Axial fan
AssigneeViessmann Holding International GmbH
InventorsKonrad BAMBERGER, Andreas SCHUBERT
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Abstract
An axial fan has a nozzle and a rotatable impeller which has freely ending blades. The nozzle forms a main flow duct which connects an inflow side of the fan to an outflow side of the fan and defines a main flow direction as a result. The nozzle surrounds the impeller, wherein it does not corotate with the impeller. A bypass duct forms a flow connection from an outflow-side surrounding area of the nozzle into an inflow-side region of the main flow duct for the purpose of returning outflow-side air into the main flow duct of the nozzle. The axial fan reduces the noise emission and makes an extension of the breakaway-free operating range possible.
Claims14
An axial fan with a nozzle and with a rotatable impeller which has freely ending blades,
- wherein the nozzle forms a main flow duct which connects an inflow side of the fan to an outflow side of the fan and defines a main flow direction as a result,
- wherein the nozzle surrounds the impeller, and
- wherein the nozzle does not corotate with the impeller,
- wherein there is a bypass duct present which forms a flow connection from an outflow-side surrounding area of the nozzle into an inflow-side region of the main flow duct for the purpose of returning outflow-side air into the main flow duct of the nozzle.
Dependencies are inferred from the claim text.