Atomizing core composite anti-dry burning atomizing device based on multi-tcr material

Abstract

The application provides a multi-TCR material-based atomization core composite dry burning prevention atomization device, which comprises an atomization core body and a power supply control unit, the atomization core body comprises at least one first heating body and at least one second heating body, the first heating body and the second heating body have different TCR (temperature coefficient of resistance) values, the first heating body and the second heating body are independently connected to the power supply control unit respectively, and the power supply control unit is configured to independently control the working states of the first heating body and the second heating body. The second heating body is configured to determine whether dry burning occurs according to the current temperature and / or resistance value thereof. The application can realize multiple improvements of dry burning prevention function, taste and welding reliability.

Description

Technical Field

[0001] This invention relates to the field of atomization technology, specifically to a composite anti-dry-burning atomization device based on a multi-TCR material atomization core. Background Technology

[0002] The core component of an electronic cigarette atomizer is the atomizer coil. Under normal operating conditions, the atomizer coil relies on a porous wicking material to continuously deliver the atomized liquid to the surface of the heating wire. When the heating wire is energized, the liquid vaporizes near its boiling point, forming an aerosol. Once the liquid in the wicking channel is depleted or the supply is insufficient, the surface temperature of the heating wire will rise sharply, resulting in what is known as "dry burning." Dry burning not only scorches the wicking material, carbonizes the atomized liquid components, produces a noticeable odor and potentially harmful pyrolysis products, but also accelerates the oxidation of the heating wire itself, reduces its lifespan, and in severe cases, may cause localized overheating or even melting of the outer casing.

[0003] Existing anti-dry-burn solutions for atomizer coils mostly use a single NTC thermistor, which suffers from high component costs, large assembly space requirements, and complex soldering processes. Some NTC-free solutions rely on algorithms to predict dry-burning, which is highly dependent on e-liquid conditions and material consistency, resulting in a high probability of false triggering and leakage protection. When dry-burning occurs due to e-liquid depletion, the temperature of the atomizer coil's heating element rises rapidly, easily leading to burnt coils, a burnt taste, and safety risks. Another type uses a single heating wire for both heating and temperature measurement. However, a single TCR is greatly affected by e-liquid immersion, aging, oxidation, and resistance drift. The distinction between normal vaping cooling and dry-burning heating states is limited, easily leading to burnt coils, a burnt taste, and safety risks.

[0004] Therefore, it is necessary to optimize the existing structure of the composite anti-dry-burning atomization device with atomizing core. Summary of the Invention

[0005] To address the problem of low detection sensitivity in existing technologies, this invention provides a composite anti-dry-burning atomization device based on atomization core made of multiple TCR materials.

[0006] This invention relates to a composite anti-dry-burning atomizing device based on a multi-TCR material atomizing core, comprising an atomizing core body and a power supply control unit. The atomizing core body includes at least one first heating element and at least one second heating element; The first heating element and the second heating element have different resistance temperature coefficients (TCR). The first heating element and the second heating element are each independently connected to the power supply control unit; The power supply control unit is configured to independently control the working status of the first heating element and the second heating element; The second heating element is configured to determine whether dry burning has occurred based on its current temperature and / or resistance.

[0007] Furthermore, the first heating element and the second heating element are at least partially disposed on the same horizontal plane and are arranged side by side with a gap between them.

[0008] Furthermore, the TCR value of the first heating element is in the range of 10-300 ppm / ℃, which is used to provide the main heating atomization power, and the TCR value of the second heating element is in the range of 900-3500 ppm / ℃, which is mainly used for temperature sensing and preventing dry burning.

[0009] Furthermore, the ratio of the total area of ​​the first heating element to the total area of ​​the second heating element is 2-10:1.

[0010] Furthermore, both the first heating element and the second heating element are planar mesh-like in shape; The second heating element is located to the left, right, upper left, lower left, upper right, or lower right of the first heating element, or the second heating element is surrounded by the first heating element; The first heating element and the second heating element can be fitted to the inner wall of the atomizing core support, and the first heating element and the second heating element are arranged to form a columnar structure within the atomizing core support.

[0011] The invention is improved in a second way, wherein the number of the first heating elements is two or more, which are arranged in parallel at intervals along the axial direction of the atomizing core support, and the number of the second heating elements is one, with the first heating elements arranged in parallel along the length direction of the second heating elements.

[0012] In a third improvement to the present invention, the number of the first heating elements is two or more, the negative electrodes of the multiple first heating elements are electrically connected to the negative electrode of the power supply control unit, the positive electrode of each first heating element is electrically connected to a different positive electrode of the power supply control unit, and the parameters of each first heating element are the same or different.

[0013] Furthermore, the first heating element is made of an iron-chromium-aluminum alloy, comprising the following components by mass percentage: Cr 22.0–26.0%, Al 4.5–5.5%, Nb 0.3–0.6%, C ≤ 0.02%, N ≤ 0.02%, with the balance being Fe.

[0014] Furthermore, the second heating element is made of titanium-reinforced austenitic stainless steel, comprising the following components by mass percentage: Ti 0.8%~2%, Cr 16.0%~18.0%, Ni 10%~13%, Mo 2%~2.5%, C≤0.015%, N≤0.015%, Si≤0.3%, P≤0.03%, Mn≤1.0%, with the balance being Fe.

[0015] Furthermore, the method for preparing the second heating element is as follows: S1: After vacuum melting of austenitic stainless steel masterbatch, the molten metal flow is broken by high-pressure inert gas and rapidly solidified to obtain spherical pre-alloyed powder. S2: Atomized spherical pure titanium powder to achieve pure titanium spherical powder; S3: Place the spherical pre-alloyed powder and pure titanium spherical powder into the ball mill jar according to the mass ratio to complete the uniform mixing of the two; S4: Sieve to remove agglomerated particles with a particle size exceeding the set value, and then vacuum dry to obtain the modified stainless steel raw material; S5: The modified stainless steel raw material is processed and shaped to obtain the target part.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The two TCR heating elements used in this invention have significantly different TCR parameters, resulting in high accuracy and fast response in preventing dry burning. The dual-material composite structure with high and low TCR forms a unique temperature-resistance response characteristic, with a clear dry burning detection threshold and high signal recognition. It can achieve millisecond-level dry burning detection and power-off protection, completely solving the problems of dry burning damage and safety hazards of traditional atomizing cores. There is no need to add an additional temperature control sensor, reducing product production costs. 2. By connecting the first heating element and the second heating element to the power supply control unit respectively, the present invention can realize the independent control of the two, thereby making the heating temperature of the e-liquid controllable and achieving the best taste. 3. By placing the first heating element and the second heating element on the same horizontal plane in part or all of the present invention, the electronic e-liquid can be detected more accurately. When there is no electronic e-liquid, the heating of the first heating element can be cut off in time, taking into account both the taste and the need to prevent dry burning. 4. This invention improves the materials of the first and second heating elements, resulting in a high degree of matching in their thermal expansion properties, thus significantly improving the fatigue life of laser welding. The two materials have similar linear thermal expansion rates, which significantly reduces thermal stress concentration in the weld joint during repeated heating-cooling cycles, thereby greatly improving the fatigue life and reliability of laser welding. 5. Through material improvement and optimization, this invention greatly enhances the temperature sensing sensitivity, achieves a dual improvement in anti-dry burning function and welding reliability, and improves the overall performance of the atomizing core. Attached Figure Description

[0017] To more clearly illustrate the solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the first heating element and the second heating element of the present invention in a first embodiment; Figure 2 This is a schematic diagram of the structure of the first heating element and the second heating element of the present invention in a second embodiment; Figure 3 This is a schematic diagram of the structure of the first heating element and the second heating element in the third embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first heating element and the second heating element in the fourth embodiment of the present invention. Detailed Implementation

[0019] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects, not to describe a particular order.

[0020] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figures 1-4As shown, the present invention relates to a composite anti-dry-burning atomizing device based on a multi-TCR material atomizing core, comprising an atomizing core body and a power supply control unit. The atomizing core body includes at least one first heating element 1 and at least one second heating element 2, wherein the first heating element 1 and the second heating element 2 have different resistance temperature coefficients (TCR) values. The positive electrode of the first heating element 1 is electrically connected to the first positive electrode 5 of the power supply control unit, and the positive electrode of the second heating element 2 is electrically connected to the second positive electrode 7 of the power supply control unit. The negative electrodes 3 of the first heating element 1 and 4 of the second heating element 2 are respectively electrically connected to the negative electrode 6 of the power supply control unit. Although they share the negative electrode 6, the negative electrodes 3 of the first heating element 1 and 4 of the second heating element 2 do not come into contact.

[0023] Preferably, the first heating element 1 and the second heating element 2 are at least partially disposed on the same horizontal plane and are arranged side by side with a gap. The power supply control unit can independently control the working state of the first heating element 1 and the second heating element 2. The TCR value of the first heating element 1 is in the range of 10-300 ppm / ℃, used to provide the main heating atomization power. The TCR value of the second heating element 2 is in the range of 900-3500 ppm / ℃, mainly configured to determine whether dry burning has occurred based on its current temperature and / or resistance value. Preferably, in this example, the absolute value of the difference between the first heating element 1 and the second heating element 2 is not less than 500 ppm / ℃, more preferably not less than 1000 ppm / ℃.

[0024] The power supply control unit provides electrical energy to the first heating element 1 and the second heating element 2 through positive and negative electrodes. The first heating element 1 and the second heating element 2 serve as heating elements (the resistance is affected by the material, length, cross-sectional area, and temperature). After being powered on, the first heating element 1 acts as the main heating device to generate heat and atomize the e-liquid, while the second heating element 2 can also provide auxiliary heating. The power supply control unit indirectly controls the voltage and current across the electrodes by adjusting the output power, thereby controlling the heating state of the first heating element 1 and the second heating element 2.

[0025] The resistance values ​​of the first heating element 1 and the second heating element 2 of this invention change with temperature. Therefore, in this invention, the flavor of the e-cigarette is adjusted by the first heating element 1, the current temperature of the heating grid is determined by detecting the resistance value of the heating material, the temperature change of the heating grid is adjusted by adjusting the voltage / current of the heating grid, and the current heating temperature is determined by the current resistance value until the most suitable heating temperature for the e-liquid is found.

[0026] In this example, the second heating element 2 is used to prevent dry burning. Specifically, when the heating mesh is empty of e-liquid, the electronic cigarette heating mesh will dry burn, the temperature will rise rapidly, and the resistance value will change. When the resistance value exceeds the threshold, the power supply to the first heating element 1 and the second heating element 2 can be quickly cut off to prevent them from continuing to heat up, thus achieving the purpose of preventing dry burning.

[0027] This invention employs two types of TCR heating elements with significantly different TCR parameters, resulting in high accuracy and fast response in preventing dry burning. The dual-material composite structure with high and low TCR forms a unique temperature-resistance response characteristic, providing a clear dry burning detection threshold and high signal recognition. It can achieve millisecond-level dry burning detection and power-off protection, completely solving problems such as dry burning damage and safety hazards of traditional atomizing cores. It eliminates the need for additional temperature control sensors, reducing product manufacturing costs.

[0028] By connecting the first heating element 1 and the second heating element 2 to the power supply control unit respectively, the present invention enables independent control of the two, thereby making the heating temperature of the e-liquid controllable and achieving the best taste. In addition, by placing the first heating element 1 and the second heating element 2 partially or entirely on the same horizontal plane, the present invention can more accurately detect the e-liquid. When there is no e-liquid, the heating of the first heating element 1 can be cut off in time, improving the accuracy of detection.

[0029] Preferably, in this example, the first heating element 1 adopts a mesh structure, and the area of ​​the first heating element 1 is much larger than the area of ​​the second heating element 2. The second heating element 2 can adopt a heating mesh, heating wire, or heating plate structure, as long as it can sensitively detect temperature changes. In this example, the ratio of the total area of ​​the first heating element 1 to the total area of ​​the second heating element 2 is 2-10:1, making the first heating element 1 the main heating element to drive the atomization of the e-liquid, ensuring stable heating, and achieving a more stable heating temperature to obtain the desired flavor.

[0030] like Figure 1 As shown, in the first embodiment of the present invention, the atomizing core body includes an atomizing core support. The first heating element 1 and the second heating element 2 are both planar mesh-like in shape. The first heating element 1 and the second heating element 2 can be arranged side by side with the inner wall of the atomizing core support. The second heating element 2 of the present invention is disposed on one side of the first heating element 1. The second heating element 2 and the first heating element 1 have the same width. Both can be rolled into a cylindrical shape along the length direction and embedded inside the atomizing core support. The lower surfaces of the first heating element 1 and the second heating element 2 are flush. When e-liquid is insufficient, the first heating element 1 and the second heating element 2 are in the same state, which can be detected in time and the detection is more accurate.

[0031] Of course, in this example, the second heating element 2 can also be a heating wire of a certain diameter, disposed on one side of the first heating element 1. Furthermore, the first heating element 1 and the second heating element 2 in this example do not necessarily need to be of the same width; they can be set to different widths, such that the second heating element 2 is positioned slightly above or slightly below the first heating element 1, which can also achieve sensitive detection.

[0032] like Figure 2 As shown, as a second embodiment of the present invention, this example changes the positional relationship between the first heating element 1 and the second heating element 2 based on the first embodiment. In this example, the second heating element 2 is a small heating plate or a small heating mesh. The first heating element 1 has a clearance at one of its four corners, and the second heating element 2 is located at the clearance of the first heating element 1 and is not in contact with the first heating element 1. Alternatively, the second heating element 2 can be configured to be surrounded by the first heating element 1, with a hollow portion provided on the first heating element 1, and the second heating element 2 is located in the hollow portion, without contacting the first heating element from all sides.

[0033] like Figure 3 As shown, in the third embodiment of the present invention, based on the first embodiment, the number of first heating elements 1 is set to three, arranged in parallel in layers along the axial direction of the atomizing core support. The number of second heating elements 2 is one, with the first heating elements 1 arranged side by side along the length direction of the second heating elements 2. The first heating elements 1 and the second heating elements 2 are enclosed in a cylindrical shape inside the atomizing core support. Multiple first heating elements 101, 102, and 103 are arranged in parallel, and each first heating element can have a different resistance value, thus forming any resistance value. Furthermore, by arranging the first heating elements 101-103 in parallel, the overall resistance value can be effectively reduced, and the heating power can be increased. In actual temperature adjustment, the temperature of the mesh can be adjusted by changing the positive voltage of the B heating end. Of course, the number of first heating elements in this example can be adjusted according to actual needs. like Figure 4 As shown, in the fourth embodiment of the present invention, based on the first embodiment, the number of first heating elements is set to two. The negative electrodes of the two first heating elements 104 and 105 are electrically connected to the negative electrode of the power supply control unit, respectively. The positive electrodes of each first heating element 104 and 105 are electrically connected to different positive electrodes of the power supply control unit. The parameters of the first heating elements 1 may be the same or different, including material, resistance, and / or TCR coefficient. In actual control, the heating temperature is controlled by adjusting the specific number and resistance of the first heating elements connected.

[0034] As a fifth embodiment of the present invention, the number of second heating elements 2 in this example can also be multiple, evenly distributed near the first heating element, and multiple second heating elements can be used for joint detection to improve detection accuracy.

[0035] The anti-dry-burning control process of the atomizing core composite anti-dry-burning atomizing device based on multi-TCR material of this invention is as follows: When the suction action occurs, the microphone responds under negative pressure, the second heating element is powered on, and it is determined whether the first heating element is dry-burning. If so, the heating of both the first and second heating elements is canceled, and an alert is issued; if not, the second heating element is disconnected, the first heating element is turned on, and atomization is performed solely by the first heating element until the suction is completed.

[0036] Of course, in this example, after the suction action occurs and the microphone responds under negative pressure, the second heating element is powered on to determine whether the first heating element is dry-burning. If not, the first and second heating elements can be turned on simultaneously to heat and atomize together until the current cycle ends.

[0037] The TCR value range of the second heating element 2 of the present invention is much larger than that of the first heating element 1, thereby making the second heating element 2 of the present invention extremely sensitive to temperature and able to determine whether dry burning has occurred within 10ms, with a very fast response.

[0038] As can be seen from the above, the present invention has the following significant beneficial effects: 1. This invention adopts a multi-TCR differential alloy composite structure, which separates and implements the anti-dry burning detection function and the atomization taste optimization function independently and works in concert. It breaks through the performance bottleneck of traditional single atomization materials. The high TCR alloy realizes ultra-high precision temperature detection and rapid dry burning identification, while the conventional TCR alloy ensures stable and efficient atomization, perfectly balancing equipment safety and vaping experience.

[0039] 2. The high TCR alloy detection element of this invention is extremely sensitive to temperature changes and can identify slight liquid shortage and local dry burning conditions that cannot be detected by traditional structures. The response delay is less than 10ms, which can block the dry burning carbonization process in advance, completely eliminate the generation of burnt smell, effectively protect the atomizing core structure, and greatly extend the service life of the equipment.

[0040] 3. The special alloy heating element of this invention provides uniform heating and high heat conversion rate, which can quickly reach the optimal atomization temperature. The atomized liquid is fully atomized, the aerosol is delicate and full, the suction resistance is moderate, and the taste is rich. Compared with traditional atomizing cores, the taste layering and explosive power are significantly improved, and the flavor reproduction is higher.

[0041] 4. The multi-alloy composite integrated structure of this invention has a compact design, requires no additional sensors, is easy to assemble, has controllable cost, strong compatibility, and can be adapted to various specifications of electronic atomization devices. It has excellent mass production and market adaptability.

[0042] In the processing of the atomizing core, the negative electrodes of the first heating element and the second heating element need to be welded to the negative electrode simultaneously. To achieve non-contact between the two, the negative electrodes of the sheet-like first heating element and the second heating element are generally welded to the two sides of the negative electrode respectively. However, since the thermal expansion coefficients of stainless steel and iron-chromium-aluminum are often mismatched, the atomizing core repeatedly undergoes thermal cycles of heating and atomization and cooling during operation. The interface between dissimilar metals will continuously generate thermal expansion and contraction stress. Micro-cracks, weld failure, and fatigue fracture are prone to occur at the laser welding seam, resulting in a significant reduction in the overall fatigue life of the atomizing core, poor stability of batch products, and a high scrap rate.

[0043] Therefore, the present invention optimizes the materials of the first heating element 1 and the second heating element 1, so that the first heating element 1 and the second heating element 1 of the present invention can meet the dual core requirements of similar thermal expansion coefficients and significant TCR difference, thus solving the industry pain points of low welding fatigue life and weak anti-dry burning ability.

[0044] Specifically, this invention modifies 316L stainless steel with titanium and adjusts or modifies iron-chromium-aluminum to make their thermal linear expansion rates similar while maintaining a significant difference in thermal coefficient of thermal expansion (TCR). This reduces thermal stress at the laser-welded joint, improving the fatigue life of the laser-welded atomized core; and utilizes the TCR difference to achieve anti-dry-burning detection.

[0045] In a preferred embodiment of the present invention, the first heating element 1 is made of a modified iron-chromium-aluminum alloy, comprising the following components by mass percentage: Cr 22.0–26.0%, Al 4.5–5.5%, Nb 0.3–0.6%, C ≤ 0.02%, N ≤ 0.02%, with the balance being Fe. The coefficient of thermal expansion (CTE) of the modified iron-chromium-aluminum alloy is approximately 16.3–16.5 × 10⁻⁻⁻⁶. 6 / °C (0~200°C).

[0046] The preparation method of the modified iron-chromium-aluminum alloy is as follows: The alloy raw materials are precisely weighed according to the formula, and modified iron-chromium-aluminum ingots are prepared using a vacuum melting process. These ingots are then forged and rolled into thin strips. The strips undergo high-temperature stabilization heat treatment at 1100–1200℃ for 1.5–2.5 hours, followed by air cooling to refine the alloy microstructure, stabilize thermal expansion parameters, and reduce the thermal chromium content (TCR), thus completing the preparation of the modified iron-chromium-aluminum. The modified iron-chromium-aluminum strips are then cold-rolled or stamped into the shape of the target part to obtain the desired component.

[0047] The second heating element 2 is made of titanium-reinforced austenitic stainless steel. In this example, the austenitic stainless steel substrate is 316L stainless steel, and the composition of the 316L stainless steel substrate by mass percentage is as follows: Cr 16.0-18.0%, Ni 10-13%, Mo 2-2.5%, C≤0.015%, N≤0.015%, Si≤0.3%, P≤0.03%, Mn≤1.0%, with the balance being Fe. At this point, the TCR value of the 316L stainless steel substrate is approximately 750-950 ppm / °C, and the coefficient of thermal expansion (CTE) is 16.0 × 10⁻⁻⁻⁶. 6 / °C (0~200°C).

[0048] In this invention, the optimal doping mass percentage of titanium is 0.8%~2%. This ratio range allows for optimal synergistic control of the TCR value and the coefficient of thermal expansion without compromising the corrosion resistance and mechanical properties of the 316L stainless steel matrix. Furthermore, the modified TCR value increases to 1250-1650, and the coefficient of thermal expansion (CTE) is approximately 16.3~17×10⁻⁻⁻⁶. 6 / °C (0~200°C).

[0049] As an embodiment of the present invention, the preparation method of the second heating element 1 in this example is as follows: S1: After vacuum melting of austenitic stainless steel masterbatch, the molten metal flow is broken by high-pressure inert gas and rapidly solidified to obtain spherical pre-alloyed powder. S2: Atomized spherical pure titanium powder to achieve pure titanium spherical powder; S3: Place the spherical pre-alloyed powder and pure titanium spherical powder into the ball mill jar according to the mass ratio to complete the uniform mixing of the two; S4: Sieve to remove agglomerated particles with a particle size exceeding the set value, and then vacuum dry to obtain the modified stainless steel raw material; S5: The modified stainless steel raw material is processed and shaped to obtain the target part.

[0050] In step S1, after the 316L stainless steel masterbatch in this embodiment is vacuum melted, the molten metal flow is broken by high-pressure argon gas (or other inert gas) and rapidly solidified to obtain spherical pre-alloyed powder with a particle size of 15–45 μm.

[0051] In step S2, the pure titanium is directly selected from EIGA (cruiseless induction) gas atomization of commercial pure titanium CP-Ti (TA1 / Grade1) spherical powder with a particle size of 15–45 μm.

[0052] In step S3, in this embodiment, spherical pre-alloyed powder of 316 stainless steel and spherical powder of pure titanium are placed in an argon-protected ball mill jar according to a certain mass ratio, and ball milled at 60-80 rpm for 4-6 hours to complete the uniform mixing of powders; the mixed powder is then dried in a vacuum environment at 80°C for 4 hours and stored in an argon-protected glove box.

[0053] In step S4, a 45μm sieve is used in this example to remove large agglomerated particles with a particle size exceeding 45μm; vacuum drying at 80℃ for 4h yields the modified stainless steel raw material.

[0054] In step S5, the processing and forming method is as follows: (1) Weigh a certain amount of modified stainless steel raw materials, and then smelt and cast each raw material to obtain stainless steel ingots. (2) Heat the ingot to a certain holding temperature and perform homogenization annealing. The holding time is 30 h + (10~15 min / mm)×a, where a is the thickness of the ingot. Then, hot roll forming is performed to obtain a stainless steel plate with a certain shape. (3) Heat the stainless steel sheet to the second set temperature range and hold it for a set time to perform a solution treatment, and then cool it rapidly to room temperature. (4) The stainless steel sheet is processed into the shape of the target part by cold rolling or stamping to obtain the target part.

[0055] In step (2), the holding temperature in this example is 1180 ℃~1250 ℃. The hot rolling forming adopts a gradient temperature, and multiple rolling passes are performed in the range of 1050-1180℃ to form a uniform fine-grained structure in the stainless steel sheet. In step (3), the second set temperature is 1080 ℃~1150 ℃, and the holding time for solution treatment is 60~300 min. In this example, rapid water quenching to room temperature is used.

[0056] The two metal alloy composite forming methods in this invention are as follows: The negative electrode of the modified stainless steel base part and the modified iron-chromium-aluminum part is compositely packaged with the negative electrode using nanosecond laser welding technology. The welding power is 80-120W, the welding speed is 300-500mm / s, and the spot diameter is 0.15-0.25mm, achieving a precision welding composite without pores or cracks.

[0057] This invention improves the materials of the first heating element 1 and the second heating element 2, resulting in a high degree of matching of their thermal expansion properties, thus significantly improving the fatigue life of laser welding. The two materials have similar linear thermal expansion rates, which significantly reduces thermal stress concentration in the weld joint during repeated heating-cooling cycles, thereby greatly improving the fatigue life and reliability of laser welding. This invention significantly improves temperature sensitivity through material improvement and optimization, achieving a dual improvement in anti-dry burning function and welding reliability, thereby enhancing the overall performance of the atomizing core.

[0058] The present invention will be described in detail below through specific embodiments.

[0059] Example 1: The first heating element is a modified iron-chromium-aluminum alloy, comprising the following components by mass percentage: Cr 26%, Al 5.5%, Nb 0.4%, C 0.02%, N 0.02%, with the remainder being Fe. It is then processed according to the method of this invention. Figure 1 A heating mesh in a specific shape.

[0060] The second heating element uses a 0.8 wt% titanium-reinforced 316L austenitic stainless steel matrix and is processed using the preparation method of the second heating element of this invention. Figure 1 A heating mesh in a specific shape.

[0061] The preparation methods of Examples 2-6 and Comparative Examples 1-4 are the same as those of Example 1, except that the components are different. The contents of each component (except Fe) in Examples 2-6 and Comparative Examples 1-4 are shown in Table 1.

[0062] Table 1. Content of each component (except Fe) in Examples 1-6 and Comparative Examples 1-4 Material performance testing: This invention mainly involves the following material performance tests: 1. The temperature coefficient of resistance (TCR) is tested in accordance with the national standard "Test Method for Temperature Coefficient of Resistance of Precision Resistance Alloys"; 2. The coefficient of thermal expansion (CTE) shall be tested in accordance with the relevant test specifications for the coefficient of thermal expansion of stainless steel, using a vertical quartz dilatometer or an optical dilatometer. 3. The resistivity (ρ) test is performed using the Kelvin bridge method (four-terminal method), which involves applying current from both ends of the sample through two current terminals and measuring the voltage between two voltage terminals spaced a certain distance apart in the middle of the sample to test the resistivity. 4. Resistance (R) testing is performed using a DC low resistance tester (milliohm meter). 5. The thermal fatigue life test of the welded joint adopts the hot and cold alternating cycle test. The specific test procedure is as follows: (1) Fix the welding specimen to the tooling of the thermal fatigue testing machine to ensure uniform stress and no additional assembly stress; (2) Set the parameters for the alternating hot and cold cycle: high temperature peak 600℃, hold for 5 min; low temperature room temperature 25℃, hold for 5 min, total duration of one cycle 10 min, heating and cooling rates are uniformly 8℃ / min; (3) Continuous cyclic loading, and the weld and heat-affected zone are observed with a metallographic microscope every 50 cycles to record the microcrack initiation. (4) Failure judgment criteria: When the welded joint has macroscopic cracks with a length ≥0.1mm, weld cracking or interface debonding, it is considered fatigue failure of the sample, and the final number of cycles is recorded.

[0063] The test results of the material properties are shown in Table 2. TCR1, CTE1, ρ1, and R1 are the temperature coefficient of resistance, coefficient of thermal expansion, resistivity, and resistance of the second heating element, respectively. TCR2, CTE2, ρ2, and R2 are the temperature coefficient of resistance, coefficient of thermal expansion, resistivity, and resistance of the first heating element, respectively.

[0064] Table 2 Material performance test results Finished product performance testing: This invention assembles two heating meshes with oil-guiding cotton to form an integrated atomizing component. The integrated atomizing component is then installed into the atomizing core bracket, and the positive and negative electrodes of each component are welded to the positive and negative electrodes of the power supply control unit, respectively, to achieve the assembly of the atomizing component. Finally, the atomizing core body is assembled into the electronic cigarette to form the finished electronic cigarette.

[0065] The present invention mainly conducts performance tests on the finished product from the following aspects, and the test results are shown in Table 3: 1. High-temperature static test: After the atomizer using this atomizer core is placed at 60℃ and 90%RH for 7 days, observe whether the e-liquid will corrode the atomizer core. 2. Room temperature resting: After the atomizer using this atomizer core is left to stand at 25℃ and 50%RH for 7 days, observe whether the e-liquid will corrode the atomizer core; 3. Suction test: Using a large-capacity open device, circulate e-liquid and sip until the limit is reached, observe whether the atomizer core is broken and evaluate the taste; 4. Anti-dry burning function test: Use an empty e-cigarette (without filling) to perform inhalation and continue inhaling after the e-liquid has been emptied, and observe whether the device stops outputting.

[0066] Table 3. Results of Finished Product Performance Tests By comparing Comparative Example 1 and Examples 1-6 of the present invention, the TCR1 value of the present invention is significantly improved compared to conventional 316L stainless steel, effectively enhancing the sensitivity of the second TCR heating element. The thermal fatigue cycle life test is also significantly increased compared to 3200 cycles, indicating that the present invention, through material improvement and optimization, greatly improves the temperature sensing sensitivity, achieves high anti-dry-burning accuracy and fast response, realizing a dual improvement in anti-dry-burning function and welding reliability, and enhancing the overall performance of the atomizing core. Comparative Example 2 shows that the titanium content in the second heating element is too low, and the TCR value is basically the same as the original 316L stainless steel matrix. The thermal fatigue cycle life test is 3800 cycles, far less than that of Examples 1-6, and the heating element fractures during high-temperature static placement, indicating that the overall performance improvement, such as corrosion resistance, is not significant.

[0067] As can be seen from Examples 1-6 and Comparative Example 3 of the present invention, an appropriate amount of titanium can achieve optimal coordination and control of the TCR value and the coefficient of thermal expansion. However, excessive titanium will cause inclusions and long-term resistance aging risks, leading to deterioration of processing performance.

[0068] As demonstrated in Examples 4-5 of this invention, with the increase of Al content in the first heating element, the resistivity increases and the TCR decreases. Similarly, with an appropriate increase of Cr content, the resistivity increases and the TCR decreases, while the coefficient of thermal expansion remains unchanged, which is beneficial for enhancing the flavor profile. As demonstrated in Example 6 and Comparative Example 4, the addition of Nb content refines the grain size, improves the adhesion of the oxide film, and simultaneously reduces the TCR value through grain boundary scattering, thereby increasing the resistivity and improving the precision of flavor control.

[0069] The specific embodiments described above are preferred embodiments of the present invention and are not intended to limit the specific scope of the present invention. The scope of the present invention includes, but is not limited to, these specific embodiments. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A composite anti-dry-burning atomizing device based on a multi-TCR material atomizing core, characterized in that: Including the atomizer core and power supply control unit; The atomizing core body includes at least one first heating element and at least one second heating element; The first heating element and the second heating element have different resistance temperature coefficients (TCR). The first heating element and the second heating element are each independently connected to the power supply control unit; The power supply control unit is configured to independently control the working status of the first heating element and the second heating element; The second heating element is configured to determine whether dry burning has occurred based on its current temperature and / or resistance.

2. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 1, characterized in that: The first heating element and the second heating element are at least partially disposed on the same horizontal plane and are arranged side by side with a gap between them.

3. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 1, characterized in that: The first heating element has a TCR value range of 10-300 ppm / ℃ and is used to provide the main heating atomization power. The second heating element has a TCR value range of 900-3500 ppm / ℃ and is mainly used for temperature sensing and preventing dry burning.

4. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 1, characterized in that: The ratio of the total area of ​​the first heating element to the total area of ​​the second heating element is 2-10:

1.

5. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 2, characterized in that: Both the first heating element and the second heating element are planar mesh-like in shape; The second heating element is located to the left, right, upper left, lower left, upper right, or lower right of the first heating element, or the second heating element is surrounded by the first heating element; The first heating element and the second heating element can be fitted to the inner wall of the atomizing core support, and the first heating element and the second heating element are arranged to form a columnar structure within the atomizing core support.

6. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 2, characterized in that: The number of the first heating elements is two or more, and they are arranged in parallel at intervals along the axial direction of the atomizing core support. The number of the second heating elements is one, and the first heating elements are arranged in parallel along the length direction of the second heating elements.

7. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 2, characterized in that: The number of first heating elements is two or more. The negative electrodes of the multiple first heating elements are electrically connected to the negative electrode of the power supply control unit, and the positive electrode of each first heating element is electrically connected to a different positive electrode of the power supply control unit. The parameters of each first heating element may be the same or different.

8. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to any one of claims 1-7, characterized in that: The first heating element is made of iron-chromium-aluminum alloy, comprising the following components by mass percentage: Cr 22.0-26.0%, Al 4.5-5.5%, Nb 0.3-0.6%, C≤0.02%, N≤0.02%, with the balance being Fe.

9. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to any one of claims 1-7, characterized in that: The second heating element is made of titanium-reinforced austenitic stainless steel, comprising the following components by mass percentage: Ti 0.8%~2%, Cr 16.0%~18.0%, Ni 10%~13%, Mo 2%~2.5%, C≤0.015%, N≤0.015%, Si≤0.3%, P≤0.03%, Mn≤1.0%, with the balance being Fe.

10. The atomizing core composite anti-dry-burning atomizing device based on multi-TCR material according to claim 9, characterized in that: The preparation method of the second heating element is as follows: S1: After vacuum melting of austenitic stainless steel masterbatch, the molten metal flow is broken by high-pressure inert gas and rapidly solidified to obtain spherical pre-alloyed powder. S2: Atomized spherical pure titanium powder to achieve pure titanium spherical powder; S3: Place the spherical pre-alloyed powder and pure titanium spherical powder into the ball mill jar according to the mass ratio to complete the uniform mixing of the two; S4: Sieve to remove agglomerated particles with a particle size exceeding the set value, and then vacuum dry to obtain the modified stainless steel raw material; S5: The modified stainless steel raw material is processed and shaped to obtain the target part.

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