Silencing air duct for metro

Abstract

The utility model relates to the technical field of metro silencing, and discloses a metro silencing air duct which comprises an air duct body, an external sound insulation felt, a middle partition plate, internal sound absorption cotton and a grating cover plate. A channel allowing airflow to pass through is arranged in the air duct body, an inlet of the channel is communicated with an air return opening in the bottom of a compartment, and an outlet of the channel is communicated with the interior of the compartment. The middle partition plate is fixed in the air duct in the airflow direction; internal sound-absorbing cotton is arranged on the middle partition plates and air ducts between the middle partition plates; the grating cover plate is arranged at the outlet of the channel, and vent holes are formed in the grating cover plate; and an external sound insulation felt is coated outside the air duct main body. Noise is isolated and eliminated through the silencing air duct, noise in a passenger room of a subway train is reduced, the middle partition plate separates the air duct and is provided with the internal sound absorption cotton, the noise is effectively eliminated by means of the structural characteristics of the middle partition plate and the use of silencing materials, and therefore a good riding environment is provided.

Description

Technical Field

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

[0002] When subway trains are running, external noise is transmitted directly into the passenger compartment through the return air vents at the bottom of the carriage, causing disturbance to passengers. Currently, sound-absorbing ducts are generally installed inside the subway passenger compartment to isolate and eliminate noise, thereby optimizing the riding environment and improving passenger comfort. However, the sound-absorbing effect of current subway sound-absorbing ducts is not satisfactory, and it is necessary to provide a subway duct with better sound absorption to improve the riding environment. Utility Model Content

[0003] The purpose of this utility model is to provide a subway noise reduction duct with better noise reduction effect, and its specific technical solution is as follows:

[0004] A subway sound-absorbing duct includes a duct body, an external sound-insulating felt, a middle partition, an internal sound-absorbing cotton, and a grille cover.

[0005] The main body of the air duct is provided with a channel for airflow. The inlet of the channel is connected to the return air vent at the bottom of the carriage, and the outlet of the channel is connected to the interior of the carriage.

[0006] The intermediate partition is fixed inside the air duct along the airflow direction;

[0007] Multiple sets of intermediate partitions are arranged at intervals along the direction of the vertical air duct; internal sound-absorbing cotton is provided on the intermediate partitions and on the air ducts located between two adjacent intermediate partitions.

[0008] The grating cover is installed at the exit of the channel, and the grating cover is provided with ventilation holes;

[0009] The main body of the air duct is covered with an external sound insulation felt.

[0010] Preferably, the ventilation holes of the grille cover are elongated.

[0011] Preferably, multiple elongated ventilation holes are arranged in a group on the grille cover plate and located between the partitions.

[0012] Preferably, the substrate of the external sound insulation felt has a density in the range of 0.05 g / cm³. 3 ~0.15g / cm 3 Polymers.

[0013] Preferably, the external sound insulation felt is provided with an adhesive layer, which is used to adhere the external sound insulation felt to the air duct body.

[0014] Preferably, the intermediate partition is connected to the air duct body by a riveting process.

[0015] Preferably, the grille cover is connected to the air duct body by an adhesive bonding process.

[0016] Preferably, the internal sound-absorbing cotton has a density in the range of 0.05 g / cm³. 3 ~0.15g / cm 3 of.

[0017] The application of the technical solution of this utility model has the following beneficial effects:

[0018] A subway sound-absorbing duct includes a duct body, an external sound-insulating felt, a middle partition, internal sound-absorbing cotton, and a grille cover. The duct body has an internal channel for airflow; the inlet of the channel connects to the return air vent at the bottom of the carriage, and the outlet connects to the interior of the carriage. The middle partition is fixed within the duct along the airflow direction. Internal sound-absorbing cotton is installed on the middle partition and on the duct between the middle partitions. The grille cover is located at the outlet of the channel and has ventilation holes. The duct body is externally covered with an external sound-insulating felt. This sound-absorbing duct provides noise isolation and elimination, reducing noise inside subway train passenger compartments. By separating the duct with the middle partition and installing internal sound-absorbing cotton, the duct's structural characteristics, combined with the use of sound-absorbing materials, effectively eliminate noise, thus providing a comfortable riding environment.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a subway noise reduction duct according to an embodiment of the present utility model.

[0022] In the diagram: 1. Main body of the air duct; 2. External sound insulation felt; 3. Middle partition; 4. Internal sound-absorbing cotton; 5. Grille cover. Detailed Implementation

[0023] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0024] refer to Figure 1A subway sound-absorbing duct includes a duct body 1, an external sound-insulating felt 2, a middle partition 3, an internal sound-absorbing cotton 4, and a grille cover 5. The duct body 1 has a channel for airflow, the entrance of which is connected to the return air vent at the bottom of the carriage, and the exit of which is connected to the interior of the carriage. The middle partition 3 is fixed inside the duct along the airflow direction. The internal sound-absorbing cotton 4 is provided on the middle partition 3 and on the duct between the middle partitions 3. The grille cover 5 is located at the exit of the channel and has ventilation holes. The duct body 1 is covered with an external sound-insulating felt 2.

[0025] The main body of the air duct is integrally molded from a composite material that provides sound insulation, noise reduction, fire resistance, and moisture resistance.

[0026] The intermediate partition 3 is arranged in multiple groups at intervals along the direction of the vertical air duct. The ventilation holes of the grille cover 5 are elongated. Multiple elongated ventilation holes are arranged in groups on the grille cover 5 and located between the partitions.

[0027] An adhesive layer is provided on the external sound insulation felt 2, which is used to adhere the external sound insulation felt 2 to the air duct body 1. The base material of the external sound insulation felt 2 has a density range of 0.05 g / cm³. 3 ~0.15g / cm 3 The polymer is environmentally friendly and durable, and can efficiently absorb medium and high frequency sound waves. The external sound insulation felt itself is adhesive on one side, making it easy to install.

[0028] The intermediate partition 3 is connected to the air duct body 1 by riveting, and at the same time provides a carrier for the bonding and fastening of the internal sound-absorbing cotton.

[0029] The grille cover 5 is connected to the air duct body 1 by an adhesive bonding process. The grille structure on the cover serves as the return air function in the train passenger compartment.

[0030] The internal sound-absorbing cotton 4 has a density range of 0.05 g / cm³. 3 ~0.15g / cm 3 The fiber material has a porous internal structure that allows sound to recirculate within its cavity, resulting in high sound absorption efficiency and a noticeable effect.

[0031] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sound-absorbing ventilation duct for subways, characterized in that, It includes the main body of the air duct (1), the external sound insulation felt (2), the middle partition (3), the internal sound-absorbing cotton (4), and the grille cover (5); The air duct body (1) is provided with a channel for airflow to pass through. The inlet of the channel is connected to the return air vent at the bottom of the carriage, and the outlet of the channel is connected to the interior of the carriage. The intermediate partition (3) is fixed in the air duct along the airflow direction; Multiple sets of intermediate partitions (3) are arranged at intervals along the direction of the vertical air duct; internal sound-absorbing cotton (4) is provided on the intermediate partitions (3) and on the air duct between two adjacent intermediate partitions (3); The grating cover (5) is located at the exit of the channel, and the grating cover (5) is provided with ventilation holes; The exterior of the air duct body (1) is covered with an external sound insulation felt (2).

2. The subway sound-absorbing ventilation duct according to claim 1, characterized in that, The ventilation holes of the grille cover (5) are elongated.

3. The subway sound-absorbing ventilation duct according to claim 2, characterized in that, Multiple elongated ventilation holes are arranged in a group on the grille cover plate (5) and located between the partitions.

4. The subway sound-absorbing ventilation duct according to claim 1, characterized in that, The base material of the external sound insulation felt (2) has a density range of 0.05 g / cm³. 3 ~0.15g / cm 3 Polymers.

5. A subway sound-absorbing ventilation duct according to claim 1, characterized in that, The external sound insulation felt (2) is provided with an adhesive layer, which is used to adhere the external sound insulation felt (2) to the air duct body (1).

6. The subway sound-absorbing ventilation duct according to claim 1, characterized in that, The intermediate partition (3) is connected to the air duct body (1) by riveting.

7. A subway sound-absorbing ventilation duct according to claim 1, characterized in that, The grille cover (5) is connected to the air duct body (1) by an adhesive bonding process.

8. A subway sound-absorbing ventilation duct according to claim 1, characterized in that, The internal sound-absorbing cotton (4) has a density range of 0.05 g / cm³. 3 ~0.15g / cm 3 Fiber materials.

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