Ventilation therapy apparatus and gas circuit side cover assembly therefor

Abstract

The utility model relates to ventilation therapy equipment field discloses a ventilation therapy equipment and for its air path side cover subassembly (100), the air path side cover subassembly (100) has ventilation chamber (4) and respectively communicate to the air inlet (11a) and the air outlet (12a) of ventilation chamber (4), the air path side cover subassembly is used to define ventilation chamber (4) at least partial inner wall surface and is formed with multiple towards ventilation chamber (4) opening's sound attenuation cavity (31). When the sound wave flows through the opening of these sound attenuation cavities, the pressure in the sound attenuation cavity changes periodically, forming a reciprocating air column at the opening, thereby increasing the air friction in the cavity, converting the sound wave kinetic energy into heat energy, achieving noise reduction, and can avoid producing tiny harmful particles after long time use, improving the use safety.

Description

Technical Field

[0001] This utility model relates to ventilation therapy equipment, specifically to an airway side cover assembly for a ventilation therapy equipment. Furthermore, this utility model also relates to a ventilation therapy equipment including the airway side cover assembly. Background Technology

[0002] For example, ventilators are widely used in modern medicine for scenarios such as anesthesia respiratory management, respiratory support therapy, and emergency resuscitation. With the continuous development of medical technology, ventilators play an important role in improving diseases such as obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD).

[0003] However, existing ventilators generally suffer from excessive noise during use, affecting patients' sleep quality. This noise primarily originates from the fan, which transmits noise through the breathing tubing to the patient, severely impacting their rest. To address this issue, existing ventilators employ various noise reduction measures, such as designing bends or variable cross-sections at the fan's air inlet, and installing sound-absorbing cotton or silencers on the fan. These methods effectively reduce the outward propagation of fan noise, but some limitations remain. For example, sound-absorbing cotton is prone to aging, producing fine particles that can be carried into the patient's lungs by the airflow, harming their health; and the design of the fan's air inlet pathway cannot effectively prevent fan noise from propagating along the breathing tubing to the patient.

[0004] Typically, the airflow delivered by the fan needs to be humidified in a humidifier tank before being delivered to the patient through the breathing tubing to ensure comfort. In some cases, the humidifier tank can be omitted and replaced with a waterless gas path side cover, forming part of the gas passage between the fan outlet and the ventilator's breathing tubing interface. Because the airflow is delivered directly to the breathing tubing without humidification, the fan noise will be more noticeable when using this waterless gas path side cover. Utility Model Content

[0005] The purpose of this invention is to overcome the problem of excessive fan noise in existing ventilation therapy equipment when using a waterless airway side cover. This invention provides an airway side cover assembly for ventilation therapy equipment. This airway side cover assembly can effectively reduce the transmission of fan noise through the breathing tube interface and can prevent the generation of fine particles that are harmful to the patient's health due to the aging of the sound-absorbing cotton after long-term use.

[0006] To achieve the above objectives, the present invention provides an airway side cover assembly for a ventilation therapy device. The airway side cover assembly has a ventilation chamber and an air inlet and an air outlet respectively connected to the ventilation chamber. At least a portion of the inner wall surface of the airway side cover assembly for defining the ventilation chamber has a plurality of sound-absorbing cavities that open toward the ventilation chamber.

[0007] Preferably, the air inlet and air outlet are located on the same side of the ventilation chamber, and a plurality of the silencing cavities are formed on a side of the ventilation chamber different from the air inlet and air outlet.

[0008] Preferably, the ventilation chamber is provided with a flexible diaphragm covering the opening end of each of the anechoic chambers, and the flexible diaphragm has ventilation holes that communicate with each of the anechoic chambers respectively.

[0009] Preferably, the air passage side cover assembly includes an air passage body defining the ventilation chamber and a side cover shell, wherein an air passage sealing ring is provided at the position where the air passage body and the side cover shell are connected to each other, wherein the silencing cavity is formed on the side cover shell, and the flexible diaphragm is integrally formed with the air passage sealing ring or the flexible diaphragm is connected to the air passage sealing ring and installed with the air passage sealing ring to fit against the side cover shell to cover the opening end of each of the silencing cavities.

[0010] More preferably, the air passage body is formed with an air inlet inner tube having the air inlet and an air outlet inner tube having the air outlet, the air inlet inner tube and the air outlet inner tube extending into the ventilation chamber in a direction toward the side cover shell.

[0011] More preferably, the air intake inner tube is provided with a guide rib, which is configured to divide the inner cavity of the air intake inner tube into multiple air intake guide channels.

[0012] More preferably, the airway body has a press-to-unlock cantilever, on which a limiting buckle for engaging with the main unit of the ventilation therapy device is formed, and a flexible support block elastically supported on the press-to-unlock cantilever is formed on the airway sealing ring.

[0013] More preferably, a mounting groove is formed on the side of the side cover housing facing the gas passage body, and the gas passage sealing ring is at least partially located in the mounting groove and covers the edge of the gas passage body facing the side cover housing, so that the gas passage body and the side cover housing are sealed together.

[0014] More preferably, the plurality of the silencing cavities are arranged in a honeycomb pattern or distributed in an array on the side cover shell.

[0015] A second aspect of this invention provides a ventilation therapy device, including a device main unit and the aforementioned airway side cover assembly detachably connected to the device main unit.

[0016] Through the above technical solution, the air passage side cover assembly of this utility model can connect the fan outlet end and the breathing pipeline interface of the main unit of the equipment through its air inlet and air outlet, respectively, thus forming part of the gas passage between the fan outlet end and the breathing pipeline interface of the ventilator. The ventilation chamber can be configured as an expansion chamber connecting the air inlet and air outlet, thus forming an expansion chamber silencer structure. This reduces the flow velocity of the airflow when it is delivered to the ventilation chamber through the air inlet, allowing the pressure wave to diffuse and reducing noise propagation. Furthermore, by forming multiple silencing cavities on at least a portion of the inner wall surface defining the ventilation chamber, these silencing cavities form tiny Helmholtz resonators. When sound waves flow through the openings of these silencing cavities, the pressure inside the silencing cavities changes periodically, forming a reciprocating air column at the opening. This increases the air friction inside the cavity, converting sound wave energy into heat energy, thereby achieving noise reduction. This silencing method can reduce or avoid the use of sound-absorbing cotton, thus preventing the generation of fine harmful particles after prolonged use and improving safety. Attached Figure Description

[0017] Figure 1 This is a perspective view of a ventilation therapy device according to a preferred embodiment of the present invention, wherein some components have been removed; Figure 2 It is observed from another perspective. Figure 1 A three-dimensional view of the ventilation therapy device, in which the upper casing of the main unit of the device has been further removed; Figure 3 This is a perspective view of an airway side cover assembly for a ventilation therapy device according to a preferred embodiment of the present invention. Figure 4 It is observed from another perspective. Figure 3 3D view of the gas path side cover assembly; Figure 5 yes Figure 3 Exploded view of the gas path side cover assembly; Figure 6 It is observed from another perspective. Figure 3 Exploded view of the gas path side cover assembly; Figure 7 yes Figure 3 A three-dimensional view of the main air passage of the gas passage side cover assembly; Figure 8 yes Figure 3 A perspective view of the side cover housing of the central gas path side cover assembly; Figure 9 yes Figure 3A three-dimensional view of the integrally molded parts of the gas passage sealing ring and flexible diaphragm of the gas passage side cover assembly; Figure 10 yes Figure 3 Cross-sectional view of the gas path side cover assembly; Figure 11 It is observed from another perspective. Figure 3 Cross-sectional view of the gas path side cover assembly; Figure 12 After being cut from another cross section Figure 3 Cross-sectional view of the gas path side cover assembly.

[0018] Explanation of reference numerals in the attached figures 100 - Gas path side cover assembly; 200 - Main unit of equipment; 1-Air circuit main body; 11-Intake inner tube; 11a-Intake port; 11b-Guide rib; 12-Outtake inner tube; 12a-Outtake port; 13-Press unlocking cantilever; 14-Limit buckle; 15-Connecting protrusion; 21-Gas passage sealing ring; 22-Flexible diaphragm; 22a-Vent hole; 23-Flexible support block; 3-Side cover housing; 31-Silence silencing cavity; 32-Mounting groove; 33-Connecting piece; 4-Ventilation chamber. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0020] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "left," and "right" generally refer to the upper, lower, left, and right as shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself.

[0021] As mentioned above, to reduce the stimulation of the cardiopulmonary system by mechanical ventilation and improve patient adaptability, ventilation therapy equipment such as ventilators are usually equipped with a humidification tank (humidifier). The airflow delivered by the fan is humidified in the humidification tank and then delivered to the patient through the breathing tubing. In some cases, the humidification tank can be omitted and replaced with a waterless gas passage side cover, forming part of the gas passage between the fan outlet and the ventilator's breathing tubing interface. For example... Figure 1 and Figure 2As shown, the main unit 200 of the ventilation therapy device can generate pressurized airflow for the patient to inhale via a built-in fan (not shown), and deliver it to a patient interface such as a breathing mask through a breathing tubing connected to its breathing tubing interface. The main unit 200 can be selectively connected to either a humidification tank or an airway side cover assembly 100. When configured with the airway side cover assembly 100 installed, the airflow generated by the fan can be delivered directly to the breathing tubing without humidification. To more clearly illustrate the airway side cover assembly 100 and its assembly and connection with the main unit 200, Figure 2 The internal components and upper housing of the main unit 200 are omitted. The airway side cover assembly 100 has an air inlet 11a and an air outlet 12a that open towards the main unit 200. The air inlet 11a can be connected to the fan outlet to receive the airflow generated by the fan; the air outlet 12a can be connected to the breathing tubing interface to output airflow for the patient to inhale into the breathing tubing. Thus, the airway side cover assembly 100 constitutes part of the gas passage between the fan outlet and the breathing tubing interface of the ventilator. To ensure high gas delivery efficiency, the airway side cover assembly 100 may also be provided with sealing rings surrounding the air inlet 11a and the air outlet 12a respectively to form a sealed connection with the main unit 200.

[0022] One aspect of this utility model provides an airway side cover assembly 100 for the ventilation therapy device, combined with... Figures 3 to 6 , Figures 10 to 12 As shown, the air passage side cover assembly 100 has a ventilation chamber 4, with an air inlet 11a and an air outlet 12a respectively connected to the ventilation chamber 4. At least a portion of the inner wall surface of the air passage side cover assembly 100 defining the ventilation chamber 4 has a plurality of silencing cavities 31 opening toward the ventilation chamber 4. For example, as detailed below in conjunction with a preferred embodiment, honeycomb-arranged silencing cavities 31 can be formed on the inner surface of the side cover housing 3 of the air passage side cover assembly 100, opening toward the ventilation chamber 4 through corresponding vent holes 22a formed thereon. A flexible diaphragm 22 covers the inner surface of the side cover housing 3.

[0023] Therefore, on the one hand, the ventilation chamber 4 can be configured as an expansion chamber connecting the air inlet 11a and the air outlet 12a, thus forming an expansion chamber silencer structure. This reduces the flow velocity of the airflow as it passes through the air inlet 11a into the ventilation chamber 4, allowing the pressure wave to diffuse and reducing noise propagation. On the other hand, by forming multiple silencing cavities 31 on at least a portion of the inner wall surface defining the ventilation chamber 4, these silencing cavities 31 form tiny Helmholtz resonators. When sound waves flow through the openings of these silencing cavities 31, the pressure within the silencing cavities 31 undergoes periodic changes, forming a reciprocating air column at the opening. This increases air friction within the cavity, converting sound wave energy into heat energy, thereby reducing noise. This silencing method can reduce or eliminate the use of sound-absorbing cotton, thus preventing the generation of fine harmful particles after prolonged use and improving safety.

[0024] Furthermore, the air inlet 11a and the air outlet 12a can be located on the same side of the ventilation chamber 4, and multiple silencing cavities 31 are formed on the other side of the ventilation chamber 4 opposite to the air inlet 11a and the air outlet 12a. Thus, the airflow and sound waves carried by the airflow delivered into the ventilation chamber 4 through the air inlet 11a can generally enter the silencing cavity 31 in a positive direction, thereby enabling the noise reduction structure based on the Helmholtz resonance silencing principle to have high silencing efficiency. In other embodiments, the silencing cavity 31 can be formed on other inner wall surfaces of the ventilation chamber 4 that are not opposite to the air inlet 11a and the air outlet 12a, such as the bottom wall of the ventilation chamber 4 or the side wall of the air passage body 1 described later.

[0025] To achieve good noise reduction and silencing effects, the opening end of the silencing cavity 31 should be designed as a constricted opening, meaning the opening connecting the silencing cavity 31 to the ventilation chamber 4 should have a relatively small flow cross-sectional area compared to other parts. In a preferred embodiment of the air path side cover assembly 100 of this utility model, a constricted structure can be formed by covering the opening end of the silencing cavity 31 with a flexible diaphragm 22 having vent holes 22a, thereby avoiding a significant increase in manufacturing difficulty caused by setting the silencing cavity 31. Specifically, the flexible diaphragm 22 can be installed in the ventilation chamber 4 and cover the opening end of each silencing cavity 31, wherein the flexible diaphragm 22 has vent holes 22a respectively communicating with each silencing cavity 31, such as... Figure 10 and Figure 12 As shown. With this configuration, when sound waves pass through the vent 22a on the flexible diaphragm 22 and enter the anechoic chamber 31, the flexible diaphragm 22 can vibrate, thereby significantly attenuating the sound wave energy through its vibration damping. As will be described later, the flexible diaphragm 22 can be made of silicone and can be integrally formed with the air passage sealing ring 21.

[0026] The depth of the anechoic cavity 31 and the thickness of the flexible diaphragm 22 need to be appropriately set to meet the noise elimination requirements of the corresponding frequencies and avoid a significant increase in equipment costs. Specifically, the deeper the anechoic cavity 31, the lower the natural frequency of the air inside, and the lower the corresponding noise reduction frequency, and vice versa. Furthermore, within a certain depth range, increasing the depth of the anechoic cavity 31 is beneficial for improving the noise reduction at the target frequency, but excessive depth will significantly increase manufacturing difficulty. Typically, the depth of the anechoic cavity 31 can be set to 5mm-20mm. For the flexible diaphragm 22, the greater its thickness, the lower the corresponding primary noise reduction frequency, while a thinner thickness can eliminate higher frequency noise. The thickness of the flexible diaphragm 22 should be appropriately set; too small a thickness will result in insufficient rigidity, leading to a reduction in high-frequency noise reduction; too large a thickness will lead to increased transmission of mid- and low-frequency sound waves, resulting in a poorer noise reduction effect.

[0027] Combination Figures 3 to 12 As shown, a preferred embodiment of the air passage side cover assembly 100 according to this utility model includes an air passage body 1, a side cover shell 3, and an air passage sealing ring 21. The air passage sealing ring 21 is disposed at the position where the air passage body 1 and the side cover shell 3 are connected to each other, and seals the ventilation chamber 4 formed by the air passage body 1 and the side cover shell 3. In this case, the air inlet 11a and the air outlet 12a can be provided on the air passage body 1, the silencing cavity 31 can be formed on the side cover shell 3, and the flexible diaphragm 22 is integrally formed with the air passage sealing ring 21 and is installed with the air passage sealing ring 21 to fit against the side cover shell 3 to cover the opening end of each silencing cavity 31. Thus, the various parts of the air passage side cover assembly 100 can be manufactured and assembled relatively easily, especially the multiple silencing cavities 31 arranged in a honeycomb pattern as a noise reduction structure formed on the side cover shell 3. Furthermore, by assembling the various parts into one unit, the flexible diaphragm 22 can be well covered at the opening end of each anechoic cavity 31. In other embodiments, the air passage sealing ring 21 and the flexible diaphragm 22 can also be formed independently and connected together. Similarly, the flexible diaphragm 22 can be covered at the opening end of each anechoic cavity 31 by installing the air passage sealing ring 21 to fit against the side cover shell 3.

[0028] Figure 7The inner structure of the airway body 1 is shown. This airway body 1 has an inlet tube 11 and an outlet tube 12 extending into the ventilation chamber 4 along the direction toward the side cover shell 3, respectively. An inlet port 11a is formed at the outer end of the inlet tube 11, and an outlet port 12a is formed at the outer end of the outlet tube 12. The extension lengths of the inlet tube 11 and the outlet tube 12 should be appropriately set to accommodate the elimination of noise at corresponding silencing frequencies: the longer their extension into the ventilation chamber 4, the lower the silencing frequency. The inlet tube 11 and the outlet tube 12 facilitate the elimination of mid-to-low frequency noise. The expansion chamber silencer structure formed by them and the ventilation chamber effectively hinders the propagation of mid-to-low frequency noise. Combined with the silencing cavity 31 covered by a relatively thin flexible diaphragm 22, which eliminates high-frequency noise, the propagation of fan noise along the breathing tubing to the patient end can be significantly reduced. The extension directions of the intake inner tube 11 and the exhaust inner tube 12 can be parallel to the opening direction of the silencing cavity 31 to ensure good noise reduction effect. (See subsequent references.) Figure 1 and Figure 2 The gas path side cover assembly 100 can be connected to the device host 200 via a plug-in method, such that the air inlet 11a formed in the air inlet inner tube 11 and the air outlet 12a formed in the air outlet inner tube 12 are respectively connected to the corresponding ventilation pipes of the device host 200. For this purpose, the air inlet 11a and the air outlet 12a need to be aligned with the interfaces of the ventilation pipes. However, in order to ensure that the side cover shell 3 is flush with the outer surface of the device host 200, the placement position (especially the height position) of the air inlet inner tube 11 and the air outlet inner tube 12 may be constrained, causing the peripheral walls of the air inlet inner tube 11 and / or the air outlet inner tube 12 to interfere with the outer peripheral wall of the gas path body 1. In this case, the air inlet inner tube 11 and / or the air outlet inner tube 12 can be formed as an incomplete cylindrical tube and fit against the inner wall of the ventilation chamber 4 or have the gas passage defined by the inner wall of the ventilation chamber 4. Where space permits, the intake manifold 11 and the exhaust manifold 12 can define gas passages with circular cross-sections to ensure smooth gas flow and reduce noise generation.

[0029] Combination Figure 12 As shown, the inner intake pipe 11 may be provided with guide ribs 11b, which are configured to divide the inner cavity of the inner intake pipe 11 into multiple intake guide channels. These multiple intake guide channels can sort and shape the turbulent airflow output by the fan, which can not only prevent the high-speed turbulent airflow from generating regenerated noise when flowing through the inner intake pipe 11, but also allow the sound waves to flow in the positive direction to the silencing cavity 31 as much as possible, so as to better exert its noise reduction effect.

[0030] The main air passage 1 can be connected to the side cover housing 3 in an appropriate manner. For example... Figure 6 and Figure 12In a preferred embodiment, a plurality of connecting protrusions 15 may be formed on the outer peripheral surface of the gas passage body 1, and the side cover shell 3 may be formed with a connecting piece 33 that engages with the connecting protrusions 15. The connecting piece 33 has a snap-fit ​​groove for engaging with the connecting protrusions 15. Thus, when the side cover shell 3 is installed on the gas passage body 1, it can prevent the side cover shell 3 from detaching in a direction away from the gas passage body 1, forming a stable connection.

[0031] Figure 8 The inner structure of the side cover housing 3 is shown. A mounting groove 32 is formed on the side of the side cover housing 3 facing the air passage body 1. (Combined) Figures 10 to 12 As shown, the gas passage sealing ring 21 is at least partially located within the mounting groove 32 and covers the edge of the gas passage body 1 facing the side cover housing 3, so that the gas passage body 1 and the side cover housing 3 are sealed together. This arrangement facilitates easy assembly of the side cover housing 3 to the gas passage body 1 and creates a good sealing effect at the connection points.

[0032] In addition, a plurality of uniformly distributed sound-absorbing cavities 31 are formed in the space surrounded by the aforementioned mounting groove 32 of the side cover shell 3. These sound-absorbing cavities 31 can be arranged in a honeycomb pattern or in an array, and each has a hexagonal, pentagonal, quadrilateral or circular outline shape.

[0033] Figure 9 The diagram shows an integrally molded component including an air passage sealing ring 21 and a flexible diaphragm 22, with the air passage sealing ring 21 surrounding the flexible diaphragm 22. The flexible diaphragm 22 can be a sheet-like structure located in the middle portion of the air passage sealing ring 21. Therefore, although different names are used here for clarity of description, the air passage sealing ring 21, the flexible diaphragm 22, and the subsequently described flexible support block 23 can all be integrally molded silicone components; that is, the flexible diaphragm 22 is a silicone membrane surrounded by the air passage sealing ring 21. This silicone membrane has uniformly distributed vent holes 22a, which correspond one-to-one with the various sound-absorbing cavities 31 on the side cover housing 3, thereby forming tiny Helmholtz resonators.

[0034] like Figure 1 and Figure 2As shown, the gas path side cover assembly 100 can be connected to the main unit 200 via an insert method and locked in the insert position by a limiting buckle 14. Typically, the limiting buckle 14 can be formed on a press-to-unlock cantilever 13, one end of which is connected to the outer wall of the gas path body 1, forming a cantilever-type unlocking structure, which has the advantages of simple structure and convenient use. When the gas path side cover assembly 100 is inserted into the main unit 200, the press-to-unlock cantilever 13 springs upward, so that the limiting buckle 14 on it is locked with the corresponding mating structure on the main unit 200, preventing the gas path side cover assembly 100 from detaching from the main unit 200; when it is necessary to remove the gas path side cover assembly 100 from the main unit 200, the operator presses the press-to-unlock cantilever 13, thereby separating the limiting buckle 14 from the corresponding mating structure on the main unit 200, so that the gas path side cover assembly 100 can be pulled out in a direction away from the main unit 200.

[0035] like Figure 9 and Figure 11 As shown, in a preferred embodiment, a flexible support block 23 can be formed on the gas passage sealing ring 21, which elastically supports the press-to-unlock cantilever 13. This flexible support block 23 provides a limiting effect along the pressing direction by supporting the press-to-unlock cantilever 13, preventing accidental separation of the gas passage side cover assembly 100 from the device host 200, and also preventing the press-to-unlock cantilever 13 from being broken or damaged due to excessive pressing. When pressure is applied to the press-to-unlock cantilever 13 toward the flexible support block 23, the flexible support block 23 undergoes elastic deformation, allowing the limiting buckle 14 on the press-to-unlock cantilever 13 to separate from the corresponding mating structure on the device host 200.

[0036] Another aspect of this utility model provides a ventilation therapy device, such as a ventilator, which includes a device main unit 200 and the aforementioned airway side cover assembly 100 detachably connected to the device main unit 200, so as to effectively reduce the transmission of fan noise through the breathing tubing interface in the absence of water supply, and to prevent the generation of fine particles that are harmful to the patient's health due to the aging of the sound-absorbing cotton after long-term use.

[0037] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An airway side cover assembly for a ventilation therapy device, characterized in that, The air passage side cover assembly has a ventilation chamber (4) and an air inlet (11a) and an air outlet (12a) respectively connected to the ventilation chamber (4). At least a portion of the inner wall surface of the air passage side cover assembly for defining the ventilation chamber (4) has a plurality of silencing cavities (31) opening toward the ventilation chamber (4).

2. The airway side cover assembly for a ventilation therapy device according to claim 1, characterized in that, The air inlet (11a) and air outlet (12a) are located on the same side of the ventilation chamber (4), and a plurality of the silencing cavities (31) are formed on a side of the ventilation chamber (4) different from the air inlet (11a) and air outlet (12a).

3. The airway side cover assembly for a ventilation therapy device according to claim 1, characterized in that, The ventilation chamber (4) is provided with a flexible diaphragm (22) covering the opening end of each of the silencing chambers (31), and the flexible diaphragm (22) has ventilation holes (22a) that are respectively connected to each of the silencing chambers (31).

4. The airway side cover assembly for a ventilation therapy device according to claim 3, characterized in that, The air passage side cover assembly includes an air passage body (1) defining the ventilation chamber (4) and a side cover shell (3). An air passage sealing ring (21) is provided at the position where the air passage body (1) and the side cover shell (3) are connected to each other. The silencing cavity (31) is formed on the side cover shell (3). The flexible diaphragm (22) is integrally formed with the air passage sealing ring (21) or the flexible diaphragm (22) is connected to the air passage sealing ring (21) and installed with the air passage sealing ring (21) to fit against the side cover shell (3) to cover the opening end of each of the silencing cavities (31).

5. The airway side cover assembly for a ventilation therapy device according to claim 4, characterized in that, The main body of the air passage (1) is formed with an air inlet tube (11) having the air inlet (11a) and an air outlet tube (12) having the air outlet (12a). The air inlet tube (11) and the air outlet tube (12) extend into the ventilation chamber (4) in the direction toward the side cover shell (3).

6. The airway side cover assembly for a ventilation therapy device according to claim 5, characterized in that, The air intake inner tube (11) is provided with a guide rib (11b), which is configured to divide the inner cavity of the air intake inner tube (11) into multiple air intake guide channels.

7. The airway side cover assembly for a ventilation therapy device according to claim 4, characterized in that, The airway body (1) has a press-to-unlock cantilever (13), on which a limiting buckle (14) for engaging with the device host (200) of the ventilation therapy device is formed, and a flexible support block (23) elastically supported on the press-to-unlock cantilever (13) is formed on the airway sealing ring (21).

8. The airway side cover assembly for a ventilation therapy device according to claim 4, characterized in that, The side cover shell (3) has a mounting groove (32) on the side facing the air passage body (1). The air passage sealing ring (21) is located at least partially in the mounting groove (32) and covers the edge of the air passage body (1) facing the side cover shell (3) so that the air passage body (1) and the side cover shell (3) are sealed to each other.

9. The airway side cover assembly for a ventilation therapy device according to claim 4, characterized in that, The multiple silencing cavities (31) are arranged in a honeycomb pattern or in an array on the side cover shell (3).

10. A ventilation therapy device, characterized in that, Includes a device host (200) and an air passage side cover assembly (100) detachably connected to the device host (200) according to any one of claims 1 to 9.

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