Silencer of underground facility

FIELD: power industry.

SUBSTANCE: silencer includes head-frame ventilation stand with wall closed in transverse plane and provided with air-permeable openings, ceiling and roof, and external enclosure made in the form of an upward diverging funnel with sound reflecting inner surface and arranged with a gap relative to ventilation stand. Wall and ceiling of ventilation stand are made of high-porous noise-absorbing blocks. External enclosure is provided with the roof which has an annular through slot in transverse plane. At that, air openings made in the wall of ventilation stand are located in crossing rows between adjacent noise absorbing blocks.

EFFECT: reducing the noise level in vicinity of head-frame structures.

2 cl, 2 dwg

 

The invention relates to the field of energy and can be used for the installation of noise control systems of underground facilities in the places of the latter on the surface.

In cases where an underground structure, such as a metro station with ventilation shaft, placed in dense and densely populated urban development, it demands regarding noise from the powerful underground ventilation units.

Known to the sound of the underground facilities in the form of ventilation kiosk metro, including support structure with vozduhopropuskayuschy Windows, equipped with louvered grilles and external annular fence with vertical walls, lined inside soundproofing lining considerable thickness, not reaching the top of fences and walls designed for killing mostly low-frequency sound vibrations from working in underground construction powerful ventilation units (RU 2286459 C1).

The main disadvantage of such devices is that even a very large thickness of his fences with soundproofing lining does not guarantee safe for human health soundproofing. This is due to the extension part of the low-frequency sound vibrations through the fence in the horizontal such is the pressure down to the lower floors of the surrounding buildings and virtually unimpeded spread up high frequency sound vibrations.

Closest to the proposed muffler to the technical essence and the achieved result is a device that performs mainly a function of the noise underground structures and includes support ventilation kiosk closed in the transverse plane wall with vozduhopropuskayuschy window, ceiling and roof and external fence is made in the form of a funnel extending up from a sound-reflecting inner surface and placed with a gap relative to the ventilation kiosk. In this device a single number vozduhopropuskayuschy Windows made in the wall of solid material, is located at the same level over the entire height of the wall and each of the Windows taken louvered grill (EN 2368848 C1).

The disadvantage of such a muffler can be noted that high-frequency sound vibrations still reach the nearby buildings at a level above the funnel fencing. This is due to the absence of the device, means for filtering the separation of the noise spectrum and virtually unimpeded transmission up high-frequency acoustic waves emanating from underground structures.

Object of the present invention is to provide a highly efficient muffler underground structures, devoid of the disadvantages of the known devices such specifications, the Oia and providing new technical result.

The problem is solved in that the muffler underground structures, including support ventilation kiosk closed in the transverse plane wall with vozduhopropuskayuschy window, ceiling and roof and external fence is made in the form of a funnel extending up from a sound-reflecting inner surface and placed with a gap relative to the ventilation kiosk, wall and ceiling ventilation kiosk made of highly porous sound-absorbing blocks, and the outer enclosure is equipped with a roof, with vozduhopropuskayuschy window in the wall of the ventilation kiosk located in intersecting rows of noise between adjacent blocks, and the roof outer fences muffler is made with the ring in a transverse plane through the slot. In a possible embodiment of the device domed roof are made.

The technical result of solving the problem is to reduce the noise level to a safe for human health values in the surrounding support structures. This result is achieved by the supply of the sound attenuator means filtering the noise spectrum of acoustic oscillations and multiple changes of direction of propagation of high frequency acoustic waves.

The essence of the invention, and it is advantages compared with the known technical solutions will become more clear and apparent from the following description of a specific example with reference to the accompanying drawings.

1 schematically shows a view in vertical section of the muffler underground structures manufactured according to the present invention.

Figure 2 is a top view of the muffler of figure 1.

In this example embodiment of the invention the muffler underground structures installed on the ventilation shaft 1 through underground base 2 made of reinforced concrete.

The muffler contains fixedly mounted on the base 2 ventilation kiosk with 3 closed in the transverse plane of the wall 4, the ceiling 5 and the roof 6. 4 wall and ceiling 5 are made of a highly porous sound-absorbing blocks. The wall 4 has in this example a hexagonal shape. The sound-absorbing material of the blocks is highly porous claydite-concrete. Noise block wall 4 is folded so that between adjacent blocks left vozduhopropuskayuschy Windows 7, arranged in intersecting rows across the surface of the wall 4. Noise blocks ceiling 5 stacked without leaving air layers between adjacent blocks. Roof 6 ventilation kiosk 3 is executed in this example, of galvanized sheet iron.

On the basis also have an external enclosure 8 of glass "triplex", placed with a gap 9 for ventilation kiosk 3 and is provided with a domed ceiling 10 of whether the domestic iron. In the overlay 10 is made circular in transverse plane through slot 11.

The operation is made in accordance with the present invention muffler underground structures is as follows:

Work with powerful ventilation units underground structures is accompanied by the appearance of sound waves of different frequencies, manifested in noise effect at the outlet of the ventilation shaft 1. In the case of exhaust ventilation air flow from the ventilation shaft 1 passes through the grid vozduhopropuskayuschy Windows 7 into the gap 9 between the wall 4 ventilation kiosk 3 and the external enclosure 8 and is available through the annular slot 11 of the slab 10 to the atmosphere.

Together with the air flow are propagated sound waves.

When passing through the trellised wall 4 is filtered noise spectrum of the sound waves with the separation of high-frequency and low-frequency components. When this sound wave of high frequency partially extinguished by passing them through a labyrinth network of pores in the blocks of the wall 4 and the ceiling 5 of the ventilation kiosk 3. The main part of the high-frequency waves passes freely (separated) through the lattice with numerous vozduhopropuskayuschy Windows 7. Low-frequency sound waves largely extinguished by the sound-absorbing material of the components the wall 4 and the ceiling 5. The residual energy of low-frequency waves extinguished material outer fences 8 and the roof 6 of the ventilation kiosk 3. High-frequency sound waves when moving in the gap 9 between the outer fence 8 and ventilation kiosk 3 first recorded along the inner surface of the enclosure 8 to the top 10, where they again change direction and extend along the inner surface of the roof 10. When meeting with the external enclosure 8 and the roof 10 and passing through the annular slot 11 with the direction of the movement of high-frequency sound waves largely lose their energy in and out of the muffler that is safe for human health noise level.

As can be seen from the above, made in the form of a lattice of highly porous sound-absorbing wall blocks of a closed loop serves as a combined means for separating, filtering and damping of acoustic waves of different frequencies. The use of such means, characterized in the claims traits together with other structural features of the muffler, provides a significant reduction coming from underground construction noise to safe for people's health level.

1. The muffler underground structures, including support ventilation kiosk with a closed cross plosko and wall, having vozduhopropuskayuschy window, ceiling and roof and external fence is made in the form of a funnel extending up from a sound-reflecting inner surface and placed with a gap relative to the ventilation kiosk, characterized in that the wall and ceiling ventilation kiosk made of highly porous sound-absorbing blocks, and the outer enclosure is equipped with a roof, with vozduhopropuskayuschy window in the wall of the ventilation kiosk located in intersecting rows of noise between adjacent blocks, and the roof outer fences are made with circular in transverse plane through the slot.

2. The muffler according to claim 1, characterized in that the top of the outer fence is made dome.



 

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