CN219570723U

CN219570723U - Vibration-damping noise-reducing Helmholtz resonator array plate

Info

Publication number: CN219570723U
Application number: CN202223554144.0U
Authority: CN
Inventors: 姚徐欣; 韩雷; 徐亚烽; 吴怡; 江奕
Original assignee: Nanjing Vocational University of Industry Technology NUIT
Current assignee: Nanjing Vocational University of Industry Technology NUIT
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-08-22
Anticipated expiration: 2032-12-29

Abstract

The utility model discloses a vibration-damping and noise-reducing Helmholtz resonator array plate, which relates to the field of vibration-damping and noise-reducing structures and comprises a perforated front panel, a resonant cavity, a piston rod, a vibration-damping spring unit and a fixed bottom plate, wherein a penetrating hole is formed in the surface of the perforated front panel, the resonant cavity corresponding to the penetrating hole is formed in the bottom of the perforated front panel, the fixed bottom plate is fixedly connected to the lower side of the perforated front panel through the vibration-damping spring unit, and the piston rod which is in sliding connection with the resonant cavity is arranged on the fixed bottom plate. The utility model constructs the vibration-damping noise-reducing Helmholtz resonator array plate by combining the Helmholtz resonator with the vibration-damping spring unit, thereby not only realizing the sound absorption effect in a wide frequency range, but also playing a good role in buffering vibration. The utility model has simple structure and has certain application prospect for controlling vibration and noise of various power devices.

Description

Vibration-damping noise-reducing Helmholtz resonator array plate

Technical Field

The utility model relates to the field of vibration and noise reduction structures, in particular to a vibration and noise reduction Helmholtz resonator array plate.

Background

With the development of modern industry and transportation industry, the noise pollution problem is more and more serious, and the noise pollution problem becomes one of the modern important public hazards, and seriously threatens the physical and psychological health and living environment of human beings. In the industrial field, the improvement of the mechanical degree makes the vibration and noise problems of the equipment increasingly prominent, directly leads to the great discount of the service life of the equipment and even generates production accidents; in daily life of people, electric appliances such as washing machines, air conditioners, refrigerators and the like become an inseparable part of every family, and vibration and noise problems of electric appliances become important factors affecting the quality of life of people and are also important assessment indexes of the quality of products.

The current vibration and noise reduction method for the structure generally lays a flexible sound absorption material in addition, but the flexible sound absorption material only can absorb sound and cannot fundamentally solve the noise problem caused by vibration, and the support force is insufficient and the vibration reduction effect on the existing equipment is not great.

Disclosure of Invention

The utility model aims to provide a vibration-damping and noise-reducing Helmholtz resonator array plate, which aims to solve the problems that the current vibration-damping and noise-reducing method for a structure generally lays a flexible sound-absorbing material in addition, but the flexible sound-absorbing material only can absorb sound and cannot fundamentally solve the noise problem caused by vibration, the supporting force is insufficient, and the vibration-damping effect on the existing equipment is not great.

The utility model provides a Helmholtz resonator array board of making an uproar falls in damping, includes perforation front panel, resonant cavity, piston rod, damping spring unit and PMKD, the surface of perforation front panel is opened has the access hole just the resonant cavity that corresponds with the access hole is seted up to the bottom of perforation front panel, the below of perforation front panel passes through damping spring unit fixedly connected with PMKD, PMKD is last be equipped with resonant cavity sliding connection's piston rod.

Preferably, the upper surface of the perforated front panel is provided with a plurality of penetrating holes and the penetrating holes are in an array structure, the lower surface of the perforated front panel is provided with a plurality of resonant cavities which are in one-to-one correspondence and are communicated with the penetrating holes, and the inside of each resonant cavity is slidably connected with the piston rod, and the bottom of the piston rod is fixedly connected with the fixed bottom plate.

Preferably, the piston rod is of a T-shaped structure, the horizontal part of the piston rod is positioned in the resonant cavity, and the height of the piston rod on the fixed bottom plate is sequentially increased from left to right.

Preferably, the perforated front panel is provided with 9 rows and 9 columns of penetration holes at equal intervals, the diameter and the depth of the penetration holes are 10mm, the resonant cavity is cylindrical, the diameter of the resonant cavity is 50mm, the resonant cavity is also provided with 9 rows and 9 columns, and the depth of the resonant cavity is 99,90,81,72,65,59,54,50 and 47mm from left to right.

Preferably, a porous sound absorbing material is filled between the lower part of the perforated front panel and the fixed bottom plate, and the utility model has the following advantages:

when noise sound waves enter the resonant cavity through the penetrating holes, noise sound energy is concentrated in the cavity to be dissipated due to resonance effect, and the noise radiation is attenuated, so that noise propagation is reduced. Meanwhile, when vibration is generated at the installation position, impact caused by the vibration can be transmitted to the vibration damping spring unit through the sound absorption part of the device, so that the vibration is buffered, synchronous control of the vibration and noise is realized, and the vibration damping and noise resisting effects are enhanced. The utility model constructs the vibration-damping noise-reducing Helmholtz resonator array plate by combining the Helmholtz resonator with the vibration-damping spring unit, thereby not only realizing the sound absorption effect in a wide frequency range, but also playing a good role in buffering vibration. The utility model has simple structure and has certain application prospect for controlling vibration and noise of various power devices.

Drawings

FIG. 1 is a schematic three-dimensional structure of an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of an embodiment;

fig. 3 is a graph of the sound absorption coefficient of a vibration damping and noise reduction Helmholtz resonator array plate as a function of the frequency of an incident sound wave.

Reference numerals in the drawings: 1. perforating the front panel; 2. penetrating the hole; 3. a resonant cavity; 4. a piston rod; 5. a fixed bottom plate; 6. porous sound absorbing material; 7. and a damper spring unit.

Detailed Description

The following detailed description of the embodiments of the utility model, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the utility model by those skilled in the art.

As shown in fig. 1-3, the utility model provides a vibration-damping and noise-reducing Helmholtz resonator array plate, which comprises a perforated front panel 1, a resonant cavity 3, a piston rod 4, a vibration-damping spring unit 7 and a fixed bottom plate 5, wherein the surface of the perforated front panel 1 is provided with a penetrating hole 2, the bottom of the perforated front panel 1 is provided with the resonant cavity 3 corresponding to the penetrating hole 2, the fixed bottom plate 5 is fixedly connected below the perforated front panel 1 through the vibration-damping spring unit 7, and the fixed bottom plate 5 is provided with the piston rod 4 which is in sliding connection with the resonant cavity 3.

The upper surface of perforation front panel 1 is equipped with a plurality of the access hole 2 just access hole 2 is array structure, the lower surface of perforation front panel 1 is opened a plurality of resonant cavity 3 just resonant cavity 3 with access hole 2 one-to-one just communicates, the inside sliding connection in resonant cavity 3 has piston rod 4 just the bottom of piston rod 4 with PMKD 5 fixed connection. The piston rod 4 is of a T-shaped structure, the horizontal part of the piston rod 4 is positioned in the resonant cavity, and the height of the piston rod 4 on the fixed bottom plate 5 is sequentially increased from left to right.

When noise sound waves enter the resonant cavity 3 through the penetrating holes 2, noise sound energy is concentrated in the resonant cavity 3 to be dissipated due to the resonance effect, the attenuation effect is achieved on noise radiation, so that noise propagation is reduced, in addition, the piston rod 4 is arranged at different heights, noise of different frequencies can be absorbed, and the noise reduction effect is enhanced. In addition, when the installation position vibrates, the fixed bottom plate is installed back to the vibration noise device, the perforated front panel 1 moves downwards under vibration, the piston rod 4 is contracted inwards of the resonant cavity 3, the vibration reduction spring unit 7 deforms to absorb energy, and the vibration reduction effect of the whole device is enhanced.

The surface of the perforated front panel 1 is provided with 9 rows and 9 columns of penetration holes 2 at equal intervals, the diameter and depth of the penetration holes 2 are 10mm, the resonant cavity 3 is cylindrical, the diameter of the resonant cavity is 50mm, the resonant cavity 3 is also provided with 9 rows and 9 columns, and the depth of the resonant cavity 3 is 99,90,81,72,65,59,54,50 and 47mm from left to right in sequence.

A porous sound absorbing material 6 is further arranged between the lower part of the perforated front panel 1 and the fixed bottom plate 5, the porous sound absorbing material can be damping sponge or other porous flexible materials, the porous sound absorbing material 6 enhances the damping performance of the whole perforated front panel 1 on one hand, and a loose porous structure can absorb certain noise.

Working principle: when the perforated front panel 1 is installed facing the vibration noise device in use, the fixing bottom plate 5 is installed facing away from the vibration noise device, so that the fixing and supporting functions of the integral vibration damping and noise reduction device are achieved, when noise sound waves enter the resonant cavity 3 through the penetrating holes 2, noise sound energy is concentrated in the resonant cavity 3 to be dissipated due to the resonance effect, the attenuation effect is achieved on noise radiation, accordingly noise propagation is reduced, in addition, the piston rod 4 is arranged to be different in height, noise of different frequencies can be absorbed, and the noise reduction effect is enhanced. In addition, when the installation position vibrates, the fixed bottom plate is installed back to the vibration noise device, the perforated front panel 1 moves downwards under vibration, the piston rod 4 is contracted inwards of the resonant cavity 3, the vibration reduction spring unit 7 deforms to absorb energy, and the vibration reduction effect of the whole device is enhanced.

While the utility model has been described above with reference to the accompanying drawings, it will be apparent that the utility model is not limited to the above embodiments, but is capable of being modified or applied to other applications without modification, as long as various insubstantial modifications of the inventive concept and technical solutions are adopted, all within the scope of the utility model.

Claims

1. A vibration damping noise reducing Helmholtz resonator array plate, characterized in that: including perforation front panel (1), resonant cavity (3), piston rod (4), damping spring unit (7) and PMKD (5), the surface of perforation front panel (1) is opened has puncture hole (2) just resonant cavity (3) that correspond with puncture hole (2) are seted up to the bottom of perforation front panel (1), the below of perforation front panel (1) is through damping spring unit (7) fixedly connected with PMKD (5), PMKD (5) go up be equipped with PMKD (4) of resonant cavity (3) sliding connection.

2. A vibration-damping noise-reducing Helmholtz resonator array plate according to claim 1, characterized in that: the upper surface of perforation front panel (1) is equipped with a plurality of puncture hole (2) just puncture hole (2) are array structure, the lower surface of perforation front panel (1) is opened and is had a plurality of resonant cavity just resonant cavity with puncture hole (2) one-to-one just communicates, the inside sliding connection of resonant cavity (3) has piston rod (4) just the bottom of piston rod (4) with fixed baseplate (5) fixed connection.

3. A vibration-damping noise-reducing Helmholtz resonator array plate according to claim 2, characterized in that: the piston rod (4) is of a T-shaped structure, the horizontal part of the piston rod (4) is positioned in the resonant cavity, and the height of the piston rod (4) on the fixed bottom plate (5) is sequentially increased from left to right.

4. A vibration-damping noise-reducing Helmholtz resonator array plate according to claim 3, characterized in that: the surface equidistant 9 rows and 9 columns of penetration holes (2) are formed in the surface of the perforated front panel (1), the diameter and depth of the penetration holes (2) are 10mm, the diameter of the resonant cavity (3) is 50mm, the resonant cavity (3) is also provided with 9 rows and 9 columns, and the depth of the resonant cavity (3) is 99,90,81,72,65,59,54,50 mm and 47mm from left to right.

5. A vibration-damping noise-reducing Helmholtz resonator array plate according to claim 2, characterized in that: a porous sound absorbing material (6) is arranged between the lower part of the perforated front panel (1) and the fixed bottom plate (5).