Cooking utensil and manufacturing method of water passing pipe for cooking utensil

Abstract

The invention discloses a cooking utensil and a manufacturing method of a water passing pipe for the cooking utensil, the cooking utensil comprises a shell, an inner container, the water passing pipe and a heating module, the inner container is arranged in the shell; the water passing pipe is arranged in the shell and attached to the inner container, the water passing pipe comprises a water passing inner pipe body and a water passing outer pipe body, the water passing inner pipe body is sleeved with the water passing outer pipe body, and the heat conductivity of the water passing outer pipe body is higher than that of the water passing inner pipe body; the heating module is arranged in the shell and used for heating the water passing pipe and the inner container. According to the cooking utensil, the heating efficiency of the water passing pipe and the liquid in the inner container can be improved.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a cooking appliance and a method for manufacturing a water pipe for the cooking appliance. Background Technology

[0002] Existing cooking appliances typically have a water pipe that connects to the inner cavity. A heating device can simultaneously heat both the water pipe and the bottom of the inner cavity to improve the heating efficiency of the appliance. However, because water needs to flow through the water pipe, the pipe is usually made of stainless steel, which has poor thermal conductivity and cannot heat the liquid inside the water pipe more quickly and efficiently. Summary of the Invention

[0003] The main objective of this invention is to provide a cooking appliance that improves the heating efficiency of the water pipe and the liquid inside the inner pot.

[0004] To achieve the above objectives, the present invention proposes a cooking appliance comprising a shell, an inner pot, a water inlet pipe, and a heating module; the inner pot is disposed within the shell; the water inlet pipe is disposed within the shell and is fitted to the inner pot, the water inlet pipe comprising an inner water inlet pipe and an outer water inlet pipe, the outer water inlet pipe being sleeved over the inner water inlet pipe, the outer water inlet pipe having higher thermal conductivity than the inner water inlet pipe; the heating module is disposed within the shell, the heating module being used to heat the water inlet pipe and the inner pot.

[0005] In one embodiment, the outer wall surface of the inner water-passing pipe and the inner wall surface of the outer water-passing pipe are in contact.

[0006] In one embodiment, the wall thickness of the water-passing outer pipe is 0.2mm-5mm.

[0007] In one embodiment, the inner water-passing pipe is made of stainless steel, and / or the outer water-passing pipe is made of aluminum.

[0008] In one embodiment, the length of the inner water passage pipe is longer than the length of the outer water passage pipe.

[0009] In one embodiment, the water pipe is arranged in a spiral or curved shape.

[0010] In one embodiment, the high thermal conductivity material is a metallic material, a carbon material, or a ceramic material, wherein the metallic material is any one of aluminum, copper, iron, and magnesium, or a mixture thereof.

[0011] In one embodiment, the outer water-passing pipe is tightly fitted onto the inner water-passing pipe through a stretching process or a rolling compression process, or the inner water-passing pipe is bonded to the outer water-passing pipe through a pipe expansion process.

[0012] In one embodiment, the water pipe is formed by coiling a straight water pipe into a conical spiral shape and then pressing it together to form a spiral disc, or the water pipe is arranged in a curved manner.

[0013] In one embodiment, the spiral-shaped water pipe has a first end located on the inner side and a second end located on the outer side, and the outer walls of the water pipe are in contact with each other in the winding direction from the first end to the second end.

[0014] In one embodiment, the cooking appliance further includes a heat-conducting aluminum plate, which is attached to the inner pot and located between the inner pot and the water pipe.

[0015] In one embodiment, the cooking appliance is a liquid heating container, a rice cooker, a blender, a soymilk maker, or an electric steamer.

[0016] The present invention also proposes a method for manufacturing a water pipe for cooking appliances, comprising the following steps:

[0017] Insert the inner water pipe into the outer water pipe;

[0018] The inner wall of the outer water-passing pipe is made to fit the outer wall of the inner water-passing pipe through stretching, expanding, or rolling compression processes.

[0019] The inner and outer water pipes, which are attached to each other on the wall, are wound together to form a shape.

[0020] In one embodiment, the step of making the inner wall of the outer water pipe fit with the outer wall of the inner water pipe through stretching, expanding or rolling compression processes specifically includes:

[0021] The inner water-passing pipe is fixed, and the outer water-passing pipe is stretched to make the inner wall of the outer water-passing pipe fit snugly against the outer wall of the inner water-passing pipe; or,

[0022] The outer water pipe is fixed, and the inner water pipe is expanded to make the inner wall of the outer water pipe fit snugly against the outer wall of the inner water pipe; or,

[0023] The inner water pipe is fixed, and the outer water pipe is subjected to a rolling compression process to make the inner wall of the outer water pipe fit against the outer wall of the inner water pipe.

[0024] In one embodiment, the step of forming the inner and outer water-passing pipes with their walls touching each other specifically includes:

[0025] The outer and inner water pipes are attached to each other to form a water pipe, which is then wound into a conical spiral shape.

[0026] In one embodiment, the outer water pipe and the inner water pipe are attached to each other to form a water pipe. After the step of winding the water pipe into a conical spiral shape, the method further includes:

[0027] The conical spiral water pipe is pressed together to make it into a spiral disc shape.

[0028] In one embodiment, after the step of forming the inner and outer water-passing pipes with their walls touching each other, the method further includes:

[0029] The inner and outer water-passing pipes, after being wound and formed, undergo a shaping process to give them mating surfaces for use with the heating module.

[0030] In one embodiment, the cross-sectional shape of the water pipe is trapezoidal, rectangular, or racetrack-shaped.

[0031] The cooking appliance of the present invention includes a shell, an inner pot, a water inlet pipe, and a heating module. The inner pot is disposed within the shell. The water inlet pipe is disposed within the shell and fits snugly against the inner pot. The water inlet pipe includes an inner water inlet pipe and an outer water inlet pipe, with the outer water inlet pipe sleeved over the inner water inlet pipe. The thermal conductivity of the outer water inlet pipe is higher than that of the inner water inlet pipe. The heating module is disposed within the shell and is used to heat the water inlet pipe and the inner pot. By configuring the water inlet pipe as an inner and outer water inlet pipe with the outer water inlet pipe having a higher thermal conductivity than the inner water inlet pipe, heat transfer efficiency can be improved, as can the heating efficiency of the liquid in the water inlet pipe and the heating efficiency of the liquid in the inner pot. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of an embodiment of the cooking utensil of the present invention;

[0034] Figure 2 This is a cross-sectional view of the water pipe of the cooking appliance of the present invention;

[0035] Figure 3 for Figure 2 A cross-sectional view of the water pipe from another angle;

[0036] Figure 4 This is a schematic diagram of the structure of the cooking appliance of the present invention when the water pipe is wound in a conical spiral shape;

[0037] Figure 5 for Figure 4 A structural schematic diagram of the water pipe from another perspective;

[0038] Figure 6 This is a schematic diagram of the spiral-shaped water pipe of the cooking appliance of the present invention.

[0039] Figure 7 This is a flowchart of an embodiment of the method for manufacturing the water pipe of the present invention.

[0040] Explanation of icon numbers:

[0041] label name label name 10 Cooking utensils 210 Water inlet pipe 100 Inner liner 220 Water supply pipe 200 water pipe 300 heating element 201 First end 400 thermally conductive aluminum plate 202 Second end

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0046] This invention proposes an embodiment of a cooking appliance, which can be a household appliance such as an electric kettle, rice cooker, or electric steamer, wherein the liquid heater can be a coffee pot, health pot, or electric kettle, etc.

[0047] Please see Figures 1 to 3In one embodiment of the present invention, the cooking appliance includes a shell, an inner pot 100, a water pipe 200, and a heating module 300; the inner pot 100 is disposed within the shell; the water pipe 200 is disposed within the shell and fits against the inner pot 100, the water pipe 200 includes an inner water pipe 210 and an outer water pipe 220, the outer water pipe 220 is sleeved on the inner water pipe 210, and the thermal conductivity of the outer water pipe 220 is higher than that of the inner water pipe 210; the heating module 300 is disposed within the shell and is used to heat the water pipe 200 and the inner pot 100.

[0048] Specifically, the cooking appliance includes a shell and an inner pot 100 ( Figure 1 (The diagram shows the bottom wall of the inner pot). The inner pot 100 is installed inside the shell and forms a receiving cavity. The water pipe 200 is installed on one side of the inner pot 100, and the other side of the inner pot 100 is in contact with liquid or food. Both ends of the water pipe 200 are connected to the receiving cavity of the cooking appliance 10. When the user uses the cooking appliance 10, the water in the receiving cavity is connected to the water pipe 200, and the heating module 300 can heat both the water pipe 200 and the inner pot 100 simultaneously to improve the heating efficiency of the cooking appliance 10.

[0049] Please see Figure 2 and Figure 3 The water pipe 200 includes an inner water pipe 210 and an outer water pipe 220. The outer water pipe 220 is fitted over the outer wall of the inner water pipe 210. Both the inner water pipe 210 and the outer water pipe 220 have circular cross-sections to facilitate the manufacturing of the water pipe 200. Considering that the water pipe 200 needs to be in direct contact with the liquid, the inner water pipe 210 is made of stainless steel. The outer water pipe 220 is made of a high thermal conductivity material, meaning its thermal conductivity is higher than that of the inner water pipe 210, which further improves heat transfer efficiency, thereby increasing the heating efficiency of the water pipe 200 and the inner tank 100.

[0050] A heating module 300 is disposed inside the housing and is used to heat the water pipe 200 and the inner liner 100. Specifically, the heating module 300 can be fitted into the water pipe 200. When the heating module 300 heats the water pipe 200, heat is simultaneously transferred directly to the inner liner 100 through the water pipe 200, thereby achieving heating of both the water pipe 200 and the inner liner 100.

[0051] The heating module 300 and the water pipe 200 can be connected by welding, which provides good weld stability and prevents rusting. The heating module 300 has a common shape, such as a single ring, multiple rings, a U-shape, or a W-shape. The diameter of the heating module 300 is larger than the diameter of the inner water pipe 210, and the cross-section of the heating module 300 can be rectangular, trapezoidal, or racetrack-shaped. Preferably, the cross-section of the heating module 300 is trapezoidal. In this way, one heating module 300 can contact the surface of multiple turns of the water pipe 200, thereby transferring heat to the water pipe 200 and the inner tank 100. The heating module 300 has a contact surface that is connected to the water pipe 200, and this contact surface can be the bottom surface of the trapezoidal heating module 300.

[0052] Typically, the heating module 300 is a metal heating element, generally made of materials such as stainless steel tube, high-temperature magnesium oxide powder, and heating wire. It can be a high-temperature resistance wire evenly distributed inside a seamless stainless steel tube, with crystalline magnesium oxide powder, which has good thermal conductivity and insulation properties, filling the gaps. It has high thermal efficiency and uniform heating. When current flows through the high-temperature resistance wire, the generated heat diffuses through the magnesium oxide powder to the surface of the metal tube, and then is transferred to the heated part (i.e., the water pipe 200) or the air to achieve the purpose of heating. The specific principle of the heating module 300 can be understood by referring to relevant technologies, and will not be elaborated here.

[0053] Please continue reading. Figure 2 and Figure 3 The outer water-passing pipe 220 is fitted over the inner water-passing pipe 210, with a certain gap between them, or their walls can be fitted together. In one embodiment, the outer wall of the inner water-passing pipe 210 and the inner wall of the outer water-passing pipe 220 are fitted together. This arrangement ensures that the stainless steel inner water-passing pipe 210 and the aluminum outer water-passing pipe 220 are tightly connected without any excess air layer, resulting in better thermal conductivity and further improving the heating efficiency of the liquid inside the water-passing pipe 200.

[0054] Furthermore, the wall thickness of the outer water pipe 220 is 0.2mm-5mm. If the wall thickness of the outer water pipe 220 is too thick, it will affect the heat conduction capacity of the outer water pipe 220; if it is too thin, it will not achieve a good heat conduction effect. Therefore, the wall thickness range of the outer water pipe 220 is limited to 0.2mm-5mm, and its specific values ​​can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm.

[0055] Preferably, the wall thickness of the outer water-passing pipe 220 is 0.5mm-1mm. Within this range, the outer water-passing pipe 220 can ensure good thermal conductivity, providing a good heat conduction effect for the water-passing pipe 200. Specific values ​​can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm. Of course, considering the possibility of manufacturing errors in the water-passing pipe 200, the above-mentioned wall thickness values ​​for the outer water-passing pipe 220 are estimated values ​​and may have slight deviations from actual measurements, which are negligible.

[0056] In one embodiment, the inner water pipe 210 is made of stainless steel, and / or the outer water pipe 220 is made of aluminum. Specifically, the inner water pipe 210 is used for water supply, so its material is stainless steel. Aluminum is a silvery-white, lightweight metal that is corrosion-resistant, has low density, is lightweight, has good thermal conductivity, good electrical conductivity, and good ductility. Therefore, the outer water pipe 220 is made of aluminum to improve heat transfer efficiency and heating efficiency of the liquid inside the water pipe 200. Furthermore, aluminum is less expensive, and after heating stops, aluminum has less heat storage, resulting in lower water heating temperatures inside the stainless steel pipe and preventing the generation of steam.

[0057] Please see Figures 4 to 6 In one embodiment, the length of the inner water-passing pipe 210 is longer than the length of the outer water-passing pipe 220. Specifically, since the inner water-passing pipe 210 needs to communicate with the inner cavity (i.e., the receiving cavity) of the cooking appliance 10 so that the water in the receiving cavity can flow into the inner water-passing pipe 210 for heating, the length of the inner water-passing pipe 210 needs to be longer to communicate with the inner cavity of the cooking appliance 10. At the same time, to prevent the liquid in the inner water-passing pipe 210 from contacting the aluminum outer water-passing pipe 220 when the length of the inner water-passing pipe 210 is shorter than the length of the outer water-passing pipe 220, the length of the inner water-passing pipe 210 is set to be longer than the length of the outer water-passing pipe 220.

[0058] Please see Figure 1 and Figure 6 In one embodiment, the water pipe 200 is arranged in a spiral or curved shape. This arrangement ensures that the length of the water pipe 200 is sufficient within a limited space, allowing it to hold more liquid and simultaneously heat that liquid, thereby improving the overall heating efficiency of the cooking appliance 10.

[0059] In one embodiment, the outer water-passing pipe 220 is tightly fitted onto the inner water-passing pipe 210 through a stretching or rolling compression process, or the inner water-passing pipe 210 is fitted to the outer water-passing pipe 220 through a pipe-expanding process. Specifically, the forming process of the water-passing pipe 200 can be as follows: first, the inner water-passing pipe 210 is inserted into the outer water-passing pipe 220, and then the outer water-passing pipe 220 is stretched through a stretching process to form the water-passing pipe 200; or first, the inner water-passing pipe 210 is inserted into the outer water-passing pipe 220, and then the outer water-passing pipe 220 is reduced in diameter through a rolling compression process to form the water-passing pipe 200; or first, the inner water-passing pipe 210 is inserted into the outer water-passing pipe 220, and then the inner water-passing pipe 210 is expanded through a pipe-expanding process to form the water-passing pipe 200.

[0060] Please see Figures 4 to 7 Furthermore, the water pipe 200 is formed by coiling a straight water pipe 200 into a conical spiral shape and then pressing it together to form a spiral disc, or the water pipe 200 is bent. Specifically, the water pipe 200 is straight after being stretched. At this time, the two ends of the inner water pipe 210 are fixed, and then the outer water pipe 220 is stretched by the equipment so that the inner wall of the outer water pipe 220 is tightly fitted with the outer wall of the inner water pipe 210. At this time, the stretched outer water pipe 220 and the inner water pipe 210 form the water pipe 200. The formed water pipe 200 is then spirally bent into a conical spiral shape. At this time, the diameter of the water pipe 200 spiraling from one end to the other gradually decreases or increases, and the water pipe 200 as a whole is roughly conical. Then, the water pipe 200 is pressed together by the equipment so that the water pipe 200 is arranged in a spiral coil. It should be noted that the spiral water pipe 200 has a first end 201 on the inner side and a second end 202 on the outer side. In the winding direction from the first end 201 to the second end 202, the outer walls of the water pipe 200 are closely fitted together to ensure that the overall volume of the water pipe 200 is reasonable, the structure is compact, and it does not occupy extra space. It can ensure that the length of the water pipe 200 is long enough in a limited space, so that more liquid can be contained in the water pipe 200 and the liquid can be heated simultaneously to improve the overall heating efficiency of the cooking appliance 10. At the same time, it ensures that the water pipe 200 has good thermal conductivity, and the outer walls of the closely fitted water pipe 200 can transfer heat to each other. In another embodiment, the water pipe 200 can also be configured to be curved to ensure that the length of the water pipe 200 is long enough within a limited space, and that more liquid can be contained in the water pipe 200, and that part of the liquid can be heated simultaneously to improve the overall heating efficiency of the cooking appliance 10.

[0061] Please see Figure 1In one embodiment, the cooking appliance further includes a heat-conducting aluminum plate 400, which is attached to the inner pot 100 and located between the inner pot 100 and the water pipe 200. Specifically, one side of the heat-conducting aluminum plate 400 can be connected to the water pipe 200 by welding to ensure the stability of the connection between the heat-conducting aluminum plate 400 and the water pipe 200.

[0062] A heat-conducting aluminum plate 400 is attached to the inner pot 100 and located between the inner pot 100 and the water pipe 200. When the cooking appliance 10 is in operation, the heating module 300 transfers heat to the water pipe 200 and heats it. Simultaneously, because the outer surface of the water pipe 200 is made of aluminum and it is welded to the heat-conducting aluminum plate 400, the heat generated by the heating module 300 is also transferred to the heat-conducting aluminum plate 400, and ultimately from there to the inner pot 100, heating it. The heat-conducting aluminum plate 400, positioned between the inner pot 100 and the water pipe 200, ensures that the heat transferred from the water pipe 200 is evenly distributed to the inner pot 100, thus evenly heating the liquid or food within the cooking appliance 10's cavity.

[0063] In one embodiment, the cooking appliance is any one of a liquid heating container, a rice cooker, a blender, a soymilk maker, or an electric steamer. The liquid heating container can be an electric kettle, a rice cooker, or an electric steamer.

[0064] Please see Figure 7 The present invention also proposes a method for manufacturing a water inlet pipe 200 for a cooking utensil, the method comprising the following steps:

[0065] Step S1: Insert the inner water pipe 210 into the outer water pipe 220;

[0066] Step S2: The inner wall of the outer water pipe 220 is made to fit with the outer wall of the inner water pipe 210 by stretching, expanding or rolling compression processes.

[0067] Step S3: The inner water pipe 210 and the outer water pipe 220, whose walls are attached to each other, are wound together to form a shape.

[0068] Specifically, the first step involves inserting the inner water-passing tube 210 into the outer water-passing tube 220. This is a preliminary step before the water-passing tube 200 is formed. The inner water-passing tube 210 can be inserted into the outer water-passing tube 220 using equipment or manually, with a certain gap between the inner water-passing tube 210 and the outer water-passing tube 220 at this time. Subsequently, the inner wall of the outer water-passing tube 220 is brought into contact with the outer wall of the inner water-passing tube 210 through stretching, expanding, or rolling compression processes. At this point, the stretched outer water-passing tube 220 and the inner water-passing tube 210 form the water-passing tube 200, which is then wound and shaped for use in cooking utensils.

[0069] In one embodiment, the step of making the inner wall of the outer water pipe 220 fit with the outer wall of the inner water pipe 210 by stretching, expanding or rolling compression processes specifically includes:

[0070] S21. Fix the inner water pipe 210, and perform a stretching process on the outer water pipe 220 to make the inner wall of the outer water pipe 220 fit against the outer wall of the inner water pipe 210; or,

[0071] S22. Fix the outer water pipe 220 and perform a pipe expansion process on the inner water pipe 210 so that the inner wall of the outer water pipe 220 fits against the outer wall of the inner water pipe 210.

[0072] S23. Fix the inner water pipe 210 and perform a rolling compression process on the outer water pipe 220 so that the inner wall of the outer water pipe 220 fits against the outer wall of the inner water pipe 210.

[0073] Specifically, there are three processes for forming the water pipe 220. The first is to fix the inner water pipe 210 and stretch the outer water pipe 220 so that the inner wall of the outer water pipe 220 fits with the outer wall of the inner water pipe 210. The second is to fix the outer water pipe 220 and expand the inner water pipe 210 so that the inner wall of the outer water pipe 220 fits with the outer wall of the inner water pipe 210. The third is to fix the inner water pipe 210 and roll and compress the outer water pipe 220 so that the inner wall of the outer water pipe 220 fits with the outer wall of the inner water pipe 210.

[0074] In one embodiment, the step of forming the inner water pipe 210 and the outer water pipe 220 with their walls touching each other specifically includes:

[0075] S31, the outer water pipe 220 and the inner water pipe 210 are attached to each other to form a water pipe 200, and the water pipe 200 is wound into a conical spiral shape.

[0076] Specifically, the water pipe 200 is wound in a conical spiral shape to ensure that the overall volume of the water pipe 200 is reasonable, the structure is compact, and it does not occupy extra space. This ensures that the length of the water pipe 200 is long enough within a limited space, and that more liquid can be contained within the water pipe 200. This liquid is heated simultaneously to improve the overall heating efficiency of the cooking appliance. At the same time, it ensures that the water pipe 200 has good thermal conductivity, and the outer walls of the water pipes 200 that are in close contact with each other can transfer heat to each other.

[0077] Further, after the outer water pipe 220 and the inner water pipe 210 are attached to each other to form a water pipe 200, and the water pipe 200 is wound into a conical spiral shape, the method further includes:

[0078] S311. The conical spiral-shaped water pipe 200 is pressed together to form a spiral disc shape. Similarly, it should be noted that the spiral-shaped water pipe 200 has an inner first end 201 and an outer second end 202. In the winding direction from the first end 201 to the second end 202, the outer walls of the water pipe 200 are closely fitted together to ensure a reasonable overall volume and compact structure, without occupying additional space. This ensures that within a limited space, the length of the water pipe 200 is sufficient to hold more liquid and simultaneously heat that liquid, improving the overall heating efficiency of the cooking appliance. At the same time, it ensures good thermal conductivity, allowing heat transfer between the closely fitted outer walls of the water pipe 200. The inner water pipe 210 is made of stainless steel, and the outer water pipe 220 is made of aluminum. Specific implementation details of the water pipe 200 are found in the aforementioned embodiments and will not be repeated here.

[0079] In one embodiment, after the step of forming the inner water pipe 210 and the outer water pipe 220 with their walls abutting each other, the method further includes:

[0080] S32. The inner water pipe 210 and the outer water pipe 220 after winding and forming are shaped to give them mating surfaces for use with the heating module 300.

[0081] Specifically, after the inner water pipe 210 and the outer water pipe 220 are wound to form the water pipe 200, a shaping process is performed. Specifically, a mating surface is machined on the water pipe 200; this mating surface is a plane used to cooperate with the heating module 300 for heating. The heating module 300 and the water pipe 200 can be connected by welding, which provides good weld stability and prevents rusting. The heating module 300 can be tubular, with shapes commonly found in the market, such as single-ring, multi-ring, U-shaped, or W-shaped.

[0082] In one embodiment, the cross-sectional shape of the water pipe is trapezoidal, rectangular, or racetrack-shaped. Specifically, the diameter of the heating module 300 is larger than the diameter of the inner water pipe 210, and the cross-section of the heating module 300 can be trapezoidal, rectangular, or racetrack-shaped, etc., and the cross-sectional shape of the water pipe is also trapezoidal, rectangular, or racetrack-shaped, etc. Preferably, the cross-section of the heating module 300 is trapezoidal. In this way, the mating surface of the heating module 300 can contact the water pipe 200 over a larger area, thereby transferring heat to the water pipe 200.

[0083] The cooking appliance of the present invention includes a shell, an inner pot 100, a water pipe 200, and a heating module 300; the inner pot 100 is disposed inside the shell; the water pipe 200 is disposed inside the shell and fits against the inner pot 100, the water pipe 200 includes an inner water pipe 210 and an outer water pipe 220, the outer water pipe 220 is sleeved on the inner water pipe 210, and the thermal conductivity of the outer water pipe 220 is higher than that of the inner water pipe 210; the heating module 300 is disposed inside the shell, and the heating module 300 is used to heat the water pipe 200 and the inner pot 100. By configuring the water pipe 200 into an inner water pipe 210 and an outer water pipe 220 with an inner and outer casing, and by making the thermal conductivity of the outer water pipe 220 higher than that of the inner water pipe 210, the heat transfer efficiency can be improved, thereby increasing the heating efficiency of the water pipe 200 and the inner liner 100.

[0084] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A cooking appliance characterized by, The cooking appliance includes: case; The inner liner is disposed inside the shell; A water passage pipe is disposed within the shell and fits snugly against the inner liner. The water passage pipe includes an inner water passage pipe and an outer water passage pipe, with the outer water passage pipe sleeved over the inner water passage pipe. The thermal conductivity of the outer water passage pipe is higher than that of the inner water passage pipe. A heating module is disposed inside the housing, and the heating module is used to heat the water pipe and the inner tank.

2. The cooking appliance of claim 1, wherein, The outer wall surface of the inner water-passing pipe and the inner wall surface of the outer water-passing pipe are in contact.

3. The cooking appliance of claim 2, wherein, The wall thickness of the outer water pipe is 0.2mm-5mm.

4. The cooking appliance of claim 1, wherein, The inner water-passing pipe is made of stainless steel, and / or the outer water-passing pipe is made of aluminum.

5. The cooking appliance of claim 1, wherein, The length of the inner water passage pipe is longer than the length of the outer water passage pipe.

6. The cooking appliance of claim 1, wherein, The water pipe is arranged in a spiral or curved shape.

7. The cooking appliance of claim 1, wherein, The high thermal conductivity material is a metallic material, a carbon material, or a ceramic material, wherein the metallic material is any one of aluminum, copper, iron, and magnesium, or a mixture thereof.

8. The cooking appliance of claim 1, wherein, The outer water-passing pipe is tightly fitted to the inner water-passing pipe through a stretching process or a rolling compression process, or the inner water-passing pipe is bonded to the outer water-passing pipe through a pipe expansion process.

9. The cooking appliance of claim 8, wherein, The water pipe is formed by coiling a straight water pipe into a conical spiral shape and then pressing it together to form a spiral disc, or the water pipe is arranged in a curved manner.

10. The cooking appliance of claim 9, wherein, The spiral-shaped water pipe has a first end located on the inner side and a second end located on the outer side. The outer walls of the water pipe are in close contact with each other in the winding direction from the first end to the second end.

11. The cooking appliance as described in claim 1, characterized in that, The cooking appliance also includes a heat-conducting aluminum plate, which is attached to the inner pot and located between the inner pot and the water pipe.

12. The cooking appliance as described in claim 1, characterized in that, The cooking appliance is a liquid heating container, rice cooker, blender, soy milk maker, or electric steamer.

13. A method for manufacturing a water pipe for a cooking utensil, characterized in that, Includes the following steps: Insert the inner water pipe into the outer water pipe; The inner wall of the outer water-passing pipe is made to fit the outer wall of the inner water-passing pipe through stretching, expanding, or rolling compression processes. The inner and outer water pipes, which are attached to each other on the wall, are wound together to form a shape.

14. The method for manufacturing a water pipe for a cooking appliance as described in claim 13, characterized in that, The steps of making the inner wall of the outer water pipe fit with the outer wall of the inner water pipe through stretching, expanding or rolling compression processes specifically include: The inner water-passing pipe is fixed, and the outer water-passing pipe is stretched to make the inner wall of the outer water-passing pipe fit snugly against the outer wall of the inner water-passing pipe; or, The outer water pipe is fixed, and the inner water pipe is expanded to make the inner wall of the outer water pipe fit snugly against the outer wall of the inner water pipe; or, The inner water pipe is fixed, and the outer water pipe is subjected to a rolling compression process to make the inner wall of the outer water pipe fit against the outer wall of the inner water pipe.

15. The method for manufacturing a water pipe for a cooking appliance as described in claim 13, characterized in that, The step of forming the inner and outer water-passing pipes with their walls touching each other specifically includes: The outer and inner water pipes are attached to each other to form a water pipe, which is then wound into a conical spiral shape.

16. The method for manufacturing a water pipe for a cooking appliance as described in claim 15, characterized in that, After the step of connecting the outer water pipe and the inner water pipe to form a water pipe by being attached to each other, and winding the water pipe into a conical spiral shape, the method further includes: The conical spiral water pipe is pressed together to make it into a spiral disc shape.

17. The method for manufacturing a water pipe for a cooking appliance as described in claim 13, characterized in that, Following the step of forming the inner and outer water-passing pipes with their walls touching each other, the method further includes: The inner and outer water-passing pipes, after being wound and formed, undergo a shaping process to give them mating surfaces for use with the heating module.

18. The method for manufacturing a water pipe for a cooking appliance as described in claim 15, characterized in that, The cross-sectional shape of the water pipe is trapezoidal, rectangular, or racetrack-shaped.

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