Silencer air duct elbow

Abstract

This utility model relates to the field of noise reduction technology for ventilation ducts, specifically a sound-absorbing duct elbow that solves the problems mentioned in the background art. It includes a main frame, with sound-absorbing modules installed on the inner wall of the main frame. Each sound-absorbing module includes a high-absorption module on the inner bend surface and a low-absorption module on the outer bend surface. The sound-absorbing modules are detachably installed within the main frame via a slide rail mechanism, and their edges are provided with elastic sealing strips. A supporting skeleton is provided on the inner wall of the main frame. The sound-absorbing module has a multi-layer composite structure, sequentially including a perforated plate, a cavity, and a sound-absorbing cotton layer. This utility model, by designing a sound-absorbing structure with differentiated perforation rates for the high and low absorption modules, combined with the modular installation method of the slide rail mechanism and elastic sealing strips, achieves precise control and convenient maintenance of the sound-absorbing performance of the duct elbow.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology for ventilation ducts, specifically a sound-absorbing duct elbow. Background Technology

[0002] In ventilation and air conditioning systems, duct elbows are key components for airflow deflection. However, due to the sudden change in airflow direction, turbulence and eddies are easily generated, resulting in significant aerodynamic noise. This noise not only affects the indoor acoustic environment but may also be transmitted to other areas through the ductwork, reducing the overall acoustic performance of the system.

[0003] Traditional silencing elbows typically employ a structure lined with sound-absorbing materials (such as glass wool or rock wool). However, due to the uneven airflow velocity distribution inside and outside the elbow, a single sound-absorbing design cannot be optimized for the noise characteristics of different areas, resulting in limited silencing effects. Furthermore, most existing silencing elbows use a fixed structure, making replacement difficult and maintenance costs high once the sound-absorbing material is damaged or its performance deteriorates. While some modular designs facilitate disassembly and assembly, they often suffer from insufficient sealing, low structural strength, or significant vibration transmission, affecting long-term performance. Utility Model Content

[0004] To solve the above problems, this utility model provides the following technical solution: a sound-absorbing duct elbow, including a main frame, a sound-absorbing module installed on the inner wall of the main frame, the sound-absorbing module including a high sound-absorbing module disposed on the inner bend surface and a low sound-absorbing module disposed on the outer bend surface, the sound-absorbing module being detachably installed in the main frame through a slide rail mechanism, and having an elastic sealing strip on its edge, the inner wall of the main frame being provided with a support skeleton, the sound-absorbing module being a multi-layer composite structure, comprising a perforated plate, a cavity and a sound-absorbing cotton layer in sequence.

[0005] Preferably, the slide rail mechanism includes a T-shaped slide rail disposed on the inner wall of the main frame and a matching slide groove disposed on the back of the sound-absorbing module.

[0006] Preferably, the perforation rate of the perforated plate is 15%-25% in the high sound absorption module area and 8%-12% in the low sound absorption module area.

[0007] Preferably, the support frame is made of aluminum alloy profile, and the support frame is connected to the inner wall of the main frame by bolts, and the contact surface is provided with a shock-absorbing rubber pad layer.

[0008] Preferably, the end of the noise reduction module is provided with a positioning boss that cooperates with the positioning groove on the inner wall of the main frame.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] By designing a sound-absorbing structure with differentiated perforation rates in high and low sound-absorbing modules, and combining it with a modular installation method using a sliding rail mechanism and elastic sealing strips, the sound-absorbing performance of the duct elbows can be precisely controlled and conveniently maintained. The multi-layer composite sound-absorbing modules, combined with the shock-absorbing design of the supporting frame, effectively reduce airflow noise and vibration transmission while ensuring structural strength. The combination of positioning bosses and T-shaped sliding rails ensures the sealing and stability of the module installation. Overall, it has the comprehensive advantages of high-efficiency sound absorption, durability and reliability, and disassembly and maintenance. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the overall side view structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the sound-absorbing module structure of this utility model;

[0015] Figure 4 This is a schematic diagram of the slide rail mechanism of this utility model.

[0016] In the diagram: 1. Main frame; 2. Noise-absorbing module; 21. High sound-absorbing module; 22. Low sound-absorbing module; 23. Perforated plate; 24. Cavity; 3. Slide rail mechanism; 31. T-shaped slide rail; 32. Slide groove; 4. Elastic sealing strip; 5. Support frame; 6. Positioning boss; 7. Positioning groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1-4As shown, the sound-absorbing duct elbow of this embodiment includes a main frame 1. A sound-absorbing module 2 is installed on the inner wall of the main frame 1. The sound-absorbing module 2 includes a high sound-absorbing module 21 disposed on the inner bend surface and a low sound-absorbing module 22 disposed on the outer bend surface. The sound-absorbing module 2 is detachably installed in the main frame 1 through a slide rail mechanism 3. An elastic sealing strip 4 is provided on its edge. A support frame 5 is provided on the inner wall of the main frame 1. The sound-absorbing module 2 is a multi-layer composite structure, which includes a perforated plate 23, a cavity 24 and a sound-absorbing cotton layer in sequence.

[0019] The slide rail mechanism 3 includes a T-shaped slide rail 31 located on the inner wall of the main frame 1 and a matching slide groove 32 located on the back of the noise reduction module 2, ensuring that the module will not derail when it slides.

[0020] The perforation rate of the perforated plate 23 is 15%-25% in the high sound absorption module 21 area and 8%-12% in the low sound absorption module 22 area, which increases the overall noise reduction.

[0021] The support frame 5 is made of aluminum alloy profile. The support frame 5 is connected to the inner wall of the main frame 1 by bolts, and the contact surface is provided with a shock-absorbing rubber pad layer. It reduces the weight by 35% compared to the steel frame, while the vibration transmission loss is increased to more than 15dB through the rubber pad. The natural frequency of the structure avoids the common excitation frequency of the air duct.

[0022] The end of the noise reduction module 2 is provided with a positioning boss 6, which cooperates with the positioning groove 7 on the inner wall of the main frame 1 to improve the ease of installation.

[0023] The working principle of this utility model is as follows:

[0024] When airflow passes through the bend of the silencer duct, due to the difference in airflow velocity between the inner and outer sides of the bend, the inner bend surface (high sound absorption module 21) uses a perforated plate 23 with a higher perforation rate (15%-25%) combined with a sound-absorbing cotton layer to effectively absorb high-frequency noise; the outer bend surface (low sound absorption module 22) uses a perforated plate 23 with a lower perforation rate (8%-12%) to optimize the attenuation of mid- and low-frequency noise. The slide rail mechanism 3 (T-shaped slide rail 31 and slide groove 32 cooperate) enables quick assembly and disassembly of the module, the elastic sealing strip 4 ensures airtightness, while the shock-absorbing rubber pad layer of the support frame 5 suppresses vibration transmission, and the cooperation between the positioning boss 6 and the positioning groove 7 ensures installation accuracy.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sound attenuating duct bend comprising a main frame (1), characterized in that The inner wall of the main frame (1) is equipped with a sound-absorbing module (2). The sound-absorbing module (2) includes a high sound-absorbing module (21) set on the inner curved surface and a low sound-absorbing module (22) set on the outer curved surface. The sound-absorbing module (2) is detachably installed in the main frame (1) through a slide rail mechanism (3). Its edge is provided with an elastic sealing strip (4). The inner wall of the main frame (1) is provided with a support frame (5). The sound-absorbing module (2) is a multi-layer composite structure, which includes a perforated plate (23), a cavity (24) and a sound-absorbing cotton layer in sequence.

2. A sound attenuating air duct elbow according to claim 1, wherein: The slide rail mechanism (3) includes a T-shaped slide rail (31) located on the inner wall of the main frame (1) and a matching slide groove (32) located on the back of the sound-absorbing module (2).

3. A sound attenuation air duct elbow according to claim 1, wherein: The perforated plate (23) has a perforation rate of 15%-25% in the high sound absorption module (21) region and a perforation rate of 8%-12% in the low sound absorption module (22) region.

4. A sound attenuation air duct elbow according to claim 1, wherein: The support frame (5) is made of aluminum alloy profile. The support frame (5) is connected to the inner wall of the main frame (1) by bolts, and the contact surface is provided with shock-absorbing rubber pads.

5. The acoustical duct elbow according to claim 1, wherein: The end of the silencing module (2) is provided with a positioning boss (6), which cooperates with the positioning groove (7) on the inner wall of the main frame (1).

Images