Patent ID: 9683579
Date: 2017-06-20
CPC Classifications: F04D

Claim:
1. A circulator comprising: a main body that is cylindrical, in which a discharge port is formed at one end thereof, a suction port is formed at the other end thereof, and an air passage extending from the suction port to the discharge port is formed in the inside thereof; a grill unit having a wall facing radially outward, the wall being provided annularly along an inner periphery of the air passage and locally narrowing the air passage, and the wall including a cylinder-shaped straight cylindrical portion that is provided at a part of the wall where the air passage is narrowed farthest and that extends straightly in an axial-line direction, a bell-mouthed curved portion that is provided on a side of the suction port of the straight cylindrical portion, and a conical tapered portion that is provided on a side of the discharge port of the straight cylindrical portion; an impeller that is located in a part of the air passage having been narrowed by the wall; a motor that is connected to the impeller and rotates the impeller to discharge air having been sucked from the suction port out of the discharge port; and an electrical-component housing unit, wherein the main body includes the motor in a central portion, the electrical-component housing unit is disposed in the main body while being situated on a center axial line of the main body and behind the motor so as to be farther from the discharge port than the motor, and the grill unit includes a grill provided to cover the discharge port, and is configured so that when the grill unit is attached to the main body, the wall is fitted in the main body by sliding to an inner side of an opening of the main body serving as a guide so that a protrusion of the wall extending from the conical tapered portion toward the discharge port abuts against an inner surface of the main body, and an outer peripheral end of the grill comes in butt-contact with an edge of the opening on a side of the discharge port of the main body in the axial-line direction.