Vacuum filling and sealing process of transformer polyurethane glue

Abstract

The invention belongs to the technical field of transformer manufacturing and application, and particularly discloses a transformer polyurethane glue vacuum filling and sealing process which comprises the following steps: step 1, glue preheating; step 2, vacuum stirring and defoaming of the glue; 3, statically mixing the glue A and the glue B; step 4, potting and injecting glue 1; step 5, potting and injecting glue 2; step 6, potting and injecting glue 3; step 7, normal-pressure desorption; and step 8, hot air purging. Compared with the prior art, the glue mixing device has the beneficial effects that glue is preheated before being mixed, the flowing property of the glue is better, bubbles of a transformer coil can be rapidly discharged, and the phenomena that the glue overflows and transformer pins are contaminated due to the fact that the flowing speed of the glue is low are effectively prevented; 2, the glue injection is mainly divided into three steps, so that the glue can infiltrate the transformer coil step by step, no air hole is formed in the coil formed by curing the glue after the transformer is encapsulated, the quality of the product is improved, and the risk of poor insulation and voltage resistance is avoided; and 3, the cured finished product is attractive in appearance and stable in performance.

Description

technical field [0001] The invention belongs to the technical field of transformer production and application, and in particular relates to a vacuum potting process of polyurethane glue for transformers. Background technique [0002] Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components are primary coil, secondary coil and iron core (magnetic core). The fundamental purpose of the existence of the transformer is to ensure the safety of people. The main function of the transformer is to step down and isolate. The step-down is to reduce the high voltage (such as 220V mains) to a safe voltage. , Transformers on the market can be divided into naked and sealed. The silicon steel sheet of the bare transformer is exposed, and the wire package is only covered with two layers of tape. It is difficult to ensure the insulation between the primary and secondary, and the shell is exposed. It is easy to cause electric shock ...

AI Technical Summary

Problems solved by technology

The fundamental purpose of the existence of the transformer is to ensure the safety of people. The main function of the transformer is to step down and isolate. The step-down is to reduce the high voltage (such as 220V mains) to a safe voltage. , Transformers on the market can be divided into naked and sealed. The silicon steel sheet of the bare transformer is exposed, and the wire package is only covered with two layers of tape. It is difficult to ensure the insulation between the primary and secondary, and the shell is exposed. Easy to cause electric shock accidents