Heating structure, heating element and manufacturing method of heating structure

Abstract

The invention provides a heating structure, a heating element and a manufacturing method. The heating structure comprises two electric heating sheets; the connecting rings are arranged at one ends of the electric heating pieces, the two electric heating pieces are connected in series through the connecting rings, and the resistance of the connecting rings is smaller than that of the electric heating pieces; the two electrode plates are arranged at the ends, away from the connecting ring, of the electric heating plates, and the two electrode plates are connected with the two electric heating plates respectively; a hollow tubular structure is formed between the two electric heating pieces and the connecting ring, and a temperature detection piece is inserted into the tubular structure. Compared with the prior art, the heating structure, the heating element and the manufacturing method provided by the invention have the advantages that heat transfer is more uniform, and the temperature can be better detected and controlled.

Description

Technical Field

[0001] This invention relates to the field of heated non-combustible atomization technology, and in particular to a heating structure, a heating element, and a method for manufacturing the heating structure. Background Technology

[0002] Heated tobacco products work by heating the tobacco in cigarettes to produce an aerosol. Compared to the traditional method of directly lighting and smoking tobacco, this method effectively reduces the production of harmful components, thereby reducing the tar and carbon monoxide produced during the high-temperature combustion of tobacco. Heated tobacco products convert nicotine in tobacco into vapor, without burning the tobacco itself, producing no ash, and resulting in lower tar content, effectively reducing the harm of secondhand smoke.

[0003] Currently, heating elements are often made of ceramic or metal materials for heat exchange with smoking materials. Common heating methods include resistance heating, magnetic induction heating, and light radiation heating. Among them, light radiation heating elements are often made by winding a circular metal wire and sealing it inside a glass cover, with the two ends of the wire extending out of the glass cover to connect to external circuitry. However, this type of heating wire dissipates the least amount of heat through its surface, bears the largest heat load per unit surface area, has low thermal efficiency, and the temperature in the central area of ​​the wound metal wire may be too high, leading to localized overheating, insufficient volatilization of tobacco substances, and incomplete release of aroma and nicotine. This structure also makes it inconvenient to insert temperature detection devices for temperature monitoring, resulting in poor temperature control of the heating element.

[0004] Therefore, there is an urgent need for a heating structure, heating element, and manufacturing method of the heating structure that can transfer heat faster and better detect and control temperature compared with existing technologies. Summary of the Invention

[0005] To address the technical problem of poor temperature control of heating elements in existing technologies, this invention provides a heating structure, a heating element, and a method for manufacturing the heating structure. Compared with existing technologies, the heat transfer is more uniform, and the temperature can be better detected and controlled.

[0006] A heating structure, comprising: Two heating elements; A connecting ring is disposed at one end of the heating element, and two heating elements are connected in series through the connecting ring. The resistance of the connecting ring is less than the resistance of the heating element. Two electrode plates are disposed at the end of the heating element away from the connecting ring, and the two electrode plates are respectively connected to the two heating elements; A hollow tubular structure is formed between the two heating elements and the connecting ring, and the tubular structure is used to insert a temperature sensing element.

[0007] Preferably, both the heating element and the electrode sheet are arc-shaped sheet structures, and the width of the electrode sheet is greater than the width of the heating element.

[0008] Preferably, the width of the heating element is 0.5 mm to 0.6 mm, and the width of the electrode sheet is 0.8 mm to 1.0 mm.

[0009] Preferably, the cross-sectional shape of the tubular structure is circular.

[0010] Preferably, the outer diameter of the tubular structure is 1.2 mm, and the wall thickness of the tubular structure is 0.05 mm to 0.1 mm.

[0011] Preferably, the total resistance of the connecting ring and the two electrode plates is 0.5Ω to 0.6Ω.

[0012] Preferably, the two heating elements are respectively disposed on both sides of the axis of the connecting ring, and the surface of the heating elements is provided with hollow areas at intervals along the length direction of the heating elements.

[0013] Preferably, the heating element extends in a spiral shape around the axis of the connecting ring in the circumferential direction.

[0014] Preferably, it further includes: A retaining ring is disposed at the end of the electrode sheet away from the heating element, and the retaining ring is used to connect the two electrode sheets.

[0015] Preferably, the connecting ring, the heating element, the electrode sheet, and the fixing ring are all integrally formed.

[0016] A heating element, comprising: The heating structure described in any of the above items; A quartz tube is coaxially mounted on the outside of the heating structure, and electrode plates protrude from the tail end of the quartz tube. There is an installation gap between the inner wall of the quartz tube and the outer surface of the heating structure. A mounting bracket fixedly fitted on the outside of the tail end of the quartz tube; A temperature measuring element, wherein the measuring end of the temperature measuring element is inserted into the heating structure, and the end of the temperature measuring element away from the measuring end protrudes from the mounting base.

[0017] Preferably, it further includes: A fixing seat is fixedly installed inside the quartz tube. The fixing seat has a mounting boss at its tail. The outer diameter of the mounting boss is smaller than the outer diameter of the fixing seat. The outer diameter of the mounting boss is adapted to the inner diameter of the connecting ring.

[0018] Preferably, the mounting base is made of alumina material.

[0019] Preferably, the mounting base is bonded to the quartz tube, the electrode plate, and the temperature measuring element using adhesive.

[0020] Preferably, the mounting base includes: A base, wherein the base is provided with mounting holes that mate with the outer diameter of the quartz tube; An annular sleeve is disposed on the base, the annular sleeve is disposed outside the mounting hole, and a glue injection cavity is formed between the annular sleeve and the quartz tube.

[0021] A method for manufacturing a heating structure as described in any one of the above claims, characterized by comprising the following steps: The strip substrate is drawn and rolled, and then welded in a protective gas environment to form a continuous tube. The continuous tube is cut according to a preset trajectory.

[0022] Compared with existing technologies, the heating structure provided by this invention includes heating elements, connecting tubes, and electrode plates. Two heating elements are provided, employing a sheet-like structure. Compared to solid heating wires in existing technologies, these heating elements have stronger radial heat radiation directionality and higher thermal efficiency. For the same resistance, the surface area of ​​the heating elements is larger, resulting in a lower surface load and allowing more heat to be transferred out, reducing heat stagnation and further improving material stability and safety. A connecting ring is located at one end of the heating elements, connecting the two heating elements in series. The resistance of the connecting ring is less than the resistance of the heating elements, thus ensuring that heating occurs through the heating elements and preventing overheating of the connecting ring. The electrode plates are located at the ends of the heating elements furthest from the connecting rings, each connected to one of the two heating elements and then to two external wires. When energized, the two heating elements heat up. A hollow tubular structure is formed between the heating elements and the connecting rings. This tubular structure is used to insert a temperature sensing element, which monitors the temperature in real time, thereby achieving precise temperature control. Therefore, compared with the prior art, the heating structure provided by the present invention has a faster heat transfer speed and can better detect and control the temperature. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the heating structure provided by the present invention; Figure 2 Another schematic diagram of the heating structure provided by the present invention; Figure 3 A schematic diagram of a strip-shaped substrate provided in this invention; Figure 4 This is a schematic diagram illustrating the drawing and winding of a strip substrate provided by the present invention. Figure 5 is a schematic diagram of a tube body provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of cutting a tube body in a preset direction according to an embodiment of the present invention, wherein, Figure 6 -a is a schematic diagram of the three-dimensional laser cutting system performing the processing; Figure 6 -b is a schematic diagram illustrating the specific steps of the three-dimensional laser cutting system. Figure 7 This is a schematic diagram of a structure in which a temperature measuring element is installed inside a heating structure, according to an embodiment of the present invention. Figure 8 for Figure 7 A structural schematic diagram of a cross-sectional view; Figure 9 This is a schematic diagram of a structure for separating electrodes of a heating element according to an embodiment of the present invention, wherein, Figure 9 -a is a schematic diagram of a structure in which a fixed ring is cut off along a cutting trajectory using a grinding wheel cutting disc; Figure 9 -b is a schematic diagram of a structure after the retaining ring of the heating element has been cut; Figure 10 A schematic diagram of a heating element provided in an embodiment of the present invention (with a positive electrode wire and a negative electrode wire). Figure 11 This is an exploded view of a heating element provided in an embodiment of the present invention; Figure 12 A schematic diagram of a mounting base provided in an embodiment of the present invention; Figure 13 This is a schematic diagram of a fixing base provided in an embodiment of the present invention.

[0025] Reference numerals: 1. Heating element; 2. Connecting ring; 3. Electrode plate; 4. Hollowed-out area; 5. Fixing ring; 11. First heating element; 12. Second heating element; 31. First electrode plate; 32. Second electrode plate; 71. Positive electrode wire; 72. Negative electrode wire; 51. Measuring end; 10. Heating structure; 20. Quartz tube; 30. Installation gap; 40. Mounting base; 50. Temperature measuring element; 60. Fixing base; 61. Mounting boss; 41. Base; 42. Mounting hole; 43. Annular sleeve; 44. Glue injection cavity; 45. Assembly hole; 80. Ceramic glue; 100. Strip substrate; 201. Pulling device; 202. Welding laser beam; 300. Tube body; 400. Three-dimensional laser cutting system; 401. First cutting trajectory; 402. Heating element cutting trajectory; 403. Electrode sheet cutting trajectory; 404. Second cutting trajectory; 500. Injector; 600. Assembly fixture; 700. Grinding wheel cutting disc; 800. Fixing ring cutting trajectory. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0028] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0029] like Figure 1 and Figure 2As shown, the present invention provides a heating structure including two heating elements 1; a connecting ring 2 disposed at one end of the heating elements 1, the two heating elements 1 being connected in series through the connecting ring 2, the resistance of the connecting ring 2 being less than the resistance of the heating elements 1; two electrode plates 3 disposed at the end of the heating elements 1 away from the connecting ring 2, and the two electrode plates 3 being respectively connected to the two heating elements 1; a hollow tubular structure is formed between the two heating elements 1 and the connecting ring 2, the tubular structure being used to insert a temperature sensing element.

[0030] Currently, heating elements for radiation heating are often made of wound metal wires sealed inside a glass enclosure, with the ends of the wires extending out to connect to external circuitry. However, this type of heating wire dissipates the least amount of heat through its surface, resulting in the highest heat load per unit surface area, low thermal efficiency, and the potential for excessively high temperatures in the central area of ​​the wound wire, leading to localized overheating, incomplete volatilization of tobacco substances, and incomplete release of aroma and nicotine. Furthermore, this structure makes it difficult to insert temperature sensors for temperature monitoring, resulting in poor temperature control of the heating element.

[0031] Compared with the prior art, the heating structure provided by the present invention includes a heating element 1, a connecting tube, and an electrode plate 3. Two heating elements 1 are provided, and each heating element 1 adopts a sheet-like structure. Compared with the solid heating wire in the prior art, it has stronger radial heat radiation directionality and higher thermal efficiency. Under the same resistance, the heating element 1 has a larger surface area. The larger effective heat dissipation area results in a lower surface load, enabling more heat to be transferred out and reducing the amount of heat stagnating on it, further improving material stability and safety. A connecting ring 2 is located at one end of the heating element 1, and the two heating elements 1 are connected in series through the connecting ring 2. The resistance of the connecting ring 2 is less than the resistance of the heating element 1. Thus, during heating, the heating is conducted through the heating element 1, preventing the connecting ring 2 from overheating. The electrode plates 3 are located at the end of the heating element 1 away from the connecting ring 2, and the two electrode plates 3 are respectively connected to the two heating elements 1. The two electrode plates 3 are connected to two external wires, and when energized, the two heating elements 1 heat up. A hollow tubular structure is formed between the heating element 1 and the connecting ring 2. This tubular structure is used to insert a temperature sensing element, which monitors the temperature in real time, thereby achieving precise temperature control. Therefore, compared with the prior art, the heating structure 10 provided by the present invention has a faster heat transfer speed and can better detect and control the temperature.

[0032] Understandably, the heating element uses a sheet-like structure. First, the sheet structure is extremely thin with a small heat capacity, resulting in a very fast thermal response. Compared to the solid heating wire in existing technologies, its preheating time is shorter, eliminating the need for users to wait for extended periods. Furthermore, the heating element can quickly cool down after power is cut off, preventing the tobacco from continuing to bake and producing off-flavors, thus enhancing safety. Second, it can adhere to the tobacco material over a large area, avoiding the problems of localized overheating (leading to tobacco carbonization) and localized underheating (leading to tobacco waste) that are common with traditional needle heaters. This results in a more stable concentration and temperature of each puff of smoke. Third, due to its short and direct heat transfer path, the tobacco material can be rapidly heated to the atomization temperature, ensuring a stable output of smoke from the first puff to the last.

[0033] Furthermore, a connecting ring 2 is positioned at one end of the two heating elements 1, and the two heating elements 1 are connected in series via the connecting ring 2. The resistance of the connecting ring 2 is less than the resistance of the heating elements 1, and the heating power of the connecting ring 2 is less than that of the heating elements 1, thus preventing overheating of the connecting ring 2 and reducing heat loss. Electrode plates 3 are positioned at the end of the heating element 1 furthest from the connecting ring 2, and the two electrode plates 3 are respectively connected to the two heating elements 1. These two electrode plates 3 are also connected to two external wires. This arrangement simplifies the installation of the heating structure.

[0034] Furthermore, a hollow tubular structure is formed between the heating element 1 and the connecting ring 2. A temperature sensing element is inserted through the tubular structure, thereby enabling more accurate acquisition of the temperature inside the tubular structure and achieving precise temperature control.

[0035] In the above structure, the connecting ring 2 in this embodiment of the invention is disposed at one end of the heating element 1, and the connection points of the two heating elements 1 and the connecting ring 2 are spaced apart, with the two heating elements 1 connected in series through the connecting ring 2. The cross-sectional shape of the connecting ring 2 can be circular, triangular, or polygonal. A circular shape is preferred.

[0036] In the above structure, as a preferred embodiment, the heating element 1 and the electrode sheet 3 in the present invention are both arc-shaped sheet structures, and the width of the electrode sheet 3 is greater than the width of the heating element 1.

[0037] Understandably, from the radial cross-section of the heating structure 10, both the electrode sheet 3 and the heating element 1 are arc-shaped structures. Along the axial direction of the heating structure 10, both the electrode sheet 3 and the heating element 1 are long, thin sheet structures. The sheet-like structure has higher lateral rigidity, which can effectively resist plastic deformation and sagging at high temperatures, thus extending its service life. In addition, under the same cross-section, the surface area of ​​the sheet is much larger than that of the round wire, which effectively reduces the heat load per unit area (surface load), making the overall operating temperature relatively lower, thereby slowing down material aging and improving its lifespan.

[0038] Furthermore, on the one hand, compared with planar sheet-shaped heating elements, arc-shaped sheet-shaped heating elements have a larger surface area opposite the smoking material, resulting in stronger radial heat radiation directionality, higher thermal efficiency, and a larger effective heat dissipation area, leading to a lower surface load. More heat is transferred out, and less heat remains on the heating wire itself, further improving material stability and safety. On the other hand, the arc-shaped sheet structure is more compact radially, with higher space utilization, which is conducive to the miniaturization design of the heating structure and easy to match with standard cigarettes.

[0039] By making the width of electrode 3 larger than that of heating element, it is easier to weld electrode 3 to wire in the future.

[0040] In one specific embodiment of the invention, the width of the heating element 1 is 0.5 mm to 0.6 mm, and the width of the electrode sheet 3 is 0.8 mm to 0.1 mm.

[0041] Furthermore, as one embodiment, the tubular structure in this invention has a circular cross-sectional shape.

[0042] Furthermore, as one specific implementation, the outer diameter of the tubular structure in this embodiment of the invention is 1.2 mm, and the thickness of the tubular structure is 0.05 mm to 0.1 mm.

[0043] It is understandable that the diameter of a light-heating element made of a solid heating wire is typically greater than 2.4 mm, while the diameter of mainstream heated tobacco products is 6.8 mm to 7.2 mm, making it difficult to insert the light-heating element into heated tobacco products using existing technologies. However, the tubular structure in this embodiment has an outer diameter of 1.2 mm, which is smaller than the diameter of existing light-heating elements, making insertion much simpler.

[0044] In the above structure, as a preferred embodiment, the total resistance of the connecting ring 2 and the two electrode plates 3 in this embodiment of the invention is 0.5Ω to 0.6Ω. After being powered on, the current flows through the heating structure 10, causing it to rapidly heat up to 550℃-600℃. The infrared radiation generated by the heating structure 10 in the 3.5μ-6.1μ band passes through the quartz tube 20 and acts directly on the tobacco matrix, achieving rapid and uniform non-contact heating.

[0045] In the above structure, as one embodiment, the heating element 1 in this embodiment of the invention extends spirally around the connecting ring 2 in the circumferential direction and along its axial direction.

[0046] Understandably, the heating element 1 has a sheet-like helical structure, which possesses excellent creep resistance and overall rigidity, maintains its shape well at high temperatures, and has a long lifespan. Furthermore, the outer surface of the sheet-like helical structure, which is much larger than its thickness, is positioned opposite the smoke-generating material, resulting in stronger radial heat radiation directionality and higher thermal efficiency.

[0047] In one specific embodiment of the invention, the width of the heating element 1 is 0.5 mm to 0.6 mm, and its spiral gap is 0.4 mm to 0.5 mm.

[0048] As another implementation, the heating element 1 in this application can also adopt other structures. Specifically, two heating elements 1 are respectively arranged on both sides of the axis of the connecting ring 2, and hollow areas 4 are provided at intervals along the length direction of the heating element 1.

[0049] It is understandable that the two heating elements 1 are connected in series through the connecting ring 2. In order to ensure that the sum of the resistance of the heating element 1 and the connecting ring 2 is within the range of 0.5Ω to 0.6Ω, and that the surface area opposite the smoke-generating material is more and more uniform, hollow areas are set at intervals along the length of the heating element 1.

[0050] More specifically, the hollowed-out area here can be a spiral groove, a rectangular groove, an irregular groove, or an M-shaped groove (such as...). Figure 2 (as shown) or any one of the N arc slots.

[0051] In the above structure, as one embodiment, the heating structure 10 in this embodiment of the invention further includes a fixing ring 5. The fixing ring 5 is disposed at the end of the electrode sheet 3 away from the heating element 1, and the fixing ring 5 is used to connect the two electrode sheets 3.

[0052] It is understandable that, since the electrode sheet 3 is an arc-shaped sheet material, in order to prevent the two electrode sheets 3 from twisting and deforming during subsequent assembly, as one embodiment of the present invention, the heating structure 10 further includes a fixing ring 5, which connects the two electrode sheets 3, and the fixing ring 5 is located at the end of the electrode sheet 3 away from the heating element 1.

[0053] More specifically, the electrode sheet 3 is fixedly disposed on both sides of the fixing ring 5.

[0054] In the above structure, as one embodiment, the connecting ring 2, heating element 1, electrode sheet 3 and fixing ring 5 in this embodiment of the invention are specifically integrally formed.

[0055] This invention discloses a heating element, such as Figure 11As shown, the device includes the aforementioned heating structure 10; a quartz tube 20 coaxially mounted on the outside of the heating structure 10, with electrode plates 3 protruding from the tail end of the quartz tube 20, and an installation gap 30 between the inner wall of the quartz tube 20 and the outer surface of the heating structure 10; a mounting base 40 fixedly mounted on the outside of the tail end of the quartz tube 20; and a temperature measuring element 50, with the measuring end 51 of the temperature measuring element 50 mounted in a preset position within the tubular structure, and the end of the temperature measuring element 50 away from the measuring end 51 protruding from the mounting base 40.

[0056] Understandably, to prevent the heating structure 10 from directly contacting the smoke-generating material, a quartz tube 20 is fitted around the outside of the heating structure 10, and there is an installation gap 30 between the inner wall of the quartz tube 20 and the heating structure 10. This prevents the heating structure 10 from directly contacting the quartz tube 20 locally, avoiding heat conduction that would first heat the wall of the quartz tube 20, affecting the heating rate, and also preventing the heating structure 10 from cracking due to uneven heating. The mounting base 40 is located on the outside of the tail of the quartz tube 20. The temperature measuring element 50 is used to measure the temperature inside the heating structure. Through temperature feedback, the heating temperature of the heating structure is adjusted, making the temperature adjustment more precise. The measuring end 51 of the temperature measuring element 50 is fitted into a preset position inside the tubular structure, and the end of the temperature measuring element 50 away from the measuring end 51 protrudes from the mounting base 40.

[0057] Because of the heating structure 10, the heating element provided by the present invention can also achieve faster heat transfer and better temperature detection and control.

[0058] Furthermore, by mounting a quartz tube 20 on the outside of the heating structure 10, direct contact between the heating structure 10 and the smoking material is avoided. After the two electrode plates 3 are energized, the current flows through the heating structure 10, causing it to rapidly heat up to 550°C to 600°C. The infrared radiation generated by the heating structure 10 in the 3.5μ to 6.1μ band passes through the quartz tube 20 and acts directly on the tobacco matrix, achieving rapid and uniform non-contact heating.

[0059] Furthermore, by using the temperature measuring element 50 to monitor the temperature of the heating structure 10 in real time and feeding it back to the external control system, precise temperature control can be achieved.

[0060] Furthermore, the quartz tube 20 exhibits excellent acid resistance, helping to prevent internal contamination of equipment. Additionally, quartz glass possesses excellent high-temperature resistance, capable of withstanding instantaneous temperatures of 1200℃ and prolonged high temperatures of 800℃ without cracking, and also remaining unbroken under rapid cooling conditions from 1100℃ to -20℃, making it suitable for operating environments with frequent start-ups and shutdowns. Its transmittance in the 2.5~5μm wavelength range is greater than 90%, especially for milky white quartz glass tubes, which exhibit even better infrared transmittance.

[0061] Furthermore, the quartz tube 20 specification has an outer diameter of 2.1mm ± 0.04mm and an inner diameter of 1.4mm ± 0.04mm, which is more compatible with the diameter of mainstream heated non-combustible cigarettes.

[0062] Furthermore, as one embodiment, the end of the quartz tube 20 away from the mounting base 40 in this embodiment of the invention is specifically a closed structure to prevent external tobacco from entering the interior of the quartz tube 20.

[0063] More specifically, the end of the quartz tube 20 away from the mounting base 40 is a tapered structure, and the outer diameter of the tapered structure gradually increases towards the mounting base 40, making it easier to insert into the cigarette.

[0064] In the above structure, as one implementation method, such as Figure 13 As shown, the heating element in this embodiment of the invention also includes a fixing seat 60, which is fixedly disposed inside the quartz tube 20. The fixing seat 60 has a mounting boss 61 at its tail end. The outer diameter of the mounting boss 61 is smaller than the outer diameter of the fixing seat 60. The outer diameter of the mounting boss 61 is adapted to the inner diameter of the connecting ring 2. The heating structure 10 is fitted on the outside of the mounting boss 61 to maintain the mounting gap 30.

[0065] It is understood that in this embodiment of the invention, the heating structure 10 is installed inside the quartz tube 20 by means of the fixing seat 60, and a uniform gap is formed between the outer surface of the heating structure 10 and the inner surface of the quartz tube 20. This can better prevent the heating structure 10 from partially contacting the quartz tube 20 and affecting the structure and heating rate of the heating structure 10 itself.

[0066] In the above structure, as one of the above methods, the fixing seat 60 in the embodiment of the present invention is disposed inside the quartz tube 20. The fixing seat 60 can be fixed by the dimensional matching between the outer diameter of the fixing seat 60 and the inner diameter of the quartz tube 20, or the fixing seat 60 and the quartz tube 20 can be fixed by a fixing structure.

[0067] In one specific embodiment of the invention, the fixing base 60 is preferably made of a high-temperature resistant material. More specifically, the fixing base 60 is preferably made of a high-temperature resistant insulating material.

[0068] In one specific embodiment of the invention, the fixing base 60 is made of aluminum oxide.

[0069] In the above structure, as one embodiment, the mounting base 40, the quartz tube 20, the electrode plate 3, and the temperature measuring element 50 are all bonded together with adhesive.

[0070] Furthermore, as a preferred embodiment, the adhesive used in this invention is specifically a high-temperature resistant inorganic adhesive.

[0071] In the above structure, as one implementation method, such as Figure 12 As shown, the mounting base 40 in this embodiment of the invention includes a base 41 and an annular sleeve 43. The base 41 is provided with a mounting hole 42 that matches the outer diameter of the quartz tube 20. The annular sleeve 43 is fixedly disposed on the base 41 and communicates with the mounting hole 42. An adhesive injection cavity 44 is formed between the annular sleeve 43 and the base.

[0072] Furthermore, the annular sleeve 43 and the base 41 are integrally formed.

[0073] Furthermore, the base 41 is also provided with an assembly hole 45 to facilitate the subsequent assembly of the heating element. More specifically, in this embodiment of the invention, the assembly hole 45 is a threaded hole.

[0074] After the base 41 is fitted onto the outside of the quartz tube 20, glue is injected into the glue injection cavity 44 using a glue injection tool. After the glue solidifies, the quartz tube 20, the base 41, the temperature measuring element 50, and the heating structure 10 are fixed.

[0075] In the above structure, as one embodiment, the mounting base 40 in this embodiment of the invention is specifically a ceramic mounting base, and the mounting base 40 is bonded to the quartz tube 20, the electrode sheet 3 and the temperature measuring element 50 by ceramic adhesive 80.

[0076] Furthermore, the present invention also provides a method for manufacturing a heating structure 10, comprising the following steps: The strip substrate 100 is drawn and rolled, and then welded in a protective gas environment to form a continuous tube. Specifically, a strip-shaped substrate 100 with a rectangular cross-section (3.768 mm long and 0.1 mm wide) (e.g.) Figure 3 The coil is drawn and rolled using a drawing device 201, and then welded using a welding laser beam 202 in a protective gas environment (e.g., Figure 4 This forms a continuous tube 300 with an outer diameter of 1.2 mm, a wall thickness of 0.1 mm, and a length of approximately 6 meters (e.g., ...). Figure 5 (The material strip 100 can be SUS316, iron-chromium-aluminum or other alloys with high resistivity and high emissivity;) The continuous tube 300 is cut according to a preset trajectory (see...). Figure 6 ); The tube 300 is cut according to a preset trajectory using a three-dimensional laser cutting system 400 to obtain the heating structure 10 described above (see...). Figure 1 ).

[0077] The manufacturing method of the heating structure 10 provided by the present invention simplifies the manufacturing process, improves production efficiency and material utilization, and reduces overall cost through an integrated molding process of "drawing and welding tube making + three-dimensional laser cutting".

[0078] In the above method, the heating structure 10 further includes a fixing ring 5, which is disposed at the end of the electrode sheet 3 away from the heating element 1, and the fixing ring 5 is used to connect the two electrode sheets 3; Specifically, such as Figure 6 As shown in -a, the continuous tube is cut according to a preset trajectory, including the following steps, such as... Figure 6 -b indicates: The first cutting trajectory 401 is perpendicular to the axial direction of the continuous tube and is used to initially cut the continuous tube. The continuous tube is radially cut through the first cutting trajectory 401 to form a processing reference.

[0079] The heating element cutting trajectory 402 is used to form two independently set first heating elements and second heating elements. There is a gap between the starting point of the heating element cutting trajectory 402 and the ending point of the first cutting trajectory 401 to form a connecting ring 2. The electrode sheet 3 is cut along the axial direction of the continuous tube 300 by a cutting trajectory 403 to form two independent first electrode sheets 31 and second electrode sheets 32. The second cutting trajectory 404 is perpendicular to the axial direction of the continuous tube 300 and is used to cut the continuous tube a second time. There is a gap between the starting point of the second cutting trajectory and the ending point of the electrode sheet 3 to form a fixing ring 5.

[0080] This invention provides a specific forming process for a double-helix heating structure. Specifically, the tube is cut using a three-dimensional laser cutting system according to a preset "double-helix laser cutting trajectory". This trajectory includes a "first cutting trajectory" for initial cutting, a "double-helix heating element cutting trajectory" for forming the helical structure, an electrode cutting trajectory for forming the electrode element 3, and a "second cutting trajectory" for final cutting and unloading.

[0081] like Figure 1 and Figure 2 As shown, the heat-generating structure 10 formed during processing includes the following key features: The first heating element 11 and the second heating element 12 have a width of 0.5-0.6 mm and a spiral gap of 0.4-0.5 mm.

[0082] Connecting ring 2: Connects and fixes the first heating element 11 and the second heating element 12, keeping the connection point circular and enhancing the connection strength.

[0083] Electrode section: The width of the first electrode plate 31 and the second electrode plate 32 is 0.8-1.0mm, which is always greater than the width of the first heating element 11 and the second heating element 12, so as to facilitate subsequent welding.

[0084] Fixing ring 5: Connects and supports the first electrode plate 31 and the second electrode plate 32 to prevent them from twisting or deforming during subsequent assembly.

[0085] Electrical parameters: The total resistance of the first heating element 11, the second heating element 12 and the connecting ring 2 connected in series is 0.5Ω-0.6Ω.

[0086] The present invention also provides a method for assembling a heating element, comprising the following steps: Preliminary assembly: Press the mounting boss 61 of the fixing base 60 into the connecting ring 2 of the heating structure, and then insert this assembly into the quartz tube 20. The electrode fixing ring 5 and at least part of the first electrode plate 31 and the second electrode plate 32 extend out of the quartz tube 20. The fixing base 60 is used to form an assembly gap between the heating structure 10 and the inner wall of the quartz tube 20, avoiding direct contact between the heating structure 10 and the quartz tube 20, and preventing the quartz tube 20 from cracking due to uneven heating.

[0087] like Figure 7 and Figure 8 As shown, positioning and fixing: the quartz tube 20 is inserted into the assembly fixture 600 and fixed. The specifications of the quartz tube 20 are an outer diameter of 2.1±0.04m and an inner diameter of 1.4±0.04m.

[0088] Temperature measuring element 50 installation: Insert the K-type thermocouple into the predetermined temperature measuring position of the heating structure 10 and fix it. The predetermined temperature measuring position is preferably the middle position of the spiral part of the heating element.

[0089] Packaging preparation: Fit the mounting base 40 onto the outside of the quartz tube 20 through the mounting hole 42.

[0090] Encapsulation with potting compound: Ceramic adhesive 80 is injected into the potting cavity 44 of the mounting base 40 using a syringe 500. After the ceramic adhesive 80 cures, a preliminary encapsulated heating element is formed.

[0091] like Figure 9 As shown. Electrode separation: Remove the pre-encapsulated heating element from the assembly fixture 600, and use an abrasive wheel cutting disc 700 to cut off the retaining ring 5 along the retaining ring cutting trajectory 800 (see...). Figure 9 -a), so that the first electrode plate 31 and the second electrode plate 32 are changed from being connected to being electrically open (see...). Figure 9 -b), at this time, the first heating element 11 and the second heating element 12 are in series.

[0092] Wire welding: The positive electrode wire 71 and the negative electrode wire 72 are laser welded onto the first electrode plate 31 and the second electrode plate 32 respectively, to complete the manufacturing of the heating element (see...). Figure 10 ).

[0093] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A heating structure, characterized in that, include: Two heating elements (1); A connecting ring (2) is provided at one end of the heating element (1), and the two heating elements (1) are connected in series through the connecting ring (2). The resistance of the connecting ring (2) is less than the resistance of the heating element (1). Two electrode plates (3) are disposed at one end of the heating element (1) away from the connecting ring (2), and the two electrode plates (3) are respectively connected to the two heating elements (1); A hollow tubular structure is formed between the two heating elements (1) and the connecting ring (2).

2. The heating structure according to claim 1, characterized in that, Both the heating element (1) and the electrode (3) are arc-shaped sheet structures, and the width of the electrode (3) is greater than the width of the heating element (1).

3. The heating structure according to claim 2, characterized in that, The width of the heating element (1) is 0.5 mm to 0.6 mm, and the width of the electrode sheet (3) is 0.8 mm to 1.0 mm.

4. The heating structure according to claim 1, characterized in that, The cross-sectional shape of the tubular structure is specifically circular.

5. The heating structure according to claim 1, characterized in that, The outer diameter of the tubular structure is 1.2 mm, and the wall thickness of the tubular structure is 0.05 mm to 0.1 mm.

6. The heating structure according to claim 1, characterized in that, The total resistance of the connecting ring (2) and the two heating elements (1) is 0.5Ω to 0.6Ω.

7. The heating structure according to claim 1, characterized in that, Two heating elements (1) are respectively disposed on both sides of the axis of the connecting ring (2). Along the length direction of the heating elements (1), the surface of the heating elements (1) is provided with hollow areas (4) at intervals.

8. The heating structure according to claim 1, characterized in that, The heating element (1) is spiral-shaped and extends along the axial direction of the connecting ring (2).

9. The heating structure according to any one of claims 1 to 8, characterized in that, Also includes: A fixing ring (5) is disposed at one end of the electrode sheet (3) away from the heating element (1), and the fixing ring (5) is used to connect the two electrode sheets (3).

10. The heating structure according to claim 9, characterized in that, The connecting ring (2), the heating element (1), the electrode sheet (3), and the fixing ring (5) are all integrally formed structures.

11. A heating element, characterized in that, include: The heating structure (10) according to any one of claims 1 to 10; A quartz tube (20) is coaxially mounted on the outside of the heating structure (10), and there is an installation gap (30) between the inner wall of the quartz tube (20) and the outer surface of the heating structure (10). A mounting base (40) is fixedly fitted on the outside of one end of the quartz tube (20); A temperature measuring element (50) is inserted into the heating structure (10) at its measuring end to detect the temperature inside the heating structure (10).

12. The heating element according to claim 11, characterized in that, Also includes: A fixing seat (60) is fixedly fitted inside the quartz tube (20). The fixing seat (60) is provided with a mounting boss (61). The outer diameter of the mounting boss (61) is smaller than the outer diameter of the fixing seat (60). The outer diameter of the mounting boss (61) is adapted to the inner diameter of the connecting ring.

13. The heating element according to claim 12, characterized in that, The mounting base (60) is made of alumina material.

14. The heating element according to claim 11, characterized in that, The mounting base (40) and the quartz tube (20), the mounting base (40) and the heating structure (10), and the heating structure (10) and the temperature measuring element (50) are all bonded together with adhesive.

15. The heating element according to claim 14, characterized in that, The mounting base (40) includes: The base (41) has a mounting hole (42) that matches the outer diameter of the quartz tube (20). An annular sleeve (43) is disposed on the base (41), the annular sleeve (43) is disposed outside the mounting hole (42), and an adhesive injection cavity (44) is formed between the annular sleeve and the base (41).

16. A method for manufacturing a heating structure according to any one of claims 1 to 10, characterized in that, Includes the following steps: The strip substrate is drawn and rolled, and then welded in a protective gas environment to form a continuous tube. The continuous tube is cut according to a preset trajectory.

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