Two identical impellers, 1 and 2, rotate about fixed axes A and B and have the shape of semidisks d with recesses e whose profile is made up of portions of cycle curves. When impellers 1 and 2 rotate, fluid is delivered continuously in the direction of arrows a and b. The suction and discharge chambers are separated by imparting a special profile to recesses e. The impellers are driven by two meshing identical gears keyed on shafts with impellers 1 and 2.
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