Importance

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Abstract

A multistage hydraulic machine which includes a housing, a main shaft mounted in the housing, a high-pressure stage and low-pressure stage runner firmly secured to the main shaft wherein the housing has formed therein a plurality of runner chambers enclosing each of the runners, respectively, of the high-pressure and the low-pressure stage, a return passage communicating with the runner chambers of the high-pressure and low-pressure stages, a high-pressure stage, outer back chamber, a high-pressure stage, inner back chamber and a high-pressure stage, side chamber all of which are located within the runner chamber enclosing the high-pressure stage runner, a low-pressure stage, side pressure chamber located within the runner chamber enclosing the low-pressure stage runner, a mechanism for communicating the high-pressure stage, inner back chamber with the return passage, and a mechanism for respectively communicating the low-pressure stage, side pressure chamber with the return passage.

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First Claim