Film type heater and aerosol generating device

Abstract

The invention discloses a film type heater and an aerosol generating device, the film type heater comprises a heating tube, and the heating tube is enclosed by a flexible heating film; the heating tube is arranged on the base, the supporting tube is arranged outside the heating tube in a sleeving mode, or the supporting tube is contained in the heating tube; the supporting pipe is connected with the heating pipe through a connecting piece so as to tension the flexible heating film; the surface of the supporting tube is a smooth mirror surface capable of reflecting infrared rays, or the surface of the supporting tube is provided with a reflecting layer used for reflecting the infrared rays. The heating film can be in direct contact with a heated substance, heat loss in the heating process is reduced, and the heating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of aerosol generating devices, and in particular to a film-type heater and an aerosol generating device. Background Art

[0002] Aerosol generating devices use heaters to heat tobacco, tea leaves, herbs and other materials without burning them to release compounds.

[0003] Currently, heaters for aerosol generating devices are classified into various types, such as insertable and tubular sheathed types. The insertable heater can be inserted into a heated object to heat the heated object, while the tubular sheathed type generally places the heated object into a tubular cavity to heat it.

[0004] The structure of the existing tubular sheathed heater generally includes a tubular substrate, and then a heating element such as a heating sheet, a heating film, etc. is wrapped on the surface of the substrate. After the heating element is heated, the heat is transferred from one side of the substrate to the other side of the substrate by heat conduction to heat the heated material on the other side of the substrate, or, after the heating element is heated, the heat penetrates the substrate by heat radiation to heat the heated material on the other side of the substrate. That is, in the existing tubular sheathed heater, the heating element does not directly contact the heated material, and the heated material and the heating element are separated by a tubular substrate. The tubular substrate is generally made of ceramic, quartz, glass, etc. In order to ensure its own strength and prevent cracking, the wall thickness of the tubular substrate of these materials is relatively thick and cannot be made very thin. In this way, due to the obstruction of the thick tubular substrate, the heat of the heating element still has a large heat loss in the process of transferring to the heated material, affecting the heating efficiency of the entire heater.

[0005] Therefore, the existing technology needs to be improved. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a thin film heater and an aerosol generating device, aiming to enable the heating film to directly contact the heated substance, reduce heat loss during the heating process, and improve heating efficiency.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a thin film heater, which comprises:

[0008] A heating tube, wherein the heating tube is surrounded by a flexible heating film;

[0009] A support tube, wherein the support tube is sleeved outside the heating tube, or the support tube is received inside the heating tube;

[0010] The support tube is connected to the heating tube via a connecting piece to tighten the flexible heating film;

[0011] The surface of the support tube is a smooth mirror surface capable of reflecting infrared rays, or the surface of the support tube is provided with a reflection layer for reflecting infrared rays.

[0012] In some examples, the connecting member includes at least two adhesive rubber rings, and the two adhesive rubber rings are respectively arranged close to two ends of the heating tube.

[0013] In some examples, the support tube is an opaque insulation tube, and an insulation gap is formed between the outer surface of the heating tube and the inner surface of the support tube, and the insulation gap is 1 to 1.5 mm.

[0014] In some examples, the heating film includes an infrared heating film layer, and the infrared heating film layer contains carbon nanotubes that emit infrared rays after being heated.

[0015] In some examples, the infrared heating film layer further comprises graphene and a binder, and the components of the carbon nanotubes, graphene and the binder are:

[0016] 32% to 38% carbon nanotubes, 8% to 15% graphene, and 45% to 50% binder.

[0017] In some examples, the heating film further includes a first insulating layer disposed on an inner surface of the infrared heating film layer, an electrode disposed on an outer surface of the infrared heating film layer, and a second insulating layer.

[0018] In some examples, a heat-sensitive temperature film is further disposed outside the second insulating layer.

[0019] In some examples, the thin film heater manufacturing process includes:

[0020] Preparation of tape casting slurry: carbon nanotubes, graphene, binder, dispersant, wetting agent and leveling agent are used to prepare tape casting slurry;

[0021] Casting: using a casting process to form an infrared heating film layer from the casting slurry;

[0022] Cutting: Cut the infrared heating film layer, the first insulating layer, and the second insulating layer to the preset size;

[0023] Positioning: positioning the cut infrared heating film layer, the first insulating layer, the second insulating layer and the electrode;

[0024] Hot pressing: hot pressing and fusing the positioned layers of membranes and electrodes;

[0025] Coiled tube: The heating tube is formed by coiling tube technology;

[0026] Assembly: Assemble the support tube outside the heating tube.

[0027] In some examples, assembling a support tube outside the heating tube specifically includes:

[0028] First, insert a cylindrical fixture with the same or slightly smaller inner diameter as the heating tube into the heating tube;

[0029] A retaining rubber ring is fixed on the outer wall near the two ends of the heating tube;

[0030] A support tube is placed on the outer sleeve of the heating tube and adjusted to a correct position;

[0031] Filling fixing glue between the two ends of the support tube and the heating tube;

[0032] Drying and curing the injection and fixing glue to form two adhesive rubber rings between the two ends of the support tube and the heating tube;

[0033] Remove the jig.

[0034] In a second aspect, the present invention further provides an aerosol generating device, which includes the aforementioned film-type heater.

[0035] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as implementation methods) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described one by one here.

[0036] Beneficial effects of the present invention:

[0037] 1. Since the heating tube is made of a flexible heating film, the surface of the heating tube is in direct contact with the heated substance, which is equivalent to the heating film being in direct contact with the heated substance, without the spacing of the tubular substrate in the prior art. The heating element of the heater of the present invention is in direct contact with the heated substance, which reduces the heat loss during the heating process of the heater and improves the heating efficiency.

[0038] 2. The contact area between the heating film and the heated material is large, the heating area is large, and the electrothermal conversion efficiency is high, which can reach more than 99%.

[0039] 3. The heating film can be made very thin, which can reduce the volume of the heating element.

[0040] 4. The support tube has the function of heat insulation to prevent the heat of the heating film from diffusing outward and causing heat loss.

[0041] 5. Since there is no tubular substrate to block the heating, the infrared radiation generated by the heating film can penetrate the gaps between the heated materials. Combined with the Brownian motion of the heated material particles and the high-frequency vibration of the heated material particles driven by infrared light waves, the edge and center of the heated material can be heated at the same time. In this way, the center and outer edge of the heated material as a whole can be heated more evenly, and the temperature of the outer edge and center of the heated material can quickly reach a balanced state. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 It is a schematic structural diagram of the first embodiment of the thin film heater of the present invention.

[0044] Figure 2 for Figure 1 Schematic diagram of the longitudinal section of the structure.

[0045] Figure 3 for Figure 2 A magnified schematic diagram of center A.

[0046] Figure 4 for Figure 1 Schematic diagram of the transverse section of the structure.

[0047] Figure 5 for Figure 4 A magnified schematic diagram of point B in the middle.

[0048] Figure 6 for Figure 4 Schematic diagram of heating by emitting infrared light from a structure.

[0049] Figure 7 It is a schematic diagram of the expansion of the multi-layer structure of the heating pipe.

[0050] Figure 8 It is a processing flow chart of the thin film heater of the present invention.

[0051] Fig. 9 It is a schematic diagram of some processing steps of the heating tube of the present invention.

[0052] Description of reference numerals:

[0053] 100-heater, 10-heating tube, 101-heating chamber, 11-heating film, 111-infrared heating film layer, 112-first insulating layer, 113-electrode, 1131-positive electrode, 1132-negative electrode, 114-second insulating layer, 115-thermal sensitive temperature film, 20-support tube, 30-connecting part, 31-adhesive rubber ring, 40-insulation gap. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0056] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0057] The specific implementation examples are as follows, please refer to Figures 1 to 6 The present invention provides a thin film heater 100, comprising:

[0058] The heating tube 10 is surrounded by a flexible heating film 11. The flexible heating film 11 is made into a tubular shape by a winding process or the like to form the heating tube 10. Since the thickness of the heating film 11 itself is much smaller than the thickness of the ceramic tube and glass tube lamp-shaped substrate in the prior art, the present invention can reduce the thickness of the heating tube 10, thereby reducing the absorption of heat by the heating tube 10 itself and improving the conversion of thermal energy. The heating film 11 of the present invention is a resistive heating film, and positive and negative electrodes are arranged on the heating film 11. When the positive and negative electrodes are energized, the resistance in the heating film 11 is connected to the current, and then generates heat to transfer heat outward to heat the heated material.

[0059] The film heater 100 of the present invention further includes a support tube 20, which is sleeved outside the heating tube 10, or received inside the heating tube 10. As an embodiment, Figure 1As shown, the support tube 20 of this embodiment is sleeved outside the heating tube 10. The heating tube 10 has a heating chamber 101. The heating chamber 101 is used to place heated substances such as tobacco, spices, etc. After the heating tube 10 is powered on and heated, the heated substances in the heating chamber are heated to form an aerosol.

[0060] like Figure 1 and Figure 2 As shown, the support tube 20 is connected to the heating tube 10 through a connector 30 to tighten the flexible heating film 11. Since the heating tube 10 of the present invention is a flexible heating film 11, if there is no other structure to support the heating film 11, the entire heating tube 10 is soft and easy to deform. The present invention sets a support tube 20 as a supporting component of the heating tube 10, connects the inner and outer tube walls of the two into a whole through a connector 30, and relies on the strength of the support tube 20 to support the flexible heating film 11 so that the flexible heating film 11 is tightened and tensioned, thereby preventing the heating tube 10 from deforming and collapsing during use.

[0061] The connecting portion 30 can be a rubber block, a rubber ring or other element that bonds and fixes the inner and outer walls of the support tube 20 and the heating tube 10 together, or can be other elements that can fix the inner and outer walls of the support tube 20 and the heating tube 10 together.

[0062] At the same time, the support tube 20 of this embodiment is sleeved on the outside of the heating tube 10, and a part of the heat generated by the heating tube 10 that diffuses outward will be blocked by the support tube 20 to play a role in heat preservation.

[0063] As a method, the surface of the support tube 20 of the thin film heater 100 of the present invention is a smooth mirror surface that can reflect infrared rays. That is, in this embodiment, the surface of the support tube 20 is processed into a smooth mirror surface, such as Figure 6 As shown in , the inner surface of the support tube 20 is a smooth mirror surface. After the heating tube 10 is heated, on the one hand, it heats the heated material in the heating cavity 101 by heat conduction, and on the other hand, when the heating tube 10 is heated, it generates heat radiation, part of which is radiated into the heating cavity 101, and the other part is transmitted to the outside of the heating tube 10. When the infrared rays transmitted to the outside of the heating tube 10 are emitted to the support tube 20, they are reflected by the smooth mirror surface of the inner surface of the support tube 20 and transmitted to the heating cavity 101 again, which can reduce the heat loss in the heat radiation and improve the heating efficiency.

[0064] As another embodiment, a reflective layer (not shown) for reflecting infrared rays is disposed on the surface of the support tube 20 of the present invention. That is, in this embodiment, a reflective layer is disposed on the surface of the support tube 20 to reflect the infrared rays radiated outward by the heating tube 10, so as to reduce the heat loss in the thermal radiation of the heating tube 20 and improve the heating effect. For example, a layer of silver can be electroplated on the surface of the support tube 20 to serve as the reflective layer.

[0065] The connecting member 30 of the embodiment of the present invention includes at least two adhesive rubber rings 31, and the two adhesive rubber rings 31 are respectively arranged near the two ends of the heating tube 10. Figure 1 and Figure 2 As shown, two adhesive rubber rings 31 are respectively located on the upper side wall and the lower side wall of the heating tube 10, and the two adhesive rubber rings 31 respectively stick the upper and lower outer side walls of the heating tube 10 and the upper and lower inner side walls of the support tube 20 together, thereby straightening and tensioning the upper and lower side walls of the heating tube 10, i.e., the heating film 11. It can be understood that in other embodiments, the connecting member 30 can be more adhesive rubber rings 31, such as 3, 4, 5, 6, etc., so as to achieve a better tensioning effect of the heating film 11. The adhesive rubber ring 31 of the embodiment of the present invention can be formed by a glue pouring process.

[0066] Preferably, the support tube 20 of the present invention is an opaque insulation tube, such as a support tube 20 with insulation effect made of a stainless steel tube or a glass wool tube, etc. In this way, the support tube 20 itself is designed as an insulation tube, thereby improving the heat insulation effect of the support tube 20.

[0067] Furthermore, if Figure 1 and 2 As shown, the outer surface of the heating tube 10 and the inner surface of the support tube 20 are spaced to form a heat preservation gap 40, and the heat preservation gap is 1 to 1.5 mm. The heat preservation gap 40 is an air gap. Due to the existence of the air gap, the heat conducted outward by the heating tube 10 is isolated by the air gap and will not be directly conducted to the support tube 20 and quickly dissipated. In this embodiment, the heat preservation gap is set to 1 to 1.5 mm, which can achieve a good heat preservation effect and avoid the overall volume being too large.

[0068] Preferably, the heating film 11 of the present invention includes an infrared heating film layer 111, and the infrared heating film layer 111 contains carbon nanotubes that emit infrared rays after being heated. Carbon nanotubes have electrical resistance properties, and can emit infrared rays after being powered on and heated, and have good infrared radiation performance. The present invention uses carbon nanotubes to make the infrared heating film layer 111, which can greatly improve the infrared heating capacity of the heating film 11 of the heater 100 of the present invention, that is, the heating film 11 of the present invention can not only heat the heated material directly in contact with the heating film 11 by heat conduction, but also heat the heated material by infrared thermal radiation, and the infrared thermal radiation can pass through the gaps between the heated materials and reach the center of the heated material, so that the edge and center of the heated material can be heated at the same time, so that the center and outer edge of the heated material as a whole are heated more evenly, and the heated material can quickly reach a temperature equilibrium state, avoiding that part of the heated material is damaged by high temperature while other parts are not heated.

[0069] Furthermore, the infrared heating film layer 111 of the present invention also contains graphene and a binder. The components of the carbon nanotubes, graphene, and binder in the infrared heating film layer 111 are: 32% to 38% carbon nanotubes, 8% to 15% graphene, and 45% to 50% binder. That is, in addition to carbon nanotubes, the infrared heating film layer 111 of the present invention also contains graphene and a binder. Both carbon nanotubes and graphene are used as resistance materials, and can emit infrared rays after being powered on and heated. The binder is used to mix and bond the two together to facilitate the subsequent uniform formation of the film surface.

[0070] Carbon nanotubes have good high temperature resistance, but the internal structure of carbon nanotubes has large gaps and high resistance. After adding graphene to the carbon nanotubes, the graphene can fill the gaps between the carbon nanotubes, thereby reducing the resistance of the carbon nanotubes, increasing the overall conductivity of the infrared heating film layer 111, and keeping the infrared heating film layer 111 within a suitable resistance range.

[0071] As a first method, the components of carbon nanotubes, graphene, and binder in the infrared heating film layer 111 of the present invention are: 32% carbon nanotubes, 15% graphene, 45% binder, and the other 8% components include dispersants, wetting agents, leveling agents, etc. The dispersant disperses the carbon nanotubes so that the graphene can enter the gaps between the carbon nanotubes, while the wetting agent and leveling agent help the infrared heating film layer 111 to form a film during the manufacturing process.

[0072] As a second method, the components of carbon nanotubes, graphene, and adhesive in the infrared heating film layer 111 of the present invention are: 35% carbon nanotubes, 10% graphene, 50% adhesive, and the other 5% components include dispersants, wetting agents, leveling agents, etc.

[0073] As a third method, the components of carbon nanotubes, graphene, and adhesive in the infrared heating film layer 111 of the present invention are: 38% carbon nanotubes, 8% graphene, 50% adhesive, and the other 4% components include dispersants, wetting agents, leveling agents, etc.

[0074] like Figure 4 and Figure 5 , Figure 7As shown, the heating film 11 of the present invention also includes a first insulating layer 112 arranged on the inner surface of the infrared heating film layer 111, an electrode 113 and a second insulating layer 114 arranged on the outer surface of the infrared heating film layer 111. The first insulating layer 112 and the second insulating layer 114 insulate the infrared heating film layer 111 and protect the infrared heating film layer 111. The first insulating layer 112 and the second insulating layer 114 are both made of a high-temperature resistant light-transmitting material to form a film, such as a light-transmitting polyimide material. The electrode 113 arranged on the outer surface of the infrared heating film layer 111 includes a positive electrode 1131 and a negative electrode 1132 that are separated from each other. The positive electrode 1131 and the negative electrode 1132 are respectively connected to the positive and negative poles of the power supply to connect the infrared heating film layer 111 to the power supply, so that the infrared heating film layer 111 generates heat and emits infrared rays after being powered on.

[0075] Preferably, a thermosensitive temperature film 115 is further provided outside the second insulating layer 114. The thermosensitive temperature film 115 indirectly senses the temperature of the infrared heating film layer 111 by sensing the temperature of the second insulating layer 114, and then feeds back to the control circuit through the circuit to control the heating power of the infrared heating film layer 111.

[0076] like Figure 8 As shown, the processing of the thin film heater 100 of the present invention includes:

[0077] S61, tape casting slurry preparation: using carbon nanotubes, graphene, binder, dispersant, wetting agent, leveling agent to prepare tape casting slurry.

[0078] S62, casting: using a casting process to form an infrared heating film layer 111 from the casting slurry.

[0079] S63, cutting: cutting the infrared heating film layer 111, the first insulating layer 112, and the second insulating layer 114 to a preset size.

[0080] S64, positioning: positioning the cut infrared heating film layer 111, the first insulating layer 112, the second insulating layer 114 and the electrode 113.

[0081] S65, hot pressing: hot pressing and fusing the positioned layers of membranes and electrodes 113.

[0082] S66, tube rolling: forming the heating tube 10 by using a tube rolling process.

[0083] like Fig. 9 The processing steps S63 to S66 are shown in the figure. The processing steps S63 to S66 can be automatically processed in batches by mechanical equipment to form the heating tube 10 of the present invention.

[0084] S67 , assembling: assembling the support tube 20 outside the heating tube 10 .

[0085] Please refer to Figure 2 In the embodiment of the present invention, assembling the support tube 20 outside the heating tube 10 specifically includes:

[0086] First, a cylindrical fixture having the same or slightly smaller inner diameter as the heating tube 10 is inserted into the heating tube 10 .

[0087] A retaining rubber ring 50 is fixed on the outer wall near the two ends of the heating tube 10 .

[0088] The support tube 20 is placed outside the heating tube 10 and adjusted to the correct position, that is, the two ends of the support tube 20 are aligned in height with the two ends of the heating tube 10 and have the same spacing with the outer wall of the heating tube 10 .

[0089] Fixing glue is injected between the two ends of the support tube 20 and the heating tube 10 .

[0090] The injection and fixing glue is dried and solidified to form two adhesive rubber rings 31 between the two ends of the support tube 20 and the heating tube 10 .

[0091] The jig is taken out to complete the assembly of the support tube 20 and the heating tube 10 .

[0092] The embodiment of the present invention further provides an aerosol generating device (not shown), which includes the above-mentioned film-type heater 100. Since the aerosol generating device includes the above-mentioned film-type heater 100, it has the functions and effects of the film-type heater 100 of the present invention, which will not be described one by one here.

[0093] The film heater 100 and the aerosol generating device 200 of the present invention use a flexible heating film 11 to surround a heating tube 10, and a support tube 20 is arranged inside or outside the heating tube 10. The support tube 20 and the heating tube 10 are connected by a connector 30 to tighten the flexible heating film 11. During use, the heating film 11 is in direct contact with the heated substance, and there is no tubular substrate between the heating film 11 and the heated substance as in the prior art. There is no interval of the tubular substrate, which reduces heat loss during the heating process, and improves the heating efficiency compared with the prior art.

[0094] The above description is only an example to clearly illustrate the present invention, and does not limit the patent scope of the present invention. It is impossible to list all the implementation methods here. All equivalent structural changes made by using the contents of the technical solution of the present invention under the concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A thin film heater, characterized in that: include: A heating tube, wherein the heating tube is surrounded by a flexible heating film; A support tube, wherein the support tube is sleeved outside the heating tube, or the support tube is received inside the heating tube; The support tube is connected to the heating tube through a connecting piece to tension the flexible heating film; The surface of the support tube is a smooth mirror surface capable of reflecting infrared rays, or the surface of the support tube is provided with a reflection layer for reflecting infrared rays.

2. The thin film heater according to claim 1, characterized in that: The connecting member comprises at least two adhesive rubber rings, and the two adhesive rubber rings are respectively arranged close to the two ends of the heating tube.

3. The thin film heater according to claim 1, characterized in that: The support tube is an opaque insulation tube, and an insulation gap is formed between the outer surface of the heating tube and the inner surface of the support tube, and the insulation gap is 1 to 1.5 mm.

4. The thin film heater according to claim 1, characterized in that: The heating film comprises an infrared heating film layer, and the infrared heating film layer contains carbon nanotubes that emit infrared rays after being heated.

5. The thin film heater according to claim 4, characterized in that: The infrared heating film layer further comprises graphene and a binder, and the components of the carbon nanotubes, graphene and the binder are: 32% to 38% carbon nanotubes, 8% to 15% graphene, and 45% to 50% binder.

6. The thin film heater according to claim 4, characterized in that: The heating film further includes a first insulating layer arranged on the inner surface of the infrared heating film layer, an electrode and a second insulating layer arranged on the outer surface of the infrared heating film layer.

7. The thin film heater according to claim 6, characterized in that: A heat-sensitive temperature film is also arranged outside the second insulating layer.

8. The thin film heater according to claim 6, characterized in that: The processing of the thin film heater includes: Preparation of tape casting slurry: carbon nanotubes, graphene, binder, dispersant, wetting agent and leveling agent are used to prepare tape casting slurry; Casting: using a casting process to form an infrared heating film layer from the casting slurry; Cutting: Cut the infrared heating film layer, the first insulating layer, and the second insulating layer to the preset size; Positioning: positioning the cut infrared heating film layer, the first insulating layer, the second insulating layer and the electrode; Hot pressing: hot pressing and fusing the positioned layers of membranes and electrodes; Coiled tube: The heating tube is formed by coiling tube technology; Assembly: Assemble the support tube outside the heating tube.

9. The thin film heater according to claim 8, characterized in that: Assembling the support tube outside the heating tube specifically includes: First, insert a cylindrical fixture with the same or slightly smaller inner diameter as the heating tube into the heating tube; A retaining rubber ring is fixed on the outer wall near the two ends of the heating tube; A support tube is placed on the outer sleeve of the heating tube and adjusted to a correct position; Filling fixing glue between the two ends of the support tube and the heating tube; Drying and curing the injection and fixing glue to form two adhesive rubber rings between the two ends of the support tube and the heating tube; Remove the jig.

10. An aerosol generating device, characterized in that: The invention comprises a thin film heater as claimed in any one of claims 1 to 9.

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