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, two heating pieces and an insulating sleeve, and the pipe body is provided with a first end and a second end which are opposite to each other; the two heating pieces are arranged in the pipe body side by side, the two heating pieces are electrically connected outside the first end, and the two heating pieces are respectively provided with a wiring end extending out of the second end; the insulating sleeve is arranged outside the first end and sleeves the parts, extending out of the first end, of the two heating pieces. According to the technical scheme, the machining process is simplified, mechanical damage to the pipe body and the heating piece is reduced, meanwhile, electric leakage caused by electric conduction of the heating piece and the heater sleeve can be avoided, and safety is improved.

Description

Technical Field

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

[0002] The dry heater is applied to a storage water heater as a heating element. The dry heater generally has a heating tube and a heater sleeve. The heater sleeve is fixed inside the inner tank, and the heating tube is placed into the heater sleeve. When the heating tube works, the heating tube is energized to convert electrical energy into heat energy, and heat exchange is carried out with the water in the inner tank through the heater sleeve, thereby heating the water in the inner tank.

[0003] For the heating tube of the existing dry heater, processes such as folding and oil pressure forming are required during processing. Since a heating wire is arranged in the heating tube and magnesium oxide powder is filled in the heating tube, during the folding and oil pressure forming processes, the external force extrudes the pipe 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 in advance during use. Summary of the Invention

[0004] The main object of the present invention is to propose 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 includes:

[0006] A tube body having opposite first and second ends;

[0007] Two heating elements arranged side by side in the tube body, the two heating elements being electrically connected outside the first end, and the two heating elements respectively having connection terminals extending out of the second end; and

[0008] An insulating sleeve arranged outside the first end and sleeving the parts of the two heating elements extending out of the first end.

[0009] In an embodiment of the present application, the insulating sleeve is provided with a receiving cavity and an opening communicating with the receiving cavity. The opening is opposite to the first end, and the two heating elements extend into the receiving cavity through the opening and are electrically connected in the receiving cavity.

[0010] In an embodiment of the present application, one end of the insulating sleeve provided with the opening is sleeved on the outer wall of the tube body, and the insulating sleeve is in interference fit or adhesively fixed with the outer wall of the tube body.

[0011] In an embodiment of the present application, one end of the insulating sleeve provided with the opening is butted against the end of the tube body; the insulating sleeve is fixed to the tube body through an adhesive member.

[0012] In an embodiment of the present application, the insulating sleeve has a tubular structure. The insulating sleeve is a straight tube, or one end of the insulating sleeve facing away from the tube body is provided with a reduced opening;

[0013] Or, the insulating sleeve has a box structure, and one end of the insulating sleeve facing away from the tube body is provided in a closed state.

[0014] In an embodiment of the present application, the peripheral wall of the insulating sleeve is provided with a hollow hole communicating with the accommodating cavity. The insulating sleeve is provided with two openings, and each opening correspondingly penetrates through one heating element;

[0015] The heating tube further includes an electrical connecting member, and the electrical connecting member can be installed in the accommodating cavity through the hollow hole to electrically connect the two heating elements.

[0016] In an embodiment of the present application, the insulating sleeve is a ceramic part, a glass part or a Teflon part.

[0017] In an embodiment of the present application, the heating element includes:

[0018] A heating section disposed inside the tube body;

[0019] A first lead rod, one end of which is connected to the heating section and the other end extends out of the first end; and

[0020] A second lead rod, one end of which is connected to the heating section and the other end extends out of the second end to form the wiring terminal;

[0021] Wherein, the two first lead rods are electrically connected outside the first end, and the insulating sleeve is sleeved outside the two first lead rods.

[0022] In an embodiment of the present application, the two first lead rods are fixed by welding;

[0023] Or, the two first lead rods are electrically conducted through an electrical connecting member;

[0024] Or, the two first lead rods are integrally bent and connected.

[0025] In an embodiment of the present application, the two wiring terminals are arranged at an included angle, and the distance between the two wiring terminals gradually increases in a direction away from the tube body;

[0026] An insulating wrapping member is provided outside the wiring terminal, and one end of the wiring terminal facing away from the tube body is exposed outside the insulating wrapping member.

[0027] 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 elements and isolates the heating elements from the tube wall of the tube body;

[0028] And / or, the pipe body is an insulating and heat-conducting member.

[0029] To achieve the above object, the present application further provides a dry heater, comprising:

[0030] A heater sleeve, one end of which is closed and the other end is open;

[0031] A mounting seat, connected to the open end of the heater sleeve and open corresponding to the position of the heater sleeve; and

[0032] The above-mentioned heating pipe, the heating pipe is arranged in the heater sleeve, and the wiring end of the heating pipe is arranged outside the heater sleeve.

[0033] To achieve the above object, the present application further provides a water heater, the water heater comprising an inner tank and the above-mentioned heating pipe, and the heating pipe is suitable for heating the water in the inner tank.

[0034] To achieve the above object, the present application further provides a water heater, the water heater comprising 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.

[0035] In the technical solution of the heating pipe of the present invention, two heating elements are arranged side by side in the pipe body. By electrically connecting the two heating elements outside the first end of the pipe body, the two heating elements respectively have wiring ends extending out of the second end at the second end of the pipe body for electrically connecting with a power source outside the pipe body, so as to realize the normal heating function of the two heating elements in the pipe body. In this embodiment, by extending the two wiring ends of the heating element from the same end of the pipe body, it is not necessary to perform a folding oil pressure operation on the pipe body, which simplifies the processing technology, reduces the mechanical damage to the pipe body and the heating element. At the same time, it is convenient to control the outer diameter of the pipe body, and the processing accuracy is high, greatly reducing the gap between the heating pipe and the inner wall of the heater sleeve, ensuring that the heat of the heating pipe can be transferred to the sleeve in time and perform heat exchange with water, and ensuring the service life of the heating pipe. In addition, by providing an insulating sleeve outside the first end of the pipe body, the insulating sleeve is sleeved outside the two heating elements to isolate the heating elements from the heater sleeve, avoiding electric conduction between the heating elements and the heater sleeve and causing electric leakage, and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order 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.

[0037] Figure 1 Structural schematic diagram of an embodiment of the heating tube provided by the present invention;

[0038] Figure 2 For Figure 1 Partial enlarged view at position A in

[0039] Figure 3 For Figure 1 Partial enlarged view at position B in

[0040] Figure 4 Structural schematic diagram of the cooperation between the insulating sleeve and the pipe body when the insulating sleeve is of a straight pipe structure in the embodiment of the present invention;

[0041] Figure 5 Structural schematic diagram of the cooperation between the insulating sleeve and the pipe body when the insulating sleeve is of a reduced - mouth pipe structure in the embodiment of the present invention;

[0042] Figure 6 Structural schematic diagram of the cooperation between the insulating sleeve and the pipe body when the insulating sleeve is of a box - body structure in the embodiment of the present invention;

[0043] Figure 7 Structural schematic diagram of the terminal at the second end of the pipe body in the present invention;

[0044] Figure 8 Structural schematic diagram of the heater sleeve and the mounting base in the embodiment of the present invention;

[0045] Figure 9 Structural schematic diagram of an embodiment of the water heater provided by the present invention.

[0046] Explanation of the reference numerals in the drawings:

[0047] Label Name Label Name 1 Heating tube 142 Accommodating cavity 11 Tube body 15 Insulating plug 12 Heating element 151 Positioning hole 121 Heating section 16 Insulating and heat-conducting material 122 First lead rod 17 Bonding part 123 Terminal 2 Heater sleeve 1231 Second lead rod 3 Mounting seat 1232 Insulating wrapping 4 Inner tank 13 Electrical connector 41 Tank opening 14 Insulating sleeve 51 Water inlet pipe 141 Opening 52 Water outlet pipe

[0048] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the 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 of 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.

[0050] 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 positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0051] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0052] The heating tube of the existing dry heater needs to be folded in half and hydraulically formed during the processing, and is processed from a long straight round tube into a long straight oval tube after being folded in half. Since the heating tube is provided with a heating wire and is filled with magnesium oxide powder, during the hydraulic forming process, the external force squeezes the tube and the magnesium oxide powder in the heating tube, causing mechanical damage to the resistance wire in the heating tube, which is easy to cause the resistance wire to be damaged prematurely during use. The existing technology has the problem of complex heating tube processing technology and easy wire breakage of the resistance wire. In addition, the related technology also has the problem of leakage caused by electrical conduction between the heating tube and the heater sleeve.

[0053] Based on this, the present invention proposes a heating tube 1, which is designed to simplify the processing technology and reduce the risk of wire breakage without bending the electric heating tube as a whole. At the same time, when the heating tube 1 is applied to the heater sleeve 2, the isolation and insulation between the heating tube 1 and the heater sleeve 2 can be ensured to avoid electrical conduction. The structure of the heating tube 1 is described below in the form of an embodiment.

[0054] See also Figures 1 to 6 In the embodiment of the present invention, the heating tube 1 includes a tube body 11 , two heating elements 12 and an insulating sleeve 14 .

[0055] The tube body 11 has a first end and a second end opposite to each other; two heating elements 12 are arranged side by side in the tube body 11, the two heating elements 12 are electrically connected outside the first end, and the two heating elements 12 respectively have a wiring terminal 123 extending from the second end; the insulating sleeve 14 is arranged outside the first end and is sleeved on the parts of the two heating elements 12 extending from the first end.

[0056] In this embodiment, the tube body 11 functions to mount the heating element 12 and conduct the heat of the heating element 12. It can be understood that the tube body 11 and the heating element 12 are insulated from each other to prevent electric leakage caused by the heating element 12 and the tube body 11 being conductive. 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. In practical applications, the tube body 11 can be set as a circular tube that is easy to form.

[0057] Two heating elements 12 are arranged side by side in the tube body 11. It can be understood that the two heating elements 12 are arranged parallel to each other at intervals in the tube body 11. The heating element 12 can be a structure that only includes a resistance wire with a high heating efficiency. In this case, the whole heating element 12 is a resistance wire structure; or it can also include a resistance wire and other conductive structures. In this case, lead bar structures or wire structures, etc. can be respectively arranged at both ends of the resistance wire.

[0058] The two heating elements 12 are electrically connected outside the first end. It can be understood that the electrical connection position of the two heating elements 12 is outside the tube body 11, which is more convenient for electrical connection operations and improves the assembly efficiency. The two heating elements 12 are respectively provided with connection terminals 123 at the second end of the tube body 11. The two connection terminals 123 are respectively a positive connection terminal and a negative connection terminal, which are used to extend out of the second end of the tube body 11 and be electrically connected to an external power source to realize the energization and heating of the two heating elements 12. It can be seen from this that the connection terminals 123 of the two heating elements 12 both extend out from the same end of the tube body 11, without the need for folding and oil pressure operation on the tube body 11, simplifying the process and reducing the mechanical damage to the tube body 11 and the resistance wire. The specific structure of the connection terminal 123 can be determined according to the actual situation. For example, it can be a lead bar 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 element 12 and the external power source, and its specific structure is not limited here.

[0059] The insulating sleeve 14 is arranged outside the first end and sleeved outside the two heating elements 12. 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 for use. Since the two heating elements 12 are electrically connected outside the tube body 11, in order to avoid electric leakage caused by the electrical conduction between the heating element 12 and the heater sleeve 2, 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 heating elements 12 to isolate the heating element 12 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. It should be noted that when the heating tube 1 is electrified 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 and glass, or can be a chemical substance such as polyimide and its similar molecular structure, or polyphenylene sulfide, polyether ketone and its similar molecular structure, or polytetrafluoroethylene and its similar molecular structure.

[0060] 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 its thermal conductivity. In the related art, in order to enable 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 heating wire to overheat and burn out. In this embodiment, since there is no need to bend the heating tube 1 as a whole, 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 further, the dry burning and overheating of the heating wire can be prevented, and the occurrence of faults can be reduced.

[0061] In summary, in the heating tube 1 of the technical solution of the present invention, two heating elements 12 are arranged side by side in the tube body 11. By electrically connecting the two heating elements 12 outside the first end of the tube body 11, the two heating elements 12 respectively have connection terminals 123 extending out of the second end at the second end of the tube body 11 for electrically connecting to a power source outside the tube body 11, so as to realize the normal heating function of the two heating elements 12 in the tube body 11. In this embodiment, by extending the two connection terminals 123 of the heating element 12 from the same end of the tube body 11, it is not necessary to perform a folding oil pressure operation on the tube body 11, which simplifies the processing technology, reduces mechanical damage to the tube body 11 and the heating element 12. At the same time, it is convenient to control the outer diameter of the tube body 11, with high processing accuracy, greatly reducing the gap between the heating tube 1 and the inner wall of the heater sleeve 2, ensuring that the heat of the heating tube 1 can be transferred to the sleeve in time for heat exchange with water, and ensuring the service life of the heating tube 1. In addition, by providing an insulating sleeve 14 outside the first end of the tube body 11, the insulating sleeve 14 is sleeved outside the two heating elements 12 to isolate the heating elements 12 from the heater sleeve 2, avoiding electric conduction between the heating elements 12 and the heater sleeve 2 and causing electric leakage, thereby improving safety.

[0062] In an embodiment of the present application, as Figure 2 and Figures 4 to 6 , the insulating sleeve 14 is provided with a receiving cavity 142 and an opening 141 communicating with the receiving cavity 142. The opening 141 faces the first end. The two heating elements 12 extend into the receiving cavity 142 through the opening 141 and are electrically connected in the receiving cavity 142.

[0063] In this embodiment, the insulating sleeve 14 is provided with an opening 141 for the two heating elements 12 to pass through, so that after the heating elements 12 extend out of the first end of the tube body 11, they can smoothly extend into the receiving cavity 142 and be wrapped and isolated by the insulating sleeve 14 to prevent electric conduction between the heating elements 12 and an external conductor such as the heater sleeve 2 and cause electric leakage problems. Optionally, the insulating sleeve 14 can completely wrap the parts of the two heating elements 12 outside the first end, or can partially wrap the parts of the two heating elements 12 outside the first end.

[0064] It can be understood that the connection structure between the insulating sleeve 14 and the tube body 11 can be determined according to actual situations.

[0065] As an example, as Figure 4 and Figure 5 , one end of the insulating sleeve 14 provided with the opening 141 is sleeved on the outer wall of the tube body 11, and the insulating sleeve 14 is in interference fit or adhesively fixed with the outer wall of the tube body 11. In this way, it only needs to sleeve the insulating sleeve 14 on the tube body 11, with simple operation and high assembly efficiency.

[0066] As an example, as Figure 6, one end of the insulating sleeve 14 having an opening 141 is connected to the end of the tube body 11, and the insulating sleeve 14 is fixed to the tube body 11 by a bonding member 17. Optionally, the bonding member 17 is a high temperature resistant glue. In this way, the outer peripheral wall of the insulating sleeve 14 can be aligned with the outer peripheral wall of the tube body 11, which can ensure the overall appearance integrity of the heating tube 1 on the one hand, and on the other hand, the outer peripheral wall of the insulating sleeve 14 does not protrude from the outer wall of the tube body 11, which can make it easier for the heating tube 1 to be inserted into the heater sleeve 2, and at the same time can reduce the gap between the heating tube 1 and the heater sleeve 2, thereby improving the heat transfer efficiency.

[0067] Furthermore, the specific structure of the insulating sleeve 14 can be determined according to actual conditions.

[0068] As an example, Figure 4 and Figure 5 , the insulating sleeve 14 is a tubular structure. In this embodiment, the insulating sleeve 14 can be a straight tube (such as Figure 4 ), or, the end of the insulating sleeve 14 away from the tube body 11 is configured to be constricted (such as Figure 5 ). 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 of the cylindrical structure in this embodiment are open, and the heat generated by the heating element 12 located inside the insulating sleeve 14 can be output to the outside through the opening of the insulating sleeve 14, thereby further improving the heating efficiency of the heating tube 1.

[0069] As an example, Figure 6 The insulating sleeve 14 is a box structure, and the end of the insulating sleeve 14 away from the tube body 11 is closed. It can be understood that the insulating sleeve 14 can fully or partially wrap the heating element 12 extending outside the tube body 11, and the insulating sleeve 14 can be made of materials such as ceramic beads, glass beads or Teflon beads.

[0070] When the insulating sleeve 14 is fully wrapped, Figure 6 (e) and Figure 6 (f), the insulating sleeve 14 is connected to the first end of the tube body 11 to form a relatively closed cavity, and the heating element 12 (the first lead rod 122 and the electrical connector 13) outside the tube body 11 is more tightly wrapped, further improving the electrical isolation effect. In this way, the two first lead rods 122 need to be electrically connected or electrically connected through the electrical connector 13 before installing the insulating sleeve 14.

[0071] When the insulating sleeve 14 is partially wrapped, such as Figure 6(g), a hollow hole (not shown in the figure) communicating with the accommodation cavity 142 may be provided on the peripheral wall of the insulating sleeve 14. The insulating sleeve 14 is provided with two openings 141, and each opening 141 is correspondingly penetrated by a heating element 12; the heating tube 1 further includes an electrical connector 13, and the electrical connector 13 can be installed in the accommodation cavity 142 through the hollow hole to electrically connect the two heating elements 12. In this embodiment, while the insulating sleeve 14 protects the heating element 12 part (the first lead-out rod 122, the electrical connector 13) outside the tube body 11, it can quickly transfer heat. In actual application, the two first lead-out rods 122 can extend into the accommodation cavity 142 from the two openings 141, and then the electrical connector 13 is placed into the insulating sleeve 14 through the hollow hole and welded to the two first lead-out rods 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-out rod 122, without the need to additionally provide a special fixing structure to fix the insulating sleeve 14, further simplifying the assembly process.

[0072] In an embodiment of the present application, as Figures 1 to 3 , the heating element 12 includes a heating section 121, a first lead-out rod 122, and a second lead-out rod 1231. The heating section 121 is arranged inside the tube body 11; one end of the first lead-out rod 122 is connected to the heating section 121, and the other end extends out of the first end; one end of the second lead-out rod 1231 is connected to the heating section 121, and the other end extends out of the second end to form a wiring terminal 123; wherein, the two first lead-out rods 122 are electrically connected outside the first end, and the insulating sleeve 14 is sleeved outside the two first lead-out rods 122.

[0073] 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-out rod 122 at one end of each heating section 121 and realizing electrical conduction of the two heating sections 121 through electrical connection of the two first lead-out rods 122, 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 material 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, and thus the two ends of the resistance wire may contact 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.

[0074] In practical applications, the first lead rod 122 can be a conductive rod, a wire, a conductive sheet, or other conductive structures, etc. The first lead rod 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 rod 122 has a connection end. In the direction from the middle of the first lead rod 122 to the connection end, the cross-sectional area of the first lead rod 122 gradually decreases, so that the connection end forms a cone, which is beneficial for the spiral resistance wire to be sleeved on the connection end, increasing the contact area between the first lead rod 122 and the resistance wire and ensuring the electrical connection between the first lead rod 122 and the resistance wire.

[0075] The heating section 121 is provided with a second lead rod 1231 at the second end. The second lead rod 1231 extends out of the second end of the tube body 11 for electrical connection with an external power supply. The connection structure between the second lead rod 1231 and the heating section 121 can refer to the connection structure between the first lead rod 122 and the heating section 121, which will not be elaborated here.

[0076] The insulating sleeve 14 is sleeved outside the two first lead rods 122 to ensure that the parts of the two first lead rods 122 located outside the tube body 11 can be within the accommodation cavity 142 of the insulating sleeve 14, preventing electrical conduction with external conductors such as the heater sleeve 2 and causing leakage problems.

[0077] Furthermore, the electrical connection method of the two first lead rods 122 can be determined according to the actual situation.

[0078] In an embodiment of the present application, as Figure 4 (a), Figure 5 (c), and Figure 6 (e), the two first lead rods 122 are welded and fixed. It can be understood that considering that the ends of the two first lead rods 122 connected to the heating section 121 are spaced apart, the ends of the two first lead rods 122 away from the heating section 121 can be bent towards each other so that the two first lead rods 121 are in contact, and then fixed by welding. Optionally, resistance welding or argon arc welding, etc. can be used.

[0079] In an embodiment of the present application, as Figure 4 (b), Figure 5 (d), Figure 6 (f), and Figure 6(g), the 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.

[0080] 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.

[0081] 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.

[0082] In one embodiment of the present application, Figure 1 The tube body 11 is filled with an insulating heat conductor 16 , which isolates the two heating elements 12 and the heating elements 12 from the tube wall of the tube body 11 .

[0083] The insulating heat conductor 16 can transfer the heat of the heating element 12 to the tube wall of the tube body 11, which is conducive to the transfer of heat of the heating element 12; furthermore, the insulating heat conductor 16 can isolate the two heating elements 12 to prevent the two heating elements 12 from contacting each other and causing safety hazards. At the same time, the insulating heat conductor 16 can isolate the heating element 12 and the inner wall of the tube body 11 to prevent the heating element 12 from contacting the inner wall of the tube body 11 and causing the risk of leakage. Generally, the insulating heat conductor 16 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 11 in time, playing the role of insulation and heat conduction. Powdered magnesium oxide powder can form a stable support structure inside the heating tube, so that the heating element 12 of the heating tube 1 is well fixed and supported. This helps to maintain the relative position between the two heating elements 12 and prevent accidental damage to the heating section 121 due to vibration or displacement.

[0084] 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 the need for 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 out in time, reducing the influence of the high-temperature environment on the resistance wire and ensuring the service life of the resistance wire.

[0085] 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, thus ensuring safety.

[0086] In an 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 tube 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.

[0087] 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 tube orifices, preventing the insulating heat-conducting material 16 from getting damp 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.

[0088] Furthermore, the insulating plug 15 is provided with two spaced-apart positioning holes 151. The two first lead-out rods 122 respectively pass through the two positioning holes 151 at the first end, and the two second lead-out rods 1231 respectively pass through the two positioning holes 151 at the second end.

[0089] It can be understood that the two positioning holes 151 at the first end are used to fix the two first lead-out rods 122, and the two positioning holes 151 at the second end are used to fix the two second lead-out rods 1231, so as to be able to position the two heating sections 121, prevent the two heating sections 121 from displacing, 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 prevent the two heating sections 121 from contacting each other to cause potential safety hazards.

[0090] Further, the positioning holes 151 and the corresponding heating sections 121 are coaxially arranged. Optionally, the two positioning holes 151 are arranged in parallel, such that the two heating sections 121 are arranged parallel and opposite to each other, preventing the two heating sections 121 from coming into contact with each other.

[0091] Optionally, an interference fit may be provided between the positioning holes 151 and the first lead rods 122, and between the positioning holes 151 and the connection terminals 123, so as to enhance the sealing performance of the tube body 11 and prevent the insulating and heat-conducting material 16 from being affected by moisture.

[0092] In this embodiment, both ends of the tube body 11 are open, facilitating the filling of the insulating and heat-conducting material 16; the insulating plugs 15 provided at both ends of the tube body 11 can fix both ends of the heating element 12, thereby ensuring the relative positions of the two heating elements 12 and the tube body 11, preventing the heating element 12 from contacting the inner wall of the tube body 11 and causing electric leakage, and the insulating plugs 15 play a supporting role for the heating sections 121.

[0093] In an embodiment of the present application, as Figure 7 , 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 tube body 11.

[0094] The two connection terminals 123 extend out of the second end of the tube body 11 for electrical connection to an external power source. It can be understood that one of the two connection terminals 123 is the positive electrode and the other is the negative electrode. To ensure wiring safety, the creepage distance between the two connection terminals 123 needs to be increased 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 tube 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.

[0095] Exemplarily, an insulating wrapping 1232 is provided outside the connection terminal 123, and one end of the connection terminal 123 away from the tube body 11 is exposed outside the insulating wrapping 1232.

[0096] It can be understood that 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 to form the connection terminal 123 for electrical connection to an external power source. To prevent short circuits, insulating wrappings 1232 are respectively provided on each of the second lead rods 1231, and at the same time, one end of the second lead rod 1231 away from the tube body 11 is exposed outside the insulating wrapping 1232 to enable smooth wiring operation with an external power source.

[0097] Optionally, the insulating wrapping 1232 may be a heat-shrinkable sleeve structure wrapped around the outer wall of the second lead rod 1231.

[0098] In some embodiments, an insulating spacer can be additionally provided at 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.

[0099] The present invention also provides a dry heater, such as Figure 1 , Figure 8 and Figure 9 , 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 embodiments. Since this dry 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. 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.

[0100] In practical applications, 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.

[0101] 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 can be transferred to the heater sleeve 2 in time and exchanging heat with water, and ensuring the service life of the heating tube 1. At the same time, an insulating sleeve 14 is provided in the heating tube 1 to isolate the heating element 12 from the heater sleeve 2, preventing the heating element 12 from being electrically conducted to the heater sleeve 2 and improving safety.

[0102] 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 embodiments. 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 mounting components for heating.

[0103] The present invention also provides a water heater, such as Figure 9 , which includes an inner tank 4 and a dry heater. For the specific structure of the dry heater, reference may be made to the above embodiments. 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.

[0104] 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 introduce 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 pipe 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 pipe 1 fails, it is not necessary to disassemble the mounting seat 3, nor to drain the water in the inner tank 4. The heating pipe 1 can be directly removed, and the disassembly and installation are very simple.

[0105] The above is only an exemplary embodiment of the present invention, and does 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 any direct / indirect application in 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; Two heating elements are arranged side by side in the tube body, the two heating elements are electrically connected to the outside of the first end, and the two heating elements respectively have a connection terminal extending out of the second end; as well as The insulating sleeve is arranged outside the first end and sleeved on the parts of the two heating elements extending out of the first end.

2. The heating tube according to claim 1, characterized in that: The insulating sleeve is provided with a receiving cavity and an opening communicating with the receiving cavity, wherein the opening is opposite to the first end, and the two heating elements extend into the receiving cavity through the opening and are electrically connected in the receiving cavity.

3. The heating tube according to claim 2, characterized in that: One end of the insulating sleeve with the opening is sleeved on the outer wall of the tube body, and the insulating sleeve is interference fit with the outer wall of the tube body or is fixed by bonding.

4. The heating tube according to claim 2, characterized in that: One end of the insulating sleeve where the opening is arranged is butted against the end of the tube body; the insulating sleeve is fixed to the tube body via an adhesive joint.

5. The heating tube according to any one of claims 2 to 4, characterized in that: The insulating sleeve is a tube structure, the insulating sleeve is a straight tube, or the end of the insulating sleeve away from the tube body is configured to be constricted; Alternatively, the insulating sleeve is a box structure, and one end of the insulating sleeve away from the tube body is arranged in a closed shape.

6. The heating tube according to claim 5, characterized in that: The insulating sleeve has a hollow hole in communication with the accommodating cavity on its peripheral wall, and the insulating sleeve has two openings, each of which has a corresponding heating element. The heating tube further comprises an electrical connector, which can be installed in the accommodating cavity through the hollow hole to electrically connect the two heating elements.

7. The heating tube according to any one of claims 1 to 4, characterized in that: The insulating sleeve is a ceramic piece, a glass piece or a Teflon piece.

8. The heating tube according to any one of claims 1 to 4, characterized in that: The heating element comprises: A heating section is arranged in the tube body; A first lead-out rod, one end of which is connected to the heating section and the other end of which extends out of the first end; and A second lead-out rod, one end of which is connected to the heating section and the other end of which extends out of the second end to form the wiring terminal; The two first lead-out rods are electrically connected outside the first end, and the insulating sleeve is arranged outside the two first lead-out rods.

9. The heating tube according to claim 8, characterized in that: The two first lead-out rods are welded and fixed; Or, the two first lead-out bars are electrically connected via an electrical connector; Alternatively, the two first lead-out rods are integrally bent and connected.

10. 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; An insulating wrapping piece is arranged outside the wiring terminal, and one end of the wiring terminal facing away from the tube body is exposed outside the insulating wrapping piece.

11. 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 elements and isolates the heating element from the tube wall of the tube body; And / or, the tube body is an insulating heat-conducting member.

12. 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 11, wherein the heating tube is arranged in the heater sleeve, and the connection terminal of the heating tube is arranged outside the heater sleeve.

13. A water heater, characterized in that: The water heater comprises an inner tank and a heating tube as claimed in any one of claims 1 to 11, wherein the heating tube is suitable for heating water in the inner tank; Alternatively, the water heater comprises the dry heater according to claim 12 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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