A non-equal-thickness double-web plate hub for a propeller fan

Abstract

The utility model relates to a non - equal thick double support plate wheel hub for axial flow fan, the utility model discloses the structure of upper support plate and lower support plate cooperate upper and lower clamp is used to fix fan blade, forms the mounting structure of closure, and the annular package of blade pulp root is carried out, improves the reliability of installation, and the upper support plate of relatively thick guarantees the strength of overall structure, and the lower support plate is used as the auxiliary support to blade, can effectively promote overall rigidity, through reducing the thickness of lower support plate and opening the hole in the center, can effectively reduce the weight of overall structure while guaranteeing the structural strength. The upper and lower clamp structure cooperation two sides set up the double -end fastening bolt and carry out the clamping fixation fan blade, guarantee structural connection stable, improve the operation safety of fan. And through the stop washer and be connected fixed between the double -end fastening bolt, and through setting the notch on the stop washer, through bending can make it be covered on the nut, play the effect of anti - loosening, guarantee the connection stability of double -end fastening bolt.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, specifically to a non-uniform thickness double support plate hub for axial flow fans. Background Technology

[0002] The excellent water-saving and environmental protection properties of axial flow fans have led to their widespread application in the power and chemical industries. The fan hub, as the intermediate connecting component between the reducer and the blades, is crucial for structural stability and reliability. Currently, the industry mainly uses a single support plate with U-bolts for axial flow fan hubs. The U-bolts are secured to the blade roots by semi-circular retaining rings. However, this structure, with its small contact area between the U-bolts and the pressure plate, and only single-sided positioning, is susceptible to fatigue and even breakage of the U-bolts and retaining rings under the constant wind and sand erosion and unpredictable impact of crosswinds in Northwest China. This poses a significant challenge to the continuity and safety of production.

[0003] Furthermore, during the summer, due to high ambient temperatures and heavy cooling loads, wind turbines may operate at frequencies up to 55Hz. At this frequency, the aerodynamic axial force on the hub, the centrifugal force on the blades, and the residual unbalanced force all increase. Combined with the influence of unpredictable crosswinds, this puts a strain on the overall strength of the hub and its components. Market feedback indicates that several projects have experienced frequent U-bolt and pressure plate breakage, and in some cases, blades have even fractured at high speed due to fatigue, causing damage to surrounding equipment. Utility Model Content

[0004] In view of the problems existing in the prior art, this utility model discloses a non-uniform thickness double-plate hub for an axial flow fan. The technical solution adopted is that the coupling is the connecting part between the entire hub and the fan reducer. The coupling is fixedly connected to the center position of the upper support plate by coupling bolts. The lower support plate is fixedly connected to the upper support plate by first double-headed fastening bolts. The first double-headed fastening bolts are evenly distributed on the upper and lower support plates in a circle. The coupling, the upper support plate and the lower support plate are coaxial. A support sleeve passes through the middle of the first double-headed fastening bolts. The two ends of the support sleeve press against the upper and lower support plates respectively, thereby supporting the upper and lower support plates and preventing the middle of the upper support plate from concave deformation. The lower surface of the upper support plate is fixed by clamp positioning bolts. The upper clamp is evenly distributed in a circle on the upper support plate. The lower support plate is fixedly connected to the upper surface by the clamp positioning bolts. The lower clamps correspond one-to-one with the upper clamps. The fan blades of the axial flow fan are clamped and fixed between the upper clamps and the lower clamps. The upper support plate and the lower support plate are fixedly connected by a second double-ended fastening bolt. The second double-ended fastening bolts are arranged in a straight line on both sides of the upper clamp and the lower clamp. By tightening the second double-ended fastening bolts on both sides, the upper clamp and the lower clamp can be clamped at the root of the fan blade, thus fixing the fan blade. The two ends of the second double-ended fastening bolts in a row on the same side are connected together by locking washers, thereby connecting the bolts into one piece and preventing the bolts from loosening.

[0005] In a preferred embodiment of this utility model, the lower support plate has the same diameter as the upper support plate, a through hole is provided in the center of the lower support plate, and the thickness of the lower support plate is less than that of the upper support plate, thereby effectively reducing the weight of the lower support plate, which is beneficial to reducing the weight of the entire wheel hub and reducing production costs.

[0006] As a preferred embodiment of this utility model, both ends of the second double-ended fastening bolt are threadedly fitted with a first nut and a second nut, and the locking washer is clamped and fixed between the first nut and the second nut, wherein the thickness of the first nut is greater than the thickness of the second nut.

[0007] As a preferred embodiment of this utility model, the stop washer is provided with through holes evenly spaced, and the second double-headed fastening bolts are inserted into the through holes one by one. The two ends of the stop washer are respectively provided with bending grooves. The edge of the stop washer can be bent through the bending grooves so that it covers the first nut and the second nut, thereby preventing the nuts from loosening.

[0008] As a preferred embodiment of this utility model, the lower clamp has an arc-shaped structure in the middle and a positioning screw hole is provided at its bottom. The clamp positioning bolt is threaded into the positioning screw hole. The structure of the upper clamp is the same as that of the lower clamp.

[0009] The beneficial effects of this utility model are as follows: This utility model uses an upper and lower support plate combined with upper and lower clamps to fix the wind turbine blades, forming a closed installation structure. The blade root is wrapped in a ring, improving installation reliability. The thicker upper support plate ensures the overall structural strength, while the lower support plate, as an auxiliary support for the blades, effectively improves overall rigidity and avoids flexural deformation during high-speed operation. By reducing the thickness of the lower support plate and opening a hole in the center, the overall structural weight is effectively reduced while maintaining structural strength, thereby reducing production costs and decreasing the overall rotational inertia of the hub. Replacing the original U-bolts with clamp structures, along with double-headed fastening bolts on both sides, clamps and fixes the wind turbine blades. This not only avoids the problem of U-bolts easily breaking at bending points but also distributes the aerodynamic axial force, residual unbalanced force, and centrifugal force during blade operation, improving the wind turbine's operational safety factor. The double-ended fasteners are connected and fixed by retaining washers. The retaining washers have grooves, which can be bent along the grooves after installation to cover the nuts of the double-ended fasteners, thus preventing loosening and ensuring the connection stability of the double-ended fasteners. Attached Figure Description

[0010] Figure 1 This is a front view of the overall structure of this utility model;

[0011] Figure 2 This is a top view of the overall structure of this utility model;

[0012] Figure 3 This is a partial sectional view of the fan blade fixing part of this utility model;

[0013] Figure 4 These are the front and top views of the lower clamp of this utility model;

[0014] Figure 5 This is a schematic diagram of the lower support plate structure of this utility model;

[0015] Figure 6 This is a schematic diagram of the stop washer structure of this utility model.

[0016] In the diagram: 1. Coupling; 2. Coupling bolt; 3. Upper support plate; 4. First double-ended fastening bolt; 5. Lower support plate; 501. Through hole; 6. Support sleeve; 7. Second double-ended fastening bolt; 701. First nut; 702. Second nut; 8. Stop washer; 801. Through hole; 802. Bent groove; 9. Upper clamp; 10. Lower clamp; 1001. Positioning screw hole; 11. Clamp positioning bolt; 12. Fan blade. Detailed Implementation

[0017] Example 1

[0018] like Figures 1 to 6 As shown, this utility model is a non-uniform thickness double-plate hub for an axial flow fan. The coupling 1 is the connecting component between the entire hub and the fan reducer. The coupling 1 is fixedly connected to the center position of the upper surface of the upper support plate 3 by coupling bolts 2. A lower support plate 5 is fixedly connected to the upper support plate 3 by first double-headed fastening bolts 4. The first double-headed fastening bolts 4 are evenly distributed circumferentially on the upper support plate 3 and the lower support plate 5. The coupling 1, the upper support plate 3, and the lower support plate 5 are coaxial. A support sleeve 6 is inserted through the middle of the head fastening bolt 4. The two ends of the support sleeve 6 press against the upper support plate 3 and the lower support plate 5 respectively, thereby supporting the upper support plate 3 and the lower support plate 5 and preventing the middle of them from being concave and deformed. The lower support plate 5 has the same diameter as the upper support plate 3. A through hole 501 is opened in the center of the lower support plate 5. The thickness of the lower support plate 5 is less than the thickness of the upper support plate 3, thereby effectively reducing the weight of the lower support plate 5, which is conducive to reducing the weight of the entire wheel hub and reducing production costs.

[0019] The lower surface of the upper support plate 3 is fixedly connected to an upper clamp 9 by clamp positioning bolts 11. The upper clamps 9 are evenly distributed circumferentially on the upper support plate 3. The upper surface of the lower support plate 5 is fixedly connected to a lower clamp 10 by clamp positioning bolts 11. The lower clamps 10 correspond one-to-one with the upper clamps 9. The lower clamp 10 has an arc-shaped structure in the middle and a positioning screw hole 1001 is opened at its bottom. The clamp positioning bolts 11 are threaded into the positioning screw holes 1001. The structure of the upper clamp 9... The structure is the same as that of the lower clamp 10. The fan blades 12 of the axial flow fan are clamped and fixed between the upper clamp 9 and the lower clamp 10. A second double-ended fastening bolt 7 is fixedly connected between the upper support plate 3 and the lower support plate 5. The second double-ended fastening bolts 7 are arranged in a straight line on both sides of the upper clamp 9 and the lower clamp 10. By tightening the second double-ended fastening bolts 7 on both sides, the upper clamp 9 and the lower clamp 10 can be clamped at the root of the fan blades 12, thus fixing the fan blades 12. The two ends of a row of second double-ended fastening bolts 7 on the same side are connected together by locking washers 8, thereby connecting the bolts into one piece and preventing the bolts from loosening. The second double-ended fastening bolt 7 has a first nut 701 and a second nut 702 threadedly fitted at both ends. The locking washer 8 is clamped and fixed between the first nut 701 and the second nut 702. The thickness of the first nut 701 is greater than the thickness of the second nut 702. The locking washer 8 has through holes 801 evenly spaced on it. The second double-ended fastening bolt 7 is inserted into the through holes 801 one by one. The locking washer 8 has bending slots 802 at both ends. The edge of the locking washer 8 can be bent through the bending slots 802 to cover the first nut 701 and the second nut 702, thereby preventing the nuts from loosening.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" 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; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through the specific circumstances.

[0022] Components not described in detail in this article are existing technologies.

[0023] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A non-equal-thickness double-web plate hub for an axial flow fan, comprising a coupling (1) fixedly connected to the center position of the upper surface of an upper web plate (3) by a coupling bolt (2), characterized in that, The upper support plate (3) is fixedly connected to the lower support plate (5) by the first double-headed fastening bolt (4). The first double-headed fastening bolt (4) is evenly arranged in a circle on the upper support plate (3) and the lower support plate (5). The coupling (1), the upper support plate (3) and the lower support plate (5) are coaxial. A support sleeve (6) is inserted through the middle of the first double-headed fastening bolt (4). The two ends of the support sleeve (6) press against the upper support plate (3) and the lower support plate (5) respectively. The lower surface of the upper support plate (3) is fixedly connected to the upper clamp (9) by the clamp positioning bolt (11). (9) are evenly arranged in a circle on the upper support plate (3). The lower support plate (5) is fixedly connected to the upper surface by the clamp positioning bolt (11) with a lower clamp (10). The lower clamp (10) corresponds one-to-one with the upper clamp (9). The upper support plate (3) and the lower support plate (5) are fixedly connected with a second double-headed fastening bolt (7). The second double-headed fastening bolts (7) are arranged in a straight line on both sides of the upper clamp (9) and the lower clamp (10). The two ends of a row of second double-headed fastening bolts (7) on the same side are connected together by a stop washer (8).

2. A non-uniform thickness double-webbed plate hub for an axial flow fan as defined in claim 1, wherein: The lower support plate (5) has the same diameter as the upper support plate (3), and the lower support plate (5) has a through hole (501) in the center. The thickness of the lower support plate (5) is less than the thickness of the upper support plate (3).

3. A non-uniform thickness double-plate hub for an axial flow fan according to claim 1, characterized in that: The second double-ended fastening bolt (7) has a first nut (701) and a second nut (702) threadedly fitted at both ends. The stop washer (8) is clamped and fixed between the first nut (701) and the second nut (702). The thickness of the first nut (701) is greater than the thickness of the second nut (702).

4. A non-uniform thickness double-plate hub for an axial flow fan according to claim 1, characterized in that: The stop washer (8) is provided with through holes (801) evenly distributed, and the second double-headed fastening bolt (7) is inserted into the through holes (801) one by one. The two ends of the stop washer (8) are respectively provided with bending grooves (802).

5. A non-uniform thickness double-plate hub for an axial flow fan according to claim 1, characterized in that: The lower clamp (10) has an arc-shaped structure in the middle and a positioning screw hole (1001) is provided at its bottom. The clamp positioning bolt (11) is threaded into the positioning screw hole (1001). The structure of the upper clamp (9) is the same as that of the lower clamp (10).

6. A non-uniform thickness double-plate hub for an axial flow fan according to claim 1, characterized in that: The fan blades (12) of the axial flow fan are clamped and fixed between the upper clamp (9) and the lower clamp (10).

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