Heating assembly and water heater

Abstract

Disclosed are a heating assembly (1) and a water heater. The heating assembly (1) includes a sleeve (11), a heating tube (12) and a heat conductive member (13). One end of the sleeve (11) is closed and the other end is open. The heating tube (12) is inserted into the sleeve (11). The heating tube (12) includes a tube body (121) and a heating element (122) provided in the tube body (121). The tube body (121) has a first end and a second end opposite to the first end in the extending direction of the sleeve (11). The first end is close to the closed end of the sleeve (11), and the second end is close to the open end of the sleeve (11). The heating element (122) has two terminals extending out of the second end. The heat conductive member (13) is provided between the tube body (121) and the sleeve (11), and the heat conductivity coefficient of the heat conductive member (13) is higher than that of air.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of water heaters, and in particular to a heating assembly and a water heater.BACKGROUND

[0002] Heating assemblies are used in electric water heaters. Heating assemblies such as dry heaters generally have a heating tube and a sleeve. The sleeve is provided inside a tank, and the heating tube is provided in the sleeve. When the heating tube is working, the heating tube is energized to convert electrical energy into thermal energy, and then the heat is exchanged with the water in the inner tank through the sleeve, thereby heating the water in the inner tank.

[0003] In the related art, the heat from the heating tube cannot be transmitted to the water in the inner tank through the sleeve in time, and the heat is accumulated between the heating tube and the sleeve, causing the heating tube to be in a high temperature environment for a long time, and affecting the service life of the heating assembly.SUMMARY

[0004] The main purpose of the present invention is to propose a heating assembly, which is designed to improve the heat transfer efficiency of the heating assembly, improve the high-temperature environment of the heating tube, and extend the service life.

[0005] In order to achieve the above purpose, the heating assembly proposed by the present invention includes a sleeve with one end closed and the other end open, a heating tube and a heat conductive member.

[0006] Optionally, the heating tube is inserted into the sleeve and including a tube body and a heating element provided in the tube body.

[0007] Optionally, the heating tube is provided with a first end and a second end opposite to the first end in an extension direction of the sleeve.

[0008] Optionally, the first end is close to a closed end of the sleeve, the second end is close to an open end of the sleeve, and the heating element is provided with two terminals extending out of the second end.

[0009] Optionally, the heat conductive member is provided between the tube body and the sleeve, and the heat conductive member has a heat conductivity coefficient higher than a heat conductivity coefficient of air.

[0010] Optionally, at least one of an outer wall of the tube body and an inner wall of the sleeve is in contact with the heat conductive member.

[0011] Optionally, the heat conductive member is a heat conductive film wrapped around the outer wall of the tube body.

[0012] Optionally, the heat conductive member is a heat conductive sheet sandwiched between the tube body and the sleeve.

[0013] Optionally, the heat conductive member is a rib protruding toward the sleeve at the outer wall of the tube body.

[0014] Optionally, the heat conductive member is a rib protruding toward the tube body at the inner wall of the sleeve.

[0015] Optionally, the heat conductive member is a magnesia powder structure or a thermally conductive silicone grease structure filled between the sleeve and the tube body.

[0016] Optionally, the heat conductive member is an insulation member.

[0017] Optionally, the sleeve includes a metal tube body and an insulation coating provided at an outer wall of the metal tube body, and the insulation coating is ceramic layer.

[0018] Optionally, the tube body is filled with an insulation and heat conductive material, and the insulation and heat conductive material is configured to isolate the heating element from a tube wall of the tube body.

[0019] Optionally, the heating element includes two heating sections arranged side by side.

[0020] Optionally, a first lead-out rod and a second lead-out rod are provided at both ends of each heating section, two first lead-out rods are electrically connected at the first end, and two second lead-out rods is configured to extend from the second end to form two terminals.

[0021] Optionally, the heating assembly further includes a flange installation base, the flange installation base is connected to the open end of the sleeve and is open corresponding to a position of the sleeve for the heating tube to extend.

[0022] In order to achieve the above purpose, the present invention also provides a water heater, including an inner tank and the heating assembly as described above, and a sleeve of the heating assembly is configured to extend into the inner tank.

[0023] In the heating assembly of the technical solution of the present invention, the heating tube is inserted into the sleeve. The heating tube includes a tube body and a heating element provided in the tube body. The tube body has a first end close to the closed end of the sleeve and a second end close to the open end of the sleeve. By extending two terminals of the heating element out of the second end for electrical connection with the external power supply, to realize the normal heating function of the heating tube in the sleeve. In this embodiment, the heat conductive member with a heat conductivity coefficient higher than that of air is provided between the tube body and the sleeve. The heat conductive member can quickly conduct the heat from the heating tube to the sleeve, thereby further accelerating the heat transfer efficiency of the heating assembly, improving the high-temperature environment of the heating tube and extending the service life of the heating tube. At the same time, it can reduce the surface temperature of the heating assembly, reduce the generation of scale, and improve the quality of bathing water.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the related art, the accompanying drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on structures shown in these drawings without any creative effort. FIG. 1 is a schematic structural view of a heating tube in a heating assembly according to an embodiment of the present invention. FIG. 2 is a partial enlarged view at portion A in FIG. 1. FIG. 3 is a partial enlarged view at portion B in FIG. 1. FIG. 4 is a schematic structural view of match between a sleeve and a flange installation base in the heating assembly according to an embodiment of the present invention. FIG. 5 is a schematic structural view of a case in which a heat conductive member is a heat conductive sheet in the heating assembly according to an embodiment of the present invention. FIG. 6 is a partial enlarged view at portion C in FIG. 5. FIG. 7 is a cross-sectional view of the embodiment of FIG. 5. FIG. 8 is a schematic structural view of a case in which a heat conductive member is a heat conductive film in the heating assembly according to an embodiment of the present invention. FIG. 9 is a partial enlarged view at portion D in FIG. 8. FIG. 10 is a schematic structural view of a case in which a heat conductive member is a rib that the sleeve faces the heating tube in the heating assembly according to an embodiment of the present invention. FIG. 11 is a partial enlarged view at portion F in FIG. 10. FIG. 12 is a schematic structural view of a case in which a heat conductive member is a rib that the heating tube faces the sleeve in the heating assembly according to an embodiment of the present invention. FIG. 13 is a partial enlarged view at portion G in FIG. 12. FIG. 14 is a cross-sectional view of the embodiment of FIG. 12. FIG. 15 is a schematic structural view of a case in which a heat conductive member is heat conductive material filled in the heating assembly according to an embodiment of the present invention. FIG. 16 is a partial enlarged view at portion E in FIG. 15. FIG. 17 is a schematic structural view of a water heater according to an embodiment of the present invention. Description of reference signs:

[0025] reference signnamereference signname1heating assembly123insulation heat conductor11sleeve13heat conductive member12heating tube14flange installation base121tube body2inner tank122heating element201aperture1221heating section31water inlet pipe1222first lead-out rod32water outlet pipe1223second lead-out rod

[0026] The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in 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 some rather than all of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship, movement conditions, etc. between the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] At the same time, the meaning of "and / or" in the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that A and B satisfy at the same time.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second",, etc. are only for descriptive purposes and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions in the various embodiments can be combined with each other, but it must be based on what a person of ordinary skill in the art can implement. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist, nor is it within the scope of the present invention.

[0031] Heating assemblies are used as heating elements in electric water heaters. Heating assemblies such as dry heaters generally have a heating tube and a sleeve. The sleeve is provided inside the inner tank, and the heating tube is provided in the sleeve. When the heating tube is working, the heating tube is energized to convert electrical energy into thermal energy, and then the heat is exchanged with the water in the inner tank through the sleeve, thereby heating the water in the inner tank.

[0032] However, in the related art, the gap between the heating tube and the sleeve is large, so the heat generated by the heating tube cannot be transmitted to the water in the inner tank through the sleeve in time. The heat is accumulated between the heating tube and the sleeve, causing a temperature of an inner wall of the sleeve to be too high, which in turn causes the heating tube to be in a high temperature environment for a long time, affecting the service life of the heating assembly. At the same time, the accumulation of heat inside the sleeve will also cause the outer wall temperature of the sleeve itself to be too high, and high temperature are more conducive to the formation of scale. The scale is generated, shed, regenerated and shed again at the surface of the heating assembly and deposited in the inner tank of the water heater to breed bacteria, affecting the quality of bathing water.

[0033] Based on this, the present invention proposes a heating assembly 1, which aims to improve the heat transfer efficiency of the heating assembly 1, improve the high-temperature environment of the heating tube, reduce the tube surface temperature of the heating assembly, reduce the generation of scale, and improve the quality of bathing water. The structure of the heating assembly 1 will be described below in the form of embodiments.

[0034] In the embodiment of the present invention, as shown in FIG. 1, FIG. 4 and FIG. 5, the heating assembly 1 includes a sleeve 11, a heating tube 12 and a heat conductive member 13.

[0035] One end of the sleeve 11 is closed and the other end of the sleeve 11 is open. The heating tube 12 is inserted into the sleeve 11. The heating tube 12 includes a tube body 121 and a heating element 122 provided in the tube body 121. The tube body 121 has a first end and a second end opposite to the first end in the extension direction of the sleeve 11. The first end is close to the closed end of the sleeve 11, and the second end is close to the open end of the sleeve 11. The heating element 122 has two terminals extending out of the second end. The heat conductive member 13 is provided between the tube body 121 and the sleeve 11, and the heat conductivity coefficient of the heat conductive member 13 is higher than the heat conductivity coefficient of air.

[0036] In this embodiment, one end of the sleeve 11 is closed and the other end of the sleeve 11 is open. The closed end is used to extend into the inner tank 2 of the water heater, and the open end is used to insert the heating tube 12 into the inside of the sleeve 11. The sleeve11 can protect the heating tube 12, prevent the heating pipe 12 from directly contacting water in the inner tank 2 of the water heater, and improve water safety. The heating tube 12 includes a tube body 121 and a heating element 122. The tube body 121 extends along the extension direction of the sleeve 11. The heating element 122 has two terminals, and the two terminals extend out of the open end of the sleeve 11 from the second end for electrically connection with the power supply component outside the sleeve 11 to ensure the normal heating function of the heating tube 12. It can be understood that since the heating tube 12 is inserted into the sleeve 11, in actual applications (for example, when the heating tube fails and needs to be repaired and replaced), it is necessary to remove or install the heating tube 12 from the sleeve 11. There is a gap between the heating tube 12 and the sleeve 11 to facilitate disassembly and assembly. The heat of the heating tube 12 needs to be conducted to the sleeve 11 through the air in the gap. However, the heat conductivity coefficient of the air is not very high and the heat transfer efficiency is poor. Based on this, in this embodiment, the heat conductive member 13 is provided between the tube body 121 and the sleeve 11, and the heat conductivity coefficient of the heat conductive member 13 is higher than that of air, thereby speeding up the efficiency of heat transfer from the heating tube 12 to the sleeve 11, and improving the heat transfer efficiency of heating assembly 1.

[0037] In actual applications, the specific structure and material of the heat conductive member 13 can be determined according to actual conditions, for example, it can be a sheet structure, a strip structure, a powder structure, a film structure or other types of structures. The heat conductive member 13 can be made of metal materials or non-metal materials with high heat transfer efficiency. The heat conductive member 13 is provided between the tube body 121 and the sleeve 11. It can be understood that the heat conductive member 13 only contacts the tube body 121, or only contacts the sleeve 11, or contacts the tube body 121 and the sleeve 11, or contact neither the tube body 121 nor the sleeve 11. As long as the heat conductive member 13 is provided between the tube body 121 and the sleeve 11, the heat transfer efficiency between the heating tube 12 and the sleeve 11 can be accelerated.

[0038] It can be understood that the insulation between the tube body 121 and the heating element 122 prevents leakage problems caused by electrical conduction between the heating element 122 and the tube body 121. At the same time, the tube body 121 can quickly conduct the heat inside to the outside. In an embodiment, the tube body 121 can be a metal tube or a non-metal tube with good heat conduction. The tube body 121 itself can be made of insulating material or non-insulating material. When the tube body 121 is made of non-insulating material, the tube body 121 can be insulated from the heating element 122 by filling the inside of the tube body 121 with insulating material. In an embodiment, the cross-sectional shape of the tube body 121 can be circular, semicircular, square, triangular or other special shapes. In practical applications, the tube body 121 can be configured as a circular tube for easy molding.

[0039] In practical applications, the specific structure of the heating element 122 can be determined according to the actual situation. For example, the heating element 122 can be a resistance wire structure with high heating efficiency alone, or can be a structure such as a resistance wire, a wire and a guide rod. The heating element 122 has two terminals, which are respectively a positive terminal and a negative terminal.

[0040] It should be noted that in this embodiment, two terminals of the heating element 122 of the heating tube 12 extend out of the same end of the tube body 121. Compared with the U-shaped heating tube 12 in the related art that is integrally bent, the heating tube 12 of this embodiment does not need to be folded in half by hydraulic operation, and the tube body 121 can be processed with higher precision. The outer diameter of the heating tube processed by a multi-roller tube shrinking machine can be controlled within the range of ±0.1mm, which can further reduce the gap between the heating tube 12 and the inner wall of the sleeve 11, and further accelerate the heat transfer from the heating tube 12 to the sleeve 11.

[0041] In the heating assembly 1 of the technical solution of the present invention, the heating tube 12 is inserted into the sleeve 11. The heating tube 12 includes a tube body 121 and a heating element 122 provided in the tube body 121. The tube body 121 has a first end close to the closed end of the sleeve 11 and a second end close to the open end of the sleeve 11. The two terminals of the heating element 122 is extended out of the second end for electrical connection with the external power supply, thereby realizing the normal heating function of the heating tube 12 in the sleeve 11. In this embodiment, by providing the heat conductive member 13 with a heat conductivity coefficient higher than that of air between the tube body 121 and the sleeve 11, the heat conductive member 13 can quickly conduct the heat from the heating tube 12 to the sleeve 11, thereby further accelerating the heat transfer efficiency of the heating assembly 1, improving the high-temperature environment of the heating tube and extending the service life of the heating tube 12. At the same time, it is possible to reduce the tube surface temperature of the heating assembly 1, reduce the generation of scale, and improve the quality of bathing water.

[0042] In an embodiment of the present invention, as shown in FIG. 5 to FIG. 7, at least one of the outer wall of the tube body 121 and the inner wall of the sleeve 11 is in contact with the heat conductive member 13.

[0043] It can be understood that the heat conductive member 13 may only contact the outer wall of the tube body 121; or the heat conductive member 13 may only contact the inner wall of the sleeve 11; or the heat conductive member 13 may contact both the outer wall of the tube body 121 and the inner wall of the sleeve 11. The specific arrangement method of the heat conductive member 13 can be determined according to the actual situation and is not limited here.

[0044] In this embodiment, by contacting the heat conductive member 13 with at least one of the outer wall of the tube body 121 and the inner wall of the sleeve 11, compared with the case in which the heat conductive member 13 contacts neither the outer wall of the tube body 121 nor the inner wall of the sleeve 11, the heat transfer efficiency can be further improved, and processing and manufacturing are facilitated.

[0045] In practical applications, the specific structure of the heat conductive member 13 can be determined according to actual conditions.

[0046] In an embodiment of the present invention, as shown in FIG. 8 and FIG. 9, the heat conductive member 13 is a heat conductive film wrapped around the outer wall of the tube body 121. In this embodiment, the heat conductive film is wrapped around the tube body 121. Since the heat conductive film has a certain degree of flexibility, when the tube body 121 is inserted into the sleeve 11, the heat conductive film can deform slightly when compressed, to cushion the mechanical collision between the tube body 121 of the heating tube 12 and the sleeve 11 and avoid damage.

[0047] In an embodiment, the heat conductive film can be made of film-like materials such as polyimide, polyamide, polytetrafluoroethylene, polyvinyl chloride, polypropylene, polyester, polyurethane, etc., which can enhance heat conductivity and increase the life of the heating tube 12. Since the material itself has good insulation properties, the heating assembly can also be upgraded to a reinforced insulation device to further improve its safety performance.

[0048] In an embodiment of the present invention, as shown in FIG. 5 to FIG. 7, the heat conductive member 13 is a heat conductive sheet sandwiched between the tube body 121 and the sleeve 11. In this embodiment, the heat conductive sheet can be a metal sheet or a non-metal sheet, which can quickly transfer the heat of the tube body 121 to the sleeve 11 and extend the life of the heating tube 12. In the embodiment, the shape of the heat conductive sheet can be an annular sheet, an arc sheet, a rectangular sheet, or other shaped sheet structures.

[0049] In an embodiment of the present invention, as shown in FIG. 12 to FIG. 14, the heat conductive member 13 is a rib protruding toward the sleeve 11 at the outer wall of the tube body 121. In this embodiment, the heat conductive member 13 is a rib provided at the outer wall of the tube body 121 to reduce the heat conduction distance between the inner wall of the sleeve 11 and the heating tube 12, thereby enhancing heat conduction and extending the life of the heating tube 12. In an embodiment, the rib can be integrally formed with the tube body 121 or the rib can be welded and fixed with the tube body 121. The rib can extend to contact the inner wall of the sleeve 11 or not.

[0050] In an embodiment of the present invention, as shown in FIG. 10 and FIG. 11, the heat conductive member 13 is a rib protruding toward the tube body 121 at the inner wall of the sleeve 11. In this embodiment, the heat conductive member 13 is a rib provided at the inner wall of the sleeve 11 to reduce the heat conduction distance between the inner wall of the sleeve 11 and the heating tube 12, thereby enhancing the heat conduction and extending the life of the heating tube 12. In an embodiment, the rib can be pressed inwardly from the body of the sleeve 11. The ribs can extend to contact the inner wall of the tube body 121 or not.

[0051] In an embodiment of the present invention, as shown in FIG. 15 and FIG. 16, the heat conductive member 13 is a magnesium oxide powder structure or a heat conductive silicone grease structure filled between the sleeve 11 and the tube body 121. In this embodiment, the thermal conductive member 13 is a heat conductive material directly filled between the sleeve 11 and the tube body 121, such as magnesium oxide powder or heat conductive silicone grease, which can enhance heat conductivity and increase the life of the heating tube 12. Since the material itself has good insulation performance, the heating assembly 1 can also be upgraded to a reinforced insulation device to further improve its safety performance. In practical applications, in this embodiment, the open end of the sleeve 11 needs to be sealed to prevent the heat conductive member 13 from leaking.

[0052] It should be noted that in actual application, the specific structure of the heat conductive member 13 can not be limited to the above-mentioned embodiments, and other embodiments can also be adopted, which are not limited here.

[0053] In an embodiment of the present invention, as shown in FIG. 8 and FIG. 9, the heat conductive member 13 is an insulation member. Such an arrangement can not only enhance the heat conduction and extend the service life of the heating tube 12, but also enhance the insulation performance between the heating tube 12 and the sleeve 11, further improving the safety performance of the heating assembly 1.

[0054] In an embodiment of the present invention, the sleeve 11 includes a metal tube body and an insulation coating provided at the outer wall of the metal tube body, and the insulation coating is a ceramic layer.

[0055] It can be understood that the heat generated by the heating tube 12 is transferred to the inner wall of the sleeve 11 through the heat conductive member 13, and then transferred to water in the inner tank through the metal tube body and the outer insulation coating of the sleeve 11. However, the insulation coating in the related art is made of enamel, but due to the influence of the enamel treatment process, the thickness of the enamel layer is 200 µm ~ 500 µm, which is relatively thick. At the same time, enamel is a poor conductor of heat. The heat of the sleeve 11 itself cannot be transferred to the water quickly, resulting in the temperature of the outer wall of the sleeve 11 to be too high, and causing the generation of scale. The scale is generated, falls off, regenerated, and falls off again at the surface of the sleeve 11, and deposited in the inner tank and breeds bacteria, affecting the quality of the user's bathing water. Based on this, in this embodiment, the insulation coating is configured as a ceramic layer. The heat conductivity of the ceramic layer is higher than that of enamel. At the same time, the thickness of the ceramic layer can be 10 µm - 50 µm, which reduces the thickness of the insulation coating. Thereby, the heat transfer path is reduced, the heat transfer efficiency of the heating assembly 1 is further improved, and the generation of scale is avoided.

[0056] In an embodiment of the present invention, as shown in FIG. 1 to FIG. 3, the tube body 121 is filled with an insulation heat conductor 123, and the insulation heat conductor 123 isolates the heating element 122 from the wall of the tube body 121.

[0057] In this embodiment, the insulation heat conductor 123 can conduct the heat of the heating element 122 to the wall of the tube body 121, which is beneficial to transmitting the heat of the heating element 122. Furthermore, the insulation heat conductor 123 can isolate the heating element 122 and the inner wall of the tube body 121, to prevent the heating element 122 from contacting the inner wall of the tube body 121 and causing the risk of electric leakage. In an embodiment, the insulation heat conductor 123 is magnesium oxide powder. The magnesium oxide powder has good insulation properties and heat conductivity, can effectively isolate the current inside the heating tube, and transfer the heat of the resistance wire to the tube body 121 in a timely manner for insulation and heat conduction. Powdered magnesium oxide powder can form a stable support structure in the heating tube, so that the heating element 122 is well fixed and supported.

[0058] With this arrangement, the insulation heat conductor 123 is provided between the heating element 122 and the tube body 121, the heat conductive member 13 is provided between the tube body 121 and the inner wall of the sleeve 11, and the ceramic layer is provided at the outer wall of the sleeve 11. As a result, a three-layer insulation and heat conductive structure is formed in the heating assembly 1. This insulation and heat conductive structure can not only enhance the insulation performance of the heating assembly 1 to ensure safety, but also improve the heat transfer efficiency and extend the service life of the heating tube 12.

[0059] In an embodiment of the present invention, as shown in FIG. 1 to FIG. 3, the heating element 122 includes two heating sections 1221 arranged side by side. Each heating section 1221 is provided with a first lead-out rod 1222 and a second lead-out rod 1223 at both ends. Two first lead-out rods 1222 are electrically connected at the first end, and two second lead-out rods 1223 extend out from the second end to form two terminals.

[0060] It can be understood that the heating section 1221 is a structure with high heating efficiency, such as a resistance wire. The heating element 122 includes two heating sections 1221 arranged side by side. The electrical connection is realized through the two first lead-out rods 1222, which can avoid direct bending of the resistance wire, reduce damage to the resistance wire, and increase the life of the heating tube 12. The resistance wire is usually made of metal or alloy materials and has a certain degree of elasticity. If the resistance wire is directly bent, the resistance wire will deform. The elasticity of the resistance wire will make it try to return to its original shape, thereby making it possible for both ends of the resistance wire to contact the inner wall of the tube body 121. By arranging two resistance wires side by side, it is beneficial to maintaining the relative position between the two resistance wires, preventing the two resistance wires from contacting each other, and avoiding contact between the resistance wire and the inner wall of the tube body 121.

[0061] In practical applications, the first lead-out rod 1222 can be a conductive rod, a wire, a conductive sheet, or other conductive structure. The first lead-out rod 1222 and the heating section 1221 can be connected by welding, winding or other electrical connection methods. It can be understood that the first lead-out rod 1222 has a connection end, and the cross-sectional area of the first lead-out rod 1222 gradually decreases in a direction from the middle of the first lead-out rod 1222 to the connection end, so that the connection end forms a tapered shape, which is helpful for the spiral resistance wire to be sleeved at the connection end to increase the contact area between the first lead-out rod 1222 and the resistance wire, and to ensure the electrical connection between the first lead-out rod 1222 and the resistance wire.

[0062] The heating section 1221 is provided with a second lead-out rod 1223 at the second end, and two second lead-out rods 1223 extend from the second end of the tube body 121 to form two terminals for electrical connection with the external power supply. The connection structure between the second lead-out rod 1223 and the heating section 1221 can refer to the connection structure between the first lead-out rod 1222 and the heating section 1221, and will not be repeated here.

[0063] The inside of the tube body 121 is filled with magnesium oxide powder with good heat conductive property. The compactness of the magnesium oxide powder is related to the heat conductive property. In the related technology, in order to realize the folding and extrusion of the heating tube 1 as a whole, the magnesium oxide powder filled inside needs to be in a loose state, and the heat transfer efficiency of magnesium oxide powder with loose compactness is poor, which will cause the internal heating wire to overheat and burn out. In this embodiment, the two second lead-out rods 1223 are extended from the second end of the tube body 121, there is no need to bend the heating tube 12 as a whole, and there is no need to reduce the compactness of the magnesium oxide powder. This can ensure the compactness of the magnesium oxide powder, improve the heat transfer efficiency, and prevent the heating wire from burning out due to overheating, thereby reducing the occurrence of malfunctions.

[0064] In an embodiment of the present invention, as shown in FIG. 4 to FIG. 5, the heating assembly 1 also includes a flange installation base 14. The flange installation base 14 is connected to the open end of the sleeve 11 and is open corresponding to the position of the sleeve 11 for the heating tube 12 to extend.

[0065] In this embodiment, the sleeve 11 is installed at one end of the flange installation base 14. In an embodiment, the sleeve 11 and the flange installation base 14 can be formed as an integrated structure or can be formed through welding separate parts. When used in a water heater, the flange installation base 14 is fixed to the inner tank, the sleeve 11 is provided inside the inner tank 2, the heating tube 12 is inserted into the sleeve 11, and the terminal of the heating tube 12 is exposed to outside of the flange installation base 14 to facilitate connection with external power structures.

[0066] The present invention also proposes a water heater, as shown in FIG. 17, the water heater includes an inner tank 2 and a heating assembly 1. The specific structure of the heating assembly 1 refers to the above-mentioned embodiments. Since this water heater adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. The sleeve 11 of the heating assembly 1 extends into the inner tank 2.

[0067] In this embodiment, the inner tank 2 has a water inlet pipe 31 and a water outlet pipe 32. The water inlet pipe 31 is used to feed cold water into the inner tank 2, and the water outlet pipe 32 is used to discharge hot water from the inner tank 2. The inner tank 2 is provided with a aperture 201. Through fixing the flange installation base 14 to the aperture 201, the sleeve 11 is fixed inside the inner tank 2. The heating tube 12 is installed in the sleeve 11, and the water in the inner tank 2 is heated through the sleeve 11. When the heating tube 12 fails, there is no need to disassemble the flange installation base 14 or drain the water in the inner tank 2. The heating tube 12 can be directly removed. The disassembly and installation are very simple.

Claims

1. A heating assembly (1) comprising: a sleeve (11) with one end closed and the other end open; a heating tube (12) inserted into the sleeve (11) and comprising a tube body (121) and a heating element (122) provided in the tube body (121), wherein the heating tube (122) is provided with a first end and a second end opposite to the first end in an extension direction of the sleeve (11), the first end being adjacent to a closed end of the sleeve (11), the second end being adjacent to an open end of the sleeve (11), the heating element (122) being provided with two terminals extending out of the second end; and a heat conductive member (13) provided between the tube body (121) and the sleeve (11), wherein the heat conductive member (13) has a heat conductivity coefficient higher than that of air.

2. The heating assembly (1) according to claim 1, wherein at least one of an outer wall of the tube body (121) and an inner wall of the sleeve (11) is in contact with the heat conductive member (13).

3. The heating assembly (1) according to claim 2, wherein the heat conductive member (13) is a heat conductive film wrapped around the outer wall of the tube body (121).

4. The heating assembly (1) according to any one of claims 1 to 3, wherein the heat conductive member (13) is a heat conductive sheet sandwiched between the tube body (121) and the sleeve (11).

5. The heating assembly (1) according to any one of claims 2 to 4, wherein the heat conductive member (13) is a rib protruding toward the sleeve (11) at the outer wall of the tube body (121); and / or the heat conductive member (13) is a rib protruding toward the tube body (121) at the inner wall of the sleeve (11).

6. The heating assembly (1) according to any one of claims 1 to 5, wherein the heat conductive member (13) is a magnesia powder structure or a thermally conductive silicone grease structure filled between the sleeve (11) and the tube body (121).

7. The heating assembly (1) according to any one of claims 1 to 6, wherein the heat conductive member (13) is an insulation member.

8. The heating assembly (1) according to any one of claims 1 to 7, wherein the sleeve (11) comprises a metal tube body and an insulation coating provided at an outer wall of the metal tube body, and wherein the insulation coating is a ceramic layer.

9. The heating assembly (1) according to any one of claims 1 to 8, wherein the tube body (121) is filled with an insulation and heat conductive material, and wherein the insulation and heat conductive material is configured to isolate the heating element (122) from a tube wall of the tube body (121).

10. The heating assembly (1) according to any one of claims 1 to 9, wherein the heating element (122) comprises two heating sections (1221) arranged side by side, wherein a first lead-out rod (1222) and a second lead-out rod (1223) are provided at both ends of each heating section (1221), wherein two first lead-out rods (1222) are electrically connected at the first end, and wherein two second lead-out rods (1223) is configured to extend from the second end to form two terminals.

11. The heating assembly (1) according to any one of claims 1 to 10, further comprising a flange installation base (14), wherein the flange installation base (14) is connected to the open end of the sleeve (11) and is open corresponding to a position of the sleeve (11) for the heating tube (12) to extend.

12. A water heater comprising an inner tank (2) and the heating assembly (1) according to any one of claims 1 to 11, wherein a sleeve (11) of the heating assembly (1) is configured to extend into the inner tank (2).

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