CN220600074U

CN220600074U - Axial flow fan blade

Info

Publication number: CN220600074U
Application number: CN202321459949.9U
Authority: CN
Inventors: 梁炜亮; 毛义胜; 韦宏茂; 覃万翔; 梁燕好
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2023-06-08
Filing date: 2023-06-08
Publication date: 2024-03-15
Anticipated expiration: 2033-06-08

Abstract

An axial flow fan blade comprises a hub and a plurality of blades circumferentially distributed on the hub, wherein the outer edges of the blades are provided with turned edges, the junction of the outer edges of the blades and the tail edges is provided with fins, and the fins are arranged on back pressure surfaces of the blades; the wing panel molded lines are arranged along the vertical direction; the height of the blade is H, the height of the starting position of the wing panel on the blade is H1, and H1=0.2H-0.5H; the wing panel molded lines are parabolic, and two ends of the wing panel molded lines are respectively and smoothly transited with the back pressure surface of the blade; the length of the flanging is L, and the position of the wing panel in the radial direction of the axial flow fan blade is from the starting position of the flanging to the position of the length L/2 of the flanging; the maximum height of the wing panel is B, and B=L/3-2L/3; the thickness of the blade is a, the thickness of the fin is x, and x=0.9a to 1.2a. The axial flow fan blade is provided with the special winglet structure at one end of the back pressure surface (pressure surface) in the intersection area of the outer edge and the tail edge of the blade, and the winglet structure can effectively reduce the pressure difference of the blade tip, reduce the leakage loss between the blade tip and the guide ring, reduce the leakage rate of the blade tip and improve the efficiency of the fan.

Description

Axial flow fan blade

Technical Field

The utility model relates to the technical field of fans, in particular to an axial flow fan blade.

Background

Chinese patent document No. CN109469644a discloses an axial flow fan blade in 2019, 3 and 15 days, comprising a hub and a plurality of blades; a middle disc is arranged in the axial middle of the hub, and axially divides the hub into a first shaft part and a second shaft part; the shaft end edges of the first shaft part and the second shaft part undulate in a corrugated shape along the circumferential direction of the hub, and the convex part and the concave part of the first shaft part are respectively matched with the concave part and the convex part of the second shaft part in a corrugated shape; the hub is provided with a shaft sleeve at the center, and the shaft sleeve forms an equal-thickness side wall based on the shape of the shaft hole at the periphery of the shaft hole; the inner side wall of the shaft hole at least comprises two linear sections which are not on the same circumference; the blade is provided with blade reinforcing ribs which are arranged along the outer contour edges of the rear edge, the outer edge and the front edge of the blade; the inner edge of the blade is connected and reinforced with the outer side wall surface of the hub through a plurality of first reinforcing ribs and a plurality of second reinforcing ribs; the pressure difference of the blade tops of the axial flow fan blades is large, so that leakage loss between the blade tops and the guide rings is large, and the efficiency of the fan is low.

Therefore, further improvements are needed.

Disclosure of Invention

The utility model aims to provide an axial flow fan blade with simple and reasonable structure, small blade tip pressure difference, small leakage loss and strong practicability, so as to overcome the defects in the prior art.

According to the axial fan blade of this purpose design, including wheel hub and a plurality of blades of circumference distribution on wheel hub, its characterized in that: the outer fringe of blade is provided with the turn-ups, and the outer fringe of blade is provided with the fin with trailing edge intersection department, and the fin setting is on the blade backpressure face.

The airfoil profile is disposed in a vertical direction.

The height of the blade is H, and the height of the vane at the starting position of the blade is H1, wherein H1 = 0.2H-0.5H.

The wing panel molded lines are parabolic, and both ends of the wing panel molded lines are respectively in smooth transition with the back pressure surface of the blade.

The length of the flanging is L, and the position of the wing piece in the radial direction of the axial flow fan blade is from the starting position of the flanging to the position of the length L/2 of the flanging.

The maximum height of the fin is B, and B=L/3-2L/3.

The thickness of the blade is a, the thickness of the fin is x, and x=0.9a to 1.2a.

The outer edge of the blade is bent towards the positive pressure surface of the blade to form a flanging.

The wing panel is arranged at the inner edge of the flanging.

The turnup and the wing are arranged at one end of the blade far away from the hub.

The flange structure is arranged at the outer edge of the axial flow fan blade, the special winglet structure (wing) is arranged at one end of the back pressure surface (pressure surface) and the intersection area of the outer edge and the tail edge of the blade, and the winglet structure can effectively reduce the pressure difference of the top of the blade, reduce the leakage loss between the top of the blade and the guide ring, reduce the leakage rate of the top of the blade and improve the efficiency of the fan.

Drawings

Fig. 1 is a schematic diagram of an overall structure of axial flow fan blades according to an embodiment of the present utility model.

FIG. 2 is a cross-sectional view of axial flow fan blades according to an embodiment of the present utility model.

FIG. 3 is a schematic view of an overall structure of an axial flow fan blade in another orientation according to an embodiment of the present utility model.

FIG. 4 is a schematic view of the overall structure of a blade according to an embodiment of the present utility model.

Fig. 5 is a schematic view of a part of a axial flow fan blade according to an embodiment of the utility model.

Fig. 6 is a front view of a blade in an embodiment of the utility model.

Detailed Description

The utility model is further described below with reference to the drawings and examples.

Referring to fig. 1-6, the axial flow fan blade comprises a hub 1 and a plurality of blades 2 circumferentially distributed on the hub 1, wherein a flanging 3 is arranged at the outer edge of each blade 2, a wing piece 4 is arranged at the junction of the outer edge of each blade 2 and the tail edge, and the wing piece 4 is arranged at one end of the back pressure surface of each blade 2.

Referring to fig. 2, the profile of the airfoil 4 is arranged in a vertical direction so that the blade 2 is easy to demold during production.

Referring to fig. 4, the height of the blade 2 is H, and the height of the vane 4 at the start position on the blade 2 is H1, h1=0.2h to 0.5H.

The profile line of the wing panel 4 is approximately parabolic, and two ends of the profile line of the wing panel 4 are respectively in smooth transition with the back pressure surface of the blade 2.

Referring to fig. 6, the length of the flange 3 is L, and the position of the fin 4 in the radial direction of the axial flow fan blade is from the starting position a of the flange 3 to the length L/2 of the flange 3.

Referring to fig. 4, the maximum height of the vane 4 is B, b=l/3 to 2L/3.

Referring to fig. 5 and 6, the thickness of the blade 2 is a, and the thickness of the vane 4 is x, x=0.9 a to 1.2a.

The outer edge of the blade 2 is bent towards the positive pressure surface of the blade 2 to form a flanging 3.

The fins 4 are arranged at the inner edge of the flange 3.

The turn-ups 3 and the fins 4 are arranged at the end of the blade 2 remote from the hub 1.

The foregoing is a preferred embodiment of the utility model showing and describing the general principles, features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the foregoing embodiments, which have been described in the foregoing description merely illustrates the principles of the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an axial fan blade, includes wheel hub (1) and a plurality of blades (2) of circumference distribution on wheel hub (1), its characterized in that: the outer fringe of blade (2) is provided with turn-ups (3), and the outer fringe of blade (2) is provided with fin (4) with trailing edge junction, fin (4) set up on blade (2) backpressure face.

2. The axial flow fan blade of claim 1, wherein: the profile of the wing panel (4) is arranged along the vertical direction.

3. The axial flow fan blade of claim 1, wherein: the height of the blade (2) is H, the height of the vane (4) at the starting position of the blade (2) is H1, and H1=0.2H-0.5H.

4. The axial flow fan blade of claim 1, wherein: the profile of the wing panel (4) is parabolic, and two ends of the profile of the wing panel (4) are respectively and smoothly transited with the back pressure surface of the blade (2).

5. The axial flow fan blade of claim 1, wherein: the length of the turnup (3) is L, and the position of the wing piece (4) in the radial direction of the axial flow fan blade is from the starting position (A) of the turnup (3) to the length L/2 of the turnup (3).

6. The axial flow fan blade of claim 5, wherein: the maximum height of the fin (4) is B, and B=L/3-2L/3.

7. The axial flow fan blade of claim 1, wherein: the thickness of the blade (2) is a, and the thickness of the fin (4) is x, wherein x=0.9a-1.2a.

8. The axial flow fan blade of claim 1, wherein: the outer edge of the blade (2) is bent towards the positive pressure surface of the blade (2) to form a flanging (3).

9. The axial flow fan blade of claim 1, wherein: the wing pieces (4) are arranged at the inner edge of the flanging (3).

10. The axial flow fan blade of claim 1, wherein: the turnup (3) and the wing (4) are arranged at one end of the blade (2) far away from the hub (1).