| 摘要 |
A fluid pump having a housing with an inlet and an outlet, and provided with a pair of cam tracks in a side by side relationship. A vane carrying rotor is rotatably mounted within the cam tracks, a portion of the vanes carried by the rotor engaging one track and forming a first pumping means connected to the inlet of the device; the remaining vanes carried by the rotor engaging the other cam track to form a second pumping means connected intermediate the first pumping means and the outlet of the device, whereby a single flow path is defined through both pumping means of the device. A pressure regulator is connected intermediate the pumping means and takes the form of an aneroid operable to maintain a constant pressure at the inlet of the second pumping means and to open at a predetermined pressure value to return a portion of the fluid to the inlet of the device.
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