water heating device 10.

[0085] In some embodiments, the water heating device 10 further includes a controller 13 , and the controller 13 is used to control the water heating device 10 to operate in a normal working mode. In the normal working mode, the controller 13 controls the heating source 12 to heat the water in the container 11 .

[0086] In this way, it is ensured that the water heating device 10 can supply hot water normally, thereby meeting the water demand of users.

[0087] Specifically, in one embodiment, the normal working mode may be that the water heating device 10 normally heats the water in the container 11 to ensure a normal water supply working state, and at this time, there is no need to perform descaling operations.

[0088] In one embodiment, the controller 13 is electrically connected to the water heating device 10 and can be used to control the heating source 12 to supply heat to the container 11 to ensure that the water heating device 10 operates in a normal working mode.

[0089] That is, the controller 13 can ensure the safe operation of the water heating device 10 to meet the user's water demand by instantly obtaining the user's normal water use instructions.

[0090] In some embodiments, the water heating device 10 also includes a controller 13, which is used to control the water heating device 10 to operate in a descaling mode. In the descaling mode, the controller 13 controls the container 11 to drain water so that at least part of the scale layer 20 is exposed outside the water, and controls the heating source 12 to heat the heating wall 111 for descaling.

[0091] In this way, the expansion difference between the heating wall 111 and the scale layer 20 is increased, so that the scale layer 20 expands and cracks quickly and falls off from the surface of the heating wall 111, thereby achieving the purpose of descaling.

[0092] Specifically, in one embodiment, the descaling mode may be a stage in which the water heating device 10 performs a descaling operation when at least a portion of the scale layer 20 is exposed to the water.

[0093] That is, the heating source 12 directly heats the heating wall 111 and the scale layer 20 in the dry-burning stage.

[0094] In one embodiment, the heating source 12 can heat the heating wall 111 and the scale layer 20 according to the original heating temperature, so that the water heating device 10 works in a descaling mode to improve the descaling effect.

[0095] In one embodiment, the controller 13 is electrically connected to the water heating device 10 and can be used to control the water discharge of the container 11 in the descaling mode to reduce resistance and energy consumption, thereby improving descaling efficiency.

[0096] That is, the controller 13 can control the water volume in the container 11 to be lower than a predetermined value by instantly obtaining the user's instruction to perform the descaling mode, for example, at least a portion of the scale layer 20 is exposed outside the water, so as to meet the user's descaling needs.

[0097] In one embodiment, at least part of the scale layer 20 is exposed to the water, which can be understood as a small amount of water droplets in the container 11, so that the heating wall 111 and the scale layer 20 heat up quickly and expand at different speeds, causing the scale layer 20 to expand and fall off, thereby ensuring the descaling effect while increasing the service life of the water heating device 10.

[0098] In another embodiment, at least part of the scale layer 20 is exposed to the water, which can be understood as the scale layer 20 being exposed to the water, that is, the container 11 is in a water-free state, and is heated by the heating source 12 to quickly heat the heating wall 111 and the scale layer 20, so that the scale layer 20 quickly expands and falls off, and the descaling effect is good.

[0099] For example, in one example, the heating wall 111 can be made of a non-stainless steel material, so that the scale layer 20 is generated on the non-stainless steel surface in the normal working mode, and the scale layer 20 is dry-heated in the descaling mode (for example, when the scale layer 20 is exposed to water) to expand and fall off from the non-stainless steel surface, thereby ensuring the descaling effect of the water heating device 10.

[0100] In some embodiments, the controller 13 is used to control the water heating device 10 to work in a normal working mode. In the normal working mode, the controller 13 controls the heating source 12 to heat the water in the container 11. The controller 13 is used to control the water heating device 10 to work alternately in the normal working mode and the descaling mode.

[0101] In this way, the anti-scaling performance of the heating wall 111 is improved, thereby increasing the service life of the water heating device 10.

[0102] Specifically, in one embodiment, the water heating device 10 operates alternately in a normal working mode and a descaling mode, so that the heating wall 111 can be separated from the scale layer 20 in time, reducing scale accumulation, and achieving descaling operation without increasing the heating temperature of the heating source 12, thereby reducing energy consumption and costs.

[0103] It can be understood that the water heating device 10 operates alternately between the normal working mode and the descaling mode, so that the hot water supply stage and the descaling stage are independent of each other, thereby ensuring that the heating source 12 can complete the hot water supply operation and the descaling operation at a lower temperature, thereby improving the service life of the water heating device 10.

[0104] In one embodiment, the scale layer 20 may undergo a “cleaning-generation-cleaning” cycle, so that the scale resistance of the heating wall 111 is improved, thereby increasing the service life of the water heating device 10 .

[0105] In some embodiments, the water heating device 10 further includes a controller 13, which is used to control the water heating device 10 to operate in a hybrid mode. In the hybrid mode, the controller 13 controls the heating source 12 to heat the heating wall 111 to heat the water in the container 30 while performing descaling.

[0106] In this way, the working efficiency of the water heating device 10 is improved and the safety is improved.

[0107] Specifically, in one embodiment, the mixed mode may be that the water heating device 10 performs the normal working mode and the descaling mode simultaneously, so as to improve the hot water supply efficiency and the descaling efficiency.

[0108] That is, in the mixed mode, the controller 13 controls the water heating device 10 to perform hot water supply operation and descaling operation at the same time, so that the scale layer 20 separates from the heating wall 111 at a faster expansion speed, which can not only ensure the user's water demand, but also realize descaling operation with good working efficiency.

[0109] It can be understood that the water heating device 10 performs the normal working mode and the descaling mode simultaneously, so that the hot water supply stage and the descaling stage cooperate with each other and work together to meet the actual needs of the user.

[0110] In one embodiment, in the hybrid mode, the water heating device 10 is descaled when there is water in the container 11 , thereby reducing the dry-boiling phenomenon and further improving the safety of the water heating device 10 .

[0111] It is worth noting that in the mixed mode, that is, when the water heating device 10 performs hot water supply operation and descaling operation at the same time, the heating temperature of the heating source 12 can be flexibly adjusted according to the amount of scale layer 20 generated and the thermal expansion coefficient of the heating wall 111, and no specific limitation is made here.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A water heating device, characterized in that: The water heating device comprises: a container, the container comprising a heated wall; A heating source is used to heat the heating wall to heat the water in the container, a scale layer is formed on the surface of the heating wall in contact with the water, and the thermal expansion coefficient of the heating wall is smaller than the thermal expansion coefficient of the scale layer.

2. The water heating device according to claim 1, characterized in that: The heating wall is a flat surface or a curved surface.

3. The water heating device according to claim 1, characterized in that: The difference between the thermal expansion coefficient of the scale layer and the thermal expansion coefficient of the heating wall is greater than or equal to 5x10 -6 / ℃.

4. The water heating device according to claim 1, characterized in that: The material of the heating wall includes at least one of glass, ceramic, stainless steel and carbon fiber.

5. The water heating device according to claim 1, characterized in that: The heating source and the heating wall are integrally formed.

6. The water heating device according to claim 5, characterized in that The heating source comprises a film layer at least partially covering the surface of the heating wall.

7. The water heating device according to claim 1, characterized in that The water heating device further comprises a controller, wherein the controller is used to control the water heating device to operate in a normal working mode. In the normal working mode, the controller controls the heating source to heat the water in the container.

8. The water heating device according to claim 1, characterized in that The water heating device also includes a controller, which is used to control the water heating device to operate in a descaling mode. In the descaling mode, the controller controls the container to drain water so that at least part of the scale layer is exposed outside the water, and controls the heating source to heat the heating wall for descaling.

9. The water heating device according to claim 8, characterized in that The controller is used to control the water heating device to operate in a normal working mode. In the normal working mode, the controller controls the heating source to heat the water in the container; The controller is used to control the water heating device to operate alternately in the normal working mode and the descaling mode.

10. The water heating device according to claim 1, characterized in that The water heating device further comprises a controller, wherein the controller is used to control the water heating device to operate in a mixed mode. In the mixed mode, the controller controls the heating source to heat the heating wall to heat the water in the container and perform descaling at the same time.

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