Water heating device

Abstract

This water heating device is related to the technical field of clothing processing equipment. In order to solve the problem that the water heating effect of the conventional water heating device is poor, the water heating device includes a housing (1), a water inlet (11) and an outlet (12) on the housing, a heating tube is provided in the housing, and a superconducting material layer is provided on the outer surface of the heating tube, and the water inlet and outlet are respectively connected to both ends of the heating tube. Cold water is introduced into the heating tube, the water introduced into the heating tube is heated by the superconducting material layer, and the hot water or steam is discharged from the outlet and enters the clothes storage tube, thereby providing hot water for washing clothes or providing steam for clothing care. The superconducting material layer has the advantages of small thermal resistance, high heat exchange efficiency, and power saving, and furthermore, it can rapidly dissipate heat and become cold immediately after the power is cut off, and can instantly heat water and discharge it while entering, and water does not remain in the heating tube, the contact between the water and the heating tube is more uniform, and the residence time is longer, so that the hot water or steam generation speed is faster, the heat loss is smaller, and the efficiency is higher.

Description

[Technical Field]

[0001] This application claims priority to Chinese patent applications filed on February 21, 2022, with application number CN202210158339.9 and application number CN202210157045.4, and to Chinese patent applications filed on February 25, 2022, with application number CN202210190850.7 and application number CN202210179749.1, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of laundry treatment appliances, and specifically provides a water heating device. [Background technology]

[0003] Conventional clothing processing equipment, such as a combined washer-dryer or clothing care machine, has an internal water heating device to heat wash water or heat water to generate steam to remove wrinkles from clothing. Conventional water heating devices generally heat water using electric heating tubes or ceramic heaters, but conventional electric heating tubes have poor temperature controllability and high heat loss, while ceramic PCT heaters have issues such as a slow heating rate, low thermal conductivity, and severe attenuation. In conventional technology, water is heated by installing a superconducting heating wire inside the water heating device, but the water flow rate is relatively fast and the contact time with the superconducting heating wire is relatively short, so the water is not heated uniformly enough, resulting in a poor water heating effect.

[0004] Accordingly, there is a need in the technical field for a new water heating device to solve the problem of poor water heating effect of the conventional water heating device. Summary of the Invention

[0005] SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned technical problem, that is, the problem that the water heating effect of the conventional water heating device is poor.

[0006] In a first aspect, the present invention provides a water heating device comprising a housing, the housing having a water inlet and an outlet, a heating tube provided within the housing, a superconducting material layer provided on an outer surface of the heating tube, the water inlet and the outlet communicating with both ends of the heating tube, respectively.

[0007] In a preferred technical solution of the above-mentioned water heating device, the housing includes a box and a cover that can open and close the box, the water inlet is provided on one side wall of the box, the outlet is provided on the other side wall opposite the water inlet, and the heating pipe is provided within the box.

[0008] In a preferred technical solution of the water heating device, a spiral structure is provided in the heating pipe.

[0009] In a preferred technical solution of the above-mentioned water heating device, a first partition plate and a second partition plate are provided in the box, the first partition plate and the side wall on the water inlet side form a first water chamber, the second partition plate and the side wall on the outlet side form a second water chamber, the heating pipe is provided between the first partition plate and the second partition plate, a first pipe hole is provided in the first partition plate, and a second pipe hole is provided in the second partition plate, and both ends of the heating pipe are provided in the first pipe hole and the second pipe hole, respectively.

[0010] In the preferred technical solution of the water heating device, the heating tube is a heating glass tube, the number of the heating glass tubes is plural, and the plural heating glass tubes are arranged in parallel in the box.

[0011] In a preferred technical proposal of the above water heating device, a third partition plate is provided in the first water chamber, a fourth partition plate is provided in the second water chamber, the third partition plate divides the first water chamber into a plurality of first sub-water chambers, the fourth partition plate divides the second water chamber into a plurality of second sub-water chambers, and the plurality of heating glass tubes are connected in series via the first sub-water chamber and the second sub-water chamber.

[0012] In the preferred technical solution of the water heating device, one end of each of the plurality of heating glass tubes is connected in series with a first wire to form a live line terminal, and the other end is connected in series with a second wire to form a neutral line terminal.

[0013] In the preferred technical solution of the water heating device, a seal ring is provided between the first pipe hole and the heating pipe, and between the second pipe hole and the heating pipe.

[0014] In a preferred technical solution of the water heating device, the water inlet and the water outlet are disposed diagonally opposite each other.

[0015] In a preferred technical solution of the above water heating device, the spiral structure is a coil spring.

[0016] Those skilled in the art will understand that the water heating device of the present invention comprises a housing, the housing having a water inlet and an outlet, a heating tube provided within the housing, a superconducting material layer provided on the outer surface of the heating tube, and the water inlet and outlet communicating with both ends of the heating tube, respectively.

[0017] When the above technical solution is adopted, the water heating device of the present invention has a superconducting material layer on the outer surface of the heating tube, and heats the water in the heating tube by transferring heat from the superconducting material layer to the heating tube. Specifically, the water heating device of the present invention has two functions of generating hot water or steam by setting different heating temperatures. When using the water heating device, the water inlet of the water heating device is connected to a water source, the outlet is connected to the clothes storage tube of the combined washer-dryer machine, cold water is introduced into the heating tube, the water introduced into the heating tube is heated by the superconducting material layer, and the hot water or steam is discharged from the outlet into the clothes storage tube to provide hot water for washing clothes or steam for clothing care. The superconducting material layer has the advantages of low thermal resistance, high heat exchange efficiency, and power saving. Furthermore, it dissipates heat quickly and cools quickly when power is cut off, allowing the temperature to be automatically maintained constant. Because of its excellent temperature controllability, water is instantly heated as it flows and discharged as it enters, eliminating water residue and scale buildup in the heating tube. Furthermore, the superconducting material layer cools quickly after power is cut off, allowing for more accurate water temperature control. The water heating device of the present invention is safe and reliable because the heating tube separates the water from the electricity. The heating tube is sealed inside the housing, eliminating the risk of electric shock during use, ensuring greater safety for home appliances. The annular contact between the water and the heating tube ensures more uniform heating and a longer water retention time in the heating tube. The heating tube also provides a consistent heat retention effect, resulting in faster hot water or steam generation, lower heat loss, and higher efficiency. [Brief explanation of the drawings]

[0018] Preferred embodiments of the present invention will now be described in conjunction with the drawings, in which: [Figure 1] 1 is a perspective structural view of a water heating device according to the present invention; [Figure 2] 1 is a side view of a water heating device according to the present invention; [Figure 3] FIG. 3 is a cross-sectional structural view taken along line AA in FIG. 2. [Figure 4]FIG. 2 is a front view of the box of the water heating device of the present invention. [Figure 5] FIG. 2 is a perspective structural view of the box of the water heating device of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present invention will now be described with reference to the drawings. Those skilled in the art should understand that these embodiments are used only to explain the technical principles of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios. For example, although the present application will be described in connection with a combined washer-dryer machine, this is not intended to be limiting. The water heating device of the present invention may be applied to other clothing treatment appliances, such as washing machines, clothes dryers, or clothing care machines, and may also be applied to other appliances that require hot water or steam other than clothing treatment appliances.

[0020] In the description of the present invention, terms indicating directions or positional relationships, such as "upper," "inner," and "outer," are based on the directions or positional relationships shown in the drawings, but this is for ease of description only and does not indicate or imply that the device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be understood as limiting the present invention. In addition, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0021] Furthermore, in the description of the present invention, unless otherwise clearly specified or limited, the terms "attach" and "connect" should be understood in a broad sense, and may mean, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, directly connected, indirectly connected via an intermediate medium, or internally communicating between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0022] As shown in Figures 1 to 3, in order to solve the problem of the poor water heating effect of conventional water heating devices, the water heating device of the present invention comprises a housing 1, which is provided with a water inlet 11 and an outlet 12, and which is provided with a heating tube within the housing 1, preferably a heating glass tube 2, the outer surface of which is provided with a superconducting material layer, preferably plated with a superconducting material film, and the water inlet 11 and outlet 12 are connected to both ends of the heating glass tube 2. The superconducting material layer is made of 28 previously discovered elements, such as niobium, nickel, and chromium, as well as thousands of alloys and compounds, such as niobium-zirconium alloy, niobium-titanium alloy, and nickel-chromium alloy. The superconducting material layer may be plated on the outer surface of the heating glass tube 2, or may be directly fixed to the outer surface of the heating glass tube 2. Therefore, there is no limitation on the manner in which the superconducting material layer and the heating glass tube 2 are fixed, as long as the superconducting material layer can supply heat to the heating glass tube 2. Those skilled in the art can set it themselves as needed.

[0023] The advantage of this installation method is that the water heating device of the present invention has a superconducting material layer on the outside of the heating glass tube 2, and heats the water in the heating glass tube 2 by transferring heat from the superconducting material layer to the heating glass tube 2. Specifically, the water heating device of the present invention has two functions: generating hot water or steam by setting different heating temperatures. When using the water heating device, the water inlet 11 of the water heating device is connected to a water source, and the outlet 12 is connected to the clothes storage tube of the combined washer-dryer. Cold water is introduced into the heating glass tube 2, and the water flowing into the heating glass tube 2 is heated by the superconducting material layer. The hot water or steam is then discharged from the outlet 12 into the clothes storage tube, providing hot water for washing clothes or steam for clothing care. The superconducting material layer has the advantages of low thermal resistance, high heat exchange efficiency, and power saving. Furthermore, it dissipates heat quickly and cools quickly when the power is turned off, allowing the temperature to be automatically maintained constant. Because of its excellent temperature controllability, water is instantly heated as it flows through the heating glass tube 2 and discharged as it enters, eliminating any residual water or scale in the heating glass tube 2. Furthermore, the superconducting material layer cools quickly after the power is turned off, allowing for more accurate control of the water temperature. The water heating device of the present invention is safe and reliable because the heating glass tube separates the water from the electricity. The heating glass tube is sealed inside the housing, eliminating the risk of electric shock during use, ensuring greater safety for home appliances. The annular contact between the water and the heating glass tube 2 ensures more uniform heating and a longer water retention time within the heating glass tube 2. The heating tube also provides a consistent heat retention effect, resulting in faster hot water or steam generation, lower heat loss, and higher efficiency.

[0024] As shown in Figures 1 to 3, the direction of the arrow in Figure 3 indicates the direction of water flow. In a possible embodiment, the housing 1 has a rectangular parallelepiped structure. Specifically, the housing 1 includes a box 13 and a cover 14 that can open and close the box 13. The cover 14 and the box 13 are sealed together. Preferably, the cover 14 and the box 13 are both made of a polymer material and are sealed together by ultrasonic welding or fusion. The water inlet 11 is provided on one side wall of the box 13, and the outlet 12 is provided on the other side wall opposite the water inlet 11. Preferably, the water inlet 11 and the outlet 12 are disposed diagonally opposite each other. Furthermore, a first partition plate 131 and a second partition plate 132 are provided in the box 13, and a first water chamber 135 is formed by the first partition plate 131 and the side wall on the water inlet 11 side, and a second water chamber 136 is formed by the second partition plate 132 and the side wall on the outlet 12 side, and the heating glass tube 2 is provided between the first partition plate 131 and the second partition plate 132, and a first tube hole 1311 is provided in the first partition plate 131, and a second water chamber 136 is provided in the box 13. A second tube hole 1321 is provided in the partition plate 132. The heating glass tube 2 is a straight tube. Both ends of the heating glass tube 2 are respectively provided in the first tube hole 1311 and the second tube hole 1321 so that the heating glass tube 2 is suspended in the box 13. Preferably, seal rings 137 are provided between the heating glass tube 2 and the first tube hole 1311 and between the heating glass tube 2 and the second tube hole 1321. The number of heating glass tubes 2 is two or more. In this embodiment, the number of heating glass tubes 2 is five. The five heating glass tubes 2 are arranged side by side in the box 13. Referring to FIG. 5 , a spiral structure 3 is provided in the heating glass tube 2. Preferably, the spiral structure 3 is a coil spring. The number of heating glass tubes 2 may be three or six, and there is no limit to the number of heating glass tubes 2. Those skilled in the art can set it as needed. The outer surfaces of one end of the multiple heating glass tubes 2 are connected in series using a first wire to form a live line terminal 4, and the outer surfaces of the other ends are connected in series using a second wire to form a neutral line terminal 5, thereby supplying power to the superconducting material layer.The first wire and the second wire may be made of the same material or different materials. For example, the first wire and the second wire may both be copper wires or aluminum wires, but the first wire may be a copper wire and the second wire may be an aluminum wire.

[0025] The advantage of the above installation method is that the housing 1 is configured so that the box 13 and the cover 14 are connected, which makes it easier to install parts inside the housing 1, and the sealed connection prevents water leakage. Preferably, the cover 14 and the box 13 are both made of polymeric materials, and the cover 14 and the box 13 are fixed by ultrasonic welding or welding, which greatly improves the sealing performance between the cover 14 and the box 13. The first partition 131 and the sidewall near the water inlet 11 form a first water chamber 135, one end of the heated glass tube 2 communicates with the first water chamber 135, and the second partition 132 and the sidewall near the outlet 12 form a second water chamber 136, the other end of the heated glass tube 2 communicates with the second water chamber 136. Cold water enters the first water chamber 135 through the water inlet 11, diffuses within the first water chamber 135, and flows into each heated glass tube 2. The water is heated within the heated glass tube 2 to form hot water or hot steam, which then flows into the second water chamber 136. The collected water then enters the clothes storage tube through the outlet 12 for washing, care, and wrinkle removal. The heated glass tube 2 is suspended in the box 13, preventing contact with the inner wall of the box 13, which could cause an increase in temperature and potentially result in burns. Multiple heating glass tubes 2 are arranged in parallel within the box 13. During heating, users can control the number of heating glass tubes 2 activated by controlling the communication between a single heating glass tube 2 and the water chamber, providing greater operational flexibility. The water inlet 11 and outlet 12 are arranged diagonally opposite each other, lengthening the time the water remains in the heating glass tube 2 until it is fully heated to a predetermined temperature or fully evaporated before being discharged. This prevents water entering through the water inlet 11 from passing through the first water chamber 135, the heating glass tube 2, and the second water chamber 136 and directly exiting the outlet 12, resulting in insufficient heating. The seal ring 137 prevents water or steam from the water chamber from reentering the heating glass tube 2, further isolating the water from electricity and enhancing safety.The coil spring and the inner wall of the heating glass tube 2 form a spiral water flow path, and the water flows in a spiral inside the heating glass tube 2, realizing spiral transmission and flow of the water flow and realizing heating by swirling flow. During this process, the water is constantly mixed and comes into contact with the inner wall of the heating glass tube 2, so that it is quickly heated to hot water or hot steam in a short time, increasing the heating speed and efficiency without reducing the flow rate of the hot water or hot steam.

[0026] As shown in Figures 3 to 5, in a possible embodiment, a third partition plate 133 is provided in the first water chamber 135, and a fourth partition plate 134 is provided in the second water chamber 136, with the third partition plate 133 dividing the first water chamber 135 into a plurality of first sub-water chambers 1331, and the fourth partition plate 134 dividing the second water chamber 136 into a plurality of second sub-water chambers 1341, and the plurality of heating glass tubes 2 are connected in series via the first sub-water chambers 1331 and the second sub-water chambers 1341.

[0027] The advantages of the above installation method are that multiple heating glass tubes 2 are arranged in parallel within the box 13, and are connected in series via the first sub-water chamber 1331 and the second sub-water chamber 1341 to form a series water flow path, which allows the heating glass tubes 2 to be connected in parallel and the water channels to be connected in series, and further allows the heating glass tubes 2 to be compact and modularized, which is convenient for installation, transportation, maintenance and replacement. 3 and 4, the water flow direction indicated by the arrows is shown. Specifically, water entering through the water inlet 11 flows sequentially into each heating glass tube 2 and is heated. The first and second sub-water chambers 1331 and 1341 connect the parallel-arranged heating glass tubes 2 in series, and finally, hot water or hot steam is discharged through the outlet 12. This increases the residence time of water within the heating glass tube 2, increases the heating rate, and improves heating efficiency. When generating steam, the water travels a longer distance within the heating glass tube 2 after the series-connected heating glass tubes 2 are connected, allowing the water to evaporate more completely. The steam discharged from the outlet 12 contains fewer large water droplets, resulting in better clothing care. Similarly, when generating hot water, the water heating time is extended, improving heating efficiency.

[0028] Referring to FIG. 3, in a possible embodiment, a check valve (not shown) communicating with the outside of the combined washer-dryer is provided at the outlet 12 of the water heating device. The check valve is used to drain water remaining inside the heated glass tube 2 from the heated glass tube 2 after the power supply to the water heating device is cut off. This prevents the remaining water from being drained immediately when the combined washer-dryer has not been used for a long time, which could lead to the generation of unpleasant odors and bacteria.

[0029] In summary, the water heating device of the present invention connects multiple parallel-connected heating glass tubes 2 in series by communicating them with the first and second sub-water chambers 1331 and 1341 provided in the box 13. However, when the ends of the heating glass tubes are connected in series, arcs must be added to the heating glass tubes, which increases costs and makes installation and replacement difficult. In contrast, the present invention connects multiple heating glass tubes 2 in series using water chambers provided in the box 13, simplifying the structure of the heating glass tubes 2, reducing processing costs, and facilitating installation and replacement. The water heating device of the present invention has two functions: generating hot water or steam by setting different heating temperatures. That is, hot water or hot steam can be discharged from the outlet depending on the heating temperature, and used for washing or caring for clothes. Furthermore, the coil spring inside the heating glass tube 2 guides the water to flow in a spiral, thereby increasing heating efficiency and reducing electrical energy consumption. Furthermore, the heating by the superconducting material increases the safety of heating the water. Furthermore, the heating glass tube 2 separates the water and electricity, further increasing the safety of the water heating device, meeting user needs and improving the user experience.

[0030] As mentioned in the first paragraph of this section, the above embodiment is only used to describe the principles of the present invention and is not intended to limit the scope of the present invention; those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios without departing from the principles of the present invention.

[0031] For example, in alternative embodiments, the spiral structure 3 may be a coil spring or a non-elastic spiral structure 3, the spiral structure 3 may be continuously arranged in the heated glass tube 2, or multiple spiral structures 3 may be intermittently arranged in the heated glass tube 2, and the material of the spiral structure 3 may be a metal material or a plastic material, so there is no limitation on the specific structure of the spiral structure 3, and all of these do not deviate from the principles of the present invention and are therefore within the scope of the present invention.

[0032] For example, in alternative embodiments, the shape of the housing 1 may be a rectangular parallelepiped or other shapes such as a cylindrical structure, the material of the box 13 and the cover 14 may be a polymer material to further reduce the weight of the water heating apparatus, but this is not limiting, the box 13 and the cover 14 may be made of an aluminum alloy plate or an iron plate, and the box 13 and the cover 14 may be connected by screws. Specifically, a sealing groove is provided on the periphery of the box 13, and a sealing ring is provided in the sealing groove. After the box 13 and the cover 14 are connected by screws, the edge of the cover 14 abuts against the sealing ring to perform a sealing function. Furthermore, the number of water inlets 11 and outlets 12 may be one or more, and can be set by a person skilled in the art according to needs. The water inlets 11 and outlets 12 may protrude from the outer surface of the housing 1 or may be directly provided on the outer surface of the housing 1. The water inlets 11 and outlets 12 may be provided on two adjacent side walls of the box 13, respectively. The shapes of the water inlets 11 and outlets 12 may be circular or other shapes such as square. All of these adjustments do not deviate from the principles of the present invention and are therefore within the scope of the present invention.

[0033] For example, in alternative embodiments, the heating tube may be a ceramic tube or a plastic tube in addition to the heating glass tube 2, and the diameters of the heating tubes may be the same or different, or the diameter of each heating tube may gradually increase or decrease along the water flow direction. Therefore, there is no limitation on the material and diameter of the heating tube, as long as the heating tube can transfer the heat of the superconducting material layer to its interior. All of these adjustments do not deviate from the principles of the present invention, and are therefore within the scope of the present invention.

[0034] For example, in alternative embodiments, the water channel may be formed by connecting the head and tail of the heated glass tube 2 in series, or multiple heated glass tubes 2 may be connected in series by connecting the head and tail of glass tubes of the same shape, or multiple heated glass tubes 2 may be connected in series by connecting the head and tail of glass tubes of different shapes, and both ends of the series channel may be directly connected to the water inlet 11 and outlet 12, respectively, or may be connected to the first water chamber 135 and the second water chamber 136, respectively. In addition, the shape of the heated glass tube 2 may be a straight tube, a spiral tube that matches the shape of the spiral structure 3, or an S-shaped tube, so there is no limitation on the shape of the heated glass tube 2, and all of these adjustments do not deviate from the principles of the present invention and are within the scope of the present invention.

[0035] For example, in an alternative embodiment, the thickness of the superconducting material layer on the heating glass tube 2 gradually decreases along the direction of water flow. Specifically, the thickness of the superconducting material layer can be varied as needed, and different thicknesses of the superconducting material layer on different segments of the heating glass tube 2 result in different water heating efficiencies at different positions on the heating glass tube 2. Due to friction, the flow rate of water becomes slower as the water flows, i.e., the contact time between the water flow and the heating glass tube 2 becomes longer. Accordingly, by gradually decreasing the thickness of the superconducting material layer on the heating glass tube 2, the water heating efficiency at different positions within the heating glass tube 2 can be made consistent and the water temperature can be more easily controlled. All of these adjustments do not deviate from the principles of the present invention and are therefore within the scope of the present invention.

[0036] For example, in an alternative embodiment, one end of the heated glass tube 2 passes through the first tube hole 1311 and enters the first water chamber 135, and the other end passes through the second tube hole 1321 and enters the second water chamber 136; all of these adjustments do not deviate from the principles of the present invention and are therefore within the scope of the present invention.

[0037] Although the technical solution of the present invention has been described above based on the preferred embodiments shown in the accompanying drawings, those skilled in the art can easily understand that the scope of protection of the present invention is obviously not limited to these specific embodiments. As long as it does not deviate from the principle of the present invention, those skilled in the art can make equivalent modifications or substitutions to the relevant technical features, and these modified or substituted technical solutions will all fall within the scope of the present invention. [Explanation of symbols]

[0038] 1. Housing 11 Water inlet 12 Exit 13 Box 131 First Partition 1311 First Pipe Hole 132 Second partition 1321 Second Pipe Hole 133 Third Partition 1331 First Sub-Water Chamber 134 Fourth Partition 1341 Second Sub-Water Chamber 135 First Water Chamber 136 Second Water Chamber 137 Seal Ring 14 Cover 2 heating glass tubes 3 Spiral structure 4 Live Line Terminals 5 Neutral wire terminal

Claims

1. a housing, the housing being provided with a water inlet and an outlet, a heating tube being provided within the housing, a superconducting material layer being provided on an outer surface of the heating tube, the water inlet and the outlet being connected to both ends of the heating tube, respectively; the housing includes a box and a cover that can open and close the box, the water inlet is provided on one side wall of the box, the outlet is provided on the other side wall opposite the water inlet, and the heating pipe is provided inside the box; a first partition plate and a second partition plate are provided in the box, the first partition plate and a side wall on the water inlet side form a first water chamber, the second partition plate and a side wall on the outlet side form a second water chamber, the heating pipe is provided between the first partition plate and the second partition plate, a first pipe hole is provided in the first partition plate, a second pipe hole is provided in the second partition plate, and both ends of the heating pipe are provided in the first pipe hole and the second pipe hole, respectively, the heating tube is a heating glass tube, the number of the heating glass tubes is plural, and the plural heating glass tubes are arranged side by side in the box; a third partition plate is provided in the first water chamber, a fourth partition plate is provided in the second water chamber, the third partition plate divides the first water chamber into a plurality of first sub-water chambers, the fourth partition plate divides the second water chamber into a plurality of second sub-water chambers, and the plurality of heating glass tubes are connected in series via the first sub-water chamber and the second sub-water chamber; A water heating device characterized by:

2. The water heating device according to claim 1, wherein a spiral structure is provided inside the heating pipe.

3. 2. The water heating device according to claim 1, wherein one end of each of the plurality of heating glass tubes is connected in series using a first wire to form a live wire terminal, and the other end is connected in series using a second wire to form a neutral wire terminal.

4. 2. The water heating device according to claim 1, wherein a seal ring is provided between the first pipe hole and the heating pipe and between the second pipe hole and the heating pipe.

5. 2. The water heating device according to claim 1, wherein the water inlet and the water outlet are disposed diagonally opposite each other.

6. 3. The water heating device according to claim 2, wherein the spiral structure is a coil spring.

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