CN218763948U - Noise reduction device for air duct - Google Patents

Abstract

The utility model aims at providing a can reduce the device of making an uproar falls in wind channel that the noise propagated along the wind channel. The utility model discloses a device of making an uproar falls in wind channel includes the device body that the inside was equipped with the air runner, and the key lies in, the lateral wall of air runner is equipped with the acoustic absorber, the acoustic absorber is equipped with the protruding portion that is outstanding to the axis direction of air runner, so in the air that flows through the air runner, at least part air leads to the route of advancing of this part air to have the bending section because of receiving the stopping of protruding portion; and the air flow channel is also internally provided with a sound absorption column, and the sound absorption column divides the air flow channel at the sound absorption column into at least two sub-flow channels. The utility model discloses a device of making an uproar falls in wind channel can install in central air conditioning, new trend system's wind channel department, with the noise absorption of its inside production, avoids the internal noise to leak all ring edge borders even through the wind channel propagation, causes harmful effects to all ring edge borders.

Description

Noise reduction device for air duct

Technical Field

The utility model belongs to the technical field of the acoustics, concretely relates to device of making an uproar falls in wind channel.

Background

In the working process of equipment such as central air conditioning, new trend system, parts such as its refrigerating unit, fan, water pump, cooling tower can produce certain noise, also can produce certain noise when the air current flows in the pipeline, and above-mentioned noise is propagated along the pipeline, and in order to avoid above-mentioned noise to cause the influence to the external world, people can wrap up one deck sound insulating material at the outer wall of pipeline. However, since air exchange (air intake or air discharge) with the outside is required at the end of the duct, it is necessary to maintain communication with the outside, and noise in the duct is emitted from the end of the duct, which adversely affects the surrounding environment.

Disclosure of Invention

The utility model aims at providing a can reduce the device of making an uproar falls in wind channel that the noise propagated along the wind channel.

The utility model discloses an air duct noise reduction device comprises a device body internally provided with an air flow channel, and is characterized in that the side wall of the air flow channel is provided with a sound absorption layer, and the sound absorption layer is provided with a protruding part protruding towards the axial line direction of the air flow channel, so that in the air flowing through the air flow channel, at least part of the air has a bent section due to the blockage of the protruding part, and the traveling route of the part of air has a bent section; and the air flow channel is also internally provided with a sound absorption column, and the sound absorption column divides the air flow channel at the sound absorption column into at least two sub-flow channels.

When the airflow flows through the air flow channel, part of the airflow collides with the protruding part of the sound absorption layer, and the noise carried by the part of the airflow is separated and absorbed by the protruding part, so that the overall noise output is reduced; the air flow in the air flow channel collides with the sound absorption column in the advancing process, the sound absorption column can absorb medium and low frequency sound waves and can positively cut off high frequency sound waves in the horizontal propagation direction; the air current changes direction under the water conservancy diversion effect of sound absorption post, has increased and has collided with the lateral wall acoustic absorber to by the chance of acoustic absorber absorbed noise, further improved the noise reduction effect.

Furthermore, the protruding parts of the sound absorption layer and the adjacent sound absorption columns are arranged in a staggered mode, so that the flowing direction of the airflow must be changed for many times when the airflow flows through the sound absorption layer and the sound absorption columns, the probability of collision between the airflow and the sound absorption layers and the sound absorption columns is increased, and the noise reduction effect is improved.

Furthermore, the protruding parts of the sound absorption layer are symmetrically arranged on the sound absorption layers on the two side walls opposite to the air flow channel, so that after the air flows through the two sides of the sound absorption column, the air flows collide and converge together at a certain angle behind the sound absorption column, the same-frequency sound waves carried by the two air flows are interfered with each other to be weakened, and the noise is greatly reduced.

Furthermore, the minimum distance between the protruding part of the sound absorption layer and the central axis of the air flow channel is larger than the maximum distance between the surface of the adjacent sound absorption column and the central axis of the air flow channel, so that a stream of air flow in the air flow channel cannot directly collide with the protruding part or the sound absorption column when flowing, the flow rate can be prevented from being greatly reduced, the flowing speed of the air flow in the air flow channel is ensured to meet the requirement, meanwhile, the stream of air flow can collide with other air flows with the original flowing direction changed in the flowing process, and the same-frequency sound waves carried by the two streams of air flow interfere with each other to weaken, thereby improving the noise reduction effect.

Furthermore, the cross section of the sound absorption column is in a shuttle shape, and the length direction of the cross section of the sound absorption column is parallel to the airflow flowing direction in the air flow channel. The wide both ends are narrow in the middle of the fusiformis cross-section, and the sound absorption post of this kind of cross-section not only is favorable to separating the air current, changes the direction of air current, reduces the resistance to the air current simultaneously, can also reduce the possibility that forms the vortex at the air current sound absorption post rear, reduces or avoids the vortex noise. Of course, the sound absorption column may have a bullet-shaped cross section, and the front end of the sound absorption column may reduce resistance to airflow.

Furthermore, the length of the sound absorption column in the air inlet direction of the air flow channel is smaller than the distance between the protruding parts of the two adjacent sound absorption layers on the same side wall, so that air flow is sequentially converged at the rear side of the sound absorption column along the air flow advancing direction under the action of the protruding parts of the sound absorption layers and the sound absorption column, and collision among air flows in different directions is enhanced.

Furthermore, the sound absorption layer is composed of a sound absorption plate and sound absorption cotton, sound absorption holes are distributed on the sound absorption plate, the sound absorption plate is fixedly connected with the side wall of the air flow channel, and the sound absorption cotton is clamped between the sound absorption plate and the side wall of the air flow channel.

Furthermore, the sound absorption column is a hollow columnar structure formed by enclosing sound absorption plates, sound absorption holes are distributed in the sound absorption plates, and sound absorption cotton is filled in the sound absorption column.

The sound absorption holes can enable part of sound waves to be drilled into the sound absorption layer, so that the sound absorption layer is absorbed by the sound absorption cotton inside the sound absorption layer. In order to absorb the reflected sound waves, the sound absorption holes are arranged on the protruding portion of the sound absorption layer and the windward side of the sound absorption column, and are also arranged on the protruding portion of the sound absorption layer and the leeward side of the sound absorption column.

The utility model discloses a device of making an uproar falls in wind channel can install in central air conditioning, new trend system's wind channel department, with the noise absorption of its inside production, avoids the internal noise to leak all ring edge borders even through the wind channel propagation, causes harmful effects to all ring edge borders.

Drawings

Fig. 1 is a schematic view of the overall structure of a noise reducing device of an air duct in embodiment 1.

Fig. 2 is a schematic diagram of the internal structure of the noise reduction device of the air duct in embodiment 1.

FIG. 3 is a cross-sectional view of an air duct noise reducer of embodiment 1.

FIG. 4 is an exploded view of the air duct noise reducer of embodiment 1.

Fig. 5 is a partial structural view of the sound-absorbing panel in embodiment 1.

The figures are numbered: 1. a device body; 2. an air inlet; 3. an air outlet; 4. an air flow passage; 5. hanging a lug; 6. a sound absorbing layer; 61. a protrusion; 7. an upper sidewall; 8. a lower sidewall; 9. a left side wall; 10. a right side wall; 11. a sound absorbing column; 12. a sound absorbing panel; 13. sound absorbing cotton; 14. a sound absorbing aperture; 15. a connecting plate.

Detailed Description

The following description of the embodiments of the present invention will be made in detail with reference to the accompanying drawings, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings, for example, the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, the functions and operation principles of the respective portions, and the like.

Example 1:

the embodiment provides an air duct noise reduction device capable of reducing noise along air duct propagation, which can be installed at the air duct of a central air conditioner and a fresh air system to absorb the noise generated inside the air duct, so that the internal noise is prevented from being propagated through the air duct and even leaking to the surrounding environment, and adverse effects on the surrounding environment are avoided.

As shown in fig. 1 to 5, the device for reducing noise in an air duct of this embodiment includes a device body 1 having a box-shaped structure, an air inlet 2 and an air outlet 3 are respectively disposed at two ends of the device body 1, an air flow passage 4 is disposed in the device body 1, two ends of the air flow passage 4 are respectively communicated with the air inlet 2 and the air outlet 3 of the device body 1, and a plurality of hangers 5 are disposed on an outer side of the device body 1, so as to fix the device body 1 to other components such as an air outlet of an air conditioner.

The side walls of the air flow channel 4 are provided with sound absorption layers 6, and the side walls comprise an upper side wall 7 (namely a top wall), a lower side wall 8 (namely a bottom wall), a left side wall 9 and a right side wall 10, wherein the sound absorption layers 6 of the upper side wall 7 and the lower side wall 8 are provided with protrusions 61 protruding towards the central axis direction of the air flow channel 4 at opposite positions, so that at least part of air flowing through the air flow channel 4 has a curved section due to the blockage of the protrusions 61; the protruding portion 61 is a wave-like curved surface, and the surface thereof is smoothly transited to reduce the resistance to the airflow. Of course, the protrusion 61 may also have other structures such as a column shape and a hemispherical shape, as long as it can change the flow direction of a part of the airflow to make the flow path of the airflow show this section, and details are not described here.

Two sound absorption columns 11 are further arranged in the middle of the air flow channel 4 at intervals, in this embodiment, two ends of each sound absorption column 11 are respectively and fixedly connected with the left side wall 9 and the right side wall 10 of the air flow channel 4, the protruding portions 61 of the sound absorption layer 6 are arranged in a staggered manner with the adjacent sound absorption columns 11, the cross sections of the sound absorption columns 11 are in a shuttle shape, and the length directions (i.e., the horizontal directions in fig. 3) of the cross sections of the sound absorption columns 11 are parallel to the airflow flowing direction in the air flow channel 4. The distance and the number of the sound absorption columns 11 can be adjusted according to the needs, and are not described herein.

For improving the intensity of air runner 4, go up lateral wall 7, lower lateral wall 8 still through connecting plate 15 connection, above-mentioned connecting plate 15 adopts the metal punching press to form, and both ends pass acoustic absorber 6 respectively and with last lateral wall 7, lower lateral wall 8 fixed connection, and connecting plate 15 is equipped with spacing through-hole in the position that corresponds sound-absorbing column 11 to supply sound-absorbing column 11 to pass, can play certain supporting role to sound-absorbing column 11 like this.

The sound absorption layer 6 is composed of a sound absorption plate 12 and sound absorption cotton 13, sound absorption holes 14 are distributed on the sound absorption plate 12, the sound absorption plate 12 is fixedly connected with the side wall of the air flow channel 4, and the sound absorption cotton 13 is clamped between the sound absorption plate 12 and the side wall of the air flow channel 4; the sound absorption column 11 is a hollow columnar structure surrounded by sound absorption plates 12, sound absorption holes 14 are distributed on the sound absorption plates 12, and sound absorption cotton 13 is filled in the sound absorption column 11. In this embodiment, the sound absorbing plate 12 is a metal plate, for example, an aluminum alloy plate, a steel plate, etc., sound absorbing holes 14 are formed on the metal plate by stamping, the sound absorbing holes 14 on the sound absorbing plate 12 are arranged in an array, the diameter of the sound absorbing hole 14 is 2.5mm, the center-to-center distance between adjacent sound absorbing holes 14 is 5mm, and the sound absorbing cotton 13 may be either glass fiber sound absorbing cotton or polyester fiber sound absorbing cotton.

The air flow enters the air flow passage 4 from the air inlet 2, passes through the air flow passage 4 and is discharged from the air outlet 3. When the air flow passes through the air flow passage 4, the upper air flow and the lower air flow collide with the protruding part 61 of the sound absorption layer 6, high-frequency noise carried by the part of the air flow is blocked by the protruding part 61, and medium-low frequency noise enters the protruding part 61 through the sound absorption holes 14 on the protruding part 61 and is absorbed by the sound absorption cotton 13 in the protruding part 61; the air flow in the middle of the air flow channel 4 collides with the sound absorption column 11, the high-frequency noise carried by the air flow is separated by the sound absorption column 11, and the low-frequency noise enters the sound absorption column 11 through the sound absorption holes 14 on the sound absorption column 11 and is absorbed by the sound absorption cotton 13 in the sound absorption column 11; the noise reduction effect of isolating high-frequency noise and absorbing middle and low-frequency noise is achieved through the protruding part 61 of the sound absorption layer 6 and the sound absorption column 11.

The sound absorption column 11 divides the air flow passage 4 at the sound absorption column 11 into two sub-flow passages, and after the middle air flow in the air flow passage 4 collides with the sound absorption column 11, under the guiding action of the sound absorption column 11, the traveling direction of the middle air flow is not parallel to the axial direction of the air flow passage 4 any more, but can generate certain deflection and face the upper side wall 7 and the lower side wall 8 so as to collide with the sound absorption layers 6 on the upper side wall 7 and the lower side wall 8; similarly, after the upper airflow and the lower airflow collide with the protruding portion 61, under the guiding action of the protruding portion 61, the traveling direction of the upper airflow and the lower airflow is no longer parallel to the axial direction of the air flow channel 4, but a certain deflection occurs, and the upper airflow and the lower airflow face the central axis of the air flow channel 4 and further collide with the rear sound-absorbing column 11, so that the chances of collision of the airflow with the sound-absorbing layer 6 and the sound-absorbing column 11 are increased, and the noise reduction effect is improved.

Moreover, in this embodiment, the length of the sound absorption column 11 in the air inlet direction of the air flow channel 4 is smaller than the distance between the protrusions 61 of two adjacent sound absorption layers on the same side wall, after the air flow passes through the two sides of the sound absorption column 11, the air flow collides and converges together at a certain angle at the back of the sound absorption column 11, the same-frequency sound waves carried by the two air flows interfere with each other to weaken, and the noise is greatly reduced.

In this embodiment, the minimum distance between the protruding portion 61 of the sound absorption layer 6 and the central axis of the air flow channel 4 is greater than the maximum distance between the surface of the adjacent sound absorption column 11 and the central axis of the air flow channel 4, so that it is ensured that an air flow in the air flow channel 4 does not directly collide with the protruding portion 61 or the sound absorption column 11 when flowing, thereby avoiding a great reduction in flow speed, ensuring that the flow speed of the air flow in the air flow channel 4 meets the requirement, and meanwhile, the air flow collides with other air flows having changed the original flow direction during the flowing process, and the same-frequency sound waves carried by the two air flows interfere with each other to weaken each other, thereby improving the noise reduction effect.

The present invention is described above with reference to the accompanying drawings, it is obvious that the specific design of the present invention is not limited by the above-mentioned manner, and the present invention is not limited by the above-mentioned manner, as long as the present invention adopts various insubstantial improvements made by the concepts and technical solutions of the present invention, or the present invention is directly applied to other occasions without improvement, and all of the present invention is within the protection scope of the present invention.

Claims (10)

1. A noise reduction device for an air duct comprises a device body with an air flow passage inside, and is characterized in that a sound absorption layer is arranged on the side wall of the air flow passage, and is provided with a protruding part protruding towards the central axis direction of the air flow passage, so that at least part of air in the air flowing through the air flow passage is blocked by the protruding part, and the traveling path of the part of air has a bent section; and the air flow channel is also internally provided with a sound absorption column, and the sound absorption column divides the air flow channel at the sound absorption column into at least two sub-flow channels.

2. The wind duct noise reduction device of claim 1, wherein the protrusions of the sound absorbing layer are staggered from adjacent sound absorbing pillars.

3. The wind duct noise reduction device of claim 2, wherein the protrusions of the sound absorption layer are symmetrically disposed at the sound absorption layer of the two opposite side walls of the air flow passage.

4. The duct noise reduction device of claim 3, wherein the cross-section of the acoustic strut is shuttle-shaped, and the length of the cross-section of the acoustic strut is parallel to the axial direction of the air flow channel.

5. The air duct noise reduction device according to claim 4, wherein the length of the sound absorption column in the axial direction of the air flow passage is smaller than the distance between the protrusions of two adjacent sound absorption layers on the same side wall.

6. An air duct noise reduction device according to claim 1, 2, 3, 4 or 5, wherein the minimum distance between the protrusion of the sound absorption layer and the central axis of the air flow channel is greater than the maximum distance between the surface of the adjacent sound absorption column and the central axis of the air flow channel.

7. The wind tunnel noise reduction device according to claim 6, wherein the sound absorption column is a hollow cylindrical structure surrounded by sound absorption plates, the sound absorption plates are provided with sound absorption holes, and sound absorption cotton is filled in the sound absorption column.

8. The wind channel noise reduction device according to claim 6, wherein the sound absorption layer is composed of a sound absorption plate and sound absorption cotton, the sound absorption plate is provided with sound absorption holes, the sound absorption plate is fixedly connected with the side wall of the air flow channel, and the sound absorption cotton is clamped between the sound absorption plate and the side wall of the air flow channel.

9. The wind channel noise reduction device according to claim 7, wherein the sound absorption layer is composed of a sound absorption plate and sound absorption cotton, the sound absorption plate is provided with sound absorption holes, the sound absorption plate is fixedly connected with the side wall of the air flow channel, and the sound absorption cotton is clamped between the sound absorption plate and the side wall of the air flow channel.

10. The duct noise reducing device of claim 3, wherein the acoustic post is bullet-shaped in cross-section.

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