An inlet guide vane assembly is disclosed, which comprises: a housing, at least one fixing ring, at least one rotary ring, a plurality of vane units, and at least one driving unit. The housing is configured with a first penetration part and a plurality of first grooves; the fixing ring is configured with a second penetration part and a plurality of second grooves; and the rotary ring is configured with a third penetration part and a plurality of sliding chutes; whereas the first penetration part, the second penetration part and the third penetration part are arranged in communication with one another into a passage. Each of the vane unit is composed of a vane, a linkage and a sliding block in a manner that the vane and the sliding block are disposed respectively at the two ends of the linkage, while allowing the linkage to be sandwiched between the first groove and the second groove, the vane to protrude into the passage and the sliding block to inset into the sliding chute. The driving unit is disposed for driving one vane selected from the plural vanes to swing which is used to drive the rotary ring to rotate simultaneously, thereby bringing along the other vanes to swing, enabling the plural sliding blocks to slide inside their corresponding sliding chutes, and consequently the vane is flipped from a first state to a second state.
Inlet guide vane varies from 0 to 90 degree with dial indicator, which is useful to control flow flux.
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