Brake device of wind power generation set

Abstract

The invention discloses a brake device of a wind power generation unit, and relates to the technical field of wind power generation structures, and the brake device is characterized by comprising a mounting bottom plate, a connecting shaft, a brake disc and a brake pad, a liquid storage tank for storing cooling liquid is arranged on the mounting bottom plate, a pump body unit is arranged on the liquid storage tank, and a plurality of through-flow cavities are formed in the connecting shaft; the two ends of the through-flow cavity communicate with the pump body unit and the liquid storage tank. A mounting frame is arranged on the mounting bottom plate, and a conversion unit and a trigger unit are arranged on the mounting frame and used for forming transmission between the conversion unit and the connecting shaft when the brake pad generates braking. According to the brake device, the liquid storage tank storing the cooling liquid is arranged on one side of the brake disc, the through-flow cavity is formed in the connecting shaft, and linkage triggering of the pump body unit, the conversion unit and the triggering unit is matched, so that the cooling liquid can be pumped and circulated in the connecting shaft through rotation kinetic energy of the connecting shaft when the brake pad conducts braking; therefore, the brake pad is cooled, and the overall braking stability is improved.

Description

Technical Field

[0001] This invention relates to the field of wind power generation structure technology, and specifically to a braking device for a wind power generator. Background Technology

[0002] Wind turbine generators have a two-stage braking system. The first stage achieves deceleration by adjusting the angle of the external blades, while the second stage uses a mechanical friction brake as an auxiliary or emergency braking method. This mainly involves placing the brake disc between the gearbox and the generator and making them rotate coaxially. When deceleration is required, the hydraulic system drives the brake pads to clamp the brake disc, thereby using friction braking. However, this process generates a lot of heat. Due to the confined space in the nacelle, the temperature of the brake disc rises rapidly, causing the coefficient of friction to decrease, which greatly reduces braking efficiency and may even lead to brake failure or fire hazards.

[0003] Therefore, this invention was designed to solve the above-mentioned problems.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a braking device for wind power generation units.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A braking device for a wind turbine generator includes a mounting base plate, a connecting shaft with bearings mounted on the mounting base plate and coaxially rotating with the gearbox and generator, a brake disc mounted on the connecting shaft, and brake pads fitted to the outer end of the brake disc. The mounting base plate has a reservoir for storing coolant, and a pump unit for pumping coolant is mounted on the reservoir. Multiple flow passages are evenly distributed inside the connecting shaft, with both ends of each flow passage connected to the pump unit and the reservoir, forming a liquid circuit. The mounting base plate also has a mounting frame, which houses a conversion unit that converts the power from the connecting shaft to the pump unit's pumping power, and a trigger unit located between the brake pads and the conversion unit. The trigger unit is used to establish a transmission between the conversion unit and the connecting shaft when the brake pads apply braking force.

[0007] Furthermore, the brake discs are symmetrically arranged in two sets on both sides of the connecting shaft, and two sets of semi-enclosed disc covers are also fixedly installed on the mounting base plate. The two sets of disc covers move and abut against the two sets of brake discs respectively, forming an annular confluence cavity that communicates with the flow passage cavity. The pump body unit includes a piston cylinder arranged on the liquid storage tank, a piston plate that seals and slides inside the piston cylinder, and two sets of one-way valves arranged on the piston cylinder and communicating with its interior. The one-way valves are respectively connected to the liquid storage tank and one set of annular manifolds through pipelines, so that the liquid storage tank supplies liquid to the piston cylinder unidirectionally, and the piston cylinder supplies liquid to the flow-through cavity unidirectionally; The annular manifold not connected to the one-way valve is connected to the liquid storage tank through a pipeline.

[0008] Furthermore, there are two sets of the mounting brackets, and a groove in the shape of "凵" is arranged at the upper end. The conversion unit includes a support plate that is clamped in the groove and slides up and down with limited position, a reciprocating threaded rod fixed between the two support plates, a screw sleeve sleeved on the reciprocating threaded rod, and a connecting rod arranged between the screw sleeve and the piston plate and movably penetrating through the outer wall of the piston cylinder; The surfaces of the connecting shaft and the screw sleeve are provided with meshing tooth surfaces, and the tooth surface on the connecting shaft has the same length as the reciprocating threaded rod.

[0009] Furthermore, a first spring is also arranged between the support plate and the bottom surface of the groove, so that the tooth surfaces of the screw sleeve and the connecting shaft are not meshed in the normal state. Annular grooves for the end portions of the connecting rod to be clamped and slide are arranged on both sides of the screw sleeve, and one end of the first spring far from the annular groove is rotatably connected to the piston plate.

[0010] Furthermore, the trigger unit includes a seesaw whose middle section is hinged to the mounting bracket, a top pressing plate arranged at the end of the seesaw and movably abutted against the upper surface of the support plate, a rear rod arranged at the end of the seesaw far from the top pressing plate, and a top pushing arm arranged on the brake pad; The end of the top pushing arm far from the brake pad is provided with a wedge-shaped surface that is movably abutted against the rear rod, so that the top pushing arm will abut against the rear rod and lift when the brake pad brakes.

[0011] Furthermore, both sides of the flow-through cavity are connected to the annular manifold through inverted trapezoidal opening grooves opened on the connecting shaft. An active paddle is arranged in the opening groove on the same side of the disk cover connected to the liquid storage tank. Limiting clamping rods fixed to the side walls of the opening groove at both ends are arranged on both sides of the active paddle, so that the active paddle is limited to slide in the radial direction of the connecting shaft. A pushed arc plate whose two sides are movably abutted against the inner wall of the opening groove is arranged at the bottom of the active paddle, and a second spring is arranged between the pushed arc plate and the bottom wall of the opening groove.

[0012] Furthermore, inner converging arc plates are also arranged on both sides of the upper opening of the opening groove accommodating the active paddle, so that the communication port between the opening groove and the annular manifold is narrowed, and the inner converging arc plate does not fit with the active paddle.

[0013] Furthermore, a baffle plate extending toward the axis of the connecting shaft is provided on the inner wall of the flow passage cavity near the movable paddle plate, and one end of the pushed arc plate movably abuts against the outer wall of the baffle plate.

[0014] Compared with the prior art, the beneficial effects of this solution are: by setting a reservoir for storing coolant on one side of the brake disc and opening a flow passage cavity in the connecting shaft, and by coordinating the linkage of the pump unit, the conversion unit and the triggering unit, the coolant can be pumped and circulated in the connecting shaft by the rotational kinetic energy of the connecting shaft when the brake pads are braking, thereby cooling the brake pads and improving the overall braking stability. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a front view structural diagram of an embodiment of the present invention; Figure 2 This is a side view structural diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the combination relationship between the connecting shaft and the mounting bracket in an embodiment of the present invention; Figure 4 This is a schematic diagram showing the relative relationship between the mounting bracket and the reciprocating threaded screw in an embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the cooperation relationship between the mounting frame and the support plate in an embodiment of the present invention; Figure 6 This is a schematic diagram of the cooperation relationship between the push arm and the rear rod in an embodiment of the present invention; Figure 7 This is a side sectional perspective view of the connecting shaft in an embodiment of the present invention; Figure 8 This is a cross-sectional perspective view of the connecting shaft in an embodiment of the present invention; Figure 9 This is a schematic diagram of the overall structure of the connecting shaft in an embodiment of the present invention; Figure 10 This is a front cross-sectional view of the position of the movable paddle plate on the connecting shaft in an embodiment of the present invention; Figure 11 This is a schematic diagram showing the positional relationship of the baffle plate within the flow passage cavity in an embodiment of the present invention; Figure 12 This is a schematic diagram of the internal structure of the piston cylinder in an embodiment of the present invention.

[0016] In the diagram: 1. Mounting base plate; 11. Connecting shaft; 12. Brake disc; 13. Brake pad; 2. Liquid reservoir; 21. Flow passage cavity; 22. Mounting bracket; 23. Disc cover; 24. Annular manifold; 3. Piston cylinder; 31. Piston plate; 32. One-way valve; 4. Groove; 41. Support plate; 42. Reciprocating threaded screw; 43. Screw sleeve; 44. Connecting rod; 5. First spring; 51. Annular groove; 6. Rocker; 61. Top pressure plate; 62. Rear rod; 63. Pushing arm; 7. Opening groove; 71. Movable paddle plate; 72. Limiting rod; 73. Pushing arc plate; 74. Second spring; 8. Inward-curving arc plate; 81. Baffle plate. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1-12 The braking device of a wind turbine generator shown includes a mounting base plate 1, a connecting shaft 11 with bearings mounted on the mounting base plate 1 and coaxially rotating with the gearbox and generator, a brake disc 12 mounted on the connecting shaft 11, and brake pads 13 fitted to the outer end of the brake disc 12. The mounting base plate 1 has a coolant reservoir 2, and the coolant reservoir 2 has a pump unit for pumping coolant. Multiple flow passages 21 are evenly distributed inside the connecting shaft 11, with both ends of each flow passage 21 connected to the pump unit and the coolant reservoir 2. The mounting base plate 1 also has a mounting bracket 22, which has a conversion unit and a brake pad 13 located on the brake pad 13. The triggering unit between the 3rd and the conversion unit, under normal conditions, does not form a transmission connection between the conversion unit and the connecting shaft 11. However, when the brake pad 13 starts to brake, it will trigger the conversion unit to form a transmission connection between the conversion unit and the connecting shaft 11 through the triggering unit, thereby converting the rotational kinetic energy of the connecting shaft 11 into the pumping power of the pump body unit, and then pumping the coolant in the reservoir 2 to the flow passage 21. The coolant in the flow passage 21 then flows back to the reservoir 2, forming a liquid circuit. Thus, during braking, the coolant absorbs the heat generated on the brake disc 12, causing its temperature to drop rapidly, preventing the decrease in braking force caused by the decrease in friction efficiency due to heat fade.

[0019] In one embodiment, two sets of brake discs 12 are symmetrically arranged on both sides of the connecting shaft 11. Two sets of semi-enclosed disc covers 23 are also fixedly installed on the mounting base plate 1. The two sets of disc covers 23 are movably engaged with the two sets of brake discs 12, and are sealed with oil to maintain their airtightness. An annular manifold 24, communicating with the flow passage 21, is formed between the disc covers 23 and the brake discs 12. The pump unit includes a piston cylinder 3 mounted on the reservoir 2, a piston plate 31 that slides and seals within the piston cylinder 3, and two sets of one-way valves 32 mounted on and communicating with the piston cylinder 3. The one-way valves 32 are respectively connected to the reservoir 2 and one of the annular manifold 24 via pipes, allowing the reservoir 2 to unidirectionally supply liquid to the piston cylinder 3. The flow passage 21 delivers coolant in one direction. The annular manifold 24, which is not connected to the one-way valve 32, is connected to the reservoir 2 through a pipe. When the piston plate 31 reciprocates in the piston cylinder 3, it draws the coolant from the reservoir 2 into the piston cylinder 3 and pumps it to the annular manifold 24 on one side. The annular manifold 24 then distributes the coolant to each flow passage 21 for transport. It then gathers in the annular manifold 24 on the other side and flows back to the reservoir 2 through a pipe. When the coolant is in the annular manifold 24, it will directly contact the brake disc 12 and absorb heat quickly. The brake disc 12 is connected to the connecting shaft 11 and conducts heat. Therefore, the coolant in the flow passage 21 can indirectly absorb heat, which can significantly reduce the temperature of the brake disc 12.

[0020] In one embodiment, the mounting bracket 22 is in two sets, and the upper end is provided with a U-shaped groove 4. The conversion unit includes a support plate 41 that is engaged and slides vertically and vertically within the groove 4, a reciprocating threaded rod 42 fixed between the two sets of support plates 41, a rod sleeve 43 sleeved on the reciprocating threaded rod 42, and a connecting rod 44 disposed between the rod sleeve 43 and the piston plate 31 and movably passing through the outer wall of the piston cylinder 3. The surfaces of the connecting shaft 11 and the rod sleeve 43 are provided with meshing tooth surfaces, and the tooth surface on the connecting shaft 11 is the same length as the reciprocating threaded rod 42. A first spring 5 is also provided between the support plate 41 and the bottom surface of the groove 4, so that the tooth surfaces of the rod sleeve 43 and the connecting shaft 11 are in a normal state. The lower part is not engaged. The lead screw sleeve 43 has annular grooves 51 on both sides for the end of the connecting rod 44 to slide and engage. The end of the first spring 5 away from the annular groove 51 is rotatably connected to the piston plate 31. The triggering unit includes a rocker plate 6 hinged to the mounting bracket 22 in the middle section, a top pressure plate 61 located at the end of the rocker plate 6 and movably abutting against the upper surface of the support plate 41, a rear rod 62 located at the end of the rocker plate 6 away from the top pressure plate 61, and a push arm 63 located on the brake pad 13. The end of the push arm 63 away from the brake pad 13 is configured as a wedge-shaped surface that movably abuts against the rear rod 62. In normal conditions, the connecting shaft 11 is connected to the generator and gearbox via flanges on both sides, thus serving as a simple transmission component. The teeth on the sleeve 43 and the connecting shaft 11 do not mesh, thus preventing the power from the connecting shaft 11 from being distributed to the screw sleeve 43 and affecting power generation efficiency. When meshing is required, the brake pad 13 moves towards the brake disc 12 to clamp it. The movement of the brake pad 13 drives the push arm 63 to move. The push arm 63 then pushes the rear rod 62 through its wedge-shaped surface, causing it to rise. This causes the top pressure plate 61 at the other end of the rocker 6 to fall, pushing the support plate 41 downward. The support plate 41 drives the reciprocating threaded screw 42 and the screw sleeve 43 downward as a whole, thus causing the teeth on the connecting shaft 11 and the screw sleeve 43 to mesh and transmit power. At this time, the screw sleeve 43 begins to rotate and reciprocates in the threaded... The lead screw 42 reciprocates, and the lead screw sleeve 43, in its reciprocating motion, synchronously drives the piston plate 31 to reciprocate through the connecting rods 44 on both sides, thereby realizing the pumping of coolant. At the same time, since the end of the connecting rod 44 is rotatably connected to the piston plate 31, the lead screw sleeve 43 can rotate slightly as it moves downward, without affecting the overall reciprocating transmission. This linkage structure ensures the precise synchronization of braking and heat dissipation processes. Moreover, the more urgent the braking, the higher the speed of the connecting shaft 11, which in turn makes the reciprocating motion of the lead screw sleeve 43 and the piston plate 31 faster, resulting in faster coolant circulation and improved cooling efficiency. The overall system has strong adaptability and high stability.

[0021] In one embodiment, the flow passage 21 is connected to the annular confluence cavity 24 via inverted trapezoidal openings 7 on the connecting shaft 11. A movable paddle plate 71 is installed in the opening 7 on the same side as the disc cover 23 connected to the storage tank 2. Limiting rods 72, fixed at both ends to the sidewalls of the opening 7, are provided on both sides of the movable paddle plate 71, limiting its sliding along the radial direction of the connecting shaft 11. A push-bearing arc plate 73, with both sides movably abutting against the inner wall of the opening 7, is provided at the bottom of the movable paddle plate 71. A second spring 74 is installed between the push-bearing arc plate 73 and the bottom wall of the opening 7. When the coolant is pumped into the flow passage 21 and connected to the storage tank 2... When the coolant flows and converges in the annular manifold 24, the pressure of the coolant will push the pusher plate 73 upward because the pusher plate 73 closes the channel between the annular manifold 24 and the flow passage 21. At this time, the pusher plate 73 and the inner wall of the opening groove 7 begin to separate, and the liquid flows out into the annular manifold 24. At the same time, the movable paddle plate 71 extends out of the opening groove 7 under the drive of the pusher plate 73, so that the movable paddle plate 71 rotates in the annular manifold 24. The annular manifold 24 is filled with coolant, and the liquid generates resistance to the movable paddle plate 71, thereby helping to reduce the speed of the connecting shaft 11, cooling it down and improving the braking performance.

[0022] In one embodiment, the upper opening of the slot 7 containing the movable paddle plate 71 is provided with inwardly tapered arc plates 8 on both sides. The inwardly tapered arc plates 8 are not in contact with the movable paddle plate 71, thereby reducing the connection between the slot 7 and the annular confluence cavity 24. The inner wall of the flow passage cavity 21 near the movable paddle plate 71 is provided with a baffle plate 81 extending towards the axis of the connecting shaft 11. One end of the pushed arc plate 73 is movably abutted against the outer wall of the baffle plate 81, so that the coolant flowing in the flow passage cavity 21 will completely push the pushed arc plate 73 when it flows through the slot 7. The inwardly tapered arc plates 8 cooperate to reduce the liquid flow opening at the upper part of the slot 7, thereby increasing the liquid pressure in the slot 7. This allows the movable paddle plate 71 to be pushed out of the slot 7 more efficiently during braking, so as to quickly cooperate for braking.

[0023] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A braking device for a wind power generation set, comprising a mounting base plate (1), a connecting shaft (11) bearing-mounted on the mounting base plate (1) and coaxial with the gearbox and the generator for rotation, a brake disc (12) provided on the connecting shaft (11), and brake pads (13) cooperatively provided at the outer end of the brake disc (12), characterized in that: A liquid storage tank (2) for storing coolant is provided on the mounting base plate (1), and a pump body unit for pumping the coolant is provided on the liquid storage tank (2). A plurality of flow-through cavities (21) are uniformly formed inside the connecting shaft (11), and both ends of the flow-through cavities (21) are respectively connected to the pump body unit and the liquid storage tank (2) in common to form a liquid circuit; An installation frame (22) is further provided on the mounting base plate (1). A conversion unit for converting the power of the connecting shaft (11) into the pumping power of the pump body unit and a triggering unit located between the brake pads (13) and the conversion unit are provided on the installation frame (22). The triggering unit is used to form a transmission between the conversion unit and the connecting shaft (11) when the brake pads (13) generate braking.

2. The braking device for a wind turbine generator according to claim 1, characterized in that: The brake discs (12) are symmetrically arranged in two groups on both sides of the connecting shaft (11). Two semi-closed disc covers (23) are fixedly provided on the mounting base plate (1). The two disc covers (23) are respectively in movable abutment with the two brake discs (12) to form an annular confluence cavity (24) communicating with the flow-through cavities (21); The pump body unit includes a piston cylinder (3) provided on the liquid storage tank (2), a piston plate (31) slidingly sealed inside the piston cylinder (3), and two one-way valves (32) provided on the piston cylinder (3) and communicating with its interior. One of the one-way valves (32) is respectively connected to the liquid storage tank (2) and one of the annular confluence cavities (24) through pipes, so that the liquid storage tank (2) supplies liquid to the piston cylinder (3) unidirectionally, and the piston cylinder (3) supplies liquid to the flow-through cavities (21) unidirectionally; The annular confluence cavity (24) not connected to the one-way valve (32) is connected to the liquid storage tank (2) through a pipe.

3. The braking device for a wind turbine generator according to claim 2, characterized in that: There are two groups of the installation frames (22), and a groove (4) in a "U" shape is provided at the upper end. The conversion unit includes a support plate (41) clamped and slidingly limited up and down in the groove (4), a reciprocating threaded rod (42) fixed between the two support plates (41), a threaded rod sleeve (43) sleeved on the reciprocating threaded rod (42), and a connecting rod (44) provided between the threaded rod sleeve (43) and the piston plate (31) and movably passing through the outer wall of the piston cylinder (3); The surfaces of the connecting shaft (11) and the threaded rod sleeve (43) are provided with meshing tooth surfaces, and the tooth surface on the connecting shaft (11) has the same length as the reciprocating threaded rod (42).

4. The braking device for a wind turbine generator according to claim 3, characterized in that: A first spring (5) is further provided between the support plate (41) and the bottom surface of the groove (4), so that the tooth surfaces of the threaded rod sleeve (43) and the connecting shaft (11) are not meshed in the normal state. Annular grooves (51) for the end portions of the connecting rod (44) to be clamped and slid are provided on both sides of the threaded rod sleeve (43), and one end of the first spring (5) away from the annular groove (51) is rotatably connected to the piston plate (31).

5. The braking device for a wind turbine generator according to claim 4, characterized in that: The triggering unit includes a rocker plate (6) hinged to the middle section on the mounting frame (22), a top pressure plate (61) located at the end of the rocker plate (6) and movably abutting against the upper surface of the support plate (41), a rear rod (62) located at the end of the rocker plate (6) away from the top pressure plate (61), and a push arm (63) located on the brake pad (13). The end of the push arm (63) away from the brake pad (13) is configured as a wedge-shaped surface that movably abuts against the rear rod (62), so that when the brake pad (13) is braked, the push arm (63) will abut against the rear rod (62) and rise.

6. The braking device for a wind turbine generator according to any one of claims 2-5, characterized in that: The flow passage cavity (21) is connected to the annular confluence cavity (24) through inverted trapezoidal openings (7) on the connecting shaft (11). A movable paddle plate (71) is provided in the opening slot (7) on the same side as the disc cover (23) connected to the liquid storage tank (2). The movable paddle plate (71) is provided with limiting rods (72) on both sides, which are fixed to the side walls of the opening slot (7), so that the movable paddle plate (71) is limited to sliding radially along the connecting shaft (11). The bottom of the movable paddle plate (71) is provided with a push-receiving arc plate (73) that moves against the inner wall of the opening slot (7) on both sides. A second spring (74) is provided between the push-receiving arc plate (73) and the bottom wall of the opening slot (7).

7. The braking device for a wind turbine generator according to claim 6, characterized in that: The upper sides of the opening groove (7) that houses the movable paddle plate (71) are also provided with inward-curving plates (8), which reduces the connection between the opening groove (7) and the annular confluence cavity (24), and the inward-curving plates (8) do not fit with the movable paddle plate (71).

8. The braking device for a wind turbine generator according to claim 6, characterized in that: The inner wall of the flow passage cavity (21) near the movable paddle plate (71) is provided with a baffle plate (81) extending toward the axis of the connecting shaft (11), and one end of the pushed arc plate (73) is movably abutted against the outer wall of the baffle plate (81).

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