| 主权项 |
1. A ventilator for use in air-conditioning and refrigeration technology, the ventilator comprising:
a one-part plastic housing comprising an inlet nozzle, cylinder-shaped flow guiding means, outlet guide vanes, and a diffusor, wherein the inlet nozzle, the cylinder-shaped flow guiding means, the outlet guide vanes, and the diffusor are together monolithically formed of plastic material; a drive motor arranged in the housing; an impeller wheel rotatably supported about a central axis in the housing and driven by the drive motor, wherein the outlet guide vanes are arranged downstream of the impeller wheel; a protective screen connected to the housing, wherein the protective screen is positioned downstream of the outlet guide vanes on the housing; a motor support connected by the outlet guide vanes to the housing; wherein the impeller wheel has vanes with radially outwardly positioned vane ends, wherein the vane ends are embodied as winglets; wherein the winglets are spaced at a minimal spacing relative to a sidewall of the housing and said minimal spacing minimizes efficiency losses and noise development; wherein the drive motor is an external rotor motor that is embodied either an as alternating current asynchronous motor (AC) or an electronically commutated direct current motor (EC); wherein the outlet guide vanes are curved multi-dimensionally and each have a leading edge and a trailing edge; wherein the leading edge is crescent-shaped and the trailing edge is serrated or has a wavy shape; wherein the crescent-shaped leading edge is arranged in a direction opposite to a rotational direction of the impeller wheel. |
