CN112493558A

CN112493558A - Atomizing unit and atomizing device

Info

Publication number: CN112493558A
Application number: CN202011424394.5A
Authority: CN
Inventors: 汪小蝶
Original assignee: Shenzhen Huachengda Development Co Ltd
Current assignee: Shenzhen Huachengda Precision Industry Co Ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-03-16

Abstract

The invention discloses an atomizing unit and an atomizing device, wherein the atomizing unit comprises a reticular U-shaped heating sheet, a supporting and fixing seat with a central through hole, liquid guide cotton and a side sealing piece; the supporting fixing seat comprises a base and a supporting column body arranged on the base, and the central through hole penetrates through the supporting column body and the base; the side surface of the supporting column body is provided with a U-shaped notch; the U-shaped heating plate is arranged in the gap and is abutted against the base; the liquid guide cotton is wrapped on the outer side surface of the U-shaped heating sheet far away from the central through hole; the side sealing piece is matched in the notch, and the liquid guide cotton is fixed between the side sealing piece and the U-shaped heating sheet; the side seal piece is provided with at least one liquid guide hole communicated to the liquid guide cotton. In the invention, the heating body is supported and fixed on the supporting and fixing seat in a lateral assembly mode, and the liquid guide cotton and the heating body are fixed on the supporting and fixing seat through the lateral sealing piece, so that the heating body is ensured to be fully contacted with the liquid guide cotton and is prevented from being extruded and deformed; the thinning arrangement of the heating body is facilitated, and the material selection range is expanded.

Description

Atomizing unit and atomizing device

Technical Field

The invention relates to the technical field of atomization, in particular to an atomization unit and an atomization device.

Background

Liquid can be dispersed into smaller particles through heating atomization, so that liquid molecules are dispersed in space, the liquid is widely applied to industries such as medical treatment, agriculture, household appliances and electronic consumer goods, and the liquid can be atomized in the field of heating atomization due to the fact that the liquid is easy to achieve and is widely applied in recent years. The heating body is used as a heating body of a core part for heating and atomizing, and innovation is particularly important.

At present, the heating bodies most widely applied in the field of heating atomization are mainly divided into two types: one is a spiral heating body formed by a heating wire in a spiral manner, and the other is a net heating body. When the reticular heating body is assembled with the liquid guide cotton, the reticular heating body is mostly assembled at the inner ring of the liquid guide cotton and is attached with the liquid guide cotton to realize liquid guide heating.

However, the conventional mesh-shaped heating body has the following problems:

1. due to the requirements of circuits and heating areas, the hollowed heating circuit forms a circuitous heating circuit, so that the link point of the sheet heating body is smaller;

2. in order to increase the heating area, the heating circuit is circuitous to cause the frame part to be uneven without supporting force. The product has weak strength, is easy to cause poor deformation in the transportation and assembly processes, and is not beneficial to mass production;

3. because the supporting strength of the heating sheet is not enough, the attaching degree of the heating sheet and the liquid guide cotton is difficult to ensure, when the heating sheet is not in good contact with the liquid guide cotton, the heating sheet is easy to generate harmful substances by local position dry burning, and bad experience is brought to users; in addition, the size and the shape of the product are not well standardized during design;

4. the thickness of the heating sheet is limited by the strength, and the heating sheet cannot be thinned, so that the problems of large sectional area of a conductor and slow heat starting during electrifying are caused.

Disclosure of Invention

The invention aims to provide an atomization unit for improving the supporting strength of a reticular heating body and the fitting degree of the reticular heating body and liquid guide cotton, and an atomization device with the atomization unit.

The technical scheme adopted by the invention for solving the technical problems is as follows: providing an atomization unit, which comprises a reticular U-shaped heating sheet, a supporting fixed seat with a central through hole, liquid guide cotton and a side sealing piece;

the supporting fixing seat comprises a base and a supporting column body arranged on the base, and the central through hole penetrates through the supporting column body and the base; the side surface of the supporting column body is provided with a U-shaped notch;

the U-shaped heating plate is arranged in the notch and is abutted against the base; the liquid guide cotton is wrapped on the outer side face, far away from the central through hole, of the U-shaped heating sheet;

the side sealing piece is matched in the notch, and the liquid guide cotton is fixed between the side sealing piece and the U-shaped heating sheet; and the side sealing piece is provided with at least one liquid guide hole communicated to the liquid guide cotton.

Preferably, the U-shaped heating sheet comprises a U-shaped mesh heating sheet and electrode connecting portions respectively connected to opposite ends of the mesh heating sheet;

the upper side and the lower side of the mesh heating sheet are respectively provided with a plurality of convex supporting limiting ribs, the supporting limiting ribs positioned on the upper side face the inner top surface of the notch, and the supporting limiting ribs positioned on the lower side face the surface of the base.

Preferably, the upper side and the lower side in the gap are respectively provided with a limiting boss; the supporting limit ribs on the upper side and the lower side of the mesh heating sheet are respectively abutted against or embedded into the corresponding limit bosses.

Preferably, the mesh-shaped heating sheet is formed by connecting a plurality of transverse heating ribs and a plurality of vertical supporting ribs in a staggered manner; the two electrode connecting parts are respectively connected to two opposite ends of the transverse heating rib;

the transverse heating ribs are in a linear shape, a fold line shape or a wavy line shape.

Preferably, the atomizing unit further comprises two electrode pins;

the two electrode pins are inserted in the supporting fixed seat and are respectively in contact and electric connection with the two electrode connecting parts of the U-shaped heating sheet.

Preferably, the atomizing unit further comprises a supporting air guide member disposed in the central through hole;

the first end of the supporting air guide piece is positioned in the supporting column body, and the opposite second end of the supporting air guide piece is positioned in the base; an air guide through hole is formed in the supporting air guide piece, penetrates through the side wall and the second end of the supporting air guide piece, and an air guide outlet and an air guide inlet are formed in the side wall and the second end respectively; the central through hole is communicated with the air guide through hole through the air guide outlet.

Preferably, the second end of the supporting air guide member is matched with a port of the central through hole on the base.

The invention also provides an atomization device which comprises the atomization unit.

Preferably, the atomization device further comprises a cylindrical shell and a bottom shell;

the shell is internally provided with an air duct and a liquid storage bin surrounding the periphery of the air duct; the first end of the shell is provided with an air outlet communicated with the air guide pipe, and the second end of the shell is open; the bottom shell is matched at the second end of the shell to close the shell;

the atomizing unit is disposed within the second end of the housing; the central through hole on the atomization unit is communicated with the air guide pipe relatively, and the liquid guide hole on the atomization unit is communicated with the liquid storage bin.

Preferably, the bottom case is provided with a hole portion for exposing the electrode pin of the atomizing unit.

Preferably, the atomization device further comprises a seal seat which is arranged in the shell and covers the atomization unit;

a channel hole which is oppositely communicated with the central through hole is formed in one end, facing the air guide tube, of the sealing seat, and the end part of the air guide tube is inserted in the channel hole and is communicated with the central through hole through the channel hole;

the lateral wall of seal receptacle is equipped with the lateral wall through-hole that the drain hole communicates relatively, the stock solution storehouse passes through the lateral wall through-hole with the drain hole intercommunication.

According to the atomizing unit, the heating body is of a net-shaped U-shaped structure, is supported and fixed on the supporting and fixing seat in a lateral assembling mode, and the liquid guide cotton and the heating body are fixed on the supporting and fixing seat through the side sealing piece, so that enough supporting strength is formed for the net-shaped heating body, the sufficient contact between the net-shaped heating body and the liquid guide cotton is ensured, and the deformation of the net-shaped heating body due to the extrusion of the liquid guide cotton is avoided; in addition, the thinning arrangement of the heating body is facilitated, and the material selection range of the heating body is expanded.

Drawings

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

FIG. 1 is a schematic cross-sectional view of an atomizing device according to an embodiment of the present invention;

FIG. 2 is an exploded view of an atomizing device according to an embodiment of the present invention;

FIG. 3 is an exploded view of the atomizing unit of FIG. 2;

FIG. 4 is a schematic view of the assembly process of the support holder and the U-shaped heating plate of FIG. 3;

fig. 5 (1) to (3) are schematic structural views of three embodiments of the U-shaped heating sheet, respectively.

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.

As shown in fig. 1 and 2, an atomizing device according to an embodiment of the present invention includes a housing 1, a bottom case 2, and an atomizing unit 3.

The housing 1 is a hollow cylindrical structure and may include opposing first and second ends. The air duct 101 and the liquid storage bin 102 which are isolated from each other are arranged in the shell 1, the air duct 101 is located in the middle of the shell 1 and extends along the length direction of the shell 1, and the internal channel of the air duct 101 is an air duct. The liquid storage bin 102 surrounds the periphery of the air duct 101 and is used for storing tobacco juice. The first end of the shell 1 is provided with an air outlet 103 communicated with the air duct 101, and the second end of the shell 1 is open. The bottom case 2 is fitted to the second end of the housing 1 to close the end.

The atomizing unit 3 is disposed in the second end of the housing 1 and is located at one side of the air duct 101 and the reservoir 102, and the side of the reservoir 102 facing the second end of the housing 1 is closed to form a closed chamber with the reservoir 102. The bottom case 2 is supported below the atomizing unit 3.

As shown in fig. 1 to 3, the atomizing unit 3 includes a net-shaped U-shaped heating plate 10, a supporting fixing seat 20, a liquid guide cotton 30, and a side seal 40.

The supporting fixing seat 20 is used for supporting and fixing the U-shaped heating plate 10, and a central through hole 200 is formed in the supporting fixing seat 20, and the central through hole 200 penetrates through the entire supporting fixing seat 20 in the height direction. One end of the air duct 101 facing the atomizing unit 3 is oppositely communicated with the central through hole 200 to form an atomizing channel.

The supporting fixing seat 20 may include a base 21, a supporting column 22 disposed on the base 21; the central through hole 200 penetrates the support cylinder 22 and the base 21. The side of the supporting column 22 is provided with a U-shaped notch 23 for accommodating the U-shaped heating plate 10 and the liquid guiding cotton 30. The gap 23 occupies at least half of the sidewall area of the support column 22 so that the U-shaped heating plate 10 and the drainage wool 30 can be stably placed therein. With the arrangement of the notches 23, the support column 22 is a non-circular column, which may be a column with an oval or kidney-shaped cross section.

The supporting and fixing seat 20 is made of a high temperature resistant insulating material, such as PEEK, ceramic, nylon, LPC, etc.

The notches 23 are provided on the sides of the support column 22, the bottom of which extends above the surface of the base 21, and the top of which does not extend through the upper end of the support column 22, leaving an integral annular end at the upper end of the support column 22.

The U-shaped heating plate 10 is arranged in the notch 23 in a side embedding mode and is abutted against the base 21; the inner side of the U-shaped heating plate 10 faces the central through-hole 200. The liquid guide cotton 30 is wrapped on the outer side surface of the U-shaped heating plate 10 far away from the central through hole 100 and is tightly attached to the U-shaped heating plate, so that liquid guide heating is better.

The side seal 40 is fitted into the notch 23 to fix the liquid guide cotton 30 between the side seal 40 and the U-shaped heating plate 10, and the notch 23 is also filled and closed by fitting the liquid guide cotton 30 and the U-shaped heating plate 10. The side seal 40 is provided with at least one liquid guide hole 41 communicated with the liquid guide cotton 30. In the housing 1, the liquid guide hole 41 is communicated with the liquid storage bin 102, and the atomized liquid in the liquid storage bin 102 enters through the liquid guide hole 41 and is adsorbed on the liquid guide cotton 30. The size and number of the liquid guide holes 41 are set according to the liquid inlet requirement.

The liquid guide cotton 30 and the side seal 40 are also in a U-shaped structure corresponding to the arrangement of the U-shaped heating plate 10 and the notch 23. Preferably, after the side seal 40 is fitted in the notch 23, its outer side surface smoothly meets the side surface of the support cylinder 22 to form an integral cylinder with the support cylinder 22.

In order to improve the stability of the side seal 40 at the notch 23, at least one of the upper and lower sides of the side seal 40 is provided with at least one protruding buckle 42, so that the side seal 40 is positioned in the notch 23 in a buckling manner. Corresponding to the convex buckle 42, concave holes matched with the convex buckle 42 can be arranged on the surface of the base 21 positioned in the gap 23 and the inner top surface of the gap 23 (namely the inner end surface of the annular end part at the upper end of the supporting column 22).

Specifically, the U-shaped heating sheet 10 includes a U-shaped mesh heating sheet 11, and electrode connection portions 12 connected to opposite ends of the mesh heating sheet 11, respectively. The mesh heating plate 11 can be formed by bending a metal conducting plate after obtaining a mesh structure by cutting, etching and other modes, or formed by welding a plurality of transverse metal wires and vertical support ribs, or formed by weaving the metal wires in a graticule mode. The electrode connection part 12 may be integrally formed or welded at the end of the mesh-type heating sheet 11.

As shown in fig. 3 and 4, the upper and lower sides of the mesh-shaped heating sheet 11 can be respectively provided with a plurality of protruding supporting limiting ribs 13, the supporting limiting ribs 13 located on the upper side face the inner top surface of the notch 23 (i.e. the inner end surface of the annular end portion of the upper end of the supporting column 22), and the supporting limiting ribs 13 located on the lower side face the surface of the base 21 opposite to the base, so that the mesh-shaped heating sheet 11 is supported and positioned in the notch 23 by the supporting limiting ribs 13 located on the upper and lower sides, and the problem of insufficient supporting force due to the thinness of the mesh-shaped. When the U-shaped heating plate 10 is electrified to generate heat, the supporting limiting ribs 13 do not generate heat or the heat is extremely little, and the temperature of the heating plate is low relative to the mesh heating plate 11, so that the atomization effect is not influenced.

According to the needs, the support limiting rib 13 on the upper side faces the inner top surface of the notch 23 and can be embedded into the notch, and the support limiting rib 13 on the lower side faces the surface opposite to the base 21 and can be embedded into the notch, so that the stability is enhanced.

Corresponding to the supporting limiting ribs 13 on the upper and lower sides of the heating sheet 11, limiting bosses 231 are respectively arranged on the upper and lower sides in the gap 23, and the limiting bosses 231 are located between the periphery of the central through hole 200 and the inner side surface of the U-shaped heating sheet 10. The supporting limit ribs 13 on the upper and lower sides of the mesh heating sheet 11 are respectively abutted or embedded into the corresponding limit bosses 231. Spacing boss 231 and the cooperation that supports spacing muscle 13 not only can improve the stability of netted heating plate 11 in breach 23, solve netted heating plate 11 itself thin and the not enough problem of holding power, can also play limiting displacement to netted heating plate 11, with its spacing periphery at central through-hole 200, make netted heating plate 11 can bear the extrusion parcel and non-deformable of leading the cotton 30 of liquid simultaneously. The limiting bosses 231 on the upper and lower sides in the gap 23 can also be connected into a whole through a vertically arranged rod body 232.

Further, as shown in fig. 3 and 5, for the structural form of the mesh-shaped heating sheet 11, it may be formed by connecting a plurality of transverse heating ribs 111 and a plurality of vertical supporting ribs 112 in a staggered manner; the transverse heating rib 111 is in a linear shape, a zigzag shape, a wavy shape, or the like.

As shown in (1) of fig. 5, in the first embodiment of the mesh-shaped heating sheet 11, the plurality of transverse heating ribs 111 are linearly and parallelly spaced, the plurality of vertical supporting ribs 112 are parallelly spaced, and the plurality of transverse heating ribs 111 and the plurality of vertical supporting ribs 112 are vertically and alternately connected relatively to each other, so as to form the mesh-shaped heating sheet 11 with a square mesh. The supporting and limiting ribs 13 on the upper and lower sides of the mesh-shaped heating sheet 11 can be formed by extending the end parts of the vertical supporting ribs 112. Two electrode connecting portions 12 are respectively connected to opposite ends of the transverse heating rib 111.

As shown in (2) of fig. 5, in the second embodiment of the mesh-shaped heating sheet 11, the plurality of transverse heating ribs 111 are wavy and spaced in parallel, the plurality of vertical supporting ribs 112 are spaced in parallel, and the plurality of transverse heating ribs 111 and the plurality of vertical supporting ribs 112 are vertically and alternately connected to each other, so as to form the mesh-shaped heating sheet 11 having a curved grid. The supporting and limiting ribs 13 on the upper and lower sides of the mesh-shaped heating sheet 11 can be formed by extending the end parts of the vertical supporting ribs 112. Two electrode connecting portions 12 are respectively connected to opposite ends of the transverse heating rib 111.

As shown in (3) of fig. 5, in the third embodiment of the mesh-shaped heating sheet 11, a plurality of transverse heating ribs 111 are zigzag-shaped and spaced in parallel, and a plurality of vertical supporting ribs 112 are divided into a plurality of groups and distributed between every two adjacent transverse heating ribs 111; the vertical support ribs 112 between every two adjacent transverse heating ribs 111 are parallel and spaced, the two adjacent transverse heating ribs 111 are connected together, and the vertical support ribs 112 of the two groups of vertical support ribs which are adjacent up and down are staggered one by one, so that the grids on the mesh-shaped heating plate 11 are honeycomb-shaped. Two electrode connecting portions 12 are respectively connected to opposite ends of the transverse heating rib 111.

In the atomizing unit 3, the U-shaped heating plate 10 is fixed through the support that supports fixing base 20 cooperation side seal 40 etc. can keep closely laminating and ensure certain structural strength (non-deformable) with drain cotton 30, is favorable to making thin U-shaped heating plate 10, and the material selection scope is bigger.

The wrapping tightness of the liquid guide cotton 30 on the U-shaped heating plate 10 can be set according to the liquid supply requirement. For example, the wicking cotton 30 may be wrapped only on the surface of the mesh heating sheet 11 opposite thereto; or, the liquid guide cotton 30 wraps the surface of the mesh-shaped heating sheet 11 opposite to the surface and is partially embedded into the meshes of the mesh-shaped heating sheet 11, and wraps the lateral surfaces of the transverse heating ribs 111 and the vertical supporting ribs 112 in the meshes; or, the liquid guiding cotton 30 wraps the surface of the heating sheet 11 opposite to the surface and is partially embedded into the grid of the heating sheet 11, and wraps the lateral heating ribs 111 and the vertical supporting ribs 112 on the inner side of the grid and also protrudes to the surface of the heating sheet 11 opposite to the liquid guiding cotton 30.

Further, as shown in fig. 3 and 4, the atomizing unit 3 further includes two electrode pins 50, which are respectively connected to the two electrode connecting portions 12 of the U-shaped heating plate 10 in an electrically conductive manner, and the U-shaped heating plate 10 is externally connected to a power supply device through the electrode pins 50. The two electrode pins 50 are inserted into the supporting fixing base 20 and are respectively in contact and electrical connection with the two electrode connecting portions 12 of the U-shaped heating plate 10.

In order to increase the contact area between the electrode connection parts 12 and the electrode pins 50, the ends of the two electrode connection parts 12 are provided with extending parts 14 bent away from each other, and the electrode connection parts 12 are in contact electrical connection with the electrode pins 50 in a face-to-face manner through the extending parts 14.

The electrode pin 50 further may include a first pin section 51 and a second pin section 52 that meet. Corresponding to the electrode pin 50, the base 21 of the supporting and fixing base 20 is provided with a socket 211, and the socket 211 penetrates through two opposite surfaces (bottom surface and top surface) of the base 21 and is communicated with the notch 23. The first pin section 51 of the electrode pin 50 is fitted on the bottom surface of the base 21 facing away from the support cylinder 22; the second lead section 52 passes through the insertion hole 211 into the notch 23, and the extension portion 14 of the electrode connection portion 12 is covered between the second lead section 52 and the inner side surface of the support cylinder 22 facing the notch 23, and is electrically connected in contact with the extension portion 14.

As shown in fig. 3, in the present embodiment, the electrode pin 50 has an inverted L shape.

As shown in fig. 2, the bottom case 2 is provided with a hole 201 corresponding to the electrode pin 50 for exposing the electrode pin 50, so that the electrode pin 50 can be connected to an external power supply device. Preferably, each electrode pin 50 is exposed through one of the hole portions 201, and the two hole portions 201 are spaced apart from each other.

With reference to fig. 1 and 3, the atomizing unit 3 may further include a support air guide 60 disposed in the central through hole 200 of the support holder 20, as needed. The support air guide 60 is generally cylindrical and may include opposing first and second ends. The first end of the support air guide 60 is located in the support column 22 and the second end is located in the base 21.

An air guide through hole 61 is formed in the supporting air guide 60, the air guide through hole 61 penetrates through the side wall and the second end of the supporting air guide 60, and an air guide outlet 611 and an air guide inlet (not shown) are formed on the side wall and the second end respectively; the central through hole 200 is communicated with the air guide through hole 61 through the air guide outlet 611, and is communicated with the outside air through the air guide inlet to realize ventilation. The supporting air guide 60 and the air guide through holes 61 on the supporting air guide 60 are arranged, so that the air flow which vertically rises into the supporting air guide 60 changes the direction and enters the central through hole 200 in a transverse or oblique mode, and atomized condensate is not easy to leak from the air guide inlet.

Preferably, the second end of the supporting air-guide 60 is adapted to the port of the central through-hole 200 on the base 21, so that the port of the central through-hole 200 on the base 21 is closed, leaving only the air-guide inlet to be vented to the outside.

The support air guide 60 may be manufactured separately and assembled with the support holder 20, or may be formed integrally with the support holder 20.

The bottom case 2 is provided with an air inlet communicated with the air inlet of the support air guide 60, so that the air outlet 103, the air guide pipe 101, the central through hole 200, the air guide through hole 61 and the air inlet are sequentially communicated to form an integrated atomizing passage, and the air flows as shown by arrows in fig. 1.

Further, as shown in fig. 1 and 2, the atomization device of the present invention further includes a sealing seat 4 disposed in the housing 1 and covering the atomization unit 3, so as to seal and isolate the atomization channel from the reservoir 102.

The sealing seat 4 is made of an insulating material such as silicon gel having elastic deformation.

One end of the sealing seat 4 facing the air duct 101 is provided with a channel hole 401 oppositely communicated with the central through hole 200, and the end of the air duct 101 is inserted into the channel hole 401 and communicated with the central through hole 200 through the channel hole 401. The side wall of the sealing seat 4 is provided with a side wall through hole 402 which is oppositely communicated with the liquid guide hole 41, and the liquid storage bin 102 is communicated with the liquid guide hole 41 through the side wall through hole 402.

When the atomization device is assembled, atomized liquid can be injected into the liquid storage bin 102 of the shell 1, the seal seat 4 is sleeved on the atomization unit 3, the seal seat 4 and the atomization unit 3 are installed in the shell 1 together to seal the liquid storage bin 102, and finally the bottom shell 2 is installed to form the integral atomization device.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An atomization unit is characterized by comprising a reticular U-shaped heating plate (10), a supporting fixed seat (20) with a central through hole (200), a liquid guide cotton (30) and a side sealing piece (40);

the supporting and fixing seat (20) comprises a base (21) and a supporting column body (22) arranged on the base (21), and the central through hole (200) penetrates through the supporting column body (22) and the base (21); the side surface of the supporting column body (22) is provided with a U-shaped notch (23);

the U-shaped heating sheet (10) is arranged in the notch (23) and is abutted against the base (21); the liquid guide cotton (30) is wrapped on the outer side face, far away from the central through hole (200), of the U-shaped heating sheet (10);

the side seal (40) is matched in the notch (23) to fix the liquid guide cotton (30) between the side seal (40) and the U-shaped heating plate (10); the side seal piece (40) is provided with at least one liquid guide hole (41) communicated to the liquid guide cotton (30).

2. The atomizing unit according to claim 1, characterized in that the U-shaped heating sheet (10) comprises a U-shaped mesh-shaped heating sheet (11), electrode connecting portions (12) respectively connected to opposite ends of the mesh-shaped heating sheet (11);

the upper side and the lower side of the mesh heating sheet (11) are respectively provided with a plurality of convex supporting limiting ribs (13), the supporting limiting ribs (13) positioned on the upper side face the inner top surface of the notch (23), and the supporting limiting ribs (13) positioned on the lower side face the surface of the base (21).

3. The atomizing unit according to claim 2, characterized in that the upper and lower sides in the notch (23) are respectively provided with a limit boss (231); the supporting limit ribs (13) on the upper side and the lower side of the mesh heating sheet (11) are respectively abutted or embedded into the corresponding limit bosses (231).

4. The atomizing unit according to claim 2, characterized in that the mesh-like heating sheet (11) is formed by connecting a plurality of transverse heating ribs (111) and a plurality of vertical supporting ribs (112) in a staggered manner; the two electrode connecting parts (12) are respectively connected to two opposite ends of the transverse heating rib (111);

the transverse heating ribs (111) are in a linear shape, a fold line shape or a wavy line shape.

5. The atomizing unit according to claim 2, characterized in that it further comprises two electrode pins (50);

the two electrode pins (50) are inserted in the supporting and fixing seat (20) and are respectively in contact and electric connection with the two electrode connecting parts (12) of the U-shaped heating sheet (10).

6. The atomizing unit according to any one of claims 1 to 5, characterized in that it further comprises a supporting air guide (60) disposed inside said central through hole (200);

a first end of the supporting air guide (60) is positioned in the supporting column (22), and a second opposite end is positioned in the base (21); an air guide through hole (61) is formed in the supporting air guide piece (60), the air guide through hole (61) penetrates through the side wall and the second end of the supporting air guide piece (60), and an air guide outlet (611) and an air guide inlet are formed in the side wall and the second end respectively; the central through hole (200) is communicated with the air guide through hole (61) through the air guide outlet (611).

7. The atomizing unit according to claim 6, characterized in that the second end of the supporting air guide (60) is adapted to the port of the central through hole (200) on the base (21).

8. An atomisation device characterized in that it comprises an atomisation unit (3) according to any of the claims 1-7.

9. Nebulising device according to claim 8, characterized in that it further comprises a cylindrical outer casing (1), a bottom shell (2);

an air duct (101) and a liquid storage bin (102) surrounding the periphery of the air duct (101) are arranged in the shell (1); an air outlet (103) communicated with the air guide pipe (101) is formed in the first end of the shell (1), and the second end of the shell (1) is open; the bottom shell (2) is matched at the second end of the shell (1) to close the shell;

the atomizing unit (3) is arranged in the second end of the housing (1); the central through hole (200) on the atomization unit (3) is communicated with the air guide pipe (101) relatively, and the liquid guide hole (41) on the atomization unit (3) is communicated with the liquid storage bin (103).

10. The atomizing device according to claim 9, characterized in that the bottom case (2) is provided with a hole portion (201) for exposing the electrode pin (50) of the atomizing unit (3).

11. Nebulising device according to claim 9, characterized in that it also comprises a sealing seat (4) provided inside the casing (1) and covering the nebulising unit (3);

a channel hole (61) which is oppositely communicated with the central through hole (200) is formed in one end, facing the air guide pipe (101), of the sealing seat (4), and the end part of the air guide pipe (101) is inserted into the channel hole (61) and is communicated with the central through hole (200) through the channel hole (61);

the side wall of the sealing seat (4) is provided with a side wall through hole (611) which is oppositely communicated with the liquid guide hole (41), and the liquid storage bin (102) is communicated with the liquid guide hole (41) through the side wall through hole (611).