Respirator noise reduction device and respirator

Abstract

The utility model is applicable to the technical field of breathing machines, and provides a breathing machine noise reduction device and a breathing machine, the breathing machine noise reduction device comprises: a housing in which an air duct communicated with the outside is arranged; the fan is mounted on the shell, and an air inlet of the fan is communicated with the air duct; the isolation shell is arranged outside the air duct and close to the air duct, a sound absorption cavity is formed in the isolation shell, the sound absorption cavity is filled with a sound absorption material, and a plurality of through holes communicating the sound absorption cavity with the air duct are formed in the side face, close to the air duct, of the isolation shell. According to the noise reduction device of the breathing machine, at least one isolation shell is arranged, airflow energy is absorbed through the multiple through holes in the isolation shell and the sound absorption materials in the sound absorption cavity, the sound absorption cavity and the air channel form a resonance noise reduction cavity through the multiple through holes, the air flow speed in the air channel is reduced, and the perforated plate type noise reduction effect is achieved; and a good noise reduction effect of the breathing machine is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilators, in particular to a ventilator noise reduction device and a ventilator. Background Art

[0002] As a device with artificial ventilation function, ventilator has been widely used in the treatment of respiratory failure caused by various reasons, sleep apnea hypopnea syndrome and other diseases, and it occupies a very important position in the field of modern medicine. As people pay more attention to respiratory treatment, the performance requirements of ventilators are getting higher and higher. Among them, the indicator that users can easily perceive is noise. Noise directly affects whether users can fall asleep, especially when they first use it. It can be used as a basis for judging whether users are willing to accept long-term non-invasive and non-respiratory treatment.

[0003] In the prior art, ventilators mainly achieve noise reduction by installing sound-absorbing cotton in the internal air duct. However, using simple sound-insulating cotton for sound insulation, sound absorption and shock absorption cannot achieve the ideal noise reduction effect. The noise reduction effect is poor, resulting in excessive noise when the ventilator is in use, seriously affecting the sleep quality of patients and their families, and poor user experience. Utility Model Content

[0004] The utility model provides a ventilator noise reduction device, aiming to solve the problems of poor noise reduction effect and poor user experience of the ventilator in the prior art.

[0005] The utility model is implemented by providing a ventilator noise reduction device, comprising:

[0006] A shell, wherein an air duct communicating with the outside is provided in the shell;

[0007] A fan installed on the housing, wherein an air inlet of the fan is connected to the air duct; and

[0008] At least one isolation shell is arranged outside the air duct and close to the air duct, a sound absorption cavity is arranged in the isolation shell, the sound absorption cavity is filled with sound absorption material, and a side of the isolation shell close to the air duct is provided with a plurality of through holes connecting the sound absorption cavity and the air duct.

[0009] Preferably, the housing includes a first sub-shell and a second sub-shell covering the first sub-shell;

[0010] The first sub-duct and the third sub-duct are provided in the first sub-shell and are spaced from each other. The second sub-duct is provided in the second sub-shell and is connected to the third sub-duct. An air duct inlet connected to the outside is provided at one end of the first sub-duct. The first sub-duct, the second sub-duct and the third sub-duct are connected in sequence to form the air duct. The air inlet of the fan is connected to the third sub-duct. The isolation shell is correspondingly provided to at least one of the first sub-duct, the second sub-duct and the third sub-duct.

[0011] Preferably, the first sub-air duct is provided with the isolation shell correspondingly, the isolation shell is provided at one side of the first sub-air duct, and the plurality of through holes on the isolation shell are in communication with the first sub-air duct.

[0012] Preferably, the second sub-shell is provided with a connecting hole connected to the first sub-air duct, and the airflow in the first sub-air duct passes through the connecting hole vertically upward into the second sub-air duct;

[0013] The second sub-shell is provided with a flow channel which is perpendicular to both the second sub-air duct and the third sub-air duct, and the airflow in the second sub-air duct passes through the flow channel vertically downward into the third sub-air duct.

[0014] Preferably, the housing further comprises:

[0015] The third sub-shell is covered on the second sub-shell, and the fan is encapsulated inside the third sub-shell.

[0016] Preferably, the side wall of the air duct is provided with an avoidance groove for avoiding the isolation shell, the isolation shell is installed in the avoidance groove, and the side surface of the isolation shell provided with a plurality of the through holes constitutes the side wall of the air duct.

[0017] Preferably, it also includes a silicone sleeve which is sleeved on the edge of the fan and is used to support the fan, and the fan is suspended in the shell through the silicone sleeve.

[0018] Preferably, the bottom of the silicone sleeve has a lip, the shell is provided with a sealing groove which is arranged around the air inlet of the fan and matches the lip, and the lip is embedded in the sealing groove.

[0019] Preferably, each side surface of the shell is also covered with sound-absorbing cotton.

[0020] The utility model also provides a respirator, comprising the above-mentioned respirator noise reduction device.

[0021] The utility model provides a ventilator noise reduction device by arranging at least one isolation shell outside the air duct, arranging a sound absorbing cavity inside the isolation shell, and filling the sound absorbing cavity with sound absorbing material, and providing a plurality of through holes connecting the sound absorbing cavity and the air duct on the side of the isolation shell close to the air duct, and the sound absorbing cavity of the isolation shell is connected with the air duct by means of the plurality of through holes; after the outside air enters the air duct, when the air in the air duct flows through the plurality of through hole positions of the isolation shell along the air duct, the plurality of through holes and the sound absorbing material in the sound absorbing cavity are used to absorb the airflow energy at the same time, and at the same time, the sound absorbing cavity forms a resonant silencing cavity together with the air duct through the plurality of through holes, thereby reducing the air flow velocity in the air duct and achieving a perforated plate type silencing effect, thereby achieving a good noise reduction effect of the ventilator and improving the user experience of the ventilator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional schematic diagram of a ventilator noise reduction device provided by an embodiment of the utility model;

[0023] Figure 2 A three-dimensional exploded view of a ventilator noise reduction device provided by an embodiment of the utility model;

[0024] Figure 3 A three-dimensional exploded view of the housing of the ventilator noise reduction device provided by an embodiment of the utility model;

[0025] Figure 4 Another exploded perspective view of the housing of the ventilator noise reduction device provided by an embodiment of the utility model;

[0026] Figure 5 A cross-sectional schematic diagram of a ventilator noise reduction device provided by an embodiment of the utility model;

[0027] Figure 6 It is a three-dimensional schematic diagram of the partial structure of the ventilator noise reduction device;

[0028] Figure 7 This is a cross-sectional schematic diagram of a partial structure of a ventilator noise reduction device.

[0029] Description of reference numerals:

[0030] 1. Shell; 10. Air duct; 3. Fan; 31. Air inlet; 5. Isolation shell; 51. Sound-absorbing cavity; 52. Sound-absorbing material; 50. Side; 53. Through hole; 11. First sub-shell; 12. Second sub-shell; 13. Third sub-shell; 101. First sub-air duct; 103. Third sub-air duct; 102. Second sub-air duct; 105. Air duct inlet; 32. Air outlet; 106. Avoidance groove; 120. Connecting hole; 121. Flow channel; 6. Silicone sleeve; 61. Lip; 122. Sealing groove; 8. Sound-absorbing cotton. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] A ventilator noise reduction device provided by an embodiment of the utility model is provided by arranging at least one isolation shell outside the air duct, arranging a sound absorbing cavity inside the isolation shell, filling the sound absorbing cavity with sound absorbing material, and providing a plurality of through holes connecting the sound absorbing cavity and the air duct on the side of the isolation shell close to the air duct, and the sound absorbing cavity of the isolation shell is connected with the air duct by means of the plurality of through holes; after the outside air enters the air duct, when the air in the air duct flows through the plurality of through hole positions of the isolation shell along the air duct, the plurality of through holes and the sound absorbing material in the sound absorbing cavity simultaneously absorb the energy of the air flow, and at the same time, the sound absorbing cavity forms a resonant silencing cavity together with the air duct through the plurality of through holes, thereby reducing the air flow velocity in the air duct and achieving a perforated plate type silencing effect, thereby achieving a good noise reduction effect of the ventilator and improving the user experience.

[0033] Please refer to Figure 1-Figure 7 , a ventilator noise reduction device provided by an embodiment of the utility model comprises:

[0034] A housing 1, wherein an air duct 10 communicating with the outside is provided in the housing 1;

[0035] A fan 3 is installed on the housing 1, and an air inlet 31 of the fan 3 is connected to the air duct 10; and

[0036] At least one isolation shell 5 is arranged outside the air duct 10 and close to the air duct 10, a sound absorbing cavity 51 is arranged in the isolation shell 5, and the sound absorbing cavity 51 is filled with sound absorbing material 52, and a side 50 of the isolation shell 5 close to the air duct 10 is provided with a plurality of through holes 53 connecting the sound absorbing cavity 51 and the air duct 10.

[0037] In an embodiment of the utility model, a ventilator noise reduction device is provided by arranging at least one isolation shell 5 outside the air duct 10, and a sound absorbing cavity 51 is provided in the isolation shell 5, and a sound absorbing material 52 is filled in the sound absorbing cavity 51, and a plurality of through holes 53 connecting the sound absorbing cavity 51 and the air duct 10 are provided on the side 50 of the isolation shell 5 close to the air duct 10; the air duct 10 is connected to the outside through the air duct inlet 105, and after the air enters the air duct 10 from the air duct inlet 105, when the air in the air duct 10 flows along the air duct 10 through the plurality of through holes 53 on the isolation shell 5, the air in the air duct 10 uses the plurality of through holes 53 and the sound absorbing material 52 in the sound absorbing cavity 51 to absorb the air flow energy, so that the gas consumes energy during the flow process, and avoids the noise caused by the violent fluid flow. At the same time, the sound absorbing cavity 51 forms a resonant silencer cavity with the air duct 10 through the plurality of through holes 53, further reducing the air flow rate in the air duct 10 and achieving the perforated plate silencer effect, thereby achieving a good noise reduction effect of the ventilator.

[0038] In an embodiment of the utility model, the shell 1 can be an integrated type, and a single air duct 10 is arranged in the shell 1; alternatively, the shell 1 is composed of a plurality of sub-shells which are sequentially covered from bottom to top, each sub-shell being provided with a sub-air duct, and the sub-air ducts of the plurality of sub-shells are sequentially connected to form the air duct 10, which is conducive to increasing the overall length of the air duct 10, extending the air flow path, further reducing the flow energy of the air flowing to the air inlet 31 of the fan 3, and further reducing the generated noise.

[0039] Please refer to Figure 2-Figure 5 As an embodiment of the present utility model, the housing 1 includes a first sub-shell 11 and a second sub-shell 12 covering the first sub-shell 11;

[0040] A first sub-duct 101 and a third sub-duct 103 spaced apart from each other are provided in the first sub-shell 11, a second sub-duct 102 connected to the third sub-duct 103 is provided in the second sub-shell 12, an air duct inlet 105 connected to the outside is provided at one end of the first sub-duct 101, the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 are connected in sequence to form the air duct 10, at least one of the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 is correspondingly provided with an isolation shell 5; the air inlet 31 of the fan 3 is connected to the third sub-duct 103, and the air inlet 31 of the fan 3 is connected to the third sub-duct 103.

[0041] In this embodiment, the fan 3 is specifically installed on the second sub-shell 12. The second sub-shell 12 and the first sub-shell 11 cover each other, and the specific connection method is not limited, and they can be buckled together or connected by fasteners. After the second sub-shell 12 and the first sub-shell 11 cover each other, the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 are in a closed state, and only the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 are connected in sequence, so that the air entering from the air inlet end of the first sub-duct 101 enters the air inlet 31 of the fan 3 along the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 in sequence, and then is discharged from the air outlet 32 ​​of the fan 3. Among them, the specific shapes of the first sub-duct 101, the second sub-duct 102, and the third sub-duct 103 are not limited. In actual application, the first sub-duct 101, the second sub-duct 102, and the third sub-duct 103 are bent as many times as possible to extend the length of the first sub-duct 101, the second sub-duct 102, and the third sub-duct 103, and reduce the air flow velocity at the air inlet 31 of the fan 3 to reduce noise.

[0042] In the present embodiment, a first sub-duct 101, a second sub-duct 102 and a third sub-duct 103 are provided, and the first sub-duct 101, the second sub-duct 102 and the third sub-duct 103 which are independently provided are connected to form the duct 10. In this way, the overall length of the duct 10 can be increased, and the length of the movement path of the airflow entering the air inlet 31 of the fan 3 can be increased, thereby reducing the airflow velocity at the air inlet 31 of the fan 3 to further reduce noise.

[0043] As an embodiment of the present utility model, the isolation shell 5 is separately provided from the shell 1 , and the isolation shell 5 can be detachably installed on the shell 1 , which helps to reduce the processing difficulty and facilitates the processing of the isolation shell 5 .

[0044] As another embodiment of the present invention, the isolation shell 5 and the housing 1 are integrally formed, which can reduce the assembly process and the overall structural stability, but the processing is slightly complicated.

[0045] As an embodiment of the present invention, the sound absorbing material 52 can be specifically sound absorbing cotton. Of course, the sound absorbing material 52 can also be other materials with specific sound absorbing functions.

[0046] In the embodiment of the utility model, the diameter of the plurality of through holes 53 is 0.2-3.5 mm, and the specific design can be made according to actual conditions.

[0047] In the embodiment of the utility model, the isolation shell 5 can be one or more, for example, one, two or more. When there is one isolation shell 5, when the air of the air duct 10 flows through the multiple through holes 53 on the isolation shell 5 along the air duct 10, the multiple through holes 53 on the isolation shell 5 and the sound absorbing material 52 in the sound absorbing cavity 51 absorb the air flow energy together, and at the same time, the sound absorbing cavity 51 of the isolation shell 5 forms a resonant silencing cavity with the air duct 10 through the multiple through holes 53, reducing the air flow rate in the air duct 10 and achieving the perforated plate type silencing effect, thereby achieving a better noise reduction effect of the ventilator.

[0048] In the embodiment of the utility model, when there are multiple isolation shells 5, each isolation shell 5 is provided with a sound absorbing cavity 51, each sound absorbing cavity 51 is filled with a sound absorbing material 52, and each isolation shell 5 is provided with a plurality of through holes 53 connecting the sound absorbing cavity 51 and the air duct 10 on the side 50 close to the air duct 10. When the air in the air duct 10 flows along the air duct 10, each time it passes through the multiple through holes 53 of an isolation shell 5, the multiple through holes 53 on the corresponding isolation shell 5 and the sound absorbing material 52 in the sound absorbing cavity 51 absorb the air flow energy together, and at the same time, the sound absorbing cavity 51 of the isolation shell 5 is used to form a resonance silencing cavity through the multiple through holes 53 with the air duct 10, so as to reduce the air flow rate in the air duct 10 and achieve a perforated plate type silencing effect, so that noise reduction is achieved once each time it passes through the position of an isolation shell 5, so that multiple noise reduction can be achieved, and the noise reduction effect can be further improved. Among them, the accompanying drawings illustrate a specific embodiment in which the number of isolation shells 5 is one.

[0049] Please refer to Figure 6-Figure 7 As a preferred embodiment of the utility model, the number of the isolation shell 5 is one, the isolation shell 5 is arranged outside the first sub-air duct 101 and close to the first sub-air duct 101, and the side 50 of the isolation shell 5 close to the first sub-air duct 101 is provided with a plurality of through holes 53 connecting the sound absorbing cavity 51 and the first sub-air duct 101.

[0050] In this embodiment, the air of the air duct 10 enters the first sub-duct 101 from the air duct inlet 105 of the first sub-duct 101. When the air flows through the multiple through holes 53 on the isolation shell 5, the multiple through holes 53 on the isolation shell 5 and the sound-absorbing material 52 in the sound-absorbing cavity 51 absorb the airflow energy together, so that the gas consumes energy during the flow in the first sub-duct 101. At the same time, the sound-absorbing cavity 51 of the isolation shell 5 forms a resonant silencer cavity with the first sub-duct 101 through the multiple through holes 53, further reducing the air flow rate in the air duct 10 and achieving a perforated plate silencer effect, thereby achieving a better noise reduction effect of the ventilator.

[0051] As an embodiment of the utility model, the first sub-air duct 101 is provided with an isolation shell 5 correspondingly, the isolation shell 5 is provided at one side of the first sub-air duct 101, and a plurality of through holes 53 on the isolation shell 5 are connected with the first sub-air duct 101. By providing the isolation shell 5 at one side of the first sub-air duct 101, after the air enters the first sub-air duct 101, the plurality of through holes 53 on the isolation shell 5 and the sound absorbing material 52 in the sound absorbing cavity 51 can be used in time to absorb the airflow energy in the first sub-air duct 101, and at the same time, the sound absorbing cavity 51 forms a resonance silencing cavity with the first sub-air duct 101 through the plurality of through holes 53, which can better achieve a better noise reduction effect of the ventilator, and the structure is simple and the implementation cost is low.

[0052] Please refer to Figure 2-7As an embodiment of the utility model, the side wall of the air duct 10 is provided with an avoidance groove 106 for avoiding the isolation shell 5, the isolation shell 5 is installed in the avoidance groove 106, and the isolation shell 5 is provided with a side 50 of a plurality of through holes 53 to form the side wall of the air duct 10.

[0053] In this embodiment, the side surface 50 of the isolation shell 5 with multiple through holes 53 constitutes the side wall of the air duct 10, so that the airflow in the air duct 10 directly flows through the side surface 50 of the isolation shell 5 with multiple through holes 53, which facilitates the airflow to flow through the side surface 50 of the isolation shell 5, and facilitates the airflow to enter the sound absorption cavity 51 of the isolation shell 5 from the multiple through holes 53, so as to facilitate the multiple through holes 53 on the isolation shell 5 and the sound absorbing material 52 in the sound absorption cavity 51 to absorb the airflow energy together.

[0054] Specifically, the first sub-shell 11 is provided with an avoidance groove 106 located at one side of the first sub-air duct 101 , the isolation shell 5 is installed in the avoidance groove 106 , and the side surface 50 of the isolation shell 5 with multiple through holes 53 constitutes the side wall of the first sub-air duct 101 .

[0055] As an embodiment of the utility model, the side surface 50 of the isolation shell 5 with multiple through holes 53 is a smoothly arranged arc surface, which reduces the resistance of the airflow and helps to reduce the noise generated by the airflow passing through the side surface 50 of the isolation shell 5.

[0056] As an embodiment of the present utility model, the second sub-shell 12 is provided with a connecting hole 120 connected to the first sub-air duct 101, and the airflow in the first sub-air duct 101 passes through the connecting hole 120 vertically upward into the second sub-air duct 102;

[0057] The second sub-shell 12 is provided with a flow channel 121 which is perpendicular to both the second sub-air duct 102 and the third sub-air duct 103 . The airflow in the second sub-air duct 102 flows vertically downward into the third sub-air duct 103 through the flow channel.

[0058] In this embodiment, the specific shape of the connecting hole 120 is not limited. The airflow in the first sub-air duct 101 vertically enters the second sub-air duct 102 from the connecting hole 120, and the airflow in the second sub-air duct 102 flows vertically downward through the flow channel 121 to enter the third sub-air duct 103. The airflow changes back and forth through multiple sub-air ducts, which is conducive to accelerating dissipation and reducing the transmission of sound, thereby further reducing noise.

[0059] As an embodiment of the present invention, the flow channel 121 is a plurality of columnar channels, which is easy to process and can reduce the noise generated by the airflow in the second sub-air channel 102 flowing to the third sub-air channel 103 .

[0060] As an embodiment of the present utility model, the housing 1 further includes:

[0061] The third sub-shell 13 covers the second sub-shell 12 , and the fan 3 is encapsulated inside the third sub-shell 13 .

[0062] In this embodiment, by providing the third sub-shell 13 , it is convenient to package the fan 3 and improve the safety performance; moreover, the third sub-shell 13 can be used to close the second sub-duct 102 so that the second sub-duct 102 can only enter the third sub-duct 103 .

[0063] Please refer to Figure 5 As an embodiment of the utility model, it also includes a silicone sleeve 6 which is sleeved on the edge of the fan 3 and used to support the fan 3 , and the fan 3 is suspended in the housing 1 through the silicone sleeve 6 .

[0064] In this embodiment, the fan 3 is suspended in the housing 1 by means of a silicone sleeve 6 to prevent the fan 3 from directly contacting the housing 1 , which is conducive to achieving shock absorption of the fan 3 , achieving a good shock absorption effect, and reducing noise generated by vibration of the fan 3 .

[0065] Specifically, the fan 3 is suspended in the second sub-shell 12 by means of the silicone sleeve 6 , and the air inlet 31 of the fan 3 is placed in the third sub-air duct 103 , so that the airflow in the third sub-air duct 103 enters the air inlet 31 of the fan 3 .

[0066] As an embodiment of the present invention, the bottom of the silicone sleeve 6 has a lip 61 , the housing 1 has a sealing groove 122 arranged around the air inlet 31 of the fan 3 and matched with the lip 61 , and the lip 61 is embedded in the sealing groove 122 .

[0067] In the present embodiment, the lip 61 at the bottom of the silicone sleeve 6 can be specifically an eight-shaped shape, and the lip 61 of the silicone sleeve 6 is embedded in the sealing groove 122 to achieve sealing between the air duct 10 and the edge of the fan 3, so that the airflow at the air outlet end of the air duct 10 can only enter the fan 3 along the air inlet 31 of the fan 3, and the air shock absorption of the fan 3 can be achieved. Therefore, the effects of air shock absorption and sealing can be achieved at the same time, which can effectively reduce noise.

[0068] Specifically, a sealing groove 122 is provided on the second sub-shell 12, and the lip 61 of the silicone sleeve 6 is embedded in the sealing groove 122 to achieve sealing between the third sub-duct 103 and the fan 3, so that the airflow of the third sub-duct 103 can only enter the fan 3 along the air inlet 31 of the fan 3.

[0069] Please refer again Figure 1 As an embodiment of the present utility model, each side surface of the shell 1 is also covered with sound-absorbing cotton 8.

[0070] Specifically, each side surface of the first subshell 11, the second subshell 12 and the third subshell 13 can be covered with sound-absorbing cotton 8, so that the isolation shell 5 can be used to reduce noise while the sound-absorbing cotton 8 can be used to absorb noise. By combining the two noise reduction schemes, the noise reduction effect of the ventilator can be further improved.

[0071] The embodiment of the utility model also provides a ventilator, including the ventilator noise reduction device of the above embodiment. The ventilator provided by the embodiment of the utility model can effectively reduce the airflow velocity of the air duct 10 and achieve a perforated plate type silencing effect by setting the ventilator noise reduction device of the above embodiment, thereby greatly improving the noise reduction effect of the ventilator.

[0072] A ventilator noise reduction device provided by an embodiment of the utility model is provided with at least one isolation shell 5 outside the air duct 10, a sound absorbing cavity 51 is provided in the isolation shell 5, and a sound absorbing material 52 is filled in the sound absorbing cavity 51, and a plurality of through holes 53 connecting the sound absorbing cavity 51 and the air duct 10 are provided on the side 50 of the isolation shell 5 close to the air duct 10. Air enters the air duct 10 from the entrance of the air duct 10. When the air of the air duct 10 flows through the plurality of through holes 53 on the isolation shell 5 along the air duct 10, the plurality of through holes 53 and the sound absorbing material 52 in the sound absorbing cavity 51 are used to absorb the energy of the air flow, so that the gas consumes energy during the flow process, and the noise caused by the violent fluid flow is avoided. At the same time, the sound absorbing cavity 51 forms a resonant silencer cavity with the air duct 10 through the plurality of through holes 53, thereby reducing the air flow rate in the air duct 10 and achieving the perforated plate type silencer effect, thereby achieving a good noise reduction effect of the ventilator.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ventilator noise reduction device, characterized in that: include: A shell, wherein an air duct communicating with the outside is provided in the shell; A fan installed on the housing, wherein an air inlet of the fan is connected to the air duct; as well as At least one isolation shell is arranged outside the air duct and close to the air duct, a sound absorption cavity is arranged in the isolation shell, the sound absorption cavity is filled with sound absorption material, and a side of the isolation shell close to the air duct is provided with a plurality of through holes connecting the sound absorption cavity and the air duct.

2. The ventilator noise reduction device according to claim 1, characterized in that: The housing includes a first sub-shell and a second sub-shell covering the first sub-shell; The first sub-duct and the third sub-duct are provided in the first sub-shell and are spaced from each other. The second sub-duct is provided in the second sub-shell and is connected to the third sub-duct. An air duct inlet connected to the outside is provided at one end of the first sub-duct. The first sub-duct, the second sub-duct and the third sub-duct are connected in sequence to form the air duct. The air inlet of the fan is connected to the third sub-duct. The isolation shell is correspondingly provided to at least one of the first sub-duct, the second sub-duct and the third sub-duct.

3. The ventilator noise reduction device according to claim 2, characterized in that: The first sub-air duct is correspondingly provided with the isolation shell, the isolation shell is arranged at one side of the first sub-air duct, and the plurality of through holes on the isolation shell are in communication with the first sub-air duct.

4. The ventilator noise reduction device according to claim 2, characterized in that: The second sub-shell is provided with a connecting hole connected with the first sub-air duct, and the airflow in the first sub-air duct passes through the connecting hole vertically upward into the second sub-air duct; The second sub-shell is provided with a flow channel which is perpendicular to both the second sub-air channel and the third sub-air channel, and the airflow in the second sub-air channel passes through the flow channel vertically downward into the third sub-air channel.

5. The ventilator noise reduction device according to claim 2, characterized in that: The housing further comprises: The third sub-shell is covered on the second sub-shell, and the fan is packaged inside the third sub-shell.

6. The ventilator noise reduction device according to claim 1, characterized in that: The side wall of the air duct is provided with an avoidance groove for avoiding the isolation shell, the isolation shell is installed in the avoidance groove, and the side surface of the isolation shell provided with a plurality of through holes constitutes the side wall of the air duct.

7. The ventilator noise reduction device according to claim 1, characterized in that: It also includes a silicone sleeve which is sleeved on the edge of the fan and is used to support the fan, and the fan is suspended in the shell through the silicone sleeve.

8. The ventilator noise reduction device according to claim 7, characterized in that: The bottom of the silicone sleeve is provided with a lip edge, and the shell is provided with a sealing groove which is arranged around the air inlet of the fan and matches with the lip edge, and the lip edge is embedded in the sealing groove.

9. The ventilator noise reduction device according to claim 1, characterized in that: Each side surface of the shell is also covered with sound-absorbing cotton.

10. A ventilator, characterized in that: It comprises a ventilator noise reduction device as described in any one of claims 1 to 9.

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