A yaw brake mechanism for a wind turbine

Abstract

The utility model relates to the technical field of wind turbine generator unit, in particular to a kind of yaw brake mechanism of wind turbine generator unit, comprising: pedestal, independently fixedly arranged in the interior of tower body;Brake disc, coaxially installed on rotating main shaft, yaw gear ring is coaxially installed on brake disc outer wall, and brake disc is provided with multiple groups of corrugated structure's heat dissipation holes in axial direction, and the radial section of heat dissipation hole is S type airflow passage;Hydraulic brake unit is installed on pedestal by support mechanism, two friction plate assemblies are arranged on hydraulic brake unit, and brake disc is located in the middle of two friction plate assemblies;It improves brake efficiency, and increases brake stability.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine generators, and in particular to a yaw braking mechanism for wind turbine generators. Background Technology

[0002] With the continuous advancement of wind power generation technology, the operational stability and safety of wind turbines in complex natural environments have become key concerns in design and operation and maintenance. As the core functional module for wind turbines to automatically align with the wind and adjust the angle of attack, the reliability of the yaw system's braking mechanism directly affects the unit's operating efficiency and safety performance. The yaw braking mechanism plays a crucial role in wind turbines by quickly locking the nacelle position after yaw action and preventing unintended yaw caused by wind loads. Especially under extreme conditions such as strong winds and gusts, higher requirements are placed on braking response speed, braking torque stability, and heat dissipation capacity.

[0003] Currently, most common yaw braking mechanisms in wind turbines employ hydraulic braking, using friction pad assemblies to clamp the brake disc and achieve braking. While this type of structure can meet basic braking requirements to some extent, it still has many shortcomings in practical applications. For example, traditional brake disc structures have limited heat dissipation capacity; prolonged or frequent braking can easily lead to increased brake disc temperature, causing a decline in the performance of friction materials, reduced braking efficiency, and even thermal deformation, thus affecting braking stability. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a yaw braking mechanism for wind turbine generators.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model discloses a yaw braking mechanism for a wind turbine, comprising:

[0007] The base is independently and fixedly installed inside the tower body;

[0008] The brake disc is coaxially mounted on the rotating main shaft. A yaw gear ring is coaxially mounted on the outer wall of the brake disc. The brake disc has multiple sets of wave-shaped heat dissipation holes in its axial direction. The heat dissipation holes have an S-shaped airflow channel along the radial cross section.

[0009] The hydraulic braking unit is mounted on the base via a support mechanism. The hydraulic braking unit is equipped with two friction pad assemblies, and the brake disc is located in the middle of the two friction pad assemblies.

[0010] Furthermore, the hydraulic braking unit includes at least three brake slave cylinders evenly distributed along the circumference, and each brake slave cylinder is connected in parallel through hydraulic lines.

[0011] Furthermore, each brake caliper piston is equipped with a pressure sensor.

[0012] Furthermore, the support mechanism corresponds one-to-one with multiple brake calipers, and the support mechanism includes:

[0013] The guide rail is mounted on the base, and its length direction is parallel to the main shaft;

[0014] Two movable parts are symmetrically slidably mounted on the guide rail, and two friction pad assemblies are respectively mounted on the two movable parts;

[0015] The brake caliper is mounted on a moving part, and the output end of the brake caliper is connected to another moving part.

[0016] Furthermore, a return spring is provided on the moving part, and the other end of the return spring is mounted on the guide rail.

[0017] Furthermore, the friction pad assembly includes:

[0018] The main friction plate is connected to the moving part via a spring pin.

[0019] The auxiliary friction pad is attached to the surface of the main friction pad via a temperature memory alloy pad.

[0020] Furthermore, the temperature memory alloy gasket deforms at a specified temperature, increasing the gap between the friction end face of the auxiliary friction pad and the friction end face of the main friction pad, reducing the pressure on the brake disc and avoiding overheating damage.

[0021] Furthermore, the brake disc surface is provided with an annular groove, and the groove is provided with a wear indicator line, which is made of a metal material different from that of the brake disc.

[0022] In the above technical solution, the yaw braking mechanism for wind turbine generators provided by this utility model has the following beneficial effects:

[0023] The base serves as a fundamental support structure, providing a stable mounting foundation for all components and ensuring structural stability during braking. Multiple sets of wavy heat dissipation holes and S-shaped airflow channels along the brake disc's axis efficiently guide airflow during braking, quickly dissipating heat generated by friction and preventing performance degradation due to high temperatures. The hydraulic braking unit is mounted on the base via a support mechanism, with its two friction pad assemblies symmetrically clamping the brake disc to apply braking force evenly, preventing uneven force distribution and deformation of the brake disc, thus improving braking stability and reliability. The yaw gear ring engages with the drive gear of the yaw drive system, enabling coordinated braking and yaw drive operations to ensure precise adjustment of the wind turbine's angle of attack. The overall structure features rapid braking response and excellent heat dissipation, effectively withstanding the impact and friction during yaw braking, extending the service life of the braking mechanism, and ensuring the safe operation of the wind turbine under complex conditions. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0025] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the axonal structure of this utility model;

[0027] Figure 3 This is a cross-sectional structural diagram of the brake disc of this utility model;

[0028] Figure 4 This is an exploded structural diagram of the support mechanism of this utility model;

[0029] Figure 5 This is an exploded structural diagram of the friction plate assembly of this utility model;

[0030] The following are labels in the attached diagram: 1. Base; 2. Brake disc; 3. Yaw ring gear; 4. Wear indicator line; 5. Hydraulic braking unit; 51. Brake caliper; 52. Pressure sensor; 6. Support mechanism; 61. Guide rail; 62. Moving part; 63. Return spring; 7. Friction pad assembly; 71. Main friction pad; 72. Spring pin; 73. Auxiliary friction pad; 74. Temperature memory alloy gasket. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0032] like Figures 1 to 5 As shown;

[0033] A yaw braking mechanism for a wind turbine generator according to an embodiment of this utility model includes:

[0034] Base 1 is the basic support structure of the entire yaw braking mechanism, and it is independently and fixedly installed inside the tower body;

[0035] Brake disc 2 is coaxially mounted on the rotating main shaft and serves as the core actuator for yaw braking. A yaw gear ring 3 is coaxially mounted on the outer wall of brake disc 2 for cooperating with the drive gear of the yaw drive system. Brake disc 2 has multiple sets of wave-shaped heat dissipation holes in its axial direction. The heat dissipation holes have an S-shaped airflow channel along the radial section to effectively guide airflow.

[0036] The hydraulic braking unit 5 is the core power component for realizing yaw braking. It is installed on the base 1 through the support mechanism 6. The hydraulic braking unit 5 is equipped with two friction pad assemblies 7, and the brake disc 2 is located in the middle of the two friction pad assemblies 7. The brake disc 2 is symmetrically clamped to realize braking.

[0037] By adopting the above technical solutions, the base 1 serves as a basic support structure, providing a stable installation foundation for each component and ensuring structural stability during braking. The multiple sets of wavy heat dissipation holes and S-shaped airflow channels in the axial direction of the brake disc 2 can efficiently guide airflow during braking, quickly dissipate the heat generated by friction, and avoid the decrease in braking performance due to high temperature. The hydraulic braking unit 5 is installed on the base 1 through the support mechanism 6, and its two friction pad assemblies 7 symmetrically clamp the brake disc 2, which can apply braking force evenly, prevent the brake disc 2 from deforming due to uneven force, and improve braking stability and reliability. The yaw gear ring 3 cooperates with the active gear of the yaw drive system, so that braking and yaw drive work together to ensure that the wind turbine can accurately adjust the windward angle. The overall structure has a rapid braking response and excellent heat dissipation performance, which can effectively withstand the impact and friction during yaw braking, extend the service life of the braking mechanism, and ensure the operational safety of the wind turbine under complex working conditions.

[0038] As a preferred embodiment of the above technical solution, such as Figures 1 to 5 As shown, the hydraulic braking unit 5 includes at least three brake calipers 51 evenly distributed along the circumference, and each brake caliper 51 is connected in parallel through hydraulic lines.

[0039] Each brake caliper 51 has a pressure sensor 52 at the piston end;

[0040] In this embodiment, multiple brake calipers 51 are evenly distributed along the circumference and, in conjunction with parallel hydraulic lines, can apply balanced braking force to the friction pad assembly 7, ensuring consistent force on all parts of the brake disc 2, avoiding localized wear or brake misalignment, and improving braking stability. The pressure sensor 52 at the piston end of each brake caliper 51 can monitor the piston output pressure in real time, facilitating timely detection of pressure anomalies, ensuring synchronized operation of each caliper, and preventing brake force imbalance due to a single caliper failure. It also provides data support for the debugging and maintenance of the braking system. This structure improves braking reliability through the coordinated operation of multiple calipers, achieves intelligent monitoring with pressure sensing, extends the service life of the brake disc 2 and friction pad assembly 7, and ensures the safety and accuracy of yaw braking of the wind turbine.

[0041] As a preferred embodiment of the above technical solution, such as Figures 1 to 5 As shown, the support mechanism 6 corresponds one-to-one with multiple brake calipers 51. The support mechanism 6 includes:

[0042] Guide rail 61 is mounted on base 1, and the length direction of guide rail 61 is parallel to the main shaft.

[0043] Two movable parts 62 are symmetrically slidably mounted on the guide rail 61, and two friction pad assemblies 7 are respectively mounted on the two movable parts 62;

[0044] Brake caliper 51 is mounted on a movable part 62, and the output end of brake caliper 51 is connected to another movable part 62.

[0045] A reset spring 63 is provided on the movable part 62, and the other end of the reset spring 63 is mounted on the guide rail 61.

[0046] In this embodiment, the guide rail 61 is parallel to the main shaft in its length direction, ensuring that the two moving parts 62 drive the friction pad assembly 7 to slide symmetrically along the axial direction, accurately clamping the brake disc 2 and avoiding uneven braking caused by the friction pad assembly 7 shifting. The brake caliper 51 is mounted on one moving part 62 and its output end is connected to the other moving part 62, which can drive the two moving parts 62 to move closer or further away synchronously, realizing the stable clamping and releasing of the friction pad assembly 7 on the brake disc 2. The hydraulic power of the brake caliper 51 improves the braking response speed. The return spring 63 on the moving part 62 is connected to the guide rail 61, which can drive the moving part 62 and the friction pad assembly 7 to quickly return to their original positions when the brake is released, avoiding the friction pad assembly 7 from continuous contact with the brake disc 2 and causing additional wear, extending the service life of the friction pad assembly 7 and the brake disc 2, and ensuring the smoothness and reliability of the yaw braking action.

[0047] As a preferred embodiment of the above technical solution, such as Figures 2 to 5 As shown, the friction pad assembly 7 includes:

[0048] The main friction plate 71 is connected to the moving part 62 via a spring pin 72.

[0049] The auxiliary friction plate 73 is attached to the surface of the main friction plate 71 via a temperature memory alloy pad 74;

[0050] The temperature memory alloy gasket 74 deforms at a specified temperature, which increases the gap between the friction end face of the auxiliary friction plate 73 and the friction end face of the main friction plate 71, reduces the pressure on the brake disc 2, and avoids overheating damage.

[0051] In this embodiment, at room temperature, the temperature memory alloy gasket 74 maintains its original thickness, allowing the auxiliary friction pad 73 and the main friction pad 71 to fit tightly together. Combined with the elastic support of the spring pin 72, they press together to compress the brake disc 2, increasing the frictional contact area and braking force, thus improving braking performance. At high temperatures, the temperature memory alloy gasket 74 undergoes a shape memory effect, shrinking axially to create a gap between the auxiliary friction pad 73 and the main friction pad 71. This reduces the pressure on the brake disc 2, preventing damage to the brake disc 2 and friction pads due to excessively high temperatures caused by continuous high-intensity friction, thus achieving automatic overheat protection. The spring pin 72 can buffer the impact force during braking, reducing rigid contact wear between the main friction pad 71 and the moving part 62. This structure balances efficient braking and overheat protection, extending the service life of the friction pad assembly 7 and the brake disc 2, and ensuring the safety and durability of the wind turbine's yaw braking.

[0052] As a preferred embodiment of the above technical solution, such as Figures 1 to 3 As shown, the surface of the brake disc 2 is provided with an annular groove, and the groove is provided with a wear indicator line 4. The wear indicator line 4 is made of a metal material that is different from the material of the brake disc 2.

[0053] In this embodiment, the wear indicator line 4 in the annular groove on the surface of the brake disc 2 is made of a metal material different from that of the brake disc 2. It can intuitively display the wear degree of the brake disc 2. When the surface of the brake disc 2 is worn down to the annular groove due to long-term friction, the wear indicator line 4 will be exposed. By visual comparison, it can be quickly determined whether the brake disc 2 has reached the replacement threshold. No professional testing tools are required, simplifying the maintenance and inspection process. The design of different materials makes the wear rate of the wear indicator line 4 different from that of the brake disc 2, further improving the accuracy of wear judgment, avoiding the decline in braking performance due to excessive wear of the brake disc 2, and ensuring the safe operation of the yaw braking mechanism.

[0054] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A yaw braking mechanism for a wind turbine generator, characterized in that, include: The base (1) is independently and fixedly installed inside the tower body; Brake disc (2) is coaxially mounted on rotating main shaft. A yaw gear ring (3) is coaxially mounted on the outer wall of the brake disc (2). The brake disc (2) has multiple sets of wave-shaped heat dissipation holes in its axial direction. The heat dissipation holes are S-shaped airflow channels along the radial cross section. The hydraulic braking unit (5) is mounted on the base (1) via a support mechanism (6). The hydraulic braking unit (5) is provided with two friction pad assemblies (7), and the brake disc (2) is located in the middle of the two friction pad assemblies (7).

2. The wind turbine yaw braking mechanism as described in claim 1, characterized in that, The hydraulic braking unit (5) includes at least three brake pumps (51) evenly distributed along the circumference, and each brake pump (51) is connected in parallel through hydraulic lines.

3. The wind turbine yaw braking mechanism as described in claim 2, characterized in that, Each of the brake caliper (51) has a pressure sensor (52) at the piston end.

4. The wind turbine yaw braking mechanism as described in claim 2, characterized in that, The support mechanism (6) corresponds one-to-one with each of the multiple brake calipers (51), and the support mechanism (6) includes: A guide rail (61) is installed on the base (1), and the length direction of the guide rail (61) is parallel to the main shaft; Two movable parts (62) are symmetrically slidably mounted on the guide rail (61), and two friction pad assemblies (7) are respectively mounted on the two movable parts (62); The brake caliper (51) is mounted on one of the moving parts (62), and the output end of the brake caliper (51) is connected to the other moving part (62).

5. The wind turbine yaw braking mechanism as described in claim 4, characterized in that, The movable part (62) is provided with a return spring (63), and the other end of the return spring (63) is mounted on the guide rail (61).

6. The wind turbine yaw braking mechanism as described in claim 4, characterized in that, The friction pad assembly (7) includes: The main friction plate (71) is connected to the moving part (62) via a spring pin (72). An auxiliary friction pad (73) is attached to the surface of the main friction pad (71) via a temperature memory alloy pad (74).

7. The wind turbine yaw braking mechanism as described in claim 6, characterized in that, The temperature memory alloy pad (74) deforms at a specified temperature, which increases the gap between the friction end face of the auxiliary friction pad (73) and the friction end face of the main friction pad (71), reduces the pressure on the brake disc (2), and avoids overheating damage.

8. The yaw braking mechanism of a wind turbine as described in claim 1, characterized in that, The surface of the brake disc (2) is provided with an annular groove, and the groove is provided with a wear indicator line (4). The wear indicator line (4) is made of a metal material that is different from the material of the brake disc (2).

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