Nebulizer and hosing assembly thereof

Abstract

This invention discloses an atomizer, comprising a main unit, a housing assembly, a cup body, and an atomizing module. The housing assembly includes a housing and a resilient shielding member. The housing is joined to the main unit and has an air chamber inside. The housing includes a nozzle orifice, and its sidewall has multiple openings that communicate with the nozzle orifice through the air chamber. The resilient shielding member is disposed on the sidewall of the housing, shielding at least one of the openings. The cup body is joined to the housing. The cup body has a liquid storage chamber inside. The bottom of the cup body has a through hole communicating with the liquid storage chamber, which in turn communicates with the air chamber. The atomizing module is disposed inside the cup body and directly above the through hole. The resilient shielding member dynamically adjusts the flow rate of the airflow through the openings based on the direction of the airflow entering and exiting the nozzle orifice.

Description

[Technical Field]

[0001] This invention relates to a nebulizer and its housing assembly, and more particularly to a nebulizer and its housing assembly that improves the breathing pattern of a user. [Previous Technology]

[0002] Generally speaking, when operating a nebulizer, if a user wants to increase the amount of drug aerosol particles deposited in the lungs to enhance the therapeutic effect, in addition to adjusting the aerosol particle size (MMAD) of the nebulized drug to control its deposition in a specific area of ​​the lungs, they can also further increase the deposition ratio of aerosol particles in the lungs by using a deep and slow breathing rhythm.

[0003] To guide users to use nebulizers with a stable and slow breathing rhythm, a common method is to reduce the size of the nebulizer's air inlet to increase airflow resistance during inhalation. However, while this design can encourage users to slow down their inhalation, it also increases airflow resistance during exhalation, which may cause discomfort when using the nebulizer and even affect the tolerance to long-term treatment.

[0004] Therefore, how to overcome the above-mentioned defects by improving the structural design of the internal airflow channel of the atomizer has become one of the important issues to be solved in this field. [Summary of the Invention]

[0005] The technical problem to be solved by the present invention is to provide a nebulizer and its housing assembly to address the shortcomings of the prior art, so as to solve the technical problem that the existing nebulizers cannot reduce the impact on the user's breathing comfort while improving the therapeutic effect.

[0006] To solve the above-mentioned technical problems, one of the technical solutions adopted by the present invention is to provide an atomizer, which includes a main unit, a housing assembly, a cup body, and an atomizing module. The housing assembly includes a housing and an elastic shielding member. The housing is joined to the main unit, and the housing has an air chamber inside. The housing includes a nozzle orifice, and the side wall of the housing has a plurality of openings, which communicate with the nozzle orifice through the air chamber. The elastic shielding member is disposed on the side wall of the housing. The elastic shielding member shields at least one of the openings, wherein the elastic shielding member is used to dynamically adjust the flow rate of the airflow through the openings by being affected by the direction of the airflow entering and exiting the nozzle orifice. The cup body is joined to the housing. The cup body has a liquid storage chamber inside. The bottom of the cup body has a through hole communicating with the liquid storage chamber, and the liquid storage chamber communicates with the air chamber through the through hole. The atomizing module is disposed inside the cup body and is located directly above the through hole.

[0007] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a housing assembly, which includes a housing and an elastic shielding member. The housing has an internal air chamber, a nozzle orifice, and a plurality of openings on its sidewall, which communicate with the nozzle orifice through the air chamber. The elastic shielding member is disposed on the sidewall of the housing, and shields the outside of at least one of the openings. The elastic shielding member is used to dynamically adjust the flow rate of the airflow through the openings in response to the direction of the airflow entering and exiting the nozzle orifice.

[0008] One of the beneficial effects of the present invention is that the nebulizer and its housing assembly provided by the present invention can utilize an elastic shielding member to cover the outside of at least one of the openings, so that the elastic shielding member can cover or open at least one of the openings according to different directions of airflow entering and exiting the nozzle, thereby dynamically adjusting the flow rate of airflow through the openings. Therefore, when the user inhales through the nebulizer, the airflow direction causes the elastic shielding member to partially cover the opening, thereby increasing inhalation resistance and guiding the user to inhale the nebulized medication at a slower and more stable rhythm. Conversely, when the user exhales, the airflow direction keeps the elastic shielding member open and does not cover the opening, thereby avoiding increased exhalation resistance and ensuring the user's breathing comfort. This design improves the therapeutic effect while reducing discomfort during inhalation and exhalation, enhancing the user's therapeutic experience.

[0009] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention.

Implementation Method

[0030] The following describes the embodiments of the "atomizer and housing assembly" disclosed in this invention through specific examples. Those skilled in the art can understand the advantages and effects of this invention from the content disclosed in this specification. This invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of this invention. In addition, the accompanying drawings of this invention are only simple illustrations and are not depictions based on actual dimensions, as stated in advance. The following embodiments will further describe the relevant technical content of this invention in detail, but the disclosed content is not intended to limit the scope of protection of this invention. In addition, it should be understood that although terms such as "first," "second," and "third" may be used herein to describe various elements, these elements should not be limited by these terms. These terms are mainly used to distinguish one element from another. In addition, the term "or" used herein may include, depending on the actual situation, any combination of any one or more of the associated listed items.

[0031] [First Embodiment]

[0032] Referring to Figures 1 to 3, the first embodiment of the present invention provides an atomizer D, which mainly includes a housing assembly M1, a main unit 3 and a cup body 4, and the housing assembly M1 includes a housing 1 and an elastic shielding member 2.

[0033] Referring to Figures 4 and 5, the housing 1 includes a nozzle port 13, a top interface 15, and a bottom interface 16. The cup body 4 is connected to the housing 1 via the top interface 15, and the main unit 3 is connected to the housing 1 via the bottom interface 16. The interior of the housing 1 is hollow and has an air chamber C1. The side wall 1S of the housing 1 has multiple openings, which communicate with the nozzle port 13 through the air chamber C1.

[0034] Referring to Figures 3 to 5, specifically, these openings can be further divided into first openings 11 and second openings 12. The present invention is not limited by the number of first openings 11 and second openings 12. In the first embodiment, there are two first openings 11 and one second opening 12, with the second opening 12 located between the two first openings 11. Furthermore, these openings (two first openings 11 and one second opening 12) and the nozzle opening 13 are located on opposite sides of the housing 1. The first openings 11 and second openings 12 mainly serve as inlet / outlet air ports to ensure airflow within the air chamber C1.

[0035] The cup body 4 has a liquid storage chamber C2 inside for storing liquid medicine (not shown in the figure). The bottom of the cup body 4 has a through hole 40 communicating with the liquid storage chamber C2. The liquid storage chamber C2 is interconnected with the air chamber C1 through the through hole 40. The nebulizer D also includes a nebulizing module 5. The nebulizing module 5 is disposed inside the cup body 4 and located directly above the through hole 40. For example, the nebulizing module 5 may be made of piezoelectric ceramic material, which can generate high-frequency vibration under appropriate voltage drive to atomize the liquid medicine into an aerosol (not shown in the figure). After the liquid medicine is atomized into an aerosol by the nebulizing module 5 through the through hole 40, it is stored in the air chamber C1 and then inhaled into the upper respiratory tract and lungs by the user (not shown in the figure) through the nozzle 13.

[0036] Referring to Figures 5 to 7, the elastic shielding member 2 is disposed on the side wall 1S of the housing 1 and shields the second opening 12. Specifically, the side wall 1S of the housing 1 is also provided with a locking hole 14, and the elastic shielding member 2 has a fastener 21, the shape and position of which correspond to the shape and position of the locking hole 14. The elastic shielding member 2 is fixed to the side wall 1S by the fastener 21 being engaged with the locking hole 14. It should be noted that in this invention, the number of fasteners 21 and locking holes 14 is not limited. For example, the material of the elastic shielding member 2 can be silicone, thermoplastic elastomer (TPE), or polyurethane (PU), etc., and this invention is not limited thereto.

[0037] In the first embodiment, the elastic shielding member 2 is a single piece. Further, as shown in Figures 5 and 6, the projected area of ​​the elastic shielding member 2 onto the side wall 1S of the housing 1 completely overlaps with the second opening 12, and the elastic shielding member 2 shields the outside of the second opening 12. That is, the second opening 12 is completely covered by the projected area of ​​the elastic shielding member 2 onto the side wall 1S of the housing 1 (i.e., the projected area of ​​the elastic shielding member 2 is greater than or equal to the aperture size of the second opening 12). Therefore, referring to Figure 8 (which can be combined with Figure 4), when the user inhales through the nozzle 13 and inhales the aerosol in the air chamber C1 into their body, the airflow in the air chamber C1 flows towards the nozzle 13 (see the airflow direction N1 in Figure 8), causing the elastic shielding member 2 to be pulled tightly against the second opening 12 by the airflow.

[0038] Because the second opening 12 is completely covered by the elastic shielding member 2, and the elastic shielding member 2 is tightly fitted to the second opening 12, external air cannot enter the air chamber C1 inside the housing 1 through the second opening 12, which increases the resistance when the user inhales. In this situation, in order to smoothly inhale the aerosol (nebulized drug solution), the user will naturally adjust their breathing rhythm and adopt a slower and deeper inhalation method. This inhalation mode not only helps the aerosol to enter the respiratory tract smoothly, but also promotes the aerosol to penetrate deep into the lungs, so that the drug particles can be deposited more effectively in the lung tissue, thereby improving the efficacy of the drug. In addition, appropriate inhalation resistance can also help the user maintain a stable inhalation rate, avoid premature deposition of aerosol particles in the mouth or throat due to excessively rapid inhalation, and improve the delivery efficiency of the drug.

[0039] On the other hand, referring to Figure 9 (which can be combined with Figure 4), when the user exhales from the nozzle 13, the airflow flows toward the first opening 11 and the second opening 12 on the housing 1 (see airflow direction N2 in Figure 9). Since the elastic shield 2 is elastic and sheet-like, it will open when pushed by the airflow, exposing the second opening 12, thereby allowing the exhaled airflow to be discharged smoothly. In other words, when the user exhales, the elastic shield 2 does not cover the second opening 12, thus effectively reducing exhalation resistance, ensuring smooth breathing, and improving overall user comfort. In addition, this design can also prevent pressure buildup inside the housing 1 of the atomizer D due to exhalation, avoiding affecting the atomization effect during the next inhalation, thereby improving the stability and performance of the atomizer D. In other words, the elastic shield 2 dynamically adjusts the flow rate of the airflow through the openings based on the direction of the airflow entering and exiting the nozzle 13, and the function of the elastic shield 2 is equivalent to a one-way valve (allowing airflow to pass through in only one direction).

[0040] [Second Embodiment]

[0041] Referring to Figures 10 to 13, a second embodiment of the present invention provides a housing assembly M2. The structure of the housing assembly M2 in the second embodiment is similar to that of the housing assembly M1 in the first embodiment, and the similarities will not be repeated. The main difference is that the elastic shielding member 2 in the second embodiment has a different structural shape than that in the first embodiment. Therefore, the housing assembly M2 of the second embodiment is also applicable to the atomizer D described in the first embodiment (see Figures 1 to 4), that is, the housing assembly M2 of the second embodiment can replace the housing assembly M1 in the first embodiment.

[0042] Mainly, the housing assembly M2 includes a housing 1 and an elastic shielding member 2. The side wall 1S of the housing 1 is provided with two first openings 11 and one second opening 12, the second opening 12 being located between the two first openings 11, and the elastic shielding member 2 shielding the second opening 12. Further, in the second embodiment, the side wall 1S of the housing 1 is also provided with two locking holes 14, the second opening 12 being located between the two locking holes 14. The elastic shielding member 2 also has two fasteners 21 corresponding to the two locking holes 14. The elastic shielding member 2 is fixed to the housing 1 by being respectively locked into the two locking holes 14 by the two fasteners 21. In addition to the two fasteners 21, the elastic shielding member 2 also includes a hollow frame 22 and a shielding sheet 23, the shielding sheet 23 being elastic and thin. Two fasteners 21 are set on the hollow frame 22, the first end 231 on the upper side of the shielding plate 23 is connected to the hollow frame 22, and the second end 232 on the lower side of the shielding plate 23 is a free end.

[0043] Referring to Figures 13 to 15, when the user inhales through the nozzle 13 and inhales the aerosol in the air chamber C1, the airflow in the air chamber C1 flows toward the nozzle 13 (see airflow direction N1 in Figure 14). This causes the shielding plate 23 of the elastic shielding member 2 to be pulled tightly against the second opening 12 by the airflow. External air cannot pass through the second opening 12 into the air chamber C1 inside the housing 1, resulting in increased flow resistance. This guides the user to adjust their breathing rhythm and adopt a slower and deeper inhalation method. On the other hand, when the user exhales from the nozzle 13, the airflow flows toward the first opening 11 and the second opening 12 (see airflow direction N2 in Figure 15). The shielding plate 23 of the elastic shielding member 2 is pushed open by the airflow, exposing the second opening 12, thereby allowing the exhaled airflow to be discharged smoothly, effectively reducing exhalation resistance and ensuring smooth breathing.

[0044] Furthermore, referring to Figure 16, in order to further promote airflow between the inside and outside of the housing 1, the elastic shielding member 2 is also provided with an air hole 20 on its shielding plate 23, and the second opening 12 is connected to the air hole 20, so that when the user inhales, a guiding airflow can still be generated in the center of the air chamber C1 through the air hole 20, thereby increasing the guiding effect of the aerosol in the air chamber C1. It should be noted that the aperture size of the air hole 20 is much smaller than that of the first opening 11 and the second opening 12, so that the elastic shielding member 2 can maintain its effect of shielding the second opening 12 to increase the suction resistance.

[0045] [Third Embodiment]

[0046] Referring to Figures 17 and 18, the third embodiment of the present invention provides a housing assembly M3 suitable for an atomizer D. The structure of the housing assembly M3 in the third embodiment (including a housing 1 and an elastic shielding member 2) is similar to that of the housing assembly M1 in the first embodiment, and the similarities will not be repeated. The main difference is that the structural shape of the housing assembly M3 in the third embodiment is different from that in the first embodiment.

[0047] In Figures 17 and 18, the housing 1 has two first openings 11 and two second openings 12, and the opening directions of the first openings 11 and the second openings 12 are different. The two first openings 11 are provided on the side wall 1S of the housing 1, and are located on opposite sides of the housing 1, respectively, with the nozzle opening 13. Referring to Figures 4 and 19, the housing 1 further has a partition wall P. The partition wall P is provided inside the nozzle opening 13 and extends rearward to separate the top interface 15 and the bottom interface 16. The hollow space above the partition wall P forms an air chamber C1, and the hollow space below the partition wall P forms a sensing chamber R, and a sensing component (not shown) is installed in the sensing chamber R. For example, the sensing component can be a pressure sensor. The air chamber C1 and the sensing chamber R are independent and non-communicating spaces, and the two second openings 12 are connected to the sensing chamber R. Two second openings 12 are located below the nozzle orifice 13 of the housing 1. Therefore, in the third embodiment, the second openings 12 communicate with the sensing chamber R below the partition wall P, and the positions of the two second openings 12 are closer to the nozzle orifice 13 than the position of the first opening 11. The elastic shielding member 2 has two shielding plates 23, which shield the two second openings 12 respectively. In other words, the housing assembly M3 of the third embodiment has a plurality of one-way valves, while the housing assemblies M1 and M2 of the first and second embodiments have one one-way valve.

[0048] Referring to Figures 17, 19, and 20, when the user inhales through the nozzle 13, the airflow in both the air chamber C1 and the sensing chamber R flows toward the nozzle 13. At this time, the two shielding plates 23 located below the sensing chamber R are pulled by the airflow and press tightly against the second opening 12. External air cannot enter the sensing chamber R inside the housing 1 through the second opening 12, resulting in increased flow resistance. This guides the user to adjust their breathing rhythm and adopt a slower and deeper inhalation method. On the other hand, when the user exhales through the nozzle 13, the airflow flows toward the first opening 11 on the air chamber C1 side and the second opening 12 on the sensing chamber R side. At this time, the two shielding plates 23 located below the sensing chamber R are pushed open by the airflow, exposing the second opening 12, thereby allowing the exhaled airflow to be discharged smoothly, effectively reducing exhalation resistance and ensuring smooth breathing.

[0049] [Beneficial Effects of the Embodiments]

[0050] Existing nebulizers are often designed to simultaneously improve therapeutic efficacy and user comfort. While increasing inspiratory resistance helps increase drug deposition in the lungs, it also increases inspiratory and exhalation airflow resistance, affecting the patient's treatment experience. Therefore, the nebulizer and its housing assembly provided by the present invention can utilize an elastic shielding member to shield the outside of at least one of the openings, so that the elastic shielding member can shield or open at least one of the openings according to different directions of airflow entering and exiting the nozzle, thereby dynamically adjusting the flow rate of airflow through the openings.

[0051] Furthermore, when the user inhales through the nozzle 13 and draws the aerosol from the air chamber into their body, the airflow within the air chamber flows toward the nozzle 13, causing the elastic shielding member 2 to be pulled tightly against the second opening 12 by this airflow. Since the second opening 12 is completely covered by the elastic shielding member 2, and the elastic shielding member 2 is tightly fitted to the second opening 12, external air cannot pass through the second opening 12 into the air chamber within the housing 1, resulting in increased resistance when the user inhales. In this situation, in order to smoothly inhale the aerosol (nebulized drug solution), the user will naturally adjust their breathing rhythm, adopting a slower and deeper inhalation. This inhalation mode not only helps the aerosol enter the respiratory tract smoothly but also promotes the aerosol to penetrate deep into the lungs, allowing the drug particles to be deposited more effectively in the lung tissue, thus enhancing the efficacy of the drug.

[0052] On the other hand, when the user exhales from the nozzle 13, the airflow flows toward the first opening 11 and the second opening 12 on the housing 1. Since the elastic shield 2 is elastic and sheet-like, it will open when pushed by the airflow, exposing the second opening 12 and allowing the exhaled airflow to escape smoothly. In other words, when the user exhales, the elastic shield 2 does not cover these openings, thus effectively reducing exhalation resistance, ensuring smooth breathing, and improving overall user comfort. In addition, this design also prevents pressure buildup inside the housing 1 of the atomizer D due to exhalation, avoiding affecting the atomization effect during the next inhalation, thereby improving the stability and performance of the atomizer D.

[0053] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention. [Simplified Explanation of the Diagram]

[0010] Figure 1 is a first schematic diagram of the atomizer according to the first embodiment of the present invention.

[0011] Figure 2 is a second schematic diagram of the atomizer of the first embodiment of the present invention.

[0012] Figure 3 is an exploded view of the atomizer of the first embodiment of the present invention.

[0013] Figure 4 is a cross-sectional schematic diagram of the atomizer of the first embodiment of the present invention.

[0014] Figure 5 is a first schematic diagram of the housing assembly of the first embodiment of the present invention.

[0015] Figure 6 is a second schematic diagram of the housing assembly of the first embodiment of the present invention.

[0016] Figure 7 is a schematic diagram of the elastic shielding member of the housing assembly according to the first embodiment of the present invention.

[0017] Figure 8 is a cross-sectional schematic diagram of the housing assembly of the first embodiment when the user inhales.

[0018] Figure 9 is a cross-sectional schematic diagram of the shell assembly of the first embodiment when the user exhales.

[0019] Figure 10 is a first schematic diagram of the housing assembly of the second embodiment of the present invention.

[0020] Figure 11 is an exploded view of the housing assembly of the second embodiment of the present invention.

[0021] Figure 12 is a second schematic diagram of the housing assembly according to the second embodiment of the present invention.

[0022] Figure 13 is a schematic diagram of the elastic shielding member of the housing assembly according to the second embodiment of the present invention.

[0023] Figure 14 is a cross-sectional schematic diagram of the housing assembly of the second embodiment when the user inhales.

[0024] Figure 15 is a cross-sectional schematic diagram of the shell assembly of the second embodiment when the user exhales.

[0025] Figure 16 is an exploded view of another embodiment of the housing assembly and elastic shielding member of the second embodiment of the present invention.

[0026] Figure 17 is a partially exploded schematic diagram of the atomizer of the third embodiment of the present invention.

[0027] Figure 18 is a schematic diagram of the atomizer of the third embodiment of the present invention.

[0028] Figure 19 is a schematic diagram of the housing assembly of the third embodiment when the user inhales.

[0029] Figure 20 is a schematic diagram of the housing assembly of the third embodiment when the user exhales.

Claims

1. An atomizer comprising: One host computer; A housing, joined to the main unit, having an air chamber inside the housing, the housing including a nozzle orifice, and a plurality of openings on one side wall of the housing, the openings communicating with the nozzle orifice through the air chamber, such that the air chamber is configured to allow airflow to enter and exit, the openings being further divided into two first openings and at least one second opening, the elastic shielding member shielding the outside of the at least one second opening; an elastic shielding member disposed on the side wall of the housing, the elastic shielding member shielding at least one of the openings; a cup body, joined to the housing, having a liquid storage chamber inside the cup body, the bottom of the cup body having a through hole communicating with the liquid storage chamber, the liquid storage chamber communicating with the air chamber through the through hole; and an atomizing module disposed inside the cup body and located directly above the through hole; wherein, the elastic shielding member is used to dynamically adjust the flow rate of the airflow through the openings as affected by the direction of the airflow entering and exiting the nozzle orifice.

2. The atomizer as described in claim 1, wherein, The two first openings and the nozzle orifice are located on opposite sides of the housing.

3. The atomizer as described in claim 2, wherein, When a user inhales through the nozzle, the airflow in the air chamber flows toward the nozzle, and the elastic shield is pulled by the airflow to press against the at least one second opening.

4. The atomizer as described in claim 2, wherein, When a user exhales into the nozzle, the airflow in the air chamber flows toward the openings, and the elastic shield is pushed open by the airflow, exposing at least one second opening.

5. The atomizer as described in claim 2, wherein, The at least one second opening is completely covered by the projected area of ​​the elastic shielding member projected onto the side wall of the housing.

6. The atomizer as claimed in claim 2, wherein, The number of the second opening is one, located between the two first openings.

7. The atomizer as described in claim 6, wherein, The elastic shielding element has an air hole, and the second opening communicates with the air hole.

8. The atomizer as claimed in claim 2, wherein, There are two second openings, and the two second openings are located below the nozzle orifice, and the two second openings are closer to the nozzle orifice than the first opening.

9. The atomizer as described in claim 8, wherein, The housing has a partition wall disposed inside the nozzle orifice. The hollow space above the partition wall forms the air chamber, and the hollow space below the partition wall forms a sensing chamber. The air chamber and the sensing chamber are independent and non-communicating spaces, and the two second openings are connected to the sensing chamber.

10. The atomizer as claimed in claim 1, wherein, The elastic shielding member has at least one fastener, and the side wall of the housing has at least one locking groove corresponding to the at least one fastener. The elastic shielding member is fixed to the side wall by being engaged with the at least one fastener in the at least one locking groove.

11. A housing assembly comprising: A housing having an internal air chamber, the housing including a nozzle orifice, and a plurality of openings on a side wall of the housing communicating with the nozzle orifice through the air chamber, such that the air chamber is configured to allow airflow to enter and exit; and an elastic shielding member disposed on the side wall of the housing, the elastic shielding member shielding the outside of at least one of the openings; wherein the elastic shielding member is used to dynamically adjust the flow rate of the airflow through the openings in response to the direction of the airflow entering and exiting the nozzle orifice.

12. The housing assembly as claimed in claim 11, wherein, These openings are further divided into two first openings and at least one second opening, with the two first openings and the nozzle orifice located on opposite sides of the housing, and the elastic shielding member shielding the at least one second opening.

13. The housing assembly as claimed in claim 12, wherein, When a user inhales through the nozzle, the airflow in the air chamber flows toward the nozzle, and the elastic shield is pulled by the airflow to press against the at least one second opening.

14. The housing assembly as claimed in claim 12, wherein, When a user exhales into the nozzle, the airflow in the air chamber flows toward the openings, and the elastic shield is pushed open by the airflow, exposing at least one second opening.

15. The housing assembly as claimed in claim 12, wherein, The projected area of ​​the elastic shielding member onto the side wall of the housing completely overlaps with the at least one second opening.

16. The housing assembly as claimed in claim 12, wherein, The number of the second opening is one, located between the two first openings.

17. The housing assembly as claimed in claim 16, wherein, The elastic shielding element has an air hole, and the second opening communicates with the air hole.

18. The housing assembly as claimed in claim 12, wherein, There are two second openings, and the two second openings are located below the nozzle orifice, and the two second openings are closer to the nozzle orifice than the first opening.

19. The housing assembly as claimed in claim 18, wherein, The housing has a partition wall disposed inside the nozzle orifice. The hollow space above the partition wall forms the air chamber, and the hollow space below the partition wall forms a sensing chamber. The air chamber and the sensing chamber are independent and non-communicating spaces, and the two second openings are connected to the sensing chamber.

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