A noise reduction device and a ventilator

Abstract

This specification provides a noise reduction device, which includes an air intake structure, a housing, a fan chamber, and an air duct. Gas enters the air duct through the air intake structure. The air duct is located between the inner wall of the housing and the outer wall of the fan chamber. The air duct is used to transmit airflow. The fan chamber has at least two air inlets along the direction of airflow. The noise reduction device provided in this specification uses at least two air inlets to divert airflow into the fan chamber, reducing the impact of airflow turbulence and effectively reducing the noise of airflow entering the fan chamber.

Description

Technical Field

[0001] This specification relates to the field of ventilator technology, and in particular to a noise reduction device for a ventilator, and a ventilator. Background Technology

[0002] As a device providing artificial ventilation, the ventilator is widely used in the treatment of respiratory failure, sleep apnea-hypopnea syndrome, and other diseases caused by various reasons, and it occupies a very important position in the field of modern medicine. When users use ventilators to treat respiratory diseases, the ventilator needs to draw in air from the outside and process it through a series of gas steps before supplying it to the user for breathing. This process often generates considerable noise, affecting the user's experience. The main sources of noise are the noise generated by airflow and the noise generated by the fan operation, so noise reduction devices are needed to address the noise generated during the use of the ventilator. Summary of the Invention

[0003] One embodiment of this specification provides a noise reduction device. The noise reduction device includes: an air intake structure, a housing, a fan chamber, and an air duct; the air duct is located between the inner wall of the housing and the outer wall of the fan chamber; the air duct is used to transmit airflow; the fan chamber is provided with at least two air inlets along the direction of airflow; gas enters the air duct through the air intake structure, and then enters the fan chamber through the air inlets.

[0004] In some embodiments, the air passage has at least three spaces along the airflow direction, and the spaces are arranged in a large cavity and a small cavity at intervals, with the air inlet located in the large cavity space adjacent to the small cavity.

[0005] In some embodiments, the air duct has at least a first space, a second space, and a third space in the direction of airflow; the first space is larger than the second space, and the second space is smaller than the third space; the fan chamber has at least a first air inlet and a second air inlet, the first air inlet being located in the first space, and the second air inlet being located in the third space.

[0006] In some embodiments, the air duct further includes a fourth space and a fifth space in the direction of airflow; the fourth space is smaller than the third space, and the fifth space is larger than the fourth space; the fan chamber further includes a third air inlet, which is located in the fifth space.

[0007] In some embodiments, the air intake structure includes an air intake pipe; the air intake pipe has one or more baffles inside the pipe to divide the air intake pipe into two or more air intake sub-pipes.

[0008] In some embodiments, the partition is in the shape of a "well" and divides the intake pipe into nine intake sub-pipes.

[0009] In some embodiments, the air intake structure includes an air intake pipe; the air intake pipe is horizontally disposed within the housing, and the angle between the centerline of the air intake pipe and the outer wall of the fan chamber is less than 90°.

[0010] In some embodiments, the air inlet is positioned vertically close to the motor portion of the fan in the fan chamber and away from the base portion of the fan, so that the airflow enters the fan chamber through the air inlet and cools the fan.

[0011] In some embodiments, a porous sound-absorbing plate and / or sound-absorbing cotton are placed in the airway.

[0012] In some embodiments, the porous sound-absorbing panel includes multiple regions, and the aperture of the sound-absorbing holes in each region is set according to a preset rule.

[0013] In some embodiments, the porous sound-absorbing panel includes a porous top plate, a porous side plate, and a porous bottom plate; the porous sound-absorbing panel has a plurality of sound-absorbing holes in its thickness direction; the diameter of the sound-absorbing holes on the porous top plate, porous side plate, and / or porous bottom plate is set according to a preset rule.

[0014] In some embodiments, the sound-absorbing cotton is non-porous sound-absorbing cotton.

[0015] In some embodiments, the vertical position of the air outlet of the air intake structure is lower than the vertical position of the air intake.

[0016] One embodiment of this specification provides a ventilator. The ventilator includes the noise reduction device described in any of the above embodiments.

[0017] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: using at least two air inlets to divert the gas in the air duct into the fan chamber, reducing the phenomenon of airflow turbulence, and effectively reducing the noise of airflow entering the fan chamber. Attached Figure Description

[0018] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0019] Figure 1 This is a schematic perspective view of the noise reduction device (without top shell installed) according to some embodiments of this application;

[0020] Figure 2 This is a schematic top view of the structure of a noise reduction device (without the top shell) according to some embodiments of this application;

[0021] Figure 3 This is a schematic top view of the noise reduction device (without the top shell) according to other embodiments of this application;

[0022] Figure 4 This is a schematic perspective view of the noise reduction device (without the top shell) according to some embodiments of this application;

[0023] Figure 5 This is a three-dimensional structural schematic diagram of a porous sound-absorbing plate in a noise reduction device according to some embodiments of this application;

[0024] Figure 6 This is a top view of the porous sound-absorbing plate in a noise reduction device according to some embodiments of this application;

[0025] In the diagram: 100, noise reduction device; 110, air inlet pipe; 111, partition; 112, air inlet sub-pipe; 120, housing; 130, fan chamber; 131, first air inlet; 132, second air inlet; 133, third air inlet; 140, air duct; 141, first space; 142, second space; 143, third space; 144, fourth space; 145, fifth space; 150, perforated sound-absorbing panel; 151, perforated top plate; 152, perforated side plate; 153, perforated bottom plate; 154, sound-absorbing hole; 155, first area; 156, second area; 157, third area. Detailed Implementation

[0026] Exemplary embodiments or implementations will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0027] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "front," "rear," "lower," and / or "upper" and similar terms are for illustrative purposes only and are not limited to a location or spatial orientation. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects.

[0029] Home-use sleep apnea machines are primarily used in homes, sleep centers, and small clinics for patients with sleep apnea syndrome. During treatment, the patient is in a sleep state, requiring a quiet and comfortable environment. The machine uses a fan to pressurize the airflow within the ventilation system, thus providing supplemental therapy. With increasing emphasis on respiratory therapy, the performance requirements for ventilators are also rising. Noise is a highly noticeable factor for users, significantly impacting their experience. The primary source of noise is the airflow within the ventilator's ventilation system. The noise generated when air enters the fan chamber from the inlet accounts for the majority of the noise. Additionally, the fan's vibration and rotation also contribute to the noise. Therefore, noise reduction devices are necessary to mitigate the noise generated during ventilator use.

[0030] For the reasons mentioned above, some embodiments of this application provide a noise reduction device, including an air inlet pipe, a housing, a fan chamber, and an air duct. The fan is installed inside the fan chamber, and the air duct is located between the housing and the fan chamber. The fan chamber has at least two air inlets along the airflow direction. Using at least two air inlets to divert airflow into the fan chamber reduces airflow turbulence and effectively reduces noise from the airflow entering the fan chamber.

[0031] It should be understood that the application scenarios of the noise reduction device of this application are merely some examples or embodiments of this application. For those skilled in the art, without creative effort, this application can be applied to other similar scenarios based on these drawings.

[0032] The following will combine Figures 1-6 The noise reduction device involved in the embodiments of this specification will be described in detail. It should be noted that the following embodiments are only used to explain this application and do not constitute a limitation on this application.

[0033] Figure 1This is a schematic perspective view of the noise reduction device (without top shell installed) according to some embodiments of this application; Figure 2 This is a schematic top view of the structure of a noise reduction device (without the top shell) according to some embodiments of this application.

[0034] In some embodiments, see Figure 1 and Figure 2 The noise reduction device 100 may include an air intake structure, a housing 120, a fan chamber 130, and an air duct 140. The air intake structure is used to connect to an externally supplied gas (e.g., air) to guide the gas into the noise reduction device 100. The fan chamber 130 is used to house a fan 134. In some embodiments, the housing 120 may include a top shell and a bottom shell, the top shell being fixedly connected to the bottom shell by means of screws or the like. For ease of illustration of the internal structure of the noise reduction device 100, Figure 1 and Figure 2 The top shell is not installed; the housing 120 in the figure only shows the bottom shell. In some embodiments, the housing 120 may consist only of the bottom shell, with a matching top shell integrated into the ventilator.

[0035] See Figure 2 The air duct 140 is located between the inner wall of the housing 120 and the outer wall of the fan chamber 130. The air duct 140 is used to transport gas input from the intake structure, and the gas advancing along the air duct 140 forms an airflow. The fan chamber 130 has at least two air inlets along the airflow direction. Gas enters the air duct 140 through the intake structure and then enters the fan chamber 130 through the at least two air inlets. Using at least two air inlets diverts the gas in the air duct 140 into the fan chamber 130, reducing airflow turbulence and effectively reducing noise from the airflow entering the fan chamber 130.

[0036] In some embodiments, the fan chamber 130 has two air inlets along the airflow direction. In some embodiments, the two air inlets can be located at the beginning and end of the air duct 140, making the distance between the two air inlets relatively large. Gas enters the air duct 140 from the air intake structure, with a portion entering the fan chamber 130 from the air inlet located at the beginning of the air duct 140, and another portion advancing along the air duct 140 and entering the fan chamber 130 from the other air inlet located at the beginning of the air duct 140. As a portion of the airflow flows within the longer air duct 140, noise can be gradually reduced by the air duct 140, thus achieving a noise reduction effect.

[0037] In some embodiments, the fan chamber 130 is provided with three air inlets along the airflow direction. In some embodiments, the three air inlets may be located at the beginning, middle, and end of the air duct 140. In some embodiments, the distance between each pair of the three air inlets may be designed according to conditions such as air resistance and air pressure within the air duct 140, and may be evenly or unequally distributed.

[0038] In some embodiments, the air passage 140 has at least three spaces along the airflow direction, and each space is arranged in a large cavity and a small cavity at intervals, with at least two air inlets disposed in at least two large cavity spaces adjacent to the small cavity.

[0039] In some embodiments, the airway 140 has at least a first space 141, a second space 142, and a third space 143 in the direction of airflow. Figure 2 Two dashed lines are used to divide the airway 140 into a first space 141, a second space 142, and a third space 143. In some embodiments, from... Figure 2 As shown in the top view, the first space 141 is located at the beginning of the air duct 140 and is mainly formed by the left and lower side walls of the housing 120 and the outer wall of the fan chamber 130. In some embodiments, the second space 142 is located in the middle section of the air duct 140 and is mainly formed by the lower side wall of the housing 120 and the outer wall of the fan chamber 130. In some embodiments, the third space 143 is located at the end of the air duct 140 and is mainly formed by the lower and right side walls of the housing 120 and the outer wall of the fan chamber 130. In some embodiments, the second space 142 may be located at the midpoint of the total length of the lower side wall of the housing 120, and the length of the second space 142 along the airflow direction of the air duct 140 may be 1 / 4 to 1 / 3 of the total length of the lower side wall of the housing 120. It should be noted that the two dashed lines in the figure are only approximate spatial divisions and are only used to explain this specification, and do not constitute a limitation of this application. The first space 141 is larger than the second space 142, and the second space 142 is smaller than the third space 143. In some embodiments, from a top-down view, the first space 141, the second space 142, and the third space 143 form a spatial variation of "large-small-large" in terms of cross-sectional area.

[0040] Compared to the second space 142, the first space 141 and the third space 143 have larger top-view cross-sectional areas. Airflow experiences less resistance in spaces with larger top-view cross-sectional areas, and greater resistance in spaces with smaller top-view cross-sectional areas. When airflow flows through the first space 141, the second space 142, and the third space 143, which exhibit a "large-small-large" spatial variation, noise at different frequencies can be reduced, causing the noise during airflow to gradually attenuate. For ease of understanding, this specification refers to the first space 141 and the third space 143, which have larger top-view cross-sectional areas, as large cavities, and the second space 142, which has a smaller top-view cross-sectional area, as small cavities. In some embodiments, the top-view cross-sectional area of ​​the first space 141 can be 1.1 to 5 times that of the second space 142, and the third space 143 can be 1.1 to 5 times that of the second space 142. The fan chamber 130 has at least a first air inlet 131 and a second air inlet 132. The first air inlet 131 is located in a first space 141, and the second air inlet 132 is located in a third space 143. Alternatively, the first air inlet 131 and the second air inlet 132 can be understood as being located within two large cavities. The noise reduction device 100 of this embodiment uses at least two air inlets (the first air inlet 131 and the second air inlet 132) to divert airflow into the fan chamber 130, avoiding the influence of airflow turbulence. This reduces the noise from the airflow entering the fan chamber 130. Furthermore, air inlets at different locations can eliminate noise in different frequency bands, achieving reactive noise reduction. Reactive noise reduction refers to using abrupt changes in the pipe cross-section or connecting a resonant cavity in the pipe to cause changes in impedance during sound wave propagation, resulting in sound energy reflection and interference, thereby reducing the outward radiated sound energy and achieving noise reduction.

[0041] Figure 3 This is a schematic top view of the structure of a noise reduction device (without the top shell) according to other embodiments of this application.

[0042] In some embodiments, see Figure 3 The airway 140 also includes a fourth space 144 and a fifth space 145 in the direction of airflow. Figure 3The air passage 140 is divided into a first space 141, a second space 142, a third space 143, a fourth space 144, and a fifth space 145 along the airflow direction using three dashed lines. It should be noted that these three dashed lines are only approximate spatial divisions and are used solely for illustrative purposes, not to limit the scope of this application. The fourth space 144 is smaller than the third space 143, and the fifth space 145 is larger than the fourth space 144. For further description of the fourth space 144 and the fifth space 145, please refer to the second space 142 and the third space 143 above; they will not be repeated here. In this embodiment, the air passage 140 has a first space 141, a second space 142, a third space 143, a fourth space 144, and a fifth space 145 along the airflow direction. The top-view cross-sectional areas of the second space 142 and the fourth space 144 are relatively small, while the top-view cross-sectional areas of the first space 141, the third space 143, and the fifth space 145 are relatively large. Therefore, the first space 141, the second space 142, the third space 143, the fourth space 144, and the fifth space 145 form a spatial variation of "large-small-large-small-large" in terms of top-view cross-sectional area. Among them, the second space 142 and the fourth space 144, which have smaller top-view cross-sectional areas, are small cavities, while the first space 141, the third space 143, and the fifth space 145, which have larger top-view cross-sectional areas, are large cavities.

[0043] In some embodiments, see Figure 3 The fan chamber 130 also includes a third air inlet 133, which is located in the fifth space 145. That is, the noise reduction device 100 of this embodiment has three air inlets on its fan chamber 130: a first air inlet 131 located in the first space 141, a second air inlet 132 located in the third space 143, and a third air inlet 133 located in the fifth space 145. The noise reduction device 100 of this embodiment uses three air inlets to divert airflow into the fan chamber 130, and the air inlets at different locations can eliminate noise in different frequency bands, further enhancing the noise reduction effect.

[0044] In some embodiments, the air duct 140 may further include a sixth space and a seventh space in the airflow direction (not shown in the schematic diagram of this embodiment). The sixth space is smaller than the fifth space, and the seventh space is larger than the sixth space. In this embodiment, the air duct 140 forms an annular air duct around the fan chamber 130, and the air duct 140 can be divided into seven spaces in the airflow direction, forming a spatial variation of "large-small-large-small-large-small-large". The fan chamber 130 may also include a fourth air inlet, which is located in the seventh space. That is, the noise reduction device 100 of this embodiment has four air inlets on the fan chamber 130, namely the first air inlet 131 located in the first space 141, the second air inlet 132 located in the third space 143, the third air inlet 133 located in the fifth space 145, and the fourth air inlet located in the seventh space. The noise reduction device 100 in this embodiment uses four air inlets to divert air into the fan chamber 130, and the air inlets at different positions can eliminate noise in different frequency bands, further enhancing the noise reduction effect.

[0045] In some embodiments, see Figure 1 The air intake structure includes an air intake pipe 110. The air intake pipe 110 is a hollow pipe structure. In some embodiments, the air intake pipe 110 may be a pipe structure with a circular cross-section. In some embodiments, the air intake pipe 110 may be a pipe structure with a square cross-section. The interior of the air intake pipe 110 may have one or more baffles 111, dividing the air intake pipe 110 into two or more air intake sub-pipes 112. Since airflow is prone to generating eddies when flowing in a circular tubular structure with a large cross-section, which generates more noise, dividing the air intake pipe 110 into multiple air intake sub-pipes 112 can split the airflow into multiple long horizontal flows. Therefore, this structural design of the air intake pipe 110 can reduce the noise generated during airflow.

[0046] In some embodiments, the intake pipe 110 may have a "straight" baffle 111 inside the pipe, dividing the intake pipe 110 into two intake sub-pipes 112. In some embodiments, the intake pipe 110 may have a "cross" baffle 111 inside the pipe, dividing the intake pipe 110 into four intake sub-pipes 112.

[0047] In some embodiments, see Figure 1 The baffle 111 inside the intake pipe 110 can be in the shape of a "well" to divide the intake pipe 110 into nine intake sub-pipes 112.

[0048] In some embodiments, the baffle 111 inside the intake pipe 110 may also be in the shape of "concentric circles", dividing the intake pipe 110 into multiple concentric ring-shaped intake sub-pipes 112.

[0049] In some embodiments, the baffle 111 inside the intake pipe 110 may also be hexagonal honeycomb-shaped, dividing the intake pipe 110 into a plurality of hexagonal honeycomb-shaped intake sub-pipes 112.

[0050] In some embodiments, see Figure 2 and Figure 3 The intake pipe 110 can be horizontally arranged within the housing 120. The dashed line M in the figure represents the centerline of the intake pipe 110 (for example, if the intake pipe 110 is circular, then the dashed line M is the axis of the intake pipe 110). The dashed line N is parallel to the outer wall of the fan chamber 130 located in the first space 141 or parallel to the tangent direction of the outer wall of the fan chamber 130. The angle between the dashed lines M and N is θ. The angle θ is less than 90°, and the first space 141 has an approximately triangular shape when viewed from above. The airflow in the intake pipe 110 flows from the outside to the first space 141 along the dashed line M. The airflow collides with the outer wall of the fan chamber 130 located in the first space 141 and flows towards the second space 142 along the direction of the dashed line N. Therefore, the airflow changes direction within the first space 141, and the changing angle is greater than 90°. In some embodiments, the changing angle of the airflow within the first space 141 is equal to 180° - θ. During airflow transmission, when the airflow changes direction, the sound waves of the airflow will cancel each other out, which can eliminate noise in some frequency bands and thus reduce the noise during airflow transmission.

[0051] It should be noted that the actual airflow direction in the intake pipe 110 and the air passage 140 is quite complex. Figure 2 and Figure 3 The two dashed lines in the diagram are merely for the purpose of facilitating a better understanding of this specification and are intended to explain this specification only. They do not constitute a limitation of this application.

[0052] In some embodiments, see Figures 1-3The end face of the air outlet 113 of the air inlet pipe 110 is perpendicular to the central axis of the air inlet pipe 110. In some embodiments, the bottom surface of the housing 120 is horizontal, and the air inlet pipe 110 is installed parallel to the bottom surface within the housing 120, in which case the end face of the air outlet 113 of the air inlet pipe 110 is perpendicular to the bottom surface of the housing 120. Simultaneously, the side walls (including the inner and outer walls) of the housing 120 and the outer wall of the fan chamber 130 are also perpendicular to the bottom surface of the housing 120. An approximately triangular space is formed between the end face of the air outlet 113 of the air inlet pipe 110, the side walls of the housing 120, and the outer wall of the fan chamber 130. As the airflow exits from the outlet 113 of the inlet pipe 110, it is obstructed by the side wall of the housing 120 and the outer wall of the fan chamber 130. Part of the airflow is diverted to the first inlet 131, while the other part is diverted along the air passage 140 to the second inlet 132 and / or the third inlet 133. In this embodiment, the airflow undergoes at least two flow direction changes within the first space 141. When the airflow changes direction, the sound waves of the airflow will cancel each other out, which can eliminate noise in some frequency bands, thereby reducing the noise during airflow transmission.

[0053] In some embodiments, the space between the end face of the air outlet 113 of the air inlet pipe 110 and the outer wall of the fan chamber 130 is small. When the airflow flows out from the air outlet 113 of the air inlet pipe 110, two directions of diversion and splitting occur rapidly within the small triangular space. The sound waves can partially cancel each other out by rapidly turning within the narrow triangular space, effectively eliminating noise in some frequency bands.

[0054] In some embodiments, the vertical position of the air outlet 113 of the air intake pipe 110 is lower than the vertical position of the first air inlet 131 and the second air inlet 132. See also... Figure 1 The air intake pipe 110 is located near the bottom surface of the housing 120.

[0055] In some embodiments, see Figure 1 The vertical position of the air outlet 113 of the air intake pipe 110 is lower than that of the first air intake 131, the second air intake 132 and the third air intake 133.

[0056] See Figure 1When the vertical height of the outlet 113 of the intake pipe 110 is less than the vertical height of the first intake 131, the second intake 132, and / or the third intake 133, the airflow exiting the outlet 113 of the intake pipe 110 will be obstructed by the side wall of the housing 120 and the outer wall of the fan chamber 130. Part of the airflow will turn upwards towards the first intake 131, while the other part will turn right and flow along the air passage 140 towards the second intake 132 and / or the third intake 133. This structural design allows the airflow to change the direction of the gas sound waves within the space formed between the end face of the outlet 113 of the intake pipe 110, the side wall of the housing 120, and the outer wall of the fan chamber 130, thereby reducing noise through sound wave reflection or interference.

[0057] In some embodiments, a fan 134 is installed inside the fan chamber 130, wherein the base portion of the fan 134 is located in the lower half of the fan chamber 130, and the motor portion of the fan 134 is located in the upper half of the fan chamber 130. The base portion of the fan 134 is used to support and stabilize the motor portion of the fan 134, and can reduce the vibration of the motor portion itself, thereby reducing noise.

[0058] In some embodiments, the first air inlet 131 and the second air inlet 132 are positioned vertically close to the motor portion of the fan 134 within the fan chamber 130, and away from the base portion of the fan 134. When airflow enters the fan chamber 130 through the first air inlet 131 and the second air inlet 132, the airflow flows downwards to cool the motor portion of the fan 134, maintaining the fan 134 within a suitable temperature range and ensuring good operating performance. The airflow ultimately enters the fan 134 through the inlet located below the motor portion.

[0059] In some embodiments, the first air inlet 131, the second air inlet 132, and the third air inlet 133 are positioned vertically close to the motor portion of the fan 134 within the fan chamber 130, and far from the base portion of the fan 134. When airflow enters the fan chamber 130 through the first air inlet 131, the second air inlet 132, and the third air inlet 133, the airflow flows from top to bottom to cool the fan 134, maintaining the fan 134 within a suitable temperature range and ensuring good operating performance.

[0060] Figure 4 This is a schematic perspective view of the noise reduction device (without the top shell) according to some embodiments of this application; Figure 5 This is a three-dimensional structural schematic diagram of a porous sound-absorbing plate in a noise reduction device according to some embodiments of this application; Figure 6 This is a top view of the porous sound-absorbing plate in a noise reduction device according to some embodiments of this application.

[0061] In some embodiments, a porous sound-absorbing plate 150 and / or sound-absorbing cotton are placed in the air duct 140. The porous sound-absorbing plate 150 has a plurality of sound-absorbing holes 154 in the thickness direction to further reduce noise.

[0062] In some embodiments, see Figure 4 A porous sound-absorbing panel 150 can be placed in the air duct 140. See also: [link to embodiments]. Figure 5 The porous sound-absorbing panel 150 may include a porous top plate 151, a porous side plate 152, and a porous bottom plate 153. The porous top plate 151, porous side plate 152, and porous bottom plate 153 are connected to form a three-dimensional enclosed structure. Airflow entering from the intake pipe 110 flows partly into the fan chamber 130 through the first intake port 131, and partly into the space formed by the porous sound-absorbing panel 150 and the outer wall of the fan chamber, and then branches off to the second intake port 132 and / or the third intake port 133 to flow into the fan chamber 130. As the airflow passes through the porous sound-absorbing panel 150, the panel absorbs sound, thereby reducing noise.

[0063] In some embodiments, a porous sound-absorbing plate 150 may also be placed in the air duct 140, and the porous sound-absorbing plate 150 has a plurality of sound-absorbing holes 154 formed in the thickness direction. When the airflow in the air duct 140 flows through the porous sound-absorbing plate 150, at least part of the sound waves of the airflow will enter the sound-absorbing holes 154 to reduce the noise of the airflow.

[0064] The sound-absorbing holes 154 of different diameters on the porous sound-absorbing panel 150 have different effects on eliminating airflow noise in different frequency ranges. The sound-absorbing holes 154 with smaller diameters are suitable for eliminating high-frequency noise, while the sound-absorbing holes 154 with larger diameters are suitable for eliminating low-frequency noise. Based on this, in some embodiments, the porous sound-absorbing panel 150 may include multiple regions, and the diameter of the sound-absorbing holes 154 in each region is set according to a preset rule. The sound-absorbing holes 154 with multiple diameters can eliminate airflow noise in different frequency ranges, thereby effectively ensuring the noise reduction effect of the noise reduction structure.

[0065] In some embodiments, see Figure 5 The porous sound-absorbing panel 150 may include a porous top plate 151, a porous side plate 152, and a porous bottom plate 153. The porous top plate 151, porous side plate 152, and porous bottom plate 153 are connected to form a three-dimensional enclosing structure. Gas entering from the air inlet pipe 110 forms an airflow within the air passage 140. As the airflow passes through the porous sound-absorbing panel 150, the plurality of sound-absorbing holes 154 can absorb sound, thereby reducing noise. In some embodiments, the diameter of the sound-absorbing holes 154 in the porous top plate 151, porous side plate 152, and porous bottom plate 153 may be the same.

[0066] In some embodiments, the apertures of the sound-absorbing holes 154 on the porous top plate 151, porous side plate 152, and porous bottom plate 153 may also be different. In some embodiments, the aperture of the sound-absorbing holes 154 on the porous side plate 152 may be larger than the aperture of the sound-absorbing holes 154 on the porous top plate 151 and / or the porous side plate 152. In some embodiments, the aperture of the sound-absorbing holes 154 on the porous top plate 161 may be smaller than the aperture of the sound-absorbing holes 154 on the porous bottom plate 153.

[0067] In some embodiments, the porous top plate 151, porous side plate 152, or porous bottom plate 153 may each be divided into multiple regions, and the aperture of the sound-absorbing hole 154 in each region is set to a set value according to the actual noise reduction target frequency band.

[0068] In some embodiments, the multiple regions of the porous sound-absorbing panel 150 can be spatially divided into multiple regions in the vertical direction along the airflow direction within the porous sound-absorbing panel 150. Each region includes a porous top plate 151, a porous side plate 152, and a porous bottom plate 153.

[0069] In some embodiments, see Figure 6 The porous sound-absorbing panel 150 may include three regions: a first region 155, a second region 156, and a third region 157. The apertures of the sound-absorbing holes 154 in the first region 155, the second region 156, and the third region 157 are set according to a preset rule. In some embodiments, the apertures of the sound-absorbing holes 154 in the first region 155, the second region 156, and the third region 157 may be the same.

[0070] In some embodiments, the apertures of the sound-absorbing holes 154 in the first region 155, the second region 156, and the third region 157 may also be different. In some embodiments, the aperture of the sound-absorbing hole 154 in the second region 156 may be larger than the aperture of the sound-absorbing hole 154 in the first region 155 and / or the third region 157. In some embodiments, the aperture of the sound-absorbing hole 154 in the first region 155 may be larger than the aperture of the sound-absorbing hole 154 in the third region 157. In some embodiments, the porous sound-absorbing panel 150 may also include three or more regions (e.g., four, five, six, etc.), each region having a different aperture size for the sound-absorbing hole 154.

[0071] In some embodiments, the aperture size of the sound-absorbing holes 154 in each region can be designed according to the noise frequency band of the airflow passing through the porous sound-absorbing plate 150.

[0072] In some embodiments, the porous sound-absorbing plate 150 may also have sound-absorbing holes 154 of different sizes distributed irregularly in different areas.

[0073] In some embodiments, the thickness of the porous sound-absorbing panel 150 can be 1.5 mm, and the aperture of the sound-absorbing holes 154 of the porous sound-absorbing panel 150 can be less than or equal to the thickness of the porous sound-absorbing panel 150. In some embodiments, the porous sound-absorbing panel 150 is provided with sound-absorbing holes 154 of various aperture sizes. In some embodiments, the aperture of the sound-absorbing holes 154 of the porous sound-absorbing panel 150 can be various sizes such as 0.6 mm, 0.9 mm, 1.0 mm, 1.2 mm, and 1.5 mm.

[0074] In some embodiments, sound-absorbing cotton (not shown in the accompanying drawings) may be placed in the air duct 140. The sound-absorbing cotton may be attached to the inner wall (including the side walls, top surface, and bottom surface) of the housing 120 and / or the outer wall of the fan chamber 130. When airflow flows in the air duct 140, the sound-absorbing cotton disposed around the air duct 140 can absorb the noise generated by the airflow.

[0075] In some embodiments, the sound-absorbing cotton can be non-porous sound-absorbing cotton. The non-porous sound-absorbing cotton is placed around the air duct 140. When the airflow flows through the air duct 140, the non-porous sound-absorbing cotton can not only absorb some noise, but also reflect sound waves. The reflected sound waves will be absorbed and weakened again by the non-porous sound-absorbing cotton in other directions, resulting in a better noise reduction effect.

[0076] In some embodiments, a porous sound-absorbing panel 150 and sound-absorbing cotton may be placed in the air duct 140. See also Figure 4 and Figure 5 Sound-absorbing cotton is placed in the space formed between the inner wall of the housing 120 and the outer wall of the porous sound-absorbing panel 150. The inner and outer walls of the sound-absorbing cotton are respectively attached to the outer wall of the porous sound-absorbing panel 150 and the inner wall of the housing 120. When the airflow flows in the air passage 140, the porous sound-absorbing panel 150 can absorb a portion of the sound waves (i.e., noise) of the airflow. Some sound waves will pass through the multiple sound-absorbing holes of the porous sound-absorbing panel 150 and be absorbed by the sound-absorbing cotton, resulting in better noise reduction.

[0077] In some embodiments, the noise reduction device 100 further includes a gas outlet (not shown in the figure), which is connected to a water tank or a coverless airway located downstream of the air passage of the noise reduction device 100 inside the ventilator. This gas outlet is used to transmit pressurized gas and ultimately connects to an external breathing mask. The gas, pressurized by the fan, can be used to replace, control, or alter the body's spontaneous breathing movements. In some embodiments, the gas outlet is connected to the water tank or coverless airway inside the ventilator via a seal, effectively preventing air leakage at the connection point.

[0078] This specification also provides a ventilator in which the noise reduction device described in any of the above embodiments is installed to reduce noise during use.

[0079] The beneficial effects that the embodiments of this specification may bring include, but are not limited to: (1) The air duct adopts a design with alternating large and small cavities. When the airflow flows through the various spaces with different cross-sectional areas in the air duct, it can absorb noise of different frequencies, so that the noise during airflow gradually decreases; (2) Using at least two air inlets to divert air into the fan chamber reduces the influence of airflow turbulence and can weaken the noise of airflow entering the fan chamber. Moreover, air inlets at different positions can eliminate noise of different frequency bands; (3) Dividing the air inlet pipe into multiple air inlet sub-pipes can divert the airflow into multiple long horizontal flows. This structural design can reduce the airflow noise. (4) When air enters the first space from the air inlet pipe, the airflow turns at an angle greater than 90° in the first space. When the airflow changes direction, the sound waves of the airflow will cancel each other out, which can eliminate noise in some frequency bands and thus reduce the noise during airflow transmission; (5) At least two inlets are positioned vertically close to the motor part of the fan 134 in the fan chamber. The airflow flows from top to bottom to cool the fan, so that the fan is kept in a suitable temperature range and maintains good working performance; (6) Porous sound-absorbing panels and / or sound-absorbing cotton are placed in the air duct to further reduce noise. It should be noted that different embodiments may produce different beneficial effects. In different embodiments, the beneficial effects that may be produced can be any one or a combination of the above, or any other possible beneficial effects.

[0080] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0081] Furthermore, this specification uses specific terms to describe embodiments thereof. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Moreover, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0082] Similarly, it should be noted that, in order to simplify the description disclosed herein and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of embodiments in this specification may sometimes combine multiple features into a single embodiment, drawing, or description thereof. However, this method of disclosure does not imply that the subject matter of this specification requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of a single embodiment disclosed above.

[0083] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A noise reduction device, characterized in that, The noise reduction device (100) includes an air intake structure, a housing (120), a fan chamber (130), and an air duct (140); the air duct (140) is located between the inner wall of the housing (120) and the outer wall of the fan chamber (130); the air duct (140) is used to transmit airflow; the fan chamber (130) is provided with at least two air inlets along the direction of airflow; gas enters the air duct (140) through the air intake structure, and then enters the fan chamber (130) through the at least two air inlets; the air duct (140) has at least three spaces along the direction of airflow, the space near the beginning of the air duct along the direction of airflow is a large cavity, and each space is distributed in a large cavity and a small cavity in sequence, and the at least two air inlets are respectively arranged in different large cavities adjacent to the small cavity.

2. The noise reduction device according to claim 1, characterized in that, The air passage (140) has at least a first space (141), a second space (142), and a third space (143) in the direction of airflow; the first space (141) is larger than the second space (142), and the second space (142) is smaller than the third space (143); the fan chamber (130) has at least a first air inlet (131) and a second air inlet (132), the first air inlet (131) being located in the first space (141), and the second air inlet (132) being located in the third space (143).

3. The noise reduction device according to claim 2, characterized in that, The air passage (140) further includes a fourth space (144) and a fifth space (145) in the direction of airflow; the fourth space (144) is smaller than the third space (143), and the fifth space (145) is larger than the fourth space (144); the fan chamber (130) further includes a third air inlet (133), which is located in the fifth space (145).

4. The noise reduction device according to claim 1, characterized in that, The air intake structure includes an air intake pipe (110); the air intake pipe (110) has one or more baffles (111) inside the pipe, which divide the air intake pipe (110) into two or more air intake sub-pipes (112).

5. The noise reduction device according to claim 4, characterized in that, The partition (111) is in the shape of a "well" and divides the air intake pipe (110) into nine air intake sub-pipes (112).

6. The noise reduction device according to claim 1, characterized in that, The air intake structure includes an air intake pipe (110); the angle between the center line of the air intake pipe (110) and the outer wall of the fan chamber (130) is less than 90°.

7. The noise reduction device according to claim 1, characterized in that, The at least two air inlets are positioned vertically close to the motor portion of the fan in the fan chamber (130), so that the airflow enters the fan chamber (130) through the at least two air inlets and cools the fan (134).

8. The noise reduction device according to claim 1, characterized in that, A porous sound-absorbing plate (150) and / or sound-absorbing cotton are placed in the air passage (140); the porous sound-absorbing plate (150) has a plurality of sound-absorbing holes (154) in the thickness direction.

9. The noise reduction device as described in claim 8, characterized in that, The porous sound-absorbing panel (150) includes multiple regions, and the aperture of the sound-absorbing holes (154) in each region is set according to a preset rule.

10. The noise reduction device according to claim 9, characterized in that, The porous sound-absorbing panel (150) includes a porous top plate (151), a porous side plate (152), and a porous bottom plate (153); the porous sound-absorbing panel (150) has a plurality of sound-absorbing holes (154) in the thickness direction; the diameter of the sound-absorbing holes (154) on the porous top plate (151), the porous side plate (152), and / or the porous bottom plate (153) is set according to a preset rule.

11. The noise reduction device according to claim 8, characterized in that, The sound-absorbing cotton is non-porous sound-absorbing cotton.

12. The noise reduction device according to claim 1, characterized in that, The vertical position of the air outlet (113) of the air intake structure is less than that of the vertical position of the at least two air inlets.

13. A ventilator, characterized in that: Includes the noise reduction device according to any one of claims 1-12.

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