A fan vibration reduction device

Abstract

The present invention proposes a fan vibration reduction device, including a vibration reduction unit, a first machine foot plate and a second machine foot plate which are parallel to each other; the vibration reduction unit includes at least three layers of coaxial vibration reduction cylinders and a plurality of connecting rings, the end faces of two adjacent layers of vibration reduction cylinders are connected by a connecting ring, and the two adjacent connecting rings are respectively connected to the two end faces of the same vibration reduction cylinder; the first machine foot plate is connected to the innermost layer of the vibration reduction cylinder and is located outside the innermost layer of the vibration reduction cylinder, and is used to install the fan; the second machine foot plate is connected to the outermost layer of the vibration reduction cylinder and is located outside the outermost layer of the vibration reduction cylinder, and is used to connect the installation platform. The fan vibration is transmitted from the first machine foot plate to the innermost layer of the vibration reduction cylinder, and then from the inside to the outside to the outermost layer of the vibration reduction cylinder and then to the second machine foot plate. Under the vibration reduction device of the same height, the vibration transmission path can be expanded by more than three times, which has a better effect on the energy consumption and attenuation of low-frequency vibration, can make full use of the longitudinal space, and improve the applicability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction devices, and in particular to a fan vibration reduction device. Background Art

[0002] The fan is a typical vibrating device. The vibration generated by the interaction between the fan impeller and the air, the fluid-solid coupling excitation of the fan housing, and the vibration of the motor rotor system inside the fan together cause the vibration of the fan, which is ultimately transmitted to the mounting structure through the fan mounting foot plate. When the fan power is large, the fan vibration will cause adverse consequences such as fatigue fracture of the platform material, loosening or fracture of fasteners, and resonance of the platform structure. In the field of precision processing or precision measurement such as chip manufacturing, infrared or ultraviolet spectroscopy gas analysis, the fan vibration will directly affect the processing accuracy or the measurement accuracy of precision instruments.

[0003] In view of the above problems, the utility model patent with publication number CN204755413 U in the prior art discloses a fan shock absorbing device, which can effectively block the vibration energy transmission path by designing that the shock absorbing element is located between the first metal part and the second metal part and can absorb vibration energy itself.

[0004] However, in this patent, the shock absorbing element can effectively attenuate the high-frequency part of the vibration, but the effect on the low-frequency part of the vibration is very limited. Summary of the invention

[0005] In view of this, the present invention proposes a fan vibration reduction device to solve the technical problem that the shock absorbing element proposed in the above background technology can well attenuate the high-frequency part of the vibration, but has very limited effect on the low-frequency part of the vibration.

[0006] The technical solution of the present invention is achieved in this way:

[0007] The present invention provides a fan vibration reduction device, comprising a vibration reduction unit, a first machine foot plate and a second machine foot plate parallel to each other, wherein:

[0008] The vibration reduction unit comprises at least three layers of coaxial vibration reduction cylinders and a plurality of connecting rings, the end faces of two adjacent layers of vibration reduction cylinders are connected by a connecting ring, and the two connecting rings connected to the same vibration reduction cylinder are staggered along the axis direction of the vibration reduction cylinder, so that the vibration reduction unit forms a rotating labyrinth structure;

[0009] The first machine foot plate is connected to the innermost vibration damping cylinder and is located outside the innermost vibration damping cylinder, and is used for installing the fan;

[0010] The second machine foot plate is connected to the outermost vibration-damping cylinder and is located outside the outermost vibration-damping cylinder, and is used for connecting to the mounting platform.

[0011] On the basis of the above technical solution, preferably, the first machine foot plate and the second machine foot plate are both annular structures, the first machine foot plate is provided with a plurality of first mounting holes along the circumferential direction, and the second machine foot plate is provided with a plurality of second mounting holes along the circumferential direction.

[0012] On the basis of the above technical solution, preferably, the fan includes a cylinder, a motor and an impeller, the outer wall of the cylinder is provided with a coaxial third machine foot plate, the vibration damping cylinder is sleeved outside the cylinder, and the third machine foot plate is provided with a third mounting hole matching the first mounting hole, the motor is installed in the cylinder and connected to the impeller, and the output shaft of the motor is coaxial with the vibration damping cylinder.

[0013] On the basis of the above technical solution, preferably, the outer diameter of the first machine foot plate is d1, and the number n of the vibration damping cylinders is an odd number; when d1<300mm, n≥3; when d1≥300mm, n≥d1 / 100, and n is an integer.

[0014] On the basis of the above technical solution, preferably, the outer diameter of the outermost vibration damping cylinder is d2, 0.9d1≤d2≤1.1d1.

[0015] On the basis of the above technical scheme, preferably, the wall thickness of the vibration damping cylinder of the middle layer between the outermost layer and the innermost layer is y2; when d1<500mm, y2≥3mm; when d1≥500mm, y2≥0.6%d1; the wall thickness of the vibration damping cylinder of the outermost layer is y1≥2y2; the wall thickness of the vibration damping cylinder of the innermost layer is y3≥1.2y2.

[0016] On the basis of the above technical solution, preferably, the thickness of the connecting ring z1≥y3.

[0017] On the basis of the above technical solution, preferably, the spacing x1 between two adjacent layers of vibration-damping cylinders is ≥5 mm.

[0018] On the basis of the above technical solution, preferably, the maximum height of the fan vibration reduction device is z2, 0.3d1≤z2≤0.5d1.

[0019] On the basis of the above technical solution, preferably, the roughness of the mounting surface of the first machine foot plate and the mounting surface of the second machine foot plate are both no greater than 6.3, and the parallelism of the two is less than or equal to 0.1.

[0020] The fan vibration reduction device and method of the present invention have the following beneficial effects compared with the prior art:

[0021] (1) The end faces of two adjacent layers of vibration damping cylinders are connected by a connecting ring, and the two adjacent connecting rings are respectively connected to the two end faces of the same vibration damping cylinder, so that the vibration damping unit forms a rotating labyrinth structure. The fan vibration is transmitted from the first machine foot plate to the innermost vibration damping cylinder, and then transmitted from the inside to the outside along the labyrinth structure to the outermost vibration damping cylinder and then to the second machine foot plate. Under the same height of the vibration damping device, the vibration transmission path can be expanded by more than three times, which has a good effect on the energy consumption and attenuation of low-frequency vibration. In addition, when it is in an installation environment with limited height, the height of the vibration damping device can be made as short as possible, so that the longitudinal space can be fully utilized and the applicability of the device can be improved;

[0022] (2) The first machine foot plate and the second machine foot plate are both annular structures. Compared with the traditional fan structure in which a local welded boss is used as the mounting structure, the mounting surface contact area is increased. The mounting surface is symmetrical with the entire fan axis, which is conducive to improving the stability and rigidity of the installation and can prevent the fan vibration from being amplified at the installation position.

[0023] (3) The fan includes a cylinder, a motor and an impeller, the outer wall of the cylinder is provided with a coaxial third machine foot plate, the motor is installed in the cylinder and connected to the impeller, the output shaft of the motor is coaxial with the vibration damping cylinder, the vibration damping device as a whole is axially symmetrical with respect to the output shaft of the motor of the fan, the integrity is better, and the installation stability is improved; the vibration damping cylinder is sleeved outside the cylinder, which is equivalent to adding a circle of enclosure structure to the inlet section of the cylinder, which occupies a small installation space, has a compact structure, and is light in weight;

[0024] (4) The outer diameter of the first machine foot plate is d1, and the number n of the vibration damping cylinders is an odd number; when d1<300mm, n≥3; when d1≥300mm, n≥d1 / 100, and n is an integer; the number of vibration damping cylinders is subject to the above restrictions, so that the vibration transmission path is associated with the outer diameter of the first machine foot plate, ensuring that the fan vibration can be effectively attenuated, thereby improving the reliability and stability of the device;

[0025] (5) The outer diameter of the outermost vibration damping cylinder is d2, 0.9d1≤d2≤1.1d1, which can ensure the stiffness of the vibration damping cylinder and the length of the vibration damping path, and avoid the vibration damping cylinder from being too protruding locally and affecting the installation of the first machine foot plate, thereby improving the adaptability;

[0026] (6) The wall thickness of the vibration damping cylinder of the middle layer between the outermost layer and the innermost layer is y2; when d1<500mm, y2≥3mm; when d1≥500mm, y2≥0.6%d1; the wall thickness of the vibration damping cylinder of the outermost layer is y1≥2y2; the wall thickness of the vibration damping cylinder of the innermost layer is y3≥1.2y2; through the above size restrictions, the support stiffness of each layer of vibration damping cylinder for the fan cylinder of different sizes is guaranteed, thereby improving the reliability and stability of the device;

[0027] (7) By ensuring that the thickness of the connecting ring z1≥y3, the rigidity of the connecting ring and the strength of the connection meet the requirements, thereby improving the reliability and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a cross-sectional view of a fan vibration reduction device in an embodiment of the present invention;

[0030] Figure 2 In the embodiment of the present invention Figure 1 A partial schematic diagram of

[0031] Figure 3 is a cross-sectional view of a fan vibration reduction device (connecting a fan and a mounting platform) in an embodiment of the present invention;

[0032] Figure 4 is a top view of a fan vibration reduction device in an embodiment of the present invention;

[0033] Figure 5 In the embodiment of the present invention Figure 4 The EE section view in the figure is a schematic diagram of the tolerance dimension;

[0034] Figure 6 In the embodiment of the present invention Figure 4 The EE section view in the figure is a schematic diagram of the overall dimensions;

[0035] Figure 7 In the embodiment of the present invention Figure 6 Partial schematic Figure 1 ;

[0036] Figure 8 In the embodiment of the present invention Figure 6 Partial schematic Figure 2 .

[0037] Description of reference numerals: 1-vibration reduction unit, 2-first machine foot plate, 3-second machine foot plate;

[0038] 100-fan, 101-drum, 102-motor, 103-impeller, 104-third machine foot plate, 200-installation platform;

[0039] 11-vibration damping cylinder, 12-connecting ring;

[0040] 21-first mounting hole;

[0041] 31- Second mounting hole. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Reference Figure 1-8 As shown, an embodiment of the present invention provides a fan vibration reduction device, comprising a vibration reduction unit 1, a first machine foot plate 2 and a second machine foot plate 3 parallel to each other, wherein:

[0044] The vibration reduction unit 1 comprises at least three layers of coaxial vibration reduction cylinders 11 and a plurality of connecting rings 12. The end faces of two adjacent layers of vibration reduction cylinders 11 are connected by a connecting ring 12 to form a "J"-shaped structure. Two adjacent connecting rings 12 are respectively connected to two end faces of the same vibration reduction cylinder 11. The vibration reduction unit forms a rotating labyrinth structure, thereby extending the vibration transmission path.

[0045] The first machine foot plate 2 is connected to the innermost vibration damping cylinder 11 and is located outside the innermost vibration damping cylinder 11, and is used to install the fan 100; the first machine foot plate 2 and the vibration damping cylinder 11 are coaxial, and the end surface of the first machine foot plate 2 is used to install the fan 100;

[0046] The second machine foot plate 3 is connected to the outermost vibration damping cylinder 11 and is located outside the outermost vibration damping cylinder 11, and is used to connect to the mounting platform 200. The second machine foot plate 3 and the vibration damping cylinder 11 are coaxial, and the end surface of the second machine foot plate 3 is used to connect to the mounting platform 200.

[0047] The vibration reduction unit 1, the first machine foot plate 2 and the second machine foot plate 3 can all be made of high-rigidity metal materials such as Q235B carbon steel, forged aluminum, titanium alloy, etc., which can effectively ensure the installation rigidity, avoid installation deformation or vibration torsion, and improve reliability and stability.

[0048] In this embodiment, five layers of vibration-damping cylinders 11 are taken as an example. The two ends of the innermost layer of vibration-damping cylinder 11 are respectively connected to the first machine foot plate 2 and a connecting ring 12, the two ends of the outermost layer of vibration-damping cylinder 11 are respectively connected to the second machine foot plate 3 and a connecting ring 12, and the two end faces of the three-layer vibration-damping cylinder 11 in the middle layer are respectively connected to the connecting rings 12, thereby forming a maze structure formed by five layers of vibration-damping cylinders to expand the vibration transmission path by five times.

[0049] The fan vibration reduction device provided in this embodiment is connected by a connecting ring 12 between the end faces of two adjacent layers of vibration reduction cylinders 11, and the two adjacent connecting rings 12 are respectively connected to the two end faces of the same vibration reduction cylinder 11, and the vibration reduction unit 1 forms a rotating maze structure. The vibration of the fan 100 is transmitted from the first machine foot plate 2 to the innermost vibration reduction cylinder 11, and is transmitted from the inside to the outside along the maze structure to the outermost vibration reduction cylinder 11 and then to the second machine foot plate 3. Under the same height of the vibration reduction device, the vibration transmission path can be expanded by more than three times, which has a better effect on the energy consumption and attenuation of low-frequency vibrations. In addition, when it is in a height-restricted installation environment, the height of the vibration reduction device can be made as short as possible, and the longitudinal space can be fully utilized to improve the applicability of the device.

[0050] In some embodiments, the first machine foot plate 2 and the second machine foot plate 3 are both annular structures, the first machine foot plate 2 is provided with a plurality of first mounting holes 21 along the circumferential direction, and the second machine foot plate 3 is provided with a plurality of second mounting holes 31 along the circumferential direction. Since the first machine foot plate 2 and the second machine foot plate 3 are both annular structures, compared with the traditional fan 100 which uses a local welding boss as a mounting structure, the mounting surface contact area is increased, and the mounting surface is symmetrical with the entire fan 100 axis, which is conducive to improving the stability and rigidity of the installation, and can prevent the fan 100 vibration from being amplified at the installation position.

[0051] In some embodiments, the fan 100 includes a cylinder 101, a motor 102 and an impeller 103. The outer wall of the cylinder 101 is provided with a coaxial third machine foot plate 104. The vibration damping cylinder 11 is sleeved outside the cylinder 101. The third machine foot plate 104 is provided with a third mounting hole matching the first mounting hole 21. The bolt passes through the first mounting hole 21 and the third mounting hole and is connected and fixed with a nut. The motor 102 is installed in the cylinder 101 and connected to the impeller 103. The output shaft of the motor 102 is coaxial with the vibration damping cylinder 11. The fan 100 includes a cylinder 101, a motor 102 and an impeller 103. The outer wall of the cylinder 101 is provided with a coaxial third machine foot plate 104. The motor 102 is installed in the cylinder 101 and connected to the impeller 103. The output shaft of the motor 102 is coaxial with the vibration damping cylinder 11. The vibration damping device as a whole is axially symmetrical with respect to the output shaft of the motor 102 of the fan 100, has better integrity, and improves the stability of installation. The vibration damping cylinder 11 is sleeved outside the cylinder 101, which is equivalent to adding a circle of enclosure structure to the inlet section of the cylinder 101, which occupies a small installation space, has a compact structure, and is light in weight.

[0052] In some embodiments, the outer diameter of the first machine foot plate 2 is d1, and the number n of the vibration damping cylinders 11 is an odd number; when d1<300mm, n≥3; when d1≥300mm, n≥d1 / 100, and n is an integer. The outer diameter of the first machine foot plate 2 is d1, and the number n of the vibration damping cylinders 11 is an odd number; when d1<300mm, n≥3; when d1≥300mm, n≥d1 / 100, and n is an integer; the outer diameter of the first machine foot plate 2 is associated with the size of the fan 100 and the rated power of the motor 102 of the fan 100, and the number of vibration damping cylinders 11 is subject to the above restrictions, so that the vibration transmission path is associated with the outer diameter of the first machine foot plate 2, ensuring that the vibration of the fan 100 can be effectively attenuated, thereby improving the reliability and stability of the device.

[0053] In some embodiments, the outer diameter of the outermost vibration damping cylinder 11 is d2, 0.9d1≤d2≤1.1d1. The above size restrictions can ensure the rigidity of the vibration damping cylinder 11 and the length of the vibration damping path, and prevent the vibration damping cylinder 11 from being too protruding locally and affecting the installation of the first machine foot plate 2, thereby improving the adaptability.

[0054] In some embodiments, the diameter of the center circle where the centers of the multiple first mounting holes 21 are located is d3, (d1-d3) ≥ 15mm, ensuring that the outer side of the first mounting hole 21 has sufficient strength to avoid failure of the bolt connection during vibration; the outer circle diameter of the second machine foot plate 3 is d4, and the diameter of the center circle where the centers of the multiple second mounting holes 31 are located is d5, (d4-d5) ≥ 15mm, ensuring that the outer side of the second mounting hole 31 has sufficient strength to avoid failure of the bolt connection during vibration, thereby improving the reliability of the device. d5 matches the center circle diameter of the bolt hole group of the mounting platform 200. In actual design, the bolt holes of the mounting platform 200 can be drilled according to the second mounting holes 31 of the vibration reduction device.

[0055] In some embodiments, the inner diameter of the innermost vibration damping cylinder 11 is d6, and the diameter of the air inlet of the cylinder 101 of the fan 100 is d7, d6≥d7, so that the vibration damping unit 1 can be entirely mounted on the outside of the fan 100, occupying a small installation space, having a compact structure, and facilitating a flexible layout for installation.

[0056] In some embodiments, the wall thickness of the vibration damping cylinder 11 of the middle layer between the outermost layer and the innermost layer is y2; when d1<500mm, y2≥3mm; when d1≥500mm, y2≥0.6%d1; the wall thickness of the vibration damping cylinder 11 of the outermost layer is y1≥2y2; the wall thickness of the vibration damping cylinder 11 of the innermost layer is y3≥1.2y2. Through the above size restrictions, the support stiffness of each layer of the vibration damping cylinder 11 for the cylinder 101 of the fan 100 of different sizes is guaranteed, and the reliability and stability of the device are improved.

[0057] In some embodiments, the thickness z1 of the connecting ring 12 is ≥ y3. By setting the thickness z1 of the connecting ring 12 to be ≥ y3, it is ensured that the rigidity of the connecting ring 12 and the strength of the connection meet the requirements, thereby improving the reliability and stability of the device.

[0058] In some embodiments, the maximum height of the fan vibration reduction device is z2, 0.3d1≤z2≤0.5d1. Through the above size restrictions, the height of the fan vibration reduction device and the number of vibration reduction cylinders 11 are balanced, and the height of the fan vibration reduction device is as small as possible while meeting the length requirement of the vibration transmission path, so as to meet the environment with limited height space and improve the applicability of the device.

[0059] In some embodiments, the thickness of the first machine foot plate 2 is z3, the thickness of the second machine foot plate 3 is z4, z3≥5mm, z4≥5mm. By setting the thickness of the first machine foot plate 2 and the second machine foot plate 3 as above, the first machine foot plate 2 and the second machine foot plate 3 meet the installation stiffness requirements and improve the reliability of the device.

[0060] In some embodiments, the minimum distance from the end of the innermost vibration-damping cylinder 11 to the second machine foot plate 3 is z5, z5 ≥ 5 mm, and z5 cannot be too small, otherwise the innermost vibration-damping cylinder 11 will collide with the mounting platform 200 when vibrating, which will have an amplifying effect on the vibration. The above setting can improve the reliability of the device.

[0061] In some embodiments, the spacing x1 between two adjacent layers of vibration-damping cylinders 11 is ≥5 mm. x1 cannot be too small, otherwise the vibration-damping cylinders 11 of the inner layer will collide with each other when vibrating, which will have an amplifying effect on the vibration. When z2>150 mm, it is recommended to set x1≥7 mm to improve the reliability and stability of the device.

[0062] In some embodiments, the roughness of the mounting surface of the first machine foot plate 2 and the mounting surface of the second machine foot plate 3 are both no greater than 6.3, and the parallelism of the two is less than or equal to 0.1. The above settings can ensure the accuracy of assembly, further reduce the vibration caused by insufficient machining technology, reduce vibration, and improve the reliability of the device.

[0063] In some embodiments, the position tolerance of the second mounting hole 31 relative to the A surface is controlled within Φ0.1mm, the position tolerance of the first mounting hole 21 relative to the B surface is controlled within Φ0.1mm, and the parallelism tolerance of the B surface and the A surface is controlled within 0.1mm. The above settings can further improve the assembly accuracy, thereby reducing the vibration caused by insufficient machining technology, reducing vibration, and improving the reliability of the device.

[0064] The working principle of the fan vibration reduction device provided in this embodiment is: the fan 100 is installed on the first machine foot plate 2, the first machine foot plate 2 is fixedly connected to the mounting platform 200, the end faces of two adjacent layers of vibration reduction cylinders 11 are connected by a connecting ring 12, and the two adjacent connecting rings 12 are respectively connected to the two end faces of the same vibration reduction cylinder 11, and the vibration reduction unit 1 forms a rotating maze structure. The vibration of the fan 100 is transmitted from the first machine foot plate 2 to the innermost layer of the vibration reduction cylinder 11, and is transmitted from the inside to the outside along the maze structure to the outermost layer of the vibration reduction cylinder 11 and then to the second machine foot plate 3. Under the same height of the vibration reduction device, the vibration transmission path can be expanded by more than three times, which has a better effect on the energy consumption and attenuation of low-frequency vibration. In addition, when it is in a height-restricted installation environment, the height of the vibration reduction device can be made as short as possible, and the longitudinal space can be fully utilized to improve the applicability of the device.

[0065] The above description is only a preferred embodiment of the present invention and is 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 protection scope of the present invention.

Claims

1. A fan vibration reduction device, characterized in that: It comprises a vibration reduction unit (1), a first machine foot plate (2) and a second machine foot plate (3) which are parallel to each other, wherein: The vibration reduction unit (1) comprises at least three layers of coaxial vibration reduction cylinders (11) and a plurality of connecting rings (12); the end surfaces of two adjacent layers of vibration reduction cylinders (11) are connected via a connecting ring (12); and the two connecting rings (12) connected to the same vibration reduction cylinder (11) are staggeredly arranged along the axial direction of the vibration reduction cylinder (11), so that the vibration reduction unit (1) forms a rotating labyrinth structure; The first machine foot plate (2) is connected to the innermost vibration damping cylinder (11) and is located outside the innermost vibration damping cylinder (11) and is used for installing the fan (100); The second machine foot plate (3) is connected to the outermost vibration-damping cylinder (11) and is located outside the outermost vibration-damping cylinder (11), and is used for connecting to the mounting platform (200).

2. The fan vibration reduction device according to claim 1, characterized in that: The first machine foot plate (2) and the second machine foot plate (3) are both annular structures; the first machine foot plate (2) is provided with a plurality of first mounting holes (21) along the circumferential direction; and the second machine foot plate (3) is provided with a plurality of second mounting holes (31) along the circumferential direction.

3. The fan vibration reduction device according to claim 2, characterized in that: The fan (100) comprises a cylinder (101), a motor (102) and an impeller (103); the outer wall of the cylinder (101) is provided with a coaxial third machine foot plate (104); the vibration damping cylinder (11) is sleeved outside the cylinder (101); the third machine foot plate (104) is provided with a third mounting hole matching the first mounting hole (21); the motor (102) is installed in the cylinder (101) and connected to the impeller (103); the output shaft of the motor (102) is coaxial with the vibration damping cylinder (11).

4. The fan vibration reduction device according to claim 1, characterized in that: The outer diameter of the first machine foot plate (2) is d1, and the number n of the vibration-damping cylinders (11) is an odd number; when d1<300 mm, n≥3; when d1≥300 mm, n≥d1 / 100, and n is an integer.

5. The fan vibration reduction device according to claim 4, characterized in that: The outer diameter of the outermost vibration damping cylinder (11) is d2, 0.9d1≤d2≤1.1d1.

6. The fan vibration reduction device according to claim 5, characterized in that: The wall thickness of the vibration damping cylinder (11) of the middle layer between the outermost layer and the innermost layer is y2; when d1<500mm, y2≥3mm; when d1≥500mm, y2≥0.6%d1; the wall thickness of the vibration damping cylinder (11) of the outermost layer is y1≥2y2; the wall thickness of the vibration damping cylinder (11) of the innermost layer is y3≥1.2y2.

7. The fan vibration reduction device according to claim 6, characterized in that: The thickness of the connecting ring (12) is z1≥y3.

8. The fan vibration reduction device according to claim 7, characterized in that: The spacing x1 between two adjacent layers of vibration damping cylinders (11) is ≥5 mm.

9. The fan vibration reduction device according to claim 8, characterized in that: The maximum height of the fan vibration reduction device is z2, 0.3d1≤z2≤0.5d1.

Images