Axial flow construction fan impeller with adjustable blades

Abstract

The present invention relates to the technical field of axial flow fans, and specifically discloses an axial flow construction fan impeller with adjustable blades, comprising a hub, a hub disc, and a plurality of blades, wherein the plurality of blades are evenly distributed around the hub, a mounting groove is provided on the side wall of the hub, a plurality of annularly distributed clamping grooves are provided on the inner side wall of the mounting groove, a mounting seat adapted to the mounting groove is provided at the lower end of the blade, a clamping block adapted to the clamping groove is provided on the side wall of the mounting seat, a rotating shaft is provided on the bottom surface of the mounting seat, a transmission assembly is movably connected to the lower end of the rotating shaft, the hub disc is movably connected to the hub, and the axial force generated by the relative rotation of the hub disc and the hub drives the blade upward through the transmission assembly until the clamping block is disengaged from the clamping groove, and then the angle of the blade is adjusted. The blade angle adjustment error of the present invention is small, and can ensure that the adjustment inclination angle of each blade is consistent, thereby ensuring the normal operation of the axial flow fan.

Description

Technical Field

[0001] The invention relates to the technical field of axial flow fans, and in particular to an axial flow construction fan impeller with adjustable blades. Background Art

[0002] Axial flow fans have a wide range of uses and are often used in various places that require cooling and ventilation. The blades of the impellers in existing fans are either integrally formed with the hub or fixedly mounted on the hub. Regardless of the method, once the processing is completed, the blade angle cannot be changed. Therefore, a finished impeller can only meet the use requirements of one working condition. In actual use, due to the complex working environment, the required ventilation volume and wind pressure are also different. In order to ensure that the fan is in the best working condition, it is also necessary to use an impeller with appropriate parameters. Not only is the equipment replacement troublesome, but it also increases the cost burden and reduces the effective use of the machine.

[0003] Most of the existing technologies adapt to different working conditions by changing the blade angle. There are two forms of blade angle adjustment: dynamic and static. Dynamic adjustment refers to adjustment during the operation of the fan. The mechanism of this adjustment method is relatively complex, the production cost is very high, and it is seldom used. Static adjustment refers to manual adjustment through a series of mechanisms when the fan is stationary. To adjust individual blades one by one, it is necessary to first disassemble the casing, loosen the fixing device of each blade, rotate the blades one by one to a certain angle and then lock them, and restore the fixing device to the original installation position. This adjustment method causes a large error in the blade adjustment angle, and cannot ensure that the adjustment angle of each blade is consistent, which in turn affects the normal operation of the axial flow fan. Summary of the Invention

[0004] The object of the present invention is to provide an axial flow construction fan impeller with adjustable blades, which has a small error in blade angle adjustment and can ensure that the adjustment inclination angles of each blade are consistent, thereby ensuring the normal operation of the axial flow fan.

[0005] In order to solve the above technical problems, the present invention adopts the following solutions:

[0006] An axial flow construction fan impeller with adjustable blades comprises a hub, a hub disc, and a plurality of blades, wherein the plurality of blades are evenly distributed around the hub; an assembly groove is provided on the side wall of the hub, a plurality of annularly distributed clamping grooves are provided on the inner side wall of the assembly groove, a mounting seat adapted to the assembly groove is provided at the lower end of the blade, a clamping block adapted to the clamping groove is provided on the side wall of the mounting seat, a rotating shaft is provided on the bottom surface of the mounting seat, a transmission assembly is movably connected to the lower end of the rotating shaft, the hub disc is movably connected to the hub, and the axial force generated by the relative rotation of the hub disc and the hub drives the blade to move upward through the transmission assembly until the clamping block is disengaged from the clamping groove, and then the angle of the blade is adjusted.

[0007] In this solution, a circle of assembly grooves is provided on the side wall of the hub, and a number of annularly distributed slots are provided on the inner side wall of the assembly groove. The hub provides a basic structure for the installation of the blades, and the slots are designed to cooperate with the blocks on the blades to fix the blades at a specific angle. The hub is movably connected to the hub. During the process of adjusting the blade angle, the axial force generated by the relative rotation of the hub and the hub drives the blades upward for angle adjustment. Multiple blades are evenly distributed around the hub. A mounting seat adapted to the assembly groove is provided at the lower end of the blade. The blocks on the mounting seat cooperate with the slots in the hub assembly groove to keep the blades at a fixed angle under normal working conditions. A rotating shaft is provided on the bottom surface of the mounting seat, and a transmission assembly is movably connected to the lower end of the rotating shaft. The transmission assembly transmits the axial force generated by the relative rotation of the hub and the hub to the blades, driving the blades upward. Initial fixed state: Under normal operating conditions, the blade mounting base is inserted into the assembly slot of the hub. The block on the side wall of the mounting base tightly fits the slot inside the assembly slot, firmly fixing the blade to the hub and maintaining the set angle, thereby ensuring that the fan can deliver air according to the design requirements. Angle adjustment process: When the blade angle needs to be adjusted, the operator rotates the hub relative to the wheel. This relative rotation generates an axial force, which is transmitted to the shaft on the bottom surface of the blade mounting base through the transmission assembly. Under the action of this axial force, the blade moves upward along the assembly slot. As the blade moves upward, the block on the side wall of the mounting base gradually disengages from the slot. When the block is completely disengaged from the slot, the blade loses its fixing function and the relative rotation between the hub and the wheel stops. At this time, the blade can be manually rotated to align the block on the side wall of the mounting base with the different slots to adjust the blade to the desired new angle. When the blade is adjusted to the desired angle, the block on the mounting base reengages the corresponding slot, re-fixing the blade at the new angle, and the fan can operate at the new blade angle. Since the distribution of the slots in each assembly slot is exactly the same, when adjusting the blade angle, you only need to place the block on each blade into the slot in the same position. This ensures that the inclination angle of each blade is consistent, greatly reducing the adjustment angle error, thereby ensuring the normal operation of the axial flow fan.

[0008] Optionally, the mounting seat is circular, the end face of the mounting seat is located outside the blade, and two symmetrical blocks are distributed radially on the side wall of the mounting seat.

[0009] Optionally, a clamping ring is provided on the side wall of the hub, and the clamping ring has through holes distributed circumferentially thereon corresponding to the blades, and the clamping ring presses the mounting seat into the assembly groove.

[0010] Optionally, the transmission assembly includes a transmission block, the lower end of the rotating shaft passes through the side wall of the hub and is movably connected to the transmission block, the rotating shaft and the transmission block can rotate relative to each other, and the side surface of the transmission block is in oblique straight contact with the side surface of the hub.

[0011] Optionally, a rotating cavity is provided on the top surface of the transmission block, a bearing is installed in the rotating cavity, and the lower end of the rotating shaft is connected to the inner ring of the bearing by interference fit.

[0012] Optionally, an elastic body located outside the rotating shaft is provided between the top surface of the transmission block and the inner wall of the hub.

[0013] Optionally, the elastic body is a spring or an airbag.

[0014] Optionally, an external thread is provided on the outer wall of the hub, an assembly hole adapted to the hub is provided on the side of the hub, and an internal thread adapted to the external thread is provided on the inner wall of the assembly hole.

[0015] Optionally, a driving seat for driving the hub to rotate is provided at one end of the hub away from the wheel hub, and a hemispherical cover is bolted to the driving seat, and the cover and the hub form a cone.

[0016] Optionally, the cross-section of the driving seat is a regular quadrilateral, a regular pentagon, or a regular hexagon.

[0017] The present invention has the beneficial effects:

[0018] 1. In the present invention, the angle adjustment process: When the blade angle needs to be adjusted, the operator causes the hub to rotate relative to the wheel hub. This relative rotation generates an axial force, which is transmitted to the rotating shaft on the bottom surface of the blade mounting seat through the transmission assembly. Under the action of the axial force, the blade moves upward along the assembly slot. As the blade moves upward, the retaining block on the side wall of the mounting seat gradually disengages from the retaining block. When the retaining block completely disengages from the retaining block, the blade loses its retaining function, and the relative rotation between the hub and the wheel hub stops. At this time, the blade can be manually rotated, and the retaining block on the side wall of the mounting seat is aligned with the retaining block, so that the blade reaches the desired new angle. When the blade is adjusted to the desired angle, the retaining block on the mounting seat reengages the corresponding retaining block, re-securing the blade at the new angle, and the fan can then operate at the new blade angle. Because the retaining block distribution pattern within each assembly slot is identical, the blade angle adjustment only requires placing the retaining block on each blade into the retaining block in the same position. This ensures that the inclination angle of each blade is consistent, greatly reducing the adjustment angle error, and thus ensuring the normal operation of the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a structural diagram of the blade angle adjustment process;

[0021] Figure 3 Schematic diagram of the plane distribution structure of the assembly groove on the hub;

[0022] Figure 4 This is the assembly structure diagram of the mounting seat and the clamping block;

[0023] Figure 5 Schematic diagram of the assembly structure of the bearing and the rotating shaft;

[0024] Figure 6 This is a planar structural diagram of the clamping ring.

[0025] Figure markings: 1-hub, 2-blade, 3-hub, 4-mounting seat, 5-elastomer, 6-transmission block, 7-pressure ring, 8-rotating shaft, 9-assembly hole, 10-driving seat, 11-cover, 12-assembly groove, 13-card slot, 14-card block, 15-rotating chamber, 16-bearing, 17-through hole. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 to the present invention.

[0028] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "having," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0029] A blade-adjustable axial-flow construction fan impeller comprises a hub 1, a hub disc 3, and a plurality of blades 2. The plurality of blades 2 are evenly distributed around the hub 1. The side wall of the hub 1 is provided with an assembly groove 12, and the inner side wall of the assembly groove 12 is provided with a plurality of annularly distributed card grooves 13. The lower end of the blade 2 is provided with a mounting seat 4 adapted to the assembly groove 12, and the side wall of the mounting seat 4 is provided with a card block 14 adapted to the card groove 13. The bottom surface of the mounting seat 4 is provided with a rotating shaft 8, and the lower end of the rotating shaft 8 is movably connected to a transmission assembly. The hub disc 3 is movably connected to the hub 1, and the axial force generated by the relative rotation of the hub disc 3 and the hub 1 drives the blade 2 to move upward through the transmission assembly until the card block 14 disengages from the card groove 13 to adjust the angle of the blade 2.

[0030] In this embodiment, Figure 1 As shown, the wheel hub 1 is a circular structure, and a circle of assembly grooves 12 are provided on the side wall of the wheel hub 1. A plurality of assembly grooves 12 are distributed on the wheel hub 1 in an annular manner. Figure 3 As shown, the inner wall of the assembly groove 12 has several annularly distributed slots 13. The slots 13 are equivalent to notched slots. The slots 13 are recessed toward the outside of the assembly groove 12. The mounting seat 4 can be adapted to fit into the assembly groove 12. The hub 1 provides a basic structure for the installation of the blades 2. The slots 13 are designed to cooperate with the blocks 14 on the blades 2 to fix the blades 2 at a specific angle. The hub 3 is movably connected to the hub 1. During the process of adjusting the angle of the blades 2, the axial force generated by the relative rotation of the hub 3 and the hub 1 drives the blades 2 upward for angle adjustment. Multiple blades 2 are evenly distributed around the hub 1. The lower end of the blade 2 is provided with a mounting seat 4 adapted to the assembly groove 12. The blocks 14 on the mounting seat 4 cooperate with the slots 13 in the assembly groove 12 of the hub 1, allowing the blades 2 to maintain a fixed angle under normal working conditions. A rotating shaft 8 is provided on the bottom surface of the mounting base 4. A transmission assembly is movably connected to the lower end of the rotating shaft 8. This transmission assembly transmits the axial force generated by the relative rotation of the hub 3 and the wheel hub 1 to the blades 2, driving the blades 2 upward. Under normal operating conditions, the mounting base 4 of the blades 2 is inserted into the assembly groove 12 of the wheel hub 1. The retaining blocks 14 on the side walls of the mounting base 4 tightly fit with the retaining grooves 13 on the inner wall of the assembly groove 12, securing the blades 2 to the wheel hub 1 and maintaining the set angle, thereby ensuring that the fan delivers air according to the design requirements.

[0031] like Figure 2When the blade 2 is adjusted to the appropriate angle, the block 14 on the mounting seat 4 is re-engaged in the corresponding slot 13, and the blade 2 is fixed at the new angle again, and the fan can work according to the new blade 2 angle. Since the distribution of the card slots 13 in each assembly slot 12 is exactly the same, the number of card slots 13 in each assembly slot 12 should be an even number, that is, the number, angle, and size are all the same. When adjusting the angle of the blade 2, it is only necessary to place the card block 14 on each blade 2 into the card slot 13 at the same position. In this way, it can be ensured that the inclination angle of each blade 2 is consistent, the adjustment angle error is greatly reduced, and the normal operation of the axial flow fan is ensured.

[0032] Simple structure: The angle adjustment structure of the blade 2 of the axial flow fan is relatively simple. Through the cooperation of the hub 1, the hub 3, the blade 2 and the transmission assembly, the adjustable function of the blade 2 angle is achieved, reducing the manufacturing and maintenance costs.

[0033] Easy adjustment: The operator only needs to control the relative rotation of the hub 3 and the wheel hub 1 to drive the blade 2 to move up and out of the slot 13, thereby conveniently and manually adjusting the angle of the blade 2. The operation process is relatively simple.

[0034] High reliability: The matching mode of the card slot 13 and the card block 14 can ensure the stability of the blade 2 under normal working conditions. At the same time, the design of the transmission component can also reliably transmit the axial force to the blade 2, ensuring the smooth progress of the angle adjustment process.

[0035] Adjustment accuracy: The block 14 on each blade 2 is inserted into the slot 13 at the same position in the assembly slot 12, ensuring that the inclination angle of each blade 2 is consistent, and the error of the adjustment angle is greatly reduced.

[0036] Furthermore, the mounting seat 4 is circular, the end surface of the mounting seat 4 is located outside the blade 2, and two symmetrical blocks 14 are distributed radially on the side wall of the mounting seat 4.

[0037] Specifically, such as Figure 4As shown, the mounting seat 4 is circular, which is convenient for processing and rotation. The end face of the mounting seat 4 is located outside the blade 2, which facilitates the subsequent tightening of the clamping ring 7 on the mounting seat 4 and prevents the blade 2 from interfering with the clamping ring 7. Two symmetrical clamping blocks 14 are provided on the side wall of the mounting seat 4. The two clamping blocks 14 are located at both ends of the same diameter of the mounting seat 4. This can effectively prevent the blade 2 from rotating during the operation of the fan and has a better limiting effect. The symmetrically distributed clamping blocks 14 can make the force on the mounting seat 4 more balanced when subjected to axial force or other forces. Even if one of the clamping blocks 14 breaks, the other clamping block 14 can serve as a backup limit. The clamping block 14 and the mounting seat 4 can be welded or integrally formed. When adjusting the angle of the blade 2, after the clamping block 14 is disengaged from the slot 13, the blade 2 is rotated to align with the slot 13 on the same diameter on the assembly slot 12. The hub 3 is rotated in the opposite direction, and the blade 2 moves downward to allow the clamping block 14 to engage with the slot 13, completing the angle adjustment of the blade 2. The slots 13 at both ends of the same diameter can be provided with a numerical mark, so that the worker can accurately adjust each blade 2 to the same inclination angle.

[0038] Furthermore, a clamping ring 7 is provided on the side wall of the hub 1 , and the clamping ring 7 has through holes 17 distributed circumferentially thereon corresponding to the blades 2 . The clamping ring 7 presses the mounting seat 4 into the assembly groove 12 .

[0039] Specifically, such as Figure 6 As shown, in order to prevent the blades 2 from being separated from the hub 1 during the operation of the fan, a clamping ring 7 is screwed to the hub 1. The clamping ring 7 has a through hole 17 corresponding to the blade 2 along its axial direction. The through hole 17 allows the blade 2 to pass through, but does not allow the mounting seat 4 to pass through, which is equivalent to the clamping ring 7 contacting the top surface of the mounting seat 4. Finally, the clamping ring 7 is locked to the hub 1 by screws, and countersunk screws can be used. It can also be set to two clamping rings 7, and the two clamping rings 7 are on both sides of the blade 2, and the fixed connection is still achieved by screws. When the angle of the blade 2 needs to be adjusted, the clamping ring 7 must be removed first. Compared with the existing structure in which each blade 2 has a fixing device, this solution locks multiple blades 2 on the hub 1 through a locking mechanism, which is more time-saving and labor-saving for installation and disassembly.

[0040] Furthermore, the transmission assembly includes a transmission block 6, the lower end of the rotating shaft 8 passes through the side wall of the wheel hub 1 and is movably connected to the transmission block 6, the rotating shaft 8 and the transmission block 6 can rotate relative to each other, and the side surface of the transmission block 6 is in oblique straight contact with the side surface of the hub 3.

[0041] Specifically, the shaft 8 and the transmission block 6 are flexibly connected. When the retaining block 14 is disengaged from the retaining slot 13, the blades 2 can be rotated to a desired angle. The contact surface between the transmission block 6 and the hub 3 is an oblique, vertical surface. When the hub 3 rotates toward the hub 1, the generated axial force (lateral force) pushes the transmission block 6 upward, thereby lifting the blades 2 to a certain height.

[0042] Furthermore, a rotating cavity 15 is provided on the top surface of the transmission block 6 , a bearing 16 is installed in the rotating cavity 15 , and the lower end of the rotating shaft 8 is connected to the inner ring of the bearing 16 by interference fit.

[0043] Specifically, such as Figure 5 As shown, a downwardly recessed rotating cavity 15 is provided on the top surface of the transmission block 6, and a bearing 16 is fixedly installed in the rotating cavity 15. The lower end of the rotating shaft 8 is plugged into the inner ring of the bearing 16 by an interference fit. The bearing 16 can improve the flexibility of the angle adjustment of the blade 2 in the later stage.

[0044] Furthermore, an elastic body 5 is provided between the top surface of the transmission block 6 and the inner wall of the hub 1 and is located outside the rotating shaft 8 .

[0045] Furthermore, the elastic body 5 is a spring or an airbag.

[0046] Specifically, such as Figure 1 As shown, an elastic body 5 is provided between the transmission block 6 and the inner wall of the hub 1. The elastic body 5 can be an air bag or a spring. The upper end of the elastic body 5 is connected to the inner wall of the hub 1, and the lower end is connected to the top surface of the transmission block 6. The lower end of the rotating shaft 8 passes through the elastic body 5 and is rotatably connected to the transmission block 6. There is a certain gap between the rotating shaft 8 and the elastic body 5. After the blade 2 is rotated to an appropriate position, the block 14 is aligned with the slot 13, and the elastic body 5 is in a compressed state. Then the hub 3 is rotated in the opposite direction, so that the hub 3 moves to the side away from the hub 1, and the end of the hub 3 releases the transmission block 6. The limit, under the action of the elastic potential energy stored in the elastomer 5, the initial transmission block 6 moves down along the inclined surface of the hub 3, and the worker then assists in pressing the blade 2 downward so that the block 14 is inserted into the slot 13, stopping the rotation of the hub 3, and finally installing the clamping ring 7 on the hub 1 to lock the mounting seat 4 in the assembly groove 12. The bottom surface of the assembly groove 12 is provided with a channel for allowing the rotating shaft 8 to pass through. The aperture of the channel is slightly larger than the diameter of the rotating shaft 8, but smaller than the diameter of the assembly groove 12 and the diameter of the mounting seat 4, so that the mounting seat 4 will be restricted in the assembly groove 12 and will not slip out of the channel.

[0047] Furthermore, an external thread is provided on the outer wall of the hub 3, an assembly hole 9 adapted to the hub 3 is provided on the side of the wheel hub 1, and an internal thread adapted to the external thread is provided on the inner wall of the assembly hole 9.

[0048] Specifically, the external thread on the outer wall of the hub 3 cooperates with the internal thread on the inner wall of the assembly hole 9 of the wheel hub 1, and the threaded connection has good self-locking performance. When the hub 3 is screwed into the assembly hole 9 of the wheel hub 1, the friction between the threads can effectively prevent the hub 3 and the wheel hub 1 from loosening or relative rotation. During the operation of the fan, the blades 2 will be affected by the impact of the airflow and the centrifugal force generated by the rotation, and the firm threaded connection can ensure that the hub 3 and the wheel hub 1 always remain tightly connected, ensuring the stability and reliability of the fan structure and avoiding failures or safety accidents caused by loose connections.

[0049] By controlling the depth of the hub 3 screwed into the assembly hole 9 of the hub 1, the relative position between the hub 3 and the hub 1 can be adjusted to a certain extent. This adjustability provides the basis for generating axial force during the angle adjustment of the blade 2. When the angle of the blade 2 needs to be adjusted, the hub 3 is further rotated forward or backward to change the relative position of the hub 3 and the hub 1, thereby generating the required axial force to drive the blade 2 upward and adjust the blade 2 angle.

[0050] Furthermore, a driving seat 10 for driving the hub 3 to rotate is provided at one end of the hub 3 away from the wheel hub 1 , and a hemispherical cover 11 is bolted to the driving seat 10 , and the cover 11 and the hub 3 form a cone.

[0051] Furthermore, the cross section of the driving seat 10 is a regular quadrilateral, a regular pentagon, or a regular hexagon.

[0052] Specifically, the cross-section of the drive base 10 is a regular quadrilateral, regular pentagon, or regular hexagon. Adjusting the blade 2 angle requires a tool (such as a wrench or socket) to rotate the hub 3. The polygonal drive base 10 provides multiple reliable points of engagement for the tool. For example, a wrench can easily engage the six sides of the drive base 10, allowing the operator to rotate the hub 3 more stably and with less effort. Compared to a circular or other irregular shape, the polygonal drive base 10 better transmits torque, reduces slippage during rotation, and improves the efficiency and accuracy of blade 2 angle adjustment. The cover 11 and the hub 3 form a cone. From an aerodynamic perspective, this cone reduces airflow obstruction during fan operation, lowering drag losses and improving fan efficiency. Much like the streamlined design of an airplane nose reduces air resistance, the combination of the cone-shaped cover 11 and hub 3 also ensures smoother air delivery. The cover 11 can be connected to either the drive base 10 or the hub 3.

[0053] The specific principle of the blade 2 angle adjustment of the present invention is as follows: after the fan is stopped, first remove the screws between the clamping ring 7 and the hub 1, remove the clamping ring 7, and then remove the cover 11 on the drive seat 10. Use a tool compatible with the drive seat 10 to screw the drive seat 10 clockwise. The drive seat 10 drives the hub 3 to rotate, and the hub 3 produces a lateral displacement to the side of the hub 1. Through the interaction with the oblique surface of the transmission block 6, the lateral force pushes the transmission block 6 to move upward and squeeze the elastic body 5. The transmission block 6 moves upward so that the rotating shaft 8 also moves upward. The upward movement of the rotating shaft 8 drives the mounting seat 4 to move upward, and then the blade 2 moves upward until the blocks 14 on both sides of the mounting seat 4 are completely disengaged from the slots 13. At this time, stop screwing the drive seat 10. Then the worker rotates the blade 2 so that the two blocks 14 correspond to the appropriate slots 13, and the blade 2 is at a new inclination angle. Then, the drive seat 10 is screwed in the opposite direction to move the hub 3 to the side away from the hub 1. The elastic potential energy stored in the elastomer 5 generates a downward rebound force, driving the transmission block 6 to move relatively downward along the inclined surface of the hub 3, thereby driving the blade 2 to move downward. The worker assists the blade 2 to press downward to allow the block 14 to be stuck in the slot 13 until the block 14 is completely stuck in the slot 13, and stops screwing the drive seat 10. At this time, the blade 2 is at a new inclination angle, and the clamping ring 7 is installed again to lock the mounting seat 4 in the assembly slot 12, and then the cover 11 is returned to its original position to complete the angle adjustment of the blade 2.

[0054] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An axial flow construction fan impeller with adjustable blades, comprising a hub (1), a hub disc (3), and a plurality of blades (2), wherein the plurality of blades (2) are evenly distributed around the hub (1), and characterized in that: The side wall of the hub (1) is provided with an assembly groove (12), the inner side wall of the assembly groove (12) is provided with a plurality of annularly distributed clamping grooves (13), the lower end of the blade (2) is provided with a mounting seat (4) adapted to the assembly groove (12), the side wall of the mounting seat (4) is provided with a clamping block (14) adapted to the clamping groove (13), the bottom surface of the mounting seat (4) is provided with a rotating shaft (8), the lower end of the rotating shaft (8) is movably connected with a transmission component, the hub (3) is movably connected to the hub (1), the hub (3) and the hub (1) rotate relative to each other to generate axial displacement and drive the blade (2) to move up to the clamping block (14) through the transmission component to disengage from the clamping groove (13) and then adjust the angle of the blade (2).

2. The axial flow construction fan impeller with adjustable blades according to claim 1, characterized in that: The mounting seat (4) is circular, the end surface of the mounting seat (4) is located outside the blade (2), and two symmetrical clamping blocks (14) are distributed radially on the side wall of the mounting seat (4).

3. The axial flow construction fan impeller with adjustable blades according to claim 1, characterized in that: A clamping ring (7) is provided on the side wall of the hub (1). The clamping ring (7) has through holes (17) distributed circumferentially corresponding to the blades (2). The clamping ring (7) presses the mounting seat (4) into the assembly groove (12).

4. The axial flow construction fan impeller with adjustable blades according to claim 1, characterized in that: The transmission assembly includes a transmission block (6), the lower end of the rotating shaft (8) passes through the side wall of the wheel hub (1) and is movably connected to the transmission block (6), the rotating shaft (8) and the transmission block (6) can rotate relative to each other, and the side surface of the transmission block (6) is in oblique straight contact with the side surface of the hub (3).

5. The axial flow construction fan impeller with adjustable blades according to claim 4, characterized in that: The top surface of the transmission block (6) is provided with a rotating cavity (15), a bearing (16) is installed in the rotating cavity (15), and the lower end of the rotating shaft (8) is connected to the inner ring of the bearing (16) by interference fit.

6. The axial flow construction fan impeller with adjustable blades according to claim 4, characterized in that: An elastic body (5) located outside the rotating shaft (8) is provided between the top surface of the transmission block (6) and the inner wall of the wheel hub (1).

7. The axial flow construction fan impeller with adjustable blades according to claim 6, characterized in that: The elastic body (5) is a spring or an air bag.

8. The axial flow construction fan impeller with adjustable blades according to claim 1, characterized in that: An external thread is provided on the outer wall of the hub (3), an assembly hole (9) adapted to the hub (3) is provided on the side of the wheel hub (1), and an internal thread adapted to the external thread is provided on the inner wall of the assembly hole (9).

9. The axial flow construction fan impeller with adjustable blades according to claim 8, characterized in that: A driving seat (10) for driving the hub (3) to rotate is provided at one end of the hub (3) away from the wheel hub (1). A hemispherical cover (11) is bolted to the driving seat (10), and the cover (11) and the hub (3) form a cone.

10. The axial flow construction fan impeller with adjustable blades according to claim 9, characterized in that: The cross section of the driving seat (10) is a regular quadrilateral, a regular pentagon, or a regular hexagon.

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