CN114983024A

CN114983024A - Electromagnetic heating coil, heating assembly and electronic atomization device

Info

Publication number: CN114983024A
Application number: CN202210620960.2A
Authority: CN
Inventors: 罗永杰; 杨保民; 范吉昌
Original assignee: Shenzhen Smoore Technology Ltd
Current assignee: Shenzhen Smoore Technology Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-09-02
Also published as: WO2023231627A1; JP7542683B2; EP4287769A1; JP2023178217A; KR20230167704A

Abstract

The application relates to an electromagnetic heating coil, a heating assembly and an electronic atomization device, wherein the electromagnetic heating coil is provided with a plurality of turns of sub-coils in the axial direction; the electromagnetic heating coil comprises a first spiral section and a second spiral section which are sequentially connected from one end to the other end in the axial direction; the pitch between any two adjacent turns of the sub-coil of the first spiral section is smaller than that between any two adjacent turns of the second spiral section. Above-mentioned electromagnetic heating coil, heating element and electronic atomization device, for the even electromagnetic heating coil of pitch among the prior art, during the circular telegram produced magnetic field, the heat-generating body that is in magnetic field generates heat, and the heat-generating body just can improve to the temperature of first spiral section to the core that aerosol generated substrate is close the one end intensification of user's suction end faster, thereby makes electronic atomization device fog fast, promotes user experience.

Description

Electromagnetic heating coil, heating assembly and electronic atomization device

Technical Field

The application relates to the technical field of atomization, in particular to an electromagnetic heating coil, a heating assembly and an electronic atomization device.

Background

The aerosol is a colloidal dispersion system formed by dispersing small solid or liquid particles in a gas medium, and can be absorbed by a human body through a respiratory system, so that a novel alternative absorption mode is provided for a user. For example, electronic aerosol devices that can bake and heat herbal or paste aerosol-generating substrates to produce aerosols are used in a variety of applications to deliver an inhalable aerosol to a user, replacing conventional product forms and absorption.

The electronic atomising device heats the aerosol-generating substrate using the heating assembly to produce an aerosol for inhalation by a user. The heating assembly of the electronic atomization device adopting the electromagnetic heating mode comprises an electromagnetic heating coil and a heating body, the electromagnetic heating coil is electrified to generate a magnetic field, the heating body is positioned in the magnetic field generated by the electromagnetic heating coil to be heated, the aerosol generating substrate is contacted with the heating body, and the heating body heats and atomizes the aerosol generating substrate.

However, the traditional electronic atomization device adopting an electromagnetic heating mode has the problem of slow fogging, and poor use experience is caused for users.

Disclosure of Invention

In view of the above, it is necessary to provide an electromagnetic heating coil, a heating assembly and an electronic atomizing device capable of increasing a fogging speed, in order to solve a problem that fogging is slow with a conventional electronic atomizing device.

An electromagnetic heating coil having a plurality of turns of sub-coils in an axial direction;

the electromagnetic heating coil comprises a first spiral section and a second spiral section which are sequentially connected from one end to the other end in the axial direction; the pitch between any two adjacent turns of the sub-coil of the first spiral section is smaller than that between any two adjacent turns of the sub-coil of the second spiral section.

In one embodiment, the pitch between any two adjacent turns of the first spiral section and the pitch between any two adjacent turns of the second spiral section are equal.

In one embodiment, the pitch between any two adjacent turns of the first helical section and the sub-coil is selected from 0mm to 4mm, and the pitch between any two adjacent turns of the second helical section and the sub-coil is selected from 0.5mm to 8 mm.

In one embodiment, the number of turns of the sub-coil included in the first spiral segment is greater than or equal to the number of turns of the sub-coil included in the second spiral segment.

In one embodiment, the electromagnetic heating coil further comprises a third helical segment, the second helical segment connecting the first helical segment and the third helical segment;

the pitch between any two adjacent turns of the sub-coil of the third spiral section is smaller than that between any two adjacent turns of the sub-coil of the second spiral section.

In one embodiment, the pitch between any two adjacent turns of the third helical segment is equal.

In one embodiment, a pitch between any two adjacent turns of the first spiral section is less than or equal to a pitch between any two adjacent turns of the third spiral section.

In one embodiment, the number of turns of the sub-coil included in the first spiral segment is greater than or equal to the number of turns of the sub-coil included in the third spiral segment.

In one embodiment, the pitch between any two adjacent turns of the third helical section and the sub-coil is selected from 0mm to 4 mm.

In one embodiment, the electromagnetic heating coil is formed by at least one bundle of conducting wires extending spirally along the axial direction, and each bundle of conducting wires comprises at least two conducting wires;

each turn of the sub-coil included in the electromagnetic heating coil has a first size in the axial direction and a second size in the radial direction, and the first size is larger than the second size.

A heating assembly, comprising:

the heating body is internally provided with an accommodating cavity, and the upper end of the heating body in the axial direction is provided with an opening communicated with the accommodating cavity;

the electromagnetic heating coil according to any one of the above claims, which is sleeved outside the heating body;

wherein, in the axial direction, two ends of the heating body are respectively positioned at two sides of the middle position of the electromagnetic heating coil; the first helical section is located at an upper portion of the second helical section in the axial direction.

In one embodiment, the heating assembly further comprises a mounting frame, the electromagnetic heating coil is sleeved outside the mounting frame, and the heating body is arranged in the mounting frame;

the mounting bracket is provided with a positioning groove which extends along the axial direction in a spiral mode, and the electromagnetic heating coil is embedded in the positioning groove.

In one embodiment, the heating assembly further comprises a magnetic shield sleeved outside the electromagnetic heating coil.

An electronic atomising device comprising an aerosol-generating substrate comprising a stem and a wick disposed within the stem, the aerosol-generating substrate being operable to be received within the receiving chamber via the opening, and a heating element as described in any above;

in the axial direction, the size of the core is smaller than the size of the accommodation cavity.

In one embodiment, when the aerosol-generating substrate is received in the receiving cavity, the end face of the core proximate the opening is located within the electromagnetic heating coil.

Above-mentioned electromagnetic heating coil, heating element and electronic atomization device for the even electromagnetic heating coil of pitch among the prior art, during the circular telegram produced magnetic field, the heat-generating body that is in magnetic field generated heat, and the heat-generating body just can improve to the temperature of first spiral section to the one end that makes the core of aerosol generation matrix be close to user's suction end heaies up sooner, thereby makes electronic atomization device hazing soon, promotes user experience.

Drawings

Fig. 1 is an isometric view of an electronic atomizer device according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of the electronic atomizer shown in FIG. 1;

FIG. 3 is a cross-sectional view of a heat generating component of the electronic atomizer shown in FIG. 1;

FIG. 4 is a structural view of a partial structure of the electronic atomizer shown in FIG. 1;

FIG. 5 is an isometric view of an electromagnetic heating coil of the electronic atomizer device shown in FIG. 1;

fig. 6 is a sectional view of the electromagnetic heating coil shown in fig. 5;

fig. 7 is a sectional view of an electromagnetic heating coil of an electronic atomizer according to another embodiment of the present application;

fig. 8 is a comparison graph of the temperature field of the heating element of the electronic atomizer according to another embodiment of the present application and the temperature field of the electronic atomizer according to the prior art.

Description of reference numerals:

100. an electronic atomization device; 200. a heating assembly; 10. a heating element; 11. an accommodating chamber; 12. an opening; 20. an electromagnetic heating coil; 21. a sub-coil; 22. a first helical section; 23. a second helical segment; 24. a third helical segment; 30. a mounting frame; 31. positioning a groove; 40. a magnetic shield; H. a first dimension; w, a second size; 300. an aerosol-generating substrate; 301. a rod body; 302. a core body.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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 intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As described in the background art, the conventional electronic atomization device adopting an electromagnetic heating mode has the problem of slow fogging, and brings a poor use experience to users.

The inventor researches and finds that the root cause of the problems is as follows: in the conventional electronic atomization device, the screw pitches of the electromagnetic heating coils in the axial direction are equal, so that the temperature of the part of the heating body, which is opposite to the electromagnetic heating coil, in the middle position in the axial direction is higher. However, the aerosol-generating substrate is heated by the heating element and is atomised, because the high temperature of the heating element is relatively in the middle, the upper portion of the core of the aerosol-generating substrate does not have the advantage of being preferentially heated and atomised, which leads to the above-mentioned problems of slow atomisation and low amount of mist in the first instance.

In view of the above, and with reference to fig. 1, the present application provides an electronic aerosol apparatus 100, the electronic aerosol apparatus 100 being adapted to heat atomize a floral, herbal, synthetic liquid, solid or paste aerosol-generating substrate 300.

Referring to fig. 2, the electronic atomizing device 100 includes a heating element 200, the heating element 200 includes a heating element 10 and an electromagnetic heating coil 20 sleeved outside the heating element 10, the electromagnetic heating coil 20 extends spirally in an axial direction, and the heating element 10 at least partially faces the electromagnetic heating coil 20 in a radial direction. The electromagnetic heating coil 20 is energised to generate a magnetic field and the heating element 10 is placed in the magnetic field generated by the electromagnetic heating coil 20 to generate heat for heating the aerosol-generating substrate 300. Specifically, the electromagnetic heating coil 20 has a middle position in the axial direction, and the heating elements 10 extend to both sides of the central position in the axial direction, that is, the heating elements 10 are correspondingly disposed on the portions of the electromagnetic heating coil 20 at both sides of the middle position.

Referring to fig. 2 and 3, a containing cavity 11 is provided in the heating element 10, and an opening 12 communicated with the containing cavity 11 is provided at one axial end of the heating element 10. The aerosol-generating substrate 300 comprises a stem 301 and a wick 302 disposed within the stem 301, the aerosol-generating substrate 300 being receivable in the receiving cavity 11 via the opening 12. When the electromagnetic heating coil 20 is energised to generate a magnetic field in which the heating element 10 generates heat, and the core 302 of the aerosol-generating substrate 300 is received in the receiving cavity 11, the heating element 10 transfers heat to the core 302 of the aerosol-generating substrate 300, and the core 302 of the aerosol-generating substrate 300 increases in temperature and atomises to form an aerosol.

In one embodiment, the two ends of the heating element 10 protrude from the electromagnetic heating coil 20 in the axial direction, so that the heating elements 10 are correspondingly arranged at the positions of the electromagnetic heating coil 20 in the axial direction, thereby reducing the waste of energy. Of course, in other embodiments, the length of the heating element 10 in the axial direction may be set smaller than the length of the electromagnetic heating coil 20 in the axial direction so that at least one end surface of the heating element 10 in the axial direction is positioned inside the electromagnetic heating coil 20.

The dimensions of the wick 302 of the aerosol-generating substrate 300 in the axial direction are smaller than the dimensions of the receiving chamber 11, so that it is ensured that the entire wick 302 is received in the receiving chamber 11, and portions of the wick 302 are in contact with the heat-generating body 10 and are heated and atomized by the heat-generating body 10.

In particular, when the aerosol-generating substrate 300 is received within the receiving cavity 11, the end face of the core 302 proximate the opening 12 is located within the electromagnetic heating coil 20. It will be appreciated that in other embodiments, the end surface of the core 302 proximate to the opening 12 may also be flush with the electromagnetic heating coil 20 when the aerosol-generating substrate 300 is received in the receiving cavity 11, and is not limited herein.

The heating assembly 200 further comprises a mounting frame 30, the electromagnetic heating coil 20 is spirally arranged outside the mounting frame 30, and the heating element 10 is arranged in the mounting frame 30. In this way, the assembly and fixation of the heating element 10 and the electromagnetic heating coil 20 are facilitated.

Referring to fig. 4, the mounting bracket 30 has a positioning groove 31 spirally extending in an axial direction, and the electromagnetic heating coil 20 is embedded in the positioning groove 31, specifically, the positioning groove 31 is a shape-imitated groove prepared by imitating a shape of the electromagnetic heating coil 20, so that the electromagnetic heating coil 20 is firmly fixed on the mounting bracket 30.

Referring to fig. 3, the heating assembly 200 further includes a magnetic shield 40, and the magnetic shield 40 is disposed outside the electromagnetic heating coil 20. On the one hand, the magnetic shield 40 can fix the electromagnetic heating coil 20, and the magnetic shield 40 can prevent the electromagnetic heating coil 20 from radiating electromagnetic waves to the outside. Specifically, the magnetic shield 40 is adhesively fixed to the electromagnetic heating coil 20.

Referring to fig. 5, the electromagnetic heating coil 20 has a plurality of turns of sub-coils 21 in the axial direction, and specifically, the electromagnetic heating coil 20 is formed by at least one bundle of wires extending spirally in the axial direction, each bundle of wires including at least two wires, that is, each bundle of wires including at least two wires, each bundle of wires being formed by twisting at least two (two) wires.

Referring to fig. 6, each of the sub-coils 21 has a first dimension H in an axial direction and a second dimension W in a radial direction, the first dimension H being greater than the second dimension W.

In the electromagnetic heating coil 20, the size of each turn of the sub-coil 21 in the radial direction is smaller than that in the axial direction, compared with the prior art in which the cross section of each turn of the sub-coil 21 of the electromagnetic heating coil 20 is circular (when the cross section of the electromagnetic heating coil 20 is circular, the radial size and the axial size of each turn of the sub-coil 21 are equal), the following advantages are provided:

1. the electromagnetic heating coil 20 is reduced in size in the radial direction, and thus the electronic atomization device 100 is reduced in size in the radial direction (lateral space), which facilitates miniaturization of the electronic atomization device 100.

2. Under the condition that the diameter of the whole electromagnetic heating coil 20 is the same, the peripheral perimeter is larger, the heat dissipation of the electromagnetic heating coil 20 is more facilitated, the temperature of the electromagnetic heating coil 20 and the loss of the electromagnetic heating coil 20 are reduced, and the service life of the electromagnetic heating coil 20 is prolonged.

3. When the diameter of the entire electromagnetic heating coil 20 is the same, the projected area of the orthogonal projection of the electromagnetic heating coil 20 on the plane where the heating element 10 is located is large, and the heating area can be increased and the uniformity of the magnetic field can be improved.

Meanwhile, the electromagnetic heating coil 20 provided in the present embodiment is formed by at least one bundle of wires extending spirally in the axial direction, and each bundle of wires includes at least two strands of wires, so that compared to the case where the electromagnetic heating coil 20 in the prior art is formed by spirally extending a flat metal strip, the ac resistance of the electromagnetic heating coil 20 under a high-frequency current can be reduced, and the loss of the energy of the electronic atomization device 100 itself can be reduced.

In one embodiment, each sub-coil 21 has a rectangular cross-sectional shape. Because the length of one group of sides of the rectangle is greater than that of the other group of sides, when the cross section of each turn of the sub-coil 21 is rectangular, the long sides of the group of the rectangle are arranged along the axial direction, and the short sides of the group of the rectangle are arranged along the radial direction, so that the axial size of each turn of the sub-coil 21 can be ensured to be greater than the radial size, namely the first size H is greater than the second size W.

In another embodiment, the cross-sectional shape of each turn of the sub-coil 21 is elliptical. Since the oval shape has a major axis and a minor axis, when the cross-sectional shape of each turn of sub-coil 21 is set to be oval, the major axis is set along the axial direction, and the minor axis is set along the radial direction, so that the dimension of each turn of sub-coil 2121 in the axial direction can be ensured to be larger than that in the radial direction, that is, the first dimension H is larger than the second dimension W.

It is understood that in other embodiments, the cross-sectional shape of each turn of the sub-coil 21 is not limited to the above-described rectangular shape and the oval shape, and can be set as desired.

In one embodiment, the electromagnetic heating coil 20 is formed by a bundle of wires extending spirally in the axial direction, each bundle of wires includes 15 to 300 strands of wires, and each strand of wires has a diameter of 0.02 to 0.5 mm. Specifically, each bundle of wires comprises 100 strands of wires, each strand having a diameter of 0.1 mm. When the electromagnetic heating coil 20 is manufactured, 100 strands of wires with a diameter of 0.1mm are twisted together to form a bundle of wires, the bundle of wires is pressed into a desired shape by a special device, and finally the bundle of wires is spirally extended in the axial direction to form the electromagnetic heating coil 20.

In another embodiment, the electromagnetic heating coil 20 is formed by spirally extending a plurality of bundles of wires in the axial direction, each bundle of wires includes 15 to 300 strands of wires, and each strand of wires has a diameter of 0.02 to 0.5 mm. Specifically, the electromagnetic heating coil 20 is formed by spirally extending three wire bundles in the axial direction, each of which includes 100 strands of wires each having a diameter of 0.1 mm. When the electromagnetic heating coil 20 is manufactured, 100 strands of wires with the diameter of 0.1mm are firstly twisted together to form a bundle of wires, then the three bundles of wires are twisted together, the twisted wires are pressed into a required shape through special equipment, and finally the three bundles of wires pressed into a specific shape are spirally extended along the axial direction to form the electromagnetic heating coil 20.

Of course, in other embodiments, the number of wire bundles included in the electromagnetic heating coil 20, the number of strands of wires included in each wire bundle, and the diameter of each wire bundle are not particularly limited. As in some embodiments, the electromagnetic heating coil 20 is formed by two wire bundles each including 150 strands of wire each having a diameter of 0.05mm extending spirally in the axial direction.

With continued reference to fig. 6, the electromagnetic heating coil 20 includes, from one end to the other end in the axial direction, a first spiral segment 22 and a second spiral segment 23 that are connected in series. The pitch between any two adjacent sub-coils 21 of the first helical section 22 is smaller than the pitch between any two adjacent sub-coils 21 of the second helical section 23.

Referring to fig. 2, taking the direction in fig. 2 as an example, the axial direction of the electromagnetic heating coil 20 is the up-down direction in fig. 2, and the radial direction is the left-right direction in fig. 2.

The opening 12 is provided at the upper end of the heat-generating body 10, and the aerosol-generating substrate 300 is inserted into the accommodating chamber 11 from the top down, and at this time, the core 302 of the aerosol-generating substrate 300 is accommodated in the accommodating chamber 11. The first spiral section 22 is provided at the upper end of the second spiral section 23.

Thus, because the pitch between any two adjacent turns of the sub-coil 21 of the first spiral section 22 is smaller than the pitch between any two adjacent turns of the sub-coil 21 of the second spiral section 23, compared with the electromagnetic heating coil 20 with a medium pitch in the prior art, when the electromagnetic heating coil 20 is powered on, the magnetic induction intensity of the electromagnetic heating coil 20 is changed, so that the temperature of the heating body 10 facing the upper part of the electromagnetic heating coil 20 is increased, the temperature rise speed of the upper part of the core body 302 accommodated in the accommodating cavity 11 is increased, the fogging speed and the fogging amount of the first port of the electronic atomizing device 100 are increased, and the smoking taste is improved.

Here, it should be noted that the pitch between the two adjacent turns of the sub-coils 21 is the axial distance between the two adjacent sub-coils 21.

Further, referring to fig. 5 and 6, the pitch between any two adjacent sub-coils 21 of the first spiral section 22 is equal, and the pitch between any two adjacent sub-coils 21 of the second spiral section 23 is equal. In this way, the preparation of the electromagnetic heating coil 20 is facilitated. It should be understood that in other embodiments, the pitch between each two adjacent sub-coils 21 included in the first spiral segment 22 may be different or partially equal, and the pitch between each two adjacent sub-coils 21 included in the second spiral segment 23 may be different or partially equal.

In one embodiment, the number of turns of the sub-coil 21 included in the first spiral section 22 is greater than or equal to the number of turns of the sub-coil 21 included in the second spiral section 23 to further increase the temperature of the upper portion of the electric heating body 10 in the axial direction. Of course, in other embodiments, the number of turns of the sub-coil 21 included in the first spiral segment 22 may be smaller than the number of turns of the sub-coil 21 included in the second spiral segment 23.

The pitch between any two adjacent sub-coils 21 of the first spiral section 22 is selected from 0mm to 4mm, and the pitch between any two adjacent sub-coils 21 of the second spiral section 23 is selected from 0.5mm to 8 mm. Here, the pitch between the adjacent two sub-coils 21 of the first spiral segment 22 and the pitch between the adjacent two sub-coils 21 of the second spiral segment 23 are not particularly limited and may be selected as needed.

In one embodiment, referring to fig. 7, the electromagnetic heating coil 20 further includes a third spiral section 24, and the second spiral section 23 connects the first spiral and the third spiral section 24. The pitch between any two adjacent sub-coils 21 of the third helical section 24 is smaller than the pitch between any two adjacent sub-coils 21 of the second helical section 23.

Thus, because the pitch between any two adjacent sub-coils 21 of the first spiral section 22 and the pitch between any two adjacent sub-coils 21 of the third spiral section 24 are both smaller than the pitch between any two adjacent sub-coils 21 of the second spiral section 23, compared with the electromagnetic heating coil 20 with a medium pitch in the prior art, the magnetic induction intensity of the electromagnetic heating coil 20 is changed during the energization, so that the temperature of the heating element 10 facing the upper part of the electromagnetic heating coil 20 is improved, the temperature difference of the heating element 10 in the upper, middle and lower parts in the axial direction is reduced, the attenuation of the fog amount in the pumping process is slow, and the fog amount uniformity in the pumping process is improved.

The pitch between any adjacent two sub-coils 21 of the third helical section 24 is equal to facilitate the preparation of the electromagnetic heating coil 20. It should be understood that in other embodiments, the third helical segment 24 may be provided to include sub-coils 21 with different pitches between each two adjacent turns, or partially equal pitches,

further, the pitch between any two adjacent sub-coils 21 of the first helical section 22 is less than or equal to the pitch between any two adjacent sub-coils 21 of the third helical section 24. Of course, in other embodiments, the pitch between any two adjacent sub-coils 21 of the first spiral section 22 may be greater than the pitch between any two adjacent sub-coils 21 of the third spiral section 24, or the pitch between two adjacent sub-coils 21 of part of the first spiral section 22 may be greater than the pitch between two adjacent sub-coils 21 of part of the third spiral section 24.

In one embodiment, the number of turns of the sub-coil 21 included in the first spiral segment 22 is greater than or equal to the number of turns of the sub-coil 21 included in the third spiral segment 24, so as to further increase the temperature of the upper portion of the electric heating body 10 in the axial direction. Of course, in other embodiments, the number of turns of the sub-coil 21 included in the first spiral segment 22 may be set smaller than the number of turns of the sub-coil 21 included in the third spiral segment 24.

The pitch between any adjacent two turns of the third helical segment 24 is selected from 0mm to 4 mm. It should be noted that the pitch between two adjacent turns of the sub-coil 21 of the third helical segment 24 is not particularly limited and may be selected according to the requirement.

In order to more clearly understand the present application, an embodiment is described below in comparison with a pair of proportions.

In both the examples and the comparative examples, the following were set:

the dimension of the electromagnetic heating coil 20 in the axial direction is 18mm, the length of the core 302 is 20mm, the core 302 is entirely accommodated in the accommodating chamber 11 of the heating element 10, and the upper end face of the core 302 is 3mm higher than the upper end face of the electromagnetic heating coil 20. The dimension of each turn of the sub-coil 21 in the axial direction is 1.6 mm.

Referring to fig. 8, three circles in fig. 8 represent a high temperature field, a medium temperature field, and a low temperature field theoretically formed by the heating element 20, in order from top to bottom.

In the comparative example: the electromagnetic heating coil 20 is a uniformly wound coil, that is, the thread pitch between every two adjacent sub-coils 21 of the electromagnetic heating coil 20 is equal.

As is clear from fig. 8, in the comparative example, the center of the theoretical high temperature field of the heating element 10 is at the center position in the axial direction of the electromagnetic heating coil 20, that is, at the position 6mm below the upper end surface of the core 302.

In the examples: the electromagnetic heating coil 20 includes a first spiral section 22 and a second spiral section 23, the first spiral section 22 having a dimension of 8mm in the axial direction, and the second spiral section 23 having a dimension of 10mm in the axial direction. The first spiral section 22 includes 5 turns of the sub-coils 21, and each adjacent two turns of the sub-coils 21 of the first spiral section 22 have a pitch of 0 in the axial direction. The second spiral section 23 comprises 3 turns of sub-coils 21, and every two adjacent turns of the second spiral section 23 are equally spaced in the axial direction and are close to 2 mm.

As can be seen from fig. 8, in the embodiment, the center of the theoretical high temperature field of the heating element 10 is located at the upper side of the center position in the axial direction of the electromagnetic heating coil 20, that is, at the lower side of 3mm from the upper end surface of the core 302.

Through the comparison, it can be found that the temperature of the upper part of the heating element 10 can be increased by using the electromagnetic heating coil 20 provided in the embodiment of the present application, so that the electronic atomization device 100 can be ensured to have fast first-opening fogging and good suction experience.

Another embodiment of the present application further provides a heating assembly 200 included in the electronic atomization device 100.

Yet another embodiment of the present application further provides an electromagnetic heating coil 20 included in the heating assembly 200 described above. The electromagnetic heating coil 20 has a plurality of turns of sub-coils 21 in the axial direction, and includes a first spiral section 22 and a second spiral section 23 connected in sequence from one end to the other end in the axial direction, and the pitch between any two adjacent turns of the sub-coils 21 of the first spiral section 22 is smaller than the pitch between any two adjacent turns of the sub-coils 21 of the second spiral section 23. Thus, compared with the electromagnetic heating coil 20 with uniform pitch in the prior art, when the electromagnetic heating coil is electrified to generate a magnetic field, the heating element 10 in the magnetic field generates heat, and the temperature of the heating element 10 facing the first spiral section 22 is increased, so that the temperature of the end, close to the suction end of a user, of the core 302 of the aerosol generating substrate 300 is increased quickly, the electronic atomization device 100 is enabled to be fast in fogging, and the user experience is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.

Claims

1. An electromagnetic heating coil for an electronic atomizer, said electromagnetic heating coil having a plurality of turns of sub-coils in an axial direction;

the electromagnetic heating coil comprises a first spiral section and a second spiral section which are sequentially connected from one end to the other end in the axial direction; the pitch between any two adjacent turns of the sub-coil of the first spiral section is smaller than that between any two adjacent turns of the second spiral section.

2. The electromagnetic heating coil of claim 1 wherein a pitch between any adjacent two of said sub-coils of said first helical section is equal and a pitch between any adjacent two of said sub-coils of said second helical section is equal.

3. The electromagnetic heating coil of claim 1 wherein a pitch between any adjacent two of said sub-coils of said first helical section is selected from 0mm to 4mm and a pitch between any adjacent two of said sub-coils of said second helical section is selected from 0.5mm to 8 mm.

4. The electromagnetic heating coil of claim 1 wherein said first helical section includes said sub-coil having a number of turns greater than or equal to a number of turns of said sub-coil included in said second helical section.

5. The electromagnetic heating coil according to any one of claims 1 to 4, characterized in that the electromagnetic heating coil further comprises a third helical section, the second helical section connecting the first helical section and the third helical section;

6. The electromagnetic heating coil of claim 5 wherein a pitch between any adjacent two of said sub-coils of said third helical section is equal.

7. The electromagnetic heating coil of claim 5 wherein a pitch between any adjacent two of said sub-coils of said first helical section is less than or equal to a pitch between any adjacent two of said sub-coils of said third helical section.

8. The electromagnetic heating coil of claim 5 wherein said first helical section includes said sub-coil having a number of turns greater than or equal to a number of turns of said sub-coil included in said third helical section.

9. The electromagnetic heating coil of claim 5 wherein a pitch between any adjacent two of said sub-coils of said third helical section is selected from 0mm to 4 mm.

10. The electromagnetic heating coil according to claim 1, wherein said electromagnetic heating coil is formed by spirally extending at least one bundle of wires in said axial direction, each bundle of wires comprising at least two wires;

11. A heating assembly, comprising:

the electromagnetic heating coil according to any one of claims 1 to 10, which is sheathed outside the heat generating body;

12. The heating assembly of claim 11, wherein the electromagnetic heating coil further comprises a third helical segment, the second helical segment connecting the first helical segment with the third helical segment;

13. The heating assembly of claim 11, further comprising a mounting frame, wherein the electromagnetic heating coil is sleeved outside the mounting frame, and the heating element is arranged in the mounting frame;

14. The heating assembly of claim 11, further comprising a magnetic shield disposed about said electromagnetic heating coil.

15. An electronic atomisation device comprising an aerosol-generating substrate comprising a stem and a wick disposed within the stem, the aerosol-generating substrate being operable to be received within the receiving chamber via the opening, and a heating element as claimed in any of claims 9 to 14;

16. The electronic atomization device of claim 15 wherein an end surface of the core proximate the opening is positioned within the electromagnetic heating coil when the aerosol-generating substrate is received within the receiving cavity.