Blower

A blower configured to suck a first fluid and a second fluid separately at a same time, the blower comprising:

• a fluid introducing box defining a first inlet through which the first fluid is introduced and a second inlet through which the second fluid is introduced;
• a fan configured to suck at least one of the first fluid or the second fluid in an axial direction of the fan and blow the at least one of the first fluid or the second fluid in a radial direction of the fan by rotating about a fan axis;
• a casing housing the fan;
• a tubular portion having a part disposed inside the fan and configured to introduce the first fluid and the second fluid separately into the fan;
• and
• an upper end portion connected to one end of the tubular portion in the axial direction and defining an air inlet for introducing at least one of the first fluid or the second fluid into the tubular portion, wherein
• the casing has a suction port forming portion at one end of the casing in the axial direction, the suction port forming portion defining a suction port for introducing at least one of the first fluid or the second fluid into the fan,
• the upper end portion is disposed at a position between the suction port forming portion and the fluid introducing box to overlap with both of a part of the suction port and a part of the suction port forming portion in the axial direction,
• a gap passage is defined between the upper end portion and the suction port forming portion and the gap passage includes a passage inlet,
• at least one of the first fluid or the second fluid is introduced into the gap passage from the passage inlet and fluids through the gap passage toward a downstream portion of the gap passage that is away from the passage inlet, and
• a distance between the upper end portion and the suction port forming portion in the axial direction at the downstream portion is less than that at the passage inlet.