Heating assembly and water heater

Abstract

The utility model discloses a heating assembly and a water heater, and relates to the technical field of water heaters. Wherein the heating assembly comprises a sleeve, a heating pipe and a heat conduction piece, one end of the sleeve is closed, and the other end of the sleeve is open; the heating pipe is inserted into the sleeve, the heating pipe comprises a pipe body and a heating piece arranged in the pipe body, the pipe body is provided with a first end and a second end which are opposite in the extending direction of the sleeve, the first end is close to the closed end of the sleeve, the second end is close to the open end of the sleeve, and the heating piece is provided with two wiring ends extending out of the second end; the heat conduction piece is arranged between the pipe body and the sleeve, and the heat conduction coefficient of the heat conduction piece is higher than that of air. According to the technical scheme, the heat transfer efficiency of the heating assembly can be improved, the high-temperature environment of the heating pipe can be improved, the service life of the heating pipe can be prolonged, meanwhile, the pipe surface temperature of the heating assembly can be reduced, incrustation is reduced, and bathing water quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a heating component and a water heater. Background Art

[0002] The heating assembly is used as a heating element in an electric water heater. A heating assembly such as a dry-type heater generally has a heating tube and a sleeve. The sleeve is arranged inside the inner tank, and the heating tube is placed in the sleeve. When the heating tube is working, the heating tube is energized to convert electrical energy into heat 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 of the heating tube cannot be transferred to the water in the inner tank through the sleeve in time, and the heat accumulates between the heating tube and the sleeve, causing the heating tube to be in a high temperature environment for a long time, affecting the service life of the heating component. Utility Model Content

[0004] The main purpose of the utility model is to provide a heating component, aiming to improve the heat transfer efficiency of the heating component, improve the high temperature environment of the heating tube, and extend the service life.

[0005] To achieve the above-mentioned purpose, the heating assembly proposed by the utility model includes:

[0006] a cannula, which is closed at one end and open at the other;

[0007] a heating tube, inserted in the sleeve, the heating tube comprising a tube body and a heating element arranged in the tube body, the tube body having a first end and a second end opposite to each other in the extending direction of the sleeve, the first end being close to the closed end of the sleeve, the second end being close to the open end of the sleeve, the heating element having two connection terminals extending out of the second end; and

[0008] The heat conducting member is arranged between the tube body and the sleeve, and the heat conductivity coefficient of the heat conducting member is higher than the heat conductivity coefficient of air.

[0009] In an embodiment of the present application, at least one of the outer wall of the tube body and the inner wall of the sleeve is in contact with the heat conducting member.

[0010] In one embodiment of the present application, the heat conductive member is a heat conductive film wrapped around the outer wall of the tube body.

[0011] In one embodiment of the present application, the heat conducting member is a heat conducting sheet sandwiched between the tube body and the sleeve.

[0012] In one embodiment of the present application, the heat conducting member is a rib protruding from the outer wall of the tube body toward the sleeve;

[0013] And / or, the heat conducting member is a rib protruding from the inner wall of the sleeve toward the tube body.

[0014] In one embodiment of the present application, the heat conductive member is a magnesium oxide powder structure or a thermal conductive silicone grease structure filled between the sleeve and the tube body.

[0015] In one embodiment of the present application, the heat conductive member is an insulating member.

[0016] In one embodiment of the present application, the sleeve includes a metal tube body and an insulating coating provided on the outer wall of the metal tube body, and the insulating coating is a ceramic layer.

[0017] In one embodiment of the present application, the tube body is filled with an insulating heat conductor, and the insulating heat conductor isolates the heating element from the tube wall of the tube body.

[0018] In one embodiment of the present application, the heating element includes two heating sections arranged side by side, and each of the heating sections is provided with a first lead-out rod and a second lead-out rod at both ends, respectively. The two first lead-out rods are electrically connected at the first end, and the two second lead-out rods extend out at the second end to form the two connection terminals.

[0019] In one embodiment of the present application, the heating assembly further includes a flange mounting seat, which is connected to an open end of the sleeve and is opened corresponding to the position of the sleeve to allow the heating tube to extend out.

[0020] To achieve the above-mentioned purpose, the present application also provides a water heater, comprising an inner tank and the above-mentioned heating component, wherein the sleeve of the heating component extends into the inner tank.

[0021] In the heating assembly of the technical solution of the utility model, the heating tube is inserted in the sleeve, and the heating tube includes a tube body and a heating element arranged 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. The two terminal ends of the heating element are extended from the second end to be electrically connected to an external power source, thereby realizing the normal heating function of the heating tube in the sleeve. In this embodiment, a heat conductive element with a thermal conductivity coefficient higher than the thermal conductivity coefficient of air is arranged between the tube body and the sleeve. The heat conductive element can quickly conduct the heat of 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 tube surface temperature of the heating assembly, reduce the generation of scale, and improve the bathing water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 This is a structural schematic diagram of an embodiment of a heating tube in a heating assembly of the utility model;

[0024] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0025] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0026] Figure 4 This is a schematic diagram of the matching structure of the sleeve and the flange mounting seat in the heating assembly of the utility model;

[0027] Figure 5 This is a structural schematic diagram of an embodiment in which the heat-conducting member in the heating assembly of the utility model is a heat-conducting sheet;

[0028] Figure 6 for Figure 5 A partial enlarged view of point C in the middle;

[0029] Figure 7 for Figure 5 A cross-sectional view of an embodiment;

[0030] Figure 8 This is a schematic structural diagram of an embodiment in which the heat-conducting member in the heating assembly of the utility model is a heat-conducting film;

[0031] Fig. 9 for Figure 8 A partial enlarged view of point D in the middle;

[0032] Fig.10 It is a structural schematic diagram of an embodiment of the utility model in which the heat-conducting member in the heating assembly is a rib of the sleeve toward the heating tube;

[0033] Fig.11 for Fig.10 A partial enlarged view of point F in the middle;

[0034] Fig.12 It is a schematic structural diagram of an embodiment in which the heat-conducting member in the heating assembly of the utility model is a rib of the heating tube toward the sleeve;

[0035] Fig.13 for Fig.12 A partial enlarged view of the G in the middle;

[0036] Fig.14 for Fig.12 A cross-sectional view of an embodiment;

[0037] Fig.15 This is a schematic structural diagram of an embodiment of the utility model in which the heat-conducting member in the heating assembly is a filled heat-conducting material;

[0038] Fig.16 for Fig.15 A partial enlarged view of point E in the middle;

[0039] Fig.17 It is a structural schematic diagram of an embodiment of the water heater of the utility model.

[0040] Description of Figure Numbers:

[0041] Label name Label name 1 Heating components 123 Insulation thermal conductor 11 casing 13 Thermal Conductors 12 Heating tube 14 Flange Mount 121 tube body 2 Liner 122 Heating element 201 Bile 1221 Heating section 31 Water inlet pipe 1222 First lead rod 32 Outlet pipe 1223 The second lead rod

[0042] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

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

[0045] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0047] The heating assembly is used as a heating element in an electric water heater. A heating assembly such as a dry-type heater generally has a heating tube and a sleeve. The sleeve is arranged inside the inner tank, and the heating tube is placed in the sleeve. When the heating tube is working, the heating tube is energized to convert electrical energy into heat 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.

[0048] However, in the related art, the gap between the heating tube and the sleeve is large, resulting in the heat generated by the heating tube not being able to be transferred to the water in the inner tank through the sleeve in time. The heat accumulates between the heating tube and the sleeve, resulting in the inner wall temperature of the sleeve being 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 component. At the same time, the heat accumulation inside the sleeve will also cause the outer wall temperature of the sleeve itself to be too high, and high temperature is more conducive to scale formation. Scale is generated, falls off, regenerated, and falls off again on the surface of the heating component, and is deposited in the inner tank of the water heater to breed bacteria, affecting the quality of bathing water.

[0049] Based on this, the utility model proposes a heating component 1, which aims to improve the heat transfer efficiency of the heating component 1, improve the high temperature environment of the heating pipe, reduce the pipe surface temperature of the heating component, reduce the generation of scale, and improve the bathing water quality. The structure of the heating component 1 is described below in the form of an embodiment.

[0050] In the embodiment of the present utility model, Figure 1 , Figure 4 as well as Figure 5 As shown, the heating assembly 1 includes a sleeve 11 , a heating tube 12 and a heat conducting member 13 .

[0051] One end of the sleeve 11 is closed and the other end is open; the heating tube 12 is inserted into the sleeve 11, and the heating tube 12 includes a tube body 121 and a heating element 122 arranged in the tube body 121. The tube body 121 has a first end and a second end opposite to each other along 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, and the heating element 122 has two connection terminals extending from the second end; the heat conductive element 13 is arranged between the tube body 121 and the sleeve 11, and the heat conductivity coefficient of the heat conductive element 13 is higher than the heat conductivity coefficient of the air.

[0052] In this embodiment, one end of the sleeve 11 is closed and the other end is open. The closed end is used to extend into the inner tank 2 of the water heater, and the open end is used for the heating tube 12 to be inserted into the sleeve 11. The sleeve 11 can protect the heating tube 12, prevent the heating tube 12 from directly contacting the water in the inner tank 2 of the water heater, and improve the safety of water use. 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, both of which extend from the second end to the open end of the sleeve 11 to play a role in electrical connection with the power supply component outside the sleeve 11, so as to ensure the normal heating function of the heating tube 12. It is understandable that since the heating tube 12 is inserted into the sleeve 11, in actual application (for example, when the heating tube fails and needs to be repaired or replaced), it is necessary to remove or install the heating tube 12 from the sleeve 11. There will be 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, and the thermal conductivity coefficient of the air is not very high, and the heat transfer efficiency is poor. Based on this, in this embodiment, a heat conductor 13 is arranged between the tube body 121 and the sleeve 11. The thermal conductivity coefficient of the heat conductor 13 is higher than the thermal conductivity coefficient of the air, thereby accelerating the efficiency of the heat transfer of the heating tube 12 to the sleeve 11 and improving the heat transfer efficiency of the heating component 1.

[0053] In practical applications, the specific structure and material of the heat conductor 13 can be determined according to the actual situation, for example, it can be a sheet structure, a strip structure, a powder structure, a film structure or other types of structures. The heat conductor 13 can be made of metal materials or non-metallic materials with high thermal conductivity. The heat conductor 13 is arranged between the tube body 121 and the sleeve 11. It can be understood that the heat conductor 13 can only contact the tube body 121, or can only contact the sleeve 11, or can contact both the tube body 121 and the sleeve 11, or can also be not in contact with the tube body 121 and the sleeve 11. As long as the heat conductor 13 is located 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.

[0054] It can be understood that the tube body 121 and the heating element 122 are insulated to prevent the leakage problem caused by the electrical conduction between the heating element 122 and the tube body 121, and at the same time, the tube body 121 can quickly conduct the heat inside it to the outside. Optionally, the tube body 121 can be a metal tube or a non-metallic tube with good thermal conductivity. The tube body 121 itself can be an insulating material or a non-insulating material. When it is a non-insulating material, it can be isolated and insulated from the heating element 122 by filling the inside of the tube body 121 with insulating material. Optionally, the cross-sectional shape of the tube body 121 can be circular, semicircular, square, triangular or other special-shaped shapes. In practical applications, the tube body 121 can be set as a circular tube that is easy to form.

[0055] In practical applications, the specific structure of the heating element 122 can be determined according to the actual situation, such as a resistance wire structure with high heating efficiency alone, or a resistance wire and a wire, a guide rod, etc. The heating element 122 has two terminals, which are a positive terminal and a negative terminal.

[0056] It should be noted that the two terminal ends of the heating element 122 of the heating tube 12 in this embodiment extend from the same end of the tube body 121. Compared with the U-shaped heating tube 12 that is bent as a whole in the related art, the heating tube 12 in this embodiment does not need to be folded in half for hydraulic operation, and the tube body 121 has higher machinability. The outer diameter of the heating tube can be processed by a multi-roller tube shrinking machine and 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, thereby further accelerating the heat transfer of the heating tube 12 to the sleeve 11.

[0057] In the heating assembly 1 of the technical solution of the utility model, the heating tube 12 is inserted into the sleeve 11. The heating tube 12 includes a tube body 121 and a heating element 122 arranged 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 are extended from the second end to be electrically connected to an external power source, thereby realizing the normal heating function of the heating tube 12 in the sleeve 11. In this embodiment, a heat conductive element 13 with a heat conductivity coefficient higher than that of air is arranged between the tube body 121 and the sleeve 11. The heat conductive element 13 can quickly conduct the heat of 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 can reduce the tube surface temperature of the heating assembly 1, reduce the generation of scale, and improve the bathing water quality.

[0058] In one embodiment of the present application, Figures 5 to 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 conducting member 13 .

[0059] It is understandable that the heat conducting member 13 may only contact the outer wall of the tube body 121; or, the heat conducting member 13 may only contact the inner wall of the sleeve 11; or, the heat conducting member 13 may contact both the outer wall of the tube body 121 and the inner wall of the sleeve 11. The specific arrangement of the heat conducting member 13 may be determined according to actual conditions and is not limited here.

[0060] In this embodiment, the heat conductive member 13 is in contact with at least one of the outer wall of the tube body 121 and the inner wall of the sleeve 11 , which can further improve the heat transfer efficiency and facilitate processing and manufacturing compared to a situation where there is no contact.

[0061] In practical applications, the specific structure of the heat conducting member 13 may be determined according to actual conditions.

[0062] In one embodiment of the present application, Figure 8 and Fig. 9 , the heat conducting member 13 is a heat conducting film wound on the outer wall of the tube body 121. In this embodiment, by winding the heat conducting film on the tube body 121, since the heat conducting film has a certain flexibility, when the tube body 121 is inserted into the sleeve 11, the heat conducting film is squeezed and deformed to a certain extent, so as to buffer the mechanical collision between the tube body 121 of the heating tube 12 and the sleeve 11 to avoid damage.

[0063] Optionally, the thermal conductive film can be made of film materials such as polyimide, polyamide, polytetrafluoroethylene, polyvinyl chloride, polypropylene, polyester, polyurethane, etc., which can not only enhance thermal conductivity and increase the life of the heating tube 12, because the material itself has good insulation properties, but also upgrade the heating unit 1 to a reinforced insulation device to further improve its safety performance.

[0064] In one embodiment of the present application, Figures 5 to 7 , the heat conducting member 13 is a heat conducting sheet sandwiched between the tube body 121 and the sleeve 11. In this embodiment, the heat conducting 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, thereby improving the life of the heating tube 12. Optionally, the shape of the heat conducting sheet can be a circular sheet, an arc sheet, a rectangular sheet, or a sheet structure of other shapes.

[0065] In one embodiment of the present application, Figure 12 to Figure 14 , the heat conducting member 13 is a rib protruding from the outer wall of the tube body 121 toward the sleeve 11. In this embodiment, the heat conducting member 13 is a rib provided on 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, which can enhance heat conduction and increase the life of the heating tube 12. Optionally, the rib can be integrally formed with the tube body 121 or the rib can be welded and fixed to the tube body 121. The rib can extend to contact or not contact the inner wall of the sleeve 11.

[0066] In one embodiment of the present application, Fig.10 and Fig.11 , the heat conducting member 13 is a rib protruding from the inner wall of the sleeve 11 toward the tube body 121. In this embodiment, the heat conducting member 13 is a rib provided on 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, which can enhance heat conduction and increase the life of the heating tube 12. Optionally, the rib can be formed by pressing the sleeve 11 inward. The rib can extend to contact or not contact the inner wall of the tube body 121.

[0067] In one embodiment of the present application, Fig.15 and Fig.16 , the heat conductor 13 is a magnesium oxide powder structure or a thermal grease structure filled between the sleeve 11 and the tube body 121. In this embodiment, the heat conductor 13 is a thermally conductive material directly filled between the sleeve 11 and the tube body 121, such as magnesium oxide powder or thermally conductive silicone grease, which can enhance thermal conductivity and increase the life of the heating tube 12, because the material itself has good insulation properties, and can also upgrade the heating component 1 to a reinforced insulation device to further improve its safety performance. In actual application, in this embodiment, the open end of the sleeve 11 needs to be sealed to prevent leakage of the heat conductor 13.

[0068] It should be noted that, in actual application, the specific structure of the heat conducting member 13 may not be limited to the above-mentioned embodiments, and other embodiments may also be adopted, which are not limited here.

[0069] In one embodiment of the present application, Figure 8 and Fig. 9 The heat conducting member 13 is an insulating member. Such a configuration can not only enhance the heat conduction and prolong the 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.

[0070] In one embodiment of the present application, the sleeve 11 includes a metal tube body and an insulating coating provided on the outer wall of the metal tube body, and the insulating coating is a ceramic layer.

[0071] 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 conductor 13, and then transferred to the water in the inner tank through the metal tube body of the sleeve 11 and the external insulating coating. However, the insulating coating in the related art adopts enamel, but due to the influence of the enamel treatment process, the thickness of the enamel layer reaches 200μm~500μm, which is relatively thick. At the same time, enamel is a poor conductor of heat. The heat of the sleeve 11 itself cannot be quickly transferred to the water, resulting in the outer wall temperature of the sleeve 11 being too high, causing the generation of scale. The scale is generated, falls off, regenerated, and falls off again on the surface of the sleeve 11, and is deposited in the inner tank to breed bacteria, affecting the user's bathing water quality. Based on this, in this embodiment, by setting the insulating coating as a ceramic layer, the thermal conductivity of the ceramic layer is higher than the thermal conductivity of the enamel, and the thickness of the ceramic layer can be 10μm~50μm, the thickness of the insulating coating is reduced, thereby reducing the heat transfer path, further improving the heat transfer efficiency of the heating component 1, and avoiding the generation of scale.

[0072] In one embodiment of the present application, Figures 1 to 3 The tube body 121 is filled with an insulating heat conductor 123 , and the insulating heat conductor 123 isolates the heating element 122 from the tube wall of the tube body 121 .

[0073] In this embodiment, the insulating heat conductor 123 can transfer the heat of the heating element 122 to the tube wall of the tube body 121, which is conducive to the transfer of heat of the heating element 122; furthermore, the insulating heat conductor 123 can isolate the heating element 122 from the inner wall of the tube body 121, avoiding the risk of leakage caused by the heating element 122 contacting the inner wall of the tube body 121. Optionally, the insulating heat conductor 123 is magnesium oxide powder, which has good insulation and thermal conductivity, can effectively isolate the current inside the heating tube, and transfer the heat of the resistance wire to the tube body 121 in time, playing the role of 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.

[0074] In this arrangement, an insulating heat conductor 123 is provided between the heating element 122 and the tube body 121, a heat conductor 13 is provided between the tube body 121 and the inner wall of the sleeve 11, and the outer wall of the sleeve 11 has a ceramic layer, thereby forming a three-layer insulating heat-conducting structure in the heating component 1, which can not only enhance the insulation performance of the heating component 1 to ensure safety, but also improve the heat transfer efficiency and extend the service life of the heating tube 12.

[0075] In one embodiment of the present application, Figures 1 to 3 The heating element 122 includes two heating sections 1221 arranged side by side, and each heating section 1221 is provided with a first lead-out rod 1222 and a second lead-out rod 1223 at both ends. The two first lead-out rods 1222 are electrically connected at the first end, and the two second lead-out rods 1223 extend out at the second end to form two wiring terminals.

[0076] 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, which are electrically connected through two first lead-out rods 1222, so as to avoid direct bending of the resistance wire, reduce damage to the resistance wire, and thus improve the life of the heating tube 12. The resistance wire is usually made of metal or alloy material, and has a certain elasticity. If the resistance wire is directly bent, the resistance wire will be deformed, and the elasticity of the resistance wire will make it try to return to its original shape, so that the two ends of the resistance wire may contact the inner wall of the tube body 121. By arranging the two resistance wires side by side, it is conducive to maintaining the relative position between the two resistance wires, avoiding the two resistance wires from contacting each other, and avoiding the resistance wire from contacting the inner wall of the tube body 121.

[0077] In practical applications, the first lead-out rod 1222 can be a conductive rod, a wire, a conductive sheet or other conductive structures. 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 area of ​​the cross section of the first lead-out rod 1222 gradually decreases from the middle of the first lead-out rod 1222 to the connection end, so that the connection end forms a cone, which is conducive to the spiral resistance wire being sleeved on the connection end, increasing the contact area between the first lead-out rod 1222 and the resistance wire, and ensuring the electrical connection between the first lead-out rod 1222 and the resistance wire.

[0078] The heating section 1221 is provided with a second lead-out rod 1223 at the second end, and the two second lead-out rods 1223 are extended from the second end of the tube body 121 to form two terminals for electrical connection with an external power source. 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 described in detail here.

[0079] The tube body 121 is filled with magnesium oxide powder with good thermal conductivity. The compactness of the magnesium oxide powder is related to the thermal conductivity. In the related art, in order to realize the overall folding and extrusion of the heating tube 1, the magnesium oxide powder filled inside needs to be in a loose state. The heat transfer efficiency of the loose magnesium oxide powder is poor, which will cause the internal heating wire to overheat and dry burn and break. In this embodiment, the two second lead-out rods 1223 are extended from the second end of the tube body 121, and there is no need to bend the heating tube 12 as a whole, so there is no need to reduce the compactness of the magnesium oxide powder. In this way, the compactness of the magnesium oxide powder can be ensured, the thermal conductivity efficiency can be improved, and then the heating wire can be prevented from overheating due to dry burning, thereby reducing the occurrence of malfunctions.

[0080] In one embodiment of the present application, Figures 4 to 5The heating assembly 1 further includes a flange mounting seat 14 , which is connected to an open end of the sleeve 11 and is opened at a position corresponding to the sleeve 11 to allow the heating tube 12 to extend out.

[0081] In this embodiment, the sleeve 11 is mounted on one end of the flange mounting seat 14. Optionally, the sleeve 11 and the flange mounting seat 14 may be integrally formed or welded together. When applied to a water heater, the flange mounting seat 14 is fixed to the inner tank, the sleeve 11 is located 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 outside the flange mounting seat 14 to facilitate connection with an external power supply structure.

[0082] The utility model also provides a water heater, such as Fig.17 The water heater comprises an inner tank 2 and a heating assembly 1. The specific structure of the heating assembly 1 refers to the above embodiment. Since the water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the sleeve 11 of the heating assembly 1 extends into the inner tank 2.

[0083] In this embodiment, the inner tank 2 has an inlet pipe 31 and an outlet pipe 32. The inlet pipe 31 is used to bring cold water into the inner tank 2, and the outlet pipe 32 is used to discharge hot water from the inner tank 2. The inner tank 2 is provided with a tank opening 201. By fixing the flange mounting seat 14 to the tank opening 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 by the sleeve 11. When the heating tube 12 fails, there is no need to remove the flange mounting seat 14 or drain the water in the inner tank 2. The heating tube 12 can be directly removed, and the disassembly and installation are very simple.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A heating component, characterized in that: include: a cannula, which is closed at one end and open at the other; a heating tube, inserted in the sleeve, the heating tube comprising a tube body and a heating element arranged in the tube body, the tube body having a first end and a second end opposite to each other in the extending direction of the sleeve, the first end being close to the closed end of the sleeve, the second end being close to the open end of the sleeve, the heating element having two connection terminals extending out of the second end; and The heat conducting member is arranged between the tube body and the sleeve, and the heat conductivity coefficient of the heat conducting member is higher than the heat conductivity coefficient of air.

2. The heating assembly according to claim 1, characterized in that At least one of the outer wall of the tube body and the inner wall of the sleeve is in contact with the heat conducting member.

3. The heating assembly according to claim 2, characterized in that The heat conducting member is a heat conducting film wound around the outer wall of the tube body.

4. The heating assembly according to claim 2, characterized in that The heat conducting member is a heat conducting sheet sandwiched between the tube body and the sleeve.

5. The heating assembly according to claim 2, characterized in that The heat conducting member is a rib protruding from the outer wall of the tube body toward the sleeve; And / or, the heat conducting member is a rib protruding from the inner wall of the sleeve toward the tube body.

6. The heating assembly according to claim 2, characterized in that The heat conducting member is a magnesium oxide powder structure or a heat conducting silicone grease structure filled between the sleeve and the tube body.

7. The heating assembly according to any one of claims 1 to 6, characterized in that The heat conducting member is an insulating member.

8. The heating assembly according to any one of claims 1 to 6, characterized in that The sleeve comprises a metal tube body and an insulating coating arranged on the outer wall of the metal tube body, and the insulating coating is a ceramic layer.

9. The heating assembly according to any one of claims 1 to 6, characterized in that The tube body is filled with an insulating heat conductor, which isolates the heating element from the tube wall of the tube body.

10. The heating assembly according to any one of claims 1 to 6, characterized in that The heating element includes two heating sections arranged side by side, and each of the heating sections has a first lead-out rod and a second lead-out rod at both ends, the two first lead-out rods are electrically connected at the first end, and the two second lead-out rods extend out at the second end to form the two connection terminals.

11. The heating assembly according to any one of claims 1 to 6, characterized in that The heating assembly also includes a flange mounting seat, which is connected to an open end of the sleeve and is opened corresponding to the position of the sleeve to allow the heating tube to extend out.

12. A water heater, characterized in that: It comprises an inner container and a heating component as claimed in any one of claims 1 to 11, wherein the sleeve of the heating component extends into the inner container.

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