CN111029112A - Noise-reduction double-sided sound-absorption barrier for transformer - Google Patents
Noise-reduction double-sided sound-absorption barrier for transformer Download PDFInfo
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- H01F27/33—Arrangements for noise damping
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Abstract
The invention relates to a noise-reducing double-sided sound-absorbing barrier for a transformer, which comprises an upper V-shaped part with an upward opening, a middle vertical part and a lower V-shaped part with a downward opening, wherein the upper V-shaped part and the lower V-shaped part are the same in structure and material, the left sides of the upper V-shaped part and the lower V-shaped part and the left side surface of the middle vertical part face one transformer noise source, and the right sides of the upper V-shaped part and the lower V-shaped part and the right side surface of the middle vertical part face the other transformer noise source; according to the characteristics of noise frequency generated by the transformer, the internal size of the sound absorption barrier is designed, so that the noise transmitted through the foundation and underground after the transformer oil tank is connected with the foundation can be effectively reduced, the noise can be effectively reduced from spreading to a far place in the air, the sound absorption barrier is particularly suitable for noise reduction and sound absorption of a plurality of transformers arranged in a row, the structure is stable, the sound absorption efficiency is high, the sound absorption and the noise reduction can be realized between the two transformers, the operation environment of the transformers is favorably improved, and the sound absorption barrier can effectively support an environment-friendly power grid.
Description
Technical Field
The invention belongs to the technical field of noise control, and particularly relates to a noise-reducing double-sided sound-absorbing barrier for a transformer.
Background
With the synchronous and rapid promotion of power grid construction and urban development, a plurality of transformer substations are inevitably built in urban centers or densely populated areas. The main electrical equipment transformer of transformer substation can produce the noise of variation in size in normal operating process, and these noises if not control and eliminate, can seriously influence the life, the rest of neighbouring resident.
There are three main modes of transformer noise propagation: the low-frequency noise of the transformer is transmitted through the ground after the oil tank is connected with the foundation, the low-frequency noise of the transformer is transmitted to the busbar through the conductive part on the sleeve pipe of the oil tank cover, and the noise of the transformer is transmitted through the ambient air. Noise reduction measures are taken in the way of transformer noise propagation, and development is continuously carried out along with the intensive research on transformer vibration and noise, such as: sound insulation treatment is carried out in the noise transmission path, and a proper and economic sound insulation plate is installed; the anti-noise with the same amplitude and phase difference with the noise of the transformer is set; the influence of the high-voltage side voltage on the iron core vibration is eliminated by designing a controller, so that the noise of the transformer and the like are reduced.
At present, a plurality of sound barriers are basically used for sound insulation of a certain transformer, and it is rare that sound insulation is simultaneously carried out on two transformers. The generated effect is mainly to act on the air noise generated by the transformer, and the micro-vibration transmitted to the foundation by the transformer is transmitted to the upper part through the structure to generate the structure noise, so that the effect is not enough. If a method for reducing air noise and effectively improving noise transmitted from a transformer through a foundation can be found, the method has important significance for improving the noise of the transformer.
Disclosure of Invention
The invention provides a noise-reducing double-sided sound-absorbing barrier for a transformer, which is characterized in that the internal size of the sound-absorbing barrier is designed according to the characteristic of noise frequency generated by the transformer, so that the noise transmitted through a foundation and the underground after the transformer oil tank is connected with the foundation can be effectively reduced, the noise can be effectively reduced from spreading to a far place in the air, and the noise-reducing double-sided sound-absorbing barrier is particularly suitable for noise reduction and sound absorption of a plurality of transformers arranged in a row.
The technical scheme adopted by the invention is as follows: a noise-reduction double-sided sound-absorbing barrier for a transformer comprises an upper V-shaped part with an upward opening, a middle vertical part and a lower V-shaped part with a downward opening, wherein the upper V-shaped part and the lower V-shaped part are the same in structure and material, the left sides of the upper V-shaped part and the lower V-shaped part and the left side surface of the middle vertical part face one transformer noise source, and the right sides of the upper V-shaped part and the lower V-shaped part and the right side surface of the middle vertical part face the other transformer noise source.
Go up the left side board of V-arrangement portion and include preceding orifice plate, preceding sound-absorbing layer and the preceding sheet steel that sets gradually from left to right, go up the right side board of V-arrangement portion and include back sheet steel, back sound-absorbing layer and the back orifice plate that sets gradually from left to right.
The middle vertical part comprises a vertical front pore plate, a vertical front sound absorbing layer, a middle steel plate, a vertical rear sound absorbing layer and a vertical rear pore plate which are sequentially arranged from left to right, the vertical front pore plate, the vertical front sound absorbing layer and the middle steel plate form a sound absorbing barrier for one transformer, and the middle steel plate, the vertical rear sound absorbing layer and the vertical rear pore plate form a sound absorbing barrier for another transformer.
The upper V-shaped part and the lower V-shaped part are both connected with the middle vertical part through a process connecting piece;
the process connecting piece comprises two V-shaped plates connected through a steel plate.
The front orifice plate and the rear orifice plate are made of the same material and size, the upright front orifice plate and the upright rear orifice plate are made of the same material and size, the materials are all metal perforated galvanized steel plates, and the thickness is 1 mm-1.5 mm.
The front sound absorbing layer and the rear sound absorbing layer are made of the same material and size, the upright front sound absorbing layer and the upright rear sound absorbing layer are made of the same material and size, and sound absorbing cotton wrapped by glass fiber cloth is selected, and the density of the sound absorbing cotton is 50g/m2～600g/m2The thickness d is determined by the following formula:
where is taken rhoA1+ρA2≥100kg/m2And c is the air sound velocity 340m/s, rho0The air density is 1.293kg/m3. d is 50 mm-80 mm.
The middle steel plate is a galvanized steel plate, and the thickness of the middle steel plate is 5 mm-8 mm.
The front thin steel plate and the rear thin steel plate are galvanized steel plates, and the thickness of the front thin steel plate and the rear thin steel plate is 1/2 of the thickness of the middle steel plate.
The lower V-shaped part is a part buried underground and has a height h1，h1The size of the lower V-shaped part is 1/3 degrees of the embedding depth of the transformer foundation, and the opening angle of the lower V-shaped part is 120-150 degrees.
The height of the upper V-shaped part is h2，h2Height and h of1And the opening angle of the lower V-shaped part is 115-145 degrees.
The height of the middle upright part is h3The height of the main oil tank of the transformer is h0，h3＝(1.1～1.3)×h0。
The invention has the advantages that: according to the noise-reduction double-sided sound-absorption barrier for the transformer, the structural size determined according to the characteristics of a transformer noise source is fully considered in the design of the internal composition structure of the barrier, so that the noise generated by the transformer is reduced; the upper V-shaped structure and the lower V-shaped structure of the noise reduction double-sided sound absorption barrier greatly weaken the noise transmitted through the foundation and the underground after the transformer oil tank is connected with the foundation, and can also effectively reduce the noise from spreading to a distance in the air; the upper V-shaped part and the lower V-shaped part are connected with the middle vertical part through a specially-made process connecting piece, so that the structure is firm. The sound absorption device has a stable structure and high sound absorption efficiency, can absorb sound and reduce noise between two transformers, is beneficial to improving the operating environment of the transformers, and can effectively support an environment-friendly power grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the middle upright part of the present invention;
FIG. 3 is a schematic view of a process connection of the present invention;
FIG. 4 is a schematic view of the connection of the process connection of the present invention.
In the drawings, there is shown in the drawings,
1-front orifice plate;
2-front sound absorbing layer;
3-front thin steel plate;
4-process connection;
5-rear sound absorption layer;
6-rear orifice plate;
7-intermediate steel plate;
8-rear thin steel plate;
9-vertical front orifice plate;
10-upright front sound absorbing layer;
11-upright rear sound absorbing layer;
12-upright rear orifice plate;
13-a pull bolt;
14-screw.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
Example 1
As shown in fig. 1, 2 and 4, the present invention includes an upper V-shaped portion with an upward opening, a middle upright portion and a lower V-shaped portion with a downward opening, wherein the upper V-shaped portion, the middle upright portion and the lower V-shaped portion with a downward opening are all divided into a left part and a right part, and the upper V-shaped portion and the lower V-shaped portion are made of the same material. The left sides of the upper and lower chevrons and the left side of the middle upright portion face one transformer noise source, and the right sides of the upper and lower chevrons and the right side of the middle upright portion face the other transformer noise source.
The left side plate of the upper V-shaped part comprises a front pore plate 1, a front sound absorption layer 2 and a front thin steel plate 3 which are sequentially arranged from left to right, and the right side plate of the upper V-shaped part comprises a rear thin steel plate 8, a rear sound absorption layer 5 and a rear pore plate 6 which are sequentially arranged from left to right; the middle vertical part comprises a vertical front pore plate 9, a vertical front sound absorbing layer 10, a middle steel plate 7, a vertical rear sound absorbing layer 11 and a vertical rear pore plate 12 which are sequentially arranged from left to right, and the vertical front pore plate 9, the vertical front sound absorbing layer 10 and the middle steel plate 7 are the left part of the middle vertical part to form a sound absorbing barrier for the transformer; the middle steel plate 7, the upright rear sound absorbing layer 11 and the upright rear perforated plate 12 constitute a sound absorbing barrier for another transformer for the right side portion of the middle upright portion.
The front orifice plate 1 and the rear orifice plate 6 are made of the same material and have the same size, the upright front orifice plate 9 and the upright rear orifice plate 12 are made of the same material and are made of metal perforated galvanized steel plates, and the thickness of the metal perforated galvanized steel plates ranges from 1mm to 1.5 mm.
The front sound absorbing layer 2 and the rear sound absorbing layer 5 are made of the same material and have the same size, the upright front sound absorbing layer 10 and the upright rear sound absorbing layer 11 are made of the same material and have the same size, and sound absorbing cotton wrapped by glass fiber cloth is selected, and the density of the sound absorbing cotton is 50g/m2～600g/m2The thickness d is determined by the following formula: the vibration frequency of the transformer during normal operation is usually 100Hz and integral multiples thereof, and is mainly low-order harmonic. Therefore, the resonant frequency f is designed as much as possible0Less than 100Hz of the incident vibration frequency.
Where is taken rhoA1+ρA2≥100kg/m2And c is the air sound velocity 340m/s, rho0The air density is 1.293kg/m3. d is 50 mm-80 mm.
The intermediate steel sheet 7 is a galvanized steel sheet having a thickness of 5mm to 8mm, and the thin steel sheet 3 and the rear thin steel sheet 8 are also galvanized steel sheets having a thickness of 1/2 the thickness of the intermediate steel sheet 7.
The lower V-shaped part is a part embedded into the ground and has a height h1，h1The size of the lower V-shaped part is 1/3 degrees of the embedding depth of the transformer foundation, and the opening angle of the lower V-shaped part is 120-150 degrees. The height of the V-shaped part is h2，h2Height and h of1And the opening angle of the lower V-shaped part is 115-145 degrees. Height of the middle upright part is h3The height of the main oil tank of the transformer is h0，h3＝(1.1～1.3)×h0，h3The value of the transformer can be adjusted correspondingly according to the difference of the capacity and the installation height of the transformer.
Example 2
This embodiment is consistent with the structure of embodiment 1, and a process connection member 4 for connecting the upper V-shaped portion, the middle standing portion, and the lower V-shaped portion is added on the basis of embodiment 1.
The present embodiment includes all the technical features of embodiment 1, that is, as shown in fig. 1, the present invention includes an upper V-shaped portion with an upward opening, a middle upright portion, and a lower V-shaped portion with a downward opening, each of the upper V-shaped portion, the middle upright portion, and the lower V-shaped portion with a downward opening can be divided into a left part and a right part, and the upper V-shaped portion and the lower V-shaped portion are made of the same material. The left sides of the upper and lower chevrons and the left side of the middle upright portion face one transformer noise source, and the right sides of the upper and lower chevrons and the right side of the middle upright portion face the other transformer noise source.
The left side plate of the upper V-shaped part comprises a front pore plate 1, a front sound absorption layer 2 and a front thin steel plate 3 which are sequentially arranged from left to right, and the right side plate of the upper V-shaped part comprises a rear thin steel plate 8, a rear sound absorption layer 5 and a rear pore plate 6 which are sequentially arranged from left to right; the middle vertical part comprises a vertical front pore plate 9, a vertical front sound absorbing layer 10, a middle steel plate 7, a vertical rear sound absorbing layer 11 and a vertical rear pore plate 12 which are sequentially arranged from left to right, and the vertical front pore plate 9, the vertical front sound absorbing layer 10 and the middle steel plate 7 are the left part of the middle vertical part to form a sound absorbing barrier for the transformer; the middle steel plate 7, the upright rear sound absorbing layer 11 and the upright rear perforated plate 12 constitute a sound absorbing barrier for another transformer for the right side portion of the middle upright portion.
As shown in fig. 3 and 4, the left side plate of the upper V-shaped part and the left side part of the middle standing part, the left side plate of the lower V-shaped part and the left side part of the middle standing part, the right side plate of the upper V-shaped part and the right side part of the middle standing part, and the right side plate of the lower V-shaped part and the right side part of the middle standing part are connected through a process connecting part 4, and the connection forms are the same.
The specific structure of the left side plate of the upper V-shaped portion connected to the left portion of the middle upright portion by the process connection member 4 will be described, and the connection form between the left side plate and the middle upright portion will be the same as that of the upper V-shaped portion. The process connecting piece 4 comprises two V-shaped plates connected through a steel plate, the space between the two V-shaped plates is used for clamping the left side plate of the upper V-shaped part and the left side part of the middle vertical part, the process connecting piece 4 is connected with the vertical rear hole plate 12 through a stay bolt 13, similarly, the stay bolt 13 is also adopted when the process connecting piece is connected with the front hole plate 1 and the rear hole plate 6, and the screws 14 are adopted when the V-shaped plates of the two adjacent process connecting pieces 4 are connected.
And is fixed by bolting or riveting.
The front orifice plate 1 and the rear orifice plate 6 are made of the same material and have the same size, the upright front orifice plate 9 and the upright rear orifice plate 12 are made of the same material and are made of metal perforated galvanized steel plates, and the thickness of the metal perforated galvanized steel plates ranges from 1mm to 1.5 mm.
The front sound absorbing layer 2 and the rear sound absorbing layer 5 are made of the same material and have the same size, the upright front sound absorbing layer 10 and the upright rear sound absorbing layer 11 are made of the same material and have the same size, and sound absorbing cotton wrapped by glass fiber cloth is selected, and the density of the sound absorbing cotton is 50g/m2～600g/m2The thickness d is determined by the following formula: the vibration frequency of the transformer during normal operation is usually 100Hz and integral multiples thereof, and is mainly low-order harmonic. Therefore, the resonant frequency f is designed as much as possible0Less than 100Hz of the incident vibration frequency.
Where is taken rhoA1+ρA2≥100kg/m2And c is the air sound velocity 340m/s, rho0The air density is 1.293kg/m3. d takes a value of 50mm to 80mm。
The intermediate steel sheet 7 is a galvanized steel sheet having a thickness of 5mm to 8mm, and the thin steel sheet 3 and the rear thin steel sheet 8 are also galvanized steel sheets having a thickness of 1/2 the thickness of the intermediate steel sheet 7.
The lower V-shaped part is a part embedded into the ground and has a height h1，h1The size of the lower V-shaped part is 1/3 degrees of the embedding depth of the transformer foundation, and the opening angle of the lower V-shaped part is 120-150 degrees. The height of the V-shaped part is h2，h2Height and h of1And the opening angle of the lower V-shaped part is 115-145 degrees. Height of the middle upright part is h3The height of the main oil tank of the transformer is h0，h3＝(1.1～1.3)×h0，h3The value of the transformer can be adjusted correspondingly according to the difference of the capacity and the installation height of the transformer.
The transformer with the voltage level of 110kV and the capacity of 50MVA and the two transformers with the voltage level of 220kV and the capacity of 240MVA are respectively applied, and the specific application effects are as follows:
the noise reduction double-sided sound absorption screen is applied between two oil immersed transformers with 110kV voltage level and 50MVA capacity, the thicknesses of front and rear pore plates of the noise reduction double-sided sound absorption screen are 1mm, the thicknesses of front and rear sound absorption cotton are 50mm, the thickness of a middle steel plate is 6mm, the thickness of a thin steel plate is 3mm, the upper V-shaped opening angle is 120 degrees, and the lower V-shaped opening angle is 130 degrees. Through tests, the comparison of the noise values of the environmental noise between the two transformers before and after the noise reduction double-sided sound absorption barrier is additionally arranged is shown in table 1.
The noise reduction double-sided sound absorption screen is applied between two oil immersed transformers with 220kV voltage class and 240MVA capacity, the thicknesses of front and rear pore plates of the noise reduction double-sided sound absorption screen are 1.5mm, the thicknesses of front and rear sound absorption cotton are 70mm, the thickness of a middle steel plate is 8mm, the thickness of a thin steel plate is 4mm, the upper V-shaped opening angle is 125 degrees, and the lower V-shaped opening angle is 125 degrees. Through tests, the comparison of the noise values of the environmental noise between the two transformers before and after the noise reduction double-sided sound absorption barrier is additionally arranged is shown in table 1.
TABLE 1 comparison of ambient noise values before and after installation of noise reduction and absorption shield between two transformers
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A noise-reduction double-sided sound-absorbing barrier for a transformer comprises an upper V-shaped part with an upward opening, a middle upright part and a lower V-shaped part with a downward opening, and is characterized in that the upper V-shaped part and the lower V-shaped part are made of the same material, the left sides of the upper V-shaped part and the lower V-shaped part and the left side surface of the middle upright part face one transformer noise source, and the right sides of the upper V-shaped part and the lower V-shaped part and the right side surface of the middle upright part face the other transformer noise source.
2. The noise reduction double-sided sound absorption barrier for the transformer according to claim 1, wherein the left side plate of the upper V-shaped part comprises a front hole plate (1), a front sound absorption layer (2) and a front thin steel plate (3) which are arranged from left to right in sequence, and the right side plate of the upper V-shaped part comprises a rear thin steel plate (8), a rear sound absorption layer (5) and a rear hole plate (6) which are arranged from left to right in sequence;
the middle vertical part comprises a vertical front pore plate (9), a vertical front sound absorbing layer (10), a middle steel plate (7), a vertical rear sound absorbing layer (11) and a vertical rear pore plate (12) which are sequentially arranged from left to right, the vertical front pore plate (9), the vertical front sound absorbing layer (10) and the middle steel plate (7) form a sound absorbing barrier for one transformer, and the middle steel plate (7), the vertical rear sound absorbing layer (11) and the vertical rear pore plate (12) form a sound absorbing barrier for another transformer.
3. A noise-reducing double-sided sound-absorbing barrier for transformers according to claim 1, characterised in that the upper and lower V-shaped portions are connected to the intermediate upright portion by a technical connection (4);
the process connecting piece (4) comprises two V-shaped plates connected through a steel plate.
4. The noise reduction double-sided sound absorption barrier for the transformer according to claim 2, wherein the front orifice plate (1) and the rear orifice plate (6) are made of metal perforated galvanized steel plates with the thickness of 1mm to 1.5mm, and the upright front orifice plate (9) and the upright rear orifice plate (12) are made of metal perforated galvanized steel plates with the same material and size.
5. The noise-reducing double-sided sound-absorbing barrier for the transformer as claimed in claim 2, wherein the front sound-absorbing layer (2) and the rear sound-absorbing layer (5) are made of the same material and have the same size, the upright front sound-absorbing layer (10) and the upright rear sound-absorbing layer (11) are made of the same material and have the same size, and the sound-absorbing cotton wrapped by glass fiber cloth is selected, and has a density of 50g/m2～600g/m2The thickness d is determined by the following formula:
where is taken rhoA1+ρA2≥100kg/m2And c is the air sound velocity 340m/s, rho0The air density is 1.293kg/m3And d is 50-80 mm.
6. The noise reduction double-sided sound absorption barrier for the transformer as claimed in claim 2, wherein the middle steel plate (7) is a galvanized steel plate and has a thickness of 5mm to 8 mm.
7. The noise reduction double-sided sound absorption barrier for the transformer as claimed in claim 6, wherein the front steel sheet (3) and the rear steel sheet (8) are galvanized steel sheets, and the thickness is 1/2 of the thickness of the middle steel sheet (7).
8. The noise-reducing double-sided sound-absorbing barrier for a transformer according to claim 1, wherein the lower V-shaped portion is buried in the groundLower part of height h1，h1The size of the lower V-shaped part is 1/3 degrees of the embedding depth of the transformer foundation, and the opening angle of the lower V-shaped part is 120-150 degrees.
9. The noise-reducing double-sided sound-absorbing barrier for transformers according to claim 1, wherein the height of the upper V-shaped portion is h2，h2Height and h of1And the opening angle of the lower V-shaped part is 115-145 degrees.
10. The noise-reducing double-sided sound-absorbing barrier for a transformer as claimed in claim 1, wherein the height of the middle standing part is h3The height of the main oil tank of the transformer is h0，h3＝(1.1～1.3)×h0。
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| CN201911197437.8A CN111029112B (en) | 2019-11-29 | 2019-11-29 | Noise-reduction double-sided sound-absorption barrier for transformer |
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| CN201911197437.8A CN111029112B (en) | 2019-11-29 | 2019-11-29 | Noise-reduction double-sided sound-absorption barrier for transformer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204803775U (en) * | 2015-06-09 | 2015-11-25 | 中铁十八局集团轨道交通工程有限公司 | Two -sided absorbent lined barrier |
| CN106284113A (en) * | 2015-06-29 | 2017-01-04 | 宜兴市昊诚环保科技有限公司 | A kind of two-sided acoustic screen |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204803775U (en) * | 2015-06-09 | 2015-11-25 | 中铁十八局集团轨道交通工程有限公司 | Two -sided absorbent lined barrier |
| CN106284113A (en) * | 2015-06-29 | 2017-01-04 | 宜兴市昊诚环保科技有限公司 | A kind of two-sided acoustic screen |
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