Axial flow impeller portable fastening structure

Abstract

This utility model discloses a convenient fastening structure for an axial flow impeller, relating to the field of fan technology. It includes a fan blade, a mounting base, and a clamp. The fan blade has a connecting handle at the end of its long shaft. On one end face of the mounting base near its outer periphery, several evenly spaced shaft-embracing openings are formed around the axis of the mounting base. These openings are recessed towards the other end face of the mounting base and laterally penetrate the outer periphery of the mounting base, forming a semi-enclosed recessed cavity. A clamp is detachably connected to the upper side of each shaft-embracing opening. The middle part of the clamp bends away from the recessed cavity of the shaft-embracing opening. The lower side of the bent part of the clamp and the recessed cavity of the shaft-embracing opening together form a cylindrical cavity laterally connected to the circumferential surface of the mounting base. The connecting handle is embedded and accommodated within this cavity, and is fixed by the abutment of the cylindrical cavity surface. This utility model's installation structure facilitates the replacement and adjustment of individual fan blades, effectively reducing installation and maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, specifically a convenient fastening structure for an axial flow impeller. Background Technology

[0002] In existing technologies, the blades on the impellers of axial flow fans are mostly fixed to the impeller base by welding. Once fixed, the blade angle is not adjustable, making it impossible to adjust the airflow by adjusting the blade tilt angle during subsequent use. Welding requires high-precision welding techniques to ensure the welded parts are free of defects, preventing the balance weight from falling off and damaging the fan during operation. Furthermore, the welding angle and position of the blades must be controlled to maintain dynamic balance during fan rotation and prevent blade breakage due to uneven dynamic load. Additionally, impellers with welded blades cannot be easily disassembled and repaired when blades are damaged. Replacing the entire impeller would incur high costs. Therefore, there is a need to design an axial flow fan impeller with adjustable blade angles and the ability to easily assemble and disassemble any blade. Utility Model Content

[0003] To address the problems mentioned in the background section regarding the inability to adjust the blade angle of existing welded axial flow impellers and the inconvenience of blade replacement and maintenance, a convenient fastening structure for axial flow impellers is proposed, which facilitates the adjustment and replacement of fan blades.

[0004] This utility model discloses a convenient fastening structure for an axial flow impeller, comprising a fan blade, a mounting base, and a clamp. The fan blade has a connecting handle at the end of its long shaft. On one end face of the mounting base near the outer periphery, several evenly spaced shaft-embracing openings are formed around the axis of the mounting base. The shaft-embracing openings are recessed towards the other end face of the mounting base and laterally penetrate the outer periphery of the mounting base to form a semi-enclosed recessed cavity. A clamp is detachably connected to the upper side of each shaft-embracing opening. The middle part of the clamp is bent towards the recessed cavity opposite to the shaft-embracing opening. The lower side of the bent part of the clamp and the recessed cavity of the shaft-embracing opening together form a cylindrical cavity that laterally communicates with the circumferential surface of the mounting base. The connecting handle is embedded and accommodated in the cavity and is fixed by the abutment of the cylindrical cavity surface.

[0005] As a further improvement of this utility model, the cross-sectional shape of the shaft inlet and the clamp is semi-circular; the diameter of the recessed cavity of the shaft inlet away from the center of the mounting base is narrower than the diameter of the recessed cavity near the center of the mounting base, and a stepped structure is formed on the surface of the recessed cavity, the interface of the stepped structure is the abutment surface of the shaft inlet; the diameter of the curved part of the clamp away from the center of the mounting base is narrower than the other side, and a stepped structure is also formed on the lower side of the curved part, the interface of the stepped structure is the abutment surface of the clamp; the diameter of the connecting handle away from the fan blade is larger than the diameter near the fan blade, forming a stepped structure, the interface of the stepped structure is the abutment surface of the connecting handle, and the connecting handle in the installed state, the abutment surface of the connecting handle abuts against the abutment surface of the shaft inlet and the abutment surface of the clamp, respectively, to restrict the axial movement of the connecting handle.

[0006] As a further improvement of this utility model, the recessed cavity with a larger diameter of the shaft inlet and the curved part with a larger diameter of the clamp both taper towards the center of the mounting base, and the end of the connecting handle with a larger diameter has a matching tapered sidewall; in the embedded state, the tapered surface of the connecting handle abuts against the tapered contraction surface of the shaft inlet and the clamp, and the end face of the connecting handle abuts against and is fixed to the end face of the recessed cavity of the shaft inlet.

[0007] As a further improvement of this utility model, it also includes a pad, which fits against the end face of the mounting base with the insertion opening and is sandwiched between the mounting base and the clamp; the outer ring of the pad has a clearance notch corresponding to each insertion opening on the mounting base.

[0008] As a further improvement of this utility model, a hoop through groove is provided in the middle section of the curved part of the hoop, which is located on the lower side parallel to the hoop abutment surface of the stepped structure. The hoop through groove extends with the curvature of the curved part and horizontally penetrates the middle section of the hoop.

[0009] As a further improvement of this utility model, a recessed adjustment hole is provided on the surface of the shaft section with a smaller diameter connecting handle. The adjustment hole is located on the lower side of the connecting handle abutment surface. In the installation state, the adjustment hole is horizontally aligned with the clamp through groove.

[0010] As a further improvement of this utility model, both sides of the curved part of the clamp have fixing ears that fit the end face of the shaft opening, and the fixing ears are connected to the mounting base screws.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model uses a separate clamp to detachably press and fix the blade handle of a single fan blade. Compared with the welding fixing method used in traditional technology, it can realize the individual disassembly and replacement of the fan blade, which is convenient for later maintenance. In addition, the screw connection installation method of the clamp is more convenient than the welding process, which can effectively reduce the installation and maintenance costs.

[0013] 2. The clamp has a clamp through groove, which, together with the adjustment hole on the fan blade connecting handle, allows the adjustment of the fan blade tilt angle by inserting a tool through the clamp through groove and abutting the adjustment hole without disassembling the clamp, thus facilitating the adjustment of the fan blade angle during use. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the fan blade of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the clamp of this utility model;

[0018] Figure 5 A schematic diagram of the structure of the clamp with a through groove in this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the mounting base of this utility model;

[0020] Figure 7 This is a cross-sectional structural diagram of the present invention during assembly;

[0021] 1. Fan blade; 11. Connecting handle; 111. Connecting handle abutment surface; 112. Adjustment hole; 2. Mounting base; 21. Shaft insertion port; 211. Shaft insertion port abutment surface; 3. Clamp; 31. Clamp abutment surface; 32. Fixing ear; 33. Clamp through groove; 4. Pad plate. Detailed Implementation

[0022] Specific Implementation Example 1: Please refer to the appendix Figure 1 - Appendix Figure 7 ,

[0023] A convenient fastening structure for an axial flow impeller includes a fan blade 1, a mounting base 2, a clamp 3, and a pad 4.

[0024] like Figure 3 As shown, the fan blade 1 has a cylindrical connecting handle 11 at the root of the blade, extending parallel to the long axis of the fan blade 1. The connecting handle 11 has a two-stage stepped shaft structure. The diameter of the shaft section of the connecting handle 11 near the root of the blade is smaller than the diameter of the shaft section of the connecting handle 11 away from the root of the blade. The two shaft sections with different diameters form an annular plane at the interface, which serves as the connecting handle abutment surface 111. The outer circumference of the shaft section of the connecting handle 11 away from the root of the blade is a conical slope, that is, the diameter of the shaft section gradually decreases from the connecting handle abutment surface 111 towards the end face of the connecting handle 11, and the outer circumference tapers.

[0025] like Figure 6 As shown, the mounting base 2 has a through-hole at its center for connecting the impeller drive shaft. On the outer ring portion of one end face of the mounting base 2, twelve shaft-fitting openings 21 are evenly spaced around the axis of the mounting base 2. (See diagram below.) Figure 5 As shown in the enlarged view, the shaft fitting 21 is a semi-circular recessed cavity, and the extended central axis of each shaft fitting 21 passes through the axis of the mounting base 2. The shaft fitting 21 has a two-stage stepped structure. The radius of the recessed cavity near the outer periphery of the mounting base 2 is smaller than that of the recessed cavity near the axis of the mounting base 2. The two recessed cavities with different radii form a semi-annular plane at the interface, which serves as the shaft fitting abutment surface 211. The recessed cavity with the smaller radius of the shaft fitting 21 corresponds to the shaft segment with the smaller diameter of the matching connecting handle 11; the side wall of the recessed cavity with the larger radius of the shaft fitting 21 tapers towards the center of the mounting base 2, corresponding to the conical inclined surface on the shaft segment with the larger diameter of the matching connecting handle 11.

[0026] like Figure 4 and Figure 5 As shown, the middle of the clamp 3 is a semi-circular curved section, and both ends of the curved section are provided with horizontally extending fixing ears 32. Figure 4 As shown in the side view and test sectional view, the inner side of the curved portion of the clamp 3 has a two-stage stepped structure. The radius of the semi-circular curved portion on the left is smaller than that of the semi-circular curved portion on the right. The two curved portions with different radii form a semi-annular plane at the interface, which serves as the clamp abutment surface 31. The curved portion on the left side of the clamp 3 with a smaller radius corresponds to the shaft segment with a smaller diameter of the matching connecting handle 11. The side wall of the curved portion on the right side of the clamp 3 with a larger radius tapers from the clamp abutment surface 31 to the right end face, corresponding to the conical inclined surface on the shaft segment with a larger diameter of the matching connecting handle 11.

[0027] like Figure 2 As shown, the central opening of the pad 4 corresponds to the central shaft hole of the mounting base 2, and the outer circumference of the pad 4 is provided with clearance notches corresponding to each shaft-fitting opening 21 on the mounting base 2. One side of the pad 4 is attached to the end face of the shaft-fitting opening 21 on the mounting base 2, and the other side of the pad 4 is attached to the bottom surface of the clamp 3. The pad 4 is sandwiched between the mounting base 2 and the clamp 3, and the clearance notches of the pad 4 vertically correspond to the lower shaft-fitting opening 21 and the upper curved part of the clamp 3.

[0028] During installation, such as Figure 7As shown, each mounting base 2 has a corresponding clamp 3 on its shaft inlet 21. The clamp 3 is detachably fixed to the mounting base 2 by screws on both sides. The lower side of the middle curved part of the clamp 3 and the recessed cavity of the shaft inlet 21 together form a cylindrical cavity. The connecting handle 11 of the fan blade 1 is correspondingly embedded in the cylindrical cavity. The connecting handle abutting surface 111 abuts against the shaft inlet abutting surface 211 and the clamp abutting surface 31, respectively. Under the abutting action, the axial movement of the connecting handle 11 is restricted, and it cannot slip out of the cylindrical cavity. The conical inclined surface of the larger diameter shaft section of the connecting handle 11 abuts against the conical contraction inclined surface of the larger radius recessed cavity of the mounting base 2 and the conical side wall of the larger radius curved part of the clamp 3, respectively. Under the abutting fit of the conical surfaces, the spatial position of the connecting handle 11 is fixed, ensuring that the geometric tolerance of each fan blade 1 is consistent.

[0029] Furthermore, such as Figure 3 An adjustment hole 112 is provided on the outer circumferential surface of the shaft section near the blade root of the connecting handle 11 shown, in a direction perpendicular to the blade surface; as shown Figure 5 As shown, a clamp through groove 33 is provided in the middle section of the curved part of the clamp 3. It is located on the lower side of the clamp abutment surface 31 of the stepped structure, and the clamp through groove 33 extends with the curvature of the curved part and horizontally penetrates the middle section of the clamp 3.

[0030] Operating principle: After the connecting handle 11 is embedded in the shaft inlet 21 and locked by the clamp 3, the adjustment hole 112 on the connecting handle 11 corresponds to the clamp through groove 33 of the clamp 3. When adjusting the angle of the fan blade 1, simply loosen the screw connection of the clamp 3, and a rod-shaped tool can be inserted into the clamp through groove 33 and engaged with the adjustment hole 112. The connecting handle 11 can be rotated by the rod-shaped tool to adjust the tilt angle of the fan blade 1, avoiding complete disassembly of the clamp 3 and simplifying the adjustment steps.

[0031] The above description is only a preferred embodiment of the present utility model and is intended to illustrate the principle and effect of the present utility model, and is not intended to limit the present utility model. All variations, modifications and substitutions within the spirit and principle of the present design are within the protection scope of the present utility model.

Claims

1. A portable fastening structure of an axial flow impeller, characterized by: Includes fan blades (1), mounting base (2), and clamp (3); The fan blade (1) has a connecting handle (11) at the end of the long shaft. On one end face of the mounting base (2) near the outer periphery, there are several evenly spaced shaft-embedding openings (21) around the axis of the mounting base (2). The shaft-embedding openings (21) are recessed towards the other end face of the mounting base (2) and laterally penetrate the outer periphery wall of the mounting base (2) to form a semi-enclosed recessed cavity. Each shaft inlet (21) is fixed with a detachable clamp (3) on its upper side; the middle part of the clamp (3) bends toward the recessed cavity of the shaft inlet (21), and the lower side of the bent part of the clamp (3) and the recessed cavity of the shaft inlet (21) together form a cylindrical cavity on the circumferential surface of the mounting base (2) that is laterally connected, and the connecting handle (11) is embedded and accommodated therein, and is fixed by the abutment of the cylindrical cavity surface.

2. A portable fastening structure of an axial flow impeller according to claim 1, characterized in that: The cross-sectional shape of the shaft inlet (21) and the clamp (3) is semi-circular; the diameter of the recessed cavity of the shaft inlet (21) away from the center of the mounting base (2) is narrower than the diameter of the recessed cavity near the center of the mounting base (2), and a stepped structure is formed on the surface of the recessed cavity. The interface of the stepped structure is the shaft inlet abutment surface (211); the diameter of the curved part of the clamp (3) away from the center of the mounting base (2) is narrower than the other side, and a stepped structure is also formed on the lower side of the curved part. The interface of the stepped structure is the clamp abutment surface (31); the diameter of the end of the connecting handle (11) away from the fan blade (1) is larger than the diameter of the end near the fan blade (1), forming a stepped structure. The interface of the stepped structure is the connecting handle abutment surface (111). In the installed state, the connecting handle (111) abuts against the shaft inlet abutment surface (211) and the clamp abutment surface (31) respectively to restrict the axial movement of the connecting handle (11).

3. A portable fastening structure of an axial flow impeller according to claim 2, characterized in that: The recessed cavity with a larger diameter of the shaft inlet (21) and the curved part with a larger diameter of the clamp (3) both taper towards the center of the mounting base (2). The end with a larger diameter of the connecting handle (11) has a matching tapered sidewall. When in the in-set state, the tapered surface of the connecting handle (11) abuts against the tapered contraction surface of the shaft inlet (21) and the clamp (3), and the end face of the connecting handle (11) abuts against and is fixed to the end face of the recessed cavity of the shaft inlet (21).

4. The axial impeller convenient fastening structure according to claim 1, characterized in that: It also includes a pad (4), which fits the end face of the mounting seat (2) with the shaft inlet (21) on one side and is sandwiched between the mounting seat (2) and the clamp (3); the outer ring of the pad (4) has a clearance notch corresponding to each shaft inlet (21) on the mounting seat (2).

5. The convenient fastening structure for an axial flow impeller according to claim 2, characterized in that: The middle section of the bent part of the clamp (3) is provided with a clamp through groove (33), which is located on the lower side parallel to the clamp abutment surface (31) of the stepped structure. The clamp through groove (33) extends with the curvature of the bent part and horizontally penetrates the middle section of the clamp (3).

6. A convenient fastening structure of an axial flow impeller according to claim 5, characterized in that: The smaller diameter shaft section of the connecting handle (11) has a recessed adjustment hole (112). The adjustment hole (112) is located on the lower side of the connecting handle abutment surface (111). In the installation state, the adjustment hole (112) corresponds horizontally to the clamp through groove (33).

7. The axial impeller portable fastening structure according to claim 1, characterized in that: The bending part of the hoop (3) has a fixed lug (32) on both sides, which is in contact with the end face of the shaft insertion port (21), and the fixed lug (32) is screw-connected with the mounting base (2).

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