CN204164042U - A kind of air exhausting soundproofing elbow for 35kV transformer chamber - Google Patents

Abstract

The utility model discloses an exhaust muffler elbow for a 35kV main transformer room, which is installed at the air outlet of a wall-type axial flow exhaust fan on the outer wall of the 35kV main transformer, including a casing and a A ventilation cavity, the ventilation cavity is respectively provided with an air inlet and an air outlet on the housing, the center line of the air inlet of the ventilation cavity coincides with the center line of the wall-type axial flow exhaust fan, and it also includes a The stainless steel wire mesh at the air outlet and the sound-absorbing sheet arranged at the center of the ventilation cavity and extending along its extension direction, the air-inlet end of the sound-absorbing sheet is provided with a conical flow guide, and the top of the conical flow guide A gap is provided between the plane where the air inlet is located, and the other end of the sound-absorbing sheet is flush with the plane where the air outlet is located. The overall noise reduction capacity of the exhaust noise reduction elbow of the utility model is higher, which can be increased by more than 3dB(A) compared with the prior art, and has a better noise reduction effect at the peak frequency of 35kV transformer noise.

Description

An Exhaust and Noise Reduction Elbow for 35kV Main Transformer Room

technical field

The utility model relates to the technical field of environmental engineering, in particular to an exhaust and noise-eliminating elbow for a 35kV main transformer room.

Background technique

With the development of the economy and the acceleration of urbanization, the power load in urban areas is increasing, and there are more and more substations in urban areas, especially 35kV substations that directly supply power to users are increasingly stationed in residential areas, Workspace. Due to the shortage of land in urban areas and the noise pollution of substations, most of the 35kV substations in urban areas are indoor substations, and the main transformer is installed in the 35kV main transformer room. For a 35kV indoor substation, although the main noise source in the substation—the noise of the main transformer has been basically isolated in the 35kV main transformer room, the noise of the main transformer will still affect the external environment through the air outlet of the main transformer room. , coupled with the fact that the noise of the main transformer has a significant narrow-band low-frequency characteristic, which presents peak sound pressure levels at 100Hz, 200Hz and 400Hz, making its low-frequency sound effects more obvious. In addition, the exhaust fan itself for ventilation and heat dissipation in the main transformer room will also generate noise, and its noise will also affect the external environment along with the exhaust air.

At present, most of the 35kV indoor substations in the urban area are close to residential buildings. The noise will inevitably affect the surrounding residents, and it is easy to cause environmental conflicts caused by the impact of noise transmission. It has become a major environmental pollution problem in the power grid system. The exhaust outlet of the 35kV main transformer room is treated with noise reduction.

An effective way to deal with noise reduction at the exhaust outlet is to install an exhaust noise reduction elbow on the exhaust outlet. At present, the noise-absorbing elbows used in the ventilation system are generally selected according to the national standard atlas "ZP type sheet muffler ZW type noise-absorbing elbow". The sound attenuation of the bent pipe is low at the peak frequency of transformer noise, and its overall sound attenuation is also not good. In addition, the exhaust fan of the indoor substation uses a wall-type axial flow fan. When installing the silencing elbow, it is directly placed on the air outlet of the exhaust fan, close to the exhaust fan, and the ZW type silencing elbow is only suitable for installation in ventilation In the pipeline system, it needs to be separated from the exhaust fan by a certain distance. To sum up, the ZW type muffler elbow is not suitable for the exhaust muffler of the 35kV main transformer room.

Contents of the invention

The purpose of this utility model is to provide a kind of exhaust noise-elimination elbow for 35kV main transformer room in order to solve the above-mentioned problems, which has better noise-elimination effect.

The purpose of this utility model is achieved in that:

The utility model relates to an exhaust muffler elbow for a 35kV main transformer room. The exhaust muffler elbow is installed at the air outlet of the wall-type axial flow exhaust fan on the outer wall of the 35kV main transformer. The wind muffler elbow includes a shell and a ventilation cavity arranged in the shell, and the ventilation cavity is respectively provided with an air inlet and an air outlet on the shell, and the centerline of the air inlet of the ventilation cavity is in line with the The center lines of the wall-type axial flow exhaust fan are coincident, and the exhaust muffler elbow also includes a stainless steel wire mesh arranged on the casing and at the air outlet and arranged at the center of the ventilation cavity and A sound-absorbing sheet extending along its extension direction, the air-inlet end of the sound-absorbing sheet is provided with a conical air guide, and a gap is provided between the top of the tapered air guide and the plane where the air inlet is located , the other end of the sound-absorbing sheet is flush with the plane where the air outlet is located.

The above-mentioned exhaust muffler elbow for a 35kV main transformer room, wherein the shell includes perforated galvanized steel plate/perforated aluminum plate, glass cloth, centrifugal glass wool plate and galvanized steel plate arranged sequentially from inside to outside , the centrifugal glass wool board is provided with a light steel keel.

The above-mentioned exhaust muffler elbow for a 35kV main transformer room, wherein the muffler sheet includes perforated galvanized steel plate/perforated aluminum plate, glass cloth, centrifugal glass wool board, glass cloth and perforated plated Zinc steel plate/perforated aluminum plate, light steel keel is arranged inside the centrifugal glass wool plate.

The above-mentioned exhaust muffler elbow for a 35kV main transformer room, wherein the hole spacing of the stainless steel wire mesh is 10mm×10mm.

Compared with the prior art, the utility model has higher overall noise reduction capacity, which can be increased by more than 3dB (A), and has better noise reduction effect at the peak frequency of 35kV transformer noise. During installation, the air inlet of the exhaust muffler elbow of the utility model can be directly set on the air outlet of the 35kV main transformer room wall type axial flow exhaust fan. It has the characteristics of compact structure, convenient installation and low manufacturing cost, especially suitable for 35kV main transformer room exhaust air muffler.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a schematic cross-sectional view of the shell in the utility model;

Fig. 3 is a schematic cross-sectional view of the noise damping sheet in the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Please refer to Fig. 1, which shows a kind of exhaust muffler elbow for 35kV main transformer room of the utility model, the exhaust muffler elbow is installed on the wall 6 on the outer wall 6 of the 35kV main transformer. At the air outlet of the blower fan 5, the exhaust muffler elbow of the utility model includes a casing 1 and a ventilation cavity 7 arranged in the casing 1, and the ventilation cavity 7 is respectively provided with an air inlet 71 and an air outlet 72 on the casing 1. , the centerline of the air inlet 71 of the ventilation cavity 7 coincides with the centerline of the wall-type axial flow exhaust fan 5, and the exhaust muffler elbow of the utility model also includes a stainless steel wire mesh arranged on the shell 1 and located at the air outlet 72 4 and the sound-absorbing sheet 2 arranged at the center of the ventilation cavity 7 and extending along its extension direction, the air-inlet end of the sound-absorbing sheet 2 is provided with a conical air guide 3, and the top of the tapered air guide 3 is connected to the There is a gap between the planes where the air inlet 71 is located, the other end of the sound-absorbing sheet 2 is flush with the plane where the air outlet 72 is located, and the hole spacing of the stainless steel wire mesh 4 is 10mm×10mm.

Please refer to Fig. 2, the shell 1 comprises the first perforated galvanized steel plate/perforated aluminum plate 15, the first glass cloth 14, the first centrifugal glass wool board 13 and the galvanized steel plate 11 arranged in sequence from the inside to the outside, the first centrifugal glass wool A first light steel keel 12 is arranged inside the board 13 .

Please refer to Fig. 3, the noise reduction sheet 2 includes the second perforated galvanized steel plate/perforated aluminum plate 21, the second glass cloth 23, the second centrifugal glass wool board 24, the second glass cloth 23 and the second perforated galvanized steel plate arranged in sequence / The perforated aluminum plate 21 and the second centrifugal glass wool plate 24 are provided with a second light steel keel 22 .

The exhaust and noise-eliminating elbow of the utility model is a 90° elbow, which is a resistive sheet-type noise-eliminating elbow. The silencing elbow has a better silencing effect at the peak frequency of 35kV transformer noise, and the overall silencing capacity is more than 3dB(A) higher than that of the ZW type silencing elbow. In addition, the muffler elbow is provided with a conical flow guide 3 at the end of the air inlet 71 to allow the air flow to enter the muffler elbow smoothly, and can be directly set on the air outlet of the wall-type axial flow exhaust fan 5 . To sum up, the exhaust and noise reduction elbow of the utility model is especially suitable for the exhaust and noise reduction of the 35kV main transformer room.

The above embodiments are only for illustrating the utility model, rather than limiting the utility model. Those skilled in the art can also make various transformations or modifications without departing from the spirit and scope of the utility model. Therefore, all equivalent technical solutions should also belong to the category of the present utility model, and should be defined by each claim.

Claims (4)

1. An exhaust and noise-eliminating elbow for a 35kV main transformer room, the exhaust and noise-eliminating elbow is installed at the air outlet of the wall-type axial flow exhaust fan on the outer wall of the 35kV main transformer, the exhaust and noise-eliminating The acoustic elbow includes a casing and a ventilation cavity arranged in the casing, and the ventilation cavity is respectively provided with an air inlet and an air outlet on the casing. It is characterized in that the center line of the ventilation cavity air inlet is in line with the The centerlines of the wall-type axial flow exhaust fans are coincident, and the exhaust muffler elbow also includes a stainless steel wire mesh arranged on the casing and at the air outlet and arranged at the center of the ventilation cavity. The sound-absorbing sheet extending along the direction of its extension, the air-inlet end of the sound-absorbing sheet is provided with a conical air guide, and a conical air guide is provided between the top of the tapered air guide and the plane where the air inlet is located. There is a gap, and the other end of the sound-absorbing sheet is flush with the plane where the air outlet is located. 2. An exhaust muffler elbow for 35kV main transformer room according to claim 1, characterized in that, the shell comprises perforated galvanized steel plate/perforated aluminum plate and glass cloth which are sequentially arranged from inside to outside , Centrifugal glass wool board and galvanized steel plate, the centrifugal glass wool board is provided with a light steel keel. 3. A kind of exhaust muffler elbow for 35kV main transformer room as claimed in claim 1, characterized in that, said muffler sheet comprises perforated galvanized steel plate/perforated aluminum plate, glass cloth, centrifugal Glass wool board, glass silk cloth and perforated galvanized steel plate/perforated aluminum board, the centrifugal glass wool board is provided with a light steel keel. 4 . The exhaust and muffler elbow for a 35kV main transformer room according to claim 1 , wherein the hole spacing of the stainless steel wire mesh is 10mm×10mm.