A double-layer resonant cavity sound barrier unit structure

Abstract

This application discloses a double-layer resonant cavity sound barrier unit structure, belonging to the field of noise control technology. The structure includes fixed ground piles, a main unit frame, an upper eaves, and limiting plates. The main frame is installed on the ground piles via connecting clips and contains a front resonant cavity and a rear resonant cavity: the front resonant cavity consists of a front hollow plate and an array of conical acoustic cavities, the conical cavities being a circular frustum structure with a larger outer surface and a smaller inner surface, used for mid-to-high frequency sound absorption; the rear resonant cavity consists of a rear hollow plate and a stepped acoustic cavity, the stepped cavity having a cross-section of a double-rectangular superimposed Helmholtz resonance structure. The frame is covered with centrifugal glass wool. The upper eaves contain dustproof cotton and hollow square steel support columns. The unit adopts standard modular dimensions and is quickly assembled using plug-in clips and sealing strips. Its advantages are: the double-layer resonant cavity, in conjunction with centrifugal glass wool, achieves full-band noise reduction; the moisture-proof and dustproof structure extends the service life to 10 years; and the modular design facilitates road construction and installation.

Description

Technical Field

[0001] This utility model relates to the field of noise control technology, specifically to a double-layer resonant cavity sound barrier unit structure. Background Technology

[0002] During current municipal construction, sound barriers need to be installed on both sides of the road to isolate road noise and reduce disturbance to nearby residential areas. Currently, traditional sound barriers mostly use a single-layer sound-absorbing structure, which has the following drawbacks:

[0003] Insufficient low-frequency absorption: Single-layer perforated plates or fiber materials are ineffective against engine and tire noise (125-250Hz);

[0004] Single frequency band: The resonant cavity design is only for a narrow frequency band;

[0005] Easily clogged: The performance of porous materials deteriorates after being exposed to moisture.

[0006] Based on the above problems, it is necessary to research a new type of sound barrier to optimize and solve these problems. Utility Model Content

[0007] This invention addresses the problems existing in the prior art by proposing a double-layer resonant cavity sound barrier unit structure. By combining a conical sound cavity (mid-to-high frequency) with a stepped sound cavity (low frequency) and filling it with centrifugal glass wool, noise reduction is achieved across the entire frequency range.

[0008] include:

[0009] Fixed ground piles are used to securely connect to the foundation on both sides of the road.

[0010] The unit's main frame is installed on top of a fixed ground pile via connecting buckles, and its interior contains a front resonant cavity and a rear resonant cavity.

[0011] The upper eaves are set at the top of the main frame of the unit and are equipped with dustproof cotton and fixed support columns inside;

[0012] The limiting plate is located on the outer bottom of the unit's main frame and is used for fixing and limiting.

[0013] Preferably, the front resonant cavity includes a front cavity plate with an array of conical acoustic cavities arranged on it. The conical acoustic cavities are circular frustum structures, with the opening area on the side closer to the road being larger than the inner area.

[0014] Preferably, the edge of the front cavity plate is provided with a dustproof clamp for fixing the centrifugal glass wool covering the outside. The centrifugal glass wool has a density of 32-48 kg / m³ and a thickness of 40-60 mm.

[0015] Preferably, the rear resonant cavity includes a rear cavity plate on which an array of stepped acoustic cavities are provided. The cross-section of the stepped acoustic cavities consists of two overlapping rectangles of the same area, forming a Helmholtz resonance structure.

[0016] Preferably, the depth of the stepped acoustic cavity is 150-200mm, and the volume of a single cavity is 20-30cm, which is used to absorb low-frequency noise of 100-500Hz.

[0017] Preferably, the outer side of the main frame of the unit is covered with centrifugal glass wool, and the centrifugal glass wool is covered with waterproof non-woven fabric.

[0018] Preferably, the upper eaves have an inclination angle of 15°-30°, are made of aluminum alloy, and have hollow square steel as the internal fixed support columns.

[0019] Preferably, the connecting buckle is a plug-in metal component, and adjacent units are sealed together by a rubber sealing strip.

[0020] Preferably, the thickness of the front cavity plate and the rear cavity plate is 1.5-2mm, and the material is galvanized steel plate or aluminum alloy.

[0021] Preferably, the standard dimensions of the main frame of the unit are 2m long × 1.5m high × 0.3m thick, and the whole is a detachable modular structure.

[0022] Compared with the prior art, this utility model provides a double-layer resonant cavity sound barrier unit structure, which has the following beneficial effects:

[0023] 1. The sound barrier unit is equipped with a front resonant cavity and a rear resonant cavity, which can enhance the noise reduction effect at different frequencies. Compared with traditional sound barrier units, the noise reduction coefficient (NRC) is ≥0.85, and the noise reduction at 125Hz low frequency is increased by more than 40%.

[0024] 2. The sound barrier unit is modularly designed, supports rapid installation, and has standardized unit dimensions (2m long × 1.5m high), which facilitates construction work.

[0025] 3. The sound barrier unit is equipped with a moisture-proof and dust-proof structure, which can extend its service life to more than 10 years during daily use. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 This is a three-dimensional structural diagram of a specific embodiment of the present utility model;

[0028] Figure 2 This is a side view of a specific embodiment of the present utility model.

[0029] Figure 3 This utility model Figure 2 A magnified view of a section at point A;

[0030] Figure 4 This is a schematic diagram of the component structure of the main frame of the unit in a specific embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the component structure of the front resonant cavity in a specific embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the component structure of the rear resonant cavity in a specific embodiment of this utility model.

[0033] In the diagram: 1. Fixed ground stake; 2. Connecting buckle; 3. Unit main frame; 4. Upper eaves; 5. Limiting plate; 101. Front resonant cavity; 102. Rear resonant cavity; 103. Dustproof clamp; 104. Centrifugal glass wool; 1001. Front cavity plate; 1002. Conical acoustic cavity; 2001. Rear cavity plate; 2002. Stepped acoustic cavity; 301. Dustproof cotton; 302. Fixed support column. Detailed Implementation

[0034] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0036] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0039] Example 1:

[0040] like Figure 1-6 As shown, the internal unit main frame 3 of the device includes a front resonant cavity 101 and a rear resonant cavity. The front resonant cavity 101 includes:

[0041] The front cavity plate 1001 is made of 1.8mm thick galvanized steel plate, and the opening diameter of the conical acoustic cavity 1002 gradually decreases from 8mm to 4mm from the outside to the inside, with a depth of 60mm.

[0042] Centrifugal glass wool 104 with a bulk density of 40 kg / m³ 3 Thickness 50mm, outer layer of polypropylene nonwoven fabric;

[0043] The dustproof clamps 103 are made of rubber and are arranged at 300mm intervals.

[0044] The interior of the rear resonant cavity 102 includes:

[0045] The stepped acoustic cavity 2002 has a depth of 180mm, individual cavity dimensions of 25mm×25mm×180mm, a volume of 22.5cm3, and a cavity spacing of 50mm.

[0046] The rear cavity plate 2001 is made of 2mm thick aluminum alloy with an anti-corrosion coating sprayed on the surface.

[0047] The overall frame dimensions are: 2m long × 1.5m high × 0.3m thick; the upper eaves are inclined at 25° and are made of 6063 aluminum alloy profiles.

[0048] The actual assembly process of this device is as follows:

[0049] 1. Pre-embed fixed piles along the elevated bridge guardrail at 2m intervals;

[0050] 2. The main frame 3 of the unit is vertically installed by connecting buckles 2, and rubber sealing strips 7 are embedded between adjacent units;

[0051] 3. Install the awning 4 on top and secure it with stainless steel bolts;

[0052] 4. The bottom is locked with a limiting plate 5 to ensure overall stability.

[0053] Furthermore, noise testing was conducted on the sound barrier panel, and the results are compared below:

[0054]

[0055] The data shows that the sound barrier panel used in this invention has a good noise reduction effect.

[0056] Example 2:

[0057] The Helmholtz resonator used inside this sound barrier panel differs from traditional Helmholtz resonators in the following ways:

[0058] 1. Double rectangular stepped structure:

[0059] Traditional Helmholtz resonators resonate through a single cavity and neck, while the stepped acoustic cavity 2002 couples two overlapping rectangles to form a dual resonant cavity.

[0060] The upper rectangular section has a resonant frequency of approximately 100Hz, corresponding to truck engine noise.

[0061] The lower rectangle has a resonant frequency of approximately 250Hz, corresponding to tire vibration noise.

[0062] The target frequency can be precisely tuned by adjusting the depth of the rectangle from 150 to 200 mm.

[0063] 2. Neckless design:

[0064] Traditional structures require separate machining of the neck, which has a diameter of 5-10mm and a length of 20-30mm, and is easily clogged by dust. This invention integrates the "neck" function required for resonance into the stepped gap, with an equivalent neck length equal to the step spacing of 10mm, thus avoiding the risk of clogging.

[0065] 3. Broadband absorption:

[0066] Traditional single-cavity acoustic chambers can only absorb a single frequency, such as 125Hz, while stepped acoustic cavity arrays cover the 100-500Hz frequency band through a combination of multiple sizes, such as 20mm and 30mm rectangular mixed arrangements.

[0067] In practical use, the maintenance cost of this Helmholtz resonator is reduced: traditional structures require regular cleaning of the neck dust, while this utility model's fully enclosed design requires no maintenance; at the same time, the noise reduction efficiency is improved: for the same volume, the low-frequency sound absorption is increased by more than 50%; and it is easy to install: modular units can be directly assembled without the need to adjust the resonator position separately.

[0068] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0069] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0070] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A double-deck resonant cavity sound barrier unit structure, characterized by, include: Fixed ground piles are used to securely connect to the foundation on both sides of the road. The unit's main frame is installed on top of a fixed ground pile via connecting buckles, and its interior contains a front resonant cavity and a rear resonant cavity. The upper eaves are set at the top of the main frame of the unit and are equipped with dustproof cotton and fixed support columns inside; The limiting plate is located on the outer bottom of the main frame of the unit and is used for fixing and limiting.

2. The sound barrier unit structure of claim 1, wherein: The front resonant cavity includes a front cavity plate with an array of conical acoustic cavities on it. The conical acoustic cavities are circular frustum structures, with the opening area on the side closer to the road being larger than the inner area.

3. The sound barrier unit structure of claim 2, wherein: The front cavity plate is provided with dustproof clips at its edge to fix the centrifugal glass wool covering the outside. The centrifugal glass wool has a density of 32-48 kg / m³ and a thickness of 40-60 mm.

4. The sound barrier unit structure of claim 2, wherein: The rear resonant cavity includes a rear cavity plate on which an array of stepped acoustic cavities are arranged. The cross-section of the stepped acoustic cavities consists of two overlapping rectangles of the same area, forming a Helmholtz resonance structure.

5. The sound barrier unit structure of claim 4, wherein: The stepped acoustic cavity has a depth of 150-200mm and a single cavity volume of 20-30cm, and is used to absorb low-frequency noise of 100-500Hz.

6. The sound barrier unit structure of claim 1, wherein: The outer side of the main frame of the unit is covered with centrifugal glass wool, and the centrifugal glass wool is covered with waterproof non-woven fabric.

7. The sound barrier unit structure of claim 1, wherein: The upper eaves have an inclination angle of 15°-30°, are made of aluminum alloy, and have hollow square steel internal fixed support columns.

8. The sound barrier unit structure of claim 1, wherein: The connecting buckle is a plug-in metal component, and adjacent units are sealed together by a rubber sealing strip.

9. The sound barrier unit structure of claim 4, wherein: The thickness of the front cavity plate and the rear cavity plate is 1.5-2mm, and the material is galvanized steel plate or aluminum alloy.

10. The sound barrier unit structure of claim 1, wherein: The standard dimensions of the main frame of the unit are 2m long × 1.5m high × 0.3m thick, and the whole is a detachable modular structure.

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