CN115462566A - Anti-dry burning ceramic heating body and its preparation method and aerosol generating device - Google Patents

Abstract

The invention belongs to the field of electronic atomizers, and particularly discloses an anti-dry-burning ceramic heating body and a preparation method thereof as well as an aerosol generating device, wherein the anti-dry-burning ceramic heating body comprises a ceramic substrate and a heating film, the heating film is arranged on the outer surface of the ceramic substrate, a positive film thermocouple and a negative film thermocouple are arranged on the heating film, and the film thermocouple comprises a first hot electrode and a second hot electrode electrically connected with the first hot electrode; the film thermocouple can measure the temperature of the heating film quickly and accurately, and has good firmness and durability.

Description

Anti-dry burning ceramic heating body and its preparation method and aerosol generating device

technical field

The invention belongs to the field of electronic atomizers, and in particular relates to an anti-dry burning ceramic heating body and a preparation method thereof.

Background technique

At present, the atomization core of the atomization device used in the field of atomization technology is usually composed of a ceramic substrate and a heating wire to form a ceramic heating body. After the aerosol matrix flows into the ceramic substrate, it is heated and atomized by the heating wire. When the aerosol When the matrix is about to be used up, or when the aerosol matrix is sucked back, the ceramic heating body will dry-burn. The existing technical scheme adopts the method of detecting resistance to prevent dry-burning, and utilizes a large TCR (temperature coefficient of resistance) with obvious temperature effect ) heating material as a means of temperature measurement, when the temperature of the heating material rises, the resistance changes significantly, and the chip is used to detect the resistance value of the line and switch the circuit to prevent dry burning from overheating. In the oil-free state, the temperature rises sharply and the resistance changes. The resistance module in the power management system detects that the resistance value changes exceed the predetermined value and the number of times, and stops heating. However, the prior art needs to use a heating material with a large TCR, and there are many restrictions on the heating material. The TCR of the heating material nickel-chromium alloy with stronger durability and stability cannot meet the requirements and cannot be used; and the ceramic heating body mainly has steel There are two types of embedded ceramic cores and thick film printed ceramic cores. The TCR of steel sheet heating is relatively stable, while the TCR of thick film printed heating materials is not stable enough due to the large difference in material technology, and the stability of anti-dry burning cannot be guaranteed. .

Contents of the invention

The object of the present invention is to provide a dry-burning-proof ceramic heating body with good reliability and durability, a preparation method thereof and an aerosol generating device.

In order to achieve the above object, the present invention is achieved through the following technical solutions: provide an anti-dry ceramic heating body, including a ceramic base and a heating film, the heating film is arranged on the outer surface of the ceramic base, the heating A thin-film thermocouple is provided on the membrane, and the thin-film thermocouple includes a first thermal electrode and a second thermal electrode electrically connected to the first thermal electrode.

Further, the materials of the first thermal electrode and the second thermal electrode are nickel-chromium alloy and nickel-silicon alloy, or platinum-ruthenium alloy and platinum, or indium tin oxide and indium oxide, respectively.

Further, both ends of the heating film are provided with wiring pads, and the thickness of the thin-film thermocouple is 2-10 μm.

Further, the lower end of the ceramic substrate is provided with a hollow groove.

Also provided is a preparation method of the anti-dry burning ceramic heating body as described above, comprising the following steps:

S1. Punch holes at the design position of the ceramic heating body printed with the heating film;

S2. Ultrasonic cleaning is performed on the ceramic heating body that has been drilled;

S3, drying the cleaned ceramic heating body;

S4. Carry out a mask on the dried ceramic heating body, put it on the base platform in the magnetron sputtering furnace, perform surface decontamination, and then sputter the first thermode and the second thermode;

S5. Remove the mask in S5, and respectively connect compensation wires to the first thermal electrode and the second thermal electrode to complete the entire preparation process of the anti-dry burning ceramic heating body.

Further, the diameter of the hole punched in the S1 is 0.5mm-0.7mm, and the hole depth is 0.5mm-1mm.

Further, in S2, the ceramic heating body is placed in absolute ethanol and deionized water for ultrasonic cleaning in sequence, and the cleaning time is 5-10 minutes.

Further, in the S3, the ceramic heating body is dried in a blast drying oven at 150° C., and the drying time is 1-2 hours.

Further, in S4, the vacuum of the magnetron sputtering furnace is 0.83Pa, the sputtering power is 300W, the base temperature is 200-300°C, and the sputtering time is 60-120 minutes.

Also provided is an aerosol generating device, which includes the above-mentioned anti-dry ceramic heating body, and also includes a temperature control module and a power control module electrically connected to the temperature control module, and the thin film thermocouple is connected to the temperature control module. Control module electrical connection.

The present invention has the following beneficial effects:

The anti-dry burning ceramic heating body of the embodiment of the present invention is equipped with a thin-film thermocouple, and the temperature of the heating film can be measured in real time through the thin-film thermocouple, which realizes the integration of structure and function. The ceramic heating body works in the atomization cabin. When the aerosol matrix in the atomization chamber is about to be used up, or when the aerosol matrix in the atomization chamber is sucked back, the heating film continues to work, which can cause the ceramic heating body to heat up rapidly. The thin film thermocouple located at the upper end of the ceramic heating body It can detect the signal of temperature rise and finally stop the heating of the heating film, effectively preventing the ceramic heating body from overheating and dry burning; the thin-film thermocouple can quickly and accurately measure the temperature of the heating film, with good reliability, and the thin-film thermoelectric The coupler is directly placed on the surface of the ceramic base, which does not affect the thickness of the overall structure, does not affect the airflow path in the atomizer, does not generate airflow disturbance, and has good durability.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings on the premise of not paying creative work.

Fig. 1 is the schematic diagram of the anti-dry burning ceramic heating body that the embodiment of the present invention provides;

Fig. 2 is a schematic diagram of another angle of the anti-dry-burning ceramic heating body provided by the embodiment of the present invention;

Fig. 3 is a top view of the anti-dry burning ceramic heating body provided by the embodiment of the present invention.

Instructions for identification in the figure:

1. Ceramic substrate; 2. Heating film; 3. Thin film thermocouple; 11. Main body; 12. Flange; 13. Groove; 21. Circuit pad; 31. First thermal electrode; 32. Second thermal electrode; 33. The first pad; 34. The second pad.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and/or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and/or collections thereof.

It should also be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the present invention. As used in this specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural referents unless the context clearly dictates otherwise.

It should also be further understood that the term "and/or" used in the description of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations .

Example 1

Please refer to Figures 1-3, the anti-dry-burning ceramic heating body provided in this embodiment includes a ceramic base 1 and a heating film 2. The ceramic base 1 includes a main body 11 and a flange 12 protruding from the upper end of the main body 11 to generate heat. The membrane 2 is arranged on the top of the flange 12 , and a thin-film thermocouple 3 is arranged on the heat-generating membrane 2 . The thin-film thermocouple 3 includes a first thermal electrode 31 and a second thermal electrode 32 electrically connected to the first thermal electrode 31 .

Through the above structure, in practical application, the anti-dry burning ceramic heating body shown in this embodiment has its own thin-film thermocouple 3, and the temperature measurement of the heating film 2 can be carried out through the thin-film thermocouple 3, realizing the integration of structure and function , the ceramic heating body works in the atomization chamber (not shown in the figure), when the aerosol matrix in the atomization chamber is about to run out, or when the aerosol matrix in the atomization chamber is sucked back, the heating film 2 is still Continuous work can cause the ceramic substrate 1 to heat up rapidly. The thin-film thermocouple 3 located on the upper end of the ceramic substrate 1 transmits the signal to the external control management system and cuts off the power supply, which effectively prevents the over-temperature dry burning of the ceramic heating body. The thermocouple 3 can quickly and accurately measure the temperature of the heating film 2, and has good reliability.

Further, the materials of the first thermal electrode 31 and the second thermal electrode 32 can be nickel-chromium alloy and nickel-silicon alloy, or platinum-ruthenium alloy and platinum, or indium tin oxide and indium oxide, in this embodiment, for From the perspective of cost considerations, the materials of the first thermal electrode 31 and the second thermal electrode 32 are selected to be nickel-chromium alloy and nickel-silicon alloy respectively.

Further, the thickness of the thin-film thermocouple 3 is 2-10 μm, so that the thin-film thermocouple 3 is integrated with the surface of the ceramic substrate 1, and the structural size is thin, which does not affect the airflow path in the atomizer, and does not generate airflow disturbance. It is easy to install and use, does not require a special space and method for fixing the sensor, has excellent durability, and also has the advantages of fast response, high accuracy and good reliability, and can realize mass production.

As a preferred embodiment, referring to FIG. 2 , a hollow groove 13 is provided at the lower end of the main body 11 , and the groove 13 can accelerate the speed of oil conduction.

In this embodiment, both ends of the heating film 2 are provided with circuit pads 21, and external wires (not shown in the figure) can be electrically connected to the heating film 2 at the line pads 21; and the ends of the second thermal electrode 32 are respectively provided with a first solder pad 33 and a second solder pad 34, and on the first solder pad 33 and the second solder pad 34, the first thermal electrode 31 and the second thermal electrode 32 can be respectively Connect the compensation wire (not shown in the figure), so that an external temperature control module can be connected.

Example 2

This embodiment provides a method for preparing the anti-dry burning ceramic heating body as described in Embodiment 1, comprising the following steps:

S1. Punch a hole at the design position of the ceramic heating body printed with the heating film, the hole diameter of the hole is 0.5mm-0.7mm, and the hole depth is 0.5mm-1mm;

S2. The ceramic heating body that has been drilled is placed in absolute ethanol and deionized water for ultrasonic cleaning, and the ultrasonic cleaning time of the ceramic heating body in absolute ethanol and deionized water is 5-10 minutes;

S3. Dry the cleaned ceramic heating body in a blast drying oven. The temperature in the blast drying oven is 150° C., and the drying time of the ceramic heating body in the blast drying oven is 1-2 hours.

S4, select the material of the first thermal electrode to be NiCr, cover the area that does not need to sputter NiCr on the dried ceramic heating body, then put it on the base platform in the magnetron sputtering furnace, and evacuate to The background vacuum is 4*10-4Pa, then close the ionized silicon unit, open the argon main valve, open the argon pressure reducing valve until the argon outlet pressure is 0.2-0.25MPa, adjust the flow rate to a vacuum of 0.83Pa, and turn on the sputtering power supply , starting pre-sputtering for 1 minute, decontaminating the surface of the NiCr sputtering target, then opening the baffle of the NiCr sputtering target, adjusting the sputtering power to 300W, the base temperature to 200-300°C, and the sputtering time Sputtering for 60-120 minutes. After sputtering, turn off the sputtering power supply, turn off the heating, and turn off the argon gas. After the base in the magnetron sputtering furnace cools down naturally to below 100°C, open the furnace door and take out the ceramic heating body. ;

S5, select the material of the second thermal electrode as NiSi, remove the mask on the ceramic heating body in step S4, cover the area that does not need to be sputtered with NiSi, ensure that the exposed part overlaps with the NiCr joint, and then put Put it on the base table in the magnetron sputtering furnace, evacuate to the background vacuum of 4*10-4Pa, then close the ionized silicon unit, open the argon main valve, and open the argon pressure reducing valve until the argon outlet pressure is 0.2- 0.25MPa, adjust the flow rate to a vacuum of 0.83Pa, turn on the sputtering power supply, start the pre-sputtering for 1 minute, decontaminate the surface of the NiSi sputtering target, and then open the baffle of the NiSi sputtering target to adjust the sputtering The power is 300W, the base temperature is 200-300°C, and the sputtering time is 90-180 minutes. After sputtering, turn off the sputtering power supply, turn off the heating, turn off the argon gas, and wait for the base in the magnetron sputtering furnace. Naturally cool down to below 100°C, open the furnace door and take out the ceramic heating body;

S6, remove the mask on the ceramic heating body in S5, use the conductive silver paste cured at low temperature as the connecting material, connect the compensation wires respectively on the first thermal electrode and the second thermal electrode, and complete the preparation of the whole anti-dry ceramic heating body process.

S7. Put the anti-dry burning ceramic heating body into a 120-300°C atmospheric furnace or a drying box and solidify the conductive silver paste;

S8. Place the anti-dry-burning ceramic heating body in a constant temperature field, read the temperature with a temperature measuring instrument, and then combine the thermocouple index to obtain the output thermoelectric potential, and calibrate its temperature measurement accuracy.

The temperature of the measured nickel-chromium-nickel-silicon thin-film thermocouple—the measured data of thermoelectric potential are as follows:

temperature °C Thermoelectric potential mV 100 3.08 200 7.55 300 12.10 400 16.37 500 20.48

The temperature of the heating film under different thermoelectric potentials can be obtained through the measured data of temperature-thermoelectric potential. When the temperature rises, the corresponding thermoelectric potential will also rise. When the temperature rises to a certain value, it can be managed through external control The system cuts off the working power of the heating film and makes it stop working, thus achieving the purpose of preventing the ceramic heating body from overheating and dry burning.

Compared with the prior art, the present application installs a thin-film thermocouple on the ceramic heating body, and the real-time temperature measurement of the heating film can be carried out through the thin-film thermocouple, which realizes the integration of structure and function, and effectively prevents the ceramic heating body from overheating and dryness. Burning; the thin film thermocouple can quickly and accurately measure the temperature of the heating film, which has good reliability, and the thin film thermocouple is directly installed on the surface of the ceramic substrate, which does not affect the thickness of the overall structure and does not affect the airflow in the atomizer Path, no airflow disturbance, good durability.

Example 3

This embodiment provides an aerosol generating device, including the anti-dry-burning ceramic heating body as described in Embodiment 1, and also includes a temperature control module and a power control module electrically connected to the temperature control module, a thin-film thermocouple and a temperature control module. The control module is electrically connected, and the power control module is used to control the power on and off of the whole device.

Through the above structure, in actual application, when the aerosol matrix in the atomization chamber is about to be used up, or when the aerosol matrix in the atomization chamber is sucked back, the heating film 2 continues to work, which can cause the ceramic substrate 1 The temperature rises rapidly, and the thin-film thermocouple 3 located on the upper end of the ceramic substrate 1 transmits the signal to the temperature control module. The super-temperature dry burning of the body.

The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalents within the technical scope disclosed in the present invention. Modifications or replacements shall all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. The utility model provides a prevent dry combustion method ceramic heating body which characterized in that, includes the ceramic base member and is used for heating the collective heating film of pottery, the heating film is located on the surface of ceramic base member, be equipped with the thin film thermocouple who is used for the temperature measurement on the heating film, the thin film thermocouple include first thermode and with the second thermode that first thermode electricity is connected.

2. The dry-heating prevention ceramic heating body according to claim 1, wherein the materials of the first hot electrode and the second hot electrode are nichrome and nickel-silicon alloy, or platinum-ruthenium alloy and platinum, or indium-tin oxide and indium oxide, respectively.

3. The dry burning prevention ceramic heater according to claim 2, wherein the thin film thermocouple has a thickness of 2 to 10 μm.

4. The dry-burning preventing ceramic heater as set forth in claim 3, wherein the ceramic base has a hollow recess formed at a lower end thereof.

5. A method for preparing a dry-fire proof ceramic heater as defined in any one of claims 1 to 4, comprising the steps of:

s1, punching holes at the design positions of the ceramic heating bodies printed with the heating films;

s2, ultrasonically cleaning the ceramic heating body after the hole is punched;

s3, drying the cleaned ceramic heating body;

s4, performing mask shielding on the dried ceramic heating body, placing the ceramic heating body on a base station in a magnetron sputtering furnace, performing surface decontamination, and sputtering a first hot electrode and a second hot electrode;

and S5, removing the mask in the step S5, and respectively connecting compensation leads to the first hot electrode and the second hot electrode to finish the whole preparation process of the dry-burning-resistant ceramic heating body.

6. The method for producing a dry-burning preventing ceramic heater according to claim 5, wherein the hole punched in S1 has a hole diameter of 0.5mm to 0.7mm and a hole depth of 0.5mm to 1mm.

7. The method for manufacturing a ceramic heating body for preventing dry burning according to claim 6, wherein in the step S2, the ceramic heating body is sequentially placed in absolute ethyl alcohol and deionized water for ultrasonic cleaning, and the cleaning time is 5-10 minutes.

8. The method for producing a ceramic heating body for preventing dry heating according to claim 7, wherein in the step S3, the ceramic heating body is dried in a forced air drying oven at 150 ℃ for 1 to 2 hours.

9. The method for producing a ceramic heater for preventing dry burning according to claim 8, wherein in S4, the magnetron sputtering furnace is set to have a vacuum of 0.83Pa, a sputtering power of 300W, a base temperature of 200 to 300 ℃, and a sputtering time of 60 to 120 minutes.

10. An aerosol generating device comprising the dry-fire resistant ceramic heating body according to any one of claims 1 to 4, further comprising a temperature control module and a power control module electrically connected to the temperature control module, wherein the thin film thermocouple is electrically connected to the temperature control module.

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