Electromagnetic atomization electronic cigarette based on planar coil

Abstract

The utility model relates to the field of electronic cigarette atomization, and provides an electromagnetic atomization electronic cigarette based on a planar coil, which comprises a shell, an electromagnetic atomization core, an oil storage bin and the planar coil, and the electromagnetic atomization core, the oil storage bin and the planar coil are all fixedly arranged in the shell and form an air passage communicated with the outside. The planar coil is close to the electromagnetic atomizing core and is parallel to the electromagnetic atomizing core, a magnetic receptor is arranged in the electromagnetic atomizing core, and the distance between the electromagnetic atomizing core and the planar coil is not larger than 20 mm. The planar coil and the magnetic receptor are combined through ingenious structural design, the electronic cigarette with a large-capacity oil cup can be rapidly heated, and due to the fact that the planar coil is small in occupied size, a physical basis is provided for oil cup modeling design and capacity increasing. By designing the electromagnetic heating electronic cigarette which is more flexible and has a larger oil cup, an important contribution is made for promoting the development of an electronic cigarette atomization technology.

Description

Technical Field

[0001] The utility model relates to the field of electronic cigarette atomization, in particular to an electromagnetic atomization electronic cigarette based on a planar coil. Background Art

[0002] Electromagnetic heating technology has the advantages of fast heating speed, high energy conversion rate and local heating. Its application in heat-not-burn solid-state electronic cigarettes is becoming more and more mature. The structure of its heating system is usually a configuration in which a spiral tubular three-dimensional coil surrounds a solid-state cigarette cartridge. Transplanting electromagnetic heating technology to the atomization of liquid e-cigarettes is expected to achieve a more efficient and higher-quality steam atomization experience. However, in addition to completing the atomization effect, e-cigarettes with liquids also need to take into account at least a variety of oil cup shapes to match the varied e-cigarette shapes, a larger oil cup volume to provide a large number of puffs, etc.

[0003] Most of the existing electromagnetic heating technologies operate at frequencies above 1MHz, which is high-frequency oscillation heating. This type of electronic technology usually uses compact spiral tube-shaped three-dimensional coils, which results in a limited internal volume of the smoking device and is not suitable for various shape designs or large-volume oil cups. Therefore, how to design a more flexible and larger oil cup electromagnetic heating device is one of the key challenges in promoting the development of electronic cigarette atomization technology. Utility Model Content

[0004] In order to solve the aforementioned problems of the prior art, the utility model provides an electromagnetic atomization electronic cigarette based on a planar coil, comprising a shell, an electromagnetic atomization core, an oil storage bin and a planar coil, wherein the electromagnetic atomization core, the oil storage bin and the planar coil are all fixedly arranged on the shell and form an airway connected to the outside, and the electromagnetic atomization core comprises: a supporting base, on which an oil outlet hole is provided; oil-conducting cotton, the oil-conducting cotton abuts the oil outlet hole and is abutted and connected with the oil storage bin; a magnetic receptor, the oil-conducting cotton is wound around the magnetic receptor, the interior of the magnetic receptor is hollow and forms a part of the airway; the oil-conducting cotton and the magnetic receptor are both accommodated in the supporting base; wherein the planar coil is close to the electromagnetic atomization core and arranged parallel to it, and the spacing between the magnetic receptor and the planar coil is not greater than 20 mm.

[0005] Furthermore, the upper and lower ends of the support base are open and form a complete airway with the magnetic receptor.

[0006] Furthermore, the magnetic receptor is provided with a plurality of micropores.

[0007] Furthermore, the heating circuit of the planar coil operates at a frequency of 20 KHz to 1 MHz.

[0008] Furthermore, the heating circuit of the planar coil operates using a class D inverter circuit.

[0009] Furthermore, the oil storage tank and the planar coil are arranged on both sides of the electromagnetic atomization core, wherein the planar coil is closer to the electromagnetic atomization core.

[0010] Furthermore, the distance between the magnetic receptor and the planar coil is 5 mm to 20 mm.

[0011] Furthermore, it also includes a yoke sheet arranged on the side of the planar coil.

[0012] Furthermore, the yoke sheets include multiple groups.

[0013] Furthermore, the yoke sheet includes a C-shaped magnetic conductive sheet.

[0014] Compared with the prior art, the beneficial effects of the utility model are: by combining the planar coil with the magnetic receptor through ingenious structural design, the electronic cigarette containing a large-capacity oil cup can be quickly heated. Since the planar coil occupies a small volume, it provides a physical basis for the oil cup shape design and capacity increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a longitudinal cross-sectional diagram of the main components of the electromagnetic atomization electronic cigarette;

[0016] Figure 2 It is a schematic diagram of the transverse section of the main components of the electromagnetic atomization electronic cigarette;

[0017] Figure 3 It is a schematic diagram of the planar coil structure;

[0018] Figure 4 It is a schematic diagram of the magnetic field distribution of a planar coil in a plane perpendicular to the coil plane;

[0019] Figure 5 It is a schematic diagram of the magnetic field distribution of the planar coil parallel to the coil plane at the receptor;

[0020] Figure 6 Schematic diagram of the heating circuit of the planar coil. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference Figure 1 and Figure 2The electromagnetic atomization electronic cigarette includes an electromagnetic atomization core, an oil storage tank 4, a shell 5, a planar coil 6 and a magnetic yoke sheet 7. The electromagnetic atomization core includes a ring-shaped magnetic receptor 1, oil-conducting cotton 2, and a supporting substrate 3. The magnetic receptor 1 and the oil-conducting cotton 2 are both accommodated in the supporting substrate 3. Specifically, the oil-conducting cotton 2 is squeezed and fixed in the tube, and the oil-conducting cotton 2 is wound around the magnetic receptor 1; the supporting substrate 3 is provided with a plurality of oil outlet holes (not shown in the figure), and the oil-conducting cotton 2 abuts against the oil outlet holes and abuts against the inside of the oil storage tank to transport liquid tobacco oil. The annular magnetic receptor 1 is hollow inside and forms a heating airway 12. The peripheral wall of the magnetic receptor 1 is provided with a number of micropores 11 for aerosol diffusion; the oil storage tank 4 and the planar coil 6 are fixedly mounted on the shell 5 for fixing. The shell 5 is hollow inside and is provided with an airway connected to the outside, and has an airway opening 8. The aforementioned heating airway 12 forms a part of the airway. The airflow enters from the airway opening 8 and flows out from the top after being heated by the heating airway 12. The nozzle 9 is fixedly connected to the airway. The oil storage tank 4 and the planar coil 6 are arranged on both sides of the electromagnetic atomization core opposite to each other, wherein the planar coil 6 is closer to the electromagnetic atomization core. The upper and lower ends of the support substrate 3 are open and tubular, and the material thereof can be selected from glass. The hollow and opening parts thereof form a part of the aforementioned airway. The oil-conducting cotton 2 is squeezed and filled by the annular magnetic receptor 1 and the tubular support substrate 3 to guide the oil liquid, and the oil outlet hole on the support substrate 3 corresponds to the opening of the oil storage tank.

[0023] Reference Figure 3 , the planar coil 6 is in the shape of a flat disk and is vertically fixed on the shell 5. The planar coil 6 includes a first terminal 61, a terminal 63 and a winding induction wire 62. In the electromagnetic heating smoking device of this embodiment, the first terminal 61 and the terminal 63 are connected to the PCBA through a lead to form a magnetic oscillation. The planar coil 6 is close to the electromagnetic atomization core and arranged parallel to it, and the distance between the magnetic receptor and the planar coil 6 is not more than 20mm. This is because the magnetic flux density in the near-field distance area is high, so as to maximize the cross-sectional area and length of the magnetic flux penetrating the magnetic receptor. The larger the area and the longer the length of the magnetic lines of force passing through the receptor, the greater the eddy current induced by the interaction of more magnetic lines of force with it, and the more heat is generated. In this embodiment, the preferred distance between the magnetic receptor and the planar coil 6 is 10mm. In some embodiments, the distance can be 5mm, 8mm, or 15mm, depending on the thickness of the shell 5. A thickness greater than 20mm will reduce the magnetic field strength and magnetic induction effect.

[0024] One benefit of using a planar coil is that it can increase the flexibility and volume of the oil cup. As long as the magnetic receptor 1 (heating element) is kept at a small distance from the coil and located in the dense center area of ​​the coil magnetic flux, efficient heating can be achieved. The oil cup is no longer limited by the size and shape of the coil. Its structure is freely extended in the plane parallel to the coil and perpendicular to the Z direction of the coil. It can be configured into various shapes and further expand the volume to increase the oil storage capacity.

[0025] Combination Figure 1 , Figure 2 and Figure 3 For the planar coil 6, its magnetic flux distribution is usually dispersed, and a large part of the energy may be consumed in the air gap. In order to improve the utilization efficiency of electromagnetic induction energy and the uniformity of heating, the present embodiment uses a yoke sheet 7 to reduce the magnetic resistance in the air gap, guide the magnetic field and concentrate the magnetic field, so that its high-density distribution area acts on the magnetic receptor 1 for heating. At the same time, it also plays an electromagnetic field shielding role to prevent the magnetic field from causing unnecessary heating or signal interference to the surrounding parts. The yoke sheet 7 is usually arranged in one or more groups on the outside of the planar coil 6. In this embodiment, the yoke sheet 7 is made into a sheet shape, such as a C-type, which is easy to prepare and install. A group of yoke sheets 7 is configured in the smoking device and placed on opposite sides of the planar coil 6; or multiple groups of yoke sheets are configured, which are evenly distributed to surround the planar coil 6 and the magnetic receptor 1. The main functional materials in the yoke sheet include materials with high magnetic permeability and low loss rate, including, for example, ferrite or soft magnetic alloy.

[0026] This embodiment simulates and analyzes the magnetic field distribution diagram of the planar coil through COMSOL software, and optimizes the configuration through yokes of different shapes and positions. It is found that the use of a C-shaped yoke around the planar coil can concentrate the magnetic field distribution, which is conducive to fully utilizing the energy. Figure 4 The figure shows the magnetic field distribution of a planar coil with a C-shaped yoke. A 15x15mm disc coil is used, and a single copper enameled wire with a diameter of 1mm is used for winding; the yoke sheet is a C-shaped configuration of three 15x15mm magnetic conductive sheets, with a thickness of 1mm and a relative magnetic permeability of 50,000; the magnetic receptor is cylindrical, with a wall thickness of 0.1mm, an outer diameter of 4mm, a height of 12mm, a relative magnetic permeability of 5,000, and a distance of 10mm between the central axis of the magnetic receptor tube and the coil plane; the input condition is 3A current and the operating frequency is 300KHz.

[0027] Figure 5 The magnetic flux distribution along the axis of the magnetic receptor parallel to the coil plane is shown. Figure 4 The distribution in the plane at the dotted line, where the susceptor is shown. The simulation results show that under the guidance of the C-shaped magnetic yoke, there is a higher magnetic flux distribution in the magnetic susceptor, with a maximum of about 0.7mT.

[0028] The operating frequency of the planar coil 6 should not be too high, otherwise, as the frequency increases, the skin effect will increase the effective resistance of the coil, reducing the energy transmission efficiency. In addition, the influence of its parasitic capacitance will be more significant, resulting in a decrease in impedance and possibly causing resonance, affecting the heating effect. Therefore, this embodiment selects the medium frequency range and sets the operating frequency in the range of 20K-1MHz. Figure 6 As shown, a class D parallel resonant inverter includes a parallel resonant circuit, an inverter circuit and a load circuit, wherein the parallel resonant circuit includes a resonant capacitor (C α ) and the resonant inductor (L β ), the inverter circuit includes a power switch tube (S 1 and S 2 ), respectively with the power switch tube (S 1 and S 2 ) parallel gate heating signal (V GS1 and V GS2 ), respectively with the power switch tube (S 1 and S 2 ) parallel diode (V DS1 and V DS2 ) and a DC voltage source (V i ), the load circuit includes a DC blocking capacitor (C cα ) and load (R L The DC voltage source (V i ) is connected to the parallel resonant circuit after being inverted by the inverter circuit to realize the function of inverting DC power into AC power. The power switch tube (S 1 and S 2 ) are connected in series in forward direction, the power switch tube (S 1 and S 2 ) is provided with a DC voltage source (V i ) and the power switch tube (S 1 and S 2 ) in series, in the power switch tube S 2 The inverter output voltage is drawn from both ends, and a resonant capacitor (C α ) and resonant inductance (L β ), the resonant capacitor (C α ) leads to a resonant voltage at both ends, and a DC blocking capacitor (C cα ), in the power switch tube (S 1 and S 2 ) are connected to an anti-parallel diode (V DS1 and V DS2 ) and in the power switch tube (S 1 and S 2) is connected between the gate and emitter of the corresponding gate heating signal (V DS1 and V DS2 ), through the power switch tube (S 1 and S 2 ), gate heating signal (V DS1 and V DS2 ) and diode (V DS1 and V DS2 ), the DC voltage source (V i ) through the parallel resonant circuit to make the output voltage a sine wave, and then connect the load (R L The basic working principle of the circuit is to use the gate heating signal to turn on the two power switch tubes in turn to form two working modes, thereby causing the heating planar coil to produce a state of magnetic effect change.

[0029] Regarding the magnetic receptor 1, thin sheets, hollow tubes or cylindrical shell receptors are used as heating elements based on the following considerations. 1. Improving heating efficiency: Due to the characteristics of medium-frequency heating, there will be a skin effect. These shapes increase the surface area, making the current more concentrated on the surface, improving energy utilization and higher heating efficiency. 2. Uniform heating: These structures can make the induced current more evenly distributed on the surface, thereby obtaining a more uniform temperature field and avoiding local overheating or uneven heating. 3. Providing mechanical support strength: The receptor and the oil-conducting cotton can maintain a relatively stable shape in the support tube. In order to allow the smoke oil to quickly escape or be drawn out of the oil-conducting cotton 2, this embodiment opens a larger number of micropores 11 in the receptor to promote the release of smoke and reduce the risk of condensation due to failure to separate in time.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An electromagnetic atomization electronic cigarette based on a planar coil, comprising a housing, an electromagnetic atomization core, an oil storage tank and a planar coil, wherein the electromagnetic atomization core, the oil storage tank and the planar coil are all fixedly arranged on the housing and form an airway communicating with the outside, characterized in that: The electromagnetic atomizer core comprises: a supporting substrate, an oil outlet hole is provided on the supporting substrate; oil-conducting cotton, the oil-conducting cotton abuts against the oil outlet hole and abuts and communicates with the oil storage bin; a magnetic receptor, the oil-conducting cotton is wound around the magnetic receptor, the interior of the magnetic receptor is hollow and forms a part of the airway; the oil-conducting cotton and the magnetic receptor are both accommodated in the supporting substrate; Wherein, the planar coil is arranged close to the electromagnetic atomization core and in parallel therewith, and the distance between the magnetic receptor and the planar coil is no more than 20 mm.

2. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The upper and lower ends of the support base are open and form a complete airway with the magnetic receptor.

3. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The magnetic receptor is provided with a plurality of micropores.

4. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The heating circuit of the planar coil operates at a frequency of 20 KHz to 1 MHz.

5. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The heating circuit of the planar coil adopts a class D inverter circuit.

6. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The oil storage tank and the planar coil are arranged on both sides of the electromagnetic atomization core, wherein the planar coil is closer to the electromagnetic atomization core.

7. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: The distance between the magnetic receptor and the planar coil is 5 mm to 20 mm.

8. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 1, characterized in that: It also includes a yoke sheet arranged on the side of the planar coil.

9. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 8, characterized in that: The yoke sheets include a plurality of groups.

10. The electromagnetic atomization electronic cigarette based on a planar coil according to claim 9, characterized in that: The yoke sheet includes a magnetic conductive sheet with a C-shaped configuration.

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