KR20200129682A - Method and apparatus for generating aerosols - Google Patents

Abstract

The present invention provides a method for generating an aerosol, comprising the steps of: a droplet dropping freely on the porous surface by gravity; and dispersing an aerosol from the porous surface into the air by an impact between the droplet and the porous surface.

Description

Aerosol generation method and apparatus {METHOD AND APPARATUS FOR GENERATING AEROSOLS}

The present invention relates to a method and apparatus for generating an aerosol, and more particularly, to a method and apparatus capable of generating a controlled aerosol without using external force or external pressure caused by a driving device.

It refers to a state in which solid or liquid particulates are dispersed and suspended in a gas, such as smoke or fog, and this state is regarded as one of the sols in which colloidal particles of solid or liquid are dispersed in a dispersion medium called a gas, and is called an aerosol.

Conventional aerosol generating devices generate aerosols by using external force or external pressure caused by a driving device driven by a power source. Specifically, conventional aerosol generation methods can be classified into two broad categories, one of which is a method of generating an aerosol by directly injecting a sample to be aerosolized and an air jet together, and the other is a method of injecting an air jet on the surface of the sample. This was a way to create aerosols by floating particles in the air.

This method of generating an aerosol by external force or external pressure has a clear limitation in academic research first. In a study based on the aerosol generation phenomenon, when an equation is derived based on experimental values and a model is proposed, unnecessary variables for the external force or external pressure increase, which complicates the process of formulating, reduces the efficiency, and becomes a theoretical model. The value is also halved. That is, by generating an artificial external pressure or external force and using it to generate an aerosol, it becomes difficult to access the phenomenon mathematically. In addition, when generating a bio aerosol containing microorganisms such as bacteria, there is a disadvantage in that a number of microorganisms may die or biological characteristics may be changed during the aerosol generation process by an external force.

In addition, there is a disadvantage in that it is difficult to finely control aerosol characteristics such as particle size and amount of aerosol to be generated, and only mass production is possible. In addition, in order to implement such an aerosol generating device, complicated technical skills are required, and as a result, there is a problem that the manufacturing cost and sales cost are also high.

On the other hand, in terms of application, an inhaled respiratory disease treatment is a typical field where the aerosol generation method is applied. The inhaled respiratory disease therapeutic agent according to the prior art has a problem of reducing the pathological efficacy of the drug obtained from the therapeutic agent by generating particles in a significantly larger range than that of conventional aerosol particles (10 ^-6 to 10 ^-3 mm). Accordingly, there is a problem that excessive consumption of drugs is induced and the speed of treatment is also slowed.

Therefore, it is necessary to present a technology to solve this problem.

KR 10-2013-0116257 A JP 2017-515595 A US 2010-0327075 A

The present invention is to provide an aerosol generation method capable of generating an aerosol without using an external force or external pressure caused by a driving device or the like, and controlling the particle size and amount of the generated aerosol.

In order to solve the above problem, the present invention provides a method for generating an aerosol comprising the step of free-falling a droplet onto a porous surface by gravity, and dispersing an aerosol from the porous surface into air by an impact between the droplet and the porous surface. Provides.

According to an exemplary embodiment, in the free falling step, the speed at which the droplets collide on the porous surface may be changed according to a change in a distance at which the droplets fall to the porous surface.

According to an embodiment, in the free falling step, the functional material may be dissolved in the droplet, and the functional material may be dissolved in the aerosol.

According to an embodiment, in the step of dispersing the aerosol, the functional material is penetrated into the porous surface, so that the functional material may be dissolved in the aerosol.

According to an embodiment, in the step of dispersing the aerosol, the size distribution and generation amount of the aerosol may be changed according to changes in size, surface tension, or viscosity of droplets colliding with the porous surface.

According to an embodiment, in the step of dispersing the aerosol, the droplet collides with the porous surface and expands in a contact surface direction, and when the expanded droplet reaches a maximum diameter, the microbubbles form the expanded droplet and the porous surface. It is mixed at the interface between, and a part of the expanded droplet is absorbed by the porous surface, so that the height of the expanded droplet decreases, but the microbubbles grow in size due to the air contained in the porous surface, and Bubbles may be ruptured while generating fine jet water by meeting an interface between the expanded droplet and air on the surface of the expanded droplet.

According to an embodiment, the number of microbubbles generated in the expanded droplet may be proportional to a collision speed of the droplet against the porous surface.

According to an embodiment, the number of microbubbles generated in the expanded droplet may vary depending on the material of the porous surface.

According to an embodiment, the height of the expanded droplet may be inversely proportional to an impact velocity of the droplet on the porous surface.

According to an embodiment, the height of the expanded droplet may be different depending on the material of the porous surface.

According to an embodiment, the size distribution and generation amount of the aerosol may be different depending on the temperature of the porous surface.

According to an embodiment, after the step of dispersing the aerosol, the step of moving the aerosol by the introduced external air may be further included.

In addition, the present invention provides a body forming an exterior, a porous material located in the inner and lower portions of the main body, a liquid stored in an inner upper receiving space of the main body, and a liquid stored in the receiving space as the porous material in the form of droplets. Including a nozzle located under the receiving space, wherein the body, the discharge port for discharging the aerosol generated by impacting the porous material to the outside of the body, and the generated aerosol through the discharge port It provides an aerosol generating apparatus comprising an inlet through which air from outside the main body is introduced into the main body in order to induce it.

According to the present invention, by generating an aerosol without using an external force or external pressure caused by a driving device, a more accurate theoretical aerosol generation model can be made, and the device implementing the aerosol generation method according to the present invention is not complicated in configuration. Production cost and sales cost can be lowered.

In addition, according to the present invention, it is possible to control the particle size and amount of the aerosol generated.

1 is a step-by-step flowchart of a method of generating an aerosol according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram illustrating a method of generating an aerosol of FIG. 1.
3A is a diagram illustrating a process of dispersing an aerosol from droplets freely falling on a porous surface according to an embodiment of the present invention.
3B is a view showing an image captured by a high-speed camera in the process of generating an aerosol according to an embodiment of the present invention.
4 is a graph showing characteristics of aerosols or microbubbles generated after droplets collide on a porous surface according to an embodiment of the present invention.
5 is a graph showing a correlation between aerosol and microbubbles generated according to an embodiment of the present invention.
6 is a block diagram of an aerosol generating apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail through preferred embodiments. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the configuration of the embodiments described in the present specification is only the most preferred embodiment of the present invention, and does not represent all the technical spirit of the present invention, and various equivalents and modifications that can replace them at the time of application It should be understood that there may be. In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

How to create aerosol

FIG. 1 is a step-by-step flowchart of a method for generating an aerosol according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram illustrating the method for generating an aerosol of FIG. 1.

As shown in FIG. 1, in the method of generating an aerosol according to an embodiment of the present invention, the step of freely falling on a porous surface by gravity (S10) and from the porous surface to the air by an impact between the droplet and the porous surface Including the step of dispersing the aerosol (S20), it is possible to generate an aerosol.

Hereinafter, each step will be described in detail with reference to FIG. 2.

The droplets 11, which are small liquid droplets, may freely fall from the droplet dropping device 10 to the porous surface in the direction of gravity (S10).

The droplet dropping device 10 is a device for dropping the droplets 11, and the present invention does not specifically limit the type or configuration of the drop dropping device 10, but for example, the drop dropping device 10 is filled with liquid The container may include a nozzle through which the liquid contained in the container is ejected to the outside. The droplet dropping apparatus 10 according to an embodiment of the present invention allows droplets to be dropped by their own weight without external force or external pressure when ejected through a nozzle, or eject droplets into a container through a nozzle or suck through a nozzle. It may further include a piston capable of reciprocating motion within the container for this purpose.

In addition, the material of the falling droplet 11 is not particularly limited, but may be distilled water or distilled water in which a chemical or biologically functional material is dissolved. The aerosol generated from distilled water in which the functional material is dissolved also has functionality. For example, when a functional material having a medicinal effect is dissolved in a droplet, the aerosol generated from the droplet may be provided to a human body or an animal for treatment.

In addition, the size or shape of the droplet 11 is not particularly limited, but it may be preferably a sphere having a diameter of 1 mm to 5 mm, more preferably a sphere having a diameter of 2 mm to 3 mm.

When the diameter of the droplet 11 is more than 5 mm, the area of the droplet in contact with the surface of the porous material 20 (which may be abbreviated as a “nano-porous surface”) becomes wider to generate more aerosols. However, since the collision speed must be increased to prevent the height of the droplet from increasing after the collision, a separate driving device is required to increase the falling speed of the droplet 11, or the height of the application product must be increased. have.

Therefore, if the aerosol generating device does not include a driving device for pressurizing the liquid for dropping the droplet 11 as an essential component, the diameter of the droplet 11 is preferably 5 mm or less.

On the contrary, when the diameter of the droplet 11 is less than 1 mm, the area of the droplet in contact with the porous surface is narrow and the number of microbubbles generated by the air stored in the pores of the porous surface is small. The diameter of the droplet 11 is preferably 1 mm or more.

In addition, the number or amount of the falling droplets 11 is not particularly limited, but may be set in consideration of the characteristics of the porous surface in order to continuously generate an aerosol.

Aerosol generation is determined by wettability among the porous surface properties. Due to the collision of the droplets 11, the air stored in the pores of the porous surface must be exhausted and returned to the original state in order to generate the next aerosol in the wet state. Accordingly, the number or amount of droplets can be determined within a range that does not lose surface properties for generating aerosols.

When a droplet having a diameter of 2.8 mm is dropped from a height of 10 cm on TLC-C (the highest wettability among TLC-A, TLC-B and TLC-C), which is an aluminum porous material shown in Table 1 below, the second time at 10 second intervals The aerosol was generated until the droplet fell, but the aerosol was not generated when the droplet fell after the third time.

As a result of dropping the droplets continuously while increasing the interval gradually, when the droplets were repeatedly dropped at an interval of 5 minutes or more, an aerosol was generated from all the dropped droplets.

Consequently, in order to generate an aerosol for all droplets, it is desirable to drop the droplets at an interval of 5 minutes or more regardless of the porous material.

In addition, in order to continuously generate aerosol, the porous surface can be continuously moved to the dropping position so that the droplets can always fall on the dry surface.

When the droplet discharged from the droplet dropping device 10 falls on the surface of the porous material and collides by gravity, an aerosol may be dispersed and generated by the impact (S20). In the present invention, an aerosol having a diameter size of 10 ^-6 to 10 ^-3 mm (generating an aerosol having a diameter of 100 micrometers or less) is generated as a reference.

The porous material 20 has a porous surface having a diameter smaller than the diameter of the falling droplet 11 or the diameter of the expanded droplet 11b after collision, and the pore size of the porous surface is, for example, 6 ~15nm (60 ~ 150) may be preferred, but is not particularly limited.

Table 1 shows the various types of porous materials used in the aerosol generation experiment according to the present invention and their properties.

[Table 1]

According to an embodiment, a functional material may be penetrated into the surface of the porous material 20 to generate an aerosol in which the functional material is dissolved, and even if droplets not containing the functional material are dropped, an aerosol in which the functional material is dissolved Can be created.

3A is a diagram illustrating a process of dispersing an aerosol from droplets freely falling on a porous surface according to an embodiment of the present invention.

In the step of dispersing the aerosol (S20), an aerosol may be generated through the process shown in FIG. 3A.

First, the droplet 11a collides with the porous surface of the porous material 20 and expands in the contact surface direction of the porous surface (see Fig. 3a(a)), and after the collision, when the diameter d of the droplet 11a reaches the maximum value The droplet vibrates, and microbubbles 13 are generated at the interface between the expanded droplet 11b and the porous surface (see FIG. 3A(b)). After that, a part of the expanded droplet 11b is absorbed by the porous surface, so that the height of the expanded droplet 11c decreases, but the microbubbles 13 grow in size due to the air contained in the porous surface. (See Fig. 3a(c)). The growing microbubbles 13 rupture while meeting the interface with the external air of the expanded droplet 11d whose height is lowered to generate the fine jet water 12 (see FIG. 3A(d)).

The above-described aerosol generation process is shown in FIG. 3B of an image photographed with a high-speed camera. The porous material used here is TLC-C, which is an aluminum porous material, and this is an image taken when a 2.8mm diameter water drop is dropped from a height of 1cm.

As shown in Fig. 3b, when a droplet falls on the porous surface, the droplet collides with the porous surface (part a in Fig. 3b), and the collided droplet is expanded/compressed (part b in Fig. 3b), and then the droplet is vibrated. While doing this, microbubbles are mixed into the interior (part c of FIG. 3B). Thereafter, the height of the expanded droplet 11c decreases and the microbubbles 13 grow (part d in FIG. 3B), and the growing microbubbles 13 meet the interface with the external air of the expanded droplet 11a While generating the jetting water 12 (part e in Fig. 3b), an aerosol is generated (part f in Fig. 3b).

Looking closely at the process of generating aerosol by rupture of microbubbles, microbubbles formed in the expanded droplets (part d in Fig. 3b) gradually increase in size and burst (part e in Fig. 3b), and the ruptured microbubbles form a water column After formation (part g in Fig. 3b), the aerosol is dispersed (part f in Fig. 3b). Part h of FIG. 3B is an image photographing a state in which an aerosol is generated by dropping a 2.8mm droplet from a height of 10cm above the surface of the TLC-C porous material.

In the following, in order to control the initial generation time of the aerosol generated according to the present invention, the number of aerosols and/or the diameter of the aerosol, etc., various characteristics of the aerosol and/or microbubbles generated after droplet collision on the porous surface are described. Let's take a look.

4 is a graph showing characteristics of aerosols or microbubbles generated after droplets collide on a porous surface according to an embodiment of the present invention.

As shown in FIG. 4(a), the height (or average droplet film thickness) of the expanded droplet after the droplet collision on the porous surface is the square of the impact velocity of the droplet 11 on the porous surface (U _o ² ), that is, It is inversely proportional to the velocity at the moment when the droplet 11 strikes the porous surface. In other words, the reciprocal (1/h _min ) of the height of the expanded droplet (or the average droplet film thickness) is linearly proportional to the square of the impact velocity (U _o ² ). In addition, the average diameter of the microbubbles 13 generated in the expanded droplet may also be linearly proportional to the square of the impact velocity (U _o ² ), but the slope is small and has a negative value.

Therefore, dispersion of aerosol occurs at the point where the two graphs intersect, the square of the impact velocity (U _o ² ) 1 (m/s) ² or more. That is, the impact velocity square (Uo ² ) at which the growing microbubbles meet the interface with the external air of the droplet and starts to generate an aerosol is 1 (m/s) ² or more, and preferably the impact velocity square is 2 (m/s). s) It is preferably ² or less.

As a result of observation in the experiment where the minimum impact velocity square is less than 1 (m/s) ² , the drop 11 increases the height of the droplet on the porous surface, and microbubbles generated inside the droplet explode on the droplet surface, creating an aerosol. For this, the size of the microbubbles 13 must be increased. After the droplet 11 collides with the porous surface, the time it takes for the size of the microbubbles 13 to increase before the microbubbles burst from the droplet surface to generate an aerosol increases, but rather the total microbubbles 13 generated within the droplet As the number of cells decreases, the amount of aerosol is reduced.

On the contrary, if the square of the impact velocity of the droplet exceeds 2 (m/s) ² , the height of the droplet after the droplet 11 collides with the porous surface becomes very low. Due to this lack, the amount of aerosol generation is reduced or made impossible.

Depending on the porous surface properties of the porous material, the critical impact velocity at the dropping of droplets for generating an aerosol may be different. As a result of the experiment, on the surface of the porous material, droplets generated the most aerosol at 1.4 m/s to 1.7 m/s.

Rather, it can be seen that aerosol generation decreases at an impact velocity exceeding 1.7 m/s. This is because the impact velocity is a factor that determines the maximum diameter and minimum height of the dropped droplet. At a collision velocity of 1.7 m/s or less, the area of the porous surface covered with the dropped droplet increases with the velocity, increasing the surface area for forming air bubbles and generating more aerosols. Whereas 1.7m/s At an ideal impact velocity, bubble formation is limited by the height after impact of the dropped droplet. Thus, although the surface area covered by the droplet increases, the aerosol generated decreases.

On the other hand, as shown in Fig. 4(b), the number of bubbles 13 generated in the expanded droplet after the droplet collides on the porous surface is the impact velocity squared (U _o ² ) 2 (m /s) In the range of ² or less, it increases linearly with respect to the square of the impact velocity (U _o ² ) of the droplet 11 on the porous surface. Therefore, when the impact velocity square (U _o ² ) 2 (m/s) ² or less, the droplet 11 increases as the impact velocity square (U _o ² ) with respect to the porous surface increases, the bubbles generated in the droplet 11 The maximum number of s increases linearly.

Therefore, in order to generate the generated aerosol, it is preferable to increase the impact velocity U _{o in} the range of ² or less of the square of the impact velocity (U _o ² ) 2 (m/s).

However, as described above, if the square of the impact velocity (U _o ² ) of the droplet exceeds 2 (m/s) ² , the height of the droplet after the droplet collides with the surface becomes very low. Due to lack of time, the amount of aerosols produced is reduced or becomes impossible.

In addition, the size of the droplet may be controlled according to the diameter and material of the nozzle in which the droplet is generated, and effective aerosol generation is possible when the diameter of the droplet is between 1mm and 5mm. As the size of the droplet increases, the area of the droplet in contact with the porous surface increases, thereby generating more aerosol, but as described above, the collision speed must be increased to prevent the height of the droplet from increasing after the collision.

On the other hand, as shown in Fig. 4(c), the initial sparkling time of the aerosol is in inverse proportion to the square of the impact velocity (U _o ² ).

The initial generation time of the aerosol decreases at the impact speed (U _o ) exceeding the standard impact speed square of 2 (m/s) ² , but the height of the expanded droplets (11a~11d) after the porous surface impact is very high. Because it is low, it is difficult to generate bubbles, or a sufficient bubble size cannot be obtained, making it difficult to generate aerosols.

However, the observation time of the first injection of the aerosol at 2 (m/s) ² or less, which is the square of the standard impact velocity, is according to the microbubble characteristic parameter D _cap , but the microbubble characteristic parameter D _cap is determined as shown in Equation 1 below.

[Equation 1]

Here, r _c refers to the pore size of the porous surface, γ refers to the surface tension of the droplet, θ refers to the contact angle measured on the non-porous surface using the same material as the porous surface of the droplet, and μ refers to the viscosity of the droplet .

On the other hand, as shown in FIG. 4(d), the droplet film thickness (h _min ) (or the height of the expanded droplet) after hitting the porous surface differs depending on the material of the porous surface, but among them, the porous material TLC-A (silica) or TLC-C (aluminium) is thicker than TLC-B (cellulose).

Consequently, in order to generate an aerosol, both the characteristics of the droplets colliding with the porous surface and the characteristics of the porous surface must be satisfied.

According to the experiment, the collision droplet characteristics (W _e ) and the porous surface characteristics (P _e ) shown in each of the following Equations 2 and 3 must be within a predetermined range.

Specifically, the collision droplet characteristic (W _e ) is 10 to 1000, the porous surface characteristic (P _e ) is 10 to 10,000, preferably the collision droplet characteristic (W _e ) is 30 to 300, and the porous surface characteristic (P _e ) is preferably between 100 and 1000.

[Equation 2]

Here, ρ denotes the density of the droplet, D _O denotes the diameter of the droplet, U _O denotes the collision velocity against the porous surface of the droplet, and γ denotes the surface tension of the droplet.

[Equation 3]

Here, U _O denotes the collision velocity with respect to the porous surface of the droplet, D _O denotes the diameter of the droplet, and D _cap denotes the microbubble characteristic parameter of Equation 1 above.

Meanwhile, FIG. 5 is a graph showing a correlation between aerosol and microbubbles generated according to an embodiment of the present invention.

5 is an experimental result in the case where the diameter of droplets dropped on the porous surface was 2.8 mm and the impact velocity was 1.4 m/s, aerosol particles having a diameter of 10 ^-6 to 10 ^-1 mm were generated.

Here, the number of aerosols (Number of aerosol droplets), as shown in Figures 5 (a) and 5 (b), inversely proportional to the diameter of the aerosol (Aerosol droplet size) exponentially, but depending on the temperature of the porous surface The number and diameter of aerosol droplets are variable (see Fig. 5(b)).

As shown in Fig. 5(c), it varies according to the type of the porous surface, but in a case where the temperature of the TLC-C porous surface of aluminuim is 5 to 40°C, the number of microbubbles generated in the droplet is in a log scale as the surface temperature increases. However, when the temperature of the porous surface exceeds 40°C, the number of microbubbles generated in the droplets decreased, and the number and diameter of generated aerosol droplets decreased. And when the temperature of the TLC-A porous surface of silica increased from 5 to 30°C, the number of microbubbles generated in the droplet increased in log scale as the surface temperature increased.

That is, in the relationship between the aerosol droplet size and the number of droplets, the temperature of the porous surface is applied as a variable, and the temperature of the porous surface is within a certain range, which occurs as the temperature increases. The number and diameter of aerosol droplets increase.

Consequently, the temperature of the porous surface may also be an important factor in order to control the diameter or number of aerosols generated, and it is desirable to increase the temperature of the porous surface to increase the number of aerosols and/or the diameter of the aerosol.

Meanwhile, as shown in FIG. 5(d), the number of microbubbles generated inside the expanded droplets 11a to 11d or the total volume of the aerosol generated depend on the porous material and the porous surface temperature.

The number of microbubbles generated for the porous surface temperature is as seen in Fig. 5(c), and the volume of the generated microbubbles for the porous surface temperature is at room temperature as the inflection point, and the volume of the aerosol increases at the surface temperature before and after it. do. That is, in order to control the amount of aerosol and the number of microbubbles, it is preferable to use the porous material and/or the porous surface temperature as the controlling factor.

In order to be insensitive to the temperature change of the porous surface and to reduce the amount of change in the amount of aerosol generated, it is preferable to use TLC-A, a silica that is relatively insensitive to temperature than TLC-C, a temperature sensitive aluminum, and aerosol according to temperature change. It is preferable to use TLC-C, alumina, rather than TLC-A, which is silica, in order to expand the volume of aerosol, regardless of the width of change in the amount of formation.

Meanwhile, according to an embodiment of the present invention, it may further include a step of collecting the generated aerosol or moving the generated aerosol to the outside of the aerosol generation system (not shown).

As described above, it is necessary to move the aerosol in order to provide the generated aerosol to the human body or animals, and the aerosol may be discharged through the outlet by the external air introduced after the aerosol is generated.

To this end, the aerosol generating system may further include a cylinder through which droplets can pass between the droplet dropping device 10 and the porous material 20, or a duct for guiding the generated aerosol to the outside.

A specific embodiment of the aerosol generating device will be described later.

Aerosol generator

An apparatus for generating an aerosol can be implemented by the above-described method for generating an aerosol. The present invention does not specifically limit the aerosol generating device, but as shown in FIG. 6, the aerosol generating device 30 according to an embodiment of the present invention includes a main body 31 forming an exterior and a main body 31 The porous material 20 located in the inner and lower portions, the liquid 33 stored in the inner upper receiving space of the main body 31, and the nozzle 34 formed in the lower portion of the receiving space so that the liquid stored in the receiving space can fall downward. ) Can be included.

The handle 36 that can be gripped by the user may be combined with the pressure plate 35 on the upper part of the receiving space, and the internal pressure of the receiving space is increased by the pressure applied by the user, and thus the receiving space through the nozzle 34 The liquid stored therein can fall by gravity in the form of droplets. The aerosol 32 is generated by droplets falling onto the porous surface.

The body 31 may include an inlet 38 through which outside air can be introduced into the inside, and an outlet 39 through which the outside air can be discharged outside through the inside of the body 31, and an aerosol 32 is generated. After that, the generated aerosol 32 may be discharged to the outside through the outlet 39 by the outside air introduced through the inlet 38.

Here, the inlet 38 is located at the bottom of the main body 31, and the outlet 39 is located at the upper part of the main body 31, so that the aerosol 32 dispersed on the porous surface is efficiently provided to the outside in a floating state. It is desirable to make it possible.

Since the method of generating the aerosol or the specific method of controlling the generated aerosol is the same as described above, a detailed description thereof will be omitted.

In the above, preferred embodiments of the present invention have been described in detail with reference to the drawings. The description of the present invention is for illustrative purposes only, and a person of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning, scope, and equivalent concepts of the claims are included in the scope of the present invention. It must be interpreted.

10: droplet dropping device 11: droplet
12: aerosol 13: microbubbles
20: porous material 30: aerosol generating device
31: main body 32: aerosol
33: liquid (drug) 34: nozzle
35: pressure plate 38: inlet
39: outlet

Claims (13)

Dropping freely on the porous surface by gravity; And
Dispersing an aerosol from the porous surface into the air by an impact between the droplet and the porous surface;
Aerosol generating method comprising a. The method of claim 1,
The free fall step,
The method of generating an aerosol, characterized in that the speed at which the droplets collide on the porous surface changes according to a change in a distance at which the droplets fall to the porous surface. The method of claim 1,
In the free falling step, a functional material is dissolved in the droplet,
An aerosol generating method, characterized in that the functional substance is dissolved in the aerosol. The method of claim 1,
The step of dispersing the aerosol,
The method of generating an aerosol, characterized in that the functional material has penetrated into the porous surface, and the functional material is dissolved in the aerosol. The method of claim 1,
The step of dispersing the aerosol,
The method of generating an aerosol, characterized in that the size distribution and generation amount of the aerosol are changed according to changes in the size, surface tension, or viscosity of the droplets colliding with the porous surface. The method of claim 1,
The step of dispersing the aerosol,
The droplet collides with the porous surface and expands in a contact surface direction, and when the expanded droplet reaches a maximum diameter, microbubbles are mixed into the interface between the expanded droplet and the porous surface, and a part of the expanded droplet Although the height of the expanded droplet is reduced by being absorbed by the porous surface, the microbubbles grow in size due to the air contained in the porous surface, and the microbubbles are the expanded droplet and the air on the surface of the expanded droplet. The method of generating an aerosol, characterized in that it ruptures while meeting the interface therebetween to generate fine spray water. The method of claim 6,
The number of microbubbles generated in the expanded droplet is proportional to the collision velocity of the droplet against the porous surface. The method of claim 6,
The aerosol generating method, characterized in that the number of microbubbles generated in the expanded droplet is different depending on the material of the porous surface. The method of claim 6,
The height of the expanded droplet is inversely proportional to the impact velocity of the droplet on the porous surface. The method of claim 6,
The height of the expanded droplet, the method of generating an aerosol, characterized in that different depending on the material of the porous surface. The method of claim 6,
The aerosol generating method, characterized in that the size distribution and the amount of the aerosol differ depending on the temperature of the porous surface. The method of claim 1,
After the step of dispersing the aerosol, moving the aerosol by the introduced outside air;
Aerosol generating method, characterized in that it further comprises. A main body forming the exterior;
A porous material located in the inner and lower portions of the body;
Liquid stored in the receiving space of the inner upper part of the main body; And
A nozzle located under the receiving space to provide the liquid stored in the receiving space in the form of droplets as the porous material;
Including,
The main body includes an outlet for discharging the aerosol generated by impacting the porous material by the droplets falling through the nozzle to the outside of the main body, and air outside the main body to guide the generated aerosol to the outlet. An aerosol generating device comprising an inlet through which the body is introduced.

Images