CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims priority from Japanese patent application 2018-209310 filed on Nov. 7, 2018, the entirety of the content of which is hereby incorporated by reference into this application.

BACKGROUND

Field

The present disclosure relates to a fuel cell system and a fuel cell vehicle.

Related Art

A compressor configured to compress a gas is widely used in a fuel cell system with a view to supplying the air as an oxidizing gas to a cathode. A known compressor includes a motor, a rotating shaft driven by the motor and an impeller mounted to the rotating shaft and is configured to circulate oil used for lubricating and cooling down respective parts, in a closed space provided with the motor and other driving portions (see Patent Literature 1, for example).

Patent Literature 1: JP 2008-144724A

The compressor during operation generates heat in the closed space provided with the motor and the other driving portions. A pressure increase in this closed space accompanied with such heat generation has a possibility of oil leakage from this closed space to a compression chamber provided with an impeller placed therein to compress the air. Such oil leakage may cause oil to be mixed in with the air that is to be supplied from the compressor to the fuel cell and may thus cause a trouble.

SUMMARY

According to one aspect of the present disclosure, there is provided a fuel cell system. This fuel cell system comprises a fuel cell; a compressor configured to compress the air and feed the compressed air to a cathode of the fuel cell; a cooling medium piping arranged such that a cooling medium flows through therein to cool down the fuel cell; and a depressurization pipe including a first end portion, a second end portion, and a rising portion that is extended vertically upward, the depressurization pipe being configured such that the first end portion is connected with the compressor and that the second end portion is open to the atmosphere. The compressor comprises a compression chamber configured to compress the air by a rotating body; and a drive chamber arranged to separate from the compression chamber, provided with a driving mechanism that is placed therein to drive the rotating body, configured such that oil flows through therein, and placed to communicate with the first end portion of the depressurization pipe. When being viewed in a direction opposed to one side face of the fuel cell, the depressurization pipe and the cooling medium piping are arranged to intersect with each other on the one side face.

