Axial-flow fan
DCFirst Claim
1. An axial-flow fan comprising a drive motor means, a scroll plate means surrounding an impeller means having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane of the fan and extending towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter and accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor means, the impeller hub and a mounting flange for the drive motor means, said core means having an annular surface reduced in diameter towards the inlet side, the annular surface having an axial length at least about one-third of a length of the hub, and with respect to the axial median plane, the scroll plate means being asymmetrical in the corner areas and being cylindrical over a longer distance from the axial medial plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from the inlet side of the fan into the corner areas.
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Abstract
An axial-flow fan, particularly a small fan which is axially compact, with a scroll plate surrounding the impeller and whose inner contour has a cylindrical configuration in the vicinity of the axial median plane and extends both towards the inlet side and the outlet side in a polygonal, particularly square profile accompanied by the formation of corner areas, and with a central, coaxial core formed by the drive motor, the impeller hub and the mounting flange for the drive motor; the core thereby has an annular surface conically tapering towards the inlet side face whose axial length is at least one-third of the hub length; with respect to the axial median plane, the scroll plate is asymmetrical in the corner areas and is made cylindrical over a longer distance from the axial median plane to the inlet side than to the outlet side.
32 Citations
32 Claims
- 1. An axial-flow fan comprising a drive motor means, a scroll plate means surrounding an impeller means having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane of the fan and extending towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter and accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor means, the impeller hub and a mounting flange for the drive motor means, said core means having an annular surface reduced in diameter towards the inlet side, the annular surface having an axial length at least about one-third of a length of the hub, and with respect to the axial median plane, the scroll plate means being asymmetrical in the corner areas and being cylindrical over a longer distance from the axial medial plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from the inlet side of the fan into the corner areas.
- 20. An axial-flow fan, comprising a drive motor, a scroll plate means surrounding an impeller having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane and being widened towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor, the impeller hub and a mounting flange for the drive motor means, said core means having an outer annular surface tapering towards the inlet side so that an inlet channel tapering in the direction of air flow is formed, the annular surface having an axial length which amounts to at least one-third of a length of the hub, the scroll plate means being constructed asymmetrically in the corner areas with respect to the axial median plane and cylindrically over a longer distance from the axial median plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from the inlet side of the fan into the corner areas.
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29. An axial-flow fan comprising a drive motor means, a scroll plate means surrounding an impeller means having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane of the fan and extending towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter and accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor means, the impeller hub and a mounting flange for the drive motor means, said core means having an annular surface reduced in diameter towards the inlet side, the annular surface having an axial length extending for a given distance along the length of the hub, and with respect to the axial median plane, the scroll plate means being asymmetrical in the corner areas and being cylindrical over a longer distance from the axial medial plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from an area adjacent the inlet side of the fan into the corner areas.
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30. An axial-flow fan comprising a drive motor means, a scroll plate means surrounding an impeller means having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane of the fan and extending towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter and accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor means, the impeller hub and a mounting flange for the drive motor means, said core means having an annular surface reduced in diameter towards the inlet side, the annular surface having an axial length extending for a given distance along the length of the hub, and with respect to the axial median plane, the scroll plate means being asymmetrical in the corner areas and being cylindrical over a longer distance from the axial medial plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which in length is greater than the cylindrical length portion of the scroll plate.
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31. An axial-flow fan, comprising a drive motor, a scroll plate means surrounding an impeller having a hub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane and being widened towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor, the impeller hub and a mounting flange for the drive motor means, said core means having an outer annular surface tapering towards the inlet side so that an inlet channel tapering in the direction of air flow is formed, th annular surface having an axial length which extending for a given distance along the a length of the hub, the scroll plate means being constructed asymmetrically in the corner areas with respect to the axial median plane and cylindrically over a longer distance from the axial median plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which extends from an area adjacent the inlet side of the fan into the corner areas.
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32. An axial-flow fan, comprising a drive motor, a scroll plate means surrounding an impeller having ahub, an inner contour of said scroll plate means having a cylindrical configuration in a vicinity of an axial median plane and being widened towards an inlet side of the fan and with an outlet side of the scroll plate means formed into a polygonal profile circumscribing an impeller diameter accompanied by formation of corner areas, and a central, coaxial core means formed by the drive motor, the impeller hub and a mounting flange for the drive motor means, said core means having an outer annular surface tapering towards the inlet side so that an inlet channel tapering in the direction of air flow is formed, the annular surface having an axial length which extending for a given distance along the length of the hub, the scroll plate means being constructed asymmetrically in the corner areas with respect to the axial median plane and cylindrically over a longer distance from the axial median plane to the inlet side than to the outlet side and wherein the impeller means has an outside edge which in length is greater than the cylindrical length portion of the scroll plate.
Specification