CN1332096C - Double-face sound-absorbing contacting oral cavity sound shield without cotton - Google Patents

Abstract

The present invention relates to a double-face sound-absorbing sound shield having an engaged cavity without cotton in the technical field of noise control in environmental engineering. The present invention comprises two layers of aluminum fiber thin plates, two layers of cavities, two layers of micro-perforated plates, tooth-shaped cavities, a folding partition plate and a peripheral frame, wherein both sound absorbing surfaces on both sides of the sound shield are the aluminum fiber thin plates, and the two layers of cavities are arranged between the two layers of aluminum fiber thin plates and the two layers of micro-perforated plates. The tooth-shaped cavities are arranged between the micro-perforated plates and the folding partition plate, and the peripheral frame fixes the positions of the aluminum fiber thin plates, the micro-perforated plates and the folding partition plates. The tooth-shaped cavities formed by folding sound insulating plates are mutually engaged, so the present invention is a thin double-face sound absorbing and insulating shield which does not adopt non-metal fibrous materials, such as natural cotton, artificial cotton, glass cotton, sponges, rock cotton, mineral cotton, etc. in any position. The present invention is installed between upper and lower orbits on railway or urban railway traffic lines or between traffic lanes of multiple-lane roads for obviously reducing traffic noises.

Description

Double-sided sound-absorbing meshing cavity without cotton sound barrier

technical field

The invention relates to a sound barrier, in particular to a double-sided sound-absorbing cotton-free thin sound barrier, which belongs to the field of noise control in environmental engineering.

Background technique

The problem of noise control has been paid more and more attention by people. Environmental noise is directly related to people's quality of life, and even has an important impact on people's physical and mental health. Sound barriers are important facilities for noise control in rail transit, elevated roads and expressways. The current sound barriers are usually installed on one or both sides of roads or rail lines, and can be divided into two categories: sound-absorbing and sound-insulating. . Among them, the side of the sound-absorbing sound barrier facing the sound source has a higher sound absorption coefficient, while the side facing away from the sound source is usually not sound-absorbing; the two sides of the sound-insulating sound barrier are not sound-absorbing. In order to further reduce the noise of rail traffic and roads, it is sometimes necessary to install a relatively high sound barrier between the lines of railways (including urban rail transit) (such as between the upper and lower lines) or between the lanes of the road. Both face the noise source, therefore, a double-sided sound-absorbing sound barrier is required. Moreover, due to the limitation of installation space, the width of double-sided sound-absorbing sound barriers is often strictly limited. The design and production of the sound barrier must also meet the requirements of effect, life and environmental protection.

After searching the literature of the prior art, it is found that the name of the utility model is: micro-perforated sound-absorbing barrier board, patent application number: 03260902.7, publication number: 2627056, and the patent self-statement is: "The utility model relates to a micro-perforated sound-absorbing barrier The panel is composed of a panel, a back panel and a frame, the panel and the back panel are respectively fixed on the frame, and it is characterized in that: the panel thickness and perforation aperture are both below 1mm, and the perforation rate is 1-3%. The utility model sets the board thickness and perforation hole diameter of the panel below 1mm to form micro-perforations and reduce the perforation rate to 1-3%. Therefore, when the panel and the back panel form a resonance sound-absorbing In the structure, because the perforation is dense and thin, the sound resistance of the perforated plate is much larger than that of the prior art, and it can become a good sound-absorbing structure without adding any porous sound-absorbing materials, and the noise absorption effect is enhanced, and the absorption The frequency band of the noise is widened.". The sound barrier has the characteristics of not using natural or artificial cotton fibers, but because the sound barrier only uses a sound-absorbing structure composed of a layer of micro-perforated plates, the width of the sound-absorbing frequency band is relatively small, and it is difficult to meet the frequency requirements of traffic noise control . At the same time, this type of sound barrier has only one side for sound absorption, so it is not suitable for use between tracks and lanes with noise sources on both sides. If two pieces of this type of sound barrier are combined back to back into a double-sided sound-absorbing barrier, the total thickness will be one side. Double the sound barrier.

Contents of the invention

The object of the present invention is to aim at the deficiencies and defects of the prior art, to provide a double-sided sound-absorbing meshing cavity without cotton sound barrier, so that it can be installed between lines of railways (including urban rail transit) or between lanes of roads to meet the traffic noise control requirements.

The present invention is realized through the following technical solutions. The present invention includes: two layers of aluminum fiber sheets, two layers of cavities, two layers of micro-perforated plates, toothed cavities, folded partitions, and surrounding frames. The sound-absorbing surfaces on both sides of the sound barrier are made of aluminum fiber sheets. There are two layers of cavities between the two layers of aluminum fiber sheets and two layers of micro-perforated plates. There is a tooth-shaped cavity between the micro-perforated plates and the folded partition. The frame holds the positions of the aluminum fiber sheets, microperforated panels and folded partitions.

The sound-absorbing surfaces on both sides of the sound barrier, that is, the two outer surfaces of the sound barrier, are aluminum fiber sheets. The cavity between the aluminum fiber sheet and the micro-perforated plate constitutes the first group of sound-absorbing structures. The micro-perforated plate and the tooth-shaped cavity The cavity constitutes the second group of sound-absorbing structures. There is a set of tooth-shaped cavities on the back of the two layers of micro-perforated plates.

Adopting the engagement type cavity greatly reduces the thickness of the sound barrier, which is the technical gist of the present invention. The meshing cavity is composed of steel plates or other materials with good sound insulation performance folded or combined sound insulation panels, and the sound insulation panels also prevent the noise from one side of the sound barrier from passing through the sound barrier to the other side. Two groups of sound-absorbing structures on each side correspond to different frequencies of noise. The first set of sound-absorbing structures formed by the cavity between the aluminum fiber sheet and the micro-perforated plate is aimed at the high-frequency components of traffic noise, and the second set of sound-absorbing structures formed by the micro-perforated plate and the tooth-shaped cavity are effective against the middle and low frequencies of traffic noise. Components, tests show that the average sound absorption coefficient of the sound barrier in the three octave bands of the main frequency range of traffic noise from 250 to 2000 Hz is greater than 0.8, which can absorb 80% of the sound energy of traffic noise, thereby reducing the pollution of traffic noise to the surrounding environment . However, the "micro-perforated sound-absorbing barrier board" in the background technology adopts a single-layer micro-perforated structure, and the width of the sound-absorbing frequency band is usually only about two octaves.

The aluminum fiber sheets on the outer surfaces of both sides of the sound barrier can also be replaced by iron-nickel foam boards, foamed aluminum sheets and other metal fiber or foamed metal materials. Micro-perforated plates can also be replaced by aluminum fiber sheets, iron-nickel foam plates, foamed aluminum plates and other metal fiber or foamed metal materials.

The present invention has substantive features and significant progress, and no non-metallic fiber materials such as natural cotton, artificial cotton, glass wool, sponge, rock wool and mineral wool are used in any part of the sound barrier, so the sound barrier of the present invention has a long life The advantages of long life, renewable and environmental protection. The cavities on both sides of the sound barrier adopt intermeshing tooth structure, which greatly reduces the thickness of the sound barrier. The total thickness is less than 200mm, which broadens the sound absorption frequency band of the sound barrier. The average sound absorption coefficient of 250-2000Hz is greater than 0.8. The invention can be installed between the upper and lower tracks of railways or urban rail transit lines, or between the lanes of multi-lane roads, which can significantly reduce traffic noise.

Description of drawings

Fig. 1 cross-sectional structure schematic diagram of the present invention

Figure 2 is a schematic diagram of the front structure of the present invention

Fig. 3 top view of the present invention

Detailed ways

As shown in Figures 1 to 3, the present invention includes: two layers of aluminum fiber sheets 1, two layers of cavities 2, two layers of micro-perforated plates 3, toothed cavities 4, folded partitions 5, and surrounding frames 6. The sound-absorbing surfaces on both sides of the sound barrier are made of aluminum fiber sheets 1, and between the two layers of aluminum fiber sheets 1 and the two layers of micro-perforated plates 3 is a folded partition 5, between the two layers of micro-perforated plates 3 and the folded partition 5 Between them is a tooth-shaped cavity 4, and the surrounding frame 6 fixes the positions of the aluminum fiber sheet 1, the micro-perforated plate 3 and the folding partition 5.

The sound-absorbing surfaces on both sides of the sound barrier, that is, the two outer surfaces of the sound barrier, are all aluminum fiber sheets. The aluminum fiber sheet 1 and the cavity 2 constitute the first group of sound-absorbing structures, and the micro-perforated plate 3 and the tooth-shaped cavity 4 constitute In the second group of sound-absorbing structures, there is a set of tooth-shaped cavities 4 behind the two layers of micro-perforated plates 3, and the two sets of tooth-shaped cavities mesh with each other, so they are called meshing cavities.

Each sound-absorbing surface is composed of two sets of sound-absorbing structures, the sound-absorbing frequency band is wide, and the sound-absorbing coefficients of the two sound-absorbing surfaces are the same.

Claims (3)

1. A double-sided sound-absorbing meshed cavity without cotton sound barrier, including: two layers of aluminum fiber sheets (1), two layers of cavities (2), two layers of micro-perforated plates (3), and surrounding frames (6) , is characterized in that it also includes: a tooth-shaped cavity (4), a folded partition (5), the sound-absorbing surfaces on both sides of the sound barrier are aluminum fiber sheets (1), and two layers of aluminum fiber sheets (1) 1. Between the two layers of micro-perforated plates (3) are two layers of cavities (2), between the two layers of micro-perforated plates (3) is a folded partition (5), and between the two layers of micro-perforated plates (3) and the folded There are tooth-shaped cavities (4) between the partitions (5), and the surrounding frames (6) fix the positions of the aluminum fiber sheet (1), the micro-perforated plate (3) and the folded partition (5). 2. The double-sided sound-absorbing meshed cavity-free sound barrier according to claim 1, characterized in that the aluminum fiber sheet (1) and the cavity (2) constitute the first group of sound-absorbing structures, and the micro-perforated plate (3 ) and tooth-shaped cavities (4) constitute the second group of sound-absorbing structures. There is a set of tooth-shaped cavities (4) behind each of the two layers of micro-perforated plates (3), and the two sets of tooth-shaped cavities (4) mesh with each other. For engaging cavity. 3. The double-sided sound-absorbing meshed cavity-free sound barrier according to claim 1 or 2, characterized in that each sound-absorbing surface is composed of two sets of sound-absorbing structures, and the sound absorption coefficients of the two sound-absorbing surfaces are same.

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