Assembly method and structure of a transformer body

Abstract

The invention discloses an assembly method for a transformer body. The assembly method comprises the following steps that support tools are uniformly arranged on an iron core; a coil assembly sleeves the iron core or is winded on the iron core, and is tightly tied and fixed; heat expansion glass fiber felt with a proper thickness is placed into non-volatile insulation paint to be soaked for obtaining a composition; the composition of the heat expansion glass fiber felt and the non-volatile insulation paint are inserted into a gap formed between the iron core and the coil assembly; the assembly is completed after the composition of the heat expansion glass fiber felt and the non-volatile insulation paint are completely dried and cured. The assembly method has the advantages that an original support strip beating assembly mode can be replaced, the operation work intensity is reduced, in addition, the iron core and the coil can be effectively combined into a whole, and the short-circuit-impact-resistant capability of a coil of a three-dimensional stereo wound core transformer and a traditional laminated transformer can be effectively improved. The structure of the transformer body meets the fastening requirements of a stereo wound core on the iron core and the coil.

Description

technical field [0001] The present invention relates to a method for assembling a transformer body and a transformer body structure, in particular to a method for assembling a transformer body using heat-expandable glass fiber felt and non-volatile insulating varnish and the transformer body structure assembled by the method , belonging to the field of transformers. Background technique [0002] Iron core and coil are important core components of transformers, and their performance directly determines the performance of transformer products. However, during the transportation or operation of the transformer, the iron core and coil are prone to loosening. In order to ensure the safety and reliability of transformer products, the iron core and coil It must be completely fastened and reliable without relative looseness. In the traditional transformer body structure, most of them use insulating stays inserted in the gap between the iron core and the coil. The disadvantage of thi...

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Problems solved by technology

The particularity of the wound core structure makes the iron yoke and the core column connected together so that the gap between the core column and the coil at the lower part of the iron yoke cannot be inserted into the stay. The particularity of the amorphous alloy itself cannot be compressed by the stay. Therefore, the traditional transformer body structure cannot meet the requirements and needs to be further improved and optimized

[0003] In addition, between the inner side of the coil paper tube and the iron core post, a stay or an iron core post plus a surrounding plate is inserted into the coil to effectively fix the coil. In such an assembly process, since the gap between the inner side of the coil and the iron core is a theoretical However, the flatness and roundness of the surface of the core column objectively have a certain process error in the production process, plus the shrinkage of the cardboard after drying, whether it is using the shroud process or the stay bar process, in fact, the low pressure after drying It is impossible to achieve the ideal fixing effect between the coil and the core

At the same time, due to the irregularity of the gap, it is more difficult to drive in the narrower position of the stay in the process of setting the stay, and it often happens that the stay is not completely driven into the predetermined position and the stay is forced to break; for loose position, you need to stack a certain amount of cardboard to meet the tight requirements

Such a process structure, on the one hand, will consume a long time and a large labor intensity when assembling the device body; To achieve complete contact, there may be only a few points of contact, so that the coil and the core are not actually fixed effectively, resulting in poor short-circuit resistance of the transformer product during operation

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