Novel efficient dual-work electromagnetic induction heating module and preparation method

Abstract

The invention discloses a novel efficient dual-work electromagnetic induction heating module, a heating cavity is of a hollow tubular structure, and the interior of the heating cavity is a heating cavity used for placing a heated body; the heating cavity comprises a heating section, and the heating section is located in the middle section of the heating cavity and used for containing an induction coil. And the induction coil is a spiral coil, is fixed in the heating section and is embedded into the annular inner wall of the heating cavity. The induction coil is configured to circulate alternating current changing at a high speed, and then an alternating magnetic field is generated in the heating cavity, so that eddy current is generated on the metal inductor to achieve heating, and tobacco or tobacco tar in the heated body is rapidly heated and atomized. A common high-temperature-resistant molecular material can be used as a heating cavity material, so that the cost of the whole material is reduced. The induction coil is manufactured by adopting a spiral winding mode, so that the cost and the process complexity are greatly reduced. The induction coil is directly arranged in the cavity in an in-mold injection molding mode, no subsequent processing step is needed, and the structure is more reliable.

Description

Technical Field

[0001] The present invention belongs to the field of electronic cigarettes, and in particular relates to a novel high-efficiency dual-function electromagnetic induction heating module and a preparation method thereof. Background Art

[0002] As people become more aware of the harmfulness of traditional cigarettes, calls for tobacco control are growing louder. In addition, with the rapid development of electronic technology in recent years, electronic cigarettes have come into being. The core component of electronic cigarettes is the oil heating atomizer. The development of existing electronic cigarettes on the market can be roughly divided into two generations. Most of them use nickel-chromium electric heating alloy heating wires or tungsten alloy heating wires to heat the smoke liquid or smoke paste.

[0003] The general structure of an electronic cigarette consists of an airflow detector, a control circuit, an atomizer, an LED signal light, a lithium battery, etc., but the principle is basically the same. When smoking, the control chip monitors the airflow and controls the current to heat the nickel-chromium wire atomizer to make the smoke oil or smoke paste emit simulated smoke. When not smoking, there is no airflow and the control chip enters standby mode.

[0004] Its working principle is that when current flows through the nickel-chromium resistance wire of the atomizer, the resistance wire generates heat and conducts it to the smoke oil, causing the smoke oil to heat up and atomize. This method is widely used. The atomizer heating wire is located at the bottom of the entire heater. The heating wire rolled into the heating wire is located on the axis of the smoke bomb or the smoke core and is in a vertical state. There is a problem of low heating efficiency, which easily leads to the disadvantages of small heating area of ​​the smoke core, poor heating effect, uneven heating, etc.

[0005] There are also electronic cigarette products that use microwave heating on the market. One structure is to wrap the FPC coil on the cavity and then wrap several layers of flexible nanocrystalline materials as magnetic shielding materials. When the microwave heater of this structure is wrapped with nanocrystals, the wrapping process of the nanocrystals (tightness, tolerance of the number of turns) has a great influence on the inductance value of the product. Thus affecting the stability of the product. In addition, the wrapped nanocrystals will expand and loosen under long-term use in a high-temperature environment, which will also affect the stability of the coil inductance value and service life. Summary of the invention

[0006] The technical purpose of the present invention is to provide a new type of high-efficiency dual-function electromagnetic induction heating module and a preparation method to solve the problems of low stability and short service life.

[0007] To solve the above problems, the technical solution of the present invention is: A new type of high-efficiency dual-function electromagnetic induction microwave heating module, comprising: a heating cavity and an induction coil; The heating cavity is a hollow tubular structure, the interior of the heating cavity is a heating cavity, which is used to place the heated object; the heating cavity includes a heating section, which is located in the middle section of the heating cavity and is used to place the induction coil; The induction coil is a spiral coil, fixed in the heating section, and embedded in the annular inner wall of the heating cavity; The induction coil is configured to flow a high-speed changing alternating current, thereby generating an alternating magnetic field in the heating chamber to generate eddy currents on the metal induction body to achieve heating, and quickly heat and atomize the tobacco or e-liquid in the heated body.

[0008] Among them, the heating cavity is made of high-temperature resistant food-grade polymer material.

[0009] Specifically, the shape of the heating cavity includes a circular tube, an elliptical tube and a square tube.

[0010] 4. The new high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that the operating temperature of the induction coil is 200 to 1000°C, the operating voltage is 2.0 to 5.0V, the operating frequency is 50KHz to 3.0GHz, and the energy generated is 1 to 25W.

[0011] The induction coil is made of copper, silver, nickel or alloy material.

[0012] Specifically, the inductance value Ls of the induction coil is 102.2 nH, and the AC resistance Rs is 42.6 mΩ.

[0013] A method for preparing a novel high-efficiency dual-function electromagnetic induction heating module, comprising the following steps: The relevant setting parameters of the induction coil are obtained through simulation design optimization, including the inductance value Ls of 102.2nH and the AC resistance Rs of 42.6 mΩ; A double-strand right-hand unidirectional spiral winding method or a double-strand bidirectional cross spiral winding method is used to perform winding and debugging based on the simulated induction coil to obtain an actual induction coil; The induction coil is embedded in the heating cavity by in-mold injection molding to achieve one-piece molding.

[0014] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The heating cavity material of the present invention can use common high temperature resistant molecular materials, thus reducing the overall material cost.

[0015] The induction coil is manufactured by spiral winding, which greatly reduces the cost and process complexity.

[0016] The induction coil is placed directly in the cavity by in-mold injection molding. There is no subsequent processing step, the structure is more reliable, and there is no need for complicated processes such as wrapping nanocrystals. There is no problem of loosening after long-term use, and there is no risk of aging of LDS coil after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0018] Figure 1 This is a disassembled diagram of a novel electromagnetic induction microwave heating module of the present invention; Figure 2 This is a disassembled diagram of a novel electromagnetic induction microwave heating module of the present invention.

[0019] Description of Reference Numerals 1: Heating cavity; 2: Induction coil. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0021] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0022] The following is a further detailed description of a novel electromagnetic induction microwave heating module and a preparation method proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0023] Example See also Figure 1 and Figure 2 A novel electromagnetic induction microwave heating module uses an induction coil 2 to heat instead of the traditional nickel-chromium resistance wire heating method. The structure includes: a heating cavity 1 and an induction coil 2.

[0024] Among them, the heating cavity 1 is a hollow tubular structure, and the interior of the heating cavity 1 is a heating cavity for placing the heated object. The heating cavity 1 is made of high-temperature resistant food-grade polymer material, preferably PEEK material. The long-term use temperature of the polymer material can reach above 260°C. The advantages of using polymer materials are: easy molding and manufacturing. Plastic materials have the advantage of strong magnetic permeability. Plastic materials have the advantage of low thermal conductivity, that is, the heating temperature inside the core is not easy to diffuse and lose outward. Its shape includes any shape such as circular tubular, elliptical tubular and square tubular. The heating cavity 1 is divided into multiple sections, the middle section of which is the heating section, which is used to fix the induction coil 2.

[0025] Among them, the induction coil 2 of this embodiment is a spiral coil, which is fixed in the heating section and embedded in the annular inner wall of the heating cavity 1. The induction coil 2 can be made of copper, silver, nickel single material or alloy material of the above metals. The induction coil 2 is a wound spiral coil and is placed on the inner wall of the heating section by in-mold injection molding. The cross-section of the coil can be circular, square and other shapes. The cross-sectional size of the coil, the winding shape, the spacing, etc. are determined according to the power requirements. The cross-sectional size of the coil mainly considers whether the coil can meet the power requirements of the system. If it is too thin, it is easy to melt during operation, and if it is too thick, it takes up too much space. The shape of the winding is mainly determined to meet the requirement of uniform heating of the heated object. If the cigarette is cylindrical, the shape of the coil also needs to be cylindrical to meet the requirement of uniform heating of the cigarette. The coil spacing is also to meet the uniform heating requirements of the cylinder. If it is too sparse, the heated body is prone to uneven heating. The required power refers to the system meeting the power requirements. How many joules of heat are needed to ignite the heated object, where is the coil current, is the coil resistance. The specific parameters are as follows: the operating temperature of the induction coil 2 is 200 to 400°C, the operating voltage is 2.0 to 5.0V, the operating frequency is 50KHz to 3.0GHz (50KHz, 100KHz, 6.78MHz, 13.56MHz, 2.4GHz, 3.0GHz), the microwave energy is 1 to 25W, the coil inductance Ls: 102nH+ / -2%, the coil AC resistance Rs: less than 50mΩ, the diameter of the induction coil 2 is 7.5mm (adjustable according to the power and product design), and the spiral coil height is 8.0mm (adjustable according to the power and product design). The coil can be wound in a double-strand right-handed unidirectional spiral winding or a double-strand bidirectional cross spiral winding.

[0026] The working principle of this embodiment is now explained: using the principle of electromagnetic induction heating, by supplying power to the induction coil 2, when the frequency of the induction coil 2 reaches the electromagnetic wave in the frequency band of 50KHz~3.0GHz, the electromagnetic wave is formed in the heating cavity 1, and the high-speed changing alternating current will generate a changing alternating magnetic field through the induction coil 2. The coil generates eddy currents on the metal induction body inside the coil by cutting the alternating magnetic lines of force, and generates heat energy through the high-speed movement of carriers. Under the action of the microwave electromagnetic field, the microwave energy is quickly converted into heat in the material, and the object is heated by the heat energy, so that the temperature of the material rises rapidly, and the smoke oil in the atomizer is heated and atomized into smoke droplets with a diameter of about 0.5-1.5 um. Since the coil is arranged on the inner wall of the entire heating cavity 1, it has the advantages of fast heat conversion efficiency and uniform heating.

[0027] Furthermore, the present embodiment also provides a novel method for preparing an electromagnetic induction microwave heating module, comprising the following steps: According to the coil inductance calculation formula, the inductance Ls of the coil is proportional to the length of the coil and the number of turns N, and is inversely proportional to the cross-sectional area S of the coil and the gap G of the coil. Combined with the coil inductance calculation formula, the relevant setting parameters of the induction coil 2 are obtained by design optimization using HFSS simulation software, that is, the inductance value Ls and the AC resistance value Rs can be adjusted according to the actual application. The inductance value Ls of the optimized induction coil 2 is 102.2nH, and the AC resistance value Rs is 42.6 mΩ, and finally the test inductance value Ls of the actual coil is 104nH, and the AC resistance value Rs is 46 mΩ. The design optimization is based on the following formula: From the above two formulas, we can get: B= / Eddy current loss power of coil: This part of eddy current power and power Heat the heating element together.

[0028] in, is the cylindrical radius of the induction coil 2; is the resistivity of the induction coil 2; is the alternating field frequency; is the magnetic flux density in the induction coil 2; is the inductor; is the number of coil turns; is the effective length of the magnetic ring (coil); is the effective cross-sectional area of ​​the magnetic ring (coil).

[0029] Then, a double-strand right-hand unidirectional spiral winding method or a double-strand bidirectional cross spiral winding method is used to perform winding and debugging based on the simulated induction coil 2 to obtain the actual induction coil 2. Finally, the induction coil 2 is embedded in the heating cavity 1 by in-mold injection molding to achieve integrated molding.

[0030] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A new type of high-efficiency dual-power electromagnetic induction microwave heating module, characterized in that: include: Heating chamber and induction coil; The heating cavity is a hollow tubular structure, the interior of the heating cavity is a heating cavity, which is used to place the heated object; the heating cavity includes a heating section, which is located in the middle section of the heating cavity and is used to place the induction coil; The induction coil is a spiral coil, fixed in the heating section, and embedded in the annular inner wall of the heating cavity; The induction coil is configured to flow a high-speed changing alternating current, thereby generating an alternating magnetic field in the heating chamber to generate eddy currents on the metal induction body to achieve heating, and quickly heat and atomize the tobacco or tobacco oil in the heated body.

2. The novel high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that: The heating cavity is made of high temperature resistant food grade polymer material.

3. The novel high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that: The shape of the heating cavity includes a circular tube, an elliptical tube and a square tube.

4. The novel high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that: The induction coil has an operating temperature of 200 to 1000° C., an operating voltage of 2.0 to 5.0 V, an operating frequency of 50 KHz to 3.0 GHz, and generates energy of 1 to 25 W.

5. The novel high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that: The induction coil is made of copper, silver, nickel or alloy material.

6. The novel high-efficiency dual-function electromagnetic induction heating module according to claim 1 is characterized in that: The inductance value Ls of the induction coil is 102.2nH, and the AC resistance Rs is 42.6mΩ.

7. A method for preparing a novel high-efficiency dual-function electromagnetic induction heating module, comprising preparing the novel high-efficiency dual-function electromagnetic induction heating module as claimed in claim 6, characterized in that: The steps include: The relevant setting parameters of the induction coil are obtained through simulation design optimization, including the inductance value Ls of 102.2nH and the AC resistance Rs of 42.6 mΩ; A double-strand right-hand unidirectional spiral winding method or a double-strand bidirectional cross spiral winding method is used to perform winding and debugging based on the simulated induction coil to obtain an actual induction coil; The induction coil is embedded in the heating cavity by in-mold injection molding to achieve one-piece molding.

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