Noise reducing air duct

Abstract

The utility model discloses a kind of noise reduction ventilation ducts in the technical field of ventilation duct, including drainage inner tube, the outside of drainage inner tube is equipped with sound insulation outer tube, sound insulation outer tube includes first protective cover, the side of first protective cover is provided with second antiskid cover, second antiskid cover and the both sides of first protective cover are respectively equipped with fixed plate, the both ends of drainage inner tube are equipped with connecting flange, the both ends of drainage inner tube close to connecting flange are respectively provided with baffle, the scheme is installed sound-absorbing board in drainage inner tube inside middle part, and multiple groups of sound-absorbing cavities are formed between sound-absorbing board and drainage inner tube, and multiple groups of sound-absorbing holes are opened through,air flow can be guided to flow steadily and reduce air flow speed and energy, realize the source control to air flow noise, when air flow enters drainage inner tube, part of air flow will pass through sound-absorbing hole and enter sound-absorbing cavity, in cavity, back and forth reflection, collision, make air flow speed gradually reduce, energy is consumed constantly, to reduce the generation of noise.

Description

Technical Field

[0001] This utility model relates to the field of ventilation duct technology, and in particular to a noise reduction ventilation duct. Background Technology

[0002] Ventilation ducts are tubular channels used to transport air or other gases. They are a key component of ventilation systems and are widely used in construction, industry, transportation, and other fields. Their main function is to facilitate air circulation and exchange, thereby improving indoor air quality, regulating temperature and humidity, and removing harmful gases or smoke. Ventilation ducts are typically made of metallic materials (such as galvanized steel sheets and stainless steel) or non-metallic materials (such as fiberglass, composite materials, and PVC), and can be categorized according to their application, such as supply air ducts, exhaust air ducts, fresh air ducts, and smoke exhaust ducts.

[0003] In industrial production and daily life, ventilation ducts, as key components of ventilation systems, play a vital role in air transport and exchange. However, most existing ventilation ducts adopt a single-unit structural design. While these designs offer advantages such as good integrity, ease of processing and installation, and stable operation of the ventilation system, they still have significant shortcomings in noise reduction. When ventilation ducts encounter external friction or rapid airflow within the duct during operation, they easily generate considerable frictional and airflow noise. Due to the lack of targeted sound insulation, vibration reduction, and noise reduction structures, these noises cannot be effectively buffered or canceled, causing noise to accumulate continuously during ventilation system operation. The intermingling and superimposed friction and airflow noise severely affect the quiet atmosphere of the surrounding environment, not only interfering with people's normal work and rest but also potentially causing adverse effects on the hearing and physical and mental health of workers.

[0004] Therefore, improving the noise reduction performance of ventilation ducts has become a pressing technical problem in this field. Based on this, we propose a noise-reducing ventilation duct. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of the present invention, to avoid obscuring the purpose of these documents, and such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] Therefore, the purpose of this utility model is to provide a noise reduction ventilation duct that can solve the problem that existing ventilation ducts lack sound insulation, vibration reduction and noise reduction structures, resulting in the inability to effectively buffer and cancel external friction noise and internal airflow noise, thereby affecting the quietness of the environment and the physical and mental health of the staff.

[0007] To solve the above-mentioned technical problems, this utility model provides a noise reduction ventilation duct, which adopts the following technical solution: it includes an inner drainage pipe, and an outer sound insulation pipe is sleeved on the outside of the inner drainage pipe. The outer sound insulation pipe includes a first protective cover, a second anti-slip cover is provided on one side of the first protective cover, and fixing plates are respectively installed on both sides of the second anti-slip cover and the first protective cover. Both ends of the inner drainage pipe are equipped with connecting flanges, and retaining rings are respectively provided on both ends of the inner drainage pipe near the connecting flanges.

[0008] The second anti-slip cover has an embedded slot on one side near the two sets of fixing plates, and the first protective cover has an embedded plate on one side near the two sets of fixing plates. The inner middle of the first protective cover and the second anti-slip cover are also provided with sound-absorbing components.

[0009] Optionally, the embedded card slot is matched with the embedded card plate structure, and the embedded card slot and the embedded card plate are in a snap-fit ​​engagement.

[0010] Optionally, both the first protective cover and the second anti-slip cover have a mounting groove in the middle, and the mounting groove is provided with several sets of positioning strips. The first protective cover and the second anti-slip cover also have retaining grooves at both ends.

[0011] Optionally, the retaining groove and the retaining ring are matched, and the retaining groove and the retaining ring are in a transition fit.

[0012] Optionally, the sound-absorbing component includes a sound-absorbing washer, and the outer side of the sound-absorbing washer is provided with several sets of annular grooves. The annular grooves match the positioning strip structure, and the annular grooves and the positioning strip are engaged in a snap-fit ​​relationship.

[0013] Optionally, a sound-absorbing plate is installed in the middle of the inner side of the drainage inner tube, and multiple sets of sound-absorbing cavities are opened between the sound-absorbing plate and the drainage inner tube. Multiple sets of sound-absorbing holes are also opened through the sound-absorbing plate and the drainage inner tube.

[0014] In summary, this utility model has at least one of the following beneficial effects:

[0015] 1. The noise reduction ventilation duct designed in this scheme uses a sound-insulating outer pipe installed outside the inner duct. The outer pipe is secured by an embedded groove and a locking plate between the first protective cover and the second anti-slip cover. This design ensures that the sound-insulating outer pipe structure is not only stable but also has excellent sealing performance. This design effectively blocks various noise sources from the external environment from entering the duct, especially vibration noise generated by mechanical equipment and impact noise from the environment. At the same time, this structure can significantly suppress the structural resonance and vibration transmission of the duct itself under the action of airflow and equipment vibration, reducing noise radiation caused by duct vibration. This achieves effective isolation of external noise and buffering and weakening of duct structure vibration, comprehensively improving the noise reduction performance of the entire ventilation system and ensuring smoother and quieter duct operation.

[0016] 2. The noise reduction ventilation duct designed in this scheme forms a multi-layered noise attenuation system by installing sound-absorbing components inside the first protective cover and the second anti-slip cover, and setting a sound-absorbing plate inside the inner tube of the airflow. The sound-absorbing components use porous sound-absorbing materials, which can convert airflow noise into heat energy and dissipate it, effectively reducing noise energy. The combined use of the sound-absorbing plate, the sound-absorbing cavity, and the sound-absorbing holes causes the noise in the airflow to undergo multiple reflections, refractions, and interferences in the cavity, which greatly prolongs the propagation path of the sound waves and increases the chance of sound energy dissipation, thereby effectively weakening the propagation intensity of airflow noise. Through the above multi-layered and multi-mechanism synergistic noise reduction, the ventilation duct can significantly reduce the friction noise and airflow turbulence noise generated during operation, effectively creating a quieter working and living environment, avoiding the negative impact of noise on the hearing and mental health of the staff, and improving the overall comfort and safety of the environment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram showing the disassembled soundproof outer tube of this utility model;

[0020] Figure 3 This is a schematic diagram showing the disassembled drainage inner tube of this utility model;

[0021] Figure 4 This is a schematic diagram of the positioning strip structure of this utility model;

[0022] Figure 5This is a schematic diagram of the sound-absorbing component structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the sound-absorbing plate structure of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Inner drainage pipe; 2. Outer sound insulation pipe; 3. First protective cover; 4. Second anti-slip cover; 5. Fixing plate; 6. Connecting flange; 7. Retaining ring; 8. Embedded slot; 9. Embedded plate; 10. Sound-absorbing component; 11. Mounting groove; 12. Positioning strip; 13. Retaining groove; 14. Sound-absorbing gasket; 15. Annular groove; 16. Silencing plate; 17. Silencing cavity; 18. Silencing hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example: Refer to Figures 1 to 6 This utility model provides an embodiment of a noise reduction ventilation duct, including an inner drainage pipe 1, an outer sound-insulating pipe 2 sleeved around the inner drainage pipe 1, the outer sound-insulating pipe 2 including a first protective cover 3, a second anti-slip cover 4 provided on one side of the first protective cover 3, fixing plates 5 respectively installed on both sides of the second anti-slip cover 4 and the first protective cover 3, connecting flanges 6 installed at both ends of the inner drainage pipe 1, retaining rings 7 respectively provided at both ends of the inner drainage pipe 1 near the connecting flanges 6, embedded slots 8 opened on the side of the second anti-slip cover 4 near the two sets of fixing plates 5, and embedded plates 9 connected to the side of the first protective cover 3 near the two sets of fixing plates 5, with the inner middle of the first protective cover 3 and the second anti-slip cover 4... The ventilation duct is also equipped with sound-absorbing components 10. The noise reduction ventilation duct has a sound-absorbing plate 16 installed in the middle of the inner side of the inner tube 1, and multiple sets of sound-absorbing cavities 17 are formed between the sound-absorbing plate 16 and the inner tube 1. Multiple sets of sound-absorbing holes 18 are also opened through it. This can guide the airflow to flow smoothly and reduce the airflow speed and energy, thereby achieving source control of airflow noise. When the airflow enters the inner tube 1, some of the airflow will enter the sound-absorbing cavity 17 through the sound-absorbing hole 18. It will reflect and collide back and forth in the cavity, so that the airflow speed gradually decreases and the energy is continuously consumed, thereby reducing the generation of noise. In addition, the sound-absorbing plate 16 itself has a certain sound absorption performance and can reflect and absorb high-frequency noise in the airflow.

[0027] The embedded slot 8 and the embedded plate 9 are structurally matched, and the embedded slot 8 and the embedded plate 9 are interlocked. Through the interlocking structure design between the embedded slot 8 and the embedded plate 9, the first protective cover 3 and the second anti-slip cover 4 can be limited and fitted onto the outside of the inner drainage tube 1, while also improving the stability and sealing of the splicing assembly between the first protective cover 3 and the second anti-slip cover 4. The middle of the first protective cover 3 and the second anti-slip cover 4 are provided with mounting grooves 11, and several sets of positioning strips 12 are provided inside the mounting grooves 11. The two ends of the first protective cover 3 and the second anti-slip cover 4 are also provided with retaining grooves 13. The mounting groove 11 and positioning strip 12 provided on the inner side of the second anti-slip cover 4 are used for the disassembly and assembly connection between the first protective cover 3, the second anti-slip cover 4 and the sound-absorbing component 10. This enables the rapid installation and precise positioning of the sound-absorbing component 10, ensuring that the sound-absorbing component 10 fits tightly against the inner wall of the first protective cover 3 and the second anti-slip cover 4. The baffle groove 13 and the baffle ring 7 are structurally matched, and there is a transition fit between the baffle groove 13 and the baffle ring 7. Through the structural design of the transition fit between the baffle groove 13 and the baffle ring 7, a stable connection and precise positioning between the inner drainage pipe 1 and the outer sound insulation pipe 2 can be achieved, ensuring the overall sealing and stability of the pipeline and effectively preventing airflow leakage and noise escape.

[0028] The sound-absorbing component 10 includes a sound-absorbing washer 14. Several sets of annular grooves 15 are formed on the outer side of the sound-absorbing washer 14. The annular grooves 15 are structurally matched with the positioning strips 12, and the annular grooves 15 and the positioning strips 12 are engaged. Through this engaging structure, the sound-absorbing washer 14 can be securely installed on the positioning strips 12 inside the first protective cover 3 and the second anti-slip cover 4, ensuring the stability of the sound-absorbing component 10 and preventing displacement. This effectively absorbs noise inside the pipe and achieves efficient attenuation of airflow noise. The inner side of the inner tube 1 is equipped with a sound-absorbing plate 16. Multiple sets of sound-absorbing cavities 17 are opened between the sound-absorbing plate 16 and the inner tube 1. Multiple sets of sound-absorbing holes 18 are also opened through the sound-absorbing plate 16 and the inner tube 1. Through the coordinated use of the sound-absorbing plate 16, the sound-absorbing cavity 17 and the sound-absorbing hole 18, the inner tube 1 can effectively guide the airflow through the sound-absorbing hole 18 into the sound-absorbing cavity 17. When the airflow enters the sound-absorbing cavity 17, it will undergo multiple reflections and interferences, so that the sound wave energy is significantly attenuated and dissipated, ultimately reducing the propagation intensity of airflow noise.

[0029] Working Principle: The noise reduction ventilation duct designed in this scheme uses a sound-absorbing plate 16 installed in the middle of the inner side of the inner tube 1, forming multiple sets of sound-absorbing cavities 17 between the sound-absorbing plate 16 and the inner tube 1, and multiple sets of sound-absorbing holes 18 to guide the airflow smoothly and reduce the airflow speed and energy, thereby controlling the source of airflow noise. When installing the sound-absorbing plate 16, it is first placed in a predetermined position in the middle of the inner tube 1, ensuring that the sound-absorbing plate 16 is tightly fitted to the inner wall of the inner tube 1, while ensuring that the shape and size of the sound-absorbing cavity 17 meet the design requirements. When the airflow enters the inner tube 1, some of the airflow will enter the sound-absorbing cavity 17 through the sound-absorbing holes 18, reflecting and colliding back and forth in the cavity, gradually reducing the airflow speed and continuously consuming energy, thereby reducing the generation of noise. At the same time, the sound-absorbing plate 16 itself has a certain sound absorption performance, which can reflect and absorb high-frequency noise in the airflow, further achieving effective suppression and reduction of internal airflow noise.

[0030] The noise reduction ventilation duct designed in this scheme forms an integrated sound barrier by sleeved with a sound-insulating outer pipe 2 outside the inner drainage pipe 1, and then using the embedded slots 8 and embedded plates 9 to engage with the first protective cover 3 and the second protective cover 4. This achieves the blocking of external noise and the initial attenuation of internal noise. During installation, the inner drainage pipe 1 is first placed in the predetermined position, and then the first protective cover 3 and the second anti-slip cover 4 are placed on both sides of the inner drainage pipe 1, so that the embedded plates 9 are aligned with the embedded slots 8 and inserted until they are tightly engaged. At the same time, the sound-absorbing component 10 pre-installed in the middle of the inner side of the protective cover can absorb the noise generated when the airflow flows inside the duct. The sound-absorbing component 10 is usually made of porous sound-absorbing material. When sound waves enter the interior of the material, they cause the air and fibers in the pores to vibrate. Due to friction and viscous resistance, the sound wave energy is converted into heat energy and absorbed, achieving deep noise treatment and reducing the propagation and accumulation of noise.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A noise-reducing ventilation duct, comprising an inner drainage pipe (1), characterized in that: The drainage inner tube (1) is fitted with a soundproof outer tube (2). The soundproof outer tube (2) includes a first protective cover (3). A second anti-slip cover (4) is provided on one side of the first protective cover (3). Fixing plates (5) are installed on both sides of the second anti-slip cover (4) and the first protective cover (3). A connecting flange (6) is installed at both ends of the drainage inner tube (1). A retaining ring (7) is provided at both ends of the drainage inner tube (1) near the connecting flange (6). The second anti-slip cover (4) has an embedded slot (8) on one side near the two sets of fixing plates (5), and the first protective cover (3) has an embedded plate (9) on one side near the two sets of fixing plates (5). The inner middle of the first protective cover (3) and the second anti-slip cover (4) are also provided with sound-absorbing components (10).

2. The noise-reducing ventilation duct according to claim 1, characterized in that: The embedded slot (8) and the embedded card plate (9) are structurally matched, and the embedded slot (8) and the embedded card plate (9) are in a snap-fit ​​fit.

3. The noise-reducing ventilation duct according to claim 2, characterized in that: The first protective cover (3) and the second anti-slip cover (4) are provided with mounting grooves (11) in the middle. Several sets of positioning clips (12) are provided inside the mounting grooves (11). The first protective cover (3) and the second anti-slip cover (4) are also provided with baffles (13) at both ends.

4. The noise-reducing ventilation duct according to claim 3, characterized in that: The retaining groove (13) and the retaining ring (7) are structurally matched, and the retaining groove (13) and the retaining ring (7) are in a transition fit.

5. A noise-reducing ventilation duct according to claim 4, characterized in that: The sound-absorbing component (10) includes a sound-absorbing washer (14). Several sets of annular grooves (15) are provided on the outer side of the sound-absorbing washer (14). The annular grooves (15) are matched with the positioning strip (12) structure. The annular grooves (15) and the positioning strip (12) are engaged.

6. A noise-reducing ventilation duct according to claim 1, characterized in that: A sound-absorbing plate (16) is installed in the middle of the inner side of the drainage inner tube (1). Multiple sets of sound-absorbing cavities (17) are opened between the sound-absorbing plate (16) and the drainage inner tube (1). Multiple sets of sound-absorbing holes (18) are also opened through the sound-absorbing plate (16) and the drainage inner tube (1).

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