CN111134372A - Heating element, atomizer and electronic cigarette - Google Patents

Heating element, atomizer and electronic cigarette Download PDF

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Publication number
CN111134372A
CN111134372A CN201811303525.7A CN201811303525A CN111134372A CN 111134372 A CN111134372 A CN 111134372A CN 201811303525 A CN201811303525 A CN 201811303525A CN 111134372 A CN111134372 A CN 111134372A
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heating element
protective layer
heat
heating
generating
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CN201811303525.7A
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CN111134372B (en
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邱伟华
缪晓莉
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Changzhou Paiteng Electronic Technology Co Ltd
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Changzhou Paiteng Electronic Technology Co Ltd
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Priority to CN201811303525.7A priority Critical patent/CN111134372B/en
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Abstract

The invention relates to the technical field of electronic cigarettes, in particular to a heating element, an atomizer and an electronic cigarette. The heating element comprises a heating part, two connecting parts connected with the heating part and a protective layer arranged on the heating part, wherein the heating part and the two connecting parts are both conductive, the protective layer is insulating, the two connecting parts are in contact with different parts of the heating part and are arranged at intervals, at least two through grooves are arranged on the heating part at intervals, an aerosol forming substrate is in contact with the protective layer when the heating element is used, the protective layer is arranged between the aerosol forming substrate and the heating part at intervals, and heat generated by the heating part under electric drive is transferred to the aerosol forming substrate through the protective layer. The protective layer is arranged on the heating part of the heating element, so that the smoke liquid and carbide generated by burning the liquid guide part at high temperature can be prevented from being deposited on the heating part, the heating efficiency of the heating element is improved, and the service life of the heating element is prolonged.

Description

Heating element, atomizer and electronic cigarette
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to a heating element, an atomizer and an electronic cigarette.
Background
At present, the tobacco juice is conducted to the liquid suction piece of electronic cigarette often adopting liquid guide cotton, glass fiber etc. however, under high temperature, liquid guide cotton and glass fiber even tobacco juice etc. are easily burnt, and the easy deposit of carbon that the burning produced is on heating element, and then influences heating element's heating performance, reduces heating element's life.
Disclosure of Invention
Accordingly, there is a need for a method of manufacturing a heating element, an atomizer, and an electronic cigarette.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for preparing a heating element comprises a heating part, two connecting parts connected with the heating part and a protective layer arranged on the heating part, the heating part and the two connecting parts are both conductive, the protective layer is insulating, the two connecting parts are in contact with different parts of the heating part, the two connecting parts are arranged at intervals, the heating part is provided with at least two through grooves at intervals, the heating element is used for an electronic cigarette, the electronic cigarette comprises a liquid storage cavity and a liquid guide piece communicated with the liquid storage cavity, the liquid guide piece is in contact with the protective layer, when in use, the liquid guide piece absorbs the tobacco juice in the liquid storage cavity, the heat generated by the heating part under the electric drive is transferred to the protective layer, the protective layer heats the tobacco juice adsorbed on the liquid guide part, and the preparation method of the heating element comprises the following steps:
1) at least two through grooves are arranged on the heating part at intervals, and the through grooves penetrate through two opposite surfaces of the heating part;
2) the method includes preheating the heating part, coating ceramic paint on at least one of two opposite surfaces of the heating part penetrated by the through groove, and sintering to form the protective layer made of the ceramic paint on the heating part, wherein the protective layer avoids the notch of the through groove.
Further, in the step 1), at least two through grooves are formed in the heating part at intervals by a chemical etching method.
Further, the heating part is roughened in step 2) before preheating, and the roughening treatment is performed by sand blasting, rough turning, thread turning, galling, laser etching or chemical etching. The coarsening treatment ensures that the surface of the heating part obtains certain roughness, improves the mechanical property of the surface of the heating part, increases the adhesive force between the surface of the heating part and the protective layer, and is beneficial to forming a plurality of uniformly distributed micron-nanometer mastoids on the surface of the protective layer.
Further, the preheating condition in the step 2) is preheating for 5-10min at 60-80 ℃.
Further, the method of applying the ceramic coating on the heat generating part in step 2) is spraying or vapor deposition.
Further, the spraying is any one of cold spraying, ultra-speed flame spraying, subsonic flame spraying, plasma spraying and explosion spraying.
Further, after the ceramic coating is coated on the heating part and before sintering, the heating element enables the protective layer to be leveled uniformly in a walking, rotating or vibrating mode.
Further, the ceramic coating in the step 2) is any one or more of silicon oxide, silicon carbide, silicon nitride, aluminum oxide, aluminum nitride, yttrium oxide and zirconium oxide.
Further, the silicon oxide is SixOy，y≥2x。
Further, the sintering in the step 2) is sintering at 160-200 ℃ for 10-15 min.
Further, in step 2), the connecting portion is clamped with a jig after the heating portion is preheated and before the ceramic paint is applied to the heating portion.
Further, the heating element is placed in a solvent for ultrasonic cleaning before the above-mentioned roughening treatment. The solvent is one or two of ethanol and acetone. And cleaning the heating element to remove impurities, oil stains and the like on the surface, and drying for later use after cleaning.
Furthermore, the coarsening treatment mode is sand blasting, and any one of blasting materials such as copper ore sand, quartz sand, carborundum, iron sand and Hainan sand is subjected to sand blasting.
Furthermore, the coarsening treatment mode is sand blasting, and the spraying material subjected to sand blasting is carborundum with the specification of No. 60-80.
Further, the ceramic coating is formed by mixing silicate particles and an alcohol solvent.
Further, the ceramic coating also comprises a curing agent and/or a coloring agent.
Further, the curing agent is a phenolic aldehyde amine curing agent.
Further, the colorant is an oxide of iron.
Further, the colorant is ferroferric oxide.
The utility model provides a heating element for atomizer or electron cigarette of electron cigarette, heating element include the portion of generating heat, with two connecting portions that the portion of generating heat is connected and set up and be in protective layer on the portion of generating heat, the portion of generating heat with two connecting portions all have electric conductivity, the protective layer has insulating nature, two connecting portions with the different parts of the portion of generating heat contact, just two connecting portion intervals set up, during the use, aerosol form substrate with the protective layer contacts, the protective layer separates to be established aerosol form substrate with between the portion of generating heat, the heat that the portion of generating heat produced under the electric drive passes through the protective layer is transmitted for aerosol forms substrate.
Further, the protective layer is a ceramic layer.
Further, the material of the protective layer is any one or more of silicon oxide, silicon carbide, silicon nitride, aluminum oxide, aluminum nitride, yttrium oxide and zirconium oxide.
Further, the thickness of the protective layer is 5-35 μm. The thickness of the protective layer is thin, so that the thermal response is fast.
Further, the thickness of the heating part is 145-165 μm.
Further, the heat generating portion and the connecting portion are both made of metal.
Further, the metal is any one or more of aluminum alloy, copper alloy, magnesium alloy, nickel-chromium alloy, titanium alloy, high-speed steel, stainless steel, iron, aluminum, copper, nickel and titanium.
Further, the length of the heating part is 9.5 mm-10.5 mm.
Further, the heating element is a heating sheet or a heating cylinder, and the heating part is provided with at least two through grooves at intervals.
Furthermore, the length of the through groove is 9.5-10.5 mm, and the width of the through groove is 0.5-0.6 mm.
Further, the heating element is a heating sheet, the through groove penetrates through the upper surface and the lower surface of the heating part, the protective layer is arranged on at least one of the upper surface and the lower surface of the heating part, and the protective layer avoids the notch of the through groove.
Furthermore, the two connecting parts are symmetrically arranged at two opposite ends of the heating part, and the through grooves at the two ends of the heating part are connected with the connecting parts and the adjacent two through grooves through connecting sections.
Furthermore, a partition wall is arranged in each through groove, and the partition wall divides each through groove into a first through groove and a second through groove.
An atomizer, the atomizer includes heating element mount pad and the aforesaid arbitrary heating element, heating element installs on the heating element mount pad.
An electronic cigarette comprises a power supply device and any one of the heating elements, wherein the heating element is electrically connected with the power supply device.
An atomizer, the atomizer includes atomizer main part, heating element and leads liquid spare, be provided with the stock solution chamber in the atomizer main part, heating element sets up the one end of atomizer main part, the stock solution chamber with lead liquid spare intercommunication, heating element includes the portion of generating heat, with two connecting portion that the portion of generating heat is connected and set up the inoxidizing coating on the portion of generating heat, the portion of generating heat and two connecting portion all have electric conductivity, the inoxidizing coating has insulating properties, two connecting portion with the different parts of the portion of generating heat contact, and two connecting portion interval sets up, the portion of generating heat is gone up the spaced apart and is equipped with two at least logical grooves, lead liquid spare with the inoxidizing coating contact sets up, during the use, lead liquid spare absorption the tobacco juice in the stock solution chamber, the heat transfer that the portion of generating heat produced under the electric drive gives the inoxidizing coating, the protective layer heats the tobacco juice adsorbed on the liquid guide piece.
Further, the atomizer still includes connecting device, connecting device with the atomizer main part is provided with heating element's one end can be dismantled and be connected, connecting device includes the mount pad, set up the accepting groove on the mount pad, drain detachably accept in the accepting groove.
Further, the protective layer is a ceramic layer.
Furthermore, the heating element is a heating sheet, the heating portion is provided with at least two through grooves at intervals, the through grooves penetrate through the upper surface and the lower surface of the heating portion, the protective layer is arranged on at least one of the upper surface and the lower surface of the heating portion, and the protective layer avoids the notches of the through grooves.
An electron cigarette, the electron cigarette includes power supply unit and above-mentioned arbitrary atomizer, the atomizer with power supply unit electric connection.
The heating element of the invention also has the following beneficial effects:
1) the environment-friendly heating element is non-combustible, is resistant to dry burning and resists high temperature of more than 600 ℃, so that the phenomenon that a user can damage the heating element and harm the health of the user due to overhigh temperature under the condition of improper use is avoided.
2) Low-temperature sintering, wherein the sintering temperature in the preparation process is only 160-200 ℃, so that the energy can be saved, and the emission of carbon dioxide can be reduced.
3) When used at high temperature, the paint does not emit toxic and harmful gases and has no pollution to the environment.
4) The rough structure of the protective layer on the surface of the heating part has hydrophobic and oleophobic characteristics, so that the heating element can be further protected from being polluted, and the deposition of carbide can be prevented.
5) Has excellent hardness, and has excellent weather resistance, corrosion resistance and wear resistance.
6) The protective layer arranged on the heating part has a far infrared function when used at high temperature, can assist in heating and improves the heating effect of the heating element.
Drawings
Fig. 1 is a schematic structural diagram of a heating element according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of an atomizer in an electronic cigarette according to a second embodiment of the present invention;
FIG. 3 is an exploded view of the atomizer shown in FIG. 2;
FIG. 4 is a schematic view of the structure of the attachment member of the atomizer shown in FIG. 2;
FIG. 5 is a cross-sectional view of the atomizer shown in FIG. 2;
FIG. 6 is a cross-sectional view of the atomizer shown in FIG. 2 from another perspective;
FIG. 7 is an EDS test chart of a heat generating portion of a heat generating element in the first experimental example;
FIG. 8 is an SEM image of a connecting portion of a heating element in a first experimental example;
FIG. 9 is an SEM image of a heat generating portion of a heat generating element in the first example;
FIG. 10 is an SEM image of a cross section of a heat generating part in the first experimental example.
The names and the numbers of the parts in the figure are respectively as follows:
nebulizer 100 reservoir 10 cap assembly 20 vent assembly 30
Spacing seat 24 of liquid storage cavity 101 of base 50 of atomization assembly 40
The communicating member 21 movable member 22 decoration cover 23 boss portion 241
Locking groove 242 sealing air inlet 211 filling opening 212 with 243 sealing ring 243
Sealing element 25 limiting hole 222 locking groove 213 elastic element 26
Air regulating port 291 of locking piece 27, cigarette holder 28, air regulating piece 29
The limiting part 311 of the smoke outlet pipe 32 of the air inlet pipe 31 protrudes 312
Lower fluid hole 313 connector 41 mounting seat 42 liquid guide 43
Connecting hole 412 of connecting seat 45 smoke-permeable slot 411 of heating element 44
Liquid outlet 413 for accommodating groove 421 of insulating member 461 and first electrode contact member 46
Second electrode contact 47 stopper 49 bolt 444 connecting block 452
Sealing ring 453, third electrode contact 48, first connecting tube 214, second connecting tube 215
Air channel 216 third connecting pipe 217 inlet channel 314 smoke outlet channel 321
The connecting column 414 protrusion 3111 through hole 3112 communication port 218
Through groove 443 of connecting part 442 of heating part 441 of air vent 221
First through slots 4431 and second through slots 4432 partition walls 4433 connect the segments 444
Mounting hole 445
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.
Example one
Referring to figure 1, the present embodiment provides a heating element 44 for use in an electronic cigarette to heat an aerosol-forming substrate. The aerosol-forming substrate may be a tobacco liquid, a tobacco paste or tobacco cut filler. The heat generating element 44 includes a heat generating portion 441, two connecting portions 442 connected to the heat generating portion 441, and a protective layer (not shown) provided on the heat generating portion 441. The heat generating portion 441 and the two connecting portions 442 are made of a conductive material, and the protective layer is made of an insulating material. When the electronic cigarette is used, the heating element 441 is electrically connected with a power supply device in the electronic cigarette through the two connecting parts 442, so that the power supply device electrically drives the heating portion 441, the protective layer is in contact with the aerosol-forming substrate, heat generated by the heating portion 441 under electric driving is transferred to the aerosol-forming substrate through the protective layer, namely, the heating portion 441 is isolated from the aerosol-forming substrate through the protective layer, and the aerosol-forming substrate is heated to generate smoke. The protective layer serves to prevent or reduce the deposition of carbides of the aerosol-forming substrate at high temperatures and of parts which conduct the aerosol-forming substrate (e.g. liquid conductors for conducting smoke liquid) at high temperatures. Thus, the resistance of the heat generating portion 441 is prevented from being changed by the carbide, thereby preventing the heat generating efficiency from being affected, and the influence of the carbide on the smoke taste can be prevented or reduced.
The shape of the heating element 44 is not limited, and in the present embodiment, the heating element 44 is a heating sheet. It is to be understood that, in other embodiments not shown, the heat generating element 44 may be a heat generating tube, a heat generating rod, a heat generating wire, or a heat generating block, and the protective layer may cover at least one surface of the heat generating portion 441 so as to be interposed between the heat generating portion 441 and the aerosol-forming substrate. Wherein, the heating tube can be obtained by winding the heating sheet into a tube shape.
The connection relationship between the heat generating portion 441 and the two connection portions 442 is not limited as long as the two connection portions 442 are in contact with different portions of the heat generating portion 441 and are spaced apart from each other, so that the two connection portions 442 respectively serve as a positive electrode contact and a negative electrode contact of the heat generating element 44. In the present embodiment, the two connecting portions 442 are symmetrically disposed at two opposite ends of the heat generating portion 441, which is not only beneficial to mass production of the heat generating element 44, but also convenient for mounting and dismounting the heat generating element 44 in the electronic cigarette.
In the present embodiment, the heat generating portion 441 and the two connecting portions 442 are integrally formed, and it is understood that in other embodiments not shown, the heat generating portion 441 and the two connecting portions 442 may be formed separately and then connected together by welding, screwing, or clipping.
In the present embodiment, in order to allow the heat generating portion 441 to perform resistance heating, at least two through grooves 443 are provided at a distance from the heat generating portion 441, and the through grooves 443 are provided to increase the resistance of the heat generating portion 441, thereby performing resistance heating.
In the present embodiment, the through groove 443 penetrates through the upper and lower surfaces of the heat generating portion 441, and the protective layers are disposed on both the upper and lower surfaces of the heat generating portion 441 and avoid the notch of the through groove 443, so that the through groove 443 is not affected, and thus the through groove 443 can be used for the circulation of smoke. Taking the aerosol-forming substrate as an example of a liquid smoke, a user may select any protective layer to be in contact with a liquid guiding member in the electronic cigarette, for example, the protective layer disposed on the upper surface of the heating portion 441 is selected to be in contact with the liquid guiding member, so that the liquid guiding member guides the liquid smoke in the liquid storage cavity of the electronic cigarette to the protective layer on the upper surface of the heating portion 441, the liquid smoke is heated to form smoke, the smoke flows from the upper surface of the heating portion 441 to the lower surface through the through groove 443, flows into the airflow channel from the lower surface of the heating portion 441, flows to the mouthpiece of the electronic cigarette through the airflow channel, and finally flows out through the mouthpiece for the user to smoke. The protective layers are arranged on the upper surface and the lower surface of the heating portion 441, so that the installation of a user can be facilitated, and the user does not need to distinguish the upper surface and the lower surface of the heating portion 441. It will be appreciated that in other embodiments, not shown, the protective layer may be provided on only one of the upper and lower surfaces of the heat-generating portion 441.
In the present embodiment, the two connection portions 442 are used not only for electrical connection of the heat generating element 44 but also for structural connection of the heat generating element 44. Specifically, the connecting portion 442 is provided with a mounting hole 445 to fix the heat generating element 44. During installation, the bolt passes through the installation hole 445 and then is in threaded connection with the heating element installation seat in the electronic cigarette, so that the heating element 44 is fixed. It is to be understood that in other embodiments not shown, a clamping portion may be provided on the heating element mounting base to clamp and fix the connecting portion, and in this case, the mounting hole 445 may be omitted.
In the present embodiment, the heat generating portion 441 and the connecting portion 442 are made of the same material. The heat generating portion 441 and the connecting portion 442 are made of a metal or alloy having electrical conductivity, and may be made of, for example, iron, aluminum, copper, nickel, titanium, an aluminum alloy, a magnesium alloy, a copper alloy, a nickel-chromium alloy, a titanium alloy, high-speed steel, or stainless steel. In the present embodiment, the heat generating portion 441 and the connecting portion 442 are made of stainless steel, and it is understood that in other embodiments not shown, the heat generating portion 441 and the connecting portion 442 may be made of different materials to meet different use requirements, for example, heat generationThe portion 441 and the connecting portion 442 are made of materials having different resistivities, and specifically, the specific resistance of the heat generating portion 441 is greater than that of the connecting portion 442, so that the heat generating portion 441 can generate a large amount of heat for heating the aerosol-forming substrate, while the heat generated by the connecting portion 442 is small, thereby avoiding waste of energy, and reducing the requirement of the parts disposed in contact with the connecting portion 442 or disposed near the connecting portion 442 for heat resistance. The protective layer is a ceramic layer, and the ceramic layer is composed of at least one of silicon oxide, silicon carbide, silicon nitride, aluminum oxide, aluminum nitride, yttrium oxide and zirconium oxide. In the present embodiment, the protective layer is a silicon oxide layer prepared from an alcohol solution of silicate particles, and Si atoms and O atoms form a saturated or supersaturated oxidation state, which can be expressed as SixOyWherein y is more than or equal to 2 x. It will be appreciated that in other embodiments not shown, the protective layer may also be made of other materials, for example enamel or teflon.
In the present embodiment, the thickness of the heat generating portion 441 and the connecting portion 442 are both 145-165 μm.
In the present embodiment, the length of the heat generating portion 441 is 10 ± 0.5mm, the width of the heat generating portion 441 is 10 ± 0.2mm, the width of the through groove 443 is 0.5-0.6mm, the length of the through groove 443 is 10 ± 0.5mm, the through grooves 443 are arranged at intervals in the transverse direction of the heat generating element 44, and the through grooves 443 at both ends and the connecting portion 442, as well as the adjacent two through grooves 443, are connected by the connecting section 444. When current is applied, current flows from one of the connection portions 442 to the heat-generating portion 441, and flows on the heat-generating portion 441 along the groove walls of the connection section 444 and the through groove 443 in a meandering manner to the other connection portion 442. In this embodiment, in order to further increase the resistance of the heat generating portion 441, a partition wall 4433 is further disposed in each through groove 443, and each through groove 443 is divided into a first through groove 4431 and a second through groove 4432, at this time, the number of the connecting sections 444 is doubled, the first through grooves 4431 and the connecting portions 442 at two ends, the two adjacent first through grooves 4431 are connected by the connecting sections 444, the second through grooves 4432 and the connecting portions 442 at two ends, and the two adjacent second through grooves 4432 are connected by the connecting sections 444. When the current flows through the heat generating portion 441, the current needs to pass through the connecting portion 444, the groove wall of the first through groove 4431, the groove wall of the second through groove 4432, and the partition wall 4433 in a meandering manner. In addition, the smaller width of the through slots 443 may prevent non-nebulized aerosol-forming substrate, or non-nebulized, fully aerosol-forming substrate from flowing out through the through slots 443.
In the present embodiment, the heat generating portion 441 is provided with at least two through grooves 443, which facilitates the outflow of smoke, and increases the resistance of the heat generating portion 441, thereby facilitating the resistance heating. The through-groove 443 is opened to make the resistance of the heating element 44 0.2 to 1 Ω, and in the present embodiment, the resistance of the heating element 44 is 0.25 to 0.3 Ω.
The thickness of the protective layer is 5-35 μm, from which it can be seen that the protective layer is relatively thin and therefore the heat generated by the heat generating portion 441 can be quickly transferred to the surface of the protective layer without affecting the heating of the aerosol-forming substrate.
The method for manufacturing a heating element of the present embodiment includes the steps of:
1) the heating part 441 of the heating element 44 is chemically etched to obtain at least two through grooves 443 arranged at intervals, and a partition wall 4433 is left in each through groove 443 to divide each through groove 443 into a first through groove 4431 and a second through groove 4432;
2) placing the heating element 44 in an ultrasonic cleaning machine filled with ethanol and/or acetone solution for ultrasonic cleaning to remove impurities, oil stains and the like on the surface of the heating element 44, and drying for later use after cleaning;
3) the surface of the heating part 441 is subjected to sand blasting treatment to clean and coarsen the surface of the heating part 441, so that the surface of the heating part 441 obtains certain cleanliness and roughness, the mechanical property of the surface of the heating part 441 is improved, the adhesive force between the surface of the heating part 441 and a protective layer is increased, and a plurality of uniformly distributed micron-nanometer mastoids are also formed on the surface of the protective layer, the sand blasting material can be any one of copper ore sand, quartz sand, carborundum, iron sand and Hainan sand, in the embodiment, the sand blasting material is carborundum with the specification of 60-80;
4) blowing floating sand and dust on the surface of the heating element 44 by using compressed air, preheating the heating element 44 at 60-80 ℃ for 5-10min, clamping the connecting part 442 by using a clamp, spraying ceramic paint on the heating part 441 by using spraying equipment to form a protective layer, and cleaning a spray gun of the spraying equipment by using isopropanol and butanone before use to avoid mixing impurities in the paint; the ceramic coating is an alcohol-soluble nano ceramic coating, and in the embodiment, the ceramic coating is formed by mixing nano silicate particles and an alcohol solvent (such as ethanol);
5) and (3) treating the sprayed heating element 44 in at least one of walking, rotating, vibrating and the like to level the coating so as to uniformly distribute the protective layer, and then sintering at the temperature of 160-200 ℃ for 10-15min to obtain the coating.
The two opposite surfaces of the heating element 44 obtained by the above preparation method are provided with the protective layers, the protective layer on the surface of the heating element 44 opposite to the spray gun is thicker than the protective layer on the surface far away from the spray gun, the thickness of the protective layer on the surface of the heating element opposite to the spray gun is 25-35 μm, and the thickness of the protective layer on the surface of the heating element far away from the spray gun is 5-25 μm.
In the present embodiment, since the heat generating element 44 is a heat generating sheet, a plurality of heat generating sheets need to be obtained by pressing a whole sheet before performing step 1).
It is understood that in other embodiments not shown, for step 3), other ways may be used to roughen the surface of the heat-generating portion 441, such as rough turning, threading, roughening, laser etching, or chemical etching.
In step 3), the surface of the heat generating portion 441 is roughened because the roughened surface can be fitted with ceramic particles, so that the protective layer and the heat generating portion 441 are mechanically bonded to each other by forming a mechanical bond.
In step 4), the connecting portion 442 is clamped by a jig, so that the heating element 44 is fixed on one side and the connecting portion 442 is shielded on the other side, thereby preventing the paint from being sprayed onto the connecting portion 442 and affecting the conductivity of the connecting portion 442.
In order to facilitate curing of the coating material, in step 4), the coating material may be mixed with a curing agent into a spray coating device so that the coating material is sprayed together with the curing agent onto the surface of the heat-generating portion 441.
In order to make the coating layer have a color desired by the user, the paint and the colorant may be mixed into the spray coating device in step 4), so that the paint and the colorant are sprayed together onto the surface of the heat-generating portion 441.
In step 4), spraying can be performed by cold spraying or thermal spraying. Thermal spraying includes, but is not limited to, ultra-speed flame spraying, subsonic flame spraying, plasma spraying, and detonation spraying, among others.
In step 5), the heating element 44 is sintered to accelerate curing and drying. In addition, the surface of the heat-generating portion 441 is partially oxidized at a high temperature to form an oxide layer, which facilitates the bonding of the protective layer and the heat-generating portion 441.
After the preheating in step 4), a vapor deposition method may be used to deposit a ceramic coating on the heat generating portion 441 to form a protective layer, and when the vapor deposition method is used, the coating may be directly sintered without leveling in step 5). In particular, physical vapor deposition may be employed, including but not limited to vacuum evaporation, magnetron sputtering, and ion plating. In order to allow the ceramic paint to be well deposited, a bonding layer is provided on the heat generating portion 441 before preheating in step 4), and the heat generating portion 441 and the coating layer are effectively bonded together by the bonding layer.
In the heating element 44 of the present embodiment, the heating portion 441 is provided with the through grooves 443 at intervals, and the through grooves 443 are provided to facilitate the outflow of smoke, and to increase the resistance of the heating portion 441, thereby facilitating the resistance heating; the heating part 441 is further provided with a protective layer, a plurality of micron-nanometer-scale mastoids are formed on the surface of the protective layer, so that an interface structure with alternate concave and convex is formed on the surface of the protective layer, the concave surfaces among the mastoids can absorb gas molecules and enable the gas molecules to stably exist, and further, a stable gas film is formed on the surface of the protective layer, so that water/oil cannot be in direct contact with the surface of the protective layer, the surface of the protective layer presents hydrophobic and oleophobic characteristics, carbides generated by aerosol-forming substrates (such as smoke liquid), liquid guide parts and the like at high temperature are prevented from being deposited on the heating part 441, and the service life of the heating element 44 is prolonged.
Example two
Referring to fig. 2-6, the present embodiment provides a specific application of the heating element 44 described in the first embodiment in an electronic cigarette, which includes an atomizer 100 and a power supply device (not shown) electrically connected to the atomizer 100.
Referring to fig. 2-6, the atomizer 100 includes a liquid storage component 10, a top cover assembly 20 mounted at one end of the liquid storage component 10, a vent assembly 30 disposed below the top cover assembly 20 and contained in the liquid storage component 10, an atomizing assembly 40 disposed at one end of the vent assembly 30 away from the top cover assembly 20, and a base 50 mounted at the other end of the liquid storage component 10 opposite to the top cover assembly 20.
Stock solution spare 10 is approximately upper and lower both ends and has the open-ended cavity tubular structure, is provided with the stock solution chamber 101 that is used for saving the tobacco juice in the stock solution spare 10, and stock solution spare 10 is made by transparent or translucent material to make things convenient for the user to see through stock solution spare 10 and observe the tobacco juice surplus in stock solution chamber 101, be favorable to the user in time to annotate the liquid operation. In the present embodiment, the liquid storage member 10 is made of transparent glass. It should be understood that in other embodiments, not shown, a protecting jacket (not shown) with a window is sleeved outside the liquid storage device 10, and the protecting jacket is made of a hard material such as plastic or metal, so as to protect the liquid storage device 10 and prevent the liquid storage device 10 from being damaged. It will be appreciated that in other embodiments, not shown, the protective cover may also be made of a soft material such as silicone or rubber, which may provide a cushioning effect when the liquid storage member 10 is dropped, thereby preventing damage to the liquid storage member 10.
The upper cover assembly 20 includes a limiting seat 24 disposed on the top of the liquid storage component 10, a communicating component 21 disposed on the limiting seat 24, a movable component 22 mounted on the communicating component 21, and a decorative cover 23 covering the movable component 22.
The limiting seat 24 is a hollow cylindrical structure with openings at the upper and lower ends, and the limiting seat 24 is sleeved in the top end of the liquid storage part 10. The upper end of the limiting seat 24 protrudes outward along the radial direction of the limiting seat 24 to form a boss portion 241 abutting against the top surface of the liquid storage part 10, so as to limit the installation depth of the limiting seat 24 in the axial direction of the liquid storage part 10. Seted up on the outer peripheral face of spacing seat 24 and ended groove 242, it supports the sealing washer 243 of holding with the internal surface of stock solution spare 10 to be equipped with in the end groove 242, in this embodiment, sealing washer 243 is made by sealing materials such as rubber or silica gel, on the one hand, through the frictional force between sealing washer 243 and the stock solution spare 10, prevent that spacing seat 24 from taking off, make spacing seat 24 locate stock solution spare 10 top more firmly, on the other hand, increase the leakproofness between spacing seat 24 and the stock solution spare 10, prevent that the tobacco juice in the stock solution chamber 101 from leaking.
The communicating member 21 is mounted on the stopper seat 24. Specifically, a first connecting pipe 214 and a second connecting pipe 215 are arranged on the lower end surface of the communicating member 21, and the first connecting pipe 214 is sleeved outside the second connecting pipe 215. The communicating member 21 is mounted on the limiting seat 24 by interference fit of the first connecting pipe 214 and the limiting seat 24, and the second connecting pipe 215 is detachably connected with the ventilation assembly 30. At least one air inlet 211 communicated with the outside air is formed on the side wall of the communicating piece 21, and the air inlet 211 is communicated with the atomizing assembly 40 through the air vent assembly 30. In the present embodiment, two air inlets 211 are provided and opposed to each other, a vent groove 216 is provided in the communicating member 21, both ends of the vent groove 216 penetrate and communicate with the corresponding air inlets 211, and a portion of the bottom wall of the vent groove 216 corresponding to the second connecting pipe 215 penetrates so that the vent groove 216 communicates with the second connecting pipe 215. A communication port 218 is formed in the upper end surface of the communicating member 21, a third connecting pipe 217 is arranged on the top wall of the vent groove 216 corresponding to the communication port 218 along the axial direction of the communicating member 21, the upper end of the third connecting pipe 217 penetrates through the top wall of the vent groove 216 and then is communicated with the communication port 218, and the lower end of the third connecting pipe 217 passes through the vent groove 216 and then extends into the second connecting pipe 215. The communicating piece 21 is further provided with a liquid injection port 212 which is isolated from the vent groove 216, the liquid injection port 212 is positioned between the first connecting pipe 214 and the second connecting pipe 215 and axially penetrates through the upper end face and the lower end face of the communicating piece 21 along the communicating piece 21, the liquid injection port 212 is communicated with the liquid storage cavity 101, and when the smoke in the liquid storage cavity 101 is exhausted, a user can inject the smoke into the liquid storage cavity 101 through the liquid injection port 212.
The movable element 22 has a substantially plate-like structure, and the movable element 22 has a vent hole 221 corresponding to the communication port 218. The movable moving piece 22 can move and switch the moving piece 22 between the use position and the liquid filling position relative to the communication piece 21. The movable piece 22 is in the use position relative to the communication piece 21, that is, the movable piece 22 closes the liquid injection port 212, and the communication port 218 is aligned and communicated with the air vent 221 so that the atomized tobacco liquid can be sucked by a user; the movable element 22 being in the liquid filling position with respect to the communication member 21 means that the liquid filling port 212 is at least partially opened by the movable element 22 and the communication port 218 is displaced from the air vent 221 so that the user can fill the liquid reservoir 101 with smoke liquid through the liquid filling port 212. The moveable member 22 may be at least one of rotated, flipped, slid, and detached. In the present embodiment, the movable piece 22 is configured to slide. Specifically, the movable member 22 is provided with a slider (not shown), the communicating member 21 is provided with a sliding groove (not shown), and the movable member 22 is slidably disposed on the upper end surface of the communicating member 21 through the cooperation between the slider and the sliding groove. When the movable member 22 is slid to the position where the movable member 22 is located relative to the communication member 21, the movable member 22 closes the liquid injection port 212, and the communication port 218 is aligned with and communicated with the air vent 221, at this time, a user can perform a suction operation and cannot perform a liquid injection operation; when the movable member 22 is slid to the liquid filling position of the movable member 22 relative to the communication member 21, the liquid filling port 212 is at least partially opened by the movable member 22, and the communication port 218 is displaced from the air vent 221, at which time, the user can perform liquid filling operation through the liquid filling port 212, which is at least partially exposed, and suction operation cannot be performed. The sealing element 25 is arranged at the lower end of the movable element 22 corresponding to the liquid injection port 212, and when the movable element 22 is at the use position, the sealing element 25 can close the liquid injection port 212 so as to improve the sealing performance of the liquid injection port 212 and prevent smoke liquid from leaking. It will be appreciated that the seal 25 may be made of a sealing material such as silicone or rubber.
In this embodiment, a limiting hole 222 is formed in one side of the movable member 22, which is located at the air vent 221 and away from the sealing member 25, the limiting hole 222 penetrates through the upper and lower end faces of the movable member 22, a locking groove 213 is formed in the upper end face of the communicating member 21 corresponding to the limiting hole 222, an elastic member 26 and a locking member 27 are installed in the limiting hole 222, wherein one end of the elastic member 26 is connected with the decorative cover 23, and the other end of the elastic member 26 is connected with the locking member 27. When the movable member 22 slides, the locking member 27 can abut against the upper end surface of the communicating member 21 under the elastic force of the elastic member 26, and when the movable member 22 moves to the use position, the locking member 27 can be locked in the locking groove 213, so as to remind the user that the movable member 22 has moved to a proper position, the user can perform suction operation, the use by the user is facilitated, and the locking member 27 is matched with the locking groove 213 to prevent the movable member 22 from sliding arbitrarily. When the movable member 22 moves from the use position to the filling position, the locking member 27 can compress the elastic member 26 to disengage the locking member 27 from the locking groove 213. It is understood that in other embodiments, not shown, the limiting hole 222 may also be a blind hole penetrating through the lower end surface of the communicating member 21, and in this case, one end of the elastic member 26 is connected to the bottom wall of the limiting hole 222, which can also achieve the above-mentioned effects.
In this embodiment, the locking member 27 is a steel ball, and the elastic member 26 is a spring. It is understood that in other embodiments not shown, the elastic member 26 may be an elastic and rigid element such as a thin stainless steel sheet, a copper elastic sheet, etc., and is not limited herein.
It should be understood that in other embodiments, which are not shown, the movable member 22 and the communicating member 21 may be movably connected by providing an eccentric shaft, or may be connected in a reversible manner, or may be detachably connected by a fastening member such as a bolt or a bolt, and only the movable member 22 needs to be detached during liquid injection. It should be understood that the liquid injection port 212 of the communicating member 21, the movable member 22 and the decorative cover 23 may be omitted, and in this case, the communicating member 21 may be directly removed and the liquid storage chamber 101 may be filled with the smoke liquid.
The decoration cover 23 is a hollow cylindrical structure with openings at the upper end and the lower end, a user can drive the movable piece 22 to slide by pushing the decoration cover 23, and meanwhile, the decoration cover 23 ensures the appearance consistency of the atomizer 100, so that the atomizer is more attractive.
In addition, in the present embodiment, the cover assembly 20 further includes a mouthpiece 28 detachably inserted into the vent 221 and an air adjusting member 29 rotatably sleeved outside the communicating member 21. The two ends of the cigarette holder 28 are through, and the cigarette holder 28 is arranged in the vent hole 221 of the movable piece 22 in a penetrating way and communicated with the vent component 30. Thus, the user inhales the smoke through the mouthpiece 28. It can be understood that, in other embodiments, not shown, the mouthpiece 28 may pass through the air vent 221 and then be inserted into the communication port 218, and since the movable stroke of the movable element 22 is limited after the mouthpiece 28 is connected to the communication element 21, only after the user pulls out the mouthpiece 28, the liquid injection port 212 can be opened by the movable element 22, and since the operation is complicated, the situation that the liquid injection port 212 is easily opened by a child and then contacts or even eats the tobacco liquid in the liquid storage chamber 101 by mistake is prevented, and thus a safety protection function is provided for the child. At least one air adjusting port 291 is formed in the air adjusting piece 29, a user rotates the air adjusting piece 29 to enable the air adjusting piece 29 to rotate relative to the communicating piece 21, when the air adjusting port 291 is at least partially communicated with the air inlet 211, the external air enters the atomizing assembly 40 through the communicating part between the air adjusting port 291 and the air inlet 211, therefore, the user can adjust the air inflow of the external air entering the atomizing assembly 40 through rotating the air adjusting piece 29 according to the requirements of the user, and the use experience of the user is improved.
The ventilation assembly 30 includes an air inlet pipe 31 received in the liquid storage chamber 101 and connected to the second connecting pipe 215, and a smoke outlet pipe 32 received in the air inlet pipe 31 and connected to the third connecting pipe 217.
In the present embodiment, the intake pipe 31 is an electric conductor, and for example, the intake pipe 31 is made of a metal or an alloy material having a good electric conductivity. One end of the air inlet pipe 31, which is far away from the communicating piece 21, protrudes outwards along the radial direction of the air inlet pipe 31 to form a limiting portion 311 which is abutted against the lower end of the liquid storage piece 10, one end of the limiting portion 311, which is far away from the communicating piece 21, protrudes downwards along the axial direction of the air inlet pipe 31 to form a protruding portion 312, and the liquid storage cavity 101 is formed by a space which is formed by enclosing the liquid storage piece 10, the communicating piece 21, the first connecting pipe 214, the second connecting pipe 215, the air inlet pipe 31 and the limiting portion 311 together. The limiting portion 311 is provided with two lower liquid holes 313 communicated with the liquid storage cavity 101, and in the present embodiment, the two lower liquid holes 313 are located at two opposite sides of the air inlet pipe 31. The gap between the air inlet pipe 31 and the smoke outlet pipe 32 and the gap between the second connecting pipe 215 and the third connecting pipe 217 are communicated to form an air inlet channel 314, and the air inlet 211 is communicated with the air inlet channel 314 through the vent groove 216. The outer surface of the upper end of the air inlet pipe 31 and the inner surface of the lower end of the second connecting pipe 215 are relatively fixed by means of screw connection, and it is understood that in other embodiments not shown, the air inlet pipe 31 and the second connecting pipe 215 may be connected by means of snap connection or plug connection.
The smoke outlet pipe 32 is a hollow structure with two through ends, and the smoke outlet pipe 32 is located in the air inlet pipe 31, in the present embodiment, the inner cavity of the smoke outlet pipe 32 is communicated with the inner cavity of the third connecting pipe 217 to form a smoke outlet channel 321, the smoke outlet channel 321 is communicated with the cigarette holder 28 through the communicating port 218 and the vent 221 in sequence, the inner surface of the upper end of the smoke outlet pipe 32 and the outer surface of the lower end of the third connecting pipe 217 are relatively fixed in an inserting manner, it can be understood that in other embodiments not shown, the smoke outlet pipe 32 and the third connecting pipe 217 can also be connected in a threaded connection or a clamping connection or the like.
The atomizing assembly 40 includes a connecting member 41 disposed at the bottom of the limiting portion 311, an installation seat 42 detachably and connectively accommodated in the protruding portion 312 and having an open end, a liquid guiding member 43 disposed in the installation seat 42, a heating element 44 disposed between the liquid guiding member 43 and the connecting member 41 and corresponding to the liquid guiding member 43, and a connection seat 45 disposed below the installation seat 42.
Referring to fig. 4 to 6 again, the connecting member 41 is provided with a smoke passing slot 411 corresponding to the smoke outlet tube 32 for smoke to enter the smoke outlet tube 32, one of two opposite sides of the smoke passing slot 411 is respectively provided with a connecting hole 412 and a connecting column 414 for mounting the heating element 44, and the other two sides of the smoke passing slot 411 are oppositely provided with liquid outlet holes 413 respectively corresponding to the two lower liquid holes 313. In this way, the smoke liquid is directly adsorbed by the liquid guiding member 43 after flowing out through the liquid discharging hole 313 and the liquid discharging hole 413, and does not directly flow onto the heating element 44, so that the situation that the heating element 44 is soaked by the smoke liquid and is difficult to discharge the smoke can be prevented. The limiting portion 311 has a protrusion 3111 corresponding to the connecting hole 412, and the limiting portion 311 has a through hole 3112 corresponding to the connecting column 414. The connecting member 41 is accommodated in the protruding portion 312 and detachably connected to the limiting portion 311, and when the connecting member 41 is connected to the limiting portion 311, the protrusion 3111 is inserted into the connecting hole 412, and the connecting column 414 is inserted into the through hole 3112. In the present embodiment, the upper cover assembly 20, the connecting member 41, the liquid storage member 10, and the ventilation assembly 30 together constitute a nebulizer body (not shown).
The mounting seat 42 is provided with a receiving groove 421 for receiving the liquid guiding member 43.
In the present embodiment, the liquid guide 43 is made of a material that easily absorbs liquid, such as cotton, cotton cloth, and porous ceramics.
The heating element 44 is located below the connecting member 41 and detachably connected to the connecting member 41, and the heating element 44 is provided with mounting holes (not shown) corresponding to the connecting holes 412 and the connecting column 414.
In this embodiment, the heating element 44 and the connecting member 41 are fixed relatively by two bolts 444, the connecting member 41 forms the heating element mounting seat described in the first embodiment, wherein the screw of one bolt 444 passes through one of the mounting holes and then extends into the protrusion 3111 to be in threaded connection with the protrusion 3111, and the screw of the other bolt 444 passes through the other mounting hole and then extends into the connecting column 414 to be in threaded connection with the connecting column 414. Specifically, the inner surface of the protrusion 3111 is provided with an internal thread corresponding to an external thread on the screw of one of the bolts 444, the connecting column 414 is provided with a threaded connector (not shown), and the inner surface of the threaded connector is provided with an internal thread corresponding to an external thread on the screw of the other bolt 444. In this embodiment, considering that the connection post 414 is made of plastic and is difficult to thread, and therefore a threaded connection is provided, it will be appreciated that in other embodiments not shown, when the connection post 414 is made of other insulating materials, the connection post 414 may be directly threaded, and the threaded connection may be omitted. It is understood that in other embodiments not shown, the heating element 44 and the connecting member 41 can be fixed relative to each other by two positioning pins (not shown). The heating element 44 is fixed to the connecting member 41 by the bolts 444, so that it is convenient to remove and replace the heating element 44.
In this embodiment, the heating element 44 is a heating sheet, and the specific structure is the same as that of the first embodiment, which is not described herein again.
In the present embodiment, the liquid guiding member 43 directly communicates with the liquid outlet hole 413 to adsorb the tobacco juice in the liquid storage chamber 101. The heating element 44 may be in contact with at least a portion of the liquid guiding member 43 to heat the liquid smoke adsorbed on the liquid guiding member 43, as long as the liquid guiding member 43 is ensured to be able to adsorb the liquid smoke in the liquid storage chamber 101. It is understood that in other embodiments, not shown, the heating element 44 may be located between the liquid outlet hole 413 and the liquid guiding member 43, and the liquid smoke in the liquid storage cavity 101 passes through the liquid outlet hole 313, the liquid outlet hole 413 and the through groove on the heating element 44 in sequence and is adsorbed by the liquid guiding member 43. The arrangement of the through groove can ensure that even if the tobacco juice flows to the heating element 44 first, the tobacco juice can be absorbed by the liquid guiding piece 43 in time, so as to prevent the heating element 44 from being soaked by the tobacco juice.
In the present embodiment, the connecting seat 45 is an electrical conductor, and may be made of a metal or an alloy material with good electrical conductivity, for example. The connecting seat 45 is a hollow structure with an opening at the upper end, the lower end of the mounting seat 42 is accommodated in the inner cavity of the connecting seat 45, a connecting block 452 for connecting with a battery device is formed by downwardly protruding the lower end surface of the connecting seat 45 along the axial direction of the connecting seat 45, and the connecting block 452 is communicated with the inner cavity of the connecting seat 45. In the present embodiment, a sealing ring 453 is disposed outside the upper end of the mounting seat 42, and the sealing ring 453 is made of rubber, silicon, or the like, so that the sealing ring 453 seals a gap between the protruding portion 312 and the mounting seat 42, and connection sealing performance and connection stability are improved.
The atomizing assembly 40 further includes a first electrode contact 46 disposed in the interior cavity of the connecting block 452, a second electrode contact 47 disposed on top of the first electrode contact 46, and a third electrode contact 48 disposed on the second electrode contact 47. The top end of the first electrode contact 46 penetrates through the mounting seat 42 and extends to the lower side of the liquid guiding member 43, the second electrode contact 47 is sleeved outside the top end of the first electrode contact 46, the third electrode contact 48 is sleeved on the second electrode contact 47 and abuts against the inner wall of the mounting seat 42, and one end of the third electrode contact 48 extends to the lower side of the connecting column 414.
In this embodiment, the atomizing assembly 40 further includes a limiting block 49 for abutting against the third electrode contact member 48 and an insulating member 461 located between the inner surface of the connecting block 452 and the outer surface of the first electrode contact member 46, one end of the limiting block 49 abuts against the mounting seat 42, the other end of the limiting block 49 abuts against one end of the third electrode contact member 48 extending to the lower side of the connecting column 414, the limiting block 49 is made of a material with good elasticity, such as rubber, silica gel, and the like, and by providing the limiting block 49, a abutting force is provided to the third electrode contact member 48, so that the third electrode contact member 48 is more stably sleeved on the second electrode contact member 47, and the end extending outward of the third electrode contact member 48 is supported, and the end is prevented from being deformed and contacting with the heating element 44 after being used for a long time. In the present embodiment, the insulating member 461 is made of an insulating material such as rubber or silicone.
The base 50 is an electrical conductor, and is made of a metal or alloy material with good electrical conductivity, for example, in this embodiment, the base 50 is a hollow structure with openings at both ends, the connecting seat 45 is detachably accommodated in the inner cavity of the base 50, and the connecting block 452 passes through the lower end opening of the base 50 and then extends out of the base 50. The inner peripheral wall of base 50 is threaded to threadedly engage with projection 312, although in other embodiments not shown, base 50 may be removably engaged with projection 312 by snapping, plugging, etc.
In the present embodiment, the power supply device is connected to the connection block 452 by a screw thread, so that the atomizer 100 atomizes the smoke liquid into smoke under the electric driving action of the power supply device, and the smoke passes through the smoke outlet pipe 32 and then enters the mouth of the user through the cigarette holder 28.
The installation process comprises the following steps: installing a limiting seat 24 on the top of the liquid storage part 10, installing a communicating part 21 on the limiting seat 24, installing a moving part 22 on the communicating part 21, sleeving a decorative cover 23 on the moving part 22, inserting a cigarette holder 28 in the air vent 221, and sleeving an air adjusting part 29 outside the communicating part 21; the air inlet pipe 31 is connected with the second connecting pipe 215, and the smoke outlet pipe 32 is connected with the third connecting pipe 217; connecting the connecting piece 41 with the limiting part 311, so that the protrusion 3111 is inserted into the connecting hole 412, the connecting column 414 is inserted into the through hole 3112, the screw of one bolt 444 passes through one of the mounting holes of the heating element 44 and then extends into the protrusion 3111 to be in threaded connection with the protrusion 3111, and the screw of the other bolt 444 passes through the other mounting hole of the heating element 44 and then extends into the connecting column 414 to be in threaded connection with the connecting column 414, thereby fixing the heating element 44; a first electrode contact element 46 is arranged in a connecting block 452 in a penetrating manner, a mounting seat 42 is mounted on a connecting seat 45, the top end of the first electrode contact element 46 penetrates through an opening at the bottom end of the mounting seat 42 and then extends into the mounting seat 42, a second electrode contact element 47 is in threaded connection with the top end of the first electrode contact element 46, a third electrode contact element 48 is sleeved on the second electrode contact element 47 and abuts against the inner wall of the mounting seat 42, a limiting block 49 is clamped between the third electrode contact element 48 and the mounting seat 42, an insulating element 461 is clamped between the first electrode contact element 46 and the connecting block 452, a sealing ring 453 is sleeved outside the mounting seat 42, the connecting seat 45 is mounted in an inner cavity of the base 50, and the connecting block 452 penetrates through an opening at the lower end of the base 50 and then extends out of the base 50, so that the first electrode contact element 46, the second electrode contact element 47, the third electrode contact element 48, The mounting seat 42, the limiting block 49, the sealing ring 453 and the base 50 together form a connecting device (not shown); the liquid guiding member 43 is placed in the receiving groove 421, when the connecting means is connected to the protrusion 312, specifically, when the base 50 is connected to the protrusion 312, the liquid guiding member 43 is in contact with the heating element 44, and since the aperture of the electrode hole of the third electrode contact 48 is larger than the diameter of the end of the bolt 444, the third electrode contact 48 can pass through the end of the bolt 444 and then be in contact with the heating element 44; the battery device is threaded into the connection block 452 such that the positive electrode of the battery device is electrically connected to the first electrode contact 46 and the negative electrode of the battery device is electrically connected to the base 50, thereby electrically connecting the atomizer 100 to the battery device. Because the base 50 and the mounting seat 42 are not relatively fixed, when the base 50 is connected with the protruding portion 312, the mounting seat 42 does not rotate along with the base 50, so that the liquid guiding member 43 does not rotate along with the base 50, and in the installation process, the liquid guiding member 43 does not rotate relative to the heating element 44, so that the final installation direction of the liquid guiding member 43 can be ensured to meet the requirements of users, and the abrasion caused by the friction between the liquid guiding member 43 and the heating element 44 due to the rotation can be avoided.
The use process comprises the following steps: when a user fills liquid, the decorative cover 23 is pushed to drive the movable piece 22 to slide, and when the liquid filling port 212 is at least partially opened by the movable piece 22, the user can fill smoke liquid into the liquid storage cavity 101 through the liquid filling port 212; after the liquid injection is finished, the decorative cover 23 is pushed to drive the movable piece 22 to slide until the movable piece 22 closes the liquid injection port 212; when a user uses the electronic cigarette, the electronic cigarette is started, one end of the heating element 44 is electrically connected with the positive electrode of the battery device sequentially through the third electrode contact 48, the second electrode contact 47 and the first electrode contact 46, the other end of the heating element 44 is electrically connected with the negative electrode of the battery device sequentially through the air inlet pipe 31, the base 50 and the connecting seat 45, so that the battery device can provide electric energy for the heating element 44, smoke liquid in the liquid storage cavity 101 permeates to the liquid guide member 43 through the lower liquid hole 313 and the liquid outlet hole 413, the liquid guide member 43 starts to heat smoke liquid on the liquid guide member 43 under electric drive while gradually absorbing the smoke liquid, so as to form smoke, under the suction action of the user, external air enters the ventilation groove 216 through the communication part of the air inlet 211 and the air adjusting port 291 and then flows to the upper surface of the heating element 44 through the air inlet channel 314, after being mixed with the smoke, the mixed smoke flows out through the smoke outlet channel 321, the communication port 218, the air vent 221 and the cigarette holder 28 in sequence and is finally sucked by a user; when adjusting air, a user rotates the air adjusting piece 29 to enable the air adjusting piece 29 to rotate relative to the communicating piece 21, when the air adjusting port 291 is at least partially communicated with the air inlet 211, external air enters the air inlet pipe 31 through a communicating part between the air adjusting port 291 and the air inlet 211, so that the user can adjust the communicating area between the air adjusting port 291 and the air inlet 211 by rotating the air adjusting piece 29 according to the requirement of the user, further adjust the air inflow of the external air entering the atomizing assembly 40, and improve the use experience of the user; when the heating element 44 needs to be replaced, the connecting device is separated from the atomizer body, that is, the threaded connection between the base 50 and the protruding part 312 is released, so that the heating element 44 can be exposed, and then, the user can replace the heating element 44 by respectively detaching the bolt 444 extending into the protrusion 3111 and in threaded connection with the protrusion 3111 and the bolt 444 extending into the connecting column 414 and in threaded connection with the connecting column 414; when the liquid guiding member 43 needs to be replaced, the connecting device is separated from the atomizer body, that is, the threaded connection between the base 50 and the protruding portion 312 is released, so that the liquid guiding member 43 is exposed, the liquid guiding member 43 placed in the accommodating groove 421 is taken out, and a new liquid guiding member 43 is replaced.
The electronic cigarette has the beneficial effects that: in the atomizer 100 or the electronic cigarette provided in this embodiment, the heating element 44 is disposed at one end of the atomizer 100 body, the connecting device is detachably connected to the end of the atomizer body where the heating element 44 is disposed, the connecting device includes the mounting seat 42, the mounting seat 42 is provided with the receiving groove 421, the liquid guiding member 43 is detachably received in the receiving groove 421, when the connecting device is connected to the end of the atomizer body where the heating element 44 is disposed, at least a portion of the liquid guiding member 43 contacts with the heating element 44, and the liquid storage cavity 101 is communicated with the liquid guiding member 43. Therefore, the user can detach the connecting device and replace the liquid guide 43 accommodated in the accommodating groove 421; the atomizer 100 or the electronic cigarette provided by the embodiment can replace the liquid guiding piece 43 independently, and the liquid guiding piece 43 is convenient and quick to replace.
In addition, the heat generating element 44 has through grooves 443 spaced apart from the heat generating portion 441, and the through grooves 443 are disposed to facilitate the outflow of smoke, and to increase the resistance of the heat generating portion 441, thereby facilitating the resistance heating; the heating part 441 is further provided with a protective layer, a plurality of micron-nanometer-scale mastoids are formed on the surface of the protective layer, so that an interface structure with alternate concave and convex is formed on the surface of the protective layer, the concave surfaces among the mastoids can absorb gas molecules and enable the gas molecules to stably exist, a stable gas film is further formed on the surface of the protective layer, water/oil cannot directly contact with the surface of the protective layer, the surface of the protective layer presents hydrophobic and oleophobic characteristics, carbide generated by smoke liquid and liquid guide parts at high temperature is prevented from being deposited on the heating part 441, and the service life of the heating element 44 is prolonged.
Experimental example 1
The first experimental example provides a heating element, in the first experimental example, the connecting part and the heating part of the heating element are both made of stainless steel, and the material of the protective layer is silicate ceramic.
The method for manufacturing the heating element of this experimental example includes the steps of:
1) carrying out chemical etching on a heating part of the heating element to obtain at least two through grooves which are arranged at intervals, wherein a partition wall is reserved in each through groove, and each through groove is divided into a first through groove and a second through groove;
2) placing the heating element in an ultrasonic cleaning machine filled with ethanol solution for ultrasonic cleaning to remove impurities, oil stains and the like on the surface of the heating element, and drying for later use after cleaning;
3) carrying out sand blasting treatment on the surface of the heating part to clean and coarsen the surface of the heating part, wherein the spraying material subjected to sand blasting treatment is carborundum with the specification of No. 60-80;
4) blowing floating sand and dust on the surface of the heating element by using compressed air, preheating the heating element for 5min at 60 ℃, clamping a connecting part by using a clamp, spraying ceramic paint and a coloring agent on the heating part by using spraying equipment to form a protective layer, cleaning a spray gun of the spraying equipment by using isopropanol and butanone before use, wherein the ceramic paint is a suspension liquid formed by nano silicate particles and ethanol, and the coloring agent is iron oxide;
5) and (3) walking the sprayed heating element to level the coating so as to uniformly distribute the protective layer, and then sintering at 160 ℃ for 10min to obtain the coating.
EDS (scanning Electron microscope spectrometer) test was performed on the heat generating part of the heat generating element in the first experimental example, and the results are shown in FIG. 7, i.e., a layer, b layer, c layer, d layer and e layer, respectively, from top to bottom, wherein the a layer represents the sample stage, the b layer represents the protective layer on the upper surface of the heat generating part, the c layer represents the heat generating part, the d layer represents the protective layer on the lower surface of the heat generating part, and the e layer represents the sample stage, wherein the results of analyzing the element contents at the regions 1-5 in FIG. 7 are shown in Table 1,
TABLE 1 elemental composition and analysis results of the content (%), in the region shown by 1-5 in FIG. 7
Region(s) C O Si Cl Cr Mn Fe Cu
1 24.95 41.19 13.18 0.06 3.53 2.85 12.68 1.57
2 24.26 39.98 11.64 0.08 4.57 2.89 14.35 2.24
3 25.25 40.73 13.07 0.05 4.14 2.51 11.98 2.27
4 27.83 40.22 12.57 0.07 2.85 2.58 13.01 0.87
5 38.97 35.32 9.36 0.16 3.18 1.48 10.19 1.34
As can be seen from the data in table 1, the protective layer has a high content of silicon and oxygen, indicating that the ceramic coating was successfully sprayed on the heat-generating part, and the protective layer has a high content of iron, and the heat-generating part appears black when observed by the naked eye, indicating that the colorant was successfully sprayed on the heat-generating part. In addition, the detection results showed that a small amount of other metal elements were contained in addition to iron, because the heat generating part was made of stainless steel, and a small portion of the electron beam might be irradiated onto the heat generating part body when the EDS test was performed, so that a small amount of other metal elements were contained.
SEM tests were performed on the connection portion and the heat generating portion of the heat generating element in the first experimental example, and the test magnifications were the same, and as a result, as shown in fig. 8 and 9, fig. 8 is an SEM image of the connection portion, fig. 9 is an SEM image of the heat generating portion, and it can be seen from comparison between fig. 8 and 9 that the surface of the connection portion has no protective layer and is relatively smooth; the surface of the heating part with the protective layer on the surface is rough, a plurality of micron-nanometer mastoids are formed on the surface of the protective layer, so that an interface structure with alternate concave and convex is formed on the surface of the protective layer, the low concave surface between the mastoids can absorb gas molecules and enable the gas molecules to stably exist, a stable gas film is further formed on the surface of the coating, water/oil cannot directly contact with the surface of the protective layer, the surface of the protective layer presents hydrophobic and oleophobic characteristics, carbide generated by burning smoke liquid and liquid guide parts at high temperature is prevented from being deposited on the heating part, and the service life of the heating element is prolonged.
SEM test of the cross section of the heating part of the heating element in the first experimental example is carried out, and the result is shown in FIG. 10, wherein in FIG. 10, from top to bottom, the layer a represents the sample stage, the layer b represents the protective layer on the upper surface of the heating part, the layer c represents the heating part, the layer d represents the protective layer on the lower surface of the heating part, and the layer e represents the sample stage, the thickness of the protective layer b on the upper surface is 27.68-32.79 μm, the thickness of the protective layer d on the lower surface is 13.11-16.03 μm, and the thickness of the heating part c is 145-165 μm. When the protective layer is sprayed, the protective layer b (corresponding to the protective layer on the upper surface in fig. 10) formed on the side of the heat generating portion facing the spray gun is thick, and the protective layer d (corresponding to the protective layer on the lower surface in fig. 10) formed on the side away from the spray gun is thin. The thickness of the protective layers on the two sides of the heating part is different, but a user does not need to distinguish, and both sides can be used. In order to ensure the consistency of the performances of the two sides, spraying can be carried out on the two sides so that the thicknesses of the protective layers on the two sides are consistent.
Experimental example two
The present experimental example provides a heating element having the same structure as that of the heating element in the first experimental example, except that in the first experimental example, the connecting portion and the heating portion are both made of a nickel-chromium alloy, and the protective layer is made of aluminum nitride.
In this experimental example, the thickness of the connecting portion and the thickness of the heat generating portion were both 165 μm.
In this experimental example, the length of the connecting portion is 4.5mm, the length of the heat generating portion is 10.5mm, the width of the through groove is 0.6mm, and the length of the through groove is 10.5 mm. The resistance of the heating element in this experimental example was 0.5 to 0.8 Ω.
The method for manufacturing the heating element of this experimental example includes the steps of:
1) carrying out chemical etching on a heating part of the heating element to obtain at least two through grooves which are arranged at intervals, wherein a partition wall is reserved in each through groove, and each through groove is divided into a first through groove and a second through groove;
2) placing the heating element in an ultrasonic cleaning machine filled with acetone solution for ultrasonic cleaning to remove impurities, oil stains and the like on the surface of the heating element, and drying for later use after cleaning;
3) the surface of the heating part is subjected to thread turning treatment to coarsen the surface of the heating part, so that the surface of the heating part obtains certain roughness, the mechanical property of the surface of the heating part is improved, the coarsened surface can be mutually embedded with ceramic paint, a subsequent protective layer and the heating part can be favorably combined by forming a mechanical bond, the adhesive force between the surface of the heating part and the protective layer is increased, and a plurality of uniformly distributed micron-nanometer mastoids can be favorably formed on the surface of the protective layer;
4) blowing off dust on the surface of the heating element by using compressed air, preheating the heating element at 80 ℃ for 5min, clamping the connecting part by using a clamp, and depositing a ceramic coating on the heating part by using a physical vapor deposition method to form a protective layer; the ceramic coating is mainly formed by mixing aluminum nitride, an ethanol solvent and a phenolic aldehyde amine curing agent;
5) sintering the heating element at 200 deg.C for 10 min.
Experimental example III
The present experimental example provides a heating element having the same structure as that of the heating element of the first experimental example except that the connecting portion and the heating portion are made of a titanium alloy and the protective layer is made of a mixture of yttria and zirconia.
In this experimental example, the thickness of the connecting portion and the thickness of the heat generating portion were 150 μm.
In this experimental example, the length of the connecting portion is 3.5mm, the length of the heat generating portion is 9.5mm, the width of the through groove is 0.5mm, and the length of the through groove is 9.5 mm. The resistance of the heating element in this experimental example was 0.8 to 1.0 Ω.
The preparation method of the heating element comprises the following steps:
1) carrying out chemical etching on a heating part of the heating element to obtain at least two through grooves which are arranged at intervals, wherein a partition wall is reserved in each through groove, and each through groove is divided into a first through groove and a second through groove;
2) placing the heating element in an ultrasonic cleaning machine filled with acetone solution for ultrasonic cleaning to remove impurities, oil stains and the like on the surface of the heating element, and drying for later use after cleaning;
3) the surface of the heating part is roughened to coarsen the surface of the heating part, so that the surface of the heating part obtains certain roughness, the mechanical property of the surface of the heating part is improved, the adhesive force between the surface of the heating part and the protective layer is increased, and a plurality of uniformly distributed micron-nanometer mastoids are formed on the surface of the protective layer;
4) blowing off dust on the surface of the heating element by using compressed air, preheating the heating element at 70 ℃ for 8min, clamping the connecting part by using a clamp, and spraying ceramic paint on the heating part by plasma spraying to form a protective layer; the ceramic coating is formed by mixing yttrium oxide and zirconium oxide;
5) and uniformly distributing the protective layer on the sprayed heating element in a rotating, vibrating and other modes, and then sintering at 180 ℃ for 12min to obtain the coating.
In other embodiments of the present invention, the protective layer may be made of silicon carbide, silicon nitride, or aluminum oxide.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.

Claims (10)

1. The utility model provides a heating element for atomizer or electron cigarette of electron cigarette, its characterized in that, including the portion of generating heat, with two connecting portions that the portion of generating heat is connected and set up and be in protective layer on the portion of generating heat, the portion of generating heat with two connecting portions all have electric conductivity, the protective layer has insulating nature, two connecting portions with the different parts of the portion of generating heat contact, just two connecting portion intervals set up, the portion of generating heat is gone up the interval and is equipped with two at least logical grooves, during the use, aerosol formation substrate with the protective layer contacts, the protective layer is established at intervals aerosol formation substrate with between the portion of generating heat, the heat that the portion of generating heat produced under the electric drive passes through the protective layer is passed on for aerosol formation substrate.
2. The heating element of claim 1 wherein said protective layer is a ceramic layer.
3. The heat-generating component according to claim 1, wherein the heat-generating component is a heat-generating sheet, the through groove penetrates through upper and lower surfaces of the heat-generating portion, and the protective layer is disposed on at least one of the upper and lower surfaces of the heat-generating portion and avoids a notch of the through groove.
4. The heating element according to claim 3, wherein the two connecting portions are symmetrically disposed at opposite ends of the heating portion, and the through grooves at the two ends of the heating portion and the connecting portions and the adjacent two through grooves are connected by connecting sections.
5. The heating element of claim 4 wherein a partition is disposed within each of said through slots, said partition dividing each of said through slots into a first through slot and a second through slot.
6. An atomizer, its characterized in that, the atomizer includes atomizer main part, heating element and leads liquid spare, be provided with the stock solution chamber in the atomizer main part, heating element sets up the one end of atomizer main part, the stock solution chamber with lead liquid spare intercommunication, heating element include the portion of generating heat, with two connecting portion that the portion of generating heat is connected and set up the inoxidizing coating on the portion of generating heat, the portion of generating heat with two connecting portion all have electric conductivity, the inoxidizing coating has insulating properties, two connecting portion with the different parts of the portion of generating heat contact, and two connecting portion intervals set up, the portion of generating heat is gone up the interval and is equipped with two at least logical grooves, lead liquid spare with the inoxidizing coating contact sets up, during the use, lead liquid spare absorption the tobacco juice in the stock solution chamber, the heat transfer that the portion of generating heat produced under the electric drive gives the inoxidizing coating, the protective layer heats the tobacco juice adsorbed on the liquid guide piece.
7. The atomizer of claim 6, further comprising a connecting device, wherein the connecting device is detachably connected to an end of the atomizer body where the heating element is disposed, the connecting device comprises a mounting seat, the mounting seat is provided with an accommodating groove, and the liquid guide member is detachably accommodated in the accommodating groove.
8. A nebulizer as claimed in claim 6, wherein the protective layer is a ceramic layer.
9. The atomizer of claim 6, wherein said heat generating element is a heat generating plate, said heat generating portion has at least two through slots spaced apart from each other, said through slots penetrate through upper and lower surfaces of said heat generating portion, said shielding layer is disposed on at least one of said upper and lower surfaces of said heat generating portion, and said shielding layer avoids notches of said through slots.
10. An electronic cigarette, characterized in that the electronic cigarette comprises a power supply device and an atomizer according to any one of claims 6-9, the atomizer being electrically connected to the power supply device.
CN201811303525.7A 2018-11-02 2018-11-02 Heating element, atomizer and electronic cigarette Active CN111134372B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112056637A (en) * 2020-09-27 2020-12-11 云南中烟工业有限责任公司 Testing device for resistance temperature coefficient of heating body of electronic cigarette and using method thereof
CN112315028A (en) * 2020-10-28 2021-02-05 深圳美众联科技有限公司 Atomizer and electronic smoking set
CN113080529A (en) * 2021-04-30 2021-07-09 深圳羽制科技有限公司 Colored ceramic atomizing core, preparation method and electronic cigarette
JP7081772B1 (en) 2021-12-14 2022-06-07 寧波依蘭雅絲護膚品有限公司 Electronic atomizer to prevent liquid leakage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105852216A (en) * 2016-05-23 2016-08-17 深圳市新宜康科技有限公司 Atomizing core of electronic cigarette using metal screen nets as liquid guide medium
CN206043440U (en) * 2016-08-30 2017-03-29 卓尔悦欧洲控股有限公司 Atomising head, nebulizer and its electronic cigarette
US20180020736A1 (en) * 2016-07-25 2018-01-25 Patrick Charles SILVESTRINI Cartridge for an aerosol-generating system with heater protection
CN108272136A (en) * 2018-01-13 2018-07-13 深圳市新宜康电子技术有限公司 Self-adjustable intelligence atomization core and preparation method thereof
CN108451044A (en) * 2018-04-26 2018-08-28 株洲利德英可电子科技有限公司 A kind of chip electronic cigarette heater and preparation method thereof and electronic cigarette

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105852216A (en) * 2016-05-23 2016-08-17 深圳市新宜康科技有限公司 Atomizing core of electronic cigarette using metal screen nets as liquid guide medium
US20180020736A1 (en) * 2016-07-25 2018-01-25 Patrick Charles SILVESTRINI Cartridge for an aerosol-generating system with heater protection
CN206043440U (en) * 2016-08-30 2017-03-29 卓尔悦欧洲控股有限公司 Atomising head, nebulizer and its electronic cigarette
CN108272136A (en) * 2018-01-13 2018-07-13 深圳市新宜康电子技术有限公司 Self-adjustable intelligence atomization core and preparation method thereof
CN108451044A (en) * 2018-04-26 2018-08-28 株洲利德英可电子科技有限公司 A kind of chip electronic cigarette heater and preparation method thereof and electronic cigarette

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112056637A (en) * 2020-09-27 2020-12-11 云南中烟工业有限责任公司 Testing device for resistance temperature coefficient of heating body of electronic cigarette and using method thereof
CN112315028A (en) * 2020-10-28 2021-02-05 深圳美众联科技有限公司 Atomizer and electronic smoking set
CN113080529A (en) * 2021-04-30 2021-07-09 深圳羽制科技有限公司 Colored ceramic atomizing core, preparation method and electronic cigarette
JP7081772B1 (en) 2021-12-14 2022-06-07 寧波依蘭雅絲護膚品有限公司 Electronic atomizer to prevent liquid leakage
JP2023088231A (en) * 2021-12-14 2023-06-26 寧波依蘭雅絲護膚品有限公司 Electronic atomizer preventing liquid leakage

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