Overspeed brake based on wind driven generator

Abstract

The overspeed brake based on the wind driven generator comprises a roller shaft, a shaft sleeve, a brake movable disc, a brake pad, a limiting spring, a limiting wheel and a fly ball, the roller shaft is installed in the shaft sleeve through a bearing, the brake movable disc is fixedly installed on the surface of the shaft sleeve, and the brake movable disc is installed on the roller shaft in a spline connection mode. The braking movable discs are arranged at intervals, the limiting springs are installed between the braking movable discs, under the action of the limiting springs, the braking movable discs and the braking movable discs are spaced, normal rotation of the roller shaft is not affected, and when the rotating speed of the roller shaft exceeds the threshold value range, the fly balls deflect outwards under the action of centrifugal force. And the bending part of the fly ball is in contact with the limiting wheel, the braking movable disc is driven to be far away from the limiting wheel and face one end of the braking movable disc, under the action of the braking piece, speed reduction of the roller shaft is achieved, automatic speed reduction is achieved when the roller shaft rotates at an overspeed, and the problem of overspeed of a rotor of the wind driven generator is avoided.

Description

Technical Field

[0001] The utility model relates to the field of wind power generation equipment, and particularly relates to an overspeed brake based on a wind turbine generator. Background Art

[0002] With the continuous growth of the global demand for renewable energy, wind power generation, as a clean and renewable energy form, has become increasingly important. As the core component of the wind power generation system, the performance stability and safety of the wind turbine generator are directly related to the operating efficiency and economic benefits of the entire wind power generation system. However, during the actual operation of the wind turbine generator, due to various factors such as sudden changes in wind speed, improper control system design, and sensor failures, the problem of overspeed of the wind turbine generator rotor often occurs, which not only damages the mechanical structure of the wind turbine generator but also may cause serious safety accidents. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In order to solve the above problems of the prior art, the utility model provides an overspeed brake based on a wind turbine generator.

[0005] (2) Technical Solutions

[0006] In order to achieve the above object, the main technical solutions adopted by the utility model include:

[0007] An overspeed brake based on a wind turbine generator, comprising a roller shaft, a shaft sleeve, a stationary brake disc, a movable brake disc, brake pads, a limiting spring, a limiting wheel, and a flyweight;

[0008] The roller shaft is installed in the shaft sleeve through a bearing;

[0009] The stationary brake disc is fixedly installed on the surface of the shaft sleeve;

[0010] The movable brake disc is installed on the roller shaft by a spline connection method, and the stationary brake disc is arranged at intervals. The limiting spring is installed between the movable brake disc and the stationary brake disc, and brake pads are arranged on both sides of the movable brake disc and the stationary brake disc close to each other;

[0011] The limiting wheel is fixed on the roller shaft and is arranged on the side of the movable brake disc away from the stationary brake disc;

[0012] A plurality of groups of flyweights are provided, which are arranged at equal angular intervals along the outer wall circumference of the movable brake disc, and one end of the flyweight is rotatably connected to the outer wall of the movable brake disc.

[0013] Preferably, the flyweight is L-shaped, and one end of the flyweight is rotatably connected to the outer wall of the movable brake disc.

[0014] Preferably, a pulley is installed at the bent portion of the flyweight.

[0015] Preferably, mounting grooves adapted to the limiting springs are formed on the sides of the static brake disc and the moving brake disc that are close to each other.

[0016] Preferably, one end of the roller shaft is connected to the rotor blade of the wind turbine.

[0017] (III) Advantageous Effects

[0018] The advantageous effects of the present utility model are as follows: By adopting the above technical solution, under the action of the limiting spring, a distance is maintained between the static brake disc and the moving brake disc, which does not affect the normal rotation of the roller shaft. When the rotation speed of the roller shaft exceeds the threshold range, the flyweight deflects outward under the action of centrifugal force, and the bent portion of the flyweight contacts the limiting wheel, and drives the moving brake disc away from the limiting wheel and towards one end in the direction of the static brake disc. Under the action of the brake pads, deceleration of the roller shaft is achieved. This application realizes automatic deceleration when the roller shaft rotates at an excessive speed, avoiding the problem of overspeed of the rotor of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an overspeed brake based on a wind turbine Figure 1 ;

[0020] Figure 2 It is a schematic structural diagram of an overspeed brake based on a wind turbine Figure 2 ;

[0021] Figure 3 It is a schematic installation structure diagram of the moving brake disc.

[0022]

Description of the Reference Numerals

[0023] 1. Sleeve;

[0024] 2. Roller shaft;

[0025] 3. Static brake disc;

[0026] 4. Moving brake disc;

[0027] 5. Brake pad;

[0028] 6. Limiting spring;

[0029] 7. Flyweight;

[0030] 8. Pulley;

[0031] 9. Limiting wheel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To better explain the present utility model for easier understanding, the present utility model will be described in detail below with reference to the accompanying drawings and through specific embodiments.

[0033] Please refer to Figures 1 to 3 , the present utility model provides an overspeed brake based on a wind turbine, including a roller shaft 2, a shaft sleeve 1, a stationary brake disc 3, a moving brake disc 4, brake pads 5, a limiting spring 6, a limiting wheel 9, and a flyweight 7;

[0034] The roller shaft 2 is installed in the shaft sleeve 1 through a bearing;

[0035] The stationary brake disc 3 is fixedly installed on the surface of the shaft sleeve 1;

[0036] The moving brake disc 4 is installed on the roller shaft 2 by a spline connection method, and the stationary brake disc 3 is arranged at intervals. The limiting spring 6 is installed between the moving brake disc 4 and the stationary brake disc 3. Brake pads 5 are arranged on both sides of the moving brake disc 4 and the stationary brake disc 3 that are close to each other;

[0037] The limiting wheel 9 is fixed on the roller shaft 2 and is arranged on the side of the moving brake disc 4 away from the stationary brake disc 3;

[0038] A plurality of groups of flyweights 7 are provided, which are circumferentially and equally angularly spaced along the outer wall of the moving brake disc 4. One end of the flyweight 7 is rotatably connected to the outer wall of the moving brake disc 4.

[0039] In this embodiment, the flyweight 7 is L-shaped, and one end of the flyweight 7 is rotatably connected to the outer wall of the moving brake disc 4.

[0040] In this embodiment, a pulley 8 is installed at the bent portion of the flyweight 7.

[0041] In this embodiment, mounting grooves adapted to the limiting spring 6 are provided on both sides of the stationary brake disc 3 and the moving brake disc 4 that are close to each other.

[0042] In this embodiment, one end of the roller shaft 2 is connected to the rotor blade of the wind turbine;

[0043] The working principle of the present utility model is as follows:

[0044] Under the action of the limiting spring 6, a distance is maintained between the stationary brake disc 3 and the moving brake disc 4, which does not affect the normal rotation of the roller shaft 2. When the rotation speed of the roller shaft 2 exceeds the threshold range, the flyweight 7 deflects outward under the action of centrifugal force, and the bent portion of the flyweight 7 contacts the limiting wheel 9, driving the moving brake disc 4 away from the limiting wheel 9 and towards the stationary brake disc 3. Under the action of the brake pads 5, deceleration of the roller shaft 2 is achieved. This application realizes automatic deceleration when the roller shaft 2 rotates at an overspeed, avoiding the problem of overspeed of the wind turbine rotor.

[0045] The circuits, electronic components, and modules involved are all prior arts and can be fully implemented by those skilled in the art without further elaboration. The content protected by the present utility model also does not involve improvements to software and methods.

[0046] The above are only embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in the relevant technical fields, shall be similarly included in the patent protection scope of the present utility model.

[0047] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An overspeed brake based on a wind turbine, characterized in that: It includes a roller shaft, a shaft sleeve, a brake static disc, a brake dynamic disc, a brake pad, a limit spring, a limit wheel and a flyweight; The roller shaft is installed in the shaft sleeve through a bearing; The brake static disc is fixedly mounted on the surface of the shaft sleeve; The brake movable disc is installed on the roller shaft by a spline connection, and the brake static disc is arranged at intervals, the limit spring is installed between the brake movable disc and the brake static disc, and the brake pad is arranged on the side where the brake movable disc and the brake static disc are close to each other; The limiting wheel is fixed on the roller shaft and is arranged on a side of the brake movable disc away from the brake static disc; The flyweights are provided in multiple groups and are arranged at equal angles along the circumference of the outer wall of the brake rotor, and one end of the flyweight is rotatably connected to the outer wall of the brake rotor.

2. The overspeed brake based on a wind turbine according to claim 1, characterized in that: The flyweight is L-shaped, and one end of the flyweight is rotatably connected to the outer wall of the brake disc.

3. The overspeed brake based on a wind turbine according to claim 2, characterized in that: A pulley is installed at the bending position of the fly hammer.

4. The overspeed brake based on a wind turbine according to claim 1, characterized in that: The sides of the brake static disc and the brake dynamic disc close to each other are both provided with mounting grooves adapted to the limit spring.

5. The overspeed brake based on a wind turbine according to claim 1, characterized in that: One end of the roller shaft is connected to the rotor blade of the wind generator.

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