CN110821760B - Spherical liquid vibration damper suitable for fan blade and mounting method - Google Patents
Spherical liquid vibration damper suitable for fan blade and mounting method Download PDFInfo
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- CN110821760B CN110821760B CN201911154369.7A CN201911154369A CN110821760B CN 110821760 B CN110821760 B CN 110821760B CN 201911154369 A CN201911154369 A CN 201911154369A CN 110821760 B CN110821760 B CN 110821760B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
- F16F15/167—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material having an inertia member, e.g. ring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
A spherical liquid vibration damper suitable for fan blades comprises a spherical mass block, a clip-shaped fixing plate, a shape memory alloy spring, a combination piece and a fiber rope. By adopting the ultra-high molecular weight polyethylene fiber rope, 3 spherical mass blocks with sequentially increased diameters are connected in series inside the fan blade from top to bottom, the periphery of each spherical mass block is fixed on a clip-shaped fixing plate designed on the inner side of the fan blade through a shape memory alloy spring, and 1/2 high-density liquid and 1/2 full-carbon aerogel are filled in each spherical mass block. The blade vibrates to drive the spherical mass block to vibrate from top to bottom in sequence, the acting force opposite to external excitation is generated to reduce the vibration of the main structure, meanwhile, when the spherical mass block vibrates, liquid in the shell is compressed and pushes the high-elasticity all-carbon aerogel to rotate around the spherical center under the action of inertia force, so that the gravity center of the spherical mass block always moves to the direction opposite to the blade vibration, the acting force opposite to the external excitation is increased, and the vibration reduction effect is improved.
Description
Technical Field
The invention relates to a fan structure vibration reduction control technology, in particular to a spherical liquid vibration reduction technology suitable for fan blades.
Background
The wind power generator enters the early stage of commercial development, and the development of the impeller technology matched with the wind power generator is very rapid. The wind wheel of the wind driven generator is the most main part for receiving wind energy, and is the most basic and most core part in the wind driven generator, wherein good design, feasible quality and superior performance are the determining factors for ensuring the normal and stable operation of the unit. The blade is taken as a key part of the fan, the stress of the blade is complex, the blade is subjected to the coupling effect of aerodynamic force, elastic force and inertia force in the rotating process, and along with the rapid development of the fan industry, the flexibility of the fan blade is continuously increased, so that the blade is easy to generate multidirectional irregular vibration. Repeated severe vibration can accelerate fatigue of the blade material, reduce the effective life of the blade material, and even cause fracture of the blade, thereby causing great economic loss. Therefore, control of fan blade vibration is becoming increasingly important.
The damping control technology is mature day by day and widely applied to various fields such as building structures, mechanical equipment, ship bridges, aerospace navigation and the like. The Tuned Mass Damper (TMD) belongs to one of passive Tuned damping control devices in dynamic vibration absorption, and reduces vibration of a main system by adding a subsystem on the main system to transfer or dissipate vibration energy on the main system. The vibration reduction performance of the tuned mass damper lies in accurate frequency modulation, the natural vibration frequency on the damper is close to the main structure rate, and an acting force opposite to external excitation is generated on the main structure through the strong vibration of the sub-structure, so that the vibration of the main structure is reduced. Based on the characteristics of convenient design, simple connection, excellent vibration damping performance and the like of the tuned mass damper, the spherical liquid vibration damping device suitable for the fan blade and the installation method are provided from the aspects of reducing the vibration of the fan blade and improving the yield of the fan.
Disclosure of Invention
The invention aims to provide a spherical liquid vibration damper suitable for a fan blade and an installation method.
The invention is a spherical liquid vibration damper and mounting method suitable for fan blade, the spherical liquid vibration damper suitable for fan blade, including spherical mass block, clip-shaped fixed plate 9, shape memory alloy spring 10, the assembly and fibrous rope, the said spherical mass block has 3 that the diameter increases sequentially from top to bottom, namely spherical mass No. 13, spherical mass No. 2 4, spherical mass No. 3 5, each spherical mass block is made up of hollow spherical shell 41, all carbon aerogel 44 and high-density liquid 42, wherein all carbon aerogel 44 is packed and loaded in the hollow of the hollow spherical shell 41 with the elastic waterproof material 43, account for 1/2 of the hollow volume, the remaining 1/2 hollow volume is packed into high-density liquid 42; the clip-shaped fixing plates 9 are provided with 3 blocks which correspond to the 3 spherical mass blocks one by one and are adhered to the inner surfaces of the blades 12, and four surfaces of each clip-shaped fixing plate 9 are connected with the corresponding spherical mass blocks through the shape memory alloy springs 10; the fiber ropes are synthesized by ultra-high molecular weight polyethylene fiber ropes and are divided into 4 synthesized by four strands and 3 synthesized by eight strands, wherein the 3 eight strands of ultra-high molecular weight polyethylene fiber ropes 2 are connected with the 3 spherical mass blocks in series at intervals through small aluminum sleeves 11, and the 4 four strands of ultra-high molecular weight polyethylene fiber ropes 6 are connected with the same position at the bottom of a No. 3 spherical mass block 5 with the largest diameter through a large aluminum sleeve 8; the assembly is divided into an A-type assembly 1 and a B-type assembly 7, wherein the A-type assembly 1 consists of a fixed base plate 14, a fixed support 15, a rotating support 16 and a connecting block 17, the fixed support 15 is welded on the fixed base plate 14, the rotating support 16 is connected in a longitudinal rotating groove of the fixed support 15 through a No. 1 bolt 13 and can rotate back and forth along the direction of the longitudinal rotating groove, and the connecting block 17 is connected in a transverse rotating groove of the rotating support 16 through the No. 1 bolt 13 and can rotate back and forth along the direction of the transverse rotating groove; wherein B class composite member 7 is equipped with 4, every all has by wedge PMKD 71, semi-cylinder fixing support 72, universal ball 73, screw 74 and screw rod 70 are constituteed, universal ball 73 card is in semi-cylinder fixing support 72, can rotate along arbitrary direction in semi-cylinder fixing support 72, and semi-cylinder fixing support 72 welds at wedge PMKD 71, through A class composite member 1 with eight strand ropes 2 of ultra high molecular weight polyethylene fibre and 12 apex inboards of fan blade are connected, through B class composite member 7 with four strand ropes 6 of ultra high molecular weight polyethylene fibre and 12 root inboards of fan blade are connected.
The invention discloses an installation method of a spherical liquid vibration damper suitable for fan blades, which comprises the following steps:
step (1): installing small aluminum sleeves 11 at the required ends of the 3 ultrahigh molecular weight polyethylene fiber eight-strand ropes 2, and welding the small aluminum sleeves at corresponding positions of the manufactured 3 spherical mass blocks;
step (2): adhering a fixed bottom plate 14 of the A-type assembly 1 to the blade tip part of the blade 12 by using an epoxy adhesive, and welding one end of the ultrahigh molecular weight polyethylene fiber eight-strand rope 2 connected in the step (1) to the upper surface of a connecting block 17 in the A-type assembly 1 through a small aluminum sleeve 11;
and (3): one ends of 4 ultrahigh molecular weight polyethylene fiber four-strand ropes 6 are respectively connected with 4 small aluminum sleeves 11, the other ends of the four-strand ropes are fixed together through 1 large aluminum sleeve 8, and the large aluminum sleeve 8 is welded at the bottom of a No. 3 spherical mass block 5 which is connected in series in the step (1) and has the largest diameter;
and (4): 4B-type combined members 7 are uniformly adhered by epoxy adhesive along the periphery of the inner surface of the root part of the blade 12;
and (5): simultaneously applying prestress on the 4 ultrahigh molecular weight polyethylene fiber four-strand ropes 6 connected in the step (3), respectively welding the four-strand ropes on the screw rods 70 of the 4B-type assemblies 7 through the small aluminum sleeves 11, and anchoring the screw rods 70 in corresponding screw holes of the corresponding B-type assemblies 7;
and (6): and adhering the clip-shaped fixing plates 9 corresponding to the spherical mass blocks one by one to the corresponding inner surfaces of the blades 12 by using epoxy adhesives, and welding the four surfaces of each spherical mass block and the four surfaces of the clip-shaped fixing plates 9 corresponding to the spherical mass blocks one by one through the shape memory alloy springs 10 to complete the installation of the whole spherical liquid vibration damper.
Compared with the prior art, the invention has the following advantages:
1. the natural vibration frequency of the spherical liquid vibration damper suitable for the fan blade can be adjusted by changing the diameter of the spherical mass block and the density of liquid in the spherical shell, so that the natural vibration frequency on the vibration damper is close to the main structure rate as much as possible.
2. The spherical liquid vibration damper suitable for the fan blade drives the spherical mass block to vibrate through the vibration of the blade, generates an acting force opposite to external excitation to reduce the vibration of a main structure, and meanwhile, when the spherical mass block vibrates, liquid in the shell is compressed and pushes the full carbon aerogel to rotate around the spherical center due to the action of inertia force, so that the gravity center of the spherical mass block always moves to the direction opposite to the vibration of the blade, the acting force opposite to the external excitation is increased, and the vibration damping effect of the vibration damper is improved.
3. The spherical liquid vibration damper suitable for the fan blade is made of light high-strength materials except for the spherical mass block, wherein the ultra-high molecular weight polyethylene fiber is about 40% lighter than aramid fiber and the like, the strength of the ultra-high molecular weight polyethylene fiber is about 14 times higher than that of steel wires, and the materials meet the design requirements and have small additional influence on the starting wind speed of the blade.
4. The spherical liquid vibration damper suitable for the fan blade is used in the rotating fan blade, the vertical vibration displacement of the spherical mass block is controlled by applying prestress on ultra-high molecular weight polyethylene fibers, and the liquid in the spherical shell is controlled to vibrate in the rotation of the blade by filling 1/2 of high-elasticity easily-recovered all-carbon aerogel in the spherical hollow, so that the accessory vibration effect of the rotation of the blade on the vibration damper is eliminated.
5. The spherical liquid vibration damper suitable for the fan blade is scientific in design, and reasonably utilizes the limited space and effective bearing capacity in the fan blade.
Drawings
Fig. 1 is a schematic diagram of a spherical liquid damper assembly suitable for a fan blade according to the present invention, fig. 2 is a sectional view from i to i of the spherical liquid damper assembly suitable for a fan blade according to the present invention, fig. 3 is a schematic diagram of a class B assembly of the spherical liquid damper assembly suitable for a fan blade according to the present invention, fig. 4 is a schematic diagram of a class a assembly of the spherical liquid damper assembly suitable for a fan blade according to the present invention, fig. 5 is a schematic diagram of an aluminum jacket of the spherical liquid damper assembly suitable for a fan blade according to the present invention, and reference numerals and corresponding names thereof are as follows: 1: class a assembly, 2: eight-strand ultrahigh molecular weight polyethylene fiber rope, 3: spherical mass block No. 1, 4: spherical mass block No. 2, 5: spherical mass block No. 3, 6: ultrahigh molecular weight polyethylene fiber four-strand rope, 7: class B assembly, 8: large aluminum sheath, 9: clip-shaped fixing plate, 10: shape memory alloy spring, 11: small aluminum sleeve, 12: fan blade, 13: bolt No. 1, 14: fixed base plate, 15: fixed support, 16: rotating support, 17: connecting block, 41: hollow spherical shell, 42: high density liquid, 43: elastic waterproof material, 44: all-carbon aerogel, 70: screw, 71: wedge-shaped fixing base plate, 72: semi-cylindrical ball type fixing support, 73: universal ball, 74: screw hole, 80: aluminum ferrule, 81: aluminum trepan boring, 82: aluminum sleeve, 83: bolt No. 2. Note: the large aluminum sleeve 8 and the small aluminum sleeve 11 have the same structural form, but the diameters of the aluminum sleeves are different.
Detailed Description
As shown in fig. 1 to 5, the invention is a spherical liquid vibration damper and an installation method for a fan blade, the spherical liquid vibration damper for a fan blade comprises a spherical mass block, a clip-shaped fixing plate 9, a shape memory alloy spring 10, a combination member and a fiber rope, wherein the spherical mass block is provided with 3 spherical masses, the diameters of which are sequentially increased from top to bottom, namely a No. 1 spherical mass 3, a No. 2 spherical mass 4 and a No. 3 spherical mass 5, each spherical mass block is composed of a hollow spherical shell 41, an all-carbon aerogel 44 and a high-density liquid 42, wherein the all-carbon aerogel 44 is wrapped by an elastic waterproof material 43 and then installed in the hollow of the hollow spherical shell 41, occupies 1/2 of the hollow volume, and the remaining 1/2 hollow volume is filled with the high-density liquid 42; the clip-shaped fixing plates 9 are provided with 3 blocks which correspond to the 3 spherical mass blocks one by one and are adhered to the inner surfaces of the blades 12, and four surfaces of each clip-shaped fixing plate 9 are connected with the corresponding spherical mass blocks through the shape memory alloy springs 10; the fiber ropes are synthesized by ultra-high molecular weight polyethylene fiber ropes and are divided into 4 synthesized by four strands and 3 synthesized by eight strands, wherein the 3 eight strands of ultra-high molecular weight polyethylene fiber ropes 2 are connected with the 3 spherical mass blocks in series at intervals through small aluminum sleeves 11, and the 4 four strands of ultra-high molecular weight polyethylene fiber ropes 6 are connected with the same position at the bottom of a No. 3 spherical mass block 5 with the largest diameter through a large aluminum sleeve 8; the assembly is divided into an A-type assembly 1 and a B-type assembly 7, wherein the A-type assembly 1 consists of a fixed base plate 14, a fixed support 15, a rotating support 16 and a connecting block 17, the fixed support 15 is welded on the fixed base plate 14, the rotating support 16 is connected in a longitudinal rotating groove of the fixed support 15 through a No. 1 bolt 13 and can rotate back and forth along the direction of the longitudinal rotating groove, and the connecting block 17 is connected in a transverse rotating groove of the rotating support 16 through the No. 1 bolt 13 and can rotate back and forth along the direction of the transverse rotating groove; wherein B class composite member 7 is equipped with 4, every all has by wedge PMKD 71, semi-cylinder fixing support 72, universal ball 73, screw 74 and screw rod 70 are constituteed, universal ball 73 card is in semi-cylinder fixing support 72, can rotate along arbitrary direction in semi-cylinder fixing support 72, and semi-cylinder fixing support 72 welds at wedge PMKD 71, through A class composite member 1 with eight strand ropes 2 of ultra high molecular weight polyethylene fibre and 12 apex inboards of fan blade are connected, through B class composite member 7 with four strand ropes 6 of ultra high molecular weight polyethylene fibre and 12 root inboards of fan blade are connected.
As shown in fig. 2, the high density liquid 42 is selected according to the desired damping ratio, and is saline, or water, or mercury.
The all-carbon aerogel 44 is made into a semicircle, has the same diameter as the inner diameter of the hollow spherical shell 41, and can rotate around the center of the circle in the hollow spherical shell 41. The all-carbon aerogel 44 is rapidly restored to the original shape after being compressed to 20% of the original volume for thousands of times, has super-strong elasticity, and can be adjusted in shape at will.
The spherical mass blocks are 3 in different diameters, the sizes of the diameters are determined according to the required damping ratio, and the spherical mass blocks are sequentially connected in series from small to large and from top to bottom according to the sizes of the diameters.
As shown in fig. 1, 2 and 3, the hollow spherical shell 41 is made of iron or steel, and the group a assembly 1, the group B assembly 7 and the clip-shaped fixing plate 9 are all made of light high-strength aluminum alloy.
As shown in fig. 1, 3 and 5, the large aluminum sleeve 8 and the small aluminum sleeve 11 are both composed of two semi-cylindrical shells, the distance between the two is adjusted by the aluminum ferrule 80 positioned in the clamping groove, the fiber rope arranged in the aluminum sleeve hole 81 is extruded, and the static friction force between the inner wall of the aluminum sleeve 82 and the fiber rope is increased, so that the fiber rope is anchored.
The invention discloses an installation method of a spherical liquid vibration damper suitable for fan blades, which comprises the following steps:
step (1): installing small aluminum sleeves 11 at the required ends of the 3 ultrahigh molecular weight polyethylene fiber eight-strand ropes 2, and welding the small aluminum sleeves at corresponding positions of the manufactured 3 spherical mass blocks;
step (2): adhering a fixed bottom plate 14 of the A-type assembly 1 to the blade tip part of the blade 12 by using an epoxy adhesive, and welding one end of the ultrahigh molecular weight polyethylene fiber eight-strand rope 2 connected in the step (1) to the upper surface of a connecting block 17 in the A-type assembly 1 through a small aluminum sleeve 11;
and (3): one ends of 4 ultrahigh molecular weight polyethylene fiber four-strand ropes 6 are respectively connected with 4 small aluminum sleeves 11, the other ends of the four-strand ropes are fixed together through 1 large aluminum sleeve 8, and the large aluminum sleeve 8 is welded at the bottom of a No. 3 spherical mass block 5 which is connected in series in the step (1) and has the largest diameter;
and (4): 4B-type combined members 7 are uniformly adhered by epoxy adhesive along the periphery of the inner surface of the root part of the blade 12;
and (5): simultaneously applying prestress on the 4 ultrahigh molecular weight polyethylene fiber four-strand ropes 6 connected in the step (3), respectively welding the four-strand ropes on the screw rods 70 of the 4B-type assemblies 7 through the small aluminum sleeves 11, and anchoring the screw rods 70 in corresponding screw holes of the corresponding B-type assemblies 7;
and (6): and adhering the clip-shaped fixing plates 9 corresponding to the spherical mass blocks one by one to the corresponding inner surfaces of the blades 12 by using epoxy adhesives, and welding the four surfaces of each spherical mass block and the four surfaces of the clip-shaped fixing plates 9 corresponding to the spherical mass blocks one by one through the shape memory alloy springs 10 to complete the installation of the whole spherical liquid vibration damper.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The spherical liquid vibration damper suitable for the fan blade comprises spherical mass blocks, a clip-shaped fixing plate (9), a shape memory alloy spring (10), a combination piece and a fiber rope, and is characterized in that the spherical mass blocks are provided with 3 spherical mass blocks (3, 2, 3) with diameters sequentially increased from top to bottom, wherein each spherical mass block consists of a hollow spherical shell (41), an all-carbon aerogel (44) and high-density liquid (42), the all-carbon aerogel (44) is wrapped by an elastic waterproof material (43) and then is arranged in the hollow of the hollow spherical shell (41) to occupy 1/2 of the hollow volume, and the residual 1/2 hollow volume is filled with the high-density liquid (42); the clip-shaped fixing plates (9) are provided with 3 blocks which correspond to the 3 spherical mass blocks one by one and are adhered to the inner surfaces of the blades (12), and four surfaces of each clip-shaped fixing plate (9) are connected with the corresponding spherical mass blocks through the shape memory alloy springs (10); the fiber ropes are synthesized by ultra-high molecular weight polyethylene fiber ropes and are divided into 4 synthesized four strands and 3 synthesized eight strands, wherein the 3 ultra-high molecular weight polyethylene fiber eight-strand ropes (2) are connected with the 3 spherical mass blocks in series at intervals through small aluminum sleeves (11), and the 4 ultra-high molecular weight polyethylene fiber four-strand ropes (6) are connected with the same position of the bottom of a No. 3 spherical mass block (5) with the largest diameter through a large aluminum sleeve (8); the combined part is divided into an A-type combined part (1) and a B-type combined part (7), wherein the A-type combined part (1) consists of a fixed base plate (14), a fixed support (15), a rotating support (16) and a connecting block (17), the fixed support (15) is welded on the fixed base plate (14), the rotating support (16) is connected in a longitudinal rotating groove of the fixed support (15) through a No. 1 bolt (13) and can rotate back and forth along the direction of the longitudinal rotating groove, and the connecting block (17) is connected in a transverse rotating groove of the rotating support (16) through the No. 1 bolt (13) and can rotate back and forth along the direction of the transverse rotating groove; wherein B class composite member (7) are equipped with 4, every all has by wedge PMKD (71), halfcylinder fixing support (72), universal ball (73), screw (74) and screw rod (70) are constituteed, universal ball (73) card is in halfcylinder fixing support (72), can rotate along arbitrary direction in halfcylinder fixing support (72), and halfcylinder fixing support (72) welding is in wedge PMKD (71), through A class composite member (1) with eight strand ropes of ultra high molecular weight polyethylene (2) and fan blade (12) apex inboard be connected, through B class composite member (7) with four strand ropes of ultra high molecular weight polyethylene (6) and fan blade (12) root inboard be connected.
2. A ball-type liquid damper for fan blades as claimed in claim 1, wherein: the high-density liquid (42) is selected according to the required damping ratio and adopts saline water, water or mercury.
3. A ball-type liquid damper for fan blades as claimed in claim 1, wherein: the all-carbon aerogel (44) is made into a semicircle, the diameter of the all-carbon aerogel is the same as the inner diameter of the hollow spherical shell (41), and the all-carbon aerogel can rotate around the center of a circle in the hollow spherical shell (41).
4. A ball-type liquid damper for fan blades as claimed in claim 1, wherein: the spherical mass blocks are 3 in different diameters, the sizes of the diameters are determined according to the required damping ratio, and the spherical mass blocks are sequentially connected in series from small to large and from top to bottom according to the sizes of the diameters.
5. A ball-type liquid damper for fan blades as claimed in claim 1, wherein: the hollow spherical shell (41) is made of iron or steel, and the A-type assembly (1), the B-type assembly (7) and the clip-shaped fixing plate (9) are all made of light high-strength aluminum alloy.
6. A ball-type liquid damper for fan blades as claimed in claim 1, wherein: big aluminium cover (8) and little aluminium cover (11) constitute by two semicylindrical shells, adjust the distance between the two through aluminium ferrule (80) that are located the draw-in groove, thereby the built-in fibre rope of extrusion aluminium trepanning (81), thereby the static friction power anchor fibre rope of increase aluminium sleeve (82) inner wall and fibre rope.
7. The installation method of the spherical liquid vibration damper suitable for the fan blade is characterized by comprising the following steps:
step (1): installing small aluminum sleeves (11) at the required ends of the 3 ultrahigh molecular weight polyethylene fiber eight-strand ropes (2), and welding the small aluminum sleeves at corresponding positions of the 3 manufactured spherical mass blocks;
step (2): adhering a fixed bottom plate (14) of the A-type assembly (1) to the blade tip part of the blade (12) by using an epoxy adhesive, and welding one end of the ultrahigh molecular weight polyethylene fiber eight-strand rope (2) connected in the step (1) on the upper surface of a connecting block (17) in the A-type assembly (1) through a small aluminum sleeve (11);
and (3): one ends of 4 ultrahigh molecular weight polyethylene fiber four-strand ropes (6) are respectively connected with 4 small aluminum sleeves (11), the other ends of the four-strand ropes are fixed together through 1 large aluminum sleeve (8), and the large aluminum sleeve (8) is welded at the bottom of a No. 3 spherical mass block (5) which is connected in series in the step (1) and has the largest diameter;
and (4): 4B-type assemblies (7) are uniformly adhered along the periphery of the inner surface of the root part of the blade (12) by using epoxy adhesive;
and (5): simultaneously applying prestress to the 4 ultrahigh molecular weight polyethylene fiber four-strand ropes (6) connected in the step (3), respectively welding the four-strand ropes to screw rods (70) of 4B-type assemblies (7) through small aluminum sleeves (11), and anchoring the screw rods (70) in corresponding screw holes of the corresponding B-type assemblies (7);
and (6): and adhering the clip-shaped fixing plates (9) which correspond to the spherical mass blocks one by one to the corresponding inner surfaces of the blades (12) by using epoxy adhesives, and welding the four surfaces of each spherical mass block and the four surfaces of the clip-shaped fixing plates (9) which correspond to the spherical mass blocks one by one through the shape memory alloy springs (10) to complete the installation of the whole spherical liquid vibration damper.
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| CN112648137B (en) * | 2021-01-19 | 2021-12-24 | 兰州理工大学 | Wind power blade multi-particle series speed amplification type vibration reduction device and connection method |
| CN117365874A (en) * | 2022-06-30 | 2024-01-09 | 金风科技股份有限公司 | Gyro assembly, fan blade, impeller and wind generating set |
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