Destressing axial flow blade

Abstract

The utility model belongs to the technical field of fans, and particularly relates to a destressing axial flow blade which comprises a blade main body, a connecting part and a mounting head. According to the destressing axial flow blade, the mounting head of the fan blade is fixedly arranged on the connecting part, the connecting end of the connecting part is further provided with the inwards-concave hole, the inwards-concave hole extends to the side face of the mounting head, and the two sides of the connecting part are each provided with the inclined face. The destressing axial flow blade has the following effects that stress distribution is achieved, and loads can be more evenly transferred and distributed on the blade handle through the inner concave holes cut in a concave mode. Through the concave design, the stress of the material is distributed in a more beneficial mode in the operation process, so that stress concentration is prevented, stress is greatly reduced as much as possible, the strength and the maximum limit rotating speed of the blade are improved, and fatigue and faults are reduced. And weight reduction: the inner concave holes cut in the concave shape are also beneficial to reducing the weight of the whole blade, which is beneficial to reducing inertia force and improving the operation efficiency of the fan.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and in particular relates to a stress-relieving axial flow blade. Background Art

[0002] The assembled fan blade includes a mounting head and a blade body integrally formed on the mounting head. When the assembled fan blade is working, due to the large stress at the connection between the mounting head and the blade body, the stress on the blade is too large when it rotates, which can easily cause damage to the blade. Therefore, the maximum speed of the assembled fan blade is not high, and after working for a long time, the connection is easy to break, causing safety hazards. Utility Model Content

[0003] The utility model aims to provide a stress-relieved axial flow blade, aiming to solve the technical problems in the prior art that there is large stress at the connection between the mounting head and the blade body, the stress is too large when the blade rotates, which easily causes damage to the blade, the limit speed is not high, and the connection is easy to break after working for a long time, causing safety hazards.

[0004] To achieve the above-mentioned purpose, the stress-relief axial flow blade provided in the embodiment of the utility model includes a blade body, a connecting part and a mounting head, wherein the blade body, the connecting part and the mounting head are arranged in sequence, the connecting part is arranged between the blade body and the mounting head, and is respectively connected to the blade body and the mounting head, and inner concave holes are provided at both ends of the mounting head, the inner concave holes are arranged in an arc shape, and one end of the arc surface of the inner concave hole extends to the mounting head, and inclined surfaces are respectively provided on both sides of the connecting part, one end of the inclined surface extends to the side of the mounting head, and the other end extends to the side of the blade body, and the thickness of the connecting part gradually decreases toward both sides with the mounting head as the center.

[0005] As an optional solution of the present invention, the side surface of the blade body is arranged in an arc shape.

[0006] As an optional solution of the present invention, the connecting portion is arranged in an arc shape at one end close to the blade body.

[0007] As an optional solution of the utility model, the mounting head includes a mounting head body and a convex ring, the mounting head body is fixedly connected to the blade body and the convex ring respectively, the width of the convex ring is larger than the mounting head body, and the mounting head body and the convex ring are both cylindrical.

[0008] As an optional solution of the utility model, the inner concave hole has a length of 2 to 50 mm, a width of 5 to 80 mm, and a depth of 5 to 100 mm.

[0009] As an optional solution of the utility model, the outer side surface of the convex ring is fixedly connected to a limiting boss, and the limiting boss is arranged in a polygonal shape.

[0010] The above one or more technical solutions in the stress relief axial flow blade provided by the embodiment of the utility model have at least one of the following technical effects:

[0011] The stress-relief axial flow blade provided in this application has the following effects:

[0012] 1. Stress distribution: The concave cut inner hole helps to transfer and distribute the load more evenly on the blade shank. Through this concave design, the stress of the material is distributed in a more beneficial way during operation to prevent stress concentration, reduce stress as much as possible, improve the strength and maximum speed limit of the blade, and reduce fatigue and failure.

[0013] 2. Weight reduction: The concave holes cut in the concave shape also help to reduce the weight of the entire blade, which is beneficial for reducing inertial force and improving the operating efficiency of the fan.

[0014] 3. Aesthetic and functional design: The concave inner hole can also be chosen for aesthetic reasons. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic structural diagram of a stress-relief axial flow blade provided in an embodiment of the utility model.

[0017] Figure 2 A schematic structural diagram of a stress-relief axial flow blade provided in an embodiment of the utility model.

[0018] Figure 3 A schematic structural diagram of a stress-relief axial flow blade provided in an embodiment of the utility model.

[0019] Figure 4 A schematic structural diagram of a stress-relief axial flow blade provided in an embodiment of the utility model installed on the hub of a fan.

[0020] Among them, the reference numerals in the figure are:

[0021] 1. Blade body; 2. Connecting part; 3. Mounting head; 4. Limiting boss; 5. Hub;

[0022] 21. Inner concave hole;

[0023] 31. Mounting head body; 32. Convex ring. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0027] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0028] In one embodiment of the present invention, Figures 1 to 3As shown, a stress-relieving axial flow blade is provided, comprising a blade body 1, a connecting portion 2 and a mounting head 3. The blade body 1, the connecting portion 2 and the mounting head 3 are arranged in sequence, and the connecting portion 2 is arranged between the blade body 1 and the mounting head 3, and is fixedly connected to the blade body 1 and the mounting head 3 respectively. An inner concave hole 21 is provided at both ends of the mounting head 3, and the inner concave hole 21 is arranged in an arc shape, and one end of the arc surface of the inner concave hole 21 extends to the mounting head 3. The inner concave hole 21 can be used for stress release, which reduces stress and improves the service life of the blade of the present application. Inclined surfaces are respectively provided on both sides of the connecting portion 2, one end of the inclined surface extends to the side of the mounting head 3, and the other end extends to the side of the blade body 1. The thickness of the connecting portion 2 gradually decreases toward both sides with the mounting head 3 as the center, so that the structure of the mounting head 3 and the connecting portion 2 is more stable and the connection is more secure. The stress-relieving axial flow blade provided in the present application has the following effects: 1. Stress distribution: The concavely cut inner concave hole 21 helps to transfer and distribute the load more evenly on the blade handle. Through this concave design, the stress of the material is distributed in a more beneficial way during operation to prevent stress concentration, reduce stress as much as possible, improve the strength and maximum speed limit of the blade, and reduce fatigue and failure. 2. Weight reduction: The concave cut inner concave hole 21 also helps to reduce the weight of the entire blade, which is beneficial for reducing inertial force and improving the operating efficiency of the fan. 3. Aesthetic and functional design: The concave inner concave hole 21 can also be selected for aesthetics.

[0029] In another embodiment of the utility model, the side surface of the blade body 1 of the stress-relieving axial flow blade is arranged in an arc shape, thereby increasing the lateral contact area with the air and increasing the air volume.

[0030] In another embodiment of the present invention, the connecting portion 2 of the stress-relieving axial flow blade is arranged in an arc shape at one end close to the blade body 1 .

[0031] In another embodiment of the utility model, the mounting head 3 of the stress-relieved axial flow blade comprises a mounting head body 31 and a convex ring 32, wherein the mounting head body 31 is fixedly connected to the blade body 1 and the convex ring 32. The width of the convex ring 32 is greater than that of the mounting head body 31, and both the mounting head body 31 and the convex ring 32 are cylindrical.

[0032] In another embodiment of the utility model, the inner concave hole 21 of the stress-relieving axial flow blade has a length of 2 to 50 mm, preferably 30 mm, a width of 5 to 80 mm, preferably 50, and a depth of 5 to 100 mm, preferably 30 mm. The inner concave hole 21 can be used for stress release to avoid stress concentration in the blade body 1 and fracture, thereby increasing the service life of the blade body 1.

[0033] In another embodiment of the utility model, the outer side surface of the convex ring 32 of the stress-relieving axial flow blade is fixedly connected to the limiting boss 4, and the limiting boss 4 is arranged in a polygonal shape.

[0034] The stress-relieved axial flow blade provided in the present application is fixed to the hub 5 of the fan through a mounting head 3 .

[0035] The stress-relieved axial flow blade provided by the present application has the following effects: 1. Stress distribution: The concavely cut inner recessed hole 21 helps to transfer and distribute the load more evenly on the blade handle. Through this concave design, the stress of the material is distributed in a more beneficial way during operation to prevent stress concentration, reduce stress as much as possible, improve the strength and maximum limiting speed of the blade, and reduce fatigue and failure. 2. Weight reduction: The concavely cut inner recessed hole 21 also helps to reduce the weight of the entire blade, which is beneficial for reducing inertial force and improving the operating efficiency of the fan. 3. Aesthetic and functional design: The concave inner recessed hole 21 can also be selected for aesthetics.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stress-relief axial flow blade, characterized in that: It includes a blade body, a connecting part and a mounting head, which are arranged in sequence. The connecting part is arranged between the blade body and the mounting head and is respectively connected to the blade body and the mounting head. Concave holes are arranged at both ends of the mounting head. The concave holes are arranged in an arc shape, and one end of the arc surface of the concave hole extends to the mounting head. Inclined surfaces are respectively arranged on both sides of the connecting part, one end of the inclined surface extends to the side of the mounting head, and the other end extends to the side of the blade body. The thickness of the connecting part gradually decreases toward both sides with the mounting head as the center.

2. The stress-relief axial flow blade according to claim 1, characterized in that: The side surface of the blade body is arranged in an arc shape.

3. The stress-relief axial flow blade according to claim 1, characterized in that: One end of the connecting portion close to the blade body is arranged in an arc shape.

4. The stress-relief axial flow blade according to claim 1, characterized in that: The mounting head comprises a mounting head body and a convex ring. The mounting head body is fixedly connected to the blade body and the convex ring respectively. The width of the convex ring is greater than that of the mounting head body. Both the mounting head body and the convex ring are cylindrical.

5. The stress-relief axial flow blade according to claim 1, characterized in that: The inner concave hole has a length of 2 to 50 mm, a width of 5 to 80 mm, and a depth of 5 to 100 mm.

6. The stress-relief axial flow blade according to claim 4, characterized in that: The outer side surface of the convex ring is fixedly connected to a limiting boss, and the limiting boss is arranged in a polygonal shape.

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