Patent ID: 8087910

Claim:
A chemical liquid supplying apparatus for expanding a pump chamber to suck chemical liquid into the pump chamber and contracting the pump chamber to discharge the chemical liquid to an exterior of the pump chamber, the apparatus comprising: a bellows including a small-size bellows portion, a large-size bellows portion with a larger volume change per axial-directional unit displacement amount than that of the small-size bellows portion, and a drive portion provided between the small-size bellows portion and the large-size bellows portion, the bellows being deformed axially elastically to expand/contract the pump chamber; an apparatus main body including an inflow-side supporting member for attaching an inflow-side fixed end portion of the bellows and an outflow-side supporting member for attaching an outflow-side fixed end portion of the bellows; a drive sleeve surrounding the bellows and supported rotatably on the apparatus main body; a driven cylinder body attached to the drive portion to convert rotation movement of the drive sleeve to axial-directional movement of the drive portion; and drive means for rotating the drive sleeve.