Modular fan blade

Abstract

A modular fan blade includes a first fan blade and a second fan blade. The first fan blade includes a hub and plural first vanes, and the hub has an external periphery, and the first vane is combined with the external periphery, and a flange is formed at the external periphery and a retaining space is formed on a surface of the flange; and the second fan blade includes a fan frame and plural second vanes, and the fan frame is installed at the flange of the hub, sheathed on the hub, and installed in the retaining space, so as to achieve the effects of increasing the wind output of the fan effectively and replacing the blades conveniently.

Claims

1. A modular fan blade, comprising: a first fan blade, including a hub and a plurality of first vanes, and the hub having an external periphery, and the first vanes being combined to the external periphery, and the external periphery having a flange formed thereon, and a retaining space formed on a surface of the flange; and a second fan blade, including a fan frame, and a plurality of second vanes connected to the external periphery of the fan frame, and the fan frame being disposed at the flange of the hub, engaged with the hub, and installed in the retaining space, wherein each of the first vanes has a groove formed on a side proximate to the hub, and an end of some of the second vanes is disposed in the groove of the first vanes, and a depth of the some of the second vanes inserted in the groove of the first vanes extending in a direction parallel to a central axis of the hub is larger than half a height of the second vanes extending in the direction parallel to the central axis of the hub.

2. The modular fan blade as claimed in claim 1, wherein the hub has a plurality of latch slots formed on the flange, the fan frame having a plurality of hooks corresponsive to the plurality of latch slots respectively, and the second fan blade is latched to the latch slots through the hooks and combined with the hub.

3. The modular fan blade as claimed in claim 1, wherein the second vanes are partially disposed on the first vanes.

4. The modular fan blade as claimed in claim 1, wherein the fan frame has an inner peripheral surface attached onto an external peripheral surface of the hub.

5. The modular fan blade as claimed in claim 1, wherein the first fan blade is an axial flow fan blade, and the second fan blade is a centrifugal fan blade.

6. The modular fan blade as claimed in claim 1, wherein the first vanes and the second vanes are in a rotary radial shape.

7. The modular fan blade as claimed in claim 6, wherein the first vanes and the second vanes rotate in the same direction.

8. The modular fan blade as claimed in claim 1, wherein each of the second vanes is an oblique plate or a wavy plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an exploded view of a modular fan blade of this disclosure;

(2) FIG. 2 is a perspective view of a modular fan blade of this disclosure;

(3) FIG. 3 is a planar view of a modular fan blade of this disclosure;

(4) FIG. 4 is a cross-sectional view of a modular fan blade of this disclosure;

(5) FIG. 5 shows a second exemplary embodiment of a modular fan blade of this disclosure; and

(6) FIG. 6 shows a third exemplary embodiment of a modular fan blade of this disclosure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(7) The technical contents of this disclosure will become apparent with the detailed description of preferred embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and figures disclosed herein are to be considered illustrative rather than restrictive.

(8) With reference to FIGS. 1 to 4 for an exploded view, a perspective view, a planar view and a cross-sectional view of a modular fan blade of this disclosure respectively, the modular fan blade 1 comprises a first fan blade 10 and a second fan blade 20. The second fan blade 20 is combined with the first fan blade 10 to form the modular fan blade 1 by a combining method.

(9) The first fan blade 10 includes a hub 11 and a plurality of first vanes 12. The hub 11 has an external periphery 111, and the first vanes 12 are combined with the external periphery 111, and a flange 112 is formed at the external periphery 111, and a retaining space 110 is formed at a surface of the flange 112.

(10) The second fan blade 20 includes a fan frame 21 and a plurality of second vanes 22 connected to the external periphery of the fan frame 21. The fan frame 21 is installed to the flange 112 of the hub 11 of the first fan blade 10, sheathed on the hub 11, and installed in the retaining space 110. Therefore, the second vanes 22 of the second fan blade 20 are situated between the outer side of the hub 11 of the first fan blade 10 and the first vanes 12.

(11) In an exemplary embodiment of this disclosure as shown in 1, the hub 11 has a plurality of latch slots 113 formed on the flange 112, and the fan frame 21 has a plurality of hooks 211 corresponsive to the plurality of latch slots 113 respectively, and the second fan blade 20 is latched into the latch slots 113 through the hooks 211 and combined to the hub 11 of the first fan blade 10.

(12) In this exemplary embodiment as shown in FIG. 3, the first fan blade 10 is an axial flow fan blade, and the second fan blade 20 is a centrifugal fan blade. In actual applications, the first fan blade 10 and the second fan blade 20 are not limited to which fan blade. For example, both the first fan blade 10 and the second fan blade 20 may be axial flow fan blades or centrifugal fan blades, or the first fan blade 10 and the second fan blade 20 are a centrifugal fan blade and an axial flow fan blade respectively.

(13) Preferably, the second vanes 22 are partially disposed on the first vanes 12. Specifically, each of the first vanes 12 has a groove 120 formed on a side proximate to the hub 11, and an end of some of the second vanes 22 is disposed in the groove 120 of the first vanes 12 in order to reduce the total volume of the modular fan blade 1. In an exemplary embodiment of this disclosure, the first vanes 12 and the second vanes 22 are in rotary radiating shape. In addition, the first vanes 12 and the second vanes 22 rotate in opposite directions, but this disclosure is not limited to this arrangement only. For example, the first vanes 12 and the second vanes 22 may be rotated in the same direction as well.

(14) In FIG. 4, after the second fan blade 20 is latched to the latch slots 113 through the hooks 211 and combined to the first fan blade 10, the inner peripheral surface of the fan frame 21 is attached to the external peripheral surface of the hub 11. It is noteworthy that the second fan blade 20 is combined with the first fan blade 10 through the hooks 211; however, in practical applications, the second fan blade 20 is combined with the first fan blade 10 by a screwing method. For example, corresponsive threads are formed on the inner wall of the fan frame 21 and the external periphery 111 of the hub 11 and provided for screwing the second fan blade 20 to the first fan blade 10.

(15) With reference to FIGS. 5 and 6 for the second exemplary embodiment and the third exemplary embodiment of a modular fan blade of this disclosure respectively, the modular fan blade 1a as shown in FIG. 5 comprises a first fan blade 10a and a second fan blade 20a. The first fan blade 10a includes a hub 11a and a plurality of first vanes 12a. In addition, the second fan blade 20a includes a fan frame 21a and a plurality of second vanes 22a. The difference between this embodiment and the previous embodiment resides on the configuration of the second vanes 22a. In this embodiment, the quantity of second vanes 22a is greater, and each of the second vanes 22a is a wavy plate.

(16) The modular fan blade 1b as shown in FIG. 6 comprises a first fan blade 10b and a second fan blade 20b. The first fan blade 10b includes a hub 11b and a plurality of first vanes 12b, and the second fan blade 20b includes a fan frame 21b and a plurality of second vanes 22b. The difference between this embodiment and the previous embodiments resides on the configuration of the second vanes 22b. In this embodiment, the second vanes 22b have a smaller rotating angle, and each of the second vanes 22a is an oblique plate, and the second vane 22a has a smaller extension length.

(17) In the modular fan blades 1, 1a, 1b of this disclosure, the second fan blades 20, 20a, 20b are combined with the first fan blade 10, 10a, 10b. The combination of the first fan blades 10, 10a, 10b and the second fan blade 20, 20a, 20b improves the wind output of the fan. In addition, the first fan blades 10, 10a, 10b and the second fan blades 20, 20a, 20b of this disclosure may be used to axial flow fan blades or centrifugal fan blades as needed, so as to improve the flexibility of use.

(18) While this disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of this disclosure set forth in the claims.