Oil pump for electric locomotive transformer

Abstract

The invention relates to a pump for locomotive transformer, comprising shell and impeller, characterized in that the outer adopts the welding structure of steel plate and seamless steel pipe. The inner adopts all-closed structure of combination of three-phase asynchronous motor with oil-circulation cooling and cantilever centrifugal pump. Motor winding and bearing in pump motor adopts continuous cooling style that transformer oil flows into the front bearing from the back bearing through the oil return hole at the shaft center in the high-pressure oil region; and returns into the lower-pressure oil region of pump; and then it flows to the high-pressure oil region again.

Description

technical field [0001] The invention belongs to a component structure of a transformer, in particular to a cooling oil pump for a transformer, which is mainly used for cooling the main transformer of a railway high-speed electric locomotive. Background technique [0002] Transformer oil pumps are suitable for forced oil circulation cooling systems such as large and medium-sized power transformers, rectifier transformers, reactors, and traction transformers for electric locomotives. Transformer oil pump - is a fully sealed structure, built-in submersible three-phase asynchronous motor direct shaft drive a centrifugal or axial flow vane pump, dedicated to fluid machinery for transporting transformer insulating oil medium. The centrifugal transformer oil pump is suitable for the strong oil air cooler of the transformer; the axial flow transformer oil pump (low head, large flow) is suitable for the transformer radiator. [0003] Divided according to the structure of the driving...

AI Technical Summary

Problems solved by technology

The motor windings and bearings inside the oil pump motor use transformer oil to flow from the high-pressure oil area of ​​the oil pump, from the rear bearing to the front bearing through the oil return hole of the shaft center, and then flow back to the low-pressure oil area of ​​the oil pump, and then flow to the high-pressure oil area for continuous circulation cooling The structure solves the heat dissipation problem of the oil pump motor due to the reduced volume

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