| 摘要 |
<p>The annular groove (20) intended to seal the rotor (14) of the device and which extends about a fuel feed spindle (8) is connected by means of a roller bearing (7) to a pressure chamber (40) for sucked air. When the rotor (14) is driven by the vane wheel (31, 38), the dynamic pressure exerted in the annular slot is opposed to the leak pressure. By adapting the opening of the pressure chamber (40), the dynamic pressure is adjusted to a value equal to or slightly exceeding the leak pressure so that the fuel cannot escape through the annular slot (20). In order to enrich the fuel-air mixture for higher loads, an opening of the pressure chamber (40) is selected such that the dynamic pressure is smaller than the leak pressure at higher corresponding numbers of revolutions of the rotor (14) so that the latter supplies additional fuel. An aeration conduit (42) connects the pressure chamber (40) with the annular chamber (33) which takes the fuel from its inlet port (16) to a spraying ring (35) arranged under the vanes (38). Such aeration allows to obtain a continuous fuel flow in the annular chamber (33). This injection device provides a fuel-air mixture wherein noxious substances of exhaust gas are under limit values, without occurrence of peaks of the upper limit values.</p> |
