Heating device and household appliance

Abstract

The utility model provides a heating device and a household electrical appliance, and relates to the technical field of electrical appliance heating, the heating device comprises a first cover plate, a second cover plate, a heat conduction plate and a heating member which are sequentially attached and installed, and a continuous and partially-bent protrusion is formed on the first cover plate in the direction away from the second cover plate. A cavity capable of circulating fluid is formed between the inner cavity of the bulge and the second cover plate, and through holes communicated with the cavity are formed in the two ends of the bulge; the first cover plate is stamped to form the continuous protrusion, the continuous protrusion and the second cover plate are covered to form the continuous and partially-bent cavity, the cavity can achieve multiple times of heating of water on the first cover plate and the second cover plate in a continuous bending mode, and multiple times of heating of liquid can be achieved without winding of multiple sections of pipelines. The heating efficiency of the water body is kept, meanwhile, the difficulty required by processing is also reduced, and the cost required by production is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric appliance heating, and particularly relates to a heating device and a household appliance. Background Art

[0002] For household appliances, the heating device is usually an electric heating tube or a heating plate. An electric heating tube is a device that uses electric energy to generate heat. When an electric current passes through the electric heating tube, heat will be generated to heat water or liquid. To ensure the uniformity of water body heating, the electric heating can also be separated from the water body, so that a small amount of water body passes through the heating plate to achieve the heating rate of the water body and achieve the instant heating effect. These heating devices are usually used in electrical equipment such as thermal water dispensers, coffee machines, tea bar machines, and steam irons to heat water bodies or generate steam for use.

[0003] Currently, for the heating device of an electric appliance, to ensure the heating efficiency of the device water body, as proposed in "A PTC heater with high thermal energy utilization rate" with the Chinese patent publication number: CN219572294U, when in use, the liquid enters from the end of the first serpentine water pipe, is first heated by the PTC heating element, enters the second serpentine water pipe through the connecting pipe, and is secondarily heated by the PTC heating element, increasing the time for the liquid to flow through the PTC heating element and greatly improving the heating effect. However, in the above operation, it uses a serpentine water pipe to bend back and forth, increasing the contact times between the water pipe and the PTC heating element to improve the heating effect on the liquid in the water pipe. However, for each increase in the contact times between the water pipe and the PTC heating element, an additional section of water pipe is required, thereby increasing the material usage of the water pipe and making the production cost remain high. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model uses the protrusion of the first cover plate and the second cover plate to define a continuous and partially curved chamber, thereby replacing the contact times between the pipeline and the heating element. The specific technical solutions are as follows:

[0005] A heating device includes a first cover plate, a second cover plate, a heat conducting plate, and a heating element that are sequentially and fittingly installed. A continuous and partially curved protrusion is formed on the first cover plate in a direction away from the second cover plate, so that a chamber capable of flowing fluid is formed between the inner cavity of the protrusion and the second cover plate, and through holes communicating with the chamber are opened at both ends of the protrusion.

[0006] In an embodiment, the cross-section of the chamber is trapezoidal.

[0007] In an embodiment, the cross-sectional area of the chamber is S, and the value of S is 12 - 30 square millimeters.

[0008] In an embodiment, the inner bending radius of the curved part of the protrusion is R1, and the value of R1 is 3 - 10 mm.

[0009] In one embodiment, the inner bend of the convex bent portion is tangent to the joint surface of the second cover plate.

[0010] In one embodiment, the top end of the protrusion forms a platform for fitting the temperature sensing element.

[0011] In one embodiment, a temperature limiting element is installed on one side of the heat conducting plate that fits the heating element.

[0012] In one embodiment, the periphery of the first cover plate is folded and extended to the sides of the second cover plate and the heat conducting plate.

[0013] In one embodiment, the shape of the heating element is S-shaped, U-shaped, C-shaped or Z-shaped.

[0014] In one embodiment, the first cover plate, the second cover plate and the heat conducting plate are all made of metal materials.

[0015] A household appliance is provided with the above-mentioned heating device.

[0016] As can be seen from the above technical solutions, the present utility model has the following beneficial effects:

[0017] In the present utility model, a continuous protrusion is formed by stamping the first cover plate, and after being covered with the second cover plate, a continuous and partially bent chamber is formed. The chamber can realize multiple heating of water in a continuous bending manner on the first cover plate and the second cover plate, without using the winding of multiple sections of pipelines to realize multiple heating of liquid, maintaining the heating efficiency of the water body, reducing the processing difficulty, and greatly reducing the production cost.

[0018] The top end of the chamber is horizontally arranged, the temperature sensing element is attached to the top wall of the protrusion, and the area of the top wall is sufficient to fit the surface for temperature measurement of the temperature sensing element, increasing the accuracy of temperature measurement of the temperature sensing element. At the same time, after the water body in the chamber is heated, the steam is located at the top end of the chamber, and the temperature measurement method of attaching the temperature sensing element is more accurate. There is no need to extend the probe into the through hole of the water outlet to detect the temperature, reducing the trouble of subsequent installation and avoiding the influence of subsequent water scale on the accuracy of the probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded structural schematic diagram of the present utility model;

[0020] Figure 2 is a side sectional structural schematic diagram of the present utility model;

[0021] Figure 3 is a front sectional structural schematic diagram of the present utility model;

[0022] Figure 4 is a top view structural schematic diagram of the present utility model;

[0023] Figure 5 It is a schematic diagram of the structure of the utility model when viewed from above.

[0024] In the figure: 1. first cover plate; 2. second cover plate; 3. heat conducting plate; 4. heating element; 5. temperature limiting element; 6. faucet; 7. protrusion; 8. through hole; 9. chamber. DETAILED DESCRIPTION

[0025] The following is a detailed description of the present invention in conjunction with the accompanying drawings and specific embodiments. Before describing in detail the technical solutions of each embodiment of the present invention, the nouns and terms involved are explained. In this specification, components with the same name or the same number represent similar or identical structures and are only for illustrative purposes.

[0026] like Figures 1 - 5 As shown, a heating device comprises a first cover plate 1, a second cover plate 2, a heat conducting plate 3 and a heating element 4 which are sequentially fitted and installed. A continuous and partially curved protrusion 7 is formed on the first cover plate 1 in the direction away from the second cover plate 2, so that a chamber 9 capable of flowing fluid is formed between the inner cavity of the protrusion 7 and the second cover plate 2, and through holes 8 communicating with the chamber 9 are provided at both ends of the protrusion 7. Partial straight sections are provided on the protrusion 7, and the cooperation between the straight section and the curved section is used to increase the length of the protrusion 7 located on the first cover plate 1, preferably in a serpentine shape, such as the straight section is horizontally provided, and the curved section is located at the junction of adjacent straight sections. Through holes 8 are provided at both ends of the protrusion 7. After the first cover plate 1 and the second cover plate 2 are covered, the fluid in the chamber 9 can only flow from the through hole 8 at one end to the through hole 8 at the other end along the direction of the protrusion 7. Gas and liquid can be introduced into the chamber 9, and water is preferably introduced into the chamber 9, and the water flows in the chamber 9. The heating element 4 generates heat and transfers the heat to the chamber 9 through the heat conducting plate 3 and the second cover plate 2 in sequence, heating the cold water flowing in the chamber 9. At the same time, the cold water flowing in the chamber 9 can also be heated to form steam, so that the hot water or steam flows out from the through hole 8 at the other end; the chamber 9 realizes multiple heating of the water body in a continuous bending manner on the first cover plate 1 and the second cover plate 2, and there is no need to use the winding of multiple sections of pipes to realize multiple heating of the liquid, which reduces the difficulty required for processing and also greatly reduces the cost required for production.

[0027] The top of the protrusion 7 forms a platform for fitting the temperature sensing component, and the side wall opposite to the chamber 9 and the second cover plate 2 is arranged horizontally, that is, the top of the chamber 9 is arranged horizontally, and the horizontally arranged side wall is fitted with a temperature sensing component, and the temperature sensing component is fitted to the top wall of the protrusion 7. The area of the top wall is sufficient to fit the temperature measurement surface of the temperature sensing component, thereby increasing the temperature measurement accuracy of the temperature sensing component. At the same time, after the water in the chamber 9 is heated, the steam is located at the top of the chamber 9. The temperature measurement method of the temperature sensing component is more accurate, and there is no need to extend the probe into the through hole of the water outlet to detect the temperature, thereby reducing the trouble of subsequent installation and avoiding the influence of subsequent scale on the probe accuracy.

[0028] likeFigure 1 As shown, a water nozzle 6 communicating with the chamber 9 is installed in the through hole 8. The water nozzle 6 is preferably laser welded at the through hole 8. One end of the water nozzle 6 is used to introduce cold water into the chamber 9. When the cold water passes through the chamber 9, it is heated by the heat of the second cover plate 2. The water body is heated and discharged from the water nozzle 6 at the other end along the chamber 9 for subsequent use of the heated water body.

[0029] As Figures 2 - 4 shown, the cross section of the chamber 9 is trapezoidal, square or arched to ensure that the top of the chamber 9 is horizontal. Among them, the top of the arched cross section is horizontal, and the side is arc-shaped. The horizontal top surface can facilitate the fitting with the temperature sensing element, increase the fitting area between the temperature sensing element and the top wall of the protrusion 7, and increase the accuracy of temperature measurement by the temperature sensing element. Among them, the trapezoid is preferred because the heating surface of the chamber 9 is larger than the top, that is, the fitting range between the chamber 9 and the second cover plate 2 is wider, increasing the heating area of the cold water flowing in the chamber 9 and improving the heating rate of the water body, so as to achieve instant heating. Among them, the cross-sectional area of the chamber 9 is S, and the value of S is 12 - 30 square millimeters, preferably 16 - 24 square millimeters, which can ensure the uniformity of cold water heating in the chamber 9, improve the heating effect of the water body in the chamber 9, so as not to affect the heating effect of cold water due to too much cold water in the chamber 9, and at the same time ensure that the area of the cross section S of the chamber 9 is sufficient to allow scale impurities to flow out of the chamber 9. The top of the trapezoidal cross section of the chamber 9 is used to fit and install the temperature sensing element. The temperature sensing element indirectly detects the temperature of the steam or water body at the top in the chamber 9 by detecting the temperature at the top of the protrusion 7. The horizontal setting method can increase the fitting area with the temperature sensing element and further improve the detection accuracy. The inner bending radius of the bent part of the protrusion 7 is R1, and the value of R1 is 3 - 10 mm, preferably 5 - 8 mm. The specific value can be selected according to the height of the protrusion 7. Since this application limits the cross-sectional size of the chamber 9 inside the protrusion 7 to ensure the uniformity of cold water heating in the chamber 9 and achieve the instant heating effect, the value of R1 is selected as 5 - 8 mm. At the same time, the setting of R1 can increase the contact area between the cross section of the chamber 9 where the protrusion 7 is located in the bent section and the second cover plate 2, further increasing the heating surface of the chamber 9. At the same time, after the setting of R1, it can effectively avoid the difficult transition at R1 during the stamping process of the first cover plate 1, resulting in the stamping rupture of the protrusion 7 at R1 and affecting the forming.

[0030] As Figure 1 shown, the heat conducting plate 3 is installed between the second cover plate 2 and the heating element 4 by welding. Preferably, the second cover plate 2, the heat conducting plate 3 and the heating element 4 are sequentially fitted and fastened together by brazing process. The heating element 4 generates heat and transfers the heat to the heat conducting plate 3. The heat conducting plate 3 transfers the heat to the second cover plate 2. After the second cover plate 2 is heated, it transfers the heat into the chamber 9 to heat the cold water in the chamber 9. The heat conducting plate 3 makes the second cover plate 2 uniformly heated, improving the uniformity of water body heating.

[0031] As Figure 2 andFigure 3 As shown, the periphery of the first cover plate 1 is folded and extended to the side of the second cover plate 2 to form a folded edge. The folded edge is used to wrap the peripheries of the second cover plate 2 and the heat conducting plate 3, playing a limiting role on the second cover plate 2 and the heat conducting plate 3, so as to prevent relative movement between the first cover plate 1 and the second cover plate 2 during welding and affect the accuracy of welding; the height of the folded edge is greater than the thickness of the second cover plate 2. When welding, the top of the protrusion 7 is pressed, which is convenient for simultaneously limiting the first cover plate 1, the second cover plate 2 and the heat conducting plate 3, and helps subsequent spot welding positioning; at the same time, the second cover plate 2, the heat conducting plate 3 and the heating element 4 are sequentially attached to each other and fastened together by a brazing process. The setting of the folded edge helps to overcome the deformation problem during the forming and welding processes.

[0032] As Figure 1 、 Figure 4 and Figure 5 shown, the heating element 4 preferably uses an electric heating method. The shape of the heating element 4 can be S-shaped, U-shaped, C-shaped or Z-shaped to increase the fitting area. A temperature limiting element 5 is installed on one side of the heat conducting plate 3 that fits the heating element 4. The temperature limiting element 5 is located in the area surrounded by the heating element 4, which can save installation space. The temperature limiting element 5 is fixed on the heat conducting plate 3, that is, the temperature limiting element 5 is fixed and attached to the heat conducting plate 3 by screws. The types of the temperature limiting element 5 are not limited. It can be an electronic temperature controller, such as an NTC thermistor electronic temperature controller, or a mechanical temperature controller, such as a snap-action mechanical temperature controller. The temperature sensing element can use an NTC thermistor to fit on the top of the protrusion 7 for temperature measurement.

[0033] The first cover plate 1, the second cover plate 2 and the heat conducting plate 3 are all made of metal materials. Among them, the first cover plate 1 and the second cover plate 2 are preferably made of stainless steel materials, and the heat conducting plate 3 is preferably made of pure aluminum material.

[0034] During the whole installation, the temperature sensing element is installed in the electrical appliance through a bracket. The temperature sensing element fits on the horizontal part of the top of the protrusion 7, increasing the fitting area between the temperature sensing element and the protrusion 7 and improving the temperature measurement accuracy of the temperature sensing element. At the same time, after the water body in the chamber 9 is heated, the steam is located at the top of the chamber 9. The temperature measurement method of the temperature sensing element fitting is more accurate, and there is no need to extend the probe into the through hole of the water outlet to detect the temperature, reducing the trouble of subsequent installation and avoiding the influence of subsequent water scale on the probe accuracy.

[0035] This heating device is used in household appliances, and the electrical appliances include but are not limited to clothes steamers, electric irons, steam mops, steam wallpaper pasting machines, coffee makers, milk powder dispensers, instant hot water kettles, water dispensers, steam pressure cookers, steam rice cookers, electric steam ovens, steam ovens, steam blenders, electric steamers, steam air fryers, dishwashers and washing machines.

[0036] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A heating device, characterized in that, include: A first cover plate (1), a second cover plate (2), a heat conducting plate (3) and a heating element (4) are sequentially mounted and attached, wherein a continuous and partially curved protrusion (7) is formed on the first cover plate (1) in a direction away from the second cover plate (2), so that a chamber (9) capable of flowing a fluid is formed between the inner cavity of the protrusion (7) and the second cover plate (2), and through holes (8) communicating with the chamber (9) are provided at both ends of the protrusion (7).

2. The heating device according to claim 1, wherein The cross section of the chamber (9) is trapezoidal.

3. The heating device according to claim 1 or 2, characterized in that, The cross-sectional area of the chamber (9) is S, and the value of S is 12-30 square millimeters.

4. The heating device according to claim 1, characterized in that, The inner curvature radius of the curved portion of the protrusion (7) is R1, and the value of R1 is 3-10 mm.

5. The heating device according to claim 4, wherein, The inner curve of the curved portion of the protrusion (7) is tangent to the fitting surface of the second cover plate (2).

6. The heating device according to claim 1, characterized in that, The top of the protrusion (7) forms a platform that fits the temperature sensing element.

7. The heating device according to claim 1, characterized in that, A temperature limiting component (5) is installed on one side of the heat conducting plate (3) that is in contact with the heating component (4).

8. The heating device according to claim 1, characterized in that, The shape of the heating element (4) is S-shaped, U-shaped, C-shaped or Z-shaped.

9. The heating device according to claim 1, wherein The first cover plate (1), the second cover plate (2) and the heat conducting plate (3) are all made of hardware materials.

10. A household appliance, characterized in that, The household appliance is equipped with a heating device as described in any one of claims 1-9.

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