Electromagnetic circumferential heating type smoking set

Abstract

The invention discloses an electromagnetic circumferential heating type smoking set, which belongs to the technical field of heating cigarettes and comprises a power supply, a control circuit and an electromagnetic heating component, the electromagnetic heating assembly comprises a receptor and an induction coil, the receptor is of a cylindrical structure with at least one open end, and the receptor generates heat energy in an alternating magnetic field generated by the induction coil and is used for heating a cigarette arranged in the receptor. And the receptor at least surrounds a part of the cigarette along the axial length. According to the invention, the numerical range of the wall thickness sigma of the receptor, the frequency f of the alternating magnetic field and the penetration depth delta of the alternating magnetic field on the receptor is reasonably set, the influence of the penetration depth on the electromagnetic circumferential heating efficiency can be balanced, the fuming effect is excellent, and the energy efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of heated cigarettes, and more specifically, to an electromagnetic circumferentially heated smoking device. Background Art

[0002] Smoking articles, such as cigarettes and cigars, release tobacco smoke by burning tobacco during use. In order to find alternatives to these burning tobacco products, researchers have tried to develop products that can release compounds without burning. Such products, such as heating packs, generate aerosols by heating rather than burning inhalable materials. One type of aerosol generating system currently on the market is the so-called electrically heated non-burning smoking device, which is used in conjunction with a consumable product in the form of a cigarette stick inserted therein.

[0003] In terms of heating methods, the heating cigarette devices on the market mainly use the principle of resistance heating, including inner core heating, outer periphery heating and internal and external mixed heating. However, there is a problem with resistance heating: during the heating process, the tobacco medium close to the heating element is easily overheated, while the tobacco medium far away from the heating element is difficult to fully heat, resulting in uneven heating of the aerosol-generating product. In order to solve this problem, electromagnetic induction heating has been proposed as an efficient heating technology and is considered to be a more ideal choice. The working principle of electromagnetic induction heating is: when alternating current passes through the inductor (usually a coil), an alternating magnetic field is generated, and the magnetically conductive object cuts the magnetic lines of force in the magnetic field, thereby generating eddy currents inside the object. These eddy currents cause the atoms inside the object to move irregularly at high speed, generate heat energy through collision and friction between atoms, and then heat the aerosol-generating product therein. Electromagnetic circumferential heating achieves uniform heating around the heated object through the magnetic field generated around it. This method can ensure that the object is heated in multiple directions at the same time, thereby achieving a more uniform heating effect.

[0004] Although electromagnetic circumferential heating smoking devices have the advantage of uniform heating, they also have problems such as long preheating time and high energy consumption. The heating principle of the sensor of circumferential heating smoking devices is also more complicated than that of internal heating. Therefore, how to balance the influence of penetration depth on the efficiency of electromagnetic circumferential heating and select appropriate induction heating elements accordingly has become a technical problem that needs to be solved in this field. Summary of the invention

[0005] One object of the present invention is to provide an electromagnetic circumferential heating smoking device to solve the aforementioned problems of long preheating time and high energy consumption.

[0006] According to a first aspect of the present invention, there is provided an electromagnetic circumferential heating smoking device, comprising a power supply, a control circuit and an electromagnetic heating component; wherein the power supply is electrically connected to the electromagnetic heating component and the control circuit respectively, and the power supply supplies power to the electromagnetic heating component under the control of the control circuit; the electromagnetic heating component comprises a receptor and an induction coil, wherein the receptor has a cylindrical structure with at least one end open, wherein the receptor generates heat energy in the alternating magnetic field generated by the induction coil for heating a cigarette placed inside the receptor, and wherein the receptor surrounds at least a portion of the cigarette along its axial length.

[0007] Optionally, the electromagnetic circumferential heating smoking device further comprises a shell, and the shell is used to accommodate the control circuit, the power supply and the electromagnetic heating component.

[0008] Optionally, the wall thickness of the susceptor is set to σ, and σ satisfies the following conditions:

[0009] ;

[0010] Wherein, σ is the wall thickness of the receptor, and the corresponding unit is mm; ρ is the conductivity of the receptor, and the corresponding unit is Ω.cm; μ r is the relative magnetic permeability of the receptor, which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the corresponding unit is Hz; d is the inner diameter of the receptor, and the corresponding unit is mm; d0 is the standard inner diameter, and the value is 10, and the corresponding unit is mm.

[0011] Optionally, the wall thickness σ of the susceptor further satisfies:

[0012] ;

[0013] Wherein, σ is the wall thickness of the receptor, and the corresponding unit is mm; ρ is the conductivity of the receptor, and the corresponding unit is Ω·cm; μ r is the relative magnetic permeability of the receptor, which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the corresponding unit is Hz; d is the inner diameter of the receptor, and the corresponding unit is mm; d0 is the standard inner diameter, and the value is 10, and the corresponding unit is mm.

[0014] Optionally, the frequency f of the alternating magnetic field satisfies:

[0015] f ≤ 550000;

[0016] Wherein, f is the frequency of the alternating magnetic field generated by the induction coil, and the unit corresponding to the value is Hz.

[0017] Optionally, the frequency f of the alternating magnetic field further satisfies:

[0018] 200000 ≤ f ≤ 450000;

[0019] Wherein, f is the frequency of the alternating magnetic field generated by the induction coil, and the unit corresponding to the value is Hz.

[0020] In order to balance the effect of penetration depth on electromagnetic circumferential heating efficiency, the alternating magnetic field frequency is preferably 250,000 Hz to 420,000 Hz, more preferably 260,000 Hz to 400,000 Hz, and further preferably 275,000 Hz to 370,000 Hz.

[0021] In order to achieve compact size of the device, make the heating element in the device smaller and the device lighter, the alternating magnetic field frequency is preferably 370,000Hz~450,000Hz.

[0022] In order to achieve faster preheating speed of the equipment and enable the equipment to complete preheating more quickly, the frequency of the alternating magnetic field is preferably 200,000Hz~250,000Hz.

[0023] Optionally, the penetration depth δ of the alternating magnetic field into the receptor satisfies:

[0024] δ ≥ 13.5;

[0025] Among them, δ is the penetration depth, and the corresponding unit of the value is μm.

[0026] Optionally, the penetration depth δ of the alternating magnetic field into the susceptor further satisfies:

[0027] δ ≥ 15;

[0028] Among them, δ is the penetration depth, and the corresponding unit of the value is μm.

[0029] Optionally, the sensor is made of ferromagnetic material.

[0030] Optionally, the sensor is coated with a protective layer, and the protective layer includes but is not limited to any one of a ceramic protective layer and a glass protective layer.

[0031] The electromagnetic circumferential heating smoking device disclosed in the present invention has the following technical effects:

[0032] The electromagnetic heating component of the electromagnetic circumferential heating smoking device adopts a circumferential heating mode. The receptor has a cylindrical structure with at least one end open. At least a portion of the cigarette is inserted into the cavity of the cylindrical receptor, and the circumference of the cigarette is heated, which can make the cigarette heated more evenly. Furthermore, by reasonably setting the numerical range of the wall thickness σ of the receptor, the frequency f of the alternating magnetic field, and the penetration depth δ of the alternating magnetic field on the receptor, the effect of the penetration depth on the electromagnetic circumferential heating efficiency can be balanced. The electromagnetic circumferential heating smoking device of the present invention can operate in a lower frequency band, reducing the requirements for the frequency of the alternating magnetic field, which can not only improve the service life of the smoking device, but also reduce the impact of high-frequency electromagnetics on the surroundings, and has excellent smoking effect and higher energy efficiency.

[0033] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0035] Figure 1 A cross-sectional schematic diagram of an electromagnetic circumferential heating smoking device provided by an embodiment of the present invention;

[0036] Figure 2 A three-dimensional schematic diagram of a susceptor of an electromagnetic circumferential heating smoking device provided by an embodiment of the present invention;

[0037] Figure 3 The temperature rise curve of the upper section of the inner wall of the susceptor at different frequencies in the electromagnetic circumferential heating smoking device provided in the embodiment of the present invention;

[0038] Figure 4 The temperature rise curve of the middle section of the inner wall of the susceptor at different frequencies in the electromagnetic circumferential heating smoking device provided in the embodiment of the present invention;

[0039] Figure 5 The temperature rise curves of the lower section of the inner wall of the susceptor at different frequencies in the electromagnetic circumferential heating smoking device provided in the embodiment of the present invention.

[0040] The following are marked in the figure:

[0041] 10. Induction coil; 20. Sensor; 21. Cavity; 30. Cigarette; d. Inner diameter of the sensor; D. Outer diameter of the sensor; σ. Wall thickness of the sensor. DETAILED DESCRIPTION

[0042] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0043] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0044] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0045] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0046] The smoking device can generate a fluctuating electromagnetic field through an induction coil. When the fluctuating electromagnetic field propagates in the receptor, its amplitude continues to decay. In order to measure the attenuation degree of electromagnetic waves in the conductor, the depth at which the field strength amplitude decays to the surface amplitude 1 / e (e is the base of the natural logarithm) is usually called the penetration depth δ. Designers of traditional electromagnetic heating smoking devices usually believe that the ideal heating effect can be achieved by setting the receptor thickness to about 2δ to 3δ. However, this is only applicable to the scenario of central heating smoking devices, because the receptor is fully inserted into the cigarette, and the induction energy can still be completely absorbed by the cigarette; for circumferential heating smoking devices, part of the heat energy of the receptor diffuses inward to heat the cigarette, and the other part is dissipated outward and is not used to heat the cigarette, so the balance between heating efficiency and energy consumption also needs to be considered. The receptor of the present application has a cylindrical structure with at least one end open, and at least a portion of the cigarette is inserted into the cavity of the cylindrical receptor. The circumference of the cigarette is heated, which can make the cigarette heated more evenly. Furthermore, the numerical ranges of the wall thickness σ of the receptor, the frequency f of the alternating magnetic field, and the penetration depth δ of the alternating magnetic field on the receptor are reasonably set. Compared with conventional internal heating electromagnetic heaters that need to increase the frequency to improve performance, the present application can operate in a lower frequency range and reduce the requirements for the frequency of the alternating magnetic field, which can not only increase the service life of the smoking device, but also reduce the impact of high-frequency electromagnetics on the surrounding area.

[0047] The present invention proposes an embodiment of an electromagnetic circumferential heating smoking device. Specifically, Figure 1 and Figure 2As shown, it includes a power supply, a control circuit and an electromagnetic heating component; wherein the power supply is electrically connected to the electromagnetic heating component and the control circuit respectively, and the power supply supplies power to the electromagnetic heating component under the control of the control circuit; the electromagnetic heating component includes a receptor 20 and an induction coil 10, the receptor 20 has a cylindrical structure with at least one end open, the receptor 20 generates heat energy in the alternating magnetic field generated by the induction coil 10 for heating the cigarette 30 placed inside the receptor 20, and the receptor 20 at least surrounds a portion of the cigarette 30 along the axial length.

[0048] Furthermore, when a portion of the sol-generating product is inserted into the smoking device, at least a portion of the cigarette is inserted into the cavity 21 of the cylindrical susceptor 20 and is almost parallel to the direction of the magnetic lines of force of the alternating magnetic field.

[0049] The susceptor 20 is placed inside the induction coil 10 or arranged close to it. When the alternating magnetic field generated by the induction coil 10 penetrates the susceptor 20, eddy currents are generated inside the susceptor 20, which are then converted into heat energy. The cylindrical structure of the susceptor 20 allows a portion of the axial length of the cigarette 30 to be uniformly surrounded. The alternating magnetic field generated by the induction coil 10 forms a closed loop inside the susceptor 20, thereby forming a uniform heating field around the cigarette 30, which can more effectively achieve uniform heating of the cigarette 30, reduce local overheating, and improve the taste and quality of the smoke.

[0050] In the electromagnetic circumferential heating smoking device, the power source can be a rechargeable lithium-ion battery or a disposable battery.

[0051] The control circuit receives the user's operating instructions (such as buttons, touch, etc.) and accurately controls the output of the power supply according to the preset program logic, so as to achieve precise adjustment of the heating power and heating time of the electromagnetic heating component.

[0052] In the embodiment of the present invention, the electromagnetic circumferential heating smoking device further comprises a housing, which is used to accommodate a control circuit, a power supply and an electromagnetic heating component. The housing is made of a high temperature resistant, corrosion resistant and lightweight material, such as stainless steel, aluminum alloy or high-grade plastic, etc., to ensure that the internal control circuit, power supply and electromagnetic heating component can work safely and stably.

[0053] In the embodiment of the present invention, the wall thickness of the susceptor 20 is set to σ, and σ satisfies the following conditions:

[0054] ;

[0055] Wherein, σ is the wall thickness of the receptor 20, and the corresponding unit of the value is mm; ρ is the conductivity of the receptor 20, and the corresponding unit of the value is Ω.cm; μ ris the relative magnetic permeability of the receptor 20, which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the corresponding unit is Hz; d is the inner diameter of the receptor 20, and the corresponding unit is mm; d0 is the standard inner diameter, and the value is 10, and the corresponding unit is mm.

[0056] In the embodiment of the present invention, the wall thickness σ of the susceptor 20 further satisfies:

[0057] ;

[0058] Wherein, σ is the wall thickness of the receptor 20, and the corresponding unit of the value is mm; ρ is the conductivity of the receptor 20, and the corresponding unit of the value is Ω.cm; μ r is the relative magnetic permeability of the receptor 20, which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the corresponding unit is Hz; d is the inner diameter of the receptor 20, and the corresponding unit is mm; d0 is the standard inner diameter, and the value is 10, and the corresponding unit is mm.

[0059] It should be noted that by setting the minimum value of the wall thickness σ, it is ensured that the receptor has sufficient structural strength to withstand the mechanical stress and thermal stress in the working environment. On the other hand, sufficient wall thickness can maintain the good conductivity of the receptor, and appropriate wall thickness can improve the sensitivity of the receptor 20, so that it can sense the change of the magnetic field more accurately. If the wall thickness is too thin, the receptor 20 may be too sensitive and easily interfered by the outside world; if the wall thickness is too thick, the response of the receptor 20 may become sluggish.

[0060] In the embodiment of the present invention, the frequency f of the alternating magnetic field satisfies:

[0061] f ≤ 550000;

[0062] Wherein, f is the frequency of the alternating magnetic field generated by the induction coil 10, and the unit corresponding to the value is Hz.

[0063] It should be noted that the appropriate frequency range helps ensure the stability of the smoking device. Too high a frequency can cause the smoking device to overheat, vibrate, or otherwise become unstable. By limiting the frequency, the reliability and durability of the smoking device can be improved.

[0064] In the embodiment of the present invention, the frequency f of the alternating magnetic field further satisfies:

[0065] 200000 ≤ f ≤ 450000;

[0066] Wherein, f is the frequency of the alternating magnetic field generated by the induction coil 10, and the unit corresponding to the value is Hz.

[0067] It should be noted that the lower limit frequency (200,000 Hz) ensures that the alternating magnetic field has enough energy to excite the current in the induction coil 10 and generate sufficient magnetic field strength to affect the receptor 20. If the frequency is too low, the magnetic field changes too slowly, resulting in an insensitive response of the induction coil 10. The upper limit frequency (450,000 Hz) limits the frequency of the alternating magnetic field to avoid excessive energy consumption, electromagnetic interference, and potential impact on the surrounding environment. At the same time, too high a frequency may also cause heating problems in the induction coil 10 and increase the thermal load of the system. In the frequency range of 200,000 Hz to 450,000 Hz, the induction coil 10 can more effectively capture energy from the alternating magnetic field, which helps to improve the overall efficiency and response speed of the system. The appropriate alternating magnetic field frequency can enhance the sensitivity of the receptor 20 to magnetic field changes while reducing the impact of external electromagnetic fields on system performance.

[0068] The frequency of the alternating magnetic field is preferably 250,000 Hz to 420,000 Hz, more preferably 260,000 Hz to 400,000 Hz, and further preferably 275,000 Hz to 370,000 Hz. In the embodiment of the present invention, the penetration depth δ of the alternating magnetic field on the susceptor 20 satisfies:

[0069] δ ≥ 13.5;

[0070] Among them, δ is the penetration depth, and the corresponding unit of the value is μm.

[0071] In the embodiment of the present invention, the penetration depth δ of the alternating magnetic field on the susceptor 20 further satisfies:

[0072] δ ≥ 15;

[0073] Among them, δ is the penetration depth, and the corresponding unit of the value is μm.

[0074] It should be noted that when the penetration depth δ satisfies δ ≥ 15 μm, it means that the alternating magnetic field can penetrate the material to a depth of at least 15 μm and maintain sufficient magnetic field strength within the depth to produce an effective electromagnetic effect, thereby ensuring that the alternating magnetic field effectively penetrates the susceptor 20 and produces the expected electromagnetic effect.

[0075] In an embodiment of the present invention, the susceptor 20 is made of a ferromagnetic material. The susceptor 20 is made of a material that can convert electromagnetic energy into heat. When located in a fluctuating electromagnetic field, eddy currents induced in the aerosol generating device cause the aerosol generating device to heat up. When the elongated susceptor is positioned in thermal contact with the aerosol-forming substrate, the aerosol-forming substrate is heated by the susceptor 20. The cigarette 30 is designed to engage with an aerosol generating device including an induction heating source. The induction coil 10 generates a fluctuating electric field to heat the susceptor 20 located in the fluctuating electromagnetic field. In use, when the cigarette 30 is inserted into the susceptor 20, the cigarette 30 engages with the aerosol generating device so that the susceptor 20 is located in the fluctuating electromagnetic field generated by the inductor 20. The susceptor 20 can be made of any material that can be heated by induction to a temperature sufficient to generate an aerosol from the aerosol-forming substrate.

[0076] Preferably, the susceptor 20 comprises a metal or carbon, for example, the susceptor comprises a ferromagnetic material, such as ferrite, ferromagnetic steel, or stainless steel. The susceptor 20 may also be aluminum or comprise an aluminum material. Alternatively, the susceptor 20 may be made of 400 series stainless steel, such as 410 grade, 420 grade, or 430 grade stainless steel. Different materials will dissipate different amounts of energy when placed in an electromagnetic field having similar frequency and field strength values. Therefore, the parameters of the susceptor 20, such as material type, length, width, and thickness, may be varied within a known electromagnetic field to provide the desired energy dissipation.

[0077] In the embodiment of the present invention, the susceptor 20 is coated with a protective layer, which includes but is not limited to any one of a ceramic protective layer and a glass protective layer. The susceptor may also include a protective coating formed of glass, ceramic or inert metal.

[0078] On the other hand, the heating energy efficiency experiment based on the embodiment of the present invention is as follows:

[0079] Prepare several heated cigarettes of the same specifications for testing, where the tobacco segment as the matrix segment is 2.5 cm long and 0.54 cm in outer diameter, and is filled with the same weight and type of aerosol matrix. Before the experiment, insert a thermocouple in the middle of the cigarette, and connect the thermocouple to the data acquisition system.

[0080] A stainless steel tube with an inner diameter of 0.56 cm was cut into samples with a length of 2.58 cm. The samples were used as sensors and clamped on the clamping base of the experimental heating device, with a length of 2.5 cm exposed to allow the experimental cigarette to be fully inserted.

[0081] Prepare an electromagnetic induction heating smoking device for the test, based on the commercially available electromagnetic induction heating smoking device SUGU, connect the power supply to a regulated DC power supply, connect an external programmer to the controller to change the frequency of the alternating magnetic field generated by the coil according to the test needs, remove its sensor from the mounting base and install the sensor.

[0082] At room temperature of 25°C, the alternating magnetic field frequency f was set to 275kHZ, 420kHZ, 540kHZ, 790kHZ and 1000kHZ respectively, the data acquisition system was turned on and the experimental heating device was started, and the change of the thermocouple temperature over time was recorded, especially the preheating time from the start of the heating device to the first recording of the target temperature of 260°C by the thermocouple. The test data of each group are shown in Table 1. The temperature rise time of the upper, middle and lower sections of the sensor at different frequencies is respectively referred to Figure 3 , Figure 4 and Figure 5 .

[0083] It can be seen that for electromagnetic circumferential heating smoking devices, the increase in the frequency f of the alternating magnetic field will lead to a decrease in the penetration depth δ caused by the skin effect, so that the heating area is concentrated in the shallow layer of the surface of the receptor, the temperature of the entire receptor is uneven, and when the frequency f of the alternating magnetic field gradually increases, significant electromagnetic leakage will occur. Based on the above factors, when other conditions of the electromagnetic heating component are the same, when the frequency f of the alternating magnetic field is greater than a certain critical value (such as 540kHz), the heating speed not only does not increase, but it is more likely to cause energy spillover loss and other adverse consequences (such as uneven temperature, electromagnetic leakage, etc.), resulting in a longer preheating time. This is because the skin effect under high frequency makes it difficult for heat to penetrate into the interior of the receptor, and electromagnetic leakage also increases energy loss. And it can be seen from Table 1 that when the frequency of the alternating magnetic field is further increased, the difference in preheating time at different frequencies will become larger and larger, bringing more significant adverse effects and thus leading to higher energy consumption and worse smoking experience.

[0084] Table 1: Test results:

[0085]

[0086] Based on the above experimental results, the influence of the penetration depth on the electromagnetic circumferential heating efficiency can be balanced by reasonably setting the numerical range of the wall thickness σ of the susceptor, the frequency f of the alternating magnetic field, and the penetration depth δ of the alternating magnetic field on the susceptor.

[0087] In summary, the present invention discloses an electromagnetic circumferentially heated smoking device with excellent smoking effect and higher energy efficiency. At the same time, compared with the conventional internal heating electromagnetic heater that needs to increase the frequency to improve the efficiency, the product of the present invention can operate in a lower frequency band and reduce the requirements for the frequency of the alternating magnetic field. It can not only improve the service life of the smoking device, but also reduce the impact of high-frequency electromagnetic on the surrounding area.

[0088] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. An electromagnetic circumferential heating smoking device, It is characterized in that The invention comprises a power supply, a control circuit and an electromagnetic heating component; wherein the power supply is electrically connected to the electromagnetic heating component and the control circuit respectively, and the power supply supplies power to the electromagnetic heating component under the control of the control circuit; the electromagnetic heating component comprises a receptor (20) and an induction coil (10); the receptor (20) has a cylindrical structure with at least one end open; the receptor (20) generates heat energy in the alternating magnetic field generated by the induction coil (10) for heating a cigarette (30) placed inside the receptor (20); the receptor (20) surrounds at least a portion of the cigarette (30) along its axial length.

2. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that It also includes a shell, which is used to accommodate the control circuit, the power supply and the electromagnetic heating component.

3. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that The wall thickness of the susceptor (20) is set to σ, and σ satisfies the following conditions: ， Wherein, σ is the wall thickness of the receptor (20), and the corresponding unit of the value is mm; ρ is the conductivity of the receptor (20), and the corresponding unit of the value is Ω.m; μ r is the relative magnetic permeability of the receptor (20), which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the unit corresponding to the value is Hz; d is the inner diameter of the receptor (20), and the unit corresponding to the value is mm; d 0 is the standard inner diameter, the value is 10, and the corresponding unit is mm.

4. The electromagnetic circumferential heating smoking device according to claim 3, It is characterized in that The wall thickness σ of the susceptor (20) further satisfies: ， Wherein, σ is the wall thickness of the receptor (20), and the corresponding unit of the value is mm; ρ is the conductivity of the receptor (20), and the corresponding unit of the value is Ω.cm; μ r is the relative magnetic permeability of the receptor (20), which is a dimensionless parameter; f is the frequency of the alternating magnetic field, and the value corresponds to a unit of Hz; d is the inner diameter of the receptor (20), and the value corresponds to a unit of mm; d 0 is the standard inner diameter, the value is 10, and the corresponding unit is mm.

5. The electromagnetic circumferential heating smoking device according to claim 3 or 4, It is characterized in that The frequency f of the alternating magnetic field satisfies: f≤550000， Wherein, f is the frequency of the alternating magnetic field generated by the induction coil (10), and the unit corresponding to the value is Hz.

6. The electromagnetic circumferential heating smoking device according to claim 3 or 4, It is characterized in that The frequency f of the alternating magnetic field further satisfies: 200000≤f≤230000, 230000≤f≤260000, 260000≤f≤290000, 290000≤f≤340000, 340000≤f≤390000, 390000≤f≤450000, Wherein, f is the frequency of the alternating magnetic field generated by the induction coil (10), and the unit corresponding to the value is Hz.

7. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that The penetration depth δ of the alternating magnetic field on the receptor (20) satisfies: δ ≥ 13.5, Among them, δ is the penetration depth, and the unit corresponding to the value is μm.

8. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that The penetration depth δ of the alternating magnetic field on the receptor (20) further satisfies: δ ≥ 15, Among them, δ is the penetration depth, and the corresponding unit of the value is μm.

9. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that The sensor (20) is made of ferromagnetic material.

10. The electromagnetic circumferential heating smoking device according to claim 1, It is characterized in that The sensor (20) is coated with a protective layer, which includes but is not limited to any one of a ceramic protective layer and a glass protective layer.

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