subject: There is also provided a mold for manufacturing an impeller for an axial fan having the impeller integrally formed [print this page] There is also provided a mold for manufacturing an impeller for an axial fan having the impeller integrally formed
In this fan type, the blades are oriented such that they lean forward in the same direction as rotation of the fan. These fans can be further classified as flat blade and curved blade fans based on the geometry of the blades. Forward curved blades are capable of delivering greater static pressure and air volume than the airfoil backward blade. The forward curved blade fans operate at lower speeds and are particularly suitable as small fans for a ventilation system. While backward curved blades are more efficient, forward curved blade exhibits a "self-cleaning" property, a fact that has led to their use in applications with high dust concentrations, or to systems with air conveyed material.
The present invention relates to an axial fan, a method of manufacturing an impeller for the axial fan, and a mold for manufacturing the impeller of the axial fan and, more particularly, to a technology concerning an axial fan having an impeller that can obtain a sufficiently large air flow and wind pressure regardless of its compact, flat shape.
According to this proposal, the plurality of vanes formed on the outer circumferential surface of the impeller of the axial fan are continuously molded to form under portions or back side portions extending to the central portion of the base portion of the impeller. Therefore, the slide piece of the mold that forms the "under-molding portions" for the vanes must be pulled out from the central portion of the base portion of the impeller in parallel to the radial direction. As a result, the mold cannot but become complicated. Accordingly, the mold becomes very expensive.
In this fan type, the blades are oriented such that they lean forward in the same direction as rotation of the fan. These fans can be further classified as flat blade and curved blade fans based on the geometry of the blades. Forward curved blades are capable of delivering greater static pressure and air volume than the airfoil backward blade. The forward curved blade fans operate at lower speeds and are particularly suitable as small fans for a ventilation system. While backward curved blades are more efficient, forward curved blade exhibits a "self-cleaning" property, a fact that has led to their use in applications with high dust concentrations, or to systems with air conveyed material.
In an axial fan, an impeller, which is formed by arranging a plurality of vanes on the outer circumferential surface of a rotor having a permanent magnet on its inner circumference, is supported to be rotatable about the main body side stator of the axial fan. When a rotating magnetic field is generated in the stator, a desired air flow and wind pressure are obtained upon rotation of the rotor. Since the axial fan can be made compact and flat, it is incorporated mainly in an electronic equipment which is formed compact and flat, to prevent an increase in temperature (caused by heat generated by an internal electronic circuit board and the like.
The present invention has been made in view of the problems described above, and has as its object to provide a compact, flat axial fan which is not limited by the shape of an incorporated rotor magnet and ensures a sufficiently large air flow and wind pressure, wherein the slide (under) piece of a mold that forms the under-molding portions of the vanes of the impeller of the axial fan is pulled out while being twisted (while performing a helical motion) in the direction of the central axis of the base portion of the impeller, so that the mold can be formed simple to realize a multi-cavity mold, and the vanes can be formed into an ideal form by setting vane angles depending on different rotating peripheral velocities of the vanes, so that air can be supplied from the under-molding portions of the vanes to the vanes on the outer circumferential side during rotation of the impeller, a method of manufacturing an impeller for the axial fan, and a mold for manufacturing the impeller of the axial fan.
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