| 摘要 |
A vacuum nozzle 2 for a vacuum pump or truck, the vacuum nozzle 2 comprises a vacuum conduit 4 configured to be connected to a vacuum source, a primary inlet 14 fluidically connected to the vacuum conduit 4 for receiving flow under suction and a secondary inlet 16a, 16b fluidically connected to the vacuum conduit 4 for receiving flow under suction, the secondary inlet 16a, 16b being positioned upstream of the primary inlet 14 so as to allow flow to bypass the primary inlet 14, thereby preventing the primary inlet 14 from sealing against a surface under suction. The secondary inlets 16a, 16b may be formed as a passage which extends towards the primary inlet 14 and removable poles preferably extend across the cleaning head adjacent the vacuum conduit 4. The arrangement is used for cleaner tanks such as a wastewater treatment tank. |
