CN215220255U - Muffler device - Google Patents

Abstract

The application relates to a noise eliminator is applicable to electric power system technical field, and this noise eliminator sets up in the vent of transformer substation owner room, noise eliminator includes: the damping device comprises a resistive damping element and a resistive damping element, wherein the resistive damping element and the resistive damping element are arranged side by side, the resistive damping element is close to a chamber of a main transformer chamber of the transformer substation, and the resistive damping element is far away from the chamber of the main transformer chamber of the transformer substation; the reactive silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity is arranged between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups. The noise eliminator can reduce noise generated by the transformer and reduce noise influence on residents.

Description

Muffler device

Technical Field

The application relates to the technical field of electric power systems, in particular to a noise elimination device.

Background

With the rapid development of the economy of China, the development of the power system is more and more perfect. The use of transformers has increased, making transformers an essential part of power systems. In normal operation of the transformer, a large amount of noise is generated, so that sound pollution is caused, and normal life of residents is influenced.

In the conventional technology, a civil wall part of a main transformer chamber for placing a transformer is improved to meet the design requirements of sound insulation and noise reduction.

However, the noise generated by the transformer is still transmitted through the ventilation opening of the main transformer chamber, which affects the life of residents.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a muffler device that can reduce noise generated by a transformer and reduce noise influence on residents.

The utility model provides a noise eliminator, its characterized in that sets up in the vent of transformer substation owner room, and noise eliminator includes: the damping device comprises a resistive damping element and a resistant damping element, wherein the resistive damping element and the resistant damping element are arranged side by side, the resistant damping element is close to the inside of a main transformer chamber of the transformer substation, and the resistive damping element is far away from the inside of the main transformer chamber of the transformer substation; the resistance silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity exists between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups.

In one embodiment, the perforated plate and the metal blind plate in the resistant silencing element are arranged parallel to the axis of the ventilation opening.

In one embodiment, each group of perforated plates comprises the same number of perforated plates.

In one embodiment, each perforated plate set comprises a first perforated plate and a second perforated plate, wherein the first perforated plate and the second perforated plate have different perforation rates.

In one embodiment, the first perforated plate has a perforation rate of 0.2% and the second perforated plate has a perforation rate of 0.1%.

In one embodiment, the resonant cavity comprises a first resonant cavity and a second resonant cavity, wherein the cavity depth of the first resonant cavity is 100mm, and the cavity depth of the second resonant cavity is 50 mm.

In one embodiment, the thickness of each perforated plate is 0.6 mm-2.0 mm, and the aperture of the perforations in each perforated plate is 0.6 mm-2.0 mm

In one embodiment, the resistive muffler element comprises a plurality of metal perforated facing sheets, a gap is formed between any two adjacent metal perforated facing sheets, and porous sound absorbing material is filled in the gap.

In one embodiment, the thickness of each metal perforated protective panel is 0.6 mm-2.0 mm, the perforation rate of each metal perforated protective panel is 20% -35%, and the aperture of the perforation in each metal perforated protective panel is 3 mm-5 mm.

In one embodiment, the outer surface of the porous sound absorption material is coated with a facing cloth for preventing the fibers from leaking.

Above-mentioned noise eliminator sets up in the vent of transformer substation owner room, and this noise eliminator includes: the damping device comprises a resistive damping element and a resistant damping element, wherein the resistive damping element and the resistant damping element are arranged side by side, the resistant damping element is close to the inside of a main transformer chamber of the transformer substation, and the resistive damping element is far away from the inside of the main transformer chamber of the transformer substation; the resistance silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity exists between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups. The resistance silencing element in the silencing device can reduce high-frequency noise in a main transformer chamber of the transformer chamber, and the resistance silencing element can reduce low-frequency noise in the main transformer chamber of the transformer chamber. The resistance noise elimination element and the resistance noise elimination element are arranged side by side, so that medium-high frequency noise can be reduced, and medium-low frequency noise can also be reduced. In addition, because the transformer substation in the main transformer chamber generates the low-medium frequency noise, the low-medium frequency noise in the main transformer chamber is larger, and the resistance noise elimination element is close to the interior of the main transformer chamber of the transformer substation, so that the low-medium frequency noise generated by the transformer substation in the main transformer chamber can be effectively reduced, and the low-medium frequency noise is prevented from being transmitted from the ventilation opening to influence the life of residents. The resistance silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity exists between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups. The reactive silencing element forms a resonant cavity based on the plurality of perforated plates and the metal blind plate in each perforated plate group, so that low-medium-frequency noise can be attenuated in the resonant cavity, and the low-medium-frequency noise can be reduced.

Drawings

FIG. 1 is a schematic view of a muffler assembly according to one embodiment;

FIG. 2 is a schematic diagram of a perforated plate structure in one embodiment;

FIG. 3 is a schematic representation of the sound absorption coefficient of the resistive element of the muffling apparatus of another embodiment;

FIG. 4 is a schematic view of the muffler assembly according to one embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The embodiment of the application provides a silencing device 10, wherein the silencing device 10 is arranged in a ventilation opening of a main transformer chamber of a transformer substation, and the structure of the silencing device is shown in fig. 1. The muffler device 10 includes a resistive muffler element 11 and a reactive muffler element 12, and the resistive muffler element 11 and the reactive muffler element 12 are arranged side by side. The resistance noise elimination element 12 is close to the interior of a main transformer chamber of the transformer substation, and the resistance noise elimination element 11 is far away from the interior of the main transformer chamber of the transformer substation.

The reactive silencing element 12 includes two perforated plate sets 121 and a metal blind plate 122, which are arranged side by side, each perforated plate set 121 includes a plurality of perforated plates arranged side by side, a resonant cavity 123 exists between any two adjacent perforated plates, and the metal blind plate 122 is arranged between the two perforated plate sets 121.

In the embodiment of the present application, the interior of the resistive muffler element 11 may be filled with a sound absorbing material to achieve the purpose of sound attenuation. The resistive silencing element 11 has a good silencing effect on medium and high frequency noise, especially on noise with frequency higher than 300 Hz. The reactive silencing element 12 can change the impedance of the noise in the transmission process to generate reflection and interference of sound energy, so that the sound energy radiated outwards by the reactive silencing element is reduced, and the aim of silencing is fulfilled. The low-frequency noise silencing effect of the reactive silencing element 12 is good. Furthermore, the resistive silencing element 11 and the resistive silencing element 12 are arranged side by side. The resistance noise elimination element 12 is close to the interior of a main transformer chamber of the transformer substation, and the resistance noise elimination element 11 is far away from the interior of the main transformer chamber of the transformer substation. Because the transformer substation in the main transformer chamber generates the low-medium frequency noise, the low-medium frequency noise in the main transformer chamber is larger, and the reactive noise elimination element is close to the interior of the main transformer chamber of the transformer substation, so that the low-medium frequency noise generated by the transformer substation in the main transformer chamber can be effectively reduced, and the low-medium frequency noise is prevented from being transmitted from the ventilation opening to influence the life of residents. In the embodiment of the present application, the reactive silencing element 12 comprises two perforated plate groups 121 arranged side by side, each perforated plate group 121 comprising a plurality of perforated plates arranged side by side, and a resonant cavity 123 exists between any two adjacent perforated plates, and a metal blind plate 122 is arranged between two perforated plate groups 121.

In the present embodiment, the noise can enter the resonance cavity 123 through a plurality of perforated plates arranged side by side in the reactive silencing element 12. Because the metal blind plate 122 is arranged between the two perforated plate groups 121, the two groups of perforated plate groups are separated by the metal blind plate 122, a part of noise passing through the perforated plates in the perforated plate groups 121 on both sides is attenuated, and the other part of noise entering the resonant cavity meets the metal blind plate 122 in the resonant cavity, and the noise can only vibrate in the resonant cavity because the noise cannot pass through the metal blind plate 122, so that the noise is attenuated, and the effect of reducing the noise is achieved.

In this embodiment, the above-mentioned noise eliminator is arranged in a ventilation opening of a main transformer chamber of a transformer substation, and the noise eliminator includes: the damping device comprises a resistive damping element and a resistant damping element, wherein the resistive damping element and the resistant damping element are arranged side by side, the resistant damping element is close to the inside of a main transformer chamber of the transformer substation, and the resistive damping element is far away from the inside of the main transformer chamber of the transformer substation; the resistance silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity exists between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups. The resistance silencing element in the silencing device can reduce high-frequency noise in a main transformer chamber of the transformer chamber, and the resistance silencing element can reduce low-frequency noise in the main transformer chamber of the transformer chamber. The resistive noise elimination element and the resistive noise elimination element are arranged side by side, so that medium-high frequency noise can be reduced, medium-low frequency noise can be reduced, the resistive noise elimination element is close to the interior of a main transformer chamber of the transformer substation, the medium-low frequency noise generated by the transformer substation can be reduced, and the medium-low frequency noise is prevented from being transmitted from a ventilation opening to influence the life of residents. The resistance silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity exists between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups. The reactive silencing element forms a resonant cavity based on the plurality of perforated plates and the metal blind plate in each perforated plate group, so that low-medium-frequency noise can be attenuated in the resonant cavity, and the low-medium-frequency noise can be reduced.

In an alternative implementation of the present application, each set of perforated plates comprises the same number of perforated plates.

Alternatively, each perforated plate group may include any number of perforated plates greater than 1. For example, the number of perforated plates included in each perforated plate group may be 2, 3, 4, or 5, and the number of perforated plates included in each perforated plate group is not specifically limited in the embodiments of the present application.

In the embodiment of the application, the perforated plates of each perforated plate group are the same in number, so that the noise can be guaranteed to simultaneously reach the metal blind plates from two sides of the resistant silencing element, and the noise can vibrate in the resonant cavity next to the metal blind plates, so that the noise is effectively attenuated.

The perforated plates have different thicknesses and different hole diameters of the perforations in the perforated plates, so that the frequencies of noise that can be reduced are different. In an alternative implementation of the present application, the thickness of each perforated plate in the resistant muffling element may be 0.6mm to 2.0mm, and the diameter of each perforated plate may be 0.6mm to 2.0 mm.

In the embodiment of the application, the frequency of the noise generated by the transformer substation is 100Hz and 200Hz, in order to reduce the noise with the frequency of 100Hz and 200Hz, the thickness of each perforated plate is 0.6 mm-2.0 mm, and the aperture of each perforated plate is 0.6 mm-2.0 mm. Illustratively, the thickness of each perforated plate may be 1.0mm, and the diameter of the perforations in each perforated plate may be 2.0 mm.

In the embodiment of the application, the thickness of each perforated plate in the resistant silencing element is 0.6-2.0 mm, and the aperture of each perforated plate is 0.6-2.0 mm. Thereby being more advantageous for reducing the noise with frequencies of 100Hz and 200 Hz.

In an alternative implementation of the present application, each set of perforated plates in the resistive muffling element comprises a first perforated plate and a second perforated plate, wherein the first perforated plate and the second perforated plate have different perforation rates.

In an embodiment of the application, each set of perforated plates in the resistive muffling element comprises a first perforated plate and a second perforated plate. In order to increase the noise reduction capacity, the perforation rates of the first perforated plate and the second perforated plate in the resistant silencing element are different. For example, if the perforation rates of the first perforated plate and the second perforated plate are the same, there may be a possibility that the perforations of the first perforated plate may align with the perforations of the second perforated plate, such that the first perforated plate and the second perforated plate function equivalently to the same perforated plate. Thus, the effect of reducing noise is reduced.

In the embodiment of the application, each perforated plate group in the resistant silencing element comprises a first perforated plate and a second perforated plate, and the perforation rates of the first perforated plate and the second perforated plate are different. So that the resistant silencing element can better reduce the noise.

In an alternative embodiment of the present application, the first perforated plate of the set of perforated plates in the resistive muffling element has a perforation rate of 0.2% and the second perforated plate has a perforation rate of 0.1%, as shown in fig. 2, where (a) in fig. 2 is the first perforated plate and (b) in fig. 2 is the second perforated plate.

In an alternative embodiment of the application, the frequencies of the noise generated by the substation are 100Hz and 200Hz, and in order to be able to reduce the noise with frequencies of 100Hz and 200Hz, the perforation rate of the first perforated plate in the set of perforated plates in the resistant damping element is 0.2%, and the perforation rate of the second perforated plate is 0.1%.

In an alternative implementation of the present application, the resonant cavity includes a first resonant cavity and a second resonant cavity, wherein the cavity depth of the first resonant cavity is 100mm, and the cavity depth of the second resonant cavity is 50 mm.

The cavity depth of the resonant cavity can determine the noise reduction effect, and the deeper the cavity depth of the resonant cavity, the longer the noise travels in the resonant cavity, so that the more serious the noise is attenuated in the resonant cavity, the better the noise reduction effect of the resonant cavity is. The shallower the cavity depth of the resonant cavity, the shorter the time the noise travels within the resonant cavity, so that the less the noise is attenuated within the resonant cavity, the less the noise can also travel outward through the perforated plate, and thus the less effective the resonant cavity is in reducing the noise. In the embodiment of the present application, the resonant cavity includes a first resonant cavity and a second resonant cavity, wherein the cavity depth of the first resonant cavity is 100mm, and the cavity depth of the second resonant cavity is 50 mm.

Optionally, in the two perforated plate groups in the embodiment of the present application, each perforated plate group includes two perforated plates, which are a first perforated plate and a second perforated plate respectively. The resonant cavity between the first perforated plate and the second perforated plate in the first perforated plate group is a first resonant cavity, and the depth of the cavity of the first resonant cavity is 100 mm. The resonant cavity between the second perforated plate and the metal blind plate is a second resonant cavity, and the depth of the cavity of the second resonant cavity is 50 mm.

In the present embodiment, when the perforations in the perforated plate have a hole depth and hole diameter much smaller than the wavelength of the acoustic wave, the air column in the perforations acts like a mass, while the volume of the resonant cavity is much larger than the perforations, which acts like an air spring. When the frequency of the external incident sound wave is equal to the natural frequency of the perforated plate, the air column in the perforations vibrates violently due to resonance and rubs against the walls of the holes to dissipate the sound energy.

In the embodiment of the present application, the resonant cavity includes a first resonant cavity and a second resonant cavity, wherein the cavity depth of the first resonant cavity is 100mm, and the cavity depth of the second resonant cavity is 50 mm. The natural frequency of the perforated plate can be made equal to the noise frequency, so that the noise generated by the substation at frequencies of 100Hz and 200Hz can be reduced.

The sound absorption properties of the resistant sound-damping element are generally expressed in terms of sound absorption coefficient. The sound waves incident on the surface of the resistant silencing element are partially reflected and partially transmitted through the perforations of the perforated plate of the resistant silencing element into the resistant silencing element. The sound waves entering the resistant damping element are attenuated in the resonant cavity of the resistant damping element by frictional conversion into heat energy with the metal blind plate and the walls of the perforated hole. In the embodiments of the present application, the ratio of the sound energy absorbed by the resistive muffling element to the incident sound energy is referred to as the sound absorption coefficient. For the total reflection surface, the sound absorption coefficient is 0; for a full absorption surface, the sound absorption coefficient is 1; the sound absorption coefficient of the general sound absorption material is between 0 and 1. In addition, the sound absorption coefficient of a material depends on the incident angle of the sound wave, and varies with the frequency of the incident sound wave. In the embodiment of the present application, when the incident angle of the sound wave to the reactive silencing element is 90 degrees, the normal incidence sound absorption coefficient of the reactive silencing element is as shown in fig. 3. Wherein the abscissa is the frequency of the noise and the ordinate is the sound absorption coefficient.

As can be seen from fig. 3, the sound absorption coefficient of the reactive silencing element in the embodiment of the present application is the highest for the noises with frequencies of 100Hz and 200 Hz. It can be seen that the reactive silencing element in the embodiment of the present application absorbs the most noise at the frequencies of 100Hz and 200Hz, and reflects the least noise at the frequencies of 100Hz and 200 Hz. The resistive silencing element is based on a resonant cavity and on a plurality of perforated plates, so as to attenuate the noise absorbed at frequencies of 100Hz and 200 Hz. However, the noise in the air at frequencies of 100Hz and 200Hz is also very small. Therefore, the reactive silencing element in the embodiment of the application can well reduce the noise with the frequencies of 100Hz and 200 Hz.

In an alternative realization of the present application, the perforated plate and the metal blind plate 122 of the resistant silencing element 12 are arranged parallel to the axis of the ventilation opening.

In the embodiment of the present application, each perforated plate and the metal blind plate 122 are disposed perpendicular to the ground and parallel to the axis of the vent. The contact surface of the perforated plate surface and noise is larger, the noise can enter from the perforated plates on two sides, and then the noise is attenuated based on the perforated plates and the resonant cavities among the perforated plates. Thereby achieving the effect of reducing noise.

In an alternative embodiment of the present application, as shown in fig. 4, the resistive muffler element 11 includes a plurality of perforated metal facing sheets 111, and a gap 112 is formed between any two adjacent perforated metal facing sheets 111, and is filled with a porous sound absorbing material 113.

In the present application, the resistive muffler element 11 and the reactive muffler element 12 are arranged side by side, and in order to ensure smooth airflow, the resistive muffler element 11 and the reactive muffler element 12 have the same thickness.

Illustratively, the sum of the total thicknesses of each perforated plate, the metal blind plate and the resonant cavity in the resistant muffling element is 300mm, and then the thickness of the resistant muffling element is 300mm, so that the thicknesses of the resistant muffling element and the resistant muffling element are the same, and the two outermost metal perforated protective plates of the resistant muffling element and the outermost perforated plate of the resistant muffling element can be flush with each other, so that the smoothness of the air flow can be ensured.

In the embodiment of the present application, the porous sound absorbing material 113 has a large number of interconnected pores that are open to the outside, i.e., the material has a certain air permeability. In this application embodiment, porous sound absorbing material can be materials such as glass fiber cotton, rock wool, and this application embodiment does not specifically limit porous sound absorbing material.

In the embodiments of the present application, the sound absorption mechanism of the porous sound absorption material is: when sound waves are incident on the porous sound absorbing material, vibration of air in the pores is caused. Due to friction and viscous drag of air, a portion of the sound energy is converted into heat energy. In addition, heat loss is also caused by heat conduction between the air in the pores and the walls and fibers of the pores, so that the acoustic energy is attenuated.

In the present embodiment, the resistive muffler element 11 includes a plurality of perforated metal facing sheets 111, and a gap 112 is formed between any two adjacent perforated metal facing sheets 111, and the gap is filled with a porous sound absorbing material 113. The resistance sound absorption element can absorb sound energy of noise through the plurality of metal perforated protective panels, and the sound energy absorbed into the resistance sound absorption element is converted into heat energy based on the porous sound absorption material filled in the gap, so that the sound energy is attenuated, and the noise is reduced.

In an optional implementation of the present application, the thickness of each metal perforated facing sheet is 0.6mm to 2.0mm, the perforation rate of each metal perforated facing sheet is 20% to 35%, and the diameter of the perforations in each metal perforated facing sheet is 3mm to 5 mm.

In the embodiment of the application, in order to make the sound absorption coefficient of the resistive silencing element for the middle and high frequency noise higher, more sound energy at the middle and high frequency can be absorbed. The thickness of the metal perforated protective panel can be 0.6 mm-2.0 mm. In an alternative embodiment of the present application, the thickness of the metal perforated facing plate may be 1.0mm, 1.5mm, and 2.0mm, and the thickness of the metal perforated facing plate is not specifically limited in the embodiment of the present application. The perforation rate of each metal perforated protective panel of the resistive noise elimination element is 20% -35%, in the embodiment of the application, the perforation rate of each metal perforated protective panel of the resistive noise elimination element can be 20%, 30% and 35%, and the application does not specifically limit the perforation rate of the metal perforated protective panel. The aperture of the middle perforation of each metal perforated protective panel of the resistive noise elimination element can be 3 mm-5 mm, optionally, the aperture of the middle perforation of each metal perforated protective panel of the resistive noise elimination element can be 3mm, 4mm and 5mm, and the aperture of the middle perforation of each metal perforated protective panel of the resistive noise elimination element is not specifically limited in the application.

In the embodiment of the application, the thickness of each metal perforated protective panel is 0.6-2.0 mm, the perforation rate of each metal perforated protective panel is 20-35%, and the aperture of the perforation in each metal perforated protective panel is 3-5 mm. The resistance silencing element is arranged based on the thickness, the perforation rate and the perforation aperture of the metal perforated protective panel, so that the suction coefficient of the resistance silencing element to middle and high frequency noise is larger, more sucked noise is generated, and the bottom crossing effect of the noise is better.

In an alternative embodiment of the present application, the outer surface of the porous sound absorbing material is covered with a facing cloth for preventing leakage of fibers.

In the embodiment of the present application, the facing cloth may be a glass fiber cloth or a non-woven cloth. Since the facing layer itself also has an acoustic effect, it also has a certain influence on the sound absorption properties of the porous sound absorbing material therein.

In this application embodiment, porous sound absorbing material surface cladding prevents the facing cloth that the fibre was revealed, can help the better noise absorption of porous sound absorbing material, reduces the noise.

In order to better understand the muffler device described in the embodiments of the present application, the embodiments of the present application provide an alternative muffler device.

The silencing device comprises a resistive silencing element and a resistant silencing element, wherein the resistive silencing element and the resistant silencing element are arranged in a ventilation opening of a main transformer chamber of a transformer substation side by side. The resistance noise elimination element is close to the interior of a main transformer chamber of the transformer substation, and the resistance noise elimination element is far away from the interior of the main transformer chamber of the transformer substation.

The resistance silencing element comprises two perforated plate groups and a metal blind plate which are arranged side by side, each perforated plate group comprises two perforated plates which are arranged side by side, and the two perforated plate groups are symmetrically separated by the metal blind plate. The perforated plate and the metal blind plate in the resistant silencing element are arranged perpendicular to the ground and parallel to the axis of the ventilation opening. Each perforated plate group comprises a first perforated plate and a second perforated plate, the perforation rate of the first perforated plate is 0.2%, and the perforation rate of the second perforated plate is 0.1%. The thickness of each perforated plate is 1.0mm, the aperture of each perforated plate is 2.0mm, and the thickness of the metal blind plate is 1.0 mm.

Wherein, on one side of the metal blind plate, the first perforated plate is an outer perforated plate, and the second perforated plate can be an inner perforated plate. The resonant cavity between the first perforated plate and the second perforated plate in the first perforated plate group is a first resonant cavity, and the depth of the cavity of the first resonant cavity is 100 mm. The resonant cavity between the second perforated plate and the metal blind plate is a second resonant cavity, and the depth of the cavity of the second resonant cavity is 50 mm.

On the other side of the metal blind plate, the first perforated plate is an outer perforated plate, and the second perforated plate can be an inner perforated plate. The resonant cavity between the first perforated plate and the second perforated plate in the first perforated plate group is a first resonant cavity, and the depth of the cavity of the first resonant cavity is 100 mm. The resonant cavity between the second perforated plate and the metal blind plate is a second resonant cavity, and the depth of the cavity of the second resonant cavity is 50 mm.

The thickness of the reactive muffler element is the sum of the thickness of the metal blind plate, the thickness of each perforated plate in each perforated plate set and the thickness of each resonant cavity, and the calculation result is 305 mm.

The resistive muffler element 11 comprises two perforated metal guard plates 111, and a gap 112 is formed between any two adjacent perforated metal guard plates 111, and porous sound absorbing material 113 is filled in the gap. The outer surface of the porous sound absorption material is coated with a facing cloth for preventing fibers from leaking.

The two metal perforated panels of the silencing assembly are arranged perpendicular to the ground and parallel to the axis of the ventilation opening and are arranged side by side with the two outer perforated plates of the resistant silencing element.

The thickness of each metal perforated protective panel in the resistive noise elimination element is 1.0mm, the perforation rate of each metal perforated protective panel is 20%, and the aperture of each perforation in each metal perforated protective panel is 3 mm.

The thickness of the resistive silencing element is the sum of the thickness of the two metal perforated protective panels and the thickness of the gap, and the calculation result is 305 mm.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The utility model provides a noise eliminator, its characterized in that sets up in the vent of transformer substation owner become the room, noise eliminator includes: the damping device comprises a resistive damping element and a resistive damping element, wherein the resistive damping element and the resistive damping element are arranged side by side, the resistive damping element is close to a chamber of a main transformer chamber of the transformer substation, and the resistive damping element is far away from the chamber of the main transformer chamber of the transformer substation;

the reactive silencing element comprises two perforated plate groups and a metal blind plate, wherein the two perforated plate groups and the metal blind plate are arranged side by side, each perforated plate group comprises a plurality of perforated plates arranged side by side, a resonant cavity is arranged between any two adjacent perforated plates, and the metal blind plate is arranged between the two perforated plate groups.

2. The muffling device of claim 1, wherein the perforated plate and the metal blind plate in the resistant muffling element are disposed parallel to an axis of the vent.

3. The muffling device of claim 1, wherein each of the sets of perforated plates comprises the same number of perforated plates.

4. The muffling device of claim 1, wherein each of the sets of perforated plates comprises a first perforated plate and a second perforated plate, wherein the first perforated plate and the second perforated plate have different perforation rates.

5. The muffling device of claim 4, wherein the first perforated plate has a perforation rate of 0.2% and the second perforated plate has a perforation rate of 0.1%.

6. A sound-damping arrangement according to claim 1, wherein the resonance chamber comprises a first resonance chamber and a second resonance chamber, wherein the first resonance chamber has a cavity depth of 100mm and the second resonance chamber has a cavity depth of 50 mm.

7. The muffling device of claim 1, wherein each perforated plate has a thickness of 0.6mm to 2.0mm, and wherein the perforations in each perforated plate have a hole diameter of 0.6mm to 2.0 mm.

8. The muffling device of claim 1, wherein the resistive muffling element comprises a plurality of metal perforated facing sheets, wherein a void is present between any two adjacent metal perforated facing sheets, and wherein the void is filled with a porous sound absorbing material.

9. The muffling device of claim 8, wherein the thickness of each of the perforated metal panels is 0.6mm to 2.0mm, the perforation rate of each of the perforated metal panels is 20% to 35%, and the diameter of the perforations in each of the perforated metal panels is 3mm to 5 mm.

10. The muffling device of claim 8, wherein the porous sound absorbing material is externally coated with a fabric to prevent fiber leakage.

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