Double-hole child-mother cavity composite sound absorption assembly and sound absorption partition plate

Abstract

The invention provides a double-hole child-mother cavity composite sound absorption assembly and a sound absorption partition plate, and belongs to the technical field of power equipment noise reduction. The upper panel and the lower bottom plate are arranged in parallel; the upper panel is provided with a first through hole and a second through hole; the four side coamings are vertically connected between the lower bottom plate and the upper panel; and a separator plate; a cuboid cavity is formed among the lower bottom plate, the upper panel and the surrounding plate, the partition plate is arranged in the cuboid cavity, and the partition plate is perpendicularly connected between the lower bottom plate and the upper panel and divides the cuboid cavity into a first cavity and a second cavity which are different in size. The first through hole is communicated with the first cavity, and the second through hole is communicated with the second cavity. According to the double-hole child-mother cavity composite sound absorption assembly and the sound absorption partition plate, the sound absorption coefficient of low-frequency noise at the frequency bands of 100 Hz and 200 Hz can reach 0.8 or above, and the sound absorption coefficient is obviously superior to that of a traditional sound absorption and insulation material; and the sound absorption assembly adopts a modular design, is convenient to assemble and produce in batches, and is suitable for transformer substations, power plants and other scenes with prominent low-frequency noise in specific frequency bands.

Description

Technical Field

[0001] The invention belongs to the technical field of noise reduction of electric power equipment, and more specifically, relates to a double-hole mother-and-child cavity composite sound-absorbing component and a sound-absorbing partition. Background Art

[0002] Substations are important power infrastructure. 500kV main transformers and high-voltage shunt reactors are their main noise sources, and the noise characteristics are concentrated in the low-frequency band (usually below 500Hz). Among them, the noise in the 100Hz, 200Hz and 400Hz frequency bands is particularly obvious. This type of low-frequency noise has the characteristics of long wavelength, strong penetration, and long propagation distance. Traditional sound-absorbing and sound-insulating materials have significant noise reduction effects on medium and high-frequency noise, but their performance in the low-frequency band is poor, and it is difficult to meet the noise reduction needs of low-frequency noise in specific frequency bands. Summary of the invention

[0003] Based on the resonance cavity sound absorption principle, the present invention provides a double-hole mother-and-child cavity composite sound absorption component and a sound absorption baffle, which includes two resonance cavities, a mother cavity and a child cavity, and can produce strong resonance sound absorption effects for 100Hz and 200Hz low-frequency noises through the mother cavity and the child cavity respectively.

[0004] To achieve the above object, the first aspect of the present invention provides a double-hole mother-and-child cavity composite sound absorbing component, comprising:

[0005] Lower base plate;

[0006] An upper panel is arranged parallel to the lower bottom plate; the upper panel is provided with a first through hole and a second through hole;

[0007] Four side panels, vertically connected between the lower bottom plate and the upper panel; and

[0008] Partition; a rectangular cavity is formed between the lower base plate, the upper panel and the enclosure, the partition is arranged in the rectangular cavity, the partition is vertically connected between the lower base plate and the upper panel and divides the rectangular cavity into a first cavity and a second cavity of unequal volumes; the first through hole is connected to the first cavity, and the second through hole is connected to the second cavity.

[0009] Further, the first through hole is arranged on the center line of the first cavity, and the second through hole is arranged on the center line of the second cavity.

[0010] Furthermore, the first cavity and the second cavity are both filled with sound absorbing materials.

[0011] Furthermore, it also includes a protective net, the protective net cover is arranged outside the first through hole and the second through hole, and the protective net is connected to the upper panel.

[0012] Furthermore, the size of the first cavity is: 60 mm in length, 40 mm in width, and 100 mm in height; the size of the second cavity is: 60 mm in length, 20 mm in width, and 100 mm in height.

[0013] Furthermore, the diameter of the first through hole is 4-6 mm, and the diameter of the second through hole is 4-6 mm.

[0014] Furthermore, the sound absorbing component is made of metal, foam ceramic or photosensitive resin material.

[0015] The second aspect of the present invention provides a double-hole mother-and-child cavity composite sound-absorbing baffle, comprising a plurality of sound-absorbing components, a back panel and a frame baffle as described in any of the above items; the lower base plates of the plurality of sound-absorbing components are connected to the back panel, and the plurality of sound-absorbing components are closely arranged on one side of the back panel; the frame baffle is connected to the side of the back panel for fixing the back panel and the plurality of sound-absorbing components.

[0016] Furthermore, a shock-proof gasket is provided between the plurality of sound-absorbing components and the back plate.

[0017] Furthermore, the back plate is any one of a metal plate, a high-density polyethylene plate, and a photosensitive resin plate.

[0018] Compared with the prior art, the present invention has the following technical effects:

[0019] A double-hole mother-and-child cavity composite sound-absorbing component of the present invention has two first cavities and second cavities of unequal volumes, that is, two resonance cavities of a mother cavity and a child cavity, and each resonance cavity is respectively provided with a first through hole and a second through hole connected to the outside world. The sound-absorbing component of the present invention realizes multi-band collaborative noise reduction through two resonance cavities, so that the sound absorption coefficient of the sound-absorbing component of the present invention for low-frequency noise in the 100Hz and 200Hz frequency bands reaches more than 0.8, which is significantly better than traditional sound-absorbing and insulating materials. The sound-absorbing component of the present invention is a double-hole mother-and-child cavity composite sound-absorbing structure designed for low-frequency noise control in a specific frequency band, and is modularly designed, convenient for assembly and mass production, and is suitable for substations, power plants and other scenes with prominent low-frequency noise in specific frequency bands.

[0020] A double-hole mother-and-child cavity composite absorption baffle of the present invention can also achieve a sound absorption coefficient of more than 0.8 for low-frequency noise in the 100Hz and 200Hz frequency bands; the sound absorption component of the double-cavity structure cooperates with the connected backboard to achieve sound absorption and sound insulation functions, thereby enhancing the noise reduction effect; in addition, the sound absorption component in the absorption baffle of the present invention can be modularly quickly assembled or replaced, which is convenient for maintenance; the design structure of the frame baffle enables the absorption baffle of the present invention to adapt to a variety of installation requirements and enhance engineering adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic front view of the structure of a double-hole mother-and-child cavity composite sound absorbing component provided in Example 1 of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of a top view structure, in which a protective net is not shown;

[0024] Figure 3 for Figure 1 A schematic diagram of the cross-sectional structure of ;

[0025] Figure 4 A schematic diagram of the front view structure of a double-hole mother-and-child cavity composite absorption and partition plate provided in Example 2 of the present invention;

[0026] Figure 5 for Figure 4 A side view structural schematic diagram of;

[0027] Figure 6 A curve diagram of the sound absorption coefficient of a double-hole mother-and-child cavity composite absorption partition provided in Example 2 of the present invention.

[0028] Among them, the reference numerals in the figure are:

[0029] 1. Lower base plate, 2. Upper panel, 201. First through hole, 202. Second through hole, 3. Enclosure, 4. Partition, 5. First cavity, 6. Second cavity, 7. Protective net, 8. Back plate, 9. Frame baffle, 10. Sound absorbing component. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or position relationship indicated by terms such as "length", "up", "down", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0034] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. For example, without departing from the scope of the embodiments of the present invention, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0035] Example 1

[0036] See also Figure 1-Figure 3 Now, a double-hole mother-and-child cavity composite sound absorbing component provided by an embodiment of the present invention is described.

[0037] In one embodiment of the present invention, a double-hole mother-and-child cavity composite sound absorbing component 10 of the embodiment of the present invention comprises a lower bottom plate 1, an upper panel 2, four side panels 3 and a partition 4. The upper panel 2 is arranged in parallel with the lower bottom plate 1; the upper panel 2 is provided with a first through hole 201 and a second through hole 202; the four side panels 3 are vertically connected between the lower bottom plate 1 and the upper panel 2; a rectangular parallelepiped cavity is formed between the lower bottom plate 1, the upper panel 2 and the partition 3, and the partition 4 is arranged in the rectangular parallelepiped cavity, and the partition 4 is vertically connected between the lower bottom plate 1 and the upper panel 2 and divides the rectangular parallelepiped cavity into a first cavity 5 and a second cavity 6 of unequal volumes; the first through hole 201 is connected to the first cavity 5, and the second through hole 202 is connected to the second cavity 6.

[0038] like Figure 1-3As shown, the sound absorbing assembly 10 of the embodiment of the present invention comprises a first cavity 5 and a second cavity 6 of different volumes. The first cavity 5 and the second cavity 6 have the same height and length, but different widths. The width of the first cavity 5 is greater than the width of the second cavity 6. The first cavity 5 is used as a mother cavity and is mainly used to reduce the low-frequency noise of 100 Hz. The second cavity 6 is used as a sub-cavity and is mainly used to reduce the low-frequency noise of 200 Hz. When in use, the openings of the first through hole 201 and the second through hole 202 are directed toward the noise source to improve the sound absorption efficiency.

[0039] A double-hole mother-and-child cavity composite sound-absorbing component 10 of an embodiment of the present invention has two first cavities 5 and second cavities 6 of unequal volumes, that is, two resonant cavities of a mother cavity and a child cavity, and each resonant cavity is respectively provided with a first through hole 201 and a second through hole 202 connected to the outside. The sound-absorbing component 10 of the embodiment of the present invention realizes multi-band collaborative noise reduction through two resonant cavities, so that the sound absorption coefficient of the sound-absorbing component 10 of the embodiment of the present invention for low-frequency noise in the 100Hz and 200Hz frequency bands reaches more than 0.8, which is significantly better than traditional sound-absorbing and insulating materials.

[0040] Further, in the embodiment of the present invention, the first through hole 201 is disposed on the center line of the first cavity 5, and the second through hole 202 is disposed on the center line of the second cavity 6. That is, the first through hole 201 and the second through hole 202 are respectively disposed at the center position of the side of the first cavity 5 and the second cavity 6 facing the noise source to improve the sound absorption efficiency.

[0041] Furthermore, in the embodiment of the present invention, the first cavity 5 and the second cavity 6 are both filled with sound absorbing materials to further enhance the noise reduction performance of the sound absorbing assembly 10 .

[0042] Furthermore, in the embodiment of the present invention, the sound absorbing component 10 further includes a protective net 7, which is arranged outside the first through hole 201 and the second through hole 202, and is connected to the upper panel 2. The protective net 7 can prevent foreign matter from entering the first cavity 5 and the second cavity 6 through the first through hole 201 and the second through hole 202, and can also prevent foreign matter from blocking the first through hole 201 and the second through hole 202, so that the sound absorbing component 10 can eliminate foreign matter interference and maintain good sound absorption and noise reduction performance during use. Preferably, the distance between the mesh surface of the protective net 7 and the upper panel 2 is 10-30 mm, so as to avoid the steel wire of the protective net 7 from being closely attached to the position of the first through hole 201 and the second through hole 202, thereby affecting the sound absorption effect of the sound absorbing component 10.

[0043] In the embodiment of the present invention, the design of the sound absorbing component 10 can be carried out according to the following steps:

[0044] (1) Measure the noise source through spectrum analysis and determine the sound pressure level in the 100 Hz and 200 Hz frequency bands;

[0045] (2) The cavity size and shape of the sound absorbing component 10 are optimized through simulation to match the target frequency and enhance the sound absorption effect. Specifically, the size and shape of the first cavity 5 are designed based on 100Hz low-frequency noise, and the size of the first cavity 5 is: 60mm long, 40mm wide, and 100mm high; the size and shape of the second cavity 6 are designed based on 200Hz low-frequency noise, and the size of the second cavity 6 is 60mm long, 20mm wide, and 100mm high. The diameter of the first through hole 201 is 4-6mm, and the diameter of the second through hole 202 is 4-6mm.

[0046] The sound absorbing component 10 of the embodiment of the present invention can be made of metal, foam ceramic or photosensitive resin material. The metal can be ordinary steel plate, aluminum plate, stainless steel plate, etc. The sound absorbing component 10 of the embodiment of the present invention can be produced by using a precision mold.

[0047] The embodiment of the present invention optimizes the cavity structure of the sound absorbing component 10, and opens the first through hole 201 and the second through hole 202 on the upper panel 2, and optimizes the size and position of the openings, so that the sound absorbing component 10 of the embodiment of the present invention can effectively control the low-frequency noise of the substation, so that the sound absorption coefficient of the low-frequency noise in the 100Hz and 200Hz frequency bands reaches more than 0.8, which is significantly better than traditional sound-absorbing and insulating materials. The sound absorbing component 10 of the embodiment of the present invention is a double-hole mother-and-child cavity composite sound absorbing structure designed for the control of low-frequency noise in a specific frequency band, and is modularly designed, which is convenient for assembly and mass production, and is suitable for substations, power plants and other scenes with prominent low-frequency noise in a specific frequency band.

[0048] Example 2

[0049] The embodiment of the present invention provides a double-hole mother-child cavity composite suction and partition plate, the structure of which is as follows: Figure 4 , Figure 5 As shown, the sound absorbing baffle includes multiple sound absorbing components 10, a back plate 8 and a frame baffle 9 as described in Example 1; the lower base plates 1 of the multiple sound absorbing components 10 are connected to the back plate 8, and the multiple sound absorbing components 10 are closely arranged on one side of the back plate 8; the frame baffle 9 is connected to the side of the back plate 8, and is used to fix the back plate 8 and the multiple sound absorbing components 10.

[0050] The back plate 8 of the sound absorption partition of the present embodiment is connected to a plurality of arrays of sound absorption components 10, and the plurality of sound absorption components 10 are fixed in the middle area surrounded by the back plate 8 and the frame baffle 9, and the two resonance cavities of the sound absorption component 10 are also fixed and sealed by the back plate 8 and the frame baffle 9. The back plate 8 of the present embodiment can be a metal plate or a high-density non-metal plate, the metal plate can be an ordinary steel plate, an aluminum plate, a stainless steel plate, etc., and the non-metal plate can be any one of a high-density polyethylene plate and a photosensitive resin plate. The back plate 8 provides a sound insulation function and fixes the sound absorption component 10 to enhance the stability of the structure. The design of the back plate 8 takes into account both strength and sound insulation performance to meet the requirements of different installation scenarios.

[0051] The frame baffle 9 of this embodiment can be modularly designed to facilitate assembly and disassembly, ensuring the stability of the connection between the sound absorbing component 10 and the back plate 8. The sound absorbing component 10 can be connected to the back plate 8 by gluing or slot connection.

[0052] Furthermore, in the embodiment of the present invention, a shock-absorbing gasket is provided between the plurality of sound-absorbing components 10 and the back plate 8 to reduce vibration conduction.

[0053] When the suction partition plate of the embodiment of the present invention is used, it is installed according to the following steps:

[0054] (1) Construction preparation: Arrange the suction baffles according to the location of the noise source and ensure that the opening faces the noise source.

[0055] (2) Fixing method: The suction partition is connected to the supporting structure by bolts or slots, and the position is adjusted to ensure its stability.

[0056] (3) Debugging and verification: Optimize the angle and position of the baffles through acoustic testing to achieve the best noise reduction effect.

[0057] The sound absorption coefficient curve of the absorption baffle of the embodiment of the present invention is as follows: Figure 6 As shown, Figure 6 The vertical axis is the sound absorption coefficient. Figure 6 It can be seen that the sound absorption coefficient of the absorption baffle plate in the embodiment of the present invention can reach above 0.8 for low-frequency noise in the frequency bands of 100 Hz and 200 Hz, and has a significant low-frequency sound absorption and noise reduction effect.

[0058] A double-hole mother-and-child cavity composite absorption baffle in an embodiment of the present invention can also achieve a sound absorption coefficient of more than 0.8 for low-frequency noise in the 100Hz and 200Hz frequency bands; the double-cavity structure sound absorption component 10 cooperates with the connected back plate 8 to achieve sound absorption and sound insulation functions and enhance the noise reduction effect; in addition, the sound absorption component 10 in the absorption baffle in an embodiment of the present invention can be modularly quickly assembled or replaced for easy maintenance; the design structure of the frame baffle 9 enables the absorption baffle in an embodiment of the present invention to adapt to a variety of installation requirements and enhance engineering adaptability.

[0059] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A double-hole mother-and-child cavity composite sound-absorbing component, characterized in that: include: Lower base plate; An upper panel is arranged parallel to the lower bottom plate; the upper panel is provided with a first through hole and a second through hole; Four side panels, vertically connected between the lower bottom plate and the upper panel; as well as, A partition; a rectangular cavity is formed between the lower bottom plate, the upper panel and the enclosure, the partition is arranged in the rectangular cavity, the partition is vertically connected between the lower bottom plate and the upper panel and divides the rectangular cavity into a first cavity and a second cavity of unequal volumes; The first through hole is communicated with the first cavity, and the second through hole is communicated with the second cavity.

2. A double-hole mother-and-child cavity composite sound-absorbing component as claimed in claim 1, characterized in that: The first through hole is disposed on a center line of the first cavity, and the second through hole is disposed on a center line of the second cavity.

3. A double-hole mother-and-child cavity composite sound-absorbing component as claimed in claim 1, characterized in that: The first cavity and the second cavity are both filled with sound absorbing materials.

4. A double-hole mother-and-child cavity composite sound-absorbing component as claimed in claim 1, characterized in that: It also includes a protection net, which is arranged outside the first through hole and the second through hole, and is connected to the upper panel.

5. A double-hole mother-and-child cavity composite sound-absorbing component as claimed in claim 2, characterized in that: The size of the first cavity is: 60 mm in length, 40 mm in width, and 100 mm in height; the size of the second cavity is: 60 mm in length, 20 mm in width, and 100 mm in height.

6. A double-hole mother-and-child cavity composite sound-absorbing component as claimed in claim 2, characterized in that: The diameter of the first through hole is 4-6 mm, and the diameter of the second through hole is 4-6 mm.

7. A double-hole mother-and-child cavity composite sound-absorbing component according to any one of claims 1 to 6, characterized in that: The sound absorbing component is made of metal, foam ceramic or photosensitive resin material.

8. A double-hole mother-child cavity composite suction partition, characterized in that: It comprises a plurality of sound absorbing components, a back plate and a frame baffle as described in any one of claims 1 to 7; the lower base plates of the plurality of sound absorbing components are connected to the back plate, and the plurality of sound absorbing components are closely arranged on one side of the back plate; the frame baffle is connected to the side of the back plate to fix the back plate and the plurality of sound absorbing components.

9. A double-hole mother-child cavity composite suction and partition plate as claimed in claim 8, characterized in that: Anti-vibration gaskets are also arranged between the plurality of sound absorbing components and the back plate.

10. A double-hole mother-child cavity composite suction and partition plate as claimed in claim 8, characterized in that: The back plate is any one of a metal plate, a high-density polyethylene plate, and a photosensitive resin plate.

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