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 two heating pieces, and the pipe body is provided with a first end and a second end which are opposite to each other; the two heating pieces are arranged in the pipe body side by side; each heating piece comprises a heating section, and a first lead-out rod and a second lead-out rod which are respectively arranged at two ends of the heating section, the two first lead-out rods are electrically connected in the first end, and the two second lead-out rods respectively extend out of the second end to form two wiring ends. According to the technical scheme, folding oil pressure operation does not need to be carried out on the pipe body, the wire breaking risk is reduced, meanwhile, an insulation structure outside the pipe body does not need to be additionally considered, the machining technology can be simplified, and production efficiency is improved.

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] Two heating elements are arranged side by side in the tube body; each of the heating elements includes a heating section and a first lead-out rod and a second lead-out rod respectively arranged at both ends of the heating section, the two first lead-out rods are electrically connected inside the first end, and the two second lead-out rods extend out of the second end respectively to form two connection terminals.

[0008] In one embodiment of the present application, the heating tube further comprises a first insulating plug which is arranged at the first end of the tube body and seals the tube opening, and the first insulating plug wraps the electrical connection parts of the two first lead-out rods.

[0009] In one embodiment of the present application, the first insulating plug is accommodated inside the tube body.

[0010] In one embodiment of the present application, an end surface of the first insulating plug facing away from the heating element is flush with an end surface of the first end of the tube body.

[0011] In one embodiment of the present application, the two first lead-out bars are fixed by welding;

[0012] Or, the two first lead-out bars are electrically connected via an electrical connector;

[0013] Alternatively, the two first lead-out rods are an integral bent part.

[0014] In one embodiment of the present application, the heating section is a resistance wire; the resistance wire is arranged in a spiral shape and is sleeved on the end of the first lead-out rod.

[0015] In one embodiment of the present application, the heating tube also includes a second insulating plug arranged at the second end of the tube body and sealing the tube opening, the second insulating plug, the first insulating plug and the tube body together form a sealed cavity, the two heating sections are located in the sealed cavity, and the two second lead-out rods are passed through the second insulating plug.

[0016] In one embodiment of the present application, the second insulating plug is accommodated inside the second end of the tube body;

[0017] An end surface of the second insulating plug facing away from the first end is flush with an end surface of the second end of the tube body.

[0018] In one embodiment of the present application, the sealed cavity is filled with an insulating heat conductor, and the insulating heat conductor isolates the two heating elements and isolates the heating element from the tube wall of the tube body;

[0019] And / or, the tube body is an insulating heat-conducting member.

[0020] To achieve the above object, the present application also provides a dry heater, comprising:

[0021] a heater sleeve having one end closed and the other end open;

[0022] A mounting seat connected to an open end of the heater sleeve and opened corresponding to the position of the heater sleeve; and

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In the heating tube of the utility model technical solution, two heating elements are arranged side by side in the tube body, and the heating element includes a heating section and a first lead-out rod and a second lead-out rod respectively arranged at both ends of the heating section. By electrically connecting the two first lead-out rods inside the first end of the tube body, the two second lead-out rods extend out of the second end of the tube body to form two wiring terminals for electrically connecting with the power supply outside the tube body, so as to realize the normal heating function of the two heating elements in the tube body. In this embodiment, the two second lead-out rods of the heating element are extended from the same end of the tube body, so that there is no need to fold the tube body in half and perform hydraulic operation, which simplifies the processing technology and reduces the mechanical damage to the tube body and the heating element. At the same time, it is convenient to control the outer diameter of the tube body, the processing accuracy is higher, and the gap between the heating tube and the inner wall of the heater sleeve is greatly reduced, 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. In addition, by electrically connecting the two first lead-out rods inside the first end of the tube body, there is no need to consider the insulation problem of the conductor being exposed or extending outside the tube body, which further simplifies the processing technology and improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 This is a structural schematic diagram of an embodiment of a heating tube of the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0030] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0031] Figure 4 It is a structural schematic diagram of an embodiment of two first lead-out rods being welded and fixed in the utility model;

[0032] Figure 5 It is a structural schematic diagram of an embodiment of the utility model in which two first lead-out rods are fixed by an electrical connector;

[0033] Figure 6 This is a schematic diagram of the structure of the heating element in the embodiment of the utility model;

[0034] 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;

[0035] Figure 8 This is a structural schematic diagram of an embodiment of a water heater provided by the utility model.

[0036] Description of Figure Numbers:

[0037] Label name Label name 1 Heating tube 1521 Positioning hole 11 tube body 16 Insulation thermal conductor 12 Heating element 2 Heater sleeve 121 Heating section 3 Mounting Block 122 First lead rod 4 Liner 123 The second lead rod 41 Bile 13 Electrical connector 51 Water inlet pipe 151 First insulation plug 52 Outlet pipe 152 Second insulation plug

[0038] 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

[0039] 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.

[0040] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0042] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0043] 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.

[0044] 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.

[0045] In the embodiment of the present utility model, Figures 1 to 3 as well as Figure 6 As shown, the heating tube 1 includes a tube body 11 and two heating elements 12 .

[0046] 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, each heating element 12 includes a heating section 121 and a first lead-out rod 122 and a second lead-out rod 123 respectively arranged at both ends of the heating section 121, the two first lead-out rods 122 are electrically connected inside the first end, and the two second lead-out rods 123 extend out of the second end respectively to form two wiring terminals.

[0047] 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.

[0048] The two heating elements 12 are arranged side by side in the tube body 11. It can be understood that the two heating elements 12 are arranged at intervals in the tube body 11. The heating element 12 includes a heating section 121 and a first lead-out rod 122 and a second lead-out rod 123. The heating section 121 can be a resistance wire structure with higher heating efficiency. The two heating sections 121 are arranged in parallel and at intervals. The first lead-out rod 122 and the second lead-out rod 123 act as wire leads, wherein the first lead-out rod 122 of the two heating elements 12 are electrically conductive to electrically connect the two heating sections 121, and the two second lead-out rods 123 extend from the second end of the tube body 11 to form two wiring terminals, which are respectively a positive wiring terminal and a negative wiring terminal, for electrically connecting to an external power supply component to realize the power-on heating function of the two heating sections 121 in the tube body 11. It can be seen that the two second lead-out rods 123 of the two heating elements 12 extend from the same end of the tube body 11, without the 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.

[0049] In addition, the present embodiment realizes the electrical conduction function of the two heating sections 121 by electrically connecting the two first lead-out rods 122. Since the resistance wire is usually made of metal or alloy material and has a certain elasticity, compared with the solution of directly bending the resistance wire, the two first lead-out rods 122 in the present embodiment can support and limit the two heating sections 121, prevent the resistance wire from deforming and causing uneven heating temperature, and avoid contact between the resistance wire and the inner wall of the tube body 11, thereby ensuring electrical safety.

[0050] In practical applications, the first lead-out rod 122 can be a conductive rod, a wire, a conductive sheet or other conductive structures. It can be understood that the heating section 121 is a resistance wire, which is spiral-shaped. 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 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. Optionally, the connection method of the second lead-out rod 123 and the heating section 121 can refer to the connection method of the first lead-out rod 122 and the heating section 121, which will not be repeated here.

[0051] 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 the thermal conductivity. In the related technology, 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 then the heating wire can be prevented from overheating and dry burning, thereby reducing the occurrence of failures.

[0052] It should be noted that the two first lead-out rods 122 are electrically connected inside the first end of the tube body 11, so that the two first lead-out rods 122 will not be exposed or extend outside the tube body 11. Compared with the solution in the related art that the two first lead-out rods 122 are extended to the outside of the tube body 11 for electrical connection, the heating tube 1 of this embodiment only needs to perform a normal sealing process (the sealing itself requires insulation), and there is no need to additionally consider the insulation problem of the conductor being exposed or extending outside the tube body 11, and there are no additional problems regarding the connection of the external insulation structure and the temperature resistance of the material. In other words, the process of the heating tube 1 of this embodiment is simpler and the production efficiency is higher.

[0053] In the heating tube 1 of the utility model technical solution, two heating elements 12 are arranged side by side in the tube body 11, and the heating element 12 includes a heating section 121 and a first lead-out rod 122 and a second lead-out rod 123 respectively arranged at both ends of the heating section 121. By electrically connecting the two first lead-out rods 122 inside the first end of the tube body 11, the two second lead-out rods 123 respectively extend out of the second end of the tube body 11 to form two wiring terminals for being electrically connected to the power supply 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, the two second lead-out rods 123 of the heating element 12 are extended from the same end of the tube body 11, so that there is no need to perform hydraulic folding operation on the tube body 11, which simplifies the processing technology and reduces the 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, and the processing accuracy is higher. The gap between the inner wall of the heating tube 1 and the heater sleeve 2 is greatly reduced, which can ensure that the heat of the heating tube 1 is transferred to the sleeve in time and heat exchange with water is carried out, thereby ensuring the life of the heating tube 1. In addition, by electrically connecting the two first lead-out rods 122 inside the first end of the tube body 11, there is no need to consider the insulation problem of the conductor being exposed or extending outside the tube body 11, which further simplifies the processing technology and improves production efficiency.

[0054] Furthermore, the electrical connection method of the two first lead-out bars 122 can be determined according to actual conditions.

[0055] 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.

[0056] In one embodiment of the present application, Figure 5 , 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 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 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.

[0057] In one embodiment of the present application, Figure 2 , the two first lead-out rods 122 are bent and connected as one body. In this embodiment, the two first lead-out rods 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 rods 122, which further simplifies the processing technology. In practical applications, a conductor can be bent to form two first lead-out rods 122, and the ends of the two first lead-out rods 122 away from the bend are respectively connected to the two heating sections 121.

[0058] 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.

[0059] In one embodiment of the present application, Figure 2 , Figure 4 as well as Figure 5 The heating tube 1 further includes a first insulating plug 151 disposed at the first end of the tube body 11 and sealing the tube opening. The first insulating plug 151 wraps the electrical connection parts of the two first lead-out rods 122 .

[0060] It can be understood that in actual application, the tube body 11 is filled with an insulating heat conductive material 16 (such as magnesium oxide powder, etc.), and the first insulating plug 151 of this embodiment serves to seal the tube opening at the first end of the tube body 11 to prevent the insulating heat conductive material 16 (such as magnesium oxide powder, etc.) inside the tube body 11 from leaking.

[0061] In this embodiment, the first insulating plug 151 is wrapped around the electrical connection portion of the two first lead-out rods 122 so that the two first lead-out rods 122 will not be exposed or extended from the tube body 11, thereby ensuring the insulation effect at the first end of the tube body 11. When the heating tube 1 is used in the heater sleeve 2 of a dry heater or in the inner tank of a water heater, no conductive leakage fault will occur.

[0062] In addition, this embodiment directly uses the first insulating plug 151 for sealing the tube opening of the tube body 11 to insulate the two first lead-out rods 122 without adding an additional insulating structure to wrap the two first lead-out rods 122, thereby saving material costs and simplifying the processing technology.

[0063] It is understandable that the first insulating plug 151 can be completely accommodated inside the tube body 11, or can be partially located inside the tube body 11 and partially located outside the tube body 11, as long as it can seal the tube mouth of the tube body 11 and wrap the two first lead-out rods 122. As an example, considering the difficulty and cost of the processing technology, the first insulating plug 151 in this embodiment is accommodated inside the tube body 11. During processing, the first insulating plug 151 can be made of hot-melt material such as glass. After the heating element 12 and the insulating heat conductor 16 are set in the tube body 11, the hot-melt material is filled into the first end, and then the first insulating plug 151 structure is formed by high-temperature heat melting. At the same time, the first insulating plug 151 fixes the two first lead-out rods 122.

[0064] Furthermore, if Figure 2 , Figure 4 as well as Figure 5 , the end surface of the first insulating plug 151 facing away from the heating element 12 is flush with the end surface of the first end of the tube body 11. This arrangement makes the end surface of the first end of the heating tube 1 flush, so that it is easier to control the length of the heating tube 1. When the heating tube 1 is used in the heater sleeve 2, the gap between the end of the first end of the heating tube 1 and the inner wall of the heater sleeve 2 is easier to control, thereby improving the size matching accuracy of the heating tube 1 and the heater sleeve 2.

[0065] In one embodiment of the present application, Figure 3 The heating tube 1 also includes a second insulating plug 152 which is arranged at the second end of the tube body 11 and seals the tube opening. The second insulating plug 152, the first insulating plug 151 and the tube body 11 form a sealed cavity. The two heating sections 121 are located in the sealed cavity. The two second lead-out rods 123 are passed through the second insulating plug 152.

[0066] In this embodiment, the second insulating plug 152 seals the opening of the second end of the tube body 11 to prevent the insulating heat conductor 16 (such as magnesium oxide powder, etc.) from getting wet and prevent the insulating heat conductor 16 inside the tube body 11 from leaking. At the same time, the second insulating plug 152 also supports and fixes the two second lead rods 123.

[0067] Specifically, Figure 3 The second insulating plug 152 is provided with two spaced apart positioning holes 1521 , and the two second lead-out rods 123 respectively pass through the two positioning holes 1521 located at the second end.

[0068] It can be understood that the first insulating plug 151 at the first end is used to fix the two first lead-out rods 122, and the two positioning holes 1521 at the second end are used to fix the two second lead-out rods 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 arranging the two positioning holes 1521 at intervals, the two heating sections 121 can be arranged at intervals, and the gap between the two heating sections 121 can be ensured, avoiding the two heating sections 121 from contacting each other to cause safety hazards.

[0069] Furthermore, if Figure 3 , the positioning hole 1521 and the corresponding heating section 121 are coaxially arranged. Optionally, the two positioning holes 1521 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.

[0070] Optionally, the positioning hole 1521 is interference-fitted with the second lead-out rod 123 to enhance the sealing performance of the tube body 11 .

[0071] It can be understood that the second insulating plug 152 can be completely accommodated inside the tube body 11, or can be partially located inside the tube body 11 and partially located outside the tube body 11, as long as the tube mouth of the tube body 11 can be blocked. As an example, considering the difficulty of the processing technology and the cost and other factors, the second insulating plug 152 in this embodiment is accommodated inside the tube body 11. During processing, the second insulating plug 152 can be made of hot-melt material such as glass. After the heating element 12 and the insulating heat conductor 16 are arranged in the tube body 11, the hot-melt material is filled into the second end, and then the second insulating plug 152 structure is formed by high-temperature heat melting. At the same time, the second insulating plug 152 fixes the two second lead rods 123.

[0072] Furthermore, if Figure 3 The end surface of the second insulating plug 152 facing away from the first end is flush with the end surface of the second end of the tube body 11.

[0073] It can be understood that in actual application, in order to ensure the electrical safety of the two connection terminals of the heating tube 1, an insulating wrapping piece can be provided on the two second lead-out rods 123 extending out of the tube body 11. In this embodiment, the end face of the second insulating plug 152 facing away from the first end is flush with the end face of the second end of the tube body 11, so that the insulating wrapping piece can be connected to the second insulating plug 152 and the tube body 11 at the same time, thereby further improving the insulation effect at the second end of the heating tube 1.

[0074] Furthermore, in order to ensure wiring safety, the creepage distance of the two second lead-out bars 123 needs to be increased as much as possible to prevent short circuit. When used, the distance between the two second lead-out bars 123 can be gradually expanded in the direction away from the tube body 11. Optionally, the two second lead-out bars 123 roughly form a "V"-shaped structure.

[0075] In one embodiment of the present application, Figure 1 The sealed cavity is filled with an insulating heat conductor 16 , which isolates the two heating elements 12 and 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] The utility model also proposes a dry heater, such as Figure 1 , Figure 7 as well as Figure 8The 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

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

Claims

1. A heating tube, characterized in that: include: a tube body having opposite first and second ends; and Two heating elements are arranged side by side in the tube body; each of the heating elements comprises a heating section and a first lead-out rod and a second lead-out rod respectively arranged at two ends of the heating section, the two first lead-out rods are electrically connected inside the first end, and the two second lead-out rods extend out of the second end to form two wiring terminals; The heating tube further comprises a first insulating plug which is arranged at the first end of the tube body and blocks the tube opening, wherein the first insulating plug wraps the electrical connection parts of the two first lead-out rods; The first insulating plug is accommodated inside the tube body; The end surface of the first insulating plug facing away from the heating element is flush with the end surface of the first end of the tube body.

2. The heating tube according to claim 1, characterized in that: The two first lead-out rods are welded and fixed; Or, the two first lead-out bars are electrically connected via an electrical connector; Alternatively, the two first lead-out rods are an integral bent part.

3. The heating tube according to claim 2, characterized in that: The heating section is a resistance wire; the resistance wire is arranged in a spiral shape and sleeved on the end of the first lead-out rod.

4. The heating tube according to any one of claims 1 to 3, characterized in that: The heating tube also includes a second insulating plug which is arranged at the second end of the tube body and seals the tube opening; the second insulating plug, the first insulating plug and the tube body together form a sealed cavity; the two heating sections are located in the sealed cavity; and the two second lead-out rods are passed through the second insulating plug.

5. The heating tube according to claim 4, characterized in that: The second insulating plug is accommodated inside the second end of the tube body; An end surface of the second insulating plug facing away from the first end is flush with an end surface of the second end of the tube body.

6. The heating tube according to claim 4, characterized in that: The sealed cavity is filled with an insulating heat conductor, which isolates the two heating elements and isolates the heating element from the tube wall of the tube body; And / or, the tube body is an insulating heat-conducting member.

7. 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 6, wherein the heating tube is arranged in the heater sleeve, and the connection terminal of the heating tube is arranged outside the heater sleeve.

8. A water heater, characterized in that: The water heater comprises an inner tank and a heating tube as claimed in any one of claims 1 to 6, wherein the heating tube is suitable for heating water in the inner tank; Alternatively, the water heater comprises the dry heater according to claim 7 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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