PRECIPITATION TUBE FOR CENTRIFUGAL SEPARATION

摘要

The invention relates to a tool capable of extracting only a lower layer liquid without contamination from a two-phase liquid separated into an upper layer liquid and a lower layer liquid by means of centrifugal force. An internal tube is inserted in and fixed to a vessel body with its top opened. Upper and lower portions of a centrifugal separation chamber formed between inner peripheral surface of the vessel body and outer peripheral surface of the internal tube is communicated to an extraction chamber inside of the internal tube. A piston plug integrally formed with a seal cap for closing top opening of the vessel body is fitted and inserted into the internal tube. Communication between the upper and lower portions of the centrifugal separation chamber and the extraction chamber is interrupted when inserting the piston plug into the innermost area of the internal tube. Upper space of the centrifugal separation chamber and space on the lower end face side of the piston plug are communicated during the process of pulling out the piston plug from the internal tube. Further, the internal tube is inserted into the vessel body with its top opened, lower end opening of the internal tube is closed by a closure plug coming off by a downward pressure force and falling down in any one of forward, rearward, leftward and rightward directions when reaching the inner bottom face of the vessel body, and the centrifugal separation chamber formed between the inner peripheral surface of the vessel body and the outer peripheral surface of the internal tube is sealed by a cap. <IMAGE>