CN-116804423-B - Acoustic black hole elastic coupling

CN116804423BCN 116804423 BCN116804423 BCN 116804423BCN-116804423-B

Abstract

The application belongs to the technical field of marine couplings, and particularly relates to an acoustic black hole elastic coupling which comprises a vibration reduction assembly and an intermediate shaft, wherein one end of the vibration reduction assembly is connected with the intermediate shaft, the other end of the vibration reduction assembly is externally connected with a transmission shaft, the vibration reduction assembly is provided with a plurality of groups of elastic element groups with different thicknesses, each elastic element group comprises a plurality of elastic elements and gaskets used for mounting adjacent elastic elements at intervals, the adjacent elastic elements and the gaskets positioned at the outer sides of the centers and the inner sides of the edges of the adjacent elastic elements can form a closed air cavity, damping structures are respectively laid on two end surfaces of the elastic elements, and insulators are respectively laid on contact surfaces of the elastic elements and the gaskets.

Inventors

Qian Xuqin
CHEN WENPIN
LUO QIANG
PAN KANGYI
MA YONGMING

Assignees

中国船舶集团有限公司第七〇四研究所

Dates

Publication Date: 20260512
Application Date: 20230616

Claims (9)

1. The acoustic black hole elastic coupler is characterized by comprising a vibration reduction assembly (1) and an intermediate shaft (2), wherein one end of the vibration reduction assembly (1) is connected with the intermediate shaft (2), and the other end is externally connected with a transmission shaft; The vibration reduction assembly (1) is provided with a plurality of groups of elastic element groups with different thicknesses, the elastic element groups are arranged in parallel, each elastic element group comprises a plurality of elastic elements and gaskets used for mounting adjacent elastic elements at intervals, each elastic element is of a disc structure with a central hole, each group of gaskets comprises an inner gasket and an outer gasket, each inner gasket is mounted on the outer edge of the central hole of one elastic element, and each outer gasket is mounted on the inner side of the outer edge of one elastic element; Each group of outer washers, inner washers and two elastic elements adjacent to the outer washers and the inner washers form a closed cavity; Damping structures are laid on two end faces of the elastic element; The two end surfaces of the elastic element are provided with a plurality of conical-like concave acoustic black holes which are alternately arrayed along different circumferential radial directions from the center outwards, the conical surface diameter of the acoustic black holes distributed along the radial direction from the inner diameter to the outer diameter on one end plane of the elastic element is gradually increased, and the conical surface diameter of the acoustic black holes distributed along the radial direction from the inner diameter to the outer diameter on the other end plane of the elastic element is gradually decreased; The damping structure comprises a viscous material and damping particles, wherein the viscous material is laid on a conical concave surface of the acoustic black hole, the structure of the damping particles is matched with that of the acoustic black hole, and the damping particles are fixed in the acoustic black hole through the viscous material; the vibration reduction assembly (1) comprises elastic element group assemblies (12), the two elastic element group assemblies (12) are arranged in parallel, the edges of the two elastic element group assemblies (12) are installed in series through fasteners, and insulators are laid on contact surfaces of the elastic elements and the washers and the fasteners.
2. Acoustic black hole elastic coupling according to claim 1, characterized in that the elastic element groups comprise at least two groups of different thickness, the respective thickness of the elastic elements, the washers and the cavities in each group of elastic elements being the same and progressively thicker towards the intermediate shaft (2).
3. Acoustic black hole elastic coupling according to claim 1, characterized in that the vibration damping assemblies (1) have two identical structures, the two vibration damping assemblies (1) being symmetrically mounted on the left and right sides of the intermediate shaft (2); The vibration reduction assembly (1) further comprises a first flange (13) and a second flange (14), the whole structure of the elastic element group assembly (12) is annular, the two elastic element group assemblies have the same structure, the first flange (13) and the second flange (14) are coaxially arranged outwards from the end part of the intermediate shaft (2) in sequence, One end of the first flange plate (13) is fixedly arranged at the end part of the intermediate shaft (2), the other end of the first flange plate is coaxially connected with one elastic element group assembly (12), one end of the second flange plate (14) is coaxially connected with the other elastic element group assembly (12), and the other end of the second flange plate is externally connected with a transmission shaft.
4. An acoustic black hole resilient coupling according to claim 3, wherein the resilient element group assembly (12) is a plurality of resilient element groups of different thickness.
5. The acoustic black hole resilient coupling of claim 1, wherein the damping particles are rubber material.
6. The acoustic black hole elastic coupling according to claim 1, wherein the number of the acoustic black holes distributed along the same circumferential direction on the elastic element is 6-10, and the number of the acoustic black holes distributed along different circumferential radial directions on the elastic element is 2-4.
7. An acoustic black hole resilient coupling according to claim 1, wherein the thickness of the gasket is 1/2 the thickness of the resilient element adjacent thereto; the elastic element is made of spring steel material, and the gasket is made of copper material.
8. The acoustic black hole elastic coupling according to claim 1, wherein the surface of the insulator is epoxy resin, and the inner material of the insulator is fiberglass geogrid.
9. An acoustic black hole resilient coupling according to claim 1, wherein the cross section of the acoustic black hole satisfies Wherein h (x) is the thickness of the acoustic black hole structure at x, For the truncated thickness of the acoustic black hole structure, A positive rational number with a power exponent m of more than or equal to 2 and 0.4-0.8 mm; Constant (constant) The calculation formula of (2) is Wherein h is the thickness of the elastic element, and r is the radius of the acoustic black hole; the calculation formula of the acoustic black hole radius r is as follows In the following Is the modulus of elasticity of the material, In order to achieve a density of the particles, For poisson's ratio, f is the characteristic frequency.

Description

Acoustic black hole elastic coupling Technical Field The invention belongs to the technical field of marine couplings, and particularly relates to an acoustic black hole elastic coupling. Background The coupling is used in the ship power transmission system, the power and the torque are transmitted, the angle compensation function is achieved, and the natural frequency of the transmission system is regulated, so that the torsional vibration characteristic of the transmission system is improved, the purposes of vibration reduction and noise reduction are achieved, and the elastic coupling has extremely high universality. The elastic element group is a key component of the elastic coupling, and in the working process of the elastic coupling, part of vibration waves are generally blocked from being transmitted to the intermediate shaft through the elastic element group, so that in a large ship motor drive transmission system, the performance of the elastic element group in the elastic coupling determines the performance of the coupling. In the existing diaphragm coupler, the diaphragm group has obvious amplitude at a low frequency band, the vibration reduction effect is poor, the electric insulation is rarely considered, the coupler is easy to damage, and the service life of the coupler is shortened, so that the diaphragm group design of the elastic coupler has important engineering application value. The patent with the publication number of CN217440622U grants a single diaphragm coupling with high strength and convenient installation, two diaphragm assemblies are arranged in a connecting sleeve, the connecting sleeve prevents the two diaphragm assemblies from contacting with the outside, the service life of the diaphragm assemblies is prolonged, and the disadvantage is that an obvious vibration reduction function cannot be achieved. The patent with the publication number of CN109027029B grants a low vibrating diaphragm coupling, a plurality of discs are assembled on the mandrel of the thin-wall sleeve at intervals, a damper is arranged between the discs and the inner wall of the thin-wall sleeve, the other end of the end part of the thin-wall sleeve is provided with a metal diaphragm in a circumferential sleeve mode, the outer side of the metal diaphragm is connected with a corresponding half coupling through a laminated plate, the supercritical vibration amplitude of the thin-wall sleeve in the diaphragm coupling is reduced, the stability of the coupling is improved, and the disadvantage is that the coupling is mainly optimized for the middle thin-wall sleeve structure, the structural optimization of a metal diaphragm assembly is not involved, and the coupling is suitable for high-speed high-power working conditions. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a novel acoustic black hole elastic coupler, which is designed to meet the power transmission and achieve the purpose of composite vibration reduction, has wide application prospect, is provided with an acoustic black hole and a damping structure on an elastic element, and increases the resonance bandwidth, consumes a large amount of vibration energy and reduces the effective transmission of vibration by utilizing the energy aggregation effect of the acoustic black hole, the damping vibration reduction technology, the influence of gas damping and rigidity in an air cavity between the elastic elements and the change of the thickness of the elastic element and the air cavity. In order to achieve the purpose, the invention provides an acoustic black hole elastic coupling which comprises a vibration reduction assembly and an intermediate shaft, wherein one end of the vibration reduction assembly is connected with the intermediate shaft, and the other end of the vibration reduction assembly is externally connected with a transmission shaft; The vibration reduction assembly is provided with a plurality of groups of elastic element groups with different thicknesses, the elastic element groups are arranged in parallel, each elastic element group comprises a plurality of elastic elements and gaskets used for mounting adjacent elastic elements at intervals, each elastic element is of a disc structure with a central hole, each group of gaskets comprises an inner gasket and an outer gasket, each inner gasket is mounted on the outer edge of the central hole of one elastic element, and each outer gasket is mounted on the inner side of the outer edge of one elastic element; Each group of outer washers, inner washers and two elastic elements adjacent to the outer washers and the inner washers form a closed cavity; damping structures are laid on two end faces of the elastic element. Further, the elastic element group at least comprises two groups with different thicknesses, and the thickness of each elastic element, the thickness of the gasket and the thickness of the cavity in each elastic element group are the same, and the