Importance

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Abstract

A displacement type rotary air blower which, as a single-stage unit, comprises a single impeller (1) encased between a first half-shell (2) and a second half-shell (3), and in a two-stage version, two such impellers (1, 1a) in a casing formed from two outer half-shells (2) separated by an intermediate half-shell (10) positioned between the impellers; the second half-shell has a raised rim, creating a half-chamber (7) that coincides with the position of inlet and outlet ports incorporated into the first half-shell, the intermediate half-shell in the two-stage unit consisting in two such second half-shells matched symmetrically with their two rims combining to create a sealed chamber (8) the opposite bases of which are pierced to provide an outlet from the first stage and an inlet into the second, internally of the casing.

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First Claim