Ventilation system with noise silencer of underground structure

FIELD: mining.

SUBSTANCE: system includes pit shaft with air-sound channels, ventilation and noise silencer chambers and ventilation stall. Stall is attached to pit shaft by means of the pipeline piece built in the building located above the underground structure. Between ventilation and noise silencer chambers there installed is elastic diaphragm with an opening.

EFFECT: reducing noise level by means of multi-staged silencing.

1 dwg

 

The invention relates to the field of energy and can be used, for example, in the construction of ventilation systems with maximum sound attenuation functions for the metro.

In cases where an underground structure, such as a metro station with ventilation shaft, placed in dense and densely populated urban development, it demands in respect of noise from the powerful underground ventilation units with an indispensable save space support device pertaining to the system of ventilation and noise control.

Known ventilation system with maximum sound attenuation functions of the subway, including installed near city buildings support ventilation kiosk with an external annular fence, lined inside shumoglushiteli casing by a considerable thickness to suppress mainly low-frequency sound vibrations (EN 2286459 C1).

The main drawback of this system is that even very large thickness of the barrier with shumoglushiteli the lining does not provide safe health soundproofing. This is due to the extension part of the low-frequency sound vibrations through the fence in a horizontal direction to the lower floors of the surrounding buildings and virtually unimpeded spread up high frequency sound is output fluctuations, reaching the upper floors of nearby buildings. Other disadvantages of such a system, it should be noted the awkwardness of the whole structure, occupying a large area near buildings. In addition, such a construction is expensive and time consuming in construction.

Also known ventilation system with maximum sound attenuation functions of the subway, including a shaft with an air-to-conductive channels, underground ventilation and somapochtaru camera and placed over the mine shaft ventilation kiosk (Estuaries Y.A. "the Subways". - M: all-Union NP Union of Ministry of Railways, 1960. S). This system is the closest solution of the present invention to the technical essence and the achieved result.

The main disadvantage of the last of the above known systems is the lack of efficiency in relation to suppress underground noise to safe health level near the ventilation kiosk. This is because the low-frequency component of the acoustic oscillations, we feel as monotonous drone, almost can not be suppressed to the required safe values in only one shumoglushiteli the camera, and in the case of entering into resonance with the design of the ventilation kiosk on the and may even lead to destruction of its elements.

The objective of the proposed solution is the creation of a ventilation system with maximum sound attenuation functions underground structures, the construction of which is devoid of the above disadvantages of the known kiosks.

The problem is solved in that in the system of ventilation and noise underground structures, including a shaft with an air - to-conductive channels, ventilation and somapochtaru camera and placed over the mine shaft ventilation kiosk, the latter is connected with the shaft barrel by means of additional air - conductive channel with rigid walls, still embedded in located above the underground construction of the building, between the ventilation and shumoglushiteli cameras installed aperture with the aperture.

In the task received a new technical result.

This result is to increase the degree of sound attenuation underground structures due to multi-stage suppression as low-frequency and high-frequency acoustic oscillations of the noise spectrum.

The essence of the invention and its advantages compared with the known technical solutions will become more clear and apparent from the following description of a specific example of implementation with reference to the accompanying drawing.

On the line is e is a schematic representation of a view in vertical section of the proposed ventilation system with maximum sound attenuation functions underground structures.

In this example, the ventilation system with maximum sound attenuation functions underground structure includes a shaft 1 with air-conductive channels 2. Shaft shaft 1 reported executed in horizontal openings 3 Plenum 4 and shumoglushiteli camera 5. In the ventilation chamber 4 is mounted on the ventilation unit 6. In shumoglushiteli the camera 5 is placed the muffler 7 delovogo type, assembled from blocks of highly porous claydite-concrete. Shumoglushiteli camera 5 is located closer to the surface of the earth in relation to the ventilation chamber 4. Between the vent 4 and shumoglushiteli 5 cameras still installed elastic diaphragm 8 with the aperture 9. As shown in the drawing, the diaphragm 8 is placed directly in the ventilation chamber 4. The thickness of the diaphragm 8, its material and the diameter of the aperture 9 pick experimentally depending on the particular noise spectrum generated by the ventilation unit 6.

Above the underground structure (part of which is represented in the drawing) placed high-rise residential or office building 10, on the roof which was built ventilation kiosk 11. In this example, the ventilation kiosk 11 is installed coaxially with the output of channel 2 of the shaft 1.

Ventilation kiosk 11 communicated with the shaft barrel 1 by means of the PTO additional air-conductive channel 12 with rigid walls 13, made in the form of a segment of steel pipeline, still embedded in the building 10.

The functioning of the ventilation system with maximum sound attenuation functions underground structures made using the invention is as follows.

Work with powerful ventilation units underground structures (in this case, metro) accompanied by the generation of sound waves of different frequencies, which is manifested in the noise effect on the output of the shaft 1.

In the case of exhaust underground ventilation air flow from the Plenum 4 extends through the channels 2 of the shaft 1 and the additional channel 12. Next, the air flow through the louvered grille ventilation kiosk 11 enters the atmosphere above the roof of the building 1.

The low-frequency component of the sound waves emanating from the ventilation unit 6, first produces a phase mismatch effects with the same frequency on the diaphragm 8,partially losing their energy. Later in shumoglushiteli chamber 5 these low-frequency sound vibrations to meet the viscous resistance of the porous material of the muffler 7, where their energy is additionally spent on the transformation into heat energy. Finally the residual energy of these waves passing through the additional channel 12 communicates with gettimestring 13 last in contact with the massive building 10, almost completely losing his energy. As a result of this three-step process damping of low-frequency sound waves in the noise spectrum around the air kiosk 11 almost don't feel the underground unpleasant hum.

High frequency component of the sound waves from the powerful working of the ventilation unit 6 first weakened as a result of pressure difference at the inlet and outlet openings 9 of the diaphragm 8. Next, high-frequency sound vibrations almost completely lose their energy when passing through the numerous pores of the material of the muffler 7. As a result, the output of the ventilation kiosk barely felt a sound like whistling.

Thus, through the above-described structural features of the invention, sound waves effectively suppressed to the required level without exerting harmful effects on people around the ventilation shafts underground.

Other positive features of the invention, it should be noted compactness placement of support structures, which is of great importance in the field of construction in big cities.

The following claims are only the essential features that are necessary and sufficient for solving the table the task with a new technical result.

As can be seen from the above, the set of essential features of the present invention actually provides a solution to the problem, namely the creation of a new ventilation system with maximum sound attenuation functions underground structures, providing a highly efficient insulation harmful to human health noise by a three-stage damping of low-frequency sound with the simultaneous implementation of the two-stage damping of high-frequency sound.

Ventilation system with maximum sound attenuation functions underground structures, including a shaft with an air-to-conductive channels, ventilation and somapochtaru camera and placed over the mine shaft ventilation kiosk, characterized in that the ventilation kiosk is connected with the shaft barrel by means of additional air-conductive channel with rigid walls, still embedded in located above the underground construction of the building, between the ventilation and shumoglushiteli cameras installed aperture with the aperture.



 

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