| 摘要 |
A pump (12), with a rotor (13) having screw threads, hence a spiral pump (12) and/or a mono pump, are provided for feeding on a slow and/or air-pressure conveyor (1) for granular or powdered material. In order to form, at the exit from the pump, the surges of air pressure necessary for conveying as a result of the low flow rate of the fluid, at least one opening (5) is, for entry of part of the fluid, which is either fed separately or diverted from the conveying pipe (2), arranged next to the chamber outlet (26) in the conveying pipe (2) or in the region of the end of the chamber (11) itself. <IMAGE>
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