Heating pipe, dry heater and water heater

Abstract

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

Description

Technical Field

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

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

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

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

[0005] In order to achieve the above-mentioned purpose, the heating tube proposed by the utility model comprises:

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

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

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

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

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

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

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

[0013] Alternatively, the heating section is a resistance wire, and the heating tube further comprises an electrical connector, and the electrical connector is used to conduct the two resistance wires.

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

[0015] In one embodiment of the present application, 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 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.

[0016] In one embodiment of the present application, 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;

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

[0018] 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.

[0019] In one embodiment of the present application, the connection terminal includes:

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

[0021] An insulating wrapping piece is connected to the second end and wrapped around the outside of the second lead-out rod, and one end of the second lead-out rod facing away from the tube body is exposed to the insulating wrapping piece.

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

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

[0024] To achieve the above object, the present application also provides a dry heater, comprising:

[0025] a heater sleeve having one end closed and the other end open;

[0026] A mounting seat connected to an open end of the heater sleeve and opened corresponding to the position of the heater sleeve; and

[0027] The above-mentioned heating tube is arranged in the heater sleeve, and the connection terminal of the heating tube is arranged outside the heater sleeve.

[0028] 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.

[0029] To achieve the above objectives, the present application also provides a water heater, which includes the above 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.

[0030] In the heating tube of the technical solution of the utility model, two heating sections are arranged side by side in the tube body, and the two heating sections are electrically connected at the first end of the tube body, and the two heating sections are respectively provided with wiring terminals at the second end of the tube body, and the two wiring terminals are both extended from the second end for being electrically connected to the power supply outside the tube body, thereby realizing the normal heating function of the two heating sections in the tube body. In this embodiment, by extending the two wiring terminals of the heating element from the same end of the tube body, there is no need to fold the tube body in half and perform oil pressure operation, which simplifies the processing technology and reduces the mechanical damage to the tube body and the heating section; at the same time, it is convenient to control the outer diameter of the tube body, with high processing accuracy, and greatly reduces the gap between the heating tube and the inner wall of the heater sleeve, which can ensure that the heat of the heating tube is transferred to the sleeve in time and heat exchange with water, thereby ensuring the life of the heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of an embodiment of a heating tube provided by the utility model;

[0033] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0034] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0035] Figure 4 This is a schematic structural diagram of an embodiment of the electrical connection of two first lead-out bars at the first end of the tube body in the utility model;

[0036] Figure 5This is a schematic structural diagram of an embodiment of the utility model in which two first lead-out rods at the first end of the tube body are electrically connected through an electrical connector;

[0037] Figure 6 It is a structural schematic diagram of the connection terminal at the second end of the tube body in the utility model;

[0038] Figure 7 This is a schematic diagram of the structure of the heater sleeve and the mounting base in the embodiment of the utility model;

[0039] Figure 8 This is a structural schematic diagram of an embodiment of a water heater provided by the utility model.

[0040] Description of Figure Numbers:

[0041] Label name Label name 1 Heating tube 15 Insulation plug 11 tube body 151 Positioning hole 12 Heating element 16 Insulation thermal conductor 121 Heating section 2 Heater sleeve 122 First lead rod 3 Mounting Block 123 Terminals 4 Liner 1231 The second lead rod 41 Bile 1232 Insulation wrap 51 Water inlet pipe 13 Electrical connector 52 Outlet pipe 14 Insulation sleeve

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

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

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

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or 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 utility model.

[0046] The heating tube of the existing dry heater needs to be folded in half and hydraulically formed during the processing, and a long straight round tube is processed into a long straight oval tube body 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 in advance during use. The existing technology has the problem that the heating tube processing process is complicated and the resistance wire is easy to break.

[0047] Based on this, the utility model proposes a heating tube 1, which is intended to simplify the processing technology and reduce the risk of wire breakage without bending the electric heating tube as a whole. The structure of the heating tube 1 is described below in the form of an embodiment.

[0048] See also Figures 1 to 5 In the embodiment of the utility model, the heating tube 1 includes a tube body 11 and a heating element 12 .

[0049] 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 wiring terminals 123 at the second end, and the two wiring terminals 123 both extend out of the second end.

[0050] 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 leakage problem caused by the electrical conduction between the heating element 12 and the tube body 11, and at the same time, the tube body 11 can quickly conduct the heat inside it to the outside. Optionally, the tube body 11 can be a metal tube or a non-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. Optionally, the cross-sectional shape of the tube body 11 can be circular, semicircular, square, triangular or other special-shaped shapes. In practical applications, the tube body 11 can be set as a circular tube that is easy to form.

[0051] The heating element 12 includes two heating sections 121 arranged side by side. It can be understood that the two heating sections 121 are arranged at intervals. The heating section 121 can be a resistance wire with high heating efficiency. In practical applications, the heating element 12 can include only the heating section 121 or include the heating section 121 and other conductive structures. When the heating element 12 includes only the heating section 121, the heating element 12 can be a resistance wire structure as a whole. When the heating element 12 includes the heating section 121 and other conductive structures, lead-out rod structures or wire structures can be respectively provided at both ends of the resistance wire.

[0052] The two heating sections 121 are electrically connected to the first end of the tube body 11. It is understandable that the electrical connection position of the two heating sections 121 can be located outside the first end of the tube body 11 or inside the first end of the tube body 11. The two heating sections 121 are respectively provided with wiring terminals 123 at the second end of the tube body 11. The two wiring terminals 123 are respectively a positive wiring terminal and a negative wiring terminal, which are used to extend out of the second end of the tube body 11 and electrically connect to an external power supply structure to realize the power-on heating of the two heating sections 121. It can be seen that the wiring terminals 123 of the two heating sections 121 are both extended from the same end of the tube body 11, and there is no need to perform a hydraulic operation on the tube body 11 to fold it in half, which simplifies the process and reduces mechanical damage to the tube body 11 and the resistance wire.

[0053] 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.

[0054] It should be noted that in actual application, the tube body 11 is filled with magnesium oxide powder with good thermal conductivity. The compactness of the magnesium oxide powder is related to the thermal conductivity. In order to realize 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. 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 then the heating wire can be prevented from overheating and dry burning, thereby reducing the occurrence of failures.

[0055] In the heating tube 1 of the technical solution of the utility model, two heating sections 121 are arranged side by side in the tube body 11, and the two heating sections 121 are electrically connected at the first end of the tube body 11, and the two heating sections 121 are respectively provided with wiring terminals 123 at the second end of the tube body 11, and the two wiring terminals 123 are both extended from the second end, so as to be electrically connected to the power supply outside the tube body 11, thereby realizing the normal heating function of the two heating sections 121 in the tube body 11. In this embodiment, by extending the two wiring terminals 123 of the heating element 12 from the same end of the tube body 11, there is no need to perform oil pressure operation on the tube body 11, simplifying the processing technology, reducing mechanical damage to the tube body 11 and the heating sections 121; 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, and ensuring that the heat of the heating tube 1 is transferred to the sleeve in time and heat exchanged with water, thereby ensuring the life of the heating tube 1.

[0056] In one embodiment of the present application, Figure 2 , Figure 4 as well as Figure 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.

[0057] It can be understood that the heating section 121 is a structure with high heating efficiency, such as a resistance wire. By arranging a first lead-out rod 122 at one end of each heating section 121, and using two first lead-out rods 122 to electrically connect the two heating sections 121, it is possible to avoid direct bending of the resistance wire, reduce damage to the resistance wire, and thus increase the life of the heating tube 1. The resistance wire is usually made of metal or alloy material and has a certain elasticity. If the resistance wire is directly bent, the resistance wire will be deformed, and the elasticity of the resistance wire will make it try to return to its original shape, so that the two ends of the resistance wire may contact the inner wall of the tube body 11. By arranging 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 avoid the resistance wire from contacting the inner wall of the tube body 11.

[0058] In addition, the two first lead-out rods 122 at least partially extend out of 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.

[0059] 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, and the area of ​​the cross section of the first lead-out rod 122 gradually decreases from the middle of the first lead-out rod 122 to the connection end, so that the connection end forms a cone, which is conducive to the spiral resistance wire being sleeved on the connection end, increasing the contact area between the first lead-out rod 122 and the resistance wire, and ensuring the electrical connection between the first lead-out rod 122 and the resistance wire.

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

[0061] In one embodiment of the present application, Figure 4 , the two first lead-out rods 122 are welded and fixed. It is understandable that, considering that the two first lead-out rods 122 are spaced apart from one end connected to the heating section 121, the two first lead-out rods 122 can be bent toward each other at one end away from the heating section 121, so that the two first lead-out rods 121 are in contact, and then fixed by welding. Optionally, resistance welding or argon arc welding can be used.

[0062] In one embodiment of the present application, Figure 5 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.

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

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

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

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

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

[0068] It can be understood that when the heating tube 1 is used in a dry heater, the heating tube 1 is placed in the heater sleeve 2 for use. Since the two first lead rods 122 are electrically connected outside the tube body 11, in order to avoid leakage caused by electrical conduction between the first lead rods 122 and the heater sleeve 2, this embodiment provides an insulating sleeve 14 at the first end of the tube body 11, and the insulating sleeve 14 is sleeved outside the two first lead rods 122 to isolate the first lead 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, so as to avoid hindering the heating tube 1 from being installed in the heater sleeve 2.

[0069] It should be noted that, because the temperature inside the heater sleeve 2 is relatively high when the heating tube 1 is powered on for heating, reaching a high temperature of 300°C to 400°C, the insulating sleeve 14 needs to meet the requirements of not deforming and not changing under long-term high temperature conditions, and maintain good insulation performance. Optionally, the insulating sleeve 14 can be made of a high-temperature resistant heat shrink sleeve, a glass fiber insulating sleeve, or a material such as ceramics, glass, or a chemical substance with a similar molecular structure to polyimide, or a chemical substance with a similar molecular structure to polyphenylene sulfide, polyether ketone, or a chemical substance with a similar molecular structure to polytetrafluoroethylene.

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

[0071] As an example, Figure 4 (a) and (b) in Figure 5 In (f) and (g), 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 shrinking 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 to the outside through the opening of the insulating sleeve 14, thereby further improving the heating efficiency of the heating tube 1.

[0072] As an example, Figure 4 (c) Figure 5 (d) and (e), the insulating sleeve 14 is a box structure. It can be understood that the insulating sleeve 14 is formed with a receiving cavity for receiving the first lead rod 122 and the electrical connector 13. The insulating sleeve 14 of the box structure can fully or partially wrap 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.

[0073] like Figure 4 (c) and Figure 5 (e) When the insulating sleeve 14 is fully wrapped, the insulating sleeve 14 is connected to the first end of the tube body 11 to form a relatively closed cavity, and the wrapping of the first lead rod 122 and the electrical connector 13 is stronger, 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.

[0074] like Figure 5(d), when the insulating sleeve 14 is partially wrapped, an opening can be provided on the outer peripheral wall of the insulating sleeve 14, so as to protect the first lead rod 122 and the electrical connector 13 while enabling rapid heat transfer. In addition, in practical applications, 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 penetrate the two first lead rods 122, and then the electrical connector 13 is placed into the insulating sleeve 14 from the opening and welded with 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 and limited 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, which further simplifies the assembly process.

[0075] 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 sections 121 and isolates the heating element 12 from the tube wall of the tube body 11 .

[0076] The insulating heat conductor 16 can transfer the heat of the heating section 121 to the tube 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 to prevent 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 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 in 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.

[0077] It can be understood that compared with the heating tube 1 in the prior art, the heating tube 1 in the embodiment of the utility model simplifies the processing flow, and does not require process flows such as folding and oil pressure forming. 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.

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

[0079] In order to prevent the two heating sections 121 from contacting each other, the length of the heating section 121 can be limited, for example, the length of the heating section 121 is less than 500 mm, so as to reduce the risk of displacement of the two heating sections 121 due to vibration. If the length of the heating section 121 is too long, the heating section 121 is easy to swing when vibrated, increasing uncertainty.

[0080] In one embodiment of the present application, Figure 2 and Figure 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. The two ends of the heating element 12 are respectively fixed to the two insulating plugs 15.

[0081] It can be understood that in actual application, the tube body 11 is filled with an insulating heat conductor 16. In the present 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.

[0082] 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 located at the first end, and the two wiring terminals 123 respectively pass through the two positioning holes 151 located at the second end.

[0083] It can be understood that the two positioning holes 151 at the first end are used to fix the two first lead-out rods 122, and the two positioning holes 151 at the second end are used to fix the two wiring terminals 123, so as to position the two heating sections 121, avoid displacement of the two heating sections 121, and ensure safety. In this embodiment, by setting the two positioning holes 151 at intervals, the two heating sections 121 can be set at intervals, and the gap between the two heating sections 121 can be guaranteed, avoiding the two heating sections 121 from contacting each other to cause safety hazards.

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

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

[0086] In this embodiment, both ends of the tube body 11 are open to facilitate filling with insulating heat conductors 16; the insulating plugs 15 arranged 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 to cause leakage, and the insulating plugs 15 play a supporting role for the heating section 121.

[0087] In one embodiment of the present application, Figure 6 The two connection terminals 123 are arranged at an angle, and the distance between the two connection terminals 123 is gradually expanded in the direction away from the tube body 11.

[0088] Two terminals 123 extend from the second end of the tube body 11 for electrical connection with an external power source. It is understandable that one of the two terminals 123 is a positive pole and the other is a negative pole. In order to ensure the safety of the wiring, the distance between the two terminals 123 needs to be increased as much as possible to increase the creepage distance and prevent short circuit. In this embodiment, the distance between the two terminals 123 is gradually expanded in the direction away from the tube body 11, so that the distance between the two terminals 123 can be further increased. Optionally, the two terminals 123 roughly form a "V"-shaped structure.

[0089] As an example, the terminal 123 includes a second lead-out rod 1231 and an insulating wrapping member 1232, wherein 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 one end of the second lead-out rod 1231 facing away from the tube body 11 is exposed from the insulating wrapping member 1232.

[0090] 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, 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 with an external power source. In order to prevent short circuits, an insulating wrapping member 1232 is provided on each second lead-out rod 1231, and at the same time, one end of the second lead-out rod 1231 away from the tube body 11 is exposed to the insulating wrapping member 1232, so that it can be smoothly connected to the external power source.

[0091] Optionally, the insulating wrapping piece 1232 may be a heat shrink tubing structure, wrapped around the outer wall of the second lead-out rod 1231 .

[0092] In some embodiments, an insulating spacer may be added to the outer end of the insulating plug 15 at the second end of the tube body 11 to further ensure the insulation effect of the two second lead-out rods 1231. The insulating spacer may be bonded and fixed to the insulating plug 15, and the insulating spacer may be made of ceramic, glass, or polytetrafluoroethylene.

[0093] The utility model also proposes a dry heater, such as Figure 1 , Figure 7 as well as Figure 8 The dry heater comprises a heater sleeve 2, a mounting seat 3 and a heating tube 1. The specific structure of the heating tube 1 refers to the above embodiment. Since the dry 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 repeated here. Among them, one end of the heater sleeve 2 is closed and the other end is open; the mounting seat 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 in the heater sleeve 2, and the terminal 123 of the heating tube 1 is arranged outside the heater sleeve 2.

[0094] In actual application, the closed end of the heater sleeve 2 extends into the inner tank 4 of the water heater, and the mounting seat 3 is installed at the tank opening 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 in the heater sleeve 2, and the water in the inner tank 4 is heated by the heater sleeve 2. If the dry heater fails, there is no need to remove the mounting seat 3 or drain the water in the inner tank 4. The heating tube 1 can be directly removed from the heater sleeve 2, and the disassembly and installation are very simple.

[0095] In this embodiment, the tube body 11 of the heating tube 1 does not need to be folded in half or subjected to processes such as oil pressure, so the processing accuracy of the tube body 11 is higher. The outer diameter of the heating tube can be processed by a multi-roller tube shrinking machine and can be controlled within the range of ±0.1mm, thereby greatly reducing the gap between the heating tube 1 and the inner wall size of the heater sleeve 2, ensuring that the heat of the heating tube 1 is transferred to the heater sleeve 2 in time and exchanges heat with water, thereby ensuring the life of the heating tube 1.

[0096] The utility model also provides a water heater, which includes an inner tank 4 and a heating tube 1. The specific structure of the heating tube 1 refers to the above embodiment. Since the water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated 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 the heating tube 1 can be installed in the inner tank 4 for heating through other installation components.

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

[0098] 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 is provided with a tank opening 41. By fixing the mounting seat 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 water in the inner tank 4 is heated by the heater sleeve 2. When the heating tube 1 fails, there is no need to remove the mounting seat 3 or drain the water in the inner tank 4. The heating tube 1 can be directly removed, and the removal and installation are very simple.

[0099] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

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

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

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

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

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

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

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

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

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

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

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

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

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