Axial flow fan with plastic fan blades

Abstract

This utility model discloses an axial flow fan with plastic blades, including a frame, an impeller and blades rotatably mounted within the frame, a ratchet at the root of the blades, the ratchet mounted on the side of the impeller, a limiting tooth on the side of the impeller, the limiting tooth engaging with the ratchet to adjust and lock the tilt angle of the blades, a mounting post on the side of the impeller, the limiting tooth mounted on the mounting post, mounting blocks at both ends of the mounting post, a torsion spring inside the limiting tooth, the two ends of the torsion spring being located within the mounting blocks to maintain the engagement state between the limiting tooth and the ratchet, adjacent teeth on the ratchet forming a limiting groove, the side of the limiting tooth matching the limiting groove to limit the ratchet, a filter plate and a screen at the air inlet and outlet of the frame respectively, through the engagement of the ratchet and the limiting tooth, the tilt position of the blades can be adjusted, thereby achieving adjustable airflow of the axial flow fan and improving the practicality of the axial flow fan.

Description

Technical Field

[0001] This utility model belongs to the field of axial flow fan technology, and particularly relates to axial flow fans with plastic fan blades. Background Technology

[0002] Axial flow fans are one of the important industrial products in the national economy. They play a vital role in ventilation, cooling, and gas exchange in factories, mines, traffic tunnels, vehicles, ships, and buildings in both industrial and residential fields. For example, a textured axial flow fan blade and fan with patent publication number CN221879786U achieves adjustable blade angles to adapt to different needs. The raised design on the blade surface reduces noise and increases efficiency, while also achieving uniform airflow distribution and improving versatility and practicality. However, the blade adjustment angle is relatively small, which is not convenient for meeting the airflow requirements under different working conditions in actual use. Utility Model Content

[0003] The purpose of this invention is to solve the above-mentioned technical problems existing in the prior art and to provide an axial flow fan with plastic blades, which can achieve adjustable blade tilt angle.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] An axial flow fan with plastic blades, comprising a frame, an impeller and blades rotatably disposed within the frame, characterized in that:

[0006] A ratchet is provided at the root of the blade. The ratchet is installed on the side of the impeller. A limiting tooth is provided on the side of the impeller. The limiting tooth cooperates with the ratchet to adjust and lock the tilt angle of the blade.

[0007] Furthermore, the impeller side is provided with a mounting post, the limiting tooth is provided on the mounting post, the two ends of the mounting post are respectively provided with mounting blocks, the limiting tooth is provided with a torsion spring, and the two ends of the torsion spring are provided in the mounting blocks to maintain the meshing state of the limiting tooth and the ratchet.

[0008] Furthermore, adjacent teeth on the ratchet form a limiting groove, and the side of the limiting tooth matches the limiting groove to limit the ratchet.

[0009] Furthermore, the air inlet and outlet ends of the frame are respectively equipped with filter plates and screens.

[0010] Furthermore, the filter plate is located inside the mounting ring, which is secured to the end of the frame by screws.

[0011] Furthermore, the side of the mesh is provided with a connecting rod, and there are limiting blocks on both sides of the connecting rod. The end of the frame is provided with a connecting hole, and there are through grooves on both sides of the inner wall of the connecting hole. After the connecting rod is inserted into the connecting hole, it is rotated to make the limiting blocks and the through grooves misaligned, thereby realizing the connection between the mesh and the frame.

[0012] Furthermore, a top plate and a spring are provided inside the connecting hole. The two ends of the spring are connected to the top plate and the inner wall of the connecting hole, respectively. An anti-slip pad is provided on the top plate, which abuts against the end of the connecting rod to fix the connecting rod.

[0013] Furthermore, the blades are designed with curved surfaces.

[0014] Furthermore, the blades are manufactured using an injection molding process.

[0015] Furthermore, the blades and ratchet are integrally injection molded.

[0016] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0017] 1. In this utility model, the tilt position of the blades can be adjusted by the cooperation of the ratchet and the limiting tooth, thereby making the air volume of the axial flow fan adjustable and improving the practicality of the axial flow fan.

[0018] 2. In this utility model, by integrally injection molding the blade and ratchet, the weight of the blade and ratchet is reduced, preventing them from affecting the impeller's ability to drive the blade to rotate.

[0019] 3. In this utility model, the filter plate and the cover screen are detachable by means of connecting rods and screws, and the tilt angle of the blades can be adjusted. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a three-dimensional structural diagram of the axial flow fan with plastic blades according to this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of the axial flow fan with plastic blades according to this utility model;

[0023] Figure 3 This is a three-dimensional structural diagram of the blade in this utility model;

[0024] Figure 4 This is a three-dimensional structural diagram of the blade in this utility model;

[0025] Figure 5 This is a three-dimensional structural diagram of the ratchet in this utility model;

[0026] Figure 6 This is a three-dimensional cross-sectional schematic diagram of the axial flow fan of this utility model;

[0027] Figure 7 for Figure 5 Enlarged schematic diagram of a local structure at point A;

[0028] Figure 8 for Figure 6 Enlarged schematic diagram of the local structure at point B.

[0029] In the diagram: 1-Frame; 2-Impeller; 3-Blade; 4-Ratchet; 5-Limiting tooth; 6-Mounting post; 7-Mounting block; 8-Torsion spring; 9-Limiting groove; 10-Filter plate; 11-Cover screen; 12-Mounting ring; 13-Screw; 14-Connecting rod; 15-Limiting block; 16-Connecting hole; 17-Through groove; 18-Top plate; 19-Spring; 20-Anti-slip pad. Detailed Implementation

[0030] Example 1:

[0031] like Figures 1 to 7 As shown, this utility model is an axial flow fan with plastic blades, including a frame 1, an impeller 2 and blades 3 rotatably disposed within the frame 1, a ratchet 4 at the root of the blades 3, the ratchet 4 being installed on the side of the impeller 2, and a limiting tooth 5 on the side of the impeller 2, the limiting tooth 5 cooperating with the ratchet 4 to adjust and lock the tilt angle of the blades 3.

[0032] The impeller 2 has a mounting post 6 on its side, a limiting tooth 5 on the mounting post 6, and mounting blocks 7 at both ends of the mounting post 6. A torsion spring 8 is provided inside the limiting tooth 5, and the two ends of the torsion spring 8 are located inside the mounting blocks 7 to maintain the meshing state between the limiting tooth 5 and the ratchet 4.

[0033] A power source is installed inside the frame 1 via a bracket. The impeller 2 is mounted on the power source and is driven to rotate by the power source. Several blades 3 are evenly arranged on the side of the impeller 2. The rotation of the impeller 2 and the blades 3 by the power source is a well-known technical solution to those skilled in the art and will not be described in detail here.

[0034] Frame 1 is fixedly installed inside the mounting bracket.

[0035] A support frame is fixedly installed on one side of the ratchet 4, and the root of the blade 3 is fixedly installed on the top surface of the support. A connecting post is fixedly installed on the other side of the ratchet 4. The ratchet 4 is rotatably installed on the side of the impeller 2 through the connecting post, thereby enabling the blade 3 to be rotatably installed on the side of the impeller 2.

[0036] An mounting column 6 is fixedly installed on the side of the impeller 2, and mounting blocks 7 are fixedly installed at both ends of the mounting column 6. The end of the limiting tooth 5 is rotatably installed on the mounting column 6 and located between the two mounting blocks 7. A torsion spring 8 is provided in the middle of the limiting tooth 5, and the two ends of the torsion spring 8 are fixedly inserted into the fixing blocks on both sides for limiting and fixing the limiting tooth 5.

[0037] The adjacent teeth on the ratchet 4 form a limiting groove 9, and the side of the limiting tooth 5 is adapted to the limiting groove 9 to limit the ratchet 4.

[0038] The limiting tooth 5 is L-shaped, and the adjacent teeth on the ratchet 4 form a limiting groove 9. The end of the limiting tooth 5 is adapted to the limiting groove 9. The end of the limiting tooth 5 is located in the limiting groove 9 to limit and fix the ratchet 4 and prevent the ratchet 4 from rotating.

[0039] Blade 3 features a curved design to increase the airflow of the axial fan while reducing noise and energy consumption.

[0040] Blade 3 is made by injection molding.

[0041] The blade 3 and the ratchet 4 are integrally injection molded.

[0042] The blade 3, ratchet 4, support frame and connecting column are injection molded as one piece. By using plastic material, the weight of the mechanism can be reduced so as not to affect the rotation effect of the power source driving the impeller 2 and blade 3.

[0043] Working principle: When the tilt angle of blade 3 needs to be adjusted, rotate the limiting tooth 5 outward so that the end of the limiting tooth 5 disengages from the ratchet 4 so that the ratchet 4 can rotate. At the same time, the torsion spring 8 deforms. The rotation of the ratchet 4 adjusts the angle of blade 3, changes the air volume of the fan to meet the usage requirements. After adjustment, loosen the fixing of the limiting tooth 5. Through the setting of the torsion spring 8, the limiting tooth 5 is locked back into the ratchet 4, fixing the ratchet 4 and blade 3.

[0044] Example 2:

[0045] like Figure 8 As shown, the air inlet end and the air outlet end of the frame 1 are respectively provided with a filter plate 10 and a cover mesh 11.

[0046] A filter plate 10 is installed outside the air inlet of the frame 1. The filter plate 10 has several holes evenly arranged on it. The filter plate 10 prevents debris from being drawn into the fan and affecting the normal operation of the fan. A cover net 11 is installed at the air inlet of the frame 1. The cover net 11 protects the staff and prevents the blades 3 from causing injury to the workers when they rotate.

[0047] The filter plate 10 is located inside the mounting ring 12, which is attached to the end of the frame 1 by screws 13.

[0048] The mounting ring 12 is fixedly installed on the frame 1 by using screw 13.

[0049] The mesh cover 11 is provided with a connecting rod 14 on the side, and a limiting block 15 is provided on both sides of the connecting rod 14. The end of the frame 1 is provided with a connecting hole 16, and a through groove 17 is provided on both sides of the inner wall of the connecting hole 16. After the connecting rod 14 is inserted into the connecting hole 16, it is rotated to make the limiting block 15 and the through groove 17 misaligned, thereby realizing the connection between the mesh cover 11 and the frame 1.

[0050] A top plate 18 and a spring 19 are provided inside the connecting hole 16. The two ends of the spring 19 are connected to the top plate 18 and the inner wall of the connecting hole 16, respectively. An anti-slip pad 20 is provided on the top plate 18. The anti-slip pad 20 abuts against the end of the connecting rod 14 to fix the connecting rod 14.

[0051] A connecting plate is fixedly installed on the side of the cover 11, and the connecting rod 14 is movably installed on the connecting plate to support the connecting rod 14. At the same time, limit blocks 15 are symmetrically fixed on both sides of the movable end of the connecting rod 14 to prevent the connecting rod 14 from slipping off the connecting plate.

[0052] The end face of the frame 1 is provided with a connecting hole 16 corresponding to the position of the connecting rod 14, and through grooves 17 are provided on both sides of the connecting hole 16, so that the connecting rod 14 and the limiting block 15 can be inserted into the connecting hole 16. By rotating the connecting hole 16, the limiting block 15 and the through groove 17 are misaligned, thereby fixing the connecting rod 14.

[0053] A spring 19 is installed inside the connecting hole 16. The two ends of the spring 19 are fixedly connected to the inner wall of the connecting hole 16 and the top plate 18, respectively. An anti-slip pad 20 is fixedly installed on the outer side of the top plate 18. After the connecting rod 14 is inserted into the connecting hole 16, it compresses the spring 19. At the same time, the anti-slip plate on the top plate 18 abuts against the connecting rod 14. The spring 19 and the anti-slip pad 20 limit the connecting rod 14 and prevent the connecting rod 14 from rotating, which would cause the cover net 11 to be unstable during installation.

[0054] Working principle: The connecting rod 14 can be pushed into the connecting hole 16, then rotated and pulled outward to disengage the connecting rod 14 from the connecting hole 16, thereby disassembling the cover screen 11. The filter screen can be disassembled by removing the screw 13, which facilitates cleaning of the filter screen and the cover screen 11. At the same time, the tilt angle of the blade 3 can be adjusted.

[0055] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. An axial flow fan with plastic blades, comprising a frame, an impeller and blades rotatably disposed within the frame, characterized in that: A ratchet is provided at the root of the blade, the ratchet is installed on the side of the impeller, and a limiting tooth is provided on the side of the impeller. The limiting tooth cooperates with the ratchet to adjust and lock the tilt angle of the blade.

2. The axial flow fan with plastic blades according to claim 1, characterized in that: The impeller has a mounting post on its side, the limiting tooth is mounted on the mounting post, the mounting post has mounting blocks at both ends, the limiting tooth has a torsion spring inside, and the two ends of the torsion spring are located inside the mounting blocks to maintain the engagement state between the limiting tooth and the ratchet.

3. The axial flow fan with plastic blades according to claim 1, characterized in that: The adjacent teeth on the ratchet form a limiting groove, and the side of the limiting tooth is adapted to the limiting groove to limit the ratchet.

4. The axial flow fan with plastic blades according to claim 1, characterized in that: The frame is equipped with a filter plate and a cover mesh at the air inlet and air outlet ends, respectively.

5. The axial flow fan with plastic blades according to claim 4, characterized in that: The filter plate is disposed inside the mounting ring, which is fixed to the end of the frame by screws.

6. The axial flow fan with plastic blades according to claim 4, characterized in that: The mesh cover is provided with a connecting rod on its side, and a limiting block is provided on both sides of the connecting rod. The end of the frame is provided with a connecting hole, and a through groove is provided on both sides of the inner wall of the connecting hole. After the connecting rod is inserted into the connecting hole, it is rotated to make the limiting block and the through groove misaligned, thereby realizing the connection between the mesh cover and the frame.

7. The axial flow fan with plastic blades according to claim 6, characterized in that: A top plate and a spring are provided inside the connecting hole. The two ends of the spring are connected to the top plate and the inner wall of the connecting hole, respectively. An anti-slip pad is provided on the top plate, and the anti-slip pad abuts against the end of the connecting rod to fix the connecting rod.

8. The axial flow fan with plastic blades according to claim 1, characterized in that: The blades are designed with curved surfaces.

9. The axial flow fan with plastic blades according to claim 1, characterized in that: The blades are manufactured using an injection molding process.

10. The axial flow fan with plastic blades according to claim 1, characterized in that: The blade and ratchet are integrally injection molded.

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