| 摘要 |
Centrifugal blowers which maintain a substantially constant (usually +/-5%) static pressure field around the circumference of the blower's impeller, notwithstanding at least one abrupt radial or axial discontinuity in the volute of the blower, e.g., due to one or more external axial and/or radial constraints in an irregularly shaped package. The blower accommodates such constraints by including discontinuities in the volute; therefore the blower takes advantage of relatively unconstrained segments of the package to have an overall large size. Notwithstanding the volute discontinuities, a substantially constant pressure field around the impeller is achieved by maintaining a specific relationship between G( THETA ) and H( THETA ), G( THETA ) being radial extent of the volute as a function of the angular displacement THETA around the impeller's circumference and H( THETA ) being the axial extent of the volute as a function of THETA , angular displacement around the volute.
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