Axial flow fan with multiple segment blades
First Claim
1. A blade structure with multiple segment blades, comprising:
- a hub; and
a plurality of blade units connected to a periphery of the hub and extending radially outward from the periphery, wherein each of the blade units at least includes a first blade and a second blade, and a segment space is positioned between the first blade and the second blade to maintain a laminar flow of fluid passing over a surface region of the first blade and the second blade, wherein the second blade is configured in front of an upper surface of the first blade in a direction perpendicular to a flow direction of the fluid, and has a leading edge positioned adjacent to a first rear edge of the first blade for introducing the fluid from the first blade and reforming a boundary layer of the fluid passed through the upper surface of the first blade so as to prevent a separation effect on the upper surface of the first blade.
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Accused Products
Abstract
An axial flow fan with a plurality of segment blades is described. The axial flow fan has a base, a hub and a plurality of blade units. The hub is mounted on, or pivots on, the base and supports the blade units. Each of the blade units is connected to a periphery of the hub and extends radially outward from the base has a plurality of segment blades. A segment space between the segment blades reforms a boundary layer of fluid passing over the segment blades and reduces the thickness of the boundary layer on the blade surfaces. As a result, the separation between the blade surfaces and fluid is avoided to maintain a laminar flow of the fluid adjacent to the segment blades.
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Citations
18 Claims
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1. A blade structure with multiple segment blades, comprising:
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a hub; and
a plurality of blade units connected to a periphery of the hub and extending radially outward from the periphery, wherein each of the blade units at least includes a first blade and a second blade, and a segment space is positioned between the first blade and the second blade to maintain a laminar flow of fluid passing over a surface region of the first blade and the second blade, wherein the second blade is configured in front of an upper surface of the first blade in a direction perpendicular to a flow direction of the fluid, and has a leading edge positioned adjacent to a first rear edge of the first blade for introducing the fluid from the first blade and reforming a boundary layer of the fluid passed through the upper surface of the first blade so as to prevent a separation effect on the upper surface of the first blade. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A blade structure with multiple segment blades, comprising:
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a hub; and
a plurality of blade units connected to a periphery of the hub and extending radially outward from the periphery, wherein each of the blade units at least includes a first blade and a second blade having a leading edge positioned adjacent to a first rear edge of the first blade, a first length of the first blade in a flow direction of the fluid is greater than a second length of the second blade in the flow direction, and a segment space between the first blade and the second blade maintains a laminar flow of fluid passing over an upper surface of the first blade, wherein the second blade is configured in front of the upper surface of the first blade in a direction perpendicular to the flow direction of the fluid. - View Dependent Claims (8, 9, 10, 11)
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12. An axial flow fan with multiple segment blades, the axial flow fan comprising:
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a frame base;
a hub disposed on the frame base to support the multiple segment blades; and
a plurality of blade units connected to a periphery of the hub and extending radially outward from the periphery, wherein each of the blade units at least includes a first blade and a second blade having a leading edge positioned adjacent to a first rear edge of the first blade, and a segment space between the first blade and the second blade keeps a laminar flow of fluid passing over upper surfaces of the first blade and the second blade, wherein the second blade is configured in front of the upper surface of the first blade in a direction perpendicular to the flow direction of the fluid. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification