Device and method for slowing down the falling of blade tip extension section

Abstract

The present invention relates to the field of wind power generation, and in particular to a device and method for slowing down the falling of a blade tip extension section. The device comprises a parachute, and the parachute comprises a parachute body, a trigger pull rope and a parachute rope, wherein the parachute body is respectively connected to the trigger pull rope and the parachute rope; the parachute is respectively arranged on the inner surfaces of the pressure surface and the suction surface of the blade tip extension section; the trigger pull rope of the parachute is bonded to the original blade where the blade tip extension section is located, and the parachute rope is connected to the blade tip extension section. By installing a parachute in the blade tip extension section, the injury or safety risk when the blade tip extension section falls is effectively reduced; by installing a voice warning prompt device in the blade tip extension section, a reminder and warning function is achieved, thereby reducing the risk.

Description

Technical Field

[0001] The invention relates to the field of wind power generation, and in particular to a device and method for slowing down the falling of a blade tip extension section. Background Art

[0002] With the development of large-scale wind turbines, the blade diameter of early wind turbines was relatively short due to industry development restrictions and backward technology. With the addition of a large number of wind farms in recent years and the trend of gradually decreasing actual wind speeds in nature, the actual operating wind speeds of early wind farms were lower than the original feasibility study design wind speeds, and the wind capture capabilities decreased to varying degrees.

[0003] At present, the industry mostly adopts the method of increasing the swept area of ​​the impeller to improve the insufficient wind-catching capacity caused by short blades. Common methods include replacing small blades with large blades, extending the blade root section, extending the blade tip section, etc. Considering the economy, feasibility, safety, construction characteristics and other aspects, the method of extending the blade tip has become one of the current hot spots. Extending the blade tip has the advantages of further optimizing the aerodynamic shape of the original blade, no need for hoisting, and good economy.

[0004] The blade tip extension section is generally connected to the original blade by means of structural adhesive bonding. The bonding strength of the structural adhesive is closely related to factors such as the construction quality, process, ambient temperature, humidity, wind speed, etc. of the construction personnel. During the operation of the unit, there is a risk of the blade tip extension section falling off, which may easily cause harm to personnel, animals, etc. around the unit. Summary of the invention

[0005] In view of the problem that the blade tip extension section may easily cause harm to surrounding personnel, animals, etc. after it falls off, the present invention proposes a device and method for slowing down the falling of the blade tip extension section.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] A device for slowing down the fall of a blade tip extension section, comprising: a parachute,

[0008] The parachute comprises a parachute body, a trigger pull rope and a parachute rope, and the parachute body is connected to the trigger pull rope and the parachute rope respectively;

[0009] The parachute is respectively arranged on the inner surfaces of the pressure surface and the suction surface of the blade tip extension section; the triggering rope of the parachute is bonded to the original blade where the blade tip extension section is located, and the parachute rope is connected to the blade tip extension section.

[0010] Furthermore, the aerodynamic drag of the parachute is greater than the impact force generated by the blade tip extension section falling at the minimum falling speed.

[0011] Furthermore, the parachute is divided into a suction surface parachute and a pressure surface parachute; the length of the parachute rope of the pressure surface parachute is 1.5-2 times the length of the parachute rope of the suction surface parachute.

[0012] Furthermore, it also includes an alarm device, which is arranged on the inner surfaces of the pressure surface and the suction surface of the blade tip extension section; the trigger pull rope is connected to the switch of the alarm device.

[0013] Furthermore, the alarm device is an audible and visual alarm.

[0014] Furthermore, the length of the trigger pull rope is less than the maximum parachute opening length L m , L m =gt 2 / 2, where g represents the acceleration of gravity and t is the time from the parachute being triggered to fully opening;

[0015] The length of the trigger rope is greater than the safety length Δx, Δx=k*(x1-x2), x1 represents the maximum deformation of the blade cross-section where the trigger rope is connected to the parachute under all operating conditions, x2 represents the maximum deformation of the trigger rope and the original blade bonding position under all operating conditions, k represents the rope length control safety factor, k=1.2~1.35.

[0016] Furthermore, the umbrella body is a round umbrella or a wing umbrella.

[0017] Furthermore, the trigger pull rope is sleeved with a catheter, the catheter is T-shaped, and is provided with a first catheter port, a second catheter port and a third catheter port. The first end of the trigger pull rope passes through the first catheter port and is bonded to the original blade; the second end of the trigger pull rope is divided into a first branch rope and a second branch rope, the first branch rope passes through the second catheter port and is connected to the parachute; the second branch rope of the trigger pull rope passes through the third catheter port and is connected to the switch of the alarm device.

[0018] Furthermore, the trigger pull rope is a wide flat rope.

[0019] A method for slowing down the drop of a blade tip extension node, comprising:

[0020] A parachute is provided on each inner surface of the pressure surface and the suction surface of the blade tip extension section;

[0021] The trigger rope of the parachute is bonded to the original blade where the blade tip extension section is located;

[0022] When the blade tip extension section falls off, the trigger rope is separated from the parachute and alarm on the extension section, the parachute opens, and the alarm sounds.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] First, by installing a parachute inside the blade tip extension section, the injury or safety risk when the blade tip extension section falls can be effectively reduced.

[0025] Second, by installing a voice warning device in the blade tip extension section, a reminder and warning function can be achieved to reduce risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Description of the drawings:

[0029] Figure 1 This is a schematic diagram of a device for slowing down the falling of a blade tip extension section according to the present invention;

[0030] Figure 2 This is a cross-sectional view of a device for slowing down the falling of a blade tip extension section of the present invention;

[0031] Figure 3 A schematic diagram of a parachute rope of a device for slowing down the falling of a blade tip extension section according to the present invention;

[0032] Figure 4 This is a schematic diagram of a guide tube of a device for slowing down the falling of a blade tip extension section of the present invention;

[0033] Figure 5 Schematic diagram of the clearance height of the original blade tip from the ground.

[0034] In the figure: 1. parachute; 2. alarm device; 3. trigger pull rope; 4. guide tube; 5. blade tip extension section bonding and fixing area; 6. wide flat belt; 7. parachute rope; 11. suction surface parachute; 12. pressure surface parachute; 41. first port of guide tube; 42. second port of guide tube; 43. third port of guide tube; h is the clearance height of the original blade tip from the ground. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0036] The following detailed description is an exemplary description, which is intended to provide further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0037] Example 1

[0038] The blade tip extension section is generally bonded to the outer surface of the original blade by molding the pressure surface and the suction surface together, or connected to the original blade by staggered bonding or infusion of glass fiber cloth. When the blade tip extension section falls, it may disintegrate in the air, that is, the pressure surface and suction surface shells are separated or fall off as a whole.

[0039] The pressure surface is the windward SS surface, and the suction surface is the leeward PS surface.

[0040] In order to prevent the blade tip from falling and injuring people or animals due to centrifugal force, rotation linear speed, gravity and other reasons, this embodiment proposes a warning device for slowing down the falling of the blade tip extension section, including: a parachute and an alarm device 2.

[0041] A parachute is provided on the inner surface of the pressure surface and the suction surface of the blade tip extension section;

[0042] The parachute comprises a parachute body 1, a trigger pull cord 3 and parachute ropes 7. The parachute body 1 is connected to the trigger pull cord 3 and the parachute ropes 7 respectively. When the trigger pull cord 3 is pulled, the parachute body 1 is opened.

[0043] The trigger rope 3 of the parachute is bonded to the original blade;

[0044] The design specifications of the parachute should be sufficient to reduce the speed of the blade tip extension when it falls, so that the blade tip falls slowly to the ground. The minimum falling speed of the blade tip extension is the linear speed of the blade tip falling position when the wind turbine rotates at the rated speed, that is, the aerodynamic resistance of the parachute is greater than the impact force generated by the blade tip extension falling at the minimum falling speed;

[0045] The blade tip extension section is also equipped with an alarm device 2, and the trigger pull rope 3 is connected to the switch of the alarm device 2. When the parachute is triggered, the trigger pull rope 3 synchronously triggers the switch of the alarm device 2, and the alarm device 2 emits a high-altitude falling object warning sound, such as a voice prompt, etc.;

[0046] The alarm device 2 and the parachute can be on both sides of the blade tip extension section web, or on the same side;

[0047] The suction parachute 11 and the pressure parachute 12 preset on the pressure side and the suction side have respective parachute rope lengths of L1 and L2 after opening, wherein L1 is 1.5-2 times of L2, to ensure that there is no interference when the two parachutes are opened at the same time, and they are fixed inside the shell in an easy-to-tie form;

[0048] Due to the narrow space in the blade tip extension section, the lengths of the trigger ropes 3 of the parachutes are different, but they can be the same when there is enough space;

[0049] In order to enable the parachute to be opened along the opening direction of the blade tip extension cavity, the trigger pull rope 3 is sleeved with a conduit 4, the conduit 4 is T-shaped, and is provided with a first conduit port 41, a second conduit port 42, and a third conduit port 43. The first end of the trigger pull rope 3 passes through the first conduit port 41 and is bonded to the original blade; the second end of the trigger pull rope 3 is divided into a first branch rope and a second branch rope, the first branch rope passes through the second conduit port 42 and is connected to the parachute; the second branch rope of the trigger pull rope 3 passes through the third conduit port 43 and is connected to the switch of the alarm device 2;

[0050] The trigger rope 3 is bonded to the outer surface or the inner surface or both of the inner surface and the inner surface of the suction surface of the blade tip together with the inner surface of the pressure surface of the blade tip. When the blade tip falls, it should be ensured that the trigger rope 3 does not break or separate from the original blade under the action of the bonding force, which is sufficient to open the parachute;

[0051] In order to enhance the bonding effect, the trigger rope 3 and the blade tip extension section bonding and fixing area 5 are bonded with a wide flat tape 6 .

[0052] The parachute body 1 can be a round parachute or a wing parachute.

[0053] The parachute has at least 4 parachute cords 7.

[0054] The length L of the trigger rope 3 should be greater than the safety length Δx, that is, L>Δx, Δx=k*(x1-x2), x1 represents the maximum deformation of the blade cross section where the trigger rope is connected to the parachute under all operating conditions, x2 represents the maximum deformation of the trigger rope and the original blade bonding position (near the blade tip side) under all operating conditions, k represents the rope length control safety factor, k=1.2~1.35. The purpose of setting L>Δx is to prevent the parachute from opening by mistake due to excessive deformation of the blade itself during the operation of the blade.

[0055] like Figure 5 As shown, the clearance height of the original blade tip from the ground is h, and the time from the triggering to the full opening of the parachute is t. Where g represents the acceleration of gravity, and the maximum parachute length L is obtained m =gt 2 / 2.

[0056] Method Example 2

[0057] By installing an alarm device 2 with a parachute and voice warning prompt function in the blade tip extension section, the injury or safety risk when the blade tip extension section falls can be effectively reduced. At the same time, the warning voice can also serve as a reminder and warning to reduce the risk.

[0058] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for slowing down the falling of blade tip extension section, characterized in that: include: parachute, The parachute comprises a parachute body (1), a trigger pull cord (3) and parachute cords (7), and the parachute body (1) is connected to the trigger pull cord (3) and the parachute cords (7) respectively; The parachute is respectively arranged on the inner surfaces of the pressure surface and the suction surface of the blade tip extension section; the trigger pull rope (3) of the parachute is bonded to the original blade where the blade tip extension section is located, and the parachute rope (7) is connected to the blade tip extension section; The length of the trigger pull rope (3) is less than the maximum parachute opening length L m , L m =gt 2 / 2, where g represents the acceleration of gravity and t is the time from the parachute being triggered to fully opening; The length of the trigger rope (3) is greater than the safety length Δx, Δx=k*(x1-x2), x1 represents the maximum deformation of the blade cross section where the trigger rope (3) is connected to the parachute under all operating conditions, x2 represents the maximum deformation of the trigger rope (3) and the original blade bonding position under all operating conditions, k represents the rope length control safety factor, k=1.2~1.35; It also comprises an alarm device (2), the alarm device (2) being arranged on the inner surfaces of the pressure surface and the suction surface of the blade tip extension section; the trigger pull rope (3) is connected to the switch of the alarm device (2).

2. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The aerodynamic drag of the parachute is greater than the impact force generated by the blade tip extension section falling at the minimum falling speed.

3. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The parachutes are divided into a suction surface parachute (11) and a pressure surface parachute (12); the length of the parachute rope (7) of the pressure surface parachute (12) is 1.5 to 2 times the length of the parachute rope (7) of the suction surface parachute (11).

4. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The alarm device (2) is an audible and visual alarm.

5. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The umbrella body (1) is a round umbrella or a wing umbrella.

6. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The trigger pull rope (3) is sleeved with a catheter (4), the catheter (4) is T-shaped and is provided with a first catheter port (41), a second catheter port (42) and a third catheter port (43); the first end of the trigger pull rope (3) passes through the first catheter port (41) and is bonded to the original blade; the second end of the trigger pull rope (3) is divided into a first branch rope and a second branch rope, the first branch rope passes through the second catheter port (42) and is connected to the parachute; the second branch rope of the trigger pull rope (3) passes through the third catheter port (43) and is connected to the switch of the alarm device (2).

7. The device for slowing down the falling of blade tip extension section according to claim 1, characterized in that: The trigger pull rope (3) is a wide flat rope.

8. A method for slowing down the falling of a blade tip extension section, which is realized based on the device for slowing down the falling of a blade tip extension section according to claim 1, characterized in that: include: A parachute is provided on each inner surface of the pressure surface and the suction surface of the blade tip extension section; The trigger pull rope (3) of the parachute is bonded to the original blade where the blade tip extension section is located; When the blade tip extension section falls off, the trigger rope is separated from the parachute and alarm on the extension section, the parachute opens, and the alarm sounds.

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