Patent ID: 11955876
Assignee: MIDEA WELLING MOTOR TECHNOLOGY (SHANGHAI) CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  H | IPC H

Claim 0:
1. A fan comprising:
a driving structure;
an impeller, comprising a cover plate installed on the driving structure, the cover plate being recessed in an axial direction of the impeller, and a diameter of the cover plate gradually increasing along an air inlet direction;
a wind hood, being covered on the impeller, and comprising an air inlet and an air outlet communicated to the air inlet; and
a diffuser, being located at one end of the impeller facing the air outlet, and the diffuser comprising:
a first protrusion connected to the driving structure, the first protrusion protruding in a direction of the wind hood, wherein a diameter of one end of the first protrusion adjacent to the cover plate is smaller than a diameter of another end of the first protrusion away from the cover plate, and
an inner ring arm connected to the first protrusion and an outer ring arm sleeved outside the inner ring arm, wherein the outer ring arm is smoothly and transitionally connected to the wind hood, and wherein the first protrusion, the inner ring arm, and the outer ring arm are coaxial,

wherein:
the wind hood, the cover plate, and the diffuser defines a wind tunnel, and
the wind tunnel comprises a variable section portion and an equal section portion, the variable section portion is arranged adjacent to the air inlet, and the equal section portion is arranged adjacent to the air outlet, and

wherein the diffuser further comprises:
a first blade, being arranged between the inner ring arm and the outer ring arm, and both ends of the first blade along a radial direction of the diffuser are respectively being attached to the inner ring arm and the outer ring arm, so that the first blade, the inner ring arm and the outer ring arm define an air guiding cavity,
wherein the first blade is in a spiral shape, the first blade comprises an inlet end and an outlet end along the air inlet direction, and the inlet end is located behind the outlet end along a rotation direction of the impeller.