Amorphous alloy core and amorphous alloy transformer

Abstract

The present invention discloses an amorphous alloy core and an amorphous alloy transformer to adapt to external stress and effectively reduce noise variation. The amorphous alloy core includes a substrate formed by multiple layers of amorphous alloy strips, and an oil film of predetermined thickness is provided between adjacent amorphous alloy strip layers. The thickness of the oil film is preferably less than 10 μm. When the present solution is applied, when subjected to external stress, the noise variation of the amorphous alloy core with an oil film of predetermined thickness is significantly reduced, and a better noise reduction effect is achieved, thereby providing technical guarantee for the wide application of the amorphous alloy core and giving full play to its excellent energy saving and economy.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to an amorphous alloy iron core and an amorphous alloy transformer. Background Art

[0002] With the rapid development of industrial technology, the importance of energy conservation and emission reduction has become increasingly prominent. Compared with silicon steel transformers, amorphous alloy transformers are both energy-saving and economical, in line with national industrial policies and the requirements of energy conservation and consumption reduction of power grids, and are widely used due to their low no-load loss.

[0003] As we all know, amorphous soft magnetic alloy materials have the advantages of both silicon steel and soft magnetic ferrite, with high saturation magnetic induction intensity and extremely low iron loss. They can be widely used in the core materials of various medium and high frequency power electronic equipment, which can effectively reduce the size of the device and reduce the energy consumption of the equipment. In particular, the use of amorphous material cores in transformers has a significant energy-saving effect. The no-load loss of amorphous transformers of the same capacity is only one-fourth of that of silicon steel transformers. At present, amorphous transformers and other devices are widely needed in engineering applications. For example, in wind power and solar power grid-connected equipment, inverters and converters are indispensable equipment, and the main devices include transformers, filter inductors, etc. Based on the advantages of low cost, low loss, and small temperature coefficient of amorphous cores, it has great market prospects for replacing silicon steel sheet cores in inverter power supplies.

[0004] Amorphous material is a new material manufactured using rapid solidification technology. Several layers of amorphous material strips are wound or stacked and extruded to form an amorphous iron core. The laminated structure is relatively loose, which makes it easy to generate vibration and noise. At the same time, the magnetostriction degree of amorphous alloy is relatively high, which is also one of the factors that cause the iron core wound with it to be noisy.

[0005] The existing amorphous material core generally adopts the method of brushing epoxy resin on the surface of the core to reduce noise. The brushing speed is slow, the surface is not easy to be flat, and the coating thickness has the defects of unevenness. In addition, when the resin filling between the amorphous material strips is not dense enough, the amorphous material strips are easy to loosen. In the above situation, the core is prone to vibration when subjected to a certain external force, and the noise changes greatly.

[0006] In view of this, it is urgent to find another way to optimize the design of the existing amorphous alloy core to overcome the above defects. Summary of the invention

[0007] In order to solve the above technical problems, the present invention provides an amorphous alloy core and an amorphous alloy transformer to adapt to external stress and effectively reduce the noise variation.

[0008] The amorphous alloy iron core provided by the present invention comprises a substrate formed by multiple layers of amorphous alloy strips, and is characterized in that an oil film of a predetermined thickness is provided between adjacent amorphous alloy strip layers.

[0009] Preferably, the oil film thickness is less than 10 μm.

[0010] Preferably, the oil film is formed by using mineral oil.

[0011] Preferably, the mineral oil is a mineral oil containing alkanes, cycloalkane saturated hydrocarbons or aromatic unsaturated hydrocarbons as main components.

[0012] Preferably, the oil film is formed by vacuum encapsulation or coating.

[0013] Preferably, an oil channel is provided on the assembly surface of the iron core.

[0014] Preferably, the area of ​​the oil passage is less than 60% of the area of ​​the assembly surface.

[0015] The present invention also provides an amorphous alloy transformer, comprising the amorphous alloy core as described above.

[0016] Preferably, the surface of the amorphous alloy strip layer located outside the iron core has an oil film of a predetermined thickness.

[0017] In view of the noise problem caused by the characteristics of existing amorphous material strips, the present invention innovatively proposes a noise reduction scheme for amorphous alloy cores, specifically, there is an oil film of predetermined thickness between adjacent amorphous alloy material strip layers, that is, an oil film is added between the layers of the amorphous alloy core material strip. With such a configuration, when subjected to external stress, the oil film with predetermined thickness and the oil channel design significantly reduce the noise variation of the amorphous alloy core. After trial production and testing, the noise variation can be controlled within 3dB to 7dB, with a better noise reduction effect. Therefore, it provides technical guarantee for the wide application of amorphous alloy cores and gives full play to their excellent energy saving and economy.

[0018] In a preferred embodiment of the present invention, an oil channel is added to the assembly surface of the amorphous alloy core. The oil film with a predetermined thickness and the oil channel design can also reduce the generation of fragments of the amorphous alloy core during vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the material strip interlayer structure of the amorphous alloy core described in the specific implementation method;

[0020] Figure 2a , Figure 2b , Figure 2c , Figure 2d Schematic diagrams of oil channel structures in different forms are shown respectively.

[0021] In the figure:

[0022] Amorphous alloy strip 1, oil film 2, oil channel 3. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Without loss of generality, this embodiment is based on Figure 1 The interlayer structure of the amorphous alloy core shown in the figure is used as the basic description subject, and the technical solution of the amorphous alloy core in which the noise variation is effectively controlled is described in detail. It should be understood that the number of layers of the amorphous alloy three-dimensional rolled core is not the core invention point of this application and does not constitute a limitation on the core solution of this application.

[0025] See also Figure 1 , which is a schematic diagram of the interlayer structure of the material strip of the amorphous alloy core described in this embodiment.

[0026] The matrix of the amorphous alloy three-dimensional wound core is formed by multiple layers of amorphous alloy strips 1. As shown in the figure, there is an oil film 2 of a predetermined thickness between adjacent layers of amorphous alloy strips 1. An oil film is added between the layers of the amorphous alloy core strips. When subjected to external stress, the oil film 2 with a predetermined thickness plays a good buffering role for the collision between the layers of the amorphous alloy strips 1, thereby significantly reducing the noise variation of the amorphous alloy core.

[0027] In order to effectively balance the core performance and noise control, the thickness of the oil film 2 is preferably less than 10 μm, and the filling thickness of the oil film 2 can be selected according to the extreme difference of the amorphous alloy strip. The test results of the production trial show that the noise change of the amorphous alloy core can be controlled within 3dB to 7dB without affecting the working performance of the core. As a further preference, the oil film is formed by a mineral oil with alkanes, cycloalkane saturated hydrocarbons or aromatic unsaturated hydrocarbons as the main components. The main component here is also the main component of the base oil of the mineral oil.

[0028] Furthermore, the filling method of the oil film 2 can adopt at least the following two methods. One is to pump mineral oil into the gaps between the layers of the amorphous alloy strip 1 under a vacuum environment to form the oil film 2. The other is to infiltrate the oil film into the gaps between the layers of the amorphous alloy strip 1 under a natural environment to form the oil film 2. Both of the above methods need to ensure that the oil film 2 can evenly fill the gaps of the amorphous alloy strip 1.

[0029] In addition, in order to ensure that the amorphous alloy core reduces the generation of fragments during vibration, an oil channel 3 can be added to the assembly surface of the amorphous alloy core. The oil channel 3 can be set at any position on the assembly surface of the amorphous alloy core, and the shape of the oil channel can be a regular strip or an irregular shape. In addition, the number of oil channels 3 on the assembly surface of the amorphous alloy core can be set according to the specific product, as long as the above functional requirements are met, they are within the scope of protection requested in this application.

[0030] As a preference, the area occupied by the oil passage 3 is less than 60% of the area of ​​the assembly surface, thereby meeting the requirements of both the strength of the splicing connection and the reduction of the generation of debris. Figure 2a , Figure 2b , Figure 2c , Figure 2d , which show the structural schematic diagrams of four oil channel designs respectively.

[0031] Specifically, the formation of the oil channel 3 on the core joint surface can be achieved in different ways. For example, but not limited to, the three-dimensional coiled core can be formed on the inside and outside of the joint surface by gluing, and the glue is applied on the core assembly surface, and then it is flattened with a scraper and then bonded. The glue layer does not need to be uniform, and it is sufficient to ensure that the core is firmly bonded, so that a permeable irregular oil channel can be formed; or, before gluing, the assembly surface is covered with a plastic film strip (consistent with the shape of the oil channel), and then the glue is applied. After the gluing is completed, the film strip is torn off to form an area without glue coverage. The oil channel of the corresponding shape will also be left during assembly and bonding. The regular rectangular oil channel can better promote the mineral oil to better penetrate into the gap of the glue layer on the joint surface.

[0032] It should be noted that the matrix forming method of the amorphous alloy core is not the core invention of the present application. It can be formed by winding an amorphous material strip according to specific product design requirements, so it will not be elaborated in this article.

[0033] In addition to the aforementioned amorphous alloy core, this embodiment also provides an amorphous alloy transformer having the core. Here, other functional components of the transformer are not the core invention of this application, and those skilled in the art can select them based on the overall technical requirements of the transformer, so they will not be described in detail herein.

[0034] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An amorphous alloy core, comprising a substrate formed by multiple layers of amorphous alloy strips, characterized in that: An oil film of predetermined thickness is provided between adjacent amorphous alloy strip layers to reduce the noise variation of the amorphous alloy core, the thickness of the oil film is less than 10 μm, an oil channel is provided on the assembly surface of the core, and the area of ​​the oil channel is less than 60% of the area of ​​the assembly surface.

2. The amorphous alloy core according to claim 1, characterized in that: The oil film is formed by using mineral oil.

3. The amorphous alloy core according to claim 2, characterized in that: The mineral oil is specifically a mineral oil containing alkanes, cycloalkane saturated hydrocarbons or aromatic unsaturated hydrocarbons as main components.

4. The amorphous alloy core according to claim 1, characterized in that: The oil film is formed by vacuum encapsulation or coating.

5. An amorphous alloy transformer, comprising an iron core, characterized in that: The iron core is specifically the amorphous alloy iron core according to any one of claims 1 to 4.

6. The amorphous alloy transformer according to claim 5, characterized in that: The surface of the amorphous alloy strip layer located outside the iron core has an oil film of a predetermined thickness.

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