Sealing device

. A sealing device configured to seal a window portion formed in a side wall of a work pan that stores a working fluid in which a workpiece is immersed, wherein a lower arm that supports a wire electrode configured to machine the workpiece is inserted through the window portion and the window portion is formed so as to allow the work pan to move in an intersecting direction that intersects an extending direction of the inserted lower arm, the sealing device comprising:

• a seal base fixed to an outer surface of the work pan and including a through hole communicating with the window portion;
• a seal plate configured to close the through hole from an outer surface side of the seal base and provided so as to be movable relative to the seal base;
• a bellows member disposed on a side of an inward direction relative to the seal plate, so as to cover the window portion, the inward direction being a direction that extends from an outer side to an inner side of the window portion along the extending direction, the bellows member being configured to expand and contract along the intersecting direction;
• a flow path configured to allow the working fluid having a pressure higher than a pressure inside the work pan, to be supplied between the bellows member and the seal plate;
• and
• a support rod that penetrates through a lower portion of the bellows member in a state in which the bellows member is allowed to expand and contract, extends in the intersecting direction, and is configured to support the bellows member,
• wherein
• a gap through which the working fluid flows is formed between the bellows member and a lower portion of an inner peripheral surface of the seal base, the lower portion facing upward, and
• the lower portion is positioned further upward than a bottom surface of the work pan.