Double-stage inner gearing rolling sleeve pump

The present invention is engaged with the rollers of a two-stage pump, the pump comprising a pump cover frame and secured, characterized in that: the large gear disposed within the pump frame, and the pinion gears, the gear has the gear plate, the gear plate by hinge pin fixedly connected with a plurality of sets of rollers, the rollers of the gears in mesh with the large gear, the tooth surfaces of the pinion, respectively, the large gear pump is placed on the back cover of the camshaft, the gears in the gear plate with the motor shaft is fixedly connected to the outer end of the gears in the gear plate by a mechanical seal disposed within the pump rack, a pinion fixed on a hinged rear pinion gear pump pin; or partition is provided in the pump cover the suction and discharge chambers a spacer, a large gear tooth surfaces, gears and the rollers of each spacer block motion sealing engagement. Small size, light weight, high rpm, flow rate, low noise, simple structure, versatility, ease of manufacture and low cost.