CN1862011A - Wedge block inserted type off course brake of wind electricity generator - Google Patents

Abstract

The utility model relates to a wedge-shaped plug-in type yaw brake device of a wind-driven generator, which belongs to a mechanical brake device of a wind-driven machine yaw brake electrically or hydraulically driven with the action of a spring. The device is to install a wedge block and its driving device matched with the yaw gear on the side of the non-yaw gear bearing ring; or install a brake chainring, a wedge block and its driving device on the fixed part and the rotating part respectively. The device not only has simple structure, requires little operating force, reliable braking, and low cost, but also is easy to realize "fail safe" design.

Description

Wedge block plug-in type yaw brake device for wind power generator

technical field

The invention relates to a yaw braking device of a wind power generator, in particular to a plug-in yaw braking device of a wind power generator, which belongs to the technical field of wind power generation equipment. .

Background technique

The existing yaw braking adopts a hydraulic brake, and the friction plate of the brake is pressed against the brake ring under oil pressure, and the braking force is provided by the friction between the two. The main disadvantages of this type of brake are: 1. High oil pressure is required: 14-16MPa, so a special high-pressure hydraulic system is required. ②The brake ring must be kept clean. Due to the harsh natural environment and the leakage of hydraulic oil, lubricating oil, etc. that cannot be completely avoided, the friction coefficient will be greatly reduced and the reliability of braking will be reduced. ③The brake ring may be deformed, causing additional friction when braking is not required, and increasing the resistance of yaw driving. ④The system structure is more complex and the cost is higher. ⑤ Difficult to adopt "fail-safe" design. Considerable friction is required between the pads and the brake ring, and it is difficult to generate such a high pressure using a spring.

Contents of the invention

Aiming at the deficiencies and defects existing in the existing wind turbine yaw braking technology, the present invention provides a wedge-shaped plug-in type yaw brake device for wind power generators, which not only has a simple structure, requires little operating force, and is easy to brake. Reliable, inexpensive, and easy to implement "fail-safe" designs.

Technical scheme of the present invention is as follows:

The invention provides a wedge block plug-in yaw braking device for a wind power generator, which includes a slewing support mechanism of an outer yaw gear, a nacelle base and a tower, and is characterized in that several yaw brakes are installed on the nacelle base A wedge block matched with gears and a driving device for driving the wedge block.

The second type of wedge block plug-in yaw braking device for wind power generators provided by the present invention includes the slewing support mechanism of the inner yaw gear, the base of the nacelle and the tower, and is characterized in that: The wedge block matched with the aviation gear and the driving device for driving the wedge block.

The third wedge-shaped plug-in yaw braking device for wind power generators provided by the present invention includes a slewing support mechanism for inner or outer yaw gears, a nacelle base, a tower, and a brake disc, and is characterized in that: the brake disc A circle of teeth is made on the inner ring or the outer ring, and several wedge blocks matched with the tooth shapes and a driving device for driving the wedge blocks are installed on the base of the nacelle.

The fourth plug-in type yaw braking device of a wind power generator provided by the present invention includes a slewing support mechanism of an inner or outer yaw gear, a nacelle base, and a tower, and is characterized in that the device includes a yaw gear With the toothed plate fixed to the tower, several wedge blocks matched with the toothed plate and the driving device for driving the wedge block are installed on the nacelle base.

The wedge block plug-in yaw brake device of the wind power generator according to the present invention is characterized in that the drive device is a hydraulic or electromagnetic coil drive device. The wedges are single-tapered wedges, double-tapered wedges, or wedges with cylindrical tops.

Compared with the prior art, the present invention has the following advantages and outstanding effects: the present invention provides a wedge-shaped plug-in type yaw braking device for wind power generators, which not only has a simple structure, requires little operating force, and Reliable, inexpensive, and easy to implement "fail-safe" designs.

Description of drawings

Figures 1a and 1b are the structural schematic diagrams of the wedge block and the radial insertion of the wedge block into the yaw gear, respectively.

Fig. 2 is a schematic structural diagram of a yaw slewing bearing mechanism with an external yaw gear.

Fig. 3 is a structural schematic diagram of an embodiment of a wedge-shaped plug-in braking device when the slewing support mechanism with an external yaw gear is used.

Fig. 4 is a structural schematic diagram of another embodiment of the wedge-shaped plug-in braking device when the external yaw gear slewing support mechanism is adopted.

Fig. 5 is a structural schematic diagram of an embodiment of the wedge-shaped plug-in braking device when the device includes a chainring fixed to the yaw gear and the tower. A plurality of wedge blocks matched with the chainring and a driving device for driving the wedge blocks are installed on the base of the nacelle. Shown is the radial insertion of the wedges.

In the figure: 1-outer yaw gear; 2-outer bearing ring of yaw slewing ring; 3-inner bearing ring of yaw slewing ring; 4-cabin base; 5-wedge block driving device; 6-wedge block; 7-teeth plate.

Detailed ways

The specific structure of the present invention will be further described below in conjunction with the accompanying drawings.

The wedge block plug-in type yaw braking device provided by the present invention utilizes a yaw gear and a wedge block to form a plug-in type brake device. For example, the external yaw gear uses externally mounted wedge blocks inserted between the gear teeth to fix the nacelle and tower. For the internal yaw gear, an internally installed wedge block is inserted between the gear teeth to fix the nacelle and the tower. Fig. 2 is a schematic structural diagram of a yaw slewing bearing mechanism with an external yaw gear. It includes an outer yaw gear 1, an outer bearing ring 2 of the yaw slewing ring and an inner bearing ring 3 of the yaw slewing ring.

Fig. 3 is a structural schematic diagram of an embodiment of a wedge-shaped plug-in braking device when the external yaw gear slewing support mechanism is used. The wedge drive 5 is fixed on the rotating nacelle base 4 . The figure shows that the wedge block 6 is inserted radially.

Fig. 4 is a structural schematic diagram of another embodiment of the wedge-shaped plug-in braking device when the external yaw gear slewing support mechanism is adopted. The wedge drive 5 is fixed on the rotating nacelle base 4 . The figure shows the axial insertion of the wedge block 6 .

For the slewing support mechanism of the yaw system using the inner yaw gear, the wedge block plug-in brake device is similar to that of the slewing support mechanism with the outer yaw gear.

At present, the number of teeth of the external yaw gear of a certain 1.5MW wind turbine widely used in China is 164, which means that the yaw control accuracy is 360/164≈2.2°. If you think the accuracy is low, you can use the device shown in Figure 5:

Fig. 5 is a structural schematic diagram of an embodiment of a wedge-shaped plug-in braking device when the device includes a chainring 7 fixed to the yaw gear and the tower. On the nacelle base 4, a plurality of wedge blocks 6 matched with the toothed disc 7 and a driving device 5 for driving the wedge blocks are installed. Shown is the radial insertion of the wedges. The number of teeth of the chainring can be determined according to the requirement of yaw accuracy.

Wedge drive can be hydraulic or solenoid actuated, hydraulic or solenoid energized, spring return, or a "fail safe" design, spring pressed in, hydraulic or solenoid energized return.

The wedges described in the present invention are single-tapered wedges, double-tapered wedges, or wedges with cylindrical tops.

After calculating the torque required for yaw braking in detail, since the size of the wedge is determined by the size between teeth of the gear, the rest is to determine the number of wedges. Wedge blocks can generally be arranged to be evenly distributed on the circumference. If there are contradictions in the structure, it can also be unevenly distributed.

Yaw Accuracy and Operating Instructions

When the wedge-shaped plug-in brake device is used, according to the existing external yaw gear of a certain 1.5MW wind turbine, it has 164 teeth, which means that the yaw control accuracy is 360/164≈2.2°, and the general error is between Between 0° and 1.1°, in principle, the yaw requirement can be met. If the structure described in Figure 5 is adopted, the yaw accuracy can be greatly improved.

In order to make the yaw brake wedges align more accurately between the teeth for insertion, the control system can be considered to precisely control the yaw angle, and at the same time position sensors are installed at the corresponding positions of each brake to judge the wedge shape at the end of the yaw. Whether the block has been inserted to ensure the safe and reliable operation of the unit.

Claims (6)

1. Wedge block inserted type off course brake of wind electricity generator, contain Slewing Support Mechanism, engine room foundation and the pylon of out yawing gear, it is characterized in that: the drive unit (5) of on engine room foundation, several wedge-shaped blockss (6) that match with the out yawing gear being installed and being used to drive this wedge-shaped blocks.

2. Wedge block inserted type off course brake of wind electricity generator, Slewing Support Mechanism, engine room foundation and the pylon of yaw gear in containing is characterized in that: the drive unit (5) of several wedge-shaped blockss (6) that match with interior yaw gear being installed and being used to drive this wedge-shaped blocks on engine room foundation.

3. Wedge block inserted type off course brake of wind electricity generator, the Slewing Support Mechanism, engine room foundation, pylon and the brake disc that contain interior or out yawing gear, it is characterized in that: on brake disc inner ring or outer ring, make a circle profile of tooth, the drive unit (5) of on engine room foundation, several wedge-shaped blockss (6) that match with this profile of tooth being installed and being used to drive this wedge-shaped blocks.

4. Wedge block inserted type off course brake of wind electricity generator, the Slewing Support Mechanism, engine room foundation, the pylon that contain interior or out yawing gear, it is characterized in that: this device comprises a fluted disc of fixing with described yaw gear and pylon, the drive unit (5) of several wedge-shaped blockss (6) that match with this fluted disc being installed and being used to drive this wedge-shaped blocks on engine room foundation.

5. according to claim 1,2,3 or 4 described Wedge block inserted type off course brake of wind electricity generator, it is characterized in that: described drive unit adopts hydraulic pressure or electromagnetic coil drive unit.

6. according to the described Wedge block inserted type off course brake of wind electricity generator of claim 5, it is characterized in that: described wedge-shaped blocks is that single tapering wedge-shaped blocks, double tapered wedge-shaped blocks or top are the wedge-shaped blocks of cylndrical surface.

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