Noise reduction device and ventilator

Abstract

Embodiments of the present invention provide a noise reduction device and a ventilator, which relate to the field of medical devices. The noise reduction device can be installed at the air inlet of the turbine fan of the ventilator, and the air outlet hole is communicated with the air inlet of the turbine fan. The noise reduction device includes a plate body, a plurality of annular protrusions and a bottom cover. The plate body is provided with an air outlet hole and a plurality of air inlet holes. The plurality of annular protrusions are respectively arranged at the plurality of air inlet holes, and the annular protrusions surround the air inlet holes. The inner wall of the annular protrusion defines an air inlet flow channel. The bottom cover is installed on the plate body to jointly define an air outlet chamber. The plurality of annular protrusions are located in the air outlet chamber. The air inlet holes, the air inlet flow channel, the air outlet chamber and the air outlet hole are sequentially communicated, which reduces the magnitude of the noise passing through the air inlet holes, thereby reducing the overall noise of the ventilator and improving the noise reduction effect on the ventilator.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and more particularly, to a noise reduction device and a ventilator. Background Art

[0002] As a medical device that can replace or assist patients in mechanical ventilation, a ventilator is a device that can improve respiratory function, reduce the consumption of respiratory work, and save cardiac reserve capacity, and is mainly used in families, sleep treatment centers, and some clinics and hospitals.

[0003] Since the turbine fan of the ventilator generates operating noise during operation, which will affect the comfort of patients during use, it is necessary to reduce the noise of the ventilator. However, the noise reduction effect of the existing ventilators is not good. Summary of the Invention

[0004] The present invention provides a noise reduction device and a ventilator, which can improve the noise reduction effect of the ventilator.

[0005] Embodiments of the present invention may be implemented as follows:

[0006] An embodiment of the present invention provides a noise reduction device, which includes:

[0007] A plate body, on which an air outlet hole and a plurality of air inlet holes are provided;

[0008] A plurality of annular protrusions, which are respectively arranged at the plurality of air inlet holes, and the annular protrusions surround the air inlet holes, and the inner wall of the annular protrusions defines an air inlet flow channel; and

[0009] A bottom cover, which is installed on the plate body to jointly define an air outlet chamber, the plurality of annular protrusions are located in the air outlet chamber, and the air inlet holes, the air inlet flow channel, the air outlet chamber, and the air outlet hole are sequentially communicated.

[0010] Optionally, the noise reduction device further includes a top cover, which is installed on the side of the plate body away from the bottom cover, and the top cover and the plate body jointly define an air inlet chamber;

[0011] The top cover is provided with an air inlet and an air outlet, and the air inlet, the air inlet hole, the air inlet flow channel, the air outlet chamber, the air outlet hole, and the air outlet are sequentially communicated.

[0012] Optionally, the air inlet is arranged at the edge of the top cover, and the number of the air inlets is multiple, and the multiple air inlets are arranged at intervals.

[0013] Optionally, a flexible protrusion is provided on the side of the top cover away from the plate body, and the flexible protrusion is used to abut against the installation shell;

[0014] The number of the flexible protrusions is multiple, and the multiple flexible protrusions are distributed around the central axis of the air outlet.

[0015] Optionally, the noise reduction device further includes a mounting housing and a hollow joint. The mounting housing is provided with a channel hole. The inner wall of the hollow joint defines an air inlet channel. The hollow joint penetrates through the air inlet, and the outer wall of the hollow joint is sealingly abutted against the inner wall of the air inlet. The channel hole, the air inlet channel and the air outlet hole are communicated.

[0016] The mounting housing is elastically abutted against the flexible protrusions. The mounting housing is used for connecting a turbine fan. The mounting housing is provided with a mating cylinder. The bottom cover is provided with a hollow column. The plate body is provided with a first mating opening. The top cover is provided with a second mating opening. The first mating opening and the second mating opening are sequentially clamped on the outer wall of the hollow column. The mating cylinder penetrates through the hollow column.

[0017] Optionally, the edge of the first mating opening is provided with an air inlet partition plate, and the air inlet partition plate is abutted against the side of the top cover away from the mounting housing.

[0018] Optionally, the noise reduction device further includes a plurality of air outlet partition plates. The plurality of air outlet partition plates are connected to the side wall of the plate body. The plurality of air outlet partition plates are arranged at intervals to divide the air outlet chamber into a plurality of air outlet channels. The plurality of annular protrusions are distributed in the plurality of air outlet channels.

[0019] Optionally, the plurality of air outlet partition plates are arranged around the central axis of the air outlet hole, and the plurality of annular protrusions are uniformly distributed in the plurality of air outlet channels.

[0020] Optionally, the height of at least one of the annular protrusions is greater than the height of another part of the annular protrusions.

[0021] An embodiment of the present invention further provides a ventilator, which includes a turbine fan and the above-mentioned noise reduction device. The noise reduction device is installed at the air flow inlet of the turbine fan, and the air outlet hole is communicated with the air flow inlet of the turbine fan.

[0022] The beneficial effects of the noise reduction device and the ventilator according to the embodiments of the present invention include, for example:

[0023] An embodiment of the present invention provides a noise reduction device. This noise reduction device can be installed at the air inlet of the turbine fan of a ventilator, and the air outlet hole is communicated with the air inlet of the turbine fan. The noise reduction device includes a plate body, a plurality of annular protrusions, and a bottom cover. The plate body is provided with an air outlet hole and a plurality of air inlet holes. The plurality of annular protrusions are respectively arranged at the plurality of air inlet holes, and the annular protrusions surround the air inlet holes. The inner wall of the annular protrusion defines an air inlet flow channel. The bottom cover is installed on the plate body to jointly define an air outlet chamber. The plurality of annular protrusions are located in the air outlet chamber. The air inlet holes, the air inlet flow channels, the air outlet chamber, and the air outlet hole are sequentially communicated. Noise is transmitted from the air inlet of the turbine fan. The noise enters the air outlet chamber from the air outlet hole, and then enters the air inlet flow channels of the plurality of annular protrusions. The inner wall of the annular protrusion can repeatedly reflect and absorb the noise, reducing the magnitude of the noise passing through the air inlet holes, thereby reducing the overall noise of the ventilator and improving the noise reduction effect of the ventilator.

[0024] An embodiment of the present invention further provides a ventilator, including a turbine fan and the above-mentioned noise reduction device. The noise reduction device is installed at the air inlet of the turbine fan, and the air outlet hole is communicated with the air inlet of the turbine fan, which can reduce the overall noise of the ventilator and improve the noise reduction effect of the ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 Schematic diagram of the turbine fan provided in the embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the noise reduction device provided in the embodiment of the present invention;

[0028] Figure 3 Exploded view of the noise reduction device provided in the embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the air outlet partition provided in the embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the air inlet partition provided in the embodiment of the present invention;

[0031] Figure 6 Partial cross-sectional view of the noise reduction device provided in the embodiment of the present invention.

[0032] Icons: 1000 - noise reduction device; 100 - plate body; 101 - air outlet hole; 102 - air inlet hole; 103 - first mating opening; 200 - annular protrusion; 201 - air inlet flow channel; 300 - bottom cover; 301 - air outlet chamber; 302 - hollow column; 400 - top cover; 401 - air inlet chamber; 402 - air inlet; 403 - air outlet; 404 - second mating opening; 500 - flexible protrusion; 600 - mounting housing; 601 - channel hole; 610 - mating column; 700 - hollow connector; 701 - air inlet channel; 800 - air outlet partition; 801 - air outlet flow channel; 900 - air inlet partition; 901 - air inlet channel; 2000 - turbine fan; 2001 - air flow inlet; 3000 - fan housing. Detailed implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0039] A ventilator, as a medical device that can replace or assist a patient in completing mechanical ventilation, is a device that can improve respiratory function, reduce the consumption of respiratory work, and save the heart's reserve capacity. It is mainly used in families, sleep therapy centers, and some clinics and hospitals.

[0040] Since the turbine fan of the ventilator generates operating noise during operation, which will affect the comfort of the patient during use, it is necessary to reduce the noise of the ventilator. Generally speaking, after the noise of the turbine fan of the ventilator is transmitted, it is mainly conducted to the outside through the fan housing. For example, the most important measure for reducing the noise of the turbine fan is to use a soft silicone pad to achieve shock absorption of the turbine fan, and use a soft silicone cushion to absorb the vibration generated by the fan during high-speed operation, avoiding the vibration of the turbine fan being transmitted to the fan housing to cause resonance. At the same time, sound-absorbing cotton is used in the air duct to achieve noise reduction, but the noise reduction effect of the ventilator in the prior art is still not good.

[0041] In view of this, please refer to Figures 1 - 6 , the noise reduction device 1000 and the ventilator provided in the embodiments of the present invention can solve this problem, and will be described in detail below.

[0042] Please refer to Figure 1 , the embodiments of the present invention provide a ventilator, which includes a turbine fan 2000, a fan housing 3000, and a noise reduction device 1000. Among them, Figure 1 The arrow in indicates the path of air entering the turbine fan 2000, and the propagation direction of the noise is opposite to the path direction of the air entering the turbine fan 2000. The noise reduction device 1000 is installed at the air inlet 2001 of the turbine fan 2000, which can reduce the overall noise of the ventilator. The noise reduction device 1000 and the turbine fan 2000 are both installed in the fan housing 3000, and the noise reduction device 1000 can improve the noise reduction effect of the ventilator.

[0043] It is easy to understand that the ventilator also includes devices such as an air source, a gas supply device, and a mixed air device. The specific principle of the ventilator can refer to the ventilator in the prior art, which will not be elaborated here.

[0044] Please refer to Figures 2 - 6 , where, for the convenience of description, Figure 2 , Figure 3 and Figure 6The installation housing 600 is hidden to facilitate a detailed description of the noise reduction device 1000 that follows. The noise reduction device 1000 includes a plate body 100, a plurality of annular protrusions 200, and a bottom cover 300. The plate body 100 is provided with an air outlet hole 101 and a plurality of air inlet holes 102. The air outlet hole 101 is communicated with the air flow inlet 2001 of the turbine fan 2000. The plurality of annular protrusions 200 are respectively arranged at the plurality of air inlet holes 102, and the annular protrusions 200 surround the air inlet holes 102. The inner wall of the annular protrusion 200 defines an air inlet flow channel 201. In this embodiment, the number of the annular protrusions 200 is thirty. The structure of the annular protrusion 200 is a hollow cylinder, and the axis line of the annular protrusion 200 is perpendicular to the plate body 100.

[0045] Among them, the bottom cover 300 is installed on the plate body 100. The bottom cover 300 and the plate body 100 jointly define an air outlet chamber 301. All the annular protrusions 200 are located in the air outlet chamber 301, and the air inlet holes 102, the air inlet flow channel 201, the air outlet chamber 301, and the air outlet hole 101 are communicated in sequence. Air enters from the air inlet holes 102 and finally flows out from the air outlet hole 101 and enters the interior of the turbine fan 2000.

[0046] Noise is transmitted from the air inlet 402 of the turbine fan 2000. The noise enters the air outlet chamber 301 from the air outlet hole 101, and then enters the air inlet flow channel 201 of the plurality of annular protrusions 200. The inner wall of the annular protrusion 200 can repeatedly reflect and absorb the noise, reducing the magnitude of the noise passing through the air inlet holes 102, thereby reducing the overall noise of the ventilator and improving the noise reduction effect of the ventilator.

[0047] It is easy to understand that the noise in this application is noise in the form of sound waves. The main sources of the noise transmitted from the air flow inlet 2001 of the turbine fan 2000 are the noise generated by the turbine fan blades in the turbine fan 2000 disturbing the air flow and the internal mechanical noise of the turbine fan 2000. Thereby, the noise reduction effect on the turbine fan 2000 is enhanced, the noise reduction effect of the ventilator is improved, and the comfort of the patient is enhanced.

[0048] For the convenience of air intake, the noise reduction device 1000 further includes a top cover 400. The top cover 400 is installed on the side of the plate body 100 away from the bottom cover 300. The top cover 400 and the plate body 100 jointly define an air intake chamber 401. The top cover 400 is provided with an air intake port 402 and an air outlet 403. The air intake port 402, the air intake hole 102, the air intake flow channel 201, the air outlet chamber 301, the air outlet hole 101, and the air outlet 403 are communicated in sequence. The air intake port 402 is arranged at the edge of the top cover 400, and the number of the air intake ports 402 is multiple. The multiple air intake ports 402 are arranged at intervals. Specifically, the number of the air intake ports 402 is three, and the air intake ports 402 are arc-shaped openings. Air enters the air intake chamber 401 from the three air intake ports 402, and then enters the air intake hole 102.

[0049] It should be noted that, for the convenience of the installation and connection among the top cover 400, the plate body 100, and the bottom cover 300, the bottom cover 300 is provided with a hollow column 302, the plate body 100 is provided with a first mating opening 103, and the top cover 400 is provided with a second mating opening 404. The first mating opening 103 and the second mating opening 404 are sequentially clamped on the outer wall of the hollow column 302. Specifically, both the first mating opening 103 and the second mating opening 404 are circular arc-shaped openings, and the inner walls of the first mating opening 103 and the second mating opening 404 are both in close contact with the outer wall of the hollow column 302.

[0050] In order to install the top cover 400 at the air inlet 2001 of the turbine fan 2000 and ensure that all air passes through the annular protrusion 200 to improve the sealing performance, the noise reduction device 1000 further includes an installation shell 600 and a hollow joint 700. The hollow joint 700 is a soft joint made of silica gel, and the structure of the hollow joint 700 is similar to that of a corrugated pipe.

[0051] The installation shell 600 is provided with a channel hole 601. The inner wall of the hollow joint 700 defines an air intake channel 701. The hollow joint 700 penetrates through the air intake port 402 of the top cover 400, and the outer wall of the hollow joint 700 is hermetically abutted against the inner wall of the air intake port 402. The channel hole 601, the air intake channel 701, and the air outlet hole 101 are communicated. Specifically, in this embodiment, one end of the hollow joint 700 is hermetically abutted against the air inlet 2001 of the turbine fan 2000, and the other end of the hollow joint 700 is hermetically connected to the air outlet hole 101.

[0052] Among them, the installation shell 600 is fixedly connected to the turbine fan 2000, and the installation shell 600 is provided with a mating cylinder 610. The mating cylinder 610 penetrates through the hollow column 302 and is connected to the hollow column 302. Specifically, the number of the mating cylinders 610 is three, and the three mating cylinders 610 respectively penetrate through the three hollow columns 302.

[0053] To avoid the influence of the vibration of the turbine fan 2000 on the noise reduction device 1000, a flexible protrusion 500 is provided on the side of the top cover 400 away from the plate body 100. The number of flexible protrusions 500 is multiple, and the multiple flexible protrusions 500 are distributed around the center line of the air outlet 403. The installation shell 600 is elastically abutted against the flexible protrusion 500, which can reduce the contact area between the top cover 400 and the installation shell 600. At the same time, the flexible protrusion 500 can also reduce the vibration of the top cover 400, further reducing the generation of noise.

[0054] In order to perform multiple noise reductions on the noise and minimize the noise as much as possible, the noise reduction device 1000 further includes a plurality of air outlet partitions 800, specifically nine air outlet partitions 800. The nine air outlet partitions 800 are connected to the side wall of the plate body 100. The plate body 100 is similar to a disc structure. The air outlet partitions 800 extend along the radial direction of the plate body 100, and the nine air outlet partitions 800 are arranged around the center line of the air outlet hole 101. The nine air outlet partitions 800 can be arranged at intervals to divide the air outlet chamber 301 into eight air flow channels 801.

[0055] In this embodiment, the ends of two adjacent air outlet partitions 800 near both sides of the first mating opening 103 are connected. Therefore, the nine air outlet partitions 800 divide the air chamber into six air flow channels 801, and the air inlet channel 201, the air flow channels 801, and the air outlet hole 101 are communicated in sequence.

[0056] When the noise coming out of the air outlet hole 101 passes through the six air flow channels 801, it will first be reflected and absorbed between the adjacent air outlet partitions 800. Finally, the noise decays, and then the noise enters the inner wall of the annular protrusion 200, where it is repeatedly reflected and absorbed again to reduce the noise.

[0057] It should be noted that thirty annular protrusions 200 are evenly distributed in the six air flow channels 801, and five annular protrusions 200 are distributed in each air flow channel 801. Of course, in other embodiments, the number of annular protrusions 200 in adjacent air flow channels 801 can also be different. For example, one air flow channel 801 has four annular protrusions 200, and another air flow channel 801 has six annular protrusions 200. The number is not limited here.

[0058] Since the noise generated by the turbine fan is broadband noise, in order to absorb noises of different frequencies, among the multiple annular protrusions 200 located in the air outlet flow channel 801, the height of at least one annular protrusion 200 can be greater than the height of another part of the annular protrusions 200. Specifically, among the five annular protrusions 200, the height of one of the annular protrusions 200 is greater than the height of the other four annular protrusions 200. The heights of the other four annular protrusions 200 can be equal, or the heights among the four annular protrusions 200 can be different, or the heights of the five annular protrusions 200 can all be different, so as to absorb noises of different frequencies.

[0059] In addition, a plurality of air intake partition plates 900 are provided at the edge of the first mating opening 103, specifically six air intake partition plates 900. The six air intake partition plates 900 are in contact with the side of the top cover 400 away from the mounting housing 600. The six air intake partition plates 900 are evenly distributed on both sides of the first mating opening 103. Among them, the adjacent air intake partition plates 900 distributed on both sides of the air intake hole 102 define an air intake channel 901, and the air intake port 402, the air intake channel 901, and the air intake hole 102 are communicated in sequence.

[0060] It is easy to understand that the noise transmitted from the turbine fan 2000 will first be reflected and absorbed between the adjacent air outlet partition plates 800 for noise attenuation, and then the noise enters the inner wall of the annular protrusion 200, where the noise is reflected and absorbed repeatedly again to reduce the noise. Finally, the noise is reflected and absorbed between the adjacent air intake partition plates 900 for noise attenuation, and then the noise is transmitted out of the muffler from the three air intake ports 402. After multiple noise reduction processes on the noise, the overall noise of the ventilator is greatly reduced.

[0061] In summary, the noise reduction device 1000 can be installed at the air inlet 2001 of the turbine fan 2000 of the ventilator. The air outlet hole 101 communicates with the air inlet 402 of the turbine fan 2000. The noise reduction device 1000 includes a plate body 100, a plurality of annular protrusions 200, and a bottom cover 300. The plate body 100 is provided with an air outlet hole 101 and a plurality of air inlet holes 102. The plurality of annular protrusions 200 are respectively arranged at the plurality of air inlet holes 102, and the annular protrusions 200 surround the air inlet holes 102. The inner wall of the annular protrusion 200 defines an air inlet flow channel 201. The bottom cover 300 is installed on the plate body 100 to jointly define an air outlet chamber 301. The plurality of annular protrusions 200 are located in the air outlet chamber 301. The air inlet holes 102, the air inlet flow channel 201, the air outlet chamber 301, and the air outlet hole 101 are connected in sequence. Noise is transmitted from the air inlet 402 of the turbine fan 2000. The noise enters the air outlet chamber 301 from the air outlet hole 101, and then enters the air inlet flow channel 201 of the plurality of annular protrusions 200. The inner wall of the annular protrusion 200 can repeatedly reflect and absorb the noise, reducing the magnitude of the noise passing through the air inlet holes 102, thereby reducing the overall noise of the ventilator and improving the noise reduction effect of the ventilator.

[0062] The ventilator includes a turbine fan 2000 and the above-mentioned noise reduction device 1000. The noise reduction device 1000 is installed at the air inlet 2001 of the turbine fan 2000. The air outlet hole 101 communicates with the air inlet 2001 of the turbine fan 2000, which can reduce the overall noise of the ventilator and improve the noise reduction effect of the ventilator.

[0063] As described above, the above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A noise reduction device, characterized in that, Comprising: A plate body (100) provided with an air outlet hole (101) and a plurality of air inlet holes (102); A plurality of annular protrusions (200) respectively arranged at the plurality of air inlet holes (102), and the annular protrusions (200) surround the air inlet holes (102), and the inner wall of the annular protrusions (200) defines an air inlet flow channel (201); and A bottom cover (300) installed on the plate body (100) to jointly define an air outlet chamber (301), the plurality of annular protrusions (200) are located in the air outlet chamber (301), and the air inlet holes (102), the air inlet flow channel (201), the air outlet chamber (301) and the air outlet hole (101) are communicated in sequence; The noise reduction device further includes a top cover (400) installed on a side of the plate body (100) away from the bottom cover (300), and the top cover (400) and the plate body (100) jointly define an air inlet chamber (401); The top cover (400) is provided with an air inlet (402) and an air outlet (403), and the air inlet (402), the air inlet hole (102), the air inlet flow channel (201), the air outlet chamber (301), the air outlet hole (101) and the air outlet (403) are communicated in sequence; The air inlet (402) is arranged at the edge of the top cover (400), and the number of the air inlets (402) is multiple, and the multiple air inlets (402) are arranged at intervals; A flexible protrusion (500) is arranged on a side of the top cover (400) away from the plate body (100), and the flexible protrusion (500) is used for abutting against the installation shell (600); The number of the flexible protrusions (500) is multiple, and the multiple flexible protrusions (500) are distributed around the center line of the air outlet (403); The noise reduction device further includes an installation shell (600) and a hollow joint (700), the installation shell (600) is provided with a channel hole (601), the inner wall of the hollow joint (700) defines an air inlet channel (701), the hollow joint (700) penetrates through the air inlet (402), and the outer wall of the hollow joint (700) is hermetically abutted against the inner wall of the air inlet (402), and the channel hole (601), the air inlet channel (701) and the air outlet hole (101) are communicated; The installation housing (600) and the flexible protrusion (500) are elastically abutted. The installation housing (600) is used to connect the turbine fan (2000). A mating cylinder (610) is provided on the installation housing (600). A hollow cylinder (302) is provided on the bottom cover (300). A first mating opening (103) is provided on the plate body (100). A second mating opening (404) is provided on the top cover (400). The first mating opening (103) and the second mating opening (404) are sequentially clamped on the outer wall of the hollow cylinder (302). The mating cylinder (610) penetrates through the hollow cylinder (302).

2. The noise reduction device according to claim 1, wherein, An air intake partition (900) is provided at the edge of the first mating opening (103). The air intake partition (900) abuts against the side of the top cover (400) away from the installation housing (600).

3. The noise reduction device according to claim 1, wherein The noise reduction device further includes a plurality of air outlet partitions (800). The plurality of air outlet partitions (800) are connected to the side wall of the plate body (100). The plurality of air outlet partitions (800) are arranged at intervals to divide the air outlet chamber (301) into a plurality of air outlet channels (801). The plurality of annular protrusions (200) are distributed in the plurality of air outlet channels (801).

4. The noise reduction device according to claim 3, wherein, The plurality of air outlet partitions (800) are arranged around the center line of the air outlet hole (101). The plurality of annular protrusions (200) are evenly distributed in the plurality of air outlet channels (801).

5. The noise reduction device according to claim 1, characterized in that The height of at least one of the annular protrusions (200) is greater than the height of another part of the annular protrusions (200).

6. A ventilator, characterized in that, It includes a turbine fan (2000) and the noise reduction device according to any one of claims 1-5. The noise reduction device is installed at the air inlet (2001) of the turbine fan (2000). The air outlet hole (101) is communicated with the air inlet (2001) of the turbine fan (2000).

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