| 摘要 |
Pumping ejector having a fixed tubular ejector body passing through the wall of a protective cell. In its part which projects into the cell this body has an extension provided with a first lateral connection for the admission of a pumping steam flow, a second lateral connection connected to a pipe for admitting a fluid to be pumped and an axial diffuser for the outflow of said fluid shaped in convergent-divergent manner and fitted into the body behind the diffuser. It also comprises a tube having an intake opening for the steam flow introduced into the body by the first connection and has at its end facing the diffuser a nozzle for accelerating the steam for the entrainment of the fluid to be pumped. The tube carrying the nozzle at the opposite end to the diffuser is extended up to the outside of the wall of the cell by a shaft associated with means controlling its displacement in the body in order to vary the relative position of the nozzle up to an end position where the tube abuts against the diffuser blocking the outflow of the fluid to be pumped. Downstream of the first connection with respect to the outflow direction of the steam in the tube the ejector body has a third lateral connection for the independent admission of a separate steam flow. A particular application is in nuclear installations for the transportation of radioactive fluids.
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