Protective braking device of wind driven generator

Abstract

The invention discloses a protective braking device of a wind driven generator, and relates to the technical field of wind power generation equipment, the protective braking device of the wind driven generator is characterized by comprising blades and a case, and further comprising a generator, a speed change mechanism and a braking control mechanism which are arranged in the case, and the generator is arranged on a base with a bearing part of a hollow structure; wherein the speed change mechanism comprises a gearbox a and a gearbox b which are in meshed transmission, and one end of the gearbox a is connected with the paddle through a shaft rod a with a gear a. According to the protective braking device for the generator, through mutual conversion among the rotating speed of the generator, the gas flow and the flow velocity, and by utilizing the characteristics of gas at different flows and flow velocities, heat dissipation and cooling of the generator, control over the gas flow direction and braking of the rotating speed of the generator are achieved; therefore, the generator is automatically and circularly switched between self heat dissipation protection and speed limiting protection, and the protection of the generator is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation equipment, and more specifically, to a protective braking device for a wind power generator. Background Art

[0002] A wind turbine is an electrical device that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. The blades rotate under the action of wind force, which converts the kinetic energy of the wind into the mechanical energy of the wind rotor shaft. The generator rotates under the drive of the wind rotor shaft to generate electricity. At present, the protection of wind turbines is mainly reflected in how to avoid correlation problems caused by excessive rotation speed of the wind rotor shaft, which increases the operating load of the generator. In the process of conventional wind power generation, the controllability of the wind rotor shaft speed is mainly achieved by automatic monitoring of the wind rotor shaft speed and disc mechanical braking. Although this method can achieve the purpose of limiting the speed of the wind rotor shaft, this control form requires the use of different types of equipment to achieve it. On the one hand, the number of equipment involved is large, and on the other hand, the operation process is more complicated. Moreover, this type of control adopts an operation mode of monitoring first and then braking. If there is a power outage or a failure in the monitoring equipment, the braking equipment will not be able to operate.

[0003] Therefore, in order to solve the above technical problems, the present application proposes a protective braking device for a wind turbine generator. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a protective braking device for a wind turbine generator.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a protective braking device for a wind turbine generator, comprising blades and a chassis, and also comprising a generator, a speed change mechanism and a brake control mechanism arranged inside the chassis, wherein the generator is arranged on a base with a hollow structure of a load-bearing portion; wherein the speed change mechanism comprises two groups of gearboxes a and gearboxes b in meshing transmission, one end of the gearbox a is connected to the blades through a shaft a with a gear a, and the gear a is driven by the blades to drive the gear a, and the other end of the gearbox a is connected to the transmission end of the generator through a shaft b with a rotating disk, one end of the gearbox b is provided with a gear b meshing with the gear a and driving the gearbox b, and the other end of the gearbox b is provided with a turbo pump driven by the internal gear of the gearbox b, a shaft body extending to the outside of the turbo pump and having a gear c is provided on the rotating end of the turbine in the turbo pump, and the air inlet port of the turbo pump is connected to the gearbox arranged on the chassis through a pipe body. The medium flow box a is connected to the air intake hood on the box; the brake control mechanism includes a medium flow box a, a medium flow box b and a brake drive box which are arranged in sequence longitudinally and in a connected structure. The medium flow box a is hollow in structure, and one end is connected to the air outlet port of the turbine air pump through a tube body, and the other end is connected to the inside of the base through a drainage hood with a tube body. A flow port b which connects the drainage hood and the inside of the medium flow box a is arranged at the connection between the medium flow box a and the drainage hood. An adjusting member which can be moved by the thrust generated by the air flow inside the medium flow box a and can close the flow port b is arranged inside the medium flow box a at the flow port b. The adjusting member is connected to a cover plate which can control the air flow in the medium flow box b through an elastic rod linkage member arranged on the top side of the medium flow box a. A brake assembly which can be driven by air pressure and brake the rotating disk is arranged on the brake drive box, and a heat dissipation assembly for braking cooling is arranged on the brake assembly.

[0006] Preferably, the medium flow box a is provided with a flow port a and a strip groove on the top side at one end of the drainage cover, and the medium flow box b is provided with a flow port c corresponding to the size and position of the flow port a and an installation groove corresponding to the position of the strip groove, and the flow port c is connected with the brake drive box, and the inner wall of the cavity formed between the flow port c and the brake drive box is provided with a telescopic port that is connected with the installation groove and provides a movable cover plate.

[0007] Preferably, the elastic rod linkage comprises a support rod that slides in a limited position in the strip groove and a spring a that is arranged between the support rod and the strip groove for resetting the support rod. The end opposite to the sliding end of the support rod is embedded in the installation groove until the telescopic opening, and a cover plate is provided on the end to control the flow of air in the circulation port c through the telescopic opening.

[0008] Preferably, the adjusting member includes an adjusting plate that can cover the flow port b and plug rods distributed in a circular shape with the center of the adjusting plate on the end surface facing the flow port b. The flow port b is located on the end surface inside the medium flow box a and is provided with slots corresponding to multiple groups of plug rods. The slots located at the top of the flow port b are connected to the strip grooves, and the plug rods located at the top of the adjusting plate pass through the slots at the top of the flow port b to be connected to the support rods.

[0009] Preferably, the brake assembly includes a driving assembly arranged in a brake drive box and a brake disc corresponding to the position of the rotating disc; wherein the driving assembly includes a fixed disc fixed on the inner wall of the brake drive box, a driving disc that can be pushed by air pressure, and a spring b arranged between the driving disc and the fixed disc, and the driving disc and the space in the brake drive box beside it can form an air cavity for gas to enter; the brake disc, corresponding to the disc body position of the bottom side of the rotating disc, has a shaft c at the center of the inner end face that passes through the brake drive box and the fixed disc in sequence and is connected to the driving disc.

[0010] Preferably, the heat dissipation assembly includes a rotating sleeve located outside the brake drive box and nested on the shaft c, and a gear d and fan blades arranged on the rotating sleeve. The rotating sleeve is limited to rotate on the shaft c, the gear d corresponds to the position of the gear c, and a reserved gap is provided between the gear d and the fan blades for the gear c to intervene in the rotation.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses the rotation speed of the blades themselves as the basis for judgment. The blades at different speeds will directly affect the rotation speed of the turbine in the turbine pump on the gearbox b. The flow rate and flow rate of the gas introduced into the medium flow box a by turbines with different rotation speeds are different. The thrust and air pressure generated by the gas at different flow rates and flow rates are different. At the same time, the adjustment parts are used to effectively change the flow direction of the gas, so that when the blade speed is normal, the gas flows into the base to provide heat dissipation and cooling for the generator. When the blade speed is too fast, the gas flows into the brake drive box, and the pressure generated by the gas drives the brake assembly to move, thereby achieving the braking effect. When the blade speed returns to normal, the gas is in a state of dissipating heat for the generator. Therefore, in this way, the generator forms an automatic and cyclic switching between its own heat dissipation protection and speed limit protection, thereby ensuring the real-time and comprehensive protection of the generator.

[0012] 2. The protective braking device for the generator in the present invention mainly converts between the generator speed and the gas flow rate and velocity, and utilizes the characteristics of the gas at different flow rates and velocities to achieve heat dissipation and cooling of the generator, control of the gas flow direction, and braking of the generator speed, thereby effectively improving the functionality and practicality of the device. At the same time, the device does not require the aid of automated control equipment, thus avoiding the complexity of the operating process and also avoiding the problem of the braking device being unable to operate due to power outages, failures, and other factors of the automated equipment.

[0013] 3. The brake assembly in the present invention is provided with a heat dissipation assembly for providing cooling during braking. During the movement of the brake assembly, the fan blades of the heat dissipation assembly will rotate on the brake assembly through the intervention of the meshing transmission. When the brake disc of the brake assembly contacts the rotating disc connected to the generator shaft b, the fan blades can effectively reduce the heat conduction effect caused by the friction between the disc bodies, and also effectively slow down the aging of the rotating disc and the brake disc due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is an overall structural diagram of the connection between the blades and the chassis in the present invention; Figure 2 This is the overall structure diagram of the internal chassis of the present invention; Figure 3 It is a partial diagram of the overall structure inside the chassis of the present invention; Figure 4 For the present invention, the structure of the medium flow box a; Figure 5 A partial structural diagram of the medium flow box a of the present invention; Figure 6 A top view of the medium flow box a in the present invention; Figure 7 It is a connection diagram between the adjustment plate, the support rod and the cover plate in the present invention; Figure 8 For the present invention Figure 7 A magnified image of point A; Fig. 9 This is a bottom structural diagram of the medium flow box b in the present invention; Fig.10 It is a top structural diagram of the medium flow box b in the present invention; Fig.11 It is a connection diagram of the brake assembly and the brake drive box in the present invention; Fig.12 is a disassembled diagram of the brake assembly in the present invention; Fig.13 It is a structural diagram of the base in the present invention; Fig.14 It is a flow diagram of gas when the adjustment plate is in an unclosed state in the present invention; Fig.15 This is a gas flow diagram when the adjustment plate is in a closed state in the present invention.

[0015] 1. Paddle blades; 2. Chassis; 3. Generator; 4. Machine base; 5. Speed ​​change mechanism; 501. Gearbox a; 502. Gearbox b; 503. Gear a; 504. Shaft a; 505. Gear b; 6. Braking control mechanism; 7. Axle rod b; 8. Turn the plate; 9. Turbine air pump; 10. Air intake hood; 11. medium flow box a; 1101. flow port a; 1102. strip groove; 1103. adjustment plate; 1104. support rod; 1105. cover plate; 1106. flow port b; 1107. spring a; 1108. plug rod; 12. medium flow box b; 1201. flow port c; 1202. mounting slot; 1203. telescopic port; 13. brake drive box; 1301. air cavity; 14. Gear c; 15. Brake assembly; 16. driving assembly; 1601. driving disk; 1602. fixing disk; 1603. spring b; 17. heat dissipation component; 1701. gear d; 1702. fan blade; 18. brake disc; 1801. shaft c; 19. Drainage hood. DETAILED DESCRIPTION

[0016] like Figure 1-15 As shown, the present invention provides a wind turbine protective brake device, including a blade 1 and a chassis 2, and also includes a generator 3, a speed change mechanism 5 and a brake control mechanism 6 arranged inside the chassis 2. Fig.13 As shown, the generator 3 is arranged on a base 4 whose bearing part is a hollow structure; like Figure 1 , Figure 2 and Figure 3As shown, the speed change mechanism 5 includes two groups of gearboxes a501 and b502 in meshing transmission. One end of the gearbox a501 is connected to the blade 1 through a shaft a504 with a gear a503, and the gearbox a503 is driven by the blade 1 to drive the gearbox a501. The other end of the gearbox a501 is connected to the transmission end of the generator 3 through a shaft b7 with a rotating disk 8. One end of the gearbox b502 is provided with a gear b505 meshing with the gear a503 and driving the gearbox b502. The other end of the gearbox b502 is provided with a turbo pump 9 driven by the internal gear of the gearbox b502. The rotating end of the turbine in the turbo pump 9 is provided with a shaft body extending to the outside of the turbo pump 9 and having a gear c14. The air inlet port of the turbo pump 9 is connected with the air inlet cover 10 provided on the chassis 2 through a pipe body. Further explained, the speed change mechanism 5 mainly realizes the speed regulation during the transmission process of the blade 1, and the gearbox a501 and the gearbox b502 are both realized by multi-stage speed change with different gear ratios. The driving end of the gearbox a501 will be connected to the gear a503, and the blade 1 drives the gearbox a501 by driving the shaft a504, and the gear a503 realizes the driving of the gearbox a501. After the gearbox a501 changes speed, the gear at the driving end will transmit the shaft b7, and the generator 3 intervenes through the rotation of the shaft b7, thereby achieving the effect of power generation; The drive based on the gearbox b502 is realized by the meshing of the gear b505 and the gear a503. The turbine in the turbo pump 9 is driven by the speed change of the gearbox b502, so that the turbo pump 9 is in operation; like Figure 1 , Figure 2 and Figure 3 As shown, the brake control mechanism 6 includes a medium flow box a11, a medium flow box b12 and a brake drive box 13 which are arranged in sequence longitudinally and in a connected structure. The medium flow box a11 is hollow in structure, and one end is connected to the outlet port of the turbine air pump 9 through a pipe body, and the other end is connected to the inside of the base 4 through a drainage cover 19 with a pipe body. The connection between the medium flow box a11 and the drainage cover 19 is provided with a flow port b1106 which connects the drainage cover 19 with the inside of the medium flow box a11. The inside of the medium flow box a11 is located The flow port b1106 is provided with an adjusting member that can be moved by the thrust generated by the air flow inside the medium flow box a11 and can close the flow port b1106. The adjusting member is connected to the cover plate 1105 that can control the air flow inside the medium flow box b12 through an elastic rod linkage member provided on the top side of the medium flow box a11. The brake drive box 13 is provided with a brake assembly 15 that can be driven by air pressure and brake the rotating disk 8. The brake assembly 15 is provided with a heat dissipation assembly 17 for braking and cooling. Specifically, the brake control mechanism 6 mainly realizes the brake control of the rotation speed of the generator 3 by introducing gas through the turbo pump 9, that is, speed limit protection. The medium flow box a11 is actually the flow control part of the gas, and the control of the gas flow needs to be determined according to the thrust generated by the amount of introduced gas and the flow rate, which is specifically embodied as follows: For example, the speed protection value of blade 1 is set to m. When the speed of blade 1 is less than m, it belongs to the normal speed range. The gearbox b502 drives the turbo pump 9 to operate. The amount of gas and the flow rate introduced into the medium flow box a11 by the turbo pump 9 are set to n. In the n state, the thrust generated will not be enough to drive the adjustment plate 1103 to move, and the adjustment plate 1103 cannot be moved to the flow port b1106 to achieve the effect of sealing the flow port b1106. At this time, the cover plate 1105 in the medium flow box b12 will be in a closed state. Fig.14 As shown, the gas will not be able to enter the brake drive box 13. At this time, the gas will flow into the gap between the adjustment plate 1103 and the flow port b1106, and will be introduced into the base 4 through the flow port b1106. Through the hollow top structure, the generator 3 is provided with a heat dissipation effect. The above-mentioned gas flow rate and flow velocity are proportional to each other, and are both key factors that directly affect the gas thrust. Therefore, the gas flow rate and flow velocity are recorded as a variable n; When the speed of blade 1 = m, it is in a state of too fast speed, and gearbox b502 drives turbo pump 9 to run. The amount of gas introduced into medium flow box a11 by turbo pump 9 increases and the flow rate becomes faster. The thrust generated can move the adjustment plate 1103 to the flow port b1106 to close the flow port b1106. While the flow port b1106 is closed, the plug rod 1108 at the top of the adjustment plate 1103 drives the cover plate 1105 in the medium flow box b12 to move under the action of the elastic rod linkage, so that the cover plate 1105 is in an open state, such as Fig.15 As shown, the gas will enter the brake drive box 13. At this time, the medium flow box a11, the medium flow box b12 and the brake drive box 13 are connected. After the gas enters the air cavity 1301 of the brake drive box 13, the air pressure will increase, so that the brake assembly 15 is driven by the air pressure to move until the brake disc 18 on the brake assembly 15 contacts the rotating disc 8, and the friction is used to achieve the effect of reducing the speed of the shaft b7. However, when the shaft b7 slows down, the blade 1 will also slow down through the gearbox a501. At the same time, the gearbox b502 will also slow down due to the gear a503, affecting the rotation speed of the turbine of the turbo pump 9. After the turbo pump 9 slows down, the gas flow rate and flow rate will both decrease. The regulating plate 1103 will be reset with the help of the spring a1107 on the support rod 1104, and the cover plate 1105 will close the gas flow of the medium flow box b12 again, and the gas will provide heat dissipation for the generator 3. In order to achieve the connection between the medium flow box a11, the medium flow box b12 and the brake drive box 13 and facilitate the installation of the elastic rod linkage on the medium flow box a11 and the medium flow box b12, as shown in FIG. Figure 4-Figure 10 As shown, the medium flow box a11 is provided with a flow port a1101 and a strip groove 1102 on the top side of one end of the drainage cover 19, and the medium flow box b12 is provided with a flow port c1201 corresponding to the size and position of the flow port a1101 and a mounting groove 1202 corresponding to the position of the strip groove 1102, the flow port c1201 is in a communication structure with the brake drive box 13, and the inner wall of the cavity formed between the flow port c1201 and the brake drive box 13 is provided with a telescopic port 1203 that is in communication with the mounting groove 1202 and provides a movable cover plate 1105; In order to achieve the correlation control of the flow direction of the gas in the medium flow box a11 and the medium flow box b12 without affecting the gas flow, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the elastic rod linkage member includes a support rod 1104 that slides within the strip groove 1102 and a spring a1107 that is arranged between the support rod 1104 and the strip groove 1102 and is used to reset the support rod 1104. The end of the support rod 1104 opposite to the sliding end is embedded in the installation groove 1202 until it reaches the telescopic opening 1203, and a cover plate 1105 is arranged on the end to control the air flow in the circulation opening c1201 through the telescopic opening 1203; Specifically, since the medium flow box a11, the medium flow box b12 and the brake drive box 13 are connected, in order to achieve the heat dissipation of the generator 3 and the braking effect on the rotation speed of the generator 3 under different gas flow rates and flow rates, it is necessary to control the flow direction of the gas accordingly. Based on the different positions of the flow port b1106 and the flow port c1201, a support rod 1104 is set to drive the adjustment plate 1103 and the cover plate 1105 to move synchronously. The movement of the support rod 1104 is used to drive the adjustment plate 1103 and the cover plate 1105 to open and close in coordination, thereby solving the problem of the flow direction of the gas flowing into the drainage cover 19 or the brake drive box 13. Different flow directions have different effects on the gas. At the same time, the flow direction of the gas needs to be determined according to the engine speed. Therefore, the effect produced is that when the speed reaches a predetermined speed, the gas will drive the brake assembly 15 through the characteristics of the air pressure, and when the speed is less than the predetermined speed, the gas will provide heat dissipation for the generator 3. In order to achieve the best effect of gas flow control, such as Figure 6 , Figure 7 and Figure 8As shown, the adjusting member includes an adjusting plate 1103 that can cover the flow port b1106 and plug rods 1108 that are distributed in a circular manner on the end surface of the flow port b1106 with the center of the adjusting plate 1103, and the flow port b1106 is located on the end surface of the medium flow box a11 and is provided with slots corresponding to multiple groups of plug rods 1108, the slots located at the top of the flow port b1106 are connected to the strip groove 1102, and the plug rod 1108 located at the top of the adjusting plate 1103 passes through the slots at the top of the flow port b1106 to be connected to the support rod 1104; Furthermore, the regulating member adopts a plate-type multi-rod 1108 structure, which can improve the stability of the overall movement of the regulating plate 1103 when the gas flow rate and flow velocity are large, and also increase the contact area with the gas. At the same time, the plate-type structure can also comprehensively cover the flow port b1106 to enhance the sealing performance. A rubber sealing strip to enhance the sealing performance can also be added to the closed end surface of the regulating plate 1103; The brake assembly 15 includes a drive assembly 16 disposed in the brake drive box 13 and a brake disc 18 corresponding to the position of the rotating disc 8. The drive assembly 16 includes a fixed disc 1602 fixed on the inner wall of the brake drive box 13, a drive disc 1601 that can be pushed by air pressure, and a spring b1603 disposed between the drive disc 1601 and the fixed disc 1602. The drive disc 1601 and the space in the brake drive box 13 beside it can form an air cavity 1301 for gas to enter; the brake disc 18 corresponds to the disc body position of the bottom side of the rotating disc 8, and a shaft c1801 that passes through the brake drive box 13 and the fixed disc 1602 in sequence and is connected to the drive disc 1601 is disposed at the center of the inner end surface; Specifically, the brake assembly 15 is driven mainly by the air pressure generated by the gas flow. After the gas enters the air cavity 1301, the air pressure in the brake drive box 13 increases, and the air pressure is used to drive the drive disk 1601 of the brake assembly 15. When the drive disk 1601 moves, the brake disk 18 is driven to move through the shaft c1801, so that the brake disk 18 contacts the rotating disk 8 at a high speed, and the rotating disk 8 is decelerated by friction. After the deceleration, the turbo air pump 9 also reduces the flow rate and flow velocity of the air. When the adjustment plate 1103 is reset, the cover plate 1105 will also be in an open state, and the pressure in the brake drive box 13 is lost, and the spring b1603 will drive the brake disk 18 to reset; In order to achieve the best braking effect, Fig.11 and Fig.12 As shown, the heat dissipation assembly 17 includes a rotating sleeve located outside the brake drive box 13 and nested on the shaft c1801, and a gear d1701 and a fan blade 1702 arranged on the rotating sleeve. The rotating sleeve is limited to rotate on the shaft c1801, the position of the gear d1701 corresponds to that of the gear c14, and a reserved gap is provided between the gear d1701 and the fan blade 1702 for the gear c14 to intervene in the rotation. Furthermore, the heat dissipation method mainly adopts air cooling, and the driving part is that when the driving component 16 implements braking, the gear c14 connected to the turbine of the turbo pump 9 for synchronous transmission intervenes to drive the fan blade 1702, that is, under normal conditions, the gear c14 will rotate with the turbine of the turbo pump 9, and the gear c14 is in the gap between the gear d1701 and the fan blade 1702 in this state to idle, when the brake component 15 moves and contacts the rotating disk 8, the gear c14 will mesh with the gear d1701, and the fan blade 1702 will rotate, thereby achieving the effect of braking and heat dissipation; In summary, the brake device mainly drives the generator 3 to generate electricity through the blade 1 with the help of the gearbox a501, and also drives the operation of the turbo pump 9 through the gearbox b502. The characteristics of the turbo pump 9 driving the different gas flow and flow velocity, the different thrusts generated and the different air pressures at different speeds determine the gas flow direction and the different effects generated by different flow directions, which are specifically as follows: Under normal circumstances, the blade 1 can drive the generator 3 to generate electricity through the gearbox a501. At the same time, the gearbox a501 will drive the gearbox b502 through meshing. After multi-stage speed change, the gearbox b502 will drive the turbine in the turbo pump 9 to rotate, that is, the operation of the turbo pump 9. When the turbo pump 9 is running, the turbine will also drive the gear c14 connected to the external shaft to rotate synchronously. When the turbo pump 9 is running, the outside air will be introduced into the medium flow box a11. When the gas flowing into the medium flow box a11 is insufficient in flow rate, the thrust generated is also small. At this time, the medium flow box b12 is in a closed state. The gas will flow into the flow port b1106 through the gap generated by the adjustment plate 1103, and flow into the base 4 through the flow port b1106. The gas in the base 4 will flow upward and contact with the generator 3 to achieve the effect of heat dissipation for the generator 3. At the same time, an air drying filter device can be added at the connection between the base 4 and the drainage cover 19 pipe body; When the speed of the blade 1 is too fast and reaches the threshold, the gearbox b502 will increase the turbine speed of the turbo pump 9 through multiple speed changes, thereby increasing the flow rate of the air in the medium flow box a11, thereby increasing the thrust generated by the gas. Under this thrust, the adjustment plate 1103 will be driven to move, thereby closing the flow port b1106, and the elastic rod linkage will drive the cover plate 1105 to move, so as to achieve the connection between the medium flow box b12 and the brake drive box 13, so that the medium flow box a11, the medium flow box b12 and the brake drive box 13 form a connecting cavity as a whole. After the gas enters the brake drive box 13, the air pressure will drive the brake assembly 15 to move, so that the brake disc 18 on the brake assembly 15 contacts the rotating disc 8, and the speed is reduced by friction. At the same time, when the brake assembly 15 moves to the rotating disc 8, the gear c14 will intervene to drive the gear d1701 of the heat dissipation assembly 17, so that the rotating sleeve drives the fan blade 1702 to rotate, thereby achieving the effect of braking and heat dissipation.

[0017] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the invention as shown in the drawings and above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A protective braking device for a wind turbine generator, comprising a blade (1) and a casing (2), characterized in that: It also includes a generator (3), a speed change mechanism (5) and a brake control mechanism (6) arranged inside the chassis (2); the generator (3) is arranged on a base (4) having a hollow structure as a bearing portion; The speed change mechanism (5) comprises two sets of gearboxes a (501) and b (502) in meshing transmission. One end of the gearbox a (501) is connected to the blade (1) via a shaft a (504) with a gear a (503). The gear a (503) is driven by the blade (1) to drive the gear a (503). The other end of the gearbox a (501) is connected to the transmission end of the generator (3) via a shaft b (7) with a rotating disk (8). The gearbox b (502) is connected to the transmission end of the generator (3) via a shaft b (7) with a rotating disk (8). A gear b (505) meshing with gear a (503) and driving gearbox b (502) is provided at one end of the gearbox b (502); a turbine air pump (9) driven by internal gears of the gearbox b (502) is provided at the other end of the gearbox b (502); a shaft extending to the outside of the turbine air pump (9) and having a gear c (14) is provided on the turbine rotating end of the turbine air pump (9); an air intake port of the turbine air pump (9) is connected to an air intake cover (10) provided on the chassis (2) through a pipe body; A brake control mechanism (6) comprises a medium flow box a (11), a medium flow box b (12) and a brake drive box (13) which are arranged in sequence in a longitudinal direction and are in a connected structure. The medium flow box a (11) is hollow in structure and one end is connected to the air outlet port of a turbine air pump (9) through a pipe body, and the other end is connected to the inside of a machine base (4) through a flow hood (19) with a pipe body. A flow port b (1106) is provided at the connection between the medium flow box a (11) and the flow hood (19) for connecting the flow hood (19) and the inside of the medium flow box a (11). An adjusting member is provided at the flow port b (1106) and can be moved by the thrust generated by the air flow inside the medium flow box a (11) and can close the flow port b (1106). The adjusting member is connected to a cover plate (1105) in the medium flow box b (12) and can control the air flow through an elastic rod linkage member provided on the top side of the medium flow box a (11). The brake drive box (13) is provided with a brake assembly (15) that can be driven by air pressure and brake the rotating disk (8). The brake assembly (15) is provided with a heat dissipation assembly (17) for braking and cooling.

2. A wind turbine protective braking device according to claim 1, characterized in that: The medium flow box a (11) is provided with a flow port a (1101) and a strip groove (1102) on the top side of one end of the drainage cover (19); the medium flow box b (12) is provided with a flow port c (1201) corresponding to the size and position of the flow port a (1101) and a mounting groove (1202) corresponding to the position of the strip groove (1102); the flow port c (1201) is in a connected structure with the brake drive box (13); and a telescopic port (1203) is provided on the inner wall of the cavity formed between the flow port c (1201) and the brake drive box (13) and is connected to the mounting groove (1202) and provides a movable cover plate (1105).

3. A wind turbine protective braking device according to claim 2, characterized in that: The elastic rod linkage component comprises a support rod (1104) that slides within the strip groove (1102) and a spring a (1107) that is arranged between the support rod (1104) and the strip groove (1102) and is used to reset the support rod (1104); an end of the support rod (1104) opposite to the sliding end is embedded in the installation groove (1202) until it reaches the telescopic opening (1203); and a cover plate (1105) is arranged on the end to control the flow of air in the flow opening c (1201) through the telescopic opening (1203).

4. A wind turbine protective braking device according to claim 3, characterized in that: The regulating member comprises an regulating plate (1103) capable of covering the circulation port b (1106) and plug rods (1108) distributed in a circular pattern with the center of the regulating plate (1103) on the end surface facing the circulation port b (1106); the circulation port b (1106) is provided with slots corresponding to a plurality of groups of plug rods (1108) on the end surface located inside the medium circulation box a (11); the slots located at the top of the circulation port b (1106) are connected to the strip grooves (1102); the plug rods (1108) located at the top of the regulating plate (1103) penetrate the slots at the top of the circulation port b (1106) and are connected to the support rods (1104).

5. A wind turbine protective braking device according to claim 1, characterized in that: The brake assembly (15) comprises a drive assembly (16) arranged in a brake drive box (13) and a brake disc (18) corresponding to the position of the rotating disc (8); The drive assembly (16) comprises a fixed disk (1602) fixed on the inner wall of the brake drive box (13), a drive disk (1601) that can be pushed by air pressure, and a spring b (1603) arranged between the drive disk (1601) and the fixed disk (1602); the drive disk (1601) and the space in the brake drive box (13) next to it can form an air cavity (1301) into which gas can enter; The brake disc (18) corresponds to the disc body position of the bottom side portion of the rotating disc (8), and a shaft c (1801) is provided at the center of the inner end surface thereof, which passes through the brake drive box (13) and the fixed disc (1602) in sequence and is connected to the drive disc (1601).

6. A wind turbine protective braking device according to claim 5, characterized in that: The heat dissipation component (17) comprises a rotating sleeve located outside the brake drive box (13) and nested on the shaft c (1801), and a gear d (1701) and a fan blade (1702) arranged on the rotating sleeve, the rotating sleeve is limitedly rotated on the shaft c (1801), the position of the gear d (1701) corresponds to that of the gear c (14), and a reserved gap is provided between the gear d (1701) and the fan blade (1702) for the gear c (14) to intervene in the rotation.

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