Impellers 1 and 2 rotate about fixed axes B and A and each has three identical teeth d 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 teeth d of impellers 1 and 2. The impellers are driven by two meshing identical gears keyed on shafts with impellers 1 and 2.
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