Soundproofing fan

Abstract

This utility model aims to provide a soundproof fan, which includes an inner shell and a core motor. An air cavity is formed within the inner shell, and an air outlet communicating with the air cavity is formed at one end of the inner shell. Several air inlets communicating with the air cavity are formed on the side wall of the inner shell away from the air outlet. Several arc-shaped air ducts are formed on the inner bottom wall of the air cavity near the air inlets. One end of each arc-shaped air duct communicates with a corresponding air inlet, and the other ends of each arc-shaped air duct converge at the center of the inner bottom wall of the air cavity to form an air collection groove. A stop block is provided on the inner side wall of each arc-shaped air duct. The core motor is disposed within the air cavity, and the core motor cover is disposed on each arc-shaped air duct so that the air inlet end of the core motor communicates with the air collection groove. In this way, by controlling the sound of the core motor within the inner shell and reducing the way sound is transmitted to the outside, the soundproof fan has a better sound insulation and noise reduction effect compared to existing technologies.

Description

Technical Field

[0001] This utility model relates to the technical field of fans, and in particular to a soundproof fan. Background Technology

[0002] A fan is a device that uses an electric motor to drive an impeller to rotate, converting electrical energy into wind energy through mechanical energy. It is commonly used in scenarios such as suction, inflation, and ventilation, such as air conditioners, vacuum cleaners, and blowers.

[0003] As the application scope of wind turbines expands, the noise generated during their operation has become increasingly prominent, becoming a key bottleneck restricting the expansion of wind turbine application scenarios. Currently, the main sources of noise during wind turbine operation are as follows: First, the high-speed rotation of the impeller inside the wind turbine interacts with the gas, generating airflow disturbances such as eddies and turbulence, forming aerodynamic noise, which is the main component of wind turbine noise; Second, the moving parts of the wind turbine, such as the motor and bearings, generate mechanical noise during operation due to friction, vibration, and clearance between parts; Third, when the wind turbine casing and connecting pipes are subjected to internal vibration excitation, structural vibration radiation noise is generated, further aggravating the overall pollution level of the wind turbine.

[0004] The noise generated during the operation of the fan not only seriously disturbs the surrounding environment, but also, long-term exposure to high-decibel noise can easily lead to hearing damage, reduce user concentration, and affect the user's physical and mental health.

[0005] Therefore, in order to address the above-mentioned shortcomings, the soundproof fan of this application is proposed. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a soundproof fan that can effectively reduce noise.

[0007] The objective of this utility model is achieved through the following technical solution: A soundproof fan, comprising: An inner shell, wherein an air cavity is formed within the inner shell, and an air outlet is formed at one end of the inner shell communicating with the air cavity. Several air inlets are formed on the side wall of the inner shell away from the air outlet, communicating with the air cavity. Several arc-shaped air channels are formed on the inner bottom wall of the air cavity near the air inlets, with one end of each arc-shaped air channel corresponding to one of the air inlets, and the other ends of each arc-shaped air channel converging at the center of the inner bottom wall of the air cavity to form an air collecting groove. A stop block is provided on the inner side wall of each arc-shaped air channel. The motor is disposed within the air cavity and the motor cover is disposed on each of the arc-shaped air ducts so that the air inlet end of the motor is connected to the air collection groove.

[0008] Optionally, a first shock-absorbing sleeve is fitted on the outer wall of the motor, and the first shock-absorbing sleeve is in contact with the inner wall of the air cavity.

[0009] Optionally, a sound insulation layer is also provided between the core motor and each of the arc-shaped air ducts.

[0010] Optionally, the inner diameter of the arc-shaped air duct gradually decreases from the air outlet towards the air collection slot.

[0011] Optionally, a heating mesh is provided inside the air cavity between the core motor and the air outlet.

[0012] Optionally, the soundproof fan further includes a sealing valve, which includes a valve frame, a sealing plate, and an elastic element. The valve frame is slidably mounted on the inner shell along the axial direction of the air outlet. The sealing plate is mounted on the valve frame, and the elastic element is sleeved on the valve frame so that both ends of the elastic element abut against the valve frame and the inner shell, respectively. The elastic element is used to push the valve frame to drive the sealing plate to block the air outlet.

[0013] Optionally, two sealing valves are provided, and the two sealing valves are distributed at an axial distance along the air outlet.

[0014] Optionally, the soundproof fan further includes a housing, the housing having a cavity inside, a clearance hole communicating with the cavity being provided at one end of the housing, and an external through hole communicating with the cavity being provided at the end of the housing near the clearance hole, the inner housing being housed within the cavity, and the end of the inner housing near the air outlet extending through the clearance hole, and the outer sidewall of the inner housing being spaced apart from the inner sidewall of the cavity.

[0015] Optionally, at least one sound-insulating cotton ring is fitted on the outer side wall of the inner shell, and each of the sound-insulating cotton rings abuts against the inner side wall of the shell cavity.

[0016] Optionally, the inner shell is further fitted with a second shock-absorbing sleeve at the location of the vent hole, and the second shock-absorbing sleeve abuts against the inner sidewall of the vent hole.

[0017] Compared with the prior art, the present invention has at least the following advantages: This invention discloses a soundproof fan, comprising an inner shell and a core motor. The inner shell contains an air cavity, and one end of the inner shell has an air outlet communicating with the air cavity. The side wall of the inner shell away from the air outlet has several air inlets communicating with the air cavity. The inner bottom wall of the air cavity near the air inlets has several arc-shaped air ducts, one end of each arc-shaped air duct corresponding to an air inlet, and the other ends of each arc-shaped air duct converging at the center of the inner bottom wall of the air cavity to form an air collection groove. A stop block is provided on the inner side wall of each arc-shaped air duct. The core motor is disposed within the air cavity, and a cover is provided on each arc-shaped air duct so that the air inlet end of the core motor communicates with the air collection groove. Thus, compared to existing technologies that only install a single core motor, this soundproof fan, by controlling the sound of the core motor within the inner shell and reducing sound transmission to the outside, achieves a significantly better sound insulation and noise reduction effect than existing technologies. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a soundproof fan according to one embodiment of the present invention; Figure 2 for Figure 1 The diagram shows the exploded structure of the soundproof fan. Figure 3 for Figure 1 A schematic cross-sectional view of the soundproof fan shown; Figure 4 This is a schematic diagram of the front housing structure according to one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a sealing valve according to one embodiment of the present invention; Figure 6 for Figure 5 The diagram shows the exploded structure of the sealing valve. Figure 7 This is a structural schematic diagram of a soundproof fan according to another embodiment of the present invention; Figure 8 for Figure 7 A schematic cross-sectional view of the soundproof fan shown; Figure 9 for Figure 7 The diagram shows the exploded structure of the soundproof fan.

[0020] Explanation of reference numerals in the attached figures: 10. Soundproof fan; 100. Inner shell; 200. Motor core; 110. Air cavity; 120. Air outlet; 130. Air inlet; 140. Arc-shaped air duct; 150. Air collection slot; 160. Stop block; 310. First shock-absorbing sleeve; 101. Front shell; 102. Rear shell; 320. Sound insulation layer; 400. Heating mesh; 500. Sealing valve; 510. Valve frame; 520. Sealing sheet; 530. Elastic element; 600. Outer shell; 610. Shell cavity; 620. Clearance hole; 630. External through hole; 330. Sound insulation cotton ring; 340. Second shock-absorbing sleeve; 103. Valve shell; 350. Third shock-absorbing sleeve; 601. Half shell. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more comprehensive description will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model.

[0022] like Figures 1 to 4 As shown, a soundproof fan 10 includes an inner shell 100 and a core motor 200. An air cavity 110 is formed inside the inner shell 100. An air outlet 120 communicating with the air cavity 110 is formed at one end of the inner shell 100. Several air inlets 130 communicating with the air cavity 110 are formed on the side wall of the inner shell 100 away from the air outlet 120. Several arc-shaped air ducts 140 are formed on the inner bottom wall of the air cavity 110 near the air inlets 130. One end of 140 is connected to each air inlet 130, and the other end of each arc-shaped air duct 140 converges and connects at the center of the inner bottom wall of the air cavity 110 to form an air collection groove 150. A stop block 160 is provided on the inner side wall of each arc-shaped air duct 140. The core motor 200 is located in the air cavity 110, and the core motor 200 covers each arc-shaped air duct 140 so that the air inlet end of the core motor 200 is connected to the air collection groove 150.

[0023] It should be noted that the structure of the core motor 200 includes a motor, an impeller, and an impeller housing. The motor is mounted on the impeller housing, and the impeller is mounted on the output shaft of the motor, with the impeller located inside the impeller housing. A hole is formed at the center of the end face of the impeller housing furthest from the motor; this hole is the air inlet of the core motor 200. Thus, when the motor is powered to drive the impeller to rotate, the impeller drives the gas through the air inlet to enter the impeller housing, and then flows over the surface of the motor, thereby enabling the gas to flow in a directional manner. For example, the core motor 200 can be a vacuum cleaner fan structure in the prior art. Since the core motor 200 can adopt an existing structure, its structure is not the subject of protection in this application and will not be described in detail. Furthermore, an air chamber 110 is formed inside the inner shell 100, and an air outlet 120 is formed at one end of the inner shell 100, with the air outlet 120 located axially in the inner shell 100. Multiple air inlets 130 begin to appear on the outer wall of the other end of the inner shell 100, each air inlet 130 being radially positioned within the inner shell 100. Further, several arc-shaped air ducts 140 are provided on the inner bottom wall of the air cavity 110 near the air inlets 130, each arc-shaped air duct 140 being distributed at equal angles around its circumference. One end of each arc-shaped air duct 140 is connected to a corresponding air inlet 130. The other ends of each arc-shaped air duct 140 converge and connect at the axis of the air cavity 110 to form an air collecting groove 150. For example, several arc-shaped protrusions are provided on the inner bottom wall of the air cavity 110, with any two adjacent arc-shaped protrusions forming an arc-shaped air duct 140. Further, a stop block 160 is provided on the inner side wall of the arc-shaped air duct 140. Thus, the core motor 200 is installed inside the air cavity 110, so that the core motor 200 covers each of the arc-shaped air ducts 140, wherein the air inlet end of the core motor 200 is aligned with and connected to the air collection groove 150. In this way, the soundproof fan 10 of this application covers the outer wall of the core motor 200 with the inner shell 100, so that the core motor 200 is located inside the relatively sealed inner shell 100, achieving the purpose of initial sound insulation. Furthermore, under the suction action of the core motor 200, the gas enters the core motor 200 from the air inlet 130 through the arc-shaped air ducts 140 and the air collection groove 150. By setting a stop block 160 on the inner wall of the arc-shaped air duct 140, the stop block 160 can prevent the backflow of gas from colliding with the incoming gas and generating noise. On the other hand, when the sound generated by the core motor 200 is transmitted through the arc-shaped air duct 140 and the air inlet 130, the stop block 160 blocks the sound waves to a certain extent, thereby reducing the sound of the core motor 200 transmitted through the arc-shaped air duct 140 and the air inlet 130. Thus, compared with the prior art where only a single core motor 200 is installed, the sound insulation fan 10 of this application controls the sound of the core motor 200 within the inner shell 100, reducing the amount of sound transmitted to the outside, so that the sound insulation fan 10 has a better sound insulation and noise reduction effect than the prior art.

[0024] like Figure 2 and Figure 3 As shown, in one embodiment, a first shock-absorbing sleeve 310 is fitted on the outer side wall of the motor 200, and the first shock-absorbing sleeve 310 is in contact with the inner side wall of the air cavity 110.

[0025] It should be noted that, in order to reduce the vibration of the motor 200 transmitted to the inner shell 100, a first damping sleeve 310 is fitted over the motor 200, with the outer wall of the first damping sleeve 310 tightly fitted to the inner wall of the air cavity 110. This allows the motor 200 to be embedded and fixed within the air cavity 110 via the first damping sleeve 310. Furthermore, the first damping sleeve 310 is made of rubber, which further reduces the transmission of vibration from the motor 200 to the inner shell 100, achieving a further sound insulation effect.

[0026] like Figure 1 and Figure 2 As shown, in one embodiment, the inner shell 100 includes a front shell 101 and a rear shell 102. The air outlet 120 is located on the rear shell 102, and the air inlet 130 and the arc-shaped air duct 140 are both located on the front shell 101. The rear shell 102 and the front shell 101 are interlocked to form an air cavity 110.

[0027] It should be noted that after the first shock-absorbing sleeve 310 is fitted onto the outer wall of the core motor 200, the first shock-absorbing sleeve 310 is then embedded in the inner wall of the front housing 101, so that the core motor 200 covers an arc-shaped air duct 140. Then, the rear housing 102 is fastened and fixed onto the front housing 101, so that the inner wall of the rear housing 102 and the front housing 101 together form an air cavity 110, and the rear housing 102 and the front housing 101 together clamp and fix the core motor 200. In one embodiment, the front housing 101 and the rear housing 102 can be welded and fixed into an integral inner housing 100 structure by means of ultrasonic welding or other methods. In this way, the core motor 200 is reliably fixed and installed within the air cavity 110 of the inner housing 100.

[0028] like Figure 2 and Figure 3 As shown, in one embodiment, a sound insulation layer 320 is also provided between the core motor 200 and each arc-shaped air duct 140.

[0029] It should be noted that the sound insulation layer 320 is located on the end face of the motor 200 near the air inlet, and the sound insulation layer 320 covers each of the curved air ducts 140. For example, the sound insulation layer 320 is made of sound insulation cotton. In this way, the motor 200 is covered and fixed by the first shock-absorbing sleeve 310 and the sound insulation layer 320, further reducing the vibration of the motor 200 transmitted to the inner shell 100, thereby improving the sound insulation effect of the soundproof fan 10 of this application.

[0030] like Figure 4 As shown, in one embodiment, the inner diameter of the arc-shaped air duct 140 gradually decreases from the air outlet 120 toward the air collection groove 150.

[0031] It should be noted that the structure of the arc-shaped air duct 140 is a structure with a small interior and a large exterior. This reduces the efficiency of the sound of the motor 200 being transmitted through the arc-shaped air duct 140 and the air inlet 130, thereby further improving the sound insulation effect of the soundproof fan 10.

[0032] like Figure 3 As shown, in one embodiment, a heating grid 400 is provided inside the air cavity 110 between the core motor 200 and the air outlet 120.

[0033] It should be noted that by installing a heating mesh 400 near the air outlet 120, the gas is fully heated as it passes through the heating mesh 400 before being blown out from the air outlet 120, thus achieving gas heating. The heating mesh 400 can be any existing heating mesh; its structure is not required to be protected in this application and will not be described further.

[0034] like Figure 3 , Figure 5 and Figure 6 As shown, in one embodiment, the soundproof fan 10 further includes a sealing valve 500. The sealing valve 500 includes a valve frame 510, a sealing plate 520, and an elastic element 530. The valve frame 510 is slidably disposed on the inner shell 100 along the axial direction of the air outlet 120. The sealing plate 520 is disposed on the valve frame 510. The elastic element 530 is sleeved on the valve frame 510 so that both ends of the elastic element 530 abut against the valve frame 510 and the inner shell 100 respectively. The elastic element 530 is used to push the valve frame 510 to drive the sealing plate 520 to block the air outlet 120.

[0035] It should be noted that, in order to achieve unidirectional flow of the soundproof fan 10—that is, when the core motor 200 starts, gas is blown out directionally from the air outlet 120 to achieve flow, and when the core motor 200 stops, the air outlet 120 is blocked—a sealing valve 500 is installed at the location of the air outlet 120. Specifically, the valve frame 510 is slidably mounted on the inner shell 100 along the axial direction of the air outlet 120. A sealing sheet 520 is coaxially fixedly mounted on the valve frame 510; for example, the sealing sheet 520 is made of rubber. An elastic element 530 is sleeved on the valve frame 510, and the elastic element 530 abuts against both the valve frame 510 and the inner shell 100. The elastic element 530 pushes against the valve frame 510, causing the sealing sheet 520 to abut against the air outlet 120 for unidirectional sealing. For example, the elastic element 530 is a coil spring. Thus, when the core motor 200 starts, the gas pushes open the sealing plate 520, the elastic element 530 is compressed, and the gas can be blown out normally from the air outlet 120. When the core motor 200 stops, the sealing plate 520 is pushed by the elastic element 530 and tightly seals the air outlet 120. In this way, the soundproof fan 10 of this application can prevent water from entering the air cavity 110 from the air outlet 120.

[0036] like Figure 3 As shown, in one embodiment, two sealing valves 500 are provided, and the two sealing valves 500 are distributed at an axial interval along the air outlet 120.

[0037] It should be noted that by setting two sealing valves 500, i.e., setting a double waterproof structure, the waterproof performance inside the air cavity 110 can be further improved. It is important to note that when the sound-insulating fan 10 of this application is used in conjunction with a bathtub mat, i.e., when the sound-insulating fan 10 of this application provides an inflation function for the bathtub mat, which is laid at the bottom of the bathtub and has a large number of micropores, the amount of bubbles in the bathtub can be quickly increased. In this usage scenario, the double waterproof structure constructed by the two sealing valves 500 is particularly important.

[0038] like Figures 7 to 9 As shown, in one embodiment, the soundproof fan 10 further includes a housing 600, a cavity 610 is formed inside the housing 600, a clearance hole 620 communicating with the cavity 610 is formed on one end of the housing 600, and an external through hole 630 communicating with the cavity 610 is also formed on the end of the housing 600 near the clearance hole 620. The inner housing 100 is housed in the cavity 610, and the end of the inner housing 100 near the air outlet 120 extends out through the clearance hole 620. The outer side wall of the inner housing 100 and the inner side wall of the cavity 610 are spaced apart.

[0039] It should be noted that the above structure is designed to further reduce sound transmission. Specifically, the inner shell 100 is entirely embedded within the outer shell 600, with the end of the inner shell 100 near the air outlet 120 protruding through the vent hole 620. A gap is formed between the outer wall of the inner shell 100 and the inner wall of the shell cavity 610. Thus, when the core motor 200 starts, gas enters the interior of the shell cavity 610 through the external through-hole 630 and flows to the end away from the vent hole 620. Then, it enters the core motor 200 through the air inlet 130 and the arc-shaped air duct 140, and finally, the gas pushes open the sealing valve 500 and is blown out through the air outlet 120. In this way, for the soundproof fan 10 with the outer shell 600, its air inlet and air outlet are located at the same end of the outer shell 600. This facilitates the subsequent fixed installation of the soundproof fan 10 within the equipment and further reduces the efficiency of sound transmission from the air inlet. Thus, the inner shell 100 is entirely enclosed within the outer shell 600, while the core motor 200 is entirely enclosed on the inner shell 100. Therefore, the soundproof fan 10 in this embodiment has a dual soundproofing effect. Compared with the structure in the prior art where the core motor 200 is installed separately, the soundproof fan 10 of this application has a good soundproofing and noise reduction effect.

[0040] like Figure 8 and Figure 9 As shown, in one embodiment, at least one sound-insulating cotton ring 330 is fitted on the outer side wall of the inner shell 100, and each sound-insulating cotton ring 330 abuts against the inner side wall of the shell cavity 610.

[0041] It should be noted that, in order to reliably embed and fix the inner shell 100 within the shell cavity 610, and to ensure that the outer wall of the inner shell 100 is spaced apart from the inner wall of the shell cavity 610, multiple sound-insulating cotton rings 330 are fitted onto the outer wall of the inner shell 100, with each sound-insulating cotton ring 330 abutting against the inner wall of the shell cavity 610. In this way, by using the sound-insulating cotton rings 330 to fix the inner shell 100 within the shell cavity 610, the efficiency of sound transmission from the inner shell 100 to the outer shell 600 is reduced, achieving further sound insulation and noise reduction.

[0042] like Figure 8 and Figure 9 As shown, in one embodiment, the inner shell 100 is further fitted with a second shock-absorbing sleeve 340 at the position of the vent hole 620, and the second shock-absorbing sleeve 340 abuts against the inner sidewall of the vent hole 620.

[0043] It should be noted that the inner shell 100 extends through the vent hole 620 to the outside of the outer shell 600. Therefore, a seal is required between the inner shell 100 and the vent hole 620 to improve the stability of the inner shell 100 embedded and fixed within the outer shell 600. Therefore, a second shock-absorbing sleeve 340 is also fitted onto the inner shell 100, and the second shock-absorbing sleeve 340 is fitted and fixed to the vent hole 620. In one embodiment, the second shock-absorbing sleeve 340 is also made of rubber.

[0044] like Figure 1 As shown, in one embodiment, the inner shell 100 further includes a valve shell 103, which is disposed on the end face of the rear shell 102 away from the front shell 101. A valve bracket 510 is slidably disposed within the valve shell 103. An elastic element 530 abuts against both the valve shell 103 and the valve bracket 510. The end of the valve shell 103 away from the rear shell 102 protrudes through a clearance hole 620. A sound-insulating cotton ring 330 is fitted onto the valve shell 103, and a second shock-absorbing sleeve 340 is fitted onto the valve shell 103 at the location of the clearance hole 620. This facilitates the installation of the sealing valve 500 within the inner shell 100, and the structure of the inner shell 100 consisting of the front shell 101, rear shell 102, and valve shell 103 facilitates parts production and assembly.

[0045] like Figure 8 As shown, in one embodiment, a third shock-absorbing sleeve 350 is also provided on the end face of the inner shell 100 away from the air outlet 120, and the outer side wall of the third shock-absorbing sleeve 350 abuts against the inner side wall of the shell cavity 610 away from the vent hole 620.

[0046] It should be noted that this can further improve the stability of the inner shell 100 relative to the outer shell 600, while reducing the efficiency of sound transmission from the inner shell 100 to the outer shell 600. In one embodiment, the third damping sleeve 350 is also made of rubber.

[0047] like Figure 7 and Figure 9 As shown, in one embodiment, the outer shell 600 includes two half-shells 601, which interlock to form the outer shell 600. This facilitates the inner shell 100 being fixedly installed within the two half-shells 601. In one embodiment, the two half-shells 601 are fixedly installed by screws.

[0048] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the utility model patent. Unless otherwise specifically defined, the installation / fixing / setting mentioned in this utility model can be understood as including, but not limited to, locking and fixing with screws / bolts, welding, or bonding with adhesives, wherein the adhesives used can be commercially available finished products. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A soundproof fan, characterized in that, include: An inner shell, wherein an air cavity is formed within the inner shell, and an air outlet is formed at one end of the inner shell communicating with the air cavity. Several air inlets are formed on the side wall of the inner shell away from the air outlet, communicating with the air cavity. Several arc-shaped air channels are formed on the inner bottom wall of the air cavity near the air inlets, with one end of each arc-shaped air channel corresponding to one of the air inlets, and the other ends of each arc-shaped air channel converging at the center of the inner bottom wall of the air cavity to form an air collecting groove. A stop block is provided on the inner side wall of each arc-shaped air channel. The motor is disposed within the air cavity and the motor cover is disposed on each of the arc-shaped air ducts so that the air inlet end of the motor is connected to the air collection groove.

2. The soundproof fan according to claim 1, characterized in that, A first shock-absorbing sleeve is fitted on the outer wall of the motor, and the first shock-absorbing sleeve is in contact with the inner wall of the air cavity.

3. The soundproof fan according to claim 1, characterized in that, A sound insulation layer is also provided between the core motor and each of the arc-shaped air ducts.

4. The soundproof fan according to claim 1, characterized in that, The inner diameter of the arc-shaped air duct gradually decreases from the air outlet towards the air collection slot.

5. The soundproof fan according to claim 1, characterized in that, A heating mesh is provided inside the air cavity between the core motor and the air outlet.

6. The soundproof fan according to claim 1, characterized in that, The soundproof fan also includes a sealing valve, which includes a valve frame, a sealing plate, and an elastic element. The valve frame is slidably mounted on the inner shell along the axial direction of the air outlet. The sealing plate is mounted on the valve frame, and the elastic element is sleeved on the valve frame so that both ends of the elastic element abut against the valve frame and the inner shell, respectively. The elastic element is used to push the valve frame to drive the sealing plate to block the air outlet.

7. The soundproof fan according to claim 6, characterized in that, Two sealing valves are provided, and the two sealing valves are distributed at an axial interval along the air outlet.

8. The soundproof fan according to claim 1, characterized in that, The soundproof fan also includes a housing, which has a cavity inside. One end of the housing has a clearance hole communicating with the cavity. The end of the housing near the clearance hole also has an external through hole communicating with the cavity. The inner housing is housed in the cavity, and the end of the inner housing near the air outlet extends out through the clearance hole. The outer side wall of the inner housing and the inner side wall of the cavity are spaced apart.

9. The soundproof fan according to claim 8, characterized in that, At least one sound-insulating cotton ring is fitted on the outer side wall of the inner shell, and each of the sound-insulating cotton rings abuts against the inner side wall of the shell cavity.

10. The soundproof fan according to claim 8, characterized in that, The inner shell is also fitted with a second shock-absorbing sleeve at the location of the vent hole, and the second shock-absorbing sleeve abuts against the inner sidewall of the vent hole.

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