Patent ID: 8172554

Claim:
A chemical liquid supplying apparatus comprising: a pump housing provided with a liquid inlet and a liquid outlet; a flexible tube incorporated into the pump housing, partitioning a pump chamber communicating with the liquid inlet and outlet, and partitioning a drive chamber in which an incompressible, indirect medium is enclosed between the flexible tube and the pump housing; driving means provided to the pump housing, and expanding and contracting the pump chamber via the incompressible, indirect medium; an outer seal member disposed in an inner surface of the pump housing so as to correspond to an end portion of the flexible tube; a fastening cylindrical body, outside which an inner seal member is provided and which is disposed in the end portion of the flexible tube; and a wedge sleeve inserted inside the fastening cylindrical body from an opening end of the pump housing under the condition that the flexible tube is incorporated into the pump housing and that the fastening cylindrical body is incorporated into the end portion of the flexible tube, the wedge sleeve causing the fastening cylindrical body to be expanded toward the inner surface of the pump housing, and causing the inner and outer seal members to closely contact with the flexible tube.