Electro-hydraulic brake device of yaw system of large wind turbine

Abstract

The invention belongs to the technical field of wind power generation equipment, and particularly relates to an electro-hydraulic brake device of a yaw system of a large wind turbine. The invention provides an electro-hydraulic brake device for a yaw system of a large-scale wind turbine, and aims to solve the problem that a brake device applied to a yaw system of a wind driven generator in the prior art is complex in structure and not easy to maintain. An electro-hydraulic brake device of a yaw system of a large wind turbine comprises an electromagnetic valve component and a brake disc body component, the brake disc body component comprises a brake disc body, an oil cavity is formed in the brake disc body, a piston is connected in the oil cavity in a sliding mode, a brake pad is installed on the piston through a rod piece, and the brake pad is located outside the oil cavity; the scheme that the hydraulic oil pressure is increased through electromagnetic valve driving, and then the hydraulic pressure drives the brake device to be started is adopted, namely, the electro-hydraulic joint control scheme. The problems of system complexity and response delay of a hydraulic system can be solved, enough driving force can be provided, and a normally-closed brake system can be rapidly started.

Description

Technical Field

[0001] This invention belongs to the technical field of wind power generation equipment, specifically relating to an electro-hydraulic brake device for a large wind turbine yaw system. Background Technology

[0002] Against the backdrop of a global energy system transitioning towards low-carbon development and addressing climate change, countries are actively expanding their investments in renewable energy to gradually reduce reliance on fossil fuels and effectively control greenhouse gas emissions. Wind power, with its clean and renewable characteristics, is gradually becoming a crucial technological means to drive energy structure transformation. It not only helps significantly reduce carbon emissions and mitigate global warming but also boasts advantages such as abundant resources and minimal environmental impact. With continuous technological advancements and declining power generation costs, wind power is demonstrating vast development potential and has become one of the key forces driving the green transformation of the global energy system.

[0003] The yaw system is a critical component of wind turbines, essential for coping with changes in wind direction. The braking device, as a core component of the yaw system's operational safety system, plays a crucial role in yaw system positioning and locking, abnormal rotation protection, and emergency braking, effectively preventing unexpected operational situations. Existing braking devices are mostly hydraulic, requiring complex hydraulic systems. A few patents have proposed normally closed, purely electric control solutions, but the electromagnetic force is insufficient, limiting their applicability to some small wind turbine units. In summary, existing braking devices used in wind turbine yaw systems are structurally complex and difficult to maintain. Summary of the Invention

[0004] This invention provides an electro-hydraulic braking device for a large wind turbine yaw system, aiming to solve the problem that the braking devices used in the yaw system of wind turbines in the prior art are complex in structure and difficult to maintain.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An electro-hydraulic braking device for a large wind turbine yaw system includes a solenoid valve component and a brake disc component. The brake disc component includes a brake disc body, an oil chamber is provided inside the brake disc body, a piston is slidably connected inside the oil chamber, a brake pad is mounted on the piston via a rod, the brake pad is located outside the oil chamber, and a brake spring is provided between the brake pad and the brake disc body.

[0007] When the wind turbine is operating normally under a stable wind direction, the brake pads grip the yaw system gear disc under the preload of the brake spring to achieve braking.

[0008] When the wind direction changes, the brake disc assembly releases the yaw system gear before the yaw system. The solenoid valve assembly is energized and uses hydraulic oil to push the piston to overcome the preload of the brake spring, thereby releasing the yaw system gear to achieve yaw.

[0009] After yaw is completed, the solenoid valve component is de-energized, the hydraulic oil pressure drops, and the piston and brake pads move under the elastic force of the brake spring, causing the brake disc component to grip the yaw system gear disc.

[0010] A further improved solution: The solenoid valve component includes an armature and a coil for driving the armature. A push rod is provided on the armature. The solenoid valve component also includes a cavity for storing hydraulic oil. Under the action of electromagnetic force, the armature pressurizes the hydraulic oil in the cavity through the push rod. The hydraulic oil enters the oil cavity through an oil passage and drives the piston.

[0011] Based on the above technical solution, the solenoid valve component operates at a very fast speed. When the coil is energized, the armature moves under electromagnetic force within a short time (typically milliseconds), and the push rod rapidly pressurizes the hydraulic oil. The hydraulic oil then quickly enters the oil chamber through the oil passage to drive the piston. This rapid response capability allows the yaw system to react quickly to sudden changes in wind direction, promptly releasing the brakes to yaw, avoiding problems such as excessive stress on the wind turbine or energy loss due to delayed response.

[0012] A further improvement: The solenoid valve component further includes a current controller, which controls the electromagnetic force applied by the coil to the armature by controlling the current parameters entering the coil.

[0013] Based on the above technical solution: because the current controller can quickly and accurately adjust the current parameters, the armature can respond in a short time, thereby driving the push rod to pressurize or depressurize the hydraulic oil, achieving rapid piston movement. This greatly improves the response speed of the solenoid valve components, enabling the yaw system to quickly release the brake to yaw when the wind direction changes suddenly, or to quickly restore the braking state after yaw is completed. The rapid response speed can reduce energy loss of the wind turbine during wind direction changes, improving power generation efficiency.

[0014] A further improved solution: The brake disc body is provided with a high-pressure oil passage, which is connected to the oil chamber through a branch oil passage. The oil chamber and the branch oil passage correspond one-to-one. The high-pressure oil passage is connected to the cavity. The hydraulic oil pressurized by the push rod enters the oil chamber sequentially through the high-pressure oil passage and the branch oil passage.

[0015] Based on the above technical solution, the precise design of the high-pressure oil passages and branch oil passages ensures that hydraulic oil accurately enters each corresponding oil chamber, thereby precisely controlling the piston movement within each chamber. This makes the braking and release operations of the yaw system more precise and reliable.

[0016] A further improved solution: The solenoid valve component further includes a coil frame, the coil frame being arranged around the armature, and the coil being disposed on the coil frame.

[0017] Based on the above technical solution: because the coil frame provides stable support and positioning for the coil, the coil will not loosen or deform during operation, thus ensuring the stability of the solenoid valve component. The stable coil position and shape ensure the stability of the magnetic field distribution, keeping the electromagnetic force on the armature within a relatively stable range, reducing the instability of the solenoid valve component caused by magnetic field fluctuations.

[0018] A further improved solution: A guide sleeve is provided between the coil frame and the armature, and a solenoid valve housing is also provided outside the coil. One end of the solenoid valve housing is provided with an end cap, and the other end of the solenoid valve housing is provided with a pole shoe. The push rod extends out of the pole shoe, and the pole shoe is provided with a through hole through which the push rod passes.

[0019] Based on the above technical solution, the sealing design of the solenoid valve housing and end cap effectively prevents the ingress of external dust, moisture, and impurities, protecting the cleanliness and normal operation of internal components. This is especially important for solenoid valves operating in harsh environments, such as humid, dusty industrial sites or outdoor environments. Good sealing performance can ensure the long-term stable operation of the solenoid valve and reduce the occurrence of malfunctions.

[0020] A further improvement: The solenoid valve housing is also provided with a plug, which is connected to the current controller.

[0021] Based on the above technical solution, control signals are transmitted via a plug, enabling the solenoid valve to interact with the current controller and achieve intelligent control. The current controller can adjust the solenoid valve's operating status in real time according to actual needs, such as adjusting parameters like flow rate and pressure, thereby improving the system's automation level and operating efficiency.

[0022] A further improved solution: The brake disc body is further provided with a brake disc body cover, and the brake disc body cover is provided with a low-pressure oil passage. The area between the piston and the low-pressure oil passage in the oil chamber is the low-pressure oil chamber. The low-pressure oil passage is connected to the low-pressure oil chamber. The area in the oil chamber opposite to the low-pressure oil chamber is the high-pressure oil chamber. The high-pressure oil chamber is connected to the branch oil passage. The piston is located between the low-pressure oil chamber and the high-pressure oil chamber.

[0023] Based on the above technical solution, the rational arrangement of low-pressure oil channels and branch oil channels optimizes the flow path of hydraulic oil. The low-pressure oil channel provides a smooth passage for hydraulic oil to enter the low-pressure oil chamber, reducing flow resistance and allowing the low-pressure oil chamber to fill quickly. The branch oil channels accurately deliver high-pressure oil to the high-pressure oil chamber, ensuring that the pressure in the high-pressure oil chamber can be established and maintained in a timely manner. This optimized hydraulic oil flow design improves the working efficiency of the hydraulic system, reduces energy loss, and also lowers the probability of hydraulic system failure.

[0024] A further improved solution: The brake disc body is provided with a brake chamber, and the upper and lower sides of the brake chamber are respectively provided with oil chambers. A piston is slidably connected in each oil chamber. The brake pads are respectively installed on the pistons through rods. The brake pads correspond one-to-one with the pistons. A brake spring is provided between the brake pads and the brake disc body.

[0025] Based on the above technical solution, the dual-chamber and piston design makes the application of braking force more uniform and stable. Because the hydraulic systems on both sides can work together, the brake pads and brake discs are subjected to uniform force during braking, avoiding malfunctions or component damage caused by uneven force on one side.

[0026] A further improved solution: The brake disc body is also provided with a lower cover, and the lower cover is provided with a low-pressure oil passage, which is connected to the low-pressure oil chamber located on the lower side of the brake chamber.

[0027] Based on the above technical solution: Since the low-pressure oil passage is located on the lower cover of the brake disc, it is easier to check the patency of the low-pressure oil passage, the quality and quantity of the hydraulic oil, etc., during the maintenance and inspection of the braking system. At the same time, if the low-pressure oil passage is blocked or damaged, it can be repaired and replaced relatively easily, reducing maintenance costs and repair time.

[0028] The beneficial effects of this invention are as follows:

[0029] This invention employs a solenoid valve to increase hydraulic oil pressure, which in turn drives the brake device to open—an electro-hydraulic control scheme. This solves the problems of system complexity and response delay in hydraulic systems while providing sufficient driving force to quickly open normally closed brake systems.

[0030] This invention can be applied to the yaw system of large wind turbines, which greatly simplifies the system structure, reduces manufacturing and maintenance costs, and significantly improves the response of the braking device.

[0031] This invention employs an electro-hydraulic combination approach, resulting in a relatively simple solenoid valve component. This reduces redundant parts in the hydraulic system, making the overall structure more compact and concise. Furthermore, the reduced number of components also reduces potential failure points, requiring fewer parts to be inspected and replaced during maintenance, thus lowering maintenance costs and time.

[0032] This invention utilizes an electro-hydraulic combination, employing hydraulic oil to transmit pressure and generate sufficiently large braking force, making it suitable for large wind turbine generator sets. The hydraulic system can provide significant pressure and torque, meeting the braking requirements of large wind turbine generator yaw systems under various operating conditions, thus improving the applicability and reliability of the device.

[0033] The electro-hydraulic braking device of this invention can respond to control system commands more quickly and accurately during braking and yaw. The solenoid valve component is rapidly energized and de-energized, changing the pressure and flow direction of the hydraulic oil in a short time, thereby achieving rapid release and engagement of the brake pads. Simultaneously, the elastic force of the brake spring provides stable braking force, ensuring reliable braking performance. This rapid and accurate response and stable braking performance contribute to improving the operating efficiency and safety of wind turbines. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For users of ordinary skills in the art, other related drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of an electro-hydraulic brake device for a large wind turbine yaw system according to the present invention.

[0036] Figure 2 This is a schematic diagram of the internal structure of the brake disc component in the electro-hydraulic brake device of a large wind turbine yaw system according to the present invention.

[0037] Figure 3 This is a schematic diagram showing the relative positions of the brake disc component and the solenoid valve component in the electro-hydraulic brake device of a large wind turbine yaw system according to the present invention.

[0038] Figure 4 This is a schematic diagram of the internal structure of the solenoid valve component in the electro-hydraulic brake device of a large wind turbine yaw system according to the present invention.

[0039] Figure 5 This is a rendering of an electro-hydraulic brake device for a large wind turbine yaw system installed on the yaw system according to the present invention.

[0040] Explanation of the labels in the diagram:

[0041] 1-Solenoid valve component; 11-Push rod; 12-Pole shoe; 13-Armature; 14-Coil frame; 15-Guide sleeve; 16-End cap; 17-Solenoid valve housing; 18-Plug; 19-Coil; 2-Brake disc body component; 21-Brake disc upper cover; 22-Brake disc body; 221-High-pressure oil passage; 222-Branch oil passage; 223-Low-pressure oil passage; 224-High-pressure oil chamber; 23-Brake disc lower cover; 24-Piston; 25-Brake spring; 26-Brake pad. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. All other embodiments obtained by users of the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0043] refer to Figures 1 to 5 An electro-hydraulic braking device for a large wind turbine yaw system includes a solenoid valve component 1 and a brake disc component 2. The brake disc component 2 includes a brake disc body 22, an oil chamber is provided inside the brake disc body 22, a piston 24 is slidably connected inside the oil chamber, a brake pad 26 is mounted on the piston 24 via a rod, the brake pad 26 is located outside the oil chamber, and a brake spring 25 is provided between the brake pad 26 and the brake disc body 22.

[0044] When the wind turbine is operating normally under a stable wind direction, the brake pad 26 grips the yaw system gear disc under the preload of the brake spring 25 to achieve braking.

[0045] When the wind direction changes, the brake disc component 2 releases the yaw system gear before the yaw system. The solenoid valve component 1 is energized and pushes the piston 24 through hydraulic oil to overcome the preload of the brake spring 25, thereby releasing the yaw system gear to achieve yaw.

[0046] After yaw is completed, the solenoid valve component 1 is de-energized, the hydraulic oil pressure drops, and the piston 24 and brake pad 26 move under the elastic force of the brake spring 25, causing the brake disc component 2 to grip the yaw system gear disc.

[0047] The solenoid valve component 1 includes an armature 13 and a coil 19 for driving the armature 13. A push rod 11 is mounted on the armature 13. The solenoid valve component 1 also includes a cavity storing hydraulic oil. Under electromagnetic force, the armature 13 pressurizes the hydraulic oil in the cavity through the push rod 11. The hydraulic oil enters the cavity through an oil passage and drives the piston 24. The solenoid valve component 1 also includes a current controller, which controls the electromagnetic force applied by the coil 19 to the armature 13 by controlling the current parameters entering the coil 19. A high-pressure oil passage 221 is provided inside the brake disc body 22. The high-pressure oil passage 221 communicates with the oil cavity through branch oil passages 222. The oil cavity and the branch oil passages 222 correspond one-to-one. The high-pressure oil passage 221 communicates with the cavity. The hydraulic oil pressurized by the push rod 11 sequentially enters the oil cavity through the high-pressure oil passage 221 and the branch oil passages 222.

[0048] Specifically, the solenoid valve component 1 further includes a coil frame 14, which surrounds the armature 13, and the coil 19 is disposed on the coil frame 14. A guide sleeve 15 is disposed between the coil frame 14 and the armature 13. A solenoid valve housing 17 is also disposed outside the coil 19. One end of the solenoid valve housing 17 is provided with an end cap 16, and the other end of the solenoid valve housing 17 is provided with a pole shoe 12. The push rod 11 extends out of the pole shoe 12, and the pole shoe 12 is provided with a through hole through which the push rod 11 passes. A plug 18 is also provided on the solenoid valve housing 17, and the plug 18 is connected to the current controller.

[0049] The brake disc body 22 is further provided with a brake disc body cover 21. The brake disc body cover 21 is provided with a low-pressure oil passage 223. The area between the piston 24 and the low-pressure oil passage 223 within the oil chamber is the low-pressure oil chamber, and the low-pressure oil passage 223 communicates with the low-pressure oil chamber. The area within the oil chamber opposite to the low-pressure oil chamber is the high-pressure oil chamber 224, and the high-pressure oil chamber 224 communicates with the branch oil passage 222. The piston 24 is located between the low-pressure oil chamber and the high-pressure oil chamber 224. The brake disc body 22 is provided with a brake chamber, and oil chambers are respectively provided on the upper and lower sides of the brake chamber. A piston 24 is slidably connected within each oil chamber. Brake pads 26 are respectively mounted on the pistons 24 via rods, with each brake pad 26 corresponding to one piston 24. A brake spring 25 is provided between each brake pad 26 and the brake disc body 22. The brake disc body 22 is also provided with a brake disc body lower cover 23, and the brake disc body lower cover 23 is provided with a low-pressure oil passage 223, which is connected to the low-pressure oil chamber located on the lower side of the brake chamber.

[0050] The working principle of this embodiment:

[0051] When the wind turbine is operating under stable wind conditions, the brake disc component 1 engages with the yaw system gear to achieve braking. When the wind direction changes, the braking device acts before the yaw system, releasing the yaw system gear to facilitate yaw.

[0052] The brake disc assembly 2 consists of a brake disc body 22, a brake spring 25, a piston 24, and brake pads 26. The brake disc body 22 has a high-pressure oil passage 221 inside. One end of the high-pressure oil passage 221 is connected to the push rod 11 at the end of the solenoid valve assembly 1, and the other end is connected to the high-pressure oil chamber 224 of the piston 24 via a branch oil passage 222.

[0053] The solenoid valve component 1 is the core driving component. When energized, the push rod 11 in the solenoid component 1 pushes the hydraulic oil in the high-pressure oil passage 221 of the brake disc body, increasing its oil pressure. The brake disc component 2 is a normally closed structure. Under normal circumstances, the brake spring 25 presses the brake pads 26 against the yaw system gear ring, which is the braking state.

[0054] When the solenoid valve component 1 is energized, the armature 13, under the action of electromagnetic force, pushes the push rod 11 to pressurize the hydraulic oil in the high-pressure oil passage 221. The pressure of the hydraulic oil is transmitted along the high-pressure oil passage 221 of the brake disc body to the high-pressure oil chamber 224 of the piston, pushing the piston 24 and the brake pad 26 to move against the preload force of the brake spring 25, releasing the yaw system gear. After yaw is completed, the solenoid component 1 is de-energized, and the hydraulic oil pressure in the high-pressure oil passage 221, the branch oil passage 222, and the high-pressure oil chamber 224 drops instantaneously. The piston 24 and the brake pad 26 sit down under the action of spring force, and the brake disc body component 2 grips the yaw system gear and returns to the braking state.

[0055] This invention is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this invention. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this invention are within the protection scope of this invention.

Claims

1. An electro-hydraulic brake device for a large wind turbine yaw system, characterized in that: The system includes a solenoid valve component and a brake disc body component. The brake disc body component includes a brake disc body, and an oil chamber is provided inside the brake disc body. A piston is slidably connected inside the oil chamber. A brake pad is mounted on the piston via a rod. The brake pad is located outside the oil chamber. A brake spring is provided between the brake pad and the brake disc body. When the wind turbine is operating normally under a stable wind direction, the brake pads grip the yaw system gear disc under the preload of the brake spring to achieve braking. When the wind direction changes, the brake disc assembly releases the yaw system gear before the yaw system. The solenoid valve assembly is energized and uses hydraulic oil to push the piston to overcome the preload of the brake spring, thereby releasing the yaw system gear to achieve yaw. After yaw is completed, the solenoid valve component is de-energized, the hydraulic oil pressure drops, and the piston and brake pads move under the elastic force of the brake spring, causing the brake disc component to grip the yaw system gear disc.

2. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 1, characterized in that: The solenoid valve component includes an armature and a coil for driving the armature. A push rod is provided on the armature. The solenoid valve component also includes a cavity for storing hydraulic oil. Under the action of electromagnetic force, the armature pressurizes the hydraulic oil in the cavity through the push rod. The hydraulic oil enters the oil cavity through an oil passage and drives the piston.

3. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 2, characterized in that: The solenoid valve component also includes a current controller, which controls the electromagnetic force applied by the coil to the armature by controlling the current parameters entering the coil.

4. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 3, characterized in that: The brake disc body is provided with a high-pressure oil passage, which is connected to the oil chamber through a branch oil passage. The oil chamber and the branch oil passage correspond one-to-one. The high-pressure oil passage is connected to the cavity. The hydraulic oil pressurized by the push rod enters the oil chamber sequentially through the high-pressure oil passage and the branch oil passage.

5. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 4, characterized in that: The solenoid valve component also includes a coil frame, which is arranged around the armature, and the coil is disposed on the coil frame.

6. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 5, characterized in that: A guide sleeve is provided between the coil frame and the armature. A solenoid valve housing is also provided outside the coil. One end of the solenoid valve housing is provided with an end cap, and the other end of the solenoid valve housing is provided with a pole shoe. The push rod extends out of the pole shoe, and the pole shoe is provided with a through hole through which the push rod passes.

7. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 6, characterized in that: The solenoid valve housing is also provided with a plug, which is connected to the current controller.

8. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 4, characterized in that: The brake disc body is also provided with a brake disc body cover, and the brake disc body cover is provided with a low-pressure oil passage. The area between the piston and the low-pressure oil passage in the oil chamber is the low-pressure oil chamber. The low-pressure oil passage is connected to the low-pressure oil chamber. The area in the oil chamber opposite to the low-pressure oil chamber is the high-pressure oil chamber. The high-pressure oil chamber is connected to the branch oil passage. The piston is located between the low-pressure oil chamber and the high-pressure oil chamber.

9. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 6, characterized in that: The brake disc body is provided with a brake chamber, and oil chambers are respectively provided on the upper and lower sides of the brake chamber. A piston is slidably connected in each oil chamber. The brake pads are respectively installed on the pistons through rods. The brake pads correspond one-to-one with the pistons. A brake spring is provided between the brake pads and the brake disc body.

10. The electro-hydraulic brake device for a large wind turbine yaw system according to claim 9, characterized in that: The brake disc body is also provided with a lower cover, and a low-pressure oil passage is provided on the lower cover. The low-pressure oil passage on the lower cover is connected to the low-pressure oil chamber located on the lower side of the brake chamber.

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