Axial fan rotor for reversible flow

An axial fan comprising:

• an axial fan rotor comprising:
• a central hub configured to rotate in a forward direction and in a reverse direction;
• and
• a plurality of fan blades attached to an outer circumference of the central hub, each of the fan blades including:
• a forward direction leading surface that is part of a forward direction leading portion;
• a forward direction trailing surface that is part of a forward direction trailing portion;
• a reverse direction leading surface that is part of a reverse direction leading portion;
• a reverse direction trailing surface that is part of a reverse direction trailing portion;
• and
• a center portion connecting the forward direction leading surface, the forward direction trailing surface, the reverse direction leading surface, and the reverse direction trailing surface,
• wherein:
• the forward direction leading surface and the forward direction trailing surface, are configured to force air towards a front or a rear of the central hub when the central hub is rotated in the forward direction;
• the reverse direction leading surface and the reverse direction trailing surface are configured to force air towards another of the front or the rear of the central hub when the central hub is rotated in the reverse direction;
• a distance between the forward direction leading surface and the reverse direction trailing surface increases as a distance from the center portion increases;
• and
• a distance between the reverse direction leading surface and the forward direction trailing surface increases as a distance from the center portion increases;
• a motor configured to rotate the axial fan rotor;
• and
• a housing with an internal cavity surrounding the axial fan rotor.

A fan blade comprising:

• a forward direction leading portion;
• a forward direction trailing portion;
• a reverse direction leading portion;
• a reverse direction trailing portion;
• and
• a center portion connecting the forward direction leading portion, the forward direction trailing portion, the reverse direction leading portion, and the reverse direction trailing portion,
• wherein:
• the forward direction leading portion and the forward direction trailing portion are configured to force air towards a front or a rear of the fan blade when the fan blade is rotated in a forward direction around an axis of rotation;
• the reverse direction leading portion and the reverse direction trailing portion are configured to force air towards another of the front or the rear of the fan blade when the fan blade is rotated in a reverse direction around the axis of rotation;
• the fan blade forms gaps between:
• the forward direction leading portion and the reverse direction trailing portion;
• and
• the forward direction trailing portion and the reverse direction leading portion;
• and
• the gaps increase as a distance from the center portion increases.