CN112942616B - Transformer firewall with sound absorption performance - Google Patents
Transformer firewall with sound absorption performance Download PDFInfo
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- CN112942616B CN112942616B CN202110122135.5A CN202110122135A CN112942616B CN 112942616 B CN112942616 B CN 112942616B CN 202110122135 A CN202110122135 A CN 202110122135A CN 112942616 B CN112942616 B CN 112942616B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 62
- 239000010410 layer Substances 0.000 claims abstract description 124
- 239000004567 concrete Substances 0.000 claims abstract description 84
- 238000009413 insulation Methods 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000002344 surface layer Substances 0.000 claims abstract description 22
- 239000011358 absorbing material Substances 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 9
- 239000004566 building material Substances 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 11
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- 238000010276 construction Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/66—Sealings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B1/86—Sound-absorbing elements slab-shaped
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/94—Protection against other undesired influences or dangers against fire
- E04B1/941—Building elements specially adapted therefor
- E04B1/942—Building elements specially adapted therefor slab-shaped
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/33—Arrangements for noise damping
Abstract
The application discloses a transformer firewall with sound absorption performance, which comprises a concrete wall surface layer; a porous sound-absorbing material layer comprising a particulate porous sound-absorbing building material or foamed cement; the perforated concrete layer is provided with a plurality of truncated cone-shaped micropores; the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are sequentially stacked to form a multi-layer composite sound absorption and insulation structure, and the perforated concrete layer is used as the outermost layer of the multi-layer composite sound absorption and insulation structure and faces the transformer. Through the mode, the transformer firewall adopts the building sound absorption material with good water resistance, fire resistance and weather resistance and the multilayer composite sound absorption and insulation structure, not only has the basic function of the firewall, but also realizes the sound absorption and insulation function, thereby more effectively controlling the noise of the transformer.
Description
Technical Field
The application relates to the technical field of transformers, in particular to a transformer firewall with sound absorption performance.
Background
In recent years, with the acceleration of urbanization progress, land resources are gradually tense, more and more transformer substations go deep into a central area of a city, the distance from each transformer substation to surrounding residents is greatly reduced, and the influence on the surrounding residents is great. The noise of the transformer substation is mainly generated by a main transformer, the frequency is low, the wavelength is large, the attenuation is slow, and the penetration is strong, but in the prior art, the overall effect of the equipment for sound insulation and noise reduction of the transformer is limited, and the requirements of users cannot be met.
Disclosure of Invention
The application provides a transformer prevents hot wall with sound absorption performance to solve among the prior art to the not good problem of noise reduction effect of transformer.
In order to solve the technical problem, the application provides a firewall is prevented to transformer with sound absorption performance, its characterized in that includes: a concrete wall surface layer; a porous sound absorbing material layer comprising granular porous sound absorbing building material or a foamy cement; the perforated concrete layer is provided with a plurality of truncated cone-shaped micropores; the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are sequentially stacked to form a multi-layer composite sound absorption and insulation structure, and the perforated concrete layer is used as the outermost layer of the multi-layer composite sound absorption and insulation structure and faces the transformer.
Alternatively, the inner walls of the micro-pores of the perforated concrete layer are arranged obliquely with respect to the thickness direction of the perforated concrete layer.
Alternatively, the cross section of the micro-pores of the perforated concrete layer is continuously varied in the thickness direction of the perforated concrete layer to form the inner wall of the step or curved structure.
Optionally, the layer of porous sound absorbing material comprises microporous rock.
Optionally, the thickness of the concrete wall layer, the porous sound absorbing material layer and the perforated concrete layer are the same.
Optionally, the thickness of the concrete wall layer, the porous sound absorbing material layer and the perforated concrete layer is 10 cm.
Optionally, the inner wall roughness of the micro-pores of the perforated concrete layer is greater than 50 μm.
Optionally, the cross-sectional area of the truncated cone-shaped micro-hole of the perforated concrete layer in the thickness direction changes in a trapezoid shape, the upper bottom edge of the trapezoid shape faces the transformer side, and the height of the trapezoid shape is 10 cm.
Optionally, the total thickness of the multilayer composite sound absorption and insulation structure does not exceed 30 cm.
The application provides a transformer firewall with sound absorption performance, which comprises a concrete wall surface layer; a porous sound-absorbing material layer comprising a particulate porous sound-absorbing building material or foamed cement; the perforated concrete layer is provided with a plurality of truncated cone-shaped micropores; the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are sequentially stacked to form a multi-layer composite sound absorption and insulation structure, and the perforated concrete layer is used as the outermost layer of the multi-layer composite sound absorption and insulation structure and faces the transformer. Through the mode, the transformer firewall adopts the building sound absorption material with good water resistance, fire resistance and weather resistance and the multilayer composite sound absorption and insulation structure, not only has the basic function of the firewall, but also realizes the sound absorption and insulation function, thereby more effectively controlling the noise of the transformer.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a front view of an embodiment of a transformer firewall with sound absorption capability according to the present application;
FIG. 2 is a schematic cross-sectional view of an embodiment of a transformer firewall with sound absorption capability according to the present application.
Detailed Description
In order to enable those skilled in the art to better understand the technical solution of the present application, a transformer firewall with sound absorption performance provided by the present application is further described in detail below with reference to the accompanying drawings and the detailed description.
Common sound absorbing structures include single-layer sound absorbing structures, double-layer sound absorbing structures, and multilayer composite sound absorbing structures. In sound insulation technology, a plate-shaped or wall-shaped sound insulation member is often called a partition or a partition wall, or simply called a wall. What is called a single wall with only one layer of partition; two or more layers with air or other material between them are called double or multi-layer walls.
The sound insulation performance of the single-layer homogeneous dense wall is related to the frequency of incident waves, and the frequency characteristics of the single-layer homogeneous dense wall depend on factors such as the surface density, the rigidity, the internal damping of materials, the boundary conditions of the wall and the like. The vibration of the plate may be described by a force resistance consisting of a force resistance and a force resistance, wherein the force resistance includes a mass resistance and a stiffness resistance. When the frequency is relatively low, the impedance is mainly stiffness, which decreases with increasing frequency, the vibration of the wall panel increases with increasing frequency, and the sound insulation performance decreases with increasing frequency. When the stiffness resistance is reduced to be equal to the mass resistance as the frequency is gradually increased, the effects of the stiffness resistance and the mass resistance cancel each other out, and the force resistance is equal to zero. The force resistance is the smallest and equal to the force resistance, and the vibration of the wallboard is the largest, namely, the resonance is generated. At this time, the sound insulation amount of the wall board appears to be a minimum value, and the magnitude depends on the damping of the component. When the frequency is increased to a certain degree, the sound insulation effect of the wallboard is reduced due to the inosculating effect.
The middle of the double-layer partition wall structure is generally an air layer or a sound absorption material, and the surface density of the first layer of wallboard is rho A1 The surface density of the second layer of wallboard is rho A2 The sound insulation of the double wall panel is generally calculated by the following formula:
in the formula: f is the frequency of the acoustic wave in Hz;
The additional sound insulation of the double wall panels is mainly determined by the size of the space between the double wall panels, the so-called air layer thickness,
increasing with increasing thickness. Generally, the distance is about 10cm, and after the distance exceeds 10cm, the additional amount is reduced due to the increase of the distance. The additional amount is also related to the double wall panel construction, as well as the wall construction.
A multi-layer composite structure for noise control engineering is a light multi-layer composite plate, which is a composite sound-insulating structure composed of several layers of plates with different surface densities or properties, and is composed of a protective layer made of metal or non-metal solid thin plates, and a damping material covered in the protective layer or filled in porous sound-absorbing material or air layer. Compared with a double-layer or double-layer structure made of the same material and the same quality, the sound insulation performance of the multilayer composite structure is obviously improved, mainly because the impedances of the layered materials are different, sound waves are reflected on each layer interface for multiple times, the impedance difference is large, and the more the reflected energy is, the less the transmitted sound energy is; secondly, the damping and sound absorption effects of the layered material enable sound energy to be attenuated and reduce resonance and anastomosis effects; and thirdly, by using a multilayer structure with different thicknesses and materials, the resonance frequency and the critical frequency of the anastomosis effect can be staggered, and the sound insulation underestimation of the anastomosis region of the resonance region is improved, so that the total sound insulation performance is greatly improved.
The application provides a transformer firewall with sound absorption performance, which adopts a multilayer composite sound absorption and insulation structure, thereby more effectively controlling the noise of a transformer; in addition, the building sound absorption material with good waterproof, fireproof and weather resistance is adopted, and the building sound absorption material can also have the basic function of a firewall.
Specifically, please refer to fig. 1 and fig. 2, fig. 1 is a schematic front view of an embodiment of a transformer firewall with sound absorption performance according to the present application; FIG. 2 is a schematic cross-sectional view of an embodiment of a transformer firewall with sound absorption capability according to the present application.
The sound-absorbing transformer firewall of the present embodiment may include a concrete wall surface layer 1, a porous sound-absorbing material layer 3, and a perforated concrete layer 4.
The porous sound-absorbing material layer 3 may include granular porous sound-absorbing building materials or foamed cement, wherein the granular porous sound-absorbing building materials may be novel granular porous sound-absorbing building materials formed by cohering natural sand, such as microporous rock.
The raw material of the microporous rock is plateau natural sand, and a large number of irregular and mutually communicated tiny pores are formed among sand grains naturally. Under the polymerization process, the grain size of sand grains and the polymerization mode can be accurately regulated and controlled, and then microporous rock stratums with different flow resistance and sound absorption characteristics can be produced. The microporous rock stratum has the advantages of excellent sound absorption performance, good sound insulation performance, environmental protection, attractive appearance, fire resistance, water resistance, frost resistance and impact resistance. The whole piece can be installed seamlessly, the construction is simple, and the operation is easy.
The multi-foam cement is foam cement, and is a novel light heat-insulating material containing a large number of closed air holes, which is formed by fully foaming a foaming agent in a mechanical mode through a foaming system of a foaming machine, uniformly mixing foam and cement slurry, then carrying out cast-in-place construction or mould forming through a pumping system of the foaming machine and carrying out natural curing. The multi-foam cement belongs to a bubble-shaped heat-insulating material, and is characterized in that closed foam pores are formed in concrete, so that the concrete can be lightened and heat-insulating effect can be realized.
The perforated concrete layer 4 may be a circular truncated cone-shaped micro-hole 2 which is arranged on the concrete layer and penetrates through the concrete layer. As shown in fig. 1, the truncated cone-shaped micropores 2 may be regularly distributed or irregularly distributed on the concrete layer. Wherein, the circular truncated cone-shaped micropores 2 can be used for enhancing the sound absorption performance of the concrete layer. The round platform-shaped micropores 2 can play an obvious role in attenuating sound waves, so that the absorption capacity of the transformer firewall to sound is increased.
As shown in fig. 2, the concrete wall surface layer 1, the porous sound absorbing material layer 3 and the perforated concrete layer 4 may be sequentially stacked to form a multi-layer composite sound absorbing and insulating structure, and the perforated concrete layer 4 may serve as an outermost layer of the multi-layer composite sound absorbing and insulating structure and face the transformer. The sound absorption performance of the structure is excellent.
Alternatively, the porous sound absorbing material layer 3 and the concrete wall surface layer 1 and the perforated concrete layer 4 may be fixed by lining with cement mortar.
In the multilayer composite sound absorption and insulation structure of the embodiment, the transformer firewall is excited by sound waves, and the round platform-shaped micropores 2 on the perforated concrete layer 4 facing the transformer can absorb the sound waves in a large amount.
The upper bottom surface circle with the small diameter of the circular truncated cone-shaped micro-hole 2 can be positioned on the surface of the perforated concrete layer 4, namely relatively close to the transformer; the lower base circle with the large diameter of the truncated cone-shaped micro-pores 2 may be located inside the perforated concrete layer 4, i.e. relatively far away from the transformer.
As shown in fig. 1, the solid line part is a small-diameter upper bottom circle of the truncated cone-shaped micropore 2 and is positioned on the surface of the perforated concrete layer 4; the dotted line part is a large-diameter lower bottom surface circle of the circular truncated cone-shaped micro-hole 2 and is positioned inside the perforated concrete layer 4.
When the noise sound wave of the transformer is incident into the truncated cone-shaped micropore 2, the incident sound wave wavelengths of different parts of the truncated cone-shaped micropore 2 are different, and the attenuation of the sound wave at the part of the truncated cone-shaped micropore 2 with the longer wavelength is larger. The sound wave can vibrate in the round platform-shaped micropore 2, when the frequency of the incident sound wave is identical with the natural frequency of the structure, the structure can generate resonance, and the energy loss caused at the moment is the largest.
The sound waves reflected by the truncated cone-shaped minute holes 2 can be incident on the porous sound-absorbing material layer 3. The porous sound absorbing material layer 3 may have many minute gaps and continuous bubbles, thereby having a certain air permeability. When sound waves are incident on the surface of the porous sound absorption material layer 3, air in the small holes or the gaps moves due to vibration generated by the sound waves, friction with the hole walls is caused, and air close to the hole walls and the surface of the porous sound absorption material layer 3 is not easy to move under influence. Due to the friction and viscous forces, a considerable portion of the sound energy is converted into heat energy, which attenuates the sound waves and attenuates the reflected sound.
Finally, the transformer noise sound waves attenuated by the plurality of layers can enter the concrete wall surface layer 1 from the porous sound-absorbing material layer 3 and penetrate through the concrete wall surface layer 1. Because the concrete wall surface layer 1 has poor air permeability, the concrete wall surface layer also has a certain effect of hindering the propagation of sound waves.
Further, the hole depth of the micro-holes 2 of the perforated concrete layer 4 may affect the resonance absorption peak. Increasing the hole depth can shift the resonance absorption peak to lower frequencies. Therefore, in order that the hole depth can be increased without changing the thickness of the perforated concrete layer 4, it is preferable that the inner walls of the micro-holes 2 of the perforated concrete layer 4 be disposed obliquely with respect to the thickness direction of the perforated concrete layer 4.
Alternatively, the cross section of the micro-pores 2 of the perforated concrete layer 4 may be continuously varied in the thickness direction of the perforated concrete layer 4 to form an inner wall of a stepped or curved structure. By the mode, the acoustic impedance in the hole depth direction can be continuously changed, and the sound absorption coefficient is favorably improved.
Alternatively, the thickness of the concrete wall surface layer 1, the porous sound absorbing material layer 3 and the perforated concrete layer 4 may be the same. The multilayer structure with the same thickness can absorb high-frequency noise, medium-low frequency noise and remarkable sound absorption effect. Preferably, the thickness of the concrete wall surface layer 1, the porous sound absorption material layer 3 and the perforated concrete layer 4 can be 10cm, and the total thickness of the multilayer composite sound absorption and insulation structure is not more than 30 cm.
Alternatively, the roughness of the inner wall of the micro-holes 2 of the perforated concrete layer 4 may be more than 50 μm, and since the inner wall of the micro-holes 2 is rough and uneven, when sound waves pass through the micro-holes 2, there is a certain attenuation, and thus the acoustic resistance may be further increased. And the sound waves after attenuation can continue to be incident on the porous sound-absorbing material layer 3.
Alternatively, the cross-sectional area of the truncated cone-shaped micro-pores 2 of the perforated concrete layer 4 in the thickness direction changes in a trapezoidal shape, and the upper base edge of the trapezoidal shape faces the transformer side and is aligned, and the height of the trapezoidal shape may be equal to the thickness of the perforated concrete layer 4. Preferably, when the thickness of the perforated concrete layer 4 is 10cm, the height of the trapezoid may be 10 cm.
The application provides a transformer firewall with sound absorption performance, which comprises a concrete wall surface layer; a porous sound-absorbing material layer comprising a particulate porous sound-absorbing building material or foamed cement; the perforated concrete layer is provided with a plurality of truncated cone-shaped micropores; the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are sequentially stacked to form a multi-layer composite sound absorption and insulation structure, and the perforated concrete layer is used as the outermost layer of the multi-layer composite sound absorption and insulation structure and faces the transformer. Through the mode, the transformer firewall adopts the building sound absorption material with good water resistance, fire resistance and weather resistance and the multilayer composite sound absorption and insulation structure, not only has the basic function of the firewall, but also realizes the sound absorption and insulation function, thereby more effectively controlling the noise of the transformer.
It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. In addition, for convenience of description, only a part of structures related to the present application, not all of the structures, are shown in the drawings. The step numbers used herein are also for convenience of description only and are not intended as limitations on the order in which the steps are performed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (8)
1. A transformer firewall with sound absorption properties, comprising:
a concrete wall surface layer;
a porous sound absorbing material layer comprising a microporous rock;
the perforated concrete layer is provided with a plurality of truncated cone-shaped micropores;
the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are sequentially stacked to form a multi-layer composite sound absorption and insulation structure, and the perforated concrete layer is used as the outermost layer of the multi-layer composite sound absorption and insulation structure and faces the transformer;
the porous sound absorption material layer, the concrete wall surface layer and the perforated concrete layer are fixedly attached through cement mortar in a lining mode.
2. Transformer firewall according to claim 1,
the inner wall of the micropore of the perforated concrete layer is obliquely arranged relative to the thickness direction of the perforated concrete layer.
3. Transformer firewall according to claim 1,
the cross section of the micropore of the perforated concrete layer continuously changes along the thickness direction of the perforated concrete layer to form the inner wall of a step or a curved surface structure.
4. Transformer firewall according to claim 1,
the concrete wall surface layer, the porous sound absorption material layer and the perforated concrete layer are the same in thickness.
5. Transformer firewall according to claim 4,
the thickness of concrete wall surface layer, porous sound absorbing material layer and perforation concrete layer is 10 cm.
6. Transformer firewall according to claim 1,
the roughness of the inner wall of the micropores of the perforated concrete layer is more than 50 mu m.
7. Transformer firewall according to claim 5,
the cross-sectional area of the round platform-shaped micropore of the perforated concrete layer along the thickness direction is in a trapezoidal change, the upper bottom edge of the trapezoid faces the side of the transformer, and the height of the trapezoid is 10 cm.
8. Transformer firewall according to claim 1,
the total thickness of the multilayer composite sound absorption and insulation structure is not more than 30 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2020115991341 | 2020-12-29 | ||
| CN202011599134 | 2020-12-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE59904890D1 (en) * | 1998-12-17 | 2003-05-08 | Etis Ag Teufen | SOUND INSULATION FOR INSULATING SOUND GENERATING DEVICES OR SYSTEM PARTS, ESPECIALLY VIBRATION FEEDING DEVICES OR. vibrators |
| CN205177403U (en) * | 2015-08-31 | 2016-04-20 | 中国电力科学研究院 | Noise reduction sound absorption layer |
| CN108004948A (en) * | 2018-01-09 | 2018-05-08 | 杨小武 | The enhanced GRC sound insulationg boards of monoblock type |
| CN208734205U (en) * | 2018-07-24 | 2019-04-12 | 铜陵天瑞建筑有限责任公司 | A kind of building enclosing with sound-absorbing effect |
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