Axial flow fan capable of absorbing shock and reducing noise

Abstract

The utility model discloses a shock absorption noise reduction axial flow fan, including: fixed casing, fan main part, fan main part includes inner sleeve, drive motor, support and fan, the support is fixed on the inner wall of inner sleeve, drive motor is installed on the support, and the fan is fixed on the inner sleeve. The driving motor is connected with the fan so as to be suitable for driving the fan to rotate in the inner sleeve, a plurality of first damping assemblies are arranged in the connecting sleeve, each first damping assembly comprises a movable plate, a connecting plate and two damping parts, a sliding groove is formed in the movable plate, and the two damping parts are arranged in the sliding groove. The connecting plate is connected into the sliding groove in a sliding mode, the two damping components are connected with one side of the connecting plate and the inner wall, corresponding to the side, of the sliding groove correspondingly, and the damping components are arranged to be matched with the damping components at different angles so that the damping components can be flexibly adjusted according to various vibration modes of the axial flow fan.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow fans, and in particular to an axial flow fan with vibration reduction and noise reduction. Background Art

[0002] At present, axial flow fans are widely used as ventilation equipment in industrial, commercial and home environments. During the operation of axial flow fans, the mechanical vibration generated by the rotation of the motor-driven blades and the aerodynamic noise generated when the airflow passes through the blades may cause the fan to vibrate as a whole, resulting in noise pollution. Especially when the fan is directly fixed on a rigid medium, such as a concrete wall, steel structure support, etc., the vibration may cause the medium to resonate, thereby amplifying the noise.

[0003] A search revealed a Chinese utility model patent with authorization publication number CN209621674U, which discloses an axial flow fan with vibration and noise reduction features. This patent reduces vibration and noise by disposing a cylinder on the outside of the fan and utilizing springs and other structures for cushioning, thereby avoiding direct fixation to a rigid medium. Furthermore, the design includes handles and silicone feet for ease of movement and further enhanced vibration reduction. This simple design facilitates installation and maintenance, and is highly portable. However, the patent's shock-absorbing device has certain design limitations. It only considers vibration in the fan's four basic directions: up, down, left, and right, while ignoring the complex vibration patterns that may occur during actual fan operation. For example, when an axial flow fan rotates at high speed, in addition to basic horizontal and vertical vibrations, it also generates multiple-direction composite vibrations, such as axial sway and torsional vibration, due to factors such as uneven airflow distribution and blade imbalance. These complex vibration patterns place higher demands on the shock-absorbing device, requiring it to have greater flexibility and adaptability, which the shock-absorbing method adopted in this patent cannot effectively address. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the defects in the prior art. By arranging a plurality of shock-absorbing components at different angles to cooperate with each other, the shock-absorbing components can be flexibly adjusted to follow various vibration modes of the axial flow fan.

[0005] In order to solve the above technical problems, the technical solution of the utility model is an axial flow fan with vibration reduction and noise reduction, comprising:

[0006] Fixed shell;

[0007] A fan body, the fan body comprising an inner sleeve, a drive motor, a bracket, and a fan, the bracket being fixed to the inner wall of the inner sleeve, the drive motor being mounted on the bracket, and the drive motor being connected to the fan to drive the fan to rotate inside the inner sleeve;

[0008] A connecting sleeve is inserted into the fixed housing, wherein the connecting sleeve is provided with a plurality of shock absorbing components 1, wherein the shock absorbing components 1 include a movable plate, a connecting plate, and two shock absorbing components. A slide groove is provided in the movable plate, and the connecting plate is slidably connected to the slide groove. The two shock absorbing components are respectively connected to one side of the connecting plate and the inner wall of the slide groove corresponding to the side.

[0009] The outer peripheral surface of the inner sleeve is connected to the corresponding connecting plate of one of the shock-absorbing assemblies. When the inner sleeve produces axial shaking, it drives the connecting plate to synchronously produce position displacement to squeeze the shock-absorbing component. The shock-absorbing component is suitable for driving the connecting plate to reset when it is squeezed by the connecting plate.

[0010] Furthermore, the shock-absorbing component includes a damping telescopic rod and a spring. The fixed end of the damping telescopic rod is connected to the inner wall of the slide groove, and the movable end of the damping telescopic rod is connected to the corresponding side of the connecting plate. The spring is arranged on the outside of the damping telescopic rod, and the two ends of the spring are respectively connected to the inner wall of the slide groove and the corresponding side of the connecting plate.

[0011] Furthermore, a plurality of movable grooves corresponding to the movable plates are provided in the connecting sleeve, the movable plates are slidably connected in the movable grooves, and a second shock absorbing component is provided in the movable grooves;

[0012] The second shock absorbing component includes a second damping telescopic rod and a second spring. The fixed end of the second damping telescopic rod is connected to the inner wall of the corresponding movable groove, and the movable end of the second damping telescopic rod is connected to the corresponding movable plate.

[0013] Furthermore, a movable component is provided between the connecting plates and the outer circumference of the inner sleeve, and the movable component includes a fixed block and a hinge component. The fixed block is connected to the outer circumference of the inner sleeve, and the fixed block and the connecting plates are connected via a hinge component.

[0014] Furthermore, the hinge component includes a hinge shaft and a hinge plate, the hinge plate is connected to the connecting plate, the hinge shaft is arranged on the fixed block, a circular hole is opened in the hinge plate, the hinge plate is movably sleeved on the outside of the hinge shaft, the hinge shaft is located inside the circular hole and there is a gap between the hinge shaft and the circular hole.

[0015] Furthermore, the inner wall of the inner sleeve is provided with installation grooves arranged at intervals, and a sound-absorbing sponge pad is provided in the installation groove.

[0016] Furthermore, grid protection plates are installed at both ends of the inner sleeve.

[0017] Furthermore, the fixed housing is divided into an upper fixed housing and a lower fixed housing, and the upper fixed housing and the lower fixed housing are detachably connected;

[0018] Two grooves are provided in both the upper fixed shell and the lower fixed shell. Two protrusions are provided on the outer peripheral surface of the connecting sleeve, which are opposite to the grooves. The protrusions are inserted into the grooves.

[0019] Furthermore, a rubber pad is provided inside the groove.

[0020] Furthermore, a placement groove is provided in each of the upper fixing shell and the lower fixing shell, and a second sound-absorbing sponge pad is provided in the placement groove.

[0021] By adopting the above technical solution, the utility model has the following beneficial effects:

[0022] 1. Through the arrangement of the shock-absorbing component 1 and the shock-absorbing component 2, the axial flow fan generates vibrations up and down, left and right when it is started, which will cause the position of the connecting plate to shift and squeeze the damping telescopic rod 2 and the spring 2 in the shock-absorbing component 2 to achieve shock absorption. Similarly, when the front and rear axial positions are generated, the shock-absorbing component 1 can be used for shock absorption. The combination of the shock-absorbing component 1 and the shock-absorbing component 2 achieves the effect of shock absorption at multiple angles, making it more flexible to use.

[0023] 2. Through the setting of the hinged connection between the fixed block and the connecting plate, the linkage effect of the shock-absorbing component 1 and the shock-absorbing component 2 at multiple different positions is achieved. When the axial flow fan vibrates at one angle, the shock-absorbing components at all other positions will be subjected to force together. When subjected to force at the same time, all shock-absorbing components share the vibration force and perform shock-absorbing processing at the same time, resulting in better shock-absorbing effect and faster feedback speed.

[0024] 3. Through the setting of the structure of the silencer sponge pad 1 and the silencer sponge pad 2, the silencer sponge pad 1 is set in the connecting sleeve to directly reduce the noise generated in the inner sleeve, and the silencer sponge pad 2 further reduces the noise that the silencer sponge pad 1 in the connecting sleeve cannot handle. The double noise reduction setting achieves better results.

[0025] 4. Through the arrangement of the upper fixed shell and the lower fixed shell and other structures, the butted connecting sleeve and the inner sleeve are directly placed on the lower fixed shell, the protrusion on the connecting sleeve is butted with the groove on the lower fixed shell, and then the upper fixed shell is covered and connected to the lower fixed shell. The entire installation process including the subsequent disassembly work is more convenient. At the same time, a rubber pad is also provided inside the groove to make the protrusion more stable when inserted into the groove. At the same time, the rubber pad has a certain shrinkage effect to avoid excessive noise when the entire connecting sleeve vibrates, and also avoid the problem of excessive vibration and damage to the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 This is a cross-sectional view of the overall structure of the utility model;

[0028] Figure 3 This is a schematic diagram of the internal structure of the inner sleeve of the present utility model;

[0029] Figure 4 This is a schematic diagram of the connecting sleeve structure of the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the shock absorbing component of the present utility model;

[0031] Figure 6 For the utility model Figure 5 Enlarged view of point A in the middle;

[0032] Figure 7 This is a schematic diagram of the lower fixed shell structure of the present utility model.

[0033] In the figure: 1, fixed shell; 11, upper fixed shell; 12, lower fixed shell; 13, groove; 14, placement slot; 15, sound-absorbing sponge pad 2; 16, rubber pad;

[0034] 2. Grid protection plate;

[0035] 3. Connecting sleeve; 31. Mounting slot; 32. Bump; 33. Noise-absorbing sponge pad 1;

[0036] 4. Fan body; 41. Inner sleeve; 42. Drive motor; 43. Bracket; 44. Fan;

[0037] 5. Connecting plate;

[0038] 6. Movable assembly; 61. Fixed block; 62. Hinge plate; 63. Hinge shaft;

[0039] 7. Shock absorber assembly 1; 71. Moving plate; 72. Damping telescopic rod 1; 73. Spring 1;

[0040] 8. Shock-absorbing assembly 2; 81. Damping telescopic rod 2; 82. Spring 2; 83. Moving slot. DETAILED DESCRIPTION

[0041] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0042] Example 1

[0043] like Figure 1-6 As shown, the vibration-reducing and noise-reducing axial flow fan includes:

[0044] Fixed housing 1;

[0045] The fan body 4 includes an inner sleeve 41, a drive motor 42, a bracket 43, and a fan 44. The bracket 43 is fixed to the inner wall of the inner sleeve 41, and the drive motor 42 is mounted on the bracket 43. The drive motor 42 is connected to the fan 44 to drive the fan 44 to rotate inside the inner sleeve 41.

[0046] The connecting sleeve 3 is inserted into the fixed housing 1. The connecting sleeve 3 is provided with a plurality of shock absorbing components 7. The shock absorbing components 7 include a movable plate 71, a connecting plate 5, and two shock absorbing components. A slide groove is provided in the movable plate 71. The connecting plate 5 is slidably connected to the slide groove. The two shock absorbing components are respectively connected to one side of the connecting plate 5 and the inner wall of the slide groove corresponding to the side.

[0047] The outer peripheral surface of the inner sleeve 41 is connected to the corresponding connecting plates 5 in the plurality of shock-absorbing components 7. The inner sleeve 41 generates axial shaking to drive the connecting plates 5 to synchronously generate position displacement to squeeze the shock-absorbing component. The shock-absorbing component is suitable for driving the connecting plates 5 to reset when squeezed by the connecting plates 5.

[0048] like Figure 5-6 As shown, the shock-absorbing component includes a damping telescopic rod 72 and a spring 73. The fixed end of the damping telescopic rod 72 is connected to the inner wall of the slide groove, and the movable end of the damping telescopic rod 72 is connected to the corresponding side of the connecting plate 5. The spring 73 is sleeved on the outside of the damping telescopic rod 72, and the two ends of the spring 73 are respectively connected to the inner wall of the slide groove and the corresponding side of the connecting plate 5.

[0049] like Figure 6 As shown, a plurality of movable grooves 83 corresponding to the movable plate 71 are opened in the connecting sleeve 3, and the movable plate 71 is slidably connected in the movable groove 83, and a shock absorbing component 2 8 is provided in the movable groove 83;

[0050] The second shock absorbing assembly 8 includes a second damping telescopic rod 81 and a second spring 82 . The fixed end of the second damping telescopic rod 81 is connected to the inner wall of the corresponding moving groove 83 , and the movable end of the second damping telescopic rod 81 is connected to the corresponding moving plate 71 .

[0051] like Figure 6 As shown, a movable component 6 is provided between several connecting plates 5 and the outer peripheral surface of the inner sleeve 41. The movable component 6 includes a fixed block 61 and a hinge component. The fixed block 61 is connected to the outer peripheral surface of the inner sleeve 41, and the fixed block 61 and the connecting plates 5 are connected via a hinge component.

[0052] like Figure 6As shown, the hinge component includes a hinge shaft 63 and a hinge plate 62. The hinge plate 62 is connected to the connecting plate 5. The hinge shaft 63 is arranged on the fixed block 61. A circular hole is opened in the hinge plate 62. The hinge plate 62 is movably sleeved on the outside of the hinge shaft 63. The hinge shaft 63 is located inside the circular hole and there is a gap between it and the circular hole.

[0053] The working principle of this embodiment is as follows:

[0054] The entire axial flow fan is divided into three layers. The outermost layer is the fixed shell 1, the middle layer is the connecting sleeve 3, and the inner layer is the inner sleeve 41. The middle layer is connected to the inner sleeve 41, directly playing a role in reducing vibration and noise for the inner sleeve 41. The connecting sleeve 3 is inserted into the fixed shell 1. The fixed shell 1 supports and fixes the connecting sleeve 3 and the inner sleeve 41, and plays an auxiliary role in reducing vibration and noise.

[0055] The inner sleeve 41 is provided with the main driving components of the axial flow fan, which are used to install the bracket 43 for placing the drive motor 42 and the fan 44 connected to the drive motor 42. This part is prior art and will not be described in detail here.

[0056] The inner sleeve 41 is affected by the fan 44 and the drive motor 42 and will vibrate. The inner sleeve 41 is directly fixedly connected to the external fixed housing 1, which will lead to aggravated vibration. Therefore, the connecting sleeve 3 is provided as an intermediate layer. The inner sleeve 41 and the connecting sleeve 3 directly achieve the effect of vibration reduction and noise reduction through multiple shock-absorbing components. Under the influence of various factors in the fan 44 and the drive motor 42, the inner sleeve 41 will exhibit various vibration modes including longitudinal, horizontal, axial and rotational deflection.

[0057] The vibration in the axial direction causes the position of the inner sleeve 41 to shake, and at the same time, the connecting plate 5 connected to the outer circumference of the inner sleeve 41 shakes, and the position of the connecting plate 5 under the shaking is offset, which squeezes the damping telescopic rod 2 81 and the spring 2 82 corresponding to the shaking direction. The damping telescopic rod 2 81 and the spring 2 82 absorb and disperse the energy generated by the vibration, and generate a reaction force through their own characteristics to push the connecting plate 5 to reset, thereby playing a role in shock absorption and noise reduction. At the same time, a limiting groove is provided in the movable plate 71, and a limiting block is provided at the bottom of the connecting plate 5. When the connecting plate 5 moves, it drives the limiting block to slide in the limiting groove, thereby improving the stability of the connecting plate 5.

[0058] Vibration in both the horizontal and longitudinal directions will cause the inner sleeve 41 to drive the connecting plate 5 to deflect in one of the upward, downward, left, and right directions, thereby applying force to the corresponding shock-absorbing component 1 7. The specific process is that after the connecting plate 5 deflects, it drives the entire movable plate 71 to move in the movable groove 83. After the movable plate 71 moves, it squeezes the damping telescopic rod 1 72 and the spring 1 73. The damping telescopic rod 1 72 and the spring 1 73 perform shock-absorbing treatment in this direction, which is the same as the effect of the damping telescopic rod 2 81 and the spring 2 82. The damping telescopic rod 1 72 and the spring 1 73 in the movable plate 71 cooperate with the damping telescopic rod 2 81 and the spring 2 82 to achieve shock-absorbing treatment for the combined vibration in the axial, horizontal and longitudinal directions, which is more comprehensive in use.

[0059] On this basis, a movable component 6 is also provided. At this time, the connecting plate 5 is not directly connected to the outer peripheral surface of the inner sleeve 41, but the inner sleeve 41 is docked with the connecting plate 5 through the movable component 6. The fixed block 61 in the movable component 6 is connected to the inner sleeve 41. A hinge shaft 63 is provided in the fixed block 61. A hinge plate 62 is connected to the connecting plate 5, which is connected to the hinge shaft 63 through the hinge plate 62. The hinge shaft 63 is located in the circular hole in the hinge plate 62. There is a gap between the circular hole and the hinge shaft 63. The setting of the movable component 6 realizes that the inner sleeve 41 generates a complex vibration mode. At the same time, it is more flexible in movement and is not easy to break with the connecting plate 5, and multiple independent shock-absorbing components are connected. When one of the shock-absorbing components is under force, the other shock-absorbing components will also be under force, thus achieving the effect of dispersing vibration and jointly processing, with better shock absorption effect and faster feedback. At the same time, due to the gap between the hinge shaft 63 and the circular hole, the outer sleeve also has a certain amount of room for movement when it produces rotational deflection. The setting of the gap does not need to be too large to affect the supporting effect. The rotational deflection amplitude of the inner sleeve 41 is small, and excessive swing amplitude requires maintenance.

[0060] Example 2

[0061] like Figure 4 As shown, this embodiment further includes the following structure based on the first embodiment: the inner wall of the inner sleeve 41 is provided with installation grooves 31 arranged at intervals, and a sound-absorbing sponge pad 33 is provided in the installation groove 31.

[0062] like Figure 1 As shown, mesh protection plates 2 are installed at both ends of the inner sleeve 41.

[0063] like Figure 3 、 Figure 7 As shown, the fixed housing 1 is divided into an upper fixed housing 11 and a lower fixed housing 12, and the upper fixed housing 11 and the lower fixed housing 12 are detachably connected;

[0064] Two grooves 13 are defined in both the upper fixed shell 11 and the lower fixed shell 12 . Two protrusions 32 facing the grooves 13 are provided on the outer circumference of the connecting sleeve 3 . The protrusions 32 are inserted into the grooves 13 .

[0065] like Figure 7 As shown, a rubber pad 16 is provided inside the groove 13 .

[0066] like Figure 7 As shown, a placement groove 14 is provided in the upper fixing shell 11 and the lower fixing shell 12 , and a sound-absorbing sponge pad 15 is provided in the placement groove 14 .

[0067] The working principle of this embodiment is as follows:

[0068] A plurality of mounting grooves 31 are provided in the inner sleeve 41, and a sound-absorbing sponge pad 33 is provided in the mounting groove 31. The sound-absorbing sponge pad 33 directly acts on the inner sleeve 41 to mainly reduce the noise generated in the inner sleeve 41.

[0069] The inner sleeve 41 and the connecting sleeve 3 are connected to each other as a whole through the movable component 6, the shock-absorbing component 1 7 and the shock-absorbing component 2 8 in the first embodiment. The fixed outer shell 1 is divided into two parts, the upper fixed shell 11 and the lower fixed shell 12. During installation, the assembled connecting sleeve 3 is placed in the lower fixed shell 12, and then the upper fixed shell 11 is covered. Finally, the upper fixed shell 11 and the lower fixed shell 12 are connected by fixing parts such as bolts to complete the overall assembly. In this process, the protrusions 32 on the outer circumference of the connecting sleeve 3 will be inserted into the grooves 13 in the upper fixed shell 11 and the lower fixed shell 12 to achieve docking.

[0070] A rubber pad 16 is provided inside the groove 13. When the protrusion 32 is inserted into the groove 13, the rubber pad 16 is squeezed, thereby achieving better fixation. At the same time, the rubber pad 16 is made of elastic material. During the installation process, the rubber pad 16 has a certain amount of shrinkage space under the squeezing of the protrusion 32. When the connecting sleeve 3 cannot fully handle the vibration generated in the inner sleeve 41, the connecting sleeve 3 itself will also be affected by the vibration. At this time, the slight vibration of the connecting sleeve 3 will squeeze the rubber pad 16, and the rubber pad 16 will play a shock-absorbing role.

[0071] At the same time, a placement groove 14 is opened in the upper fixed shell 11 and the lower fixed shell 12, and a sound-absorbing sponge pad 2 15 is arranged in the placement groove 14. The sound-absorbing sponge pad 2 15 has the same function as the sound-absorbing sponge pad 1 33. The difference is that the sound-absorbing sponge pad 2 15 is the last step to deal with the noise that the sound-absorbing sponge pad 1 33 cannot handle. The two work together to achieve a double noise reduction effect.

[0072] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Axial flow fan with vibration and noise reduction, characterized by: include: Fixed housing (1); A fan body (4), the fan body (4) comprising an inner sleeve (41), a drive motor (42), a bracket (43) and a fan (44), the bracket (43) being fixed to the inner wall of the inner sleeve (41), the drive motor (42) being mounted on the bracket (43), and the drive motor (42) being connected to the fan (44) so ​​as to drive the fan (44) to rotate inside the inner sleeve (41); A connecting sleeve (3) is inserted into the fixed housing (1), and a plurality of shock absorbing components (7) are provided in the connecting sleeve (3). The shock absorbing components (7) include a movable plate (71), a connecting plate (5), and two shock absorbing components. A sliding groove is provided in the movable plate (71), and the connecting plate (5) is slidably connected in the sliding groove. The two shock absorbing components are respectively connected to one side of the connecting plate (5) and the inner wall of the sliding groove corresponding to the side. The outer peripheral surface of the inner sleeve (41) is connected to the corresponding connecting plates (5) in the plurality of shock absorbing assemblies (7). The inner sleeve (41) generates axial shaking to drive the connecting plates (5) to synchronously generate positional displacement to squeeze the shock absorbing component. The shock absorbing component is suitable for driving the connecting plates (5) to reset when squeezed by the connecting plates (5).

2. The vibration-reducing and noise-reducing axial flow fan according to claim 1, characterized in that: The shock absorbing component includes a damping telescopic rod (72) and a spring (73), wherein the fixed end of the damping telescopic rod (72) is connected to the inner wall of the slide groove, and the movable end of the damping telescopic rod (72) is connected to the corresponding side of the connecting plate (5). The spring (73) is sleeved on the outside of the damping telescopic rod (72), and the two ends of the spring (73) are respectively connected to the inner wall of the slide groove and the corresponding side of the connecting plate (5).

3. The vibration-reducing and noise-reducing axial flow fan according to claim 2, characterized in that: A plurality of movable grooves (83) corresponding to the movable plate (71) are provided in the connecting sleeve (3); the movable plate (71) is slidably connected in the movable grooves (83); and a second shock absorbing component (8) is provided in the movable grooves (83); The second shock absorbing assembly (8) includes a second damping telescopic rod (81) and a second spring (82), wherein the fixed end of the second damping telescopic rod (81) is connected to the inner wall of the corresponding movable groove (83), and the movable end of the second damping telescopic rod (81) is connected to the corresponding movable plate (71).

4. The vibration-reducing and noise-reducing axial flow fan according to claim 2 or 3, characterized in that: A movable assembly (6) is provided between the plurality of connecting plates (5) and the outer peripheral surface of the inner sleeve (41), and the movable assembly (6) comprises a fixed block (61) and a hinge component. The fixed block (61) is connected to the outer peripheral surface of the inner sleeve (41), and the fixed block (61) and the connecting plates (5) are connected via a hinge component.

5. The vibration-reducing and noise-reducing axial flow fan according to claim 4, characterized in that: The hinge component includes a hinge shaft (63) and a hinge plate (62), wherein the hinge plate (62) is connected to the connecting plate (5), the hinge shaft (63) is arranged on the fixed block (61), a circular hole is provided in the hinge plate (62), the hinge plate (62) is movably sleeved on the outside of the hinge shaft (63), and the hinge shaft (63) is located inside the circular hole and there is a gap between the hinge shaft (63) and the circular hole.

6. The vibration-reducing and noise-reducing axial flow fan according to claim 1, characterized in that: The inner wall of the inner sleeve (41) is provided with installation grooves (31) arranged at intervals, and a sound-absorbing sponge pad (33) is arranged in the installation groove (31).

7. The vibration-reducing and noise-reducing axial flow fan according to claim 1, characterized in that: Grid protection plates (2) are installed at both ends of the inner sleeve (41).

8. The vibration-reducing and noise-reducing axial flow fan according to claim 1, characterized in that: The fixed housing (1) is divided into an upper fixed housing (11) and a lower fixed housing (12), and the upper fixed housing (11) and the lower fixed housing (12) are detachably connected; Two grooves (13) are provided in both the upper fixed shell (11) and the lower fixed shell (12); two protrusions (32) are provided on the outer peripheral surface of the connecting sleeve (3) and are positioned opposite to the grooves (13); the protrusions (32) are inserted into the interior of the grooves (13).

9. The vibration-reducing and noise-reducing axial flow fan according to claim 8, characterized in that: A rubber pad (16) is provided inside the groove (13).

10. The vibration-reducing and noise-reducing axial flow fan according to claim 8 or 9, characterized in that: A placement groove (14) is provided in both the upper fixed shell (11) and the lower fixed shell (12), and a second sound-absorbing sponge pad (15) is provided in the placement groove (14).

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