TW202119945A - Atomizing unit and non-combustion heating type flavor inhaler - Google Patents

Abstract

The purpose of the present invention is to prevent droplets formed by condensing of aerosol in an aerosol flow path from reaching user's mouth. An atomizing unit includes: an atomizing portion; a tank; and a wall portion which defines at least a part of an aerosol flow path. At least a part of the wall portion constitutes a part of a side wall of the tank. The aerosol flow path includes: a first aerosol flow path, and a second aerosol flow path. The atomizing unit has a liquid retreat portion provided in the second aerosol flow path, and extends from the boundary of the first aerosol flow path and the second aerosol flow path toward the downstream of the second aerosol flow path. The wall portion has a plane portion parallel to a second direction orthogonal to a first direction at the boundary between the first aerosol flow path and the second aerosol flow path, and the liquid retreat portion includes a space defined by the plane portion. The ratio of the cross-sectional area of the second aerosol flow path and the liquid retreat portion in the second direction to the cross-sectional area of the first aerosol flow path in the second direction is more than 1 and 4.0 or less.

Description

Atomization unit and non-combustion heating type aroma inhalation device

The invention relates to an atomization unit and a non-combustion heating type fragrance inhalation appliance.

In the past, there has been known a flavor inhalation device that does not use burning materials to absorb flavors. An example of this kind of fragrance inhalation device is to supply the mist produced by atomizing a liquid containing fragrance (aerosol (also known as aerosol) source) into the mouth of the user, or to atomize a liquid without fragrance. The generated mist is passed through a flavor source (for example, a tobacco source) and then the mist is supplied to the mouth of the user.

Generally speaking, such a flavor inhalation appliance is equipped with an atomization unit, a power supply, a tank, a mist flow path, a mouthpiece, and the like. The atomization unit includes a heating element that atomizes the mist source and the like. The power supply is constructed by supplying power to the atomization unit. The storage tank is for storing the mist source. The mist flow path is a flow path through which the mist generated by atomizing the mist source through the atomizing unit passes. The mist after passing through the mist flow path will reach the mouth of the user through the cigarette holder.

[Prior Technical Literature]

[Patent Literature]

Patent Document 1: European Patent No. 3158883

When the above-mentioned fragrance inhalation device is used, the mist generated from the atomization unit may condense on the wall surface defining the mist flow path to form droplets. When the fragrance inhalation appliance is further used, the droplets that have condensed in the mist flow path may accumulate in a columnar shape. The columnar droplets will move to the side of the cigarette holder along with the taste of the user's flavor inhalation device, and reach the user's mouth, which may cause the user's discomfort.

Patent Document 1 discloses an electronic cigarette for inhaling mist. The electronic cigarette disclosed in Patent Document 1 disposes a porous body in the mist flow path to absorb the liquid that has condensed on the mist flow path.

The present invention was developed in view of the above-mentioned conventional problems, and its purpose is to prevent the droplets formed by the mist condensing on the mist flow path from reaching the mouth of the user.

According to one aspect of the present invention, an atomization unit is provided. The atomization unit has: an atomization part, which is configured to atomize the mist source; a storage tank, which holds the aforementioned mist source; and a wall part, which is designed for passing the mist generated by the aforementioned mist source through atomization and At least a part of the mist flow path extending in the first direction. At least a part of the aforementioned wall constitutes a part of the side wall of the aforementioned storage tank. The mist flow path system has: a first mist flow path; and a second mist flow path communicating with the downstream side of the first mist flow path. The atomization unit further has a liquid retreat part, the liquid retreat part is provided in the second mist flow path, and from the junction of the first mist flow path and the second mist flow path toward the downstream of the second mist flow path extend. The wall portion has a flat surface parallel to the second direction orthogonal to the first direction at the junction of the first mist flow path and the second mist flow path, and the liquid retreating portion includes the flat surface. The space delineated. The ratio of the cross-sectional area of the second mist flow path and the liquid retreating portion in the second direction to the cross-sectional area of the first mist flow path in the second direction is more than 1 and 4.0 or less.

According to another aspect of the present invention, a non-combustion heating type flavor inhalation device is provided. The non-combustion heating type flavor inhalation appliance has: the above-mentioned atomizing unit; and a power source for supplying electric power to the above-mentioned atomizing part.

10: Cartridge

12: Vent

14: Atomization Department

14a: wick

14b: Coil

14c: electrical contact

16: Atomizing part fixing member

18: Cigarette holder

20: Cover

30: storage tank

30a: Upper wall

30b: bottom wall

30c: Outer wall

32: Fog air path

32a: The first fog flow path

32b: Second fog flow path

33: Atomization chamber

34: inner wall

34a: Wall of the first mist flow path

34b: Wall of the second mist flow path

36: Protruding part

40: Plane

42: Slit

42a: corner

50: cover member

52: top plate

54: side panel

56: Opening

58: Protruding part

60: shell

90: Power Supply Department

92: power supply

100: Non-combustion heating type aroma inhaler

H: height

S1: Space

W: width

Figure 1 is an overall perspective view of the non-combustion heating type flavor inhaler of this embodiment.

Figure 2 is an exploded perspective view of the cartridge shown in Figure 1.

Figure 3 is a schematic side sectional view of the storage tank shown in Figure 2.

Figure 4A is a top view of the inner wall of the tank shown in Figure 3.

Fig. 4B is a side sectional view of the inner wall of the storage tank in the arrow direction view B-B in Fig. 4A.

Figure 4C is a top view of the inner wall of another embodiment of the storage tank.

Figure 4D is a top view of the inner wall of another embodiment of the storage tank.

Fig. 4E is a side sectional view of the inner wall of the storage tank of another embodiment.

Fig. 4F is a side cross-sectional view of the inner wall of the storage tank of another embodiment.

Fig. 5A is a schematic side sectional view showing another embodiment of the storage tank.

Fig. 5B is a schematic side sectional view showing another embodiment of the storage tank.

Figure 6 is a top view of the inner wall of the storage tank used in Experimental Example 1.

FIG. 7A is a schematic view showing an inner wall portion having an outer surface shape that does not correspond to the shape of the second mist flow path and the liquid retreating portion.

FIG. 7B is a schematic view showing an inner wall portion having an outer surface shape that does not correspond to the shape of the second mist flow path and the liquid retreating portion.

FIG. 7C is a schematic view showing an inner wall portion having an outer surface shape corresponding to the shape of the second mist flow path and the liquid retreating portion.

FIG. 7D is a schematic diagram showing an inner wall portion having an outer surface shape corresponding to the shape of the second mist flow path and the liquid retreating portion.

Figure 8 is a graph showing the evaluation result of Experimental Example 2.

Fig. 9 is a schematic side sectional view of a storage tank of a non-combustion heating type flavor inhaler of another embodiment.

Fig. 10A is a perspective view of the cover member.

Figure 10B is a plan view of the cover member.

Fig. 10C is a cross-sectional view of the arrow direction view 10C-10C shown in Fig. 10B.

Fig. 11 is a schematic side sectional view of a storage tank provided with a cover member of another embodiment.

Fig. 12 is a schematic top view of the storage tank of the non-combustion heating type flavor inhaler of yet another embodiment.

The following describes the implementation of the present invention with reference to the drawings. In the drawings to be described below, the same or equivalent constituent elements are given the same symbols and repeated descriptions are omitted.

Figure 1 is an overall perspective view of the non-combustion heating type flavor inhaler of this embodiment. As shown in FIG. 1, the non-combustion heating type flavor inhaler 100 has a power supply unit 90 that is reused, and a cartridge 10 that can be attached to the power supply unit 90. The power supply unit 90 has a power supply 92 therein, and the power supply 92 is configured to supply electric power to the cartridge 10 attached to the power supply unit 90. The cartridge 10 has a vent 12 at its front end. The user can inhale the mist generated in the non-combustion heating type fragrance inhaler 100 from the vent 12.

FIG. 2 is an exploded perspective view of the cartridge 10 shown in FIG. 1. FIG. In addition, in this specification, the side facing the power supply unit 90 in the state where the cartridge 10 is mounted on the power supply unit 90 may be referred to as the "rear end of the cartridge 10". In addition, the side opposite to the rear end of the cartridge 10 may be referred to as the "front end of the cartridge 10". In addition, the direction connecting the rear end and the front end of the cartridge 10 is sometimes referred to as the "first direction", and the direction orthogonal to the first direction is sometimes referred to as the "second direction".

The cartridge 10 has a storage tank 30, an atomization part 14, an atomization part fixing member 16, a cigarette holder 18 and a cap 20. The storage tank 30 maintains a mist source containing water, glycerin, propylene glycol, and the like inside. In addition, the storage tank 30 is provided with an atomization chamber 33 at a position close to the rear end in the first direction. The atomizing unit 14 is configured to atomize the mist source supplied from the storage tank 30. In this embodiment, as described later with respect to Fig. 3, the atomizing part 14 is a coil formed by winding a resistance heating element around a cylindrical wick made of glass fiber or the like. Formed. As described later with respect to FIG. 3, the atomizing part 14 is equipped with electrical contacts. When the cartridge 10 is mounted on the power supply unit 90, the electrical contacts between the electrode terminals of the power supply unit 90 and the atomization unit 14 are conducted, and power can be supplied from the power supply unit 90 to the atomization unit 14.

In order to supply the mist source to the resistance heating element, in addition to the cylindrical liquid absorbent core composed of glass fiber etc., the atomizing part 14 can also be used, for example, the absorbent composed of organic fiber (cellulose (cellulose), etc.). Liquid wicks, or porous bodies such as flat or cylindrical ceramics are used as liquid wicks. In addition, as the resistance heating element, for example, metals such as Nichrome or stainless steel, or non-metals such as carbon can be used. When aspirating When the core is cylindrical, the heating resistor system can be wound into a coil shape, and it can also be arranged along the cylindrical liquid absorbent core. When the liquid wick is in the shape of a flat plate, the resistance heating system can be arranged linearly on the plane of the liquid wick, or in a serpentine shape. The atomizing part 14 may also be configured to replace the resistance heating element to atomize the mist source by ultrasonic or induction heating. The cartridge 10 may also have a plurality of atomization parts 14. The atomization chamber 33 is not limited to a position close to the rear end of the storage tank 30 in the first direction, and may also exist at any position in the storage tank 30 or outside the storage tank 30. In addition, the atomization chamber 33 may also be defined by components that can be detached from the storage tank 30.

The cover 20 is installed at the rear end of the storage tank 30 in the first direction to protect the atomization chamber 33 of the storage tank 30 and is removed when the cartridge 10 is used. The atomization part fixing member 16 is fixed in the atomization chamber 33 of the storage tank 30 while holding the atomization part 14. Thereby, a part of the liquid wick of the atomizing part 14 is in contact with the mist source held in the storage tank 30, and the mist source is supplied to the liquid wick. The cigarette holder 18 is installed at the front end of the storage tank 30 in the first direction. In addition, the cigarette holder 18 is provided with the vent 12 shown in FIG. 1.

Fig. 3 is a schematic side sectional view of the storage tank 30 shown in Fig. 2. In Fig. 3, the atomizing part fixing member 16 shown in Fig. 2 is omitted. As shown in the figure, the storage tank 30 has: an upper wall portion 30a at the front end in the first direction; a bottom wall portion 30b at the rear end in the first direction; and an outer wall portion 30c constituting the outer peripheral surface of the storage tank 30. Moreover, the storage tank 30 is equipped with the inner wall part 34 (corresponding to an example of a wall part) which delimits at least a part of the mist flow path 32. That is, the storage tank 30 uses the inner wall portion 34 to define the mist flow path 32 extending in the first direction between the rear end and the front end of the storage tank 30 at the substantially central part of the inside of the storage tank 30. In this specification, the outer wall portion 30c and the inner wall portion 34 of the storage tank 30 constitute the side walls of the storage tank 30, and may also be referred to as side walls. In addition, in this specification, the side wall of the storage tank 30 refers to a wall that has the function of keeping the mist source in the storage tank 30 together with the upper wall portion 30a and the bottom wall portion 30b of the storage tank 30, and may not be combined with the storage tank 30. The upper wall portion 30a or the bottom wall portion 30b of the groove 30 is integrally formed. In addition, in this embodiment, the mist flow path 32 is defined by The inner wall portion 34 constitutes a part of the side wall of the storage tank 30. It is not limited to this, and at least a part of the mist flow path 32 may be defined by a wall formed by another member different from the side wall of the storage tank 30.

As shown in the figure, the atomization part 14 is fixed in the atomization chamber 33 of the storage tank 30. Specifically, the atomizing part 14 includes a cylindrical liquid wick 14a and a coil 14b wound around the liquid wick 14a, and is arranged in the atomization chamber 33 such that the liquid wick 14a extends in the second direction . The liquid absorbent core 14a absorbs and retains the mist source held in the storage tank 30. The atomizing unit 14 further includes an electrical contact 14c for supplying electric power to the coil 14b. When the cartridge 10 is attached to the power supply unit 90 shown in FIG. 1, the contact of the power supply unit 90 and the electrical contact 14c shown in FIG. 3 are conducted, and power is supplied from the power supply unit 90 to the coil 14b.

When electric power is supplied to the coil 14b, the coil 14b generates heat and atomizes the mist source held in the liquid wick 14a to generate mist. The mist generated in the atomization chamber 33 is accompanied by the user's inhalation, passes through the mist flow path 32, and reaches the mouth of the user through the vent 12 of the cigarette holder 18. Therefore, the storage tank 30 and the atomizing part 14 function as an atomizing unit that atomizes the mist source.

In summary, when the non-combustion heating type flavor inhaler 100 is used, the mist generated from the atomizing portion 14 will condense on the wall surface of the inner wall portion 34 that delimits the mist flow path 32 to form a liquid The situation of drops. When the non-combustion heating type flavor inhalation device 100 is further used, the droplets condensed in the mist flow path 32 may accumulate in a columnar shape. The columnar droplets move to the side of the cigarette holder 18 along with the user's non-combustion heating type flavor inhalation device 100 to reach the user's mouth, which may cause discomfort to the user.

Therefore, the non-combustion heating type flavor inhaler 100 of this embodiment has a liquid retreating portion for retreating the liquid droplets condensed on the inner wall portion 34 from the mist flow path 32. Fig. 4A is a top view of the inner wall portion 34 of the storage tank 30 shown in Fig. 3. Figure 4B is the arrow direction view of Figure 4A. B- A side sectional view of the inner wall portion 34 of the storage tank 30 in B. In FIGS. 4A and 4B, only the inner wall portion 34 of the storage tank 30 is selected for display.

As shown in FIGS. 4A and 4B, the mist flow path 32 defined by the inner wall portion 34 has: a first mist flow path 32a; and a second mist flow path 32b, which is connected to the first mist flow path 32a The downstream side (that is, the front end) communicates with each other. In other words, the inner wall portion 34 has: a first mist flow path wall portion 34a that defines at least a part of the first mist flow path 32a; and a second mist flow path wall portion 34b that defines the second mist flow path 32b At least part of. In this embodiment, the first mist flow path wall portion 34a and the second mist flow path wall portion 34b respectively constitute a part of the side wall of the storage tank 30. It is not limited to this, and only the second mist flow path wall portion 34b may constitute at least a part of the side wall of the storage tank 30, and the first mist flow path wall portion 34a may be composed of a wall member different from the side wall of the storage tank 30 , And located outside the storage tank 30.

As shown in FIG. 4A, in this embodiment, the cross-sectional shape of the first mist flow path 32a and the second mist flow path 32b in the second direction is circular. In addition, in this embodiment, the cross-sectional shape of the first mist flow path 32a in the second direction is the same as the cross-sectional shape of the second mist flow path 32b in the second direction. Furthermore, in this embodiment, the cross-sectional shape and cross-sectional area of the first mist flow path 32a and the second mist flow path 32b are constant in the first direction. That is, the first mist flow path 32a and the second mist flow path 32b do not change the cross-sectional shape and the cross-sectional area along the longitudinal direction.

As shown in Figure 4B, the inner wall portion 34 is located at the junction of the first mist flow path 32a and the second mist flow path 32b, and has a flat surface 40 parallel to the second direction, and a flat surface 40 extending from the flat surface 40 toward the front end. A pair of slits 42. The flat portion 40 and the slit 42 are located further outside in the second direction than the second mist flow path 32b. As shown in FIG. 4A, in this embodiment, the inner wall portion 34 is provided with a pair of slits 42 so as to sandwich the second mist flow path 32b. Not limited to this, the inner wall portion 34 may also be provided with one or more than three slits 42. As shown in FIG. 4A, the inner wall portion 34 includes a corner portion 42a that forms a slit 42 when viewed from the first direction. As shown in Fig. 4A, the front end of the slit 42 is open.

與一對細縫42之深度的長度，細縫42的高度H係指細縫42之厚度方向的長度。 In addition, in this specification, as shown in Fig. 4A, the width W refers to the diameter including the second mist flow path 32b

The height H of the slit 42 refers to the length of the slit 42 in the thickness direction.

The cross-sectional shape of the slit 42 in the second direction is not limited to the shape shown in FIG. 4A. 4C and 4D are top views of the inner wall portion 34 of the storage tank 30 in another embodiment. In the example shown in FIG. 4C, the cross-sectional shape of the corner 42a of the slit 42 in the second direction is formed in a circular arc shape. That is, the corner 42a includes not only the 90-degree corner 42a but also the arc-shaped corner 42a. In addition, in the example shown in 4D, the cross-sectional shape of the slit 42 in the second direction is formed in a semicircular shape. The slit 42 is not limited to the cross-sectional shape shown in FIG. 4A, FIG. 4C, and FIG. 4D, and may have any cross-sectional shape including a polygon such as a triangle or the like.

When the non-combustion heating type flavor inhaler 100 is used, the mist generated from the atomizing portion 14 passes through the first mist flow path 32a and the first mist flow path 32a defined by the inner wall portion 34 shown in FIGS. 4A and 4B. The second mist flow path 32b. At this time, the mist may condense on the wall surface of the first mist flow path wall portion 34a or the second mist flow path wall portion 34b to form droplets.

When the droplets continue to condense on the wall surface of the first mist flow path wall portion 34a and/or the second mist flow path wall portion 34b, the droplets will accumulate and block the first mist flow path 32a. As a result, the droplets may be in the first mist flow path 32a. The inside of a mist flow path 32a is formed in a columnar shape. The columnar droplets move toward the cigarette holder 18 side, that is, the second mist flow path 32b side, along with the user's inhalation of the non-combustion heating type flavor inhalation device 100. Here, when the columnar droplets reach the second mist flow path 32b, a part of the droplets will retreat to the plane portion 40 formed at the junction of the first mist flow path 32a and the second mist flow path 32b. Fixed space. Because the air is not easy to be on the plane Since the space near the portion 40 flows, the flow velocity of the air passing through the flat portion 40 is smaller than the flow velocity of the second mist flow path 32b. Therefore, the liquid droplet that has evacuated to the space defined by the plane portion 40 is unlikely to move to the cigarette holder 18 side, so that the liquid droplet can be prevented from reaching the user's mouth. That is, the space defined by the flat surface portion 40 functions as a part of the liquid retreating portion for retreating the agglomerated liquid droplets from the second mist flow path 32b.

In addition, the columnar droplets reaching the second mist flow path 32b also retreat to the inside of the slit 42 extending from the flat portion 40. In this way, the droplet is no longer columnar, and will be located inside the slit 42, that is, in the space delimited by the slit 42. In summary, the slit 42 is provided with the corner 42a, and therefore the droplet is held at the corner 42a of the slit 42 by capillary action. The slit 42 is located further outside in the second direction than the first mist flow path 32a and the second mist flow path 32b. Therefore, the flow velocity of the air passing through the slit 42 is smaller than the flow velocity of the second mist flow path 32b. Therefore, the liquid droplet that has escaped to the space defined by the slit 42 is unlikely to move to the cigarette holder 18 side, so that the liquid droplet can be prevented from reaching the user's mouth. That is, the space defined by the slit 42 functions as a liquid retreating portion for the agglomerated liquid droplets to retreat from the second mist flow path 32b.

In order to prevent the liquid droplets from accumulating in the mist flow path 32 in a columnar shape, it may be considered to increase the width or diameter of the mist flow path 32 over the entire length of the mist flow path 32. On the other hand, the mist flow path 32 may be arranged to extend to the side or inside of the storage tank 30 as in the present embodiment. At this time, when the width or diameter of the mist flow path 32 is increased throughout the entire length of the mist flow path 32, the space of the storage tank 30 will also decrease accordingly, so the volume of the storage tank 30 storing the mist source is reduced. In response to this point, the non-combustion heating type flavor inhalation appliance 100 of this embodiment is equipped with a liquid retreat part, which is provided in the second mist flow path 32b and is separated from the first mist flow path 32a and the second mist flow path 32b. The boundary of the flow path 32b extends toward the downstream of the second mist flow path 32b. Specifically, in the present embodiment, the non-combustion heating type flavor inhaler 100 is provided with The space defined by the slit 42, especially the space defined by the corner 42a serves as the liquid retreating portion. In particular, the space defined by the corner portion 42a has excellent liquid holding ability due to the capillary force, so that the liquid that has reached the liquid retreating portion can be prevented from forming columnar droplets again in the first mist flow path 32a. Therefore, compared to the case where the width or diameter of the mist flow path 32 is increased throughout the entire inner wall portion 34 in the first direction, the reduction in the volume of the tank 30 can be suppressed, and the droplets can be prevented from reaching the user. In the mouth. In addition, in this embodiment, there is no need to provide a separate component in the storage tank 30 to prevent the droplets from reaching the mouth of the user. Thereby, it is possible to suppress the increase in the cost of the components or the influence caused by the additional installation of the components.

In this embodiment, although the plane portion 40 is parallel to the second direction, it is not limited to this. 4E and 4F are side cross-sectional views of the inner wall portion 34 of the storage tank 30 of another embodiment. In the example shown in FIG. 4E and FIG. 4F, the flat surface portion 40 is provided obliquely with respect to the second direction. Specifically, the plane portion 40 shown in FIG. 4B extends at right angles to the first mist flow path wall portion 34a. In contrast, in the example shown in FIG. 4E, the plane portion 40 is opposite to the first mist flow path wall portion 34a. A mist flow path wall portion 34a extends at an obtuse angle. In other words, in the example shown in FIG. 4E, the flat portion 40 extends from the first mist flow path wall portion 34a toward the mouthpiece 18 side. Moreover, in the example shown in FIG. 4F, the flat surface part 40 is extended so that it may incline at an acute angle with respect to the 1st mist flow path wall part 34a. In other words, in the example shown in FIG. 4F, the flat portion 40 extends from the first mist flow path wall portion 34a toward the side opposite to the cigarette holder 18. In the example shown in FIG. 4F, the concave space S1 is determined by the flat portion 40 and the slit 42. This concave space S1 constitutes a part of the liquid retreating portion, and is excellent in liquid holding ability due to capillary force. Therefore, the concave space S1 can prevent the liquid reaching the space S1 from forming columnar droplets again in the first mist flow path 32a.

In this embodiment, the mist flow path 32 is configured to extend to the center of the interior of the storage tank 30. Not limited to this, the mist flow path 32 may be provided on the side of the storage tank 30, and the outer wall portion 30 c of the storage tank 30 functions as a wall portion defining at least a part of the mist flow path 32. Figures 5A and 5B show another implementation A schematic side cross-sectional view of the storage tank 30 of the type. In the example shown in FIG. 5A, a storage tank 30 and an atomizing part 14 are housed in a housing 60, and a mist air flow path 32 is formed on one side of the storage tank 30. In the example shown in FIG. 5B, the storage tank 30 and the atomizing part 14 are housed in the housing 60, and mist air flow paths 32 are formed on both sides of the storage tank 30. The arrows A1 and A2 in FIGS. 5A and 5B show the flow of air or mist through the housing 60.

<Experimental example 1>

An experiment was conducted to evaluate the amount of droplets (the amount of droplets that reached the mouth of the user) corresponding to the shape of the liquid retreating portion. FIG. 6 is a top view of the inner wall portion 34 of the storage tank 30 used in Experimental Example 1. FIG. In this experiment, it was measured that a predetermined amount of liquid was injected into the first mist flow path 32a defined by the inner wall portion 34 of Example 1 to Example 9 shown in Fig. 6 to make it a columnar shape, and The amount of liquid scattered from the second mist flow path 32b to the front end of the inner wall portion 34 when inhaled under a predetermined condition.

係設為2mm。在以第4A圖所示方式定義細縫42與第二霧氣流路壁部34b之寬度W及細縫42的高度H時，實施例1至實施例9的寬度W及高度H係如下所述。 In the inner wall portion 34 of Examples 1 to 9, the length of the first mist flow path 32a in the first direction is set to 10 mm, and the length of the second mist flow path 32b and the slit 42 in the first direction is set to 10 mm. The length is set to 20mm. In addition, the diameters of the first mist flow path 32a and the second mist flow path 32b

The system is set to 2mm. When the width W of the slit 42 and the second mist flow path wall portion 34b and the height H of the slit 42 are defined in the manner shown in FIG. 4A, the width W and height H of Examples 1 to 9 are as follows .

Example 1: Width W=6mm, Height H=2mm

Example 2: Width W=6mm, Height H=1mm

Example 3: Width W=6mm, Height H=0.6mm

Example 4: Width W=4mm, Height H=2mm

Embodiment 5: width W=4mm, height H=1mm

Embodiment 6: width W=4mm, height H=0.6mm

Embodiment 7: width W=3mm, height H=2mm

Embodiment 8: width W=3mm, height H=1mm

Embodiment 9: width W=3mm, height H=0.6mm

為小。 That is, the cross-sectional shape of the second mist flow path 32b and the liquid retreating portion (slit 42) in the second direction of Examples 1, 4, and 7 is square as a whole. In addition, in Examples 2, 3, 5, 6, 8, and 9, the height H of the slit 42 is larger than the diameter of the second mist flow path 32b in the second direction.

For small.

In addition, the storage tank 30 provided with the inner wall part 34 which does not have a liquid retreat part is made into the comparative example 1. That is, the inner wall portion 34 of Comparative Example 1 does not have the slit 42 and the flat portion 40, and has the same shape as that of Examples 1 to 9 except for the above.

The inhalation conditions are as follows.

Absorption capacity: 2400cc/min

Inhalation time: 3 seconds

Number of puffs: 1 time

N number (sample size): 3

The direction of the storage tank 30 (the angle of the first direction): inclined 45 degrees with respect to the vertical

Liquid composition: glycerin: propylene glycol: water=45:45:10

Liquid injection volume: 40μl

The results of the experiment under the above conditions are shown in Table 1.

[Table 1]

In Table 1, the area of the liquid retreat portion is the cross-sectional area of the slit 42 in the second direction, and does not include the cross-sectional area of the second mist flow path 32b. In addition, in Table 1, (the area of the liquid retreat portion + the cross-sectional area of the second mist flow path in the second direction)/the cross-sectional area of the first mist flow path in the second direction shows the second mist flow path The ratio of the cross-sectional area of 32b and the slit 42 in the second direction to the cross-sectional area of the first mist flow path 32a in the second direction. As shown in Table 1, with respect to the droplet arrival amount of Comparative Example 1 which does not have a liquid retreat part, in any of Examples 1 to 9, the droplet arrival amount has been reduced. That is, by retreating the liquid The avoiding portion is provided on the inner wall portion 34, that is, it is possible to reduce the reach of liquid droplets. Therefore, according to this experiment, it was found that when the above-mentioned ratio exceeds 1 and 4.0 or less, the droplet arrival amount can be reduced.

In addition, in Example 1, the reach of liquid droplets was 0.9, which was greatly reduced compared to Comparative Example 1, but the area of the liquid retreat portion, that is, the cross-sectional area of the slit 42 in the second direction was 8.86 mm ² , which is equivalent to Compared with Example 2 to Example 9, the area of the liquid retreat portion is larger. When the area of the liquid retreat portion is large, it may affect the volume of the storage tank 30. Therefore, according to this experiment, it can be understood that the above-mentioned ratio is preferably approximately 3 or less.

With reference to the arrival amount of droplets in Examples 1 to 9, compared with other examples, Examples 1 to 5 and 7 have been able to significantly reduce the arrival amount of droplets. Therefore, according to this experiment, it can be understood that the above-mentioned ratio is particularly preferably 1.5 or more.

In addition, for the experiment, the outer shape of the inner wall portion 34 shown in Fig. 6 is all set to the same diameter. However, the outer shape of the inner wall portion 34 may be designed to correspond to the shape of the second mist flow path 32b and the liquid retreating portion. FIGS. 7A and 7B are schematic views showing the inner wall portion 34 having an outer surface shape that does not correspond to the shapes of the second mist flow path 32b and the liquid retreating portion. In addition, FIG. 7C and FIG. 7D are schematic diagrams showing the inner wall portion 34 having an outer surface shape corresponding to the shape of the second mist flow path 32b and the liquid retreating portion. In the example shown in FIG. 7A, the outer shape of the inner wall portion 34 is a shape similar to the cross-sectional shape of the second mist flow path 32b (that is, a circular shape). The thickness of the inner wall portion 34 shown in FIG. 7A is that the vicinity of the liquid retreating portion (the slit 42) is relatively thin. Therefore, when the outer shape of the inner wall portion 34 is designed such that the thinnest portion of the inner wall portion 34 has sufficient strength, the thickness of the inner wall portion 34 may locally become excessively thick. In the example of FIG. 7A, the inner wall portion 34 that defines the second mist flow path 32b (upper and lower portions in the figure) has become too thick.

In the example shown in FIG. 7B, the outer shape of the inner wall portion 34 is rectangular. In Fig. 7B, the outer shape of the inner wall portion 34 shown in Fig. 7A is shown in broken lines for reference. As shown in Figure 7B The thickness of the inner wall portion 34 is relatively thin in the vicinity of the liquid retreat portion (slit 42) similarly to the inner wall portion 34 shown in FIG. 7A. Therefore, when the outer shape of the inner wall portion 34 is designed such that the inner wall portion 34 has sufficient strength at the thinnest part, the thickness of the inner wall portion 34 may locally become too thick. In the example of FIG. 7B, the inner wall portion 34 that defines the second mist flow path 32b (upper and lower portions in the figure) has become too thick.

In contrast, in the example shown in FIG. 7C, the outer shape of the inner wall portion 34 is elliptical. In Fig. 7C, the outer shape of the inner wall portion 34 shown in Fig. 7A is shown with a broken line for reference. The inner wall portion 34 shown in FIG. 7C is designed so that the thickness near the liquid retreat portion (slit 42) is close to the thickness of the portion (upper and lower portion in the figure) defining the second mist flow path 32b. Therefore, the area occupied by the outer shape of the inner wall portion 34 shown in Fig. 7C (the area of the ellipse in Fig. 7C) is compared with the area occupied by the outer shape of the inner wall portion 34 shown in Fig. 7A (the area of the outer surface of the inner wall portion 34 shown in Fig. 7A). The area of the dotted circle in Figure 7C) is small. That is, the storage tank 30 provided with the inner wall portion 34 shown in FIG. 7C can have a larger capacity than the storage tank 30 provided with the inner wall portion 34 shown in FIG. 7A.

In addition, in the example shown in FIG. 7D, the outer shape of the inner wall portion 34 is similar to the shape of the second mist flow path 32b and the liquid retreating portion (slit 42). In Fig. 7D, the outer shape of the inner wall portion 34 shown in Fig. 7A is shown with a broken line for reference. In Fig. 7D, the area occupied by the outer shape of the inner wall portion 34 is also smaller than the area occupied by the outer shape of the inner wall portion 34 shown in Fig. 7A (the area of the dashed circle in Fig. 7C) . That is, the storage tank 30 provided with the inner wall portion 34 shown in FIG. 7D can have a larger capacity than the storage tank 30 provided with the inner wall portion 34 shown in FIG. 7A. Therefore, as shown in FIG. 7C and FIG. 7D, the so-called shape corresponding to the shape of the second mist flow path 32b and the liquid retreating portion is a shape that is different from that of the second mist flow path 32b shown in FIG. 7A. A shape with a similar cross-sectional shape and a smaller cross-sectional area of the outer shape.

<Experimental example 2>

An experiment was carried out to evaluate the reach of the droplet corresponding to the length of the liquid retreat portion. In this experiment, the inner wall part 34 (Example 10 and Example 11) with the width W of the slit 42 set to 3.0 mm and the height H of 1.5 mm was prepared, and the width W of the slit 42 set to 4.5 mm, the height H is set to the inner wall portion 34 of 0.75 mm (Examples 12 and 13). The length of the slit 42 is set to 0 mm, 5 mm, 10 mm, 15 mm, and 20 mm with respect to the inner wall portion 34 of Example 10 and Example 11. Compared with the inner wall portion 34 of Example 12 and Example 13, the length of the slit 42 is thinner. The length of the slit 42 was set to 10 mm, 15 mm, and 20 mm, and experiments were conducted under the following suction conditions. In this experiment, it was measured that a predetermined amount of liquid was injected into the first mist flow path 32a defined by the inner wall portion 34 of the embodiment 10 to the embodiment 13 to make it columnar, and the first mist flow path 32a was inhaled under predetermined conditions. The amount of liquid scattered from the second mist flow path 32b to the front end of the inner wall portion 34 at this time. In addition, in Examples 10 to 13, the lengths of the first mist flow path 32a and the second mist flow path 32b in the first direction were set to 30 mm.

The inhalation conditions are as follows.

Absorption capacity: 2400cc/min

Inhalation time: 3 seconds

Number of suctions: 1 time (Example 11 and Example 13), 5 times (Example 10 and Example 12)

Inhalation interval: 20 seconds

N number (sample size): 3

The direction of the storage tank 30 (the angle of the first direction): inclined 45 degrees with respect to the vertical

Liquid composition: glycerin: propylene glycol: water=45:45:10

Liquid injection volume: 20μl

Figure 8 is a graph showing the evaluation result of Experimental Example 2. In Fig. 8, the curve with the length of the liquid retreat portion of Example 10 and Example 11 being 0 mm shows the evaluation result of the inner wall portion 34 without the liquid retreat portion. When the length of the liquid retreat portion is 0 mm, the droplet arrival amount of Example 10 is about 19.2 mg, and the liquid When the length of the retreat portion is 0 mm, the droplet arrival amount of Example 11 is approximately 13.3 mg. In contrast, Example 10 and Example 11 in which the length of the liquid retreat portion is 5 mm can reduce the reach of droplets more than Example 10 and Example 11 in which the length of the liquid retreat portion is 0 mm, respectively. Specifically, the droplet arrival amount of Example 10 when the length of the liquid retreat portion was 5 mm was approximately 14.3 mg, and the droplet arrival amount of Example 11 when the length of the liquid retreat portion was 5 mm was approximately 6.4 mg. Therefore, according to this experiment, it can be understood that the presence of the liquid retreating portion can reduce the amount of droplets reached.

The reach of the liquid droplets of Examples 1 to 4 with a length of the liquid retreat portion of 10 mm were about 2.7 mg, about 1.3 mg, about 3.3 mg, and about 3.6 mg, respectively. Therefore, when the length of the liquid retreat portion is 10 mm, compared to when the length of the liquid retreat portion is 5 mm, the amount of droplets reached can be significantly reduced. In addition, the reach of the liquid droplets of Examples 1 to 4 with a length of 15 mm of the liquid retreat portion were about 1.2 mg, about 0.7 mg, about 2.8 mg, and about 0.6 mg, respectively, and the liquid retreat portion of Example 1 was 20 mm. The reach of the droplets to Example 4 were about 1.1 mg, about 0.7 mg, about 0.4 mg, and about 0.5 mg, respectively. Therefore, by setting the length of the liquid retreat portion to 10 mm or more, it is possible to further reduce the reach of liquid droplets.

Based on the above experimental results, with regard to the length of the liquid retreat portion, from the viewpoint of reducing the amount of droplets reached, the length of the liquid retreat portion is preferably 10 mm or more and 20 mm or less. In other words, the ratio of the length of the liquid retreating portion (slit 42) in the first direction to the length (30 mm) of the first mist flow path 32a and the second mist flow path 32b is preferably 1/3 or more and 2/ 3 or less.

Next, another embodiment of the non-combustion heating type flavor inhaler 100 will be described. Another embodiment of the non-combustion heating type aroma inhalation device 100, compared with the non-combustion heating type aroma inhalation device 100 illustrated in Figures 1 to 8, the difference lies in: the storage tank 30 The tip is provided with a liquid holding part that communicates with the liquid evacuated to the liquid evacuation part. FIG. 9 is a schematic side sectional view of the storage tank 30 of the non-combustion heating type flavor inhaler 100 of another embodiment. The storage tank 30 shown in Figure 9 can be the same as that shown in Figure 3 The storage tank 30 has the same structure. In the example shown in FIG. 9, the storage tank 30 is provided with the cover member 50 which covers the upper wall part 30a of the front end.

FIG. 10A is a perspective view of the cover member 50. FIG. 10B is a plan view of the cover member 50. FIG. Fig. 10C is a cross-sectional view of the arrow direction view 10C-10C shown in Fig. 10B. As shown in the figure, the cover member 50 includes a top plate portion 52 having a substantially rectangular plate shape corresponding to the shape of the tank 30 and a substantially cylindrical side plate portion 54 extending from the top plate portion 52. An opening 56 is provided in the approximate center of the top plate 52. The opening 56 communicates with the mist flow path 32 of the storage tank 30 and allows the mist from the mist flow path 32 to pass therethrough. The opening 56 is formed in the cover member 50 such that the center of the opening 56 is substantially aligned with the center of the mist flow path 32 of the tank 30 in the second direction when the cover member 50 is installed in the tank 30. In addition, on the surface of the top plate portion 52 facing the upper wall portion 30a of the storage tank 30, one or a plurality of protrusions 58 extending in the second direction are provided. Thereby, concave and convex portions are formed on the surface of the top plate portion 52 facing the upper wall portion 30a of the tank 30. When the cover member 50 is installed in the storage tank 30, the concave and convex portions will communicate with the liquid retreat portion of the storage tank 30.

As shown in FIG. 10B, the protrusion 58 is preferably configured such that the gap of the protrusion 58 becomes smaller as it moves away from the mist flow path 32 (or the opening 56) in the second direction. In addition, as shown in FIG. 10C, the ridge portion 58 is preferably configured such that the gap of the ridge portion 58 becomes larger as it moves away from the top plate portion 52 in the first direction. In other words, in a state in which the cover member 50 is attached to the tank 30, the ridge portion 58 is preferably configured such that the gap of the ridge portion 58 increases as it moves away from the upper wall portion 30a (front end) of the tank 30 in the first direction. Become smaller. In addition, the size of the gap between the protrusions 58 in the second direction is arbitrary, and may be fixed, for example.

In summary, the mist will condense on the wall surface of the inner wall portion 34 that delimits the mist flow path 32, and the droplets will form a columnar shape. The column-shaped droplets move toward the cigarette holder 18 as the user's non-combustion heating type flavor inhalation device 100 is inhaled, and retreat to the liquid retreat portion, that is, retreat to the flat portion 40 or the slit 42. When the non-combustion heating type aroma inhalation appliance 100 is further used, it is retreated to the liquid retreating part The droplets reach the tip of the liquid retreat, or the liquid retreat is filled with droplets. At this time, there is a concern that the liquid droplets will reach the mouth of the user from the liquid retreating part.

Therefore, in the present embodiment, the cover member 50 is provided with uneven portions (corresponding to an example of the liquid holding portion) communicating with the liquid retreating portion. The droplet reaching the front end of the liquid retreating portion is held by the concavo-convex portion of the cover member 50 by capillary action. In addition, the droplet reaching the front end of the liquid retreating portion can also be held in the gap between the top plate portion 52 of the cover member 50 and the upper wall portion 30a of the tank 30 by capillary action. Thereby, it is possible to prevent the liquid retreated to the liquid retreating portion from reaching the mouth of the user. In addition, in the present embodiment, since the gap formed as the protrusion 58 becomes smaller as it leaves the mist flow path 32 in the second direction, it can promote the liquid to leave the mist in the second direction by the capillary phenomenon. The direction of the flow path 32 moves. Furthermore, in this embodiment, since the gap formed as the protruding portion 58 becomes smaller as it moves away from the upper wall portion 30a of the tank 30 in the first direction, it can promote the liquid to move toward the second place by the capillary phenomenon. Move in a direction away from the storage tank 30 in one direction.

In addition, in this embodiment, a plurality of protrusions 58 are provided to form the concave and convex portions, but it is not limited to this. If it is possible to form uneven portions that can hold liquid by capillary action, the shape is arbitrary, and for example, a plurality of protrusions, a plurality of recesses, etc. may be used. Furthermore, instead of the uneven portion, or in addition to the uneven portion, a porous member or fiber may be provided between the top plate portion 52 of the cover member 50 and the upper wall portion 30a of the tank 30. Liquid holding member (corresponding to an example of a liquid holding part). The porous member, fiber, etc. may include, for example, cellulose-based non-woven fabric, glass fiber non-woven fabric, paper, sponge, ceramics, glass porous body, and the like. In addition, the cover member 50 can be detached from the storage tank 30 by the user, and can also be fixed to the storage tank 30 in a manner that cannot be removed.

In addition, the concave-convex part of this embodiment is located on the outer side of the mist flow path 32 in the radial direction. Therefore, it is possible to prevent the mist passing through the mist flow path 32 from reaching the concavities and convexities. As a result, it is possible to prevent the mist from condensing on the Concave and convex part. When a liquid holding member composed of a porous member or fiber is arranged between the top plate portion 52 of the cover member 50 and the upper wall portion 30a of the tank 30, it is also preferable to arrange the liquid holding member in a more misty atmosphere. A position where the flow path 32 is spaced further outward in the radial direction.

In this embodiment, although a plurality of protrusions 58 are provided to form the uneven portions, if the liquid can be retained by capillary action, the cover member 50 may not have the protrusions 58. Fig. 11 is a schematic side sectional view of a storage tank 30 provided with a cover member 50 of another embodiment. Although the cover member 50 shown in FIG. 11 does not have the protruding portion 58, the droplets reaching the front end of the liquid retreating portion are held on the top plate portion 52 and the tank 30 of the cover member 50 by capillary action The gap of the wall portion 30a (corresponding to an example of the liquid holding portion). In addition, in the embodiment shown in the figure, the distance between the surface of the top plate portion 52 of the cover member 50 on the tank 30 side and the upper wall portion 30a of the tank 30 as it leaves the mist flow path in the second direction The cover member 50 is formed in such a way that it becomes smaller. Thereby, the droplet reaching the front end of the liquid retreating portion is first held by a relatively large gap between the top plate portion 52 of the cover member 50 and the upper wall portion 30a of the tank 30. In addition, according to the embodiment shown in the figure, the droplets held in a relatively large gap can be promoted to move in the second direction to leave the opening 56 by capillary action.

In addition, the distance between the surface on the tank 30 side of the top plate portion 52 of the cover member 50 and the upper wall portion 30a of the tank 30 may be fixed. In addition, the cover member 50 shown in FIG. 11 may be provided with the ridge portion 58 shown in FIGS. 10A to 10C.

FIG. 12 is a schematic top view of the storage tank 30 of the non-combustion heating type flavor inhalation device 100 of still another embodiment. As shown in the figure, one or more protrusions 36 are formed on the front end surface of the storage tank 30. Thereby, the uneven part (corresponding to an example of the liquid holding part) is formed in the end surface of the front end side of the upper wall part 30a of the tank 30. This concave-convex part communicates with the liquid retreating part of the storage tank 30.

As shown in FIG. 12, the protrusion 36 is preferably configured such that the gap of the protrusion 36 becomes smaller as it moves away from the mist flow path 32 in the second direction. In addition, the ridge portion 36 is the same as the ridge portion 58 shown in FIG. 10C Similarly, the gap of the ridge portion 36 becomes smaller as it moves away from the upper wall portion 30a in the first direction. In addition, the size of the gap between the protrusions 36 is arbitrary, and may be fixed, for example.

Since the storage tank 30 has the concavities and convexities communicating with the liquid retreat portion, the droplets reaching the front end of the liquid retreat portion are held by the concavities and convexities of the storage tank 30 by capillary action. Thereby, it is possible to prevent the liquid retreated to the liquid retreating portion from reaching the mouth of the user. In addition, in the present embodiment, since the gap formed as the protrusion 36 becomes smaller as it leaves the mist flow path 32 in the second direction, it can promote the liquid to leave the mist in the second direction by capillary phenomenon. The direction of the flow path 32 moves. Furthermore, when the gap formed as the protrusion portion 36 moves away from the front end of the tank 30 in the first direction, that is, the upper wall portion 30a of the tank 30, the liquid can be promoted to move in the first direction by capillary phenomenon. Move away from the upper wall portion 30a of the tank 30.

In addition, in this embodiment, a plurality of protrusions 58 are provided to form the concave and convex portions, but it is not limited to this. If it is possible to form uneven portions that can hold liquid by capillary action, the shape is arbitrary, and for example, a plurality of protrusions, a plurality of recesses, etc. may be used. In addition, instead of the uneven portion, or together with the uneven portion, a liquid holding member (corresponding to an example of a liquid holding portion) composed of a porous member, fiber, or the like may be provided on the upper wall portion 30a of the tank 30 together with the uneven portion. The porous member, fiber, etc. may include, for example, cellulose-based non-woven fabric, glass fiber non-woven fabric, paper, sponge, ceramics, glass porous body, and the like. In addition, the cover member 50 shown in FIGS. 10A to 10C or 11 may be attached to the front end of the storage tank 30 shown in FIG. 12.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various changes can be made within the scope of the patent application and the technical ideas described in the specification and drawings. In addition, any shape or material that is not directly described in the specification and drawings, as long as it can achieve the functions and effects of the invention, is also within the scope of the technical idea of the invention.

Several types disclosed in this specification are described below.

According to the first type, an atomization unit is provided. The atomization unit has: an atomization part, which is configured to atomize the mist source; a storage tank, which holds the aforementioned mist source; and a wall part, which is designed for passing the mist generated by the aforementioned mist source through atomization and At least a part of the mist flow path extending in the first direction. At least a part of the aforementioned wall constitutes a part of the side wall of the aforementioned storage tank. The mist flow path system has: a first mist flow path; and a second mist flow path communicating with the downstream side of the first mist flow path. The atomization unit further has a liquid retreat part, the liquid retreat part is provided in the second mist flow path, and from the junction of the first mist flow path and the second mist flow path toward the downstream of the second mist flow path extend. The wall portion has a plane portion parallel to a second direction orthogonal to the first direction at the junction of the first mist flow path and the second mist flow path. The liquid retreat portion includes a space defined by the flat surface portion. The ratio of the cross-sectional area of the second mist flow path and the liquid retreating portion in the second direction to the cross-sectional area of the first mist flow path in the second direction is more than 1 and 4.0 or less.

The second form is the same as the first form, and its gist is that the wall includes a second mist flow path wall that defines at least a part of the second mist flow path, and the second mist flow path wall constitutes Part of the side wall of the aforementioned storage tank.

The third form is the same as the second form, and its gist is: the wall part further includes a first mist flow path wall that delimits at least a part of the first mist flow path, and the first mist flow path wall is constituted Part of the side wall of the aforementioned storage tank.

The fourth form is the same as the first form to the third form, and its gist is: the wall part includes a slit extending in the first direction, and the liquid retreating part includes the slit Delineated space.

The fifth form is similar to the fourth form, and its gist is that the cross-sectional shape of the second mist flow path in the second direction is circular, and the height of the slit is higher than that of the second mist flow path in the first direction. The diameter in both directions is small.

The sixth form is any form from the first form to the third form, and its gist is that the cross-sectional shape of the second mist flow path and the liquid retreating portion in the second direction is a square as a whole.

The seventh form is the same as any one of the first to sixth forms, and its gist is: when viewed from the first direction, the wall has corners, and the liquid retreating part includes the corners. The space determined by the Ministry.

The eighth form is the same as the first form to the seventh form, and its gist is: the length of the liquid retreating portion in the first direction is relative to the first mist flow path and the second mist The ratio of the length of the flow path is 1/3 or more and 2/3 or less.

The ninth form is the same as the first form to the eighth form, and its gist is: the cross-sectional shape of the first mist flow path in the second direction is in line with the second mist flow path The cross-sectional shape in the aforementioned second direction is the same.

The tenth form is the same as any one of the first form to the ninth form, and its gist is: the cross-sectional shape of the first mist flow path and the second mist flow path in the second direction is circular .

The eleventh form is the same as the first form to the tenth form, and its gist is: the cross-sectional shape of the first mist flow path and the second mist flow path in the second direction is The aforementioned first direction is fixed.

According to the twelfth form, a non-combustion heating type fragrance inhalation device is provided. The non-combustion heating type flavor inhalation appliance has: an atomizing unit of any one of the first to sixth types; and a power source for supplying electric power to the atomizing part.

32a: The first fog flow path

32b: Second fog flow path

34: inner wall

34a: Wall of the first mist flow path

34b: Wall of the second mist flow path

40: Plane

42: Slit

Claims (12)

An atomization unit with: The atomization part is configured to atomize the mist source; The storage tank maintains the aforementioned mist source; and The wall defines at least a part of the mist flow path through which the mist generated by the atomization of the mist source passes and extends in the first direction; At least a part of the aforementioned wall constitutes a part of the side wall of the aforementioned storage tank; The mist flow path has: a first mist flow path; and a second mist flow path, which communicates with the downstream side of the first mist flow path; The atomization unit further has a liquid retreat part, the liquid retreat part is provided in the second mist flow path, and from the junction of the first mist flow path and the second mist flow path toward the downstream of the second mist flow path extend; The wall portion has a flat surface parallel to the second direction orthogonal to the first direction at the junction of the first mist flow path and the second mist flow path, and the liquid retreat portion includes a flat portion delimited by the flat surface. Fixed space The ratio of the cross-sectional area of the second mist flow path and the liquid retreating portion in the second direction to the cross-sectional area of the first mist flow path in the second direction is more than 1 and 4.0 or less. The atomization unit described in claim 1, wherein the wall portion includes a second mist flow path wall portion that delimits at least a part of the second mist flow path; the second mist flow path wall portion is It constitutes a part of the side wall of the aforementioned storage tank. According to the atomization unit described in claim 2, wherein the wall portion further includes a first mist flow path wall portion that delimits at least a part of the first mist flow path; the first mist flow path wall portion is It constitutes a part of the side wall of the aforementioned storage tank. According to the atomization unit described in claim 1, wherein the wall portion includes a slit extending in the first direction; and the liquid retreating portion includes a space delimited by the slit. The atomization unit described in item 4 of the scope of patent application, wherein the cross-sectional shape of the second mist flow path in the second direction is circular; the height of the slit is higher than that of the second mist flow path. The diameter in the second direction is small. The atomization unit described in claim 1, wherein the cross-sectional shape of the second mist flow path and the liquid retreating portion in the second direction is a square as a whole. As for the atomization unit described in claim 1, when viewed from the first direction, the wall portion has a corner; the liquid retreating portion includes a space determined by the corner. The atomization unit described in claim 1, wherein the ratio of the length of the liquid retreating portion in the first direction to the length of the first mist flow path and the second mist flow path is 1 /3 or more and 2/3 or less. The atomization unit described in claim 1, wherein the cross-sectional shape of the first mist flow path in the second direction is the same as the cross-sectional shape of the second mist flow path in the second direction . The atomization unit described in claim 1, wherein the cross-sectional shape of the first mist flow path and the second mist flow path in the second direction is circular. According to the atomization unit described in claim 1, wherein the cross-sectional shape of the first mist flow path and the second mist flow path in the second direction is fixed in the first direction. A non-combustion heating type aroma inhalation appliance is provided with: the atomization unit as described in any one of items 1 to 11 in the scope of the patent application; and a power supply for supplying electric power to the atomization unit.

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