Brake system of wind power generation equipment
By using a combination of non-Newtonian fluid and electromagnet adsorption friction wheel in wind power generation equipment, the problem of thermal fade in traditional braking systems is solved, stable generator deceleration is achieved, and safe operation of the equipment is ensured under high wind speed conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG GUOMAI ELECTRIC CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-04-28
AI Technical Summary
Under high wind speed conditions, existing wind power generation equipment suffers from nonlinear decay of braking torque due to the thermal degradation effect of friction materials caused by traditional contact braking systems. This makes it difficult to maintain braking stability over a long period of time, affecting the operational safety of the equipment.
Using a non-Newtonian fluid as the resistance medium, the generator gradually decelerates by attracting the friction wheel with an electromagnet. Combined with a gearbox and guide rail system, the non-Newtonian fluid provides stable frictional resistance to reduce the generator speed.
It achieves stable deceleration of the generator under high wind speed conditions, avoids the risk of thermal decay of traditional friction braking, and ensures the long-term operational stability of the equipment.
Smart Images
Figure CN224174454U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of generator braking technology, and in particular to a braking system for wind power generation equipment. Background Technology
[0002] Existing wind power generation equipment uses a fan impeller that is rotatably connected to the base of the equipment. Multiple blades are installed on the fan impeller, which is connected to a gearbox to drive the gearbox to run. The gearbox is connected to an engine to drive a generator to generate electricity. A casing is installed on top of the base to cover the above components and protect them.
[0003] When wind turbines encounter abnormally high wind speeds or sudden load changes, they need to use braking systems to effectively reduce the speed of high-speed rotating components to prevent overload operation that could lead to equipment damage or unstable power output. Existing braking solutions generally employ a clamping mechanical braking structure, which uses a brake disc rigidly connected to the generator output shaft to generate frictional resistance for braking.
[0004] However, this type of contact braking mechanism has significant drawbacks. Due to the continuous nature of strong winds, the brake pads and brake discs generate a rapid accumulation of heat during long-term, uninterrupted braking, which exacerbates the thermal decay effect of the friction material. The braking torque decreases nonlinearly with increasing temperature, making it difficult to maintain the stability required for long-term linear braking and restricting the operational safety of wind turbine generators in high-wind-speed scenarios. Utility Model Content
[0005] The purpose of this invention is to provide a braking system for wind power generation equipment, which gradually reduces the operating speed of the generator by increasing the resistance to the rotation of the generator's output shaft through a non-Newtonian fluid.
[0006] The technical solution adopted by the braking system of the wind power generation equipment disclosed in this utility model is:
[0007] The device includes a base, a gearbox, and a generator. The base has a housing filled with a non-Newtonian fluid. A guide rail is mounted on the base, and a slide block is slidably connected to the guide rail. A contact rod is fixedly connected to the slide block, with one end of the contact rod extending into the housing. The gearbox has a drive wheel fixedly connected to its output shaft. A rocker arm is rotatably connected to the drive wheel, with one end of the rocker arm rotatably connected to the slide block. An electromagnet is fixedly connected to the gearbox. A first friction wheel is fixedly connected to the input shaft of the gearbox. The gearbox is placed on the base. A second friction wheel is axially slidably connected to the output shaft of the generator. A spring is mounted on the output shaft of the generator, with both ends of the spring contacting the second friction wheel and the output shaft of the generator, respectively. The generator is placed on the base, and its output shaft and the input shaft of the gearbox are on the same axis. The first friction wheel is located between the second friction wheel and the electromagnet.
[0008] As a preferred embodiment, a key bar is embedded on the input shaft of the gearbox, a keyway is provided on the first friction wheel, the key bar is inserted into the keyway, and a first retaining spring is sleeved on the input shaft of the gearbox, the first retaining spring contacting the first friction wheel.
[0009] As a preferred embodiment, the electromagnet is annular, and the first friction wheel has multiple spaced through slots.
[0010] As a preferred embodiment, the output shaft of the generator has two first sliding grooves, in which multiple shims are placed, and a roller is placed between two adjacent shims. The second friction wheel has two second sliding grooves, in which the shims and rollers slide in contact with each other. One of the shims abuts against the groove wall of the second sliding groove. A nut is fixedly connected to the output shaft of the generator. The two ends of the spring abut against the other shim and the nut, respectively. A second retaining ring is sleeved on the output shaft of the generator, and the second retaining ring abuts against the second friction wheel.
[0011] As a preferred embodiment, a worm gear and a helical gear are rotatably connected inside the gearbox. The worm gear and the helical gear are connected in a mating manner. One end of the worm gear extends out of the gearbox. The input shaft of the gearbox is the worm gear. A central shaft passes through the center of the helical gear. The two ends of the central shaft extend out from both sides of the gearbox. The output shaft of the gearbox is the central shaft.
[0012] As a preferred embodiment, there are two drive wheels, which are fixedly connected to both ends of the central shaft. The connection between the rocker arm and the drive wheel is close to the edge of the drive wheel. There are two receiving boxes and two guide rails.
[0013] As a preferred embodiment, the containment box is covered with a cover plate, the cover plate has a ventilation groove, the containment box is provided with a sealing seat, the sealing seat has a through hole, the through hole extends into the containment box, a sealing ring is provided in the through hole, the contact rod passes through the through hole, and the sealing ring is sleeved on the outside of the contact rod.
[0014] The beneficial effects of the braking system for wind power generation equipment disclosed in this utility model are:
[0015] The output shaft of the gearbox is connected to the input shaft of the generator, and the fan impeller drives the generator to generate electricity via the gearbox;
[0016] When the generator needs to brake, the electromagnet is energized to generate a magnetic force that attracts the second friction wheel to slide axially on the generator's output shaft. This causes the second friction wheel to contact the first friction wheel, allowing the generator's output shaft to drive the gearbox via the second and first friction wheels.
[0017] The output shaft of the gearbox drives the drive wheel to rotate. The drive wheel drives the slide to reciprocate on the guide rail via the rocker arm. The contact rod performs piston motion with the slide in the non-Newtonian fluid of the housing box. The non-Newtonian fluid applies resistance to the sliding of the contact rod, thus achieving generator deceleration. The heat generated by the friction of the non-Newtonian fluid on the contact rod is limited, which can maintain long-term braking stability and effectively avoid the risk of thermal fade of traditional friction braking. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the braking system of a wind power generation device according to this utility model.
[0019] Figure 2 This is a schematic diagram of the housing structure of the braking system of a wind power generation device according to this utility model.
[0020] Figure 3 This is a schematic diagram of the gearbox structure of a braking system for a wind power generation device according to this utility model.
[0021] Figure 4 This is a schematic diagram of the gearbox and generator of the braking system of a wind power generation device according to this utility model.
[0022] Figure 5 This is a cross-sectional view of the first and second friction wheels of the braking system of a wind power generation device according to this utility model.
[0023] Figure 6 This is a schematic diagram of the installation of the first friction wheel in the braking system of a wind power generation device according to this utility model.
[0024] Figure 7 This is a schematic diagram of the installation of the second friction wheel in the braking system of a wind power generation device according to this utility model. Detailed Implementation
[0025] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:
[0026] Please refer to Figure 1 and Figure 2 .
[0027] This utility model discloses a braking system for a wind power generation device, including a base 1, a gearbox 2, and a generator 3;
[0028] The base 1 is provided with a housing 11. In this embodiment, it is preferred that there are two housings 11, which are close to the two sides of the base 1. The housing 11 is covered with a cover plate 111, which is rotatably connected to the housing 11. The cover plate 111 is provided with a ventilation groove 112. By opening the cover plate 111, non-Newtonian fluid can be filled into the housing 11. By closing the cover plate 111, dust can be prevented from entering the housing 11.
[0029] Furthermore, the base 1 is provided with guide rails 12. In this embodiment, it is preferred that there are two guide rails 12. The two guide rails 12 are respectively close to the two receiving boxes 11, and the guide rails 12 and the receiving boxes 11 are located on the same straight line. A slide block 121 is slidably connected to the guide rail 12, and a contact rod 122 is fixedly connected to the slide block 121. The contact rod 122 is parallel to the guide rail 12.
[0030] Furthermore, the housing 11 is provided with a sealing seat 113, and a through hole is provided through the sealing seat 113. The through hole extends into the housing 11, and a sealing ring is provided inside the through hole; one end of the contact rod 122 extends into the housing 11 through the through hole, and the sealing ring is sleeved on the outside of the contact rod 122.
[0031] Furthermore, multiple contact pieces 123 arranged at intervals are welded to the outer end of the contact rod 122;
[0032] The slide block 121 slides back and forth on the guide rail 12, thereby repeatedly pulling and pushing the contact rod 122 to perform piston movement in the housing 11. The non-Newtonian fluid can apply resistance to the sliding process of the contact rod 122. When the contact rod 122 is pulled out of the housing 11, the contact piece 123 can ensure that the resistance applied to the contact rod 122 by the non-Newtonian fluid does not decrease.
[0033] Please refer to Figure 1 , Figure 3 and Figure 4 .
[0034] The gearbox 2 is equipped with a worm gear and a helical gear that rotate inside. The worm gear and the helical gear are connected in a meshing manner. One end of the worm gear passes through the gearbox 2, and the input shaft of the gearbox 2 is the worm gear. The center of the helical gear is connected to a central shaft, and the two ends of the central shaft pass through the two sides of the gearbox 2 respectively. The output shaft of the gearbox 2 is the central shaft.
[0035] Furthermore, the gearbox 2 is provided with two drive wheels 22, which are fixedly connected to the two ends of the central shaft respectively; a rocker arm 221 is rotatably connected to the drive wheel 22, and the connection between the rocker arm 221 and the drive wheel 22 is close to the edge of the drive wheel 22.
[0036] Furthermore, point A is the connection point between one rocker arm 221 and one drive wheel 22, and point B is the connection point between the other rocker arm 221 and another drive wheel 22. With the central axis as the center, the angle between point A and point B is 90°. When the drive wheel 22 rotates to pull or push the rocker arm 221, there will be a low torque phase zone. When one drive wheel 22 enters the low torque phase zone, the other drive wheel 22 moves out of the low torque phase zone to balance the load fluctuation of the output shaft of the reduction gearbox 2.
[0037] Please refer to Figure 1 and Figures 4-6 .
[0038] The gearbox 2 is placed on the base 1, and an electromagnet 23 is fixedly connected to the gearbox 2. In this embodiment, the electromagnet 23 is preferably annular, so that the input shaft of the gearbox 2 can pass through the center of the electromagnet 23.
[0039] Furthermore, a first friction wheel 24 is fixedly connected to the input shaft of the gearbox 2, and an electromagnet 23 is close to the first friction wheel 24. In this embodiment, the distance between the first friction wheel 24 and the electromagnet 23 is preferably 3mm to avoid the first friction wheel 24 from contacting the electromagnet 23 when rotating. A key bar 211 is embedded in the input shaft of the gearbox 2. A first mounting hole is passed through the first friction wheel 24, and a keyway 241 is opened on the first friction wheel 24. The keyway 241 is located on the inner wall of the first mounting hole, and one end of the keyway 241 protrudes from the first mounting hole. This facilitates the key bar 211 to be inserted into the keyway 241 when the first mounting hole of the first friction wheel 24 is fitted onto the input shaft of the gearbox 2, and the key bar 211 touches the groove wall of the keyway 241.
[0040] Furthermore, a first retaining ring 212 is sleeved on the input shaft of the gearbox 2, and the first retaining ring 212 contacts the first friction wheel 24; the first friction wheel 24 is clamped and fixed on the input shaft of the gearbox 2 by the first retaining ring 212 and the key bar 211. When the electromagnet 23 is energized and generates a suction force, the key bar 211 constrains the first friction wheel 24 to be attracted by the electromagnet 23 and move closer.
[0041] Furthermore, the first friction wheel 24 has multiple through slots 242 arranged at intervals, and the multiple through slots 242 are arranged around the center of the first friction wheel 24; when the electromagnet 23 is energized and generates attraction, the through slots 242 can reduce the first friction wheel 24 from weakening the magnetic field generated by the electromagnet 23.
[0042] Please refer to Figure 1 , Figure 4 , Figure 5 and Figure 7 .
[0043] In this embodiment, the generator 3 is preferably a dual-shaft generator 3, which is fixedly connected to the top of the base 1; the fan impeller 13 is rotatably connected to the base 1, the gearbox 14 is fixedly connected to the base 1, the fan impeller 13 is connected to the input shaft of the gearbox 14, and the output shaft of the gearbox 14 is connected to the input shaft of the generator 3. The ambient wind drives the fan impeller 13 to rotate, and the fan impeller 13 drives the generator 3 to operate and generate electricity through the gearbox 14.
[0044] Two first sliding grooves 311 are provided on the output shaft of the generator 3, and the first sliding grooves 311 are parallel to the output shaft of the generator 3. A second friction wheel 32 is axially slidably connected to the output shaft of the generator 3. A second mounting hole is passed through the second friction wheel 32. Two second sliding grooves 321 are provided on the second friction wheel 32. The second sliding grooves 321 are located on the inner wall of the second mounting hole. One end of the second sliding groove 321 extends out of the second mounting hole. The first sliding grooves 311 are parallel to the second sliding grooves 321. Two protrusions extend from the inner wall of the second mounting hole. The two protrusions are close to the two second sliding grooves 321 respectively. The second friction wheel 32 is sleeved on the outside of the output shaft of the generator 3 through the second mounting hole. The two protrusions slide into the two first sliding grooves 311 respectively, which serves as a positioning function to facilitate installation.
[0045] Furthermore, multiple gaskets are placed in the first slide groove 311. In this embodiment, three gaskets are preferably placed. A roller 312 is placed between two adjacent gaskets. The gaskets and rollers 312 are placed in sliding contact in the second slide groove 321, with one gasket abutting against the groove wall of the second slide groove 321. The output shaft of the generator 3 drives the second friction wheel 32 to rotate synchronously through the roller 312. The roller 312 can reduce the friction force of the second friction wheel 32 sliding on the output shaft of the generator 3.
[0046] Furthermore, the output shaft of the generator 3 is provided with a spring 313. In this embodiment, it is preferred that there are two springs 313, and the two springs 313 are respectively placed in two second sliding grooves 321. A nut 314 is fixedly connected to the output shaft of the generator 3. One end of the spring 313 touches the nut 314, and the other end of the spring 313 touches another washer. A second retaining ring 315 is sleeved on the output shaft of the generator 3. The second retaining ring 315 touches the second friction wheel 32.
[0047] Furthermore, the output shaft of the generator 3 and the input shaft of the gearbox 2 are located on the same axis, and the first friction wheel 24 is located between the second friction wheel 32 and the electromagnet 23;
[0048] Spring 313 pushes the washer to contact the second friction wheel 32 and slides away from the second friction wheel 32 on the output shaft of generator 3. Second snap ring 315 constrains the sliding distance of the second friction wheel 32. The distance between the first friction wheel 24 and the second friction wheel 32 is 3mm.
[0049] Please refer to Figures 1-7 .
[0050] When the operating environment of this equipment enters windy weather, the fan impeller 13 drives the generator 3 into overload operation. When the electromagnet 23 is energized, it generates magnetic force, which attracts the second friction wheel 32 and makes it slide axially on the output shaft of the generator 3. This causes the second friction wheel 32 to contact the first friction wheel 24 and compress the spring 313. The output shaft of the generator 3 then drives the gearbox 2 through the second friction wheel 32 and the first friction wheel 24. When the second friction wheel 32 first contacts the first friction wheel 24, its rotational speed is too fast and it will slip on the first friction wheel 24. After the rotational speed of the first friction wheel 24 is increased by the second friction wheel 32, it achieves synchronous rotation. The output shaft of the generator 3 drives the input shaft of the gearbox 2 to rotate at the same speed. This design can prevent the generator 3 from being damaged by sudden braking during overload operation.
[0051] The output shaft of the gearbox 2 drives the two drive wheels 22 to rotate at the same speed. The drive wheels 22 drive the slide 121 to reciprocate on the guide rail 12 via the rocker arm 221. The contact rod 122 performs piston motion with the slide 121 in the non-Newtonian fluid of the housing box 11. The non-Newtonian fluid applies resistance to the sliding of the contact rod 122, continuously and gradually reducing the rotational speed of the drive wheel 22, thereby decelerating the generator 3. Since the heat generated by the friction of the non-Newtonian fluid on the contact rod 122 is limited, it can maintain long-term braking stability and avoid the risk of thermal decay of traditional friction braking.
[0052] When the generator 3 does not require braking, the power supply to the electromagnet 23 is cut off. After the second friction wheel 32 loses the attraction force of the electromagnet 23, it is reset under the push of the spring 313, allowing the generator 3 to operate independently.
[0053] This utility model provides a braking system for a wind power generation device, wherein the output shaft of the gearbox is connected to the input shaft of the generator, and the fan impeller drives the generator to generate electricity via the gearbox;
[0054] When the generator needs to brake, the electromagnet is energized to generate a magnetic force that attracts the second friction wheel to slide axially on the generator's output shaft. This causes the second friction wheel to contact the first friction wheel, allowing the generator's output shaft to drive the gearbox via the second and first friction wheels.
[0055] The output shaft of the gearbox drives the drive wheel to rotate. The drive wheel drives the slide to reciprocate on the guide rail via the rocker arm. The contact rod performs piston motion with the slide in the non-Newtonian fluid of the housing box. The non-Newtonian fluid applies resistance to the sliding of the contact rod, thus achieving generator deceleration. The heat generated by the friction of the non-Newtonian fluid on the contact rod is limited, which can maintain long-term braking stability and effectively avoid the risk of thermal fade of traditional friction braking.
[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A braking system for a wind power generation device, characterized in that, include A base, on which a receiving box is provided, the receiving box being filled with a non-Newtonian fluid, a guide rail being provided on the base, a slide block being slidably connected to the guide rail, and a contact rod being fixedly connected to the slide block, one end of the contact rod being inserted into the receiving box; A reduction gearbox is provided with a drive wheel, which is fixedly connected to the output shaft of the reduction gearbox. A rocker arm is rotatably connected to the drive wheel, and one end of the rocker arm is rotatably connected to a slide. An electromagnet is fixedly connected to the reduction gearbox, and a first friction wheel is fixedly connected to the input shaft of the reduction gearbox. The reduction gearbox is placed on a base. A generator has a second friction wheel axially slidably connected to its output shaft. A spring is provided on the output shaft of the generator, with the two ends of the spring contacting the second friction wheel and the output shaft of the generator, respectively. The generator is placed on a base, and the output shaft of the generator and the input shaft of the gearbox are on the same axis. The first friction wheel is located between the second friction wheel and the electromagnet.
2. The braking system for a wind power generation device as described in claim 1, characterized in that, A key bar is embedded on the input shaft of the gearbox, and a keyway is provided on the first friction wheel. The key bar is inserted into the keyway, and a first retaining spring is sleeved on the input shaft of the gearbox, with the first retaining spring contacting the first friction wheel.
3. The braking system for a wind power generation device as described in claim 2, characterized in that, The electromagnet is circular, and the first friction wheel has multiple spaced through slots.
4. The braking system for a wind power generation device as described in claim 3, characterized in that, The generator's output shaft has two first sliding grooves, each containing multiple shims. A roller is placed between two adjacent shims. The second friction wheel has two second sliding grooves, where the shims and rollers slide in contact. One of the shims abuts against the groove wall of the second sliding groove. A nut is fixedly connected to the generator's output shaft. The two ends of the spring abut against another shim and the nut, respectively. A second retaining ring is fitted onto the generator's output shaft, and the second retaining ring abuts against the second friction wheel.
5. The braking system for a wind power generation device as described in claim 4, characterized in that, The gearbox contains a worm gear and a helical gear that rotate within it. The worm gear and the helical gear are connected in a meshing manner. One end of the worm gear extends out of the gearbox. The input shaft of the gearbox is the worm gear. A central shaft passes through the center of the helical gear. The two ends of the central shaft extend out from both sides of the gearbox. The output shaft of the gearbox is the central shaft.
6. The braking system for a wind power generation device as described in claim 5, characterized in that, There are two drive wheels, which are fixedly connected to both ends of the central shaft. The connection between the rocker arm and the drive wheel is close to the edge of the drive wheel. There are two housing boxes and two guide rails.
7. The braking system for a wind power generation device as described in claim 6, characterized in that, The containment box is covered with a cover plate, the cover plate has a ventilation groove, the containment box is provided with a sealing seat, the sealing seat has a through hole, the through hole extends into the containment box, a sealing ring is provided in the through hole, the contact rod passes through the through hole, and the sealing ring is sleeved on the outside of the contact rod.