Apparatus for abating noise in axial blower

Details Apparatus for abating noise in axial blower Apparatus for abating noise in axial blower

1977-12-08

1979-10-23

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

415119, F04B 4906, F01D 2500

Patent

active

041719310

ABSTRACT:
In an axial blower, the noise generated by the blower increases generally in proportion to the increasing number of rotations of the blower's rotor. It has been ascertained, however, that over a given range of rotational speeds, the magnitude of noise plotted in a graph as the function of the rotational speed describes not a smooth curve but a zigzagging curve, indicating that zones of rotational speeds producing high levels of noise and those producing low levels of noise are distributed irregularly. When the axial blower is required to be operated within an operatively permissible range of rotational speeds, therefore, the noise generated by the blower can be abated to the fullest extent without entailing any reduction in the operational efficiency of the blower by means of a system which follows the change in magnitude of the noise generated by the blower as the rotational speed of the blower's rotor is sequentially changed little by little from one boundary to the other of the said range, compares the magnitudes being registered, determines the particular rotational speed that produces the lowest level of noise within the range and fixes the operation of the blower's rotor at that particular rotational speed.

REFERENCES:
patent: 3315522 (1967-04-01), Frarey et al.
patent: 3913084 (1975-10-01), Bollinger
patent: 3929008 (1975-12-01), Nikolevich et al.

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