A hot air generator based on high frequency resonance structure heat generation

Abstract

The application discloses a hot air machine based on high-frequency resonance structure heating, which comprises a wind tube with a through channel in the inside for containing gas to flow through the inside; a resonance capacitor for constructing a high-frequency resonance structure; and a heating inductor for constructing the high-frequency resonance structure and generating heat to heat the gas; the resonance capacitor and the heating inductor are arranged in the wind tube, and the resonance capacitor and the heating inductor are combined to form the high-frequency resonance structure; the high-frequency resonance structure is connected with the wind tube; the high-frequency resonance structure formed by the combination of the resonance capacitor and the heating inductor is electrically connected with an external high-frequency alternating power source, and the high-frequency resonance structure keeps or substantially keeps in a resonance state during operation. Compared with the prior art, the hot air machine has the advantages of simple structure, high heating efficiency, convenient heating, high hot air efficiency, long service life and good use effect when applied to actual hot air application scenes.

Description

Technical Field

[0001] This invention belongs to the field of hot air devices, and specifically relates to a hot air blower based on the principle of electromagnetic induction heating. Background Technology

[0002] Hot air devices have a wide range of applications in welding, pharmaceuticals, printing, packaging, cleaning, and heat treatment industries. When applied to specific industrial scenarios, they typically use a coiled resistance wire to construct their heating element. After passing direct current or industrial frequency alternating current through the resistance wire, the resistance wire generates heat based on the thermal effect of the current. Air or other designated gases are blown into the heating element, and after the airflow exchanges heat with the heating element, ideal hot air can be obtained. Furthermore, the hot air can be applied to specific industrial processing processes such as hot air welding, hot air melting, and hot air protection.

[0003] Existing hot air devices often employ a specific internal cavity structure, with multiple guide vanes within this cavity to direct gas flow and ensure sufficient gas residence time for adequate contact with the heating element also housed within the cavity. Furthermore, the heating element in these devices typically utilizes a stainless steel tubing with fine tungsten wire coiled within it, and magnesium oxide powder filling the gaps between the wires. During operation, a high-amplitude direct current or a high-current AC power supply is applied to the tungsten wire. Once heated, the heat is conducted through the magnesium oxide powder to the stainless steel tubing, and then further transferred to the air through contact with the outer circumference of the tubing.

[0004] When a hot air device constructed in the above manner is applied to a specific industrial hot air process, it will suffer from serious problems of poor durability and low thermal efficiency. On the one hand, the heating wire, which is made of thin tungsten wire, has poor heat resistance. When a large current amplitude DC or a large current AC at industrial frequency is applied to it, the tungsten wire itself generates heat based on the resistance heating effect of the metal material. After a long period of energization, heat continuously accumulates on the tungsten wire. If the heat conduction is not timely and exceeds the maximum temperature that the tungsten wire can withstand, the thin tungsten wire is easily burned off by the accumulated heat. Once the tungsten wire burns off, the current path will also be broken, and the entire hot air device will be unable to continue working. The lifespan of the device will be significantly shortened, and the thin tungsten wire also has the problem of low heating power density. If a large amount of heat is required, a long tungsten wire must be repeatedly coiled and a large current must be passed through it for a long time. On the other hand, in the actual heating process of the hot air device constructed in the above manner, the heat must first be emitted by the tungsten wire, conducted by magnesium oxide powder, and then sent to the outer periphery of the stainless steel tube. Only the gas entering the inner cavity of the heating device from the external environment can obtain heat through contact with the tube wall of the stainless steel tube. The heat conduction process is complicated and inefficient. These defects will bring great difficulties to the smooth operation of the industrial processing. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a hot air blower based on a high-frequency resonant structure. This hot air blower incorporates a high-frequency resonant structure, cleverly utilizing the unique resonant state of this high-frequency resonant structure to heat the gas, thereby improving the gas heating efficiency and its heating effect.

[0006] Another objective of this invention is to provide a hot air blower that has a simple structure, is convenient for heating, has high thermal efficiency, and a long service life.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A hot air blower based on a high-frequency resonant structure for heating, the hot air blower comprising:

[0009] It has an internal through-channel for the air duct to allow gas to flow through it;

[0010] Resonant capacitors used to construct high-frequency resonant structures;

[0011] And, heating inductors used to construct high-frequency resonant structures and generate heat to heat gases;

[0012] Both the resonant capacitor and the heating inductor are placed in the air duct, and the resonant capacitor and the heating inductor are combined to form a high-frequency resonant structure; this high-frequency resonant structure is connected to the air duct.

[0013] The high-frequency resonant structure formed by the combination of resonant capacitor and heating inductor is electrically connected to an external high-frequency AC power supply. During operation, the high-frequency resonant structure maintains or approximately maintains its resonant state.

[0014] The resonant capacitor exhibits capacitive behavior in the circuit, and its total capacitive reactance is denoted as C. The heating inductor exhibits inductive behavior in the circuit, and its total inductive reactance is denoted as L. Combining the resonant capacitor and the heating inductor to form a high-frequency resonant structure results in a natural resonant frequency, denoted as f0. The magnitude of this natural resonant frequency f0 is related to the total capacitive reactance of the resonant capacitor and the total inductive reactance L of the heating inductor. Let f be the alternating frequency of the external high-frequency AC power supply. Connect the high-frequency resonant structure to the external high-frequency AC power supply and keep it electrically conductive. Let Z be the total impedance exhibited by the high-frequency resonant structure in the circuit. In actual operation, the high-frequency resonant structure maintains or approximately maintains its resonant state. This means that when the high-frequency resonant structure is working, f0 = f or f0 ≈ f. Generally, f0 = f is optimal for the control circuit. At this time, the high-frequency resonant structure exhibits resistive behavior as a whole, and its total impedance Z reaches its extreme value.

[0015] If the two plates of the resonant capacitor are connected to the two ends of the heating inductor respectively, and the two plates of the resonant capacitor are also connected to the two output terminals of the external high-frequency AC power supply, then the resonant capacitor and the heating inductor will form a parallel high-frequency resonant structure. When the parallel high-frequency resonant structure reaches its resonant state, its total impedance Z in the circuit reaches its maximum value. At this time, the voltage at the resonant capacitor and the heating inductor reaches its maximum value, and a high-frequency AC current with the same frequency as the external AC power supply is obtained on the heating inductor.

[0016] If one of the plates of a resonant capacitor is connected to one of the output terminals of an external high-frequency AC power supply, and this plate is also connected to one end of a heating inductor, and the other end of the heating inductor is connected to the other output terminal of the external AC power supply, then the resonant capacitor and the heating inductor will form a series high-frequency resonant structure. When the series high-frequency resonant structure reaches its resonant state, its total impedance Z in the circuit reaches its minimum value. At this time, the current at the resonant capacitor and the heating inductor reaches its maximum value, and a high-frequency AC current with the same frequency as the external AC power supply is obtained on the heating inductor.

[0017] Therefore, it can be seen that by setting up a resonant capacitor and a heating inductor and connecting the two, whether the two are connected to form a parallel high-frequency resonant structure or a parallel high-frequency resonant structure, when the high-frequency resonant structure is maintained or approximately maintained in its resonant state, the heating inductor will obtain AC current with the same frequency as the external high-frequency AC power supply.

[0018] For a heating inductor, when a high-frequency alternating current is applied to it, on the one hand, the skin effect and proximity effect of the alternating current will cause the inductor to exhibit a significant "AC resistance" characteristic. That is, under high-frequency AC conditions, the heating inductor's current impedance in the circuit will be significantly greater than under DC conditions; its AC resistance will be significantly higher than its DC resistance. Thus, according to the circuit equation P=I... 2 As can be seen from R, the heating inductor itself will generate significant heat due to the resistive heating effect. On the other hand, when alternating current is applied to the heating inductor, it will convert the alternating current into an alternating magnetic field. The alternating magnetic field generated by the preceding micro-segment conductor covers the following micro-segment conductor, and the micro-segment conductor covered by the alternating magnetic field will generate heat due to the induced heating effect. The entire heating inductor generates induced heat due to the influence of its own generated alternating magnetic field. In summary, by placing the resonant capacitor and the heating inductor in the air duct, and combining the resonant capacitor and the heating inductor to form a high-frequency resonant structure, and ensuring that this high-frequency resonant structure is maintained or approximately maintained in its resonant state, the heating inductor will receive alternating current with the same frequency as the external high-frequency AC power supply. The heating inductor will generate a large amount of heat due to the resistive heating effect of the AC resistance and the induced heating effect of the alternating magnetic field, which will efficiently heat the gas flowing along the air duct and obtain a large amount of hot air.

[0019] The hot air blower fabricated using the above structure generates heat primarily through the AC resistive heating effect and induced heating effect of the heating inductor under high-frequency AC current. The AC resistive heating effect of the heating inductor under high-frequency AC current is mainly related to the alternating frequency of the AC current; the higher the frequency, the greater the AC resistance exhibited by the heating inductor in the circuit, and the more significant its resistive heating effect. The induced heating effect of the heating inductor under high-frequency AC current is related to factors such as the alternating frequency of the AC current, the magnitude of the current, and the shape and structure of the heating inductor; the higher the alternating frequency and the greater the current, the more significant the induced heating effect of the heating inductor. This heating principle differs from the resistance wire provided in existing technologies, which relies on a large... When a DC current is applied to a resistor, the DC resistance heating effect is completely different. Based on this heating principle, when constructing a hot air blower, the heating inductor no longer needs to use a thin resistance wire to pursue a larger DC resistance value. Instead, it is necessary to select a resonant capacitor with a suitable total capacitive reactance value and a heating inductor with a suitable total inductive reactance value. After the two are combined in a suitable way, a high-frequency resonant structure with a suitable inherent resonant frequency is formed. By adjusting the alternating frequency of the AC power output from the external high-frequency AC power supply, the high-frequency resonant structure can reach its resonant state. A large amount of heat can then be obtained from the heating inductor based on the AC resistance heating effect and the induced heating effect. By controlling the air flow from the blower, ideal hot air can be obtained conveniently and efficiently.

[0020] Furthermore, the resonant capacitor is positioned upwind, and the resonant inductor is positioned downwind. The two plates of the resonant capacitor are electrically connected to an external high-frequency AC power source, and are also electrically connected to the two ends of a heating inductor. When the high-frequency resonant structure formed by the resonant capacitor and heating inductor reaches its resonant state, the resonant capacitor will receive AC current at the same frequency as the external high-frequency AC power source. Since capacitors used in practice inevitably have a loss angle, the resonant capacitor will inevitably heat up due to this AC current. By positioning the resonant capacitor upwind, the unheated cold air flowing into the duct from upwind can carry away some of the heat as it passes through the resonant capacitor, providing a small amount of air cooling.

[0021] By connecting the two plates of the resonant capacitor to the two ends of the heating inductor and keeping them electrically conductive, the resonant capacitor and the heating inductor will form a parallel high-frequency resonant structure. When this high-frequency resonant structure reaches its resonant state, the total impedance Z reaches its minimum value, and the total current obtained at the high-frequency resonant structure will reach its maximum value. At the same time, since the parallel high-frequency resonant structure will have a voltage amplification effect when it reaches its resonant state, the heating inductor will obtain a voltage several times higher than the external high-frequency AC power supply voltage. Therefore, it can be said that after connecting the resonant capacitor and the heating inductor to form a parallel resonant structure, when the parallel resonant structure reaches its resonant state, the heating inductor will obtain a larger current and a larger voltage, which can generate a large amount of heat efficiently with more significant resistance heating effect and induction heating effect, improve gas heating efficiency, and generate a large amount of hot air.

[0022] Furthermore, the resonant capacitor includes at least one capacitor, each capacitor including a capacitor, a first copper foil, and a second copper foil; the first copper foil is in close contact with and connected to one of the plates of the capacitor, and the two are thermally connected; the second copper foil is in close contact with and connected to the other plate of the capacitor, and the two are thermally connected.

[0023] Furthermore, the resonant capacitor also includes a capacitor water-cooling pipe; the capacitor water-cooling pipe has a cooling water flow channel, and the capacitor water-cooling pipe is in close contact with the first copper foil and / or the second copper foil and is thermally connected to it; the capacitor water-cooling pipe is also connected to an external cooling water source to maintain water flow. In specific applications, those skilled in the art can set one or more capacitors according to actual hot air requirements to obtain a resonant capacitor with an ideal total capacitive reactance, and thus change specific parameters such as the overall inherent resonant frequency of the high-frequency resonant structure and the magnitude of the AC current on the heating inductor to obtain the desired gas heating effect. As mentioned above, capacitors used in practice inevitably generate heat due to their inherent loss angle. To prevent the heat generated on the resonant capacitor from accumulating and causing it to deform or burn out, the technical solution provided in this application further includes a first copper foil, a second copper foil, and a capacitor water-cooling pipe. The first and second copper foils are placed in close contact with the two plates of the capacitor, and the capacitor water-cooling pipe is kept in close contact with the first and / or second copper foils. Thus, most of the heat generated by the capacitor during operation will be conducted out through the first and second copper foils and further conducted to the cooling water inside the pipe through the capacitor water-cooling pipe. The circulating cooling water will carry away the heat, preventing heat accumulation at the capacitor and ensuring the long-term stable operation of the hot air blower.

[0024] Furthermore, the heating inductor includes an internal inductor and an external inductor; the internal inductor is located on the side closer to the central axis of the air duct; the external inductor is located on the side farther from the central axis of the air duct; one end of the internal inductor is connected to the first or second copper foil of the resonant capacitor and remains electrically conductive; the other end of the internal inductor is connected to one end of the external inductor and remains electrically conductive, and the other end of the external inductor is connected to the second or first copper foil and remains electrically conductive. By setting up the internal and external inductors and connecting them sequentially, the current-impeding effect exhibited by the heating inductor in the circuit will be the sum of the current-impeding effects of the internal and external inductors. By setting the internal and external inductors separately from the inside out, when the high-frequency resonant structure formed by the heating inductor and resonant capacitor reaches its resonant state, alternating current will be applied equally to both the internal and external inductors. The internal and external inductors will then generate alternating magnetic fields in their respective surrounding spaces. The alternating magnetic field generated by the internal inductor will envelop the external inductor, inducing heating in it; conversely, the alternating magnetic field generated by the external inductor will also envelop the internal inductor, inducing heating in it. Therefore, setting the internal and external inductors separately, arranged from the inside out along the central axis of the duct, will facilitate the induction heating of each other by their respective alternating magnetic fields, further improving the overall heating efficiency of the heating inductors and achieving a better hot air effect.

[0025] Furthermore, both the internal and external inductors are made of conductors with good heat resistance, high resistivity, and a minimum radial thickness not less than the penetration depth under the current AC environment. The internal inductor is spirally wound around the central axis of the duct, and the external inductor is spirally wound around the internal inductor. When AC current is applied to the conductor, due to the skin effect of AC current, the current will concentrate on the surface of the conductor for transmission. By selecting conductors with a minimum radial thickness not less than the penetration depth under the current AC environment, the internal and external inductors are made of conductors with a minimum radial thickness not less than the penetration depth under the current AC environment. If the minimum radial thickness is equal to the penetration depth under the current AC environment, then under the current AC environment, after the AC current output between the two output terminals of the external high-frequency AC power supply enters the internal and external inductors, the entire cross-section of the internal and external inductors will participate in current transmission, and the internal and external inductors will be fully utilized. If the minimum radial thickness of the internal and external inductors is greater than the penetration depth under the current AC power environment, then under the current AC power environment, after the AC power output between the two output terminals of the high-frequency AC power supply enters the internal and external inductors, the surface part of the internal and external inductors participates in current transport, while the current density in the deeper part is sparse and the heat generation is not large. At this time, they will play more of a structural support and heat conduction role, which will improve the structural stability and heat resistance of the internal and external inductors, and ensure that the internal and external inductors can work stably for a long time without melting.

[0026] Furthermore, the hot air blower also includes a magnetic field shield; the magnetic field shield is installed inside the air duct and surrounds the outer inductor; and the magnetic field shield is also connected to the air duct. During operation, the inner and outer inductors generate an alternating magnetic field, which is distributed in the surrounding space according to its own structure and shape. If this alternating magnetic field is not constrained, it will induce heating in the air duct and even other metal conductor structures outside the air duct, affecting the structural safety and stability of other components. Therefore, the technical solution provided in this application also includes a magnetic field shield, which effectively constrains the alternating magnetic field generated at the heating inductor, preventing it from diffusing into the external space of the shield and strictly confining it within the space inside the shield.

[0027] Furthermore, the hot air blower also includes a temperature coupler; the sensing end of the temperature coupler is located downwind in the air duct, and the temperature coupler also interacts with an external controller. The temperature coupler is used to measure the temperature of the gas heated by the hot air blower, allowing operators to monitor the hot air effect in real time and adjust the operation accordingly.

[0028] Furthermore, the hot air blower also includes an end cap; the end cap is located at the end of the air duct near the upwind side; the end cap is detachably connected to the air duct; and the end cap has at least one air inlet for gas to enter. By connecting an external air source through the air inlet and properly controlling the on / off state of the external air source, the gas flow rate and gas velocity can be easily controlled. In conjunction with the resonant capacitor and heating inductor, hot gas with ideal volume and velocity can be obtained at the downwind position of the air duct.

[0029] Furthermore, the end cap also has a water cooling pipe through hole for the capacitor to pass through and connect to an external cooling water source, as well as a wiring through hole for the capacitor to pass through and connect the resonant capacitor to an external high-frequency AC power supply.

[0030] The advantages of this invention are: compared with the prior art, the hot air blower provided in this application has a simple structure, high heating efficiency, convenient heating, high hot air efficiency, and long service life. When applied to actual hot air application scenarios, it can achieve good results. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of a hot air blower based on a high-frequency resonant structure provided in a specific implementation.

[0032] Figure 2 This is a first cross-sectional view of a hot air blower based on a high-frequency resonant structure provided in a specific implementation.

[0033] Figure 3 This is a second cross-sectional view of a hot air blower based on a high-frequency resonant structure provided in a specific implementation.

[0034] Figure 4 This is a bottom view of a hot air blower based on a high-frequency resonant structure provided in a specific implementation.

[0035] Figure 5 This is a partial structural schematic diagram of a hot air blower based on high-frequency resonant structure heating provided in a specific implementation embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] To achieve the above objectives, the technical solution of the present invention is as follows:

[0038] Please see Figure 1-5 .

[0039] This specific embodiment provides a hot air blower based on a high-frequency resonant structure for heating, the hot air blower comprising:

[0040] The ventilation duct 1 has a through channel inside for the flow of gas.

[0041] Resonant capacitor 2 is used to construct the high-frequency resonant structure;

[0042] And, a heating inductor 3 used to construct a high-frequency resonant structure and generate heat to heat the gas;

[0043] Both the resonant capacitor 2 and the heating inductor 3 are disposed in the air duct 1, and the resonant capacitor 2 and the heating inductor 3 are combined to form a high-frequency resonant structure; this high-frequency resonant structure is connected to the air duct 1.

[0044] The high-frequency resonant structure formed by the combination of resonant capacitor 2 and heating inductor 3 is electrically connected to the external high-frequency AC power supply E. During operation, the high-frequency resonant structure maintains or approximately maintains its resonant state.

[0045] Furthermore, the resonant capacitor 2 is positioned upwind, and the resonant inductor 3 is positioned downwind. The two plates of the resonant capacitor 2 are electrically connected to the external high-frequency AC power supply E, and the two plates of the resonant capacitor 2 are also electrically connected to the two ends of the heating inductor 3.

[0046] Furthermore, the resonant capacitor 2 includes at least one capacitor, each of which includes a capacitor 211, a first copper foil 212, and a second copper foil 213; the first copper foil 212 is in close contact with and connected to one of the plates of the capacitor 211, and the two are kept thermally connected; the second copper foil 213 is in close contact with and connected to the other plate of the capacitor 211, and the two are kept thermally connected.

[0047] Furthermore, the resonant capacitor also includes a capacitor water cooling pipe 22; the capacitor water cooling pipe 22 has a cooling water flow channel, the capacitor water cooling pipe 22 is in close contact with the first copper sheet 212 and / or the second copper sheet 213 and is thermally connected to them; the capacitor water cooling pipe 22 is also connected to an external cooling water source to maintain water flow.

[0048] Furthermore, the heating inductor 3 includes an inner inductor 31 and an outer inductor 32; the inner inductor 31 is located on the side close to the central axis of the air duct 1; the outer inductor 32 is located on the side away from the central axis of the air duct 1; one end of the inner inductor 31 is connected to the first copper foil 212 or the second copper foil 213 of the resonant capacitor 2 and remains electrically conductive; the other end of the inner inductor 31 is connected to one end of the outer inductor 32 and remains electrically conductive, and the other end of the outer inductor 32 is connected to the second copper foil 213 or the first copper foil 212 and remains electrically conductive.

[0049] Furthermore, both the inner inductor 31 and the outer inductor 32 are made of conductive material with good heat resistance, high resistivity, and a minimum radial thickness not less than the penetration depth under the current AC power environment; the inner inductor 31 is spirally wound around the central axis of the air duct 1; the outer inductor 32 is spirally wound around the inner inductor 31.

[0050] Furthermore, the hot air blower also includes a magnetic field shield 4; the magnetic field shield 4 is installed inside the air duct 1 and is fitted over the outer inductor 32; and the magnetic field shield 4 is also connected to the air duct 1.

[0051] Furthermore, the hot air blower also includes a temperature measuring coupler 5; the detection end of the temperature measuring coupler 5 is set at the downwind position in the air duct 1, and the temperature measuring coupler 5 also interacts with an external controller.

[0052] Furthermore, the hot air blower also includes an end cover 6; the end cover 6 is located at the end of the air duct 1 near the upwind side; the end cover 6 is detachably connected to the air duct 1; and the end cover 6 has at least one air inlet 61 for gas to enter.

[0053] Furthermore, the end cover 6 is also provided with a water cooling pipe through hole 62 for the capacitor to pass through and connect to an external cooling water source, and a wiring through hole 63 for the capacitor to pass through and connect the resonant capacitor to an external high-frequency AC power supply.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A hot air blower based on a high-frequency resonant structure for heating, characterized in that, The hot air blower includes: It has an internal through-channel for the air duct to allow gas to flow through it; Resonant capacitors used to construct high-frequency resonant structures; And, heating inductors used to construct high-frequency resonant structures and generate heat to heat gases; Both the resonant capacitor and the heating inductor are disposed in the air duct, and the resonant capacitor and the heating inductor are combined to form a high-frequency resonant structure; the high-frequency resonant structure is connected to the air duct. The resonant capacitor is located upwind, and the heating inductor is located downwind. The two plates of the resonant capacitor are electrically connected to an external high-frequency AC power supply. The two plates of the resonant capacitor are also connected to the two ends of the heating inductor and remain electrically connected. The resonant capacitor includes at least one capacitor, and each capacitor includes a capacitor, a first copper foil, and a second copper foil; the first copper foil is in close contact with and connected to one of the plates of the capacitor, and the two are thermally connected; the second copper foil is in close contact with and connected to the other plate of the capacitor, and the two are thermally connected.

2. The hot air blower based on high-frequency resonant structure heating as described in claim 1, characterized in that, The resonant capacitor also includes a capacitor water-cooling tube; the capacitor water-cooling tube has a cooling water flow channel, the capacitor water-cooling tube is in close contact with the first copper sheet and / or the second copper sheet and is thermally connected to it; the capacitor water-cooling tube is also connected to an external cooling water source to maintain water flow.

3. The hot air blower based on high-frequency resonant structure heating as described in claim 2, characterized in that, The heating inductor includes an internal inductor and an external inductor; the internal inductor is located on the side close to the central axis of the air duct; the external inductor is located on the side away from the central axis of the air duct; one end of the internal inductor is connected to the first or second copper foil of the resonant capacitor and remains electrically conductive; the other end of the internal inductor is connected to one end of the external inductor and remains electrically conductive, and the other end of the external inductor is connected to the second or first copper foil and remains electrically conductive.

4. The hot air blower based on high-frequency resonant structure heating as described in claim 3, characterized in that, Both the inner inductor and the outer inductor are made of conductive material with good heat resistance, high resistivity, and a minimum radial thickness not less than the penetration depth under the current AC environment; the inner inductor is spirally wound around the central axis of the air duct; the outer inductor is spirally wound around the inner inductor.

5. The hot air blower based on high-frequency resonant structure heating as described in claim 4, characterized in that, The hot air blower also includes a magnetic field shield; the magnetic field shield is disposed inside the air duct and is fitted over the outer inductor; and the magnetic field shield is also connected to the air duct.

6. The hot air blower based on high-frequency resonant structure heating as described in claim 4, characterized in that, The hot air blower also includes a temperature measuring coupler; the detection end of the temperature measuring coupler is located at a downwind position in the air duct, and the temperature measuring coupler also interacts with an external controller.

7. The hot air blower based on high-frequency resonant structure heating as described in claim 4, characterized in that, The hot air blower also includes an end cap; the end cap is located at the end of the air duct near the upwind side; the end cap is detachably connected to the air duct; and the end cap has at least one air inlet for gas to enter.

8. The hot air blower based on high-frequency resonant structure heating as described in claim 7, characterized in that, The end cap is also provided with a water cooling pipe through hole for the capacitor water cooling pipe to pass through and connect with an external cooling water source, and a wiring through hole for the wire to pass through and connect the resonant capacitor with an external high-frequency AC power supply.

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