A heating method and device for a microwave heating non-combustion smoking set

Abstract

The application provides a heating method and device of a microwave heating non-combustion smoking set, and relates to the technical field of microwave heating.The metal needle shell is arranged in the peripheral transducer, and the metal needle shell is arranged to penetrate into the inside of the cigarette tobacco section; after microwave energy is fed into the peripheral transducer, the skin effect of the microwave signal is relied on, and then the electromagnetic field energy in the peripheral transducer is offset to the area where the metal needle shell is located, the original field strength distribution mode is optimized, and finally the uniform heating of the cigarette tobacco section is completed.The method can effectively eliminate the central energy depression of the peripheral microwave heating, improve the heating uniformity of the cigarette, make the cigarette receive the microwave energy more uniformly, and ensure the smoking experience.

Description

Technical Field

[0001] This invention relates to the field of microwave heating technology, and in particular to a heating method and apparatus for microwave-heated non-combustible smoke appliances. Background Technology

[0002] Low-temperature heated tobacco products are made from traditional tobacco leaves through a special process. Because they have a lower smoke generation and operating temperature compared to open-flame lit tobacco, they significantly reduce the release of harmful substances from the tobacco and avoid the complex chemical reactions of tobacco substances caused by high-temperature combustion at open flame temperatures. Therefore, the types and absolute amounts of harmful substances in the smoke are extremely low. Microwave-heated tobacco devices use microwave energy to create a strong electromagnetic field in a resonant cavity. This causes polar molecules in the effective substances of the cigarette to polarize and align. The friction generated during molecular flipping promotes the release of volatile effective substances from the tobacco.

[0003] Microwave-heated smoking devices typically employ peripheral heating, where peripheral transducers located inside a resonant cavity radiate microwave energy to heat the inserted tobacco segment of the cigarette from the outside in. However, due to the limitations imposed by the resonant cavity's boundary conditions on the electromagnetic field distribution within the peripheral transducer, energy is concentrated primarily in the area near the inner wall of the transducer, while the field strength in the central region is extremely weak, creating an "energy depression." This uneven energy distribution results in the central portion of the cigarette tobacco segment receiving less microwave energy, easily leading to a "hot core" phenomenon—where the outer layer of tobacco is fully heated while the central tobacco remains at a low temperature, severely impacting the smoking experience. Summary of the Invention

[0004] This invention provides a heating method and apparatus for microwave-heated non-combustible tobacco products, which solves the problem that the tobacco shreds in the central area of ​​the cigarette tobacco segment remain at a low temperature due to the extremely weak field strength in the axial region of the peripheral transducer, resulting in an energy depression.

[0005] This invention provides a heating method and apparatus for microwave-heated non-combustible smoke appliances, the method comprising: Microwave energy is fed into the peripheral transducer, and the skin effect of the microwave signal is used to deflect the electromagnetic field energy inside the peripheral transducer toward the metal needle shell inside the peripheral transducer. Heating of the tobacco segment is achieved by utilizing the electromagnetic field energy surrounding the metal needle shell.

[0006] In one possible implementation, utilizing the skin effect of microwave signals to deflect the electromagnetic field energy inside the peripheral transducer towards the metal needle shell inside the peripheral transducer includes: Based on the skin effect of microwave signals, current is generated on the outer surface of the metal needle shell. Based on the current accumulation generated on the surface of the metal needle shell, the electromagnetic field energy inside the peripheral transducer shifts towards the position of the metal needle shell to compensate for the energy depression of the peripheral transducer at the metal needle shell.

[0007] In one possible implementation, the shifting of electromagnetic field energy within the peripheral transducer towards the position of the metal needle shell based on the current accumulation generated on the surface of the metal needle shell includes: Based on the energy accumulation formed on the outer surface of the metal needle shell, a potential difference is formed between the outer surface of the metal needle shell and the radial points of the peripheral transducers; The electromagnetic field energy is drawn toward the metal needle shell by the potential difference.

[0008] In one possible implementation, feeding microwave energy into the peripheral transducer further includes: Temperature data of the tobacco segment is collected by a temperature sensor installed inside the metal needle shell; Based on the air pressure acquisition channel and air pressure sensor inside the metal needle shell, the air pressure change data of the resonant cavity outside the peripheral transducer is collected. The microwave energy fed into the peripheral transducer is dynamically adjusted based on the temperature data and the air pressure change data.

[0009] In one possible implementation, the metal needle shell has a hollow inner cavity, and a pressure acquisition hole is formed on the side wall of the metal needle shell; the hollow inner cavity and the pressure acquisition hole form the pressure acquisition channel; the aperture of the pressure acquisition hole is smaller than one-quarter wavelength of the microwave energy fed into the peripheral transducer, to prevent microwave energy from entering the interior of the metal needle shell through the pressure acquisition hole; the acquisition of temperature data of the tobacco segment through a temperature sensor disposed inside the metal needle shell includes: The metal needle shell generates an equipotential shielding effect in the peripheral transducer, thus preventing the electromagnetic field within the peripheral transducer from interfering with the temperature sensor.

[0010] This invention provides a heating method for a microwave-heated non-combustible tobacco device. The method involves placing a metal needle shell inside a peripheral transducer, which penetrates the tobacco segment of a cigarette. After microwave energy is fed into the peripheral transducer, the skin effect of the microwave signal causes a high-frequency current to concentrate on the outer surface of the metal needle shell, accumulating potential. This creates a significant potential difference between the metal needle shell and the radial points of the peripheral transducer, thereby drawing the electromagnetic field energy inside the peripheral transducer towards the area containing the metal needle shell. This optimizes the original field strength distribution and ultimately achieves uniform heating of the tobacco segment of the cigarette. This method effectively eliminates the central energy depression in peripheral microwave heating, improves the uniformity of cigarette heating, and ensures that the cigarette receives microwave energy more evenly, guaranteeing a superior smoking experience.

[0011] This invention also provides a heating device for a microwave-heated non-combustible smoke appliance, employing a heating method for the microwave-heated non-combustible smoke appliance. The heating device includes: Resonant cavity; A peripheral transducer, located inside the resonant cavity, is used to receive microwave energy and radiate microwave energy to the tobacco segment of a cigarette placed inside it. A metal needle shell is disposed inside the peripheral transducer and is used to penetrate the interior of the tobacco segment. The metal needle shell utilizes the skin effect of microwave signals to deflect the electromagnetic field energy inside the peripheral transducer toward the position of the metal needle shell, thereby achieving heating of the interior of the tobacco segment.

[0012] In one possible implementation, the metal needle shell is disposed at the bottom of the resonant cavity and is electrically connected to the resonant cavity; the inner walls of the metal needle shell and the peripheral transducer are coated with a nano-coating to prevent the condensation and adhesion of volatile substances from cigarettes.

[0013] In one possible implementation, a pressure sensor is provided at the bottom of the resonant cavity. The pressure sensor is connected to the pressure acquisition channel inside the metal needle shell. The pressure sensor is used to acquire suction action signals, suction depth, and suction flow rate data.

[0014] In one possible implementation, a control module is provided on one side of the resonant cavity, and a temperature sensor is provided inside the metal needle shell; the control module is electrically connected to the temperature sensor, the pressure sensor and the microwave source respectively, and the control module is used to dynamically adjust the power of the microwave source fed into the peripheral transducer according to the data fed back by the temperature sensor and the pressure sensor.

[0015] In one possible implementation, the resonant cavity is a semi-closed cavity with one end open; the heating device further includes: A guide positioning ring is disposed at the open end of the resonant cavity to guide the cigarette into the peripheral transducer and ensure that the top of the peripheral transducer is concentric with the resonant cavity. An inner positioning ring is disposed at the bottom of the resonant cavity to support the peripheral transducer and ensure that the bottom of the peripheral transducer is concentric with the resonant cavity; The peripheral transducer is fixed inside the resonant cavity by the guide positioning ring and the inner positioning ring. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic flowchart of a microwave-heated non-combustible smoke appliance provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the heating device for a microwave-heated non-combustible smoke appliance provided in an embodiment of the present invention.

[0018] In the diagram: 1. Tobacco section; 2. Guide positioning ring; 3. Resonant cavity; 4. Inner positioning ring; 5. Peripheral transducer; 6. Filter section; 7. Metal needle shell; 8. Air pressure acquisition hole; 9. Control module; 10. Air pressure sensor; 11. Microwave energy feed lead; 12. Temperature sensor lead; 13. Temperature sensor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown, this embodiment of the invention provides a heating method and apparatus for microwave-heated non-combustible smoke appliances. The method includes steps S101-S102.

[0021] S101. Feed microwave energy into the peripheral transducer 5 and use the skin effect of the microwave signal to deflect the electromagnetic field energy inside the peripheral transducer 5 toward the metal needle shell 7 inside the peripheral transducer 5.

[0022] For example, the microwave energy generated by the microwave source is transmitted to the peripheral transducer 5 through the feed lead. The metal pattern printed on the outer surface of the peripheral transducer 5 radiates an electromagnetic field into the interior of the peripheral transducer 5 under microwave excitation. When the metal needle shell 7 is disposed inside the peripheral transducer 5 and electrically connected to the resonant cavity 3, the microwave signal acts on the surface of the metal needle shell 7. Due to the skin effect, the high-frequency current is concentrated in a very thin layer on the outer surface of the metal needle shell 7, resulting in significant current accumulation on the surface of the needle shell. This current accumulation changes the original electromagnetic field boundary conditions inside the peripheral transducer 5, causing the electromagnetic field energy, which was originally mainly distributed near the inner wall of the peripheral transducer 5, to redistribute and shift towards the location of the metal needle shell 7. Optionally, the length of the metal needle shell 7 is less than or equal to 6 mm and does not exceed half the length of the cigarette tobacco segment 1. The top is a closed tip, and the upper half is provided with an inner shrinking ring. A pressure collection hole 8 is opened in the groove of the inner shrinking ring to adapt to the compact space of the microwave-heated tobacco device and to take into account the convenience of daily cleaning and maintenance.

[0023] S102. Heating of the interior of tobacco segment 1 is achieved based on the electromagnetic field energy around the metal needle shell 7.

[0024] For example, after the metal needle shell 7 pierces the tobacco segment 1 of a cigarette, the electromagnetic field energy gathered around it directly acts on the tobacco segment 1 near the needle shell. The skin effect creates energy accumulation on the outer surface of the metal needle shell 7, forming a potential difference between the outer surface of the needle shell and the radial points of the inner wall of the peripheral transducer 5. This potential difference draws the electromagnetic field energy towards the needle shell region, compensating for the energy depression in the original axial region of the peripheral transducer 5. At this time, the electromagnetic field energy is no longer concentrated only near the inner wall of the peripheral transducer 5, but forms a more uniform distribution pattern on the cross-section inside the peripheral transducer 5. This ensures that the metal needle shell 7 piercing the tobacco segment 1 and its surrounding area receive sufficient microwave radiation, achieving synchronous heating of the entire tobacco segment 1 from the inside out, effectively eliminating the "centering phenomenon".

[0025] As one possible implementation, step S101 can be specifically implemented as steps S1011-S1015.

[0026] S1011. Based on the skin effect of microwave signals, current is generated on the outer surface of the metal needle shell 7.

[0027] For example, when microwave energy is fed into the peripheral transducer 5, a high-frequency alternating electromagnetic field is formed inside the peripheral transducer 5. The metal needle shell 7, as a good conductor, is placed in this electromagnetic field. The high-frequency electromagnetic field acts on the surface of the metal needle shell 7, and free electrons oscillate under the drive of the alternating electric field. Due to the skin effect, the high-frequency current is mainly concentrated within the extremely thin skin depth on the outer surface of the metal needle shell 7, forming a surface current accumulation. The value of the skin depth is determined by both the microwave frequency and the conductivity of the metal needle shell 7 material. The higher the microwave frequency and the greater the conductivity, the smaller the skin depth and the more significant the surface current accumulation phenomenon, thereby forming a high-density surface current layer on the surface of the metal needle shell 7.

[0028] S1012. Based on the current accumulation generated on the surface of the metal needle shell 7, the electromagnetic field energy inside the peripheral transducer 5 shifts to the position of the metal needle shell 7 to compensate for the energy depression of the peripheral transducer 5 at the metal needle shell 7.

[0029] For example, the current accumulation on the surface of the metal needle shell 7 alters the boundary conditions of the original electromagnetic field. Without the metal needle shell 7, the electromagnetic field energy inside the peripheral transducer 5 is mainly concentrated near the inner wall of the peripheral transducer 5, with extremely weak field strength in the axial region, forming an energy depression. When current accumulates on the surface of the metal needle shell 7, this current accumulates around the needle shell, forming an additional electromagnetic field component. This additional component superimposes with the original electromagnetic field, causing some of the energy originally concentrated towards the inner wall of the peripheral transducer 5 to be "drawn" to the axial region where the needle shell is located, thereby improving the uniformity of energy distribution across the cross-section inside the peripheral transducer 5. Optionally, the metal needle shell 7 is disposed at the bottom of the resonant cavity 3 and electrically connected to the resonant cavity 3, serving as a passive grounding structure, which can provide a clear potential reference surface, enhancing the controllability and consistency of current accumulation.

[0030] As one possible implementation, step S1012 can be specifically implemented as steps S10121-S10122.

[0031] S10121. Based on the energy accumulation formed on the outer surface of the metal needle shell 7, a potential difference is formed between the outer surface of the metal needle shell 7 and the radial points of the surrounding transducers 5.

[0032] For example, the skin effect causes surface current accumulation, which alters the charge distribution on the outer surface of the metal needle shell 7, creating a specific potential distribution on the outer surface. Since the metal needle shell 7 is electrically connected to the resonant cavity 3 and is at ground potential, while the metal pattern on the inner wall of the peripheral transducer 5 has a higher radio frequency potential under microwave excitation, a significant potential difference is formed between the two in the radial direction. The amplitude of this potential difference is determined by both the fed microwave power and the current density on the needle shell surface, providing an electric field driving force for the deflection of electromagnetic field energy towards the needle shell.

[0033] S10122. Electromagnetic field energy is drawn to the metal needle shell 7 through potential difference.

[0034] For example, driven by the potential difference between the outer surface of the metal needle shell 7 and the radial points of the peripheral transducer 5, the electromagnetic field energy originally concentrated near the inner wall of the peripheral transducer 5 is shifted radially towards the surface of the needle shell, resulting in a higher field strength in the area surrounding the needle shell. This compensates for the original energy depression in the axial region and improves the overall heating uniformity of the cigarette tobacco segment 1. Optionally, when the metal pattern of the peripheral transducer 5 is asymmetrical or non-uniformly arranged, the metal needle shell 7 can be set at an eccentric position at the bottom of the resonant cavity 3, and by optimizing the circumferential pattern shape, the electromagnetic field energy can also be drawn towards and uniformly distributed in the area where the needle shell is located.

[0035] S1013, please refer to Figure 2 Temperature data of tobacco segment 1 is collected by temperature sensor 13 installed inside metal needle shell 7.

[0036] For example, the metal needle shell 7 has a hollow structure, and a temperature sensor 13 is located inside it near the closed tip. The temperature sensor 13 is bonded to the inner wall of the needle shell near the tip region through a highly thermally conductive interface material, forming good thermal coupling with the needle shell. When the needle shell pierces into the tobacco segment 1, the heat of the tobacco segment 1 is conducted to the internal temperature sensor 13 through the thin wall of the metal needle shell 7, enabling the sensor to collect temperature data of the central area of ​​the tobacco segment 1 in real time. At the same time, the metal outer shell of the metal needle shell 7 generates an equipotential shielding effect in the electromagnetic field, shielding the hollow cavity where the temperature sensor 13 is located from the electromagnetic field, effectively avoiding interference from strong electromagnetic fields on the signal acquisition of the temperature sensor 13, and ensuring the accuracy and stability of the temperature data. Optionally, the temperature sensor 13 can be a thermocouple or a thermistor.

[0037] S1014, please refer to Figure 2 Based on the air pressure acquisition channel and air pressure sensor 10 inside the metal needle shell 7, the air pressure change data of the resonant cavity 3 outside the peripheral transducer 5 is collected.

[0038] For example, the metal needle shell 7 has a hollow structure with a hollow inner cavity. A pressure acquisition hole 8 is provided on the side wall of the needle shell. The hollow inner cavity and the pressure acquisition hole 8 together form a pressure acquisition channel, connecting the inside of the metal needle shell 7 to the outside of the resonant cavity 3. When the user inhales, a low pressure is generated inside the peripheral transducer 5. This low pressure change enters the hollow inner cavity of the metal needle shell 7 through the pressure acquisition hole 8 and is transmitted along the pressure acquisition channel to the pressure sensor 10 outside the resonant cavity 3. The pressure sensor 10 detects the pressure change data in real time, including the inhalation action signal, inhalation depth, and inhalation flow rate. Optionally, the aperture of the pressure acquisition hole 8 is less than one-quarter of the wavelength of microwave energy. The microwave cutoff principle is used to prevent microwave energy from entering the inside of the metal needle shell 7 through the pressure acquisition hole 8, avoiding interference with the temperature sensor 13. Simultaneously, the inward-shrinking ring in the upper part of the needle shell effectively prevents tobacco from clogging the pressure acquisition hole 8.

[0039] S1015. Based on temperature data and air pressure change data, dynamically adjust the microwave energy fed into the peripheral transducer 5.

[0040] For example, the control module 9 is electrically connected to the temperature sensor 13, the air pressure sensor 10, and the microwave source, respectively, and receives temperature data collected by the temperature sensor 13 and air pressure change data collected by the air pressure sensor 10. The control module 9 determines whether the actual heating temperature of the current tobacco segment 1 has reached the target temperature range based on the temperature data, and simultaneously determines whether the user is smoking and the current smoking intensity based on the air pressure change data. When a user smoking action is detected, the control module 9 increases the microwave power fed into the peripheral transducer 5 of the microwave source in a timely manner based on the smoking depth and flow rate data to ensure the full release of effective substances in the tobacco during smoking; when no smoking action is detected, the control module 9 reduces or pauses the microwave energy output to reduce energy consumption and avoid overheating of the tobacco. Optionally, the control module 9 constructs a multi-physical quantity digital model of the cigarette during the heating process based on the temperature data and air pressure change data, and adjusts the microwave energy output parameters in real time based on this digital model to ensure uniform release of effective substances in the cigarette and achieve precise temperature control.

[0041] In one embodiment, the metal needle shell 7 has a hollow inner cavity, and a pressure acquisition hole 8 is opened on the side wall of the metal needle shell 7; the hollow inner cavity and the pressure acquisition hole 8 form a pressure acquisition channel; the aperture of the pressure acquisition hole 8 is smaller than one-quarter wavelength of the microwave energy fed into the peripheral transducer 5, so as to prevent microwave energy from entering the interior of the metal needle shell 7 through the pressure acquisition hole 8; based on the equipotential shielding effect generated by the metal needle shell 7 in the peripheral transducer 5, the electromagnetic field in the peripheral transducer 5 is avoided from interfering with the temperature sensor 13.

[0042] For example, the hollow inner cavity of the metal needle shell 7 and the air pressure acquisition hole 8 together constitute a complete air pressure acquisition channel, which extends from near the closed tip of the needle shell to the outside of the resonant cavity 3. The aperture of the air pressure acquisition hole 8 is designed to be less than one-quarter of the wavelength of microwave energy. According to the microwave cutoff waveguide theory, when the aperture size is much smaller than the microwave wavelength, microwave energy cannot propagate effectively through the hole and is thus blocked outside the metal needle shell 7, ensuring that the electromagnetic field will not enter the interior of the needle shell along the air pressure acquisition channel. At the same time, the metal needle shell 7, as a good conductor, forms an equipotential body in the electromagnetic field. The hollow inner cavity is surrounded by the metal shell, forming a shielding structure similar to a Faraday cage, which protects the temperature sensor 13 placed inside the needle shell from radiation interference from strong external electromagnetic fields, ensuring that the temperature sensor 13 can stably and accurately acquire the temperature data of the tobacco segment 1 during microwave heating.

[0043] like Figure 2 As shown, the present invention also provides a heating device for a microwave-heated non-combustible smoke appliance, which employs a microwave-heated non-combustible smoke appliance heating method. The device includes: Resonant cavity 3.

[0044] The peripheral transducer 5 is located inside the resonant cavity 3 and is used to receive microwave energy and radiate microwave energy to the tobacco segment 1 of the cigarette placed inside it.

[0045] The metal needle shell 7 is located inside the peripheral transducer 5 and is used to penetrate the interior of the tobacco segment 1. The metal needle shell 7 uses the skin effect of microwave signals to deflect the electromagnetic field energy inside the peripheral transducer 5 toward the position of the metal needle shell 7, so as to heat the interior of the tobacco segment 1.

[0046] For example, the resonant cavity 3 is a semi-closed cavity with one end open. Its inner diameter is smaller than the cutoff wavelength of the microwave operating frequency, preventing microwaves from forming a propagation state inside the resonant cavity 3. Instead, it forms a standing wave distribution only in the cross-sectional direction, confining the energy inside the cavity and preventing leakage from the open end. The peripheral transducer 5 is a thin-walled circular tube made of glass, with a specific metal pattern printed on its outer surface. This metal pattern is connected to the microwave energy feed lead 11. The metal needle shell 7 is located at the bottom of the resonant cavity 3 and is electrically connected to the resonant cavity 3. The axial position of the needle shell coincides with the central axis of the peripheral transducer 5. When a cigarette is inserted into the peripheral transducer 5, the metal needle shell 7 pierces the center of the cigarette tobacco segment 1. Microwave energy is transmitted to the metal pattern of the peripheral transducer 5 through the feed lead, exciting the peripheral transducer 5 to establish an electromagnetic field inside the resonant cavity 3. The metal needle shell 7 utilizes the skin effect to deflect the electromagnetic field energy towards the axis of the needle shell, achieving uniform heating of the cigarette tobacco segment 1 from the inside out.

[0047] In some embodiments of the heating device for a microwave-heated non-combustible smoke appliance provided in this application, please refer to... Figure 2The metal needle shell 7 is located at the bottom of the resonant cavity 3 and is electrically connected to the resonant cavity 3; the inner walls of the metal needle shell 7 and the surrounding transducers 5 are coated with a nano-coating to prevent the condensation and adhesion of volatile substances from cigarettes.

[0048] For example, the metal needle shell 7 and the bottom of the resonant cavity 3 can be fixed by means of threaded connection, bonding, pressing, welding, or integral processing to ensure good electrical conductivity between the two, so that the metal needle shell 7 has a definite grounding potential in the electromagnetic field. The nano-coating has oleophobic and hydrophobic properties, so the volatile substances released by the cigarette during heating are not easily condensed and adhered to the surface of the needle shell and the inner wall of the transducer, which facilitates wiping and cleaning after use, reduces tar and soot residue, avoids the generation of tar odor during continuous use, and ensures the long-term use effect of the smoking device.

[0049] In some embodiments of the heating device for a microwave-heated non-combustible smoke appliance provided in this application, please refer to... Figure 2 A pressure sensor 10 is provided at the bottom of the resonant cavity 3. The pressure sensor 10 is connected to the pressure acquisition channel inside the metal needle shell 7. The pressure sensor 10 is used to collect suction action signals, suction depth and suction flow data.

[0050] For example, the pressure sensor 10 is mounted on the circuit assembly board at the bottom of the resonant cavity 3, located directly below or to the side of the bottom end of the metal needle shell 7, and is connected to the pressure acquisition channel inside the metal needle shell 7 through a sealed air passage. When the user inhales, a pressure difference is formed between the interior of the peripheral transducer 5 and the external environment. This pressure difference is transmitted to the pressure sensor 10 through the pressure acquisition channel inside the metal needle shell 7. The pressure sensor 10 converts this pressure change into an electrical signal and outputs it to the control module 9. The control module 9 calculates the user's inhalation action signal, inhalation depth, and inhalation flow rate based on the amplitude and rate of change of the pressure signal, providing a basis for dynamically adjusting the microwave energy output. Optionally, the pressure sensor 10 can be a MEMS pressure sensor chip.

[0051] In some embodiments of the heating device for a microwave-heated non-combustible smoke appliance provided in this application, please refer to... Figure 2 A control module 9 is provided on one side of the resonant cavity 3, and a temperature sensor 13 is provided inside the metal needle shell 7. The control module 9 is electrically connected to the temperature sensor 13, the air pressure sensor 10 and the microwave source respectively. The control module 9 is used to dynamically adjust the power of the microwave source fed into the peripheral transducer 5 according to the data fed back by the temperature sensor 13 and the air pressure sensor 10.

[0052] For example, the control module 9 includes a microcontroller and peripheral circuitry, mounted on a circuit board outside the resonant cavity 3. The signal lead of the temperature sensor 13 extends from the bottom of the metal needle housing 7 and connects to the analog-to-digital converter interface of the control module 9; the signal output of the pressure sensor 10 is also connected to the control module 9. The control module 9 has a built-in control algorithm that calculates the required microwave power adjustment based on the difference between the real-time temperature of the tobacco segment 1 fed back by the temperature sensor 13 and the preset target temperature, using PID control or other closed-loop control algorithms. Simultaneously, it combines the suction action signal fed back by the pressure sensor 10 to determine the heating stage and user needs, outputting a pulse width modulation signal or analog control signal to the microwave source to dynamically adjust the output power of the microwave source.

[0053] It should be noted that the peripheral transducer 5 is powered by the microwave energy feed lead 11, and the temperature sensor 13 is connected to the control module 9 through the temperature sensor lead 12. The upper end of the tobacco section 1 is the tobacco filter section 6.

[0054] In some embodiments of the heating device for a microwave-heated non-combustible smoke appliance provided in this application, please refer to... Figure 2 The resonant cavity 3 is a semi-closed cavity with one end open; the heating device also includes: The guide positioning ring 2 is located at the open end of the resonant cavity 3 and is used to guide the cigarette into the peripheral transducer 5 and ensure that the top of the peripheral transducer 5 is concentric with the resonant cavity 3.

[0055] The inner positioning ring 4 is located at the bottom of the resonant cavity 3 to support the peripheral transducer 5 and ensure that the bottom of the peripheral transducer 5 is concentric with the resonant cavity 3.

[0056] The peripheral transducer 5 is fixed inside the resonant cavity 3 by the guide positioning ring 2 and the inner positioning ring 4.

[0057] For example, the guide positioning ring 2 is an annular structure with a gradually decreasing inner diameter. Its inner diameter gradually decreases from the open end of the resonant cavity 3 towards the inside, matching the outer diameter of the peripheral transducer 5. When the user inserts a cigarette from the open end of the resonant cavity 3, the gradually decreasing inner wall of the guide positioning ring 2 guides the cigarette smoothly into the peripheral transducer 5, preventing the cigarette from tilting or deviating from the center and causing damage to the tobacco segment 1. Simultaneously, the guide positioning ring 2 fixes the upper end of the peripheral transducer 5 to the central axis of the resonant cavity 3. The inner positioning ring 4 is located at the bottom of the resonant cavity 3 and has a central through-hole for the metal needle shell 7 to pass through and a clearance through-hole for the microwave energy feeding lead 11 to pass through. The inner positioning ring 4 also fixes the lower end of the peripheral transducer 5 to the central axis of the resonant cavity 3, ensuring that the peripheral transducer 5 and the resonant cavity 3 remain concentric. Optionally, the guide positioning ring 2 and the inner positioning ring 4 are respectively provided with ventilation holes or air passage grooves to provide a smooth airflow path after the cigarette is inserted, reduce the airflow resistance from the tobacco section 1 to the filter section 6, and ensure smooth smoking for the user.

[0058] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A heating method for a microwave-heated non-combustible smoke appliance, characterized in that, include: Microwave energy is fed into the peripheral transducer, and the skin effect of the microwave signal is used to deflect the electromagnetic field energy inside the peripheral transducer toward the metal needle shell inside the peripheral transducer. Heating of the tobacco segment is achieved by utilizing the electromagnetic field energy surrounding the metal needle shell.

2. The heating method for a microwave-heated non-combustible smoke appliance according to claim 1, characterized in that, The method of utilizing the skin effect of microwave signals to deflect the electromagnetic field energy inside the peripheral transducer towards the metal needle shell inside the peripheral transducer includes: Based on the skin effect of microwave signals, current is generated on the outer surface of the metal needle shell. Based on the current accumulation generated on the surface of the metal needle shell, the electromagnetic field energy inside the peripheral transducer shifts towards the position of the metal needle shell to compensate for the energy depression of the peripheral transducer at the metal needle shell.

3. The heating method for a microwave-heated non-combustible smoke appliance according to claim 2, characterized in that, The process of shifting the electromagnetic field energy inside the peripheral transducer towards the position of the metal needle shell based on the current accumulation generated on the surface of the metal needle shell includes: Based on the energy accumulation formed on the outer surface of the metal needle shell, a potential difference is formed between the outer surface of the metal needle shell and the radial points of the peripheral transducers; The electromagnetic field energy is drawn toward the metal needle shell by the potential difference.

4. The heating method for a microwave-heated non-combustible smoke appliance according to claim 1, characterized in that, The feeding of microwave energy into the peripheral transducer further includes: Temperature data of the tobacco segment is collected by a temperature sensor installed inside the metal needle shell; Based on the air pressure acquisition channel and air pressure sensor inside the metal needle shell, the air pressure change data of the resonant cavity outside the peripheral transducer is collected. The microwave energy fed into the peripheral transducer is dynamically adjusted based on the temperature data and the air pressure change data.

5. The heating method for a microwave-heated non-combustible smoke appliance according to claim 4, characterized in that, The metal needle shell has a hollow inner cavity, and the side wall of the metal needle shell has a pressure collection hole; the hollow inner cavity and the pressure collection hole form the pressure collection channel; the aperture of the pressure collection hole is smaller than one-quarter wavelength of the microwave energy fed into the peripheral transducer, so as to prevent microwave energy from entering the interior of the metal needle shell through the pressure collection hole; The temperature data of the tobacco segment is collected by a temperature sensor installed inside the metal needle shell, including: The metal needle shell generates an equipotential shielding effect in the peripheral transducer, thus preventing the electromagnetic field within the peripheral transducer from interfering with the temperature sensor.

6. A heating device for a microwave-heated non-combustible smoke appliance, characterized in that, The heating method of the microwave-heated non-combustible smoke appliance according to any one of claims 1-5, wherein the heating device comprises: Resonant cavity; A peripheral transducer, located inside the resonant cavity, is used to receive microwave energy and radiate microwave energy to the tobacco segment of a cigarette placed inside it. A metal needle shell is disposed inside the peripheral transducer and is used to penetrate the interior of the tobacco segment. The metal needle shell utilizes the skin effect of microwave signals to deflect the electromagnetic field energy inside the peripheral transducer toward the position of the metal needle shell, thereby achieving heating of the interior of the tobacco segment.

7. The heating device for a microwave-heated non-combustible smoke appliance according to claim 6, characterized in that, The metal needle shell is disposed at the bottom of the resonant cavity and is electrically connected to the resonant cavity; the inner walls of the metal needle shell and the peripheral transducer are coated with a nano-coating to prevent the condensation and adhesion of volatile substances from cigarettes.

8. The heating device for a microwave-heated non-combustible smoke appliance according to claim 6, characterized in that, A pressure sensor is provided at the bottom of the resonant cavity. The pressure sensor is connected to the pressure acquisition channel inside the metal needle shell. The pressure sensor is used to acquire suction action signals, suction depth, and suction flow rate data.

9. The heating device for a microwave-heated non-combustible smoke appliance according to claim 8, characterized in that, A control module is provided on one side of the resonant cavity, and a temperature sensor is installed inside the metal needle shell. The control module is electrically connected to the temperature sensor, the pressure sensor and the microwave source respectively. The control module is used to dynamically adjust the power of the microwave source fed into the peripheral transducer according to the data fed back by the temperature sensor and the pressure sensor.

10. The heating device for a microwave-heated non-combustible smoke appliance according to claim 6, characterized in that, The resonant cavity is a semi-closed cavity with one end open; the heating device also includes: A guide positioning ring is disposed at the open end of the resonant cavity to guide the cigarette into the peripheral transducer and ensure that the top of the peripheral transducer is concentric with the resonant cavity. An inner positioning ring is disposed at the bottom of the resonant cavity to support the peripheral transducer and ensure that the bottom of the peripheral transducer is concentric with the resonant cavity; The peripheral transducer is fixed inside the resonant cavity by the guide positioning ring and the inner positioning ring.

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