Fan drip-proof structure

A fan drip-proof structure comprising:

• a fan housing that accommodates an impeller which rotates about a first rotation axis line parallel to an upward-downward direction, wherein the fan housing includes a lower surface which is orthogonal to the first rotation axis line and on which a suction port is formed;
• a plurality of side surfaces which are parallel to the first rotation axis line and on which a blowing port is formed;
• at least one open-close member that opens and closes the blowing port in response to a wind force of an air flow of the fan;
• and
• a regulation member that regulates an open degree of the blowing port by the open-close member,
• wherein the open-close member opens and closes the blowing port by rotating about a second rotation axis line parallel to a direction that crosses the upward-downward direction of the fan housing corresponding to a vertical direction in response to the wind force,
• the regulation member is a rod body provided along the second rotation axis line,
• the open-close member in an open state is regulated by the regulation member such that the open-close member in the open state is in contact with the regulation member and does not rotate larger than a first angle required for ensuring a desired drip-proof performance,
• the regulation member permits rotation around the second rotation axis line of the open-close member without contacting the open-close member when an inclination angle of the open-close member relative to a downward direction in the upward-downward direction is less than the first angle ensuring the desired drip-proof performance, and
• the regulation member prohibits an increase of the inclination angle by contacting the open-close member when the inclination angle of the open-close member is the first angle ensuring the desired drip-proof performance.