Ceramic heating tube of electronic smoking set and manufacturing method of ceramic heating tube

Abstract

The invention discloses a ceramic heating tube of an electronic smoking set and a manufacturing method of the ceramic heating tube, the ceramic heating tube comprises a tube wall, a tube cavity and an electrode lead, the tube wall comprises an enamel layer, a ceramic inner layer, a heating resistor and a ceramic outer layer which are connected into a whole from inside to outside in the radial direction, and the heating resistor comprises a heating resistor wire and an electrode disc; the heating resistance wire and the electrode disc are both formed by sintering after resistance paste is printed on the outer surface of the ceramic inner layer green body or the inner surface of the ceramic outer layer green body, at least two rows of heat insulation through holes are formed in the pipe wall in the longitudinal direction, each row of heat insulation through holes comprises a plurality of heat insulation through holes, and the heat insulation through holes divide the pipe wall into at least two heat conduction areas. And at least one group of heating resistors are respectively arranged between the ceramic inner layer and the ceramic outer layer where each heat conduction area is located. The electronic cigarette has the beneficial effects that the heat-insulating through holes are formed to distinguish different heat-conducting areas, so that the temperature of smoke which begins to be sucked out can be reduced, and the smoke is prevented from scalding the mouth; in addition, the heating resistor is well protected, so that the heating resistor is not easy to damage and works stably.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic smoking devices, and more particularly, to a ceramic heating tube of an electronic smoking device and a manufacturing method thereof. Background Art

[0002] Electronic smoking devices, including heat-not-burn (HNB) devices, are used to heat and bake cigarettes to produce aerosol or smoke for inhalation. These devices typically consist of a housing, a power supply, and a heating element. The power supply contains a battery that powers the heating element, which, when powered, heats and bakes an aerosol-generating substrate or the tobacco portion of the cigarette to produce aerosol or smoke. Cigarettes typically consist of a mouthpiece and a bakeable portion, the latter typically composed of an aerosol-generating substrate or smoke-generating tobacco material.

[0003] Existing heating components in electronic cigarette devices primarily utilize resistance wire heating and electromagnetic induction coil heating. Both heating methods require a heating tube or heat pipe to heat the exterior of the cigarette, or a heating needle, heat conducting needle, or heating plate or heat conducting sheet to heat the interior. When using external heating, the heat pipe is primarily constructed of metal to facilitate rapid heat conduction. When a user turns on a typical electronic cigarette device, they must first connect the heating element to fully preheat the cigarette before inhaling. Existing metal heat pipes typically heat the entire outer surface of the heat pipe using a heating wire. Due to the large surface area of ​​the heat pipe, the heating wire consumes a significant amount of power to raise the temperature. Consequently, existing electronic cigarette devices require a significant amount of power during preheating, and the entire inner surface of the heat pipe heats up slowly. This makes it difficult for users to inhale smoke at the beginning of a puff, and the air they inhale is still relatively hot, easily burning their mouths and resulting in a poor user experience.

[0004] Existing metal heat pipes typically heat the entire outer wall of the heat pipe by energizing a heating wire mounted on its outer wall. Because the metal heat pipe conducts heat quickly where it contacts the heating wire, it can quickly heat the cigarette locally, potentially causing overheating and scorching of the cigarette's outer wall, resulting in a burnt smell in the smoke. Furthermore, after prolonged high-temperature operation, the heating wire can easily deform, causing it to loosen from the outer wall of the heat pipe, preventing it from maintaining close contact with the outer wall. This reduces heat transfer efficiency and results in a poor user experience. Summary of the Invention

[0005] The present invention provides a ceramic heating tube for an electronic smoking device in order to overcome the above technical deficiencies.

[0006] The technical solution of the present invention is achieved as follows: a ceramic heating tube for an electronic cigarette device, comprising a tube wall, a tube cavity and an electrode lead, wherein the tube cavity is used to insert and accommodate a cigarette, the tube wall comprises a glaze layer, a ceramic inner layer, a heating resistor and a ceramic outer layer which are connected as one piece from the inside to the outside in a radial direction, the heating resistor comprises a heating resistor wire and an electrode disk connected to both ends of the heating resistor wire, the heating resistor wire and the electrode disk are both made by printing a resistance slurry on the outer surface of the ceramic inner layer green body or the inner surface of the ceramic outer layer green body and then sintering, the tube wall is provided with at least two rows of thermal insulation through holes in the longitudinal direction, and each row of thermal insulation through holes is provided with a plurality of holes. The hole includes a plurality of heat-insulating through holes, which divide the tube wall into at least two heat-conducting areas in the circumferential direction. At least one group of heating resistors is respectively provided between the ceramic inner layer and the ceramic outer layer where each heat-conducting area is located. The ceramic outer layer is provided with an electrode through hole at the electrode disk. One end of the electrode lead is welded to the electrode disk through the electrode through hole. Each group of heating resistors is used to generate heat and conduct heat to the ceramic inner layer and the enamel layer after being energized simultaneously or individually. The ceramic inner layer and the enamel layer further conduct heat to the outer wall of the cigarette to bake it to produce smoke that can be inhaled into the mouth.

[0007] Preferably, each group of the heating resistance wires is formed by a circuitous route on the outer surface of the ceramic inner layer or a partial surface of the inner surface of the ceramic outer layer.

[0008] Preferably, each group of heating resistance wires consists of two resistance wires with the same endpoints and parallel routes.

[0009] Preferably, the ceramic inner layer, heating resistor and ceramic outer layer of the tube wall are made by first making rectangular sheet-shaped ceramic inner layer green billets and ceramic outer layer green billets, and printing the heating resistor wire green billets and electrode disk green billets on the surface of the ceramic inner layer green billets with resistance slurry, stacking the ceramic outer layer green billets on top, and then rolling them together into a circular tubular ceramic green billet, and then sintering the circular tubular ceramic green billet.

[0010] Preferably, the enamel layer is formed by applying a layer of enamel slurry on the inner surface of the ceramic inner layer and then sintering the enamel slurry.

[0011] Preferably, the ceramic inner layer or the ceramic outer layer is made of dense ceramic material.

[0012] Preferably, the constituent material of the ceramic inner layer or the ceramic outer layer includes at least one of silicon nitride, silicon carbide, aluminum oxide, zirconium oxide, aluminum nitride, and tantalum nitride.

[0013] Preferably, the ceramic inner layer is made of a ceramic material that is easily heat-conducting, and the ceramic outer layer is made of a ceramic material that is not easily heat-conducting.

[0014] Preferably, the constituent material of the heating resistance wire includes at least one of nickel-chromium alloy, silver-aluminum alloy, silver-palladium alloy, and silver-platinum alloy.

[0015] Preferably, the constituent material of the enamel layer includes glass glaze.

[0016] Another technical solution of the present invention is achieved as follows: A method for manufacturing a ceramic heating tube of an electronic smoking device comprises the following steps:

[0017] S1. Two rectangular sheets of ceramic green sheets are made of ceramic material, including an inner green sheet and an outer green sheet of ceramic;

[0018] S2. A plurality of insulating holes are dug in the middle of the two ceramic green sheets in the longitudinal direction, and a plurality of semi-insulating holes are dug in the longitudinal direction on both sides;

[0019] S3. On the surface of the inner ceramic green sheet, a column of insulating holes is located in the middle, and the heating resistor wire green sheet and the electrode disk green sheet are printed with the prepared resistor paste on both sides;

[0020] S4. Electrode through holes are dug in the ceramic outer green sheet corresponding to the electrode disc green sheet positions of the ceramic inner green sheet;

[0021] S5. Align and laminate the outer ceramic green sheet onto the surface of the inner ceramic green sheet on which the heating resistor wire green sheet and the electrode disk green sheet are printed, wherein the electrode through-holes of the outer ceramic green sheet are aligned with the electrode disk green sheet of the inner ceramic green sheet, and the thermal insulation through-holes and semi-thermal insulation through-holes of the outer ceramic green sheet are aligned with the thermal insulation through-holes and semi-thermal insulation through-holes of the inner ceramic green sheet;

[0022] S6. The stacked ceramic inner layer green body and the ceramic outer layer green body are rolled together with a jig into a cylindrical ceramic green body, and several semi-insulated through holes on both sides are aligned to form several complete insulating through holes;

[0023] S7. The cylindrical ceramic green body is placed in a sintering furnace and sintered to obtain a ceramic inner layer, a heating resistor and a ceramic outer layer sintered into one;

[0024] S8. After the ceramic inner layer is coated with a layer of enamel slurry and then placed in a sintering furnace for sintering, the enamel layer, the ceramic inner layer, the heating resistor and the ceramic outer layer are sintered into one;

[0025] S9. Weld one end of the electrode lead to the electrode disk through the electrode through-hole of the ceramic outer layer to obtain a ceramic heating tube.

[0026] The ceramic heating tube of the electronic smoking device of the present invention has the following beneficial effects: the ceramic heating tube of the electronic smoking device of the present invention has at least two rows of thermal insulation holes longitudinally arranged in its tube wall. The thermal insulation holes can circumferentially divide the tube wall into at least two heat-conducting regions. When the electronic smoking device is preheated, all power can be concentrated on one heat-conducting region, concentrating the heat there. This heat-conducting region can then heat up quickly, thereby locally heating a portion of the cigarette, allowing smoke to be drawn out more quickly. Meanwhile, another portion of the cigarette remains unheated. When the user inhales, the airflow passing through this portion is at a lower temperature, mixing with the airflow from the heated portion, lowering the temperature of the smoke initially drawn out and preventing smoke from burning the mouth. During normal operation of the electronic smoking device, the cigarette has been preheated and its heating temperature has reached the operating temperature. At this time, the two groups of heating resistors in the two heat-conducting regions can be energized simultaneously to evenly heat the outer wall of the cigarette, maintaining the normal operating temperature and preventing uneven heating of the cigarette outer wall.

[0027] The heating resistor is located between the inner and outer ceramic layers, shielding it from the outside world. This provides excellent protection against corrosion and damage caused by oxidation during high-temperature operation or contamination from smoke, tobacco impurities, soot, and other contaminants. The heating resistor is printed with resistor paste and then sintered together with the inner and outer ceramic layers to form a single piece. This allows for identical or similar expansion coefficients. During alternating high and low temperature expansion and contraction, the resistor circuit is protected from deformation or breakage due to uneven expansion or contraction caused by significant differences in expansion coefficients. This ensures the heating resistor is resistant to damage, enabling long-term operation and maintaining stable resistance and heating properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The three-dimensional structure of the ceramic heating tube according to the embodiment of the present invention Figure 1 ;

[0029] Figure 2 The three-dimensional structure of the ceramic heating tube according to the embodiment of the present invention Figure 2 ;

[0030] Figure 3 is a cross-sectional view of a ceramic heating tube according to an embodiment of the present invention;

[0031] Figure 4 This is a partial enlarged cross-sectional view of the tube wall of the ceramic heating tube according to an embodiment of the present invention;

[0032] Figure 5 This is an exploded front view of a ceramic heating tube according to an embodiment of the present invention;

[0033] Figure 6 This is a front view of a ceramic inner layer green body according to an embodiment of the present invention;

[0034] Figure 7This is a front view of a ceramic outer layer green body according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present 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 only used to explain the present invention and are not intended to limit the present invention.

[0036] Example 1

[0037] like Figure 1 、 Figure 2 As shown, the ceramic heating tube of the electronic smoking device of the present invention is composed of a tube wall 100, a tube cavity 200, and an electrode lead 5. The tube cavity 200 is enclosed by the tube wall 100 and is used to insert and accommodate a cigarette (not shown in the figure). The tube wall 100 is provided with two rows of thermal insulation holes 101 in the longitudinal direction, and each row of thermal insulation holes 101 includes four thermal insulation holes 101. The thermal insulation holes 101 provided longitudinally on the tube wall 100 can largely isolate the mutual conduction of heat on the left and right sides thereof. Therefore, the thermal insulation holes 101 divide the tube wall into two heat-conducting areas 102 and 103 in the circumferential direction. The heat of these two heat-conducting areas is not conducted in the circumferential direction, but can be conducted in the radial direction.

[0038] like Figure 3-Figure 7 As shown, the tube wall 100 includes a glaze layer 1, a ceramic inner layer 2, a heating resistor 3, and a ceramic outer layer 4, which are connected radially from the inside to the outside and sintered into one body. The heating resistor 3 includes a heating resistor wire 31 and an electrode disk 32 connected to both ends of the heating resistor wire 31. The electrode disk 32 is used to facilitate connection with the electrode lead 5. The heating resistor wire 31 and the electrode disk 32 are both formed by printing a resistor paste on the outer surface of the ceramic inner layer green body 61 or the inner surface of the ceramic outer layer green body 62, then rolling it into a circular tubular ceramic green body and sintering it as a whole. The ceramic inner layer green body 61 is sintered to form the ceramic inner layer 2, and the ceramic outer layer green body 62 is sintered to form the ceramic outer layer 4. A set of heating resistors 3 is respectively provided between the ceramic inner layer 2 and the ceramic outer layer 4 where each heat conducting area 102 and 103 is located. In addition, the ceramic outer layer 4 is provided with an electrode through-hole 40 at the electrode disk 32, and one end of the electrode lead 5 is welded to the electrode disk 32 through the electrode through-hole 40. When powered, heating resistor 3 generates heat and conducts the heat to the ceramic inner layer 2 and enamel layer 1. These layers further conduct the heat to the outer wall of the cigarette, baking it and producing inhalable smoke or aerosol. The ceramic inner layer 2 and outer layer 4 inherently have excellent insulating properties, eliminating the need for a separate insulating layer for heating resistor 3.

[0039] In this embodiment, the resistance paste used for the heating resistor wire 31 or the electrode disk 32 is prepared from nickel-chromium alloy powder, adhesive such as acrylic acid or polyurethane, solvent such as terpineol, organic carrier such as resin or plasticizer, high-temperature adhesive such as glass powder, etc.

[0040] In this embodiment, the two groups of heating resistors 3 can be energized separately or simultaneously, so that the two heat-conducting areas 102 and 103 can be heated separately or simultaneously, thereby controlling the heating method. When the electronic cigarette device begins to preheat, one of the two heat-conducting areas 102 and 103 is energized separately. The heat in the heat-conducting area where the heating resistors 3 are located is isolated by the thermal insulation holes 101, making it difficult for the heat to be transferred to the heat-conducting area of ​​the other heating resistors 3 that is not in operation. That is, when one of the heating resistors 3 is energized and heated, the heat is only transferred to the cigarette from the heat-conducting area where the heating resistors 3 are located. Thus, when the electronic cigarette device is turned on and preheated, all power can be concentrated on one set of heating resistors, concentrating heat in a single heat-conducting area. This heat-conducting area can then heat up quickly, thereby locally heating a portion of the cigarette, allowing smoke to be drawn out more quickly. Meanwhile, another portion of the cigarette remains unheated. When the user inhales, the airflow passing through this portion is at a lower temperature, mixing with the airflow from the heated portion, lowering the initial temperature of the smoke and preventing burns. During normal operation of the electronic cigarette device, the cigarette has been preheated and its heating temperature has reached the operating temperature. At this point, the two sets of heating resistors 3, where the two heat-conducting areas 102 and 103 are located, are simultaneously energized, uniformly heating the cigarette's outer wall through the entire inner wall of the ceramic inner layer 2 and the enamel layer 1, maintaining a normal operating temperature and preventing uneven heating of the cigarette's outer wall.

[0041] In this embodiment, the heating resistor 3 is positioned between the ceramic inner layer 2 and the ceramic outer layer 4, shielding it from the outside world. This protects the heating resistor 3 from corrosion and damage caused by oxidation or contamination by smoke, tobacco impurities, soot, and the like during high-temperature operation, thus providing a protective effect. Furthermore, the heating resistor 3 is formed by printing a resistor paste and then sintering it together with the ceramic inner layer 2 and the ceramic outer layer 4 to form a single unit. These resistors have the same or similar coefficients of expansion. During the alternating expansion and contraction between high and low temperatures, the resistor circuit is not deformed or fractured due to uneven expansion or contraction caused by large differences in expansion coefficients. Consequently, the heating resistor is less susceptible to damage, enabling long-term operation and maintaining stable resistance and heating properties.

[0042] like Figure 5 As shown, the heating resistor wire 31 is formed by a tortuous path on the outer surface of the ceramic inner layer 2 or a partial surface of the inner surface of the ceramic outer layer 4. This allows for a longer path to be formed within a smaller area, thereby increasing resistance, heating power, and heating efficiency. Furthermore, the heating resistor wire 31 is formed by two resistor wires with the same endpoints and parallel paths, thus forming a parallel heating resistor. This parallel heating resistor connection increases the heating area of ​​the heating resistor wire and provides uniform heating. Parallel paths refer to two paths running side by side, including straight and circuitous paths with identical shapes.

[0043] like Figure 6 、 Figure 7 As shown, in this embodiment, the ceramic inner layer 2, heating resistor 3, and ceramic outer layer 4 in the tube wall are made of ceramic material into rectangular sheets of ceramic inner layer green sheets 61 and ceramic outer layer green sheets 62. The surface of the ceramic inner layer green sheet 61 is printed with a resistance slurry to form a heating resistor wire green sheet 310 and an electrode disk green sheet 320. Another ceramic outer layer green sheet 62 is then stacked on top and rolled together to form a circular tubular ceramic green sheet. The circular tubular ceramic green sheet is then sintered to form the green sheet. In addition, the enamel layer 1 is formed by applying a layer of enamel slurry to the inner surface of the ceramic inner layer 2 and then sintering it. In other embodiments, during the green sheet production, the inner surface of the ceramic outer layer green sheet 62 can also be printed with a resistance slurry to form the heating resistor wire green sheet 310 and the electrode disk green sheet 320.

[0044] In this embodiment, the tube wall 100 is provided with two rows of thermal insulation holes 101 in the longitudinal direction, each row of thermal insulation holes 101 including four thermal insulation holes 101. The thermal insulation holes 101 circumferentially divide the tube wall into two heat-conducting regions 102 and 103. A group of heating resistors 3 is respectively provided between the ceramic inner layer 2 and the ceramic outer layer 4 where each heat-conducting region 102 and 103 is located. In other embodiments, the tube wall 100 may also be provided with more than two rows of thermal insulation holes 101 in the longitudinal direction, each row of thermal insulation holes 101 may include one to several thermal insulation holes 101. The thermal insulation holes 101 may circumferentially divide the tube wall into two or more heat-conducting regions, and two or more groups of heating resistors 3 may also be respectively provided between the ceramic inner layer 2 and the ceramic outer layer 4 where each heat-conducting region is located.

[0045] In this embodiment, the ceramic inner layer 2 or the ceramic outer layer 4 is made of a dense ceramic material. The dense ceramic material has better strength and high temperature resistance and is not prone to deformation and damage when working at high temperatures.

[0046] In this embodiment, the main constituent material of the ceramic inner layer 2 or the ceramic outer layer 4 is alumina. In other embodiments, the main constituent material of the ceramic inner layer or the ceramic outer layer is at least one of silicon nitride, silicon carbide, aluminum oxide, zirconium oxide, aluminum nitride, and tantalum nitride.

[0047] In this embodiment, the ceramic inner layer 2 and the ceramic outer layer 4 are made of a ceramic material that is highly thermally conductive. In other embodiments, the ceramic inner layer 2 is made of a ceramic material that is highly thermally conductive, and the ceramic outer layer 4 is made of a ceramic material that is less thermally conductive. The less thermally conductive ceramic material allows the heat of the heating resistor 3 to be better conducted toward the ceramic inner layer 2 and avoids conduction toward the ceramic outer layer 4, thereby better utilizing thermal energy and avoiding heat loss.

[0048] In this embodiment, the main constituent material of the heating resistor wire 3 is nickel-chromium alloy. In other embodiments, the main constituent material of the heating resistor wire 3 is at least one of silver-aluminum alloy, silver-palladium alloy, and silver-platinum alloy.

[0049] In this embodiment, the enamel layer 1 is composed of a material comprising glass glaze. Conventional heating tubes come into direct contact with cigarettes. When operating at high temperatures, cigarette smoke, oil, and soot easily adhere to the inner wall of the heating tube and are difficult to clean. This reduces the heat transfer efficiency of the heating tube, thereby affecting the temperature of the heated cigarette and reducing the amount of smoke. The inner wall of the heating tube in this embodiment is composed of an enamel layer, which has excellent resistance to the adhesion of oil and soot and is easy to clean. Glass glaze is smoother and more heat-resistant, making it easier to clean and not affecting heat transfer efficiency during long-term operation.

[0050] Example 2

[0051] like Figure 3-Figure 7 As shown, the manufacturing method of the ceramic heating tube of the electronic smoking device of the present invention includes the following steps:

[0052] S1. Two rectangular sheets of ceramic green sheets made of ceramic material include an inner ceramic green sheet 61 and an outer ceramic green sheet 62;

[0053] S2. A plurality of insulating holes 101 are dug in the middle of the two ceramic green sheets 61 and 62 in the longitudinal direction, and a plurality of semi-insulating holes 1010 are dug in the longitudinal direction on both sides;

[0054] S3. On the surface of the inner ceramic green sheet 61, a column of insulating holes 101 are located in the middle, and the heating resistor wire green sheet 310 and the electrode disk green sheet 320 are printed with the prepared resistor paste.

[0055] S4. Electrode through holes 40 are dug in the ceramic outer green sheet 62 corresponding to the electrode disc green sheet 320 positions of the ceramic inner green sheet;

[0056] S5. Align and laminate the outer ceramic green sheet 62 onto the surface of the inner ceramic green sheet 61 on which the heating resistor wire green sheet 310 and the electrode disk green sheet 320 are printed by screen printing, wherein the electrode through-hole 40 of the outer ceramic green sheet 62 is aligned with the electrode disk green sheet 320 of the inner ceramic green sheet 61, and the thermal insulation through-hole 101 and the semi-thermal insulation through-hole 1010 of the outer ceramic green sheet 62 are aligned with the thermal insulation through-hole 101 and the semi-thermal insulation through-hole 1010 of the inner ceramic green sheet 61;

[0057] S6. The stacked ceramic inner layer green body 61 and the ceramic outer layer green body 62 are rolled together with a jig into a cylindrical ceramic green body, and the plurality of semi-insulated through holes 1010 on both sides are aligned to form a plurality of complete insulating through holes 101;

[0058] S7. The cylindrical ceramic green body is placed in a sintering furnace and sintered to obtain a ceramic inner layer 2, a heating resistor 3 and a ceramic outer layer 4 sintered into one;

[0059] S8. After applying a layer of enamel slurry on the ceramic inner layer 2, the sintering furnace is sintered to obtain a glaze layer 1, a ceramic inner layer 2, a heating resistor 3 and a ceramic outer layer 4 sintered into one;

[0060] S9. Through the electrode through-hole 40 of the ceramic outer layer 4, one end of the electrode lead 5 is welded to the electrode disk 32 to obtain a ceramic heating tube.

[0061] In other embodiments, in the above steps, the ceramic inner layer green body can be printed with the heating resistor wire green body and the electrode disk green body, and then rolled into a round tube and pre-sintered, and then the ceramic outer layer green body is rolled on the outside and sintered.

[0062] The above description is merely a preferred embodiment of the present invention, and the above specific embodiment is not intended to limit the present invention. Various variations and modifications are possible within the technical scope of the present invention. Any modifications, alterations, or equivalent substitutions made by a person skilled in the art based on the above description are within the scope of protection of the present invention.

Claims

1. A ceramic heating tube for an electronic smoking device, characterized in that: The invention comprises a tube wall, a tube cavity and an electrode lead, wherein the tube cavity is used to insert and accommodate a cigarette, the tube wall comprises an enamel layer, a ceramic inner layer, a heating resistor and a ceramic outer layer which are connected as a whole from the inside to the outside in a radial direction, the heating resistor comprises a heating resistor wire and an electrode disk connected to both ends of the heating resistor wire, the heating resistor wire and the electrode disk are both made by printing a resistance slurry on the outer surface of the ceramic inner layer green body or the inner surface of the ceramic outer layer green body and then sintering them as a whole, the tube wall is provided with at least two rows of thermal insulation through holes in the longitudinal direction, each row of thermal insulation through holes comprises a plurality of thermal insulation through holes, the The heat-insulating through-holes divide the tube wall into at least two heat-conducting areas in the circumferential direction. At least one group of heating resistors is respectively provided between the ceramic inner layer and the ceramic outer layer where each heat-conducting area is located. The ceramic outer layer is provided with an electrode through-hole at the electrode disk. One end of the electrode lead is welded to the electrode disk through the electrode through-hole. Each group of heating resistors is used to generate heat and conduct heat to the ceramic inner layer and the enamel layer after being energized simultaneously or individually. The ceramic inner layer and the enamel layer further conduct heat to the outer wall of the cigarette to bake it to produce smoke that can be inhaled into the mouth.

2. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: Each group of heating resistance wires is formed by a circuitous route on the outer surface of the ceramic inner layer or a partial surface of the inner surface of the ceramic outer layer.

3. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: Each group of heating resistance wires is composed of two resistance wires with the same endpoints and parallel routes.

4. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The ceramic inner layer, heating resistor and ceramic outer layer of the tube wall are made by first making rectangular sheet-shaped ceramic inner layer green sheets and ceramic outer layer green sheets, printing heating resistor wire green sheets and electrode disk green sheets with resistance slurry on the surface of the ceramic inner layer green sheets, stacking the ceramic outer layer green sheets on top, and then rolling them together into a circular tubular ceramic green sheet, and then sintering the circular tubular ceramic green sheet.

5. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The enamel layer is formed by coating the inner surface of the ceramic inner layer with a layer of enamel slurry and then sintering the enamel slurry.

6. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The ceramic inner layer or the ceramic outer layer is made of dense ceramic material.

7. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The constituent material of the ceramic inner layer or the ceramic outer layer includes at least one of silicon nitride, silicon carbide, aluminum oxide, zirconium oxide, aluminum nitride, and tantalum nitride.

8. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The ceramic inner layer is made of a ceramic material that is easily heat-conducting, and the ceramic outer layer is made of a ceramic material that is not easily heat-conducting.

9. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The heating resistance wire is made of at least one of a nickel-chromium alloy, a silver-aluminum alloy, a silver-palladium alloy, and a silver-platinum alloy.

10. The ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The constituent material of the enamel layer includes glass glaze.

11. A method for manufacturing the ceramic heating tube of the electronic smoking device according to claim 1, characterized in that: The following steps are involved: S1. Two rectangular sheets of ceramic green sheets are made of ceramic material, including an inner green sheet and an outer green sheet; S2. A plurality of insulating holes are dug in the middle of the two ceramic green sheets in the longitudinal direction, and a plurality of semi-insulating holes are dug in the longitudinal direction on both sides; S3. On the surface of the inner ceramic green sheet, a column of insulating holes is located in the middle, and the heating resistor wire green sheet and the electrode disk green sheet are printed with the prepared resistor paste on both sides; S4. Electrode through holes are dug in the ceramic outer green sheet corresponding to the electrode disc green sheet positions of the ceramic inner green sheet; S5. Align and laminate the outer ceramic green sheet onto the surface of the inner ceramic green sheet on which the heating resistor wire green sheet and the electrode disk green sheet are printed, wherein the electrode through-holes of the outer ceramic green sheet are aligned with the electrode disk green sheet of the inner ceramic green sheet, and the thermal insulation through-holes and semi-thermal insulation through-holes of the outer ceramic green sheet are aligned with the thermal insulation through-holes and semi-thermal insulation through-holes of the inner ceramic green sheet; S6. The stacked ceramic inner layer green body and the ceramic outer layer green body are rolled together with a jig into a cylindrical ceramic green body, and several semi-insulated through holes on both sides are aligned to form several complete insulating through holes; S7. The cylindrical ceramic green body is placed in a sintering furnace and sintered to obtain a ceramic inner layer, a heating resistor and a ceramic outer layer sintered into one; S8. After the ceramic inner layer is coated with a layer of enamel slurry and then placed in a sintering furnace for sintering, the enamel layer, the ceramic inner layer, the heating resistor and the ceramic outer layer are sintered into one; S9. Weld one end of the electrode lead to the electrode disk through the electrode through-hole of the ceramic outer layer to obtain a ceramic heating tube.

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