CN105756863A - Wind power generator spindle with coupling and buffering functions - Google Patents

Abstract

A main shaft of a wind power generator with a coupling buffer function, the direction in which the main shaft is connected to the hub and the direction of the gearbox is respectively forward and backward, and is characterized in that the main shaft includes hub flanges, coupling The buffer spring connects the front seat, the transmission thread sleeve, the transmission thread rod, the buffer spring connects the back seat, the spline shaft and the gear box connection shaft, and the buffer spring connects the front seat and the buffer spring connects the back seat and also installs the buffer spring.

Description

A wind power generator main shaft with coupling buffer function

technical field

The invention relates to the field of wind power generator transmission, in particular to a wind power generator main shaft with a coupling buffer function.

Background technique

With the continuous development and utilization of wind energy, the installed capacity of wind power generators continues to increase, and the resulting problem is that the failure rate of wind power generators continues to increase. Through analysis, it is found that the part with the highest failure rate of wind power generators is the part of the wind power generator. The gearbox, and the reason for the high failure rate of the wind turbine gearbox is that the wind turbine is powered by random wind, so the power provided by it has random variability, so that the gear teeth in the gearbox are constantly impacted, and the gearbox The direct power input is transmitted through the main shaft, and the space around the main shaft in the engine room is relatively large, so designing the main shaft to reduce the impact between the gear teeth will reduce the failure rate of the gearbox, reduce losses, and improve Economic benefits are of great significance.

In order to reduce the impact of random wind to the greatest extent, the existing wind generators adopt the method of optimizing the control strategy and at the same time, it is more completed by installing buffer devices in other parts, but the buffering of the existing wind generators Most of the devices are suitable for vertical-axis wind power generators. For example, Chinese patent CN201510533906.4 discloses a synergistic buffer vertical-axis wind power generator. The device converts the reverse impact force received by the blade into the positive torque of the rotating shaft and transfers it to the rotating shaft to achieve the buffering effect. For the horizontal axis wind turbine, it is more difficult to buffer it because the axial force of the main shaft itself is not balanced. Therefore, it is an urgent problem to be solved in the prior art to provide a main shaft with a buffer function suitable for a horizontal axis wind turbine.

Contents of the invention

In order to overcome the deficiencies of the prior art, the impact between the gear teeth caused by the random wind and the bending stress generated by the main shaft due to the assembly error are alleviated.

The present invention provides a wind power generator main shaft with coupling and buffering function, the direction of connecting the main shaft to the hub and the connection to the gearbox is respectively forward and backward, and it is characterized in that the main shaft includes a hub method coaxially installed sequentially from front to back Lan, coupler, buffer spring connection front seat, transmission threaded sleeve, transmission thread rod, buffer spring connection rear seat, spline shaft and gearbox connection shaft, buffer spring connection front seat and buffer spring connection rear seat are also installed buffer springs;

The hub flange is provided with a hub installation hole 1.1 on the flange and a coupler installation hole at the end of the flange neck;

The coupler includes a coupling front plate, a front coupling spring plate, a coupling middle plate, a rear coupling spring plate and a coupling rear plate arranged in sequence from front to back and connected by bolts; the front end of the coupling front plate is connected by bolts to the hub On the coupler mounting hole of the flange, the end face of the coupled rear plate protrudes backwards along the axial direction to form a neck,

Thrust bearings and buffer springs are respectively set on the neck of the coupling rear disc to connect the front seat. The end face of the disc is in contact with the front end face of the buffer connection front seat; the buffer spring is connected to the front seat as an annular disc, and its central hole is the matching hole of the coupler rear seat, and the rear end face of the buffer spring connection front seat has N springs evenly distributed along the circumferential direction. Seat, the spring front mounting seat has a spring front mounting hole; the buffer spring is connected to the rear seat as an annular disc, and the front end surface of the buffer spring connected to the rear seat is close to the outer circumference and N spring rear mounting seats are evenly distributed along the circumferential direction, on the spring rear mounting seat It has a spring rear mounting hole, and the two ends of the buffer spring are respectively installed in the spring front mounting hole and the spring rear mounting hole; the central hole where the buffer spring is connected to the rear seat is the matching hole for the boss of the transmission threaded rod, and there are distributed along the circumference around the central hole. Screw spline shaft connecting hole;

The transmission threaded sleeve is a casing with transmission internal threads, and has a flange at the front end of the transmission threaded sleeve, and has a transmission threaded sleeve installation hole on the flange, and the transmission threaded sleeve is coupled with the transmission threaded sleeve through the transmission threaded sleeve installation hole. The rear end of the neck of the disc is fixedly connected; the outer surface of the transmission threaded rod has a transmission thread matched with the transmission thread sleeve, and the rear end of the transmission threaded rod has a flange and a transmission thread protruding from the rear end surface of the flange The rod boss has a transmission threaded rod installation hole on the end face of the flange. The traditional thread on the outer surface of the transmission threaded rod cooperates with the transmission threaded sleeve, and the transmission threaded rod installation hole cooperates with the screw spline shaft connection hole. The boss of the threaded rod extends into the matching hole of the boss of the transmission threaded rod connected to the rear seat by the buffer spring;

The outer surface of the spline shaft has splines, the front end of the spline shaft forms a flange, and the flange has a spline shaft installation hole, and the spline shaft installation hole and the transmission screw rod installation hole are respectively connected with the spline shaft connection hole of the screw rod. The two ends are matched and fixed by bolts;

The connecting shaft of the gearbox is a hollow shaft, and the inside of the connecting shaft of the gearbox is a coaxial spline hole. The inner surface of the spline hole has an internal spline that can cooperate with the spline. The rear end surface of the connecting shaft of the gearbox is distributed along the circumferential direction. The outer wall of the box connection shaft has a bolt insertion window near the rear end surface, and the bolt insertion window is used for insertion of bolts installed in the installation hole of the gearbox connection shaft.

The above-mentioned wind power generator main shaft with coupling and buffering function is characterized in that 4≤N≤8. Preferably N=6.

Compared with the prior art, the beneficial effect of the wind power generator main shaft with coupling and buffering function provided by the present invention is

1) Due to the role of the coupling spring in the coupler, even when the hub flange and the connecting shaft of the gearbox are poor in coaxiality, the gearbox will not be subjected to the bending stress borne by the main shaft of the fan; it can effectively resolve the problems generated during assembly. bending load, especially for horizontal axis wind turbines;

2) When the input power changes, due to the action of the thrust bearing, the connecting shaft of the gearbox will not change immediately with the change of the speed of the transmission threaded sleeve at the moment of power change, thus avoiding the drastic change of the output power of the connecting shaft of the gearbox;

3) When the input power increases, the transmission threaded sleeve and the transmission threaded rod will rotate relative to each other, which will cause the axial movement of the transmission threaded rod, so that the friction between the buffer spring connecting the front seat and the coupler will gradually increase. When the equilibrium state is reached , the connecting shaft of the gearbox starts to rotate synchronously with the coupler, and then drives the gearbox of the wind turbine to rotate, which can effectively resolve the instantaneous impact caused by the sharp increase in input power.

In summary, the provided wind turbine main shaft with coupling buffer function can ease the impact between the gear teeth caused by random wind and the bending stress caused by the main shaft due to assembly errors. It has a simple structure and good mechanical stability. The failure rate of the gearbox can be effectively reduced, and it is suitable for practical application and popularization.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of a hub flange of a wind turbine main shaft with a coupling buffer function according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a coupler of a wind turbine main shaft with a coupling buffer function according to an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a buffer spring connection front seat of a wind turbine main shaft with a coupling buffer function according to an embodiment of the present invention;

Fig. 5 is a structural schematic diagram of a buffer spring connection rear seat of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a gearbox connecting shaft of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention,

Fig. 7 is a full cross-sectional schematic diagram of a gearbox connecting shaft of a main shaft of a wind power generator with a coupling buffer function along the direction A-A in Fig. 6 according to an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a spline shaft of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

Fig. 9 is a structural schematic diagram of a transmission threaded rod of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

Fig. 10 is a structural schematic diagram of a transmission threaded sleeve of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

Fig. 11 is a schematic diagram of a working state structure of a main shaft of a wind power generator with a coupling buffer function according to an embodiment of the present invention;

in the picture

1. Hub flange, 1.1. Hub mounting hole, 1.2. Coupler mounting hole;

2. Coupler, 2.1, coupling front plate, 2.2, front coupling spring plate, 2.3, coupling middle plate, 2.4, rear coupling spring plate, 2.5, coupling rear plate;

3. Thrust bearing; 4. The buffer spring connects the front seat, 4.1, the front mounting seat of the spring, 4.2, the matching hole of the rear seat of the coupler;

5. Buffer spring; 6. Buffer spring is connected to the rear seat, 6.1, the connecting hole of the screw spline shaft, 6.2, the rear mounting seat of the spring, 6.3, the matching hole of the boss of the transmission threaded rod;

7. Gear box connecting shaft, 7.1, Bolt insertion window hole, 7.2, Gear box connecting shaft mounting hole, 7.3, Spline hole, 7.4, Internal spline;

8. Spline shaft, 8.1, spline, 8.2, spline shaft installation hole;

9. Transmission threaded rod, 9.1, Transmission thread, 9.2, Installation hole of transmission threaded rod, 9.3, Boss of transmission threaded rod;

10. Transmission thread sleeve, 10.1, Installation hole of transmission thread sleeve, 10.2, Transmission internal thread;

detailed description

Describe the present invention in detail below in conjunction with embodiment and accompanying drawing. The embodiment is based on the specific implementation carried out on the premise of the technical solution of the present invention, and provides detailed implementation methods and processes. However, the protection scope of the claims of the present application is not limited to the description of the following embodiments.

A wind turbine main shaft with coupling buffer function designed in the present invention (referred to as the main shaft, see Fig. 1-10) with the main shaft connected to the hub and the direction of the gearbox connected to the front and rear respectively, the main shaft includes a coaxial front Wheel hub flange 1, coupler 2, buffer spring connected to front seat 4, transmission threaded sleeve 10, transmission threaded rod 9, buffer spring connected to rear seat 6, spline shaft 8 and gearbox connecting shaft 7, buffer spring installed in sequence A buffer spring 5 is also installed between connecting the front seat 4 and the buffer spring to connect the rear seat 6;

The hub flange 1 (see Figure 1) is provided with a hub mounting hole 1.1 on the flange and a coupler mounting hole 1.2 at the end of the flange neck;

The coupler 2 (refer to Fig. 2 ) includes a coupling front plate 2.1, a front coupling spring plate 2.2, a coupling middle plate 2.3, a rear coupling spring plate 2.4 and a coupling rear plate 2.5 arranged in sequence and fastened by bolts; the front end of the coupling front plate The surface is connected to the coupler mounting hole of the hub flange by bolts, and the end surface of the coupling rear disc 2.5 protrudes backwards along the axial direction to form a neck.

A thrust bearing 3 and a buffer spring are respectively set on the neck of the coupling rear disc to connect the front seat 4, the thrust bearing and the buffer spring are connected to the front seat and the neck of the coupling rear disc is in clearance fit, and the seat ring and the shaft ring of the thrust bearing are respectively connected with the The end face of the coupling rear plate is in contact with the front end face of the buffer connection front seat; the buffer spring connection front seat 4 is an annular disc, and its central hole is the coupler back seat matching hole 4.2, and the rear end face of the buffer spring connection front seat has N evenly distributed along the circumference. A spring front mounting seat 4.1 has a spring front mounting hole on the spring front mounting seat. The buffer spring is connected to the rear seat as an annular disk, and the front end of the buffer spring to the rear seat is close to the outer circumference, and N spring rear mounting seats 6.2 are evenly distributed along the circumference. The spring rear mounting seat has a spring rear mounting hole, and the two ends of the buffer spring are Installed in the front mounting hole of the spring and the rear mounting hole of the spring; the central hole where the buffer spring is connected to the rear seat is the transmission threaded rod boss matching hole 6.3, and the screw spline shaft connection hole 6.1 is distributed along the circumference around the central hole;

The transmission threaded sleeve 10 is a casing with a transmission internal thread 10.2, a flange is provided at the front end of the transmission threaded sleeve, and a transmission threaded sleeve installation hole 10.1 is provided on the flange, and the transmission threaded sleeve passes through the transmission threaded sleeve installation hole It is fixedly connected with the rear end of the neck of the coupling rear disc. The outer surface of the transmission threaded rod has a transmission thread 9.1 matched with the transmission threaded sleeve, and the rear end of the transmission threaded rod has a flange and a transmission threaded rod boss 9.3 protruding from the rear end face of the flange. There is a transmission threaded rod installation hole 9.2, the traditional thread on the outer surface of the transmission threaded rod cooperates with the transmission threaded sleeve, the transmission threaded rod installation hole cooperates with the screw spline shaft connection hole, and the transmission threaded rod boss extends into the buffer spring connection The transmission threaded rod boss of the rear seat fits in the hole.

The outer surface of the spline shaft 8 has a spline 8.1, the front end of the spline shaft forms a flange, and the flange has a spline shaft installation hole 8.2, and the spline shaft installation hole 8.2 and the transmission threaded rod installation hole are respectively connected with the spline of the screw rod. The two ends of the shaft connection hole 6.1 are matched and connected by bolts.

The gearbox connecting shaft 7 is a hollow shaft, the inside of the gearbox connecting shaft is a coaxial spline hole 7.3, the inner surface of the spline hole has an internal spline 7.4 that can cooperate with the spline, and the rear end surface of the gearbox connecting shaft is distributed along the circumferential direction , there is a bolt throwing window 7.1 on the outer wall of the gear box connecting shaft close to the rear end, and the bolt throwing window is used for putting in bolts installed in the mounting hole 7.2 of the gear box connecting shaft.

Example

In this embodiment, N=6.

A wind turbine main shaft with coupling and buffering function in this embodiment, the overall structure diagram is shown in Figure 1, the hub flange structure diagram is shown in Figure 2, the coupler structure diagram is shown in Figure 3, the buffer spring connection The structure diagram of the front seat is shown in Figure 4, the structure diagram of the rear seat connected by the buffer spring is shown in Figure 5, the structure diagram of the gearbox connecting shaft is shown in Figure 6, and the full cross-sectional diagram of the gearbox connecting shaft along the axial direction is shown in Figure 7 , the structure diagram of the spline shaft is shown in Figure 8, the structure diagram of the transmission threaded rod is shown in Figure 9, the structure diagram of the transmission thread sleeve is shown in Figure 10, and the structure diagram of the working state is shown in Figure 11.

The working principle and process of a wind power generator main shaft (hereinafter referred to as the main shaft) with coupling buffer function provided by the present invention are as follows:

1) Due to the effect of the coupling spring in the coupler, even if the coaxiality between the hub flange and the gearbox connecting shaft is poor, the gearbox will not be subject to the bending stress of the fan main shaft;

2) When the input power changes, the hub flange drives the coupler to rotate, and then drives the transmission threaded sleeve to rotate. Due to the action of the thrust bearing, the buffer spring connects the front seat and the buffer spring at the moment of power change, and the buffer spring connects the rear seat, transmission The threaded rod, spline shaft, and gearbox connecting shaft will not rotate immediately with the transmission threaded sleeve, but will rotate synchronously with the buffer spring connecting the front seat 4, thereby avoiding the drastic change of the output power of the gearbox connecting shaft;

3) When the input power increases, the transmission threaded sleeve and the transmission threaded rod rotate relative to each other and cause the axial movement of the transmission threaded rod. The axial movement of the transmission threaded rod drives the buffer spring to connect the rear seat and the spline shaft to move forward, and the buffer spring The connecting front seat pushes the thrust bearing under the action of the buffer spring, so that the friction force between the buffer spring connecting the front seat and the coupler gradually increases. When the equilibrium state is reached, the gearbox connecting shaft starts to rotate synchronously with the coupler, and then drives The gearbox of the wind turbine turns.

In summary, the spindle provided by the present invention can relieve the impact load while relieving the bending stress, offset the instantaneous impulse and spring force, and achieve the effect of relieving both the bending load and the impact load.

Utilize the technical solution described in the present invention, or those skilled in the art design similar technical solutions under the inspiration of the technical solution of the present invention, and achieve the above-mentioned technical effects, all fall into the protection scope of the present invention.

Claims (3)

1. a wind driven generator principal shaft with coupling pooling feature, connect wheel hub with main shaft and connect the direction respectively forward and backward of gear-box, it is characterized in that described main shaft includes the coaxial mounted wheelboss flange of order, bonder, buffer spring from front to back and connects front stall, motion thread set, motion thread bar, buffer spring connection back seat, splined shaft and gear-box and connect axle, buffer spring connection front stall and buffer spring connect also installs buffer spring between back seat；

Wheelboss flange is provided with the hub installing hole on ring flange and is positioned at the bonder installing hole of neck flange end；

Bonder includes order from front to back and arranges and the coupling shroud being fastenedly connected by bolt, front coupling bomb reed, coupling telophragma, rear coupling bomb reed and coupling hub disk；The front end face of coupling shroud is bolted on the bonder installing hole of wheelboss flange, and coupling hub disk end face is prominent axially rearward forms cervical region,

The cervical region of coupling hub disk is set with thrust bearing and buffer spring connects front stall, it is matched in clearance with the cervical region coupling hub disk that thrust bearing and buffer spring connect front stall, and the front end face that the seat ring of thrust bearing connects front stall with the end face of coupling hub disk and buffering respectively with blowout patche contacts；It is annular disk that buffer spring connects front stall, and its centre bore is bonder back seat mating holes, and buffer spring connects the rear end face of front stall and has mounting seat before the N number of spring being uniformly distributed circumferentially, and has installing hole before spring before spring in mounting seat；It is annular disk that buffer spring connects back seat, buffer spring connect back seat front end face be uniformly distributed circumferentially N number of spring close to excircle after mounting seat, having installing hole after spring after spring in mounting seat, the two ends of buffer spring are separately mounted to before spring after installing hole and spring in installing hole；It is motion thread bar boss mating holes that buffer spring connects the centre bore of back seat, circumferentially has screw mandrel splined shaft connecting hole around centre bore；

Described motion thread set is the sleeve pipe with transmission female thread, in the leading section of motion thread set, there is flange, flange has motion thread set installing hole, described motion thread set by motion thread overlap installing hole with coupling hub disk cervical region rearward end fix be connected；The outer surface of described motion thread bar has the motion thread mated with motion thread set, the rearward end of motion thread bar has flange and protrudes the motion thread bar boss in flanged rear face, the end face of flange has motion thread bar installing hole, the conventional threads of the outer surface of described motion thread bar coordinates with motion thread set, motion thread bar installing hole coordinates with screw mandrel splined shaft connecting hole, and motion thread bar boss stretches in the motion thread bar boss mating holes that buffer spring connects back seat；

Splined shaft outer surface has spline, and the front end face of splined shaft forms flange, and flange has splined shaft installing hole, and splined shaft installing hole coordinates and is connected by bolt with the two ends of screw mandrel splined shaft connecting hole with motion thread bar installing hole respectively；

It is hollow axle that gear-box connects axle, gear-box connection axle inside is coaxial splined hole, splined hole inner surface has can with the internal spline of spline fitted, it is circumferentially distributed that gear-box connects shaft rear end face, connecting at gear-box and have bolt input fenestra on axle outer wall close to rear end face place, described bolt throws in fenestra for throwing in the bolt being arranged on gear-box connection axle installing hole.

2. a kind of as claimed in claim 1 have the wind driven generator principal shaft coupling pooling feature, it is characterized in that 4≤N≤8.

3. a kind of as claimed in claim 1 have the wind driven generator principal shaft coupling pooling feature, it is characterized in that N=6.