Impedance silencing plate

Abstract

The utility model provides an impedance muffling plate which comprises a shell and a muffling component arranged in the shell, the shell is a metal shell or a non-metal shell, the impedance muffling plate is characterized in that the muffling component comprises a base body and a muffling component arranged in the base body, the base body can be made of a soft material or a hard material, and the base body is made of a metal material or a hard material. The sound barrier shell comprises a base body and a silencing assembly, the silencing assembly is inserted into the base body in a penetrating mode, a plurality of silencing units are arranged in the silencing assembly, and the silencing units are variable cross-section silencing cavities penetrating through the silencing assembly. Noise is reduced when passing through the impedance noise elimination unit, the purpose of noise elimination and reduction is achieved, experimental tests prove that the noise reduction coefficient of the impedance noise elimination plate reaches 0.95-1.0, and the impedance noise elimination plate has great application and popularization value.

Description

Technical Field

[0001] This utility model relates to a noise protection device, and more particularly to an impedance silencing plate. Background Technology

[0002] Sound barriers, also known as noise walls, are structures placed between a sound source and a receiver to significantly attenuate sound wave propagation, thereby reducing noise pollution in a defined area. They are primarily used for noise reduction on highways, expressways, elevated roads, and other noise sources. Sound barriers are categorized into purely sound-insulating reflective barriers and composite barriers that combine sound absorption and insulation; the latter is considered a more effective method. Highways and expressways are where all types of sound barriers are most commonly used.

[0003] Sound barriers can generally be divided into vertical sound barriers and fully enclosed sound barriers according to their structural form. Vertical sound barriers generally consist of steel profiles and sound barrier panels set between adjacent steel profiles. Sound barrier panels can be divided into metal panels and non-metal panels. Regardless of whether the panels are metal or non-metal, there is still a lot of room for improvement in their sound absorption coefficient. Therefore, how to improve their sound absorption coefficient is always a research hotspot in this industry. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an impedance silencing plate.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] An impedance silencing plate includes a shell and a silencing component disposed within the shell. The shell can be a metal shell or a non-metal shell. The silencing component includes a base and several silencing units disposed within the base. The base can be a soft material base or a hard material base. The silencing units are inserted through the base. Each silencing unit is a shell containing a variable cross-section silencing cavity.

[0007] Preferably, the soft material matrix is ​​a glass wool matrix, a rock wool matrix, or a melamine matrix.

[0008] Preferably, the rigid material matrix is ​​a perlite matrix or an aluminum foam matrix.

[0009] Preferably, the variable cross-section cavity includes an opening, a gradually expanding sound-absorbing structure one, a cylindrical channel one, a gradually expanding sound-absorbing structure two, and several cylindrical channels two.

[0010] Preferably, the opening is a flared opening.

[0011] Preferably, the gradually expanding sound-absorbing structure is a frustum-shaped structure with an increasing diameter.

[0012] Preferably, the extension lines of the plurality of cylindrical channels II do not intersect with the extension lines of cylindrical channel I.

[0013] Preferably, the cylindrical channel one is provided with an annular cavity, and the cross-section of the annular cavity is larger than the cross-section of the cylindrical channel one.

[0014] Preferably, the cylindrical channel one or cylindrical channel two is selected as a cylindrical cavity, a square cylindrical cavity, or a triangular cylindrical cavity.

[0015] The beneficial effects of this utility model are as follows: The impedance silencing plate provided by this utility model improves the structure of the silencing component inside the sound barrier shell. By setting multiple silencing units on the silencing component, noise is reduced when it passes through the silencing unit, thus improving the sound absorption effect and achieving the purpose of noise reduction. Experimental tests have shown that the noise reduction coefficient of this impedance silencing plate reaches 0.95~1.0, and it has great value for promotion and application. Attached Figure Description

[0016] Figure 1 This is a structural breakdown diagram of the sound barrier constructed according to this utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of the impedance silencing plate.

[0018] Figure 3 for Figure 2 Enlarged structural diagram of section A;

[0019] Figure 4 This is a schematic diagram of the noise reduction unit structure;

[0020] Figure 5 for Figure 4 A schematic diagram of the explosion structure. Detailed Implementation

[0021] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 , 2As shown in Figure 3, this utility model provides an impedance silencing panel, which includes a shell 7 and silencing components disposed within the shell 7. The shell is generally selected as a metal shell or a non-metal shell. The metal shell can be selected as a stainless steel shell, a galvanized steel shell, or a metal aluminum shell. The shell can be integrally formed or snap-fit ​​formed. The non-metal shell can be a hollow cement board, a hollow plastic steel board, etc., and is generally cast or injection molded. The silencing components include a substrate 6 and several silencing units disposed within the substrate 6. The substrate 6 can be selected as a soft substrate or a hard substrate. Specifically, the soft substrate is a glass wool substrate, a rock wool substrate, or a melamine substrate, and the hard substrate is a porous perlite substrate or a foamed aluminum substrate. The silencing units are inserted through the base and arranged in several rows, with several silencing units in each row. The silencing unit is a shell containing a variable cross-section silencing cavity. Specifically, the silencing unit is injection molded from plastic or pressed and bent from a metal plate. The silencing unit can be integrally molded or assembled from several modules. The variable cross-section silencing cavity includes, from front to back, an opening 1, a gradually expanding silencing structure 1 2, a cylindrical channel 1 3, a gradually expanding silencing structure 2 4, and several cylindrical channels 2 5. The opening 1 of the variable cross-section silencing cavity is located on the front side of the impedance silencing plate, and the cylindrical channels 2 5 are located on the back side of the impedance silencing plate.

[0023] To better focus noise waves into the impedance silencing unit, opening 1 is designed as a horn opening, facing the sound-facing surface. The horn opening is wider at the outside and narrower at the inside. This structure has a sound wave converging effect, maximizing sound wave incidence. After passing through the smallest diameter of the horn opening, the sound wave enters the gradually expanding silencing structure 2. The gradually expanding silencing structure 2 is connected at the smallest diameter of the horn opening. The gradually expanding silencing structure 2 is a frustum-shaped structure with a diameter that gradually increases along the direction of sound wave propagation until it reaches its maximum diameter. When the sound wave encounters the cylindrical channel 3, which is connected to the maximum diameter of the gradually expanding silencing structure 2, the diameter of the cylindrical channel 3 is smaller than the maximum diameter of the gradually expanding silencing structure 2, approximately between 1 / 2 and 1 / 4 of the maximum diameter. When the sound wave encounters the abrupt change in the diameter cross-section, the cross-sectional impedance is large, which will cause impedance mismatch and thus reduce noise. Experiments have shown that the noise reduction effect is best when the diameter of the cylindrical channel 3 is 1 / 3 of the maximum diameter of the gradually expanding silencing structure 2.

[0024] To further enhance the noise reduction effect, an annular cavity 31 is provided in the middle of the cylindrical channel 3. The annular cavity 31 is connected to the cylindrical channel 3, and its cross-section is larger than that of the cylindrical channel 3. When sound waves enter the annular cavity 31 along the cylindrical channel 3, the air column at the entrance of the annular cavity 31 and the air column inside the annular cavity 31 form a gas resonance system. When the noise frequency is equal to the natural frequency of this gas resonance system, a resonance effect will occur. During resonance, the air and the inner wall generate intense friction, and the sound energy is consumed by overcoming the frictional resistance, thereby reducing the noise. Figure 5 As shown, the annular cavity 31 can be configured as a cylindrical or irregular cylindrical shape, and the length of the annular cavity can be close to the length of the cylindrical channel 1. It can accommodate, absorb and weaken noise to the maximum extent. It has been verified that this structure is mainly used to reduce noise in the low frequency band.

[0025] Following cylindrical channel 3 is a gradually expanding silencing structure 4. Sound waves enter the gradually expanding silencing structure 4 through the opening of cylindrical channel 1. The inner diameter gradually increases and the impedance gradually decreases. When the sound waves encounter the cross-sections of several cylindrical channels 5 again, since the extension lines of these cylindrical channels 5 do not intersect with the extension lines of cylindrical channel 3, the sound waves avoid direct passage through the silencing unit when they encounter the cross-sections. The sound wave impedance suddenly increases, further weakening the noise.

[0026] As a specific option, the cavities of cylindrical channel 1 3 and cylindrical channel 2 5 can be cylindrical cavities, square cylindrical cavities, or triangular cylindrical cavities.

[0027] The embodiments described above are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.

Claims

1. An impedance silencing panel, comprising a housing and a silencing component disposed within the housing, wherein the housing is a metal housing or a non-metal housing, characterized in that, The silencing component includes a substrate and several silencing units disposed inside the substrate. The substrate may be a soft material substrate or a hard material substrate. The silencing units are inserted through the substrate. Each silencing unit is a shell containing a variable cross-section silencing cavity.

2. The impedance silencing plate according to claim 1, characterized in that, The soft material matrix is ​​a glass wool matrix, a rock wool matrix, or a melamine matrix.

3. The impedance silencing plate according to claim 1, characterized in that, The hard material matrix is ​​a perlite matrix or an aluminum foam matrix.

4. The impedance silencing plate according to claim 1, characterized in that, The variable cross-section silencing cavity includes an opening, a gradually expanding silencing structure I, a cylindrical channel I, a gradually expanding silencing structure II, and several cylindrical channels II.

5. The impedance silencing plate according to claim 4, characterized in that, The opening is a funnel shape.

6. The impedance silencing plate according to claim 4, characterized in that, The gradually expanding sound-absorbing structure is a frustum-shaped structure with an increasing diameter.

7. The impedance silencing plate according to claim 4, characterized in that, The extension lines of the several cylindrical channels II do not intersect with the extension lines of the cylindrical channel I.

8. The impedance silencing plate according to claim 4, characterized in that, The cylindrical channel has an annular cavity inside, and the cross-section of the annular cavity is larger than the cross-section of the cylindrical channel.

9. The impedance silencing plate according to claim 4, characterized in that, The cylindrical channel one or cylindrical channel two can be selected as a cylindrical cavity, a square cylindrical cavity, or a triangular cylindrical cavity.

Images