Yaw brake of wind driven generator

Abstract

The utility model belongs to the technical field of yaw braking, and particularly provides a yaw brake of a wind driven generator, which comprises a first brake disc, a second brake disc and a brake, two groups of brake structures are arranged in the brake, and the two groups of brake structures are respectively matched with the first brake disc and the second brake disc for braking. The yaw brake is provided with a plurality of brake discs and a plurality of brake points, and the problem that an existing yaw brake is poor in braking effect due to the fact that only one brake disc is used is solved. The two brake discs are used, so that the braking force of the yaw brake is not in the same plane, and the braking effect and stability can be better guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of yaw braking, and particularly relates to a yaw brake for a wind turbine generator. Background Art

[0002] Generally, the yaw system of a wind turbine generator consists of a yaw reducer, a yaw bearing, a yaw brake, a yaw brake disc, and an auxiliary yaw hydraulic system, lubrication system, etc. The yaw reducer provides a driving torque for the yaw system, driving the entire wind turbine to achieve functions such as yawing to face the wind. The yaw brake provides a braking torque to prevent the wind turbine from undergoing uncontrolled yaw when the wind speed is too high, and at the same time provides a certain yaw damping torque during cable uncoiling to ensure the stable operation of the wind turbine during cable uncoiling. All components of the yaw system are fixed at the bottom of the base. The yaw brake mainly consists of a housing, a hydraulic cylinder inside the housing, brake friction plates, etc., which cooperate with the brake disc. The main function of the brake is to generate a braking force on the brake friction plates by pushing the hydraulic cylinder inside the housing with hydraulic oil. The role of the friction plate is to convert the thrust into a braking force. The friction coefficient of the friction plate is generally about 0.4, and a thrust of 1N from the hydraulic cylinder can generate a frictional braking force of 0.4N.

[0003] Generally, each brake can generate a thrust of 200KN to 500KN according to different models and sizes. When designing the wind turbine, different models and quantities of brakes are selected according to needs. To ensure stable braking, generally more than 4 yaw brakes are used. However, after long-term use, the braking effect decreases, resulting in insufficient braking effect of the original number of yaw brakes; and multiple yaw brakes rely on the same brake disc, and damage to the brake disc will affect the overall braking effect, resulting in a poor braking effect. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a yaw brake for a wind turbine generator, which is provided with multiple brake discs and multiple braking points to solve the problem of poor braking effect of the existing yaw brake using only one brake disc.

[0005] To solve the above technical problem, the technical solution adopted by the utility model is: a yaw brake for a wind turbine generator, including a first brake disc, a second brake disc, and a brake. Two sets of braking structures are arranged inside the brake, and the two sets of braking structures cooperate with the first brake disc and the second brake disc for braking respectively.

[0006] In a preferred solution, the brake is connected with an adapter seat, and the brake is connected to the wind turbine generator through the adapter seat.

[0007] In a preferred solution, the brake is provided with mounting holes, and the brake is connected to the wind turbine generator through the mounting holes and bolts.

[0008] In a preferred embodiment, the brake includes a second caliper and two first calipers. The two first calipers are located on both sides of the second caliper, and a clamping space is formed between the first caliper and the second caliper.

[0009] On the opposite sides of one of the first calipers and the second caliper, first connection seats are provided. On the opposite sides of the other first caliper and the second caliper, second connection seats are provided. In the first caliper and the second caliper, sliding grooves for the first connection seats or the second connection seats to slide are provided.

[0010] On the opposite sides of the two first connection seats, brake pads are provided for clamping the first brake disc. On the opposite sides of the two second connection seats, brake pads are provided for clamping the second brake disc.

[0011] In a preferred embodiment, on the sides of the first connection seats and the second connection seats away from the brake pads, movable rods are connected. In the first caliper and the second caliper, through holes for the movable rods to pass through are provided. In the first caliper and the second caliper, piston chambers corresponding to the first connection seats and the second connection seats are provided. Pistons are slidably installed in the piston chambers. One end of the movable rod away from the first connection seat or the second connection seat is connected to the piston in the corresponding piston chamber, and the piston chamber is connected to a hydraulic circuit.

[0012] In a preferred embodiment, the piston chamber corresponding to the first connection seat is connected to a first oil passage, and the piston chamber corresponding to the second connection seat is connected to a second oil passage. The first oil passage and the second oil passage respectively control the sliding of the first connection seat and the second connection seat.

[0013] In a preferred embodiment, the first oil passage and the second oil passage are connected to an external oil passage through a three-way valve, and the external oil passage is connected to a hydraulic control system.

[0014] In a preferred embodiment, the piston chamber corresponding to the first connection seat is connected to the first oil passage;

[0015] In the first caliper and the second caliper, sealing chambers are provided. The first oil passage is communicated with the sealing chamber through a through hole. One side of the sealing chamber is communicated with the piston chamber corresponding to the second connection seat through a transfer oil passage. A sealing plug is slidably connected in the sealing chamber. A spring is provided between one end of the sealing plug away from the first oil passage and the end of the sealing chamber. Under normal conditions, under the action of the spring, the sealing plug blocks the end of the sealing chamber close to the first oil passage and the transfer oil passage.

[0016] A yaw brake for a wind turbine provided by the present utility model has the following beneficial effects:

[0017] 1. The number of brakes is guaranteed, and there will be no situation of insufficient quantity or inability to add, thereby ensuring the braking effect.

[0018] 2. By providing two brake discs, the overall braking effect is better, the stability is better, and braking can still be completed even if one of the brake discs is damaged.

[0019] 3. The combination of multiple brake discs and braking structures can adjust the braking mode according to different braking requirements, with better adaptability.

[0020] 4. By using two brake discs, the braking force of this yaw brake is not in the same plane, which can better ensure the braking effect and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0022] Figure 1 is a schematic structural diagram of a yaw brake of the present utility model for a wind turbine;

[0023] Figure 2 is a schematic structural diagram of a yaw brake of the present utility model for a wind turbine;

[0024] Figure 3 is a schematic structural diagram of the brake of the present utility model;

[0025] Figure 4 is a schematic structural diagram of an embodiment of the brake of the present utility model;

[0026] In the figure: the first brake disc 1, the second brake disc 2, the adapter seat 3, the brake 4, the mounting hole 42, the first caliper 401, the second caliper 402, the first connecting seat 403, the first oil circuit 404, the second connecting seat 405, the second oil circuit 406, the movable rod 407, the piston cavity 408, the piston 409, the sealing cavity 411, the sealing plug 412, the spring 413, the adapter oil circuit 414, the brake pad 5, the three-way valve 6, the external oil circuit 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Embodiment 1:

[0028] As Figure 1 and 2 shown, a yaw brake for a wind turbine includes a first brake disc 1, a second brake disc 2 and a brake 4. Two sets of braking structures are provided inside the brake 4, and the two sets of braking structures cooperate with the first brake disc 1 and the second brake disc 2 for braking respectively.

[0029] By using two brake discs, the braking force of this yaw brake is not in the same plane, which can better ensure the braking effect and stability. The two sets of braking structures can be controlled separately and can adapt to different braking requirements. For example, it can meet the small braking force braking when using a single braking structure, or the large braking force braking when using the two sets of braking structures simultaneously.

[0030] In this embodiment, as Figure 3As shown, the brake 4 includes a second caliper 402 and two first calipers 401. The two first calipers 401 are located on both sides of the second caliper 402. A clamping space is formed between the first caliper 401 and the second caliper 402. The two formed clamping spaces respectively accommodate the first brake disc 1 and the second brake disc 2.

[0031] On the opposite side of one of the first calipers 401 and the second caliper 402, a first connecting seat 403 is provided. On the opposite side of the other first caliper 401 and the second caliper 402, a second connecting seat 405 is provided. Sliding grooves for the first connecting seat 403 or the second connecting seat 405 to slide are provided in both the first caliper 401 and the second caliper 402.

[0032] On the opposite sides of the two first connecting seats 403, brake pads 5 are provided for clamping the first brake disc 1. On the opposite sides of the two second connecting seats 405, brake pads 5 are provided for clamping the second brake disc 2.

[0033] The two sets of first connecting seats 403 and the brake pads 5 on their opposite sides are the first set of braking structures. The two sets of second connecting seats 405 and the brake pads 5 on their opposite sides are the second set of braking structures, that is, the above two sets of braking structures. One braking is completed by clamping the first brake disc 1 through the first connecting seat 403 and its corresponding brake pad 5, and the second braking is completed by clamping the second brake disc 2 through the second connecting seat 405 and its corresponding brake pad 5.

[0034] In a preferred solution, movable rods 407 are connected to the sides of the first connecting seat 403 and the second connecting seat 405 away from the brake pads 5. Through holes for the movable rods 407 to pass through are provided in the first caliper 401 and the second caliper 402. Piston chambers 408 corresponding to the first connecting seat 403 and the second connecting seat 405 are provided in the first caliper 401 and the second caliper 402. Pistons 409 are slidably installed in the piston chambers 408. One end of the movable rod 407 away from the first connecting seat 403 or the second connecting seat 405 is connected to the piston 409 in the corresponding piston chamber 408. The piston chamber 408 is connected to a hydraulic circuit.

[0035] During use, hydraulic oil enters the piston chamber 408 through the hydraulic circuit, and then the hydraulic circuit is pressurized through the prior art. The hydraulic pressure acting on the piston 409 will push the piston 409, thereby pushing the first connecting seat 403 or the second connecting seat 405 connected to the piston 409 to move, which can drive the brake pads 5 to closely adhere to the first brake disc 1 or the second brake disc 2, thereby converting the hydraulic pressure into braking force to complete braking.

[0036] In a further embodiment, as Figure 3As shown, the piston chamber 408 corresponding to the first connection seat 403 is connected to a first oil passage 404, and the piston chamber 408 corresponding to the second connection seat 405 is connected to a second oil passage 406. The first oil passage 404 and the second oil passage 406 respectively control the sliding of the first connection seat 403 and the second connection seat 405.

[0037] The sliding grooves corresponding to the first connection seat 403 and the second connection seat 405 are respectively connected to different hydraulic circuits, so that they can be respectively controlled by an existing hydraulic system to adapt to different braking situations. And when one braking position fails, it will not affect the other braking position, avoiding the situation of inability to brake.

[0038] In a preferred solution, the first oil passage 404 and the second oil passage 406 are connected to an external oil passage 7 through a three-way valve 6. The external oil passage 7 is connected to a hydraulic control system of the prior art. The prior art is used to control the flow of hydraulic pressure and hydraulic oil. The three-way valve 6 is preferably a three-way solenoid valve. The circuit for directly controlling the flow of hydraulic oil through the three-way valve 6 is more convenient to control and more convenient to connect.

[0039] Embodiment 2:

[0040] As Figure 4 shown, the piston chamber 408 corresponding to the first connection seat 403 is connected to the first oil passage 404; sealing chambers 411 are provided in both the first caliper 401 and the second caliper 402. The first oil passage 404 is communicated with the sealing chamber 411 through a through hole. One side of the sealing chamber 411 is communicated with the piston chamber 408 corresponding to the second connection seat 405 through a transfer oil passage 414. A sealing plug 412 is slidably connected in the sealing chamber 411. A spring 413 is provided between the end of the sealing plug 412 away from the first oil passage 404 and the end of the sealing chamber 411. Under normal conditions, under the action of the spring 413, the sealing plug 412 seals the end of the sealing chamber 411 close to the first oil passage 404 and the transfer oil passage 414.

[0041] In this embodiment, only one oil passage is needed to connect the hydraulic control system, and there are fewer connecting pipelines between the hydraulic control system and the brake 4, so it is more convenient when laying out the hydraulic pipelines.

[0042] When a large braking force is not required, the hydraulic oil fed into the first oil passage 404 only generates the required hydraulic pressure. When a large braking force is needed, the hydraulic pressure increases, and its pressure is greater than the elastic force of the spring 413, which can then push the sealing plug 412 to move, so that the transfer oil passage 414 is no longer blocked by the sealing plug 412, and the hydraulic oil can enter the transfer oil passage 414, enabling the hydraulic pressure to act on the second connecting seat 405. Furthermore, the first connecting seat 403 and the second connecting seat 405 can work simultaneously to form a large braking force to meet the braking requirements. Usually, only the first connecting seat 403 works, avoiding waste of brake materials. According to needs, the brake pads 5 connected to the first connecting seat 403 can be made thicker.

[0043] In this embodiment, the first oil passage 404, the second oil passage 406, the transfer oil passage 414, and the external oil passage 7 of the present application all have complete oil inlet and outlet pipelines, and the specific oil inlet and outlet methods can adopt the existing technologies.

[0044] Embodiment 3:

[0045] As Figure 1 and 2 shown, the brake 4 is connected with a transfer seat 3. When in use, the brake 4 is connected to the wind turbine through the transfer seat 3, which can provide more connection space. For example, the transfer seat 3 is set in a T shape, with the narrower end connected to the wind turbine and the wider end connected to multiple brakes 4, enabling more brakes 4 to be connected in an environment with limited connection positions for the brakes 4, and thus connecting more brakes 4 to ensure a sufficient number of brakes 4 and make the overall braking effect better.

[0046] In a preferred solution, an installation hole 42 is provided in the brake 4. When in use, the brake 4 is connected to the wind turbine through the installation hole 42 and bolts, or is connected to the transfer seat 3 through the installation hole 42 and bolts.

[0047] According to needs, first directly connect the brake 4 to the wind turbine, and then use the brake 4 to connect to the transfer seat 3. Four brake discs are provided, with two brake discs cooperating with the direct brake 4 and the other two brake discs cooperating with the brake 4 connected to the transfer seat 3, so as to facilitate the setting of multiple brakes 4 and ensure the braking effect.

[0048] The above embodiments are only the preferred technical solutions of the present utility model and should not be regarded as limitations to the present utility model. The embodiments and the features in the embodiments in the present application can be arbitrarily combined with each other without conflict. The protection scope of the present utility model should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present utility model.

Claims

1. A yaw brake for a wind turbine, characterized in that: It includes a first brake disc (1), a second brake disc (2) and a brake (4). Two sets of braking structures are arranged inside the brake (4), and the two sets of braking structures cooperate with the first brake disc (1) and the second brake disc (2) respectively for braking.

2. The yaw brake of a wind turbine according to claim 1, wherein: The brake (4) is connected with an adapter seat (3), and the brake (4) is connected with a wind turbine through the adapter seat (3).

3. The yaw brake of a wind turbine according to claim 1, characterized in that: An installation hole (42) is arranged inside the brake (4), and the brake (4) is connected with a wind turbine through the installation hole (42) and bolts.

4. The yaw brake of a wind turbine according to claim 1, wherein: The brake (4) includes a second caliper (402) and two first calipers (401). The two first calipers (401) are located on both sides of the second caliper (402), and a clamping space is formed between the first caliper (401) and the second caliper (402); First connection seats (403) are arranged on the opposite sides of one of the first calipers (401) and the second caliper (402), and second connection seats (405) are arranged on the opposite sides of the other first caliper (401) and the second caliper (402). Sliding grooves for the first connection seats (403) or the second connection seats (405) to slide are arranged inside the first caliper (401) and the second caliper (402); Brake pads (5) are arranged on the opposite sides of the two first connection seats (403) for clamping the first brake disc (1), and brake pads (5) are arranged on the opposite sides of the two second connection seats (405) for clamping the second brake disc (2).

5. The yaw brake of a wind turbine according to claim 4, characterized in that: Moving rods (407) are connected to the sides of the first connection seats (403) and the second connection seats (405) far away from the brake pads (5). Through holes for the moving rods (407) to pass through are arranged inside the first caliper (401) and the second caliper (402). Piston chambers (408) corresponding to the first connection seats (403) and the second connection seats (405) are arranged inside the first caliper (401) and the second caliper (402). Pistons (409) are slidably installed inside the piston chambers (408). One end of the moving rod (407) far away from the first connection seat (403) or the second connection seat (405) is connected to the piston (409) inside the corresponding piston chamber (408), and the piston chamber (408) is connected to a hydraulic circuit.

6. The yaw brake of a wind turbine according to claim 5, characterized in that: The piston chamber (408) corresponding to the first connection seat (403) is connected with a first oil circuit (404), and the piston chamber (408) corresponding to the second connection seat (405) is connected with a second oil circuit (406). The first oil circuit (404) and the second oil circuit (406) control the sliding of the first connection seat (403) and the second connection seat (405) respectively.

7. The yaw brake of a wind turbine according to claim 6, characterized in that: The first oil circuit (404) and the second oil circuit (406) are connected to an external oil circuit (7) through a three-way valve (6), and the external oil circuit (7) is connected to a hydraulic control system.

8. The yaw brake of a wind turbine according to claim 5, characterized in that: The piston chamber (408) corresponding to the first connection seat (403) is connected with a first oil circuit (404); A sealing cavity (411) is provided in both the first caliper (401) and the second caliper (402). The first oil passage (404) is communicated with the sealing cavity (411) through a through hole. One side of the sealing cavity (411) is communicated with the corresponding piston cavity (408) of the second connecting seat (405) through a transfer oil passage (414). A sealing plug (412) is slidably connected in the sealing cavity (411). A spring (413) is provided between the end of the sealing plug (412) far from the first oil passage (404) and the end of the sealing cavity (411). Under normal conditions, under the action of the spring (413), the sealing plug (412) blocks the end of the sealing cavity (411) close to the first oil passage (404) and the transfer oil passage (414).

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