Mechanical brake device for a wind turbine generator system

Abstract

The application relates to the technical field of wind turbine braking, and provides a wind turbine mechanical braking device. The wind turbine mechanical braking device comprises a speed changing mechanism, a first braking mechanism, a second braking mechanism and a driving mechanism, the output end of a driving piece has a first position for triggering the first braking mechanism to start braking a first shaft, a connecting rod has a separation state and a connection state, the output end of the driving piece also has a second position for triggering the second braking mechanism to start braking a second shaft; the second position is arranged close to the driving piece relative to the first position. The wind turbine mechanical braking device provided by the application is characterized in that when the output end of the driving piece is extended, the second position is first reached to drive the second braking mechanism to pre-brake the second shaft, and then the output end is continuously extended to reach the first position to simultaneously drive the first braking mechanism to start braking. Through the cooperative action of the two sets of braking mechanisms, the braking efficiency is improved, smooth braking buffering is provided, and the friction heat is significantly reduced.

Description

Technical Field

[0001] This application relates to the field of wind turbine generator braking technology, and in particular to a mechanical braking device for wind turbine generators. Background Technology

[0002] Wind power generation refers to the process where a wind turbine rotates under the influence of wind, converting the kinetic energy of the wind into the mechanical energy of the turbine shaft. The generator, driven by the turbine shaft, then rotates, converting the mechanical energy into electrical energy. This is an important form of wind energy utilization. The equipment required for wind power generation is called a wind turbine generator set, which can be broadly divided into three parts: the wind turbine, the generator, and the tower. The wind turbine drives the generator through wind power, but the two are not directly connected; a gearbox and a braking device are installed in between. The braking device is the primary mechanical braking method for the wind turbine blades.

[0003] The brakes in wind turbine generator sets are generally caliper-type hydraulic disc brakes. These brakes are typically activated after the wind turbine blades have been pneumatically braked and decelerated to 20% to 40% of their rated speed. They are the final guarantee for braking the wind turbine blades. However, in actual use, the brakes do not have a buffer during braking, which not only results in low braking efficiency but also causes the brake discs to overheat due to friction, leading to thermal deformation and thermal cracks. The brake discs are located inside the tower and are difficult to replace and repair after damage. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this application provides a mechanical braking device for wind turbine generator sets.

[0005] This application provides a mechanical braking device for a wind turbine generator set, comprising: The transmission mechanism includes a first shaft for connection to a generator set and a second shaft for connection to a wind turbine blade, wherein the first shaft and the second shaft are drive-connected. A first braking mechanism is used to brake the first shaft; A second braking mechanism is used to brake the second shaft; A drive mechanism includes a drive member and a connecting rod. The drive member is connected to the first braking mechanism, and the output end of the drive member has a first position that triggers the first braking mechanism to start braking the first shaft. The connecting rod is connected to the drive member and is configured to have a disengaged state that is separated from the second braking mechanism and a connected state that is connected to it. The output end of the drive member also has a second position that drives the connecting rod to switch from the disengaged state to the connected state to trigger the second braking mechanism to start braking the second shaft. The second position is positioned closer to the drive component than the first position.

[0006] Optionally, the first braking mechanism includes a brake disc and a brake pad assembly. The brake disc is sleeved on the first shaft. The driving member is connected to the brake pad assembly and drives the brake pad assembly to move relative to the brake disc to clamp the brake disc and start braking, or to release the brake disc and stop braking.

[0007] Optionally, the brake pad assembly includes a first brake pad and a second brake pad, wherein the first brake pad and the second brake pad are respectively disposed on both sides of the brake disc; The first brake pad is fixedly disposed relative to the first shaft, the second brake pad is slidably disposed relative to the first shaft along the axial direction of the first shaft, and the brake disc is slidably connected to the first shaft along the axial direction of the first shaft. The driving member is connected to the second brake pad, and the driving member drives the second brake pad to move the brake disc toward the first brake pad to clamp the brake disc.

[0008] Optionally, the second braking mechanism includes a first friction element and a second friction element. The first friction element is sleeved on the second shaft, and the second friction element is sleeved on the outer periphery of the first friction element, and the second friction element and the first friction element are in frictional engagement. The second friction element is provided with a notch, and the connecting rod is provided with a locking block. When the output end of the driving member is in the second position, the locking block is locked in the notch so that the connecting rod is in the connected state, thereby restricting the rotation of the second friction element.

[0009] Optionally, the second braking mechanism further includes a first baffle, which is fixedly mounted on the second shaft and covers the first friction member and at least part of the second friction member. The first baffle is provided with heat dissipation holes. The first friction element includes a first rubber ring, which is fixedly mounted on the second shaft. The second friction element includes a blocking disc and a second rubber ring embedded in the middle of the blocking disc. The second rubber ring and the first rubber ring are in frictional engagement. The edge of the blocking disc has the notch.

[0010] Optionally, the mechanical braking device of the wind turbine generator set further includes a heat dissipation mechanism, which includes a sealing cylinder with a cavity inside. The sealing cylinder has a one-way air inlet and a one-way air outlet communicating with the cavity. The first braking mechanism is provided with an air outlet channel, which is connected to the one-way air outlet. A squeezing member is movably disposed on the sealing cylinder, and a first elastic member is disposed between the squeezing member and the sealing cylinder. The squeezing member is configured to have a squeezing state in which it moves toward the cavity to squeeze the air in the cavity and discharge it through the one-way air outlet, and a return state in which it moves away from the cavity, forms a negative pressure in the cavity, and draws air from the outside through the one-way air inlet.

[0011] Optionally, a sleeve portion is formed on the sealing cylinder. The sleeve portion is hollow and communicates with the cavity. The extrusion member includes a guide portion and an extrusion portion disposed at the end of the guide portion. The guide portion is movably inserted into the sleeve portion and is sealed to the inner wall of the sleeve portion. A limit ring is provided on the outer wall of the sleeve portion, and the first elastic member is elastically supported between the extrusion portion and the limit ring.

[0012] Optionally, the sealing cylinder is fixedly mounted on the first shaft; The heat dissipation mechanism also includes a rocker arm and a movable ring. The movable ring is movably sleeved on the outer periphery of the extruder. The rocker arm has a rotation center and a first end and a second end respectively disposed on both sides of the rotation center. The first end is disposed near the connecting rod, and the second end is disposed near the movable ring. The linkage is rotatably arranged relative to the transmission mechanism to press against or away from the first end. When the linkage presses against the first end, the second end presses against the movable ring to compress the extruder into a compressed state through the movable ring. A gravity ball is also provided on the second end. When the linkage moves away from the first end, the second end moves away from the movable ring under the action of the gravity ball and releases the extruder into a return state.

[0013] Optionally, the heat dissipation mechanism further includes a reset ring, the speed change mechanism includes a housing, the reset ring is sleeved on the outside of the housing and rotates with the housing, a second elastic element is provided between the reset ring and the housing, and the connecting rod is connected to the reset ring.

[0014] Optionally, the heat dissipation mechanism further includes at least one guide plate, on which an arc-shaped guide groove is formed. The connecting rod is slidably inserted into the arc-shaped guide groove so as to guide the connecting rod to press against the first end or away from the first end through the arc-shaped guide groove.

[0015] The technical solution provided in this application has the following advantages compared with the prior art: The mechanical braking device for a wind turbine generator provided in this application includes a transmission mechanism, a first braking mechanism, a second braking mechanism, and a drive mechanism. The second braking mechanism is located at the low-speed second end and can withstand a large torque for initial strong braking in the initial braking stage. The first braking mechanism is located at the high-speed first end and is used for final braking after the speed has decreased. The drive mechanism includes a drive member and a connecting rod. When the output end of the drive member extends to the first position, the first braking mechanism starts braking. The output end of the drive member also has a function to drive the connecting rod to switch from a disengaged state to a connected state, triggering the second braking mechanism to start braking the second shaft at a second position. That is, when the output end extends to the second position, the second braking mechanism starts braking. In this application, the output end of the drive unit extends to the second position and drives the second braking mechanism to pre-brake the second shaft. Then, the output end continues to extend to the first position to simultaneously drive the first braking mechanism to start braking. At this time, since the second braking mechanism has reduced the speed of the entire system, the speed of the first shaft also drops significantly. The first braking mechanism intervenes at a relatively low speed and torque to apply final and precise braking to the first shaft, bringing it to a complete stop. By setting two sets of braking mechanisms to work together, braking efficiency is improved, a smooth braking buffer is provided, frictional heat is significantly reduced, and the problem of thermal deformation and thermal cracking caused by severe friction overheating of a single brake disc is avoided. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a mechanical braking device for a wind turbine generator set according to an embodiment of this application; Figure 2 This is a schematic diagram of the mechanical braking device of a wind turbine generator set according to an embodiment of this application from another perspective. Figure 3 This is a schematic diagram of the structure of a first braking mechanism according to an embodiment of this application; Figure 4 This is a cross-sectional view of a first braking mechanism according to an embodiment of this application; Figure 5 This is a schematic diagram of the assembly of the linkage rod according to an embodiment of this application; Figure 6This is a schematic diagram of the structure of the second braking mechanism according to an embodiment of this application; Figure 7 This is an exploded view of the second braking mechanism according to an embodiment of this application; Figure 8 This is a schematic diagram of the heat dissipation mechanism according to an embodiment of this application; Figure 9 This is a cross-sectional view of a heat dissipation mechanism according to an embodiment of this application; Figure 10 This is a side view of a heat dissipation mechanism according to an embodiment of this application.

[0019] In the diagram: 1. Gearbox; 11. First shaft; 111. Slide groove; 12. Second shaft; 13. Housing; 2. First braking mechanism; 21. Brake disc; 211. Fourth elastic element; 212. Slider; 22. First brake pad; 23. Second brake pad; 24. Air outlet duct; 25. First bracket; 26. Second bracket; 261. Guide post; 262. Guide sleeve; 263. Third elastic element; 3. Second braking mechanism; 31. First friction element; 32. Second friction element; 321. Notch; 322. Blocking disc; 323. Second rubber ring; 33. First baffle; 331. Heat dissipation hole; 4. Drive mechanism; 41. Drive component; 42. Linkage rod; 421. Locking block; 5. Heat dissipation mechanism; 51. Sealing cylinder; 511. Cavity; 512. One-way air inlet; 513. One-way air outlet; 514. Sleeve part; 515. Limiting ring; 516. Second baffle; 52. Extrusion part; 521. Guide part; 522. Extrusion part; 53. First elastic element; 54. Rocker arm; 541. Gravity ball; 55. Movable ring; 56. Reset ring; 561. Support cylinder; 57. Second elastic element; 58. Guide plate; 581. Arc-shaped guide groove. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0022] The mechanical braking device of this wind turbine generator set will be described in detail below through specific embodiments: Reference Figures 1 to 10As shown in some embodiments of this application, a mechanical braking device for a wind turbine generator set is provided, including a speed change mechanism 1, a first braking mechanism 2, a second braking mechanism 3, and a drive mechanism 4.

[0023] The transmission mechanism 1 includes a first shaft 11 for connecting to the generator set and a second shaft 12 for connecting to the wind turbine blades. The first shaft 11 and the second shaft 12 are connected in a transmission manner. The first braking mechanism 2 is used to brake the first shaft 11, and the second braking mechanism 3 is used to brake the second shaft 12. That is, the second braking mechanism 3 is set at the second end at low speed, which can withstand huge torque in the initial stage of braking to perform initial strong braking. The first braking mechanism 2 is set at the first end at high speed, which is used to perform final braking after the speed has decreased.

[0024] The drive mechanism 4 includes a drive member 41 and a connecting rod 42. The drive member 41 is connected to the first braking mechanism 2, and the output end of the drive member 41 has a first position that triggers the first braking mechanism 2 to start braking the first shaft 11. That is, when the output end extends to the first position, the first braking mechanism 2 starts braking.

[0025] The linkage 42 is connected to the drive member 41 and is configured to have a separated state and a connected state, which are separate from the second braking mechanism 3. That is, in the separated state, the free end of the linkage 42 maintains a certain gap with the second braking mechanism 3 and does not generate any contact or force; in the connected state, the free end of the linkage 42 forms a snap or abutment with the second braking mechanism 3, thereby triggering the action of the second braking mechanism 3. The output end of the drive member 41 also has a second position for driving the linkage 42 to switch from the separated state to the connected state, so as to trigger the second braking mechanism 3 to start braking the second shaft 12. That is, when the output end extends to the second position, the second braking mechanism 3 starts braking. The second position is set closer to the drive member 41 than the first position.

[0026] In this application, when the output end of the drive component 41 extends, it first reaches the second position to drive the second braking mechanism 3 to pre-brake the second shaft 12. Then, the output end continues to extend to the first position to simultaneously drive the first braking mechanism 2 to begin braking. At this time, since the second braking mechanism 3 has reduced the rotational speed of the entire system, the rotational speed of the first shaft 11 also drops significantly. The first braking mechanism 2 intervenes at a relatively low rotational speed and torque to apply final and precise braking to the first shaft 11, bringing it to a complete stop. By setting two sets of braking mechanisms to work together, braking efficiency is improved, a smooth braking buffer is provided, frictional heat is significantly reduced, and the problem of thermal deformation and thermal cracking caused by severe frictional overheating of the single brake disc 21 is avoided.

[0027] The first shaft 11 and the second shaft 12 are connected by a speed-increasing gear set inside the housing 13, which enables the low speed and high torque input of the wind turbine blades to be converted into a high speed and low torque output suitable for the generator.

[0028] In some embodiments, refer to Figure 3 and Figure 4 As shown, the first braking mechanism 2 includes a brake disc 21 and a brake pad assembly. The brake disc 21 is mounted on the first shaft 11 and can rotate with the first shaft 11. The driving member 41 is connected to the brake pad assembly and drives the brake pad assembly to move relative to the brake disc 21 to clamp the brake disc 21 to begin braking, or to release the brake disc 21 to stop braking. That is, the brake pad assembly does not rotate. When it clamps the brake disc 21, it gradually brakes the brake disc 21 under the action of friction, thereby reducing the speed of the first shaft 11. When it is necessary to release the brake, the output end of the driving member 41 moves in the opposite direction, driving the brake pad assembly to release the brake disc 21.

[0029] In a specific implementation, the brake pad assembly includes a first brake pad 22 and a second brake pad 23, which are respectively disposed on both sides of the brake disc 21 to perform friction braking from both sides of the brake disc 21.

[0030] The first brake pad 22 is fixedly disposed relative to the first shaft 11. The first brake pad 22 is directly mounted on the housing 13 of the transmission mechanism 1 by a rigid first bracket 25. The first bracket 25 is L-shaped or U-shaped and spans the outer edge of the brake disc 21.

[0031] The second brake pad 23 is slidably disposed relative to the first shaft 11 along the axial direction of the first shaft 11. The second brake pad 23 can be disposed on the second bracket 26. The driving member 41 can drive the second brake pad 23 to move by driving the second bracket 26 to move.

[0032] The brake disc 21 is slidably connected to the first shaft 11 along the axial direction of the first shaft 11, as shown in the reference. Figure 4 As shown, a groove 111 is provided on the first shaft 11, and a slider 212 is provided on the brake disc 21. The groove 111 extends along the axial direction of the first shaft 11, and the slider 212 is slidably disposed in the groove 111 to drive the brake disc 21 to slide relative to the first shaft 11.

[0033] The drive unit 41 is connected to the second brake pad 23. The drive unit 41 drives the second brake pad 23 to move the brake disc 21 toward the first brake pad 22 to clamp the brake disc 21.

[0034] In practice, the output end of the drive member 41 is connected to the second bracket 26 to drive the second brake pad 23 to move. When the output end of the drive member 41 reaches the first position, its continued extension pushes the second brake pad 23, causing it to move towards the brake disc 21 along the axial direction of the first shaft 11. The second brake pad 23 first contacts and presses against one side of the brake disc 21. Since the brake disc 21 itself is also axially slidably connected to the first shaft 11, when the second brake pad 23 presses against the brake disc 21 from one side, the brake disc 21 will undergo a slight displacement along the axial direction of the first shaft 11 until its other side is tightly fitted with the fixed first brake pad 22.

[0035] At this time, the brake disc 21 is firmly clamped between the first brake pad 22 and the second brake pad 23. Under the action of friction, the rotational kinetic energy of the brake disc 21 is converted into heat energy, thereby achieving the final braking of the first shaft 11.

[0036] The greater the thrust at the output end of the drive member 41, the greater the normal pressure between the brake pad assembly and the brake disc 21, and the greater the braking torque. When it is necessary to release the brake, the output end of the drive member 41 moves in the opposite direction, causing the second brake pad 23 to move away from the brake disc 21. At this time, the brake disc 21 can freely slide and reset on the first shaft 11, or be reset by a fourth elastic member 211 sleeved on the first shaft 11, as described above. Figure 4 As shown, this causes the brake disc 21 to disengage from the first brake pad 22, thus releasing the brake.

[0037] Furthermore, referring to Figure 3 As shown, the second bracket 26 is also slidably connected to the housing 13 of the transmission mechanism 1. For example, the second bracket 26 is provided with a guide post 261, and the housing 13 is provided with a guide sleeve 262. The guide post 261 is slidably inserted into the guide sleeve 262. A third elastic element 263 is provided between the guide post 261 and the guide sleeve 262. When the external force of the driving member 41 is removed, the second bracket 26 can return to its initial position under the action of the third elastic element 263 to avoid excessive impact.

[0038] In practice, multiple sets of brake disc 21 and brake pad assembly can be set according to actual braking requirements to ensure braking efficiency.

[0039] In some embodiments, refer to Figure 2 , Figure 6 and Figure 7The second braking mechanism 3 shown includes a first friction element 31 and a second friction element 32. The first friction element 31 is sleeved on the second shaft 12 and rotates synchronously with the second shaft 12. The second friction element 32 is sleeved on the outer periphery of the first friction element 31 and is in frictional engagement with the first friction element 31. The second friction element 32 is provided with a notch 321, and the connecting rod 42 is provided with a locking block 421. When the output end of the driving member 41 is in the second position, the locking block 421 is locked in the notch 321 so that the connecting rod 42 is in the connected state, thereby restricting the rotation of the second friction element 32.

[0040] When the braking command is issued, the output end of the drive component 41 extends, first reaching the second position. At this time, the connecting rod 42 is driven to switch to the connected state. In the connected state, the locking block 421 at the end of the connecting rod 42 accurately engages into the notch 321 of the second friction component 32, locking the second friction component 32 to a standstill. Since the first friction component 31 rotates continuously with the second shaft 12, while the second friction component 32 is locked, intense sliding friction is generated between the two. This frictional torque acts directly on the second shaft 12, forming a strong braking force. Because the second shaft 12 is in a low-speed, high-torque state, this braking torque is amplified, which can quickly stop the rotation of the wind turbine blades and consume most of the kinetic energy of the entire transmission chain.

[0041] By rationally designing the interference fit, contact area, and friction coefficient of the materials between the first friction component 31 and the second friction component 32, the magnitude of the braking torque generated in this stage can be precisely controlled, so that it can effectively decelerate without causing excessive mechanical impact.

[0042] In some embodiments, the second braking mechanism 3 further includes a first baffle 33, which is fixedly mounted on the second shaft 12 and covers the first friction member 31 and at least part of the second friction member 32. The first baffle 33 can be used as a protective cover to prevent external dust, moisture or debris from entering the friction interface and ensure the reliability of initial braking in harsh environments; it can also be used as a clamping element, which can apply axial preload to the second friction member 32 by providing second baffles 516 on both sides, preventing it from moving due to vibration in the non-braking state and avoiding accidental friction.

[0043] The first baffle 33 has heat dissipation holes 331 that extend through the thickness of the first baffle 33, so that the large amount of heat generated by the first friction member 31 and the second friction member 32 during intense relative rotational friction can be quickly dissipated to the external environment through convection and radiation, thus preventing heat from accumulating in a small space and causing the rubber material to age.

[0044] The first friction element 31 includes a first rubber ring, which is fixedly mounted on the second shaft 12. Specifically, the first rubber ring is made of high wear-resistant and high-temperature resistant rubber, and its inner ring is fixedly connected to the second shaft 12 by vulcanization or adhesive bonding.

[0045] The second friction component 32 includes a blocking disk 322 and a second rubber ring 323 embedded in the middle of the blocking disk 322. The second rubber ring 323 is also made of wear-resistant rubber material. The second rubber ring 323 and the first rubber ring are in frictional fit, which has the advantages of more stable friction coefficient, lower noise, and less wear of mating parts. Even if the rubber wears after long-term operation, the second rubber ring 323 and the first rubber ring can still maintain close contact under the elastic action of interference fit, and have self-compensation ability.

[0046] The edge of the blocking disc 322 has a notch 321. Understandably, the blocking disc 322 can be made of a harder material. When the locking block 421 is engaged in the notch 321, it locks the second friction member 32, ensuring the locking effect.

[0047] For example, refer to Figure 7 As shown, the first rubber ring and the second rubber ring 323 are respectively provided with mutually fitting grooves and protrusions. The grooves and protrusions fit and engage with each other. However, since the first rubber ring and the second rubber ring 323 are made of elastic material, the grooves and protrusions on the first rubber ring and the second rubber ring 323 will still rotate relative to each other when deformed.

[0048] In some embodiments, the mechanical braking device of the wind turbine generator set further includes a heat dissipation mechanism 5 for cooling the first braking mechanism 2.

[0049] Specifically, the heat dissipation mechanism 5 includes a sealing cylinder 51, the inside of which is formed a cavity 511. The sealing cylinder 51 is provided with a one-way air inlet 512 and a one-way air outlet 513 communicating with the cavity 511. That is, air can only enter the cavity 511 from the outside through the one-way air inlet 512 and can only be discharged from the cavity 511 through the one-way air outlet 513.

[0050] The first braking mechanism 2 is provided with an air outlet channel 24, which is connected to a one-way air outlet 513 to spray cooling airflow onto the friction interface of the first braking mechanism 2.

[0051] A squeezing member 52 is movably disposed on the sealing cylinder 51, and a first elastic member 53 is disposed between the squeezing member 52 and the sealing cylinder 51. The squeezing member 52 is configured to have a squeezing state in which it moves toward the cavity 511 to squeeze the air in the cavity 511 and discharge it through the one-way air outlet 513, and a returning state in which it moves away from the cavity 511 and forms a negative pressure in the cavity 511 and draws air from the outside through the one-way air inlet 512. In the initial state, the air pressure inside and outside the cavity 511 is balanced. When subjected to external force, the squeezing member 52 overcomes the elastic force of the first elastic member 53 and moves toward the inside of the sealing cylinder 51 (i.e. toward the cavity 511). At this time, the inner end of the squeezing member 52 compresses the air in the cavity 511, causing the pressure in the cavity 511 to increase. The one-way air outlet 513 opens, and high-pressure air is sprayed at high speed through the air outlet channel 24 toward the heating surface of the first braking mechanism 2. When the external force disappears, the extrusion member 52 quickly returns to its outward position under the action of the first elastic member 53, the volume of the cavity 511 increases to form a negative pressure, the one-way air inlet 512 opens, and external cold air is drawn into the cavity 511 to prepare for the next exhaust.

[0052] Multiple extrusion elements 52 are evenly distributed along the circumference of the sealing cylinder 51. Each rotation of the sealing cylinder 51 generates multiple pulsed airflows, which converge into the air outlet channel 24, forming a continuous, pulsating cooling airflow with a considerable average flow rate. Simultaneously, since the first shaft 11 has not completely stopped during braking, its rotational motion can provide a free power source for the heat dissipation mechanism 5. The more urgent the braking (the higher the rotational speed of the first shaft 11), the higher the pulse frequency of the cooling airflow and the greater the heat dissipation intensity, achieving an adaptive match between braking intensity and cooling intensity. This mechanism is completely independent of the electrical system and has extremely high reliability.

[0053] In specific implementation, refer to Figure 9 and Figure 10 As shown, a sleeve portion 514 is formed on the sealing cylinder 51. The sleeve portion 514 is hollow and communicates with the cavity 511. The extrusion member 52 includes a guide portion 521 and an extrusion portion 522 disposed at the end of the guide portion 521. The guide portion 521 is movably inserted into the sleeve portion 514, and the guide portion 521 is sealed to the inner wall of the sleeve portion 514, similar to a piston structure. A limit ring 515 is provided on the outer wall of the sleeve portion 514. A first elastic member 53 is elastically supported between the extrusion portion 522 and the limit ring 515. Specifically, the sleeve portion 514 is integrally cast or welded to the sealing cylinder 51. Each sleeve portion 514 is hollow and its internal channel is directly connected to the cavity 511 in the center of the sealing cylinder 51. The inner wall of the sleeve portion 514 is precision honed, having high cylindricity and low surface roughness, to serve as a guide structure for the extrusion member 52. Furthermore, a piston ring or rubber seal can be installed at the end of the guide section 521 to ensure airtightness.

[0054] In some embodiments, the sealing cylinder 51 is fixedly mounted on the first shaft 11 and can rotate together with the first shaft 11. A plurality of extrusion members 52 are evenly distributed circumferentially on the sealing cylinder 51 and rotate together with the sealing cylinder 51.

[0055] The heat dissipation mechanism 5 also includes a rocker arm 54 and a movable ring 55. The movable ring 55 is movably sleeved on the outer periphery of the extruder 52 and can move relative to the extruder 52 and the sealing cylinder 51. Specifically, the movable ring 55 is a circular ring-shaped component that is movably sleeved on the periphery of all extruders 52. More specifically, the inner diameter of the movable ring 55 is slightly larger than the maximum radius of rotation of the extruder 52, allowing the movable ring 55 to slide axially relative to the axis of the extruder 52, but the movable ring 55 itself does not rotate with the extruder 52. Specifically, a second baffle 516 is provided on both sides of the sealing cylinder 51, and the movable ring 55 is confined between the two second baffles 516 to prevent it from coming off.

[0056] The rocker arm 54 is rotatably mounted relative to the housing 13 of the transmission mechanism 1 and does not rotate with the first shaft 11. The rocker arm 54 has a rotation center (for example, mounted on the housing 13 via a hinge shaft or directly on the ground) and a first end and a second end respectively located on both sides of the rotation center. The first end is located near the connecting rod 42 and the second end is located near the movable ring 55.

[0057] The linkage 42 is rotatably configured relative to the transmission mechanism 1 to press against or away from the first end. When the linkage 42 presses against the first end, the second end presses against the movable ring 55, so that the movable ring 55 presses against the extruder 52 to put it in a compressed state. A gravity ball 541 is also provided on the second end. When the linkage 42 moves away from the first end, the second end moves away from the movable ring 55 under the action of the gravity ball 541 and releases the extruder 52 to return to its original position.

[0058] In the unbraked state, the linkage 42 is in a disengaged state and does not contact the first end of the rocker arm 54. Under the gravitational torque of the gravity ball 541, the second end of the rocker arm 54 is in a low position (away from the movable ring 55). At this time, the movable ring 55 is not compressed, and the extrusion member 52 is in an extended state under the action of the first elastic member 53. The heat dissipation mechanism 5 does not exhaust. When the braking command is issued, when the output end of the drive member 41 extends to the second position, the linkage 42 is driven to switch from the disengaged state to the connected state. At the same time, the linkage 42 swings and presses against the first end of the rocker arm 54. The rocker arm 54 rotates around its rotation center, and its second end lifts upward against the gravitational torque of the gravity ball 541, thereby pressing against the movable ring 55. After being subjected to force, the movable ring 55 moves axially and simultaneously presses against the extrusion part 522 of the extrusion member 52 that is in contact with it and is now located directly opposite the movable ring 55. The extrusion member 52 is axially compressed, generating a first exhaust.

[0059] Meanwhile, the sealing cylinder 51 and the extruder 52 are rotating at high speed with the first shaft 11. When the extruder 52 is compressed, it moves away from the position opposite to the movable ring 55 as the sealing cylinder 51 rotates. At this time, the extruder 52 returns to its original position and draws in air. Each time the sealing cylinder 51 rotates, one or more extruders 52 will move to the position opposite to the movable ring 55, be pressed by the movable ring 55 once, and exhaust air once. After rotating, the movable ring 55 remains in the fixed axial position, but the extruder 52 has moved away and returns to its original position to draw in air under the action of the first elastic element 53. When the next extruder 52 arrives, it is pressed again. In this way, as long as the connecting rod 42 continues to press the first end of the rocker arm 54 (i.e., during the braking process of the first braking mechanism 2), the second end of the rocker arm 54 can keep the movable ring 55 in a constant pressing position, and the rotating extruder 52 will be periodically triggered to generate a continuous pulse airflow. When the brake is released, the linkage 42 moves away from the first end of the rocker arm 54, and the second end of the rocker arm 54 falls away from the movable ring 55 under the gravitational torque of the gravity ball 541. The movable ring 55 no longer presses the extrusion part 52, and heat dissipation stops.

[0060] In some embodiments, refer to Figure 2 and Figure 5 As shown, the heat dissipation mechanism 5 also includes a reset ring 56, and the transmission mechanism 1 includes a housing 13. The reset ring 56 is sleeved on the outside of the housing 13 and rotates with the housing 13. A second elastic element 57 is provided between the reset ring 56 and the housing 13, and the connecting rod 42 is connected to the reset ring 56. That is, the reset ring 56 can freely rotate around the axis of the housing 13 (i.e., the common axis of the first shaft 11 and the second shaft 12), but is limited in the axial direction. When the locking block 421 on the connecting rod 42 engages with the notch 321 on the second friction element 32, the connecting rod 42 will drive the reset ring 56 to rotate relative to the housing 13 under the drive of the second friction element 32, thereby compressing or stretching the second elastic element 57 and storing elastic potential energy. When the connecting rod 42 is in the separated state, the second elastic element 57 releases its stored energy, driving the reset ring 56 to drive the connecting rod 42 to rotate in the opposite direction, automatically returning to the initial separated state position. By setting a reset ring 56 that rotates with the housing 13 and a second elastic element 57 that connects the two, and connecting the linkage rod 42 to the reset ring 56, a stable and reliable rotation reset function is provided for the linkage rod 42, ensuring that the heat dissipation mechanism 5 can immediately stop and return to its original position to prepare for the next heat dissipation operation after the brake is released.

[0061] In some embodiments, the heat dissipation mechanism 5 further includes at least one guide plate 58, which can be fixedly installed on the housing 13 of the transmission mechanism 1 or a stationary component such as the ground. An arc-shaped guide groove 581 is provided on the guide plate 58, and the connecting rod 42 is slidably inserted into the arc-shaped guide groove 581 to guide the connecting rod 42 towards or away from the first end. When the second friction member 32 drives the connecting rod 42 to rotate, due to the constraint of the arc-shaped guide groove 581, the connecting rod 42 moves along a precise, predetermined arc. Further, a support cylinder 561 is provided on the reset ring 56, and a clearance groove is provided inside the support cylinder 561. The connecting rod 42 passes through the clearance groove to drive the reset ring 56 to rotate relative to the housing 13. The shape of the clearance groove is adapted to the swing trajectory of the connecting rod 42 relative to the housing 13 to avoid interference.

[0062] In practice, two guide plates 58 are provided, one on each side of the first shaft 11 and the other on the same side of the second shaft 12, to ensure stable swinging. They can be mounted on the first shaft 11 and the second shaft 12, or they can be directly supported on the ground. The drive component 41 is provided on the guide plate 58 where the first shaft 11 is located, and can be a hydraulic push rod or other structure.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0064] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical braking device for a wind turbine generator set, characterized in that, include: The transmission mechanism (1) includes a first shaft (11) for connecting to a generator set and a second shaft (12) for connecting to a wind turbine blade, wherein the first shaft (11) and the second shaft (12) are connected in a transmission manner. The first braking mechanism (2) is used to brake the first shaft (11); The second braking mechanism (3) is used to brake the second shaft (12); The drive mechanism (4) includes a drive member (41) and a connecting rod (42). The drive member (41) is connected to the first braking mechanism (2), and the output end of the drive member (41) has a first position that triggers the first braking mechanism (2) to start braking the first shaft (11). The connecting rod (42) is connected to the drive member (41) and is configured to have a separated state and a connected state that are separated from the second braking mechanism (3). The output end of the drive member (41) also has a second position that drives the connecting rod (42) to switch from the separated state to the connected state to trigger the second braking mechanism (3) to start braking the second shaft (12). The second position is positioned closer to the drive unit (41) than the first position.

2. The mechanical braking device for a wind turbine generator set according to claim 1, characterized in that, The first braking mechanism (2) includes a brake disc (21) and a brake pad assembly. The brake disc (21) is sleeved on the first shaft (11). The driving member (41) is connected to the brake pad assembly and drives the brake pad assembly to move relative to the brake disc (21) to clamp the brake disc (21) to start braking, or to release the brake disc (21) to stop braking.

3. The mechanical braking device for a wind turbine generator set according to claim 2, characterized in that, The brake pad assembly includes a first brake pad (22) and a second brake pad (23), with the first brake pad (22) and the second brake pad (23) respectively disposed on both sides of the brake disc (21); The first brake pad (22) is fixed relative to the first shaft (11), the second brake pad (23) is slidably disposed relative to the first shaft (11) along the axial direction of the first shaft (11), and the brake disc (21) is slidably connected to the first shaft (11) along the axial direction of the first shaft (11). The driving member (41) is connected to the second brake pad (23), and the driving member (41) drives the second brake pad (23) to move the brake disc (21) toward the first brake pad (22) to clamp the brake disc (21).

4. The mechanical braking device for a wind turbine generator set according to claim 1, characterized in that, The second braking mechanism (3) includes a first friction element (31) and a second friction element (32). The first friction element (31) is sleeved on the second shaft (12), and the second friction element (32) is sleeved on the outer periphery of the first friction element (31). The second friction element (32) is in frictional engagement with the first friction element (31). The second friction element (32) is provided with a notch (321). The connecting rod (42) is provided with a locking block (421). When the output end of the driving member (41) is in the second position, the locking block (421) is locked in the notch (321) so that the connecting rod (42) is in the connected state, thereby restricting the rotation of the second friction element (32).

5. The mechanical braking device for a wind turbine generator set according to claim 4, characterized in that, The second braking mechanism (3) further includes a first baffle (33), which is fixedly mounted on the second shaft (12) and covers the first friction member (31) and at least part of the second friction member (32). The first baffle (33) has heat dissipation holes (331). The first friction element (31) includes a first rubber ring, which is fixedly mounted on the second shaft (12). The second friction element (32) includes a blocking disk (322) and a second rubber ring (323) embedded in the middle of the blocking disk (322). The second rubber ring (323) and the first rubber ring are in frictional engagement. The edge of the blocking disk (322) is provided with the notch (321).

6. The mechanical braking device for a wind turbine generator set according to any one of claims 1 to 5, characterized in that, The mechanical braking device of the wind turbine generator set also includes a heat dissipation mechanism (5), which includes a sealing cylinder (51). A cavity (511) is formed inside the sealing cylinder (51), and a one-way air inlet (512) and a one-way air outlet (513) communicating with the cavity (511) are provided on the sealing cylinder (51). The first braking mechanism (2) is provided with an air outlet channel (24), which is connected to the one-way air outlet (513); An extrusion member (52) is movably disposed on the sealing cylinder (51), and a first elastic member (53) is disposed between the extrusion member (52) and the sealing cylinder (51). The extrusion member (52) is configured to have a compression state in which it moves toward the cavity (511) to expel the air in the cavity (511) through the one-way air outlet (513), and a return state in which it moves away from the cavity (511) and forms a negative pressure in the cavity (511) and draws air from the outside through the one-way air inlet (512).

7. The mechanical braking device for a wind turbine generator set according to claim 6, characterized in that, A sleeve portion (514) is formed on the sealing cylinder (51). The sleeve portion (514) is hollow and communicates with the cavity (511). The extrusion member (52) includes a guide portion (521) and an extrusion portion (522) disposed at the end of the guide portion (521). The guide portion (521) is movably inserted into the sleeve portion (514), and the guide portion (521) is sealed to the inner wall of the sleeve portion (514). A limit ring (515) is provided on the outer wall of the sleeve portion (514). The first elastic member (53) is elastically supported between the extrusion portion (522) and the limit ring (515).

8. The mechanical braking device for a wind turbine generator set according to claim 7, characterized in that, The sealing cylinder (51) is fixedly mounted on the first shaft (11); The heat dissipation mechanism (5) further includes a rocker arm (54) and a movable ring (55). The movable ring (55) is movably sleeved on the outer periphery of the extruder (52). The rocker arm (54) has a rotation center and a first end and a second end respectively disposed on both sides of the rotation center. The first end is disposed near the connecting rod (42), and the second end is disposed near the movable ring (55). The linkage rod (42) is rotatably arranged relative to the speed change mechanism (1) to press against the first end or away from the first end. When the linkage rod (42) presses against the first end, the second end presses against the movable ring (55) to squeeze the extruder (52) into a squeezed state through the movable ring (55). A gravity ball (541) is also provided on the second end. When the linkage rod (42) moves away from the first end, the second end moves away from the movable ring (55) under the action of the gravity ball (541) and releases the extruder (52) into a return state.

9. The mechanical braking device for a wind turbine generator set according to claim 8, characterized in that, The heat dissipation mechanism (5) further includes a reset ring (56), the speed change mechanism (1) includes a housing (13), the reset ring (56) is sleeved on the outside of the housing (13), and the reset ring (56) is rotatably engaged with the housing (13). A second elastic element (57) is provided between the reset ring (56) and the housing (13), and the connecting rod (42) is connected to the reset ring (56).

10. The mechanical braking device for a wind turbine generator set according to claim 8, characterized in that, The heat dissipation mechanism (5) further includes at least one guide plate (58), on which an arc-shaped guide groove (581) is provided. The connecting rod (42) is slidably inserted into the arc-shaped guide groove (581) so as to guide the connecting rod (42) to press against or away from the first end through the arc-shaped guide groove (581).

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