CN201883721U - Sound absorption structure for transformer substation - Google Patents

Abstract

The utility model discloses a sound-absorbing structure for a substation, which is characterized in that: the base surface is connected with a protective panel through a light steel keel, an air layer is formed between the base surface and the protective panel, and an air layer is formed between the base surface and the protective panel. The inner surface of the protective panel is equipped with sound-absorbing non-woven fabric. The main features of the product are as follows: ⅰ. The sound-absorbing structure has a high sound absorption coefficient in the peak frequency band of electromagnetic noise in the substation; ⅱ. No heat storage, no glass fiber, etc. Fibrous sound-absorbing material with good heat insulation and heat storage performance; ⅳ. If the protective panel adopts perforated insulating board, it can be installed in places with insulation requirements; ⅳ. The fire rating of sound-absorbing non-woven fabric is A2-S1, do , to grade, and others are non-combustible materials, which meet the fire safety requirements in substations; ⅴ, convenient installation, can meet the tight construction schedule of domestic substations; the installation of sound-absorbing structures is convenient; ⅵ, the thickness of sound-absorbing structures generally does not exceed 150mm, Meet the compact arrangement of equipment in the substation.

Description

A sound-absorbing structure used in substations

technical field

The utility model relates to the technical field of sound-absorbing and sound-insulating systems for substations, in particular to a composite sound-absorbing structure for substations, in particular to its mechanical connection structure.

Background technique

The application of noise control technology in the design, construction and renovation of urban substations has been valued year by year in the new century, because of the rapid increase in urban electricity consumption and the increase in the density of electricity loads in urban centers, 110-220kV and even 500kV substations have entered the center urban area. Due to the shortage of land in the central urban area, residential buildings are often adjacent to urban substations, including some old substations. Residential buildings are often built around some old substations. Although substations can be designed as indoor or underground substations, the impact of noise transmission from substations still easily leads to environmental conflicts. Therefore, it is necessary to take necessary noise control to solve or avoid these environmental contradictions, so that there is a direct need for noise control technology and products (including sound-absorbing treatment technology and sound-absorbing products) in substations.

Since safety and reliability are the first elements of substations, traditional technical management has great constraints on noise and vibration control, especially for ultra-high voltage substations of 220kV and above, the requirements for technical measures for noise and vibration control are more stringent. The development of Shanghai's urban power grid and the construction of urban substations are at the forefront of the country, and the noise and vibration control technology of substations should also be at the forefront of the country, requiring special technologies and products for substation noise and vibration control.

The noise control of the substation includes the selection of low-noise transformers and auxiliary equipment, the installation of sound-absorbing structures in the transformer room to reduce reverberation noise, the use of sound-insulating doors and windows, and the reduction of the intensity of noise propagation; The transmission of dynamic noise and other engineering measures, but the installation of sound-absorbing structures in the transformer room is the most important and basic technical measure, which can reduce the reverberation noise in the room, the total noise level and the intensity of noise transmission to the outside.

Analysis of the main technical characteristics that the sound-absorbing structure of the substation transformer room should have:

The electromagnetic noise generated by the transformer during operation is a low-frequency noise, and the frequency is relatively concentrated. Through multiple noise tests, we have mastered the frequency characteristics of the electromagnetic noise of power transformers. The main frequency range is 100-315Hz, and the peak frequencies are 100Hz, 200Hz, and 300Hz, corresponding to transformer fundamental frequency noise, secondary high frequency noise, and tertiary high frequency noise. ; When the frequency is higher than 315Hz, the noise level decreases approximately linearly.

The electromagnetic noise generated by the transformer belongs to low-frequency noise, and the frequency is concentrated in 100-315Hz. Low-frequency noise, especially low-frequency noise with concentrated frequency, can easily cause people's reactions, make people easy to fatigue and worry, and have a potential impact on people's physical and mental health. From the technical point of view of noise control, the lower the frequency of noise, the more difficult it is to take noise control measures. The reason is that low-frequency noise has a long wavelength and a low distance attenuation rate, and it is not easy to be absorbed, isolated and eliminated. Therefore, the sound absorption, sound insulation and noise reduction measures of low-frequency noise have certain particularities and technical difficulties.

The sound-absorbing structure installed in the transformer room must be aimed at the low-frequency characteristics of transformer electromagnetic noise. The sound-absorbing structure must have a high sound-absorbing coefficient in the main frequency range of 100-315Hz in order to achieve a more obvious noise reduction effect. This is the sound-absorbing structure. The most important acoustic properties.

The power transformer consumes a certain amount of power during the process of input and output current, and the consumed power is converted into heat. The shell of the transformer radiates and emits a large amount of heat. In order to make the transformer operate normally, although the power transformer adopts an oil cooling system The transformer room is designed with louvers or exhaust fans for ventilation and heat dissipation. In summer, the temperature in the transformer room of most substations in the urban area of Shanghai is still very high, so the temperature control in the transformer room is a very important issue.

In the beginning, we used the sound-absorbing structure of conventional "centrifugal glass wool board" + protective panel in the noise control of several small substations. Although a good noise reduction effect was achieved, the temperature of the transformer room rose significantly. In summer, it is necessary to open the door or take other exhaust measures. For this reason, the management department of the substation raised doubts, requiring that the sound-absorbing structure installed on the walls around the transformer room should not have the function of heat storage and heat insulation, so that It forces us to look for and even develop a new high-efficiency sound-absorbing structure that does not store heat.

Of course, there are very strict fire protection and safety requirements in the transformer room of the substation, especially for ultra-high voltage substations of 220kV and above, the requirements are even more stringent. These requirements are actually restrictions on other aspects of the sound-absorbing structure, including sound-absorbing The space occupied by the structure cannot affect the safe operation of the transformer.

Contents of the invention

The purpose of this utility model is to provide a sound-absorbing structure for a substation, which is most suitable for the sound-absorbing treatment project of the main transformer room of the substation (that is, the room where the power transformer of the substation is installed), and can be used for the decorative structure of the substation control room. Sound absorption treatment can also be used for indoor sound absorption treatment of other buildings. The average sound absorption coefficient of this sound absorption structure can reach 0.8, and the noise reduction coefficient can exceed 0.75. It has the best absorption in the electromagnetic noise frequency range of power transformers. The sound coefficient overcomes the shortcomings and deficiencies in the prior art.

In order to achieve the above object, the technical solution of the present invention is: a sound-absorbing structure for a substation, which mainly includes a base surface, which is characterized in that: the base surface is connected to the protective panel through a light steel keel, and the base surface and the protective panel An air layer is formed between the panels, and the inner surface of the protective panel between the base surface and the protective panel is provided with sound-absorbing non-woven fabric.

The utility model discloses a sound-absorbing structure used in substations. The main features of the product are as follows: 1. The sound-absorbing structure has a relatively high sound-absorbing coefficient in the peak frequency band of electromagnetic noise in the substation; 2. No heat storage and no glass Fibrous sound-absorbing materials with good heat insulation and heat storage performance such as fiber; ⅳ. If the protective panel adopts perforated insulating board, it can be installed in places with insulation requirements; ⅳ. The fire rating of sound-absorbing non-woven fabric is A2-S1 , do, to grade, and others are non-combustible materials, which meet the fire safety requirements in substations; ⅴ, easy to install, can meet the tight construction requirements of domestic substation construction, and the installation of sound-absorbing structures is convenient; 150mm, which meets the compact arrangement of equipment in the substation; ⅶ, economy, basically using domestic materials, compared with foreign products, it has obvious economy. The product has good practicability, and compared with existing products, it has outstanding substantive features and significant progress.

Description of drawings

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

Fig. 2 is a structural schematic diagram of the protective panel of the present invention.

Detailed ways

Below with reference to accompanying drawing, the utility model is further described.

The utility model is a sound-absorbing structure for a substation, as shown in Figure 1, it mainly includes a base surface 1 (wall base surface), which is different from the prior art in that: the base surface 1 is passed through light steel The keel 2 is connected to the protective panel 3, an air layer 4 is formed between the base surface 1 and the protective panel 3, and the inner surface of the protective panel 3 between the base surface 1 and the protective panel 3 is provided with a sound-absorbing non-woven fabric 5.

In specific implementation, one side of the light steel keel 2 is fixedly connected to the panel 3 through a blind rivet 6 , and a bead 7 is provided between the blind rivet 6 and the panel 3 .

In actual implementation, the other side of the light steel keel 2 is fixedly connected to the base surface 1 through expansion screws 8 .

During specific implementation, the thickness of the air layer 4 is 75mm-150mm.

During specific implementation, the thickness of the sound-absorbing non-woven fabric 5 is 0.1mm-0.4mm.

In specific implementation, the protective panel 3 is an aluminum plate or an insulating plate, and circular holes 9 are evenly distributed on the surface of the protective panel 3. The diameter of the circular holes 9 is 2.5mm-3mm, and the perforation rate on the surface of the protective panel 3 is 14%-18mm. %.

The DX type composite sound-absorbing structure is actually a perforated plate sound-absorbing structure or a resonant sound-absorbing structure, which uses a perforated panel, a special sound-absorbing non-woven fabric attached to the panel, and an air layer behind the panel to form a resonator. (Helmholtz resonator), when the frequency of the external sound wave is the same as the natural frequency of the resonator, resonance occurs, friction loss occurs during the resonance process, and sound energy is absorbed to achieve the effect of sound absorption. Because the amplitude of resonance is the largest, the speed of air vibration is also the largest, the friction loss is the largest, and the sound energy of sound absorption is the largest. Due to the structural form (perforation rate, aperture and air layer thickness), the resonant sound-absorbing structure has obvious low-frequency sound-absorbing characteristics. However, due to the factors of sound-absorbing non-woven fabrics, the composite sound-absorbing structure also has a certain sound-absorbing coefficient in the mid-high frequency range than the conventional porous resonant sound-absorbing structure. That is to say, the XDX type composite sound-absorbing structure has sound-absorbing characteristics in a wide frequency range. It not only has a high sound-absorption coefficient in the frequency range of 100-315Hz for transformer electromagnetic noise, but also has a certain sound-absorption effect in the frequency range above 315Hz. coefficient.

XDX type serial composite sound-absorbing structural protective panels can be divided into perforated aluminum panels and perforated insulating panels, and the thickness of the air layer is 75mm/100mm/150mm.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is limited to the above descriptions. For those of ordinary skill in the technical field to which the utility model belongs, on the premise of not departing from the concept of the utility model, some simple deduction or replacement can also be made, which should be regarded as belonging to the protection scope of the utility model.

Claims (6)

1. sound absorption construction that is used for transformer station, it mainly comprises basal plane (1), it is characterized in that: described basal plane (1) is connected with protection slab (3) by lightgage steel joist (2), form air layer (4) between basal plane (1) and the protection slab (3), protection slab (3) inner surface between basal plane (1) and the protection slab (3) is provided with acoustic absorption nonwoven fabrics (5).

2. a kind of sound absorption construction that is used for transformer station according to claim 1, it is characterized in that: described lightgage steel joist (2) one sides are fixedlyed connected with protection slab (3) by self-plugging rivet (6), are provided with press strip (7) between self-plugging rivet (6) and the protection slab (3).

3. a kind of sound absorption construction that is used for transformer station according to claim 1 is characterized in that: described lightgage steel joist (2) opposite side is fixedlyed connected with basal plane (1) by swell fixture (8).

4. a kind of sound absorption construction that is used for transformer station according to claim 1 is characterized in that: the thickness of described air layer (4) is 75mm-150mm.

5. a kind of sound absorption construction that is used for transformer station according to claim 1 is characterized in that: the thickness of described acoustic absorption nonwoven fabrics (5) is 0.1mm-0.4mm.

6. a kind of sound absorption construction that is used for transformer station according to claim 1, it is characterized in that: described protection slab (3) is aluminium sheet or insulating slab, protection slab (3) surface is evenly distributed with circular hole (9), the aperture of circular hole (9) is 2.5mm-3mm, and the perforated percentage on protection slab (3) surface is 14%-18%.

Images