Abstract: An adjustable stand fan includes a fan casing, a switch box, a lifting pipe, and a large chassis. The fan casing is fixed with an adjusting seat and is installed on the switch box through bolts. The switch box is mounted on a top of the lifting pipe that is vertically installed on a top of the large chassis. The lifting pipe includes a fixed end. External threads are on a bottom of the fixed end of the lifting pipe. A threaded hole matched with the fixed end of the lifting pipe is on a top center of the large chassis. A pitch angle adjusting mechanism is disposed in a joint between the adjusting seat and the switch box.

Abstract: The present invention discloses a multiple shaking-head structure for a fan, comprising a front part of the fan, a shaking-head upper cover, a synchronous motor, a gear stand and a fixed frame, wherein the front part of the fan consists of a motor front cover, a motor and a motor rear cover; a first elastic clamp which has a first dentation structure is positioned on the motor rear cover; first springs and a first ball tack are positioned in the shaking-head upper cover, wherein the first ball tack is matched with the first dentation structure; the synchronous motor is positioned on a synchronous motor support, and a driving gear is fixed on the synchronous motor; a circle of annular gear is positioned in a disc above the gear stand, and the driving gear is engaged with the annular gear of the gear stand; a second elastic clamp is positioned below the disc of the gear stand and has a second dentation structure; and a second spring and a second ball tack are positioned on the side surface of the fixed frame, w

Abstract: The invention discloses a fan housing with encircling rings, comprising a front housing and a rear housing, wherein the front and rear housings are respectively provided with a circular encircling ring which is used for mutual fixing; multiple protruding ends are provided on the inner wall of the front encircling ring, while multiple slots are correspondingly provided on the outer wall of the rear encircling ring, so that the front and rear housings can be fastened together through match of the protruding ends and the slots; the front housing is provided with a handling cover; a fixing device, which comprises a draw bar, a spring and a pressing plate, is provided at one slot of the rear encircling ring.

Abstract: The invention discloses a fan housing with encircling rings, comprising a front housing and a rear housing, wherein the front and rear housings are respectively provided with a circular encircling ring which is used for mutual fixing; multiple protruding ends are provided on the inner wall of the front encircling ring, while multiple slots are correspondingly provided on the outer wall of the rear encircling ring, so that the front and rear housings can be fastened together through match of the protruding ends and the slots; the front housing is provided with a handling cover; a fixing device, which comprises a draw bar, a spring and a pressing plate, is provided at one slot of the rear encircling ring.