CN115083379A

CN115083379A - Helmholtz resonator, noise damping device and electromechanical device

Info

Publication number: CN115083379A
Application number: CN202110261089.7A
Authority: CN
Inventors: 韩啸; 严熙成; 林宇震; 张弛
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2022-09-20

Abstract

The invention relates to the field of noise control, and provides a Helmholtz resonator, a noise elimination device and an electromechanical device, which comprise: the device comprises a shell, a sound inlet, a sound outlet and a resonant cavity, wherein the resonant cavity is formed inside the shell; the neck pipe is arranged on the shell and comprises an inlet pipe section and a plurality of outlet pipe sections, one end of the inlet pipe section is communicated with the sound inlet, the other end of the inlet pipe section is connected with the plurality of outlet pipe sections in parallel, a set included angle is formed between the inlet pipe section and any one of the outlet pipe sections, and the outlet pipe sections are communicated with the resonant cavity. The noise elimination device comprises at least two Helmholtz resonators, and each Helmholtz resonator is sequentially connected to form a circular ring structure. On the premise of not considering the wall thickness, the theoretical minimum thickness of the Helmholtz resonator is not mainly determined by the total length of the neck pipe, but is determined by the length of the inlet pipe section, the height of the outlet pipe section, the angle of the set included angle and other factors; the design can greatly reduce the thickness of the Helmholtz resonator.

Description

Helmholtz resonator, noise damping device and electromechanical device

Technical Field

The invention relates to the technical field of noise control, in particular to a Helmholtz resonator, a noise elimination device and an electromechanical device.

Background

A helmholtz resonator is a basic acoustic unit consisting of a closed resonance chamber and a connected neck. When sound waves are incident, the air in the neck tube can be regarded as a mass to vibrate integrally, and the air in the closed cavity undergoes expansion and contraction changes due to the vibration of the air in the neck tube, so that the Helmholtz resonator can be regarded as a spring-mass system with a damping term. When the incident frequency of the sound wave reaches the natural frequency of the system, the resonator resonates, and the sound absorption effect is good.

For the helmholtz resonator unit, the sound absorption frequency depends on the volume of the closed cavity, the length of the neck pipe and the cross-sectional area of the neck pipe, and in order to obtain low-frequency sound absorption, measures such as increasing the volume of the closed cavity, lengthening the length of the neck pipe and reducing the cross-sectional area of the neck pipe can be taken. In general, it is difficult to freely change the volume of the resonant cavity in practical situations due to the limitation of the space used; while at the same time, changing the neck characteristics of the resonator is easier to handle and also enables the resonant frequency and resonant sound absorption coefficient to be changed simultaneously. Many researchers have worked to investigate the effect of neck characteristics on the sound absorption characteristics of helmholtz resonators, for example, Tang and Sirignano found the greatest sound absorption coefficient when the resonator neck length is compared to the sound wave wavelength by varying the resonator neck length. Selamet and Lee have studied the extension of the neck of the resonator into the cavity, and their conclusion shows that the extension of the neck into the cavity can lower the resonant frequency of the resonator without increasing the cavity volume. The shape of the neck has been studied by the scholars and it has been found that the cross-section of the neck is circular, square, oval or other shape and has little effect on the sound absorption of the resonator. However, in all the above studies, no matter what the change is made to the neck, the thickness of the resonator is increased along the direction of sound wave incidence in order to satisfy the arrangement of the internal neck, so that the overall thickness of the helmholtz resonator is still large; and the thickness of the Helmholtz resonator is limited by the total length of the neck, which brings inconvenience to engineering application.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a Helmholtz resonator, which solves the problems that the thickness of the existing Helmholtz resonator is large and is limited by the total length of a neck pipe.

The invention also provides a silencing device.

The invention also provides an electromechanical device.

A helmholtz resonator according to an embodiment of the first aspect of the invention includes:

the device comprises a shell, a sound inlet, a sound outlet and a resonant cavity, wherein the resonant cavity is formed inside the shell;

the neck pipe, with the casing is connected, the neck pipe includes entry pipeline section and many export pipeline sections, entry pipeline section one end intercommunication advance the sound mouth, many parallelly connected of the other end the export pipeline section, the entry pipeline section with arbitrary all be the settlement contained angle between the export pipeline section, just export pipeline section intercommunication the resonant cavity.

The neck pipe comprises the inlet pipe section and a plurality of outlet pipe sections, and a set included angle is formed between the inlet pipe section and any one of the outlet pipe sections; the theoretical minimum thickness of the helmholtz resonator is no longer determined by the total length of the neck tube, but by the length of the inlet tube section, the height of the outlet tube section and the angle of the set angle, without taking into account wall thickness; the design can greatly reduce the thickness of the Helmholtz resonator.

The inlet pipe section is connected with the plurality of outlet pipe sections in parallel, and the height of each outlet pipe section can be reduced by the design on the premise of ensuring the same sound absorption effect; further reducing the thickness of the Helmholtz resonator.

According to one embodiment of the invention each of said outlet pipe sections is of the same size.

According to one embodiment of the invention, the number of the outlet pipe sections is two, and the two outlet pipe sections are positioned on the same straight line.

According to one embodiment of the invention each of said outlet pipe sections is arranged at a 90 ° angle to said inlet pipe section.

According to one embodiment of the invention the axes of all the outlet pipe sections are located in the same plane.

According to one embodiment of the invention the sum of the cross-sectional areas of all the outlet pipe sections is equal to the cross-sectional area of the sound inlet.

According to one embodiment of the invention, the cross-sectional shape of the outlet pipe section is circular, square or oval.

According to one embodiment of the invention, the mounting surface of the housing is rectangular, circular arc-shaped, circular ring-shaped or wave-shaped.

According to a second aspect of the present invention, the silencer device includes at least two helmholtz resonators as described in the above embodiments, the mounting surface is in a circular arc shape, and each helmholtz resonator is sequentially connected to form a circular ring structure.

According to the silencer device of the embodiment of the present invention, since the silencer device includes the helmholtz resonator, all technical effects of the helmholtz resonator are achieved, and details are not repeated here.

According to the electromechanical device of the embodiment of the third aspect of the present invention, the helmholtz resonator described in any one of the embodiments is included in the housing of the electromechanical device.

The electromechanical device according to the embodiment of the present invention includes the helmholtz resonator, so that all technical effects of the helmholtz resonator are achieved, and details thereof are not repeated herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a helmholtz resonator according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of another helmholtz resonator provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another helmholtz resonator according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a muffler assembly according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an electromechanical device according to an embodiment of the present invention;

reference numerals:

1. a housing; 11. a sound inlet; 2. a neck tube; 21. an inlet pipe section; 22. a first outlet tube section; 221. a first sound outlet; 23. a second outlet tube section; 231. a second sound outlet; 3. a resonant cavity; 4. an electromechanical device body.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

As shown in fig. 1, according to an embodiment of the first aspect of the present invention, there is provided a helmholtz resonator including a housing 1 and a neck 2, the neck 2 being connected to the housing 1. The shell 1 is provided with a sound inlet 11, and a resonant cavity 3 is formed inside the shell 1; the neck pipe 2 comprises an inlet pipe section 21 and a plurality of outlet pipe sections, one end of the inlet pipe section 21 is communicated with the sound inlet 11, the other end of the inlet pipe section is connected with the plurality of outlet pipe sections in parallel, a set included angle is formed between the inlet pipe section 21 and any one of the outlet pipe sections, and the outlet pipe sections are communicated with the resonant cavity 3.

The neck pipe 2 comprises an inlet pipe section 21 and a plurality of outlet pipe sections, and a set included angle is formed between the inlet pipe section 21 and any one of the outlet pipe sections; on the premise of not considering the wall thickness, the theoretical minimum thickness of the Helmholtz resonator is not mainly determined by the total length of the neck pipe 2, but is determined by the length of the inlet pipe section 21, the height of the outlet pipe section, the angle of the set included angle and other factors; the design can greatly reduce the thickness of the Helmholtz resonator.

The inlet pipe section 21 is connected with a plurality of outlet pipe sections in parallel, and the height of each outlet pipe section can be reduced by the design on the premise of ensuring the same sound absorption effect; the thickness of the helmholtz resonator is further reduced.

According to one embodiment of the present invention, as shown in fig. 1 to 3, the inlet pipe segment 21 is a short pipe segment, the outlet pipe segment is a long pipe segment, one inlet pipe segment 21 is connected in parallel with a plurality of outlet pipe segments, and each outlet pipe segment extends along the non-acoustic wave incidence direction. The total length of the neck 2 is the sum of the length of the inlet pipe section 21 and the length of any outlet pipe section connected thereto; the length of each outlet pipe section is one or more times the length of the inlet pipe section 21.

According to one embodiment of the present invention, as shown in fig. 1, 3 and 4, a neck 2 is separately provided outside the housing 1, and the neck 2 is located in the resonance cavity 3. In this embodiment, the neck tube 2 is connected to the housing 1 as an independent body, which facilitates maintenance and replacement of the neck tube 2.

According to another embodiment of the present invention, as shown in fig. 2, a neck 2 is formed in a sidewall of the case 1. In this embodiment, the length of the inlet pipe section 21 is a part of the wall thickness of the housing 1, and the theoretical minimum thickness of the entire helmholtz resonator is determined by the wall thickness of the housing 1 and the thickness of the resonance chamber 3.

According to one of the embodiments of the invention, each outlet pipe section is of the same size. In this embodiment, each outlet pipe section is designed to have the same size, which facilitates calculation of the characteristic frequency of the helmholtz resonator.

As shown in fig. 1-3, the first outlet tube section 22 and the second outlet tube section 23 are the same size. Of course, the dimensions of each outlet pipe section may vary, and the invention is not limited to the examples set forth herein.

According to one embodiment of the invention, the number of outlet pipe sections is two, and the two outlet pipe sections are located on the same line.

As shown in fig. 1, the neck 2 comprises an inlet pipe section 21, a first outlet pipe section 22 and a second outlet pipe section 23 arranged in the resonance chamber 3. One end of the inlet pipe section 21 is communicated with the sound inlet 11, the other end of the inlet pipe section is connected with the first outlet pipe section 22 and the second outlet pipe section 23 in parallel, and the first outlet pipe section 22 and the second outlet pipe section 23 are positioned on the same straight line.

As shown in fig. 2, an inlet pipe section 21, a first outlet pipe section 22 and a second outlet pipe section 23 are formed in the side wall of the housing 1, a first sound outlet 221 and a second sound outlet 231 are formed on the inner wall of the housing 1, and the first sound outlet 221 communicates with the first outlet pipe section 22 and the resonant cavity 3; the second sound outlet 231 communicates the second outlet tube section 23 and the resonance chamber 3. The first outlet pipe section 22 and the second outlet pipe section 23 are located on the same line.

The larger the number of outlet pipe sections, the more the height of each outlet pipe section can be reduced, and the smaller the theoretical minimum thickness of the Helmholtz resonator is; however, installing too many outlet pipe sections results in a larger spatial configuration of the helmholtz resonator. The parallel connection of the inlet pipe section 21 and the two outlet pipe sections is only one preferred embodiment of the present invention, and other embodiments of the present invention are not limited by this preferred embodiment. The resonance chamber 3 or the side wall of the housing 1 may comprise three or more outlet pipe sections, which are connected in parallel to the inlet pipe section 21.

Similarly, it is a preferred embodiment of the present invention that the inlet pipe segment 21 is connected in parallel with two outlet pipe segments located on the same line, and other embodiments of the present invention are not limited to this preferred embodiment, as shown in fig. 3, the first outlet pipe segment 22 and the second outlet pipe segment 23 are arranged in a circular arc shape.

According to one embodiment of the invention, each outlet pipe section is set at an angle of 90 ° to the inlet pipe section 21.

As shown in fig. 1 and 2, the first outlet pipe section 22 and the second outlet pipe section 23 are both arranged at 90 ° to the inlet pipe section 21. Of course, the set angle between each outlet pipe segment and the inlet pipe segment 21 can be any value from 0 ° to 180 °, and the present invention is not limited by the examples herein.

As shown in fig. 3, the first outlet pipe section 22 and the second outlet pipe section 23 are both arranged in an arc shape, and at different positions of the first outlet pipe section 22, the set included angles of the pipe sections and the inlet pipe section 21 are different; the second outlet pipe section 23 is the same and will not be described further here.

According to one of the embodiments of the invention, as shown in fig. 1 to 3, the axes of all outlet pipe sections are located on the same plane.

Of course, the invention is not limited to the examples herein, and the axis of each outlet pipe section may not be on one plane, for example, the outlet pipe section may extend circumferentially in a wave or spiral shape.

According to one of the embodiments of the invention, the sum of the cross-sectional areas of all outlet pipe sections is equal to the cross-sectional area of the sound inlet 11. By adopting the design, the design steps of the outlet pipe section can be simplified.

According to one of the embodiments of the invention, the cross-sectional shape of the outlet pipe section is circular, polygonal or elliptical. Of course, the cross-sectional shape of the outlet tube section is not limited by this example.

As shown in fig. 1 to 3, each of the outlet pipe sections has the same cross-sectional shape as the inlet pipe section 21, and their cross-sectional shape is determined by the characteristic frequency of the helmholtz resonator or the volume of the resonance chamber 3.

According to one of the embodiments of the invention, the housing 1 and the neck 2 are made of metal, plastic, concrete or glass material. Of course, the material of the shell 1 and the neck 2 is not limited by this example.

According to one embodiment of the present invention, as shown in fig. 1 to 4, the surface of the casing 1 on which the sound inlet 11 is provided is a mounting surface, and the shape of the mounting surface includes, but is not limited to, a rectangle, an arc, a circular ring, or a wave. Since the thickness of the Helmholtz resonator is no longer limited by the total length of the neck 2, the housing 1 can be made in a sheet-like or circular-arc configuration. Such Helmholtz resonators can be used as noise reduction devices to be fitted on the housing of a domestic appliance or an electromechanical device; compared with other noise reduction devices, the Helmholtz resonator occupies smaller space and has wider application range.

According to an embodiment of the second aspect of the present invention, as shown in fig. 4, there is provided a sound-damping device comprising at least two helmholtz resonators according to any one of the above embodiments, wherein the housing 1 has a circular arc-shaped mounting surface, and each helmholtz resonator is connected to form a circular ring structure. The noise eliminator of the embodiment of the invention can be used as a noise eliminator of electromechanical devices, household appliances or walls; compared with other noise reduction devices, the noise eliminator has the characteristics of simple structure, small occupied space and high cost performance.

According to an embodiment of the third aspect of the present invention, there is provided an electromechanical device comprising a helmholtz resonator as defined in any one of the embodiments above in a housing of the electromechanical device.

As shown in fig. 5, the electromechanical device includes an electromechanical device body 4, a helmholtz resonator is housed in the electromechanical device body 4, and a mounting surface of the housing 1 of the helmholtz resonator is annular.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims

1. A helmholtz resonator, comprising:

the device comprises a shell (1) and a sound inlet (11), wherein a resonant cavity (3) is formed inside the shell (1);

neck (2), with casing (1) is connected, neck (2) are including entry pipeline section (21) and many export pipeline sections, entry pipeline section (21) one end intercommunication sound inlet (11), many parallelly connected of the other end export pipeline section, entry pipeline section (21) and arbitrary all are the settlement contained angle between the export pipeline section, just export pipeline section intercommunication resonant cavity (3).

2. A helmholtz resonator according to claim 1, characterized in that each of the outlet pipe sections is of the same size.

3. A helmholtz resonator according to claim 2, characterized in that the number of outlet pipe sections is two and the two outlet pipe sections are located on the same line.

4. Helmholtz resonator according to claim 3, characterized in that each outlet tube section is at a set angle of 90 ° to the inlet tube section (21).

5. A helmholtz resonator according to claim 1, characterized in that the axes of all the outlet pipe sections lie in the same plane.

6. Helmholtz resonator according to claim 1, characterized in that the sum of the cross-sectional areas of all the outlet pipe sections is equal to the cross-sectional area of the inlet port (11).

7. A helmholtz resonator according to claim 1, characterized in that the cross sectional shape of the outlet pipe section is circular, square or elliptical.

8. Helmholtz resonator according to any of the claims 1-7, characterized in that the mounting surface of the housing (1) is rectangular, circular or wave-shaped.

9. A muffling apparatus comprising at least two helmholtz resonators according to claim 8, wherein said mounting surface has an arc shape, and wherein each of said helmholtz resonators is connected in sequence to form a circular ring structure.

10. An electromechanical device, characterized in that a helmholtz resonator according to any one of claims 1-8 is comprised in a housing of the electromechanical device.