Airway clearance device capable of adaptively adjusting oscillation frequency based on fluid resonance

Abstract

The invention relates to the technical field of respiratory rehabilitation equipment, in particular to an airway clearance device capable of adaptively adjusting oscillation frequency based on fluid resonance, which comprises a shell and a mouthpiece, a dehumidification mechanism is arranged on one side of the shell, a flow guide mechanism is mounted in the shell, the flow guide mechanism divides the space in the shell into an air inlet cavity and a vibration cavity, and the air inlet cavity is communicated with the vibration cavity. The input part and the output part of the dehumidification mechanism are respectively communicated with the mouthpiece and the air inlet cavity through fluid; an oscillation plate mechanism is mounted in the vibration cavity and is in driving connection with the moisture absorption part of the dehumidification mechanism; and a fixed magnet is mounted on the oscillating plate mechanism. In the using process, when the expiration flow is attenuated, the swinging amplitude of the oscillation plate is automatically reduced, so that the vibration frequency is improved, frequency reduction caused by factors such as lung function reduction of a user or insufficient power in the later period of expiration is effectively compensated, the effective treatment time of the device is widened, the duration time of the resonance effect is prolonged, and the treatment effect of the device is improved. Therefore, the continuity and the stability of the treatment effect in a single expiration period are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of respiratory rehabilitation equipment, in particular to an airway clearance device based on fluid resonance for self-adaptive adjustment of oscillation frequency. BACKGROUND

[0002] The oscillating positive expiratory pressure device is a physical therapy equipment widely used in the field of respiratory rehabilitation, and its core mechanism integrates the synergistic effect of positive expiratory pressure therapy and airway oscillation. The main functions include: removing respiratory tract secretions, expanding the lungs, improving lung compliance, and exercising the respiratory muscles. When using the oscillating positive expiratory pressure device, the user blows air into the device by biting the mouthpiece, and the airflow drives the oscillating mechanism inside the device to move repeatedly to generate oscillation, causing the airflow to oscillate. The expiratory obstruction device can generate positive pressure, so the user needs to exert more effort to exhale, increasing the internal pressure of the lungs, which is more conducive to cleaning the secretions in the respiratory tract.

[0003] Chinese Patent No. CN214286212U discloses an electronic power oscillating positive expiratory pressure ventilation device, which includes an expiratory pressure ventilation device and an electronic power oscillating device. The expiratory pressure ventilation device includes a gas pipe with two ends through, and a protective cover plate is detachably fixed to the exhaust end of the gas pipe. The protective cover plate has an exhaust hole, and an expiratory pressure detection and adjustment device is arranged between the protective cover plate and the exhaust end of the gas pipe. The surface of the gas pipe is provided with a display screen connected to the expiratory pressure detection and adjustment device. The power oscillating device includes a shell and a vibration motor arranged in the shell. One side of the shell close to the patient's airway has a movable plate. The device has a simple structure and is easy to use. It can display the expiratory pressure, so that the patient can maintain the best expiratory pressure ventilation mode during treatment. For patients with poor expiratory capacity, the electronic power makes the device oscillate at an effective frequency to achieve better airway clearance effect.

[0004] During the use of the device, a certain amount of exhalation needs to be maintained. However, factors such as population, single exhalation characteristics, and others (for example, severe patients with airway stenosis caused by sputum blockage or bronchospasm, despite the small airflow, and the expiratory flow rate of the user presents a "peak-attenuation" characteristic in a single exhalation cycle) result in a small expiratory flow rate, which causes the oscillation frequency generated by the device to decrease, and the therapeutic effect to weaken. SUMMARY

[0005] To overcome the defects of the prior art, the present application provides an airway clearance device based on fluid resonance for self-adaptive adjustment of oscillation frequency to solve the above problems.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] An airway clearance device based on fluid resonance self-adapting to adjust oscillation frequency, comprising a shell and a mouthpiece, one side of the shell is provided with a dehumidification mechanism, a flow guide mechanism is installed in the shell, the flow guide mechanism divides the space in the shell into an air inlet cavity and a vibration cavity, the input part and the output part of the dehumidification mechanism are respectively in fluid communication with the mouthpiece and the air inlet cavity; an oscillating plate mechanism is installed in the vibration cavity, the oscillating plate mechanism is drivingly connected with the moisture absorption part of the dehumidification mechanism; a fixed magnet is installed on the oscillating plate mechanism, a movable magnet is provided on the inner bottom wall of the vibration cavity, the fixed magnet and the movable magnet are magnetically repulsive;

[0008] The flow guide mechanism comprises a first flow guide piece and a second flow guide piece, the first flow guide piece is fixed in the shell, the first flow guide piece and the second flow guide piece are oppositely arranged and form a flow guide channel, the cross section of the flow guide channel is conical, and the outlet of the flow guide channel is arranged towards the oscillating plate mechanism; a sliding plate mechanism is installed in the shell, the second flow guide piece and the movable magnet are drivingly connected with the sliding plate mechanism.

[0009] Preferably, the oscillating plate mechanism comprises a rotating shaft rotatably arranged in the vibration cavity, a sleeve is rotatably connected to the rotating shaft, an oscillating plate and a trigger block are respectively arranged on the two sides of the sleeve, the outlet of the flow guide channel is arranged towards the front surface of the oscillating plate, and the fixed magnet is arranged on the back surface of the oscillating plate.

[0010] Preferably, the two ends of the sleeve are respectively provided with a mounting cylinder and an annular ratchet, a torsional spring is installed between the inner bottom wall of the mounting cylinder and the inner wall of the vibration cavity; a fixed ring is provided on the rotating shaft, a one-way push block is provided on the fixed ring, and the one-way push block is embedded in the tooth groove of the annular ratchet.

[0011] Preferably, the dehumidification mechanism comprises a gas delivery channel arranged on one side of the shell, the input end of the gas delivery channel is provided with a connecting cylinder, the connecting cylinder is detachably connected with the mouthpiece at the inlet, one end of the rotating shaft extends into the interior of the connecting cylinder, and a filter pad is detachably installed at the end portion, the filter pad is made of a breathable hydrophilic material.

[0012] Preferably, a communication port is formed in the shell, and the output end of the gas delivery channel is in fluid communication with the air inlet cavity through the communication port.

[0013] Preferably, the sliding plate mechanism comprises a first sliding rail arranged in the shell, an active plate is slidingly connected to the first sliding rail, the stress surface of the active plate corresponds to the air inlet cavity, and the second flow guide piece is fixedly connected with the active plate.

[0014] Preferably, an active rod is arranged on the active plate, the active rod is located below the trigger block, the other end of the active rod is provided with a roller, and a first spring is installed between the active rod and the inner wall of the shell.

[0015] Preferably, a second sliding rail is arranged in the vibration cavity, a sliding block is slidingly fitted on the second sliding rail, one side of the sliding block close to the roller is provided with a matching surface, and the matching surface is composed of an upper plane, a middle inclined surface and a lower plane.

[0016] Preferably, the other side of the sliding block is provided with a second spring, and the movable magnet is installed on the sliding block.

[0017] Preferably, the shell is provided with a transparent plate, the shell is composed of two split housings, and the inner wall of the vibration cavity is provided with an exhaust port away from the air inlet cavity.

[0018] The beneficial effects of the present application are:

[0019] 1. During use, when the exhalation flow decays, the oscillating plate can automatically reduce the swing amplitude, thereby increasing the vibration frequency, effectively compensating for the frequency drop caused by factors such as the decline in the user's lung function or the lack of power in the later stage of exhalation, widening the effective treatment time of the device, and prolonging the duration of the resonance effect, thereby ensuring the persistence and stability of the treatment effect within a single exhalation cycle.

[0020] 2. During use, the flow guide channel changes with the change in exhalation volume, that is, the internal pressure of the air inlet cavity changes accordingly, thereby ensuring that the pressure in the lungs and airways is always close to the set value, improving the treatment effect, and fundamentally avoiding the risk of damage to the patient's lungs caused by excessively high circuit pressure.

[0021] 3. When the device operates in the case of extremely low exhalation flow, the trigger block will continuously hit the movable rod, causing the size of the flow guide channel outlet to change periodically, resulting in periodic pressure accumulation and release in the air inlet cavity. Not only can it intermittently provide the oscillating plate with sufficient pulse air power, but also can produce intermittent positive pressure stimulation to the patient's lungs and airways. This change in internal pressure helps to further loosen sputum, thereby maintaining the basic treatment effect under extreme conditions.

[0022] 4. By setting the filter pad, the exhaled gas can be dehumidified, which fundamentally avoids the accumulation and atomization of condensate in the device, is conducive to the user's observation of the internal working state, and prevents cross-contamination caused by the risk of residual contaminated liquid leakage during disassembly and maintenance and cleaning. During operation of the present application, the filter pad rotates intermittently in one direction, effectively avoiding the premature saturation of the local area of the filter pad affecting the dehumidification effect, and further making the entire effective area of the filter pad be recycled and evenly utilized, thereby improving the overall utilization rate of the material. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Structure diagram of the present application Figure 1 .

[0024] Figure 2 Structure diagram of the present application Figure 2 .

[0025] Figure 3This is a cross-sectional view of the present invention. Figure 1 .

[0026] Figure 4 This is a cross-sectional view of the present invention. Figure 2 .

[0027] Figure 5 This is a cross-sectional view of the present invention. Figure 3 .

[0028] Figure 6 For the present invention Figure 4 A magnified structural diagram of part A in the middle.

[0029] Figure 7 This is a schematic diagram of the annular ratchet of the present invention.

[0030] In the attached diagram: 1. Outer shell; 2. Biting nozzle; 3. First guide vane; 4. Second guide vane; 5. Inlet chamber; 6. Vibration chamber; 7. Fixed magnet; 8. Movable magnet; 9. Guide channel; 10. Rotating shaft; 11. Sleeve; 12. Vibrating plate; 13. Trigger block; 14. Mounting cylinder; 15. Annular ratchet; 16. Torsion spring; 17. Fixed ring; 18. One-way push block; 19. Air delivery channel; 20. Connecting cylinder; 21. Filter pad; 22. Connecting port; 23. First slide rail; 24. Movable plate; 25. Movable rod; 26. Roller; 27. First spring; 28. Second slide rail; 29. ​​Slider; 30. Upper plane; 31. Middle inclined plane; 32. Lower plane; 33. Second spring; 34. Exhaust port; 35. Transparent plate. Detailed Implementation

[0031] The following will be for reference. Figures 1 to 7 The various embodiments of the present invention will be described in detail below. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] An airway clearance device based on fluid resonance adaptive adjustment of oscillation frequency, such as Figure 1 and Figure 2 As shown, the device includes a housing 1 and a mouthpiece 2. The housing 1 is equipped with a transparent plate 35. By setting the transparent plate 35 (equivalent to an observation window), the user can observe the internal operation of the device. The housing 1 is composed of two split housings, which are reliably connected and fixed by bolt pairs or quick-release buckle groups. This detachable housing 1 design improves the maintainability of the device and provides convenient conditions for later cleaning or maintenance operations.

[0033] like Figure 4 and Figure 5As shown, a dehumidification mechanism is provided on one side of the outer casing 1, and a flow guiding mechanism is installed inside the outer casing 1. The flow guiding mechanism divides the space inside the outer casing 1 into an air inlet chamber 5 and a vibration chamber 6. The input and output parts of the dehumidification mechanism are respectively connected to the nozzle 2 and the air inlet chamber 5 for fluid communication; Figure 4 , Figure 6 and Figure 7 As shown, a vibrating plate mechanism is installed inside the vibrating chamber 6. The vibrating plate mechanism is driven and connected to the moisture-absorbing part of the dehumidification mechanism. An exhaust port 34 is provided on the side of the inner wall of the vibrating chamber 6 away from the air inlet chamber 5. During operation, the user blows air into the outer shell 1 through the mouthpiece 2. This airflow drives the internal vibrating plate mechanism to work, converting the stable airflow into a vibration positive pressure wave with a specific frequency and amplitude. This wave acts on the user's respiratory tract, thereby reducing the adhesion of sputum and promoting its loosening from the airway wall. The loosened sputum stimulates the respiratory mucosa and triggers a cough reflex, thereby expelling the sputum. The airflow inside the outer shell 1 is finally discharged from the exhaust port 34.

[0034] A fixed magnet 7 is installed on the oscillating plate mechanism, and a movable magnet 8 is provided on the inner bottom wall of the vibration chamber 6. The fixed magnet 7 and the movable magnet 8 are magnetically repelled. The oscillating plate mechanism includes a rotating shaft 10 rotatably disposed in the vibration chamber 6. A sleeve 11 is rotatably connected to the rotating shaft 10. An oscillating plate 12 and a trigger block 13 are respectively disposed on both sides of the sleeve 11. The outlet of the flow channel 9 is disposed facing the front of the oscillating plate 12, and the fixed magnet 7 is disposed on the back of the oscillating plate 12. When the movable magnet 8 moves to the left, the corresponding area of ​​the fixed magnet 7 and the movable magnet 8 decreases, thereby reducing the magnetic repulsion force. Under the action of pneumatic force, the rotation (oscillation) amplitude of the oscillating plate 12 will increase, thereby reducing the vibration frequency.

[0035] like Figure 4 and Figure 7 As shown, the two ends of the sleeve 11 are respectively provided with a mounting cylinder 14 and an annular ratchet 15. A torsion spring 16 is installed between the inner bottom wall of the mounting cylinder 14 and the inner wall of the vibration chamber 6. The torsion spring 16 is used to provide the rotational reset force of the oscillating plate 12. A fixing ring 17 is provided on the rotating shaft 10. A one-way push block 18 is provided on the fixing ring 17. The one-way push block 18 is engaged with the tooth groove of the annular ratchet 15. During the swing of the oscillating plate 12, the sleeve 11 performs alternating forward and reverse rotation. Through the cooperation of the annular ratchet 15 and the one-way push block 18, the rotating shaft 10 is limited to intermittent step rotation in a single direction.

[0036] like Figure 1 and Figure 5As shown, the dehumidification mechanism includes an air supply channel 19 located on one side of the outer casing 1. The input end of the air supply channel 19 is provided with a connecting cylinder 20. The inlet of the connecting cylinder 20 is detachably connected to the mouthpiece 2. The mouthpiece 2 is assembled with the connecting cylinder 20 through an interface in the form of a snap-fit ​​or thread. This detachable connection mechanism ensures the interchangeability of the mouthpiece 2 as an independent consumable, which facilitates special cleaning or overall replacement to meet hygiene requirements. One end of the rotating shaft 10 extends into the interior of the connecting cylinder 20, and a filter pad 21 is detachably installed at the end. The filter pad 21 is made of a breathable hydrophilic material, such as a sponge. A connecting port 22 is provided on the outer casing 1, and the output end of the air supply channel 19 is fluidly connected to the air inlet chamber 5 through the connecting port 22.

[0037] It should be noted that during the operation of traditional devices, the high humidity of exhaled air can easily lead to the accumulation and atomization of a large amount of condensate inside the device. This not only seriously hinders the user's observation of the internal working status, but also poses a risk of leakage of residual liquid when the device needs to be disassembled for cleaning, resulting in cross-contamination.

[0038] In the air blowing process of this device, the gas is first dehumidified by the filter pad 21 to form a relatively dry airflow. This airflow is then guided in an orderly manner, passing through the air delivery channel 19 and the connecting port 22 in sequence, and finally entering the interior of the outer shell 1. This design effectively avoids the problems of liquid accumulation and visual obstruction from the source. It should be noted that during the operation of this device, the filter pad 21 rotates intermittently in one direction under the drive of the rotating shaft 10, which effectively avoids premature saturation in local areas, so that the entire effective area of ​​the filter pad 21 is used in a cyclical and balanced manner, preventing performance degradation caused by fixed flow channels or local impacts, thereby improving the overall utilization rate of the material.

[0039] like Figure 3 and Figure 4 As shown, the flow guiding mechanism includes a first flow guiding plate 3 and a second flow guiding plate 4. The first flow guiding plate 3 is fixed inside the outer shell 1. The first flow guiding plate 3 and the second flow guiding plate 4 are arranged opposite to each other and together form a flow guiding channel 9. The flow guiding channel 9 has a conical cross-section and its outlet is oriented towards the oscillating plate mechanism. The flow guiding channel 9 adopts a conical converging flow channel design, which can accelerate the airflow, increase its outlet velocity and dynamic pressure, and guide the concentrated airflow to the effective working area of ​​the oscillating plate 12. This not only ensures the efficient transfer of airflow energy, but also significantly improves the excitation efficiency and output amplitude of the oscillating plate 12. A sliding plate mechanism is installed inside the outer shell 1. The second flow guiding plate 4 and the movable magnet 8 are both driven and connected to the sliding plate mechanism.

[0040] The sliding plate mechanism includes a first slide rail 23 disposed within the housing 1, a movable plate 24 slidably connected to the first slide rail 23, the force-bearing surface of the movable plate 24 corresponding to the air intake chamber 5, and a second guide vane 4 fixedly connected to the movable plate 24. Figure 4As a reference, when the air pressure inside the intake chamber 5 increases, it pushes the movable plate 24 to move down, and the second guide vane 4 moves down to increase the outlet of the guide channel 9, so that the air pressure inside the intake chamber 5 decreases rapidly.

[0041] like Figure 4 and Figure 6 The movable plate 24 shown is equipped with a movable rod 25, which is located below the trigger block 13. The other end of the movable rod 25 is equipped with a roller 26. A first spring 27 is installed between the movable rod 25 and the inner wall of the outer casing 1. A second slide rail 28 is provided in the vibration chamber 6. A slider 29 is slidably fitted on the second slide rail 28. The side of the slider 29 near the roller 26 is a mating surface, which is composed of an upper plane 30, a middle inclined plane 31, and a lower plane 32. When the movable rod 25 moves down with the movable plate 24, the roller 26 rolls down along the upper plane 30. When the upper plane 30 moves to the middle inclined plane 31, it pushes the slider 29 to move to the left, which causes the movable magnet 8 to move to the left. The corresponding area of ​​the fixed magnet 7 and the movable magnet 8 decreases, thereby reducing the magnetic repulsion force. A second spring 33 is installed between the other side of the slider 29 and the inner wall of the vibration chamber 6. The movable magnet 8 is installed on the slider 29.

[0042] The working principle of this device is as follows: During operation, the user blows air through the mouthpiece 2. The air is first dehumidified by the filter pad 21 to form a relatively dry airflow. This airflow enters the air intake chamber 5 through the air delivery channel 19 and the connecting port 22. Then, it is guided by the flow guide channel 9 to the oscillating plate 12. The oscillating plate 12 oscillates and converts the stable airflow into a vibration positive pressure wave with a specific frequency and amplitude. This wave acts on the user's respiratory tract, thereby reducing the adhesion of sputum and promoting its loosening from the airway wall. The loosened sputum stimulates the respiratory mucosa and triggers a cough reflex, thereby expelling the sputum.

[0043] It should be noted that in the air blowing process, the gas first passes through the filter pad 21 for dehumidification to form a relatively dry airflow, and then enters the interior of the outer shell 1. This design effectively avoids the problems of liquid accumulation and visual obstruction from the source.

[0044] During the oscillation of the vibrating plate 12, the sleeve 11 rotates in both directions. Through the cooperation of the annular ratchet 15 and the one-way push block 18, the rotating shaft 10 rotates intermittently, that is, the filter pad 21 follows the rotating shaft 10 in one-way intermittent rotation, which effectively avoids premature saturation of local areas and makes the entire effective area of ​​the filter pad 21 circulate and be used evenly.

[0045] It is worth noting that when using traditional airway clearance devices, the expiratory flow rate of the user during a single expiratory cycle exhibits a "peak-decay" characteristic. In the early stages of exhalation, the high flow rate, if encountering a fixed small-diameter exhaust channel, can easily generate excessive "backflow pressure" inside, posing a potential risk of "barotrauma." In the later stages of exhalation, the natural decay of the flow rate leads to insufficient driving energy, causing the oscillation frequency generated by the device to decrease, and the therapeutic effect to weaken accordingly.

[0046] When the peak expiratory flow rate is input, the internal pressure of the intake chamber 5 increases, driving the movable plate 24 to overcome resistance and move downward. The second guide plate 4 moves downward, increasing the flow area at the outlet of the guide channel 9, which allows the internal pressure of the intake chamber 5 to be released quickly, fundamentally avoiding the risk of lung damage caused by excessive circuit pressure.

[0047] When this device is in operation, if the air pressure in the air intake chamber 5 is sufficient to overcome the preload of the first spring 27 (ensuring that the lung and airway pressures reach the set values ​​to improve the treatment effect), the movable rod 25 moves down with the movable plate 24 to the lower plane 32 corresponding to the roller 26, which is considered the normal working mode; when the expiratory flow decreases, the pressure inside the air intake chamber 5 drops, the first spring 27 pushes against the movable rod 25 and rises, the flow area of ​​the guide channel 9 at the outlet decreases, so that the air intake chamber 5 stores pressure and maintains it at the set pressure; during the upward movement of the movable rod 25, when the roller 26 moves to the middle When the inclined plane is at 31, the movable rod 25 continues to rise, and the second spring 33 will push the slider 29 to the right, that is, the movable magnet 8 moves to the right. The corresponding area of ​​the fixed magnet 7 and the movable magnet 8 is increased, which increases the magnetic repulsion force. The oscillation amplitude of the oscillating plate 12 under the action of air force is reduced, thereby increasing the vibration frequency. This effectively compensates for the frequency drop caused by the user's decreased lung function or insufficient power in the later stage of exhalation, widens the effective treatment time window of the device, prolongs the duration of the resonance effect, and thus ensures the continuity and stability of the treatment effect within a single exhalation cycle.

[0048] It is worth noting that in cases of extremely low expiratory flow (e.g., when the patient's airway is narrowed due to sputum blockage or bronchospasm, making it difficult to maintain a sufficiently strong airflow for a long time), the movable rod 25 will rise to contact the trigger block 13. During the swing of the oscillating plate 12, the trigger block 13 continuously pushes against the movable rod 25, causing the size of the outlet of the guide channel 9 to change continuously. This results in the periodic accumulation and decompression of the air inlet chamber 5, which not only provides the oscillating plate 12 with enough pulse force to start the swing, but also generates intermittent positive pressure stimulation on the patient's lungs and trachea. This change in internal pressure helps to further loosen the sputum and may enhance the patient's desire to cough, thus maintaining the basic treatment effect even under extreme conditions.

[0049] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A fluidic resonator based airway clearance device for self-adaptively adjusting the oscillation frequency, comprising a housing (1) and a mouthpiece (2), characterized in that, One side of the shell (1) is provided with a dehumidification mechanism, a flow guide mechanism is installed in the shell (1), the flow guide mechanism divides the space in the shell (1) into an air inlet cavity (5) and a vibration cavity (6), the input and output parts of the dehumidification mechanism are respectively in fluid communication with a mouthpiece (2) and the air inlet cavity (5); an oscillating plate mechanism is installed in the vibration cavity (6), the oscillating plate mechanism is drivingly connected with a moisture absorption part of the dehumidification mechanism; a fixed magnet (7) is installed on the oscillating plate mechanism, a movable magnet (8) is arranged on the inner bottom wall of the vibration cavity (6), the fixed magnet (7) and the movable magnet (8) are magnetically repulsive; The flow guide mechanism comprises a first flow guide fin (3) and a second flow guide fin (4), the first flow guide fin (3) is fixed in the shell (1), the first flow guide fin (3) is oppositely arranged with the second flow guide fin (4) and the two constitute a flow guide channel (9), the flow guide channel (9) is tapered in cross section, and the outlet is arranged towards the oscillating plate mechanism; a sliding plate mechanism is installed in the shell (1), the second flow guide fin (4) and the movable magnet (8) are drivingly connected with the sliding plate mechanism.

2. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 1, wherein, The oscillating plate mechanism comprises a rotating shaft (10) rotatably arranged in the vibration cavity (6), a sleeve (11) is rotatably connected to the rotating shaft (10), the two sides of the sleeve (11) are respectively provided with an oscillating plate (12) and a trigger block (13), the outlet of the flow guide channel (9) is arranged towards the front surface of the oscillating plate (12), and the fixed magnet (7) is arranged on the back surface of the oscillating plate (12).

3. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 2, wherein, The two ends of the sleeve (11) are respectively provided with a mounting cylinder (14) and an annular ratchet wheel (15), a torsional spring (16) is installed between the inner bottom wall of the mounting cylinder (14) and the inner wall of the vibration cavity (6); the rotating shaft (10) is provided with a fixed ring (17), the fixed ring (17) is provided with a one-way push block (18), and the one-way push block (18) is embedded in the tooth groove of the annular ratchet wheel (15).

4. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 2, wherein, The dehumidification mechanism comprises a gas conveying channel (19) arranged on one side of the shell (1), the input end of the gas conveying channel (19) is provided with a connecting cylinder (20), the connecting cylinder (20) is detachably connected with the mouthpiece (2) at the inlet, one end of the rotating shaft (10) extends into the interior of the connecting cylinder (20), and a filter pad (21) is detachably installed at the end, the filter pad (21) is made of a breathable and hydrophilic material.

5. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 4, wherein, A communication port (22) is formed in the shell (1), and the output end of the gas conveying channel (19) is in fluid communication with the air inlet cavity (5) through the communication port (22).

6. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 1, wherein, The sliding plate mechanism comprises a first sliding rail (23) arranged in the shell (1), the first sliding rail (23) is slidingly connected with a movable plate (24), the stress surface of the movable plate (24) corresponds to the air inlet cavity (5), and the second flow guide fin (4) is fixedly connected with the movable plate (24).

7. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 2, wherein, The movable plate (24) is provided with a movable rod (25), the movable rod (25) is located below the trigger block (13), the other end of the movable rod (25) is provided with a roller (26), and the first spring (27) is installed between the movable rod (25) and the inner wall of the shell (1).

8. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 7, wherein, The vibration cavity (6) is internally provided with a second sliding rail (28), and a sliding block (29) is in sliding fit with the second sliding rail (28); the side of the sliding block (29) close to the roller (26) is provided as a fit surface, and the fit surface is composed of an upper plane (30), a middle inclined surface (31) and a lower plane (32).

9. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 8, wherein, A second spring (33) is mounted between the other side of the sliding block (29) and the inner wall of the vibration cavity (6), and the movable magnet (8) is mounted on the sliding block (29).

10. A fluidic-resonator based airway clearance device that self-adapts the oscillation frequency according to claim 1, wherein, The shell (1) is provided with a transparent plate (35), the shell (1) is composed of two split housings, and the inner wall of the vibration cavity (6) is provided with an exhaust port (34) away from the air inlet cavity (5).

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