JET PUMP, AND BOILING WATER REACTOR HAVING A JET PUMP OF THIS TYPE

摘要

The invention relates to a jet pump (18) having a mixing chamber tube (26) and having a diffuser tube (28), wherein the mixing chamber tube (26) is plugged into the diffuser tube (28) on the end side in the manner of a nested arrangement and is mounted slidingly therein, with the result that, in an overlapping region (44), the diffuser tube (28) encloses the mixing chamber tube (26) with the formation of a substantially annular leakage gap (42). Measures are to be realized for avoiding leakage-induced vibrations and jolts in a jet pump (18) of this type, which measures manage without additional mechanical components, are easy to retrofit and eliminate the cause of the problem as far as possible. To this end, it is provided according to the invention that a number of passage openings (54) and/or edge recesses (64) are made in the tube wall (56) of the diffuser tube (28) within the overlapping region (44) and/or in the immediate vicinity thereof, the shape and position of which passage openings (54) and/or edge recesses (64) are selected in such a way that the leakage flow (48) which is produced during operation of the jet pump (18) generates a resulting force which deflects the mixing chamber tube (26) relative to the diffuser tube (28) in a temporally constant direction with regard to the circumference.