阅读说明：本技术 一种陶瓷加热体 (Ceramic heating body ) 是由 占湘湘 戴春雷 伍检灿 于 2019-08-27 设计创作，主要内容包括：本发明提供一种电子烟用陶瓷加热体,包括：陶瓷芯棒,在所述陶瓷芯棒的表面设置有加热电路,在所述陶瓷芯棒和加热电路外设置有陶瓷导热层,所述陶瓷导热层的导热率大于所述陶瓷芯棒的导热率；所述加热电路是采用真空磁控溅射工艺整面镀膜然后再激光蚀刻线路而成型的。通过在陶瓷芯棒和加热电路外溅射一层陶瓷导热层,陶瓷导热层的导热率大于陶瓷芯棒的导热率,在一定程度上平衡陶瓷加热体表面的热分布,使陶瓷加热体表面温度均匀；加热电极上方仅有一层陶瓷导热层需要进行加热,可以大幅提升升温速度；同时,导热层的存在降低了对陶瓷芯棒热导率的要求,使其可采用低热导率材料,减少热量通过陶瓷芯棒向端部传递,从而可以降低焊线区温度。(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.)

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.

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.