Rotary centrifugal fan hub and blade device

Abstract

The utility model discloses a rotary centrifugal fan hub and blade device which comprises a hub body, three sets of hollowed-out grooves are formed in the hub body, connecting screws extending outwards are fixedly connected to the hollowed-out grooves, fan blades are detachably connected to the connecting screws, and the fan blades are fixedly connected to the hub body. Groove holes are formed in the ends, close to the hub body, of the fan blades, internal threads matched with the connecting screw rods are arranged in the groove holes and used for adjusting the distance between the fan blades and the hub body, and fixing devices are further arranged between the fan blades and the connecting screw rods. According to the utility model, the fan blades can be adjustably far away from or close to the hub body through thread rotation so as to adapt to the adjustment of the moment of force at the roots of the blades at different wind speeds; the blade is installed in a rotary mode, and the window period of installation and construction can be expanded. The screw rod of the hub of the device is made of high-strength light steel, so that the wind-resistant strength can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power generation fan equipment, in particular to a rotary centrifugal fan hub and blade device. Background Art

[0002] A wind turbine is a device that converts wind energy into electrical energy and is primarily composed of blades, a generator, mechanical components, and electrical components. Depending on the axis of rotation, wind turbines are primarily categorized into horizontal-axis and vertical-axis wind turbines. However, existing wind turbines experience significant torque at the blade root during power generation. The greater the distance from the blade root, the greater the torque generated. First, the blade root is susceptible to fatigue damage from long-term, complex loads. Excessive torque can cause cracks or even breakage at the blade root connection. Second, excessive torque at the blade root can cause forced vibration. If the blade's natural frequency is close to or equal to the external excitation frequency, resonance can occur, leading to a sharp increase in amplitude and vibration stress, potentially causing fatigue damage to the blade. Furthermore, excessive torque at the blade root can degrade the overall performance of the blade structure, and conventional blades are unable to drive the wind turbine at low wind speeds. Utility Model Content

[0003] In order to address the deficiencies in the prior art, a rotating centrifugal fan hub and blade device is provided to solve the problem of excessive torque on the blade root and the problem of being unable to drive the fan to rotate when the wind speed is low; as well as to solve the problem of high precision requirements and excessive difficulty in traditional blade docking during offshore installation.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a rotating centrifugal fan hub and blade device, including a hub body, three groups of hollow grooves are provided on the hub body, and the hollow grooves are fixedly connected to the connecting screws extending outward, and the fan blades are detachably connected to the connecting screws. A slot is provided on the fan blade near one end of the hub body, and an internal thread cooperating with the connecting screw is provided in the slot for adjusting the distance between the fan blade and the hub body. A fixing device is also provided between the fan blade and the connecting screw.

[0005] The fixing device comprises a fixing sleeve fixedly connected to the fan blade and arranged around the outer periphery of the slot hole. The diameter of the fixing sleeve is larger than the diameter of the slot hole. The fixing sleeve is provided with a plurality of fixing threaded holes.

[0006] The fixing device also includes a tightening nut arranged on the connecting screw, and the tightening nut can slide along the connecting screw through an internal thread. The tightening nut is provided with a plurality of through holes that cooperate with the fixing threaded holes. The tightening nut is also provided with a plurality of fixing bolts, and the fixing bolts pass through the through holes and are threadedly connected to the fixing threaded holes.

[0007] Preferably, the connecting screw is fixedly connected to the hollow groove on the hub body by welding.

[0008] Preferably, the connecting screw is made of high-strength lightweight steel.

[0009] The beneficial effects of the utility model are as follows: the utility model can adjust the fan blades away from or close to the hub body through thread rotation, adjust the torque of the blade root under different wind speeds, and improve the wind resource utilization ability; the screw rod of the hub of this device is high-strength lightweight steel, which can improve the wind resistance. When the wind speed is low, the distance between the blades and the hub body can be increased, the wind sweeping area can be increased, and the wind resource utilization ability of the fan can be improved. When the wind speed is high, the distance between the blades and the hub body can be reduced, the wind sweeping area can be reduced, and the typhoon resistance of the fan can be improved. The blade installation method is a rotary installation, which can expand the installation construction window period and can replace the variable pitch device of the fan. The screw rod of the hub of this device is high-strength lightweight steel, which can improve the wind resistance of the blade compared to common hollow blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the blade structure of the utility model;

[0012] Figure 3 This is a schematic diagram of the connecting screw structure of the utility model;

[0013] In the figure: 1. Hub body; 2. Hollow groove; 3. Connecting screw; 4. Fan blade; 5. Fixing sleeve; 6. Tightening nut; 7. Fixing bolt; 41. Slotted hole; 51. Fixing threaded hole. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1-3As shown, a rotating centrifugal fan hub and blade device includes a hub body 1, three groups of hollow grooves 2 are provided on the hub body 1, and the hollow grooves 2 are fixedly connected to the connecting screws 3 extending outward, and the fan blades 4 are detachably connected to the connecting screws 3. A slot 41 is provided on the fan blade 4 near one end of the hub body 1, and an internal thread that cooperates with the connecting screw 3 is provided in the slot 41 to adjust the distance between the fan blade 4 and the hub body 1. A fixing device is also provided between the fan blade 4 and the connecting screw 3. Compared with the traditional fan hub structure, this embodiment is fixed in the slot body of the hub. The connecting extension screw is used to adjust the distance between the fan blades. The extension screw replaces the blade to bear part of the torque, and a threaded connection structure is adopted to thread the fan blades and the hub body, making the installation operation simple and convenient for the staff to operate. At the same time, the outer surface of the connecting screw also increases the stability between the fan blade 4 and the connecting screw 3 through a fixed connection device. The fixed connection device is set through a detachable connection component to ensure that the fan blade 4 and the connecting screw 3 can be disassembled and replaced. During actual installation, the distance between the fan blade 4 and the hub body 1 can also be adjusted as needed to adapt to different torques under different wind speeds.

[0016] Preferably, the fixing device includes a fixing sleeve 5 fixedly connected to the fan blade 4 and arranged around the outer periphery of the slot 41. The diameter of the fixing sleeve 5 is larger than the diameter of the slot 41. A plurality of fixing threaded holes 51 are provided on the fixing sleeve 5. In this embodiment, in order to prevent the problem of loose connection between the fan blade 4 and the connecting screw 3 due to threaded connection, a fixing sleeve 5 is provided on the outer periphery of the slot 41 on the fan blade 4. The fixing sleeve 5 can be fixed to the fan blade 4 by welding or threaded connection. The diameter of the fixing sleeve 5 is larger than the diameter of the slot 41. During installation, the connecting screw 3 passes through the inside of the fixing sleeve 5 and is directly threadedly connected to the slot 41 of the fan blade 4. The fixing sleeve 5 is not provided with an internal thread. When the connecting screw 3 is connected to the fan blade 4, the fixing sleeve 5 is sleeved on the outer periphery of the connecting screw 3.

[0017] Preferably, the fixing device also includes a tightening nut 6 provided on the connecting screw 3, the tightening nut 6 can slide along the connecting screw 3 through the internal thread, the tightening nut 6 is provided with a plurality of through holes that match the fixing threaded holes 51, and the tightening nut 6 is also provided with a plurality of fixing bolts 7, the fixing bolts 7 pass through the through holes and are threadedly connected with the fixing threaded holes 51. In this embodiment, by providing a tightening nut 6 on the connecting screw 3, the tightening nut 6 can be adjusted to a position on the connecting screw 3 through the internal thread to match the fan blade 4 at different distances. During installation, the construction personnel confirm After setting the fan operating speed and determining the optimal distance between the fan blades 4 and the hub body 1, rotate and install the fan blades 4, and then screw the tightening nut 6 to the contact position with the fixing sleeve 5. At this time, the through hole on the tightening nut 6 is aligned with the fixing threaded hole 51 on the fixing sleeve 5. The staff screws the fixing bolt 7 into the fixing threaded hole 51 on the fixing sleeve 5 through the through hole. To prevent the fan blades 4 from detaching from the connecting screw 3 during rotation, the tightening direction of the fixing bolt 7 is set to be opposite to the threaded connection direction of the fan blade 4. The stability of the fan blade 4 and the connecting screw 3 is ensured by a number of fixing bolts 7.

[0018] Preferably, the connecting screw 3 is fixedly connected to the hollow groove 2 on the hub body 1 by welding. In this embodiment, the present application preferably uses welding to fix the connecting screw 3 to the hollow groove 2 on the hub body 1, but it can also be fixed with bolts commonly used in the construction field, or connected by French connection. Welding fixation consumes less working hours and can speed up the construction progress. However, when in use, in order to prevent the problem of deformation and weakening of the steel structure caused by long-term use of the connecting screw 3, a flange connection can be used to facilitate the replacement of the connecting screw 3.

[0019] Preferably, the connecting screw 3 is made of high-strength lightweight steel. The strength of high-strength lightweight steel is higher than that of traditional steel. The use of this material makes it less likely to produce plastic instability and damage when subjected to large forces. At the same time, the connecting screw 3 fixedly connected to the hub body 1 of the device is made of high-strength lightweight steel, which can improve the wind resistance. When in use, the blades are adjusted in advance according to weather warnings. When the wind speed is low, the distance between the blades and the hub body can be increased, the swept wind area can be increased, and the wind turbine's ability to utilize wind resources can be improved. When the wind speed is high, the distance between the blades and the hub body can be reduced, the swept wind area can be reduced, and the wind turbine's ability to resist typhoons can be improved.

[0020] Working principle of this application: When installing the utility model, the fan blade 4 is first threadedly connected to the connecting screw 3 through the internal thread of the slot 41. The distance between the fan blade 4 and the hub body 1 can be adjusted during the threaded connection. After the connection is completed, the nut 6 is tightened by rotating to fit tightly with the fixing sleeve 5 on the fan blade 4, and then the fixing bolt 7 is inserted through the through hole on the tightening nut 6. Several fixing bolts 7 are fixedly connected to the fixing sleeve 5 on the fan blade to ensure the stability of the overall fan blade 4 fixing screw 3. After assembly is completed, when in use, the distance between the fan blades 4 can be adjusted at any time as needed. At the same time, the detachable connection method is convenient for repairing and replacing the fan blades 4.

[0021] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A rotary centrifugal fan hub and blade device, comprising a hub body (1), wherein the hub body (1) is provided with three groups of hollow grooves (2), characterized in that: The hollow groove (2) is fixedly connected to a connecting screw (3) extending outward, and the connecting screw (3) is detachably connected to a fan blade (4), and a slot (41) is provided on one end of the fan blade (4) close to the hub body (1), and an internal thread that cooperates with the connecting screw (3) is provided in the slot (41) for adjusting the distance between the fan blade (4) and the hub body (1), and a fixing device is further provided between the fan blade (4) and the connecting screw (3), and the fixing device includes a fixing device fixedly connected to the fan blade (4) and provided around the outer periphery of the slot (41). A fixing sleeve (5) is provided, wherein the diameter of the fixing sleeve (5) is larger than the diameter of the slotted hole (41), and a plurality of fixing threaded holes (51) are provided on the fixing sleeve (5). The fixing device further comprises a tightening nut (6) provided on the connecting screw (3), wherein the tightening nut (6) can slide along the connecting screw (3) through an internal thread, and the tightening nut (6) is provided with a plurality of through holes that match the fixing threaded holes (51). The tightening nut (6) is also provided with a plurality of fixing bolts (7), and the fixing bolts (7) pass through the through holes and are threadedly connected to the fixing threaded holes (51).

2. A rotary centrifugal fan hub and blade assembly according to claim 1, characterized in that: The connecting screw (3) is fixedly connected to the hollow groove (2) on the hub body (1) by welding.

3. A rotary centrifugal fan hub and blade assembly according to claim 2, characterized in that: The connecting screw (3) is made of high-strength lightweight steel.

Images