CN117189479A - Impeller locking method and mechanism and wind driven generator - Google Patents

Abstract

The application discloses an impeller locking method, a mechanism and a wind driven generator, which relate to the technical field of wind power generation and comprise a cabin capable of rotating relatively and an impeller, wherein the impeller comprises an impeller hub, rotating blades and a rotor, and the rotor is rotationally connected in the cabin and further comprises a friction groove and a friction locking mechanism; the friction groove is formed in the cabin; the friction locking mechanism is positioned in the friction groove and is in limiting connection with the rotor, and on the movement stroke of the friction locking mechanism, the friction force between the friction locking mechanism and the inner wall of the friction groove is increased stepwise, so that the friction locking mechanism locks the relative position of the rotor and the friction groove. According to the impeller locking mechanism provided by the application, when an emergency situation is met and the impeller is required to be locked, the friction force between the friction locking mechanism and the friction groove is increased stepwise, so that the rotating speed of the rotor in the cabin is reduced until the impeller stops rotating.

Description

Impeller locking method and mechanism and wind driven generator

Technical Field

The application relates to the technical field of wind power generation, in particular to an impeller locking method and mechanism and a wind power generator.

Background

The impeller is a basic component of the wind driven generator, can rotate under the action of wind force to generate power, and is required to be locked when the wind driven generator is overhauled or encounters strong wind weather, and the impeller is locked and is also required to be released in time after the operation is completed so as to ensure that the equipment can normally run.

If the authorized notice number is CN219119375U, the authorized notice day is 2023, 6 and 2 days, and the name is an authorized patent of "impeller locking mechanism for wind generating set and wind generating set", the wind generating set includes: main shaft, bearing frame and gear box, impeller locking mechanical system includes: the first locking part, the second locking part and the locking piece. The patent can obviously reduce the load born by the impeller locking mechanism, thereby greatly prolonging the service life of the impeller locking mechanism.

In the prior art, the impeller is generally locked by adopting a limiting pin, a limiting hole and other structures, the impeller is required to be used under the condition of low rotating speed, otherwise, the impeller is suddenly locked to cause certain impact and damage to the fan, and the limiting pin, the limiting hole and other mechanisms are required to be slowly aligned to complete locking, so that obviously, the locking mechanism is not suitable for locking the fan in operation to cope with emergency.

Disclosure of Invention

The application aims to provide an impeller locking method, an impeller locking mechanism and a wind driven generator, so as to solve the defects in the prior art.

In order to achieve the above object, the present application provides the following technical solutions:

an impeller locking mechanism comprising a nacelle capable of relative rotation and an impeller, the impeller comprising an impeller hub, rotating blades and a rotor, one end of the rotor being rotatably connected within the nacelle, further comprising:

a friction groove configured in the cabin;

the friction locking mechanism is positioned in the friction groove and is in limiting connection with the rotor, and on the movement stroke of the friction locking mechanism, the friction force between the friction locking mechanism and the inner wall of the friction groove is increased stepwise, so that the friction locking mechanism locks the relative position of the rotor and the friction groove.

The impeller locking mechanism comprises a movable groove formed in the rotor, friction blocks are slidably connected in the movable groove, a plurality of groups of extrusion pieces are arranged in the movable groove, and the extrusion pieces are used for applying pressure to the friction blocks.

According to the impeller locking mechanism, the plurality of groups of the extrusion pieces sequentially operate, so that the pressure born by the friction block is increased stepwise.

According to the impeller locking mechanism, the rotor is internally provided with the guide groove along the radial direction thereof, the guide groove is slidably connected with the guide rod, and the guide rod is fixed with the friction block.

In the impeller locking mechanism, a first spring is arranged between the friction block and the rotor, and the first spring is used for forcing the friction block to approach the rotor.

The extrusion piece comprises an extrusion spring and an extrusion piece, wherein the extrusion piece is slidably connected in the movable groove, the extrusion spring is used for forcing the extrusion piece to approach the friction piece, and the impeller locking mechanism further comprises a reset mechanism which is used for enabling a plurality of extrusion pieces to be located on one side of the sliding groove away from the friction piece.

According to the impeller locking mechanism, the first friction parts are formed in the inner wall of the sliding groove, the second friction parts are formed in the outer wall of the extrusion block, and the friction factors of the plurality of groups of second friction parts are increased step by step.

The impeller locking mechanism comprises a baffle plate, wherein the baffle plate is connected in the movable groove in a sliding manner along the radial direction of the rotor, and one sides, close to the baffle plate, of the extrusion blocks are respectively provided with a stop block.

An impeller locking method based on the impeller locking mechanism of any one of the above, comprising a locking step in which the frictional force between the friction locking mechanism and the nacelle is increased stepwise.

A wind power generator comprising the impeller locking mechanism of any one of the above.

In the technical scheme, when the impeller rotates normally, the friction braking mechanism can be driven to synchronously rotate in the friction groove, when the impeller is required to be locked in an emergency, the friction locking mechanism is started and has a certain movement stroke after being started, in the operation process, the friction force between the friction locking mechanism and the friction groove is increased stepwise, so that the rotating speed of the rotor in the cabin is reduced, the rotating speed of the rotor is enabled to be approximately zero, the friction locking mechanism continuously operates to lock the impeller, the cabin and the relative position until the impeller stops rotating, and the arrangement can limit the impeller in operation gradually, and finally the locking of the impeller is realized to cope with the emergency.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic diagram of an overall structure according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a rotor and nacelle structure provided by an embodiment of the application;

FIG. 3 is an enlarged schematic view of the structure shown in FIG. 2A according to an embodiment of the present application;

FIG. 4 is a schematic view of a structure of an extrusion block according to an embodiment of the present application;

FIG. 5 is a schematic view of the internal structure of an impeller hub according to an embodiment of the present application;

fig. 6 is a schematic diagram of a structure of a pitch gear according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a switching mechanism according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a connection portion according to an embodiment of the present application;

fig. 9 is a schematic view of a driving member and an extension portion according to an embodiment of the present application.

Reference numerals illustrate:

1. a nacelle; 2. an impeller hub; 3. rotating the blades; 4. a drive gear; 5. a pitch gear; 6. a movable block; 7. a transmission gear; 8. a connection part; 9. an arc-shaped groove; 10. a driving member; 11. a paddle rack; 12. an extension; 13. a first spring; 14. a connecting piece; 15. a return spring; 16. extruding a spring; 17. extruding a block; 18. a baffle; 19. a stop block; 20. a rotor; 21. a friction block; 22. a friction groove; 23. a guide rod; 24. a protruding block; 25. a trigger lever; 26. a fourth spring; 27. a first friction part; 28. and a second friction part.

Detailed Description

In order to make the technical scheme of the present application better understood by those skilled in the art, the present application will be further described in detail with reference to the accompanying drawings.

Referring to fig. 1-9, an embodiment of the present application provides an impeller locking mechanism, which comprises a nacelle 1 and an impeller capable of rotating relatively, wherein the impeller comprises an impeller hub 2, rotating blades 3 and a rotor 20, one end of the rotor 20 is rotatably connected in the nacelle 1, and further comprises a friction groove 22 and a friction locking mechanism; a friction groove 22 is configured in the nacelle 1; the friction locking mechanism is located in the friction groove 22 and is in limiting connection with the rotor 20, and on the movement stroke of the friction locking mechanism, the friction force between the friction locking mechanism and the inner wall of the friction groove 22 is increased stepwise, so that the friction locking mechanism locks the relative positions of the rotor 20 and the friction groove 22.

Specifically, the wind driven generator generally comprises a base, a tower, a cabin 1 and an impeller, wherein the impeller generally comprises an impeller hub 2, three rotary blades 3 and a rotor 20, the rotor 20 is fixed on the impeller hub 2 and extends to the cabin 1, the rotor 20 is rotationally connected with the cabin 1 through a bearing and is arranged in a matched mode with a stator in the cabin 1, the impeller is rotationally connected to one side of the cabin 1, and when wind power drives the impeller to integrally rotate, a power generation device between the impeller and the cabin 1 can generate power; when a fault or strong wind weather is encountered, the wind driven generator needs emergency braking, and at the moment, the impeller in operation needs to be locked; the innovation point of the embodiment of the application is that the friction locking mechanism is additionally and limitedly connected to the rotor 20, and can replace the impeller locking mechanism in the prior art, and can also be used as an auxiliary matched impeller locking mechanism for synchronous use, when the impeller rotates normally, the friction locking mechanism can be driven to rotate synchronously in the friction groove 22, when an emergency such as a fault or strong wind occurs, the friction locking mechanism is started, and has a certain movement stroke after the start, in the movement stroke, the friction force between the friction locking mechanism and the friction groove 22 is increased stepwise (the friction locking mechanism can be the combination of a plurality of groups of pressure components, and the friction force and the dynamic friction factor are related, so that the pressure of the plurality of groups of pressure components can be increased stepwise or the dynamic friction factor is increased stepwise, and the friction force between the friction locking mechanism and the inner wall of the friction groove 22 can be increased stepwise by sequentially starting the plurality of groups of pressure components, and the friction force between the impeller and the cabin 1 is increased by the friction locking mechanism when the impeller is locked, so that the impeller is decelerated stepwise until the impeller stops rotating, and the cabin 1 is continuously locked by the relative position and the emergency, and the cabin is locked, so that the emergency operation can be completed.

According to the impeller locking mechanism provided by the application, when the impeller normally rotates, the friction braking mechanism can be driven to synchronously rotate in the friction groove 22, when the impeller is required to be locked in an emergency, the friction locking mechanism is started, a certain movement stroke is provided after the friction locking mechanism is started, in the operation process, the friction force between the friction locking mechanism and the friction groove 22 is increased stepwise, so that the rotating speed of the rotor 20 in the engine room 1 is reduced, the rotating speed of the rotor 20 is enabled to be approximately zero, the friction locking mechanism continuously operates to lock the impeller, the engine room 1 and the relative position until the impeller stops rotating, and the arrangement can gradually limit the impeller in operation, and finally realize the locking of the impeller to cope with the emergency.

In still another embodiment of the present application, the friction locking mechanism further includes a movable slot configured in the rotor 20, the movable slot is slidably connected with the friction block 21, and a plurality of groups of pressing members are disposed in the movable slot, and the pressing members are used for applying pressure to the friction block 21, and the plurality of groups of pressing members sequentially operate, so that the pressure applied to the friction block 21 increases in a stepwise manner. Specifically, the plurality of groups of pressing members are positioned on one side of the friction block 21 near the center of the rotor 20; the friction groove 22 is integrally formed as a circular groove, and the outer circumferential surface of the friction groove 22 and the outer surface of the friction block 21 are both formed as rough surfaces; when the rotor 20 normally operates, the friction block 21 is positioned in the movable groove, the friction block 21 is not contacted with the inner wall of the friction groove 22, and the impeller can normally rotate on the engine room 1 through the rotor 20; when an emergency situation is met and the impeller is required to be braked, a plurality of groups of extrusion pieces (a plurality of groups of extrusion pieces can be a plurality of groups of hydraulic rods) are started in sequence, and when a first group of extrusion pieces are started, the friction block 21 is extruded and slides to a position attached to the peripheral surface of the friction groove 22, so that a certain friction force can be provided through the friction block 21 and the friction groove 22, and the impeller is enabled to be primarily decelerated; when the follow-up extrusion piece starts in order, the extrusion force that friction block 21 received increases for friction block 21 further compresses tightly the outer peripheral face of movable groove, thereby improves the frictional force between friction block 21 and the movable groove inner wall, and then makes the impeller slow down step by step, finally realizes the braking to the impeller, after the impeller braking, friction block 21 continuously extrudees the movable groove outer peripheral face, so can lock the impeller continuously.

Still further, a guide groove is formed in the rotor 20 along a radial direction thereof, a guide rod 23 is slidably connected in the guide groove, and the guide rod 23 is fixed with the friction block 21. A return spring 15 is arranged between the friction block 21 and the rotor 20, and the return spring 15 is used for forcing the friction block 21 to approach the rotor 20. Specifically, the guide groove and the guide bar 23 are both disposed in the radial direction of the rotor 20, so that the friction block 21 can move in the radial direction of the rotor 20 through the guide bar 23 and the guide groove; one end of the reset spring 15 is fixed on the inner wall of the movable groove, the other end of the reset spring 15 is fixed on the friction block 21, the friction block 21 can be pulled into the movable groove through the reset spring 15, when the extrusion piece runs, the friction block 21 is extruded and moves to one side far away from the rotor 20 along the guide groove, so that the friction block 21 is attached to the inner wall of the friction groove 22, the reset spring 15 is stretched in the process until the extrusion piece is reset, and the friction block 21 can be reset into the movable groove under the action of the reset spring 15; when the fan normally operates, wind force is high, the rotating speed of the impeller is high, the rotor 20 and the friction block 21 rotate too fast, a certain centrifugal force is generated, the friction block 21 moves to the side far away from the rotor 20 and stretches the return spring 15, when the rotating speed of the impeller exceeds a certain range, the friction block 21 stretches the return spring 15 and moves to a position attached to the peripheral surface of the friction groove 22, so that the friction force of the impeller when the impeller rotates around the engine room 1 is increased, the rotating speed of the impeller is reduced as much as possible, and overload operation of the fan is avoided as much as possible.

Preferably, the extrusion comprises an extrusion spring 16 and an extrusion block 17, the extrusion block 17 is slidably connected in the movable groove, the extrusion spring 16 is used for forcing the extrusion block 17 to approach the friction block 21, and the extrusion device further comprises a reset mechanism for enabling a plurality of extrusion blocks 17 to be located on one side of the sliding groove away from the friction block 21. Specifically, a plurality of sliding grooves are formed in the movable groove along the radial direction of the rotor 20, the extrusion block 17 is slidably connected in the corresponding sliding groove, an extrusion spring 16 is arranged in the sliding groove, one end of the extrusion spring 16 is fixed on the inner wall of the sliding groove (namely the inner wall of the movable groove), the other end of the extrusion spring 16 is fixed on the extrusion block 17, the extrusion block 17 can be forced to approach the friction block 21 through the extrusion spring 16 and extrude the friction block 21 (the elastic force of the extrusion spring 16 is larger than that of the return spring 15), so that the friction block 21 is attached to the inner wall of the friction groove 22; when the impeller and the rotor 20 normally operate, the plurality of extrusion blocks 17 can move to one side far away from the friction block 21 along the sliding groove through the reset mechanism (the reset mechanism can be a combination of an electromagnet and an iron block, such as the electromagnet is arranged in the sliding groove, the iron block is arranged on the extrusion block 17, and the lamination and the extrusion block 17 can be attracted to one side far away from the friction block 21 of the sliding groove through the electromagnet, at the moment, the plurality of extrusion blocks 17 do not extrude the friction block 21, so that the friction block 21 can move into the movable groove under the action of the reset spring 15; when an emergency situation is met and the impeller is required to be locked, the reset mechanism sequentially releases the limit on the plurality of extrusion blocks 17 (the plurality of electromagnets can sequentially release the limit on the plurality of extrusion blocks 17 when being sequentially powered off), so that the extrusion blocks 17 can sequentially extrude the friction blocks 21 under the action of the extrusion springs 16, the friction blocks 21 sequentially abut against the inner wall of the friction groove 22, and the impeller is gradually decelerated until the impeller is locked when stopping rotating; when the locking of the impeller needs to be released, the plurality of extrusion blocks 17 are reset to one side of the sliding groove far away from the friction blocks 21 through the reset mechanism, so that the friction plate is reset under the action of the reset spring 15, friction force between the friction plate and the inner wall of the friction groove 22 is eliminated, and the impeller can normally rotate.

In order to sequentially release the restriction on the extrusion block 17, the reset mechanism needs to be operated sequentially (for example, the plurality of electromagnets are sequentially powered off), and as an alternative or a parallel arrangement of the electromagnet and the iron block structure, further, the inner wall of the chute is configured with a first friction portion 27, the outer wall of the extrusion block 17 is configured with a second friction portion 28, and friction factors of a plurality of groups of the second friction portions 28 are gradually increased. Specifically, the inner wall of the chute is a smooth surface except the first friction part 27, and the outer wall of the extrusion block 17 is a smooth surface except the second friction part 28; the first friction part 27 and the second friction part 28 are contacted with each other until the first friction part 27 and the second friction part 28 are not contacted after the extrusion block 17 is abutted against the friction block 21; the multiple groups of second friction parts 28 can adopt different materials to enable the second friction parts 28 to have different friction factors (the rougher the surface of the material is, the larger the friction factors are generally), so that the reset mechanism can remove the limitation on all extrusion blocks 17 at one time, the different extrusion blocks 17 are provided with second friction parts 28 with different friction factors (namely, the different roughness degree), when the reset mechanism synchronously removes the limitation on all extrusion blocks 17, the multiple extrusion blocks 17 move towards one side of the friction block 21 under the action of the extrusion springs 16, the extrusion blocks 17 with the second friction parts 28 with smaller friction factors can firstly collide with the friction blocks 21 and extrude the friction blocks 21 (the second friction parts 28 with larger friction factors are rougher, the resistance born by the second friction parts 28 when moving along the sliding grooves is larger, the rougher second friction parts 28 slide along the sliding grooves at a slower speed under the action of the same extrusion springs 16), then the other extrusion blocks 17 can sequentially extrude the friction blocks 21 (when the extrusion blocks 17 extrude the friction blocks 21, the first friction parts 27 and the second friction parts 28 are not contacted with the extrusion springs 21, and the friction blocks 21 can only be extruded by the extrusion springs 21 step by step, and the friction blocks 21 can be extruded by step by the friction blocks 21 are only being increased.

It should be noted that in this embodiment, the friction factor of the second friction portion 28 may be increased step by step, or the friction factor of the first friction portion 27 may be increased step by step, or both the two may be combined to enable the plurality of sets of extrusion blocks 17 to extrude the friction blocks 21 successively, so as to achieve the purpose of increasing the friction force between the friction blocks 21 and the inner wall of the friction groove 22 step by step.

Preferably, the reset mechanism includes a baffle 18, the baffle 18 is slidably connected in the movable slot along the radial direction of the rotor 20, one side of the plurality of extrusion blocks 17 close to the baffle 18 is configured with a stop 19, when the baffle 18 slides along the movable slot towards the center of the rotor 20 (a linear driving mechanism can be arranged in the movable slot to drive the baffle 18 to move along the movable slot, which is not described herein), the baffle 18 can simultaneously abut against the plurality of stop 19 and drive the plurality of extrusion blocks 17 to synchronously move towards one side far away from the friction block 21, and when the baffle 18 slides along the movable slot towards the friction block 21, the baffle 18 simultaneously releases the limitation on the plurality of extrusion blocks 17, so that the plurality of extrusion blocks 17 can sequentially extrude the friction block 21 under the dual actions of the extrusion springs 16 and the friction surfaces.

In another embodiment provided by the application, the device further comprises a first driving mechanism, a second driving mechanism and a switching mechanism; the first driving mechanism is used for driving the rotating blades 3 to rotate on the impeller hub 2; the second driving mechanism is used for driving the rotating blades 3 to perform pitch-up; the switching mechanism selects the first driving mechanism and the second driving mechanism to drive the rotary blade 3.

Specifically, when the fan runs, the fan monitors data such as wind direction and wind speed, so that the angle of the rotating blade 3 is changed according to the situation (the angle of the rotating blade 3 is adjusted through the variable pitch control mechanism), and if the situation that the wind force is small is met, the angle of the rotating blade 3 can be adjusted to increase the windward area of the rotating blade 3, so that the output power of the fan is increased; the angle of the rotary blade 3 is generally adjusted between 0 degrees and 90 degrees, in this embodiment, 0 degrees means that the rotary blade 3 is parallel to the axis of the nacelle 1, the rotary blade 3 is basically parallel to the wind direction and the windward area is minimum, and 90 degrees means that the blade is perpendicular to the axis of the fan, and the windward area of the rotary blade 3 is maximum; when encountering faults and strong wind weather, in order to improve the safety of the fan, the impeller is generally required to be braked and the fan is subjected to slurry collection, namely, the rotating blades 3 are rotated to the position of 0 degrees, and at the moment, the rotating blades 3 are basically parallel to the wind direction, the windward area is minimum, and the influence of wind force on the impeller can be reduced to the greatest extent.

The impeller hub 2 is internally provided with a certain space, a plurality of groups of first driving mechanisms and second driving mechanisms (preferably three groups are arranged in the impeller hub 2 so as to correspond to three rotating blades 3, namely, one rotating blade 3 is correspondingly provided with a first driving mechanism and one second driving mechanism, a switching mechanism is arranged between the first driving mechanism and the second driving mechanism so as to select one of the first driving mechanism and the second driving mechanism to drive the rotating blade 3), when the fan normally operates, the first driving mechanism (the first driving mechanism and the second driving mechanism can adopt a speed reducing motor structure in the prior art) can adjust the angle of the rotating blade 3 according to the situation so as to improve the utilization efficiency of wind energy, when the fan encounters a fault or strong wind weather and other situations requiring emergency harvest, the second driving mechanism is selected to drive the rotating blade 3 (the switching mechanism can be a transmission piece, and the first driving mechanism and the second driving mechanism are in a receiving way through changing positions), so that the first driving mechanism and the second driving mechanism drive the rotating blade 3 to perform paddle rotation, and when the fan normally operates, the first driving mechanism and the second driving mechanism can drive the rotating blade 3 to rotate in response time (the speed reducing motor structure in the prior art is required to suddenly and the emergency response time is reduced when the fan encounters the emergency condition requiring the speed reducing motor to meet the emergency condition; if the gear motor is driving the rotating blade 3 to rotate to 90 degrees, the gear motor also needs to change direction to drive the rotating blade 3 to rotate reversely, which requires longer response time, so as to increase the pitch speed of the fan and stop the fan as soon as possible.

Further, the first driving mechanism includes a driving gear 4 rotatably coupled in the impeller hub 2 and a pitch gear 5 fixed to the rotating blades 3. Specifically, the pitch gear 5 is an internal gear, the diameter of the driving gear 4 is smaller than that of the pitch gear 5, the driving gear 4 is located in the pitch gear 5, and when the driving gear 4 is in transmission connection with the pitch gear 5, the driving gear 4 rotates to drive the pitch gear 5 and the rotating blades 3 to rotate on the impeller hub 2 (the power of the driving gear 4 can be a gear motor arranged in the impeller hub 2, which is not shown in the prior art), so that the angle of the rotating blades 3 is adjusted.

Still further, the switching mechanism includes the movable block 6 of sliding connection in impeller hub 2, be connected with drive gear 7 on the movable block 6 rotation, on the gear shaft of drive gear 7 is connected in the rotation on the movable block 6 promptly, when drive gear 7 meshes with drive gear 4 and pitch gear 5 simultaneously, movable block 6 is in the drive position. Specifically, the transmission gear 7 slides in the impeller hub 2 through the movable block 6 (the sliding connection mode is the prior art and is not described in detail herein), the transmission gear 7 is positioned in the pitch gear 5, when the fan normally operates, the driving gear 4 and the pitch gear 5 are both meshed with the transmission gear 7, and at the moment, the driving gear 4 can drive the pitch gear 5 to rotate through the transmission gear 7 when rotating, so that the angle of the rotating blade 3 is adjusted; when the fan needs emergency blade retraction, the driving movable block 6 slides in the impeller hub 2 (the power for driving the movable block 6 to slide can be an electric push rod in the prior art, which is not repeated here), so that the movable block 6 is separated from the driving position, and at the moment, the transmission gear 7 is not meshed with the driving gear 4 and the blade-changing gear 5 any more, so that the blade-changing gear 5 can rotate under the driving of the second driving mechanism to directly drive the rotary blade 3 to rotate to the position of 0 degrees, and the power source of the blade-changing mechanism can be switched from the first driving mechanism to the second driving mechanism.

Preferably, the impeller hub 2 is internally provided with an arc-shaped groove 9, and the movable block 6 is slidably connected in the arc-shaped groove 9. Specifically, a connecting part 8 is constructed in the impeller hub 2, an arc-shaped groove 9 is constructed on the connecting part 8, the arc-shaped groove 9 is a part of a circular groove taking the central axis of the pitch gear 5 as the center of a circle, namely, when the movable block 6 slides along the arc-shaped groove 9, the transmission gear 7 is always meshed with the pitch gear 5; the driving gear 4 is positioned above the arc-shaped groove 9, when the movable block 6 moves to the top end of the stroke of the movable block along the arc-shaped groove 9, the movable block 6 is positioned at a driving position, and at the moment, the driving gear 4 and the pitch gear 5 are both meshed with the transmission gear 7; when the movable block 6 moves downwards along the arc-shaped groove 9, the movable block is separated from the driving position, and at the moment, the transmission gear 7 is only meshed with the pitch gear 5; so set up for the switching mechanism operation back, second actuating mechanism can also directly drive pitch gear 5 through drive gear 7 (second actuating mechanism can be the gear structure who sets up in impeller hub 2, when movable block 6 moves along arc groove 9, drive gear 7 can alternatively dock with drive gear 4 and gear structure to drive pitch gear 5), be convenient for switch pitch mechanism's power supply.

Further, the second driving mechanism comprises a driving piece 10 which is slidably connected in the impeller hub 2, a paddle collecting rack 11 is fixed on the driving piece 10, and when the transmission gear 7 is meshed with the paddle collecting rack 11 and the paddle changing gear 5, the movable block 6 is in a paddle collecting position. Specifically, a driving groove is formed in the impeller hub 2 along the axial direction of the impeller hub, a driving piece 10 is slidably connected in the driving groove (a power source for sliding the driving piece 10 along the driving groove can be a hydraulic rod arranged in the driving groove, which is not described in detail in the prior art), the driving groove is formed with openings corresponding to the positions of three pitch gears 5, the driving piece 10 is formed with an extension part 12 (as shown in fig. 8) adapted to the positions of the three openings, and a pitch rack 11 is fixed or arranged on the extension part 12; when the movable block 6 moves to the bottom of the stroke along the arc-shaped groove 9, the movable block 6 is positioned at a pitch-collecting position, and at the moment, the transmission gear 7 is meshed with the pitch-collecting rack 11 and the pitch-changing gear 5; so set up, when the fan needs urgent receipts oar, move movable block 6 to receipts oar position earlier, then make driving piece 10 remove along the drive groove to drive three extension 12 and three receipts oar rack 11 synchronous motion, and then drive corresponding drive gear 7 and become oar gear 5 rotation through three receipts oar rack 11, with this synchronous receipts oar of accomplishing three rotary blade 3.

In another embodiment provided by the application, the switching mechanism further comprises a first spring 13 arranged in the arc-shaped groove 9, the first spring 13 is used for forcing the movable block 6 to be in a driving position, a connecting piece 14 is fixed on the driving piece 10, and a bevel part is constructed on the connecting piece 14. Specifically, one end of the first spring 13 is fixed on the inner wall of the arc-shaped groove 9, the other end of the first spring 13 is fixed on the movable block 6, and the movable block 6 can press the first spring 13 and enable the first spring 13 to store elastic potential energy when moving downwards along the arc-shaped groove 9; the connecting piece 14 is integrally constructed along the length direction of the driving piece 10 (or the extending part 12), one end of the connecting piece 14, which is far away from the movable block 6, is fixed on the extending part 12 of the driving piece 10 (namely, the connecting piece 14 is fixed on the driving piece 10 through the extending part 12), the connecting piece 14 is synchronously driven to move when the driving piece 10 moves along the driving groove, the connecting piece 14 presses the movable block 6 through the inclined surface part of the connecting piece 14 (part of the movable block 6 protrudes out of the connecting part 8, so that the inclined surface part can press part of the movable block 6), and the movable block 6 presses the first spring 13 and moves downwards along the arc-shaped groove 9; the function of the arrangement is that when the fan needs emergency paddle retraction, the driving piece 10 is directly moved along the driving groove, the driving piece 10 can squeeze the arc-shaped block at the beginning of the movement through the connecting piece 14 so as to force the movable block 6 to move to the bottom end of the stroke (the bottom end of the stroke is not the bottom end of the arc-shaped groove 9), so that the movable block 6 moves from the driving position to the paddle retraction position, namely, the transmission gear 7 is meshed with the paddle retraction rack 11 at the moment, and then the driving piece 10 can continuously move so as to drive the paddle retraction rack 11 to move (the connecting piece 14 synchronously moves when the driving piece 10 continuously moves so as to synchronously conflict the movable block 6, thereby forcing the movable block 6 to be stably positioned at the paddle retraction position until the connecting piece 14 is separated from the movable block 6 after the driving piece 10 is reset, and then the movable block 6 can be reset to the driving position under the elastic force of the first spring 13, and then the transmission gear 7 and the paddle retraction gear 5 are driven to rotate through the paddle retraction rack 11 so as to finish the adjustment of the angle of the rotating blade 3; the advantage is that the power source for driving the movable block 6 to slide can be omitted by arranging the connecting piece 14 and the inclined surface part, so that the position of the movable block 6 can be passively switched at the moving position of the driving piece 10.

As an alternative or in parallel to the above-described linear drive mechanism for driving the shutter 18 to move along the movable groove, it is preferable that the drive groove is constructed in the axial direction of the rotor 20, that is, the driver 10 is located inside the rotor 20 and is movable in the axial direction of the rotor 20; the driving piece 10 is provided with a protruding block 24, a trigger rod 25 is arranged in the movable groove along the radial direction of the rotor 20, one end of the trigger rod 25 extends to the protruding block 24 (namely, the movable groove is communicated with the driving groove, the trigger rod 25 is positioned at the communicating position of the movable groove and the driving groove), the other end of the trigger rod 25 is fixed with the baffle 18, wedge-shaped parts are respectively formed on the protruding block 24 and the trigger rod 25, a fourth spring 26 is sleeved on the trigger rod 25, one end of the fourth spring 26 is fixed on the trigger rod 25, the other end of the fourth spring 26 is fixed on the inner wall of the movable groove, and the elastic force of the fourth spring 26 is larger than the elastic force of the plurality of extrusion springs 16 and the resistance of the first friction part 27 and the second friction part 28 which are born by the reset of the plurality of groups of extrusion blocks 17. Specifically, the driving piece 10 is located in a driving groove inside the rotor 20, when the fan needs to perform emergency blade collection, the driving piece 10 moves along the driving groove to drive the plurality of rotating blades 3 to perform blade collection, meanwhile, at the beginning of the movement of the driving piece 10, the protruding block 24 moves synchronously with the driving piece 10 and extrudes the wedge-shaped part of the trigger rod 25 through the wedge-shaped part of the protruding block 24, so that the trigger rod 25 moves to one side far away from the guide groove and extrudes the fourth spring 26, thereby driving the baffle 18 to release the restriction on the plurality of extrusion blocks 17, so that the plurality of extrusion blocks 17 can sequentially extrude the friction blocks 21 (the baffle 18 and the extrusion blocks 17 move along the radial direction of the rotor 20, the moving speed of the baffle 18 is higher, and the moving speed of the plurality of extrusion blocks 17 due to the existence of friction surfaces is slightly slower, namely, the baffle 18 does not affect the plurality of extrusion blocks 17 to sequentially extrude the friction blocks 21), and friction force between the friction blocks 21 and the inner wall of the friction groove 22 is gradually increased, thereby rapidly enabling the rotating blades 3 to perform blade collection and impeller locking; until the driving piece 10 resets, the fourth spring 26 drives the baffle 18 to reset, the baffle 18 drives the plurality of stop blocks 19 and the extrusion blocks 17 to reset, so that the reset spring 15 can drive the friction blocks 21 to reset, and the impeller hub 2 can normally rotate around the engine room 1.

Still another embodiment of the present application further provides an impeller locking method, which is based on the impeller locking mechanism of any one of the above, and includes a locking step, in which a friction force between the friction locking mechanism and the nacelle 1 is increased stepwise.

Another embodiment of the present application also provides a wind turbine comprising an impeller locking mechanism according to any one of the above.

While certain exemplary embodiments of the present application have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the application. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the application, which is defined by the appended claims.

Claims (10)

1. An impeller locking mechanism, includes cabin and impeller that can relative rotation, the impeller includes impeller hub, rotating vane and rotor, the one end of rotor rotates to be connected in the cabin, its characterized in that still includes:

a friction groove configured in the cabin;

the friction locking mechanism is positioned in the friction groove and is in limiting connection with the rotor, and on the movement stroke of the friction locking mechanism, the friction force between the friction locking mechanism and the inner wall of the friction groove is increased stepwise, so that the friction locking mechanism locks the relative position of the rotor and the friction groove.

2. The impeller lock mechanism of claim 1, wherein the friction lock mechanism includes a movable slot configured in the rotor, the movable slot having a friction block slidably coupled thereto, a plurality of sets of pressers disposed in the movable slot, the pressers being configured to apply pressure to the friction block.

3. An impeller lock according to claim 2, wherein a plurality of said pressing members are operated in sequence to increase the pressure applied to the friction block stepwise.

4. An impeller lock according to claim 3, wherein the rotor is internally provided with a guide groove formed along a radial direction thereof, and a guide rod is slidably connected to the guide groove, and the guide rod is fixed to the friction block.

5. An impeller lock according to claim 3, wherein a first spring is provided between the friction block and the rotor, the first spring being arranged to urge the friction block towards the rotor.

6. The impeller lock mechanism of claim 3, wherein said pressing member includes a pressing spring and a pressing block, said pressing block being slidably connected in the movable groove, said pressing spring being adapted to urge the pressing block toward the friction block, and a return mechanism for positioning a plurality of said pressing blocks on a side of the slide groove away from the friction block.

7. The impeller lock mechanism of claim 6, wherein said runner inner wall is configured with a first friction portion and said squeeze block outer wall is configured with a second friction portion, and wherein the friction factors of said plurality of sets of second friction portions are increased stepwise.

8. The impeller lock mechanism of claim 6, wherein said return mechanism includes a baffle slidably coupled in the radial direction of the rotor within the movable slot, and wherein a plurality of said squeeze blocks are each configured with a stop on a side thereof adjacent the baffle.

9. An impeller locking method based on an impeller locking mechanism according to any one of claims 1-8, comprising a locking step, characterized in that in the locking step the friction between the friction locking mechanism and the nacelle is increased stepwise.

10. A wind power generator comprising the impeller locking mechanism of any one of claims 1-8.