CN110677936A - Ceramic heating body - Google Patents
Ceramic heating body Download PDFInfo
- Publication number
- CN110677936A CN110677936A CN201910798466.3A CN201910798466A CN110677936A CN 110677936 A CN110677936 A CN 110677936A CN 201910798466 A CN201910798466 A CN 201910798466A CN 110677936 A CN110677936 A CN 110677936A
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- ceramic
- core rod
- heating
- circuit
- heat
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/02—Details
- H05B3/06—Heater elements structurally combined with coupling elements or holders
Abstract
The invention provides a ceramic heating body for electronic cigarettes, which comprises: the ceramic core rod is provided with a heating circuit on the surface, a ceramic heat conduction layer is arranged outside the ceramic core rod and the heating circuit, and the heat conductivity of the ceramic heat conduction layer is greater than that of the ceramic core rod; the heating circuit is formed by coating the whole surface by adopting a vacuum magnetron sputtering process and then etching the circuit by laser. The ceramic core rod and the heating circuit are sputtered with a layer of ceramic heat conduction layer, the heat conductivity of the ceramic heat conduction layer is larger than that of the ceramic core rod, the heat distribution on the surface of the ceramic heating body is balanced to a certain degree, and the surface temperature of the ceramic heating body is uniform; only one ceramic heat conduction layer is arranged above the heating electrode and needs to be heated, so that the temperature rise speed can be greatly increased; meanwhile, the existence of the heat conducting layer reduces the requirement on the heat conductivity of the ceramic core rod, so that the ceramic core rod can be made of a low-heat-conductivity material, the heat is reduced from being transferred to the end part through the ceramic core rod, and the temperature of a welding wire area can be reduced.
Description
Technical Field
The invention relates to the technical field of electronic cigarettes, in particular to a ceramic heating body.
Background
The low-temperature baking electronic cigarette has the advantages of no combustion, no generation of toxic substances such as carbon monoxide and the like, and is rapidly developed in the global scope in recent years; the ceramic heating body is used as a core component of the electronic cigarette, and the overall design and performance quality level of the electronic cigarette are determined. The ceramic heating body of the electronic cigarette on the market at present is divided into three categories, namely tubular, sheet and needle according to the difference of the appearance, is mainly made of alumina or zirconia ceramic, and is matched with tungsten slurry, molybdenum slurry, platinum slurry, gold slurry and the like which are sintered at high temperature to be used as electrode materials.
The early products are mainly made of alumina, but because the thermal conductivity of the alumina is high (the thermal conductivity is 25-36W/m.K), the heat is quickly conducted to a non-heating area, so that the defects of low heating speed, high power consumption, overhigh temperature of a bottom welding line position and the like exist; in order to solve the problems of overhigh temperature and the like of the position of a welding line at the bottom of a part of products, structures such as a heat insulation flange plate are arranged, so that the structure is complicated, the appearance is not attractive, and the cost is increased.
In addition, in the prior art, zirconia materials are adopted for product manufacturing, the thermal conductivity of the commonly used 3Y zirconia is about 2.09W/m.K, and is obviously reduced compared with alumina, so that the problems of slow temperature rise, high power consumption and high temperature of a welding line area of the alumina material product can be effectively solved; but also brings about the situation that the temperature distribution on the surface of the heating body is very uneven.
The aluminum oxide and zirconium oxide materials need to be sintered at a high temperature of more than 1400 ℃, the high-temperature electrode slurry which can be used together with the aluminum oxide and zirconium oxide materials mainly comprises tungsten slurry, gold slurry, platinum slurry and the like, but the tungsten slurry needs to be sintered in an inert atmosphere or a reducing atmosphere, and the requirements on the process are high; platinum paste, gold paste, etc. can be sintered in an oxidizing atmosphere, but the material itself is expensive.
Meanwhile, the heating needle made of aluminum oxide has the defects of low heating speed (the temperature rises to 350 ℃ in 8-10 seconds), high welding area temperature (higher than 100 ℃) and high power consumption, and the temperature difference of the surface of the product is large (the temperature difference is 20-40 ℃ within 10 seconds); the heating needle is made of zirconia ceramics, so that the temperature rise speed of the product can be increased (the temperature rises to 350 ℃ in about 5 seconds), the temperature of a welding line area of the product is reduced (less than 100 ℃), but the temperature difference of the product is increased (the temperature difference is more than 50 ℃ within 10 seconds); the mixture of alumina and zirconia has little influence on the thermal conductivity, and the problem cannot be solved.
In summary, a needle-shaped heating body with a fast temperature rise, a small surface temperature difference and a low bonding wire area temperature is lacked in the prior art.
Disclosure of Invention
The invention provides a ceramic heating body for an electronic cigarette, aiming at solving the problem that a needle-shaped heating body which is high in heating speed, small in surface temperature difference and low in welding line area temperature is lacked in the prior art.
In order to solve the above problems, the technical solution adopted by the present invention is as follows:
a ceramic heating body comprising: the ceramic core rod is provided with a heating circuit on the surface, a ceramic heat conduction layer is arranged outside the ceramic core rod and the heating circuit, and the heat conductivity of the ceramic heat conduction layer is greater than that of the ceramic core rod; the heating circuit is formed by coating the whole surface by adopting a vacuum magnetron sputtering process and then etching the circuit by laser.
In some embodiments of the invention, the following features are also provided:
the ceramic heat conduction layer is high heat conduction insulating ceramic of aluminum nitride or silicon nitride.
The ceramic heat conducting layer is formed by vacuum coating on the surfaces of the ceramic core rod and the heating circuit through a vacuum magnetron sputtering coating process.
The ceramic core rod comprises a ceramic core rod, and is characterized by further comprising a temperature measuring circuit, wherein the temperature measuring circuit and the heating circuit are arranged on the surface of the ceramic core rod.
The temperature measuring circuit and the heating circuit are formed on the surface of the ceramic core rod together in a sputtering and laser etching mode.
The core rod is a rod with a columnar body and a tip part, so that the ceramic heating body for the electronic cigarette is axially and sequentially provided with the tip part, a heating part and an end part, and the cross section of the heating part is circular, oval or round-corner rectangular.
The end part is provided with an electrode pad, and the electrode pad is connected with an electrode lead.
The ceramic core rod is a ceramic material with high bending strength and low thermal conductivity, the bending strength is more than or equal to 250MPa, and the thermal conductivity is less than or equal to 5.0W/m.K.
The heating circuit is a resistance heating circuit which is arranged in a reciprocating and back-folding way.
The ceramic core rod is formed by sintering a ceramic green body manufactured by injection molding or molding at high temperature.
The invention has the beneficial effects that: providing a ceramic heating body, sputtering a heating circuit on the surface of the ceramic core rod, arranging a heat conduction layer with the heat conductivity larger than that of the ceramic core rod, and only arranging a ceramic heat conduction layer above the heating electrode, so that the temperature rise speed can be greatly increased; meanwhile, the existence of the heat conducting layer reduces the requirement on the heat conductivity of the ceramic core rod, so that the ceramic core rod can be made of a low-heat-conductivity material, and the heat is reduced from being transferred to the end part through the ceramic core rod, thereby reducing the temperature of a welding wire area and the power consumption of a product.
Drawings
FIG. 1 is a plan development view of a ceramic heater for an electronic cigarette in an embodiment of the present invention.
FIG. 2 is an appearance schematic diagram of a ceramic heating body for an electronic cigarette in an embodiment of the invention.
FIG. 3 is a schematic cross-sectional view of a ceramic heater for an electronic cigarette in an embodiment of the invention.
The ceramic core rod comprises 1-a ceramic core rod, 2-a heating circuit, 3-a temperature measuring circuit, 4-a heat conducting layer, 5-a tip part, 6-a heating part and 7-an end part.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for either a fixing function or a circuit connection function.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "surface," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Example 1
The electronic cigarette ceramic heating body mainly comprises three types of tubular, sheet and needle, is mainly made of alumina or zirconia ceramic, and is matched with high-temperature sintered tungsten slurry, platinum slurry, gold slurry and the like as electrode materials. Most of the aluminum oxide and the tungsten used as an electrode material have the main problems that: firstly, tungsten needs to be sintered under reducing atmosphere, secondly, the thermal conductivity of aluminium oxide is high, and the heat passes through the porcelain body and spreads to the zone of heating outward during the heating, leads to the rear end weld zone temperature of heating member to rise, and not only heat loss seriously still can lead to other devices to generate heat, so need increase the flange ring of low heat conduction and stop thermal diffusion, can make the heater structure become complicated, the cost increase.
Furthermore, the ceramic heating body of the electronic cigarette is generally heated rapidly by a heating circuit, and the set temperature is required to be reached within 5-10 seconds, so that the problem of uneven heating part temperature of the heating body exists. The uneven temperature can cause the insufficient baking of some parts of the electronic cigarette and the insufficient amount of smoke; and some parts are baked too much to generate burnt flavor, which affects the taste of smoking and generates a plurality of substances harmful to human body.
As shown in fig. 1, it is a schematic expansion diagram of a ceramic core rod, a heating circuit, a temperature measuring circuit and a heat conducting layer; the invention provides a ceramic heating body for electronic cigarettes, which comprises: the ceramic core rod 1 is characterized in that a heating circuit 2 and a temperature measuring circuit 3 are sputtered on the surface of the ceramic core rod 1, a heat conducting layer 4 is sputtered on the surfaces of the ceramic core rod 1, the heating circuit 2 and the temperature measuring circuit 3, and the heat conductivity of the heat conducting layer 4 is larger than that of the ceramic core rod 1.
In another embodiment of the invention, the thermometry circuit 3 may be absent. When the ceramic heating body comprises the temperature measuring circuit 3, the temperature measuring circuit 3 and the heating circuit 2 are sputtered on the upper part of the columnar body through the whole surface at the same time, and then the heating circuit and the temperature measuring circuit are respectively formed through a laser etching mode.
As shown in fig. 2, the appearance of the ceramic heating body is schematically shown, and the ceramic heating body comprises a tip part 5, a heat emitting part 6 and an end part 7. The end portion 7 is provided with an electrode pad to which an electrode lead is connected.
Because the heating circuit 2 is a resistance heating circuit which is arranged in a reciprocating and reversing way, and in a specific embodiment, the heating circuit is a resistance heating circuit which is arranged in a U-shaped reciprocating way, the temperature of a place with the heating circuit is high, the temperature of a place without the heating circuit is low, the surface of the ceramic core rod has great temperature difference and poor temperature uniformity; aiming at the condition of uneven surface temperature of the heating body, the invention adopts the way that the surface of the heating area of the heating body is added with the heat conduction layer of the high-heat-conductivity ceramic, so that the heat distribution on the surface of the heating body can be balanced to a certain extent, and the surface temperature difference of the heating body is reduced.
Although the high thermal conductivity of the heat conducting layer helps to quickly spread and homogenize the heat generated by the heating circuit, the homogenization effect is related to the thickness of the heat conducting layer, the thicker the thickness is, the better the homogenization effect is, and the smaller the temperature difference of the surface of the heating body is; in the patent, the ceramic heat conduction layer is manufactured in a vacuum sputtering mode, and the thickness of the ceramic heat conduction layer is determined to be relatively small, so that the effect of heat balance is difficult to achieve and can be relieved only to a certain extent; the thickness of the vacuum sputtering heat conduction layer is generally 1-3 um, and the temperature difference on the surface of the heater can reach 20-50 ℃.
In the invention, the ceramic heat conduction layer is made of ceramic materials such as aluminum nitride or silicon nitride and the like, and the ceramic heat conduction layer has the advantages of only conducting heat and electricity and not needing to manufacture an insulation layer to protect the heat conduction layer. The method comprises the following steps: and manufacturing a heat conducting layer on the surface of the ceramic core rod of which the heating circuit and the temperature measuring circuit are manufactured by sputtering and laser etching. The heat conducting layer is a compact ceramic layer, and sintering and insulation layer manufacturing are not needed to protect the heat conducting layer.
The ceramic core rod adopts a high-strength ceramic material with low thermal conductivity, namely, a material with low thermal conductivity is adopted to overcome the defects of low heating speed, high power consumption, overhigh temperature of a bottom welding line position and the like; meanwhile, the problem of uneven distribution of temperature in a short time is relieved by adopting the heat conduction layer.
The ceramic core rod material has high bending strength and low heat conductivity coefficient (heat conductivity coefficient is less than or equal to 5.0)
W/m.k, bending strength greater than 250MPa), the following advantages exist when the ceramic material is used for manufacturing the heating body:
(1) the core rod has high strength, can meet the requirements of the heating body in use, and is not easy to break.
(2) Because the ceramic core rod material has low heat conductivity, the heat is reduced by diffusion of the ceramic body, so that the product has the obvious advantages of higher heating rate, lower power consumption, low temperature of welding spot positions and the like.
As shown in fig. 2, in one embodiment, a needle-shaped ceramic heating body is used, the ceramic core rod is a rod with a columnar body and a tip, the heating circuit 2 is sputtered on the surface of the columnar body through the whole surface, and then a heating line, a bonding pad and the like are formed through a laser etching method, so that the ceramic heating body for the electronic cigarette is axially and sequentially provided with the tip 5, a heating part 6 and an end part 7, and the cross section of the ceramic core rod is circular, oval or rectangular with round corners; the electrode lead arranged at the end part can adopt low-temperature welding, so that the process is simpler.
As shown in fig. 3, the ceramic heating body of the present invention comprises an inner core rod 1, a heating circuit 2, a temperature measuring circuit 3 and a heat conducting layer 4, wherein a heating layer, a temperature measuring layer and a heat conducting layer are respectively formed after winding and forming, wherein the heating layer and the heat conducting layer are respectively formed as one layer on the heating body, and the temperature measuring layer can be combined with the heating layer as one layer or can be separately arranged as an integral layer; the heating circuit is indispensable, and temperature measurement circuit and heat-conducting layer can be deleted according to the different demands of product. The printed ceramic substrate has at least 1 layer and at most 3 layers of functional layers that can be wound when the ceramic substrate is wound on an inner mandrel depending on the composition of the pattern.
The ceramic core rod is prepared by mixing organic adhesive (such as acrylic resin, thermoplastic resin such as PVA, PVB, paraffin wax and the like), ceramic powder, a plasticizer, a dispersant, a release agent and the like into ceramic mud, preparing into a ceramic green body by adopting methods such as injection molding or molding and the like, and sintering at high temperature.
The heating speed of the heating body manufactured by the method can reach 350 ℃ within 2-3 seconds under the same heating power; and (3) keeping the temperature for 10 seconds after the thickness is 1-3 um according to the thickness difference of the heat conduction layer, wherein the surface temperature difference of the heater is 20-50 ℃.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several equivalent substitutions or obvious modifications can be made without departing from the spirit of the invention, and all the properties or uses are considered to be within the scope of the invention.
Claims (10)
1. A ceramic heating body, characterized in that it comprises: the ceramic core rod is provided with a heating circuit on the surface, a ceramic heat conduction layer is arranged outside the ceramic core rod and the heating circuit, and the heat conductivity of the ceramic heat conduction layer is greater than that of the ceramic core rod; the heating circuit is formed by coating the whole surface by adopting a vacuum magnetron sputtering process and then etching the circuit by laser.
2. The ceramic heater according to claim 1, wherein the ceramic heat conductive layer is a high heat conductive insulating ceramic of the aluminum nitride or silicon nitride type.
3. The ceramic heater of claim 2, wherein the ceramic heat conductive layer is formed by vacuum deposition on the surface of the ceramic core rod and the heating circuit by a vacuum magnetron sputtering deposition process.
4. The ceramic heater according to claim 1, further comprising a temperature measuring circuit, wherein the temperature measuring circuit and the heating circuit are provided on the surface of the ceramic core rod.
5. The ceramic heater according to claim 5, wherein the temperature measuring circuit and the heating circuit are formed on the surface of the ceramic core rod by sputtering or laser etching.
6. The ceramic heating body as set forth in claim 1, wherein the core rod is a rod having a columnar body and a tip portion, so that the ceramic heating body for electronic cigarette is axially provided with the tip portion, the heating portion and the end portion in this order, and the cross-sectional shape of the heating portion is circular, oval or rectangular with rounded corners.
7. The ceramic heater according to claim 7, wherein the end portion is provided with an electrode pad to which an electrode lead is connected.
8. The ceramic heater of claim 1, wherein the ceramic core rod is an LTCC ceramic material with high bending strength and low thermal conductivity, the bending strength is greater than or equal to 250MPa, and the thermal conductivity is less than or equal to 5.0W/m.k.
9. The ceramic heater of claim 1, wherein the heater trace is a resistance heater circuit in a reciprocating serpentine arrangement.
10. The ceramic heater of claim 1, wherein the ceramic core rod is formed by sintering a ceramic green body formed by injection molding or molding at a high temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910798466.3A CN110677936A (en) | 2019-08-27 | 2019-08-27 | Ceramic heating body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910798466.3A CN110677936A (en) | 2019-08-27 | 2019-08-27 | Ceramic heating body |
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| Publication Number | Publication Date |
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| CN110677936A true CN110677936A (en) | 2020-01-10 |
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| CN201910798466.3A Pending CN110677936A (en) | 2019-08-27 | 2019-08-27 | Ceramic heating body |
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| CN109953380A (en) * | 2019-03-20 | 2019-07-02 | 河南中烟工业有限责任公司 | A kind of heating is not burnt with heating rod and production method and a kind of electronic cigarette |
| CN110167221A (en) * | 2019-04-29 | 2019-08-23 | 中研香诚(北京)科技有限公司 | A kind of ceramic heating flake and preparation method thereof |
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| CN206851054U (en) * | 2016-12-30 | 2018-01-05 | 李伟 | A kind of ceramic heating element with heat dissipating layer |
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Application publication date: 20200110 |
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