Mechanical speed reducing and braking device of wind driven generator

Abstract

The utility model belongs to the technical field of wind driven generators, in particular to a mechanical speed reduction brake device of a wind driven generator, which comprises a transmission shaft main body, a brake disc and two support calipers, the two support calipers are provided with clamping grooves and abdicating notches, two hydraulic piston bodies are mounted in the support calipers, and the two hydraulic piston bodies are arranged on the transmission shaft main body. Brake pads are mounted at one ends of the two hydraulic piston bodies, exhaust outlets are formed in the two clamping grooves, and a connecting plate is fixedly connected between the two supporting calipers; the two supporting calipers are controlled to alternately decelerate the brake disc, and air flow is blown to the brake pad and the brake disc for cooling through the exhaust outlets, so that the phenomenon that the brake pad keeps friction with the brake disc for a long time to generate overheating is prevented, and the situation that the material performance is reduced and the brake effect is affected due to overheating of the brake pad is prevented; the conditions of brake pad burnout or brake failure are reduced, serious accidents such as wind driven generator blade breakage and tower drum collapse are reduced, and the safety of surrounding personnel and facilities is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind turbines, and particularly relates to a mechanical speed reduction and braking device for wind turbines. Background Art

[0002] The mechanical speed reduction and braking device of a wind turbine is an important device for controlling the rotation speed and stopping the rotation of the wind turbine. It mainly realizes speed reduction and braking through the friction force, meshing force or other mechanical resistances between mechanical components. Common ones include disc brakes, drum brakes, etc.

[0003] When equipment maintenance and repair are required and the rotation speed exceeds the set threshold and shutdown is needed, the control system issues a braking instruction to facilitate maintenance and ensure the safe operation of the equipment. In actual use, due to the large thrust exerted on the wind turbine blades by strong wind weather, the blade rotation speed is too fast. At this time, it is usually chosen to apply resistance to the transmission shaft by using the braking assembly to achieve speed reduction and ensure the safe and stable operation of the wind power. However, sometimes the strong wind lasts for too long, resulting in the braking assembly squeezing the transmission shaft for a long time, or during long-term braking, continuous braking will cause a large amount of frictional heat to be generated between the brake pads and the brake disc. Overheating may cause the material performance of the brake pads to decline, reducing the braking effect, and even may cause the brake pads to burn out or the braking to fail. The wind turbine may run at an overspeed, resulting in serious accidents such as blade breakage and tower barrel collapse, threatening the safety of surrounding personnel and facilities. Summary of the Utility Model

[0004] The utility model provides a mechanical speed reduction and braking device for wind turbines, which has the characteristic of improving the continuous operation ability during braking and speed reduction of the wind turbine.

[0005] The utility model provides the following technical solution: It includes a transmission shaft main body, a brake disc and two support calipers. Both of the two support calipers are provided with a card slot and a relief notch. Two hydraulic piston bodies are installed in the support calipers. One end of each of the two hydraulic piston bodies is installed with a brake pad. The brake pad is slidably connected to one side of the brake disc. An air exhaust port is arranged in each of the two card slots, and the air exhaust port corresponds to the positions of the brake disc and the two brake pads. The two support calipers are symmetrically distributed on both sides of the brake disc, and a connecting plate is fixedly connected between the two support calipers.

[0006] Wherein, a circular groove is opened at the top end of the connecting plate, a circular segment plate is rotatably connected to the inner wall of the circular groove, and two touch switches for controlling the expansion and contraction of the hydraulic piston body are installed on the inner wall of the circular groove. The circular segment plate controls the extrusion of the two circular segment plates.

[0007] Wherein, a spherical rolling body is arranged at one end of each of the two touch switches, and the spherical rolling body is slidably connected to the side wall of the circular segment plate.

[0008] Wherein, two temperature sensors are installed on the inner walls of the two slots, and the temperature sensors correspond to the positions of the brake disc and the brake pad.

[0009] Among them, a heat dissipation fan is installed on one side of the connecting plate, a diversion groove is opened in the connecting plate, an air flow groove is opened in the supporting caliper, and the exhaust port is connected with the internal space of the diversion groove through the corresponding air flow groove.

[0010] The beneficial effects of the utility model are as follows: by controlling the two supporting calipers to alternately decelerate the brake disc, and blowing air flow to the brake pad and the brake disc through the exhaust port to cool down the brake pad, the overheating of the brake pad caused by long-term friction with the brake disc is prevented, the degradation of material properties caused by overheating of the brake pad is prevented, and the impact on the braking effect is reduced. The occurrence of brake pad burning or brake failure is reduced, and the occurrence of serious accidents such as wind turbine blade breakage and tower collapse is reduced, thereby improving the safety of surrounding personnel and facilities.

[0011] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model in a top view;

[0015] Figure 4 It is a side view structural schematic diagram of the utility model;

[0016] Figure 5 for Figure 2 Enlarged schematic diagram of part A in the middle.

[0017] In the figure: 1. Drive shaft body; 11. Brake disc; 2. Support caliper; 21. Card slot; 211. Make way gap; 22. Hydraulic piston body; 221. Touch pressure switch; 222. Spherical rolling body; 23. Brake pad; 24. Exhaust port; 25. Temperature sensor; 26. Air flow groove; 3. Connecting plate; 31. Circular groove; 32. Round plate; 33. Cooling fan; 34. Diverter groove. DETAILED DESCRIPTION

[0018] See also Figures 1 - 5, the present utility model provides the following technical solutions: It includes a drive shaft main body 1, a brake disc 11, and two support calipers 2. Slots 21 and relief notches 211 are provided on both of the two support calipers 2. Two hydraulic piston bodies 22 are installed inside the support calipers 2. Brake pads 23 are installed at one end of each of the two hydraulic piston bodies 22. The brake pads 23 are slidably connected to one side of the brake disc 11. Exhaust ports 24 are provided in both of the two slots 21. The exhaust ports 24 correspond to the positions of the brake disc 11 and the two brake pads 23. The two support calipers 2 are symmetrically distributed on both sides of the brake disc 11. A connecting plate 3 is fixedly connected between the two support calipers 2.

[0019] In this implementation scheme: The two support calipers 2 are distributed on both sides of the drive shaft main body 1. The two support calipers 2 make way for the brake disc 11 through the slots 21 and the slots 21, so that the two hydraulic piston bodies 22 on the support calipers 2 can clamp the brake disc 11. When the hydraulic piston bodies 22 slide telescopically inside the support calipers 2, they can drive the brake pads 23 to contact and separate from the brake disc 11. The hydraulic piston bodies 22 drive the brake pads 23. The brake pads 23 can apply resistance when contacting the brake disc 11 by virtue of the high friction of their own materials. The hydraulic piston bodies 22 decelerate and brake the brake disc 11 through the brake pads 23. The support calipers 2 control the telescopic movement of the two hydraulic piston bodies 22 hydraulically. The connecting plate 3 connects the two support calipers 2. The connecting plate 3 is installed on the internal support frame of the machine body, so that the connecting plate 3 can drive the two support calipers 2 to keep a fixed position with the brake disc 11. The hydraulic piston bodies 22 on the two support calipers 2 can decelerate or brake the brake disc 11 simultaneously or individually. When decelerating the brake disc 11 for a long time and continuously, control the two support calipers 2 to work alternately, so that the hydraulic piston bodies 22 on the two support calipers 2 can alternately clamp and decelerate the brake disc 11. At the same time, the exhaust ports 24 exhaust air, so that the wind can blow and cool the brake pads 23 and the brake disc 11 simultaneously, and then the four brake pads 23 can intermittently contact the brake disc 11, preventing the brake pads 23 from continuously rubbing against the brake disc 11 for a long time and generating overheating, preventing the material performance of the brake pads 23 from decreasing due to overheating, affecting the braking effect, reducing the occurrence of situations such as the brake pads burning out or the brakes failing, reducing the occurrence of serious accidents such as the fracture of the wind turbine blades and the collapse of the tower barrel, and improving the safety of the surrounding personnel and facilities.

[0020] A circular groove 31 is provided at the top of the connecting plate 3. The inner wall of the circular groove 31 is rotatably connected with a sector plate 32. Two touch switches 221 for controlling the expansion and contraction of the hydraulic piston body 22 are installed on the inner wall of the circular groove 31. The sector plate 32 controls the extrusion of the two sector plates 32; the circular groove 31 makes way for the sector plate 32. A motor for driving the rotation of the sector plate 32 is installed in the connecting plate 3. The touch switches 221 are enabled when it is necessary to decelerate or brake the main transmission shaft 1. The two touch switches 221 respectively send electrical signals to control the hydraulic systems of the corresponding two hydraulic piston bodies 22, so that the hydraulic piston bodies 22 can expand and contract. When the sector plate 32 squeezes the touch switch 221, the hydraulic piston body 22 can extend. When the sector plate 32 is separated from the touch switch 221, the touch switch 221 is no longer squeezed, so that the two hydraulic piston bodies 22 corresponding to the touch switch 221 can contract. By rotating the sector plate 32, the two touch switches 221 can be sequentially squeezed and controlled. When the two touch switches 221 exchange work, the sector plate 32 can be in contact with and squeeze the two touch switches 221 at the same time, so that the deceleration effect of the main transmission shaft 1 is always there, improving the stability during the long-term deceleration of the main transmission shaft 1.

[0021] Spherical rolling bodies 222 are provided at one ends of the two touch switches 221. The spherical rolling bodies 222 are slidably connected to the side wall of the sector plate 32; the touch switches 221 are in contact with the side wall of the sector plate 32 through the spherical rolling bodies 222, reducing the sliding friction resistance and friction loss problems between the sector plate 32 and the touch switches 221, which is beneficial for long-term use.

[0022] Two temperature sensors 25 are installed on the inner walls of the two clamping grooves 21. The temperature sensors 25 correspond to the positions of the brake disc 11 and the brake pads 23; when the brake pads 23 apply deceleration or braking to the brake disc 11, the temperature sensors 25 detect the temperature in this area. When the brake disc 11 and the brake pads 23 generate high heat due to long-term friction, the temperature sensors 25 can detect this situation in time, so as to control the air cooling and make the two support calipers 2 alternately decelerate the brake disc 11.

[0023] A cooling fan 33 is installed on one side of the connecting plate 3. A flow dividing groove 34 is provided in the connecting plate 3. An air flow groove 26 is provided in the support caliper 2. The air outlet 24 is communicated with the internal space of the flow dividing groove 34 through the corresponding air flow groove 26; the cooling fan 33 conveys air flow to the inside of the flow dividing groove 34. The flow dividing groove 34 guides the air flow to the position of the air outlet 24 through the air flow groove 26, and the air flow is released from the air outlet 24 to the positions of the brake pads 23 and the brake disc 11 to achieve cooling.

[0024] The working principle and usage process of the present utility model: When the device is in use, if the rotational speed of the wind turbine blade is too fast, the hydraulic piston body 22 is controlled to drive the brake pad 23 to contact the brake disc 11, so as to decelerate the brake disc 11 and the transmission shaft main body 1. When the brake disc 11 and the brake pad 23 generate high heat due to long-term friction, the temperature sensor 25 can detect this situation in a timely manner, thereby controlling the cooling fan 33 to start blowing air for cooling and the two support calipers 2 to alternately decelerate the brake disc 11. The circular segment plate 32 is controlled to rotate, and the circular segment plate 32 alternately presses the two touch switches 221, so that the hydraulic piston bodies 22 on the two support calipers 2 can intermittently decelerate the brake disc 11, and the brake pad 23 is intermittently in contact with the brake disc 11. At the same time, the cooling fan 33 conveys air flow into the diversion groove 34, and the diversion groove 34 guides the air flow to the air outlet 24 position through the air flow groove 26, and the air flow is discharged from the air outlet 24 to the positions of the brake pad 23 and the brake disc 11 to achieve cooling, prevent the phenomenon that the brake pad 23 keeps rubbing against the brake disc 11 for a long time and generates overheat, prevent the overheat of the brake pad 23 from causing the decline of material performance, affecting the braking effect, reduce the occurrence of the situation of the brake pad burning or the brake failure, reduce the occurrence of serious accidents such as the fracture of the wind turbine blade and the collapse of the tower barrel, and improve the safety of the surrounding personnel and facilities.

Claims

1. A mechanical deceleration brake device for a wind turbine generator, comprising a transmission shaft body (1), a brake disc (11) and two supporting calipers (2), characterized in that: The two support calipers (2) are each provided with a slot (21) and a clearance notch (211). Two hydraulic piston bodies (22) are installed in the support calipers (2). One end of the two hydraulic piston bodies (22) is provided with a brake pad (23). The brake pad (23) is slidably connected to one side of the brake disc (11). An exhaust port (24) is provided in the two slots (21). The exhaust port (24) corresponds to the position of the brake disc (11) and the two brake pads (23). The two support calipers (2) are symmetrically distributed on both sides of the brake disc (11). A connecting plate (3) is fixedly connected between the two support calipers (2).

2. The mechanical deceleration brake device for a wind turbine generator according to claim 1 is characterized in that: A circular groove (31) is provided at the top of the connecting plate (3), and a circular plate (32) is rotatably connected to the inner wall of the circular groove (31). Two touch-pressure switches (221) for controlling the extension and retraction of the hydraulic piston body (22) are installed on the inner wall of the circular groove (31), and the circular plate (32) controls the squeezing of the two circular plates (32).

3. The mechanical deceleration brake device for a wind turbine generator according to claim 2 is characterized in that: One end of each of the two touch-pressure switches (221) is provided with a spherical rolling body (222), and the spherical rolling body (222) is slidably connected to the side wall of the circular plate (32).

4. The mechanical deceleration brake device for a wind turbine generator according to claim 1, characterized in that: Two temperature sensors (25) are installed on the inner walls of the two clamping slots (21), and the positions of the temperature sensors (25) correspond to the positions of the brake disc (11) and the brake pad (23).

5. The mechanical deceleration brake device for a wind turbine generator according to claim 1, characterized in that: A heat dissipation fan (33) is installed on one side of the connecting plate (3), a diversion groove (34) is provided in the connecting plate (3), an air flow groove (26) is provided in the supporting caliper (2), and the exhaust port (24) is connected to the internal space of the diversion groove (34) through the corresponding air flow groove (26).

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