PURPOSE: To change the pitch and form of a blower by means of ambient temperature as well as to facilitate the extent of control over an air blasting quantity by sticking a material, different in a linear expansion coefficient each, solidly to a full or partial part of blades for this fan with one sheets or plural pieces of blades.
CONSTITUTION: A blower 2 is made up of cladding or sticking a material 5 different in a linear expansion coefficient with the substrate material 4 to the peripheral edge of a blade. A pitch of the blower is being set so as to let the blower come to 0 or optimum air quantity at an optimum temperature atmosphere of service equipment in advance, whereby the pitch of the blower can be made variable by means of a linear expansion difference in these materials 4, 5 in relation to a temperature change in the service equipment. A variation in the pitch of the blower grows larger as it follows the temperature difference, and it comes to a negative pitch in case of less than the setting temperature, so that it is able so as to perform even air intake, too.
KOSAKA HIROYUKI
SUZUMURA TAKASHI
