Heat-Not-Burn Cartridge

This application is a National Stage of International Application No. PCT/CN2022/095321, filed May 26, 2022, which claims priority to Chinese Patent Application No. 202221116237.2, filed May 10, 2022, the entire disclosure of which is hereby incorporated by reference.

This disclosure relates to electronic atomization devices, and in particular to a heat-not-burn cartridge.

With the development of science and technology, more and more users use heat-not-burn cartridges. When the heat-not-burn cartridge is drawn, the aerosol concentration is easy to be insufficient.

A heat-not-burn cartridge is provided in implementations of the present disclosure. The heat-not-burn cartridge includes a tube, a closing portion, a smoke generating portion, a cooling portion, and a filter portion. The tube has a first end and a second end opposite to the first end. The closing portion is configured to seal the first end. The smoke generating portion is accommodated in the tube and disposed adjacent to the first end. The cooling portion is accommodated in the tube and disposed adjacent to the smoke generating portion. The filter portion is accommodated in the tube and disposed at the second end. The filter portion is spaced apart from the cooling portion to define an accommodating cavity.

Reference signs: heat-not-burn cartridge; tube; closing portion; smoke generating portion; cooling portion; filter portion; accommodating cavity; package; first end; second end; gas groove; first accommodating space; second accommodating space; gas hole; chamfer.

A heat-not-burn cartridge is provided in implementations of the present disclosure. The heat-not-burn cartridge includes a tube, a closing portion, a smoke generating portion, a cooling portion, and a filter portion. The tube has a first end and a second end opposite to the first end. The closing portion is configured to seal the first end. The smoke generating portion is accommodated in the tube and disposed adjacent to the first end. The cooling portion is accommodated in the tube and disposed adjacent to the smoke generating portion. The filter portion is accommodated in the tube and disposed at the second end. The filter portion is spaced apart from the cooling portion to define an accommodating cavity.

In a direction from the first end to the second end, a ratio of a length Lof the accommodating cavity to a length Lof the tube satisfies: 30%≤L/L≤35%.

The cooling portion defines uniformly distributed gas grooves in a periphery of the cooling portion. The gas grooves each penetrate through the cooling portion in a direction from the first end to the second end. The gas grooves each are in communication with the accommodating cavity.

The cooling portion defines a first accommodating space and a second accommodating space opposite to each other in the direction from the first end to the second end. The first accommodating space is closer to the smoke generating portion than the second accommodating space. The first accommodating space is used for accommodating the smoke generating portion. The second accommodating space is in communication with the accommodating cavity.

The cooling portion further defines a gas hole. The gas hole is in communication with the first accommodating space and the second accommodating space.

In a preset cross-sectional direction, a ratio of a sum of cross-sectional areas Sof the gas grooves and a cross-sectional area Sof the gas hole to a cross-sectional area Sof the cooling portion satisfies: 15%≤(S+S)/S≤20%. The preset cross-sectional direction is perpendicular to the direction from the first end to the second end.

An outer diameter Dof the cooling portion is larger than an inner diameter Dof the tube. The cooling portion is in an interference fit with the tube. The cooling portion is fixed to the tube.

The cooling portion defines a chamfer at each of both ends of the cooling portion. An outer diameter of the cooling portion at the chamfer is smaller than the inner diameter of the tube.

A material of the cooling portion includes at least one of poly(ether-ether-ketone) (PEEK), polyphenylene sulfone resins (PPSU), poly(ethylene imine) (PEI), polyamide (PA), polyoxymethylene (POM), or silica gel.

The following will clearly and completely describe technical solutions of embodiments of the present disclosure with reference to the accompanying drawings. Apparently, embodiments described herein are merely some embodiments, rather than all embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort shall fall within the protection scope of the present disclosure.

The terms such as “first”, “second”, etc., in the specification, the claims, and the above accompanying drawings of the present disclosure are used to distinguish different objects, rather than describing a particular order. In addition, the terms “including”, “comprising”, and “having” as well as variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units is not limited to the listed steps or units, on the contrary, it can optionally include other steps or units that are not listed; alternatively, other steps or units inherent to the process, method, product, or device can be included either.

The term “embodiment” or “implementation” referred to herein means that particular features, structures, or properties described in conjunction with implementations may be defined in at least one embodiment of the present disclosure. The phrase “embodiment” or “implementation” appearing in various places in the specification does not necessarily refer to the same embodiment or an independent/alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will understand expressly and implicitly that an embodiment described in the present disclosure may be combined with other embodiments.

A heat-not-burn cartridgeis provided in implementations of the present disclosure. Reference can be made to,, and, whereis a schematic structural view of a heat-not-burn cartridge provided in implementations of the present disclosure,is an exploded perspective view of the heat-not-burn cartridge provided in the implementations in, andis a schematic cross-sectional view of the heat-not-burn cartridge provided in an implementation of the implementations intaken along line A-A. In the implementations, the heat-not-burn cartridgeincludes a tube, a closing portion, a smoke generating portion, a cooling portion, and a filter portion. The tubehas a first endand a second endopposite to the first end. The closing portionis configured to seal the first end. The smoke generating portionis accommodated in the tubeand disposed adjacent to the first end. The cooling portionis accommodated in the tubeand disposed adjacent to the smoke generating portion. The filter portionis accommodated in the tubeand disposed at the second end. The filter portionis spaced apart from the cooling portionto define an accommodating cavity.

In this implementation, the tubehas an accommodating function. Specifically, the tubecan accommodate the smoke generating portion, the cooling portion, and the filter portion. The tubeis made of a food-graded material, which may be, but is not limited to, one or more of white cardboard paper of 50 g/m-200 g/mor kraft paper of 50 g/m-200 g/m. In an implementation, the tubeis formed by convolutedly winding the food-graded material. Specifically, the tubeis formed by convolutedly winding two to three layers of the food-graded material. In another implementation, the tubeis formed by spirally winding the food-graded material. Specifically, the tubeis formed by spirally winding two to three layers of the food-graded material. Specifically, a length Lof the tubesatisfies: 42 mm≤L≤46 mm. An inner diameter Dof tubesatisfies: 6.4 mm≤D≤6.65 mm. An outer diameter Dof the tubesatisfies: 6.9 mm≤D≤7.1 mm. When a user uses the heat-not-burn cartridge, the first endof the tubeis a far-lip end, and the second endis a near-lip end.

In this implementation, the closing portionis configured to seal the first endof the tube, to prevent the smoke generating portionfrom falling off from the first end. The closing portionis made of a food-graded material, which may be, but is not limited to, one or more of silk tissue paper of 10 g/m-50 g/m, highly air-permeable paper of 10 g/m-50 g/m, or butter paper of 45 g/m-105 g/m. Specifically, the food-graded material is adhered to an end surface of the tubeclose to the first endby an adhesive first, and then the food-graded material is cut along an outer contour of the tubeto form the closing portion. The closing portionmay be formed by cutting, but not limited to, die punching, cutter punching, laser cutting, or the like.

In this implementation, a material of the smoke generating portionincludes an aerosol-generating substrate (such as at least one of a smoke generating particle or a smoke generating sheet). A material of the aerosol-generating substrate includes tobacco or a non-tobacco plant herbaceous unit. When the aerosol-generating substrate includes the non-tobacco plant herbaceous unit, the aerosol-generating substrate does not produce harmful substances such as tar, nicotine, or the like. In addition, when the plant herbaceous unit is heated, the plant herbaceous unit will not burn, pollute the surrounding environment, or affect the surrounding people, thereby ensuring the physical health of people who draw the heat-not-burn cartridgeand the physical health of the surrounding people. Moreover, when the plant herbaceous unit in the aerosol-generating substrate includes a material of a traditional Chinese medicine (such as ginseng and gastrodia elata), the heat-not-burn cartridgecan have a good health care function. Furthermore, a packing length Lof the smoke generating portionaccommodated in the tubesatisfies: 13 mm≤L≤18 mm.

In this implementation, the cooling portionis accommodated in the tubeand disposed adjacent to the smoke generating portion. The cooling portionis configured to lower the temperature of the aerosol produced by the smoke generating portion. In an implementation, the cooling portionis spaced apart from the smoke generating portion. In another implementation, the cooling portionabuts against the smoke generating portion.

In this implementation, the filter portionis accommodated in the tubeand disposed at the second end. A material of the filter portionincludes a food-grade porous fluffy material, such as polylactic acid (PLA), etc. Specifically, the filter portionis formed by an extrusion molding process. An outer diameter Dof the filter portionis larger than an inner diameter Dof the tube, so that the filter portionis in interference fit with the tube, and the filter portionis fixed to the second end. Specifically, Dsatisfies: 6.5 mm≤D≤7 mm. In addition, an end surface of the filter portionaway from the first endis flush with an end surface of the tubeat the second end.

In addition, the filter portionis spaced apart from the cooling portionto define the accommodating cavity. The accommodating cavitycan accommodate aerosol produced by heating the smoke generating portion. The aerosol produced by heating the smoke generating portionflows into the accommodating cavityafter being cooled by the cooling portion, and is gathered in the accommodating cavity, and finally, the aerosol is drawn by the user through the filter portion. Since the aerosol may be gathered in the accommodating cavityto form aerosol with a certain concentration, the concentration of the aerosol passing through the filter portioncan be increased, that is, the concentration of the aerosol drawn by the user is increased.

In summary, the heat-not-burn cartridgeis provided in the implementations of the present disclosure. The heat-not-burn cartridgeincludes the tube, the closing portion, the smoke generating portion, the cooling portion, and the filter portion. The tubehas the first endand the second endopposite to the first end. The closing portionis configured to seal the first end. The smoke generating portionis accommodated in the tubeand disposed adjacent to the first end. The cooling portionis accommodated in the tubeand disposed adjacent to the smoke generating portion. The filter portionis accommodated in the tubeand disposed at the second end. The filter portionis spaced apart from the cooling portionto define the accommodating cavity. The aerosol produced by heating the smoke generating portionis gathered in the accommodating cavity, so that the aerosol with a certain concentration is formed in the accommodating cavity, thereby increasing the concentration of the aerosol for the user to draw. Therefore, heat-not-burn cartridgein the present disclosure can increase the drawing concentration of the aerosol.

Referring toagain, in this implementation, in a direction from the first endto the second end, a ratio of a length Lof the accommodating cavityto a length Lof the tubesatisfies: 30%≤L/L≤35%.

In this implementation, the accommodating cavityneeds to have a certain length, to provide enough space for accommodating the aerosol to increase the concentration of the aerosol. When the length Lof the tubeis constant, the length Lof the accommodating cavitymay affect a packing length Lof the smoke generating portion. In other words, if the length Lof the accommodating cavityis too long, the packing length Lof the smoke generating portionmay be too small, thereby affecting the smoke generating amount of the smoke generating portion, and reducing the drawing experience of the heat-not-burn cartridge. Therefore, the accommodating cavityneeds to keep an appropriate length. Specifically, in the direction from the first endto the second end, the ratio of the length Lof the accommodating cavityto the length Lof the tubesatisfies: 30%≤L/L≤35%. The accommodating cavitycannot only accommodate the aerosol to improve the drawing concentration of the aerosol, but also allow sufficient space to be reserved in the tubeto pack the smoke generating portionto ensure the smoke generating amount of the smoke generating portion.

Reference can be made to,, and, whereis a schematic cross-sectional view of the heat-not-burn cartridge provided in another implementation of the implementations intaken along line A-A,is a schematic structural view of a cooling portion in the heat-not-burn cartridge provided in the implementation in, andis a schematic sectional view of a cooling portion in the heat-not-burn cartridge provided in the implementation intaken along line B-B. In this implementation, the cooling portiondefines uniformly distributed gas groovesin a periphery of the cooling portion. The gas grooveseach penetrate through the cooling portionin a direction from the first endto the second end. The gas grooveseach are in communication with the accommodating cavity.

In this implementation, multiple gas groovesare uniformly distributed in the periphery of the cooling portion. The multiple gas groovescan increase air permeability of the cooling portion, so that the aerosol produced by heating the smoke generating portioncan pass through the cooling portionbetter. Specifically, the multiple gas groovesand the inner wall of the tubecooperatively define passages, so that the aerosol can pass through the passages. When the smoke generating portioncontains the granular aerosol-generating substrate, that is, smoke generating particles, an inner diameter of each gas grooveis smaller than an outer diameter of a single smoke generating particle, so as to prevent the smoke generating particles from falling through the gas groovesinto other structures in the heat-not-burn cartridge, thereby avoiding affecting the use of the heat-not-burn cartridge. Specifically, in a preset cross-sectional direction, the maximum width W of the gas groovesatisfies: 0.8 mm≤W≤1.2 mm, and the depth H of the gas groovesatisfies: 0.5 mm≤H≤0.6 mm. The preset cross-sectional direction is perpendicular to the direction from the first endto the second end.

Reference can be made to,, andtogether, whereis a schematic cross-sectional view of the heat-not-burn cartridge provided in yet another implementation of the implementations intaken along line A-A,is a schematic structural view of the heat-not-burn cartridge provided in the implementation inin a first state, andis a schematic structural view of the heat-not-burn cartridge provided in the implementation inin a second state. In this implementation, the cooling portiondefines a first accommodating spaceand a second accommodating spaceopposite to each other in the direction from the first endto the second end. The first accommodating spaceis closer to the smoke generating portionthan the second accommodating space. The first accommodating spacemay be used for accommodating the smoke generating portion. The second accommodating spaceis in communication with the accommodating cavity.

In this implementation, the first accommodating spacecan provide sufficient space for the smoke generating portionto move. If without the first accommodating space, when the smoke generating portionis squeezed, the density of the smoke generating portionis increased, so that the air gap inside the smoke generating portionis reduced, thereby increasing the resistance to draw of the heat-not-burn cartridgeand affecting the use of the user. Specifically, when the heat-not-burn cartridgeis heated, the heat-not-burn cartridgeneeds to be inserted into a smoking set, so that a heating component (e.g., a heating needle or a heating sheet) in the smoking set is inserted into the smoke generating portion. Since the heating component has a certain volume, the smoke generating portionmay be squeezed by the heating component, and the squeezed part of the smoke generating portionmay enter the first accommodating spaceto partially or completely fill the first accommodating space, thereby avoiding the excessive resistance to draw caused by the aerosol-generating substrate being squeezed. Specifically, a volume of the first accommodating spaceismm-35 mm, so that the first accommodating spaceprovides sufficient space for the smoke generating portionto move.

In this implementation, when the manufacturing of the heat-not-burn cartridgeis completed, the heat-not-burn cartridgeis in a first state (referring to), and the smoke generating portionis completely outside the first accommodating space. When the heat-not-burn cartridgeis inserted into the smoking set, the heat-not-burn cartridgeis in a second state (referring to), and part of the smoke generating portionenters the first accommodating spaceto partially or completely fill the first accommodating space. It may be noted that in, the part of the smoke generating portionenters the first accommodating spaceand partially fills the first accommodating space, but the amount of the smoke generating portionentering the first accommodating spaceis not limited. It may be noted that during the manufacturing of the heat-not-burn cartridge, a part of the smoke generating portionmay enter the first accommodating spacedue to a machining tolerance, transportation between machining procedures, or other reasons, so that the heat-not-burn cartridgeis also in the second state. It may be noted that when the heat-not-burn cartridgeis not inserted into the smoking set, a part of the smoke generating portionmay enter the first accommodating spacedue to transportation, external force collision, or other reasons, so that the heat-not-burn cartridgeis also in the second state. Therefore, the first state only indicates that the smoke generating portionis completely outside the first accommodating space, and the second state only indicates that a part of the smoke generating portionsenters the first accommodating space. It can be understood that the first state and the second state do not limit a use state of the heat-not-burn.

The second accommodating spacemay be the same as or different from the first accommodating space, but the second accommodating spacehas the same function as the first accommodating space. That is, in another implementation, when an orientation of the cooling portionis opposite to an orientation of the cooling portionillustrated in, the second accommodating spaceis closer to the smoke generating portionthan the first accommodating space, the smoke generating portionmay enter the second accommodating space, and the first accommodating spaceis in communication with the accommodating cavity. The volume of the second accommodating spaceis 30 mm-35 mm.

In addition, when the first accommodating spaceis the same as the second accommodating space, the thickness of the cooling portionmay be uniform, so as to prevent the cooling portionfrom shrinking and deforming during manufacturing, which is beneficial to controlling the size of each part of the cooling portion.

Reference can be made to, which is a schematic cross-sectional view of the heat-not-burn cartridge provided in yet another implementation of the implementations intaken along line A-A. In this implementation, the cooling portionfurther defines a gas hole. The gas holeis in communication with the first accommodating spaceand the second accommodating space.

In this implementation, the cooling portionfurther defines the gas hole, and the gas holeis in communication with the first accommodating spaceand the second accommodating space. The gas holecan increase air permeability of the cooling portion, so that the aerosol produced by heating the smoke generating portioncan pass through the cooling portionbetter. When the smoke generating portioncontains the granular aerosol-generating substrate, that is, smoke generating particles, an inner diameter of the gas holeis smaller than an outer diameter of a single smoke generating particle, so as to prevent the smoke generating particles from falling through the gas holeinto other structures in the heat-not-burn cartridge, thereby avoiding affecting the use of the heat-not-burn cartridge. Specifically, the inner diameter Dof the gas holesatisfies: 0.6 mm≤D≤1 mm.

Reference can be made toand, whereis a schematic structural view of a cooling portion in the heat-not-burn cartridge provided in the implementation in, andis a schematic sectional view of the cooling portion in the heat-not-burn cartridge provided intaken long line C-C. In this implementation, in a preset cross-sectional direction, a ratio of a sum of cross-sectional areas Sof the gas groovesand a cross-sectional area Sof the gas holeto a cross-sectional area Sof the cooling portionsatisfies: 15%≤(S+S)/S≤20%, where the preset cross-sectional direction is perpendicular to the direction from the first endto the second end.

In this implementation, in the preset cross-sectional direction, a cross section of each gas groove, a cross section of the gas hole, and a cross section of the cooling portionare illustrated in. The gas grooveand the gas holeeach need to have a suitable size so that the heat-not-burn cartridgehas the suitable resistance to draw. If the size of each of the gas grooveand the gas holeis too large, the resistance to draw of the heat-not-burn cartridgeis too small, which affects the drawing experience of the user. If the size of each of the gas grooveand the gas holeis too small, the resistance to draw of the heat-not-burn cartridgeis too large, which also affects the drawing experience of the user. In addition, if the size of each of the gas grooveand the gas holeis too small, the concentration of the aerosol in the heat-not-burn cartridgefor drawing may also be too low. Therefore, the gas grooveand the gas holeeach need to have a suitable size. Specifically, in the preset cross-sectional direction, the ratio of the sum of the cross-sectional areas Sof the gas groovesand the cross-sectional area Sof the gas holeto the cross-sectional area Sof the cooling portionsatisfies: 15%≤(S+S)/S≤20%, where the preset cross-sectional direction is perpendicular to the direction from the first endto the second end. Sis the sum of cross-sectional areas of all the gas groovesin the preset cross-sectional direction.

Referring toagain, and reference can be made to, which is a schematic structural cross-sectional view of the cooling portion in the heat-not-burn cartridge provided in the implementation in. In this implementation, an outer diameter Dof the cooling portionis larger than an inner diameter Dof the tube, so that the cooling portionis in interference fit with the tube, and the cooling portionis fixed to the tube.

In this implementation, the outer diameter Dof the cooling portionis larger than the inner diameter Dof the tube, so that the cooling portionis in interference fit with the tube, and the cooling portioncan be fixed to the tube. Therefore, the cooling portioncan be disposed in the tubeat a preset position of the tubeand keep a relative position unchanged, so as to support the tube. Specifically, the outer diameter Dof the cooling portionsatisfies: 6.5 mm≤D≤6.8 mm. The inner diameter Dof the tubesatisfies: 6.4 mm≤D≤6.65 mm.

Referring toandagain, in this implementation, the cooling portiondefines a chamferat each of both ends of the cooling portion. An outer diameter of the cooling portionat the chamferis smaller than the inner diameter of the tube.

In this implementation, both ends of the cooling portioneach define the chamfer, so that the outer diameter of the cooling portionat the chamferis smaller than the inner diameter of the tube. When the cooling portionis packed into the tube, the chamfercan play a role of guiding and assisting the packing. If the cooling portionhas no chamfer, or if the outer diameter of the cooling portionat the chamferis larger than or equal to the inner diameter of the tube, the cooling portionmay squeeze the second endwhen the cooling portionis packed into the tube, thereby damaging the tube. Therefore, the outer diameter of the cooling portionat the chamferis smaller than the inner diameter of the tube, so that the damage to the second endof the tubecan be avoided when the cooling portionis packed into the tube. Specifically, a length Lof the chamferin a radial direction of the cooling portionsatisfies: 0.6 mm≤L≤1 mm. An angle of the chamferis not limited, such as 30°, 45°, 60°, 75°, etc.

Referring toandagain, in this implementation, the length Lof the cooling portionis larger than the outer diameter Dof the cooling portion.

In this implementation, the length Lof the cooling portionis larger than the outer diameter Dof the cooling portion, so as to facilitate recognition of a packing direction of the cooling portionbefore the cooling portionis packed into the tube. For example, if the length Lof the cooling portionis smaller than or equal to the outer diameter Dof the cooling portion, when the cooling portionis conveyed, it may be difficult to control a length direction of the cooling portionto be consistent with a conveyance direction of the cooling portion, or it may be necessary to additionally provide a direction recognition mechanism to recognize a direction of the cooling portion. As a result, the manufacturing efficiency of the heat-not-burn cartridgeis reduced, the packing of the cooling portionis easy to make a mistake, and specifically, both ends of the cooling portionface an inner wall of the tubewhen the cooling portionis packed into the tube. Therefore, the length Lof the cooling portionneeds to be larger than the outer diameter Dof the cooling portion. Specifically, Lsatisfies: 8 mm≤L≤10 mm, and Dsatisfies: 6.5 mm≤D≤6.8 mm.

In addition, in an implementation, a material of the cooling portionincludes at least one of poly(ether-ether-ketone) (PEEK), polyphenylene sulfone resins (PPSU), poly(ethylene imine) (PEI), polyamide (PA), polyoxymethylene (POM), or silica gel.

In this implementation, the material of the cooling portionis food-grade plastic, food-grade silica gel, or the like, and has a good heat resistance effect. Specifically, the cooling portionhas a heat resistance temperature of 270°-400°. When the aerosol produced by heating the smoke generating portionpasses through the cooling portion, the cooling portioncan absorb the heat of the aerosol, thereby achieving a good cooling effect. Specifically, the material of the cooling portionmay be, but is not limited to, one or more of PEEK, PPSU, PEI, PA, POM, or silica gel. When the cooling portionis made of a material such as plastic, the cooling portionis manufactured by an injection molding process. When the cooling portionis made of a material such as silica gel, the cooling portionis manufactured by a hot-press molding process.

Reference can be made to,,, and, whereis a schematic structural view of a heat-not-burn cartridge provided in another implementation of the present disclosure,is an exploded schematic perspective view of the heat-not-burn cartridge provided in the implementation in,is a schematic cross-sectional view of the heat-not-burn cartridge provided in the implementation intaken along line D-D, andis a partial enlarged schematic view of the heat-not-burn cartridge provided in the implementation inat circle I. In this implementation, the heat-not-burn cartridgeincludes a tube, a closing portion, a smoke generating portion, a cooling portion, and a filter portion. The tubehas a first endand a second endopposite to the first end. The closing portionis configured to seal the first end. The smoke generating portionis accommodated in the tubeand disposed adjacent to the first end. The cooling portionis accommodated in the tubeand disposed adjacent to the smoke generating portion. The filter portionis accommodated in the tubeand disposed at the second end. The filter portionis spaced apart from the cooling portionto define an accommodating cavity. In addition, in this implementation, the heat-not-burn cartridgefurther includes a package. The packagesurrounds the tube, and both ends of the packageare flush with both ends of the tube, respectively.

In this implementation, the packagecan surround the tubeand hide dirt, lines made by spiral wound, or the like on an outer surface of the tube. Specifically, a material of the packageis tipping paper, which may be but is not limited to tipping paper of 32 g/m-40 g/m. In addition, the packagemay surround the tubein a convolute-wound manner, so that an end surface of one end of the packageis flush with a surface of the closing portionaway from the first end, and an end surface of the other end of the packageis flush with a surface of the tubeat the second end. Specifically, a length Lof the packagesatisfies: 42 mm≤L≤46 mm, and an outer diameter Dof the packagesatisfies: 7.15 mm≤D≤7.3 mm.

Although embodiments of the present disclosure have been illustrated and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations to the present disclosure. Those of ordinary skill in the art can change, amend, replace, and modify the above embodiments within the scope of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the present disclosure.