CN113455715A

CN113455715A - Aerosol generating device and heating assembly thereof

Info

Publication number: CN113455715A
Application number: CN202110757620.XA
Authority: CN
Inventors: 黄鹏飞; 方日明; 张幸福
Original assignee: Shenzhen Maishi Technology Co Ltd
Current assignee: Shenzhen Maishi Technology Co Ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-10-01

Abstract

The invention relates to an aerosol generating device and a heating assembly thereof, wherein the heating assembly comprises a base body, a heating track arranged on the base body and two electrodes respectively connected to two ends of the heating track; the heating trace includes a first resistive line made of a first resistive material and a second resistive line made of a second resistive material and connected to the first resistive line, the first resistive material and the second resistive material being different. When the heating assembly is electrified, the first resistance circuit and the second resistance circuit are used as heating elements to generate heat; when the power supply is stopped, the first resistance circuit and the second resistance circuit are used as thermocouple temperature measuring sensors to measure the temperature of the heating assembly, so that the heating and temperature measuring functions are realized.

Description

Aerosol generating device and heating assembly thereof

Technical Field

The invention relates to the field of atomization, in particular to an aerosol generating device and a heating assembly thereof.

Background

The heating non-combustion type atomizing device is an aerosol generating device which heats atomizing materials to form inhalable aerosol in a low-temperature heating non-combustion mode, wherein how to detect and control the temperature of a heating assembly is a key problem of the device. The heating component of the existing non-combustion heating type atomizing device is directly arranged on a heating resistance wire or is additionally provided with a temperature measuring thermocouple at a position close to the heating resistance wire, and temperature measurement is realized through the thermocouple. Because the thermocouple is closer to the heater, the heating element is easy to generate short circuit, the manufacturing process of the heating element is complex, and in addition, the heating circuit and the temperature measuring circuit are separately designed, and the circuit is complex.

Disclosure of Invention

The present invention provides a heating assembly with heating and temperature measuring functions and an aerosol generating device with the heating assembly, aiming at the above-mentioned defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a heating assembly, which comprises a base body, a heating track arranged on the base body and two electrodes respectively connected to two ends of the heating track; the heating trace includes a first resistive line made of a first resistive material and a second resistive line made of a second resistive material and connected to the first resistive line, the first resistive material and the second resistive material being different.

In some embodiments, the base includes a tube, and the heat generating track is disposed within the tube.

In some embodiments, the heating assembly further comprises a support disposed within the tube for positioning the heating trace.

In some embodiments, the first resistance line is spirally wound outside the stent along the axial direction, and the upper end of the second resistance line is connected with the upper end of the first resistance line to form a whole.

In some embodiments, the stent is tubular and the second resistive wire is linear or helical and disposed within the stent.

In some embodiments, the second resistor circuit is linear and disposed outside the bracket, or the second resistor circuit is spiral and wound outside the bracket.

In some embodiments, the tube is made of metal, and the heating assembly further includes an insulating layer disposed between the tube and the heat generating trace.

In some embodiments, the insulating layer comprises a ceramic or thermally conductive paste.

In some embodiments, the connection points of the two electrodes to the first and second resistive lines are located within the tube and at the bottom of the tube.

In some embodiments, the height of the connection point of the two electrodes with the first and second resistive lines from the bottom surface of the substrate is at least 1/10-1/8 of the height of the substrate.

In some embodiments, the heating assembly further comprises a susceptor in which a lower end of the base is inserted.

In some embodiments, the top surface of the base is located below or flush with the lower end surface of the connection point of the two electrodes to the first and second resistive lines.

In some embodiments, the base is made of ceramic, and the outer surface of the base and the base are sintered or welded into a whole.

In some embodiments, the two electrodes are connected to lower ends of the first and second resistive lines, respectively.

In some embodiments, the two electrodes are both wire electrodes.

In some embodiments, the resistance of the electrode is less than the resistance of the first and second resistive lines.

In some embodiments, the first and second resistive lines have a resistance of 0.5 to 1 ohm, and the electrodes have a resistance of 0.05 to 0.3 ohm.

In some embodiments, the first resistive wire and the second resistive wire are metal wires made of two materials or alloy wires made of two different materials, or one of the first resistive wire and the second resistive wire is a metal wire and the other is an alloy wire.

In some embodiments, one of the first and second resistive traces is a platinum-rhodium alloy wire and the other is a platinum wire, or one of the first and second resistive traces is a nichrome wire and the other is a nickel-silicon alloy wire.

In some embodiments, the outer surface of the substrate is provided with a protective layer comprising a ceramic layer or a glass glaze layer.

The invention also provides an aerosol generating device comprising a heating assembly as described in any of the above.

The implementation of the invention has at least the following beneficial effects: when the heating assembly is electrified, the first resistance circuit and the second resistance circuit are used as heating elements to generate heat; when the power supply is stopped, the first resistance circuit and the second resistance circuit are used as thermocouple temperature measuring sensors to measure the temperature of the heating assembly, so that the heating and temperature measuring functions are realized.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic perspective view of an aerosol generating device according to some embodiments of the present invention;

FIG. 2 is a schematic cross-sectional view of the aerosol generating device of FIG. 1;

FIG. 3 is a schematic perspective view of the heating assembly of FIG. 2;

FIG. 4 is an exploded view of the heating assembly of FIG. 3;

FIG. 5 is a cross-sectional view of the heating element shown in FIG. 3 with the insulating layer hidden;

FIG. 6 is an exploded schematic view of a first alternative of the heating assembly shown in FIG. 3;

FIG. 7 is an exploded schematic view of a second alternative of the heating assembly shown in FIG. 3;

fig. 8 is a schematic cross-sectional view of a third alternative of the heating element shown in fig. 3 after an insulating layer is hidden.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1-2 illustrate an aerosol-generating device 100 according to some embodiments of the invention, the aerosol-generating device 100 being usable for low-temperature bake heating of an aerosol-generating substrate inserted therein to release an aerosol extract from the aerosol-generating substrate in a non-combustible state. The aerosol-generating substrate may be a cylindrical solid substrate of plant foliage type, and as shown, the aerosol-generating device 100 may be generally square and cylindrical, with the top of the aerosol-generating device 100 being provided with a socket 20 of a shape and size to fit the aerosol-generating substrate. It is to be understood that the aerosol generating device 100 is not limited to a square cylinder, but may have other shapes such as a cylinder, an elliptic cylinder, and the like.

The aerosol generating device 100 may include a housing 2, and a heating assembly 1, an extraction tube 5, a main board 3, and a battery 4 disposed in the housing 2. The inner wall surface of the extraction tube 5 defines a receiving space 50 for receiving an aerosol-generating substrate, which is insertable into the receiving space 50 via the socket 20. The upper end of the heating element 1 may extend into the receiving space 50 and be inserted into the aerosol-generating substrate in close contact therewith. After the heating assembly 1 is electrified and heated, heat can be transferred to the aerosol generating substrate, so that the aerosol generating substrate is baked and heated. The mainboard 3 is respectively electrically connected with the battery 4 and the heating assembly 1. The main board 3 is provided with a related control circuit, and the switch 7 arranged on the shell 2 can be used for controlling the connection and disconnection between the battery 4 and the heating component 1. The top of the housing 2 may be provided with a dust cover 6 for covering or uncovering the socket 20. When the aerosol generating device 100 is not required to be used, the dust cap 6 can be pushed to shield the socket 20, so as to prevent dust from entering the socket 20. When required for use, the dust cap 6 is pushed to expose the socket 20 so that the aerosol generating substrate is inserted from the socket 20.

Fig. 3 to 5 show a heating element 1 according to a first embodiment of the present invention, and the heating element 1 may include a substrate 11, a heat emitting trace 12 disposed on the substrate 11, and two electrodes 16 electrically connected to two ends of the heat emitting trace 12. The heat generating trace 12 includes a first resistive line 121 made of a first resistive material and a second resistive line 122 made of a second resistive material and connected to the first resistive line 121. The first resistance material and the second resistance material are two different resistance materials. The first resistance line 121 and the second resistance line 122 are connected and integrated near the top of the base 11. It is understood that in other embodiments, the heat generating trace 12 may be formed by connecting three or more resistance lines made of different resistance materials.

The substrate 11 may be made of a high temperature resistant alloy or a metal material, such as stainless steel. The base body 11 made of metal has good heat conductivity and low overall heat loss. The outer surface of the substrate 11 may also be provided with a protective layer having insulating and protective functions, such as a ceramic coating or a glass glaze layer. In this embodiment, the substrate 11 may be immersed in a glass frit and then sintered and cured to form a glaze layer protective layer. On one hand, the protective layer can isolate the substrate 11 from the outside air and can also make the outer surface of the substrate 11 smooth, so that the aerosol generating substrate is prevented from bonding or corroding the substrate 11, and the substrate 11 is convenient to scrub; on the other hand, the insulating function of the protective layer can ensure better insulation between the surface of the substrate 11 and the heat generating traces 12 and the electrodes 16.

The base 11 may include a tube 111 and an introduction part 112 disposed at an upper end of the tube 111 in some embodiments. The introduction portion 112 has formed thereon a guide formation for facilitating insertion into an aerosol-generating substrate into which the substrate 11 may be inserted via the introduction portion 112 at its upper end. The tube 111 may be a circular tube, and the introduction part 112 may be a circular cone and may be integrally formed with the tube 111. In other embodiments, the inlet 112 and the tube 111 may be separately manufactured and then assembled together. In other embodiments, the cross-sectional profile of the tube 111 can be oval, square, rectangular, or other shapes. It will be appreciated that in other embodiments, the substrate 11 may also be a sheet-like structure, a rod-like structure, or a cup-like structure.

The heating trace 12 is disposed in the tube 111, and the heating trace 12 is used for generating heat after being electrified to heat the aerosol generating substrate, and can be made of a conductive material with higher resistivity and more heat generation. The heating assembly 1 may further include a holder 14 disposed in the tube 111 for holding the heating trace 12. In this embodiment, the support 14 is in the form of a hollow circular tube, which may be made of a high temperature resistant insulating material such as ceramic. The first resistance line 121 is a spiral resistance wire, and may include a first spiral section 1212 spirally wound outside the holder 14 along the axial direction, and a first straight section 1211 and a second straight section 1213 connected to the lower end and the upper end of the first spiral section 1212, respectively. The second resistance line 122 is a linear resistance wire, the second resistance line 122 is disposed in the bracket 14 and can be located at the central axis of the first spiral section 1212, and the upper end of the second resistance line 122 can be connected to the second linear section 1213 by welding or the like, so that the second resistance line 122 and the first resistance line 121 are integrated. The support 14 may be made of a ceramic material with high thermal conductivity, which is beneficial to make the temperature generated by the first resistance line 121 and the second resistance line 122 at the same level along the axial direction uniform.

The first resistance line 121 and the second resistance line 122 may be made of two different metal wires or two different alloy wires, or one of the first resistance line 121 and the second resistance line 122 may be made of a metal wire and the other may be made of an alloy wire. The resistance ranges of the first resistance line 121 and the second resistance line 122 may be 0.5-1 ohm. In some embodiments, one of the first resistance line 121 and the second resistance line 122 is made of platinum-rhodium alloy wire, and the other is made of platinum wire; or, one of the first resistance line 121 and the second resistance line 122 is made of a nichrome wire, and the other one is made of a nickel-silicon alloy wire; alternatively, one of the first resistance line 121 and the second resistance line 122 is made of nichrome wire, and the other is made of nickel-silicon wire.

The upper ends of the two electrodes 16 can be respectively connected with the lower ends of the first resistance circuit 121 and the second resistance circuit 122 in a welding or riveting mode, and the lower ends of the two electrodes 16 are in conductive connection with a control circuit of the aerosol generating device. The resistance of the electrode 16 is much smaller than the resistances of the first and

second resistance lines

121 and 122. The electrode 16 may be formed from a wire electrode having a relatively low resistivity and low heat generation. In some embodiments, the electrodes 16 may be aluminum or silver wires. The resistance of the electrode 16 may be 0.05-0.3 ohms.

The connection point 126 between the two electrodes 16 and the first resistive circuit 121 and the second resistive circuit 122 can be located in the tube 111 and at the bottom of the tube 111, so as to ensure that the first resistive circuit 121 and the second resistive circuit 122 are both located in the tube 111 completely, thereby preventing the first resistive circuit 121 and the second resistive circuit 122 from generating heat loss outside the tube 111. Further, the height H1 of the connection point 126 of the two electrodes 16 with the first resistance line 121 and the second resistance line 122 from the bottom surface of the substrate 11 is at least 1/10-1/8 of the height H0 of the substrate 11 to ensure that the temperature field for heating the portion of the aerosol-generating substrate located above the connection point 126 is high for the substrate 11.

The substrate 11 may be further filled with an insulating layer 15, and the insulating layer 15 covers the bracket 14 and the heat-generating trace 12 to insulate and isolate the heat-generating trace 12 from the substrate 11. In addition, the insulating layer 15 can fix the heating trace 12 and fill the gap between the heating trace 12 and the substrate 11, which is beneficial to heat conduction. In some embodiments, the insulating layer 15 may be a ceramic with good thermal conductivity, such as an aluminum silicate ceramic, or a high temperature resistant thermally conductive paste. In addition, in other embodiments, the outer surface of the heat generating trace 12 may be formed with an insulating layer by dipping or spraying, so as to realize insulation between the heat generating trace 12 and the base 11.

The heating assembly 1 may further comprise a base 13 for securing the substrate 11 within the housing 2. The lower end of the base body 11 is inserted on the base 13, and the base 13 is further connected with a mounting seat in the housing 2, thereby fixing the heating assembly 1 in the housing 2. The top surface of the base 13 is located below the connection point 126 between the two electrodes 16 and the first and

second resistance lines

121, 122 or is flush with the lower end surface of the connection point 126, so that the base 13 can be kept away from the first and

second resistance lines

121, 122 with high resistance and high heating temperature as far as possible, and the mount is prevented from being damaged by high temperature. The base 13 may be made of ceramic, and the outer surface of the base 11 may be sintered or welded to the base 13. In other embodiments, the base 13 may be made of a high temperature resistant material such as PEEK (polyetheretherketone).

When the heating assembly 1 is powered on in use, the first resistance line 121 and the second resistance line 122 are used as heating elements to generate heat; when the power supply is stopped, the first resistance line 121 and the second resistance line 122 are used as thermocouple temperature measuring sensors to measure the temperature of the heating assembly 1, so that the heating and temperature measuring functions are realized. Compare with current heating element and reduced temperature measurement sensor, simplified heating element's manufacturing process, improved heating element's performance, promoted the stoving effect to aerosol production base member, reduction in production cost brings better use experience for the consumer.

Fig. 6 shows a heating assembly 1 according to a first alternative of the present invention, which mainly differs from the first embodiment in that the second resistance line 122 in this embodiment is a linear resistance wire and is disposed outside the support 14, and in this case, the support 14 can be made of a ceramic material with high thermal conductivity or a ceramic material with poor thermal conductivity. In addition, in the present embodiment, the bracket 14 may have a solid round bar shape or a hollow round tube shape, and the outer side surface of the bracket 14 may further be recessed to form a groove 140 for accommodating the second resistance line 122.

Fig. 7 shows a heating assembly 1 in a second alternative of the present invention, which mainly differs from the first embodiment in that the second resistance line 122 in this embodiment is a helical resistance wire and is wound outside the support 14. The second resistive line 122 may include a third straight line segment 1221 at a lower end for connecting with the electrode 16, and a second spiral segment 1222 connected with an upper end of the third straight line segment 1221 and spirally wound on the support 14, wherein the second spiral segment 1222 of the second resistive line 122 and the first spiral segment 1212 of the first resistive line 121 are spaced apart from each other. In this embodiment, the support 14 may be in the shape of a solid round rod or a hollow round tube, and the support 14 may be made of a ceramic material with high thermal conductivity or a ceramic material with poor thermal conductivity.

Fig. 8 shows a heating assembly 1 according to a third alternative of the invention, which differs from the first embodiment mainly in that the second resistance line 122 in this embodiment is a helical resistance wire and is wound around the inside of the holder 14. In this embodiment, the support 14 may be made of a ceramic material with high thermal conductivity, which is beneficial to make the temperature generated by the first resistance line 121 and the second resistance line 122 at the same axial level uniform.

In addition, in some embodiments, the spiral pitches of the first resistive wire 121 and/or the second resistive wire 122 may be arranged in a non-uniform structure according to the temperature field requirement. For example, the first resistance line 121 and/or the second resistance line 122 have a smaller spiral pitch at the upper end to meet the requirement of higher temperature at the upper end, and a larger spiral pitch at the lower end to meet the requirement of lower temperature at the lower end. For another example, the spiral pitch of the first resistance line 121 and/or the second resistance line 122 gradually increases from the upper end to the lower end.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above examples only express the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A heating assembly is characterized by comprising a base body (11), a heating track (12) arranged on the base body (11) and two electrodes (16) respectively connected to two ends of the heating track (12); the heat generating trace (12) includes a first resistive line (121) made of a first resistive material and a second resistive line (122) made of a second resistive material and connected to the first resistive line (121), the first resistive material and the second resistive material being different.

2. The heating assembly according to claim 1, wherein the base body (11) comprises a tube body (111), the heat generating track (12) being arranged within the tube body (111).

3. The heating assembly according to claim 2, further comprising a holder (14) disposed within the tube (111) for disposing the heating trace (12).

4. The heating assembly according to claim 3, wherein the first resistance line (121) is spirally wound outside the bracket (14) in an axial direction, and an upper end of the second resistance line (122) is integrally connected to an upper end of the first resistance line (121).

5. The heating assembly according to claim 4, characterized in that said support (14) is tubular and said second resistive track (122) is linear or helical and is arranged inside said support (14).

6. The heating assembly according to claim 4, characterized in that the second resistive track (122) is rectilinear and arranged outside the support (14), or in that the second resistive track (122) is helical and wound outside the support (14).

7. The heating assembly according to claim 2, wherein the tube (111) is made of metal, and the heating assembly further comprises an insulating layer (15) disposed between the tube (111) and the heat generating track (12).

8. The heating assembly according to claim 7, wherein the insulating layer (15) comprises a ceramic or a thermally conductive glue.

9. The heating assembly according to claim 2, characterized in that the connection points (126) of the two electrodes (16) with the first (121), second (122) resistive track are located inside the tubular body (111) and at the bottom of the tubular body (111).

10. The heating element according to claim 9, characterized in that the height (H1) of the connection points (126) of the two electrodes (16) with the first (121) and second (122) resistance tracks from the bottom surface of the base body (11) is at least 1/10-1/8 of the height (H0) of the base body (11).

11. The heating assembly according to any one of claims 1 to 10, further comprising a base (13), the lower end of the base body (11) being inserted in the base (13).

12. The heating assembly according to claim 11, characterized in that the top surface of the base (13) is located below the connection point (126) of the two electrodes (16) with the first (121), second (122) resistive line or flush with the lower end surface of the connection point (126).

13. The heating element according to claim 11, characterized in that the base (13) is made of ceramic material, and the outer surface of the base body (11) is sintered or welded to the base (13).

14. The heating assembly according to any one of claims 1 to 10, wherein the two electrodes (16) are connected to the lower ends of the first resistive track (121) and the second resistive track (122), respectively; the two electrodes (16) are both wire electrodes.

15. A heating assembly according to any one of claims 1-10, wherein the resistance of both electrodes (16) is smaller than the resistance of the first resistive track (121) and the second resistive track (122).

16. A heating assembly according to any of claims 1-10, wherein the resistance of the first resistive track (121), the second resistive track (122) is 0.5-1 ohm and the resistance of the electrode (16) is 0.05-0.3 ohm.

17. The heating element according to any one of claims 1 to 10, characterized in that said first resistive track (121), said second resistive track (122) are wires of two materials or alloys of two different materials, or one of said first resistive track (121) and said second resistive track (122) is a wire and the other is an alloy wire.

18. The heating assembly according to any of claims 1 to 10, wherein one of the first resistive wire (121) and the second resistive wire (122) is a platinum-rhodium alloy wire and the other is a platinum wire, or one of the first resistive wire (121) and the second resistive wire (122) is a nichrome wire and the other is a nickel-silicon alloy wire.

19. A heating element according to any of claims 1-10, characterized in that the outer surface of the substrate (11) is provided with a protective layer comprising a ceramic layer or a glass glaze layer.

20. An aerosol generating device comprising a heating assembly as claimed in any of claims 1 to 19.