Liquid cooling type power conversion apparatus and railway vehicle

A liquid cooling type power conversion apparatus, comprising:

• a chassis opening portion with an opening portion which is provided in a railway vehicle;
• a chassis sealed portion which is sealed and is provided in the railway vehicle;
• a cooling apparatus installed in the chassis opening portion;
• a third heat exchanger located between an electric blower and an electric component in the chassis sealed portion;
• a cooling body on which a plurality of semiconductor devices are mounted in the chassis sealed portion;
• a first heat exchanger provided in the cooling apparatus;
• a second heat exchanger provided in the cooling apparatus having a size smaller than the first heat exchanger;
• a piping for the third heat exchanger to connect the third heat exchanger and the second heat exchanger;
• and
• a piping for a cooling body to connect the cooling body and the first heat exchanger.

A railway vehicle, comprising:

• a power conversion apparatus provided in an engine room to convert power supplied from an overhead line;
• an electric component and a semiconductor device which are provided in the power conversion apparatus;
• a third heat exchanger arranged in the power conversion apparatus for cooling the electric component;
• a cooling body for cooling the semiconductor device;
• a cooling apparatus to cool a medium for cooling an inside of the power conversion apparatus provided in the engine room;
• a first heat exchanger which is provided in the cooling apparatus and is connected to the cooling body;
• a second heat exchanger which is provided in the cooling apparatus and is connected to the third heat exchanger, and has a size smaller than the first heat exchanger;
• and
• a motor which is driven by the power converted by the power conversion apparatus.