Double-power heating wire heating tube

Abstract

The invention provides a double-power heating wire heating tube, which relates to the technical field of heating equipment and comprises a heating tube body, a first heating wire and a second heating wire, the first heating wire and the second heating wire are spirally wound on the outer surface of the heating tube body, and the power of the first heating wire is different from that of the second heating wire. One end of the first electric heating wire and one end of the second electric heating wire are connected through plane welding to form a welding connection part, the end, away from the welding connection part, of the first electric heating wire is used for being connected with a first conductive clamping ring, the end, away from the welding connection part, of the second electric heating wire is used for being connected with a second conductive clamping ring, and the welding connection part is used for being connected with a common electrode conductive clamping ring. The first conductive clamping ring and the second conductive clamping ring form independent current input ends respectively, and the common electrode conductive clamping ring forms a common output end of current. Mechanical connection is replaced by plane welding, the problems of uneven stress and contact resistance fluctuation caused by the thickness difference of the electric heating wires are solved, and the reliability and constant-temperature control precision of the double-power electric heating wire heating tube are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heating devices, and more particularly, to a dual-power electric heating wire heating tube. Background Art

[0002] In the field of electric heating devices such as instant electric water heaters and industrial fluid heating devices, in order to meet different power requirements, a segmented electric heating body structure is often adopted. Taking a dual-segment electric heating body as an example, electric heating flat wires with different thicknesses or widths are usually combined, and a conductive copper collar is used to connect at the butt joint between the two segments of electric heating wires. In related technologies, most of the copper collars adopt an integral planar contact structure and are connected by means of bolt fastening. However, when there is a thickness difference between the two butt-jointed electric heating wires, uneven stress distribution will occur in actual applications. Specifically, the surface of the electric heating wire at a higher position bears an excessive pressing force, while a contact gap is formed at a lower position. This uneven stress will cause a series of technical problems: First, under the action of thermal stress generated during long-term operation of the device, the electrical contact points are prone to micro-displacement, resulting in fluctuations in contact resistance; Second, due to the difference in thermal expansion coefficients of different materials, the separation trend of the contact surface will be further aggravated, causing a step change in contact resistance. And the above changes in contact resistance will directly lead to uncontrollable fluctuations in heating power, resulting in deviations in the outlet water temperature of the instant heating device and seriously affecting the accuracy of constant temperature control. Summary of the Invention

[0003] The problem to be solved by the present invention is: how to solve at least one of the technical problems of uneven stress distribution caused by the thickness difference of the dual-segment electric heating wire, thereby causing fluctuations in contact resistance, uncontrollable heating power, deviation in the outlet water temperature of the instant heating device, and low constant temperature control accuracy.

[0004] To solve the above problems, the present invention provides a dual-power electric heating wire heating tube, including a heating tube body, and a first electric heating wire and a second electric heating wire spirally wound around the outer surface of the heating tube body. The powers of the first electric heating wire and the second electric heating wire are different. One end of the first electric heating wire is connected to one end of the second electric heating wire by planar welding to form a welded connection portion. The end of the first electric heating wire away from the welded connection portion is used to connect a first conductive collar, and the end of the second electric heating wire away from the welded connection portion is used to connect a second conductive collar. The welded connection portion is used to connect a common-pole conductive collar. The first conductive collar and the second conductive collar respectively constitute independent current input ends, and the common-pole conductive collar constitutes a common output end of the current.

[0005] Optionally, a conductive connection layer is provided at the welding connection portion of the heating tube body, and the first heating wire and the second heating wire on both sides of the welding connection portion are electrically connected to the conductive connection layer; the common pole conductive retaining ring is electrically connected to the conductive connection layer.

[0006] Optionally, the conductive connection layer is a conductive thin film coated on the surface of the heating tube body, and the conductive thin film is conductive silver paste.

[0007] Optionally, the conductive connection layer is a conductive collar sleeved on the outer surface of the heating tube body.

[0008] Optionally, a shorting gasket is provided between the welding connection portion and the common pole conductive retaining ring, and the shorting gasket is in close contact with the welding connection portion and the common pole conductive retaining ring respectively.

[0009] Optionally, the common pole conductive retaining ring includes two parallel conductive strips, one ends of the two conductive strips are respectively pressed on the surfaces of the first heating wire and the second heating wire on both sides of the welding connection portion, and the other ends of the two conductive strips are fixedly connected by fasteners.

[0010] Optionally, the common pole conductive retaining ring has a middle convex portion and inclined side walls extending to both sides; the middle convex portion is located above the welding connection portion and has a gap with the welding connection portion; the inclined side walls are respectively pressed on the first heating wire and the second heating wire on both sides of the welding connection portion.

[0011] Optionally, the common pole conductive retaining ring includes a C-shaped base body and a first floating conductive block and a second floating conductive block provided at both ends of the opening of the base body; a spring cavity is provided in the base body, and an elastic member is provided in the spring cavity; one sides of the first floating conductive block and the second floating conductive block facing the spring cavity are both connected to the elastic member, and the other sides of the first floating conductive block and the second floating conductive block away from the spring cavity are respectively pressed on the surfaces of the first heating wire and the second heating wire on both sides of the welding connection portion; a back plate extending axially is provided on the base body, and the back plate is used for connecting with the end cover of the heating tube body.

[0012] Optionally, conductive columns are provided on one sides of the first floating conductive block and the second floating conductive block facing the spring cavity, one ends of the conductive columns extend into the spring cavity and are slidably connected to the base body, and one end of the elastic member is sleeved on the outer periphery of the conductive column.

[0013] Optionally, a U-shaped stress groove is provided in the area of the base body between the first floating conductive block and the second floating conductive block.

[0014] The dual-power electric heating wire heating tube of the present invention mainly consists of a heating tube body, a first electric heating wire, and a second electric heating wire. The first electric heating wire and the second electric heating wire are spirally wound around the outer surface of the heating tube body, and their powers are different. One end of the first electric heating wire and the second electric heating wire are connected by planar welding to form a welded connection part. The end of the first electric heating wire far from the welded connection part is connected to a first conductive retaining ring, the end of the second electric heating wire far from the welded connection part is connected to a second conductive retaining ring, and the common pole conductive retaining ring is connected at the welded connection part. The first conductive retaining ring and the second conductive retaining ring serve as independent current input terminals respectively, and the common pole conductive retaining ring serves as the common output terminal of the current. When currents are respectively input from the first conductive retaining ring and the second conductive retaining ring, the currents pass through the first electric heating wire and the second electric heating wire, finally converge at the welded connection part, and are output from the common pole conductive retaining ring, thereby realizing the independent operation or collaborative operation of the first electric heating wire and the second electric heating wire to provide different power outputs.

[0015] The present invention uses planar welding to connect the first electric heating wire and the second electric heating wire, avoiding the uneven stress distribution caused by the thickness difference between the two electric heating wires. In the welding connection method, there will be no problem that the surface of the electric heating wire at a higher position bears excessive pressing force and a contact gap is formed at a lower position, reducing the technical problems caused by uneven stress. Moreover, due to the use of welding connection, under the action of thermal stress generated during the long-term operation of the equipment, the electrical contact points are not prone to micro-displacement, thus avoiding fluctuations in contact resistance. At the same time, the separation tendency of the contact surface caused by the difference in thermal expansion coefficients of different materials is also effectively alleviated, reducing the possibility of step changes in contact resistance. The stable contact resistance makes the heating power not generate uncontrollable fluctuations, thereby ensuring the stability of the water outlet temperature of the instant heating device, improving the accuracy of constant temperature control, and providing users with a more stable and comfortable hot water usage experience. The present invention replaces mechanical connection with planar welding, solves the problems of uneven stress and contact resistance fluctuation caused by the thickness difference of electric heating wires, and significantly improves the reliability and constant temperature control accuracy of the dual-power electric heating wire heating tube. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the welded connection part of an embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of the conductive film of an embodiment of the present invention; Figure 4 It is a schematic diagram of the structure of the conductive collar of an embodiment of the present invention; Figure 5 It is a schematic diagram of the structure of the short-circuit gasket of an embodiment of the present invention; Figure 6Schematic diagram of the common - pole conductive card ring of an embodiment of the present invention.

[0017] Explanation of reference numerals: 1. Heating - tube body; 2. First heating wire; 3. Second heating wire; 4. Welding connection part; 5. First conductive card ring; 6. Second conductive card ring; 7. Common - pole conductive card ring; 71. Conductive card strip; 72. Fastener; 8. Conductive thin film; 9. Conductive collar; 10. Short - circuit gasket. Detailed implementation manners

[0018] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0019] The term "including" and its variants used herein are open - ended, that is, "including but not limited to"; the term "based on" is "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependent relationships.

[0020] It should be noted that the modification of "one" and "multiple" mentioned in the present invention is illustrative rather than restrictive. Those skilled in the art should understand that unless clearly stated otherwise in the context, it should be understood as "one or more".

[0021] As Figure 1 、 Figure 2As shown in the figure, a dual-power electric heating wire heating tube provided by an embodiment of the present invention includes a heating tube body 1, and a first electric heating wire 2 and a second electric heating wire 3 spirally wound around the outer surface of the heating tube body 1. The powers of the first electric heating wire 2 and the second electric heating wire 3 are different. One end of the first electric heating wire 2 and one end of the second electric heating wire 3 are connected by planar welding to form a welded connection portion 4. The end of the first electric heating wire 2 away from the welded connection portion 4 is used to connect to a first conductive retaining ring 5, and the end of the second electric heating wire 3 away from the welded connection portion 4 is used to connect to a second conductive retaining ring 6. The welded connection portion 4 is used to connect to a common-pole conductive retaining ring 7. The first conductive retaining ring 5 and the second conductive retaining ring 6 respectively constitute independent current input ends, and the common-pole conductive retaining ring 7 constitutes a common output end of the current.

[0022] Specifically, the heating tube body 1 serves as the basic support structure of the entire heating tube, providing a carrier for the winding of the first heating wire 2 and the second heating wire 3. Its material has good thermal conductivity and high-temperature resistance to ensure that heat can be effectively transferred to the medium to be heated. The first heating wire 2 and the second heating wire 3 are spirally wound on the outer surface of the heating tube body 1. The first heating wire 2 is spirally wound on one side of the heating tube body 1, and the second heating wire 3 is spirally wound on the other side of the heating tube body 1. The spiral winding method can increase the contact area between the heating wire and the heating tube body 1 and improve the heat conduction efficiency. The powers of the first heating wire 2 and the second heating wire 3 are different, and the power difference can be achieved by selecting different materials, diameters, or winding densities, etc., so that the heating tube can select heating wires with different powers according to actual needs to work to meet diverse heating scenarios. One end of the first heating wire 2 and the second heating wire 3 located in the middle of the heating tube body 1 is connected by planar welding to form a welded connection part 4. The two sections of heating wires are firmly combined together by using the welding process to ensure the reliability and stability of electrical contact. During the welding process, by controlling welding parameters such as welding temperature and welding time, a good metallurgical bond is formed at the welding part to reduce the contact resistance. The first conductive collar 5 is connected to the end of the first heating wire 2 away from the welded connection part 4 and serves as the current input end of the first heating wire 2. Its material is a metal with good electrical conductivity, such as copper, etc., to ensure that current can be smoothly input into the first heating wire 2. The second conductive collar 6 is connected to the end of the second heating wire 3 away from the welded connection part 4 and serves as the current input end of the second heating wire 3. Similar to the first conductive collar 5, it ensures that current can be stably input into the second heating wire 3. The common pole conductive collar 7 is connected at the welded connection part 4 and serves as the common output end of the current, collecting and outputting the current generated by the first heating wire 2 and the second heating wire 3. It has good current-carrying capacity and heat dissipation performance to ensure that problems such as overheating will not occur during long-term operation. When the first heating wire 2 needs to be used for work, the current is input from the first conductive collar 5, passes through the first heating wire 2, and then is output from the common pole conductive collar 7; when the second heating wire 3 needs to be used for work, the current is input from the second conductive collar 6, passes through the second heating wire 3, and then is output from the common pole conductive collar 7; when both the first heating wire 2 and the second heating wire 3 need to be used for work simultaneously, the current is input from the first conductive collar 5 and the second conductive collar 6 respectively, passes through the corresponding heating wires, and is output from the common pole conductive collar 7 to achieve dual-power heating.

[0023] In this embodiment, the first heating wire 2 and the second heating wire 3 are connected by planar welding, which avoids the problem of uneven stress distribution caused by the thickness difference between the two heating wires. During the welding connection process, the two heating wires can form uniform contact at the connection part, and there will be no situation where the surface of the heating wire at a higher position bears excessive pressing force and a contact gap is formed at a lower position, thereby reducing the technical problems caused by uneven stress. Since welding connection is adopted, during the long-term operation of the equipment, it will not be prone to micro-displacement due to the action of thermal stress like the bolt fastening method, ensuring the stability of the electrical contact point, making the contact resistance not easy to fluctuate, and further maintaining the stability of the heating power and improving the constant temperature control accuracy of the water outlet temperature of the instant heating device. The welding connection method reduces the tendency of the contact surface to separate due to the difference in the thermal expansion coefficients of different materials, reduces the possibility of a step change in the contact resistance, further ensures the stability and reliability of the heating tube operation, and extends the service life of the equipment.

[0024] Optionally, a conductive connection layer is provided on the outer surface of the heating tube body 1 at the welding connection part 4, and both the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4 are electrically connected to the conductive connection layer; the common pole conductive retaining ring 7 is electrically connected to the conductive connection layer.

[0025] Specifically, a conductive connection layer is provided at the welded connection part 4 on the outer surface of the heating tube body 1. The first heating wire 2 and the second heating wire 3 are electrically connected to the conductive connection layer on both sides of the welded connection part 4. At the same time, the common pole conductive collar 7 is also electrically connected to the conductive connection layer. In this way, the conduction path of the current is changed. The current that originally needed to pass through the welded joint now first conducts from the first heating wire 2 or the second heating wire 3 to the conductive connection layer, and then from the conductive connection layer to the common pole conductive collar 7, thus avoiding the current directly passing through the welded joint. Through the conductive connection layer, a new current transmission path is constructed, skillfully avoiding the welded joint, and enabling the current to bypass the welded part where there may be unstable factors for transmission. The conductive connection layer can be made of metal materials with excellent electrical conductivity, such as copper, silver, etc., or alloys made of these metals. These materials have low resistivity, high electrical conductivity, and good corrosion resistance, and can maintain stable electrical conductivity in a high-temperature environment to ensure the smooth transmission of current. The conductive connection layer is provided at the welded connection part 4 on the outer surface of the heating tube body 1, and its shape can be designed according to the shape of the welded connection part 4 and the layout of the first heating wire 2 and the second heating wire 3. Generally speaking, the conductive connection layer should cover the welded connection part 4 and a certain range of areas on both sides to ensure that both the first heating wire 2 and the second heating wire 3 can be in full contact with the conductive connection layer. For example, the conductive connection layer can be designed in shapes such as annular, sheet-like, etc., and the specific shape depends on the actual requirements and installation space. The conductive connection layer can be made on the outer surface of the heating tube body 1 by electroplating, spraying, welding, etc. The electroplating process can form a uniform and dense conductive layer on the heating tube surface; the spraying process is suitable for the production of large-area conductive layers; the welding process can weld the pre-made conductive sheet on the heating tube surface. The connection between the first heating wire 2 and the second heating wire 3 and the conductive connection layer can be made by welding, crimping, riveting, etc. The welding method can ensure a firm metallurgical bond between the heating wire and the conductive connection layer, with high connection strength and stability; the crimping method is simple to operate, convenient for installation and disassembly, and is suitable for occasions where the heating wire needs to be frequently maintained or replaced; the riveting method can provide a reliable mechanical connection while ensuring good electrical contact. The connection between the common pole conductive collar 7 and the conductive connection layer is usually made by bolt fastening or welding. The bolt fastening method can ensure good contact between the common pole conductive collar 7 and the conductive connection layer by adjusting the fastening force of the bolt, and is convenient for later disassembly and maintenance; the welding method can provide a more reliable electrical connection, but it is relatively difficult to disassemble after installation, and is suitable for occasions where extremely high reliability of the electrical connection is required and frequent disassembly is not needed.

[0026] In this alternative embodiment, there may be some potential problems at the welding connection, such as uneven welding quality, and the welded part may undergo slight changes due to factors such as thermal stress during long-term use. These problems may lead to unstable contact resistance, thereby affecting current transmission. Therefore, in this embodiment, by setting up a conductive connection layer and making the current bypass the welding connection, the direct action of the current on the welded part is reduced, the risk of abnormal current transmission caused by problems at the welding connection is lowered, and the stability of current transmission is improved. Since the current mainly transmits between the conductive connection layer and the common electrode conductive collar 7, the conductive connection layer has a large contact area and good electrical conductivity, and can provide a more stable and reliable electrical connection. Compared with directly relying on the welding connection for current transmission, the reliability of the electrical connection of the entire electric heating wire heating tube is greatly enhanced, and equipment failures caused by electrical connection problems are reduced. Moreover, when the current passes through the conductive connection layer, it can be transmitted with a lower resistance, improving the current transmission efficiency, enabling more electrical energy to be converted into heat energy, and enhancing the heating efficiency of the heating tube. Also, it avoids frequent impacts of the current on the welding connection and possible problems such as electrochemical corrosion, reducing the loss and aging rate of the welding connection. At the same time, stable current transmission also helps to protect the first heating wire 2 and the second heating wire 3, enabling them to operate in a more stable working environment, thereby extending the service life of the entire dual-power electric heating wire heating tube. In addition, the presence of the conductive connection layer provides a more flexible way for the installation of the common electrode conductive collar 7. During the installation process, it only needs to ensure good contact between the common electrode conductive collar 7 and the conductive connection layer, reducing the installation difficulty. Also, if there are electrical connection problems during use, it is easier to inspect and repair the conductive connection layer or the common electrode conductive collar 7, improving the maintainability of the equipment.

[0027] Optionally, as Figure 3 shown, the conductive connection layer is a conductive thin film 8 coated on the surface of the heating tube body 1, and the conductive thin film 8 is conductor silver paste.

[0028] Specifically, a conductive film 8 is coated on the outer surface of the heating tube body 1 at the welded connection part 4. The first heating wire 2 and the second heating wire 3 located on both sides of the welded connection part 4 are both covered at the conductive film 8 and electrically connected to the conductive film 8. The conductive film 8 is electrically connected to the common electrode conductive retaining ring 7. When the first heating wire 2 and the second heating wire 3 contact the conductive film 8 on both sides of the welded connection part 4, due to the good conductivity of the conductive silver paste, the current can smoothly conduct from the heating wire to the conductive film 8. At the same time, the common electrode conductive retaining ring 7 is also electrically connected to the conductive film 8, and the current then conducts from the conductive film 8 to the common electrode conductive retaining ring 7, forming a complete current loop to achieve the purpose of avoiding the conduction of the current through the welded connection part 4. The conductive silver paste is a mixture composed of silver powder, organic carrier, additives, etc. After specific process treatment, it has good conductivity, adhesion and coatability. In the actual production process, coating processes such as screen printing, spraying, dip coating, etc. can be used to evenly coat the conductive silver paste at the position of the welded connection part 4 on the surface of the heating tube body 1. By controlling the parameters of the coating process, such as coating speed, coating thickness, drying temperature and time, etc., the quality and performance of the conductive film 8 can be ensured. For example, the screen printing process can achieve high-precision coating and can accurately control the shape and size of the conductive film 8; the spraying process is suitable for large-area coating and has high production efficiency. The thickness of the conductive film 8 is reasonably designed according to factors such as the power requirement of the heating tube, the magnitude of the current, and the conductive performance of the conductive silver paste. Generally speaking, a thicker conductive film 8 can provide better conductive performance, but it will also increase the cost and weight; a thinner conductive film 8 may not meet the requirements of current conduction. At the same time, in order to ensure the uniformity of current conduction, the thickness of the conductive film 8 should be kept as consistent as possible to avoid local over-thickness or under-thickness. During the production process, the thickness and uniformity of the conductive film 8 can be detected and controlled through quality inspection means.

[0029] In this alternative embodiment, the conductive silver paste is a material with excellent electrical conductivity, having a low resistivity, which can effectively reduce the loss of current during conduction and improve the electrical energy utilization efficiency of the heating tube. Compared with some other conductive materials, the conductive silver paste can provide a smoother conduction path for the current, ensuring the stability and reliability of the heating tube during dual-power output. Using a coating process to form the conductive film 8 made of the conductive silver paste on the surface of the heating tube body 1 has high flexibility. According to the specific shape, size and design requirements of the heating tube, the coating position, thickness and shape of the conductive film 8 can be precisely controlled, enabling the conductive film 8 to better adapt to different specifications and types of heating tubes and meet diverse production requirements. And through the coating process, the conductive silver paste can be tightly combined with the surface of the heating tube body 1 to form a firm conductive film 8, ensuring that the conductive film 8 is not easily detached or damaged during the long-term use of the heating tube, improving the stability and service life of the conductive film 8, and thus ensuring the reliability and safety of the entire heating tube. Moreover, compared with some precious metal materials (such as pure silver), the conductive silver paste has a lower cost but can still provide good electrical conductivity. On the premise of ensuring the performance of the heating tube, using the conductive silver paste as the material for the conductive film 8 can reduce production costs and improve the market competitiveness of the product.

[0030] Optionally, as Figure 4 shown, the conductive connection layer is a conductive sleeve ring 9 sleeved on the outer surface of the heating tube body 1.

[0031] Specifically, the conductive connection layer is sleeved on the outer surface of the heating tube body 1 in the form of a conductive collar 9. The first heating wire 2 and the second heating wire 3 are electrically connected to the conductive collar 9 on both sides of the welding connection part 4, and the common pole conductive collar 7 is also electrically connected to the conductive collar 9. When current is input into the first heating wire 2 or the second heating wire 3, the current first conducts to the conductive collar 9 and then conducts from the conductive collar 9 to the common pole conductive collar 7, forming a complete current loop, thus achieving the purpose of avoiding the conduction of current through the welding connection part 4. The conductive collar 9 can be made of metal materials with good electrical conductivity and mechanical strength such as copper and aluminum. Copper has excellent electrical and thermal conductivity and can meet the requirements of large current conduction; aluminum has the advantages of light weight and low cost and can also be used in some occasions where the requirements for electrical conductivity are not particularly stringent. In addition, according to actual needs, surface coating treatment such as silver plating and tin plating can be carried out on the metal material to improve the electrical conductivity and corrosion resistance of the conductive collar 9. The inner diameter of the conductive collar 9 is slightly smaller than the outer diameter of the heating tube body 1 and is sleeved on the heating tube body 1 through a certain elastic deformation to ensure close contact between the two. At the same time, corresponding connection parts such as card slots and threaded holes are provided on the conductive collar 9 for connection with the heating wire and the common pole conductive collar 7. For example, two card slots are provided on the conductive collar 9 for fixing the ends of the first heating wire 2 and the second heating wire 3 respectively; a threaded hole is provided on one side of the conductive collar 9 for connecting the common pole conductive collar 7. The outer diameter and inner diameter dimensions of the conductive collar 9 should ensure that the conductive collar 9 can be smoothly sleeved on the heating tube body 1 and match the connection parts with the heating wire and the common pole conductive collar 7; the thickness of the conductive collar 9 should be reasonably selected according to the requirements of electrical conductivity and mechanical strength, ensuring sufficient electrical conductivity while avoiding excessive thickness resulting in increased costs and installation difficulties. In addition to being sleeved on the outer surface of the heating tube body 1, the conductive collar 9 can also be arranged in an embedded manner.

[0032] In this alternative embodiment, the conductive collar 9 can be pre-fabricated and directly sleeved on the heating tube body 1 during the assembly process of the heating tube, and then connected to the first heating wire 2, the second heating wire 3, and the common electrode conductive collar 7. Compared with some forms of conductive connection layers that require complex coating processes, the installation process of the conductive collar 9 is simpler and faster, which can improve production efficiency and reduce production costs. Since the conductive collar 9 is independently sleeved on the heating tube body 1, when it is necessary to maintain, repair, or replace the conductive collar 9 of the heating tube, the conductive collar 9 can be conveniently disassembled without the need to disassemble the entire heating tube on a large scale, which improves the maintainability of the heating tube and extends the service life of the heating tube. The conductive collar 9 can be customized according to the size and shape of the heating tube body 1, and can adapt to different specifications and types of heating tubes. Whether the heating tube body 1 is circular, square, or of other special shapes, a conductive collar 9 that matches it can be designed, which has good versatility and adaptability.

[0033] Optionally, as Figure 5 shown, a shorting gasket 10 is provided between the welding connection part 4 and the common electrode conductive collar 7, and the shorting gasket 10 is in close contact with the welding connection part 4 and the common electrode conductive collar 7 respectively.

[0034] Specifically, a shorting gasket 10 is added between the welding connection part 4 and the common pole conductive collar 7. The shorting gasket 10 is in close contact with the welding connection part 4 and the common pole conductive collar 7 respectively. In this way, after the current converges from the first heating wire 2 and the second heating wire 3 to the welding connection part 4, it is conducted to the common pole conductive collar 7 through the shorting gasket 10, forming a complete current loop. The shorting gasket 10 plays the role of an intermediate bridge, optimizing the conduction path of the current from the welding connection part 4 to the common pole conductive collar 7 and ensuring that the current can pass through stably and smoothly. The shorting gasket 10 can be made of metal materials such as copper, silver, aluminum, or composite materials composed of these metal materials and other alloy components. Copper has good electrical conductivity and thermal conductivity and relatively low cost, which is a commonly used choice; silver has the best electrical conductivity, but the cost is high and it can be used in some occasions with extremely high requirements for electrical conductivity; aluminum has the advantage of light weight and can be considered in some scenarios with requirements for weight. In addition, surface coating treatment such as nickel plating, tin plating, etc. can be carried out on the shorting gasket 10 to improve its corrosion resistance and oxidation resistance. The shape of the shorting gasket 10 can be designed according to the shapes of the welding connection part 4 and the common pole conductive collar 7. Common shapes include circular, square, oval, etc. Its size should match the contact parts of the welding connection part 4 and the common pole conductive collar 7 to ensure close contact. For example, if the contact surface of the welding connection part 4 and the common pole conductive collar 7 is circular, the shorting gasket 10 can be designed as a circular gasket, and its diameter should be slightly larger than the diameter of the contact surface to ensure sufficient contact area. At the same time, the thickness of the shorting gasket 10 also needs to be reasonably selected according to actual needs. It is necessary to ensure sufficient mechanical strength and avoid being too thick, which may cause installation difficulties or affect the overall structure. The shorting gasket 10 can be tightly connected to the welding connection part 4 and the common pole conductive collar 7 by means of crimping, welding, riveting, etc. The crimping method is simple to operate, can quickly achieve connection, and is convenient for disassembly; the welding method has a firm connection and good electrical conductivity, but is relatively difficult to disassemble; the riveting method has high mechanical strength and is suitable for occasions with high requirements for connection strength. In practical applications, the appropriate installation method can be selected according to specific situations.

[0035] In this alternative embodiment, the short - circuit gasket 10 is made of a material with good electrical conductivity, such as metals or their alloys like copper and silver. Compared with directly relying on the welded connection part 4 to contact and conduct current with the common - pole conductive collar 7, the short - circuit gasket 10 can provide a larger contact area and a more stable conductive path, effectively reducing the contact resistance, reducing the loss of current during conduction, improving the power utilization efficiency, and ensuring the stability and accuracy of the heating - tube power output. During actual use, the heating tube is affected by factors such as vibration, thermal expansion and contraction, which may cause the contact between the welded connection part 4 and the common - pole conductive collar 7 to become loose. The setting of the short - circuit gasket 10 increases the connection level and contact area between the two, can buffer the influence brought by these external factors to a certain extent, enhance the reliability of the connection, reduce problems such as abnormal heating and power fluctuation caused by poor contact, and extend the service life of the heating tube. And the short - circuit gasket 10 can be used as an independent component and can be easily installed between the welded connection part 4 and the common - pole conductive collar 7 during the assembly of the heating tube. When maintenance or component replacement of the heating tube is required, the short - circuit gasket 10 can also be relatively easily disassembled and replaced, reducing the maintenance cost and difficulty. Moreover, the short - circuit gasket 10 can select appropriate materials and sizes according to different working environments and requirements. For example, in a high - temperature environment, a material with good high - temperature resistance can be selected; in the case of requiring larger current conduction, a short - circuit gasket 10 with a larger cross - sectional area can be selected to adapt to different working conditions and improve the versatility and adaptability of the heating tube.

[0036] Optionally, as Figure 6 shown, the common - pole conductive collar 7 includes two parallel conductive strips 71. One ends of the two conductive strips 71 are respectively crimped on the surfaces of the first heating wire 2 and the second heating wire 3 on both sides of the welded connection part 4, and the other ends of the two conductive strips 71 are fixedly connected through a fastener 72.

[0037] Specifically, the common pole conductive card ring 7 is composed of two parallel conductive card strips 71. During installation, one end of each of the two conductive card strips 71 is respectively crimped on the surfaces of the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4. This crimping method enables the first heating wire 2 and the second heating wire 3 to be separately stressed at the connection, avoiding problems such as damage to the heating wire or unstable connection caused by concentrated stress. At the same time, after the current is conducted from the first heating wire 2 and the second heating wire 3 to the conductive card strips 71 crimped thereto, since the other ends of the two conductive card strips 71 are fixedly connected by fasteners 72, a complete conductive path is formed, and the current is directly conducted between the conductive card strips 71, bypassing the welding connection part 4, thereby achieving the purpose of the current not flowing through the welding connection part 4 and ensuring the stability and reliability of current conduction. The conductive card strip 71 is made of a metal material with high conductivity, such as copper and brass. Copper has excellent electrical conductivity and thermal conductivity, which can meet the requirements of large current conduction; brass has better mechanical strength and corrosion resistance and can be used in some occasions where strength and corrosion resistance are required. In addition, other suitable conductive alloy materials can also be selected according to actual needs. The conductive card strip 71 has good electrical conductivity, and its resistivity should be as low as possible to reduce the loss during current conduction. At the same time, it also has certain mechanical strength and toughness, can withstand various stresses during installation and use, and is not easily deformed or broken. The conductive card strip 71 is generally strip-shaped, and its cross-sectional shape can be rectangular, circular or other suitable shapes. The conductive card strip 71 with a rectangular cross-section is convenient for processing and installation and can provide a large contact area; the conductive card strip 71 with a circular cross-section may have better mechanical properties in some specific cases. The length of the conductive card strip 71 is designed according to the specific size of the heating tube and the position of the heating wire to ensure sufficient contact with the heating wire and achieve electrical connection. The width and thickness need to be reasonably selected according to the current magnitude and mechanical strength requirements. Generally speaking, the larger the current, the greater the width and thickness of the conductive card strip 71 should be to ensure sufficient electrical conductivity and mechanical strength. The conductive card strip 71 is crimped using special crimping tools, such as crimping pliers, crimping machines, etc., which can provide precise pressure and crimping depth to ensure good electrical connection between the conductive card strip 71 and the heating wire. The fastener 72 can be a bolt, nut, rivet, etc. The combination of a bolt and a nut has the advantages of firm connection and detachable, and is suitable for occasions where components need to be frequently maintained or replaced; rivet connection has the advantages of simple structure and low cost and is suitable for occasions where the connection strength requirement is not particularly high and does not need to be frequently disassembled. If bolts and nuts are used, through holes should be provided at the other ends of the two conductive card strips 71, and the bolts are passed through the through holes and tightened with nuts. Attention should be paid to the appropriate tightening force when tightening the nuts to avoid deformation or damage to the conductive card strip 71 caused by over-tightening. If rivets are used, holes need to be pre-punched on the conductive card strip 71, and then the rivets are riveted in the holes through riveting equipment to ensure firm riveting.The material of the fastener 72 has good mechanical properties and corrosion resistance, such as stainless steel, carbon steel, etc. The stainless steel fastener 72 has excellent corrosion resistance and is suitable for humid and corrosive environments; the carbon steel fastener 72 has higher strength and lower cost and can be used in some occasions with low requirements for corrosion resistance.

[0038] In this alternative embodiment, the first heating wire 2 and the second heating wire 3 are stressed separately, effectively reducing the risk of the heating wire breaking, deforming or the welding connection part 4 becoming loose or damaged due to excessive local stress, extending the service life of the heating wire and the welding connection part 4, and improving the reliability and stability of the heating tube. The current does not flow through the welding connection part 4, avoiding the influence of problems such as contact resistance and welding defects that may exist in the welding connection part 4 on current conduction, reducing the loss of current during conduction, improving the power utilization efficiency of the electric energy, and ensuring the stability and accuracy of the power output of the heating tube. The two conductive strips 71 are arranged in parallel and fixedly connected by the fastener 72, forming a stable structure that can withstand a certain amount of mechanical stress and thermal stress, maintaining a stable electrical connection during the operation of the heating tube, and reducing connection looseness or failure caused by factors such as vibration and thermal expansion and contraction. The installation method of crimping and fixing with the fastener 72 is simple in operation, reducing the maintenance cost and difficulty.

[0039] Optionally, the common - pole conductive collar 7 has a middle convex part and inclined side walls extending to both sides; the middle convex part is located above the welding connection part 4 and has a gap with the welding connection part 4; the inclined side walls are respectively crimped on the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4.

[0040] Specifically, the middle protrusion is located above the welding connection part 4 and there is a gap with the welding connection part 4, which avoids direct contact between the conductive collar and the welding connection part 4, so that the current does not flow directly through the welding connection part 4. The inclined side walls are respectively crimped on the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4, and the current is conducted from the first heating wire 2 and the second heating wire 3 to the inclined side walls, and then the current is collected and conducted through the conductivity of the conductive collar itself, forming a complete current loop, thereby providing electric energy for the heating tube. The common pole conductive collar 7 is an integral structure, and the middle protrusion and the inclined side wall are firmly connected without obvious gaps or defects. The conductive collar can be manufactured by an integrated molding process, such as stamping, casting, etc., to ensure the stability and reliability of its structure. During installation, the inclined side walls of the conductive collar are aligned with the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4, and then a certain pressure is applied to make the inclined side walls tightly crimped with the heating wires. A special installation tool can be used for installation to ensure that the crimping force is moderate to avoid damaging the heating wires. After installation, check whether the connection between the conductive collar and the heating wire is firm, loose or in poor contact. The shape of the middle raised portion can be circular, square or other suitable shapes, and its size can be reasonably designed according to the size and position of the welding connection portion 4 to ensure that there is enough gap between the welding connection portion 4. Generally, the gap distance can be between 0.5-5 mm, and the specific value can be determined by experiment according to the actual situation. The inclination angle between the inclined side wall and the horizontal plane is generally between 30°-60°, which can not only ensure that the inclined side wall has enough contact area with the heating wire, but also enable the conductive collar to have certain stability and flexibility during installation and use. The specific inclination angle can be adjusted according to factors such as the diameter, material and installation space of the heating wire. The length of the inclined side wall can cover the part of the first heating wire 2 and the second heating wire 3 that contacts the conductive collar, ensuring that there is a good electrical connection between the heating wire and the common pole conductive collar 7. The width can be designed according to the current size and mechanical strength requirements. Generally speaking, the larger the current, the width of the inclined side wall should be increased accordingly to ensure sufficient conductivity and mechanical strength.

[0041] In this optional embodiment, the gap between the middle raised portion and the welding connection portion 4 prevents the current from flowing directly through the welding connection portion 4, reduces the heat accumulation and possible welding defects caused by the current passing through the welding connection portion 4, reduces the risk of damage to the welding connection portion 4, and extends the service life of the welding connection portion 4 and the entire heating tube. The inclined side wall is crimped onto the first heating wire 2 and the second heating wire 3, so that the force on the heating wire is more uniform and dispersed, avoiding the breakage or deformation of the heating wire caused by excessive local force, ensuring the stability and reliability of the heating wire, and thus ensuring the normal operation of the heating tube.

[0042] Optionally, the common-pole conductive card ring 7 includes a C-shaped base body, a first floating conductive block and a second floating conductive block provided at both ends of the opening of the base body; a spring cavity is provided in the base body, and an elastic member is provided in the spring cavity; both the first floating conductive block and the second floating conductive block are connected to the elastic member on the side facing the spring cavity, and the sides of the first floating conductive block and the second floating conductive block away from the spring cavity are respectively pressed against the surfaces of the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4; a back plate extending axially is provided on the base body, and the back plate is used for connecting with the end cover of the heating tube body 1.

[0043] Specifically, in the common - pole conductive card ring 7, the C - shaped base body serves as an overall support structure. A spring cavity is provided inside and an elastic member is placed therein. The first floating conductive block and the second floating conductive block are respectively located at both ends of the base body opening, and one side of each is connected to the elastic member. When the conductive card ring is installed, under the elastic force of the elastic member, the sides of the first floating conductive block and the second floating conductive block away from the spring cavity will respectively press against the surfaces of the first heating wire 2 and the second heating wire 3 on both sides of the welding connection part 4, forming a reliable electrical connection. The elastic member can automatically adjust the pressing force of the floating conductive block according to the position and surface condition of the heating wire to ensure good contact. The axially - extending back plate provided on one side of the base body is used to connect with the end cover of the heating tube body 1. Through this connection method, the common - pole conductive card ring 7 is fixed on the heating tube, enabling the entire common - pole conductive card ring 7 to maintain a stable position during the operation of the heating tube and ensuring the continuity of current conduction. The shape of the C - shaped base body conforms to the overall structure and installation requirements of the heating tube. The opening size and bending radius are reasonably designed according to the dimensions of the first floating conductive block and the second floating conductive block and the position of the heating wire. The inner wall of the base body is smooth to avoid hindering the movement of the floating conductive block. The C - shaped base body is made of metal materials with good mechanical strength and electrical conductivity, such as stainless steel, copper alloy, etc. Stainless steel has excellent corrosion resistance and mechanical strength and is suitable for various harsh environments; copper alloy has good electrical conductivity and thermal conductivity and can meet the requirements of current conduction. The spring cavity is set at a suitable position inside the C - shaped base body, and its shape and size should match the elastic member to ensure that the elastic member can freely expand and contract in the cavity. The opening of the spring cavity corresponds to the position of the floating conductive block for connecting the elastic member with the floating conductive block. The elastic member can be a spring, a spring sheet, a set of disc springs, etc., which can provide sufficient pressing force without damaging the heating wire due to excessive pressing force. The first floating conductive block and the second floating conductive block have good electrical conductivity and mechanical strength. Their shapes can be cuboids, cylinders, etc., and the surfaces should be smooth and flat for good contact with the heating wire and the elastic member. A connection part for connecting with the elastic member is provided on one side of the conductive block, and the connection method can be welding, riveting, etc. The back plate should extend axially along the C - shaped base body, and its length and width are designed according to the dimensions and connection requirements of the end cover of the heating tube body 1. The thickness of the plate is sufficient to ensure the firmness of the connection. The connection method between the back plate and the end cover of the heating tube body 1 can be bolt connection, riveting, welding, etc. If bolt connection is used, corresponding through - holes should be provided on the plate and the end cover, and appropriate bolts and nuts should be used for fastening. During connection, it should be ensured that the connection is firm without looseness.

[0044] In this alternative embodiment, the presence of the elastic member enables the first floating conductive block and the second floating conductive block to adaptively press against the heating wire. Even if there are minor irregularities or position deviations on the surface of the heating wire, the floating conductive blocks can closely fit under the action of the elastic member, effectively reducing the contact resistance, improving the stability and reliability of current conduction, and reducing problems such as uneven heating or power loss caused by poor contact. During the operation of the heating tube, it may be affected by factors such as vibration, thermal expansion and contraction, etc. The elastic member can play a role in buffering and shock absorption, absorbing part of the vibration energy, reducing the impact on the heating wire and the conductive retaining ring, protecting the heating wire and the conductive retaining ring from damage, and extending the service life. The connection method between the back plate and the end cover of the heating tube body 1 is simple and easy to implement, facilitating the installation of the common electrode conductive retaining ring 7 on the heating tube. At the same time, when maintenance or component replacement is required, it is also convenient to disassemble the conductive retaining ring, reducing the maintenance cost and difficulty.

[0045] Optionally, conductive columns are provided on one side of the first floating conductive block and the second floating conductive block facing the spring cavity. One end of the conductive column extends into the spring cavity and is slidably connected to the base body, and one end of the elastic member is sleeved on the outer periphery of the conductive column.

[0046] Specifically, when the conductive retaining ring is installed, the elastic member is in a compressed or pre-compressed state, and its elastic force acts on the conductive column, causing the conductive column to drive the floating conductive block to move towards the heating wire direction, so that the floating conductive block presses against the surface of the heating wire on both sides of the welded connection part 4 to form an electrical connection. Since the conductive column is slidably connected to the base body, under the action of the elastic force of the elastic member, the conductive column can stably move along the established sliding direction, ensuring that the floating conductive block accurately presses against the heating wire. At the same time, the sliding connection also allows the conductive column to have a certain space for adaptive adjustment when subjected to external forces (such as stress caused by vibration, thermal expansion and contraction), reducing structural damage or poor contact caused by external forces. The current is conducted from the floating conductive block through the conductive column and then forms a complete current loop through the base body to supply power to the heating tube. The sliding connection between the conductive column and the base body can adopt various methods, such as linear bearing cooperation, guide rail cooperation, etc. If linear bearing cooperation is adopted, a suitable linear bearing should be installed on the base body, and the conductive column passes through the linear bearing to achieve sliding connection; if guide rail cooperation is adopted, a guide rail should be provided on the base body, and a corresponding slider or guiding structure should be provided on the conductive column so that the conductive column can slide along the guide rail. The sliding fit method should ensure that the conductive column can slide freely and smoothly and has a certain clearance to adapt to dimensional changes caused by factors such as thermal expansion and contraction. In order to prevent the conductive column from falling off the base body during the sliding process, a corresponding limiting structure should be provided. For example, a limiting boss or retaining ring is provided at the end of the conductive column, and a corresponding limiting groove or stop block is provided on the base body to limit the sliding stroke of the conductive column.

[0047] In this alternative embodiment, the sliding connection between the conductive post and the base provides precise guidance for the floating conductive block, enabling it to accurately crimp onto the heating wire along a predetermined direction. This reduces the problem of poor contact caused by the offset of the floating conductive block, improves the accuracy and stability of the electrical connection, and ensures the reliability of current conduction. The arrangement of the conductive post increases the current conduction path and contact area, reduces the resistance of the current during conduction, improves the current conduction efficiency, and enables the heating tube to more efficiently convert electrical energy into heat energy.

[0048] Optionally, the base is provided with a U-shaped stress groove in the region between the first floating conductive block and the second floating conductive block.

[0049] Specifically, when the heating tube is operating, due to factors such as temperature changes, heat generated by current passing through, and external mechanical vibrations, the base and the floating conductive block are subjected to various stresses. The presence of the U-shaped stress groove changes the stress distribution state of the base in this region. When the stress is transmitted to the position of the U-shaped stress groove, the stress will disperse and relieve at the edge and inside of the groove. The special shape of the U-shaped groove enables the stress to be distributed along the contour of the groove, avoiding excessive stress concentration in a certain local area, thereby reducing damage conditions such as deformation and cracking of the base caused by stress concentration. At the same time, the U-shaped stress groove also provides a certain amount of space allowance for the floating conductive block to make small movements under the elastic force of the elastic member, enabling the floating conductive block to better adapt to dimensional changes caused by factors such as thermal expansion and contraction and maintain good contact with the heating wire.

[0050] In this alternative embodiment, the U-shaped stress groove effectively disperses and relieves the stress in the region between the first floating conductive block and the second floating conductive block of the base, prevents problems such as deformation and cracking of the base caused by stress concentration, improves the structural strength and reliability of the base, and extends the service life of the conductive retaining ring.

[0051] Although the present invention is disclosed as above, the scope of protection of the present invention is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will all fall within the scope of protection of the present invention.

Claims

1. A double-power electric heating wire heating tube, characterized in that, It includes a heating tube body (1), a first heating wire (2) and a second heating wire (3) spirally wound around the outer surface of the heating tube body (1). The powers of the first heating wire (2) and the second heating wire (3) are different. One end of the first heating wire (2) is connected to one end of the second heating wire (3) by planar welding to form a welded connection part (4). The end of the first heating wire (2) away from the welded connection part (4) is used to connect a first conductive retaining ring (5), and the end of the second heating wire (3) away from the welded connection part (4) is used to connect a second conductive retaining ring (6). The welded connection part (4) is used to connect a common-pole conductive retaining ring (7). The first conductive retaining ring (5) and the second conductive retaining ring (6) respectively constitute independent current input ends, and the common-pole conductive retaining ring (7) constitutes a common current output end.

2. The double-power electric heating wire heating tube according to claim 1, characterized in that, The heating tube body (1) is provided with a conductive connection layer at the welded connection part (4). The first heating wire (2) and the second heating wire (3) on both sides of the welded connection part (4) are electrically connected to the conductive connection layer; the common-pole conductive retaining ring (7) is electrically connected to the conductive connection layer.

3. The double-power electric heating wire heating tube according to claim 2, characterized in that, The conductive connection layer is a conductive thin film (8) coated on the surface of the heating tube body (1), and the conductive thin film (8) is conductive silver paste.

4. The double-power electric heating wire heating tube according to claim 2, characterized in that The conductive connection layer is a conductive sleeve ring (9) sleeved on the outer surface of the heating tube body (1).

5. The double-power electric heating wire heating tube according to claim 1, characterized in that A shorting gasket (10) is provided between the welded connection part (4) and the common-pole conductive retaining ring (7), and the shorting gasket (10) is in close contact with the welded connection part (4) and the common-pole conductive retaining ring (7) respectively.

6. The double-power electric heating wire heating tube according to claim 1, wherein, The common-pole conductive retaining ring (7) includes two parallel conductive strips (71). One ends of the two conductive strips (71) are respectively pressed on the surfaces of the first heating wire (2) and the second heating wire (3) on both sides of the welded connection part (4), and the other ends of the two conductive strips (71) are fixedly connected by a fastener (72).

7. The double-power electric heating wire heating tube according to claim 1, characterized in that, The common-pole conductive retaining ring (7) has a middle convex part and inclined side walls extending to both sides; the middle convex part is located above the welded connection part (4) and has a gap with the welded connection part (4); the inclined side walls are respectively pressed on the first heating wire (2) and the second heating wire (3) on both sides of the welded connection part (4).

8. The double-power electric heating wire heating tube according to claim 1, characterized in that, The common electrode conductive card ring (7) includes a C-shaped base body, a first floating conductive block and a second floating conductive block provided at both ends of the opening of the base body; a spring cavity is provided in the base body, and an elastic member is provided in the spring cavity; one side of the first floating conductive block and the second floating conductive block facing the spring cavity is connected to the elastic member, and the sides of the first floating conductive block and the second floating conductive block away from the spring cavity are respectively pressed against the surfaces of the first heating wire (2) and the second heating wire (3) on both sides of the welding connection part (4); a back plate extending axially is provided on the base body, and the back plate is used for connecting with the end cover of the heating pipe body (1).

9. The double-power electric heating wire heating tube according to claim 8, characterized in that, Conductive columns are provided on one side of the first floating conductive block and the second floating conductive block facing the spring cavity. One end of the conductive column extends into the spring cavity and is slidably connected to the base body, and one end of the elastic member is sleeved on the outer periphery of the conductive column.

10. The double-power electric heating wire heating tube according to claim 8, characterized in that, A U-shaped stress groove is provided in the area of the base body between the first floating conductive block and the second floating conductive block.

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