Heating tube, dry-type heater, and water heater

Abstract

The present application discloses a heating tube, a dry-type heater, and a water heater. The heating tube comprises a tube body, two heating members, and an insulating sleeve; the tube body has a first end and a second end which are opposite to each other; the two heating members are arranged in the tube body side by side; the two heating members are electrically connected at the exterior of the first end; the two heating members are each provided with a wiring end extending out of the second end; and the insulating sleeve is provided on the exterior of the first end and sleeved on the part of the two heating members extending out of the first end.

Description

Heating tubes, dry heaters and water heaters

[0001] Related applications

[0002] This application claims priority to Chinese patent applications with application numbers 202410498882.2 and 202410498877.1 filed on April 24, 2024, and with application number 202323615740.X filed on December 28, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of water heaters, and in particular to a heating tube, a dry heater and a water heater. Background Art

[0004] Dry-type heaters are used as heating elements in storage-type electric water heaters. Dry-type heaters typically consist of a heating tube and a heater sleeve, which is secured to the inner tank. When the heater sleeve is in operation, it converts electrical energy into heat, which is then transferred through the heater sleeve to the water in the tank, heating it.

[0005] Summary of the Invention

[0006] The main purpose of this application is to propose a heating tube, a dry heater and a water heater, aiming to simplify processing and reduce the risk of wire breakage.

[0007] To achieve the above-mentioned purpose, the heating tube proposed in the present application includes a tube body, two heating elements and an insulating sleeve.

[0008] In one embodiment of the present application, the tube has a first end and a second end opposite to each other;

[0009] In one embodiment of the present application, 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 terminal extending out of the second end; and

[0010] In one embodiment of the present application, an insulating sleeve is disposed on the outside of the first end and covers the portions of the two heating elements extending out of the first end.

[0011] In one embodiment of the present application, the insulating sleeve is provided with a accommodating cavity and an opening connected to the accommodating cavity, the opening is opposite to the first end, the two heating elements extend into the accommodating cavity through the opening and are electrically connected in the accommodating cavity.

[0012] In one 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 interference fit with the outer wall of the tube body or is fixed by bonding.

[0013] In one embodiment of the present application, one end of the insulating sleeve provided with the opening is connected to the end of the tube body; and the insulating sleeve is fixed to the tube body by an adhesive member.

[0014] In one embodiment of the present application, the insulating sleeve is a tubular 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.

[0015] In one embodiment of the present application, the insulating sleeve is a box structure, and one end of the insulating sleeve facing away from the tube body is arranged in a closed shape.

[0016] In one embodiment of the present application, a hollow hole communicating with the accommodating cavity is provided on the peripheral wall of the insulating sleeve, and the insulating sleeve is provided with two openings, and each opening corresponds to a heating element.

[0017] In one embodiment of the present application, the heating tube further includes an electrical connector, which can be installed in the accommodating cavity through the hollow hole to electrically connect the two heating elements.

[0018] In one embodiment of the present application, the heating element is a resistance wire, and the resistance wire is bent to form two heating sections.

[0019] In one embodiment of the present application, the insulating sleeve is a ceramic part, a glass part or a Teflon part.

[0020] In one embodiment of the present application, the heating element includes a heating section, a first lead-out rod and a second lead-out rod.

[0021] In one embodiment of the present application, the heating section is disposed in the tube body.

[0022] In one embodiment of the present application, one end of the first lead-out rod is connected to the heating section, and the other end extends out of the first end.

[0023] In one embodiment of the present application, one end of the second lead-out rod is connected to the heating section, and the other end extends out of the second end to form the connection terminal.

[0024] In one embodiment of the present application, the two first lead-out rods are electrically connected outside the first end, and the insulating sleeve is provided outside the two first lead-out rods.

[0025] In one embodiment of the present application, the heating tube further includes insulating plugs respectively arranged at the first end and the second end of the tube body, the two insulating plugs are sealedly connected to the tube mouth 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.

[0026] In one embodiment of the present application, the insulating plug is provided with two spaced-apart positioning holes, the two first lead-out rods respectively pass through the two positioning holes located at the first end, and the two terminal terminals respectively pass through the two positioning holes located at the second end.

[0027] In one embodiment of the present application, the positioning hole and the corresponding heating section are coaxially arranged.

[0028] In one embodiment of the present application, the two first lead-out bars are fixed by welding.

[0029] In one embodiment of the present application, the two first lead-out bars are electrically connected via an electrical connector.

[0030] In one embodiment of the present application, the two first lead-out bars are integrally bent and connected.

[0031] In one embodiment of the present application, 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.

[0032] In one embodiment of the present application, an insulating wrapping member is provided on the outside of the wiring terminal, and an end of the wiring terminal facing away from the tube body is exposed from the insulating wrapping member.

[0033] In one embodiment of the present application, the tube body is filled with an insulating heat conductor, which isolates the two heating elements and isolates the heating elements from the tube wall of the tube body.

[0034] In one embodiment of the present application, the tube body is an insulating heat conductive member.

[0035] To achieve the above objectives, the present application also provides a dry heater, including a heater sleeve, a mounting base and the above heating tube.

[0036] In one embodiment of the present application, one end of the heater sleeve is closed and the other end is open.

[0037] In one embodiment of the present application, the mounting seat is connected to an open end of the heater sleeve and is opened corresponding to the position of the heater sleeve.

[0038] In one embodiment of the present application, the heating tube is disposed inside the heater sleeve, and the connection end of the heating tube is disposed outside the heater sleeve.

[0039] To achieve the above-mentioned purpose, the present application also provides a water heater, which includes an inner tank and the above-mentioned heating tube, and the heating tube is suitable for heating the water in the inner tank.

[0040] To achieve the above objectives, the present application also 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 base is fixed to the tank opening of the inner tank.

[0041] In the heating tube of the present application, two heating elements are arranged side by side within the tube body. The two heating elements are electrically connected externally at the first end of the tube body. Each heating element has a terminal extending from the second end of the tube body for electrical connection to an external power source, thereby achieving normal heating function within the tube body. By extending both terminal ends of the heating elements from the same end of the tube body, this embodiment eliminates the need for hydraulic folding of the tube body, simplifies the manufacturing process, and reduces mechanical damage to the tube body and the heating elements. Furthermore, the outer diameter of the tube body is easily controlled, resulting in high machining precision and a significantly reduced gap between the heating tube and the inner wall of the heater sleeve. This ensures that heat from the heating tube is promptly transferred to the sleeve and heat exchanged with water, thereby ensuring the life of the heating tube. Furthermore, an insulating sleeve is provided externally at the first end of the tube body, extending over the exterior of the two heating elements to isolate the heating elements from the heater sleeve, preventing electrical leakage caused by electrical conduction between the heating elements and the heater sleeve and improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0043] FIG1 is a schematic structural diagram of an embodiment of a heating tube provided by the present application;

[0044] FIG2 is a partial enlarged view of point A in FIG1 ;

[0045] FIG3 is a partial enlarged view of point B in FIG1 ;

[0046] FIG4 is a schematic diagram of the structure of the insulating sleeve in cooperation with the pipe body when the insulating sleeve is a straight pipe structure in an embodiment of the present application;

[0047] FIG5 is a schematic diagram of the structure of the insulating sleeve in cooperation with the tube body when the insulating sleeve is a necked tube structure in an embodiment of the present application;

[0048] FIG6 is a schematic diagram of the structure of the insulating sleeve in cooperation with the tube body when the insulating sleeve is a box structure in an embodiment of the present application;

[0049] FIG7 is a schematic structural diagram of the connection terminal at the second end of the tube body in the present application;

[0050] FIG8 is a schematic structural diagram of a heater sleeve and a mounting base according to an embodiment of the present application;

[0051] FIG9 is a schematic structural diagram of an embodiment of a water heater provided in this application.

[0052] Description of Figure Numbers:

[0053] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0054] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0055] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0056] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0057] The heating tubes of existing dry-type heaters undergo processes such as folding and hydraulic forming during processing. Because the heating tubes are equipped with heating wires and filled with magnesium oxide powder, external forces compressing the tube material and the magnesium oxide powder inside during the folding and hydraulic forming process can mechanically damage the resistance wires, potentially causing premature damage during use.

[0058] The heating tube of existing dry-type heaters requires folding and hydraulic forming during the manufacturing process, transforming a long, straight, round tube into a folded, long, straight, oval tube. Because the heating tube is equipped with a heating wire and filled with magnesium oxide powder, the external force squeezes the tube and the magnesium oxide powder inside during the hydraulic forming process, causing mechanical damage to the resistance wire inside the heating tube, which can easily cause premature damage during use. The existing technology has problems with the complex manufacturing process for the heating tube and the resistance wire being prone to breakage. Furthermore, the related art also has the problem of leakage caused by electrical conduction between the heating tube and the heater sleeve.

[0059] Based on this, the present application proposes a heating tube 1 that eliminates the need for integral bending of the electric heating tube, simplifies the manufacturing process, and reduces the risk of wire breakage. Furthermore, when the heating tube 1 is incorporated into a heater sleeve 2, it ensures isolation and insulation between the heating tube 1 and the heater sleeve 2, preventing electrical conduction. The structure of the heating tube 1 is described below using an example.

[0060] Please refer to FIG. 1 to FIG. 6 . In the embodiment of the present application, the heating tube 1 includes a tube body 11 , two heating elements 12 and an insulating sleeve 14 .

[0061] 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, and the two heating elements 12 are electrically connected outside the first end. The two heating elements 12 respectively have a 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.

[0062] In this embodiment, the tube body 11 serves to install 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 to prevent the heating element 12 and the tube body 11 from conducting electricity and causing leakage problems. At the same time, the tube body 11 can quickly conduct the heat inside it to the outside. In one embodiment, the tube body 11 can be a metal tube or a non-metallic tube with good thermal conductivity. The tube body 11 itself can be an insulating material or a non-insulating material. When it is a non-insulating material, it can be isolated and insulated from the heating element 12 by filling the inside of the tube body 11 with insulating material. In one embodiment, the cross-sectional shape of the tube body 11 can be circular, semicircular, square, triangular or other special shapes. In actual application, the tube body 11 can be set as a circular tube that is easy to shape.

[0063] The two heating elements 12 are arranged side by side in the tube body 11. It is understood that the two heating elements 12 are arranged in parallel with each other in the tube body 11. The heating element 12 can be a structure that only includes a resistance wire with high heating efficiency, in which case the heating element 12 is a resistance wire structure; or it can include a resistance wire and other conductive structures, in which case lead rod structures or wire structures can be provided at both ends of the resistance wire.

[0064] The two heating elements 12 are electrically connected to the outside of the first end. It is understandable that the electrical connection position of the two heating elements 12 is outside the tube body 11, which can make the electrical connection operation more convenient and improve the assembly efficiency. The two heating elements 12 are respectively provided with a terminal 123 at the second end of the tube body 11. The two terminals 123 are respectively a positive terminal and a negative terminal, which are used to extend from the second end of the tube body 11 and electrically connect to the external power supply to realize the power supply and heating of the two heating elements 12. It can be seen that the terminals 123 of the two heating elements 12 are both extended from the same end of the tube body 11, and there is no need to fold the tube body 11 in half and perform an oil pressure operation, which simplifies the process and reduces the mechanical damage to the tube body 11 and the resistance wire. The specific structure of the terminal 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 structure. As long as it can ensure that the heating element 12 is electrically connected to the external power supply, its specific structure is not limited here.

[0065] An insulating sleeve 14 is disposed on the outside of the first end and is mounted on the outside of the two heating elements 12. It is understood that when the heating tube 1 is used in a dry-type heater, the heating tube 1 is placed in the heater sleeve 2. Since the two heating elements 12 are electrically connected on the outside of the tube body 11, to prevent leakage caused by electrical conduction between the heating elements 12 and the heater sleeve 2, this embodiment provides an insulating sleeve 14 at the first end of the tube body 11 and mounts it on the outside of the two heating elements 12 to isolate the heating elements 12 from the heater sleeve 2, thereby improving 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 in the heater sleeve 2. It should be noted that because the temperature inside the heater sleeve 2 is high when the heating tube 1 is powered on, reaching a high temperature of 300°C to 400°C, the insulating sleeve 14 must not deform or change shape under long-term high-temperature conditions, maintaining good insulation performance. In one embodiment, the insulating sleeve 14 can be made of a high-temperature resistant heat shrinkable sleeve, a glass fiber insulating sleeve, or ceramics, glass and other materials. It can also be polyimide and chemical substances with similar molecular structures, or polyphenylene sulfide, polyether ketone and chemical substances with similar molecular structures, or polytetrafluoroethylene and chemical substances with similar molecular structures.

[0066] In actual application, the tube body 11 is filled with magnesium oxide powder with good thermal conductivity. The compactness of magnesium oxide powder is related to thermal conductivity. In the related art, in order to realize the overall folding and extrusion of the heating tube 1, the magnesium oxide powder filled inside needs to be in a loose state. The heat transfer efficiency of loose magnesium oxide powder is poor, which will cause the internal heating wire to overheat and dry burn and break. In this embodiment, there is no need to bend the heating tube 1 as a whole, so there is no need to reduce the compactness of the magnesium oxide powder. In this way, the compactness of the magnesium oxide powder can be guaranteed, the thermal conductivity efficiency can be improved, and the heating wire can be prevented from overheating and dry burning, thereby reducing the occurrence of malfunctions.

[0067] In summary, in the technical solution of the present application, in the heating tube 1, 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 a terminal 123 extending from the second end at the second end of the tube body 11 for electrically connecting to a power source outside the tube body 11, thereby realizing the normal heating function of the two heating elements 12 in the tube body 11. In this embodiment, by extending both terminal 123 of the heating element 12 from the same end of the tube body 11, there is no need to perform an oil pressure operation on the tube body 11, which simplifies the processing technology and 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 precision, and greatly reduces the gap between the heating tube 1 and the inner wall of the heater sleeve 2, which can ensure that the heat of the heating tube 1 is transferred to the sleeve in a timely manner and heat exchanged with the water, thereby ensuring the life of the heating tube 1. In addition, an insulating sleeve 14 is provided on the outside of the first end of the tube body 11, and the insulating sleeve 14 is sleeved on the outside of the two heating elements 12 to isolate the heating elements 12 from the heater sleeve 2, thereby avoiding electrical conduction between the heating elements 12 and the heater sleeve 2 and causing leakage, thereby improving safety.

[0068] In one embodiment of the present application, as shown in Figures 2 and 4 to 6, the insulating sleeve 14 is provided with a accommodating cavity 142 and an opening 141 communicating with the accommodating cavity 142, the opening 141 is opposite to the first end, and the two heating elements 12 extend into the accommodating cavity 142 through the opening 141 and are electrically connected in the accommodating cavity 142.

[0069] In this embodiment, the insulating sleeve 14 is provided with openings 141 for the two heating elements 12 to pass through. This allows the heating elements 12 to extend smoothly from the first end of the tube body 11 into the accommodating cavity 142, where they are enclosed and isolated by the insulating sleeve 14 to prevent electrical conduction between the heating elements 12 and external conductors, such as the heater sleeve 2, which could cause leakage. In one embodiment, the insulating sleeve 14 may fully or partially enclose the portions of the two heating elements 12 located outside the first end.

[0070] The connection structure between the insulating sleeve 14 and the tube body 11 can be determined according to actual conditions.

[0071] As an example, as shown in Figures 4 and 5, one end of the insulating sleeve 14 with the opening 141 is sleeved onto the outer wall of the tube body 11. The insulating sleeve 14 is interference fit or adhesively fixed to the outer wall of the tube body 11. In this manner, the insulating sleeve 14 only needs to be sleeved onto the tube body 11, which is easy to operate and has high assembly efficiency.

[0072] As an example, as shown in FIG6 , one end of the insulating sleeve 14 with 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 an adhesive 17. In one embodiment, the adhesive 17 is a high-temperature resistant glue. In this way, the outer wall of the insulating sleeve 14 can be aligned with the outer wall of the tube body 11. On the one hand, the overall appearance integrity of the heating tube 1 can be ensured. On the other hand, the outer 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. At the same time, it can reduce the gap between the heating tube 1 and the heater sleeve 2, thereby improving the heat transfer efficiency.

[0073] In one embodiment of the present application, the specific structure of the insulating sleeve 14 can be determined according to actual conditions.

[0074] As an example, as shown in Figures 4 and 5, the insulating sleeve 14 is a tubular structure. In this embodiment, the insulating sleeve 14 can be a straight tube (as shown in Figure 4), or the end of the insulating sleeve 14 facing away from the tube body 11 is configured to be constricted (as shown in 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 outward through the opening of the insulating sleeve 14, thereby further improving the heating efficiency of the heating tube 1.

[0075] As an example, as shown in FIG6 , the insulating sleeve 14 is a box-shaped structure, and the end of the insulating sleeve 14 facing away from the tube body 11 is closed. It is understood that the insulating sleeve 14 can fully or partially cover the portion of 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.

[0076] When the insulating sleeve 14 is fully enclosed, as shown in Figures 6(e) and 6(f), the insulating sleeve 14 is connected to the first end of the tube body 11 to form a relatively closed cavity. This provides a stronger encapsulation of the portion of the heating element 12 (first lead rod 122 and electrical connector 13) outside the tube body 11, further enhancing the electrical isolation effect. In this configuration, the two first lead rods 122 must be electrically connected or connected via the electrical connector 13 before installing the insulating sleeve 14.

[0077] When the insulating sleeve 14 is partially enclosed, as shown in FIG6( g ), a hollow hole (not shown) communicating with the accommodating cavity 142 can be provided on the peripheral wall of the insulating sleeve 14. The insulating sleeve 14 has two openings 141, each corresponding to a heater 12. The heating tube 1 also includes an electrical connector 13, which can be installed in the accommodating cavity 142 through the hollow hole to electrically connect the two heaters 12. In this embodiment, the insulating sleeve 14 protects the portion of the heater 12 outside the tube body 11 (the first lead rod 122 and the electrical connector 13) while enabling rapid heat transfer. In actual application, the two first lead-out rods 122 can be extended into the accommodating cavity 142 from the two openings 141, and then the electrical connector 13 is placed into the insulating sleeve 14 from 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 set up an additional special fixing structure to fix the insulating sleeve 14, which further simplifies the assembly process.

[0078] In one embodiment of the present application, as shown in 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, and the heating section 121 is arranged in 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 on the outside of the two first lead-out rods 122.

[0079] The heating section 121 is a structure with high heating efficiency, such as a resistance wire. By providing a first lead-out rod 122 at one end of each heating section 121 and electrically connecting the two first lead-out rods 122 to achieve electrical conduction between the two heating sections 121, direct bending of the resistance wire can be avoided, reducing damage to the resistance wire and thereby increasing the lifespan of the heating tube 1. Resistance wire is typically made of metal or alloy material and has a certain degree of elasticity. Direct bending of the resistance wire will cause it to deform, and the elasticity of the resistance wire will cause it to attempt to return to its original shape, potentially causing both ends of the resistance wire to contact the inner wall of the tube body 11. Arranging the two resistance wires side by side helps maintain the relative position between the two resistance wires, preventing the two resistance wires from contacting each other and the inner wall of the tube body 11.

[0080] In practical applications, the first lead-out rod 122 can be a conductive rod, a wire, a conductive sheet, or other conductive structures. The first lead-out rod 122 and the heating section 121 can be connected by welding, winding, or other electrical connection methods. It can be understood that the first lead-out rod 122 has a connection end. From the middle of the first lead-out rod 122 to the connection end, the cross-sectional area of ​​the first lead-out rod 122 gradually decreases, so that the connection end forms a tapered shape, which is conducive to the spiral resistance wire being sleeved on the connection end, increasing the contact area between the first lead-out rod 122 and the resistance wire, and ensuring the electrical connection between the first lead-out rod 122 and the resistance wire.

[0081] The heating section 121 is provided with a second lead rod 1231 at the second end. The second lead rod 1231 extends from the second end of the tube body 11 for electrical connection to an external power source. The connection structure between the second lead rod 1231 and the heating section 121 can be referred to the connection structure between the first lead rod 122 and the heating section 121, and will not be repeated here.

[0082] The insulating sleeve 14 is sleeved on the outside of the two first lead-out rods 122 to ensure that the parts of the two first lead-out rods 122 located outside the tube body 11 can be located in the accommodating cavity 142 of the insulating sleeve 14 to prevent electrical conduction with external conductors such as the heater sleeve 2 to cause leakage problems.

[0083] In one embodiment of the present application, the electrical connection method of the two first lead-out bars 122 can be determined according to actual conditions.

[0084] In one embodiment of the present application, as shown in Figures 4(a), 5(c), and 6(e), the two first lead-out rods 122 are fixed by welding. It is understood that, considering that the ends of the two first lead-out rods 122 connected to the heating section 121 are spaced apart, the ends of the two first lead-out rods 122 facing away from the heating section 121 can be bent toward each other so that the two first lead-out rods 121 contact each other, and then fixed by welding. In one embodiment, resistance welding or argon arc welding can be used.

[0085] In one embodiment of the present application, as shown in Figures 4(b), 5(d), 6(f) and 6(g), the heating tube 1 also includes an electrical connector 13 provided on the outside of the tube body 11, and the two first lead-out rods 122 are electrically connected through the electrical connector 13. In one embodiment, the electrical connector 13 can be a metal conductive part or a non-metallic conductive part. In actual application, considering the convenience and reliability of connection, the electrical connector 13 is selected from metal conductive parts. Metals usually have high strength and hardness, can withstand certain mechanical stresses, 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 actual application, considering the convenience and reliability of processing, the two first lead-out rods 122 are both welded and fixed to the electrical connector 13. In one embodiment, resistance welding or argon arc welding can be used.

[0086] In one embodiment of the present application, the two first lead-out bars 122 are bent and connected as one piece. In this embodiment, the two first lead-out bars 122 are configured as an integral structure, eliminating the need for additional electrical connection between the two first lead-out bars 122, further simplifying the manufacturing process. In practical applications, a single conductor can be bent to form the two first lead-out bars 122, with the ends of the two first lead-out bars 122 facing away from the bend connected to the two heating sections 121, respectively.

[0087] It should be noted that, in actual application, the electrical connection method of the two first lead-out bars 122 is not limited to the above-mentioned embodiments, and other embodiments may also be adopted, which is not limited here.

[0088] In one embodiment of the present application, as shown in FIG1 , 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 .

[0089] The insulating heat conductor 16 can conduct the heat of the heating element 12 to the 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, preventing 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, preventing 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. Magnesium oxide powder has good insulation properties 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.

[0090] Compared with the heating tube 1 in the prior art, the heating tube 1 in the embodiment of the present application simplifies the processing process and does not require folding, oil pressure forming and other process processes. The straight tube design facilitates the addition of magnesium oxide powder, so that the internal magnesium oxide powder filling density is high, and the heat of the resistance wire can be conducted outward in time, reducing the impact of the high temperature environment on the resistance wire and ensuring the life of the resistance wire.

[0091] In one embodiment, to prevent the two heating segments 121 from contacting each other, an isolation structure such as a partition (not shown) may be provided within the tube body 11. The partition is provided between the two heating segments 121 to isolate the two heating segments 121, thereby preventing contact between the two heating segments 121. The partition is made of an insulating material, such as silicone oil. Of course, in other embodiments, other support structures may be used to support the two resistance wires to ensure the relative position of the two resistance wires, thereby ensuring safety.

[0092] In one embodiment of the present application, as shown in Figures 2 and 3, the heating tube 1 also 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 sealed and connected to the tube mouth 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.

[0093] In actual application, the tube body 11 is filled with an insulating heat conductor 16. In this embodiment, insulating plugs 15 are provided at both ends of the tube body 11. The insulating plugs 15 seal the tube opening to prevent the insulating heat conductor 16 from getting damp and to prevent the insulating heat conductor 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.

[0094] In one embodiment of the present application, 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.

[0095] The two positioning holes 151 at the first end are used to secure the two first lead-out rods 122, and the two positioning holes 151 at the second end are used to secure the two second lead-out rods 1231, thereby positioning the two heating sections 121, preventing displacement of the two heating sections 121 and ensuring safety. In this embodiment, the two positioning holes 151 are spaced apart, allowing the two heating sections 121 to be spaced apart. This ensures a gap between the two heating sections 121, preventing the two heating sections 121 from contacting each other and causing safety hazards.

[0096] In one embodiment of the present application, the positioning hole 151 is coaxially arranged with the corresponding heating section 121. In one embodiment, the two positioning holes 151 are arranged in parallel, so that the two heating sections 121 are arranged parallel to each other, avoiding contact between the two heating sections 121.

[0097] In one embodiment, an interference fit may be formed between the positioning hole 151 and the first lead rod 122 , and between the positioning hole 151 and the terminal 123 , so as to enhance the sealing performance of the tube body 11 and prevent the insulating heat conductor 16 from being affected by moisture.

[0098] In this embodiment, both ends of the tube body 11 are open to facilitate filling with insulating heat conductors 16; the insulating plugs 15 provided at both ends of the tube body 11 can fix the two ends of the heating element 12, thereby ensuring the relative position of the two heating elements 12 and the tube body 11, avoiding the heating element 12 from contacting the inner wall of the tube body 11 and causing leakage, and the insulating plugs 15 play a supporting role for the heating section 121.

[0099] In one embodiment of the present application, as shown in FIG. 7 , the two connection terminals 123 are arranged at an angle, and the distance between the two connection terminals 123 is gradually expanded in a direction away from the tube body 11 .

[0100] Two terminals 123 extend from the second end of the tube body 11 for electrical connection to an external power source. As will be appreciated, one of the two terminals 123 is the positive pole, and the other is the negative pole. To ensure wiring safety, the distance between the two terminals 123 needs to be maximized to prevent short circuits by increasing the creepage distance. This embodiment further increases the distance between the two terminals 123 by gradually increasing the distance away from the tube body 11. In one embodiment, the two terminals 123 form a roughly "V"-shaped structure.

[0101] As an example, an insulating wrapping member 1232 is provided on the outside of the terminal 123 , and an end of the terminal 123 facing away from the tube body 11 is exposed from the insulating wrapping member 1232 .

[0102] One end of the second lead-out rod 1231 is connected to the heating section 121, and the other end extends beyond the second end to form a terminal 123 for electrical connection to an external power source. To prevent short circuits, an insulating sheath 1232 is provided on each second lead-out rod 1231. The end of the second lead-out rod 1231 facing away from the tube body 11 is exposed from the insulating sheath 1232, allowing for smooth connection to an external power source.

[0103] In one embodiment, the insulating wrapping member 1232 may be a heat shrink tubing structure, wrapped around the outer wall of the second lead-out rod 1231 .

[0104] In some embodiments, an insulating spacer may be provided at the outer end of the insulating plug 15 at the second end of the tube body 11 to further ensure the insulation of the two second lead-out rods 1231. The insulating spacer may be bonded to the insulating plug 15 and may be made of ceramic, glass, or polytetrafluoroethylene.

[0105] The heating tube of existing dry-type heaters requires folding and hydraulic forming during the manufacturing process, transforming a long, straight, round tube into a folded, long, straight, oval tube. Because the heating tube is threaded with a heating wire and filled with magnesium oxide powder, the hydraulic forming process squeezes the tube and the magnesium oxide powder inside, causing mechanical damage to the resistance wire inside the heater tube, which can easily cause premature damage during use. This existing technology also presents complex manufacturing processes for heating tubes and the resistance wire is prone to breakage.

[0106] Based on this, the present application proposes a heating tube 1, which is designed to eliminate the need for overall bending of the electric heating tube, simplify the processing technology, and reduce the risk of wire breakage. The structure of the heating tube 1 is described below by way of an embodiment.

[0107] Please refer to FIG. 1 to FIG. 6 . In the embodiment of the present application, the heating tube 1 includes a tube body 11 and a heating element 12 .

[0108] The tube body 11 has a first end and a second end opposite to each other; 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 the two heating sections 121 are respectively provided with a wiring terminal 123 at the second end, and both wiring terminals 123 extend out of the second end.

[0109] In this embodiment, the tube body 11 serves to install 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 to prevent the heating element 12 and the tube body 11 from conducting electricity and causing leakage problems. At the same time, the tube body 11 can quickly conduct the heat inside it to the outside. In one embodiment, the tube body 11 can be a metal tube or a non-metallic tube with good thermal conductivity. The tube body 11 itself can be an insulating material or a non-insulating material. When it is a non-insulating material, it can be isolated and insulated from the heating element 12 by filling the inside of the tube body 11 with insulating material. In one embodiment, the cross-sectional shape of the tube body 11 can be circular, semicircular, square, triangular or other special shapes. In actual application, the tube body 11 can be set as a circular tube that is easy to shape.

[0110] The heating element 12 includes two heating segments 121 arranged side by side. It is understood that the two heating segments 121 are spaced apart. The heating segments 121 may be resistance wires with high heating efficiency. In actual applications, the heating element 12 may include only the heating segments 121 or include the heating segments 121 and other conductive structures. When the heating element 12 includes only the heating segments 121, the entire heating element 12 may be a resistance wire structure. When the heating element 12 includes the heating segments 121 and other conductive structures, lead rod structures or wire structures may be provided at each end of the resistance wire.

[0111] The two heating segments 121 are electrically connected to the first end of the tube body 11. It is understandable that the electrical connection position of the two heating segments 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 segments 121 are respectively provided with terminal 123 at the second end of the tube body 11. The two terminal 123 are respectively a positive terminal and a negative terminal, which are used to extend from the second end of the tube body 11 to electrically connect to an external power supply structure, thereby achieving power supply and heating of the two heating segments 121. It can be seen that the terminal 123 of the two heating segments 121 both extend from the same end of the tube body 11, and there is no need to perform an oil pressure operation on the tube body 11, which simplifies the process and reduces mechanical damage to the tube body 11 and the resistance wire.

[0112] The specific structure of the terminal 123 can be determined according to actual conditions. For example, it can be a lead rod structure, a wire structure, a conductive sheet structure or other terminal structures. As long as it can ensure that the heating section 121 inside the tube body 11 is electrically connected to the external power supply, its specific structure is not limited here.

[0113] 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 order to achieve the overall folding and extrusion of the heating tube 1 in the related technology, the magnesium oxide powder filled inside needs to be in a loose state. The heat transfer efficiency of the loose magnesium oxide powder is poor, which will cause the internal heating wire to overheat and dry burn and break. This embodiment does not require the heating tube 1 to be bent as a whole, so there is no need to reduce the compactness of the magnesium oxide powder. In this way, the compactness of the magnesium oxide powder can be guaranteed, the thermal conductivity efficiency can be improved, and the heating wire can be prevented from overheating and dry burning, thereby reducing the occurrence of malfunctions.

[0114] In the heating tube 1 of the present application, two heating sections 121 are arranged side by side within the tube body 11. By electrically connecting the two heating sections 121 at the first end of the tube body 11, and providing a terminal 123 at the second end of the tube body 11, the two heating sections 121 are each provided with a terminal 123. Both terminals 123 extend from the second end for electrical connection to a power source external to the tube body 11, thereby achieving normal heating function of the two heating sections 121 within the tube body 11. By extending both terminals 123 of the heating element 12 from the same end of the tube body 11, this embodiment eliminates the need for hydraulic folding of the tube body 11, simplifies the processing, and reduces mechanical damage to the tube body 11 and the heating sections 121. Furthermore, the outer diameter of the tube body 11 can be easily controlled, with high processing precision. This greatly reduces 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 is promptly transferred to the sleeve and heat exchanged with the water, thereby ensuring the life of the heating tube 1.

[0115] In one embodiment of the present application, as shown in Figures 2, 4 and 5, each heating section 121 is provided with a first lead-out rod 122 corresponding to the first end, and the two first lead-out rods 122 at least partially extend out of the first end and are electrically connected outside the first end.

[0116] The heating section 121 is a structure with high heating efficiency, such as a resistance wire. By providing a first lead-out rod 122 at one end of each heating section 121 and electrically connecting the two first lead-out rods 122 to achieve electrical conduction between the two heating sections 121, direct bending of the resistance wire can be avoided, reducing damage to the resistance wire and thereby increasing the lifespan of the heating tube 1. Resistance wire is typically made of metal or alloy material and has a certain degree of elasticity. Direct bending of the resistance wire will cause it to deform, and the elasticity of the resistance wire will cause it to attempt to return to its original shape, potentially causing both ends of the resistance wire to contact the inner wall of the tube body 11. Arranging the two resistance wires side by side helps maintain the relative position between the two resistance wires, preventing the two resistance wires from contacting each other and the inner wall of the tube body 11.

[0117] In addition, the two first lead-out rods 122 at least partially extend from the first end and are electrically connected outside the first end. Compared with the method of extending the resistance wire from the tube body 11 and then electrically connecting it, it can prevent the external temperature of the tube body 11 from overheating.

[0118] In practical applications, the first lead-out rod 122 can be a conductive rod, a wire, a conductive sheet, or other conductive structures. The first lead-out rod 122 and the heating section 121 can be connected by welding, winding, or other electrical connection methods. It can be understood that the first lead-out rod 122 has a connection end. From the middle of the first lead-out rod 122 to the connection end, the cross-sectional area of ​​the first lead-out rod 122 gradually decreases, so that the connection end forms a tapered shape, which is conducive to the spiral resistance wire being sleeved on the connection end, increasing the contact area between the first lead-out rod 122 and the resistance wire, and ensuring the electrical connection between the first lead-out rod 122 and the resistance wire.

[0119] In one embodiment of the present application, the electrical connection method of the two first lead-out bars 122 can be determined according to actual conditions.

[0120] In one embodiment of the present application, as shown in FIG4 , the two first lead-out rods 122 are fixed by welding. It is understood that, considering that the ends of the two first lead-out rods 122 connected to the heating section 121 are spaced apart, the ends of the two first lead-out rods 122 facing away from the heating section 121 can be bent toward each other so that the two first lead-out rods 121 contact each other, and then fixed by welding. In one embodiment, resistance welding or argon arc welding can be used.

[0121] In one embodiment of the present application, as shown in Figure 5, the heating tube 1 also includes an electrical connector 13 provided on the outside of the tube body 11, and the two first lead-out rods 122 are electrically connected through the electrical connector 13. In one embodiment, the electrical connector 13 can be a metal conductive part or a non-metallic conductive part. In actual application, considering the convenience and reliability of connection, the electrical connector 13 is selected from metal conductive parts. Metals usually have high strength and hardness, can withstand certain mechanical stresses, 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 actual application, considering the convenience and reliability of processing, the two first lead-out rods 122 are both welded and fixed to the electrical connector 13. In one embodiment, resistance welding or argon arc welding can be used.

[0122] In one embodiment of the present application, the two first lead-out bars 122 are bent and connected as one piece. In this embodiment, the two first lead-out bars 122 are configured as an integral structure, eliminating the need for additional electrical connection between the two first lead-out bars 122, further simplifying the manufacturing process. In practical applications, a single conductor can be bent to form the two first lead-out bars 122, with the ends of the two first lead-out bars 122 facing away from the bend connected to the two heating sections 121, respectively.

[0123] It should be noted that, in actual application, the electrical connection method of the two first lead-out bars 122 is not limited to the above-mentioned embodiments, and other embodiments may also be adopted, which is not limited here.

[0124] In one embodiment of the present application, the heating element 12 is a resistance wire, which is bent to form two heating segments 121 .

[0125] In the prior art, the resistance wire is passed through the interior of the tube body 11 and then the tube body 11 is bent. In comparison, directly bending the resistance wire is less difficult to process, easier to operate, and causes less mechanical damage to the resistance wire.

[0126] In one embodiment of the present application, as shown in FIG. 2 , FIG. 4 , FIG. 5 and FIG. 6 , the heating tube 1 further includes an insulating sleeve 14 provided at the first end, and the insulating sleeve 14 is provided outside the two first lead-out rods 122 .

[0127] When the heating tube 1 is used in a dry-type heater, it is placed in the heater sleeve 2. Since the two first lead-out rods 122 are electrically connected outside the tube body 11, to prevent leakage caused by electrical conduction between the first lead-out rods 122 and the heater sleeve 2, this embodiment provides an insulating sleeve 14 at the first end of the tube body 11. The insulating sleeve 14 is placed outside the two first lead-out rods 122 to isolate the first lead-out rods 122 from the heater sleeve 2, thereby improving safety. The outer diameter of the insulating sleeve 14 is smaller than the inner diameter of the heater sleeve 2 to avoid interference with the installation of the heating tube 1 in the heater sleeve 2.

[0128] It should be noted that because the temperature inside the heater sleeve 2 is high when the heating tube 1 is powered on and heating, reaching a high temperature of 300°C to 400°C, the insulating sleeve 14 must be able to withstand long-term high-temperature conditions without deformation or instability, maintaining good insulation performance. In one embodiment, the insulating sleeve 14 can be made of a high-temperature resistant heat shrink tubing, a fiberglass insulating tubing, or other materials such as ceramics and glass. It can also be made of polyimide and its molecular structure-related chemicals, polyphenylene sulfide, polyether ketone and its molecular structure-related chemicals, or polytetrafluoroethylene and its molecular structure-related chemicals.

[0129] In one embodiment of the present application, the specific structure of the insulating sleeve 14 can be determined according to actual conditions.

[0130] As an example, as shown in (a) in FIG4 and (c) in FIG5, as well as (b) in FIG4 and (d) in FIG5, the insulating sleeve 14 is a cylindrical structure. In this embodiment, the insulating sleeve 14 can be directly mounted 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 necked 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 of the cylindrical structure in this embodiment are open, and the heat generated by the first lead-out rod 122 and the electrical connector 13 located inside the insulating sleeve 14 can be output outward through the opening of the insulating sleeve 14, thereby further improving the heating efficiency of the heating tube 1.

[0131] As an example, as shown in (e), (g), and (f) of Figure 6 , the insulating sleeve 14 is a box-shaped structure. It is understood that the insulating sleeve 14 has a housing cavity formed therein for accommodating the first lead rod 122 and the electrical connector 13. The box-shaped insulating sleeve 14 can fully or partially enclose the first lead rod 122 and the electrical connector 13. The insulating sleeve 14 can be made of materials such as ceramic beads, glass beads, or Teflon beads.

[0132] As shown in Figures 6(e) and 6(f), when the insulating sleeve 14 is fully enclosed, it connects to the first end of the tube body 11 to form a relatively closed cavity. This provides a stronger enclosure for the first lead-out rods 122 and the electrical connector 13, further enhancing the electrical isolation. In this configuration, the two first lead-out rods 122 must first be electrically connected, or connected via the electrical connector 13, before installing the insulating sleeve 14.

[0133] As shown in (g) of Figure 6, when the insulating sleeve 14 is partially wrapped, an opening can be provided on the outer wall of the insulating sleeve 14 to protect the first lead rod 122 and the electrical connector 13 while enabling rapid heat transfer. In addition, in actual application, one end of the insulating sleeve 14 can be connected to the first end of the tube body 11 so that the two first lead rods 122 extend into the insulating sleeve 14, and then the electrical connector 13 is placed into the insulating sleeve 14 through the opening and welded. In this embodiment, the insulating sleeve 14 can be bonded and fixed to the first end of the tube body 11. Alternatively, in some embodiments, two mounting holes can be provided at one end of the insulating sleeve 14 to pass through the two first lead rods 122, and then the electrical connector 13 is placed into the insulating sleeve 14 through the opening and welded to the two first lead rods 122. After welding, the insulating sleeve 14 is installed and fixed. In this way, the insulating sleeve 14 is directly fixed by the matching structure of the electrical connector 13 and the first lead rod 122, without the need to set up a special fixing structure to fix the insulating sleeve 14, further simplifying the assembly process.

[0134] In one embodiment of the present application, as shown in FIG1 , the tube body 11 is filled with an insulating heat conductor 16 , which isolates the two heating sections 121 and the heating element 12 from the tube wall of the tube body 11 .

[0135] The insulating heat conductor 16 can conduct the heat of the heating section 121 to the wall of the tube body 11, which is conducive to the transfer of heat from the heating section 121. Furthermore, the insulating heat conductor 16 can isolate the two heating sections 121, preventing the two heating sections 121 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, preventing 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. Magnesium oxide powder has good insulation properties 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 a timely manner, 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 section 121 of the heating tube 1 is well fixed and supported. This helps to maintain the relative position between the two heating sections 121 and prevent accidental damage to the heating section 121 due to vibration or displacement.

[0136] Compared with the heating tube 1 in the prior art, the heating tube 1 in the embodiment of the present application simplifies the processing process and does not require folding, oil pressure forming and other process processes. The straight tube design facilitates the addition of magnesium oxide powder, so that the internal magnesium oxide powder filling density is high, and the heat of the resistance wire can be conducted outward in time, reducing the impact of the high temperature environment on the resistance wire and ensuring the life of the resistance wire.

[0137] In one embodiment, to prevent the two heating segments 121 from contacting each other, an isolation structure such as a partition (not shown) may be provided within the tube body 11. The partition is provided between the two heating segments 121 to isolate the two heating segments 121, thereby preventing contact between the two heating segments 121. The partition is made of an insulating material, such as silicone oil. Of course, in other embodiments, other support structures may be used to support the two resistance wires to ensure the relative position of the two resistance wires, thereby ensuring safety.

[0138] To prevent the two heating segments 121 from contacting each other, the length of the heating segment 121 can be limited, for example, to less than 500 mm, to reduce the risk of displacement of the two heating segments 121 due to vibration. If the length of the heating segment 121 is too long, the heating segment 121 is prone to swinging when subjected to vibration, increasing uncertainty.

[0139] In one embodiment of the present application, as shown in Figures 2 and 3, the heating tube 1 also 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 sealed and connected to the tube mouth 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.

[0140] In actual application, the tube body 11 is filled with an insulating heat conductor 16. In this embodiment, insulating plugs 15 are provided at both ends of the tube body 11. The insulating plugs 15 seal the tube opening to prevent the insulating heat conductor 16 from getting damp and to prevent the insulating heat conductor 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.

[0141] In one embodiment of the present application, 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 terminal ends 123 respectively pass through the two positioning holes 151 at the second end.

[0142] The two positioning holes 151 at the first end are used to secure the two first lead-out rods 122, and the two positioning holes 151 at the second end are used to secure the two wiring terminals 123, thereby positioning the two heating segments 121 and preventing displacement of the two heating segments 121, thereby ensuring safety. In this embodiment, the two positioning holes 151 are spaced apart, allowing the two heating segments 121 to be spaced apart. This ensures a gap between the two heating segments 121, preventing the two heating segments 121 from contacting each other and creating safety hazards.

[0143] In one embodiment of the present application, the positioning hole 151 is coaxially arranged with the corresponding heating section 121. In one embodiment, the two positioning holes 151 are arranged in parallel, so that the two heating sections 121 are arranged parallel to each other, avoiding contact between the two heating sections 121.

[0144] In one embodiment, an interference fit may be formed between the positioning hole 151 and the first lead rod 122 , and between the positioning hole 151 and the terminal 123 , so as to enhance the sealing performance of the tube body 11 and prevent the insulating heat conductor 16 from being affected by moisture.

[0145] In this embodiment, both ends of the tube body 11 are open to facilitate filling with insulating heat conductors 16; the insulating plugs 15 provided at both ends of the tube body 11 can fix the two ends of the heating element 12, thereby ensuring the relative position of the two heating elements 12 and the tube body 11, avoiding the heating element 12 from contacting the inner wall of the tube body 11 and causing leakage, and the insulating plugs 15 play a supporting role for the heating section 121.

[0146] In one embodiment of the present application, as shown in FIG. 7 , the two connection terminals 123 are arranged at an angle, and the distance between the two connection terminals 123 is gradually expanded in a direction away from the tube body 11 .

[0147] Two terminals 123 extend from the second end of the tube body 11 for electrical connection to an external power source. As will be appreciated, one of the two terminals 123 is the positive pole, and the other is the negative pole. To ensure wiring safety, the distance between the two terminals 123 needs to be maximized to prevent short circuits by increasing the creepage distance. This embodiment further increases the distance between the two terminals 123 by gradually increasing the distance away from the tube body 11. In one embodiment, the two terminals 123 form a roughly "V"-shaped structure.

[0148] As an example, the terminal 123 includes a second lead-out rod 1231 and an insulating wrapping member 1232, one end of the second lead-out rod 1231 is connected to the corresponding heating section 121, and the other end extends out of the second end of the tube body 11; the insulating wrapping member 1232 is connected to the second end and wrapped around the outside of the second lead-out rod 1231, and the end of the second lead-out rod 1231 facing away from the tube body 11 is exposed to the insulating wrapping member 1232.

[0149] In this embodiment, the connection structure between the second lead-out rod 1231 and the heating section 121 and the connection structure with the insulating plug 15 can refer to the connection method of the first lead-out rod 122 mentioned above, and will not be repeated here. 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 of the tube body 11 for electrical connection to an external power source. In order to prevent short circuits, an insulating wrapping 1232 is provided on each second lead-out rod 1231, and at the same time, one end of the second lead-out rod 1231 facing away from the tube body 11 is exposed to the insulating wrapping 1232 so that it can be smoothly connected to the external power source.

[0150] In one embodiment, the insulating wrapping member 1232 may be a heat shrink tubing structure, wrapped around the outer wall of the second lead-out rod 1231 .

[0151] In some embodiments, an insulating spacer may be provided at the outer end of the insulating plug 15 at the second end of the tube body 11 to further ensure the insulation of the two second lead-out rods 1231. The insulating spacer may be bonded to the insulating plug 15 and may be made of ceramic, glass, or polytetrafluoroethylene.

[0152] This application also proposes a dry heater, as shown in Figures 1, 8, and 9. The dry heater includes a heater sleeve 2, a mounting base 3, and a heating tube 1. The specific structure of the heating tube 1 is similar to that of the above-mentioned embodiments. Since this dry heater adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail 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 at the position corresponding to the heater sleeve 2; the heating tube 1 is arranged inside the heater sleeve 2, and the terminal 123 of the heating tube 1 is arranged outside the heater sleeve 2.

[0153] In actual use, 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 tank opening 41 of the inner tank 4, securing the heater sleeve 2 within the inner tank 4. The heating tube 1 is installed within the heater sleeve 2, heating the water in the inner tank 4 through the heater sleeve 2. If the dry-type heater malfunctions, there is no need to remove the mounting base 3 or drain the water in the inner tank 4. The heater tube 1 can be simply removed from the heater sleeve 2, making disassembly and installation very simple.

[0154] In this embodiment, the tube body 11 of the heating tube 1 does not require folding or hydraulic processes, resulting in higher machining precision. The outer diameter of the heating tube can be controlled within a ±0.1mm range using a multi-roller tube reduction machine, significantly reducing the gap between the inner wall of the heating tube 1 and the heater sleeve 2. This ensures that the heat from the heating tube 1 is promptly transferred to the heater sleeve 2 and heat exchanged with the water, thus ensuring the life of the heating tube 1. Furthermore, an insulating sleeve 14 is provided within the heating tube 1 to isolate the heating element 12 from the heater sleeve 2, preventing electrical conduction between the heating element 12 and the heater sleeve 2, thereby improving safety.

[0155] The present application also provides a water heater, which includes an inner tank 4 and a heating tube 1. The specific structure of the heating tube 1 is similar to that of the above embodiments. Since the present water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. 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 it can be installed in the inner tank 4 for heating by other installation components.

[0156] The present application also proposes a water heater, as shown in Figure 9, which includes an inner tank 4 and a dry heater. The specific structure of the dry heater refers to the above embodiment. Since the present water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The closed end of the heater sleeve 2 extends into the inner tank 4, and the mounting base 3 is fixed to the tank opening 41 of the inner tank 4.

[0157] The inner tank 4 has an inlet pipe 51 and an outlet pipe 52. The inlet pipe 51 is used to bring cold water into the inner tank 4, and the outlet pipe 52 is used to discharge hot water from the inner tank 4. The inner tank 4 has a tank opening 41. By fixing the mounting base 3 to the tank opening 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 heater sleeve 2 heats the water in the inner tank 4. If the heating tube 1 malfunctions, the heating tube 1 can be directly removed without removing the mounting base 3 or draining the water in the inner tank 4, making disassembly and installation very simple.

[0158] The above description is merely an exemplary embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A heating tube, wherein, The heating tube comprises: 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 terminal extending out of the second end; and 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 pipe according to claim 1, wherein, 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 pipe according to claim 2, wherein, 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 or 3, wherein, 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 pipe according to any one of claims 2 to 4, wherein, 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 any one of claims 2 to 5, wherein, 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 pipe according to any one of claims 1 to 5, wherein, The heating element is a resistance wire, and the resistance wire is bent to form two heating sections.

8. The heating pipe according to any one of claims 1 to 7, wherein, The insulating sleeve is a ceramic piece, a glass piece or a Teflon piece.

9. The heating tube according to any one of claims 1 to 7, wherein, 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.

10. The heating tube according to claim 9, wherein, 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.

11. The heating pipe according to claim 10, wherein, 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.

12. The heating tube according to any one of claims 9 to 11, wherein, 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.

13. The heating tube according to any one of claims 1 to 12, wherein, 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.

14. The heating tube according to any one of claims 1 to 13, wherein, The tube body is filled with an insulating and heat-conducting material, which isolates the two heating elements from each other and isolates the heating elements from the tube wall of the tube body; and / or, the tube body is an insulating and heat-conducting member.

15. A dry heater, wherein, The dry-type heater includes: a heater sleeve with one end closed and the other end open; a mounting seat connected to the open end of the heater sleeve and open corresponding to the position of the heater sleeve; and a heating tube as described in any one of claims 1 to 14, the heating tube being disposed inside the heater sleeve, and the connection terminals of the heating tube being disposed outside the heater sleeve.

16. A water heater, wherein, The water heater includes an inner tank and a heating tube as described in any one of claims 1 to 14, the heating tube being adapted to heat the water in the inner tank; Alternatively, the water heater includes the dry-type heater described in claim 15 and an inner tank, the closed end of the heater sleeve extending into the inner tank, and the mounting seat being fixed to the mouth of the inner tank.

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