Inverter stack

An inverter stack, comprising:

• an inverter main body defined as a case housing an inverter circuit inside;
• and
• a fan block having a box shape, disposed on an upper portion of the inverter main body through an engagement device, and housing inside a plurality of fans for sending air to the inverter main body,
• wherein the engagement device includes
• a bolt member penetrating from a front side through a slot formed in a front surface of the upper portion of the inverter main body in which a left-right direction is a longitudinal direction, and being screwed into a nut fixed to a plate member in a condition where a body portion of the bolt member passing through the slot passes through a through hole, which is larger than the slot and formed in the plate member, and having a stopper nut fixed to a leading end portion, and
• an engagement hole formed in a lower front surface of the fan block, the engagement hole having an attachment hole portion having a diameter larger than an outer diameter of a head portion of the bolt member, and a clamping hole portion formed continuously from the attachment hole portion and having a diameter smaller than the outer diameter of the head portion of the bolt member,
• when the bolt member is tightened in a state in which the body portion of the bolt member is passed through the clamping hole portion of the engagement hole, the fan block is engaged with the inverter main body, and
• when a tightening force of the bolt member is released and the bolt member slides in the left-right direction relative to the engagement hole so that the body portion passes through the attachment hole portion of the engagement hole, the fan block is pulled out to the front side to be disengaged from the inverter main body.