Wind turbine yaw brake system and wind turbine generator system

Abstract

The present application relates to the field of wind power generation technology, and more particularly to a wind turbine yaw brake system and a wind turbine. The wind turbine yaw brake system comprises a tower, a yaw flange, a nacelle, a yaw bearing, a yaw drive unit, a first brake assembly and a second brake assembly. The nacelle is rotatably connected to the yaw flange through the yaw bearing. The yaw drive is connected to the yaw flange or the nacelle, and the yaw drive unit is configured to drive the nacelle to rotate relative to the tower. The first brake assembly is connected to the yaw flange and configured to provide yaw damping when the yaw drive unit drives the nacelle to rotate relative to the tower. The second brake assembly is connected to the nacelle and configured to limit the rotation of the nacelle when the nacelle is stationary relative to the yaw flange. The wind turbine yaw brake system can achieve greater braking force, improve stability during yawing and in the stationary state, reduce wear during use of the system, and prolong the service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation, in particular to a wind turbine yaw brake system and a wind turbine. BACKGROUND

[0002] The function of the wind turbine yaw transmission system is to realize the wind-ward head and keep the head static during non-yawing. At present, the conventional wind turbine yaw transmission system includes a yaw drive system and a brake system. The outer side of the brake disc is connected with the tower top flange, and the inner side end surface thereof is used as a brake disc friction surface to realize the layout and work of the yaw transmission system. The brake disc is braked by a caliper brake. During yawing, the brake has a certain residual pressure. When the machine stops, the yaw brake is high-pressure braked to keep the head static. However, such a setting mode needs a larger space to arrange the brake to realize sufficient braking, thereby increasing the diameter of the designed yaw system and increasing the design cost of the yaw system. SUMMARY

[0003] The present application relates to the field of wind power generation, in particular to a wind turbine yaw brake system and a wind turbine.

[0004] Embodiments of the present application can be implemented as follows:

[0005] In a first aspect, the present application provides a wind turbine yaw brake system, which includes a tower, a yaw flange, a nacelle, a yaw bearing, a yaw drive unit, a first brake assembly and a second brake assembly.

[0006] The yaw flange is connected with the tower, the nacelle is rotatably connected with the yaw flange through the yaw bearing, the yaw drive is connected with the yaw flange or the nacelle, and the yaw drive unit is used to drive the nacelle to rotate relative to the tower.

[0007] The first brake assembly is connected with the yaw flange and is used to provide yaw damping when the nacelle is driven to rotate relative to the tower by the yaw drive unit.

[0008] The second brake assembly is connected with the nacelle and is used to limit the rotation of the nacelle when the nacelle is static relative to the yaw flange.

[0009] In an optional embodiment, the first brake assembly includes a plurality of single-column brakes, and the plurality of single-column brakes are arranged around the rotation axis of the nacelle.

[0010] The plurality of single-column brakes are connected with the yaw flange, and are used to abut against the lower end surface of the moving ring of the yaw bearing when the yaw driving unit drives the nacelle to rotate relative to the tower, so as to provide yaw damping.

[0011] In an optional embodiment, the second brake assembly comprises a plurality of hydraulic caliper brakes, which are arranged around the rotation axis of the nacelle and located on the side of the plurality of single-column brakes close to the rotation axis of the nacelle; the plurality of hydraulic caliper brakes are used to clamp the yaw flange when the nacelle is stationary relative to the yaw flange, so as to limit the rotation of the nacelle and achieve the nacelle stationary.

[0012] In an optional embodiment, the yaw flange is provided with a plurality of chip removal holes penetrating in the vertical direction, which are arranged around the rotation axis of the nacelle.

[0013] In an optional embodiment, the yaw flange is provided with a chip stopping table, which is arranged around the rotation axis of the nacelle and located on the outer periphery of the plurality of hydraulic caliper brakes, and the chip stopping table is located on the side of the chip removal hole close to the rotation axis of the nacelle.

[0014] In an optional embodiment, the chip removal hole is located on the side of the single-column brake close to the rotation axis of the nacelle.

[0015] In an optional embodiment, the yaw driving unit is connected with the nacelle and transmission connected with the static ring of the yaw bearing.

[0016] Alternatively, the yaw driving unit is connected with the yaw flange and transmission connected with the moving ring of the yaw bearing.

[0017] In a second aspect, the present application provides a wind turbine generator, which comprises the wind turbine generator yaw brake system.

[0018] The beneficial effects of the embodiments of the present application include:

[0019] The wind turbine generator yaw brake system comprises a tower, a yaw flange, a nacelle, a yaw bearing, a yaw driving unit, a first brake assembly and a second brake assembly; the yaw flange is connected with the tower, the nacelle is rotatably connected with the yaw flange through the yaw bearing, the yaw driving unit is connected with the yaw flange or the nacelle, and the yaw driving unit is used to drive the nacelle to rotate relative to the tower; the first brake assembly is connected with the yaw flange and used to provide yaw damping when the yaw driving unit drives the nacelle to rotate relative to the tower; the second brake assembly is connected with the nacelle and used to limit the rotation of the nacelle and achieve the nacelle stationary when the nacelle is stationary relative to the yaw flange.

[0020] The first brake assembly is provided with a single compression column brake, and the single compression column brake and the lower end surface of the moving ring of the bearing are combined to form a brake system. The abrasion powder generated by the first brake assembly during yawing naturally falls off and does not remain on the brake surface, so that the abrasion powder and oil stains are discharged in time, which has important significance: a. The abrasion of the friction plate of the brake is greatly reduced, the service life of the friction plate is improved, and the noise problem of the yawing process caused by the oil stains and abrasion powder is effectively avoided; b. The friction surface of the brake is effectively prevented from being polluted, the stability of the friction coefficient is ensured, the stable braking force is realized, and the stable operation of the yawing system of the wind turbine generator is effectively ensured.

[0021] The first brake assembly is provided with a single compression column brake, and the single compression column brake and the lower end surface of the moving ring of the bearing are combined to form a brake system. The abrasion powder generated by the first brake assembly during yawing naturally falls off and does not remain on the brake surface, so that the abrasion powder and oil stains are discharged in time, which has important significance: a. The abrasion of the friction plate of the brake is greatly reduced, the service life of the friction plate is improved, and the noise problem of the yawing process caused by the oil stains and abrasion powder is effectively avoided; b. The friction surface of the brake is effectively prevented from being polluted, the stability of the friction coefficient is ensured, the stable braking force is realized, and the stable operation of the yawing system of the wind turbine generator is effectively ensured.

[0022] The wind turbine yaw brake system can arrange more brakes in limited space, so that greater braking force is realized, the cost of the yaw system of the large-megawatt wind turbine generator is greatly reduced, and the stability during yawing and in the stationary state is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0024] Figure 1 The figure is a structural schematic diagram of the wind turbine yaw brake system in the embodiment of the present application.

[0025] Figure 2 The figure is a structural schematic diagram of the yaw flange in the embodiment of the present application.

[0026] Figure 3 The figure is a structural schematic diagram of the transmission connection between the yaw driving unit and the moving ring in other embodiments of the present application.

[0027] Figure 4 The figure is a structural schematic diagram of the connection between the yaw driving unit and the yaw flange in other embodiments of the present application.

[0028] Icon: 200 - wind turbine yaw brake system; 210 - tower; 220 - yaw flange; 230 - nacelle; 240 - yaw bearing; 250 - yaw drive unit; 260 - first brake assembly; 270 - second brake assembly; 261 - single-post brake; 241 - moving ring; 242 - stationary ring; 271 - hydraulic caliper brake; 221 - chip removal hole; 222 - chip removal platform. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0035] Please refer to Figure 1 and Figure 2The embodiment provides a wind turbine yaw brake system 200, the wind turbine yaw brake system 200 comprising a tower 210, a yaw flange 220, a nacelle 230, a yaw bearing 240, a yaw drive unit 250, a first brake assembly 260 and a second brake assembly 270;

[0036] The yaw flange 220 is connected with the tower 210, the nacelle 230 is rotatably connected with the yaw flange 220 through the yaw bearing 240, the yaw drive is connected with the yaw flange 220 or the nacelle 230, and the yaw drive unit 250 is used for driving the nacelle 230 to rotate relative to the yaw flange 220;

[0037] The first brake assembly 260 is connected with the yaw flange 220, and is used for providing yaw damping when the yaw drive unit 250 drives the nacelle 230 to rotate relative to the yaw flange 220;

[0038] The second brake assembly 270 is connected with the nacelle 230, and is used for limiting rotation of the nacelle 230 when the nacelle 230 is static relative to the yaw flange 220.

[0039] Please refer to Figure 1 and Figure 2 The wind turbine yaw brake system 200 comprises a tower 210, a yaw flange 220, a nacelle 230, a yaw bearing 240, a yaw drive unit 250, a first brake assembly 260 and a second brake assembly 270;

[0040] The yaw flange 220 is connected with the tower 210, the nacelle 230 is rotatably connected with the yaw flange 220 through the yaw bearing 240, the yaw drive is connected with the yaw flange 220 or the nacelle 230, and the yaw drive unit 250 is used for driving the nacelle 230 to rotate relative to the yaw flange 220; in the working process, the nacelle 230 has a yaw state of rotation relative to the yaw flange 220 and a state of being static relative to the yaw flange 220;

[0041] The first brake assembly 260 is connected with the yaw flange 220, and is used for providing yaw damping when the yaw drive unit 250 drives the nacelle 230 to rotate relative to the yaw flange 220; the second brake assembly 270 is connected with the nacelle 230, and is used for limiting rotation of the nacelle 230 when the nacelle 230 is static relative to the yaw flange 220, so that the nacelle 230 remains static.

[0042] Therefore, the wind turbine yaw brake system 200 is capable of arranging more brakes in limited space by optimizing the internal structure of the wind turbine yaw brake system 200 to set the first brake assembly 260 and the second brake assembly 270. Moreover, when the first brake assembly 260 and the second brake assembly 270 are set, the first brake assembly 260 is used to provide yaw damping in the yaw state, so as to maintain the stability of the nacelle 230 in the yaw process and prevent yaw failure caused by wind interference; when the nacelle 230 is in a static state, the second brake assembly 270 limits the rotation of the nacelle 230, so as to maintain the stability of the nacelle 230 in the static state.

[0043] Furthermore, the wind turbine yaw brake system 200 is capable of achieving greater braking force, improving the stability in the yaw process and the static state, reducing the wear of the system during use, and prolonging the service life by the above structure.

[0044] Further, please refer to Figure 1 and Figure 2 Based on the above structure, in the present embodiment, when the first brake assembly 260 is set, the first brake assembly 260 includes a plurality of single-column brakes 261, and the plurality of single-column brakes 261 are arranged around the rotation axis of the nacelle 230. The plurality of single-column brakes 261 are connected with the yaw flange 220, and the plurality of single-column brakes 261 are used to abut against the lower end surface of the moving ring 241 of the yaw bearing 240 when the yaw driving unit 250 drives the nacelle 230 to rotate relative to the yaw flange 220, so as to provide yaw damping.

[0045] It should be noted that, in the present embodiment, since the nacelle 230 is rotatably connected with the yaw flange 220 through the yaw bearing 240, and the yaw bearing 240 includes a bearing inner ring and a bearing outer ring, in the present embodiment, the bearing inner ring or the bearing outer ring connected with the nacelle 230 is regarded as a moving ring, and the bearing inner ring or the bearing outer ring connected with the yaw flange 220 is regarded as a static ring.

[0046] When the second brake assembly 270 is set, the second brake assembly 270 includes a plurality of hydraulic caliper brake 271, and the plurality of hydraulic caliper brake 271 are arranged around the rotation axis of the nacelle 230 and located on the side of the plurality of single-column brakes 261 close to the rotation axis of the nacelle 230. The plurality of hydraulic caliper brake 271 are used to clamp the yaw flange 220 when the nacelle 230 is static relative to the yaw flange 220, so as to limit the rotation of the nacelle 230 and achieve the static state of the nacelle 230.

[0047] Thus, through the foregoing structural arrangement, yaw damping can be provided by the plurality of single-column brakes 261 in the yaw state, i.e., yaw braking is achieved, so that the stability of the nacelle 230 during yawing is not disturbed by the wind to cause yaw failure; and the rotation of the nacelle 230 is limited by the plurality of hydraulic caliper brakes 271 when the nacelle 230 is in a stationary state, so that the stability of the nacelle 230 in the stationary state is maintained; thus, the yaw braking system 200 of the wind turbine can be greatly reduced in cost, the service life of the hydraulic caliper brakes 271 can be greatly improved, the wear of the hydraulic caliper brakes 271 can be reduced, and the service life of the yaw flange 220 subjected to yaw braking by the hydraulic caliper brakes 271 can be improved.

[0048] It should be noted that in the prior art, the structural layout of the yaw braking system has natural deficiencies, such as difficulty in discharging wear debris, yaw noise, and abnormal wear of the yaw brake disc.

[0049] Based on the above reasons, please refer to Figure 1 and Figure 2 In the present embodiment, when the first braking assembly 260 is a plurality of single-column brakes 261, the plurality of single-column brakes 261 are connected with the yaw flange 220 and are used to abut against the lower end surface of the moving ring 241 of the yaw bearing 240 when the yaw driving unit 250 drives the nacelle 230 to rotate relative to the yaw flange 220, so as to provide yaw damping.

[0050] Through such a setting mode, the single-column brakes 261 can abut against the lower end surface of the moving ring 241 to brake during the yaw braking process, so as to reduce the wear of the hydraulic caliper brakes 271; at the same time, since the single-column brakes 261 abut against the lower end surface of the moving ring 241, the wear debris generated during the braking process of the single-column brakes 261 will automatically fall to the yaw flange 220 due to gravity, so as to be timely and effectively discharged, thereby avoiding the problems of early excessive wear and failure of the brake friction plate, large yaw noise, and large vibration caused by the wear debris and oil stains remaining on the braking surface of the first braking system of the wind turbine.

[0051] Since wear debris is generated during the braking process of the single-column brakes 261 abutting against the lower end surface of the moving ring 241, the wear debris will fall to the yaw flange 220 due to gravity, and in order to avoid accumulation on the yaw flange 220, in the present embodiment, the yaw flange 220 is provided with a plurality of chip removal holes 221 penetrating in the vertical direction, and the plurality of chip removal holes 221 are arranged around the rotation axis of the nacelle 230, so as to automatically discharge the wear debris and oil stains generated during the braking process of the single-column brakes 261.

[0052] By the above-mentioned single-column brake 261, the hydraulic caliper brake 271 of the yaw brake system 200 is always in braking during the yaw braking process, thereby avoiding the generation of abrasion, and the hydraulic caliper brake 271 is always worn under low pressure;

[0053] Moreover, in order to avoid the abrasion and oil stains affecting the normal work of other structures, such as the hydraulic caliper brake 271, the yaw flange 220 is provided with a debris blocking table 222, which is arranged on the outer periphery of the plurality of hydraulic caliper brakes 271 around the rotation axis of the nacelle 230, and the debris blocking table 222 is located on the side of the debris hole 221 close to the rotation axis of the nacelle 230, and the debris hole 221 is located on the side of the single-column brake 261 close to the rotation axis of the nacelle 230. By such an arrangement, the abrasion and oil stains can be blocked by the debris blocking table 222, so as to limit the entry of the abrasion and oil stains into the second brake assembly 270, thereby ensuring the braking stability of the second brake assembly 270. Thus, the yaw brake system 200 of the wind turbine can avoid the situation that the braking torque is attenuated and the yaw stability is poor under the combined action of the abrasion and oil stains.

[0054] It should be noted that, by the above-mentioned debris hole 221 and debris blocking table 222, the abrasion and oil stains can be effectively discharged, and the hydraulic caliper brake 271 can be physically isolated from the single-column brake 261, thereby avoiding the influence of the abrasion and oil stains on the hydraulic caliper brake 271.

[0055] In summary, referring to Figure 1 and Figure 2 , the yaw brake system 200 of the wind turbine adopts the combination of the first brake assembly 260 and the second brake assembly 270, and the first brake assembly 260 is arranged as a plurality of single-column brakes 261. By the arrangement that the single-column brake 261 is in abutment with the lower end surface of the moving ring 241 for braking, the abrasion caused by the yaw under pressure can naturally fall by gravity and will not remain on the braking surface, thereby greatly reducing the wear of the friction plate of the brake, improving the service life of the friction plate, and effectively reducing the yaw noise problem. At the same time, the yaw brake system 200 of the wind turbine can realize the timely discharge of the oil stains and abrasion of the yaw, effectively ensure that the friction coefficient of the brake is not contaminated, achieve the effect of stable braking force, and effectively ensure the stable operation of the yaw brake system 200 of the wind turbine.

[0056] Based on the foregoing structure, referring to Figure 1 and Figure 2 , in the embodiment, the yaw driving unit 250 is connected with the nacelle 230, and the yaw driving unit 250 is located on the outer side of the yaw bearing 240, and is in transmission connection with the static ring 242. At this time, the bearing outer ring of the yaw bearing 240 is the static ring, and the bearing inner ring is the moving ring.

[0057] Please refer to Figure 3 In other embodiments of the present application, when connected with the nacelle 230, the yaw drive unit 250 can also be arranged inside the yaw bearing 240 and connected in transmission with the static ring 242, in which case the bearing outer ring of the yaw bearing 240 is a dynamic ring and the bearing inner ring is a static ring.

[0058] Please refer to Figure 4 In other embodiments of the present application, the yaw drive unit 250 can also be connected with the yaw flange 220, i.e. with the tower 210, and arranged inside the yaw bearing 240 and connected in transmission with the dynamic ring 241 of the yaw bearing 240, in which case the bearing outer ring of the yaw bearing 240 is a static ring and the bearing inner ring is a dynamic ring.

[0059] It should be noted that from the above, when arranging the yaw drive unit 250, it can be arranged inside or outside the yaw bearing 240 under the premise of meeting the layout requirements and improving the space utilization, and it can also be connected with the nacelle 230 or the yaw flange 220.

[0060] Please refer to Figures 1-4 Based on the above wind turbine yaw brake system 200, the present application further provides a wind turbine, which comprises the above wind turbine yaw brake system 200.

[0061] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A yaw braking system for a wind turbine generator, characterized in that: The wind turbine yaw braking system includes a tower, yaw flange, nacelle, yaw bearing, yaw drive unit, first braking assembly, and second braking assembly. The yaw flange is connected to the tower, the nacelle is rotatably connected to the yaw flange via the yaw bearing, the yaw drive is connected to the yaw flange or the nacelle, and the yaw drive unit is used to drive the nacelle to rotate relative to the tower. The first braking assembly is connected to the yaw flange and is used to provide yaw damping when the yaw drive unit drives the nacelle to rotate relative to the tower. The second braking assembly is connected to the nacelle and is used to limit the rotation of the nacelle when the nacelle is stationary relative to the yaw flange; The first braking assembly includes multiple single-column brakes, all of which are arranged around the rotation axis of the cabin. Multiple single-column brakes are connected to the yaw flange, and the multiple single-column brakes are used to contact the lower end face of the moving ring of the yaw bearing when the yaw drive unit drives the nacelle to rotate relative to the tower, so as to provide yaw damping.

2. The wind turbine yaw braking system according to claim 1, characterized in that: The second braking assembly includes multiple hydraulic caliper brakes, all of which are arranged around the rotation axis of the nacelle and located on the side of the multiple single-column brakes close to the rotation axis of the nacelle; the multiple hydraulic caliper brakes are used to clamp the yaw flange when the nacelle is stationary relative to the yaw flange, so as to limit the rotation of the nacelle and achieve nacelle stationary.

3. The wind turbine yaw braking system according to claim 2, characterized in that: The yaw flange has multiple chip removal holes that extend vertically, and these multiple chip removal holes are arranged around the rotation axis of the engine compartment.

4. The wind turbine yaw braking system according to claim 3, characterized in that: The yaw flange is provided with a chip baffle, which is located around the rotation axis of the engine compartment on the outer periphery of the plurality of hydraulic clamp brakes, and the chip baffle is located on the side of the chip discharge hole close to the rotation axis of the engine compartment.

5. The wind turbine yaw braking system according to claim 3, characterized in that: The chip removal hole is located on the side of the single-column brake near the rotation axis of the nacelle.

6. The wind turbine yaw braking system according to any one of claims 1-5, characterized in that: The yaw drive unit is connected to the nacelle and is also connected to the stationary ring drive of the yaw bearing. Alternatively, the yaw drive unit is connected to the yaw flange and is also connected to the moving coil of the yaw bearing via a drive mechanism.

7. A wind turbine generator set, characterized in that: The wind turbine generator set includes the wind turbine generator set yaw braking system as described in any one of claims 1-6.

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