CN114188134A - A noise reduction structure and power transformer for reducing noise at the corner of the iron core - Google Patents

Abstract

The present invention shows a noise reduction structure and a power transformer for reducing noise at the corner of an iron core, comprising a plurality of silicon steel sheets, the two silicon steel sheets are spliced to form a level, the two silicon steel sheets are vertically connected, and each of the two silicon steel sheets is vertically connected. There is a gap at the connection of the two silicon steel sheets in the level, the three levels are stacked to form a group level, and the three levels are the first level, the second level and the third level in sequence, and between the three levels An insulating film is provided, the thickness of the insulating film is smaller than that of the slit, and the distance between the slit of the first level and the slit of the second level is the same as the distance between the slit of the second level and the slit of the third level. The spacing is equal, which can effectively reduce the noise of the iron core.

Description

Noise reduction structure for reducing noise at corner of iron core and power transformer

[ technical field ] A method for producing a semiconductor device

The invention relates to a noise reduction structure for reducing noise at a corner of an iron core and a power transformer, and belongs to the technical field of power transformers.

[ background of the invention ]

As large-scale power equipment, a high-voltage shunt reactor or a power transformer plays an important role in a power transmission and transformation system, and the noise of the high-voltage shunt reactor or the power transformer is an important influence factor of the noise of a transformer substation. In particular, the transformer/reactor is tested or operated, and large vibration and noise pollution are generated. The realization of low noise of power transmission and transformation equipment is an urgent problem to be solved by manufacturers.

Noise of large-scale power equipment such as a transformer, a reactor and the like mainly comes from iron cores, including iron core vibration caused by magnetostriction of silicon steel sheets, iron core vibration caused by electromagnetic force generated by magnetic flux leakage at joints of the silicon steel sheets and between laminated sheets, and the like. Reducing core noise is a fundamental and effective measure.

[ summary of the invention ]

The invention aims to provide a noise reduction structure and a power transformer for reducing the noise of the corner of an iron core, which can effectively reduce the noise of the iron core.

The technical scheme adopted by the invention is as follows:

the utility model provides a reduce structure of making an uproar that falls of iron core bight noise, includes polylith silicon steel sheet, two silicon steel sheet concatenations form a level, two silicon steel sheets are perpendicular connection, the junction of two silicon steel sheets is equipped with the gap in every level, three level piles up and forms a group level, three level is first level, second level and third level in proper order, be equipped with the insulating film between every level, the thickness of insulating film is less than the gap, the gap place plane of first level with the length direction of one of them silicon steel sheet of first level is perpendicular, the gap place plane of second level all is the slope with the length direction of two silicon steel sheets of second level, the gap place plane of third level with the length direction of one of them silicon steel sheet of first level is perpendicular, interval between the gap of first level and the gap of second level with the gap of second level and the gap of third level The spacing therebetween is equal.

The beneficial effects of the invention are as follows:

the two silicon steel sheets are spliced into one level, three levels are stacked to form a group level, the three levels are a first level, a second level and a third level in sequence, the plane of the gap of the first level is vertical to the length direction of one of the silicon steel sheets of the first level, the plane of the gap of the second level is inclined to the length direction of the two silicon steel sheets of the second level, the plane of the gap of the third level is vertical to the length direction of one of the silicon steel sheets of the first level, an insulating film is arranged between each level, and as the thickness of the insulating film is smaller than the width of the gap, the magnetic flux between each level passes through the insulating film of the layer twice, the gap crossing the level is realized, so that a loop of the magnetic flux is completed, and the area of the magnetic flux leakage crossing at the corner part can be enlarged by adopting the seam structure, thereby reduce the density of magnetic leakage magnetic flux, under the unchangeable circumstances of total magnetic flux, magnetic leakage magnetic flux density reduces, and the eddy current size that its response produced also can reduce, and then the electromagnetic force that produces in the pile direction also can reduce, and the electromagnetic force reduces the back, also can make vibration amplitude between the silicon steel sheet lamination reduces, and the noise also can reduce thereupon to the function of making an uproar falls in the realization.

Preferably, the first-level slit and the third-level slit are located on both sides of the second-level slit.

Preferably, the included angle between the plane of the gap of the second level and the length direction of the two silicon steel sheets of the second level is 45 °.

Preferably, the noise reduction structure comprises a plurality of group levels, which are stacked on top of each other.

Preferably, the gap of each level is 0.5-2 mm.

Preferably, the thickness of the insulating film is 2 to 4 μm.

The invention also provides a power transformer which comprises an iron core, wherein the iron core is provided with the noise reduction structure for reducing the corner noise of the iron core.

Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a schematic diagram of a first level structure according to embodiment 1 of the present invention;

FIG. 3 is a diagram illustrating a second level structure according to embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a third level in embodiment 1 of the present invention;

fig. 5 is a magnetic flux distribution diagram in example 1 of the present invention.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Example 1:

as shown in fig. 1 to 5, the present embodiment shows a noise reduction structure for reducing corner noise of an iron core, including a plurality of silicon steel sheets, where the two silicon steel sheets are vertically connected, a gap is disposed at a joint of two silicon steel sheets in each level, the three levels are stacked to form a group level, the three levels are sequentially a first level, a second level and a third level, two silicon steel sheets in the first level are respectively a first silicon steel sheet 11 and a second silicon steel sheet 12, two silicon steel sheets in the second level are respectively a third silicon steel sheet 21 and a fourth silicon steel sheet 22, two silicon steel sheets in the third level are respectively a fifth silicon steel sheet 31 and a sixth silicon steel sheet 32, a plane where a gap 13 of the first level is located is perpendicular to a length direction of the second silicon steel sheet 12, a plane where a gap 23 of the second level is located is 45 degrees from the length directions of the third silicon steel sheet 21 and the fourth silicon steel sheet 22, the plane of the third-level gap 33 is perpendicular to the length direction of the fifth silicon steel sheet 31, the first-level gap 13 and the third-level gap 33 are respectively located at two sides of the second level, it is understood that in other embodiments, a plurality of groups of levels may be provided, and then the silicon steel sheets of each level are arranged according to the above rule.

In this embodiment, the gap of each layer is 0.5-2 mm, an insulating film is arranged between each layer, and the insulating film can play an insulating role, and the thickness of the insulating film in this embodiment is 2-4 μm, and since the thickness of the insulating film is much smaller than the width of the gap, the magnetic flux between each layer passes through the insulating film between layers twice, so as to realize the gap crossing the layer, thereby completing the return circuit of the magnetic flux.

The principle of the embodiment is as follows, as shown in fig. 5, when the magnetic flux flows from the first silicon steel sheet 11 to the second silicon steel sheet 12, because the first-level gap 13 exists between the first silicon steel sheet 11 and the second silicon steel sheet 12, the magnetic flux is blocked when passing through the gap, and cannot directly enter the second silicon steel sheet 12, in addition, the first silicon steel sheet 11 and the fourth silicon steel sheet 22 are in contact through the insulating film, the contact area of the first silicon steel sheet 11 and the fourth silicon steel sheet 22 is the same as the rectangular area of the corner, and in addition, the width of the insulating film is much smaller than the width of the gap, so the magnetic flux passes through downwards to enter the fourth silicon steel sheet 22, and in addition, because the second-level gap 23 exists between the third silicon steel sheet 21 and the fourth silicon steel sheet 22, the magnetic flux enters the second silicon steel sheet 12, thereby completing the magnetic flux loop. In the same way, the sequence of the magnetic flux in the second base layer is the third silicon steel sheet 21, the sixth silicon steel sheet 32 and the fourth silicon steel sheet 22.

The size of the magnetic flux in this embodiment is B, the components of the magnetic flux on the x axis and the y axis are Bx and By, respectively, after the seam form of this embodiment is adopted, the crossing area between each layer is 1/2 of the rectangular area of the corner, which is far larger than the crossing area of the conventional step lap width of several millimeters, so as to reduce the density of the leakage magnetic flux, also lengthen the path of the magnetic flux, and reduce the component By of the magnetic flux on the y axis during crossing, as shown in fig. 5, because the electromagnetic force P ═ B²The By reduces and also can make the electromagnetic force reduce, so under the unchangeable circumstances of total magnetic flux, magnetic leakage magnetic flux density reduces, and the eddy current size that its response produced also can reduce, and then the electromagnetic force that produces in the pile direction also can reduce, and the electromagnetic force reduces the back, also can make vibration amplitude between the silicon steel sheet lamination reduces thereupon, and the noise also can reduce thereupon to the function of making an uproar falls in the realization, falls to the transformer/reactor class product body and makes an uproar and play beneficial effect, and the overall structure of this embodiment is comparatively simple easily realizes using in addition.

Example 2:

this embodiment has demonstrated a power transformer, power transformer includes the iron core, the iron core is equipped with like embodiment 1 or other the same embodiments a reduce the structure of making an uproar that falls of iron core bight noise, adopt this embodiment the structure of making an uproar falls and can enlarge the regional area that the magnetic flux leaked the magnetic flux and pass through in bight to reduce the density of magnetic flux leakage, under the unchangeable condition of total magnetic flux, magnetic flux leakage density reduces, and the eddy current size that its response produced also can reduce, and then the electromagnetic force that produces in the pile-up direction also can reduce, and the electromagnetic force reduces the back, also can make vibration amplitude between the silicon steel sheet lamination reduces, and the noise also can reduce thereupon, thereby realizes making an uproar function of falling.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (7)

1. A noise reduction structure for reducing noise at the corner of an iron core, characterized in that it comprises a plurality of silicon steel sheets, the two silicon steel sheets are spliced to form a level, the two silicon steel sheets are vertically connected, and each level of the silicon steel sheet is vertically connected. There is a gap between the two silicon steel sheets in the middle, the three levels are stacked to form a group level, and the three levels are the first level, the second level and the third level in turn, and the There is an insulating film, the thickness of the insulating film is smaller than the slit, the plane where the slit of the first level is located is perpendicular to the length direction of one of the silicon steel sheets of the first level, and the plane of the slit of the second level is perpendicular to the length of the silicon steel sheet. The length directions of the two silicon steel sheets on the second level are both inclined, the plane where the slits on the third level are located is perpendicular to the length direction of one of the silicon steel sheets on the first level, and the slits on the first level are perpendicular to the length direction of one silicon steel sheet on the first level. The spacing between the slits of the level is equal to the spacing between the slits of the second level and the slits of the third level. 2 . The noise reduction structure for reducing noise at the corners of the iron core according to claim 1 , wherein the slits of the first level and the slits of the third level are respectively located at the gaps of the slits of the second level. 3 . sides. 3 . The noise reduction structure for reducing noise at the corner of the iron core according to claim 1 , wherein the included angle between the plane where the gap of the second level is located and the length direction of the two silicon steel sheets of the second level is equal to 3 . is 45°. 4 . The noise reduction structure for reducing noise at the corner of the iron core according to claim 1 , wherein the noise reduction structure comprises a plurality of group stages, and the plurality of group stages are stacked on each other. 5 . 5 . The noise reduction structure for reducing noise at the corner of the iron core according to claim 1 , wherein the gap of each level is 0.5-2 mm. 6 . 6 . The noise reduction structure for reducing noise at the corner of the iron core according to claim 1 , wherein the insulating film has a thickness of 2-4 microns. 7 . 7 . A power transformer, characterized in that: the power transformer comprises an iron core, and the iron core is provided with a noise reduction structure for reducing noise at the corner of the iron core according to any one of claims 1 to 6 .

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