Adjusting mechanism and adjusting method for blade angle of counter-rotating fan

Abstract

The invention relates to the technical field of fan blade adjustment, and discloses a counter-rotating type fan blade angle adjusting mechanism and method, the counter-rotating type fan blade angle adjusting mechanism comprises an annular adjusting plate, a movable adjusting part and a plurality of sets of swing parts, and the annular adjusting plate is coaxially arranged in a cavity formed in a fan hub; the movable adjusting part is arranged on the cavity and used for driving the annular adjusting plate to move in the axial direction of the fan hub, and the movable adjusting part comprises at least two sets of lead screw transmission assemblies and synchronous rotation driving pieces; the multiple sets of swing parts are connected between the blades and the annular adjusting plate in a one-to-one correspondence mode and used for converting linear movement of the annular adjusting plate into angle rotation adjustment of the blades, each swing part comprises a blade handle shaft, a swing arm and a sliding connecting piece, each blade handle shaft is rotationally connected with a fan hub, and the two ends of each blade handle shaft are fixed to the corresponding blade and the corresponding swing arm respectively; the angle adjusting mechanism is compact in overall structure, and synchronous adjustment of all the blades in the limited hub installation space of the counter-rotating fan can be achieved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine blade adjustment technology, specifically a counter-rotating wind turbine blade angle adjustment mechanism and method. Background Technology

[0002] A counter-cyclone fan has two impellers installed in series and rotating in opposite directions, with different blade angles to achieve different airflow and pressure. This design makes counter-cyclone fans highly efficient, low-noise, and compact.

[0003] Typically, the required air volume is small in the early stages of coal mining and gradually increases as mining progresses. For a fan with a fixed blade angle, its air volume changes approximately linearly with its rotational speed. If you want to further increase the air volume, you need to adjust the blade angle to obtain a larger air volume. Adjusting the rotational speed and blade angle can also further improve the fan efficiency and achieve better economic benefits.

[0004] Currently, some blade angle adjustment mechanisms employ hydraulic adjustment devices. These devices typically integrate a hydraulic cylinder within the wind turbine hub. The pressure of hydraulic oil drives a piston and a connected push-pull rod to move linearly. This linear motion is then converted into blade rotation via a crank-connecting rod mechanism, achieving angle adjustment. For example, CN119572536A, an invention entitled "A Hydraulic Cylinder Adjustment Device for an Adjustable Axial Flow Fan with Adjustable Blades," includes a piston shaft, a piston fixed to the shaft, an axially movable hydraulic cylinder body, a cylinder head, and an adjustment rod passing through the piston shaft. This device controls the cylinder body position via an external hydraulic oil supply system and uses a rack and pinion mechanism to drive the adjustment rod for fine-tuning. It also incorporates angular displacement sensors and linear displacement sensors for closed-loop feedback control to achieve precise adjustment. While these hydraulic adjustment devices offer fast response and high adjustment accuracy, the hydraulic cylinder and its associated piston shaft, sensors, rack and pinion mechanisms require significant axial and radial space. This presents a significant layout challenge for the compact structure and extremely limited internal space of counter-rotating wind turbine hubs. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems mentioned in the background art and to provide a counter-rotating fan blade angle adjustment mechanism and method to adapt to small and compact working environments.

[0006] The technical solution of this invention is: A counter-rotating wind turbine blade angle adjustment mechanism is used to connect between a wind turbine hub and multiple blades arranged circumferentially along the wind turbine hub. The blade angle adjustment mechanism includes an annular adjustment plate, a movable adjustment part, and multiple sets of swing parts. The annular adjustment plate is coaxially disposed within a cavity opened inside the wind turbine hub, used to drive the annular adjustment plate to move axially along the wind turbine hub. It includes at least two sets of screw drive assemblies and synchronous rotation drive components. The screw drive assembly includes a screw and a nut seat. The screw is arranged along the axial direction of the wind turbine hub, and the end of the screw is rotatably connected to the cavity. The nut seat is fixed to the annular adjustment plate. A lead screw is threaded through and connected to the nut seat. The output end of the synchronous rotation drive is connected to the lead screw in each lead screw transmission assembly to drive each lead screw to rotate synchronously. Multiple sets of swing parts are connected one-to-one between each blade and the annular adjusting plate to convert the linear movement of the annular adjusting plate into the angular rotation adjustment of each blade. Each swing part includes a blade shank shaft, a swing arm, and a sliding connector. The blade shank shaft is rotatably connected to the fan hub. Both ends of the blade shank shaft are fixedly connected to the blade and the swing arm, respectively. The end of the swing arm away from the blade shank shaft is connected to the sliding connector. The sliding connector is slidably connected to the edge of the annular adjusting plate.

[0007] Preferably, as a further improvement of the present invention, the synchronous rotation drive component includes a rotation drive module, spur gears, a gear ring, and an annular limiting guide rail; the rotation drive module is connected to the end of the lead screw in one of the lead screw transmission components, and is used to drive the lead screw to rotate around its own axis; the number of spur gears is the same as the number of lead screw transmission components, and they are fitted and fixed on each lead screw in a one-to-one correspondence; the gear ring is coaxially disposed in the cavity, and the circumferential side wall of the gear ring with teeth meshes with each spur gear; the annular limiting guide rail is fixed in the cavity, and an annular limiting groove is formed on the circumferential side wall of the annular limiting guide rail, and the circumferential side wall of the gear ring opposite to the teeth is slidably connected in the annular limiting groove.

[0008] Preferably, as a further improvement of the present invention, the rotation drive module includes a drive mounting housing, an adjusting shaft, and a bevel gear transmission assembly; the drive mounting housing is fixed to the end face of the wind turbine hub; the adjusting shaft is arranged perpendicularly to the lead screw, one end of the adjusting shaft extends into the drive mounting housing and is rotatably connected to the drive mounting housing, and the other end of the adjusting shaft extends out of the drive mounting housing and is connected to a power unit that drives its rotation; the bevel gear transmission assembly includes a first bevel gear and a second bevel gear that mesh with each other, the first bevel gear is fixed to one end of the adjusting shaft, and one end of the lead screw extends out of the wind turbine hub and into the drive mounting housing and is fixed to the second bevel gear.

[0009] Preferably, as a further improvement of the present invention, the power unit includes a handwheel and a locking structure, the handwheel being fixedly mounted on the end of the adjusting shaft, and the locking structure being an electromagnetic chuck disposed between the drive mounting housing and the adjusting shaft.

[0010] Preferably, as a further improvement of the present invention, the power unit is a motor with a self-locking function, the motor housing is fixed on the outer wall of the drive mounting housing, and the output shaft of the motor is connected to the adjusting shaft.

[0011] Preferably, as a further improvement of the present invention, multiple sets of guide components are provided between the annular adjusting plate and the cavity, the multiple sets of guide components are arranged around the center of the cavity, the guide components are guide rods, arranged along the axial direction of the fan hub, the two ends of the guide rods are fixed to the inner walls of both sides of the fan hub, and the annular adjusting plate is provided with a slot that matches the guide rod, and is slidably connected to the guide rod through the slot.

[0012] Preferably, as a further improvement of the present invention, the sliding connector is Y-shaped, with a jaw on one side, and the other end of the jaw slides into contact with the surface of the annular adjusting plate, while the other side is hinged to the swing arm.

[0013] This invention also discloses a method for adjusting the blade angle of a counter-rotating fan, which is implemented using the aforementioned counter-rotating fan blade angle adjustment mechanism, and includes the following steps: The synchronous rotation drive component drives the lead screw in the lead screw transmission assembly to rotate synchronously, causing the annular adjusting plate to move along the axial direction of the wind turbine hub. As the annular adjusting plate moves along the axial direction of the wind turbine hub, the sliding connectors in each swing part pull the swing arm to drive the blade shaft to rotate, thereby synchronously driving multiple sets of swing parts to convert the linear movement of the annular adjusting plate into the angular rotation adjustment of each blade.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. A screw drive assembly is used to drive the annular adjusting plate to move axially along the wind turbine hub. During the movement of the annular adjusting plate, multiple sets of swing parts convert the linear movement of the annular adjusting plate into the angle rotation adjustment of each blade, realizing the synchronous adjustment of multiple blades. Compared with hydraulic cylinders, the screw drive assembly avoids the presence of cylinders occupying too much installation space. The length of the screw can be directly used as the axial space required for adjustment. Setting at least two sets of screw drive assemblies can form a rotation limit for the annular adjusting plate, ensuring that the rotation of the screw can convert the rotational motion into a linear movement process. The swing part can use the linear movement of the annular adjusting plate to transmit to the swing arm through the sliding connector, and make the blade shaft rotate around its own axis, thereby driving the blade to rotate and realizing the blade angle adjustment process.

[0015] 2. The entire adjustment mechanism has a compact structure, which can adapt to the limited space inside the hub of the mining blower, and can achieve synchronous adjustment of multiple blades with only a small power source. Attached Figure Description

[0016] Figure 1 This is a front view schematic diagram of a counter-rotating fan blade angle adjustment mechanism according to an embodiment of the present invention.

[0017] Figure 2 For the present invention Figure 1 A magnified view of part A.

[0018] Figure 3 This is a cross-sectional structural schematic diagram of a counter-rotating fan blade angle adjustment mechanism according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram illustrating the adjustment principle of a counter-rotating fan blade angle adjustment mechanism according to an embodiment of the present invention. Detailed Implementation

[0020] The following is combined Figures 1-4 The specific embodiments of the present invention will be described in detail below. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0022] Example 1 like Figures 1-3As shown, this embodiment of the invention provides a counter-rotating fan blade angle adjustment mechanism for connecting a fan hub 1 and multiple blades 2 arranged circumferentially along the fan hub 1. The blade angle adjustment mechanism includes an annular adjustment plate 3, a movable adjustment part, and multiple sets of swing parts. The annular adjustment plate 3 is coaxially disposed within a cavity 11 opened inside the fan hub 1. The movable adjustment part is disposed on the cavity 11 and is used to drive the annular adjustment plate 3 to move axially along the fan hub 1. It includes at least two sets of screw drive assemblies and synchronous rotation drive components. The screw drive assembly includes a screw 41 and a nut seat 42. The screw 41 is arranged along the axial direction of the fan hub 1, and the end of the screw 41 is rotatably connected to the cavity 11. The nut seat 42 is fixed. The screw 41 is fixed on the annular adjusting plate 3 and threaded through the nut seat 42. The output end of the synchronous rotation drive is connected to the screw 41 in each screw transmission assembly to drive each screw 41 to rotate synchronously. Multiple sets of swing parts are connected one-to-one between each blade 2 and the annular adjusting plate 3 to convert the linear movement of the annular adjusting plate 3 into the angular rotation adjustment of each blade 2. The swing part includes a blade shaft 51, a swing arm 52 and a sliding connector 53. The blade shaft 51 is rotatably connected to the fan hub 1. The two ends of the blade shaft 51 are fixedly connected to the blade 2 and the swing arm 52 respectively. The end of the swing arm 52 away from the blade shaft 51 is connected to the sliding connector 53. The sliding connector 53 is slidably connected to the edge of the annular adjusting plate 3.

[0023] In this embodiment, a screw drive assembly is used to drive the annular adjustment plate 3 to move along the axial direction of the wind turbine hub 1. During the movement of the annular adjustment plate 3, multiple sets of swing parts convert the linear movement of the annular adjustment plate 3 into the angular rotation adjustment of each blade 2, realizing the synchronous adjustment process of multiple blades 2. The screw drive assembly itself is more accurate than linear movement components such as hydraulic cylinders, and can realize the synchronous and precise adjustment of the angle of multiple blades 2. Setting at least two sets of screw drive assemblies can form a rotation limit on the annular adjustment plate 3, ensuring that the rotation of the screw 41 can convert the rotational motion into a linear movement process. The swing part can use the linear movement of the annular adjustment plate 3 to transmit to the swing arm 52 through the sliding connector 53, and make the blade shaft 51 rotate around its own axis, thereby driving the blades 2 to rotate and realize the angle adjustment process of the blades 2. The entire adjustment mechanism is mainly based on rigid mechanical transmission and has a compact overall structure, which can adapt to the limited space inside the mining wind turbine hub, and only requires a very small power source to realize the synchronous adjustment of multiple blades 2.

[0024] Specifically, such as Figure 3As shown, the synchronous rotation drive includes a rotation drive module 61, spur gears 62, a gear ring 63, and an annular limiting guide rail 64. The rotation drive module 61 is connected to the end of a lead screw 41 in one of the lead screw transmission assemblies, and is used to drive the lead screw 41 to rotate around its own axis. The number of spur gears 62 is the same as the number of lead screw transmission assemblies, and they are fitted and fixed on each lead screw 41 in a one-to-one correspondence. The gear ring 63 is coaxially arranged in the cavity 11, and the circumferential side wall of the gear ring 63 with teeth meshes with each spur gear 62. The annular limiting guide rail 64 is fixed in the cavity 11, and an annular limiting groove is opened on the circumferential side wall of the annular limiting guide rail 64. The circumferential side wall of the gear ring 63 opposite to the teeth is slidably connected in the annular limiting groove.

[0025] In this embodiment, when the synchronous rotation drive drives each lead screw 41 to rotate synchronously, the rotation drive module 61 drives the lead screw 41 connected to it to rotate. Since the lead screw 41 and the other lead screws 41 are provided with spur gears 62 and mesh with the gear ring 63, when the drive module 61 and the lead screw 41 connected to it rotate, the other lead screws 41 are driven to rotate synchronously through gear transmission, thereby realizing the adjustment process of the annular adjustment plate 3.

[0026] The rotation drive module 61 includes a drive mounting housing 611, an adjusting shaft 612, and a bevel gear transmission assembly. The drive mounting housing 611 is fixed to the end face of the fan hub 1. The adjusting shaft 612 is perpendicular to the lead screw 41. One end of the adjusting shaft 612 extends into the drive mounting housing 611 and is rotatably connected to it. The other end of the adjusting shaft 612 extends out of the drive mounting housing 611 and is connected to a power unit that drives its rotation. The bevel gear transmission assembly includes a first bevel gear 613 and a second bevel gear 614 that mesh with each other. The first bevel gear 613 is fixed to one end of the adjusting shaft 612. One end of the lead screw 41 passes through the fan hub 1 and extends into the drive mounting housing 611 and is fixed to the second bevel gear 614.

[0027] In one optional implementation of the power unit, the power unit in this embodiment includes a handwheel 6121 and a locking structure. The handwheel 6121 is fixedly mounted on the end of the adjusting shaft 612. The locking structure is an electromagnetic chuck, which is set between the drive mounting housing 611 and the adjusting shaft 612. The electromagnetic chuck can lock the adjusting shaft 612 after the angle is adjusted, thereby locking the angle of each blade.

[0028] In another optional implementation of the power unit, the power unit in this embodiment is a motor with a self-locking function. The motor housing is fixed on the outer wall of the drive mounting housing 611, and the output shaft of the motor is connected to the adjustment shaft 612.

[0029] In another embodiment of the present invention, a plurality of guide components are provided between the annular adjusting plate 3 and the cavity 11. The plurality of guide components are arranged around the center of the cavity 11. The guide component is a guide rod 7, which is arranged along the axial direction of the fan hub 1. The two ends of the guide rod 7 are fixed to the inner walls of both sides of the fan hub 1. The annular adjusting plate 3 has a slot that matches the guide rod 7 and is slidably connected to the guide rod 7 through the slot.

[0030] Specifically, the sliding connector 53 is Y-shaped, with a jaw on one side, which slides and engages with the surface of the annular adjusting plate 3 at the other end. The other side is hinged to the swing arm 52. With the above arrangement, the annular adjusting plate 3 pulls the jaw of the sliding connector 53 during movement, causing it to move. Since the other side of the sliding connector 53 is hinged to the swing arm 52, the sliding connector 53 slides relative to the annular adjusting plate 3 when it pulls the sliding connector 53, causing the swing arm 52 to rotate around the axis of the blade shaft 51, thereby causing the blade 2 to rotate and adjust its angle.

[0031] Example 2 Based on Embodiment 1 and the same inventive concept, this embodiment discloses a method for adjusting the blade angle of a counter-rotating fan, which is implemented using the aforementioned counter-rotating fan blade angle adjustment mechanism, and includes the following steps: S1. The screw 41 in the screw drive assembly is driven to rotate synchronously by the synchronous rotation drive component, so that the annular adjusting plate 3 moves along the axial direction of the fan hub 1. S2. During the movement of the annular adjusting plate 3 along the axial direction of the wind turbine hub 1, the sliding connecting piece 53 in each swing part pulls the swing arm 52 to drive the blade shaft 51 to rotate, thereby synchronously driving multiple sets of swing parts to convert the linear movement of the annular adjusting plate 3 into the angular rotation adjustment of each blade 2.

[0032] In specific adjustments, such as Figure 4 As shown, first, taking the position where the swing arm 52 coincides with the annular adjusting plate 3 as 0°, the current position angle of the blade 2 is determined as follows: θ 1. The position to be adjusted for the annular adjusting plate 3 is as follows: θ 2. The length of the swing arm 52 is L The distance between the two endpoints of the swing arm 52 in the direction of the blade shaft 51 is L y, the projected length of the swing arm 52 is Lx , At each position of the annular adjusting plate 3 along the main shaft of the fan d Corresponding to the angle of blade 2 θ The formula for calculating the distance to blade 2 is shown below: Adjustment dial from θ Move to position 1 θ At position 2, the adjustment dial needs to be moved a certain distance. d As shown in the following formula: The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A counter-rotating fan blade angle adjustment mechanism, used to connect between a fan hub and a plurality of blades arranged circumferentially along the fan hub, characterized in that, The blade angle adjustment mechanism includes: The annular adjusting plate is coaxially set in the cavity opened inside the wind turbine hub; A movable adjustment unit, disposed on the cavity, is used to drive the annular adjustment plate to move axially along the wind turbine hub. It includes at least two sets of screw drive assemblies and a synchronous rotation drive component. The screw drive assembly includes a screw and a nut seat. The screw is disposed along the axial direction of the wind turbine hub, and the end of the screw is rotatably connected to the cavity. The nut seat is fixed on the annular adjustment plate, and the screw is threaded through and connected to the nut seat. The output end of the synchronous rotation drive component is connected to the screw in each screw drive assembly, and is used to drive each screw to rotate synchronously. Multiple sets of swinging parts are connected one-to-one between each blade and the annular adjusting plate to convert the linear movement of the annular adjusting plate into the angular rotation adjustment of each blade. Each swinging part includes a blade shank shaft, a swing arm, and a sliding connector. The blade shank shaft is rotatably connected to the fan hub, and both ends of the blade shank shaft are fixedly connected to the blade and the swing arm, respectively. The end of the swing arm away from the blade shank shaft is connected to the sliding connector, and the sliding connector is slidably connected to the edge of the annular adjusting plate.

2. The counter-rotating fan blade angle adjustment mechanism according to claim 1, characterized in that, The synchronous rotation drive includes: A rotation drive module is connected to the end of a lead screw in one of the lead screw drive assemblies, and is used to drive the lead screw to rotate around its own axis; The number of spur gears is the same as the number of lead screw drive components, and they are fitted and fixed on each lead screw in a one-to-one correspondence. A gear ring is coaxially disposed in the cavity, and the circumferential side wall of the gear ring with teeth meshes with each spur gear. An annular limiting guide rail is fixed inside the cavity. An annular limiting groove is formed on the circumferential side wall of the annular limiting guide rail. The circumferential side wall of the gear ring opposite to the teeth is slidably connected to the annular limiting groove.

3. The counter-rotating fan blade angle adjustment mechanism according to claim 2, characterized in that, The rotation drive module includes: The drive mounting housing is fixed to the end face of the wind turbine hub; An adjusting shaft is arranged perpendicular to the lead screw. One end of the adjusting shaft extends into the drive mounting housing and is rotatably connected to the drive mounting housing. The other end of the adjusting shaft extends out of the drive mounting housing and is connected to a power unit that drives it to rotate. The bevel gear transmission assembly includes a first bevel gear and a second bevel gear that mesh with each other. The first bevel gear is fixed to one end of the adjusting shaft, and one end of the lead screw extends through the fan hub and into the drive mounting housing, where it is fixed to the second bevel gear.

4. The counter-rotating fan blade angle adjustment mechanism according to claim 3, characterized in that, The power unit includes a handwheel and a locking structure. The handwheel is fixedly mounted on the end of the adjusting shaft, and the locking structure is an electromagnetic chuck, which is disposed between the drive mounting housing and the adjusting shaft.

5. The counter-rotating fan blade angle adjustment mechanism according to claim 3, characterized in that, The power unit is a motor with a self-locking function. The motor housing is fixed on the outer wall of the drive mounting housing, and the output shaft of the motor is connected to the adjustment shaft.

6. The counter-rotating fan blade angle adjustment mechanism according to claim 1, characterized in that, Multiple sets of guide components are provided between the annular adjusting plate and the cavity. The multiple sets of guide components are arranged around the center of the cavity. The guide component is a guide rod, which is arranged along the axial direction of the fan hub. The two ends of the guide rod are fixed to the inner walls of both sides of the fan hub. The annular adjusting plate has a slot that matches the guide rod, and is slidably connected to the guide rod through the slot.

7. The counter-rotating fan blade angle adjustment mechanism according to claim 1, characterized in that, The sliding connector is Y-shaped, with a jaw on one side, which slides and engages with the surface of the annular adjusting plate at the other end, and the other side is hinged to the swing arm.

8. A method for adjusting the blade angle of a counter-rotating fan, implemented using the counter-rotating fan blade angle adjustment mechanism as described in any one of claims 1 to 7, characterized in that, Includes the following steps: The synchronous rotation drive component drives the lead screw in the lead screw transmission assembly to rotate synchronously, causing the annular adjusting plate to move along the axial direction of the wind turbine hub. As the annular adjusting plate moves along the axial direction of the wind turbine hub, the sliding connectors in each swing part pull the swing arm to drive the blade shaft to rotate, thereby synchronously driving multiple sets of swing parts to convert the linear movement of the annular adjusting plate into the angular rotation adjustment of each blade.

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