<p>Circulating displacing machine comprises a housing (1) with a working chamber containing conveying toothed wheels (4, 5) with external teeth. The toothed wheels form a first combing region (6) to transport an operating fluid between a high pressure zone (I) and a low pressure zone (II) of the working chamber. A working toothed wheel (3) is connected to a shaft (31) forming a second combing region (7). A first channel (21) for the operating fluid in the first combing region opens into the high pressure zone of the operating chamber. Preferred Features: The working toothed wheel is sealed with a side wall (26) of the operating chamber over a part of its periphery and the operating chamber and a second channel (22) are sealed from each other.</p>
