Heating pipe, dry heater and water heater

Abstract

The invention discloses a heating pipe, a dry heater and a water heater, and relates to the technical field of water heaters. Wherein the heating pipe comprises a pipe body and a heating piece, and the pipe body is provided with a first end and a second end which are opposite to each other; the heating part comprises two heating sections arranged in the pipe body side by side, the two heating sections are electrically connected at the first ends, the two heating sections are provided with wiring ends at the second ends respectively, and the two wiring ends both extend out of the second ends. According to the technical scheme, folding oil pressure operation does not need to be carried out on the pipe body, the heating pipe machining technology is simplified, and the wire breaking risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water heaters, and in particular to a heating tube, a dry heater and a water heater. Background Art

[0002] Dry heaters are used as heating elements in storage electric water heaters. Dry heaters generally have a heating tube and a heater sleeve. The heater sleeve is fixed inside the inner tank, and the heating tube is placed in the heater sleeve. When the heating tube is working, the heating tube is energized to convert electrical energy into heat energy, and the heat is exchanged with the water in the inner tank through the heater sleeve, thereby heating the water in the inner tank.

[0003] The heating tube of the existing dry heater needs to go through processes such as folding and hydraulic forming during the processing. Since the heating tube is provided with a heating wire and filled with magnesium oxide powder, during the folding and hydraulic forming process, the external force squeezes the tube material of the heating tube and the magnesium oxide powder in the heating tube, which will cause mechanical damage to the resistance wire in the heating tube, and easily cause the resistance wire to be damaged prematurely during use. Summary of the invention

[0004] The main purpose of the present invention is to provide a heating tube, a dry heater and a water heater, aiming to simplify processing and reduce the risk of wire breakage.

[0005] To achieve the above object, the heating tube proposed by the present invention comprises:

[0006] a tube having opposing first and second ends; and

[0007] The heating element comprises two heating sections arranged side by side in the tube body, the two heating sections are electrically connected at the first end, and the two heating sections are respectively provided with wiring terminals at the second end, and the two wiring terminals both extend out of the second end.

[0008] In one embodiment of the present application, each of the heating sections is provided with a first lead-out rod corresponding to the first end, and two of the first lead-out rods at least partially extend out of the first end and are electrically connected outside the first end.

[0009] In one embodiment of the present application, the two first lead-out bars are fixed by welding;

[0010] Alternatively, the heating tube further comprises an electrical connector provided outside the tube body, and the two first lead-out rods are electrically connected via the electrical connector;

[0011] Alternatively, the two first lead-out rods are an integral bent part.

[0012] In one embodiment of the present application, the heating element is a resistance wire, and the resistance wire is bent to form the two heating sections;

[0013] Alternatively, the heating section is a resistance wire, and the heating tube further includes an electrical connection member for conducting the two resistance wires.

[0014] In an embodiment of the present application, the heating tube further includes an insulating sleeve provided at the first end, and the insulating sleeve is sleeved outside the two first lead rods.

[0015] In an embodiment of the present application, the heating tube further includes insulating plugs respectively provided at the first end and the second end of the tube body. The two insulating plugs are hermetically connected to the tube orifices of the tube body to form a sealed cavity, and both ends of the heating element are respectively fixed to the two insulating plugs.

[0016] In an embodiment of the present application, the insulating plug is provided with two spaced positioning holes. The two first lead rods respectively pass through the two positioning holes located at the first end, and the two wiring terminals respectively pass through the two positioning holes located at the second end;

[0017] The positioning hole and the corresponding heating section are coaxially arranged.

[0018] In an embodiment of the present application, the two wiring terminals are arranged at an angle, and the distance between the two wiring terminals is gradually enlarged in a direction away from the tube body.

[0019] In an embodiment of the present application, the wiring terminal includes:

[0020] A second lead rod, one end of which is connected to the corresponding heating section and the other end extends out of the second end of the tube body; and

[0021] An insulating wrapping member, which is connected to the second end and wraps outside the second lead rod, and the end of the second lead rod away from the tube body is exposed outside the insulating wrapping member.

[0022] In an embodiment of the present application, the tube body is filled with an insulating heat-conducting material, and the insulating heat-conducting material isolates the two heating sections and isolates the heating element from the tube wall of the tube body;

[0023] And / or, the tube body is an insulating heat-conducting member.

[0024] To achieve the above object, the present application further provides a dry-type heater, including:

[0025] A heater sleeve, one end of which is closed and the other end is open;

[0026] A mounting seat, which is connected to the open end of the heater sleeve and is open corresponding to the position of the heater sleeve; and

[0027] The above-mentioned heating tube is disposed inside the heater sleeve, and the wiring ends of the heating tube are disposed outside the heater sleeve.

[0028] To achieve the above object, the present application further provides a water heater, which includes an inner tank and the above-mentioned heating tube, and the heating tube is adapted to heat the water inside the inner tank.

[0029] To achieve the above object, the present application further provides a water heater, which includes the above-mentioned dry heater and an inner tank. The closed end of the heater sleeve extends into the inner tank, and the mounting seat is fixed to the mouth of the inner tank.

[0030] In the technical solution of the heating tube of the present invention, two heating sections are arranged side by side in the tube body. By electrically connecting the two heating sections at the first end of the tube body, wiring ends are respectively arranged at the second end of the tube body, and both of the two wiring ends extend out of the second end for electrically connecting with a power source outside the tube body, so as to realize the normal heating function of the two heating sections in the tube body. In this embodiment, by making both wiring ends of the heating element extend out from the same end of the tube body, it is not necessary to perform a folding and oil pressure operation on the tube body, thus simplifying the processing technology and reducing the mechanical damage to the tube body and the heating sections. At the same time, it is convenient to control the outer diameter of the tube body, with high processing precision, greatly reducing the gap between the heating tube and the inner wall of the heater sleeve, ensuring that the heat of the heating tube can be promptly transferred to the sleeve and perform heat exchange with water, and ensuring the service life of the heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0032] Figure 1 It is a schematic structural diagram of an embodiment of the heating tube provided by the present invention;

[0033] Figure 2 For Figure 1 The partial enlarged view at A in

[0034] Figure 3 For Figure 1 The partial enlarged view at B in

[0035] Figure 4 It is a schematic structural diagram of an embodiment in which two first lead rods at the first end of the tube body in the present invention are electrically connected;

[0036] Figure 5Schematic structural diagram of an embodiment in which two first lead rods at the first end of the tube body are electrically connected through an electrical connector in the present invention;

[0037] Figure 6 Schematic structural diagram of a terminal at the second end of the tube body in the present invention;

[0038] Figure 7 Schematic structural diagram of a heater sleeve and a mounting seat in an embodiment of the present invention;

[0039] Figure 8 Schematic structural diagram of an embodiment of a water heater provided by the present invention.

[0040] Explanation of reference numerals in the drawings:

[0041] Reference numeral Name Reference numeral Name 1 Heating tube 15 Insulating plug 11 Tube body 151 Positioning hole 12 Heating element 16 Insulating heat-conducting material 121 Heating section 2 Heater sleeve 122 First lead rod 3 Mounting seat 123 Terminal 4 Inner tank 1231 Second lead rod 41 Tank opening 1232 Insulating wrapper 51 Water inlet pipe 13 Electrical connector 52 Water outlet pipe 14 Insulating sleeve

[0042] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0045] In addition, if there are descriptions such as "first" and "second" in the embodiments of the present invention, the descriptions of "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0046] For the heating tubes of existing dry heaters, during the processing, processes such as overall folding and hydroforming are required, and a long straight round tube is processed into a long straight oval tube body after folding. Since heating wires are arranged in the heating tubes and magnesium oxide powder is filled in the heating tubes, during the hydroforming process, the external force extrudes the pipe material and the magnesium oxide powder in the heating tube, causing mechanical damage to the resistance wires in the heating tubes, and easily resulting in premature damage to the resistance wires during use. The existing technology has problems of complex heating tube processing technology and easy breakage of resistance wires.

[0047] Based on this, the present invention proposes a heating tube 1, aiming to simplify the processing technology and reduce the risk of wire breakage without overall bending of the electric heating tube. The structure of this heating tube 1 will be described below in the form of embodiments.

[0048] Please refer to Figures 1 to 5 , in the embodiment of the present invention, the heating tube 1 includes a tube body 11 and a heating element 12.

[0049] The tube body 11 has opposite first and second ends; the heating element 12 includes two heating sections 121 arranged side by side in the tube body 11, the two heating sections 121 are electrically connected at the first end, and wiring terminals 123 are respectively arranged at the second ends of the two heating sections 121, and both wiring terminals 123 extend out of the second end.

[0050] In this embodiment, the tube body 11 functions to install the heating element 12 and conduct the heat of the heating element 12 out. It can be understood that the tube body 11 and the heating element 12 are insulated to prevent leakage of electricity caused by the heating element 12 and the tube body 11 conducting electricity, and at the same time, the tube body 11 can quickly conduct the heat inside it to the outside. Optionally, the tube body 11 can be a metal tube or a non-metal tube with good heat conduction performance. The tube body 11 itself can be an insulating material or a non-insulating material. When it is a non-insulating material, the tube body 11 can be insulated from the heating element 12 by filling an insulating material inside the tube body 11. Optionally, the cross-sectional shape of the tube body 11 can be circular, semi-circular, square, triangular or other special-shaped shapes. In actual applications, the tube body 11 can be set as a circular tube that is easy to form.

[0051] The heating element 12 includes two heating sections 121 arranged side by side. It can be understood that the two heating sections 121 are arranged at intervals. The heating section 121 can be a resistance wire with high heat generation efficiency. In actual applications, the heating element 12 can only include the heating section 121 or include the heating section 121 and other conductive structures, etc. When the heating element 12 only includes the heating section 121, the heating element 12 can be an overall resistance wire structure. When the heating element 12 includes the heating section 121 and other conductive structures, lead bar structures or wire structures, etc. can be arranged at both ends of the resistance wire.

[0052] The two heating sections 121 are electrically connected to the first end of the tube body 11. It can be understood that the electrical connection position of the two heating sections 121 can be located outside the first end of the tube body 11 or inside the first end of the tube body 11. The two heating sections 121 are respectively provided with terminal ends 123 at the second end of the tube body 11. These two terminal ends 123 are respectively a positive terminal end and a negative terminal end, which are used to extend out of the second end of the tube body 11 to be electrically connected to an external power supply structure, so as to realize the energized heating of the two heating sections 121. It can be seen from this that the terminal ends 123 of the two heating sections 121 both extend out from the same end of the tube body 11, and there is no need to perform a folding oil pressure operation on the tube body 11, which simplifies the process and reduces the mechanical damage to the tube body 11 and the resistance wire.

[0053] The specific structure of the terminal end 123 can be determined according to the actual situation. For example, it can be a lead rod structure, a wire structure, a conductive sheet structure or other terminal structures, etc. As long as it can ensure the electrical connection between the heating section 121 inside the tube body 11 and the external power supply, its specific structure is not limited here.

[0054] It should be noted that in actual application, the tube body 11 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 relatively loose state, and the heat transfer efficiency of the relatively loose magnesium oxide powder is poor, which will cause the internal electric heating wire to overheat and cause dry burning and wire breakage. In this embodiment, there is no need to integrally bend the heating tube 1, 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 can be improved, and further the dry burning and overheating of the electric heating wire can be prevented, and the occurrence of faults can be reduced.

[0055] In the heating tube 1 of the technical solution of the present invention, two heating sections 121 are arranged side by side in the tube body 11. By electrically connecting the two heating sections 121 at the first end of the tube body 11, the two heating sections 121 are respectively provided with terminal ends 123 at the second end of the tube body 11, and these two terminal ends 123 both extend out of the second end for electrically connecting to the power supply outside the tube body 11, so as to realize the normal heating function of the two heating sections 121 in the tube body 11. In this embodiment, by making the two terminal ends 123 of the heating element 12 both extend out from the same end of the tube body 11, there is no need to perform a folding oil pressure operation on the tube body 11, which simplifies the processing technology and reduces the mechanical damage to the tube body 11 and the heating section 121; at the same time, it is convenient to control the outer diameter of the tube body 11, the processing accuracy is high, and the gap between the heating tube 1 and the inner wall of the heater sleeve 2 is greatly reduced, which can ensure that the heat of the heating tube 1 is timely transferred to the sleeve and heat exchanged with water, and ensure the service life of the heating tube 1.

[0056] In an embodiment of the present application, as Figure 2 , Figure 4 andFigure 5 For each heating section 121, a first lead bar 122 is provided at the corresponding first end. The two first lead bars 122 at least partially extend out of the first end and are electrically connected outside the first end.

[0057] It can be understood that the heating section 121 is a structure with relatively high heat generation efficiency, such as a resistance wire. By providing a first lead bar 122 at one end of each heating section 121 and electrically connecting the two first lead bars 122 to achieve electrical conduction of the two heating sections 121, it is possible to avoid directly bending the resistance wire, reduce damage to the resistance wire, and thus improve the service life of the heating tube 1. The resistance wire is usually made of metal or alloy materials and has a certain elasticity. When directly bending the resistance wire, the resistance wire will deform, and its elasticity will cause it to try to return to its original shape, so that the two ends of the resistance wire may come into contact with the inner wall of the tube body 11. By arranging the two resistance wires side by side, it is beneficial to maintain the relative position between the two resistance wires, avoid the two resistance wires from contacting each other, and at the same time avoid the resistance wire from contacting the inner wall of the tube body 11.

[0058] In addition, the two first lead bars 122 at least partially extend out of the first end and are electrically connected outside the first end. Compared with the method of electrically connecting the resistance wire after extending it out of the tube body 11, it can prevent the situation of overheating of the temperature outside the tube body 11.

[0059] In practical applications, the first lead bar 122 can be a conductive bar, a wire, a conductive sheet, or other conductive structures, etc. The first lead bar 122 and the heating section 121 can be connected by welding, winding, or other electrical connection methods, etc. It can be understood that the first lead bar 122 has a connection end. From the middle of the first lead bar 122 to the direction of the connection end, the cross-sectional area of the first lead bar 122 gradually decreases, so that the connection end forms a cone shape, which is beneficial for the spiral resistance wire to be sleeved on the connection end, increasing the contact area between the first lead bar 122 and the resistance wire and ensuring the electrical connection between the first lead bar 122 and the resistance wire.

[0060] Furthermore, the electrical connection method of the two first lead bars 122 can be determined according to the actual situation.

[0061] In an embodiment of the present application, as Figure 4 , the two first lead bars 122 are fixed by welding. It can be understood that considering that the ends of the two first lead bars 122 connected to the heating section 121 are spaced apart, the ends of the two first lead bars 122 away from the heating section 121 can be bent towards each other so that the two first lead bars 121 are in contact, and then fixed by welding. Optionally, resistance welding or argon arc welding can be used, etc.

[0062] In an embodiment of the present application, as Figure 5The heating tube 1 also includes an electrical connector 13 arranged outside the tube body 11, and the two first lead-out rods 122 are electrically connected through the electrical connector 13. Optionally, the electrical connector 13 can be a metal conductive part or a non-metallic conductive part. In practical applications, considering the convenience and reliability of connection, the electrical connector 13 uses a metal conductive part. Metal usually has high strength and hardness, can withstand certain mechanical stress, and ensure the firmness and stability of the connection. Generally, the electrical connector 13 is made of cast iron. The electrical connector 3 can be connected to the two first lead-out rods 122 by welding, screwing or winding. In practical applications, considering the convenience and reliability of processing, the two first lead-out rods 122 are welded and fixed to the electrical connector 13. Optionally, resistance welding or argon arc welding can be used.

[0063] In one embodiment of the present application, the two first lead-out bars 122 are bent and connected as one body. In this embodiment, the two first lead-out bars 122 are set as an integral structure, so there is no need to perform an additional process of electrically connecting the two first lead-out bars 122, which further simplifies the processing technology. In practical applications, a conductor can be bent to form two first lead-out bars 122, and the ends of the two first lead-out bars 122 away from the bend are respectively connected to the two heating sections 121.

[0064] It should be noted that, in actual application, the electrical connection method of the two first lead-out rods 122 may not be limited to the above-mentioned embodiments, and other embodiments may also be adopted, which are not limited here.

[0065] In an embodiment of the present application, the heating element 12 is a resistance wire, and the resistance wire is bent to form two heating sections 121 .

[0066] In the prior art, the resistance wire is inserted into the tube body 11 and then the tube body 11 is bent. In comparison, directly bending the resistance wire has low processing difficulty, is easy to operate, and causes little mechanical damage to the resistance wire.

[0067] In one embodiment of the present application, Figure 2 , Figure 4 as well as Figure 5 The heating tube 1 further includes an insulating sleeve 14 disposed at the first end, and the insulating sleeve 14 is sleeved on the outside of the two first lead-out rods 122 .

[0068] It can be understood that when the heating tube 1 is applied to a dry heater, the heating tube 1 is placed in the heater sleeve 2. Since the two first lead rods 122 are electrically connected outside the tube body 11, in order to prevent the first lead rod 122 from being electrically connected to the heater sleeve 2 and causing electric leakage, in this embodiment, an insulating sleeve 14 is provided at the first end of the tube body 11, and the insulating sleeve 14 is sleeved outside the two first lead rods 122 to isolate the first lead rod 122 from the heater sleeve 2 and improve safety. The outer diameter of the insulating sleeve 14 is smaller than the inner diameter of the heater sleeve 2 to avoid interfering with the installation of the heating tube 1 into the heater sleeve 2.

[0069] It should be noted that when the heating tube 1 is powered on and heated, the temperature inside the heater sleeve 2 is relatively high, reaching a high temperature of 300°C to 400°C. Therefore, the insulating sleeve 14 needs to meet the requirements of no deformation and no change under long-term high-temperature working conditions and maintain good insulation performance. Optionally, the insulating sleeve 14 can be made of a high-temperature-resistant heat-shrinkable sleeve, a glass fiber insulating sleeve, or can also be made of materials such as ceramics, glass, or chemical substances similar to polyimide and its molecular structure, or polyphenylene sulfide, polyether ketone and their molecular structure similar chemical substances, or polytetrafluoroethylene and its molecular structure similar chemical substances.

[0070] Furthermore, the specific structure of the insulating sleeve 14 can be determined according to the actual situation.

[0071] As an example, as Figure 4 in (a) and (b), Figure 5 in (f) and (g), the insulating sleeve 14 is a cylindrical structure. In this embodiment, the insulating sleeve 14 can be directly sleeved on the outer wall of the first end of the tube body 11, and the two can be fixed by bonding or interference fit. In this embodiment, the insulating sleeve 14 can be a straight tube structure or a reduced opening structure, and the insulating sleeve 14 can be a high-temperature-resistant heat-shrinkable sleeve or a glass fiber insulating sleeve, etc. It can be understood that both ends of the insulating sleeve 14 with a cylindrical structure in this embodiment are open, and the heat generated by the first lead rod 122 and the electrical connector 13 located inside the insulating sleeve 14 can be output outward through the open ends of the insulating sleeve 14, thereby further improving the heating efficiency of the heating tube 1.

[0072] As an example, as Figure 4 (c), Figure 5 (d) and (e), the insulating sleeve 14 is a box structure. It can be understood that an accommodation cavity for accommodating the first lead rod 122 and the electrical connector 13 is formed inside the insulating sleeve 14. The insulating sleeve 14 with a box structure can fully or partially wrap the first lead rod 122 and the electrical connector 13, and the insulating sleeve 14 can be made of materials such as ceramic beads, glass beads, or Teflon beads.

[0073] Such as Figure 4 (c) andFigure 5 (e), when the insulating sleeve 14 is fully wrapped, a relatively enclosed cavity is formed by connecting the insulating sleeve 14 to the first end of the pipe body 11. At this time, the wrapping of the first lead bar 122 and the electrical connector 13 is stronger, further improving the electrical isolation effect. In this way, it is necessary to electrically connect the two first lead bars 122 or electrically connect them through the electrical connector 13 first, and then install the insulating sleeve 14.

[0074] Such as Figure 5 (d), when the insulating sleeve 14 is partially wrapped, an opening can be provided on the outer peripheral wall of the insulating sleeve 14. While protecting the first lead bar 122 and the electrical connector 13, heat can be quickly transferred. In addition, in actual application, one end of the insulating sleeve 14 can be connected to the first end of the pipe body 11, so that the two first lead bars 122 extend into the insulating sleeve 14. Then, the electrical connector 13 is placed into the insulating sleeve 14 through the opening and welding operation is carried out. In this embodiment, the insulating sleeve 14 can be adhesively fixed to the first end of the pipe body 11. Or, in some embodiments, two mounting holes can be provided at one end of the insulating sleeve 14 to pass through the two first lead bars 122. Then, the electrical connector 13 is placed into the insulating sleeve 14 from the opening and welded to the two first lead bars 122. After welding, the insulating sleeve 14 is installed and fixed. In this way, the insulating sleeve 14 is directly fixed and limited by the matching structure of the electrical connector 13 and the first lead bar 122, and there is no need to additionally provide a special fixing structure to fix the insulating sleeve 14, further simplifying the assembly process.

[0075] In an embodiment of the present application, such as Figure 1 , the pipe body 11 is filled with an insulating heat-conducting material 16, and the insulating heat-conducting material 16 isolates the two heating sections 121 and isolates the heating element 12 from the inner wall of the pipe body 11.

[0076] The insulating heat-conducting material 16 can conduct the heat of the heating section 121 to the inner wall of the pipe body 11, which is beneficial to transferring the heat of the heating section 121. Moreover, the insulating heat-conducting material 16 can isolate the two heating sections 121 to avoid potential safety hazards caused by the contact of the two heating sections 121. At the same time, the insulating heat-conducting material 16 can isolate the heating element 12 and the inner wall of the pipe body 11 to avoid the risk of electric leakage caused by the contact of the heating element 12 with the inner wall of the pipe body 11. Generally, the insulating heat-conducting material 16 is magnesium oxide powder. Magnesium oxide powder has good insulation performance and heat conductivity, can effectively isolate the current inside the heating pipe, and transfer the heat of the resistance wire to the pipe body 11 in time, playing the role of insulation and heat conduction. The powdery magnesium oxide powder can form a stable support structure in the heating pipe, so that the heating sections 121 of the heating pipe 1 are well fixed and supported. This helps to maintain the relative position between the two heating sections 121 and prevent accidental damage caused by vibration or displacement of the heating sections 121.

[0077] It can be understood that compared with the heating tube 1 of the prior art, the heating tube 1 of the embodiment of the present invention simplifies the processing flow, without processes such as folding and oil pressure forming. The straight tube design facilitates the addition of magnesium oxide powder, making the filling density of the internal magnesium oxide powder high. The heat of the resistance wire can be conducted outward in time, reducing the influence of the high-temperature environment on the resistance wire and ensuring the service life of the resistance wire.

[0078] In one embodiment, in order to prevent the two heating sections 121 from contacting each other, an isolation structure such as a partition (not shown in the figure) can be provided in the tube body 11. The partition is arranged between the two heating sections 121 and is used to isolate the two heating sections 121, thereby preventing the two heating sections 121 from contacting. The partition is made of an insulating material such as silicone oil. Of course, in other embodiments, other support structures can also be used to support the two resistance wires to ensure the relative positions of the two resistance wires, thereby ensuring safety.

[0079] In order to prevent the two heating sections 121 from contacting each other, the length of the heating section 121 can be limited. For example, the length of the heating section 121 is less than five hundred millimeters to reduce the risk of displacement of the two heating sections 121 due to vibration. If the length of the heating section 121 is too long, the heating section 121 is prone to swing when subjected to vibration, increasing uncertainty.

[0080] In one embodiment of the present application, as Figure 2 and Figure 3 , the heating tube 1 further includes insulating plugs 15 respectively arranged at the first end and the second end of the tube body 11. The two insulating plugs 15 are hermetically connected to the pipe orifices of the tube body 11 to form a sealed cavity, and the two ends of the heating element 12 are respectively fixed to the two insulating plugs 15.

[0081] It can be understood that in actual application, the tube body 11 is filled with an insulating heat-conducting material 16. In this embodiment, insulating plugs 15 are arranged at both ends of the tube body 11. The insulating plugs 15 play a role in sealing the pipe orifices, preventing the insulating heat-conducting material 16 from being affected by moisture and at the same time preventing the insulating heat-conducting material 16 from leaking out of the tube body 11; the two ends of the heating element 12 are respectively fixed to the insulating plugs 15 to support the two heating sections 121.

[0082] Furthermore, the insulating plug 15 is provided with two spaced positioning holes 151. The two first lead rods 122 respectively pass through the two positioning holes 151 located at the first end, and the two connection terminals 123 respectively pass through the two positioning holes 151 located at the second end.

[0083] It can be understood that the two positioning holes 151 at the first end are used to fix the two first lead rods 122, and the two positioning holes 151 at the second end are used to fix the two connection terminals 123, so as to be able to position the two heating sections 121, avoid displacement of the two heating sections 121, and ensure safety. In this embodiment, by arranging the two positioning holes 151 at intervals, the two heating sections 121 can be arranged at intervals, which can ensure the gap between the two heating sections 121 and avoid potential safety hazards caused by the two heating sections 121 contacting each other.

[0084] Furthermore, the positioning hole 151 and the corresponding heating section 121 are coaxially arranged. Optionally, the two positioning holes 151 are arranged in parallel, so that the two heating sections 121 are arranged parallel to each other and opposite to each other, avoiding contact between the two heating sections 121.

[0085] Optionally, an interference fit may be provided between the positioning hole 151 and the first lead rod 122, and between the positioning hole 151 and the connection terminal 123, so as to enhance the sealing performance of the pipe body 11 and prevent the insulating and heat-conducting material 16 from being affected by moisture.

[0086] In this embodiment, both ends of the pipe body 11 are open, which is convenient for filling the insulating and heat-conducting material 16; the insulating plugs 15 provided at both ends of the pipe body 11 can fix both ends of the heating element 12, thereby ensuring the relative position of the two heating elements 12 and the pipe body 11, preventing the heating element 12 from contacting the inner wall of the pipe body 11 and causing electric leakage, and the insulating plug 15 plays a supporting role for the heating section 121.

[0087] In an embodiment of the present application, as Figure 6 , the two connection terminals 123 are arranged at an angle, and the distance between the two connection terminals 123 gradually increases in a direction away from the pipe body 11.

[0088] The two connection terminals 123 extend out of the second end of the pipe body 11 for electrical connection with an external power supply. It can be understood that one of the two connection terminals 123 is the positive pole and the other is the negative pole. To ensure wiring safety, it is necessary to increase the creepage distance between the two connection terminals 123 as much as possible to prevent short circuits. In this embodiment, by arranging the distance between the two connection terminals 123 to gradually increase in a direction away from the pipe body 11, the distance between the two connection terminals 123 can be further increased. Optionally, the two connection terminals 123 generally form a "V" - shaped structure.

[0089] As an example, the connection terminal 123 includes a second lead rod 1231 and an insulating wrapping 1232. One end of the second lead rod 1231 is connected to the corresponding heating section 121, and the other end extends out of the second end of the pipe body 11; the insulating wrapping 1232 is connected to the second end and wraps around the outside of the second lead rod 1231, and the end of the second lead rod 1231 away from the pipe body 11 is exposed outside the insulating wrapping 1232.

[0090] In this embodiment, the connection structure of the second lead rod 1231 to the heating section 121 and the connection structure to the insulating plug 15 can refer to the connection method of the aforementioned first lead rod 122, which will not be elaborated here. One end of the second lead rod 1231 is connected to the heating section 121, and the other end extends out of the second end of the tube body 11 for electrically connecting to an external power supply. To prevent short circuits, insulating wrappings 1232 are respectively provided on each second lead rod 1231, and at the same time, the end of the second lead rod 1231 facing away from the tube body 11 is exposed outside the insulating wrapping 1232 to enable smooth wiring operation with the external power supply.

[0091] Optionally, the insulating wrapping 1232 can be a heat-shrinkable sleeve structure that wraps around the outer wall of the second lead rod 1231.

[0092] In some embodiments, an insulating spacer can also be added to the outer end of the insulating plug 15 at the second end of the tube body 11 to further ensure the insulation effect of the two second lead rods 1231. The insulating spacer can be adhesively fixed to the insulating plug 15, and the insulating spacer can be made of materials such as ceramics, glass, and polytetrafluoroethylene.

[0093] The present invention also proposes a dry heater, such as Figure 1 , Figure 7 and Figure 8 , which includes a heater sleeve 2, a mounting base 3, and a heating tube 1. The specific structure of the heating tube 1 refers to the above-mentioned embodiment. Since this dry heater adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Among them, one end of the heater sleeve 2 is closed, and the other end is open; the mounting base 3 is connected to the open end of the heater sleeve 2 and is open corresponding to the position of the heater sleeve 2; the heating tube 1 is arranged inside the heater sleeve 2, and the wiring end 123 of the heating tube 1 is arranged outside the heater sleeve 2.

[0094] In actual application, the closed end of the heater sleeve 2 extends into the inner tank 4 of the water heater, and the mounting base 3 is installed at the mouth 41 of the inner tank 4, so that the heater sleeve 2 can be fixed inside the inner tank 4. The heating tube 1 is installed inside the heater sleeve 2, and the water in the inner tank 4 is heated through the heater sleeve 2. If the dry heater fails, there is no need to disassemble the mounting base 3, nor to drain the water in the inner tank 4. The heating tube 1 can be directly removed from the heater sleeve 2, and the disassembly and installation are very simple.

[0095] In this embodiment, the tube body 11 of the heating tube 1 does not require processes such as folding and oil pressure, so the machining accuracy of the tube body 11 is higher. By using a multi-roller tube shrinking machine to process the outer diameter size of the heating tube, it can be controlled within the range of ±0.1 mm, greatly reducing the gap between the heating tube 1 and the inner wall size of the heater sleeve 2, ensuring that the heat of the heating tube 1 is transferred to the heater sleeve 2 in time and exchanging heat with water, and ensuring the service life of the heating tube 1.

[0096] The present invention also provides a water heater, which includes an inner tank 4 and a heating tube 1. The specific structure of the heating tube 1 refers to the above embodiment. Since this water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. The heating tube 1 is suitable for heating the water in the inner tank 4. In this embodiment, the heating tube 1 can directly heat the water in the inner tank 4, or can be installed in the inner tank 4 through other installation components for heating.

[0097] The present invention also provides a water heater, such as Figure 8 , which includes an inner tank 4 and a dry heater. The specific structure of the dry heater refers to the above embodiment. Since this water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. The closed end of the heater sleeve 2 extends into the inner tank 4, and the mounting seat 3 is fixed to the mouth 41 of the inner tank 4.

[0098] The inner tank 4 is provided with a water inlet pipe 51 and a water outlet pipe 52. The water inlet pipe 51 is used to supply cold water into the inner tank 4, and the water outlet pipe 52 is used to discharge hot water from the inner tank 4. The inner tank 4 is provided with a mouth 41. By fixing the mounting seat 3 at the mouth 41, the heater sleeve 2 is fixed inside the inner tank 4. The heating tube 1 is installed in the heater sleeve 2, and the water in the inner tank 4 is heated through the heater sleeve 2. When the heating tube 1 fails, it is not necessary to disassemble the mounting seat 3, nor to drain the water in the inner tank 4. The heating tube 1 can be directly removed, and the disassembly and installation are very simple.

[0099] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A heating tube, characterized in that: include: a tube body having opposite first and second ends; and The heating element comprises two heating sections arranged side by side in the tube body, the two heating sections are electrically connected at the first end, and the two heating sections are respectively provided with wiring terminals at the second end, and the two wiring terminals both extend out of the second end.

2. The heating tube according to claim 1, characterized in that: Each of the heating sections is provided with a first lead-out rod corresponding to the first end, and two of the first lead-out rods at least partially extend out of the first end and are electrically connected outside the first end.

3. The heating tube according to claim 2, characterized in that: The two first lead-out rods are welded and fixed; Alternatively, the heating tube further comprises an electrical connector provided outside the tube body, and the two first lead-out rods are electrically connected via the electrical connector; Alternatively, the two first lead-out rods are an integral bent part.

4. The heating tube according to claim 1, characterized in that: The heating element is a resistance wire, and the resistance wire is bent to form two heating sections; Alternatively, the heating section is a resistance wire, and the heating tube further comprises an electrical connector, and the electrical connector is used to conduct the two resistance wires.

5. The heating tube according to claim 2 or 3, characterized in that: The heating tube further comprises an insulating sleeve arranged at the first end, and the insulating sleeve is arranged outside the two first lead-out rods.

6. The heating tube according to claim 2 or 3, characterized in that: The heating tube also includes insulating plugs respectively arranged at the first end and the second end of the tube body, the two insulating plugs are sealed and connected to the tube opening of the tube body to form a sealed cavity, and the two ends of the heating element are respectively fixed to the two insulating plugs.

7. The heating tube according to claim 6, characterized in that: The insulating plug is provided with two spaced apart positioning holes, the two first lead-out rods are respectively passed through the two positioning holes located at the first end, and the two wiring terminals are respectively passed through the two positioning holes located at the second end; The positioning hole and the corresponding heating section are coaxially arranged.

8. The heating tube according to any one of claims 1 to 4, characterized in that: The two wiring terminals are arranged at an angle, and the distance between the two wiring terminals is gradually expanded in a direction away from the tube body.

9. The heating tube according to claim 8, characterized in that: The terminal comprises: A second lead-out rod, one end of which is connected to the corresponding heating section and the other end of which extends out of the second end of the tube body; and An insulating wrapping piece is connected to the second end and wrapped around the outside of the second lead-out rod, and one end of the second lead-out rod facing away from the tube body is exposed to the insulating wrapping piece.

10. The heating tube according to any one of claims 1 to 4, characterized in that: The tube body is filled with an insulating heat conductor, which isolates the two heating sections and isolates the heating element from the tube wall of the tube body; And / or, the tube body is an insulating heat-conducting member.

11. A dry heater, characterized in that: include: a heater sleeve having one end closed and the other end open; A mounting seat connected to an open end of the heater sleeve and opened corresponding to the position of the heater sleeve; as well as The heating tube according to any one of claims 1 to 10, wherein the heating tube is arranged in the heater sleeve, and the connection terminal of the heating tube is arranged outside the heater sleeve.

12. A water heater, characterized in that: The water heater comprises an inner tank and a heating tube according to any one of claims 1 to 10, wherein the heating tube is suitable for heating water in the inner tank; Alternatively, the water heater comprises the dry heater according to claim 11 and an inner tank, the closed end of the heater sleeve extends into the inner tank, and the mounting seat is fixed to the tank opening of the inner tank.

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