Noise reduction air channel applied to PAP device

Abstract

A noise reduction airway within a PAP device for use in generating continuous positive pressure gas to ameliorate respiratory diseases, the noise reduction airway consisting of a plurality of parts, comprising a housing having at least one gas outlet, at least one gas inlet, an inner wall and an outer wall, where the housing consists of at least two parts. When the noise reduction air channel works, all parts of the shell are sealed, so that an air channel providing an air flowing space is formed in the inner wall of the shell. The inner wall forms at least one cavity in the gas channel, and the air blower is located in the cavity and configured to pressurize gas entering the cavity and then convey the gas to the gas outlet of the shell. A ventilation component, an air inlet pipe and an outlet pipe can be further arranged in the gas channel.

Description

Technical Field

[0001] The utility model relates to a noise reduction air duct used inside a PAP device, and relates to a gas passage composed of a housing and an internal noise reduction component, as well as the placement of a blower. Background Art

[0002] Sleep time accounts for about one-third of a person's life. During sleep, a type of disease related to abnormal respiratory function is extremely likely to occur. These diseases can affect people's breathing patterns, leading to apnea, dyspnea or other breathing problems, and disturbing normal sleep to a certain extent. Common sleep apnea-related diseases include snoring, sleep apnea syndrome (SAS), hypopnea, hypoventilation, sleep-related hypoxemia and other rare types. Moreover, the same patient may suffer from more than one sleep apnea-related disease. For example, more than 90% of patients with obesity hypoventilation syndrome also suffer from obstructive sleep apnea (OSA); and patients with chronic obstructive pulmonary disease (COPD) may also experience hypoxemia during sleep. The incidence of complications in patients with multiple sleep apnea-related diseases is higher, and the symptoms are more severe. Therefore, attention should be paid to sleep apnea-related diseases. Early identification and treatment of patients with a tendency is crucial for improving the sleep quality of patients, reducing the risk of complications and improving the quality of life.

[0003] Sleep apnea syndrome is one of the most common sleep and breathing diseases. It includes obstructive sleep apnea syndrome and central sleep apnea syndrome. Obstructive sleep apnea syndrome usually refers to the partial or complete blockage of the respiratory tract during sleep, resulting in apnea or shallow breathing. Central sleep apnea syndrome is caused by the brain's inability to send sufficient signals to control the respiratory muscles, resulting in apnea. For these two types of sleep apnea syndrome, the treatment methods are different. The most common treatment for patients with obstructive sleep apnea syndrome is to use a home ventilator for treatment, change lifestyle or perform surgical treatments such as oral correction; while for central sleep apnea syndrome, treatment needs to be targeted at potential abnormalities in the central nervous system. Obstructive sleep apnea is more common than central sleep apnea, and its prevalence is generally high in the population, especially in adults.

[0004] When using a home ventilator to treat patients with obstructive sleep apnea, the principle is to provide continuous positive pressure airflow through the ventilator to keep the patient's upper airway open. The core of ventilator treatment is to use a blower to generate a pressurized air flow, and send the pressurized air flow into the patient's nose or mouth through a pipe connected to the ventilator, so that the patient's airway is in a positive pressure state to prevent the airway from collapsing or closing during sleep, thereby avoiding apnea and airway obstruction. Compared with traditional treatment methods, the use of a home ventilator to treat obstructive sleep apnea has better convenience and comfort. It can be treated at home, reducing the frequency of patients going to the hospital, and improving the accessibility and convenience of treatment. In addition, existing home ventilators are usually equipped with some auxiliary functions, such as a heated humidifier to improve comfort, and the airflow can be adjusted according to the patient's own breathing, so as to meet the different needs of different patients. More and more ventilators on the current market also have intelligent functions such as data recording and monitoring of treatment effects; they can use the data of different patients using ventilators to effectively manage and regularly adjust the patient's next use of the ventilator. These auxiliary functions and data monitoring systems help patients better understand the effects of treatment and make necessary adjustments to ensure the effectiveness and continuity of treatment, while also improving the personalization and precision of treatment.

[0005] In summary, the use of home ventilators to treat obstructive sleep apnea has many advantages, including good treatment effect, convenience and comfort, personalized adjustment, intelligent monitoring, etc. Therefore, home ventilators have become one of the commonly used treatment methods for patients with obstructive sleep apnea, and have a positive effect on improving patients' sleep quality and life health. Utility Model Content

[0006] The goal of the utility model is to provide a new type of noise reduction airway used in a PAP device, which uses an internal noise reduction component in combination with a shell structure, is more conducive to manufacturing and rapid adaptation to the market, and can achieve the noise level specified by laws and regulations without foam. Patients can choose a noise reduction airway with or without foam based on their tolerance to noise. The airway without foam can ensure the health and safety of the patient. The noise reduction airway with internal foam can achieve a quieter effect than the existing airway, overcoming the limitations of similar products in the prior art, thereby providing a more effective and more widely used application scenario and space than the prior art, and in a safer way to supply continuous positive pressure airflow to the patient's respiratory tract to provide treatment for sleep apnea.

[0007] A noise reduction airway used in a PAP device, configured to generate pressurized gas and deliver it to a patient's respiratory tract, the noise reduction airway comprising:

[0008] A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall;

[0009] The space surrounded by the inner wall of the housing forms a gas passage of at least one chamber to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 - 18 times the volume of the blower;

[0010] A blower, having an inlet for receiving gas into the interior of the blower and an outlet for allowing gas to flow out, the blower being located within the chamber and configured to pressurize the gas entering the chamber and then deliver it to the air outlet of the housing;

[0011] Wherein, at least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber within the housing;

[0012] Wherein, the air outlet and the air inlet are not on the same wall of the housing;

[0013] Wherein, there is no foam within the chamber.

[0014] In one embodiment, the intake pipe is integrally formed with the housing.

[0015] In one embodiment, the distance between the blower inlet and the inner wall of the housing is greater than or equal to 5 mm.

[0016] In one embodiment, the axis of the intake pipe is parallel or perpendicular to the axis of the blower inlet.

[0017] In one embodiment, an outlet pipe is provided at the air outlet and is in communication with the blower outlet.

[0018] In one embodiment, the housing forms part of a PAP device.

[0019] The present utility model also discloses a noise reduction air passage applied to a PAP device according to an embodiment of the present application, configured to generate pressurized gas and deliver it into a patient's respiratory tract. The noise reduction air passage includes:

[0020] A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall;

[0021] The space surrounded by the inner wall of the housing forms a gas passage of at least two chambers to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 - 18 times the volume of the blower;

[0022] A blower, having an inlet for receiving gas into the interior of the blower and an outlet for allowing gas to flow out, the blower being located within the chamber and configured to pressurize the gas entering the chamber and then deliver it to the air outlet of the housing;

[0023] At least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber inside the housing;

[0024] The chamber does not contain foam.

[0025] In one embodiment, the inner wall of the housing has a silica gel layer connected thereto, which is configured to reduce the noise of the gas flowing in the gas channel.

[0026] In one embodiment, the intake pipe is located at the edge portion of the housing and is not on the same wall of the housing as the air outlet.

[0027] In one embodiment, the intake pipe has a taper.

[0028] In one embodiment, the distance from the blower inlet to the inner wall of the housing opposite thereto is at least partially greater than or equal to 2 mm.

[0029] In one embodiment, the housing forms part of the PAP device.

[0030] The present utility model also discloses a noise reduction air duct applied to a PAP device according to an embodiment of the present application, which is configured to generate pressurized gas and deliver it into the patient's respiratory tract. The noise reduction air duct includes:

[0031] A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall;

[0032] A gas channel with at least one chamber formed by the space surrounded by the inner wall of the housing to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3-18 times the volume of the blower;

[0033] A blower having an inlet for receiving gas into the blower and an outlet for allowing gas to flow out. The blower is located in the chamber and is configured to pressurize the gas entering the chamber and deliver it to the air outlet of the housing;

[0034] At least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber inside the housing;

[0035] The axis of the blower inlet and the axis of the air inlet on the housing are non-parallel.

[0036] In one embodiment, the inner wall of the housing has a silica gel layer connected thereto, which is configured to reduce the noise of the gas flowing in the gas channel.

[0037] In one embodiment, the inner wall forms at least two chambers in the gas channel.

[0038] In one embodiment, the main path of the gas in the gas passage is the air flow path, and the inner wall at a position opposite to the air flow path is provided with an arc-shaped curved surface.

[0039] In one embodiment, the distance from the blower inlet to the inner wall of the opposite housing is at least partially greater than or equal to 2 mm.

[0040] In one embodiment, the housing forms part of the PAP device.

[0041] In one embodiment, the chamber is free of foam.

[0042] The present utility model also discloses a noise reduction air duct applied to a PAP device according to an embodiment of the present application, configured to generate pressurized gas and deliver it into the patient's respiratory tract. The noise reduction air duct includes:

[0043] A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall;

[0044] A gas passage formed by a space surrounded by the inner wall of the housing forms at least two chambers to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 - 18 times the volume of the blower;

[0045] A blower having an inlet for receiving gas into the blower interior and an outlet for allowing gas to flow out, the blower being located in the chamber and configured to pressurize the gas entering the chamber and deliver it to the air outlet of the housing;

[0046] Wherein, the noise reduction air duct further includes at least one gas passage, located within the gas passage, configured to connect the chambers and provide a passage for gas to enter from one chamber into another chamber;

[0047] Wherein, the main path of the gas in the gas passage is the air flow path, the gas path has displacements on the x-axis (horizontal axis), y-axis (vertical axis), and z-axis (vertical axis) in a three-dimensional Cartesian coordinate system, and the total length of the air flow path is greater than 20 cm;

[0048] Wherein, the area of the air inlet on the housing is greater than or equal to the area of the blower inlet;

[0049] In one embodiment, at least two chambers of the gas passage include a first chamber and a second chamber, the blower is located in the first chamber and the blower inlet communicates with the second chamber.

[0050] In one embodiment, the second chamber is smaller than the first chamber.

[0051] In one embodiment, the distance between the air outlet end of the ventilation member and the inner wall of the opposite housing is at least 3.5 mm.

[0052] In one embodiment, an outlet pipe is provided at the air outlet and is in communication with the outlet of the blower.

[0053] In one embodiment, the housing forms part of the PAP device.

[0054] Implementing the noise reduction air passage of the present utility model has at least the following beneficial effects:

[0055] 1) The FDA stipulates that the noise of the registered PAP device submitted for the marketing approval of the ventilator needs to reach below 30 dB. Using foam for noise reduction is currently the simplest noise reduction method. Foam materials are easier to obtain and manufacture. Due to its special pore structure and material properties, foam can convert noise into tiny energy. Using foam for noise reduction can indeed achieve a good noise reduction effect. Placing foam inside the noise reduction air passage is the simplest, effective and common means to meet the regulatory noise level.

[0056] Therefore, almost all PAP devices on the existing market have foam in the gas passage for noise reduction. However, foam is extremely likely to cause health problems for the following reasons: ① Since the foam material is relatively soft and the surface is relatively loose, during use, it is easily worn or peeled off by the airflow, thus releasing particles. Once these particles are released, they are easily carried into the patient's respiratory tract by the airflow, causing irritation to the respiratory system, which may lead to respiratory problems, resulting in symptoms such as sore throat and cough, especially for those who already have respiratory diseases such as asthma or chronic obstructive pulmonary disease (COPD). ② Moreover, foam is usually made of synthetic materials, and these materials may contain chemical additive components remaining in the foam, and the chemicals will be gradually released as the foam is used and ages. In some cases, if the foam particles carry harmful microorganisms, it may cause potential infections, especially for those with a weakened immune system. Foam particles may also cause allergic reactions, including sneezing, flu, eye irritation, etc. ③ In addition, foam used for a long time may accumulate dust, bacteria and other pollutants. Especially the foam in the PAP device, the device is prone to inhale pollutants in the air into the interior, resulting in the growth of bacteria and increasing the risk of infection.

[0057] Therefore, when designing this utility model, special attention is paid to the safety and reliability of the airway part of the ventilator, and a series of designs and improvements are made to the ventilator, including a noise-reducing airway design without foam to reduce the potential health risks that patients may suffer when using the PAP device. When designing the gas passage and filtration system, a design without foam or with easily replaceable foam is used to reduce these potential health risks. For the health and safety of patients, this utility model designs the gas passage in a foam-free form. Since there is no foam in the gas passage, the chance of accumulation of tiny foreign objects in the gas passage is reduced, which helps to maintain the cleanliness of the gas passage. More importantly, the breathing gas is not affected by the tiny residues of the foam itself, reducing the number of particles that patients may inhale or come into contact with, ensuring the safety when using the device. This is especially important for patients who use the device for a long time, as it helps to reduce potential respiratory problems. In addition, some patients may be allergic to the particles of materials such as foam, and the foam-free design reduces the risk associated with allergic reactions. This is especially important for patients who are allergic to foam materials or sensitive to chemically treated materials. This product has verified through multiple tests that the foam-free noise-reducing airway of this utility model can improve the safety and comfort of patients when using the device.

[0058] 2) By designing the noise reduction structural parts and the internal space structure of the noise reduction airway, the noise level specified by the regulations can be achieved when there is no foam inside the noise reduction airway. ① The innovation of the utility model lies in the use of a variety of different types of noise reduction components and noise reduction structures. These noise reduction components are combined with the design of the noise reduction structure to form a set of efficient noise reduction systems and achieve significant noise reduction effects. a. The internal space structure of the noise reduction airway is planned to lengthen the flow path of the gas in the gas channel. By lengthening the gas flow path, the gas residence time in the gas channel is increased, which helps to slow down the speed of the airflow to reduce the possibility of turbulence or vortex formation during gas flow, thereby reducing the noise level. And a longer airflow path means that the gas propagates a longer distance in the channel, which gives the noise more opportunities to attenuate during the propagation process. Therefore, extending the airflow path can increase the attenuation distance of the noise, making the noise weaker when it reaches the specified position. b. The utility model also sets a ventilation component inside the gas channel for noise reduction. The ventilation component is an innovative structure that has never appeared in the airway of the PAP device on the existing market. The setting of the ventilation component effectively reduces the turbulence and eddy current of the airflow, thereby reducing the noise level caused by the airflow. In addition, the ventilation component has greater advantages than the noise reduction components in the noise reduction airway of the existing PAP device on the market. For example, the ventilation component of the utility model has a simple structure, and only one material is used for integrated molding. No extra steps are required in manufacturing and installation, which saves costs. In addition, there can be slight structural differences in different forms to optimize and upgrade the ventilation component separately, including changes in the form of its baffle. Due to its simple structure, it can not only be installed in different positions in the gas channel for noise reduction, but also a combination of multiple ventilation components of the same or different forms can be provided in the noise reduction airway, so that the ventilation component has greater freedom in different noise reduction airways. The core of the ventilation component of the utility model lies in its internal structural design, so its structure can be kept unchanged, and its external shape can be changed to adapt to different types of noise reduction airways or placed in different positions inside the noise reduction airway, such as placed in the air intake pipe for noise reduction. This flexible design enables the ventilation component to be customized according to specific application scenarios to achieve the best noise reduction effect. Regardless of the type of noise reduction airway it is used for, the ventilation component can maintain its excellent noise reduction performance, providing an efficient noise control solution for the PAP device. c. An air intake pipe is set at the location of the air inlet. Through the air intake pipe, the outside gas can enter the chamber more orderly, reducing the turbulence and noise that may be generated when the airflow enters the chamber. Secondly, the setting of the air intake pipe makes the path of the airflow in the chamber more stable, reduces the resistance when entering the chamber, and thus further reduces the noise. The setting of the air intake pipe also improves the transmission efficiency of the gas entering the chamber, improves the flow characteristics of the airflow, and thus improves the overall performance of the PAP device.d. The air inlet and the air outlet are arranged on different walls of the housing. Generally, the air inlet is one of the main sources of internal noise in the PAP device. Arranging the air inlet and the air outlet on different walls of the housing can avoid the superposition of noise at the air inlet position, thereby reducing the noise level at the air inlet position and effectively improving the overall noise reduction effect. Through the combined application of the above noise reduction structure and noise reduction components, the noise level specified by the regulations can be achieved without foam in the noise reduction airway, replacing the foam to become a more effective and safer new noise reduction method. ② Through the above noise reduction airway design of the present utility model, the noise level specified by the regulations has been achieved without foam. When foam is present inside the noise reduction airway of the present utility model, a higher noise reduction level than that of the PAP device of the present utility model without foam will be achieved. Therefore, on the premise of ensuring safety, by introducing foam or other sound insulation materials (such as silica gel, gel, etc.) into the airway, the absorption and isolation of noise in the airflow are increased, thereby further reducing the propagation and influence of noise. Compared with the situation without foam, the noise reduction airway with foam can provide a more silent breathing environment and bring a more comfortable use experience to patients. This design not only retains the noise reduction advantages in the case without foam but also further improves the noise reduction effect, enabling it to reach or even exceed the highest noise reduction level of existing PAP devices on the market, thus meeting the demand for higher-level noise reduction performance.

[0059] 3) The noise reduction airway of the present utility model has a simple structure and the advantage of modularization, which saves costs for manufacturers and is a more economical solution. The ventilation component of the present utility model has the advantage of a simple structure, which means that the ventilation component can be easily assembled or used alone according to needs, making it more efficient in the manufacturing, assembly, and maintenance processes. By modularizing the ventilation component, different components can be independently manufactured, upgraded, etc., thereby improving production efficiency and reducing production costs. Manufacturers can also form different noise reduction airways through assembly cooperation according to different airway requirements, so as to achieve customized production according to the needs of different patients or product specifications. This economical design solution not only reduces the costs of manufacturers but also provides more flexible and economical choices for patients. Moreover, since the primary purpose of the present utility model is to achieve the noise level specified by the regulations without foam and the layout and installation of foam do not need to be considered, the noise reduction airway without foam materials generally has a simpler structure inside than the airways on the existing market. The simplified structure makes the manufacturing and assembly processes of the noise reduction airway more efficient, reducing the manufacturing cost and production cycle of the device. Brief Description of the Drawings

[0060] Figure 1 It is a three-dimensional schematic diagram of a form of the noise reduction airway in Embodiment 1 of the present utility model;

[0061] Figure 2 3D schematic diagram of the housing of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0062] Figure 3 Exploded view of the housing of a form of noise reduction air duct in Embodiment 1 of the present utility model

[0063] Figure 4 3D schematic diagram of the blower of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0064] Figure 5 Exploded structure diagram of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0065] Figure 6 Air flow path diagram of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0066] Figure 7 Test scenario diagram of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0067] Figure 8 Top view of the internal structure of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0068] Figure 9 Schematic diagram of the ventilation component of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0069] Figure 10 Cross-sectional view of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0070] Figure 11 Schematic diagram of air flow passing through the ventilation component of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0071] Figure 12 Schematic diagrams of different forms of the ventilation component of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0072] Figure 13 Schematic diagram of the distance between the air outlet end of the ventilation component of a form of noise reduction air duct in Embodiment 1 of the present utility model and the inner wall of the opposite housing;

[0073] Figure 14 Schematic diagram of the taper of the intake pipe of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0074] Figure 15 Schematic diagram of the parallelism between the axis of the intake pipe and the axis of the blower inlet of a form of noise reduction air duct in Embodiment 1 of the present utility model;

[0075] Figure 16 Schematic diagram of the perpendicularity between the axis of the intake pipe of a noise reduction air duct in a form of Embodiment 1 of the present utility model and the axis of the blower inlet

[0076] Figure 17 Schematic diagram of the distance between the blower inlet and the opposite housing wall in Embodiment 1 of the present utility model

[0077] Figure 18 Schematic diagram of the noise reduction air duct placed in a coordinate system in Embodiment 1 of the present utility model

[0078] Figure 19 Schematic diagram of the total length of the air flow path of the noise reduction air duct in Embodiment 1 of the present utility model

[0079] Figure 20 Schematic diagram of the intake pipe in the chamber in Embodiment 1 of the present utility model

[0080] Figure 21 Schematic diagram of the intake port and the outlet port on the same housing wall in another embodiment of Embodiment 1 of the present utility model

[0081] Figure 22 Three-dimensional schematic diagram of the part of the noise reduction air duct housing forming a PAP device in Embodiment 1 of the present utility model

[0082] Figure 23 Cross-sectional view of the part of the noise reduction air duct housing forming a PAP device in Embodiment 1 of the present utility model

[0083] Figure 24 Schematic diagram of the noise reduction air duct chamber with foam in Embodiment 2 of the present utility model

[0084] Figure 25 Schematic diagram of the inner wall of the noise reduction air duct housing having silica gel in Embodiment 3 of the present utility model

[0085] Figure 26 Three-dimensional diagram of the noise reduction air duct with different internal structures in Embodiment 4 of the present utility model

[0086] Figure 27 Three-dimensional diagram of the noise reduction air duct with different internal structures in another embodiment of Embodiment 4 of the present utility model

[0087] Figure 28 Three-dimensional diagram of the noise reduction air duct with different internal structures in another embodiment of Embodiment 4 of the present utility model

[0088] Figure 29 Analysis schematic diagram of the internal air flow direction of the noise reduction air duct in Embodiment 1 of the present utility model Detailed implementation manners

[0089] For the convenience of understanding the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. Typical embodiments of the utility model are given in the drawings. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0091] In view of the fact that in the existing noise reduction airways applied in PAP devices on the market, foam is used for noise reduction treatment inside, and in view of the situations that the foam in this way is easily damaged and aged, is not conducive to the health and safety of patients, the manufacturing and processing steps are more complex and not conducive to environmental protection, etc., the present utility model provides a safer, more reliable and simpler-structured noise reduction airway. The noise reduction airway designed by the present utility model optimizes various disadvantages of the existing technology design. By using the noise reduction components inside the noise reduction airway, the noise reduction airway reaches the noise level specified by the regulations without foam inside the gas channel. It is a better technical utility model for patients, producers and the market. The choice of not using foam inside the noise reduction airway in the present utility model is also a sustainable and environmentally friendly design for the environment.

[0092] The following describes several structures of the noise reduction airway applied in the PAP device of the present utility model with specific examples.

[0093] Embodiment 1

[0094] This embodiment provides a noise reduction airway 1 applied in a PAP device. This embodiment provides a three-dimensional structure diagram, a structure explosion and disassembly diagram, an air flow path diagram, a test scenario diagram, a sectional view and various data diagrams of the noise reduction airway 1, as shown in Figure 1-21 , Figure 29。This embodiment relates to a noise reduction air duct 1 applied in a PAP device. The noise reduction air duct 1 includes a housing 2 composed of at least two parts. When the housing 2 is combined into a complete noise reduction air duct 1, the space formed by the inner wall 23 of the housing 2 constitutes the gas passage 3 of the noise reduction air duct 1. The gas passage 3 is often divided by the structure of the noise reduction air duct 1 into various chambers 31 and the passages for the gas to reach from one chamber 31 to another chamber 31. In some cases, the gas passage 3 is divided into two or more chambers 31. The noise reduction air duct 1 further includes a blower 4. The blower 4 has an inlet 41 for receiving gas into the blower and an outlet 42 for allowing the gas to flow out. In some cases, the noise reduction air duct 1 has an inlet pipe 211 and an outlet pipe 221, and noise reduction structural members (such as a ventilation member 5).

[0095] Specifically, the noise reduction air duct 1 includes a housing 2 composed of at least two parts. The housing 2 has at least one air outlet 22, at least one air inlet 21, an inner wall 23, and an outer wall 24. The air inlet 21, as the opening for receiving gas into the interior of the chamber 31, can be one opening or multiple openings, which does not affect its function. One end of the air outlet 22 is configured to communicate with the blower outlet 42, and the other end is connected to a hose. Therefore, in general, there is only one opening for the air outlet 22 of the noise reduction air duct 1. However, in some special cases, the air outlet 22 can also be divided into multiple openings. In this embodiment, the air outlet 22 and the air inlet 21 are not on the same wall of the housing 2. Since the noise at the air inlet 21 is usually relatively high, setting the air inlet 21 and the air outlet 22 in different planes can avoid noise superposition. For the noise reduction air duct 1 with a relatively large distance between the air inlet 21 and the air outlet 22, it is easier to reduce noise, thereby reducing the noise level generated during the operation of the noise reduction air duct 1.

[0096] When the housing 2 is assembled into a complete noise reduction air duct 1, a gas passage 3 is formed which consists of a space surrounded by the inner wall 23 of the housing and forms at least one chamber 31 to provide a space for gas aggregation and circulation. There is no foam 6 in the gas passage 3 in this embodiment. The main path of the gas in the gas passage 3 is the air flow path. The inner wall 23 at a position opposite to the air flow path is provided with an arc-shaped curved surface (a relatively round shape, and this inner wall 23 has a continuous curvature rather than an angular surface). This method can effectively reduce the resistance and friction of the air flow inside the gas passage 3, enable the gas to flow through the gas passage 3 more smoothly, and can also plan the air flow path through the curved surface to avoid sudden direction changes or obstructions when the air flow passes through the passage. The inner wall 23 forms a chamber 31 in the gas passage 3 to provide gas aggregation. The formation of the chamber 31 can effectively slow down the air flow speed, contribute to making the air flow in the gas passage 3 more gentle and stable, and thus reduce the turbulence and noise that may be generated when the gas flows. Another important function of the chamber 31 is to provide a space for storing and fixing the blower 4. The blower 4 is a core component of the noise reduction air duct 1. It is located in the chamber 31 and is configured to pressurize the gas entering the chamber 31 and then transport it to the air outlet 22 of the housing 2. The blower 4 has an inlet 41 for receiving gas into the blower 4 and an outlet 42 for allowing gas to flow out. To ensure the noise reduction effect of the noise reduction air duct 1, after searching for information and conducting multiple tests, it is determined that the sum of the volumes of the chambers 31 is 3 - 18 times the volume of the blower 4 is the best. The noise reduction air duct 1 has an air inlet 21. And to ensure that a sufficient flow of gas enters the internal air duct of the blower 4, the area of the air inlet 21 provided on the housing 2 is greater than or equal to the area of the blower inlet 41. The path of the gas flowing through the noise reduction air duct 1 is: entering the chamber 31 from the air inlet 21, flowing through the gas passage 3 and then entering the internal passage of the blower 4 from the blower inlet 41 (such as Figure 6 in ①②), reaching the air outlet 22 through the blower outlet 42 to discharge the pressurized gas from the noise reduction air duct 1 (such as Figure 6 in ③). In the present utility model, the path of the gas in the noise reduction air duct 1 has at least two turns, and the path of the gas in the gas passage 3 has displacements on the x-axis (horizontal axis), y-axis (vertical axis), and z-axis (vertical axis) in the three-dimensional Cartesian coordinate system. The air flow path of the gas in the gas passage 3 has at least three height differences. This method further lengthens the air flow path in the vertical direction, and the shortest height difference length is greater than or equal to 15 mm. And the total length of the air flow path is greater than 20 cm, preferably in the range of 20 cm - 80 cm, and more preferably in the range of 20 cm - 40 cm (such as Figure 18 、 19As shown). The range of this path length is obtained when the sum of the volumes of the optimal chambers 31 is 3 to 18 times the volume of the blower 4. Calculate the sum of the connecting straight lines of the turning points of the air flow path (if the turning point is an opening, the turning point is the center point of the opening, such as the center point of the air inlet 21, the center point of the air inlet end of the ventilation member 5, and the center point of the blower inlet 41). In some cases, the inner wall 23 forms at least two chambers 31 in the gas passage 3 to provide gas accumulation. Except for the chamber 31 storing the blower 4, a second chamber 312 can be provided at the position where the gas enters the blower 4. That is, in one case, the inner wall 23 forms at least two chambers 31 in the gas passage 3. The at least two chambers 31 of the gas passage 3 include a first chamber 311 and a second chamber 312. The blower 4 is located in the first chamber 311 and the blower inlet 41 communicates with the second chamber 312, where the second chamber 312 is smaller than the first chamber 311. After the gas accumulates stably in the second chamber 312, it enters the internal passage of the blower 4 through the blower inlet 41. In addition, the distance between the blower inlet 41 and the inner wall 23 of the housing 2 is greater than or equal to 5 mm (such as Figure 17 in d2≥5 mm), and this design takes into account the uniform distribution and stability of the air flow. The setting of this distance ensures that the air flow will not be subject to excessive resistance or sudden speed changes when entering the blower 4, thereby reducing the possible turbulence phenomenon in the gas flow. This stable air flow can effectively reduce the noise level during the air flow movement. The distance from the blower inlet 41 to the inner wall 23 of the opposite housing 2 is at least partially greater than or equal to 2 mm. By maintaining a certain distance between the inner wall 23 of the housing 2 and the blower inlet 41, the resistance received by the gas before entering the blower 4 can be reduced, thereby reducing the possibility of sudden changes in air flow velocity and the formation of eddy currents. This spatial design helps to stabilize the air flow and effectively reduces the possible noise and vibration during the air flow movement.

[0097] The noise reduction air passage 1 also has at least one intake pipe 211 located at the air inlet 21 and connected thereto, configured to send the gas in the external environment into the chamber in the housing 2. The connection form between the intake pipe 211 and the housing 2 can be integrally formed, or the intake pipe 211 can be directly or indirectly connected to the air inlet 21 on the housing 2 as an independent component. Due to the structural limitations inside the noise reduction air passage 1, such as Figure 16 shown, the axis of the blower inlet 41 and the axis of the air inlet 21 on the housing 2 are non-parallel, such as perpendicular (as Figure 15 shown, in another embodiment, they can also be parallel). In this embodiment, the intake pipe 211 has a taper 2111, and by using the gradually reduced cross-sectional area of the intake passage, the air flow entering the chamber 31 from the air inlet 21 is sorted out to make it enter the interior of the chamber 31 more smoothly and evenly (such as Figure 14As shown, this design helps reduce the resistance of the airflow entering the chamber 31, thereby reducing noise generation. At the same time, the intake pipe 211 can also improve the transmission efficiency and improve the flow characteristics of the airflow. In some cases, the intake pipe 211 is in the shape of a straight cylinder without a taper. In some cases, the intake pipe 211 is located at the edge part of the housing 2 (the side away from the center point of the noise reduction air passage 1 and close to the external environment), which can make the most of the space of the housing 2 and make the entire gas passage 3 space more compact. The form of isolating the intake pipe 211 from the internal chamber 31 can also effectively plan the path of the gas in the gas passage 3 and reduce the unnecessary flow of the gas in the gas passage 3, such as part of the gas flowing into the gap between the intake pipe 211 and the wall of the housing 2 (as Figure 20 shown). The intake pipe 211 is integrally formed with the housing 2 or can be physically or chemically connected to the housing 2. In addition, at the air outlet 22, there is an outlet pipe 221 connected to the blower outlet 42. The outlet pipe 221 is configured to be connected to the blower 4 outlet, and the outlet pipe 221 is integrally formed with the housing 2. In some cases, the outlet pipe 221 can also be connected to the air outlet 22 of the housing 2 as an independent component. One end of the outlet pipe 221 close to the blower 4 is configured to communicate with the blower outlet 42. This communication means that the port of the outlet pipe 221 close to the blower 4 can be directly connected and fixed to the blower outlet 42 or can be connected to the blower outlet 42 through one or more connecting components.

[0098] The noise reduction air duct 1 further includes at least one ventilation member 5, which is located in the gas passage 3 and configured to communicate with the chambers 31 and provide a passage for gas to enter from one chamber 31 into another chamber 31. The specific form of the ventilation member 5 is that it has gaps inside. When the air flow passes through the ventilation member 5, it is divided by the ventilation member 5, and the divided small air flows flow out through the gaps inside the ventilation member 5. This form of ventilation member 5 can organize the air flow in the originally disordered gas passage 3, achieving effective noise reduction of at least 1.5 decibels. Specifically, the ventilation member 5 has a plurality of baffles placed parallel to each other inside. There are gaps between the baffles, and the gaps between the baffles are the gaps inside the ventilation member 5. The ventilation member 5 can have various forms. Generally, the baffles are in a long strip form, and the edges of the baffles can have sharp corners to help better divide the air flow. In some forms, the baffles can also be in a form with outward expansion or inward contraction, so that the air flow has an acceleration or decelerates when passing through the gaps of the ventilation member 5. The ventilation member 5 can also be parallel baffles with two or more angles, and the channels for dividing the air flow are formed by the intersection of the baffles with different angles. To enable the gaps of the ventilation member 5 to allow the gas to pass through easily and without generating noise, the gap range of the ventilation member 5 is 0.8 mm - 2.2 mm. The ventilation member 5 has an air inlet end and an air outlet end. To enable the gas to have sufficient space to enter the ventilation member 5, the distance between the air outlet end of the ventilation member 5 and the inner wall 23 of the opposite housing 2 is at least 3.5 mm (as shown by d1 in Figure 13 ). In some cases, multiple identical or different ventilation members 5 can be arranged inside the gas passage 3 to cooperate with each other for noise reduction (as shown by Figure 12 ). Specifically, the inner part of the gas passage 3 can have ventilation members 5 with the same or different forms (such as having different baffle angles or the baffles having a taper) with their end faces closely attached to each other so that their gaps are communicated. In some cases, the ventilation members 5 with the same or different forms are respectively placed at different positions inside the gas passage 3. In some embodiments, the ventilation member 5 and the gas passage 3 are integrally formed.

[0099] In another embodiment, the air outlet 22 and the air inlet 21 are on the same wall of the housing 2 (as shown by Figure 21 ).

[0100] In another embodiment, the housing 2 forms part of the PAP device (as shown by Figure 22 , Figure 23 ), that is, at least part of the blower 4 is exposed inside the housing 2 of the PAP device, that is, at least part of the housing 2 of the noise reduction air duct 1 is the same part as the housing 2 of the PAP device.

[0101] Embodiment 2

[0102] This embodiment provides a noise reduction air duct 1 applied in a PAP device. Refer to Figure 24。This embodiment provides a schematic structural diagram of the noise reduction airway 1. In Figure 24 In the embodiment of the present utility model shown, the difference from the noise reduction airway 1 in Embodiment 1 is that: there is foam 6 in the chamber 31. The noise reduction airway 1 of the present utility model can reach the noise level specified by regulations without foam 6 inside it. Therefore, the present utility model can meet different needs of patients for noise or greater safety. Some patients may pay more attention to the impact of the PAP device on human health. Therefore, these patients can choose the noise reduction airway 1 without foam 6 inside to fundamentally eliminate potential health hazards brought by the foam 6 material. On the other hand, some patients may be more concerned about the noise reduction effect of the PAP device. On the premise of ensuring health, the present utility model adds foam 6 inside the noise reduction airway 1 to achieve a more noise reduction effect, which can achieve a more noise reduction effect than the noise reduction airway 1 in existing PAP devices on the market, reducing the noise further on the basis of originally reaching the noise level specified by regulations without foam 6. This design creates a quieter and more comfortable breathing environment for patients and meets the personalized needs of different patients.

[0103] Embodiment 3

[0104] This embodiment provides a noise reduction airway 1 applied in a PAP device. Refer to Figure 25 。This embodiment provides a schematic structural diagram of the noise reduction airway 1. In Figure 25 In the embodiment of the present utility model shown, the difference from the noise reduction airway 1 in Embodiment 1 is that: the inner wall 23 of the housing 2 has a silica gel layer 7 connected thereto, configured to reduce the noise of the gas flowing in the gas passage 3. First of all, the silica gel material has excellent sound absorption and sound insulation properties, and can effectively absorb and slow down the noise of the gas flowing in the noise reduction airway 1, thereby reducing the overall noise level of the device. The silica gel material used in this embodiment has greater softness and elasticity. Placing the silica gel material on the inner wall 23 of the housing 2 enables it to effectively absorb the vibration generated when the air flow passes through, thereby preventing the noise from spreading to the outside of the noise reduction airway 1. Secondly, the silica gel material has a soft and smooth surface. By covering the inner wall 23 of the housing 2, a buffer layer is formed on the inner surface of the housing 2, which can resist high temperature, wear, etc. and can keep the PAP device stable in performance during long-term use, extending the service life of the device. Its durability and stability enable the PAP device to maintain an efficient noise reduction effect for a long time and provide a continuous and stable breathing environment for patients. In addition, the silica gel material also has good biocompatibility, is harmless to the human body, and will not cause allergies or other adverse reactions. Therefore, it can be safely used in the PAP device that is in direct contact with patients. The selection of this material further improves the safety and comfort of the PAP device, ensures that patients will not be affected by any adverse effects during use, and improves the patient's use experience.

[0105] In another embodiment, other materials with sound insulation or sound absorption effects, except for the silica gel layer 7, can also be provided on the inner wall 23 of the housing 2 of the noise reduction air duct 1 for noise reduction.

[0106] Embodiment 4

[0107] This embodiment provides a noise reduction air duct 1 applied in a PAP device. Refer to Figure 26 . This embodiment provides a structural schematic diagram of the noise reduction air duct 1. In Figure 26 the embodiment of the present utility model shown, the difference from the noise reduction air duct 1 in Embodiment 1 is that the placement position of the blower 4 in the noise reduction air duct 1 is different from that in Embodiment 1. Specifically, the air flow path is in a substantially planar form in the noise reduction air duct 1, without or having a short vertical path (the path length in the vertical direction is less than 40 mm), and the chamber 31 of the noise reduction air duct 1 is divided left and right or front and back, rather than up and down. The air flow has a substantially S-shaped air flow path in the gas channel 3, and there is no obvious intersection of the air flow paths in the top view. The noise reduction structure or component of the present utility model can be placed in different noise reduction air ducts 1 for noise reduction, so as to achieve the noise reduction effect.

[0108] In another embodiment, two other structures of the noise reduction air duct 1 are derived from Embodiment 4, where the inlet pipe 211 is perpendicular or parallel to the axis of the blower 4 (as Figure 27 , Figure 28 shown).

[0109] Implementing the noise reduction air duct 1 of the present utility model has at least the following beneficial effects:

[0110] 1) The FDA stipulates that the noise of a PAP device that needs to be registered for the market approval of a ventilator should reach below 30 dB. Using the foam 6 for noise reduction is currently the simplest noise reduction method. The foam 6 material is easier to obtain and manufacture. Due to its special pore structure and material properties, the foam 6 can convert noise into tiny energy. Using the foam 6 for noise reduction can indeed achieve a good noise reduction effect. Placing the foam 6 inside the noise reduction air duct 1 is the simplest, effective, and common means to meet the noise level stipulated by the regulations.

[0111] Therefore, almost all PAP devices on the existing market have foam 6 present in the gas channels for noise reduction. However, foam 6 can easily cause health problems for the following reasons: ① Since the foam 6 material is relatively soft and the surface is relatively porous, during use, it is easily worn or peeled off by the airflow, thus releasing particles. Once these particles are released, they are likely to enter the patient's respiratory tract along with the airflow, irritating the respiratory system, which may cause respiratory problems, leading to symptoms such as sore throat and cough, especially for those who already have respiratory diseases such as asthma or chronic obstructive pulmonary disease (COPD). ② Moreover, foam 6 is usually made of synthetic materials, and these materials may contain chemical additive components remaining in the foam 6, and the chemicals will gradually be released as the foam 6 is used and ages. In some cases, if the foam 6 particles carry harmful microorganisms, it may lead to potential infections, especially for those with a weakened immune system. The foam 6 particles may also trigger allergic reactions, including sneezing, flu, eye irritation, etc. ③ In addition, the foam 6 used for a long time may accumulate dust, bacteria, and other pollutants. Especially for the foam 6 in the PAP device, the device is prone to inhaling pollutants in the air into the interior, resulting in the growth of bacteria and increasing the risk of infection.

[0112] Therefore, when designing this utility model, special attention is paid to the safety and reliability of the airway part of the ventilator, and a series of strict safety measures are taken, including the design of a noise-reducing airway 1 without foam 6, so as to reduce the potential health risks that patients may suffer when using the PAP device. When designing the gas channel 3 and the filtration system, a design without foam 6 or easily replaceable foam 6 is used to reduce these potential health risks. For the health and safety of patients, this utility model designs the gas channel 3 in a form without foam 6. Since there is no foam 6 in the gas channel 3, the chance of tiny foreign objects accumulating in the gas channel 3 is reduced, which helps to maintain the cleanliness of the gas 1 channel. More importantly, the breathing gas will not be affected by the tiny residues of the foam 6 itself, reducing the number of particles that the patient may inhale or come into contact with, ensuring the safety when using the device. This is especially important for patients who use the device for a long time, as it helps to reduce potential respiratory problems. In addition, some patients may be allergic to the particles of materials such as foam 6, and the design without foam 6 reduces the risk associated with allergic reactions. This is especially important for those patients who are allergic to the foam 6 material or sensitive to chemically treated materials. This product has verified through multiple tests that the noise-reducing airway 1 without foam 6 of this utility model can improve the safety and comfort of patients when using the device.

[0113] 2) Through the design of each noise reduction structural member and the internal space structure of the noise reduction air duct 1, the noise level specified by the regulations can be achieved when there is no foam 6 inside the noise reduction air duct 1. ① The innovation of the present utility model lies in the adoption of various different types of noise reduction components and noise reduction structures. The combination of the designs of these noise reduction components and structures forms an efficient noise reduction system and achieves remarkable noise reduction effects. a. For example, the internal space structure of the noise reduction air duct 1 is planned to lengthen the flow path of the gas in the gas passage 3. By lengthening the flow path of the gas, the residence time of the gas in the gas passage 3 is increased, which helps to slow down the speed of the air flow to reduce the possibility of the formation of turbulence or eddies during gas flow, thereby reducing the noise level. And the longer air flow path means that the gas travels a longer distance in the passage, which gives more opportunities for the noise to attenuate during propagation. Therefore, extending the air flow path can increase the attenuation distance of the noise and make the noise become weaker when it reaches the specified position. b. The present utility model also sets a ventilation component inside the gas passage 3 for noise reduction. The ventilation component 5 is an innovative structural component that has never appeared in the air ducts of PAP devices on the existing market. The setting of the ventilation component 5 effectively reduces the turbulence and eddies of the air flow, thereby reducing the noise level brought by the air flow. Moreover, the ventilation component 5 has greater advantages than the noise reduction components in the noise reduction air duct 1 of the existing market PAP devices. For example, the structure of the ventilation component 5 of the present utility model is simple, and it is integrally formed with only one material without unnecessary steps, saving costs in the manufacturing and installation steps. In addition, there can be different forms of minute structural differences to individually optimize and upgrade the ventilation component 5, including changes in the form of its baffles. Due to its simple structure, not only can the ventilation component 5 be installed at different positions in the gas passage 3 for noise reduction, but also it can be used in the noise reduction air duct 1 through the combination of different forms of ventilation components 5, giving the ventilation component 5 greater freedom in different noise reduction air ducts 1 to give full play to its role without being restricted. The core of the ventilation component 5 of the present utility model lies in its internal structure design. Therefore, its structure can be kept unchanged while its external shape is changed to adapt to different types of noise reduction air ducts 1 or placed at different positions inside the noise reduction air duct 1, such as placed in the intake pipe for noise reduction. This flexible design enables the ventilation component 5 to be customized according to specific application scenarios to achieve the best noise reduction effect. No matter which type of noise reduction air duct 1 it is applied to, the ventilation component 5 can maintain its excellent noise reduction performance and provide an efficient noise control solution for the PAP device. c. An intake pipe is provided at the position where the air inlet 21 is located. Through the intake pipe, the outside gas can enter the chamber 31 more orderly, reducing the turbulence and noise that may be generated when the air flow enters the chamber 31. Secondly, the setting of the intake pipe makes the air flow path in the chamber 31 more stable, reducing the resistance when entering the chamber 31, thereby further reducing the noise.The arrangement of the intake pipe also improves the transfer efficiency of the gas entering the chamber 31, improves the flow characteristics of the air flow, and thus enhances the overall performance of the PAP device. d. The intake pipe and the air outlet 22 are arranged on different walls of the housing 2. Generally, the intake port 21 is one of the main sources of internal noise of the PAP device. Arranging the intake port 21 and the air outlet 22 on different walls of the housing 2 can avoid the superposition of noise at the position of the intake port 21, thereby reducing the noise level at the position of the intake port 21 and effectively enhancing the overall noise reduction effect. Through the combined application of the above noise reduction structure and noise reduction components, the noise level specified by the regulations can be achieved inside the noise reduction airway 1 without the foam 6, replacing the foam 6 as a more effective and safer new noise reduction method. ② Through the above design of the noise reduction airway 1 of the present utility model, the noise level specified by the regulations has been achieved without the foam 6. When the foam 6 is provided inside the noise reduction airway 1, a higher noise reduction level than that of the PAP device of the present utility model without foam will be achieved. By introducing the foam 6 into the airway, the absorption and isolation of noise in the air flow can be increased, thereby further reducing the propagation and influence of noise. Compared with the situation without the foam 6, the noise reduction airway 1 with the foam 6 can provide a more silent breathing environment and bring a more comfortable use experience to the patient. This design not only retains the noise reduction advantage in the case without the foam 6, but also further enhances the noise reduction effect, enabling it to reach or even exceed the highest noise reduction level of the PAP devices on the existing market, thus meeting the demand for higher-level noise reduction performance.

[0114] 3) The noise reduction airway 1 of the present utility model has a simple structure and the advantage of modularization, which saves costs for the manufacturer and is a more economical solution. The ventilation member 5 of the present utility model has the advantage of a simple structure, which means that the ventilation member can be easily assembled or used alone according to needs, making it more efficient in the manufacturing, assembly, and maintenance processes. By modularizing the ventilation member 5, different components can be independently manufactured, upgraded, etc., thereby improving the production efficiency and reducing the production cost. The manufacturer can also form different noise reduction airways 1 through assembly cooperation according to different airway requirements, so as to achieve customized production according to the needs of different patients or the specifications of the product. This economical design solution not only reduces the cost of the manufacturer, but also provides a more flexible and economical choice for the patient, further promoting the development of the noise reduction airway 1. Moreover, since the primary condition of the present utility model is to achieve the noise level specified by the regulations without the foam 6 and the layout and installation of the foam 6 do not need to be considered, the noise reduction airway without the foam 6 material usually has a simpler structure inside than the airways on the existing market. The simplified structure makes the manufacturing and assembly processes of the noise reduction airway 1 more efficient, reducing the manufacturing cost and production cycle of the device.

[0115] The embodiments of the utility model have been described above in conjunction with the accompanying drawings. However, the utility model is not limited to the specific embodiments described above. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the utility model, those of ordinary skill in the art can also make many forms without departing from the purpose of the utility model and the scope protected by the claims. All of these fall within the protection scope of the utility model.

Claims

1. A noise reduction airway applied in a PAP device, configured to generate pressurized gas and deliver it into a patient's respiratory tract, characterized in that, The noise reduction air duct includes: A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall; A gas passage forming at least one chamber surrounded by the inner wall of the housing to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 to 18 times the volume of the blower; A blower having an inlet for receiving gas into the interior of the blower and an outlet for allowing gas to flow out, the blower being located in the chamber and configured to pressurize the gas entering the chamber and then deliver it to the air outlet of the housing; Wherein, at least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber in the housing; Wherein, the air outlet and the air inlet are not on the same wall of the housing; Wherein, there is no foam in the chamber; 2. The noise reduction air duct according to claim 1, characterized in that, The intake pipe is integrally formed with the housing; 3. The noise reduction air duct according to claim 1, characterized in that, The distance between the inlet of the blower and the inner wall of the housing is greater than or equal to 5 mm; 4. The noise reduction air duct according to claim 1, wherein The axis of the intake pipe is parallel or perpendicular to the axis of the inlet of the blower; 5. The noise reduction air duct according to claim 1, characterized in that An outlet pipe is provided at the air outlet and is communicated with the outlet of the blower; 6. The noise reduction air duct according to claim 1, characterized in that, The housing constitutes part of the PAP device; 7. A noise reduction airway applied in a PAP device, configured to generate pressurized gas and deliver it into a patient's respiratory tract, characterized in that, The noise reduction air duct includes: A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall; A gas passage forming at least two chambers surrounded by the inner wall of the housing to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 to 18 times the volume of the blower; A blower having an inlet for receiving gas into the interior of the blower and an outlet for allowing gas to flow out, the blower being located in the chamber and configured to pressurize the gas entering the chamber and then deliver it to the air outlet of the housing; Wherein, at least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber in the housing; Wherein, there is no foam in the chamber; 8. The noise reduction air duct according to claim 7, characterized in that, The inner wall of the housing has a silica gel layer connected thereto, configured to reduce the noise of the gas in the gas passage; 9. The noise reduction air passage according to claim 7, characterized in that, The intake pipe is located at the edge portion of the housing and is not on the same wall of the housing as the air outlet; 10. The noise reduction air duct according to claim 7, characterized in that, The intake pipe has a taper; 11. The noise reduction air duct according to claim 7, characterized in that, The distance from the inlet of the blower to the inner wall of the housing opposite thereto is at least partially greater than or equal to 2 mm; 12. The noise reduction air duct according to claim 7, characterized in that, The housing constitutes part of the PAP device; 13. A noise reduction airway applied in a PAP device, configured to generate pressurized gas and deliver it into the patient's respiratory tract, characterized in that, The noise reduction air duct includes: A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall; A gas passage forming at least one chamber surrounded by the inner wall of the housing to provide space for gas aggregation and circulation, wherein the sum of the volumes of the chambers is 3 to 18 times the volume of the blower; A blower having an inlet for receiving gas into the interior of the blower and an outlet for allowing gas to flow out, the blower being located in the chamber and configured to pressurize the gas entering the chamber and then deliver it to the air outlet of the housing; Wherein, at least one intake pipe is located at and connected to the air inlet, and is configured to send the gas in the external environment into the chamber in the housing; Wherein, the axis of the inlet of the blower and the axis of the air inlet of the housing are non-parallel; 14. The noise reduction air duct according to claim 13, wherein, The inner wall of the housing has a silica gel layer connected thereto, configured to reduce the noise of the gas in the gas passage; 15. The noise reduction air duct according to claim 13, wherein The inner wall is configured to form at least two chambers in the gas passage for gas accumulation.

16. The noise reduction air duct according to claim 13, wherein The main path of the gas in the gas passage is the air flow path, and the inner wall at a position opposite to the air flow path is provided with an arc-shaped curved surface.

17. The noise reduction air duct according to claim 13, wherein The distance from the blower inlet to the inner wall of the opposite housing is at least partially greater than or equal to 2 mm.

18. The noise reduction air duct according to claim 13, wherein, The housing forms part of the PAP device.

19. The noise reduction air duct according to claim 13, characterized in that, There is no foam in the chamber.

20. A noise reduction airway applied in a PAP device, configured to generate pressurized gas and deliver it into a patient's respiratory tract, characterized in that, The noise reduction air passage includes: A housing composed of at least two parts, the housing having at least one air outlet, at least one air inlet, an inner wall and an outer wall; A gas passage formed by a space surrounded by the inner wall of the housing to form at least two chambers, so as to provide space for gas accumulation and circulation, wherein the sum of the volumes of the chambers is 3-18 times the volume of the blower; A blower having an inlet for receiving gas into the blower interior and an outlet for allowing gas to flow out, the blower being located in the chamber and configured to pressurize the gas entering the chamber and deliver it to the air outlet of the housing; Wherein, the noise reduction air passage further includes at least one ventilation member located in the gas passage, configured to communicate the chambers and provide a passage for gas to enter from one chamber to another chamber; Wherein, the main path of the gas in the gas passage is the air flow path, the air flow path has displacements on the x-axis, y-axis, and z-axis in a three-dimensional Cartesian coordinate system, and the total length of the air flow path is greater than 20 cm; Wherein, the area of the air inlet of the housing is greater than or equal to the area of the blower inlet.

21. The noise reduction air duct according to claim 20, wherein, At least two chambers of the gas passage include a first chamber and a second chamber, the blower is located in the first chamber and the blower inlet communicates with the second chamber.

22. The noise reduction air duct according to claim 21, wherein, The second chamber is smaller than the first chamber.

23. The noise reduction air duct according to claim 20, wherein, The ventilation member has an air inlet end and an air outlet end, and the distance from the air outlet end to the inner wall of the opposite housing is at least 3.5 mm.

24. The noise reduction air duct according to claim 20, wherein An outlet pipe is provided at the air outlet and is communicated with the blower outlet.

25. The noise reduction air duct according to claim 20, wherein The housing forms part of the PAP device.

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