A blade emergency stop device for a wind turbine

Abstract

The invention discloses a blade emergency stop device for a wind turbine generator, comprising a rotating shaft and a shell, wherein the rotating shaft passes through the shell and is rotatably connected to the shell, a first deceleration braking mechanism and a second deceleration braking mechanism are arranged in the shell, the first deceleration braking mechanism comprises an electric hydraulic rod, a braking member and a braking ring, the braking member is connected to the free end of the electric hydraulic rod, the electric hydraulic rod is arranged in the circumference of the rotating shaft, the electric hydraulic rod and the braking ring are arranged at the same axial position, the second deceleration braking mechanism comprises a deceleration collar, the deceleration collar is arranged on the outside of the rotating shaft, a plurality of deceleration baffles are arranged around the inner side of the deceleration collar, the deceleration baffles are hinged to the deceleration collar, reset springs are arranged on both sides of the deceleration baffle, a plurality of impact deceleration blocks are arranged around the rotating shaft, and the deceleration collar is axially slidably connected to the shell; the problem of large wear generated when the blades of the wind turbine generator are emergency stopped, resulting in a short service life of the emergency stop equipment and low emergency stop efficiency is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of blade emergency stop, and in particular relates to a blade emergency stop device for a wind turbine generator. Background Art

[0002] A wind turbine is a device that converts wind energy into mechanical energy and then into electrical energy. When a wind turbine fails, the blades need to be stopped urgently before they can be inspected and repaired. Currently, the wind turbine blades suffer from great wear when they are stopped urgently, resulting in a short service life of the emergency stop equipment and low efficiency of the emergency stop. In order to solve this problem, a blade emergency stop device for a wind turbine is proposed. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a blade emergency stop device for a wind turbine, which solves the problem that the wind turbine blades are currently subjected to large wear during emergency stop, resulting in a short service life of the emergency stop equipment and low emergency stop efficiency.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a blade emergency stop device for a wind turbine, comprising a rotating shaft and a shell, the rotating shaft is arranged through the shell, and the rotating shaft is rotatably connected to the shell, the internal cavity of the shell is provided with a first deceleration braking mechanism and a second deceleration braking mechanism, the first deceleration braking mechanism comprises an electric hydraulic rod, a brake member and a brake ring, the brake ring is arranged on the outside of the rotating shaft, the brake member is connected to the free end of the electric hydraulic rod, the electric hydraulic rod is arranged in the circumference of the rotating shaft, the electric hydraulic rod and the brake ring are arranged at the same axial position, the second deceleration braking mechanism comprises a deceleration ring, the deceleration ring is arranged on the outside of the rotating shaft, a plurality of deceleration baffles are evenly arranged around the inner side of the deceleration ring, the deceleration baffles are hinged to the inner wall of the deceleration ring, reset springs are arranged on both sides of the deceleration baffle, a plurality of impact deceleration blocks are evenly arranged around the rotating shaft, and the deceleration ring is axially slidably connected to the shell.

[0005] An axial sliding structure is arranged on the inner wall of the shell, and the reduction sleeve is connected to the sliding end of the sliding structure.

[0006] A slide groove is provided axially on the inner wall of the shell, and a plurality of slide grooves are evenly arranged around the shell. A limit slider is slidably arranged in the slide groove. An electric telescopic rod is also arranged on the inner wall of the shell. The number of the electric telescopic rods is the same as the number of the slide grooves. The limit slider is connected to the free end of the electric telescopic rod, and the reduction sleeve is connected to the limit slider.

[0007] The axis of the electric telescopic rod is parallel to the moving direction of the limiting sliding block.

[0008] The first deceleration and braking mechanism is arranged at one end of the inner cavity of the shell away from the blades, and the second deceleration and braking mechanism is arranged at one end of the inner cavity of the shell close to the blades.

[0009] The number of impact deceleration blocks is the same as the number of deceleration baffles.

[0010] The electric hydraulic rod is arranged at one end of the inner wall of the shell away from the limiting sliding groove. At least two electric hydraulic rods are arranged, and the electric hydraulic rods are symmetrically distributed about the rotation axis.

[0011] The end surface of the brake member close to the brake ring is arc-shaped, and the curvature of the arc is the same as the curvature of the outer side of the brake ring.

[0012] A plurality of threaded holes are evenly arranged at both ends of the brake ring along the circumferential direction, and fastening bolts are arranged in the threaded holes.

[0013] The ends of the deceleration baffle and the impact deceleration block are rounded structures.

[0014] Compared with the prior art, the present invention has at least the following beneficial effects:

[0015] The present invention adopts the dual deceleration braking setting of the first deceleration braking mechanism and the second deceleration braking mechanism, so that the efficiency of the emergency stop of the wind turbine blades is higher. At the same time, the second deceleration braking mechanism is a buffer brake, which reduces the rotation speed of the rotating shaft by the resistance generated by the collision of the deceleration block and the deceleration baffle, thereby reducing the loss caused by the friction braking of the first deceleration braking mechanism and the rotating shaft. When braking is not required, the first deceleration braking mechanism and the second deceleration braking mechanism are in a non-working state. The structure has little impact on existing equipment and is suitable for the transformation of new equipment and old equipment. It effectively solves the problem that the wind turbine blades are currently subjected to large wear when they are urgently stopped, resulting in a short service life of the emergency stop equipment and low emergency stop efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0017] Figure 1 It is a side cross-sectional structural schematic diagram of a blade emergency stop device of a wind turbine generator according to the present invention;

[0018] Figure 2 A blade emergency stop device for a wind turbine generator according to the present invention Figure 1 Schematic diagram of the AA structure;

[0019] Figure 3 A blade emergency stop device for a wind turbine generator according to the present invention Figure 1 Schematic diagram of the BB structure;

[0020] Numbers in the figure: 1. Blade; 2. Rotating shaft; 3. Impact deceleration block; 4. Deceleration collar; 5. Limit slider; 6. Shell; 7. Fixed seat; 8. Limit slide groove; 9. Electric hydraulic rod; 10. Brake part; 11. Brake ring; 12. Deceleration baffle; 13. Reset spring; 14. Electric telescopic rod. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or connected or set in one piece; the models of electrical appliances provided in the present invention are for reference only. For ordinary technicians in this field, different models of electrical appliances with the same functions can be replaced according to actual usage conditions. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1-3 The present invention provides a technical solution: a blade emergency stop device for a wind turbine, comprising a rotating shaft 2 and a shell 6, a blade 1 is fixedly mounted on one end of the rotating shaft 2, and the blade 1 is distributed in a ring array about one end of the circumferential side wall of the rotating shaft 2, the rotating shaft 2 and the shell 6 are arranged through, and the rotating shaft 2 and the shell 6 are rotatably connected, and the internal cavity of the shell 6 is provided with a first deceleration braking mechanism and a second deceleration braking mechanism, the first deceleration braking mechanism comprises an electric hydraulic rod 9, a brake member 10 and a brake ring 11, and the second deceleration braking mechanism comprises an electric telescopic rod 14, a limiting slide groove 8, a limiting slider 5, a deceleration collar 4, a deceleration baffle 12, a reset spring 13 and an impact deceleration block 3.

[0025] In this embodiment, please refer to Figure 1 , Figure 2 and Figure 3The double deceleration braking arrangement of the first deceleration braking mechanism and the second deceleration braking mechanism makes the emergency stop efficiency of the wind turbine blade 1 higher. At the same time, the second deceleration braking mechanism is a buffer brake, which reduces the rotation speed of the rotating shaft 2 by the resistance generated by the collision between the deceleration block 3 and the deceleration baffle 12, thereby reducing the loss caused by the friction braking of the first deceleration braking mechanism, thereby increasing the service life of the emergency stop device.

[0026] An axial sliding structure is arranged on the inner wall of the shell 6, and the reduction ring 4 is connected to the sliding end of the sliding structure. Specifically and optionally: a slide groove 8 is arranged on the inner wall of the shell 6 along the axial direction, and a limit slider 5 is slidably arranged in the slide groove 8. An electric telescopic rod 14 is also arranged on the inner wall of the shell 6. The number of the electric telescopic rods 14 is the same as the number of the slide grooves 8. The limit slider 5 is connected to the free end of the electric telescopic rod 14; as a preferred embodiment, the axis of the electric telescopic rod 14 is parallel to the moving direction of the limit slider 5.

[0027] Of course, in order to avoid the influence of the slide groove 8 in the shell 6 on its strength, the effective volume of the shell 6 can be increased, a slide rail is set on the inner wall surface of the shell 6, a slider is slidably set on the slide rail, and the slider is connected to the free end of the electric telescopic rod 14.

[0028] In order to reduce the influence of the huge impact of the instantaneous collision between the deceleration baffle 12 and the impact deceleration block 3 on both, the ends of the deceleration baffle 12 and the impact deceleration block 3 are rounded transition processed, which can also increase the contact time between the two and improve braking efficiency.

[0029] A fixing seat 7 is provided at the top of the shell 6, and the fixing seat 7 is distributed in a rectangular array at the top of the shell 6. The first deceleration and braking mechanism is provided at one end of the internal cavity of the shell 6 away from the blade 1, and the second deceleration and braking mechanism is provided at one end of the internal cavity of the shell 6 close to the blade 1. The limiting slide groove 8 is opened on the inner wall of the shell 6, and the limiting slide groove 8 is distributed in a ring array with respect to the inner wall of the shell 6. One end of the electric telescopic rod 14 is fixedly installed at one end of the inner wall of the limiting slide groove 8, and the other end of the electric telescopic rod 14 is fixedly connected to the limiting slider 5. The deceleration ring 4 is sleeved with the rotating shaft 2, and the deceleration baffle 12 is rotatably installed on the circumferential inner wall of the deceleration ring 4, and the deceleration baffle 12 is distributed in a ring array with respect to the circumferential inner wall of the deceleration ring 4. Reset springs 13 are provided on both sides of the deceleration baffle 12, and The other end of the return spring 13 is fixedly connected to the inner wall of the reduction collar 4, the impact reduction block 3 is arranged on the circumferential side wall of the rotating shaft 2, and the impact reduction block 3 is distributed in a ring array about the circumferential side wall of the rotating shaft 2, the impact reduction block 3 and the reduction baffle 12 are matched with the collision reduction setting, the limit slider 5 is arranged on the circumferential outer wall of the reduction collar 4, and the limit slider 5 is distributed in a ring array about the circumferential outer wall of the reduction collar 4, the limit slider 5 and the limit slide groove 8 are slidably installed, the electric hydraulic rod 9 is arranged on the end of the inner wall of the shell 6 away from the limit slide groove 8, and the electric hydraulic rod 9 is symmetrically distributed about the upper and lower ends of the inner wall of the shell 6, the brake ring 11 is fixedly installed on the circumferential side wall of the rotating shaft 2, the brake member 10 is fixedly connected to one end of the electric hydraulic rod 9, and the brake member 10 and the brake ring 11 are matched with each other in a braking setting.

[0030] Working principle: The rotating shaft 2 is braked and decelerated by the first deceleration braking mechanism and the second deceleration braking mechanism, so as to achieve the emergency stop purpose of the blade 1. The operation steps are: start the electric hydraulic rod 9 and the electric telescopic rod 14. The two sets of electric hydraulic rods 9 push the brake member 10 to clamp the brake ring 11 that presses the circumferential side wall of the rotating shaft 2. The rotation speed of the rotating shaft 2 is reduced by the friction between the brake member 10 and the brake ring 11. The electric telescopic rod 14 pushes the limit slider 5 to move in the limit slide groove 8, so that the deceleration ring 4 and the impact deceleration block 3 are in the same plane. When the rotating shaft 2 rotates, it drives the impact deceleration block 3 to impact the deceleration baffle 12, and then resets it through the reset spring 13. The rotation speed of the rotating shaft 2 is reduced by the resistance generated by frequent impacts. The rotating shaft 2 is decelerated to a stop by the double braking of the impact resistance and the friction resistance, thereby achieving the emergency stop purpose of the blade 1.

[0031] As a preferred embodiment, in order to avoid opening holes on the rotating shaft 2, a number of threaded holes are evenly opened at both ends of the brake ring 11 along the circumferential direction, and fastening bolts are arranged in the threaded holes. The brake ring 11 is fastened to the rotating shaft by the fastening bolts to prevent the holes in the rotating shaft from reducing its strength, and the brake ring 11 is also easy to replace.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A blade emergency stop device for a wind turbine, characterized in that: The invention comprises a rotating shaft (2) and a housing (6), wherein the rotating shaft (2) passes through the housing (6) and is rotatably connected to the housing (6), wherein a first deceleration braking mechanism and a second deceleration braking mechanism are arranged in an internal cavity of the housing (6), wherein the first deceleration braking mechanism comprises an electric hydraulic rod (9), a brake member (10) and a brake ring (11), wherein the brake ring (11) is arranged on the outside of the rotating shaft (2), wherein the brake member (10) is connected to the free end of the electric hydraulic rod (9), wherein the electric hydraulic rod (9) is arranged in the circumferential direction of the rotating shaft (2), wherein the electric hydraulic rod (9) and the brake ring (11) are arranged at the same axial position, and wherein the second deceleration braking mechanism comprises a deceleration collar (4), wherein the deceleration collar (4) is arranged on the outside of the rotating shaft (2), wherein a plurality of deceleration baffles (12) are evenly arranged on the inner side of the deceleration collar (4), wherein the deceleration baffles (12) are hingedly connected to the inner wall of the deceleration collar (4), and wherein the deceleration baffles (12) are hingedly connected to the inner wall of the deceleration collar (4). A return spring (13) is arranged on both sides of the plate (12); a plurality of impact deceleration blocks (3) are evenly arranged around the rotating shaft (2); the deceleration ring (4) is axially slidably connected to the housing (6); an axial sliding structure is arranged on the inner wall of the housing (6); the deceleration ring (4) is connected to the sliding end of the sliding structure; a sliding groove (8) is axially arranged on the inner wall of the housing (6); a plurality of sliding grooves (8) are evenly arranged around the housing (6); a limit slider (5) is slidably arranged in the sliding groove (8); an electric telescopic rod (14) is also arranged on the inner wall of the housing (6); the number of the electric telescopic rod (14) is the same as the number of the sliding grooves (8); the limit slider (5) is connected to the free end of the electric telescopic rod (14); the deceleration ring (4) is connected to the limit slider (5); the axis of the electric telescopic rod (14) is parallel to the moving direction of the limit slider (5); the number of the impact deceleration blocks (3) is the same as the number of the deceleration baffle (12).

2. The blade emergency stop device of a wind turbine according to claim 1, characterized in that: The first deceleration and braking mechanism is arranged at an end of the internal cavity of the shell (6) away from the blade (1), and the second deceleration and braking mechanism is arranged at an end of the internal cavity of the shell (6) close to the blade (1).

3. The blade emergency stop device of a wind turbine according to claim 1, characterized in that: The electric hydraulic rod (9) is arranged at one end of the inner wall of the housing (6) away from the limiting sliding groove (8), at least two electric hydraulic rods (9) are arranged, and the electric hydraulic rods (9) are axially symmetrically distributed about the rotation axis (2).

4. The wind turbine blade emergency stop device according to claim 1, characterized in that: The end surface of the brake member (10) close to the brake ring (11) is arc-shaped, and the curvature of the arc is the same as the curvature of the outer side of the brake ring (11).

5. The wind turbine blade emergency stop device according to claim 1, characterized in that: A plurality of threaded holes are evenly arranged at both ends of the brake ring (11) along the circumferential direction, and fastening bolts are arranged in the threaded holes.

6. The wind turbine blade emergency stop device according to claim 1, characterized in that: The ends of the deceleration baffle (12) and the impact deceleration block (3) are rounded structures.

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