Blade-adjustable axial flow construction fan impeller

Abstract

The invention relates to the technical field of axial flow fans, and particularly discloses a blade-adjustable axial flow construction fan impeller which comprises a hub, a hub disc and a plurality of blades, the blades are evenly distributed in the circumferential direction of the hub, an assembly groove is formed in the side wall of the hub, and a plurality of annularly-distributed clamping grooves are formed in the inner side wall of the assembly groove. Mounting bases matched with the assembling grooves are arranged at the lower ends of the blades, clamping blocks matched with the clamping grooves are arranged on the side walls of the mounting bases, rotating shafts are arranged on the bottom faces of the mounting bases, and the lower ends of the rotating shafts are movably connected with transmission assemblies. Axial force generated by relative rotation of the hub and the hub drives the blades to move upwards through the transmission assembly until the clamping blocks are separated from the clamping grooves, and then the angles of the blades are adjusted. The blade angle adjusting error is small, it can be guaranteed that the adjusting inclination angles of all the blades are consistent, and then normal operation of the axial flow fan is guaranteed.

Description

Technical Field

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

[0002] Axial fans are widely used and are often applied to various places that require cooling and ventilation. In the existing fans, the blades of the impeller are either integrally formed with the hub or fixedly installed on the hub. In either case, once the processing is completed, the blade angle cannot be changed. Therefore, a finished impeller can only meet the usage requirements of one working condition. In actual use, due to the complex working environment, the required ventilation volume and air pressure are also different. In order to ensure that the ventilator is in the best working state, an impeller with appropriate parameters needs to be used in combination. This not only makes the equipment replacement troublesome, but also increases the cost burden and reduces the effective use of the machine.

[0003] In the prior art, most of them adapt to different working condition requirements by changing the blade angle. There are two forms of adjusting the blade angle: dynamic and static. Dynamic means adjusting during the operation of the fan. The mechanism of this adjustment method is relatively complex, the manufacturing cost is very high, and it is less used. Static adjustment means manually adjusting through a series of mechanisms when the fan is stationary. Each blade is adjusted one by one. First, the casing needs to be disassembled, the fixing device of each blade is loosened, each blade is rotated by a certain angle and then locked, and the fixing device is restored to the original installation position. This adjustment method results in a large angle error in blade adjustment, and it is impossible to ensure that the adjustment inclination angles of each blade are the same, thereby affecting the normal operation of the axial fan. Summary of the Invention

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

[0005] To solve the above technical problems, the present invention adopts the following solutions: An impeller of an axial construction fan with adjustable blades, including a hub, a hub plate, and a plurality of blades. The plurality of blades are evenly distributed in the circumferential direction of the hub. An assembly groove is provided on the side wall of the hub, and a number of annularly distributed clamping grooves are provided on the inner side wall of the assembly groove. The lower end of the blade is provided with a mounting seat adapted to the assembly groove, 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, the lower end of the rotating shaft is movably connected with a transmission component, the hub plate is movably connected with the hub, and the axial force generated by the relative rotation of the hub plate and the hub drives the blade to move upward until the clamping block disengages from the clamping groove to adjust the blade angle.

[0006] In this solution, a mounting groove is provided on the side wall of the hub. There are several annularly distributed clamping grooves on the inner side wall of the mounting groove. The hub provides the basic structure for the installation of the blades. The design of the clamping grooves is used to cooperate with the clamping blocks on the blades to fix the blades at a specific angle. The hub plate 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 plate and the hub drives the blade to move upward for angle adjustment. Multiple blades are evenly distributed around the circumference of the hub. The lower end of the blade is provided with a mounting seat adapted to the mounting groove. The clamping blocks on the mounting seat cooperate with the clamping grooves in the mounting groove of the hub, so that the blade maintains a fixed angle in the normal working state. A rotating shaft is provided at the bottom surface of the mounting seat, and the lower end of the rotating shaft is movably connected with a transmission component. The transmission component plays a role of transmitting the axial force generated by the relative rotation of the hub plate and the hub to the blade and driving the blade to move upward. Initial fixed state: In the normal working state, the mounting seat of the blade is inserted into the mounting groove of the hub. The clamping blocks on the side wall of the mounting seat are tightly fitted with the clamping grooves on the inner side wall of the mounting groove, firmly fixing the blade on the hub and keeping the blade at a set angle, so as to ensure that the fan conveys air according to the design requirements. Angle adjustment process: When the blade angle needs to be adjusted, the operator makes the hub plate and the hub rotate relatively. This relative rotation generates an axial force, which is transmitted to the rotating shaft at the bottom surface of the blade mounting seat through the transmission component. Under the action of the axial force, the blade will move upward along the mounting groove. As the blade moves upward, the clamping blocks on the side wall of the mounting seat will gradually disengage from the clamping grooves. When the clamping blocks are completely disengaged from the clamping grooves, the blade loses the fixing effect of the clamping grooves. Stop the relative rotation of the hub plate and the hub. At this time, the blade can be rotated manually so that the clamping blocks on the side wall of the mounting seat correspond to different clamping grooves, so that the blade reaches the required new angle. When the blade is adjusted to the appropriate angle, the clamping blocks on the mounting seat are reinserted into the corresponding clamping grooves, fixing the blade at the new angle again, and the fan can work according to the new blade angle. Since the distribution mode of the clamping grooves in each mounting groove is exactly the same, when adjusting the blade angle, only the clamping blocks on each blade need to be inserted into the clamping grooves at the same position, so as to ensure that the inclination angles of each blade are consistent, greatly reducing the angle adjustment error, and further ensuring the normal operation of the axial flow fan.

[0007] Optionally, the mounting seat is circular, the end face of the mounting seat is located outside the blade, and two symmetric clamping blocks are distributed radially on the side wall of the mounting seat.

[0008] Optionally, a pressing ring is provided on the side wall of the hub. Through holes corresponding to the blades are distributed circumferentially on the pressing ring, and the pressing ring presses the mounting seat in the mounting groove.

[0009] Optionally, the transmission component includes a transmission block. The lower end of the rotating shaft passes through the side wall of the hub and is movably connected with the transmission block. The rotating shaft and the transmission block can rotate relatively, and the side surface of the transmission block is in contact with the side surface of the hub plate in an inclined straight surface.

[0010] 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 in interference fit connection with the inner ring of the bearing.

[0011] Optionally, an elastic body is provided between the top surface of the transmission block and the inner wall of the hub and is located outside the rotating shaft.

[0012] Optionally, the elastic body is a spring or an airbag.

[0013] Optionally, an external thread is provided on the outer wall of the hub plate, an assembly hole adapted to the hub plate is provided on the side surface of the hub, and an internal thread adapted to the external thread is provided on the inner wall of the assembly hole.

[0014] Optionally, a drive seat for driving the hub plate to rotate is provided at one end of the hub plate away from the hub, a hemispherical cover is bolted to the drive seat, and the cover and the hub plate form a cone.

[0015] Optionally, the cross-section of the drive seat is a regular quadrilateral or a regular pentagon or a regular hexagon.

[0016] The beneficial effects of the present invention are as follows: 1. In the present invention, during the angle adjustment process: when the blade angle needs to be adjusted, the operator makes the hub plate and the hub rotate relative to each other. This relative rotation generates an axial force, which is transmitted to the rotating shaft at the bottom surface of the blade mounting seat through the transmission component. Under the action of the axial force, the blade will move upward along the assembly groove. As the blade moves upward, the block on the side wall of the mounting seat will gradually disengage from the card slot. When the block completely disengages from the card slot, the blade loses the fixing effect of the card slot. Stop the relative rotation of the hub plate and the hub. At this time, the blade can be rotated manually to make the block on the side wall of the mounting seat correspond to different card slots, so that the blade reaches the required new angle. When the blade is adjusted to the appropriate angle, the block on the mounting seat is reinserted into the corresponding card slot, fixing the blade at the new angle again, and the fan can operate according to the new blade angle. Since the distribution pattern of the card slots in each assembly groove is exactly the same, when adjusting the blade angle, only the blocks on each blade need to be inserted into the card slots at the same position, so as to ensure that the inclination angles of each blade are consistent, greatly reducing the angle adjustment error, and thus ensuring the normal operation of the axial flow fan. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the blade angle adjustment process; Figure 3 is a schematic structural diagram of the distribution of the assembly grooves on the plane of the hub; Figure 4 is an assembly structure diagram of the mounting seat and the block; Figure 5Schematic diagram of the assembly structure of the bearing and the rotating shaft; Figure 6 It is the planar structure diagram of the pressing ring.

[0018] Reference numerals: 1 - hub, 2 - blade, 3 - hub plate, 4 - mounting seat, 5 - elastomer, 6 - transmission block, 7 - pressing ring, 8 - rotating shaft, 9 - assembly hole, 10 - drive seat, 11 - housing, 12 - assembly groove, 13 - clamping groove, 14 - clamping block, 15 - rotating cavity, 16 - bearing, 17 - through hole. Specific embodiments

[0019] The following will further elaborate on the present invention in conjunction with the embodiments and the attached drawings, but the implementation manners of the present invention are not limited thereto.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0021] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "provided with", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] An axial flow construction fan impeller with adjustable blades, including a hub 1, a hub plate 3, and a plurality of blades 2. The plurality of blades 2 are evenly distributed in the circumferential direction of the hub 1. An assembly groove 12 is provided on the side wall of the hub 1. A plurality of annularly distributed clamping grooves 13 are provided on the inner side wall of the assembly groove 12. The lower end of the blade 2 is provided with a mounting seat 4 adapted to the assembly groove 12. A clamping block 14 adapted to the clamping groove 13 is provided on the side wall of the mounting seat 4. A rotating shaft 8 is provided on the bottom surface of the mounting seat 4. The lower end of the rotating shaft 8 is movably connected to a transmission assembly. The hub plate 3 is movably connected to the hub 1. The axial force generated by the relative rotation of the hub plate 3 and the hub 1 drives the blade 2 to move upward until the clamping block 14 disengages from the clamping groove 13 to adjust the angle of the blade 2.

[0023] In this embodiment, as Figure 1As shown, the hub 1 is a circular structure. There is a ring of assembly grooves 12 on the side wall of the hub 1. A plurality of assembly grooves 12 are annularly and spacedly distributed on the hub 1. As Figure 3 shown, there are several annularly distributed clamping grooves 13 on the inner side wall of the assembly groove 12. The clamping groove 13 is equivalent to a notch groove. The clamping groove 13 is recessed towards the outside of the assembly groove 12. The mounting seat 4 can be fitted and clamped into the assembly groove 12. The hub 1 provides a basic structure for the installation of the blade 2. The design of the clamping groove 13 is used to cooperate with the clamping block 14 on the blade 2 to realize the fixation of the blade 2 at a specific angle. The hub plate 3 is movably connected to the hub 1. During the process of adjusting the angle of the blade 2, the axial force generated by the relative rotation of the hub plate 3 and the hub 1 drives the blade 2 to move upward for angle adjustment. A plurality of blades 2 are evenly distributed in the circumferential direction of the hub 1. The lower end of the blade 2 is provided with a mounting seat 4 adapted to the assembly groove 12. The clamping block 14 on the mounting seat 4 cooperates with the clamping groove 13 in the assembly groove 12 of the hub 1 to keep the blade 2 at a fixed angle under normal working conditions. 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 assembly. The transmission assembly plays a role in transmitting the axial force generated by the relative rotation of the hub plate 3 and the hub 1 to the blade 2 and driving the blade 2 to move upward. Under normal working conditions, the mounting seat 4 of the blade 2 is inserted into the assembly groove 12 of the hub 1. The clamping block 14 on the side wall of the mounting seat 4 is tightly fitted with the clamping groove 13 on the inner side wall of the assembly groove 12 to fix the blade 2 on the hub 1 and keep the blade 2 at a set angle, so as to ensure that the fan conveys air according to the design requirements.

[0024] As Figure 2As shown in the figure, the angle adjustment process is as follows: When the angle of the blade 2 needs to be adjusted, the operator makes the hub plate 3 rotate relative to the hub 1. This relative rotation generates an axial force, which is transmitted to the rotating shaft 8 at the bottom surface of the blade 2 mounting seat 4 through the transmission component. Under the action of the axial force, the blade 2 moves upward along the assembly groove 12. As the blade 2 moves upward, the clamping block 14 on the side wall of the mounting seat 4 gradually disengages from the clamping groove 13. When the clamping block 14 completely disengages from the clamping groove 13, the blade 2 loses the fixing effect of the clamping groove 13. Stop the relative rotation of the hub plate 3 and the hub 1. At this time, the blade 2 can be rotated manually. The blade 2 rotates around the center point of the assembly groove 12, making the clamping block 14 on the side wall of the mounting seat 4 correspond to different clamping grooves 13, so that the blade 2 reaches the required new angle. When the blade 2 is adjusted to the appropriate angle, the clamping block 14 on the mounting seat 4 is reinserted into the corresponding clamping groove 13, fixing the blade 2 at the new angle again. The fan can work according to the new angle of the blade 2. Since the distribution method of the clamping grooves 13 in each assembly groove 12 is exactly the same, the number of clamping grooves 13 in each assembly groove 12 should be an even number, that is, the quantity, angle, and size are all the same. When adjusting the angle of the blade 2, only need to insert the clamping block 14 on each blade 2 into the clamping groove 13 at the same position, so as to ensure that the inclination angle of each blade 2 is consistent, greatly reducing the adjustment angle error, and thus ensuring the normal operation of the axial flow fan.

[0025] Simple structure: The angle adjustment structure of the blade 2 of this axial flow fan is relatively simple. Through the cooperation of the hub 1, the hub plate 3, the blade 2 and the transmission component, the adjustable function of the angle of the blade 2 is realized, reducing the manufacturing and maintenance costs.

[0026] Convenient adjustment: The operator only needs to control the relative rotation of the hub plate 3 and the hub 1 to drive the blade 2 to move upward and disengage from the clamping groove 13, and then it is convenient to manually adjust the angle of the blade 2, and the operation process is relatively simple.

[0027] High reliability: The cooperation mode of the clamping groove 13 and the clamping 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 to ensure the smooth progress of the angle adjustment process.

[0028] Adjustment accuracy: The clamping block 14 on each blade 2 is inserted into the clamping groove 13 at the same position in the assembly groove 12 to ensure that the inclination angle of each blade 2 is consistent, greatly reducing the error of the adjustment angle.

[0029] Furthermore, the mounting seat 4 is circular, the end face of the mounting seat 4 is located outside the blade 2, and two symmetric clamping blocks 14 are distributed radially on the side wall of the mounting seat 4.

[0030] Specifically, as Figure 4As shown, the mounting base 4 is circular, which is convenient for processing and rotation. The end face of the mounting base 4 is located outside the blade 2, which is convenient for the later pressing ring 7 to press the mounting base 4, avoiding interference of the blade 2 with the pressing ring 7. There are two symmetrically arranged clamping blocks 14 on the side wall of the mounting base 4, and the two clamping blocks 14 are located at both ends of the same diameter of the mounting base 4. This can effectively prevent the blade 2 from rotating during the operation of the fan, and the limiting effect is better. When the symmetrically distributed clamping blocks 14 bear the axial force or other acting forces, the forces received by the mounting base 4 can be more balanced. Even if one of the clamping blocks 14 is broken, the other clamping block 14 can still play a backup limiting role. The clamping block 14 and the mounting base 4 can be connected by welding or integrally formed. When adjusting the angle of the blade 2, after the clamping block 14 is disengaged from the clamping groove 13, rotate the blade 2 to align the clamping block 14 with the clamping groove 13 on the same diameter of the assembly groove 12, and rotate the hub disc 3 in the reverse direction. The blade 2 moves downward to make the clamping block 14 snap into the clamping groove 13 to complete the angle adjustment of the blade 2. A digital mark can be set on the clamping grooves 13 at both ends of the same diameter, which is convenient for workers to accurately adjust each blade 2 to the same inclination angle.

[0031] Furthermore, a pressing ring 7 is provided on the side wall of the hub 1. The pressing ring 7 is circumferentially distributed with through holes 17 corresponding to the blades 2, and the pressing ring 7 presses the mounting base 4 into the assembly groove 12.

[0032] Specifically, as Figure 6 shown, in order to prevent the blade 2 from detaching from the hub 1 during the operation of the fan, the pressing ring 7 is screwed to the hub 1. The pressing ring 7 is axially provided with through holes 17 corresponding to the blades 2. The through holes 17 allow the blades 2 to pass through, but do not allow the mounting base 4 to pass through. That is, the pressing ring 7 contacts the top surface of the mounting base 4, and finally the pressing ring 7 is locked to the hub 1 by screws. Countersunk screws can be used. It can also be set as two pressing rings 7, and the two pressing 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 pressing ring 7 needs to be removed first. Compared with the existing structure in which each blade 2 has a fixing device, in this solution, a plurality of blades 2 are locked to the hub 1 by a locking mechanism, and the installation and disassembly are more time-saving and labor-saving.

[0033] Furthermore, the transmission assembly includes a transmission block 6. The lower end of the rotating shaft 8 passes through the side wall of the 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 inclined straight surface contact with the side surface of the hub disc 3.

[0034] Specifically, the rotating shaft 8 is movably connected to the transmission block 6. After the clamping block 14 disengages from the clamping groove 13, it is convenient to rotate the blade 2 to an appropriate angle. The contact surface between the transmission block 6 and the hub plate 3 is an inclined plane. When the hub plate 3 rotates and moves towards the hub 1, the axial force (lateral force) generated will push the transmission block 6 upward, thereby lifting the blade 2 to a certain height.

[0035] Further, a rotating cavity 15 is provided on the top surface of the transmission block 6, and a bearing 16 is installed in the rotating cavity 15. The lower end of the rotating shaft 8 is connected to the inner ring of the bearing 16 by interference fit.

[0036] Specifically, as Figure 5 shown, a downwardly concave rotating cavity 15 is formed 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 inserted into the inner ring of the bearing 16 by interference fit. The flexibility of the subsequent angle adjustment of the blade 2 can be improved through the bearing 16.

[0037] Further, an elastic body 5 is provided between the top surface of the transmission block 6 and the inner wall of the hub 1 on the outside of the rotating shaft 8.

[0038] Further, the elastic body 5 is a spring or an airbag.

[0039] Specifically, as Figure 1 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 airbag 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 rotates to an appropriate position, at this time, the clamping block 14 is aligned with the clamping groove 13, and the elastic body 5 is in a compressed state. Then, the hub plate 3 is rotated in the reverse direction, so that the hub plate 3 moves away from the hub 1. The end of the hub plate 3 releases the limit on the transmission block 6. Under the action of the elastic potential energy stored in the elastic body 5, initially, the transmission block 6 moves downward along the inclined surface of the hub plate 3, and the worker then assists in pressing the blade 2 downward, so that the clamping block 14 is inserted into the clamping groove 13, and the rotation of the hub plate 3 is stopped. Finally, a pressing ring 7 is installed on the hub 1 to lock the mounting seat 4 in the assembly groove 12. A hole passage allowing the rotating shaft 8 to pass through is provided at the bottom surface of the assembly groove 12. The diameter of the hole passage 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. In this way, the mounting seat 4 will be restricted in the assembly groove 12 and will not slide out from the hole passage.

[0040] Further, an external thread is provided on the outer wall of the hub plate 3, and an assembly hole 9 adapted to the hub plate 3 is provided on the side surface of the hub 1. An internal thread adapted to the external thread is provided on the inner wall of the assembly hole 9.

[0041] 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 are always tightly connected, thereby ensuring the stability and reliability of the fan structure and avoiding failures or safety accidents caused by loose connections.

[0042] 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 a basis for the generation of axial force during the angle adjustment of the blade 2. When the angle of the blade 2 needs to be adjusted, the relative position of the hub 3 and the hub 1 is changed by further rotating the hub 3 forward or reversely, thereby generating the required axial force to drive the blade 2 to move upward and adjust the angle of the blade 2.

[0043] 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.

[0044] Furthermore, the cross section of the driving seat 10 is a regular quadrilateral, a regular pentagon, or a regular hexagon.

[0045] Specifically, the cross section of the drive seat 10 is a regular quadrilateral, a regular pentagon or a regular hexagon. When adjusting the angle of the blade 2, a tool (such as a wrench, a socket, etc.) is needed to rotate the hub 3, and the polygonal drive seat 10 provides multiple reliable points of force for the tool. Taking the regular hexagon as an example, the wrench can be easily stuck on the six sides of the drive seat 10, and the operator can rotate the hub 3 more stably and labor-savingly. Compared with a circular or other irregular shape, the polygonal drive seat 10 can better transmit torque, reduce the slippage that may occur during the rotation process, and improve the efficiency and accuracy of adjusting the angle of the blade 2. The cover 11 and the hub 3 form a cone. From the perspective of aerodynamics, the cone can reduce the obstruction of the airflow during the operation of the fan, reduce the resistance loss when the airflow passes, and improve the efficiency of the fan. Just like the nose of an aircraft is designed to be streamlined to reduce air resistance, the combination of the cone-shaped cover 11 and the hub 3 can also make the fan smoother when conveying air. The cover 11 can be connected to the drive seat 10 or to the hub 3.

[0046] Specific principle of the angle adjustment of the blade 2 of the present invention: After the fan stops, first remove the screws between the pressing ring 7 and the hub 1, and take off the pressing ring 7. Then remove the housing 11 on the driving seat 10, and use a tool adapted to the driving seat 10 to screw the driving seat 10 clockwise. The driving seat 10 drives the hub plate 3 to rotate, and the hub plate 3 generates a lateral displacement towards the hub 1. Through the interaction with the inclined plane of the transmission block 6, the lateral force pushes the transmission block 6 to move upward and squeeze the elastic body 5. The upward movement of the transmission block 6 causes the rotating shaft 8 to also move 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 clamping blocks 14 on both sides of the mounting seat 4 are completely separated from the card slots 13. At this time, stop screwing the driving seat 10, and then the worker rotates the blade 2 to make the two clamping blocks 14 correspond to the appropriate card slots 13, and the blade 2 is at a new inclination angle. Then, screw the driving seat 10 in the reverse direction, so that the hub plate 3 moves away from the hub 1. The elastic potential energy stored in the elastic body 5 generates a downward restoring force, driving the transmission block 6 to move relatively downward along the inclined plane of the hub plate 3, and then driving the blade 2 to move downward. The worker can assist the blade 2 to press downward to make the clamping blocks 14 snap into the card slots 13 until the clamping blocks 14 are completely snapped into the card slots 13, and then stop screwing the driving seat 10. At this time, the blade 2 is at a new inclination angle. Install the pressing ring 7 again to lock the mounting seat 4 in the assembly groove 12, and then return the housing 11 to its original position to complete the angle adjustment of the blade 2.

[0047] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. According to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiments within the spirit and principle of the present invention still fall within the protection scope 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). The plurality of blades (2) are evenly distributed in the circumferential direction of the hub (1), and it is characterized in that, An assembly groove (12) is provided on the side wall of the hub (1). A number of annularly distributed clamping grooves (13) are provided on the inner side wall of the assembly groove (12). An installation seat (4) adapted to the assembly groove (12) is provided at the lower end of the blade (2). Clamping blocks (14) adapted to the clamping grooves (13) are provided on the side wall of the installation seat (4). A rotating shaft (8) is provided on the bottom surface of the installation seat (4). The lower end of the rotating shaft (8) is movably connected to a transmission assembly. The hub plate (3) is movably connected to the hub (1). The axial force generated by the relative rotation of the hub plate (3) and the hub (1) drives the blade (2) to move upward until the clamping block (14) disengages from the clamping groove (13), so as to 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 installation seat (4) is circular. The end face of the installation seat (4) is located outside the blade (2). Two symmetric clamping blocks (14) are distributed radially on the side wall of the installation seat (4).

3. The axial-flow construction fan impeller with adjustable blades according to claim 1, wherein A pressing ring (7) is provided on the side wall of the hub (1). Through holes (17) corresponding to the blades (2) are circumferentially distributed on the pressing ring (7). The pressing ring (7) presses the installation seat (4) in the assembly groove (12).

4. The axial flow construction fan impeller with adjustable blades according to claim 1, wherein, The transmission assembly includes a transmission block (6). The lower end of the rotating shaft (8) passes through the side wall of the 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. The side surface of the transmission block (6) is in inclined straight surface contact with the side surface of the hub plate (3).

5. The axial flow construction fan impeller with adjustable blades according to claim 4, wherein, 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). 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 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 airbag.

8. A variable-blade axial-flow construction fan impeller according to claim 1, characterized in that, External threads are provided on the outer wall of the hub plate (3). An assembly hole (9) adapted to the hub plate (3) is provided on the side surface of the hub (1). Internal threads adapted to the external threads are 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 drive seat (10) for driving the hub plate (3) to rotate is provided at one end of the hub plate (3) away from the hub (1). A hemispherical cover (11) is bolted to the drive seat (10). The cover (11) and the hub plate (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 drive seat (10) is a regular quadrilateral or a regular pentagon or a regular hexagon.

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