Liquid heater

Abstract

The utility model discloses a liquid heater which comprises a kettle body provided with a heating assembly and a kettle cover covered on the kettle body, the heating assembly comprises a heating disc used for heating liquid, the heating disc is contacted with the liquid through a heating surface, the heating surface is provided with a plurality of mutually independent pits, and the pits are densely distributed on the heating surface. The maximum inner diameter of each pit is A, and A is larger than 0.4 mm and smaller than 1 mm. The contact area between the heating disc and liquid is increased through the pits densely distributed on the heating surface, so that heat of the heating disc can be transmitted to the liquid more easily and quickly, heat loss is reduced, and heating efficiency is improved. And meanwhile, the surface tension of the liquid on the uneven heating surface is lower, so that bubbles generated by gasification and particulate matters in the liquid are extremely easy to separate from the heating surface in the liquid heating process, the noise during liquid heating is reduced, large particulate matters are prevented from being adhered to the heating disc as much as possible, and the use experience of a user is improved.

Description

A liquid heater Technical Field

[0001] This utility model belongs to the field of drinking water equipment, and specifically relates to a liquid heater. Background Technology

[0002] With the improvement of living standards, liquid heaters are being used more and more widely. Heating plates are heating elements installed on the bottom or side wall of common liquid heaters such as kettles and water heaters. Existing heating plates usually consist of heating tubes, heat conduction plates, and container walls. The heat conduction plates are used to evenly conduct the heat generated by the heating tubes to the container walls, so that the smooth surface of the container walls is heated to heat the liquid in contact with the container walls.

[0003] However, because the surface of the container wall that comes into contact with the liquid is too smooth, the contact area between the container wall and the liquid is limited by the size of the container wall, resulting in low heating efficiency. At the same time, during the heating process, the bubbles generated by the vaporization of the liquid are difficult to detach from the smooth container wall quickly, resulting in large bubbles that are relatively large when they detach from the container wall. This leads to large vibrations when the bubbles burst, resulting in loud noise when heating the liquid. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a liquid heater to solve the problem of low heating efficiency when heating liquids.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a liquid heater, comprising a pot body equipped with a heating element and a lid fitted onto the pot body. The heating element includes a heating plate for heating the liquid. The heating plate contacts the liquid through a heating surface. The heating surface has multiple independent pits, which are densely distributed to form a concave-convex structure. The maximum inner diameter of the pit is A, satisfying 0.4mm < A < 1mm. This technical solution has the following technical effects:

[0006] This invention features pits on the heating surface. These pits create an uneven surface on the side of the heating plate that contacts the liquid. For heating plates of the same size, a surface with an uneven structure has a larger surface area than a smooth surface. Therefore, the pits increase the contact area between the heating plate and the liquid, thus increasing the surface area of ​​the heating plate. More water is heated per unit time, making it easier and faster for the heat from the heating plate to be transferred to the liquid, reducing heat loss. In other words, with the same power, an uneven heating surface can improve heating efficiency. Meanwhile, the maximum diameter A of the pit must satisfy 0.4mm < A < 1mm. If A is less than 0.4mm, the inner diameter of the pit is too small. When the liquid is heated and vaporized to produce bubbles of the same size, the pit with a small inner diameter results in more contact points between the bubbles and the heating plate, and the contact area between the two is larger, which in turn increases the surface tension and makes it difficult for the bubbles to detach from the heating surface. If A is greater than 1mm, the inner diameter of the pit is too large. When the liquid is heated and vaporized to produce bubbles of the same size, the bubbles will contact the inner wall of the pit. The excessively large contact area is also not conducive to the bubbles detaching from the heating surface.

[0007] In this invention, the densely distributed pits can reduce the heat load on the heating surface, making the vaporization of the liquid more uniform and gradual. Compared with the surface tension of the liquid on a smooth heating surface, the surface tension of the liquid on an uneven heating surface is lower. Therefore, during the liquid heating process, the bubbles generated by vaporization and the particles in the liquid can easily detach from the heating surface. The bubbles detached from the heating surface are smaller, resulting in less vibration when the bubbles burst, thereby reducing the noise when heating the liquid and minimizing the adhesion of large particles to the heating plate, thus improving the user experience.

[0008] In the aforementioned liquid heater, the recess has at least a curved inner wall, which is concave from the side of the heating surface where the liquid is present to the side away from the liquid. This is to prevent the heating surface from bulging out of the cavity containing the liquid and encroaching on the space of the pot cavity, thereby increasing the contact area between the heating plate and the liquid while ensuring the volume of the pot cavity.

[0009] In the aforementioned liquid heater, the curved inner wall includes at least an arc-shaped sidewall, one side of which extends to the opening of the recess, and the other side extends to the bottom wall of the recess. This minimizes the possibility of sharp angles within the recess, preventing dust particles from accumulating inside and becoming difficult to clean, thus ensuring the cleanliness of the heating element.

[0010] In the aforementioned liquid heater, the heating surface is sandblasted to create pits, resulting in a dense distribution of multiple pits with varying inner diameters on the heating surface. Sandblasting makes the pits on the heating surface more uniform and the surface roughness more controllable.

[0011] In the aforementioned liquid heater, the inner walls of any two adjacent recesses intersect to form an upwardly convex edge on the heating surface. By configuring the recesses to be densely distributed on the heating surface, bubbles or particles generated during liquid heating only contact the edge of the heating surface; that is, the bubbles or particles have line contact with the heating surface. This significantly reduces the contact area between the bubbles or particles and the heating surface, thereby accelerating the separation speed between the bubbles and the heating surface, further reducing noise generated during liquid heating, and simultaneously reducing the probability of particles adhering to the heating surface.

[0012] In the aforementioned liquid heater, the width of the edge is smaller than the maximum inner diameter of the recess, in order to further reduce the contact area between the bubbles or particles in the liquid and the heating surface.

[0013] In the aforementioned liquid heater, the depth of the recess is H, satisfying H < A / 2. This is to prevent dust particles from getting trapped inside the recess due to excessive depth or small opening, ensuring the cleanliness of the heating surface.

[0014] In the aforementioned liquid heater, the surface roughness Ra of the heating surface satisfies 1μm < Ra < 12μm. By controlling the roughness Ra within the range of 1μm to 12μm, it is possible to avoid situations where Ra is too small, resulting in more contact points between the bubble and the heating plate, and a larger contact area, which is not conducive to the bubble detaching from the heating surface. Conversely, it is also possible to avoid situations where Ra is too large, resulting in more contact areas between the bubble and the heating plate, which is also not conducive to the bubble detaching from the heating surface.

[0015] In the aforementioned liquid heater, the kettle body has a kettle cavity for containing liquid, and the heating plate is located at the bottom of the kettle cavity or surrounds the outer periphery of the kettle cavity, making it widely applicable.

[0016] In the aforementioned liquid heater, the heating element further includes a heating tube, which is installed on the side of the heating plate away from the heating surface to heat the heating plate. Because the heating tube provides more stable and efficient heating, using the heating tube as the structure for heating the heating plate makes heating more efficient, the operation of the heating element safer and more reliable, and reduces assembly difficulty.

[0017] The features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 is a three-dimensional view of a bottom-heated liquid heater;

[0020] Figure 2 is a cross-sectional view of a bottom-heated liquid heater;

[0021] Figure 3 is a partial enlarged view of the heating surface;

[0022] Figure 4 is a schematic diagram of the processing of the heating surface;

[0023] Figure 5 is a partial cross-sectional view of the heating surface;

[0024] Figure 6 is a partial cross-sectional view of the heating surface when the micro-pit is too small;

[0025] Figure 7 is a partial cross-sectional view of the heating surface when the micro-pit is too large;

[0026] Figure 8 is a cross-sectional view of a liquid heater with sidewall heating;

[0027] Figure 9 is a cross-sectional view of a liquid heater that heats the bottom and side walls.

[0028] Figure label:

[0029] 110. Body of the pot; 120. Cavity of the pot;

[0030] 200. Liquid;

[0031] 300. Heating plate; 310. Heating surface; 311. Recess; 3111. Curved inner wall; 312. Edge;

[0032] 400. Heating element;

[0033] 500, bubbles;

[0034] 600, sandblasting nozzle. Detailed Implementation

[0035] 1. This utility model discloses a liquid heater, comprising a pot body equipped with a heating element and a lid fitted onto the pot body. The heating element includes a heating plate for heating the liquid. The heating plate contacts the liquid through a heating surface. The heating surface has multiple independent pits, which are densely distributed to form an uneven structure. The maximum inner diameter of the pit is A, satisfying 0.4mm < A < 1mm. This utility model, by setting pits on the heating surface, makes the side of the heating plate in contact with the liquid uneven. Because for the same size heating plate, the uneven heating surface has a larger surface area than a smooth heating surface, the densely distributed pits increase the contact area between the heating plate and the liquid, making it easier and faster to transfer heat from the heating plate to the liquid, reducing heat loss. That is, under the same power, the uneven heating surface can improve heating efficiency. Meanwhile, the densely packed pits can reduce the heat load on the heating surface, making the vaporization of the liquid more uniform and gradual. Compared with the surface tension of the liquid on a smooth heating surface, the surface tension of the liquid on an uneven heating surface is lower. Therefore, during the liquid heating process, the bubbles generated by vaporization and the particles in the liquid can easily detach from the heating surface. The bubbles that detach from the heating surface are smaller, resulting in less vibration when the bubbles burst, thereby reducing the noise when heating the liquid and minimizing the adhesion of large particles to the heating plate, thus improving the user experience.

[0036] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0037] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0039] In this utility model, 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 connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] Example 1:

[0042] A liquid heater, as shown in Figures 1 to 9, includes a pot body 110, a pot lid, and a heating element. The pot body 110 has a pot cavity 120 for holding liquid 200. The pot lid is placed on the pot body 110. The heating element is located at the bottom of the pot body 110 and includes a heating plate 300. The top surface of the heating plate 300 facing the pot cavity 120 above it is a heating surface 310. The heating plate 300 contacts the liquid 200 in the pot cavity 120 through the heating surface 310 to heat the liquid 200. Multiple pits 311 are provided on the heating surface 310, and the multiple pits 311 are densely distributed on the heating surface 310 to form an uneven structure on the heating surface 310.

[0043] This invention provides recesses 311 on the heating surface 310. The recesses 311 densely distributed on the heating surface 310 make the side of the heating plate 300 that contacts the liquid 200 uneven. Because the heating surface 310 with an uneven structure has a larger surface area than the smooth heating surface 310 on the same size heating plate 300, the recesses 311 densely distributed on the heating surface 310 increase the contact area between the heating plate 300 and the liquid 200, making it easier and faster for the heat from the heating plate 300 to be transferred to the liquid 200, reducing heat loss. That is, under the same power, the uneven heating surface 310 can improve heating efficiency. Meanwhile, the densely distributed pits 311 can reduce the heat load on the heating surface 310, making the vaporization of the liquid 200 more uniform and gradual. The surface tension of the liquid 200 on the uneven heating surface 310 is lower than that on the smooth heating surface 310. Therefore, during the heating process of the liquid 200, the bubbles 500 generated by vaporization and the particles in the liquid 200 can easily detach from the heating surface 310. The bubbles 500 detached from the heating surface 310 are small, resulting in less vibration when the bubbles 500 burst, thereby reducing the noise when heating the liquid 200 and also preventing large particles in the liquid from adhering to the heating plate 300, thus improving the user experience.

[0044] As shown in Figure 5, the maximum inner diameter of the recess 311 in this embodiment is A, satisfying 0.4mm < A < 1mm. As shown in Figure 6, if A is less than 0.4mm, the inner diameter of the recess 311 is too small. When the liquid 200 is heated and vaporized to produce bubbles 500 of the same size, the recess 311 with its small inner diameter results in more contact points between the bubbles 500 and the heating plate 300, leading to a larger contact area and thus greater surface tension, which is not conducive to the bubbles 500 detaching from the heating surface 310. As shown in Figure 7, if A is greater than 1mm, the inner diameter of the recess 311 is too large. When the liquid 200 is heated and vaporized to produce bubbles 500 of the same size, the bubbles 500 will contact the inner wall of the recess 311, and the excessively large contact area is also not conducive to the bubbles 500 detaching from the heating surface 310. The value of A can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9mm. In this embodiment, the depth of the pit 311 is H, which satisfies H < A / 2, that is, the cross-section of the pit 311 is a minor arc, so as to avoid the pit 311 being too deep or the opening of the pit 311 being too small, which would cause dust particles to be hidden in the pit 311 and difficult to clean, thus ensuring the cleanliness of the heating surface 310.

[0045] As shown in Figure 5, the recess 311 has at least a curved inner wall 3111. The curved inner wall 3111 is recessed from the side of the heating surface 310 where the liquid 200 is located to the side away from the liquid 200, so as to prevent the heating surface 310 from bulging out of the cavity containing the liquid 200 and encroaching on the space of the pot cavity 120. While ensuring the volume of the pot cavity 120, it increases the contact area between the heating plate 300 and the liquid 200. Preferably, the curved inner wall 3111 includes at least an arc-shaped sidewall. One side of the arc-shaped sidewall extends to the opening of the recess 311, and the other side extends to the bottom wall of the recess 311, so as to minimize the possibility of corners in the recess 311, avoid dust particles accumulating in the corners of the recess 311 and being difficult to clean, and ensure the cleanliness of the heating plate 300.

[0046] In this embodiment, the heating surface 310 is sandblasted to form pits 311, as shown in Figure 3, so that multiple pits 311 with different inner diameters are densely distributed on the heating surface 310. As shown in Figure 4, ceramic sand with a diameter of less than 1 mm is placed in the sandblasting nozzle 600, and the angle between the sandblasting nozzle 600 and the heating plate 300 is adjusted to a near-perpendicular state, that is, the angle α between the sandblasting nozzle 600 and the heating plate 300 is between 85° and 95°. A pressure of 0.6 MPa is used, and sandblasting is performed at a distance of 90 mm to 110 mm from the heating plate to obtain pits 311 of appropriate size. The sandblasting process makes the pits 311 on the heating surface 310 more uniform, and the roughness of the heating surface 310 more controllable.

[0047] In this embodiment, the tops of the inner walls of any two adjacent pits 311 intersect to form an upwardly protruding edge 312 on the heating surface 310. By setting the pits 311 to be densely distributed on the heating surface 310, the bubbles 500 generated by heating the liquid 200 or the particles in the liquid 200 only contact the edge 312 of the heating surface 310. Furthermore, the width of the edge 312 is smaller than the maximum inner diameter A of the pit 311, that is, the bubbles 500 or the particles are in line contact with the heating surface 310, which greatly reduces the contact area between the bubbles 500 or the particles and the heating surface 310, thereby accelerating the separation speed between the bubbles 500 and the heating surface 310, further reducing the noise generated during the heating of the liquid 200, and at the same time reducing the probability of particles adhering to the heating surface 310.

[0048] In this embodiment, the surface roughness Ra of the heating surface 310 satisfies 1μm < Ra < 12μm. By controlling the roughness Ra within the range of 1μm to 12μm, it is possible to avoid Ra being too small, resulting in more contact points between the bubble 500 and the heating plate 300, and a larger contact area, which would be detrimental to the bubble 500 detaching from the heating surface 310. It is also to avoid Ra being too large, resulting in more contact areas between the bubble 500 and the heating plate 300, which would also be detrimental to the bubble 500 detaching from the heating surface 310.

[0049] Table 1 shows the noise test data of a standard heating plate 300 and a heating plate 300 with a surface roughness Ra of 6±1μm under the same power and capacity test conditions:

[0050]

[0051] Table 1

[0052] As shown in Table 1, because the surface tension of the heating plate 300 with the pit 311 is smaller and the contact angle between the bubble 500 and the surface of the heating plate 300 is larger, the bubble 500 is easier to fall off. Therefore, the heating plate 300 with the pit 311 will produce less noise during the heating process.

[0053] Table 2 shows the noise test data of the hemispherical method for heating plates with different surface roughness under the same power and capacity test conditions:

[0054]

[0055] Table 2

[0056] As shown in Table 2, when the surface roughness Ra is controlled within the range of 1 μm to 12 μm, the noise generated is significantly less than that when Ra < 1 μm or Ra > 12 μm. Controlling the roughness Ra within the range of 1 μm to 12 μm can reduce the noise during the heating process.

[0057] In this embodiment, the heating component can have a heating film at the bottom of the heating plate or a heating wire laid at the bottom of the heating plate. Preferably, the heating component also includes a heating tube 400, which is installed on the side of the heating plate 300 away from the heating surface 310 to heat the heating plate 300. Because the heating tube 400 provides more stable and efficient heating, by using the heating tube 400 as the structure for heating the heating plate 300, the heating is more efficient, the operation of the heating component is safer and more reliable, and the assembly difficulty is reduced. In this embodiment, the heating plate 300 is located at the bottom of the pot cavity 120. Of course, it is understood that in another embodiment, as shown in FIG8, the heating plate 300 may also be located on the side of the pot cavity 120, with the heating surface 310 being annular and serving as the inner sidewall of the pot body to heat the liquid in the pot cavity 120; or, as shown in FIG9, the heating plate 300 may also be located on both the side and bottom of the pot cavity 120, with the heating surface 310 being an arc surface, serving as the inner sidewall and inner bottom wall of the pot body to heat the liquid in the pot cavity 120.

[0058] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A liquid heater, comprising a pot body equipped with a heating element and a lid fitted onto the pot body, wherein the heating element includes a heating plate for heating the liquid, characterized in that: The heating plate comes into contact with the liquid through a heating surface. The heating surface has multiple independent pits, which are densely distributed on the heating surface to form a concave-convex structure. The maximum inner diameter of the pit is A, which satisfies 0.4mm < A < 1mm.

2. A liquid heater according to claim 1, characterized in that: The recess has at least a curved inner wall, which is concave from the side of the heating surface where the liquid is present to the side away from the liquid.

3. A liquid heater according to claim 2, characterized in that: The curved inner wall includes at least an arc-shaped sidewall, one side of which extends to the opening of the pit and the other side extends to the bottom wall of the pit.

4. A liquid heater according to claim 1, characterized in that: The heating surface is sandblasted to form the pits, so that multiple pits with different inner diameters are densely distributed on the heating surface.

5. A liquid heater according to claim 4, characterized in that: The inner walls of any two adjacent recesses intersect to form an upwardly convex edge on the heating surface.

6. A liquid heater according to claim 5, characterized in that: The width of the edge is less than the maximum inner diameter of the recess.

7. A liquid heater according to claim 1, characterized in that: The depth of the pit is H, which satisfies H < A / 2.

8. A liquid heater according to claim 1, characterized in that: The surface roughness Ra of the heating surface satisfies 1μm < Ra < 12μm.

9. A liquid heater according to claim 1, characterized in that: The kettle body has a cavity for containing liquid, and the heating plate is located at the bottom of the cavity or surrounds the outer periphery of the cavity.

10. A liquid heater according to claim 9, characterized in that: The heating component also includes a heating tube, which is installed on the side of the heating plate away from the heating surface to heat the heating plate.

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