Heating needle, heating device, and aerosol-generating device

Abstract

The heating needle, the heating device and the aerosol generating device provided by the embodiments of the present application comprise a supporting section and a heating section. The heating section is adapted to be in contact with the heating medium area and is made of a first material and is adapted to generate heat under an alternating magnetic field to heat the heating medium area. The supporting section is connected with the heating section and is adapted to be in contact with the non-heating medium area. The supporting section is made of a second material. The second material is a material that does not respond to electromagnetic induction, and the heat conduction capacity of the second material is lower than that of the first material, thereby limiting the diffusion of heat from the physical structure, avoiding passive temperature rise of the non-heating area, and reducing the generation of burnt taste.

Description

Technical Field

[0001] This invention relates to the field of atomization technology, and in particular to a heating needle, a heating device, and an aerosol generating device. Background Technology

[0002] Currently, heated non-combustible aerosol generators are widely used. The working principle of a heated non-combustible aerosol generator is to control the heating element to heat the aerosol generating matrix, ensuring that the aerosol is released without direct combustion. Its core principle is "heating without combustion," which reduces the generation of harmful substances. Heated non-combustible aerosol generators typically heat the aerosol generating matrix using a heating needle. However, this heating needle can easily cause undesirable temperature rises in other areas, leading to defects such as a burnt smell, thus leaving room for improvement. Summary of the Invention

[0003] Embodiments of the present invention provide a heating needle, a heating device, and an aerosol generating device, which aim to improve the problem that the aforementioned heating needle can easily cause undesirable areas to also generate temperature rise, thereby resulting in a burnt smell and increased energy consumption.

[0004] In a first aspect, the present invention provides a heating needle for heating an aerosol generation matrix, the heating needle comprising:

[0005] A heating section is adapted to dock with the heating medium region of the aerosol generating matrix, the heating section being made of a first material and adapted to generate heat under an alternating magnetic field to heat the heating medium region;

[0006] A support section, connected to the heating section and adapted to dock with the non-heated medium region of the aerosol generating matrix, the support section being made of a second material;

[0007] The second material is a material that does not respond to electromagnetic induction, and the thermal conductivity of the second material is lower than that of the first material.

[0008] In some embodiments, the relative permeability of the first material is >200.

[0009] In some embodiments, the thermal conductivity of the second material is ≤7 W / (m·K).

[0010] In some embodiments, the first material includes at least one of silicon steel, carbon steel, and nickel-chromium alloy;

[0011] The second material includes at least one of PI, zirconium oxide, and titanium alloy.

[0012] In some embodiments, the junction between the heating section and the support section is fixedly connected.

[0013] In some embodiments, the junction of the heating section and the support section is welded and fixed, and the welding method includes: brazing, laser welding, tungsten inert gas welding, and resistance welding.

[0014] In some embodiments, the junction of the heating section and the support section, after welding, satisfies at least one of the following:

[0015] The vertical pull-out force at the weld joint is greater than 30N;

[0016] The airtightness of the weld joint must be at least level 7.

[0017] In some embodiments, the heating section is constructed as a hollow tubular structure.

[0018] In some embodiments, the support section is constructed as a hollow tubular structure communicating with the heating section.

[0019] In some embodiments, the heating needle further includes a reinforcing rod, which is built into the heating section and the support section, and the heating section and the support section are connected by the reinforcing rod.

[0020] In some embodiments, the reinforcing rod is a metal rod; the heating section is welded to the reinforcing rod, and the supporting section is riveted to the reinforcing rod.

[0021] In some embodiments, the heating needle further includes a tip disposed at the end of the heating section away from the support section.

[0022] In some embodiments, the tip is made of a material that does not respond to electromagnetic induction.

[0023] In some embodiments, the heating needle further includes a temperature sensor disposed on the inner wall of the heating section; the lead of the temperature sensor is led out from the hollow hole of the support section and the heating section.

[0024] In some embodiments, the heating needle further includes a temperature sensor disposed at the connection point between the heating section and the support section.

[0025] In some embodiments, the heating needle further includes a tip and a temperature sensor, the end of the heating section away from the support section is formed as a closed end, the tip is fixed to the outside of the closed end, and the temperature sensor is connected to the inside of the closed end.

[0026] This application also discloses a heating device, comprising:

[0027] The heating needle described in any of the preceding claims; and

[0028] An electromagnetic coil is disposed on the outer periphery of the heating section to generate an alternating magnetic field.

[0029] In some embodiments, the electromagnetic coil is constructed in a spiral shape with a non-uniform pitch.

[0030] In some embodiments, the wire diameter of the electromagnetic coil is D, and the pitch varies from 0D to 3D.

[0031] In some embodiments, a base is also included, with one end of the support section away from the heating section fixed to the base.

[0032] In some embodiments, a bracket is also included for mounting the electromagnetic coil, and the bracket is connected to the base.

[0033] In some embodiments, the bracket and the base are provided with interlocking structures that cooperate with each other.

[0034] In some embodiments, the electromagnetic coil is embedded within the bracket.

[0035] In some embodiments, the electromagnetic coil is an LDS coil formed on the inner wall of the support.

[0036] This application also discloses an aerosol generating apparatus, comprising:

[0037] The heating device described in any of the preceding claims;

[0038] Batteries; and

[0039] A control circuit board is connected between the battery and the heating device.

[0040] In some embodiments, the control circuit board is provided with a boost circuit connected between the battery and the electromagnetic coil to increase the power supply voltage of the electromagnetic coil.

[0041] In the heating needle, heating device, and aerosol generating device provided in the embodiments of the present invention, the heating needle includes a support section. The heating section is adapted to dock with the heating medium region and is made of a first material and adapted to generate heat under an alternating magnetic field to heat the heating medium region. The support section is connected to the heating section and adapted to dock with the non-heating medium region. The support section is made of a second material. The second material is a material that does not respond to electromagnetic induction, and the thermal conductivity of the second material is lower than that of the first material. By separating the functions of the heating section and the support section, and utilizing the characteristics of the second material that does not respond to electromagnetic induction and has low thermal conductivity, the heating needle restricts heat diffusion from a physical structure perspective. Only the heating section actively generates heat under an alternating magnetic field. The support section, due to its lack of electromagnetic response, does not generate additional heat, thus avoiding passive heating of the non-heating region. At the same time, it blocks heat conduction. The low thermal conductivity of the support section forms thermal resistance, effectively suppressing the transfer of heat from the heating section to the non-heating medium region and reducing the risk of local overheating. The heating section and the support section dock with the heating medium region and the non-heating medium region respectively, forming thermal isolation through the difference in material thermal conductivity, thereby reducing the generation of burnt odor. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the aerosol generating device provided in an embodiment of the present invention.

[0043] Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the heating device and the aerosol generation matrix in the aerosol generation apparatus.

[0044] Figure 3 This is a cross-sectional schematic diagram of a heating device according to an embodiment of the present invention.

[0045] Figure 4 This is a schematic cross-sectional view of the aerosol generation matrix in an exemplary embodiment of the present invention.

[0046] Figure 5 This is a schematic diagram of the heating needle in an exemplary embodiment of the present invention.

[0047] Figure 6 This is a schematic diagram of the structure of the electromagnetic coil and heating needle in an exemplary embodiment of the present invention.

[0048] Figure 7 This is a cross-sectional schematic diagram of the heating needle in one embodiment of the present invention.

[0049] Figure 8 This is a cross-sectional schematic diagram of the heating needle in another embodiment of the present invention.

[0050] Figure 9 This is a cross-sectional schematic diagram of the heating needle in another embodiment of the present invention.

[0051] Figure 10 This is a cross-sectional schematic diagram of the heating needle in another embodiment of the present invention.

[0052] Figure label:

[0053] 10. Casing; 20. Battery; 30. Control circuit board; 40. Heating device

[0054] 100. Aerosol generating device

[0055] 200. Aerosol generation matrix; 210. Heating medium zone; 220. Non-heating medium zone.

[0056] 410. Heating needle; 420. Electromagnetic coil; 430. Base; 440. Support

[0057] 4101 Heating section; 4102 Support section; 4103 Tip; 4104 Temperature sensor; 4301 Engagement structure Detailed Implementation

[0058] To facilitate understanding, the terminology used in the embodiments of the present invention will be explained first.

[0059] And / or: This is simply a way of describing the relationship between related objects. It indicates that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0060] Multiple: refers to two or more.

[0061] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0062] The specific embodiments of the present invention will now be clearly described with reference to the accompanying drawings.

[0063] The embodiments of the present invention provide a heating needle, a heating device, and an aerosol generating device, which aim to improve the defects such as the heating needle causing undesirable temperature rises in unintended areas, resulting in burnt smells.

[0064] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the aerosol generating device 100 provided in an embodiment of the present invention.

[0065] The aerosol generating device 100 may include a housing 10, a battery 20, a control circuit board 30, and a heating device 40. The housing 10 serves as the main structure, and its interior may include a battery compartment and a circuit board mounting position to accommodate and install the battery 20 and the control circuit board 30. Simultaneously, the housing 10 may also form a mounting position for the heating device 40. The battery 20 is fixed within the compartment inside the housing 10 and can be connected to the control circuit board 30 via metal contacts. In specific implementations, the battery may be a lithium-ion battery to meet the instantaneous high current output requirements during heating; other types of batteries, such as sodium-ion batteries, may also be used, but this invention is not limited to any particular type. In specific implementations, the control circuit board 30 may integrate an MCU, a MOSFET, and protection circuits, with its input terminal connected to the battery 20 and its output terminal connected to the heating device 40, forming a control loop with the heating device 40.

[0066] In some embodiments, the control circuit board includes a boost circuit connected between the battery and the electromagnetic coil to increase the supply voltage of the electromagnetic coil. For example, the boost circuit of the control circuit board 30 can boost the battery voltage (e.g., 3.7V) to the operating voltage required by the heating device 40 (e.g., 5-12V), thereby increasing the power density of the heating element of the heating device 40 and enabling rapid heating of the aerosol generation matrix, for example, reaching the required temperature in 2-3 seconds. It is understood that the operating parameters described here are merely illustrative and do not constitute a limitation.

[0067] Simultaneously participate Figures 2 to 10 As shown, the heating device 40 may include a heating needle 410 and an electromagnetic coil 420. The heating needle 410 is used to heat the aerosol generation matrix 200.

[0068] The aerosol generating matrix 200 includes a heating medium zone 210 and a non-heating medium zone 220. This aerosol generating matrix 200 is precisely temperature-controlled (typically 180-350℃) by an electric heating element, releasing flavor substances without open flame combustion. Its core principle is to avoid the harmful substances produced by high-temperature combustion (500-900℃). The heating medium zone 210 can be the aerosol generating section, and the non-heating medium zone 220 can be the filter section.

[0069] Accordingly, the heating needle 410 may include a heating section 4101 and a support section 4102. The heating section 4101 is adapted to dock with the heating medium region 210, and the support section 4102 is connected to the heating section 4101 and adapted to dock with the non-heating medium region 220.

[0070] The electromagnetic coil 420 is disposed on the outer periphery of the heating section 4101 to generate an alternating magnetic field. The control circuit board 30 converts the DC power output from the battery 20 into high-frequency AC power, typically in the range of 20-1000kHz, via a boost circuit, driving the electromagnetic coil 420 to generate the alternating magnetic field. The heating section 4101 of the heating needle 410 is typically made of a ferromagnetic alloy. In the alternating magnetic field, eddy currents are generated due to electromagnetic induction, and its resistance characteristics directly convert electrical energy into heat energy, achieving targeted heating. The heating section 4101 is directly inserted into the heating medium zone 210 of the aerosol generation matrix 200, and heat is conducted to the heating medium through the contact interface, causing the material to release aerosols, such as flavor substances, in the range of 180-350℃. The support section 4102 is made of materials such as ceramic or high-temperature resistant plastic, which can prevent heat transfer to the non-heating medium zone 220 (filter section) to ensure that the filter temperature is below the set safe temperature.

[0071] In some embodiments, the heating device 40 further includes a base 430, with one end of the support segment 4102 away from the heating segment 4101 fixed to the base 430. The base 430 provides structural stability and precise positioning, such as axial support reinforcement. The base 430 provides a rigid fixing platform for the support segment 4102, reducing the risk of displacement of the heating needle 410 during insertion or removal from the aerosol generating matrix 200, ensuring stable contact between the heating segment 4101 and the heating medium area 210 of the aerosol generating matrix 200, and reducing localized overheating or uneven heating problems caused by misalignment. Furthermore, modular assembly is possible; the base 430 integrates the mounting interface for the heating needle 410, facilitating rapid assembly on the production line and compatibility with the replacement needs of heating needles 410 of different sizes. Additionally, the base 430 is typically made of a material with low thermal conductivity, such as ceramic, which can prevent heat transfer from the heating segment 4101 to the interior of the device, avoiding energy waste. The sealed connection between the base 430 and the support section 4102 can prevent the residue of the aerosol generation matrix 200 from entering the interior of the heating device 40, reducing the risk of short circuits caused by foreign object intrusion.

[0072] In some embodiments, the heating device 40 further includes a bracket 440 for mounting the electromagnetic coil, and the bracket 440 is connected to the base 430. The bracket 440, connected to the base, positions and secures the aerosol generating matrix 200, ensuring stable contact between the heating section 4101 and the heating medium area 210 of the aerosol generating matrix 200. In specific implementations, the bracket 440 and the base 430 can be detachably connected, allowing for individual replacement of the damaged electromagnetic coil 420. In some embodiments, the bracket 440 and the base 430 are provided with mutually engaging interlocking structures 4301. Through dovetail grooves or serrated interlocking, axial sliding is restricted, preventing the aerosol generating matrix 200 from causing the heating needle 410 to detach due to friction with the heating needle 410 during insertion and removal.

[0073] In some embodiments, the electromagnetic coil 420 is constructed as a helix with a non-uniform pitch distribution, i.e., it is constructed as a variable pitch coil. The variation pattern includes stepped, continuous gradient, or segmented combination. For example, in a specific implementation, the wire diameter of the electromagnetic coil 420 is D, and the pitch varies within the range of (0D-3D). By adjusting the coil spacing (0D-3D range), the magnetic field distribution can be changed, thereby precisely controlling the magnetic flux density modulus. A smaller spacing increases the magnetic field superposition effect, increasing the local magnetic flux density; a larger spacing reduces the magnetic field coupling strength, achieving a more uniform heating distribution. The spacing of the electromagnetic coils can effectively adjust the magnetic flux density modulus and control the heating effect.

[0074] In some embodiments, the electromagnetic coil 420 is embedded within the bracket 440. For example, to reduce the distance between the electromagnetic coil 420 and the heating needle 410 and increase the flux density modulus of electromagnetic induction, the coil can be nested inside the bracket 440 to form an LDS spiral coil. The LDS (Laser Direct Structuring) process can directly form a three-dimensional spiral coil on the inner wall of the bracket 440, reducing the radial gap between the coil and the heating section 4101 of the heating needle 410 to 0.1-0.3 mm, compared to >1 mm in traditional winding processes. This increases the flux density modulus by 30%-50%, significantly enhancing the eddy current effect and increasing the heating rate. Furthermore, the precise spiral wiring improves the uniformity of the alternating magnetic field distribution along the axial direction of the heating section 4101, further reducing the temperature difference in the heating medium region 210 and preventing localized carbonization. Additionally, the enhanced structural integration and reliability facilitate volume reduction and weight reduction. With the electromagnetic coil 420 embedded in the bracket 440, the overall thickness is reduced, making it suitable for miniaturized designs. The LDS coil and bracket 440 are integrally molded, which avoids the risk of coil loosening in traditional winding processes.

[0075] The heating needle 410 may include a heating section 4101 and a support section 4102. The heating section 4101 is adapted to dock with the heating medium region 210, and the support section 4102 is connected to the heating section 4101 and adapted to dock with the non-heating medium region 220. The heating section 4101 is made of a first material and is adapted to generate heat under an alternating magnetic field to heat the heating medium region 210. The support section 4102 is connected to the heating section and adapted to dock with the non-heating medium region, and the support section 4102 is made of a second material. The second material is a material that does not respond to electromagnetic induction, and the thermal conductivity of the second material is lower than that of the first material.

[0076] The segmented heating needle 410 design achieves multiple technical effects through differentiated material selection: the heating section uses a primary material with higher magnetic and thermal conductivity, which precisely generates eddy current heat under an alternating magnetic field, concentrating energy on the heating medium region 210 for rapid temperature rise. The support section 4102 uses a secondary material with low magnetic and thermal conductivity (such as titanium alloy or ceramic composite material with a thermal conductivity <7W / m·K), which not only blocks the interference of the magnetic field on the non-heated area, but also controls the temperature rise of the support section 4102 within a small range through the thermal resistance effect, preventing the filter tip from overheating and reducing heat conduction into the device, thus reducing power consumption.

[0077] In some embodiments, the relative permeability of the first material is >200. High relative permeability enhances the eddy current effect. High relative permeability (>200) significantly improves the material's response to alternating magnetic fields, reduces the proportion of hysteresis and eddy current losses, and increases heating efficiency. Under the same magnetic field strength, the magnetic flux density on the surface of the heating section 4101 can be correspondingly higher, thus increasing the response speed of the heating medium region 210. High permeability materials can absorb excess leakage magnetic flux, suppressing the leakage magnetic flux density in the non-heating region 220 to a low level, avoiding interference with internal sensors (such as NTC temperature control).

[0078] In some embodiments, the thermal conductivity of the second material is ≤7 W / (m·K). The low thermal conductivity (≤7 W / (m·K)) increases the thermal resistance of the support section 4102 to several times that of conventional metallic materials, significantly reducing the rate of heat transfer to the unheated area 220 and decreasing the temperature rise at the interface between the support section and the unheated area. The coefficient of thermal expansion (CTE) of the low thermal conductivity material is also typically low, ensuring stable contact pressure between the heating needle 410 and the aerosol generation matrix 200. Furthermore, the outer surface temperature of the support section 4102 can be maintained at a safe level.

[0079] Specifically, in some embodiments, the first material may include at least one of silicon steel, carbon steel, and nickel-chromium alloy. The second material may include at least one of PI, zirconium oxide, and titanium alloy. The heating section uses a high-permeability material (such as silicon steel or special alloy steel) to efficiently generate eddy current heat in an alternating magnetic field, concentrating energy on the heating medium region and significantly improving thermal efficiency. Meanwhile, the support section uses a low-thermal-conductivity, non-magnetic material (such as special composite materials) to block magnetic field interference and heat conduction paths, controlling the temperature rise of the non-heated area within a safe range, avoiding energy waste and the risk of component overheating.

[0080] The high magnetic permeability of the heating section 4101 material (such as the soft magnetic properties of silicon steel) can be adapted to high-frequency electromagnetic field conditions, reducing hysteresis loss; the support section 4102 material suppresses axial heat transfer through low thermal conductivity (such as amorphous magnetic materials or specific alloys), increases the temperature gradient, and reduces the temperature of the non-heating target area.

[0081] The non-electromagnetic response characteristics of the support section 4102 can avoid interference from the magnetic field to the non-heated area (such as sensor false triggering), while its low thermal conductivity, combined with the high thermal efficiency of the heating section 4101, can ensure rapid heating of the heating area and prevent overheating of external contact parts, thus meeting the dual requirements of equipment miniaturization and user safety.

[0082] In some embodiments, the junction of the heating section 4101 and the support section 4102 is welded and fixed. The welding method may include brazing, laser welding, tungsten inert gas welding (TIG welding), or resistance welding. This allows for the connection of dissimilar materials such as the heating section 4101 (e.g., silicon steel) and the support section 4102 (e.g., titanium alloy), ensuring strong interfacial bonding. Laser welding and TIG welding, through precise energy focusing, typically result in a heat-affected zone width ≤ 0.5 mm, avoiding material property degradation at the junction due to heat diffusion, such as decreased magnetic permeability of silicon steel or oxidation of titanium alloy. In some embodiments, after welding the junction of the heating section 4101 and the support section 4102, at least one of the following conditions must be met: the vertical pull-out force at the weld is greater than 30 N; the airtightness of the weld is at least level 7. This allows the weld to withstand the dynamic thermal stress of the heating section 4101 and the support section 4102. The airtightness of the weld is ≥ level 7 (leakage rate < 1 × 10⁻⁶). -7 The heating needle 410 is protected from external moisture and oil mist by using continuous, non-porous welds (porosity <0.1%) obtained through laser welding or inert gas protection (argon gas to prevent oxidation) during TIG welding. In specific implementations, the airtightness of the weld joint meets the following requirements:

[0083] Air pressure: 13.8 + / - 0.5 kPa

[0084] Aeration time: 4-8 seconds

[0085] Hold time: 5-10 seconds

[0086] Test time: 10s

[0087] Leakage value: <700pa

[0088] The airtightness leakage value meets the standard, and there are no scratches or deformations on the appearance.

[0089] In some embodiments, the heating section 4101 is constructed as a hollow tubular structure. Its wall thickness should be relatively small to reduce the volume of the heating zone, increase the heating power density, and ensure a faster heating effect; simultaneously, it must ensure that the needle-like structure does not deform, and the wall thickness in this area should be greater than 0.06 mm. The hollow tubular structure significantly reduces the volume of the heating zone by decreasing the wall thickness (>0.06 mm), concentrating heat in the tube wall area. Combined with the eddy current effect of the high-frequency electromagnetic field, this effectively increases the heating power density and achieves a faster local temperature rise rate.

[0090] With a minimum wall thickness of >0.06mm, the material's tensile strength is optimized to ensure that the heating section 4101 maintains the axial rigidity of its needle-like structure at high temperatures, preventing deformation caused by thermal stress or external loads. The hollow design also reduces overall weight and minimizes inertial interference with the dynamic heating process.

[0091] Thin-walled hollow structures have reduced heat capacity, allowing them to reach thermal equilibrium quickly and reducing internal stress concentration caused by temperature gradients. For example, in pulse heating mode, the tube wall is heated uniformly, avoiding localized overheating that could lead to material fatigue or cracking.

[0092] Hollow tubular structures can be achieved through precision drawing or laser cutting processes. The design with a wall thickness >0.06mm not only meets the requirements of high-precision processing, but also avoids processing defects caused by excessively thin walls, such as microcracks or uneven tube walls.

[0093] The hollow structure reduces thermal inertia, making it suitable for intermittent heating scenarios that require rapid start-up and shutdown.

[0094] In some embodiments, the support section 4102 is constructed as a hollow tubular structure communicating with the heating section 4101, which facilitates the placement of a temperature sensor 4104 inside.

[0095] In some embodiments, the heating needle 410 further comprises a reinforcing rod, which is built inside the heating section 4101 and the supporting section 4102, and the heating section 4101 and the supporting section 4102 are connected via the reinforcing rod. In some embodiments, the reinforcing rod is a metal rod. By providing the built-in reinforcing rod, and then connecting the heating section 4101 and the supporting section 4102 respectively through riveting and welding, the bending strength and stability are ensured. The built-in metal reinforcing rod adopts the dual connection mode of riveting and welding, which significantly enhances the bonding strength between the heating section 4101 and the supporting section 4102, forming a rigid support framework. The high elastic modulus of the metal rod can effectively resist external bending moment, and avoid plastic deformation of the needle body under high temperature or load. The composite process combining riveting and welding (such as laser welding or resistance welding) can realize rapid positioning and high-precision fixation of the metal rod and the heating section 4101, while avoiding interface weakening caused by a single connection mode.

[0096] In some embodiments, the heating needle 410 further comprises a tip 4103, which is disposed at an end of the heating section 4101 away from the supporting section 4102. The provision of the tip 4103 facilitates the penetration of the heating needle 410 into the aerosol-generating substrate 200. The tip 4103 can also close the end of the hollow heating section 4101.

[0097] In some embodiments, the tip 4103 is made of a material that does not respond to electromagnetic induction, which also avoids undesired temperature rise in the non-heated region of the aerosol-generating substrate 200.

[0098] In some embodiments, the heating needle 410 further comprises a temperature sensor 4104, which is disposed on the inner wall of the heating section 4101; the lead of the temperature sensor 4104 is led out through the hollow holes of the supporting section 4102 and the heating section 4101.

[0099] In some embodiments, the heating needle 410 further comprises a temperature sensor 4104, which is disposed at the connection position of the heating section 4101 and the supporting section 4102.

[0100] In some embodiments, the heating needle 410 further comprises a tip 4103 and a temperature sensor 4104, an end of the heating section 4101 away from the supporting section 4102 is formed as a closed end, the tip 4103 is fixed on the outer side of the closed end, and the temperature sensor 4104 is connected to the inner side of the closed end.

[0101] Reference Figures 7 to 10 as shown, for the temperature sensor 4104, it needs to be fixed at a specified position. One solution (such as Figure 9As shown, this involves welding the thermocouple to a designated position on the lower half. Another approach (such as...) Figure 10 (As shown) This illustrates the welding of thermocouples to the inner wall of the upper hollow tube, which can be heated by electromagnetic induction. This application employs a closed-loop heating control based on temperature measurement. Specifically, a temperature sensor 4104 is installed at a designated location to measure temperature changes in a specified area, providing real-time data for heating control.

[0102] One feasible implementation method: The temperature sensor 4104 is arranged on the inner wall of the heating section 4101, directly contacting and measuring the temperature of the heating section 4101 (e.g., Figure 10 (As shown).

[0103] Feasible Implementation Plan Two: If the top of the heating section 4101 is a riveted or welded sealed structure, the temperature sensor 4104 can be arranged on the sealed structure (e.g., Figure 7 , Figure 8 (As shown).

[0104] Feasible implementation scheme three: Arrange the temperature sensor 4104 in the connection area between the heating section 4101 and the support section 4102.

[0105] The temperature sensor 4104 is mainly fixed by welding and bonding. The process of welding the temperature sensor 4104 to the inner metal wall includes, but is not limited to, the following methods: PSWM inner wall overlay welding, resistance welding, laser welding, micro-beam plasma welding, and electron beam welding. The vertical pull-out force after welding is greater than 10N. The connecting lead of the temperature sensor 4104 is led out from the bottom of the heating pin 410 through the hollow hole and connected to the control circuit board 30.

[0106] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A heating needle for heating an aerosol-generating matrix, characterized in that, The heating needle includes: A heating section is adapted to dock with the heating medium region of the aerosol generating matrix, the heating section being made of a first material and adapted to generate heat under an alternating magnetic field to heat the heating medium region; A support section, connected to the heating section and adapted to dock with the non-heated medium region of the aerosol generating matrix, the support section being made of a second material; The second material is a material that does not respond to electromagnetic induction, and the thermal conductivity of the second material is lower than that of the first material.

2. The heating needle according to claim 1, characterized in that, The relative permeability of the first material is >200.

3. The heating needle according to claim 1, characterized in that, The thermal conductivity of the second material is ≤7W / (m·K).

4. The heating needle according to claim 1, characterized in that, The first material includes at least one of silicon steel, carbon steel, and nickel-chromium alloy; The second material includes at least one of PI, zirconium oxide, and titanium alloy.

5. The heating needle according to any one of claims 1-4, characterized in that, The heating section and the support section are connected and fixed at their junction.

6. The heating needle according to claim 5, characterized in that, The heating section and the supporting section are welded and fixed at their junction. The welding methods include brazing, laser welding, tungsten inert gas welding, and resistance welding.

7. The heating needle according to claim 5, characterized in that, After the junction of the heating section and the support section is welded, at least one of the following conditions must be met: The vertical pull-out force at the weld joint is greater than 30N; The airtightness of the weld joint must be at least level 7.

8. The heating needle according to any one of claims 1-4, characterized in that, The heating section is constructed as a hollow tubular structure.

9. The heating needle according to claim 8, characterized in that, The support section is constructed as a hollow tubular structure that is connected to the heating section.

10. The heating needle according to claim 9, characterized in that, The heating needle also includes a reinforcing rod, which is built into the heating section and the support section, and the heating section and the support section are connected by the reinforcing rod.

11. The heating needle according to claim 10, characterized in that, The reinforcing rod is a metal rod; the heating section is welded and fixed to the reinforcing rod, and the supporting section is riveted and fixed to the reinforcing rod.

12. The heating needle according to any one of claims 1-4, characterized in that, It also includes a pointed end, which is located at the end of the heating section away from the support section.

13. The heating needle according to claim 12, characterized in that, The tip is made of a material that does not respond to electromagnetic induction.

14. The heating needle according to claim 9, characterized in that, The heating needle also includes a temperature sensor, which is disposed on the inner wall of the heating section; the lead wire of the temperature sensor is led out from the hollow hole of the support section and the heating section.

15. The heating needle according to claim 9, characterized in that, The heating needle also includes a temperature sensor, which is located at the connection point between the heating section and the support section.

16. The heating needle according to claim 9, characterized in that, The heating needle also includes a tip and a temperature sensor. The end of the heating section away from the support section is formed as a closed end. The tip is fixed to the outside of the closed end, and the temperature sensor is connected to the inside of the closed end.

17. A heating device, characterized in that, include: Heating needle as described in any one of claims 1-16; and An electromagnetic coil is disposed on the outer periphery of the heating section to generate an alternating magnetic field.

18. The heating device according to claim 17, characterized in that, The electromagnetic coil is helical in shape, and the pitch is non-uniformly distributed.

19. The heating device according to claim 18, characterized in that, The diameter of the electromagnetic coil is D, and the pitch varies from 0D to 3D.

20. The heating device according to claim 17, characterized in that, It also includes a base, and the end of the support section away from the heating section is fixed to the base.

21. The heating device according to claim 20, characterized in that, It also includes a bracket for mounting the electromagnetic coil, and the bracket is connected to the base.

22. The heating device according to claim 21, characterized in that, The bracket and the base are provided with interlocking structures that cooperate with each other.

23. The heating device according to claim 21, characterized in that, The electromagnetic coil is embedded in the bracket.

24. The heating device according to claim 23, characterized in that, The electromagnetic coil is an LDS coil formed on the inner wall of the support.

25. An aerosol generating device, characterized in that, include: The heating device according to any one of claims 17-24; Battery; and A control circuit board is connected between the battery and the heating device.

26. The aerosol generating apparatus according to claim 25, characterized in that, The control circuit board is equipped with a boost circuit connected between the battery and the electromagnetic coil to increase the power supply voltage of the electromagnetic coil.

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