Axial flow fan blade structure for cooling tower

Abstract

The utility model relates to the field of fan blades, and particularly discloses an axial flow fan blade structure for a cooling tower. The number of the blades is at least two, and the blades are evenly distributed in the circumferential direction of the hub; one end of the blade handle is mounted on the hub, and the other end is mounted on the blade; a first connecting piece is arranged at one end of each blade, each first connecting piece and the corresponding blade are integrally welded, an included angle is formed between each first connecting piece and the corresponding blade, a notch part is arranged at one end of each first connecting piece, and the end wall of each notch part is obliquely arranged. The method has the effect of high-efficiency operation.

Description

Technical Field

[0001] This application relates to the field of fan blades, and more particularly to a fan blade structure for an axial flow fan used in a cooling tower. Background Technology

[0002] Axial flow fans are a common type of industrial equipment used in industrial production and have broad application prospects. However, the blades of commonly used axial flow fans can deform over time, affecting the fan's efficiency. Utility Model Content

[0003] To improve the efficiency of fan operation, this application provides an axial flow fan blade structure for cooling towers.

[0004] The axial flow fan blade structure for cooling towers provided in this application adopts the following technical solution:

[0005] include:

[0006] Wheel hub;

[0007] The blades, at least two, are evenly distributed along the circumference of the hub;

[0008] The petiole is attached to the hub at one end and to the blade at the other end;

[0009] One end of the blade has a first connecting piece, which is integrally welded to the blade and has an included angle with the blade. One end of the first connecting piece has a notch, and the end wall of the notch is inclined.

[0010] By adopting the above technical solution, the blades are made of aluminum alloy and are low-speed airfoil hollow blades, which have a high lift coefficient, a high lift-to-drag ratio, and wide blades driven at low speeds. High-efficiency operation is achieved by setting an inclined first connecting piece on the blade and an inclined notch on the first connecting piece, ensuring low-speed blade drive.

[0011] In one possible implementation, the connection between the blade and the first connecting piece is modified into an arc-shaped portion.

[0012] In one possible implementation, the blade has a cavity inside for inserting the petiole, and a limiting part is installed inside the cavity, the limiting part being interference-fitted with the petiole.

[0013] In one possible implementation, reinforcing ribs are also provided inside the cavity.

[0014] In one possible implementation, the blade has a second connecting piece at the end away from the petiole, and the second connecting piece is arranged perpendicular to the blade.

[0015] In one possible implementation, the hub is provided with several grooves for connecting with the blade stalk, and the blade stalk is installed in the groove by bolts and nuts.

[0016] In one possible implementation, an annular groove is provided on the leaf stalk, and the bolt has a "U" shaped structure, with the "U" shaped bolt embedded in the annular groove.

[0017] In one possible implementation, the groove of the hub is provided with a raised ring portion, which is engaged with the "U"-shaped bolt and embedded in the annular groove.

[0018] In one possible implementation, there are one or two annular grooves.

[0019] In one possible implementation, a bushing is mounted on the hub to facilitate connection with an axial flow fan.

[0020] In summary, this application includes the following beneficial technical effects: the blades are made of aluminum alloy, are low-speed airfoil-shaped hollow blades, and have a high lift coefficient, a high lift-to-drag ratio, and wide blades for low-speed drive. By providing an inclined first connecting piece on the blade and an inclined notch on the first connecting piece, high-efficiency operation is achieved, ensuring low-speed drive of the blades. Attached Figure Description

[0021] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0022] Figure 2 yes Figure 1 An enlarged schematic diagram of part A;

[0023] Figure 3 yes Figure 1 An enlarged schematic diagram of part B.

[0024] Reference numerals: 1. Hub; 2. Blade stalk; 3. Blade; 4. Bushing; 5. First connecting piece; 6. Notch; 7. Arc-shaped part; 8. Through cavity; 9. Limiting part; 10. Reinforcing rib; 11. Second connecting piece; 12. Groove; 13. Bolt; 14. Annular groove; 15. Raised ring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0026] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0027] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0028] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] Reference Figure 1-3 The axial flow fan blade structure for cooling towers includes a hub 1, a blade holder 2, blades 3, and a bushing 4. The blade holder 2 is mounted on the hub 1, and the blades 3 are mounted on the blade holder 2. There are at least two blades 3, evenly distributed along the circumference of the hub 1. The bushing 4 is mounted on the hub 1 and facilitates the mounting of the hub 1 onto the axial flow fan. Specifically, one end of the blade 3 has a first connecting piece 5, which is integrally welded to the blade 3, and there is an angle between the first connecting piece 5 and the blade 3. One end of the first connecting piece 5 has a notch 6, which is cut off from the first connecting piece 5 on the blade 3 according to precise aerodynamic calculations. The end wall of the notch 6 is inclined, and the connection between the blade 3 and the first connecting piece 5 is modified into an arc-shaped part 7. The blades 3 are made of aluminum alloy, are low-speed airfoil hollow blades, and have a high lift coefficient and a high lift-to-drag ratio, with wide blades driven at low speeds. By providing an inclined first connecting piece 5 on the blade 3 and an inclined notch 6 on the first connecting piece 5, high-efficiency operation is achieved, ensuring that the blade 3 is driven at low speed.

[0030] The wheel hub 1 is made of low-pressure die casting. The wheel hub 1 adopts a one-mold-two-use design, which can install 6-blade 3 or 4-blade 3, which has strong versatility, reduces production costs, and is more suitable for mass production.

[0031] The blade 3 has a cavity 8 inside for inserting the blade stalk 2. A limiting part 9 is installed inside the cavity 8. The limiting part 9 is arc-shaped and is interference-fitted with the blade stalk 2. A reinforcing rib 10 is also provided inside the cavity 8 to enhance the strength of the blade 3.

[0032] The blade 3 has a second connecting piece 11 at the end away from the petiole 2, and the second connecting piece 11 is set perpendicular to the blade 3.

[0033] The stalk 2 is made of grooved steel pipe, which is made of carbon steel or stainless steel.

[0034] The hub 1 has several grooves 12 for connecting with the blade shank 2. The blade shank 2 is installed in the grooves 12 by bolts 13 and nuts. The blade shank 2 has annular grooves 14, with at least one or two grooves. The number of bolts 13 matches the number of annular grooves 14. The bolts 13 have a U-shaped structure, and are embedded in the annular grooves 14. The grooves 12 of the hub 1 have protruding rings 15, which mate with the U-shaped bolts 13 and are embedded in the annular grooves 14. Through the annular grooves 14, the U-shaped bolts 13, and the protruding rings 15, the connection strength between the blade shank 2 and the hub 1 is enhanced. This also makes the blade shank 2 highly efficient, versatile, and reduces production costs. Compared with the old-style blade shank 2, the blade shank 2 of this application is lightweight, high-strength, highly efficient, and aesthetically pleasing.

[0035] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0036] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fan blade structure for an axial flow fan used in a cooling tower, characterized in that: include: Wheel hub (1); The blades (3), at least two, are evenly distributed along the circumferential direction of the hub (1); The petiole (2) is mounted on the hub (1) at one end and on the blade (3) at the other end; The blade (3) has a first connecting piece (5) at one end. The first connecting piece (5) is integrally welded to the blade (3), and there is an angle between the first connecting piece (5) and the blade (3). The first connecting piece (5) has a notch (6) at one end, and the end wall of the notch (6) is inclined.

2. The axial flow fan blade structure for a cooling tower according to claim 1, characterized in that: The connection between the blade (3) and the first connecting piece (5) is modified into an arc-shaped part (7).

3. The axial flow fan blade structure for a cooling tower according to claim 1, characterized in that: The blade (3) has a cavity (8) inside for the blade stalk (2) to be inserted. A limiting part (9) is installed in the cavity (8), and the limiting part (9) is interference-fitted with the blade stalk (2).

4. The axial flow fan blade structure for a cooling tower according to claim 3, characterized in that: The cavity (8) is also provided with reinforcing ribs (10).

5. The axial flow fan blade structure for a cooling tower according to claim 1, characterized in that: The blade (3) has a second connecting piece (11) at one end away from the petiole (2), and the second connecting piece (11) is arranged perpendicular to the blade (3).

6. The axial flow fan blade structure for a cooling tower according to claim 1, characterized in that: The hub (1) is provided with a plurality of grooves (12) that are connected to the blade (2), and the blade (2) is installed in the grooves (12) by bolts (13) and nuts.

7. The axial flow fan blade structure for a cooling tower according to claim 6, characterized in that: The leaf stalk (2) has an annular groove (14), and the bolt (13) has a "U" shaped structure. The "U" shaped bolt (13) is embedded in the annular groove (14).

8. The axial flow fan blade structure for a cooling tower according to claim 7, characterized in that: The hub (1) has a raised ring (15) in the groove (12), and the raised ring (15) and the "U"-shaped bolt (13) are both embedded in the annular groove (14).

9. The axial flow fan blade structure for a cooling tower according to claim 8, characterized in that: The annular groove (14) can be one or two.

10. The axial flow fan blade structure for a cooling tower according to claim 1, characterized in that: The hub (1) is equipped with a bushing (4) for easy connection with an axial flow fan.

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