Aerosol size control core, and aerosol size control nebulization device

Abstract

An aerosol size control core for cooperating with a nebulization unit (4), and an aerosol size control nebulization device. The aerosol size control core comprises an enveloping unit (1), which is configured to envelop an aerosol generated by the nebulization unit (4) and defines an aerosol space (S) inside to create a controlled flow environment, wherein the enveloping unit (1) has at least one aerosol outlet (13), which is in communication with the aerosol space (S) and is configured to direct the aerosol of a preset particle size range in the aerosol space (S) out of the enveloping unit (1); and the enveloping unit (1) is configured such that the flow direction of droplets condensed from the aerosol in the aerosol space (S) is different from the flow direction of the aerosol directed out of the enveloping unit (1) via the at least one aerosol outlet (13). The aerosol size control nebulization device comprises the nebulization unit (4) and the aerosol size control core.

Description

Aerosol size control core and aerosol device with the same

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Patent Application No. 63 / 713,598, filed on October 30, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to an aerosol device, and in particular, to an aerosol size control core for an aerosol device and an aerosol device with the same. BACKGROUND

[0004] Past nebulization devices are relying on aerosol generating elements to generate aerosol, thus the aerosol particle size is determined when the aerosol is generated. For example, a micro mesh nebulization device is relying on a micro mesh to determine the aerosol particle size, while a jet or ultrasonic nebulization device is relying on the mode of impact to determine the aerosol particle size. Such design results in uneven distribution of the aerosol particle size of the existing nebulization device, or the cost of controlling the aerosol particle size is very high.

[0005] In addition, the prior art has a normal distribution of particle size during the generation of aerosol, which makes the overall aerosol particle size large, and cannot further produce smaller aerosol particle size, nor can it do more effective deep lung treatment. SUMMARY

[0006] In order to improve the problems of the prior art, the present disclosure proposes an aerosol size control core for an aerosol device, and an aerosol device with the same.

[0007] To achieve the above object and other objects, the present disclosure proposes an aerosol size control core for an aerosol device, comprising: a covering unit configured to cover aerosol generated by an aerosol unit, the covering unit defining an internal aerosol space to form a controlled flow environment, wherein the covering unit has at least one aerosol outlet, the at least one aerosol outlet being in communication with the aerosol space, and the at least one aerosol outlet being configured to guide aerosol of a predetermined particle size range in the aerosol space out of the covering unit, and the covering unit being configured to make the flow direction of the aerosol condensed in the aerosol space different from the flow direction of the aerosol guided out of the covering unit through the at least one aerosol outlet.

[0008] Optionally, the at least one aerosol outlet is arranged on a top surface, a side surface or a bottom surface of the covering unit.

[0009] Optionally, a particle size screening structure is further included, which is arranged in the aerosol space, and is used to prevent aerosols with a particle size greater than the preset particle size range from passing through the at least one aerosol outlet.

[0010] Optionally, the particle size screening structure includes one of a flow guide surface, a baffle, or a micro mesh.

[0011] Optionally, a liquid flow guide part is further included, which is arranged in the covering unit, and includes at least one of an inclined surface, a groove, a convex rib, or a curved surface, or any combination thereof, and is used to cause the aerosols condensed in the aerosol space to flow back to the liquid supply area.

[0012] Optionally, the covering unit has a plurality of aerosol outlets, the number of the particle size screening structures and the liquid flow guide parts is the same as the number of the plurality of aerosol outlets, and the plurality of aerosol outlets, the particle size screening structures, and the liquid flow guide parts are arranged in one-to-one correspondence.

[0013] The present disclosure further provides an atomization device capable of controlling and generating aerosols with smaller particle sizes, which includes an atomization unit used to atomize a liquid to generate aerosols, and a particle size-controllable core according to the above, the aerosol space accommodating or being adjacent to the atomization unit to cover the aerosols generated by the atomization unit.

[0014] Optionally, the atomization unit is one of a pneumatic jet type atomization module, an ultrasonic atomization module, or a micro mesh type atomization module.

[0015] Optionally, the atomization unit is a pneumatic jet type atomization module, and the covering unit has an impact element arranged inside, which is configured to generate primary atomized aerosols by being impacted by high-speed airflow generated by the atomization unit.

[0016] Optionally, the covering unit further has a mounting part, and is arranged in alignment with a nozzle of the atomization unit, and the impact element is arranged in the covering unit in a detachable or fixed manner through the mounting part.

[0017] Optionally, the nozzle of the atomization unit and the covering unit are in an integral molding structure, and the relative position between the nozzle and the covering unit is maintained fixed.

[0018] Therefore, the controllable particle size mechanism disclosed herein utilizes an internal structural design to allow the aerosol within the mechanism to form a preset particle size range before flowing out. Larger particles (outside the preset range) condensed into droplets are then returned to the original liquid supply area via a liquid guide section for re-atomization. This design achieves particle size control by adding the controllable particle size mechanism of this disclosure without altering the original atomizing device structure, thereby reducing development time and cost. The controllable particle size mechanism of this disclosure can also be combined with an atomizing unit to form a controllable particle size atomizing device. Furthermore, the flow direction of the aerosol within the preset particle size range from the aerosol outlet differs from the flow direction of the condensed droplets. This improves upon existing technologies where the produced aerosol and returned liquid flow from the same outlet, resulting in large droplets remaining along the aerosol path (medicine cup, breathing tubing, mask, mouthpiece) and failing to achieve sufficient atomization, leading to medication residue and waste.

[0019] To further understand the features and technical content of this disclosure, please refer to the following detailed description and accompanying drawings. However, these descriptions and drawings are for illustrative purposes only and are not intended to limit the scope of the rights of this disclosure.

[0020] Overview of the attached figures

[0021] Figure 1 is a perspective view of the controllable particle size mechanism according to the first embodiment of this disclosure;

[0022] Figure 2 is a three-dimensional schematic diagram of Figure 1 from another perspective;

[0023] Figure 3 is a cross-sectional schematic diagram of the controllable particle size mechanism according to the first embodiment of this disclosure;

[0024] Figure 4 is an exploded view of the atomizing device with controllable particle size according to the first embodiment of this disclosure;

[0025] Figure 5 is a perspective view of the controllable particle size mechanism according to the second embodiment of this disclosure;

[0026] Figure 6 is a perspective view of the controllable particle size mechanism according to the third embodiment of this disclosure;

[0027] Figure 7 is a perspective view of the controllable particle size mechanism according to the fourth embodiment of this disclosure;

[0028] Figure 8 is a perspective view of the controllable particle size mechanism according to the fifth embodiment of this disclosure;

[0029] Figure 9 is a three-dimensional schematic diagram of the controllable particle size mechanism according to the sixth embodiment of this disclosure;

[0030] Figure 10 shows the drug sedimentation distribution of other brands of nebulizers compared to that disclosed in this invention;

[0031] Figure 11 is a drug particle size distribution diagram of an atomizing device using the controllable particle size mechanism of this disclosure.

[0032] [Figure Reference Numerals] 1. Coating Unit; 11. Top Wall; 12. Side Wall; 13. Aerosol Outlet; 14. Assembly Port; 15. Mounting Part; 16. Through Hole; 2. Particle Size Screening Structure; 3. Liquid Guide Part; 4. Atomizing Unit; 41. Medicine Cup; 42. Venturi Tube; 43. Impacting Element; 431. Nozzle Outlet; 5. Output Pipe; S. Aerosol Space

[0033] Preferred embodiments of this disclosure

[0034] To fully understand this disclosure, the following specific embodiments, in conjunction with the accompanying drawings, will provide a detailed description. Those skilled in the art can understand the purpose, features, and effects of this disclosure from the content disclosed in this specification. It should be noted that this disclosure can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the inventive point of this disclosure. Furthermore, the accompanying drawings are for simple illustration only and are not depictions based on actual dimensions. The following embodiments will further describe the relevant technical content of this disclosure in detail, but the disclosed content is not intended to limit the claims of this disclosure. The following explanation is provided:

[0035] As shown in Figures 1 to 4, the controllable particle size mechanism of the first embodiment of this disclosure is used in conjunction with the atomizing unit 4 to generate aerosol with a preset particle size range. The controllable particle size mechanism includes a coating unit 1.

[0036] The covering unit 1 is used to cover the aerosol generated by the atomizing unit 4, and the covering unit 1 defines an internal aerosol space S to form a controlled flow environment. Referring to FIG1, the covering unit 1 in this embodiment is in the form of a cover, having a top wall 11 and a side wall 12. The top wall 11 and the side wall 12 define the aforementioned aerosol space S to accommodate at least a portion of the atomizing unit 4. The atomizing unit 4 can enter through the assembly port 14 of the covering unit 1 and be assembled with the covering unit 1. However, this disclosure is not limited thereto, and the specific structure of the covering unit 1 can be adjusted as needed. Any element that can cover the aerosol generated by the atomizing unit 4 and have an aerosol space S can be used as the covering unit 1 of this disclosure.

[0037] The coating unit 1 has at least one aerosol outlet 13, which communicates with the aerosol space S and is configured to export aerosol within a preset particle size range from the aerosol space S to the coating unit 1. Specifically, in this embodiment, the top wall 11 has multiple aerosol outlets 13, allowing aerosol with smaller particle sizes falling within a preset particle size range (e.g., less than or equal to 3 micrometers) formed from liquid atomization to pass upwards. Other aerosols with larger particle sizes cannot pass through the aerosol outlets 13 and eventually condense in the aerosol space S, flowing back along the internal wall of the coating unit 1. In other words, only aerosols with sufficiently small particle sizes can pass through the controllable particle size mechanism and be ejected upwards as atomized aerosol. By adjusting parameters such as the size, shape, height, position, number, and distribution of the aerosol outlets 13, the preset particle size range can be determined, thus ensuring that only small-particle-size aerosols with better therapeutic effects and the ability to penetrate deep into the lungs are exported from the coating unit 1 and reach the depths of the lungs. The remaining large-diameter aerosols that do not meet the preset particle size range condense into droplets and flow back to the liquid supply area, which is usually a medicine cup containing liquid medicine. These reflowing droplets can continue to be atomized by the atomizing unit 4, and will not adhere to the cup wall, thus avoiding waste of medicine residue.

[0038] The coating unit 1 of this disclosure is further configured such that the flow direction of the aerosol condensing into droplets in the aerosol space S is different from the flow direction of the aerosol exiting the coating unit 1 via at least one aerosol outlet 13. As shown in Figures 1 to 3, aerosol within a preset particle size range is light enough to flow upward through the aerosol outlet 13, while the remaining aerosol outside the preset particle size range condenses into droplets and flows back along the interior of the coating unit 1 (e.g., the sidewall 12). The aerosol within the preset particle size range does not flow in the same direction as the condensed droplets. Therefore, a particle size limitation is substantially imposed.

[0039] In this embodiment, the aerosol outlet 13 is disposed on the top surface (top wall 11) of the coating unit 1, and the condensed droplets flow to the assembly port 14 (from which they can leave the coating unit 1, or remain in a liquid state in the aerosol space S awaiting re-atomization). However, this disclosure is not limited to this; the aerosol outlet 13 may also be disposed on the side or bottom surface of the coating unit 1, and the flow direction of the condensed droplets may be designed to be different from the flow direction of the aerosol passing through the aerosol outlet 13.

[0040] Further, as shown in Figures 2 and 3, in this embodiment, the controllable particle size mechanism also includes a particle size screening structure 2. The particle size screening structure 2 is disposed in the aerosol space S and is used to prevent aerosol particles larger than a preset particle size range from passing through the aerosol outlet 13. The particle size screening structure 2 includes, for example, a guide surface, a baffle, or a micromesh. Any structure that allows small-sized aerosol particles to pass through and blocks large-sized aerosol particles from passing through the aerosol outlet 13 can be used as the particle size screening structure 2 of this disclosure.

[0041] In this embodiment, the particle size screening structure 2 serves as a guide surface. Only aerosol particles with sufficiently small diameters can bypass the particle size screening structure 2 and exit the coating unit 1 through the aerosol outlet 13. Aerosol particles with larger diameters that cannot bypass the particle size screening structure 2 remain inside the coating unit 1. Therefore, the particle size screening structure 2 filters or retains aerosol particles larger than a preset particle size range to improve the uniformity and efficiency of the output aerosol particle size. Furthermore, by adjusting the length, shape, and opening size of the particle size screening structure 2, the preset particle size range can be adjusted to further limit the particle size of the aerosol output by the controllable particle size mechanism.

[0042] Further, as shown in Figure 3, in this embodiment, the controllable particle size mechanism also includes a liquid guide section 3, disposed in the coating unit 1. The liquid guide section 3 includes at least one inclined surface, groove, rib, or curved surface, or any combination thereof. The liquid guide section 3 is used to allow the aerosol (droplets) condensed in the aerosol space S to flow back to the liquid supply area for re-atomization by gravity or inertia. The liquid guide section 3 can be a structure combined with the particle size screening structure 2, that is, the structure formed by the particle size screening structure 2 and the liquid guide section 3 has the dual purpose of "allowing aerosol with a particle size within a preset particle size range to pass through the aerosol outlet 13, filtering and retaining aerosol larger than the preset particle size range" and "allowing the droplets condensed in the aerosol space S to flow back".

[0043] Furthermore, as shown in Figures 2 and 3, in this embodiment, the coating unit 1 has multiple aerosol outlets 13, and the number of particle size screening structures 2 and liquid guide sections 3 is the same as the number of aerosol outlets 13, so that the multiple aerosol outlets 13, particle size screening structures 2, and liquid guide sections 3 are configured in a one-to-one correspondence. That is, each aerosol outlet 13 is provided with a set of particle size screening structures 2 and liquid guide sections 3 to form multiple sets of independent and parallel atomization paths, thereby improving the overall atomization efficiency and mist exhaust stability.

[0044] Furthermore, as shown in Figure 4, in this embodiment, the controllable particle size core is combined with the atomizing unit 4 to form an atomizing device with controllable particle size.

[0045] The atomizing unit 4 is used to atomize the liquid to produce an aerosol. The aerosol space S accommodates or is adjacent to the atomizing unit 4 to cover the aerosol produced by the atomizing unit 4. The atomizing unit 4 is, for example, one of a pneumatic jet atomizing module, an ultrasonic atomizing module, or a micro-mesh atomizing module. This disclosure does not limit the type of atomizing unit 4.

[0046] Figure 4 shows an atomizing unit 4, exemplified by a pneumatic jet atomizing module. The atomizing unit 4 of this pneumatic jet atomizing module type includes a medicine cup 41, a venturi tube 42, and an impact element 43. The venturi tube 42 and its gas nozzle outlet 431 provide the power for the high-speed impact of the gas. The impact element 43 can be formed in various ways. In this embodiment, the impact element 43 is fixedly formed at one end of the venturi tube 42 and then assembled inside the covering unit 1. However, this disclosure is not limited to this; the impact element 43 can also be directly formed inside the covering unit 1, or the impact element 43 can be an independent component connected to the covering unit 1 and the venturi tube 42 through assembly. The assembly method, formation method, and specific shape and size of the impact element 43 can be appropriately varied as needed, and this disclosure is not limited to the implementation of the impact element and impact surface.

[0047] When the gas ejected from nozzle outlet 431, carrying liquid, impacts the impact element 43 located inside the coating unit 1, it generates droplets of numerous sizes. Only droplets with sufficiently small particle sizes can bypass the particle size screening structure 2 and exit the atomizing device with controllable particle size disclosed herein through the atomization outlet 13. In other words, the impact element 43 is configured to generate primary atomized atomized mist by being impacted by the high-speed airflow generated by the atomizing unit 4.

[0048] Furthermore, in this embodiment, the atomizing device with controllable particle size also includes an output pipe 5. The output pipe 5 is connected to the aerosol outlet 13 to deliver aerosol with a preset particle size range exported from the aerosol outlet 13 to the human body.

[0049] Further, as shown in Figures 2 and 3, in this embodiment, the coating unit 1 also has a mounting portion 15, which is aligned with the impact element 43 of the atomizing unit 4. The impact element 43 is disposed on the coating unit 1 via the mounting portion 15 in a detachable or fixed manner. In this embodiment, the mounting portion 15 is, for example, a groove (mounting seat) whose shape matches that of the impact element 43. In other embodiments, the mounting portion 15 may also be, for example, a mounting hole, to accordingly mount the impact element 43.

[0050] Furthermore, as shown in Figure 9, in the sixth embodiment of this disclosure, the nozzle outlet 431 of the atomizing unit 4 and the coating unit 1 are integrally formed, thus maintaining a fixed relative position between the nozzle outlet 431 and the coating unit 1. Therefore, there is no relative displacement between the two, which can improve the operational stability of the device and the consistency of atomization quality.

[0051] This disclosed nebulizer uses a controllable particle size mechanism paired with a pneumatic jet nebulization module, capable of outputting an aerosol with a mass median aerodynamic diameter (MMAD) of less than 3 micrometers. In other words, half the mass of the aerosol is less than 3 micrometers. This allows most of the aerosol particles to penetrate deep into the respiratory tract, reaching the lungs, rather than remaining only in the mouth and upper respiratory tract. Therefore, it provides more effective nebulization therapy and reduces the burden of inhaling excessive medication.

[0052] The controllable particle size mechanism of this disclosure filters the primary atomized aerosol within the coating unit 1. Through the structural design of the coating unit 1, the primary atomized aerosol is divided into two parts: one part, with a non-preset particle size, flows back to the liquid, while the other part, with a preset particle size, leaves the coating unit 1 through the aerosol outlet 13. This mechanism prevents condensed droplets from adhering to other areas outside the coating unit 1, thus avoiding liquid recirculation and re-atomization (reducing the drug delivery rate). Furthermore, the structural design within the coating unit 1 allows control over the particle size and concentration of the atomized aerosol, improving upon existing atomization devices that suffer from excessively wide particle size distribution, excessive liquid residue, and intermittent and unstable atomization. Further, as shown in FIG5, in the second embodiment of the controllable particle size mechanism proposed in this disclosure, the impact element 43 is directly formed on the top wall 11. The remaining portion is hollowed out to form the aerosol outlet 13.

[0053] Furthermore, as shown in FIG6, the present disclosure proposes a third embodiment of a controllable particle size mechanism, the main difference of which from the first embodiment lies in the shape and number of aerosol outlets 13, as well as the style of the particle size screening structure 2 and the liquid guide section 3. In the third embodiment, the number of aerosol outlets 13 is six. Each aerosol outlet 13 in the third embodiment has a set of particle size screening structure 2 and liquid guide section 3.

[0054] Furthermore, as shown in FIG7, the present disclosure proposes a fourth embodiment of a controllable particle size mechanism, the main difference of which is that the coating unit 1 has through holes 16, and each aerosol outlet 13 surrounds the through holes 16. The purpose of the through holes 16 is to allow for the installation and integration with the bottle body and impact element (external element) of an existing atomizing device to generate atomized droplets.

[0055] Furthermore, as shown in FIG8, the fifth embodiment of the controllable particle size mechanism disclosed herein differs primarily from the aforementioned embodiments in that it has only a single aerosol outlet 13, and this aerosol outlet 13 also serves as the aforementioned through-hole 16. In other words, the fifth embodiment of the controllable particle size mechanism is also intended for direct integration into existing atomizing devices, with the impact element (external element) directly disposed in the single aerosol outlet 13. The aerosol generated by the impact element bypasses the particle size screening structure 2 and passes through the aerosol outlet 13, thus achieving particle size screening and control. In the fifth embodiment, multiple sets of particle size screening structures 2 and liquid guide sections 3 are used together for a single aerosol outlet 13.

[0056] The above embodiments demonstrate that the controllable particle size mechanism and controllable particle size atomizing device of this disclosure can exhibit diverse structures. The impact element 43 can be an internal component or integrated into existing atomizing device products (external component). The impact surface of the impact element 43 can be designed in different shapes, such as a plane, a concave surface, or a crossbar, to generate aerosol. By designing the size, shape, number, and placement of the aerosol outlet 13, the particle size, particle size concentration, and atomization rate of the aerosol can be controlled, thereby determining the preset particle size range.

[0057] Experimental verification

[0058] To verify that the controllable particle size mechanism and controllable particle size atomizing device disclosed herein are indeed superior to many existing atomizing devices, this disclosure provides the following test report. The performance of commercially available jet small volume nebulization devices was tested in terms of aerosol particle size distribution after high-pressure gas atomization, atomization speed, and remaining medication in the medicine cup.

[0059] Test items:

[0060] 1. Test the following small spray cans

[0061] AG Company Small Spray Bottles

[0062] BP small spray bottles

[0063] C. The atomizing device with controllable particle size disclosed herein

[0064] 2. Measure the particle sizing of the spray can based on the Annex D smoke density test.

[0065] Test standard: Annex D (Test methods for particle sizing) of ISO 27427:2013.

[0066] Research conditions: In accordance with ISO standards, the room temperature was maintained at 23±2℃ and the relative humidity was 45-75%.

[0067] Research Instruments and Settings: Based on the Annex D smoke density standard, a next-generation impactor (MSP, Shoreview, Minnesota) was used. The operating flow rate was calibrated using a dry gas flow meter (TSI Instrument Inc. Shoreview, Minnesota, Model 4040) and was 15.0 ± 0.1 L / min. The collection stage consisted of 8 stages. After calibration experiments, the particle sizes of the collected aerosols were 14.10 μm, 8.61 μm, 5.39 μm, 3.30 μm, 2.08 μm, 1.36 μm, 0.98 μm, and <0.5 μm, respectively.

[0068] Water used for reagents: Research-grade double-filtered water

[0069] Trial reagent: 0.1% Salbutamol sulfate (Xindong Company)

[0070] Drug dosage analysis: The absorbance of the samples was measured using a UV-Vis Spectrophotometer (ThermoScitific Inc., Waltham, MA USA) at a wavelength of 276 nm. Before the experiment, a solution of the drug with a known concentration was prepared, placed in the spectrophotometer, and the absorbance was obtained. The relevant calculation formula was then derived to calculate the subsequent sample concentration.

[0071] Test program:

[0072] A. The suction flow rate of the impact sampler was confirmed to be 15.0 ± 10% L / min using a TSI flow meter.

[0073] B. 0.2% salbutamol, use a micropipette to draw 2.5 mL (5 mg) into the medicine cup.

[0074] C. 50 psig oxygen with TSI flow meter to calibrate / confirm the set flow rate.

[0075] D. Turn on the oxygen to the specified flow rate and start spraying.

[0076] E. Spray until no more aerosol is produced, and record the spraying time.

[0077] F. Disassemble the impactor, add secondary water to each stage to dissolve and extract the drug, shake for two minutes to extract the drug.

[0078] G. Measure the absorbance of the extracted drug solution using a spectrophotometer, and calculate the drug dosage using the formula "absorbance-concentration".

[0079] H. Input the mass data of each sedimentation stage into a dedicated program to calculate the sedimentation drug distribution and obtain MMAD, geometric standard deviation (GSD), and the proportion of inhalable particles.

[0080] The test results are shown in Figure 10. Figure 10 is a comparison of the drug accumulation curves of the small-volume spray bottle from Company G, the small-volume spray bottle from Company P, and the nebulizer with the controllable particle size mechanism of this disclosure. Figure 11 is a drug particle size distribution diagram of the nebulizer using the controllable particle size mechanism of this disclosure.

[0081] The test results show that the atomizing device using the controllable particle size mechanism of this disclosure produces droplet sizes significantly smaller than the control group (small-volume spray bottles from G Technology Company and P Company). Notably, over 96% of the atomized droplets produced by the atomizing device using the controllable particle size mechanism of this disclosure are 1.36 μm or smaller. The test results above demonstrate that the controllable particle size mechanism of this disclosure has a significant effect on reducing the aerosol droplet size (from 5.03 μm to 1.54 μm) and increasing the number of droplets with the smallest particle size.

[0082] This disclosure has been described above with reference to preferred embodiments. However, those skilled in the art should understand that the embodiments are for illustrative purposes only and should not be construed as limiting the scope of this disclosure. It should be noted that any variations and substitutions equivalent to the described embodiments should be included within the scope of this disclosure. Therefore, the scope of protection of this disclosure is determined by the claims.

Claims

1. A controllable particle size actuator for use with an atomizing unit, characterized in that, The controllable particle size mechanism includes: A coating unit is used to coat the aerosol produced by the atomizing unit, and the coating unit defines an internal aerosol space to create a controlled flow environment. The coating unit has at least one aerosol outlet, which communicates with the aerosol space, and is configured to export aerosol of a predetermined particle size range from the aerosol space to the coating unit. The coating unit is configured such that the flow direction of the aerosol condensing into droplets in the aerosol space is different from the flow direction of the aerosol exiting the coating unit via the at least one aerosol outlet.

2. The controllable particle size mechanism according to claim 1, characterized in that, The at least one aerosol outlet is disposed on the top, side or bottom surface of the covering unit.

3. The controllable particle size mechanism according to claim 1, characterized in that, It also includes a particle size screening structure, which is disposed in the aerosol space and is used to prevent aerosol particles with a particle size larger than the preset particle size range from passing through the at least one aerosol outlet.

4. The controllable particle size mechanism according to claim 3, characterized in that, The particle size screening structure includes one of the following: a guide surface, a baffle, or a micromesh.

5. The controllable particle size mechanism according to claim 4, characterized in that, It also includes a liquid guide section disposed in the covering unit. The liquid guide section includes at least one inclined surface, groove, rib or curved surface, or any combination thereof. The liquid guide section is used to allow the aerosol condensed in the aerosol space to flow back to the liquid supply area.

6. The controllable particle size mechanism according to claim 4, characterized in that, The coating unit has multiple aerosol outlets, and the number of particle size screening structures and liquid guides is the same as the number of multiple aerosol outlets, so that the multiple aerosol outlets, the particle size screening structures and the liquid guides are configured in a one-to-one correspondence.

7. An atomizing device with controllable particle size, characterized in that, The atomizing device with controllable particle size includes: Atomizing unit, used to atomize liquid to produce a mist; and According to any one of claims 1 to 6, the controllable particle size mechanism, wherein the atomizing space contains or is adjacent to the atomizing unit to cover the atomization generated by the atomizing unit.

8. The atomizing device with controllable particle size according to claim 7, characterized in that, The atomizing unit is one of a pneumatic jet atomizing module, an ultrasonic atomizing module, or a micro-mesh atomizing module.

9. The atomizing device with controllable particle size according to claim 8, characterized in that, The atomizing unit is a pneumatic jet atomizing module. The encapsulation unit is equipped with an impact element inside. The impact element is configured to generate primary atomized mist by being impacted by the high-speed airflow generated by the atomizing unit.

10. The atomizing device with controllable particle size according to claim 9, characterized in that, The coating unit also has a mounting part, which is aligned with the nozzle of the atomizing unit. The impact element is mounted on the coating unit via the mounting part in a detachable or fixed manner.

11. The atomizing device with controllable particle size according to claim 8, characterized in that, The nozzle of the atomizing unit and the coating unit are integrally formed, and the relative position of the nozzle and the coating unit remains fixed.

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