CN213904930U - Modular metal resonance silencing elbow - Google Patents

Abstract

The utility model belongs to the technical field of the warm silencer that leads to of building a modularization metal resonance noise elimination elbow, technical scheme is: a modular metal resonance silencing elbow comprises an outer shell and an inner wall, wherein a first sound absorption material is filled between the outer shell and the inner wall; and inserting a resonance layer into the first sound absorption material, wherein the resonance layer is a metal plate, and the insertion direction is along the longitudinal section direction of the sound attenuation elbow. The metal resonance layer is added in the existing silencing elbow, and the metal resonance layers with different resonance characteristics form the combination of various modules, so that the characteristics of low-frequency, medium-frequency and high-frequency continuous resonance silencing can be realized.

Description

Modular metal resonance silencing elbow

Technical Field

The utility model relates to a warm silencer technical field that leads to of building especially relates to a noise elimination elbow.

Background

With the increase of the requirements of human living environment, the relevant specifications put more and more strict requirements on indoor noise control, wherein the control of low-frequency noise is the most troublesome. The first choice is to use the muffling elbow to control the low-frequency noise. If there are not enough muffling bends, the low frequency noise can be controlled by natural attenuation by increasing the path of the ductwork. Or additionally adding a plurality of sections of mufflers or silencing static pressure boxes. The problem of these two alternatives is also obvious, the former affecting not only the building layout but also the space on the air duct path, which is disturbed by the noise radiation of the duct walls. The latter can occupy the building space and reduce the space utilization rate of the building. Therefore, the utilization rate of the building space can be improved due to better low-frequency noise elimination performance.

At present, the silencing elbow with better low-frequency noise control performance in the market mainly adopts XZW₅₀The double-arc silencing guide vanes are arranged in the silencing elbow or the thickness of a sound absorption material is increased, wherein the double-arc silencing guide vanes are recorded in selection and manufacture of the silencing elbow (national building standard design atlas 18K 116-4). The double-arc-shaped silencing flow deflector is in a crescent shape formed by intersecting two ends of two different arc-shaped galvanized steel plates, and the galvanized steel plates are filled with sound absorption materials. The crescent double-arc-shaped silencing guide vane penetrates through the silencing elbow, and two ends of the double-arc-shaped silencing guide vane are respectively limited at two ends of the silencing elbow. Although the double-arc silencing guide vane has a certain silencing function, the installation and construction of the double-arc silencing guide vane are complex and difficult, and the manufacture of the double-arc surface is also limited by the process. Increasing the thickness of the sound absorption material means that the thickness of the sound absorption elbow can be increased to 100mm by increasing the thickness of the inner cotton of the wall thickness at the periphery; the method can slightly improve the low-frequency noise elimination amount, but the low-frequency noise elimination performance can be improved along with the increasing thickness of the peripheral walls, and the medium-frequency noise elimination amount and the high-frequency noise elimination amount can be gradually reduced.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a modularization metal resonance noise elimination elbow, it is through increasing the metal resonance layer in current noise elimination elbow to constitute the combination between the various modules by the metal resonance layer through different resonance characteristics, can realize the characteristic of low frequency, the continuous resonance noise elimination of medium-high frequency.

The technical scheme of the utility model is that: a modular metal resonance silencing elbow comprises an outer shell and an inner wall, wherein a first sound absorption material is filled between the outer shell and the inner wall; and inserting a resonance layer into the first sound absorption material, wherein the resonance layer is a metal plate, and the insertion direction is along the longitudinal section direction of the sound attenuation elbow.

Based on the technical characteristics: a single-arc silencing flow deflector is arranged in the inner space of the silencing elbow, and comprises flow deflector outer walls with the same radian at two sides and a second sound absorption material clamped between the flow deflector outer walls; the outer wall of the flow deflector is a perforated galvanized steel plate; the resonance layer is inserted into the second sound-absorbing material, and the insertion direction is along the longitudinal section direction of the silencing elbow.

Based on the technical characteristics: the first sound absorption material and the second sound absorption material are made of the same material.

Based on the technical characteristics: the first sound absorbing material and the second sound absorbing material are spun glass wool.

Based on the technical characteristics: the resonance layer is a metal plate with the porosity of 0-20%, and the material is an aluminum plate or a galvanized steel plate. Among them, a non-perforated aluminum plate or a non-perforated galvanized steel plate having a porosity of 0% is most preferable.

Based on the technical characteristics: the thickness of the resonance layer is not more than 2 mm.

Based on the technical characteristics: the resonance layer is formed by combining a plurality of metal modules with different resonance characteristics; the metal plates with the same material, thickness and size are the same metal module.

Based on the technical characteristics: the metal module is a metal plate with the porosity of 0-20%, and the material is an aluminum plate or a galvanized steel plate. Among them, a non-perforated aluminum plate or a non-perforated galvanized steel plate having a porosity of 0% is most preferable.

Based on the technical characteristics: the thickness of the metal module is not more than 2 mm.

The utility model relates to a modularization metal resonance noise elimination elbow through carrying out the modularization split to the resonance layer, sets up the resonance module of different resonant frequency in the sound absorbing material between noise elimination water conservancy diversion piece and inner wall and shell respectively, reaches the effect of continuous resonance noise elimination. The sound absorption material in the silencing elbow can ensure the medium-high frequency noise reduction amount when noise passes through the elbow; the setting on resonance layer can promote the low frequency and fall the noise level to realize falling the promotion of the full frequency band of noise level.

The utility model has the advantages that: the metal resonance layer is added in the prior art, the resonance layer is further split in a modularized mode, the resonance frequency of the metal plates such as aluminum plates and galvanized steel plates which are combined in a multi-module mode can be flexibly adjusted, and full-band noise elimination is achieved. The metal plates such as the aluminum plate and the galvanized steel plate have the characteristics of fire resistance, durability, no toxicity, pressure resistance and the like, the structure of the resonance layer cannot be changed due to the arrangement of the resonance layer, and the thickness selectable range of the resonance layer material is favorable for processing and installation.

Drawings

Figure 1 is a longitudinal cross-sectional view of a prior art muffling elbow.

Fig. 2 is a longitudinal section of the modular metal resonance silencing elbow of the present invention.

Fig. 3 is a longitudinal section view of the modular metal resonance noise elimination elbow of the utility model provided with a single-arc noise elimination flow deflector.

Fig. 4 is a schematic diagram of the modularized application of the middle resonance layer of the present invention.

The reference numerals in the figures are meant to be:

a housing 1; a first sound-absorbing material 21; a second sound absorbing material 22; a resonance layer 3; an inner wall 4; the outer wall 5 of the flow deflector; a bayonet 6; a diversion limit plate 7; a ventilation duct 8.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, in the prior art, the muffling elbow comprises an outer shell 1 and an inner wall 4, and a first sound-absorbing material 21 is filled between the outer shell 1 and the inner wall 4. Generally, the structure form of the silencing elbow adopts the method of square outside and round inside, and has the advantages of simple structure, small resistance and the like. The two ends of the silencing elbow are respectively connected with the ventilating duct 8.

As shown in fig. 2, based on the prior art, the present invention inserts the resonance layer 3 into the first sound absorbing material 21, the resonance layer 3 is a metal plate, and the insertion direction is along the longitudinal section direction of the muffling elbow.

As shown in fig. 3, a single-arc silencing baffle can be further installed in the inner space of the silencing elbow through a flow guide limiting plate 7, and the flow guide limiting plates 7 are respectively located at two ends of the silencing elbow; the single-arc silencing guide vane comprises guide vane outer walls 5 with the same radian at two sides and a second sound absorption material 22 clamped between the guide vane outer walls 5; the outer wall 5 of the flow deflector is a perforated galvanized steel plate; the resonance layer 3 is inserted into the second sound-absorbing material 22 in the direction along the longitudinal section of the muffler elbow. The first sound absorbing material 21 and the second sound absorbing material 22 are preferably made of the same material. The diversion limit plate 7 belongs to the conventional technology.

In the embodiment, the inner wall 4 is made of the perforated galvanized steel plate which meets the fireproof standard requirement and has better corrosion resistance, and the thickness of 0.8mm can ensure that the product performance is stable and the product is durable; the requirement of not less than 18 percent of perforation rate can ensure the high-frequency silencing performance in the silencing elbow.

The single-arc-shaped silencing guide vane has good silencing performance, low process difficulty and convenient installation and construction. The second sound-absorbing material 22 inside the sound-absorbing baffle 5 can be made of centrifugal glass wool, and can be made of 32K centrifugal glass wool or 48K centrifugal glass wool generally; the sound-absorbing material has the advantages of stable sound-absorbing performance, uniform density, convenient construction and the like, and is fireproof, mildewproof and mothproof.

The resonance layer 3 is arranged in the first sound absorption material 21 and the second sound absorption material 22, the resonance layer 3 is a metal plate, an aluminum plate or a galvanized steel plate with the thickness not more than 2mm is preferably selected, the surface of the material can be selected to have low porosity or no porosity, experiments prove that the non-perforated aluminum plate or the non-perforated galvanized steel plate is preferably adopted, and the non-perforated metal plate has stronger sound attenuation performance. Through controlling the thickness and the size of the material, the resonance frequency can be selected, so that more resonance frequency points are ensured to fall in a region from 63Hz to 500Hz, finally, the resonance of noise and the noise is realized, and the sound energy is converted into mechanical energy to achieve the purpose of attenuating the sound energy; experiments prove that the resonance layer mainly comprising the aluminum and galvanized steel sheets can effectively increase the noise elimination amount of the full frequency, and the noise elimination performance within the range of 63Hz to 200Hz is particularly outstanding.

The housing 1 is preferably made of galvanized steel sheet with a thickness of 1mm to meet the strength, and a sound insulation of about 33dB can minimize the sound pressure level of the noise transmitted through the pipe.

As shown in fig. 4, is a schematic diagram of the modular application of the present invention. And metal plates with the same material, thickness and size are used as the same metal module. The same kind of metal modules have the same resonance characteristics. As shown in fig. 4, the metal module is divided into A, B, C and D. The resonance layer 3 can be composed of a plurality of metal modules with different resonance characteristics, and the metal modules can be connected through the bayonet 6. In this embodiment, the metal module a and the metal module B are combined together by the bayonet 6. The C metal module is a single whole block and is arranged in the single-arc silencing flow deflector. And the two D metal modules are inserted in a combined mode. The illustration in fig. 4 is only an illustration, and the resonance characteristics of the metal modules can be determined according to the actual situation of engineering, and the metal modules can be combined with each other. The metal module is a non-porous or low-porosity (porosity is 0-20%) resonance layer made of metal materials such as aluminum, galvanized steel sheets and the like, and the thickness of the resonance layer is not more than 2 mm.

The utility model discloses a theory of operation does: and a single-arc silencing guide vane is arranged in the space between the inner walls 4, and a second sound absorption material 22 in the single-arc silencing guide vane wraps the resonance layer 3. Between the inner wall 4 and the shell 1 is a first sound absorption material 21, and the resonance layer 3 is wrapped by the first sound absorption material 21. Through the arrangement and the modularization splitting of the resonance layer 3, modules with different resonance frequencies are respectively arranged between the single-arc silencing guide vane and the inner wall 4 as well as the shell 1, so that the continuity of low-frequency silencing can be ensured; in addition, the arrangement of the centrifugal glass wool in the first sound absorption material 21 and the second sound absorption material 22 can effectively ensure the absorption of medium-high frequency sound energy, thereby realizing the improvement of low-medium-high full-frequency band sound-deadening capacity.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (9)

1. A modular metal resonance sound-damping elbow comprises an outer shell (1) and an inner wall (4), wherein a first sound-absorbing material (21) is filled between the outer shell (1) and the inner wall (4); the method is characterized in that: and a resonance layer (3) is inserted into the first sound absorption material (21), the resonance layer (3) is a metal plate, and the insertion direction is along the longitudinal section direction of the sound attenuation elbow.

2. A modular metal resonant muffling elbow, according to claim 1, wherein: a single-arc silencing guide vane is arranged in the inner space of the silencing elbow, and comprises guide vane outer walls (5) with the same radian on two sides and a second sound absorption material (22) clamped between the guide vane outer walls (5); the outer wall (5) of the flow deflector is a perforated galvanized steel plate; the resonance layer (3) is inserted into the second sound-absorbing material (22), and the insertion direction is along the longitudinal section direction of the silencing elbow.

3. A modular metal resonant muffling elbow, according to claim 2, wherein: the first sound absorption material (21) and the second sound absorption material (22) are made of the same material.

4. A modular metal resonant muffling elbow of claim 3, wherein: the first sound-absorbing material (21) and the second sound-absorbing material (22) are spun glass wool.

5. A modular metal resonance muffler elbow, according to claim 1 or 2, characterized in that: the resonance layer (3) is a metal plate with the porosity of 0-20%, and is made of an aluminum plate or a galvanized steel plate.

6. A modular metal resonance muffler elbow, according to claim 5, wherein: the thickness of the resonance layer (3) is not more than 2 mm.

7. A modular metal resonance muffler elbow, according to claim 1 or 2, characterized in that: the resonance layer (3) is formed by combining a plurality of metal modules with different resonance characteristics; the metal plates with the same material, thickness and size are the same metal module.

8. The modular metal resonant muffling elbow of claim 7, wherein: the metal module is a metal plate with the porosity of 0-20%, and the metal module is made of an aluminum plate or a galvanized steel plate.

9. A modular metal resonance muffler elbow, according to claim 8, wherein: the thickness of the metal module is not more than 2 mm.

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