A water heater

Abstract

This utility model belongs to the field of thermal electrical appliance technology, specifically disclosing a water heater. The water heater includes a water tank, an outer pipe, an end seal, a heat-conducting medium, and a heating element. The outer pipe is located inside the water tank, with its first end connected to the inner wall of the tank and its second end having a filling port. The end seal is detachably connected to the second end of the outer pipe and seals the filling port, creating a closed heat-conducting space inside the outer pipe. The heat-conducting medium is placed within this space. The heating element includes an electric heating element and a terminal connected to the end of the electric heating element. The electric heating element heats the heat-conducting medium, and the terminal is located at the first end of the outer pipe and extends outside the water tank. This utility model enables the heating of running water, reduces noise during water heater operation, and improves the user experience.

Description

Technical Field

[0001] This utility model relates to the field of thermal electrical appliances, and in particular to a water heater. Background Technology

[0002] Water heaters are generally classified into electric water heaters and gas water heaters based on their heating method. Existing heat exchange electric water heaters typically include a water tank, a heating element, and a heat exchanger. The water tank is connected to the outside environment and contains a heat exchange medium. The heating element heats this medium, and domestic water exchanges heat with the heat exchange medium through the heat exchanger, thus heating the water. However, heat exchange electric water heaters generate significant noise during the heating process, affecting the user experience. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a water heater that can reduce the noise during use.

[0004] The above-mentioned technical problems are solved by the following technical solutions:

[0005] A water heater, comprising:

[0006] A water tank, wherein a heat exchange medium is provided inside the water tank;

[0007] An outer tube is located inside the water tank and in contact with the heat exchange medium. The first end of the outer tube is connected to the inner wall of the water tank, and the second end of the outer tube is provided with a filling port.

[0008] An end seal is detachably connected to the second end of the outer tube and seals the filling port to form a closed heat-conducting space inside the outer tube;

[0009] A heat-conducting medium is disposed in the heat-conducting space;

[0010] The heating element includes an electric heating tube and a terminal connected to the end of the electric heating tube. The electric heating tube is used to heat the heat-conducting medium. The terminal is located at the first end of the outer tube and extends out of the water tank.

[0011] Compared with the prior art, the water heater described in this utility model has the following advantages: By setting an outer tube on the outside of the heating element, and filling the space between the outer tube and the heating element with a heat-conducting medium, when the heating element is energized and heating, the heat from the heating element is conducted to the outer tube through the heat-conducting medium, and then to the heat exchange medium in the water tank through the wall of the outer tube. The sealing of the outer tube ensures that the heating area of ​​the heating element is under pressure during heating, which can suppress the bubbles generated during heating, thereby reducing the noise generated by the heating element assembly during heating, thus reducing the noise of the water heater during operation and improving the user experience. Simultaneously, the filling port and wiring terminals are located on opposite sides of the outer tube, which helps to reduce the outer diameter of the outer tube, thereby reducing the overall footprint of the heating element assembly, improving the compactness of the internal structure of the water heater, and effectively preventing excessive spacing between the heating element and the outer tube while the heat-conducting medium wraps around the heating element, thus facilitating the outward conduction of heat generated by the heating element and improving heating efficiency.

[0012] In one embodiment, the outer tube includes a tube body and a first end plate connected to a first end of the tube body, the end seal is installed at a second end of the tube body, the tube body abuts against the inner wall of the water tank, the terminal is connected to the first end plate, and the first end of the outer tube is welded to the inner wall of the water tank or the first end plate is detachably connected to the water tank.

[0013] In one embodiment, the first end plate is recessed in the direction toward the heat-conducting space to form a threaded cylindrical portion, the threaded cylindrical portion having an internal threaded hole located outside the heat-conducting space, the water tank is provided with a mounting through hole, the mounting through hole is directly opposite to and communicates with the internal threaded hole, and the water tank and the outer pipe are connected by threaded fasteners passing through the internal threaded hole and the mounting through hole.

[0014] In one embodiment, the water heater further includes an insulating component, which includes an insulating plate portion and two sheath portions protruding from the insulating plate portion. The insulating plate portion is sandwiched between the first end plate and the inner wall of the water tank, and the sheath portions extend out of the water tank. The two wiring terminals are respectively inserted through the two sheath portions.

[0015] In one embodiment, the first end plate includes an end plate portion, the threaded cylinder portion protruding from the end plate portion on the side facing the heat conduction space, and a boss portion protruding from the side of the end plate portion away from the heat conduction space. The number and position of the boss portions correspond to those of the threaded cylinder portions. The internal threaded hole passes through the boss portion, and the insulating plate portion is sandwiched between the boss portion and the inner wall of the water tank.

[0016] In one embodiment, the edge of the insulating plate portion is provided with a protruding ring portion protruding in the direction toward the first end plate, and the protruding ring portion abuts against the end plate portion;

[0017] And / or, the insulating plate portion is provided with a positioning ring portion protruding in the direction toward the heat conduction space, and the boss portion is inserted into the positioning ring portion.

[0018] In one embodiment, the outer tube has a retaining ring portion surrounding the outer side of the first end plate, the water heater includes a sealing ring sandwiched between the first end plate and the inner wall of the water tank, and the sealing ring is sleeved between the retaining ring portion and the insulating member.

[0019] In one embodiment, the first end of the outer tube is open and welded to the inner wall of the water tank.

[0020] In one embodiment, the inner wall of the water tank is provided with a positioning protrusion protruding inward, the positioning protrusion being inserted into the first end of the outer tube and welded to the outer tube.

[0021] In one embodiment, the second end of the outer tube has a second end plate, the second end plate protruding in a direction away from the heat conduction space is provided with an installation cylinder portion, the filling port extends from the installation cylinder portion to penetrate the second end plate, and the end seal is detachably connected to the installation cylinder portion. Attached Figure Description

[0022] Figure 1 This is a structural cross-sectional view of the water heater provided in Embodiment 1 of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of a section at point I;

[0024] Figure 3 for Figure 1 A magnified view of a section at point J;

[0025] Figure 4 This is a schematic diagram of the structure of the electric heating tube assembly provided in Embodiment 1 of this utility model;

[0026] Figure 5 A cross-sectional view of the heating element assembly provided in Embodiment 1 of this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the insulating component provided in Embodiment 1 of this utility model;

[0028] Figure 7 This is a structural cross-sectional view of the water heater provided in Embodiment 2 of this utility model;

[0029] Figure 8 for Figure 7 A magnified view of the area at point K.

[0030] Label Explanation:

[0031] 100. Heating element assembly; 200. Heat exchanger; 300. Water tank; 301. First end cap; 3011. Positioning protrusion; 3012. Mounting through hole; 3013. Hole flange; 302. Second end cap;

[0032] 1. Outer tube; 11. Tube body; 12. First end plate; 121. End plate section; 122. Boss section; 13. Second end plate; 14. Mounting cylinder section; 15. Threaded cylinder section; 16. Heat conduction space; 17. Retaining ring section; 18. Internal threaded hole;

[0033] 2. End seal; 21. End sleeve; 22. Sealing plug; 221. Plug body; 222. Sealing protrusion;

[0034] 3. Heating element; 31. Electric heating element; 32. Wiring terminal;

[0035] 4. Insulating component; 41. Insulating plate portion; 42. Raised ring portion; 43. Sheath portion; 44. Positioning ring portion;

[0036] 5. Sealing ring; 6. Mounting bracket. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In existing heat exchange electric water heaters, the water tank is connected to the outside environment. During the heating process, because the heating element wall is in direct contact with cold water, the wall becomes instantly hot after power is applied. The thin layer of water adhering to the wall heats up rapidly and produces local boiling, which causes the surface of the heating element to vaporize and form tiny bubbles. Since the water tank is at normal pressure, the bubbles grow rapidly. When the bubbles detach and enter the cooler heat exchange medium, they collapse (rupture) instantly, resulting in significant noise during the heating process and affecting the user experience of the electric water heater.

[0042] Example 1

[0043] This embodiment provides a water heater to reduce the noise during operation and improve the user experience.

[0044] like Figures 1 to 6 As shown, in this embodiment, the water heater includes a water tank 300 and an electric heating element assembly 100. The water tank 300 contains a heat exchange medium, and the electric heating element assembly 100 includes an outer tube 1, a heating element 3, and an end seal 2. The outer tube 1 is located inside the water tank 300 and in contact with the heat exchange medium. The first end of the outer tube 1 is connected to the inner wall of the water tank 300, and the second end of the outer tube 1 has a filling port. The end seal 2 is detachably connected to the second end of the outer tube 1 and seals the filling port, forming a closed heat-conducting space 16 inside the outer tube 1, in which the heat-conducting medium is disposed. The heating element 3 includes an electric heating element 31 and a terminal 32 connected to the end of the electric heating element 31. The electric heating element 31 is used to heat the heat-conducting medium, and the terminal 32 is located at the first end of the outer tube 1 and extends outside the water tank 300.

[0045] The water heater provided in this embodiment uses an outer tube 1 installed outside the heating element 31, with a heat-conducting medium filling the space between the outer tube 1 and the heating element 31. When the heating element 31 is energized and heats up, the heat from the heating element 31 is conducted to the outer tube 1 through the heat-conducting medium, and then to the heat exchange medium in the water tank 300 through the wall of the outer tube 1. In other words, the heat is first conducted and buffered inside the outer tube 1, and then evenly conducted to the wall of the outer tube 1. Because the temperature rise of the outer tube wall is gradual, the probability of single-point ultra-high temperature is effectively reduced, thereby reducing the probability of violent vaporization bubbles caused by localized micro-boiling. Furthermore, the sealing design of the outer tube 1 ensures that the heating area of ​​the heating element 31 is under pressure during the heating process. The high pressure environment (above atmospheric pressure) inhibits the formation and growth of bubbles. The bubbles are small in size before collapsing and have weak collapse energy, which can reduce the noise generated by the heating element assembly 100 during heating, thereby reducing the noise of the water heater during operation and improving the user experience. At the same time, the filling port and the wiring terminal 32 are located on opposite sides of the outer tube 1, which helps to reduce the outer diameter of the outer tube 1, thereby reducing the overall footprint of the heating element assembly 100, improving the compactness of the internal structure of the water heater, and effectively preventing the gap between the heating element 31 and the outer tube 1 from being too large while the heat-conducting medium wraps around the heating element 31, thus facilitating the conduction of heat generated by the heating element 31 to the outside and improving the heating efficiency.

[0046] The water heater also includes a heat exchanger 200, a cold water pipe, and a hot water pipe. A water tank 300 has a receiving cavity, within which the heat exchanger 200 is located. The inlet end of the heat exchanger 200 is connected to the cold water pipe, and the outlet end is connected to the hot water pipe. An electric heating element assembly 100 is located within the receiving cavity, which contains a heat exchange medium that surrounds the heat exchanger 200. The electric heating element assembly 100 heats the heat exchanger 200. When the water heater is running, the electric heating element assembly 100 heats the heat exchange medium in the water tank 300, thereby raising its temperature. Cold water enters the heat exchanger 200 through the cold water pipe and exchanges heat with the heat exchange medium at the heat exchanger 200. The water in the heat exchanger 200 heats up to form hot water, which then flows out through the hot water pipe.

[0047] In other embodiments, the water tank 300 is provided with a cold water pipe and a hot water pipe. Water flows into the water tank 300 through the cold water pipe and is heated by the electric heating tube assembly 100 before flowing out through the outlet pipe. That is, in other embodiments, the water heater may not be equipped with a heat exchanger 200.

[0048] In one embodiment, the heating element assembly 100 is disposed below the heat exchanger 200 and at the bottom of the water tank 300. The water inlet of the heat exchanger 200 is located below the water tank 300, and the water outlet is located above the water tank 300. This allows the heating element assembly 100 to first heat the heat exchange medium located in the lower part of the water tank 300, where the area is relatively high-temperature. When cold water enters the heat exchanger 200, it first flows in the lower part to exchange heat with the lower heat exchange medium. As the water flows from the lower part of the water tank 300 to the upper part, the temperature of the heat exchange medium in the upper part of the water tank 300 is relatively low, while the temperature of the water in the upper part of the heat exchanger 200 is relatively high. This allows the heat exchanger 200 to fully absorb the heat of the heat exchange medium, improving the temperature uniformity throughout the heat exchange medium. In other embodiments, the heating element assembly 100 may also be disposed in other locations.

[0049] It is worth noting that the water tank 300, heat exchanger 200 and other structures of the water heater can be set with reference to the existing structure. This is not the focus of this utility model. This embodiment only limits the structure of the electric heating tube assembly 100.

[0050] The water tank 300 has a first end cap 301 and a second end cap 302 disposed opposite to each other in a first direction. The first end of the outer tube 1 is connected to the first end cap 301, and the end seal 2 abuts against the second end cap 302. That is, the electric heating tube assembly 100 is arranged along the first direction. In one embodiment, two electric heating tube assemblies 100 are spaced apart along the second direction to improve the heating efficiency of the heat exchange medium, thereby improving the heating efficiency of the water heater.

[0051] like Figure 1 , Figure 4 and Figure 5 As shown, in order to further improve the safety of the use of the electric heating tube assembly 100, in one embodiment, the axis of the outer tube 1 is set horizontally, and the axis of the electric heating tube 31 is aligned with or lower than the axis of the outer tube 1, so as to ensure that the electric heating tube 31 is set in the center or lower relative to the outer tube 1, so as to ensure that the electric heating tube 31 is immersed in the heat-conducting medium.

[0052] In one embodiment, the heating element 31 is U-shaped and includes two straight tube sections spaced apart in a second direction and a bent tube section connected between one end of the two straight tube sections. A wiring terminal 32 is provided at the second end of each of the two straight tube sections. Positioning the two straight tube sections opposite each other in the second direction ensures sufficient space for the heating element 31, ensuring that the axes of both straight tube sections are lower than or flush with the axis of the outer tube 1, thus guaranteeing the thermally conductive medium's coverage of the heating element 31.

[0053] Specifically, the heating element 31 includes a tube section, a heating wire disposed inside the tube section, and an insulating medium filling the tube section. The two ends of the heating wire are respectively connected to two terminals. It is worth noting that the structure of the heating element 31 and the mating structure between the heating element 31 and the terminal 32 can be based on existing technology.

[0054] In one embodiment, a mounting bracket 6 is provided inside the outer tube 1. The mounting bracket 6 has a through support hole near the second end of the outer tube 1. Both straight sections of the heating element 31 are inserted into the support hole, thereby supporting the heating element 31 with the mounting bracket 6, ensuring the stability of the heating element 3 on the outer tube 1, and improving the structural stability of the heating element assembly 100. Furthermore, the mounting bracket 6 has a connecting hole to allow the flow of the heat transfer medium on both sides of the mounting bracket 6. The mounting bracket 6 is welded to the outer tube 1 to ensure the stability and reliability of the mounting bracket 6 within the outer tube 1.

[0055] In one embodiment, water is used as the heat transfer medium to reduce the cost of the heating element assembly 100. In other embodiments, the heat transfer medium may also be a phase change medium, oil, or other heat-conducting medium.

[0056] In one embodiment, the ratio of the volume of the heat-conducting medium to the volume of the heat-conducting space 16 is greater than 0.85 and less than 9, so that the heat-conducting medium can wrap around the heating tube 31, while a space for the expansion of the heat-conducting medium is reserved between the heat-conducting medium and the inner wall of the outer tube 1, thereby improving the safety of the heating tube assembly 100.

[0057] like Figure 2 and Figure 4 As shown, in one embodiment, the outer tube 1 includes a tube body 11 and a first end plate 12 connected to the first end of the tube body 11. An end seal 2 is installed at the second end of the tube body 11. The tube body 11 abuts against the inner wall of the water tank 300. A terminal 32 is connected to the first end plate 12. The first end of the outer tube 1 is welded to the inner wall of the water tank 300, or the first end plate 12 is detachably connected to the water tank 300. That is, the electric heating tube assembly 100 itself can form a closed heat-conducting space 16, thereby allowing the electric heating tube assembly 100 to be assembled as a whole and then installed into the water tank 300, which is conducive to realizing the modular setting of the electric heating tube assembly 100 and improving the assembly convenience of the electric heating tube assembly 100.

[0058] To improve the assembly and disassembly performance of the heating element assembly 100 on the water tank 300, in one embodiment, the first end plate 12 is recessed in the direction toward the heat conduction space 16 to form a threaded cylindrical portion 15. The threaded cylindrical portion 15 has an internal threaded hole 18 located outside the heat conduction space 16. The water tank 300 is provided with a mounting through hole 3012, which is directly connected to the internal threaded hole 18. The water tank 300 and the outer tube 1 are connected by threaded fasteners passing through the internal threaded hole 18 and the mounting through hole 3012. By providing a threaded cylinder portion 15 with an internal threaded hole 18, threaded fasteners can directly pass through the first end plate 12 and be screwed into the threaded cylinder portion 15, thereby effectively simplifying the connection structure between the electric heating tube assembly 100 and the water tank 300 and improving the structural compactness. At the same time, by providing the threaded cylinder portion 15, the depth of the internal threaded hole 18 can be increased while keeping the maximum thickness of the first end plate 12 unchanged, thereby ensuring the connection stability and reliability of the outer tube 1 on the water tank 300, and thus ensuring the assembly stability of the electric heating tube assembly 100 on the water tank 300.

[0059] Furthermore, two threaded cylindrical portions 15 are spaced apart, and the mounting through holes 3012 and threaded fasteners are respectively provided in a one-to-one correspondence with the threaded cylindrical portions 15, so as to further improve the installation stability of the heating tube assembly 100. In one embodiment, the two threaded cylindrical portions 15 are arranged vertically spaced apart and located between the two terminals in the second direction, so as to ensure the installation space of the threaded fasteners while avoiding structural interference, and at the same time, avoid the outer tube 1 being too large, thereby improving the structural compactness.

[0060] like Figure 2 and Figure 6 As shown, to improve the safety of the water heater, in one embodiment, the heating element assembly 100 further includes an insulating component 4. The insulating component 4 includes an insulating plate portion 41 and two sheath portions 43 protruding from the insulating plate portion 41. The insulating plate portion 41 is sandwiched between the first end plate 12 and the inner wall of the water tank 300. The sheath portions 43 extend out of the water tank 300, and two wiring terminals 32 are respectively inserted into the two sheath portions 43. Specifically, the sheath portions 43 pass through the first end cap 301. By providing the insulating component 4, the creepage distance between the heating element 31 and the first end cap 301 can be increased, reducing the probability of leakage and improving the safety and reliability of the water heater.

[0061] Specifically, the insulating plate portion 41 is provided with a clearance hole, and the internal threaded hole 18, the clearance hole and the mounting through hole 3012 are directly connected in the first direction. The fastening threaded hole passes through the mounting through hole 3012, the clearance hole and the internal threaded hole 18 in sequence from the outside of the first end plate 12.

[0062] In one embodiment, the first end plate 12 includes an end plate portion 121, a threaded cylinder portion 15 protruding from the end plate portion 121 on the side facing the heat conduction space 16, and a boss portion 122 protruding from the side of the end plate portion 121 away from the heat conduction space 16. The number and position of the boss portions 122 correspond to those of the threaded cylinder portions 15. An internal threaded hole 18 passes through the boss portion 122. An insulating plate portion 41 abuts against the boss portion 122 and is spaced apart from the end plate portion 121. By providing the boss portion 122, the length of the internal threaded hole 18 can be increased while keeping the length of the threaded cylinder portion 15 unchanged, thereby increasing the mating length between the threaded fastener and the heating element assembly 100 and improving the installation stability of the heating element assembly 100 in the water tank 300.

[0063] To improve the ease of installation of the insulating member 4, in one embodiment, the edge of the insulating plate portion 41 protrudes towards the heat-conducting space 16 and is provided with a raised ring portion 42. The end of the raised ring portion 42 away from the insulating plate portion 41 abuts against the end plate portion 121. By providing the raised ring portion 42, the insulating member 4 can be pressed tightly against the end plate portion 121, thereby ensuring the reliability of the relative position of the insulating member 4 and the outer tube 1 and preventing the insulating plate portion 41 from deforming under the pressure of the first end cover 301.

[0064] In one embodiment, the insulating plate portion 41 has a positioning ring portion 44 protruding from the side facing the end plate portion 121, and the boss portion 122 is inserted into the positioning ring portion 44. Thus, the mounting and positioning of the insulating component 4 on the outer tube 1 can be achieved through the insertion and engagement of the boss portion 122 and the positioning ring portion 44, ensuring the stability and reliability of the installation of the insulating component 4.

[0065] To further improve the performance of the electric heating tube assembly 100, in one embodiment, the outer tube 1 has a retaining ring portion 17 that protrudes axially relative to the first end plate 12. The retaining ring portion 17 is arranged around the outside of the first end plate 12. The electric heating tube assembly 100 also includes a sealing ring 5, which is inserted into the retaining ring portion 17, and all wiring terminals 32 are located within the sealing ring 5. The sides of the retaining ring portion 17 and the sealing ring 5 away from the first end plate 12 abut against the first end cap 301. By providing the sealing ring 5, the electric heating tube assembly 100 and the first end cap 301 can be sealed, preventing the heat exchange medium in the water tank 300 from flowing out through the wiring hole on the first end plate 12, thus improving the safety of the water heater. At the same time, by providing the retaining ring portion 17, the sealing ring 5 can be better positioned on the outer tube 1, reducing assembly difficulty and improving assembly efficiency. In other embodiments, only the sealing ring 5 may be provided, without the retaining ring portion 17.

[0066] In one embodiment, a sealing groove is formed between the insulating member 4 and the retaining ring portion 17, and the sealing ring 5 is interference-fitted into the sealing groove. This arrangement ensures that after the heating element assembly 100 is assembled, the sealing ring 5 is sandwiched between the retaining ring portion 17 and the insulating member 4 without moving, improving the ease and stability of setting the sealing ring 5. Specifically, the sealing ring 5 is sandwiched between the retaining ring portion 17 and the positioning ring portion 44.

[0067] like Figure 3 As shown, in one embodiment, the second end of the outer tube 1 has a second end plate 13. The second end plate 13 has a mounting cylinder 14 protruding from it in a direction away from the heat-conducting space 16. The filling port extends from the mounting cylinder 14 and penetrates the second end plate 13. The end seal 2 is detachably connected to the mounting cylinder 14. By providing the mounting cylinder 14, the ease of installation of the end seal 2 on the outer tube 1 can be improved.

[0068] To improve the ease of connection between the end seal 2 and the mounting cylinder 14, the end seal 2 includes an end sleeve 21 and a sealing plug 22. One end of the end sleeve 21 is open and the other end is closed. The end sleeve 21 is threaded onto the outside of the mounting cylinder 14. The sealing plug 22 is installed inside the end sleeve 21 and seals the opening of the mounting cylinder 14. By setting the end sleeve 21, the installation positioning between the end sleeve 21 and the mounting cylinder 14 can be achieved through the interlocking connection, improving assembly efficiency. Simultaneously, the threaded connection of the end sleeve 21 to the outside of the mounting cylinder 14 effectively enhances the connection stability and reliability of the end sleeve 21 on the mounting cylinder 14. Furthermore, the sealing plug 22 facilitates the sealing of the opening of the mounting cylinder 14 by the end seal 2.

[0069] In other embodiments, the end cap 21 may also be interference-fitted into the mounting cylinder 14 and fastened by a fastening structure.

[0070] In one embodiment, the sealing plug 22 includes a plug body 221 and a sealing protrusion 222 protruding from the side wall of the plug body 221. The plug body 221 is interference-fitted into the mounting cylinder 14, and the sealing protrusion 222 is sandwiched between the end of the mounting cylinder 14 and the end sleeve 21. This structure of the sealing plug 22 can achieve a seal at the connection between the end sleeve 21 and the mounting cylinder 14 in both axial and radial directions, ensuring a sealing effect. At the same time, even when the installation position of the end sleeve 21 on the mounting cylinder 14 is slightly adjusted, the sealing plug 22 can still ensure the sealing effect of the sealing plug 22 on the open part of the mounting cylinder 14, preventing leakage of the heat transfer medium and improving the safety of the electric heating tube assembly 100.

[0071] In one embodiment, the end cap 21 includes a main part that is open at one end and closed at the other. A screwing part is connected to the outer side of the closed end of the main part, and the outer wall of the screwing part is provided with an operating surface. The inner wall of the main part is provided with internal threads. The screwing part is used to perform screwing operations in conjunction with a screwing mechanism such as a wrench.

[0072] In one embodiment, the tube body 11 is separately disposed from at least one of the second end plate 13 or the first end plate 12, so that when assembling the heating tube assembly 100, the inner heating tube can be installed into the outer tube 1 through the end socket of the tube body 11. Furthermore, both the second end plate 13 and the first end plate 12 are separately machined and welded to the tube body 11, thereby improving assembly convenience while reducing the probability of heat transfer medium leakage at the connection point and improving the safety of the heating tube assembly 100 in use.

[0073] Example 2

[0074] This embodiment provides a water heater, and the basic structure of the water heater provided in this embodiment is the same as that in the above embodiments, with only some settings being different from those in the above embodiments. This embodiment will not repeat the contents that are the same as those in the above embodiments.

[0075] like Figure 7 and Figure 8 As shown, in this embodiment, the first end of the outer tube 1 is open and welded to the inner wall of the water tank 300. That is, in this embodiment, the inner cavity of the outer tube 1 and the inner wall of the water tank 300 form a heat-conducting space 16. This arrangement simplifies the structure of the outer tube 1 and the heating element assembly 100, reduces processing costs, and the welding between the outer tube 1 and the inner wall of the water tank 300 ensures the airtightness of the heat-conducting space 16. Specifically, the outer tube 1 is welded to the first end cap 301.

[0076] To improve the assembly reliability of the outer pipe 1 and the water tank 300, in one embodiment, a positioning protrusion 3011 is provided inwardly on the first end cover 301 of the water tank 300. The positioning protrusion 3011 has a disc-shaped structure. The positioning protrusion 3011 is inserted into the first end of the outer pipe 1 and is connected to the outer pipe 1. The positioning protrusion 3011 is welded to the outer pipe 1, and the wiring terminal 32 passes through the positioning protrusion 3011.

[0077] Thus, by cooperating with the positioning protrusion 3011 and the outer tube 1, the outer tube 1 is positioned on the water tank 300, improving the installation stability and reliability of the electric heating tube assembly 100 and increasing the assembly efficiency of the water heater; at the same time, by welding the positioning protrusion 3011 to the outer tube 1, the welding convenience and structural stability after connection can be improved.

[0078] The first end cap 301 has two mounting holes, and the two ends of the heating element 31 are interference-fitted into the mounting holes. The edges of the mounting holes are folded outward to form perforated flanges 3013, so as to increase the contact area between the heating element 31 and the first end cap 301, thereby increasing the stability and reliability of the heating element 3.

[0079] Other structures of the water heater can be set with reference to the above embodiments or existing technologies, and will not be limited or described in detail in this embodiment.

[0080] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0081] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A water heater, characterized in that, include: A water tank (300) is provided with a heat exchange medium. An outer tube (1) is located inside the water tank (300) and in contact with the heat exchange medium. The first end of the outer tube (1) is connected to the inner wall of the water tank (300), and the second end of the outer tube (1) is provided with a filling port. End seal (2) is detached from the second end of the outer tube (1) and the filling port is sealed so that a closed heat-conducting space (16) is formed inside the outer tube (1). A heat-conducting medium is disposed in the heat-conducting space (16). The heating tube (3) includes an electric heating tube (31) and a terminal (32) connected to the end of the electric heating tube (31). The electric heating tube (31) is used to heat the heat-conducting medium. The terminal (32) is located at the first end of the outer tube (1) and extends out of the water tank (300).

2. The water heater according to claim 1, characterized in that, The outer tube (1) includes a tube body (11) and a first end plate (12) connected to the first end of the tube body (11). The end seal (2) is installed at the second end of the tube body (11). The tube body (11) abuts against the inner wall of the water tank (300). The terminal (32) is connected to the first end plate (12). The first end of the outer tube (1) is welded to the inner wall of the water tank (300) or the first end plate (12) is detachably connected to the water tank (300).

3. The water heater according to claim 2, characterized in that, The first end plate (12) is recessed in the direction toward the heat conduction space (16) to form a threaded cylindrical part (15). The threaded cylindrical part (15) has an internal threaded hole (18) located outside the heat conduction space (16). The water tank (300) is provided with a mounting through hole (3012). The mounting through hole (3012) is directly connected to the internal threaded hole (18). The water tank (300) and the outer tube (1) are connected by threaded fasteners passing through the internal threaded hole (18) and the mounting through hole (3012).

4. The water heater according to claim 3, characterized in that, The water heater also includes an insulating component (4), which includes an insulating plate portion (41) and two sheath portions (43) protruding from the insulating plate portion (41). The insulating plate portion (41) is sandwiched between the first end plate (12) and the inner wall of the water tank (300). The sheath portions (43) extend out of the water tank (300), and the two wiring terminals (32) are respectively inserted into the two sheath portions (43).

5. The water heater according to claim 4, characterized in that, The first end plate (12) includes an end plate portion (121), the threaded cylinder portion (15) protrudes from the end plate portion (121) on the side facing the heat conduction space (16), and the end plate portion (121) on the side away from the heat conduction space (16) has a boss portion (122). The number and position of the boss portions (122) correspond to the threaded cylinder portion (15). The internal threaded hole (18) passes through the boss portion (122), and the insulating plate portion (41) is sandwiched between the boss portion (122) and the inner wall of the water tank (300).

6. The water heater according to claim 5, characterized in that, The edge of the insulating plate portion (41) is provided with a protruding ring portion (42) in the direction toward the first end plate (12), and the protruding ring portion (42) abuts against the end plate portion (121); And / or, the insulating plate portion (41) is provided with a positioning ring portion (44) protruding in the direction toward the heat conduction space (16), and the boss portion (122) is inserted into the positioning ring portion (44).

7. The water heater according to claim 4, characterized in that, The outer tube (1) has a retaining ring (17) surrounding the outside of the first end plate (12). The water heater includes a sealing ring (5), which is sandwiched between the first end plate (12) and the inner wall of the water tank (300), and the sealing ring (5) is sleeved between the retaining ring (17) and the insulating member (4).

8. The water heater according to claim 1, characterized in that, The first end of the outer pipe (1) is open and welded to the inner wall of the water tank (300).

9. The water heater according to claim 8, characterized in that, The inner wall of the water tank (300) is provided with a positioning protrusion (3011) protruding inward. The positioning protrusion (3011) is inserted into the first end of the outer tube (1) and welded to the outer tube (1).

10. The water heater according to any one of claims 1-9, characterized in that, The second end of the outer tube (1) has a second end plate (13), and the second end plate (13) is provided with an installation cylinder (14) protruding in a direction away from the heat conduction space (16). The filling port extends from the installation cylinder (14) to penetrate the second end plate (13). The end seal (2) is detachably connected to the installation cylinder (14).

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