A nanofiber membrane rapid heating electronic cigarette heating tube

Abstract

This invention discloses a nanofiber carbon film rapid heating electronic cigarette heating tube, specifically relating to the field of electric heating device technology. It comprises a hollow tube, an electrothermal layer covering the outer wall of the hollow tube and electrically connected to an external circuit board for heating tobacco leaves or cartridges placed inside the hollow tube, an insulating and heat-insulating layer covering the outer wall of the electrothermal layer, an infrared reflective layer covering the insulating and heat-insulating layer, and a fixing layer covering the outer wall of the infrared reflective layer. The hollow tube is used to accommodate tobacco leaves or cartridges, and the electrothermal layer is a nanofiber carbon film. By directly coating the surface of the hollow tube with the electrothermal film, compared to traditional resistance wire heating tubes, the structure is simplified, the manufacturing process is streamlined, and the heating speed is faster, the heating area is larger, and the heating is more uniform. It is a novel electronic cigarette heating tube that provides a better user experience while reducing harm to health.

Description

Technical Field

[0001] This invention relates to the field of electric heating device technology, specifically to a nano-carbon fiber membrane rapid heating electronic cigarette heating tube. Background Technology

[0002] With increasing public awareness of health and the pursuit of a green living environment, global tobacco control has become a clear trend. However, tobacco, as a special commodity, will not disappear from the market in the short term. Therefore, harm reduction in tobacco products has become an inevitable trend in the tobacco industry. Heated tobacco products (HTPs) are the primary solution, using an external heat source to heat tobacco leaves to a temperature just sufficient to release their aroma without actually lighting a cigarette. This method avoids the production of harmful substances such as carbon monoxide and tar that occur during the combustion of traditional cigarettes. Compared to e-cigarettes, it can restore the aroma and taste of traditional tobacco to the greatest extent possible. The heating element is one of the most critical components of heated tobacco products, making it a key technology in the development of next-generation e-cigarettes.

[0003] Currently, the heating temperature of heated electronic cigarettes on the market is generally 300-350℃. Their heating materials use alloy resistance wires or metal sheets, which have the following drawbacks: short lifespan; alloy resistance wires are prone to oxidation at high temperatures, leading to reduced heating efficiency or even burnout; and poor thermal shock resistance, unable to withstand prolonged, repeated, and rapid power-on / off operations. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a nanofiber membrane rapid-heating electronic cigarette heating tube. This tube possesses stable properties, does not oxidize when heated within a temperature range of 350-400℃, and has a long service life. The nanofiber membrane exhibits excellent thermal shock resistance, making it suitable as a heating material for frequently intermittent heating devices. The continuously distributed nanofiber membrane completely covers the surface of the hollow tube, increasing the heating area of ​​the tobacco. The heating method is primarily infrared radiation heating, resulting in more uniform heating and a faster heating speed. Furthermore, the large specific surface area of ​​the nanofiber membrane leads to a large infrared radiation area and high power density, enabling it to reach the required temperature for electronic cigarettes instantly.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a nano-carbon fiber membrane rapid heating electronic cigarette heating tube, a hollow tube for accommodating tobacco leaves or cartridges; an electric heating layer covering the outer wall of the hollow tube and electrically connected to an external circuit board for electrically heating the tobacco leaves or cartridges placed inside the hollow tube; an insulating and heat-insulating layer covering the outer side of the electric heating layer; an infrared reflective layer covering the outer side of the insulating and heat-insulating layer; and a fixing layer covering the outer side of the infrared reflective layer.

[0006] The hollow tube is a quartz tube, an alumina tube, or a magnesium oxide tube.

[0007] The electric heating layer is a carbon nanofiber membrane; when the voltage input to the carbon nanofiber membrane is 5V, the heating temperature of the carbon nanofiber membrane is 350-400℃.

[0008] Metal electrodes are provided at the edges of both ends of the carbon nanofiber membrane.

[0009] The insulating and heat-insulating layer is a ceramic fiber membrane, mica paper, silicon carbide fiber paper, glass fiber paper, or aluminum silicate fiber paper.

[0010] The infrared reflective layer is made of aluminum foil or nickel foil.

[0011] The hollow tube has an inner diameter of 6-15 mm and a wall thickness of 1-3 mm; the insulation and heat insulation layer has a thickness of 0.1-0.2 mm; and the infrared reflective layer has a thickness of 10-50 μm.

[0012] The fixing layer consists of two symmetrical semi-circular glass or ceramic sheets.

[0013] The fixing layer is provided with a fastener for fixing the fixing layer onto the infrared reflective layer.

[0014] Metal electrodes are disposed at the edge of the sidewall of the carbon nanofiber membrane.

[0015] The beneficial effects of this invention, achieved by adopting the above technical solution, are as follows: The hollow tube is used to accommodate tobacco leaves or cartridges. An electric heating layer covers the outer wall of the hollow tube and is electrically connected to an external circuit board for heating the tobacco leaves or cartridges. An insulating layer covers the outside of the electric heating layer. This insulating layer covers the surface of the carbon nanofiber membrane, reducing heat loss through diffusion and enhancing the heating effect of the hollow heating cavity. It also lowers the temperature of the outer packaging, preventing burns. The carbon nanofiber membrane rapid-heating electronic cigarette heating tube also includes an infrared reflective layer, which covers the insulating layer. This infrared reflective layer reflects some infrared radiation back into the hollow heating cavity, enhancing the heating effect. The carbon nanofiber membrane rapid-heating electronic cigarette heating tube also includes a fixing layer, which encapsulates the hollow quartz tube, electric heating layer, insulating layer, and infrared reflective layer into a single unit. The electric heating layer, being a carbon nanofiber membrane, ensures uniform heating of the hollow tube, rapidly raising it to the required heating temperature for the tobacco leaves or cartridges, enhancing the user experience, and providing stable heating. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the cross-sectional structure of the electronic cigarette heating tube for rapid heating of the carbon nanofiber membrane prepared for Example 1;

[0018] Figure 2 A schematic diagram of the three-dimensional structure of the rapid heating electronic cigarette heating tube prepared for Example 1;

[0019] Figure 3 This is a schematic diagram of the structure of the electric heating layer covering the surface of the hollow quartz tube in Implementation Example 1;

[0020] Figure 4 The X-ray photoelectron spectroscopy spectra were obtained by performing heating on the carbon nanofiber membranes in Examples 1 and 2.

[0021] Explanation of reference numerals in the attached drawings: 10, hollow tube; 20, electric heating layer; 30, insulating and heat-insulating layer; 40, infrared reflective layer; 50, fixing layer; 23, wire; 51, fastener. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0024] Example 1:

[0025] This embodiment relates to a nanofiber membrane rapid heating electronic cigarette heating tube, such as... Figure 1-3 As shown, it includes: a hollow tube 10, an electric heating layer 20, an insulating and heat-insulating layer 30, an infrared reflective layer, and a fixing layer 50.

[0026] Specifically, the hollow tube 10 is used to hold tobacco leaves or tobacco cartridges. The electric heating layer 20, covering the outer wall of the hollow tube 10 and electrically connected to an external circuit board, is used to heat the tobacco leaves or tobacco cartridges placed inside the hollow tube 10. An insulating layer 30 covers the outer wall of the electric heating layer 20. The insulating layer 30 reduces heat loss due to outward diffusion, enhances the heating effect of the hollow heating cavity, and lowers the temperature of the outer packaging to prevent burns. An infrared reflective layer covers the insulating layer 30 to reflect some infrared radiation back into the hollow heating cavity, enhancing the heating effect. A fixing layer 50 covers the outer wall of the infrared reflective layer. The hollow tube 10, electric heating layer 20, insulating layer 30, and infrared reflective layer 40 are encapsulated into a single unit.

[0027] Preferably, the hollow tube 10 is a hollow quartz tube, an alumina tube, or a magnesium oxide tube. The electric heating layer 20 is a nanofiber membrane. This ensures uniform heating of the hollow tube 10, rapid temperature rise to the required heating temperature of the tobacco leaf or cartridge, enhances the user experience, and provides stable heating. The insulating and heat-insulating layer 30 is a ceramic fiber membrane, mica paper, silicon carbide fiber paper, glass fiber paper, or aluminosilicate fiber paper. The infrared reflective layer is aluminum foil or nickel foil. In this embodiment, the thickness of the nanofiber membrane is 20-200 μm; the electrical conductivity of the nanofiber membrane is 2000-5000 S / m. When a voltage of 5V is input to the nanofiber membrane, the heating temperature of the nanofiber membrane is 350-400℃. The insulating and heat-insulating layer 30 is mica paper. The thickness of the insulating and heat-insulating layer 30 is 0.1-0.2 mm. The inner diameter of the hollow tube 10 is 6-15 mm, and the wall thickness is 1-3 mm. It offers the advantage of easier and quicker cleaning and maintenance. Since the heating element does not directly contact the tobacco leaves, no cleaning or maintenance of the heating element is required; simply wiping the inner wall of the hollow quartz tube is sufficient. The infrared reflective layer is made of aluminum foil. The thickness of the infrared reflective layer is 10-50 μm.

[0028] It should be noted that the carbon nanofiber membrane is prepared by electrospinning PAN nanofiber membrane, which is then pre-oxidized, carbonized, and graphitized in a graphitization furnace at 2000-2800℃ for 1-3 hours. The following is an explanation with reference to a specific implementation example. In this embodiment, metal electrodes are provided at both ends of the carbon nanofiber membrane, facilitating the connection of an external circuit board or power supply to the metal electrodes via wires 23, thereby inputting electrical energy into the carbon nanofiber membrane to enable rapid heating of the electronic cigarette heating element.

[0029] Preferably, the fixing layer 50 is composed of two symmetrical semi-circular glass or ceramic sheets. The fixing layer 50 is provided with a fastener 51 for fixing the fixing layer 50 onto the infrared reflective layer. In this embodiment, the fastener 51 is a metal clamp or a high-temperature resistant adhesive.

[0030] As one embodiment of the present invention, according to Figure 1 The schematic diagram of the cross-sectional structure shown and Figure 2 The schematic diagram of the three-dimensional structure shown depicts, from the inside out, a hollow tube 10, an electric heating layer 20, an insulating and heat-insulating layer 30, an infrared reflective layer 40, and a fixing layer 50 for assembling the heating tube. A hollow quartz tube with an inner diameter of 8 mm, a wall thickness of 2 mm, and a length of 40 mm is selected as the tobacco container. The nanofiber membrane is graphitized at 2400℃ for 1 hour and then cut into rectangles with an area of ​​32 mm × 40 mm. Both ends are coated with high-temperature resistant conductive adhesive and formed with copper foil to form metal electrodes. The metal electrodes are then connected by copper wires 23. The nanofiber membrane with the connected electrodes is then wrapped and fixed to the outer surface of the hollow quartz tube with high-temperature resistant adhesive. Its structure is as follows. Figure 3 As shown, mica paper and aluminum foil are then wrapped around the hollow quartz tube in sequence. A semi-circular glass sheet with a length of 40mm and a diameter of 11mm is selected and fixed to the surface of the aluminum foil with high-temperature resistant adhesive. This encapsulates the hollow quartz tube, the nano-carbon fiber film, the insulating and heat-insulating layer 30, and the infrared reflective layer 40 into a whole, forming a nano-carbon fiber film rapid heating electronic cigarette heating tube. The control circuit board or power supply applies a 5V DC voltage between the metal electrodes at both ends of the heating tube. The temperature inside the hollow tube 10 is measured with an infrared thermometer. Due to the requirement of rapid heating performance for electronic cigarettes, the test time is set to 3 seconds.

[0031] The nanofiber membrane rapid heating electronic cigarette heating tube prepared in this embodiment can heat up to 395℃ within 3 seconds under a voltage of 5V and a current of 2A and maintain stable heating. After continuous power-on operation for 1000 hours, its resistance is 2.5Ω and there is no significant change. The operating temperature is stable at 390-400℃.

[0032] Implementation Example 2: The main difference between this embodiment and Example 1 is:

[0033] In this invention, the graphitization treatment temperature of the carbon nanofiber membrane is 2000℃ and the time is 2h, and the other conditions are the same as in Example 1.

[0034] The nanofiber membrane rapid heating electronic cigarette heating tube prepared in this embodiment can heat up to 360°C within 3 seconds under a voltage of 5V and a current of 1.6A and maintain stable heating. After continuous power-on operation for 4 hours, its resistance gradually increases to 5Ω and its operating temperature gradually decreases to 290-310°C.

[0035] Implementation Example 3: The main difference between this embodiment and Example 1 is:

[0036] In this invention, the graphitization treatment temperature of the carbon nanofiber membrane is 2800℃ and the time is 2h, and the other conditions are the same as in Example 1.

[0037] The nanofiber membrane rapid heating electronic cigarette heating tube prepared in this embodiment can heat up to 400℃ in 3 seconds under a voltage of 5V and a current of 2.1A and maintain stable heating. After continuous power-on operation for 1000 hours, its resistance is 2.4Ω without significant change, and the operating temperature is stable at 395-400℃.

[0038] Implementation Example 4: The main difference between this embodiment and Example 1 is:

[0039] In this invention, the graphitization treatment temperature is 2400℃ and the time is 2h, and the other conditions are the same as in Example 1.

[0040] The nanofiber membrane rapid heating electronic cigarette heating tube prepared in this embodiment can heat up to 395℃ within 3 seconds under a voltage of 5V and a current of 2A and maintain stable heating. After continuous power-on operation for 1000 hours, its resistance is 2.5Ω without significant change, and the operating temperature is stable at 390-400℃.

[0041] Implementation Example 5:

[0042] In this invention, the graphitization treatment temperature is 2400℃ and the time is 3h, and the other conditions are the same as in Example 1.

[0043] The nanofiber membrane rapid heating electronic cigarette heating tube prepared in this embodiment can heat up to 395℃ within 3 seconds under a voltage of 5V and a current of 2A and maintain stable heating. After continuous power-on operation for 1000 hours, its resistance is 2.5Ω without significant change, and the operating temperature is stable at 390-400℃.

[0044] Comparing examples 1-3, it can be seen that when the graphitization temperature is low, the obtained carbon nanofiber film has poor stability. When electricity is applied and heat is generated, partial oxidation occurs, leading to increased resistance and a decrease in heating temperature. Figure 4 The X-ray photoelectron spectroscopy (XPS) spectra obtained from the carbon nanofiber films after heating in Examples 1 and 2 are shown. The figures show that when the graphitization temperature is 2000℃, the carbon nanofiber film undergoes significant oxidation at 350-400℃, with a marked increase in the number of oxygen-containing groups on the surface. When the graphitization temperature is 2400℃, a carbon nanofiber film with good stability is obtained, exhibiting stable resistance and heating temperature. Further increasing the graphitization temperature still yields a stable carbon nanofiber film, but the changes in resistance and stable heating temperature are not significant. Comparing Examples 1, 4, and 5, it can be seen that the graphitization time has no significant effect on the resistance and stable heating temperature of the carbon nanofiber film.

[0045] In summary, the suitable graphitization treatment temperature for the carbon nanofiber film of the electric heating layer 20 is 2400℃ for 1 hour. Under these conditions, the carbon nanofiber film assembled into a rapid-heating electronic cigarette heating tube operates at 5V DC voltage and can stably heat within a temperature range of 350-400℃. The aroma in the tobacco leaves can evaporate within seconds of being powered on, resulting in a short waiting time and a lifespan of up to 1000 hours, significantly improving the user experience of electronic cigarettes.

[0046] The working principle of this invention is roughly as follows: A nanofiber membrane is used to rapidly heat an electronic cigarette heating element. First, a hollow tube 10 is taken, then a nanofiber membrane is taken and cut to a length equal to the circumference of the hollow tube 10 and a width equal to the length of the hollow tube 10. The cut nanofiber membrane is then fixed to the outer wall of the hollow tube 10 using high-temperature resistant adhesive, ensuring that the nanofiber membrane completely covers the hollow tube 10. This results in uniform heating of the hollow tube 10, guaranteeing uniform heating of the tobacco leaves or cartridges inside the hollow tube 10. Then, metal electrodes are fixed to the edges of both ends of the nanofiber membrane using high-temperature resistant adhesive. The metal electrodes are located at both ends of the hollow tube 10. An external circuit board is also included. Alternatively, the power supply can be connected to the metal electrode via wire 23. Mica paper is then fixed to the outside of the carbon nanofiber membrane using high-temperature resistant adhesive, completely covering the outer surface of the carbon nanofiber membrane. This reduces heat dissipation and enhances the heating effect of the electric heating layer 20 on the tobacco leaves. Next, aluminum foil is cut and fixed to the outside of the mica paper using high-temperature resistant adhesive, completely covering the outer surface of the mica paper. This reduces infrared radiation from the carbon nanofiber membrane and enhances the heating effect of the heating layer on the tobacco leaves. Finally, two semi-circular glass sheets are wrapped around the aluminum foil surface using high-temperature resistant adhesive, encapsulating the hollow quartz tube, electric heating layer 20, insulating layer 30, and infrared reflective layer 40 into a single unit. This invention directly uses the complete carbon nanofiber membrane as the heating element, wrapping it around the outside of the hollow quartz tube, with electrodes connected at both ends, offering the advantage of simple processing and molding.

[0047] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A nanofiber membrane rapid heating electronic cigarette heating tube, characterized in that, include: Hollow tube (10), the hollow tube (10) is used to contain tobacco leaves or tobacco cartridges; An electric heating layer (20) that covers the outer wall of the hollow tube (10) and is electrically connected to an external circuit board for heating the tobacco leaves or tobacco cartridges placed inside the hollow tube (10). An insulating and heat-insulating layer (30) covering the outside of the electric heating layer (20); Infrared reflective layer covering the insulating and heat-insulating layer (30); And, a fixing layer (50) covering the outside of the infrared reflective layer; The fixing layer (50) is composed of two symmetrical semi-circular glass or ceramic sheets; The electrothermal layer (20) is a nanofiber film; When a voltage of 5V is input to the carbon nanofiber membrane, the heating temperature of the carbon nanofiber membrane is 350-400℃; The graphitization treatment of the carbon nanofiber membrane was carried out at a temperature of 2400℃ for 1 hour.

2. The nanofiber membrane rapid heating electronic cigarette heating tube according to claim 1, characterized in that, The hollow tube (10) is a quartz tube, an alumina tube, or a magnesium oxide tube.

3. The nanofiber membrane rapid heating electronic cigarette heating tube according to claim 1, characterized in that, Metal electrodes are provided at the edges of both ends of the carbon nanofiber membrane.

4. The nanofiber membrane rapid heating electronic cigarette heating tube according to claim 1, characterized in that, The insulating and heat-insulating layer (30) is a ceramic fiber membrane, mica paper, silicon carbide fiber paper, glass fiber paper or aluminum silicate fiber paper.

5. The nanofiber membrane rapid heating electronic cigarette heating tube according to claim 1, characterized in that, The infrared reflective layer is made of aluminum foil or nickel foil.

6. The nanofiber membrane rapid heating electronic cigarette heating tube according to claim 1, characterized in that, The hollow tube (10) has an inner diameter of 6-15 mm and a wall thickness of 1-3 mm; The thickness of the insulating and heat-insulating layer (30) is 0.1-0.2 mm; The thickness of the infrared reflective layer is 10-50 μm.

7. The nano-carbon fiber film rapid heating electronic cigarette heating tube according to claim 1, wherein the fixing layer (50) is provided with a fixing member (51) for fixing the fixing layer (50) onto the infrared reflective layer.

Images