Household appliance

Abstract

The present invention provides a household appliance. The household appliance comprises: a housing, the housing comprising a bottom wall and side walls connected together, and configured to hold water; and a coating formed on at least a portion of the inner surface of the housing, the coating comprising a quasicrystal material. The household appliance is resistant to rust and scale formation and exhibits excellent corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of everyday consumer goods technology, specifically to household appliances. Background Technology

[0002] Currently, many household appliances that can hold water, including kettles, health pots, garment steamers, humidifiers, or water heaters, have the technical problem that scale easily forms on the inner wall when boiling water for a long time. At the same time, water rust is also very easy to form on the surface of these household appliances.

[0003] Therefore, the relevant technologies of existing household appliances still need to be improved. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one object of this invention is to provide a household appliance that is not prone to rust, does not easily produce scale, or has good corrosion resistance.

[0005] In one aspect of the invention, a household appliance is provided. According to an embodiment of the invention, the household appliance includes: a receiving cavity comprising a connected bottom wall and side walls, the receiving cavity being used to receive water; and a coating formed on at least a portion of the inner surface of the receiving cavity, the coating containing a quasicrystalline material. The inventors have discovered that the coating on the inner surface of the receiving cavity in this household appliance contains a quasicrystalline material. Because the quasicrystalline material has low surface energy and good corrosion resistance, the household appliance is less prone to rusting and scale buildup, and exhibits good corrosion resistance.

[0006] According to an embodiment of the present invention, the sidewall has a water level line, the coating is formed on the bottom wall and the sidewall, and the coating is formed at least on the lowest water level line.

[0007] According to an embodiment of the present invention, the coating surface is a silver reflective surface.

[0008] According to an embodiment of the present invention, the surface roughness of the coating is 0.08-1.25 μm.

[0009] According to an embodiment of the present invention, the porosity of the coating is 0.1%-20%.

[0010] According to an embodiment of the present invention, the coating is formed of a quasicrystalline material.

[0011] According to an embodiment of the present invention, the coating further includes: Teflon or ceramic non-stick material.

[0012] According to an embodiment of the present invention, the bottom wall and / or sidewall contains the quasicrystalline material at a position corresponding to the coating.

[0013] According to an embodiment of the present invention, the coating is formed on the inner surface at the location where the bottom wall and the side wall are connected.

[0014] According to an embodiment of the present invention, the coating is formed on the inner surface of the bottom wall.

[0015] According to an embodiment of the present invention, the household appliance further includes: a heating device disposed at the bottom of the receiving cavity; wherein the coating is formed on the inner surface of the bottom wall at a position corresponding to the heating device.

[0016] According to an embodiment of the invention, the coating is formed on the entire inner surface of the receiving cavity.

[0017] According to an embodiment of the present invention, the household appliance further includes a heating device disposed at the bottom of the receiving cavity, the connection between the bottom wall and the side wall is smoothly transitioned, and the coating is formed only on the inner surface of the bottom wall at the position corresponding to the heating device.

[0018] According to an embodiment of the present invention, the household appliance further includes: a water supply pipe connected to the receiving cavity, the coating being formed on at least a portion of the inner surface of the water supply pipe.

[0019] According to an embodiment of the present invention, the household appliance is a kettle, a health pot, a garment steamer, a humidifier, or a water heater.

[0020] According to an embodiment of the present invention, the coating comprises a plurality of sub-coatings stacked sequentially from bottom to top, wherein the particle size of the quasicrystalline material in at least one of the sub-coatings is larger than the particle size of the quasicrystalline material in at least one of the sub-coatings above it.

[0021] According to an embodiment of the present invention, the coating satisfies at least one of the following conditions: the content of quasicrystalline material in the coating is 20%-90%; the thermal conductivity of the coating is 0.1-3 W / m·K; and the thickness of the coating is 20-200 micrometers.

[0022] According to an embodiment of the present invention, the coating surface has an uneven structure. Attached Figure Description

[0023] Figure 1 A cross-sectional structural diagram of a household appliance according to an embodiment of the present invention is shown.

[0024] Figure 2 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0025] Figure 3A cross-sectional structural schematic diagram of a household appliance according to yet another embodiment of the present invention is shown.

[0026] Figure 4 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0027] Figure 5 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0028] Figure 6 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0029] Figure 7 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0030] Figure 8 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0031] Figure 9 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0032] Figure 10 A cross-sectional structural schematic diagram of a household appliance according to another embodiment of the present invention is shown.

[0033] Figure label:

[0034] 110: Bottom wall; 120: Side wall; 200: Coating; 201a, 201b: Sub-coating; 300: Heating device; 400: Water supply pipeline; L: Bottom water level line. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products.

[0036] In one aspect of the invention, a household appliance is provided. According to an embodiment of the invention, referring to... Figures 1 to 10The household appliance includes: a receiving cavity comprising a bottom wall 110 and a side wall 120 connected together, the receiving cavity being used to receive water; and a coating 200 formed on at least a portion of the inner surface of the receiving cavity, the coating 200 containing a quasicrystalline material. The inventors have discovered that the coating 200 on the inner surface of the receiving cavity in this household appliance contains a quasicrystalline material. Because the quasicrystalline material has low surface energy and good corrosion resistance, the household appliance is less prone to rust and scale buildup, and exhibits excellent corrosion resistance.

[0037] According to embodiments of the present invention, the specific location where the coating 200 is formed on the inner surface of the receiving cavity is not particularly limited. In some embodiments of the present invention, the coating 200 may be formed on the inner surface at the junction of the bottom wall 110 and the side wall 120 (see schematic diagram). Figure 1 The coating 200 may also be formed only on the inner surface of the bottom wall 110 (see structural schematic diagram). Figure 2 The coating 200 can also be formed both on the inner surface of the junction of the bottom wall 110 and the side wall 120, and on the inner surface of the bottom wall 110 (see structural schematic diagram). Figure 3 The housing of this household appliance is used to hold water. During use, the dead corners within the housing, such as the area where the bottom wall 110 and the side wall 120 meet, are most prone to limescale buildup and rust. Rust in these dead corners is difficult to clean. Forming the coating on the inner surface of the area where the bottom wall 110 and the side wall 120 meet effectively solves the problems of rust and limescale buildup after use. Furthermore, forming the coating only at the area where the bottom wall 110 and the side wall 120 meet, compared to forming the coating on both the inner surface of the area where the bottom wall 110 and the side wall 120 meet and the inner surface of the bottom wall, significantly reduces costs and facilitates the industrial application of this household appliance.

[0038] In other embodiments of the present invention, reference is made to Figure 4 The sidewall has water level lines spaced apart from bottom to top. The coating is formed on the bottom wall and the sidewall, and the coating 200 is formed at least on the lowest water level line L (it should be noted that only the position of the lowest water level line L is shown in the figure). This ensures that when the water in the receiving cavity is heated below the lowest water level line, it prevents household appliances from rusting and forming scale.

[0039] In other embodiments of the present invention, reference is made to Figures 5 to 8The household appliance also includes a heating device 300, which is disposed at the bottom of the receiving cavity. Since the heated portion of the household appliance is also prone to rust during use, in this embodiment, the coating 200 can be formed on the inner surface of the bottom wall 110 at the position corresponding to the heating device 300 (see structural schematic diagram). Figure 5 Therefore, by forming the coating 200 on the inner surface of the cavity corresponding to the location where rust is more likely to form, the household appliance is less prone to rust and scale buildup, and has good corrosion resistance. At the same time, it is low in cost and easy to industrialize.

[0040] According to embodiments of the present invention, the type of heating device 300 is not particularly limited; for example, it can be a heating plate, a heating mesh, etc. Therefore, it can be applied to a wide variety of household appliances, resulting in a broad range of applications.

[0041] In some other embodiments of the present invention, the coating 200 is formed on the inner surface of the bottom wall 110 at the position corresponding to the heating device 300, and on the inner surface of the position where the bottom wall 110 and the side wall 120 are connected (see structural schematic diagram). Figure 6 Since the inner surface of the housing cavity corresponding to the heating device 300 and the inner surface of the location where the bottom wall 110 and the side wall 120 are connected are the locations where scale and rust are more likely to form during the use of the household appliance, this embodiment can minimize the formation of scale and rust on the inner surface of the housing cavity of the household appliance while keeping costs low.

[0042] In some other embodiments of the invention, the coating 200 may also be formed on the entire inner surface of the receiving cavity (see schematic diagram). Figure 7 Therefore, since the coating 200 is formed on the entire inner surface of the receiving cavity, the corrosion resistance, rust resistance, and scale resistance of the household appliance can be optimized, and scale and rust are not easily generated on the entire inner surface of the receiving cavity. However, this embodiment is more expensive than the embodiment described above.

[0043] In some other embodiments of the present invention, the connection between the bottom wall 110 and the side wall 120 is smoothly transitioned (see structural schematic diagram). Figure 8Therefore, during the use of this household appliance, the inner surface where the bottom wall 110 and the side wall 120 connect is no longer a location prone to scale buildup or rust. Thus, in this embodiment, the coating 200 can be formed only on the inner surface of the bottom wall 110 corresponding to the heating device 300, i.e., the coating 200 is formed at the bottom of the receiving cavity. This further reduces the production cost of the household appliance, making it easier to industrialize, while ensuring that the appliance is less prone to scale buildup and rust after use.

[0044] In some other embodiments of the invention, the household appliance further includes a water supply pipe 400 connected to the receiving cavity, and the coating 200 is formed on at least a portion of the inner surface of the water supply pipe 400 (see schematic diagram). Figure 9 After prolonged use, scale easily forms on the inner surface of the water supply pipe 400 in household appliances. Excessive scale buildup can easily cause blockages in the water supply pipe 400. Furthermore, excessive scale can lead to corrosion on the inner surface of the water supply pipe 400, increasing the risk of rupture. If the water supply pipe ruptures, the household appliance is prone to electrical leakage when powered on, and in severe cases, it can even cause a fire. In this embodiment, the coating 200 is formed on the inner surface of the water supply pipe 400. Due to the good corrosion resistance and low surface energy of the quasi-crystalline material, scale formation on the inner surface of the water supply pipe 200 can be effectively inhibited, thus increasing the safety factor of the household appliance and making it suitable for practical applications.

[0045] According to embodiments of the present invention, the type of household appliance is not particularly limited, and may include, for example, a kettle, a health-preserving kettle, a garment steamer, a humidifier, or a water heater. Depending on the structure of the different types of household appliances, when the appliance is a kettle or a health-preserving kettle, the receiving cavity is the body of the kettle or health-preserving kettle, and the coating 200 may be formed on the inner surface of the location where the bottom wall 110 and the side wall 120 connect, or on the inner surface of the location corresponding to the heating device 300. In other embodiments of the present invention, the household appliance may be a garment steamer or a humidifier, and the receiving cavity is the evaporator of the garment steamer or humidifier, in which case the coating 200 may be formed on the entire inner surface of the receiving cavity or only on the inner surface of the bottom wall 110 at the location corresponding to the heating device. In still other embodiments of the present invention, the household appliance may be a water heater, and the water supply pipe 400 is the water pipe of the water heater. Therefore, the household appliance can be any kind of household appliance. As long as the coating 200 on the inner surface of the household appliance contains quasi-crystalline material, it can be ensured that the household appliance is not easy to rust or build up scale, and has good corrosion resistance.

[0046] According to an embodiment of the present invention, the coating 200 comprises a plurality of sub-coatings stacked sequentially from bottom to top, wherein at least two of the sub-coatings have different quasicrystalline material particle sizes, and the quasicrystalline material forming the uppermost sub-coating has the smallest particle size. (Refer to...) Figure 10 Taking the coating 200 as an example, which includes two sub-coatings 201a and 201b stacked sequentially from bottom to top, the particle size of the quasicrystalline material in sub-coating 201b is smaller than that in sub-coating 201a. Therefore, the coating can be further made to have good non-stick properties, low cost, simple preparation process, and easy industrialization.

[0047] In other embodiments of the invention, the coating 200 comprises a plurality of sub-coatings stacked sequentially from bottom to top, wherein the particle size of the quasicrystalline material in at least one of the sub-coatings is larger than the particle size of the quasicrystalline material in at least one sub-coating located above it. (Refer to...) Figure 10 Taking the coating 200 as an example, which includes two sub-coatings 201a and 201b stacked sequentially from bottom to top, the particle size of the quasicrystalline material in sub-coating 201b is smaller than that in sub-coating 201a. Therefore, the coating can be further made to have good non-stick properties, low cost, simple preparation process, and easy industrialization.

[0048] According to an embodiment of the present invention, preferably, the quasicrystalline material forming the uppermost sub-coating layer has the smallest particle size (it should be noted that "smallest" here means that among the quasicrystalline materials forming multiple sub-coating layers, the quasicrystalline material forming the uppermost sub-coating layer has the smallest particle size). Since the quasicrystalline material forming the uppermost sub-coating layer has the smallest particle size at this time, the uppermost sub-coating layer is more dense, which further improves the non-stick properties of the coating. Furthermore, the combination of large-particle-size quasicrystalline material and small-particle-size quasicrystalline material further enhances the wear resistance and non-stick properties of the formed coating, making it particularly suitable for use in cooking equipment.

[0049] According to an embodiment of the present invention, preferably, the quasicrystalline material forming the bottommost sub-coating layer has the largest particle size (it should be noted that "largest" here means that among the quasicrystalline materials forming multiple sub-coating layers, the quasicrystalline material forming the bottommost sub-coating layer has the largest particle size). Since the quasicrystalline material forming the bottommost sub-coating layer has the largest particle size at this time, the coating has a stronger bond with the substrate, and can further increase porosity, thereby further reducing thermal conductivity. This allows for more uniform heat conduction of the substrate and further reduces local overheating, thus further preventing scorching.

[0050] According to embodiments of the present invention, the description used herein as "the quasicrystalline materials forming the plurality of sub-coatings have different particle sizes" means that the particle size of the quasicrystalline materials forming the plurality of sub-coatings is such that it is sufficient to ensure that any two sub-coatings have different particle sizes.

[0051] According to embodiments of the present invention, the type, composition, and proportions of the quasicrystalline material are not particularly limited. In some embodiments of the present invention, the quasicrystalline material can be an Al-Cu-Fe-Cr quasicrystalline material, wherein the atomic ratio of Al (aluminum), Cu (copper), Fe (iron), and Cr (chromium) can be (60-70):(15-25):(5-15):(5-15). Therefore, the material is widely available, readily available, and has low cost, is easy to industrialize, and possesses high hardness and high wear resistance.

[0052] According to embodiments of the present invention, the content of quasicrystalline material in the coating 200 can be 20%-90%, for example, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc. This further results in a coating with good non-stick properties, low cost, simple preparation process, and ease of industrialization.

[0053] According to embodiments of the present invention, the porosity of the coating 200 can be 0.1%-20%. In some embodiments of the present invention, the porosity of the coating 200 can be 0.1%, 0.5%, 2%, 5%, 10%, 20%, etc. Therefore, the porosity of the coating 200 is relatively small, resulting in a larger contact angle, which further improves the non-stickiness of the coating 200. Furthermore, the porosity range of the coating 200 is moderate, providing reasonable porosity to reduce stress concentration and prevent cracking, while avoiding excessive porosity that could decrease coating hardness and wear resistance, thus affecting the durability of the coating 200.

[0054] Furthermore, in some embodiments of the present invention, the porosity of the coating is 0.5-5.0%. The inventors have discovered that when the coating has a certain porosity, it not only provides insulation, effectively preventing food from burning or charring due to excessively rapid heating or uneven local heating during the heating process, but also allows the coating to form a specular reflection overall and diffuse reflection on local surfaces, further reducing heat loss. Conversely, if the porosity of the coating is too high, it will affect the bonding force between the quasicrystalline layer and the bottom and sidewalls of the cavity, as well as its corrosion resistance to the bottom and sidewalls. Therefore, by controlling the porosity of the quasicrystalline layer to 0.5-5.0% in the present invention, the energy-saving effect can be further improved while ensuring that the quasicrystalline layer has non-stick and corrosion-resistant properties.

[0055] According to embodiments of the present invention, the thermal conductivity of the coating 200 can be 0.1-3 W / m·K. In some embodiments of the present invention, the thermal conductivity of the coating 200 can be 0.1 W / m·K, 0.2 W / m·K, 0.5 W / m·K, 1 W / m·K, 2 W / m·K, 3 W / m·K, etc. Therefore, the thermal conductivity of the coating 200 is suitable, allowing heat to be evenly distributed on the surface of the household appliance when heating it, resulting in good heating effect.

[0056] According to embodiments of the present invention, the thickness of the coating 200 can be 20-200 micrometers. In some specific embodiments of the present invention, the thickness of the coating 200 can be 20 micrometers, 40 micrometers, 60 micrometers, 80 micrometers, 100 micrometers, 120 micrometers, 140 micrometers, 160 micrometers, 180 micrometers, 200 micrometers, etc. Therefore, the coating 200 has a moderate thickness, ensuring good non-stick properties, wear resistance, and hardness, without causing material waste, resulting in low cost and ease of industrialization.

[0057] According to embodiments of the present invention, the surface roughness of the coating 200 is 0.08-1.25 micrometers. In some specific embodiments of the present invention, the surface roughness of the coating 200 can be 0.08 micrometers, 1 micrometer, 1.25 micrometers, etc. Therefore, the low surface roughness of the coating 200 further enhances its non-stick properties, making the household appliance less prone to rusting and scale formation after contact with water.

[0058] According to an embodiment of the present invention, the surface of the coating can be a silver reflective surface. In this invention, by making the surface of the coating a silver reflective surface, achieving a certain gloss level and controlling the gloss level Ra to be 0.08-1.25 μm, the coating can also reflect heat back to the food during cooking, similar to the silver layer on a thermos, thereby achieving energy saving. Thus, the inner liner not only has excellent and lasting non-stick properties, but also facilitates even heating of food during cooking while achieving energy-saving effects.

[0059] According to embodiments of the present invention, the quasicrystalline material has an icosahedral or tridecahedral microstructure. Therefore, the quasicrystalline coating formed on the surface of the quasicrystalline material exhibits high hardness and high wear resistance.

[0060] According to an embodiment of the present invention, the surface of the coating has an uneven structure. This allows the coating to exhibit both good hydrophobicity and non-stick properties.

[0061] According to embodiments of the present invention, the valence electron concentration of the quasicrystalline material can be 1.5-2.5. Furthermore, in some embodiments of the present invention, the valence electron concentration of the quasicrystalline material can be 1.6-1.86. In some specific embodiments of the present invention, the valence electron concentration of the quasicrystalline material can be 1.6, 1.7, 1.8, 1.86, etc. Therefore, when the alloy is prepared in the factory with a valence electron concentration within this range, the quasicrystalline content in the resulting coating 200 will be relatively high.

[0062] According to embodiments of the present invention, the material of the receiving cavity may include, but is not limited to, metal, ceramic, or plastic. The shape of the receiving cavity, as well as the specific shapes of the bottom wall 110 and the side wall 120, are not particularly limited, and those skilled in the art can flexibly choose according to needs. In some embodiments of the present invention, the material of the receiving cavity may be stainless steel, copper, aluminum, etc. Therefore, the household appliance described in the present invention can be any kind of household appliance used in daily life, and has a wide range of applications.

[0063] According to embodiments of the present invention, as long as the coating 200 contains a quasicrystalline material, the household appliance will not easily rust, will not easily form scale, and will have good corrosion resistance. Whether it contains other types of materials is not particularly limited. In some embodiments of the present invention, the coating 200 may be formed solely of a quasicrystalline material. This quasicrystalline material has good corrosion resistance and high hardness, resulting in excellent corrosion resistance of the coating and higher surface strength and durability for the household appliance. In other embodiments of the present invention, the coating 200 may include other types of materials besides the quasicrystalline material, such as Teflon and ceramic non-stick materials. Therefore, since Teflon and ceramic non-stick materials also have certain non-stick properties, the quasicrystalline material, in combination with Teflon and ceramic non-stick materials, further enhances the rust resistance and scale resistance of the household appliance.

[0064] In other embodiments of the present invention, the receiving cavity may also contain the quasicrystalline material at the position corresponding to the coating 200. Because the receiving cavity contains the quasicrystalline material, it can be ensured that even if the outer coating peels off or cracks, the quasicrystalline material in the receiving cavity can still prevent the household appliance from rusting, from forming scale, and has good corrosion resistance, thereby further improving the overall performance of the household appliance.

[0065] In other embodiments of the present invention, the quasicrystalline material may also be present in the bottom wall and / or side wall of the receiving cavity at the position corresponding to the coating 200. Because the bottom wall and / or side wall of the receiving cavity contains the quasicrystalline material, it can be ensured that even if the outer coating peels off or cracks, the quasicrystalline material in the bottom wall and / or side wall of the receiving cavity can still prevent the household appliance from rusting, from forming scale, and has good corrosion resistance, thereby further improving the overall performance of the household appliance.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A household appliance, characterized in that, include: A receiving cavity, the receiving cavity including a connected bottom wall and side walls, and the receiving cavity being used to receive water; A coating is formed on at least a portion of the inner surface of the receiving cavity, and the coating is formed of a quasicrystalline material; the surface roughness of the coating is 0.08-1.25 μm; the porosity of the coating is 0.1%-20%; The coating comprises multiple sub-coatings stacked sequentially from bottom to top. Wherein, the particle size of the quasicrystalline material in at least one of the sub-coatings is larger than the particle size of the quasicrystalline material in at least one of the sub-coatings located above it; A heating device is disposed at the bottom of the receiving cavity; The coating is formed on the inner surface of the bottom wall at the position corresponding to the heating device.

2. The household appliance according to claim 1, characterized in that, The sidewall has a water level line, the coating is formed on the bottom wall and the sidewall, and the coating is formed at least on the lowest water level line.

3. The household appliance according to claim 1, characterized in that, The coating surface is a silver reflective surface.

4. The household appliance according to claim 1, characterized in that, At the location corresponding to the coating, the bottom wall and / or sidewall contains the quasicrystalline material.

5. The household appliance according to claim 1, characterized in that, The coating is formed on the inner surface at the junction of the bottom wall and the side wall.

6. The household appliance according to claim 1 or 5, characterized in that, The coating is formed on the inner surface of the bottom wall.

7. The household appliance according to claim 1, characterized in that, The coating is formed on the entire inner surface of the receiving cavity.

8. The household appliance according to claim 1, characterized in that, It also includes a heating device disposed at the bottom of the receiving cavity, the connection between the bottom wall and the side wall is smoothly transitioned, and the coating is formed only on the inner surface of the bottom wall at the position corresponding to the heating device.

9. The household appliance according to claim 1, characterized in that, Also includes: A water supply pipeline connected to the receiving cavity, wherein the coating is formed on at least a portion of the inner surface of the water supply pipeline.

10. The household appliance according to claim 1, characterized in that, The household appliances mentioned are kettles, health pots, garment steamers, humidifiers, or water heaters.

11. The household appliance according to claim 1, characterized in that, The coating satisfies at least one of the following conditions: The thermal conductivity of the coating is 0.1-3 W / m·K; The coating has a thickness of 20-200 micrometers.

12. The household appliance according to claim 1, characterized in that, The coating surface has an uneven structure.

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