CN215731269U - Low-noise power transformer oil tank - Google Patents
Low-noise power transformer oil tank Download PDFInfo
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- CN215731269U CN215731269U CN202120927897.8U CN202120927897U CN215731269U CN 215731269 U CN215731269 U CN 215731269U CN 202120927897 U CN202120927897 U CN 202120927897U CN 215731269 U CN215731269 U CN 215731269U
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Abstract
The utility model provides a low-noise power transformer oil tank which comprises an oil tank inner layer, an oil tank outer layer and a sound insulation layer arranged between the oil tank inner layer and the oil tank outer layer; the sound insulation layer comprises a grid frame and a plurality of sound absorption and insulation materials arranged in the grid frame, the arrangement mode of the sound absorption and insulation materials is determined by the inner layer of the oil tank and the outer layer of the oil tank based on the minimum transmission sound pressure of the wall plate.
Description
Technical Field
The utility model relates to the field of power transmission and transformation, in particular to a low-noise power transformer oil tank.
Background
With the rapid development of economic construction and the acceleration of urbanization process, various commercial buildings, public supporting buildings and residential groups are emerging continuously, transformers are widely used as supporting electric power facilities, and with the higher and higher requirements of people on life quality, noise generated by the transformers has serious influence on people. The prior art generally considers the prevention of the invasion of foreign objects and electromagnetic radiation so as to avoid the damage of the transformer and the pollution to the surrounding environment. The main noise source of the transformer substation is an oil-immersed transformer, and in order to reduce the interference of noise to surrounding residents, the requirement on the noise of the transformer is higher and higher, and the noise is not limited to preventing the intrusion of foreign objects and electromagnetic radiation, and therefore, a new low-noise transformer noise reduction technology needs to be provided.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that an oil immersed transformer adopted in a transformer substation in the prior art can generate noise and influence the life quality of surrounding residents, the utility model provides a low-noise power transformer oil tank, which comprises an oil tank inner layer, an oil tank outer layer and a sound insulation layer arranged between the oil tank inner layer and the oil tank outer layer;
the sound insulation layer comprises a grid framework and a plurality of sound absorption and insulation materials arranged in the grid framework.
Preferably, the grid framework is arranged by adopting rhombic, triangular or circular unit grids.
Preferably, the plurality of sound absorption and insulation materials comprise: at least two of rubber damping material, aerogel material, foamed ceramic material, foamed aluminum material, rock wool and metal fiber sheet.
Preferably, the inner layer of the oil tank is made of a steel plate;
the outer layer of the oil tank is made of metal materials or non-metal materials.
Preferably, the outer layer of the oil tank is made of carbon steel, stainless steel, an aluminum alloy material, a carbon fiber composite board or organic glass.
Preferably, the thickness of the outer layer of the oil tank is smaller than that of the inner layer of the oil tank.
Preferably, the distance between the inner layer of the oil tank and the outer layer of the oil tank is not more than 2 cm.
Preferably, when the unit grids in the grid frame are triangular or square, the effective side length of the unit grids does not exceed 1% of the wavelength of the radiation noise of the transformer.
Preferably, when the unit grid in the grid frame is circular, the effective radius of the unit grid is not more than 1% of the wavelength of the radiated noise of the transformer.
Preferably, the inner surface of the inner layer of the fuel tank and the outer surface of the outer layer of the fuel tank are coated with a protective layer.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a low-noise power transformer oil tank which comprises an oil tank inner layer, an oil tank outer layer and a sound insulation layer arranged between the oil tank inner layer and the oil tank outer layer; the utility model can effectively inhibit the projection and propagation of low-frequency sound waves generated by the oil-immersed transformer in the box body structure and reduce the noise by arranging the multiple sound absorption and insulation materials arranged in a permutation and combination mode between the inner layer and the outer layer of the oil tank.
Drawings
FIG. 1 is a schematic view of the overall structure of the low noise power transformer tank of the present invention;
FIG. 2 is a schematic cross-sectional view of a low noise power transformer tank of the present invention;
fig. 3(a) is a schematic view showing a first combination arrangement of filling two sound absorption and insulation materials in the sound insulation layer internal network frame of the utility model;
FIG. 3(b) is a schematic view showing a second combined arrangement of filling two sound absorbing and insulating materials into the internal network frame of the sound insulating layer according to the present invention;
FIG. 4 is a flow chart of a method for determining arrangement and combination of filling sound absorption and insulation materials in a network frame inside a sound insulation layer by adopting a particle swarm intelligent algorithm;
the oil tank comprises an oil tank outer layer 1, an oil tank inner layer 2, an oil tank inner layer 3, a grid frame 4 and aerogel materials; 5. a damping material.
Detailed Description
The utility model discloses a low-noise power transformer oil tank which is provided by combining a noise transmission path of oil-immersed power equipment aiming at the defects of the noise reduction measures of the existing oil-immersed transformer.
The rectangular frame sandwich structure is added between the inner wall and the outer wall of the transformer oil tank, and a certain amount of additional rubber material and aerogel material are matched to play a role in inhibiting transmission and propagation of low-frequency sound waves in the transformer tank body structure. The method can effectively improve the sound insulation of the transformer oil tank wall and reduce the radiation noise of the transformer.
Example 1: a low-noise power transformer oil tank is shown in figures 1 and 2 and comprises an oil tank inner layer, an oil tank outer layer, a grid frame and an internal filling material.
The inner layer of the oil tank is a steel plate, the inner layer is directly contacted with the transformer insulating oil, and the surface of the inner layer steel plate is coated according to the conventional transformer.
The outer layer of the oil tank is a steel plate or an aluminum plate, the surface of the outer layer is in contact with air, and external coating is carried out according to a conventional transformer, so that the metal plate and a welding part are prevented from being corroded.
The grid framework is arranged between the inner layer and the outer layer of the oil tank, the main body of the framework can be made of metal materials, can also be made of nonmetal materials, and can be arranged in a rectangular grid shape, or can be arranged in a rhombic, triangular or circular grid shape, for example, two different arrangement modes of two sound absorption and insulation materials are shown in fig. 3(a) and fig. 3(b), the arrangement and combination modes of the different filled sound absorption and insulation materials are determined according to the value of the impedance coefficient k of the sound absorption and insulation materials filled in the framework, and the aerogel materials 4 and the damping materials 5 are sequentially arranged at intervals in fig. 3 (a); and the aerogel material 4 and the damping material 5 are also spaced apart in fig. 3(b), but the damping material 5 and the aerogel material 4 are both in the same column.
And each unit in the grid framework is filled with sound absorption and insulation materials which are mainly aerogel materials and rubber damping materials.
The two materials filled in the grid frame can be optimally arranged and combined by adopting an intelligent algorithm according to the surface vibration and noise radiation conditions of the transformer box body to obtain the optimal arrangement combination, as shown in fig. 4:
(1) setting a sound insulation performance parameter of the wall of the transformer box;
(2) initializing particle group speed and position;
(3) acoustic finite element software for calculating transmission sound pressure PtAn optimization objective function of;
(4) establishing a penalty function and a fitness function;
(5) calculating individual extreme values and global extreme values of the particle swarm;
(6) transmission sound pressure PtIf the value is the optimal value, entering the step (7) if the value is the optimal value, otherwise returning to the step (3);
(7) output transmission sound pressure PtAnd the transmission sound pressure PtAnd (4) corresponding fitness.
The method comprises the following specific steps:
the sound insulation performance of the transformer box body wall plate is optimized and resolved into a multi-constraint optimization problem of an objective function. And (3) optimizing the acoustic performance of the box wall by using a particle swarm algorithm, and most importantly, establishing an optimized mathematical model to further construct a fitness function as an optimizing direction of the initialized particles. The fitness function of the acoustic performance optimization particle swarm algorithm is constructed by taking a transmission sound pressure minimum method as an example. The transmission sound pressure of the wall plate is PtThe expression is shown in formula 1, and the incident sound pressure function P of the box wallrWhen the minimum value is obtained by formula 1, the refraction and reflection energy dissipation R through the wall plate structure shows that the sound insulation quantity of the wall plate is optimal. The wall plate structure has impedance characteristics, a function R is defined, and the influencing parameter comprises the thickness h of the two-layer plate1、h2The distance d between the two layers of plates and the impedance coefficient k of the sound absorption and insulation material filled inside the two layers of plates depend on the characteristics, the size, the distribution mode and the thickness of the material.
Pt＝Pr-R(h1、h2、d、k....) (1)
The optimization inequality constraint conditions are as follows: (1) thickness h of the panel: h is less than or equal tomax](ii) a (2) The distance d: d is less than or equal tomax](ii) a (3) Impedance coefficient: k is less than or equal to [ k >max](ii) a Its mathematical model can be expressed as:
wherein f (P)t) Optimization function for acoustic properties of the panel, gj(Pt) Is the jth inequality constraint condition constraint. The objective function and the constraint function are generally nonlinear functions of design variables, so the method using the penalty function herein converts the constrained structure optimization problem into a structure optimization problem containing only boundary constraint, i.e. the algorithm contains infeasible solutions, but the infeasible solutions cannot become the optimal solution by adding the penalty function behind the objective function to penalize the appearance of the infeasible solutions. According to different constraint conditions, a plurality of penalty functions can be designed, once the constraint conditions are exceeded, the penalty functions play a role, and overproof values are automatically eliminated. Penalty function fviCan be expressed as:
wherein alpha isiAnd betajA is a penalty factor, a and b are constraint condition ranges, and f is not penalized for the value meeting the constraint conditionviWhen the value is 0, the value does not meet the constraint condition, the function values are amplified and eliminated in the optimization process. Constructing a plurality of penalty function items by a plurality of constraint conditions to finally obtain fitness (P)t) As input functions for the particle swarm algorithm:
wherein, fitness (P)t) Transmitting sound pressure P for the paneltCorresponding fitness; f (P)t) Transmitting sound pressure for the panel; f. ofvi: one of the penalty functions in the optimization process; f. ofui: another penalty function in the optimization process.
The arrangement and combination of different sound absorption and insulation materials directly influence the sound insulation effect of the board, the distribution characteristics of different frequency band noises are changed, the board is caused to transmit to obtain a sound pressure function to change, the change can be reflected through a fitness function, and the distribution mode of the optimal sound insulation effect can be found out through an optimization algorithm.
Calculating by acoustic finite element software to obtain the transmission sound pressure PtAnd calculating a fitness (P)t) And returning the calculation result to the particle swarm optimization for optimization calculation, randomly generating a new group of constraint conditions according to the value of the fitness value, and outputting the new group of constraint conditions to the acoustic finite element software for next calculation until the result is converged to obtain an optimal solution.
The outline size and the thickness of the inner layer of the oil tank are consistent with those of a conventional transformer, and the stress deformation conditions of the transformer in delivery, transportation, hoisting and the like are met.
The distance between the outer layer and the inner layer of the oil tank is controlled within 2cm, the outline size of the outer layer of the oil tank needs to be installed by considering oil pipe flanges and other equipment, and the thickness can be smaller than that of the inner wall but not smaller than 4mm because the outer layer does not bear the stress of the main structure of the transformer.
The outer layer of the oil tank is made of metal materials, such as carbon steel, stainless steel, aluminum alloy materials and the like; non-metallic materials such as carbon fiber composite plates, organic glass and the like can also be adopted.
The net-shaped frame is connected with the inner layer and the outer layer of the transformer oil tank in an adhesive way, and the inside of the net-shaped frame is filled with sound absorption and insulation materials.
Through the calculation, the area of the unit grid is not required to be too large when the sound absorption and insulation material adopts aerogel materials and rubber damping materials, when triangular or square unit grids are sampled, the effective side length of the unit grids is preferably not more than 1% of the wavelength of the radiation noise of the transformer, and when circular unit grids are sampled, the effective radius of the unit grids is preferably not more than 1% of the wavelength of the radiation noise of the transformer.
The arrangement and arrangement method of the sound absorption and insulation materials is characterized in that an optimal arrangement mode is obtained through calculation according to particle swarm intelligent algorithm, topological optimization and other methods, and a periodic noise reduction characteristic is formed.
Noise generated by vibration of the large oil-immersed transformer core winding. Due to the good coupling of the insulation and the tank structure, the generated noise radiates outwards through the tank wall. If a layer of sound absorption and insulation material is added in the center of the inner part of the oil tank wall, the periodic noise reduction characteristic is formed through different arrangement and combination modes. According to the low-noise power transformer oil tank provided by the utility model, the inner layer of the oil tank adopts a conventional transformer design, only the outer layer is added to protect the internal grid frame structure, the cost is low, the integral shape of the appearance of the tank wall is not influenced, and the low-noise power transformer oil tank can be used for a long time without maintenance.
Example 2
The oil-immersed transformer oil tank inlayer is thickness 10mm steel sheet, outer tank wall is thickness 4mm aluminum plate, intermediate layer's net frame is 200mm (length) x 10mm (width) x 2mm (thickness) aluminum alloy strip, the rectangle net size is 200mm x 200mm, it is 10mm to fill sound-absorbing and insulating material thickness, adopt two kinds of material mutual alternate arrangement modes of aerogel and rubber damping, the oil tank inlayer and inlayer double plates compress tightly the bonding each other, edge seam department adopts the welding mode sealed.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (10)
1. A low-noise power transformer oil tank is characterized by comprising an oil tank inner layer, an oil tank outer layer and a sound insulation layer arranged between the oil tank inner layer and the oil tank outer layer;
the sound insulation layer comprises a grid framework and a plurality of sound absorption and insulation materials arranged in the grid framework.
2. The low noise power transformer tank of claim 1, wherein said grid framework is arranged in a diamond, triangular or circular grid of cells.
3. The low noise power transformer tank of claim 1, wherein the plurality of sound absorbing and insulating materials comprises: at least two of rubber damping material, aerogel material, foamed ceramic material, foamed aluminum material, rock wool and metal fiber sheet.
4. A low noise power transformer tank as claimed in claim 1, wherein said tank inner layer is made of steel plate;
the outer layer of the oil tank is made of metal materials or non-metal materials.
5. The low noise power transformer tank of claim 1, wherein the outer layer of the tank is made of carbon steel, stainless steel, aluminum alloy material, carbon fiber composite board or organic glass.
6. A low noise power transformer tank as claimed in claim 1, wherein said tank outer layer has a thickness less than said tank inner layer.
7. A low noise power transformer tank as claimed in claim 1, wherein the distance between the inner tank layer and the outer tank layer is no more than 2 cm.
8. A low noise power transformer tank as claimed in claim 2, wherein when the unit cells in the grid framework are rhombus or triangle, the effective side length of the unit cell is not more than 1% of the wavelength of the radiated noise of the transformer.
9. A low noise power transformer tank as claimed in claim 2, wherein when the unit cells in the grid framework are circular, the effective radius of the unit cells is no more than 1% of the wavelength of the radiated noise of the transformer.
10. A low noise power transformer tank as claimed in claim 1, wherein the inner surface of the inner tank layer and the outer surface of the outer tank layer are each coated with a protective layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120927897.8U CN215731269U (en) | 2021-04-30 | 2021-04-30 | Low-noise power transformer oil tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120927897.8U CN215731269U (en) | 2021-04-30 | 2021-04-30 | Low-noise power transformer oil tank |
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| CN215731269U true CN215731269U (en) | 2022-02-01 |
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| CN202120927897.8U Active CN215731269U (en) | 2021-04-30 | 2021-04-30 | Low-noise power transformer oil tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4312236A1 (en) * | 2022-07-13 | 2024-01-31 | TenneT TSO GmbH | Transformer housing, transformer having such a transformer housing, and arrangements of these |
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2021
- 2021-04-30 CN CN202120927897.8U patent/CN215731269U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4312236A1 (en) * | 2022-07-13 | 2024-01-31 | TenneT TSO GmbH | Transformer housing, transformer having such a transformer housing, and arrangements of these |
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